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   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/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <asm/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90
  91 /* Set to 3 to get tracing... */
  92 #define ACONF_DEBUG 2
  93
  94 #if ACONF_DEBUG >= 3
  95 #define ADBG(x) printk x
  96 #else
  97 #define ADBG(x)
  98 #endif
  99
 100 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 102
 103 #ifdef CONFIG_SYSCTL
 104 static void addrconf_sysctl_register(struct inet6_dev *idev);
 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 106 #else
 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 108 {
 109 }
 110
 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 112 {
 113 }
 114 #endif
 115
 116 #ifdef CONFIG_IPV6_PRIVACY
 117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 119 static void ipv6_regen_rndid(unsigned long data);
 120
 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 122 #endif
 123
 124 static int ipv6_count_addresses(struct inet6_dev *idev);
 125
 126 /*
 127  *      Configured unicast address hash table
 128  */
 129 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 130 static DEFINE_RWLOCK(addrconf_hash_lock);
 131
 132 static void addrconf_verify(unsigned long);
 133
 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 135 static DEFINE_SPINLOCK(addrconf_verify_lock);
 136
 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 139
 140 static int addrconf_ifdown(struct net_device *dev, int how);
 141
 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 143 static void addrconf_dad_timer(unsigned long data);
 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 145 static void addrconf_dad_run(struct inet6_dev *idev);
 146 static void addrconf_rs_timer(unsigned long data);
 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 149
 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 151                                 struct prefix_info *pinfo);
 152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 153                               struct net_device *dev);
 154
 155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 156
 157 struct ipv6_devconf ipv6_devconf __read_mostly = {
 158         .forwarding             = 0,
 159         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 160         .mtu6                   = IPV6_MIN_MTU,
 161         .accept_ra              = 1,
 162         .accept_redirects       = 1,
 163         .autoconf               = 1,
 164         .force_mld_version      = 0,
 165         .dad_transmits          = 1,
 166         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 167         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 168         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 169 #ifdef CONFIG_IPV6_PRIVACY
 170         .use_tempaddr           = 0,
 171         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 172         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 173         .regen_max_retry        = REGEN_MAX_RETRY,
 174         .max_desync_factor      = MAX_DESYNC_FACTOR,
 175 #endif
 176         .max_addresses          = IPV6_MAX_ADDRESSES,
 177         .accept_ra_defrtr       = 1,
 178         .accept_ra_pinfo        = 1,
 179 #ifdef CONFIG_IPV6_ROUTER_PREF
 180         .accept_ra_rtr_pref     = 1,
 181         .rtr_probe_interval     = 60 * HZ,
 182 #ifdef CONFIG_IPV6_ROUTE_INFO
 183         .accept_ra_rt_info_max_plen = 0,
 184 #endif
 185 #endif
 186         .proxy_ndp              = 0,
 187         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 188 };
 189
 190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 191         .forwarding             = 0,
 192         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 193         .mtu6                   = IPV6_MIN_MTU,
 194         .accept_ra              = 1,
 195         .accept_redirects       = 1,
 196         .autoconf               = 1,
 197         .dad_transmits          = 1,
 198         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 199         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 200         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 201 #ifdef CONFIG_IPV6_PRIVACY
 202         .use_tempaddr           = 0,
 203         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 204         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 205         .regen_max_retry        = REGEN_MAX_RETRY,
 206         .max_desync_factor      = MAX_DESYNC_FACTOR,
 207 #endif
 208         .max_addresses          = IPV6_MAX_ADDRESSES,
 209         .accept_ra_defrtr       = 1,
 210         .accept_ra_pinfo        = 1,
 211 #ifdef CONFIG_IPV6_ROUTER_PREF
 212         .accept_ra_rtr_pref     = 1,
 213         .rtr_probe_interval     = 60 * HZ,
 214 #ifdef CONFIG_IPV6_ROUTE_INFO
 215         .accept_ra_rt_info_max_plen = 0,
 216 #endif
 217 #endif
 218         .proxy_ndp              = 0,
 219         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 220 };
 221
 222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 225
 226 /* Check if a valid qdisc is available */
 227 static inline int addrconf_qdisc_ok(struct net_device *dev)
 228 {
 229         return (dev->qdisc != &noop_qdisc);
 230 }
 231
 232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 233 {
 234         if (del_timer(&ifp->timer))
 235                 __in6_ifa_put(ifp);
 236 }
 237
 238 enum addrconf_timer_t
 239 {
 240         AC_NONE,
 241         AC_DAD,
 242         AC_RS,
 243 };
 244
 245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 246                                enum addrconf_timer_t what,
 247                                unsigned long when)
 248 {
 249         if (!del_timer(&ifp->timer))
 250                 in6_ifa_hold(ifp);
 251
 252         switch (what) {
 253         case AC_DAD:
 254                 ifp->timer.function = addrconf_dad_timer;
 255                 break;
 256         case AC_RS:
 257                 ifp->timer.function = addrconf_rs_timer;
 258                 break;
 259         default:;
 260         }
 261         ifp->timer.expires = jiffies + when;
 262         add_timer(&ifp->timer);
 263 }
 264
 265 static int snmp6_alloc_dev(struct inet6_dev *idev)
 266 {
 267         if (snmp_mib_init((void **)idev->stats.ipv6,
 268                           sizeof(struct ipstats_mib)) < 0)
 269                 goto err_ip;
 270         if (snmp_mib_init((void **)idev->stats.icmpv6,
 271                           sizeof(struct icmpv6_mib)) < 0)
 272                 goto err_icmp;
 273         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 274                           sizeof(struct icmpv6msg_mib)) < 0)
 275                 goto err_icmpmsg;
 276
 277         return 0;
 278
 279 err_icmpmsg:
 280         snmp_mib_free((void **)idev->stats.icmpv6);
 281 err_icmp:
 282         snmp_mib_free((void **)idev->stats.ipv6);
 283 err_ip:
 284         return -ENOMEM;
 285 }
 286
 287 static void snmp6_free_dev(struct inet6_dev *idev)
 288 {
 289         snmp_mib_free((void **)idev->stats.icmpv6msg);
 290         snmp_mib_free((void **)idev->stats.icmpv6);
 291         snmp_mib_free((void **)idev->stats.ipv6);
 292 }
 293
 294 /* Nobody refers to this device, we may destroy it. */
 295
 296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 297 {
 298         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 299         kfree(idev);
 300 }
 301
 302 void in6_dev_finish_destroy(struct inet6_dev *idev)
 303 {
 304         struct net_device *dev = idev->dev;
 305         BUG_TRAP(idev->addr_list==NULL);
 306         BUG_TRAP(idev->mc_list==NULL);
 307 #ifdef NET_REFCNT_DEBUG
 308         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 309 #endif
 310         dev_put(dev);
 311         if (!idev->dead) {
 312                 printk("Freeing alive inet6 device %p\n", idev);
 313                 return;
 314         }
 315         snmp6_free_dev(idev);
 316         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 317 }
 318
 319 EXPORT_SYMBOL(in6_dev_finish_destroy);
 320
 321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 322 {
 323         struct inet6_dev *ndev;
 324         struct in6_addr maddr;
 325
 326         ASSERT_RTNL();
 327
 328         if (dev->mtu < IPV6_MIN_MTU)
 329                 return NULL;
 330
 331         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 332
 333         if (ndev == NULL)
 334                 return NULL;
 335
 336         rwlock_init(&ndev->lock);
 337         ndev->dev = dev;
 338         memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
 339         ndev->cnf.mtu6 = dev->mtu;
 340         ndev->cnf.sysctl = NULL;
 341         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 342         if (ndev->nd_parms == NULL) {
 343                 kfree(ndev);
 344                 return NULL;
 345         }
 346         /* We refer to the device */
 347         dev_hold(dev);
 348
 349         if (snmp6_alloc_dev(ndev) < 0) {
 350                 ADBG((KERN_WARNING
 351                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 352                         __FUNCTION__, dev->name));
 353                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 354                 ndev->dead = 1;
 355                 in6_dev_finish_destroy(ndev);
 356                 return NULL;
 357         }
 358
 359         if (snmp6_register_dev(ndev) < 0) {
 360                 ADBG((KERN_WARNING
 361                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 362                         __FUNCTION__, dev->name));
 363                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 364                 ndev->dead = 1;
 365                 in6_dev_finish_destroy(ndev);
 366                 return NULL;
 367         }
 368
 369         /* One reference from device.  We must do this before
 370          * we invoke __ipv6_regen_rndid().
 371          */
 372         in6_dev_hold(ndev);
 373
 374 #ifdef CONFIG_IPV6_PRIVACY
 375         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 376         if ((dev->flags&IFF_LOOPBACK) ||
 377             dev->type == ARPHRD_TUNNEL ||
 378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 379             dev->type == ARPHRD_SIT ||
 380 #endif
 381             dev->type == ARPHRD_NONE) {
 382                 printk(KERN_INFO
 383                        "%s: Disabled Privacy Extensions\n",
 384                        dev->name);
 385                 ndev->cnf.use_tempaddr = -1;
 386
 387                 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 388                         printk(KERN_INFO
 389                                "%s: Disabled Multicast RS\n",
 390                                dev->name);
 391                         ndev->cnf.rtr_solicits = 0;
 392                 }
 393         } else {
 394                 in6_dev_hold(ndev);
 395                 ipv6_regen_rndid((unsigned long) ndev);
 396         }
 397 #endif
 398
 399         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 400                 ndev->if_flags |= IF_READY;
 401
 402         ipv6_mc_init_dev(ndev);
 403         ndev->tstamp = jiffies;
 404         addrconf_sysctl_register(ndev);
 405         /* protected by rtnl_lock */
 406         rcu_assign_pointer(dev->ip6_ptr, ndev);
 407
 408         /* Join all-node multicast group */
 409         ipv6_addr_all_nodes(&maddr);
 410         ipv6_dev_mc_inc(dev, &maddr);
 411
 412         return ndev;
 413 }
 414
 415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 416 {
 417         struct inet6_dev *idev;
 418
 419         ASSERT_RTNL();
 420
 421         if ((idev = __in6_dev_get(dev)) == NULL) {
 422                 if ((idev = ipv6_add_dev(dev)) == NULL)
 423                         return NULL;
 424         }
 425
 426         if (dev->flags&IFF_UP)
 427                 ipv6_mc_up(idev);
 428         return idev;
 429 }
 430
 431 #ifdef CONFIG_SYSCTL
 432 static void dev_forward_change(struct inet6_dev *idev)
 433 {
 434         struct net_device *dev;
 435         struct inet6_ifaddr *ifa;
 436         struct in6_addr addr;
 437
 438         if (!idev)
 439                 return;
 440         dev = idev->dev;
 441         if (dev && (dev->flags & IFF_MULTICAST)) {
 442                 ipv6_addr_all_routers(&addr);
 443
 444                 if (idev->cnf.forwarding)
 445                         ipv6_dev_mc_inc(dev, &addr);
 446                 else
 447                         ipv6_dev_mc_dec(dev, &addr);
 448         }
 449         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 450                 if (ifa->flags&IFA_F_TENTATIVE)
 451                         continue;
 452                 if (idev->cnf.forwarding)
 453                         addrconf_join_anycast(ifa);
 454                 else
 455                         addrconf_leave_anycast(ifa);
 456         }
 457 }
 458
 459
 460 static void addrconf_forward_change(struct net *net, __s32 newf)
 461 {
 462         struct net_device *dev;
 463         struct inet6_dev *idev;
 464
 465         read_lock(&dev_base_lock);
 466         for_each_netdev(net, dev) {
 467                 rcu_read_lock();
 468                 idev = __in6_dev_get(dev);
 469                 if (idev) {
 470                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 471                         idev->cnf.forwarding = newf;
 472                         if (changed)
 473                                 dev_forward_change(idev);
 474                 }
 475                 rcu_read_unlock();
 476         }
 477         read_unlock(&dev_base_lock);
 478 }
 479
 480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 481 {
 482         struct net *net;
 483
 484         net = (struct net *)table->extra2;
 485         if (p == &net->ipv6.devconf_dflt->forwarding)
 486                 return;
 487
 488         if (p == &net->ipv6.devconf_all->forwarding) {
 489                 __s32 newf = net->ipv6.devconf_all->forwarding;
 490                 net->ipv6.devconf_dflt->forwarding = newf;
 491                 addrconf_forward_change(net, newf);
 492         } else if ((!*p) ^ (!old))
 493                 dev_forward_change((struct inet6_dev *)table->extra1);
 494
 495         if (*p)
 496                 rt6_purge_dflt_routers();
 497 }
 498 #endif
 499
 500 /* Nobody refers to this ifaddr, destroy it */
 501
 502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 503 {
 504         BUG_TRAP(ifp->if_next==NULL);
 505         BUG_TRAP(ifp->lst_next==NULL);
 506 #ifdef NET_REFCNT_DEBUG
 507         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 508 #endif
 509
 510         in6_dev_put(ifp->idev);
 511
 512         if (del_timer(&ifp->timer))
 513                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 514
 515         if (!ifp->dead) {
 516                 printk("Freeing alive inet6 address %p\n", ifp);
 517                 return;
 518         }
 519         dst_release(&ifp->rt->u.dst);
 520
 521         kfree(ifp);
 522 }
 523
 524 static void
 525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 526 {
 527         struct inet6_ifaddr *ifa, **ifap;
 528         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 529
 530         /*
 531          * Each device address list is sorted in order of scope -
 532          * global before linklocal.
