net/core/rtnetlink.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Routing netlink socket interface: protocol independent part.
   7  *
   8  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   9  *
  10  *              This program is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  *
  15  *      Fixes:
  16  *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
  17  */
  18
  19 #include <linux/errno.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/socket.h>
  23 #include <linux/kernel.h>
  24 #include <linux/timer.h>
  25 #include <linux/string.h>
  26 #include <linux/sockios.h>
  27 #include <linux/net.h>
  28 #include <linux/fcntl.h>
  29 #include <linux/mm.h>
  30 #include <linux/slab.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/capability.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/init.h>
  35 #include <linux/security.h>
  36 #include <linux/mutex.h>
  37 #include <linux/if_addr.h>
  38 #include <linux/if_bridge.h>
  39 #include <linux/if_vlan.h>
  40 #include <linux/pci.h>
  41 #include <linux/etherdevice.h>
  42
  43 #include <asm/uaccess.h>
  44
  45 #include <linux/inet.h>
  46 #include <linux/netdevice.h>
  47 #include <net/switchdev.h>
  48 #include <net/ip.h>
  49 #include <net/protocol.h>
  50 #include <net/arp.h>
  51 #include <net/route.h>
  52 #include <net/udp.h>
  53 #include <net/sock.h>
  54 #include <net/pkt_sched.h>
  55 #include <net/fib_rules.h>
  56 #include <net/rtnetlink.h>
  57 #include <net/net_namespace.h>
  58
  59 struct rtnl_link {
  60         rtnl_doit_func          doit;
  61         rtnl_dumpit_func        dumpit;
  62         rtnl_calcit_func        calcit;
  63 };
  64
  65 static DEFINE_MUTEX(rtnl_mutex);
  66
  67 void rtnl_lock(void)
  68 {
  69         mutex_lock(&rtnl_mutex);
  70 }
  71 EXPORT_SYMBOL(rtnl_lock);
  72
  73 void __rtnl_unlock(void)
  74 {
  75         mutex_unlock(&rtnl_mutex);
  76 }
  77
  78 void rtnl_unlock(void)
  79 {
  80         /* This fellow will unlock it for us. */
  81         netdev_run_todo();
  82 }
  83 EXPORT_SYMBOL(rtnl_unlock);
  84
  85 int rtnl_trylock(void)
  86 {
  87         return mutex_trylock(&rtnl_mutex);
  88 }
  89 EXPORT_SYMBOL(rtnl_trylock);
  90
  91 int rtnl_is_locked(void)
  92 {
  93         return mutex_is_locked(&rtnl_mutex);
  94 }
  95 EXPORT_SYMBOL(rtnl_is_locked);
  96
  97 #ifdef CONFIG_PROVE_LOCKING
  98 int lockdep_rtnl_is_held(void)
  99 {
 100         return lockdep_is_held(&rtnl_mutex);
 101 }
 102 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 103 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 104
 105 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 106
 107 static inline int rtm_msgindex(int msgtype)
 108 {
 109         int msgindex = msgtype - RTM_BASE;
 110
 111         /*
 112          * msgindex < 0 implies someone tried to register a netlink
 113          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 114          * the message type has not been added to linux/rtnetlink.h
 115          */
 116         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 117
 118         return msgindex;
 119 }
 120
 121 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
 122 {
 123         struct rtnl_link *tab;
 124
 125         if (protocol <= RTNL_FAMILY_MAX)
 126                 tab = rtnl_msg_handlers[protocol];
 127         else
 128                 tab = NULL;
 129
 130         if (tab == NULL || tab[msgindex].doit == NULL)
 131                 tab = rtnl_msg_handlers[PF_UNSPEC];
 132
 133         return tab[msgindex].doit;
 134 }
 135
 136 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
 137 {
 138         struct rtnl_link *tab;
 139
 140         if (protocol <= RTNL_FAMILY_MAX)
 141                 tab = rtnl_msg_handlers[protocol];
 142         else
 143                 tab = NULL;
 144
 145         if (tab == NULL || tab[msgindex].dumpit == NULL)
 146                 tab = rtnl_msg_handlers[PF_UNSPEC];
 147
 148         return tab[msgindex].dumpit;
 149 }
 150
 151 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
 152 {
 153         struct rtnl_link *tab;
 154
 155         if (protocol <= RTNL_FAMILY_MAX)
 156                 tab = rtnl_msg_handlers[protocol];
 157         else
 158                 tab = NULL;
 159
 160         if (tab == NULL || tab[msgindex].calcit == NULL)
 161                 tab = rtnl_msg_handlers[PF_UNSPEC];
 162
 163         return tab[msgindex].calcit;
 164 }
 165
 166 /**
 167  * __rtnl_register - Register a rtnetlink message type
 168  * @protocol: Protocol family or PF_UNSPEC
 169  * @msgtype: rtnetlink message type
 170  * @doit: Function pointer called for each request message
 171  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 172  * @calcit: Function pointer to calc size of dump message
 173  *
 174  * Registers the specified function pointers (at least one of them has
 175  * to be non-NULL) to be called whenever a request message for the
 176  * specified protocol family and message type is received.
 177  *
 178  * The special protocol family PF_UNSPEC may be used to define fallback
 179  * function pointers for the case when no entry for the specific protocol
 180  * family exists.
 181  *
 182  * Returns 0 on success or a negative error code.
 183  */
 184 int __rtnl_register(int protocol, int msgtype,
 185                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 186                     rtnl_calcit_func calcit)
 187 {
 188         struct rtnl_link *tab;
 189         int msgindex;
 190
 191         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 192         msgindex = rtm_msgindex(msgtype);
 193
 194         tab = rtnl_msg_handlers[protocol];
 195         if (tab == NULL) {
 196                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 197                 if (tab == NULL)
 198                         return -ENOBUFS;
 199
 200                 rtnl_msg_handlers[protocol] = tab;
 201         }
 202
 203         if (doit)
 204                 tab[msgindex].doit = doit;
 205
 206         if (dumpit)
 207                 tab[msgindex].dumpit = dumpit;
 208
 209         if (calcit)
 210                 tab[msgindex].calcit = calcit;
 211
 212         return 0;
 213 }
 214 EXPORT_SYMBOL_GPL(__rtnl_register);
 215
 216 /**
 217  * rtnl_register - Register a rtnetlink message type
 218  *
 219  * Identical to __rtnl_register() but panics on failure. This is useful
 220  * as failure of this function is very unlikely, it can only happen due
 221  * to lack of memory when allocating the chain to store all message
 222  * handlers for a protocol. Meant for use in init functions where lack
 223  * of memory implies no sense in continuing.
 224  */
 225 void rtnl_register(int protocol, int msgtype,
 226                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 227                    rtnl_calcit_func calcit)
 228 {
 229         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
 230                 panic("Unable to register rtnetlink message handler, "
 231                       "protocol = %d, message type = %d\n",
 232                       protocol, msgtype);
 233 }
 234 EXPORT_SYMBOL_GPL(rtnl_register);
 235
 236 /**
 237  * rtnl_unregister - Unregister a rtnetlink message type
 238  * @protocol: Protocol family or PF_UNSPEC
 239  * @msgtype: rtnetlink message type
 240  *
 241  * Returns 0 on success or a negative error code.
 242  */
 243 int rtnl_unregister(int protocol, int msgtype)
 244 {
 245         int msgindex;
 246
 247         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 248         msgindex = rtm_msgindex(msgtype);
 249
 250         if (rtnl_msg_handlers[protocol] == NULL)
 251                 return -ENOENT;
 252
 253         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 254         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
 255
 256         return 0;
 257 }
 258 EXPORT_SYMBOL_GPL(rtnl_unregister);
 259
 260 /**
 261  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 262  * @protocol : Protocol family or PF_UNSPEC
 263  *
 264  * Identical to calling rtnl_unregster() for all registered message types
 265  * of a certain protocol family.
 266  */
 267 void rtnl_unregister_all(int protocol)
 268 {
 269         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 270
 271         kfree(rtnl_msg_handlers[protocol]);
 272         rtnl_msg_handlers[protocol] = NULL;
 273 }
 274 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 275
 276 static LIST_HEAD(link_ops);
 277
 278 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 279 {
 280         const struct rtnl_link_ops *ops;
 281
 282         list_for_each_entry(ops, &link_ops, list) {
 283                 if (!strcmp(ops->kind, kind))
 284                         return ops;
 285         }
 286         return NULL;
 287 }
 288
 289 /**
 290  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 291  * @ops: struct rtnl_link_ops * to register
 292  *
 293  * The caller must hold the rtnl_mutex. This function should be used
 294  * by drivers that create devices during module initialization. It
 295  * must be called before registering the devices.
 296  *
 297  * Returns 0 on success or a negative error code.
 298  */
 299 int __rtnl_link_register(struct rtnl_link_ops *ops)
 300 {
 301         if (rtnl_link_ops_get(ops->kind))
 302                 return -EEXIST;
 303
 304         /* The check for setup is here because if ops
 305          * does not have that filled up, it is not possible
 306          * to use the ops for creating device. So do not
 307          * fill up dellink as well. That disables rtnl_dellink.
 308          */
 309         if (ops->setup && !ops->dellink)
 310                 ops->dellink = unregister_netdevice_queue;
 311
 312         list_add_tail(&ops->list, &link_ops);
 313         return 0;
 314 }
 315 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 316
 317 /**
 318  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 319  * @ops: struct rtnl_link_ops * to register
 320  *
 321  * Returns 0 on success or a negative error code.
 322  */
 323 int rtnl_link_register(struct rtnl_link_ops *ops)
 324 {
 325         int err;
 326
 327         rtnl_lock();
 328         err = __rtnl_link_register(ops);
 329         rtnl_unlock();
 330         return err;
 331 }
 332 EXPORT_SYMBOL_GPL(rtnl_link_register);
 333
 334 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 335 {
 336         struct net_device *dev;
 337         LIST_HEAD(list_kill);
 338
 339         for_each_netdev(net, dev) {
 340                 if (dev->rtnl_link_ops == ops)
 341                         ops->dellink(dev, &list_kill);
 342         }
 343         unregister_netdevice_many(&list_kill);
 344 }
 345
 346 /**
 347  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 348  * @ops: struct rtnl_link_ops * to unregister
 349  *
 350  * The caller must hold the rtnl_mutex.
 351  */
 352 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 353 {
 354         struct net *net;
 355
 356         for_each_net(net) {
 357                 __rtnl_kill_links(net, ops);
 358         }
 359         list_del(&ops->list);
 360 }
 361 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 362
 363 /* Return with the rtnl_lock held when there are no network
 364  * devices unregistering in any network namespace.
