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
1651         __dev_notify_flags(dev, old_flags, ~0U);
1652         return 0;
1653 }
1654 EXPORT_SYMBOL(rtnl_configure_link);
1655
1656 struct net_device *rtnl_create_link(struct net *net,
1657         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1658 {
1659         int err;
1660         struct net_device *dev;
1661         unsigned int num_tx_queues = 1;
1662         unsigned int num_rx_queues = 1;
1663
1664         if (tb[IFLA_NUM_TX_QUEUES])
1665                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1666         else if (ops->get_num_tx_queues)
1667                 num_tx_queues = ops->get_num_tx_queues();
1668
1669         if (tb[IFLA_NUM_RX_QUEUES])
1670                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1671         else if (ops->get_num_rx_queues)
1672                 num_rx_queues = ops->get_num_rx_queues();
1673
1674         err = -ENOMEM;
1675         dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup,
1676                                num_tx_queues, num_rx_queues);
1677         if (!dev)
1678                 goto err;
1679
1680         dev_net_set(dev, net);
1681         dev->rtnl_link_ops = ops;
1682         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1683
1684         if (tb[IFLA_MTU])
1685                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1686         if (tb[IFLA_ADDRESS]) {
1687                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1688                                 nla_len(tb[IFLA_ADDRESS]));
1689                 dev->addr_assign_type = NET_ADDR_SET;
1690         }
1691         if (tb[IFLA_BROADCAST])
1692                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1693                                 nla_len(tb[IFLA_BROADCAST]));
1694         if (tb[IFLA_TXQLEN])
1695                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1696         if (tb[IFLA_OPERSTATE])
1697                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1698         if (tb[IFLA_LINKMODE])
1699                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1700         if (tb[IFLA_GROUP])
1701                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1702
1703         return dev;
1704
1705 err:
1706         return ERR_PTR(err);
1707 }
1708 EXPORT_SYMBOL(rtnl_create_link);
1709
1710 static int rtnl_group_changelink(struct net *net, int group,
1711                 struct ifinfomsg *ifm,
1712                 struct nlattr **tb)
1713 {
1714         struct net_device *dev;
1715         int err;
1716
1717         for_each_netdev(net, dev) {
1718                 if (dev->group == group) {
1719                         err = do_setlink(dev, ifm, tb, NULL, 0);
1720                         if (err < 0)
1721                                 return err;
1722                 }
1723         }
1724
1725         return 0;
1726 }
1727
1728 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1729 {
1730         struct net *net = sock_net(skb->sk);
1731         const struct rtnl_link_ops *ops;
1732         struct net_device *dev;
1733         struct ifinfomsg *ifm;
1734         char kind[MODULE_NAME_LEN];
1735         char ifname[IFNAMSIZ];
1736         struct nlattr *tb[IFLA_MAX+1];
1737         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1738         int err;
1739
1740 #ifdef CONFIG_MODULES
1741 replay:
1742 #endif
1743         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1744         if (err < 0)
1745                 return err;
1746
1747         if (tb[IFLA_IFNAME])
1748                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1749         else
1750                 ifname[0] = '\0';
1751
1752         ifm = nlmsg_data(nlh);
1753         if (ifm->ifi_index > 0)
1754                 dev = __dev_get_by_index(net, ifm->ifi_index);
1755         else {
1756                 if (ifname[0])
1757                         dev = __dev_get_by_name(net, ifname);
1758                 else
1759                         dev = NULL;
1760         }
1761
1762         err = validate_linkmsg(dev, tb);
1763         if (err < 0)
1764                 return err;
1765
1766         if (tb[IFLA_LINKINFO]) {
1767                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1768                                        tb[IFLA_LINKINFO], ifla_info_policy);
1769                 if (err < 0)
1770                         return err;
1771         } else
1772                 memset(linkinfo, 0, sizeof(linkinfo));
1773
1774         if (linkinfo[IFLA_INFO_KIND]) {
1775                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1776                 ops = rtnl_link_ops_get(kind);
1777         } else {
1778                 kind[0] = '\0';
1779                 ops = NULL;
1780         }
1781
1782         if (1) {
1783                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1784                 struct net *dest_net;
1785
1786                 if (ops) {
1787                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1788                                 err = nla_parse_nested(attr, ops->maxtype,
1789                                                        linkinfo[IFLA_INFO_DATA],
1790                                                        ops->policy);
1791                                 if (err < 0)
1792                                         return err;
1793                                 data = attr;
1794                         }
1795                         if (ops->validate) {
1796                                 err = ops->validate(tb, data);
1797                                 if (err < 0)
1798                                         return err;
1799                         }
1800                 }
