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
  42 #include <linux/inet.h>
  43 #include <linux/netdevice.h>
  44 #include <net/ip.h>
  45 #include <net/protocol.h>
  46 #include <net/arp.h>
  47 #include <net/route.h>
  48 #include <net/udp.h>
  49 #include <net/sock.h>
  50 #include <net/pkt_sched.h>
  51 #include <net/fib_rules.h>
  52 #include <net/rtnetlink.h>
  53 #include <net/net_namespace.h>
  54
  55 struct rtnl_link {
  56         rtnl_doit_func          doit;
  57         rtnl_dumpit_func        dumpit;
  58         rtnl_calcit_func        calcit;
  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 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
 148 {
 149         struct rtnl_link *tab;
 150
 151         if (protocol <= RTNL_FAMILY_MAX)
 152                 tab = rtnl_msg_handlers[protocol];
 153         else
 154                 tab = NULL;
 155
 156         if (tab == NULL || tab[msgindex].calcit == NULL)
 157                 tab = rtnl_msg_handlers[PF_UNSPEC];
 158
 159         return tab ? tab[msgindex].calcit : NULL;
 160 }
 161
 162 /**
 163  * __rtnl_register - Register a rtnetlink message type
 164  * @protocol: Protocol family or PF_UNSPEC
 165  * @msgtype: rtnetlink message type
 166  * @doit: Function pointer called for each request message
 167  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 168  * @calcit: Function pointer to calc size of dump message
 169  *
 170  * Registers the specified function pointers (at least one of them has
 171  * to be non-NULL) to be called whenever a request message for the
 172  * specified protocol family and message type is received.
 173  *
 174  * The special protocol family PF_UNSPEC may be used to define fallback
 175  * function pointers for the case when no entry for the specific protocol
 176  * family exists.
 177  *
 178  * Returns 0 on success or a negative error code.
 179  */
 180 int __rtnl_register(int protocol, int msgtype,
 181                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 182                     rtnl_calcit_func calcit)
 183 {
 184         struct rtnl_link *tab;
 185         int msgindex;
 186
 187         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 188         msgindex = rtm_msgindex(msgtype);
 189
 190         tab = rtnl_msg_handlers[protocol];
 191         if (tab == NULL) {
 192                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 193                 if (tab == NULL)
 194                         return -ENOBUFS;
 195
 196                 rtnl_msg_handlers[protocol] = tab;
 197         }
 198
 199         if (doit)
 200                 tab[msgindex].doit = doit;
 201
 202         if (dumpit)
 203                 tab[msgindex].dumpit = dumpit;
 204
 205         if (calcit)
 206                 tab[msgindex].calcit = calcit;
 207
 208         return 0;
 209 }
 210 EXPORT_SYMBOL_GPL(__rtnl_register);
 211
 212 /**
 213  * rtnl_register - Register a rtnetlink message type
 214  *
 215  * Identical to __rtnl_register() but panics on failure. This is useful
 216  * as failure of this function is very unlikely, it can only happen due
 217  * to lack of memory when allocating the chain to store all message
 218  * handlers for a protocol. Meant for use in init functions where lack
 219  * of memory implies no sense in continuing.
 220  */
 221 void rtnl_register(int protocol, int msgtype,
 222                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 223                    rtnl_calcit_func calcit)
 224 {
 225         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
 226                 panic("Unable to register rtnetlink message handler, "
 227                       "protocol = %d, message type = %d\n",
 228                       protocol, msgtype);
 229 }
 230 EXPORT_SYMBOL_GPL(rtnl_register);
 231
 232 /**
 233  * rtnl_unregister - Unregister a rtnetlink message type
 234  * @protocol: Protocol family or PF_UNSPEC
 235  * @msgtype: rtnetlink message type
 236  *
 237  * Returns 0 on success or a negative error code.
 238  */
 239 int rtnl_unregister(int protocol, int msgtype)
 240 {
 241         int msgindex;
 242
 243         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 244         msgindex = rtm_msgindex(msgtype);
 245
 246         if (rtnl_msg_handlers[protocol] == NULL)
 247                 return -ENOENT;
 248
 249         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 250         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
 251
 252         return 0;
 253 }
 254 EXPORT_SYMBOL_GPL(rtnl_unregister);
 255
 256 /**
 257  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 258  * @protocol : Protocol family or PF_UNSPEC
 259  *
 260  * Identical to calling rtnl_unregster() for all registered message types
 261  * of a certain protocol family.
 262  */
 263 void rtnl_unregister_all(int protocol)
 264 {
 265         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 266
 267         kfree(rtnl_msg_handlers[protocol]);
 268         rtnl_msg_handlers[protocol] = NULL;
 269 }
 270 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 271
 272 static LIST_HEAD(link_ops);
 273
 274 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 275 {
 276         const struct rtnl_link_ops *ops;
 277
 278         list_for_each_entry(ops, &link_ops, list) {
 279                 if (!strcmp(ops->kind, kind))
 280                         return ops;
 281         }
 282         return NULL;
 283 }
 284
 285 /**
 286  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 287  * @ops: struct rtnl_link_ops * to register
 288  *
 289  * The caller must hold the rtnl_mutex. This function should be used
 290  * by drivers that create devices during module initialization. It
 291  * must be called before registering the devices.
 292  *
 293  * Returns 0 on success or a negative error code.
 294  */
 295 int __rtnl_link_register(struct rtnl_link_ops *ops)
 296 {
 297         if (rtnl_link_ops_get(ops->kind))
 298                 return -EEXIST;
 299
 300         if (!ops->dellink)
 301                 ops->dellink = unregister_netdevice_queue;
 302
 303         list_add_tail(&ops->list, &link_ops);
 304         return 0;
 305 }
 306 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 307
 308 /**
 309  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 310  * @ops: struct rtnl_link_ops * to register
 311  *
 312  * Returns 0 on success or a negative error code.
 313  */
 314 int rtnl_link_register(struct rtnl_link_ops *ops)
 315 {
 316         int err;
 317
 318         rtnl_lock();
 319         err = __rtnl_link_register(ops);
 320         rtnl_unlock();
 321         return err;
 322 }
 323 EXPORT_SYMBOL_GPL(rtnl_link_register);
 324
 325 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 326 {
 327         struct net_device *dev;
 328         LIST_HEAD(list_kill);
 329
 330         for_each_netdev(net, dev) {
 331                 if (dev->rtnl_link_ops == ops)
 332                         ops->dellink(dev, &list_kill);
 333         }
 334         unregister_netdevice_many(&list_kill);
 335 }
 336
 337 /**
 338  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 339  * @ops: struct rtnl_link_ops * to unregister
 340  *
 341  * The caller must hold the rtnl_mutex.
