net/core/rtnetlink.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Routing netlink socket interface: protocol independent part.
   7  *
   8  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   9  *
  10  *              This program is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  *
  15  *      Fixes:
  16  *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
  17  */
  18
  19 #include <linux/errno.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/socket.h>
  23 #include <linux/kernel.h>
  24 #include <linux/timer.h>
  25 #include <linux/string.h>
  26 #include <linux/sockios.h>
  27 #include <linux/net.h>
  28 #include <linux/fcntl.h>
  29 #include <linux/mm.h>
  30 #include <linux/slab.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/capability.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/init.h>
  35 #include <linux/security.h>
  36 #include <linux/mutex.h>
  37 #include <linux/if_addr.h>
  38 #include <linux/if_bridge.h>
  39 #include <linux/if_vlan.h>
  40 #include <linux/pci.h>
  41 #include <linux/etherdevice.h>
  42
  43 #include <asm/uaccess.h>
  44
  45 #include <linux/inet.h>
  46 #include <linux/netdevice.h>
  47 #include <net/switchdev.h>
  48 #include <net/ip.h>
  49 #include <net/protocol.h>
  50 #include <net/arp.h>
  51 #include <net/route.h>
  52 #include <net/udp.h>
  53 #include <net/tcp.h>
  54 #include <net/sock.h>
  55 #include <net/pkt_sched.h>
  56 #include <net/fib_rules.h>
  57 #include <net/rtnetlink.h>
  58 #include <net/net_namespace.h>
  59
  60 struct rtnl_link {
  61         rtnl_doit_func          doit;
  62         rtnl_dumpit_func        dumpit;
  63         rtnl_calcit_func        calcit;
  64 };
  65
  66 static DEFINE_MUTEX(rtnl_mutex);
  67
  68 void rtnl_lock(void)
  69 {
  70         mutex_lock(&rtnl_mutex);
  71 }
  72 EXPORT_SYMBOL(rtnl_lock);
  73
  74 static struct sk_buff *defer_kfree_skb_list;
  75 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
  76 {
  77         if (head && tail) {
  78                 tail->next = defer_kfree_skb_list;
  79                 defer_kfree_skb_list = head;
  80         }
  81 }
  82 EXPORT_SYMBOL(rtnl_kfree_skbs);
  83
  84 void __rtnl_unlock(void)
  85 {
  86         struct sk_buff *head = defer_kfree_skb_list;
  87
  88         defer_kfree_skb_list = NULL;
  89
  90         mutex_unlock(&rtnl_mutex);
  91
  92         while (head) {
  93                 struct sk_buff *next = head->next;
  94
  95                 kfree_skb(head);
  96                 cond_resched();
  97                 head = next;
  98         }
  99 }
 100
 101 void rtnl_unlock(void)
 102 {
 103         /* This fellow will unlock it for us. */
 104         netdev_run_todo();
 105 }
 106 EXPORT_SYMBOL(rtnl_unlock);
 107
 108 int rtnl_trylock(void)
 109 {
 110         return mutex_trylock(&rtnl_mutex);
 111 }
 112 EXPORT_SYMBOL(rtnl_trylock);
 113
 114 int rtnl_is_locked(void)
 115 {
 116         return mutex_is_locked(&rtnl_mutex);
 117 }
 118 EXPORT_SYMBOL(rtnl_is_locked);
 119
 120 #ifdef CONFIG_PROVE_LOCKING
 121 bool lockdep_rtnl_is_held(void)
 122 {
 123         return lockdep_is_held(&rtnl_mutex);
 124 }
 125 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 126 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 127
 128 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 129
 130 static inline int rtm_msgindex(int msgtype)
 131 {
 132         int msgindex = msgtype - RTM_BASE;
 133
 134         /*
 135          * msgindex < 0 implies someone tried to register a netlink
 136          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 137          * the message type has not been added to linux/rtnetlink.h
 138          */
 139         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 140
 141         return msgindex;
 142 }
 143
 144 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
 145 {
 146         struct rtnl_link *tab;
 147
 148         if (protocol <= RTNL_FAMILY_MAX)
 149                 tab = rtnl_msg_handlers[protocol];
 150         else
 151                 tab = NULL;
 152
 153         if (tab == NULL || tab[msgindex].doit == NULL)
 154                 tab = rtnl_msg_handlers[PF_UNSPEC];
 155
 156         return tab[msgindex].doit;
 157 }
 158
 159 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
 160 {
 161         struct rtnl_link *tab;
 162
 163         if (protocol <= RTNL_FAMILY_MAX)
 164                 tab = rtnl_msg_handlers[protocol];
 165         else
 166                 tab = NULL;
 167
 168         if (tab == NULL || tab[msgindex].dumpit == NULL)
 169                 tab = rtnl_msg_handlers[PF_UNSPEC];
 170
 171         return tab[msgindex].dumpit;
 172 }
 173
 174 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
 175 {
 176         struct rtnl_link *tab;
 177
 178         if (protocol <= RTNL_FAMILY_MAX)
 179                 tab = rtnl_msg_handlers[protocol];
 180         else
 181                 tab = NULL;
 182
 183         if (tab == NULL || tab[msgindex].calcit == NULL)
 184                 tab = rtnl_msg_handlers[PF_UNSPEC];
 185
 186         return tab[msgindex].calcit;
 187 }
 188
 189 /**
 190  * __rtnl_register - Register a rtnetlink message type
 191  * @protocol: Protocol family or PF_UNSPEC
 192  * @msgtype: rtnetlink message type
 193  * @doit: Function pointer called for each request message
 194  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 195  * @calcit: Function pointer to calc size of dump message
 196  *
 197  * Registers the specified function pointers (at least one of them has
 198  * to be non-NULL) to be called whenever a request message for the
 199  * specified protocol family and message type is received.
 200  *
 201  * The special protocol family PF_UNSPEC may be used to define fallback
 202  * function pointers for the case when no entry for the specific protocol
 203  * family exists.
 204  *
 205  * Returns 0 on success or a negative error code.
 206  */
 207 int __rtnl_register(int protocol, int msgtype,
 208                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 209                     rtnl_calcit_func calcit)
 210 {
 211         struct rtnl_link *tab;
 212         int msgindex;
 213
 214         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 215         msgindex = rtm_msgindex(msgtype);
 216
 217         tab = rtnl_msg_handlers[protocol];
 218         if (tab == NULL) {
 219                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 220                 if (tab == NULL)
 221                         return -ENOBUFS;
 222
 223                 rtnl_msg_handlers[protocol] = tab;
 224         }
 225
 226         if (doit)
 227                 tab[msgindex].doit = doit;
 228
 229         if (dumpit)
 230                 tab[msgindex].dumpit = dumpit;
 231
 232         if (calcit)
 233                 tab[msgindex].calcit = calcit;
 234
 235         return 0;
 236 }
 237 EXPORT_SYMBOL_GPL(__rtnl_register);
 238
 239 /**
 240  * rtnl_register - Register a rtnetlink message type
 241  *
 242  * Identical to __rtnl_register() but panics on failure. This is useful
 243  * as failure of this function is very unlikely, it can only happen due
 244  * to lack of memory when allocating the chain to store all message
 245  * handlers for a protocol. Meant for use in init functions where lack
 246  * of memory implies no sense in continuing.
 247  */
 248 void rtnl_register(int protocol, int msgtype,
 249                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 250                    rtnl_calcit_func calcit)
 251 {
 252         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
 253                 panic("Unable to register rtnetlink message handler, "
 254                       "protocol = %d, message type = %d\n",
 255                       protocol, msgtype);
 256 }
 257 EXPORT_SYMBOL_GPL(rtnl_register);
 258
 259 /**
 260  * rtnl_unregister - Unregister a rtnetlink message type
 261  * @protocol: Protocol family or PF_UNSPEC
 262  * @msgtype: rtnetlink message type
 263  *
 264  * Returns 0 on success or a negative error code.
 265  */
 266 int rtnl_unregister(int protocol, int msgtype)
 267 {
 268         int msgindex;
 269
 270         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 271         msgindex = rtm_msgindex(msgtype);
 272
 273         if (rtnl_msg_handlers[protocol] == NULL)
 274                 return -ENOENT;
 275
 276         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 277         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
 278
 279         return 0;
 280 }
 281 EXPORT_SYMBOL_GPL(rtnl_unregister);
 282
 283 /**
 284  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 285  * @protocol : Protocol family or PF_UNSPEC
 286  *
 287  * Identical to calling rtnl_unregster() for all registered message types
 288  * of a certain protocol family.
 289  */
 290 void rtnl_unregister_all(int protocol)
 291 {
 292         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 293
 294         kfree(rtnl_msg_handlers[protocol]);
 295         rtnl_msg_handlers[protocol] = NULL;
 296 }
 297 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 298
 299 static LIST_HEAD(link_ops);
 300
 301 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 302 {
 303         const struct rtnl_link_ops *ops;
 304
 305         list_for_each_entry(ops, &link_ops, list) {
 306                 if (!strcmp(ops->kind, kind))
 307                         return ops;
 308         }
 309         return NULL;
 310 }
 311
 312 /**
 313  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 314  * @ops: struct rtnl_link_ops * to register
 315  *
 316  * The caller must hold the rtnl_mutex. This function should be used
 317  * by drivers that create devices during module initialization. It
 318  * must be called before registering the devices.
 319  *
 320  * Returns 0 on success or a negative error code.
 321  */
 322 int __rtnl_link_register(struct rtnl_link_ops *ops)
 323 {
 324         if (rtnl_link_ops_get(ops->kind))
 325                 return -EEXIST;
 326
 327         /* The check for setup is here because if ops
 328          * does not have that filled up, it is not possible
 329          * to use the ops for creating device. So do not
 330          * fill up dellink as well. That disables rtnl_dellink.
 331          */
 332         if (ops->setup && !ops->dellink)
 333                 ops->dellink = unregister_netdevice_queue;
 334
 335         list_add_tail(&ops->list, &link_ops);
 336         return 0;
 337 }
 338 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 339
 340 /**
 341  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 342  * @ops: struct rtnl_link_ops * to register
 343  *
 344  * Returns 0 on success or a negative error code.
 345  */
 346 int rtnl_link_register(struct rtnl_link_ops *ops)
 347 {
 348         int err;
 349
 350         rtnl_lock();
 351         err = __rtnl_link_register(ops);
 352         rtnl_unlock();
 353         return err;
 354 }
 355 EXPORT_SYMBOL_GPL(rtnl_link_register);
 356
 357 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 358 {
 359         struct net_device *dev;
 360         LIST_HEAD(list_kill);
 361
 362         for_each_netdev(net, dev) {
 363                 if (dev->rtnl_link_ops == ops)
 364                         ops->dellink(dev, &list_kill);
 365         }
 366         unregister_netdevice_many(&list_kill);
 367 }
 368
 369 /**
 370  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 371  * @ops: struct rtnl_link_ops * to unregister
 372  *
 373  * The caller must hold the rtnl_mutex.
 374  */
 375 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 376 {
 377         struct net *net;
 378
 379         for_each_net(net) {
 380                 __rtnl_kill_links(net, ops);
 381         }
 382         list_del(&ops->list);
 383 }
 384 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 385
 386 /* Return with the rtnl_lock held when there are no network
 387  * devices unregistering in any network namespace.
 388  */
 389 static void rtnl_lock_unregistering_all(void)
 390 {
 391         struct net *net;
 392         bool unregistering;
 393         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 394
 395         add_wait_queue(&netdev_unregistering_wq, &wait);
 396         for (;;) {
 397                 unregistering = false;
 398                 rtnl_lock();
 399                 for_each_net(net) {
 400                         if (net->dev_unreg_count > 0) {
 401                                 unregistering = true;
 402                                 break;
 403                         }
 404                 }
 405                 if (!unregistering)
 406                         break;
 407                 __rtnl_unlock();
 408
 409                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 410         }
 411         remove_wait_queue(&netdev_unregistering_wq, &wait);
 412 }
 413
 414 /**
 415  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 416  * @ops: struct rtnl_link_ops * to unregister
 417  */
 418 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 419 {
 420         /* Close the race with cleanup_net() */
 421         mutex_lock(&net_mutex);
 422         rtnl_lock_unregistering_all();
 423         __rtnl_link_unregister(ops);
 424         rtnl_unlock();
 425         mutex_unlock(&net_mutex);
 426 }
 427 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 428
 429 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 430 {
 431         struct net_device *master_dev;
 432         const struct rtnl_link_ops *ops;
 433
 434         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 435         if (!master_dev)
 436                 return 0;
 437         ops = master_dev->rtnl_link_ops;
 438         if (!ops || !ops->get_slave_size)
 439                 return 0;
 440         /* IFLA_INFO_SLAVE_DATA + nested data */
 441         return nla_total_size(sizeof(struct nlattr)) +
 442                ops->get_slave_size(master_dev, dev);
 443 }
 444
 445 static size_t rtnl_link_get_size(const struct net_device *dev)
 446 {
 447         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 448         size_t size;
 449
 450         if (!ops)
 451                 return 0;
 452
 453         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 454                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 455
 456         if (ops->get_size)
 457                 /* IFLA_INFO_DATA + nested data */
 458                 size += nla_total_size(sizeof(struct nlattr)) +
 459                         ops->get_size(dev);
 460
 461         if (ops->get_xstats_size)
 462                 /* IFLA_INFO_XSTATS */
 463                 size += nla_total_size(ops->get_xstats_size(dev));
 464
 465         size += rtnl_link_get_slave_info_data_size(dev);
 466
 467         return size;
 468 }
 469
 470 static LIST_HEAD(rtnl_af_ops);
 471
 472 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 473 {
 474         const struct rtnl_af_ops *ops;
 475
 476         list_for_each_entry(ops, &rtnl_af_ops, list) {
 477                 if (ops->family == family)
 478                         return ops;
 479         }
 480
 481         return NULL;
 482 }
 483
 484 /**
 485  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 486  * @ops: struct rtnl_af_ops * to register
 487  *
 488  * Returns 0 on success or a negative error code.
 489  */
 490 void rtnl_af_register(struct rtnl_af_ops *ops)
 491 {
 492         rtnl_lock();
 493         list_add_tail(&ops->list, &rtnl_af_ops);
 494         rtnl_unlock();
 495 }
 496 EXPORT_SYMBOL_GPL(rtnl_af_register);
 497
 498 /**
 499  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 500  * @ops: struct rtnl_af_ops * to unregister
 501  *
 502  * The caller must hold the rtnl_mutex.
