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         rtnl_msg_handlers[protocol][msgindex].calcit = NULL;
 279
 280         return 0;
 281 }
 282 EXPORT_SYMBOL_GPL(rtnl_unregister);
 283
 284 /**
 285  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 286  * @protocol : Protocol family or PF_UNSPEC
 287  *
 288  * Identical to calling rtnl_unregster() for all registered message types
 289  * of a certain protocol family.
 290  */
 291 void rtnl_unregister_all(int protocol)
 292 {
 293         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 294
 295         kfree(rtnl_msg_handlers[protocol]);
 296         rtnl_msg_handlers[protocol] = NULL;
 297 }
 298 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 299
 300 static LIST_HEAD(link_ops);
 301
 302 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 303 {
 304         const struct rtnl_link_ops *ops;
 305
 306         list_for_each_entry(ops, &link_ops, list) {
 307                 if (!strcmp(ops->kind, kind))
 308                         return ops;
 309         }
 310         return NULL;
 311 }
 312
 313 /**
 314  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 315  * @ops: struct rtnl_link_ops * to register
 316  *
 317  * The caller must hold the rtnl_mutex. This function should be used
 318  * by drivers that create devices during module initialization. It
 319  * must be called before registering the devices.
 320  *
 321  * Returns 0 on success or a negative error code.
 322  */
 323 int __rtnl_link_register(struct rtnl_link_ops *ops)
 324 {
 325         if (rtnl_link_ops_get(ops->kind))
 326                 return -EEXIST;
 327
 328         /* The check for setup is here because if ops
 329          * does not have that filled up, it is not possible
 330          * to use the ops for creating device. So do not
 331          * fill up dellink as well. That disables rtnl_dellink.
 332          */
 333         if (ops->setup && !ops->dellink)
 334                 ops->dellink = unregister_netdevice_queue;
 335
 336         list_add_tail(&ops->list, &link_ops);
 337         return 0;
 338 }
 339 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 340
 341 /**
 342  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 343  * @ops: struct rtnl_link_ops * to register
 344  *
 345  * Returns 0 on success or a negative error code.
 346  */
 347 int rtnl_link_register(struct rtnl_link_ops *ops)
 348 {
 349         int err;
 350
 351         rtnl_lock();
 352         err = __rtnl_link_register(ops);
 353         rtnl_unlock();
 354         return err;
 355 }
 356 EXPORT_SYMBOL_GPL(rtnl_link_register);
 357
 358 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 359 {
 360         struct net_device *dev;
 361         LIST_HEAD(list_kill);
 362
 363         for_each_netdev(net, dev) {
 364                 if (dev->rtnl_link_ops == ops)
 365                         ops->dellink(dev, &list_kill);
 366         }
 367         unregister_netdevice_many(&list_kill);
 368 }
 369
 370 /**
 371  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 372  * @ops: struct rtnl_link_ops * to unregister
 373  *
 374  * The caller must hold the rtnl_mutex.
 375  */
 376 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 377 {
 378         struct net *net;
 379
 380         for_each_net(net) {
 381                 __rtnl_kill_links(net, ops);
 382         }
 383         list_del(&ops->list);
 384 }
 385 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 386
 387 /* Return with the rtnl_lock held when there are no network
 388  * devices unregistering in any network namespace.
 389  */
 390 static void rtnl_lock_unregistering_all(void)
 391 {
 392         struct net *net;
 393         bool unregistering;
 394         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 395
 396         add_wait_queue(&netdev_unregistering_wq, &wait);
 397         for (;;) {
 398                 unregistering = false;
 399                 rtnl_lock();
 400                 for_each_net(net) {
 401                         if (net->dev_unreg_count > 0) {
 402                                 unregistering = true;
 403                                 break;
 404                         }
 405                 }
 406                 if (!unregistering)
 407                         break;
 408                 __rtnl_unlock();
 409
 410                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 411         }
 412         remove_wait_queue(&netdev_unregistering_wq, &wait);
 413 }
 414
 415 /**
 416  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 417  * @ops: struct rtnl_link_ops * to unregister
 418  */
 419 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 420 {
 421         /* Close the race with cleanup_net() */
 422         mutex_lock(&net_mutex);
 423         rtnl_lock_unregistering_all();
 424         __rtnl_link_unregister(ops);
 425         rtnl_unlock();
 426         mutex_unlock(&net_mutex);
 427 }
 428 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 429
 430 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 431 {
 432         struct net_device *master_dev;
 433         const struct rtnl_link_ops *ops;
 434
 435         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 436         if (!master_dev)
 437                 return 0;
 438         ops = master_dev->rtnl_link_ops;
 439         if (!ops || !ops->get_slave_size)
 440                 return 0;
 441         /* IFLA_INFO_SLAVE_DATA + nested data */
 442         return nla_total_size(sizeof(struct nlattr)) +
 443                ops->get_slave_size(master_dev, dev);
 444 }
 445
 446 static size_t rtnl_link_get_size(const struct net_device *dev)
 447 {
 448         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 449         size_t size;
 450
 451         if (!ops)
 452                 return 0;
 453
 454         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 455                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 456
 457         if (ops->get_size)
 458                 /* IFLA_INFO_DATA + nested data */
 459                 size += nla_total_size(sizeof(struct nlattr)) +
 460                         ops->get_size(dev);
 461
 462         if (ops->get_xstats_size)
 463                 /* IFLA_INFO_XSTATS */
 464                 size += nla_total_size(ops->get_xstats_size(dev));
 465
 466         size += rtnl_link_get_slave_info_data_size(dev);
 467
 468         return size;
 469 }
 470
 471 static LIST_HEAD(rtnl_af_ops);
 472
 473 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 474 {
 475         const struct rtnl_af_ops *ops;
 476
 477         list_for_each_entry(ops, &rtnl_af_ops, list) {
 478                 if (ops->family == family)
 479                         return ops;
 480         }
 481
 482         return NULL;
 483 }
 484
 485 /**
 486  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 487  * @ops: struct rtnl_af_ops * to register
 488  *
 489  * Returns 0 on success or a negative error code.
 490  */
 491 void rtnl_af_register(struct rtnl_af_ops *ops)
 492 {
 493         rtnl_lock();
 494         list_add_tail(&ops->list, &rtnl_af_ops);
 495         rtnl_unlock();
 496 }
 497 EXPORT_SYMBOL_GPL(rtnl_af_register);
 498
 499 /**
 500  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 501  * @ops: struct rtnl_af_ops * to unregister
 502  *
 503  * The caller must hold the rtnl_mutex.
 504  */
 505 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 506 {
 507         list_del(&ops->list);
 508 }
 509 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 510
 511 /**
 512  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 513  * @ops: struct rtnl_af_ops * to unregister
 514  */
 515 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 516 {
 517         rtnl_lock();
 518         __rtnl_af_unregister(ops);
 519         rtnl_unlock();
 520 }
 521 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 522
 523 static size_t rtnl_link_get_af_size(const struct net_device *dev,
 524                                     u32 ext_filter_mask)
 525 {
 526         struct rtnl_af_ops *af_ops;
 527         size_t size;
 528
 529         /* IFLA_AF_SPEC */
 530         size = nla_total_size(sizeof(struct nlattr));
 531
 532         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 533                 if (af_ops->get_link_af_size) {
 534                         /* AF_* + nested data */
 535                         size += nla_total_size(sizeof(struct nlattr)) +
 536                                 af_ops->get_link_af_size(dev, ext_filter_mask);
 537                 }
 538         }
 539
 540         return size;
 541 }
 542
 543 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 544 {
 545         struct net_device *master_dev;
 546
 547         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 548         if (master_dev && master_dev->rtnl_link_ops)
 549                 return true;
 550         return false;
 551 }
 552
 553 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 554                                      const struct net_device *dev)
 555 {
 556         struct net_device *master_dev;
 557         const struct rtnl_link_ops *ops;
 558         struct nlattr *slave_data;
 559         int err;
 560
 561         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 562         if (!master_dev)
 563                 return 0;
 564         ops = master_dev->rtnl_link_ops;
 565         if (!ops)
 566                 return 0;
 567         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 568                 return -EMSGSIZE;
 569         if (ops->fill_slave_info) {
 570                 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
 571                 if (!slave_data)
 572                         return -EMSGSIZE;
 573                 err = ops->fill_slave_info(skb, master_dev, dev);
 574                 if (err < 0)
 575                         goto err_cancel_slave_data;
 576                 nla_nest_end(skb, slave_data);
 577         }
 578         return 0;
 579
 580 err_cancel_slave_data:
 581         nla_nest_cancel(skb, slave_data);
 582         return err;
 583 }
 584
 585 static int rtnl_link_info_fill(struct sk_buff *skb,
 586                                const struct net_device *dev)
 587 {
 588         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 589         struct nlattr *data;
 590         int err;
 591
 592         if (!ops)
 593                 return 0;
 594         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 595                 return -EMSGSIZE;
 596         if (ops->fill_xstats) {
 597                 err = ops->fill_xstats(skb, dev);
 598                 if (err < 0)
 599                         return err;
 600         }
 601         if (ops->fill_info) {
 602                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 603                 if (data == NULL)
 604                         return -EMSGSIZE;
 605                 err = ops->fill_info(skb, dev);
 606                 if (err < 0)
 607                         goto err_cancel_data;
 608                 nla_nest_end(skb, data);
 609         }
 610         return 0;
 611
 612 err_cancel_data:
 613         nla_nest_cancel(skb, data);
 614         return err;
 615 }
 616
 617 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 618 {
 619         struct nlattr *linkinfo;
 620         int err = -EMSGSIZE;
 621
 622         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 623         if (linkinfo == NULL)
 624                 goto out;
 625
 626         err = rtnl_link_info_fill(skb, dev);
 627         if (err < 0)
 628                 goto err_cancel_link;
 629
 630         err = rtnl_link_slave_info_fill(skb, dev);
 631         if (err < 0)
 632                 goto err_cancel_link;
 633
 634         nla_nest_end(skb, linkinfo);
 635         return 0;
 636
 637 err_cancel_link:
 638         nla_nest_cancel(skb, linkinfo);
 639 out:
 640         return err;
 641 }
 642
 643 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 644 {
 645         struct sock *rtnl = net->rtnl;
 646         int err = 0;
 647
 648         NETLINK_CB(skb).dst_group = group;
 649         if (echo)
 650                 atomic_inc(&skb->users);
 651         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 652         if (echo)
 653                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 654         return err;
 655 }
 656
 657 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 658 {
 659         struct sock *rtnl = net->rtnl;
 660
 661         return nlmsg_unicast(rtnl, skb, pid);
 662 }
 663 EXPORT_SYMBOL(rtnl_unicast);
 664
 665 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 666                  struct nlmsghdr *nlh, gfp_t flags)
 667 {
 668         struct sock *rtnl = net->rtnl;
 669         int report = 0;
 670
 671         if (nlh)
 672                 report = nlmsg_report(nlh);
 673
 674         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 675 }
 676 EXPORT_SYMBOL(rtnl_notify);
 677
 678 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 679 {
 680         struct sock *rtnl = net->rtnl;
 681
 682         netlink_set_err(rtnl, 0, group, error);
 683 }
 684 EXPORT_SYMBOL(rtnl_set_sk_err);
 685
 686 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 687 {
 688         struct nlattr *mx;
 689         int i, valid = 0;
 690
 691         mx = nla_nest_start(skb, RTA_METRICS);
 692         if (mx == NULL)
 693                 return -ENOBUFS;
 694
 695         for (i = 0; i < RTAX_MAX; i++) {
 696                 if (metrics[i]) {
 697                         if (i == RTAX_CC_ALGO - 1) {
 698                                 char tmp[TCP_CA_NAME_MAX], *name;
 699
 700                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 701                                 if (!name)
 702                                         continue;
 703                                 if (nla_put_string(skb, i + 1, name))
 704                                         goto nla_put_failure;
 705                         } else if (i == RTAX_FEATURES - 1) {
 706                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 707
 708                                 if (!user_features)
 709                                         continue;
 710                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 711                                 if (nla_put_u32(skb, i + 1, user_features))
 712                                         goto nla_put_failure;
 713                         } else {
 714                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 715                                         goto nla_put_failure;
 716                         }
 717                         valid++;
 718                 }
 719         }
 720
 721         if (!valid) {
 722                 nla_nest_cancel(skb, mx);
 723                 return 0;
 724         }
 725
 726         return nla_nest_end(skb, mx);
 727
 728 nla_put_failure:
 729         nla_nest_cancel(skb, mx);
 730         return -EMSGSIZE;
 731 }
 732 EXPORT_SYMBOL(rtnetlink_put_metrics);
 733
 734 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 735                        long expires, u32 error)
 736 {
 737         struct rta_cacheinfo ci = {
 738                 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
 739                 .rta_used = dst->__use,
 740                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 741                 .rta_error = error,
 742                 .rta_id =  id,
 743         };
 744
 745         if (expires) {
 746                 unsigned long clock;
 747
 748                 clock = jiffies_to_clock_t(abs(expires));
