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
  64 void rtnl_lock(void)
  65 {
  66         mutex_lock(&rtnl_mutex);
  67 }
  68 EXPORT_SYMBOL(rtnl_lock);
  69
  70 void __rtnl_unlock(void)
  71 {
  72         mutex_unlock(&rtnl_mutex);
  73 }
  74
  75 void rtnl_unlock(void)
  76 {
  77         /* This fellow will unlock it for us. */
  78         netdev_run_todo();
  79 }
  80 EXPORT_SYMBOL(rtnl_unlock);
  81
  82 int rtnl_trylock(void)
  83 {
  84         return mutex_trylock(&rtnl_mutex);
  85 }
  86 EXPORT_SYMBOL(rtnl_trylock);
  87
  88 int rtnl_is_locked(void)
  89 {
  90         return mutex_is_locked(&rtnl_mutex);
  91 }
  92 EXPORT_SYMBOL(rtnl_is_locked);
  93
  94 #ifdef CONFIG_PROVE_LOCKING
  95 int lockdep_rtnl_is_held(void)
  96 {
  97         return lockdep_is_held(&rtnl_mutex);
  98 }
  99 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 100 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 101
 102 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 103
 104 static inline int rtm_msgindex(int msgtype)
 105 {
 106         int msgindex = msgtype - RTM_BASE;
 107
 108         /*
 109          * msgindex < 0 implies someone tried to register a netlink
 110          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 111          * the message type has not been added to linux/rtnetlink.h
 112          */
 113         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 114
 115         return msgindex;
 116 }
 117
 118 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
 119 {
 120         struct rtnl_link *tab;
 121
 122         if (protocol <= RTNL_FAMILY_MAX)
 123                 tab = rtnl_msg_handlers[protocol];
 124         else
 125                 tab = NULL;
 126
 127         if (tab == NULL || tab[msgindex].doit == NULL)
 128                 tab = rtnl_msg_handlers[PF_UNSPEC];
 129
 130         return tab ? tab[msgindex].doit : NULL;
 131 }
 132
 133 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
 134 {
 135         struct rtnl_link *tab;
 136
 137         if (protocol <= RTNL_FAMILY_MAX)
 138                 tab = rtnl_msg_handlers[protocol];
 139         else
 140                 tab = NULL;
 141
 142         if (tab == NULL || tab[msgindex].dumpit == NULL)
 143                 tab = rtnl_msg_handlers[PF_UNSPEC];
 144
 145         return tab ? tab[msgindex].dumpit : NULL;
 146 }
 147
 148 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
 149 {
 150         struct rtnl_link *tab;
 151
 152         if (protocol <= RTNL_FAMILY_MAX)
 153                 tab = rtnl_msg_handlers[protocol];
 154         else
 155                 tab = NULL;
 156
 157         if (tab == NULL || tab[msgindex].calcit == NULL)
 158                 tab = rtnl_msg_handlers[PF_UNSPEC];
 159
 160         return tab ? tab[msgindex].calcit : NULL;
 161 }
 162
 163 /**
 164  * __rtnl_register - Register a rtnetlink message type
 165  * @protocol: Protocol family or PF_UNSPEC
 166  * @msgtype: rtnetlink message type
 167  * @doit: Function pointer called for each request message
 168  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 169  * @calcit: Function pointer to calc size of dump message
 170  *
 171  * Registers the specified function pointers (at least one of them has
 172  * to be non-NULL) to be called whenever a request message for the
 173  * specified protocol family and message type is received.
 174  *
 175  * The special protocol family PF_UNSPEC may be used to define fallback
 176  * function pointers for the case when no entry for the specific protocol
 177  * family exists.
 178  *
 179  * Returns 0 on success or a negative error code.
 180  */
 181 int __rtnl_register(int protocol, int msgtype,
 182                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 183                     rtnl_calcit_func calcit)
 184 {
 185         struct rtnl_link *tab;
 186         int msgindex;
 187
 188         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 189         msgindex = rtm_msgindex(msgtype);
 190
 191         tab = rtnl_msg_handlers[protocol];
 192         if (tab == NULL) {
 193                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 194                 if (tab == NULL)
 195                         return -ENOBUFS;
 196
 197                 rtnl_msg_handlers[protocol] = tab;
 198         }
 199
 200         if (doit)
 201                 tab[msgindex].doit = doit;
 202
 203         if (dumpit)
 204                 tab[msgindex].dumpit = dumpit;
 205
 206         if (calcit)
 207                 tab[msgindex].calcit = calcit;
 208
 209         return 0;
 210 }
 211 EXPORT_SYMBOL_GPL(__rtnl_register);
 212
 213 /**
 214  * rtnl_register - Register a rtnetlink message type
 215  *
 216  * Identical to __rtnl_register() but panics on failure. This is useful
 217  * as failure of this function is very unlikely, it can only happen due
 218  * to lack of memory when allocating the chain to store all message
 219  * handlers for a protocol. Meant for use in init functions where lack
 220  * of memory implies no sense in continuing.
 221  */
 222 void rtnl_register(int protocol, int msgtype,
 223                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 224                    rtnl_calcit_func calcit)
 225 {
 226         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
 227                 panic("Unable to register rtnetlink message handler, "
 228                       "protocol = %d, message type = %d\n",
 229                       protocol, msgtype);
 230 }
 231 EXPORT_SYMBOL_GPL(rtnl_register);
 232
 233 /**
 234  * rtnl_unregister - Unregister a rtnetlink message type
 235  * @protocol: Protocol family or PF_UNSPEC
 236  * @msgtype: rtnetlink message type
 237  *
 238  * Returns 0 on success or a negative error code.
 239  */
 240 int rtnl_unregister(int protocol, int msgtype)
 241 {
 242         int msgindex;
 243
 244         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 245         msgindex = rtm_msgindex(msgtype);
 246
 247         if (rtnl_msg_handlers[protocol] == NULL)
 248                 return -ENOENT;
 249
 250         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 251         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
 252
 253         return 0;
 254 }
 255 EXPORT_SYMBOL_GPL(rtnl_unregister);
 256
 257 /**
 258  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 259  * @protocol : Protocol family or PF_UNSPEC
 260  *
 261  * Identical to calling rtnl_unregster() for all registered message types
 262  * of a certain protocol family.
 263  */
 264 void rtnl_unregister_all(int protocol)
 265 {
 266         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 267
 268         kfree(rtnl_msg_handlers[protocol]);
 269         rtnl_msg_handlers[protocol] = NULL;
 270 }
 271 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 272
 273 static LIST_HEAD(link_ops);
 274
 275 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 276 {
 277         const struct rtnl_link_ops *ops;
 278
 279         list_for_each_entry(ops, &link_ops, list) {
 280                 if (!strcmp(ops->kind, kind))
 281                         return ops;
 282         }
 283         return NULL;
 284 }
 285
 286 /**
 287  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 288  * @ops: struct rtnl_link_ops * to register
 289  *
 290  * The caller must hold the rtnl_mutex. This function should be used
 291  * by drivers that create devices during module initialization. It
 292  * must be called before registering the devices.
 293  *
 294  * Returns 0 on success or a negative error code.
 295  */
 296 int __rtnl_link_register(struct rtnl_link_ops *ops)
 297 {
 298         if (rtnl_link_ops_get(ops->kind))
 299                 return -EEXIST;
 300
 301         if (!ops->dellink)
 302                 ops->dellink = unregister_netdevice_queue;
 303
 304         list_add_tail(&ops->list, &link_ops);
 305         return 0;
 306 }
 307 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 308
 309 /**
 310  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 311  * @ops: struct rtnl_link_ops * to register
 312  *
 313  * Returns 0 on success or a negative error code.
