git.oblomov.eu Git - linux-2.6/blob - net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/sock.h>
  66 #include <net/snmp.h>
  67
  68 #include <net/ipv6.h>
  69 #include <net/protocol.h>
  70 #include <net/ndisc.h>
  71 #include <net/ip6_route.h>
  72 #include <net/addrconf.h>
  73 #include <net/tcp.h>
  74 #include <net/ip.h>
  75 #include <net/netlink.h>
  76 #include <linux/if_tunnel.h>
  77 #include <linux/rtnetlink.h>
  78
  79 #ifdef CONFIG_IPV6_PRIVACY
  80 #include <linux/random.h>
  81 #endif
  82
  83 #include <asm/uaccess.h>
  84
  85 #include <linux/proc_fs.h>
  86 #include <linux/seq_file.h>
  87
  88 /* Set to 3 to get tracing... */
  89 #define ACONF_DEBUG 2
  90
  91 #if ACONF_DEBUG >= 3
  92 #define ADBG(x) printk x
  93 #else
  94 #define ADBG(x)
  95 #endif
  96
  97 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  99
 100 #ifdef CONFIG_SYSCTL
 101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 103 #endif
 104
 105 #ifdef CONFIG_IPV6_PRIVACY
 106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 108 static void ipv6_regen_rndid(unsigned long data);
 109
 110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 111 #endif
 112
 113 static int ipv6_count_addresses(struct inet6_dev *idev);
 114
 115 /*
 116  *      Configured unicast address hash table
 117  */
 118 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 119 static DEFINE_RWLOCK(addrconf_hash_lock);
 120
 121 static void addrconf_verify(unsigned long);
 122
 123 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 124 static DEFINE_SPINLOCK(addrconf_verify_lock);
 125
 126 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 128
 129 static int addrconf_ifdown(struct net_device *dev, int how);
 130
 131 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 132 static void addrconf_dad_timer(unsigned long data);
 133 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 134 static void addrconf_dad_run(struct inet6_dev *idev);
 135 static void addrconf_rs_timer(unsigned long data);
 136 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 137 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 138
 139 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 140                                 struct prefix_info *pinfo);
 141 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 142
 143 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 144
 145 struct ipv6_devconf ipv6_devconf __read_mostly = {
 146         .forwarding             = 0,
 147         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 148         .mtu6                   = IPV6_MIN_MTU,
 149         .accept_ra              = 1,
 150         .accept_redirects       = 1,
 151         .autoconf               = 1,
 152         .force_mld_version      = 0,
 153         .dad_transmits          = 1,
 154         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 155         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 156         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 157 #ifdef CONFIG_IPV6_PRIVACY
 158         .use_tempaddr           = 0,
 159         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 160         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 161         .regen_max_retry        = REGEN_MAX_RETRY,
 162         .max_desync_factor      = MAX_DESYNC_FACTOR,
 163 #endif
 164         .max_addresses          = IPV6_MAX_ADDRESSES,
 165         .accept_ra_defrtr       = 1,
 166         .accept_ra_pinfo        = 1,
 167 #ifdef CONFIG_IPV6_ROUTER_PREF
 168         .accept_ra_rtr_pref     = 1,
 169         .rtr_probe_interval     = 60 * HZ,
 170 #ifdef CONFIG_IPV6_ROUTE_INFO
 171         .accept_ra_rt_info_max_plen = 0,
 172 #endif
 173 #endif
 174         .proxy_ndp              = 0,
 175         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 176 };
 177
 178 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 179         .forwarding             = 0,
 180         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 181         .mtu6                   = IPV6_MIN_MTU,
 182         .accept_ra              = 1,
 183         .accept_redirects       = 1,
 184         .autoconf               = 1,
 185         .dad_transmits          = 1,
 186         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 187         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 188         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 189 #ifdef CONFIG_IPV6_PRIVACY
 190         .use_tempaddr           = 0,
 191         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 192         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 193         .regen_max_retry        = REGEN_MAX_RETRY,
 194         .max_desync_factor      = MAX_DESYNC_FACTOR,
 195 #endif
 196         .max_addresses          = IPV6_MAX_ADDRESSES,
 197         .accept_ra_defrtr       = 1,
 198         .accept_ra_pinfo        = 1,
 199 #ifdef CONFIG_IPV6_ROUTER_PREF
 200         .accept_ra_rtr_pref     = 1,
 201         .rtr_probe_interval     = 60 * HZ,
 202 #ifdef CONFIG_IPV6_ROUTE_INFO
 203         .accept_ra_rt_info_max_plen = 0,
 204 #endif
 205 #endif
 206         .proxy_ndp              = 0,
 207         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 208 };
 209
 210 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 211 #if 0
 212 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 213 #endif
 214 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 215
 216 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 217 {
 218         if (del_timer(&ifp->timer))
 219                 __in6_ifa_put(ifp);
 220 }
 221
 222 enum addrconf_timer_t
 223 {
 224         AC_NONE,
 225         AC_DAD,
 226         AC_RS,
 227 };
 228
 229 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 230                                enum addrconf_timer_t what,
 231                                unsigned long when)
 232 {
 233         if (!del_timer(&ifp->timer))
 234                 in6_ifa_hold(ifp);
 235
 236         switch (what) {
 237         case AC_DAD:
 238                 ifp->timer.function = addrconf_dad_timer;
 239                 break;
 240         case AC_RS:
 241                 ifp->timer.function = addrconf_rs_timer;
 242                 break;
 243         default:;
 244         }
 245         ifp->timer.expires = jiffies + when;
 246         add_timer(&ifp->timer);
 247 }
 248
 249 /* Nobody refers to this device, we may destroy it. */
 250
 251 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 252 {
 253         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 254         kfree(idev);
 255 }
 256
 257 void in6_dev_finish_destroy(struct inet6_dev *idev)
 258 {
 259         struct net_device *dev = idev->dev;
 260         BUG_TRAP(idev->addr_list==NULL);
 261         BUG_TRAP(idev->mc_list==NULL);
 262 #ifdef NET_REFCNT_DEBUG
 263         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 264 #endif
 265         dev_put(dev);
 266         if (!idev->dead) {
 267                 printk("Freeing alive inet6 device %p\n", idev);
 268                 return;
 269         }
 270         snmp6_free_dev(idev);
 271         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 272 }
 273
 274 EXPORT_SYMBOL(in6_dev_finish_destroy);
 275
 276 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 277 {
 278         struct inet6_dev *ndev;
 279         struct in6_addr maddr;
 280
 281         ASSERT_RTNL();
 282
 283         if (dev->mtu < IPV6_MIN_MTU)
 284                 return NULL;
 285
 286         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 287
 288         if (ndev == NULL)
 289                 return NULL;
 290
 291         rwlock_init(&ndev->lock);
 292         ndev->dev = dev;
 293         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 294         ndev->cnf.mtu6 = dev->mtu;
 295         ndev->cnf.sysctl = NULL;
 296         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 297         if (ndev->nd_parms == NULL) {
 298                 kfree(ndev);
 299                 return NULL;
 300         }
 301         /* We refer to the device */
 302         dev_hold(dev);
 303
 304         if (snmp6_alloc_dev(ndev) < 0) {
 305                 ADBG((KERN_WARNING
 306                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 307                         __FUNCTION__, dev->name));
 308                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 309                 ndev->dead = 1;
 310                 in6_dev_finish_destroy(ndev);
 311                 return NULL;
 312         }
 313
 314         if (snmp6_register_dev(ndev) < 0) {
 315                 ADBG((KERN_WARNING
 316                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 317                         __FUNCTION__, dev->name));
 318                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 319                 ndev->dead = 1;
 320                 in6_dev_finish_destroy(ndev);
 321                 return NULL;
 322         }
 323
 324         /* One reference from device.  We must do this before
 325          * we invoke __ipv6_regen_rndid().
 326          */
 327         in6_dev_hold(ndev);
 328
 329 #ifdef CONFIG_IPV6_PRIVACY
 330         init_timer(&ndev->regen_timer);
 331         ndev->regen_timer.function = ipv6_regen_rndid;
 332         ndev->regen_timer.data = (unsigned long) ndev;
 333         if ((dev->flags&IFF_LOOPBACK) ||
 334             dev->type == ARPHRD_TUNNEL ||
 335 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 336             dev->type == ARPHRD_SIT ||
 337 #endif
 338             dev->type == ARPHRD_NONE) {
 339                 printk(KERN_INFO
 340                        "%s: Disabled Privacy Extensions\n",
 341                        dev->name);
 342                 ndev->cnf.use_tempaddr = -1;
 343         } else {
 344                 in6_dev_hold(ndev);
 345                 ipv6_regen_rndid((unsigned long) ndev);
 346         }
 347 #endif
 348
 349         if (netif_running(dev) && netif_carrier_ok(dev))
 350                 ndev->if_flags |= IF_READY;
 351
 352         ipv6_mc_init_dev(ndev);
 353         ndev->tstamp = jiffies;
 354 #ifdef CONFIG_SYSCTL
 355         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 356                               NET_IPV6_NEIGH, "ipv6",
 357                               &ndisc_ifinfo_sysctl_change,
 358                               NULL);
 359         addrconf_sysctl_register(ndev, &ndev->cnf);
 360 #endif
 361         /* protected by rtnl_lock */
 362         rcu_assign_pointer(dev->ip6_ptr, ndev);
 363
 364         /* Join all-node multicast group */
 365         ipv6_addr_all_nodes(&maddr);
 366         ipv6_dev_mc_inc(dev, &maddr);
 367
 368         return ndev;
 369 }
 370
 371 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 372 {
 373         struct inet6_dev *idev;
 374
 375         ASSERT_RTNL();
 376
 377         if ((idev = __in6_dev_get(dev)) == NULL) {
 378                 if ((idev = ipv6_add_dev(dev)) == NULL)
 379                         return NULL;
 380         }
 381
 382         if (dev->flags&IFF_UP)
 383                 ipv6_mc_up(idev);
 384         return idev;
 385 }
 386
 387 #ifdef CONFIG_SYSCTL
 388 static void dev_forward_change(struct inet6_dev *idev)
 389 {
 390         struct net_device *dev;
 391         struct inet6_ifaddr *ifa;
 392         struct in6_addr addr;
 393
 394         if (!idev)
 395                 return;
 396         dev = idev->dev;
 397         if (dev && (dev->flags & IFF_MULTICAST)) {
 398                 ipv6_addr_all_routers(&addr);
 399
 400                 if (idev->cnf.forwarding)
 401                         ipv6_dev_mc_inc(dev, &addr);
 402                 else
 403                         ipv6_dev_mc_dec(dev, &addr);
 404         }
 405         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 406                 if (ifa->flags&IFA_F_TENTATIVE)
 407                         continue;
 408                 if (idev->cnf.forwarding)
 409                         addrconf_join_anycast(ifa);
 410                 else
 411                         addrconf_leave_anycast(ifa);
 412         }
 413 }
 414
 415
 416 static void addrconf_forward_change(void)
 417 {
 418         struct net_device *dev;
 419         struct inet6_dev *idev;
 420
 421         read_lock(&dev_base_lock);
 422         for (dev=dev_base; dev; dev=dev->next) {
 423                 rcu_read_lock();
 424                 idev = __in6_dev_get(dev);
 425                 if (idev) {
 426                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 427                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 428                         if (changed)
 429                                 dev_forward_change(idev);
 430                 }
 431                 rcu_read_unlock();
 432         }
 433         read_unlock(&dev_base_lock);
 434 }
 435 #endif
 436
 437 /* Nobody refers to this ifaddr, destroy it */
 438
 439 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 440 {
 441         BUG_TRAP(ifp->if_next==NULL);
 442         BUG_TRAP(ifp->lst_next==NULL);
 443 #ifdef NET_REFCNT_DEBUG
 444         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 445 #endif
 446
 447         in6_dev_put(ifp->idev);
 448
 449         if (del_timer(&ifp->timer))
 450                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 451
 452         if (!ifp->dead) {
 453                 printk("Freeing alive inet6 address %p\n", ifp);
 454                 return;
 455         }
 456         dst_release(&ifp->rt->u.dst);
 457
 458         kfree(ifp);
 459 }
 460
 461 static void
 462 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 463 {
 464         struct inet6_ifaddr *ifa, **ifap;
 465         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 466
 467         /*
 468          * Each device address list is sorted in order of scope -
 469          * global before linklocal.
