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/pci.h>
  40 #include <linux/etherdevice.h>
  41
  42 #include <asm/uaccess.h>
  43
  44 #include <linux/inet.h>
  45 #include <linux/netdevice.h>
  46 #include <net/ip.h>
  47 #include <net/protocol.h>
  48 #include <net/arp.h>
  49 #include <net/route.h>
  50 #include <net/udp.h>
  51 #include <net/sock.h>
  52 #include <net/pkt_sched.h>
  53 #include <net/fib_rules.h>
  54 #include <net/rtnetlink.h>
  55 #include <net/net_namespace.h>
  56
  57 struct rtnl_link {
  58         rtnl_doit_func          doit;
  59         rtnl_dumpit_func        dumpit;
  60         rtnl_calcit_func        calcit;
  61 };
  62
  63 static DEFINE_MUTEX(rtnl_mutex);
  64
  65 void rtnl_lock(void)
  66 {
  67         mutex_lock(&rtnl_mutex);
  68 }
  69 EXPORT_SYMBOL(rtnl_lock);
  70
  71 void __rtnl_unlock(void)
  72 {
  73         mutex_unlock(&rtnl_mutex);
  74 }
  75
  76 void rtnl_unlock(void)
  77 {
  78         /* This fellow will unlock it for us. */
  79         netdev_run_todo();
  80 }
  81 EXPORT_SYMBOL(rtnl_unlock);
  82
  83 int rtnl_trylock(void)
  84 {
  85         return mutex_trylock(&rtnl_mutex);
  86 }
  87 EXPORT_SYMBOL(rtnl_trylock);
  88
  89 int rtnl_is_locked(void)
  90 {
  91         return mutex_is_locked(&rtnl_mutex);
  92 }
  93 EXPORT_SYMBOL(rtnl_is_locked);
  94
  95 #ifdef CONFIG_PROVE_LOCKING
  96 int lockdep_rtnl_is_held(void)
  97 {
  98         return lockdep_is_held(&rtnl_mutex);
  99 }
 100 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 101 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 102
 103 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 104
 105 static inline int rtm_msgindex(int msgtype)
 106 {
 107         int msgindex = msgtype - RTM_BASE;
 108
 109         /*
 110          * msgindex < 0 implies someone tried to register a netlink
 111          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 112          * the message type has not been added to linux/rtnetlink.h
 113          */
 114         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 115
 116         return msgindex;
 117 }
 118
 119 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
 120 {
 121         struct rtnl_link *tab;
 122
 123         if (protocol <= RTNL_FAMILY_MAX)
 124                 tab = rtnl_msg_handlers[protocol];
 125         else
 126                 tab = NULL;
 127
 128         if (tab == NULL || tab[msgindex].doit == NULL)
 129                 tab = rtnl_msg_handlers[PF_UNSPEC];
 130
 131         return tab[msgindex].doit;
 132 }
 133
 134 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
 135 {
 136         struct rtnl_link *tab;
 137
 138         if (protocol <= RTNL_FAMILY_MAX)
 139                 tab = rtnl_msg_handlers[protocol];
 140         else
 141                 tab = NULL;
 142
 143         if (tab == NULL || tab[msgindex].dumpit == NULL)
 144                 tab = rtnl_msg_handlers[PF_UNSPEC];
 145
 146         return tab[msgindex].dumpit;
 147 }
 148
 149 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
 150 {
 151         struct rtnl_link *tab;
 152
 153         if (protocol <= RTNL_FAMILY_MAX)
 154                 tab = rtnl_msg_handlers[protocol];
 155         else
 156                 tab = NULL;
 157
 158         if (tab == NULL || tab[msgindex].calcit == NULL)
 159                 tab = rtnl_msg_handlers[PF_UNSPEC];
 160
 161         return tab[msgindex].calcit;
 162 }
 163
 164 /**
 165  * __rtnl_register - Register a rtnetlink message type
 166  * @protocol: Protocol family or PF_UNSPEC
 167  * @msgtype: rtnetlink message type
 168  * @doit: Function pointer called for each request message
 169  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 170  * @calcit: Function pointer to calc size of dump message
 171  *
 172  * Registers the specified function pointers (at least one of them has
 173  * to be non-NULL) to be called whenever a request message for the
 174  * specified protocol family and message type is received.
 175  *
 176  * The special protocol family PF_UNSPEC may be used to define fallback
 177  * function pointers for the case when no entry for the specific protocol
 178  * family exists.
 179  *
 180  * Returns 0 on success or a negative error code.
 181  */
 182 int __rtnl_register(int protocol, int msgtype,
 183                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 184                     rtnl_calcit_func calcit)
 185 {
 186         struct rtnl_link *tab;
 187         int msgindex;
 188
 189         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 190         msgindex = rtm_msgindex(msgtype);
 191
 192         tab = rtnl_msg_handlers[protocol];
 193         if (tab == NULL) {
 194                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 195                 if (tab == NULL)
 196                         return -ENOBUFS;
 197
 198                 rtnl_msg_handlers[protocol] = tab;
 199         }
 200
 201         if (doit)
 202                 tab[msgindex].doit = doit;
 203
 204         if (dumpit)
 205                 tab[msgindex].dumpit = dumpit;
 206
 207         if (calcit)
 208                 tab[msgindex].calcit = calcit;
 209
 210         return 0;
 211 }
 212 EXPORT_SYMBOL_GPL(__rtnl_register);
 213
 214 /**
 215  * rtnl_register - Register a rtnetlink message type
 216  *
 217  * Identical to __rtnl_register() but panics on failure. This is useful
 218  * as failure of this function is very unlikely, it can only happen due
 219  * to lack of memory when allocating the chain to store all message
 220  * handlers for a protocol. Meant for use in init functions where lack
 221  * of memory implies no sense in continuing.
 222  */
 223 void rtnl_register(int protocol, int msgtype,
 224                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 225                    rtnl_calcit_func calcit)
 226 {
 227         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
 228                 panic("Unable to register rtnetlink message handler, "
 229                       "protocol = %d, message type = %d\n",
 230                       protocol, msgtype);
 231 }
 232 EXPORT_SYMBOL_GPL(rtnl_register);
 233
 234 /**
 235  * rtnl_unregister - Unregister a rtnetlink message type
 236  * @protocol: Protocol family or PF_UNSPEC
 237  * @msgtype: rtnetlink message type
 238  *
 239  * Returns 0 on success or a negative error code.
 240  */
 241 int rtnl_unregister(int protocol, int msgtype)
 242 {
 243         int msgindex;
 244
 245         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 246         msgindex = rtm_msgindex(msgtype);
 247
 248         if (rtnl_msg_handlers[protocol] == NULL)
 249                 return -ENOENT;
 250
 251         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 252         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
 253
 254         return 0;
 255 }
 256 EXPORT_SYMBOL_GPL(rtnl_unregister);
 257
 258 /**
 259  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 260  * @protocol : Protocol family or PF_UNSPEC
 261  *
 262  * Identical to calling rtnl_unregster() for all registered message types
 263  * of a certain protocol family.
 264  */
 265 void rtnl_unregister_all(int protocol)
 266 {
 267         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 268
 269         kfree(rtnl_msg_handlers[protocol]);
 270         rtnl_msg_handlers[protocol] = NULL;
 271 }
 272 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 273
 274 static LIST_HEAD(link_ops);
 275
 276 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 277 {
 278         const struct rtnl_link_ops *ops;
 279
 280         list_for_each_entry(ops, &link_ops, list) {
 281                 if (!strcmp(ops->kind, kind))
 282                         return ops;
 283         }
 284         return NULL;
 285 }
 286
 287 /**
 288  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 289  * @ops: struct rtnl_link_ops * to register
 290  *
 291  * The caller must hold the rtnl_mutex. This function should be used
 292  * by drivers that create devices during module initialization. It
 293  * must be called before registering the devices.
 294  *
 295  * Returns 0 on success or a negative error code.
 296  */
 297 int __rtnl_link_register(struct rtnl_link_ops *ops)
 298 {
 299         if (rtnl_link_ops_get(ops->kind))
 300                 return -EEXIST;
 301
 302         if (!ops->dellink)
 303                 ops->dellink = unregister_netdevice_queue;
 304
 305         list_add_tail(&ops->list, &link_ops);
 306         return 0;
 307 }
 308 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 309
 310 /**
 311  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 312  * @ops: struct rtnl_link_ops * to register
 313  *
 314  * Returns 0 on success or a negative error code.
 315  */
 316 int rtnl_link_register(struct rtnl_link_ops *ops)
 317 {
 318         int err;
 319
 320         rtnl_lock();
 321         err = __rtnl_link_register(ops);
 322         rtnl_unlock();
 323         return err;
 324 }
 325 EXPORT_SYMBOL_GPL(rtnl_link_register);
 326
 327 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 328 {
 329         struct net_device *dev;
 330         LIST_HEAD(list_kill);
 331
 332         for_each_netdev(net, dev) {
 333                 if (dev->rtnl_link_ops == ops)
 334                         ops->dellink(dev, &list_kill);
 335         }
 336         unregister_netdevice_many(&list_kill);
 337 }
 338
 339 /**
 340  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 341  * @ops: struct rtnl_link_ops * to unregister
 342  *
 343  * The caller must hold the rtnl_mutex.
