Pileus Git - ~andy/linux/blob - 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         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1036                 idx = 0;
1037                 head = &net->dev_index_head[h];
1038                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1039                         if (idx < s_idx)
1040                                 goto cont;
1041                         if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1042                                              NETLINK_CB(cb->skb).pid,
1043                                              cb->nlh->nlmsg_seq, 0,
1044                                              NLM_F_MULTI) <= 0)
1045                                 goto out;
1046 cont:
1047                         idx++;
1048                 }
1049         }
1050 out:
1051         rcu_read_unlock();
1052         cb->args[1] = idx;
1053         cb->args[0] = h;
1054
1055         return skb->len;
1056 }
1057
1058 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1059         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1060         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1061         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1062         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1063         [IFLA_MTU]              = { .type = NLA_U32 },
1064         [IFLA_LINK]             = { .type = NLA_U32 },
1065         [IFLA_MASTER]           = { .type = NLA_U32 },
1066         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1067         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1068         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1069         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1070         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1071         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1072         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1073         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1074         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1075         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1076         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1077         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1078 };
1079 EXPORT_SYMBOL(ifla_policy);
1080
1081 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1082         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1083         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1084 };
1085
1086 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1087         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1088 };
1089
1090 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1091         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1092                                     .len = sizeof(struct ifla_vf_mac) },
1093         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1094                                     .len = sizeof(struct ifla_vf_vlan) },
1095         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1096                                     .len = sizeof(struct ifla_vf_tx_rate) },
1097 };
1098
1099 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1100         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1101         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1102                                     .len = PORT_PROFILE_MAX },
1103         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1104                                     .len = sizeof(struct ifla_port_vsi)},
1105         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1106                                       .len = PORT_UUID_MAX },
1107         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1108                                     .len = PORT_UUID_MAX },
1109         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1110         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1111 };
1112
1113 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1114 {
1115         struct net *net;
1116         /* Examine the link attributes and figure out which
1117          * network namespace we are talking about.
1118          */
1119         if (tb[IFLA_NET_NS_PID])
1120                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1121         else if (tb[IFLA_NET_NS_FD])
1122                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1123         else
1124                 net = get_net(src_net);
1125         return net;
1126 }
1127 EXPORT_SYMBOL(rtnl_link_get_net);
1128
1129 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1130 {
1131         if (dev) {
1132                 if (tb[IFLA_ADDRESS] &&
1133                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1134                         return -EINVAL;
1135
1136                 if (tb[IFLA_BROADCAST] &&
1137                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1138                         return -EINVAL;
1139         }
1140
1141         if (tb[IFLA_AF_SPEC]) {
1142                 struct nlattr *af;
1143                 int rem, err;
1144
1145                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1146                         const struct rtnl_af_ops *af_ops;
1147
1148                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1149                                 return -EAFNOSUPPORT;
1150
1151                         if (!af_ops->set_link_af)
1152                                 return -EOPNOTSUPP;
1153
1154                         if (af_ops->validate_link_af) {
1155                                 err = af_ops->validate_link_af(dev, af);
1156                                 if (err < 0)
1157                                         return err;
1158                         }
1159                 }
1160         }
1161
1162         return 0;
1163 }
1164
1165 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1166 {
1167         int rem, err = -EINVAL;
1168         struct nlattr *vf;
1169         const struct net_device_ops *ops = dev->netdev_ops;
1170
1171         nla_for_each_nested(vf, attr, rem) {
1172                 switch (nla_type(vf)) {
1173                 case IFLA_VF_MAC: {
1174                         struct ifla_vf_mac *ivm;
1175                         ivm = nla_data(vf);
1176                         err = -EOPNOTSUPP;
1177                         if (ops->ndo_set_vf_mac)
