kernel/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(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
 909                + nla_total_size(1); /* IFLA_PROTO_DOWN */
 910
 911 }
 912
 913 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 914 {
 915         struct nlattr *vf_ports;
 916         struct nlattr *vf_port;
 917         int vf;
 918         int err;
 919
 920         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 921         if (!vf_ports)
 922                 return -EMSGSIZE;
 923
 924         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 925                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 926                 if (!vf_port)
 927                         goto nla_put_failure;
 928                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 929                         goto nla_put_failure;
 930                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 931                 if (err == -EMSGSIZE)
 932                         goto nla_put_failure;
 933                 if (err) {
 934                         nla_nest_cancel(skb, vf_port);
 935                         continue;
 936                 }
 937                 nla_nest_end(skb, vf_port);
 938         }
 939
 940         nla_nest_end(skb, vf_ports);
 941
 942         return 0;
 943
 944 nla_put_failure:
 945         nla_nest_cancel(skb, vf_ports);
 946         return -EMSGSIZE;
 947 }
 948
 949 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 950 {
 951         struct nlattr *port_self;
 952         int err;
 953
 954         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 955         if (!port_self)
 956                 return -EMSGSIZE;
 957
 958         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 959         if (err) {
 960                 nla_nest_cancel(skb, port_self);
 961                 return (err == -EMSGSIZE) ? err : 0;
 962         }
 963
 964         nla_nest_end(skb, port_self);
 965
 966         return 0;
 967 }
 968
 969 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
 970                           u32 ext_filter_mask)
 971 {
 972         int err;
 973
 974         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 975             !(ext_filter_mask & RTEXT_FILTER_VF))
 976                 return 0;
 977
 978         err = rtnl_port_self_fill(skb, dev);
 979         if (err)
 980                 return err;
 981
 982         if (dev_num_vf(dev->dev.parent)) {
 983                 err = rtnl_vf_ports_fill(skb, dev);
 984                 if (err)
 985                         return err;
 986         }
 987
 988         return 0;
 989 }
 990
 991 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
 992 {
 993         int err;
 994         struct netdev_phys_item_id ppid;
 995
 996         err = dev_get_phys_port_id(dev, &ppid);
 997         if (err) {
 998                 if (err == -EOPNOTSUPP)
 999                         return 0;
1000                 return err;
1001         }
1002
1003         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1004                 return -EMSGSIZE;
1005
1006         return 0;
1007 }
1008
1009 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1010 {
1011         char name[IFNAMSIZ];
1012         int err;
1013
1014         err = dev_get_phys_port_name(dev, name, sizeof(name));
1015         if (err) {
1016                 if (err == -EOPNOTSUPP)
1017                         return 0;
1018                 return err;
1019         }
1020
1021         if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
1022                 return -EMSGSIZE;
1023
1024         return 0;
1025 }
1026
1027 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1028 {
1029         int err;
1030         struct switchdev_attr attr = {
1031                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1032                 .flags = SWITCHDEV_F_NO_RECURSE,
1033         };
1034
1035         err = switchdev_port_attr_get(dev, &attr);
1036         if (err) {
1037                 if (err == -EOPNOTSUPP)
1038                         return 0;
1039                 return err;
1040         }
1041
1042         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1043                     attr.u.ppid.id))
1044                 return -EMSGSIZE;
1045
1046         return 0;
1047 }
1048
1049 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1050                                               struct net_device *dev)
1051 {
1052         const struct rtnl_link_stats64 *stats;
1053         struct rtnl_link_stats64 temp;
1054         struct nlattr *attr;
1055
1056         stats = dev_get_stats(dev, &temp);
1057
1058         attr = nla_reserve(skb, IFLA_STATS,
1059                            sizeof(struct rtnl_link_stats));
1060         if (!attr)
1061                 return -EMSGSIZE;
1062
1063         copy_rtnl_link_stats(nla_data(attr), stats);
1064
1065         attr = nla_reserve(skb, IFLA_STATS64,
1066                            sizeof(struct rtnl_link_stats64));
1067         if (!attr)
1068                 return -EMSGSIZE;
1069
1070         copy_rtnl_link_stats64(nla_data(attr), stats);
1071
1072         return 0;
1073 }
1074
1075 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1076                                                struct net_device *dev,
1077                                                int vfs_num,
1078                                                struct nlattr *vfinfo)
1079 {
1080         struct ifla_vf_rss_query_en vf_rss_query_en;
1081         struct ifla_vf_link_state vf_linkstate;
1082         struct ifla_vf_spoofchk vf_spoofchk;
1083         struct ifla_vf_tx_rate vf_tx_rate;
1084         struct ifla_vf_stats vf_stats;
1085         struct ifla_vf_trust vf_trust;
1086         struct ifla_vf_vlan vf_vlan;
1087         struct ifla_vf_rate vf_rate;
1088         struct nlattr *vf, *vfstats;
1089         struct ifla_vf_mac vf_mac;
1090         struct ifla_vf_info ivi;
1091
1092         /* Not all SR-IOV capable drivers support the
1093          * spoofcheck and "RSS query enable" query.  Preset to
1094          * -1 so the user space tool can detect that the driver
1095          * didn't report anything.
1096          */
1097         ivi.spoofchk = -1;
1098         ivi.rss_query_en = -1;
1099         ivi.trusted = -1;
1100         memset(ivi.mac, 0, sizeof(ivi.mac));
1101         /* The default value for VF link state is "auto"
1102          * IFLA_VF_LINK_STATE_AUTO which equals zero
1103          */
1104         ivi.linkstate = 0;
1105         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1106                 return 0;
1107
1108         vf_mac.vf =
1109                 vf_vlan.vf =
1110                 vf_rate.vf =
1111                 vf_tx_rate.vf =
1112                 vf_spoofchk.vf =
1113                 vf_linkstate.vf =
1114                 vf_rss_query_en.vf =
1115                 vf_trust.vf = ivi.vf;
1116
1117         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1118         vf_vlan.vlan = ivi.vlan;
1119         vf_vlan.qos = ivi.qos;
1120         vf_tx_rate.rate = ivi.max_tx_rate;
1121         vf_rate.min_tx_rate = ivi.min_tx_rate;
1122         vf_rate.max_tx_rate = ivi.max_tx_rate;
1123         vf_spoofchk.setting = ivi.spoofchk;
1124         vf_linkstate.link_state = ivi.linkstate;
1125         vf_rss_query_en.setting = ivi.rss_query_en;
1126         vf_trust.setting = ivi.trusted;
1127         vf = nla_nest_start(skb, IFLA_VF_INFO);
1128         if (!vf) {
1129                 nla_nest_cancel(skb, vfinfo);
1130                 return -EMSGSIZE;
1131         }
1132         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1133             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1134             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1135                     &vf_rate) ||
1136             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1137                     &vf_tx_rate) ||
1138             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1139                     &vf_spoofchk) ||
1140             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1141                     &vf_linkstate) ||
1142             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1143                     sizeof(vf_rss_query_en),
1144                     &vf_rss_query_en) ||
1145             nla_put(skb, IFLA_VF_TRUST,
1146                     sizeof(vf_trust), &vf_trust))
1147                 return -EMSGSIZE;
1148         memset(&vf_stats, 0, sizeof(vf_stats));
1149         if (dev->netdev_ops->ndo_get_vf_stats)
1150                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1151                                                 &vf_stats);
1152         vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1153         if (!vfstats) {
1154                 nla_nest_cancel(skb, vf);
1155                 nla_nest_cancel(skb, vfinfo);
1156                 return -EMSGSIZE;
1157         }
1158         if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS,
1159                         vf_stats.rx_packets) ||
1160             nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS,
1161                         vf_stats.tx_packets) ||
1162             nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES,
1163                         vf_stats.rx_bytes) ||
1164             nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES,
1165                         vf_stats.tx_bytes) ||
1166             nla_put_u64(skb, IFLA_VF_STATS_BROADCAST,
1167                         vf_stats.broadcast) ||
1168             nla_put_u64(skb, IFLA_VF_STATS_MULTICAST,
1169                         vf_stats.multicast))
1170                 return -EMSGSIZE;
1171         nla_nest_end(skb, vfstats);
1172         nla_nest_end(skb, vf);
1173         return 0;
1174 }
1175
1176 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1177 {
1178         struct rtnl_link_ifmap map;
1179
1180         memset(&map, 0, sizeof(map));
1181         map.mem_start   = dev->mem_start;
1182         map.mem_end     = dev->mem_end;
1183         map.base_addr   = dev->base_addr;
1184         map.irq         = dev->irq;
1185         map.dma         = dev->dma;
1186         map.port        = dev->if_port;
1187
1188         if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1189                 return -EMSGSIZE;
1190
1191         return 0;
1192 }
1193
1194 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1195                             int type, u32 pid, u32 seq, u32 change,
1196                             unsigned int flags, u32 ext_filter_mask)
1197 {
1198         struct ifinfomsg *ifm;
1199         struct nlmsghdr *nlh;
1200         struct nlattr *af_spec;
1201         struct rtnl_af_ops *af_ops;
1202         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1203
1204         ASSERT_RTNL();
1205         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1206         if (nlh == NULL)
1207                 return -EMSGSIZE;
1208
1209         ifm = nlmsg_data(nlh);
1210         ifm->ifi_family = AF_UNSPEC;
1211         ifm->__ifi_pad = 0;
1212         ifm->ifi_type = dev->type;
1213         ifm->ifi_index = dev->ifindex;
1214         ifm->ifi_flags = dev_get_flags(dev);
1215         ifm->ifi_change = change;
1216
1217         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1218             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1219             nla_put_u8(skb, IFLA_OPERSTATE,
1220                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1221             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1222             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1223             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1224             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1225             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1226 #ifdef CONFIG_RPS