 344  */
 345 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 346 {
 347         struct net *net;
 348
 349         for_each_net(net) {
 350                 __rtnl_kill_links(net, ops);
 351         }
 352         list_del(&ops->list);
 353 }
 354 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 355
 356 /**
 357  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 358  * @ops: struct rtnl_link_ops * to unregister
 359  */
 360 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 361 {
 362         rtnl_lock();
 363         __rtnl_link_unregister(ops);
 364         rtnl_unlock();
 365 }
 366 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 367
 368 static size_t rtnl_link_get_size(const struct net_device *dev)
 369 {
 370         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 371         size_t size;
 372
 373         if (!ops)
 374                 return 0;
 375
 376         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 377                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 378
 379         if (ops->get_size)
 380                 /* IFLA_INFO_DATA + nested data */
 381                 size += nla_total_size(sizeof(struct nlattr)) +
 382                         ops->get_size(dev);
 383
 384         if (ops->get_xstats_size)
 385                 /* IFLA_INFO_XSTATS */
 386                 size += nla_total_size(ops->get_xstats_size(dev));
 387
 388         return size;
 389 }
 390
 391 static LIST_HEAD(rtnl_af_ops);
 392
 393 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 394 {
 395         const struct rtnl_af_ops *ops;
 396
 397         list_for_each_entry(ops, &rtnl_af_ops, list) {
 398                 if (ops->family == family)
 399                         return ops;
 400         }
 401
 402         return NULL;
 403 }
 404
 405 /**
 406  * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 407  * @ops: struct rtnl_af_ops * to register
 408  *
 409  * The caller must hold the rtnl_mutex.
 410  *
 411  * Returns 0 on success or a negative error code.
 412  */
 413 int __rtnl_af_register(struct rtnl_af_ops *ops)
 414 {
 415         list_add_tail(&ops->list, &rtnl_af_ops);
 416         return 0;
 417 }
 418 EXPORT_SYMBOL_GPL(__rtnl_af_register);
 419
 420 /**
 421  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 422  * @ops: struct rtnl_af_ops * to register
 423  *
 424  * Returns 0 on success or a negative error code.
 425  */
 426 int rtnl_af_register(struct rtnl_af_ops *ops)
 427 {
 428         int err;
 429
 430         rtnl_lock();
 431         err = __rtnl_af_register(ops);
 432         rtnl_unlock();
 433         return err;
 434 }
 435 EXPORT_SYMBOL_GPL(rtnl_af_register);
 436
 437 /**
 438  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 439  * @ops: struct rtnl_af_ops * to unregister
 440  *
 441  * The caller must hold the rtnl_mutex.
 442  */
 443 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 444 {
 445         list_del(&ops->list);
 446 }
 447 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 448
 449 /**
 450  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 451  * @ops: struct rtnl_af_ops * to unregister
 452  */
 453 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 454 {
 455         rtnl_lock();
 456         __rtnl_af_unregister(ops);
 457         rtnl_unlock();
 458 }
 459 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 460
 461 static size_t rtnl_link_get_af_size(const struct net_device *dev)
 462 {
 463         struct rtnl_af_ops *af_ops;
 464         size_t size;
 465
 466         /* IFLA_AF_SPEC */
 467         size = nla_total_size(sizeof(struct nlattr));
 468
 469         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 470                 if (af_ops->get_link_af_size) {
 471                         /* AF_* + nested data */
 472                         size += nla_total_size(sizeof(struct nlattr)) +
 473                                 af_ops->get_link_af_size(dev);
 474                 }
 475         }
 476
 477         return size;
 478 }
 479
 480 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 481 {
 482         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 483         struct nlattr *linkinfo, *data;
 484         int err = -EMSGSIZE;
 485
 486         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 487         if (linkinfo == NULL)
 488                 goto out;
 489
 490         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 491                 goto err_cancel_link;
 492         if (ops->fill_xstats) {
 493                 err = ops->fill_xstats(skb, dev);
 494                 if (err < 0)
 495                         goto err_cancel_link;
 496         }
 497         if (ops->fill_info) {
 498                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 499                 if (data == NULL) {
 500                         err = -EMSGSIZE;
 501                         goto err_cancel_link;
 502                 }
 503                 err = ops->fill_info(skb, dev);
 504                 if (err < 0)
 505                         goto err_cancel_data;
 506                 nla_nest_end(skb, data);
 507         }
 508
 509         nla_nest_end(skb, linkinfo);
 510         return 0;
 511
 512 err_cancel_data:
 513         nla_nest_cancel(skb, data);
 514 err_cancel_link:
 515         nla_nest_cancel(skb, linkinfo);
 516 out:
 517         return err;
 518 }
 519
 520 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 521 {
 522         struct sock *rtnl = net->rtnl;
 523         int err = 0;
 524
 525         NETLINK_CB(skb).dst_group = group;
 526         if (echo)
 527                 atomic_inc(&skb->users);
 528         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 529         if (echo)
 530                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 531         return err;
 532 }
 533
 534 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 535 {
 536         struct sock *rtnl = net->rtnl;
 537
 538         return nlmsg_unicast(rtnl, skb, pid);
 539 }
 540 EXPORT_SYMBOL(rtnl_unicast);
 541
 542 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 543                  struct nlmsghdr *nlh, gfp_t flags)
 544 {
 545         struct sock *rtnl = net->rtnl;
 546         int report = 0;
 547
 548         if (nlh)
 549                 report = nlmsg_report(nlh);
 550
 551         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 552 }
 553 EXPORT_SYMBOL(rtnl_notify);
 554
 555 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 556 {
 557         struct sock *rtnl = net->rtnl;
 558
 559         netlink_set_err(rtnl, 0, group, error);
 560 }
 561 EXPORT_SYMBOL(rtnl_set_sk_err);
 562
 563 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 564 {
 565         struct nlattr *mx;
 566         int i, valid = 0;
 567
 568         mx = nla_nest_start(skb, RTA_METRICS);
 569         if (mx == NULL)
 570                 return -ENOBUFS;
 571
 572         for (i = 0; i < RTAX_MAX; i++) {
 573                 if (metrics[i]) {
 574                         valid++;
 575                         if (nla_put_u32(skb, i+1, metrics[i]))
 576                                 goto nla_put_failure;
 577                 }
 578         }
 579
 580         if (!valid) {
 581                 nla_nest_cancel(skb, mx);
 582                 return 0;
 583         }
 584
 585         return nla_nest_end(skb, mx);
 586
 587 nla_put_failure:
 588         nla_nest_cancel(skb, mx);
 589         return -EMSGSIZE;
 590 }
 591 EXPORT_SYMBOL(rtnetlink_put_metrics);
 592
 593 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 594                        long expires, u32 error)
 595 {
 596         struct rta_cacheinfo ci = {
 597                 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
 598                 .rta_used = dst->__use,
 599                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 600                 .rta_error = error,
 601                 .rta_id =  id,
 602         };
 603
 604         if (expires) {
 605                 unsigned long clock;
 606
 607                 clock = jiffies_to_clock_t(abs(expires));
 608                 clock = min_t(unsigned long, clock, INT_MAX);
 609                 ci.rta_expires = (expires > 0) ? clock : -clock;
 610         }
 611         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 612 }
 613 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 614
 615 static void set_operstate(struct net_device *dev, unsigned char transition)
 616 {
 617         unsigned char operstate = dev->operstate;
 618
 619         switch (transition) {
 620         case IF_OPER_UP:
 621                 if ((operstate == IF_OPER_DORMANT ||
 622                      operstate == IF_OPER_UNKNOWN) &&
 623                     !netif_dormant(dev))
 624                         operstate = IF_OPER_UP;
 625                 break;
 626
 627         case IF_OPER_DORMANT:
 628                 if (operstate == IF_OPER_UP ||
 629                     operstate == IF_OPER_UNKNOWN)
 630                         operstate = IF_OPER_DORMANT;
 631                 break;
 632         }
 633
 634         if (dev->operstate != operstate) {
 635                 write_lock_bh(&dev_base_lock);
 636                 dev->operstate = operstate;
 637                 write_unlock_bh(&dev_base_lock);
 638                 netdev_state_change(dev);
 639         }
 640 }
 641
 642 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 643 {
 644         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 645                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 646 }
 647
 648 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 649                                            const struct ifinfomsg *ifm)
 650 {
 651         unsigned int flags = ifm->ifi_flags;
 652
 653         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 654         if (ifm->ifi_change)
 655                 flags = (flags & ifm->ifi_change) |
 656                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 657
 658         return flags;
 659 }
 660
 661 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 662                                  const struct rtnl_link_stats64 *b)
 663 {
 664         a->rx_packets = b->rx_packets;
 665         a->tx_packets = b->tx_packets;
 666         a->rx_bytes = b->rx_bytes;
 667         a->tx_bytes = b->tx_bytes;
 668         a->rx_errors = b->rx_errors;
 669         a->tx_errors = b->tx_errors;
 670         a->rx_dropped = b->rx_dropped;
 671         a->tx_dropped = b->tx_dropped;
 672
 673         a->multicast = b->multicast;
 674         a->collisions = b->collisions;
 675
 676         a->rx_length_errors = b->rx_length_errors;
 677         a->rx_over_errors = b->rx_over_errors;
 678         a->rx_crc_errors = b->rx_crc_errors;
 679         a->rx_frame_errors = b->rx_frame_errors;
 680         a->rx_fifo_errors = b->rx_fifo_errors;
 681         a->rx_missed_errors = b->rx_missed_errors;
 682
 683         a->tx_aborted_errors = b->tx_aborted_errors;
 684         a->tx_carrier_errors = b->tx_carrier_errors;
 685         a->tx_fifo_errors = b->tx_fifo_errors;
 686         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 687         a->tx_window_errors = b->tx_window_errors;
 688
 689         a->rx_compressed = b->rx_compressed;
 690         a->tx_compressed = b->tx_compressed;
 691 }
 692
 693 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
 694 {
 695         memcpy(v, b, sizeof(*b));
 696 }
 697
 698 /* All VF info */
 699 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 700                                    u32 ext_filter_mask)
 701 {
 702         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 703             (ext_filter_mask & RTEXT_FILTER_VF)) {
 704                 int num_vfs = dev_num_vf(dev->dev.parent);
 705                 size_t size = nla_total_size(sizeof(struct nlattr));
 706                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 707                 size += num_vfs *
 708                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 709                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 710                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 711                          nla_total_size(sizeof(struct ifla_vf_spoofchk)));
 712                 return size;
 713         } else
 714                 return 0;
 715 }
 716
 717 static size_t rtnl_port_size(const struct net_device *dev)
 718 {
 719         size_t port_size = nla_total_size(4)            /* PORT_VF */
 720                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 721                 + nla_total_size(sizeof(struct ifla_port_vsi))
 722                                                         /* PORT_VSI_TYPE */
 723                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 724                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 725                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 726                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 727         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 728         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 729                 + port_size;
 730         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 731                 + port_size;
 732
 733         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 734                 return 0;