 314  */
 315 int rtnl_link_register(struct rtnl_link_ops *ops)
 316 {
 317         int err;
 318
 319         rtnl_lock();
 320         err = __rtnl_link_register(ops);
 321         rtnl_unlock();
 322         return err;
 323 }
 324 EXPORT_SYMBOL_GPL(rtnl_link_register);
 325
 326 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 327 {
 328         struct net_device *dev;
 329         LIST_HEAD(list_kill);
 330
 331         for_each_netdev(net, dev) {
 332                 if (dev->rtnl_link_ops == ops)
 333                         ops->dellink(dev, &list_kill);
 334         }
 335         unregister_netdevice_many(&list_kill);
 336 }
 337
 338 /**
 339  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 340  * @ops: struct rtnl_link_ops * to unregister
 341  *
 342  * The caller must hold the rtnl_mutex.
 343  */
 344 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 345 {
 346         struct net *net;
 347
 348         for_each_net(net) {
 349                 __rtnl_kill_links(net, ops);
 350         }
 351         list_del(&ops->list);
 352 }
 353 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 354
 355 /**
 356  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 357  * @ops: struct rtnl_link_ops * to unregister
 358  */
 359 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 360 {
 361         rtnl_lock();
 362         __rtnl_link_unregister(ops);
 363         rtnl_unlock();
 364 }
 365 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 366
 367 static size_t rtnl_link_get_size(const struct net_device *dev)
 368 {
 369         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 370         size_t size;
 371
 372         if (!ops)
 373                 return 0;
 374
 375         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 376                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 377
 378         if (ops->get_size)
 379                 /* IFLA_INFO_DATA + nested data */
 380                 size += nla_total_size(sizeof(struct nlattr)) +
 381                         ops->get_size(dev);
 382
 383         if (ops->get_xstats_size)
 384                 /* IFLA_INFO_XSTATS */
 385                 size += nla_total_size(ops->get_xstats_size(dev));
 386
 387         return size;
 388 }
 389
 390 static LIST_HEAD(rtnl_af_ops);
 391
 392 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 393 {
 394         const struct rtnl_af_ops *ops;
 395
 396         list_for_each_entry(ops, &rtnl_af_ops, list) {
 397                 if (ops->family == family)
 398                         return ops;
 399         }
 400
 401         return NULL;
 402 }
 403
 404 /**
 405  * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 406  * @ops: struct rtnl_af_ops * to register
 407  *
 408  * The caller must hold the rtnl_mutex.
 409  *
 410  * Returns 0 on success or a negative error code.
 411  */
 412 int __rtnl_af_register(struct rtnl_af_ops *ops)
 413 {
 414         list_add_tail(&ops->list, &rtnl_af_ops);
 415         return 0;
 416 }
 417 EXPORT_SYMBOL_GPL(__rtnl_af_register);
 418
 419 /**
 420  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 421  * @ops: struct rtnl_af_ops * to register
 422  *
 423  * Returns 0 on success or a negative error code.
 424  */
 425 int rtnl_af_register(struct rtnl_af_ops *ops)
 426 {
 427         int err;
 428
 429         rtnl_lock();
 430         err = __rtnl_af_register(ops);
 431         rtnl_unlock();
 432         return err;
 433 }
 434 EXPORT_SYMBOL_GPL(rtnl_af_register);
 435
 436 /**
 437  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 438  * @ops: struct rtnl_af_ops * to unregister
 439  *
 440  * The caller must hold the rtnl_mutex.
 441  */
 442 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 443 {
 444         list_del(&ops->list);
 445 }
 446 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 447
 448 /**
 449  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 450  * @ops: struct rtnl_af_ops * to unregister
 451  */
 452 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 453 {
 454         rtnl_lock();
 455         __rtnl_af_unregister(ops);
 456         rtnl_unlock();
 457 }
 458 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 459
 460 static size_t rtnl_link_get_af_size(const struct net_device *dev)
 461 {
 462         struct rtnl_af_ops *af_ops;
 463         size_t size;
 464
 465         /* IFLA_AF_SPEC */
 466         size = nla_total_size(sizeof(struct nlattr));
 467
 468         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 469                 if (af_ops->get_link_af_size) {
 470                         /* AF_* + nested data */
 471                         size += nla_total_size(sizeof(struct nlattr)) +
 472                                 af_ops->get_link_af_size(dev);
 473                 }
 474         }
 475
 476         return size;
 477 }
 478
 479 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 480 {
 481         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 482         struct nlattr *linkinfo, *data;
 483         int err = -EMSGSIZE;
 484
 485         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 486         if (linkinfo == NULL)
 487                 goto out;
 488
 489         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 490                 goto err_cancel_link;
 491         if (ops->fill_xstats) {
 492                 err = ops->fill_xstats(skb, dev);
 493                 if (err < 0)
 494                         goto err_cancel_link;
 495         }
 496         if (ops->fill_info) {
 497                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 498                 if (data == NULL)
 499                         goto err_cancel_link;
 500                 err = ops->fill_info(skb, dev);
 501                 if (err < 0)
 502                         goto err_cancel_data;
 503                 nla_nest_end(skb, data);
 504         }
 505
 506         nla_nest_end(skb, linkinfo);
 507         return 0;
 508
 509 err_cancel_data:
 510         nla_nest_cancel(skb, data);
 511 err_cancel_link:
 512         nla_nest_cancel(skb, linkinfo);
 513 out:
 514         return err;
 515 }
 516
 517 static const int rtm_min[RTM_NR_FAMILIES] =
 518 {
 519         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 520         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
 521         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
 522         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
 523         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
 524         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
 525         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
 526         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
 527         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 528         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 529 };
 530
 531 static const int rta_max[RTM_NR_FAMILIES] =
 532 {
 533         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 534         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 535         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 536         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
 537         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 538         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 539         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 540         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 541 };
 542
 543 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 544 {
 545         struct rtattr *rta;
 546         int size = RTA_LENGTH(attrlen);
 547
 548         rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
 549         rta->rta_type = attrtype;
 550         rta->rta_len = size;
 551         memcpy(RTA_DATA(rta), data, attrlen);
 552         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 553 }
 554 EXPORT_SYMBOL(__rta_fill);
 555
 556 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
 557 {
 558         struct sock *rtnl = net->rtnl;
 559         int err = 0;
 560
 561         NETLINK_CB(skb).dst_group = group;
 562         if (echo)
 563                 atomic_inc(&skb->users);
 564         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 565         if (echo)
 566                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 567         return err;
 568 }
 569
 570 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 571 {
 572         struct sock *rtnl = net->rtnl;
 573
 574         return nlmsg_unicast(rtnl, skb, pid);
 575 }
 576 EXPORT_SYMBOL(rtnl_unicast);
 577
 578 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 579                  struct nlmsghdr *nlh, gfp_t flags)
 580 {
 581         struct sock *rtnl = net->rtnl;
 582         int report = 0;
 583
 584         if (nlh)
 585                 report = nlmsg_report(nlh);
 586
 587         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 588 }
 589 EXPORT_SYMBOL(rtnl_notify);
 590
 591 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 592 {
 593         struct sock *rtnl = net->rtnl;
 594
 595         netlink_set_err(rtnl, 0, group, error);
 596 }
 597 EXPORT_SYMBOL(rtnl_set_sk_err);
 598
 599 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 600 {
 601         struct nlattr *mx;
 602         int i, valid = 0;
 603
 604         mx = nla_nest_start(skb, RTA_METRICS);
 605         if (mx == NULL)
 606                 return -ENOBUFS;
 607
 608         for (i = 0; i < RTAX_MAX; i++) {
 609                 if (metrics[i]) {
 610                         valid++;
 611                         NLA_PUT_U32(skb, i+1, metrics[i]);
 612                 }
 613         }
 614
 615         if (!valid) {
 616                 nla_nest_cancel(skb, mx);
 617                 return 0;
 618         }
 619
 620         return nla_nest_end(skb, mx);
 621
 622 nla_put_failure:
 623         nla_nest_cancel(skb, mx);
 624         return -EMSGSIZE;
 625 }
 626 EXPORT_SYMBOL(rtnetlink_put_metrics);
 627
 628 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 629                        u32 ts, u32 tsage, long expires, u32 error)
 630 {
 631         struct rta_cacheinfo ci = {
 632                 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
 633                 .rta_used = dst->__use,
 634                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 635                 .rta_error = error,
 636                 .rta_id =  id,
 637                 .rta_ts = ts,
 638                 .rta_tsage = tsage,
 639         };
 640
 641         if (expires)
 642                 ci.rta_expires = jiffies_to_clock_t(expires);
 643
 644         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 645 }
 646 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 647
 648 static void set_operstate(struct net_device *dev, unsigned char transition)
