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