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 };
  60
  61 static DEFINE_MUTEX(rtnl_mutex);
  62
  63 void rtnl_lock(void)
  64 {
  65         mutex_lock(&rtnl_mutex);
  66 }
  67 EXPORT_SYMBOL(rtnl_lock);
  68
  69 void __rtnl_unlock(void)
  70 {
  71         mutex_unlock(&rtnl_mutex);
  72 }
  73
  74 void rtnl_unlock(void)
  75 {
  76         /* This fellow will unlock it for us. */
  77         netdev_run_todo();
  78 }
  79 EXPORT_SYMBOL(rtnl_unlock);
  80
  81 int rtnl_trylock(void)
  82 {
  83         return mutex_trylock(&rtnl_mutex);
  84 }
  85 EXPORT_SYMBOL(rtnl_trylock);
  86
  87 int rtnl_is_locked(void)
  88 {
  89         return mutex_is_locked(&rtnl_mutex);
  90 }
  91 EXPORT_SYMBOL(rtnl_is_locked);
  92
  93 #ifdef CONFIG_PROVE_LOCKING
  94 int lockdep_rtnl_is_held(void)
  95 {
  96         return lockdep_is_held(&rtnl_mutex);
  97 }
  98 EXPORT_SYMBOL(lockdep_rtnl_is_held);
  99 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 100
 101 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 102
 103 static inline int rtm_msgindex(int msgtype)
 104 {
 105         int msgindex = msgtype - RTM_BASE;
 106
 107         /*
 108          * msgindex < 0 implies someone tried to register a netlink
 109          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 110          * the message type has not been added to linux/rtnetlink.h
 111          */
 112         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 113
 114         return msgindex;
 115 }
 116
 117 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
 118 {
 119         struct rtnl_link *tab;
 120
 121         if (protocol <= RTNL_FAMILY_MAX)
 122                 tab = rtnl_msg_handlers[protocol];
 123         else
 124                 tab = NULL;
 125
 126         if (tab == NULL || tab[msgindex].doit == NULL)
 127                 tab = rtnl_msg_handlers[PF_UNSPEC];
 128
 129         return tab ? tab[msgindex].doit : NULL;
 130 }
 131
 132 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
 133 {
 134         struct rtnl_link *tab;
 135
 136         if (protocol <= RTNL_FAMILY_MAX)
 137                 tab = rtnl_msg_handlers[protocol];
 138         else
 139                 tab = NULL;
 140
 141         if (tab == NULL || tab[msgindex].dumpit == NULL)
 142                 tab = rtnl_msg_handlers[PF_UNSPEC];
 143
 144         return tab ? tab[msgindex].dumpit : NULL;
 145 }
 146
 147 /**
 148  * __rtnl_register - Register a rtnetlink message type
 149  * @protocol: Protocol family or PF_UNSPEC
 150  * @msgtype: rtnetlink message type
 151  * @doit: Function pointer called for each request message
 152  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 153  *
 154  * Registers the specified function pointers (at least one of them has
 155  * to be non-NULL) to be called whenever a request message for the
 156  * specified protocol family and message type is received.
 157  *
 158  * The special protocol family PF_UNSPEC may be used to define fallback
 159  * function pointers for the case when no entry for the specific protocol
 160  * family exists.
 161  *
 162  * Returns 0 on success or a negative error code.
 163  */
 164 int __rtnl_register(int protocol, int msgtype,
 165                     rtnl_doit_func doit, rtnl_dumpit_func dumpit)
 166 {
 167         struct rtnl_link *tab;
 168         int msgindex;
 169
 170         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 171         msgindex = rtm_msgindex(msgtype);
 172
 173         tab = rtnl_msg_handlers[protocol];
 174         if (tab == NULL) {
 175                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 176                 if (tab == NULL)
 177                         return -ENOBUFS;
 178
 179                 rtnl_msg_handlers[protocol] = tab;
 180         }
 181
 182         if (doit)
 183                 tab[msgindex].doit = doit;
 184
 185         if (dumpit)
 186                 tab[msgindex].dumpit = dumpit;
 187
 188         return 0;
 189 }
 190 EXPORT_SYMBOL_GPL(__rtnl_register);
 191
 192 /**
 193  * rtnl_register - Register a rtnetlink message type
 194  *
 195  * Identical to __rtnl_register() but panics on failure. This is useful
 196  * as failure of this function is very unlikely, it can only happen due
 197  * to lack of memory when allocating the chain to store all message
 198  * handlers for a protocol. Meant for use in init functions where lack
 199  * of memory implies no sense in continueing.
 200  */
 201 void rtnl_register(int protocol, int msgtype,
 202                    rtnl_doit_func doit, rtnl_dumpit_func dumpit)
 203 {
 204         if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
 205                 panic("Unable to register rtnetlink message handler, "
 206                       "protocol = %d, message type = %d\n",
 207                       protocol, msgtype);
 208 }
 209 EXPORT_SYMBOL_GPL(rtnl_register);
 210
 211 /**
 212  * rtnl_unregister - Unregister a rtnetlink message type
 213  * @protocol: Protocol family or PF_UNSPEC
 214  * @msgtype: rtnetlink message type
 215  *
 216  * Returns 0 on success or a negative error code.
 217  */
 218 int rtnl_unregister(int protocol, int msgtype)
 219 {
 220         int msgindex;
 221
 222         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 223         msgindex = rtm_msgindex(msgtype);
 224
 225         if (rtnl_msg_handlers[protocol] == NULL)
 226                 return -ENOENT;
 227
 228         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 229         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
 230
 231         return 0;
 232 }
 233 EXPORT_SYMBOL_GPL(rtnl_unregister);
 234
 235 /**
 236  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 237  * @protocol : Protocol family or PF_UNSPEC
 238  *
 239  * Identical to calling rtnl_unregster() for all registered message types
 240  * of a certain protocol family.
 241  */
 242 void rtnl_unregister_all(int protocol)
 243 {
 244         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 245
 246         kfree(rtnl_msg_handlers[protocol]);
 247         rtnl_msg_handlers[protocol] = NULL;
 248 }
 249 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 250
 251 static LIST_HEAD(link_ops);
 252
 253 /**
 254  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 255  * @ops: struct rtnl_link_ops * to register
 256  *
 257  * The caller must hold the rtnl_mutex. This function should be used
 258  * by drivers that create devices during module initialization. It
 259  * must be called before registering the devices.
 260  *
 261  * Returns 0 on success or a negative error code.
 262  */
 263 int __rtnl_link_register(struct rtnl_link_ops *ops)
 264 {
 265         if (!ops->dellink)
 266                 ops->dellink = unregister_netdevice_queue;
 267
 268         list_add_tail(&ops->list, &link_ops);
 269         return 0;
 270 }
 271 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 272
 273 /**
 274  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 275  * @ops: struct rtnl_link_ops * to register
 276  *
 277  * Returns 0 on success or a negative error code.