 749                 clock = min_t(unsigned long, clock, INT_MAX);
 750                 ci.rta_expires = (expires > 0) ? clock : -clock;
 751         }
 752         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 753 }
 754 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 755
 756 static void set_operstate(struct net_device *dev, unsigned char transition)
 757 {
 758         unsigned char operstate = dev->operstate;
 759
 760         switch (transition) {
 761         case IF_OPER_UP:
 762                 if ((operstate == IF_OPER_DORMANT ||
 763                      operstate == IF_OPER_UNKNOWN) &&
 764                     !netif_dormant(dev))
 765                         operstate = IF_OPER_UP;
 766                 break;
 767
 768         case IF_OPER_DORMANT:
 769                 if (operstate == IF_OPER_UP ||
 770                     operstate == IF_OPER_UNKNOWN)
 771                         operstate = IF_OPER_DORMANT;
 772                 break;
 773         }
 774
 775         if (dev->operstate != operstate) {
 776                 write_lock_bh(&dev_base_lock);
 777                 dev->operstate = operstate;
 778                 write_unlock_bh(&dev_base_lock);
 779                 netdev_state_change(dev);
 780         }
 781 }
 782
 783 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 784 {
 785         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 786                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 787 }
 788
 789 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 790                                            const struct ifinfomsg *ifm)
 791 {
 792         unsigned int flags = ifm->ifi_flags;
 793
 794         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 795         if (ifm->ifi_change)
 796                 flags = (flags & ifm->ifi_change) |
 797                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 798
 799         return flags;
 800 }
 801
 802 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 803                                  const struct rtnl_link_stats64 *b)
 804 {
 805         a->rx_packets = b->rx_packets;
 806         a->tx_packets = b->tx_packets;
 807         a->rx_bytes = b->rx_bytes;
 808         a->tx_bytes = b->tx_bytes;
 809         a->rx_errors = b->rx_errors;
 810         a->tx_errors = b->tx_errors;
 811         a->rx_dropped = b->rx_dropped;
 812         a->tx_dropped = b->tx_dropped;
 813
 814         a->multicast = b->multicast;
 815         a->collisions = b->collisions;
 816
 817         a->rx_length_errors = b->rx_length_errors;
 818         a->rx_over_errors = b->rx_over_errors;
 819         a->rx_crc_errors = b->rx_crc_errors;
 820         a->rx_frame_errors = b->rx_frame_errors;
 821         a->rx_fifo_errors = b->rx_fifo_errors;
 822         a->rx_missed_errors = b->rx_missed_errors;
 823
 824         a->tx_aborted_errors = b->tx_aborted_errors;
 825         a->tx_carrier_errors = b->tx_carrier_errors;
 826         a->tx_fifo_errors = b->tx_fifo_errors;
 827         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 828         a->tx_window_errors = b->tx_window_errors;
 829
 830         a->rx_compressed = b->rx_compressed;
 831         a->tx_compressed = b->tx_compressed;
 832
 833         a->rx_nohandler = b->rx_nohandler;
 834 }
 835
 836 /* All VF info */
 837 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 838                                    u32 ext_filter_mask)
 839 {
 840         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 841             (ext_filter_mask & RTEXT_FILTER_VF)) {
 842                 int num_vfs = dev_num_vf(dev->dev.parent);
 843                 size_t size = nla_total_size(0);
 844                 size += num_vfs *
 845                         (nla_total_size(0) +
 846                          nla_total_size(sizeof(struct ifla_vf_mac)) +
 847                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 848                          nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
 849                          nla_total_size(MAX_VLAN_LIST_LEN *
 850                                         sizeof(struct ifla_vf_vlan_info)) +
 851                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 852                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 853                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 854                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 855                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 856                          nla_total_size(0) + /* nest IFLA_VF_STATS */
 857                          /* IFLA_VF_STATS_RX_PACKETS */
 858                          nla_total_size_64bit(sizeof(__u64)) +
 859                          /* IFLA_VF_STATS_TX_PACKETS */
 860                          nla_total_size_64bit(sizeof(__u64)) +
 861                          /* IFLA_VF_STATS_RX_BYTES */
 862                          nla_total_size_64bit(sizeof(__u64)) +
 863                          /* IFLA_VF_STATS_TX_BYTES */
 864                          nla_total_size_64bit(sizeof(__u64)) +
 865                          /* IFLA_VF_STATS_BROADCAST */
 866                          nla_total_size_64bit(sizeof(__u64)) +
 867                          /* IFLA_VF_STATS_MULTICAST */
 868                          nla_total_size_64bit(sizeof(__u64)) +
 869                          nla_total_size(sizeof(struct ifla_vf_trust)));
 870                 return size;
 871         } else
 872                 return 0;
 873 }
 874
 875 static size_t rtnl_port_size(const struct net_device *dev,
 876                              u32 ext_filter_mask)
 877 {
 878         size_t port_size = nla_total_size(4)            /* PORT_VF */
 879                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 880                 + nla_total_size(sizeof(struct ifla_port_vsi))
 881                                                         /* PORT_VSI_TYPE */
 882                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 883                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 884                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 885                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 886         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 887         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 888                 + port_size;
 889         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 890                 + port_size;
 891
 892         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 893             !(ext_filter_mask & RTEXT_FILTER_VF))
 894                 return 0;
 895         if (dev_num_vf(dev->dev.parent))
 896                 return port_self_size + vf_ports_size +
 897                         vf_port_size * dev_num_vf(dev->dev.parent);
 898         else
 899                 return port_self_size;
 900 }
 901
 902 static size_t rtnl_xdp_size(const struct net_device *dev)
 903 {
 904         size_t xdp_size = nla_total_size(1);    /* XDP_ATTACHED */
 905
 906         if (!dev->netdev_ops->ndo_xdp)
 907                 return 0;
 908         else
 909                 return xdp_size;
 910 }
 911
 912 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 913                                      u32 ext_filter_mask)
 914 {
 915         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 916                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 917                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 918                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 919                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
 920                + nla_total_size(sizeof(struct rtnl_link_stats))
 921                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
 922                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 923                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 924                + nla_total_size(4) /* IFLA_TXQLEN */
 925                + nla_total_size(4) /* IFLA_WEIGHT */
 926                + nla_total_size(4) /* IFLA_MTU */
 927                + nla_total_size(4) /* IFLA_LINK */
 928                + nla_total_size(4) /* IFLA_MASTER */
 929                + nla_total_size(1) /* IFLA_CARRIER */
 930                + nla_total_size(4) /* IFLA_PROMISCUITY */
 931                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 932                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 933                + nla_total_size(4) /* IFLA_MAX_GSO_SEGS */
 934                + nla_total_size(4) /* IFLA_MAX_GSO_SIZE */
 935                + nla_total_size(1) /* IFLA_OPERSTATE */
 936                + nla_total_size(1) /* IFLA_LINKMODE */
 937                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
 938                + nla_total_size(4) /* IFLA_LINK_NETNSID */
 939                + nla_total_size(ext_filter_mask
 940                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 941                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 942                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 943                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 944                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
 945                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
 946                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
 947                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
 948                + rtnl_xdp_size(dev) /* IFLA_XDP */
 949                + nla_total_size(1); /* IFLA_PROTO_DOWN */
 950
 951 }
 952
 953 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 954 {
 955         struct nlattr *vf_ports;
 956         struct nlattr *vf_port;
 957         int vf;
 958         int err;
 959
 960         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 961         if (!vf_ports)
 962                 return -EMSGSIZE;
 963
 964         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 965                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 966                 if (!vf_port)
 967                         goto nla_put_failure;
 968                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 969                         goto nla_put_failure;
 970                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 971                 if (err == -EMSGSIZE)
 972                         goto nla_put_failure;
 973                 if (err) {
 974                         nla_nest_cancel(skb, vf_port);
 975                         continue;
 976                 }
 977                 nla_nest_end(skb, vf_port);
 978         }
 979
 980         nla_nest_end(skb, vf_ports);
 981
 982         return 0;
 983
 984 nla_put_failure:
 985         nla_nest_cancel(skb, vf_ports);
 986         return -EMSGSIZE;
 987 }
 988
 989 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 990 {
 991         struct nlattr *port_self;
 992         int err;
 993
 994         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 995         if (!port_self)
 996                 return -EMSGSIZE;
 997
 998         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 999         if (err) {
1000                 nla_nest_cancel(skb, port_self);
1001                 return (err == -EMSGSIZE) ? err : 0;
1002         }
1003
1004         nla_nest_end(skb, port_self);
1005
1006         return 0;
1007 }
1008
1009 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1010                           u32 ext_filter_mask)
1011 {
1012         int err;
1013
1014         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1015             !(ext_filter_mask & RTEXT_FILTER_VF))
1016                 return 0;
1017
1018         err = rtnl_port_self_fill(skb, dev);
1019         if (err)
1020                 return err;
1021
1022         if (dev_num_vf(dev->dev.parent)) {
1023                 err = rtnl_vf_ports_fill(skb, dev);
1024                 if (err)
1025                         return err;
1026         }
1027
1028         return 0;
1029 }
1030
1031 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1032 {
1033         int err;
1034         struct netdev_phys_item_id ppid;
1035
1036         err = dev_get_phys_port_id(dev, &ppid);
1037         if (err) {
1038                 if (err == -EOPNOTSUPP)
1039                         return 0;
1040                 return err;
1041         }
1042
1043         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1044                 return -EMSGSIZE;
1045
1046         return 0;
1047 }
1048
1049 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1050 {
1051         char name[IFNAMSIZ];
1052         int err;
1053
1054         err = dev_get_phys_port_name(dev, name, sizeof(name));
1055         if (err) {
1056                 if (err == -EOPNOTSUPP)
1057                         return 0;
1058                 return err;
1059         }
1060
1061         if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
1062                 return -EMSGSIZE;
1063
1064         return 0;
1065 }
1066
1067 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1068 {
1069         int err;
1070         struct switchdev_attr attr = {
1071                 .orig_dev = dev,
1072                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1073                 .flags = SWITCHDEV_F_NO_RECURSE,
1074         };
1075
1076         err = switchdev_port_attr_get(dev, &attr);
1077         if (err) {
1078                 if (err == -EOPNOTSUPP)
1079                         return 0;
1080                 return err;
1081         }
1082
1083         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1084                     attr.u.ppid.id))
1085                 return -EMSGSIZE;
1086
1087         return 0;
1088 }
1089
1090 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1091                                               struct net_device *dev)
1092 {
1093         struct rtnl_link_stats64 *sp;
1094         struct nlattr *attr;
1095
1096         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1097                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1098         if (!attr)
1099                 return -EMSGSIZE;
1100
1101         sp = nla_data(attr);
1102         dev_get_stats(dev, sp);
1103
1104         attr = nla_reserve(skb, IFLA_STATS,
1105                            sizeof(struct rtnl_link_stats));
1106         if (!attr)
1107                 return -EMSGSIZE;
1108
1109         copy_rtnl_link_stats(nla_data(attr), sp);
1110
1111         return 0;
1112 }
1113
1114 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1115                                                struct net_device *dev,
1116                                                int vfs_num,
1117                                                struct nlattr *vfinfo)
1118 {
1119         struct ifla_vf_rss_query_en vf_rss_query_en;
1120         struct nlattr *vf, *vfstats, *vfvlanlist;
1121         struct ifla_vf_link_state vf_linkstate;
1122         struct ifla_vf_vlan_info vf_vlan_info;
1123         struct ifla_vf_spoofchk vf_spoofchk;
1124         struct ifla_vf_tx_rate vf_tx_rate;
1125         struct ifla_vf_stats vf_stats;
1126         struct ifla_vf_trust vf_trust;
1127         struct ifla_vf_vlan vf_vlan;
1128         struct ifla_vf_rate vf_rate;
1129         struct ifla_vf_mac vf_mac;
1130         struct ifla_vf_info ivi;
1131
1132         /* Not all SR-IOV capable drivers support the
1133          * spoofcheck and "RSS query enable" query.  Preset to
1134          * -1 so the user space tool can detect that the driver
1135          * didn't report anything.