 342  */
 343 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 344 {
 345         struct net *net;
 346
 347         for_each_net(net) {
 348                 __rtnl_kill_links(net, ops);
 349         }
 350         list_del(&ops->list);
 351 }
 352 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 353
 354 /**
 355  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 356  * @ops: struct rtnl_link_ops * to unregister
 357  */
 358 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 359 {
 360         rtnl_lock();
 361         __rtnl_link_unregister(ops);
 362         rtnl_unlock();
 363 }
 364 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 365
 366 static size_t rtnl_link_get_size(const struct net_device *dev)
 367 {
 368         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 369         size_t size;
 370
 371         if (!ops)
 372                 return 0;
 373
 374         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 375                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 376
 377         if (ops->get_size)
 378                 /* IFLA_INFO_DATA + nested data */
 379                 size += nla_total_size(sizeof(struct nlattr)) +
 380                         ops->get_size(dev);
 381
 382         if (ops->get_xstats_size)
 383                 /* IFLA_INFO_XSTATS */
 384                 size += nla_total_size(ops->get_xstats_size(dev));
 385
 386         return size;
 387 }
 388
 389 static LIST_HEAD(rtnl_af_ops);
 390
 391 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 392 {
 393         const struct rtnl_af_ops *ops;
 394
 395         list_for_each_entry(ops, &rtnl_af_ops, list) {
 396                 if (ops->family == family)
 397                         return ops;
 398         }
 399
 400         return NULL;
 401 }
 402
 403 /**
 404  * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 405  * @ops: struct rtnl_af_ops * to register
 406  *
 407  * The caller must hold the rtnl_mutex.
 408  *
 409  * Returns 0 on success or a negative error code.
 410  */
 411 int __rtnl_af_register(struct rtnl_af_ops *ops)
 412 {
 413         list_add_tail(&ops->list, &rtnl_af_ops);
 414         return 0;
 415 }
 416 EXPORT_SYMBOL_GPL(__rtnl_af_register);
 417
 418 /**
 419  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 420  * @ops: struct rtnl_af_ops * to register
 421  *
 422  * Returns 0 on success or a negative error code.
 423  */
 424 int rtnl_af_register(struct rtnl_af_ops *ops)
 425 {
 426         int err;
 427
 428         rtnl_lock();
 429         err = __rtnl_af_register(ops);
 430         rtnl_unlock();
 431         return err;
 432 }
 433 EXPORT_SYMBOL_GPL(rtnl_af_register);
 434
 435 /**
 436  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 437  * @ops: struct rtnl_af_ops * to unregister
 438  *
 439  * The caller must hold the rtnl_mutex.
 440  */
 441 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 442 {
 443         list_del(&ops->list);
 444 }
 445 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 446
 447 /**
 448  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 449  * @ops: struct rtnl_af_ops * to unregister
 450  */
 451 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 452 {
 453         rtnl_lock();
 454         __rtnl_af_unregister(ops);
 455         rtnl_unlock();
 456 }
 457 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 458
 459 static size_t rtnl_link_get_af_size(const struct net_device *dev)
 460 {
 461         struct rtnl_af_ops *af_ops;
 462         size_t size;
 463
 464         /* IFLA_AF_SPEC */
 465         size = nla_total_size(sizeof(struct nlattr));
 466
 467         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 468                 if (af_ops->get_link_af_size) {
 469                         /* AF_* + nested data */
 470                         size += nla_total_size(sizeof(struct nlattr)) +
 471                                 af_ops->get_link_af_size(dev);
 472                 }
 473         }
 474
 475         return size;
 476 }
 477
 478 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 479 {
 480         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 481         struct nlattr *linkinfo, *data;
 482         int err = -EMSGSIZE;
 483
 484         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 485         if (linkinfo == NULL)
 486                 goto out;
 487
 488         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 489                 goto err_cancel_link;
 490         if (ops->fill_xstats) {
 491                 err = ops->fill_xstats(skb, dev);
 492                 if (err < 0)
 493                         goto err_cancel_link;
 494         }
 495         if (ops->fill_info) {
 496                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 497                 if (data == NULL)
 498                         goto err_cancel_link;
 499                 err = ops->fill_info(skb, dev);
 500                 if (err < 0)
 501                         goto err_cancel_data;
 502                 nla_nest_end(skb, data);
 503         }
 504
 505         nla_nest_end(skb, linkinfo);
 506         return 0;
 507
 508 err_cancel_data:
 509         nla_nest_cancel(skb, data);
 510 err_cancel_link:
 511         nla_nest_cancel(skb, linkinfo);
 512 out:
 513         return err;
 514 }
 515
 516 static const int rtm_min[RTM_NR_FAMILIES] =
 517 {
 518         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 519         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
 520         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
 521         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
 522         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
 523         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
 524         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
 525         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
 526         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 527         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 528 };
 529
 530 static const int rta_max[RTM_NR_FAMILIES] =
 531 {
 532         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 533         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 534         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 535         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
 536         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 537         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 538         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 539         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 540 };
 541
 542 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 543 {
 544         struct rtattr *rta;
 545         int size = RTA_LENGTH(attrlen);
 546
 547         rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
 548         rta->rta_type = attrtype;
 549         rta->rta_len = size;
 550         memcpy(RTA_DATA(rta), data, attrlen);
 551         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 552 }
 553 EXPORT_SYMBOL(__rta_fill);
 554
 555 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
 556 {
 557         struct sock *rtnl = net->rtnl;
 558         int err = 0;
 559
 560         NETLINK_CB(skb).dst_group = group;
 561         if (echo)
 562                 atomic_inc(&skb->users);
 563         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 564         if (echo)
 565                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 566         return err;
 567 }
 568
 569 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 570 {
 571         struct sock *rtnl = net->rtnl;
 572
 573         return nlmsg_unicast(rtnl, skb, pid);
 574 }
 575 EXPORT_SYMBOL(rtnl_unicast);
 576
 577 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 578                  struct nlmsghdr *nlh, gfp_t flags)
 579 {
 580         struct sock *rtnl = net->rtnl;
 581         int report = 0;
 582
 583         if (nlh)
 584                 report = nlmsg_report(nlh);
 585
 586         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 587 }
 588 EXPORT_SYMBOL(rtnl_notify);
 589
 590 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 591 {
 592         struct sock *rtnl = net->rtnl;
 593
 594         netlink_set_err(rtnl, 0, group, error);
 595 }
 596 EXPORT_SYMBOL(rtnl_set_sk_err);
 597
 598 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 599 {
 600         struct nlattr *mx;
 601         int i, valid = 0;
 602
 603         mx = nla_nest_start(skb, RTA_METRICS);
 604         if (mx == NULL)
 605                 return -ENOBUFS;
 606
 607         for (i = 0; i < RTAX_MAX; i++) {
 608                 if (metrics[i]) {
 609                         valid++;
 610                         NLA_PUT_U32(skb, i+1, metrics[i]);
 611                 }
 612         }
 613
 614         if (!valid) {
 615                 nla_nest_cancel(skb, mx);
 616                 return 0;
 617         }
 618
 619         return nla_nest_end(skb, mx);
 620
 621 nla_put_failure:
 622         nla_nest_cancel(skb, mx);
 623         return -EMSGSIZE;
 624 }
 625 EXPORT_SYMBOL(rtnetlink_put_metrics);
 626
 627 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 628                        u32 ts, u32 tsage, long expires, u32 error)
 629 {
 630         struct rta_cacheinfo ci = {
 631                 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
 632                 .rta_used = dst->__use,
 633                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 634                 .rta_error = error,
 635                 .rta_id =  id,
 636                 .rta_ts = ts,
 637                 .rta_tsage = tsage,
 638         };
 639
 640         if (expires)
 641                 ci.rta_expires = jiffies_to_clock_t(expires);
 642
 643         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 644 }
 645 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 646
 647 static void set_operstate(struct net_device *dev, unsigned char transition)
 648 {
 649         unsigned char operstate = dev->operstate;
 650
 651         switch (transition) {
 652         case IF_OPER_UP:
 653                 if ((operstate == IF_OPER_DORMANT ||
 654                      operstate == IF_OPER_UNKNOWN) &&
 655                     !netif_dormant(dev))
 656                         operstate = IF_OPER_UP;
 657                 break;
 658
 659         case IF_OPER_DORMANT:
 660                 if (operstate == IF_OPER_UP ||
 661                     operstate == IF_OPER_UNKNOWN)