 278  */
 279 int rtnl_link_register(struct rtnl_link_ops *ops)
 280 {
 281         int err;
 282
 283         rtnl_lock();
 284         err = __rtnl_link_register(ops);
 285         rtnl_unlock();
 286         return err;
 287 }
 288 EXPORT_SYMBOL_GPL(rtnl_link_register);
 289
 290 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 291 {
 292         struct net_device *dev;
 293         LIST_HEAD(list_kill);
 294
 295         for_each_netdev(net, dev) {
 296                 if (dev->rtnl_link_ops == ops)
 297                         ops->dellink(dev, &list_kill);
 298         }
 299         unregister_netdevice_many(&list_kill);
 300 }
 301
 302 /**
 303  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 304  * @ops: struct rtnl_link_ops * to unregister
 305  *
 306  * The caller must hold the rtnl_mutex.
 307  */
 308 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 309 {
 310         struct net *net;
 311
 312         for_each_net(net) {
 313                 __rtnl_kill_links(net, ops);
 314         }
 315         list_del(&ops->list);
 316 }
 317 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 318
 319 /**
 320  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 321  * @ops: struct rtnl_link_ops * to unregister
 322  */
 323 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 324 {
 325         rtnl_lock();
 326         __rtnl_link_unregister(ops);
 327         rtnl_unlock();
 328 }
 329 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 330
 331 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 332 {
 333         const struct rtnl_link_ops *ops;
 334
 335         list_for_each_entry(ops, &link_ops, list) {
 336                 if (!strcmp(ops->kind, kind))
 337                         return ops;
 338         }
 339         return NULL;
 340 }
 341
 342 static size_t rtnl_link_get_size(const struct net_device *dev)
 343 {
 344         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 345         size_t size;
 346
 347         if (!ops)
 348                 return 0;
 349
 350         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 351                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 352
 353         if (ops->get_size)
 354                 /* IFLA_INFO_DATA + nested data */
 355                 size += nla_total_size(sizeof(struct nlattr)) +
 356                         ops->get_size(dev);
 357
 358         if (ops->get_xstats_size)
 359                 /* IFLA_INFO_XSTATS */
 360                 size += nla_total_size(ops->get_xstats_size(dev));
 361
 362         return size;
 363 }
 364
 365 static LIST_HEAD(rtnl_af_ops);
 366
 367 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 368 {
 369         const struct rtnl_af_ops *ops;
 370
 371         list_for_each_entry(ops, &rtnl_af_ops, list) {
 372                 if (ops->family == family)
 373                         return ops;
 374         }
 375
 376         return NULL;
 377 }
 378
 379 /**
 380  * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 381  * @ops: struct rtnl_af_ops * to register
 382  *
 383  * The caller must hold the rtnl_mutex.
 384  *
 385  * Returns 0 on success or a negative error code.
 386  */
 387 int __rtnl_af_register(struct rtnl_af_ops *ops)
 388 {
 389         list_add_tail(&ops->list, &rtnl_af_ops);
 390         return 0;
 391 }
 392 EXPORT_SYMBOL_GPL(__rtnl_af_register);
 393
 394 /**
 395  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 396  * @ops: struct rtnl_af_ops * to register
 397  *
 398  * Returns 0 on success or a negative error code.
 399  */
 400 int rtnl_af_register(struct rtnl_af_ops *ops)
 401 {
 402         int err;
 403
 404         rtnl_lock();
 405         err = __rtnl_af_register(ops);
 406         rtnl_unlock();
 407         return err;
 408 }
 409 EXPORT_SYMBOL_GPL(rtnl_af_register);
 410
 411 /**
 412  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 413  * @ops: struct rtnl_af_ops * to unregister
 414  *
 415  * The caller must hold the rtnl_mutex.
 416  */
 417 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 418 {
 419         list_del(&ops->list);
 420 }
 421 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 422
 423 /**
 424  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 425  * @ops: struct rtnl_af_ops * to unregister
 426  */
 427 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 428 {
 429         rtnl_lock();
 430         __rtnl_af_unregister(ops);
 431         rtnl_unlock();
 432 }
 433 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 434
 435 static size_t rtnl_link_get_af_size(const struct net_device *dev)
 436 {
 437         struct rtnl_af_ops *af_ops;
 438         size_t size;
 439
 440         /* IFLA_AF_SPEC */
 441         size = nla_total_size(sizeof(struct nlattr));
 442
 443         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 444                 if (af_ops->get_link_af_size) {
 445                         /* AF_* + nested data */
 446                         size += nla_total_size(sizeof(struct nlattr)) +
 447                                 af_ops->get_link_af_size(dev);
 448                 }
 449         }
 450
 451         return size;
 452 }
 453
 454 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 455 {
 456         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 457         struct nlattr *linkinfo, *data;
 458         int err = -EMSGSIZE;
 459
 460         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 461         if (linkinfo == NULL)
 462                 goto out;
 463
 464         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 465                 goto err_cancel_link;
 466         if (ops->fill_xstats) {
 467                 err = ops->fill_xstats(skb, dev);
 468                 if (err < 0)
 469                         goto err_cancel_link;
 470         }
 471         if (ops->fill_info) {
 472                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 473                 if (data == NULL)
 474                         goto err_cancel_link;
 475                 err = ops->fill_info(skb, dev);
 476                 if (err < 0)
 477                         goto err_cancel_data;
 478                 nla_nest_end(skb, data);
 479         }
 480
 481         nla_nest_end(skb, linkinfo);
 482         return 0;
 483
 484 err_cancel_data:
 485         nla_nest_cancel(skb, data);
 486 err_cancel_link:
 487         nla_nest_cancel(skb, linkinfo);
 488 out:
 489         return err;
 490 }
 491
 492 static const int rtm_min[RTM_NR_FAMILIES] =
 493 {
 494         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 495         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
 496         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
 497         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
 498         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
 499         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
 500         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
 501         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
 502         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 503         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 504 };
 505
 506 static const int rta_max[RTM_NR_FAMILIES] =
 507 {
 508         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 509         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 510         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 511         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
 512         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 513         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 514         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 515         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 516 };
 517
 518 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 519 {
 520         struct rtattr *rta;
 521         int size = RTA_LENGTH(attrlen);
 522
 523         rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
 524         rta->rta_type = attrtype;
 525         rta->rta_len = size;
 526         memcpy(RTA_DATA(rta), data, attrlen);
 527         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 528 }
 529 EXPORT_SYMBOL(__rta_fill);
 530
 531 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
 532 {
 533         struct sock *rtnl = net->rtnl;
 534         int err = 0;
 535
 536         NETLINK_CB(skb).dst_group = group;
 537         if (echo)
 538                 atomic_inc(&skb->users);
 539         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 540         if (echo)