1801
1802                 if (dev) {
1803                         int modified = 0;
1804
1805                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1806                                 return -EEXIST;
1807                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1808                                 return -EOPNOTSUPP;
1809
1810                         if (linkinfo[IFLA_INFO_DATA]) {
1811                                 if (!ops || ops != dev->rtnl_link_ops ||
1812                                     !ops->changelink)
1813                                         return -EOPNOTSUPP;
1814
1815                                 err = ops->changelink(dev, tb, data);
1816                                 if (err < 0)
1817                                         return err;
1818                                 modified = 1;
1819                         }
1820
1821                         return do_setlink(dev, ifm, tb, ifname, modified);
1822                 }
1823
1824                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1825                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1826                                 return rtnl_group_changelink(net,
1827                                                 nla_get_u32(tb[IFLA_GROUP]),
1828                                                 ifm, tb);
1829                         return -ENODEV;
1830                 }
1831
1832                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1833                         return -EOPNOTSUPP;
1834
1835                 if (!ops) {
1836 #ifdef CONFIG_MODULES
1837                         if (kind[0]) {
1838                                 __rtnl_unlock();
1839                                 request_module("rtnl-link-%s", kind);
1840                                 rtnl_lock();
1841                                 ops = rtnl_link_ops_get(kind);
1842                                 if (ops)
1843                                         goto replay;
1844                         }
1845 #endif
1846                         return -EOPNOTSUPP;
1847                 }
1848
1849                 if (!ifname[0])
1850                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1851
1852                 dest_net = rtnl_link_get_net(net, tb);
1853                 if (IS_ERR(dest_net))
1854                         return PTR_ERR(dest_net);
1855
1856                 dev = rtnl_create_link(dest_net, ifname, ops, tb);
1857                 if (IS_ERR(dev)) {
1858                         err = PTR_ERR(dev);
1859                         goto out;
1860                 }
1861
1862                 dev->ifindex = ifm->ifi_index;
1863
1864                 if (ops->newlink)
1865                         err = ops->newlink(net, dev, tb, data);
1866                 else
1867                         err = register_netdevice(dev);
1868
1869                 if (err < 0) {
1870                         free_netdev(dev);
1871                         goto out;
1872                 }
1873
1874                 err = rtnl_configure_link(dev, ifm);
1875                 if (err < 0)
1876                         unregister_netdevice(dev);
1877 out:
1878                 put_net(dest_net);
1879                 return err;
1880         }
1881 }
1882
1883 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
1884 {
1885         struct net *net = sock_net(skb->sk);
1886         struct ifinfomsg *ifm;
1887         char ifname[IFNAMSIZ];
1888         struct nlattr *tb[IFLA_MAX+1];
1889         struct net_device *dev = NULL;
1890         struct sk_buff *nskb;
1891         int err;
1892         u32 ext_filter_mask = 0;
1893
1894         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1895         if (err < 0)
1896                 return err;
1897
1898         if (tb[IFLA_IFNAME])
1899                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1900
1901         if (tb[IFLA_EXT_MASK])
1902                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1903
1904         ifm = nlmsg_data(nlh);
1905         if (ifm->ifi_index > 0)
1906                 dev = __dev_get_by_index(net, ifm->ifi_index);
1907         else if (tb[IFLA_IFNAME])
1908                 dev = __dev_get_by_name(net, ifname);
1909         else
1910                 return -EINVAL;
1911
1912         if (dev == NULL)
1913                 return -ENODEV;
1914
1915         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1916         if (nskb == NULL)
1917                 return -ENOBUFS;
1918
1919         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
1920                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1921         if (err < 0) {
1922                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1923                 WARN_ON(err == -EMSGSIZE);
1924                 kfree_skb(nskb);
1925         } else
1926                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
1927
1928         return err;
1929 }
1930
1931 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1932 {
1933         struct net *net = sock_net(skb->sk);
1934         struct net_device *dev;
1935         struct nlattr *tb[IFLA_MAX+1];
1936         u32 ext_filter_mask = 0;
1937         u16 min_ifinfo_dump_size = 0;
1938
1939         if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1940                         ifla_policy) >= 0) {
1941                 if (tb[IFLA_EXT_MASK])
1942                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1943         }
1944
1945         if (!ext_filter_mask)
1946                 return NLMSG_GOODSIZE;
1947         /*
1948          * traverse the list of net devices and compute the minimum
1949          * buffer size based upon the filter mask.
