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 #include <asm/unaligned.h>
  85
  86 #include <linux/proc_fs.h>
  87 #include <linux/seq_file.h>
  88
  89 /* Set to 3 to get tracing... */
  90 #define ACONF_DEBUG 2
  91
  92 #if ACONF_DEBUG >= 3
  93 #define ADBG(x) printk x
  94 #else
  95 #define ADBG(x)
  96 #endif
  97
  98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 100
 101 #ifdef CONFIG_SYSCTL
 102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 104 #endif
 105
 106 #ifdef CONFIG_IPV6_PRIVACY
 107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 109 static void ipv6_regen_rndid(unsigned long data);
 110
 111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 112 #endif
 113
 114 static int ipv6_count_addresses(struct inet6_dev *idev);
 115
 116 /*
 117  *      Configured unicast address hash table
 118  */
 119 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 120 static DEFINE_RWLOCK(addrconf_hash_lock);
 121
 122 static void addrconf_verify(unsigned long);
 123
 124 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 125 static DEFINE_SPINLOCK(addrconf_verify_lock);
 126
 127 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 129
 130 static int addrconf_ifdown(struct net_device *dev, int how);
 131
 132 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 133 static void addrconf_dad_timer(unsigned long data);
 134 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 135 static void addrconf_dad_run(struct inet6_dev *idev);
 136 static void addrconf_rs_timer(unsigned long data);
 137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 139
 140 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 141                                 struct prefix_info *pinfo);
 142 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 143
 144 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 145
 146 struct ipv6_devconf ipv6_devconf __read_mostly = {
 147         .forwarding             = 0,
 148         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 149         .mtu6                   = IPV6_MIN_MTU,
 150         .accept_ra              = 1,
 151         .accept_redirects       = 1,
 152         .autoconf               = 1,
 153         .force_mld_version      = 0,
 154         .dad_transmits          = 1,
 155         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 156         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 157         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 158 #ifdef CONFIG_IPV6_PRIVACY
 159         .use_tempaddr           = 0,
 160         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 161         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 162         .regen_max_retry        = REGEN_MAX_RETRY,
 163         .max_desync_factor      = MAX_DESYNC_FACTOR,
 164 #endif
 165         .max_addresses          = IPV6_MAX_ADDRESSES,
 166         .accept_ra_defrtr       = 1,
 167         .accept_ra_pinfo        = 1,
 168 #ifdef CONFIG_IPV6_ROUTER_PREF
 169         .accept_ra_rtr_pref     = 1,
 170         .rtr_probe_interval     = 60 * HZ,
 171 #ifdef CONFIG_IPV6_ROUTE_INFO
 172         .accept_ra_rt_info_max_plen = 0,
 173 #endif
 174 #endif
 175         .proxy_ndp              = 0,
 176         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 177 };
 178
 179 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 180         .forwarding             = 0,
 181         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 182         .mtu6                   = IPV6_MIN_MTU,
 183         .accept_ra              = 1,
 184         .accept_redirects       = 1,
 185         .autoconf               = 1,
 186         .dad_transmits          = 1,
 187         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 188         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 189         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 190 #ifdef CONFIG_IPV6_PRIVACY
 191         .use_tempaddr           = 0,
 192         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 193         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 194         .regen_max_retry        = REGEN_MAX_RETRY,
 195         .max_desync_factor      = MAX_DESYNC_FACTOR,
 196 #endif
 197         .max_addresses          = IPV6_MAX_ADDRESSES,
 198         .accept_ra_defrtr       = 1,
 199         .accept_ra_pinfo        = 1,
 200 #ifdef CONFIG_IPV6_ROUTER_PREF
 201         .accept_ra_rtr_pref     = 1,
 202         .rtr_probe_interval     = 60 * HZ,
 203 #ifdef CONFIG_IPV6_ROUTE_INFO
 204         .accept_ra_rt_info_max_plen = 0,
 205 #endif
 206 #endif
 207         .proxy_ndp              = 0,
 208         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 209 };
 210
 211 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 212 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 214
 215 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 216 {
 217         if (del_timer(&ifp->timer))
 218                 __in6_ifa_put(ifp);
 219 }
 220
 221 enum addrconf_timer_t
 222 {
 223         AC_NONE,
 224         AC_DAD,
 225         AC_RS,
 226 };
 227
 228 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 229                                enum addrconf_timer_t what,
 230                                unsigned long when)
 231 {
 232         if (!del_timer(&ifp->timer))
 233                 in6_ifa_hold(ifp);
 234
 235         switch (what) {
 236         case AC_DAD:
 237                 ifp->timer.function = addrconf_dad_timer;
 238                 break;
 239         case AC_RS:
 240                 ifp->timer.function = addrconf_rs_timer;
 241                 break;
 242         default:;
 243         }
 244         ifp->timer.expires = jiffies + when;
 245         add_timer(&ifp->timer);
 246 }
 247
 248 static int snmp6_alloc_dev(struct inet6_dev *idev)
 249 {
 250         int err = -ENOMEM;
 251
 252         if (!idev || !idev->dev)
 253                 return -EINVAL;
 254
 255         if (snmp_mib_init((void **)idev->stats.ipv6,
 256                           sizeof(struct ipstats_mib),
 257                           __alignof__(struct ipstats_mib)) < 0)
 258                 goto err_ip;
 259         if (snmp_mib_init((void **)idev->stats.icmpv6,
 260                           sizeof(struct icmpv6_mib),
 261                           __alignof__(struct icmpv6_mib)) < 0)
 262                 goto err_icmp;
 263
 264         return 0;
 265
 266 err_icmp:
 267         snmp_mib_free((void **)idev->stats.ipv6);
 268 err_ip:
 269         return err;
 270 }
 271
 272 static int snmp6_free_dev(struct inet6_dev *idev)
 273 {
 274         snmp_mib_free((void **)idev->stats.icmpv6);
 275         snmp_mib_free((void **)idev->stats.ipv6);
 276         return 0;
 277 }
 278
 279 /* Nobody refers to this device, we may destroy it. */
 280
 281 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 282 {
 283         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 284         kfree(idev);
 285 }
 286
 287 void in6_dev_finish_destroy(struct inet6_dev *idev)
 288 {
 289         struct net_device *dev = idev->dev;
 290         BUG_TRAP(idev->addr_list==NULL);
 291         BUG_TRAP(idev->mc_list==NULL);
 292 #ifdef NET_REFCNT_DEBUG
 293         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 294 #endif
 295         dev_put(dev);
 296         if (!idev->dead) {
 297                 printk("Freeing alive inet6 device %p\n", idev);
 298                 return;
 299         }
 300         snmp6_free_dev(idev);
 301         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 302 }
 303
 304 EXPORT_SYMBOL(in6_dev_finish_destroy);
 305
 306 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 307 {
 308         struct inet6_dev *ndev;
 309         struct in6_addr maddr;
 310
 311         ASSERT_RTNL();
 312
 313         if (dev->mtu < IPV6_MIN_MTU)
 314                 return NULL;
 315
 316         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 317
 318         if (ndev == NULL)
 319                 return NULL;
 320
 321         rwlock_init(&ndev->lock);
 322         ndev->dev = dev;
 323         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 324         ndev->cnf.mtu6 = dev->mtu;
 325         ndev->cnf.sysctl = NULL;
 326         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 327         if (ndev->nd_parms == NULL) {
 328                 kfree(ndev);
 329                 return NULL;
 330         }
 331         /* We refer to the device */
 332         dev_hold(dev);
 333
 334         if (snmp6_alloc_dev(ndev) < 0) {
 335                 ADBG((KERN_WARNING
 336                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 337                         __FUNCTION__, dev->name));
 338                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 339                 ndev->dead = 1;
 340                 in6_dev_finish_destroy(ndev);
 341                 return NULL;
 342         }
 343
 344         if (snmp6_register_dev(ndev) < 0) {
 345                 ADBG((KERN_WARNING
 346                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 347                         __FUNCTION__, dev->name));
 348                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 349                 ndev->dead = 1;
 350                 in6_dev_finish_destroy(ndev);
 351                 return NULL;
 352         }
 353
 354         /* One reference from device.  We must do this before
 355          * we invoke __ipv6_regen_rndid().
 356          */
 357         in6_dev_hold(ndev);
 358
 359 #ifdef CONFIG_IPV6_PRIVACY
 360         init_timer(&ndev->regen_timer);
 361         ndev->regen_timer.function = ipv6_regen_rndid;
 362         ndev->regen_timer.data = (unsigned long) ndev;
 363         if ((dev->flags&IFF_LOOPBACK) ||
 364             dev->type == ARPHRD_TUNNEL ||
 365 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 366             dev->type == ARPHRD_SIT ||
 367 #endif
 368             dev->type == ARPHRD_NONE) {
 369                 printk(KERN_INFO
 370                        "%s: Disabled Privacy Extensions\n",
 371                        dev->name);
 372                 ndev->cnf.use_tempaddr = -1;
 373         } else {
 374                 in6_dev_hold(ndev);
 375                 ipv6_regen_rndid((unsigned long) ndev);
 376         }
 377 #endif
 378
 379         if (netif_running(dev) && netif_carrier_ok(dev))
 380                 ndev->if_flags |= IF_READY;
 381
 382         ipv6_mc_init_dev(ndev);
 383         ndev->tstamp = jiffies;
 384 #ifdef CONFIG_SYSCTL
 385         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 386                               NET_IPV6_NEIGH, "ipv6",
 387                               &ndisc_ifinfo_sysctl_change,
 388                               NULL);
 389         addrconf_sysctl_register(ndev, &ndev->cnf);
 390 #endif
 391         /* protected by rtnl_lock */
 392         rcu_assign_pointer(dev->ip6_ptr, ndev);
 393
 394         /* Join all-node multicast group */
 395         ipv6_addr_all_nodes(&maddr);
 396         ipv6_dev_mc_inc(dev, &maddr);
 397
 398         return ndev;
 399 }
 400
 401 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 402 {
 403         struct inet6_dev *idev;
 404
 405         ASSERT_RTNL();
 406
 407         if ((idev = __in6_dev_get(dev)) == NULL) {
 408                 if ((idev = ipv6_add_dev(dev)) == NULL)
 409                         return NULL;
 410         }
 411
 412         if (dev->flags&IFF_UP)
 413                 ipv6_mc_up(idev);
 414         return idev;
 415 }
 416
 417 #ifdef CONFIG_SYSCTL
 418 static void dev_forward_change(struct inet6_dev *idev)
 419 {
 420         struct net_device *dev;
 421         struct inet6_ifaddr *ifa;
 422         struct in6_addr addr;
 423
 424         if (!idev)
 425                 return;
 426         dev = idev->dev;
 427         if (dev && (dev->flags & IFF_MULTICAST)) {
 428                 ipv6_addr_all_routers(&addr);
 429
 430                 if (idev->cnf.forwarding)
 431                         ipv6_dev_mc_inc(dev, &addr);
 432                 else
 433                         ipv6_dev_mc_dec(dev, &addr);
 434         }
 435         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 436                 if (ifa->flags&IFA_F_TENTATIVE)
 437                         continue;
 438                 if (idev->cnf.forwarding)
 439                         addrconf_join_anycast(ifa);
 440                 else
 441                         addrconf_leave_anycast(ifa);
 442         }
 443 }
 444
 445
 446 static void addrconf_forward_change(void)
 447 {
 448         struct net_device *dev;
 449         struct inet6_dev *idev;
 450
 451         read_lock(&dev_base_lock);
 452         for (dev=dev_base; dev; dev=dev->next) {
 453                 rcu_read_lock();
 454                 idev = __in6_dev_get(dev);
 455                 if (idev) {
 456                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 457                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 458                         if (changed)
 459                                 dev_forward_change(idev);
 460                 }
 461                 rcu_read_unlock();
 462         }
 463         read_unlock(&dev_base_lock);
 464 }
 465 #endif
 466
 467 /* Nobody refers to this ifaddr, destroy it */
 468
 469 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 470 {
 471         BUG_TRAP(ifp->if_next==NULL);
 472         BUG_TRAP(ifp->lst_next==NULL);
 473 #ifdef NET_REFCNT_DEBUG
 474         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 475 #endif
 476
 477         in6_dev_put(ifp->idev);
 478
 479         if (del_timer(&ifp->timer))
 480                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 481
 482         if (!ifp->dead) {
 483                 printk("Freeing alive inet6 address %p\n", ifp);
 484                 return;
 485         }
 486         dst_release(&ifp->rt->u.dst);
 487
 488         kfree(ifp);
 489 }
 490
 491 static void
 492 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 493 {
 494         struct inet6_ifaddr *ifa, **ifap;
 495         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 496
 497         /*
 498          * Each device address list is sorted in order of scope -
 499          * global before linklocal.