 541                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 542         return err;
 543 }
 544
 545 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 546 {
 547         struct sock *rtnl = net->rtnl;
 548
 549         return nlmsg_unicast(rtnl, skb, pid);
 550 }
 551 EXPORT_SYMBOL(rtnl_unicast);
 552
 553 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 554                  struct nlmsghdr *nlh, gfp_t flags)
 555 {
 556         struct sock *rtnl = net->rtnl;
 557         int report = 0;
 558
 559         if (nlh)
 560                 report = nlmsg_report(nlh);
 561
 562         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 563 }
 564 EXPORT_SYMBOL(rtnl_notify);
 565
 566 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 567 {
 568         struct sock *rtnl = net->rtnl;
 569
 570         netlink_set_err(rtnl, 0, group, error);
 571 }
 572 EXPORT_SYMBOL(rtnl_set_sk_err);
 573
 574 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 575 {
 576         struct nlattr *mx;
 577         int i, valid = 0;
 578
 579         mx = nla_nest_start(skb, RTA_METRICS);
 580         if (mx == NULL)
 581                 return -ENOBUFS;
 582
 583         for (i = 0; i < RTAX_MAX; i++) {
 584                 if (metrics[i]) {
 585                         valid++;
 586                         NLA_PUT_U32(skb, i+1, metrics[i]);
 587                 }
 588         }
 589
 590         if (!valid) {
 591                 nla_nest_cancel(skb, mx);
 592                 return 0;
 593         }
 594
 595         return nla_nest_end(skb, mx);
 596
 597 nla_put_failure:
 598         nla_nest_cancel(skb, mx);
 599         return -EMSGSIZE;
 600 }
 601 EXPORT_SYMBOL(rtnetlink_put_metrics);
 602
 603 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 604                        u32 ts, u32 tsage, long expires, u32 error)
 605 {
 606         struct rta_cacheinfo ci = {
 607                 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
 608                 .rta_used = dst->__use,
 609                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 610                 .rta_error = error,
 611                 .rta_id =  id,
 612                 .rta_ts = ts,
 613                 .rta_tsage = tsage,
 614         };
 615
 616         if (expires)
 617                 ci.rta_expires = jiffies_to_clock_t(expires);
 618
 619         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 620 }
 621 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 622
 623 static void set_operstate(struct net_device *dev, unsigned char transition)
 624 {
 625         unsigned char operstate = dev->operstate;
 626
 627         switch (transition) {
 628         case IF_OPER_UP:
 629                 if ((operstate == IF_OPER_DORMANT ||
 630                      operstate == IF_OPER_UNKNOWN) &&
 631                     !netif_dormant(dev))
 632                         operstate = IF_OPER_UP;
 633                 break;
 634
 635         case IF_OPER_DORMANT:
 636                 if (operstate == IF_OPER_UP ||
 637                     operstate == IF_OPER_UNKNOWN)
 638                         operstate = IF_OPER_DORMANT;
 639                 break;
 640         }
 641
 642         if (dev->operstate != operstate) {
 643                 write_lock_bh(&dev_base_lock);
 644                 dev->operstate = operstate;
 645                 write_unlock_bh(&dev_base_lock);
 646                 netdev_state_change(dev);
 647         }
 648 }
 649
 650 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 651                                            const struct ifinfomsg *ifm)
 652 {
 653         unsigned int flags = ifm->ifi_flags;
 654
 655         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 656         if (ifm->ifi_change)
 657                 flags = (flags & ifm->ifi_change) |
 658                         (dev->flags & ~ifm->ifi_change);
 659
 660         return flags;
 661 }
 662
 663 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 664                                  const struct rtnl_link_stats64 *b)
 665 {
 666         a->rx_packets = b->rx_packets;
 667         a->tx_packets = b->tx_packets;
 668         a->rx_bytes = b->rx_bytes;
 669         a->tx_bytes = b->tx_bytes;
 670         a->rx_errors = b->rx_errors;
 671         a->tx_errors = b->tx_errors;
 672         a->rx_dropped = b->rx_dropped;
 673         a->tx_dropped = b->tx_dropped;
 674
 675         a->multicast = b->multicast;
 676         a->collisions = b->collisions;
 677
 678         a->rx_length_errors = b->rx_length_errors;
 679         a->rx_over_errors = b->rx_over_errors;
 680         a->rx_crc_errors = b->rx_crc_errors;
 681         a->rx_frame_errors = b->rx_frame_errors;
 682         a->rx_fifo_errors = b->rx_fifo_errors;
 683         a->rx_missed_errors = b->rx_missed_errors;
 684
 685         a->tx_aborted_errors = b->tx_aborted_errors;
 686         a->tx_carrier_errors = b->tx_carrier_errors;
 687         a->tx_fifo_errors = b->tx_fifo_errors;
 688         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 689         a->tx_window_errors = b->tx_window_errors;
 690
 691         a->rx_compressed = b->rx_compressed;
 692         a->tx_compressed = b->tx_compressed;
 693 }
 694
 695 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
 696 {
 697         memcpy(v, b, sizeof(*b));
 698 }
 699
 700 /* All VF info */
 701 static inline int rtnl_vfinfo_size(const struct net_device *dev)
 702 {
 703         if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
 704
 705                 int num_vfs = dev_num_vf(dev->dev.parent);
 706                 size_t size = nla_total_size(sizeof(struct nlattr));
 707                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 708                 size += num_vfs *
 709                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 710                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 711                          nla_total_size(sizeof(struct ifla_vf_tx_rate)));
 712                 return size;
 713         } else
 714                 return 0;
 715 }
 716
 717 static size_t rtnl_port_size(const struct net_device *dev)
 718 {
 719         size_t port_size = nla_total_size(4)            /* PORT_VF */
 720                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 721                 + nla_total_size(sizeof(struct ifla_port_vsi))
 722                                                         /* PORT_VSI_TYPE */
 723                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 724                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 725                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 726                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 727         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 728         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 729                 + port_size;
 730         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 731                 + port_size;
 732
 733         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 734                 return 0;
 735         if (dev_num_vf(dev->dev.parent))
 736                 return port_self_size + vf_ports_size +
 737                         vf_port_size * dev_num_vf(dev->dev.parent);
 738         else
 739                 return port_self_size;
 740 }
 741
 742 static noinline size_t if_nlmsg_size(const struct net_device *dev)
 743 {
 744         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 745                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 746                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 747                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 748                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 749                + nla_total_size(sizeof(struct rtnl_link_stats))
 750                + nla_total_size(sizeof(struct rtnl_link_stats64))
 751                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 752                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 753                + nla_total_size(4) /* IFLA_TXQLEN */
 754                + nla_total_size(4) /* IFLA_WEIGHT */
 755                + nla_total_size(4) /* IFLA_MTU */
 756                + nla_total_size(4) /* IFLA_LINK */
 757                + nla_total_size(4) /* IFLA_MASTER */
 758                + nla_total_size(1) /* IFLA_OPERSTATE */
 759                + nla_total_size(1) /* IFLA_LINKMODE */
 760                + nla_total_size(4) /* IFLA_NUM_VF */
