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
 809 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
 810 {
 811         memcpy(v, b, sizeof(*b));
 812 }
 813
 814 /* All VF info */
 815 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 816                                    u32 ext_filter_mask)
 817 {
 818         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 819             (ext_filter_mask & RTEXT_FILTER_VF)) {
 820                 int num_vfs = dev_num_vf(dev->dev.parent);
 821                 size_t size = nla_total_size(sizeof(struct nlattr));
 822                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 823                 size += num_vfs *
 824                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 825                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 826                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 827                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 828                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 829                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 830                          /* IFLA_VF_STATS_RX_PACKETS */
 831                          nla_total_size(sizeof(__u64)) +
 832                          /* IFLA_VF_STATS_TX_PACKETS */
 833                          nla_total_size(sizeof(__u64)) +
 834                          /* IFLA_VF_STATS_RX_BYTES */
 835                          nla_total_size(sizeof(__u64)) +
 836                          /* IFLA_VF_STATS_TX_BYTES */
 837                          nla_total_size(sizeof(__u64)) +
 838                          /* IFLA_VF_STATS_BROADCAST */
 839                          nla_total_size(sizeof(__u64)) +
 840                          /* IFLA_VF_STATS_MULTICAST */
 841                          nla_total_size(sizeof(__u64)) +
 842                          nla_total_size(sizeof(struct ifla_vf_trust)));
 843                 return size;
 844         } else
 845                 return 0;
 846 }
 847
 848 static size_t rtnl_port_size(const struct net_device *dev,
 849                              u32 ext_filter_mask)
 850 {
 851         size_t port_size = nla_total_size(4)            /* PORT_VF */
 852                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 853                 + nla_total_size(sizeof(struct ifla_port_vsi))
 854                                                         /* PORT_VSI_TYPE */
 855                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 856                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 857                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 858                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 859         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 860         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 861                 + port_size;
 862         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 863                 + port_size;
 864
 865         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 866             !(ext_filter_mask & RTEXT_FILTER_VF))
 867                 return 0;
 868         if (dev_num_vf(dev->dev.parent))
 869                 return port_self_size + vf_ports_size +
 870                         vf_port_size * dev_num_vf(dev->dev.parent);
 871         else
 872                 return port_self_size;
 873 }
 874
 875 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 876                                      u32 ext_filter_mask)
 877 {
 878         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 879                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 880                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 881                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 882                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 883                + nla_total_size(sizeof(struct rtnl_link_stats))
 884                + nla_total_size(sizeof(struct rtnl_link_stats64))
 885                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 886                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 887                + nla_total_size(4) /* IFLA_TXQLEN */
 888                + nla_total_size(4) /* IFLA_WEIGHT */
 889                + nla_total_size(4) /* IFLA_MTU */
 890                + nla_total_size(4) /* IFLA_LINK */
 891                + nla_total_size(4) /* IFLA_MASTER */
 892                + nla_total_size(1) /* IFLA_CARRIER */
 893                + nla_total_size(4) /* IFLA_PROMISCUITY */
 894                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 895                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 896                + nla_total_size(1) /* IFLA_OPERSTATE */
 897                + nla_total_size(1) /* IFLA_LINKMODE */
 898                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
 899                + nla_total_size(4) /* IFLA_LINK_NETNSID */
 900                + nla_total_size(ext_filter_mask
 901                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 902                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 903                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 904                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 905                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
 906                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
 907                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
 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                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1031                 .flags = SWITCHDEV_F_NO_RECURSE,
1032         };
1033
1034         err = switchdev_port_attr_get(dev, &attr);
1035         if (err) {
1036                 if (err == -EOPNOTSUPP)
1037                         return 0;
1038                 return err;
1039         }
1040
1041         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1042                     attr.u.ppid.id))
1043                 return -EMSGSIZE;
1044
1045         return 0;
1046 }
1047
1048 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1049                             int type, u32 pid, u32 seq, u32 change,
1050                             unsigned int flags, u32 ext_filter_mask)
1051 {
1052         struct ifinfomsg *ifm;
1053         struct nlmsghdr *nlh;
1054         struct rtnl_link_stats64 temp;
1055         const struct rtnl_link_stats64 *stats;
1056         struct nlattr *attr, *af_spec;
1057         struct rtnl_af_ops *af_ops;
1058         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1059
1060         ASSERT_RTNL();
1061         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1062         if (nlh == NULL)
1063                 return -EMSGSIZE;
1064
1065         ifm = nlmsg_data(nlh);
1066         ifm->ifi_family = AF_UNSPEC;
1067         ifm->__ifi_pad = 0;
1068         ifm->ifi_type = dev->type;
1069         ifm->ifi_index = dev->ifindex;
1070         ifm->ifi_flags = dev_get_flags(dev);
1071         ifm->ifi_change = change;
1072
1073         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1074             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1075             nla_put_u8(skb, IFLA_OPERSTATE,
1076                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1077             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1078             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1079             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1080             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1081             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1082 #ifdef CONFIG_RPS
1083             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1084 #endif
1085             (dev->ifindex != dev_get_iflink(dev) &&
1086              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1087             (upper_dev &&
1088              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1089             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1090             (dev->qdisc &&
1091              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1092             (dev->ifalias &&
1093              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1094             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1095                         atomic_read(&dev->carrier_changes)) ||
1096             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1097                 goto nla_put_failure;
1098
1099         if (1) {
1100                 struct rtnl_link_ifmap map = {
1101                         .mem_start   = dev->mem_start,
1102                         .mem_end     = dev->mem_end,
1103                         .base_addr   = dev->base_addr,
1104                         .irq         = dev->irq,
1105                         .dma         = dev->dma,
1106                         .port        = dev->if_port,
1107                 };
1108                 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1109                         goto nla_put_failure;
1110         }
1111
1112         if (dev->addr_len) {
1113                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1114                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1115                         goto nla_put_failure;
1116         }
1117
1118         if (rtnl_phys_port_id_fill(skb, dev))
1119                 goto nla_put_failure;
1120
1121         if (rtnl_phys_port_name_fill(skb, dev))
1122                 goto nla_put_failure;
1123
1124         if (rtnl_phys_switch_id_fill(skb, dev))
1125                 goto nla_put_failure;
1126
1127         attr = nla_reserve(skb, IFLA_STATS,
1128                         sizeof(struct rtnl_link_stats));
1129         if (attr == NULL)
1130                 goto nla_put_failure;
1131
1132         stats = dev_get_stats(dev, &temp);
1133         copy_rtnl_link_stats(nla_data(attr), stats);
1134
1135         attr = nla_reserve(skb, IFLA_STATS64,
1136                         sizeof(struct rtnl_link_stats64));
1137         if (attr == NULL)
1138                 goto nla_put_failure;
1139         copy_rtnl_link_stats64(nla_data(attr), stats);
1140
1141         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1142             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1143                 goto nla_put_failure;
1144
1145         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1146             && (ext_filter_mask & RTEXT_FILTER_VF)) {
1147                 int i;
1148
1149                 struct nlattr *vfinfo, *vf, *vfstats;
1150                 int num_vfs = dev_num_vf(dev->dev.parent);
1151
1152                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1153                 if (!vfinfo)
1154                         goto nla_put_failure;
1155                 for (i = 0; i < num_vfs; i++) {
1156                         struct ifla_vf_info ivi;
1157                         struct ifla_vf_mac vf_mac;
1158                         struct ifla_vf_vlan vf_vlan;
1159                         struct ifla_vf_rate vf_rate;
1160                         struct ifla_vf_tx_rate vf_tx_rate;
1161                         struct ifla_vf_spoofchk vf_spoofchk;
1162                         struct ifla_vf_link_state vf_linkstate;
1163                         struct ifla_vf_rss_query_en vf_rss_query_en;
1164                         struct ifla_vf_stats vf_stats;
1165                         struct ifla_vf_trust vf_trust;
1166
1167                         /*
1168                          * Not all SR-IOV capable drivers support the
1169                          * spoofcheck and "RSS query enable" query.  Preset to
1170                          * -1 so the user space tool can detect that the driver
1171                          * didn't report anything.