1227             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1228 #endif
1229             (dev->ifindex != dev_get_iflink(dev) &&
1230              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1231             (upper_dev &&
1232              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1233             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1234             (dev->qdisc &&
1235              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1236             (dev->ifalias &&
1237              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1238             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1239                         atomic_read(&dev->carrier_changes)) ||
1240             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1241                 goto nla_put_failure;
1242
1243         if (rtnl_fill_link_ifmap(skb, dev))
1244                 goto nla_put_failure;
1245
1246         if (dev->addr_len) {
1247                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1248                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1249                         goto nla_put_failure;
1250         }
1251
1252         if (rtnl_phys_port_id_fill(skb, dev))
1253                 goto nla_put_failure;
1254
1255         if (rtnl_phys_port_name_fill(skb, dev))
1256                 goto nla_put_failure;
1257
1258         if (rtnl_phys_switch_id_fill(skb, dev))
1259                 goto nla_put_failure;
1260
1261         if (rtnl_fill_stats(skb, dev))
1262                 goto nla_put_failure;
1263
1264         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1265             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1266                 goto nla_put_failure;
1267
1268         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent &&
1269             ext_filter_mask & RTEXT_FILTER_VF) {
1270                 int i;
1271                 struct nlattr *vfinfo;
1272                 int num_vfs = dev_num_vf(dev->dev.parent);
1273
1274                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1275                 if (!vfinfo)
1276                         goto nla_put_failure;
1277                 for (i = 0; i < num_vfs; i++) {
1278                         if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1279                                 goto nla_put_failure;
1280                 }
1281
1282                 nla_nest_end(skb, vfinfo);
1283         }
1284
1285         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1286                 goto nla_put_failure;
1287
1288         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1289                 if (rtnl_link_fill(skb, dev) < 0)
1290                         goto nla_put_failure;
1291         }
1292
1293         if (dev->rtnl_link_ops &&
1294             dev->rtnl_link_ops->get_link_net) {
1295                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1296
1297                 if (!net_eq(dev_net(dev), link_net)) {
1298                         int id = peernet2id_alloc(dev_net(dev), link_net);
1299
1300                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1301                                 goto nla_put_failure;
1302                 }
1303         }
1304
1305         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1306                 goto nla_put_failure;
1307
1308         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1309                 if (af_ops->fill_link_af) {
1310                         struct nlattr *af;
1311                         int err;
1312
1313                         if (!(af = nla_nest_start(skb, af_ops->family)))
1314                                 goto nla_put_failure;
1315
1316                         err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1317
1318                         /*
1319                          * Caller may return ENODATA to indicate that there
1320                          * was no data to be dumped. This is not an error, it
1321                          * means we should trim the attribute header and
1322                          * continue.
1323                          */
1324                         if (err == -ENODATA)
1325                                 nla_nest_cancel(skb, af);
1326                         else if (err < 0)
1327                                 goto nla_put_failure;
1328
1329                         nla_nest_end(skb, af);
1330                 }
1331         }
1332
1333         nla_nest_end(skb, af_spec);
1334
1335         nlmsg_end(skb, nlh);
1336         return 0;
1337
1338 nla_put_failure:
1339         nlmsg_cancel(skb, nlh);
1340         return -EMSGSIZE;
1341 }
1342
1343 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1344         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1345         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1346         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1347         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1348         [IFLA_MTU]              = { .type = NLA_U32 },
1349         [IFLA_LINK]             = { .type = NLA_U32 },
1350         [IFLA_MASTER]           = { .type = NLA_U32 },
1351         [IFLA_CARRIER]          = { .type = NLA_U8 },
1352         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1353         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1354         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1355         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1356         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1357         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1358         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1359         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1360         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1361         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1362         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1363         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1364         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1365         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1366         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1367         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1368         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1369         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1370         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1371         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1372         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1373 };
1374
1375 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1376         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1377         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1378         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1379         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1380 };
1381
1382 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1383         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1384         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1385         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1386         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1387         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1388         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1389         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1390         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1391         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1392 };
1393
1394 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = {
1395         [IFLA_VF_STATS_RX_PACKETS]      = { .type = NLA_U64 },
1396         [IFLA_VF_STATS_TX_PACKETS]      = { .type = NLA_U64 },
1397         [IFLA_VF_STATS_RX_BYTES]        = { .type = NLA_U64 },
1398         [IFLA_VF_STATS_TX_BYTES]        = { .type = NLA_U64 },
1399         [IFLA_VF_STATS_BROADCAST]       = { .type = NLA_U64 },
1400         [IFLA_VF_STATS_MULTICAST]       = { .type = NLA_U64 },
1401 };
1402
1403 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1404         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1405         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1406                                     .len = PORT_PROFILE_MAX },
1407         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1408                                     .len = sizeof(struct ifla_port_vsi)},
1409         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1410                                       .len = PORT_UUID_MAX },
1411         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1412                                     .len = PORT_UUID_MAX },
1413         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1414         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1415 };
1416
1417 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1418 {
1419         struct net *net = sock_net(skb->sk);
1420         int h, s_h;
1421         int idx = 0, s_idx;
1422         struct net_device *dev;
1423         struct hlist_head *head;
1424         struct nlattr *tb[IFLA_MAX+1];
1425         u32 ext_filter_mask = 0;
1426         int err;
1427         int hdrlen;
1428
1429         s_h = cb->args[0];
1430         s_idx = cb->args[1];
1431
1432         cb->seq = net->dev_base_seq;
1433
1434         /* A hack to preserve kernel<->userspace interface.
1435          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1436          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1437          * what iproute2 < v3.9.0 used.
1438          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1439          * attribute, its netlink message is shorter than struct ifinfomsg.
1440          */
1441         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1442                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1443
1444         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1445
1446                 if (tb[IFLA_EXT_MASK])
1447                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1448         }
1449
1450         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1451                 idx = 0;
1452                 head = &net->dev_index_head[h];
1453                 hlist_for_each_entry(dev, head, index_hlist) {
1454                         if (idx < s_idx)
1455                                 goto cont;
1456                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1457                                                NETLINK_CB(cb->skb).portid,
1458                                                cb->nlh->nlmsg_seq, 0,
1459                                                NLM_F_MULTI,
1460                                                ext_filter_mask);
1461                         /* If we ran out of room on the first message,
1462                          * we're in trouble
1463                          */
1464                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1465
1466                         if (err < 0)
1467                                 goto out;
1468
1469                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1470 cont:
1471                         idx++;
1472                 }
1473         }
1474 out:
1475         cb->args[1] = idx;
1476         cb->args[0] = h;
1477
1478         return skb->len;
1479 }
1480
1481 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1482 {
1483         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1484 }
1485 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1486
1487 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1488 {
1489         struct net *net;
1490         /* Examine the link attributes and figure out which
1491          * network namespace we are talking about.