1178                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1179                                                           ivm->mac);
1180                         break;
1181                 }
1182                 case IFLA_VF_VLAN: {
1183                         struct ifla_vf_vlan *ivv;
1184                         ivv = nla_data(vf);
1185                         err = -EOPNOTSUPP;
1186                         if (ops->ndo_set_vf_vlan)
1187                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1188                                                            ivv->vlan,
1189                                                            ivv->qos);
1190                         break;
1191                 }
1192                 case IFLA_VF_TX_RATE: {
1193                         struct ifla_vf_tx_rate *ivt;
1194                         ivt = nla_data(vf);
1195                         err = -EOPNOTSUPP;
1196                         if (ops->ndo_set_vf_tx_rate)
1197                                 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1198                                                               ivt->rate);
1199                         break;
1200                 }
1201                 default:
1202                         err = -EINVAL;
1203                         break;
1204                 }
1205                 if (err)
1206                         break;
1207         }
1208         return err;
1209 }
1210
1211 static int do_set_master(struct net_device *dev, int ifindex)
1212 {
1213         struct net_device *master_dev;
1214         const struct net_device_ops *ops;
1215         int err;
1216
1217         if (dev->master) {
1218                 if (dev->master->ifindex == ifindex)
1219                         return 0;
1220                 ops = dev->master->netdev_ops;
1221                 if (ops->ndo_del_slave) {
1222                         err = ops->ndo_del_slave(dev->master, dev);
1223                         if (err)
1224                                 return err;
1225                 } else {
1226                         return -EOPNOTSUPP;
1227                 }
1228         }
1229
1230         if (ifindex) {
1231                 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1232                 if (!master_dev)
1233                         return -EINVAL;
1234                 ops = master_dev->netdev_ops;
1235                 if (ops->ndo_add_slave) {
1236                         err = ops->ndo_add_slave(master_dev, dev);
1237                         if (err)
1238                                 return err;
1239                 } else {
1240                         return -EOPNOTSUPP;
1241                 }
1242         }
1243         return 0;
1244 }
1245
1246 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1247                       struct nlattr **tb, char *ifname, int modified)
1248 {
1249         const struct net_device_ops *ops = dev->netdev_ops;
1250         int send_addr_notify = 0;
1251         int err;
1252
1253         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1254                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1255                 if (IS_ERR(net)) {
1256                         err = PTR_ERR(net);
1257                         goto errout;
1258                 }
1259                 err = dev_change_net_namespace(dev, net, ifname);
1260                 put_net(net);
1261                 if (err)
1262                         goto errout;
1263                 modified = 1;
1264         }
1265
1266         if (tb[IFLA_MAP]) {
1267                 struct rtnl_link_ifmap *u_map;
1268                 struct ifmap k_map;
1269
1270                 if (!ops->ndo_set_config) {
1271                         err = -EOPNOTSUPP;
1272                         goto errout;
1273                 }
1274
1275                 if (!netif_device_present(dev)) {
1276                         err = -ENODEV;
1277                         goto errout;
1278                 }
1279
1280                 u_map = nla_data(tb[IFLA_MAP]);
1281                 k_map.mem_start = (unsigned long) u_map->mem_start;
1282                 k_map.mem_end = (unsigned long) u_map->mem_end;
1283                 k_map.base_addr = (unsigned short) u_map->base_addr;
1284                 k_map.irq = (unsigned char) u_map->irq;
1285                 k_map.dma = (unsigned char) u_map->dma;
1286                 k_map.port = (unsigned char) u_map->port;
1287
1288                 err = ops->ndo_set_config(dev, &k_map);
1289                 if (err < 0)
1290                         goto errout;
1291
1292                 modified = 1;
1293         }
1294
1295         if (tb[IFLA_ADDRESS]) {
1296                 struct sockaddr *sa;
1297                 int len;
1298
1299                 if (!ops->ndo_set_mac_address) {
1300                         err = -EOPNOTSUPP;
1301                         goto errout;
1302                 }
1303
1304                 if (!netif_device_present(dev)) {
1305                         err = -ENODEV;
1306                         goto errout;
1307                 }
1308
1309                 len = sizeof(sa_family_t) + dev->addr_len;
1310                 sa = kmalloc(len, GFP_KERNEL);
1311                 if (!sa) {
1312                         err = -ENOMEM;
1313                         goto errout;
1314                 }
1315                 sa->sa_family = dev->type;
1316                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1317                        dev->addr_len);
1318                 err = ops->ndo_set_mac_address(dev, sa);
1319                 kfree(sa);
1320                 if (err)
1321                         goto errout;
1322                 send_addr_notify = 1;
1323                 modified = 1;
1324         }
1325
1326         if (tb[IFLA_MTU]) {
1327                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1328                 if (err < 0)
1329                         goto errout;
1330                 modified = 1;
1331         }
1332
1333         if (tb[IFLA_GROUP]) {
1334                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1335                 modified = 1;
1336         }
1337
1338         /*
1339          * Interface selected by interface index but interface
1340          * name provided implies that a name change has been
1341          * requested.