 500          */
 501         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 502              ifap = &ifa->if_next) {
 503                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 504                         break;
 505         }
 506
 507         ifp->if_next = *ifap;
 508         *ifap = ifp;
 509 }
 510
 511 /* On success it returns ifp with increased reference count */
 512
 513 static struct inet6_ifaddr *
 514 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 515               int scope, u32 flags)
 516 {
 517         struct inet6_ifaddr *ifa = NULL;
 518         struct rt6_info *rt;
 519         int hash;
 520         int err = 0;
 521
 522         rcu_read_lock_bh();
 523         if (idev->dead) {
 524                 err = -ENODEV;                  /*XXX*/
 525                 goto out2;
 526         }
 527
 528         write_lock(&addrconf_hash_lock);
 529
 530         /* Ignore adding duplicate addresses on an interface */
 531         if (ipv6_chk_same_addr(addr, idev->dev)) {
 532                 ADBG(("ipv6_add_addr: already assigned\n"));
 533                 err = -EEXIST;
 534                 goto out;
 535         }
 536
 537         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 538
 539         if (ifa == NULL) {
 540                 ADBG(("ipv6_add_addr: malloc failed\n"));
 541                 err = -ENOBUFS;
 542                 goto out;
 543         }
 544
 545         rt = addrconf_dst_alloc(idev, addr, 0);
 546         if (IS_ERR(rt)) {
 547                 err = PTR_ERR(rt);
 548                 goto out;
 549         }
 550
 551         ipv6_addr_copy(&ifa->addr, addr);
 552
 553         spin_lock_init(&ifa->lock);
 554         init_timer(&ifa->timer);
 555         ifa->timer.data = (unsigned long) ifa;
 556         ifa->scope = scope;
 557         ifa->prefix_len = pfxlen;
 558         ifa->flags = flags | IFA_F_TENTATIVE;
 559         ifa->cstamp = ifa->tstamp = jiffies;
 560
 561         ifa->rt = rt;
 562
 563         /*
 564          * part one of RFC 4429, section 3.3
 565          * We should not configure an address as
 566          * optimistic if we do not yet know the link
 567          * layer address of our nexhop router
 568          */
 569
 570         if (rt->rt6i_nexthop == NULL)
 571                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 572
 573         ifa->idev = idev;
 574         in6_dev_hold(idev);
 575         /* For caller */
 576         in6_ifa_hold(ifa);
 577
 578         /* Add to big hash table */
 579         hash = ipv6_addr_hash(addr);
 580
 581         ifa->lst_next = inet6_addr_lst[hash];
 582         inet6_addr_lst[hash] = ifa;
 583         in6_ifa_hold(ifa);
 584         write_unlock(&addrconf_hash_lock);
 585
 586         write_lock(&idev->lock);
 587         /* Add to inet6_dev unicast addr list. */
 588         ipv6_link_dev_addr(idev, ifa);
 589
 590 #ifdef CONFIG_IPV6_PRIVACY
 591         if (ifa->flags&IFA_F_TEMPORARY) {
 592                 ifa->tmp_next = idev->tempaddr_list;
 593                 idev->tempaddr_list = ifa;
 594                 in6_ifa_hold(ifa);
 595         }
 596 #endif
 597
 598         in6_ifa_hold(ifa);
 599         write_unlock(&idev->lock);
 600 out2:
 601         rcu_read_unlock_bh();
 602
 603         if (likely(err == 0))
 604                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 605         else {
 606                 kfree(ifa);
 607                 ifa = ERR_PTR(err);
 608         }
 609
 610         return ifa;
 611 out:
 612         write_unlock(&addrconf_hash_lock);
 613         goto out2;
 614 }
 615
 616 /* This function wants to get referenced ifp and releases it before return */
 617
 618 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 619 {
 620         struct inet6_ifaddr *ifa, **ifap;
 621         struct inet6_dev *idev = ifp->idev;
 622         int hash;
 623         int deleted = 0, onlink = 0;
 624         unsigned long expires = jiffies;
 625
 626         hash = ipv6_addr_hash(&ifp->addr);
 627
 628         ifp->dead = 1;
 629
 630         write_lock_bh(&addrconf_hash_lock);
 631         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 632              ifap = &ifa->lst_next) {
 633                 if (ifa == ifp) {
 634                         *ifap = ifa->lst_next;
 635                         __in6_ifa_put(ifp);
 636                         ifa->lst_next = NULL;
 637                         break;
 638                 }
 639         }
 640         write_unlock_bh(&addrconf_hash_lock);
 641
 642         write_lock_bh(&idev->lock);
 643 #ifdef CONFIG_IPV6_PRIVACY
 644         if (ifp->flags&IFA_F_TEMPORARY) {
 645                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 646                      ifap = &ifa->tmp_next) {
 647                         if (ifa == ifp) {
 648                                 *ifap = ifa->tmp_next;
 649                                 if (ifp->ifpub) {
 650                                         in6_ifa_put(ifp->ifpub);
 651                                         ifp->ifpub = NULL;
 652                                 }
 653                                 __in6_ifa_put(ifp);
 654                                 ifa->tmp_next = NULL;
 655                                 break;
 656                         }
 657                 }
 658         }
 659 #endif
 660
 661         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 662                 if (ifa == ifp) {
 663                         *ifap = ifa->if_next;
 664                         __in6_ifa_put(ifp);
 665                         ifa->if_next = NULL;
 666                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 667                                 break;
 668                         deleted = 1;
 669                         continue;
 670                 } else if (ifp->flags & IFA_F_PERMANENT) {
 671                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 672                                               ifp->prefix_len)) {
 673                                 if (ifa->flags & IFA_F_PERMANENT) {
 674                                         onlink = 1;
 675                                         if (deleted)
 676                                                 break;
 677                                 } else {
 678                                         unsigned long lifetime;
 679
 680                                         if (!onlink)
 681                                                 onlink = -1;
 682
 683                                         spin_lock(&ifa->lock);
 684                                         lifetime = min_t(unsigned long,
 685                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 686                                         if (time_before(expires,
 687                                                         ifa->tstamp + lifetime * HZ))
 688                                                 expires = ifa->tstamp + lifetime * HZ;
 689                                         spin_unlock(&ifa->lock);
 690                                 }
 691                         }
 692                 }
 693                 ifap = &ifa->if_next;
 694         }
 695         write_unlock_bh(&idev->lock);
 696
 697         ipv6_ifa_notify(RTM_DELADDR, ifp);
 698
 699         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 700
 701         addrconf_del_timer(ifp);
 702
 703         /*
 704          * Purge or update corresponding prefix
 705          *
 706          * 1) we don't purge prefix here if address was not permanent.
 707          *    prefix is managed by its own lifetime.
 708          * 2) if there're no addresses, delete prefix.
 709          * 3) if there're still other permanent address(es),
 710          *    corresponding prefix is still permanent.
 711          * 4) otherwise, update prefix lifetime to the
 712          *    longest valid lifetime among the corresponding
 713          *    addresses on the device.
 714          *    Note: subsequent RA will update lifetime.
 715          *
 716          * --yoshfuji
 717          */
 718         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 719                 struct in6_addr prefix;
 720                 struct rt6_info *rt;
 721
 722                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 723                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 724
 725                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 726                         if (onlink == 0) {
 727                                 ip6_del_rt(rt);
 728                                 rt = NULL;
 729                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 730                                 rt->rt6i_expires = expires;
 731                                 rt->rt6i_flags |= RTF_EXPIRES;
 732                         }
 733                 }
 734                 dst_release(&rt->u.dst);
 735         }
 736
 737         in6_ifa_put(ifp);
 738 }
 739
 740 #ifdef CONFIG_IPV6_PRIVACY
 741 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 742 {
 743         struct inet6_dev *idev = ifp->idev;
 744         struct in6_addr addr, *tmpaddr;
 745         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 746         int tmp_plen;
 747         int ret = 0;
 748         int max_addresses;
 749         u32 addr_flags;
 750
 751         write_lock(&idev->lock);
 752         if (ift) {
 753                 spin_lock_bh(&ift->lock);
 754                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 755                 spin_unlock_bh(&ift->lock);
 756                 tmpaddr = &addr;
 757         } else {
 758                 tmpaddr = NULL;
 759         }
 760 retry:
 761         in6_dev_hold(idev);
 762         if (idev->cnf.use_tempaddr <= 0) {
 763                 write_unlock(&idev->lock);
 764                 printk(KERN_INFO
 765                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 766                 in6_dev_put(idev);
 767                 ret = -1;
 768                 goto out;
 769         }
 770         spin_lock_bh(&ifp->lock);
 771         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 772                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 773                 spin_unlock_bh(&ifp->lock);
 774                 write_unlock(&idev->lock);
 775                 printk(KERN_WARNING
 776                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 777                 in6_dev_put(idev);
 778                 ret = -1;
 779                 goto out;
 780         }
 781         in6_ifa_hold(ifp);
 782         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 783         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 784                 spin_unlock_bh(&ifp->lock);
 785                 write_unlock(&idev->lock);
 786                 printk(KERN_WARNING
 787                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 788                 in6_ifa_put(ifp);
 789                 in6_dev_put(idev);
 790                 ret = -1;
 791                 goto out;
 792         }
 793         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 794         tmp_valid_lft = min_t(__u32,
 795                               ifp->valid_lft,
 796                               idev->cnf.temp_valid_lft);
 797         tmp_prefered_lft = min_t(__u32,
 798                                  ifp->prefered_lft,
 799                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 800         tmp_plen = ifp->prefix_len;
 801         max_addresses = idev->cnf.max_addresses;
 802         tmp_cstamp = ifp->cstamp;
 803         tmp_tstamp = ifp->tstamp;
 804         spin_unlock_bh(&ifp->lock);
 805
 806         write_unlock(&idev->lock);
 807
 808         addr_flags = IFA_F_TEMPORARY;
 809         /* set in addrconf_prefix_rcv() */
 810         if (ifp->flags & IFA_F_OPTIMISTIC)
 811                 addr_flags |= IFA_F_OPTIMISTIC;
 812
 813         ift = !max_addresses ||
 814               ipv6_count_addresses(idev) < max_addresses ?
 815                 ipv6_add_addr(idev, &addr, tmp_plen,
 816                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 817                               addr_flags) : NULL;
 818         if (!ift || IS_ERR(ift)) {
 819                 in6_ifa_put(ifp);
 820                 in6_dev_put(idev);
 821                 printk(KERN_INFO
 822                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 823                 tmpaddr = &addr;
 824                 write_lock(&idev->lock);
 825                 goto retry;
 826         }
 827
 828         spin_lock_bh(&ift->lock);
 829         ift->ifpub = ifp;
 830         ift->valid_lft = tmp_valid_lft;
 831         ift->prefered_lft = tmp_prefered_lft;
 832         ift->cstamp = tmp_cstamp;
 833         ift->tstamp = tmp_tstamp;
 834         spin_unlock_bh(&ift->lock);
 835
 836         addrconf_dad_start(ift, 0);
 837         in6_ifa_put(ift);
 838         in6_dev_put(idev);
 839 out:
 840         return ret;
 841 }
 842 #endif
 843
 844 /*
 845  *      Choose an appropriate source address (RFC3484)
 846  */
 847 struct ipv6_saddr_score {
 848         int             addr_type;
 849         unsigned int    attrs;
 850         int             matchlen;
 851         int             scope;
 852         unsigned int    rule;
 853 };
 854
 855 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 856 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 857 #define IPV6_SADDR_SCORE_HOA            0x0008
 858 #define IPV6_SADDR_SCORE_OIF            0x0010
 859 #define IPV6_SADDR_SCORE_LABEL          0x0020
 860 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 861
 862 static inline int ipv6_saddr_preferred(int type)
 863 {
 864         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 865                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 866                 return 1;
 867         return 0;
 868 }
 869
 870 /* static matching label */
 871 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
 872 {
 873  /*
 874   *     prefix (longest match)  label
 875   *     -----------------------------
 876   *     ::1/128                 0
 877   *     ::/0                    1
 878   *     2002::/16               2
 879   *     ::/96                   3
 880   *     ::ffff:0:0/96           4
 881   *     fc00::/7                5
 882   *     2001::/32               6
 883   */
 884         if (type & IPV6_ADDR_LOOPBACK)
 885                 return 0;
 886         else if (type & IPV6_ADDR_COMPATv4)
 887                 return 3;
 888         else if (type & IPV6_ADDR_MAPPED)
 889                 return 4;
 890         else if (addr->s6_addr32[0] == htonl(0x20010000))
 891                 return 6;
 892         else if (addr->s6_addr16[0] == htons(0x2002))
 893                 return 2;
 894         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 895                 return 5;
 896         return 1;
 897 }
 898
 899 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 900                        struct in6_addr *daddr, struct in6_addr *saddr)
 901 {
 902         struct ipv6_saddr_score hiscore;
 903         struct inet6_ifaddr *ifa_result = NULL;
 904         int daddr_type = __ipv6_addr_type(daddr);
 905         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 906         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 907         struct net_device *dev;
 908
 909         memset(&hiscore, 0, sizeof(hiscore));
 910
 911         read_lock(&dev_base_lock);
 912         rcu_read_lock();
 913
 914         for (dev = dev_base; dev; dev=dev->next) {
 915                 struct inet6_dev *idev;
 916                 struct inet6_ifaddr *ifa;
 917
 918                 /* Rule 0: Candidate Source Address (section 4)
 919                  *  - multicast and link-local destination address,
 920                  *    the set of candidate source address MUST only
 921                  *    include addresses assigned to interfaces
 922                  *    belonging to the same link as the outgoing
 923                  *    interface.
 924                  * (- For site-local destination addresses, the
 925                  *    set of candidate source addresses MUST only
 926                  *    include addresses assigned to interfaces
 927                  *    belonging to the same site as the outgoing
 928                  *    interface.)
 929                  */
 930                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 931                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 932                     daddr_dev && dev != daddr_dev)
 933                         continue;
 934
 935                 idev = __in6_dev_get(dev);
 936                 if (!idev)
 937                         continue;
 938
 939                 read_lock_bh(&idev->lock);
 940                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 941                         struct ipv6_saddr_score score;
 942
 943                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 944
 945                         /* Rule 0:
 946                          * - Tentative Address (RFC2462 section 5.4)
 947                          *  - A tentative address is not considered
 948                          *    "assigned to an interface" in the traditional
 949                          *    sense, unless it is also flagged as optimistic.
 950                          * - Candidate Source Address (section 4)
 951                          *  - In any case, anycast addresses, multicast
 952                          *    addresses, and the unspecified address MUST
 953                          *    NOT be included in a candidate set.