 365  */
 366 static void rtnl_lock_unregistering_all(void)
 367 {
 368         struct net *net;
 369         bool unregistering;
 370         DEFINE_WAIT(wait);
 371
 372         for (;;) {
 373                 prepare_to_wait(&netdev_unregistering_wq, &wait,
 374                                 TASK_UNINTERRUPTIBLE);
 375                 unregistering = false;
 376                 rtnl_lock();
 377                 for_each_net(net) {
 378                         if (net->dev_unreg_count > 0) {
 379                                 unregistering = true;
 380                                 break;
 381                         }
 382                 }
 383                 if (!unregistering)
 384                         break;
 385                 __rtnl_unlock();
 386                 schedule();
 387         }
 388         finish_wait(&netdev_unregistering_wq, &wait);
 389 }
 390
 391 /**
 392  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 393  * @ops: struct rtnl_link_ops * to unregister
 394  */
 395 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 396 {
 397         /* Close the race with cleanup_net() */
 398         mutex_lock(&net_mutex);
 399         rtnl_lock_unregistering_all();
 400         __rtnl_link_unregister(ops);
 401         rtnl_unlock();
 402         mutex_unlock(&net_mutex);
 403 }
 404 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 405
 406 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 407 {
 408         struct net_device *master_dev;
 409         const struct rtnl_link_ops *ops;
 410
 411         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 412         if (!master_dev)
 413                 return 0;
 414         ops = master_dev->rtnl_link_ops;
 415         if (!ops || !ops->get_slave_size)
 416                 return 0;
 417         /* IFLA_INFO_SLAVE_DATA + nested data */
 418         return nla_total_size(sizeof(struct nlattr)) +
 419                ops->get_slave_size(master_dev, dev);
 420 }
 421
 422 static size_t rtnl_link_get_size(const struct net_device *dev)
 423 {
 424         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 425         size_t size;
 426
 427         if (!ops)
 428                 return 0;
 429
 430         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 431                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 432
 433         if (ops->get_size)
 434                 /* IFLA_INFO_DATA + nested data */
 435                 size += nla_total_size(sizeof(struct nlattr)) +
 436                         ops->get_size(dev);
 437
 438         if (ops->get_xstats_size)
 439                 /* IFLA_INFO_XSTATS */
 440                 size += nla_total_size(ops->get_xstats_size(dev));
 441
 442         size += rtnl_link_get_slave_info_data_size(dev);
 443
 444         return size;
 445 }
 446
 447 static LIST_HEAD(rtnl_af_ops);
 448
 449 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 450 {
 451         const struct rtnl_af_ops *ops;
 452
 453         list_for_each_entry(ops, &rtnl_af_ops, list) {
 454                 if (ops->family == family)
 455                         return ops;
 456         }
 457
 458         return NULL;
 459 }
 460
 461 /**
 462  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 463  * @ops: struct rtnl_af_ops * to register
 464  *
 465  * Returns 0 on success or a negative error code.
 466  */
 467 void rtnl_af_register(struct rtnl_af_ops *ops)
 468 {
 469         rtnl_lock();
 470         list_add_tail(&ops->list, &rtnl_af_ops);
 471         rtnl_unlock();
 472 }
 473 EXPORT_SYMBOL_GPL(rtnl_af_register);
 474
 475 /**
 476  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 477  * @ops: struct rtnl_af_ops * to unregister
 478  *
 479  * The caller must hold the rtnl_mutex.
 480  */
 481 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 482 {
 483         list_del(&ops->list);
 484 }
 485 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 486
 487 /**
 488  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 489  * @ops: struct rtnl_af_ops * to unregister
 490  */
 491 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 492 {
 493         rtnl_lock();
 494         __rtnl_af_unregister(ops);
 495         rtnl_unlock();
 496 }
 497 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 498
 499 static size_t rtnl_link_get_af_size(const struct net_device *dev)
 500 {
 501         struct rtnl_af_ops *af_ops;
 502         size_t size;
 503
 504         /* IFLA_AF_SPEC */
 505         size = nla_total_size(sizeof(struct nlattr));
 506
 507         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 508                 if (af_ops->get_link_af_size) {
 509                         /* AF_* + nested data */
 510                         size += nla_total_size(sizeof(struct nlattr)) +
 511                                 af_ops->get_link_af_size(dev);
 512                 }
 513         }
 514
 515         return size;
 516 }
 517
 518 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 519 {
 520         struct net_device *master_dev;
 521
 522         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 523         if (master_dev && master_dev->rtnl_link_ops)
 524                 return true;
 525         return false;
 526 }
 527
 528 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 529                                      const struct net_device *dev)
 530 {
 531         struct net_device *master_dev;
 532         const struct rtnl_link_ops *ops;
 533         struct nlattr *slave_data;
 534         int err;
 535
 536         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 537         if (!master_dev)
 538                 return 0;
 539         ops = master_dev->rtnl_link_ops;
 540         if (!ops)
 541                 return 0;
 542         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 543                 return -EMSGSIZE;
 544         if (ops->fill_slave_info) {
 545                 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
 546                 if (!slave_data)
 547                         return -EMSGSIZE;
 548                 err = ops->fill_slave_info(skb, master_dev, dev);
 549                 if (err < 0)
 550                         goto err_cancel_slave_data;
 551                 nla_nest_end(skb, slave_data);
 552         }
 553         return 0;
 554
 555 err_cancel_slave_data:
 556         nla_nest_cancel(skb, slave_data);
 557         return err;
 558 }
 559
 560 static int rtnl_link_info_fill(struct sk_buff *skb,
 561                                const struct net_device *dev)
 562 {
 563         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 564         struct nlattr *data;
 565         int err;
 566
 567         if (!ops)
 568                 return 0;
 569         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 570                 return -EMSGSIZE;
 571         if (ops->fill_xstats) {
 572                 err = ops->fill_xstats(skb, dev);
 573                 if (err < 0)
 574                         return err;
 575         }
 576         if (ops->fill_info) {
 577                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 578                 if (data == NULL)
 579                         return -EMSGSIZE;
 580                 err = ops->fill_info(skb, dev);
 581                 if (err < 0)
 582                         goto err_cancel_data;
 583                 nla_nest_end(skb, data);
 584         }
 585         return 0;
 586
 587 err_cancel_data:
 588         nla_nest_cancel(skb, data);
 589         return err;
 590 }
 591
 592 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 593 {
 594         struct nlattr *linkinfo;
 595         int err = -EMSGSIZE;
 596
 597         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 598         if (linkinfo == NULL)
 599                 goto out;
 600
 601         err = rtnl_link_info_fill(skb, dev);
 602         if (err < 0)
 603                 goto err_cancel_link;
 604
 605         err = rtnl_link_slave_info_fill(skb, dev);
 606         if (err < 0)
 607                 goto err_cancel_link;
 608
 609         nla_nest_end(skb, linkinfo);
 610         return 0;
 611
 612 err_cancel_link:
 613         nla_nest_cancel(skb, linkinfo);
 614 out:
 615         return err;
 616 }
 617
 618 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 619 {
 620         struct sock *rtnl = net->rtnl;
 621         int err = 0;
 622
 623         NETLINK_CB(skb).dst_group = group;
 624         if (echo)
 625                 atomic_inc(&skb->users);
 626         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 627         if (echo)
 628                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 629         return err;
 630 }
 631
 632 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 633 {
 634         struct sock *rtnl = net->rtnl;
 635
 636         return nlmsg_unicast(rtnl, skb, pid);
 637 }
 638 EXPORT_SYMBOL(rtnl_unicast);
 639
 640 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 641                  struct nlmsghdr *nlh, gfp_t flags)
 642 {
 643         struct sock *rtnl = net->rtnl;
 644         int report = 0;
 645
 646         if (nlh)
 647                 report = nlmsg_report(nlh);
 648
 649         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 650 }
 651 EXPORT_SYMBOL(rtnl_notify);
 652
 653 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 654 {
 655         struct sock *rtnl = net->rtnl;
 656
 657         netlink_set_err(rtnl, 0, group, error);
 658 }
 659 EXPORT_SYMBOL(rtnl_set_sk_err);
 660
 661 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 662 {
 663         struct nlattr *mx;
 664         int i, valid = 0;
 665
 666         mx = nla_nest_start(skb, RTA_METRICS);
 667         if (mx == NULL)
 668                 return -ENOBUFS;
 669
 670         for (i = 0; i < RTAX_MAX; i++) {
 671                 if (metrics[i]) {
 672                         valid++;
 673                         if (nla_put_u32(skb, i+1, metrics[i]))
 674                                 goto nla_put_failure;
 675                 }
 676         }
 677
 678         if (!valid) {
 679                 nla_nest_cancel(skb, mx);
 680                 return 0;
 681         }
 682
 683         return nla_nest_end(skb, mx);
 684
 685 nla_put_failure:
 686         nla_nest_cancel(skb, mx);
 687         return -EMSGSIZE;
 688 }
 689 EXPORT_SYMBOL(rtnetlink_put_metrics);
 690
 691 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 692                        long expires, u32 error)
 693 {
 694         struct rta_cacheinfo ci = {
 695                 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
 696                 .rta_used = dst->__use,
 697                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 698                 .rta_error = error,
 699                 .rta_id =  id,
 700         };
 701
 702         if (expires) {
 703                 unsigned long clock;
 704
 705                 clock = jiffies_to_clock_t(abs(expires));
 706                 clock = min_t(unsigned long, clock, INT_MAX);
 707                 ci.rta_expires = (expires > 0) ? clock : -clock;
 708         }
 709         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 710 }
 711 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 712
 713 static void set_operstate(struct net_device *dev, unsigned char transition)
 714 {
 715         unsigned char operstate = dev->operstate;
 716
 717         switch (transition) {
 718         case IF_OPER_UP:
 719                 if ((operstate == IF_OPER_DORMANT ||
 720                      operstate == IF_OPER_UNKNOWN) &&
 721                     !netif_dormant(dev))
 722                         operstate = IF_OPER_UP;
 723                 break;
 724
 725         case IF_OPER_DORMANT:
 726                 if (operstate == IF_OPER_UP ||
 727                     operstate == IF_OPER_UNKNOWN)
 728                         operstate = IF_OPER_DORMANT;
 729                 break;
 730         }
 731
 732         if (dev->operstate != operstate) {
 733                 write_lock_bh(&dev_base_lock);
 734                 dev->operstate = operstate;
 735                 write_unlock_bh(&dev_base_lock);
 736                 netdev_state_change(dev);
 737         }
 738 }
 739
 740 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 741 {
 742         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 743                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 744 }
 745
 746 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 747                                            const struct ifinfomsg *ifm)
 748 {
 749         unsigned int flags = ifm->ifi_flags;
 750
 751         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 752         if (ifm->ifi_change)
 753                 flags = (flags & ifm->ifi_change) |
 754                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 755
 756         return flags;
 757 }
 758
 759 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 760                                  const struct rtnl_link_stats64 *b)
 761 {
 762         a->rx_packets = b->rx_packets;
 763         a->tx_packets = b->tx_packets;
 764         a->rx_bytes = b->rx_bytes;
 765         a->tx_bytes = b->tx_bytes;
 766         a->rx_errors = b->rx_errors;
 767         a->tx_errors = b->tx_errors;
 768         a->rx_dropped = b->rx_dropped;
 769         a->tx_dropped = b->tx_dropped;
 770
 771         a->multicast = b->multicast;
 772         a->collisions = b->collisions;
 773
 774         a->rx_length_errors = b->rx_length_errors;
 775         a->rx_over_errors = b->rx_over_errors;
 776         a->rx_crc_errors = b->rx_crc_errors;
 777         a->rx_frame_errors = b->rx_frame_errors;
 778         a->rx_fifo_errors = b->rx_fifo_errors;
 779         a->rx_missed_errors = b->rx_missed_errors;
 780
 781         a->tx_aborted_errors = b->tx_aborted_errors;
 782         a->tx_carrier_errors = b->tx_carrier_errors;
 783         a->tx_fifo_errors = b->tx_fifo_errors;
 784         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 785         a->tx_window_errors = b->tx_window_errors;
 786
 787         a->rx_compressed = b->rx_compressed;
 788         a->tx_compressed = b->tx_compressed;
 789 }
 790
 791 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
 792 {
 793         memcpy(v, b, sizeof(*b));
 794 }
 795
 796 /* All VF info */
 797 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 798                                    u32 ext_filter_mask)
 799 {
 800         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 801             (ext_filter_mask & RTEXT_FILTER_VF)) {
 802                 int num_vfs = dev_num_vf(dev->dev.parent);
 803                 size_t size = nla_total_size(sizeof(struct nlattr));
 804                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 805                 size += num_vfs *
 806                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 807                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 808                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 809                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 810                          nla_total_size(sizeof(struct ifla_vf_link_state)));
 811                 return size;
 812         } else
 813                 return 0;
 814 }
 815
 816 static size_t rtnl_port_size(const struct net_device *dev,
 817                              u32 ext_filter_mask)
 818 {
 819         size_t port_size = nla_total_size(4)            /* PORT_VF */
 820                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 821                 + nla_total_size(sizeof(struct ifla_port_vsi))