1172                          */
1173                         ivi.spoofchk = -1;
1174                         ivi.rss_query_en = -1;
1175                         ivi.trusted = -1;
1176                         memset(ivi.mac, 0, sizeof(ivi.mac));
1177                         /* The default value for VF link state is "auto"
1178                          * IFLA_VF_LINK_STATE_AUTO which equals zero
1179                          */
1180                         ivi.linkstate = 0;
1181                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1182                                 break;
1183                         vf_mac.vf =
1184                                 vf_vlan.vf =
1185                                 vf_rate.vf =
1186                                 vf_tx_rate.vf =
1187                                 vf_spoofchk.vf =
1188                                 vf_linkstate.vf =
1189                                 vf_rss_query_en.vf =
1190                                 vf_trust.vf = ivi.vf;
1191
1192                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1193                         vf_vlan.vlan = ivi.vlan;
1194                         vf_vlan.qos = ivi.qos;
1195                         vf_tx_rate.rate = ivi.max_tx_rate;
1196                         vf_rate.min_tx_rate = ivi.min_tx_rate;
1197                         vf_rate.max_tx_rate = ivi.max_tx_rate;
1198                         vf_spoofchk.setting = ivi.spoofchk;
1199                         vf_linkstate.link_state = ivi.linkstate;
1200                         vf_rss_query_en.setting = ivi.rss_query_en;
1201                         vf_trust.setting = ivi.trusted;
1202                         vf = nla_nest_start(skb, IFLA_VF_INFO);
1203                         if (!vf) {
1204                                 nla_nest_cancel(skb, vfinfo);
1205                                 goto nla_put_failure;
1206                         }
1207                         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1208                             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1209                             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1210                                     &vf_rate) ||
1211                             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1212                                     &vf_tx_rate) ||
1213                             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1214                                     &vf_spoofchk) ||
1215                             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1216                                     &vf_linkstate) ||
1217                             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1218                                     sizeof(vf_rss_query_en),
1219                                     &vf_rss_query_en) ||
1220                             nla_put(skb, IFLA_VF_TRUST,
1221                                     sizeof(vf_trust), &vf_trust))
1222                                 goto nla_put_failure;
1223                         memset(&vf_stats, 0, sizeof(vf_stats));
1224                         if (dev->netdev_ops->ndo_get_vf_stats)
1225                                 dev->netdev_ops->ndo_get_vf_stats(dev, i,
1226                                                                   &vf_stats);
1227                         vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1228                         if (!vfstats) {
1229                                 nla_nest_cancel(skb, vf);
1230                                 nla_nest_cancel(skb, vfinfo);
1231                                 goto nla_put_failure;
1232                         }
1233                         if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS,
1234                                         vf_stats.rx_packets) ||
1235                             nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS,
1236                                         vf_stats.tx_packets) ||
1237                             nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES,
1238                                         vf_stats.rx_bytes) ||
1239                             nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES,
1240                                         vf_stats.tx_bytes) ||
1241                             nla_put_u64(skb, IFLA_VF_STATS_BROADCAST,
1242                                         vf_stats.broadcast) ||
1243                             nla_put_u64(skb, IFLA_VF_STATS_MULTICAST,
1244                                         vf_stats.multicast))
1245                                 goto nla_put_failure;
1246                         nla_nest_end(skb, vfstats);
1247                         nla_nest_end(skb, vf);
1248                 }
1249                 nla_nest_end(skb, vfinfo);
1250         }
1251
1252         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1253                 goto nla_put_failure;
1254
1255         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1256                 if (rtnl_link_fill(skb, dev) < 0)
1257                         goto nla_put_failure;
1258         }
1259
1260         if (dev->rtnl_link_ops &&
1261             dev->rtnl_link_ops->get_link_net) {
1262                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1263
1264                 if (!net_eq(dev_net(dev), link_net)) {
1265                         int id = peernet2id_alloc(dev_net(dev), link_net);
1266
1267                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1268                                 goto nla_put_failure;
1269                 }
1270         }
1271
1272         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1273                 goto nla_put_failure;
1274
1275         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1276                 if (af_ops->fill_link_af) {
1277                         struct nlattr *af;
1278                         int err;
1279
1280                         if (!(af = nla_nest_start(skb, af_ops->family)))
1281                                 goto nla_put_failure;
1282
1283                         err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1284
1285                         /*
1286                          * Caller may return ENODATA to indicate that there
1287                          * was no data to be dumped. This is not an error, it
1288                          * means we should trim the attribute header and
1289                          * continue.
1290                          */
1291                         if (err == -ENODATA)
1292                                 nla_nest_cancel(skb, af);
1293                         else if (err < 0)
1294                                 goto nla_put_failure;
1295
1296                         nla_nest_end(skb, af);
1297                 }
1298         }
1299
1300         nla_nest_end(skb, af_spec);
1301
1302         nlmsg_end(skb, nlh);
1303         return 0;
1304
1305 nla_put_failure:
1306         nlmsg_cancel(skb, nlh);
1307         return -EMSGSIZE;
1308 }
1309
1310 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1311         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1312         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1313         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1314         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1315         [IFLA_MTU]              = { .type = NLA_U32 },
1316         [IFLA_LINK]             = { .type = NLA_U32 },
1317         [IFLA_MASTER]           = { .type = NLA_U32 },
1318         [IFLA_CARRIER]          = { .type = NLA_U8 },
1319         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1320         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1321         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1322         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1323         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1324         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1325         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1326         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1327         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1328         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1329         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1330         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1331         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1332         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1333         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1334         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1335         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1336         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1337         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1338         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1339         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1340 };
1341
1342 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1343         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1344         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1345         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1346         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1347 };
1348
1349 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1350         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1351         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1352         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1353         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1354         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1355         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1356         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1357         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1358         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1359 };
1360
1361 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = {
1362         [IFLA_VF_STATS_RX_PACKETS]      = { .type = NLA_U64 },
1363         [IFLA_VF_STATS_TX_PACKETS]      = { .type = NLA_U64 },
1364         [IFLA_VF_STATS_RX_BYTES]        = { .type = NLA_U64 },
1365         [IFLA_VF_STATS_TX_BYTES]        = { .type = NLA_U64 },
1366         [IFLA_VF_STATS_BROADCAST]       = { .type = NLA_U64 },
1367         [IFLA_VF_STATS_MULTICAST]       = { .type = NLA_U64 },
1368 };
1369
1370 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1371         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1372         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1373                                     .len = PORT_PROFILE_MAX },
1374         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1375                                     .len = sizeof(struct ifla_port_vsi)},
1376         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1377                                       .len = PORT_UUID_MAX },
1378         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1379                                     .len = PORT_UUID_MAX },
1380         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1381         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1382 };
1383
1384 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1385 {
1386         struct net *net = sock_net(skb->sk);
1387         int h, s_h;
1388         int idx = 0, s_idx;
1389         struct net_device *dev;
1390         struct hlist_head *head;
1391         struct nlattr *tb[IFLA_MAX+1];
1392         u32 ext_filter_mask = 0;
1393         int err;
1394         int hdrlen;
1395
1396         s_h = cb->args[0];
1397         s_idx = cb->args[1];
1398
1399         cb->seq = net->dev_base_seq;
1400
1401         /* A hack to preserve kernel<->userspace interface.
1402          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1403          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1404          * what iproute2 < v3.9.0 used.
1405          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1406          * attribute, its netlink message is shorter than struct ifinfomsg.
1407          */
1408         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1409                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1410
1411         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1412
1413                 if (tb[IFLA_EXT_MASK])
1414                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1415         }
1416
1417         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1418                 idx = 0;
1419                 head = &net->dev_index_head[h];
1420                 hlist_for_each_entry(dev, head, index_hlist) {
1421                         if (idx < s_idx)
1422                                 goto cont;
1423                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1424                                                NETLINK_CB(cb->skb).portid,
1425                                                cb->nlh->nlmsg_seq, 0,
1426                                                NLM_F_MULTI,
1427                                                ext_filter_mask);
1428                         /* If we ran out of room on the first message,
1429                          * we're in trouble
1430                          */
1431                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1432
1433                         if (err < 0)
1434                                 goto out;
1435
1436                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1437 cont:
1438                         idx++;
1439                 }
1440         }
1441 out:
1442         cb->args[1] = idx;
1443         cb->args[0] = h;
1444
1445         return skb->len;
1446 }
1447
1448 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1449 {
1450         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1451 }
1452 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1453
1454 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1455 {
1456         struct net *net;
1457         /* Examine the link attributes and figure out which
1458          * network namespace we are talking about.