 649 {
 650         unsigned char operstate = dev->operstate;
 651
 652         switch (transition) {
 653         case IF_OPER_UP:
 654                 if ((operstate == IF_OPER_DORMANT ||
 655                      operstate == IF_OPER_UNKNOWN) &&
 656                     !netif_dormant(dev))
 657                         operstate = IF_OPER_UP;
 658                 break;
 659
 660         case IF_OPER_DORMANT:
 661                 if (operstate == IF_OPER_UP ||
 662                     operstate == IF_OPER_UNKNOWN)
 663                         operstate = IF_OPER_DORMANT;
 664                 break;
 665         }
 666
 667         if (dev->operstate != operstate) {
 668                 write_lock_bh(&dev_base_lock);
 669                 dev->operstate = operstate;
 670                 write_unlock_bh(&dev_base_lock);
 671                 netdev_state_change(dev);
 672         }
 673 }
 674
 675 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 676                                            const struct ifinfomsg *ifm)
 677 {
 678         unsigned int flags = ifm->ifi_flags;
 679
 680         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 681         if (ifm->ifi_change)
 682                 flags = (flags & ifm->ifi_change) |
 683                         (dev->flags & ~ifm->ifi_change);
 684
 685         return flags;
 686 }
 687
 688 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 689                                  const struct rtnl_link_stats64 *b)
 690 {
 691         a->rx_packets = b->rx_packets;
 692         a->tx_packets = b->tx_packets;
 693         a->rx_bytes = b->rx_bytes;
 694         a->tx_bytes = b->tx_bytes;
 695         a->rx_errors = b->rx_errors;
 696         a->tx_errors = b->tx_errors;
 697         a->rx_dropped = b->rx_dropped;
 698         a->tx_dropped = b->tx_dropped;
 699
 700         a->multicast = b->multicast;
 701         a->collisions = b->collisions;
 702
 703         a->rx_length_errors = b->rx_length_errors;
 704         a->rx_over_errors = b->rx_over_errors;
 705         a->rx_crc_errors = b->rx_crc_errors;
 706         a->rx_frame_errors = b->rx_frame_errors;
 707         a->rx_fifo_errors = b->rx_fifo_errors;
 708         a->rx_missed_errors = b->rx_missed_errors;
 709
 710         a->tx_aborted_errors = b->tx_aborted_errors;
 711         a->tx_carrier_errors = b->tx_carrier_errors;
 712         a->tx_fifo_errors = b->tx_fifo_errors;
 713         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 714         a->tx_window_errors = b->tx_window_errors;
 715
 716         a->rx_compressed = b->rx_compressed;
 717         a->tx_compressed = b->tx_compressed;
 718 }
 719
 720 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
 721 {
 722         memcpy(v, b, sizeof(*b));
 723 }
 724
 725 /* All VF info */
 726 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 727                                    u32 ext_filter_mask)
 728 {
 729         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 730             (ext_filter_mask & RTEXT_FILTER_VF)) {
 731                 int num_vfs = dev_num_vf(dev->dev.parent);
 732                 size_t size = nla_total_size(sizeof(struct nlattr));
 733                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 734                 size += num_vfs *
 735                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 736                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 737                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 738                          nla_total_size(sizeof(struct ifla_vf_spoofchk)));
 739                 return size;
 740         } else
 741                 return 0;
 742 }
 743
 744 static size_t rtnl_port_size(const struct net_device *dev)
 745 {
 746         size_t port_size = nla_total_size(4)            /* PORT_VF */
 747                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 748                 + nla_total_size(sizeof(struct ifla_port_vsi))
 749                                                         /* PORT_VSI_TYPE */
 750                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 751                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 752                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 753                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 754         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 755         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 756                 + port_size;
 757         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 758                 + port_size;
 759
 760         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 761                 return 0;
 762         if (dev_num_vf(dev->dev.parent))
 763                 return port_self_size + vf_ports_size +
 764                         vf_port_size * dev_num_vf(dev->dev.parent);
 765         else
 766                 return port_self_size;
 767 }
 768
 769 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 770                                      u32 ext_filter_mask)
 771 {
 772         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 773                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 774                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 775                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 776                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 777                + nla_total_size(sizeof(struct rtnl_link_stats))
 778                + nla_total_size(sizeof(struct rtnl_link_stats64))
 779                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 780                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 781                + nla_total_size(4) /* IFLA_TXQLEN */
 782                + nla_total_size(4) /* IFLA_WEIGHT */
 783                + nla_total_size(4) /* IFLA_MTU */
 784                + nla_total_size(4) /* IFLA_LINK */
 785                + nla_total_size(4) /* IFLA_MASTER */
 786                + nla_total_size(1) /* IFLA_OPERSTATE */
 787                + nla_total_size(1) /* IFLA_LINKMODE */
 788                + nla_total_size(ext_filter_mask
 789                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 790                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 791                + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 792                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 793                + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
 794 }
 795
 796 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 797 {
 798         struct nlattr *vf_ports;
 799         struct nlattr *vf_port;
 800         int vf;
 801         int err;
 802
 803         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 804         if (!vf_ports)
 805                 return -EMSGSIZE;
 806
 807         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 808                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 809                 if (!vf_port)
 810                         goto nla_put_failure;
 811                 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
 812                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 813                 if (err == -EMSGSIZE)
 814                         goto nla_put_failure;
 815                 if (err) {
 816                         nla_nest_cancel(skb, vf_port);
 817                         continue;
 818                 }
 819                 nla_nest_end(skb, vf_port);
 820         }
 821
 822         nla_nest_end(skb, vf_ports);
 823
 824         return 0;
 825
 826 nla_put_failure:
 827         nla_nest_cancel(skb, vf_ports);
 828         return -EMSGSIZE;
 829 }
 830
 831 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 832 {
 833         struct nlattr *port_self;
 834         int err;
 835
 836         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 837         if (!port_self)
 838                 return -EMSGSIZE;
 839
 840         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 841         if (err) {
 842                 nla_nest_cancel(skb, port_self);
 843                 return (err == -EMSGSIZE) ? err : 0;
 844         }
 845
 846         nla_nest_end(skb, port_self);
 847
 848         return 0;
 849 }
 850
 851 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
 852 {
 853         int err;
 854
 855         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
 856                 return 0;
 857
 858         err = rtnl_port_self_fill(skb, dev);
 859         if (err)
 860                 return err;
 861
 862         if (dev_num_vf(dev->dev.parent)) {
 863                 err = rtnl_vf_ports_fill(skb, dev);
 864                 if (err)
 865                         return err;
 866         }
 867
 868         return 0;
 869 }
 870
 871 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 872                             int type, u32 pid, u32 seq, u32 change,
 873                             unsigned int flags, u32 ext_filter_mask)
 874 {
 875         struct ifinfomsg *ifm;
 876         struct nlmsghdr *nlh;
 877         struct rtnl_link_stats64 temp;
 878         const struct rtnl_link_stats64 *stats;
 879         struct nlattr *attr, *af_spec;
 880         struct rtnl_af_ops *af_ops;
 881
 882         ASSERT_RTNL();
 883         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 884         if (nlh == NULL)
 885                 return -EMSGSIZE;
 886
 887         ifm = nlmsg_data(nlh);
 888         ifm->ifi_family = AF_UNSPEC;
 889         ifm->__ifi_pad = 0;
 890         ifm->ifi_type = dev->type;
 891         ifm->ifi_index = dev->ifindex;
 892         ifm->ifi_flags = dev_get_flags(dev);
 893         ifm->ifi_change = change;
 894
 895         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 896         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
 897         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 898                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
 899         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
 900         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
 901         NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
 902
 903         if (dev->ifindex != dev->iflink)
 904                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 905
 906         if (dev->master)
 907                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
 908
 909         if (dev->qdisc)
 910                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
 911
 912         if (dev->ifalias)
 913                 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
 914
 915         if (1) {
 916                 struct rtnl_link_ifmap map = {
 917                         .mem_start   = dev->mem_start,