 822                                                         /* PORT_VSI_TYPE */
 823                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 824                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 825                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 826                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 827         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 828         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 829                 + port_size;
 830         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 831                 + port_size;
 832
 833         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 834             !(ext_filter_mask & RTEXT_FILTER_VF))
 835                 return 0;
 836         if (dev_num_vf(dev->dev.parent))
 837                 return port_self_size + vf_ports_size +
 838                         vf_port_size * dev_num_vf(dev->dev.parent);
 839         else
 840                 return port_self_size;
 841 }
 842
 843 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 844                                      u32 ext_filter_mask)
 845 {
 846         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 847                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 848                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 849                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 850                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 851                + nla_total_size(sizeof(struct rtnl_link_stats))
 852                + nla_total_size(sizeof(struct rtnl_link_stats64))
 853                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 854                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 855                + nla_total_size(4) /* IFLA_TXQLEN */
 856                + nla_total_size(4) /* IFLA_WEIGHT */
 857                + nla_total_size(4) /* IFLA_MTU */
 858                + nla_total_size(4) /* IFLA_LINK */
 859                + nla_total_size(4) /* IFLA_MASTER */
 860                + nla_total_size(1) /* IFLA_CARRIER */
 861                + nla_total_size(4) /* IFLA_PROMISCUITY */
 862                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 863                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 864                + nla_total_size(1) /* IFLA_OPERSTATE */
 865                + nla_total_size(1) /* IFLA_LINKMODE */
 866                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
 867                + nla_total_size(ext_filter_mask
 868                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 869                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 870                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 871                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 872                + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
 873                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
 874                + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_SWITCH_ID */
 875 }
 876
 877 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 878 {
 879         struct nlattr *vf_ports;
 880         struct nlattr *vf_port;
 881         int vf;
 882         int err;
 883
 884         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 885         if (!vf_ports)
 886                 return -EMSGSIZE;
 887
 888         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 889                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 890                 if (!vf_port)
 891                         goto nla_put_failure;
 892                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 893                         goto nla_put_failure;
 894                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 895                 if (err == -EMSGSIZE)
 896                         goto nla_put_failure;
 897                 if (err) {
 898                         nla_nest_cancel(skb, vf_port);
 899                         continue;
 900                 }
 901                 nla_nest_end(skb, vf_port);
 902         }
 903
 904         nla_nest_end(skb, vf_ports);
 905
 906         return 0;
 907
 908 nla_put_failure:
 909         nla_nest_cancel(skb, vf_ports);
 910         return -EMSGSIZE;
 911 }
 912
 913 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 914 {
 915         struct nlattr *port_self;
 916         int err;
 917
 918         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 919         if (!port_self)
 920                 return -EMSGSIZE;
 921
 922         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 923         if (err) {
 924                 nla_nest_cancel(skb, port_self);
 925                 return (err == -EMSGSIZE) ? err : 0;
 926         }
 927
 928         nla_nest_end(skb, port_self);
 929
 930         return 0;
 931 }
 932
 933 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
 934                           u32 ext_filter_mask)
 935 {
 936         int err;
 937
 938         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 939             !(ext_filter_mask & RTEXT_FILTER_VF))
 940                 return 0;
 941
 942         err = rtnl_port_self_fill(skb, dev);
 943         if (err)
 944                 return err;
 945
 946         if (dev_num_vf(dev->dev.parent)) {
 947                 err = rtnl_vf_ports_fill(skb, dev);
 948                 if (err)
 949                         return err;
 950         }
 951
 952         return 0;
 953 }
 954
 955 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
 956 {
 957         int err;
 958         struct netdev_phys_item_id ppid;
 959
 960         err = dev_get_phys_port_id(dev, &ppid);
 961         if (err) {
 962                 if (err == -EOPNOTSUPP)
 963                         return 0;
 964                 return err;
 965         }
 966
 967         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
 968                 return -EMSGSIZE;
 969
 970         return 0;
 971 }
 972
 973 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
 974 {
 975         int err;
 976         struct netdev_phys_item_id psid;
 977
 978         err = netdev_switch_parent_id_get(dev, &psid);
 979         if (err) {
 980                 if (err == -EOPNOTSUPP)
 981                         return 0;
 982                 return err;
 983         }
 984
 985         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, psid.id_len, psid.id))
 986                 return -EMSGSIZE;
 987
 988         return 0;
 989 }
 990
 991 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 992                             int type, u32 pid, u32 seq, u32 change,
 993                             unsigned int flags, u32 ext_filter_mask)
 994 {
 995         struct ifinfomsg *ifm;
 996         struct nlmsghdr *nlh;
 997         struct rtnl_link_stats64 temp;
 998         const struct rtnl_link_stats64 *stats;
 999         struct nlattr *attr, *af_spec;
1000         struct rtnl_af_ops *af_ops;
1001         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1002
1003         ASSERT_RTNL();
1004         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1005         if (nlh == NULL)
1006                 return -EMSGSIZE;
1007
1008         ifm = nlmsg_data(nlh);
1009         ifm->ifi_family = AF_UNSPEC;
1010         ifm->__ifi_pad = 0;
1011         ifm->ifi_type = dev->type;
1012         ifm->ifi_index = dev->ifindex;
1013         ifm->ifi_flags = dev_get_flags(dev);
1014         ifm->ifi_change = change;
1015
1016         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1017             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1018             nla_put_u8(skb, IFLA_OPERSTATE,
1019                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1020             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1021             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1022             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1023             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1024             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1025 #ifdef CONFIG_RPS
1026             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1027 #endif
1028             (dev->ifindex != dev->iflink &&
1029              nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
1030             (upper_dev &&
1031              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1032             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1033             (dev->qdisc &&
1034              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1035             (dev->ifalias &&
1036              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1037             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1038                         atomic_read(&dev->carrier_changes)))
1039                 goto nla_put_failure;
1040
1041         if (1) {
1042                 struct rtnl_link_ifmap map = {
1043                         .mem_start   = dev->mem_start,
1044                         .mem_end     = dev->mem_end,
1045                         .base_addr   = dev->base_addr,
1046                         .irq         = dev->irq,
1047                         .dma         = dev->dma,
1048                         .port        = dev->if_port,
1049                 };
1050                 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1051                         goto nla_put_failure;
1052         }
1053
1054         if (dev->addr_len) {
1055                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1056                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1057                         goto nla_put_failure;
1058         }
1059
1060         if (rtnl_phys_port_id_fill(skb, dev))
1061                 goto nla_put_failure;
1062
1063         if (rtnl_phys_switch_id_fill(skb, dev))
1064                 goto nla_put_failure;
1065
1066         attr = nla_reserve(skb, IFLA_STATS,
1067                         sizeof(struct rtnl_link_stats));
1068         if (attr == NULL)
1069                 goto nla_put_failure;
1070
1071         stats = dev_get_stats(dev, &temp);
1072         copy_rtnl_link_stats(nla_data(attr), stats);
1073
1074         attr = nla_reserve(skb, IFLA_STATS64,
1075                         sizeof(struct rtnl_link_stats64));
1076         if (attr == NULL)
1077                 goto nla_put_failure;
1078         copy_rtnl_link_stats64(nla_data(attr), stats);
1079
1080         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1081             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1082                 goto nla_put_failure;
1083
1084         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1085             && (ext_filter_mask & RTEXT_FILTER_VF)) {
1086                 int i;
1087
1088                 struct nlattr *vfinfo, *vf;
1089                 int num_vfs = dev_num_vf(dev->dev.parent);
1090
1091                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1092                 if (!vfinfo)
1093                         goto nla_put_failure;
1094                 for (i = 0; i < num_vfs; i++) {
1095                         struct ifla_vf_info ivi;
1096                         struct ifla_vf_mac vf_mac;
1097                         struct ifla_vf_vlan vf_vlan;
1098                         struct ifla_vf_rate vf_rate;
1099                         struct ifla_vf_tx_rate vf_tx_rate;
1100                         struct ifla_vf_spoofchk vf_spoofchk;
1101                         struct ifla_vf_link_state vf_linkstate;
1102
1103                         /*
1104                          * Not all SR-IOV capable drivers support the
1105                          * spoofcheck query.  Preset to -1 so the user
1106                          * space tool can detect that the driver didn't
1107                          * report anything.
1108                          */
1109                         ivi.spoofchk = -1;
1110                         memset(ivi.mac, 0, sizeof(ivi.mac));
1111                         /* The default value for VF link state is "auto"
1112                          * IFLA_VF_LINK_STATE_AUTO which equals zero
1113                          */
1114                         ivi.linkstate = 0;
1115                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1116                                 break;
1117                         vf_mac.vf =
1118                                 vf_vlan.vf =
1119                                 vf_rate.vf =
1120                                 vf_tx_rate.vf =
1121                                 vf_spoofchk.vf =
1122                                 vf_linkstate.vf = ivi.vf;
1123
1124                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1125                         vf_vlan.vlan = ivi.vlan;
1126                         vf_vlan.qos = ivi.qos;
1127                         vf_tx_rate.rate = ivi.max_tx_rate;
1128                         vf_rate.min_tx_rate = ivi.min_tx_rate;
1129                         vf_rate.max_tx_rate = ivi.max_tx_rate;
1130                         vf_spoofchk.setting = ivi.spoofchk;
1131                         vf_linkstate.link_state = ivi.linkstate;
1132                         vf = nla_nest_start(skb, IFLA_VF_INFO);
1133                         if (!vf) {
1134                                 nla_nest_cancel(skb, vfinfo);
1135                                 goto nla_put_failure;
1136                         }
1137                         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1138                             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1139                             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1140                                     &vf_rate) ||
1141                             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1142                                     &vf_tx_rate) ||
1143                             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1144                                     &vf_spoofchk) ||
1145                             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1146                                     &vf_linkstate))
1147                                 goto nla_put_failure;
1148                         nla_nest_end(skb, vf);
1149                 }
1150                 nla_nest_end(skb, vfinfo);
1151         }
1152
1153         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1154                 goto nla_put_failure;
1155
1156         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1157                 if (rtnl_link_fill(skb, dev) < 0)
1158                         goto nla_put_failure;
1159         }
1160
1161         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1162                 goto nla_put_failure;
1163
1164         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1165                 if (af_ops->fill_link_af) {
1166                         struct nlattr *af;
1167                         int err;
1168
1169                         if (!(af = nla_nest_start(skb, af_ops->family)))
1170                                 goto nla_put_failure;
1171
1172                         err = af_ops->fill_link_af(skb, dev);
1173
1174                         /*
1175                          * Caller may return ENODATA to indicate that there
1176                          * was no data to be dumped. This is not an error, it
1177                          * means we should trim the attribute header and
1178                          * continue.