 470          */
 471         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 472              ifap = &ifa->if_next) {
 473                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 474                         break;
 475         }
 476
 477         ifp->if_next = *ifap;
 478         *ifap = ifp;
 479 }
 480
 481 /* On success it returns ifp with increased reference count */
 482
 483 static struct inet6_ifaddr *
 484 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 485               int scope, u32 flags)
 486 {
 487         struct inet6_ifaddr *ifa = NULL;
 488         struct rt6_info *rt;
 489         int hash;
 490         int err = 0;
 491
 492         rcu_read_lock_bh();
 493         if (idev->dead) {
 494                 err = -ENODEV;                  /*XXX*/
 495                 goto out2;
 496         }
 497
 498         write_lock(&addrconf_hash_lock);
 499
 500         /* Ignore adding duplicate addresses on an interface */
 501         if (ipv6_chk_same_addr(addr, idev->dev)) {
 502                 ADBG(("ipv6_add_addr: already assigned\n"));
 503                 err = -EEXIST;
 504                 goto out;
 505         }
 506
 507         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 508
 509         if (ifa == NULL) {
 510                 ADBG(("ipv6_add_addr: malloc failed\n"));
 511                 err = -ENOBUFS;
 512                 goto out;
 513         }
 514
 515         rt = addrconf_dst_alloc(idev, addr, 0);
 516         if (IS_ERR(rt)) {
 517                 err = PTR_ERR(rt);
 518                 goto out;
 519         }
 520
 521         ipv6_addr_copy(&ifa->addr, addr);
 522
 523         spin_lock_init(&ifa->lock);
 524         init_timer(&ifa->timer);
 525         ifa->timer.data = (unsigned long) ifa;
 526         ifa->scope = scope;
 527         ifa->prefix_len = pfxlen;
 528         ifa->flags = flags | IFA_F_TENTATIVE;
 529         ifa->cstamp = ifa->tstamp = jiffies;
 530
 531         ifa->rt = rt;
 532
 533         /*
 534          * part one of RFC 4429, section 3.3
 535          * We should not configure an address as
 536          * optimistic if we do not yet know the link
 537          * layer address of our nexhop router
 538          */
 539
 540         if (rt->rt6i_nexthop == NULL)
 541                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 542
 543         ifa->idev = idev;
 544         in6_dev_hold(idev);
 545         /* For caller */
 546         in6_ifa_hold(ifa);
 547
 548         /* Add to big hash table */
 549         hash = ipv6_addr_hash(addr);
 550
 551         ifa->lst_next = inet6_addr_lst[hash];
 552         inet6_addr_lst[hash] = ifa;
 553         in6_ifa_hold(ifa);
 554         write_unlock(&addrconf_hash_lock);
 555
 556         write_lock(&idev->lock);
 557         /* Add to inet6_dev unicast addr list. */
 558         ipv6_link_dev_addr(idev, ifa);
 559
 560 #ifdef CONFIG_IPV6_PRIVACY
 561         if (ifa->flags&IFA_F_TEMPORARY) {
 562                 ifa->tmp_next = idev->tempaddr_list;
 563                 idev->tempaddr_list = ifa;
 564                 in6_ifa_hold(ifa);
 565         }
 566 #endif
 567
 568         in6_ifa_hold(ifa);
 569         write_unlock(&idev->lock);
 570 out2:
 571         rcu_read_unlock_bh();
 572
 573         if (likely(err == 0))
 574                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 575         else {
 576                 kfree(ifa);
 577                 ifa = ERR_PTR(err);
 578         }
 579
 580         return ifa;
 581 out:
 582         write_unlock(&addrconf_hash_lock);
 583         goto out2;
 584 }
 585
 586 /* This function wants to get referenced ifp and releases it before return */
 587
 588 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 589 {
 590         struct inet6_ifaddr *ifa, **ifap;
 591         struct inet6_dev *idev = ifp->idev;
 592         int hash;
 593         int deleted = 0, onlink = 0;
 594         unsigned long expires = jiffies;
 595
 596         hash = ipv6_addr_hash(&ifp->addr);
 597
 598         ifp->dead = 1;
 599
 600         write_lock_bh(&addrconf_hash_lock);
 601         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 602              ifap = &ifa->lst_next) {
 603                 if (ifa == ifp) {
 604                         *ifap = ifa->lst_next;
 605                         __in6_ifa_put(ifp);
 606                         ifa->lst_next = NULL;
 607                         break;
 608                 }
 609         }
 610         write_unlock_bh(&addrconf_hash_lock);
 611
 612         write_lock_bh(&idev->lock);
 613 #ifdef CONFIG_IPV6_PRIVACY
 614         if (ifp->flags&IFA_F_TEMPORARY) {
 615                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 616                      ifap = &ifa->tmp_next) {
 617                         if (ifa == ifp) {
 618                                 *ifap = ifa->tmp_next;
 619                                 if (ifp->ifpub) {
 620                                         in6_ifa_put(ifp->ifpub);
 621                                         ifp->ifpub = NULL;
 622                                 }
 623                                 __in6_ifa_put(ifp);
 624                                 ifa->tmp_next = NULL;
 625                                 break;
 626                         }
 627                 }
 628         }
 629 #endif
 630
 631         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 632                 if (ifa == ifp) {
 633                         *ifap = ifa->if_next;
 634                         __in6_ifa_put(ifp);
 635                         ifa->if_next = NULL;
 636                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 637                                 break;
 638                         deleted = 1;
 639                         continue;
 640                 } else if (ifp->flags & IFA_F_PERMANENT) {
 641                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 642                                               ifp->prefix_len)) {
 643                                 if (ifa->flags & IFA_F_PERMANENT) {
 644                                         onlink = 1;
 645                                         if (deleted)
 646                                                 break;
 647                                 } else {
 648                                         unsigned long lifetime;
 649
 650                                         if (!onlink)
 651                                                 onlink = -1;
 652
 653                                         spin_lock(&ifa->lock);
 654                                         lifetime = min_t(unsigned long,
 655                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 656                                         if (time_before(expires,
 657                                                         ifa->tstamp + lifetime * HZ))
 658                                                 expires = ifa->tstamp + lifetime * HZ;
 659                                         spin_unlock(&ifa->lock);
 660                                 }
 661                         }
 662                 }
 663                 ifap = &ifa->if_next;
 664         }
 665         write_unlock_bh(&idev->lock);
 666
 667         ipv6_ifa_notify(RTM_DELADDR, ifp);
 668
 669         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 670
 671         addrconf_del_timer(ifp);
 672
 673         /*
 674          * Purge or update corresponding prefix
 675          *
 676          * 1) we don't purge prefix here if address was not permanent.
 677          *    prefix is managed by its own lifetime.
 678          * 2) if there're no addresses, delete prefix.
 679          * 3) if there're still other permanent address(es),
 680          *    corresponding prefix is still permanent.
 681          * 4) otherwise, update prefix lifetime to the
 682          *    longest valid lifetime among the corresponding
 683          *    addresses on the device.
 684          *    Note: subsequent RA will update lifetime.
 685          *
 686          * --yoshfuji
 687          */
 688         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 689                 struct in6_addr prefix;
 690                 struct rt6_info *rt;
 691
 692                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 693                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 694
 695                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 696                         if (onlink == 0) {
 697                                 ip6_del_rt(rt);
 698                                 rt = NULL;
 699                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 700                                 rt->rt6i_expires = expires;
 701                                 rt->rt6i_flags |= RTF_EXPIRES;
 702                         }
 703                 }
 704                 dst_release(&rt->u.dst);
 705         }
 706
 707         in6_ifa_put(ifp);
 708 }
 709
 710 #ifdef CONFIG_IPV6_PRIVACY
 711 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 712 {
 713         struct inet6_dev *idev = ifp->idev;
 714         struct in6_addr addr, *tmpaddr;
 715         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 716         int tmp_plen;
 717         int ret = 0;
 718         int max_addresses;
 719         u32 addr_flags;
 720
 721         write_lock(&idev->lock);
 722         if (ift) {
 723                 spin_lock_bh(&ift->lock);
 724                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 725                 spin_unlock_bh(&ift->lock);
 726                 tmpaddr = &addr;
 727         } else {
 728                 tmpaddr = NULL;
 729         }
 730 retry:
 731         in6_dev_hold(idev);
 732         if (idev->cnf.use_tempaddr <= 0) {
 733                 write_unlock(&idev->lock);
 734                 printk(KERN_INFO
 735                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 736                 in6_dev_put(idev);
 737                 ret = -1;
 738                 goto out;
 739         }
 740         spin_lock_bh(&ifp->lock);
 741         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 742                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 743                 spin_unlock_bh(&ifp->lock);
 744                 write_unlock(&idev->lock);
 745                 printk(KERN_WARNING
 746                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 747                 in6_dev_put(idev);
 748                 ret = -1;
 749                 goto out;
 750         }
 751         in6_ifa_hold(ifp);
 752         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 753         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 754                 spin_unlock_bh(&ifp->lock);
 755                 write_unlock(&idev->lock);
 756                 printk(KERN_WARNING
 757                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 758                 in6_ifa_put(ifp);
 759                 in6_dev_put(idev);
 760                 ret = -1;
 761                 goto out;
 762         }
 763         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 764         tmp_valid_lft = min_t(__u32,
 765                               ifp->valid_lft,
 766                               idev->cnf.temp_valid_lft);
 767         tmp_prefered_lft = min_t(__u32,
 768                                  ifp->prefered_lft,
 769                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 770         tmp_plen = ifp->prefix_len;
 771         max_addresses = idev->cnf.max_addresses;
 772         tmp_cstamp = ifp->cstamp;
 773         tmp_tstamp = ifp->tstamp;
 774         spin_unlock_bh(&ifp->lock);
 775
 776         write_unlock(&idev->lock);
 777
 778         addr_flags = IFA_F_TEMPORARY;
 779         /* set in addrconf_prefix_rcv() */
 780         if (ifp->flags & IFA_F_OPTIMISTIC)
 781                 addr_flags |= IFA_F_OPTIMISTIC;
 782
 783         ift = !max_addresses ||
 784               ipv6_count_addresses(idev) < max_addresses ?
 785                 ipv6_add_addr(idev, &addr, tmp_plen,
 786                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 787                               addr_flags) : NULL;
 788         if (!ift || IS_ERR(ift)) {
 789                 in6_ifa_put(ifp);
 790                 in6_dev_put(idev);
 791                 printk(KERN_INFO
 792                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 793                 tmpaddr = &addr;
 794                 write_lock(&idev->lock);
 795                 goto retry;
 796         }
 797
 798         spin_lock_bh(&ift->lock);
 799         ift->ifpub = ifp;
 800         ift->valid_lft = tmp_valid_lft;
 801         ift->prefered_lft = tmp_prefered_lft;
 802         ift->cstamp = tmp_cstamp;
 803         ift->tstamp = tmp_tstamp;
 804         spin_unlock_bh(&ift->lock);
 805
 806         addrconf_dad_start(ift, 0);
 807         in6_ifa_put(ift);
 808         in6_dev_put(idev);
 809 out:
 810         return ret;
 811 }
 812 #endif
 813
 814 /*
 815  *      Choose an appropriate source address (RFC3484)
 816  */
 817 struct ipv6_saddr_score {
 818         int             addr_type;
 819         unsigned int    attrs;
 820         int             matchlen;
 821         int             scope;
 822         unsigned int    rule;
 823 };
 824
 825 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 826 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 827 #define IPV6_SADDR_SCORE_HOA            0x0008
 828 #define IPV6_SADDR_SCORE_OIF            0x0010
 829 #define IPV6_SADDR_SCORE_LABEL          0x0020
 830 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 831
 832 static inline int ipv6_saddr_preferred(int type)
 833 {
 834         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 835                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 836                 return 1;
 837         return 0;
 838 }
 839
 840 /* static matching label */
 841 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
 842 {
 843  /*
 844   *     prefix (longest match)  label
 845   *     -----------------------------
 846   *     ::1/128                 0
 847   *     ::/0                    1
 848   *     2002::/16               2
 849   *     ::/96                   3
 850   *     ::ffff:0:0/96           4
 851   *     fc00::/7                5
 852   *     2001::/32               6
 853   */
 854         if (type & IPV6_ADDR_LOOPBACK)
 855                 return 0;
 856         else if (type & IPV6_ADDR_COMPATv4)
 857                 return 3;
 858         else if (type & IPV6_ADDR_MAPPED)
 859                 return 4;
 860         else if (addr->s6_addr32[0] == htonl(0x20010000))
 861                 return 6;
 862         else if (addr->s6_addr16[0] == htons(0x2002))
 863                 return 2;
 864         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 865                 return 5;
 866         return 1;
 867 }
 868
 869 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 870                        struct in6_addr *daddr, struct in6_addr *saddr)
 871 {
 872         struct ipv6_saddr_score hiscore;
 873         struct inet6_ifaddr *ifa_result = NULL;
 874         int daddr_type = __ipv6_addr_type(daddr);
 875         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 876         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 877         struct net_device *dev;
 878
 879         memset(&hiscore, 0, sizeof(hiscore));
 880
 881         read_lock(&dev_base_lock);
 882         rcu_read_lock();
 883
 884         for (dev = dev_base; dev; dev=dev->next) {
 885                 struct inet6_dev *idev;
 886                 struct inet6_ifaddr *ifa;
 887
 888                 /* Rule 0: Candidate Source Address (section 4)
 889                  *  - multicast and link-local destination address,
 890                  *    the set of candidate source address MUST only
 891                  *    include addresses assigned to interfaces
 892                  *    belonging to the same link as the outgoing
 893                  *    interface.
 894                  * (- For site-local destination addresses, the
 895                  *    set of candidate source addresses MUST only
 896                  *    include addresses assigned to interfaces
 897                  *    belonging to the same site as the outgoing
 898                  *    interface.)
 899                  */
 900                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 901                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 902                     daddr_dev && dev != daddr_dev)
 903                         continue;
 904
 905                 idev = __in6_dev_get(dev);
 906                 if (!idev)
 907                         continue;
 908
 909                 read_lock_bh(&idev->lock);
 910                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 911                         struct ipv6_saddr_score score;
 912
 913                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 914
 915                         /* Rule 0:
 916                          * - Tentative Address (RFC2462 section 5.4)
 917                          *  - A tentative address is not considered
 918                          *    "assigned to an interface" in the traditional
 919                          *    sense, unless it is also flagged as optimistic.
 920                          * - Candidate Source Address (section 4)
 921                          *  - In any case, anycast addresses, multicast
 922                          *    addresses, and the unspecified address MUST
 923                          *    NOT be included in a candidate set.