 918                         .mem_end     = dev->mem_end,
 919                         .base_addr   = dev->base_addr,
 920                         .irq         = dev->irq,
 921                         .dma         = dev->dma,
 922                         .port        = dev->if_port,
 923                 };
 924                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 925         }
 926
 927         if (dev->addr_len) {
 928                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 929                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 930         }
 931
 932         attr = nla_reserve(skb, IFLA_STATS,
 933                         sizeof(struct rtnl_link_stats));
 934         if (attr == NULL)
 935                 goto nla_put_failure;
 936
 937         stats = dev_get_stats(dev, &temp);
 938         copy_rtnl_link_stats(nla_data(attr), stats);
 939
 940         attr = nla_reserve(skb, IFLA_STATS64,
 941                         sizeof(struct rtnl_link_stats64));
 942         if (attr == NULL)
 943                 goto nla_put_failure;
 944         copy_rtnl_link_stats64(nla_data(attr), stats);
 945
 946         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF))
 947                 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
 948
 949         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
 950             && (ext_filter_mask & RTEXT_FILTER_VF)) {
 951                 int i;
 952
 953                 struct nlattr *vfinfo, *vf;
 954                 int num_vfs = dev_num_vf(dev->dev.parent);
 955
 956                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
 957                 if (!vfinfo)
 958                         goto nla_put_failure;
 959                 for (i = 0; i < num_vfs; i++) {
 960                         struct ifla_vf_info ivi;
 961                         struct ifla_vf_mac vf_mac;
 962                         struct ifla_vf_vlan vf_vlan;
 963                         struct ifla_vf_tx_rate vf_tx_rate;
 964                         struct ifla_vf_spoofchk vf_spoofchk;
 965
 966                         /*
 967                          * Not all SR-IOV capable drivers support the
 968                          * spoofcheck query.  Preset to -1 so the user
 969                          * space tool can detect that the driver didn't
 970                          * report anything.
 971                          */
 972                         ivi.spoofchk = -1;
 973                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
 974                                 break;
 975                         vf_mac.vf =
 976                                 vf_vlan.vf =
 977                                 vf_tx_rate.vf =
 978                                 vf_spoofchk.vf = ivi.vf;
 979
 980                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
 981                         vf_vlan.vlan = ivi.vlan;
 982                         vf_vlan.qos = ivi.qos;
 983                         vf_tx_rate.rate = ivi.tx_rate;
 984                         vf_spoofchk.setting = ivi.spoofchk;
 985                         vf = nla_nest_start(skb, IFLA_VF_INFO);
 986                         if (!vf) {
 987                                 nla_nest_cancel(skb, vfinfo);
 988                                 goto nla_put_failure;
 989                         }
 990                         NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
 991                         NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
 992                         NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
 993                                 &vf_tx_rate);
 994                         NLA_PUT(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
 995                                 &vf_spoofchk);
 996                         nla_nest_end(skb, vf);
 997                 }
 998                 nla_nest_end(skb, vfinfo);
 999         }
1000
1001         if (rtnl_port_fill(skb, dev))
1002                 goto nla_put_failure;
1003
1004         if (dev->rtnl_link_ops) {
1005                 if (rtnl_link_fill(skb, dev) < 0)
1006                         goto nla_put_failure;
1007         }
1008
1009         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1010                 goto nla_put_failure;
1011
1012         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1013                 if (af_ops->fill_link_af) {
1014                         struct nlattr *af;
1015                         int err;
1016
1017                         if (!(af = nla_nest_start(skb, af_ops->family)))
1018                                 goto nla_put_failure;
1019
1020                         err = af_ops->fill_link_af(skb, dev);
1021
1022                         /*
1023                          * Caller may return ENODATA to indicate that there
1024                          * was no data to be dumped. This is not an error, it
1025                          * means we should trim the attribute header and
1026                          * continue.
1027                          */
1028                         if (err == -ENODATA)
1029                                 nla_nest_cancel(skb, af);
1030                         else if (err < 0)
1031                                 goto nla_put_failure;
1032
1033                         nla_nest_end(skb, af);
1034                 }
1035         }
1036
1037         nla_nest_end(skb, af_spec);
1038
1039         return nlmsg_end(skb, nlh);
1040
1041 nla_put_failure:
1042         nlmsg_cancel(skb, nlh);
1043         return -EMSGSIZE;
1044 }
1045
1046 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1047 {
1048         struct net *net = sock_net(skb->sk);
1049         int h, s_h;
1050         int idx = 0, s_idx;
1051         struct net_device *dev;
1052         struct hlist_head *head;
1053         struct hlist_node *node;
1054         struct nlattr *tb[IFLA_MAX+1];
1055         u32 ext_filter_mask = 0;
1056
1057         s_h = cb->args[0];
1058         s_idx = cb->args[1];
1059
1060         rcu_read_lock();
1061         cb->seq = net->dev_base_seq;
1062
1063         if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1064                         ifla_policy) >= 0) {
1065
1066                 if (tb[IFLA_EXT_MASK])
1067                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1068         }
1069
1070         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1071                 idx = 0;
1072                 head = &net->dev_index_head[h];
1073                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1074                         if (idx < s_idx)
1075                                 goto cont;
1076                         if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1077                                              NETLINK_CB(cb->skb).pid,
1078                                              cb->nlh->nlmsg_seq, 0,
1079                                              NLM_F_MULTI,
1080                                              ext_filter_mask) <= 0)
1081                                 goto out;
1082
1083                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1084 cont:
1085                         idx++;
1086                 }
1087         }
1088 out:
1089         rcu_read_unlock();
1090         cb->args[1] = idx;
1091         cb->args[0] = h;
1092
1093         return skb->len;
1094 }
1095
1096 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1097         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1098         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1099         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1100         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1101         [IFLA_MTU]              = { .type = NLA_U32 },
1102         [IFLA_LINK]             = { .type = NLA_U32 },
1103         [IFLA_MASTER]           = { .type = NLA_U32 },
1104         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1105         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1106         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1107         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1108         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1109         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1110         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1111         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1112         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1113         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1114         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1115         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1116         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1117 };
1118 EXPORT_SYMBOL(ifla_policy);
1119
1120 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1121         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1122         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1123 };
1124
1125 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1126         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1127 };
1128
1129 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1130         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1131                                     .len = sizeof(struct ifla_vf_mac) },
1132         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1133                                     .len = sizeof(struct ifla_vf_vlan) },
1134         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1135                                     .len = sizeof(struct ifla_vf_tx_rate) },
1136         [IFLA_VF_SPOOFCHK]      = { .type = NLA_BINARY,
1137                                     .len = sizeof(struct ifla_vf_spoofchk) },
1138 };
1139
1140 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1141         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1142         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1143                                     .len = PORT_PROFILE_MAX },
1144         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1145                                     .len = sizeof(struct ifla_port_vsi)},
1146         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1147                                       .len = PORT_UUID_MAX },
1148         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1149                                     .len = PORT_UUID_MAX },
1150         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1151         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1152 };
1153
1154 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1155 {
1156         struct net *net;
1157         /* Examine the link attributes and figure out which
1158          * network namespace we are talking about.