1342          */
1343         if (ifm->ifi_index > 0 && ifname[0]) {
1344                 err = dev_change_name(dev, ifname);
1345                 if (err < 0)
1346                         goto errout;
1347                 modified = 1;
1348         }
1349
1350         if (tb[IFLA_IFALIAS]) {
1351                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1352                                     nla_len(tb[IFLA_IFALIAS]));
1353                 if (err < 0)
1354                         goto errout;
1355                 modified = 1;
1356         }
1357
1358         if (tb[IFLA_BROADCAST]) {
1359                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1360                 send_addr_notify = 1;
1361         }
1362
1363         if (ifm->ifi_flags || ifm->ifi_change) {
1364                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1365                 if (err < 0)
1366                         goto errout;
1367         }
1368
1369         if (tb[IFLA_MASTER]) {
1370                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1371                 if (err)
1372                         goto errout;
1373                 modified = 1;
1374         }
1375
1376         if (tb[IFLA_TXQLEN])
1377                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1378
1379         if (tb[IFLA_OPERSTATE])
1380                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1381
1382         if (tb[IFLA_LINKMODE]) {
1383                 write_lock_bh(&dev_base_lock);
1384                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1385                 write_unlock_bh(&dev_base_lock);
1386         }
1387
1388         if (tb[IFLA_VFINFO_LIST]) {
1389                 struct nlattr *attr;
1390                 int rem;
1391                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1392                         if (nla_type(attr) != IFLA_VF_INFO) {
1393                                 err = -EINVAL;
1394                                 goto errout;
1395                         }
1396                         err = do_setvfinfo(dev, attr);
1397                         if (err < 0)
1398                                 goto errout;
1399                         modified = 1;
1400                 }
1401         }
1402         err = 0;
1403
1404         if (tb[IFLA_VF_PORTS]) {
1405                 struct nlattr *port[IFLA_PORT_MAX+1];
1406                 struct nlattr *attr;
1407                 int vf;
1408                 int rem;
1409
1410                 err = -EOPNOTSUPP;
1411                 if (!ops->ndo_set_vf_port)
1412                         goto errout;
1413
1414                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1415                         if (nla_type(attr) != IFLA_VF_PORT)
1416                                 continue;
1417                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1418                                 attr, ifla_port_policy);
1419                         if (err < 0)
1420                                 goto errout;
1421                         if (!port[IFLA_PORT_VF]) {
1422                                 err = -EOPNOTSUPP;
1423                                 goto errout;
1424                         }
1425                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1426                         err = ops->ndo_set_vf_port(dev, vf, port);
1427                         if (err < 0)
1428                                 goto errout;
1429                         modified = 1;
1430                 }
1431         }
1432         err = 0;
1433
1434         if (tb[IFLA_PORT_SELF]) {
1435                 struct nlattr *port[IFLA_PORT_MAX+1];
1436
1437                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1438                         tb[IFLA_PORT_SELF], ifla_port_policy);
1439                 if (err < 0)
1440                         goto errout;
1441
1442                 err = -EOPNOTSUPP;
1443                 if (ops->ndo_set_vf_port)
1444                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1445                 if (err < 0)
1446                         goto errout;
1447                 modified = 1;
1448         }
1449
1450         if (tb[IFLA_AF_SPEC]) {
1451                 struct nlattr *af;
1452                 int rem;
1453
1454                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1455                         const struct rtnl_af_ops *af_ops;
1456
1457                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1458                                 BUG();
1459
1460                         err = af_ops->set_link_af(dev, af);
1461                         if (err < 0)
1462                                 goto errout;
1463
1464                         modified = 1;
1465                 }
1466         }
1467         err = 0;
1468
1469 errout:
1470         if (err < 0 && modified && net_ratelimit())
1471                 printk(KERN_WARNING "A link change request failed with "
1472                        "some changes committed already. Interface %s may "
1473                        "have been left with an inconsistent configuration, "
1474                        "please check.\n", dev->name);
1475
1476         if (send_addr_notify)
1477                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1478         return err;