1179                          */
1180                         if (err == -ENODATA)
1181                                 nla_nest_cancel(skb, af);
1182                         else if (err < 0)
1183                                 goto nla_put_failure;
1184
1185                         nla_nest_end(skb, af);
1186                 }
1187         }
1188
1189         nla_nest_end(skb, af_spec);
1190
1191         return nlmsg_end(skb, nlh);
1192
1193 nla_put_failure:
1194         nlmsg_cancel(skb, nlh);
1195         return -EMSGSIZE;
1196 }
1197
1198 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1199         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1200         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1201         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1202         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1203         [IFLA_MTU]              = { .type = NLA_U32 },
1204         [IFLA_LINK]             = { .type = NLA_U32 },
1205         [IFLA_MASTER]           = { .type = NLA_U32 },
1206         [IFLA_CARRIER]          = { .type = NLA_U8 },
1207         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1208         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1209         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1210         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1211         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1212         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1213         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1214         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1215         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1216         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1217         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1218         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1219         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1220         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1221         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1222         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1223         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1224         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1225         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1226 };
1227
1228 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1229         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1230         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1231         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1232         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1233 };
1234
1235 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1236         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1237 };
1238
1239 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1240         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1241                                     .len = sizeof(struct ifla_vf_mac) },
1242         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1243                                     .len = sizeof(struct ifla_vf_vlan) },
1244         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1245                                     .len = sizeof(struct ifla_vf_tx_rate) },
1246         [IFLA_VF_SPOOFCHK]      = { .type = NLA_BINARY,
1247                                     .len = sizeof(struct ifla_vf_spoofchk) },
1248         [IFLA_VF_RATE]          = { .type = NLA_BINARY,
1249                                     .len = sizeof(struct ifla_vf_rate) },
1250         [IFLA_VF_LINK_STATE]    = { .type = NLA_BINARY,
1251                                     .len = sizeof(struct ifla_vf_link_state) },
1252 };
1253
1254 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1255         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1256         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1257                                     .len = PORT_PROFILE_MAX },
1258         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1259                                     .len = sizeof(struct ifla_port_vsi)},
1260         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1261                                       .len = PORT_UUID_MAX },
1262         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1263                                     .len = PORT_UUID_MAX },
1264         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1265         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1266 };
1267
1268 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1269 {
1270         struct net *net = sock_net(skb->sk);
1271         int h, s_h;
1272         int idx = 0, s_idx;
1273         struct net_device *dev;
1274         struct hlist_head *head;
1275         struct nlattr *tb[IFLA_MAX+1];
1276         u32 ext_filter_mask = 0;
1277         int err;
1278         int hdrlen;
1279
1280         s_h = cb->args[0];
1281         s_idx = cb->args[1];
1282
1283         rcu_read_lock();
1284         cb->seq = net->dev_base_seq;
1285
1286         /* A hack to preserve kernel<->userspace interface.
1287          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1288          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1289          * what iproute2 < v3.9.0 used.
1290          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1291          * attribute, its netlink message is shorter than struct ifinfomsg.
1292          */
1293         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1294                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1295
1296         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1297
1298                 if (tb[IFLA_EXT_MASK])
1299                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1300         }
1301
1302         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1303                 idx = 0;
1304                 head = &net->dev_index_head[h];
1305                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1306                         if (idx < s_idx)
1307                                 goto cont;
1308                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1309                                                NETLINK_CB(cb->skb).portid,
1310                                                cb->nlh->nlmsg_seq, 0,
1311                                                NLM_F_MULTI,
1312                                                ext_filter_mask);
1313                         /* If we ran out of room on the first message,
1314                          * we're in trouble
1315                          */
1316                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1317
1318                         if (err <= 0)
1319                                 goto out;
1320
1321                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1322 cont:
1323                         idx++;
1324                 }
1325         }
1326 out:
1327         rcu_read_unlock();
1328         cb->args[1] = idx;
1329         cb->args[0] = h;
1330
1331         return skb->len;
1332 }
1333
1334 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1335 {
1336         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1337 }
1338 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1339
1340 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1341 {
1342         struct net *net;
1343         /* Examine the link attributes and figure out which
1344          * network namespace we are talking about.
1345          */
1346         if (tb[IFLA_NET_NS_PID])
1347                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1348         else if (tb[IFLA_NET_NS_FD])
1349                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1350         else
1351                 net = get_net(src_net);
1352         return net;
1353 }
1354 EXPORT_SYMBOL(rtnl_link_get_net);
1355
1356 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1357 {
1358         if (dev) {
1359                 if (tb[IFLA_ADDRESS] &&
1360                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1361                         return -EINVAL;
1362
1363                 if (tb[IFLA_BROADCAST] &&
1364                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1365                         return -EINVAL;
1366         }
1367
1368         if (tb[IFLA_AF_SPEC]) {
1369                 struct nlattr *af;
1370                 int rem, err;
1371
1372                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1373                         const struct rtnl_af_ops *af_ops;
1374
1375                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1376                                 return -EAFNOSUPPORT;
1377
1378                         if (!af_ops->set_link_af)
1379                                 return -EOPNOTSUPP;
1380
1381                         if (af_ops->validate_link_af) {
1382                                 err = af_ops->validate_link_af(dev, af);
1383                                 if (err < 0)
1384                                         return err;
1385                         }
1386                 }
1387         }
1388
1389         return 0;
1390 }
1391
1392 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1393 {
1394         int rem, err = -EINVAL;
1395         struct nlattr *vf;
1396         const struct net_device_ops *ops = dev->netdev_ops;
1397
1398         nla_for_each_nested(vf, attr, rem) {
1399                 switch (nla_type(vf)) {
1400                 case IFLA_VF_MAC: {
1401                         struct ifla_vf_mac *ivm;
1402                         ivm = nla_data(vf);
1403                         err = -EOPNOTSUPP;
1404                         if (ops->ndo_set_vf_mac)
1405                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1406                                                           ivm->mac);
1407                         break;
1408                 }
1409                 case IFLA_VF_VLAN: {
1410                         struct ifla_vf_vlan *ivv;
1411                         ivv = nla_data(vf);
1412                         err = -EOPNOTSUPP;
1413                         if (ops->ndo_set_vf_vlan)
1414                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1415                                                            ivv->vlan,
1416                                                            ivv->qos);
1417                         break;
1418                 }
1419                 case IFLA_VF_TX_RATE: {
1420                         struct ifla_vf_tx_rate *ivt;
1421                         struct ifla_vf_info ivf;
1422                         ivt = nla_data(vf);
1423                         err = -EOPNOTSUPP;
1424                         if (ops->ndo_get_vf_config)
1425                                 err = ops->ndo_get_vf_config(dev, ivt->vf,
1426                                                              &ivf);
1427                         if (err)
1428                                 break;
1429                         err = -EOPNOTSUPP;
1430                         if (ops->ndo_set_vf_rate)
1431                                 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1432                                                            ivf.min_tx_rate,
1433                                                            ivt->rate);
1434                         break;
1435                 }
1436                 case IFLA_VF_RATE: {
1437                         struct ifla_vf_rate *ivt;
1438                         ivt = nla_data(vf);
1439                         err = -EOPNOTSUPP;
1440                         if (ops->ndo_set_vf_rate)
1441                                 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1442                                                            ivt->min_tx_rate,
1443                                                            ivt->max_tx_rate);
1444                         break;
1445                 }
1446                 case IFLA_VF_SPOOFCHK: {
1447                         struct ifla_vf_spoofchk *ivs;
1448                         ivs = nla_data(vf);
1449                         err = -EOPNOTSUPP;
1450                         if (ops->ndo_set_vf_spoofchk)
1451                                 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1452                                                                ivs->setting);
1453                         break;
1454                 }
1455                 case IFLA_VF_LINK_STATE: {
1456                         struct ifla_vf_link_state *ivl;
1457                         ivl = nla_data(vf);
1458                         err = -EOPNOTSUPP;
1459                         if (ops->ndo_set_vf_link_state)
1460                                 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1461                                                                  ivl->link_state);
1462                         break;
1463                 }
1464                 default:
1465                         err = -EINVAL;
1466                         break;
1467                 }
1468                 if (err)
1469                         break;
1470         }
1471         return err;
1472 }
1473
1474 static int do_set_master(struct net_device *dev, int ifindex)
1475 {
1476         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1477         const struct net_device_ops *ops;
1478         int err;
1479
1480         if (upper_dev) {
1481                 if (upper_dev->ifindex == ifindex)
1482                         return 0;
1483                 ops = upper_dev->netdev_ops;
1484                 if (ops->ndo_del_slave) {
1485                         err = ops->ndo_del_slave(upper_dev, dev);
1486                         if (err)
1487                                 return err;
1488                 } else {
1489                         return -EOPNOTSUPP;
1490                 }
1491         }
1492
1493         if (ifindex) {
1494                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1495                 if (!upper_dev)
1496                         return -EINVAL;
1497                 ops = upper_dev->netdev_ops;
1498                 if (ops->ndo_add_slave) {
1499                         err = ops->ndo_add_slave(upper_dev, dev);
1500                         if (err)
1501                                 return err;
1502                 } else {
1503                         return -EOPNOTSUPP;
1504                 }
1505         }
1506         return 0;
1507 }
1508
1509 #define DO_SETLINK_MODIFIED     0x01
1510 /* notify flag means notify + modified. */
1511 #define DO_SETLINK_NOTIFY       0x03
1512 static int do_setlink(const struct sk_buff *skb,
1513                       struct net_device *dev, struct ifinfomsg *ifm,
1514                       struct nlattr **tb, char *ifname, int status)
1515 {
1516         const struct net_device_ops *ops = dev->netdev_ops;
1517         int err;
1518
1519         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1520                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1521                 if (IS_ERR(net)) {
1522                         err = PTR_ERR(net);
1523                         goto errout;
1524                 }
1525                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1526                         put_net(net);
1527                         err = -EPERM;
1528                         goto errout;
1529                 }
1530                 err = dev_change_net_namespace(dev, net, ifname);
1531                 put_net(net);
1532                 if (err)
1533                         goto errout;
1534                 status |= DO_SETLINK_MODIFIED;
1535         }
1536
1537         if (tb[IFLA_MAP]) {
1538                 struct rtnl_link_ifmap *u_map;
1539                 struct ifmap k_map;
1540
1541                 if (!ops->ndo_set_config) {
1542                         err = -EOPNOTSUPP;
1543                         goto errout;
1544                 }
1545
1546                 if (!netif_device_present(dev)) {
1547                         err = -ENODEV;
1548                         goto errout;
1549                 }
1550
1551                 u_map = nla_data(tb[IFLA_MAP]);
1552                 k_map.mem_start = (unsigned long) u_map->mem_start;
1553                 k_map.mem_end = (unsigned long) u_map->mem_end;
1554                 k_map.base_addr = (unsigned short) u_map->base_addr;
1555                 k_map.irq = (unsigned char) u_map->irq;
1556                 k_map.dma = (unsigned char) u_map->dma;
1557                 k_map.port = (unsigned char) u_map->port;
1558
1559                 err = ops->ndo_set_config(dev, &k_map);
1560                 if (err < 0)
1561                         goto errout;
1562
1563                 status |= DO_SETLINK_NOTIFY;
1564         }
1565
1566         if (tb[IFLA_ADDRESS]) {
1567                 struct sockaddr *sa;
1568                 int len;
1569
1570                 len = sizeof(sa_family_t) + dev->addr_len;
1571                 sa = kmalloc(len, GFP_KERNEL);
1572                 if (!sa) {
1573                         err = -ENOMEM;
1574                         goto errout;
1575                 }
1576                 sa->sa_family = dev->type;
1577                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1578                        dev->addr_len);
1579                 err = dev_set_mac_address(dev, sa);
1580                 kfree(sa);
1581                 if (err)
1582                         goto errout;
1583                 status |= DO_SETLINK_MODIFIED;
1584         }
1585
1586         if (tb[IFLA_MTU]) {
1587                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1588                 if (err < 0)
1589                         goto errout;
1590                 status |= DO_SETLINK_MODIFIED;
1591         }
1592
1593         if (tb[IFLA_GROUP]) {
1594                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1595                 status |= DO_SETLINK_NOTIFY;
1596         }
1597
1598         /*
1599          * Interface selected by interface index but interface
1600          * name provided implies that a name change has been
1601          * requested.
