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/pci.h>
  39
  40 #include <asm/uaccess.h>
  41 #include <asm/system.h>
  42
  43 #include <linux/inet.h>
  44 #include <linux/netdevice.h>
  45 #include <net/ip.h>
  46 #include <net/protocol.h>
  47 #include <net/arp.h>
  48 #include <net/route.h>
  49 #include <net/udp.h>
  50 #include <net/sock.h>
  51 #include <net/pkt_sched.h>
  52 #include <net/fib_rules.h>
  53 #include <net/rtnetlink.h>
  54 #include <net/net_namespace.h>
  55
  56 struct rtnl_link {
  57         rtnl_doit_func          doit;
  58         rtnl_dumpit_func        dumpit;
  59         rtnl_calcit_func        calcit;
  60 };
  61
  62 static DEFINE_MUTEX(rtnl_mutex);
  63 static u16 min_ifinfo_dump_size;
  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 ? tab[msgindex].doit : NULL;
 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 ? tab[msgindex].dumpit : NULL;
 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 ? tab[msgindex].calcit : NULL;
 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 /**
 277  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 278  * @ops: struct rtnl_link_ops * to register
 279  *
 280  * The caller must hold the rtnl_mutex. This function should be used
 281  * by drivers that create devices during module initialization. It
 282  * must be called before registering the devices.
 283  *
 284  * Returns 0 on success or a negative error code.
 285  */
 286 int __rtnl_link_register(struct rtnl_link_ops *ops)
 287 {
 288         if (!ops->dellink)
 289                 ops->dellink = unregister_netdevice_queue;
 290
 291         list_add_tail(&ops->list, &link_ops);
 292         return 0;
 293 }
 294 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 295
 296 /**
 297  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 298  * @ops: struct rtnl_link_ops * to register
 299  *
 300  * Returns 0 on success or a negative error code.
 301  */
 302 int rtnl_link_register(struct rtnl_link_ops *ops)
 303 {
 304         int err;
 305
 306         rtnl_lock();
 307         err = __rtnl_link_register(ops);
 308         rtnl_unlock();
 309         return err;
 310 }
 311 EXPORT_SYMBOL_GPL(rtnl_link_register);
 312
 313 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 314 {
 315         struct net_device *dev;
 316         LIST_HEAD(list_kill);
 317
 318         for_each_netdev(net, dev) {
 319                 if (dev->rtnl_link_ops == ops)
 320                         ops->dellink(dev, &list_kill);
 321         }
 322         unregister_netdevice_many(&list_kill);
 323 }
 324
 325 /**
 326  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 327  * @ops: struct rtnl_link_ops * to unregister
 328  *
 329  * The caller must hold the rtnl_mutex.
 330  */
 331 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 332 {
 333         struct net *net;
 334
 335         for_each_net(net) {
 336                 __rtnl_kill_links(net, ops);
 337         }
 338         list_del(&ops->list);
 339 }
 340 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 341
 342 /**
 343  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 344  * @ops: struct rtnl_link_ops * to unregister
 345  */
 346 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 347 {
 348         rtnl_lock();
 349         __rtnl_link_unregister(ops);
 350         rtnl_unlock();
 351 }
 352 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 353
 354 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 355 {
 356         const struct rtnl_link_ops *ops;
 357
 358         list_for_each_entry(ops, &link_ops, list) {
 359                 if (!strcmp(ops->kind, kind))
 360                         return ops;
 361         }
 362         return NULL;
 363 }
 364
 365 static size_t rtnl_link_get_size(const struct net_device *dev)
 366 {
 367         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 368         size_t size;
 369
 370         if (!ops)
 371                 return 0;
 372
 373         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 374                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 375
 376         if (ops->get_size)
 377                 /* IFLA_INFO_DATA + nested data */
 378                 size += nla_total_size(sizeof(struct nlattr)) +
 379                         ops->get_size(dev);
 380
 381         if (ops->get_xstats_size)
 382                 /* IFLA_INFO_XSTATS */
 383                 size += nla_total_size(ops->get_xstats_size(dev));
 384
 385         return size;
 386 }
 387
 388 static LIST_HEAD(rtnl_af_ops);
 389
 390 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 391 {
 392         const struct rtnl_af_ops *ops;
 393
 394         list_for_each_entry(ops, &rtnl_af_ops, list) {
 395                 if (ops->family == family)
 396                         return ops;
 397         }
 398
 399         return NULL;
 400 }
 401
 402 /**
 403  * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 404  * @ops: struct rtnl_af_ops * to register
 405  *
 406  * The caller must hold the rtnl_mutex.
 407  *
 408  * Returns 0 on success or a negative error code.
 409  */
 410 int __rtnl_af_register(struct rtnl_af_ops *ops)
 411 {
 412         list_add_tail(&ops->list, &rtnl_af_ops);
 413         return 0;
 414 }
 415 EXPORT_SYMBOL_GPL(__rtnl_af_register);
 416
 417 /**
 418  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 419  * @ops: struct rtnl_af_ops * to register
 420  *
 421  * Returns 0 on success or a negative error code.
 422  */
 423 int rtnl_af_register(struct rtnl_af_ops *ops)
 424 {
 425         int err;
 426
 427         rtnl_lock();
 428         err = __rtnl_af_register(ops);
 429         rtnl_unlock();
 430         return err;
 431 }
 432 EXPORT_SYMBOL_GPL(rtnl_af_register);
 433
 434 /**
 435  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 436  * @ops: struct rtnl_af_ops * to unregister
 437  *
 438  * The caller must hold the rtnl_mutex.