1479 }
1480
1481 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1482 {
1483         struct net *net = sock_net(skb->sk);
1484         struct ifinfomsg *ifm;
1485         struct net_device *dev;
1486         int err;
1487         struct nlattr *tb[IFLA_MAX+1];
1488         char ifname[IFNAMSIZ];
1489
1490         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1491         if (err < 0)
1492                 goto errout;
1493
1494         if (tb[IFLA_IFNAME])
1495                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1496         else
1497                 ifname[0] = '\0';
1498
1499         err = -EINVAL;
1500         ifm = nlmsg_data(nlh);
1501         if (ifm->ifi_index > 0)
1502                 dev = __dev_get_by_index(net, ifm->ifi_index);
1503         else if (tb[IFLA_IFNAME])
1504                 dev = __dev_get_by_name(net, ifname);
1505         else
1506                 goto errout;
1507
1508         if (dev == NULL) {
1509                 err = -ENODEV;
1510                 goto errout;
1511         }
1512
1513         err = validate_linkmsg(dev, tb);
1514         if (err < 0)
1515                 goto errout;
1516
1517         err = do_setlink(dev, ifm, tb, ifname, 0);
1518 errout:
1519         return err;
1520 }
1521
1522 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1523 {
1524         struct net *net = sock_net(skb->sk);
1525         const struct rtnl_link_ops *ops;
1526         struct net_device *dev;
1527         struct ifinfomsg *ifm;
1528         char ifname[IFNAMSIZ];
1529         struct nlattr *tb[IFLA_MAX+1];
1530         int err;
1531         LIST_HEAD(list_kill);
1532
1533         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1534         if (err < 0)
1535                 return err;
1536
1537         if (tb[IFLA_IFNAME])
1538                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1539
1540         ifm = nlmsg_data(nlh);
1541         if (ifm->ifi_index > 0)
1542                 dev = __dev_get_by_index(net, ifm->ifi_index);
1543         else if (tb[IFLA_IFNAME])
1544                 dev = __dev_get_by_name(net, ifname);
1545         else
1546                 return -EINVAL;
1547
1548         if (!dev)
1549                 return -ENODEV;
1550
1551         ops = dev->rtnl_link_ops;
1552         if (!ops)
1553                 return -EOPNOTSUPP;
1554
1555         ops->dellink(dev, &list_kill);
1556         unregister_netdevice_many(&list_kill);
1557         list_del(&list_kill);
1558         return 0;
1559 }
1560
1561 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1562 {
1563         unsigned int old_flags;
1564         int err;
1565
1566         old_flags = dev->flags;
1567         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1568                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1569                 if (err < 0)
1570                         return err;
1571         }
1572
1573         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1574         rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1575
1576         __dev_notify_flags(dev, old_flags);
1577         return 0;
1578 }
1579 EXPORT_SYMBOL(rtnl_configure_link);
1580
1581 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1582         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1583 {
1584         int err;
1585         struct net_device *dev;
1586         unsigned int num_queues = 1;
1587         unsigned int real_num_queues = 1;
1588
1589         if (ops->get_tx_queues) {
1590                 err = ops->get_tx_queues(src_net, tb, &num_queues,
1591                                          &real_num_queues);
1592                 if (err)
1593                         goto err;
1594         }
1595         err = -ENOMEM;
1596         dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1597         if (!dev)
1598                 goto err;
1599
1600         dev_net_set(dev, net);
1601         dev->rtnl_link_ops = ops;
1602         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1603         dev->real_num_tx_queues = real_num_queues;
1604
1605         if (tb[IFLA_MTU])
1606                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1607         if (tb[IFLA_ADDRESS])
1608                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1609                                 nla_len(tb[IFLA_ADDRESS]));
1610         if (tb[IFLA_BROADCAST])
1611                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1612                                 nla_len(tb[IFLA_BROADCAST]));
1613         if (tb[IFLA_TXQLEN])
1614                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1615         if (tb[IFLA_OPERSTATE])
1616                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1617         if (tb[IFLA_LINKMODE])
1618                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1619         if (tb[IFLA_GROUP])
1620                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1621
1622         return dev;
1623
1624 err:
1625         return ERR_PTR(err);
1626 }
1627 EXPORT_SYMBOL(rtnl_create_link);
1628
1629 static int rtnl_group_changelink(struct net *net, int group,
1630                 struct ifinfomsg *ifm,
1631                 struct nlattr **tb)
1632 {
1633         struct net_device *dev;