1602          */
1603         if (ifm->ifi_index > 0 && ifname[0]) {
1604                 err = dev_change_name(dev, ifname);
1605                 if (err < 0)
1606                         goto errout;
1607                 status |= DO_SETLINK_MODIFIED;
1608         }
1609
1610         if (tb[IFLA_IFALIAS]) {
1611                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1612                                     nla_len(tb[IFLA_IFALIAS]));
1613                 if (err < 0)
1614                         goto errout;
1615                 status |= DO_SETLINK_NOTIFY;
1616         }
1617
1618         if (tb[IFLA_BROADCAST]) {
1619                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1620                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1621         }
1622
1623         if (ifm->ifi_flags || ifm->ifi_change) {
1624                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1625                 if (err < 0)
1626                         goto errout;
1627         }
1628
1629         if (tb[IFLA_MASTER]) {
1630                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1631                 if (err)
1632                         goto errout;
1633                 status |= DO_SETLINK_MODIFIED;
1634         }
1635
1636         if (tb[IFLA_CARRIER]) {
1637                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1638                 if (err)
1639                         goto errout;
1640                 status |= DO_SETLINK_MODIFIED;
1641         }
1642
1643         if (tb[IFLA_TXQLEN]) {
1644                 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1645
1646                 if (dev->tx_queue_len ^ value)
1647                         status |= DO_SETLINK_NOTIFY;
1648
1649                 dev->tx_queue_len = value;
1650         }
1651
1652         if (tb[IFLA_OPERSTATE])
1653                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1654
1655         if (tb[IFLA_LINKMODE]) {
1656                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1657
1658                 write_lock_bh(&dev_base_lock);
1659                 if (dev->link_mode ^ value)
1660                         status |= DO_SETLINK_NOTIFY;
1661                 dev->link_mode = value;
1662                 write_unlock_bh(&dev_base_lock);
1663         }
1664
1665         if (tb[IFLA_VFINFO_LIST]) {
1666                 struct nlattr *attr;
1667                 int rem;
1668                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1669                         if (nla_type(attr) != IFLA_VF_INFO) {
1670                                 err = -EINVAL;
1671                                 goto errout;
1672                         }
1673                         err = do_setvfinfo(dev, attr);
1674                         if (err < 0)
1675                                 goto errout;
1676                         status |= DO_SETLINK_NOTIFY;
1677                 }
1678         }
1679         err = 0;
1680
1681         if (tb[IFLA_VF_PORTS]) {
1682                 struct nlattr *port[IFLA_PORT_MAX+1];
1683                 struct nlattr *attr;
1684                 int vf;
1685                 int rem;
1686
1687                 err = -EOPNOTSUPP;
1688                 if (!ops->ndo_set_vf_port)
1689                         goto errout;
1690
1691                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1692                         if (nla_type(attr) != IFLA_VF_PORT)
1693                                 continue;
1694                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1695                                 attr, ifla_port_policy);
1696                         if (err < 0)
1697                                 goto errout;
1698                         if (!port[IFLA_PORT_VF]) {
1699                                 err = -EOPNOTSUPP;
1700                                 goto errout;
1701                         }
1702                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1703                         err = ops->ndo_set_vf_port(dev, vf, port);
1704                         if (err < 0)
1705                                 goto errout;
1706                         status |= DO_SETLINK_NOTIFY;
1707                 }
1708         }
1709         err = 0;
1710
1711         if (tb[IFLA_PORT_SELF]) {
1712                 struct nlattr *port[IFLA_PORT_MAX+1];
1713
1714                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1715                         tb[IFLA_PORT_SELF], ifla_port_policy);
1716                 if (err < 0)
1717                         goto errout;
1718
1719                 err = -EOPNOTSUPP;
1720                 if (ops->ndo_set_vf_port)
1721                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1722                 if (err < 0)
1723                         goto errout;
1724                 status |= DO_SETLINK_NOTIFY;
1725         }
1726
1727         if (tb[IFLA_AF_SPEC]) {
1728                 struct nlattr *af;
1729                 int rem;
1730
1731                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1732                         const struct rtnl_af_ops *af_ops;
1733
1734                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1735                                 BUG();
1736
1737                         err = af_ops->set_link_af(dev, af);
1738                         if (err < 0)
1739                                 goto errout;
1740
1741                         status |= DO_SETLINK_NOTIFY;
1742                 }
1743         }
1744         err = 0;
1745
1746 errout:
1747         if (status & DO_SETLINK_MODIFIED) {
1748                 if (status & DO_SETLINK_NOTIFY)
1749                         netdev_state_change(dev);
1750
1751                 if (err < 0)
1752                         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",
1753                                              dev->name);
1754         }
1755
1756         return err;
1757 }
1758
1759 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1760 {
1761         struct net *net = sock_net(skb->sk);
1762         struct ifinfomsg *ifm;
1763         struct net_device *dev;
1764         int err;
1765         struct nlattr *tb[IFLA_MAX+1];
1766         char ifname[IFNAMSIZ];
1767
1768         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1769         if (err < 0)
1770                 goto errout;
1771
1772         if (tb[IFLA_IFNAME])
1773                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1774         else
1775                 ifname[0] = '\0';
1776
1777         err = -EINVAL;
1778         ifm = nlmsg_data(nlh);
1779         if (ifm->ifi_index > 0)
1780                 dev = __dev_get_by_index(net, ifm->ifi_index);
1781         else if (tb[IFLA_IFNAME])
1782                 dev = __dev_get_by_name(net, ifname);
1783         else
1784                 goto errout;
1785
1786         if (dev == NULL) {
1787                 err = -ENODEV;
1788                 goto errout;
1789         }
1790
1791         err = validate_linkmsg(dev, tb);
1792         if (err < 0)
1793                 goto errout;
1794
1795         err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1796 errout:
1797         return err;
1798 }
1799
1800 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1801 {
1802         struct net *net = sock_net(skb->sk);
1803         const struct rtnl_link_ops *ops;
1804         struct net_device *dev;
1805         struct ifinfomsg *ifm;
1806         char ifname[IFNAMSIZ];
1807         struct nlattr *tb[IFLA_MAX+1];
1808         int err;
1809         LIST_HEAD(list_kill);
1810
1811         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1812         if (err < 0)
1813                 return err;
1814
1815         if (tb[IFLA_IFNAME])
1816                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1817
1818         ifm = nlmsg_data(nlh);
1819         if (ifm->ifi_index > 0)
1820                 dev = __dev_get_by_index(net, ifm->ifi_index);
1821         else if (tb[IFLA_IFNAME])
1822                 dev = __dev_get_by_name(net, ifname);
1823         else
1824                 return -EINVAL;
1825
1826         if (!dev)
1827                 return -ENODEV;
1828
1829         ops = dev->rtnl_link_ops;
1830         if (!ops || !ops->dellink)
1831                 return -EOPNOTSUPP;
1832
1833         ops->dellink(dev, &list_kill);
1834         unregister_netdevice_many(&list_kill);
1835         return 0;
1836 }
1837
1838 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1839 {
1840         unsigned int old_flags;
1841         int err;
1842
1843         old_flags = dev->flags;
1844         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1845                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1846                 if (err < 0)
1847                         return err;
1848         }
1849
1850         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1851
1852         __dev_notify_flags(dev, old_flags, ~0U);
1853         return 0;
1854 }
1855 EXPORT_SYMBOL(rtnl_configure_link);
1856
1857 struct net_device *rtnl_create_link(struct net *net,
1858         char *ifname, unsigned char name_assign_type,
1859         const struct rtnl_link_ops *ops, struct nlattr *tb[])
1860 {
1861         int err;
1862         struct net_device *dev;
1863         unsigned int num_tx_queues = 1;
1864         unsigned int num_rx_queues = 1;
1865
1866         if (tb[IFLA_NUM_TX_QUEUES])
1867                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1868         else if (ops->get_num_tx_queues)
1869                 num_tx_queues = ops->get_num_tx_queues();
1870
1871         if (tb[IFLA_NUM_RX_QUEUES])
1872                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1873         else if (ops->get_num_rx_queues)
1874                 num_rx_queues = ops->get_num_rx_queues();
1875
1876         err = -ENOMEM;
1877         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
1878                                ops->setup, num_tx_queues, num_rx_queues);
1879         if (!dev)
1880                 goto err;
1881
1882         dev_net_set(dev, net);
1883         dev->rtnl_link_ops = ops;
1884         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1885
1886         if (tb[IFLA_MTU])
1887                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1888         if (tb[IFLA_ADDRESS]) {
1889                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1890                                 nla_len(tb[IFLA_ADDRESS]));
1891                 dev->addr_assign_type = NET_ADDR_SET;
1892         }
1893         if (tb[IFLA_BROADCAST])
1894                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1895                                 nla_len(tb[IFLA_BROADCAST]));
1896         if (tb[IFLA_TXQLEN])
1897                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1898         if (tb[IFLA_OPERSTATE])
1899                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1900         if (tb[IFLA_LINKMODE])
1901                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1902         if (tb[IFLA_GROUP])
1903                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1904
1905         return dev;
1906
1907 err:
1908         return ERR_PTR(err);
1909 }
1910 EXPORT_SYMBOL(rtnl_create_link);
1911
1912 static int rtnl_group_changelink(const struct sk_buff *skb,
1913                 struct net *net, int group,
1914                 struct ifinfomsg *ifm,
1915                 struct nlattr **tb)
1916 {
1917         struct net_device *dev;
1918         int err;
1919
1920         for_each_netdev(net, dev) {
1921                 if (dev->group == group) {
1922                         err = do_setlink(skb, dev, ifm, tb, NULL, 0);
1923                         if (err < 0)
1924                                 return err;
1925                 }
1926         }
1927
1928         return 0;
1929 }
1930
1931 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1932 {
1933         struct net *net = sock_net(skb->sk);
1934         const struct rtnl_link_ops *ops;
1935         const struct rtnl_link_ops *m_ops = NULL;
1936         struct net_device *dev;
1937         struct net_device *master_dev = NULL;
1938         struct ifinfomsg *ifm;
1939         char kind[MODULE_NAME_LEN];
1940         char ifname[IFNAMSIZ];
1941         struct nlattr *tb[IFLA_MAX+1];
1942         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1943         unsigned char name_assign_type = NET_NAME_USER;
1944         int err;
1945
1946 #ifdef CONFIG_MODULES
1947 replay:
1948 #endif
1949         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1950         if (err < 0)
1951                 return err;
1952
1953         if (tb[IFLA_IFNAME])
1954                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1955         else
1956                 ifname[0] = '\0';
1957
1958         ifm = nlmsg_data(nlh);
1959         if (ifm->ifi_index > 0)
1960                 dev = __dev_get_by_index(net, ifm->ifi_index);
1961         else {
1962                 if (ifname[0])
1963                         dev = __dev_get_by_name(net, ifname);
1964                 else
1965                         dev = NULL;
1966         }
1967
1968         if (dev) {
1969                 master_dev = netdev_master_upper_dev_get(dev);
1970                 if (master_dev)
1971                         m_ops = master_dev->rtnl_link_ops;
1972         }
1973
1974         err = validate_linkmsg(dev, tb);
1975         if (err < 0)
1976                 return err;
1977
1978         if (tb[IFLA_LINKINFO]) {
1979                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1980                                        tb[IFLA_LINKINFO], ifla_info_policy);
1981                 if (err < 0)
1982                         return err;
1983         } else
1984                 memset(linkinfo, 0, sizeof(linkinfo));
1985
1986         if (linkinfo[IFLA_INFO_KIND]) {
1987                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1988                 ops = rtnl_link_ops_get(kind);
1989         } else {
1990                 kind[0] = '\0';
1991                 ops = NULL;
1992         }
1993
1994         if (1) {
1995                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0];
1996                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 0];
1997                 struct nlattr **data = NULL;
1998                 struct nlattr **slave_data = NULL;