 954                          */
 955                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 956                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 957                                 continue;
 958                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 959                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 960                                 LIMIT_NETDEBUG(KERN_DEBUG
 961                                                "ADDRCONF: unspecified / multicast address"
 962                                                "assigned as unicast address on %s",
 963                                                dev->name);
 964                                 continue;
 965                         }
 966
 967                         score.attrs = 0;
 968                         score.matchlen = 0;
 969                         score.scope = 0;
 970                         score.rule = 0;
 971
 972                         if (ifa_result == NULL) {
 973                                 /* record it if the first available entry */
 974                                 goto record_it;
 975                         }
 976
 977                         /* Rule 1: Prefer same address */
 978                         if (hiscore.rule < 1) {
 979                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 980                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 981                                 hiscore.rule++;
 982                         }
 983                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 984                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 985                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 986                                         score.rule = 1;
 987                                         goto record_it;
 988                                 }
 989                         } else {
 990                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 991                                         continue;
 992                         }
 993
 994                         /* Rule 2: Prefer appropriate scope */
 995                         if (hiscore.rule < 2) {
 996                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 997                                 hiscore.rule++;
 998                         }
 999                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1000                         if (hiscore.scope < score.scope) {
1001                                 if (hiscore.scope < daddr_scope) {
1002                                         score.rule = 2;
1003                                         goto record_it;
1004                                 } else
1005                                         continue;
1006                         } else if (score.scope < hiscore.scope) {
1007                                 if (score.scope < daddr_scope)
1008                                         break; /* addresses sorted by scope */
1009                                 else {
1010                                         score.rule = 2;
1011                                         goto record_it;
1012                                 }
1013                         }
1014
1015                         /* Rule 3: Avoid deprecated and optimistic addresses */
1016                         if (hiscore.rule < 3) {
1017                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1018                                    (((ifa_result->flags &
1019                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1020                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1021                                 hiscore.rule++;
1022                         }
1023                         if (ipv6_saddr_preferred(score.addr_type) ||
1024                            (((ifa_result->flags &
1025                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1026                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1027                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1028                                         score.rule = 3;
1029                                         goto record_it;
1030                                 }
1031                         } else {
1032                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1033                                         continue;
1034                         }
1035
1036                         /* Rule 4: Prefer home address */
1037 #ifdef CONFIG_IPV6_MIP6
1038                         if (hiscore.rule < 4) {
1039                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1040                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1041                                 hiscore.rule++;
1042                         }
1043                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1044                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1045                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1046                                         score.rule = 4;
1047                                         goto record_it;
1048                                 }
1049                         } else {
1050                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1051                                         continue;
1052                         }
1053 #else
1054                         if (hiscore.rule < 4)
1055                                 hiscore.rule++;
1056 #endif
1057
1058                         /* Rule 5: Prefer outgoing interface */
1059                         if (hiscore.rule < 5) {
1060                                 if (daddr_dev == NULL ||
1061                                     daddr_dev == ifa_result->idev->dev)
1062                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1063                                 hiscore.rule++;
1064                         }
1065                         if (daddr_dev == NULL ||
1066                             daddr_dev == ifa->idev->dev) {
1067                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1068                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1069                                         score.rule = 5;
1070                                         goto record_it;
1071                                 }
1072                         } else {
1073                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1074                                         continue;
1075                         }
1076
1077                         /* Rule 6: Prefer matching label */
1078                         if (hiscore.rule < 6) {
1079                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1080                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1081                                 hiscore.rule++;
1082                         }
1083                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1084                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1085                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1086                                         score.rule = 6;
1087                                         goto record_it;
1088                                 }
1089                         } else {
1090                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1091                                         continue;
1092                         }
1093
1094 #ifdef CONFIG_IPV6_PRIVACY
1095                         /* Rule 7: Prefer public address
1096                          * Note: prefer temprary address if use_tempaddr >= 2
1097                          */
1098                         if (hiscore.rule < 7) {
1099                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1100                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1101                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1102                                 hiscore.rule++;
1103                         }
1104                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1105                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1106                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1107                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1108                                         score.rule = 7;
1109                                         goto record_it;
1110                                 }
1111                         } else {
1112                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1113                                         continue;
1114                         }
1115 #else
1116                         if (hiscore.rule < 7)
1117                                 hiscore.rule++;
1118 #endif
1119                         /* Rule 8: Use longest matching prefix */
1120                         if (hiscore.rule < 8) {
1121                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1122                                 hiscore.rule++;
1123                         }
1124                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1125                         if (score.matchlen > hiscore.matchlen) {
1126                                 score.rule = 8;
1127                                 goto record_it;
1128                         }
1129 #if 0
1130                         else if (score.matchlen < hiscore.matchlen)
1131                                 continue;
1132 #endif
1133
1134                         /* Final Rule: choose first available one */
1135                         continue;
1136 record_it:
1137                         if (ifa_result)
1138                                 in6_ifa_put(ifa_result);
1139                         in6_ifa_hold(ifa);
1140                         ifa_result = ifa;
1141                         hiscore = score;
1142                 }
1143                 read_unlock_bh(&idev->lock);
1144         }
1145         rcu_read_unlock();
1146         read_unlock(&dev_base_lock);
1147
1148         if (!ifa_result)
1149                 return -EADDRNOTAVAIL;
1150
1151         ipv6_addr_copy(saddr, &ifa_result->addr);
1152         in6_ifa_put(ifa_result);
1153         return 0;
1154 }
1155
1156
1157 int ipv6_get_saddr(struct dst_entry *dst,
1158                    struct in6_addr *daddr, struct in6_addr *saddr)
1159 {
1160         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1161 }
1162
1163 EXPORT_SYMBOL(ipv6_get_saddr);
1164
1165 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1166                     unsigned char banned_flags)
1167 {
1168         struct inet6_dev *idev;
1169         int err = -EADDRNOTAVAIL;
1170
1171         rcu_read_lock();
1172         if ((idev = __in6_dev_get(dev)) != NULL) {
1173                 struct inet6_ifaddr *ifp;
1174
1175                 read_lock_bh(&idev->lock);
1176                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1177                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1178                                 ipv6_addr_copy(addr, &ifp->addr);
1179                                 err = 0;
1180                                 break;
1181                         }
1182                 }
1183                 read_unlock_bh(&idev->lock);
1184         }
1185         rcu_read_unlock();
1186         return err;
1187 }
1188
1189 static int ipv6_count_addresses(struct inet6_dev *idev)
1190 {
1191         int cnt = 0;
1192         struct inet6_ifaddr *ifp;
1193
1194         read_lock_bh(&idev->lock);
1195         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1196                 cnt++;
1197         read_unlock_bh(&idev->lock);
1198         return cnt;
1199 }
1200
1201 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1202 {
1203         struct inet6_ifaddr * ifp;
1204         u8 hash = ipv6_addr_hash(addr);
1205
1206         read_lock_bh(&addrconf_hash_lock);
1207         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1208                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1209                     !(ifp->flags&IFA_F_TENTATIVE)) {
1210                         if (dev == NULL || ifp->idev->dev == dev ||
1211                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1212                                 break;
1213                 }
1214         }
1215         read_unlock_bh(&addrconf_hash_lock);
1216         return ifp != NULL;
1217 }
1218
1219 EXPORT_SYMBOL(ipv6_chk_addr);
1220
1221 static
1222 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1223 {
1224         struct inet6_ifaddr * ifp;
1225         u8 hash = ipv6_addr_hash(addr);
1226
1227         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1228                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1229                         if (dev == NULL || ifp->idev->dev == dev)
1230                                 break;
1231                 }
1232         }
1233         return ifp != NULL;
1234 }
1235
1236 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1237 {
1238         struct inet6_ifaddr * ifp;
1239         u8 hash = ipv6_addr_hash(addr);
1240
1241         read_lock_bh(&addrconf_hash_lock);
1242         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1243                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1244                         if (dev == NULL || ifp->idev->dev == dev ||
1245                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1246                                 in6_ifa_hold(ifp);
1247                                 break;
1248                         }
1249                 }
1250         }
1251         read_unlock_bh(&addrconf_hash_lock);
1252
1253         return ifp;
1254 }
1255
1256 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1257 {
1258         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1259         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1260         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1261         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1262         int sk_ipv6only = ipv6_only_sock(sk);
1263         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1264         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1265         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1266
1267         if (!sk2_rcv_saddr && !sk_ipv6only)
1268                 return 1;
1269
1270         if (addr_type2 == IPV6_ADDR_ANY &&
1271             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1272                 return 1;
1273
1274         if (addr_type == IPV6_ADDR_ANY &&
1275             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1276                 return 1;
1277
1278         if (sk2_rcv_saddr6 &&
1279             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1280                 return 1;
1281
1282         if (addr_type == IPV6_ADDR_MAPPED &&
1283             !sk2_ipv6only &&
1284             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1285                 return 1;
1286
1287         return 0;
1288 }
1289
1290 /* Gets referenced address, destroys ifaddr */
1291
1292 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1293 {
1294         if (ifp->flags&IFA_F_PERMANENT) {
1295                 spin_lock_bh(&ifp->lock);
1296                 addrconf_del_timer(ifp);
1297                 ifp->flags |= IFA_F_TENTATIVE;
1298                 spin_unlock_bh(&ifp->lock);
1299                 in6_ifa_put(ifp);
1300 #ifdef CONFIG_IPV6_PRIVACY
1301         } else if (ifp->flags&IFA_F_TEMPORARY) {
1302                 struct inet6_ifaddr *ifpub;
1303                 spin_lock_bh(&ifp->lock);
1304                 ifpub = ifp->ifpub;
1305                 if (ifpub) {
1306                         in6_ifa_hold(ifpub);
1307                         spin_unlock_bh(&ifp->lock);
1308                         ipv6_create_tempaddr(ifpub, ifp);
1309                         in6_ifa_put(ifpub);
1310                 } else {
1311                         spin_unlock_bh(&ifp->lock);
1312                 }
1313                 ipv6_del_addr(ifp);
1314 #endif
1315         } else
1316                 ipv6_del_addr(ifp);
1317 }
1318
1319 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1320 {
1321         if (net_ratelimit())
1322                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1323         addrconf_dad_stop(ifp);
1324 }
1325
1326 /* Join to solicited addr multicast group. */
1327
1328 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1329 {
1330         struct in6_addr maddr;
1331
1332         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1333                 return;
1334
1335         addrconf_addr_solict_mult(addr, &maddr);
1336         ipv6_dev_mc_inc(dev, &maddr);
1337 }
1338
1339 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1340 {
1341         struct in6_addr maddr;
1342
1343         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1344                 return;
1345
1346         addrconf_addr_solict_mult(addr, &maddr);
1347         __ipv6_dev_mc_dec(idev, &maddr);
1348 }
1349
1350 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1351 {
1352         struct in6_addr addr;
1353         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1354         if (ipv6_addr_any(&addr))
1355                 return;
1356         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1357 }
1358
1359 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1360 {
1361         struct in6_addr addr;
1362         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1363         if (ipv6_addr_any(&addr))
1364                 return;
1365         __ipv6_dev_ac_dec(ifp->idev, &addr);
1366 }
1367
1368 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1369 {
1370         if (dev->addr_len != ETH_ALEN)
1371                 return -1;
1372         memcpy(eui, dev->dev_addr, 3);
1373         memcpy(eui + 5, dev->dev_addr + 3, 3);
1374
1375         /*
1376          * The zSeries OSA network cards can be shared among various
1377          * OS instances, but the OSA cards have only one MAC address.
1378          * This leads to duplicate address conflicts in conjunction
1379          * with IPv6 if more than one instance uses the same card.
1380          *
1381          * The driver for these cards can deliver a unique 16-bit
1382          * identifier for each instance sharing the same card.  It is
1383          * placed instead of 0xFFFE in the interface identifier.  The
1384          * "u" bit of the interface identifier is not inverted in this
1385          * case.  Hence the resulting interface identifier has local
1386          * scope according to RFC2373.
1387          */
1388         if (dev->dev_id) {
1389                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1390                 eui[4] = dev->dev_id & 0xFF;
1391         } else {
1392                 eui[3] = 0xFF;
1393                 eui[4] = 0xFE;
1394                 eui[0] ^= 2;
1395         }
1396         return 0;
1397 }
1398
1399 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1400 {
1401         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1402         if (dev->addr_len != ARCNET_ALEN)
1403                 return -1;
1404         memset(eui, 0, 7);
1405         eui[7] = *(u8*)dev->dev_addr;
1406         return 0;
1407 }
1408
1409 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1410 {
1411         if (dev->addr_len != INFINIBAND_ALEN)
1412                 return -1;
1413         memcpy(eui, dev->dev_addr + 12, 8);
1414         eui[0] |= 2;
1415         return 0;
1416 }
1417
1418 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1419 {
1420         switch (dev->type) {
1421         case ARPHRD_ETHER:
1422         case ARPHRD_FDDI:
1423         case ARPHRD_IEEE802_TR:
1424                 return addrconf_ifid_eui48(eui, dev);
1425         case ARPHRD_ARCNET:
1426                 return addrconf_ifid_arcnet(eui, dev);
1427         case ARPHRD_INFINIBAND:
1428                 return addrconf_ifid_infiniband(eui, dev);
1429         }
1430         return -1;
1431 }
1432
1433 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1434 {
1435         int err = -1;
1436         struct inet6_ifaddr *ifp;
1437
1438         read_lock_bh(&idev->lock);
1439         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1440                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1441                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1442                         err = 0;
1443                         break;
1444                 }
1445         }
1446         read_unlock_bh(&idev->lock);
1447         return err;
1448 }
1449
1450 #ifdef CONFIG_IPV6_PRIVACY
1451 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1452 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1453 {
1454 regen:
1455         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1456         idev->rndid[0] &= ~0x02;
1457
1458         /*
1459          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1460          * check if generated address is not inappropriate
1461          *
1462          *  - Reserved subnet anycast (RFC 2526)
1463          *      11111101 11....11 1xxxxxxx
1464          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1465          *      00-00-5E-FE-xx-xx-xx-xx
1466          *  - value 0
1467          *  - XXX: already assigned to an address on the device
1468          */
1469         if (idev->rndid[0] == 0xfd &&
1470             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1471             (idev->rndid[7]&0x80))
1472                 goto regen;
1473         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1474                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1475                         goto regen;
1476                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1477                         goto regen;
1478         }
1479
1480         return 0;
1481 }
1482
1483 static void ipv6_regen_rndid(unsigned long data)
1484 {
1485         struct inet6_dev *idev = (struct inet6_dev *) data;
1486         unsigned long expires;
1487
1488         rcu_read_lock_bh();
1489         write_lock_bh(&idev->lock);
1490
1491         if (idev->dead)
1492                 goto out;
1493
1494         if (__ipv6_regen_rndid(idev) < 0)
1495                 goto out;
1496
1497         expires = jiffies +
1498                 idev->cnf.temp_prefered_lft * HZ -
1499                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1500         if (time_before(expires, jiffies)) {
1501                 printk(KERN_WARNING
1502                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1503                         idev->dev->name);
1504                 goto out;
1505         }
1506
1507         if (!mod_timer(&idev->regen_timer, expires))
1508                 in6_dev_hold(idev);
1509
1510 out:
1511         write_unlock_bh(&idev->lock);
1512         rcu_read_unlock_bh();
1513         in6_dev_put(idev);
1514 }
1515
1516 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1517         int ret = 0;
1518
1519         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1520                 ret = __ipv6_regen_rndid(idev);
1521         return ret;
1522 }
1523 #endif
1524
1525 /*
1526  *      Add prefix route.
1527  */
1528
1529 static void
1530 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1531                       unsigned long expires, u32 flags)
1532 {
1533         struct fib6_config cfg = {
1534                 .fc_table = RT6_TABLE_PREFIX,
1535                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1536                 .fc_ifindex = dev->ifindex,
1537                 .fc_expires = expires,
1538                 .fc_dst_len = plen,
1539                 .fc_flags = RTF_UP | flags,
1540         };
1541
1542         ipv6_addr_copy(&cfg.fc_dst, pfx);
1543
1544         /* Prevent useless cloning on PtP SIT.
1545            This thing is done here expecting that the whole
1546            class of non-broadcast devices need not cloning.
1547          */
1548 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1549         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1550                 cfg.fc_flags |= RTF_NONEXTHOP;
1551 #endif
1552
1553         ip6_route_add(&cfg);
1554 }
1555
1556 /* Create "default" multicast route to the interface */
1557
1558 static void addrconf_add_mroute(struct net_device *dev)
1559 {
1560         struct fib6_config cfg = {
1561                 .fc_table = RT6_TABLE_LOCAL,
1562                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1563                 .fc_ifindex = dev->ifindex,
1564                 .fc_dst_len = 8,
1565                 .fc_flags = RTF_UP,
1566         };
1567
1568         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1569
1570         ip6_route_add(&cfg);
1571 }
1572
1573 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1574 static void sit_route_add(struct net_device *dev)
1575 {
1576         struct fib6_config cfg = {
1577                 .fc_table = RT6_TABLE_MAIN,
1578                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1579                 .fc_ifindex = dev->ifindex,
1580                 .fc_dst_len = 96,
1581                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1582         };
1583
1584         /* prefix length - 96 bits "::d.d.d.d" */
1585         ip6_route_add(&cfg);
1586 }
1587 #endif
1588
1589 static void addrconf_add_lroute(struct net_device *dev)
1590 {
1591         struct in6_addr addr;
1592
1593         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1594         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1595 }
1596
1597 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1598 {
1599         struct inet6_dev *idev;
1600
1601         ASSERT_RTNL();
1602
1603         if ((idev = ipv6_find_idev(dev)) == NULL)
1604                 return NULL;
1605
1606         /* Add default multicast route */
1607         addrconf_add_mroute(dev);
1608
1609         /* Add link local route */
1610         addrconf_add_lroute(dev);
1611         return idev;
1612 }
1613
1614 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1615 {
1616         struct prefix_info *pinfo;
1617         __u32 valid_lft;
1618         __u32 prefered_lft;
1619         int addr_type;
1620         unsigned long rt_expires;
1621         struct inet6_dev *in6_dev;
1622
1623         pinfo = (struct prefix_info *) opt;
1624
1625         if (len < sizeof(struct prefix_info)) {
1626                 ADBG(("addrconf: prefix option too short\n"));
1627                 return;
1628         }
1629
1630         /*
1631          *      Validation checks ([ADDRCONF], page 19)
1632          */
1633
1634         addr_type = ipv6_addr_type(&pinfo->prefix);
1635
1636         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1637                 return;
1638
1639         valid_lft = ntohl(pinfo->valid);
1640         prefered_lft = ntohl(pinfo->prefered);
1641
1642         if (prefered_lft > valid_lft) {
1643                 if (net_ratelimit())
1644                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1645                 return;
1646         }
1647
1648         in6_dev = in6_dev_get(dev);
1649
1650         if (in6_dev == NULL) {
1651                 if (net_ratelimit())
1652                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1653                 return;
1654         }
1655
1656         /*
1657          *      Two things going on here:
1658          *      1) Add routes for on-link prefixes
1659          *      2) Configure prefixes with the auto flag set
1660          */
1661
1662         /* Avoid arithmetic overflow. Really, we could
1663            save rt_expires in seconds, likely valid_lft,
1664            but it would require division in fib gc, that it
1665            not good.
