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 }
 772
 773 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 774 {
 775         struct nlattr *vf_ports;
 776         struct nlattr *vf_port;
 777         int vf;
 778         int err;
 779
 780         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 781         if (!vf_ports)
 782                 return -EMSGSIZE;
 783
 784         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 785                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 786                 if (!vf_port)
 787                         goto nla_put_failure;
 788                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 789                         goto nla_put_failure;
 790                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 791                 if (err == -EMSGSIZE)
 792                         goto nla_put_failure;
 793                 if (err) {
 794                         nla_nest_cancel(skb, vf_port);
 795                         continue;
 796                 }
 797                 nla_nest_end(skb, vf_port);
 798         }
 799
 800         nla_nest_end(skb, vf_ports);
 801
 802         return 0;
 803
 804 nla_put_failure:
 805         nla_nest_cancel(skb, vf_ports);
 806         return -EMSGSIZE;
 807 }
 808
 809 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 810 {
 811         struct nlattr *port_self;
 812         int err;
 813
 814         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 815         if (!port_self)
 816                 return -EMSGSIZE;
 817
 818         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 819         if (err) {
 820                 nla_nest_cancel(skb, port_self);
 821                 return (err == -EMSGSIZE) ? err : 0;
 822         }
 823
 824         nla_nest_end(skb, port_self);
 825
 826         return 0;
 827 }
 828
 829 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
 830 {
 831         int err;
 832
 833         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 834                 return 0;
 835
 836         err = rtnl_port_self_fill(skb, dev);
 837         if (err)
 838                 return err;
 839
 840         if (dev_num_vf(dev->dev.parent)) {
 841                 err = rtnl_vf_ports_fill(skb, dev);
 842                 if (err)
 843                         return err;
 844         }
 845
 846         return 0;
 847 }
 848
 849 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 850                             int type, u32 pid, u32 seq, u32 change,
 851                             unsigned int flags, u32 ext_filter_mask)
 852 {
 853         struct ifinfomsg *ifm;
 854         struct nlmsghdr *nlh;
 855         struct rtnl_link_stats64 temp;
 856         const struct rtnl_link_stats64 *stats;
 857         struct nlattr *attr, *af_spec;
 858         struct rtnl_af_ops *af_ops;
 859         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
 860
 861         ASSERT_RTNL();
 862         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 863         if (nlh == NULL)
 864                 return -EMSGSIZE;
 865
 866         ifm = nlmsg_data(nlh);
 867         ifm->ifi_family = AF_UNSPEC;
 868         ifm->__ifi_pad = 0;
 869         ifm->ifi_type = dev->type;
 870         ifm->ifi_index = dev->ifindex;
 871         ifm->ifi_flags = dev_get_flags(dev);
 872         ifm->ifi_change = change;
 873
 874         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
 875             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
 876             nla_put_u8(skb, IFLA_OPERSTATE,
 877                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
 878             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
 879             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
 880             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
 881             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
 882             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
 883 #ifdef CONFIG_RPS
 884             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
 885 #endif
 886             (dev->ifindex != dev->iflink &&
 887              nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
 888             (upper_dev &&
 889              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
 890             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
 891             (dev->qdisc &&
 892              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
 893             (dev->ifalias &&
 894              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)))
 895                 goto nla_put_failure;
 896
 897         if (1) {
 898                 struct rtnl_link_ifmap map = {
 899                         .mem_start   = dev->mem_start,
 900                         .mem_end     = dev->mem_end,
 901                         .base_addr   = dev->base_addr,
 902                         .irq         = dev->irq,
 903                         .dma         = dev->dma,
 904                         .port        = dev->if_port,
 905                 };
 906                 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
 907                         goto nla_put_failure;
 908         }
 909
 910         if (dev->addr_len) {
 911                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
 912                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
 913                         goto nla_put_failure;
 914         }
 915
 916         attr = nla_reserve(skb, IFLA_STATS,
 917                         sizeof(struct rtnl_link_stats));
 918         if (attr == NULL)
 919                 goto nla_put_failure;
 920
 921         stats = dev_get_stats(dev, &temp);
 922         copy_rtnl_link_stats(nla_data(attr), stats);
 923
 924         attr = nla_reserve(skb, IFLA_STATS64,
 925                         sizeof(struct rtnl_link_stats64));
 926         if (attr == NULL)
 927                 goto nla_put_failure;
 928         copy_rtnl_link_stats64(nla_data(attr), stats);
 929
 930         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
 931             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
 932                 goto nla_put_failure;
 933
 934         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
 935             && (ext_filter_mask & RTEXT_FILTER_VF)) {
 936                 int i;
 937
 938                 struct nlattr *vfinfo, *vf;
 939                 int num_vfs = dev_num_vf(dev->dev.parent);
 940
 941                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
 942                 if (!vfinfo)
 943                         goto nla_put_failure;
 944                 for (i = 0; i < num_vfs; i++) {
 945                         struct ifla_vf_info ivi;
 946                         struct ifla_vf_mac vf_mac;
 947                         struct ifla_vf_vlan vf_vlan;
 948                         struct ifla_vf_tx_rate vf_tx_rate;
 949                         struct ifla_vf_spoofchk vf_spoofchk;
 950                         struct ifla_vf_link_state vf_linkstate;
 951
 952                         /*
 953                          * Not all SR-IOV capable drivers support the
 954                          * spoofcheck query.  Preset to -1 so the user
 955                          * space tool can detect that the driver didn't
 956                          * report anything.
 957                          */
 958                         ivi.spoofchk = -1;
 959                         memset(ivi.mac, 0, sizeof(ivi.mac));
 960                         /* The default value for VF link state is "auto"
 961                          * IFLA_VF_LINK_STATE_AUTO which equals zero
 962                          */
 963                         ivi.linkstate = 0;
 964                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
 965                                 break;
 966                         vf_mac.vf =
 967                                 vf_vlan.vf =
 968                                 vf_tx_rate.vf =
 969                                 vf_spoofchk.vf =
 970                                 vf_linkstate.vf = ivi.vf;
 971
 972                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
 973                         vf_vlan.vlan = ivi.vlan;
 974                         vf_vlan.qos = ivi.qos;
 975                         vf_tx_rate.rate = ivi.tx_rate;
 976                         vf_spoofchk.setting = ivi.spoofchk;
 977                         vf_linkstate.link_state = ivi.linkstate;
 978                         vf = nla_nest_start(skb, IFLA_VF_INFO);
 979                         if (!vf) {
 980                                 nla_nest_cancel(skb, vfinfo);
 981                                 goto nla_put_failure;
 982                         }
 983                         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
 984                             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
 985                             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
 986                                     &vf_tx_rate) ||
 987                             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
 988                                     &vf_spoofchk) ||
 989                             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
 990                                     &vf_linkstate))
 991                                 goto nla_put_failure;
 992                         nla_nest_end(skb, vf);
 993                 }
 994                 nla_nest_end(skb, vfinfo);
 995         }
 996
 997         if (rtnl_port_fill(skb, dev))
 998                 goto nla_put_failure;
 999
1000         if (dev->rtnl_link_ops) {
1001                 if (rtnl_link_fill(skb, dev) < 0)
1002                         goto nla_put_failure;
1003         }
1004
1005         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1006                 goto nla_put_failure;
1007
1008         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1009                 if (af_ops->fill_link_af) {
1010                         struct nlattr *af;
1011                         int err;
1012
1013                         if (!(af = nla_nest_start(skb, af_ops->family)))
1014                                 goto nla_put_failure;
1015
1016                         err = af_ops->fill_link_af(skb, dev);
1017
1018                         /*
1019                          * Caller may return ENODATA to indicate that there
1020                          * was no data to be dumped. This is not an error, it
1021                          * means we should trim the attribute header and
1022                          * continue.