1136          */
1137         ivi.spoofchk = -1;
1138         ivi.rss_query_en = -1;
1139         ivi.trusted = -1;
1140         memset(ivi.mac, 0, sizeof(ivi.mac));
1141         /* The default value for VF link state is "auto"
1142          * IFLA_VF_LINK_STATE_AUTO which equals zero
1143          */
1144         ivi.linkstate = 0;
1145         /* VLAN Protocol by default is 802.1Q */
1146         ivi.vlan_proto = htons(ETH_P_8021Q);
1147         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1148                 return 0;
1149
1150         memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1151
1152         vf_mac.vf =
1153                 vf_vlan.vf =
1154                 vf_vlan_info.vf =
1155                 vf_rate.vf =
1156                 vf_tx_rate.vf =
1157                 vf_spoofchk.vf =
1158                 vf_linkstate.vf =
1159                 vf_rss_query_en.vf =
1160                 vf_trust.vf = ivi.vf;
1161
1162         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1163         vf_vlan.vlan = ivi.vlan;
1164         vf_vlan.qos = ivi.qos;
1165         vf_vlan_info.vlan = ivi.vlan;
1166         vf_vlan_info.qos = ivi.qos;
1167         vf_vlan_info.vlan_proto = ivi.vlan_proto;
1168         vf_tx_rate.rate = ivi.max_tx_rate;
1169         vf_rate.min_tx_rate = ivi.min_tx_rate;
1170         vf_rate.max_tx_rate = ivi.max_tx_rate;
1171         vf_spoofchk.setting = ivi.spoofchk;
1172         vf_linkstate.link_state = ivi.linkstate;
1173         vf_rss_query_en.setting = ivi.rss_query_en;
1174         vf_trust.setting = ivi.trusted;
1175         vf = nla_nest_start(skb, IFLA_VF_INFO);
1176         if (!vf)
1177                 goto nla_put_vfinfo_failure;
1178         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1179             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1180             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1181                     &vf_rate) ||
1182             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1183                     &vf_tx_rate) ||
1184             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1185                     &vf_spoofchk) ||
1186             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1187                     &vf_linkstate) ||
1188             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1189                     sizeof(vf_rss_query_en),
1190                     &vf_rss_query_en) ||
1191             nla_put(skb, IFLA_VF_TRUST,
1192                     sizeof(vf_trust), &vf_trust))
1193                 goto nla_put_vf_failure;
1194         vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST);
1195         if (!vfvlanlist)
1196                 goto nla_put_vf_failure;
1197         if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1198                     &vf_vlan_info)) {
1199                 nla_nest_cancel(skb, vfvlanlist);
1200                 goto nla_put_vf_failure;
1201         }
1202         nla_nest_end(skb, vfvlanlist);
1203         memset(&vf_stats, 0, sizeof(vf_stats));
1204         if (dev->netdev_ops->ndo_get_vf_stats)
1205                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1206                                                 &vf_stats);
1207         vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1208         if (!vfstats)
1209                 goto nla_put_vf_failure;
1210         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1211                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1212             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1213                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1214             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1215                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1216             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1217                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1218             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1219                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1220             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1221                               vf_stats.multicast, IFLA_VF_STATS_PAD)) {
1222                 nla_nest_cancel(skb, vfstats);
1223                 goto nla_put_vf_failure;
1224         }
1225         nla_nest_end(skb, vfstats);
1226         nla_nest_end(skb, vf);
1227         return 0;
1228
1229 nla_put_vf_failure:
1230         nla_nest_cancel(skb, vf);
1231 nla_put_vfinfo_failure:
1232         nla_nest_cancel(skb, vfinfo);
1233         return -EMSGSIZE;
1234 }
1235
1236 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1237 {
1238         struct rtnl_link_ifmap map;
1239
1240         memset(&map, 0, sizeof(map));
1241         map.mem_start   = dev->mem_start;
1242         map.mem_end     = dev->mem_end;
1243         map.base_addr   = dev->base_addr;
1244         map.irq         = dev->irq;
1245         map.dma         = dev->dma;
1246         map.port        = dev->if_port;
1247
1248         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1249                 return -EMSGSIZE;
1250
1251         return 0;
1252 }
1253
1254 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1255 {
1256         struct netdev_xdp xdp_op = {};
1257         struct nlattr *xdp;
1258         int err;
1259
1260         if (!dev->netdev_ops->ndo_xdp)
1261                 return 0;
1262         xdp = nla_nest_start(skb, IFLA_XDP);
1263         if (!xdp)
1264                 return -EMSGSIZE;
1265         xdp_op.command = XDP_QUERY_PROG;
1266         err = dev->netdev_ops->ndo_xdp(dev, &xdp_op);
1267         if (err)
1268                 goto err_cancel;
1269         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, xdp_op.prog_attached);
1270         if (err)
1271                 goto err_cancel;
1272
1273         nla_nest_end(skb, xdp);
1274         return 0;
1275
1276 err_cancel:
1277         nla_nest_cancel(skb, xdp);
1278         return err;
1279 }
1280
1281 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1282                             int type, u32 pid, u32 seq, u32 change,
1283                             unsigned int flags, u32 ext_filter_mask)
1284 {
1285         struct ifinfomsg *ifm;
1286         struct nlmsghdr *nlh;
1287         struct nlattr *af_spec;
1288         struct rtnl_af_ops *af_ops;
1289         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1290
1291         ASSERT_RTNL();
1292         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1293         if (nlh == NULL)
1294                 return -EMSGSIZE;
1295
1296         ifm = nlmsg_data(nlh);
1297         ifm->ifi_family = AF_UNSPEC;
1298         ifm->__ifi_pad = 0;
1299         ifm->ifi_type = dev->type;
1300         ifm->ifi_index = dev->ifindex;
1301         ifm->ifi_flags = dev_get_flags(dev);
1302         ifm->ifi_change = change;
1303
1304         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1305             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1306             nla_put_u8(skb, IFLA_OPERSTATE,
1307                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1308             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1309             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1310             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1311             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1312             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1313             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1314             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1315 #ifdef CONFIG_RPS
1316             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1317 #endif
1318             (dev->ifindex != dev_get_iflink(dev) &&
1319              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1320             (upper_dev &&
1321              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1322             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1323             (dev->qdisc &&
1324              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1325             (dev->ifalias &&
1326              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1327             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1328                         atomic_read(&dev->carrier_changes)) ||
1329             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1330                 goto nla_put_failure;
1331
1332         if (rtnl_fill_link_ifmap(skb, dev))
1333                 goto nla_put_failure;
1334
1335         if (dev->addr_len) {
1336                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1337                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1338                         goto nla_put_failure;
1339         }
1340
1341         if (rtnl_phys_port_id_fill(skb, dev))
1342                 goto nla_put_failure;
1343
1344         if (rtnl_phys_port_name_fill(skb, dev))
1345                 goto nla_put_failure;
1346
1347         if (rtnl_phys_switch_id_fill(skb, dev))
1348                 goto nla_put_failure;
1349
1350         if (rtnl_fill_stats(skb, dev))
1351                 goto nla_put_failure;
1352
1353         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1354             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1355                 goto nla_put_failure;
1356
1357         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent &&
1358             ext_filter_mask & RTEXT_FILTER_VF) {
1359                 int i;
1360                 struct nlattr *vfinfo;
1361                 int num_vfs = dev_num_vf(dev->dev.parent);
1362
1363                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1364                 if (!vfinfo)
1365                         goto nla_put_failure;
1366                 for (i = 0; i < num_vfs; i++) {
1367                         if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1368                                 goto nla_put_failure;
1369                 }
1370
1371                 nla_nest_end(skb, vfinfo);
1372         }
1373
1374         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1375                 goto nla_put_failure;
1376
1377         if (rtnl_xdp_fill(skb, dev))
1378                 goto nla_put_failure;
1379
1380         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1381                 if (rtnl_link_fill(skb, dev) < 0)
1382                         goto nla_put_failure;
1383         }
1384
1385         if (dev->rtnl_link_ops &&
1386             dev->rtnl_link_ops->get_link_net) {
1387                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1388
1389                 if (!net_eq(dev_net(dev), link_net)) {
1390                         int id = peernet2id_alloc(dev_net(dev), link_net);
1391
1392                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1393                                 goto nla_put_failure;
1394                 }
1395         }
1396
1397         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1398                 goto nla_put_failure;
1399
1400         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1401                 if (af_ops->fill_link_af) {
1402                         struct nlattr *af;
1403                         int err;
1404
1405                         if (!(af = nla_nest_start(skb, af_ops->family)))
1406                                 goto nla_put_failure;
1407
1408                         err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1409
1410                         /*
1411                          * Caller may return ENODATA to indicate that there
1412                          * was no data to be dumped. This is not an error, it
1413                          * means we should trim the attribute header and
1414                          * continue.
1415                          */
1416                         if (err == -ENODATA)
1417                                 nla_nest_cancel(skb, af);
1418                         else if (err < 0)
1419                                 goto nla_put_failure;
1420
1421                         nla_nest_end(skb, af);
1422                 }
1423         }
1424
1425         nla_nest_end(skb, af_spec);
1426
1427         nlmsg_end(skb, nlh);
1428         return 0;
1429
1430 nla_put_failure:
1431         nlmsg_cancel(skb, nlh);
1432         return -EMSGSIZE;
1433 }
1434
1435 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1436         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1437         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1438         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1439         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1440         [IFLA_MTU]              = { .type = NLA_U32 },
1441         [IFLA_LINK]             = { .type = NLA_U32 },
1442         [IFLA_MASTER]           = { .type = NLA_U32 },
1443         [IFLA_CARRIER]          = { .type = NLA_U8 },
1444         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1445         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1446         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1447         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1448         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1449         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1450         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1451         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1452         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1453         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1454         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1455         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1456         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1457         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1458         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1459         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1460         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1461         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1462         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1463         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1464         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1465         [IFLA_XDP]              = { .type = NLA_NESTED },
1466 };
1467
1468 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1469         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1470         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1471         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1472         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1473 };
1474
1475 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1476         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1477         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1478         [IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1479         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1480         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1481         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1482         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1483         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1484         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1485         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1486         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1487         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1488 };
1489
1490 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1491         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1492         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1493                                     .len = PORT_PROFILE_MAX },
1494         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1495                                     .len = sizeof(struct ifla_port_vsi)},
1496         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1497                                       .len = PORT_UUID_MAX },
1498         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1499                                     .len = PORT_UUID_MAX },
1500         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1501         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1502 };
1503
1504 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1505         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1506         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1507 };
1508
1509 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1510 {
1511         const struct rtnl_link_ops *ops = NULL;
1512         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1513
1514         if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0)
1515                 return NULL;
1516
1517         if (linfo[IFLA_INFO_KIND]) {
1518                 char kind[MODULE_NAME_LEN];
1519
1520                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1521                 ops = rtnl_link_ops_get(kind);
1522         }
1523
1524         return ops;
1525 }
1526
1527 static bool link_master_filtered(struct net_device *dev, int master_idx)
1528 {
1529         struct net_device *master;
1530
1531         if (!master_idx)
1532                 return false;
1533
1534         master = netdev_master_upper_dev_get(dev);
1535         if (!master || master->ifindex != master_idx)
1536                 return true;
1537
1538         return false;
1539 }
1540
1541 static bool link_kind_filtered(const struct net_device *dev,
1542                                const struct rtnl_link_ops *kind_ops)
1543 {
1544         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1545                 return true;
1546
1547         return false;
1548 }
1549
1550 static bool link_dump_filtered(struct net_device *dev,
1551                                int master_idx,
1552                                const struct rtnl_link_ops *kind_ops)
1553 {
1554         if (link_master_filtered(dev, master_idx) ||
1555             link_kind_filtered(dev, kind_ops))
1556                 return true;
1557
1558         return false;
1559 }
1560
1561 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1562 {
1563         struct net *net = sock_net(skb->sk);
1564         int h, s_h;
1565         int idx = 0, s_idx;
1566         struct net_device *dev;
1567         struct hlist_head *head;
1568         struct nlattr *tb[IFLA_MAX+1];
1569         u32 ext_filter_mask = 0;
1570         const struct rtnl_link_ops *kind_ops = NULL;
1571         unsigned int flags = NLM_F_MULTI;
1572         int master_idx = 0;
1573         int err;
1574         int hdrlen;
1575
1576         s_h = cb->args[0];
1577         s_idx = cb->args[1];
1578
1579         cb->seq = net->dev_base_seq;
1580
1581         /* A hack to preserve kernel<->userspace interface.
1582          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1583          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1584          * what iproute2 < v3.9.0 used.
1585          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1586          * attribute, its netlink message is shorter than struct ifinfomsg.
1587          */
1588         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1589                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1590
1591         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1592
1593                 if (tb[IFLA_EXT_MASK])
1594                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1595
1596                 if (tb[IFLA_MASTER])
1597                         master_idx = nla_get_u32(tb[IFLA_MASTER]);
1598
1599                 if (tb[IFLA_LINKINFO])
1600                         kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1601
1602                 if (master_idx || kind_ops)
1603                         flags |= NLM_F_DUMP_FILTERED;
1604         }
1605
1606         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1607                 idx = 0;
1608                 head = &net->dev_index_head[h];
1609                 hlist_for_each_entry(dev, head, index_hlist) {
1610                         if (link_dump_filtered(dev, master_idx, kind_ops))
1611                                 continue;
1612                         if (idx < s_idx)
1613                                 goto cont;
1614                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1615                                                NETLINK_CB(cb->skb).portid,
1616                                                cb->nlh->nlmsg_seq, 0,
1617                                                flags,
1618                                                ext_filter_mask);
1619                         /* If we ran out of room on the first message,
1620                          * we're in trouble
1621                          */
1622                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1623
1624                         if (err < 0)
1625                                 goto out;
1626
1627                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1628 cont:
1629                         idx++;
1630                 }
1631         }
1632 out:
1633         cb->args[1] = idx;
1634         cb->args[0] = h;
1635
1636         return skb->len;
1637 }
1638
1639 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1640 {
1641         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1642 }
1643 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1644
1645 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1646 {
1647         struct net *net;
1648         /* Examine the link attributes and figure out which
1649          * network namespace we are talking about.