 439  */
 440 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 441 {
 442         list_del(&ops->list);
 443 }
 444 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 445
 446 /**
 447  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 448  * @ops: struct rtnl_af_ops * to unregister
 449  */
 450 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 451 {
 452         rtnl_lock();
 453         __rtnl_af_unregister(ops);
 454         rtnl_unlock();
 455 }
 456 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 457
 458 static size_t rtnl_link_get_af_size(const struct net_device *dev)
 459 {
 460         struct rtnl_af_ops *af_ops;
 461         size_t size;
 462
 463         /* IFLA_AF_SPEC */
 464         size = nla_total_size(sizeof(struct nlattr));
 465
 466         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 467                 if (af_ops->get_link_af_size) {
 468                         /* AF_* + nested data */
 469                         size += nla_total_size(sizeof(struct nlattr)) +
 470                                 af_ops->get_link_af_size(dev);
 471                 }
 472         }
 473
 474         return size;
 475 }
 476
 477 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 478 {
 479         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 480         struct nlattr *linkinfo, *data;
 481         int err = -EMSGSIZE;
 482
 483         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 484         if (linkinfo == NULL)
 485                 goto out;
 486
 487         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 488                 goto err_cancel_link;
 489         if (ops->fill_xstats) {
 490                 err = ops->fill_xstats(skb, dev);
 491                 if (err < 0)
 492                         goto err_cancel_link;
 493         }
 494         if (ops->fill_info) {
 495                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 496                 if (data == NULL)
 497                         goto err_cancel_link;
 498                 err = ops->fill_info(skb, dev);
 499                 if (err < 0)
 500                         goto err_cancel_data;
 501                 nla_nest_end(skb, data);
 502         }
 503
 504         nla_nest_end(skb, linkinfo);
 505         return 0;
 506
 507 err_cancel_data:
 508         nla_nest_cancel(skb, data);
 509 err_cancel_link:
 510         nla_nest_cancel(skb, linkinfo);
 511 out:
 512         return err;
 513 }
 514
 515 static const int rtm_min[RTM_NR_FAMILIES] =
 516 {
 517         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 518         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
 519         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
 520         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
 521         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
 522         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
 523         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
 524         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
 525         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 526         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 527 };
 528
 529 static const int rta_max[RTM_NR_FAMILIES] =
 530 {
 531         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 532         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 533         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 534         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
 535         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 536         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 537         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 538         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 539 };
 540
 541 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 542 {
 543         struct rtattr *rta;
 544         int size = RTA_LENGTH(attrlen);
 545
 546         rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
 547         rta->rta_type = attrtype;
 548         rta->rta_len = size;
 549         memcpy(RTA_DATA(rta), data, attrlen);
 550         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 551 }
 552 EXPORT_SYMBOL(__rta_fill);
 553
 554 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
 555 {
 556         struct sock *rtnl = net->rtnl;
 557         int err = 0;
 558
 559         NETLINK_CB(skb).dst_group = group;
 560         if (echo)
 561                 atomic_inc(&skb->users);
 562         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 563         if (echo)
 564                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 565         return err;
 566 }
 567
 568 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 569 {
 570         struct sock *rtnl = net->rtnl;
 571
 572         return nlmsg_unicast(rtnl, skb, pid);
 573 }
 574 EXPORT_SYMBOL(rtnl_unicast);
 575
 576 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 577                  struct nlmsghdr *nlh, gfp_t flags)
 578 {
 579         struct sock *rtnl = net->rtnl;
 580         int report = 0;
 581
 582         if (nlh)
 583                 report = nlmsg_report(nlh);
 584
 585         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 586 }
 587 EXPORT_SYMBOL(rtnl_notify);
 588
 589 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 590 {
 591         struct sock *rtnl = net->rtnl;
 592
 593         netlink_set_err(rtnl, 0, group, error);
 594 }
 595 EXPORT_SYMBOL(rtnl_set_sk_err);
 596
 597 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 598 {
 599         struct nlattr *mx;
 600         int i, valid = 0;
 601
 602         mx = nla_nest_start(skb, RTA_METRICS);
 603         if (mx == NULL)
 604                 return -ENOBUFS;
 605
 606         for (i = 0; i < RTAX_MAX; i++) {
 607                 if (metrics[i]) {
 608                         valid++;
 609                         NLA_PUT_U32(skb, i+1, metrics[i]);
 610                 }
 611         }
 612
 613         if (!valid) {
 614                 nla_nest_cancel(skb, mx);
 615                 return 0;
 616         }
 617
 618         return nla_nest_end(skb, mx);
 619
 620 nla_put_failure:
 621         nla_nest_cancel(skb, mx);
 622         return -EMSGSIZE;
 623 }
 624 EXPORT_SYMBOL(rtnetlink_put_metrics);
 625
 626 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 627                        u32 ts, u32 tsage, long expires, u32 error)
 628 {
 629         struct rta_cacheinfo ci = {
 630                 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
 631                 .rta_used = dst->__use,
 632                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 633                 .rta_error = error,
 634                 .rta_id =  id,
 635                 .rta_ts = ts,
 636                 .rta_tsage = tsage,
 637         };
 638
 639         if (expires)
 640                 ci.rta_expires = jiffies_to_clock_t(expires);
 641
 642         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 643 }
 644 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 645
 646 static void set_operstate(struct net_device *dev, unsigned char transition)
 647 {
 648         unsigned char operstate = dev->operstate;
 649
 650         switch (transition) {
 651         case IF_OPER_UP:
 652                 if ((operstate == IF_OPER_DORMANT ||
 653                      operstate == IF_OPER_UNKNOWN) &&
 654                     !netif_dormant(dev))
 655                         operstate = IF_OPER_UP;
 656                 break;
 657
 658         case IF_OPER_DORMANT:
 659                 if (operstate == IF_OPER_UP ||
 660                     operstate == IF_OPER_UNKNOWN)
 661                         operstate = IF_OPER_DORMANT;
 662                 break;
 663         }
 664
 665         if (dev->operstate != operstate) {
 666                 write_lock_bh(&dev_base_lock);
 667                 dev->operstate = operstate;
 668                 write_unlock_bh(&dev_base_lock);
 669                 netdev_state_change(dev);
 670         }
 671 }
 672
 673 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 674                                            const struct ifinfomsg *ifm)
 675 {
 676         unsigned int flags = ifm->ifi_flags;
 677
 678         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 679         if (ifm->ifi_change)
 680                 flags = (flags & ifm->ifi_change) |
 681                         (dev->flags & ~ifm->ifi_change);
 682
 683         return flags;
 684 }
 685
 686 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 687                                  const struct rtnl_link_stats64 *b)
 688 {
 689         a->rx_packets = b->rx_packets;
 690         a->tx_packets = b->tx_packets;
 691         a->rx_bytes = b->rx_bytes;
 692         a->tx_bytes = b->tx_bytes;
 693         a->rx_errors = b->rx_errors;
 694         a->tx_errors = b->tx_errors;
 695         a->rx_dropped = b->rx_dropped;
 696         a->tx_dropped = b->tx_dropped;