 662                         operstate = IF_OPER_DORMANT;
 663                 break;
 664         }
 665
 666         if (dev->operstate != operstate) {
 667                 write_lock_bh(&dev_base_lock);
 668                 dev->operstate = operstate;
 669                 write_unlock_bh(&dev_base_lock);
 670                 netdev_state_change(dev);
 671         }
 672 }
 673
 674 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 675                                            const struct ifinfomsg *ifm)
 676 {
 677         unsigned int flags = ifm->ifi_flags;
 678
 679         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 680         if (ifm->ifi_change)
 681                 flags = (flags & ifm->ifi_change) |
 682                         (dev->flags & ~ifm->ifi_change);
 683
 684         return flags;
 685 }
 686
 687 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 688                                  const struct rtnl_link_stats64 *b)
 689 {
 690         a->rx_packets = b->rx_packets;
 691         a->tx_packets = b->tx_packets;
 692         a->rx_bytes = b->rx_bytes;
 693         a->tx_bytes = b->tx_bytes;
 694         a->rx_errors = b->rx_errors;
 695         a->tx_errors = b->tx_errors;
 696         a->rx_dropped = b->rx_dropped;
 697         a->tx_dropped = b->tx_dropped;
 698
 699         a->multicast = b->multicast;
 700         a->collisions = b->collisions;
 701
 702         a->rx_length_errors = b->rx_length_errors;
 703         a->rx_over_errors = b->rx_over_errors;
 704         a->rx_crc_errors = b->rx_crc_errors;
 705         a->rx_frame_errors = b->rx_frame_errors;
 706         a->rx_fifo_errors = b->rx_fifo_errors;
 707         a->rx_missed_errors = b->rx_missed_errors;
 708
 709         a->tx_aborted_errors = b->tx_aborted_errors;
 710         a->tx_carrier_errors = b->tx_carrier_errors;
 711         a->tx_fifo_errors = b->tx_fifo_errors;
 712         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 713         a->tx_window_errors = b->tx_window_errors;
 714
 715         a->rx_compressed = b->rx_compressed;
 716         a->tx_compressed = b->tx_compressed;
 717 }
 718
 719 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
 720 {
 721         memcpy(v, b, sizeof(*b));
 722 }
 723
 724 /* All VF info */
 725 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 726                                    u32 ext_filter_mask)
 727 {
 728         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 729             (ext_filter_mask & RTEXT_FILTER_VF)) {
 730                 int num_vfs = dev_num_vf(dev->dev.parent);
 731                 size_t size = nla_total_size(sizeof(struct nlattr));
 732                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 733                 size += num_vfs *
 734                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 735                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 736                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 737                          nla_total_size(sizeof(struct ifla_vf_spoofchk)));
 738                 return size;
 739         } else
 740                 return 0;
 741 }
 742
 743 static size_t rtnl_port_size(const struct net_device *dev)
 744 {
 745         size_t port_size = nla_total_size(4)            /* PORT_VF */
 746                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 747                 + nla_total_size(sizeof(struct ifla_port_vsi))
 748                                                         /* PORT_VSI_TYPE */
 749                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 750                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 751                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 752                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 753         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 754         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 755                 + port_size;
 756         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 757                 + port_size;
 758
 759         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 760                 return 0;
 761         if (dev_num_vf(dev->dev.parent))
 762                 return port_self_size + vf_ports_size +
 763                         vf_port_size * dev_num_vf(dev->dev.parent);
 764         else
 765                 return port_self_size;
 766 }
 767
 768 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 769                                      u32 ext_filter_mask)
 770 {
 771         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 772                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 773                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 774                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 775                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 776                + nla_total_size(sizeof(struct rtnl_link_stats))
 777                + nla_total_size(sizeof(struct rtnl_link_stats64))
 778                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 779                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 780                + nla_total_size(4) /* IFLA_TXQLEN */
 781                + nla_total_size(4) /* IFLA_WEIGHT */
 782                + nla_total_size(4) /* IFLA_MTU */
 783                + nla_total_size(4) /* IFLA_LINK */
 784                + nla_total_size(4) /* IFLA_MASTER */
 785                + nla_total_size(1) /* IFLA_OPERSTATE */
 786                + nla_total_size(1) /* IFLA_LINKMODE */
 787                + nla_total_size(ext_filter_mask
 788                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 789                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 790                + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 791                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 792                + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
 793 }
 794
 795 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 796 {
 797         struct nlattr *vf_ports;
 798         struct nlattr *vf_port;
 799         int vf;
 800         int err;
 801
 802         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 803         if (!vf_ports)
 804                 return -EMSGSIZE;
 805
 806         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 807                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 808                 if (!vf_port)
 809                         goto nla_put_failure;
 810                 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
 811                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 812                 if (err == -EMSGSIZE)
 813                         goto nla_put_failure;
 814                 if (err) {
 815                         nla_nest_cancel(skb, vf_port);
 816                         continue;
 817                 }
 818                 nla_nest_end(skb, vf_port);
 819         }
 820
 821         nla_nest_end(skb, vf_ports);
 822
 823         return 0;
 824
 825 nla_put_failure:
 826         nla_nest_cancel(skb, vf_ports);
 827         return -EMSGSIZE;
 828 }
 829
 830 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 831 {
 832         struct nlattr *port_self;
 833         int err;
 834
 835         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 836         if (!port_self)
 837                 return -EMSGSIZE;
 838
 839         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 840         if (err) {
 841                 nla_nest_cancel(skb, port_self);
 842                 return (err == -EMSGSIZE) ? err : 0;
 843         }
 844
 845         nla_nest_end(skb, port_self);
 846
 847         return 0;
 848 }
 849
 850 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
 851 {
 852         int err;
 853
 854         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 855                 return 0;
 856
 857         err = rtnl_port_self_fill(skb, dev);
 858         if (err)
 859                 return err;
 860
 861         if (dev_num_vf(dev->dev.parent)) {
 862                 err = rtnl_vf_ports_fill(skb, dev);
 863                 if (err)
 864                         return err;
 865         }
 866
 867         return 0;
 868 }
 869
 870 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 871                             int type, u32 pid, u32 seq, u32 change,
 872                             unsigned int flags, u32 ext_filter_mask)
 873 {
 874         struct ifinfomsg *ifm;
 875         struct nlmsghdr *nlh;
 876         struct rtnl_link_stats64 temp;
 877         const struct rtnl_link_stats64 *stats;
 878         struct nlattr *attr, *af_spec;
 879         struct rtnl_af_ops *af_ops;
 880
 881         ASSERT_RTNL();
 882         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 883         if (nlh == NULL)
 884                 return -EMSGSIZE;
 885
 886         ifm = nlmsg_data(nlh);
 887         ifm->ifi_family = AF_UNSPEC;
 888         ifm->__ifi_pad = 0;
 889         ifm->ifi_type = dev->type;
 890         ifm->ifi_index = dev->ifindex;
 891         ifm->ifi_flags = dev_get_flags(dev);
 892         ifm->ifi_change = change;
 893
 894         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 895         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
 896         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 897                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
 898         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
 899         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
 900         NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
 901
 902         if (dev->ifindex != dev->iflink)
 903                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 904
 905         if (dev->master)
 906                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
 907
 908         if (dev->qdisc)
 909                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
 910
 911         if (dev->ifalias)
 912                 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
 913
 914         if (1) {
 915                 struct rtnl_link_ifmap map = {
 916                         .mem_start   = dev->mem_start,
 917                         .mem_end     = dev->mem_end,
 918                         .base_addr   = dev->base_addr,
 919                         .irq         = dev->irq,
 920                         .dma         = dev->dma,
 921                         .port        = dev->if_port,