1650          */
1651         if (tb[IFLA_NET_NS_PID])
1652                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1653         else if (tb[IFLA_NET_NS_FD])
1654                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1655         else
1656                 net = get_net(src_net);
1657         return net;
1658 }
1659 EXPORT_SYMBOL(rtnl_link_get_net);
1660
1661 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1662 {
1663         if (dev) {
1664                 if (tb[IFLA_ADDRESS] &&
1665                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1666                         return -EINVAL;
1667
1668                 if (tb[IFLA_BROADCAST] &&
1669                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1670                         return -EINVAL;
1671         }
1672
1673         if (tb[IFLA_AF_SPEC]) {
1674                 struct nlattr *af;
1675                 int rem, err;
1676
1677                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1678                         const struct rtnl_af_ops *af_ops;
1679
1680                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1681                                 return -EAFNOSUPPORT;
1682
1683                         if (!af_ops->set_link_af)
1684                                 return -EOPNOTSUPP;
1685
1686                         if (af_ops->validate_link_af) {
1687                                 err = af_ops->validate_link_af(dev, af);
1688                                 if (err < 0)
1689                                         return err;
1690                         }
1691                 }
1692         }
1693
1694         return 0;
1695 }
1696
1697 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
1698                                   int guid_type)
1699 {
1700         const struct net_device_ops *ops = dev->netdev_ops;
1701
1702         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
1703 }
1704
1705 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
1706 {
1707         if (dev->type != ARPHRD_INFINIBAND)
1708                 return -EOPNOTSUPP;
1709
1710         return handle_infiniband_guid(dev, ivt, guid_type);
1711 }
1712
1713 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1714 {
1715         const struct net_device_ops *ops = dev->netdev_ops;
1716         int err = -EINVAL;
1717
1718         if (tb[IFLA_VF_MAC]) {
1719                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1720
1721                 err = -EOPNOTSUPP;
1722                 if (ops->ndo_set_vf_mac)
1723                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
1724                                                   ivm->mac);
1725                 if (err < 0)
1726                         return err;
1727         }
1728
1729         if (tb[IFLA_VF_VLAN]) {
1730                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1731
1732                 err = -EOPNOTSUPP;
1733                 if (ops->ndo_set_vf_vlan)
1734                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1735                                                    ivv->qos,
1736                                                    htons(ETH_P_8021Q));
1737                 if (err < 0)
1738                         return err;
1739         }
1740
1741         if (tb[IFLA_VF_VLAN_LIST]) {
1742                 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
1743                 struct nlattr *attr;
1744                 int rem, len = 0;
1745
1746                 err = -EOPNOTSUPP;
1747                 if (!ops->ndo_set_vf_vlan)
1748                         return err;
1749
1750                 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
1751                         if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
1752                             nla_len(attr) < NLA_HDRLEN) {
1753                                 return -EINVAL;
1754                         }
1755                         if (len >= MAX_VLAN_LIST_LEN)
1756                                 return -EOPNOTSUPP;
1757                         ivvl[len] = nla_data(attr);
1758
1759                         len++;
1760                 }
1761                 if (len == 0)
1762                         return -EINVAL;
1763
1764                 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
1765                                            ivvl[0]->qos, ivvl[0]->vlan_proto);
1766                 if (err < 0)
1767                         return err;
1768         }
1769
1770         if (tb[IFLA_VF_TX_RATE]) {
1771                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1772                 struct ifla_vf_info ivf;
1773
1774                 err = -EOPNOTSUPP;
1775                 if (ops->ndo_get_vf_config)
1776                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1777                 if (err < 0)
1778                         return err;
1779
1780                 err = -EOPNOTSUPP;
1781                 if (ops->ndo_set_vf_rate)
1782                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1783                                                    ivf.min_tx_rate,
1784                                                    ivt->rate);
1785                 if (err < 0)
1786                         return err;
1787         }
1788
1789         if (tb[IFLA_VF_RATE]) {
1790                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1791
1792                 err = -EOPNOTSUPP;
1793                 if (ops->ndo_set_vf_rate)
1794                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1795                                                    ivt->min_tx_rate,
1796                                                    ivt->max_tx_rate);
1797                 if (err < 0)
1798                         return err;
1799         }
1800
1801         if (tb[IFLA_VF_SPOOFCHK]) {
1802                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1803
1804                 err = -EOPNOTSUPP;
1805                 if (ops->ndo_set_vf_spoofchk)
1806                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1807                                                        ivs->setting);
1808                 if (err < 0)
1809                         return err;
1810         }
1811
1812         if (tb[IFLA_VF_LINK_STATE]) {
1813                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1814
1815                 err = -EOPNOTSUPP;
1816                 if (ops->ndo_set_vf_link_state)
1817                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1818                                                          ivl->link_state);
1819                 if (err < 0)
1820                         return err;
1821         }
1822
1823         if (tb[IFLA_VF_RSS_QUERY_EN]) {
1824                 struct ifla_vf_rss_query_en *ivrssq_en;
1825
1826                 err = -EOPNOTSUPP;
1827                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1828                 if (ops->ndo_set_vf_rss_query_en)
1829                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1830                                                            ivrssq_en->setting);
1831                 if (err < 0)
1832                         return err;
1833         }
1834
1835         if (tb[IFLA_VF_TRUST]) {
1836                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1837
1838                 err = -EOPNOTSUPP;
1839                 if (ops->ndo_set_vf_trust)
1840                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1841                 if (err < 0)
1842                         return err;
1843         }
1844
1845         if (tb[IFLA_VF_IB_NODE_GUID]) {
1846                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
1847
1848                 if (!ops->ndo_set_vf_guid)
1849                         return -EOPNOTSUPP;
1850
1851                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
1852         }
1853
1854         if (tb[IFLA_VF_IB_PORT_GUID]) {
1855                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
1856
1857                 if (!ops->ndo_set_vf_guid)
1858                         return -EOPNOTSUPP;
1859
1860                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
1861         }
1862
1863         return err;
1864 }
1865
1866 static int do_set_master(struct net_device *dev, int ifindex)
1867 {
1868         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1869         const struct net_device_ops *ops;
1870         int err;
1871
1872         if (upper_dev) {
1873                 if (upper_dev->ifindex == ifindex)
1874                         return 0;
1875                 ops = upper_dev->netdev_ops;
1876                 if (ops->ndo_del_slave) {
1877                         err = ops->ndo_del_slave(upper_dev, dev);
1878                         if (err)
1879                                 return err;
1880                 } else {
1881                         return -EOPNOTSUPP;
1882                 }
1883         }
1884
1885         if (ifindex) {
1886                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1887                 if (!upper_dev)
1888                         return -EINVAL;
1889                 ops = upper_dev->netdev_ops;
1890                 if (ops->ndo_add_slave) {
1891                         err = ops->ndo_add_slave(upper_dev, dev);
1892                         if (err)
1893                                 return err;
1894                 } else {
1895                         return -EOPNOTSUPP;
1896                 }
1897         }
1898         return 0;
1899 }
1900
1901 #define DO_SETLINK_MODIFIED     0x01
1902 /* notify flag means notify + modified. */
1903 #define DO_SETLINK_NOTIFY       0x03
1904 static int do_setlink(const struct sk_buff *skb,
1905                       struct net_device *dev, struct ifinfomsg *ifm,
1906                       struct nlattr **tb, char *ifname, int status)
1907 {
1908         const struct net_device_ops *ops = dev->netdev_ops;
1909         int err;
1910
1911         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1912                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1913                 if (IS_ERR(net)) {
1914                         err = PTR_ERR(net);
1915                         goto errout;
1916                 }
1917                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1918                         put_net(net);
1919                         err = -EPERM;
1920                         goto errout;
1921                 }
1922                 err = dev_change_net_namespace(dev, net, ifname);
1923                 put_net(net);
1924                 if (err)
1925                         goto errout;
1926                 status |= DO_SETLINK_MODIFIED;
1927         }
1928
1929         if (tb[IFLA_MAP]) {
1930                 struct rtnl_link_ifmap *u_map;
1931                 struct ifmap k_map;
1932
1933                 if (!ops->ndo_set_config) {
1934                         err = -EOPNOTSUPP;
1935                         goto errout;
1936                 }
1937
1938                 if (!netif_device_present(dev)) {
1939                         err = -ENODEV;
1940                         goto errout;
1941                 }
1942
1943                 u_map = nla_data(tb[IFLA_MAP]);
1944                 k_map.mem_start = (unsigned long) u_map->mem_start;
1945                 k_map.mem_end = (unsigned long) u_map->mem_end;
1946                 k_map.base_addr = (unsigned short) u_map->base_addr;
1947                 k_map.irq = (unsigned char) u_map->irq;
1948                 k_map.dma = (unsigned char) u_map->dma;
1949                 k_map.port = (unsigned char) u_map->port;
1950
1951                 err = ops->ndo_set_config(dev, &k_map);
1952                 if (err < 0)
1953                         goto errout;
1954
1955                 status |= DO_SETLINK_NOTIFY;
1956         }
1957
1958         if (tb[IFLA_ADDRESS]) {
1959                 struct sockaddr *sa;
1960                 int len;
1961
1962                 len = sizeof(sa_family_t) + dev->addr_len;
1963                 sa = kmalloc(len, GFP_KERNEL);
1964                 if (!sa) {
1965                         err = -ENOMEM;
1966                         goto errout;
1967                 }
1968                 sa->sa_family = dev->type;
1969                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1970                        dev->addr_len);
1971                 err = dev_set_mac_address(dev, sa);
1972                 kfree(sa);
1973                 if (err)
1974                         goto errout;
1975                 status |= DO_SETLINK_MODIFIED;
1976         }
1977
1978         if (tb[IFLA_MTU]) {
1979                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1980                 if (err < 0)
1981                         goto errout;
1982                 status |= DO_SETLINK_MODIFIED;
1983         }
1984
1985         if (tb[IFLA_GROUP]) {
1986                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1987                 status |= DO_SETLINK_NOTIFY;
1988         }
1989
1990         /*
1991          * Interface selected by interface index but interface
1992          * name provided implies that a name change has been
1993          * requested.
1994          */
1995         if (ifm->ifi_index > 0 && ifname[0]) {
1996                 err = dev_change_name(dev, ifname);
1997                 if (err < 0)
1998                         goto errout;
1999                 status |= DO_SETLINK_MODIFIED;
2000         }
2001
2002         if (tb[IFLA_IFALIAS]) {
2003                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2004                                     nla_len(tb[IFLA_IFALIAS]));
2005                 if (err < 0)
2006                         goto errout;
2007                 status |= DO_SETLINK_NOTIFY;
2008         }
2009
2010         if (tb[IFLA_BROADCAST]) {
2011                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2012                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2013         }
2014
2015         if (ifm->ifi_flags || ifm->ifi_change) {
2016                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2017                 if (err < 0)
2018                         goto errout;
2019         }
2020
2021         if (tb[IFLA_MASTER]) {
2022                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
2023                 if (err)
2024                         goto errout;
2025                 status |= DO_SETLINK_MODIFIED;
2026         }
2027
2028         if (tb[IFLA_CARRIER]) {
2029                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2030                 if (err)
2031                         goto errout;
2032                 status |= DO_SETLINK_MODIFIED;
2033         }
2034
2035         if (tb[IFLA_TXQLEN]) {
2036                 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
2037                 unsigned long orig_len = dev->tx_queue_len;
2038
2039                 if (dev->tx_queue_len ^ value) {
2040                         dev->tx_queue_len = value;
2041                         err = call_netdevice_notifiers(
2042                               NETDEV_CHANGE_TX_QUEUE_LEN, dev);
2043                         err = notifier_to_errno(err);
2044                         if (err) {
2045                                 dev->tx_queue_len = orig_len;
2046                                 goto errout;
2047                         }
2048                         status |= DO_SETLINK_NOTIFY;
2049                 }
2050         }
2051
2052         if (tb[IFLA_OPERSTATE])
2053                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2054
2055         if (tb[IFLA_LINKMODE]) {
2056                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2057
2058                 write_lock_bh(&dev_base_lock);
2059                 if (dev->link_mode ^ value)
2060                         status |= DO_SETLINK_NOTIFY;
2061                 dev->link_mode = value;
2062                 write_unlock_bh(&dev_base_lock);
2063         }
2064
2065         if (tb[IFLA_VFINFO_LIST]) {
2066                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2067                 struct nlattr *attr;
2068                 int rem;
2069
2070                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2071                         if (nla_type(attr) != IFLA_VF_INFO ||
2072                             nla_len(attr) < NLA_HDRLEN) {
2073                                 err = -EINVAL;
2074                                 goto errout;
2075                         }
2076                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2077                                                ifla_vf_policy);
2078                         if (err < 0)
2079                                 goto errout;
2080                         err = do_setvfinfo(dev, vfinfo);
2081                         if (err < 0)
2082                                 goto errout;
2083                         status |= DO_SETLINK_NOTIFY;
2084                 }
2085         }
2086         err = 0;
2087
2088         if (tb[IFLA_VF_PORTS]) {
2089                 struct nlattr *port[IFLA_PORT_MAX+1];
2090                 struct nlattr *attr;
2091                 int vf;
2092                 int rem;
2093
2094                 err = -EOPNOTSUPP;
2095                 if (!ops->ndo_set_vf_port)
2096                         goto errout;
2097
2098                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2099                         if (nla_type(attr) != IFLA_VF_PORT ||
2100                             nla_len(attr) < NLA_HDRLEN) {
2101                                 err = -EINVAL;
2102                                 goto errout;
2103                         }
2104                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2105                                                ifla_port_policy);
2106                         if (err < 0)
2107                                 goto errout;
2108                         if (!port[IFLA_PORT_VF]) {
2109                                 err = -EOPNOTSUPP;
2110                                 goto errout;
2111                         }
2112                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2113                         err = ops->ndo_set_vf_port(dev, vf, port);
2114                         if (err < 0)
2115                                 goto errout;
2116                         status |= DO_SETLINK_NOTIFY;
2117                 }
2118         }
2119         err = 0;
2120
2121         if (tb[IFLA_PORT_SELF]) {
2122                 struct nlattr *port[IFLA_PORT_MAX+1];
2123
2124                 err = nla_parse_nested(port, IFLA_PORT_MAX,
2125                         tb[IFLA_PORT_SELF], ifla_port_policy);
2126                 if (err < 0)
2127                         goto errout;
2128
2129                 err = -EOPNOTSUPP;