 735         if (dev_num_vf(dev->dev.parent))
 736                 return port_self_size + vf_ports_size +
 737                         vf_port_size * dev_num_vf(dev->dev.parent);
 738         else
 739                 return port_self_size;
 740 }
 741
 742 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 743                                      u32 ext_filter_mask)
 744 {
 745         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 746                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 747                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 748                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 749                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 750                + nla_total_size(sizeof(struct rtnl_link_stats))
 751                + nla_total_size(sizeof(struct rtnl_link_stats64))
 752                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 753                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 754                + nla_total_size(4) /* IFLA_TXQLEN */
 755                + nla_total_size(4) /* IFLA_WEIGHT */
 756                + nla_total_size(4) /* IFLA_MTU */
 757                + nla_total_size(4) /* IFLA_LINK */
 758                + nla_total_size(4) /* IFLA_MASTER */
 759                + nla_total_size(1) /* IFLA_CARRIER */
 760                + nla_total_size(4) /* IFLA_PROMISCUITY */
 761                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 762                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 763                + nla_total_size(1) /* IFLA_OPERSTATE */
 764                + nla_total_size(1) /* IFLA_LINKMODE */
 765                + nla_total_size(ext_filter_mask
 766                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 767                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 768                + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 769                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 770                + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
 771                + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */
 772 }
 773
 774 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 775 {
 776         struct nlattr *vf_ports;
 777         struct nlattr *vf_port;
 778         int vf;
 779         int err;
 780
 781         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 782         if (!vf_ports)
 783                 return -EMSGSIZE;
 784
 785         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 786                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 787                 if (!vf_port)
 788                         goto nla_put_failure;
 789                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 790                         goto nla_put_failure;
 791                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 792                 if (err == -EMSGSIZE)
 793                         goto nla_put_failure;
 794                 if (err) {
 795                         nla_nest_cancel(skb, vf_port);
 796                         continue;
 797                 }
 798                 nla_nest_end(skb, vf_port);
 799         }
 800
 801         nla_nest_end(skb, vf_ports);
 802
 803         return 0;
 804
 805 nla_put_failure:
 806         nla_nest_cancel(skb, vf_ports);
 807         return -EMSGSIZE;
 808 }
 809
 810 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 811 {
 812         struct nlattr *port_self;
 813         int err;
 814
 815         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 816         if (!port_self)
 817                 return -EMSGSIZE;
 818
 819         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 820         if (err) {
 821                 nla_nest_cancel(skb, port_self);
 822                 return (err == -EMSGSIZE) ? err : 0;
 823         }
 824
 825         nla_nest_end(skb, port_self);
 826
 827         return 0;
 828 }
 829
 830 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
 831 {
 832         int err;
 833
 834         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 835                 return 0;
 836
 837         err = rtnl_port_self_fill(skb, dev);
 838         if (err)
 839                 return err;
 840
 841         if (dev_num_vf(dev->dev.parent)) {
 842                 err = rtnl_vf_ports_fill(skb, dev);
 843                 if (err)
 844                         return err;
 845         }
 846
 847         return 0;
 848 }
 849
 850 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
 851 {
 852         int err;
 853         struct netdev_phys_port_id ppid;
 854
 855         err = dev_get_phys_port_id(dev, &ppid);
 856         if (err) {
 857                 if (err == -EOPNOTSUPP)
 858                         return 0;
 859                 return err;
 860         }
 861
 862         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
 863                 return -EMSGSIZE;
 864
 865         return 0;
 866 }
 867
 868 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 869                             int type, u32 pid, u32 seq, u32 change,
 870                             unsigned int flags, u32 ext_filter_mask)
 871 {
 872         struct ifinfomsg *ifm;
 873         struct nlmsghdr *nlh;
 874         struct rtnl_link_stats64 temp;
 875         const struct rtnl_link_stats64 *stats;
 876         struct nlattr *attr, *af_spec;
 877         struct rtnl_af_ops *af_ops;
 878         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
 879
 880         ASSERT_RTNL();
 881         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 882         if (nlh == NULL)
 883                 return -EMSGSIZE;
 884
 885         ifm = nlmsg_data(nlh);
 886         ifm->ifi_family = AF_UNSPEC;
 887         ifm->__ifi_pad = 0;
 888         ifm->ifi_type = dev->type;
 889         ifm->ifi_index = dev->ifindex;
 890         ifm->ifi_flags = dev_get_flags(dev);
 891         ifm->ifi_change = change;
 892
 893         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
 894             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
 895             nla_put_u8(skb, IFLA_OPERSTATE,
 896                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
 897             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
 898             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
 899             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
 900             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
 901             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
 902 #ifdef CONFIG_RPS
 903             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
 904 #endif
 905             (dev->ifindex != dev->iflink &&
 906              nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
 907             (upper_dev &&
 908              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
 909             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
 910             (dev->qdisc &&
 911              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
 912             (dev->ifalias &&
 913              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)))
 914                 goto nla_put_failure;
 915
 916         if (1) {
 917                 struct rtnl_link_ifmap map = {
 918                         .mem_start   = dev->mem_start,
 919                         .mem_end     = dev->mem_end,
 920                         .base_addr   = dev->base_addr,
 921                         .irq         = dev->irq,
 922                         .dma         = dev->dma,
 923                         .port        = dev->if_port,
 924                 };
 925                 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
 926                         goto nla_put_failure;
 927         }
 928
 929         if (dev->addr_len) {
 930                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
 931                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
 932                         goto nla_put_failure;
 933         }
 934
 935         if (rtnl_phys_port_id_fill(skb, dev))
 936                 goto nla_put_failure;
 937
 938         attr = nla_reserve(skb, IFLA_STATS,
 939                         sizeof(struct rtnl_link_stats));
 940         if (attr == NULL)
 941                 goto nla_put_failure;
 942
 943         stats = dev_get_stats(dev, &temp);
 944         copy_rtnl_link_stats(nla_data(attr), stats);
 945
 946         attr = nla_reserve(skb, IFLA_STATS64,
 947                         sizeof(struct rtnl_link_stats64));
 948         if (attr == NULL)
 949                 goto nla_put_failure;
 950         copy_rtnl_link_stats64(nla_data(attr), stats);
 951
 952         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
 953             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
 954                 goto nla_put_failure;
 955
 956         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
 957             && (ext_filter_mask & RTEXT_FILTER_VF)) {
 958                 int i;
 959
 960                 struct nlattr *vfinfo, *vf;
 961                 int num_vfs = dev_num_vf(dev->dev.parent);
 962
 963                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
 964                 if (!vfinfo)
 965                         goto nla_put_failure;
 966                 for (i = 0; i < num_vfs; i++) {
 967                         struct ifla_vf_info ivi;
 968                         struct ifla_vf_mac vf_mac;
 969                         struct ifla_vf_vlan vf_vlan;
 970                         struct ifla_vf_tx_rate vf_tx_rate;
 971                         struct ifla_vf_spoofchk vf_spoofchk;
 972                         struct ifla_vf_link_state vf_linkstate;
 973
 974                         /*
 975                          * Not all SR-IOV capable drivers support the
 976                          * spoofcheck query.  Preset to -1 so the user
 977                          * space tool can detect that the driver didn't
 978                          * report anything.
 979                          */
 980                         ivi.spoofchk = -1;
 981                         memset(ivi.mac, 0, sizeof(ivi.mac));
 982                         /* The default value for VF link state is "auto"
 983                          * IFLA_VF_LINK_STATE_AUTO which equals zero
 984                          */
 985                         ivi.linkstate = 0;
 986                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
 987                                 break;
 988                         vf_mac.vf =
 989                                 vf_vlan.vf =
 990                                 vf_tx_rate.vf =
 991                                 vf_spoofchk.vf =
 992                                 vf_linkstate.vf = ivi.vf;
 993
 994                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
 995                         vf_vlan.vlan = ivi.vlan;
 996                         vf_vlan.qos = ivi.qos;
 997                         vf_tx_rate.rate = ivi.tx_rate;
 998                         vf_spoofchk.setting = ivi.spoofchk;
 999                         vf_linkstate.link_state = ivi.linkstate;
1000                         vf = nla_nest_start(skb, IFLA_VF_INFO);
1001                         if (!vf) {
1002                                 nla_nest_cancel(skb, vfinfo);
1003                                 goto nla_put_failure;
1004                         }
1005                         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1006                             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1007                             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1008                                     &vf_tx_rate) ||
1009                             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1010                                     &vf_spoofchk) ||
1011                             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1012                                     &vf_linkstate))
1013                                 goto nla_put_failure;
1014                         nla_nest_end(skb, vf);
1015                 }
1016                 nla_nest_end(skb, vfinfo);
1017         }
1018
1019         if (rtnl_port_fill(skb, dev))
1020                 goto nla_put_failure;
1021
1022         if (dev->rtnl_link_ops) {
1023                 if (rtnl_link_fill(skb, dev) < 0)
1024                         goto nla_put_failure;
1025         }
1026
1027         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1028                 goto nla_put_failure;
1029
1030         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1031                 if (af_ops->fill_link_af) {
1032                         struct nlattr *af;
1033                         int err;
1034
1035                         if (!(af = nla_nest_start(skb, af_ops->family)))
1036                                 goto nla_put_failure;
1037
1038                         err = af_ops->fill_link_af(skb, dev);
1039
1040                         /*
1041                          * Caller may return ENODATA to indicate that there
1042                          * was no data to be dumped. This is not an error, it
1043                          * means we should trim the attribute header and
1044                          * continue.