 924                          */
 925                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 926                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 927                                 continue;
 928                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 929                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 930                                 LIMIT_NETDEBUG(KERN_DEBUG
 931                                                "ADDRCONF: unspecified / multicast address"
 932                                                "assigned as unicast address on %s",
 933                                                dev->name);
 934                                 continue;
 935                         }
 936
 937                         score.attrs = 0;
 938                         score.matchlen = 0;
 939                         score.scope = 0;
 940                         score.rule = 0;
 941
 942                         if (ifa_result == NULL) {
 943                                 /* record it if the first available entry */
 944                                 goto record_it;
 945                         }
 946
 947                         /* Rule 1: Prefer same address */
 948                         if (hiscore.rule < 1) {
 949                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 950                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 951                                 hiscore.rule++;
 952                         }
 953                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 954                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 955                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 956                                         score.rule = 1;
 957                                         goto record_it;
 958                                 }
 959                         } else {
 960                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 961                                         continue;
 962                         }
 963
 964                         /* Rule 2: Prefer appropriate scope */
 965                         if (hiscore.rule < 2) {
 966                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 967                                 hiscore.rule++;
 968                         }
 969                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 970                         if (hiscore.scope < score.scope) {
 971                                 if (hiscore.scope < daddr_scope) {
 972                                         score.rule = 2;
 973                                         goto record_it;
 974                                 } else
 975                                         continue;
 976                         } else if (score.scope < hiscore.scope) {
 977                                 if (score.scope < daddr_scope)
 978                                         break; /* addresses sorted by scope */
 979                                 else {
 980                                         score.rule = 2;
 981                                         goto record_it;
 982                                 }
 983                         }
 984
 985                         /* Rule 3: Avoid deprecated and optimistic addresses */
 986                         if (hiscore.rule < 3) {
 987                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 988                                    (((ifa_result->flags &
 989                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
 990                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 991                                 hiscore.rule++;
 992                         }
 993                         if (ipv6_saddr_preferred(score.addr_type) ||
 994                            (((ifa_result->flags &
 995                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
 996                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 997                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
 998                                         score.rule = 3;
 999                                         goto record_it;
1000                                 }
1001                         } else {
1002                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1003                                         continue;
1004                         }
1005
1006                         /* Rule 4: Prefer home address */
1007 #ifdef CONFIG_IPV6_MIP6
1008                         if (hiscore.rule < 4) {
1009                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1010                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1011                                 hiscore.rule++;
1012                         }
1013                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1014                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1015                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1016                                         score.rule = 4;
1017                                         goto record_it;
1018                                 }
1019                         } else {
1020                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1021                                         continue;
1022                         }
1023 #else
1024                         if (hiscore.rule < 4)
1025                                 hiscore.rule++;
1026 #endif
1027
1028                         /* Rule 5: Prefer outgoing interface */
1029                         if (hiscore.rule < 5) {
1030                                 if (daddr_dev == NULL ||
1031                                     daddr_dev == ifa_result->idev->dev)
1032                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1033                                 hiscore.rule++;
1034                         }
1035                         if (daddr_dev == NULL ||
1036                             daddr_dev == ifa->idev->dev) {
1037                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1038                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1039                                         score.rule = 5;
1040                                         goto record_it;
1041                                 }
1042                         } else {
1043                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1044                                         continue;
1045                         }
1046
1047                         /* Rule 6: Prefer matching label */
1048                         if (hiscore.rule < 6) {
1049                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1050                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1051                                 hiscore.rule++;
1052                         }
1053                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1054                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1055                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1056                                         score.rule = 6;
1057                                         goto record_it;
1058                                 }
1059                         } else {
1060                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1061                                         continue;
1062                         }
1063
1064 #ifdef CONFIG_IPV6_PRIVACY
1065                         /* Rule 7: Prefer public address
1066                          * Note: prefer temprary address if use_tempaddr >= 2
1067                          */
1068                         if (hiscore.rule < 7) {
1069                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1070                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1071                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1072                                 hiscore.rule++;
1073                         }
1074                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1075                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1076                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1077                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1078                                         score.rule = 7;
1079                                         goto record_it;
1080                                 }
1081                         } else {
1082                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1083                                         continue;
1084                         }
1085 #else
1086                         if (hiscore.rule < 7)
1087                                 hiscore.rule++;
1088 #endif
1089                         /* Rule 8: Use longest matching prefix */
1090                         if (hiscore.rule < 8) {
1091                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1092                                 hiscore.rule++;
1093                         }
1094                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1095                         if (score.matchlen > hiscore.matchlen) {
1096                                 score.rule = 8;
1097                                 goto record_it;
1098                         }
1099 #if 0
1100                         else if (score.matchlen < hiscore.matchlen)
1101                                 continue;
1102 #endif
1103
1104                         /* Final Rule: choose first available one */
1105                         continue;
1106 record_it:
1107                         if (ifa_result)
1108                                 in6_ifa_put(ifa_result);
1109                         in6_ifa_hold(ifa);
1110                         ifa_result = ifa;
1111                         hiscore = score;
1112                 }
1113                 read_unlock_bh(&idev->lock);
1114         }
1115         rcu_read_unlock();
1116         read_unlock(&dev_base_lock);
1117
1118         if (!ifa_result)
1119                 return -EADDRNOTAVAIL;
1120
1121         ipv6_addr_copy(saddr, &ifa_result->addr);
1122         in6_ifa_put(ifa_result);
1123         return 0;
1124 }
1125
1126
1127 int ipv6_get_saddr(struct dst_entry *dst,
1128                    struct in6_addr *daddr, struct in6_addr *saddr)
1129 {
1130         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1131 }
1132
1133 EXPORT_SYMBOL(ipv6_get_saddr);
1134
1135 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1136                     unsigned char banned_flags)
1137 {
1138         struct inet6_dev *idev;
1139         int err = -EADDRNOTAVAIL;
1140
1141         rcu_read_lock();
1142         if ((idev = __in6_dev_get(dev)) != NULL) {
1143                 struct inet6_ifaddr *ifp;
1144
1145                 read_lock_bh(&idev->lock);
1146                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1147                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1148                                 ipv6_addr_copy(addr, &ifp->addr);
1149                                 err = 0;
1150                                 break;
1151                         }
1152                 }
1153                 read_unlock_bh(&idev->lock);
1154         }
1155         rcu_read_unlock();
1156         return err;
1157 }
1158
1159 static int ipv6_count_addresses(struct inet6_dev *idev)
1160 {
1161         int cnt = 0;
1162         struct inet6_ifaddr *ifp;
1163
1164         read_lock_bh(&idev->lock);
1165         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1166                 cnt++;
1167         read_unlock_bh(&idev->lock);
1168         return cnt;
1169 }
1170
1171 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1172 {
1173         struct inet6_ifaddr * ifp;
1174         u8 hash = ipv6_addr_hash(addr);
1175
1176         read_lock_bh(&addrconf_hash_lock);
1177         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1178                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1179                     !(ifp->flags&IFA_F_TENTATIVE)) {
1180                         if (dev == NULL || ifp->idev->dev == dev ||
1181                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1182                                 break;
1183                 }
1184         }
1185         read_unlock_bh(&addrconf_hash_lock);
1186         return ifp != NULL;
1187 }
1188
1189 EXPORT_SYMBOL(ipv6_chk_addr);
1190
1191 static
1192 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1193 {
1194         struct inet6_ifaddr * ifp;
1195         u8 hash = ipv6_addr_hash(addr);
1196
1197         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1198                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1199                         if (dev == NULL || ifp->idev->dev == dev)
1200                                 break;
1201                 }
1202         }
1203         return ifp != NULL;
1204 }
1205
1206 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1207 {
1208         struct inet6_ifaddr * ifp;
1209         u8 hash = ipv6_addr_hash(addr);
1210
1211         read_lock_bh(&addrconf_hash_lock);
1212         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1213                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1214                         if (dev == NULL || ifp->idev->dev == dev ||
1215                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1216                                 in6_ifa_hold(ifp);
1217                                 break;
1218                         }
1219                 }
1220         }
1221         read_unlock_bh(&addrconf_hash_lock);
1222
1223         return ifp;
1224 }
1225
1226 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1227 {
1228         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1229         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1230         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1231         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1232         int sk_ipv6only = ipv6_only_sock(sk);
1233         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1234         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1235         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1236
1237         if (!sk2_rcv_saddr && !sk_ipv6only)
1238                 return 1;
1239
1240         if (addr_type2 == IPV6_ADDR_ANY &&
1241             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1242                 return 1;
1243
1244         if (addr_type == IPV6_ADDR_ANY &&
1245             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1246                 return 1;
1247
1248         if (sk2_rcv_saddr6 &&
1249             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1250                 return 1;
1251
1252         if (addr_type == IPV6_ADDR_MAPPED &&
1253             !sk2_ipv6only &&
1254             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1255                 return 1;
1256
1257         return 0;
1258 }
1259
1260 /* Gets referenced address, destroys ifaddr */
1261
1262 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1263 {
1264         if (ifp->flags&IFA_F_PERMANENT) {
1265                 spin_lock_bh(&ifp->lock);
1266                 addrconf_del_timer(ifp);
1267                 ifp->flags |= IFA_F_TENTATIVE;
1268                 spin_unlock_bh(&ifp->lock);
1269                 in6_ifa_put(ifp);
1270 #ifdef CONFIG_IPV6_PRIVACY
1271         } else if (ifp->flags&IFA_F_TEMPORARY) {
1272                 struct inet6_ifaddr *ifpub;
1273                 spin_lock_bh(&ifp->lock);
1274                 ifpub = ifp->ifpub;
1275                 if (ifpub) {
1276                         in6_ifa_hold(ifpub);
1277                         spin_unlock_bh(&ifp->lock);
1278                         ipv6_create_tempaddr(ifpub, ifp);
1279                         in6_ifa_put(ifpub);
1280                 } else {
1281                         spin_unlock_bh(&ifp->lock);
1282                 }
1283                 ipv6_del_addr(ifp);
1284 #endif
1285         } else
1286                 ipv6_del_addr(ifp);
1287 }
1288
1289 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1290 {
1291         if (net_ratelimit())
1292                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1293         addrconf_dad_stop(ifp);
1294 }
1295
1296 /* Join to solicited addr multicast group. */
1297
1298 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1299 {
1300         struct in6_addr maddr;
1301
1302         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1303                 return;
1304
1305         addrconf_addr_solict_mult(addr, &maddr);
1306         ipv6_dev_mc_inc(dev, &maddr);
1307 }
1308
1309 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1310 {
1311         struct in6_addr maddr;
1312
1313         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1314                 return;
1315
1316         addrconf_addr_solict_mult(addr, &maddr);
1317         __ipv6_dev_mc_dec(idev, &maddr);
1318 }
1319
1320 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1321 {
1322         struct in6_addr addr;
1323         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1324         if (ipv6_addr_any(&addr))
1325                 return;
1326         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1327 }
1328
1329 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1330 {
1331         struct in6_addr addr;
1332         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1333         if (ipv6_addr_any(&addr))
1334                 return;
1335         __ipv6_dev_ac_dec(ifp->idev, &addr);
1336 }
1337
1338 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1339 {
1340         if (dev->addr_len != ETH_ALEN)
1341                 return -1;
1342         memcpy(eui, dev->dev_addr, 3);
1343         memcpy(eui + 5, dev->dev_addr + 3, 3);
1344
1345         /*
1346          * The zSeries OSA network cards can be shared among various
1347          * OS instances, but the OSA cards have only one MAC address.
1348          * This leads to duplicate address conflicts in conjunction
1349          * with IPv6 if more than one instance uses the same card.
1350          *
1351          * The driver for these cards can deliver a unique 16-bit
1352          * identifier for each instance sharing the same card.  It is
1353          * placed instead of 0xFFFE in the interface identifier.  The
1354          * "u" bit of the interface identifier is not inverted in this
1355          * case.  Hence the resulting interface identifier has local
1356          * scope according to RFC2373.
1357          */
1358         if (dev->dev_id) {
1359                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1360                 eui[4] = dev->dev_id & 0xFF;
1361         } else {
1362                 eui[3] = 0xFF;
1363                 eui[4] = 0xFE;
1364                 eui[0] ^= 2;
1365         }
1366         return 0;
1367 }
1368
1369 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1370 {
1371         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1372         if (dev->addr_len != ARCNET_ALEN)
1373                 return -1;
1374         memset(eui, 0, 7);
1375         eui[7] = *(u8*)dev->dev_addr;
1376         return 0;
1377 }
1378
1379 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1380 {
1381         if (dev->addr_len != INFINIBAND_ALEN)
1382                 return -1;
1383         memcpy(eui, dev->dev_addr + 12, 8);
1384         eui[0] |= 2;
1385         return 0;
1386 }
1387
1388 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1389 {
1390         switch (dev->type) {
1391         case ARPHRD_ETHER:
1392         case ARPHRD_FDDI:
1393         case ARPHRD_IEEE802_TR:
1394                 return addrconf_ifid_eui48(eui, dev);
1395         case ARPHRD_ARCNET:
1396                 return addrconf_ifid_arcnet(eui, dev);
1397         case ARPHRD_INFINIBAND:
1398                 return addrconf_ifid_infiniband(eui, dev);
1399         }
1400         return -1;
1401 }
1402
1403 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1404 {
1405         int err = -1;
1406         struct inet6_ifaddr *ifp;
1407
1408         read_lock_bh(&idev->lock);
1409         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1410                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1411                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1412                         err = 0;
1413                         break;
1414                 }
1415         }
1416         read_unlock_bh(&idev->lock);
1417         return err;
1418 }
1419
1420 #ifdef CONFIG_IPV6_PRIVACY
1421 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1422 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1423 {
1424 regen:
1425         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1426         idev->rndid[0] &= ~0x02;
1427
1428         /*
1429          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1430          * check if generated address is not inappropriate
1431          *
1432          *  - Reserved subnet anycast (RFC 2526)
1433          *      11111101 11....11 1xxxxxxx
1434          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1435          *      00-00-5E-FE-xx-xx-xx-xx
1436          *  - value 0
1437          *  - XXX: already assigned to an address on the device
1438          */
1439         if (idev->rndid[0] == 0xfd &&
1440             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1441             (idev->rndid[7]&0x80))
1442                 goto regen;
1443         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1444                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1445                         goto regen;
1446                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1447                         goto regen;
1448         }
1449
1450         return 0;
1451 }
1452
1453 static void ipv6_regen_rndid(unsigned long data)
1454 {
1455         struct inet6_dev *idev = (struct inet6_dev *) data;
1456         unsigned long expires;
1457
1458         rcu_read_lock_bh();
1459         write_lock_bh(&idev->lock);
1460
1461         if (idev->dead)
1462                 goto out;
1463
1464         if (__ipv6_regen_rndid(idev) < 0)
1465                 goto out;
1466
1467         expires = jiffies +
1468                 idev->cnf.temp_prefered_lft * HZ -
1469                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1470         if (time_before(expires, jiffies)) {
1471                 printk(KERN_WARNING
1472                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1473                         idev->dev->name);
1474                 goto out;
1475         }
1476
1477         if (!mod_timer(&idev->regen_timer, expires))
1478                 in6_dev_hold(idev);
1479
1480 out:
1481         write_unlock_bh(&idev->lock);
1482         rcu_read_unlock_bh();
1483         in6_dev_put(idev);
1484 }
1485
1486 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1487         int ret = 0;
1488
1489         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1490                 ret = __ipv6_regen_rndid(idev);
1491         return ret;
1492 }
1493 #endif
1494
1495 /*
1496  *      Add prefix route.
1497  */
1498
1499 static void
1500 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1501                       unsigned long expires, u32 flags)
1502 {
1503         struct fib6_config cfg = {
1504                 .fc_table = RT6_TABLE_PREFIX,
1505                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1506                 .fc_ifindex = dev->ifindex,
1507                 .fc_expires = expires,
1508                 .fc_dst_len = plen,
1509                 .fc_flags = RTF_UP | flags,
1510         };
1511
1512         ipv6_addr_copy(&cfg.fc_dst, pfx);
1513
1514         /* Prevent useless cloning on PtP SIT.
1515            This thing is done here expecting that the whole
1516            class of non-broadcast devices need not cloning.
1517          */
1518 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1519         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1520                 cfg.fc_flags |= RTF_NONEXTHOP;
1521 #endif
1522
1523         ip6_route_add(&cfg);
1524 }
1525
1526 /* Create "default" multicast route to the interface */
1527
1528 static void addrconf_add_mroute(struct net_device *dev)
1529 {
1530         struct fib6_config cfg = {
1531                 .fc_table = RT6_TABLE_LOCAL,
1532                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1533                 .fc_ifindex = dev->ifindex,
1534                 .fc_dst_len = 8,
1535                 .fc_flags = RTF_UP,
1536         };
1537
1538         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1539
1540         ip6_route_add(&cfg);
1541 }
1542
1543 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1544 static void sit_route_add(struct net_device *dev)
1545 {
1546         struct fib6_config cfg = {
1547                 .fc_table = RT6_TABLE_MAIN,
1548                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1549                 .fc_ifindex = dev->ifindex,
1550                 .fc_dst_len = 96,
1551                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1552         };
1553
1554         /* prefix length - 96 bits "::d.d.d.d" */
1555         ip6_route_add(&cfg);
1556 }
1557 #endif
1558
1559 static void addrconf_add_lroute(struct net_device *dev)
1560 {
1561         struct in6_addr addr;
1562
1563         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1564         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1565 }
1566
1567 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1568 {
1569         struct inet6_dev *idev;
1570
1571         ASSERT_RTNL();
1572
1573         if ((idev = ipv6_find_idev(dev)) == NULL)
1574                 return NULL;
1575
1576         /* Add default multicast route */
1577         addrconf_add_mroute(dev);
1578
1579         /* Add link local route */
1580         addrconf_add_lroute(dev);
1581         return idev;
1582 }
1583
1584 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1585 {
1586         struct prefix_info *pinfo;
1587         __u32 valid_lft;
1588         __u32 prefered_lft;
1589         int addr_type;
1590         unsigned long rt_expires;
1591         struct inet6_dev *in6_dev;
1592
1593         pinfo = (struct prefix_info *) opt;
1594
1595         if (len < sizeof(struct prefix_info)) {
1596                 ADBG(("addrconf: prefix option too short\n"));
1597                 return;
1598         }
1599
1600         /*
1601          *      Validation checks ([ADDRCONF], page 19)
1602          */
1603
1604         addr_type = ipv6_addr_type(&pinfo->prefix);
1605
1606         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1607                 return;
1608
1609         valid_lft = ntohl(pinfo->valid);
1610         prefered_lft = ntohl(pinfo->prefered);
1611
1612         if (prefered_lft > valid_lft) {
1613                 if (net_ratelimit())
1614                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1615                 return;
1616         }
1617
1618         in6_dev = in6_dev_get(dev);
1619
1620         if (in6_dev == NULL) {
1621                 if (net_ratelimit())
1622                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1623                 return;
1624         }
1625
1626         /*
1627          *      Two things going on here:
1628          *      1) Add routes for on-link prefixes
1629          *      2) Configure prefixes with the auto flag set
1630          */
1631
1632         /* Avoid arithmetic overflow. Really, we could
1633            save rt_expires in seconds, likely valid_lft,
1634            but it would require division in fib gc, that it
1635            not good.