 761                + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
 762                + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 763                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 764                + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
 765 }
 766
 767 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 768 {
 769         struct nlattr *vf_ports;
 770         struct nlattr *vf_port;
 771         int vf;
 772         int err;
 773
 774         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 775         if (!vf_ports)
 776                 return -EMSGSIZE;
 777
 778         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 779                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 780                 if (!vf_port)
 781                         goto nla_put_failure;
 782                 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
 783                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 784                 if (err == -EMSGSIZE)
 785                         goto nla_put_failure;
 786                 if (err) {
 787                         nla_nest_cancel(skb, vf_port);
 788                         continue;
 789                 }
 790                 nla_nest_end(skb, vf_port);
 791         }
 792
 793         nla_nest_end(skb, vf_ports);
 794
 795         return 0;
 796
 797 nla_put_failure:
 798         nla_nest_cancel(skb, vf_ports);
 799         return -EMSGSIZE;
 800 }
 801
 802 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 803 {
 804         struct nlattr *port_self;
 805         int err;
 806
 807         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 808         if (!port_self)
 809                 return -EMSGSIZE;
 810
 811         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 812         if (err) {
 813                 nla_nest_cancel(skb, port_self);
 814                 return (err == -EMSGSIZE) ? err : 0;
 815         }
 816
 817         nla_nest_end(skb, port_self);
 818
 819         return 0;
 820 }
 821
 822 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
 823 {
 824         int err;
 825
 826         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 827                 return 0;
 828
 829         err = rtnl_port_self_fill(skb, dev);
 830         if (err)
 831                 return err;
 832
 833         if (dev_num_vf(dev->dev.parent)) {
 834                 err = rtnl_vf_ports_fill(skb, dev);
 835                 if (err)
 836                         return err;
 837         }
 838
 839         return 0;
 840 }
 841
 842 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 843                             int type, u32 pid, u32 seq, u32 change,
 844                             unsigned int flags)
 845 {
 846         struct ifinfomsg *ifm;
 847         struct nlmsghdr *nlh;
 848         struct rtnl_link_stats64 temp;
 849         const struct rtnl_link_stats64 *stats;
 850         struct nlattr *attr, *af_spec;
 851         struct rtnl_af_ops *af_ops;
 852
 853         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 854         if (nlh == NULL)
 855                 return -EMSGSIZE;
 856
 857         ifm = nlmsg_data(nlh);
 858         ifm->ifi_family = AF_UNSPEC;
 859         ifm->__ifi_pad = 0;
 860         ifm->ifi_type = dev->type;
 861         ifm->ifi_index = dev->ifindex;
 862         ifm->ifi_flags = dev_get_flags(dev);
 863         ifm->ifi_change = change;
 864
 865         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 866         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
 867         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 868                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
 869         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
 870         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
 871
 872         if (dev->ifindex != dev->iflink)
 873                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 874
 875         if (dev->master)
 876                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
 877
 878         if (dev->qdisc)
 879                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
 880
 881         if (dev->ifalias)
 882                 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
 883
 884         if (1) {
 885                 struct rtnl_link_ifmap map = {
 886                         .mem_start   = dev->mem_start,
 887                         .mem_end     = dev->mem_end,
 888                         .base_addr   = dev->base_addr,
 889                         .irq         = dev->irq,
 890                         .dma         = dev->dma,
 891                         .port        = dev->if_port,
 892                 };
 893                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 894         }
 895
 896         if (dev->addr_len) {
 897                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 898                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 899         }
 900
 901         attr = nla_reserve(skb, IFLA_STATS,
 902                         sizeof(struct rtnl_link_stats));
 903         if (attr == NULL)
 904                 goto nla_put_failure;
 905
 906         stats = dev_get_stats(dev, &temp);
 907         copy_rtnl_link_stats(nla_data(attr), stats);
 908
 909         attr = nla_reserve(skb, IFLA_STATS64,
 910                         sizeof(struct rtnl_link_stats64));
 911         if (attr == NULL)
 912                 goto nla_put_failure;
 913         copy_rtnl_link_stats64(nla_data(attr), stats);
 914
 915         if (dev->dev.parent)
 916                 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
 917
 918         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
 919                 int i;
 920
 921                 struct nlattr *vfinfo, *vf;
 922                 int num_vfs = dev_num_vf(dev->dev.parent);
 923
 924                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
 925                 if (!vfinfo)
 926                         goto nla_put_failure;
 927                 for (i = 0; i < num_vfs; i++) {
 928                         struct ifla_vf_info ivi;
 929                         struct ifla_vf_mac vf_mac;
 930                         struct ifla_vf_vlan vf_vlan;
 931                         struct ifla_vf_tx_rate vf_tx_rate;
 932                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
 933                                 break;
 934                         vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
 935                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
 936                         vf_vlan.vlan = ivi.vlan;
 937                         vf_vlan.qos = ivi.qos;
 938                         vf_tx_rate.rate = ivi.tx_rate;
 939                         vf = nla_nest_start(skb, IFLA_VF_INFO);
 940                         if (!vf) {
 941                                 nla_nest_cancel(skb, vfinfo);
 942                                 goto nla_put_failure;
 943                         }
 944                         NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
 945                         NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
 946                         NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
 947                         nla_nest_end(skb, vf);
 948                 }
 949                 nla_nest_end(skb, vfinfo);
 950         }
 951
 952         if (rtnl_port_fill(skb, dev))
 953                 goto nla_put_failure;
 954
 955         if (dev->rtnl_link_ops) {
 956                 if (rtnl_link_fill(skb, dev) < 0)
 957                         goto nla_put_failure;
 958         }
 959
 960         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
 961                 goto nla_put_failure;
 962
 963         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 964                 if (af_ops->fill_link_af) {
 965                         struct nlattr *af;
 966                         int err;
 967
 968                         if (!(af = nla_nest_start(skb, af_ops->family)))
 969                                 goto nla_put_failure;
 970
 971                         err = af_ops->fill_link_af(skb, dev);
 972
 973                         /*
 974                          * Caller may return ENODATA to indicate that there
 975                          * was no data to be dumped. This is not an error, it
 976                          * means we should trim the attribute header and
 977                          * continue.