1459          */
1460         if (tb[IFLA_NET_NS_PID])
1461                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1462         else if (tb[IFLA_NET_NS_FD])
1463                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1464         else
1465                 net = get_net(src_net);
1466         return net;
1467 }
1468 EXPORT_SYMBOL(rtnl_link_get_net);
1469
1470 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1471 {
1472         if (dev) {
1473                 if (tb[IFLA_ADDRESS] &&
1474                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1475                         return -EINVAL;
1476
1477                 if (tb[IFLA_BROADCAST] &&
1478                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1479                         return -EINVAL;
1480         }
1481
1482         if (tb[IFLA_AF_SPEC]) {
1483                 struct nlattr *af;
1484                 int rem, err;
1485
1486                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1487                         const struct rtnl_af_ops *af_ops;
1488
1489                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1490                                 return -EAFNOSUPPORT;
1491
1492                         if (!af_ops->set_link_af)
1493                                 return -EOPNOTSUPP;
1494
1495                         if (af_ops->validate_link_af) {
1496                                 err = af_ops->validate_link_af(dev, af);
1497                                 if (err < 0)
1498                                         return err;
1499                         }
1500                 }
1501         }
1502
1503         return 0;
1504 }
1505
1506 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1507 {
1508         const struct net_device_ops *ops = dev->netdev_ops;
1509         int err = -EINVAL;
1510
1511         if (tb[IFLA_VF_MAC]) {
1512                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1513
1514                 err = -EOPNOTSUPP;
1515                 if (ops->ndo_set_vf_mac)
1516                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
1517                                                   ivm->mac);
1518                 if (err < 0)
1519                         return err;
1520         }
1521
1522         if (tb[IFLA_VF_VLAN]) {
1523                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1524
1525                 err = -EOPNOTSUPP;
1526                 if (ops->ndo_set_vf_vlan)
1527                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1528                                                    ivv->qos);
1529                 if (err < 0)
1530                         return err;
1531         }
1532
1533         if (tb[IFLA_VF_TX_RATE]) {
1534                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1535                 struct ifla_vf_info ivf;
1536
1537                 err = -EOPNOTSUPP;
1538                 if (ops->ndo_get_vf_config)
1539                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1540                 if (err < 0)
1541                         return err;
1542
1543                 err = -EOPNOTSUPP;
1544                 if (ops->ndo_set_vf_rate)
1545                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1546                                                    ivf.min_tx_rate,
1547                                                    ivt->rate);
1548                 if (err < 0)
1549                         return err;
1550         }
1551
1552         if (tb[IFLA_VF_RATE]) {
1553                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1554
1555                 err = -EOPNOTSUPP;
1556                 if (ops->ndo_set_vf_rate)
1557                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1558                                                    ivt->min_tx_rate,
1559                                                    ivt->max_tx_rate);
1560                 if (err < 0)
1561                         return err;
1562         }
1563
1564         if (tb[IFLA_VF_SPOOFCHK]) {
1565                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1566
1567                 err = -EOPNOTSUPP;
1568                 if (ops->ndo_set_vf_spoofchk)
1569                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1570                                                        ivs->setting);
1571                 if (err < 0)
1572                         return err;
1573         }
1574
1575         if (tb[IFLA_VF_LINK_STATE]) {
1576                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1577
1578                 err = -EOPNOTSUPP;
1579                 if (ops->ndo_set_vf_link_state)
1580                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1581                                                          ivl->link_state);
1582                 if (err < 0)
1583                         return err;
1584         }
1585
1586         if (tb[IFLA_VF_RSS_QUERY_EN]) {
1587                 struct ifla_vf_rss_query_en *ivrssq_en;
1588
1589                 err = -EOPNOTSUPP;
1590                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1591                 if (ops->ndo_set_vf_rss_query_en)
1592                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1593                                                            ivrssq_en->setting);
1594                 if (err < 0)
1595                         return err;
1596         }
1597
1598         if (tb[IFLA_VF_TRUST]) {
1599                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1600
1601                 err = -EOPNOTSUPP;
1602                 if (ops->ndo_set_vf_trust)
1603                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1604                 if (err < 0)
1605                         return err;
1606         }
1607
1608         return err;
1609 }
1610
1611 static int do_set_master(struct net_device *dev, int ifindex)
1612 {
1613         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1614         const struct net_device_ops *ops;
1615         int err;
1616
1617         if (upper_dev) {
1618                 if (upper_dev->ifindex == ifindex)
1619                         return 0;
1620                 ops = upper_dev->netdev_ops;
1621                 if (ops->ndo_del_slave) {
1622                         err = ops->ndo_del_slave(upper_dev, dev);
1623                         if (err)
1624                                 return err;
1625                 } else {
1626                         return -EOPNOTSUPP;
1627                 }
1628         }
1629
1630         if (ifindex) {
1631                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1632                 if (!upper_dev)
1633                         return -EINVAL;
1634                 ops = upper_dev->netdev_ops;
1635                 if (ops->ndo_add_slave) {
1636                         err = ops->ndo_add_slave(upper_dev, dev);
1637                         if (err)
1638                                 return err;
1639                 } else {
1640                         return -EOPNOTSUPP;
1641                 }
1642         }
1643         return 0;
1644 }
1645
1646 #define DO_SETLINK_MODIFIED     0x01
1647 /* notify flag means notify + modified. */
1648 #define DO_SETLINK_NOTIFY       0x03
1649 static int do_setlink(const struct sk_buff *skb,
1650                       struct net_device *dev, struct ifinfomsg *ifm,
1651                       struct nlattr **tb, char *ifname, int status)
1652 {
1653         const struct net_device_ops *ops = dev->netdev_ops;
1654         int err;
1655
1656         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1657                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1658                 if (IS_ERR(net)) {
1659                         err = PTR_ERR(net);
1660                         goto errout;
1661                 }
1662                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1663                         put_net(net);
1664                         err = -EPERM;
1665                         goto errout;
1666                 }
1667                 err = dev_change_net_namespace(dev, net, ifname);
1668                 put_net(net);
1669                 if (err)
1670                         goto errout;
1671                 status |= DO_SETLINK_MODIFIED;
1672         }
1673
1674         if (tb[IFLA_MAP]) {
1675                 struct rtnl_link_ifmap *u_map;
1676                 struct ifmap k_map;
1677
1678                 if (!ops->ndo_set_config) {
1679                         err = -EOPNOTSUPP;
1680                         goto errout;
1681                 }
1682
1683                 if (!netif_device_present(dev)) {
1684                         err = -ENODEV;
1685                         goto errout;
1686                 }
1687
1688                 u_map = nla_data(tb[IFLA_MAP]);
1689                 k_map.mem_start = (unsigned long) u_map->mem_start;
1690                 k_map.mem_end = (unsigned long) u_map->mem_end;
1691                 k_map.base_addr = (unsigned short) u_map->base_addr;
1692                 k_map.irq = (unsigned char) u_map->irq;
1693                 k_map.dma = (unsigned char) u_map->dma;
1694                 k_map.port = (unsigned char) u_map->port;
1695
1696                 err = ops->ndo_set_config(dev, &k_map);
1697                 if (err < 0)
1698                         goto errout;
1699
1700                 status |= DO_SETLINK_NOTIFY;
1701         }
1702
1703         if (tb[IFLA_ADDRESS]) {
1704                 struct sockaddr *sa;
1705                 int len;
1706
1707                 len = sizeof(sa_family_t) + dev->addr_len;
1708                 sa = kmalloc(len, GFP_KERNEL);
1709                 if (!sa) {
1710                         err = -ENOMEM;
1711                         goto errout;
1712                 }
1713                 sa->sa_family = dev->type;
1714                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1715                        dev->addr_len);
1716                 err = dev_set_mac_address(dev, sa);
1717                 kfree(sa);
1718                 if (err)
1719                         goto errout;
1720                 status |= DO_SETLINK_MODIFIED;
1721         }
1722
1723         if (tb[IFLA_MTU]) {
1724                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1725                 if (err < 0)
1726                         goto errout;
1727                 status |= DO_SETLINK_MODIFIED;
1728         }
1729
1730         if (tb[IFLA_GROUP]) {
1731                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1732                 status |= DO_SETLINK_NOTIFY;
1733         }
1734
1735         /*
1736          * Interface selected by interface index but interface
1737          * name provided implies that a name change has been
1738          * requested.