1492          */
1493         if (tb[IFLA_NET_NS_PID])
1494                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1495         else if (tb[IFLA_NET_NS_FD])
1496                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1497         else
1498                 net = get_net(src_net);
1499         return net;
1500 }
1501 EXPORT_SYMBOL(rtnl_link_get_net);
1502
1503 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1504 {
1505         if (dev) {
1506                 if (tb[IFLA_ADDRESS] &&
1507                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1508                         return -EINVAL;
1509
1510                 if (tb[IFLA_BROADCAST] &&
1511                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1512                         return -EINVAL;
1513         }
1514
1515         if (tb[IFLA_AF_SPEC]) {
1516                 struct nlattr *af;
1517                 int rem, err;
1518
1519                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1520                         const struct rtnl_af_ops *af_ops;
1521
1522                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1523                                 return -EAFNOSUPPORT;
1524
1525                         if (!af_ops->set_link_af)
1526                                 return -EOPNOTSUPP;
1527
1528                         if (af_ops->validate_link_af) {
1529                                 err = af_ops->validate_link_af(dev, af);
1530                                 if (err < 0)
1531                                         return err;
1532                         }
1533                 }
1534         }
1535
1536         return 0;
1537 }
1538
1539 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1540 {
1541         const struct net_device_ops *ops = dev->netdev_ops;
1542         int err = -EINVAL;
1543
1544         if (tb[IFLA_VF_MAC]) {
1545                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1546
1547                 err = -EOPNOTSUPP;
1548                 if (ops->ndo_set_vf_mac)
1549                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
1550                                                   ivm->mac);
1551                 if (err < 0)
1552                         return err;
1553         }
1554
1555         if (tb[IFLA_VF_VLAN]) {
1556                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1557
1558                 err = -EOPNOTSUPP;
1559                 if (ops->ndo_set_vf_vlan)
1560                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1561                                                    ivv->qos);
1562                 if (err < 0)
1563                         return err;
1564         }
1565
1566         if (tb[IFLA_VF_TX_RATE]) {
1567                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1568                 struct ifla_vf_info ivf;
1569
1570                 err = -EOPNOTSUPP;
1571                 if (ops->ndo_get_vf_config)
1572                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1573                 if (err < 0)
1574                         return err;
1575
1576                 err = -EOPNOTSUPP;
1577                 if (ops->ndo_set_vf_rate)
1578                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1579                                                    ivf.min_tx_rate,
1580                                                    ivt->rate);
1581                 if (err < 0)
1582                         return err;
1583         }
1584
1585         if (tb[IFLA_VF_RATE]) {
1586                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1587
1588                 err = -EOPNOTSUPP;
1589                 if (ops->ndo_set_vf_rate)
1590                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1591                                                    ivt->min_tx_rate,
1592                                                    ivt->max_tx_rate);
1593                 if (err < 0)
1594                         return err;
1595         }
1596
1597         if (tb[IFLA_VF_SPOOFCHK]) {
1598                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1599
1600                 err = -EOPNOTSUPP;
1601                 if (ops->ndo_set_vf_spoofchk)
1602                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1603                                                        ivs->setting);
1604                 if (err < 0)
1605                         return err;
1606         }
1607
1608         if (tb[IFLA_VF_LINK_STATE]) {
1609                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1610
1611                 err = -EOPNOTSUPP;
1612                 if (ops->ndo_set_vf_link_state)
1613                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1614                                                          ivl->link_state);
1615                 if (err < 0)
1616                         return err;
1617         }
1618
1619         if (tb[IFLA_VF_RSS_QUERY_EN]) {
1620                 struct ifla_vf_rss_query_en *ivrssq_en;
1621
1622                 err = -EOPNOTSUPP;
1623                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1624                 if (ops->ndo_set_vf_rss_query_en)
1625                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1626                                                            ivrssq_en->setting);
1627                 if (err < 0)
1628                         return err;
1629         }
1630
1631         if (tb[IFLA_VF_TRUST]) {
1632                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1633
1634                 err = -EOPNOTSUPP;
1635                 if (ops->ndo_set_vf_trust)
1636                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1637                 if (err < 0)
1638                         return err;
1639         }
1640
1641         return err;
1642 }
1643
1644 static int do_set_master(struct net_device *dev, int ifindex)
1645 {
1646         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1647         const struct net_device_ops *ops;
1648         int err;
1649
1650         if (upper_dev) {
1651                 if (upper_dev->ifindex == ifindex)
1652                         return 0;
1653                 ops = upper_dev->netdev_ops;
1654                 if (ops->ndo_del_slave) {
1655                         err = ops->ndo_del_slave(upper_dev, dev);
1656                         if (err)
1657                                 return err;
1658                 } else {
1659                         return -EOPNOTSUPP;
1660                 }
1661         }
1662
1663         if (ifindex) {
1664                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1665                 if (!upper_dev)
1666                         return -EINVAL;
1667                 ops = upper_dev->netdev_ops;
1668                 if (ops->ndo_add_slave) {
1669                         err = ops->ndo_add_slave(upper_dev, dev);
1670                         if (err)
1671                                 return err;
1672                 } else {
1673                         return -EOPNOTSUPP;
1674                 }
1675         }
1676         return 0;
1677 }
1678
1679 #define DO_SETLINK_MODIFIED     0x01
1680 /* notify flag means notify + modified. */
1681 #define DO_SETLINK_NOTIFY       0x03
1682 static int do_setlink(const struct sk_buff *skb,
1683                       struct net_device *dev, struct ifinfomsg *ifm,
1684                       struct nlattr **tb, char *ifname, int status)
1685 {
1686         const struct net_device_ops *ops = dev->netdev_ops;
1687         int err;
1688
1689         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1690                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1691                 if (IS_ERR(net)) {
1692                         err = PTR_ERR(net);
1693                         goto errout;
1694                 }
1695                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1696                         put_net(net);
1697                         err = -EPERM;
1698                         goto errout;
1699                 }
1700                 err = dev_change_net_namespace(dev, net, ifname);
1701                 put_net(net);
1702                 if (err)
1703                         goto errout;
1704                 status |= DO_SETLINK_MODIFIED;
1705         }
1706
1707         if (tb[IFLA_MAP]) {
1708                 struct rtnl_link_ifmap *u_map;
1709                 struct ifmap k_map;
1710
1711                 if (!ops->ndo_set_config) {
1712                         err = -EOPNOTSUPP;
1713                         goto errout;
1714                 }
1715
1716                 if (!netif_device_present(dev)) {
1717                         err = -ENODEV;
1718                         goto errout;
1719                 }
1720
1721                 u_map = nla_data(tb[IFLA_MAP]);
1722                 k_map.mem_start = (unsigned long) u_map->mem_start;
1723                 k_map.mem_end = (unsigned long) u_map->mem_end;
1724                 k_map.base_addr = (unsigned short) u_map->base_addr;
1725                 k_map.irq = (unsigned char) u_map->irq;
1726                 k_map.dma = (unsigned char) u_map->dma;
1727                 k_map.port = (unsigned char) u_map->port;
1728
1729                 err = ops->ndo_set_config(dev, &k_map);
1730                 if (err < 0)
1731                         goto errout;
1732
1733                 status |= DO_SETLINK_NOTIFY;
1734         }
1735
1736         if (tb[IFLA_ADDRESS]) {
1737                 struct sockaddr *sa;
1738                 int len;
1739
1740                 len = sizeof(sa_family_t) + dev->addr_len;
1741                 sa = kmalloc(len, GFP_KERNEL);
1742                 if (!sa) {
1743                         err = -ENOMEM;
1744                         goto errout;
1745                 }
1746                 sa->sa_family = dev->type;
1747                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1748                        dev->addr_len);
1749                 err = dev_set_mac_address(dev, sa);
1750                 kfree(sa);
1751                 if (err)
1752                         goto errout;
1753                 status |= DO_SETLINK_MODIFIED;
1754         }
1755
1756         if (tb[IFLA_MTU]) {
1757                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1758                 if (err < 0)
1759                         goto errout;
1760                 status |= DO_SETLINK_MODIFIED;
1761         }
1762
1763         if (tb[IFLA_GROUP]) {
1764                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1765                 status |= DO_SETLINK_NOTIFY;
1766         }
1767
1768         /*
1769          * Interface selected by interface index but interface
1770          * name provided implies that a name change has been
1771          * requested.
1772          */
1773         if (ifm->ifi_index > 0 && ifname[0]) {
1774                 err = dev_change_name(dev, ifname);
1775                 if (err < 0)
1776                         goto errout;
1777                 status |= DO_SETLINK_MODIFIED;
1778         }
1779
1780         if (tb[IFLA_IFALIAS]) {
1781                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1782                                     nla_len(tb[IFLA_IFALIAS]));
1783                 if (err < 0)
1784                         goto errout;
1785                 status |= DO_SETLINK_NOTIFY;
1786         }
1787
1788         if (tb[IFLA_BROADCAST]) {
1789                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1790                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1791         }
1792
1793         if (ifm->ifi_flags || ifm->ifi_change) {
1794                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1795                 if (err < 0)
1796                         goto errout;
1797         }
1798
1799         if (tb[IFLA_MASTER]) {
1800                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1801                 if (err)
1802                         goto errout;
1803                 status |= DO_SETLINK_MODIFIED;
1804         }
1805
1806         if (tb[IFLA_CARRIER]) {
1807                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1808                 if (err)
1809                         goto errout;
1810                 status |= DO_SETLINK_MODIFIED;
1811         }
1812
1813         if (tb[IFLA_TXQLEN]) {
1814                 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1815
1816                 if (dev->tx_queue_len ^ value)
1817                         status |= DO_SETLINK_NOTIFY;
1818
1819                 dev->tx_queue_len = value;
1820         }
1821
1822         if (tb[IFLA_OPERSTATE])
1823                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1824
