net/core/rtnetlink.c

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