 533          */
 534         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 535              ifap = &ifa->if_next) {
 536                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 537                         break;
 538         }
 539
 540         ifp->if_next = *ifap;
 541         *ifap = ifp;
 542 }
 543
 544 /* On success it returns ifp with increased reference count */
 545
 546 static struct inet6_ifaddr *
 547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 548               int scope, u32 flags)
 549 {
 550         struct inet6_ifaddr *ifa = NULL;
 551         struct rt6_info *rt;
 552         int hash;
 553         int err = 0;
 554
 555         rcu_read_lock_bh();
 556         if (idev->dead) {
 557                 err = -ENODEV;                  /*XXX*/
 558                 goto out2;
 559         }
 560
 561         write_lock(&addrconf_hash_lock);
 562
 563         /* Ignore adding duplicate addresses on an interface */
 564         if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
 565                 ADBG(("ipv6_add_addr: already assigned\n"));
 566                 err = -EEXIST;
 567                 goto out;
 568         }
 569
 570         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 571
 572         if (ifa == NULL) {
 573                 ADBG(("ipv6_add_addr: malloc failed\n"));
 574                 err = -ENOBUFS;
 575                 goto out;
 576         }
 577
 578         rt = addrconf_dst_alloc(idev, addr, 0);
 579         if (IS_ERR(rt)) {
 580                 err = PTR_ERR(rt);
 581                 goto out;
 582         }
 583
 584         ipv6_addr_copy(&ifa->addr, addr);
 585
 586         spin_lock_init(&ifa->lock);
 587         init_timer(&ifa->timer);
 588         ifa->timer.data = (unsigned long) ifa;
 589         ifa->scope = scope;
 590         ifa->prefix_len = pfxlen;
 591         ifa->flags = flags | IFA_F_TENTATIVE;
 592         ifa->cstamp = ifa->tstamp = jiffies;
 593
 594         ifa->rt = rt;
 595
 596         /*
 597          * part one of RFC 4429, section 3.3
 598          * We should not configure an address as
 599          * optimistic if we do not yet know the link
 600          * layer address of our nexhop router
 601          */
 602
 603         if (rt->rt6i_nexthop == NULL)
 604                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 605
 606         ifa->idev = idev;
 607         in6_dev_hold(idev);
 608         /* For caller */
 609         in6_ifa_hold(ifa);
 610
 611         /* Add to big hash table */
 612         hash = ipv6_addr_hash(addr);
 613
 614         ifa->lst_next = inet6_addr_lst[hash];
 615         inet6_addr_lst[hash] = ifa;
 616         in6_ifa_hold(ifa);
 617         write_unlock(&addrconf_hash_lock);
 618
 619         write_lock(&idev->lock);
 620         /* Add to inet6_dev unicast addr list. */
 621         ipv6_link_dev_addr(idev, ifa);
 622
 623 #ifdef CONFIG_IPV6_PRIVACY
 624         if (ifa->flags&IFA_F_TEMPORARY) {
 625                 ifa->tmp_next = idev->tempaddr_list;
 626                 idev->tempaddr_list = ifa;
 627                 in6_ifa_hold(ifa);
 628         }
 629 #endif
 630
 631         in6_ifa_hold(ifa);
 632         write_unlock(&idev->lock);
 633 out2:
 634         rcu_read_unlock_bh();
 635
 636         if (likely(err == 0))
 637                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 638         else {
 639                 kfree(ifa);
 640                 ifa = ERR_PTR(err);
 641         }
 642
 643         return ifa;
 644 out:
 645         write_unlock(&addrconf_hash_lock);
 646         goto out2;
 647 }
 648
 649 /* This function wants to get referenced ifp and releases it before return */
 650
 651 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 652 {
 653         struct inet6_ifaddr *ifa, **ifap;
 654         struct inet6_dev *idev = ifp->idev;
 655         int hash;
 656         int deleted = 0, onlink = 0;
 657         unsigned long expires = jiffies;
 658
 659         hash = ipv6_addr_hash(&ifp->addr);
 660
 661         ifp->dead = 1;
 662
 663         write_lock_bh(&addrconf_hash_lock);
 664         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 665              ifap = &ifa->lst_next) {
 666                 if (ifa == ifp) {
 667                         *ifap = ifa->lst_next;
 668                         __in6_ifa_put(ifp);
 669                         ifa->lst_next = NULL;
 670                         break;
 671                 }
 672         }
 673         write_unlock_bh(&addrconf_hash_lock);
 674
 675         write_lock_bh(&idev->lock);
 676 #ifdef CONFIG_IPV6_PRIVACY
 677         if (ifp->flags&IFA_F_TEMPORARY) {
 678                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 679                      ifap = &ifa->tmp_next) {
 680                         if (ifa == ifp) {
 681                                 *ifap = ifa->tmp_next;
 682                                 if (ifp->ifpub) {
 683                                         in6_ifa_put(ifp->ifpub);
 684                                         ifp->ifpub = NULL;
 685                                 }
 686                                 __in6_ifa_put(ifp);
 687                                 ifa->tmp_next = NULL;
 688                                 break;
 689                         }
 690                 }
 691         }
 692 #endif
 693
 694         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 695                 if (ifa == ifp) {
 696                         *ifap = ifa->if_next;
 697                         __in6_ifa_put(ifp);
 698                         ifa->if_next = NULL;
 699                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 700                                 break;
 701                         deleted = 1;
 702                         continue;
 703                 } else if (ifp->flags & IFA_F_PERMANENT) {
 704                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 705                                               ifp->prefix_len)) {
 706                                 if (ifa->flags & IFA_F_PERMANENT) {
 707                                         onlink = 1;
 708                                         if (deleted)
 709                                                 break;
 710                                 } else {
 711                                         unsigned long lifetime;
 712
 713                                         if (!onlink)
 714                                                 onlink = -1;
 715
 716                                         spin_lock(&ifa->lock);
 717                                         lifetime = min_t(unsigned long,
 718                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 719                                         if (time_before(expires,
 720                                                         ifa->tstamp + lifetime * HZ))
 721                                                 expires = ifa->tstamp + lifetime * HZ;
 722                                         spin_unlock(&ifa->lock);
 723                                 }
 724                         }
 725                 }
 726                 ifap = &ifa->if_next;
 727         }
 728         write_unlock_bh(&idev->lock);
 729
 730         ipv6_ifa_notify(RTM_DELADDR, ifp);
 731
 732         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 733
 734         addrconf_del_timer(ifp);
 735
 736         /*
 737          * Purge or update corresponding prefix
 738          *
 739          * 1) we don't purge prefix here if address was not permanent.
 740          *    prefix is managed by its own lifetime.
 741          * 2) if there're no addresses, delete prefix.
 742          * 3) if there're still other permanent address(es),
 743          *    corresponding prefix is still permanent.
 744          * 4) otherwise, update prefix lifetime to the
 745          *    longest valid lifetime among the corresponding
 746          *    addresses on the device.
 747          *    Note: subsequent RA will update lifetime.
 748          *
 749          * --yoshfuji
 750          */
 751         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 752                 struct in6_addr prefix;
 753                 struct rt6_info *rt;
 754
 755                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 756                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 757
 758                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 759                         if (onlink == 0) {
 760                                 ip6_del_rt(rt);
 761                                 rt = NULL;
 762                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 763                                 rt->rt6i_expires = expires;
 764                                 rt->rt6i_flags |= RTF_EXPIRES;
 765                         }
 766                 }
 767                 dst_release(&rt->u.dst);
 768         }
 769
 770         in6_ifa_put(ifp);
 771 }
 772
 773 #ifdef CONFIG_IPV6_PRIVACY
 774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 775 {
 776         struct inet6_dev *idev = ifp->idev;
 777         struct in6_addr addr, *tmpaddr;
 778         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 779         int tmp_plen;
 780         int ret = 0;
 781         int max_addresses;
 782         u32 addr_flags;
 783
 784         write_lock(&idev->lock);
 785         if (ift) {
 786                 spin_lock_bh(&ift->lock);
 787                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 788                 spin_unlock_bh(&ift->lock);
 789                 tmpaddr = &addr;
 790         } else {
 791                 tmpaddr = NULL;
 792         }
 793 retry:
 794         in6_dev_hold(idev);
 795         if (idev->cnf.use_tempaddr <= 0) {
 796                 write_unlock(&idev->lock);
 797                 printk(KERN_INFO
 798                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 799                 in6_dev_put(idev);
 800                 ret = -1;
 801                 goto out;
 802         }
 803         spin_lock_bh(&ifp->lock);
 804         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 805                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 806                 spin_unlock_bh(&ifp->lock);
 807                 write_unlock(&idev->lock);
 808                 printk(KERN_WARNING
 809                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 810                 in6_dev_put(idev);
 811                 ret = -1;
 812                 goto out;
 813         }
 814         in6_ifa_hold(ifp);
 815         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 816         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 817                 spin_unlock_bh(&ifp->lock);
 818                 write_unlock(&idev->lock);
 819                 printk(KERN_WARNING
 820                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 821                 in6_ifa_put(ifp);
 822                 in6_dev_put(idev);
 823                 ret = -1;
 824                 goto out;
 825         }
 826         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 827         tmp_valid_lft = min_t(__u32,
 828                               ifp->valid_lft,
 829                               idev->cnf.temp_valid_lft);
 830         tmp_prefered_lft = min_t(__u32,
 831                                  ifp->prefered_lft,
 832                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 833         tmp_plen = ifp->prefix_len;
 834         max_addresses = idev->cnf.max_addresses;
 835         tmp_cstamp = ifp->cstamp;
 836         tmp_tstamp = ifp->tstamp;
 837         spin_unlock_bh(&ifp->lock);
 838
 839         write_unlock(&idev->lock);
 840
 841         addr_flags = IFA_F_TEMPORARY;
 842         /* set in addrconf_prefix_rcv() */
 843         if (ifp->flags & IFA_F_OPTIMISTIC)
 844                 addr_flags |= IFA_F_OPTIMISTIC;
 845
 846         ift = !max_addresses ||
 847               ipv6_count_addresses(idev) < max_addresses ?
 848                 ipv6_add_addr(idev, &addr, tmp_plen,
 849                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 850                               addr_flags) : NULL;
 851         if (!ift || IS_ERR(ift)) {
 852                 in6_ifa_put(ifp);
 853                 in6_dev_put(idev);
 854                 printk(KERN_INFO
 855                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 856                 tmpaddr = &addr;
 857                 write_lock(&idev->lock);
 858                 goto retry;
 859         }
 860
 861         spin_lock_bh(&ift->lock);
 862         ift->ifpub = ifp;
 863         ift->valid_lft = tmp_valid_lft;
 864         ift->prefered_lft = tmp_prefered_lft;
 865         ift->cstamp = tmp_cstamp;
 866         ift->tstamp = tmp_tstamp;
 867         spin_unlock_bh(&ift->lock);
 868
 869         addrconf_dad_start(ift, 0);
 870         in6_ifa_put(ift);
 871         in6_dev_put(idev);
 872 out:
 873         return ret;
 874 }
 875 #endif
 876
 877 /*
 878  *      Choose an appropriate source address (RFC3484)
 879  */
 880 struct ipv6_saddr_score {
 881         int             addr_type;
 882         unsigned int    attrs;
 883         int             matchlen;
 884         int             scope;
 885         unsigned int    rule;
 886 };
 887
 888 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 889 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 890 #define IPV6_SADDR_SCORE_HOA            0x0008
 891 #define IPV6_SADDR_SCORE_OIF            0x0010
 892 #define IPV6_SADDR_SCORE_LABEL          0x0020
 893 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 894
 895 static inline int ipv6_saddr_preferred(int type)
 896 {
 897         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 898                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 899                 return 1;
 900         return 0;
 901 }
 902
 903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 904                        struct in6_addr *daddr, struct in6_addr *saddr)
 905 {
 906         struct ipv6_saddr_score hiscore;
 907         struct inet6_ifaddr *ifa_result = NULL;
 908         int daddr_type = __ipv6_addr_type(daddr);
 909         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 910         int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
 911         u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
 912         struct net_device *dev;
 913
 914         memset(&hiscore, 0, sizeof(hiscore));
 915
 916         read_lock(&dev_base_lock);
 917         rcu_read_lock();
 918
 919         for_each_netdev(&init_net, dev) {
 920                 struct inet6_dev *idev;
 921                 struct inet6_ifaddr *ifa;
 922
 923                 /* Rule 0: Candidate Source Address (section 4)
 924                  *  - multicast and link-local destination address,
 925                  *    the set of candidate source address MUST only
 926                  *    include addresses assigned to interfaces
 927                  *    belonging to the same link as the outgoing
 928                  *    interface.
 929                  * (- For site-local destination addresses, the
 930                  *    set of candidate source addresses MUST only
 931                  *    include addresses assigned to interfaces
 932                  *    belonging to the same site as the outgoing
 933                  *    interface.)
 934                  */
 935                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 936                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 937                     daddr_dev && dev != daddr_dev)
 938                         continue;
 939
 940                 idev = __in6_dev_get(dev);
 941                 if (!idev)
 942                         continue;
 943
 944                 read_lock_bh(&idev->lock);
 945                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 946                         struct ipv6_saddr_score score;
 947
 948                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 949
 950                         /* Rule 0:
 951                          * - Tentative Address (RFC2462 section 5.4)
 952                          *  - A tentative address is not considered
 953                          *    "assigned to an interface" in the traditional
 954                          *    sense, unless it is also flagged as optimistic.
 955                          * - Candidate Source Address (section 4)
 956                          *  - In any case, anycast addresses, multicast
 957                          *    addresses, and the unspecified address MUST
 958                          *    NOT be included in a candidate set.