1950          */
1951         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1952                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1953                                              if_nlmsg_size(dev,
1954                                                            ext_filter_mask));
1955         }
1956
1957         return min_ifinfo_dump_size;
1958 }
1959
1960 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1961 {
1962         int idx;
1963         int s_idx = cb->family;
1964
1965         if (s_idx == 0)
1966                 s_idx = 1;
1967         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1968                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1969                 if (idx < s_idx || idx == PF_PACKET)
1970                         continue;
1971                 if (rtnl_msg_handlers[idx] == NULL ||
1972                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1973                         continue;
1974                 if (idx > s_idx) {
1975                         memset(&cb->args[0], 0, sizeof(cb->args));
1976                         cb->prev_seq = 0;
1977                         cb->seq = 0;
1978                 }
1979                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1980                         break;
1981         }
1982         cb->family = idx;
1983
1984         return skb->len;
1985 }
1986
1987 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change)
1988 {
1989         struct net *net = dev_net(dev);
1990         struct sk_buff *skb;
1991         int err = -ENOBUFS;
1992         size_t if_info_size;
1993
1994         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1995         if (skb == NULL)
1996                 goto errout;
1997
1998         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1999         if (err < 0) {
2000                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2001                 WARN_ON(err == -EMSGSIZE);
2002                 kfree_skb(skb);
2003                 goto errout;
2004         }
2005         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
2006         return;
2007 errout:
2008         if (err < 0)
2009                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2010 }
2011 EXPORT_SYMBOL(rtmsg_ifinfo);
2012
2013 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2014                                    struct net_device *dev,
2015                                    u8 *addr, u32 pid, u32 seq,
2016                                    int type, unsigned int flags)
2017 {
2018         struct nlmsghdr *nlh;
2019         struct ndmsg *ndm;
2020
2021         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI);
2022         if (!nlh)
2023                 return -EMSGSIZE;
2024
2025         ndm = nlmsg_data(nlh);
2026         ndm->ndm_family  = AF_BRIDGE;
2027         ndm->ndm_pad1    = 0;
2028         ndm->ndm_pad2    = 0;
2029         ndm->ndm_flags   = flags;
2030         ndm->ndm_type    = 0;
2031         ndm->ndm_ifindex = dev->ifindex;
2032         ndm->ndm_state   = NUD_PERMANENT;
2033
2034         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2035                 goto nla_put_failure;
2036
2037         return nlmsg_end(skb, nlh);
2038
2039 nla_put_failure:
2040         nlmsg_cancel(skb, nlh);
2041         return -EMSGSIZE;
2042 }
2043
2044 static inline size_t rtnl_fdb_nlmsg_size(void)
2045 {
2046         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2047 }
2048
2049 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2050 {
2051         struct net *net = dev_net(dev);
2052         struct sk_buff *skb;
2053         int err = -ENOBUFS;
2054
2055         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2056         if (!skb)
2057                 goto errout;
2058
2059         err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF);
2060         if (err < 0) {
2061                 kfree_skb(skb);
2062                 goto errout;
2063         }
2064
2065         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2066         return;
2067 errout:
2068         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2069 }
2070
2071 /**
2072  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2073  */
2074 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2075                      struct nlattr *tb[],
2076                      struct net_device *dev,
2077                      const unsigned char *addr,
2078                      u16 flags)
2079 {
2080         int err = -EINVAL;
2081
2082         /* If aging addresses are supported device will need to
2083          * implement its own handler for this.