1023                          */
1024                         if (err == -ENODATA)
1025                                 nla_nest_cancel(skb, af);
1026                         else if (err < 0)
1027                                 goto nla_put_failure;
1028
1029                         nla_nest_end(skb, af);
1030                 }
1031         }
1032
1033         nla_nest_end(skb, af_spec);
1034
1035         return nlmsg_end(skb, nlh);
1036
1037 nla_put_failure:
1038         nlmsg_cancel(skb, nlh);
1039         return -EMSGSIZE;
1040 }
1041
1042 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1043 {
1044         struct net *net = sock_net(skb->sk);
1045         int h, s_h;
1046         int idx = 0, s_idx;
1047         struct net_device *dev;
1048         struct hlist_head *head;
1049         struct nlattr *tb[IFLA_MAX+1];
1050         u32 ext_filter_mask = 0;
1051
1052         s_h = cb->args[0];
1053         s_idx = cb->args[1];
1054
1055         rcu_read_lock();
1056         cb->seq = net->dev_base_seq;
1057
1058         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1059                         ifla_policy) >= 0) {
1060
1061                 if (tb[IFLA_EXT_MASK])
1062                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1063         }
1064
1065         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1066                 idx = 0;
1067                 head = &net->dev_index_head[h];
1068                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1069                         if (idx < s_idx)
1070                                 goto cont;
1071                         if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1072                                              NETLINK_CB(cb->skb).portid,
1073                                              cb->nlh->nlmsg_seq, 0,
1074                                              NLM_F_MULTI,
1075                                              ext_filter_mask) <= 0)
1076                                 goto out;
1077
1078                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1079 cont:
1080                         idx++;
1081                 }
1082         }
1083 out:
1084         rcu_read_unlock();
1085         cb->args[1] = idx;
1086         cb->args[0] = h;
1087
1088         return skb->len;
1089 }
1090
1091 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1092         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1093         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1094         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1095         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1096         [IFLA_MTU]              = { .type = NLA_U32 },
1097         [IFLA_LINK]             = { .type = NLA_U32 },
1098         [IFLA_MASTER]           = { .type = NLA_U32 },
1099         [IFLA_CARRIER]          = { .type = NLA_U8 },
1100         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1101         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1102         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1103         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1104         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1105         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1106         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1107         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1108         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1109         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1110         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1111         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1112         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1113         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1114         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1115         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1116 };
1117 EXPORT_SYMBOL(ifla_policy);
1118
1119 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1120         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1121         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1122 };
1123
1124 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1125         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1126 };
1127
1128 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1129         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1130                                     .len = sizeof(struct ifla_vf_mac) },
1131         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1132                                     .len = sizeof(struct ifla_vf_vlan) },
1133         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1134                                     .len = sizeof(struct ifla_vf_tx_rate) },
1135         [IFLA_VF_SPOOFCHK]      = { .type = NLA_BINARY,
1136                                     .len = sizeof(struct ifla_vf_spoofchk) },
1137 };
1138
1139 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1140         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1141         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1142                                     .len = PORT_PROFILE_MAX },
1143         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1144                                     .len = sizeof(struct ifla_port_vsi)},
1145         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1146                                       .len = PORT_UUID_MAX },
1147         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1148                                     .len = PORT_UUID_MAX },
1149         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1150         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1151 };
1152
1153 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1154 {
1155         struct net *net;
1156         /* Examine the link attributes and figure out which
1157          * network namespace we are talking about.
1158          */
1159         if (tb[IFLA_NET_NS_PID])
1160                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1161         else if (tb[IFLA_NET_NS_FD])
1162                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1163         else
1164                 net = get_net(src_net);
1165         return net;
1166 }
1167 EXPORT_SYMBOL(rtnl_link_get_net);
1168
1169 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1170 {
1171         if (dev) {
1172                 if (tb[IFLA_ADDRESS] &&
1173                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1174                         return -EINVAL;
1175
1176                 if (tb[IFLA_BROADCAST] &&
1177                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1178                         return -EINVAL;
1179         }
1180
1181         if (tb[IFLA_AF_SPEC]) {
1182                 struct nlattr *af;
1183                 int rem, err;
1184
1185                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1186                         const struct rtnl_af_ops *af_ops;
1187
1188                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1189                                 return -EAFNOSUPPORT;
1190
1191                         if (!af_ops->set_link_af)
1192                                 return -EOPNOTSUPP;
1193
1194                         if (af_ops->validate_link_af) {
1195                                 err = af_ops->validate_link_af(dev, af);
1196                                 if (err < 0)
1197                                         return err;
1198                         }
1199                 }
1200         }
1201
1202         return 0;
1203 }
1204
1205 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1206 {
1207         int rem, err = -EINVAL;
1208         struct nlattr *vf;
1209         const struct net_device_ops *ops = dev->netdev_ops;
1210
1211         nla_for_each_nested(vf, attr, rem) {
1212                 switch (nla_type(vf)) {
1213                 case IFLA_VF_MAC: {
1214                         struct ifla_vf_mac *ivm;
1215                         ivm = nla_data(vf);
1216                         err = -EOPNOTSUPP;
1217                         if (ops->ndo_set_vf_mac)
1218                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1219                                                           ivm->mac);
1220                         break;
1221                 }
1222                 case IFLA_VF_VLAN: {
1223                         struct ifla_vf_vlan *ivv;
1224                         ivv = nla_data(vf);
1225                         err = -EOPNOTSUPP;
1226                         if (ops->ndo_set_vf_vlan)
1227                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1228                                                            ivv->vlan,
