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/tcp.h>
  54 #include <net/sock.h>
  55 #include <net/pkt_sched.h>
  56 #include <net/fib_rules.h>
  57 #include <net/rtnetlink.h>
  58 #include <net/net_namespace.h>
  59
  60 struct rtnl_link {
  61         rtnl_doit_func          doit;
  62         rtnl_dumpit_func        dumpit;
  63         rtnl_calcit_func        calcit;
  64 };
  65
  66 static DEFINE_MUTEX(rtnl_mutex);
  67
  68 void rtnl_lock(void)
  69 {
  70         mutex_lock(&rtnl_mutex);
  71 }
  72 EXPORT_SYMBOL(rtnl_lock);
  73
  74 static struct sk_buff *defer_kfree_skb_list;
  75 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
  76 {
  77         if (head && tail) {
  78                 tail->next = defer_kfree_skb_list;
  79                 defer_kfree_skb_list = head;
  80         }
  81 }
  82 EXPORT_SYMBOL(rtnl_kfree_skbs);
  83
  84 void __rtnl_unlock(void)
  85 {
  86         struct sk_buff *head = defer_kfree_skb_list;
  87
  88         defer_kfree_skb_list = NULL;
  89
  90         mutex_unlock(&rtnl_mutex);
  91
  92         while (head) {
  93                 struct sk_buff *next = head->next;
  94
  95                 kfree_skb(head);
  96                 cond_resched();
  97                 head = next;
  98         }
  99 }
 100
 101 void rtnl_unlock(void)
 102 {
 103         /* This fellow will unlock it for us. */
 104         netdev_run_todo();
 105 }
 106 EXPORT_SYMBOL(rtnl_unlock);
 107
 108 int rtnl_trylock(void)
 109 {
 110         return mutex_trylock(&rtnl_mutex);
 111 }
 112 EXPORT_SYMBOL(rtnl_trylock);
 113
 114 int rtnl_is_locked(void)
 115 {
 116         return mutex_is_locked(&rtnl_mutex);
 117 }
 118 EXPORT_SYMBOL(rtnl_is_locked);
 119
 120 #ifdef CONFIG_PROVE_LOCKING
 121 bool lockdep_rtnl_is_held(void)
 122 {
 123         return lockdep_is_held(&rtnl_mutex);
 124 }
 125 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 126 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 127
 128 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 129
 130 static inline int rtm_msgindex(int msgtype)
 131 {
 132         int msgindex = msgtype - RTM_BASE;
 133
 134         /*
 135          * msgindex < 0 implies someone tried to register a netlink
 136          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 137          * the message type has not been added to linux/rtnetlink.h
 138          */
 139         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 140
 141         return msgindex;
 142 }
 143
 144 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
 145 {
 146         struct rtnl_link *tab;
 147
 148         if (protocol <= RTNL_FAMILY_MAX)
 149                 tab = rtnl_msg_handlers[protocol];
 150         else
 151                 tab = NULL;
 152
 153         if (tab == NULL || tab[msgindex].doit == NULL)
 154                 tab = rtnl_msg_handlers[PF_UNSPEC];
 155
 156         return tab[msgindex].doit;
 157 }
 158
 159 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
 160 {
 161         struct rtnl_link *tab;
 162
 163         if (protocol <= RTNL_FAMILY_MAX)
 164                 tab = rtnl_msg_handlers[protocol];
 165         else
 166                 tab = NULL;
 167
 168         if (tab == NULL || tab[msgindex].dumpit == NULL)
 169                 tab = rtnl_msg_handlers[PF_UNSPEC];
 170
 171         return tab[msgindex].dumpit;
 172 }
 173
 174 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
 175 {
 176         struct rtnl_link *tab;
 177
 178         if (protocol <= RTNL_FAMILY_MAX)
 179                 tab = rtnl_msg_handlers[protocol];
 180         else
 181                 tab = NULL;
 182
 183         if (tab == NULL || tab[msgindex].calcit == NULL)
 184                 tab = rtnl_msg_handlers[PF_UNSPEC];
 185
 186         return tab[msgindex].calcit;
 187 }
 188
 189 /**
 190  * __rtnl_register - Register a rtnetlink message type
 191  * @protocol: Protocol family or PF_UNSPEC
 192  * @msgtype: rtnetlink message type
 193  * @doit: Function pointer called for each request message
 194  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 195  * @calcit: Function pointer to calc size of dump message
 196  *
 197  * Registers the specified function pointers (at least one of them has
 198  * to be non-NULL) to be called whenever a request message for the
 199  * specified protocol family and message type is received.
 200  *
 201  * The special protocol family PF_UNSPEC may be used to define fallback
 202  * function pointers for the case when no entry for the specific protocol
 203  * family exists.
 204  *
 205  * Returns 0 on success or a negative error code.
 206  */
 207 int __rtnl_register(int protocol, int msgtype,
 208                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 209                     rtnl_calcit_func calcit)
 210 {
 211         struct rtnl_link *tab;
 212         int msgindex;
 213
 214         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 215         msgindex = rtm_msgindex(msgtype);
 216
 217         tab = rtnl_msg_handlers[protocol];
 218         if (tab == NULL) {
 219                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 220                 if (tab == NULL)
 221                         return -ENOBUFS;
 222
 223                 rtnl_msg_handlers[protocol] = tab;
 224         }
 225
 226         if (doit)
 227                 tab[msgindex].doit = doit;
 228
 229         if (dumpit)
 230                 tab[msgindex].dumpit = dumpit;
 231
 232         if (calcit)
 233                 tab[msgindex].calcit = calcit;
 234
 235         return 0;
 236 }
 237 EXPORT_SYMBOL_GPL(__rtnl_register);
 238
 239 /**
 240  * rtnl_register - Register a rtnetlink message type
 241  *
 242  * Identical to __rtnl_register() but panics on failure. This is useful
 243  * as failure of this function is very unlikely, it can only happen due
 244  * to lack of memory when allocating the chain to store all message
 245  * handlers for a protocol. Meant for use in init functions where lack
 246  * of memory implies no sense in continuing.
 247  */
 248 void rtnl_register(int protocol, int msgtype,
 249                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 250                    rtnl_calcit_func calcit)
 251 {
 252         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
 253                 panic("Unable to register rtnetlink message handler, "
 254                       "protocol = %d, message type = %d\n",
 255                       protocol, msgtype);
 256 }
 257 EXPORT_SYMBOL_GPL(rtnl_register);
 258
 259 /**
 260  * rtnl_unregister - Unregister a rtnetlink message type
 261  * @protocol: Protocol family or PF_UNSPEC
 262  * @msgtype: rtnetlink message type
 263  *
 264  * Returns 0 on success or a negative error code.
 265  */
 266 int rtnl_unregister(int protocol, int msgtype)
 267 {
 268         int msgindex;
 269
 270         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 271         msgindex = rtm_msgindex(msgtype);
 272
 273         if (rtnl_msg_handlers[protocol] == NULL)
 274                 return -ENOENT;
 275
 276         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 277         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
 278
 279         return 0;
 280 }
 281 EXPORT_SYMBOL_GPL(rtnl_unregister);
 282
 283 /**
 284  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 285  * @protocol : Protocol family or PF_UNSPEC
 286  *
 287  * Identical to calling rtnl_unregster() for all registered message types
 288  * of a certain protocol family.
 289  */
 290 void rtnl_unregister_all(int protocol)
 291 {
 292         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 293
 294         kfree(rtnl_msg_handlers[protocol]);
 295         rtnl_msg_handlers[protocol] = NULL;
 296 }
 297 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 298
 299 static LIST_HEAD(link_ops);
 300
 301 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 302 {
 303         const struct rtnl_link_ops *ops;
 304
 305         list_for_each_entry(ops, &link_ops, list) {
 306                 if (!strcmp(ops->kind, kind))
 307                         return ops;
 308         }
 309         return NULL;
 310 }
 311
 312 /**
 313  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 314  * @ops: struct rtnl_link_ops * to register
 315  *
 316  * The caller must hold the rtnl_mutex. This function should be used
 317  * by drivers that create devices during module initialization. It
 318  * must be called before registering the devices.
 319  *
 320  * Returns 0 on success or a negative error code.
 321  */
 322 int __rtnl_link_register(struct rtnl_link_ops *ops)
 323 {
 324         if (rtnl_link_ops_get(ops->kind))
 325                 return -EEXIST;
 326
 327         /* The check for setup is here because if ops
 328          * does not have that filled up, it is not possible
 329          * to use the ops for creating device. So do not
 330          * fill up dellink as well. That disables rtnl_dellink.
 331          */
 332         if (ops->setup && !ops->dellink)
 333                 ops->dellink = unregister_netdevice_queue;
 334
 335         list_add_tail(&ops->list, &link_ops);
 336         return 0;
 337 }
 338 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 339
 340 /**
 341  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 342  * @ops: struct rtnl_link_ops * to register
 343  *
 344  * Returns 0 on success or a negative error code.
 345  */
 346 int rtnl_link_register(struct rtnl_link_ops *ops)
 347 {
 348         int err;
 349
 350         rtnl_lock();
 351         err = __rtnl_link_register(ops);
 352         rtnl_unlock();
 353         return err;
 354 }
 355 EXPORT_SYMBOL_GPL(rtnl_link_register);
 356
 357 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 358 {
 359         struct net_device *dev;
 360         LIST_HEAD(list_kill);
 361
 362         for_each_netdev(net, dev) {
 363                 if (dev->rtnl_link_ops == ops)
 364                         ops->dellink(dev, &list_kill);
 365         }
 366         unregister_netdevice_many(&list_kill);
 367 }
 368
 369 /**
 370  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 371  * @ops: struct rtnl_link_ops * to unregister
 372  *
 373  * The caller must hold the rtnl_mutex.
 374  */
 375 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 376 {
 377         struct net *net;
 378
 379         for_each_net(net) {
 380                 __rtnl_kill_links(net, ops);
 381         }
 382         list_del(&ops->list);
 383 }
 384 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 385
 386 /* Return with the rtnl_lock held when there are no network
 387  * devices unregistering in any network namespace.
 388  */
 389 static void rtnl_lock_unregistering_all(void)
 390 {
 391         struct net *net;
 392         bool unregistering;
 393         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 394
 395         add_wait_queue(&netdev_unregistering_wq, &wait);
 396         for (;;) {
 397                 unregistering = false;
 398                 rtnl_lock();
 399                 for_each_net(net) {
 400                         if (net->dev_unreg_count > 0) {
 401                                 unregistering = true;
 402                                 break;
 403                         }
 404                 }
 405                 if (!unregistering)
 406                         break;
 407                 __rtnl_unlock();
 408
 409                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 410         }
 411         remove_wait_queue(&netdev_unregistering_wq, &wait);
 412 }
 413
 414 /**
 415  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 416  * @ops: struct rtnl_link_ops * to unregister
 417  */
 418 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 419 {
 420         /* Close the race with cleanup_net() */
 421         mutex_lock(&net_mutex);
 422         rtnl_lock_unregistering_all();
 423         __rtnl_link_unregister(ops);
 424         rtnl_unlock();
 425         mutex_unlock(&net_mutex);
 426 }
 427 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 428
 429 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 430 {
 431         struct net_device *master_dev;
 432         const struct rtnl_link_ops *ops;
 433
 434         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 435         if (!master_dev)
 436                 return 0;
 437         ops = master_dev->rtnl_link_ops;
 438         if (!ops || !ops->get_slave_size)
 439                 return 0;
 440         /* IFLA_INFO_SLAVE_DATA + nested data */
 441         return nla_total_size(sizeof(struct nlattr)) +
 442                ops->get_slave_size(master_dev, dev);
 443 }
 444
 445 static size_t rtnl_link_get_size(const struct net_device *dev)
 446 {
 447         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 448         size_t size;
 449
 450         if (!ops)
 451                 return 0;
 452
 453         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 454                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 455
 456         if (ops->get_size)
 457                 /* IFLA_INFO_DATA + nested data */
 458                 size += nla_total_size(sizeof(struct nlattr)) +
 459                         ops->get_size(dev);
 460
 461         if (ops->get_xstats_size)
 462                 /* IFLA_INFO_XSTATS */
 463                 size += nla_total_size(ops->get_xstats_size(dev));
 464
 465         size += rtnl_link_get_slave_info_data_size(dev);
 466
 467         return size;
 468 }
 469
 470 static LIST_HEAD(rtnl_af_ops);
 471
 472 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 473 {
 474         const struct rtnl_af_ops *ops;
 475
 476         list_for_each_entry(ops, &rtnl_af_ops, list) {
 477                 if (ops->family == family)
 478                         return ops;
 479         }
 480
 481         return NULL;
 482 }
 483
 484 /**
 485  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 486  * @ops: struct rtnl_af_ops * to register
 487  *
 488  * Returns 0 on success or a negative error code.
 489  */
 490 void rtnl_af_register(struct rtnl_af_ops *ops)
 491 {
 492         rtnl_lock();
 493         list_add_tail(&ops->list, &rtnl_af_ops);
 494         rtnl_unlock();
 495 }
 496 EXPORT_SYMBOL_GPL(rtnl_af_register);
 497
 498 /**
 499  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 500  * @ops: struct rtnl_af_ops * to unregister
 501  *
 502  * The caller must hold the rtnl_mutex.