2130                 if (ops->ndo_set_vf_port)
2131                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2132                 if (err < 0)
2133                         goto errout;
2134                 status |= DO_SETLINK_NOTIFY;
2135         }
2136
2137         if (tb[IFLA_AF_SPEC]) {
2138                 struct nlattr *af;
2139                 int rem;
2140
2141                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2142                         const struct rtnl_af_ops *af_ops;
2143
2144                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
2145                                 BUG();
2146
2147                         err = af_ops->set_link_af(dev, af);
2148                         if (err < 0)
2149                                 goto errout;
2150
2151                         status |= DO_SETLINK_NOTIFY;
2152                 }
2153         }
2154         err = 0;
2155
2156         if (tb[IFLA_PROTO_DOWN]) {
2157                 err = dev_change_proto_down(dev,
2158                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2159                 if (err)
2160                         goto errout;
2161                 status |= DO_SETLINK_NOTIFY;
2162         }
2163
2164         if (tb[IFLA_XDP]) {
2165                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2166
2167                 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2168                                        ifla_xdp_policy);
2169                 if (err < 0)
2170                         goto errout;
2171
2172                 if (xdp[IFLA_XDP_ATTACHED]) {
2173                         err = -EINVAL;
2174                         goto errout;
2175                 }
2176                 if (xdp[IFLA_XDP_FD]) {
2177                         err = dev_change_xdp_fd(dev,
2178                                                 nla_get_s32(xdp[IFLA_XDP_FD]));
2179                         if (err)
2180                                 goto errout;
2181                         status |= DO_SETLINK_NOTIFY;
2182                 }
2183         }
2184
2185 errout:
2186         if (status & DO_SETLINK_MODIFIED) {
2187                 if (status & DO_SETLINK_NOTIFY)
2188                         netdev_state_change(dev);
2189
2190                 if (err < 0)
2191                         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",
2192                                              dev->name);
2193         }
2194
2195         return err;
2196 }
2197
2198 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2199 {
2200         struct net *net = sock_net(skb->sk);
2201         struct ifinfomsg *ifm;
2202         struct net_device *dev;
2203         int err;
2204         struct nlattr *tb[IFLA_MAX+1];
2205         char ifname[IFNAMSIZ];
2206
2207         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2208         if (err < 0)
2209                 goto errout;
2210
2211         if (tb[IFLA_IFNAME])
2212                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2213         else
2214                 ifname[0] = '\0';
2215
2216         err = -EINVAL;
2217         ifm = nlmsg_data(nlh);
2218         if (ifm->ifi_index > 0)
2219                 dev = __dev_get_by_index(net, ifm->ifi_index);
2220         else if (tb[IFLA_IFNAME])
2221                 dev = __dev_get_by_name(net, ifname);
2222         else
2223                 goto errout;
2224
2225         if (dev == NULL) {
2226                 err = -ENODEV;
2227                 goto errout;
2228         }
2229
2230         err = validate_linkmsg(dev, tb);
2231         if (err < 0)
2232                 goto errout;
2233
2234         err = do_setlink(skb, dev, ifm, tb, ifname, 0);
2235 errout:
2236         return err;
2237 }
2238
2239 static int rtnl_group_dellink(const struct net *net, int group)
2240 {
2241         struct net_device *dev, *aux;
2242         LIST_HEAD(list_kill);
2243         bool found = false;
2244
2245         if (!group)
2246                 return -EPERM;
2247
2248         for_each_netdev(net, dev) {
2249                 if (dev->group == group) {
2250                         const struct rtnl_link_ops *ops;
2251
2252                         found = true;
2253                         ops = dev->rtnl_link_ops;
2254                         if (!ops || !ops->dellink)
2255                                 return -EOPNOTSUPP;
2256                 }
2257         }
2258
2259         if (!found)
2260                 return -ENODEV;
2261
2262         for_each_netdev_safe(net, dev, aux) {
2263                 if (dev->group == group) {
2264                         const struct rtnl_link_ops *ops;
2265
2266                         ops = dev->rtnl_link_ops;
2267                         ops->dellink(dev, &list_kill);
2268                 }
2269         }
2270         unregister_netdevice_many(&list_kill);
2271
2272         return 0;
2273 }
2274
2275 int rtnl_delete_link(struct net_device *dev)
2276 {
2277         const struct rtnl_link_ops *ops;
2278         LIST_HEAD(list_kill);
2279
2280         ops = dev->rtnl_link_ops;
2281         if (!ops || !ops->dellink)
2282                 return -EOPNOTSUPP;
2283
2284         ops->dellink(dev, &list_kill);
2285         unregister_netdevice_many(&list_kill);
2286
2287         return 0;
2288 }
2289 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2290
2291 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2292 {
2293         struct net *net = sock_net(skb->sk);
2294         struct net_device *dev;
2295         struct ifinfomsg *ifm;
2296         char ifname[IFNAMSIZ];
2297         struct nlattr *tb[IFLA_MAX+1];
2298         int err;
2299
2300         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2301         if (err < 0)
2302                 return err;
2303
2304         if (tb[IFLA_IFNAME])
2305                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2306
2307         ifm = nlmsg_data(nlh);
2308         if (ifm->ifi_index > 0)
2309                 dev = __dev_get_by_index(net, ifm->ifi_index);
2310         else if (tb[IFLA_IFNAME])
2311                 dev = __dev_get_by_name(net, ifname);
2312         else if (tb[IFLA_GROUP])
2313                 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2314         else
2315                 return -EINVAL;
2316
2317         if (!dev)
2318                 return -ENODEV;
2319
2320         return rtnl_delete_link(dev);
2321 }
2322
2323 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2324 {
2325         unsigned int old_flags;
2326         int err;
2327
2328         old_flags = dev->flags;
2329         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2330                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2331                 if (err < 0)
2332                         return err;
2333         }
2334
2335         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2336
2337         __dev_notify_flags(dev, old_flags, ~0U);
2338         return 0;
2339 }
2340 EXPORT_SYMBOL(rtnl_configure_link);
2341
2342 struct net_device *rtnl_create_link(struct net *net,
2343         const char *ifname, unsigned char name_assign_type,
2344         const struct rtnl_link_ops *ops, struct nlattr *tb[])
2345 {
2346         int err;
2347         struct net_device *dev;
2348         unsigned int num_tx_queues = 1;
2349         unsigned int num_rx_queues = 1;
2350
2351         if (tb[IFLA_NUM_TX_QUEUES])
2352                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2353         else if (ops->get_num_tx_queues)
2354                 num_tx_queues = ops->get_num_tx_queues();
2355
2356         if (tb[IFLA_NUM_RX_QUEUES])
2357                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2358         else if (ops->get_num_rx_queues)
2359                 num_rx_queues = ops->get_num_rx_queues();
2360
2361         err = -ENOMEM;
2362         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2363                                ops->setup, num_tx_queues, num_rx_queues);
2364         if (!dev)
2365                 goto err;
2366
2367         dev_net_set(dev, net);
2368         dev->rtnl_link_ops = ops;
2369         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2370
2371         if (tb[IFLA_MTU])
2372                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2373         if (tb[IFLA_ADDRESS]) {
2374                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2375                                 nla_len(tb[IFLA_ADDRESS]));
2376                 dev->addr_assign_type = NET_ADDR_SET;
2377         }
2378         if (tb[IFLA_BROADCAST])
2379                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2380                                 nla_len(tb[IFLA_BROADCAST]));
2381         if (tb[IFLA_TXQLEN])
2382                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2383         if (tb[IFLA_OPERSTATE])
2384                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2385         if (tb[IFLA_LINKMODE])
2386                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2387         if (tb[IFLA_GROUP])
2388                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2389
2390         return dev;
2391
2392 err:
2393         return ERR_PTR(err);
2394 }
2395 EXPORT_SYMBOL(rtnl_create_link);
2396
2397 static int rtnl_group_changelink(const struct sk_buff *skb,
2398                 struct net *net, int group,
2399                 struct ifinfomsg *ifm,
2400                 struct nlattr **tb)
2401 {
2402         struct net_device *dev, *aux;
2403         int err;
2404
2405         for_each_netdev_safe(net, dev, aux) {
2406                 if (dev->group == group) {
2407                         err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2408                         if (err < 0)
2409                                 return err;
2410                 }
2411         }
2412
2413         return 0;
2414 }
2415
2416 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2417 {
2418         struct net *net = sock_net(skb->sk);
2419         const struct rtnl_link_ops *ops;
2420         const struct rtnl_link_ops *m_ops = NULL;
2421         struct net_device *dev;
2422         struct net_device *master_dev = NULL;
2423         struct ifinfomsg *ifm;
2424         char kind[MODULE_NAME_LEN];
2425         char ifname[IFNAMSIZ];
2426         struct nlattr *tb[IFLA_MAX+1];
2427         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2428         unsigned char name_assign_type = NET_NAME_USER;
2429         int err;
2430
2431 #ifdef CONFIG_MODULES
2432 replay:
2433 #endif
2434         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2435         if (err < 0)
2436                 return err;
2437
2438         if (tb[IFLA_IFNAME])
2439                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2440         else
2441                 ifname[0] = '\0';
2442
2443         ifm = nlmsg_data(nlh);
2444         if (ifm->ifi_index > 0)
2445                 dev = __dev_get_by_index(net, ifm->ifi_index);
2446         else {
2447                 if (ifname[0])
2448                         dev = __dev_get_by_name(net, ifname);
2449                 else
2450                         dev = NULL;
2451         }
2452
2453         if (dev) {
2454                 master_dev = netdev_master_upper_dev_get(dev);
2455                 if (master_dev)
2456                         m_ops = master_dev->rtnl_link_ops;
2457         }
2458
2459         err = validate_linkmsg(dev, tb);
2460         if (err < 0)
2461                 return err;
2462
2463         if (tb[IFLA_LINKINFO]) {
2464                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2465                                        tb[IFLA_LINKINFO], ifla_info_policy);
2466                 if (err < 0)
2467                         return err;
2468         } else
2469                 memset(linkinfo, 0, sizeof(linkinfo));
2470
2471         if (linkinfo[IFLA_INFO_KIND]) {
2472                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2473                 ops = rtnl_link_ops_get(kind);
2474         } else {
2475                 kind[0] = '\0';
2476                 ops = NULL;
2477         }
2478
2479         if (1) {
2480                 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2481                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2482                 struct nlattr **data = NULL;
2483                 struct nlattr **slave_data = NULL;
2484                 struct net *dest_net, *link_net = NULL;
2485
2486                 if (ops) {
2487                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2488                                 err = nla_parse_nested(attr, ops->maxtype,
2489                                                        linkinfo[IFLA_INFO_DATA],
2490                                                        ops->policy);
2491                                 if (err < 0)
2492                                         return err;
2493                                 data = attr;
2494                         }
2495                         if (ops->validate) {
2496                                 err = ops->validate(tb, data);
2497                                 if (err < 0)
2498                                         return err;
2499                         }
2500                 }
2501
2502                 if (m_ops) {
2503                         if (m_ops->slave_maxtype &&
2504                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2505                                 err = nla_parse_nested(slave_attr,
2506                                                        m_ops->slave_maxtype,
2507                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2508                                                        m_ops->slave_policy);
2509                                 if (err < 0)
2510                                         return err;
2511                                 slave_data = slave_attr;
2512                         }
2513                         if (m_ops->slave_validate) {
2514                                 err = m_ops->slave_validate(tb, slave_data);
2515                                 if (err < 0)
2516                                         return err;
2517                         }
2518                 }
2519
2520                 if (dev) {
2521                         int status = 0;
2522
2523                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2524                                 return -EEXIST;
2525                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2526                                 return -EOPNOTSUPP;
2527
2528                         if (linkinfo[IFLA_INFO_DATA]) {
2529                                 if (!ops || ops != dev->rtnl_link_ops ||
2530                                     !ops->changelink)
2531                                         return -EOPNOTSUPP;
2532
2533                                 err = ops->changelink(dev, tb, data);
2534                                 if (err < 0)
2535                                         return err;
2536                                 status |= DO_SETLINK_NOTIFY;
2537                         }
2538
2539                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2540                                 if (!m_ops || !m_ops->slave_changelink)
2541                                         return -EOPNOTSUPP;
2542
2543                                 err = m_ops->slave_changelink(master_dev, dev,
2544                                                               tb, slave_data);
2545                                 if (err < 0)
2546                                         return err;
2547                                 status |= DO_SETLINK_NOTIFY;
2548                         }
2549
2550                         return do_setlink(skb, dev, ifm, tb, ifname, status);
2551                 }
2552
2553                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2554                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2555                                 return rtnl_group_changelink(skb, net,
2556                                                 nla_get_u32(tb[IFLA_GROUP]),
2557                                                 ifm, tb);
2558                         return -ENODEV;
2559                 }
2560
2561                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2562                         return -EOPNOTSUPP;
2563
2564                 if (!ops) {
2565 #ifdef CONFIG_MODULES
2566                         if (kind[0]) {
2567                                 __rtnl_unlock();
2568                                 request_module("rtnl-link-%s", kind);
2569                                 rtnl_lock();
2570                                 ops = rtnl_link_ops_get(kind);
2571                                 if (ops)
2572                                         goto replay;
2573                         }
2574 #endif
2575                         return -EOPNOTSUPP;
2576                 }
2577
2578                 if (!ops->setup)
2579                         return -EOPNOTSUPP;
2580
2581                 if (!ifname[0]) {
2582                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2583                         name_assign_type = NET_NAME_ENUM;
2584                 }
2585
2586                 dest_net = rtnl_link_get_net(net, tb);
2587                 if (IS_ERR(dest_net))
2588                         return PTR_ERR(dest_net);
2589
2590                 err = -EPERM;
2591                 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2592                         goto out;
2593
2594                 if (tb[IFLA_LINK_NETNSID]) {
2595                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2596
2597                         link_net = get_net_ns_by_id(dest_net, id);
2598                         if (!link_net) {
2599                                 err =  -EINVAL;
2600                                 goto out;
2601                         }
2602                         err = -EPERM;
2603                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2604                                 goto out;
2605                 }
2606
2607                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2608                                        name_assign_type, ops, tb);
2609                 if (IS_ERR(dev)) {
2610                         err = PTR_ERR(dev);
2611                         goto out;
2612                 }
2613
2614                 dev->ifindex = ifm->ifi_index;
2615
2616                 if (ops->newlink) {
2617                         err = ops->newlink(link_net ? : net, dev, tb, data);
2618                         /* Drivers should call free_netdev() in ->destructor
2619                          * and unregister it on failure after registration
2620                          * so that device could be finally freed in rtnl_unlock.