 922                 };
 923                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 924         }
 925
 926         if (dev->addr_len) {
 927                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 928                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 929         }
 930
 931         attr = nla_reserve(skb, IFLA_STATS,
 932                         sizeof(struct rtnl_link_stats));
 933         if (attr == NULL)
 934                 goto nla_put_failure;
 935
 936         stats = dev_get_stats(dev, &temp);
 937         copy_rtnl_link_stats(nla_data(attr), stats);
 938
 939         attr = nla_reserve(skb, IFLA_STATS64,
 940                         sizeof(struct rtnl_link_stats64));
 941         if (attr == NULL)
 942                 goto nla_put_failure;
 943         copy_rtnl_link_stats64(nla_data(attr), stats);
 944
 945         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF))
 946                 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
 947
 948         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
 949             && (ext_filter_mask & RTEXT_FILTER_VF)) {
 950                 int i;
 951
 952                 struct nlattr *vfinfo, *vf;
 953                 int num_vfs = dev_num_vf(dev->dev.parent);
 954
 955                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
 956                 if (!vfinfo)
 957                         goto nla_put_failure;
 958                 for (i = 0; i < num_vfs; i++) {
 959                         struct ifla_vf_info ivi;
 960                         struct ifla_vf_mac vf_mac;
 961                         struct ifla_vf_vlan vf_vlan;
 962                         struct ifla_vf_tx_rate vf_tx_rate;
 963                         struct ifla_vf_spoofchk vf_spoofchk;
 964
 965                         /*
 966                          * Not all SR-IOV capable drivers support the
 967                          * spoofcheck query.  Preset to -1 so the user
 968                          * space tool can detect that the driver didn't
 969                          * report anything.
 970                          */
 971                         ivi.spoofchk = -1;
 972                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
 973                                 break;
 974                         vf_mac.vf =
 975                                 vf_vlan.vf =
 976                                 vf_tx_rate.vf =
 977                                 vf_spoofchk.vf = ivi.vf;
 978
 979                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
 980                         vf_vlan.vlan = ivi.vlan;
 981                         vf_vlan.qos = ivi.qos;
 982                         vf_tx_rate.rate = ivi.tx_rate;
 983                         vf_spoofchk.setting = ivi.spoofchk;
 984                         vf = nla_nest_start(skb, IFLA_VF_INFO);
 985                         if (!vf) {
 986                                 nla_nest_cancel(skb, vfinfo);
 987                                 goto nla_put_failure;
 988                         }
 989                         NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
 990                         NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
 991                         NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
 992                                 &vf_tx_rate);
 993                         NLA_PUT(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
 994                                 &vf_spoofchk);
 995                         nla_nest_end(skb, vf);
 996                 }
 997                 nla_nest_end(skb, vfinfo);
 998         }
 999
1000         if (rtnl_port_fill(skb, dev))
1001                 goto nla_put_failure;
1002
1003         if (dev->rtnl_link_ops) {
1004                 if (rtnl_link_fill(skb, dev) < 0)
1005                         goto nla_put_failure;
1006         }
1007
1008         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1009                 goto nla_put_failure;
1010
1011         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1012                 if (af_ops->fill_link_af) {
1013                         struct nlattr *af;
1014                         int err;
1015
1016                         if (!(af = nla_nest_start(skb, af_ops->family)))
1017                                 goto nla_put_failure;
1018
1019                         err = af_ops->fill_link_af(skb, dev);
1020
1021                         /*
1022                          * Caller may return ENODATA to indicate that there
1023                          * was no data to be dumped. This is not an error, it
1024                          * means we should trim the attribute header and
1025                          * continue.
1026                          */
1027                         if (err == -ENODATA)
1028                                 nla_nest_cancel(skb, af);
1029                         else if (err < 0)
1030                                 goto nla_put_failure;
1031
1032                         nla_nest_end(skb, af);
1033                 }
1034         }
1035
1036         nla_nest_end(skb, af_spec);
1037
1038         return nlmsg_end(skb, nlh);
1039
1040 nla_put_failure:
1041         nlmsg_cancel(skb, nlh);
1042         return -EMSGSIZE;
1043 }
1044
1045 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1046 {
1047         struct net *net = sock_net(skb->sk);
1048         int h, s_h;
1049         int idx = 0, s_idx;
1050         struct net_device *dev;
1051         struct hlist_head *head;
1052         struct hlist_node *node;
1053         struct nlattr *tb[IFLA_MAX+1];
1054         u32 ext_filter_mask = 0;
1055
1056         s_h = cb->args[0];
1057         s_idx = cb->args[1];
1058
1059         rcu_read_lock();
1060         cb->seq = net->dev_base_seq;
1061
1062         if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1063                         ifla_policy) >= 0) {
1064
1065                 if (tb[IFLA_EXT_MASK])
1066                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1067         }
1068
1069         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1070                 idx = 0;
1071                 head = &net->dev_index_head[h];
1072                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1073                         if (idx < s_idx)
1074                                 goto cont;
1075                         if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1076                                              NETLINK_CB(cb->skb).pid,
1077                                              cb->nlh->nlmsg_seq, 0,
1078                                              NLM_F_MULTI,
1079                                              ext_filter_mask) <= 0)
1080                                 goto out;
1081
1082                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1083 cont:
1084                         idx++;
1085                 }
1086         }
1087 out:
1088         rcu_read_unlock();
1089         cb->args[1] = idx;
1090         cb->args[0] = h;
1091
1092         return skb->len;
1093 }
1094
1095 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1096         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1097         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1098         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1099         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1100         [IFLA_MTU]              = { .type = NLA_U32 },
1101         [IFLA_LINK]             = { .type = NLA_U32 },
1102         [IFLA_MASTER]           = { .type = NLA_U32 },
1103         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1104         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1105         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1106         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1107         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1108         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1109         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1110         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1111         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1112         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1113         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1114         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1115         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1116 };
1117 EXPORT_SYMBOL(ifla_policy);
1118
1119 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1120         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1121         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1122 };
1123
1124 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1125         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1126 };
1127
1128 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1129         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1130                                     .len = sizeof(struct ifla_vf_mac) },
1131         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1132                                     .len = sizeof(struct ifla_vf_vlan) },
1133         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1134                                     .len = sizeof(struct ifla_vf_tx_rate) },
1135         [IFLA_VF_SPOOFCHK]      = { .type = NLA_BINARY,
1136                                     .len = sizeof(struct ifla_vf_spoofchk) },
1137 };
1138
1139 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1140         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1141         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1142                                     .len = PORT_PROFILE_MAX },
1143         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1144                                     .len = sizeof(struct ifla_port_vsi)},
1145         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1146                                       .len = PORT_UUID_MAX },
1147         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1148                                     .len = PORT_UUID_MAX },
1149         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1150         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1151 };
1152
1153 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1154 {
1155         struct net *net;
1156         /* Examine the link attributes and figure out which
1157          * network namespace we are talking about.