1825         if (tb[IFLA_LINKMODE]) {
1826                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1827
1828                 write_lock_bh(&dev_base_lock);
1829                 if (dev->link_mode ^ value)
1830                         status |= DO_SETLINK_NOTIFY;
1831                 dev->link_mode = value;
1832                 write_unlock_bh(&dev_base_lock);
1833         }
1834
1835         if (tb[IFLA_VFINFO_LIST]) {
1836                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
1837                 struct nlattr *attr;
1838                 int rem;
1839
1840                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1841                         if (nla_type(attr) != IFLA_VF_INFO ||
1842                             nla_len(attr) < NLA_HDRLEN) {
1843                                 err = -EINVAL;
1844                                 goto errout;
1845                         }
1846                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
1847                                                ifla_vf_policy);
1848                         if (err < 0)
1849                                 goto errout;
1850                         err = do_setvfinfo(dev, vfinfo);
1851                         if (err < 0)
1852                                 goto errout;
1853                         status |= DO_SETLINK_NOTIFY;
1854                 }
1855         }
1856         err = 0;
1857
1858         if (tb[IFLA_VF_PORTS]) {
1859                 struct nlattr *port[IFLA_PORT_MAX+1];
1860                 struct nlattr *attr;
1861                 int vf;
1862                 int rem;
1863
1864                 err = -EOPNOTSUPP;
1865                 if (!ops->ndo_set_vf_port)
1866                         goto errout;
1867
1868                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1869                         if (nla_type(attr) != IFLA_VF_PORT ||
1870                             nla_len(attr) < NLA_HDRLEN) {
1871                                 err = -EINVAL;
1872                                 goto errout;
1873                         }
1874                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
1875                                                ifla_port_policy);
1876                         if (err < 0)
1877                                 goto errout;
1878                         if (!port[IFLA_PORT_VF]) {
1879                                 err = -EOPNOTSUPP;
1880                                 goto errout;
1881                         }
1882                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1883                         err = ops->ndo_set_vf_port(dev, vf, port);
1884                         if (err < 0)
1885                                 goto errout;
1886                         status |= DO_SETLINK_NOTIFY;
1887                 }
1888         }
1889         err = 0;
1890
1891         if (tb[IFLA_PORT_SELF]) {
1892                 struct nlattr *port[IFLA_PORT_MAX+1];
1893
1894                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1895                         tb[IFLA_PORT_SELF], ifla_port_policy);
1896                 if (err < 0)
1897                         goto errout;
1898
1899                 err = -EOPNOTSUPP;
1900                 if (ops->ndo_set_vf_port)
1901                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1902                 if (err < 0)
1903                         goto errout;
1904                 status |= DO_SETLINK_NOTIFY;
1905         }
1906
1907         if (tb[IFLA_AF_SPEC]) {
1908                 struct nlattr *af;
1909                 int rem;
1910
1911                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1912                         const struct rtnl_af_ops *af_ops;
1913
1914                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1915                                 BUG();
1916
1917                         err = af_ops->set_link_af(dev, af);
1918                         if (err < 0)
1919                                 goto errout;
1920
1921                         status |= DO_SETLINK_NOTIFY;
1922                 }
1923         }
1924         err = 0;
1925
1926         if (tb[IFLA_PROTO_DOWN]) {
1927                 err = dev_change_proto_down(dev,
1928                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
1929                 if (err)
1930                         goto errout;
1931                 status |= DO_SETLINK_NOTIFY;
1932         }
1933
1934 errout:
1935         if (status & DO_SETLINK_MODIFIED) {
1936                 if (status & DO_SETLINK_NOTIFY)
1937                         netdev_state_change(dev);
1938
1939                 if (err < 0)
1940                         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",
1941                                              dev->name);
1942         }
1943
1944         return err;
1945 }
1946
1947 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1948 {
1949         struct net *net = sock_net(skb->sk);
1950         struct ifinfomsg *ifm;
1951         struct net_device *dev;
1952         int err;
1953         struct nlattr *tb[IFLA_MAX+1];
1954         char ifname[IFNAMSIZ];
1955
1956         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1957         if (err < 0)
1958                 goto errout;
1959
1960         if (tb[IFLA_IFNAME])
1961                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1962         else
1963                 ifname[0] = '\0';
1964
1965         err = -EINVAL;
1966         ifm = nlmsg_data(nlh);
1967         if (ifm->ifi_index > 0)
1968                 dev = __dev_get_by_index(net, ifm->ifi_index);
1969         else if (tb[IFLA_IFNAME])
1970                 dev = __dev_get_by_name(net, ifname);
1971         else
1972                 goto errout;
1973
1974         if (dev == NULL) {
1975                 err = -ENODEV;
1976                 goto errout;
1977         }
1978
1979         err = validate_linkmsg(dev, tb);
1980         if (err < 0)
1981                 goto errout;
1982
1983         err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1984 errout:
1985         return err;
1986 }
1987
1988 static int rtnl_group_dellink(const struct net *net, int group)
1989 {
1990         struct net_device *dev, *aux;
1991         LIST_HEAD(list_kill);
1992         bool found = false;
1993
1994         if (!group)
1995                 return -EPERM;
1996
1997         for_each_netdev(net, dev) {
1998                 if (dev->group == group) {
1999                         const struct rtnl_link_ops *ops;
2000
2001                         found = true;
2002                         ops = dev->rtnl_link_ops;
2003                         if (!ops || !ops->dellink)
2004                                 return -EOPNOTSUPP;
2005                 }
2006         }
2007
2008         if (!found)
2009                 return -ENODEV;
2010
2011         for_each_netdev_safe(net, dev, aux) {
2012                 if (dev->group == group) {
2013                         const struct rtnl_link_ops *ops;
2014
2015                         ops = dev->rtnl_link_ops;
2016                         ops->dellink(dev, &list_kill);
2017                 }
2018         }
2019         unregister_netdevice_many(&list_kill);
2020
2021         return 0;
2022 }
2023
2024 int rtnl_delete_link(struct net_device *dev)
2025 {
2026         const struct rtnl_link_ops *ops;
2027         LIST_HEAD(list_kill);
2028
2029         ops = dev->rtnl_link_ops;
2030         if (!ops || !ops->dellink)
2031                 return -EOPNOTSUPP;
2032
2033         ops->dellink(dev, &list_kill);
2034         unregister_netdevice_many(&list_kill);
2035
2036         return 0;
2037 }
2038 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2039
2040 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2041 {
2042         struct net *net = sock_net(skb->sk);
2043         struct net_device *dev;
2044         struct ifinfomsg *ifm;
2045         char ifname[IFNAMSIZ];
2046         struct nlattr *tb[IFLA_MAX+1];
2047         int err;
2048
2049         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2050         if (err < 0)
2051                 return err;
2052
2053         if (tb[IFLA_IFNAME])
2054                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2055
2056         ifm = nlmsg_data(nlh);
2057         if (ifm->ifi_index > 0)
2058                 dev = __dev_get_by_index(net, ifm->ifi_index);
2059         else if (tb[IFLA_IFNAME])
2060                 dev = __dev_get_by_name(net, ifname);
2061         else if (tb[IFLA_GROUP])
2062                 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2063         else
2064                 return -EINVAL;
2065
2066         if (!dev)
2067                 return -ENODEV;
2068
2069         return rtnl_delete_link(dev);
2070 }
2071
2072 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2073 {
2074         unsigned int old_flags;
2075         int err;
2076
2077         old_flags = dev->flags;
2078         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2079                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2080                 if (err < 0)
2081                         return err;
2082         }
2083
2084         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2085
2086         __dev_notify_flags(dev, old_flags, ~0U);
2087         return 0;
2088 }
2089 EXPORT_SYMBOL(rtnl_configure_link);
2090
2091 struct net_device *rtnl_create_link(struct net *net,
2092         const char *ifname, unsigned char name_assign_type,
2093         const struct rtnl_link_ops *ops, struct nlattr *tb[])
2094 {
2095         int err;
2096         struct net_device *dev;
2097         unsigned int num_tx_queues = 1;
2098         unsigned int num_rx_queues = 1;
2099
2100         if (tb[IFLA_NUM_TX_QUEUES])
2101                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2102         else if (ops->get_num_tx_queues)
2103                 num_tx_queues = ops->get_num_tx_queues();
2104
2105         if (tb[IFLA_NUM_RX_QUEUES])
2106                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2107         else if (ops->get_num_rx_queues)
2108                 num_rx_queues = ops->get_num_rx_queues();
2109
2110         err = -ENOMEM;
2111         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2112                                ops->setup, num_tx_queues, num_rx_queues);
2113         if (!dev)
2114                 goto err;
2115
2116         dev_net_set(dev, net);
2117         dev->rtnl_link_ops = ops;
2118         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2119
2120         if (tb[IFLA_MTU])
2121                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2122         if (tb[IFLA_ADDRESS]) {
2123                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2124                                 nla_len(tb[IFLA_ADDRESS]));
2125                 dev->addr_assign_type = NET_ADDR_SET;
2126         }
2127         if (tb[IFLA_BROADCAST])
2128                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2129                                 nla_len(tb[IFLA_BROADCAST]));
2130         if (tb[IFLA_TXQLEN])
2131                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2132         if (tb[IFLA_OPERSTATE])
2133                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2134         if (tb[IFLA_LINKMODE])
2135                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2136         if (tb[IFLA_GROUP])
2137                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2138
2139         return dev;
2140
2141 err:
2142         return ERR_PTR(err);
2143 }
2144 EXPORT_SYMBOL(rtnl_create_link);
2145
2146 static int rtnl_group_changelink(const struct sk_buff *skb,
2147                 struct net *net, int group,
2148                 struct ifinfomsg *ifm,
2149                 struct nlattr **tb)
2150 {
2151         struct net_device *dev, *aux;
2152         int err;
2153
2154         for_each_netdev_safe(net, dev, aux) {
2155                 if (dev->group == group) {
2156                         err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2157                         if (err < 0)
2158                                 return err;
2159                 }
2160         }
2161
2162         return 0;
2163 }
2164
2165 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2166 {
2167         struct net *net = sock_net(skb->sk);
2168         const struct rtnl_link_ops *ops;
2169         const struct rtnl_link_ops *m_ops = NULL;
2170         struct net_device *dev;
2171         struct net_device *master_dev = NULL;
2172         struct ifinfomsg *ifm;
2173         char kind[MODULE_NAME_LEN];
2174         char ifname[IFNAMSIZ];
2175         struct nlattr *tb[IFLA_MAX+1];