1666          */
1667         if (valid_lft >= 0x7FFFFFFF/HZ)
1668                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1669         else
1670                 rt_expires = valid_lft * HZ;
1671
1672         /*
1673          * We convert this (in jiffies) to clock_t later.
1674          * Avoid arithmetic overflow there as well.
1675          * Overflow can happen only if HZ < USER_HZ.
1676          */
1677         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1678                 rt_expires = 0x7FFFFFFF / USER_HZ;
1679
1680         if (pinfo->onlink) {
1681                 struct rt6_info *rt;
1682                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1683
1684                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1685                         if (rt->rt6i_flags&RTF_EXPIRES) {
1686                                 if (valid_lft == 0) {
1687                                         ip6_del_rt(rt);
1688                                         rt = NULL;
1689                                 } else {
1690                                         rt->rt6i_expires = jiffies + rt_expires;
1691                                 }
1692                         }
1693                 } else if (valid_lft) {
1694                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1695                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1696                 }
1697                 if (rt)
1698                         dst_release(&rt->u.dst);
1699         }
1700
1701         /* Try to figure out our local address for this prefix */
1702
1703         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1704                 struct inet6_ifaddr * ifp;
1705                 struct in6_addr addr;
1706                 int create = 0, update_lft = 0;
1707
1708                 if (pinfo->prefix_len == 64) {
1709                         memcpy(&addr, &pinfo->prefix, 8);
1710                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1711                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1712                                 in6_dev_put(in6_dev);
1713                                 return;
1714                         }
1715                         goto ok;
1716                 }
1717                 if (net_ratelimit())
1718                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1719                                pinfo->prefix_len);
1720                 in6_dev_put(in6_dev);
1721                 return;
1722
1723 ok:
1724
1725                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1726
1727                 if (ifp == NULL && valid_lft) {
1728                         int max_addresses = in6_dev->cnf.max_addresses;
1729                         u32 addr_flags = 0;
1730
1731 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1732                         if (in6_dev->cnf.optimistic_dad &&
1733                             !ipv6_devconf.forwarding)
1734                                 addr_flags = IFA_F_OPTIMISTIC;
1735 #endif
1736
1737                         /* Do not allow to create too much of autoconfigured
1738                          * addresses; this would be too easy way to crash kernel.
1739                          */
1740                         if (!max_addresses ||
1741                             ipv6_count_addresses(in6_dev) < max_addresses)
1742                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1743                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1744                                                     addr_flags);
1745
1746                         if (!ifp || IS_ERR(ifp)) {
1747                                 in6_dev_put(in6_dev);
1748                                 return;
1749                         }
1750
1751                         update_lft = create = 1;
1752                         ifp->cstamp = jiffies;
1753                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1754                 }
1755
1756                 if (ifp) {
1757                         int flags;
1758                         unsigned long now;
1759 #ifdef CONFIG_IPV6_PRIVACY
1760                         struct inet6_ifaddr *ift;
1761 #endif
1762                         u32 stored_lft;
1763
1764                         /* update lifetime (RFC2462 5.5.3 e) */
1765                         spin_lock(&ifp->lock);
1766                         now = jiffies;
1767                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1768                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1769                         else
1770                                 stored_lft = 0;
1771                         if (!update_lft && stored_lft) {
1772                                 if (valid_lft > MIN_VALID_LIFETIME ||
1773                                     valid_lft > stored_lft)
1774                                         update_lft = 1;
1775                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1776                                         /* valid_lft <= stored_lft is always true */
1777                                         /* XXX: IPsec */
1778                                         update_lft = 0;
1779                                 } else {
1780                                         valid_lft = MIN_VALID_LIFETIME;
1781                                         if (valid_lft < prefered_lft)
1782                                                 prefered_lft = valid_lft;
1783                                         update_lft = 1;
1784                                 }
1785                         }
1786
1787                         if (update_lft) {
1788                                 ifp->valid_lft = valid_lft;
1789                                 ifp->prefered_lft = prefered_lft;
1790                                 ifp->tstamp = now;
1791                                 flags = ifp->flags;
1792                                 ifp->flags &= ~IFA_F_DEPRECATED;
1793                                 spin_unlock(&ifp->lock);
1794
1795                                 if (!(flags&IFA_F_TENTATIVE))
1796                                         ipv6_ifa_notify(0, ifp);
1797                         } else
1798                                 spin_unlock(&ifp->lock);
1799
1800 #ifdef CONFIG_IPV6_PRIVACY
1801                         read_lock_bh(&in6_dev->lock);
1802                         /* update all temporary addresses in the list */
1803                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1804                                 /*
1805                                  * When adjusting the lifetimes of an existing
1806                                  * temporary address, only lower the lifetimes.
1807                                  * Implementations must not increase the
1808                                  * lifetimes of an existing temporary address
1809                                  * when processing a Prefix Information Option.
1810                                  */
1811                                 spin_lock(&ift->lock);
1812                                 flags = ift->flags;
1813                                 if (ift->valid_lft > valid_lft &&
1814                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1815                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1816                                 if (ift->prefered_lft > prefered_lft &&
1817                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1818                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1819                                 spin_unlock(&ift->lock);
1820                                 if (!(flags&IFA_F_TENTATIVE))
1821                                         ipv6_ifa_notify(0, ift);
1822                         }
1823
1824                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1825                                 /*
1826                                  * When a new public address is created as described in [ADDRCONF],
1827                                  * also create a new temporary address.
1828                                  */
1829                                 read_unlock_bh(&in6_dev->lock);
1830                                 ipv6_create_tempaddr(ifp, NULL);
1831                         } else {
1832                                 read_unlock_bh(&in6_dev->lock);
1833                         }
1834 #endif
1835                         in6_ifa_put(ifp);
1836                         addrconf_verify(0);
1837                 }
1838         }
1839         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1840         in6_dev_put(in6_dev);
1841 }
1842
1843 /*
1844  *      Set destination address.
1845  *      Special case for SIT interfaces where we create a new "virtual"
1846  *      device.
1847  */
1848 int addrconf_set_dstaddr(void __user *arg)
1849 {
1850         struct in6_ifreq ireq;
1851         struct net_device *dev;
1852         int err = -EINVAL;
1853
1854         rtnl_lock();
1855
1856         err = -EFAULT;
1857         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1858                 goto err_exit;
1859
1860         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1861
1862         err = -ENODEV;
1863         if (dev == NULL)
1864                 goto err_exit;
1865
1866 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1867         if (dev->type == ARPHRD_SIT) {
1868                 struct ifreq ifr;
1869                 mm_segment_t    oldfs;
1870                 struct ip_tunnel_parm p;
1871
1872                 err = -EADDRNOTAVAIL;
1873                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1874                         goto err_exit;
1875
1876                 memset(&p, 0, sizeof(p));
1877                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1878                 p.iph.saddr = 0;
1879                 p.iph.version = 4;
1880                 p.iph.ihl = 5;
1881                 p.iph.protocol = IPPROTO_IPV6;
1882                 p.iph.ttl = 64;
1883                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1884
1885                 oldfs = get_fs(); set_fs(KERNEL_DS);
1886                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1887                 set_fs(oldfs);
1888
1889                 if (err == 0) {
1890                         err = -ENOBUFS;
1891                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1892                                 goto err_exit;
1893                         err = dev_open(dev);
1894                 }
1895         }
1896 #endif
1897
1898 err_exit:
1899         rtnl_unlock();
1900         return err;
1901 }
1902
1903 /*
1904  *      Manual configuration of address on an interface
1905  */
1906 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1907                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1908 {
1909         struct inet6_ifaddr *ifp;
1910         struct inet6_dev *idev;
1911         struct net_device *dev;
1912         int scope;
1913         u32 flags = RTF_EXPIRES;
1914
1915         ASSERT_RTNL();
1916
1917         /* check the lifetime */
1918         if (!valid_lft || prefered_lft > valid_lft)
1919                 return -EINVAL;
1920
1921         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1922                 return -ENODEV;
1923
1924         if ((idev = addrconf_add_dev(dev)) == NULL)
1925                 return -ENOBUFS;
1926
1927         scope = ipv6_addr_scope(pfx);
1928
1929         if (valid_lft == INFINITY_LIFE_TIME) {
1930                 ifa_flags |= IFA_F_PERMANENT;
1931                 flags = 0;
1932         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1933                 valid_lft = 0x7FFFFFFF/HZ;
1934
1935         if (prefered_lft == 0)
1936                 ifa_flags |= IFA_F_DEPRECATED;
1937         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1938                  (prefered_lft != INFINITY_LIFE_TIME))
1939                 prefered_lft = 0x7FFFFFFF/HZ;
1940
1941         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1942
1943         if (!IS_ERR(ifp)) {
1944                 spin_lock_bh(&ifp->lock);
1945                 ifp->valid_lft = valid_lft;
1946                 ifp->prefered_lft = prefered_lft;
1947                 ifp->tstamp = jiffies;
1948                 spin_unlock_bh(&ifp->lock);
1949
1950                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1951                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1952                 /*
1953                  * Note that section 3.1 of RFC 4429 indicates
1954                  * that the Optimistic flag should not be set for
1955                  * manually configured addresses
1956                  */
1957                 addrconf_dad_start(ifp, 0);
1958                 in6_ifa_put(ifp);
1959                 addrconf_verify(0);
1960                 return 0;
1961         }
1962
1963         return PTR_ERR(ifp);
1964 }
1965
1966 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1967 {
1968         struct inet6_ifaddr *ifp;
1969         struct inet6_dev *idev;
1970         struct net_device *dev;
1971
1972         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1973                 return -ENODEV;
1974
1975         if ((idev = __in6_dev_get(dev)) == NULL)
1976                 return -ENXIO;
1977
1978         read_lock_bh(&idev->lock);
1979         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1980                 if (ifp->prefix_len == plen &&
1981                     ipv6_addr_equal(pfx, &ifp->addr)) {
1982                         in6_ifa_hold(ifp);
1983                         read_unlock_bh(&idev->lock);
1984
1985                         ipv6_del_addr(ifp);
1986
1987                         /* If the last address is deleted administratively,
1988                            disable IPv6 on this interface.
1989                          */
1990                         if (idev->addr_list == NULL)
1991                                 addrconf_ifdown(idev->dev, 1);
1992                         return 0;
1993                 }
1994         }
1995         read_unlock_bh(&idev->lock);
1996         return -EADDRNOTAVAIL;
1997 }
1998
1999
2000 int addrconf_add_ifaddr(void __user *arg)
2001 {
2002         struct in6_ifreq ireq;
2003         int err;
2004
2005         if (!capable(CAP_NET_ADMIN))
2006                 return -EPERM;
2007
2008         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2009                 return -EFAULT;
2010
2011         rtnl_lock();
2012         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2013                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2014         rtnl_unlock();
2015         return err;
2016 }
2017
2018 int addrconf_del_ifaddr(void __user *arg)
2019 {
2020         struct in6_ifreq ireq;
2021         int err;
2022
2023         if (!capable(CAP_NET_ADMIN))
2024                 return -EPERM;
2025
2026         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2027                 return -EFAULT;
2028
2029         rtnl_lock();
2030         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2031         rtnl_unlock();
2032         return err;
2033 }
2034
2035 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2036 static void sit_add_v4_addrs(struct inet6_dev *idev)
2037 {
2038         struct inet6_ifaddr * ifp;
2039         struct in6_addr addr;
2040         struct net_device *dev;
2041         int scope;
2042
2043         ASSERT_RTNL();
2044
2045         memset(&addr, 0, sizeof(struct in6_addr));
2046         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2047
2048         if (idev->dev->flags&IFF_POINTOPOINT) {
2049                 addr.s6_addr32[0] = htonl(0xfe800000);
2050                 scope = IFA_LINK;
2051         } else {
2052                 scope = IPV6_ADDR_COMPATv4;
2053         }
2054
2055         if (addr.s6_addr32[3]) {
2056                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2057                 if (!IS_ERR(ifp)) {
2058                         spin_lock_bh(&ifp->lock);
2059                         ifp->flags &= ~IFA_F_TENTATIVE;
2060                         spin_unlock_bh(&ifp->lock);
2061                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2062                         in6_ifa_put(ifp);
2063                 }
2064                 return;
2065         }
2066
2067         for (dev = dev_base; dev != NULL; dev = dev->next) {
2068                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2069                 if (in_dev && (dev->flags & IFF_UP)) {
2070                         struct in_ifaddr * ifa;
2071
2072                         int flag = scope;
2073
2074                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2075                                 int plen;
2076
2077                                 addr.s6_addr32[3] = ifa->ifa_local;
2078
2079                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2080                                         continue;
2081                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2082                                         if (idev->dev->flags&IFF_POINTOPOINT)
2083                                                 continue;
2084                                         flag |= IFA_HOST;
2085                                 }
2086                                 if (idev->dev->flags&IFF_POINTOPOINT)
2087                                         plen = 64;
2088                                 else
2089                                         plen = 96;
2090
2091                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2092                                                     IFA_F_PERMANENT);
2093                                 if (!IS_ERR(ifp)) {
2094                                         spin_lock_bh(&ifp->lock);
2095                                         ifp->flags &= ~IFA_F_TENTATIVE;
2096                                         spin_unlock_bh(&ifp->lock);
2097                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2098                                         in6_ifa_put(ifp);
2099                                 }
2100                         }
2101                 }
2102         }
2103 }
2104 #endif
2105
2106 static void init_loopback(struct net_device *dev)
2107 {
2108         struct inet6_dev  *idev;
2109         struct inet6_ifaddr * ifp;
2110
2111         /* ::1 */
2112
2113         ASSERT_RTNL();
2114
2115         if ((idev = ipv6_find_idev(dev)) == NULL) {
2116                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2117                 return;
2118         }
2119
2120         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2121         if (!IS_ERR(ifp)) {
2122                 spin_lock_bh(&ifp->lock);
2123                 ifp->flags &= ~IFA_F_TENTATIVE;
2124                 spin_unlock_bh(&ifp->lock);
2125                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2126                 in6_ifa_put(ifp);
2127         }
2128 }
2129
2130 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2131 {
2132         struct inet6_ifaddr * ifp;
2133         u32 addr_flags = IFA_F_PERMANENT;
2134
2135 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2136         if (idev->cnf.optimistic_dad &&
2137             !ipv6_devconf.forwarding)
2138                 addr_flags |= IFA_F_OPTIMISTIC;
2139 #endif
2140
2141
2142         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2143         if (!IS_ERR(ifp)) {
2144                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2145                 addrconf_dad_start(ifp, 0);
2146                 in6_ifa_put(ifp);
2147         }
2148 }
2149
2150 static void addrconf_dev_config(struct net_device *dev)
2151 {
2152         struct in6_addr addr;
2153         struct inet6_dev    * idev;
2154
2155         ASSERT_RTNL();
2156
2157         if ((dev->type != ARPHRD_ETHER) &&
2158             (dev->type != ARPHRD_FDDI) &&
2159             (dev->type != ARPHRD_IEEE802_TR) &&
2160             (dev->type != ARPHRD_ARCNET) &&
2161             (dev->type != ARPHRD_INFINIBAND)) {
2162                 /* Alas, we support only Ethernet autoconfiguration. */
2163                 return;
2164         }
2165
2166         idev = addrconf_add_dev(dev);
2167         if (idev == NULL)
2168                 return;
2169
2170         memset(&addr, 0, sizeof(struct in6_addr));
2171         addr.s6_addr32[0] = htonl(0xFE800000);
2172
2173         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2174                 addrconf_add_linklocal(idev, &addr);
2175 }
2176
2177 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2178 static void addrconf_sit_config(struct net_device *dev)
2179 {
2180         struct inet6_dev *idev;
2181
2182         ASSERT_RTNL();
2183
2184         /*
2185          * Configure the tunnel with one of our IPv4
2186          * addresses... we should configure all of
2187          * our v4 addrs in the tunnel
2188          */
2189
2190         if ((idev = ipv6_find_idev(dev)) == NULL) {
2191                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2192                 return;
2193         }
2194
2195         sit_add_v4_addrs(idev);
2196
2197         if (dev->flags&IFF_POINTOPOINT) {
2198                 addrconf_add_mroute(dev);
2199                 addrconf_add_lroute(dev);
2200         } else
2201                 sit_route_add(dev);
2202 }
2203 #endif
2204
2205 static inline int
2206 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2207 {
2208         struct in6_addr lladdr;
2209
2210         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2211                 addrconf_add_linklocal(idev, &lladdr);
2212                 return 0;
2213         }
2214         return -1;
2215 }
2216
2217 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2218 {
2219         struct net_device *link_dev;
2220
2221         /* first try to inherit the link-local address from the link device */
2222         if (idev->dev->iflink &&
2223             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2224                 if (!ipv6_inherit_linklocal(idev, link_dev))
2225                         return;
2226         }
2227         /* then try to inherit it from any device */
2228         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2229                 if (!ipv6_inherit_linklocal(idev, link_dev))
2230                         return;
2231         }
2232         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2233 }
2234
2235 /*
2236  * Autoconfigure tunnel with a link-local address so routing protocols,
2237  * DHCPv6, MLD etc. can be run over the virtual link
2238  */
2239
2240 static void addrconf_ip6_tnl_config(struct net_device *dev)
2241 {
2242         struct inet6_dev *idev;
2243
2244         ASSERT_RTNL();
2245
2246         if ((idev = addrconf_add_dev(dev)) == NULL) {
2247                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2248                 return;
2249         }
2250         ip6_tnl_add_linklocal(idev);
2251 }
2252
2253 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2254                            void * data)
2255 {
2256         struct net_device *dev = (struct net_device *) data;
2257         struct inet6_dev *idev = __in6_dev_get(dev);
2258         int run_pending = 0;
2259
2260         switch(event) {
2261         case NETDEV_REGISTER:
2262                 if (!idev) {
2263                         idev = ipv6_add_dev(dev);
2264                         if (!idev)
2265                                 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2266                                         dev->name);
2267                 }
2268                 break;
2269         case NETDEV_UP:
2270         case NETDEV_CHANGE:
2271                 if (event == NETDEV_UP) {
2272                         if (!netif_carrier_ok(dev)) {
2273                                 /* device is not ready yet. */
2274                                 printk(KERN_INFO
2275                                         "ADDRCONF(NETDEV_UP): %s: "
2276                                         "link is not ready\n",
2277                                         dev->name);
2278                                 break;
2279                         }
2280
2281                         if (idev)
2282                                 idev->if_flags |= IF_READY;
2283                 } else {
2284                         if (!netif_carrier_ok(dev)) {
2285                                 /* device is still not ready. */
2286                                 break;
2287                         }
2288
2289                         if (idev) {
2290                                 if (idev->if_flags & IF_READY) {
2291                                         /* device is already configured. */
2292                                         break;
2293                                 }
2294                                 idev->if_flags |= IF_READY;
2295                         }
2296
2297                         printk(KERN_INFO
2298                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2299                                         "link becomes ready\n",
2300                                         dev->name);
2301
2302                         run_pending = 1;
2303                 }
2304
2305                 switch(dev->type) {
2306 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2307                 case ARPHRD_SIT:
2308                         addrconf_sit_config(dev);
2309                         break;
2310 #endif
2311                 case ARPHRD_TUNNEL6:
2312                         addrconf_ip6_tnl_config(dev);
2313                         break;
2314                 case ARPHRD_LOOPBACK:
2315                         init_loopback(dev);
2316                         break;
2317
2318                 default:
2319                         addrconf_dev_config(dev);
2320                         break;
2321                 }
2322                 if (idev) {
2323                         if (run_pending)
2324                                 addrconf_dad_run(idev);
2325
2326                         /* If the MTU changed during the interface down, when the
2327                            interface up, the changed MTU must be reflected in the
2328                            idev as well as routers.