1158          */
1159         if (tb[IFLA_NET_NS_PID])
1160                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1161         else if (tb[IFLA_NET_NS_FD])
1162                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1163         else
1164                 net = get_net(src_net);
1165         return net;
1166 }
1167 EXPORT_SYMBOL(rtnl_link_get_net);
1168
1169 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1170 {
1171         if (dev) {
1172                 if (tb[IFLA_ADDRESS] &&
1173                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1174                         return -EINVAL;
1175
1176                 if (tb[IFLA_BROADCAST] &&
1177                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1178                         return -EINVAL;
1179         }
1180
1181         if (tb[IFLA_AF_SPEC]) {
1182                 struct nlattr *af;
1183                 int rem, err;
1184
1185                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1186                         const struct rtnl_af_ops *af_ops;
1187
1188                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1189                                 return -EAFNOSUPPORT;
1190
1191                         if (!af_ops->set_link_af)
1192                                 return -EOPNOTSUPP;
1193
1194                         if (af_ops->validate_link_af) {
1195                                 err = af_ops->validate_link_af(dev, af);
1196                                 if (err < 0)
1197                                         return err;
1198                         }
1199                 }
1200         }
1201
1202         return 0;
1203 }
1204
1205 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1206 {
1207         int rem, err = -EINVAL;
1208         struct nlattr *vf;
1209         const struct net_device_ops *ops = dev->netdev_ops;
1210
1211         nla_for_each_nested(vf, attr, rem) {
1212                 switch (nla_type(vf)) {
1213                 case IFLA_VF_MAC: {
1214                         struct ifla_vf_mac *ivm;
1215                         ivm = nla_data(vf);
1216                         err = -EOPNOTSUPP;
1217                         if (ops->ndo_set_vf_mac)
1218                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1219                                                           ivm->mac);
1220                         break;
1221                 }
1222                 case IFLA_VF_VLAN: {
1223                         struct ifla_vf_vlan *ivv;
1224                         ivv = nla_data(vf);
1225                         err = -EOPNOTSUPP;
1226                         if (ops->ndo_set_vf_vlan)
1227                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1228                                                            ivv->vlan,
1229                                                            ivv->qos);
1230                         break;
1231                 }
1232                 case IFLA_VF_TX_RATE: {
1233                         struct ifla_vf_tx_rate *ivt;
1234                         ivt = nla_data(vf);
1235                         err = -EOPNOTSUPP;
1236                         if (ops->ndo_set_vf_tx_rate)
1237                                 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1238                                                               ivt->rate);
1239                         break;
1240                 }
1241                 case IFLA_VF_SPOOFCHK: {
1242                         struct ifla_vf_spoofchk *ivs;
1243                         ivs = nla_data(vf);
1244                         err = -EOPNOTSUPP;
1245                         if (ops->ndo_set_vf_spoofchk)
1246                                 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1247                                                                ivs->setting);
1248                         break;
1249                 }
1250                 default:
1251                         err = -EINVAL;
1252                         break;
1253                 }
1254                 if (err)
1255                         break;
1256         }
1257         return err;
1258 }
1259
1260 static int do_set_master(struct net_device *dev, int ifindex)
1261 {
1262         struct net_device *master_dev;
1263         const struct net_device_ops *ops;
1264         int err;
1265
1266         if (dev->master) {
1267                 if (dev->master->ifindex == ifindex)
1268                         return 0;
1269                 ops = dev->master->netdev_ops;
1270                 if (ops->ndo_del_slave) {
1271                         err = ops->ndo_del_slave(dev->master, dev);
1272                         if (err)
1273                                 return err;
1274                 } else {
1275                         return -EOPNOTSUPP;
1276                 }
1277         }
1278
1279         if (ifindex) {
1280                 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1281                 if (!master_dev)
1282                         return -EINVAL;
1283                 ops = master_dev->netdev_ops;
1284                 if (ops->ndo_add_slave) {
1285                         err = ops->ndo_add_slave(master_dev, dev);
1286                         if (err)
1287                                 return err;
1288                 } else {
1289                         return -EOPNOTSUPP;
1290                 }
1291         }
1292         return 0;
1293 }
1294
1295 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1296                       struct nlattr **tb, char *ifname, int modified)
1297 {
1298         const struct net_device_ops *ops = dev->netdev_ops;
1299         int send_addr_notify = 0;
1300         int err;
1301
1302         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1303                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1304                 if (IS_ERR(net)) {
1305                         err = PTR_ERR(net);
1306                         goto errout;
1307                 }
1308                 err = dev_change_net_namespace(dev, net, ifname);
1309                 put_net(net);
1310                 if (err)
1311                         goto errout;
1312                 modified = 1;
1313         }
1314
1315         if (tb[IFLA_MAP]) {
1316                 struct rtnl_link_ifmap *u_map;
1317                 struct ifmap k_map;
1318
1319                 if (!ops->ndo_set_config) {
1320                         err = -EOPNOTSUPP;
1321                         goto errout;
1322                 }
1323
1324                 if (!netif_device_present(dev)) {
1325                         err = -ENODEV;
1326                         goto errout;
1327                 }
1328
1329                 u_map = nla_data(tb[IFLA_MAP]);
1330                 k_map.mem_start = (unsigned long) u_map->mem_start;
1331                 k_map.mem_end = (unsigned long) u_map->mem_end;
1332                 k_map.base_addr = (unsigned short) u_map->base_addr;
1333                 k_map.irq = (unsigned char) u_map->irq;
1334                 k_map.dma = (unsigned char) u_map->dma;
1335                 k_map.port = (unsigned char) u_map->port;
1336
1337                 err = ops->ndo_set_config(dev, &k_map);
1338                 if (err < 0)
1339                         goto errout;
1340
1341                 modified = 1;
1342         }
1343
1344         if (tb[IFLA_ADDRESS]) {
1345                 struct sockaddr *sa;
1346                 int len;
1347
1348                 if (!ops->ndo_set_mac_address) {
1349                         err = -EOPNOTSUPP;
1350                         goto errout;
1351                 }
1352
1353                 if (!netif_device_present(dev)) {
1354                         err = -ENODEV;
1355                         goto errout;
1356                 }
1357
1358                 len = sizeof(sa_family_t) + dev->addr_len;
1359                 sa = kmalloc(len, GFP_KERNEL);
1360                 if (!sa) {
1361                         err = -ENOMEM;
1362                         goto errout;
1363                 }
1364                 sa->sa_family = dev->type;
1365                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1366                        dev->addr_len);
1367                 err = ops->ndo_set_mac_address(dev, sa);
1368                 kfree(sa);
1369                 if (err)
1370                         goto errout;
1371                 send_addr_notify = 1;
1372                 modified = 1;
1373         }
1374
1375         if (tb[IFLA_MTU]) {
1376                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1377                 if (err < 0)
1378                         goto errout;
1379                 modified = 1;
1380         }
1381
1382         if (tb[IFLA_GROUP]) {
1383                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1384                 modified = 1;
1385         }
1386
1387         /*
1388          * Interface selected by interface index but interface
1389          * name provided implies that a name change has been
1390          * requested.