2176         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2177         unsigned char name_assign_type = NET_NAME_USER;
2178         int err;
2179
2180 #ifdef CONFIG_MODULES
2181 replay:
2182 #endif
2183         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2184         if (err < 0)
2185                 return err;
2186
2187         if (tb[IFLA_IFNAME])
2188                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2189         else
2190                 ifname[0] = '\0';
2191
2192         ifm = nlmsg_data(nlh);
2193         if (ifm->ifi_index > 0)
2194                 dev = __dev_get_by_index(net, ifm->ifi_index);
2195         else {
2196                 if (ifname[0])
2197                         dev = __dev_get_by_name(net, ifname);
2198                 else
2199                         dev = NULL;
2200         }
2201
2202         if (dev) {
2203                 master_dev = netdev_master_upper_dev_get(dev);
2204                 if (master_dev)
2205                         m_ops = master_dev->rtnl_link_ops;
2206         }
2207
2208         err = validate_linkmsg(dev, tb);
2209         if (err < 0)
2210                 return err;
2211
2212         if (tb[IFLA_LINKINFO]) {
2213                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2214                                        tb[IFLA_LINKINFO], ifla_info_policy);
2215                 if (err < 0)
2216                         return err;
2217         } else
2218                 memset(linkinfo, 0, sizeof(linkinfo));
2219
2220         if (linkinfo[IFLA_INFO_KIND]) {
2221                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2222                 ops = rtnl_link_ops_get(kind);
2223         } else {
2224                 kind[0] = '\0';
2225                 ops = NULL;
2226         }
2227
2228         if (1) {
2229                 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2230                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2231                 struct nlattr **data = NULL;
2232                 struct nlattr **slave_data = NULL;
2233                 struct net *dest_net, *link_net = NULL;
2234
2235                 if (ops) {
2236                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2237                                 err = nla_parse_nested(attr, ops->maxtype,
2238                                                        linkinfo[IFLA_INFO_DATA],
2239                                                        ops->policy);
2240                                 if (err < 0)
2241                                         return err;
2242                                 data = attr;
2243                         }
2244                         if (ops->validate) {
2245                                 err = ops->validate(tb, data);
2246                                 if (err < 0)
2247                                         return err;
2248                         }
2249                 }
2250
2251                 if (m_ops) {
2252                         if (m_ops->slave_maxtype &&
2253                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2254                                 err = nla_parse_nested(slave_attr,
2255                                                        m_ops->slave_maxtype,
2256                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2257                                                        m_ops->slave_policy);
2258                                 if (err < 0)
2259                                         return err;
2260                                 slave_data = slave_attr;
2261                         }
2262                         if (m_ops->slave_validate) {
2263                                 err = m_ops->slave_validate(tb, slave_data);
2264                                 if (err < 0)
2265                                         return err;
2266                         }
2267                 }
2268
2269                 if (dev) {
2270                         int status = 0;
2271
2272                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2273                                 return -EEXIST;
2274                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2275                                 return -EOPNOTSUPP;
2276
2277                         if (linkinfo[IFLA_INFO_DATA]) {
2278                                 if (!ops || ops != dev->rtnl_link_ops ||
2279                                     !ops->changelink)
2280                                         return -EOPNOTSUPP;
2281
2282                                 err = ops->changelink(dev, tb, data);
2283                                 if (err < 0)
2284                                         return err;
2285                                 status |= DO_SETLINK_NOTIFY;
2286                         }
2287
2288                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2289                                 if (!m_ops || !m_ops->slave_changelink)
2290                                         return -EOPNOTSUPP;
2291
2292                                 err = m_ops->slave_changelink(master_dev, dev,
2293                                                               tb, slave_data);
2294                                 if (err < 0)
2295                                         return err;
2296                                 status |= DO_SETLINK_NOTIFY;
2297                         }
2298
2299                         return do_setlink(skb, dev, ifm, tb, ifname, status);
2300                 }
2301
2302                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2303                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2304                                 return rtnl_group_changelink(skb, net,
2305                                                 nla_get_u32(tb[IFLA_GROUP]),
2306                                                 ifm, tb);
2307                         return -ENODEV;
2308                 }
2309
2310                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2311                         return -EOPNOTSUPP;
2312
2313                 if (!ops) {
2314 #ifdef CONFIG_MODULES
2315                         if (kind[0]) {
2316                                 __rtnl_unlock();
2317                                 request_module("rtnl-link-%s", kind);
2318                                 rtnl_lock();
2319                                 ops = rtnl_link_ops_get(kind);
2320                                 if (ops)
2321                                         goto replay;
2322                         }
2323 #endif
2324                         return -EOPNOTSUPP;
2325                 }
2326
2327                 if (!ops->setup)
2328                         return -EOPNOTSUPP;
2329
2330                 if (!ifname[0]) {
2331                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2332                         name_assign_type = NET_NAME_ENUM;
2333                 }
2334
2335                 dest_net = rtnl_link_get_net(net, tb);
2336                 if (IS_ERR(dest_net))
2337                         return PTR_ERR(dest_net);
2338
2339                 err = -EPERM;
2340                 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2341                         goto out;
2342
2343                 if (tb[IFLA_LINK_NETNSID]) {
2344                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2345
2346                         link_net = get_net_ns_by_id(dest_net, id);
2347                         if (!link_net) {
2348                                 err =  -EINVAL;
2349                                 goto out;
2350                         }
2351                         err = -EPERM;
2352                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2353                                 goto out;
2354                 }
2355
2356                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2357                                        name_assign_type, ops, tb);
2358                 if (IS_ERR(dev)) {
2359                         err = PTR_ERR(dev);
2360                         goto out;
2361                 }
2362
2363                 dev->ifindex = ifm->ifi_index;
2364
2365                 if (ops->newlink) {
2366                         err = ops->newlink(link_net ? : net, dev, tb, data);
2367                         /* Drivers should call free_netdev() in ->destructor
2368                          * and unregister it on failure after registration
2369                          * so that device could be finally freed in rtnl_unlock.
2370                          */
2371                         if (err < 0) {
2372                                 /* If device is not registered at all, free it now */
2373                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2374                                         free_netdev(dev);
2375                                 goto out;
2376                         }
2377                 } else {
2378                         err = register_netdevice(dev);
2379                         if (err < 0) {
2380                                 free_netdev(dev);
2381                                 goto out;
2382                         }
2383                 }
2384                 err = rtnl_configure_link(dev, ifm);
2385                 if (err < 0)
2386                         goto out_unregister;
2387                 if (link_net) {
2388                         err = dev_change_net_namespace(dev, dest_net, ifname);
2389                         if (err < 0)
2390                                 goto out_unregister;
2391                 }
2392 out:
2393                 if (link_net)
2394                         put_net(link_net);
2395                 put_net(dest_net);
2396                 return err;
2397 out_unregister:
2398                 if (ops->newlink) {
2399                         LIST_HEAD(list_kill);
2400
2401                         ops->dellink(dev, &list_kill);
2402                         unregister_netdevice_many(&list_kill);
2403                 } else {
2404                         unregister_netdevice(dev);
2405                 }
2406                 goto out;
2407         }
2408 }
2409
2410 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2411 {
2412         struct net *net = sock_net(skb->sk);
2413         struct ifinfomsg *ifm;
2414         char ifname[IFNAMSIZ];
2415         struct nlattr *tb[IFLA_MAX+1];
2416         struct net_device *dev = NULL;
2417         struct sk_buff *nskb;
2418         int err;
2419         u32 ext_filter_mask = 0;
2420
2421         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2422         if (err < 0)
2423                 return err;
2424
2425         if (tb[IFLA_IFNAME])
2426                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2427
2428         if (tb[IFLA_EXT_MASK])
2429                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2430
2431         ifm = nlmsg_data(nlh);
2432         if (ifm->ifi_index > 0)
2433                 dev = __dev_get_by_index(net, ifm->ifi_index);
2434         else if (tb[IFLA_IFNAME])
2435                 dev = __dev_get_by_name(net, ifname);
2436         else
2437                 return -EINVAL;
2438
2439         if (dev == NULL)
2440                 return -ENODEV;
2441
2442         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2443         if (nskb == NULL)
2444                 return -ENOBUFS;
2445
2446         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2447                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2448         if (err < 0) {
2449                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2450                 WARN_ON(err == -EMSGSIZE);
2451                 kfree_skb(nskb);
2452         } else
2453                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2454
2455         return err;
2456 }
2457
2458 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2459 {
2460         struct net *net = sock_net(skb->sk);
2461         struct net_device *dev;
2462         struct nlattr *tb[IFLA_MAX+1];
2463         u32 ext_filter_mask = 0;
2464         u16 min_ifinfo_dump_size = 0;
2465         int hdrlen;
2466
2467         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2468         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2469                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2470
2471         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2472                 if (tb[IFLA_EXT_MASK])
2473                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2474         }
2475
2476         if (!ext_filter_mask)
2477                 return NLMSG_GOODSIZE;
2478         /*
2479          * traverse the list of net devices and compute the minimum
2480          * buffer size based upon the filter mask.