2084          */
2085         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2086                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2087                 return err;
2088         }
2089
2090         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2091                 err = dev_uc_add_excl(dev, addr);
2092         else if (is_multicast_ether_addr(addr))
2093                 err = dev_mc_add_excl(dev, addr);
2094
2095         /* Only return duplicate errors if NLM_F_EXCL is set */
2096         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2097                 err = 0;
2098
2099         return err;
2100 }
2101 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2102
2103 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2104 {
2105         struct net *net = sock_net(skb->sk);
2106         struct ndmsg *ndm;
2107         struct nlattr *tb[NDA_MAX+1];
2108         struct net_device *dev;
2109         u8 *addr;
2110         int err;
2111
2112         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2113         if (err < 0)
2114                 return err;
2115
2116         ndm = nlmsg_data(nlh);
2117         if (ndm->ndm_ifindex == 0) {
2118                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2119                 return -EINVAL;
2120         }
2121
2122         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2123         if (dev == NULL) {
2124                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2125                 return -ENODEV;
2126         }
2127
2128         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2129                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2130                 return -EINVAL;
2131         }
2132
2133         addr = nla_data(tb[NDA_LLADDR]);
2134
2135         err = -EOPNOTSUPP;
2136
2137         /* Support fdb on master device the net/bridge default case */
2138         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2139             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2140                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2141                 const struct net_device_ops *ops = br_dev->netdev_ops;
2142
2143                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2144                 if (err)
2145                         goto out;
2146                 else
2147                         ndm->ndm_flags &= ~NTF_MASTER;
2148         }
2149
2150         /* Embedded bridge, macvlan, and any other device support */
2151         if ((ndm->ndm_flags & NTF_SELF)) {
2152                 if (dev->netdev_ops->ndo_fdb_add)
2153                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2154                                                            nlh->nlmsg_flags);
2155                 else
2156                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2157                                                nlh->nlmsg_flags);
2158
2159                 if (!err) {
2160                         rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2161                         ndm->ndm_flags &= ~NTF_SELF;
2162                 }
2163         }
2164 out:
2165         return err;
2166 }
2167
2168 /**
2169  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2170  */
2171 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2172                      struct nlattr *tb[],
2173                      struct net_device *dev,
2174                      const unsigned char *addr)
2175 {
2176         int err = -EOPNOTSUPP;
2177
2178         /* If aging addresses are supported device will need to
2179          * implement its own handler for this.
