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