 503  */
 504 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 505 {
 506         list_del(&ops->list);
 507 }
 508 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 509
 510 /**
 511  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 512  * @ops: struct rtnl_af_ops * to unregister
 513  */
 514 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 515 {
 516         rtnl_lock();
 517         __rtnl_af_unregister(ops);
 518         rtnl_unlock();
 519 }
 520 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 521
 522 static size_t rtnl_link_get_af_size(const struct net_device *dev,
 523                                     u32 ext_filter_mask)
 524 {
 525         struct rtnl_af_ops *af_ops;
 526         size_t size;
 527
 528         /* IFLA_AF_SPEC */
 529         size = nla_total_size(sizeof(struct nlattr));
 530
 531         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 532                 if (af_ops->get_link_af_size) {
 533                         /* AF_* + nested data */
 534                         size += nla_total_size(sizeof(struct nlattr)) +
 535                                 af_ops->get_link_af_size(dev, ext_filter_mask);
 536                 }
 537         }
 538
 539         return size;
 540 }
 541
 542 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 543 {
 544         struct net_device *master_dev;
 545
 546         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 547         if (master_dev && master_dev->rtnl_link_ops)
 548                 return true;
 549         return false;
 550 }
 551
 552 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 553                                      const struct net_device *dev)
 554 {
 555         struct net_device *master_dev;
 556         const struct rtnl_link_ops *ops;
 557         struct nlattr *slave_data;
 558         int err;
 559
 560         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 561         if (!master_dev)
 562                 return 0;
 563         ops = master_dev->rtnl_link_ops;
 564         if (!ops)
 565                 return 0;
 566         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 567                 return -EMSGSIZE;
 568         if (ops->fill_slave_info) {
 569                 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
 570                 if (!slave_data)
 571                         return -EMSGSIZE;
 572                 err = ops->fill_slave_info(skb, master_dev, dev);
 573                 if (err < 0)
 574                         goto err_cancel_slave_data;
 575                 nla_nest_end(skb, slave_data);
 576         }
 577         return 0;
 578
 579 err_cancel_slave_data:
 580         nla_nest_cancel(skb, slave_data);
 581         return err;
 582 }
 583
 584 static int rtnl_link_info_fill(struct sk_buff *skb,
 585                                const struct net_device *dev)
 586 {
 587         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 588         struct nlattr *data;
 589         int err;
 590
 591         if (!ops)
 592                 return 0;
 593         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 594                 return -EMSGSIZE;
 595         if (ops->fill_xstats) {
 596                 err = ops->fill_xstats(skb, dev);
 597                 if (err < 0)
 598                         return err;
 599         }
 600         if (ops->fill_info) {
 601                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 602                 if (data == NULL)
 603                         return -EMSGSIZE;
 604                 err = ops->fill_info(skb, dev);
 605                 if (err < 0)
 606                         goto err_cancel_data;
 607                 nla_nest_end(skb, data);
 608         }
 609         return 0;
 610
 611 err_cancel_data:
 612         nla_nest_cancel(skb, data);
 613         return err;
 614 }
 615
 616 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 617 {
 618         struct nlattr *linkinfo;
 619         int err = -EMSGSIZE;
 620
 621         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 622         if (linkinfo == NULL)
 623                 goto out;
 624
 625         err = rtnl_link_info_fill(skb, dev);
 626         if (err < 0)
 627                 goto err_cancel_link;
 628
 629         err = rtnl_link_slave_info_fill(skb, dev);
 630         if (err < 0)
 631                 goto err_cancel_link;
 632
 633         nla_nest_end(skb, linkinfo);
 634         return 0;
 635
 636 err_cancel_link:
 637         nla_nest_cancel(skb, linkinfo);
 638 out:
 639         return err;
 640 }
 641
 642 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 643 {
 644         struct sock *rtnl = net->rtnl;
 645         int err = 0;
 646
 647         NETLINK_CB(skb).dst_group = group;
 648         if (echo)
 649                 atomic_inc(&skb->users);
 650         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 651         if (echo)
 652                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 653         return err;
 654 }
 655
 656 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 657 {
 658         struct sock *rtnl = net->rtnl;
 659
 660         return nlmsg_unicast(rtnl, skb, pid);
 661 }
 662 EXPORT_SYMBOL(rtnl_unicast);
 663
 664 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 665                  struct nlmsghdr *nlh, gfp_t flags)
 666 {
 667         struct sock *rtnl = net->rtnl;
 668         int report = 0;
 669
 670         if (nlh)
 671                 report = nlmsg_report(nlh);
 672
 673         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 674 }
 675 EXPORT_SYMBOL(rtnl_notify);
 676
 677 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 678 {
 679         struct sock *rtnl = net->rtnl;
 680
 681         netlink_set_err(rtnl, 0, group, error);
 682 }
 683 EXPORT_SYMBOL(rtnl_set_sk_err);
 684
 685 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 686 {
 687         struct nlattr *mx;
 688         int i, valid = 0;
 689
 690         mx = nla_nest_start(skb, RTA_METRICS);
 691         if (mx == NULL)
 692                 return -ENOBUFS;
 693
 694         for (i = 0; i < RTAX_MAX; i++) {
 695                 if (metrics[i]) {
 696                         if (i == RTAX_CC_ALGO - 1) {
 697                                 char tmp[TCP_CA_NAME_MAX], *name;
 698
 699                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 700                                 if (!name)
 701                                         continue;
 702                                 if (nla_put_string(skb, i + 1, name))
 703                                         goto nla_put_failure;
 704                         } else if (i == RTAX_FEATURES - 1) {
 705                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 706
 707                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 708                                 if (nla_put_u32(skb, i + 1, user_features))
 709                                         goto nla_put_failure;
 710                         } else {
 711                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 712                                         goto nla_put_failure;
 713                         }
 714                         valid++;
 715                 }
 716         }
 717
 718         if (!valid) {
 719                 nla_nest_cancel(skb, mx);
 720                 return 0;
 721         }
 722
 723         return nla_nest_end(skb, mx);
 724
 725 nla_put_failure:
 726         nla_nest_cancel(skb, mx);
 727         return -EMSGSIZE;
 728 }
 729 EXPORT_SYMBOL(rtnetlink_put_metrics);
 730
 731 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 732                        long expires, u32 error)
 733 {
 734         struct rta_cacheinfo ci = {
 735                 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
 736                 .rta_used = dst->__use,
 737                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 738                 .rta_error = error,
 739                 .rta_id =  id,
 740         };
 741
 742         if (expires) {
 743                 unsigned long clock;
 744
 745                 clock = jiffies_to_clock_t(abs(expires));
 746                 clock = min_t(unsigned long, clock, INT_MAX);
 747                 ci.rta_expires = (expires > 0) ? clock : -clock;
 748         }
 749         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 750 }
 751 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 752
 753 static void set_operstate(struct net_device *dev, unsigned char transition)
 754 {
 755         unsigned char operstate = dev->operstate;
 756
 757         switch (transition) {
 758         case IF_OPER_UP:
 759                 if ((operstate == IF_OPER_DORMANT ||
 760                      operstate == IF_OPER_UNKNOWN) &&
 761                     !netif_dormant(dev))
 762                         operstate = IF_OPER_UP;
 763                 break;
 764
 765         case IF_OPER_DORMANT:
 766                 if (operstate == IF_OPER_UP ||
 767                     operstate == IF_OPER_UNKNOWN)
 768                         operstate = IF_OPER_DORMANT;
 769                 break;
 770         }
 771
 772         if (dev->operstate != operstate) {
 773                 write_lock_bh(&dev_base_lock);
 774                 dev->operstate = operstate;
 775                 write_unlock_bh(&dev_base_lock);
 776                 netdev_state_change(dev);
 777         }
 778 }
 779
 780 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 781 {
 782         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 783                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 784 }
 785
 786 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 787                                            const struct ifinfomsg *ifm)
 788 {
 789         unsigned int flags = ifm->ifi_flags;
 790
 791         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 792         if (ifm->ifi_change)
 793                 flags = (flags & ifm->ifi_change) |
 794                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 795
 796         return flags;
 797 }
 798
 799 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 800                                  const struct rtnl_link_stats64 *b)
 801 {
 802         a->rx_packets = b->rx_packets;
 803         a->tx_packets = b->tx_packets;
 804         a->rx_bytes = b->rx_bytes;
 805         a->tx_bytes = b->tx_bytes;
 806         a->rx_errors = b->rx_errors;
 807         a->tx_errors = b->tx_errors;
 808         a->rx_dropped = b->rx_dropped;
 809         a->tx_dropped = b->tx_dropped;
 810
 811         a->multicast = b->multicast;
 812         a->collisions = b->collisions;
 813
 814         a->rx_length_errors = b->rx_length_errors;
 815         a->rx_over_errors = b->rx_over_errors;
 816         a->rx_crc_errors = b->rx_crc_errors;
 817         a->rx_frame_errors = b->rx_frame_errors;
 818         a->rx_fifo_errors = b->rx_fifo_errors;
 819         a->rx_missed_errors = b->rx_missed_errors;
 820
 821         a->tx_aborted_errors = b->tx_aborted_errors;
 822         a->tx_carrier_errors = b->tx_carrier_errors;
 823         a->tx_fifo_errors = b->tx_fifo_errors;
 824         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 825         a->tx_window_errors = b->tx_window_errors;
 826
 827         a->rx_compressed = b->rx_compressed;
 828         a->tx_compressed = b->tx_compressed;
 829
 830         a->rx_nohandler = b->rx_nohandler;
 831 }
 832
 833 /* All VF info */
 834 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 835                                    u32 ext_filter_mask)
 836 {
 837         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 838             (ext_filter_mask & RTEXT_FILTER_VF)) {
 839                 int num_vfs = dev_num_vf(dev->dev.parent);
 840                 size_t size = nla_total_size(sizeof(struct nlattr));
 841                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 842                 size += num_vfs *
 843                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 844                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 845                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 846                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 847                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 848                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 849                          /* IFLA_VF_STATS_RX_PACKETS */
 850                          nla_total_size_64bit(sizeof(__u64)) +
 851                          /* IFLA_VF_STATS_TX_PACKETS */
 852                          nla_total_size_64bit(sizeof(__u64)) +
 853                          /* IFLA_VF_STATS_RX_BYTES */
 854                          nla_total_size_64bit(sizeof(__u64)) +
 855                          /* IFLA_VF_STATS_TX_BYTES */
 856                          nla_total_size_64bit(sizeof(__u64)) +
 857                          /* IFLA_VF_STATS_BROADCAST */
 858                          nla_total_size_64bit(sizeof(__u64)) +
 859                          /* IFLA_VF_STATS_MULTICAST */
 860                          nla_total_size_64bit(sizeof(__u64)) +
 861                          nla_total_size(sizeof(struct ifla_vf_trust)));
 862                 return size;
 863         } else
 864                 return 0;
 865 }
 866
 867 static size_t rtnl_port_size(const struct net_device *dev,
 868                              u32 ext_filter_mask)
 869 {
 870         size_t port_size = nla_total_size(4)            /* PORT_VF */
 871                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 872                 + nla_total_size(sizeof(struct ifla_port_vsi))
 873                                                         /* PORT_VSI_TYPE */
 874                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 875                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 876                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 877                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 878         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 879         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 880                 + port_size;
 881         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 882                 + port_size;
 883
 884         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 885             !(ext_filter_mask & RTEXT_FILTER_VF))
 886                 return 0;
 887         if (dev_num_vf(dev->dev.parent))
 888                 return port_self_size + vf_ports_size +
 889                         vf_port_size * dev_num_vf(dev->dev.parent);
 890         else
 891                 return port_self_size;
 892 }
 893
 894 static size_t rtnl_xdp_size(const struct net_device *dev)
 895 {
 896         size_t xdp_size = nla_total_size(1);    /* XDP_ATTACHED */
 897
 898         if (!dev->netdev_ops->ndo_xdp)
 899                 return 0;
 900         else
 901                 return xdp_size;
 902 }
 903
 904 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 905                                      u32 ext_filter_mask)
 906 {
 907         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 908                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 909                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 910                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 911                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
 912                + nla_total_size(sizeof(struct rtnl_link_stats))
 913                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
 914                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 915                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 916                + nla_total_size(4) /* IFLA_TXQLEN */
 917                + nla_total_size(4) /* IFLA_WEIGHT */
 918                + nla_total_size(4) /* IFLA_MTU */
 919                + nla_total_size(4) /* IFLA_LINK */
 920                + nla_total_size(4) /* IFLA_MASTER */
 921                + nla_total_size(1) /* IFLA_CARRIER */
 922                + nla_total_size(4) /* IFLA_PROMISCUITY */
 923                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 924                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 925                + nla_total_size(4) /* IFLA_MAX_GSO_SEGS */
 926                + nla_total_size(4) /* IFLA_MAX_GSO_SIZE */
 927                + nla_total_size(1) /* IFLA_OPERSTATE */
 928                + nla_total_size(1) /* IFLA_LINKMODE */
 929                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
 930                + nla_total_size(4) /* IFLA_LINK_NETNSID */
 931                + nla_total_size(ext_filter_mask
 932                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 933                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 934                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 935                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 936                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
 937                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
 938                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
 939                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
 940                + rtnl_xdp_size(dev) /* IFLA_XDP */
 941                + nla_total_size(1); /* IFLA_PROTO_DOWN */
 942
 943 }
 944
 945 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 946 {
 947         struct nlattr *vf_ports;
 948         struct nlattr *vf_port;
 949         int vf;
 950         int err;
 951
 952         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 953         if (!vf_ports)
 954                 return -EMSGSIZE;
 955
 956         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 957                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 958                 if (!vf_port)
 959                         goto nla_put_failure;
 960                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 961                         goto nla_put_failure;
 962                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 963                 if (err == -EMSGSIZE)
 964                         goto nla_put_failure;
 965                 if (err) {
 966                         nla_nest_cancel(skb, vf_port);
 967                         continue;
 968                 }
 969                 nla_nest_end(skb, vf_port);
 970         }
 971
 972         nla_nest_end(skb, vf_ports);
 973
 974         return 0;
 975
 976 nla_put_failure:
 977         nla_nest_cancel(skb, vf_ports);
 978         return -EMSGSIZE;
 979 }
 980
 981 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 982 {
 983         struct nlattr *port_self;
 984         int err;
 985
 986         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 987         if (!port_self)
 988                 return -EMSGSIZE;
 989
 990         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 991         if (err) {
 992                 nla_nest_cancel(skb, port_self);
 993                 return (err == -EMSGSIZE) ? err : 0;
 994         }
 995
 996         nla_nest_end(skb, port_self);
 997
 998         return 0;
 999 }
1000
1001 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1002                           u32 ext_filter_mask)
1003 {
1004         int err;
1005
1006         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1007             !(ext_filter_mask & RTEXT_FILTER_VF))
1008                 return 0;
1009
1010         err = rtnl_port_self_fill(skb, dev);
1011         if (err)
1012                 return err;
1013
1014         if (dev_num_vf(dev->dev.parent)) {
1015                 err = rtnl_vf_ports_fill(skb, dev);
1016                 if (err)
1017                         return err;
1018         }
1019
1020         return 0;
1021 }
1022
1023 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1024 {
1025         int err;
1026         struct netdev_phys_item_id ppid;
1027
1028         err = dev_get_phys_port_id(dev, &ppid);
1029         if (err) {
1030                 if (err == -EOPNOTSUPP)
1031                         return 0;
1032                 return err;
1033         }
1034
1035         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1036                 return -EMSGSIZE;
1037
1038         return 0;
1039 }
1040
1041 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1042 {
1043         char name[IFNAMSIZ];
1044         int err;
1045
1046         err = dev_get_phys_port_name(dev, name, sizeof(name));
1047         if (err) {
1048                 if (err == -EOPNOTSUPP)
1049                         return 0;
1050                 return err;
1051         }
1052
1053         if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
1054                 return -EMSGSIZE;
1055
1056         return 0;
1057 }
1058
1059 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1060 {
1061         int err;
1062         struct switchdev_attr attr = {
1063                 .orig_dev = dev,
1064                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1065                 .flags = SWITCHDEV_F_NO_RECURSE,
1066         };
1067
1068         err = switchdev_port_attr_get(dev, &attr);
1069         if (err) {
1070                 if (err == -EOPNOTSUPP)
1071                         return 0;
1072                 return err;
1073         }
1074
1075         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1076                     attr.u.ppid.id))
1077                 return -EMSGSIZE;
1078
1079         return 0;
1080 }
1081
1082 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1083                                               struct net_device *dev)
1084 {
1085         struct rtnl_link_stats64 *sp;
1086         struct nlattr *attr;
1087
1088         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1089                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1090         if (!attr)
1091                 return -EMSGSIZE;
1092
1093         sp = nla_data(attr);
1094         dev_get_stats(dev, sp);
1095
1096         attr = nla_reserve(skb, IFLA_STATS,
1097                            sizeof(struct rtnl_link_stats));
1098         if (!attr)
1099                 return -EMSGSIZE;
1100
1101         copy_rtnl_link_stats(nla_data(attr), sp);
1102
1103         return 0;
1104 }
1105
1106 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1107                                                struct net_device *dev,
1108                                                int vfs_num,
1109                                                struct nlattr *vfinfo)
1110 {
1111         struct ifla_vf_rss_query_en vf_rss_query_en;
1112         struct ifla_vf_link_state vf_linkstate;
1113         struct ifla_vf_spoofchk vf_spoofchk;
1114         struct ifla_vf_tx_rate vf_tx_rate;
1115         struct ifla_vf_stats vf_stats;
1116         struct ifla_vf_trust vf_trust;
1117         struct ifla_vf_vlan vf_vlan;
1118         struct ifla_vf_rate vf_rate;
1119         struct nlattr *vf, *vfstats;
1120         struct ifla_vf_mac vf_mac;
1121         struct ifla_vf_info ivi;
1122
1123         /* Not all SR-IOV capable drivers support the
1124          * spoofcheck and "RSS query enable" query.  Preset to
1125          * -1 so the user space tool can detect that the driver
1126          * didn't report anything.