1159          */
1160         if (tb[IFLA_NET_NS_PID])
1161                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1162         else if (tb[IFLA_NET_NS_FD])
1163                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1164         else
1165                 net = get_net(src_net);
1166         return net;
1167 }
1168 EXPORT_SYMBOL(rtnl_link_get_net);
1169
1170 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1171 {
1172         if (dev) {
1173                 if (tb[IFLA_ADDRESS] &&
1174                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1175                         return -EINVAL;
1176
1177                 if (tb[IFLA_BROADCAST] &&
1178                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1179                         return -EINVAL;
1180         }
1181
1182         if (tb[IFLA_AF_SPEC]) {
1183                 struct nlattr *af;
1184                 int rem, err;
1185
1186                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1187                         const struct rtnl_af_ops *af_ops;
1188
1189                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1190                                 return -EAFNOSUPPORT;
1191
1192                         if (!af_ops->set_link_af)
1193                                 return -EOPNOTSUPP;
1194
1195                         if (af_ops->validate_link_af) {
1196                                 err = af_ops->validate_link_af(dev, af);
1197                                 if (err < 0)
1198                                         return err;
1199                         }
1200                 }
1201         }
1202
1203         return 0;
1204 }
1205
1206 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1207 {
1208         int rem, err = -EINVAL;
1209         struct nlattr *vf;
1210         const struct net_device_ops *ops = dev->netdev_ops;
1211
1212         nla_for_each_nested(vf, attr, rem) {
1213                 switch (nla_type(vf)) {
1214                 case IFLA_VF_MAC: {
1215                         struct ifla_vf_mac *ivm;
1216                         ivm = nla_data(vf);
1217                         err = -EOPNOTSUPP;
1218                         if (ops->ndo_set_vf_mac)
1219                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1220                                                           ivm->mac);
1221                         break;
1222                 }
1223                 case IFLA_VF_VLAN: {
1224                         struct ifla_vf_vlan *ivv;
1225                         ivv = nla_data(vf);
1226                         err = -EOPNOTSUPP;
1227                         if (ops->ndo_set_vf_vlan)
1228                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1229                                                            ivv->vlan,
1230                                                            ivv->qos);
1231                         break;
1232                 }
1233                 case IFLA_VF_TX_RATE: {
1234                         struct ifla_vf_tx_rate *ivt;
1235                         ivt = nla_data(vf);
1236                         err = -EOPNOTSUPP;
1237                         if (ops->ndo_set_vf_tx_rate)
1238                                 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1239                                                               ivt->rate);
1240                         break;
1241                 }
1242                 case IFLA_VF_SPOOFCHK: {
1243                         struct ifla_vf_spoofchk *ivs;
1244                         ivs = nla_data(vf);
1245                         err = -EOPNOTSUPP;
1246                         if (ops->ndo_set_vf_spoofchk)
1247                                 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1248                                                                ivs->setting);
1249                         break;
1250                 }
1251                 default:
1252                         err = -EINVAL;
1253                         break;
1254                 }
1255                 if (err)
1256                         break;
1257         }
1258         return err;
1259 }
1260
1261 static int do_set_master(struct net_device *dev, int ifindex)
1262 {
1263         struct net_device *master_dev;
1264         const struct net_device_ops *ops;
1265         int err;
1266
1267         if (dev->master) {
1268                 if (dev->master->ifindex == ifindex)
1269                         return 0;
1270                 ops = dev->master->netdev_ops;
1271                 if (ops->ndo_del_slave) {
1272                         err = ops->ndo_del_slave(dev->master, dev);
1273                         if (err)
1274                                 return err;
1275                 } else {
1276                         return -EOPNOTSUPP;
1277                 }
1278         }
1279
1280         if (ifindex) {
1281                 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1282                 if (!master_dev)
1283                         return -EINVAL;
1284                 ops = master_dev->netdev_ops;
1285                 if (ops->ndo_add_slave) {
1286                         err = ops->ndo_add_slave(master_dev, dev);
1287                         if (err)
1288                                 return err;
1289                 } else {
1290                         return -EOPNOTSUPP;
1291                 }
1292         }
1293         return 0;
1294 }
1295
1296 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1297                       struct nlattr **tb, char *ifname, int modified)
1298 {
1299         const struct net_device_ops *ops = dev->netdev_ops;
1300         int send_addr_notify = 0;
1301         int err;
1302
1303         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1304                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1305                 if (IS_ERR(net)) {
1306                         err = PTR_ERR(net);
1307                         goto errout;
1308                 }
1309                 err = dev_change_net_namespace(dev, net, ifname);
1310                 put_net(net);
1311                 if (err)
1312                         goto errout;
1313                 modified = 1;
1314         }
1315
1316         if (tb[IFLA_MAP]) {
1317                 struct rtnl_link_ifmap *u_map;
1318                 struct ifmap k_map;
1319
1320                 if (!ops->ndo_set_config) {
1321                         err = -EOPNOTSUPP;
1322                         goto errout;
1323                 }
1324
1325                 if (!netif_device_present(dev)) {
1326                         err = -ENODEV;
1327                         goto errout;
1328                 }
1329
1330                 u_map = nla_data(tb[IFLA_MAP]);
1331                 k_map.mem_start = (unsigned long) u_map->mem_start;
1332                 k_map.mem_end = (unsigned long) u_map->mem_end;
1333                 k_map.base_addr = (unsigned short) u_map->base_addr;
1334                 k_map.irq = (unsigned char) u_map->irq;
1335                 k_map.dma = (unsigned char) u_map->dma;
1336                 k_map.port = (unsigned char) u_map->port;
1337
1338                 err = ops->ndo_set_config(dev, &k_map);
1339                 if (err < 0)
1340                         goto errout;
1341
1342                 modified = 1;
1343         }
1344
1345         if (tb[IFLA_ADDRESS]) {
1346                 struct sockaddr *sa;
1347                 int len;
1348
1349                 if (!ops->ndo_set_mac_address) {
1350                         err = -EOPNOTSUPP;
1351                         goto errout;
1352                 }
1353
1354                 if (!netif_device_present(dev)) {
1355                         err = -ENODEV;
1356                         goto errout;
1357                 }
1358
1359                 len = sizeof(sa_family_t) + dev->addr_len;
1360                 sa = kmalloc(len, GFP_KERNEL);
1361                 if (!sa) {
1362                         err = -ENOMEM;
1363                         goto errout;
1364                 }
1365                 sa->sa_family = dev->type;
1366                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1367                        dev->addr_len);
1368                 err = ops->ndo_set_mac_address(dev, sa);
1369                 kfree(sa);
1370                 if (err)
1371                         goto errout;
1372                 send_addr_notify = 1;
1373                 modified = 1;
1374         }
1375
1376         if (tb[IFLA_MTU]) {
1377                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1378                 if (err < 0)
1379                         goto errout;
1380                 modified = 1;
1381         }
1382
1383         if (tb[IFLA_GROUP]) {
1384                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1385                 modified = 1;
1386         }
1387
1388         /*
1389          * Interface selected by interface index but interface
1390          * name provided implies that a name change has been
1391          * requested.