2329                          */
2330                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2331                                 rt6_mtu_change(dev, dev->mtu);
2332                                 idev->cnf.mtu6 = dev->mtu;
2333                         }
2334                         idev->tstamp = jiffies;
2335                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2336                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2337                            stop IPv6 on this interface.
2338                          */
2339                         if (dev->mtu < IPV6_MIN_MTU)
2340                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2341                 }
2342                 break;
2343
2344         case NETDEV_CHANGEMTU:
2345                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2346                         rt6_mtu_change(dev, dev->mtu);
2347                         idev->cnf.mtu6 = dev->mtu;
2348                         break;
2349                 }
2350
2351                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2352
2353         case NETDEV_DOWN:
2354         case NETDEV_UNREGISTER:
2355                 /*
2356                  *      Remove all addresses from this interface.
2357                  */
2358                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2359                 break;
2360
2361         case NETDEV_CHANGENAME:
2362 #ifdef CONFIG_SYSCTL
2363                 if (idev) {
2364                         addrconf_sysctl_unregister(&idev->cnf);
2365                         neigh_sysctl_unregister(idev->nd_parms);
2366                         neigh_sysctl_register(dev, idev->nd_parms,
2367                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2368                                               &ndisc_ifinfo_sysctl_change,
2369                                               NULL);
2370                         addrconf_sysctl_register(idev, &idev->cnf);
2371                 }
2372 #endif
2373                 break;
2374         }
2375
2376         return NOTIFY_OK;
2377 }
2378
2379 /*
2380  *      addrconf module should be notified of a device going up
2381  */
2382 static struct notifier_block ipv6_dev_notf = {
2383         .notifier_call = addrconf_notify,
2384         .priority = 0
2385 };
2386
2387 static int addrconf_ifdown(struct net_device *dev, int how)
2388 {
2389         struct inet6_dev *idev;
2390         struct inet6_ifaddr *ifa, **bifa;
2391         int i;
2392
2393         ASSERT_RTNL();
2394
2395         if (dev == &loopback_dev && how == 1)
2396                 how = 0;
2397
2398         rt6_ifdown(dev);
2399         neigh_ifdown(&nd_tbl, dev);
2400
2401         idev = __in6_dev_get(dev);
2402         if (idev == NULL)
2403                 return -ENODEV;
2404
2405         /* Step 1: remove reference to ipv6 device from parent device.
2406                    Do not dev_put!
2407          */
2408         if (how == 1) {
2409                 idev->dead = 1;
2410
2411                 /* protected by rtnl_lock */
2412                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2413
2414                 /* Step 1.5: remove snmp6 entry */
2415                 snmp6_unregister_dev(idev);
2416
2417         }
2418
2419         /* Step 2: clear hash table */
2420         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2421                 bifa = &inet6_addr_lst[i];
2422
2423                 write_lock_bh(&addrconf_hash_lock);
2424                 while ((ifa = *bifa) != NULL) {
2425                         if (ifa->idev == idev) {
2426                                 *bifa = ifa->lst_next;
2427                                 ifa->lst_next = NULL;
2428                                 addrconf_del_timer(ifa);
2429                                 in6_ifa_put(ifa);
2430                                 continue;
2431                         }
2432                         bifa = &ifa->lst_next;
2433                 }
2434                 write_unlock_bh(&addrconf_hash_lock);
2435         }
2436
2437         write_lock_bh(&idev->lock);
2438
2439         /* Step 3: clear flags for stateless addrconf */
2440         if (how != 1)
2441                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2442
2443         /* Step 4: clear address list */
2444 #ifdef CONFIG_IPV6_PRIVACY
2445         if (how == 1 && del_timer(&idev->regen_timer))
2446                 in6_dev_put(idev);
2447
2448         /* clear tempaddr list */
2449         while ((ifa = idev->tempaddr_list) != NULL) {
2450                 idev->tempaddr_list = ifa->tmp_next;
2451                 ifa->tmp_next = NULL;
2452                 ifa->dead = 1;
2453                 write_unlock_bh(&idev->lock);
2454                 spin_lock_bh(&ifa->lock);
2455
2456                 if (ifa->ifpub) {
2457                         in6_ifa_put(ifa->ifpub);
2458                         ifa->ifpub = NULL;
2459                 }
2460                 spin_unlock_bh(&ifa->lock);
2461                 in6_ifa_put(ifa);
2462                 write_lock_bh(&idev->lock);
2463         }
2464 #endif
2465         while ((ifa = idev->addr_list) != NULL) {
2466                 idev->addr_list = ifa->if_next;
2467                 ifa->if_next = NULL;
2468                 ifa->dead = 1;
2469                 addrconf_del_timer(ifa);
2470                 write_unlock_bh(&idev->lock);
2471
2472                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2473                 in6_ifa_put(ifa);
2474
2475                 write_lock_bh(&idev->lock);
2476         }
2477         write_unlock_bh(&idev->lock);
2478
2479         /* Step 5: Discard multicast list */
2480
2481         if (how == 1)
2482                 ipv6_mc_destroy_dev(idev);
2483         else
2484                 ipv6_mc_down(idev);
2485
2486         /* Step 5: netlink notification of this interface */
2487         idev->tstamp = jiffies;
2488         inet6_ifinfo_notify(RTM_DELLINK, idev);
2489
2490         /* Shot the device (if unregistered) */
2491
2492         if (how == 1) {
2493 #ifdef CONFIG_SYSCTL
2494                 addrconf_sysctl_unregister(&idev->cnf);
2495                 neigh_sysctl_unregister(idev->nd_parms);
2496 #endif
2497                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2498                 neigh_ifdown(&nd_tbl, dev);
2499                 in6_dev_put(idev);
2500         }
2501         return 0;
2502 }
2503
2504 static void addrconf_rs_timer(unsigned long data)
2505 {
2506         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2507
2508         if (ifp->idev->cnf.forwarding)
2509                 goto out;
2510
2511         if (ifp->idev->if_flags & IF_RA_RCVD) {
2512                 /*
2513                  *      Announcement received after solicitation
2514                  *      was sent
2515                  */
2516                 goto out;
2517         }
2518
2519         spin_lock(&ifp->lock);
2520         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2521                 struct in6_addr all_routers;
2522
2523                 /* The wait after the last probe can be shorter */
2524                 addrconf_mod_timer(ifp, AC_RS,
2525                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2526                                    ifp->idev->cnf.rtr_solicit_delay :
2527                                    ifp->idev->cnf.rtr_solicit_interval);
2528                 spin_unlock(&ifp->lock);
2529
2530                 ipv6_addr_all_routers(&all_routers);
2531
2532                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2533         } else {
2534                 spin_unlock(&ifp->lock);
2535                 /*
2536                  * Note: we do not support deprecated "all on-link"
2537                  * assumption any longer.
2538                  */
2539                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2540                        ifp->idev->dev->name);
2541         }
2542
2543 out:
2544         in6_ifa_put(ifp);
2545 }
2546
2547 /*
2548  *      Duplicate Address Detection
2549  */
2550 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2551 {
2552         unsigned long rand_num;
2553         struct inet6_dev *idev = ifp->idev;
2554
2555         if (ifp->flags & IFA_F_OPTIMISTIC)
2556                 rand_num = 0;
2557         else
2558                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2559
2560         ifp->probes = idev->cnf.dad_transmits;
2561         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2562 }
2563
2564 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2565 {
2566         struct inet6_dev *idev = ifp->idev;
2567         struct net_device *dev = idev->dev;
2568
2569         addrconf_join_solict(dev, &ifp->addr);
2570
2571         net_srandom(ifp->addr.s6_addr32[3]);
2572
2573         read_lock_bh(&idev->lock);
2574         if (ifp->dead)
2575                 goto out;
2576         spin_lock_bh(&ifp->lock);
2577
2578         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2579             !(ifp->flags&IFA_F_TENTATIVE) ||
2580             ifp->flags & IFA_F_NODAD) {
2581                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2582                 spin_unlock_bh(&ifp->lock);
2583                 read_unlock_bh(&idev->lock);
2584
2585                 addrconf_dad_completed(ifp);
2586                 return;
2587         }
2588
2589         if (!(idev->if_flags & IF_READY)) {
2590                 spin_unlock_bh(&ifp->lock);
2591                 read_unlock_bh(&idev->lock);
2592                 /*
2593                  * If the defice is not ready:
2594                  * - keep it tentative if it is a permanent address.
2595                  * - otherwise, kill it.
2596                  */
2597                 in6_ifa_hold(ifp);
2598                 addrconf_dad_stop(ifp);
2599                 return;
2600         }
2601
2602         /*
2603          * Optimistic nodes can start receiving
2604          * Frames right away
2605          */
2606         if(ifp->flags & IFA_F_OPTIMISTIC)
2607                 ip6_ins_rt(ifp->rt);
2608
2609         addrconf_dad_kick(ifp);
2610         spin_unlock_bh(&ifp->lock);
2611 out:
2612         read_unlock_bh(&idev->lock);
2613 }
2614
2615 static void addrconf_dad_timer(unsigned long data)
2616 {
2617         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2618         struct inet6_dev *idev = ifp->idev;
2619         struct in6_addr unspec;
2620         struct in6_addr mcaddr;
2621
2622         read_lock_bh(&idev->lock);
2623         if (idev->dead) {
2624                 read_unlock_bh(&idev->lock);
2625                 goto out;
2626         }
2627         spin_lock_bh(&ifp->lock);
2628         if (ifp->probes == 0) {
2629                 /*
2630                  * DAD was successful
2631                  */
2632
2633                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2634                 spin_unlock_bh(&ifp->lock);
2635                 read_unlock_bh(&idev->lock);
2636
2637                 addrconf_dad_completed(ifp);
2638
2639                 goto out;
2640         }
2641
2642         ifp->probes--;
2643         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2644         spin_unlock_bh(&ifp->lock);
2645         read_unlock_bh(&idev->lock);
2646
2647         /* send a neighbour solicitation for our addr */
2648         memset(&unspec, 0, sizeof(unspec));
2649         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2650         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2651 out:
2652         in6_ifa_put(ifp);
2653 }
2654
2655 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2656 {
2657         struct net_device *     dev = ifp->idev->dev;
2658
2659         /*
2660          *      Configure the address for reception. Now it is valid.
2661          */
2662
2663         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2664
2665         /* If added prefix is link local and forwarding is off,
2666            start sending router solicitations.