 959                          */
 960                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 961                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 962                                 continue;
 963                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 964                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 965                                 LIMIT_NETDEBUG(KERN_DEBUG
 966                                                "ADDRCONF: unspecified / multicast address "
 967                                                "assigned as unicast address on %s",
 968                                                dev->name);
 969                                 continue;
 970                         }
 971
 972                         score.attrs = 0;
 973                         score.matchlen = 0;
 974                         score.scope = 0;
 975                         score.rule = 0;
 976
 977                         if (ifa_result == NULL) {
 978                                 /* record it if the first available entry */
 979                                 goto record_it;
 980                         }
 981
 982                         /* Rule 1: Prefer same address */
 983                         if (hiscore.rule < 1) {
 984                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 985                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 986                                 hiscore.rule++;
 987                         }
 988                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 989                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 990                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 991                                         score.rule = 1;
 992                                         goto record_it;
 993                                 }
 994                         } else {
 995                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 996                                         continue;
 997                         }
 998
 999                         /* Rule 2: Prefer appropriate scope */
1000                         if (hiscore.rule < 2) {
1001                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1002                                 hiscore.rule++;
1003                         }
1004                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1005                         if (hiscore.scope < score.scope) {
1006                                 if (hiscore.scope < daddr_scope) {
1007                                         score.rule = 2;
1008                                         goto record_it;
1009                                 } else
1010                                         continue;
1011                         } else if (score.scope < hiscore.scope) {
1012                                 if (score.scope < daddr_scope)
1013                                         break; /* addresses sorted by scope */
1014                                 else {
1015                                         score.rule = 2;
1016                                         goto record_it;
1017                                 }
1018                         }
1019
1020                         /* Rule 3: Avoid deprecated and optimistic addresses */
1021                         if (hiscore.rule < 3) {
1022                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1023                                    (((ifa_result->flags &
1024                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1025                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1026                                 hiscore.rule++;
1027                         }
1028                         if (ipv6_saddr_preferred(score.addr_type) ||
1029                            (((ifa->flags &
1030                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1031                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1033                                         score.rule = 3;
1034                                         goto record_it;
1035                                 }
1036                         } else {
1037                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1038                                         continue;
1039                         }
1040
1041                         /* Rule 4: Prefer home address */
1042 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1043                         if (hiscore.rule < 4) {
1044                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1045                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1046                                 hiscore.rule++;
1047                         }
1048                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1049                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1050                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1051                                         score.rule = 4;
1052                                         goto record_it;
1053                                 }
1054                         } else {
1055                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1056                                         continue;
1057                         }
1058 #else
1059                         if (hiscore.rule < 4)
1060                                 hiscore.rule++;
1061 #endif
1062
1063                         /* Rule 5: Prefer outgoing interface */
1064                         if (hiscore.rule < 5) {
1065                                 if (daddr_dev == NULL ||
1066                                     daddr_dev == ifa_result->idev->dev)
1067                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1068                                 hiscore.rule++;
1069                         }
1070                         if (daddr_dev == NULL ||
1071                             daddr_dev == ifa->idev->dev) {
1072                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1073                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1074                                         score.rule = 5;
1075                                         goto record_it;
1076                                 }
1077                         } else {
1078                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1079                                         continue;
1080                         }
1081
1082                         /* Rule 6: Prefer matching label */
1083                         if (hiscore.rule < 6) {
1084                                 if (ipv6_addr_label(&ifa_result->addr,
1085                                                     hiscore.addr_type,
1086                                                     ifa_result->idev->dev->ifindex) == daddr_label)
1087                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1088                                 hiscore.rule++;
1089                         }
1090                         if (ipv6_addr_label(&ifa->addr,
1091                                             score.addr_type,
1092                                             ifa->idev->dev->ifindex) == daddr_label) {
1093                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095                                         score.rule = 6;
1096                                         goto record_it;
1097                                 }
1098                         } else {
1099                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100                                         continue;
1101                         }
1102
1103 #ifdef CONFIG_IPV6_PRIVACY
1104                         /* Rule 7: Prefer public address
1105                          * Note: prefer temprary address if use_tempaddr >= 2
1106                          */
1107                         if (hiscore.rule < 7) {
1108                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1110                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111                                 hiscore.rule++;
1112                         }
1113                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1115                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117                                         score.rule = 7;
1118                                         goto record_it;
1119                                 }
1120                         } else {
1121                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122                                         continue;
1123                         }
1124 #else
1125                         if (hiscore.rule < 7)
1126                                 hiscore.rule++;
1127 #endif
1128
1129                         /* Skip rule 8 for orchid -> non-orchid address pairs. */
1130                         if (ipv6_addr_orchid(&ifa->addr) && !ipv6_addr_orchid(daddr))
1131                                 continue;
1132
1133                         /* Rule 8: Use longest matching prefix */
1134                         if (hiscore.rule < 8) {
1135                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1136                                 hiscore.rule++;
1137                         }
1138                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1139                         if (score.matchlen > hiscore.matchlen) {
1140                                 score.rule = 8;
1141                                 goto record_it;
1142                         }
1143 #if 0
1144                         else if (score.matchlen < hiscore.matchlen)
1145                                 continue;
1146 #endif
1147
1148                         /* Final Rule: choose first available one */
1149                         continue;
1150 record_it:
1151                         if (ifa_result)
1152                                 in6_ifa_put(ifa_result);
1153                         in6_ifa_hold(ifa);
1154                         ifa_result = ifa;
1155                         hiscore = score;
1156                 }
1157                 read_unlock_bh(&idev->lock);
1158         }
1159         rcu_read_unlock();
1160         read_unlock(&dev_base_lock);
1161
1162         if (!ifa_result)
1163                 return -EADDRNOTAVAIL;
1164
1165         ipv6_addr_copy(saddr, &ifa_result->addr);
1166         in6_ifa_put(ifa_result);
1167         return 0;
1168 }
1169
1170 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1171
1172 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1173                     unsigned char banned_flags)
1174 {
1175         struct inet6_dev *idev;
1176         int err = -EADDRNOTAVAIL;
1177
1178         rcu_read_lock();
1179         if ((idev = __in6_dev_get(dev)) != NULL) {
1180                 struct inet6_ifaddr *ifp;
1181
1182                 read_lock_bh(&idev->lock);
1183                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1184                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1185                                 ipv6_addr_copy(addr, &ifp->addr);
1186                                 err = 0;
1187                                 break;
1188                         }
1189                 }
1190                 read_unlock_bh(&idev->lock);
1191         }
1192         rcu_read_unlock();
1193         return err;
1194 }
1195
1196 static int ipv6_count_addresses(struct inet6_dev *idev)
1197 {
1198         int cnt = 0;
1199         struct inet6_ifaddr *ifp;
1200
1201         read_lock_bh(&idev->lock);
1202         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1203                 cnt++;
1204         read_unlock_bh(&idev->lock);
1205         return cnt;
1206 }
1207
1208 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1209                   struct net_device *dev, int strict)
1210 {
1211         struct inet6_ifaddr * ifp;
1212         u8 hash = ipv6_addr_hash(addr);
1213
1214         read_lock_bh(&addrconf_hash_lock);
1215         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1216                 if (ifp->idev->dev->nd_net != net)
1217                         continue;
1218                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1219                     !(ifp->flags&IFA_F_TENTATIVE)) {
1220                         if (dev == NULL || ifp->idev->dev == dev ||
1221                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1222                                 break;
1223                 }
1224         }
1225         read_unlock_bh(&addrconf_hash_lock);
1226         return ifp != NULL;
1227 }
1228 EXPORT_SYMBOL(ipv6_chk_addr);
1229
1230 static
1231 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1232                        struct net_device *dev)
1233 {
1234         struct inet6_ifaddr * ifp;
1235         u8 hash = ipv6_addr_hash(addr);
1236
1237         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1238                 if (ifp->idev->dev->nd_net != net)
1239                         continue;
1240                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1241                         if (dev == NULL || ifp->idev->dev == dev)
1242                                 break;
1243                 }
1244         }
1245         return ifp != NULL;
1246 }
1247
1248 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1249                                      struct net_device *dev, int strict)
1250 {
1251         struct inet6_ifaddr * ifp;
1252         u8 hash = ipv6_addr_hash(addr);
1253
1254         read_lock_bh(&addrconf_hash_lock);
1255         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1256                 if (ifp->idev->dev->nd_net != net)
1257                         continue;
1258                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1259                         if (dev == NULL || ifp->idev->dev == dev ||
1260                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1261                                 in6_ifa_hold(ifp);
1262                                 break;
1263                         }
1264                 }
1265         }
1266         read_unlock_bh(&addrconf_hash_lock);
1267
1268         return ifp;
1269 }
1270
1271 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1272 {
1273         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1274         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1275         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1276         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1277         int sk_ipv6only = ipv6_only_sock(sk);
1278         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1279         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1280         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1281
1282         if (!sk2_rcv_saddr && !sk_ipv6only)
1283                 return 1;
1284
1285         if (addr_type2 == IPV6_ADDR_ANY &&
1286             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1287                 return 1;
1288
1289         if (addr_type == IPV6_ADDR_ANY &&
1290             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1291                 return 1;
1292
1293         if (sk2_rcv_saddr6 &&
1294             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1295                 return 1;
1296
1297         if (addr_type == IPV6_ADDR_MAPPED &&
1298             !sk2_ipv6only &&
1299             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1300                 return 1;
1301
1302         return 0;
1303 }
1304
1305 /* Gets referenced address, destroys ifaddr */
1306
1307 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1308 {
1309         if (ifp->flags&IFA_F_PERMANENT) {
1310                 spin_lock_bh(&ifp->lock);
1311                 addrconf_del_timer(ifp);
1312                 ifp->flags |= IFA_F_TENTATIVE;
1313                 spin_unlock_bh(&ifp->lock);
1314                 in6_ifa_put(ifp);
1315 #ifdef CONFIG_IPV6_PRIVACY
1316         } else if (ifp->flags&IFA_F_TEMPORARY) {
1317                 struct inet6_ifaddr *ifpub;
1318                 spin_lock_bh(&ifp->lock);
1319                 ifpub = ifp->ifpub;
1320                 if (ifpub) {
1321                         in6_ifa_hold(ifpub);
1322                         spin_unlock_bh(&ifp->lock);
1323                         ipv6_create_tempaddr(ifpub, ifp);
1324                         in6_ifa_put(ifpub);
1325                 } else {
1326                         spin_unlock_bh(&ifp->lock);
1327                 }
1328                 ipv6_del_addr(ifp);
1329 #endif
1330         } else
1331                 ipv6_del_addr(ifp);
1332 }
1333
1334 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1335 {
1336         if (net_ratelimit())
1337                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1338         addrconf_dad_stop(ifp);
1339 }
1340
1341 /* Join to solicited addr multicast group. */
1342
1343 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1344 {
1345         struct in6_addr maddr;
1346
1347         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1348                 return;
1349
1350         addrconf_addr_solict_mult(addr, &maddr);
1351         ipv6_dev_mc_inc(dev, &maddr);
1352 }
1353
1354 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1355 {
1356         struct in6_addr maddr;
1357
1358         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1359                 return;
1360
1361         addrconf_addr_solict_mult(addr, &maddr);
1362         __ipv6_dev_mc_dec(idev, &maddr);
1363 }
1364
1365 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1366 {
1367         struct in6_addr addr;
1368         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1369         if (ipv6_addr_any(&addr))
1370                 return;
1371         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1372 }
1373
1374 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1375 {
1376         struct in6_addr addr;
1377         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1378         if (ipv6_addr_any(&addr))
1379                 return;
1380         __ipv6_dev_ac_dec(ifp->idev, &addr);
1381 }
1382
1383 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1384 {
1385         if (dev->addr_len != ETH_ALEN)
1386                 return -1;
1387         memcpy(eui, dev->dev_addr, 3);
1388         memcpy(eui + 5, dev->dev_addr + 3, 3);
1389
1390         /*
1391          * The zSeries OSA network cards can be shared among various
1392          * OS instances, but the OSA cards have only one MAC address.
1393          * This leads to duplicate address conflicts in conjunction
1394          * with IPv6 if more than one instance uses the same card.
1395          *
1396          * The driver for these cards can deliver a unique 16-bit
1397          * identifier for each instance sharing the same card.  It is
1398          * placed instead of 0xFFFE in the interface identifier.  The
1399          * "u" bit of the interface identifier is not inverted in this
1400          * case.  Hence the resulting interface identifier has local
1401          * scope according to RFC2373.
1402          */
1403         if (dev->dev_id) {
1404                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1405                 eui[4] = dev->dev_id & 0xFF;
1406         } else {
1407                 eui[3] = 0xFF;
1408                 eui[4] = 0xFE;
1409                 eui[0] ^= 2;
1410         }
1411         return 0;
1412 }
1413
1414 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1415 {
1416         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1417         if (dev->addr_len != ARCNET_ALEN)
1418                 return -1;
1419         memset(eui, 0, 7);
1420         eui[7] = *(u8*)dev->dev_addr;
1421         return 0;
1422 }
1423
1424 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1425 {
1426         if (dev->addr_len != INFINIBAND_ALEN)
1427                 return -1;
1428         memcpy(eui, dev->dev_addr + 12, 8);
1429         eui[0] |= 2;
1430         return 0;
1431 }
1432
1433 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1434 {
1435         switch (dev->type) {
1436         case ARPHRD_ETHER:
1437         case ARPHRD_FDDI:
1438         case ARPHRD_IEEE802_TR:
1439                 return addrconf_ifid_eui48(eui, dev);
1440         case ARPHRD_ARCNET:
1441                 return addrconf_ifid_arcnet(eui, dev);
1442         case ARPHRD_INFINIBAND:
1443                 return addrconf_ifid_infiniband(eui, dev);
1444         case ARPHRD_SIT:
1445                 if (dev->priv_flags & IFF_ISATAP)
1446                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1447         }
1448         return -1;
1449 }
1450
1451 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1452 {
1453         int err = -1;
1454         struct inet6_ifaddr *ifp;
1455
1456         read_lock_bh(&idev->lock);
1457         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1458                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1459                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1460                         err = 0;
1461                         break;
1462                 }
1463         }
1464         read_unlock_bh(&idev->lock);
1465         return err;
1466 }
1467
1468 #ifdef CONFIG_IPV6_PRIVACY
1469 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1470 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1471 {
1472 regen:
1473         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1474         idev->rndid[0] &= ~0x02;
1475
1476         /*
1477          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1478          * check if generated address is not inappropriate
1479          *
1480          *  - Reserved subnet anycast (RFC 2526)
1481          *      11111101 11....11 1xxxxxxx
1482          *  - ISATAP (RFC4214) 6.1
1483          *      00-00-5E-FE-xx-xx-xx-xx
1484          *  - value 0
1485          *  - XXX: already assigned to an address on the device
1486          */
1487         if (idev->rndid[0] == 0xfd &&
1488             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1489             (idev->rndid[7]&0x80))
1490                 goto regen;
1491         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1492                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1493                         goto regen;
1494                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1495                         goto regen;
1496         }
1497
1498         return 0;
1499 }
1500
1501 static void ipv6_regen_rndid(unsigned long data)
1502 {
1503         struct inet6_dev *idev = (struct inet6_dev *) data;
1504         unsigned long expires;
1505
1506         rcu_read_lock_bh();
1507         write_lock_bh(&idev->lock);
1508
1509         if (idev->dead)
1510                 goto out;
1511
1512         if (__ipv6_regen_rndid(idev) < 0)
1513                 goto out;
1514
1515         expires = jiffies +
1516                 idev->cnf.temp_prefered_lft * HZ -
1517                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1518         if (time_before(expires, jiffies)) {
1519                 printk(KERN_WARNING
1520                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1521                         idev->dev->name);
1522                 goto out;
1523         }
1524
1525         if (!mod_timer(&idev->regen_timer, expires))
1526                 in6_dev_hold(idev);
1527
1528 out:
1529         write_unlock_bh(&idev->lock);
1530         rcu_read_unlock_bh();
1531         in6_dev_put(idev);
1532 }
1533
1534 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1535         int ret = 0;
1536
1537         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1538                 ret = __ipv6_regen_rndid(idev);
1539         return ret;
1540 }
1541 #endif
1542
1543 /*
1544  *      Add prefix route.