1392          */
1393         if (ifm->ifi_index > 0 && ifname[0]) {
1394                 err = dev_change_name(dev, ifname);
1395                 if (err < 0)
1396                         goto errout;
1397                 modified = 1;
1398         }
1399
1400         if (tb[IFLA_IFALIAS]) {
1401                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1402                                     nla_len(tb[IFLA_IFALIAS]));
1403                 if (err < 0)
1404                         goto errout;
1405                 modified = 1;
1406         }
1407
1408         if (tb[IFLA_BROADCAST]) {
1409                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1410                 send_addr_notify = 1;
1411         }
1412
1413         if (ifm->ifi_flags || ifm->ifi_change) {
1414                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1415                 if (err < 0)
1416                         goto errout;
1417         }
1418
1419         if (tb[IFLA_MASTER]) {
1420                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1421                 if (err)
1422                         goto errout;
1423                 modified = 1;
1424         }
1425
1426         if (tb[IFLA_TXQLEN])
1427                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1428
1429         if (tb[IFLA_OPERSTATE])
1430                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1431
1432         if (tb[IFLA_LINKMODE]) {
1433                 write_lock_bh(&dev_base_lock);
1434                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1435                 write_unlock_bh(&dev_base_lock);
1436         }
1437
1438         if (tb[IFLA_VFINFO_LIST]) {
1439                 struct nlattr *attr;
1440                 int rem;
1441                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1442                         if (nla_type(attr) != IFLA_VF_INFO) {
1443                                 err = -EINVAL;
1444                                 goto errout;
1445                         }
1446                         err = do_setvfinfo(dev, attr);
1447                         if (err < 0)
1448                                 goto errout;
1449                         modified = 1;
1450                 }
1451         }
1452         err = 0;
1453
1454         if (tb[IFLA_VF_PORTS]) {
1455                 struct nlattr *port[IFLA_PORT_MAX+1];
1456                 struct nlattr *attr;
1457                 int vf;
1458                 int rem;
1459
1460                 err = -EOPNOTSUPP;
1461                 if (!ops->ndo_set_vf_port)
1462                         goto errout;
1463
1464                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1465                         if (nla_type(attr) != IFLA_VF_PORT)
1466                                 continue;
1467                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1468                                 attr, ifla_port_policy);
1469                         if (err < 0)
1470                                 goto errout;
1471                         if (!port[IFLA_PORT_VF]) {
1472                                 err = -EOPNOTSUPP;
1473                                 goto errout;
1474                         }
1475                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1476                         err = ops->ndo_set_vf_port(dev, vf, port);
1477                         if (err < 0)
1478                                 goto errout;
1479                         modified = 1;
1480                 }
1481         }
1482         err = 0;
1483
1484         if (tb[IFLA_PORT_SELF]) {
1485                 struct nlattr *port[IFLA_PORT_MAX+1];
1486
1487                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1488                         tb[IFLA_PORT_SELF], ifla_port_policy);
1489                 if (err < 0)
1490                         goto errout;
1491
1492                 err = -EOPNOTSUPP;
1493                 if (ops->ndo_set_vf_port)
1494                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1495                 if (err < 0)
1496                         goto errout;
1497                 modified = 1;
1498         }
1499
1500         if (tb[IFLA_AF_SPEC]) {
1501                 struct nlattr *af;
1502                 int rem;
1503
1504                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1505                         const struct rtnl_af_ops *af_ops;
1506
1507                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1508                                 BUG();
1509
1510                         err = af_ops->set_link_af(dev, af);
1511                         if (err < 0)
1512                                 goto errout;
1513
1514                         modified = 1;
1515                 }
1516         }
1517         err = 0;
1518
1519 errout:
1520         if (err < 0 && modified && net_ratelimit())
1521                 printk(KERN_WARNING "A link change request failed with "
1522                        "some changes committed already. Interface %s may "
1523                        "have been left with an inconsistent configuration, "
1524                        "please check.\n", dev->name);
1525
1526         if (send_addr_notify)
1527                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1528
1529         return err;
1530 }
1531
1532 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1533 {
1534         struct net *net = sock_net(skb->sk);
1535         struct ifinfomsg *ifm;
1536         struct net_device *dev;
1537         int err;
1538         struct nlattr *tb[IFLA_MAX+1];
1539         char ifname[IFNAMSIZ];
1540
1541         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1542         if (err < 0)
1543                 goto errout;
1544
1545         if (tb[IFLA_IFNAME])
1546                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1547         else
1548                 ifname[0] = '\0';
1549
1550         err = -EINVAL;
1551         ifm = nlmsg_data(nlh);
1552         if (ifm->ifi_index > 0)
1553                 dev = __dev_get_by_index(net, ifm->ifi_index);
1554         else if (tb[IFLA_IFNAME])
1555                 dev = __dev_get_by_name(net, ifname);
1556         else
1557                 goto errout;
1558
1559         if (dev == NULL) {
1560                 err = -ENODEV;
1561                 goto errout;
1562         }
1563
1564         err = validate_linkmsg(dev, tb);
1565         if (err < 0)
1566                 goto errout;
1567
1568         err = do_setlink(dev, ifm, tb, ifname, 0);
1569 errout:
1570         return err;
1571 }
1572
1573 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1574 {
1575         struct net *net = sock_net(skb->sk);
1576         const struct rtnl_link_ops *ops;
1577         struct net_device *dev;
1578         struct ifinfomsg *ifm;
1579         char ifname[IFNAMSIZ];
1580         struct nlattr *tb[IFLA_MAX+1];
1581         int err;
1582         LIST_HEAD(list_kill);
1583
1584         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1585         if (err < 0)
1586                 return err;
1587
1588         if (tb[IFLA_IFNAME])
1589                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1590
1591         ifm = nlmsg_data(nlh);
1592         if (ifm->ifi_index > 0)
1593                 dev = __dev_get_by_index(net, ifm->ifi_index);
1594         else if (tb[IFLA_IFNAME])
1595                 dev = __dev_get_by_name(net, ifname);
1596         else
1597                 return -EINVAL;
1598
1599         if (!dev)
1600                 return -ENODEV;
1601
1602         ops = dev->rtnl_link_ops;
1603         if (!ops)
1604                 return -EOPNOTSUPP;
1605
1606         ops->dellink(dev, &list_kill);
1607         unregister_netdevice_many(&list_kill);
1608         list_del(&list_kill);
1609         return 0;
1610 }
1611
1612 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1613 {
1614         unsigned int old_flags;
1615         int err;
1616
1617         old_flags = dev->flags;
1618         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1619                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1620                 if (err < 0)
1621                         return err;
1622         }
1623
1624         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1625         rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1626
1627         __dev_notify_flags(dev, old_flags);
1628         return 0;
1629 }
1630 EXPORT_SYMBOL(rtnl_configure_link);
1631
1632 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1633         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1634 {
1635         int err;
1636         struct net_device *dev;
1637         unsigned int num_queues = 1;
1638         unsigned int real_num_queues = 1;
1639
1640         if (ops->get_tx_queues) {
1641                 err = ops->get_tx_queues(src_net, tb, &num_queues,
1642                                          &real_num_queues);
1643                 if (err)
1644                         goto err;
1645         }
1646         err = -ENOMEM;
1647         dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1648         if (!dev)
1649                 goto err;
1650
1651         dev_net_set(dev, net);
1652         dev->rtnl_link_ops = ops;
1653         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1654
1655         if (tb[IFLA_MTU])
1656                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1657         if (tb[IFLA_ADDRESS])
1658                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1659                                 nla_len(tb[IFLA_ADDRESS]));
1660         if (tb[IFLA_BROADCAST])
1661                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1662                                 nla_len(tb[IFLA_BROADCAST]));