1636          */
1637         if (valid_lft >= 0x7FFFFFFF/HZ)
1638                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1639         else
1640                 rt_expires = valid_lft * HZ;
1641
1642         /*
1643          * We convert this (in jiffies) to clock_t later.
1644          * Avoid arithmetic overflow there as well.
1645          * Overflow can happen only if HZ < USER_HZ.
1646          */
1647         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1648                 rt_expires = 0x7FFFFFFF / USER_HZ;
1649
1650         if (pinfo->onlink) {
1651                 struct rt6_info *rt;
1652                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1653
1654                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1655                         if (rt->rt6i_flags&RTF_EXPIRES) {
1656                                 if (valid_lft == 0) {
1657                                         ip6_del_rt(rt);
1658                                         rt = NULL;
1659                                 } else {
1660                                         rt->rt6i_expires = jiffies + rt_expires;
1661                                 }
1662                         }
1663                 } else if (valid_lft) {
1664                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1665                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1666                 }
1667                 if (rt)
1668                         dst_release(&rt->u.dst);
1669         }
1670
1671         /* Try to figure out our local address for this prefix */
1672
1673         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1674                 struct inet6_ifaddr * ifp;
1675                 struct in6_addr addr;
1676                 int create = 0, update_lft = 0;
1677
1678                 if (pinfo->prefix_len == 64) {
1679                         memcpy(&addr, &pinfo->prefix, 8);
1680                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1681                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1682                                 in6_dev_put(in6_dev);
1683                                 return;
1684                         }
1685                         goto ok;
1686                 }
1687                 if (net_ratelimit())
1688                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1689                                pinfo->prefix_len);
1690                 in6_dev_put(in6_dev);
1691                 return;
1692
1693 ok:
1694
1695                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1696
1697                 if (ifp == NULL && valid_lft) {
1698                         int max_addresses = in6_dev->cnf.max_addresses;
1699                         u32 addr_flags = 0;
1700
1701 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1702                         if (in6_dev->cnf.optimistic_dad &&
1703                             !ipv6_devconf.forwarding)
1704                                 addr_flags = IFA_F_OPTIMISTIC;
1705 #endif
1706
1707                         /* Do not allow to create too much of autoconfigured
1708                          * addresses; this would be too easy way to crash kernel.
1709                          */
1710                         if (!max_addresses ||
1711                             ipv6_count_addresses(in6_dev) < max_addresses)
1712                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1713                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1714                                                     addr_flags);
1715
1716                         if (!ifp || IS_ERR(ifp)) {
1717                                 in6_dev_put(in6_dev);
1718                                 return;
1719                         }
1720
1721                         update_lft = create = 1;
1722                         ifp->cstamp = jiffies;
1723                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1724                 }
1725
1726                 if (ifp) {
1727                         int flags;
1728                         unsigned long now;
1729 #ifdef CONFIG_IPV6_PRIVACY
1730                         struct inet6_ifaddr *ift;
1731 #endif
1732                         u32 stored_lft;
1733
1734                         /* update lifetime (RFC2462 5.5.3 e) */
1735                         spin_lock(&ifp->lock);
1736                         now = jiffies;
1737                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1738                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1739                         else
1740                                 stored_lft = 0;
1741                         if (!update_lft && stored_lft) {
1742                                 if (valid_lft > MIN_VALID_LIFETIME ||
1743                                     valid_lft > stored_lft)
1744                                         update_lft = 1;
1745                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1746                                         /* valid_lft <= stored_lft is always true */
1747                                         /* XXX: IPsec */
1748                                         update_lft = 0;
1749                                 } else {
1750                                         valid_lft = MIN_VALID_LIFETIME;
1751                                         if (valid_lft < prefered_lft)
1752                                                 prefered_lft = valid_lft;
1753                                         update_lft = 1;
1754                                 }
1755                         }
1756
1757                         if (update_lft) {
1758                                 ifp->valid_lft = valid_lft;
1759                                 ifp->prefered_lft = prefered_lft;
1760                                 ifp->tstamp = now;
1761                                 flags = ifp->flags;
1762                                 ifp->flags &= ~IFA_F_DEPRECATED;
1763                                 spin_unlock(&ifp->lock);
1764
1765                                 if (!(flags&IFA_F_TENTATIVE))
1766                                         ipv6_ifa_notify(0, ifp);
1767                         } else
1768                                 spin_unlock(&ifp->lock);
1769
1770 #ifdef CONFIG_IPV6_PRIVACY
1771                         read_lock_bh(&in6_dev->lock);
1772                         /* update all temporary addresses in the list */
1773                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1774                                 /*
1775                                  * When adjusting the lifetimes of an existing
1776                                  * temporary address, only lower the lifetimes.
1777                                  * Implementations must not increase the
1778                                  * lifetimes of an existing temporary address
1779                                  * when processing a Prefix Information Option.
1780                                  */
1781                                 spin_lock(&ift->lock);
1782                                 flags = ift->flags;
1783                                 if (ift->valid_lft > valid_lft &&
1784                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1785                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1786                                 if (ift->prefered_lft > prefered_lft &&
1787                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1788                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1789                                 spin_unlock(&ift->lock);
1790                                 if (!(flags&IFA_F_TENTATIVE))
1791                                         ipv6_ifa_notify(0, ift);
1792                         }
1793
1794                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1795                                 /*
1796                                  * When a new public address is created as described in [ADDRCONF],
1797                                  * also create a new temporary address.
1798                                  */
1799                                 read_unlock_bh(&in6_dev->lock);
1800                                 ipv6_create_tempaddr(ifp, NULL);
1801                         } else {
1802                                 read_unlock_bh(&in6_dev->lock);
1803                         }
1804 #endif
1805                         in6_ifa_put(ifp);
1806                         addrconf_verify(0);
1807                 }
1808         }
1809         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1810         in6_dev_put(in6_dev);
1811 }
1812
1813 /*
1814  *      Set destination address.
1815  *      Special case for SIT interfaces where we create a new "virtual"
1816  *      device.
1817  */
1818 int addrconf_set_dstaddr(void __user *arg)
1819 {
1820         struct in6_ifreq ireq;
1821         struct net_device *dev;
1822         int err = -EINVAL;
1823
1824         rtnl_lock();
1825
1826         err = -EFAULT;
1827         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1828                 goto err_exit;
1829
1830         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1831
1832         err = -ENODEV;
1833         if (dev == NULL)
1834                 goto err_exit;
1835
1836 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1837         if (dev->type == ARPHRD_SIT) {
1838                 struct ifreq ifr;
1839                 mm_segment_t    oldfs;
1840                 struct ip_tunnel_parm p;
1841
1842                 err = -EADDRNOTAVAIL;
1843                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1844                         goto err_exit;
1845
1846                 memset(&p, 0, sizeof(p));
1847                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1848                 p.iph.saddr = 0;
1849                 p.iph.version = 4;
1850                 p.iph.ihl = 5;
1851                 p.iph.protocol = IPPROTO_IPV6;
1852                 p.iph.ttl = 64;
1853                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1854
1855                 oldfs = get_fs(); set_fs(KERNEL_DS);
1856                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1857                 set_fs(oldfs);
1858
1859                 if (err == 0) {
1860                         err = -ENOBUFS;
1861                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1862                                 goto err_exit;
1863                         err = dev_open(dev);
1864                 }
1865         }
1866 #endif
1867
1868 err_exit:
1869         rtnl_unlock();
1870         return err;
1871 }
1872
1873 /*
1874  *      Manual configuration of address on an interface
1875  */
1876 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1877                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1878 {
1879         struct inet6_ifaddr *ifp;
1880         struct inet6_dev *idev;
1881         struct net_device *dev;
1882         int scope;
1883         u32 flags = RTF_EXPIRES;
1884
1885         ASSERT_RTNL();
1886
1887         /* check the lifetime */
1888         if (!valid_lft || prefered_lft > valid_lft)
1889                 return -EINVAL;
1890
1891         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1892                 return -ENODEV;
1893
1894         if ((idev = addrconf_add_dev(dev)) == NULL)
1895                 return -ENOBUFS;
1896
1897         scope = ipv6_addr_scope(pfx);
1898
1899         if (valid_lft == INFINITY_LIFE_TIME) {
1900                 ifa_flags |= IFA_F_PERMANENT;
1901                 flags = 0;
1902         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1903                 valid_lft = 0x7FFFFFFF/HZ;
1904
1905         if (prefered_lft == 0)
1906                 ifa_flags |= IFA_F_DEPRECATED;
1907         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1908                  (prefered_lft != INFINITY_LIFE_TIME))
1909                 prefered_lft = 0x7FFFFFFF/HZ;
1910
1911         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1912
1913         if (!IS_ERR(ifp)) {
1914                 spin_lock_bh(&ifp->lock);
1915                 ifp->valid_lft = valid_lft;
1916                 ifp->prefered_lft = prefered_lft;
1917                 ifp->tstamp = jiffies;
1918                 spin_unlock_bh(&ifp->lock);
1919
1920                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1921                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1922                 /*
1923                  * Note that section 3.1 of RFC 4429 indicates
1924                  * that the Optimistic flag should not be set for
1925                  * manually configured addresses
1926                  */
1927                 addrconf_dad_start(ifp, 0);
1928                 in6_ifa_put(ifp);
1929                 addrconf_verify(0);
1930                 return 0;
1931         }
1932
1933         return PTR_ERR(ifp);
1934 }
1935
1936 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1937 {
1938         struct inet6_ifaddr *ifp;
1939         struct inet6_dev *idev;
1940         struct net_device *dev;
1941
1942         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1943                 return -ENODEV;
1944
1945         if ((idev = __in6_dev_get(dev)) == NULL)
1946                 return -ENXIO;
1947
1948         read_lock_bh(&idev->lock);
1949         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1950                 if (ifp->prefix_len == plen &&
1951                     ipv6_addr_equal(pfx, &ifp->addr)) {
1952                         in6_ifa_hold(ifp);
1953                         read_unlock_bh(&idev->lock);
1954
1955                         ipv6_del_addr(ifp);
1956
1957                         /* If the last address is deleted administratively,
1958                            disable IPv6 on this interface.
1959                          */
1960                         if (idev->addr_list == NULL)
1961                                 addrconf_ifdown(idev->dev, 1);
1962                         return 0;
1963                 }
1964         }
1965         read_unlock_bh(&idev->lock);
1966         return -EADDRNOTAVAIL;
1967 }
1968
1969
1970 int addrconf_add_ifaddr(void __user *arg)
1971 {
1972         struct in6_ifreq ireq;
1973         int err;
1974
1975         if (!capable(CAP_NET_ADMIN))
1976                 return -EPERM;
1977
1978         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1979                 return -EFAULT;
1980
1981         rtnl_lock();
1982         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1983                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1984         rtnl_unlock();
1985         return err;
1986 }
1987
1988 int addrconf_del_ifaddr(void __user *arg)
1989 {
1990         struct in6_ifreq ireq;
1991         int err;
1992
1993         if (!capable(CAP_NET_ADMIN))
1994                 return -EPERM;
1995
1996         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1997                 return -EFAULT;
1998
1999         rtnl_lock();
2000         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2001         rtnl_unlock();
2002         return err;
2003 }
2004
2005 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2006 static void sit_add_v4_addrs(struct inet6_dev *idev)
2007 {
2008         struct inet6_ifaddr * ifp;
2009         struct in6_addr addr;
2010         struct net_device *dev;
2011         int scope;
2012
2013         ASSERT_RTNL();
2014
2015         memset(&addr, 0, sizeof(struct in6_addr));
2016         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2017
2018         if (idev->dev->flags&IFF_POINTOPOINT) {
2019                 addr.s6_addr32[0] = htonl(0xfe800000);
2020                 scope = IFA_LINK;
2021         } else {
2022                 scope = IPV6_ADDR_COMPATv4;
2023         }
2024
2025         if (addr.s6_addr32[3]) {
2026                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2027                 if (!IS_ERR(ifp)) {
2028                         spin_lock_bh(&ifp->lock);
2029                         ifp->flags &= ~IFA_F_TENTATIVE;
2030                         spin_unlock_bh(&ifp->lock);
2031                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2032                         in6_ifa_put(ifp);
2033                 }
2034                 return;
2035         }
2036
2037         for (dev = dev_base; dev != NULL; dev = dev->next) {
2038                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2039                 if (in_dev && (dev->flags & IFF_UP)) {
2040                         struct in_ifaddr * ifa;
2041
2042                         int flag = scope;
2043
2044                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2045                                 int plen;
2046
2047                                 addr.s6_addr32[3] = ifa->ifa_local;
2048
2049                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2050                                         continue;
2051                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2052                                         if (idev->dev->flags&IFF_POINTOPOINT)
2053                                                 continue;
2054                                         flag |= IFA_HOST;
2055                                 }
2056                                 if (idev->dev->flags&IFF_POINTOPOINT)
2057                                         plen = 64;
2058                                 else
2059                                         plen = 96;
2060
2061                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2062                                                     IFA_F_PERMANENT);
2063                                 if (!IS_ERR(ifp)) {
2064                                         spin_lock_bh(&ifp->lock);
2065                                         ifp->flags &= ~IFA_F_TENTATIVE;
2066                                         spin_unlock_bh(&ifp->lock);
2067                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2068                                         in6_ifa_put(ifp);
2069                                 }
2070                         }
2071                 }
2072         }
2073 }
2074 #endif
2075
2076 static void init_loopback(struct net_device *dev)
2077 {
2078         struct inet6_dev  *idev;
2079         struct inet6_ifaddr * ifp;
2080
2081         /* ::1 */
2082
2083         ASSERT_RTNL();
2084
2085         if ((idev = ipv6_find_idev(dev)) == NULL) {
2086                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2087                 return;
2088         }
2089
2090         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2091         if (!IS_ERR(ifp)) {
2092                 spin_lock_bh(&ifp->lock);
2093                 ifp->flags &= ~IFA_F_TENTATIVE;
2094                 spin_unlock_bh(&ifp->lock);
2095                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2096                 in6_ifa_put(ifp);
2097         }
2098 }
2099
2100 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2101 {
2102         struct inet6_ifaddr * ifp;
2103         u32 addr_flags = IFA_F_PERMANENT;
2104
2105 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2106         if (idev->cnf.optimistic_dad &&
2107             !ipv6_devconf.forwarding)
2108                 addr_flags |= IFA_F_OPTIMISTIC;
2109 #endif
2110
2111
2112         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2113         if (!IS_ERR(ifp)) {
2114                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2115                 addrconf_dad_start(ifp, 0);
2116                 in6_ifa_put(ifp);
2117         }
2118 }
2119
2120 static void addrconf_dev_config(struct net_device *dev)
2121 {
2122         struct in6_addr addr;
2123         struct inet6_dev    * idev;
2124
2125         ASSERT_RTNL();
2126
2127         if ((dev->type != ARPHRD_ETHER) &&
2128             (dev->type != ARPHRD_FDDI) &&
2129             (dev->type != ARPHRD_IEEE802_TR) &&
2130             (dev->type != ARPHRD_ARCNET) &&
2131             (dev->type != ARPHRD_INFINIBAND)) {
2132                 /* Alas, we support only Ethernet autoconfiguration. */
2133                 return;
2134         }
2135
2136         idev = addrconf_add_dev(dev);
2137         if (idev == NULL)
2138                 return;
2139
2140         memset(&addr, 0, sizeof(struct in6_addr));
2141         addr.s6_addr32[0] = htonl(0xFE800000);
2142
2143         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2144                 addrconf_add_linklocal(idev, &addr);
2145 }
2146
2147 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2148 static void addrconf_sit_config(struct net_device *dev)
2149 {
2150         struct inet6_dev *idev;
2151
2152         ASSERT_RTNL();
2153
2154         /*
2155          * Configure the tunnel with one of our IPv4
2156          * addresses... we should configure all of
2157          * our v4 addrs in the tunnel
2158          */
2159
2160         if ((idev = ipv6_find_idev(dev)) == NULL) {
2161                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2162                 return;
2163         }
2164
2165         sit_add_v4_addrs(idev);
2166
2167         if (dev->flags&IFF_POINTOPOINT) {
2168                 addrconf_add_mroute(dev);
2169                 addrconf_add_lroute(dev);
2170         } else
2171                 sit_route_add(dev);
2172 }
2173 #endif
2174
2175 static inline int
2176 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2177 {
2178         struct in6_addr lladdr;
2179
2180         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2181                 addrconf_add_linklocal(idev, &lladdr);
2182                 return 0;
2183         }
2184         return -1;
2185 }
2186
2187 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2188 {
2189         struct net_device *link_dev;
2190
2191         /* first try to inherit the link-local address from the link device */
2192         if (idev->dev->iflink &&
2193             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2194                 if (!ipv6_inherit_linklocal(idev, link_dev))
2195                         return;
2196         }
2197         /* then try to inherit it from any device */
2198         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2199                 if (!ipv6_inherit_linklocal(idev, link_dev))
2200                         return;
2201         }
2202         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2203 }
2204
2205 /*
2206  * Autoconfigure tunnel with a link-local address so routing protocols,
2207  * DHCPv6, MLD etc. can be run over the virtual link
2208  */
2209
2210 static void addrconf_ip6_tnl_config(struct net_device *dev)
2211 {
2212         struct inet6_dev *idev;
2213
2214         ASSERT_RTNL();
2215
2216         if ((idev = addrconf_add_dev(dev)) == NULL) {
2217                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2218                 return;
2219         }
2220         ip6_tnl_add_linklocal(idev);
2221 }
2222
2223 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2224                            void * data)
2225 {
2226         struct net_device *dev = (struct net_device *) data;
2227         struct inet6_dev *idev = __in6_dev_get(dev);
2228         int run_pending = 0;
2229
2230         switch(event) {
2231         case NETDEV_REGISTER:
2232                 if (!idev) {
2233                         idev = ipv6_add_dev(dev);
2234                         if (!idev)
2235                                 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2236                                         dev->name);
2237                 }
2238                 break;
2239         case NETDEV_UP:
2240         case NETDEV_CHANGE:
2241                 if (event == NETDEV_UP) {
2242                         if (!netif_carrier_ok(dev)) {
2243                                 /* device is not ready yet. */
2244                                 printk(KERN_INFO
2245                                         "ADDRCONF(NETDEV_UP): %s: "
2246                                         "link is not ready\n",
2247                                         dev->name);
2248                                 break;
2249                         }
2250
2251                         if (idev)
2252                                 idev->if_flags |= IF_READY;
2253                 } else {
2254                         if (!netif_carrier_ok(dev)) {
2255                                 /* device is still not ready. */
2256                                 break;
2257                         }
2258
2259                         if (idev) {
2260                                 if (idev->if_flags & IF_READY) {
2261                                         /* device is already configured. */
2262                                         break;
2263                                 }
2264                                 idev->if_flags |= IF_READY;
2265                         }
2266
2267                         printk(KERN_INFO
2268                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2269                                         "link becomes ready\n",
2270                                         dev->name);
2271
2272                         run_pending = 1;
2273                 }
2274
2275                 switch(dev->type) {
2276 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2277                 case ARPHRD_SIT:
2278                         addrconf_sit_config(dev);
2279                         break;
2280 #endif
2281                 case ARPHRD_TUNNEL6:
2282                         addrconf_ip6_tnl_config(dev);
2283                         break;
2284                 case ARPHRD_LOOPBACK:
2285                         init_loopback(dev);
2286                         break;
2287
2288                 default:
2289                         addrconf_dev_config(dev);
2290                         break;
2291                 };
2292                 if (idev) {
2293                         if (run_pending)
2294                                 addrconf_dad_run(idev);
2295
2296                         /* If the MTU changed during the interface down, when the
2297                            interface up, the changed MTU must be reflected in the
2298                            idev as well as routers.