1045                          */
1046                         if (err == -ENODATA)
1047                                 nla_nest_cancel(skb, af);
1048                         else if (err < 0)
1049                                 goto nla_put_failure;
1050
1051                         nla_nest_end(skb, af);
1052                 }
1053         }
1054
1055         nla_nest_end(skb, af_spec);
1056
1057         return nlmsg_end(skb, nlh);
1058
1059 nla_put_failure:
1060         nlmsg_cancel(skb, nlh);
1061         return -EMSGSIZE;
1062 }
1063
1064 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1065 {
1066         struct net *net = sock_net(skb->sk);
1067         int h, s_h;
1068         int idx = 0, s_idx;
1069         struct net_device *dev;
1070         struct hlist_head *head;
1071         struct nlattr *tb[IFLA_MAX+1];
1072         u32 ext_filter_mask = 0;
1073
1074         s_h = cb->args[0];
1075         s_idx = cb->args[1];
1076
1077         rcu_read_lock();
1078         cb->seq = net->dev_base_seq;
1079
1080         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1081                         ifla_policy) >= 0) {
1082
1083                 if (tb[IFLA_EXT_MASK])
1084                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1085         }
1086
1087         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1088                 idx = 0;
1089                 head = &net->dev_index_head[h];
1090                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1091                         if (idx < s_idx)
1092                                 goto cont;
1093                         if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1094                                              NETLINK_CB(cb->skb).portid,
1095                                              cb->nlh->nlmsg_seq, 0,
1096                                              NLM_F_MULTI,
1097                                              ext_filter_mask) <= 0)
1098                                 goto out;
1099
1100                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1101 cont:
1102                         idx++;
1103                 }
1104         }
1105 out:
1106         rcu_read_unlock();
1107         cb->args[1] = idx;
1108         cb->args[0] = h;
1109
1110         return skb->len;
1111 }
1112
1113 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1114         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1115         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1116         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1117         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1118         [IFLA_MTU]              = { .type = NLA_U32 },
1119         [IFLA_LINK]             = { .type = NLA_U32 },
1120         [IFLA_MASTER]           = { .type = NLA_U32 },
1121         [IFLA_CARRIER]          = { .type = NLA_U8 },
1122         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1123         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1124         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1125         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1126         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1127         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1128         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1129         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1130         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1131         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1132         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1133         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1134         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1135         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1136         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1137         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1138         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
1139 };
1140 EXPORT_SYMBOL(ifla_policy);
1141
1142 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1143         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1144         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1145 };
1146
1147 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1148         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1149 };
1150
1151 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1152         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1153                                     .len = sizeof(struct ifla_vf_mac) },
1154         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1155                                     .len = sizeof(struct ifla_vf_vlan) },
1156         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1157                                     .len = sizeof(struct ifla_vf_tx_rate) },
1158         [IFLA_VF_SPOOFCHK]      = { .type = NLA_BINARY,
1159                                     .len = sizeof(struct ifla_vf_spoofchk) },
1160 };
1161
1162 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1163         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1164         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1165                                     .len = PORT_PROFILE_MAX },
1166         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1167                                     .len = sizeof(struct ifla_port_vsi)},
1168         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1169                                       .len = PORT_UUID_MAX },
1170         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1171                                     .len = PORT_UUID_MAX },
1172         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1173         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1174 };
1175
1176 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1177 {
1178         struct net *net;
1179         /* Examine the link attributes and figure out which
1180          * network namespace we are talking about.
1181          */
1182         if (tb[IFLA_NET_NS_PID])
1183                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1184         else if (tb[IFLA_NET_NS_FD])
1185                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1186         else
1187                 net = get_net(src_net);
1188         return net;
1189 }
1190 EXPORT_SYMBOL(rtnl_link_get_net);
1191
1192 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1193 {
1194         if (dev) {
1195                 if (tb[IFLA_ADDRESS] &&
1196                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1197                         return -EINVAL;
1198
1199                 if (tb[IFLA_BROADCAST] &&
1200                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1201                         return -EINVAL;
1202         }
1203
1204         if (tb[IFLA_AF_SPEC]) {
1205                 struct nlattr *af;
1206                 int rem, err;
1207
1208                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1209                         const struct rtnl_af_ops *af_ops;
1210
1211                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1212                                 return -EAFNOSUPPORT;
1213
1214                         if (!af_ops->set_link_af)
1215                                 return -EOPNOTSUPP;
1216
1217                         if (af_ops->validate_link_af) {
1218                                 err = af_ops->validate_link_af(dev, af);
1219                                 if (err < 0)
1220                                         return err;
1221                         }
1222                 }
1223         }
1224
1225         return 0;
1226 }
1227
1228 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1229 {
1230         int rem, err = -EINVAL;
1231         struct nlattr *vf;
1232         const struct net_device_ops *ops = dev->netdev_ops;
1233
1234         nla_for_each_nested(vf, attr, rem) {
1235                 switch (nla_type(vf)) {
1236                 case IFLA_VF_MAC: {
1237                         struct ifla_vf_mac *ivm;
1238                         ivm = nla_data(vf);
1239                         err = -EOPNOTSUPP;
1240                         if (ops->ndo_set_vf_mac)
1241                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1242                                                           ivm->mac);
1243                         break;
1244                 }
1245                 case IFLA_VF_VLAN: {
1246                         struct ifla_vf_vlan *ivv;
1247                         ivv = nla_data(vf);
1248                         err = -EOPNOTSUPP;
1249                         if (ops->ndo_set_vf_vlan)
1250                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1251                                                            ivv->vlan,
1252                                                            ivv->qos);
1253                         break;
1254                 }
1255                 case IFLA_VF_TX_RATE: {
1256                         struct ifla_vf_tx_rate *ivt;
1257                         ivt = nla_data(vf);
1258                         err = -EOPNOTSUPP;
1259                         if (ops->ndo_set_vf_tx_rate)
1260                                 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1261                                                               ivt->rate);
1262                         break;
1263                 }
1264                 case IFLA_VF_SPOOFCHK: {
1265                         struct ifla_vf_spoofchk *ivs;
1266                         ivs = nla_data(vf);
1267                         err = -EOPNOTSUPP;
1268                         if (ops->ndo_set_vf_spoofchk)
1269                                 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1270                                                                ivs->setting);
1271                         break;
1272                 }
1273                 case IFLA_VF_LINK_STATE: {
1274                         struct ifla_vf_link_state *ivl;
1275                         ivl = nla_data(vf);
1276                         err = -EOPNOTSUPP;
1277                         if (ops->ndo_set_vf_link_state)
1278                                 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1279                                                                  ivl->link_state);
1280                         break;
1281                 }
1282                 default:
1283                         err = -EINVAL;
1284                         break;
1285                 }
1286                 if (err)
1287                         break;
1288         }
1289         return err;
1290 }
1291
1292 static int do_set_master(struct net_device *dev, int ifindex)
1293 {
1294         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1295         const struct net_device_ops *ops;
1296         int err;
1297
1298         if (upper_dev) {
1299                 if (upper_dev->ifindex == ifindex)
1300                         return 0;
1301                 ops = upper_dev->netdev_ops;
1302                 if (ops->ndo_del_slave) {
1303                         err = ops->ndo_del_slave(upper_dev, dev);
1304                         if (err)
1305                                 return err;
1306                 } else {
1307                         return -EOPNOTSUPP;
1308                 }
1309         }
1310
1311         if (ifindex) {
1312                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1313                 if (!upper_dev)
1314                         return -EINVAL;
1315                 ops = upper_dev->netdev_ops;
1316                 if (ops->ndo_add_slave) {
1317                         err = ops->ndo_add_slave(upper_dev, dev);
1318                         if (err)
1319                                 return err;
1320                 } else {
1321                         return -EOPNOTSUPP;
1322                 }
1323         }
1324         return 0;
1325 }
1326
1327 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1328                       struct nlattr **tb, char *ifname, int modified)
1329 {
1330         const struct net_device_ops *ops = dev->netdev_ops;
1331         int err;
1332
1333         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1334                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1335                 if (IS_ERR(net)) {
1336                         err = PTR_ERR(net);
1337                         goto errout;
1338                 }
1339                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1340                         err = -EPERM;
1341                         goto errout;
1342                 }
1343                 err = dev_change_net_namespace(dev, net, ifname);
1344                 put_net(net);
1345                 if (err)
1346                         goto errout;
1347                 modified = 1;
1348         }
1349
1350         if (tb[IFLA_MAP]) {
1351                 struct rtnl_link_ifmap *u_map;
1352                 struct ifmap k_map;
1353
1354                 if (!ops->ndo_set_config) {
1355                         err = -EOPNOTSUPP;
1356                         goto errout;
1357                 }
1358
1359                 if (!netif_device_present(dev)) {
1360                         err = -ENODEV;
1361                         goto errout;
1362                 }
1363
1364                 u_map = nla_data(tb[IFLA_MAP]);
1365                 k_map.mem_start = (unsigned long) u_map->mem_start;
1366                 k_map.mem_end = (unsigned long) u_map->mem_end;
1367                 k_map.base_addr = (unsigned short) u_map->base_addr;
1368                 k_map.irq = (unsigned char) u_map->irq;
1369                 k_map.dma = (unsigned char) u_map->dma;
1370                 k_map.port = (unsigned char) u_map->port;
1371
1372                 err = ops->ndo_set_config(dev, &k_map);
1373                 if (err < 0)
1374                         goto errout;
1375
1376                 modified = 1;
1377         }
1378
1379         if (tb[IFLA_ADDRESS]) {
1380                 struct sockaddr *sa;
1381                 int len;
1382
1383                 len = sizeof(sa_family_t) + dev->addr_len;
1384                 sa = kmalloc(len, GFP_KERNEL);
1385                 if (!sa) {
1386                         err = -ENOMEM;
1387                         goto errout;
1388                 }
1389                 sa->sa_family = dev->type;
1390                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1391                        dev->addr_len);
1392                 err = dev_set_mac_address(dev, sa);
1393                 kfree(sa);
1394                 if (err)
1395                         goto errout;
1396                 modified = 1;
1397         }
1398
1399         if (tb[IFLA_MTU]) {
1400                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1401                 if (err < 0)
1402                         goto errout;
1403                 modified = 1;
1404         }
1405
1406         if (tb[IFLA_GROUP]) {
1407                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1408                 modified = 1;
1409         }
1410
1411         /*
1412          * Interface selected by interface index but interface
1413          * name provided implies that a name change has been
1414          * requested.