1229                                                            ivv->qos);
1230                         break;
1231                 }
1232                 case IFLA_VF_TX_RATE: {
1233                         struct ifla_vf_tx_rate *ivt;
1234                         ivt = nla_data(vf);
1235                         err = -EOPNOTSUPP;
1236                         if (ops->ndo_set_vf_tx_rate)
1237                                 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1238                                                               ivt->rate);
1239                         break;
1240                 }
1241                 case IFLA_VF_SPOOFCHK: {
1242                         struct ifla_vf_spoofchk *ivs;
1243                         ivs = nla_data(vf);
1244                         err = -EOPNOTSUPP;
1245                         if (ops->ndo_set_vf_spoofchk)
1246                                 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1247                                                                ivs->setting);
1248                         break;
1249                 }
1250                 case IFLA_VF_LINK_STATE: {
1251                         struct ifla_vf_link_state *ivl;
1252                         ivl = nla_data(vf);
1253                         err = -EOPNOTSUPP;
1254                         if (ops->ndo_set_vf_link_state)
1255                                 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1256                                                                  ivl->link_state);
1257                         break;
1258                 }
1259                 default:
1260                         err = -EINVAL;
1261                         break;
1262                 }
1263                 if (err)
1264                         break;
1265         }
1266         return err;
1267 }
1268
1269 static int do_set_master(struct net_device *dev, int ifindex)
1270 {
1271         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1272         const struct net_device_ops *ops;
1273         int err;
1274
1275         if (upper_dev) {
1276                 if (upper_dev->ifindex == ifindex)
1277                         return 0;
1278                 ops = upper_dev->netdev_ops;
1279                 if (ops->ndo_del_slave) {
1280                         err = ops->ndo_del_slave(upper_dev, dev);
1281                         if (err)
1282                                 return err;
1283                 } else {
1284                         return -EOPNOTSUPP;
1285                 }
1286         }
1287
1288         if (ifindex) {
1289                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1290                 if (!upper_dev)
1291                         return -EINVAL;
1292                 ops = upper_dev->netdev_ops;
1293                 if (ops->ndo_add_slave) {
1294                         err = ops->ndo_add_slave(upper_dev, dev);
1295                         if (err)
1296                                 return err;
1297                 } else {
1298                         return -EOPNOTSUPP;
1299                 }
1300         }
1301         return 0;
1302 }
1303
1304 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1305                       struct nlattr **tb, char *ifname, int modified)
1306 {
1307         const struct net_device_ops *ops = dev->netdev_ops;
1308         int err;
1309
1310         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1311                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1312                 if (IS_ERR(net)) {
1313                         err = PTR_ERR(net);
1314                         goto errout;
1315                 }
1316                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1317                         err = -EPERM;
1318                         goto errout;
1319                 }
1320                 err = dev_change_net_namespace(dev, net, ifname);
1321                 put_net(net);
1322                 if (err)
1323                         goto errout;
1324                 modified = 1;
1325         }
1326
1327         if (tb[IFLA_MAP]) {
1328                 struct rtnl_link_ifmap *u_map;
1329                 struct ifmap k_map;
1330
1331                 if (!ops->ndo_set_config) {
1332                         err = -EOPNOTSUPP;
1333                         goto errout;
1334                 }
1335
1336                 if (!netif_device_present(dev)) {
1337                         err = -ENODEV;
1338                         goto errout;
1339                 }
1340
1341                 u_map = nla_data(tb[IFLA_MAP]);
1342                 k_map.mem_start = (unsigned long) u_map->mem_start;
1343                 k_map.mem_end = (unsigned long) u_map->mem_end;
1344                 k_map.base_addr = (unsigned short) u_map->base_addr;
1345                 k_map.irq = (unsigned char) u_map->irq;
1346                 k_map.dma = (unsigned char) u_map->dma;
1347                 k_map.port = (unsigned char) u_map->port;
1348
1349                 err = ops->ndo_set_config(dev, &k_map);
1350                 if (err < 0)
1351                         goto errout;
1352
1353                 modified = 1;
1354         }
1355
1356         if (tb[IFLA_ADDRESS]) {
1357                 struct sockaddr *sa;
1358                 int len;
1359
1360                 len = sizeof(sa_family_t) + dev->addr_len;
1361                 sa = kmalloc(len, GFP_KERNEL);
1362                 if (!sa) {
1363                         err = -ENOMEM;
1364                         goto errout;
1365                 }
1366                 sa->sa_family = dev->type;
1367                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1368                        dev->addr_len);
1369                 err = dev_set_mac_address(dev, sa);
1370                 kfree(sa);
1371                 if (err)
1372                         goto errout;
1373                 modified = 1;
1374         }
1375
1376         if (tb[IFLA_MTU]) {
1377                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1378                 if (err < 0)
1379                         goto errout;
1380                 modified = 1;
1381         }
1382
1383         if (tb[IFLA_GROUP]) {
1384                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1385                 modified = 1;
1386         }
1387
1388         /*
1389          * Interface selected by interface index but interface
1390          * name provided implies that a name change has been
1391          * requested.
1392          */
1393         if (ifm->ifi_index > 0 && ifname[0]) {
1394                 err = dev_change_name(dev, ifname);
1395                 if (err < 0)
1396                         goto errout;
1397                 modified = 1;
1398         }
1399
1400         if (tb[IFLA_IFALIAS]) {
1401                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1402                                     nla_len(tb[IFLA_IFALIAS]));
1403                 if (err < 0)
1404                         goto errout;
1405                 modified = 1;
1406         }
1407
1408         if (tb[IFLA_BROADCAST]) {
1409                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1410                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1411         }
1412
1413         if (ifm->ifi_flags || ifm->ifi_change) {
1414                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1415                 if (err < 0)
1416                         goto errout;
1417         }
1418
1419         if (tb[IFLA_MASTER]) {
1420                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1421                 if (err)
1422                         goto errout;
1423                 modified = 1;
1424         }
1425
1426         if (tb[IFLA_CARRIER]) {
1427                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1428                 if (err)
1429                         goto errout;
1430                 modified = 1;
1431         }
1432
1433         if (tb[IFLA_TXQLEN])
1434                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1435
1436         if (tb[IFLA_OPERSTATE])
1437                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1438
1439         if (tb[IFLA_LINKMODE]) {
1440                 write_lock_bh(&dev_base_lock);
1441                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1442                 write_unlock_bh(&dev_base_lock);
1443         }
1444
1445         if (tb[IFLA_VFINFO_LIST]) {
1446                 struct nlattr *attr;
1447                 int rem;
1448                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1449                         if (nla_type(attr) != IFLA_VF_INFO) {
1450                                 err = -EINVAL;