1127          */
1128         ivi.spoofchk = -1;
1129         ivi.rss_query_en = -1;
1130         ivi.trusted = -1;
1131         memset(ivi.mac, 0, sizeof(ivi.mac));
1132         /* The default value for VF link state is "auto"
1133          * IFLA_VF_LINK_STATE_AUTO which equals zero
1134          */
1135         ivi.linkstate = 0;
1136         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1137                 return 0;
1138
1139         vf_mac.vf =
1140                 vf_vlan.vf =
1141                 vf_rate.vf =
1142                 vf_tx_rate.vf =
1143                 vf_spoofchk.vf =
1144                 vf_linkstate.vf =
1145                 vf_rss_query_en.vf =
1146                 vf_trust.vf = ivi.vf;
1147
1148         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1149         vf_vlan.vlan = ivi.vlan;
1150         vf_vlan.qos = ivi.qos;
1151         vf_tx_rate.rate = ivi.max_tx_rate;
1152         vf_rate.min_tx_rate = ivi.min_tx_rate;
1153         vf_rate.max_tx_rate = ivi.max_tx_rate;
1154         vf_spoofchk.setting = ivi.spoofchk;
1155         vf_linkstate.link_state = ivi.linkstate;
1156         vf_rss_query_en.setting = ivi.rss_query_en;
1157         vf_trust.setting = ivi.trusted;
1158         vf = nla_nest_start(skb, IFLA_VF_INFO);
1159         if (!vf) {
1160                 nla_nest_cancel(skb, vfinfo);
1161                 return -EMSGSIZE;
1162         }
1163         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1164             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1165             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1166                     &vf_rate) ||
1167             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1168                     &vf_tx_rate) ||
1169             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1170                     &vf_spoofchk) ||
1171             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1172                     &vf_linkstate) ||
1173             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1174                     sizeof(vf_rss_query_en),
1175                     &vf_rss_query_en) ||
1176             nla_put(skb, IFLA_VF_TRUST,
1177                     sizeof(vf_trust), &vf_trust))
1178                 return -EMSGSIZE;
1179         memset(&vf_stats, 0, sizeof(vf_stats));
1180         if (dev->netdev_ops->ndo_get_vf_stats)
1181                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1182                                                 &vf_stats);
1183         vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1184         if (!vfstats) {
1185                 nla_nest_cancel(skb, vf);
1186                 nla_nest_cancel(skb, vfinfo);
1187                 return -EMSGSIZE;
1188         }
1189         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1190                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1191             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1192                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1193             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1194                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1195             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1196                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1197             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1198                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1199             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1200                               vf_stats.multicast, IFLA_VF_STATS_PAD))
1201                 return -EMSGSIZE;
1202         nla_nest_end(skb, vfstats);
1203         nla_nest_end(skb, vf);
1204         return 0;
1205 }
1206
1207 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1208 {
1209         struct rtnl_link_ifmap map;
1210
1211         memset(&map, 0, sizeof(map));
1212         map.mem_start   = dev->mem_start;
1213         map.mem_end     = dev->mem_end;
1214         map.base_addr   = dev->base_addr;
1215         map.irq         = dev->irq;
1216         map.dma         = dev->dma;
1217         map.port        = dev->if_port;
1218
1219         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1220                 return -EMSGSIZE;
1221
1222         return 0;
1223 }
1224
1225 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1226 {
1227         struct netdev_xdp xdp_op = {};
1228         struct nlattr *xdp;
1229         int err;
1230
1231         if (!dev->netdev_ops->ndo_xdp)
1232                 return 0;
1233         xdp = nla_nest_start(skb, IFLA_XDP);
1234         if (!xdp)
1235                 return -EMSGSIZE;
1236         xdp_op.command = XDP_QUERY_PROG;
1237         err = dev->netdev_ops->ndo_xdp(dev, &xdp_op);
1238         if (err)
1239                 goto err_cancel;
1240         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, xdp_op.prog_attached);
1241         if (err)
1242                 goto err_cancel;
1243
1244         nla_nest_end(skb, xdp);
1245         return 0;
1246
1247 err_cancel:
1248         nla_nest_cancel(skb, xdp);
1249         return err;
1250 }
1251
1252 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1253                             int type, u32 pid, u32 seq, u32 change,
1254                             unsigned int flags, u32 ext_filter_mask)
1255 {
1256         struct ifinfomsg *ifm;
1257         struct nlmsghdr *nlh;
1258         struct nlattr *af_spec;
1259         struct rtnl_af_ops *af_ops;
1260         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1261
1262         ASSERT_RTNL();
1263         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1264         if (nlh == NULL)
1265                 return -EMSGSIZE;
1266
1267         ifm = nlmsg_data(nlh);
1268         ifm->ifi_family = AF_UNSPEC;
1269         ifm->__ifi_pad = 0;
1270         ifm->ifi_type = dev->type;
1271         ifm->ifi_index = dev->ifindex;
1272         ifm->ifi_flags = dev_get_flags(dev);
1273         ifm->ifi_change = change;
1274
1275         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1276             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1277             nla_put_u8(skb, IFLA_OPERSTATE,
1278                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1279             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1280             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1281             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1282             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1283             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1284             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1285             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1286 #ifdef CONFIG_RPS
1287             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1288 #endif
1289             (dev->ifindex != dev_get_iflink(dev) &&
1290              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1291             (upper_dev &&
1292              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1293             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1294             (dev->qdisc &&
1295              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1296             (dev->ifalias &&
1297              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1298             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1299                         atomic_read(&dev->carrier_changes)) ||
1300             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1301                 goto nla_put_failure;
1302
1303         if (rtnl_fill_link_ifmap(skb, dev))
1304                 goto nla_put_failure;
1305
1306         if (dev->addr_len) {
1307                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1308                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1309                         goto nla_put_failure;
1310         }
1311
1312         if (rtnl_phys_port_id_fill(skb, dev))
1313                 goto nla_put_failure;
1314
1315         if (rtnl_phys_port_name_fill(skb, dev))
1316                 goto nla_put_failure;
1317
1318         if (rtnl_phys_switch_id_fill(skb, dev))
1319                 goto nla_put_failure;
1320
1321         if (rtnl_fill_stats(skb, dev))
1322                 goto nla_put_failure;
1323
1324         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1325             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1326                 goto nla_put_failure;
1327
1328         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent &&
1329             ext_filter_mask & RTEXT_FILTER_VF) {
1330                 int i;
1331                 struct nlattr *vfinfo;
1332                 int num_vfs = dev_num_vf(dev->dev.parent);
1333
1334                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1335                 if (!vfinfo)
1336                         goto nla_put_failure;
1337                 for (i = 0; i < num_vfs; i++) {
1338                         if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1339                                 goto nla_put_failure;
1340                 }
1341
1342                 nla_nest_end(skb, vfinfo);
1343         }
1344
1345         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1346                 goto nla_put_failure;
1347
1348         if (rtnl_xdp_fill(skb, dev))
1349                 goto nla_put_failure;
1350
1351         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1352                 if (rtnl_link_fill(skb, dev) < 0)
1353                         goto nla_put_failure;
1354         }
1355
1356         if (dev->rtnl_link_ops &&
1357             dev->rtnl_link_ops->get_link_net) {
1358                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1359
1360                 if (!net_eq(dev_net(dev), link_net)) {
1361                         int id = peernet2id_alloc(dev_net(dev), link_net);
1362
1363                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1364                                 goto nla_put_failure;
1365                 }
1366         }
1367
1368         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1369                 goto nla_put_failure;
1370
1371         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1372                 if (af_ops->fill_link_af) {
1373                         struct nlattr *af;
1374                         int err;
1375
1376                         if (!(af = nla_nest_start(skb, af_ops->family)))
1377                                 goto nla_put_failure;
1378
1379                         err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1380
1381                         /*
1382                          * Caller may return ENODATA to indicate that there
1383                          * was no data to be dumped. This is not an error, it
1384                          * means we should trim the attribute header and
1385                          * continue.
1386                          */
1387                         if (err == -ENODATA)
1388                                 nla_nest_cancel(skb, af);
1389                         else if (err < 0)
1390                                 goto nla_put_failure;
1391
1392                         nla_nest_end(skb, af);
1393                 }
1394         }
1395
1396         nla_nest_end(skb, af_spec);
1397
1398         nlmsg_end(skb, nlh);
1399         return 0;
1400
1401 nla_put_failure:
1402         nlmsg_cancel(skb, nlh);
1403         return -EMSGSIZE;
1404 }
1405
1406 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1407         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1408         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1409         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1410         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1411         [IFLA_MTU]              = { .type = NLA_U32 },
1412         [IFLA_LINK]             = { .type = NLA_U32 },
1413         [IFLA_MASTER]           = { .type = NLA_U32 },
1414         [IFLA_CARRIER]          = { .type = NLA_U8 },
1415         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1416         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1417         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1418         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1419         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1420         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1421         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1422         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1423         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1424         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1425         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1426         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1427         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1428         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1429         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1430         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1431         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1432         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1433         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1434         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1435         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1436         [IFLA_XDP]              = { .type = NLA_NESTED },
1437 };
1438
1439 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1440         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1441         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1442         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1443         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1444 };
1445
1446 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1447         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1448         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1449         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1450         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1451         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1452         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1453         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1454         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1455         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1456         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1457         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1458 };
1459
1460 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1461         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1462         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1463                                     .len = PORT_PROFILE_MAX },
1464         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1465                                     .len = sizeof(struct ifla_port_vsi)},
1466         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1467                                       .len = PORT_UUID_MAX },
1468         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1469                                     .len = PORT_UUID_MAX },
1470         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1471         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1472 };
1473
1474 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1475         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1476         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1477 };
1478
1479 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1480 {
1481         const struct rtnl_link_ops *ops = NULL;
1482         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1483
1484         if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0)
1485                 return NULL;
1486
1487         if (linfo[IFLA_INFO_KIND]) {
1488                 char kind[MODULE_NAME_LEN];
1489
1490                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1491                 ops = rtnl_link_ops_get(kind);
1492         }
1493
1494         return ops;
1495 }
1496
1497 static bool link_master_filtered(struct net_device *dev, int master_idx)
1498 {
1499         struct net_device *master;
1500
1501         if (!master_idx)
1502                 return false;
1503
1504         master = netdev_master_upper_dev_get(dev);
1505         if (!master || master->ifindex != master_idx)
1506                 return true;
1507
1508         return false;
1509 }
1510
1511 static bool link_kind_filtered(const struct net_device *dev,
1512                                const struct rtnl_link_ops *kind_ops)
1513 {
1514         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1515                 return true;
1516
1517         return false;
1518 }
1519
1520 static bool link_dump_filtered(struct net_device *dev,
1521                                int master_idx,
1522                                const struct rtnl_link_ops *kind_ops)
1523 {
1524         if (link_master_filtered(dev, master_idx) ||
1525             link_kind_filtered(dev, kind_ops))
1526                 return true;
1527
1528         return false;
1529 }
1530
1531 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1532 {
1533         struct net *net = sock_net(skb->sk);
1534         int h, s_h;
1535         int idx = 0, s_idx;
1536         struct net_device *dev;
1537         struct hlist_head *head;
1538         struct nlattr *tb[IFLA_MAX+1];
1539         u32 ext_filter_mask = 0;
1540         const struct rtnl_link_ops *kind_ops = NULL;
1541         unsigned int flags = NLM_F_MULTI;
1542         int master_idx = 0;
1543         int err;
1544         int hdrlen;
1545
1546         s_h = cb->args[0];
1547         s_idx = cb->args[1];
1548
1549         cb->seq = net->dev_base_seq;
1550
1551         /* A hack to preserve kernel<->userspace interface.