 503  */
 504 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 505 {
 506         list_del(&ops->list);
 507 }
 508 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 509
 510 /**
 511  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 512  * @ops: struct rtnl_af_ops * to unregister
 513  */
 514 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 515 {
 516         rtnl_lock();
 517         __rtnl_af_unregister(ops);
 518         rtnl_unlock();
 519 }
 520 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 521
 522 static size_t rtnl_link_get_af_size(const struct net_device *dev,
 523                                     u32 ext_filter_mask)
 524 {
 525         struct rtnl_af_ops *af_ops;
 526         size_t size;
 527
 528         /* IFLA_AF_SPEC */
 529         size = nla_total_size(sizeof(struct nlattr));
 530
 531         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 532                 if (af_ops->get_link_af_size) {
 533                         /* AF_* + nested data */
 534                         size += nla_total_size(sizeof(struct nlattr)) +
 535                                 af_ops->get_link_af_size(dev, ext_filter_mask);
 536                 }
 537         }
 538
 539         return size;
 540 }
 541
 542 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 543 {
 544         struct net_device *master_dev;
 545
 546         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 547         if (master_dev && master_dev->rtnl_link_ops)
 548                 return true;
 549         return false;
 550 }
 551
 552 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 553                                      const struct net_device *dev)
 554 {
 555         struct net_device *master_dev;
 556         const struct rtnl_link_ops *ops;
 557         struct nlattr *slave_data;
 558         int err;
 559
 560         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 561         if (!master_dev)
 562                 return 0;
 563         ops = master_dev->rtnl_link_ops;
 564         if (!ops)
 565                 return 0;
 566         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 567                 return -EMSGSIZE;
 568         if (ops->fill_slave_info) {
 569                 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
 570                 if (!slave_data)
 571                         return -EMSGSIZE;
 572                 err = ops->fill_slave_info(skb, master_dev, dev);
 573                 if (err < 0)
 574                         goto err_cancel_slave_data;
 575                 nla_nest_end(skb, slave_data);
 576         }
 577         return 0;
 578
 579 err_cancel_slave_data:
 580         nla_nest_cancel(skb, slave_data);
 581         return err;
 582 }
 583
 584 static int rtnl_link_info_fill(struct sk_buff *skb,
 585                                const struct net_device *dev)
 586 {
 587         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 588         struct nlattr *data;
 589         int err;
 590
 591         if (!ops)
 592                 return 0;
 593         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 594                 return -EMSGSIZE;
 595         if (ops->fill_xstats) {
 596                 err = ops->fill_xstats(skb, dev);
 597                 if (err < 0)
 598                         return err;
 599         }
 600         if (ops->fill_info) {
 601                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 602                 if (data == NULL)
 603                         return -EMSGSIZE;
 604                 err = ops->fill_info(skb, dev);
 605                 if (err < 0)
 606                         goto err_cancel_data;
 607                 nla_nest_end(skb, data);
 608         }
 609         return 0;
 610
 611 err_cancel_data:
 612         nla_nest_cancel(skb, data);
 613         return err;
 614 }
 615
 616 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 617 {
 618         struct nlattr *linkinfo;
 619         int err = -EMSGSIZE;
 620
 621         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 622         if (linkinfo == NULL)
 623                 goto out;
 624
 625         err = rtnl_link_info_fill(skb, dev);
 626         if (err < 0)
 627                 goto err_cancel_link;
 628
 629         err = rtnl_link_slave_info_fill(skb, dev);
 630         if (err < 0)
 631                 goto err_cancel_link;
 632
 633         nla_nest_end(skb, linkinfo);
 634         return 0;
 635
 636 err_cancel_link:
 637         nla_nest_cancel(skb, linkinfo);
 638 out:
 639         return err;
 640 }
 641
 642 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 643 {
 644         struct sock *rtnl = net->rtnl;
 645         int err = 0;
 646
 647         NETLINK_CB(skb).dst_group = group;
 648         if (echo)
 649                 atomic_inc(&skb->users);
 650         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 651         if (echo)
 652                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 653         return err;
 654 }
 655
 656 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 657 {
 658         struct sock *rtnl = net->rtnl;
 659
 660         return nlmsg_unicast(rtnl, skb, pid);
 661 }
 662 EXPORT_SYMBOL(rtnl_unicast);
 663
 664 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 665                  struct nlmsghdr *nlh, gfp_t flags)
 666 {
 667         struct sock *rtnl = net->rtnl;
 668         int report = 0;
 669
 670         if (nlh)
 671                 report = nlmsg_report(nlh);
 672
 673         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 674 }
 675 EXPORT_SYMBOL(rtnl_notify);
 676
 677 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 678 {
 679         struct sock *rtnl = net->rtnl;
 680
 681         netlink_set_err(rtnl, 0, group, error);
 682 }
 683 EXPORT_SYMBOL(rtnl_set_sk_err);
 684
 685 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 686 {
 687         struct nlattr *mx;
 688         int i, valid = 0;
 689
 690         mx = nla_nest_start(skb, RTA_METRICS);
 691         if (mx == NULL)
 692                 return -ENOBUFS;
 693
 694         for (i = 0; i < RTAX_MAX; i++) {
 695                 if (metrics[i]) {
 696                         if (i == RTAX_CC_ALGO - 1) {
 697                                 char tmp[TCP_CA_NAME_MAX], *name;
 698
 699                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 700                                 if (!name)
 701                                         continue;
 702                                 if (nla_put_string(skb, i + 1, name))
 703                                         goto nla_put_failure;
 704                         } else if (i == RTAX_FEATURES - 1) {
 705                                 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 706
 707                                 if (!user_features)
 708                                         continue;
 709                                 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 710                                 if (nla_put_u32(skb, i + 1, user_features))
 711                                         goto nla_put_failure;
 712                         } else {
 713                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 714                                         goto nla_put_failure;
 715                         }
 716                         valid++;
 717                 }
 718         }
 719
 720         if (!valid) {
 721                 nla_nest_cancel(skb, mx);
 722                 return 0;
 723         }
 724
 725         return nla_nest_end(skb, mx);
 726
 727 nla_put_failure:
 728         nla_nest_cancel(skb, mx);
 729         return -EMSGSIZE;
 730 }
 731 EXPORT_SYMBOL(rtnetlink_put_metrics);
 732
 733 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 734                        long expires, u32 error)
 735 {
 736         struct rta_cacheinfo ci = {
 737                 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
 738                 .rta_used = dst->__use,
 739                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 740                 .rta_error = error,
 741                 .rta_id =  id,
 742         };
 743
 744         if (expires) {
 745                 unsigned long clock;
 746
 747                 clock = jiffies_to_clock_t(abs(expires));
 748                 clock = min_t(unsigned long, clock, INT_MAX);
 749                 ci.rta_expires = (expires > 0) ? clock : -clock;
 750         }
 751         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 752 }
 753 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 754
 755 static void set_operstate(struct net_device *dev, unsigned char transition)
 756 {
 757         unsigned char operstate = dev->operstate;
 758
 759         switch (transition) {
 760         case IF_OPER_UP:
 761                 if ((operstate == IF_OPER_DORMANT ||
 762                      operstate == IF_OPER_UNKNOWN) &&
 763                     !netif_dormant(dev))
 764                         operstate = IF_OPER_UP;
 765                 break;
 766
 767         case IF_OPER_DORMANT:
 768                 if (operstate == IF_OPER_UP ||
 769                     operstate == IF_OPER_UNKNOWN)
 770                         operstate = IF_OPER_DORMANT;
 771                 break;
 772         }
 773
 774         if (dev->operstate != operstate) {
 775                 write_lock_bh(&dev_base_lock);
 776                 dev->operstate = operstate;
 777                 write_unlock_bh(&dev_base_lock);
 778                 netdev_state_change(dev);
 779         }
 780 }
 781
 782 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 783 {
 784         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 785                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 786 }
 787
 788 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 789                                            const struct ifinfomsg *ifm)
 790 {
 791         unsigned int flags = ifm->ifi_flags;
 792
 793         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 794         if (ifm->ifi_change)
 795                 flags = (flags & ifm->ifi_change) |
 796                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 797
 798         return flags;
 799 }
 800
 801 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 802                                  const struct rtnl_link_stats64 *b)
 803 {
 804         a->rx_packets = b->rx_packets;
 805         a->tx_packets = b->tx_packets;
 806         a->rx_bytes = b->rx_bytes;
 807         a->tx_bytes = b->tx_bytes;
 808         a->rx_errors = b->rx_errors;
 809         a->tx_errors = b->tx_errors;
 810         a->rx_dropped = b->rx_dropped;
 811         a->tx_dropped = b->tx_dropped;
 812
 813         a->multicast = b->multicast;
 814         a->collisions = b->collisions;
 815
 816         a->rx_length_errors = b->rx_length_errors;
 817         a->rx_over_errors = b->rx_over_errors;
 818         a->rx_crc_errors = b->rx_crc_errors;
 819         a->rx_frame_errors = b->rx_frame_errors;
 820         a->rx_fifo_errors = b->rx_fifo_errors;
 821         a->rx_missed_errors = b->rx_missed_errors;
 822
 823         a->tx_aborted_errors = b->tx_aborted_errors;
 824         a->tx_carrier_errors = b->tx_carrier_errors;
 825         a->tx_fifo_errors = b->tx_fifo_errors;
 826         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 827         a->tx_window_errors = b->tx_window_errors;
 828
 829         a->rx_compressed = b->rx_compressed;
 830         a->tx_compressed = b->tx_compressed;
 831
 832         a->rx_nohandler = b->rx_nohandler;
 833 }
 834
 835 /* All VF info */
 836 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 837                                    u32 ext_filter_mask)
 838 {
 839         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 840             (ext_filter_mask & RTEXT_FILTER_VF)) {
 841                 int num_vfs = dev_num_vf(dev->dev.parent);
 842                 size_t size = nla_total_size(sizeof(struct nlattr));
 843                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 844                 size += num_vfs *
 845                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 846                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 847                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 848                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 849                          nla_total_size(sizeof(struct ifla_vf_link_state)) +
 850                          nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 851                          /* IFLA_VF_STATS_RX_PACKETS */
 852                          nla_total_size_64bit(sizeof(__u64)) +
 853                          /* IFLA_VF_STATS_TX_PACKETS */
 854                          nla_total_size_64bit(sizeof(__u64)) +
 855                          /* IFLA_VF_STATS_RX_BYTES */
 856                          nla_total_size_64bit(sizeof(__u64)) +
 857                          /* IFLA_VF_STATS_TX_BYTES */
 858                          nla_total_size_64bit(sizeof(__u64)) +
 859                          /* IFLA_VF_STATS_BROADCAST */
 860                          nla_total_size_64bit(sizeof(__u64)) +
 861                          /* IFLA_VF_STATS_MULTICAST */
 862                          nla_total_size_64bit(sizeof(__u64)) +
 863                          nla_total_size(sizeof(struct ifla_vf_trust)));
 864                 return size;
 865         } else
 866                 return 0;
 867 }
 868
 869 static size_t rtnl_port_size(const struct net_device *dev,
 870                              u32 ext_filter_mask)
 871 {
 872         size_t port_size = nla_total_size(4)            /* PORT_VF */
 873                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 874                 + nla_total_size(sizeof(struct ifla_port_vsi))
 875                                                         /* PORT_VSI_TYPE */
 876                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 877                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 878                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 879                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 880         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 881         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 882                 + port_size;
 883         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 884                 + port_size;
 885
 886         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 887             !(ext_filter_mask & RTEXT_FILTER_VF))
 888                 return 0;
 889         if (dev_num_vf(dev->dev.parent))
 890                 return port_self_size + vf_ports_size +
 891                         vf_port_size * dev_num_vf(dev->dev.parent);
 892         else
 893                 return port_self_size;
 894 }
 895
 896 static size_t rtnl_xdp_size(const struct net_device *dev)
 897 {
 898         size_t xdp_size = nla_total_size(1);    /* XDP_ATTACHED */
 899
 900         if (!dev->netdev_ops->ndo_xdp)
 901                 return 0;
 902         else
 903                 return xdp_size;
 904 }
 905
 906 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 907                                      u32 ext_filter_mask)
 908 {
 909         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 910                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 911                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 912                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 913                + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
 914                + nla_total_size(sizeof(struct rtnl_link_stats))
 915                + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
 916                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 917                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 918                + nla_total_size(4) /* IFLA_TXQLEN */
 919                + nla_total_size(4) /* IFLA_WEIGHT */
 920                + nla_total_size(4) /* IFLA_MTU */
 921                + nla_total_size(4) /* IFLA_LINK */
 922                + nla_total_size(4) /* IFLA_MASTER */
 923                + nla_total_size(1) /* IFLA_CARRIER */
 924                + nla_total_size(4) /* IFLA_PROMISCUITY */
 925                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 926                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 927                + nla_total_size(4) /* IFLA_MAX_GSO_SEGS */
 928                + nla_total_size(4) /* IFLA_MAX_GSO_SIZE */
 929                + nla_total_size(1) /* IFLA_OPERSTATE */
 930                + nla_total_size(1) /* IFLA_LINKMODE */
 931                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
 932                + nla_total_size(4) /* IFLA_LINK_NETNSID */
 933                + nla_total_size(ext_filter_mask
 934                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 935                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 936                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 937                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 938                + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
 939                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
 940                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
 941                + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
 942                + rtnl_xdp_size(dev) /* IFLA_XDP */
 943                + nla_total_size(1); /* IFLA_PROTO_DOWN */
 944
 945 }
 946
 947 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 948 {
 949         struct nlattr *vf_ports;
 950         struct nlattr *vf_port;
 951         int vf;
 952         int err;
 953
 954         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 955         if (!vf_ports)
 956                 return -EMSGSIZE;
 957
 958         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 959                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 960                 if (!vf_port)
 961                         goto nla_put_failure;
 962                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 963                         goto nla_put_failure;
 964                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 965                 if (err == -EMSGSIZE)
 966                         goto nla_put_failure;
 967                 if (err) {
 968                         nla_nest_cancel(skb, vf_port);
 969                         continue;
 970                 }
 971                 nla_nest_end(skb, vf_port);
 972         }
 973
 974         nla_nest_end(skb, vf_ports);
 975
 976         return 0;
 977
 978 nla_put_failure:
 979         nla_nest_cancel(skb, vf_ports);
 980         return -EMSGSIZE;
 981 }
 982
 983 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 984 {
 985         struct nlattr *port_self;
 986         int err;
 987
 988         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 989         if (!port_self)
 990                 return -EMSGSIZE;
 991
 992         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 993         if (err) {
 994                 nla_nest_cancel(skb, port_self);
 995                 return (err == -EMSGSIZE) ? err : 0;
 996         }
 997
 998         nla_nest_end(skb, port_self);
 999
1000         return 0;
1001 }
1002
1003 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1004                           u32 ext_filter_mask)
1005 {
1006         int err;
1007
1008         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1009             !(ext_filter_mask & RTEXT_FILTER_VF))
1010                 return 0;
1011
1012         err = rtnl_port_self_fill(skb, dev);
1013         if (err)
1014                 return err;
1015
1016         if (dev_num_vf(dev->dev.parent)) {
1017                 err = rtnl_vf_ports_fill(skb, dev);
1018                 if (err)
1019                         return err;
1020         }
1021
1022         return 0;
1023 }
1024
1025 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1026 {
1027         int err;
1028         struct netdev_phys_item_id ppid;
1029
1030         err = dev_get_phys_port_id(dev, &ppid);
1031         if (err) {
1032                 if (err == -EOPNOTSUPP)
1033                         return 0;
1034                 return err;
1035         }
1036
1037         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1038                 return -EMSGSIZE;
1039
1040         return 0;
1041 }
1042
1043 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1044 {
1045         char name[IFNAMSIZ];
1046         int err;
1047
1048         err = dev_get_phys_port_name(dev, name, sizeof(name));
1049         if (err) {
1050                 if (err == -EOPNOTSUPP)
1051                         return 0;
1052                 return err;
1053         }
1054
1055         if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
1056                 return -EMSGSIZE;
1057
1058         return 0;
1059 }
1060
1061 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1062 {
1063         int err;
1064         struct switchdev_attr attr = {
1065                 .orig_dev = dev,
1066                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1067                 .flags = SWITCHDEV_F_NO_RECURSE,
1068         };
1069
1070         err = switchdev_port_attr_get(dev, &attr);
1071         if (err) {
1072                 if (err == -EOPNOTSUPP)
1073                         return 0;
1074                 return err;
1075         }
1076
1077         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1078                     attr.u.ppid.id))
1079                 return -EMSGSIZE;
1080
1081         return 0;
1082 }
1083
1084 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1085                                               struct net_device *dev)
1086 {
1087         struct rtnl_link_stats64 *sp;
1088         struct nlattr *attr;
1089
1090         attr = nla_reserve_64bit(skb, IFLA_STATS64,
1091                                  sizeof(struct rtnl_link_stats64), IFLA_PAD);
1092         if (!attr)
1093                 return -EMSGSIZE;
1094
1095         sp = nla_data(attr);
1096         dev_get_stats(dev, sp);
1097
1098         attr = nla_reserve(skb, IFLA_STATS,
1099                            sizeof(struct rtnl_link_stats));
1100         if (!attr)
1101                 return -EMSGSIZE;
1102
1103         copy_rtnl_link_stats(nla_data(attr), sp);
1104
1105         return 0;
1106 }
1107
1108 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1109                                                struct net_device *dev,
1110                                                int vfs_num,
1111                                                struct nlattr *vfinfo)
1112 {
1113         struct ifla_vf_rss_query_en vf_rss_query_en;
1114         struct ifla_vf_link_state vf_linkstate;
1115         struct ifla_vf_spoofchk vf_spoofchk;
1116         struct ifla_vf_tx_rate vf_tx_rate;
1117         struct ifla_vf_stats vf_stats;
1118         struct ifla_vf_trust vf_trust;
1119         struct ifla_vf_vlan vf_vlan;
1120         struct ifla_vf_rate vf_rate;
1121         struct nlattr *vf, *vfstats;
1122         struct ifla_vf_mac vf_mac;
1123         struct ifla_vf_info ivi;
1124
1125         /* Not all SR-IOV capable drivers support the
1126          * spoofcheck and "RSS query enable" query.  Preset to
1127          * -1 so the user space tool can detect that the driver
1128          * didn't report anything.