 697
 698         a->multicast = b->multicast;
 699         a->collisions = b->collisions;
 700
 701         a->rx_length_errors = b->rx_length_errors;
 702         a->rx_over_errors = b->rx_over_errors;
 703         a->rx_crc_errors = b->rx_crc_errors;
 704         a->rx_frame_errors = b->rx_frame_errors;
 705         a->rx_fifo_errors = b->rx_fifo_errors;
 706         a->rx_missed_errors = b->rx_missed_errors;
 707
 708         a->tx_aborted_errors = b->tx_aborted_errors;
 709         a->tx_carrier_errors = b->tx_carrier_errors;
 710         a->tx_fifo_errors = b->tx_fifo_errors;
 711         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 712         a->tx_window_errors = b->tx_window_errors;
 713
 714         a->rx_compressed = b->rx_compressed;
 715         a->tx_compressed = b->tx_compressed;
 716 }
 717
 718 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
 719 {
 720         memcpy(v, b, sizeof(*b));
 721 }
 722
 723 /* All VF info */
 724 static inline int rtnl_vfinfo_size(const struct net_device *dev)
 725 {
 726         if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
 727
 728                 int num_vfs = dev_num_vf(dev->dev.parent);
 729                 size_t size = nla_total_size(sizeof(struct nlattr));
 730                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 731                 size += num_vfs *
 732                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 733                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 734                          nla_total_size(sizeof(struct ifla_vf_tx_rate)));
 735                 return size;
 736         } else
 737                 return 0;
 738 }
 739
 740 static size_t rtnl_port_size(const struct net_device *dev)
 741 {
 742         size_t port_size = nla_total_size(4)            /* PORT_VF */
 743                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 744                 + nla_total_size(sizeof(struct ifla_port_vsi))
 745                                                         /* PORT_VSI_TYPE */
 746                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 747                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 748                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 749                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 750         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 751         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 752                 + port_size;
 753         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 754                 + port_size;
 755
 756         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 757                 return 0;
 758         if (dev_num_vf(dev->dev.parent))
 759                 return port_self_size + vf_ports_size +
 760                         vf_port_size * dev_num_vf(dev->dev.parent);
 761         else
 762                 return port_self_size;
 763 }
 764
 765 static noinline size_t if_nlmsg_size(const struct net_device *dev)
 766 {
 767         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 768                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 769                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 770                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 771                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 772                + nla_total_size(sizeof(struct rtnl_link_stats))
 773                + nla_total_size(sizeof(struct rtnl_link_stats64))
 774                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 775                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 776                + nla_total_size(4) /* IFLA_TXQLEN */
 777                + nla_total_size(4) /* IFLA_WEIGHT */
 778                + nla_total_size(4) /* IFLA_MTU */
 779                + nla_total_size(4) /* IFLA_LINK */
 780                + nla_total_size(4) /* IFLA_MASTER */
 781                + nla_total_size(1) /* IFLA_OPERSTATE */
 782                + nla_total_size(1) /* IFLA_LINKMODE */
 783                + nla_total_size(4) /* IFLA_NUM_VF */
 784                + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
 785                + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 786                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 787                + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
 788 }
 789
 790 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 791 {
 792         struct nlattr *vf_ports;
 793         struct nlattr *vf_port;
 794         int vf;
 795         int err;
 796
 797         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 798         if (!vf_ports)
 799                 return -EMSGSIZE;
 800
 801         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 802                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 803                 if (!vf_port)
 804                         goto nla_put_failure;
 805                 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
 806                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 807                 if (err == -EMSGSIZE)
 808                         goto nla_put_failure;
 809                 if (err) {
 810                         nla_nest_cancel(skb, vf_port);
 811                         continue;
 812                 }
 813                 nla_nest_end(skb, vf_port);
 814         }
 815
 816         nla_nest_end(skb, vf_ports);
 817
 818         return 0;
 819
 820 nla_put_failure:
 821         nla_nest_cancel(skb, vf_ports);
 822         return -EMSGSIZE;
 823 }
 824
 825 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 826 {
 827         struct nlattr *port_self;
 828         int err;
 829
 830         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 831         if (!port_self)
 832                 return -EMSGSIZE;
 833
 834         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 835         if (err) {
 836                 nla_nest_cancel(skb, port_self);
 837                 return (err == -EMSGSIZE) ? err : 0;
 838         }
 839
 840         nla_nest_end(skb, port_self);
 841
 842         return 0;
 843 }
 844
 845 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
 846 {
 847         int err;
 848
 849         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 850                 return 0;
 851
 852         err = rtnl_port_self_fill(skb, dev);
 853         if (err)
 854                 return err;
 855
 856         if (dev_num_vf(dev->dev.parent)) {
 857                 err = rtnl_vf_ports_fill(skb, dev);
 858                 if (err)
 859                         return err;
 860         }
 861
 862         return 0;
 863 }
 864
 865 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 866                             int type, u32 pid, u32 seq, u32 change,
 867                             unsigned int flags)
 868 {
 869         struct ifinfomsg *ifm;
 870         struct nlmsghdr *nlh;
 871         struct rtnl_link_stats64 temp;
 872         const struct rtnl_link_stats64 *stats;
 873         struct nlattr *attr, *af_spec;
 874         struct rtnl_af_ops *af_ops;
 875
 876         ASSERT_RTNL();
 877         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 878         if (nlh == NULL)
 879                 return -EMSGSIZE;
 880
 881         ifm = nlmsg_data(nlh);
 882         ifm->ifi_family = AF_UNSPEC;
 883         ifm->__ifi_pad = 0;
 884         ifm->ifi_type = dev->type;
 885         ifm->ifi_index = dev->ifindex;
 886         ifm->ifi_flags = dev_get_flags(dev);
 887         ifm->ifi_change = change;
 888
 889         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 890         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
 891         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 892                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
 893         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
 894         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
 895         NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
 896
 897         if (dev->ifindex != dev->iflink)
 898                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 899
 900         if (dev->master)
 901                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
 902
 903         if (dev->qdisc)
 904                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
 905
 906         if (dev->ifalias)
 907                 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
 908
 909         if (1) {
 910                 struct rtnl_link_ifmap map = {
 911                         .mem_start   = dev->mem_start,
 912                         .mem_end     = dev->mem_end,
 913                         .base_addr   = dev->base_addr,
 914                         .irq         = dev->irq,
 915                         .dma         = dev->dma,
 916                         .port        = dev->if_port,