1552          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1553          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1554          * what iproute2 < v3.9.0 used.
1555          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1556          * attribute, its netlink message is shorter than struct ifinfomsg.
1557          */
1558         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1559                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1560
1561         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1562
1563                 if (tb[IFLA_EXT_MASK])
1564                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1565
1566                 if (tb[IFLA_MASTER])
1567                         master_idx = nla_get_u32(tb[IFLA_MASTER]);
1568
1569                 if (tb[IFLA_LINKINFO])
1570                         kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1571
1572                 if (master_idx || kind_ops)
1573                         flags |= NLM_F_DUMP_FILTERED;
1574         }
1575
1576         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1577                 idx = 0;
1578                 head = &net->dev_index_head[h];
1579                 hlist_for_each_entry(dev, head, index_hlist) {
1580                         if (link_dump_filtered(dev, master_idx, kind_ops))
1581                                 continue;
1582                         if (idx < s_idx)
1583                                 goto cont;
1584                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1585                                                NETLINK_CB(cb->skb).portid,
1586                                                cb->nlh->nlmsg_seq, 0,
1587                                                flags,
1588                                                ext_filter_mask);
1589                         /* If we ran out of room on the first message,
1590                          * we're in trouble
1591                          */
1592                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1593
1594                         if (err < 0)
1595                                 goto out;
1596
1597                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1598 cont:
1599                         idx++;
1600                 }
1601         }
1602 out:
1603         cb->args[1] = idx;
1604         cb->args[0] = h;
1605
1606         return skb->len;
1607 }
1608
1609 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1610 {
1611         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1612 }
1613 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1614
1615 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1616 {
1617         struct net *net;
1618         /* Examine the link attributes and figure out which
1619          * network namespace we are talking about.
1620          */
1621         if (tb[IFLA_NET_NS_PID])
1622                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1623         else if (tb[IFLA_NET_NS_FD])
1624                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1625         else
1626                 net = get_net(src_net);
1627         return net;
1628 }
1629 EXPORT_SYMBOL(rtnl_link_get_net);
1630
1631 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1632 {
1633         if (dev) {
1634                 if (tb[IFLA_ADDRESS] &&
1635                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1636                         return -EINVAL;
1637
1638                 if (tb[IFLA_BROADCAST] &&
1639                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1640                         return -EINVAL;
1641         }
1642
1643         if (tb[IFLA_AF_SPEC]) {
1644                 struct nlattr *af;
1645                 int rem, err;
1646
1647                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1648                         const struct rtnl_af_ops *af_ops;
1649
1650                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1651                                 return -EAFNOSUPPORT;
1652
1653                         if (!af_ops->set_link_af)
1654                                 return -EOPNOTSUPP;
1655
1656                         if (af_ops->validate_link_af) {
1657                                 err = af_ops->validate_link_af(dev, af);
1658                                 if (err < 0)
1659                                         return err;
1660                         }
1661                 }
1662         }
1663
1664         return 0;
1665 }
1666
1667 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
1668                                   int guid_type)
1669 {
1670         const struct net_device_ops *ops = dev->netdev_ops;
1671
1672         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
1673 }
1674
1675 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
1676 {
1677         if (dev->type != ARPHRD_INFINIBAND)
1678                 return -EOPNOTSUPP;
1679
1680         return handle_infiniband_guid(dev, ivt, guid_type);
1681 }
1682
1683 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1684 {
1685         const struct net_device_ops *ops = dev->netdev_ops;
1686         int err = -EINVAL;
1687
1688         if (tb[IFLA_VF_MAC]) {
1689                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1690
1691                 err = -EOPNOTSUPP;
1692                 if (ops->ndo_set_vf_mac)
1693                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
1694                                                   ivm->mac);
1695                 if (err < 0)
1696                         return err;
1697         }
1698
1699         if (tb[IFLA_VF_VLAN]) {
1700                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1701
1702                 err = -EOPNOTSUPP;
1703                 if (ops->ndo_set_vf_vlan)
1704                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1705                                                    ivv->qos);
1706                 if (err < 0)
1707                         return err;
1708         }
1709
1710         if (tb[IFLA_VF_TX_RATE]) {
1711                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1712                 struct ifla_vf_info ivf;
1713
1714                 err = -EOPNOTSUPP;
1715                 if (ops->ndo_get_vf_config)
1716                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1717                 if (err < 0)
1718                         return err;
1719
1720                 err = -EOPNOTSUPP;
1721                 if (ops->ndo_set_vf_rate)
1722                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1723                                                    ivf.min_tx_rate,
1724                                                    ivt->rate);
1725                 if (err < 0)
1726                         return err;
1727         }
1728
1729         if (tb[IFLA_VF_RATE]) {
1730                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1731
1732                 err = -EOPNOTSUPP;
1733                 if (ops->ndo_set_vf_rate)
1734                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1735                                                    ivt->min_tx_rate,
1736                                                    ivt->max_tx_rate);
1737                 if (err < 0)
1738                         return err;
1739         }
1740
1741         if (tb[IFLA_VF_SPOOFCHK]) {
1742                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1743
1744                 err = -EOPNOTSUPP;
1745                 if (ops->ndo_set_vf_spoofchk)
1746                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1747                                                        ivs->setting);
1748                 if (err < 0)
1749                         return err;
1750         }
1751
1752         if (tb[IFLA_VF_LINK_STATE]) {
1753                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1754
1755                 err = -EOPNOTSUPP;
1756                 if (ops->ndo_set_vf_link_state)
1757                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1758                                                          ivl->link_state);
1759                 if (err < 0)
1760                         return err;
1761         }
1762
1763         if (tb[IFLA_VF_RSS_QUERY_EN]) {
1764                 struct ifla_vf_rss_query_en *ivrssq_en;
1765
1766                 err = -EOPNOTSUPP;
1767                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1768                 if (ops->ndo_set_vf_rss_query_en)
1769                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1770                                                            ivrssq_en->setting);
1771                 if (err < 0)
1772                         return err;
1773         }
1774
1775         if (tb[IFLA_VF_TRUST]) {
1776                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1777
1778                 err = -EOPNOTSUPP;
1779                 if (ops->ndo_set_vf_trust)
1780                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1781                 if (err < 0)
1782                         return err;
1783         }
1784
1785         if (tb[IFLA_VF_IB_NODE_GUID]) {
1786                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
1787
1788                 if (!ops->ndo_set_vf_guid)
1789                         return -EOPNOTSUPP;
1790
1791                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
1792         }
1793
1794         if (tb[IFLA_VF_IB_PORT_GUID]) {
1795                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
1796
1797                 if (!ops->ndo_set_vf_guid)
1798                         return -EOPNOTSUPP;
1799
1800                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
1801         }
1802
1803         return err;
1804 }
1805
1806 static int do_set_master(struct net_device *dev, int ifindex)
1807 {
1808         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1809         const struct net_device_ops *ops;
1810         int err;
1811
1812         if (upper_dev) {
1813                 if (upper_dev->ifindex == ifindex)
1814                         return 0;
1815                 ops = upper_dev->netdev_ops;
1816                 if (ops->ndo_del_slave) {
1817                         err = ops->ndo_del_slave(upper_dev, dev);
1818                         if (err)
1819                                 return err;
1820                 } else {
1821                         return -EOPNOTSUPP;
1822                 }
1823         }
1824
1825         if (ifindex) {
1826                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1827                 if (!upper_dev)
1828                         return -EINVAL;
1829                 ops = upper_dev->netdev_ops;
1830                 if (ops->ndo_add_slave) {
1831                         err = ops->ndo_add_slave(upper_dev, dev);
1832                         if (err)
1833                                 return err;
1834                 } else {
1835                         return -EOPNOTSUPP;
1836                 }
1837         }
1838         return 0;
1839 }
1840
1841 #define DO_SETLINK_MODIFIED     0x01
1842 /* notify flag means notify + modified. */
1843 #define DO_SETLINK_NOTIFY       0x03
1844 static int do_setlink(const struct sk_buff *skb,
1845                       struct net_device *dev, struct ifinfomsg *ifm,
1846                       struct nlattr **tb, char *ifname, int status)
1847 {
1848         const struct net_device_ops *ops = dev->netdev_ops;
1849         int err;
1850
1851         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1852                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1853                 if (IS_ERR(net)) {
1854                         err = PTR_ERR(net);
1855                         goto errout;
1856                 }
1857                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1858                         put_net(net);
1859                         err = -EPERM;
1860                         goto errout;
1861                 }
1862                 err = dev_change_net_namespace(dev, net, ifname);
1863                 put_net(net);
1864                 if (err)
1865                         goto errout;
1866                 status |= DO_SETLINK_MODIFIED;
1867         }
1868
1869         if (tb[IFLA_MAP]) {
1870                 struct rtnl_link_ifmap *u_map;
1871                 struct ifmap k_map;
1872
1873                 if (!ops->ndo_set_config) {
1874                         err = -EOPNOTSUPP;
1875                         goto errout;
1876                 }
1877
1878                 if (!netif_device_present(dev)) {
1879                         err = -ENODEV;
1880                         goto errout;
1881                 }
1882
1883                 u_map = nla_data(tb[IFLA_MAP]);
1884                 k_map.mem_start = (unsigned long) u_map->mem_start;
1885                 k_map.mem_end = (unsigned long) u_map->mem_end;
1886                 k_map.base_addr = (unsigned short) u_map->base_addr;
1887                 k_map.irq = (unsigned char) u_map->irq;
1888                 k_map.dma = (unsigned char) u_map->dma;
1889                 k_map.port = (unsigned char) u_map->port;
1890
1891                 err = ops->ndo_set_config(dev, &k_map);
1892                 if (err < 0)
1893                         goto errout;
1894
1895                 status |= DO_SETLINK_NOTIFY;
1896         }
1897
1898         if (tb[IFLA_ADDRESS]) {
1899                 struct sockaddr *sa;
1900                 int len;
1901
1902                 len = sizeof(sa_family_t) + dev->addr_len;
1903                 sa = kmalloc(len, GFP_KERNEL);
1904                 if (!sa) {
1905                         err = -ENOMEM;
1906                         goto errout;
1907                 }
1908                 sa->sa_family = dev->type;
1909                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1910                        dev->addr_len);
1911                 err = dev_set_mac_address(dev, sa);
1912                 kfree(sa);
1913                 if (err)
1914                         goto errout;
1915                 status |= DO_SETLINK_MODIFIED;
1916         }
1917
1918         if (tb[IFLA_MTU]) {
1919                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1920                 if (err < 0)
1921                         goto errout;
1922                 status |= DO_SETLINK_MODIFIED;
1923         }
1924
1925         if (tb[IFLA_GROUP]) {
1926                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1927                 status |= DO_SETLINK_NOTIFY;
1928         }
1929
1930         /*
1931          * Interface selected by interface index but interface
1932          * name provided implies that a name change has been
1933          * requested.