1415          */
1416         if (ifm->ifi_index > 0 && ifname[0]) {
1417                 err = dev_change_name(dev, ifname);
1418                 if (err < 0)
1419                         goto errout;
1420                 modified = 1;
1421         }
1422
1423         if (tb[IFLA_IFALIAS]) {
1424                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1425                                     nla_len(tb[IFLA_IFALIAS]));
1426                 if (err < 0)
1427                         goto errout;
1428                 modified = 1;
1429         }
1430
1431         if (tb[IFLA_BROADCAST]) {
1432                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1433                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1434         }
1435
1436         if (ifm->ifi_flags || ifm->ifi_change) {
1437                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1438                 if (err < 0)
1439                         goto errout;
1440         }
1441
1442         if (tb[IFLA_MASTER]) {
1443                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1444                 if (err)
1445                         goto errout;
1446                 modified = 1;
1447         }
1448
1449         if (tb[IFLA_CARRIER]) {
1450                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1451                 if (err)
1452                         goto errout;
1453                 modified = 1;
1454         }
1455
1456         if (tb[IFLA_TXQLEN])
1457                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1458
1459         if (tb[IFLA_OPERSTATE])
1460                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1461
1462         if (tb[IFLA_LINKMODE]) {
1463                 write_lock_bh(&dev_base_lock);
1464                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1465                 write_unlock_bh(&dev_base_lock);
1466         }
1467
1468         if (tb[IFLA_VFINFO_LIST]) {
1469                 struct nlattr *attr;
1470                 int rem;
1471                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1472                         if (nla_type(attr) != IFLA_VF_INFO) {
1473                                 err = -EINVAL;
1474                                 goto errout;
1475                         }
1476                         err = do_setvfinfo(dev, attr);
1477                         if (err < 0)
1478                                 goto errout;
1479                         modified = 1;
1480                 }
1481         }
1482         err = 0;
1483
1484         if (tb[IFLA_VF_PORTS]) {
1485                 struct nlattr *port[IFLA_PORT_MAX+1];
1486                 struct nlattr *attr;
1487                 int vf;
1488                 int rem;
1489
1490                 err = -EOPNOTSUPP;
1491                 if (!ops->ndo_set_vf_port)
1492                         goto errout;
1493
1494                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1495                         if (nla_type(attr) != IFLA_VF_PORT)
1496                                 continue;
1497                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1498                                 attr, ifla_port_policy);
1499                         if (err < 0)
1500                                 goto errout;
1501                         if (!port[IFLA_PORT_VF]) {
1502                                 err = -EOPNOTSUPP;
1503                                 goto errout;
1504                         }
1505                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1506                         err = ops->ndo_set_vf_port(dev, vf, port);
1507                         if (err < 0)
1508                                 goto errout;
1509                         modified = 1;
1510                 }
1511         }
1512         err = 0;
1513
1514         if (tb[IFLA_PORT_SELF]) {
1515                 struct nlattr *port[IFLA_PORT_MAX+1];
1516
1517                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1518                         tb[IFLA_PORT_SELF], ifla_port_policy);
1519                 if (err < 0)
1520                         goto errout;
1521
1522                 err = -EOPNOTSUPP;
1523                 if (ops->ndo_set_vf_port)
1524                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1525                 if (err < 0)
1526                         goto errout;
1527                 modified = 1;
1528         }
1529
1530         if (tb[IFLA_AF_SPEC]) {
1531                 struct nlattr *af;
1532                 int rem;
1533
1534                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1535                         const struct rtnl_af_ops *af_ops;
1536
1537                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1538                                 BUG();
1539
1540                         err = af_ops->set_link_af(dev, af);
1541                         if (err < 0)
1542                                 goto errout;
1543
1544                         modified = 1;
1545                 }
1546         }
1547         err = 0;
1548
1549 errout:
1550         if (err < 0 && modified)
1551                 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",
1552                                      dev->name);
1553
1554         return err;
1555 }
1556
1557 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1558 {
1559         struct net *net = sock_net(skb->sk);
1560         struct ifinfomsg *ifm;
1561         struct net_device *dev;
1562         int err;
1563         struct nlattr *tb[IFLA_MAX+1];
1564         char ifname[IFNAMSIZ];
1565
1566         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1567         if (err < 0)
1568                 goto errout;
1569
1570         if (tb[IFLA_IFNAME])
1571                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1572         else
1573                 ifname[0] = '\0';
1574
1575         err = -EINVAL;
1576         ifm = nlmsg_data(nlh);
1577         if (ifm->ifi_index > 0)
1578                 dev = __dev_get_by_index(net, ifm->ifi_index);
1579         else if (tb[IFLA_IFNAME])
1580                 dev = __dev_get_by_name(net, ifname);
1581         else
1582                 goto errout;
1583
1584         if (dev == NULL) {
1585                 err = -ENODEV;
1586                 goto errout;
1587         }
1588
1589         err = validate_linkmsg(dev, tb);
1590         if (err < 0)
1591                 goto errout;
1592
1593         err = do_setlink(dev, ifm, tb, ifname, 0);
1594 errout:
1595         return err;
1596 }
1597
1598 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1599 {
1600         struct net *net = sock_net(skb->sk);
1601         const struct rtnl_link_ops *ops;
1602         struct net_device *dev;
1603         struct ifinfomsg *ifm;
1604         char ifname[IFNAMSIZ];
1605         struct nlattr *tb[IFLA_MAX+1];
1606         int err;
1607         LIST_HEAD(list_kill);
1608
1609         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1610         if (err < 0)
1611                 return err;
1612
1613         if (tb[IFLA_IFNAME])
1614                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1615
1616         ifm = nlmsg_data(nlh);
1617         if (ifm->ifi_index > 0)
1618                 dev = __dev_get_by_index(net, ifm->ifi_index);
1619         else if (tb[IFLA_IFNAME])
1620                 dev = __dev_get_by_name(net, ifname);
1621         else
1622                 return -EINVAL;
1623
1624         if (!dev)
1625                 return -ENODEV;
1626
1627         ops = dev->rtnl_link_ops;
1628         if (!ops)
1629                 return -EOPNOTSUPP;
1630
1631         ops->dellink(dev, &list_kill);
1632         unregister_netdevice_many(&list_kill);
1633         list_del(&list_kill);
1634         return 0;
1635 }
1636
1637 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1638 {
1639         unsigned int old_flags;
1640         int err;
1641
1642         old_flags = dev->flags;
1643         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1644                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1645                 if (err < 0)
1646                         return err;
1647         }
1648
1649         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1650         rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1651
1652         __dev_notify_flags(dev, old_flags);
1653         return 0;
1654 }
1655 EXPORT_SYMBOL(rtnl_configure_link);
1656
1657 struct net_device *rtnl_create_link(struct net *net,
1658         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1659 {
1660         int err;
1661         struct net_device *dev;
1662         unsigned int num_tx_queues = 1;
1663         unsigned int num_rx_queues = 1;
1664
1665         if (tb[IFLA_NUM_TX_QUEUES])
1666                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1667         else if (ops->get_num_tx_queues)
1668                 num_tx_queues = ops->get_num_tx_queues();
1669
1670         if (tb[IFLA_NUM_RX_QUEUES])
1671                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1672         else if (ops->get_num_rx_queues)
1673                 num_rx_queues = ops->get_num_rx_queues();
1674
1675         err = -ENOMEM;
1676         dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup,
1677                                num_tx_queues, num_rx_queues);
1678         if (!dev)
1679                 goto err;
1680
1681         dev_net_set(dev, net);
1682         dev->rtnl_link_ops = ops;
1683         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1684
1685         if (tb[IFLA_MTU])
1686                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1687         if (tb[IFLA_ADDRESS]) {
1688                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1689                                 nla_len(tb[IFLA_ADDRESS]));
1690                 dev->addr_assign_type = NET_ADDR_SET;
1691         }
1692         if (tb[IFLA_BROADCAST])
1693                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1694                                 nla_len(tb[IFLA_BROADCAST]));
1695         if (tb[IFLA_TXQLEN])
1696                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1697         if (tb[IFLA_OPERSTATE])
1698                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1699         if (tb[IFLA_LINKMODE])
1700                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1701         if (tb[IFLA_GROUP])
1702                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1703
1704         return dev;
1705
1706 err:
1707         return ERR_PTR(err);
1708 }
1709 EXPORT_SYMBOL(rtnl_create_link);
1710
1711 static int rtnl_group_changelink(struct net *net, int group,
1712                 struct ifinfomsg *ifm,
1713                 struct nlattr **tb)
1714 {
1715         struct net_device *dev;
1716         int err;
1717
1718         for_each_netdev(net, dev) {
1719                 if (dev->group == group) {
1720                         err = do_setlink(dev, ifm, tb, NULL, 0);
1721                         if (err < 0)
1722                                 return err;
1723                 }
1724         }
1725
1726         return 0;
1727 }
1728
1729 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1730 {
1731         struct net *net = sock_net(skb->sk);
1732         const struct rtnl_link_ops *ops;
1733         struct net_device *dev;
1734         struct ifinfomsg *ifm;
1735         char kind[MODULE_NAME_LEN];
1736         char ifname[IFNAMSIZ];
1737         struct nlattr *tb[IFLA_MAX+1];
1738         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1739         int err;
1740
1741 #ifdef CONFIG_MODULES
1742 replay:
1743 #endif
1744         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1745         if (err < 0)
1746                 return err;
1747
1748         if (tb[IFLA_IFNAME])
1749                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1750         else
1751                 ifname[0] = '\0';
1752
1753         ifm = nlmsg_data(nlh);
1754         if (ifm->ifi_index > 0)
1755                 dev = __dev_get_by_index(net, ifm->ifi_index);
1756         else {
1757                 if (ifname[0])