1129          */
1130         ivi.spoofchk = -1;
1131         ivi.rss_query_en = -1;
1132         ivi.trusted = -1;
1133         memset(ivi.mac, 0, sizeof(ivi.mac));
1134         /* The default value for VF link state is "auto"
1135          * IFLA_VF_LINK_STATE_AUTO which equals zero
1136          */
1137         ivi.linkstate = 0;
1138         if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1139                 return 0;
1140
1141         vf_mac.vf =
1142                 vf_vlan.vf =
1143                 vf_rate.vf =
1144                 vf_tx_rate.vf =
1145                 vf_spoofchk.vf =
1146                 vf_linkstate.vf =
1147                 vf_rss_query_en.vf =
1148                 vf_trust.vf = ivi.vf;
1149
1150         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1151         vf_vlan.vlan = ivi.vlan;
1152         vf_vlan.qos = ivi.qos;
1153         vf_tx_rate.rate = ivi.max_tx_rate;
1154         vf_rate.min_tx_rate = ivi.min_tx_rate;
1155         vf_rate.max_tx_rate = ivi.max_tx_rate;
1156         vf_spoofchk.setting = ivi.spoofchk;
1157         vf_linkstate.link_state = ivi.linkstate;
1158         vf_rss_query_en.setting = ivi.rss_query_en;
1159         vf_trust.setting = ivi.trusted;
1160         vf = nla_nest_start(skb, IFLA_VF_INFO);
1161         if (!vf) {
1162                 nla_nest_cancel(skb, vfinfo);
1163                 return -EMSGSIZE;
1164         }
1165         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1166             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1167             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1168                     &vf_rate) ||
1169             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1170                     &vf_tx_rate) ||
1171             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1172                     &vf_spoofchk) ||
1173             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1174                     &vf_linkstate) ||
1175             nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1176                     sizeof(vf_rss_query_en),
1177                     &vf_rss_query_en) ||
1178             nla_put(skb, IFLA_VF_TRUST,
1179                     sizeof(vf_trust), &vf_trust))
1180                 return -EMSGSIZE;
1181         memset(&vf_stats, 0, sizeof(vf_stats));
1182         if (dev->netdev_ops->ndo_get_vf_stats)
1183                 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1184                                                 &vf_stats);
1185         vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1186         if (!vfstats) {
1187                 nla_nest_cancel(skb, vf);
1188                 nla_nest_cancel(skb, vfinfo);
1189                 return -EMSGSIZE;
1190         }
1191         if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1192                               vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1193             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1194                               vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1195             nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1196                               vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1197             nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1198                               vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1199             nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1200                               vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1201             nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1202                               vf_stats.multicast, IFLA_VF_STATS_PAD))
1203                 return -EMSGSIZE;
1204         nla_nest_end(skb, vfstats);
1205         nla_nest_end(skb, vf);
1206         return 0;
1207 }
1208
1209 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1210 {
1211         struct rtnl_link_ifmap map;
1212
1213         memset(&map, 0, sizeof(map));
1214         map.mem_start   = dev->mem_start;
1215         map.mem_end     = dev->mem_end;
1216         map.base_addr   = dev->base_addr;
1217         map.irq         = dev->irq;
1218         map.dma         = dev->dma;
1219         map.port        = dev->if_port;
1220
1221         if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1222                 return -EMSGSIZE;
1223
1224         return 0;
1225 }
1226
1227 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1228 {
1229         struct netdev_xdp xdp_op = {};
1230         struct nlattr *xdp;
1231         int err;
1232
1233         if (!dev->netdev_ops->ndo_xdp)
1234                 return 0;
1235         xdp = nla_nest_start(skb, IFLA_XDP);
1236         if (!xdp)
1237                 return -EMSGSIZE;
1238         xdp_op.command = XDP_QUERY_PROG;
1239         err = dev->netdev_ops->ndo_xdp(dev, &xdp_op);
1240         if (err)
1241                 goto err_cancel;
1242         err = nla_put_u8(skb, IFLA_XDP_ATTACHED, xdp_op.prog_attached);
1243         if (err)
1244                 goto err_cancel;
1245
1246         nla_nest_end(skb, xdp);
1247         return 0;
1248
1249 err_cancel:
1250         nla_nest_cancel(skb, xdp);
1251         return err;
1252 }
1253
1254 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1255                             int type, u32 pid, u32 seq, u32 change,
1256                             unsigned int flags, u32 ext_filter_mask)
1257 {
1258         struct ifinfomsg *ifm;
1259         struct nlmsghdr *nlh;
1260         struct nlattr *af_spec;
1261         struct rtnl_af_ops *af_ops;
1262         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1263
1264         ASSERT_RTNL();
1265         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1266         if (nlh == NULL)
1267                 return -EMSGSIZE;
1268
1269         ifm = nlmsg_data(nlh);
1270         ifm->ifi_family = AF_UNSPEC;
1271         ifm->__ifi_pad = 0;
1272         ifm->ifi_type = dev->type;
1273         ifm->ifi_index = dev->ifindex;
1274         ifm->ifi_flags = dev_get_flags(dev);
1275         ifm->ifi_change = change;
1276
1277         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1278             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1279             nla_put_u8(skb, IFLA_OPERSTATE,
1280                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1281             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1282             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1283             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1284             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1285             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1286             nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1287             nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1288 #ifdef CONFIG_RPS
1289             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1290 #endif
1291             (dev->ifindex != dev_get_iflink(dev) &&
1292              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1293             (upper_dev &&
1294              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1295             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1296             (dev->qdisc &&
1297              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1298             (dev->ifalias &&
1299              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1300             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1301                         atomic_read(&dev->carrier_changes)) ||
1302             nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1303                 goto nla_put_failure;
1304
1305         if (rtnl_fill_link_ifmap(skb, dev))
1306                 goto nla_put_failure;
1307
1308         if (dev->addr_len) {
1309                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1310                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1311                         goto nla_put_failure;
1312         }
1313
1314         if (rtnl_phys_port_id_fill(skb, dev))
1315                 goto nla_put_failure;
1316
1317         if (rtnl_phys_port_name_fill(skb, dev))
1318                 goto nla_put_failure;
1319
1320         if (rtnl_phys_switch_id_fill(skb, dev))
1321                 goto nla_put_failure;
1322
1323         if (rtnl_fill_stats(skb, dev))
1324                 goto nla_put_failure;
1325
1326         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1327             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1328                 goto nla_put_failure;
1329
1330         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent &&
1331             ext_filter_mask & RTEXT_FILTER_VF) {
1332                 int i;
1333                 struct nlattr *vfinfo;
1334                 int num_vfs = dev_num_vf(dev->dev.parent);
1335
1336                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1337                 if (!vfinfo)
1338                         goto nla_put_failure;
1339                 for (i = 0; i < num_vfs; i++) {
1340                         if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1341                                 goto nla_put_failure;
1342                 }
1343
1344                 nla_nest_end(skb, vfinfo);
1345         }
1346
1347         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1348                 goto nla_put_failure;
1349
1350         if (rtnl_xdp_fill(skb, dev))
1351                 goto nla_put_failure;
1352
1353         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1354                 if (rtnl_link_fill(skb, dev) < 0)
1355                         goto nla_put_failure;
1356         }
1357
1358         if (dev->rtnl_link_ops &&
1359             dev->rtnl_link_ops->get_link_net) {
1360                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1361
1362                 if (!net_eq(dev_net(dev), link_net)) {
1363                         int id = peernet2id_alloc(dev_net(dev), link_net);
1364
1365                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1366                                 goto nla_put_failure;
1367                 }
1368         }
1369
1370         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1371                 goto nla_put_failure;
1372
1373         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1374                 if (af_ops->fill_link_af) {
1375                         struct nlattr *af;
1376                         int err;
1377
1378                         if (!(af = nla_nest_start(skb, af_ops->family)))
1379                                 goto nla_put_failure;
1380
1381                         err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1382
1383                         /*
1384                          * Caller may return ENODATA to indicate that there
1385                          * was no data to be dumped. This is not an error, it
1386                          * means we should trim the attribute header and
1387                          * continue.
1388                          */
1389                         if (err == -ENODATA)
1390                                 nla_nest_cancel(skb, af);
1391                         else if (err < 0)
1392                                 goto nla_put_failure;
1393
1394                         nla_nest_end(skb, af);
1395                 }
1396         }
1397
1398         nla_nest_end(skb, af_spec);
1399
1400         nlmsg_end(skb, nlh);
1401         return 0;
1402
1403 nla_put_failure:
1404         nlmsg_cancel(skb, nlh);
1405         return -EMSGSIZE;
1406 }
1407
1408 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1409         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1410         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1411         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1412         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1413         [IFLA_MTU]              = { .type = NLA_U32 },
1414         [IFLA_LINK]             = { .type = NLA_U32 },
1415         [IFLA_MASTER]           = { .type = NLA_U32 },
1416         [IFLA_CARRIER]          = { .type = NLA_U8 },
1417         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1418         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1419         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1420         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1421         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1422         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1423         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1424         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1425         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1426         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1427         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1428         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1429         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1430         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1431         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1432         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1433         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1434         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1435         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1436         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1437         [IFLA_PROTO_DOWN]       = { .type = NLA_U8 },
1438         [IFLA_XDP]              = { .type = NLA_NESTED },
1439 };
1440
1441 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1442         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1443         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1444         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1445         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1446 };
1447
1448 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1449         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1450         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1451         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1452         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1453         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1454         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1455         [IFLA_VF_RSS_QUERY_EN]  = { .len = sizeof(struct ifla_vf_rss_query_en) },
1456         [IFLA_VF_STATS]         = { .type = NLA_NESTED },
1457         [IFLA_VF_TRUST]         = { .len = sizeof(struct ifla_vf_trust) },
1458         [IFLA_VF_IB_NODE_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1459         [IFLA_VF_IB_PORT_GUID]  = { .len = sizeof(struct ifla_vf_guid) },
1460 };
1461
1462 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1463         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1464         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1465                                     .len = PORT_PROFILE_MAX },
1466         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1467                                     .len = sizeof(struct ifla_port_vsi)},
1468         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1469                                       .len = PORT_UUID_MAX },
1470         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1471                                     .len = PORT_UUID_MAX },
1472         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1473         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1474 };
1475
1476 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1477         [IFLA_XDP_FD]           = { .type = NLA_S32 },
1478         [IFLA_XDP_ATTACHED]     = { .type = NLA_U8 },
1479 };
1480
1481 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1482 {
1483         const struct rtnl_link_ops *ops = NULL;
1484         struct nlattr *linfo[IFLA_INFO_MAX + 1];
1485
1486         if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0)
1487                 return NULL;
1488
1489         if (linfo[IFLA_INFO_KIND]) {
1490                 char kind[MODULE_NAME_LEN];
1491
1492                 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1493                 ops = rtnl_link_ops_get(kind);
1494         }
1495
1496         return ops;
1497 }
1498
1499 static bool link_master_filtered(struct net_device *dev, int master_idx)
1500 {
1501         struct net_device *master;
1502
1503         if (!master_idx)
1504                 return false;
1505
1506         master = netdev_master_upper_dev_get(dev);
1507         if (!master || master->ifindex != master_idx)
1508                 return true;
1509
1510         return false;
1511 }
1512
1513 static bool link_kind_filtered(const struct net_device *dev,
1514                                const struct rtnl_link_ops *kind_ops)
1515 {
1516         if (kind_ops && dev->rtnl_link_ops != kind_ops)
1517                 return true;
1518
1519         return false;
1520 }
1521
1522 static bool link_dump_filtered(struct net_device *dev,
1523                                int master_idx,
1524                                const struct rtnl_link_ops *kind_ops)
1525 {
1526         if (link_master_filtered(dev, master_idx) ||
1527             link_kind_filtered(dev, kind_ops))
1528                 return true;
1529
1530         return false;
1531 }
1532
1533 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1534 {
1535         struct net *net = sock_net(skb->sk);
1536         int h, s_h;
1537         int idx = 0, s_idx;
1538         struct net_device *dev;
1539         struct hlist_head *head;
1540         struct nlattr *tb[IFLA_MAX+1];
1541         u32 ext_filter_mask = 0;
1542         const struct rtnl_link_ops *kind_ops = NULL;
1543         unsigned int flags = NLM_F_MULTI;
1544         int master_idx = 0;
1545         int err;
1546         int hdrlen;
1547
1548         s_h = cb->args[0];
1549         s_idx = cb->args[1];
1550
1551         cb->seq = net->dev_base_seq;
1552
1553         /* A hack to preserve kernel<->userspace interface.