1545  */
1546
1547 static void
1548 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1549                       unsigned long expires, u32 flags)
1550 {
1551         struct fib6_config cfg = {
1552                 .fc_table = RT6_TABLE_PREFIX,
1553                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1554                 .fc_ifindex = dev->ifindex,
1555                 .fc_expires = expires,
1556                 .fc_dst_len = plen,
1557                 .fc_flags = RTF_UP | flags,
1558                 .fc_nlinfo.nl_net = &init_net,
1559         };
1560
1561         ipv6_addr_copy(&cfg.fc_dst, pfx);
1562
1563         /* Prevent useless cloning on PtP SIT.
1564            This thing is done here expecting that the whole
1565            class of non-broadcast devices need not cloning.
1566          */
1567 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1568         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1569                 cfg.fc_flags |= RTF_NONEXTHOP;
1570 #endif
1571
1572         ip6_route_add(&cfg);
1573 }
1574
1575 /* Create "default" multicast route to the interface */
1576
1577 static void addrconf_add_mroute(struct net_device *dev)
1578 {
1579         struct fib6_config cfg = {
1580                 .fc_table = RT6_TABLE_LOCAL,
1581                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1582                 .fc_ifindex = dev->ifindex,
1583                 .fc_dst_len = 8,
1584                 .fc_flags = RTF_UP,
1585                 .fc_nlinfo.nl_net = &init_net,
1586         };
1587
1588         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1589
1590         ip6_route_add(&cfg);
1591 }
1592
1593 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1594 static void sit_route_add(struct net_device *dev)
1595 {
1596         struct fib6_config cfg = {
1597                 .fc_table = RT6_TABLE_MAIN,
1598                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1599                 .fc_ifindex = dev->ifindex,
1600                 .fc_dst_len = 96,
1601                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1602                 .fc_nlinfo.nl_net = &init_net,
1603         };
1604
1605         /* prefix length - 96 bits "::d.d.d.d" */
1606         ip6_route_add(&cfg);
1607 }
1608 #endif
1609
1610 static void addrconf_add_lroute(struct net_device *dev)
1611 {
1612         struct in6_addr addr;
1613
1614         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1615         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1616 }
1617
1618 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1619 {
1620         struct inet6_dev *idev;
1621
1622         ASSERT_RTNL();
1623
1624         if ((idev = ipv6_find_idev(dev)) == NULL)
1625                 return NULL;
1626
1627         /* Add default multicast route */
1628         addrconf_add_mroute(dev);
1629
1630         /* Add link local route */
1631         addrconf_add_lroute(dev);
1632         return idev;
1633 }
1634
1635 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1636 {
1637         struct prefix_info *pinfo;
1638         __u32 valid_lft;
1639         __u32 prefered_lft;
1640         int addr_type;
1641         unsigned long rt_expires;
1642         struct inet6_dev *in6_dev;
1643
1644         pinfo = (struct prefix_info *) opt;
1645
1646         if (len < sizeof(struct prefix_info)) {
1647                 ADBG(("addrconf: prefix option too short\n"));
1648                 return;
1649         }
1650
1651         /*
1652          *      Validation checks ([ADDRCONF], page 19)
1653          */
1654
1655         addr_type = ipv6_addr_type(&pinfo->prefix);
1656
1657         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1658                 return;
1659
1660         valid_lft = ntohl(pinfo->valid);
1661         prefered_lft = ntohl(pinfo->prefered);
1662
1663         if (prefered_lft > valid_lft) {
1664                 if (net_ratelimit())
1665                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1666                 return;
1667         }
1668
1669         in6_dev = in6_dev_get(dev);
1670
1671         if (in6_dev == NULL) {
1672                 if (net_ratelimit())
1673                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1674                 return;
1675         }
1676
1677         /*
1678          *      Two things going on here:
1679          *      1) Add routes for on-link prefixes
1680          *      2) Configure prefixes with the auto flag set
1681          */
1682
1683         /* Avoid arithmetic overflow. Really, we could
1684            save rt_expires in seconds, likely valid_lft,
1685            but it would require division in fib gc, that it
1686            not good.
1687          */
1688         if (valid_lft >= 0x7FFFFFFF/HZ)
1689                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1690         else
1691                 rt_expires = valid_lft * HZ;
1692
1693         /*
1694          * We convert this (in jiffies) to clock_t later.
1695          * Avoid arithmetic overflow there as well.
1696          * Overflow can happen only if HZ < USER_HZ.
1697          */
1698         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1699                 rt_expires = 0x7FFFFFFF / USER_HZ;
1700
1701         if (pinfo->onlink) {
1702                 struct rt6_info *rt;
1703                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1704
1705                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1706                         if (rt->rt6i_flags&RTF_EXPIRES) {
1707                                 if (valid_lft == 0) {
1708                                         ip6_del_rt(rt);
1709                                         rt = NULL;
1710                                 } else {
1711                                         rt->rt6i_expires = jiffies + rt_expires;
1712                                 }
1713                         }
1714                 } else if (valid_lft) {
1715                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1716                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1717                 }
1718                 if (rt)
1719                         dst_release(&rt->u.dst);
1720         }
1721
1722         /* Try to figure out our local address for this prefix */
1723
1724         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1725                 struct inet6_ifaddr * ifp;
1726                 struct in6_addr addr;
1727                 int create = 0, update_lft = 0;
1728
1729                 if (pinfo->prefix_len == 64) {
1730                         memcpy(&addr, &pinfo->prefix, 8);
1731                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1732                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1733                                 in6_dev_put(in6_dev);
1734                                 return;
1735                         }
1736                         goto ok;
1737                 }
1738                 if (net_ratelimit())
1739                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1740                                pinfo->prefix_len);
1741                 in6_dev_put(in6_dev);
1742                 return;
1743
1744 ok:
1745
1746                 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1747
1748                 if (ifp == NULL && valid_lft) {
1749                         int max_addresses = in6_dev->cnf.max_addresses;
1750                         u32 addr_flags = 0;
1751
1752 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1753                         if (in6_dev->cnf.optimistic_dad &&
1754                             !ipv6_devconf.forwarding)
1755                                 addr_flags = IFA_F_OPTIMISTIC;
1756 #endif
1757
1758                         /* Do not allow to create too much of autoconfigured
1759                          * addresses; this would be too easy way to crash kernel.
1760                          */
1761                         if (!max_addresses ||
1762                             ipv6_count_addresses(in6_dev) < max_addresses)
1763                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1764                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1765                                                     addr_flags);
1766
1767                         if (!ifp || IS_ERR(ifp)) {
1768                                 in6_dev_put(in6_dev);
1769                                 return;
1770                         }
1771
1772                         update_lft = create = 1;
1773                         ifp->cstamp = jiffies;
1774                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1775                 }
1776
1777                 if (ifp) {
1778                         int flags;
1779                         unsigned long now;
1780 #ifdef CONFIG_IPV6_PRIVACY
1781                         struct inet6_ifaddr *ift;
1782 #endif
1783                         u32 stored_lft;
1784
1785                         /* update lifetime (RFC2462 5.5.3 e) */
1786                         spin_lock(&ifp->lock);
1787                         now = jiffies;
1788                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1789                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1790                         else
1791                                 stored_lft = 0;
1792                         if (!update_lft && stored_lft) {
1793                                 if (valid_lft > MIN_VALID_LIFETIME ||
1794                                     valid_lft > stored_lft)
1795                                         update_lft = 1;
1796                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1797                                         /* valid_lft <= stored_lft is always true */
1798                                         /* XXX: IPsec */
1799                                         update_lft = 0;
1800                                 } else {
1801                                         valid_lft = MIN_VALID_LIFETIME;
1802                                         if (valid_lft < prefered_lft)
1803                                                 prefered_lft = valid_lft;
1804                                         update_lft = 1;
1805                                 }
1806                         }
1807
1808                         if (update_lft) {
1809                                 ifp->valid_lft = valid_lft;
1810                                 ifp->prefered_lft = prefered_lft;
1811                                 ifp->tstamp = now;
1812                                 flags = ifp->flags;
1813                                 ifp->flags &= ~IFA_F_DEPRECATED;
1814                                 spin_unlock(&ifp->lock);
1815
1816                                 if (!(flags&IFA_F_TENTATIVE))
1817                                         ipv6_ifa_notify(0, ifp);
1818                         } else
1819                                 spin_unlock(&ifp->lock);
1820
1821 #ifdef CONFIG_IPV6_PRIVACY
1822                         read_lock_bh(&in6_dev->lock);
1823                         /* update all temporary addresses in the list */
1824                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1825                                 /*
1826                                  * When adjusting the lifetimes of an existing
1827                                  * temporary address, only lower the lifetimes.
1828                                  * Implementations must not increase the
1829                                  * lifetimes of an existing temporary address
1830                                  * when processing a Prefix Information Option.
1831                                  */
1832                                 spin_lock(&ift->lock);
1833                                 flags = ift->flags;
1834                                 if (ift->valid_lft > valid_lft &&
1835                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1836                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1837                                 if (ift->prefered_lft > prefered_lft &&
1838                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1839                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1840                                 spin_unlock(&ift->lock);
1841                                 if (!(flags&IFA_F_TENTATIVE))
1842                                         ipv6_ifa_notify(0, ift);
1843                         }
1844
1845                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1846                                 /*
1847                                  * When a new public address is created as described in [ADDRCONF],
1848                                  * also create a new temporary address.
1849                                  */
1850                                 read_unlock_bh(&in6_dev->lock);
1851                                 ipv6_create_tempaddr(ifp, NULL);
1852                         } else {
1853                                 read_unlock_bh(&in6_dev->lock);
1854                         }
1855 #endif
1856                         in6_ifa_put(ifp);
1857                         addrconf_verify(0);
1858                 }
1859         }
1860         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1861         in6_dev_put(in6_dev);
1862 }
1863
1864 /*
1865  *      Set destination address.
1866  *      Special case for SIT interfaces where we create a new "virtual"
1867  *      device.
1868  */
1869 int addrconf_set_dstaddr(void __user *arg)
1870 {
1871         struct in6_ifreq ireq;
1872         struct net_device *dev;
1873         int err = -EINVAL;
1874
1875         rtnl_lock();
1876
1877         err = -EFAULT;
1878         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1879                 goto err_exit;
1880
1881         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1882
1883         err = -ENODEV;
1884         if (dev == NULL)
1885                 goto err_exit;
1886
1887 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1888         if (dev->type == ARPHRD_SIT) {
1889                 struct ifreq ifr;
1890                 mm_segment_t    oldfs;
1891                 struct ip_tunnel_parm p;
1892
1893                 err = -EADDRNOTAVAIL;
1894                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1895                         goto err_exit;
1896
1897                 memset(&p, 0, sizeof(p));
1898                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1899                 p.iph.saddr = 0;
1900                 p.iph.version = 4;
1901                 p.iph.ihl = 5;
1902                 p.iph.protocol = IPPROTO_IPV6;
1903                 p.iph.ttl = 64;
1904                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1905
1906                 oldfs = get_fs(); set_fs(KERNEL_DS);
1907                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1908                 set_fs(oldfs);
1909
1910                 if (err == 0) {
1911                         err = -ENOBUFS;
1912                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1913                                 goto err_exit;
1914                         err = dev_open(dev);
1915                 }
1916         }
1917 #endif
1918
1919 err_exit:
1920         rtnl_unlock();
1921         return err;
1922 }
1923
1924 /*
1925  *      Manual configuration of address on an interface
1926  */
1927 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1928                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1929 {
1930         struct inet6_ifaddr *ifp;
1931         struct inet6_dev *idev;
1932         struct net_device *dev;
1933         int scope;
1934         u32 flags = RTF_EXPIRES;
1935
1936         ASSERT_RTNL();
1937
1938         /* check the lifetime */
1939         if (!valid_lft || prefered_lft > valid_lft)
1940                 return -EINVAL;
1941
1942         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1943                 return -ENODEV;
1944
1945         if ((idev = addrconf_add_dev(dev)) == NULL)
1946                 return -ENOBUFS;
1947
1948         scope = ipv6_addr_scope(pfx);
1949
1950         if (valid_lft == INFINITY_LIFE_TIME) {
1951                 ifa_flags |= IFA_F_PERMANENT;
1952                 flags = 0;
1953         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1954                 valid_lft = 0x7FFFFFFF/HZ;
1955
1956         if (prefered_lft == 0)
1957                 ifa_flags |= IFA_F_DEPRECATED;
1958         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1959                  (prefered_lft != INFINITY_LIFE_TIME))
1960                 prefered_lft = 0x7FFFFFFF/HZ;
1961
1962         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1963
1964         if (!IS_ERR(ifp)) {
1965                 spin_lock_bh(&ifp->lock);
1966                 ifp->valid_lft = valid_lft;
1967                 ifp->prefered_lft = prefered_lft;
1968                 ifp->tstamp = jiffies;
1969                 spin_unlock_bh(&ifp->lock);
1970
1971                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1972                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1973                 /*
1974                  * Note that section 3.1 of RFC 4429 indicates
1975                  * that the Optimistic flag should not be set for
1976                  * manually configured addresses
1977                  */
1978                 addrconf_dad_start(ifp, 0);
1979                 in6_ifa_put(ifp);
1980                 addrconf_verify(0);
1981                 return 0;
1982         }
1983
1984         return PTR_ERR(ifp);
1985 }
1986
1987 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1988 {
1989         struct inet6_ifaddr *ifp;
1990         struct inet6_dev *idev;
1991         struct net_device *dev;
1992
1993         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1994                 return -ENODEV;
1995
1996         if ((idev = __in6_dev_get(dev)) == NULL)
1997                 return -ENXIO;
1998
1999         read_lock_bh(&idev->lock);
2000         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2001                 if (ifp->prefix_len == plen &&
2002                     ipv6_addr_equal(pfx, &ifp->addr)) {
2003                         in6_ifa_hold(ifp);
2004                         read_unlock_bh(&idev->lock);
2005
2006                         ipv6_del_addr(ifp);
2007
2008                         /* If the last address is deleted administratively,
2009                            disable IPv6 on this interface.