1934          */
1935         if (ifm->ifi_index > 0 && ifname[0]) {
1936                 err = dev_change_name(dev, ifname);
1937                 if (err < 0)
1938                         goto errout;
1939                 status |= DO_SETLINK_MODIFIED;
1940         }
1941
1942         if (tb[IFLA_IFALIAS]) {
1943                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1944                                     nla_len(tb[IFLA_IFALIAS]));
1945                 if (err < 0)
1946                         goto errout;
1947                 status |= DO_SETLINK_NOTIFY;
1948         }
1949
1950         if (tb[IFLA_BROADCAST]) {
1951                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1952                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1953         }
1954
1955         if (ifm->ifi_flags || ifm->ifi_change) {
1956                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1957                 if (err < 0)
1958                         goto errout;
1959         }
1960
1961         if (tb[IFLA_MASTER]) {
1962                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1963                 if (err)
1964                         goto errout;
1965                 status |= DO_SETLINK_MODIFIED;
1966         }
1967
1968         if (tb[IFLA_CARRIER]) {
1969                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1970                 if (err)
1971                         goto errout;
1972                 status |= DO_SETLINK_MODIFIED;
1973         }
1974
1975         if (tb[IFLA_TXQLEN]) {
1976                 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1977                 unsigned long orig_len = dev->tx_queue_len;
1978
1979                 if (dev->tx_queue_len ^ value) {
1980                         dev->tx_queue_len = value;
1981                         err = call_netdevice_notifiers(
1982                               NETDEV_CHANGE_TX_QUEUE_LEN, dev);
1983                         err = notifier_to_errno(err);
1984                         if (err) {
1985                                 dev->tx_queue_len = orig_len;
1986                                 goto errout;
1987                         }
1988                         status |= DO_SETLINK_NOTIFY;
1989                 }
1990         }
1991
1992         if (tb[IFLA_OPERSTATE])
1993                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1994
1995         if (tb[IFLA_LINKMODE]) {
1996                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1997
1998                 write_lock_bh(&dev_base_lock);
1999                 if (dev->link_mode ^ value)
2000                         status |= DO_SETLINK_NOTIFY;
2001                 dev->link_mode = value;
2002                 write_unlock_bh(&dev_base_lock);
2003         }
2004
2005         if (tb[IFLA_VFINFO_LIST]) {
2006                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2007                 struct nlattr *attr;
2008                 int rem;
2009
2010                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2011                         if (nla_type(attr) != IFLA_VF_INFO ||
2012                             nla_len(attr) < NLA_HDRLEN) {
2013                                 err = -EINVAL;
2014                                 goto errout;
2015                         }
2016                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2017                                                ifla_vf_policy);
2018                         if (err < 0)
2019                                 goto errout;
2020                         err = do_setvfinfo(dev, vfinfo);
2021                         if (err < 0)
2022                                 goto errout;
2023                         status |= DO_SETLINK_NOTIFY;
2024                 }
2025         }
2026         err = 0;
2027
2028         if (tb[IFLA_VF_PORTS]) {
2029                 struct nlattr *port[IFLA_PORT_MAX+1];
2030                 struct nlattr *attr;
2031                 int vf;
2032                 int rem;
2033
2034                 err = -EOPNOTSUPP;
2035                 if (!ops->ndo_set_vf_port)
2036                         goto errout;
2037
2038                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2039                         if (nla_type(attr) != IFLA_VF_PORT ||
2040                             nla_len(attr) < NLA_HDRLEN) {
2041                                 err = -EINVAL;
2042                                 goto errout;
2043                         }
2044                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2045                                                ifla_port_policy);
2046                         if (err < 0)
2047                                 goto errout;
2048                         if (!port[IFLA_PORT_VF]) {
2049                                 err = -EOPNOTSUPP;
2050                                 goto errout;
2051                         }
2052                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2053                         err = ops->ndo_set_vf_port(dev, vf, port);
2054                         if (err < 0)
2055                                 goto errout;
2056                         status |= DO_SETLINK_NOTIFY;
2057                 }
2058         }
2059         err = 0;
2060
2061         if (tb[IFLA_PORT_SELF]) {
2062                 struct nlattr *port[IFLA_PORT_MAX+1];
2063
2064                 err = nla_parse_nested(port, IFLA_PORT_MAX,
2065                         tb[IFLA_PORT_SELF], ifla_port_policy);
2066                 if (err < 0)
2067                         goto errout;
2068
2069                 err = -EOPNOTSUPP;
2070                 if (ops->ndo_set_vf_port)
2071                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2072                 if (err < 0)
2073                         goto errout;
2074                 status |= DO_SETLINK_NOTIFY;
2075         }
2076
2077         if (tb[IFLA_AF_SPEC]) {
2078                 struct nlattr *af;
2079                 int rem;
2080
2081                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2082                         const struct rtnl_af_ops *af_ops;
2083
2084                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
2085                                 BUG();
2086
2087                         err = af_ops->set_link_af(dev, af);
2088                         if (err < 0)
2089                                 goto errout;
2090
2091                         status |= DO_SETLINK_NOTIFY;
2092                 }
2093         }
2094         err = 0;
2095
2096         if (tb[IFLA_PROTO_DOWN]) {
2097                 err = dev_change_proto_down(dev,
2098                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2099                 if (err)
2100                         goto errout;
2101                 status |= DO_SETLINK_NOTIFY;
2102         }
2103
2104         if (tb[IFLA_XDP]) {
2105                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2106
2107                 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2108                                        ifla_xdp_policy);
2109                 if (err < 0)
2110                         goto errout;
2111
2112                 if (xdp[IFLA_XDP_ATTACHED]) {
2113                         err = -EINVAL;
2114                         goto errout;
2115                 }
2116                 if (xdp[IFLA_XDP_FD]) {
2117                         err = dev_change_xdp_fd(dev,
2118                                                 nla_get_s32(xdp[IFLA_XDP_FD]));
2119                         if (err)
2120                                 goto errout;
2121                         status |= DO_SETLINK_NOTIFY;
2122                 }
2123         }
2124
2125 errout:
2126         if (status & DO_SETLINK_MODIFIED) {
2127                 if (status & DO_SETLINK_NOTIFY)
2128                         netdev_state_change(dev);
2129
2130                 if (err < 0)
2131                         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",
2132                                              dev->name);
2133         }
2134
2135         return err;
2136 }
2137
2138 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2139 {
2140         struct net *net = sock_net(skb->sk);
2141         struct ifinfomsg *ifm;
2142         struct net_device *dev;
2143         int err;
2144         struct nlattr *tb[IFLA_MAX+1];
2145         char ifname[IFNAMSIZ];
2146
2147         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2148         if (err < 0)
2149                 goto errout;
2150
2151         if (tb[IFLA_IFNAME])
2152                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2153         else
2154                 ifname[0] = '\0';
2155
2156         err = -EINVAL;
2157         ifm = nlmsg_data(nlh);
2158         if (ifm->ifi_index > 0)
2159                 dev = __dev_get_by_index(net, ifm->ifi_index);
2160         else if (tb[IFLA_IFNAME])
2161                 dev = __dev_get_by_name(net, ifname);
2162         else
2163                 goto errout;
2164
2165         if (dev == NULL) {
2166                 err = -ENODEV;
2167                 goto errout;
2168         }
2169
2170         err = validate_linkmsg(dev, tb);
2171         if (err < 0)
2172                 goto errout;
2173
2174         err = do_setlink(skb, dev, ifm, tb, ifname, 0);
2175 errout:
2176         return err;
2177 }
2178
2179 static int rtnl_group_dellink(const struct net *net, int group)
2180 {
2181         struct net_device *dev, *aux;
2182         LIST_HEAD(list_kill);
2183         bool found = false;
2184
2185         if (!group)
2186                 return -EPERM;
2187
2188         for_each_netdev(net, dev) {
2189                 if (dev->group == group) {
2190                         const struct rtnl_link_ops *ops;
2191
2192                         found = true;
2193                         ops = dev->rtnl_link_ops;
2194                         if (!ops || !ops->dellink)
2195                                 return -EOPNOTSUPP;
2196                 }
2197         }
2198
2199         if (!found)
2200                 return -ENODEV;
2201
2202         for_each_netdev_safe(net, dev, aux) {
2203                 if (dev->group == group) {
2204                         const struct rtnl_link_ops *ops;
2205
2206                         ops = dev->rtnl_link_ops;
2207                         ops->dellink(dev, &list_kill);
2208                 }
2209         }
2210         unregister_netdevice_many(&list_kill);
2211
2212         return 0;
2213 }
2214
2215 int rtnl_delete_link(struct net_device *dev)
2216 {
2217         const struct rtnl_link_ops *ops;
2218         LIST_HEAD(list_kill);
2219
2220         ops = dev->rtnl_link_ops;
2221         if (!ops || !ops->dellink)
2222                 return -EOPNOTSUPP;
2223
2224         ops->dellink(dev, &list_kill);
2225         unregister_netdevice_many(&list_kill);
2226
2227         return 0;
2228 }
2229 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2230
2231 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2232 {
2233         struct net *net = sock_net(skb->sk);
2234         struct net_device *dev;
2235         struct ifinfomsg *ifm;
2236         char ifname[IFNAMSIZ];
2237         struct nlattr *tb[IFLA_MAX+1];
2238         int err;
2239
2240         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2241         if (err < 0)
2242                 return err;
2243
2244         if (tb[IFLA_IFNAME])
2245                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2246
2247         ifm = nlmsg_data(nlh);
2248         if (ifm->ifi_index > 0)
2249                 dev = __dev_get_by_index(net, ifm->ifi_index);
2250         else if (tb[IFLA_IFNAME])
2251                 dev = __dev_get_by_name(net, ifname);
2252         else if (tb[IFLA_GROUP])
2253                 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2254         else
2255                 return -EINVAL;
2256
2257         if (!dev)
2258                 return -ENODEV;
2259
2260         return rtnl_delete_link(dev);
2261 }
2262
2263 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2264 {
2265         unsigned int old_flags;
2266         int err;
2267
2268         old_flags = dev->flags;
2269         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2270                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2271                 if (err < 0)
2272                         return err;
2273         }
2274
2275         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2276
2277         __dev_notify_flags(dev, old_flags, ~0U);
2278         return 0;
2279 }
2280 EXPORT_SYMBOL(rtnl_configure_link);
2281
2282 struct net_device *rtnl_create_link(struct net *net,
2283         const char *ifname, unsigned char name_assign_type,
2284         const struct rtnl_link_ops *ops, struct nlattr *tb[])
2285 {
2286         int err;
2287         struct net_device *dev;
2288         unsigned int num_tx_queues = 1;
2289         unsigned int num_rx_queues = 1;
2290
2291         if (tb[IFLA_NUM_TX_QUEUES])
2292                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2293         else if (ops->get_num_tx_queues)
2294                 num_tx_queues = ops->get_num_tx_queues();
2295
2296         if (tb[IFLA_NUM_RX_QUEUES])
2297                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2298         else if (ops->get_num_rx_queues)
2299                 num_rx_queues = ops->get_num_rx_queues();
2300
2301         err = -ENOMEM;
2302         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2303                                ops->setup, num_tx_queues, num_rx_queues);
2304         if (!dev)
2305                 goto err;
2306
2307         dev_net_set(dev, net);
2308         dev->rtnl_link_ops = ops;
2309         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2310
2311         if (tb[IFLA_MTU])
2312                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2313         if (tb[IFLA_ADDRESS]) {
2314                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2315                                 nla_len(tb[IFLA_ADDRESS]));
2316                 dev->addr_assign_type = NET_ADDR_SET;
2317         }
2318         if (tb[IFLA_BROADCAST])
2319                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2320                                 nla_len(tb[IFLA_BROADCAST]));
2321         if (tb[IFLA_TXQLEN])
2322                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2323         if (tb[IFLA_OPERSTATE])
2324                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2325         if (tb[IFLA_LINKMODE])
2326                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2327         if (tb[IFLA_GROUP])
2328                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2329
2330         return dev;
2331
2332 err:
2333         return ERR_PTR(err);
2334 }
2335 EXPORT_SYMBOL(rtnl_create_link);
2336
2337 static int rtnl_group_changelink(const struct sk_buff *skb,
2338                 struct net *net, int group,
2339                 struct ifinfomsg *ifm,
2340                 struct nlattr **tb)
2341 {
2342         struct net_device *dev, *aux;
2343         int err;
2344
2345         for_each_netdev_safe(net, dev, aux) {
2346                 if (dev->group == group) {
2347                         err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2348                         if (err < 0)
2349                                 return err;
2350                 }
2351         }
2352
2353         return 0;
2354 }
2355
2356 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2357 {
2358         struct net *net = sock_net(skb->sk);
2359         const struct rtnl_link_ops *ops;
2360         const struct rtnl_link_ops *m_ops = NULL;
2361         struct net_device *dev;
2362         struct net_device *master_dev = NULL;
2363         struct ifinfomsg *ifm;
2364         char kind[MODULE_NAME_LEN];
2365         char ifname[IFNAMSIZ];
2366         struct nlattr *tb[IFLA_MAX+1];
2367         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2368         unsigned char name_assign_type = NET_NAME_USER;
2369         int err;
2370
2371 #ifdef CONFIG_MODULES
2372 replay:
2373 #endif
2374         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2375         if (err < 0)
2376                 return err;
2377
2378         if (tb[IFLA_IFNAME])
2379                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2380         else
2381                 ifname[0] = '\0';
2382
2383         ifm = nlmsg_data(nlh);
2384         if (ifm->ifi_index > 0)
2385                 dev = __dev_get_by_index(net, ifm->ifi_index);
2386         else {
2387                 if (ifname[0])
2388                         dev = __dev_get_by_name(net, ifname);
2389                 else
2390                         dev = NULL;
2391         }
2392
2393         if (dev) {
2394                 master_dev = netdev_master_upper_dev_get(dev);
2395                 if (master_dev)
2396                         m_ops = master_dev->rtnl_link_ops;
2397         }
2398
2399         err = validate_linkmsg(dev, tb);
2400         if (err < 0)
2401                 return err;
2402
2403         if (tb[IFLA_LINKINFO]) {
2404                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2405                                        tb[IFLA_LINKINFO], ifla_info_policy);
2406                 if (err < 0)
2407                         return err;
2408         } else
2409                 memset(linkinfo, 0, sizeof(linkinfo));
2410
2411         if (linkinfo[IFLA_INFO_KIND]) {
2412                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2413                 ops = rtnl_link_ops_get(kind);
2414         } else {
2415                 kind[0] = '\0';
2416                 ops = NULL;
2417         }
2418
2419         if (1) {
2420                 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2421                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2422                 struct nlattr **data = NULL;
2423                 struct nlattr **slave_data = NULL;
2424                 struct net *dest_net, *link_net = NULL;
2425
2426                 if (ops) {
2427                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2428                                 err = nla_parse_nested(attr, ops->maxtype,
2429                                                        linkinfo[IFLA_INFO_DATA],
2430                                                        ops->policy);
2431                                 if (err < 0)
2432                                         return err;
2433                                 data = attr;
2434                         }
2435                         if (ops->validate) {
2436                                 err = ops->validate(tb, data);
2437                                 if (err < 0)
2438                                         return err;
2439                         }
2440                 }
2441
2442                 if (m_ops) {
2443                         if (m_ops->slave_maxtype &&
2444                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2445                                 err = nla_parse_nested(slave_attr,
2446                                                        m_ops->slave_maxtype,
2447                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2448                                                        m_ops->slave_policy);
2449                                 if (err < 0)
2450                                         return err;
2451                                 slave_data = slave_attr;
2452                         }
2453                         if (m_ops->slave_validate) {
2454                                 err = m_ops->slave_validate(tb, slave_data);
2455                                 if (err < 0)
2456                                         return err;
2457                         }
2458                 }
2459
2460                 if (dev) {
2461                         int status = 0;
2462
2463                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2464                                 return -EEXIST;
2465                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2466                                 return -EOPNOTSUPP;
2467
2468                         if (linkinfo[IFLA_INFO_DATA]) {
2469                                 if (!ops || ops != dev->rtnl_link_ops ||
2470                                     !ops->changelink)
2471                                         return -EOPNOTSUPP;
2472
2473                                 err = ops->changelink(dev, tb, data);
2474                                 if (err < 0)
2475                                         return err;
2476                                 status |= DO_SETLINK_NOTIFY;
2477                         }
2478
2479                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2480                                 if (!m_ops || !m_ops->slave_changelink)
2481                                         return -EOPNOTSUPP;
2482
2483                                 err = m_ops->slave_changelink(master_dev, dev,
2484                                                               tb, slave_data);
2485                                 if (err < 0)
2486                                         return err;
2487                                 status |= DO_SETLINK_NOTIFY;
2488                         }
2489
2490                         return do_setlink(skb, dev, ifm, tb, ifname, status);
2491                 }
2492
2493                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2494                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2495                                 return rtnl_group_changelink(skb, net,
2496                                                 nla_get_u32(tb[IFLA_GROUP]),
2497                                                 ifm, tb);
2498                         return -ENODEV;
2499                 }
2500
2501                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2502                         return -EOPNOTSUPP;
2503
2504                 if (!ops) {
2505 #ifdef CONFIG_MODULES
2506                         if (kind[0]) {
2507                                 __rtnl_unlock();
2508                                 request_module("rtnl-link-%s", kind);
2509                                 rtnl_lock();
2510                                 ops = rtnl_link_ops_get(kind);
2511                                 if (ops)
2512                                         goto replay;
2513                         }
2514 #endif
2515                         return -EOPNOTSUPP;
2516                 }
2517
2518                 if (!ops->setup)
2519                         return -EOPNOTSUPP;
2520
2521                 if (!ifname[0]) {
2522                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2523                         name_assign_type = NET_NAME_ENUM;
2524                 }
2525
2526                 dest_net = rtnl_link_get_net(net, tb);
2527                 if (IS_ERR(dest_net))
2528                         return PTR_ERR(dest_net);
2529
2530                 err = -EPERM;
2531                 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2532                         goto out;
2533
2534                 if (tb[IFLA_LINK_NETNSID]) {
2535                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2536
2537                         link_net = get_net_ns_by_id(dest_net, id);
2538                         if (!link_net) {
2539                                 err =  -EINVAL;
2540                                 goto out;
2541                         }
2542                         err = -EPERM;
2543                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2544                                 goto out;
2545                 }
2546
2547                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2548                                        name_assign_type, ops, tb);
2549                 if (IS_ERR(dev)) {
2550                         err = PTR_ERR(dev);
2551                         goto out;
2552                 }
2553
2554                 dev->ifindex = ifm->ifi_index;
2555
2556                 if (ops->newlink) {
2557                         err = ops->newlink(link_net ? : net, dev, tb, data);
2558                         /* Drivers should call free_netdev() in ->destructor
2559                          * and unregister it on failure after registration
2560                          * so that device could be finally freed in rtnl_unlock.