1554          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1555          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1556          * what iproute2 < v3.9.0 used.
1557          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1558          * attribute, its netlink message is shorter than struct ifinfomsg.
1559          */
1560         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1561                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1562
1563         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1564
1565                 if (tb[IFLA_EXT_MASK])
1566                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1567
1568                 if (tb[IFLA_MASTER])
1569                         master_idx = nla_get_u32(tb[IFLA_MASTER]);
1570
1571                 if (tb[IFLA_LINKINFO])
1572                         kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1573
1574                 if (master_idx || kind_ops)
1575                         flags |= NLM_F_DUMP_FILTERED;
1576         }
1577
1578         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1579                 idx = 0;
1580                 head = &net->dev_index_head[h];
1581                 hlist_for_each_entry(dev, head, index_hlist) {
1582                         if (link_dump_filtered(dev, master_idx, kind_ops))
1583                                 continue;
1584                         if (idx < s_idx)
1585                                 goto cont;
1586                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1587                                                NETLINK_CB(cb->skb).portid,
1588                                                cb->nlh->nlmsg_seq, 0,
1589                                                flags,
1590                                                ext_filter_mask);
1591                         /* If we ran out of room on the first message,
1592                          * we're in trouble
1593                          */
1594                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1595
1596                         if (err < 0)
1597                                 goto out;
1598
1599                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1600 cont:
1601                         idx++;
1602                 }
1603         }
1604 out:
1605         cb->args[1] = idx;
1606         cb->args[0] = h;
1607
1608         return skb->len;
1609 }
1610
1611 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1612 {
1613         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1614 }
1615 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1616
1617 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1618 {
1619         struct net *net;
1620         /* Examine the link attributes and figure out which
1621          * network namespace we are talking about.
1622          */
1623         if (tb[IFLA_NET_NS_PID])
1624                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1625         else if (tb[IFLA_NET_NS_FD])
1626                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1627         else
1628                 net = get_net(src_net);
1629         return net;
1630 }
1631 EXPORT_SYMBOL(rtnl_link_get_net);
1632
1633 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1634 {
1635         if (dev) {
1636                 if (tb[IFLA_ADDRESS] &&
1637                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1638                         return -EINVAL;
1639
1640                 if (tb[IFLA_BROADCAST] &&
1641                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1642                         return -EINVAL;
1643         }
1644
1645         if (tb[IFLA_AF_SPEC]) {
1646                 struct nlattr *af;
1647                 int rem, err;
1648
1649                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1650                         const struct rtnl_af_ops *af_ops;
1651
1652                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1653                                 return -EAFNOSUPPORT;
1654
1655                         if (!af_ops->set_link_af)
1656                                 return -EOPNOTSUPP;
1657
1658                         if (af_ops->validate_link_af) {
1659                                 err = af_ops->validate_link_af(dev, af);
1660                                 if (err < 0)
1661                                         return err;
1662                         }
1663                 }
1664         }
1665
1666         return 0;
1667 }
1668
1669 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
1670                                   int guid_type)
1671 {
1672         const struct net_device_ops *ops = dev->netdev_ops;
1673
1674         return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
1675 }
1676
1677 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
1678 {
1679         if (dev->type != ARPHRD_INFINIBAND)
1680                 return -EOPNOTSUPP;
1681
1682         return handle_infiniband_guid(dev, ivt, guid_type);
1683 }
1684
1685 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1686 {
1687         const struct net_device_ops *ops = dev->netdev_ops;
1688         int err = -EINVAL;
1689
1690         if (tb[IFLA_VF_MAC]) {
1691                 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1692
1693                 err = -EOPNOTSUPP;
1694                 if (ops->ndo_set_vf_mac)
1695                         err = ops->ndo_set_vf_mac(dev, ivm->vf,
1696                                                   ivm->mac);
1697                 if (err < 0)
1698                         return err;
1699         }
1700
1701         if (tb[IFLA_VF_VLAN]) {
1702                 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1703
1704                 err = -EOPNOTSUPP;
1705                 if (ops->ndo_set_vf_vlan)
1706                         err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1707                                                    ivv->qos);
1708                 if (err < 0)
1709                         return err;
1710         }
1711
1712         if (tb[IFLA_VF_TX_RATE]) {
1713                 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1714                 struct ifla_vf_info ivf;
1715
1716                 err = -EOPNOTSUPP;
1717                 if (ops->ndo_get_vf_config)
1718                         err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1719                 if (err < 0)
1720                         return err;
1721
1722                 err = -EOPNOTSUPP;
1723                 if (ops->ndo_set_vf_rate)
1724                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1725                                                    ivf.min_tx_rate,
1726                                                    ivt->rate);
1727                 if (err < 0)
1728                         return err;
1729         }
1730
1731         if (tb[IFLA_VF_RATE]) {
1732                 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1733
1734                 err = -EOPNOTSUPP;
1735                 if (ops->ndo_set_vf_rate)
1736                         err = ops->ndo_set_vf_rate(dev, ivt->vf,
1737                                                    ivt->min_tx_rate,
1738                                                    ivt->max_tx_rate);
1739                 if (err < 0)
1740                         return err;
1741         }
1742
1743         if (tb[IFLA_VF_SPOOFCHK]) {
1744                 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1745
1746                 err = -EOPNOTSUPP;
1747                 if (ops->ndo_set_vf_spoofchk)
1748                         err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1749                                                        ivs->setting);
1750                 if (err < 0)
1751                         return err;
1752         }
1753
1754         if (tb[IFLA_VF_LINK_STATE]) {
1755                 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1756
1757                 err = -EOPNOTSUPP;
1758                 if (ops->ndo_set_vf_link_state)
1759                         err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1760                                                          ivl->link_state);
1761                 if (err < 0)
1762                         return err;
1763         }
1764
1765         if (tb[IFLA_VF_RSS_QUERY_EN]) {
1766                 struct ifla_vf_rss_query_en *ivrssq_en;
1767
1768                 err = -EOPNOTSUPP;
1769                 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1770                 if (ops->ndo_set_vf_rss_query_en)
1771                         err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1772                                                            ivrssq_en->setting);
1773                 if (err < 0)
1774                         return err;
1775         }
1776
1777         if (tb[IFLA_VF_TRUST]) {
1778                 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1779
1780                 err = -EOPNOTSUPP;
1781                 if (ops->ndo_set_vf_trust)
1782                         err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1783                 if (err < 0)
1784                         return err;
1785         }
1786
1787         if (tb[IFLA_VF_IB_NODE_GUID]) {
1788                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
1789
1790                 if (!ops->ndo_set_vf_guid)
1791                         return -EOPNOTSUPP;
1792
1793                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
1794         }
1795
1796         if (tb[IFLA_VF_IB_PORT_GUID]) {
1797                 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
1798
1799                 if (!ops->ndo_set_vf_guid)
1800                         return -EOPNOTSUPP;
1801
1802                 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
1803         }
1804
1805         return err;
1806 }
1807
1808 static int do_set_master(struct net_device *dev, int ifindex)
1809 {
1810         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1811         const struct net_device_ops *ops;
1812         int err;
1813
1814         if (upper_dev) {
1815                 if (upper_dev->ifindex == ifindex)
1816                         return 0;
1817                 ops = upper_dev->netdev_ops;
1818                 if (ops->ndo_del_slave) {
1819                         err = ops->ndo_del_slave(upper_dev, dev);
1820                         if (err)
1821                                 return err;
1822                 } else {
1823                         return -EOPNOTSUPP;
1824                 }
1825         }
1826
1827         if (ifindex) {
1828                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1829                 if (!upper_dev)
1830                         return -EINVAL;
1831                 ops = upper_dev->netdev_ops;
1832                 if (ops->ndo_add_slave) {
1833                         err = ops->ndo_add_slave(upper_dev, dev);
1834                         if (err)
1835                                 return err;
1836                 } else {
1837                         return -EOPNOTSUPP;
1838                 }
1839         }
1840         return 0;
1841 }
1842
1843 #define DO_SETLINK_MODIFIED     0x01
1844 /* notify flag means notify + modified. */
1845 #define DO_SETLINK_NOTIFY       0x03
1846 static int do_setlink(const struct sk_buff *skb,
1847                       struct net_device *dev, struct ifinfomsg *ifm,
1848                       struct nlattr **tb, char *ifname, int status)
1849 {
1850         const struct net_device_ops *ops = dev->netdev_ops;
1851         int err;
1852
1853         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1854                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1855                 if (IS_ERR(net)) {
1856                         err = PTR_ERR(net);
1857                         goto errout;
1858                 }
1859                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1860                         put_net(net);
1861                         err = -EPERM;
1862                         goto errout;
1863                 }
1864                 err = dev_change_net_namespace(dev, net, ifname);
1865                 put_net(net);
1866                 if (err)
1867                         goto errout;
1868                 status |= DO_SETLINK_MODIFIED;
1869         }
1870
1871         if (tb[IFLA_MAP]) {
1872                 struct rtnl_link_ifmap *u_map;
1873                 struct ifmap k_map;
1874
1875                 if (!ops->ndo_set_config) {
1876                         err = -EOPNOTSUPP;
1877                         goto errout;
1878                 }
1879
1880                 if (!netif_device_present(dev)) {
1881                         err = -ENODEV;
1882                         goto errout;
1883                 }
1884
1885                 u_map = nla_data(tb[IFLA_MAP]);
1886                 k_map.mem_start = (unsigned long) u_map->mem_start;
1887                 k_map.mem_end = (unsigned long) u_map->mem_end;
1888                 k_map.base_addr = (unsigned short) u_map->base_addr;
1889                 k_map.irq = (unsigned char) u_map->irq;
1890                 k_map.dma = (unsigned char) u_map->dma;
1891                 k_map.port = (unsigned char) u_map->port;
1892
1893                 err = ops->ndo_set_config(dev, &k_map);
1894                 if (err < 0)
1895                         goto errout;
1896
1897                 status |= DO_SETLINK_NOTIFY;
1898         }
1899
1900         if (tb[IFLA_ADDRESS]) {
1901                 struct sockaddr *sa;
1902                 int len;
1903
1904                 len = sizeof(sa_family_t) + dev->addr_len;
1905                 sa = kmalloc(len, GFP_KERNEL);
1906                 if (!sa) {
1907                         err = -ENOMEM;
1908                         goto errout;
1909                 }
1910                 sa->sa_family = dev->type;
1911                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1912                        dev->addr_len);
1913                 err = dev_set_mac_address(dev, sa);
1914                 kfree(sa);
1915                 if (err)
1916                         goto errout;
1917                 status |= DO_SETLINK_MODIFIED;
1918         }
1919
1920         if (tb[IFLA_MTU]) {
1921                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1922                 if (err < 0)
1923                         goto errout;
1924                 status |= DO_SETLINK_MODIFIED;
1925         }
1926
1927         if (tb[IFLA_GROUP]) {
1928                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1929                 status |= DO_SETLINK_NOTIFY;
1930         }
1931
1932         /*
1933          * Interface selected by interface index but interface
1934          * name provided implies that a name change has been
1935          * requested.