1451                                 goto errout;
1452                         }
1453                         err = do_setvfinfo(dev, attr);
1454                         if (err < 0)
1455                                 goto errout;
1456                         modified = 1;
1457                 }
1458         }
1459         err = 0;
1460
1461         if (tb[IFLA_VF_PORTS]) {
1462                 struct nlattr *port[IFLA_PORT_MAX+1];
1463                 struct nlattr *attr;
1464                 int vf;
1465                 int rem;
1466
1467                 err = -EOPNOTSUPP;
1468                 if (!ops->ndo_set_vf_port)
1469                         goto errout;
1470
1471                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1472                         if (nla_type(attr) != IFLA_VF_PORT)
1473                                 continue;
1474                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1475                                 attr, ifla_port_policy);
1476                         if (err < 0)
1477                                 goto errout;
1478                         if (!port[IFLA_PORT_VF]) {
1479                                 err = -EOPNOTSUPP;
1480                                 goto errout;
1481                         }
1482                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1483                         err = ops->ndo_set_vf_port(dev, vf, port);
1484                         if (err < 0)
1485                                 goto errout;
1486                         modified = 1;
1487                 }
1488         }
1489         err = 0;
1490
1491         if (tb[IFLA_PORT_SELF]) {
1492                 struct nlattr *port[IFLA_PORT_MAX+1];
1493
1494                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1495                         tb[IFLA_PORT_SELF], ifla_port_policy);
1496                 if (err < 0)
1497                         goto errout;
1498
1499                 err = -EOPNOTSUPP;
1500                 if (ops->ndo_set_vf_port)
1501                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1502                 if (err < 0)
1503                         goto errout;
1504                 modified = 1;
1505         }
1506
1507         if (tb[IFLA_AF_SPEC]) {
1508                 struct nlattr *af;
1509                 int rem;
1510
1511                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1512                         const struct rtnl_af_ops *af_ops;
1513
1514                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1515                                 BUG();
1516
1517                         err = af_ops->set_link_af(dev, af);
1518                         if (err < 0)
1519                                 goto errout;
1520
1521                         modified = 1;
1522                 }
1523         }
1524         err = 0;
1525
1526 errout:
1527         if (err < 0 && modified)
1528                 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",
1529                                      dev->name);
1530
1531         return err;
1532 }
1533
1534 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1535 {
1536         struct net *net = sock_net(skb->sk);
1537         struct ifinfomsg *ifm;
1538         struct net_device *dev;
1539         int err;
1540         struct nlattr *tb[IFLA_MAX+1];
1541         char ifname[IFNAMSIZ];
1542
1543         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1544         if (err < 0)
1545                 goto errout;
1546
1547         if (tb[IFLA_IFNAME])
1548                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1549         else
1550                 ifname[0] = '\0';
1551
1552         err = -EINVAL;
1553         ifm = nlmsg_data(nlh);
1554         if (ifm->ifi_index > 0)
1555                 dev = __dev_get_by_index(net, ifm->ifi_index);
1556         else if (tb[IFLA_IFNAME])
1557                 dev = __dev_get_by_name(net, ifname);
1558         else
1559                 goto errout;
1560
1561         if (dev == NULL) {
1562                 err = -ENODEV;
1563                 goto errout;
1564         }
1565
1566         err = validate_linkmsg(dev, tb);
1567         if (err < 0)
1568                 goto errout;
1569
1570         err = do_setlink(dev, ifm, tb, ifname, 0);
1571 errout:
1572         return err;
1573 }
1574
1575 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1576 {
1577         struct net *net = sock_net(skb->sk);
1578         const struct rtnl_link_ops *ops;
1579         struct net_device *dev;
1580         struct ifinfomsg *ifm;
1581         char ifname[IFNAMSIZ];
1582         struct nlattr *tb[IFLA_MAX+1];
1583         int err;
1584         LIST_HEAD(list_kill);
1585
1586         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1587         if (err < 0)
1588                 return err;
1589
1590         if (tb[IFLA_IFNAME])
1591                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1592
1593         ifm = nlmsg_data(nlh);
1594         if (ifm->ifi_index > 0)
1595                 dev = __dev_get_by_index(net, ifm->ifi_index);
1596         else if (tb[IFLA_IFNAME])
1597                 dev = __dev_get_by_name(net, ifname);
1598         else
1599                 return -EINVAL;
1600
1601         if (!dev)
1602                 return -ENODEV;
1603
1604         ops = dev->rtnl_link_ops;
1605         if (!ops)
1606                 return -EOPNOTSUPP;
1607
1608         ops->dellink(dev, &list_kill);
1609         unregister_netdevice_many(&list_kill);
1610         list_del(&list_kill);
1611         return 0;
1612 }
1613
1614 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1615 {
1616         unsigned int old_flags;
1617         int err;
1618
1619         old_flags = dev->flags;
1620         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1621                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1622                 if (err < 0)
1623                         return err;
1624         }
1625
1626         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1627         rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1628
1629         __dev_notify_flags(dev, old_flags);
1630         return 0;
1631 }
1632 EXPORT_SYMBOL(rtnl_configure_link);
1633
1634 struct net_device *rtnl_create_link(struct net *net,
1635         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1636 {
1637         int err;
1638         struct net_device *dev;
1639         unsigned int num_tx_queues = 1;
1640         unsigned int num_rx_queues = 1;
1641
1642         if (tb[IFLA_NUM_TX_QUEUES])
1643                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1644         else if (ops->get_num_tx_queues)
1645                 num_tx_queues = ops->get_num_tx_queues();
1646
1647         if (tb[IFLA_NUM_RX_QUEUES])
1648                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1649         else if (ops->get_num_rx_queues)
1650                 num_rx_queues = ops->get_num_rx_queues();
1651
1652         err = -ENOMEM;
1653         dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup,
1654                                num_tx_queues, num_rx_queues);
1655         if (!dev)
1656                 goto err;
1657
1658         dev_net_set(dev, net);
1659         dev->rtnl_link_ops = ops;
1660         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1661
1662         if (tb[IFLA_MTU])
1663                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1664         if (tb[IFLA_ADDRESS]) {
1665                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1666                                 nla_len(tb[IFLA_ADDRESS]));
1667                 dev->addr_assign_type = NET_ADDR_SET;
1668         }
1669         if (tb[IFLA_BROADCAST])
1670                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1671                                 nla_len(tb[IFLA_BROADCAST]));
1672         if (tb[IFLA_TXQLEN])
1673                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1674         if (tb[IFLA_OPERSTATE])
1675                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1676         if (tb[IFLA_LINKMODE])
1677                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1678         if (tb[IFLA_GROUP])
1679                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1680
1681         return dev;
1682
1683 err:
1684         return ERR_PTR(err);
1685 }
1686 EXPORT_SYMBOL(rtnl_create_link);
1687
1688 static int rtnl_group_changelink(struct net *net, int group,
1689                 struct ifinfomsg *ifm,
1690                 struct nlattr **tb)
1691 {
1692         struct net_device *dev;
1693         int err;
1694
1695         for_each_netdev(net, dev) {
1696                 if (dev->group == group) {
1697                         err = do_setlink(dev, ifm, tb, NULL, 0);