1391          */
1392         if (ifm->ifi_index > 0 && ifname[0]) {
1393                 err = dev_change_name(dev, ifname);
1394                 if (err < 0)
1395                         goto errout;
1396                 modified = 1;
1397         }
1398
1399         if (tb[IFLA_IFALIAS]) {
1400                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1401                                     nla_len(tb[IFLA_IFALIAS]));
1402                 if (err < 0)
1403                         goto errout;
1404                 modified = 1;
1405         }
1406
1407         if (tb[IFLA_BROADCAST]) {
1408                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1409                 send_addr_notify = 1;
1410         }
1411
1412         if (ifm->ifi_flags || ifm->ifi_change) {
1413                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1414                 if (err < 0)
1415                         goto errout;
1416         }
1417
1418         if (tb[IFLA_MASTER]) {
1419                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1420                 if (err)
1421                         goto errout;
1422                 modified = 1;
1423         }
1424
1425         if (tb[IFLA_TXQLEN])
1426                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1427
1428         if (tb[IFLA_OPERSTATE])
1429                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1430
1431         if (tb[IFLA_LINKMODE]) {
1432                 write_lock_bh(&dev_base_lock);
1433                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1434                 write_unlock_bh(&dev_base_lock);
1435         }
1436
1437         if (tb[IFLA_VFINFO_LIST]) {
1438                 struct nlattr *attr;
1439                 int rem;
1440                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1441                         if (nla_type(attr) != IFLA_VF_INFO) {
1442                                 err = -EINVAL;
1443                                 goto errout;
1444                         }
1445                         err = do_setvfinfo(dev, attr);
1446                         if (err < 0)
1447                                 goto errout;
1448                         modified = 1;
1449                 }
1450         }
1451         err = 0;
1452
1453         if (tb[IFLA_VF_PORTS]) {
1454                 struct nlattr *port[IFLA_PORT_MAX+1];
1455                 struct nlattr *attr;
1456                 int vf;
1457                 int rem;
1458
1459                 err = -EOPNOTSUPP;
1460                 if (!ops->ndo_set_vf_port)
1461                         goto errout;
1462
1463                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1464                         if (nla_type(attr) != IFLA_VF_PORT)
1465                                 continue;
1466                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1467                                 attr, ifla_port_policy);
1468                         if (err < 0)
1469                                 goto errout;
1470                         if (!port[IFLA_PORT_VF]) {
1471                                 err = -EOPNOTSUPP;
1472                                 goto errout;
1473                         }
1474                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1475                         err = ops->ndo_set_vf_port(dev, vf, port);
1476                         if (err < 0)
1477                                 goto errout;
1478                         modified = 1;
1479                 }
1480         }
1481         err = 0;
1482
1483         if (tb[IFLA_PORT_SELF]) {
1484                 struct nlattr *port[IFLA_PORT_MAX+1];
1485
1486                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1487                         tb[IFLA_PORT_SELF], ifla_port_policy);
1488                 if (err < 0)
1489                         goto errout;
1490
1491                 err = -EOPNOTSUPP;
1492                 if (ops->ndo_set_vf_port)
1493                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1494                 if (err < 0)
1495                         goto errout;
1496                 modified = 1;
1497         }
1498
1499         if (tb[IFLA_AF_SPEC]) {
1500                 struct nlattr *af;
1501                 int rem;
1502
1503                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1504                         const struct rtnl_af_ops *af_ops;
1505
1506                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1507                                 BUG();
1508
1509                         err = af_ops->set_link_af(dev, af);
1510                         if (err < 0)
1511                                 goto errout;
1512
1513                         modified = 1;
1514                 }
1515         }
1516         err = 0;
1517
1518 errout:
1519         if (err < 0 && modified && net_ratelimit())
1520                 printk(KERN_WARNING "A link change request failed with "
1521                        "some changes committed already. Interface %s may "
1522                        "have been left with an inconsistent configuration, "
1523                        "please check.\n", dev->name);
1524
1525         if (send_addr_notify)
1526                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1527
1528         return err;
1529 }
1530
1531 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1532 {
1533         struct net *net = sock_net(skb->sk);
1534         struct ifinfomsg *ifm;
1535         struct net_device *dev;
1536         int err;
1537         struct nlattr *tb[IFLA_MAX+1];
1538         char ifname[IFNAMSIZ];
1539
1540         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1541         if (err < 0)
1542                 goto errout;
1543
1544         if (tb[IFLA_IFNAME])
1545                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1546         else
1547                 ifname[0] = '\0';
1548
1549         err = -EINVAL;
1550         ifm = nlmsg_data(nlh);
1551         if (ifm->ifi_index > 0)
1552                 dev = __dev_get_by_index(net, ifm->ifi_index);
1553         else if (tb[IFLA_IFNAME])
1554                 dev = __dev_get_by_name(net, ifname);
1555         else
1556                 goto errout;
1557
1558         if (dev == NULL) {
1559                 err = -ENODEV;
1560                 goto errout;
1561         }
1562
1563         err = validate_linkmsg(dev, tb);
1564         if (err < 0)
1565                 goto errout;
1566
1567         err = do_setlink(dev, ifm, tb, ifname, 0);
1568 errout:
1569         return err;
1570 }
1571
1572 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1573 {
1574         struct net *net = sock_net(skb->sk);
1575         const struct rtnl_link_ops *ops;
1576         struct net_device *dev;
1577         struct ifinfomsg *ifm;
1578         char ifname[IFNAMSIZ];
1579         struct nlattr *tb[IFLA_MAX+1];
1580         int err;
1581         LIST_HEAD(list_kill);
1582
1583         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1584         if (err < 0)
1585                 return err;
1586
1587         if (tb[IFLA_IFNAME])
1588                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1589
1590         ifm = nlmsg_data(nlh);
1591         if (ifm->ifi_index > 0)
1592                 dev = __dev_get_by_index(net, ifm->ifi_index);
1593         else if (tb[IFLA_IFNAME])
1594                 dev = __dev_get_by_name(net, ifname);
1595         else
1596                 return -EINVAL;
1597
1598         if (!dev)
1599                 return -ENODEV;
1600
1601         ops = dev->rtnl_link_ops;
1602         if (!ops)
1603                 return -EOPNOTSUPP;
1604
1605         ops->dellink(dev, &list_kill);
1606         unregister_netdevice_many(&list_kill);
1607         list_del(&list_kill);
1608         return 0;
1609 }
1610
1611 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1612 {
1613         unsigned int old_flags;
1614         int err;
1615
1616         old_flags = dev->flags;
1617         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1618                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1619                 if (err < 0)
1620                         return err;
1621         }
1622
1623         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1624         rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1625
1626         __dev_notify_flags(dev, old_flags);
1627         return 0;
1628 }
1629 EXPORT_SYMBOL(rtnl_configure_link);
1630
1631 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1632         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1633 {
1634         int err;
1635         struct net_device *dev;
1636         unsigned int num_queues = 1;
1637         unsigned int real_num_queues = 1;
1638
1639         if (ops->get_tx_queues) {
1640                 err = ops->get_tx_queues(src_net, tb, &num_queues,
1641                                          &real_num_queues);
1642                 if (err)
1643                         goto err;
1644         }
1645         err = -ENOMEM;
1646         dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1647         if (!dev)
1648                 goto err;
1649
1650         dev_net_set(dev, net);
1651         dev->rtnl_link_ops = ops;
1652         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1653
1654         if (tb[IFLA_MTU])
1655                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1656         if (tb[IFLA_ADDRESS])
1657                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1658                                 nla_len(tb[IFLA_ADDRESS]));
1659         if (tb[IFLA_BROADCAST])
1660                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1661                                 nla_len(tb[IFLA_BROADCAST]));