 917                 };
 918                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 919         }
 920
 921         if (dev->addr_len) {
 922                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 923                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 924         }
 925
 926         attr = nla_reserve(skb, IFLA_STATS,
 927                         sizeof(struct rtnl_link_stats));
 928         if (attr == NULL)
 929                 goto nla_put_failure;
 930
 931         stats = dev_get_stats(dev, &temp);
 932         copy_rtnl_link_stats(nla_data(attr), stats);
 933
 934         attr = nla_reserve(skb, IFLA_STATS64,
 935                         sizeof(struct rtnl_link_stats64));
 936         if (attr == NULL)
 937                 goto nla_put_failure;
 938         copy_rtnl_link_stats64(nla_data(attr), stats);
 939
 940         if (dev->dev.parent)
 941                 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
 942
 943         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
 944                 int i;
 945
 946                 struct nlattr *vfinfo, *vf;
 947                 int num_vfs = dev_num_vf(dev->dev.parent);
 948
 949                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
 950                 if (!vfinfo)
 951                         goto nla_put_failure;
 952                 for (i = 0; i < num_vfs; i++) {
 953                         struct ifla_vf_info ivi;
 954                         struct ifla_vf_mac vf_mac;
 955                         struct ifla_vf_vlan vf_vlan;
 956                         struct ifla_vf_tx_rate vf_tx_rate;
 957                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
 958                                 break;
 959                         vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
 960                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
 961                         vf_vlan.vlan = ivi.vlan;
 962                         vf_vlan.qos = ivi.qos;
 963                         vf_tx_rate.rate = ivi.tx_rate;
 964                         vf = nla_nest_start(skb, IFLA_VF_INFO);
 965                         if (!vf) {
 966                                 nla_nest_cancel(skb, vfinfo);
 967                                 goto nla_put_failure;
 968                         }
 969                         NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
 970                         NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
 971                         NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
 972                         nla_nest_end(skb, vf);
 973                 }
 974                 nla_nest_end(skb, vfinfo);
 975         }
 976
 977         if (rtnl_port_fill(skb, dev))
 978                 goto nla_put_failure;
 979
 980         if (dev->rtnl_link_ops) {
 981                 if (rtnl_link_fill(skb, dev) < 0)
 982                         goto nla_put_failure;
 983         }
 984
 985         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
 986                 goto nla_put_failure;
 987
 988         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 989                 if (af_ops->fill_link_af) {
 990                         struct nlattr *af;
 991                         int err;
 992
 993                         if (!(af = nla_nest_start(skb, af_ops->family)))
 994                                 goto nla_put_failure;
 995
 996                         err = af_ops->fill_link_af(skb, dev);
 997
 998                         /*
 999                          * Caller may return ENODATA to indicate that there
1000                          * was no data to be dumped. This is not an error, it
1001                          * means we should trim the attribute header and
1002                          * continue.
1003                          */
1004                         if (err == -ENODATA)
1005                                 nla_nest_cancel(skb, af);
1006                         else if (err < 0)
1007                                 goto nla_put_failure;
1008
1009                         nla_nest_end(skb, af);
1010                 }
1011         }
1012
1013         nla_nest_end(skb, af_spec);
1014
1015         return nlmsg_end(skb, nlh);
1016
1017 nla_put_failure:
1018         nlmsg_cancel(skb, nlh);
1019         return -EMSGSIZE;
1020 }
1021
1022 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1023 {
1024         struct net *net = sock_net(skb->sk);
1025         int h, s_h;
1026         int idx = 0, s_idx;
1027         struct net_device *dev;
1028         struct hlist_head *head;
1029         struct hlist_node *node;
1030
1031         s_h = cb->args[0];
1032         s_idx = cb->args[1];
1033
1034         rcu_read_lock();
1035         cb->seq = net->dev_base_seq;
1036
1037         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1038                 idx = 0;
1039                 head = &net->dev_index_head[h];
1040                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1041                         if (idx < s_idx)
1042                                 goto cont;
1043                         if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1044                                              NETLINK_CB(cb->skb).pid,
1045                                              cb->nlh->nlmsg_seq, 0,
1046                                              NLM_F_MULTI) <= 0)
1047                                 goto out;
1048
1049                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1050 cont:
1051                         idx++;
1052                 }
1053         }
1054 out:
1055         rcu_read_unlock();
1056         cb->args[1] = idx;
1057         cb->args[0] = h;
1058
1059         return skb->len;
1060 }
1061
1062 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1063         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1064         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1065         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1066         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1067         [IFLA_MTU]              = { .type = NLA_U32 },
1068         [IFLA_LINK]             = { .type = NLA_U32 },
1069         [IFLA_MASTER]           = { .type = NLA_U32 },
1070         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1071         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1072         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1073         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1074         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1075         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1076         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1077         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1078         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1079         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1080         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1081         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1082 };
1083 EXPORT_SYMBOL(ifla_policy);
1084
1085 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1086         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1087         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1088 };
1089
1090 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1091         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1092 };
1093
1094 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1095         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1096                                     .len = sizeof(struct ifla_vf_mac) },
1097         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1098                                     .len = sizeof(struct ifla_vf_vlan) },
1099         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1100                                     .len = sizeof(struct ifla_vf_tx_rate) },
1101 };
1102
1103 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1104         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1105         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1106                                     .len = PORT_PROFILE_MAX },
1107         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1108                                     .len = sizeof(struct ifla_port_vsi)},
1109         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1110                                       .len = PORT_UUID_MAX },
1111         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1112                                     .len = PORT_UUID_MAX },
1113         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1114         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1115 };
1116
1117 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1118 {
1119         struct net *net;
1120         /* Examine the link attributes and figure out which
1121          * network namespace we are talking about.