2010                          */
2011                         if (idev->addr_list == NULL)
2012                                 addrconf_ifdown(idev->dev, 1);
2013                         return 0;
2014                 }
2015         }
2016         read_unlock_bh(&idev->lock);
2017         return -EADDRNOTAVAIL;
2018 }
2019
2020
2021 int addrconf_add_ifaddr(void __user *arg)
2022 {
2023         struct in6_ifreq ireq;
2024         int err;
2025
2026         if (!capable(CAP_NET_ADMIN))
2027                 return -EPERM;
2028
2029         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2030                 return -EFAULT;
2031
2032         rtnl_lock();
2033         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2034                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2035         rtnl_unlock();
2036         return err;
2037 }
2038
2039 int addrconf_del_ifaddr(void __user *arg)
2040 {
2041         struct in6_ifreq ireq;
2042         int err;
2043
2044         if (!capable(CAP_NET_ADMIN))
2045                 return -EPERM;
2046
2047         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2048                 return -EFAULT;
2049
2050         rtnl_lock();
2051         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2052         rtnl_unlock();
2053         return err;
2054 }
2055
2056 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2057 static void sit_add_v4_addrs(struct inet6_dev *idev)
2058 {
2059         struct inet6_ifaddr * ifp;
2060         struct in6_addr addr;
2061         struct net_device *dev;
2062         int scope;
2063
2064         ASSERT_RTNL();
2065
2066         memset(&addr, 0, sizeof(struct in6_addr));
2067         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2068
2069         if (idev->dev->flags&IFF_POINTOPOINT) {
2070                 addr.s6_addr32[0] = htonl(0xfe800000);
2071                 scope = IFA_LINK;
2072         } else {
2073                 scope = IPV6_ADDR_COMPATv4;
2074         }
2075
2076         if (addr.s6_addr32[3]) {
2077                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2078                 if (!IS_ERR(ifp)) {
2079                         spin_lock_bh(&ifp->lock);
2080                         ifp->flags &= ~IFA_F_TENTATIVE;
2081                         spin_unlock_bh(&ifp->lock);
2082                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2083                         in6_ifa_put(ifp);
2084                 }
2085                 return;
2086         }
2087
2088         for_each_netdev(&init_net, dev) {
2089                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2090                 if (in_dev && (dev->flags & IFF_UP)) {
2091                         struct in_ifaddr * ifa;
2092
2093                         int flag = scope;
2094
2095                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2096                                 int plen;
2097
2098                                 addr.s6_addr32[3] = ifa->ifa_local;
2099
2100                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2101                                         continue;
2102                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2103                                         if (idev->dev->flags&IFF_POINTOPOINT)
2104                                                 continue;
2105                                         flag |= IFA_HOST;
2106                                 }
2107                                 if (idev->dev->flags&IFF_POINTOPOINT)
2108                                         plen = 64;
2109                                 else
2110                                         plen = 96;
2111
2112                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2113                                                     IFA_F_PERMANENT);
2114                                 if (!IS_ERR(ifp)) {
2115                                         spin_lock_bh(&ifp->lock);
2116                                         ifp->flags &= ~IFA_F_TENTATIVE;
2117                                         spin_unlock_bh(&ifp->lock);
2118                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2119                                         in6_ifa_put(ifp);
2120                                 }
2121                         }
2122                 }
2123         }
2124 }
2125 #endif
2126
2127 static void init_loopback(struct net_device *dev)
2128 {
2129         struct inet6_dev  *idev;
2130         struct inet6_ifaddr * ifp;
2131
2132         /* ::1 */
2133
2134         ASSERT_RTNL();
2135
2136         if ((idev = ipv6_find_idev(dev)) == NULL) {
2137                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2138                 return;
2139         }
2140
2141         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2142         if (!IS_ERR(ifp)) {
2143                 spin_lock_bh(&ifp->lock);
2144                 ifp->flags &= ~IFA_F_TENTATIVE;
2145                 spin_unlock_bh(&ifp->lock);
2146                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2147                 in6_ifa_put(ifp);
2148         }
2149 }
2150
2151 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2152 {
2153         struct inet6_ifaddr * ifp;
2154         u32 addr_flags = IFA_F_PERMANENT;
2155
2156 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2157         if (idev->cnf.optimistic_dad &&
2158             !ipv6_devconf.forwarding)
2159                 addr_flags |= IFA_F_OPTIMISTIC;
2160 #endif
2161
2162
2163         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2164         if (!IS_ERR(ifp)) {
2165                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2166                 addrconf_dad_start(ifp, 0);
2167                 in6_ifa_put(ifp);
2168         }
2169 }
2170
2171 static void addrconf_dev_config(struct net_device *dev)
2172 {
2173         struct in6_addr addr;
2174         struct inet6_dev    * idev;
2175
2176         ASSERT_RTNL();
2177
2178         if ((dev->type != ARPHRD_ETHER) &&
2179             (dev->type != ARPHRD_FDDI) &&
2180             (dev->type != ARPHRD_IEEE802_TR) &&
2181             (dev->type != ARPHRD_ARCNET) &&
2182             (dev->type != ARPHRD_INFINIBAND)) {
2183                 /* Alas, we support only Ethernet autoconfiguration. */
2184                 return;
2185         }
2186
2187         idev = addrconf_add_dev(dev);
2188         if (idev == NULL)
2189                 return;
2190
2191         memset(&addr, 0, sizeof(struct in6_addr));
2192         addr.s6_addr32[0] = htonl(0xFE800000);
2193
2194         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2195                 addrconf_add_linklocal(idev, &addr);
2196 }
2197
2198 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2199 static void addrconf_sit_config(struct net_device *dev)
2200 {
2201         struct inet6_dev *idev;
2202
2203         ASSERT_RTNL();
2204
2205         /*
2206          * Configure the tunnel with one of our IPv4
2207          * addresses... we should configure all of
2208          * our v4 addrs in the tunnel
2209          */
2210
2211         if ((idev = ipv6_find_idev(dev)) == NULL) {
2212                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2213                 return;
2214         }
2215
2216         if (dev->priv_flags & IFF_ISATAP) {
2217                 struct in6_addr addr;
2218
2219                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2220                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2221                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2222                         addrconf_add_linklocal(idev, &addr);
2223                 return;
2224         }
2225
2226         sit_add_v4_addrs(idev);
2227
2228         if (dev->flags&IFF_POINTOPOINT) {
2229                 addrconf_add_mroute(dev);
2230                 addrconf_add_lroute(dev);
2231         } else
2232                 sit_route_add(dev);
2233 }
2234 #endif
2235
2236 static inline int
2237 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2238 {
2239         struct in6_addr lladdr;
2240
2241         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2242                 addrconf_add_linklocal(idev, &lladdr);
2243                 return 0;
2244         }
2245         return -1;
2246 }
2247
2248 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2249 {
2250         struct net_device *link_dev;
2251
2252         /* first try to inherit the link-local address from the link device */
2253         if (idev->dev->iflink &&
2254             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2255                 if (!ipv6_inherit_linklocal(idev, link_dev))
2256                         return;
2257         }
2258         /* then try to inherit it from any device */
2259         for_each_netdev(&init_net, link_dev) {
2260                 if (!ipv6_inherit_linklocal(idev, link_dev))
2261                         return;
2262         }
2263         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2264 }
2265
2266 /*
2267  * Autoconfigure tunnel with a link-local address so routing protocols,
2268  * DHCPv6, MLD etc. can be run over the virtual link
2269  */
2270
2271 static void addrconf_ip6_tnl_config(struct net_device *dev)
2272 {
2273         struct inet6_dev *idev;
2274
2275         ASSERT_RTNL();
2276
2277         if ((idev = addrconf_add_dev(dev)) == NULL) {
2278                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2279                 return;
2280         }
2281         ip6_tnl_add_linklocal(idev);
2282 }
2283
2284 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2285                            void * data)
2286 {
2287         struct net_device *dev = (struct net_device *) data;
2288         struct inet6_dev *idev = __in6_dev_get(dev);
2289         int run_pending = 0;
2290         int err;
2291
2292         if (dev->nd_net != &init_net)
2293                 return NOTIFY_DONE;
2294
2295         switch(event) {
2296         case NETDEV_REGISTER:
2297                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2298                         idev = ipv6_add_dev(dev);
2299                         if (!idev)
2300                                 return notifier_from_errno(-ENOMEM);
2301                 }
2302                 break;
2303         case NETDEV_UP:
2304         case NETDEV_CHANGE:
2305                 if (dev->flags & IFF_SLAVE)
2306                         break;
2307
2308                 if (event == NETDEV_UP) {
2309                         if (!addrconf_qdisc_ok(dev)) {
2310                                 /* device is not ready yet. */
2311                                 printk(KERN_INFO
2312                                         "ADDRCONF(NETDEV_UP): %s: "
2313                                         "link is not ready\n",
2314                                         dev->name);
2315                                 break;
2316                         }
2317
2318                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2319                                 idev = ipv6_add_dev(dev);
2320
2321                         if (idev)
2322                                 idev->if_flags |= IF_READY;
2323                 } else {
2324                         if (!addrconf_qdisc_ok(dev)) {
2325                                 /* device is still not ready. */
2326                                 break;
2327                         }
2328
2329                         if (idev) {
2330                                 if (idev->if_flags & IF_READY) {
2331                                         /* device is already configured. */
2332                                         break;
2333                                 }
2334                                 idev->if_flags |= IF_READY;
2335                         }
2336
2337                         printk(KERN_INFO
2338                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2339                                         "link becomes ready\n",
2340                                         dev->name);
2341
2342                         run_pending = 1;
2343                 }
2344
2345                 switch(dev->type) {
2346 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2347                 case ARPHRD_SIT:
2348                         addrconf_sit_config(dev);
2349                         break;
2350 #endif
2351                 case ARPHRD_TUNNEL6:
2352                         addrconf_ip6_tnl_config(dev);
2353                         break;
2354                 case ARPHRD_LOOPBACK:
2355                         init_loopback(dev);
2356                         break;
2357
2358                 default:
2359                         addrconf_dev_config(dev);
2360                         break;
2361                 }
2362                 if (idev) {
2363                         if (run_pending)
2364                                 addrconf_dad_run(idev);
2365
2366                         /* If the MTU changed during the interface down, when the
2367                            interface up, the changed MTU must be reflected in the
2368                            idev as well as routers.
2369                          */
2370                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2371                                 rt6_mtu_change(dev, dev->mtu);
2372                                 idev->cnf.mtu6 = dev->mtu;
2373                         }
2374                         idev->tstamp = jiffies;
2375                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2376                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2377                            stop IPv6 on this interface.
2378                          */
2379                         if (dev->mtu < IPV6_MIN_MTU)
2380                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2381                 }
2382                 break;
2383
2384         case NETDEV_CHANGEMTU:
2385                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2386                         rt6_mtu_change(dev, dev->mtu);
2387                         idev->cnf.mtu6 = dev->mtu;
2388                         break;
2389                 }
2390
2391                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2392                         idev = ipv6_add_dev(dev);
2393                         if (idev)
2394                                 break;
2395                 }
2396
2397                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2398
2399         case NETDEV_DOWN:
2400         case NETDEV_UNREGISTER:
2401                 /*
2402                  *      Remove all addresses from this interface.
2403                  */
2404                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2405                 break;
2406
2407         case NETDEV_CHANGENAME:
2408                 if (idev) {
2409                         snmp6_unregister_dev(idev);
2410                         addrconf_sysctl_unregister(idev);
2411                         addrconf_sysctl_register(idev);
2412                         err = snmp6_register_dev(idev);
2413                         if (err)
2414                                 return notifier_from_errno(err);
2415                 }
2416                 break;
2417         }
2418
2419         return NOTIFY_OK;
2420 }
2421
2422 /*
2423  *      addrconf module should be notified of a device going up
2424  */
2425 static struct notifier_block ipv6_dev_notf = {
2426         .notifier_call = addrconf_notify,
2427         .priority = 0
2428 };
2429
2430 static int addrconf_ifdown(struct net_device *dev, int how)
2431 {
2432         struct inet6_dev *idev;
2433         struct inet6_ifaddr *ifa, **bifa;
2434         int i;
2435
2436         ASSERT_RTNL();
2437
2438         if (dev == init_net.loopback_dev && how == 1)
2439                 how = 0;
2440
2441         rt6_ifdown(dev);
2442         neigh_ifdown(&nd_tbl, dev);
2443
2444         idev = __in6_dev_get(dev);
2445         if (idev == NULL)
2446                 return -ENODEV;
2447
2448         /* Step 1: remove reference to ipv6 device from parent device.