1662         if (tb[IFLA_TXQLEN])
1663                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1664         if (tb[IFLA_OPERSTATE])
1665                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1666         if (tb[IFLA_LINKMODE])
1667                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1668         if (tb[IFLA_GROUP])
1669                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1670
1671         return dev;
1672
1673 err:
1674         return ERR_PTR(err);
1675 }
1676 EXPORT_SYMBOL(rtnl_create_link);
1677
1678 static int rtnl_group_changelink(struct net *net, int group,
1679                 struct ifinfomsg *ifm,
1680                 struct nlattr **tb)
1681 {
1682         struct net_device *dev;
1683         int err;
1684
1685         for_each_netdev(net, dev) {
1686                 if (dev->group == group) {
1687                         err = do_setlink(dev, ifm, tb, NULL, 0);
1688                         if (err < 0)
1689                                 return err;
1690                 }
1691         }
1692
1693         return 0;
1694 }
1695
1696 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1697 {
1698         struct net *net = sock_net(skb->sk);
1699         const struct rtnl_link_ops *ops;
1700         struct net_device *dev;
1701         struct ifinfomsg *ifm;
1702         char kind[MODULE_NAME_LEN];
1703         char ifname[IFNAMSIZ];
1704         struct nlattr *tb[IFLA_MAX+1];
1705         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1706         int err;
1707
1708 #ifdef CONFIG_MODULES
1709 replay:
1710 #endif
1711         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1712         if (err < 0)
1713                 return err;
1714
1715         if (tb[IFLA_IFNAME])
1716                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1717         else
1718                 ifname[0] = '\0';
1719
1720         ifm = nlmsg_data(nlh);
1721         if (ifm->ifi_index > 0)
1722                 dev = __dev_get_by_index(net, ifm->ifi_index);
1723         else {
1724                 if (ifname[0])
1725                         dev = __dev_get_by_name(net, ifname);
1726                 else
1727                         dev = NULL;
1728         }
1729
1730         err = validate_linkmsg(dev, tb);
1731         if (err < 0)
1732                 return err;
1733
1734         if (tb[IFLA_LINKINFO]) {
1735                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1736                                        tb[IFLA_LINKINFO], ifla_info_policy);
1737                 if (err < 0)
1738                         return err;
1739         } else
1740                 memset(linkinfo, 0, sizeof(linkinfo));
1741
1742         if (linkinfo[IFLA_INFO_KIND]) {
1743                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1744                 ops = rtnl_link_ops_get(kind);
1745         } else {
1746                 kind[0] = '\0';
1747                 ops = NULL;
1748         }
1749
1750         if (1) {
1751                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1752                 struct net *dest_net;
1753
1754                 if (ops) {
1755                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1756                                 err = nla_parse_nested(attr, ops->maxtype,
1757                                                        linkinfo[IFLA_INFO_DATA],
1758                                                        ops->policy);
1759                                 if (err < 0)
1760                                         return err;
1761                                 data = attr;
1762                         }
1763                         if (ops->validate) {
1764                                 err = ops->validate(tb, data);
1765                                 if (err < 0)
1766                                         return err;
1767                         }
1768                 }
1769
1770                 if (dev) {
1771                         int modified = 0;
1772
1773                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1774                                 return -EEXIST;
1775                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1776                                 return -EOPNOTSUPP;
1777
1778                         if (linkinfo[IFLA_INFO_DATA]) {
1779                                 if (!ops || ops != dev->rtnl_link_ops ||
1780                                     !ops->changelink)
1781                                         return -EOPNOTSUPP;
1782
1783                                 err = ops->changelink(dev, tb, data);
1784                                 if (err < 0)
1785                                         return err;
1786                                 modified = 1;
1787                         }
1788
1789                         return do_setlink(dev, ifm, tb, ifname, modified);
1790                 }
1791
1792                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1793                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1794                                 return rtnl_group_changelink(net,
1795                                                 nla_get_u32(tb[IFLA_GROUP]),
1796                                                 ifm, tb);
1797                         return -ENODEV;
1798                 }
1799
1800                 if (ifm->ifi_index)
1801                         return -EOPNOTSUPP;
1802                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1803                         return -EOPNOTSUPP;
1804
1805                 if (!ops) {
1806 #ifdef CONFIG_MODULES
1807                         if (kind[0]) {
1808                                 __rtnl_unlock();
1809                                 request_module("rtnl-link-%s", kind);
1810                                 rtnl_lock();
1811                                 ops = rtnl_link_ops_get(kind);
1812                                 if (ops)
1813                                         goto replay;
1814                         }
1815 #endif
1816                         return -EOPNOTSUPP;
1817                 }
1818
1819                 if (!ifname[0])
1820                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1821
1822                 dest_net = rtnl_link_get_net(net, tb);
1823                 if (IS_ERR(dest_net))
1824                         return PTR_ERR(dest_net);
1825
1826                 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1827
1828                 if (IS_ERR(dev))
1829                         err = PTR_ERR(dev);
1830                 else if (ops->newlink)
1831                         err = ops->newlink(net, dev, tb, data);
1832                 else
1833                         err = register_netdevice(dev);
1834
1835                 if (err < 0 && !IS_ERR(dev))
1836                         free_netdev(dev);
1837                 if (err < 0)
1838                         goto out;
1839
1840                 err = rtnl_configure_link(dev, ifm);
1841                 if (err < 0)
1842                         unregister_netdevice(dev);
1843 out:
1844                 put_net(dest_net);
1845                 return err;
1846         }
1847 }
1848
1849 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1850 {
1851         struct net *net = sock_net(skb->sk);
1852         struct ifinfomsg *ifm;
1853         char ifname[IFNAMSIZ];
1854         struct nlattr *tb[IFLA_MAX+1];
1855         struct net_device *dev = NULL;
1856         struct sk_buff *nskb;
1857         int err;
1858         u32 ext_filter_mask = 0;
1859
1860         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1861         if (err < 0)
1862                 return err;
1863
1864         if (tb[IFLA_IFNAME])
1865                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1866
1867         if (tb[IFLA_EXT_MASK])
1868                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1869
1870         ifm = nlmsg_data(nlh);
1871         if (ifm->ifi_index > 0)
1872                 dev = __dev_get_by_index(net, ifm->ifi_index);
1873         else if (tb[IFLA_IFNAME])
1874                 dev = __dev_get_by_name(net, ifname);
1875         else
1876                 return -EINVAL;
1877
1878         if (dev == NULL)
1879                 return -ENODEV;
1880
1881         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1882         if (nskb == NULL)
1883                 return -ENOBUFS;
1884
1885         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1886                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1887         if (err < 0) {
1888                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1889                 WARN_ON(err == -EMSGSIZE);
1890                 kfree_skb(nskb);
1891         } else
1892                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1893
1894         return err;
1895 }
1896
1897 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1898 {
1899         struct net *net = sock_net(skb->sk);
1900         struct net_device *dev;
1901         struct nlattr *tb[IFLA_MAX+1];
1902         u32 ext_filter_mask = 0;
1903         u16 min_ifinfo_dump_size = 0;
1904
1905         if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1906                         ifla_policy) >= 0) {
1907                 if (tb[IFLA_EXT_MASK])
1908                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1909         }
1910
1911         if (!ext_filter_mask)
1912                 return NLMSG_GOODSIZE;
1913         /*
1914          * traverse the list of net devices and compute the minimum
1915          * buffer size based upon the filter mask.