1122          */
1123         if (tb[IFLA_NET_NS_PID])
1124                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1125         else if (tb[IFLA_NET_NS_FD])
1126                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1127         else
1128                 net = get_net(src_net);
1129         return net;
1130 }
1131 EXPORT_SYMBOL(rtnl_link_get_net);
1132
1133 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1134 {
1135         if (dev) {
1136                 if (tb[IFLA_ADDRESS] &&
1137                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1138                         return -EINVAL;
1139
1140                 if (tb[IFLA_BROADCAST] &&
1141                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1142                         return -EINVAL;
1143         }
1144
1145         if (tb[IFLA_AF_SPEC]) {
1146                 struct nlattr *af;
1147                 int rem, err;
1148
1149                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1150                         const struct rtnl_af_ops *af_ops;
1151
1152                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1153                                 return -EAFNOSUPPORT;
1154
1155                         if (!af_ops->set_link_af)
1156                                 return -EOPNOTSUPP;
1157
1158                         if (af_ops->validate_link_af) {
1159                                 err = af_ops->validate_link_af(dev, af);
1160                                 if (err < 0)
1161                                         return err;
1162                         }
1163                 }
1164         }
1165
1166         return 0;
1167 }
1168
1169 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1170 {
1171         int rem, err = -EINVAL;
1172         struct nlattr *vf;
1173         const struct net_device_ops *ops = dev->netdev_ops;
1174
1175         nla_for_each_nested(vf, attr, rem) {
1176                 switch (nla_type(vf)) {
1177                 case IFLA_VF_MAC: {
1178                         struct ifla_vf_mac *ivm;
1179                         ivm = nla_data(vf);
1180                         err = -EOPNOTSUPP;
1181                         if (ops->ndo_set_vf_mac)
1182                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1183                                                           ivm->mac);
1184                         break;
1185                 }
1186                 case IFLA_VF_VLAN: {
1187                         struct ifla_vf_vlan *ivv;
1188                         ivv = nla_data(vf);
1189                         err = -EOPNOTSUPP;
1190                         if (ops->ndo_set_vf_vlan)
1191                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1192                                                            ivv->vlan,
1193                                                            ivv->qos);
1194                         break;
1195                 }
1196                 case IFLA_VF_TX_RATE: {
1197                         struct ifla_vf_tx_rate *ivt;
1198                         ivt = nla_data(vf);
1199                         err = -EOPNOTSUPP;
1200                         if (ops->ndo_set_vf_tx_rate)
1201                                 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1202                                                               ivt->rate);
1203                         break;
1204                 }
1205                 default:
1206                         err = -EINVAL;
1207                         break;
1208                 }
1209                 if (err)
1210                         break;
1211         }
1212         return err;
1213 }
1214
1215 static int do_set_master(struct net_device *dev, int ifindex)
1216 {
1217         struct net_device *master_dev;
1218         const struct net_device_ops *ops;
1219         int err;
1220
1221         if (dev->master) {
1222                 if (dev->master->ifindex == ifindex)
1223                         return 0;
1224                 ops = dev->master->netdev_ops;
1225                 if (ops->ndo_del_slave) {
1226                         err = ops->ndo_del_slave(dev->master, dev);
1227                         if (err)
1228                                 return err;
1229                 } else {
1230                         return -EOPNOTSUPP;
1231                 }
1232         }
1233
1234         if (ifindex) {
1235                 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1236                 if (!master_dev)
1237                         return -EINVAL;
1238                 ops = master_dev->netdev_ops;
1239                 if (ops->ndo_add_slave) {
1240                         err = ops->ndo_add_slave(master_dev, dev);
1241                         if (err)
1242                                 return err;
1243                 } else {
1244                         return -EOPNOTSUPP;
1245                 }
1246         }
1247         return 0;
1248 }
1249
1250 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1251                       struct nlattr **tb, char *ifname, int modified)
1252 {
1253         const struct net_device_ops *ops = dev->netdev_ops;
1254         int send_addr_notify = 0;
1255         int err;
1256
1257         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1258                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1259                 if (IS_ERR(net)) {
1260                         err = PTR_ERR(net);
1261                         goto errout;
1262                 }
1263                 err = dev_change_net_namespace(dev, net, ifname);
1264                 put_net(net);
1265                 if (err)
1266                         goto errout;
1267                 modified = 1;
1268         }
1269
1270         if (tb[IFLA_MAP]) {
1271                 struct rtnl_link_ifmap *u_map;
1272                 struct ifmap k_map;
1273
1274                 if (!ops->ndo_set_config) {
1275                         err = -EOPNOTSUPP;
1276                         goto errout;
1277                 }
1278
1279                 if (!netif_device_present(dev)) {
1280                         err = -ENODEV;
1281                         goto errout;
1282                 }
1283
1284                 u_map = nla_data(tb[IFLA_MAP]);
1285                 k_map.mem_start = (unsigned long) u_map->mem_start;
1286                 k_map.mem_end = (unsigned long) u_map->mem_end;
1287                 k_map.base_addr = (unsigned short) u_map->base_addr;
1288                 k_map.irq = (unsigned char) u_map->irq;
1289                 k_map.dma = (unsigned char) u_map->dma;
1290                 k_map.port = (unsigned char) u_map->port;
1291
1292                 err = ops->ndo_set_config(dev, &k_map);
1293                 if (err < 0)
1294                         goto errout;
1295
1296                 modified = 1;
1297         }
1298
1299         if (tb[IFLA_ADDRESS]) {
1300                 struct sockaddr *sa;
1301                 int len;
1302
1303                 if (!ops->ndo_set_mac_address) {
1304                         err = -EOPNOTSUPP;
1305                         goto errout;
1306                 }
1307
1308                 if (!netif_device_present(dev)) {
1309                         err = -ENODEV;
1310                         goto errout;
1311                 }
1312
1313                 len = sizeof(sa_family_t) + dev->addr_len;
1314                 sa = kmalloc(len, GFP_KERNEL);
1315                 if (!sa) {
1316                         err = -ENOMEM;
1317                         goto errout;
1318                 }
1319                 sa->sa_family = dev->type;
1320                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1321                        dev->addr_len);
1322                 err = ops->ndo_set_mac_address(dev, sa);
1323                 kfree(sa);
1324                 if (err)
1325                         goto errout;
1326                 send_addr_notify = 1;
1327                 modified = 1;
1328         }
1329
1330         if (tb[IFLA_MTU]) {
1331                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1332                 if (err < 0)
1333                         goto errout;
1334                 modified = 1;
1335         }
1336
1337         if (tb[IFLA_GROUP]) {
1338                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1339                 modified = 1;
1340         }
1341
1342         /*
1343          * Interface selected by interface index but interface
1344          * name provided implies that a name change has been
1345          * requested.