2667          */
2668
2669         if (ifp->idev->cnf.forwarding == 0 &&
2670             ifp->idev->cnf.rtr_solicits > 0 &&
2671             (dev->flags&IFF_LOOPBACK) == 0 &&
2672             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2673                 struct in6_addr all_routers;
2674
2675                 ipv6_addr_all_routers(&all_routers);
2676
2677                 /*
2678                  *      If a host as already performed a random delay
2679                  *      [...] as part of DAD [...] there is no need
2680                  *      to delay again before sending the first RS
2681                  */
2682                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2683
2684                 spin_lock_bh(&ifp->lock);
2685                 ifp->probes = 1;
2686                 ifp->idev->if_flags |= IF_RS_SENT;
2687                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2688                 spin_unlock_bh(&ifp->lock);
2689         }
2690 }
2691
2692 static void addrconf_dad_run(struct inet6_dev *idev) {
2693         struct inet6_ifaddr *ifp;
2694
2695         read_lock_bh(&idev->lock);
2696         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2697                 spin_lock_bh(&ifp->lock);
2698                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2699                         spin_unlock_bh(&ifp->lock);
2700                         continue;
2701                 }
2702                 spin_unlock_bh(&ifp->lock);
2703                 addrconf_dad_kick(ifp);
2704         }
2705         read_unlock_bh(&idev->lock);
2706 }
2707
2708 #ifdef CONFIG_PROC_FS
2709 struct if6_iter_state {
2710         int bucket;
2711 };
2712
2713 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2714 {
2715         struct inet6_ifaddr *ifa = NULL;
2716         struct if6_iter_state *state = seq->private;
2717
2718         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2719                 ifa = inet6_addr_lst[state->bucket];
2720                 if (ifa)
2721                         break;
2722         }
2723         return ifa;
2724 }
2725
2726 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2727 {
2728         struct if6_iter_state *state = seq->private;
2729
2730         ifa = ifa->lst_next;
2731 try_again:
2732         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2733                 ifa = inet6_addr_lst[state->bucket];
2734                 goto try_again;
2735         }
2736         return ifa;
2737 }
2738
2739 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2740 {
2741         struct inet6_ifaddr *ifa = if6_get_first(seq);
2742
2743         if (ifa)
2744                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2745                         --pos;
2746         return pos ? NULL : ifa;
2747 }
2748
2749 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2750 {
2751         read_lock_bh(&addrconf_hash_lock);
2752         return if6_get_idx(seq, *pos);
2753 }
2754
2755 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2756 {
2757         struct inet6_ifaddr *ifa;
2758
2759         ifa = if6_get_next(seq, v);
2760         ++*pos;
2761         return ifa;
2762 }
2763
2764 static void if6_seq_stop(struct seq_file *seq, void *v)
2765 {
2766         read_unlock_bh(&addrconf_hash_lock);
2767 }
2768
2769 static int if6_seq_show(struct seq_file *seq, void *v)
2770 {
2771         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2772         seq_printf(seq,
2773                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2774                    NIP6(ifp->addr),
2775                    ifp->idev->dev->ifindex,
2776                    ifp->prefix_len,
2777                    ifp->scope,
2778                    ifp->flags,
2779                    ifp->idev->dev->name);
2780         return 0;
2781 }
2782
2783 static struct seq_operations if6_seq_ops = {
2784         .start  = if6_seq_start,
2785         .next   = if6_seq_next,
2786         .show   = if6_seq_show,
2787         .stop   = if6_seq_stop,
2788 };
2789
2790 static int if6_seq_open(struct inode *inode, struct file *file)
2791 {
2792         struct seq_file *seq;
2793         int rc = -ENOMEM;
2794         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2795
2796         if (!s)
2797                 goto out;
2798
2799         rc = seq_open(file, &if6_seq_ops);
2800         if (rc)
2801                 goto out_kfree;
2802
2803         seq = file->private_data;
2804         seq->private = s;
2805 out:
2806         return rc;
2807 out_kfree:
2808         kfree(s);
2809         goto out;
2810 }
2811
2812 static const struct file_operations if6_fops = {
2813         .owner          = THIS_MODULE,
2814         .open           = if6_seq_open,
2815         .read           = seq_read,
2816         .llseek         = seq_lseek,
2817         .release        = seq_release_private,
2818 };
2819
2820 int __init if6_proc_init(void)
2821 {
2822         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2823                 return -ENOMEM;
2824         return 0;
2825 }
2826
2827 void if6_proc_exit(void)
2828 {
2829         proc_net_remove("if_inet6");
2830 }
2831 #endif  /* CONFIG_PROC_FS */
2832
2833 #ifdef CONFIG_IPV6_MIP6
2834 /* Check if address is a home address configured on any interface. */
2835 int ipv6_chk_home_addr(struct in6_addr *addr)
2836 {
2837         int ret = 0;
2838         struct inet6_ifaddr * ifp;
2839         u8 hash = ipv6_addr_hash(addr);
2840         read_lock_bh(&addrconf_hash_lock);
2841         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2842                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2843                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2844                         ret = 1;
2845                         break;
2846                 }
2847         }
2848         read_unlock_bh(&addrconf_hash_lock);
2849         return ret;
2850 }
2851 #endif
2852
2853 /*
2854  *      Periodic address status verification
2855  */
2856
2857 static void addrconf_verify(unsigned long foo)
2858 {
2859         struct inet6_ifaddr *ifp;
2860         unsigned long now, next;
2861         int i;
2862
2863         spin_lock_bh(&addrconf_verify_lock);
2864         now = jiffies;
2865         next = now + ADDR_CHECK_FREQUENCY;
2866
2867         del_timer(&addr_chk_timer);
2868
2869         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2870
2871 restart:
2872                 read_lock(&addrconf_hash_lock);
2873                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2874                         unsigned long age;
2875 #ifdef CONFIG_IPV6_PRIVACY
2876                         unsigned long regen_advance;
2877 #endif
2878
2879                         if (ifp->flags & IFA_F_PERMANENT)
2880                                 continue;
2881
2882                         spin_lock(&ifp->lock);
2883                         age = (now - ifp->tstamp) / HZ;
2884
2885 #ifdef CONFIG_IPV6_PRIVACY
2886                         regen_advance = ifp->idev->cnf.regen_max_retry *
2887                                         ifp->idev->cnf.dad_transmits *
2888                                         ifp->idev->nd_parms->retrans_time / HZ;
2889 #endif
2890
2891                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2892                             age >= ifp->valid_lft) {
2893                                 spin_unlock(&ifp->lock);
2894                                 in6_ifa_hold(ifp);
2895                                 read_unlock(&addrconf_hash_lock);
2896                                 ipv6_del_addr(ifp);
2897                                 goto restart;
2898                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2899                                 spin_unlock(&ifp->lock);
2900                                 continue;
2901                         } else if (age >= ifp->prefered_lft) {
2902                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2903                                 int deprecate = 0;
2904
2905                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2906                                         deprecate = 1;
2907                                         ifp->flags |= IFA_F_DEPRECATED;
2908                                 }
2909
2910                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2911                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2912
2913                                 spin_unlock(&ifp->lock);
2914
2915                                 if (deprecate) {
2916                                         in6_ifa_hold(ifp);
2917                                         read_unlock(&addrconf_hash_lock);
2918
2919                                         ipv6_ifa_notify(0, ifp);
2920                                         in6_ifa_put(ifp);
2921                                         goto restart;
2922                                 }
2923 #ifdef CONFIG_IPV6_PRIVACY
2924                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2925                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2926                                 if (age >= ifp->prefered_lft - regen_advance) {
2927                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2928                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2929                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2930                                         if (!ifp->regen_count && ifpub) {
2931                                                 ifp->regen_count++;
2932                                                 in6_ifa_hold(ifp);
2933                                                 in6_ifa_hold(ifpub);
2934                                                 spin_unlock(&ifp->lock);
2935                                                 read_unlock(&addrconf_hash_lock);
2936                                                 spin_lock(&ifpub->lock);
2937                                                 ifpub->regen_count = 0;
2938                                                 spin_unlock(&ifpub->lock);
2939                                                 ipv6_create_tempaddr(ifpub, ifp);
2940                                                 in6_ifa_put(ifpub);
2941                                                 in6_ifa_put(ifp);
2942                                                 goto restart;
2943                                         }
2944                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2945                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2946                                 spin_unlock(&ifp->lock);
2947 #endif
2948                         } else {
2949                                 /* ifp->prefered_lft <= ifp->valid_lft */
2950                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2951                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2952                                 spin_unlock(&ifp->lock);
2953                         }
2954                 }
2955                 read_unlock(&addrconf_hash_lock);
2956         }
2957
2958         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2959         add_timer(&addr_chk_timer);
2960         spin_unlock_bh(&addrconf_verify_lock);
2961 }
2962
2963 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2964 {
2965         struct in6_addr *pfx = NULL;
2966
2967         if (addr)
2968                 pfx = nla_data(addr);
2969
2970         if (local) {
2971                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2972                         pfx = NULL;
2973                 else
2974                         pfx = nla_data(local);
2975         }
2976
2977         return pfx;
2978 }
2979
2980 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2981         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2982         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2983         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2984 };
2985
2986 static int
2987 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2988 {
2989         struct ifaddrmsg *ifm;
2990         struct nlattr *tb[IFA_MAX+1];
2991         struct in6_addr *pfx;
2992         int err;
2993
2994         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2995         if (err < 0)
2996                 return err;
2997
2998         ifm = nlmsg_data(nlh);
2999         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3000         if (pfx == NULL)
3001                 return -EINVAL;
3002
3003         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3004 }
3005
3006 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3007                              u32 prefered_lft, u32 valid_lft)
3008 {
3009         u32 flags = RTF_EXPIRES;
3010
3011         if (!valid_lft || (prefered_lft > valid_lft))
3012                 return -EINVAL;
3013
3014         if (valid_lft == INFINITY_LIFE_TIME) {
3015                 ifa_flags |= IFA_F_PERMANENT;
3016                 flags = 0;
3017         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3018                 valid_lft = 0x7FFFFFFF/HZ;
3019
3020         if (prefered_lft == 0)
3021                 ifa_flags |= IFA_F_DEPRECATED;
3022         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3023                  (prefered_lft != INFINITY_LIFE_TIME))
3024                 prefered_lft = 0x7FFFFFFF/HZ;
3025
3026         spin_lock_bh(&ifp->lock);
3027         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3028         ifp->tstamp = jiffies;
3029         ifp->valid_lft = valid_lft;
3030         ifp->prefered_lft = prefered_lft;
3031
3032         spin_unlock_bh(&ifp->lock);
3033         if (!(ifp->flags&IFA_F_TENTATIVE))
3034                 ipv6_ifa_notify(0, ifp);
3035
3036         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3037                               jiffies_to_clock_t(valid_lft * HZ), flags);
3038         addrconf_verify(0);
3039
3040         return 0;
3041 }
3042
3043 static int
3044 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3045 {
3046         struct ifaddrmsg *ifm;
3047         struct nlattr *tb[IFA_MAX+1];
3048         struct in6_addr *pfx;
3049         struct inet6_ifaddr *ifa;
3050         struct net_device *dev;
3051         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3052         u8 ifa_flags;
3053         int err;
3054
3055         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3056         if (err < 0)
3057                 return err;
3058
3059         ifm = nlmsg_data(nlh);
3060         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3061         if (pfx == NULL)
3062                 return -EINVAL;
3063
3064         if (tb[IFA_CACHEINFO]) {
3065                 struct ifa_cacheinfo *ci;
3066
3067                 ci = nla_data(tb[IFA_CACHEINFO]);
3068                 valid_lft = ci->ifa_valid;
3069                 preferred_lft = ci->ifa_prefered;
3070         } else {
3071                 preferred_lft = INFINITY_LIFE_TIME;
3072                 valid_lft = INFINITY_LIFE_TIME;
3073         }
3074
3075         dev =  __dev_get_by_index(ifm->ifa_index);
3076         if (dev == NULL)
3077                 return -ENODEV;
3078
3079         /* We ignore other flags so far. */
3080         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3081
3082         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3083         if (ifa == NULL) {
3084                 /*
3085                  * It would be best to check for !NLM_F_CREATE here but
3086                  * userspace alreay relies on not having to provide this.