1916          */
1917         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1918                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1919                                              if_nlmsg_size(dev,
1920                                                            ext_filter_mask));
1921         }
1922
1923         return min_ifinfo_dump_size;
1924 }
1925
1926 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1927 {
1928         int idx;
1929         int s_idx = cb->family;
1930
1931         if (s_idx == 0)
1932                 s_idx = 1;
1933         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1934                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1935                 if (idx < s_idx || idx == PF_PACKET)
1936                         continue;
1937                 if (rtnl_msg_handlers[idx] == NULL ||
1938                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1939                         continue;
1940                 if (idx > s_idx)
1941                         memset(&cb->args[0], 0, sizeof(cb->args));
1942                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1943                         break;
1944         }
1945         cb->family = idx;
1946
1947         return skb->len;
1948 }
1949
1950 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1951 {
1952         struct net *net = dev_net(dev);
1953         struct sk_buff *skb;
1954         int err = -ENOBUFS;
1955         size_t if_info_size;
1956
1957         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1958         if (skb == NULL)
1959                 goto errout;
1960
1961         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1962         if (err < 0) {
1963                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1964                 WARN_ON(err == -EMSGSIZE);
1965                 kfree_skb(skb);
1966                 goto errout;
1967         }
1968         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1969         return;
1970 errout:
1971         if (err < 0)
1972                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1973 }
1974
1975 /* Protected by RTNL sempahore.  */
1976 static struct rtattr **rta_buf;
1977 static int rtattr_max;
1978
1979 /* Process one rtnetlink message. */
1980
1981 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1982 {
1983         struct net *net = sock_net(skb->sk);
1984         rtnl_doit_func doit;
1985         int sz_idx, kind;
1986         int min_len;
1987         int family;
1988         int type;
1989         int err;
1990
1991         type = nlh->nlmsg_type;
1992         if (type > RTM_MAX)
1993                 return -EOPNOTSUPP;
1994
1995         type -= RTM_BASE;
1996
1997         /* All the messages must have at least 1 byte length */
1998         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1999                 return 0;
2000
2001         family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
2002         sz_idx = type>>2;
2003         kind = type&3;
2004
2005         if (kind != 2 && !capable(CAP_NET_ADMIN))
2006                 return -EPERM;
2007
2008         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2009                 struct sock *rtnl;
2010                 rtnl_dumpit_func dumpit;
2011                 rtnl_calcit_func calcit;
2012                 u16 min_dump_alloc = 0;
2013
2014                 dumpit = rtnl_get_dumpit(family, type);
2015                 if (dumpit == NULL)
2016                         return -EOPNOTSUPP;
2017                 calcit = rtnl_get_calcit(family, type);
2018                 if (calcit)
2019                         min_dump_alloc = calcit(skb, nlh);
2020
2021                 __rtnl_unlock();
2022                 rtnl = net->rtnl;
2023                 {
2024                         struct netlink_dump_control c = {
2025                                 .dump           = dumpit,
2026                                 .min_dump_alloc = min_dump_alloc,
2027                         };
2028                         err = netlink_dump_start(rtnl, skb, nlh, &c);
2029                 }
2030                 rtnl_lock();
2031                 return err;
2032         }
2033
2034         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
2035
2036         min_len = rtm_min[sz_idx];
2037         if (nlh->nlmsg_len < min_len)
2038                 return -EINVAL;
2039
2040         if (nlh->nlmsg_len > min_len) {
2041                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
2042                 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
2043
2044                 while (RTA_OK(attr, attrlen)) {
2045                         unsigned flavor = attr->rta_type;
2046                         if (flavor) {
2047                                 if (flavor > rta_max[sz_idx])
2048                                         return -EINVAL;
2049                                 rta_buf[flavor-1] = attr;
2050                         }
2051                         attr = RTA_NEXT(attr, attrlen);
2052                 }
2053         }
2054
2055         doit = rtnl_get_doit(family, type);
2056         if (doit == NULL)
2057                 return -EOPNOTSUPP;
2058
2059         return doit(skb, nlh, (void *)&rta_buf[0]);
2060 }
2061
2062 static void rtnetlink_rcv(struct sk_buff *skb)
2063 {
2064         rtnl_lock();
2065         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2066         rtnl_unlock();
2067 }
2068
2069 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2070 {
2071         struct net_device *dev = ptr;
2072
2073         switch (event) {
2074         case NETDEV_UP:
2075         case NETDEV_DOWN:
2076         case NETDEV_PRE_UP:
2077         case NETDEV_POST_INIT:
2078         case NETDEV_REGISTER:
2079         case NETDEV_CHANGE:
2080         case NETDEV_PRE_TYPE_CHANGE:
2081         case NETDEV_GOING_DOWN:
2082         case NETDEV_UNREGISTER:
2083         case NETDEV_UNREGISTER_BATCH:
2084         case NETDEV_RELEASE:
2085         case NETDEV_JOIN:
2086                 break;
2087         default:
2088                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2089                 break;
2090         }
2091         return NOTIFY_DONE;
2092 }
2093
2094 static struct notifier_block rtnetlink_dev_notifier = {
2095         .notifier_call  = rtnetlink_event,
2096 };
2097
2098
2099 static int __net_init rtnetlink_net_init(struct net *net)
2100 {
2101         struct sock *sk;
2102         sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2103                                    rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2104         if (!sk)
2105                 return -ENOMEM;
2106         net->rtnl = sk;
2107         return 0;
2108 }
2109
2110 static void __net_exit rtnetlink_net_exit(struct net *net)
2111 {
2112         netlink_kernel_release(net->rtnl);
2113         net->rtnl = NULL;
2114 }
2115
2116 static struct pernet_operations rtnetlink_net_ops = {
2117         .init = rtnetlink_net_init,
2118         .exit = rtnetlink_net_exit,
2119 };
2120
2121 void __init rtnetlink_init(void)
2122 {
2123         int i;
2124
2125         rtattr_max = 0;
2126         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2127                 if (rta_max[i] > rtattr_max)
2128                         rtattr_max = rta_max[i];
2129         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2130         if (!rta_buf)
2131                 panic("rtnetlink_init: cannot allocate rta_buf\n");
2132
2133         if (register_pernet_subsys(&rtnetlink_net_ops))
2134                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2135
2136         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2137         register_netdevice_notifier(&rtnetlink_dev_notifier);
2138
2139         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2140                       rtnl_dump_ifinfo, rtnl_calcit);
2141         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2142         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2143         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2144
2145         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2146         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2147 }
2148