2180          */
2181         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2182                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2183                 return -EINVAL;
2184         }
2185
2186         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2187                 err = dev_uc_del(dev, addr);
2188         else if (is_multicast_ether_addr(addr))
2189                 err = dev_mc_del(dev, addr);
2190         else
2191                 err = -EINVAL;
2192
2193         return err;
2194 }
2195 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2196
2197 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2198 {
2199         struct net *net = sock_net(skb->sk);
2200         struct ndmsg *ndm;
2201         struct nlattr *tb[NDA_MAX+1];
2202         struct net_device *dev;
2203         int err = -EINVAL;
2204         __u8 *addr;
2205
2206         if (!capable(CAP_NET_ADMIN))
2207                 return -EPERM;
2208
2209         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2210         if (err < 0)
2211                 return err;
2212
2213         ndm = nlmsg_data(nlh);
2214         if (ndm->ndm_ifindex == 0) {
2215                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2216                 return -EINVAL;
2217         }
2218
2219         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2220         if (dev == NULL) {
2221                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2222                 return -ENODEV;
2223         }
2224
2225         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2226                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2227                 return -EINVAL;
2228         }
2229
2230         addr = nla_data(tb[NDA_LLADDR]);
2231
2232         err = -EOPNOTSUPP;
2233
2234         /* Support fdb on master device the net/bridge default case */
2235         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2236             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2237                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2238                 const struct net_device_ops *ops = br_dev->netdev_ops;
2239
2240                 if (ops->ndo_fdb_del)
2241                         err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2242
2243                 if (err)
2244                         goto out;
2245                 else
2246                         ndm->ndm_flags &= ~NTF_MASTER;
2247         }
2248
2249         /* Embedded bridge, macvlan, and any other device support */
2250         if (ndm->ndm_flags & NTF_SELF) {
2251                 if (dev->netdev_ops->ndo_fdb_del)
2252                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2253                 else
2254                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2255
2256                 if (!err) {
2257                         rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2258                         ndm->ndm_flags &= ~NTF_SELF;
2259                 }
2260         }
2261 out:
2262         return err;
2263 }
2264
2265 static int nlmsg_populate_fdb(struct sk_buff *skb,
2266                               struct netlink_callback *cb,
2267                               struct net_device *dev,
2268                               int *idx,
2269                               struct netdev_hw_addr_list *list)
2270 {
2271         struct netdev_hw_addr *ha;
2272         int err;
2273         u32 portid, seq;
2274
2275         portid = NETLINK_CB(cb->skb).portid;
2276         seq = cb->nlh->nlmsg_seq;
2277
2278         list_for_each_entry(ha, &list->list, list) {
2279                 if (*idx < cb->args[0])
2280                         goto skip;
2281
2282                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2283                                               portid, seq,
2284                                               RTM_NEWNEIGH, NTF_SELF);
2285                 if (err < 0)
2286                         return err;
2287 skip:
2288                 *idx += 1;
2289         }
2290         return 0;
2291 }
2292
2293 /**
2294  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2295  * @nlh: netlink message header
2296  * @dev: netdevice
2297  *
2298  * Default netdevice operation to dump the existing unicast address list.
2299  * Returns number of addresses from list put in skb.
2300  */
2301 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2302                       struct netlink_callback *cb,
2303                       struct net_device *dev,
2304                       int idx)
2305 {
2306         int err;
2307
2308         netif_addr_lock_bh(dev);
2309         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2310         if (err)
2311                 goto out;
2312         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2313 out:
2314         netif_addr_unlock_bh(dev);
2315         return idx;
2316 }
2317 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2318
2319 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2320 {
2321         int idx = 0;
2322         struct net *net = sock_net(skb->sk);
2323         struct net_device *dev;
2324
2325         rcu_read_lock();
2326         for_each_netdev_rcu(net, dev) {
2327                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2328                         struct net_device *br_dev;
2329                         const struct net_device_ops *ops;
2330
2331                         br_dev = netdev_master_upper_dev_get(dev);
2332                         ops = br_dev->netdev_ops;