1698                         if (err < 0)
1699                                 return err;
1700                 }
1701         }
1702
1703         return 0;
1704 }
1705
1706 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1707 {
1708         struct net *net = sock_net(skb->sk);
1709         const struct rtnl_link_ops *ops;
1710         struct net_device *dev;
1711         struct ifinfomsg *ifm;
1712         char kind[MODULE_NAME_LEN];
1713         char ifname[IFNAMSIZ];
1714         struct nlattr *tb[IFLA_MAX+1];
1715         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1716         int err;
1717
1718 #ifdef CONFIG_MODULES
1719 replay:
1720 #endif
1721         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1722         if (err < 0)
1723                 return err;
1724
1725         if (tb[IFLA_IFNAME])
1726                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1727         else
1728                 ifname[0] = '\0';
1729
1730         ifm = nlmsg_data(nlh);
1731         if (ifm->ifi_index > 0)
1732                 dev = __dev_get_by_index(net, ifm->ifi_index);
1733         else {
1734                 if (ifname[0])
1735                         dev = __dev_get_by_name(net, ifname);
1736                 else
1737                         dev = NULL;
1738         }
1739
1740         err = validate_linkmsg(dev, tb);
1741         if (err < 0)
1742                 return err;
1743
1744         if (tb[IFLA_LINKINFO]) {
1745                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1746                                        tb[IFLA_LINKINFO], ifla_info_policy);
1747                 if (err < 0)
1748                         return err;
1749         } else
1750                 memset(linkinfo, 0, sizeof(linkinfo));
1751
1752         if (linkinfo[IFLA_INFO_KIND]) {
1753                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1754                 ops = rtnl_link_ops_get(kind);
1755         } else {
1756                 kind[0] = '\0';
1757                 ops = NULL;
1758         }
1759
1760         if (1) {
1761                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1762                 struct net *dest_net;
1763
1764                 if (ops) {
1765                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1766                                 err = nla_parse_nested(attr, ops->maxtype,
1767                                                        linkinfo[IFLA_INFO_DATA],
1768                                                        ops->policy);
1769                                 if (err < 0)
1770                                         return err;
1771                                 data = attr;
1772                         }
1773                         if (ops->validate) {
1774                                 err = ops->validate(tb, data);
1775                                 if (err < 0)
1776                                         return err;
1777                         }
1778                 }
1779
1780                 if (dev) {
1781                         int modified = 0;
1782
1783                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1784                                 return -EEXIST;
1785                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1786                                 return -EOPNOTSUPP;
1787
1788                         if (linkinfo[IFLA_INFO_DATA]) {
1789                                 if (!ops || ops != dev->rtnl_link_ops ||
1790                                     !ops->changelink)
1791                                         return -EOPNOTSUPP;
1792
1793                                 err = ops->changelink(dev, tb, data);
1794                                 if (err < 0)
1795                                         return err;
1796                                 modified = 1;
1797                         }
1798
1799                         return do_setlink(dev, ifm, tb, ifname, modified);
1800                 }
1801
1802                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1803                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1804                                 return rtnl_group_changelink(net,
1805                                                 nla_get_u32(tb[IFLA_GROUP]),
1806                                                 ifm, tb);
1807                         return -ENODEV;
1808                 }
1809
1810                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1811                         return -EOPNOTSUPP;
1812
1813                 if (!ops) {
1814 #ifdef CONFIG_MODULES
1815                         if (kind[0]) {
1816                                 __rtnl_unlock();
1817                                 request_module("rtnl-link-%s", kind);
1818                                 rtnl_lock();
1819                                 ops = rtnl_link_ops_get(kind);
1820                                 if (ops)
1821                                         goto replay;
1822                         }
1823 #endif
1824                         return -EOPNOTSUPP;
1825                 }
1826
1827                 if (!ifname[0])
1828                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1829
1830                 dest_net = rtnl_link_get_net(net, tb);
1831                 if (IS_ERR(dest_net))
1832                         return PTR_ERR(dest_net);
1833
1834                 dev = rtnl_create_link(dest_net, ifname, ops, tb);
1835                 if (IS_ERR(dev)) {
1836                         err = PTR_ERR(dev);
1837                         goto out;
1838                 }
1839
1840                 dev->ifindex = ifm->ifi_index;
1841
1842                 if (ops->newlink)
1843                         err = ops->newlink(net, dev, tb, data);
1844                 else
1845                         err = register_netdevice(dev);
1846
1847                 if (err < 0 && !IS_ERR(dev))
1848                         free_netdev(dev);
1849                 if (err < 0)
1850                         goto out;
1851
1852                 err = rtnl_configure_link(dev, ifm);
1853                 if (err < 0)
1854                         unregister_netdevice(dev);
1855 out:
1856                 put_net(dest_net);
1857                 return err;
1858         }
1859 }
1860
1861 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
1862 {
1863         struct net *net = sock_net(skb->sk);
1864         struct ifinfomsg *ifm;
1865         char ifname[IFNAMSIZ];
1866         struct nlattr *tb[IFLA_MAX+1];
1867         struct net_device *dev = NULL;
1868         struct sk_buff *nskb;
1869         int err;
1870         u32 ext_filter_mask = 0;
1871
1872         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1873         if (err < 0)
1874                 return err;
1875
1876         if (tb[IFLA_IFNAME])
1877                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1878
1879         if (tb[IFLA_EXT_MASK])
1880                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1881
1882         ifm = nlmsg_data(nlh);
1883         if (ifm->ifi_index > 0)
1884                 dev = __dev_get_by_index(net, ifm->ifi_index);
1885         else if (tb[IFLA_IFNAME])
1886                 dev = __dev_get_by_name(net, ifname);
1887         else
1888                 return -EINVAL;
1889
1890         if (dev == NULL)
1891                 return -ENODEV;
1892
1893         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1894         if (nskb == NULL)
1895                 return -ENOBUFS;
1896
1897         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
1898                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1899         if (err < 0) {
1900                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1901                 WARN_ON(err == -EMSGSIZE);
1902                 kfree_skb(nskb);
1903         } else
1904                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
1905
1906         return err;
1907 }
1908
1909 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1910 {
1911         struct net *net = sock_net(skb->sk);
1912         struct net_device *dev;
1913         struct nlattr *tb[IFLA_MAX+1];
1914         u32 ext_filter_mask = 0;
1915         u16 min_ifinfo_dump_size = 0;
1916
1917         if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1918                         ifla_policy) >= 0) {
1919                 if (tb[IFLA_EXT_MASK])
1920                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1921         }
1922
1923         if (!ext_filter_mask)
1924                 return NLMSG_GOODSIZE;
1925         /*
1926          * traverse the list of net devices and compute the minimum
1927          * buffer size based upon the filter mask.