1634         int err;
1635
1636         for_each_netdev(net, dev) {
1637                 if (dev->group == group) {
1638                         err = do_setlink(dev, ifm, tb, NULL, 0);
1639                         if (err < 0)
1640                                 return err;
1641                 }
1642         }
1643
1644         return 0;
1645 }
1646
1647 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1648 {
1649         struct net *net = sock_net(skb->sk);
1650         const struct rtnl_link_ops *ops;
1651         struct net_device *dev;
1652         struct ifinfomsg *ifm;
1653         char kind[MODULE_NAME_LEN];
1654         char ifname[IFNAMSIZ];
1655         struct nlattr *tb[IFLA_MAX+1];
1656         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1657         int err;
1658
1659 #ifdef CONFIG_MODULES
1660 replay:
1661 #endif
1662         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1663         if (err < 0)
1664                 return err;
1665
1666         if (tb[IFLA_IFNAME])
1667                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1668         else
1669                 ifname[0] = '\0';
1670
1671         ifm = nlmsg_data(nlh);
1672         if (ifm->ifi_index > 0)
1673                 dev = __dev_get_by_index(net, ifm->ifi_index);
1674         else {
1675                 if (ifname[0])
1676                         dev = __dev_get_by_name(net, ifname);
1677                 else
1678                         dev = NULL;
1679         }
1680
1681         err = validate_linkmsg(dev, tb);
1682         if (err < 0)
1683                 return err;
1684
1685         if (tb[IFLA_LINKINFO]) {
1686                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1687                                        tb[IFLA_LINKINFO], ifla_info_policy);
1688                 if (err < 0)
1689                         return err;
1690         } else
1691                 memset(linkinfo, 0, sizeof(linkinfo));
1692
1693         if (linkinfo[IFLA_INFO_KIND]) {
1694                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1695                 ops = rtnl_link_ops_get(kind);
1696         } else {
1697                 kind[0] = '\0';
1698                 ops = NULL;
1699         }
1700
1701         if (1) {
1702                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1703                 struct net *dest_net;
1704
1705                 if (ops) {
1706                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1707                                 err = nla_parse_nested(attr, ops->maxtype,
1708                                                        linkinfo[IFLA_INFO_DATA],
1709                                                        ops->policy);
1710                                 if (err < 0)
1711                                         return err;
1712                                 data = attr;
1713                         }
1714                         if (ops->validate) {
1715                                 err = ops->validate(tb, data);
1716                                 if (err < 0)
1717                                         return err;
1718                         }
1719                 }
1720
1721                 if (dev) {
1722                         int modified = 0;
1723
1724                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1725                                 return -EEXIST;
1726                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1727                                 return -EOPNOTSUPP;
1728
1729                         if (linkinfo[IFLA_INFO_DATA]) {
1730                                 if (!ops || ops != dev->rtnl_link_ops ||
1731                                     !ops->changelink)
1732                                         return -EOPNOTSUPP;
1733
1734                                 err = ops->changelink(dev, tb, data);
1735                                 if (err < 0)
1736                                         return err;
1737                                 modified = 1;
1738                         }
1739
1740                         return do_setlink(dev, ifm, tb, ifname, modified);
1741                 }
1742
1743                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1744                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1745                                 return rtnl_group_changelink(net,
1746                                                 nla_get_u32(tb[IFLA_GROUP]),
1747                                                 ifm, tb);
1748                         return -ENODEV;
1749                 }
1750
1751                 if (ifm->ifi_index)
1752                         return -EOPNOTSUPP;
1753                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1754                         return -EOPNOTSUPP;
1755
1756                 if (!ops) {
1757 #ifdef CONFIG_MODULES
1758                         if (kind[0]) {
1759                                 __rtnl_unlock();
1760                                 request_module("rtnl-link-%s", kind);
1761                                 rtnl_lock();
1762                                 ops = rtnl_link_ops_get(kind);
1763                                 if (ops)
1764                                         goto replay;