1739          */
1740         if (ifm->ifi_index > 0 && ifname[0]) {
1741                 err = dev_change_name(dev, ifname);
1742                 if (err < 0)
1743                         goto errout;
1744                 status |= DO_SETLINK_MODIFIED;
1745         }
1746
1747         if (tb[IFLA_IFALIAS]) {
1748                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1749                                     nla_len(tb[IFLA_IFALIAS]));
1750                 if (err < 0)
1751                         goto errout;
1752                 status |= DO_SETLINK_NOTIFY;
1753         }
1754
1755         if (tb[IFLA_BROADCAST]) {
1756                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1757                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1758         }
1759
1760         if (ifm->ifi_flags || ifm->ifi_change) {
1761                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1762                 if (err < 0)
1763                         goto errout;
1764         }
1765
1766         if (tb[IFLA_MASTER]) {
1767                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1768                 if (err)
1769                         goto errout;
1770                 status |= DO_SETLINK_MODIFIED;
1771         }
1772
1773         if (tb[IFLA_CARRIER]) {
1774                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1775                 if (err)
1776                         goto errout;
1777                 status |= DO_SETLINK_MODIFIED;
1778         }
1779
1780         if (tb[IFLA_TXQLEN]) {
1781                 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1782
1783                 if (dev->tx_queue_len ^ value)
1784                         status |= DO_SETLINK_NOTIFY;
1785
1786                 dev->tx_queue_len = value;
1787         }
1788
1789         if (tb[IFLA_OPERSTATE])
1790                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1791
1792         if (tb[IFLA_LINKMODE]) {
1793                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1794
1795                 write_lock_bh(&dev_base_lock);
1796                 if (dev->link_mode ^ value)
1797                         status |= DO_SETLINK_NOTIFY;
1798                 dev->link_mode = value;
1799                 write_unlock_bh(&dev_base_lock);
1800         }
1801
1802         if (tb[IFLA_VFINFO_LIST]) {
1803                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
1804                 struct nlattr *attr;
1805                 int rem;
1806
1807                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1808                         if (nla_type(attr) != IFLA_VF_INFO ||
1809                             nla_len(attr) < NLA_HDRLEN) {
1810                                 err = -EINVAL;
1811                                 goto errout;
1812                         }
1813                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
1814                                                ifla_vf_policy);
1815                         if (err < 0)
1816                                 goto errout;
1817                         err = do_setvfinfo(dev, vfinfo);
1818                         if (err < 0)
1819                                 goto errout;
1820                         status |= DO_SETLINK_NOTIFY;
1821                 }
1822         }
1823         err = 0;
1824
1825         if (tb[IFLA_VF_PORTS]) {
1826                 struct nlattr *port[IFLA_PORT_MAX+1];
1827                 struct nlattr *attr;
1828                 int vf;
1829                 int rem;
1830
1831                 err = -EOPNOTSUPP;
1832                 if (!ops->ndo_set_vf_port)
1833                         goto errout;
1834
1835                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1836                         if (nla_type(attr) != IFLA_VF_PORT ||
1837                             nla_len(attr) < NLA_HDRLEN) {
1838                                 err = -EINVAL;
1839                                 goto errout;
1840                         }
1841                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
1842                                                ifla_port_policy);
1843                         if (err < 0)
1844                                 goto errout;
1845                         if (!port[IFLA_PORT_VF]) {
1846                                 err = -EOPNOTSUPP;
1847                                 goto errout;
1848                         }
1849                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1850                         err = ops->ndo_set_vf_port(dev, vf, port);
1851                         if (err < 0)
1852                                 goto errout;
1853                         status |= DO_SETLINK_NOTIFY;
1854                 }
1855         }
1856         err = 0;
1857
1858         if (tb[IFLA_PORT_SELF]) {
1859                 struct nlattr *port[IFLA_PORT_MAX+1];
1860
1861                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1862                         tb[IFLA_PORT_SELF], ifla_port_policy);
1863                 if (err < 0)
1864                         goto errout;
1865
1866                 err = -EOPNOTSUPP;
1867                 if (ops->ndo_set_vf_port)
1868                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1869                 if (err < 0)
1870                         goto errout;
1871                 status |= DO_SETLINK_NOTIFY;
1872         }
1873
1874         if (tb[IFLA_AF_SPEC]) {
1875                 struct nlattr *af;
1876                 int rem;
1877
1878                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1879                         const struct rtnl_af_ops *af_ops;
1880
1881                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1882                                 BUG();
1883
1884                         err = af_ops->set_link_af(dev, af);
1885                         if (err < 0)
1886                                 goto errout;
1887
1888                         status |= DO_SETLINK_NOTIFY;
1889                 }
1890         }
1891         err = 0;
1892
1893         if (tb[IFLA_PROTO_DOWN]) {
1894                 err = dev_change_proto_down(dev,
1895                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
1896                 if (err)
1897                         goto errout;
1898                 status |= DO_SETLINK_NOTIFY;
1899         }
1900
1901 errout:
1902         if (status & DO_SETLINK_MODIFIED) {
1903                 if (status & DO_SETLINK_NOTIFY)
1904                         netdev_state_change(dev);
1905
1906                 if (err < 0)
1907                         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",
1908                                              dev->name);
1909         }
1910
1911         return err;
1912 }
1913
1914 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1915 {
1916         struct net *net = sock_net(skb->sk);
1917         struct ifinfomsg *ifm;
1918         struct net_device *dev;
1919         int err;
1920         struct nlattr *tb[IFLA_MAX+1];
1921         char ifname[IFNAMSIZ];
1922
1923         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1924         if (err < 0)
1925                 goto errout;
1926
1927         if (tb[IFLA_IFNAME])
1928                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1929         else
1930                 ifname[0] = '\0';
1931
1932         err = -EINVAL;
1933         ifm = nlmsg_data(nlh);
1934         if (ifm->ifi_index > 0)
1935                 dev = __dev_get_by_index(net, ifm->ifi_index);
1936         else if (tb[IFLA_IFNAME])
1937                 dev = __dev_get_by_name(net, ifname);
1938         else
1939                 goto errout;
1940
1941         if (dev == NULL) {
1942                 err = -ENODEV;
1943                 goto errout;
1944         }
1945
1946         err = validate_linkmsg(dev, tb);
1947         if (err < 0)
1948                 goto errout;
1949
1950         err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1951 errout:
1952         return err;
1953 }
1954
1955 static int rtnl_group_dellink(const struct net *net, int group)
1956 {
1957         struct net_device *dev, *aux;
1958         LIST_HEAD(list_kill);
1959         bool found = false;
1960
1961         if (!group)
1962                 return -EPERM;
1963
1964         for_each_netdev(net, dev) {
1965                 if (dev->group == group) {
1966                         const struct rtnl_link_ops *ops;
1967
1968                         found = true;
1969                         ops = dev->rtnl_link_ops;
1970                         if (!ops || !ops->dellink)
1971                                 return -EOPNOTSUPP;
1972                 }
1973         }
1974
1975         if (!found)
1976                 return -ENODEV;
1977
1978         for_each_netdev_safe(net, dev, aux) {
1979                 if (dev->group == group) {
1980                         const struct rtnl_link_ops *ops;
1981
1982                         ops = dev->rtnl_link_ops;
1983                         ops->dellink(dev, &list_kill);
1984                 }
1985         }
1986         unregister_netdevice_many(&list_kill);
1987
1988         return 0;
1989 }
1990
1991 int rtnl_delete_link(struct net_device *dev)
1992 {
1993         const struct rtnl_link_ops *ops;
1994         LIST_HEAD(list_kill);
1995
1996         ops = dev->rtnl_link_ops;
1997         if (!ops || !ops->dellink)
1998                 return -EOPNOTSUPP;
1999
2000         ops->dellink(dev, &list_kill);
2001         unregister_netdevice_many(&list_kill);
2002
2003         return 0;
2004 }
2005 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2006
2007 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2008 {
2009         struct net *net = sock_net(skb->sk);
2010         struct net_device *dev;
2011         struct ifinfomsg *ifm;
2012         char ifname[IFNAMSIZ];
2013         struct nlattr *tb[IFLA_MAX+1];
2014         int err;
2015
2016         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2017         if (err < 0)
2018                 return err;
2019
2020         if (tb[IFLA_IFNAME])
2021                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2022
2023         ifm = nlmsg_data(nlh);
2024         if (ifm->ifi_index > 0)
2025                 dev = __dev_get_by_index(net, ifm->ifi_index);
2026         else if (tb[IFLA_IFNAME])
2027                 dev = __dev_get_by_name(net, ifname);
2028         else if (tb[IFLA_GROUP])
2029                 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2030         else
2031                 return -EINVAL;
2032
2033         if (!dev)
2034                 return -ENODEV;
2035
2036         return rtnl_delete_link(dev);
2037 }
2038
2039 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2040 {
2041         unsigned int old_flags;
2042         int err;
2043
2044         old_flags = dev->flags;
2045         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2046                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2047                 if (err < 0)
2048                         return err;
2049         }
2050
2051         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2052
2053         __dev_notify_flags(dev, old_flags, ~0U);
2054         return 0;
2055 }
2056 EXPORT_SYMBOL(rtnl_configure_link);
2057
2058 struct net_device *rtnl_create_link(struct net *net,
2059         const char *ifname, unsigned char name_assign_type,
2060         const struct rtnl_link_ops *ops, struct nlattr *tb[])
2061 {
2062         int err;
2063         struct net_device *dev;
2064         unsigned int num_tx_queues = 1;
2065         unsigned int num_rx_queues = 1;
2066
2067         if (tb[IFLA_NUM_TX_QUEUES])
2068                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2069         else if (ops->get_num_tx_queues)
2070                 num_tx_queues = ops->get_num_tx_queues();
2071
2072         if (tb[IFLA_NUM_RX_QUEUES])
2073                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2074         else if (ops->get_num_rx_queues)
2075                 num_rx_queues = ops->get_num_rx_queues();
2076
2077         err = -ENOMEM;
2078         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2079                                ops->setup, num_tx_queues, num_rx_queues);
2080         if (!dev)
2081                 goto err;
2082
2083         dev_net_set(dev, net);
2084         dev->rtnl_link_ops = ops;
2085         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2086
2087         if (tb[IFLA_MTU])
2088                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2089         if (tb[IFLA_ADDRESS]) {
2090                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2091                                 nla_len(tb[IFLA_ADDRESS]));
2092                 dev->addr_assign_type = NET_ADDR_SET;
2093         }
2094         if (tb[IFLA_BROADCAST])
2095                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2096                                 nla_len(tb[IFLA_BROADCAST]));
2097         if (tb[IFLA_TXQLEN])
2098                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2099         if (tb[IFLA_OPERSTATE])
2100                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2101         if (tb[IFLA_LINKMODE])
2102                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2103         if (tb[IFLA_GROUP])
2104                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2105
2106         return dev;
2107
2108 err:
2109         return ERR_PTR(err);
2110 }
2111 EXPORT_SYMBOL(rtnl_create_link);
2112
2113 static int rtnl_group_changelink(const struct sk_buff *skb,
2114                 struct net *net, int group,
2115                 struct ifinfomsg *ifm,