2449                    Do not dev_put!
2450          */
2451         if (how == 1) {
2452                 idev->dead = 1;
2453
2454                 /* protected by rtnl_lock */
2455                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2456
2457                 /* Step 1.5: remove snmp6 entry */
2458                 snmp6_unregister_dev(idev);
2459
2460         }
2461
2462         /* Step 2: clear hash table */
2463         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2464                 bifa = &inet6_addr_lst[i];
2465
2466                 write_lock_bh(&addrconf_hash_lock);
2467                 while ((ifa = *bifa) != NULL) {
2468                         if (ifa->idev == idev) {
2469                                 *bifa = ifa->lst_next;
2470                                 ifa->lst_next = NULL;
2471                                 addrconf_del_timer(ifa);
2472                                 in6_ifa_put(ifa);
2473                                 continue;
2474                         }
2475                         bifa = &ifa->lst_next;
2476                 }
2477                 write_unlock_bh(&addrconf_hash_lock);
2478         }
2479
2480         write_lock_bh(&idev->lock);
2481
2482         /* Step 3: clear flags for stateless addrconf */
2483         if (how != 1)
2484                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2485
2486         /* Step 4: clear address list */
2487 #ifdef CONFIG_IPV6_PRIVACY
2488         if (how == 1 && del_timer(&idev->regen_timer))
2489                 in6_dev_put(idev);
2490
2491         /* clear tempaddr list */
2492         while ((ifa = idev->tempaddr_list) != NULL) {
2493                 idev->tempaddr_list = ifa->tmp_next;
2494                 ifa->tmp_next = NULL;
2495                 ifa->dead = 1;
2496                 write_unlock_bh(&idev->lock);
2497                 spin_lock_bh(&ifa->lock);
2498
2499                 if (ifa->ifpub) {
2500                         in6_ifa_put(ifa->ifpub);
2501                         ifa->ifpub = NULL;
2502                 }
2503                 spin_unlock_bh(&ifa->lock);
2504                 in6_ifa_put(ifa);
2505                 write_lock_bh(&idev->lock);
2506         }
2507 #endif
2508         while ((ifa = idev->addr_list) != NULL) {
2509                 idev->addr_list = ifa->if_next;
2510                 ifa->if_next = NULL;
2511                 ifa->dead = 1;
2512                 addrconf_del_timer(ifa);
2513                 write_unlock_bh(&idev->lock);
2514
2515                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2516                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2517                 in6_ifa_put(ifa);
2518
2519                 write_lock_bh(&idev->lock);
2520         }
2521         write_unlock_bh(&idev->lock);
2522
2523         /* Step 5: Discard multicast list */
2524
2525         if (how == 1)
2526                 ipv6_mc_destroy_dev(idev);
2527         else
2528                 ipv6_mc_down(idev);
2529
2530         idev->tstamp = jiffies;
2531
2532         /* Shot the device (if unregistered) */
2533
2534         if (how == 1) {
2535                 addrconf_sysctl_unregister(idev);
2536                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2537                 neigh_ifdown(&nd_tbl, dev);
2538                 in6_dev_put(idev);
2539         }
2540         return 0;
2541 }
2542
2543 static void addrconf_rs_timer(unsigned long data)
2544 {
2545         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2546
2547         if (ifp->idev->cnf.forwarding)
2548                 goto out;
2549
2550         if (ifp->idev->if_flags & IF_RA_RCVD) {
2551                 /*
2552                  *      Announcement received after solicitation
2553                  *      was sent
2554                  */
2555                 goto out;
2556         }
2557
2558         spin_lock(&ifp->lock);
2559         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2560                 struct in6_addr all_routers;
2561
2562                 /* The wait after the last probe can be shorter */
2563                 addrconf_mod_timer(ifp, AC_RS,
2564                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2565                                    ifp->idev->cnf.rtr_solicit_delay :
2566                                    ifp->idev->cnf.rtr_solicit_interval);
2567                 spin_unlock(&ifp->lock);
2568
2569                 ipv6_addr_all_routers(&all_routers);
2570
2571                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2572         } else {
2573                 spin_unlock(&ifp->lock);
2574                 /*
2575                  * Note: we do not support deprecated "all on-link"
2576                  * assumption any longer.
2577                  */
2578                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2579                        ifp->idev->dev->name);
2580         }
2581
2582 out:
2583         in6_ifa_put(ifp);
2584 }
2585
2586 /*
2587  *      Duplicate Address Detection
2588  */
2589 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2590 {
2591         unsigned long rand_num;
2592         struct inet6_dev *idev = ifp->idev;
2593
2594         if (ifp->flags & IFA_F_OPTIMISTIC)
2595                 rand_num = 0;
2596         else
2597                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2598
2599         ifp->probes = idev->cnf.dad_transmits;
2600         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2601 }
2602
2603 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2604 {
2605         struct inet6_dev *idev = ifp->idev;
2606         struct net_device *dev = idev->dev;
2607
2608         addrconf_join_solict(dev, &ifp->addr);
2609
2610         net_srandom(ifp->addr.s6_addr32[3]);
2611
2612         read_lock_bh(&idev->lock);
2613         if (ifp->dead)
2614                 goto out;
2615         spin_lock_bh(&ifp->lock);
2616
2617         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2618             !(ifp->flags&IFA_F_TENTATIVE) ||
2619             ifp->flags & IFA_F_NODAD) {
2620                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2621                 spin_unlock_bh(&ifp->lock);
2622                 read_unlock_bh(&idev->lock);
2623
2624                 addrconf_dad_completed(ifp);
2625                 return;
2626         }
2627
2628         if (!(idev->if_flags & IF_READY)) {
2629                 spin_unlock_bh(&ifp->lock);
2630                 read_unlock_bh(&idev->lock);
2631                 /*
2632                  * If the defice is not ready:
2633                  * - keep it tentative if it is a permanent address.
2634                  * - otherwise, kill it.
2635                  */
2636                 in6_ifa_hold(ifp);
2637                 addrconf_dad_stop(ifp);
2638                 return;
2639         }
2640
2641         /*
2642          * Optimistic nodes can start receiving
2643          * Frames right away
2644          */
2645         if(ifp->flags & IFA_F_OPTIMISTIC)
2646                 ip6_ins_rt(ifp->rt);
2647
2648         addrconf_dad_kick(ifp);
2649         spin_unlock_bh(&ifp->lock);
2650 out:
2651         read_unlock_bh(&idev->lock);
2652 }
2653
2654 static void addrconf_dad_timer(unsigned long data)
2655 {
2656         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2657         struct inet6_dev *idev = ifp->idev;
2658         struct in6_addr unspec;
2659         struct in6_addr mcaddr;
2660
2661         read_lock_bh(&idev->lock);
2662         if (idev->dead) {
2663                 read_unlock_bh(&idev->lock);
2664                 goto out;
2665         }
2666         spin_lock_bh(&ifp->lock);
2667         if (ifp->probes == 0) {
2668                 /*
2669                  * DAD was successful
2670                  */
2671
2672                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2673                 spin_unlock_bh(&ifp->lock);
2674                 read_unlock_bh(&idev->lock);
2675
2676                 addrconf_dad_completed(ifp);
2677
2678                 goto out;
2679         }
2680
2681         ifp->probes--;
2682         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2683         spin_unlock_bh(&ifp->lock);
2684         read_unlock_bh(&idev->lock);
2685
2686         /* send a neighbour solicitation for our addr */
2687         memset(&unspec, 0, sizeof(unspec));
2688         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2689         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2690 out:
2691         in6_ifa_put(ifp);
2692 }
2693
2694 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2695 {
2696         struct net_device *     dev = ifp->idev->dev;
2697
2698         /*
2699          *      Configure the address for reception. Now it is valid.
2700          */
2701
2702         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2703
2704         /* If added prefix is link local and forwarding is off,
2705            start sending router solicitations.
2706          */
2707
2708         if (ifp->idev->cnf.forwarding == 0 &&
2709             ifp->idev->cnf.rtr_solicits > 0 &&
2710             (dev->flags&IFF_LOOPBACK) == 0 &&
2711             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2712                 struct in6_addr all_routers;
2713
2714                 ipv6_addr_all_routers(&all_routers);
2715
2716                 /*
2717                  *      If a host as already performed a random delay
2718                  *      [...] as part of DAD [...] there is no need
2719                  *      to delay again before sending the first RS
2720                  */
2721                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2722
2723                 spin_lock_bh(&ifp->lock);
2724                 ifp->probes = 1;
2725                 ifp->idev->if_flags |= IF_RS_SENT;
2726                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2727                 spin_unlock_bh(&ifp->lock);
2728         }
2729 }
2730
2731 static void addrconf_dad_run(struct inet6_dev *idev) {
2732         struct inet6_ifaddr *ifp;
2733
2734         read_lock_bh(&idev->lock);
2735         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2736                 spin_lock_bh(&ifp->lock);
2737                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2738                         spin_unlock_bh(&ifp->lock);
2739                         continue;
2740                 }
2741                 spin_unlock_bh(&ifp->lock);
2742                 addrconf_dad_kick(ifp);
2743         }
2744         read_unlock_bh(&idev->lock);
2745 }
2746
2747 #ifdef CONFIG_PROC_FS
2748 struct if6_iter_state {
2749         struct seq_net_private p;
2750         int bucket;
2751 };
2752
2753 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2754 {
2755         struct inet6_ifaddr *ifa = NULL;
2756         struct if6_iter_state *state = seq->private;
2757         struct net *net = state->p.net;
2758
2759         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2760                 ifa = inet6_addr_lst[state->bucket];
2761
2762                 while (ifa && ifa->idev->dev->nd_net != net)
2763                         ifa = ifa->lst_next;
2764                 if (ifa)
2765                         break;
2766         }
2767         return ifa;
2768 }
2769
2770 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2771 {
2772         struct if6_iter_state *state = seq->private;
2773         struct net *net = state->p.net;
2774
2775         ifa = ifa->lst_next;
2776 try_again:
2777         if (ifa) {
2778                 if (ifa->idev->dev->nd_net != net) {
2779                         ifa = ifa->lst_next;
2780                         goto try_again;
2781                 }
2782         }
2783
2784         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2785                 ifa = inet6_addr_lst[state->bucket];
2786                 goto try_again;
2787         }
2788
2789         return ifa;
2790 }
2791
2792 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2793 {
2794         struct inet6_ifaddr *ifa = if6_get_first(seq);
2795
2796         if (ifa)
2797                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2798                         --pos;
2799         return pos ? NULL : ifa;
2800 }
2801
2802 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2803         __acquires(addrconf_hash_lock)
2804 {
2805         read_lock_bh(&addrconf_hash_lock);
2806         return if6_get_idx(seq, *pos);
2807 }
2808
2809 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2810 {
2811         struct inet6_ifaddr *ifa;
2812
2813         ifa = if6_get_next(seq, v);
2814         ++*pos;
2815         return ifa;
2816 }
2817
2818 static void if6_seq_stop(struct seq_file *seq, void *v)
2819         __releases(addrconf_hash_lock)
2820 {
2821         read_unlock_bh(&addrconf_hash_lock);
2822 }
2823
2824 static int if6_seq_show(struct seq_file *seq, void *v)
2825 {
2826         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2827         seq_printf(seq,
2828                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2829                    NIP6(ifp->addr),
2830                    ifp->idev->dev->ifindex,
2831                    ifp->prefix_len,
2832                    ifp->scope,
2833                    ifp->flags,
2834                    ifp->idev->dev->name);
2835         return 0;
2836 }
2837
2838 static const struct seq_operations if6_seq_ops = {
2839         .start  = if6_seq_start,
2840         .next   = if6_seq_next,
2841         .show   = if6_seq_show,
2842         .stop   = if6_seq_stop,
2843 };
2844
2845 static int if6_seq_open(struct inode *inode, struct file *file)
2846 {
2847         return seq_open_net(inode, file, &if6_seq_ops,
2848                             sizeof(struct if6_iter_state));
2849 }
2850
2851 static const struct file_operations if6_fops = {
2852         .owner          = THIS_MODULE,
2853         .open           = if6_seq_open,
2854         .read           = seq_read,
2855         .llseek         = seq_lseek,
2856         .release        = seq_release_net,
2857 };
2858
2859 static int if6_proc_net_init(struct net *net)
2860 {
2861         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2862                 return -ENOMEM;
2863         return 0;
2864 }
2865
2866 static void if6_proc_net_exit(struct net *net)
2867 {
2868        proc_net_remove(net, "if_inet6");
2869 }
2870
2871 static struct pernet_operations if6_proc_net_ops = {
2872        .init = if6_proc_net_init,
2873        .exit = if6_proc_net_exit,
2874 };
2875
2876 int __init if6_proc_init(void)
2877 {
2878         return register_pernet_subsys(&if6_proc_net_ops);
2879 }
2880
2881 void if6_proc_exit(void)
2882 {
2883         unregister_pernet_subsys(&if6_proc_net_ops);
2884 }
2885 #endif  /* CONFIG_PROC_FS */
2886
2887 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2888 /* Check if address is a home address configured on any interface. */
2889 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2890 {
2891         int ret = 0;
2892         struct inet6_ifaddr * ifp;
2893         u8 hash = ipv6_addr_hash(addr);
2894         read_lock_bh(&addrconf_hash_lock);
2895         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2896                 if (ifp->idev->dev->nd_net != net)
2897                         continue;
2898                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2899                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2900                         ret = 1;
2901                         break;
2902                 }
2903         }
2904         read_unlock_bh(&addrconf_hash_lock);
2905         return ret;
2906 }
2907 #endif
2908
2909 /*
2910  *      Periodic address status verification
2911  */
2912
2913 static void addrconf_verify(unsigned long foo)
2914 {
2915         struct inet6_ifaddr *ifp;
2916         unsigned long now, next;
2917         int i;
2918
2919         spin_lock_bh(&addrconf_verify_lock);
2920         now = jiffies;
2921         next = now + ADDR_CHECK_FREQUENCY;
2922
2923         del_timer(&addr_chk_timer);
2924
2925         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2926
2927 restart:
2928                 read_lock(&addrconf_hash_lock);
2929                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2930                         unsigned long age;
2931 #ifdef CONFIG_IPV6_PRIVACY
2932                         unsigned long regen_advance;
2933 #endif
2934
2935                         if (ifp->flags & IFA_F_PERMANENT)
2936                                 continue;
2937
2938                         spin_lock(&ifp->lock);
2939                         age = (now - ifp->tstamp) / HZ;
2940
2941 #ifdef CONFIG_IPV6_PRIVACY
2942                         regen_advance = ifp->idev->cnf.regen_max_retry *
2943                                         ifp->idev->cnf.dad_transmits *
2944                                         ifp->idev->nd_parms->retrans_time / HZ;
2945 #endif
2946
2947                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2948                             age >= ifp->valid_lft) {
2949                                 spin_unlock(&ifp->lock);
2950                                 in6_ifa_hold(ifp);
2951                                 read_unlock(&addrconf_hash_lock);
2952                                 ipv6_del_addr(ifp);
2953                                 goto restart;
2954                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2955                                 spin_unlock(&ifp->lock);
2956                                 continue;
2957                         } else if (age >= ifp->prefered_lft) {
2958                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2959                                 int deprecate = 0;
2960
2961                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2962                                         deprecate = 1;
2963                                         ifp->flags |= IFA_F_DEPRECATED;
2964                                 }
2965
2966                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2967                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2968
2969                                 spin_unlock(&ifp->lock);
2970
2971                                 if (deprecate) {
2972                                         in6_ifa_hold(ifp);
2973                                         read_unlock(&addrconf_hash_lock);
2974
2975                                         ipv6_ifa_notify(0, ifp);
2976                                         in6_ifa_put(ifp);
2977                                         goto restart;
2978                                 }
2979 #ifdef CONFIG_IPV6_PRIVACY