1936          */
1937         if (ifm->ifi_index > 0 && ifname[0]) {
1938                 err = dev_change_name(dev, ifname);
1939                 if (err < 0)
1940                         goto errout;
1941                 status |= DO_SETLINK_MODIFIED;
1942         }
1943
1944         if (tb[IFLA_IFALIAS]) {
1945                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1946                                     nla_len(tb[IFLA_IFALIAS]));
1947                 if (err < 0)
1948                         goto errout;
1949                 status |= DO_SETLINK_NOTIFY;
1950         }
1951
1952         if (tb[IFLA_BROADCAST]) {
1953                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1954                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1955         }
1956
1957         if (ifm->ifi_flags || ifm->ifi_change) {
1958                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1959                 if (err < 0)
1960                         goto errout;
1961         }
1962
1963         if (tb[IFLA_MASTER]) {
1964                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1965                 if (err)
1966                         goto errout;
1967                 status |= DO_SETLINK_MODIFIED;
1968         }
1969
1970         if (tb[IFLA_CARRIER]) {
1971                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1972                 if (err)
1973                         goto errout;
1974                 status |= DO_SETLINK_MODIFIED;
1975         }
1976
1977         if (tb[IFLA_TXQLEN]) {
1978                 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1979                 unsigned long orig_len = dev->tx_queue_len;
1980
1981                 if (dev->tx_queue_len ^ value) {
1982                         dev->tx_queue_len = value;
1983                         err = call_netdevice_notifiers(
1984                               NETDEV_CHANGE_TX_QUEUE_LEN, dev);
1985                         err = notifier_to_errno(err);
1986                         if (err) {
1987                                 dev->tx_queue_len = orig_len;
1988                                 goto errout;
1989                         }
1990                         status |= DO_SETLINK_NOTIFY;
1991                 }
1992         }
1993
1994         if (tb[IFLA_OPERSTATE])
1995                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1996
1997         if (tb[IFLA_LINKMODE]) {
1998                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1999
2000                 write_lock_bh(&dev_base_lock);
2001                 if (dev->link_mode ^ value)
2002                         status |= DO_SETLINK_NOTIFY;
2003                 dev->link_mode = value;
2004                 write_unlock_bh(&dev_base_lock);
2005         }
2006
2007         if (tb[IFLA_VFINFO_LIST]) {
2008                 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2009                 struct nlattr *attr;
2010                 int rem;
2011
2012                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2013                         if (nla_type(attr) != IFLA_VF_INFO ||
2014                             nla_len(attr) < NLA_HDRLEN) {
2015                                 err = -EINVAL;
2016                                 goto errout;
2017                         }
2018                         err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2019                                                ifla_vf_policy);
2020                         if (err < 0)
2021                                 goto errout;
2022                         err = do_setvfinfo(dev, vfinfo);
2023                         if (err < 0)
2024                                 goto errout;
2025                         status |= DO_SETLINK_NOTIFY;
2026                 }
2027         }
2028         err = 0;
2029
2030         if (tb[IFLA_VF_PORTS]) {
2031                 struct nlattr *port[IFLA_PORT_MAX+1];
2032                 struct nlattr *attr;
2033                 int vf;
2034                 int rem;
2035
2036                 err = -EOPNOTSUPP;
2037                 if (!ops->ndo_set_vf_port)
2038                         goto errout;
2039
2040                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2041                         if (nla_type(attr) != IFLA_VF_PORT ||
2042                             nla_len(attr) < NLA_HDRLEN) {
2043                                 err = -EINVAL;
2044                                 goto errout;
2045                         }
2046                         err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2047                                                ifla_port_policy);
2048                         if (err < 0)
2049                                 goto errout;
2050                         if (!port[IFLA_PORT_VF]) {
2051                                 err = -EOPNOTSUPP;
2052                                 goto errout;
2053                         }
2054                         vf = nla_get_u32(port[IFLA_PORT_VF]);
2055                         err = ops->ndo_set_vf_port(dev, vf, port);
2056                         if (err < 0)
2057                                 goto errout;
2058                         status |= DO_SETLINK_NOTIFY;
2059                 }
2060         }
2061         err = 0;
2062
2063         if (tb[IFLA_PORT_SELF]) {
2064                 struct nlattr *port[IFLA_PORT_MAX+1];
2065
2066                 err = nla_parse_nested(port, IFLA_PORT_MAX,
2067                         tb[IFLA_PORT_SELF], ifla_port_policy);
2068                 if (err < 0)
2069                         goto errout;
2070
2071                 err = -EOPNOTSUPP;
2072                 if (ops->ndo_set_vf_port)
2073                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2074                 if (err < 0)
2075                         goto errout;
2076                 status |= DO_SETLINK_NOTIFY;
2077         }
2078
2079         if (tb[IFLA_AF_SPEC]) {
2080                 struct nlattr *af;
2081                 int rem;
2082
2083                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2084                         const struct rtnl_af_ops *af_ops;
2085
2086                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
2087                                 BUG();
2088
2089                         err = af_ops->set_link_af(dev, af);
2090                         if (err < 0)
2091                                 goto errout;
2092
2093                         status |= DO_SETLINK_NOTIFY;
2094                 }
2095         }
2096         err = 0;
2097
2098         if (tb[IFLA_PROTO_DOWN]) {
2099                 err = dev_change_proto_down(dev,
2100                                             nla_get_u8(tb[IFLA_PROTO_DOWN]));
2101                 if (err)
2102                         goto errout;
2103                 status |= DO_SETLINK_NOTIFY;
2104         }
2105
2106         if (tb[IFLA_XDP]) {
2107                 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2108
2109                 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2110                                        ifla_xdp_policy);
2111                 if (err < 0)
2112                         goto errout;
2113
2114                 if (xdp[IFLA_XDP_ATTACHED]) {
2115                         err = -EINVAL;
2116                         goto errout;
2117                 }
2118                 if (xdp[IFLA_XDP_FD]) {
2119                         err = dev_change_xdp_fd(dev,
2120                                                 nla_get_s32(xdp[IFLA_XDP_FD]));
2121                         if (err)
2122                                 goto errout;
2123                         status |= DO_SETLINK_NOTIFY;
2124                 }
2125         }
2126
2127 errout:
2128         if (status & DO_SETLINK_MODIFIED) {
2129                 if (status & DO_SETLINK_NOTIFY)
2130                         netdev_state_change(dev);
2131
2132                 if (err < 0)
2133                         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",
2134                                              dev->name);
2135         }
2136
2137         return err;
2138 }
2139
2140 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2141 {
2142         struct net *net = sock_net(skb->sk);
2143         struct ifinfomsg *ifm;
2144         struct net_device *dev;
2145         int err;
2146         struct nlattr *tb[IFLA_MAX+1];
2147         char ifname[IFNAMSIZ];
2148
2149         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2150         if (err < 0)
2151                 goto errout;
2152
2153         if (tb[IFLA_IFNAME])
2154                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2155         else
2156                 ifname[0] = '\0';
2157
2158         err = -EINVAL;
2159         ifm = nlmsg_data(nlh);
2160         if (ifm->ifi_index > 0)
2161                 dev = __dev_get_by_index(net, ifm->ifi_index);
2162         else if (tb[IFLA_IFNAME])
2163                 dev = __dev_get_by_name(net, ifname);
2164         else
2165                 goto errout;
2166
2167         if (dev == NULL) {
2168                 err = -ENODEV;
2169                 goto errout;
2170         }
2171
2172         err = validate_linkmsg(dev, tb);
2173         if (err < 0)
2174                 goto errout;
2175
2176         err = do_setlink(skb, dev, ifm, tb, ifname, 0);
2177 errout:
2178         return err;
2179 }
2180
2181 static int rtnl_group_dellink(const struct net *net, int group)
2182 {
2183         struct net_device *dev, *aux;
2184         LIST_HEAD(list_kill);
2185         bool found = false;
2186
2187         if (!group)
2188                 return -EPERM;
2189
2190         for_each_netdev(net, dev) {
2191                 if (dev->group == group) {
2192                         const struct rtnl_link_ops *ops;
2193
2194                         found = true;
2195                         ops = dev->rtnl_link_ops;
2196                         if (!ops || !ops->dellink)
2197                                 return -EOPNOTSUPP;
2198                 }
2199         }
2200
2201         if (!found)
2202                 return -ENODEV;
2203
2204         for_each_netdev_safe(net, dev, aux) {
2205                 if (dev->group == group) {
2206                         const struct rtnl_link_ops *ops;
2207
2208                         ops = dev->rtnl_link_ops;
2209                         ops->dellink(dev, &list_kill);
2210                 }
2211         }
2212         unregister_netdevice_many(&list_kill);
2213
2214         return 0;
2215 }
2216
2217 int rtnl_delete_link(struct net_device *dev)
2218 {
2219         const struct rtnl_link_ops *ops;
2220         LIST_HEAD(list_kill);
2221
2222         ops = dev->rtnl_link_ops;
2223         if (!ops || !ops->dellink)
2224                 return -EOPNOTSUPP;
2225
2226         ops->dellink(dev, &list_kill);
2227         unregister_netdevice_many(&list_kill);
2228
2229         return 0;
2230 }
2231 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2232
2233 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2234 {
2235         struct net *net = sock_net(skb->sk);
2236         struct net_device *dev;
2237         struct ifinfomsg *ifm;
2238         char ifname[IFNAMSIZ];
2239         struct nlattr *tb[IFLA_MAX+1];
2240         int err;
2241
2242         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2243         if (err < 0)
2244                 return err;
2245
2246         if (tb[IFLA_IFNAME])
2247                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2248
2249         ifm = nlmsg_data(nlh);
2250         if (ifm->ifi_index > 0)
2251                 dev = __dev_get_by_index(net, ifm->ifi_index);
2252         else if (tb[IFLA_IFNAME])
2253                 dev = __dev_get_by_name(net, ifname);
2254         else if (tb[IFLA_GROUP])
2255                 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2256         else
2257                 return -EINVAL;
2258
2259         if (!dev)
2260                 return -ENODEV;
2261
2262         return rtnl_delete_link(dev);
2263 }
2264
2265 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2266 {
2267         unsigned int old_flags;
2268         int err;
2269
2270         old_flags = dev->flags;
2271         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2272                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2273                 if (err < 0)
2274                         return err;
2275         }
2276
2277         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2278
2279         __dev_notify_flags(dev, old_flags, ~0U);
2280         return 0;
2281 }
2282 EXPORT_SYMBOL(rtnl_configure_link);
2283
2284 struct net_device *rtnl_create_link(struct net *net,
2285         const char *ifname, unsigned char name_assign_type,
2286         const struct rtnl_link_ops *ops, struct nlattr *tb[])
2287 {
2288         int err;
2289         struct net_device *dev;
2290         unsigned int num_tx_queues = 1;
2291         unsigned int num_rx_queues = 1;
2292
2293         if (tb[IFLA_NUM_TX_QUEUES])
2294                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2295         else if (ops->get_num_tx_queues)
2296                 num_tx_queues = ops->get_num_tx_queues();
2297
2298         if (tb[IFLA_NUM_RX_QUEUES])
2299                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2300         else if (ops->get_num_rx_queues)
2301                 num_rx_queues = ops->get_num_rx_queues();
2302
2303         err = -ENOMEM;
2304         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2305                                ops->setup, num_tx_queues, num_rx_queues);
2306         if (!dev)
2307                 goto err;
2308
2309         dev_net_set(dev, net);
2310         dev->rtnl_link_ops = ops;
2311         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2312
2313         if (tb[IFLA_MTU])
2314                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2315         if (tb[IFLA_ADDRESS]) {
2316                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2317                                 nla_len(tb[IFLA_ADDRESS]));
2318                 dev->addr_assign_type = NET_ADDR_SET;
2319         }
2320         if (tb[IFLA_BROADCAST])
2321                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2322                                 nla_len(tb[IFLA_BROADCAST]));
2323         if (tb[IFLA_TXQLEN])
2324                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2325         if (tb[IFLA_OPERSTATE])
2326                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2327         if (tb[IFLA_LINKMODE])
2328                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2329         if (tb[IFLA_GROUP])
2330                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2331
2332         return dev;
2333
2334 err:
2335         return ERR_PTR(err);
2336 }
2337 EXPORT_SYMBOL(rtnl_create_link);
2338
2339 static int rtnl_group_changelink(const struct sk_buff *skb,
2340                 struct net *net, int group,
2341                 struct ifinfomsg *ifm,
2342                 struct nlattr **tb)
2343 {
2344         struct net_device *dev, *aux;
2345         int err;
2346
2347         for_each_netdev_safe(net, dev, aux) {
2348                 if (dev->group == group) {
2349                         err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2350                         if (err < 0)
2351                                 return err;
2352                 }
2353         }
2354
2355         return 0;
2356 }
2357
2358 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2359 {
2360         struct net *net = sock_net(skb->sk);
2361         const struct rtnl_link_ops *ops;
2362         const struct rtnl_link_ops *m_ops = NULL;
2363         struct net_device *dev;
2364         struct net_device *master_dev = NULL;
2365         struct ifinfomsg *ifm;
2366         char kind[MODULE_NAME_LEN];
2367         char ifname[IFNAMSIZ];
2368         struct nlattr *tb[IFLA_MAX+1];
2369         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2370         unsigned char name_assign_type = NET_NAME_USER;
2371         int err;
2372
2373 #ifdef CONFIG_MODULES
2374 replay:
2375 #endif
2376         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2377         if (err < 0)
2378                 return err;
2379
2380         if (tb[IFLA_IFNAME])
2381                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2382         else
2383                 ifname[0] = '\0';
2384
2385         ifm = nlmsg_data(nlh);
2386         if (ifm->ifi_index > 0)
2387                 dev = __dev_get_by_index(net, ifm->ifi_index);
2388         else {
2389                 if (ifname[0])
2390                         dev = __dev_get_by_name(net, ifname);
2391                 else
2392                         dev = NULL;
2393         }
2394
2395         if (dev) {
2396                 master_dev = netdev_master_upper_dev_get(dev);
2397                 if (master_dev)
2398                         m_ops = master_dev->rtnl_link_ops;
2399         }
2400
2401         err = validate_linkmsg(dev, tb);
2402         if (err < 0)
2403                 return err;
2404
2405         if (tb[IFLA_LINKINFO]) {
2406                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2407                                        tb[IFLA_LINKINFO], ifla_info_policy);
2408                 if (err < 0)
2409                         return err;
2410         } else
2411                 memset(linkinfo, 0, sizeof(linkinfo));
2412
2413         if (linkinfo[IFLA_INFO_KIND]) {
2414                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2415                 ops = rtnl_link_ops_get(kind);
2416         } else {
2417                 kind[0] = '\0';
2418                 ops = NULL;
2419         }
2420
2421         if (1) {
2422                 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2423                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2424                 struct nlattr **data = NULL;
2425                 struct nlattr **slave_data = NULL;
2426                 struct net *dest_net, *link_net = NULL;
2427
2428                 if (ops) {
2429                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2430                                 err = nla_parse_nested(attr, ops->maxtype,
2431                                                        linkinfo[IFLA_INFO_DATA],
2432                                                        ops->policy);
2433                                 if (err < 0)
2434                                         return err;
2435                                 data = attr;
2436                         }
2437                         if (ops->validate) {
2438                                 err = ops->validate(tb, data);
2439                                 if (err < 0)
2440                                         return err;
2441                         }
2442                 }
2443
2444                 if (m_ops) {
2445                         if (m_ops->slave_maxtype &&
2446                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2447                                 err = nla_parse_nested(slave_attr,
2448                                                        m_ops->slave_maxtype,
2449                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2450                                                        m_ops->slave_policy);
2451                                 if (err < 0)
2452                                         return err;
2453                                 slave_data = slave_attr;
2454                         }
2455                         if (m_ops->slave_validate) {
2456                                 err = m_ops->slave_validate(tb, slave_data);
2457                                 if (err < 0)
2458                                         return err;
2459                         }
2460                 }
2461
2462                 if (dev) {
2463                         int status = 0;
2464
2465                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2466                                 return -EEXIST;
2467                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2468                                 return -EOPNOTSUPP;
2469
2470                         if (linkinfo[IFLA_INFO_DATA]) {
2471                                 if (!ops || ops != dev->rtnl_link_ops ||
2472                                     !ops->changelink)
2473                                         return -EOPNOTSUPP;
2474
2475                                 err = ops->changelink(dev, tb, data);
2476                                 if (err < 0)
2477                                         return err;
2478                                 status |= DO_SETLINK_NOTIFY;
2479                         }
2480
2481                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2482                                 if (!m_ops || !m_ops->slave_changelink)
2483                                         return -EOPNOTSUPP;
2484
2485                                 err = m_ops->slave_changelink(master_dev, dev,
2486                                                               tb, slave_data);
2487                                 if (err < 0)
2488                                         return err;
2489                                 status |= DO_SETLINK_NOTIFY;
2490                         }
2491
2492                         return do_setlink(skb, dev, ifm, tb, ifname, status);
2493                 }
2494
2495                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2496                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2497                                 return rtnl_group_changelink(skb, net,
2498                                                 nla_get_u32(tb[IFLA_GROUP]),
2499                                                 ifm, tb);
2500                         return -ENODEV;
2501                 }
2502
2503                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2504                         return -EOPNOTSUPP;
2505
2506                 if (!ops) {
2507 #ifdef CONFIG_MODULES
2508                         if (kind[0]) {
2509                                 __rtnl_unlock();
2510                                 request_module("rtnl-link-%s", kind);
2511                                 rtnl_lock();
2512                                 ops = rtnl_link_ops_get(kind);
2513                                 if (ops)
2514                                         goto replay;
2515                         }
2516 #endif
2517                         return -EOPNOTSUPP;
2518                 }
2519
2520                 if (!ops->setup)
2521                         return -EOPNOTSUPP;
2522
2523                 if (!ifname[0]) {
2524                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2525                         name_assign_type = NET_NAME_ENUM;
2526                 }
2527
2528                 dest_net = rtnl_link_get_net(net, tb);
2529                 if (IS_ERR(dest_net))
2530                         return PTR_ERR(dest_net);
2531
2532                 err = -EPERM;
2533                 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2534                         goto out;
2535
2536                 if (tb[IFLA_LINK_NETNSID]) {
2537                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2538
2539                         link_net = get_net_ns_by_id(dest_net, id);
2540                         if (!link_net) {
2541                                 err =  -EINVAL;
2542                                 goto out;
2543                         }
2544                         err = -EPERM;
2545                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2546                                 goto out;
2547                 }
2548
2549                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2550                                        name_assign_type, ops, tb);
2551                 if (IS_ERR(dev)) {
2552                         err = PTR_ERR(dev);
2553                         goto out;
2554                 }
2555
2556                 dev->ifindex = ifm->ifi_index;
2557
2558                 if (ops->newlink) {
2559                         err = ops->newlink(link_net ? : net, dev, tb, data);
2560                         /* Drivers should call free_netdev() in ->destructor
2561                          * and unregister it on failure after registration
2562                          * so that device could be finally freed in rtnl_unlock.