2621                          */
2622                         if (err < 0) {
2623                                 /* If device is not registered at all, free it now */
2624                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2625                                         free_netdev(dev);
2626                                 goto out;
2627                         }
2628                 } else {
2629                         err = register_netdevice(dev);
2630                         if (err < 0) {
2631                                 free_netdev(dev);
2632                                 goto out;
2633                         }
2634                 }
2635                 err = rtnl_configure_link(dev, ifm);
2636                 if (err < 0)
2637                         goto out_unregister;
2638                 if (link_net) {
2639                         err = dev_change_net_namespace(dev, dest_net, ifname);
2640                         if (err < 0)
2641                                 goto out_unregister;
2642                 }
2643 out:
2644                 if (link_net)
2645                         put_net(link_net);
2646                 put_net(dest_net);
2647                 return err;
2648 out_unregister:
2649                 if (ops->newlink) {
2650                         LIST_HEAD(list_kill);
2651
2652                         ops->dellink(dev, &list_kill);
2653                         unregister_netdevice_many(&list_kill);
2654                 } else {
2655                         unregister_netdevice(dev);
2656                 }
2657                 goto out;
2658         }
2659 }
2660
2661 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2662 {
2663         struct net *net = sock_net(skb->sk);
2664         struct ifinfomsg *ifm;
2665         char ifname[IFNAMSIZ];
2666         struct nlattr *tb[IFLA_MAX+1];
2667         struct net_device *dev = NULL;
2668         struct sk_buff *nskb;
2669         int err;
2670         u32 ext_filter_mask = 0;
2671
2672         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2673         if (err < 0)
2674                 return err;
2675
2676         if (tb[IFLA_IFNAME])
2677                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2678
2679         if (tb[IFLA_EXT_MASK])
2680                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2681
2682         ifm = nlmsg_data(nlh);
2683         if (ifm->ifi_index > 0)
2684                 dev = __dev_get_by_index(net, ifm->ifi_index);
2685         else if (tb[IFLA_IFNAME])
2686                 dev = __dev_get_by_name(net, ifname);
2687         else
2688                 return -EINVAL;
2689
2690         if (dev == NULL)
2691                 return -ENODEV;
2692
2693         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2694         if (nskb == NULL)
2695                 return -ENOBUFS;
2696
2697         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2698                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2699         if (err < 0) {
2700                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2701                 WARN_ON(err == -EMSGSIZE);
2702                 kfree_skb(nskb);
2703         } else
2704                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2705
2706         return err;
2707 }
2708
2709 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2710 {
2711         struct net *net = sock_net(skb->sk);
2712         struct net_device *dev;
2713         struct nlattr *tb[IFLA_MAX+1];
2714         u32 ext_filter_mask = 0;
2715         u16 min_ifinfo_dump_size = 0;
2716         int hdrlen;
2717
2718         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2719         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2720                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2721
2722         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2723                 if (tb[IFLA_EXT_MASK])
2724                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2725         }
2726
2727         if (!ext_filter_mask)
2728                 return NLMSG_GOODSIZE;
2729         /*
2730          * traverse the list of net devices and compute the minimum
2731          * buffer size based upon the filter mask.
2732          */
2733         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2734                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2735                                              if_nlmsg_size(dev,
2736                                                            ext_filter_mask));
2737         }
2738
2739         return min_ifinfo_dump_size;
2740 }
2741
2742 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2743 {
2744         int idx;
2745         int s_idx = cb->family;
2746
2747         if (s_idx == 0)
2748                 s_idx = 1;
2749         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2750                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2751                 if (idx < s_idx || idx == PF_PACKET)
2752                         continue;
2753                 if (rtnl_msg_handlers[idx] == NULL ||
2754                     rtnl_msg_handlers[idx][type].dumpit == NULL)
2755                         continue;
2756                 if (idx > s_idx) {
2757                         memset(&cb->args[0], 0, sizeof(cb->args));
2758                         cb->prev_seq = 0;
2759                         cb->seq = 0;
2760                 }
2761                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2762                         break;
2763         }
2764         cb->family = idx;
2765
2766         return skb->len;
2767 }
2768
2769 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2770                                        unsigned int change, gfp_t flags)
2771 {
2772         struct net *net = dev_net(dev);
2773         struct sk_buff *skb;
2774         int err = -ENOBUFS;
2775         size_t if_info_size;
2776
2777         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2778         if (skb == NULL)
2779                 goto errout;
2780
2781         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2782         if (err < 0) {
2783                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2784                 WARN_ON(err == -EMSGSIZE);
2785                 kfree_skb(skb);
2786                 goto errout;
2787         }
2788         return skb;
2789 errout:
2790         if (err < 0)
2791                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2792         return NULL;
2793 }
2794
2795 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2796 {
2797         struct net *net = dev_net(dev);
2798
2799         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2800 }
2801
2802 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2803                   gfp_t flags)
2804 {
2805         struct sk_buff *skb;
2806
2807         if (dev->reg_state != NETREG_REGISTERED)
2808                 return;
2809
2810         skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2811         if (skb)
2812                 rtmsg_ifinfo_send(skb, dev, flags);
2813 }
2814 EXPORT_SYMBOL(rtmsg_ifinfo);
2815
2816 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2817                                    struct net_device *dev,
2818                                    u8 *addr, u16 vid, u32 pid, u32 seq,
2819                                    int type, unsigned int flags,
2820                                    int nlflags, u16 ndm_state)
2821 {
2822         struct nlmsghdr *nlh;
2823         struct ndmsg *ndm;
2824
2825         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2826         if (!nlh)
2827                 return -EMSGSIZE;
2828
2829         ndm = nlmsg_data(nlh);
2830         ndm->ndm_family  = AF_BRIDGE;
2831         ndm->ndm_pad1    = 0;
2832         ndm->ndm_pad2    = 0;
2833         ndm->ndm_flags   = flags;
2834         ndm->ndm_type    = 0;
2835         ndm->ndm_ifindex = dev->ifindex;
2836         ndm->ndm_state   = ndm_state;
2837
2838         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2839                 goto nla_put_failure;
2840         if (vid)
2841                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2842                         goto nla_put_failure;
2843
2844         nlmsg_end(skb, nlh);
2845         return 0;
2846
2847 nla_put_failure:
2848         nlmsg_cancel(skb, nlh);
2849         return -EMSGSIZE;
2850 }
2851
2852 static inline size_t rtnl_fdb_nlmsg_size(void)
2853 {
2854         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2855 }
2856
2857 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
2858                             u16 ndm_state)
2859 {
2860         struct net *net = dev_net(dev);
2861         struct sk_buff *skb;
2862         int err = -ENOBUFS;
2863
2864         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2865         if (!skb)
2866                 goto errout;
2867
2868         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2869                                       0, 0, type, NTF_SELF, 0, ndm_state);
2870         if (err < 0) {
2871                 kfree_skb(skb);
2872                 goto errout;
2873         }
2874
2875         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2876         return;
2877 errout:
2878         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2879 }
2880
2881 /**
2882  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2883  */
2884 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2885                      struct nlattr *tb[],
2886                      struct net_device *dev,
2887                      const unsigned char *addr, u16 vid,
2888                      u16 flags)
2889 {
2890         int err = -EINVAL;
2891
2892         /* If aging addresses are supported device will need to
2893          * implement its own handler for this.
2894          */
2895         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2896                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2897                 return err;
2898         }
2899
2900         if (vid) {
2901                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2902                 return err;
2903         }
2904
2905         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2906                 err = dev_uc_add_excl(dev, addr);
2907         else if (is_multicast_ether_addr(addr))
2908                 err = dev_mc_add_excl(dev, addr);
2909
2910         /* Only return duplicate errors if NLM_F_EXCL is set */
2911         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2912                 err = 0;
2913
2914         return err;
2915 }
2916 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2917
2918 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2919 {
2920         u16 vid = 0;
2921
2922         if (vlan_attr) {
2923                 if (nla_len(vlan_attr) != sizeof(u16)) {
2924                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2925                         return -EINVAL;
2926                 }
2927
2928                 vid = nla_get_u16(vlan_attr);
2929
2930                 if (!vid || vid >= VLAN_VID_MASK) {
2931                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2932                                 vid);
2933                         return -EINVAL;
2934                 }
2935         }
2936         *p_vid = vid;
2937         return 0;
2938 }
2939
2940 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2941 {
2942         struct net *net = sock_net(skb->sk);
2943         struct ndmsg *ndm;
2944         struct nlattr *tb[NDA_MAX+1];
2945         struct net_device *dev;
2946         u8 *addr;
2947         u16 vid;
2948         int err;
2949
2950         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2951         if (err < 0)
2952                 return err;
2953
2954         ndm = nlmsg_data(nlh);
2955         if (ndm->ndm_ifindex == 0) {
2956                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2957                 return -EINVAL;
2958         }
2959
2960         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2961         if (dev == NULL) {
2962                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2963                 return -ENODEV;
2964         }
2965
2966         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2967                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2968                 return -EINVAL;
2969         }
2970
2971         addr = nla_data(tb[NDA_LLADDR]);
2972
2973         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2974         if (err)
2975                 return err;
2976
2977         err = -EOPNOTSUPP;
2978
2979         /* Support fdb on master device the net/bridge default case */
2980         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2981             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2982                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2983                 const struct net_device_ops *ops = br_dev->netdev_ops;
2984
2985                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2986                                        nlh->nlmsg_flags);
2987                 if (err)
2988                         goto out;
2989                 else
2990                         ndm->ndm_flags &= ~NTF_MASTER;
2991         }
2992
2993         /* Embedded bridge, macvlan, and any other device support */
2994         if ((ndm->ndm_flags & NTF_SELF)) {
2995                 if (dev->netdev_ops->ndo_fdb_add)
2996                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2997                                                            vid,
2998                                                            nlh->nlmsg_flags);
2999                 else
3000                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3001                                                nlh->nlmsg_flags);
3002
3003                 if (!err) {
3004                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3005                                         ndm->ndm_state);
3006                         ndm->ndm_flags &= ~NTF_SELF;
3007                 }
3008         }
3009 out:
3010         return err;
3011 }
3012
3013 /**
3014  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3015  */
3016 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3017                      struct nlattr *tb[],
3018                      struct net_device *dev,
3019                      const unsigned char *addr, u16 vid)
3020 {
3021         int err = -EINVAL;
3022
3023         /* If aging addresses are supported device will need to
3024          * implement its own handler for this.
3025          */
3026         if (!(ndm->ndm_state & NUD_PERMANENT)) {
3027                 pr_info("%s: FDB only supports static addresses\n", dev->name);
3028                 return err;
3029         }
3030
3031         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3032                 err = dev_uc_del(dev, addr);
3033         else if (is_multicast_ether_addr(addr))
3034                 err = dev_mc_del(dev, addr);
3035
3036         return err;
3037 }
3038 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3039
3040 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
3041 {
3042         struct net *net = sock_net(skb->sk);
3043         struct ndmsg *ndm;
3044         struct nlattr *tb[NDA_MAX+1];
3045         struct net_device *dev;
3046         int err = -EINVAL;
3047         __u8 *addr;
3048         u16 vid;
3049
3050         if (!netlink_capable(skb, CAP_NET_ADMIN))
3051                 return -EPERM;
3052
3053         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
3054         if (err < 0)
3055                 return err;
3056
3057         ndm = nlmsg_data(nlh);
3058         if (ndm->ndm_ifindex == 0) {
3059                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
3060                 return -EINVAL;
3061         }
3062
3063         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3064         if (dev == NULL) {
3065                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
3066                 return -ENODEV;
3067         }
3068
3069         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3070                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
3071                 return -EINVAL;
3072         }
3073
3074         addr = nla_data(tb[NDA_LLADDR]);
3075
3076         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
3077         if (err)
3078                 return err;
3079
3080         err = -EOPNOTSUPP;
3081
3082         /* Support fdb on master device the net/bridge default case */
3083         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3084             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3085                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3086                 const struct net_device_ops *ops = br_dev->netdev_ops;
3087
3088                 if (ops->ndo_fdb_del)
3089                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3090
3091                 if (err)
3092                         goto out;
3093                 else
3094                         ndm->ndm_flags &= ~NTF_MASTER;
3095         }
3096
3097         /* Embedded bridge, macvlan, and any other device support */
3098         if (ndm->ndm_flags & NTF_SELF) {
3099                 if (dev->netdev_ops->ndo_fdb_del)
3100                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3101                                                            vid);
3102                 else
3103                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3104
3105                 if (!err) {
3106                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3107                                         ndm->ndm_state);
3108                         ndm->ndm_flags &= ~NTF_SELF;
3109                 }
3110         }
3111 out:
3112         return err;
3113 }
3114
3115 static int nlmsg_populate_fdb(struct sk_buff *skb,
3116                               struct netlink_callback *cb,
3117                               struct net_device *dev,
3118                               int *idx,
3119                               struct netdev_hw_addr_list *list)
3120 {
3121         struct netdev_hw_addr *ha;
3122         int err;
3123         u32 portid, seq;
3124
3125         portid = NETLINK_CB(cb->skb).portid;
3126         seq = cb->nlh->nlmsg_seq;
3127
3128         list_for_each_entry(ha, &list->list, list) {
3129                 if (*idx < cb->args[2])
3130                         goto skip;
3131
3132                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3133                                               portid, seq,
3134                                               RTM_NEWNEIGH, NTF_SELF,
3135                                               NLM_F_MULTI, NUD_PERMANENT);
3136                 if (err < 0)
3137                         return err;
3138 skip:
3139                 *idx += 1;
3140         }
3141         return 0;
3142 }
3143
3144 /**
3145  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3146  * @nlh: netlink message header
3147  * @dev: netdevice
3148  *
3149  * Default netdevice operation to dump the existing unicast address list.
3150  * Returns number of addresses from list put in skb.