2333                         if (ops->ndo_fdb_dump)
2334                                 idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
2335                 }
2336
2337                 if (dev->netdev_ops->ndo_fdb_dump)
2338                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
2339                 else
2340                         idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
2341         }
2342         rcu_read_unlock();
2343
2344         cb->args[0] = idx;
2345         return skb->len;
2346 }
2347
2348 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2349                             struct net_device *dev, u16 mode)
2350 {
2351         struct nlmsghdr *nlh;
2352         struct ifinfomsg *ifm;
2353         struct nlattr *br_afspec;
2354         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2355         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2356
2357         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2358         if (nlh == NULL)
2359                 return -EMSGSIZE;
2360
2361         ifm = nlmsg_data(nlh);
2362         ifm->ifi_family = AF_BRIDGE;
2363         ifm->__ifi_pad = 0;
2364         ifm->ifi_type = dev->type;
2365         ifm->ifi_index = dev->ifindex;
2366         ifm->ifi_flags = dev_get_flags(dev);
2367         ifm->ifi_change = 0;
2368
2369
2370         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2371             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2372             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2373             (br_dev &&
2374              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2375             (dev->addr_len &&
2376              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2377             (dev->ifindex != dev->iflink &&
2378              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2379                 goto nla_put_failure;
2380
2381         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2382         if (!br_afspec)
2383                 goto nla_put_failure;
2384
2385         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2386             nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2387                 nla_nest_cancel(skb, br_afspec);
2388                 goto nla_put_failure;
2389         }
2390         nla_nest_end(skb, br_afspec);
2391
2392         return nlmsg_end(skb, nlh);
2393 nla_put_failure:
2394         nlmsg_cancel(skb, nlh);
2395         return -EMSGSIZE;
2396 }
2397 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2398
2399 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2400 {
2401         struct net *net = sock_net(skb->sk);
2402         struct net_device *dev;
2403         int idx = 0;
2404         u32 portid = NETLINK_CB(cb->skb).portid;
2405         u32 seq = cb->nlh->nlmsg_seq;
2406         struct nlattr *extfilt;
2407         u32 filter_mask = 0;
2408
2409         extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2410                                   IFLA_EXT_MASK);
2411         if (extfilt)
2412                 filter_mask = nla_get_u32(extfilt);
2413
2414         rcu_read_lock();
2415         for_each_netdev_rcu(net, dev) {
2416                 const struct net_device_ops *ops = dev->netdev_ops;
2417                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2418
2419                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2420                         if (idx >= cb->args[0] &&
2421                             br_dev->netdev_ops->ndo_bridge_getlink(
2422                                     skb, portid, seq, dev, filter_mask) < 0)
2423                                 break;
2424                         idx++;
2425                 }
2426
2427                 if (ops->ndo_bridge_getlink) {
2428                         if (idx >= cb->args[0] &&
2429                             ops->ndo_bridge_getlink(skb, portid, seq, dev,
2430                                                     filter_mask) < 0)
2431                                 break;
2432                         idx++;
2433                 }
2434         }
2435         rcu_read_unlock();
2436         cb->args[0] = idx;
2437
2438         return skb->len;
2439 }
2440
2441 static inline size_t bridge_nlmsg_size(void)
2442 {
2443         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2444                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
2445                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
2446                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
2447                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
2448                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
2449                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
2450                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
2451                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2452                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
2453                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
2454 }
2455
2456 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2457 {
2458         struct net *net = dev_net(dev);
2459         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2460         struct sk_buff *skb;
2461         int err = -EOPNOTSUPP;
2462
2463         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2464         if (!skb) {
2465                 err = -ENOMEM;
2466                 goto errout;
2467         }
2468