1765                         }
1766 #endif
1767                         return -EOPNOTSUPP;
1768                 }
1769
1770                 if (!ifname[0])
1771                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1772
1773                 dest_net = rtnl_link_get_net(net, tb);
1774                 if (IS_ERR(dest_net))
1775                         return PTR_ERR(dest_net);
1776
1777                 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1778
1779                 if (IS_ERR(dev))
1780                         err = PTR_ERR(dev);
1781                 else if (ops->newlink)
1782                         err = ops->newlink(net, dev, tb, data);
1783                 else
1784                         err = register_netdevice(dev);
1785
1786                 if (err < 0 && !IS_ERR(dev))
1787                         free_netdev(dev);
1788                 if (err < 0)
1789                         goto out;
1790
1791                 err = rtnl_configure_link(dev, ifm);
1792                 if (err < 0)
1793                         unregister_netdevice(dev);
1794 out:
1795                 put_net(dest_net);
1796                 return err;
1797         }
1798 }
1799
1800 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1801 {
1802         struct net *net = sock_net(skb->sk);
1803         struct ifinfomsg *ifm;
1804         char ifname[IFNAMSIZ];
1805         struct nlattr *tb[IFLA_MAX+1];
1806         struct net_device *dev = NULL;
1807         struct sk_buff *nskb;
1808         int err;
1809
1810         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1811         if (err < 0)
1812                 return err;
1813
1814         if (tb[IFLA_IFNAME])
1815                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1816
1817         ifm = nlmsg_data(nlh);
1818         if (ifm->ifi_index > 0)
1819                 dev = __dev_get_by_index(net, ifm->ifi_index);
1820         else if (tb[IFLA_IFNAME])
1821                 dev = __dev_get_by_name(net, ifname);
1822         else
1823                 return -EINVAL;
1824
1825         if (dev == NULL)
1826                 return -ENODEV;
1827
1828         nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1829         if (nskb == NULL)
1830                 return -ENOBUFS;
1831
1832         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1833                                nlh->nlmsg_seq, 0, 0);
1834         if (err < 0) {
1835                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1836                 WARN_ON(err == -EMSGSIZE);
1837                 kfree_skb(nskb);
1838         } else
1839                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1840
1841         return err;
1842 }
1843
1844 static u16 rtnl_calcit(struct sk_buff *skb)
1845 {
1846         return min_ifinfo_dump_size;
1847 }
1848
1849 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1850 {
1851         int idx;
1852         int s_idx = cb->family;
1853
1854         if (s_idx == 0)
1855                 s_idx = 1;
1856         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1857                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1858                 if (idx < s_idx || idx == PF_PACKET)
1859                         continue;
1860                 if (rtnl_msg_handlers[idx] == NULL ||
1861                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1862                         continue;
1863                 if (idx > s_idx)
1864                         memset(&cb->args[0], 0, sizeof(cb->args));
1865                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1866                         break;
1867         }
1868         cb->family = idx;
1869
1870         return skb->len;
1871 }
1872
1873 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1874 {
1875         struct net *net = dev_net(dev);
1876         struct sk_buff *skb;
1877         int err = -ENOBUFS;
1878         size_t if_info_size;
1879
1880         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev)), GFP_KERNEL);
1881         if (skb == NULL)
1882                 goto errout;
1883
1884         min_ifinfo_dump_size = max_t(u16, if_info_size, min_ifinfo_dump_size);
1885
1886         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1887         if (err < 0) {
1888                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1889                 WARN_ON(err == -EMSGSIZE);
1890                 kfree_skb(skb);
1891                 goto errout;
1892         }
1893         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1894         return;
1895 errout:
1896         if (err < 0)
1897                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1898 }
1899
1900 /* Protected by RTNL sempahore.  */
1901 static struct rtattr **rta_buf;
1902 static int rtattr_max;
1903
1904 /* Process one rtnetlink message. */
1905
1906 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1907 {
1908         struct net *net = sock_net(skb->sk);
1909         rtnl_doit_func doit;
1910         int sz_idx, kind;
1911         int min_len;
1912         int family;
1913         int type;
1914         int err;
1915
1916         type = nlh->nlmsg_type;
1917         if (type > RTM_MAX)
1918                 return -EOPNOTSUPP;
1919
1920         type -= RTM_BASE;
1921