3087                  */
3088                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3089                                       ifa_flags, preferred_lft, valid_lft);
3090         }
3091
3092         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3093             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3094                 err = -EEXIST;
3095         else
3096                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3097
3098         in6_ifa_put(ifa);
3099
3100         return err;
3101 }
3102
3103 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3104                           u8 scope, int ifindex)
3105 {
3106         struct ifaddrmsg *ifm;
3107
3108         ifm = nlmsg_data(nlh);
3109         ifm->ifa_family = AF_INET6;
3110         ifm->ifa_prefixlen = prefixlen;
3111         ifm->ifa_flags = flags;
3112         ifm->ifa_scope = scope;
3113         ifm->ifa_index = ifindex;
3114 }
3115
3116 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3117                          unsigned long tstamp, u32 preferred, u32 valid)
3118 {
3119         struct ifa_cacheinfo ci;
3120
3121         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3122                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3123         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3124                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3125         ci.ifa_prefered = preferred;
3126         ci.ifa_valid = valid;
3127
3128         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3129 }
3130
3131 static inline int rt_scope(int ifa_scope)
3132 {
3133         if (ifa_scope & IFA_HOST)
3134                 return RT_SCOPE_HOST;
3135         else if (ifa_scope & IFA_LINK)
3136                 return RT_SCOPE_LINK;
3137         else if (ifa_scope & IFA_SITE)
3138                 return RT_SCOPE_SITE;
3139         else
3140                 return RT_SCOPE_UNIVERSE;
3141 }
3142
3143 static inline int inet6_ifaddr_msgsize(void)
3144 {
3145         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3146                + nla_total_size(16) /* IFA_ADDRESS */
3147                + nla_total_size(sizeof(struct ifa_cacheinfo));
3148 }
3149
3150 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3151                              u32 pid, u32 seq, int event, unsigned int flags)
3152 {
3153         struct nlmsghdr  *nlh;
3154         u32 preferred, valid;
3155
3156         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3157         if (nlh == NULL)
3158                 return -EMSGSIZE;
3159
3160         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3161                       ifa->idev->dev->ifindex);
3162
3163         if (!(ifa->flags&IFA_F_PERMANENT)) {
3164                 preferred = ifa->prefered_lft;
3165                 valid = ifa->valid_lft;
3166                 if (preferred != INFINITY_LIFE_TIME) {
3167                         long tval = (jiffies - ifa->tstamp)/HZ;
3168                         preferred -= tval;
3169                         if (valid != INFINITY_LIFE_TIME)
3170                                 valid -= tval;
3171                 }
3172         } else {
3173                 preferred = INFINITY_LIFE_TIME;
3174                 valid = INFINITY_LIFE_TIME;
3175         }
3176
3177         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3178             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3179                 nlmsg_cancel(skb, nlh);
3180                 return -EMSGSIZE;
3181         }
3182
3183         return nlmsg_end(skb, nlh);
3184 }
3185
3186 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3187                                 u32 pid, u32 seq, int event, u16 flags)
3188 {
3189         struct nlmsghdr  *nlh;
3190         u8 scope = RT_SCOPE_UNIVERSE;
3191         int ifindex = ifmca->idev->dev->ifindex;
3192
3193         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3194                 scope = RT_SCOPE_SITE;
3195
3196         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3197         if (nlh == NULL)
3198                 return -EMSGSIZE;
3199
3200         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3201         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3202             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3203                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3204                 nlmsg_cancel(skb, nlh);
3205                 return -EMSGSIZE;
3206         }
3207
3208         return nlmsg_end(skb, nlh);
3209 }
3210
3211 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3212                                 u32 pid, u32 seq, int event, unsigned int flags)
3213 {
3214         struct nlmsghdr  *nlh;
3215         u8 scope = RT_SCOPE_UNIVERSE;
3216         int ifindex = ifaca->aca_idev->dev->ifindex;
3217
3218         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3219                 scope = RT_SCOPE_SITE;
3220
3221         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3222         if (nlh == NULL)
3223                 return -EMSGSIZE;
3224
3225         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3226         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3227             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3228                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3229                 nlmsg_cancel(skb, nlh);
3230                 return -EMSGSIZE;
3231         }
3232
3233         return nlmsg_end(skb, nlh);
3234 }
3235
3236 enum addr_type_t
3237 {
3238         UNICAST_ADDR,
3239         MULTICAST_ADDR,
3240         ANYCAST_ADDR,
3241 };
3242
3243 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3244                            enum addr_type_t type)
3245 {
3246         int idx, ip_idx;
3247         int s_idx, s_ip_idx;
3248         int err = 1;
3249         struct net_device *dev;
3250         struct inet6_dev *idev = NULL;
3251         struct inet6_ifaddr *ifa;
3252         struct ifmcaddr6 *ifmca;
3253         struct ifacaddr6 *ifaca;
3254
3255         s_idx = cb->args[0];
3256         s_ip_idx = ip_idx = cb->args[1];
3257
3258         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3259                 if (idx < s_idx)
3260                         continue;
3261                 if (idx > s_idx)
3262                         s_ip_idx = 0;
3263                 ip_idx = 0;
3264                 if ((idev = in6_dev_get(dev)) == NULL)
3265                         continue;
3266                 read_lock_bh(&idev->lock);
3267                 switch (type) {
3268                 case UNICAST_ADDR:
3269                         /* unicast address incl. temp addr */
3270                         for (ifa = idev->addr_list; ifa;
3271                              ifa = ifa->if_next, ip_idx++) {
3272                                 if (ip_idx < s_ip_idx)
3273                                         continue;
3274                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3275                                     NETLINK_CB(cb->skb).pid,
3276                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3277                                     NLM_F_MULTI)) <= 0)
3278                                         goto done;
3279                         }
3280                         break;
3281                 case MULTICAST_ADDR:
3282                         /* multicast address */
3283                         for (ifmca = idev->mc_list; ifmca;
3284                              ifmca = ifmca->next, ip_idx++) {
3285                                 if (ip_idx < s_ip_idx)
3286                                         continue;
3287                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3288                                     NETLINK_CB(cb->skb).pid,
3289                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3290                                     NLM_F_MULTI)) <= 0)
3291                                         goto done;
3292                         }
3293                         break;
3294                 case ANYCAST_ADDR:
3295                         /* anycast address */
3296                         for (ifaca = idev->ac_list; ifaca;
3297                              ifaca = ifaca->aca_next, ip_idx++) {
3298                                 if (ip_idx < s_ip_idx)
3299                                         continue;
3300                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3301                                     NETLINK_CB(cb->skb).pid,
3302                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3303                                     NLM_F_MULTI)) <= 0)
3304                                         goto done;
3305                         }
3306                         break;
3307                 default:
3308                         break;
3309                 }
3310                 read_unlock_bh(&idev->lock);
3311                 in6_dev_put(idev);
3312         }
3313 done:
3314         if (err <= 0) {
3315                 read_unlock_bh(&idev->lock);
3316                 in6_dev_put(idev);
3317         }
3318         cb->args[0] = idx;
3319         cb->args[1] = ip_idx;
3320         return skb->len;
3321 }
3322
3323 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3324 {
3325         enum addr_type_t type = UNICAST_ADDR;
3326         return inet6_dump_addr(skb, cb, type);
3327 }
3328
3329 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3330 {
3331         enum addr_type_t type = MULTICAST_ADDR;
3332         return inet6_dump_addr(skb, cb, type);
3333 }
3334
3335
3336 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3337 {
3338         enum addr_type_t type = ANYCAST_ADDR;
3339         return inet6_dump_addr(skb, cb, type);
3340 }
3341
3342 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3343                              void *arg)
3344 {
3345         struct ifaddrmsg *ifm;
3346         struct nlattr *tb[IFA_MAX+1];
3347         struct in6_addr *addr = NULL;
3348         struct net_device *dev = NULL;
3349         struct inet6_ifaddr *ifa;
3350         struct sk_buff *skb;
3351         int err;
3352
3353         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3354         if (err < 0)
3355                 goto errout;
3356
3357         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3358         if (addr == NULL) {
3359                 err = -EINVAL;
3360                 goto errout;
3361         }
3362
3363         ifm = nlmsg_data(nlh);
3364         if (ifm->ifa_index)
3365                 dev = __dev_get_by_index(ifm->ifa_index);
3366
3367         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3368                 err = -EADDRNOTAVAIL;
3369                 goto errout;
3370         }
3371
3372         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3373                 err = -ENOBUFS;
3374                 goto errout_ifa;
3375         }
3376
3377         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3378                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3379         if (err < 0) {
3380                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3381                 WARN_ON(err == -EMSGSIZE);
3382                 kfree_skb(skb);
3383                 goto errout_ifa;
3384         }
3385         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3386 errout_ifa:
3387         in6_ifa_put(ifa);
3388 errout:
3389         return err;
3390 }
3391
3392 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3393 {
3394         struct sk_buff *skb;
3395         int err = -ENOBUFS;
3396
3397         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3398         if (skb == NULL)
3399                 goto errout;
3400
3401         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3402         if (err < 0) {
3403                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3404                 WARN_ON(err == -EMSGSIZE);
3405                 kfree_skb(skb);
3406                 goto errout;
3407         }
3408         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3409 errout:
3410         if (err < 0)
3411                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3412 }
3413
3414 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3415                                 __s32 *array, int bytes)
3416 {
3417         BUG_ON(bytes < (DEVCONF_MAX * 4));
3418
3419         memset(array, 0, bytes);
3420         array[DEVCONF_FORWARDING] = cnf->forwarding;
3421         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3422         array[DEVCONF_MTU6] = cnf->mtu6;
3423         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3424         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3425         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3426         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3427         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3428         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3429         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3430         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3431 #ifdef CONFIG_IPV6_PRIVACY
3432         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3433         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3434         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3435         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3436         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3437 #endif
3438         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3439         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3440         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3441 #ifdef CONFIG_IPV6_ROUTER_PREF
3442         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3443         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3444 #ifdef CONFIG_IPV6_ROUTE_INFO
3445         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3446 #endif
3447 #endif
3448         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3449         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3450 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3451         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3452 #endif
3453 }
3454
3455 static inline size_t inet6_if_nlmsg_size(void)
3456 {
3457         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3458                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3459                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3460                + nla_total_size(4) /* IFLA_MTU */
3461                + nla_total_size(4) /* IFLA_LINK */
3462                + nla_total_size( /* IFLA_PROTINFO */
3463                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3464                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3465                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3466                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3467                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3468                  );
3469 }
3470
3471 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3472                                       int bytes)
3473 {
3474         int i;
3475         int pad = bytes - sizeof(u64) * items;
3476         BUG_ON(pad < 0);
3477
3478         /* Use put_unaligned() because stats may not be aligned for u64. */
3479         put_unaligned(items, &stats[0]);
3480         for (i = 1; i < items; i++)
3481                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3482
3483         memset(&stats[items], 0, pad);
3484 }
3485
3486 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3487                              int bytes)
3488 {
3489         switch(attrtype) {
3490         case IFLA_INET6_STATS:
3491                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3492                 break;
3493         case IFLA_INET6_ICMP6STATS:
3494                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3495                 break;
3496         }
3497 }
3498
3499 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3500                              u32 pid, u32 seq, int event, unsigned int flags)
3501 {
3502         struct net_device *dev = idev->dev;
3503         struct nlattr *nla;
3504         struct ifinfomsg *hdr;
3505         struct nlmsghdr *nlh;
3506         void *protoinfo;
3507         struct ifla_cacheinfo ci;
3508
3509         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3510         if (nlh == NULL)
3511                 return -EMSGSIZE;
3512
3513         hdr = nlmsg_data(nlh);
3514         hdr->ifi_family = AF_INET6;
3515         hdr->__ifi_pad = 0;
3516         hdr->ifi_type = dev->type;
3517         hdr->ifi_index = dev->ifindex;
3518         hdr->ifi_flags = dev_get_flags(dev);
3519         hdr->ifi_change = 0;
3520
3521         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3522
3523         if (dev->addr_len)
3524                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3525
3526         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3527         if (dev->ifindex != dev->iflink)
3528                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3529
3530         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3531         if (protoinfo == NULL)
3532                 goto nla_put_failure;
3533
3534         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3535
3536         ci.max_reasm_len = IPV6_MAXPLEN;
3537         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3538                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3539         ci.reachable_time = idev->nd_parms->reachable_time;
3540         ci.retrans_time = idev->nd_parms->retrans_time;
3541         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3542
3543         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3544         if (nla == NULL)
3545                 goto nla_put_failure;
3546         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3547
3548         /* XXX - MC not implemented */
3549
3550         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3551         if (nla == NULL)
3552                 goto nla_put_failure;
3553         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3554
3555         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3556         if (nla == NULL)
3557                 goto nla_put_failure;
3558         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3559
3560         nla_nest_end(skb, protoinfo);
3561         return nlmsg_end(skb, nlh);
3562
3563 nla_put_failure:
3564         nlmsg_cancel(skb, nlh);
3565         return -EMSGSIZE;
3566 }
3567
3568 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3569 {
3570         int idx, err;
3571         int s_idx = cb->args[0];
3572         struct net_device *dev;
3573         struct inet6_dev *idev;
3574
3575         read_lock(&dev_base_lock);
3576         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3577                 if (idx < s_idx)
3578                         continue;
3579                 if ((idev = in6_dev_get(dev)) == NULL)
3580                         continue;
3581                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3582                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3583                 in6_dev_put(idev);
3584                 if (err <= 0)
3585                         break;
3586         }
3587         read_unlock(&dev_base_lock);
3588         cb->args[0] = idx;
3589
3590         return skb->len;
3591 }
3592
3593 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3594 {
3595         struct sk_buff *skb;
3596         int err = -ENOBUFS;
3597
3598         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3599         if (skb == NULL)
3600                 goto errout;
3601
3602         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3603         if (err < 0) {
3604                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3605                 WARN_ON(err == -EMSGSIZE);
3606                 kfree_skb(skb);
3607                 goto errout;
3608         }
3609         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3610 errout:
3611         if (err < 0)
3612                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3613 }
3614
3615 static inline size_t inet6_prefix_nlmsg_size(void)
3616 {
3617         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3618                + nla_total_size(sizeof(struct in6_addr))
3619                + nla_total_size(sizeof(struct prefix_cacheinfo));
3620 }
3621
3622 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3623                              struct prefix_info *pinfo, u32 pid, u32 seq,
3624                              int event, unsigned int flags)
3625 {
3626         struct prefixmsg *pmsg;
3627         struct nlmsghdr *nlh;
3628         struct prefix_cacheinfo ci;
3629
3630         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3631         if (nlh == NULL)
3632                 return -EMSGSIZE;
3633
3634         pmsg = nlmsg_data(nlh);
3635         pmsg->prefix_family = AF_INET6;
3636         pmsg->prefix_pad1 = 0;
3637         pmsg->prefix_pad2 = 0;
3638         pmsg->prefix_ifindex = idev->dev->ifindex;
3639         pmsg->prefix_len = pinfo->prefix_len;
3640         pmsg->prefix_type = pinfo->type;
3641         pmsg->prefix_pad3 = 0;
3642         pmsg->prefix_flags = 0;
3643         if (pinfo->onlink)
3644                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3645         if (pinfo->autoconf)
3646                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3647
3648         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3649
3650         ci.preferred_time = ntohl(pinfo->prefered);
3651         ci.valid_time = ntohl(pinfo->valid);
3652         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3653
3654         return nlmsg_end(skb, nlh);
3655
3656 nla_put_failure:
3657         nlmsg_cancel(skb, nlh);
3658         return -EMSGSIZE;
3659 }
3660
3661 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3662                          struct prefix_info *pinfo)
3663 {
3664         struct sk_buff *skb;
3665         int err = -ENOBUFS;
3666
3667         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3668         if (skb == NULL)
3669                 goto errout;
3670
3671         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3672         if (err < 0) {
3673                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3674                 WARN_ON(err == -EMSGSIZE);
3675                 kfree_skb(skb);
3676                 goto errout;
3677         }
3678         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3679 errout:
3680         if (err < 0)
3681                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3682 }
3683
3684 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3685 {
3686         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3687
3688         switch (event) {
3689         case RTM_NEWADDR:
3690                 /*
3691                  * If the address was optimistic
3692                  * we inserted the route at the start of
3693                  * our DAD process, so we don't need
3694                  * to do it again
3695                  */
3696                 if (!(ifp->rt->rt6i_node))
3697                         ip6_ins_rt(ifp->rt);
3698                 if (ifp->idev->cnf.forwarding)
3699                         addrconf_join_anycast(ifp);
3700                 break;
3701         case RTM_DELADDR:
3702                 if (ifp->idev->cnf.forwarding)
3703                         addrconf_leave_anycast(ifp);
3704                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3705                 dst_hold(&ifp->rt->u.dst);
3706                 if (ip6_del_rt(ifp->rt))
3707                         dst_free(&ifp->rt->u.dst);
3708                 break;
3709         }
3710 }
3711
3712 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3713 {
3714         rcu_read_lock_bh();
3715         if (likely(ifp->idev->dead == 0))
3716                 __ipv6_ifa_notify(event, ifp);
3717         rcu_read_unlock_bh();
3718 }
3719
3720 #ifdef CONFIG_SYSCTL
3721
3722 static
3723 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3724                            void __user *buffer, size_t *lenp, loff_t *ppos)
3725 {
3726         int *valp = ctl->data;
3727         int val = *valp;
3728         int ret;
3729
3730         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3731