1928          */
1929         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1930                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1931                                              if_nlmsg_size(dev,
1932                                                            ext_filter_mask));
1933         }
1934
1935         return min_ifinfo_dump_size;
1936 }
1937
1938 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1939 {
1940         int idx;
1941         int s_idx = cb->family;
1942
1943         if (s_idx == 0)
1944                 s_idx = 1;
1945         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1946                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1947                 if (idx < s_idx || idx == PF_PACKET)
1948                         continue;
1949                 if (rtnl_msg_handlers[idx] == NULL ||
1950                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1951                         continue;
1952                 if (idx > s_idx) {
1953                         memset(&cb->args[0], 0, sizeof(cb->args));
1954                         cb->prev_seq = 0;
1955                         cb->seq = 0;
1956                 }
1957                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1958                         break;
1959         }
1960         cb->family = idx;
1961
1962         return skb->len;
1963 }
1964
1965 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change)
1966 {
1967         struct net *net = dev_net(dev);
1968         struct sk_buff *skb;
1969         int err = -ENOBUFS;
1970         size_t if_info_size;
1971
1972         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1973         if (skb == NULL)
1974                 goto errout;
1975
1976         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1977         if (err < 0) {
1978                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1979                 WARN_ON(err == -EMSGSIZE);
1980                 kfree_skb(skb);
1981                 goto errout;
1982         }
1983         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1984         return;
1985 errout:
1986         if (err < 0)
1987                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1988 }
1989 EXPORT_SYMBOL(rtmsg_ifinfo);
1990
1991 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
1992                                    struct net_device *dev,
1993                                    u8 *addr, u32 pid, u32 seq,
1994                                    int type, unsigned int flags)
1995 {
1996         struct nlmsghdr *nlh;
1997         struct ndmsg *ndm;
1998
1999         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI);
2000         if (!nlh)
2001                 return -EMSGSIZE;
2002
2003         ndm = nlmsg_data(nlh);
2004         ndm->ndm_family  = AF_BRIDGE;
2005         ndm->ndm_pad1    = 0;
2006         ndm->ndm_pad2    = 0;
2007         ndm->ndm_flags   = flags;
2008         ndm->ndm_type    = 0;
2009         ndm->ndm_ifindex = dev->ifindex;
2010         ndm->ndm_state   = NUD_PERMANENT;
2011
2012         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2013                 goto nla_put_failure;
2014
2015         return nlmsg_end(skb, nlh);
2016
2017 nla_put_failure:
2018         nlmsg_cancel(skb, nlh);
2019         return -EMSGSIZE;
2020 }
2021
2022 static inline size_t rtnl_fdb_nlmsg_size(void)
2023 {
2024         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2025 }
2026
2027 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2028 {
2029         struct net *net = dev_net(dev);
2030         struct sk_buff *skb;
2031         int err = -ENOBUFS;
2032
2033         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2034         if (!skb)
2035                 goto errout;
2036
2037         err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF);
2038         if (err < 0) {
2039                 kfree_skb(skb);
2040                 goto errout;
2041         }
2042
2043         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2044         return;
2045 errout:
2046         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2047 }
2048
2049 /**
2050  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2051  */
2052 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2053                      struct nlattr *tb[],
2054                      struct net_device *dev,
2055                      const unsigned char *addr,
2056                      u16 flags)
2057 {
2058         int err = -EINVAL;
2059
2060         /* If aging addresses are supported device will need to
2061          * implement its own handler for this.
2062          */
2063         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2064                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2065                 return err;
2066         }
2067
2068         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2069                 err = dev_uc_add_excl(dev, addr);
2070         else if (is_multicast_ether_addr(addr))
2071                 err = dev_mc_add_excl(dev, addr);
2072
2073         /* Only return duplicate errors if NLM_F_EXCL is set */
2074         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2075                 err = 0;
2076
2077         return err;
2078 }
2079 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2080
2081 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2082 {
2083         struct net *net = sock_net(skb->sk);
2084         struct ndmsg *ndm;
2085         struct nlattr *tb[NDA_MAX+1];
2086         struct net_device *dev;
2087         u8 *addr;
2088         int err;
2089
2090         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2091         if (err < 0)
2092                 return err;
2093
2094         ndm = nlmsg_data(nlh);
2095         if (ndm->ndm_ifindex == 0) {
2096                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2097                 return -EINVAL;
2098         }
2099
2100         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2101         if (dev == NULL) {
2102                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2103                 return -ENODEV;
2104         }
2105
2106         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2107                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2108                 return -EINVAL;
2109         }
2110
2111         addr = nla_data(tb[NDA_LLADDR]);
2112
2113         err = -EOPNOTSUPP;
2114
2115         /* Support fdb on master device the net/bridge default case */
2116         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2117             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2118                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2119                 const struct net_device_ops *ops = br_dev->netdev_ops;
2120
2121                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2122                 if (err)
2123                         goto out;
2124                 else
2125                         ndm->ndm_flags &= ~NTF_MASTER;
2126         }
2127
2128         /* Embedded bridge, macvlan, and any other device support */
2129         if ((ndm->ndm_flags & NTF_SELF)) {
2130                 if (dev->netdev_ops->ndo_fdb_add)
2131                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2132                                                            nlh->nlmsg_flags);
2133                 else
2134                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2135                                                nlh->nlmsg_flags);
2136
2137                 if (!err) {
2138                         rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2139                         ndm->ndm_flags &= ~NTF_SELF;
2140                 }
2141         }
2142 out:
2143         return err;
2144 }
2145
2146 /**
2147  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2148  */
2149 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2150                      struct nlattr *tb[],
2151                      struct net_device *dev,
2152                      const unsigned char *addr)
2153 {
2154         int err = -EOPNOTSUPP;
2155
2156         /* If aging addresses are supported device will need to
2157          * implement its own handler for this.
2158          */
2159         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2160                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2161                 return -EINVAL;
2162         }
2163
2164         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2165                 err = dev_uc_del(dev, addr);
2166         else if (is_multicast_ether_addr(addr))
2167                 err = dev_mc_del(dev, addr);
2168         else
2169                 err = -EINVAL;
2170
2171         return err;
2172 }
2173 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2174
2175 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2176 {
2177         struct net *net = sock_net(skb->sk);
2178         struct ndmsg *ndm;
2179         struct nlattr *tb[NDA_MAX+1];
2180         struct net_device *dev;
2181         int err = -EINVAL;
2182         __u8 *addr;
2183
2184         if (!capable(CAP_NET_ADMIN))
2185                 return -EPERM;
2186
2187         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2188         if (err < 0)
2189                 return err;
2190
2191         ndm = nlmsg_data(nlh);
2192         if (ndm->ndm_ifindex == 0) {
2193                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2194                 return -EINVAL;
2195         }
2196
2197         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2198         if (dev == NULL) {
2199                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2200                 return -ENODEV;
2201         }
2202
2203         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2204                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2205                 return -EINVAL;
2206         }
2207
2208         addr = nla_data(tb[NDA_LLADDR]);
2209
2210         err = -EOPNOTSUPP;
2211
2212         /* Support fdb on master device the net/bridge default case */
2213         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2214             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2215                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2216                 const struct net_device_ops *ops = br_dev->netdev_ops;
2217
2218                 if (ops->ndo_fdb_del)
2219                         err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2220
2221                 if (err)
2222                         goto out;
2223                 else
2224                         ndm->ndm_flags &= ~NTF_MASTER;
2225         }
2226
2227         /* Embedded bridge, macvlan, and any other device support */
2228         if (ndm->ndm_flags & NTF_SELF) {
2229                 if (dev->netdev_ops->ndo_fdb_del)
2230                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2231                 else
2232                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2233
2234                 if (!err) {
2235                         rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2236                         ndm->ndm_flags &= ~NTF_SELF;
2237                 }
2238         }
2239 out:
2240         return err;
2241 }
2242
2243 static int nlmsg_populate_fdb(struct sk_buff *skb,
2244                               struct netlink_callback *cb,
2245                               struct net_device *dev,
2246                               int *idx,
2247                               struct netdev_hw_addr_list *list)
2248 {
2249         struct netdev_hw_addr *ha;
2250         int err;
2251         u32 portid, seq;
2252
2253         portid = NETLINK_CB(cb->skb).portid;
2254         seq = cb->nlh->nlmsg_seq;
2255
2256         list_for_each_entry(ha, &list->list, list) {
2257                 if (*idx < cb->args[0])
2258                         goto skip;
2259
2260                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2261                                               portid, seq,
2262                                               RTM_NEWNEIGH, NTF_SELF);
2263                 if (err < 0)
2264                         return err;
2265 skip:
2266                 *idx += 1;
2267         }
2268         return 0;
2269 }
2270
2271 /**
2272  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2273  * @nlh: netlink message header
2274  * @dev: netdevice
2275  *
2276  * Default netdevice operation to dump the existing unicast address list.