1758                         dev = __dev_get_by_name(net, ifname);
1759                 else
1760                         dev = NULL;
1761         }
1762
1763         err = validate_linkmsg(dev, tb);
1764         if (err < 0)
1765                 return err;
1766
1767         if (tb[IFLA_LINKINFO]) {
1768                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1769                                        tb[IFLA_LINKINFO], ifla_info_policy);
1770                 if (err < 0)
1771                         return err;
1772         } else
1773                 memset(linkinfo, 0, sizeof(linkinfo));
1774
1775         if (linkinfo[IFLA_INFO_KIND]) {
1776                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1777                 ops = rtnl_link_ops_get(kind);
1778         } else {
1779                 kind[0] = '\0';
1780                 ops = NULL;
1781         }
1782
1783         if (1) {
1784                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1785                 struct net *dest_net;
1786
1787                 if (ops) {
1788                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1789                                 err = nla_parse_nested(attr, ops->maxtype,
1790                                                        linkinfo[IFLA_INFO_DATA],
1791                                                        ops->policy);
1792                                 if (err < 0)
1793                                         return err;
1794                                 data = attr;
1795                         }
1796                         if (ops->validate) {
1797                                 err = ops->validate(tb, data);
1798                                 if (err < 0)
1799                                         return err;
1800                         }
1801                 }
1802
1803                 if (dev) {
1804                         int modified = 0;
1805
1806                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1807                                 return -EEXIST;
1808                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1809                                 return -EOPNOTSUPP;
1810
1811                         if (linkinfo[IFLA_INFO_DATA]) {
1812                                 if (!ops || ops != dev->rtnl_link_ops ||
1813                                     !ops->changelink)
1814                                         return -EOPNOTSUPP;
1815
1816                                 err = ops->changelink(dev, tb, data);
1817                                 if (err < 0)
1818                                         return err;
1819                                 modified = 1;
1820                         }
1821
1822                         return do_setlink(dev, ifm, tb, ifname, modified);
1823                 }
1824
1825                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1826                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1827                                 return rtnl_group_changelink(net,
1828                                                 nla_get_u32(tb[IFLA_GROUP]),
1829                                                 ifm, tb);
1830                         return -ENODEV;
1831                 }
1832
1833                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1834                         return -EOPNOTSUPP;
1835
1836                 if (!ops) {
1837 #ifdef CONFIG_MODULES
1838                         if (kind[0]) {
1839                                 __rtnl_unlock();
1840                                 request_module("rtnl-link-%s", kind);
1841                                 rtnl_lock();
1842                                 ops = rtnl_link_ops_get(kind);
1843                                 if (ops)
1844                                         goto replay;
1845                         }
1846 #endif
1847                         return -EOPNOTSUPP;
1848                 }
1849
1850                 if (!ifname[0])
1851                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1852
1853                 dest_net = rtnl_link_get_net(net, tb);
1854                 if (IS_ERR(dest_net))
1855                         return PTR_ERR(dest_net);
1856
1857                 dev = rtnl_create_link(dest_net, ifname, ops, tb);
1858                 if (IS_ERR(dev)) {
1859                         err = PTR_ERR(dev);
1860                         goto out;
1861                 }
1862
1863                 dev->ifindex = ifm->ifi_index;
1864
1865                 if (ops->newlink)
1866                         err = ops->newlink(net, dev, tb, data);
1867                 else
1868                         err = register_netdevice(dev);
1869
1870                 if (err < 0 && !IS_ERR(dev))
1871                         free_netdev(dev);
1872                 if (err < 0)
1873                         goto out;
1874
1875                 err = rtnl_configure_link(dev, ifm);
1876                 if (err < 0)
1877                         unregister_netdevice(dev);
1878 out:
1879                 put_net(dest_net);
1880                 return err;
1881         }
1882 }
1883
1884 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
1885 {
1886         struct net *net = sock_net(skb->sk);
1887         struct ifinfomsg *ifm;
1888         char ifname[IFNAMSIZ];
1889         struct nlattr *tb[IFLA_MAX+1];
1890         struct net_device *dev = NULL;
1891         struct sk_buff *nskb;
1892         int err;
1893         u32 ext_filter_mask = 0;
1894
1895         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1896         if (err < 0)
1897                 return err;
1898
1899         if (tb[IFLA_IFNAME])
1900                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1901
1902         if (tb[IFLA_EXT_MASK])
1903                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1904
1905         ifm = nlmsg_data(nlh);
1906         if (ifm->ifi_index > 0)
1907                 dev = __dev_get_by_index(net, ifm->ifi_index);
1908         else if (tb[IFLA_IFNAME])
1909                 dev = __dev_get_by_name(net, ifname);
1910         else
1911                 return -EINVAL;
1912
1913         if (dev == NULL)
1914                 return -ENODEV;
1915
1916         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1917         if (nskb == NULL)
1918                 return -ENOBUFS;
1919
1920         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
1921                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1922         if (err < 0) {
1923                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1924                 WARN_ON(err == -EMSGSIZE);
1925                 kfree_skb(nskb);
1926         } else
1927                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
1928
1929         return err;
1930 }
1931
1932 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1933 {
1934         struct net *net = sock_net(skb->sk);
1935         struct net_device *dev;
1936         struct nlattr *tb[IFLA_MAX+1];
1937         u32 ext_filter_mask = 0;
1938         u16 min_ifinfo_dump_size = 0;
1939
1940         if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1941                         ifla_policy) >= 0) {
1942                 if (tb[IFLA_EXT_MASK])
1943                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1944         }
1945
1946         if (!ext_filter_mask)
1947                 return NLMSG_GOODSIZE;
1948         /*
1949          * traverse the list of net devices and compute the minimum
1950          * buffer size based upon the filter mask.
1951          */
1952         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1953                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1954                                              if_nlmsg_size(dev,
1955                                                            ext_filter_mask));
1956         }
1957
1958         return min_ifinfo_dump_size;
1959 }
1960
1961 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1962 {
1963         int idx;
1964         int s_idx = cb->family;
1965
1966         if (s_idx == 0)
1967                 s_idx = 1;
1968         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1969                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1970                 if (idx < s_idx || idx == PF_PACKET)
1971                         continue;
1972                 if (rtnl_msg_handlers[idx] == NULL ||
1973                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1974                         continue;
1975                 if (idx > s_idx) {
1976                         memset(&cb->args[0], 0, sizeof(cb->args));
1977                         cb->prev_seq = 0;
1978                         cb->seq = 0;
1979                 }
1980                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1981                         break;
1982         }
1983         cb->family = idx;
1984
1985         return skb->len;
1986 }
1987
1988 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change)
1989 {
1990         struct net *net = dev_net(dev);
1991         struct sk_buff *skb;
1992         int err = -ENOBUFS;
1993         size_t if_info_size;
1994
1995         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1996         if (skb == NULL)
1997                 goto errout;
1998
1999         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2000         if (err < 0) {
2001                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2002                 WARN_ON(err == -EMSGSIZE);
2003                 kfree_skb(skb);
2004                 goto errout;
2005         }
2006         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
2007         return;
2008 errout:
2009         if (err < 0)
2010                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2011 }
2012 EXPORT_SYMBOL(rtmsg_ifinfo);
2013
2014 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2015                                    struct net_device *dev,
2016                                    u8 *addr, u32 pid, u32 seq,
2017                                    int type, unsigned int flags)
2018 {
2019         struct nlmsghdr *nlh;
2020         struct ndmsg *ndm;
2021
2022         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI);
2023         if (!nlh)
2024                 return -EMSGSIZE;
2025
2026         ndm = nlmsg_data(nlh);
2027         ndm->ndm_family  = AF_BRIDGE;
2028         ndm->ndm_pad1    = 0;
2029         ndm->ndm_pad2    = 0;
2030         ndm->ndm_flags   = flags;
2031         ndm->ndm_type    = 0;
2032         ndm->ndm_ifindex = dev->ifindex;
2033         ndm->ndm_state   = NUD_PERMANENT;
2034
2035         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2036                 goto nla_put_failure;
2037
2038         return nlmsg_end(skb, nlh);
2039
2040 nla_put_failure:
2041         nlmsg_cancel(skb, nlh);
2042         return -EMSGSIZE;
2043 }
2044
2045 static inline size_t rtnl_fdb_nlmsg_size(void)
2046 {
2047         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2048 }
2049
2050 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2051 {
2052         struct net *net = dev_net(dev);
2053         struct sk_buff *skb;
2054         int err = -ENOBUFS;
2055
2056         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2057         if (!skb)
2058                 goto errout;
2059
2060         err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF);
2061         if (err < 0) {
2062                 kfree_skb(skb);
2063                 goto errout;
2064         }
2065
2066         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2067         return;
2068 errout:
2069         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2070 }
2071
2072 /**
2073  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2074  */
2075 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2076                      struct nlattr *tb[],
2077                      struct net_device *dev,
2078                      const unsigned char *addr,
2079                      u16 flags)
2080 {
2081         int err = -EINVAL;
2082
2083         /* If aging addresses are supported device will need to
2084          * implement its own handler for this.