 978                          */
 979                         if (err == -ENODATA)
 980                                 nla_nest_cancel(skb, af);
 981                         else if (err < 0)
 982                                 goto nla_put_failure;
 983
 984                         nla_nest_end(skb, af);
 985                 }
 986         }
 987
 988         nla_nest_end(skb, af_spec);
 989
 990         return nlmsg_end(skb, nlh);
 991
 992 nla_put_failure:
 993         nlmsg_cancel(skb, nlh);
 994         return -EMSGSIZE;
 995 }
 996
 997 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 998 {
 999         struct net *net = sock_net(skb->sk);
1000         int h, s_h;
1001         int idx = 0, s_idx;
1002         struct net_device *dev;
1003         struct hlist_head *head;
1004         struct hlist_node *node;
1005
1006         s_h = cb->args[0];
1007         s_idx = cb->args[1];
1008
1009         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1010                 idx = 0;
1011                 head = &net->dev_index_head[h];
1012                 hlist_for_each_entry(dev, node, head, index_hlist) {
1013                         if (idx < s_idx)
1014                                 goto cont;
1015                         if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1016                                              NETLINK_CB(cb->skb).pid,
1017                                              cb->nlh->nlmsg_seq, 0,
1018                                              NLM_F_MULTI) <= 0)
1019                                 goto out;
1020 cont:
1021                         idx++;
1022                 }
1023         }
1024 out:
1025         cb->args[1] = idx;
1026         cb->args[0] = h;
1027
1028         return skb->len;
1029 }
1030
1031 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1032         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1033         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1034         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1035         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1036         [IFLA_MTU]              = { .type = NLA_U32 },
1037         [IFLA_LINK]             = { .type = NLA_U32 },
1038         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1039         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1040         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1041         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1042         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1043         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1044         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1045         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1046         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1047         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1048         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1049 };
1050 EXPORT_SYMBOL(ifla_policy);
1051
1052 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1053         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1054         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1055 };
1056
1057 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1058         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1059 };
1060
1061 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1062         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1063                                     .len = sizeof(struct ifla_vf_mac) },
1064         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1065                                     .len = sizeof(struct ifla_vf_vlan) },
1066         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1067                                     .len = sizeof(struct ifla_vf_tx_rate) },
1068 };
1069
1070 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1071         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1072         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1073                                     .len = PORT_PROFILE_MAX },
1074         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1075                                     .len = sizeof(struct ifla_port_vsi)},
1076         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1077                                       .len = PORT_UUID_MAX },
1078         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1079                                     .len = PORT_UUID_MAX },
1080         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1081         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1082 };
1083
1084 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1085 {
1086         struct net *net;
1087         /* Examine the link attributes and figure out which
1088          * network namespace we are talking about.
1089          */
1090         if (tb[IFLA_NET_NS_PID])
1091                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1092         else
1093                 net = get_net(src_net);
1094         return net;
1095 }
1096 EXPORT_SYMBOL(rtnl_link_get_net);
1097
1098 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1099 {
1100         if (dev) {
1101                 if (tb[IFLA_ADDRESS] &&
1102                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1103                         return -EINVAL;
1104
1105                 if (tb[IFLA_BROADCAST] &&
1106                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1107                         return -EINVAL;
1108         }
1109
1110         if (tb[IFLA_AF_SPEC]) {
1111                 struct nlattr *af;
1112                 int rem, err;
1113
1114                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1115                         const struct rtnl_af_ops *af_ops;
1116
1117                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1118                                 return -EAFNOSUPPORT;
1119
1120                         if (!af_ops->set_link_af)
1121                                 return -EOPNOTSUPP;
1122
1123                         if (af_ops->validate_link_af) {
1124                                 err = af_ops->validate_link_af(dev,
1125                                                         tb[IFLA_AF_SPEC]);
1126                                 if (err < 0)
1127                                         return err;
1128                         }
1129                 }
1130         }
1131
1132         return 0;
1133 }
1134
1135 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1136 {
1137         int rem, err = -EINVAL;
1138         struct nlattr *vf;
1139         const struct net_device_ops *ops = dev->netdev_ops;
1140
1141         nla_for_each_nested(vf, attr, rem) {
1142                 switch (nla_type(vf)) {
1143                 case IFLA_VF_MAC: {
1144                         struct ifla_vf_mac *ivm;
1145                         ivm = nla_data(vf);
1146                         err = -EOPNOTSUPP;
1147                         if (ops->ndo_set_vf_mac)
1148                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1149                                                           ivm->mac);
1150                         break;
1151                 }
1152                 case IFLA_VF_VLAN: {
1153                         struct ifla_vf_vlan *ivv;
1154                         ivv = nla_data(vf);
1155                         err = -EOPNOTSUPP;
1156                         if (ops->ndo_set_vf_vlan)
1157                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1158                                                            ivv->vlan,
1159                                                            ivv->qos);
1160                         break;
1161                 }
1162                 case IFLA_VF_TX_RATE: {
1163                         struct ifla_vf_tx_rate *ivt;
1164                         ivt = nla_data(vf);
1165                         err = -EOPNOTSUPP;
1166                         if (ops->ndo_set_vf_tx_rate)
1167                                 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1168                                                               ivt->rate);
1169                         break;
1170                 }
1171                 default:
1172                         err = -EINVAL;
1173                         break;
1174                 }
1175                 if (err)
1176                         break;
1177         }
1178         return err;
1179 }
1180
1181 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1182                       struct nlattr **tb, char *ifname, int modified)
1183 {
1184         const struct net_device_ops *ops = dev->netdev_ops;
1185         int send_addr_notify = 0;
1186         int err;
1187
1188         if (tb[IFLA_NET_NS_PID]) {
1189                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1190                 if (IS_ERR(net)) {
1191                         err = PTR_ERR(net);
1192                         goto errout;
1193                 }
1194                 err = dev_change_net_namespace(dev, net, ifname);
1195                 put_net(net);
1196                 if (err)
1197                         goto errout;
1198                 modified = 1;
1199         }
1200
1201         if (tb[IFLA_MAP]) {
1202                 struct rtnl_link_ifmap *u_map;
1203                 struct ifmap k_map;
1204
1205                 if (!ops->ndo_set_config) {
1206                         err = -EOPNOTSUPP;
1207                         goto errout;
1208                 }
1209
1210                 if (!netif_device_present(dev)) {
1211                         err = -ENODEV;
1212                         goto errout;
1213                 }
1214
1215                 u_map = nla_data(tb[IFLA_MAP]);
1216                 k_map.mem_start = (unsigned long) u_map->mem_start;
1217                 k_map.mem_end = (unsigned long) u_map->mem_end;
1218                 k_map.base_addr = (unsigned short) u_map->base_addr;
1219                 k_map.irq = (unsigned char) u_map->irq;
1220                 k_map.dma = (unsigned char) u_map->dma;
1221                 k_map.port = (unsigned char) u_map->port;
1222
1223                 err = ops->ndo_set_config(dev, &k_map);
1224                 if (err < 0)
1225                         goto errout;
1226
1227                 modified = 1;
1228         }
1229
1230         if (tb[IFLA_ADDRESS]) {
1231                 struct sockaddr *sa;
1232                 int len;
1233
1234                 if (!ops->ndo_set_mac_address) {
1235                         err = -EOPNOTSUPP;
1236                         goto errout;
1237                 }
1238
1239                 if (!netif_device_present(dev)) {
1240                         err = -ENODEV;
1241                         goto errout;
1242                 }
1243
1244                 len = sizeof(sa_family_t) + dev->addr_len;
1245                 sa = kmalloc(len, GFP_KERNEL);
1246                 if (!sa) {
1247                         err = -ENOMEM;
1248                         goto errout;
1249                 }
1250                 sa->sa_family = dev->type;
1251                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1252                        dev->addr_len);
1253                 err = ops->ndo_set_mac_address(dev, sa);
1254                 kfree(sa);
1255                 if (err)
1256                         goto errout;
1257                 send_addr_notify = 1;
1258                 modified = 1;
1259         }
1260
1261         if (tb[IFLA_MTU]) {
1262                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1263                 if (err < 0)
1264                         goto errout;
1265                 modified = 1;
1266         }
1267
1268         /*
1269          * Interface selected by interface index but interface
1270          * name provided implies that a name change has been
1271          * requested.