2277  * Returns number of addresses from list put in skb.
2278  */
2279 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2280                       struct netlink_callback *cb,
2281                       struct net_device *dev,
2282                       int idx)
2283 {
2284         int err;
2285
2286         netif_addr_lock_bh(dev);
2287         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2288         if (err)
2289                 goto out;
2290         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2291 out:
2292         netif_addr_unlock_bh(dev);
2293         return idx;
2294 }
2295 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2296
2297 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2298 {
2299         int idx = 0;
2300         struct net *net = sock_net(skb->sk);
2301         struct net_device *dev;
2302
2303         rcu_read_lock();
2304         for_each_netdev_rcu(net, dev) {
2305                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2306                         struct net_device *br_dev;
2307                         const struct net_device_ops *ops;
2308
2309                         br_dev = netdev_master_upper_dev_get(dev);
2310                         ops = br_dev->netdev_ops;
2311                         if (ops->ndo_fdb_dump)
2312                                 idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
2313                 }
2314
2315                 if (dev->netdev_ops->ndo_fdb_dump)
2316                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
2317                 else
2318                         idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
2319         }
2320         rcu_read_unlock();
2321
2322         cb->args[0] = idx;
2323         return skb->len;
2324 }
2325
2326 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2327                             struct net_device *dev, u16 mode)
2328 {
2329         struct nlmsghdr *nlh;
2330         struct ifinfomsg *ifm;
2331         struct nlattr *br_afspec;
2332         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2333         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2334
2335         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2336         if (nlh == NULL)
2337                 return -EMSGSIZE;
2338
2339         ifm = nlmsg_data(nlh);
2340         ifm->ifi_family = AF_BRIDGE;
2341         ifm->__ifi_pad = 0;
2342         ifm->ifi_type = dev->type;
2343         ifm->ifi_index = dev->ifindex;
2344         ifm->ifi_flags = dev_get_flags(dev);
2345         ifm->ifi_change = 0;
2346
2347
2348         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2349             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2350             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2351             (br_dev &&
2352              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2353             (dev->addr_len &&
2354              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2355             (dev->ifindex != dev->iflink &&
2356              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2357                 goto nla_put_failure;
2358
2359         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2360         if (!br_afspec)
2361                 goto nla_put_failure;
2362
2363         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2364             nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2365                 nla_nest_cancel(skb, br_afspec);
2366                 goto nla_put_failure;
2367         }
2368         nla_nest_end(skb, br_afspec);
2369
2370         return nlmsg_end(skb, nlh);
2371 nla_put_failure:
2372         nlmsg_cancel(skb, nlh);
2373         return -EMSGSIZE;
2374 }
2375 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2376
2377 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2378 {
2379         struct net *net = sock_net(skb->sk);
2380         struct net_device *dev;
2381         int idx = 0;
2382         u32 portid = NETLINK_CB(cb->skb).portid;
2383         u32 seq = cb->nlh->nlmsg_seq;
2384         struct nlattr *extfilt;
2385         u32 filter_mask = 0;
2386
2387         extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2388                                   IFLA_EXT_MASK);
2389         if (extfilt)
2390                 filter_mask = nla_get_u32(extfilt);
2391
2392         rcu_read_lock();
2393         for_each_netdev_rcu(net, dev) {
2394                 const struct net_device_ops *ops = dev->netdev_ops;
2395                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2396
2397                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2398                         if (idx >= cb->args[0] &&
2399                             br_dev->netdev_ops->ndo_bridge_getlink(
2400                                     skb, portid, seq, dev, filter_mask) < 0)
2401                                 break;
2402                         idx++;
2403                 }
2404
2405                 if (ops->ndo_bridge_getlink) {
2406                         if (idx >= cb->args[0] &&
2407                             ops->ndo_bridge_getlink(skb, portid, seq, dev,
2408                                                     filter_mask) < 0)
2409                                 break;
2410                         idx++;
2411                 }
2412         }
2413         rcu_read_unlock();
2414         cb->args[0] = idx;
2415
2416         return skb->len;
2417 }
2418
2419 static inline size_t bridge_nlmsg_size(void)
2420 {
2421         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2422                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
2423                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
2424                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
2425                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
2426                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
2427                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
2428                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
2429                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2430                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
2431                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
2432 }
2433
2434 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2435 {
2436         struct net *net = dev_net(dev);
2437         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2438         struct sk_buff *skb;
2439         int err = -EOPNOTSUPP;
2440
2441         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2442         if (!skb) {
2443                 err = -ENOMEM;
2444                 goto errout;
2445         }
2446
2447         if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2448             br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2449                 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2450                 if (err < 0)
2451                         goto errout;
2452         }
2453
2454         if ((flags & BRIDGE_FLAGS_SELF) &&
2455             dev->netdev_ops->ndo_bridge_getlink) {
2456                 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2457                 if (err < 0)
2458                         goto errout;
2459         }
2460
2461         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2462         return 0;
2463 errout:
2464         WARN_ON(err == -EMSGSIZE);
2465         kfree_skb(skb);
2466         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2467         return err;
2468 }
2469
2470 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2471 {
2472         struct net *net = sock_net(skb->sk);
2473         struct ifinfomsg *ifm;
2474         struct net_device *dev;
2475         struct nlattr *br_spec, *attr = NULL;
2476         int rem, err = -EOPNOTSUPP;
2477         u16 oflags, flags = 0;
2478         bool have_flags = false;
2479
2480         if (nlmsg_len(nlh) < sizeof(*ifm))
2481                 return -EINVAL;
2482
2483         ifm = nlmsg_data(nlh);
2484         if (ifm->ifi_family != AF_BRIDGE)
2485                 return -EPFNOSUPPORT;
2486
2487         dev = __dev_get_by_index(net, ifm->ifi_index);
2488         if (!dev) {
2489                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2490                 return -ENODEV;
2491         }
2492
2493         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2494         if (br_spec) {
2495                 nla_for_each_nested(attr, br_spec, rem) {
2496                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2497                                 have_flags = true;
2498                                 flags = nla_get_u16(attr);
2499                                 break;
2500                         }
2501                 }
2502         }
2503
2504         oflags = flags;
2505