2116                 struct nlattr **tb)
2117 {
2118         struct net_device *dev, *aux;
2119         int err;
2120
2121         for_each_netdev_safe(net, dev, aux) {
2122                 if (dev->group == group) {
2123                         err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2124                         if (err < 0)
2125                                 return err;
2126                 }
2127         }
2128
2129         return 0;
2130 }
2131
2132 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2133 {
2134         struct net *net = sock_net(skb->sk);
2135         const struct rtnl_link_ops *ops;
2136         const struct rtnl_link_ops *m_ops = NULL;
2137         struct net_device *dev;
2138         struct net_device *master_dev = NULL;
2139         struct ifinfomsg *ifm;
2140         char kind[MODULE_NAME_LEN];
2141         char ifname[IFNAMSIZ];
2142         struct nlattr *tb[IFLA_MAX+1];
2143         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2144         unsigned char name_assign_type = NET_NAME_USER;
2145         int err;
2146
2147 #ifdef CONFIG_MODULES
2148 replay:
2149 #endif
2150         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2151         if (err < 0)
2152                 return err;
2153
2154         if (tb[IFLA_IFNAME])
2155                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2156         else
2157                 ifname[0] = '\0';
2158
2159         ifm = nlmsg_data(nlh);
2160         if (ifm->ifi_index > 0)
2161                 dev = __dev_get_by_index(net, ifm->ifi_index);
2162         else {
2163                 if (ifname[0])
2164                         dev = __dev_get_by_name(net, ifname);
2165                 else
2166                         dev = NULL;
2167         }
2168
2169         if (dev) {
2170                 master_dev = netdev_master_upper_dev_get(dev);
2171                 if (master_dev)
2172                         m_ops = master_dev->rtnl_link_ops;
2173         }
2174
2175         err = validate_linkmsg(dev, tb);
2176         if (err < 0)
2177                 return err;
2178
2179         if (tb[IFLA_LINKINFO]) {
2180                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2181                                        tb[IFLA_LINKINFO], ifla_info_policy);
2182                 if (err < 0)
2183                         return err;
2184         } else
2185                 memset(linkinfo, 0, sizeof(linkinfo));
2186
2187         if (linkinfo[IFLA_INFO_KIND]) {
2188                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2189                 ops = rtnl_link_ops_get(kind);
2190         } else {
2191                 kind[0] = '\0';
2192                 ops = NULL;
2193         }
2194
2195         if (1) {
2196                 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2197                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2198                 struct nlattr **data = NULL;
2199                 struct nlattr **slave_data = NULL;
2200                 struct net *dest_net, *link_net = NULL;
2201
2202                 if (ops) {
2203                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2204                                 err = nla_parse_nested(attr, ops->maxtype,
2205                                                        linkinfo[IFLA_INFO_DATA],
2206                                                        ops->policy);
2207                                 if (err < 0)
2208                                         return err;
2209                                 data = attr;
2210                         }
2211                         if (ops->validate) {
2212                                 err = ops->validate(tb, data);
2213                                 if (err < 0)
2214                                         return err;
2215                         }
2216                 }
2217
2218                 if (m_ops) {
2219                         if (m_ops->slave_maxtype &&
2220                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2221                                 err = nla_parse_nested(slave_attr,
2222                                                        m_ops->slave_maxtype,
2223                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2224                                                        m_ops->slave_policy);
2225                                 if (err < 0)
2226                                         return err;
2227                                 slave_data = slave_attr;
2228                         }
2229                         if (m_ops->slave_validate) {
2230                                 err = m_ops->slave_validate(tb, slave_data);
2231                                 if (err < 0)
2232                                         return err;
2233                         }
2234                 }
2235
2236                 if (dev) {
2237                         int status = 0;
2238
2239                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2240                                 return -EEXIST;
2241                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2242                                 return -EOPNOTSUPP;
2243
2244                         if (linkinfo[IFLA_INFO_DATA]) {
2245                                 if (!ops || ops != dev->rtnl_link_ops ||
2246                                     !ops->changelink)
2247                                         return -EOPNOTSUPP;
2248
2249                                 err = ops->changelink(dev, tb, data);
2250                                 if (err < 0)
2251                                         return err;
2252                                 status |= DO_SETLINK_NOTIFY;
2253                         }
2254
2255                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2256                                 if (!m_ops || !m_ops->slave_changelink)
2257                                         return -EOPNOTSUPP;
2258
2259                                 err = m_ops->slave_changelink(master_dev, dev,
2260                                                               tb, slave_data);
2261                                 if (err < 0)
2262                                         return err;
2263                                 status |= DO_SETLINK_NOTIFY;
2264                         }
2265
2266                         return do_setlink(skb, dev, ifm, tb, ifname, status);
2267                 }
2268
2269                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2270                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2271                                 return rtnl_group_changelink(skb, net,
2272                                                 nla_get_u32(tb[IFLA_GROUP]),
2273                                                 ifm, tb);
2274                         return -ENODEV;
2275                 }
2276
2277                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2278                         return -EOPNOTSUPP;
2279
2280                 if (!ops) {
2281 #ifdef CONFIG_MODULES
2282                         if (kind[0]) {
2283                                 __rtnl_unlock();
2284                                 request_module("rtnl-link-%s", kind);
2285                                 rtnl_lock();
2286                                 ops = rtnl_link_ops_get(kind);
2287                                 if (ops)
2288                                         goto replay;
2289                         }
2290 #endif
2291                         return -EOPNOTSUPP;
2292                 }
2293
2294                 if (!ops->setup)
2295                         return -EOPNOTSUPP;
2296
2297                 if (!ifname[0]) {
2298                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2299                         name_assign_type = NET_NAME_ENUM;
2300                 }
2301
2302                 dest_net = rtnl_link_get_net(net, tb);
2303                 if (IS_ERR(dest_net))
2304                         return PTR_ERR(dest_net);
2305
2306                 err = -EPERM;
2307                 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2308                         goto out;
2309
2310                 if (tb[IFLA_LINK_NETNSID]) {
2311                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2312
2313                         link_net = get_net_ns_by_id(dest_net, id);
2314                         if (!link_net) {
2315                                 err =  -EINVAL;
2316                                 goto out;
2317                         }
2318                         err = -EPERM;
2319                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2320                                 goto out;
2321                 }
2322
2323                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2324                                        name_assign_type, ops, tb);
2325                 if (IS_ERR(dev)) {
2326                         err = PTR_ERR(dev);
2327                         goto out;
2328                 }
2329
2330                 dev->ifindex = ifm->ifi_index;
2331
2332                 if (ops->newlink) {
2333                         err = ops->newlink(link_net ? : net, dev, tb, data);
2334                         /* Drivers should call free_netdev() in ->destructor
2335                          * and unregister it on failure after registration
2336                          * so that device could be finally freed in rtnl_unlock.
2337                          */
2338                         if (err < 0) {
2339                                 /* If device is not registered at all, free it now */
2340                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2341                                         free_netdev(dev);
2342                                 goto out;
2343                         }
2344                 } else {
2345                         err = register_netdevice(dev);
2346                         if (err < 0) {
2347                                 free_netdev(dev);
2348                                 goto out;
2349                         }
2350                 }
2351                 err = rtnl_configure_link(dev, ifm);
2352                 if (err < 0)
2353                         goto out_unregister;
2354                 if (link_net) {
2355                         err = dev_change_net_namespace(dev, dest_net, ifname);
2356                         if (err < 0)
2357                                 goto out_unregister;
2358                 }
2359 out:
2360                 if (link_net)
2361                         put_net(link_net);
2362                 put_net(dest_net);
2363                 return err;
2364 out_unregister:
2365                 if (ops->newlink) {
2366                         LIST_HEAD(list_kill);
2367
2368                         ops->dellink(dev, &list_kill);
2369                         unregister_netdevice_many(&list_kill);
2370                 } else {
2371                         unregister_netdevice(dev);
2372                 }
2373                 goto out;
2374         }
2375 }
2376
2377 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2378 {
2379         struct net *net = sock_net(skb->sk);
2380         struct ifinfomsg *ifm;
2381         char ifname[IFNAMSIZ];
2382         struct nlattr *tb[IFLA_MAX+1];
2383         struct net_device *dev = NULL;
2384         struct sk_buff *nskb;
2385         int err;
2386         u32 ext_filter_mask = 0;
2387
2388         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2389         if (err < 0)
2390                 return err;
2391
2392         if (tb[IFLA_IFNAME])
2393                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2394
2395         if (tb[IFLA_EXT_MASK])
2396                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2397
2398         ifm = nlmsg_data(nlh);
2399         if (ifm->ifi_index > 0)
2400                 dev = __dev_get_by_index(net, ifm->ifi_index);
2401         else if (tb[IFLA_IFNAME])
2402                 dev = __dev_get_by_name(net, ifname);
2403         else
2404                 return -EINVAL;
2405
2406         if (dev == NULL)
2407                 return -ENODEV;
2408
2409         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2410         if (nskb == NULL)
2411                 return -ENOBUFS;
2412
2413         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2414                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2415         if (err < 0) {
2416                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2417                 WARN_ON(err == -EMSGSIZE);
2418                 kfree_skb(nskb);
2419         } else
2420                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2421
2422         return err;
2423 }
2424
2425 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2426 {
2427         struct net *net = sock_net(skb->sk);
2428         struct net_device *dev;
2429         struct nlattr *tb[IFLA_MAX+1];
2430         u32 ext_filter_mask = 0;
2431         u16 min_ifinfo_dump_size = 0;
2432         int hdrlen;
2433
2434         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2435         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2436                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2437
2438         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2439                 if (tb[IFLA_EXT_MASK])
2440                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2441         }
2442
2443         if (!ext_filter_mask)
2444                 return NLMSG_GOODSIZE;
2445         /*
2446          * traverse the list of net devices and compute the minimum
2447          * buffer size based upon the filter mask.