2980                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2981                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2982                                 if (age >= ifp->prefered_lft - regen_advance) {
2983                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2984                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2985                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2986                                         if (!ifp->regen_count && ifpub) {
2987                                                 ifp->regen_count++;
2988                                                 in6_ifa_hold(ifp);
2989                                                 in6_ifa_hold(ifpub);
2990                                                 spin_unlock(&ifp->lock);
2991                                                 read_unlock(&addrconf_hash_lock);
2992                                                 spin_lock(&ifpub->lock);
2993                                                 ifpub->regen_count = 0;
2994                                                 spin_unlock(&ifpub->lock);
2995                                                 ipv6_create_tempaddr(ifpub, ifp);
2996                                                 in6_ifa_put(ifpub);
2997                                                 in6_ifa_put(ifp);
2998                                                 goto restart;
2999                                         }
3000                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3001                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3002                                 spin_unlock(&ifp->lock);
3003 #endif
3004                         } else {
3005                                 /* ifp->prefered_lft <= ifp->valid_lft */
3006                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3007                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3008                                 spin_unlock(&ifp->lock);
3009                         }
3010                 }
3011                 read_unlock(&addrconf_hash_lock);
3012         }
3013
3014         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3015         add_timer(&addr_chk_timer);
3016         spin_unlock_bh(&addrconf_verify_lock);
3017 }
3018
3019 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3020 {
3021         struct in6_addr *pfx = NULL;
3022
3023         if (addr)
3024                 pfx = nla_data(addr);
3025
3026         if (local) {
3027                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3028                         pfx = NULL;
3029                 else
3030                         pfx = nla_data(local);
3031         }
3032
3033         return pfx;
3034 }
3035
3036 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3037         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3038         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3039         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3040 };
3041
3042 static int
3043 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3044 {
3045         struct net *net = skb->sk->sk_net;
3046         struct ifaddrmsg *ifm;
3047         struct nlattr *tb[IFA_MAX+1];
3048         struct in6_addr *pfx;
3049         int err;
3050
3051         if (net != &init_net)
3052                 return -EINVAL;
3053
3054         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3055         if (err < 0)
3056                 return err;
3057
3058         ifm = nlmsg_data(nlh);
3059         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3060         if (pfx == NULL)
3061                 return -EINVAL;
3062
3063         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3064 }
3065
3066 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3067                              u32 prefered_lft, u32 valid_lft)
3068 {
3069         u32 flags = RTF_EXPIRES;
3070
3071         if (!valid_lft || (prefered_lft > valid_lft))
3072                 return -EINVAL;
3073
3074         if (valid_lft == INFINITY_LIFE_TIME) {
3075                 ifa_flags |= IFA_F_PERMANENT;
3076                 flags = 0;
3077         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3078                 valid_lft = 0x7FFFFFFF/HZ;
3079
3080         if (prefered_lft == 0)
3081                 ifa_flags |= IFA_F_DEPRECATED;
3082         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3083                  (prefered_lft != INFINITY_LIFE_TIME))
3084                 prefered_lft = 0x7FFFFFFF/HZ;
3085
3086         spin_lock_bh(&ifp->lock);
3087         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3088         ifp->tstamp = jiffies;
3089         ifp->valid_lft = valid_lft;
3090         ifp->prefered_lft = prefered_lft;
3091
3092         spin_unlock_bh(&ifp->lock);
3093         if (!(ifp->flags&IFA_F_TENTATIVE))
3094                 ipv6_ifa_notify(0, ifp);
3095
3096         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3097                               jiffies_to_clock_t(valid_lft * HZ), flags);
3098         addrconf_verify(0);
3099
3100         return 0;
3101 }
3102
3103 static int
3104 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3105 {
3106         struct net *net = skb->sk->sk_net;
3107         struct ifaddrmsg *ifm;
3108         struct nlattr *tb[IFA_MAX+1];
3109         struct in6_addr *pfx;
3110         struct inet6_ifaddr *ifa;
3111         struct net_device *dev;
3112         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3113         u8 ifa_flags;
3114         int err;
3115
3116         if (net != &init_net)
3117                 return -EINVAL;
3118
3119         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3120         if (err < 0)
3121                 return err;
3122
3123         ifm = nlmsg_data(nlh);
3124         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3125         if (pfx == NULL)
3126                 return -EINVAL;
3127
3128         if (tb[IFA_CACHEINFO]) {
3129                 struct ifa_cacheinfo *ci;
3130
3131                 ci = nla_data(tb[IFA_CACHEINFO]);
3132                 valid_lft = ci->ifa_valid;
3133                 preferred_lft = ci->ifa_prefered;
3134         } else {
3135                 preferred_lft = INFINITY_LIFE_TIME;
3136                 valid_lft = INFINITY_LIFE_TIME;
3137         }
3138
3139         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3140         if (dev == NULL)
3141                 return -ENODEV;
3142
3143         /* We ignore other flags so far. */
3144         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3145
3146         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3147         if (ifa == NULL) {
3148                 /*
3149                  * It would be best to check for !NLM_F_CREATE here but
3150                  * userspace alreay relies on not having to provide this.
3151                  */
3152                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3153                                       ifa_flags, preferred_lft, valid_lft);
3154         }
3155
3156         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3157             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3158                 err = -EEXIST;
3159         else
3160                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3161
3162         in6_ifa_put(ifa);
3163
3164         return err;
3165 }
3166
3167 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3168                           u8 scope, int ifindex)
3169 {
3170         struct ifaddrmsg *ifm;
3171
3172         ifm = nlmsg_data(nlh);
3173         ifm->ifa_family = AF_INET6;
3174         ifm->ifa_prefixlen = prefixlen;
3175         ifm->ifa_flags = flags;
3176         ifm->ifa_scope = scope;
3177         ifm->ifa_index = ifindex;
3178 }
3179
3180 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3181                          unsigned long tstamp, u32 preferred, u32 valid)
3182 {
3183         struct ifa_cacheinfo ci;
3184
3185         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3186                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3187         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3188                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3189         ci.ifa_prefered = preferred;
3190         ci.ifa_valid = valid;
3191
3192         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3193 }
3194
3195 static inline int rt_scope(int ifa_scope)
3196 {
3197         if (ifa_scope & IFA_HOST)
3198                 return RT_SCOPE_HOST;
3199         else if (ifa_scope & IFA_LINK)
3200                 return RT_SCOPE_LINK;
3201         else if (ifa_scope & IFA_SITE)
3202                 return RT_SCOPE_SITE;
3203         else
3204                 return RT_SCOPE_UNIVERSE;
3205 }
3206
3207 static inline int inet6_ifaddr_msgsize(void)
3208 {
3209         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3210                + nla_total_size(16) /* IFA_ADDRESS */
3211                + nla_total_size(sizeof(struct ifa_cacheinfo));
3212 }
3213
3214 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3215                              u32 pid, u32 seq, int event, unsigned int flags)
3216 {
3217         struct nlmsghdr  *nlh;
3218         u32 preferred, valid;
3219
3220         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3221         if (nlh == NULL)
3222                 return -EMSGSIZE;
3223
3224         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3225                       ifa->idev->dev->ifindex);
3226
3227         if (!(ifa->flags&IFA_F_PERMANENT)) {
3228                 preferred = ifa->prefered_lft;
3229                 valid = ifa->valid_lft;
3230                 if (preferred != INFINITY_LIFE_TIME) {
3231                         long tval = (jiffies - ifa->tstamp)/HZ;
3232                         preferred -= tval;
3233                         if (valid != INFINITY_LIFE_TIME)
3234                                 valid -= tval;
3235                 }
3236         } else {
3237                 preferred = INFINITY_LIFE_TIME;
3238                 valid = INFINITY_LIFE_TIME;
3239         }
3240
3241         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3242             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3243                 nlmsg_cancel(skb, nlh);
3244                 return -EMSGSIZE;
3245         }
3246
3247         return nlmsg_end(skb, nlh);
3248 }
3249
3250 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3251                                 u32 pid, u32 seq, int event, u16 flags)
3252 {
3253         struct nlmsghdr  *nlh;
3254         u8 scope = RT_SCOPE_UNIVERSE;
3255         int ifindex = ifmca->idev->dev->ifindex;
3256
3257         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3258                 scope = RT_SCOPE_SITE;
3259
3260         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3261         if (nlh == NULL)
3262                 return -EMSGSIZE;
3263
3264         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3265         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3266             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3267                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3268                 nlmsg_cancel(skb, nlh);
3269                 return -EMSGSIZE;
3270         }
3271
3272         return nlmsg_end(skb, nlh);
3273 }
3274
3275 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3276                                 u32 pid, u32 seq, int event, unsigned int flags)
3277 {
3278         struct nlmsghdr  *nlh;
3279         u8 scope = RT_SCOPE_UNIVERSE;
3280         int ifindex = ifaca->aca_idev->dev->ifindex;
3281
3282         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3283                 scope = RT_SCOPE_SITE;
3284
3285         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3286         if (nlh == NULL)
3287                 return -EMSGSIZE;
3288
3289         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3290         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3291             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3292                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3293                 nlmsg_cancel(skb, nlh);
3294                 return -EMSGSIZE;
3295         }
3296
3297         return nlmsg_end(skb, nlh);
3298 }
3299
3300 enum addr_type_t
3301 {
3302         UNICAST_ADDR,
3303         MULTICAST_ADDR,
3304         ANYCAST_ADDR,
3305 };
3306
3307 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3308                            enum addr_type_t type)
3309 {
3310         int idx, ip_idx;
3311         int s_idx, s_ip_idx;
3312         int err = 1;
3313         struct net_device *dev;
3314         struct inet6_dev *idev = NULL;
3315         struct inet6_ifaddr *ifa;
3316         struct ifmcaddr6 *ifmca;
3317         struct ifacaddr6 *ifaca;
3318
3319         s_idx = cb->args[0];
3320         s_ip_idx = ip_idx = cb->args[1];
3321
3322         idx = 0;
3323         for_each_netdev(&init_net, dev) {
3324                 if (idx < s_idx)
3325                         goto cont;
3326                 if (idx > s_idx)
3327                         s_ip_idx = 0;
3328                 ip_idx = 0;
3329                 if ((idev = in6_dev_get(dev)) == NULL)
3330                         goto cont;
3331                 read_lock_bh(&idev->lock);
3332                 switch (type) {
3333                 case UNICAST_ADDR:
3334                         /* unicast address incl. temp addr */
3335                         for (ifa = idev->addr_list; ifa;
3336                              ifa = ifa->if_next, ip_idx++) {
3337                                 if (ip_idx < s_ip_idx)
3338                                         continue;
3339                                 err = inet6_fill_ifaddr(skb, ifa,
3340                                                         NETLINK_CB(cb->skb).pid,
3341                                                         cb->nlh->nlmsg_seq,
3342                                                         RTM_NEWADDR,
3343                                                         NLM_F_MULTI);
3344                         }
3345                         break;
3346                 case MULTICAST_ADDR:
3347                         /* multicast address */
3348                         for (ifmca = idev->mc_list; ifmca;
3349                              ifmca = ifmca->next, ip_idx++) {
3350                                 if (ip_idx < s_ip_idx)
3351                                         continue;
3352                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3353                                                           NETLINK_CB(cb->skb).pid,
3354                                                           cb->nlh->nlmsg_seq,
3355                                                           RTM_GETMULTICAST,
3356                                                           NLM_F_MULTI);
3357                         }
3358                         break;
3359                 case ANYCAST_ADDR:
3360                         /* anycast address */
3361                         for (ifaca = idev->ac_list; ifaca;
3362                              ifaca = ifaca->aca_next, ip_idx++) {
3363                                 if (ip_idx < s_ip_idx)
3364                                         continue;
3365                                 err = inet6_fill_ifacaddr(skb, ifaca,
3366                                                           NETLINK_CB(cb->skb).pid,
3367                                                           cb->nlh->nlmsg_seq,
3368                                                           RTM_GETANYCAST,
3369                                                           NLM_F_MULTI);
3370                         }
3371                         break;
3372                 default:
3373                         break;
3374                 }
3375                 read_unlock_bh(&idev->lock);
3376                 in6_dev_put(idev);
3377
3378                 if (err <= 0)
3379                         break;
3380 cont:
3381                 idx++;
3382         }
3383         cb->args[0] = idx;
3384         cb->args[1] = ip_idx;
3385         return skb->len;
3386 }
3387
3388 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3389 {
3390         struct net *net = skb->sk->sk_net;
3391         enum addr_type_t type = UNICAST_ADDR;
3392
3393         if (net != &init_net)
3394                 return 0;
3395
3396         return inet6_dump_addr(skb, cb, type);
3397 }
3398
3399 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3400 {
3401         struct net *net = skb->sk->sk_net;
3402         enum addr_type_t type = MULTICAST_ADDR;
3403
3404         if (net != &init_net)
3405                 return 0;
3406
3407         return inet6_dump_addr(skb, cb, type);
3408 }
3409
3410
3411 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3412 {
3413         struct net *net = skb->sk->sk_net;
3414         enum addr_type_t type = ANYCAST_ADDR;
3415
3416         if (net != &init_net)
3417                 return 0;
3418
3419         return inet6_dump_addr(skb, cb, type);
3420 }
3421
3422 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3423                              void *arg)
3424 {
3425         struct net *net = in_skb->sk->sk_net;
3426         struct ifaddrmsg *ifm;
3427         struct nlattr *tb[IFA_MAX+1];
3428         struct in6_addr *addr = NULL;
3429         struct net_device *dev = NULL;
3430         struct inet6_ifaddr *ifa;
3431         struct sk_buff *skb;
3432         int err;
3433
3434         if (net != &init_net)
3435                 return -EINVAL;
3436
3437         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3438         if (err < 0)
3439                 goto errout;
3440
3441         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3442         if (addr == NULL) {
3443                 err = -EINVAL;
3444                 goto errout;
3445         }
3446
3447         ifm = nlmsg_data(nlh);
3448         if (ifm->ifa_index)
3449                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3450
3451         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3452                 err = -EADDRNOTAVAIL;
3453                 goto errout;
3454         }
3455
3456         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3457                 err = -ENOBUFS;
3458                 goto errout_ifa;
3459         }
3460
3461         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3462                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3463         if (err < 0) {