1999                 struct net *dest_net;
2000
2001                 if (ops) {
2002                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2003                                 err = nla_parse_nested(attr, ops->maxtype,
2004                                                        linkinfo[IFLA_INFO_DATA],
2005                                                        ops->policy);
2006                                 if (err < 0)
2007                                         return err;
2008                                 data = attr;
2009                         }
2010                         if (ops->validate) {
2011                                 err = ops->validate(tb, data);
2012                                 if (err < 0)
2013                                         return err;
2014                         }
2015                 }
2016
2017                 if (m_ops) {
2018                         if (m_ops->slave_maxtype &&
2019                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2020                                 err = nla_parse_nested(slave_attr,
2021                                                        m_ops->slave_maxtype,
2022                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2023                                                        m_ops->slave_policy);
2024                                 if (err < 0)
2025                                         return err;
2026                                 slave_data = slave_attr;
2027                         }
2028                         if (m_ops->slave_validate) {
2029                                 err = m_ops->slave_validate(tb, slave_data);
2030                                 if (err < 0)
2031                                         return err;
2032                         }
2033                 }
2034
2035                 if (dev) {
2036                         int status = 0;
2037
2038                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2039                                 return -EEXIST;
2040                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2041                                 return -EOPNOTSUPP;
2042
2043                         if (linkinfo[IFLA_INFO_DATA]) {
2044                                 if (!ops || ops != dev->rtnl_link_ops ||
2045                                     !ops->changelink)
2046                                         return -EOPNOTSUPP;
2047
2048                                 err = ops->changelink(dev, tb, data);
2049                                 if (err < 0)
2050                                         return err;
2051                                 status |= DO_SETLINK_NOTIFY;
2052                         }
2053
2054                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2055                                 if (!m_ops || !m_ops->slave_changelink)
2056                                         return -EOPNOTSUPP;
2057
2058                                 err = m_ops->slave_changelink(master_dev, dev,
2059                                                               tb, slave_data);
2060                                 if (err < 0)
2061                                         return err;
2062                                 status |= DO_SETLINK_NOTIFY;
2063                         }
2064
2065                         return do_setlink(skb, dev, ifm, tb, ifname, status);
2066                 }
2067
2068                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2069                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2070                                 return rtnl_group_changelink(skb, net,
2071                                                 nla_get_u32(tb[IFLA_GROUP]),
2072                                                 ifm, tb);
2073                         return -ENODEV;
2074                 }
2075
2076                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2077                         return -EOPNOTSUPP;
2078
2079                 if (!ops) {
2080 #ifdef CONFIG_MODULES
2081                         if (kind[0]) {
2082                                 __rtnl_unlock();
2083                                 request_module("rtnl-link-%s", kind);
2084                                 rtnl_lock();
2085                                 ops = rtnl_link_ops_get(kind);
2086                                 if (ops)
2087                                         goto replay;
2088                         }
2089 #endif
2090                         return -EOPNOTSUPP;
2091                 }
2092
2093                 if (!ops->setup)
2094                         return -EOPNOTSUPP;
2095
2096                 if (!ifname[0]) {
2097                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2098                         name_assign_type = NET_NAME_ENUM;
2099                 }
2100
2101                 dest_net = rtnl_link_get_net(net, tb);
2102                 if (IS_ERR(dest_net))
2103                         return PTR_ERR(dest_net);
2104
2105                 dev = rtnl_create_link(dest_net, ifname, name_assign_type, ops, tb);
2106                 if (IS_ERR(dev)) {
2107                         err = PTR_ERR(dev);
2108                         goto out;
2109                 }
2110
2111                 dev->ifindex = ifm->ifi_index;
2112
2113                 if (ops->newlink) {
2114                         err = ops->newlink(net, dev, tb, data);
2115                         /* Drivers should call free_netdev() in ->destructor
2116                          * and unregister it on failure after registration
2117                          * so that device could be finally freed in rtnl_unlock.
2118                          */
2119                         if (err < 0) {
2120                                 /* If device is not registered at all, free it now */
2121                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2122                                         free_netdev(dev);
2123                                 goto out;
2124                         }
2125                 } else {
2126                         err = register_netdevice(dev);
2127                         if (err < 0) {
2128                                 free_netdev(dev);
2129                                 goto out;
2130                         }
2131                 }
2132                 err = rtnl_configure_link(dev, ifm);
2133                 if (err < 0)
2134                         unregister_netdevice(dev);
2135 out:
2136                 put_net(dest_net);
2137                 return err;
2138         }
2139 }
2140
2141 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2142 {
2143         struct net *net = sock_net(skb->sk);
2144         struct ifinfomsg *ifm;
2145         char ifname[IFNAMSIZ];
2146         struct nlattr *tb[IFLA_MAX+1];
2147         struct net_device *dev = NULL;
2148         struct sk_buff *nskb;
2149         int err;
2150         u32 ext_filter_mask = 0;
2151
2152         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2153         if (err < 0)
2154                 return err;
2155
2156         if (tb[IFLA_IFNAME])
2157                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2158
2159         if (tb[IFLA_EXT_MASK])
2160                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2161
2162         ifm = nlmsg_data(nlh);
2163         if (ifm->ifi_index > 0)
2164                 dev = __dev_get_by_index(net, ifm->ifi_index);
2165         else if (tb[IFLA_IFNAME])
2166                 dev = __dev_get_by_name(net, ifname);
2167         else
2168                 return -EINVAL;
2169
2170         if (dev == NULL)
2171                 return -ENODEV;
2172
2173         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2174         if (nskb == NULL)
2175                 return -ENOBUFS;
2176
2177         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2178                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2179         if (err < 0) {
2180                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2181                 WARN_ON(err == -EMSGSIZE);
2182                 kfree_skb(nskb);
2183         } else
2184                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2185
2186         return err;
2187 }
2188
2189 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2190 {
2191         struct net *net = sock_net(skb->sk);
2192         struct net_device *dev;
2193         struct nlattr *tb[IFLA_MAX+1];
2194         u32 ext_filter_mask = 0;
2195         u16 min_ifinfo_dump_size = 0;
2196         int hdrlen;
2197
2198         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2199         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2200                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2201
2202         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2203                 if (tb[IFLA_EXT_MASK])
2204                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2205         }
2206
2207         if (!ext_filter_mask)
2208                 return NLMSG_GOODSIZE;
2209         /*
2210          * traverse the list of net devices and compute the minimum
2211          * buffer size based upon the filter mask.
2212          */
2213         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2214                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2215                                              if_nlmsg_size(dev,
2216                                                            ext_filter_mask));
2217         }
2218
2219         return min_ifinfo_dump_size;
2220 }
2221
2222 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2223 {
2224         int idx;
2225         int s_idx = cb->family;
2226
2227         if (s_idx == 0)
2228                 s_idx = 1;
2229         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2230                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2231                 if (idx < s_idx || idx == PF_PACKET)
2232                         continue;
2233                 if (rtnl_msg_handlers[idx] == NULL ||
2234                     rtnl_msg_handlers[idx][type].dumpit == NULL)
2235                         continue;
2236                 if (idx > s_idx) {
2237                         memset(&cb->args[0], 0, sizeof(cb->args));
2238                         cb->prev_seq = 0;
2239                         cb->seq = 0;
2240                 }
2241                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2242                         break;
2243         }
2244         cb->family = idx;
2245
2246         return skb->len;
2247 }
2248
2249 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2250                                        unsigned int change, gfp_t flags)
2251 {
2252         struct net *net = dev_net(dev);
2253         struct sk_buff *skb;
2254         int err = -ENOBUFS;
2255         size_t if_info_size;
2256
2257         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2258         if (skb == NULL)
2259                 goto errout;
2260
2261         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2262         if (err < 0) {
2263                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2264                 WARN_ON(err == -EMSGSIZE);
2265                 kfree_skb(skb);
2266                 goto errout;
2267         }
2268         return skb;
2269 errout:
2270         if (err < 0)
2271                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2272         return NULL;
2273 }
2274
2275 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2276 {
2277         struct net *net = dev_net(dev);
2278
2279         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2280 }
2281
2282 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2283                   gfp_t flags)
2284 {
2285         struct sk_buff *skb;
2286
2287         skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2288         if (skb)
2289                 rtmsg_ifinfo_send(skb, dev, flags);
2290 }
2291 EXPORT_SYMBOL(rtmsg_ifinfo);
2292
2293 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2294                                    struct net_device *dev,
2295                                    u8 *addr, u32 pid, u32 seq,
2296                                    int type, unsigned int flags,
2297                                    int nlflags)
2298 {
2299         struct nlmsghdr *nlh;
2300         struct ndmsg *ndm;
2301
2302         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2303         if (!nlh)
2304                 return -EMSGSIZE;
2305
2306         ndm = nlmsg_data(nlh);
2307         ndm->ndm_family  = AF_BRIDGE;
2308         ndm->ndm_pad1    = 0;
2309         ndm->ndm_pad2    = 0;
2310         ndm->ndm_flags   = flags;
2311         ndm->ndm_type    = 0;
2312         ndm->ndm_ifindex = dev->ifindex;
2313         ndm->ndm_state   = NUD_PERMANENT;
2314
2315         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2316                 goto nla_put_failure;
2317
2318         return nlmsg_end(skb, nlh);
2319
2320 nla_put_failure:
2321         nlmsg_cancel(skb, nlh);
2322         return -EMSGSIZE;
2323 }
2324
2325 static inline size_t rtnl_fdb_nlmsg_size(void)
2326 {
2327         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2328 }
2329
2330 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2331 {
2332         struct net *net = dev_net(dev);
2333         struct sk_buff *skb;
2334         int err = -ENOBUFS;
2335
2336         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2337         if (!skb)
2338                 goto errout;
2339
2340         err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0);
2341         if (err < 0) {
2342                 kfree_skb(skb);
2343                 goto errout;
2344         }
2345
2346         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2347         return;
2348 errout:
2349         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2350 }
2351
2352 /**
2353  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2354  */
2355 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2356                      struct nlattr *tb[],
2357                      struct net_device *dev,
2358                      const unsigned char *addr, u16 vid,
2359                      u16 flags)
2360 {
2361         int err = -EINVAL;
2362
2363         /* If aging addresses are supported device will need to
2364          * implement its own handler for this.