1346          */
1347         if (ifm->ifi_index > 0 && ifname[0]) {
1348                 err = dev_change_name(dev, ifname);
1349                 if (err < 0)
1350                         goto errout;
1351                 modified = 1;
1352         }
1353
1354         if (tb[IFLA_IFALIAS]) {
1355                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1356                                     nla_len(tb[IFLA_IFALIAS]));
1357                 if (err < 0)
1358                         goto errout;
1359                 modified = 1;
1360         }
1361
1362         if (tb[IFLA_BROADCAST]) {
1363                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1364                 send_addr_notify = 1;
1365         }
1366
1367         if (ifm->ifi_flags || ifm->ifi_change) {
1368                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1369                 if (err < 0)
1370                         goto errout;
1371         }
1372
1373         if (tb[IFLA_MASTER]) {
1374                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1375                 if (err)
1376                         goto errout;
1377                 modified = 1;
1378         }
1379
1380         if (tb[IFLA_TXQLEN])
1381                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1382
1383         if (tb[IFLA_OPERSTATE])
1384                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1385
1386         if (tb[IFLA_LINKMODE]) {
1387                 write_lock_bh(&dev_base_lock);
1388                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1389                 write_unlock_bh(&dev_base_lock);
1390         }
1391
1392         if (tb[IFLA_VFINFO_LIST]) {
1393                 struct nlattr *attr;
1394                 int rem;
1395                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1396                         if (nla_type(attr) != IFLA_VF_INFO) {
1397                                 err = -EINVAL;
1398                                 goto errout;
1399                         }
1400                         err = do_setvfinfo(dev, attr);
1401                         if (err < 0)
1402                                 goto errout;
1403                         modified = 1;
1404                 }
1405         }
1406         err = 0;
1407
1408         if (tb[IFLA_VF_PORTS]) {
1409                 struct nlattr *port[IFLA_PORT_MAX+1];
1410                 struct nlattr *attr;
1411                 int vf;
1412                 int rem;
1413
1414                 err = -EOPNOTSUPP;
1415                 if (!ops->ndo_set_vf_port)
1416                         goto errout;
1417
1418                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1419                         if (nla_type(attr) != IFLA_VF_PORT)
1420                                 continue;
1421                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1422                                 attr, ifla_port_policy);
1423                         if (err < 0)
1424                                 goto errout;
1425                         if (!port[IFLA_PORT_VF]) {
1426                                 err = -EOPNOTSUPP;
1427                                 goto errout;
1428                         }
1429                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1430                         err = ops->ndo_set_vf_port(dev, vf, port);
1431                         if (err < 0)
1432                                 goto errout;
1433                         modified = 1;
1434                 }
1435         }
1436         err = 0;
1437
1438         if (tb[IFLA_PORT_SELF]) {
1439                 struct nlattr *port[IFLA_PORT_MAX+1];
1440
1441                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1442                         tb[IFLA_PORT_SELF], ifla_port_policy);
1443                 if (err < 0)
1444                         goto errout;
1445
1446                 err = -EOPNOTSUPP;
1447                 if (ops->ndo_set_vf_port)
1448                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1449                 if (err < 0)
1450                         goto errout;
1451                 modified = 1;
1452         }
1453
1454         if (tb[IFLA_AF_SPEC]) {
1455                 struct nlattr *af;
1456                 int rem;
1457
1458                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1459                         const struct rtnl_af_ops *af_ops;
1460
1461                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1462                                 BUG();
1463
1464                         err = af_ops->set_link_af(dev, af);
1465                         if (err < 0)
1466                                 goto errout;
1467
1468                         modified = 1;
1469                 }
1470         }
1471         err = 0;
1472
1473 errout:
1474         if (err < 0 && modified && net_ratelimit())
1475                 printk(KERN_WARNING "A link change request failed with "
1476                        "some changes committed already. Interface %s may "
1477                        "have been left with an inconsistent configuration, "
1478                        "please check.\n", dev->name);
1479
1480         if (send_addr_notify)
1481                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1482         return err;
1483 }
1484
1485 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1486 {
1487         struct net *net = sock_net(skb->sk);
1488         struct ifinfomsg *ifm;
1489         struct net_device *dev;
1490         int err;
1491         struct nlattr *tb[IFLA_MAX+1];
1492         char ifname[IFNAMSIZ];
1493
1494         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1495         if (err < 0)
1496                 goto errout;
1497
1498         if (tb[IFLA_IFNAME])
1499                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1500         else
1501                 ifname[0] = '\0';
1502
1503         err = -EINVAL;
1504         ifm = nlmsg_data(nlh);
1505         if (ifm->ifi_index > 0)
1506                 dev = __dev_get_by_index(net, ifm->ifi_index);
1507         else if (tb[IFLA_IFNAME])
1508                 dev = __dev_get_by_name(net, ifname);
1509         else
1510                 goto errout;
1511
1512         if (dev == NULL) {
1513                 err = -ENODEV;
1514                 goto errout;
1515         }
1516
1517         err = validate_linkmsg(dev, tb);
1518         if (err < 0)
1519                 goto errout;
1520
1521         err = do_setlink(dev, ifm, tb, ifname, 0);
1522 errout:
1523         return err;
1524 }
1525
1526 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1527 {
1528         struct net *net = sock_net(skb->sk);
1529         const struct rtnl_link_ops *ops;
1530         struct net_device *dev;
1531         struct ifinfomsg *ifm;
1532         char ifname[IFNAMSIZ];
1533         struct nlattr *tb[IFLA_MAX+1];
1534         int err;
1535         LIST_HEAD(list_kill);
1536
1537         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1538         if (err < 0)
1539                 return err;
1540
1541         if (tb[IFLA_IFNAME])
1542                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1543
1544         ifm = nlmsg_data(nlh);
1545         if (ifm->ifi_index > 0)
1546                 dev = __dev_get_by_index(net, ifm->ifi_index);
1547         else if (tb[IFLA_IFNAME])
1548                 dev = __dev_get_by_name(net, ifname);
1549         else
1550                 return -EINVAL;
1551
1552         if (!dev)
1553                 return -ENODEV;
1554
1555         ops = dev->rtnl_link_ops;
1556         if (!ops)
1557                 return -EOPNOTSUPP;
1558
1559         ops->dellink(dev, &list_kill);
1560         unregister_netdevice_many(&list_kill);
1561         list_del(&list_kill);
1562         return 0;
1563 }
1564
1565 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1566 {
1567         unsigned int old_flags;
1568         int err;
1569
1570         old_flags = dev->flags;
1571         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1572                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1573                 if (err < 0)
1574                         return err;
1575         }
1576
1577         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1578         rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1579
1580         __dev_notify_flags(dev, old_flags);
1581         return 0;
1582 }
1583 EXPORT_SYMBOL(rtnl_configure_link);
1584
1585 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1586         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1587 {
1588         int err;
1589         struct net_device *dev;
1590         unsigned int num_queues = 1;
1591         unsigned int real_num_queues = 1;
1592
1593         if (ops->get_tx_queues) {