1272          */
1273         if (ifm->ifi_index > 0 && ifname[0]) {
1274                 err = dev_change_name(dev, ifname);
1275                 if (err < 0)
1276                         goto errout;
1277                 modified = 1;
1278         }
1279
1280         if (tb[IFLA_IFALIAS]) {
1281                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1282                                     nla_len(tb[IFLA_IFALIAS]));
1283                 if (err < 0)
1284                         goto errout;
1285                 modified = 1;
1286         }
1287
1288         if (tb[IFLA_BROADCAST]) {
1289                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1290                 send_addr_notify = 1;
1291         }
1292
1293         if (ifm->ifi_flags || ifm->ifi_change) {
1294                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1295                 if (err < 0)
1296                         goto errout;
1297         }
1298
1299         if (tb[IFLA_TXQLEN])
1300                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1301
1302         if (tb[IFLA_OPERSTATE])
1303                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1304
1305         if (tb[IFLA_LINKMODE]) {
1306                 write_lock_bh(&dev_base_lock);
1307                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1308                 write_unlock_bh(&dev_base_lock);
1309         }
1310
1311         if (tb[IFLA_VFINFO_LIST]) {
1312                 struct nlattr *attr;
1313                 int rem;
1314                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1315                         if (nla_type(attr) != IFLA_VF_INFO) {
1316                                 err = -EINVAL;
1317                                 goto errout;
1318                         }
1319                         err = do_setvfinfo(dev, attr);
1320                         if (err < 0)
1321                                 goto errout;
1322                         modified = 1;
1323                 }
1324         }
1325         err = 0;
1326
1327         if (tb[IFLA_VF_PORTS]) {
1328                 struct nlattr *port[IFLA_PORT_MAX+1];
1329                 struct nlattr *attr;
1330                 int vf;
1331                 int rem;
1332
1333                 err = -EOPNOTSUPP;
1334                 if (!ops->ndo_set_vf_port)
1335                         goto errout;
1336
1337                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1338                         if (nla_type(attr) != IFLA_VF_PORT)
1339                                 continue;
1340                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1341                                 attr, ifla_port_policy);
1342                         if (err < 0)
1343                                 goto errout;
1344                         if (!port[IFLA_PORT_VF]) {
1345                                 err = -EOPNOTSUPP;
1346                                 goto errout;
1347                         }
1348                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1349                         err = ops->ndo_set_vf_port(dev, vf, port);
1350                         if (err < 0)
1351                                 goto errout;
1352                         modified = 1;
1353                 }
1354         }
1355         err = 0;
1356
1357         if (tb[IFLA_PORT_SELF]) {
1358                 struct nlattr *port[IFLA_PORT_MAX+1];
1359
1360                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1361                         tb[IFLA_PORT_SELF], ifla_port_policy);
1362                 if (err < 0)
1363                         goto errout;
1364
1365                 err = -EOPNOTSUPP;
1366                 if (ops->ndo_set_vf_port)
1367                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1368                 if (err < 0)
1369                         goto errout;
1370                 modified = 1;
1371         }
1372
1373         if (tb[IFLA_AF_SPEC]) {
1374                 struct nlattr *af;
1375                 int rem;
1376
1377                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1378                         const struct rtnl_af_ops *af_ops;
1379
1380                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1381                                 BUG();
1382
1383                         err = af_ops->set_link_af(dev, af);
1384                         if (err < 0)
1385                                 goto errout;
1386
1387                         modified = 1;
1388                 }
1389         }
1390         err = 0;
1391
1392 errout:
1393         if (err < 0 && modified && net_ratelimit())
1394                 printk(KERN_WARNING "A link change request failed with "
1395                        "some changes comitted already. Interface %s may "
1396                        "have been left with an inconsistent configuration, "
1397                        "please check.\n", dev->name);
1398
1399         if (send_addr_notify)
1400                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1401         return err;
1402 }
1403
1404 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1405 {
1406         struct net *net = sock_net(skb->sk);
1407         struct ifinfomsg *ifm;
1408         struct net_device *dev;
1409         int err;
1410         struct nlattr *tb[IFLA_MAX+1];
1411         char ifname[IFNAMSIZ];
1412
1413         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1414         if (err < 0)
1415                 goto errout;
1416
1417         if (tb[IFLA_IFNAME])
1418                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1419         else
1420                 ifname[0] = '\0';
1421
1422         err = -EINVAL;
1423         ifm = nlmsg_data(nlh);
1424         if (ifm->ifi_index > 0)
1425                 dev = __dev_get_by_index(net, ifm->ifi_index);
1426         else if (tb[IFLA_IFNAME])
1427                 dev = __dev_get_by_name(net, ifname);
1428         else
1429                 goto errout;
1430
1431         if (dev == NULL) {
1432                 err = -ENODEV;
1433                 goto errout;
1434         }
1435
1436         err = validate_linkmsg(dev, tb);
1437         if (err < 0)
1438                 goto errout;
1439
1440         err = do_setlink(dev, ifm, tb, ifname, 0);
1441 errout:
1442         return err;
1443 }
1444
1445 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1446 {
1447         struct net *net = sock_net(skb->sk);
1448         const struct rtnl_link_ops *ops;
1449         struct net_device *dev;
1450         struct ifinfomsg *ifm;
1451         char ifname[IFNAMSIZ];
1452         struct nlattr *tb[IFLA_MAX+1];
1453         int err;
1454
1455         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1456         if (err < 0)
1457                 return err;
1458
1459         if (tb[IFLA_IFNAME])
1460                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1461
1462         ifm = nlmsg_data(nlh);
1463         if (ifm->ifi_index > 0)
1464                 dev = __dev_get_by_index(net, ifm->ifi_index);
1465         else if (tb[IFLA_IFNAME])
1466                 dev = __dev_get_by_name(net, ifname);
1467         else
1468                 return -EINVAL;
1469
1470         if (!dev)
1471                 return -ENODEV;
1472
1473         ops = dev->rtnl_link_ops;
1474         if (!ops)
1475                 return -EOPNOTSUPP;
1476
1477         ops->dellink(dev, NULL);
1478         return 0;
1479 }
1480
1481 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1482 {
1483         unsigned int old_flags;
1484         int err;
1485
1486         old_flags = dev->flags;
1487         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1488                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1489                 if (err < 0)
1490                         return err;
1491         }
1492
1493         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1494         rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1495
1496         __dev_notify_flags(dev, old_flags);
1497         return 0;
1498 }
1499 EXPORT_SYMBOL(rtnl_configure_link);
1500