2561                          */
2562                         if (err < 0) {
2563                                 /* If device is not registered at all, free it now */
2564                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2565                                         free_netdev(dev);
2566                                 goto out;
2567                         }
2568                 } else {
2569                         err = register_netdevice(dev);
2570                         if (err < 0) {
2571                                 free_netdev(dev);
2572                                 goto out;
2573                         }
2574                 }
2575                 err = rtnl_configure_link(dev, ifm);
2576                 if (err < 0)
2577                         goto out_unregister;
2578                 if (link_net) {
2579                         err = dev_change_net_namespace(dev, dest_net, ifname);
2580                         if (err < 0)
2581                                 goto out_unregister;
2582                 }
2583 out:
2584                 if (link_net)
2585                         put_net(link_net);
2586                 put_net(dest_net);
2587                 return err;
2588 out_unregister:
2589                 if (ops->newlink) {
2590                         LIST_HEAD(list_kill);
2591
2592                         ops->dellink(dev, &list_kill);
2593                         unregister_netdevice_many(&list_kill);
2594                 } else {
2595                         unregister_netdevice(dev);
2596                 }
2597                 goto out;
2598         }
2599 }
2600
2601 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2602 {
2603         struct net *net = sock_net(skb->sk);
2604         struct ifinfomsg *ifm;
2605         char ifname[IFNAMSIZ];
2606         struct nlattr *tb[IFLA_MAX+1];
2607         struct net_device *dev = NULL;
2608         struct sk_buff *nskb;
2609         int err;
2610         u32 ext_filter_mask = 0;
2611
2612         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2613         if (err < 0)
2614                 return err;
2615
2616         if (tb[IFLA_IFNAME])
2617                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2618
2619         if (tb[IFLA_EXT_MASK])
2620                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2621
2622         ifm = nlmsg_data(nlh);
2623         if (ifm->ifi_index > 0)
2624                 dev = __dev_get_by_index(net, ifm->ifi_index);
2625         else if (tb[IFLA_IFNAME])
2626                 dev = __dev_get_by_name(net, ifname);
2627         else
2628                 return -EINVAL;
2629
2630         if (dev == NULL)
2631                 return -ENODEV;
2632
2633         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2634         if (nskb == NULL)
2635                 return -ENOBUFS;
2636
2637         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2638                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2639         if (err < 0) {
2640                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2641                 WARN_ON(err == -EMSGSIZE);
2642                 kfree_skb(nskb);
2643         } else
2644                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2645
2646         return err;
2647 }
2648
2649 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2650 {
2651         struct net *net = sock_net(skb->sk);
2652         struct net_device *dev;
2653         struct nlattr *tb[IFLA_MAX+1];
2654         u32 ext_filter_mask = 0;
2655         u16 min_ifinfo_dump_size = 0;
2656         int hdrlen;
2657
2658         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2659         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2660                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2661
2662         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2663                 if (tb[IFLA_EXT_MASK])
2664                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2665         }
2666
2667         if (!ext_filter_mask)
2668                 return NLMSG_GOODSIZE;
2669         /*
2670          * traverse the list of net devices and compute the minimum
2671          * buffer size based upon the filter mask.
2672          */
2673         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2674                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2675                                              if_nlmsg_size(dev,
2676                                                            ext_filter_mask));
2677         }
2678
2679         return min_ifinfo_dump_size;
2680 }
2681
2682 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2683 {
2684         int idx;
2685         int s_idx = cb->family;
2686
2687         if (s_idx == 0)
2688                 s_idx = 1;
2689         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2690                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2691                 if (idx < s_idx || idx == PF_PACKET)
2692                         continue;
2693                 if (rtnl_msg_handlers[idx] == NULL ||
2694                     rtnl_msg_handlers[idx][type].dumpit == NULL)
2695                         continue;
2696                 if (idx > s_idx) {
2697                         memset(&cb->args[0], 0, sizeof(cb->args));
2698                         cb->prev_seq = 0;
2699                         cb->seq = 0;
2700                 }
2701                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2702                         break;
2703         }
2704         cb->family = idx;
2705
2706         return skb->len;
2707 }
2708
2709 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2710                                        unsigned int change, gfp_t flags)
2711 {
2712         struct net *net = dev_net(dev);
2713         struct sk_buff *skb;
2714         int err = -ENOBUFS;
2715         size_t if_info_size;
2716
2717         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2718         if (skb == NULL)
2719                 goto errout;
2720
2721         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2722         if (err < 0) {
2723                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2724                 WARN_ON(err == -EMSGSIZE);
2725                 kfree_skb(skb);
2726                 goto errout;
2727         }
2728         return skb;
2729 errout:
2730         if (err < 0)
2731                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2732         return NULL;
2733 }
2734
2735 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2736 {
2737         struct net *net = dev_net(dev);
2738
2739         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2740 }
2741
2742 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2743                   gfp_t flags)
2744 {
2745         struct sk_buff *skb;
2746
2747         if (dev->reg_state != NETREG_REGISTERED)
2748                 return;
2749
2750         skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2751         if (skb)
2752                 rtmsg_ifinfo_send(skb, dev, flags);
2753 }
2754 EXPORT_SYMBOL(rtmsg_ifinfo);
2755
2756 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2757                                    struct net_device *dev,
2758                                    u8 *addr, u16 vid, u32 pid, u32 seq,
2759                                    int type, unsigned int flags,
2760                                    int nlflags, u16 ndm_state)
2761 {
2762         struct nlmsghdr *nlh;
2763         struct ndmsg *ndm;
2764
2765         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2766         if (!nlh)
2767                 return -EMSGSIZE;
2768
2769         ndm = nlmsg_data(nlh);
2770         ndm->ndm_family  = AF_BRIDGE;
2771         ndm->ndm_pad1    = 0;
2772         ndm->ndm_pad2    = 0;
2773         ndm->ndm_flags   = flags;
2774         ndm->ndm_type    = 0;
2775         ndm->ndm_ifindex = dev->ifindex;
2776         ndm->ndm_state   = ndm_state;
2777
2778         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2779                 goto nla_put_failure;
2780         if (vid)
2781                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2782                         goto nla_put_failure;
2783
2784         nlmsg_end(skb, nlh);
2785         return 0;
2786
2787 nla_put_failure:
2788         nlmsg_cancel(skb, nlh);
2789         return -EMSGSIZE;
2790 }
2791
2792 static inline size_t rtnl_fdb_nlmsg_size(void)
2793 {
2794         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2795 }
2796
2797 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
2798                             u16 ndm_state)
2799 {
2800         struct net *net = dev_net(dev);
2801         struct sk_buff *skb;
2802         int err = -ENOBUFS;
2803
2804         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2805         if (!skb)
2806                 goto errout;
2807
2808         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2809                                       0, 0, type, NTF_SELF, 0, ndm_state);
2810         if (err < 0) {
2811                 kfree_skb(skb);
2812                 goto errout;
2813         }
2814
2815         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2816         return;
2817 errout:
2818         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2819 }
2820
2821 /**
2822  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2823  */
2824 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2825                      struct nlattr *tb[],
2826                      struct net_device *dev,
2827                      const unsigned char *addr, u16 vid,
2828                      u16 flags)
2829 {
2830         int err = -EINVAL;
2831
2832         /* If aging addresses are supported device will need to
2833          * implement its own handler for this.
2834          */
2835         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2836                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2837                 return err;
2838         }
2839
2840         if (vid) {
2841                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2842                 return err;
2843         }
2844
2845         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2846                 err = dev_uc_add_excl(dev, addr);
2847         else if (is_multicast_ether_addr(addr))
2848                 err = dev_mc_add_excl(dev, addr);
2849
2850         /* Only return duplicate errors if NLM_F_EXCL is set */
2851         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2852                 err = 0;
2853
2854         return err;
2855 }
2856 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2857
2858 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2859 {
2860         u16 vid = 0;
2861
2862         if (vlan_attr) {
2863                 if (nla_len(vlan_attr) != sizeof(u16)) {
2864                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2865                         return -EINVAL;
2866                 }
2867
2868                 vid = nla_get_u16(vlan_attr);
2869
2870                 if (!vid || vid >= VLAN_VID_MASK) {
2871                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2872                                 vid);
2873                         return -EINVAL;
2874                 }
2875         }
2876         *p_vid = vid;
2877         return 0;
2878 }
2879
2880 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2881 {
2882         struct net *net = sock_net(skb->sk);
2883         struct ndmsg *ndm;
2884         struct nlattr *tb[NDA_MAX+1];
2885         struct net_device *dev;
2886         u8 *addr;
2887         u16 vid;
2888         int err;
2889
2890         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2891         if (err < 0)
2892                 return err;
2893
2894         ndm = nlmsg_data(nlh);
2895         if (ndm->ndm_ifindex == 0) {
2896                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2897                 return -EINVAL;
2898         }
2899
2900         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2901         if (dev == NULL) {
2902                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2903                 return -ENODEV;
2904         }
2905
2906         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2907                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2908                 return -EINVAL;
2909         }
2910
2911         addr = nla_data(tb[NDA_LLADDR]);
2912
2913         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2914         if (err)
2915                 return err;
2916
2917         err = -EOPNOTSUPP;
2918
2919         /* Support fdb on master device the net/bridge default case */
2920         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2921             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2922                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2923                 const struct net_device_ops *ops = br_dev->netdev_ops;
2924
2925                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2926                                        nlh->nlmsg_flags);
2927                 if (err)
2928                         goto out;
2929                 else
2930                         ndm->ndm_flags &= ~NTF_MASTER;
2931         }
2932
2933         /* Embedded bridge, macvlan, and any other device support */
2934         if ((ndm->ndm_flags & NTF_SELF)) {
2935                 if (dev->netdev_ops->ndo_fdb_add)
2936                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2937                                                            vid,
2938                                                            nlh->nlmsg_flags);
2939                 else
2940                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2941                                                nlh->nlmsg_flags);
2942
2943                 if (!err) {
2944                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
2945                                         ndm->ndm_state);
2946                         ndm->ndm_flags &= ~NTF_SELF;
2947                 }
2948         }
2949 out:
2950         return err;
2951 }
2952
2953 /**
2954  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2955  */
2956 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2957                      struct nlattr *tb[],
2958                      struct net_device *dev,
2959                      const unsigned char *addr, u16 vid)
2960 {
2961         int err = -EINVAL;
2962
2963         /* If aging addresses are supported device will need to
2964          * implement its own handler for this.