2506         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2507                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2508
2509                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2510                         err = -EOPNOTSUPP;
2511                         goto out;
2512                 }
2513
2514                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2515                 if (err)
2516                         goto out;
2517
2518                 flags &= ~BRIDGE_FLAGS_MASTER;
2519         }
2520
2521         if ((flags & BRIDGE_FLAGS_SELF)) {
2522                 if (!dev->netdev_ops->ndo_bridge_setlink)
2523                         err = -EOPNOTSUPP;
2524                 else
2525                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2526
2527                 if (!err)
2528                         flags &= ~BRIDGE_FLAGS_SELF;
2529         }
2530
2531         if (have_flags)
2532                 memcpy(nla_data(attr), &flags, sizeof(flags));
2533         /* Generate event to notify upper layer of bridge change */
2534         if (!err)
2535                 err = rtnl_bridge_notify(dev, oflags);
2536 out:
2537         return err;
2538 }
2539
2540 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2541 {
2542         struct net *net = sock_net(skb->sk);
2543         struct ifinfomsg *ifm;
2544         struct net_device *dev;
2545         struct nlattr *br_spec, *attr = NULL;
2546         int rem, err = -EOPNOTSUPP;
2547         u16 oflags, flags = 0;
2548         bool have_flags = false;
2549
2550         if (nlmsg_len(nlh) < sizeof(*ifm))
2551                 return -EINVAL;
2552
2553         ifm = nlmsg_data(nlh);
2554         if (ifm->ifi_family != AF_BRIDGE)
2555                 return -EPFNOSUPPORT;
2556
2557         dev = __dev_get_by_index(net, ifm->ifi_index);
2558         if (!dev) {
2559                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2560                 return -ENODEV;
2561         }
2562
2563         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2564         if (br_spec) {
2565                 nla_for_each_nested(attr, br_spec, rem) {
2566                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2567                                 have_flags = true;
2568                                 flags = nla_get_u16(attr);
2569                                 break;
2570                         }
2571                 }
2572         }
2573
2574         oflags = flags;
2575
2576         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2577                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2578
2579                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2580                         err = -EOPNOTSUPP;
2581                         goto out;
2582                 }
2583
2584                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2585                 if (err)
2586                         goto out;
2587
2588                 flags &= ~BRIDGE_FLAGS_MASTER;
2589         }
2590
2591         if ((flags & BRIDGE_FLAGS_SELF)) {
2592                 if (!dev->netdev_ops->ndo_bridge_dellink)
2593                         err = -EOPNOTSUPP;
2594                 else
2595                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2596
2597                 if (!err)
2598                         flags &= ~BRIDGE_FLAGS_SELF;
2599         }
2600
2601         if (have_flags)
2602                 memcpy(nla_data(attr), &flags, sizeof(flags));
2603         /* Generate event to notify upper layer of bridge change */
2604         if (!err)
2605                 err = rtnl_bridge_notify(dev, oflags);
2606 out:
2607         return err;
2608 }
2609
2610 /* Process one rtnetlink message. */
2611
2612 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2613 {
2614         struct net *net = sock_net(skb->sk);
2615         rtnl_doit_func doit;
2616         int sz_idx, kind;
2617         int family;
2618         int type;
2619         int err;
2620
2621         type = nlh->nlmsg_type;
2622         if (type > RTM_MAX)
2623                 return -EOPNOTSUPP;
2624
2625         type -= RTM_BASE;
2626
2627         /* All the messages must have at least 1 byte length */
2628         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2629                 return 0;
2630
2631         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2632         sz_idx = type>>2;
2633         kind = type&3;
2634
2635         if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2636                 return -EPERM;
2637
2638         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2639                 struct sock *rtnl;
2640                 rtnl_dumpit_func dumpit;
2641                 rtnl_calcit_func calcit;
2642                 u16 min_dump_alloc = 0;
2643
2644                 dumpit = rtnl_get_dumpit(family, type);
2645                 if (dumpit == NULL)
2646                         return -EOPNOTSUPP;
2647                 calcit = rtnl_get_calcit(family, type);
2648                 if (calcit)
2649                         min_dump_alloc = calcit(skb, nlh);
2650
2651                 __rtnl_unlock();
2652                 rtnl = net->rtnl;
2653                 {
2654                         struct netlink_dump_control c = {
2655                                 .dump           = dumpit,
2656                                 .min_dump_alloc = min_dump_alloc,
2657                         };
2658                         err = netlink_dump_start(rtnl, skb, nlh, &c);
2659                 }
2660                 rtnl_lock();
2661                 return err;
2662         }
2663
2664         doit = rtnl_get_doit(family, type);
2665         if (doit == NULL)
2666                 return -EOPNOTSUPP;
2667
2668         return doit(skb, nlh);
2669 }
2670
2671 static void rtnetlink_rcv(struct sk_buff *skb)
2672 {
2673         rtnl_lock();
2674         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2675         rtnl_unlock();
2676 }
2677
2678 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2679 {
2680         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2681
2682         switch (event) {
2683         case NETDEV_UP:
2684         case NETDEV_DOWN:
2685         case NETDEV_PRE_UP:
2686         case NETDEV_POST_INIT:
2687         case NETDEV_REGISTER:
2688         case NETDEV_CHANGE:
2689         case NETDEV_PRE_TYPE_CHANGE:
2690         case NETDEV_GOING_DOWN:
2691         case NETDEV_UNREGISTER:
2692         case NETDEV_UNREGISTER_FINAL:
2693         case NETDEV_RELEASE:
2694         case NETDEV_JOIN:
2695                 break;
2696         default:
2697                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2698                 break;
2699         }
2700         return NOTIFY_DONE;
2701 }
2702
2703 static struct notifier_block rtnetlink_dev_notifier = {
2704         .notifier_call  = rtnetlink_event,
2705 };
2706
2707
2708 static int __net_init rtnetlink_net_init(struct net *net)
2709 {
2710         struct sock *sk;
2711         struct netlink_kernel_cfg cfg = {
2712                 .groups         = RTNLGRP_MAX,
2713                 .input          = rtnetlink_rcv,
2714                 .cb_mutex       = &rtnl_mutex,
2715                 .flags          = NL_CFG_F_NONROOT_RECV,
2716         };
2717
2718         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
2719         if (!sk)
2720                 return -ENOMEM;
2721         net->rtnl = sk;
2722         return 0;
2723 }
2724
2725 static void __net_exit rtnetlink_net_exit(struct net *net)
2726 {
2727         netlink_kernel_release(net->rtnl);
2728         net->rtnl = NULL;
2729 }
2730
2731 static struct pernet_operations rtnetlink_net_ops = {
2732         .init = rtnetlink_net_init,
2733         .exit = rtnetlink_net_exit,
2734 };
2735
2736 void __init rtnetlink_init(void)
2737 {
2738         if (register_pernet_subsys(&rtnetlink_net_ops))
2739                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2740
2741         register_netdevice_notifier(&rtnetlink_dev_notifier);
2742
2743         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2744                       rtnl_dump_ifinfo, rtnl_calcit);
2745         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2746         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2747         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2748
2749         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2750         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2751
2752         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
2753         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
2754         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
2755
2756         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
2757         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
2758         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
2759 }
2760