1922         /* All the messages must have at least 1 byte length */
1923         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1924                 return 0;
1925
1926         family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1927         sz_idx = type>>2;
1928         kind = type&3;
1929
1930         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1931                 return -EPERM;
1932
1933         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1934                 struct sock *rtnl;
1935                 rtnl_dumpit_func dumpit;
1936                 rtnl_calcit_func calcit;
1937                 u16 min_dump_alloc = 0;
1938
1939                 dumpit = rtnl_get_dumpit(family, type);
1940                 if (dumpit == NULL)
1941                         return -EOPNOTSUPP;
1942                 calcit = rtnl_get_calcit(family, type);
1943                 if (calcit)
1944                         min_dump_alloc = calcit(skb);
1945
1946                 __rtnl_unlock();
1947                 rtnl = net->rtnl;
1948                 err = netlink_dump_start(rtnl, skb, nlh, dumpit,
1949                                          NULL, min_dump_alloc);
1950                 rtnl_lock();
1951                 return err;
1952         }
1953
1954         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1955
1956         min_len = rtm_min[sz_idx];
1957         if (nlh->nlmsg_len < min_len)
1958                 return -EINVAL;
1959
1960         if (nlh->nlmsg_len > min_len) {
1961                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1962                 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1963
1964                 while (RTA_OK(attr, attrlen)) {
1965                         unsigned flavor = attr->rta_type;
1966                         if (flavor) {
1967                                 if (flavor > rta_max[sz_idx])
1968                                         return -EINVAL;
1969                                 rta_buf[flavor-1] = attr;
1970                         }
1971                         attr = RTA_NEXT(attr, attrlen);
1972                 }
1973         }
1974
1975         doit = rtnl_get_doit(family, type);
1976         if (doit == NULL)
1977                 return -EOPNOTSUPP;
1978
1979         return doit(skb, nlh, (void *)&rta_buf[0]);
1980 }
1981
1982 static void rtnetlink_rcv(struct sk_buff *skb)
1983 {
1984         rtnl_lock();
1985         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1986         rtnl_unlock();
1987 }
1988
1989 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1990 {
1991         struct net_device *dev = ptr;
1992
1993         switch (event) {
1994         case NETDEV_UP:
1995         case NETDEV_DOWN:
1996         case NETDEV_PRE_UP:
1997         case NETDEV_POST_INIT:
1998         case NETDEV_REGISTER:
1999         case NETDEV_CHANGE:
2000         case NETDEV_PRE_TYPE_CHANGE:
2001         case NETDEV_GOING_DOWN:
2002         case NETDEV_UNREGISTER:
2003         case NETDEV_UNREGISTER_BATCH:
2004         case NETDEV_RELEASE:
2005         case NETDEV_JOIN:
2006                 break;
2007         default:
2008                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2009                 break;
2010         }
2011         return NOTIFY_DONE;
2012 }
2013
2014 static struct notifier_block rtnetlink_dev_notifier = {
2015         .notifier_call  = rtnetlink_event,
2016 };
2017
2018
2019 static int __net_init rtnetlink_net_init(struct net *net)
2020 {
2021         struct sock *sk;
2022         sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2023                                    rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2024         if (!sk)
2025                 return -ENOMEM;
2026         net->rtnl = sk;
2027         return 0;
2028 }
2029
2030 static void __net_exit rtnetlink_net_exit(struct net *net)
2031 {
2032         netlink_kernel_release(net->rtnl);
2033         net->rtnl = NULL;
2034 }
2035
2036 static struct pernet_operations rtnetlink_net_ops = {
2037         .init = rtnetlink_net_init,
2038         .exit = rtnetlink_net_exit,
2039 };
2040
2041 void __init rtnetlink_init(void)
2042 {
2043         int i;
2044
2045         rtattr_max = 0;
2046         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2047                 if (rta_max[i] > rtattr_max)
2048                         rtattr_max = rta_max[i];
2049         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2050         if (!rta_buf)
2051                 panic("rtnetlink_init: cannot allocate rta_buf\n");
2052
2053         if (register_pernet_subsys(&rtnetlink_net_ops))
2054                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2055
2056         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2057         register_netdevice_notifier(&rtnetlink_dev_notifier);
2058
2059         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2060                       rtnl_dump_ifinfo, rtnl_calcit);
2061         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2062         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2063         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2064
2065         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2066         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2067 }
2068