2965          */
2966         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2967                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2968                 return err;
2969         }
2970
2971         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2972                 err = dev_uc_del(dev, addr);
2973         else if (is_multicast_ether_addr(addr))
2974                 err = dev_mc_del(dev, addr);
2975
2976         return err;
2977 }
2978 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2979
2980 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2981 {
2982         struct net *net = sock_net(skb->sk);
2983         struct ndmsg *ndm;
2984         struct nlattr *tb[NDA_MAX+1];
2985         struct net_device *dev;
2986         int err = -EINVAL;
2987         __u8 *addr;
2988         u16 vid;
2989
2990         if (!netlink_capable(skb, CAP_NET_ADMIN))
2991                 return -EPERM;
2992
2993         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2994         if (err < 0)
2995                 return err;
2996
2997         ndm = nlmsg_data(nlh);
2998         if (ndm->ndm_ifindex == 0) {
2999                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
3000                 return -EINVAL;
3001         }
3002
3003         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3004         if (dev == NULL) {
3005                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
3006                 return -ENODEV;
3007         }
3008
3009         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3010                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
3011                 return -EINVAL;
3012         }
3013
3014         addr = nla_data(tb[NDA_LLADDR]);
3015
3016         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
3017         if (err)
3018                 return err;
3019
3020         err = -EOPNOTSUPP;
3021
3022         /* Support fdb on master device the net/bridge default case */
3023         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3024             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3025                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3026                 const struct net_device_ops *ops = br_dev->netdev_ops;
3027
3028                 if (ops->ndo_fdb_del)
3029                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3030
3031                 if (err)
3032                         goto out;
3033                 else
3034                         ndm->ndm_flags &= ~NTF_MASTER;
3035         }
3036
3037         /* Embedded bridge, macvlan, and any other device support */
3038         if (ndm->ndm_flags & NTF_SELF) {
3039                 if (dev->netdev_ops->ndo_fdb_del)
3040                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3041                                                            vid);
3042                 else
3043                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3044
3045                 if (!err) {
3046                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3047                                         ndm->ndm_state);
3048                         ndm->ndm_flags &= ~NTF_SELF;
3049                 }
3050         }
3051 out:
3052         return err;
3053 }
3054
3055 static int nlmsg_populate_fdb(struct sk_buff *skb,
3056                               struct netlink_callback *cb,
3057                               struct net_device *dev,
3058                               int *idx,
3059                               struct netdev_hw_addr_list *list)
3060 {
3061         struct netdev_hw_addr *ha;
3062         int err;
3063         u32 portid, seq;
3064
3065         portid = NETLINK_CB(cb->skb).portid;
3066         seq = cb->nlh->nlmsg_seq;
3067
3068         list_for_each_entry(ha, &list->list, list) {
3069                 if (*idx < cb->args[0])
3070                         goto skip;
3071
3072                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3073                                               portid, seq,
3074                                               RTM_NEWNEIGH, NTF_SELF,
3075                                               NLM_F_MULTI, NUD_PERMANENT);
3076                 if (err < 0)
3077                         return err;
3078 skip:
3079                 *idx += 1;
3080         }
3081         return 0;
3082 }
3083
3084 /**
3085  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3086  * @nlh: netlink message header
3087  * @dev: netdevice
3088  *
3089  * Default netdevice operation to dump the existing unicast address list.
3090  * Returns number of addresses from list put in skb.
3091  */
3092 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3093                       struct netlink_callback *cb,
3094                       struct net_device *dev,
3095                       struct net_device *filter_dev,
3096                       int idx)
3097 {
3098         int err;
3099
3100         netif_addr_lock_bh(dev);
3101         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
3102         if (err)
3103                 goto out;
3104         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
3105 out:
3106         netif_addr_unlock_bh(dev);
3107         cb->args[1] = err;
3108         return idx;
3109 }
3110 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3111
3112 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3113 {
3114         struct net_device *dev;
3115         struct nlattr *tb[IFLA_MAX+1];
3116         struct net_device *br_dev = NULL;
3117         const struct net_device_ops *ops = NULL;
3118         const struct net_device_ops *cops = NULL;
3119         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3120         struct net *net = sock_net(skb->sk);
3121         int brport_idx = 0;
3122         int br_idx = 0;
3123         int idx = 0;
3124
3125         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
3126                         ifla_policy) == 0) {
3127                 if (tb[IFLA_MASTER])
3128                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
3129         }
3130
3131         brport_idx = ifm->ifi_index;
3132
3133         if (br_idx) {
3134                 br_dev = __dev_get_by_index(net, br_idx);
3135                 if (!br_dev)
3136                         return -ENODEV;
3137
3138                 ops = br_dev->netdev_ops;
3139         }
3140
3141         cb->args[1] = 0;
3142         for_each_netdev(net, dev) {
3143                 if (brport_idx && (dev->ifindex != brport_idx))
3144                         continue;
3145
3146                 if (!br_idx) { /* user did not specify a specific bridge */
3147                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
3148                                 br_dev = netdev_master_upper_dev_get(dev);
3149                                 cops = br_dev->netdev_ops;
3150                         }
3151
3152                 } else {
3153                         if (dev != br_dev &&
3154                             !(dev->priv_flags & IFF_BRIDGE_PORT))
3155                                 continue;
3156
3157                         if (br_dev != netdev_master_upper_dev_get(dev) &&
3158                             !(dev->priv_flags & IFF_EBRIDGE))
3159                                 continue;
3160
3161                         cops = ops;
3162                 }
3163
3164                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3165                         if (cops && cops->ndo_fdb_dump)
3166                                 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
3167                                                          idx);
3168                 }
3169                 if (cb->args[1] == -EMSGSIZE)
3170                         break;
3171
3172                 if (dev->netdev_ops->ndo_fdb_dump)
3173                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
3174                                                             idx);
3175                 else
3176                         idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
3177                 if (cb->args[1] == -EMSGSIZE)
3178                         break;
3179
3180                 cops = NULL;
3181         }
3182
3183         cb->args[0] = idx;
3184         return skb->len;
3185 }
3186
3187 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3188                                unsigned int attrnum, unsigned int flag)
3189 {
3190         if (mask & flag)
3191                 return nla_put_u8(skb, attrnum, !!(flags & flag));
3192         return 0;
3193 }
3194
3195 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3196                             struct net_device *dev, u16 mode,
3197                             u32 flags, u32 mask, int nlflags,
3198                             u32 filter_mask,
3199                             int (*vlan_fill)(struct sk_buff *skb,
3200                                              struct net_device *dev,
3201                                              u32 filter_mask))
3202 {
3203         struct nlmsghdr *nlh;
3204         struct ifinfomsg *ifm;
3205         struct nlattr *br_afspec;
3206         struct nlattr *protinfo;
3207         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3208         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3209         int err = 0;
3210
3211         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3212         if (nlh == NULL)
3213                 return -EMSGSIZE;
3214
3215         ifm = nlmsg_data(nlh);
3216         ifm->ifi_family = AF_BRIDGE;
3217         ifm->__ifi_pad = 0;
3218         ifm->ifi_type = dev->type;
3219         ifm->ifi_index = dev->ifindex;
3220         ifm->ifi_flags = dev_get_flags(dev);
3221         ifm->ifi_change = 0;
3222
3223
3224         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3225             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3226             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3227             (br_dev &&
3228              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3229             (dev->addr_len &&
3230              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3231             (dev->ifindex != dev_get_iflink(dev) &&
3232              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3233                 goto nla_put_failure;
3234
3235         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3236         if (!br_afspec)
3237                 goto nla_put_failure;
3238
3239         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3240                 nla_nest_cancel(skb, br_afspec);
3241                 goto nla_put_failure;
3242         }
3243
3244         if (mode != BRIDGE_MODE_UNDEF) {
3245                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3246                         nla_nest_cancel(skb, br_afspec);
3247                         goto nla_put_failure;
3248                 }
3249         }
3250         if (vlan_fill) {
3251                 err = vlan_fill(skb, dev, filter_mask);
3252                 if (err) {
3253                         nla_nest_cancel(skb, br_afspec);
3254                         goto nla_put_failure;
3255                 }
3256         }
3257         nla_nest_end(skb, br_afspec);
3258
3259         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3260         if (!protinfo)
3261                 goto nla_put_failure;
3262
3263         if (brport_nla_put_flag(skb, flags, mask,
3264                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3265             brport_nla_put_flag(skb, flags, mask,
3266                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3267             brport_nla_put_flag(skb, flags, mask,
3268                                 IFLA_BRPORT_FAST_LEAVE,
3269                                 BR_MULTICAST_FAST_LEAVE) ||
3270             brport_nla_put_flag(skb, flags, mask,
3271                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3272             brport_nla_put_flag(skb, flags, mask,
3273                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3274             brport_nla_put_flag(skb, flags, mask,
3275                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3276             brport_nla_put_flag(skb, flags, mask,
3277                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3278             brport_nla_put_flag(skb, flags, mask,
3279                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3280                 nla_nest_cancel(skb, protinfo);
3281                 goto nla_put_failure;
3282         }
3283
3284         nla_nest_end(skb, protinfo);
3285
3286         nlmsg_end(skb, nlh);
3287         return 0;
3288 nla_put_failure:
3289         nlmsg_cancel(skb, nlh);
3290         return err ? err : -EMSGSIZE;
3291 }
3292 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3293
3294 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3295 {
3296         struct net *net = sock_net(skb->sk);
3297         struct net_device *dev;
3298         int idx = 0;
3299         u32 portid = NETLINK_CB(cb->skb).portid;
3300         u32 seq = cb->nlh->nlmsg_seq;
3301         u32 filter_mask = 0;
3302         int err;
3303
3304         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3305                 struct nlattr *extfilt;
3306
3307                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3308                                           IFLA_EXT_MASK);
3309                 if (extfilt) {
3310                         if (nla_len(extfilt) < sizeof(filter_mask))
3311                                 return -EINVAL;
3312
3313                         filter_mask = nla_get_u32(extfilt);
3314                 }
3315         }
3316
3317         rcu_read_lock();
3318         for_each_netdev_rcu(net, dev) {
3319                 const struct net_device_ops *ops = dev->netdev_ops;
3320                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3321
3322                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3323                         if (idx >= cb->args[0]) {
3324                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
3325                                                 skb, portid, seq, dev,
3326                                                 filter_mask, NLM_F_MULTI);
3327                                 if (err < 0 && err != -EOPNOTSUPP)
3328                                         break;
3329                         }
3330                         idx++;
3331                 }
3332
3333                 if (ops->ndo_bridge_getlink) {
3334                         if (idx >= cb->args[0]) {
3335                                 err = ops->ndo_bridge_getlink(skb, portid,
3336                                                               seq, dev,
3337                                                               filter_mask,
3338                                                               NLM_F_MULTI);
3339                                 if (err < 0 && err != -EOPNOTSUPP)
3340                                         break;
3341                         }
3342                         idx++;
3343                 }
3344         }
3345         rcu_read_unlock();
3346         cb->args[0] = idx;
3347
3348         return skb->len;
3349 }
3350
3351 static inline size_t bridge_nlmsg_size(void)
3352 {
3353         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3354                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
3355                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
3356                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
3357                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
3358                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
3359                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
3360                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
3361                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3362                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
3363                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
3364 }
3365
3366 static int rtnl_bridge_notify(struct net_device *dev)
3367 {
3368         struct net *net = dev_net(dev);
3369         struct sk_buff *skb;
3370         int err = -EOPNOTSUPP;
3371
3372         if (!dev->netdev_ops->ndo_bridge_getlink)
3373                 return 0;
3374
3375         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3376         if (!skb) {
3377                 err = -ENOMEM;
3378                 goto errout;
3379         }
3380
3381         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3382         if (err < 0)
3383                 goto errout;
3384
3385         if (!skb->len)
3386                 goto errout;
3387
3388         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3389         return 0;
3390 errout:
3391         WARN_ON(err == -EMSGSIZE);
3392         kfree_skb(skb);
3393         if (err)
3394                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3395         return err;
3396 }
3397
3398 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3399 {
3400         struct net *net = sock_net(skb->sk);
3401         struct ifinfomsg *ifm;
3402         struct net_device *dev;
3403         struct nlattr *br_spec, *attr = NULL;
3404         int rem, err = -EOPNOTSUPP;
3405         u16 flags = 0;
3406         bool have_flags = false;
3407
3408         if (nlmsg_len(nlh) < sizeof(*ifm))
3409                 return -EINVAL;
3410
3411         ifm = nlmsg_data(nlh);
3412         if (ifm->ifi_family != AF_BRIDGE)
3413                 return -EPFNOSUPPORT;
3414
3415         dev = __dev_get_by_index(net, ifm->ifi_index);
3416         if (!dev) {
3417                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3418                 return -ENODEV;
3419         }
3420
3421         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3422         if (br_spec) {
3423                 nla_for_each_nested(attr, br_spec, rem) {
3424                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3425                                 if (nla_len(attr) < sizeof(flags))
3426                                         return -EINVAL;
3427
3428                                 have_flags = true;
3429                                 flags = nla_get_u16(attr);
3430                                 break;
3431                         }
3432                 }
3433         }
3434
3435         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3436                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3437
3438                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3439                         err = -EOPNOTSUPP;