2299                          */
2300                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2301                                 rt6_mtu_change(dev, dev->mtu);
2302                                 idev->cnf.mtu6 = dev->mtu;
2303                         }
2304                         idev->tstamp = jiffies;
2305                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2306                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2307                            stop IPv6 on this interface.
2308                          */
2309                         if (dev->mtu < IPV6_MIN_MTU)
2310                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2311                 }
2312                 break;
2313
2314         case NETDEV_CHANGEMTU:
2315                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2316                         rt6_mtu_change(dev, dev->mtu);
2317                         idev->cnf.mtu6 = dev->mtu;
2318                         break;
2319                 }
2320
2321                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2322
2323         case NETDEV_DOWN:
2324         case NETDEV_UNREGISTER:
2325                 /*
2326                  *      Remove all addresses from this interface.
2327                  */
2328                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2329                 break;
2330
2331         case NETDEV_CHANGENAME:
2332 #ifdef CONFIG_SYSCTL
2333                 if (idev) {
2334                         addrconf_sysctl_unregister(&idev->cnf);
2335                         neigh_sysctl_unregister(idev->nd_parms);
2336                         neigh_sysctl_register(dev, idev->nd_parms,
2337                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2338                                               &ndisc_ifinfo_sysctl_change,
2339                                               NULL);
2340                         addrconf_sysctl_register(idev, &idev->cnf);
2341                 }
2342 #endif
2343                 break;
2344         };
2345
2346         return NOTIFY_OK;
2347 }
2348
2349 /*
2350  *      addrconf module should be notified of a device going up
2351  */
2352 static struct notifier_block ipv6_dev_notf = {
2353         .notifier_call = addrconf_notify,
2354         .priority = 0
2355 };
2356
2357 static int addrconf_ifdown(struct net_device *dev, int how)
2358 {
2359         struct inet6_dev *idev;
2360         struct inet6_ifaddr *ifa, **bifa;
2361         int i;
2362
2363         ASSERT_RTNL();
2364
2365         if (dev == &loopback_dev && how == 1)
2366                 how = 0;
2367
2368         rt6_ifdown(dev);
2369         neigh_ifdown(&nd_tbl, dev);
2370
2371         idev = __in6_dev_get(dev);
2372         if (idev == NULL)
2373                 return -ENODEV;
2374
2375         /* Step 1: remove reference to ipv6 device from parent device.
2376                    Do not dev_put!
2377          */
2378         if (how == 1) {
2379                 idev->dead = 1;
2380
2381                 /* protected by rtnl_lock */
2382                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2383
2384                 /* Step 1.5: remove snmp6 entry */
2385                 snmp6_unregister_dev(idev);
2386
2387         }
2388
2389         /* Step 2: clear hash table */
2390         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2391                 bifa = &inet6_addr_lst[i];
2392
2393                 write_lock_bh(&addrconf_hash_lock);
2394                 while ((ifa = *bifa) != NULL) {
2395                         if (ifa->idev == idev) {
2396                                 *bifa = ifa->lst_next;
2397                                 ifa->lst_next = NULL;
2398                                 addrconf_del_timer(ifa);
2399                                 in6_ifa_put(ifa);
2400                                 continue;
2401                         }
2402                         bifa = &ifa->lst_next;
2403                 }
2404                 write_unlock_bh(&addrconf_hash_lock);
2405         }
2406
2407         write_lock_bh(&idev->lock);
2408
2409         /* Step 3: clear flags for stateless addrconf */
2410         if (how != 1)
2411                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2412
2413         /* Step 4: clear address list */
2414 #ifdef CONFIG_IPV6_PRIVACY
2415         if (how == 1 && del_timer(&idev->regen_timer))
2416                 in6_dev_put(idev);
2417
2418         /* clear tempaddr list */
2419         while ((ifa = idev->tempaddr_list) != NULL) {
2420                 idev->tempaddr_list = ifa->tmp_next;
2421                 ifa->tmp_next = NULL;
2422                 ifa->dead = 1;
2423                 write_unlock_bh(&idev->lock);
2424                 spin_lock_bh(&ifa->lock);
2425
2426                 if (ifa->ifpub) {
2427                         in6_ifa_put(ifa->ifpub);
2428                         ifa->ifpub = NULL;
2429                 }
2430                 spin_unlock_bh(&ifa->lock);
2431                 in6_ifa_put(ifa);
2432                 write_lock_bh(&idev->lock);
2433         }
2434 #endif
2435         while ((ifa = idev->addr_list) != NULL) {
2436                 idev->addr_list = ifa->if_next;
2437                 ifa->if_next = NULL;
2438                 ifa->dead = 1;
2439                 addrconf_del_timer(ifa);
2440                 write_unlock_bh(&idev->lock);
2441
2442                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2443                 in6_ifa_put(ifa);
2444
2445                 write_lock_bh(&idev->lock);
2446         }
2447         write_unlock_bh(&idev->lock);
2448
2449         /* Step 5: Discard multicast list */
2450
2451         if (how == 1)
2452                 ipv6_mc_destroy_dev(idev);
2453         else
2454                 ipv6_mc_down(idev);
2455
2456         /* Step 5: netlink notification of this interface */
2457         idev->tstamp = jiffies;
2458         inet6_ifinfo_notify(RTM_DELLINK, idev);
2459
2460         /* Shot the device (if unregistered) */
2461
2462         if (how == 1) {
2463 #ifdef CONFIG_SYSCTL
2464                 addrconf_sysctl_unregister(&idev->cnf);
2465                 neigh_sysctl_unregister(idev->nd_parms);
2466 #endif
2467                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2468                 neigh_ifdown(&nd_tbl, dev);
2469                 in6_dev_put(idev);
2470         }
2471         return 0;
2472 }
2473
2474 static void addrconf_rs_timer(unsigned long data)
2475 {
2476         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2477
2478         if (ifp->idev->cnf.forwarding)
2479                 goto out;
2480
2481         if (ifp->idev->if_flags & IF_RA_RCVD) {
2482                 /*
2483                  *      Announcement received after solicitation
2484                  *      was sent
2485                  */
2486                 goto out;
2487         }
2488
2489         spin_lock(&ifp->lock);
2490         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2491                 struct in6_addr all_routers;
2492
2493                 /* The wait after the last probe can be shorter */
2494                 addrconf_mod_timer(ifp, AC_RS,
2495                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2496                                    ifp->idev->cnf.rtr_solicit_delay :
2497                                    ifp->idev->cnf.rtr_solicit_interval);
2498                 spin_unlock(&ifp->lock);
2499
2500                 ipv6_addr_all_routers(&all_routers);
2501
2502                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2503         } else {
2504                 spin_unlock(&ifp->lock);
2505                 /*
2506                  * Note: we do not support deprecated "all on-link"
2507                  * assumption any longer.
2508                  */
2509                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2510                        ifp->idev->dev->name);
2511         }
2512
2513 out:
2514         in6_ifa_put(ifp);
2515 }
2516
2517 /*
2518  *      Duplicate Address Detection
2519  */
2520 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2521 {
2522         unsigned long rand_num;
2523         struct inet6_dev *idev = ifp->idev;
2524
2525         if (ifp->flags & IFA_F_OPTIMISTIC)
2526                 rand_num = 0;
2527         else
2528                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2529
2530         ifp->probes = idev->cnf.dad_transmits;
2531         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2532 }
2533
2534 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2535 {
2536         struct inet6_dev *idev = ifp->idev;
2537         struct net_device *dev = idev->dev;
2538
2539         addrconf_join_solict(dev, &ifp->addr);
2540
2541         net_srandom(ifp->addr.s6_addr32[3]);
2542
2543         read_lock_bh(&idev->lock);
2544         if (ifp->dead)
2545                 goto out;
2546         spin_lock_bh(&ifp->lock);
2547
2548         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2549             !(ifp->flags&IFA_F_TENTATIVE) ||
2550             ifp->flags & IFA_F_NODAD) {
2551                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2552                 spin_unlock_bh(&ifp->lock);
2553                 read_unlock_bh(&idev->lock);
2554
2555                 addrconf_dad_completed(ifp);
2556                 return;
2557         }
2558
2559         if (!(idev->if_flags & IF_READY)) {
2560                 spin_unlock_bh(&ifp->lock);
2561                 read_unlock_bh(&idev->lock);
2562                 /*
2563                  * If the defice is not ready:
2564                  * - keep it tentative if it is a permanent address.
2565                  * - otherwise, kill it.
2566                  */
2567                 in6_ifa_hold(ifp);
2568                 addrconf_dad_stop(ifp);
2569                 return;
2570         }
2571
2572         /*
2573          * Optimistic nodes can start receiving
2574          * Frames right away
2575          */
2576         if(ifp->flags & IFA_F_OPTIMISTIC)
2577                 ip6_ins_rt(ifp->rt);
2578
2579         addrconf_dad_kick(ifp);
2580         spin_unlock_bh(&ifp->lock);
2581 out:
2582         read_unlock_bh(&idev->lock);
2583 }
2584
2585 static void addrconf_dad_timer(unsigned long data)
2586 {
2587         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2588         struct inet6_dev *idev = ifp->idev;
2589         struct in6_addr unspec;
2590         struct in6_addr mcaddr;
2591
2592         read_lock_bh(&idev->lock);
2593         if (idev->dead) {
2594                 read_unlock_bh(&idev->lock);
2595                 goto out;
2596         }
2597         spin_lock_bh(&ifp->lock);
2598         if (ifp->probes == 0) {
2599                 /*
2600                  * DAD was successful
2601                  */
2602
2603                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2604                 spin_unlock_bh(&ifp->lock);
2605                 read_unlock_bh(&idev->lock);
2606
2607                 addrconf_dad_completed(ifp);
2608
2609                 goto out;
2610         }
2611
2612         ifp->probes--;
2613         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2614         spin_unlock_bh(&ifp->lock);
2615         read_unlock_bh(&idev->lock);
2616
2617         /* send a neighbour solicitation for our addr */
2618         memset(&unspec, 0, sizeof(unspec));
2619         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2620         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2621 out:
2622         in6_ifa_put(ifp);
2623 }
2624
2625 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2626 {
2627         struct net_device *     dev = ifp->idev->dev;
2628
2629         /*
2630          *      Configure the address for reception. Now it is valid.
2631          */
2632
2633         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2634
2635         /* If added prefix is link local and forwarding is off,
2636            start sending router solicitations.