2563                          */
2564                         if (err < 0) {
2565                                 /* If device is not registered at all, free it now */
2566                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2567                                         free_netdev(dev);
2568                                 goto out;
2569                         }
2570                 } else {
2571                         err = register_netdevice(dev);
2572                         if (err < 0) {
2573                                 free_netdev(dev);
2574                                 goto out;
2575                         }
2576                 }
2577                 err = rtnl_configure_link(dev, ifm);
2578                 if (err < 0)
2579                         goto out_unregister;
2580                 if (link_net) {
2581                         err = dev_change_net_namespace(dev, dest_net, ifname);
2582                         if (err < 0)
2583                                 goto out_unregister;
2584                 }
2585 out:
2586                 if (link_net)
2587                         put_net(link_net);
2588                 put_net(dest_net);
2589                 return err;
2590 out_unregister:
2591                 if (ops->newlink) {
2592                         LIST_HEAD(list_kill);
2593
2594                         ops->dellink(dev, &list_kill);
2595                         unregister_netdevice_many(&list_kill);
2596                 } else {
2597                         unregister_netdevice(dev);
2598                 }
2599                 goto out;
2600         }
2601 }
2602
2603 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2604 {
2605         struct net *net = sock_net(skb->sk);
2606         struct ifinfomsg *ifm;
2607         char ifname[IFNAMSIZ];
2608         struct nlattr *tb[IFLA_MAX+1];
2609         struct net_device *dev = NULL;
2610         struct sk_buff *nskb;
2611         int err;
2612         u32 ext_filter_mask = 0;
2613
2614         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2615         if (err < 0)
2616                 return err;
2617
2618         if (tb[IFLA_IFNAME])
2619                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2620
2621         if (tb[IFLA_EXT_MASK])
2622                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2623
2624         ifm = nlmsg_data(nlh);
2625         if (ifm->ifi_index > 0)
2626                 dev = __dev_get_by_index(net, ifm->ifi_index);
2627         else if (tb[IFLA_IFNAME])
2628                 dev = __dev_get_by_name(net, ifname);
2629         else
2630                 return -EINVAL;
2631
2632         if (dev == NULL)
2633                 return -ENODEV;
2634
2635         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2636         if (nskb == NULL)
2637                 return -ENOBUFS;
2638
2639         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2640                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2641         if (err < 0) {
2642                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2643                 WARN_ON(err == -EMSGSIZE);
2644                 kfree_skb(nskb);
2645         } else
2646                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2647
2648         return err;
2649 }
2650
2651 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2652 {
2653         struct net *net = sock_net(skb->sk);
2654         struct net_device *dev;
2655         struct nlattr *tb[IFLA_MAX+1];
2656         u32 ext_filter_mask = 0;
2657         u16 min_ifinfo_dump_size = 0;
2658         int hdrlen;
2659
2660         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2661         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2662                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2663
2664         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2665                 if (tb[IFLA_EXT_MASK])
2666                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2667         }
2668
2669         if (!ext_filter_mask)
2670                 return NLMSG_GOODSIZE;
2671         /*
2672          * traverse the list of net devices and compute the minimum
2673          * buffer size based upon the filter mask.
2674          */
2675         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2676                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2677                                              if_nlmsg_size(dev,
2678                                                            ext_filter_mask));
2679         }
2680
2681         return min_ifinfo_dump_size;
2682 }
2683
2684 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2685 {
2686         int idx;
2687         int s_idx = cb->family;
2688
2689         if (s_idx == 0)
2690                 s_idx = 1;
2691         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2692                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2693                 if (idx < s_idx || idx == PF_PACKET)
2694                         continue;
2695                 if (rtnl_msg_handlers[idx] == NULL ||
2696                     rtnl_msg_handlers[idx][type].dumpit == NULL)
2697                         continue;
2698                 if (idx > s_idx) {
2699                         memset(&cb->args[0], 0, sizeof(cb->args));
2700                         cb->prev_seq = 0;
2701                         cb->seq = 0;
2702                 }
2703                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2704                         break;
2705         }
2706         cb->family = idx;
2707
2708         return skb->len;
2709 }
2710
2711 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2712                                        unsigned int change, gfp_t flags)
2713 {
2714         struct net *net = dev_net(dev);
2715         struct sk_buff *skb;
2716         int err = -ENOBUFS;
2717         size_t if_info_size;
2718
2719         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2720         if (skb == NULL)
2721                 goto errout;
2722
2723         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2724         if (err < 0) {
2725                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2726                 WARN_ON(err == -EMSGSIZE);
2727                 kfree_skb(skb);
2728                 goto errout;
2729         }
2730         return skb;
2731 errout:
2732         if (err < 0)
2733                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2734         return NULL;
2735 }
2736
2737 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2738 {
2739         struct net *net = dev_net(dev);
2740
2741         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2742 }
2743
2744 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2745                   gfp_t flags)
2746 {
2747         struct sk_buff *skb;
2748
2749         if (dev->reg_state != NETREG_REGISTERED)
2750                 return;
2751
2752         skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2753         if (skb)
2754                 rtmsg_ifinfo_send(skb, dev, flags);
2755 }
2756 EXPORT_SYMBOL(rtmsg_ifinfo);
2757
2758 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2759                                    struct net_device *dev,
2760                                    u8 *addr, u16 vid, u32 pid, u32 seq,
2761                                    int type, unsigned int flags,
2762                                    int nlflags, u16 ndm_state)
2763 {
2764         struct nlmsghdr *nlh;
2765         struct ndmsg *ndm;
2766
2767         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2768         if (!nlh)
2769                 return -EMSGSIZE;
2770
2771         ndm = nlmsg_data(nlh);
2772         ndm->ndm_family  = AF_BRIDGE;
2773         ndm->ndm_pad1    = 0;
2774         ndm->ndm_pad2    = 0;
2775         ndm->ndm_flags   = flags;
2776         ndm->ndm_type    = 0;
2777         ndm->ndm_ifindex = dev->ifindex;
2778         ndm->ndm_state   = ndm_state;
2779
2780         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2781                 goto nla_put_failure;
2782         if (vid)
2783                 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2784                         goto nla_put_failure;
2785
2786         nlmsg_end(skb, nlh);
2787         return 0;
2788
2789 nla_put_failure:
2790         nlmsg_cancel(skb, nlh);
2791         return -EMSGSIZE;
2792 }
2793
2794 static inline size_t rtnl_fdb_nlmsg_size(void)
2795 {
2796         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2797 }
2798
2799 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
2800                             u16 ndm_state)
2801 {
2802         struct net *net = dev_net(dev);
2803         struct sk_buff *skb;
2804         int err = -ENOBUFS;
2805
2806         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2807         if (!skb)
2808                 goto errout;
2809
2810         err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2811                                       0, 0, type, NTF_SELF, 0, ndm_state);
2812         if (err < 0) {
2813                 kfree_skb(skb);
2814                 goto errout;
2815         }
2816
2817         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2818         return;
2819 errout:
2820         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2821 }
2822
2823 /**
2824  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2825  */
2826 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2827                      struct nlattr *tb[],
2828                      struct net_device *dev,
2829                      const unsigned char *addr, u16 vid,
2830                      u16 flags)
2831 {
2832         int err = -EINVAL;
2833
2834         /* If aging addresses are supported device will need to
2835          * implement its own handler for this.
2836          */
2837         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2838                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2839                 return err;
2840         }
2841
2842         if (vid) {
2843                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2844                 return err;
2845         }
2846
2847         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2848                 err = dev_uc_add_excl(dev, addr);
2849         else if (is_multicast_ether_addr(addr))
2850                 err = dev_mc_add_excl(dev, addr);
2851
2852         /* Only return duplicate errors if NLM_F_EXCL is set */
2853         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2854                 err = 0;
2855
2856         return err;
2857 }
2858 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2859
2860 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2861 {
2862         u16 vid = 0;
2863
2864         if (vlan_attr) {
2865                 if (nla_len(vlan_attr) != sizeof(u16)) {
2866                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2867                         return -EINVAL;
2868                 }
2869
2870                 vid = nla_get_u16(vlan_attr);
2871
2872                 if (!vid || vid >= VLAN_VID_MASK) {
2873                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2874                                 vid);
2875                         return -EINVAL;
2876                 }
2877         }
2878         *p_vid = vid;
2879         return 0;
2880 }
2881
2882 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2883 {
2884         struct net *net = sock_net(skb->sk);
2885         struct ndmsg *ndm;
2886         struct nlattr *tb[NDA_MAX+1];
2887         struct net_device *dev;
2888         u8 *addr;
2889         u16 vid;
2890         int err;
2891
2892         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2893         if (err < 0)
2894                 return err;
2895
2896         ndm = nlmsg_data(nlh);
2897         if (ndm->ndm_ifindex == 0) {
2898                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2899                 return -EINVAL;
2900         }
2901
2902         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2903         if (dev == NULL) {
2904                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2905                 return -ENODEV;
2906         }
2907
2908         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2909                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2910                 return -EINVAL;
2911         }
2912
2913         addr = nla_data(tb[NDA_LLADDR]);
2914
2915         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2916         if (err)
2917                 return err;
2918
2919         err = -EOPNOTSUPP;
2920
2921         /* Support fdb on master device the net/bridge default case */
2922         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2923             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2924                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2925                 const struct net_device_ops *ops = br_dev->netdev_ops;
2926
2927                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2928                                        nlh->nlmsg_flags);
2929                 if (err)
2930                         goto out;
2931                 else
2932                         ndm->ndm_flags &= ~NTF_MASTER;
2933         }
2934
2935         /* Embedded bridge, macvlan, and any other device support */
2936         if ((ndm->ndm_flags & NTF_SELF)) {
2937                 if (dev->netdev_ops->ndo_fdb_add)
2938                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2939                                                            vid,
2940                                                            nlh->nlmsg_flags);
2941                 else
2942                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2943                                                nlh->nlmsg_flags);
2944
2945                 if (!err) {
2946                         rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
2947                                         ndm->ndm_state);
2948                         ndm->ndm_flags &= ~NTF_SELF;
2949                 }
2950         }
2951 out:
2952         return err;
2953 }
2954
2955 /**
2956  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2957  */
2958 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2959                      struct nlattr *tb[],
2960                      struct net_device *dev,
2961                      const unsigned char *addr, u16 vid)
2962 {
2963         int err = -EINVAL;
2964
2965         /* If aging addresses are supported device will need to
2966          * implement its own handler for this.
2967          */
2968         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2969                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2970                 return err;
2971         }
2972
2973         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2974                 err = dev_uc_del(dev, addr);
2975         else if (is_multicast_ether_addr(addr))
2976                 err = dev_mc_del(dev, addr);
2977
2978         return err;
2979 }
2980 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2981
2982 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2983 {
2984         struct net *net = sock_net(skb->sk);
2985         struct ndmsg *ndm;
2986         struct nlattr *tb[NDA_MAX+1];
2987         struct net_device *dev;
2988         int err = -EINVAL;
2989         __u8 *addr;
2990         u16 vid;
2991
2992         if (!netlink_capable(skb, CAP_NET_ADMIN))
2993                 return -EPERM;
2994
2995         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2996         if (err < 0)
2997                 return err;
2998
2999         ndm = nlmsg_data(nlh);
3000         if (ndm->ndm_ifindex == 0) {
3001                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
3002                 return -EINVAL;
3003         }
3004
3005         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3006         if (dev == NULL) {
3007                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
3008                 return -ENODEV;
3009         }
3010
3011         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3012                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
3013                 return -EINVAL;
3014         }
3015
3016         addr = nla_data(tb[NDA_LLADDR]);
3017
3018         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
3019         if (err)
3020                 return err;
3021
3022         err = -EOPNOTSUPP;
3023
3024         /* Support fdb on master device the net/bridge default case */
3025         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3026             (dev->priv_flags & IFF_BRIDGE_PORT)) {
3027                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3028                 const struct net_device_ops *ops = br_dev->netdev_ops;
3029
3030                 if (ops->ndo_fdb_del)
3031                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3032
3033                 if (err)
3034                         goto out;
3035                 else
3036                         ndm->ndm_flags &= ~NTF_MASTER;
3037         }
3038
3039         /* Embedded bridge, macvlan, and any other device support */
3040         if (ndm->ndm_flags & NTF_SELF) {
3041                 if (dev->netdev_ops->ndo_fdb_del)
3042                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3043                                                            vid);
3044                 else
3045                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3046
3047                 if (!err) {
3048                         rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3049                                         ndm->ndm_state);
3050                         ndm->ndm_flags &= ~NTF_SELF;
3051                 }
3052         }
3053 out:
3054         return err;
3055 }
3056
3057 static int nlmsg_populate_fdb(struct sk_buff *skb,
3058                               struct netlink_callback *cb,
3059                               struct net_device *dev,
3060                               int *idx,
3061                               struct netdev_hw_addr_list *list)
3062 {
3063         struct netdev_hw_addr *ha;
3064         int err;
3065         u32 portid, seq;
3066
3067         portid = NETLINK_CB(cb->skb).portid;
3068         seq = cb->nlh->nlmsg_seq;
3069
3070         list_for_each_entry(ha, &list->list, list) {
3071                 if (*idx < cb->args[2])
3072                         goto skip;
3073
3074                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3075                                               portid, seq,
3076                                               RTM_NEWNEIGH, NTF_SELF,
3077                                               NLM_F_MULTI, NUD_PERMANENT);
3078                 if (err < 0)
3079                         return err;
3080 skip:
3081                 *idx += 1;
3082         }
3083         return 0;
3084 }
3085
3086 /**
3087  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3088  * @nlh: netlink message header
3089  * @dev: netdevice
3090  *
3091  * Default netdevice operation to dump the existing unicast address list.