1594                 err = ops->get_tx_queues(src_net, tb, &num_queues,
1595                                          &real_num_queues);
1596                 if (err)
1597                         goto err;
1598         }
1599         err = -ENOMEM;
1600         dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1601         if (!dev)
1602                 goto err;
1603
1604         dev_net_set(dev, net);
1605         dev->rtnl_link_ops = ops;
1606         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1607         dev->real_num_tx_queues = real_num_queues;
1608
1609         if (tb[IFLA_MTU])
1610                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1611         if (tb[IFLA_ADDRESS])
1612                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1613                                 nla_len(tb[IFLA_ADDRESS]));
1614         if (tb[IFLA_BROADCAST])
1615                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1616                                 nla_len(tb[IFLA_BROADCAST]));
1617         if (tb[IFLA_TXQLEN])
1618                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1619         if (tb[IFLA_OPERSTATE])
1620                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1621         if (tb[IFLA_LINKMODE])
1622                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1623         if (tb[IFLA_GROUP])
1624                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1625
1626         return dev;
1627
1628 err:
1629         return ERR_PTR(err);
1630 }
1631 EXPORT_SYMBOL(rtnl_create_link);
1632
1633 static int rtnl_group_changelink(struct net *net, int group,
1634                 struct ifinfomsg *ifm,
1635                 struct nlattr **tb)
1636 {
1637         struct net_device *dev;
1638         int err;
1639
1640         for_each_netdev(net, dev) {
1641                 if (dev->group == group) {
1642                         err = do_setlink(dev, ifm, tb, NULL, 0);
1643                         if (err < 0)
1644                                 return err;
1645                 }
1646         }
1647
1648         return 0;
1649 }
1650
1651 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1652 {
1653         struct net *net = sock_net(skb->sk);
1654         const struct rtnl_link_ops *ops;
1655         struct net_device *dev;
1656         struct ifinfomsg *ifm;
1657         char kind[MODULE_NAME_LEN];
1658         char ifname[IFNAMSIZ];
1659         struct nlattr *tb[IFLA_MAX+1];
1660         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1661         int err;
1662
1663 #ifdef CONFIG_MODULES
1664 replay:
1665 #endif
1666         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1667         if (err < 0)
1668                 return err;
1669
1670         if (tb[IFLA_IFNAME])
1671                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1672         else
1673                 ifname[0] = '\0';
1674
1675         ifm = nlmsg_data(nlh);
1676         if (ifm->ifi_index > 0)
1677                 dev = __dev_get_by_index(net, ifm->ifi_index);
1678         else {
1679                 if (ifname[0])
1680                         dev = __dev_get_by_name(net, ifname);
1681                 else
1682                         dev = NULL;
1683         }
1684
1685         err = validate_linkmsg(dev, tb);
1686         if (err < 0)
1687                 return err;
1688
1689         if (tb[IFLA_LINKINFO]) {
1690                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1691                                        tb[IFLA_LINKINFO], ifla_info_policy);
1692                 if (err < 0)
1693                         return err;
1694         } else
1695                 memset(linkinfo, 0, sizeof(linkinfo));
1696
1697         if (linkinfo[IFLA_INFO_KIND]) {
1698                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1699                 ops = rtnl_link_ops_get(kind);
1700         } else {
1701                 kind[0] = '\0';
1702                 ops = NULL;
1703         }
1704
1705         if (1) {
1706                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1707                 struct net *dest_net;
1708
1709                 if (ops) {
1710                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1711                                 err = nla_parse_nested(attr, ops->maxtype,
1712                                                        linkinfo[IFLA_INFO_DATA],
1713                                                        ops->policy);
1714                                 if (err < 0)
1715                                         return err;
1716                                 data = attr;
1717                         }
1718                         if (ops->validate) {
1719                                 err = ops->validate(tb, data);
1720                                 if (err < 0)
1721                                         return err;
1722                         }
1723                 }
1724
1725                 if (dev) {
1726                         int modified = 0;
1727
1728                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1729                                 return -EEXIST;
1730                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1731                                 return -EOPNOTSUPP;
1732
1733                         if (linkinfo[IFLA_INFO_DATA]) {
1734                                 if (!ops || ops != dev->rtnl_link_ops ||
1735                                     !ops->changelink)
1736                                         return -EOPNOTSUPP;
1737
1738                                 err = ops->changelink(dev, tb, data);
1739                                 if (err < 0)
1740                                         return err;
1741                                 modified = 1;
1742                         }
1743
1744                         return do_setlink(dev, ifm, tb, ifname, modified);
1745                 }
1746
1747                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1748                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1749                                 return rtnl_group_changelink(net,
1750                                                 nla_get_u32(tb[IFLA_GROUP]),
1751                                                 ifm, tb);
1752                         return -ENODEV;
1753                 }
1754
1755                 if (ifm->ifi_index)
1756                         return -EOPNOTSUPP;
1757                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1758                         return -EOPNOTSUPP;
1759
1760                 if (!ops) {
1761 #ifdef CONFIG_MODULES
1762                         if (kind[0]) {
1763                                 __rtnl_unlock();
1764                                 request_module("rtnl-link-%s", kind);
1765                                 rtnl_lock();
1766                                 ops = rtnl_link_ops_get(kind);
1767                                 if (ops)
1768                                         goto replay;
1769                         }
1770 #endif
1771                         return -EOPNOTSUPP;
1772                 }
1773
1774                 if (!ifname[0])
1775                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1776
1777                 dest_net = rtnl_link_get_net(net, tb);
1778                 if (IS_ERR(dest_net))
1779                         return PTR_ERR(dest_net);
1780
1781                 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1782
1783                 if (IS_ERR(dev))
1784                         err = PTR_ERR(dev);
1785                 else if (ops->newlink)
1786                         err = ops->newlink(net, dev, tb, data);
1787                 else
1788                         err = register_netdevice(dev);
1789
1790                 if (err < 0 && !IS_ERR(dev))
1791                         free_netdev(dev);
1792                 if (err < 0)
1793                         goto out;
1794
1795                 err = rtnl_configure_link(dev, ifm);
1796                 if (err < 0)
1797                         unregister_netdevice(dev);
1798 out:
1799                 put_net(dest_net);
1800                 return err;
1801         }
1802 }
1803
1804 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1805 {
1806         struct net *net = sock_net(skb->sk);
1807         struct ifinfomsg *ifm;
1808         char ifname[IFNAMSIZ];
1809         struct nlattr *tb[IFLA_MAX+1];
1810         struct net_device *dev = NULL;
1811         struct sk_buff *nskb;
1812         int err;
1813
1814         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1815         if (err < 0)
1816                 return err;
1817
1818         if (tb[IFLA_IFNAME])
1819                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1820