2469         if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2470             br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2471                 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2472                 if (err < 0)
2473                         goto errout;
2474         }
2475
2476         if ((flags & BRIDGE_FLAGS_SELF) &&
2477             dev->netdev_ops->ndo_bridge_getlink) {
2478                 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2479                 if (err < 0)
2480                         goto errout;
2481         }
2482
2483         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2484         return 0;
2485 errout:
2486         WARN_ON(err == -EMSGSIZE);
2487         kfree_skb(skb);
2488         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2489         return err;
2490 }
2491
2492 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2493 {
2494         struct net *net = sock_net(skb->sk);
2495         struct ifinfomsg *ifm;
2496         struct net_device *dev;
2497         struct nlattr *br_spec, *attr = NULL;
2498         int rem, err = -EOPNOTSUPP;
2499         u16 oflags, flags = 0;
2500         bool have_flags = false;
2501
2502         if (nlmsg_len(nlh) < sizeof(*ifm))
2503                 return -EINVAL;
2504
2505         ifm = nlmsg_data(nlh);
2506         if (ifm->ifi_family != AF_BRIDGE)
2507                 return -EPFNOSUPPORT;
2508
2509         dev = __dev_get_by_index(net, ifm->ifi_index);
2510         if (!dev) {
2511                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2512                 return -ENODEV;
2513         }
2514
2515         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2516         if (br_spec) {
2517                 nla_for_each_nested(attr, br_spec, rem) {
2518                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2519                                 have_flags = true;
2520                                 flags = nla_get_u16(attr);
2521                                 break;
2522                         }
2523                 }
2524         }
2525
2526         oflags = flags;
2527
2528         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2529                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2530
2531                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2532                         err = -EOPNOTSUPP;
2533                         goto out;
2534                 }
2535
2536                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2537                 if (err)
2538                         goto out;
2539
2540                 flags &= ~BRIDGE_FLAGS_MASTER;
2541         }
2542
2543         if ((flags & BRIDGE_FLAGS_SELF)) {
2544                 if (!dev->netdev_ops->ndo_bridge_setlink)
2545                         err = -EOPNOTSUPP;
2546                 else
2547                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2548
2549                 if (!err)
2550                         flags &= ~BRIDGE_FLAGS_SELF;
2551         }
2552
2553         if (have_flags)
2554                 memcpy(nla_data(attr), &flags, sizeof(flags));
2555         /* Generate event to notify upper layer of bridge change */
2556         if (!err)
2557                 err = rtnl_bridge_notify(dev, oflags);
2558 out:
2559         return err;
2560 }
2561
2562 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2563 {
2564         struct net *net = sock_net(skb->sk);
2565         struct ifinfomsg *ifm;
2566         struct net_device *dev;
2567         struct nlattr *br_spec, *attr = NULL;
2568         int rem, err = -EOPNOTSUPP;
2569         u16 oflags, flags = 0;
2570         bool have_flags = false;
2571
2572         if (nlmsg_len(nlh) < sizeof(*ifm))
2573                 return -EINVAL;
2574
2575         ifm = nlmsg_data(nlh);
2576         if (ifm->ifi_family != AF_BRIDGE)
2577                 return -EPFNOSUPPORT;
2578
2579         dev = __dev_get_by_index(net, ifm->ifi_index);
2580         if (!dev) {
2581                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2582                 return -ENODEV;
2583         }
2584
2585         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2586         if (br_spec) {
2587                 nla_for_each_nested(attr, br_spec, rem) {
2588                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2589                                 have_flags = true;
2590                                 flags = nla_get_u16(attr);
2591                                 break;
2592                         }
2593                 }
2594         }
2595
2596         oflags = flags;
2597
2598         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2599                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2600
2601                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2602                         err = -EOPNOTSUPP;
2603                         goto out;
2604                 }
2605
2606                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2607                 if (err)
2608                         goto out;
2609
2610                 flags &= ~BRIDGE_FLAGS_MASTER;
2611         }
2612
2613         if ((flags & BRIDGE_FLAGS_SELF)) {
2614                 if (!dev->netdev_ops->ndo_bridge_dellink)
2615                         err = -EOPNOTSUPP;
2616                 else
2617                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2618
2619                 if (!err)
2620                         flags &= ~BRIDGE_FLAGS_SELF;
2621         }