3092  * Returns number of addresses from list put in skb.
3093  */
3094 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3095                       struct netlink_callback *cb,
3096                       struct net_device *dev,
3097                       struct net_device *filter_dev,
3098                       int *idx)
3099 {
3100         int err;
3101
3102         netif_addr_lock_bh(dev);
3103         err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3104         if (err)
3105                 goto out;
3106         nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3107 out:
3108         netif_addr_unlock_bh(dev);
3109         return err;
3110 }
3111 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3112
3113 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3114 {
3115         struct net_device *dev;
3116         struct nlattr *tb[IFLA_MAX+1];
3117         struct net_device *br_dev = NULL;
3118         const struct net_device_ops *ops = NULL;
3119         const struct net_device_ops *cops = NULL;
3120         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3121         struct net *net = sock_net(skb->sk);
3122         struct hlist_head *head;
3123         int brport_idx = 0;
3124         int br_idx = 0;
3125         int h, s_h;
3126         int idx = 0, s_idx;
3127         int err = 0;
3128         int fidx = 0;
3129
3130         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
3131                         ifla_policy) == 0) {
3132                 if (tb[IFLA_MASTER])
3133                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
3134         }
3135
3136         brport_idx = ifm->ifi_index;
3137
3138         if (br_idx) {
3139                 br_dev = __dev_get_by_index(net, br_idx);
3140                 if (!br_dev)
3141                         return -ENODEV;
3142
3143                 ops = br_dev->netdev_ops;
3144         }
3145
3146         s_h = cb->args[0];
3147         s_idx = cb->args[1];
3148
3149         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3150                 idx = 0;
3151                 head = &net->dev_index_head[h];
3152                 hlist_for_each_entry(dev, head, index_hlist) {
3153
3154                         if (brport_idx && (dev->ifindex != brport_idx))
3155                                 continue;
3156
3157                         if (!br_idx) { /* user did not specify a specific bridge */
3158                                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3159                                         br_dev = netdev_master_upper_dev_get(dev);
3160                                         cops = br_dev->netdev_ops;
3161                                 }
3162                         } else {
3163                                 if (dev != br_dev &&
3164                                     !(dev->priv_flags & IFF_BRIDGE_PORT))
3165                                         continue;
3166
3167                                 if (br_dev != netdev_master_upper_dev_get(dev) &&
3168                                     !(dev->priv_flags & IFF_EBRIDGE))
3169                                         continue;
3170                                 cops = ops;
3171                         }
3172
3173                         if (idx < s_idx)
3174                                 goto cont;
3175
3176                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
3177                                 if (cops && cops->ndo_fdb_dump) {
3178                                         err = cops->ndo_fdb_dump(skb, cb,
3179                                                                 br_dev, dev,
3180                                                                 &fidx);
3181                                         if (err == -EMSGSIZE)
3182                                                 goto out;
3183                                 }
3184                         }
3185
3186                         if (dev->netdev_ops->ndo_fdb_dump)
3187                                 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3188                                                                     dev, NULL,
3189                                                                     &fidx);
3190                         else
3191                                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
3192                                                         &fidx);
3193                         if (err == -EMSGSIZE)
3194                                 goto out;
3195
3196                         cops = NULL;
3197
3198                         /* reset fdb offset to 0 for rest of the interfaces */
3199                         cb->args[2] = 0;
3200                         fidx = 0;
3201 cont:
3202                         idx++;
3203                 }
3204         }
3205
3206 out:
3207         cb->args[0] = h;
3208         cb->args[1] = idx;
3209         cb->args[2] = fidx;
3210
3211         return skb->len;
3212 }
3213
3214 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3215                                unsigned int attrnum, unsigned int flag)
3216 {
3217         if (mask & flag)
3218                 return nla_put_u8(skb, attrnum, !!(flags & flag));
3219         return 0;
3220 }
3221
3222 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3223                             struct net_device *dev, u16 mode,
3224                             u32 flags, u32 mask, int nlflags,
3225                             u32 filter_mask,
3226                             int (*vlan_fill)(struct sk_buff *skb,
3227                                              struct net_device *dev,
3228                                              u32 filter_mask))
3229 {
3230         struct nlmsghdr *nlh;
3231         struct ifinfomsg *ifm;
3232         struct nlattr *br_afspec;
3233         struct nlattr *protinfo;
3234         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3235         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3236         int err = 0;
3237
3238         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3239         if (nlh == NULL)
3240                 return -EMSGSIZE;
3241
3242         ifm = nlmsg_data(nlh);
3243         ifm->ifi_family = AF_BRIDGE;
3244         ifm->__ifi_pad = 0;
3245         ifm->ifi_type = dev->type;
3246         ifm->ifi_index = dev->ifindex;
3247         ifm->ifi_flags = dev_get_flags(dev);
3248         ifm->ifi_change = 0;
3249
3250
3251         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3252             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3253             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3254             (br_dev &&
3255              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3256             (dev->addr_len &&
3257              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3258             (dev->ifindex != dev_get_iflink(dev) &&
3259              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3260                 goto nla_put_failure;
3261
3262         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3263         if (!br_afspec)
3264                 goto nla_put_failure;
3265
3266         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3267                 nla_nest_cancel(skb, br_afspec);
3268                 goto nla_put_failure;
3269         }
3270
3271         if (mode != BRIDGE_MODE_UNDEF) {
3272                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3273                         nla_nest_cancel(skb, br_afspec);
3274                         goto nla_put_failure;
3275                 }
3276         }
3277         if (vlan_fill) {
3278                 err = vlan_fill(skb, dev, filter_mask);
3279                 if (err) {
3280                         nla_nest_cancel(skb, br_afspec);
3281                         goto nla_put_failure;
3282                 }
3283         }
3284         nla_nest_end(skb, br_afspec);
3285
3286         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3287         if (!protinfo)
3288                 goto nla_put_failure;
3289
3290         if (brport_nla_put_flag(skb, flags, mask,
3291                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3292             brport_nla_put_flag(skb, flags, mask,
3293                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3294             brport_nla_put_flag(skb, flags, mask,
3295                                 IFLA_BRPORT_FAST_LEAVE,
3296                                 BR_MULTICAST_FAST_LEAVE) ||
3297             brport_nla_put_flag(skb, flags, mask,
3298                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3299             brport_nla_put_flag(skb, flags, mask,
3300                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3301             brport_nla_put_flag(skb, flags, mask,
3302                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3303             brport_nla_put_flag(skb, flags, mask,
3304                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3305             brport_nla_put_flag(skb, flags, mask,
3306                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3307                 nla_nest_cancel(skb, protinfo);
3308                 goto nla_put_failure;
3309         }
3310
3311         nla_nest_end(skb, protinfo);
3312
3313         nlmsg_end(skb, nlh);
3314         return 0;
3315 nla_put_failure:
3316         nlmsg_cancel(skb, nlh);
3317         return err ? err : -EMSGSIZE;
3318 }
3319 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3320
3321 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3322 {
3323         struct net *net = sock_net(skb->sk);
3324         struct net_device *dev;
3325         int idx = 0;
3326         u32 portid = NETLINK_CB(cb->skb).portid;
3327         u32 seq = cb->nlh->nlmsg_seq;
3328         u32 filter_mask = 0;
3329         int err;
3330
3331         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3332                 struct nlattr *extfilt;
3333
3334                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3335                                           IFLA_EXT_MASK);
3336                 if (extfilt) {
3337                         if (nla_len(extfilt) < sizeof(filter_mask))
3338                                 return -EINVAL;
3339
3340                         filter_mask = nla_get_u32(extfilt);
3341                 }
3342         }
3343
3344         rcu_read_lock();
3345         for_each_netdev_rcu(net, dev) {
3346                 const struct net_device_ops *ops = dev->netdev_ops;
3347                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3348
3349                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3350                         if (idx >= cb->args[0]) {
3351                                 err = br_dev->netdev_ops->ndo_bridge_getlink(
3352                                                 skb, portid, seq, dev,
3353                                                 filter_mask, NLM_F_MULTI);
3354                                 if (err < 0 && err != -EOPNOTSUPP)
3355                                         break;
3356                         }
3357                         idx++;
3358                 }
3359
3360                 if (ops->ndo_bridge_getlink) {
3361                         if (idx >= cb->args[0]) {
3362                                 err = ops->ndo_bridge_getlink(skb, portid,
3363                                                               seq, dev,
3364                                                               filter_mask,
3365                                                               NLM_F_MULTI);
3366                                 if (err < 0 && err != -EOPNOTSUPP)
3367                                         break;
3368                         }
3369                         idx++;
3370                 }
3371         }
3372         rcu_read_unlock();
3373         cb->args[0] = idx;
3374
3375         return skb->len;
3376 }
3377
3378 static inline size_t bridge_nlmsg_size(void)
3379 {
3380         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3381                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
3382                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
3383                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
3384                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
3385                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
3386                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
3387                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
3388                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3389                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
3390                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
3391 }
3392
3393 static int rtnl_bridge_notify(struct net_device *dev)
3394 {
3395         struct net *net = dev_net(dev);
3396         struct sk_buff *skb;
3397         int err = -EOPNOTSUPP;
3398
3399         if (!dev->netdev_ops->ndo_bridge_getlink)
3400                 return 0;
3401
3402         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3403         if (!skb) {
3404                 err = -ENOMEM;
3405                 goto errout;
3406         }
3407
3408         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3409         if (err < 0)
3410                 goto errout;
3411
3412         if (!skb->len)
3413                 goto errout;
3414
3415         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3416         return 0;
3417 errout:
3418         WARN_ON(err == -EMSGSIZE);
3419         kfree_skb(skb);
3420         if (err)
3421                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3422         return err;
3423 }
3424
3425 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3426 {
3427         struct net *net = sock_net(skb->sk);
3428         struct ifinfomsg *ifm;
3429         struct net_device *dev;
3430         struct nlattr *br_spec, *attr = NULL;
3431         int rem, err = -EOPNOTSUPP;
3432         u16 flags = 0;
3433         bool have_flags = false;
3434
3435         if (nlmsg_len(nlh) < sizeof(*ifm))
3436                 return -EINVAL;
3437
3438         ifm = nlmsg_data(nlh);
3439         if (ifm->ifi_family != AF_BRIDGE)
3440                 return -EPFNOSUPPORT;
3441
3442         dev = __dev_get_by_index(net, ifm->ifi_index);
3443         if (!dev) {
3444                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3445                 return -ENODEV;
3446         }
3447
3448         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3449         if (br_spec) {
3450                 nla_for_each_nested(attr, br_spec, rem) {
3451                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3452                                 if (nla_len(attr) < sizeof(flags))
3453                                         return -EINVAL;
3454
3455                                 have_flags = true;
3456                                 flags = nla_get_u16(attr);
3457                                 break;
3458                         }
3459                 }
3460         }
3461
3462         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3463                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3464
3465                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3466                         err = -EOPNOTSUPP;
3467                         goto out;
3468                 }
3469
3470                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3471                 if (err)
3472                         goto out;
3473
3474                 flags &= ~BRIDGE_FLAGS_MASTER;
3475         }
3476
3477         if ((flags & BRIDGE_FLAGS_SELF)) {
3478                 if (!dev->netdev_ops->ndo_bridge_setlink)
3479                         err = -EOPNOTSUPP;
3480                 else
3481                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3482                                                                   flags);
3483                 if (!err) {
3484                         flags &= ~BRIDGE_FLAGS_SELF;
3485
3486                         /* Generate event to notify upper layer of bridge
3487                          * change
3488                          */
3489                         err = rtnl_bridge_notify(dev);
3490                 }
3491         }
3492
3493         if (have_flags)
3494                 memcpy(nla_data(attr), &flags, sizeof(flags));
3495 out:
3496         return err;
3497 }
3498
3499 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3500 {
3501         struct net *net = sock_net(skb->sk);
3502         struct ifinfomsg *ifm;
3503         struct net_device *dev;
3504         struct nlattr *br_spec, *attr = NULL;
3505         int rem, err = -EOPNOTSUPP;
3506         u16 flags = 0;
3507         bool have_flags = false;
3508
3509         if (nlmsg_len(nlh) < sizeof(*ifm))
3510                 return -EINVAL;
3511
3512         ifm = nlmsg_data(nlh);
3513         if (ifm->ifi_family != AF_BRIDGE)
3514                 return -EPFNOSUPPORT;
3515
3516         dev = __dev_get_by_index(net, ifm->ifi_index);
3517         if (!dev) {
3518                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3519                 return -ENODEV;
3520         }
3521
3522         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3523         if (br_spec) {
3524                 nla_for_each_nested(attr, br_spec, rem) {
3525                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3526                                 if (nla_len(attr) < sizeof(flags))
3527                                         return -EINVAL;
3528
3529                                 have_flags = true;
3530                                 flags = nla_get_u16(attr);
3531                                 break;
3532                         }
3533                 }
3534         }
3535
3536         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3537                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3538
3539                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3540                         err = -EOPNOTSUPP;
3541                         goto out;
3542                 }
3543
3544                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3545                 if (err)
3546                         goto out;
3547
3548                 flags &= ~BRIDGE_FLAGS_MASTER;
3549         }
3550
3551         if ((flags & BRIDGE_FLAGS_SELF)) {
3552                 if (!dev->netdev_ops->ndo_bridge_dellink)
3553                         err = -EOPNOTSUPP;
3554                 else
3555                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3556                                                                   flags);
3557
3558                 if (!err) {
3559                         flags &= ~BRIDGE_FLAGS_SELF;
3560