3151  */
3152 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3153                       struct netlink_callback *cb,
3154                       struct net_device *dev,
3155                       struct net_device *filter_dev,
3156                       int *idx)
3157 {
3158         int err;
3159
3160         netif_addr_lock_bh(dev);
3161         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3162         if (err)
3163                 goto out;
3164         nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3165 out:
3166         netif_addr_unlock_bh(dev);
3167         return err;
3168 }
3169 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3170
3171 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3172 {
3173         struct net_device *dev;
3174         struct nlattr *tb[IFLA_MAX+1];
3175         struct net_device *br_dev = NULL;
3176         const struct net_device_ops *ops = NULL;
3177         const struct net_device_ops *cops = NULL;
3178         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3179         struct net *net = sock_net(skb->sk);
3180         struct hlist_head *head;
3181         int brport_idx = 0;
3182         int br_idx = 0;
3183         int h, s_h;
3184         int idx = 0, s_idx;
3185         int err = 0;
3186         int fidx = 0;
3187
3188         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
3189                         ifla_policy) == 0) {
3190                 if (tb[IFLA_MASTER])
3191                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
3192         }
3193
3194         brport_idx = ifm->ifi_index;
3195
3196         if (br_idx) {
3197                 br_dev = __dev_get_by_index(net, br_idx);
3198                 if (!br_dev)
3199                         return -ENODEV;
3200
3201                 ops = br_dev->netdev_ops;
3202         }
3203
3204         s_h = cb->args[0];
3205         s_idx = cb->args[1];
3206
3207         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3208                 idx = 0;
3209                 head = &net->dev_index_head[h];
3210                 hlist_for_each_entry(dev, head, index_hlist) {
3211
3212                         if (brport_idx && (dev->ifindex != brport_idx))
3213                                 continue;
3214
3215                         if (!br_idx) { /* user did not specify a specific bridge */
3216                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3217                                         br_dev = netdev_master_upper_dev_get(dev);
3218                                         cops = br_dev->netdev_ops;
3219                                 }
3220                         } else {
3221                                 if (dev != br_dev &&
3222                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
3223                                         continue;
3224
3225                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
3226                                     !(dev->priv_flags & IFF_EBRIDGE))
3227                                         continue;
3228                                 cops = ops;
3229                         }
3230
3231                         if (idx < s_idx)
3232                                 goto cont;
3233
3234                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
3235                                 if (cops && cops->ndo_fdb_dump) {
3236                                         err = cops->ndo_fdb_dump(skb, cb,
3237                                                                 br_dev, dev,
3238                                                                 &fidx);
3239                                         if (err == -EMSGSIZE)
3240                                                 goto out;
3241                                 }
3242                         }
3243
3244                         if (dev->netdev_ops->ndo_fdb_dump)
3245                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3246                                                                     dev, NULL,
3247                                                                     &fidx);
3248                         else
3249                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
3250                                                         &fidx);
3251                         if (err == -EMSGSIZE)
3252                                 goto out;
3253
3254                         cops = NULL;
3255
3256                         /* reset fdb offset to 0 for rest of the interfaces */
3257                         cb->args[2] = 0;
3258                         fidx = 0;
3259 cont:
3260                         idx++;
3261                 }
3262         }
3263
3264 out:
3265         cb->args[0] = h;
3266         cb->args[1] = idx;
3267         cb->args[2] = fidx;
3268
3269         return skb->len;
3270 }
3271
3272 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3273                                unsigned int attrnum, unsigned int flag)
3274 {
3275         if (mask & flag)
3276                 return nla_put_u8(skb, attrnum, !!(flags & flag));
3277         return 0;
3278 }
3279
3280 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3281                             struct net_device *dev, u16 mode,
3282                             u32 flags, u32 mask, int nlflags,
3283                             u32 filter_mask,
3284                             int (*vlan_fill)(struct sk_buff *skb,
3285                                              struct net_device *dev,
3286                                              u32 filter_mask))
3287 {
3288         struct nlmsghdr *nlh;
3289         struct ifinfomsg *ifm;
3290         struct nlattr *br_afspec;
3291         struct nlattr *protinfo;
3292         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3293         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3294         int err = 0;
3295
3296         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3297         if (nlh == NULL)
3298                 return -EMSGSIZE;
3299
3300         ifm = nlmsg_data(nlh);
3301         ifm->ifi_family = AF_BRIDGE;
3302         ifm->__ifi_pad = 0;
3303         ifm->ifi_type = dev->type;
3304         ifm->ifi_index = dev->ifindex;
3305         ifm->ifi_flags = dev_get_flags(dev);
3306         ifm->ifi_change = 0;
3307
3308
3309         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3310             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3311             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3312             (br_dev &&
3313              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3314             (dev->addr_len &&
3315              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3316             (dev->ifindex != dev_get_iflink(dev) &&
3317              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3318                 goto nla_put_failure;
3319
3320         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3321         if (!br_afspec)
3322                 goto nla_put_failure;
3323
3324         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3325                 nla_nest_cancel(skb, br_afspec);
3326                 goto nla_put_failure;
3327         }
3328
3329         if (mode != BRIDGE_MODE_UNDEF) {
3330                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3331                         nla_nest_cancel(skb, br_afspec);
3332                         goto nla_put_failure;
3333                 }
3334         }
3335         if (vlan_fill) {
3336                 err = vlan_fill(skb, dev, filter_mask);
3337                 if (err) {
3338                         nla_nest_cancel(skb, br_afspec);
3339                         goto nla_put_failure;
3340                 }
3341         }
3342         nla_nest_end(skb, br_afspec);
3343
3344         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3345         if (!protinfo)
3346                 goto nla_put_failure;
3347
3348         if (brport_nla_put_flag(skb, flags, mask,
3349                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3350             brport_nla_put_flag(skb, flags, mask,
3351                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3352             brport_nla_put_flag(skb, flags, mask,
3353                                 IFLA_BRPORT_FAST_LEAVE,
3354                                 BR_MULTICAST_FAST_LEAVE) ||
3355             brport_nla_put_flag(skb, flags, mask,
3356                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3357             brport_nla_put_flag(skb, flags, mask,
3358                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3359             brport_nla_put_flag(skb, flags, mask,
3360                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3361             brport_nla_put_flag(skb, flags, mask,
3362                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3363             brport_nla_put_flag(skb, flags, mask,
3364                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3365                 nla_nest_cancel(skb, protinfo);
3366                 goto nla_put_failure;
3367         }
3368
3369         nla_nest_end(skb, protinfo);
3370
3371         nlmsg_end(skb, nlh);
3372         return 0;
3373 nla_put_failure:
3374         nlmsg_cancel(skb, nlh);
3375         return err ? err : -EMSGSIZE;
3376 }
3377 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3378
3379 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3380 {
3381         struct net *net = sock_net(skb->sk);
3382         struct net_device *dev;
3383         int idx = 0;
3384         u32 portid = NETLINK_CB(cb->skb).portid;
3385         u32 seq = cb->nlh->nlmsg_seq;
3386         u32 filter_mask = 0;
3387         int err;
3388
3389         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3390                 struct nlattr *extfilt;
3391
3392                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3393                                           IFLA_EXT_MASK);
3394                 if (extfilt) {
3395                         if (nla_len(extfilt) < sizeof(filter_mask))
3396                                 return -EINVAL;
3397
3398                         filter_mask = nla_get_u32(extfilt);
3399                 }
3400         }
3401
3402         rcu_read_lock();
3403         for_each_netdev_rcu(net, dev) {
3404                 const struct net_device_ops *ops = dev->netdev_ops;
3405                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3406
3407                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3408                         if (idx >= cb->args[0]) {
3409                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
3410                                                 skb, portid, seq, dev,
3411                                                 filter_mask, NLM_F_MULTI);
3412                                 if (err < 0 && err != -EOPNOTSUPP)
3413                                         break;
3414                         }
3415                         idx++;
3416                 }
3417
3418                 if (ops->ndo_bridge_getlink) {
3419                         if (idx >= cb->args[0]) {
3420                                 err = ops->ndo_bridge_getlink(skb, portid,
3421                                                               seq, dev,
3422                                                               filter_mask,
3423                                                               NLM_F_MULTI);
3424                                 if (err < 0 && err != -EOPNOTSUPP)
3425                                         break;
3426                         }
3427                         idx++;
3428                 }
3429         }
3430         rcu_read_unlock();
3431         cb->args[0] = idx;
3432
3433         return skb->len;
3434 }
3435
3436 static inline size_t bridge_nlmsg_size(void)
3437 {
3438         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3439                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
3440                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
3441                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
3442                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
3443                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
3444                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
3445                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
3446                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3447                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
3448                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
3449 }
3450
3451 static int rtnl_bridge_notify(struct net_device *dev)
3452 {
3453         struct net *net = dev_net(dev);
3454         struct sk_buff *skb;
3455         int err = -EOPNOTSUPP;
3456
3457         if (!dev->netdev_ops->ndo_bridge_getlink)
3458                 return 0;
3459
3460         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3461         if (!skb) {
3462                 err = -ENOMEM;
3463                 goto errout;
3464         }
3465
3466         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3467         if (err < 0)
3468                 goto errout;
3469
3470         if (!skb->len)
3471                 goto errout;
3472
3473         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3474         return 0;
3475 errout:
3476         WARN_ON(err == -EMSGSIZE);
3477         kfree_skb(skb);
3478         if (err)
3479                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3480         return err;
3481 }
3482
3483 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3484 {
3485         struct net *net = sock_net(skb->sk);
3486         struct ifinfomsg *ifm;
3487         struct net_device *dev;
3488         struct nlattr *br_spec, *attr = NULL;
3489         int rem, err = -EOPNOTSUPP;
3490         u16 flags = 0;
3491         bool have_flags = false;
3492
3493         if (nlmsg_len(nlh) < sizeof(*ifm))
3494                 return -EINVAL;
3495
3496         ifm = nlmsg_data(nlh);
3497         if (ifm->ifi_family != AF_BRIDGE)
3498                 return -EPFNOSUPPORT;
3499
3500         dev = __dev_get_by_index(net, ifm->ifi_index);
3501         if (!dev) {
3502                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3503                 return -ENODEV;
3504         }
3505
3506         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3507         if (br_spec) {
3508                 nla_for_each_nested(attr, br_spec, rem) {
3509                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3510                                 if (nla_len(attr) < sizeof(flags))
3511                                         return -EINVAL;
3512
3513                                 have_flags = true;
3514                                 flags = nla_get_u16(attr);
3515                                 break;
3516                         }
3517                 }
3518         }
3519
3520         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3521                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3522
3523                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3524                         err = -EOPNOTSUPP;
3525                         goto out;
3526                 }
3527
3528                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3529                 if (err)
3530                         goto out;
3531
3532                 flags &= ~BRIDGE_FLAGS_MASTER;
3533         }
3534
3535         if ((flags & BRIDGE_FLAGS_SELF)) {
3536                 if (!dev->netdev_ops->ndo_bridge_setlink)
3537                         err = -EOPNOTSUPP;
3538                 else
3539                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3540                                                                   flags);
3541                 if (!err) {
3542                         flags &= ~BRIDGE_FLAGS_SELF;
3543
3544                         /* Generate event to notify upper layer of bridge
3545                          * change
3546                          */
3547                         err = rtnl_bridge_notify(dev);
3548                 }
3549         }
3550
3551         if (have_flags)
3552                 memcpy(nla_data(attr), &flags, sizeof(flags));
3553 out:
3554         return err;
3555 }
3556
3557 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3558 {
3559         struct net *net = sock_net(skb->sk);
3560         struct ifinfomsg *ifm;
3561         struct net_device *dev;
3562         struct nlattr *br_spec, *attr = NULL;
3563         int rem, err = -EOPNOTSUPP;
3564         u16 flags = 0;
3565         bool have_flags = false;
3566
3567         if (nlmsg_len(nlh) < sizeof(*ifm))
3568                 return -EINVAL;
3569
3570         ifm = nlmsg_data(nlh);
3571         if (ifm->ifi_family != AF_BRIDGE)
3572                 return -EPFNOSUPPORT;
3573
3574         dev = __dev_get_by_index(net, ifm->ifi_index);
3575         if (!dev) {
3576                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3577                 return -ENODEV;
3578         }
3579
3580         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3581         if (br_spec) {
3582                 nla_for_each_nested(attr, br_spec, rem) {
3583                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3584                                 if (nla_len(attr) < sizeof(flags))
3585                                         return -EINVAL;
3586
3587                                 have_flags = true;
3588                                 flags = nla_get_u16(attr);
3589                                 break;
3590                         }
3591                 }
3592         }
3593
3594         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3595                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3596
3597                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3598                         err = -EOPNOTSUPP;
3599                         goto out;
3600                 }
3601
3602                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3603                 if (err)
3604                         goto out;
3605
3606                 flags &= ~BRIDGE_FLAGS_MASTER;
3607         }
3608
3609         if ((flags & BRIDGE_FLAGS_SELF)) {
3610                 if (!dev->netdev_ops->ndo_bridge_dellink)
3611                         err = -EOPNOTSUPP;
3612                 else
3613                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3614                                                                   flags);
3615
3616                 if (!err) {
3617                         flags &= ~BRIDGE_FLAGS_SELF;
3618