2481          */
2482         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2483                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2484                                              if_nlmsg_size(dev,
2485                                                            ext_filter_mask));
2486         }
2487
2488         return min_ifinfo_dump_size;
2489 }
2490
2491 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2492 {
2493         int idx;
2494         int s_idx = cb->family;
2495
2496         if (s_idx == 0)
2497                 s_idx = 1;
2498         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2499                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2500                 if (idx < s_idx || idx == PF_PACKET)
2501                         continue;
2502                 if (rtnl_msg_handlers[idx] == NULL ||
2503                     rtnl_msg_handlers[idx][type].dumpit == NULL)
2504                         continue;
2505                 if (idx > s_idx) {
2506                         memset(&cb->args[0], 0, sizeof(cb->args));
2507                         cb->prev_seq = 0;
2508                         cb->seq = 0;
2509                 }
2510                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2511                         break;
2512         }
2513         cb->family = idx;
2514
2515         return skb->len;
2516 }
2517
2518 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2519                                        unsigned int change, gfp_t flags)
2520 {
2521         struct net *net = dev_net(dev);
2522         struct sk_buff *skb;
2523         int err = -ENOBUFS;
2524         size_t if_info_size;
2525
2526         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2527         if (skb == NULL)
2528                 goto errout;
2529
2530         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2531         if (err < 0) {
2532                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2533                 WARN_ON(err == -EMSGSIZE);
2534                 kfree_skb(skb);
2535                 goto errout;
2536         }
2537         return skb;
2538 errout:
2539         if (err < 0)
2540                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2541         return NULL;
2542 }
2543
2544 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2545 {
2546         struct net *net = dev_net(dev);
2547
2548         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2549 }
2550
2551 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2552                   gfp_t flags)
2553 {
2554         struct sk_buff *skb;
2555
2556         if (dev->reg_state != NETREG_REGISTERED)
2557                 return;
2558
2559         skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2560         if (skb)
2561                 rtmsg_ifinfo_send(skb, dev, flags);
2562 }
2563 EXPORT_SYMBOL(rtmsg_ifinfo);
2564
2565 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2566                                    struct net_device *dev,
2567                                    u8 *addr, u16 vid, u32 pid, u32 seq,
2568                                    int type, unsigned int flags,
2569                                    int nlflags)
2570 {
2571         struct nlmsghdr *nlh;
2572         struct ndmsg *ndm;
2573
2574         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2575         if (!nlh)
2576                 return -EMSGSIZE;
2577
2578         ndm = nlmsg_data(nlh);
2579         ndm->ndm_family  = AF_BRIDGE;
2580         ndm->ndm_pad1    = 0;
2581         ndm->ndm_pad2    = 0;
2582         ndm->ndm_flags   = flags;
2583         ndm->ndm_type    = 0;
2584         ndm->ndm_ifindex = dev->ifindex;
2585         ndm->ndm_state   = NUD_PERMANENT;
2586
2587         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2588                 goto nla_put_failure;
2589         if (vid)
2590                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2591                         goto nla_put_failure;
2592
2593         nlmsg_end(skb, nlh);
2594         return 0;
2595
2596 nla_put_failure:
2597         nlmsg_cancel(skb, nlh);
2598         return -EMSGSIZE;
2599 }
2600
2601 static inline size_t rtnl_fdb_nlmsg_size(void)
2602 {
2603         return NLMSG_ALIGN(sizeof(struct ndmsg)) +
2604                nla_total_size(ETH_ALEN) +       /* NDA_LLADDR */
2605                nla_total_size(sizeof(u16)) +    /* NDA_VLAN */
2606                0;
2607 }
2608
2609 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type)
2610 {
2611         struct net *net = dev_net(dev);
2612         struct sk_buff *skb;
2613         int err = -ENOBUFS;
2614
2615         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2616         if (!skb)
2617                 goto errout;
2618
2619         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2620                                       0, 0, type, NTF_SELF, 0);
2621         if (err < 0) {
2622                 kfree_skb(skb);
2623                 goto errout;
2624         }
2625
2626         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2627         return;
2628 errout:
2629         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2630 }
2631
2632 /**
2633  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2634  */
2635 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2636                      struct nlattr *tb[],
2637                      struct net_device *dev,
2638                      const unsigned char *addr, u16 vid,
2639                      u16 flags)
2640 {
2641         int err = -EINVAL;
2642
2643         /* If aging addresses are supported device will need to
2644          * implement its own handler for this.
2645          */
2646         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2647                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2648                 return err;
2649         }
2650
2651         if (vid) {
2652                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2653                 return err;
2654         }
2655
2656         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2657                 err = dev_uc_add_excl(dev, addr);
2658         else if (is_multicast_ether_addr(addr))
2659                 err = dev_mc_add_excl(dev, addr);
2660
2661         /* Only return duplicate errors if NLM_F_EXCL is set */
2662         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2663                 err = 0;
2664
2665         return err;
2666 }
2667 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2668
2669 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2670 {
2671         u16 vid = 0;
2672
2673         if (vlan_attr) {
2674                 if (nla_len(vlan_attr) != sizeof(u16)) {
2675                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2676                         return -EINVAL;
2677                 }
2678
2679                 vid = nla_get_u16(vlan_attr);
2680
2681                 if (!vid || vid >= VLAN_VID_MASK) {
2682                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2683                                 vid);
2684                         return -EINVAL;
2685                 }
2686         }
2687         *p_vid = vid;
2688         return 0;
2689 }
2690
2691 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2692 {
2693         struct net *net = sock_net(skb->sk);
2694         struct ndmsg *ndm;
2695         struct nlattr *tb[NDA_MAX+1];
2696         struct net_device *dev;
2697         u8 *addr;
2698         u16 vid;
2699         int err;
2700
2701         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2702         if (err < 0)
2703                 return err;
2704
2705         ndm = nlmsg_data(nlh);
2706         if (ndm->ndm_ifindex == 0) {
2707                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2708                 return -EINVAL;
2709         }
2710
2711         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2712         if (dev == NULL) {
2713                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2714                 return -ENODEV;
2715         }
2716
2717         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2718                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2719                 return -EINVAL;
2720         }
2721
2722         addr = nla_data(tb[NDA_LLADDR]);
2723
2724         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2725         if (err)
2726                 return err;
2727
2728         err = -EOPNOTSUPP;
2729
2730         /* Support fdb on master device the net/bridge default case */
2731         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2732             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2733                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2734                 const struct net_device_ops *ops = br_dev->netdev_ops;
2735
2736                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2737                                        nlh->nlmsg_flags);
2738                 if (err)
2739                         goto out;
2740                 else
2741                         ndm->ndm_flags &= ~NTF_MASTER;
2742         }
2743
2744         /* Embedded bridge, macvlan, and any other device support */
2745         if ((ndm->ndm_flags & NTF_SELF)) {
2746                 if (dev->netdev_ops->ndo_fdb_add)
2747                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2748                                                            vid,
2749                                                            nlh->nlmsg_flags);
2750                 else
2751                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2752                                                nlh->nlmsg_flags);
2753
2754                 if (!err) {
2755                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH);
2756                         ndm->ndm_flags &= ~NTF_SELF;
2757                 }
2758         }
2759 out:
2760         return err;
2761 }
2762
2763 /**
2764  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2765  */
2766 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2767                      struct nlattr *tb[],
2768                      struct net_device *dev,
2769                      const unsigned char *addr, u16 vid)
2770 {
2771         int err = -EINVAL;
2772
2773         /* If aging addresses are supported device will need to
2774          * implement its own handler for this.
2775          */
2776         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2777                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2778                 return err;
2779         }
2780
2781         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2782                 err = dev_uc_del(dev, addr);
2783         else if (is_multicast_ether_addr(addr))
2784                 err = dev_mc_del(dev, addr);
2785
2786         return err;
2787 }
2788 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2789
2790 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2791 {
2792         struct net *net = sock_net(skb->sk);
2793         struct ndmsg *ndm;
2794         struct nlattr *tb[NDA_MAX+1];
2795         struct net_device *dev;
2796         int err = -EINVAL;
2797         __u8 *addr;
2798         u16 vid;
2799
2800         if (!netlink_capable(skb, CAP_NET_ADMIN))
2801                 return -EPERM;
2802
2803         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2804         if (err < 0)
2805                 return err;
2806
2807         ndm = nlmsg_data(nlh);
2808         if (ndm->ndm_ifindex == 0) {
2809                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2810                 return -EINVAL;
2811         }
2812
2813         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2814         if (dev == NULL) {
2815                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2816                 return -ENODEV;
2817         }
2818
2819         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2820                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2821                 return -EINVAL;
2822         }
2823
2824         addr = nla_data(tb[NDA_LLADDR]);
2825
2826         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2827         if (err)
2828                 return err;
2829
2830         err = -EOPNOTSUPP;
2831
2832         /* Support fdb on master device the net/bridge default case */
2833         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2834             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2835                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2836                 const struct net_device_ops *ops = br_dev->netdev_ops;
2837
2838                 if (ops->ndo_fdb_del)
2839                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
2840
2841                 if (err)
2842                         goto out;
2843                 else
2844                         ndm->ndm_flags &= ~NTF_MASTER;
2845         }
2846
2847         /* Embedded bridge, macvlan, and any other device support */
2848         if (ndm->ndm_flags & NTF_SELF) {
2849                 if (dev->netdev_ops->ndo_fdb_del)
2850                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
2851                                                            vid);
2852                 else
2853                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
2854
2855                 if (!err) {
2856                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH);
2857                         ndm->ndm_flags &= ~NTF_SELF;
2858                 }
2859         }
2860 out:
2861         return err;
2862 }
2863
2864 static int nlmsg_populate_fdb(struct sk_buff *skb,
2865                               struct netlink_callback *cb,
2866                               struct net_device *dev,
2867                               int *idx,
2868                               struct netdev_hw_addr_list *list)
2869 {
2870         struct netdev_hw_addr *ha;
2871         int err;
2872         u32 portid, seq;
2873
2874         portid = NETLINK_CB(cb->skb).portid;
2875         seq = cb->nlh->nlmsg_seq;
2876
2877         list_for_each_entry(ha, &list->list, list) {
2878                 if (*idx < cb->args[0])
2879                         goto skip;
2880
2881                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
2882                                               portid, seq,
2883                                               RTM_NEWNEIGH, NTF_SELF,
2884                                               NLM_F_MULTI);
2885                 if (err < 0)
2886                         return err;
2887 skip:
2888                 *idx += 1;
2889         }
2890         return 0;
2891 }
2892
2893 /**
2894  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2895  * @nlh: netlink message header
2896  * @dev: netdevice
2897  *
2898  * Default netdevice operation to dump the existing unicast address list.