3561                         /* Generate event to notify upper layer of bridge
3562                          * change
3563                          */
3564                         err = rtnl_bridge_notify(dev);
3565                 }
3566         }
3567
3568         if (have_flags)
3569                 memcpy(nla_data(attr), &flags, sizeof(flags));
3570 out:
3571         return err;
3572 }
3573
3574 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
3575 {
3576         return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
3577                (!idxattr || idxattr == attrid);
3578 }
3579
3580 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
3581 static int rtnl_get_offload_stats_attr_size(int attr_id)
3582 {
3583         switch (attr_id) {
3584         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
3585                 return sizeof(struct rtnl_link_stats64);
3586         }
3587
3588         return 0;
3589 }
3590
3591 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
3592                                   int *prividx)
3593 {
3594         struct nlattr *attr = NULL;
3595         int attr_id, size;
3596         void *attr_data;
3597         int err;
3598
3599         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3600               dev->netdev_ops->ndo_get_offload_stats))
3601                 return -ENODATA;
3602
3603         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3604              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3605                 if (attr_id < *prividx)
3606                         continue;
3607
3608                 size = rtnl_get_offload_stats_attr_size(attr_id);
3609                 if (!size)
3610                         continue;
3611
3612                 if (!dev->netdev_ops->ndo_has_offload_stats(attr_id))
3613                         continue;
3614
3615                 attr = nla_reserve_64bit(skb, attr_id, size,
3616                                          IFLA_OFFLOAD_XSTATS_UNSPEC);
3617                 if (!attr)
3618                         goto nla_put_failure;
3619
3620                 attr_data = nla_data(attr);
3621                 memset(attr_data, 0, size);
3622                 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
3623                                                              attr_data);
3624                 if (err)
3625                         goto get_offload_stats_failure;
3626         }
3627
3628         if (!attr)
3629                 return -ENODATA;
3630
3631         *prividx = 0;
3632         return 0;
3633
3634 nla_put_failure:
3635         err = -EMSGSIZE;
3636 get_offload_stats_failure:
3637         *prividx = attr_id;
3638         return err;
3639 }
3640
3641 static int rtnl_get_offload_stats_size(const struct net_device *dev)
3642 {
3643         int nla_size = 0;
3644         int attr_id;
3645         int size;
3646
3647         if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3648               dev->netdev_ops->ndo_get_offload_stats))
3649                 return 0;
3650
3651         for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3652              attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3653                 if (!dev->netdev_ops->ndo_has_offload_stats(attr_id))
3654                         continue;
3655                 size = rtnl_get_offload_stats_attr_size(attr_id);
3656                 nla_size += nla_total_size_64bit(size);
3657         }
3658
3659         if (nla_size != 0)
3660                 nla_size += nla_total_size(0);
3661
3662         return nla_size;
3663 }
3664
3665 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
3666                                int type, u32 pid, u32 seq, u32 change,
3667                                unsigned int flags, unsigned int filter_mask,
3668                                int *idxattr, int *prividx)
3669 {
3670         struct if_stats_msg *ifsm;
3671         struct nlmsghdr *nlh;
3672         struct nlattr *attr;
3673         int s_prividx = *prividx;
3674         int err;
3675
3676         ASSERT_RTNL();
3677
3678         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
3679         if (!nlh)
3680                 return -EMSGSIZE;
3681
3682         ifsm = nlmsg_data(nlh);
3683         ifsm->ifindex = dev->ifindex;
3684         ifsm->filter_mask = filter_mask;
3685
3686         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
3687                 struct rtnl_link_stats64 *sp;
3688
3689                 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
3690                                          sizeof(struct rtnl_link_stats64),
3691                                          IFLA_STATS_UNSPEC);
3692                 if (!attr)
3693                         goto nla_put_failure;
3694
3695                 sp = nla_data(attr);
3696                 dev_get_stats(dev, sp);
3697         }
3698
3699         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
3700                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3701
3702                 if (ops && ops->fill_linkxstats) {
3703                         *idxattr = IFLA_STATS_LINK_XSTATS;
3704                         attr = nla_nest_start(skb,
3705                                               IFLA_STATS_LINK_XSTATS);
3706                         if (!attr)
3707                                 goto nla_put_failure;
3708
3709                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3710                         nla_nest_end(skb, attr);
3711                         if (err)
3712                                 goto nla_put_failure;
3713                         *idxattr = 0;
3714                 }
3715         }
3716
3717         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
3718                              *idxattr)) {
3719                 const struct rtnl_link_ops *ops = NULL;
3720                 const struct net_device *master;
3721
3722                 master = netdev_master_upper_dev_get(dev);
3723                 if (master)
3724                         ops = master->rtnl_link_ops;
3725                 if (ops && ops->fill_linkxstats) {
3726                         *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
3727                         attr = nla_nest_start(skb,
3728                                               IFLA_STATS_LINK_XSTATS_SLAVE);
3729                         if (!attr)
3730                                 goto nla_put_failure;
3731
3732                         err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3733                         nla_nest_end(skb, attr);
3734                         if (err)
3735                                 goto nla_put_failure;
3736                         *idxattr = 0;
3737                 }
3738         }
3739
3740         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
3741                              *idxattr)) {
3742                 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
3743                 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
3744                 if (!attr)
3745                         goto nla_put_failure;
3746
3747                 err = rtnl_get_offload_stats(skb, dev, prividx);
3748                 if (err == -ENODATA)
3749                         nla_nest_cancel(skb, attr);
3750                 else
3751                         nla_nest_end(skb, attr);
3752
3753                 if (err && err != -ENODATA)
3754                         goto nla_put_failure;
3755                 *idxattr = 0;
3756         }
3757
3758         nlmsg_end(skb, nlh);
3759
3760         return 0;
3761
3762 nla_put_failure:
3763         /* not a multi message or no progress mean a real error */
3764         if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
3765                 nlmsg_cancel(skb, nlh);
3766         else
3767                 nlmsg_end(skb, nlh);
3768
3769         return -EMSGSIZE;
3770 }
3771
3772 static size_t if_nlmsg_stats_size(const struct net_device *dev,
3773                                   u32 filter_mask)
3774 {
3775         size_t size = 0;
3776
3777         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
3778                 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
3779
3780         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
3781                 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3782                 int attr = IFLA_STATS_LINK_XSTATS;
3783
3784                 if (ops && ops->get_linkxstats_size) {
3785                         size += nla_total_size(ops->get_linkxstats_size(dev,
3786                                                                         attr));
3787                         /* for IFLA_STATS_LINK_XSTATS */
3788                         size += nla_total_size(0);
3789                 }
3790         }
3791
3792         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
3793                 struct net_device *_dev = (struct net_device *)dev;
3794                 const struct rtnl_link_ops *ops = NULL;
3795                 const struct net_device *master;
3796
3797                 /* netdev_master_upper_dev_get can't take const */
3798                 master = netdev_master_upper_dev_get(_dev);
3799                 if (master)
3800                         ops = master->rtnl_link_ops;
3801                 if (ops && ops->get_linkxstats_size) {
3802                         int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
3803
3804                         size += nla_total_size(ops->get_linkxstats_size(dev,
3805                                                                         attr));
3806                         /* for IFLA_STATS_LINK_XSTATS_SLAVE */
3807                         size += nla_total_size(0);
3808                 }
3809         }
3810
3811         if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
3812                 size += rtnl_get_offload_stats_size(dev);
3813
3814         return size;
3815 }
3816
3817 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh)
3818 {
3819         struct net *net = sock_net(skb->sk);
3820         struct net_device *dev = NULL;
3821         int idxattr = 0, prividx = 0;
3822         struct if_stats_msg *ifsm;
3823         struct sk_buff *nskb;
3824         u32 filter_mask;
3825         int err;
3826
3827         ifsm = nlmsg_data(nlh);
3828         if (ifsm->ifindex > 0)
3829                 dev = __dev_get_by_index(net, ifsm->ifindex);
3830         else
3831                 return -EINVAL;
3832
3833         if (!dev)
3834                 return -ENODEV;
3835
3836         filter_mask = ifsm->filter_mask;
3837         if (!filter_mask)
3838                 return -EINVAL;
3839
3840         nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
3841         if (!nskb)
3842                 return -ENOBUFS;
3843
3844         err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
3845                                   NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
3846                                   0, filter_mask, &idxattr, &prividx);
3847         if (err < 0) {
3848                 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
3849                 WARN_ON(err == -EMSGSIZE);
3850                 kfree_skb(nskb);
3851         } else {
3852                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3853         }
3854
3855         return err;
3856 }
3857
3858 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
3859 {
3860         int h, s_h, err, s_idx, s_idxattr, s_prividx;
3861         struct net *net = sock_net(skb->sk);
3862         unsigned int flags = NLM_F_MULTI;
3863         struct if_stats_msg *ifsm;
3864         struct hlist_head *head;
3865         struct net_device *dev;
3866         u32 filter_mask = 0;
3867         int idx = 0;
3868
3869         s_h = cb->args[0];
3870         s_idx = cb->args[1];
3871         s_idxattr = cb->args[2];
3872         s_prividx = cb->args[3];
3873
3874         cb->seq = net->dev_base_seq;
3875
3876         ifsm = nlmsg_data(cb->nlh);
3877         filter_mask = ifsm->filter_mask;
3878         if (!filter_mask)
3879                 return -EINVAL;
3880
3881         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3882                 idx = 0;
3883                 head = &net->dev_index_head[h];
3884                 hlist_for_each_entry(dev, head, index_hlist) {
3885                         if (idx < s_idx)
3886                                 goto cont;
3887                         err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
3888                                                   NETLINK_CB(cb->skb).portid,
3889                                                   cb->nlh->nlmsg_seq, 0,
3890                                                   flags, filter_mask,
3891                                                   &s_idxattr, &s_prividx);
3892                         /* If we ran out of room on the first message,
3893                          * we're in trouble
3894                          */
3895                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
3896
3897                         if (err < 0)
3898                                 goto out;
3899                         s_prividx = 0;
3900                         s_idxattr = 0;
3901                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3902 cont:
3903                         idx++;
3904                 }
3905         }
3906 out:
3907         cb->args[3] = s_prividx;
3908         cb->args[2] = s_idxattr;
3909         cb->args[1] = idx;
3910         cb->args[0] = h;
3911
3912         return skb->len;
3913 }
3914
3915 /* Process one rtnetlink message. */
3916
3917 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3918 {
3919         struct net *net = sock_net(skb->sk);
3920         rtnl_doit_func doit;
3921         int kind;
3922         int family;
3923         int type;
3924         int err;
3925
3926         type = nlh->nlmsg_type;
3927         if (type > RTM_MAX)
3928                 return -EOPNOTSUPP;
3929
3930         type -= RTM_BASE;
3931
3932         /* All the messages must have at least 1 byte length */
3933         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3934                 return 0;
3935
3936         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3937         kind = type&3;
3938
3939         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3940                 return -EPERM;
3941
3942         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3943                 struct sock *rtnl;
3944                 rtnl_dumpit_func dumpit;
3945                 rtnl_calcit_func calcit;
3946                 u16 min_dump_alloc = 0;
3947
3948                 dumpit = rtnl_get_dumpit(family, type);
3949                 if (dumpit == NULL)
3950                         return -EOPNOTSUPP;
3951                 calcit = rtnl_get_calcit(family, type);
3952                 if (calcit)
3953                         min_dump_alloc = calcit(skb, nlh);
3954
3955                 __rtnl_unlock();
3956                 rtnl = net->rtnl;
3957                 {
3958                         struct netlink_dump_control c = {
3959                                 .dump           = dumpit,
3960                                 .min_dump_alloc = min_dump_alloc,
3961                         };
3962                         err = netlink_dump_start(rtnl, skb, nlh, &c);
3963                 }
3964                 rtnl_lock();
3965                 return err;
3966         }
3967
3968         doit = rtnl_get_doit(family, type);
3969         if (doit == NULL)
3970                 return -EOPNOTSUPP;
3971
3972         return doit(skb, nlh);
3973 }
3974
3975 static void rtnetlink_rcv(struct sk_buff *skb)
3976 {
3977         rtnl_lock();
3978         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3979         rtnl_unlock();
3980 }
3981
3982 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3983 {
3984         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3985
3986         switch (event) {
3987         case NETDEV_UP:
3988         case NETDEV_DOWN:
3989         case NETDEV_PRE_UP:
3990         case NETDEV_POST_INIT:
3991         case NETDEV_REGISTER:
3992         case NETDEV_CHANGE:
3993         case NETDEV_PRE_TYPE_CHANGE:
3994         case NETDEV_GOING_DOWN:
3995         case NETDEV_UNREGISTER:
3996         case NETDEV_UNREGISTER_FINAL:
3997         case NETDEV_RELEASE:
3998         case NETDEV_JOIN:
3999         case NETDEV_BONDING_INFO:
4000                 break;
4001         default:
4002                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
4003                 break;
4004         }
4005         return NOTIFY_DONE;
4006 }
4007
4008 static struct notifier_block rtnetlink_dev_notifier = {
4009         .notifier_call  = rtnetlink_event,
4010 };
4011
4012
4013 static int __net_init rtnetlink_net_init(struct net *net)
4014 {
4015         struct sock *sk;
4016         struct netlink_kernel_cfg cfg = {
4017                 .groups         = RTNLGRP_MAX,
4018                 .input          = rtnetlink_rcv,
4019                 .cb_mutex       = &rtnl_mutex,
4020                 .flags          = NL_CFG_F_NONROOT_RECV,
4021         };
4022
4023         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
4024         if (!sk)
4025                 return -ENOMEM;
4026         net->rtnl = sk;
4027         return 0;
4028 }
4029
4030 static void __net_exit rtnetlink_net_exit(struct net *net)
4031 {
4032         netlink_kernel_release(net->rtnl);
4033         net->rtnl = NULL;
4034 }
4035
4036 static struct pernet_operations rtnetlink_net_ops = {
4037         .init = rtnetlink_net_init,
4038         .exit = rtnetlink_net_exit,
4039 };
4040
4041 void __init rtnetlink_init(void)
4042 {
4043         if (register_pernet_subsys(&rtnetlink_net_ops))
4044                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
4045
4046         register_netdevice_notifier(&rtnetlink_dev_notifier);
4047
4048         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
4049                       rtnl_dump_ifinfo, rtnl_calcit);
4050         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
4051         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
4052         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
4053
4054         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
4055         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
4056
4057         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
4058         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
4059         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
4060
4061         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
4062         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
4063         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
4064
4065         rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
4066                       NULL);
4067 }