1821         ifm = nlmsg_data(nlh);
1822         if (ifm->ifi_index > 0)
1823                 dev = __dev_get_by_index(net, ifm->ifi_index);
1824         else if (tb[IFLA_IFNAME])
1825                 dev = __dev_get_by_name(net, ifname);
1826         else
1827                 return -EINVAL;
1828
1829         if (dev == NULL)
1830                 return -ENODEV;
1831
1832         nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1833         if (nskb == NULL)
1834                 return -ENOBUFS;
1835
1836         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1837                                nlh->nlmsg_seq, 0, 0);
1838         if (err < 0) {
1839                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1840                 WARN_ON(err == -EMSGSIZE);
1841                 kfree_skb(nskb);
1842         } else
1843                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1844
1845         return err;
1846 }
1847
1848 static u16 rtnl_calcit(struct sk_buff *skb)
1849 {
1850         return min_ifinfo_dump_size;
1851 }
1852
1853 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1854 {
1855         int idx;
1856         int s_idx = cb->family;
1857
1858         if (s_idx == 0)
1859                 s_idx = 1;
1860         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1861                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1862                 if (idx < s_idx || idx == PF_PACKET)
1863                         continue;
1864                 if (rtnl_msg_handlers[idx] == NULL ||
1865                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1866                         continue;
1867                 if (idx > s_idx)
1868                         memset(&cb->args[0], 0, sizeof(cb->args));
1869                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1870                         break;
1871         }
1872         cb->family = idx;
1873
1874         return skb->len;
1875 }
1876
1877 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1878 {
1879         struct net *net = dev_net(dev);
1880         struct sk_buff *skb;
1881         int err = -ENOBUFS;
1882         size_t if_info_size;
1883
1884         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev)), GFP_KERNEL);
1885         if (skb == NULL)
1886                 goto errout;
1887
1888         min_ifinfo_dump_size = max_t(u16, if_info_size, min_ifinfo_dump_size);
1889
1890         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1891         if (err < 0) {
1892                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1893                 WARN_ON(err == -EMSGSIZE);
1894                 kfree_skb(skb);
1895                 goto errout;
1896         }
1897         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1898         return;
1899 errout:
1900         if (err < 0)
1901                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1902 }
1903
1904 /* Protected by RTNL sempahore.  */
1905 static struct rtattr **rta_buf;
1906 static int rtattr_max;
1907
1908 /* Process one rtnetlink message. */
1909
1910 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1911 {
1912         struct net *net = sock_net(skb->sk);
1913         rtnl_doit_func doit;
1914         int sz_idx, kind;
1915         int min_len;
1916         int family;
1917         int type;
1918         int err;
1919
1920         type = nlh->nlmsg_type;
1921         if (type > RTM_MAX)
1922                 return -EOPNOTSUPP;
1923
1924         type -= RTM_BASE;
1925
1926         /* All the messages must have at least 1 byte length */
1927         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1928                 return 0;
1929
1930         family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1931         sz_idx = type>>2;
1932         kind = type&3;
1933
1934         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1935                 return -EPERM;
1936
1937         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1938                 struct sock *rtnl;
1939                 rtnl_dumpit_func dumpit;
1940                 rtnl_calcit_func calcit;
1941                 u16 min_dump_alloc = 0;
1942
1943                 dumpit = rtnl_get_dumpit(family, type);
1944                 if (dumpit == NULL)
1945                         return -EOPNOTSUPP;
1946                 calcit = rtnl_get_calcit(family, type);
1947                 if (calcit)
1948                         min_dump_alloc = calcit(skb);
1949
1950                 __rtnl_unlock();
1951                 rtnl = net->rtnl;
1952                 err = netlink_dump_start(rtnl, skb, nlh, dumpit,
1953                                          NULL, min_dump_alloc);
1954                 rtnl_lock();
1955                 return err;
1956         }
1957
1958         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1959
1960         min_len = rtm_min[sz_idx];
1961         if (nlh->nlmsg_len < min_len)
1962                 return -EINVAL;
1963
1964         if (nlh->nlmsg_len > min_len) {
1965                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1966                 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1967
1968                 while (RTA_OK(attr, attrlen)) {
1969                         unsigned flavor = attr->rta_type;
1970                         if (flavor) {
1971                                 if (flavor > rta_max[sz_idx])
1972                                         return -EINVAL;
1973                                 rta_buf[flavor-1] = attr;
1974                         }
1975                         attr = RTA_NEXT(attr, attrlen);
1976                 }
1977         }
1978
1979         doit = rtnl_get_doit(family, type);
1980         if (doit == NULL)
1981                 return -EOPNOTSUPP;
1982
1983         return doit(skb, nlh, (void *)&rta_buf[0]);
1984 }
1985
1986 static void rtnetlink_rcv(struct sk_buff *skb)
1987 {
1988         rtnl_lock();
1989         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1990         rtnl_unlock();
1991 }
1992
1993 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1994 {
1995         struct net_device *dev = ptr;
1996
1997         switch (event) {
1998         case NETDEV_UP:
1999         case NETDEV_DOWN:
2000         case NETDEV_PRE_UP:
2001         case NETDEV_POST_INIT:
2002         case NETDEV_REGISTER:
2003         case NETDEV_CHANGE:
2004         case NETDEV_PRE_TYPE_CHANGE:
2005         case NETDEV_GOING_DOWN:
2006         case NETDEV_UNREGISTER:
2007         case NETDEV_UNREGISTER_BATCH:
2008         case NETDEV_RELEASE:
2009         case NETDEV_JOIN:
2010                 break;
2011         default:
2012                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2013                 break;
2014         }
2015         return NOTIFY_DONE;
2016 }
2017
2018 static struct notifier_block rtnetlink_dev_notifier = {
2019         .notifier_call  = rtnetlink_event,
2020 };
2021
2022
2023 static int __net_init rtnetlink_net_init(struct net *net)
2024 {
2025         struct sock *sk;
2026         sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2027                                    rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2028         if (!sk)
2029                 return -ENOMEM;
2030         net->rtnl = sk;
2031         return 0;
2032 }
2033
2034 static void __net_exit rtnetlink_net_exit(struct net *net)
2035 {
2036         netlink_kernel_release(net->rtnl);
2037         net->rtnl = NULL;
2038 }
2039
2040 static struct pernet_operations rtnetlink_net_ops = {
2041         .init = rtnetlink_net_init,
2042         .exit = rtnetlink_net_exit,
2043 };
2044
2045 void __init rtnetlink_init(void)
2046 {
2047         int i;
2048
2049         rtattr_max = 0;
2050         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2051                 if (rta_max[i] > rtattr_max)
2052                         rtattr_max = rta_max[i];
2053         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2054         if (!rta_buf)
2055                 panic("rtnetlink_init: cannot allocate rta_buf\n");
2056
2057         if (register_pernet_subsys(&rtnetlink_net_ops))
2058                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2059
2060         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2061         register_netdevice_notifier(&rtnetlink_dev_notifier);
2062
2063         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2064                       rtnl_dump_ifinfo, rtnl_calcit);
2065         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2066         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2067         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2068
2069         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2070         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2071 }
2072