2085          */
2086         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2087                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2088                 return err;
2089         }
2090
2091         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2092                 err = dev_uc_add_excl(dev, addr);
2093         else if (is_multicast_ether_addr(addr))
2094                 err = dev_mc_add_excl(dev, addr);
2095
2096         /* Only return duplicate errors if NLM_F_EXCL is set */
2097         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2098                 err = 0;
2099
2100         return err;
2101 }
2102 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2103
2104 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2105 {
2106         struct net *net = sock_net(skb->sk);
2107         struct ndmsg *ndm;
2108         struct nlattr *tb[NDA_MAX+1];
2109         struct net_device *dev;
2110         u8 *addr;
2111         int err;
2112
2113         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2114         if (err < 0)
2115                 return err;
2116
2117         ndm = nlmsg_data(nlh);
2118         if (ndm->ndm_ifindex == 0) {
2119                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2120                 return -EINVAL;
2121         }
2122
2123         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2124         if (dev == NULL) {
2125                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2126                 return -ENODEV;
2127         }
2128
2129         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2130                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2131                 return -EINVAL;
2132         }
2133
2134         addr = nla_data(tb[NDA_LLADDR]);
2135
2136         err = -EOPNOTSUPP;
2137
2138         /* Support fdb on master device the net/bridge default case */
2139         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2140             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2141                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2142                 const struct net_device_ops *ops = br_dev->netdev_ops;
2143
2144                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2145                 if (err)
2146                         goto out;
2147                 else
2148                         ndm->ndm_flags &= ~NTF_MASTER;
2149         }
2150
2151         /* Embedded bridge, macvlan, and any other device support */
2152         if ((ndm->ndm_flags & NTF_SELF)) {
2153                 if (dev->netdev_ops->ndo_fdb_add)
2154                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2155                                                            nlh->nlmsg_flags);
2156                 else
2157                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2158                                                nlh->nlmsg_flags);
2159
2160                 if (!err) {
2161                         rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2162                         ndm->ndm_flags &= ~NTF_SELF;
2163                 }
2164         }
2165 out:
2166         return err;
2167 }
2168
2169 /**
2170  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2171  */
2172 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2173                      struct nlattr *tb[],
2174                      struct net_device *dev,
2175                      const unsigned char *addr)
2176 {
2177         int err = -EOPNOTSUPP;
2178
2179         /* If aging addresses are supported device will need to
2180          * implement its own handler for this.
2181          */
2182         if (ndm->ndm_state & NUD_PERMANENT) {
2183                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2184                 return -EINVAL;
2185         }
2186
2187         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2188                 err = dev_uc_del(dev, addr);
2189         else if (is_multicast_ether_addr(addr))
2190                 err = dev_mc_del(dev, addr);
2191         else
2192                 err = -EINVAL;
2193
2194         return err;
2195 }
2196 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2197
2198 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2199 {
2200         struct net *net = sock_net(skb->sk);
2201         struct ndmsg *ndm;
2202         struct nlattr *tb[NDA_MAX+1];
2203         struct net_device *dev;
2204         int err = -EINVAL;
2205         __u8 *addr;
2206
2207         if (!capable(CAP_NET_ADMIN))
2208                 return -EPERM;
2209
2210         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2211         if (err < 0)
2212                 return err;
2213
2214         ndm = nlmsg_data(nlh);
2215         if (ndm->ndm_ifindex == 0) {
2216                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2217                 return -EINVAL;
2218         }
2219
2220         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2221         if (dev == NULL) {
2222                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2223                 return -ENODEV;
2224         }
2225
2226         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2227                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2228                 return -EINVAL;
2229         }
2230
2231         addr = nla_data(tb[NDA_LLADDR]);
2232
2233         err = -EOPNOTSUPP;
2234
2235         /* Support fdb on master device the net/bridge default case */
2236         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2237             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2238                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2239                 const struct net_device_ops *ops = br_dev->netdev_ops;
2240
2241                 if (ops->ndo_fdb_del)
2242                         err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2243
2244                 if (err)
2245                         goto out;
2246                 else
2247                         ndm->ndm_flags &= ~NTF_MASTER;
2248         }
2249
2250         /* Embedded bridge, macvlan, and any other device support */
2251         if (ndm->ndm_flags & NTF_SELF) {
2252                 if (dev->netdev_ops->ndo_fdb_del)
2253                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2254                 else
2255                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2256
2257                 if (!err) {
2258                         rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2259                         ndm->ndm_flags &= ~NTF_SELF;
2260                 }
2261         }
2262 out:
2263         return err;
2264 }
2265
2266 static int nlmsg_populate_fdb(struct sk_buff *skb,
2267                               struct netlink_callback *cb,
2268                               struct net_device *dev,
2269                               int *idx,
2270                               struct netdev_hw_addr_list *list)
2271 {
2272         struct netdev_hw_addr *ha;
2273         int err;
2274         u32 portid, seq;
2275
2276         portid = NETLINK_CB(cb->skb).portid;
2277         seq = cb->nlh->nlmsg_seq;
2278
2279         list_for_each_entry(ha, &list->list, list) {
2280                 if (*idx < cb->args[0])
2281                         goto skip;
2282
2283                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2284                                               portid, seq,
2285                                               RTM_NEWNEIGH, NTF_SELF);
2286                 if (err < 0)
2287                         return err;
2288 skip:
2289                 *idx += 1;
2290         }
2291         return 0;
2292 }
2293
2294 /**
2295  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2296  * @nlh: netlink message header
2297  * @dev: netdevice
2298  *
2299  * Default netdevice operation to dump the existing unicast address list.
2300  * Returns number of addresses from list put in skb.
2301  */
2302 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2303                       struct netlink_callback *cb,
2304                       struct net_device *dev,
2305                       int idx)
2306 {
2307         int err;
2308
2309         netif_addr_lock_bh(dev);
2310         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2311         if (err)
2312                 goto out;
2313         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2314 out:
2315         netif_addr_unlock_bh(dev);
2316         return idx;
2317 }
2318 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2319
2320 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2321 {
2322         int idx = 0;
2323         struct net *net = sock_net(skb->sk);
2324         struct net_device *dev;
2325
2326         rcu_read_lock();
2327         for_each_netdev_rcu(net, dev) {
2328                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2329                         struct net_device *br_dev;
2330                         const struct net_device_ops *ops;
2331
2332                         br_dev = netdev_master_upper_dev_get(dev);
2333                         ops = br_dev->netdev_ops;
2334                         if (ops->ndo_fdb_dump)
2335                                 idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
2336                 }
2337
2338                 if (dev->netdev_ops->ndo_fdb_dump)
2339                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
2340                 else
2341                         idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
2342         }
2343         rcu_read_unlock();
2344
2345         cb->args[0] = idx;
2346         return skb->len;
2347 }
2348
2349 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2350                             struct net_device *dev, u16 mode)
2351 {
2352         struct nlmsghdr *nlh;
2353         struct ifinfomsg *ifm;
2354         struct nlattr *br_afspec;
2355         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2356         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2357
2358         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2359         if (nlh == NULL)
2360                 return -EMSGSIZE;
2361
2362         ifm = nlmsg_data(nlh);
2363         ifm->ifi_family = AF_BRIDGE;
2364         ifm->__ifi_pad = 0;
2365         ifm->ifi_type = dev->type;
2366         ifm->ifi_index = dev->ifindex;
2367         ifm->ifi_flags = dev_get_flags(dev);
2368         ifm->ifi_change = 0;
2369
2370
2371         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2372             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2373             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2374             (br_dev &&
2375              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2376             (dev->addr_len &&
2377              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2378             (dev->ifindex != dev->iflink &&
2379              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2380                 goto nla_put_failure;
2381
2382         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2383         if (!br_afspec)
2384                 goto nla_put_failure;
2385
2386         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2387             nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2388                 nla_nest_cancel(skb, br_afspec);
2389                 goto nla_put_failure;
2390         }
2391         nla_nest_end(skb, br_afspec);
2392
2393         return nlmsg_end(skb, nlh);
2394 nla_put_failure:
2395         nlmsg_cancel(skb, nlh);
2396         return -EMSGSIZE;
2397 }
2398 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2399
2400 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2401 {
2402         struct net *net = sock_net(skb->sk);
2403         struct net_device *dev;
2404         int idx = 0;
2405         u32 portid = NETLINK_CB(cb->skb).portid;
2406         u32 seq = cb->nlh->nlmsg_seq;
2407         struct nlattr *extfilt;
2408         u32 filter_mask = 0;
2409
2410         extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct rtgenmsg),
2411                                   IFLA_EXT_MASK);
2412         if (extfilt)
2413                 filter_mask = nla_get_u32(extfilt);
2414
2415         rcu_read_lock();
2416         for_each_netdev_rcu(net, dev) {
2417                 const struct net_device_ops *ops = dev->netdev_ops;
2418                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2419
2420                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2421                         if (idx >= cb->args[0] &&
2422                             br_dev->netdev_ops->ndo_bridge_getlink(
2423                                     skb, portid, seq, dev, filter_mask) < 0)
2424                                 break;
2425                         idx++;