2622
2623         if (have_flags)
2624                 memcpy(nla_data(attr), &flags, sizeof(flags));
2625         /* Generate event to notify upper layer of bridge change */
2626         if (!err)
2627                 err = rtnl_bridge_notify(dev, oflags);
2628 out:
2629         return err;
2630 }
2631
2632 /* Process one rtnetlink message. */
2633
2634 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2635 {
2636         struct net *net = sock_net(skb->sk);
2637         rtnl_doit_func doit;
2638         int sz_idx, kind;
2639         int family;
2640         int type;
2641         int err;
2642
2643         type = nlh->nlmsg_type;
2644         if (type > RTM_MAX)
2645                 return -EOPNOTSUPP;
2646
2647         type -= RTM_BASE;
2648
2649         /* All the messages must have at least 1 byte length */
2650         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2651                 return 0;
2652
2653         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2654         sz_idx = type>>2;
2655         kind = type&3;
2656
2657         if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2658                 return -EPERM;
2659
2660         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2661                 struct sock *rtnl;
2662                 rtnl_dumpit_func dumpit;
2663                 rtnl_calcit_func calcit;
2664                 u16 min_dump_alloc = 0;
2665
2666                 dumpit = rtnl_get_dumpit(family, type);
2667                 if (dumpit == NULL)
2668                         return -EOPNOTSUPP;
2669                 calcit = rtnl_get_calcit(family, type);
2670                 if (calcit)
2671                         min_dump_alloc = calcit(skb, nlh);
2672
2673                 __rtnl_unlock();
2674                 rtnl = net->rtnl;
2675                 {
2676                         struct netlink_dump_control c = {
2677                                 .dump           = dumpit,
2678                                 .min_dump_alloc = min_dump_alloc,
2679                         };
2680                         err = netlink_dump_start(rtnl, skb, nlh, &c);
2681                 }
2682                 rtnl_lock();
2683                 return err;
2684         }
2685
2686         doit = rtnl_get_doit(family, type);
2687         if (doit == NULL)
2688                 return -EOPNOTSUPP;
2689
2690         return doit(skb, nlh);
2691 }
2692
2693 static void rtnetlink_rcv(struct sk_buff *skb)
2694 {
2695         rtnl_lock();
2696         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2697         rtnl_unlock();
2698 }
2699
2700 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2701 {
2702         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2703
2704         switch (event) {
2705         case NETDEV_UP:
2706         case NETDEV_DOWN:
2707         case NETDEV_PRE_UP:
2708         case NETDEV_POST_INIT:
2709         case NETDEV_REGISTER:
2710         case NETDEV_CHANGE:
2711         case NETDEV_PRE_TYPE_CHANGE:
2712         case NETDEV_GOING_DOWN:
2713         case NETDEV_UNREGISTER:
2714         case NETDEV_UNREGISTER_FINAL:
2715         case NETDEV_RELEASE:
2716         case NETDEV_JOIN:
2717                 break;
2718         default:
2719                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2720                 break;
2721         }
2722         return NOTIFY_DONE;
2723 }
2724
2725 static struct notifier_block rtnetlink_dev_notifier = {
2726         .notifier_call  = rtnetlink_event,
2727 };
2728
2729
2730 static int __net_init rtnetlink_net_init(struct net *net)
2731 {
2732         struct sock *sk;
2733         struct netlink_kernel_cfg cfg = {
2734                 .groups         = RTNLGRP_MAX,
2735                 .input          = rtnetlink_rcv,
2736                 .cb_mutex       = &rtnl_mutex,
2737                 .flags          = NL_CFG_F_NONROOT_RECV,
2738         };
2739
2740         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
2741         if (!sk)
2742                 return -ENOMEM;
2743         net->rtnl = sk;
2744         return 0;
2745 }
2746
2747 static void __net_exit rtnetlink_net_exit(struct net *net)
2748 {
2749         netlink_kernel_release(net->rtnl);
2750         net->rtnl = NULL;
2751 }
2752
2753 static struct pernet_operations rtnetlink_net_ops = {
2754         .init = rtnetlink_net_init,
2755         .exit = rtnetlink_net_exit,
2756 };
2757
2758 void __init rtnetlink_init(void)
2759 {
2760         if (register_pernet_subsys(&rtnetlink_net_ops))
2761                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2762
2763         register_netdevice_notifier(&rtnetlink_dev_notifier);
2764
2765         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2766                       rtnl_dump_ifinfo, rtnl_calcit);
2767         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2768         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2769         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2770
2771         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2772         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2773
2774         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
2775         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
2776         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
2777
2778         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
2779         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
2780         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
2781 }
2782