2365          */
2366         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2367                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2368                 return err;
2369         }
2370
2371         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2372                 err = dev_uc_add_excl(dev, addr);
2373         else if (is_multicast_ether_addr(addr))
2374                 err = dev_mc_add_excl(dev, addr);
2375
2376         /* Only return duplicate errors if NLM_F_EXCL is set */
2377         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2378                 err = 0;
2379
2380         return err;
2381 }
2382 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2383
2384 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2385 {
2386         u16 vid = 0;
2387
2388         if (vlan_attr) {
2389                 if (nla_len(vlan_attr) != sizeof(u16)) {
2390                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2391                         return -EINVAL;
2392                 }
2393
2394                 vid = nla_get_u16(vlan_attr);
2395
2396                 if (!vid || vid >= VLAN_VID_MASK) {
2397                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2398                                 vid);
2399                         return -EINVAL;
2400                 }
2401         }
2402         *p_vid = vid;
2403         return 0;
2404 }
2405
2406 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2407 {
2408         struct net *net = sock_net(skb->sk);
2409         struct ndmsg *ndm;
2410         struct nlattr *tb[NDA_MAX+1];
2411         struct net_device *dev;
2412         u8 *addr;
2413         u16 vid;
2414         int err;
2415
2416         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2417         if (err < 0)
2418                 return err;
2419
2420         ndm = nlmsg_data(nlh);
2421         if (ndm->ndm_ifindex == 0) {
2422                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2423                 return -EINVAL;
2424         }
2425
2426         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2427         if (dev == NULL) {
2428                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2429                 return -ENODEV;
2430         }
2431
2432         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2433                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2434                 return -EINVAL;
2435         }
2436
2437         addr = nla_data(tb[NDA_LLADDR]);
2438
2439         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2440         if (err)
2441                 return err;
2442
2443         err = -EOPNOTSUPP;
2444
2445         /* Support fdb on master device the net/bridge default case */
2446         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2447             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2448                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2449                 const struct net_device_ops *ops = br_dev->netdev_ops;
2450
2451                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2452                                        nlh->nlmsg_flags);
2453                 if (err)
2454                         goto out;
2455                 else
2456                         ndm->ndm_flags &= ~NTF_MASTER;
2457         }
2458
2459         /* Embedded bridge, macvlan, and any other device support */
2460         if ((ndm->ndm_flags & NTF_SELF)) {
2461                 if (dev->netdev_ops->ndo_fdb_add)
2462                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2463                                                            vid,
2464                                                            nlh->nlmsg_flags);
2465                 else
2466                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2467                                                nlh->nlmsg_flags);
2468
2469                 if (!err) {
2470                         rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2471                         ndm->ndm_flags &= ~NTF_SELF;
2472                 }
2473         }
2474 out:
2475         return err;
2476 }
2477
2478 /**
2479  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2480  */
2481 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2482                      struct nlattr *tb[],
2483                      struct net_device *dev,
2484                      const unsigned char *addr, u16 vid)
2485 {
2486         int err = -EINVAL;
2487
2488         /* If aging addresses are supported device will need to
2489          * implement its own handler for this.
2490          */
2491         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2492                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2493                 return err;
2494         }
2495
2496         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2497                 err = dev_uc_del(dev, addr);
2498         else if (is_multicast_ether_addr(addr))
2499                 err = dev_mc_del(dev, addr);
2500
2501         return err;
2502 }
2503 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2504
2505 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2506 {
2507         struct net *net = sock_net(skb->sk);
2508         struct ndmsg *ndm;
2509         struct nlattr *tb[NDA_MAX+1];
2510         struct net_device *dev;
2511         int err = -EINVAL;
2512         __u8 *addr;
2513         u16 vid;
2514
2515         if (!netlink_capable(skb, CAP_NET_ADMIN))
2516                 return -EPERM;
2517
2518         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2519         if (err < 0)
2520                 return err;
2521
2522         ndm = nlmsg_data(nlh);
2523         if (ndm->ndm_ifindex == 0) {
2524                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2525                 return -EINVAL;
2526         }
2527
2528         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2529         if (dev == NULL) {
2530                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2531                 return -ENODEV;
2532         }
2533
2534         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2535                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2536                 return -EINVAL;
2537         }
2538
2539         addr = nla_data(tb[NDA_LLADDR]);
2540
2541         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2542         if (err)
2543                 return err;
2544
2545         err = -EOPNOTSUPP;
2546
2547         /* Support fdb on master device the net/bridge default case */
2548         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2549             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2550                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2551                 const struct net_device_ops *ops = br_dev->netdev_ops;
2552
2553                 if (ops->ndo_fdb_del)
2554                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
2555
2556                 if (err)
2557                         goto out;
2558                 else
2559                         ndm->ndm_flags &= ~NTF_MASTER;
2560         }
2561
2562         /* Embedded bridge, macvlan, and any other device support */
2563         if (ndm->ndm_flags & NTF_SELF) {
2564                 if (dev->netdev_ops->ndo_fdb_del)
2565                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
2566                                                            vid);
2567                 else
2568                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
2569
2570                 if (!err) {
2571                         rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2572                         ndm->ndm_flags &= ~NTF_SELF;
2573                 }
2574         }
2575 out:
2576         return err;
2577 }
2578
2579 static int nlmsg_populate_fdb(struct sk_buff *skb,
2580                               struct netlink_callback *cb,
2581                               struct net_device *dev,
2582                               int *idx,
2583                               struct netdev_hw_addr_list *list)
2584 {
2585         struct netdev_hw_addr *ha;
2586         int err;
2587         u32 portid, seq;
2588
2589         portid = NETLINK_CB(cb->skb).portid;
2590         seq = cb->nlh->nlmsg_seq;
2591
2592         list_for_each_entry(ha, &list->list, list) {
2593                 if (*idx < cb->args[0])
2594                         goto skip;
2595
2596                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2597                                               portid, seq,
2598                                               RTM_NEWNEIGH, NTF_SELF,
2599                                               NLM_F_MULTI);
2600                 if (err < 0)
2601                         return err;
2602 skip:
2603                 *idx += 1;
2604         }
2605         return 0;
2606 }
2607
2608 /**
2609  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2610  * @nlh: netlink message header
2611  * @dev: netdevice
2612  *
2613  * Default netdevice operation to dump the existing unicast address list.
2614  * Returns number of addresses from list put in skb.
2615  */
2616 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2617                       struct netlink_callback *cb,
2618                       struct net_device *dev,
2619                       struct net_device *filter_dev,
2620                       int idx)
2621 {
2622         int err;
2623
2624         netif_addr_lock_bh(dev);
2625         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2626         if (err)
2627                 goto out;
2628         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2629 out:
2630         netif_addr_unlock_bh(dev);
2631         return idx;
2632 }
2633 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2634
2635 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2636 {
2637         struct net_device *dev;
2638         struct nlattr *tb[IFLA_MAX+1];
2639         struct net_device *bdev = NULL;
2640         struct net_device *br_dev = NULL;
2641         const struct net_device_ops *ops = NULL;
2642         const struct net_device_ops *cops = NULL;
2643         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2644         struct net *net = sock_net(skb->sk);
2645         int brport_idx = 0;
2646         int br_idx = 0;
2647         int idx = 0;
2648
2649         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2650                         ifla_policy) == 0) {
2651                 if (tb[IFLA_MASTER])
2652                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
2653         }
2654
2655         brport_idx = ifm->ifi_index;
2656
2657         if (br_idx) {
2658                 br_dev = __dev_get_by_index(net, br_idx);
2659                 if (!br_dev)
2660                         return -ENODEV;
2661
2662                 ops = br_dev->netdev_ops;
2663                 bdev = br_dev;
2664         }
2665
2666         for_each_netdev(net, dev) {
2667                 if (brport_idx && (dev->ifindex != brport_idx))
2668                         continue;
2669
2670                 if (!br_idx) { /* user did not specify a specific bridge */
2671                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
2672                                 br_dev = netdev_master_upper_dev_get(dev);
2673                                 cops = br_dev->netdev_ops;
2674                         }
2675
2676                         bdev = dev;
2677                 } else {
2678                         if (dev != br_dev &&
2679                             !(dev->priv_flags & IFF_BRIDGE_PORT))
2680                                 continue;
2681
2682                         if (br_dev != netdev_master_upper_dev_get(dev) &&
2683                             !(dev->priv_flags & IFF_EBRIDGE))
2684                                 continue;
2685
2686                         bdev = br_dev;
2687                         cops = ops;
2688                 }
2689
2690                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2691                         if (cops && cops->ndo_fdb_dump)
2692                                 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2693                                                          idx);
2694                 }
2695
2696                 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2697                 if (dev->netdev_ops->ndo_fdb_dump)
2698                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, bdev, dev,
2699                                                             idx);
2700
2701                 cops = NULL;
2702         }
2703
2704         cb->args[0] = idx;
2705         return skb->len;
2706 }
2707
2708 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
2709                                unsigned int attrnum, unsigned int flag)
2710 {
2711         if (mask & flag)
2712                 return nla_put_u8(skb, attrnum, !!(flags & flag));
2713         return 0;
2714 }
2715
2716 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2717                             struct net_device *dev, u16 mode,
2718                             u32 flags, u32 mask)
2719 {
2720         struct nlmsghdr *nlh;
2721         struct ifinfomsg *ifm;
2722         struct nlattr *br_afspec;
2723         struct nlattr *protinfo;
2724         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2725         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2726
2727         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2728         if (nlh == NULL)
2729                 return -EMSGSIZE;
2730
2731         ifm = nlmsg_data(nlh);
2732         ifm->ifi_family = AF_BRIDGE;
2733         ifm->__ifi_pad = 0;
2734         ifm->ifi_type = dev->type;
2735         ifm->ifi_index = dev->ifindex;
2736         ifm->ifi_flags = dev_get_flags(dev);
2737         ifm->ifi_change = 0;
2738
2739
2740         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2741             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2742             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2743             (br_dev &&
2744              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2745             (dev->addr_len &&
2746              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2747             (dev->ifindex != dev->iflink &&
2748              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2749                 goto nla_put_failure;
2750
2751         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2752         if (!br_afspec)
2753                 goto nla_put_failure;
2754
2755         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
2756                 nla_nest_cancel(skb, br_afspec);
2757                 goto nla_put_failure;
2758         }
2759
2760         if (mode != BRIDGE_MODE_UNDEF) {
2761                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2762                         nla_nest_cancel(skb, br_afspec);
2763                         goto nla_put_failure;
2764                 }
2765         }
2766         nla_nest_end(skb, br_afspec);
2767
2768         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
2769         if (!protinfo)
2770                 goto nla_put_failure;
2771
2772         if (brport_nla_put_flag(skb, flags, mask,
2773                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
2774             brport_nla_put_flag(skb, flags, mask,
2775                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
2776             brport_nla_put_flag(skb, flags, mask,
2777                                 IFLA_BRPORT_FAST_LEAVE,