2637          */
2638
2639         if (ifp->idev->cnf.forwarding == 0 &&
2640             ifp->idev->cnf.rtr_solicits > 0 &&
2641             (dev->flags&IFF_LOOPBACK) == 0 &&
2642             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2643                 struct in6_addr all_routers;
2644
2645                 ipv6_addr_all_routers(&all_routers);
2646
2647                 /*
2648                  *      If a host as already performed a random delay
2649                  *      [...] as part of DAD [...] there is no need
2650                  *      to delay again before sending the first RS
2651                  */
2652                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2653
2654                 spin_lock_bh(&ifp->lock);
2655                 ifp->probes = 1;
2656                 ifp->idev->if_flags |= IF_RS_SENT;
2657                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2658                 spin_unlock_bh(&ifp->lock);
2659         }
2660 }
2661
2662 static void addrconf_dad_run(struct inet6_dev *idev) {
2663         struct inet6_ifaddr *ifp;
2664
2665         read_lock_bh(&idev->lock);
2666         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2667                 spin_lock_bh(&ifp->lock);
2668                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2669                         spin_unlock_bh(&ifp->lock);
2670                         continue;
2671                 }
2672                 spin_unlock_bh(&ifp->lock);
2673                 addrconf_dad_kick(ifp);
2674         }
2675         read_unlock_bh(&idev->lock);
2676 }
2677
2678 #ifdef CONFIG_PROC_FS
2679 struct if6_iter_state {
2680         int bucket;
2681 };
2682
2683 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2684 {
2685         struct inet6_ifaddr *ifa = NULL;
2686         struct if6_iter_state *state = seq->private;
2687
2688         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2689                 ifa = inet6_addr_lst[state->bucket];
2690                 if (ifa)
2691                         break;
2692         }
2693         return ifa;
2694 }
2695
2696 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2697 {
2698         struct if6_iter_state *state = seq->private;
2699
2700         ifa = ifa->lst_next;
2701 try_again:
2702         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2703                 ifa = inet6_addr_lst[state->bucket];
2704                 goto try_again;
2705         }
2706         return ifa;
2707 }
2708
2709 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2710 {
2711         struct inet6_ifaddr *ifa = if6_get_first(seq);
2712
2713         if (ifa)
2714                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2715                         --pos;
2716         return pos ? NULL : ifa;
2717 }
2718
2719 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2720 {
2721         read_lock_bh(&addrconf_hash_lock);
2722         return if6_get_idx(seq, *pos);
2723 }
2724
2725 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2726 {
2727         struct inet6_ifaddr *ifa;
2728
2729         ifa = if6_get_next(seq, v);
2730         ++*pos;
2731         return ifa;
2732 }
2733
2734 static void if6_seq_stop(struct seq_file *seq, void *v)
2735 {
2736         read_unlock_bh(&addrconf_hash_lock);
2737 }
2738
2739 static int if6_seq_show(struct seq_file *seq, void *v)
2740 {
2741         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2742         seq_printf(seq,
2743                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2744                    NIP6(ifp->addr),
2745                    ifp->idev->dev->ifindex,
2746                    ifp->prefix_len,
2747                    ifp->scope,
2748                    ifp->flags,
2749                    ifp->idev->dev->name);
2750         return 0;
2751 }
2752
2753 static struct seq_operations if6_seq_ops = {
2754         .start  = if6_seq_start,
2755         .next   = if6_seq_next,
2756         .show   = if6_seq_show,
2757         .stop   = if6_seq_stop,
2758 };
2759
2760 static int if6_seq_open(struct inode *inode, struct file *file)
2761 {
2762         struct seq_file *seq;
2763         int rc = -ENOMEM;
2764         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2765
2766         if (!s)
2767                 goto out;
2768
2769         rc = seq_open(file, &if6_seq_ops);
2770         if (rc)
2771                 goto out_kfree;
2772
2773         seq = file->private_data;
2774         seq->private = s;
2775 out:
2776         return rc;
2777 out_kfree:
2778         kfree(s);
2779         goto out;
2780 }
2781
2782 static const struct file_operations if6_fops = {
2783         .owner          = THIS_MODULE,
2784         .open           = if6_seq_open,
2785         .read           = seq_read,
2786         .llseek         = seq_lseek,
2787         .release        = seq_release_private,
2788 };
2789
2790 int __init if6_proc_init(void)
2791 {
2792         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2793                 return -ENOMEM;
2794         return 0;
2795 }
2796
2797 void if6_proc_exit(void)
2798 {
2799         proc_net_remove("if_inet6");
2800 }
2801 #endif  /* CONFIG_PROC_FS */
2802
2803 #ifdef CONFIG_IPV6_MIP6
2804 /* Check if address is a home address configured on any interface. */
2805 int ipv6_chk_home_addr(struct in6_addr *addr)
2806 {
2807         int ret = 0;
2808         struct inet6_ifaddr * ifp;
2809         u8 hash = ipv6_addr_hash(addr);
2810         read_lock_bh(&addrconf_hash_lock);
2811         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2812                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2813                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2814                         ret = 1;
2815                         break;
2816                 }
2817         }
2818         read_unlock_bh(&addrconf_hash_lock);
2819         return ret;
2820 }
2821 #endif
2822
2823 /*
2824  *      Periodic address status verification
2825  */
2826
2827 static void addrconf_verify(unsigned long foo)
2828 {
2829         struct inet6_ifaddr *ifp;
2830         unsigned long now, next;
2831         int i;
2832
2833         spin_lock_bh(&addrconf_verify_lock);
2834         now = jiffies;
2835         next = now + ADDR_CHECK_FREQUENCY;
2836
2837         del_timer(&addr_chk_timer);
2838
2839         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2840
2841 restart:
2842                 read_lock(&addrconf_hash_lock);
2843                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2844                         unsigned long age;
2845 #ifdef CONFIG_IPV6_PRIVACY
2846                         unsigned long regen_advance;
2847 #endif
2848
2849                         if (ifp->flags & IFA_F_PERMANENT)
2850                                 continue;
2851
2852                         spin_lock(&ifp->lock);
2853                         age = (now - ifp->tstamp) / HZ;
2854
2855 #ifdef CONFIG_IPV6_PRIVACY
2856                         regen_advance = ifp->idev->cnf.regen_max_retry *
2857                                         ifp->idev->cnf.dad_transmits *
2858                                         ifp->idev->nd_parms->retrans_time / HZ;
2859 #endif
2860
2861                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2862                             age >= ifp->valid_lft) {
2863                                 spin_unlock(&ifp->lock);
2864                                 in6_ifa_hold(ifp);
2865                                 read_unlock(&addrconf_hash_lock);
2866                                 ipv6_del_addr(ifp);
2867                                 goto restart;
2868                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2869                                 spin_unlock(&ifp->lock);
2870                                 continue;
2871                         } else if (age >= ifp->prefered_lft) {
2872                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2873                                 int deprecate = 0;
2874
2875                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2876                                         deprecate = 1;
2877                                         ifp->flags |= IFA_F_DEPRECATED;
2878                                 }
2879
2880                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2881                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2882
2883                                 spin_unlock(&ifp->lock);
2884
2885                                 if (deprecate) {
2886                                         in6_ifa_hold(ifp);
2887                                         read_unlock(&addrconf_hash_lock);
2888
2889                                         ipv6_ifa_notify(0, ifp);
2890                                         in6_ifa_put(ifp);
2891                                         goto restart;
2892                                 }
2893 #ifdef CONFIG_IPV6_PRIVACY
2894                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2895                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2896                                 if (age >= ifp->prefered_lft - regen_advance) {
2897                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2898                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2899                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2900                                         if (!ifp->regen_count && ifpub) {
2901                                                 ifp->regen_count++;
2902                                                 in6_ifa_hold(ifp);
2903                                                 in6_ifa_hold(ifpub);
2904                                                 spin_unlock(&ifp->lock);
2905                                                 read_unlock(&addrconf_hash_lock);
2906                                                 spin_lock(&ifpub->lock);
2907                                                 ifpub->regen_count = 0;
2908                                                 spin_unlock(&ifpub->lock);
2909                                                 ipv6_create_tempaddr(ifpub, ifp);
2910                                                 in6_ifa_put(ifpub);
2911                                                 in6_ifa_put(ifp);
2912                                                 goto restart;
2913                                         }
2914                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2915                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2916                                 spin_unlock(&ifp->lock);
2917 #endif
2918                         } else {
2919                                 /* ifp->prefered_lft <= ifp->valid_lft */
2920                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2921                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2922                                 spin_unlock(&ifp->lock);
2923                         }
2924                 }
2925                 read_unlock(&addrconf_hash_lock);
2926         }
2927
2928         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2929         add_timer(&addr_chk_timer);
2930         spin_unlock_bh(&addrconf_verify_lock);
2931 }
2932
2933 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2934 {
2935         struct in6_addr *pfx = NULL;
2936
2937         if (addr)
2938                 pfx = nla_data(addr);
2939
2940         if (local) {
2941                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2942                         pfx = NULL;
2943                 else
2944                         pfx = nla_data(local);
2945         }
2946
2947         return pfx;
2948 }
2949
2950 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2951         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2952         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2953         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2954 };
2955
2956 static int
2957 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2958 {
2959         struct ifaddrmsg *ifm;
2960         struct nlattr *tb[IFA_MAX+1];
2961         struct in6_addr *pfx;
2962         int err;
2963
2964         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2965         if (err < 0)
2966                 return err;
2967
2968         ifm = nlmsg_data(nlh);
2969         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2970         if (pfx == NULL)
2971                 return -EINVAL;
2972
2973         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2974 }
2975
2976 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2977                              u32 prefered_lft, u32 valid_lft)
2978 {
2979         u32 flags = RTF_EXPIRES;
2980
2981         if (!valid_lft || (prefered_lft > valid_lft))
2982                 return -EINVAL;
2983
2984         if (valid_lft == INFINITY_LIFE_TIME) {
2985                 ifa_flags |= IFA_F_PERMANENT;
2986                 flags = 0;
2987         } else if (valid_lft >= 0x7FFFFFFF/HZ)
2988                 valid_lft = 0x7FFFFFFF/HZ;
2989
2990         if (prefered_lft == 0)
2991                 ifa_flags |= IFA_F_DEPRECATED;
2992         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2993                  (prefered_lft != INFINITY_LIFE_TIME))
2994                 prefered_lft = 0x7FFFFFFF/HZ;
2995
2996         spin_lock_bh(&ifp->lock);
2997         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
2998         ifp->tstamp = jiffies;
2999         ifp->valid_lft = valid_lft;
3000         ifp->prefered_lft = prefered_lft;
3001
3002         spin_unlock_bh(&ifp->lock);
3003         if (!(ifp->flags&IFA_F_TENTATIVE))
3004                 ipv6_ifa_notify(0, ifp);
3005
3006         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3007                               jiffies_to_clock_t(valid_lft * HZ), flags);
3008         addrconf_verify(0);
3009
3010         return 0;
3011 }
3012
3013 static int
3014 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3015 {
3016         struct ifaddrmsg *ifm;
3017         struct nlattr *tb[IFA_MAX+1];
3018         struct in6_addr *pfx;
3019         struct inet6_ifaddr *ifa;
3020         struct net_device *dev;
3021         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3022         u8 ifa_flags;
3023         int err;
3024
3025         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3026         if (err < 0)
3027                 return err;
3028
3029         ifm = nlmsg_data(nlh);
3030         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3031         if (pfx == NULL)
3032                 return -EINVAL;
3033
3034         if (tb[IFA_CACHEINFO]) {
3035                 struct ifa_cacheinfo *ci;
3036
3037                 ci = nla_data(tb[IFA_CACHEINFO]);
3038                 valid_lft = ci->ifa_valid;
3039                 preferred_lft = ci->ifa_prefered;
3040         } else {
3041                 preferred_lft = INFINITY_LIFE_TIME;
3042                 valid_lft = INFINITY_LIFE_TIME;
3043         }
3044
3045         dev =  __dev_get_by_index(ifm->ifa_index);
3046         if (dev == NULL)
3047                 return -ENODEV;
3048
3049         /* We ignore other flags so far. */
3050         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3051
3052         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3053         if (ifa == NULL) {
3054                 /*
3055                  * It would be best to check for !NLM_F_CREATE here but
3056                  * userspace alreay relies on not having to provide this.