1501 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1502         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1503 {
1504         int err;
1505         struct net_device *dev;
1506         unsigned int num_queues = 1;
1507         unsigned int real_num_queues = 1;
1508
1509         if (ops->get_tx_queues) {
1510                 err = ops->get_tx_queues(src_net, tb, &num_queues,
1511                                          &real_num_queues);
1512                 if (err)
1513                         goto err;
1514         }
1515         err = -ENOMEM;
1516         dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1517         if (!dev)
1518                 goto err;
1519
1520         dev_net_set(dev, net);
1521         dev->rtnl_link_ops = ops;
1522         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1523         dev->real_num_tx_queues = real_num_queues;
1524
1525         if (strchr(dev->name, '%')) {
1526                 err = dev_alloc_name(dev, dev->name);
1527                 if (err < 0)
1528                         goto err_free;
1529         }
1530
1531         if (tb[IFLA_MTU])
1532                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1533         if (tb[IFLA_ADDRESS])
1534                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1535                                 nla_len(tb[IFLA_ADDRESS]));
1536         if (tb[IFLA_BROADCAST])
1537                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1538                                 nla_len(tb[IFLA_BROADCAST]));
1539         if (tb[IFLA_TXQLEN])
1540                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1541         if (tb[IFLA_OPERSTATE])
1542                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1543         if (tb[IFLA_LINKMODE])
1544                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1545
1546         return dev;
1547
1548 err_free:
1549         free_netdev(dev);
1550 err:
1551         return ERR_PTR(err);
1552 }
1553 EXPORT_SYMBOL(rtnl_create_link);
1554
1555 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1556 {
1557         struct net *net = sock_net(skb->sk);
1558         const struct rtnl_link_ops *ops;
1559         struct net_device *dev;
1560         struct ifinfomsg *ifm;
1561         char kind[MODULE_NAME_LEN];
1562         char ifname[IFNAMSIZ];
1563         struct nlattr *tb[IFLA_MAX+1];
1564         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1565         int err;
1566
1567 #ifdef CONFIG_MODULES
1568 replay:
1569 #endif
1570         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1571         if (err < 0)
1572                 return err;
1573
1574         if (tb[IFLA_IFNAME])
1575                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1576         else
1577                 ifname[0] = '\0';
1578
1579         ifm = nlmsg_data(nlh);
1580         if (ifm->ifi_index > 0)
1581                 dev = __dev_get_by_index(net, ifm->ifi_index);
1582         else if (ifname[0])
1583                 dev = __dev_get_by_name(net, ifname);
1584         else
1585                 dev = NULL;
1586
1587         err = validate_linkmsg(dev, tb);
1588         if (err < 0)
1589                 return err;
1590
1591         if (tb[IFLA_LINKINFO]) {
1592                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1593                                        tb[IFLA_LINKINFO], ifla_info_policy);
1594                 if (err < 0)
1595                         return err;
1596         } else
1597                 memset(linkinfo, 0, sizeof(linkinfo));
1598
1599         if (linkinfo[IFLA_INFO_KIND]) {
1600                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1601                 ops = rtnl_link_ops_get(kind);
1602         } else {
1603                 kind[0] = '\0';
1604                 ops = NULL;
1605         }
1606
1607         if (1) {
1608                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1609                 struct net *dest_net;
1610
1611                 if (ops) {
1612                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1613                                 err = nla_parse_nested(attr, ops->maxtype,
1614                                                        linkinfo[IFLA_INFO_DATA],
1615                                                        ops->policy);
1616                                 if (err < 0)
1617                                         return err;
1618                                 data = attr;
1619                         }
1620                         if (ops->validate) {
1621                                 err = ops->validate(tb, data);
1622                                 if (err < 0)
1623                                         return err;
1624                         }
1625                 }
1626
1627                 if (dev) {
1628                         int modified = 0;
1629
1630                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1631                                 return -EEXIST;
1632                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1633                                 return -EOPNOTSUPP;
1634
1635                         if (linkinfo[IFLA_INFO_DATA]) {
1636                                 if (!ops || ops != dev->rtnl_link_ops ||
1637                                     !ops->changelink)
1638                                         return -EOPNOTSUPP;
1639
1640                                 err = ops->changelink(dev, tb, data);
1641                                 if (err < 0)
1642                                         return err;
1643                                 modified = 1;
1644                         }
1645
1646                         return do_setlink(dev, ifm, tb, ifname, modified);
1647                 }
1648
1649                 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1650                         return -ENODEV;
1651
1652                 if (ifm->ifi_index)
1653                         return -EOPNOTSUPP;
1654                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1655                         return -EOPNOTSUPP;
1656
1657                 if (!ops) {
1658 #ifdef CONFIG_MODULES
1659                         if (kind[0]) {
1660                                 __rtnl_unlock();
1661                                 request_module("rtnl-link-%s", kind);
1662                                 rtnl_lock();
1663                                 ops = rtnl_link_ops_get(kind);
1664                                 if (ops)
1665                                         goto replay;
1666                         }
1667 #endif
1668                         return -EOPNOTSUPP;
1669                 }
1670
1671                 if (!ifname[0])
1672                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1673
1674                 dest_net = rtnl_link_get_net(net, tb);
1675                 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1676
1677                 if (IS_ERR(dev))
1678                         err = PTR_ERR(dev);
1679                 else if (ops->newlink)
1680                         err = ops->newlink(net, dev, tb, data);
1681                 else
1682                         err = register_netdevice(dev);
1683
1684                 if (err < 0 && !IS_ERR(dev))
1685                         free_netdev(dev);
1686                 if (err < 0)
1687                         goto out;
1688
1689                 err = rtnl_configure_link(dev, ifm);
1690                 if (err < 0)
1691                         unregister_netdevice(dev);
1692 out:
1693                 put_net(dest_net);
1694                 return err;
1695         }
1696 }
1697
1698 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1699 {
1700         struct net *net = sock_net(skb->sk);
1701         struct ifinfomsg *ifm;
1702         char ifname[IFNAMSIZ];
1703         struct nlattr *tb[IFLA_MAX+1];
1704         struct net_device *dev = NULL;
1705         struct sk_buff *nskb;
1706         int err;
1707
1708         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1709         if (err < 0)
1710                 return err;
1711
1712         if (tb[IFLA_IFNAME])
1713                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1714