2778                                 BR_MULTICAST_FAST_LEAVE) ||
2779             brport_nla_put_flag(skb, flags, mask,
2780                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
2781             brport_nla_put_flag(skb, flags, mask,
2782                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
2783             brport_nla_put_flag(skb, flags, mask,
2784                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
2785             brport_nla_put_flag(skb, flags, mask,
2786                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
2787             brport_nla_put_flag(skb, flags, mask,
2788                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
2789                 nla_nest_cancel(skb, protinfo);
2790                 goto nla_put_failure;
2791         }
2792
2793         nla_nest_end(skb, protinfo);
2794
2795         return nlmsg_end(skb, nlh);
2796 nla_put_failure:
2797         nlmsg_cancel(skb, nlh);
2798         return -EMSGSIZE;
2799 }
2800 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2801
2802 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2803 {
2804         struct net *net = sock_net(skb->sk);
2805         struct net_device *dev;
2806         int idx = 0;
2807         u32 portid = NETLINK_CB(cb->skb).portid;
2808         u32 seq = cb->nlh->nlmsg_seq;
2809         u32 filter_mask = 0;
2810
2811         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
2812                 struct nlattr *extfilt;
2813
2814                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2815                                           IFLA_EXT_MASK);
2816                 if (extfilt) {
2817                         if (nla_len(extfilt) < sizeof(filter_mask))
2818                                 return -EINVAL;
2819
2820                         filter_mask = nla_get_u32(extfilt);
2821                 }
2822         }
2823
2824         rcu_read_lock();
2825         for_each_netdev_rcu(net, dev) {
2826                 const struct net_device_ops *ops = dev->netdev_ops;
2827                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2828
2829                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2830                         if (idx >= cb->args[0] &&
2831                             br_dev->netdev_ops->ndo_bridge_getlink(
2832                                     skb, portid, seq, dev, filter_mask) < 0)
2833                                 break;
2834                         idx++;
2835                 }
2836
2837                 if (ops->ndo_bridge_getlink) {
2838                         if (idx >= cb->args[0] &&
2839                             ops->ndo_bridge_getlink(skb, portid, seq, dev,
2840                                                     filter_mask) < 0)
2841                                 break;
2842                         idx++;
2843                 }
2844         }
2845         rcu_read_unlock();
2846         cb->args[0] = idx;
2847
2848         return skb->len;
2849 }
2850
2851 static inline size_t bridge_nlmsg_size(void)
2852 {
2853         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2854                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
2855                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
2856                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
2857                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
2858                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
2859                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
2860                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
2861                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2862                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
2863                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
2864 }
2865
2866 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2867 {
2868         struct net *net = dev_net(dev);
2869         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2870         struct sk_buff *skb;
2871         int err = -EOPNOTSUPP;
2872
2873         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2874         if (!skb) {
2875                 err = -ENOMEM;
2876                 goto errout;
2877         }
2878
2879         if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2880             br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2881                 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2882                 if (err < 0)
2883                         goto errout;
2884         }
2885
2886         if ((flags & BRIDGE_FLAGS_SELF) &&
2887             dev->netdev_ops->ndo_bridge_getlink) {
2888                 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2889                 if (err < 0)
2890                         goto errout;
2891         }
2892
2893         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2894         return 0;
2895 errout:
2896         WARN_ON(err == -EMSGSIZE);
2897         kfree_skb(skb);
2898         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2899         return err;
2900 }
2901
2902 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2903 {
2904         struct net *net = sock_net(skb->sk);
2905         struct ifinfomsg *ifm;
2906         struct net_device *dev;
2907         struct nlattr *br_spec, *attr = NULL;
2908         int rem, err = -EOPNOTSUPP;
2909         u16 oflags, flags = 0;
2910         bool have_flags = false;
2911
2912         if (nlmsg_len(nlh) < sizeof(*ifm))
2913                 return -EINVAL;
2914
2915         ifm = nlmsg_data(nlh);
2916         if (ifm->ifi_family != AF_BRIDGE)
2917                 return -EPFNOSUPPORT;
2918
2919         dev = __dev_get_by_index(net, ifm->ifi_index);
2920         if (!dev) {
2921                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2922                 return -ENODEV;
2923         }
2924
2925         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2926         if (br_spec) {
2927                 nla_for_each_nested(attr, br_spec, rem) {
2928                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2929                                 if (nla_len(attr) < sizeof(flags))
2930                                         return -EINVAL;
2931
2932                                 have_flags = true;
2933                                 flags = nla_get_u16(attr);
2934                                 break;
2935                         }
2936                 }
2937         }
2938
2939         oflags = flags;
2940
2941         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2942                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2943
2944                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2945                         err = -EOPNOTSUPP;
2946                         goto out;
2947                 }
2948
2949                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2950                 if (err)
2951                         goto out;
2952
2953                 flags &= ~BRIDGE_FLAGS_MASTER;
2954         }
2955
2956         if ((flags & BRIDGE_FLAGS_SELF)) {
2957                 if (!dev->netdev_ops->ndo_bridge_setlink)
2958                         err = -EOPNOTSUPP;
2959                 else
2960                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2961
2962                 if (!err)
2963                         flags &= ~BRIDGE_FLAGS_SELF;
2964         }
2965
2966         if (have_flags)
2967                 memcpy(nla_data(attr), &flags, sizeof(flags));
2968         /* Generate event to notify upper layer of bridge change */
2969         if (!err)
2970                 err = rtnl_bridge_notify(dev, oflags);
2971 out:
2972         return err;
2973 }
2974
2975 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2976 {
2977         struct net *net = sock_net(skb->sk);
2978         struct ifinfomsg *ifm;
2979         struct net_device *dev;
2980         struct nlattr *br_spec, *attr = NULL;
2981         int rem, err = -EOPNOTSUPP;
2982         u16 oflags, flags = 0;
2983         bool have_flags = false;
2984
2985         if (nlmsg_len(nlh) < sizeof(*ifm))
2986                 return -EINVAL;
2987
2988         ifm = nlmsg_data(nlh);
2989         if (ifm->ifi_family != AF_BRIDGE)
2990                 return -EPFNOSUPPORT;
2991
2992         dev = __dev_get_by_index(net, ifm->ifi_index);
2993         if (!dev) {
2994                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2995                 return -ENODEV;
2996         }
2997
2998         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2999         if (br_spec) {
3000                 nla_for_each_nested(attr, br_spec, rem) {
3001                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3002                                 if (nla_len(attr) < sizeof(flags))
3003                                         return -EINVAL;
3004
3005                                 have_flags = true;
3006                                 flags = nla_get_u16(attr);
3007                                 break;
3008                         }
3009                 }
3010         }
3011
3012         oflags = flags;
3013
3014         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3015                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3016
3017                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3018                         err = -EOPNOTSUPP;
3019                         goto out;
3020                 }
3021
3022                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
3023                 if (err)
3024                         goto out;
3025
3026                 flags &= ~BRIDGE_FLAGS_MASTER;
3027         }
3028
3029         if ((flags & BRIDGE_FLAGS_SELF)) {
3030                 if (!dev->netdev_ops->ndo_bridge_dellink)
3031                         err = -EOPNOTSUPP;
3032                 else
3033                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
3034
3035                 if (!err)
3036                         flags &= ~BRIDGE_FLAGS_SELF;
3037         }
3038
3039         if (have_flags)
3040                 memcpy(nla_data(attr), &flags, sizeof(flags));
3041         /* Generate event to notify upper layer of bridge change */
3042         if (!err)
3043                 err = rtnl_bridge_notify(dev, oflags);
3044 out:
3045         return err;
3046 }
3047
3048 /* Process one rtnetlink message. */
3049
3050 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3051 {
3052         struct net *net = sock_net(skb->sk);
3053         rtnl_doit_func doit;
3054         int sz_idx, kind;
3055         int family;
3056         int type;
3057         int err;
3058
3059         type = nlh->nlmsg_type;
3060         if (type > RTM_MAX)
3061                 return -EOPNOTSUPP;
3062
3063         type -= RTM_BASE;
3064
3065         /* All the messages must have at least 1 byte length */
3066         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3067                 return 0;
3068
3069         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3070         sz_idx = type>>2;
3071         kind = type&3;
3072
3073         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3074                 return -EPERM;
3075
3076         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3077                 struct sock *rtnl;
3078                 rtnl_dumpit_func dumpit;
3079                 rtnl_calcit_func calcit;
3080                 u16 min_dump_alloc = 0;
3081
3082                 dumpit = rtnl_get_dumpit(family, type);
3083                 if (dumpit == NULL)
3084                         return -EOPNOTSUPP;
3085                 calcit = rtnl_get_calcit(family, type);
3086                 if (calcit)
3087                         min_dump_alloc = calcit(skb, nlh);
3088
3089                 __rtnl_unlock();
3090                 rtnl = net->rtnl;
3091                 {
3092                         struct netlink_dump_control c = {
3093                                 .dump           = dumpit,
3094                                 .min_dump_alloc = min_dump_alloc,
3095                         };
3096                         err = netlink_dump_start(rtnl, skb, nlh, &c);
3097                 }
3098                 rtnl_lock();
3099                 return err;
3100         }
3101
3102         doit = rtnl_get_doit(family, type);
3103         if (doit == NULL)
3104                 return -EOPNOTSUPP;
3105
3106         return doit(skb, nlh);
3107 }
3108
3109 static void rtnetlink_rcv(struct sk_buff *skb)
3110 {
3111         rtnl_lock();
3112         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3113         rtnl_unlock();
3114 }
3115
3116 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3117 {
3118         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3119
3120         switch (event) {
3121         case NETDEV_UP:
3122         case NETDEV_DOWN:
3123         case NETDEV_PRE_UP:
3124         case NETDEV_POST_INIT:
3125         case NETDEV_REGISTER:
3126         case NETDEV_CHANGE:
3127         case NETDEV_PRE_TYPE_CHANGE:
3128         case NETDEV_GOING_DOWN:
3129         case NETDEV_UNREGISTER:
3130         case NETDEV_UNREGISTER_FINAL:
3131         case NETDEV_RELEASE:
3132         case NETDEV_JOIN:
3133                 break;
3134         default:
3135                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3136                 break;
3137         }
3138         return NOTIFY_DONE;
3139 }
3140
3141 static struct notifier_block rtnetlink_dev_notifier = {
3142         .notifier_call  = rtnetlink_event,
3143 };
3144
3145
3146 static int __net_init rtnetlink_net_init(struct net *net)
3147 {
3148         struct sock *sk;
3149         struct netlink_kernel_cfg cfg = {
3150                 .groups         = RTNLGRP_MAX,
3151                 .input          = rtnetlink_rcv,
3152                 .cb_mutex       = &rtnl_mutex,
3153                 .flags          = NL_CFG_F_NONROOT_RECV,
3154         };
3155
3156         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3157         if (!sk)
3158                 return -ENOMEM;
3159         net->rtnl = sk;
3160         return 0;
3161 }
3162
3163 static void __net_exit rtnetlink_net_exit(struct net *net)
3164 {
3165         netlink_kernel_release(net->rtnl);
3166         net->rtnl = NULL;
3167 }
3168
3169 static struct pernet_operations rtnetlink_net_ops = {
3170         .init = rtnetlink_net_init,
3171         .exit = rtnetlink_net_exit,
3172 };
3173
3174 void __init rtnetlink_init(void)
3175 {
3176         if (register_pernet_subsys(&rtnetlink_net_ops))
3177                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3178
3179         register_netdevice_notifier(&rtnetlink_dev_notifier);
3180
3181         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3182                       rtnl_dump_ifinfo, rtnl_calcit);
3183         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3184         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3185         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3186
3187         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3188         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3189
3190         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3191         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3192         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3193
3194         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3195         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3196         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3197 }
3198