3057                  */
3058                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3059                                       ifa_flags, preferred_lft, valid_lft);
3060         }
3061
3062         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3063             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3064                 err = -EEXIST;
3065         else
3066                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3067
3068         in6_ifa_put(ifa);
3069
3070         return err;
3071 }
3072
3073 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3074                           u8 scope, int ifindex)
3075 {
3076         struct ifaddrmsg *ifm;
3077
3078         ifm = nlmsg_data(nlh);
3079         ifm->ifa_family = AF_INET6;
3080         ifm->ifa_prefixlen = prefixlen;
3081         ifm->ifa_flags = flags;
3082         ifm->ifa_scope = scope;
3083         ifm->ifa_index = ifindex;
3084 }
3085
3086 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3087                          unsigned long tstamp, u32 preferred, u32 valid)
3088 {
3089         struct ifa_cacheinfo ci;
3090
3091         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3092                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3093         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3094                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3095         ci.ifa_prefered = preferred;
3096         ci.ifa_valid = valid;
3097
3098         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3099 }
3100
3101 static inline int rt_scope(int ifa_scope)
3102 {
3103         if (ifa_scope & IFA_HOST)
3104                 return RT_SCOPE_HOST;
3105         else if (ifa_scope & IFA_LINK)
3106                 return RT_SCOPE_LINK;
3107         else if (ifa_scope & IFA_SITE)
3108                 return RT_SCOPE_SITE;
3109         else
3110                 return RT_SCOPE_UNIVERSE;
3111 }
3112
3113 static inline int inet6_ifaddr_msgsize(void)
3114 {
3115         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3116                + nla_total_size(16) /* IFA_ADDRESS */
3117                + nla_total_size(sizeof(struct ifa_cacheinfo));
3118 }
3119
3120 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3121                              u32 pid, u32 seq, int event, unsigned int flags)
3122 {
3123         struct nlmsghdr  *nlh;
3124         u32 preferred, valid;
3125
3126         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3127         if (nlh == NULL)
3128                 return -EMSGSIZE;
3129
3130         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3131                       ifa->idev->dev->ifindex);
3132
3133         if (!(ifa->flags&IFA_F_PERMANENT)) {
3134                 preferred = ifa->prefered_lft;
3135                 valid = ifa->valid_lft;
3136                 if (preferred != INFINITY_LIFE_TIME) {
3137                         long tval = (jiffies - ifa->tstamp)/HZ;
3138                         preferred -= tval;
3139                         if (valid != INFINITY_LIFE_TIME)
3140                                 valid -= tval;
3141                 }
3142         } else {
3143                 preferred = INFINITY_LIFE_TIME;
3144                 valid = INFINITY_LIFE_TIME;
3145         }
3146
3147         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3148             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3149                 nlmsg_cancel(skb, nlh);
3150                 return -EMSGSIZE;
3151         }
3152
3153         return nlmsg_end(skb, nlh);
3154 }
3155
3156 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3157                                 u32 pid, u32 seq, int event, u16 flags)
3158 {
3159         struct nlmsghdr  *nlh;
3160         u8 scope = RT_SCOPE_UNIVERSE;
3161         int ifindex = ifmca->idev->dev->ifindex;
3162
3163         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3164                 scope = RT_SCOPE_SITE;
3165
3166         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3167         if (nlh == NULL)
3168                 return -EMSGSIZE;
3169
3170         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3171         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3172             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3173                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3174                 nlmsg_cancel(skb, nlh);
3175                 return -EMSGSIZE;
3176         }
3177
3178         return nlmsg_end(skb, nlh);
3179 }
3180
3181 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3182                                 u32 pid, u32 seq, int event, unsigned int flags)
3183 {
3184         struct nlmsghdr  *nlh;
3185         u8 scope = RT_SCOPE_UNIVERSE;
3186         int ifindex = ifaca->aca_idev->dev->ifindex;
3187
3188         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3189                 scope = RT_SCOPE_SITE;
3190
3191         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3192         if (nlh == NULL)
3193                 return -EMSGSIZE;
3194
3195         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3196         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3197             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3198                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3199                 nlmsg_cancel(skb, nlh);
3200                 return -EMSGSIZE;
3201         }
3202
3203         return nlmsg_end(skb, nlh);
3204 }
3205
3206 enum addr_type_t
3207 {
3208         UNICAST_ADDR,
3209         MULTICAST_ADDR,
3210         ANYCAST_ADDR,
3211 };
3212
3213 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3214                            enum addr_type_t type)
3215 {
3216         int idx, ip_idx;
3217         int s_idx, s_ip_idx;
3218         int err = 1;
3219         struct net_device *dev;
3220         struct inet6_dev *idev = NULL;
3221         struct inet6_ifaddr *ifa;
3222         struct ifmcaddr6 *ifmca;
3223         struct ifacaddr6 *ifaca;
3224
3225         s_idx = cb->args[0];
3226         s_ip_idx = ip_idx = cb->args[1];
3227         read_lock(&dev_base_lock);
3228
3229         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3230                 if (idx < s_idx)
3231                         continue;
3232                 if (idx > s_idx)
3233                         s_ip_idx = 0;
3234                 ip_idx = 0;
3235                 if ((idev = in6_dev_get(dev)) == NULL)
3236                         continue;
3237                 read_lock_bh(&idev->lock);
3238                 switch (type) {
3239                 case UNICAST_ADDR:
3240                         /* unicast address incl. temp addr */
3241                         for (ifa = idev->addr_list; ifa;
3242                              ifa = ifa->if_next, ip_idx++) {
3243                                 if (ip_idx < s_ip_idx)
3244                                         continue;
3245                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3246                                     NETLINK_CB(cb->skb).pid,
3247                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3248                                     NLM_F_MULTI)) <= 0)
3249                                         goto done;
3250                         }
3251                         break;
3252                 case MULTICAST_ADDR:
3253                         /* multicast address */
3254                         for (ifmca = idev->mc_list; ifmca;
3255                              ifmca = ifmca->next, ip_idx++) {
3256                                 if (ip_idx < s_ip_idx)
3257                                         continue;
3258                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3259                                     NETLINK_CB(cb->skb).pid,
3260                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3261                                     NLM_F_MULTI)) <= 0)
3262                                         goto done;
3263                         }
3264                         break;
3265                 case ANYCAST_ADDR:
3266                         /* anycast address */
3267                         for (ifaca = idev->ac_list; ifaca;
3268                              ifaca = ifaca->aca_next, ip_idx++) {
3269                                 if (ip_idx < s_ip_idx)
3270                                         continue;
3271                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3272                                     NETLINK_CB(cb->skb).pid,
3273                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3274                                     NLM_F_MULTI)) <= 0)
3275                                         goto done;
3276                         }
3277                         break;
3278                 default:
3279                         break;
3280                 }
3281                 read_unlock_bh(&idev->lock);
3282                 in6_dev_put(idev);
3283         }
3284 done:
3285         if (err <= 0) {
3286                 read_unlock_bh(&idev->lock);
3287                 in6_dev_put(idev);
3288         }
3289         read_unlock(&dev_base_lock);
3290         cb->args[0] = idx;
3291         cb->args[1] = ip_idx;
3292         return skb->len;
3293 }
3294
3295 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3296 {
3297         enum addr_type_t type = UNICAST_ADDR;
3298         return inet6_dump_addr(skb, cb, type);
3299 }
3300
3301 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3302 {
3303         enum addr_type_t type = MULTICAST_ADDR;
3304         return inet6_dump_addr(skb, cb, type);
3305 }
3306
3307
3308 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3309 {
3310         enum addr_type_t type = ANYCAST_ADDR;
3311         return inet6_dump_addr(skb, cb, type);
3312 }
3313
3314 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3315                              void *arg)
3316 {
3317         struct ifaddrmsg *ifm;
3318         struct nlattr *tb[IFA_MAX+1];
3319         struct in6_addr *addr = NULL;
3320         struct net_device *dev = NULL;
3321         struct inet6_ifaddr *ifa;
3322         struct sk_buff *skb;
3323         int err;
3324
3325         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3326         if (err < 0)
3327                 goto errout;
3328
3329         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3330         if (addr == NULL) {
3331                 err = -EINVAL;
3332                 goto errout;
3333         }
3334
3335         ifm = nlmsg_data(nlh);
3336         if (ifm->ifa_index)
3337                 dev = __dev_get_by_index(ifm->ifa_index);
3338
3339         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3340                 err = -EADDRNOTAVAIL;
3341                 goto errout;
3342         }
3343
3344         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3345                 err = -ENOBUFS;
3346                 goto errout_ifa;
3347         }
3348
3349         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3350                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3351         if (err < 0) {
3352                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3353                 WARN_ON(err == -EMSGSIZE);
3354                 kfree_skb(skb);
3355                 goto errout_ifa;
3356         }
3357         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3358 errout_ifa:
3359         in6_ifa_put(ifa);
3360 errout:
3361         return err;
3362 }
3363
3364 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3365 {
3366         struct sk_buff *skb;
3367         int err = -ENOBUFS;
3368
3369         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3370         if (skb == NULL)
3371                 goto errout;
3372
3373         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3374         if (err < 0) {
3375                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3376                 WARN_ON(err == -EMSGSIZE);
3377                 kfree_skb(skb);
3378                 goto errout;
3379         }
3380         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3381 errout:
3382         if (err < 0)
3383                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3384 }
3385
3386 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3387                                 __s32 *array, int bytes)
3388 {
3389         BUG_ON(bytes < (DEVCONF_MAX * 4));
3390
3391         memset(array, 0, bytes);
3392         array[DEVCONF_FORWARDING] = cnf->forwarding;
3393         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3394         array[DEVCONF_MTU6] = cnf->mtu6;
3395         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3396         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3397         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3398         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3399         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3400         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3401         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3402         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3403 #ifdef CONFIG_IPV6_PRIVACY
3404         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3405         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3406         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3407         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3408         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3409 #endif
3410         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3411         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3412         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3413 #ifdef CONFIG_IPV6_ROUTER_PREF
3414         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3415         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3416 #ifdef CONFIG_IPV6_ROUTE_INFO
3417         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3418 #endif
3419 #endif
3420         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3421         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3423         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3424 #endif
3425 }
3426
3427 static inline size_t inet6_if_nlmsg_size(void)
3428 {
3429         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3430                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3431                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3432                + nla_total_size(4) /* IFLA_MTU */
3433                + nla_total_size(4) /* IFLA_LINK */
3434                + nla_total_size( /* IFLA_PROTINFO */
3435                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3436                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3437                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3438                  );
3439 }
3440
3441 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3442                              u32 pid, u32 seq, int event, unsigned int flags)
3443 {
3444         struct net_device *dev = idev->dev;
3445         struct nlattr *conf;
3446         struct ifinfomsg *hdr;
3447         struct nlmsghdr *nlh;
3448         void *protoinfo;
3449         struct ifla_cacheinfo ci;
3450
3451         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3452         if (nlh == NULL)
3453                 return -EMSGSIZE;
3454
3455         hdr = nlmsg_data(nlh);
3456         hdr->ifi_family = AF_INET6;
3457         hdr->__ifi_pad = 0;
3458         hdr->ifi_type = dev->type;
3459         hdr->ifi_index = dev->ifindex;
3460         hdr->ifi_flags = dev_get_flags(dev);
3461         hdr->ifi_change = 0;
3462
3463         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3464
3465         if (dev->addr_len)
3466                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3467
3468         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3469         if (dev->ifindex != dev->iflink)
3470                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3471
3472         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3473         if (protoinfo == NULL)
3474                 goto nla_put_failure;
3475
3476         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3477
3478         ci.max_reasm_len = IPV6_MAXPLEN;
3479         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3480                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3481         ci.reachable_time = idev->nd_parms->reachable_time;
3482         ci.retrans_time = idev->nd_parms->retrans_time;
3483         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3484
3485         conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3486         if (conf == NULL)
3487                 goto nla_put_failure;
3488         ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
3489
3490         /* XXX - Statistics/MC not implemented */
3491
3492         nla_nest_end(skb, protoinfo);
3493         return nlmsg_end(skb, nlh);
3494
3495 nla_put_failure:
3496         nlmsg_cancel(skb, nlh);
3497         return -EMSGSIZE;
3498 }
3499
3500 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3501 {
3502         int idx, err;
3503         int s_idx = cb->args[0];
3504         struct net_device *dev;
3505         struct inet6_dev *idev;
3506
3507         read_lock(&dev_base_lock);
3508         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3509                 if (idx < s_idx)
3510                         continue;
3511                 if ((idev = in6_dev_get(dev)) == NULL)
3512                         continue;
3513                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3514                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3515                 in6_dev_put(idev);
3516                 if (err <= 0)
3517                         break;
3518         }
3519         read_unlock(&dev_base_lock);
3520         cb->args[0] = idx;
3521
3522         return skb->len;
3523 }
3524
3525 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3526 {
3527         struct sk_buff *skb;
3528         int err = -ENOBUFS;
3529
3530         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3531         if (skb == NULL)
3532                 goto errout;
3533
3534         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3535         if (err < 0) {
3536                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3537                 WARN_ON(err == -EMSGSIZE);
3538                 kfree_skb(skb);
3539                 goto errout;
3540         }
3541         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3542 errout:
3543         if (err < 0)
3544                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3545 }
3546
3547 static inline size_t inet6_prefix_nlmsg_size(void)
3548 {
3549         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3550                + nla_total_size(sizeof(struct in6_addr))
3551                + nla_total_size(sizeof(struct prefix_cacheinfo));
3552 }
3553
3554 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3555                              struct prefix_info *pinfo, u32 pid, u32 seq,
3556                              int event, unsigned int flags)
3557 {
3558         struct prefixmsg *pmsg;
3559         struct nlmsghdr *nlh;
3560         struct prefix_cacheinfo ci;
3561
3562         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3563         if (nlh == NULL)
3564                 return -EMSGSIZE;
3565
3566         pmsg = nlmsg_data(nlh);
3567         pmsg->prefix_family = AF_INET6;
3568         pmsg->prefix_pad1 = 0;
3569         pmsg->prefix_pad2 = 0;
3570         pmsg->prefix_ifindex = idev->dev->ifindex;
3571         pmsg->prefix_len = pinfo->prefix_len;
3572         pmsg->prefix_type = pinfo->type;
3573         pmsg->prefix_pad3 = 0;
3574         pmsg->prefix_flags = 0;
3575         if (pinfo->onlink)
3576                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3577         if (pinfo->autoconf)
3578                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3579
3580         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3581
3582         ci.preferred_time = ntohl(pinfo->prefered);
3583         ci.valid_time = ntohl(pinfo->valid);
3584         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3585
3586         return nlmsg_end(skb, nlh);
3587
3588 nla_put_failure:
3589         nlmsg_cancel(skb, nlh);
3590         return -EMSGSIZE;
3591 }
3592
3593 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3594                          struct prefix_info *pinfo)
3595 {
3596         struct sk_buff *skb;
3597         int err = -ENOBUFS;
3598
3599         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3600         if (skb == NULL)
3601                 goto errout;
3602
3603         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3604         if (err < 0) {
3605                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3606                 WARN_ON(err == -EMSGSIZE);
3607                 kfree_skb(skb);
3608                 goto errout;
3609         }
3610         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3611 errout:
3612         if (err < 0)
3613                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3614 }
3615
3616 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3617         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3618         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3619         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3620         [RTM_GETADDR - RTM_BASE] = { .doit      = inet6_rtm_getaddr,
3621                                      .dumpit    = inet6_dump_ifaddr, },
3622         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3623         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3624         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3625         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3626         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3627                                       .dumpit   = inet6_dump_fib, },
3628 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3629         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = fib6_rules_dump,   },
3630 #endif
3631 };
3632
3633 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3634 {
3635         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3636
3637         switch (event) {
3638         case RTM_NEWADDR:
3639                 /*
3640                  * If the address was optimistic
3641                  * we inserted the route at the start of
3642                  * our DAD process, so we don't need
3643                  * to do it again
3644                  */
3645                 if (!(ifp->rt->rt6i_node))
3646                         ip6_ins_rt(ifp->rt);
3647                 if (ifp->idev->cnf.forwarding)
3648                         addrconf_join_anycast(ifp);
3649                 break;
3650         case RTM_DELADDR:
3651                 if (ifp->idev->cnf.forwarding)
3652                         addrconf_leave_anycast(ifp);
3653                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3654                 dst_hold(&ifp->rt->u.dst);
3655                 if (ip6_del_rt(ifp->rt))
3656                         dst_free(&ifp->rt->u.dst);
3657                 break;
3658         }
3659 }
3660
3661 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3662 {
3663         rcu_read_lock_bh();
3664         if (likely(ifp->idev->dead == 0))
3665                 __ipv6_ifa_notify(event, ifp);
3666         rcu_read_unlock_bh();
3667 }
3668
3669 #ifdef CONFIG_SYSCTL
3670
3671 static
3672 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3673                            void __user *buffer, size_t *lenp, loff_t *ppos)
3674 {
3675         int *valp = ctl->data;
3676         int val = *valp;
3677         int ret;
3678
3679         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3680