2426                 }
2427
2428                 if (ops->ndo_bridge_getlink) {
2429                         if (idx >= cb->args[0] &&
2430                             ops->ndo_bridge_getlink(skb, portid, seq, dev,
2431                                                     filter_mask) < 0)
2432                                 break;
2433                         idx++;
2434                 }
2435         }
2436         rcu_read_unlock();
2437         cb->args[0] = idx;
2438
2439         return skb->len;
2440 }
2441
2442 static inline size_t bridge_nlmsg_size(void)
2443 {
2444         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2445                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
2446                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
2447                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
2448                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
2449                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
2450                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
2451                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
2452                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2453                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
2454                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
2455 }
2456
2457 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2458 {
2459         struct net *net = dev_net(dev);
2460         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2461         struct sk_buff *skb;
2462         int err = -EOPNOTSUPP;
2463
2464         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2465         if (!skb) {
2466                 err = -ENOMEM;
2467                 goto errout;
2468         }
2469
2470         if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2471             br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2472                 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2473                 if (err < 0)
2474                         goto errout;
2475         }
2476
2477         if ((flags & BRIDGE_FLAGS_SELF) &&
2478             dev->netdev_ops->ndo_bridge_getlink) {
2479                 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2480                 if (err < 0)
2481                         goto errout;
2482         }
2483
2484         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2485         return 0;
2486 errout:
2487         WARN_ON(err == -EMSGSIZE);
2488         kfree_skb(skb);
2489         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2490         return err;
2491 }
2492
2493 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2494 {
2495         struct net *net = sock_net(skb->sk);
2496         struct ifinfomsg *ifm;
2497         struct net_device *dev;
2498         struct nlattr *br_spec, *attr = NULL;
2499         int rem, err = -EOPNOTSUPP;
2500         u16 oflags, flags = 0;
2501         bool have_flags = false;
2502
2503         if (nlmsg_len(nlh) < sizeof(*ifm))
2504                 return -EINVAL;
2505
2506         ifm = nlmsg_data(nlh);
2507         if (ifm->ifi_family != AF_BRIDGE)
2508                 return -EPFNOSUPPORT;
2509
2510         dev = __dev_get_by_index(net, ifm->ifi_index);
2511         if (!dev) {
2512                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2513                 return -ENODEV;
2514         }
2515
2516         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2517         if (br_spec) {
2518                 nla_for_each_nested(attr, br_spec, rem) {
2519                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2520                                 have_flags = true;
2521                                 flags = nla_get_u16(attr);
2522                                 break;
2523                         }
2524                 }
2525         }
2526
2527         oflags = flags;
2528
2529         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2530                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2531
2532                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2533                         err = -EOPNOTSUPP;
2534                         goto out;
2535                 }
2536
2537                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2538                 if (err)
2539                         goto out;
2540
2541                 flags &= ~BRIDGE_FLAGS_MASTER;
2542         }
2543
2544         if ((flags & BRIDGE_FLAGS_SELF)) {
2545                 if (!dev->netdev_ops->ndo_bridge_setlink)
2546                         err = -EOPNOTSUPP;
2547                 else
2548                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2549
2550                 if (!err)
2551                         flags &= ~BRIDGE_FLAGS_SELF;
2552         }
2553
2554         if (have_flags)
2555                 memcpy(nla_data(attr), &flags, sizeof(flags));
2556         /* Generate event to notify upper layer of bridge change */
2557         if (!err)
2558                 err = rtnl_bridge_notify(dev, oflags);
2559 out:
2560         return err;
2561 }
2562
2563 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2564 {
2565         struct net *net = sock_net(skb->sk);
2566         struct ifinfomsg *ifm;
2567         struct net_device *dev;
2568         struct nlattr *br_spec, *attr = NULL;
2569         int rem, err = -EOPNOTSUPP;
2570         u16 oflags, flags = 0;
2571         bool have_flags = false;
2572
2573         if (nlmsg_len(nlh) < sizeof(*ifm))
2574                 return -EINVAL;
2575
2576         ifm = nlmsg_data(nlh);
2577         if (ifm->ifi_family != AF_BRIDGE)
2578                 return -EPFNOSUPPORT;
2579
2580         dev = __dev_get_by_index(net, ifm->ifi_index);
2581         if (!dev) {
2582                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2583                 return -ENODEV;
2584         }
2585
2586         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2587         if (br_spec) {
2588                 nla_for_each_nested(attr, br_spec, rem) {
2589                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2590                                 have_flags = true;
2591                                 flags = nla_get_u16(attr);
2592                                 break;
2593                         }
2594                 }
2595         }
2596
2597         oflags = flags;
2598
2599         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2600                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2601
2602                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2603                         err = -EOPNOTSUPP;
2604                         goto out;
2605                 }
2606
2607                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2608                 if (err)
2609                         goto out;
2610
2611                 flags &= ~BRIDGE_FLAGS_MASTER;
2612         }
2613
2614         if ((flags & BRIDGE_FLAGS_SELF)) {
2615                 if (!dev->netdev_ops->ndo_bridge_dellink)
2616                         err = -EOPNOTSUPP;
2617                 else
2618                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2619
2620                 if (!err)
2621                         flags &= ~BRIDGE_FLAGS_SELF;
2622         }
2623
2624         if (have_flags)
2625                 memcpy(nla_data(attr), &flags, sizeof(flags));
2626         /* Generate event to notify upper layer of bridge change */
2627         if (!err)
2628                 err = rtnl_bridge_notify(dev, oflags);
2629 out:
2630         return err;
2631 }
2632
2633 /* Process one rtnetlink message. */
2634
2635 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2636 {
2637         struct net *net = sock_net(skb->sk);
2638         rtnl_doit_func doit;
2639         int sz_idx, kind;
2640         int family;
2641         int type;
2642         int err;
2643
2644         type = nlh->nlmsg_type;
2645         if (type > RTM_MAX)
2646                 return -EOPNOTSUPP;
2647
2648         type -= RTM_BASE;
2649
2650         /* All the messages must have at least 1 byte length */
2651         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2652                 return 0;
2653
2654         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2655         sz_idx = type>>2;
2656         kind = type&3;
2657
2658         if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2659                 return -EPERM;
2660
2661         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2662                 struct sock *rtnl;
2663                 rtnl_dumpit_func dumpit;
2664                 rtnl_calcit_func calcit;
2665                 u16 min_dump_alloc = 0;
2666
2667                 dumpit = rtnl_get_dumpit(family, type);
2668                 if (dumpit == NULL)
2669                         return -EOPNOTSUPP;
2670                 calcit = rtnl_get_calcit(family, type);
2671                 if (calcit)
2672                         min_dump_alloc = calcit(skb, nlh);
2673
2674                 __rtnl_unlock();
2675                 rtnl = net->rtnl;
2676                 {
2677                         struct netlink_dump_control c = {
2678                                 .dump           = dumpit,
2679                                 .min_dump_alloc = min_dump_alloc,
2680                         };
2681                         err = netlink_dump_start(rtnl, skb, nlh, &c);
2682                 }
2683                 rtnl_lock();
2684                 return err;
2685         }
2686
2687         doit = rtnl_get_doit(family, type);
2688         if (doit == NULL)
2689                 return -EOPNOTSUPP;
2690
2691         return doit(skb, nlh);
2692 }
2693
2694 static void rtnetlink_rcv(struct sk_buff *skb)
2695 {
2696         rtnl_lock();
2697         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2698         rtnl_unlock();
2699 }
2700
2701 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2702 {
2703         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2704
2705         switch (event) {
2706         case NETDEV_UP:
2707         case NETDEV_DOWN:
2708         case NETDEV_PRE_UP:
2709         case NETDEV_POST_INIT:
2710         case NETDEV_REGISTER:
2711         case NETDEV_CHANGE:
2712         case NETDEV_PRE_TYPE_CHANGE:
2713         case NETDEV_GOING_DOWN:
2714         case NETDEV_UNREGISTER:
2715         case NETDEV_UNREGISTER_FINAL:
2716         case NETDEV_RELEASE:
2717         case NETDEV_JOIN:
2718                 break;
2719         default:
2720                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2721                 break;
2722         }
2723         return NOTIFY_DONE;
2724 }
2725
2726 static struct notifier_block rtnetlink_dev_notifier = {
2727         .notifier_call  = rtnetlink_event,
2728 };
2729
2730
2731 static int __net_init rtnetlink_net_init(struct net *net)
2732 {
2733         struct sock *sk;
2734         struct netlink_kernel_cfg cfg = {
2735                 .groups         = RTNLGRP_MAX,
2736                 .input          = rtnetlink_rcv,
2737                 .cb_mutex       = &rtnl_mutex,
2738                 .flags          = NL_CFG_F_NONROOT_RECV,
2739         };
2740
2741         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
2742         if (!sk)
2743                 return -ENOMEM;
2744         net->rtnl = sk;
2745         return 0;
2746 }
2747
2748 static void __net_exit rtnetlink_net_exit(struct net *net)
2749 {
2750         netlink_kernel_release(net->rtnl);
2751         net->rtnl = NULL;
2752 }
2753
2754 static struct pernet_operations rtnetlink_net_ops = {
2755         .init = rtnetlink_net_init,
2756         .exit = rtnetlink_net_exit,
2757 };
2758
2759 void __init rtnetlink_init(void)
2760 {
2761         if (register_pernet_subsys(&rtnetlink_net_ops))
2762                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2763
2764         register_netdevice_notifier(&rtnetlink_dev_notifier);
2765
2766         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2767                       rtnl_dump_ifinfo, rtnl_calcit);
2768         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2769         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2770         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2771
2772         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2773         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2774
2775         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
2776         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
2777         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
2778
2779         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
2780         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
2781         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
2782 }
2783