1663         if (tb[IFLA_TXQLEN])
1664                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1665         if (tb[IFLA_OPERSTATE])
1666                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1667         if (tb[IFLA_LINKMODE])
1668                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1669         if (tb[IFLA_GROUP])
1670                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1671
1672         return dev;
1673
1674 err:
1675         return ERR_PTR(err);
1676 }
1677 EXPORT_SYMBOL(rtnl_create_link);
1678
1679 static int rtnl_group_changelink(struct net *net, int group,
1680                 struct ifinfomsg *ifm,
1681                 struct nlattr **tb)
1682 {
1683         struct net_device *dev;
1684         int err;
1685
1686         for_each_netdev(net, dev) {
1687                 if (dev->group == group) {
1688                         err = do_setlink(dev, ifm, tb, NULL, 0);
1689                         if (err < 0)
1690                                 return err;
1691                 }
1692         }
1693
1694         return 0;
1695 }
1696
1697 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1698 {
1699         struct net *net = sock_net(skb->sk);
1700         const struct rtnl_link_ops *ops;
1701         struct net_device *dev;
1702         struct ifinfomsg *ifm;
1703         char kind[MODULE_NAME_LEN];
1704         char ifname[IFNAMSIZ];
1705         struct nlattr *tb[IFLA_MAX+1];
1706         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1707         int err;
1708
1709 #ifdef CONFIG_MODULES
1710 replay:
1711 #endif
1712         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1713         if (err < 0)
1714                 return err;
1715
1716         if (tb[IFLA_IFNAME])
1717                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1718         else
1719                 ifname[0] = '\0';
1720
1721         ifm = nlmsg_data(nlh);
1722         if (ifm->ifi_index > 0)
1723                 dev = __dev_get_by_index(net, ifm->ifi_index);
1724         else {
1725                 if (ifname[0])
1726                         dev = __dev_get_by_name(net, ifname);
1727                 else
1728                         dev = NULL;
1729         }
1730
1731         err = validate_linkmsg(dev, tb);
1732         if (err < 0)
1733                 return err;
1734
1735         if (tb[IFLA_LINKINFO]) {
1736                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1737                                        tb[IFLA_LINKINFO], ifla_info_policy);
1738                 if (err < 0)
1739                         return err;
1740         } else
1741                 memset(linkinfo, 0, sizeof(linkinfo));
1742
1743         if (linkinfo[IFLA_INFO_KIND]) {
1744                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1745                 ops = rtnl_link_ops_get(kind);
1746         } else {
1747                 kind[0] = '\0';
1748                 ops = NULL;
1749         }
1750
1751         if (1) {
1752                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1753                 struct net *dest_net;
1754
1755                 if (ops) {
1756                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1757                                 err = nla_parse_nested(attr, ops->maxtype,
1758                                                        linkinfo[IFLA_INFO_DATA],
1759                                                        ops->policy);
1760                                 if (err < 0)
1761                                         return err;
1762                                 data = attr;
1763                         }
1764                         if (ops->validate) {
1765                                 err = ops->validate(tb, data);
1766                                 if (err < 0)
1767                                         return err;
1768                         }
1769                 }
1770
1771                 if (dev) {
1772                         int modified = 0;
1773
1774                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1775                                 return -EEXIST;
1776                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1777                                 return -EOPNOTSUPP;
1778
1779                         if (linkinfo[IFLA_INFO_DATA]) {
1780                                 if (!ops || ops != dev->rtnl_link_ops ||
1781                                     !ops->changelink)
1782                                         return -EOPNOTSUPP;
1783
1784                                 err = ops->changelink(dev, tb, data);
1785                                 if (err < 0)
1786                                         return err;
1787                                 modified = 1;
1788                         }
1789
1790                         return do_setlink(dev, ifm, tb, ifname, modified);
1791                 }
1792
1793                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1794                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1795                                 return rtnl_group_changelink(net,
1796                                                 nla_get_u32(tb[IFLA_GROUP]),
1797                                                 ifm, tb);
1798                         return -ENODEV;
1799                 }
1800
1801                 if (ifm->ifi_index)
1802                         return -EOPNOTSUPP;
1803                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1804                         return -EOPNOTSUPP;
1805
1806                 if (!ops) {
1807 #ifdef CONFIG_MODULES
1808                         if (kind[0]) {
1809                                 __rtnl_unlock();
1810                                 request_module("rtnl-link-%s", kind);
1811                                 rtnl_lock();
1812                                 ops = rtnl_link_ops_get(kind);
1813                                 if (ops)
1814                                         goto replay;
1815                         }
1816 #endif
1817                         return -EOPNOTSUPP;
1818                 }
1819
1820                 if (!ifname[0])
1821                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1822
1823                 dest_net = rtnl_link_get_net(net, tb);
1824                 if (IS_ERR(dest_net))
1825                         return PTR_ERR(dest_net);
1826
1827                 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1828
1829                 if (IS_ERR(dev))
1830                         err = PTR_ERR(dev);
1831                 else if (ops->newlink)
1832                         err = ops->newlink(net, dev, tb, data);
1833                 else
1834                         err = register_netdevice(dev);
1835
1836                 if (err < 0 && !IS_ERR(dev))
1837                         free_netdev(dev);
1838                 if (err < 0)
1839                         goto out;
1840
1841                 err = rtnl_configure_link(dev, ifm);
1842                 if (err < 0)
1843                         unregister_netdevice(dev);
1844 out:
1845                 put_net(dest_net);
1846                 return err;
1847         }
1848 }
1849
1850 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1851 {
1852         struct net *net = sock_net(skb->sk);
1853         struct ifinfomsg *ifm;
1854         char ifname[IFNAMSIZ];
1855         struct nlattr *tb[IFLA_MAX+1];
1856         struct net_device *dev = NULL;
1857         struct sk_buff *nskb;
1858         int err;
1859         u32 ext_filter_mask = 0;
1860
1861         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1862         if (err < 0)
1863                 return err;
1864
1865         if (tb[IFLA_IFNAME])
1866                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1867
1868         if (tb[IFLA_EXT_MASK])
1869                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1870
1871         ifm = nlmsg_data(nlh);
1872         if (ifm->ifi_index > 0)
1873                 dev = __dev_get_by_index(net, ifm->ifi_index);
1874         else if (tb[IFLA_IFNAME])
1875                 dev = __dev_get_by_name(net, ifname);
1876         else
1877                 return -EINVAL;
1878
1879         if (dev == NULL)
1880                 return -ENODEV;
1881
1882         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1883         if (nskb == NULL)
1884                 return -ENOBUFS;
1885
1886         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1887                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1888         if (err < 0) {
1889                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1890                 WARN_ON(err == -EMSGSIZE);
1891                 kfree_skb(nskb);
1892         } else
1893                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1894
1895         return err;
1896 }
1897
1898 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1899 {
1900         struct net *net = sock_net(skb->sk);
1901         struct net_device *dev;
1902         struct nlattr *tb[IFLA_MAX+1];
1903         u32 ext_filter_mask = 0;
1904         u16 min_ifinfo_dump_size = 0;
1905
1906         if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1907                         ifla_policy) >= 0) {
1908                 if (tb[IFLA_EXT_MASK])
1909                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1910         }
1911
1912         if (!ext_filter_mask)
1913                 return NLMSG_GOODSIZE;
1914         /*
1915          * traverse the list of net devices and compute the minimum
1916          * buffer size based upon the filter mask.