2899  * Returns number of addresses from list put in skb.
2900  */
2901 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2902                       struct netlink_callback *cb,
2903                       struct net_device *dev,
2904                       struct net_device *filter_dev,
2905                       int idx)
2906 {
2907         int err;
2908
2909         netif_addr_lock_bh(dev);
2910         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2911         if (err)
2912                 goto out;
2913         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2914 out:
2915         netif_addr_unlock_bh(dev);
2916         return idx;
2917 }
2918 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2919
2920 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2921 {
2922         struct net_device *dev;
2923         struct nlattr *tb[IFLA_MAX+1];
2924         struct net_device *br_dev = NULL;
2925         const struct net_device_ops *ops = NULL;
2926         const struct net_device_ops *cops = NULL;
2927         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2928         struct net *net = sock_net(skb->sk);
2929         int brport_idx = 0;
2930         int br_idx = 0;
2931         int idx = 0;
2932
2933         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2934                         ifla_policy) == 0) {
2935                 if (tb[IFLA_MASTER])
2936                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
2937         }
2938
2939         brport_idx = ifm->ifi_index;
2940
2941         if (br_idx) {
2942                 br_dev = __dev_get_by_index(net, br_idx);
2943                 if (!br_dev)
2944                         return -ENODEV;
2945
2946                 ops = br_dev->netdev_ops;
2947         }
2948
2949         for_each_netdev(net, dev) {
2950                 if (brport_idx && (dev->ifindex != brport_idx))
2951                         continue;
2952
2953                 if (!br_idx) { /* user did not specify a specific bridge */
2954                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
2955                                 br_dev = netdev_master_upper_dev_get(dev);
2956                                 cops = br_dev->netdev_ops;
2957                         }
2958
2959                 } else {
2960                         if (dev != br_dev &&
2961                             !(dev->priv_flags & IFF_BRIDGE_PORT))
2962                                 continue;
2963
2964                         if (br_dev != netdev_master_upper_dev_get(dev) &&
2965                             !(dev->priv_flags & IFF_EBRIDGE))
2966                                 continue;
2967
2968                         cops = ops;
2969                 }
2970
2971                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2972                         if (cops && cops->ndo_fdb_dump)
2973                                 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2974                                                          idx);
2975                 }
2976
2977                 if (dev->netdev_ops->ndo_fdb_dump)
2978                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
2979                                                             idx);
2980                 else
2981                         idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2982
2983                 cops = NULL;
2984         }
2985
2986         cb->args[0] = idx;
2987         return skb->len;
2988 }
2989
2990 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
2991                                unsigned int attrnum, unsigned int flag)
2992 {
2993         if (mask & flag)
2994                 return nla_put_u8(skb, attrnum, !!(flags & flag));
2995         return 0;
2996 }
2997
2998 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2999                             struct net_device *dev, u16 mode,
3000                             u32 flags, u32 mask, int nlflags,
3001                             u32 filter_mask,
3002                             int (*vlan_fill)(struct sk_buff *skb,
3003                                              struct net_device *dev,
3004                                              u32 filter_mask))
3005 {
3006         struct nlmsghdr *nlh;
3007         struct ifinfomsg *ifm;
3008         struct nlattr *br_afspec;
3009         struct nlattr *protinfo;
3010         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3011         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3012         int err = 0;
3013
3014         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3015         if (nlh == NULL)
3016                 return -EMSGSIZE;
3017
3018         ifm = nlmsg_data(nlh);
3019         ifm->ifi_family = AF_BRIDGE;
3020         ifm->__ifi_pad = 0;
3021         ifm->ifi_type = dev->type;
3022         ifm->ifi_index = dev->ifindex;
3023         ifm->ifi_flags = dev_get_flags(dev);
3024         ifm->ifi_change = 0;
3025
3026
3027         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3028             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3029             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3030             (br_dev &&
3031              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3032             (dev->addr_len &&
3033              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3034             (dev->ifindex != dev_get_iflink(dev) &&
3035              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3036                 goto nla_put_failure;
3037
3038         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3039         if (!br_afspec)
3040                 goto nla_put_failure;
3041
3042         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3043                 nla_nest_cancel(skb, br_afspec);
3044                 goto nla_put_failure;
3045         }
3046
3047         if (mode != BRIDGE_MODE_UNDEF) {
3048                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3049                         nla_nest_cancel(skb, br_afspec);
3050                         goto nla_put_failure;
3051                 }
3052         }
3053         if (vlan_fill) {
3054                 err = vlan_fill(skb, dev, filter_mask);
3055                 if (err) {
3056                         nla_nest_cancel(skb, br_afspec);
3057                         goto nla_put_failure;
3058                 }
3059         }
3060         nla_nest_end(skb, br_afspec);
3061
3062         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3063         if (!protinfo)
3064                 goto nla_put_failure;
3065
3066         if (brport_nla_put_flag(skb, flags, mask,
3067                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3068             brport_nla_put_flag(skb, flags, mask,
3069                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3070             brport_nla_put_flag(skb, flags, mask,
3071                                 IFLA_BRPORT_FAST_LEAVE,
3072                                 BR_MULTICAST_FAST_LEAVE) ||
3073             brport_nla_put_flag(skb, flags, mask,
3074                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3075             brport_nla_put_flag(skb, flags, mask,
3076                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3077             brport_nla_put_flag(skb, flags, mask,
3078                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3079             brport_nla_put_flag(skb, flags, mask,
3080                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3081             brport_nla_put_flag(skb, flags, mask,
3082                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3083                 nla_nest_cancel(skb, protinfo);
3084                 goto nla_put_failure;
3085         }
3086
3087         nla_nest_end(skb, protinfo);
3088
3089         nlmsg_end(skb, nlh);
3090         return 0;
3091 nla_put_failure:
3092         nlmsg_cancel(skb, nlh);
3093         return err ? err : -EMSGSIZE;
3094 }
3095 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3096
3097 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3098 {
3099         struct net *net = sock_net(skb->sk);
3100         struct net_device *dev;
3101         int idx = 0;
3102         u32 portid = NETLINK_CB(cb->skb).portid;
3103         u32 seq = cb->nlh->nlmsg_seq;
3104         u32 filter_mask = 0;
3105         int err;
3106
3107         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3108                 struct nlattr *extfilt;
3109
3110                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3111                                           IFLA_EXT_MASK);
3112                 if (extfilt) {
3113                         if (nla_len(extfilt) < sizeof(filter_mask))
3114                                 return -EINVAL;
3115
3116                         filter_mask = nla_get_u32(extfilt);
3117                 }
3118         }
3119
3120         rcu_read_lock();
3121         for_each_netdev_rcu(net, dev) {
3122                 const struct net_device_ops *ops = dev->netdev_ops;
3123                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3124
3125                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3126                         if (idx >= cb->args[0]) {
3127                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
3128                                                 skb, portid, seq, dev,
3129                                                 filter_mask, NLM_F_MULTI);
3130                                 if (err < 0 && err != -EOPNOTSUPP)
3131                                         break;
3132                         }
3133                         idx++;
3134                 }
3135
3136                 if (ops->ndo_bridge_getlink) {
3137                         if (idx >= cb->args[0]) {
3138                                 err = ops->ndo_bridge_getlink(skb, portid,
3139                                                               seq, dev,
3140                                                               filter_mask,
3141                                                               NLM_F_MULTI);
3142                                 if (err < 0 && err != -EOPNOTSUPP)
3143                                         break;
3144                         }
3145                         idx++;
3146                 }
3147         }
3148         rcu_read_unlock();
3149         cb->args[0] = idx;
3150
3151         return skb->len;
3152 }
3153
3154 static inline size_t bridge_nlmsg_size(void)
3155 {
3156         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3157                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
3158                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
3159                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
3160                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
3161                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
3162                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
3163                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
3164                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3165                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
3166                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
3167 }
3168
3169 static int rtnl_bridge_notify(struct net_device *dev)
3170 {
3171         struct net *net = dev_net(dev);
3172         struct sk_buff *skb;
3173         int err = -EOPNOTSUPP;
3174