3681         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3682                 if (valp != &ipv6_devconf.forwarding) {
3683                         if ((!*valp) ^ (!val)) {
3684                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3685                                 if (idev == NULL)
3686                                         return ret;
3687                                 dev_forward_change(idev);
3688                         }
3689                 } else {
3690                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3691                         addrconf_forward_change();
3692                 }
3693                 if (*valp)
3694                         rt6_purge_dflt_routers();
3695         }
3696
3697         return ret;
3698 }
3699
3700 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3701                                             int __user *name, int nlen,
3702                                             void __user *oldval,
3703                                             size_t __user *oldlenp,
3704                                             void __user *newval, size_t newlen)
3705 {
3706         int *valp = table->data;
3707         int new;
3708
3709         if (!newval || !newlen)
3710                 return 0;
3711         if (newlen != sizeof(int))
3712                 return -EINVAL;
3713         if (get_user(new, (int __user *)newval))
3714                 return -EFAULT;
3715         if (new == *valp)
3716                 return 0;
3717         if (oldval && oldlenp) {
3718                 size_t len;
3719                 if (get_user(len, oldlenp))
3720                         return -EFAULT;
3721                 if (len) {
3722                         if (len > table->maxlen)
3723                                 len = table->maxlen;
3724                         if (copy_to_user(oldval, valp, len))
3725                                 return -EFAULT;
3726                         if (put_user(len, oldlenp))
3727                                 return -EFAULT;
3728                 }
3729         }
3730
3731         if (valp != &ipv6_devconf_dflt.forwarding) {
3732                 if (valp != &ipv6_devconf.forwarding) {
3733                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3734                         int changed;
3735                         if (unlikely(idev == NULL))
3736                                 return -ENODEV;
3737                         changed = (!*valp) ^ (!new);
3738                         *valp = new;
3739                         if (changed)
3740                                 dev_forward_change(idev);
3741                 } else {
3742                         *valp = new;
3743                         addrconf_forward_change();
3744                 }
3745
3746                 if (*valp)
3747                         rt6_purge_dflt_routers();
3748         } else
3749                 *valp = new;
3750
3751         return 1;
3752 }
3753
3754 static struct addrconf_sysctl_table
3755 {
3756         struct ctl_table_header *sysctl_header;
3757         ctl_table addrconf_vars[__NET_IPV6_MAX];
3758         ctl_table addrconf_dev[2];
3759         ctl_table addrconf_conf_dir[2];
3760         ctl_table addrconf_proto_dir[2];
3761         ctl_table addrconf_root_dir[2];
3762 } addrconf_sysctl __read_mostly = {
3763         .sysctl_header = NULL,
3764         .addrconf_vars = {
3765                 {
3766                         .ctl_name       =       NET_IPV6_FORWARDING,
3767                         .procname       =       "forwarding",
3768                         .data           =       &ipv6_devconf.forwarding,
3769                         .maxlen         =       sizeof(int),
3770                         .mode           =       0644,
3771                         .proc_handler   =       &addrconf_sysctl_forward,
3772                         .strategy       =       &addrconf_sysctl_forward_strategy,
3773                 },
3774                 {
3775                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3776                         .procname       =       "hop_limit",
3777                         .data           =       &ipv6_devconf.hop_limit,
3778                         .maxlen         =       sizeof(int),
3779                         .mode           =       0644,
3780                         .proc_handler   =       proc_dointvec,
3781                 },
3782                 {
3783                         .ctl_name       =       NET_IPV6_MTU,
3784                         .procname       =       "mtu",
3785                         .data           =       &ipv6_devconf.mtu6,
3786                         .maxlen         =       sizeof(int),
3787                         .mode           =       0644,
3788                         .proc_handler   =       &proc_dointvec,
3789                 },
3790                 {
3791                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3792                         .procname       =       "accept_ra",
3793                         .data           =       &ipv6_devconf.accept_ra,
3794                         .maxlen         =       sizeof(int),
3795                         .mode           =       0644,
3796                         .proc_handler   =       &proc_dointvec,
3797                 },
3798                 {
3799                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3800                         .procname       =       "accept_redirects",
3801                         .data           =       &ipv6_devconf.accept_redirects,
3802                         .maxlen         =       sizeof(int),
3803                         .mode           =       0644,
3804                         .proc_handler   =       &proc_dointvec,
3805                 },
3806                 {
3807                         .ctl_name       =       NET_IPV6_AUTOCONF,
3808                         .procname       =       "autoconf",
3809                         .data           =       &ipv6_devconf.autoconf,
3810                         .maxlen         =       sizeof(int),
3811                         .mode           =       0644,
3812                         .proc_handler   =       &proc_dointvec,
3813                 },
3814                 {
3815                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3816                         .procname       =       "dad_transmits",
3817                         .data           =       &ipv6_devconf.dad_transmits,
3818                         .maxlen         =       sizeof(int),
3819                         .mode           =       0644,
3820                         .proc_handler   =       &proc_dointvec,
3821                 },
3822                 {
3823                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3824                         .procname       =       "router_solicitations",
3825                         .data           =       &ipv6_devconf.rtr_solicits,
3826                         .maxlen         =       sizeof(int),
3827                         .mode           =       0644,
3828                         .proc_handler   =       &proc_dointvec,
3829                 },
3830                 {
3831                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3832                         .procname       =       "router_solicitation_interval",
3833                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3834                         .maxlen         =       sizeof(int),
3835                         .mode           =       0644,
3836                         .proc_handler   =       &proc_dointvec_jiffies,
3837                         .strategy       =       &sysctl_jiffies,
3838                 },
3839                 {
3840                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3841                         .procname       =       "router_solicitation_delay",
3842                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3843                         .maxlen         =       sizeof(int),
3844                         .mode           =       0644,
3845                         .proc_handler   =       &proc_dointvec_jiffies,
3846                         .strategy       =       &sysctl_jiffies,
3847                 },
3848                 {
3849                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3850                         .procname       =       "force_mld_version",
3851                         .data           =       &ipv6_devconf.force_mld_version,
3852                         .maxlen         =       sizeof(int),
3853                         .mode           =       0644,
3854                         .proc_handler   =       &proc_dointvec,
3855                 },
3856 #ifdef CONFIG_IPV6_PRIVACY
3857                 {
3858                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3859                         .procname       =       "use_tempaddr",
3860                         .data           =       &ipv6_devconf.use_tempaddr,
3861                         .maxlen         =       sizeof(int),
3862                         .mode           =       0644,
3863                         .proc_handler   =       &proc_dointvec,
3864                 },
3865                 {
3866                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3867                         .procname       =       "temp_valid_lft",
3868                         .data           =       &ipv6_devconf.temp_valid_lft,
3869                         .maxlen         =       sizeof(int),
3870                         .mode           =       0644,
3871                         .proc_handler   =       &proc_dointvec,
3872                 },
3873                 {
3874                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3875                         .procname       =       "temp_prefered_lft",
3876                         .data           =       &ipv6_devconf.temp_prefered_lft,
3877                         .maxlen         =       sizeof(int),
3878                         .mode           =       0644,
3879                         .proc_handler   =       &proc_dointvec,
3880                 },
3881                 {
3882                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3883                         .procname       =       "regen_max_retry",
3884                         .data           =       &ipv6_devconf.regen_max_retry,
3885                         .maxlen         =       sizeof(int),
3886                         .mode           =       0644,
3887                         .proc_handler   =       &proc_dointvec,
3888                 },
3889                 {
3890                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3891                         .procname       =       "max_desync_factor",
3892                         .data           =       &ipv6_devconf.max_desync_factor,
3893                         .maxlen         =       sizeof(int),
3894                         .mode           =       0644,
3895                         .proc_handler   =       &proc_dointvec,
3896                 },
3897 #endif
3898                 {
3899                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3900                         .procname       =       "max_addresses",
3901                         .data           =       &ipv6_devconf.max_addresses,
3902                         .maxlen         =       sizeof(int),
3903                         .mode           =       0644,
3904                         .proc_handler   =       &proc_dointvec,
3905                 },
3906                 {
3907                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3908                         .procname       =       "accept_ra_defrtr",
3909                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3910                         .maxlen         =       sizeof(int),
3911                         .mode           =       0644,
3912                         .proc_handler   =       &proc_dointvec,
3913                 },
3914                 {
3915                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3916                         .procname       =       "accept_ra_pinfo",
3917                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3918                         .maxlen         =       sizeof(int),
3919                         .mode           =       0644,
3920                         .proc_handler   =       &proc_dointvec,
3921                 },
3922 #ifdef CONFIG_IPV6_ROUTER_PREF
3923                 {
3924                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3925                         .procname       =       "accept_ra_rtr_pref",
3926                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3927                         .maxlen         =       sizeof(int),
3928                         .mode           =       0644,
3929                         .proc_handler   =       &proc_dointvec,
3930                 },
3931                 {
3932                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3933                         .procname       =       "router_probe_interval",
3934                         .data           =       &ipv6_devconf.rtr_probe_interval,
3935                         .maxlen         =       sizeof(int),
3936                         .mode           =       0644,
3937                         .proc_handler   =       &proc_dointvec_jiffies,
3938                         .strategy       =       &sysctl_jiffies,
3939                 },
3940 #ifdef CONFIG_IPV6_ROUTE_INFO
3941                 {
3942                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3943                         .procname       =       "accept_ra_rt_info_max_plen",
3944                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3945                         .maxlen         =       sizeof(int),
3946                         .mode           =       0644,
3947                         .proc_handler   =       &proc_dointvec,
3948                 },
3949 #endif
3950 #endif
3951                 {
3952                         .ctl_name       =       NET_IPV6_PROXY_NDP,
3953                         .procname       =       "proxy_ndp",
3954                         .data           =       &ipv6_devconf.proxy_ndp,
3955                         .maxlen         =       sizeof(int),
3956                         .mode           =       0644,
3957                         .proc_handler   =       &proc_dointvec,
3958                 },
3959                 {
3960                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
3961                         .procname       =       "accept_source_route",
3962                         .data           =       &ipv6_devconf.accept_source_route,
3963                         .maxlen         =       sizeof(int),
3964                         .mode           =       0644,
3965                         .proc_handler   =       &proc_dointvec,
3966                 },
3967 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3968                 {
3969                         .ctl_name       =       CTL_UNNUMBERED,
3970                         .procname       =       "optimistic_dad",
3971                         .data           =       &ipv6_devconf.optimistic_dad,
3972                         .maxlen         =       sizeof(int),
3973                         .mode           =       0644,
3974                         .proc_handler   =       &proc_dointvec,
3975
3976                 },
3977 #endif
3978                 {
3979                         .ctl_name       =       0,      /* sentinel */
3980                 }
3981         },
3982         .addrconf_dev = {
3983                 {
3984                         .ctl_name       =       NET_PROTO_CONF_ALL,
3985                         .procname       =       "all",
3986                         .mode           =       0555,
3987                         .child          =       addrconf_sysctl.addrconf_vars,
3988                 },
3989                 {
3990                         .ctl_name       =       0,      /* sentinel */
3991                 }
3992         },
3993         .addrconf_conf_dir = {
3994                 {
3995                         .ctl_name       =       NET_IPV6_CONF,
3996                         .procname       =       "conf",
3997                         .mode           =       0555,
3998                         .child          =       addrconf_sysctl.addrconf_dev,
3999                 },
4000                 {
4001                         .ctl_name       =       0,      /* sentinel */
4002                 }
4003         },
4004         .addrconf_proto_dir = {
4005                 {
4006                         .ctl_name       =       NET_IPV6,
4007                         .procname       =       "ipv6",
4008                         .mode           =       0555,
4009                         .child          =       addrconf_sysctl.addrconf_conf_dir,
4010                 },
4011                 {
4012                         .ctl_name       =       0,      /* sentinel */
4013                 }
4014         },
4015         .addrconf_root_dir = {
4016                 {
4017                         .ctl_name       =       CTL_NET,
4018                         .procname       =       "net",
4019                         .mode           =       0555,
4020                         .child          =       addrconf_sysctl.addrconf_proto_dir,
4021                 },
4022                 {
4023                         .ctl_name       =       0,      /* sentinel */
4024                 }
4025         },
4026 };
4027
4028 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4029 {
4030         int i;
4031         struct net_device *dev = idev ? idev->dev : NULL;
4032         struct addrconf_sysctl_table *t;
4033         char *dev_name = NULL;
4034
4035         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4036         if (t == NULL)
4037                 return;
4038         for (i=0; t->addrconf_vars[i].data; i++) {
4039                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4040                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4041         }
4042         if (dev) {
4043                 dev_name = dev->name;
4044                 t->addrconf_dev[0].ctl_name = dev->ifindex;
4045         } else {
4046                 dev_name = "default";
4047                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4048         }
4049
4050         /*
4051          * Make a copy of dev_name, because '.procname' is regarded as const
4052          * by sysctl and we wouldn't want anyone to change it under our feet
4053          * (see SIOCSIFNAME).
4054          */
4055         dev_name = kstrdup(dev_name, GFP_KERNEL);
4056         if (!dev_name)
4057             goto free;
4058
4059         t->addrconf_dev[0].procname = dev_name;
4060
4061         t->addrconf_dev[0].child = t->addrconf_vars;
4062         t->addrconf_conf_dir[0].child = t->addrconf_dev;
4063         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4064         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4065
4066         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4067         if (t->sysctl_header == NULL)
4068                 goto free_procname;
4069         else
4070                 p->sysctl = t;
4071         return;
4072
4073         /* error path */
4074  free_procname:
4075         kfree(dev_name);
4076  free:
4077         kfree(t);
4078
4079         return;
4080 }
4081
4082 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4083 {
4084         if (p->sysctl) {
4085                 struct addrconf_sysctl_table *t = p->sysctl;
4086                 p->sysctl = NULL;
4087                 unregister_sysctl_table(t->sysctl_header);
4088                 kfree(t->addrconf_dev[0].procname);
4089                 kfree(t);
4090         }
4091 }
4092
4093
4094 #endif
4095
4096 /*
4097  *      Device notifier
4098  */
4099
4100 int register_inet6addr_notifier(struct notifier_block *nb)
4101 {
4102         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4103 }
4104
4105 EXPORT_SYMBOL(register_inet6addr_notifier);
4106
4107 int unregister_inet6addr_notifier(struct notifier_block *nb)
4108 {
4109         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4110 }
4111
4112 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4113
4114 /*
4115  *      Init / cleanup code
4116  */
4117
4118 int __init addrconf_init(void)
4119 {
4120         int err = 0;
4121
4122         /* The addrconf netdev notifier requires that loopback_dev
4123          * has it's ipv6 private information allocated and setup
4124          * before it can bring up and give link-local addresses
4125          * to other devices which are up.
4126          *
4127          * Unfortunately, loopback_dev is not necessarily the first
4128          * entry in the global dev_base list of net devices.  In fact,
4129          * it is likely to be the very last entry on that list.
4130          * So this causes the notifier registry below to try and
4131          * give link-local addresses to all devices besides loopback_dev
4132          * first, then loopback_dev, which cases all the non-loopback_dev
4133          * devices to fail to get a link-local address.
4134          *
4135          * So, as a temporary fix, allocate the ipv6 structure for
4136          * loopback_dev first by hand.
4137          * Longer term, all of the dependencies ipv6 has upon the loopback
4138          * device and it being up should be removed.
4139          */
4140         rtnl_lock();
4141         if (!ipv6_add_dev(&loopback_dev))
4142                 err = -ENOMEM;
4143         rtnl_unlock();
4144         if (err)
4145                 return err;
4146
4147         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4148
4149         register_netdevice_notifier(&ipv6_dev_notf);
4150
4151         addrconf_verify(0);
4152         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4153 #ifdef CONFIG_SYSCTL
4154         addrconf_sysctl.sysctl_header =
4155                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4156         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4157 #endif
4158
4159         return 0;
4160 }
4161
4162 void __exit addrconf_cleanup(void)
4163 {
4164         struct net_device *dev;
4165         struct inet6_dev *idev;
4166         struct inet6_ifaddr *ifa;
4167         int i;
4168
4169         unregister_netdevice_notifier(&ipv6_dev_notf);
4170
4171         rtnetlink_links[PF_INET6] = NULL;
4172 #ifdef CONFIG_SYSCTL
4173         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4174         addrconf_sysctl_unregister(&ipv6_devconf);
4175 #endif
4176
4177         rtnl_lock();
4178
4179         /*
4180          *      clean dev list.
4181          */
4182
4183         for (dev=dev_base; dev; dev=dev->next) {
4184                 if ((idev = __in6_dev_get(dev)) == NULL)
4185                         continue;
4186                 addrconf_ifdown(dev, 1);
4187         }
4188         addrconf_ifdown(&loopback_dev, 2);
4189
4190         /*
4191          *      Check hash table.
4192          */
4193
4194         write_lock_bh(&addrconf_hash_lock);
4195         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4196                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4197                         struct inet6_ifaddr *bifa;
4198
4199                         bifa = ifa;
4200                         ifa = ifa->lst_next;
4201                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4202                         /* Do not free it; something is wrong.
4203                            Now we can investigate it with debugger.
4204                          */
4205                 }
4206         }
4207         write_unlock_bh(&addrconf_hash_lock);
4208
4209         del_timer(&addr_chk_timer);
4210
4211         rtnl_unlock();
4212
4213 #ifdef CONFIG_PROC_FS
4214         proc_net_remove("if_inet6");
4215 #endif
4216 }