2448          */
2449         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2450                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2451                                              if_nlmsg_size(dev,
2452                                                            ext_filter_mask));
2453         }
2454
2455         return min_ifinfo_dump_size;
2456 }
2457
2458 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2459 {
2460         int idx;
2461         int s_idx = cb->family;
2462
2463         if (s_idx == 0)
2464                 s_idx = 1;
2465         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2466                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2467                 if (idx < s_idx || idx == PF_PACKET)
2468                         continue;
2469                 if (rtnl_msg_handlers[idx] == NULL ||
2470                     rtnl_msg_handlers[idx][type].dumpit == NULL)
2471                         continue;
2472                 if (idx > s_idx) {
2473                         memset(&cb->args[0], 0, sizeof(cb->args));
2474                         cb->prev_seq = 0;
2475                         cb->seq = 0;
2476                 }
2477                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2478                         break;
2479         }
2480         cb->family = idx;
2481
2482         return skb->len;
2483 }
2484
2485 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2486                                        unsigned int change, gfp_t flags)
2487 {
2488         struct net *net = dev_net(dev);
2489         struct sk_buff *skb;
2490         int err = -ENOBUFS;
2491         size_t if_info_size;
2492
2493         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2494         if (skb == NULL)
2495                 goto errout;
2496
2497         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2498         if (err < 0) {
2499                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2500                 WARN_ON(err == -EMSGSIZE);
2501                 kfree_skb(skb);
2502                 goto errout;
2503         }
2504         return skb;
2505 errout:
2506         if (err < 0)
2507                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2508         return NULL;
2509 }
2510
2511 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2512 {
2513         struct net *net = dev_net(dev);
2514
2515         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2516 }
2517
2518 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2519                   gfp_t flags)
2520 {
2521         struct sk_buff *skb;
2522
2523         if (dev->reg_state != NETREG_REGISTERED)
2524                 return;
2525
2526         skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2527         if (skb)
2528                 rtmsg_ifinfo_send(skb, dev, flags);
2529 }
2530 EXPORT_SYMBOL(rtmsg_ifinfo);
2531
2532 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2533                                    struct net_device *dev,
2534                                    u8 *addr, u16 vid, u32 pid, u32 seq,
2535                                    int type, unsigned int flags,
2536                                    int nlflags)
2537 {
2538         struct nlmsghdr *nlh;
2539         struct ndmsg *ndm;
2540
2541         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2542         if (!nlh)
2543                 return -EMSGSIZE;
2544
2545         ndm = nlmsg_data(nlh);
2546         ndm->ndm_family  = AF_BRIDGE;
2547         ndm->ndm_pad1    = 0;
2548         ndm->ndm_pad2    = 0;
2549         ndm->ndm_flags   = flags;
2550         ndm->ndm_type    = 0;
2551         ndm->ndm_ifindex = dev->ifindex;
2552         ndm->ndm_state   = NUD_PERMANENT;
2553
2554         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2555                 goto nla_put_failure;
2556         if (vid)
2557                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2558                         goto nla_put_failure;
2559
2560         nlmsg_end(skb, nlh);
2561         return 0;
2562
2563 nla_put_failure:
2564         nlmsg_cancel(skb, nlh);
2565         return -EMSGSIZE;
2566 }
2567
2568 static inline size_t rtnl_fdb_nlmsg_size(void)
2569 {
2570         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2571 }
2572
2573 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type)
2574 {
2575         struct net *net = dev_net(dev);
2576         struct sk_buff *skb;
2577         int err = -ENOBUFS;
2578
2579         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2580         if (!skb)
2581                 goto errout;
2582
2583         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2584                                       0, 0, type, NTF_SELF, 0);
2585         if (err < 0) {
2586                 kfree_skb(skb);
2587                 goto errout;
2588         }
2589
2590         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2591         return;
2592 errout:
2593         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2594 }
2595
2596 /**
2597  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2598  */
2599 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2600                      struct nlattr *tb[],
2601                      struct net_device *dev,
2602                      const unsigned char *addr, u16 vid,
2603                      u16 flags)
2604 {
2605         int err = -EINVAL;
2606
2607         /* If aging addresses are supported device will need to
2608          * implement its own handler for this.
2609          */
2610         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2611                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2612                 return err;
2613         }
2614
2615         if (vid) {
2616                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2617                 return err;
2618         }
2619
2620         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2621                 err = dev_uc_add_excl(dev, addr);
2622         else if (is_multicast_ether_addr(addr))
2623                 err = dev_mc_add_excl(dev, addr);
2624
2625         /* Only return duplicate errors if NLM_F_EXCL is set */
2626         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2627                 err = 0;
2628
2629         return err;
2630 }
2631 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2632
2633 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2634 {
2635         u16 vid = 0;
2636
2637         if (vlan_attr) {
2638                 if (nla_len(vlan_attr) != sizeof(u16)) {
2639                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2640                         return -EINVAL;
2641                 }
2642
2643                 vid = nla_get_u16(vlan_attr);
2644
2645                 if (!vid || vid >= VLAN_VID_MASK) {
2646                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2647                                 vid);
2648                         return -EINVAL;
2649                 }
2650         }
2651         *p_vid = vid;
2652         return 0;
2653 }
2654
2655 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2656 {
2657         struct net *net = sock_net(skb->sk);
2658         struct ndmsg *ndm;
2659         struct nlattr *tb[NDA_MAX+1];
2660         struct net_device *dev;
2661         u8 *addr;
2662         u16 vid;
2663         int err;
2664
2665         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2666         if (err < 0)
2667                 return err;
2668
2669         ndm = nlmsg_data(nlh);
2670         if (ndm->ndm_ifindex == 0) {
2671                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2672                 return -EINVAL;
2673         }
2674
2675         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2676         if (dev == NULL) {
2677                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2678                 return -ENODEV;
2679         }
2680
2681         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2682                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2683                 return -EINVAL;
2684         }
2685
2686         addr = nla_data(tb[NDA_LLADDR]);
2687
2688         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2689         if (err)
2690                 return err;
2691
2692         err = -EOPNOTSUPP;
2693
2694         /* Support fdb on master device the net/bridge default case */
2695         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2696             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2697                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2698                 const struct net_device_ops *ops = br_dev->netdev_ops;
2699
2700                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2701                                        nlh->nlmsg_flags);
2702                 if (err)
2703                         goto out;
2704                 else
2705                         ndm->ndm_flags &= ~NTF_MASTER;
2706         }
2707
2708         /* Embedded bridge, macvlan, and any other device support */
2709         if ((ndm->ndm_flags & NTF_SELF)) {
2710                 if (dev->netdev_ops->ndo_fdb_add)
2711                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2712                                                            vid,
2713                                                            nlh->nlmsg_flags);
2714                 else
2715                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2716                                                nlh->nlmsg_flags);
2717
2718                 if (!err) {
2719                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH);
2720                         ndm->ndm_flags &= ~NTF_SELF;
2721                 }
2722         }
2723 out:
2724         return err;
2725 }
2726
2727 /**
2728  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2729  */
2730 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2731                      struct nlattr *tb[],
2732                      struct net_device *dev,
2733                      const unsigned char *addr, u16 vid)
2734 {
2735         int err = -EINVAL;
2736
2737         /* If aging addresses are supported device will need to
2738          * implement its own handler for this.
2739          */
2740         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2741                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2742                 return err;
2743         }
2744
2745         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2746                 err = dev_uc_del(dev, addr);
2747         else if (is_multicast_ether_addr(addr))
2748                 err = dev_mc_del(dev, addr);
2749
2750         return err;
2751 }
2752 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2753
2754 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2755 {
2756         struct net *net = sock_net(skb->sk);
2757         struct ndmsg *ndm;
2758         struct nlattr *tb[NDA_MAX+1];
2759         struct net_device *dev;
2760         int err = -EINVAL;
2761         __u8 *addr;
2762         u16 vid;
2763
2764         if (!netlink_capable(skb, CAP_NET_ADMIN))
2765                 return -EPERM;
2766
2767         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2768         if (err < 0)
2769                 return err;
2770
2771         ndm = nlmsg_data(nlh);
2772         if (ndm->ndm_ifindex == 0) {
2773                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2774                 return -EINVAL;
2775         }
2776
2777         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2778         if (dev == NULL) {
2779                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2780                 return -ENODEV;
2781         }
2782
2783         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2784                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2785                 return -EINVAL;
2786         }
2787
2788         addr = nla_data(tb[NDA_LLADDR]);
2789
2790         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2791         if (err)
2792                 return err;
2793
2794         err = -EOPNOTSUPP;
2795
2796         /* Support fdb on master device the net/bridge default case */
2797         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2798             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2799                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2800                 const struct net_device_ops *ops = br_dev->netdev_ops;
2801
2802                 if (ops->ndo_fdb_del)
2803                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
2804
2805                 if (err)
2806                         goto out;
2807                 else
2808                         ndm->ndm_flags &= ~NTF_MASTER;
2809         }
2810
2811         /* Embedded bridge, macvlan, and any other device support */
2812         if (ndm->ndm_flags & NTF_SELF) {
2813                 if (dev->netdev_ops->ndo_fdb_del)
2814                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
2815                                                            vid);
2816                 else
2817                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
2818
2819                 if (!err) {
2820                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH);
2821                         ndm->ndm_flags &= ~NTF_SELF;
2822                 }
2823         }
2824 out:
2825         return err;
2826 }
2827
2828 static int nlmsg_populate_fdb(struct sk_buff *skb,
2829                               struct netlink_callback *cb,
2830                               struct net_device *dev,
2831                               int *idx,
2832                               struct netdev_hw_addr_list *list)
2833 {
2834         struct netdev_hw_addr *ha;
2835         int err;
2836         u32 portid, seq;
2837
2838         portid = NETLINK_CB(cb->skb).portid;
2839         seq = cb->nlh->nlmsg_seq;
2840
2841         list_for_each_entry(ha, &list->list, list) {
2842                 if (*idx < cb->args[0])
2843                         goto skip;
2844
2845                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
2846                                               portid, seq,
2847                                               RTM_NEWNEIGH, NTF_SELF,
2848                                               NLM_F_MULTI);
2849                 if (err < 0)
2850                         return err;
2851 skip:
2852                 *idx += 1;
2853         }
2854         return 0;
2855 }
2856
2857 /**
2858  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2859  * @nlh: netlink message header
2860  * @dev: netdevice
2861  *
2862  * Default netdevice operation to dump the existing unicast address list.