3175         if (!dev->netdev_ops->ndo_bridge_getlink)
3176                 return 0;
3177
3178         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3179         if (!skb) {
3180                 err = -ENOMEM;
3181                 goto errout;
3182         }
3183
3184         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3185         if (err < 0)
3186                 goto errout;
3187
3188         if (!skb->len)
3189                 goto errout;
3190
3191         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3192         return 0;
3193 errout:
3194         WARN_ON(err == -EMSGSIZE);
3195         kfree_skb(skb);
3196         if (err)
3197                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3198         return err;
3199 }
3200
3201 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3202 {
3203         struct net *net = sock_net(skb->sk);
3204         struct ifinfomsg *ifm;
3205         struct net_device *dev;
3206         struct nlattr *br_spec, *attr = NULL;
3207         int rem, err = -EOPNOTSUPP;
3208         u16 flags = 0;
3209         bool have_flags = false;
3210
3211         if (nlmsg_len(nlh) < sizeof(*ifm))
3212                 return -EINVAL;
3213
3214         ifm = nlmsg_data(nlh);
3215         if (ifm->ifi_family != AF_BRIDGE)
3216                 return -EPFNOSUPPORT;
3217
3218         dev = __dev_get_by_index(net, ifm->ifi_index);
3219         if (!dev) {
3220                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3221                 return -ENODEV;
3222         }
3223
3224         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3225         if (br_spec) {
3226                 nla_for_each_nested(attr, br_spec, rem) {
3227                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3228                                 if (nla_len(attr) < sizeof(flags))
3229                                         return -EINVAL;
3230
3231                                 have_flags = true;
3232                                 flags = nla_get_u16(attr);
3233                                 break;
3234                         }
3235                 }
3236         }
3237
3238         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3239                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3240
3241                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3242                         err = -EOPNOTSUPP;
3243                         goto out;
3244                 }
3245
3246                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3247                 if (err)
3248                         goto out;
3249
3250                 flags &= ~BRIDGE_FLAGS_MASTER;
3251         }
3252
3253         if ((flags & BRIDGE_FLAGS_SELF)) {
3254                 if (!dev->netdev_ops->ndo_bridge_setlink)
3255                         err = -EOPNOTSUPP;
3256                 else
3257                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3258                                                                   flags);
3259                 if (!err) {
3260                         flags &= ~BRIDGE_FLAGS_SELF;
3261
3262                         /* Generate event to notify upper layer of bridge
3263                          * change
3264                          */
3265                         err = rtnl_bridge_notify(dev);
3266                 }
3267         }
3268
3269         if (have_flags)
3270                 memcpy(nla_data(attr), &flags, sizeof(flags));
3271 out:
3272         return err;
3273 }
3274
3275 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3276 {
3277         struct net *net = sock_net(skb->sk);
3278         struct ifinfomsg *ifm;
3279         struct net_device *dev;
3280         struct nlattr *br_spec, *attr = NULL;
3281         int rem, err = -EOPNOTSUPP;
3282         u16 flags = 0;
3283         bool have_flags = false;
3284
3285         if (nlmsg_len(nlh) < sizeof(*ifm))
3286                 return -EINVAL;
3287
3288         ifm = nlmsg_data(nlh);
3289         if (ifm->ifi_family != AF_BRIDGE)
3290                 return -EPFNOSUPPORT;
3291
3292         dev = __dev_get_by_index(net, ifm->ifi_index);
3293         if (!dev) {
3294                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3295                 return -ENODEV;
3296         }
3297
3298         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3299         if (br_spec) {
3300                 nla_for_each_nested(attr, br_spec, rem) {
3301                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3302                                 if (nla_len(attr) < sizeof(flags))
3303                                         return -EINVAL;
3304
3305                                 have_flags = true;
3306                                 flags = nla_get_u16(attr);
3307                                 break;
3308                         }
3309                 }
3310         }
3311
3312         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3313                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3314
3315                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3316                         err = -EOPNOTSUPP;
3317                         goto out;
3318                 }
3319
3320                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3321                 if (err)
3322                         goto out;
3323
3324                 flags &= ~BRIDGE_FLAGS_MASTER;
3325         }
3326
3327         if ((flags & BRIDGE_FLAGS_SELF)) {
3328                 if (!dev->netdev_ops->ndo_bridge_dellink)
3329                         err = -EOPNOTSUPP;
3330                 else
3331                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3332                                                                   flags);
3333
3334                 if (!err) {
3335                         flags &= ~BRIDGE_FLAGS_SELF;
3336
3337                         /* Generate event to notify upper layer of bridge
3338                          * change
3339                          */
3340                         err = rtnl_bridge_notify(dev);
3341                 }
3342         }
3343
3344         if (have_flags)
3345                 memcpy(nla_data(attr), &flags, sizeof(flags));
3346 out:
3347         return err;
3348 }
3349
3350 /* Process one rtnetlink message. */
3351
3352 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3353 {
3354         struct net *net = sock_net(skb->sk);
3355         rtnl_doit_func doit;
3356         int sz_idx, kind;
3357         int family;
3358         int type;
3359         int err;
3360
3361         type = nlh->nlmsg_type;
3362         if (type > RTM_MAX)
3363                 return -EOPNOTSUPP;
3364
3365         type -= RTM_BASE;
3366
3367         /* All the messages must have at least 1 byte length */
3368         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3369                 return 0;
3370
3371         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3372         sz_idx = type>>2;
3373         kind = type&3;
3374
3375         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3376                 return -EPERM;
3377
3378         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3379                 struct sock *rtnl;
3380                 rtnl_dumpit_func dumpit;
3381                 rtnl_calcit_func calcit;
3382                 u16 min_dump_alloc = 0;
3383
3384                 dumpit = rtnl_get_dumpit(family, type);
3385                 if (dumpit == NULL)
3386                         return -EOPNOTSUPP;
3387                 calcit = rtnl_get_calcit(family, type);
3388                 if (calcit)
3389                         min_dump_alloc = calcit(skb, nlh);
3390
3391                 __rtnl_unlock();
3392                 rtnl = net->rtnl;
3393                 {
3394                         struct netlink_dump_control c = {
3395                                 .dump           = dumpit,
3396                                 .min_dump_alloc = min_dump_alloc,
3397                         };
3398                         err = netlink_dump_start(rtnl, skb, nlh, &c);
3399                 }
3400                 rtnl_lock();
3401                 return err;
3402         }
3403
3404         doit = rtnl_get_doit(family, type);
3405         if (doit == NULL)
3406                 return -EOPNOTSUPP;
3407
3408         return doit(skb, nlh);
3409 }
3410
3411 static void rtnetlink_rcv(struct sk_buff *skb)
3412 {
3413         rtnl_lock();
3414         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3415         rtnl_unlock();
3416 }
3417
3418 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3419 {
3420         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3421
3422         switch (event) {
3423         case NETDEV_UP:
3424         case NETDEV_DOWN:
3425         case NETDEV_PRE_UP:
3426         case NETDEV_POST_INIT:
3427         case NETDEV_REGISTER:
3428         case NETDEV_CHANGE:
3429         case NETDEV_PRE_TYPE_CHANGE:
3430         case NETDEV_GOING_DOWN:
3431         case NETDEV_UNREGISTER:
3432         case NETDEV_UNREGISTER_FINAL:
3433         case NETDEV_RELEASE:
3434         case NETDEV_JOIN:
3435         case NETDEV_BONDING_INFO:
3436                 break;
3437         default:
3438                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3439                 break;
3440         }
3441         return NOTIFY_DONE;
3442 }
3443
3444 static struct notifier_block rtnetlink_dev_notifier = {
3445         .notifier_call  = rtnetlink_event,
3446 };
3447
3448
3449 static int __net_init rtnetlink_net_init(struct net *net)
3450 {
3451         struct sock *sk;
3452         struct netlink_kernel_cfg cfg = {
3453                 .groups         = RTNLGRP_MAX,
3454                 .input          = rtnetlink_rcv,
3455                 .cb_mutex       = &rtnl_mutex,
3456                 .flags          = NL_CFG_F_NONROOT_RECV,
3457         };
3458
3459         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3460         if (!sk)
3461                 return -ENOMEM;
3462         net->rtnl = sk;
3463         return 0;
3464 }
3465
3466 static void __net_exit rtnetlink_net_exit(struct net *net)
3467 {
3468         netlink_kernel_release(net->rtnl);
3469         net->rtnl = NULL;
3470 }
3471
3472 static struct pernet_operations rtnetlink_net_ops = {
3473         .init = rtnetlink_net_init,
3474         .exit = rtnetlink_net_exit,
3475 };
3476
3477 void __init rtnetlink_init(void)
3478 {
3479         if (register_pernet_subsys(&rtnetlink_net_ops))
3480                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3481
3482         register_netdevice_notifier(&rtnetlink_dev_notifier);
3483
3484         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3485                       rtnl_dump_ifinfo, rtnl_calcit);
3486         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3487         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3488         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3489
3490         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3491         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3492
3493         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3494         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3495         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3496
3497         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3498         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3499         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3500 }