3732         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3733                 if (valp != &ipv6_devconf.forwarding) {
3734                         if ((!*valp) ^ (!val)) {
3735                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3736                                 if (idev == NULL)
3737                                         return ret;
3738                                 dev_forward_change(idev);
3739                         }
3740                 } else {
3741                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3742                         addrconf_forward_change();
3743                 }
3744                 if (*valp)
3745                         rt6_purge_dflt_routers();
3746         }
3747
3748         return ret;
3749 }
3750
3751 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3752                                             int __user *name, int nlen,
3753                                             void __user *oldval,
3754                                             size_t __user *oldlenp,
3755                                             void __user *newval, size_t newlen)
3756 {
3757         int *valp = table->data;
3758         int new;
3759
3760         if (!newval || !newlen)
3761                 return 0;
3762         if (newlen != sizeof(int))
3763                 return -EINVAL;
3764         if (get_user(new, (int __user *)newval))
3765                 return -EFAULT;
3766         if (new == *valp)
3767                 return 0;
3768         if (oldval && oldlenp) {
3769                 size_t len;
3770                 if (get_user(len, oldlenp))
3771                         return -EFAULT;
3772                 if (len) {
3773                         if (len > table->maxlen)
3774                                 len = table->maxlen;
3775                         if (copy_to_user(oldval, valp, len))
3776                                 return -EFAULT;
3777                         if (put_user(len, oldlenp))
3778                                 return -EFAULT;
3779                 }
3780         }
3781
3782         if (valp != &ipv6_devconf_dflt.forwarding) {
3783                 if (valp != &ipv6_devconf.forwarding) {
3784                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3785                         int changed;
3786                         if (unlikely(idev == NULL))
3787                                 return -ENODEV;
3788                         changed = (!*valp) ^ (!new);
3789                         *valp = new;
3790                         if (changed)
3791                                 dev_forward_change(idev);
3792                 } else {
3793                         *valp = new;
3794                         addrconf_forward_change();
3795                 }
3796
3797                 if (*valp)
3798                         rt6_purge_dflt_routers();
3799         } else
3800                 *valp = new;
3801
3802         return 1;
3803 }
3804
3805 static struct addrconf_sysctl_table
3806 {
3807         struct ctl_table_header *sysctl_header;
3808         ctl_table addrconf_vars[__NET_IPV6_MAX];
3809         ctl_table addrconf_dev[2];
3810         ctl_table addrconf_conf_dir[2];
3811         ctl_table addrconf_proto_dir[2];
3812         ctl_table addrconf_root_dir[2];
3813 } addrconf_sysctl __read_mostly = {
3814         .sysctl_header = NULL,
3815         .addrconf_vars = {
3816                 {
3817                         .ctl_name       =       NET_IPV6_FORWARDING,
3818                         .procname       =       "forwarding",
3819                         .data           =       &ipv6_devconf.forwarding,
3820                         .maxlen         =       sizeof(int),
3821                         .mode           =       0644,
3822                         .proc_handler   =       &addrconf_sysctl_forward,
3823                         .strategy       =       &addrconf_sysctl_forward_strategy,
3824                 },
3825                 {
3826                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3827                         .procname       =       "hop_limit",
3828                         .data           =       &ipv6_devconf.hop_limit,
3829                         .maxlen         =       sizeof(int),
3830                         .mode           =       0644,
3831                         .proc_handler   =       proc_dointvec,
3832                 },
3833                 {
3834                         .ctl_name       =       NET_IPV6_MTU,
3835                         .procname       =       "mtu",
3836                         .data           =       &ipv6_devconf.mtu6,
3837                         .maxlen         =       sizeof(int),
3838                         .mode           =       0644,
3839                         .proc_handler   =       &proc_dointvec,
3840                 },
3841                 {
3842                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3843                         .procname       =       "accept_ra",
3844                         .data           =       &ipv6_devconf.accept_ra,
3845                         .maxlen         =       sizeof(int),
3846                         .mode           =       0644,
3847                         .proc_handler   =       &proc_dointvec,
3848                 },
3849                 {
3850                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3851                         .procname       =       "accept_redirects",
3852                         .data           =       &ipv6_devconf.accept_redirects,
3853                         .maxlen         =       sizeof(int),
3854                         .mode           =       0644,
3855                         .proc_handler   =       &proc_dointvec,
3856                 },
3857                 {
3858                         .ctl_name       =       NET_IPV6_AUTOCONF,
3859                         .procname       =       "autoconf",
3860                         .data           =       &ipv6_devconf.autoconf,
3861                         .maxlen         =       sizeof(int),
3862                         .mode           =       0644,
3863                         .proc_handler   =       &proc_dointvec,
3864                 },
3865                 {
3866                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3867                         .procname       =       "dad_transmits",
3868                         .data           =       &ipv6_devconf.dad_transmits,
3869                         .maxlen         =       sizeof(int),
3870                         .mode           =       0644,
3871                         .proc_handler   =       &proc_dointvec,
3872                 },
3873                 {
3874                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3875                         .procname       =       "router_solicitations",
3876                         .data           =       &ipv6_devconf.rtr_solicits,
3877                         .maxlen         =       sizeof(int),
3878                         .mode           =       0644,
3879                         .proc_handler   =       &proc_dointvec,
3880                 },
3881                 {
3882                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3883                         .procname       =       "router_solicitation_interval",
3884                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3885                         .maxlen         =       sizeof(int),
3886                         .mode           =       0644,
3887                         .proc_handler   =       &proc_dointvec_jiffies,
3888                         .strategy       =       &sysctl_jiffies,
3889                 },
3890                 {
3891                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3892                         .procname       =       "router_solicitation_delay",
3893                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3894                         .maxlen         =       sizeof(int),
3895                         .mode           =       0644,
3896                         .proc_handler   =       &proc_dointvec_jiffies,
3897                         .strategy       =       &sysctl_jiffies,
3898                 },
3899                 {
3900                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3901                         .procname       =       "force_mld_version",
3902                         .data           =       &ipv6_devconf.force_mld_version,
3903                         .maxlen         =       sizeof(int),
3904                         .mode           =       0644,
3905                         .proc_handler   =       &proc_dointvec,
3906                 },
3907 #ifdef CONFIG_IPV6_PRIVACY
3908                 {
3909                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3910                         .procname       =       "use_tempaddr",
3911                         .data           =       &ipv6_devconf.use_tempaddr,
3912                         .maxlen         =       sizeof(int),
3913                         .mode           =       0644,
3914                         .proc_handler   =       &proc_dointvec,
3915                 },
3916                 {
3917                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3918                         .procname       =       "temp_valid_lft",
3919                         .data           =       &ipv6_devconf.temp_valid_lft,
3920                         .maxlen         =       sizeof(int),
3921                         .mode           =       0644,
3922                         .proc_handler   =       &proc_dointvec,
3923                 },
3924                 {
3925                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3926                         .procname       =       "temp_prefered_lft",
3927                         .data           =       &ipv6_devconf.temp_prefered_lft,
3928                         .maxlen         =       sizeof(int),
3929                         .mode           =       0644,
3930                         .proc_handler   =       &proc_dointvec,
3931                 },
3932                 {
3933                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3934                         .procname       =       "regen_max_retry",
3935                         .data           =       &ipv6_devconf.regen_max_retry,
3936                         .maxlen         =       sizeof(int),
3937                         .mode           =       0644,
3938                         .proc_handler   =       &proc_dointvec,
3939                 },
3940                 {
3941                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3942                         .procname       =       "max_desync_factor",
3943                         .data           =       &ipv6_devconf.max_desync_factor,
3944                         .maxlen         =       sizeof(int),
3945                         .mode           =       0644,
3946                         .proc_handler   =       &proc_dointvec,
3947                 },
3948 #endif
3949                 {
3950                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3951                         .procname       =       "max_addresses",
3952                         .data           =       &ipv6_devconf.max_addresses,
3953                         .maxlen         =       sizeof(int),
3954                         .mode           =       0644,
3955                         .proc_handler   =       &proc_dointvec,
3956                 },
3957                 {
3958                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3959                         .procname       =       "accept_ra_defrtr",
3960                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3961                         .maxlen         =       sizeof(int),
3962                         .mode           =       0644,
3963                         .proc_handler   =       &proc_dointvec,
3964                 },
3965                 {
3966                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3967                         .procname       =       "accept_ra_pinfo",
3968                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3969                         .maxlen         =       sizeof(int),
3970                         .mode           =       0644,
3971                         .proc_handler   =       &proc_dointvec,
3972                 },
3973 #ifdef CONFIG_IPV6_ROUTER_PREF
3974                 {
3975                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3976                         .procname       =       "accept_ra_rtr_pref",
3977                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3978                         .maxlen         =       sizeof(int),
3979                         .mode           =       0644,
3980                         .proc_handler   =       &proc_dointvec,
3981                 },
3982                 {
3983                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3984                         .procname       =       "router_probe_interval",
3985                         .data           =       &ipv6_devconf.rtr_probe_interval,
3986                         .maxlen         =       sizeof(int),
3987                         .mode           =       0644,
3988                         .proc_handler   =       &proc_dointvec_jiffies,
3989                         .strategy       =       &sysctl_jiffies,
3990                 },
3991 #ifdef CONFIG_IPV6_ROUTE_INFO
3992                 {
3993                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3994                         .procname       =       "accept_ra_rt_info_max_plen",
3995                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3996                         .maxlen         =       sizeof(int),
3997                         .mode           =       0644,
3998                         .proc_handler   =       &proc_dointvec,
3999                 },
4000 #endif
4001 #endif
4002                 {
4003                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4004                         .procname       =       "proxy_ndp",
4005                         .data           =       &ipv6_devconf.proxy_ndp,
4006                         .maxlen         =       sizeof(int),
4007                         .mode           =       0644,
4008                         .proc_handler   =       &proc_dointvec,
4009                 },
4010                 {
4011                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4012                         .procname       =       "accept_source_route",
4013                         .data           =       &ipv6_devconf.accept_source_route,
4014                         .maxlen         =       sizeof(int),
4015                         .mode           =       0644,
4016                         .proc_handler   =       &proc_dointvec,
4017                 },
4018 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4019                 {
4020                         .ctl_name       =       CTL_UNNUMBERED,
4021                         .procname       =       "optimistic_dad",
4022                         .data           =       &ipv6_devconf.optimistic_dad,
4023                         .maxlen         =       sizeof(int),
4024                         .mode           =       0644,
4025                         .proc_handler   =       &proc_dointvec,
4026
4027                 },
4028 #endif
4029                 {
4030                         .ctl_name       =       0,      /* sentinel */
4031                 }
4032         },
4033         .addrconf_dev = {
4034                 {
4035                         .ctl_name       =       NET_PROTO_CONF_ALL,
4036                         .procname       =       "all",
4037                         .mode           =       0555,
4038                         .child          =       addrconf_sysctl.addrconf_vars,
4039                 },
4040                 {
4041                         .ctl_name       =       0,      /* sentinel */
4042                 }
4043         },
4044         .addrconf_conf_dir = {
4045                 {
4046                         .ctl_name       =       NET_IPV6_CONF,
4047                         .procname       =       "conf",
4048                         .mode           =       0555,
4049                         .child          =       addrconf_sysctl.addrconf_dev,
4050                 },
4051                 {
4052                         .ctl_name       =       0,      /* sentinel */
4053                 }
4054         },
4055         .addrconf_proto_dir = {
4056                 {
4057                         .ctl_name       =       NET_IPV6,
4058                         .procname       =       "ipv6",
4059                         .mode           =       0555,
4060                         .child          =       addrconf_sysctl.addrconf_conf_dir,
4061                 },
4062                 {
4063                         .ctl_name       =       0,      /* sentinel */
4064                 }
4065         },
4066         .addrconf_root_dir = {
4067                 {
4068                         .ctl_name       =       CTL_NET,
4069                         .procname       =       "net",
4070                         .mode           =       0555,
4071                         .child          =       addrconf_sysctl.addrconf_proto_dir,
4072                 },
4073                 {
4074                         .ctl_name       =       0,      /* sentinel */
4075                 }
4076         },
4077 };
4078
4079 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4080 {
4081         int i;
4082         struct net_device *dev = idev ? idev->dev : NULL;
4083         struct addrconf_sysctl_table *t;
4084         char *dev_name = NULL;
4085
4086         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4087         if (t == NULL)
4088                 return;
4089         for (i=0; t->addrconf_vars[i].data; i++) {
4090                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4091                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4092         }
4093         if (dev) {
4094                 dev_name = dev->name;
4095                 t->addrconf_dev[0].ctl_name = dev->ifindex;
4096         } else {
4097                 dev_name = "default";
4098                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4099         }
4100
4101         /*
4102          * Make a copy of dev_name, because '.procname' is regarded as const
4103          * by sysctl and we wouldn't want anyone to change it under our feet
4104          * (see SIOCSIFNAME).
4105          */
4106         dev_name = kstrdup(dev_name, GFP_KERNEL);
4107         if (!dev_name)
4108             goto free;
4109
4110         t->addrconf_dev[0].procname = dev_name;
4111
4112         t->addrconf_dev[0].child = t->addrconf_vars;
4113         t->addrconf_conf_dir[0].child = t->addrconf_dev;
4114         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4115         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4116
4117         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4118         if (t->sysctl_header == NULL)
4119                 goto free_procname;
4120         else
4121                 p->sysctl = t;
4122         return;
4123
4124         /* error path */
4125  free_procname:
4126         kfree(dev_name);
4127  free:
4128         kfree(t);
4129
4130         return;
4131 }
4132
4133 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4134 {
4135         if (p->sysctl) {
4136                 struct addrconf_sysctl_table *t = p->sysctl;
4137                 p->sysctl = NULL;
4138                 unregister_sysctl_table(t->sysctl_header);
4139                 kfree(t->addrconf_dev[0].procname);
4140                 kfree(t);
4141         }
4142 }
4143
4144
4145 #endif
4146
4147 /*
4148  *      Device notifier
4149  */
4150
4151 int register_inet6addr_notifier(struct notifier_block *nb)
4152 {
4153         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4154 }
4155
4156 EXPORT_SYMBOL(register_inet6addr_notifier);
4157
4158 int unregister_inet6addr_notifier(struct notifier_block *nb)
4159 {
4160         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4161 }
4162
4163 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4164
4165 /*
4166  *      Init / cleanup code
4167  */
4168
4169 int __init addrconf_init(void)
4170 {
4171         int err = 0;
4172
4173         /* The addrconf netdev notifier requires that loopback_dev
4174          * has it's ipv6 private information allocated and setup
4175          * before it can bring up and give link-local addresses
4176          * to other devices which are up.
4177          *
4178          * Unfortunately, loopback_dev is not necessarily the first
4179          * entry in the global dev_base list of net devices.  In fact,
4180          * it is likely to be the very last entry on that list.
4181          * So this causes the notifier registry below to try and
4182          * give link-local addresses to all devices besides loopback_dev
4183          * first, then loopback_dev, which cases all the non-loopback_dev
4184          * devices to fail to get a link-local address.
4185          *
4186          * So, as a temporary fix, allocate the ipv6 structure for
4187          * loopback_dev first by hand.
4188          * Longer term, all of the dependencies ipv6 has upon the loopback
4189          * device and it being up should be removed.
4190          */
4191         rtnl_lock();
4192         if (!ipv6_add_dev(&loopback_dev))
4193                 err = -ENOMEM;
4194         rtnl_unlock();
4195         if (err)
4196                 return err;
4197
4198         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4199
4200         register_netdevice_notifier(&ipv6_dev_notf);
4201
4202         addrconf_verify(0);
4203
4204         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4205         if (err < 0)
4206                 goto errout;
4207
4208         /* Only the first call to __rtnl_register can fail */
4209         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4210         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4211         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4212         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4213         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4214
4215 #ifdef CONFIG_SYSCTL
4216         addrconf_sysctl.sysctl_header =
4217                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4218         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4219 #endif
4220
4221         return 0;
4222 errout:
4223         unregister_netdevice_notifier(&ipv6_dev_notf);
4224
4225         return err;
4226 }
4227
4228 void __exit addrconf_cleanup(void)
4229 {
4230         struct net_device *dev;
4231         struct inet6_dev *idev;
4232         struct inet6_ifaddr *ifa;
4233         int i;
4234
4235         unregister_netdevice_notifier(&ipv6_dev_notf);
4236
4237 #ifdef CONFIG_SYSCTL
4238         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4239         addrconf_sysctl_unregister(&ipv6_devconf);
4240 #endif
4241
4242         rtnl_lock();
4243
4244         /*
4245          *      clean dev list.
4246          */
4247
4248         for (dev=dev_base; dev; dev=dev->next) {
4249                 if ((idev = __in6_dev_get(dev)) == NULL)
4250                         continue;
4251                 addrconf_ifdown(dev, 1);
4252         }
4253         addrconf_ifdown(&loopback_dev, 2);
4254
4255         /*
4256          *      Check hash table.
4257          */
4258
4259         write_lock_bh(&addrconf_hash_lock);
4260         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4261                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4262                         struct inet6_ifaddr *bifa;
4263
4264                         bifa = ifa;
4265                         ifa = ifa->lst_next;
4266                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4267                         /* Do not free it; something is wrong.
4268                            Now we can investigate it with debugger.
4269                          */
4270                 }
4271         }
4272         write_unlock_bh(&addrconf_hash_lock);
4273
4274         del_timer(&addr_chk_timer);
4275
4276         rtnl_unlock();
4277
4278 #ifdef CONFIG_PROC_FS
4279         proc_net_remove("if_inet6");
4280 #endif
4281 }