2863  * Returns number of addresses from list put in skb.
2864  */
2865 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2866                       struct netlink_callback *cb,
2867                       struct net_device *dev,
2868                       struct net_device *filter_dev,
2869                       int idx)
2870 {
2871         int err;
2872
2873         netif_addr_lock_bh(dev);
2874         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2875         if (err)
2876                 goto out;
2877         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2878 out:
2879         netif_addr_unlock_bh(dev);
2880         return idx;
2881 }
2882 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2883
2884 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2885 {
2886         struct net_device *dev;
2887         struct nlattr *tb[IFLA_MAX+1];
2888         struct net_device *br_dev = NULL;
2889         const struct net_device_ops *ops = NULL;
2890         const struct net_device_ops *cops = NULL;
2891         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2892         struct net *net = sock_net(skb->sk);
2893         int brport_idx = 0;
2894         int br_idx = 0;
2895         int idx = 0;
2896
2897         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2898                         ifla_policy) == 0) {
2899                 if (tb[IFLA_MASTER])
2900                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
2901         }
2902
2903         brport_idx = ifm->ifi_index;
2904
2905         if (br_idx) {
2906                 br_dev = __dev_get_by_index(net, br_idx);
2907                 if (!br_dev)
2908                         return -ENODEV;
2909
2910                 ops = br_dev->netdev_ops;
2911         }
2912
2913         for_each_netdev(net, dev) {
2914                 if (brport_idx && (dev->ifindex != brport_idx))
2915                         continue;
2916
2917                 if (!br_idx) { /* user did not specify a specific bridge */
2918                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
2919                                 br_dev = netdev_master_upper_dev_get(dev);
2920                                 cops = br_dev->netdev_ops;
2921                         }
2922
2923                 } else {
2924                         if (dev != br_dev &&
2925                             !(dev->priv_flags & IFF_BRIDGE_PORT))
2926                                 continue;
2927
2928                         if (br_dev != netdev_master_upper_dev_get(dev) &&
2929                             !(dev->priv_flags & IFF_EBRIDGE))
2930                                 continue;
2931
2932                         cops = ops;
2933                 }
2934
2935                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2936                         if (cops && cops->ndo_fdb_dump)
2937                                 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2938                                                          idx);
2939                 }
2940
2941                 if (dev->netdev_ops->ndo_fdb_dump)
2942                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
2943                                                             idx);
2944                 else
2945                         idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2946
2947                 cops = NULL;
2948         }
2949
2950         cb->args[0] = idx;
2951         return skb->len;
2952 }
2953
2954 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
2955                                unsigned int attrnum, unsigned int flag)
2956 {
2957         if (mask & flag)
2958                 return nla_put_u8(skb, attrnum, !!(flags & flag));
2959         return 0;
2960 }
2961
2962 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2963                             struct net_device *dev, u16 mode,
2964                             u32 flags, u32 mask, int nlflags,
2965                             u32 filter_mask,
2966                             int (*vlan_fill)(struct sk_buff *skb,
2967                                              struct net_device *dev,
2968                                              u32 filter_mask))
2969 {
2970         struct nlmsghdr *nlh;
2971         struct ifinfomsg *ifm;
2972         struct nlattr *br_afspec;
2973         struct nlattr *protinfo;
2974         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2975         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2976         int err = 0;
2977
2978         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
2979         if (nlh == NULL)
2980                 return -EMSGSIZE;
2981
2982         ifm = nlmsg_data(nlh);
2983         ifm->ifi_family = AF_BRIDGE;
2984         ifm->__ifi_pad = 0;
2985         ifm->ifi_type = dev->type;
2986         ifm->ifi_index = dev->ifindex;
2987         ifm->ifi_flags = dev_get_flags(dev);
2988         ifm->ifi_change = 0;
2989
2990
2991         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2992             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2993             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2994             (br_dev &&
2995              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2996             (dev->addr_len &&
2997              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2998             (dev->ifindex != dev_get_iflink(dev) &&
2999              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3000                 goto nla_put_failure;
3001
3002         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3003         if (!br_afspec)
3004                 goto nla_put_failure;
3005
3006         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3007                 nla_nest_cancel(skb, br_afspec);
3008                 goto nla_put_failure;
3009         }
3010
3011         if (mode != BRIDGE_MODE_UNDEF) {
3012                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3013                         nla_nest_cancel(skb, br_afspec);
3014                         goto nla_put_failure;
3015                 }
3016         }
3017         if (vlan_fill) {
3018                 err = vlan_fill(skb, dev, filter_mask);
3019                 if (err) {
3020                         nla_nest_cancel(skb, br_afspec);
3021                         goto nla_put_failure;
3022                 }
3023         }
3024         nla_nest_end(skb, br_afspec);
3025
3026         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3027         if (!protinfo)
3028                 goto nla_put_failure;
3029
3030         if (brport_nla_put_flag(skb, flags, mask,
3031                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3032             brport_nla_put_flag(skb, flags, mask,
3033                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3034             brport_nla_put_flag(skb, flags, mask,
3035                                 IFLA_BRPORT_FAST_LEAVE,
3036                                 BR_MULTICAST_FAST_LEAVE) ||
3037             brport_nla_put_flag(skb, flags, mask,
3038                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3039             brport_nla_put_flag(skb, flags, mask,
3040                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3041             brport_nla_put_flag(skb, flags, mask,
3042                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3043             brport_nla_put_flag(skb, flags, mask,
3044                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3045             brport_nla_put_flag(skb, flags, mask,
3046                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3047                 nla_nest_cancel(skb, protinfo);
3048                 goto nla_put_failure;
3049         }
3050
3051         nla_nest_end(skb, protinfo);
3052
3053         nlmsg_end(skb, nlh);
3054         return 0;
3055 nla_put_failure:
3056         nlmsg_cancel(skb, nlh);
3057         return err ? err : -EMSGSIZE;
3058 }
3059 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3060
3061 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3062 {
3063         struct net *net = sock_net(skb->sk);
3064         struct net_device *dev;
3065         int idx = 0;
3066         u32 portid = NETLINK_CB(cb->skb).portid;
3067         u32 seq = cb->nlh->nlmsg_seq;
3068         u32 filter_mask = 0;
3069         int err;
3070
3071         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3072                 struct nlattr *extfilt;
3073
3074                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3075                                           IFLA_EXT_MASK);
3076                 if (extfilt) {
3077                         if (nla_len(extfilt) < sizeof(filter_mask))
3078                                 return -EINVAL;
3079
3080                         filter_mask = nla_get_u32(extfilt);
3081                 }
3082         }
3083
3084         rcu_read_lock();
3085         for_each_netdev_rcu(net, dev) {
3086                 const struct net_device_ops *ops = dev->netdev_ops;
3087                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3088
3089                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3090                         if (idx >= cb->args[0]) {
3091                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
3092                                                 skb, portid, seq, dev,
3093                                                 filter_mask, NLM_F_MULTI);
3094                                 if (err < 0 && err != -EOPNOTSUPP)
3095                                         break;
3096                         }
3097                         idx++;
3098                 }
3099
3100                 if (ops->ndo_bridge_getlink) {
3101                         if (idx >= cb->args[0]) {
3102                                 err = ops->ndo_bridge_getlink(skb, portid,
3103                                                               seq, dev,
3104                                                               filter_mask,
3105                                                               NLM_F_MULTI);
3106                                 if (err < 0 && err != -EOPNOTSUPP)
3107                                         break;
3108                         }
3109                         idx++;
3110                 }
3111         }
3112         rcu_read_unlock();
3113         cb->args[0] = idx;
3114
3115         return skb->len;
3116 }
3117
3118 static inline size_t bridge_nlmsg_size(void)
3119 {
3120         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3121                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
3122                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
3123                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
3124                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
3125                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
3126                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
3127                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
3128                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3129                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
3130                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
3131 }
3132
3133 static int rtnl_bridge_notify(struct net_device *dev)
3134 {
3135         struct net *net = dev_net(dev);
3136         struct sk_buff *skb;
3137         int err = -EOPNOTSUPP;
3138