3440                         goto out;
3441                 }
3442
3443                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3444                 if (err)
3445                         goto out;
3446
3447                 flags &= ~BRIDGE_FLAGS_MASTER;
3448         }
3449
3450         if ((flags & BRIDGE_FLAGS_SELF)) {
3451                 if (!dev->netdev_ops->ndo_bridge_setlink)
3452                         err = -EOPNOTSUPP;
3453                 else
3454                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3455                                                                   flags);
3456                 if (!err) {
3457                         flags &= ~BRIDGE_FLAGS_SELF;
3458
3459                         /* Generate event to notify upper layer of bridge
3460                          * change
3461                          */
3462                         err = rtnl_bridge_notify(dev);
3463                 }
3464         }
3465
3466         if (have_flags)
3467                 memcpy(nla_data(attr), &flags, sizeof(flags));
3468 out:
3469         return err;
3470 }
3471
3472 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3473 {
3474         struct net *net = sock_net(skb->sk);
3475         struct ifinfomsg *ifm;
3476         struct net_device *dev;
3477         struct nlattr *br_spec, *attr = NULL;
3478         int rem, err = -EOPNOTSUPP;
3479         u16 flags = 0;
3480         bool have_flags = false;
3481
3482         if (nlmsg_len(nlh) < sizeof(*ifm))
3483                 return -EINVAL;
3484
3485         ifm = nlmsg_data(nlh);
3486         if (ifm->ifi_family != AF_BRIDGE)
3487                 return -EPFNOSUPPORT;
3488
3489         dev = __dev_get_by_index(net, ifm->ifi_index);
3490         if (!dev) {
3491                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3492                 return -ENODEV;
3493         }
3494
3495         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3496         if (br_spec) {
3497                 nla_for_each_nested(attr, br_spec, rem) {
3498                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3499                                 if (nla_len(attr) < sizeof(flags))
3500                                         return -EINVAL;
3501
3502                                 have_flags = true;
3503                                 flags = nla_get_u16(attr);
3504                                 break;
3505                         }
3506                 }
3507         }
3508
3509         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3510                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3511
3512                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3513                         err = -EOPNOTSUPP;
3514                         goto out;
3515                 }
3516
3517                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3518                 if (err)
3519                         goto out;
3520
3521                 flags &= ~BRIDGE_FLAGS_MASTER;
3522         }
3523
3524         if ((flags & BRIDGE_FLAGS_SELF)) {
3525                 if (!dev->netdev_ops->ndo_bridge_dellink)
3526                         err = -EOPNOTSUPP;
3527                 else
3528                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3529                                                                   flags);
3530
3531                 if (!err) {
3532                         flags &= ~BRIDGE_FLAGS_SELF;
3533
3534                         /* Generate event to notify upper layer of bridge
3535                          * change
3536                          */
3537                         err = rtnl_bridge_notify(dev);
3538                 }
3539         }
3540
3541         if (have_flags)
3542                 memcpy(nla_data(attr), &flags, sizeof(flags));
3543 out:
3544         return err;
3545 }
3546
3547 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
3548 {
3549         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
3550                (!idxattr || idxattr == attrid);
3551 }
3552
3553 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
3554                                int type, u32 pid, u32 seq, u32 change,
3555                                unsigned int flags, unsigned int filter_mask,
3556                                int *idxattr, int *prividx)
3557 {
3558         struct if_stats_msg *ifsm;
3559         struct nlmsghdr *nlh;
3560         struct nlattr *attr;
3561         int s_prividx = *prividx;
3562
3563         ASSERT_RTNL();
3564
3565         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
3566         if (!nlh)
3567                 return -EMSGSIZE;
3568
3569         ifsm = nlmsg_data(nlh);
3570         ifsm->ifindex = dev->ifindex;
3571         ifsm->filter_mask = filter_mask;
3572
3573         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
3574                 struct rtnl_link_stats64 *sp;
3575
3576                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
3577                                          sizeof(struct rtnl_link_stats64),
3578                                          IFLA_STATS_UNSPEC);
3579                 if (!attr)
3580                         goto nla_put_failure;
3581
3582                 sp = nla_data(attr);
3583                 dev_get_stats(dev, sp);
3584         }
3585
3586         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
3587                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3588
3589                 if (ops && ops->fill_linkxstats) {
3590                         int err;
3591
3592                         *idxattr = IFLA_STATS_LINK_XSTATS;
3593                         attr = nla_nest_start(skb,
3594                                               IFLA_STATS_LINK_XSTATS);
3595                         if (!attr)
3596                                 goto nla_put_failure;
3597
3598                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3599                         nla_nest_end(skb, attr);
3600                         if (err)
3601                                 goto nla_put_failure;
3602                         *idxattr = 0;
3603                 }
3604         }
3605
3606         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
3607                              *idxattr)) {
3608                 const struct rtnl_link_ops *ops = NULL;
3609                 const struct net_device *master;
3610
3611                 master = netdev_master_upper_dev_get(dev);
3612                 if (master)
3613                         ops = master->rtnl_link_ops;
3614                 if (ops && ops->fill_linkxstats) {
3615                         int err;
3616
3617                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
3618                         attr = nla_nest_start(skb,
3619                                               IFLA_STATS_LINK_XSTATS_SLAVE);
3620                         if (!attr)
3621                                 goto nla_put_failure;
3622
3623                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3624                         nla_nest_end(skb, attr);
3625                         if (err)
3626                                 goto nla_put_failure;
3627                         *idxattr = 0;
3628                 }
3629         }
3630
3631         nlmsg_end(skb, nlh);
3632
3633         return 0;
3634
3635 nla_put_failure:
3636         /* not a multi message or no progress mean a real error */
3637         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
3638                 nlmsg_cancel(skb, nlh);
3639         else
3640                 nlmsg_end(skb, nlh);
3641
3642         return -EMSGSIZE;
3643 }
3644
3645 static const struct nla_policy ifla_stats_policy[IFLA_STATS_MAX + 1] = {
3646         [IFLA_STATS_LINK_64]    = { .len = sizeof(struct rtnl_link_stats64) },
3647 };
3648
3649 static size_t if_nlmsg_stats_size(const struct net_device *dev,
3650                                   u32 filter_mask)
3651 {
3652         size_t size = 0;
3653
3654         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
3655                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
3656
3657         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
3658                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3659                 int attr = IFLA_STATS_LINK_XSTATS;
3660
3661                 if (ops && ops->get_linkxstats_size) {
3662                         size += nla_total_size(ops->get_linkxstats_size(dev,
3663                                                                         attr));
3664                         /* for IFLA_STATS_LINK_XSTATS */
3665                         size += nla_total_size(0);
3666                 }
3667         }
3668
3669         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
3670                 struct net_device *_dev = (struct net_device *)dev;
3671                 const struct rtnl_link_ops *ops = NULL;
3672                 const struct net_device *master;
3673
3674                 /* netdev_master_upper_dev_get can't take const */
3675                 master = netdev_master_upper_dev_get(_dev);
3676                 if (master)
3677                         ops = master->rtnl_link_ops;
3678                 if (ops && ops->get_linkxstats_size) {
3679                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
3680
3681                         size += nla_total_size(ops->get_linkxstats_size(dev,
3682                                                                         attr));
3683                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
3684                         size += nla_total_size(0);
3685                 }
3686         }
3687
3688         return size;
3689 }
3690
3691 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh)
3692 {
3693         struct net *net = sock_net(skb->sk);
3694         struct net_device *dev = NULL;
3695         int idxattr = 0, prividx = 0;
3696         struct if_stats_msg *ifsm;
3697         struct sk_buff *nskb;
3698         u32 filter_mask;
3699         int err;
3700
3701         ifsm = nlmsg_data(nlh);
3702         if (ifsm->ifindex > 0)
3703                 dev = __dev_get_by_index(net, ifsm->ifindex);
3704         else
3705                 return -EINVAL;
3706
3707         if (!dev)
3708                 return -ENODEV;
3709
3710         filter_mask = ifsm->filter_mask;
3711         if (!filter_mask)
3712                 return -EINVAL;
3713
3714         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
3715         if (!nskb)
3716                 return -ENOBUFS;
3717
3718         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
3719                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
3720                                   0, filter_mask, &idxattr, &prividx);
3721         if (err < 0) {
3722                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
3723                 WARN_ON(err == -EMSGSIZE);
3724                 kfree_skb(nskb);
3725         } else {
3726                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3727         }
3728
3729         return err;
3730 }
3731
3732 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
3733 {
3734         int h, s_h, err, s_idx, s_idxattr, s_prividx;
3735         struct net *net = sock_net(skb->sk);
3736         unsigned int flags = NLM_F_MULTI;
3737         struct if_stats_msg *ifsm;
3738         struct hlist_head *head;
3739         struct net_device *dev;
3740         u32 filter_mask = 0;
3741         int idx = 0;
3742
3743         s_h = cb->args[0];
3744         s_idx = cb->args[1];
3745         s_idxattr = cb->args[2];
3746         s_prividx = cb->args[3];
3747
3748         cb->seq = net->dev_base_seq;
3749
3750         ifsm = nlmsg_data(cb->nlh);
3751         filter_mask = ifsm->filter_mask;
3752         if (!filter_mask)
3753                 return -EINVAL;
3754
3755         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3756                 idx = 0;
3757                 head = &net->dev_index_head[h];
3758                 hlist_for_each_entry(dev, head, index_hlist) {
3759                         if (idx < s_idx)
3760                                 goto cont;
3761                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
3762                                                   NETLINK_CB(cb->skb).portid,
3763                                                   cb->nlh->nlmsg_seq, 0,
3764                                                   flags, filter_mask,
3765                                                   &s_idxattr, &s_prividx);
3766                         /* If we ran out of room on the first message,
3767                          * we're in trouble
3768                          */
3769                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
3770
3771                         if (err < 0)
3772                                 goto out;
3773                         s_prividx = 0;
3774                         s_idxattr = 0;
3775                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3776 cont:
3777                         idx++;
3778                 }
3779         }
3780 out:
3781         cb->args[3] = s_prividx;
3782         cb->args[2] = s_idxattr;
3783         cb->args[1] = idx;
3784         cb->args[0] = h;
3785
3786         return skb->len;
3787 }
3788
3789 /* Process one rtnetlink message. */
3790
3791 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3792 {
3793         struct net *net = sock_net(skb->sk);
3794         rtnl_doit_func doit;
3795         int kind;
3796         int family;
3797         int type;
3798         int err;
3799
3800         type = nlh->nlmsg_type;
3801         if (type > RTM_MAX)
3802                 return -EOPNOTSUPP;
3803
3804         type -= RTM_BASE;
3805
3806         /* All the messages must have at least 1 byte length */
3807         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3808                 return 0;
3809
3810         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3811         kind = type&3;
3812
3813         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3814                 return -EPERM;
3815
3816         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3817                 struct sock *rtnl;
3818                 rtnl_dumpit_func dumpit;
3819                 rtnl_calcit_func calcit;
3820                 u16 min_dump_alloc = 0;
3821
3822                 dumpit = rtnl_get_dumpit(family, type);
3823                 if (dumpit == NULL)
3824                         return -EOPNOTSUPP;
3825                 calcit = rtnl_get_calcit(family, type);
3826                 if (calcit)
3827                         min_dump_alloc = calcit(skb, nlh);
3828
3829                 __rtnl_unlock();
3830                 rtnl = net->rtnl;
3831                 {
3832                         struct netlink_dump_control c = {
3833                                 .dump           = dumpit,
3834                                 .min_dump_alloc = min_dump_alloc,
3835                         };
3836                         err = netlink_dump_start(rtnl, skb, nlh, &c);
3837                 }
3838                 rtnl_lock();
3839                 return err;
3840         }
3841
3842         doit = rtnl_get_doit(family, type);
3843         if (doit == NULL)
3844                 return -EOPNOTSUPP;
3845
3846         return doit(skb, nlh);
3847 }
3848
3849 static void rtnetlink_rcv(struct sk_buff *skb)
3850 {
3851         rtnl_lock();
3852         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3853         rtnl_unlock();
3854 }
3855
3856 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3857 {
3858         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3859
3860         switch (event) {
3861         case NETDEV_UP:
3862         case NETDEV_DOWN:
3863         case NETDEV_PRE_UP:
3864         case NETDEV_POST_INIT:
3865         case NETDEV_REGISTER:
3866         case NETDEV_CHANGE:
3867         case NETDEV_PRE_TYPE_CHANGE:
3868         case NETDEV_GOING_DOWN:
3869         case NETDEV_UNREGISTER:
3870         case NETDEV_UNREGISTER_FINAL:
3871         case NETDEV_RELEASE:
3872         case NETDEV_JOIN:
3873         case NETDEV_BONDING_INFO:
3874                 break;
3875         default:
3876                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3877                 break;
3878         }
3879         return NOTIFY_DONE;
3880 }
3881
3882 static struct notifier_block rtnetlink_dev_notifier = {
3883         .notifier_call  = rtnetlink_event,
3884 };
3885
3886
3887 static int __net_init rtnetlink_net_init(struct net *net)
3888 {
3889         struct sock *sk;
3890         struct netlink_kernel_cfg cfg = {
3891                 .groups         = RTNLGRP_MAX,
3892                 .input          = rtnetlink_rcv,
3893                 .cb_mutex       = &rtnl_mutex,
3894                 .flags          = NL_CFG_F_NONROOT_RECV,
3895         };
3896
3897         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3898         if (!sk)
3899                 return -ENOMEM;
3900         net->rtnl = sk;
3901         return 0;
3902 }
3903
3904 static void __net_exit rtnetlink_net_exit(struct net *net)
3905 {
3906         netlink_kernel_release(net->rtnl);
3907         net->rtnl = NULL;
3908 }
3909
3910 static struct pernet_operations rtnetlink_net_ops = {
3911         .init = rtnetlink_net_init,
3912         .exit = rtnetlink_net_exit,
3913 };
3914
3915 void __init rtnetlink_init(void)
3916 {
3917         if (register_pernet_subsys(&rtnetlink_net_ops))
3918                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3919
3920         register_netdevice_notifier(&rtnetlink_dev_notifier);
3921
3922         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3923                       rtnl_dump_ifinfo, rtnl_calcit);
3924         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3925         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3926         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3927
3928         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3929         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3930
3931         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3932         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3933         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3934
3935         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3936         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3937         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3938
3939         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
3940                       NULL);
3941 }