3619                         /* Generate event to notify upper layer of bridge
3620                          * change
3621                          */
3622                         err = rtnl_bridge_notify(dev);
3623                 }
3624         }
3625
3626         if (have_flags)
3627                 memcpy(nla_data(attr), &flags, sizeof(flags));
3628 out:
3629         return err;
3630 }
3631
3632 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
3633 {
3634         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
3635                (!idxattr || idxattr == attrid);
3636 }
3637
3638 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
3639 static int rtnl_get_offload_stats_attr_size(int attr_id)
3640 {
3641         switch (attr_id) {
3642         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
3643                 return sizeof(struct rtnl_link_stats64);
3644         }
3645
3646         return 0;
3647 }
3648
3649 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
3650                                   int *prividx)
3651 {
3652         struct nlattr *attr = NULL;
3653         int attr_id, size;
3654         void *attr_data;
3655         int err;
3656
3657         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3658               dev->netdev_ops->ndo_get_offload_stats))
3659                 return -ENODATA;
3660
3661         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3662              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3663                 if (attr_id < *prividx)
3664                         continue;
3665
3666                 size = rtnl_get_offload_stats_attr_size(attr_id);
3667                 if (!size)
3668                         continue;
3669
3670                 if (!dev->netdev_ops->ndo_has_offload_stats(attr_id))
3671                         continue;
3672
3673                 attr = nla_reserve_64bit(skb, attr_id, size,
3674                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
3675                 if (!attr)
3676                         goto nla_put_failure;
3677
3678                 attr_data = nla_data(attr);
3679                 memset(attr_data, 0, size);
3680                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
3681                                                              attr_data);
3682                 if (err)
3683                         goto get_offload_stats_failure;
3684         }
3685
3686         if (!attr)
3687                 return -ENODATA;
3688
3689         *prividx = 0;
3690         return 0;
3691
3692 nla_put_failure:
3693         err = -EMSGSIZE;
3694 get_offload_stats_failure:
3695         *prividx = attr_id;
3696         return err;
3697 }
3698
3699 static int rtnl_get_offload_stats_size(const struct net_device *dev)
3700 {
3701         int nla_size = 0;
3702         int attr_id;
3703         int size;
3704
3705         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3706               dev->netdev_ops->ndo_get_offload_stats))
3707                 return 0;
3708
3709         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3710              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3711                 if (!dev->netdev_ops->ndo_has_offload_stats(attr_id))
3712                         continue;
3713                 size = rtnl_get_offload_stats_attr_size(attr_id);
3714                 nla_size += nla_total_size_64bit(size);
3715         }
3716
3717         if (nla_size != 0)
3718                 nla_size += nla_total_size(0);
3719
3720         return nla_size;
3721 }
3722
3723 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
3724                                int type, u32 pid, u32 seq, u32 change,
3725                                unsigned int flags, unsigned int filter_mask,
3726                                int *idxattr, int *prividx)
3727 {
3728         struct if_stats_msg *ifsm;
3729         struct nlmsghdr *nlh;
3730         struct nlattr *attr;
3731         int s_prividx = *prividx;
3732         int err;
3733
3734         ASSERT_RTNL();
3735
3736         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
3737         if (!nlh)
3738                 return -EMSGSIZE;
3739
3740         ifsm = nlmsg_data(nlh);
3741         ifsm->ifindex = dev->ifindex;
3742         ifsm->filter_mask = filter_mask;
3743
3744         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
3745                 struct rtnl_link_stats64 *sp;
3746
3747                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
3748                                          sizeof(struct rtnl_link_stats64),
3749                                          IFLA_STATS_UNSPEC);
3750                 if (!attr)
3751                         goto nla_put_failure;
3752
3753                 sp = nla_data(attr);
3754                 dev_get_stats(dev, sp);
3755         }
3756
3757         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
3758                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3759
3760                 if (ops && ops->fill_linkxstats) {
3761                         *idxattr = IFLA_STATS_LINK_XSTATS;
3762                         attr = nla_nest_start(skb,
3763                                               IFLA_STATS_LINK_XSTATS);
3764                         if (!attr)
3765                                 goto nla_put_failure;
3766
3767                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3768                         nla_nest_end(skb, attr);
3769                         if (err)
3770                                 goto nla_put_failure;
3771                         *idxattr = 0;
3772                 }
3773         }
3774
3775         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
3776                              *idxattr)) {
3777                 const struct rtnl_link_ops *ops = NULL;
3778                 const struct net_device *master;
3779
3780                 master = netdev_master_upper_dev_get(dev);
3781                 if (master)
3782                         ops = master->rtnl_link_ops;
3783                 if (ops && ops->fill_linkxstats) {
3784                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
3785                         attr = nla_nest_start(skb,
3786                                               IFLA_STATS_LINK_XSTATS_SLAVE);
3787                         if (!attr)
3788                                 goto nla_put_failure;
3789
3790                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3791                         nla_nest_end(skb, attr);
3792                         if (err)
3793                                 goto nla_put_failure;
3794                         *idxattr = 0;
3795                 }
3796         }
3797
3798         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
3799                              *idxattr)) {
3800                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
3801                 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
3802                 if (!attr)
3803                         goto nla_put_failure;
3804
3805                 err = rtnl_get_offload_stats(skb, dev, prividx);
3806                 if (err == -ENODATA)
3807                         nla_nest_cancel(skb, attr);
3808                 else
3809                         nla_nest_end(skb, attr);
3810
3811                 if (err && err != -ENODATA)
3812                         goto nla_put_failure;
3813                 *idxattr = 0;
3814         }
3815
3816         nlmsg_end(skb, nlh);
3817
3818         return 0;
3819
3820 nla_put_failure:
3821         /* not a multi message or no progress mean a real error */
3822         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
3823                 nlmsg_cancel(skb, nlh);
3824         else
3825                 nlmsg_end(skb, nlh);
3826
3827         return -EMSGSIZE;
3828 }
3829
3830 static size_t if_nlmsg_stats_size(const struct net_device *dev,
3831                                   u32 filter_mask)
3832 {
3833         size_t size = 0;
3834
3835         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
3836                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
3837
3838         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
3839                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3840                 int attr = IFLA_STATS_LINK_XSTATS;
3841
3842                 if (ops && ops->get_linkxstats_size) {
3843                         size += nla_total_size(ops->get_linkxstats_size(dev,
3844                                                                         attr));
3845                         /* for IFLA_STATS_LINK_XSTATS */
3846                         size += nla_total_size(0);
3847                 }
3848         }
3849
3850         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
3851                 struct net_device *_dev = (struct net_device *)dev;
3852                 const struct rtnl_link_ops *ops = NULL;
3853                 const struct net_device *master;
3854
3855                 /* netdev_master_upper_dev_get can't take const */
3856                 master = netdev_master_upper_dev_get(_dev);
3857                 if (master)
3858                         ops = master->rtnl_link_ops;
3859                 if (ops && ops->get_linkxstats_size) {
3860                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
3861
3862                         size += nla_total_size(ops->get_linkxstats_size(dev,
3863                                                                         attr));
3864                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
3865                         size += nla_total_size(0);
3866                 }
3867         }
3868
3869         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
3870                 size += rtnl_get_offload_stats_size(dev);
3871
3872         return size;
3873 }
3874
3875 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh)
3876 {
3877         struct net *net = sock_net(skb->sk);
3878         struct net_device *dev = NULL;
3879         int idxattr = 0, prividx = 0;
3880         struct if_stats_msg *ifsm;
3881         struct sk_buff *nskb;
3882         u32 filter_mask;
3883         int err;
3884
3885         ifsm = nlmsg_data(nlh);
3886         if (ifsm->ifindex > 0)
3887                 dev = __dev_get_by_index(net, ifsm->ifindex);
3888         else
3889                 return -EINVAL;
3890
3891         if (!dev)
3892                 return -ENODEV;
3893
3894         filter_mask = ifsm->filter_mask;
3895         if (!filter_mask)
3896                 return -EINVAL;
3897
3898         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
3899         if (!nskb)
3900                 return -ENOBUFS;
3901
3902         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
3903                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
3904                                   0, filter_mask, &idxattr, &prividx);
3905         if (err < 0) {
3906                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
3907                 WARN_ON(err == -EMSGSIZE);
3908                 kfree_skb(nskb);
3909         } else {
3910                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3911         }
3912
3913         return err;
3914 }
3915
3916 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
3917 {
3918         int h, s_h, err, s_idx, s_idxattr, s_prividx;
3919         struct net *net = sock_net(skb->sk);
3920         unsigned int flags = NLM_F_MULTI;
3921         struct if_stats_msg *ifsm;
3922         struct hlist_head *head;
3923         struct net_device *dev;
3924         u32 filter_mask = 0;
3925         int idx = 0;
3926
3927         s_h = cb->args[0];
3928         s_idx = cb->args[1];
3929         s_idxattr = cb->args[2];
3930         s_prividx = cb->args[3];
3931
3932         cb->seq = net->dev_base_seq;
3933
3934         ifsm = nlmsg_data(cb->nlh);
3935         filter_mask = ifsm->filter_mask;
3936         if (!filter_mask)
3937                 return -EINVAL;
3938
3939         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3940                 idx = 0;
3941                 head = &net->dev_index_head[h];
3942                 hlist_for_each_entry(dev, head, index_hlist) {
3943                         if (idx < s_idx)
3944                                 goto cont;
3945                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
3946                                                   NETLINK_CB(cb->skb).portid,
3947                                                   cb->nlh->nlmsg_seq, 0,
3948                                                   flags, filter_mask,
3949                                                   &s_idxattr, &s_prividx);
3950                         /* If we ran out of room on the first message,
3951                          * we're in trouble
3952                          */
3953                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
3954
3955                         if (err < 0)
3956                                 goto out;
3957                         s_prividx = 0;
3958                         s_idxattr = 0;
3959                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3960 cont:
3961                         idx++;
3962                 }
3963         }
3964 out:
3965         cb->args[3] = s_prividx;
3966         cb->args[2] = s_idxattr;
3967         cb->args[1] = idx;
3968         cb->args[0] = h;
3969
3970         return skb->len;
3971 }
3972
3973 /* Process one rtnetlink message. */
3974
3975 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3976 {
3977         struct net *net = sock_net(skb->sk);
3978         rtnl_doit_func doit;
3979         int kind;
3980         int family;
3981         int type;
3982         int err;
3983
3984         type = nlh->nlmsg_type;
3985         if (type > RTM_MAX)
3986                 return -EOPNOTSUPP;
3987
3988         type -= RTM_BASE;
3989
3990         /* All the messages must have at least 1 byte length */
3991         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3992                 return 0;
3993
3994         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3995         kind = type&3;
3996
3997         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3998                 return -EPERM;
3999
4000         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
4001                 struct sock *rtnl;
4002                 rtnl_dumpit_func dumpit;
4003                 rtnl_calcit_func calcit;
4004                 u16 min_dump_alloc = 0;
4005
4006                 dumpit = rtnl_get_dumpit(family, type);
4007                 if (dumpit == NULL)
4008                         return -EOPNOTSUPP;
4009                 calcit = rtnl_get_calcit(family, type);
4010                 if (calcit)
4011                         min_dump_alloc = calcit(skb, nlh);
4012
4013                 __rtnl_unlock();
4014                 rtnl = net->rtnl;
4015                 {
4016                         struct netlink_dump_control c = {
4017                                 .dump           = dumpit,
4018                                 .min_dump_alloc = min_dump_alloc,
4019                         };
4020                         err = netlink_dump_start(rtnl, skb, nlh, &c);
4021                 }
4022                 rtnl_lock();
4023                 return err;
4024         }
4025
4026         doit = rtnl_get_doit(family, type);
4027         if (doit == NULL)
4028                 return -EOPNOTSUPP;
4029
4030         return doit(skb, nlh);
4031 }
4032
4033 static void rtnetlink_rcv(struct sk_buff *skb)
4034 {
4035         rtnl_lock();
4036         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
4037         rtnl_unlock();
4038 }
4039
4040 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
4041 {
4042         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4043
4044         switch (event) {
4045         case NETDEV_UP:
4046         case NETDEV_DOWN:
4047         case NETDEV_PRE_UP:
4048         case NETDEV_POST_INIT:
4049         case NETDEV_REGISTER:
4050         case NETDEV_CHANGE:
4051         case NETDEV_PRE_TYPE_CHANGE:
4052         case NETDEV_GOING_DOWN:
4053         case NETDEV_UNREGISTER:
4054         case NETDEV_UNREGISTER_FINAL:
4055         case NETDEV_RELEASE:
4056         case NETDEV_JOIN:
4057         case NETDEV_BONDING_INFO:
4058                 break;
4059         default:
4060                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
4061                 break;
4062         }
4063         return NOTIFY_DONE;
4064 }
4065
4066 static struct notifier_block rtnetlink_dev_notifier = {
4067         .notifier_call  = rtnetlink_event,
4068 };
4069
4070
4071 static int __net_init rtnetlink_net_init(struct net *net)
4072 {
4073         struct sock *sk;
4074         struct netlink_kernel_cfg cfg = {
4075                 .groups         = RTNLGRP_MAX,
4076                 .input          = rtnetlink_rcv,
4077                 .cb_mutex       = &rtnl_mutex,
4078                 .flags          = NL_CFG_F_NONROOT_RECV,
4079         };
4080
4081         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
4082         if (!sk)
4083                 return -ENOMEM;
4084         net->rtnl = sk;
4085         return 0;
4086 }
4087
4088 static void __net_exit rtnetlink_net_exit(struct net *net)
4089 {
4090         netlink_kernel_release(net->rtnl);
4091         net->rtnl = NULL;
4092 }
4093
4094 static struct pernet_operations rtnetlink_net_ops = {
4095         .init = rtnetlink_net_init,
4096         .exit = rtnetlink_net_exit,
4097 };
4098
4099 void __init rtnetlink_init(void)
4100 {
4101         if (register_pernet_subsys(&rtnetlink_net_ops))
4102                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
4103
4104         register_netdevice_notifier(&rtnetlink_dev_notifier);
4105
4106         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
4107                       rtnl_dump_ifinfo, rtnl_calcit);
4108         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
4109         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
4110         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
4111
4112         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
4113         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
4114
4115         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
4116         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
4117         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
4118
4119         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
4120         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
4121         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
4122
4123         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
4124                       NULL);
4125 }