3139         if (!dev->netdev_ops->ndo_bridge_getlink)
3140                 return 0;
3141
3142         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3143         if (!skb) {
3144                 err = -ENOMEM;
3145                 goto errout;
3146         }
3147
3148         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3149         if (err < 0)
3150                 goto errout;
3151
3152         if (!skb->len)
3153                 goto errout;
3154
3155         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3156         return 0;
3157 errout:
3158         WARN_ON(err == -EMSGSIZE);
3159         kfree_skb(skb);
3160         if (err)
3161                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3162         return err;
3163 }
3164
3165 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3166 {
3167         struct net *net = sock_net(skb->sk);
3168         struct ifinfomsg *ifm;
3169         struct net_device *dev;
3170         struct nlattr *br_spec, *attr = NULL;
3171         int rem, err = -EOPNOTSUPP;
3172         u16 flags = 0;
3173         bool have_flags = false;
3174
3175         if (nlmsg_len(nlh) < sizeof(*ifm))
3176                 return -EINVAL;
3177
3178         ifm = nlmsg_data(nlh);
3179         if (ifm->ifi_family != AF_BRIDGE)
3180                 return -EPFNOSUPPORT;
3181
3182         dev = __dev_get_by_index(net, ifm->ifi_index);
3183         if (!dev) {
3184                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3185                 return -ENODEV;
3186         }
3187
3188         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3189         if (br_spec) {
3190                 nla_for_each_nested(attr, br_spec, rem) {
3191                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3192                                 if (nla_len(attr) < sizeof(flags))
3193                                         return -EINVAL;
3194
3195                                 have_flags = true;
3196                                 flags = nla_get_u16(attr);
3197                                 break;
3198                         }
3199                 }
3200         }
3201
3202         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3203                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3204
3205                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3206                         err = -EOPNOTSUPP;
3207                         goto out;
3208                 }
3209
3210                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3211                 if (err)
3212                         goto out;
3213
3214                 flags &= ~BRIDGE_FLAGS_MASTER;
3215         }
3216
3217         if ((flags & BRIDGE_FLAGS_SELF)) {
3218                 if (!dev->netdev_ops->ndo_bridge_setlink)
3219                         err = -EOPNOTSUPP;
3220                 else
3221                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3222                                                                   flags);
3223                 if (!err) {
3224                         flags &= ~BRIDGE_FLAGS_SELF;
3225
3226                         /* Generate event to notify upper layer of bridge
3227                          * change
3228                          */
3229                         err = rtnl_bridge_notify(dev);
3230                 }
3231         }
3232
3233         if (have_flags)
3234                 memcpy(nla_data(attr), &flags, sizeof(flags));
3235 out:
3236         return err;
3237 }
3238
3239 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3240 {
3241         struct net *net = sock_net(skb->sk);
3242         struct ifinfomsg *ifm;
3243         struct net_device *dev;
3244         struct nlattr *br_spec, *attr = NULL;
3245         int rem, err = -EOPNOTSUPP;
3246         u16 flags = 0;
3247         bool have_flags = false;
3248
3249         if (nlmsg_len(nlh) < sizeof(*ifm))
3250                 return -EINVAL;
3251
3252         ifm = nlmsg_data(nlh);
3253         if (ifm->ifi_family != AF_BRIDGE)
3254                 return -EPFNOSUPPORT;
3255
3256         dev = __dev_get_by_index(net, ifm->ifi_index);
3257         if (!dev) {
3258                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3259                 return -ENODEV;
3260         }
3261
3262         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3263         if (br_spec) {
3264                 nla_for_each_nested(attr, br_spec, rem) {
3265                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3266                                 if (nla_len(attr) < sizeof(flags))
3267                                         return -EINVAL;
3268
3269                                 have_flags = true;
3270                                 flags = nla_get_u16(attr);
3271                                 break;
3272                         }
3273                 }
3274         }
3275
3276         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3277                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3278
3279                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3280                         err = -EOPNOTSUPP;
3281                         goto out;
3282                 }
3283
3284                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3285                 if (err)
3286                         goto out;
3287
3288                 flags &= ~BRIDGE_FLAGS_MASTER;
3289         }
3290
3291         if ((flags & BRIDGE_FLAGS_SELF)) {
3292                 if (!dev->netdev_ops->ndo_bridge_dellink)
3293                         err = -EOPNOTSUPP;
3294                 else
3295                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3296                                                                   flags);
3297
3298                 if (!err) {
3299                         flags &= ~BRIDGE_FLAGS_SELF;
3300
3301                         /* Generate event to notify upper layer of bridge
3302                          * change
3303                          */
3304                         err = rtnl_bridge_notify(dev);
3305                 }
3306         }
3307
3308         if (have_flags)
3309                 memcpy(nla_data(attr), &flags, sizeof(flags));
3310 out:
3311         return err;
3312 }
3313
3314 /* Process one rtnetlink message. */
3315
3316 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3317 {
3318         struct net *net = sock_net(skb->sk);
3319         rtnl_doit_func doit;
3320         int sz_idx, kind;
3321         int family;
3322         int type;
3323         int err;
3324
3325         type = nlh->nlmsg_type;
3326         if (type > RTM_MAX)
3327                 return -EOPNOTSUPP;
3328
3329         type -= RTM_BASE;
3330
3331         /* All the messages must have at least 1 byte length */
3332         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3333                 return 0;
3334
3335         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3336         sz_idx = type>>2;
3337         kind = type&3;
3338
3339         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3340                 return -EPERM;
3341
3342         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3343                 struct sock *rtnl;
3344                 rtnl_dumpit_func dumpit;
3345                 rtnl_calcit_func calcit;
3346                 u16 min_dump_alloc = 0;
3347
3348                 dumpit = rtnl_get_dumpit(family, type);
3349                 if (dumpit == NULL)
3350                         return -EOPNOTSUPP;
3351                 calcit = rtnl_get_calcit(family, type);
3352                 if (calcit)
3353                         min_dump_alloc = calcit(skb, nlh);
3354
3355                 __rtnl_unlock();
3356                 rtnl = net->rtnl;
3357                 {
3358                         struct netlink_dump_control c = {
3359                                 .dump           = dumpit,
3360                                 .min_dump_alloc = min_dump_alloc,
3361                         };
3362                         err = netlink_dump_start(rtnl, skb, nlh, &c);
3363                 }
3364                 rtnl_lock();
3365                 return err;
3366         }
3367
3368         doit = rtnl_get_doit(family, type);
3369         if (doit == NULL)
3370                 return -EOPNOTSUPP;
3371
3372         return doit(skb, nlh);
3373 }
3374
3375 static void rtnetlink_rcv(struct sk_buff *skb)
3376 {
3377         rtnl_lock();
3378         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3379         rtnl_unlock();
3380 }
3381
3382 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3383 {
3384         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3385
3386         switch (event) {
3387         case NETDEV_UP:
3388         case NETDEV_DOWN:
3389         case NETDEV_PRE_UP:
3390         case NETDEV_POST_INIT:
3391         case NETDEV_REGISTER:
3392         case NETDEV_CHANGE:
3393         case NETDEV_PRE_TYPE_CHANGE:
3394         case NETDEV_GOING_DOWN:
3395         case NETDEV_UNREGISTER:
3396         case NETDEV_UNREGISTER_FINAL:
3397         case NETDEV_RELEASE:
3398         case NETDEV_JOIN:
3399         case NETDEV_BONDING_INFO:
3400                 break;
3401         default:
3402                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3403                 break;
3404         }
3405         return NOTIFY_DONE;
3406 }
3407
3408 static struct notifier_block rtnetlink_dev_notifier = {
3409         .notifier_call  = rtnetlink_event,
3410 };
3411
3412
3413 static int __net_init rtnetlink_net_init(struct net *net)
3414 {
3415         struct sock *sk;
3416         struct netlink_kernel_cfg cfg = {
3417                 .groups         = RTNLGRP_MAX,
3418                 .input          = rtnetlink_rcv,
3419                 .cb_mutex       = &rtnl_mutex,
3420                 .flags          = NL_CFG_F_NONROOT_RECV,
3421         };
3422
3423         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3424         if (!sk)
3425                 return -ENOMEM;
3426         net->rtnl = sk;
3427         return 0;
3428 }
3429
3430 static void __net_exit rtnetlink_net_exit(struct net *net)
3431 {
3432         netlink_kernel_release(net->rtnl);
3433         net->rtnl = NULL;
3434 }
3435
3436 static struct pernet_operations rtnetlink_net_ops = {
3437         .init = rtnetlink_net_init,
3438         .exit = rtnetlink_net_exit,
3439 };
3440
3441 void __init rtnetlink_init(void)
3442 {
3443         if (register_pernet_subsys(&rtnetlink_net_ops))
3444                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3445
3446         register_netdevice_notifier(&rtnetlink_dev_notifier);
3447
3448         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3449                       rtnl_dump_ifinfo, rtnl_calcit);
3450         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3451         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3452         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3453
3454         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3455         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3456
3457         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3458         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3459         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3460
3461         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3462         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3463         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3464 }