1917          */
1918         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1919                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1920                                              if_nlmsg_size(dev,
1921                                                            ext_filter_mask));
1922         }
1923
1924         return min_ifinfo_dump_size;
1925 }
1926
1927 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1928 {
1929         int idx;
1930         int s_idx = cb->family;
1931
1932         if (s_idx == 0)
1933                 s_idx = 1;
1934         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1935                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1936                 if (idx < s_idx || idx == PF_PACKET)
1937                         continue;
1938                 if (rtnl_msg_handlers[idx] == NULL ||
1939                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1940                         continue;
1941                 if (idx > s_idx)
1942                         memset(&cb->args[0], 0, sizeof(cb->args));
1943                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1944                         break;
1945         }
1946         cb->family = idx;
1947
1948         return skb->len;
1949 }
1950
1951 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1952 {
1953         struct net *net = dev_net(dev);
1954         struct sk_buff *skb;
1955         int err = -ENOBUFS;
1956         size_t if_info_size;
1957
1958         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1959         if (skb == NULL)
1960                 goto errout;
1961
1962         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1963         if (err < 0) {
1964                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1965                 WARN_ON(err == -EMSGSIZE);
1966                 kfree_skb(skb);
1967                 goto errout;
1968         }
1969         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1970         return;
1971 errout:
1972         if (err < 0)
1973                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1974 }
1975
1976 /* Protected by RTNL sempahore.  */
1977 static struct rtattr **rta_buf;
1978 static int rtattr_max;
1979
1980 /* Process one rtnetlink message. */
1981
1982 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1983 {
1984         struct net *net = sock_net(skb->sk);
1985         rtnl_doit_func doit;
1986         int sz_idx, kind;
1987         int min_len;
1988         int family;
1989         int type;
1990         int err;
1991
1992         type = nlh->nlmsg_type;
1993         if (type > RTM_MAX)
1994                 return -EOPNOTSUPP;
1995
1996         type -= RTM_BASE;
1997
1998         /* All the messages must have at least 1 byte length */
1999         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
2000                 return 0;
2001
2002         family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
2003         sz_idx = type>>2;
2004         kind = type&3;
2005
2006         if (kind != 2 && !capable(CAP_NET_ADMIN))
2007                 return -EPERM;
2008
2009         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2010                 struct sock *rtnl;
2011                 rtnl_dumpit_func dumpit;
2012                 rtnl_calcit_func calcit;
2013                 u16 min_dump_alloc = 0;
2014
2015                 dumpit = rtnl_get_dumpit(family, type);
2016                 if (dumpit == NULL)
2017                         return -EOPNOTSUPP;
2018                 calcit = rtnl_get_calcit(family, type);
2019                 if (calcit)
2020                         min_dump_alloc = calcit(skb, nlh);
2021
2022                 __rtnl_unlock();
2023                 rtnl = net->rtnl;
2024                 {
2025                         struct netlink_dump_control c = {
2026                                 .dump           = dumpit,
2027                                 .min_dump_alloc = min_dump_alloc,
2028                         };
2029                         err = netlink_dump_start(rtnl, skb, nlh, &c);
2030                 }
2031                 rtnl_lock();
2032                 return err;
2033         }
2034
2035         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
2036
2037         min_len = rtm_min[sz_idx];
2038         if (nlh->nlmsg_len < min_len)
2039                 return -EINVAL;
2040
2041         if (nlh->nlmsg_len > min_len) {
2042                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
2043                 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
2044
2045                 while (RTA_OK(attr, attrlen)) {
2046                         unsigned flavor = attr->rta_type;
2047                         if (flavor) {
2048                                 if (flavor > rta_max[sz_idx])
2049                                         return -EINVAL;
2050                                 rta_buf[flavor-1] = attr;
2051                         }
2052                         attr = RTA_NEXT(attr, attrlen);
2053                 }
2054         }
2055
2056         doit = rtnl_get_doit(family, type);
2057         if (doit == NULL)
2058                 return -EOPNOTSUPP;
2059
2060         return doit(skb, nlh, (void *)&rta_buf[0]);
2061 }
2062
2063 static void rtnetlink_rcv(struct sk_buff *skb)
2064 {
2065         rtnl_lock();
2066         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2067         rtnl_unlock();
2068 }
2069
2070 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2071 {
2072         struct net_device *dev = ptr;
2073
2074         switch (event) {
2075         case NETDEV_UP:
2076         case NETDEV_DOWN:
2077         case NETDEV_PRE_UP:
2078         case NETDEV_POST_INIT:
2079         case NETDEV_REGISTER:
2080         case NETDEV_CHANGE:
2081         case NETDEV_PRE_TYPE_CHANGE:
2082         case NETDEV_GOING_DOWN:
2083         case NETDEV_UNREGISTER:
2084         case NETDEV_UNREGISTER_BATCH:
2085         case NETDEV_RELEASE:
2086         case NETDEV_JOIN:
2087                 break;
2088         default:
2089                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2090                 break;
2091         }
2092         return NOTIFY_DONE;
2093 }
2094
2095 static struct notifier_block rtnetlink_dev_notifier = {
2096         .notifier_call  = rtnetlink_event,
2097 };
2098
2099
2100 static int __net_init rtnetlink_net_init(struct net *net)
2101 {
2102         struct sock *sk;
2103         sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2104                                    rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2105         if (!sk)
2106                 return -ENOMEM;
2107         net->rtnl = sk;
2108         return 0;
2109 }
2110
2111 static void __net_exit rtnetlink_net_exit(struct net *net)
2112 {
2113         netlink_kernel_release(net->rtnl);
2114         net->rtnl = NULL;
2115 }
2116
2117 static struct pernet_operations rtnetlink_net_ops = {
2118         .init = rtnetlink_net_init,
2119         .exit = rtnetlink_net_exit,
2120 };
2121
2122 void __init rtnetlink_init(void)
2123 {
2124         int i;
2125
2126         rtattr_max = 0;
2127         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2128                 if (rta_max[i] > rtattr_max)
2129                         rtattr_max = rta_max[i];
2130         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2131         if (!rta_buf)
2132                 panic("rtnetlink_init: cannot allocate rta_buf\n");
2133
2134         if (register_pernet_subsys(&rtnetlink_net_ops))
2135                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2136
2137         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2138         register_netdevice_notifier(&rtnetlink_dev_notifier);
2139
2140         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2141                       rtnl_dump_ifinfo, rtnl_calcit);
2142         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2143         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2144         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2145
2146         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2147         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2148 }
2149