1715         ifm = nlmsg_data(nlh);
1716         if (ifm->ifi_index > 0)
1717                 dev = __dev_get_by_index(net, ifm->ifi_index);
1718         else if (tb[IFLA_IFNAME])
1719                 dev = __dev_get_by_name(net, ifname);
1720         else
1721                 return -EINVAL;
1722
1723         if (dev == NULL)
1724                 return -ENODEV;
1725
1726         nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1727         if (nskb == NULL)
1728                 return -ENOBUFS;
1729
1730         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1731                                nlh->nlmsg_seq, 0, 0);
1732         if (err < 0) {
1733                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1734                 WARN_ON(err == -EMSGSIZE);
1735                 kfree_skb(nskb);
1736         } else
1737                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1738
1739         return err;
1740 }
1741
1742 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1743 {
1744         int idx;
1745         int s_idx = cb->family;
1746
1747         if (s_idx == 0)
1748                 s_idx = 1;
1749         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1750                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1751                 if (idx < s_idx || idx == PF_PACKET)
1752                         continue;
1753                 if (rtnl_msg_handlers[idx] == NULL ||
1754                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1755                         continue;
1756                 if (idx > s_idx)
1757                         memset(&cb->args[0], 0, sizeof(cb->args));
1758                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1759                         break;
1760         }
1761         cb->family = idx;
1762
1763         return skb->len;
1764 }
1765
1766 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1767 {
1768         struct net *net = dev_net(dev);
1769         struct sk_buff *skb;
1770         int err = -ENOBUFS;
1771
1772         skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1773         if (skb == NULL)
1774                 goto errout;
1775
1776         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1777         if (err < 0) {
1778                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1779                 WARN_ON(err == -EMSGSIZE);
1780                 kfree_skb(skb);
1781                 goto errout;
1782         }
1783         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1784         return;
1785 errout:
1786         if (err < 0)
1787                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1788 }
1789
1790 /* Protected by RTNL sempahore.  */
1791 static struct rtattr **rta_buf;
1792 static int rtattr_max;
1793
1794 /* Process one rtnetlink message. */
1795
1796 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1797 {
1798         struct net *net = sock_net(skb->sk);
1799         rtnl_doit_func doit;
1800         int sz_idx, kind;
1801         int min_len;
1802         int family;
1803         int type;
1804         int err;
1805
1806         type = nlh->nlmsg_type;
1807         if (type > RTM_MAX)
1808                 return -EOPNOTSUPP;
1809
1810         type -= RTM_BASE;
1811
1812         /* All the messages must have at least 1 byte length */
1813         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1814                 return 0;
1815
1816         family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1817         sz_idx = type>>2;
1818         kind = type&3;
1819
1820         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1821                 return -EPERM;
1822
1823         if (kind == 2 && (nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
1824                 struct sock *rtnl;
1825                 rtnl_dumpit_func dumpit;
1826
1827                 dumpit = rtnl_get_dumpit(family, type);
1828                 if (dumpit == NULL)
1829                         return -EOPNOTSUPP;
1830
1831                 __rtnl_unlock();
1832                 rtnl = net->rtnl;
1833                 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1834                 rtnl_lock();
1835                 return err;
1836         }
1837
1838         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1839
1840         min_len = rtm_min[sz_idx];
1841         if (nlh->nlmsg_len < min_len)
1842                 return -EINVAL;
1843
1844         if (nlh->nlmsg_len > min_len) {
1845                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1846                 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1847
1848                 while (RTA_OK(attr, attrlen)) {
1849                         unsigned flavor = attr->rta_type;
1850                         if (flavor) {
1851                                 if (flavor > rta_max[sz_idx])
1852                                         return -EINVAL;
1853                                 rta_buf[flavor-1] = attr;
1854                         }
1855                         attr = RTA_NEXT(attr, attrlen);
1856                 }
1857         }
1858
1859         doit = rtnl_get_doit(family, type);
1860         if (doit == NULL)
1861                 return -EOPNOTSUPP;
1862
1863         return doit(skb, nlh, (void *)&rta_buf[0]);
1864 }
1865
1866 static void rtnetlink_rcv(struct sk_buff *skb)
1867 {
1868         rtnl_lock();
1869         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1870         rtnl_unlock();
1871 }
1872
1873 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1874 {
1875         struct net_device *dev = ptr;
1876
1877         switch (event) {
1878         case NETDEV_UP:
1879         case NETDEV_DOWN:
1880         case NETDEV_PRE_UP:
1881         case NETDEV_POST_INIT:
1882         case NETDEV_REGISTER:
1883         case NETDEV_CHANGE:
1884         case NETDEV_PRE_TYPE_CHANGE:
1885         case NETDEV_GOING_DOWN:
1886         case NETDEV_UNREGISTER:
1887         case NETDEV_UNREGISTER_BATCH:
1888                 break;
1889         default:
1890                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1891                 break;
1892         }
1893         return NOTIFY_DONE;
1894 }
1895
1896 static struct notifier_block rtnetlink_dev_notifier = {
1897         .notifier_call  = rtnetlink_event,
1898 };
1899
1900
1901 static int __net_init rtnetlink_net_init(struct net *net)
1902 {
1903         struct sock *sk;
1904         sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1905                                    rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1906         if (!sk)
1907                 return -ENOMEM;
1908         net->rtnl = sk;
1909         return 0;
1910 }
1911
1912 static void __net_exit rtnetlink_net_exit(struct net *net)
1913 {
1914         netlink_kernel_release(net->rtnl);
1915         net->rtnl = NULL;
1916 }
1917
1918 static struct pernet_operations rtnetlink_net_ops = {
1919         .init = rtnetlink_net_init,
1920         .exit = rtnetlink_net_exit,
1921 };
1922
1923 void __init rtnetlink_init(void)
1924 {
1925         int i;
1926
1927         rtattr_max = 0;
1928         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1929                 if (rta_max[i] > rtattr_max)
1930                         rtattr_max = rta_max[i];
1931         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1932         if (!rta_buf)
1933                 panic("rtnetlink_init: cannot allocate rta_buf\n");
1934
1935         if (register_pernet_subsys(&rtnetlink_net_ops))
1936                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1937
1938         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1939         register_netdevice_notifier(&rtnetlink_dev_notifier);
1940
1941         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1942         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1943         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1944         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1945
1946         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1947         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1948 }
1949