3464                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3465                 WARN_ON(err == -EMSGSIZE);
3466                 kfree_skb(skb);
3467                 goto errout_ifa;
3468         }
3469         err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3470 errout_ifa:
3471         in6_ifa_put(ifa);
3472 errout:
3473         return err;
3474 }
3475
3476 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3477 {
3478         struct sk_buff *skb;
3479         int err = -ENOBUFS;
3480
3481         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3482         if (skb == NULL)
3483                 goto errout;
3484
3485         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3486         if (err < 0) {
3487                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3488                 WARN_ON(err == -EMSGSIZE);
3489                 kfree_skb(skb);
3490                 goto errout;
3491         }
3492         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3493 errout:
3494         if (err < 0)
3495                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3496 }
3497
3498 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3499                                 __s32 *array, int bytes)
3500 {
3501         BUG_ON(bytes < (DEVCONF_MAX * 4));
3502
3503         memset(array, 0, bytes);
3504         array[DEVCONF_FORWARDING] = cnf->forwarding;
3505         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3506         array[DEVCONF_MTU6] = cnf->mtu6;
3507         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3508         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3509         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3510         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3511         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3512         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3513         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3514         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3515 #ifdef CONFIG_IPV6_PRIVACY
3516         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3517         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3518         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3519         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3520         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3521 #endif
3522         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3523         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3524         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3525 #ifdef CONFIG_IPV6_ROUTER_PREF
3526         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3527         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3528 #ifdef CONFIG_IPV6_ROUTE_INFO
3529         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3530 #endif
3531 #endif
3532         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3533         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3534 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3535         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3536 #endif
3537 }
3538
3539 static inline size_t inet6_if_nlmsg_size(void)
3540 {
3541         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3542                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3543                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3544                + nla_total_size(4) /* IFLA_MTU */
3545                + nla_total_size(4) /* IFLA_LINK */
3546                + nla_total_size( /* IFLA_PROTINFO */
3547                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3548                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3549                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3550                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3551                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3552                  );
3553 }
3554
3555 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3556                                       int bytes)
3557 {
3558         int i;
3559         int pad = bytes - sizeof(u64) * items;
3560         BUG_ON(pad < 0);
3561
3562         /* Use put_unaligned() because stats may not be aligned for u64. */
3563         put_unaligned(items, &stats[0]);
3564         for (i = 1; i < items; i++)
3565                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3566
3567         memset(&stats[items], 0, pad);
3568 }
3569
3570 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3571                              int bytes)
3572 {
3573         switch(attrtype) {
3574         case IFLA_INET6_STATS:
3575                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3576                 break;
3577         case IFLA_INET6_ICMP6STATS:
3578                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3579                 break;
3580         }
3581 }
3582
3583 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3584                              u32 pid, u32 seq, int event, unsigned int flags)
3585 {
3586         struct net_device *dev = idev->dev;
3587         struct nlattr *nla;
3588         struct ifinfomsg *hdr;
3589         struct nlmsghdr *nlh;
3590         void *protoinfo;
3591         struct ifla_cacheinfo ci;
3592
3593         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3594         if (nlh == NULL)
3595                 return -EMSGSIZE;
3596
3597         hdr = nlmsg_data(nlh);
3598         hdr->ifi_family = AF_INET6;
3599         hdr->__ifi_pad = 0;
3600         hdr->ifi_type = dev->type;
3601         hdr->ifi_index = dev->ifindex;
3602         hdr->ifi_flags = dev_get_flags(dev);
3603         hdr->ifi_change = 0;
3604
3605         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3606
3607         if (dev->addr_len)
3608                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3609
3610         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3611         if (dev->ifindex != dev->iflink)
3612                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3613
3614         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3615         if (protoinfo == NULL)
3616                 goto nla_put_failure;
3617
3618         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3619
3620         ci.max_reasm_len = IPV6_MAXPLEN;
3621         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3622                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3623         ci.reachable_time = idev->nd_parms->reachable_time;
3624         ci.retrans_time = idev->nd_parms->retrans_time;
3625         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3626
3627         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3628         if (nla == NULL)
3629                 goto nla_put_failure;
3630         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3631
3632         /* XXX - MC not implemented */
3633
3634         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3635         if (nla == NULL)
3636                 goto nla_put_failure;
3637         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3638
3639         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3640         if (nla == NULL)
3641                 goto nla_put_failure;
3642         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3643
3644         nla_nest_end(skb, protoinfo);
3645         return nlmsg_end(skb, nlh);
3646
3647 nla_put_failure:
3648         nlmsg_cancel(skb, nlh);
3649         return -EMSGSIZE;
3650 }
3651
3652 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3653 {
3654         struct net *net = skb->sk->sk_net;
3655         int idx, err;
3656         int s_idx = cb->args[0];
3657         struct net_device *dev;
3658         struct inet6_dev *idev;
3659
3660         if (net != &init_net)
3661                 return 0;
3662
3663         read_lock(&dev_base_lock);
3664         idx = 0;
3665         for_each_netdev(&init_net, dev) {
3666                 if (idx < s_idx)
3667                         goto cont;
3668                 if ((idev = in6_dev_get(dev)) == NULL)
3669                         goto cont;
3670                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3671                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3672                 in6_dev_put(idev);
3673                 if (err <= 0)
3674                         break;
3675 cont:
3676                 idx++;
3677         }
3678         read_unlock(&dev_base_lock);
3679         cb->args[0] = idx;
3680
3681         return skb->len;
3682 }
3683
3684 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3685 {
3686         struct sk_buff *skb;
3687         int err = -ENOBUFS;
3688
3689         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3690         if (skb == NULL)
3691                 goto errout;
3692
3693         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3694         if (err < 0) {
3695                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3696                 WARN_ON(err == -EMSGSIZE);
3697                 kfree_skb(skb);
3698                 goto errout;
3699         }
3700         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3701 errout:
3702         if (err < 0)
3703                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3704 }
3705
3706 static inline size_t inet6_prefix_nlmsg_size(void)
3707 {
3708         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3709                + nla_total_size(sizeof(struct in6_addr))
3710                + nla_total_size(sizeof(struct prefix_cacheinfo));
3711 }
3712
3713 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3714                              struct prefix_info *pinfo, u32 pid, u32 seq,
3715                              int event, unsigned int flags)
3716 {
3717         struct prefixmsg *pmsg;
3718         struct nlmsghdr *nlh;
3719         struct prefix_cacheinfo ci;
3720
3721         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3722         if (nlh == NULL)
3723                 return -EMSGSIZE;
3724
3725         pmsg = nlmsg_data(nlh);
3726         pmsg->prefix_family = AF_INET6;
3727         pmsg->prefix_pad1 = 0;
3728         pmsg->prefix_pad2 = 0;
3729         pmsg->prefix_ifindex = idev->dev->ifindex;
3730         pmsg->prefix_len = pinfo->prefix_len;
3731         pmsg->prefix_type = pinfo->type;
3732         pmsg->prefix_pad3 = 0;
3733         pmsg->prefix_flags = 0;
3734         if (pinfo->onlink)
3735                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3736         if (pinfo->autoconf)
3737                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3738
3739         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3740
3741         ci.preferred_time = ntohl(pinfo->prefered);
3742         ci.valid_time = ntohl(pinfo->valid);
3743         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3744
3745         return nlmsg_end(skb, nlh);
3746
3747 nla_put_failure:
3748         nlmsg_cancel(skb, nlh);
3749         return -EMSGSIZE;
3750 }
3751
3752 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3753                          struct prefix_info *pinfo)
3754 {
3755         struct sk_buff *skb;
3756         int err = -ENOBUFS;
3757
3758         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3759         if (skb == NULL)
3760                 goto errout;
3761
3762         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3763         if (err < 0) {
3764                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3765                 WARN_ON(err == -EMSGSIZE);
3766                 kfree_skb(skb);
3767                 goto errout;
3768         }
3769         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3770 errout:
3771         if (err < 0)
3772                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3773 }
3774
3775 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3776 {
3777         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3778
3779         switch (event) {
3780         case RTM_NEWADDR:
3781                 /*
3782                  * If the address was optimistic
3783                  * we inserted the route at the start of
3784                  * our DAD process, so we don't need
3785                  * to do it again
3786                  */
3787                 if (!(ifp->rt->rt6i_node))
3788                         ip6_ins_rt(ifp->rt);
3789                 if (ifp->idev->cnf.forwarding)
3790                         addrconf_join_anycast(ifp);
3791                 break;
3792         case RTM_DELADDR:
3793                 if (ifp->idev->cnf.forwarding)
3794                         addrconf_leave_anycast(ifp);
3795                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3796                 dst_hold(&ifp->rt->u.dst);
3797                 if (ip6_del_rt(ifp->rt))
3798                         dst_free(&ifp->rt->u.dst);
3799                 break;
3800         }
3801 }
3802
3803 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3804 {
3805         rcu_read_lock_bh();
3806         if (likely(ifp->idev->dead == 0))
3807                 __ipv6_ifa_notify(event, ifp);
3808         rcu_read_unlock_bh();
3809 }
3810
3811 #ifdef CONFIG_SYSCTL
3812
3813 static
3814 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3815                            void __user *buffer, size_t *lenp, loff_t *ppos)
3816 {
3817         int *valp = ctl->data;
3818         int val = *valp;
3819         int ret;
3820
3821         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3822
3823         if (write)
3824                 addrconf_fixup_forwarding(ctl, valp, val);
3825         return ret;
3826 }
3827
3828 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3829                                             int __user *name, int nlen,
3830                                             void __user *oldval,
3831                                             size_t __user *oldlenp,
3832                                             void __user *newval, size_t newlen)
3833 {
3834         int *valp = table->data;
3835         int val = *valp;
3836         int new;
3837
3838         if (!newval || !newlen)
3839                 return 0;
3840         if (newlen != sizeof(int))
3841                 return -EINVAL;
3842         if (get_user(new, (int __user *)newval))
3843                 return -EFAULT;
3844         if (new == *valp)
3845                 return 0;
3846         if (oldval && oldlenp) {
3847                 size_t len;
3848                 if (get_user(len, oldlenp))
3849                         return -EFAULT;
3850                 if (len) {
3851                         if (len > table->maxlen)
3852                                 len = table->maxlen;
3853                         if (copy_to_user(oldval, valp, len))
3854                                 return -EFAULT;
3855                         if (put_user(len, oldlenp))
3856                                 return -EFAULT;
3857                 }
3858         }
3859
3860         *valp = new;
3861         addrconf_fixup_forwarding(table, valp, val);
3862         return 1;
3863 }
3864
3865 static struct addrconf_sysctl_table
3866 {
3867         struct ctl_table_header *sysctl_header;
3868         ctl_table addrconf_vars[__NET_IPV6_MAX];
3869         char *dev_name;
3870 } addrconf_sysctl __read_mostly = {
3871         .sysctl_header = NULL,
3872         .addrconf_vars = {
3873                 {
3874                         .ctl_name       =       NET_IPV6_FORWARDING,
3875                         .procname       =       "forwarding",
3876                         .data           =       &ipv6_devconf.forwarding,
3877                         .maxlen         =       sizeof(int),
3878                         .mode           =       0644,
3879                         .proc_handler   =       &addrconf_sysctl_forward,
3880                         .strategy       =       &addrconf_sysctl_forward_strategy,
3881                 },
3882                 {
3883                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3884                         .procname       =       "hop_limit",
3885                         .data           =       &ipv6_devconf.hop_limit,
3886                         .maxlen         =       sizeof(int),
3887                         .mode           =       0644,
3888                         .proc_handler   =       proc_dointvec,
3889                 },
3890                 {
3891                         .ctl_name       =       NET_IPV6_MTU,
3892                         .procname       =       "mtu",
3893                         .data           =       &ipv6_devconf.mtu6,
3894                         .maxlen         =       sizeof(int),
3895                         .mode           =       0644,
3896                         .proc_handler   =       &proc_dointvec,
3897                 },
3898                 {
3899                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3900                         .procname       =       "accept_ra",
3901                         .data           =       &ipv6_devconf.accept_ra,
3902                         .maxlen         =       sizeof(int),
3903                         .mode           =       0644,
3904                         .proc_handler   =       &proc_dointvec,
3905                 },
3906                 {
3907                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3908                         .procname       =       "accept_redirects",
3909                         .data           =       &ipv6_devconf.accept_redirects,
3910                         .maxlen         =       sizeof(int),
3911                         .mode           =       0644,
3912                         .proc_handler   =       &proc_dointvec,
3913                 },
3914                 {
3915                         .ctl_name       =       NET_IPV6_AUTOCONF,
3916                         .procname       =       "autoconf",
3917                         .data           =       &ipv6_devconf.autoconf,
3918                         .maxlen         =       sizeof(int),
3919                         .mode           =       0644,
3920                         .proc_handler   =       &proc_dointvec,
3921                 },
3922                 {
3923                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3924                         .procname       =       "dad_transmits",
3925                         .data           =       &ipv6_devconf.dad_transmits,
3926                         .maxlen         =       sizeof(int),
3927                         .mode           =       0644,
3928                         .proc_handler   =       &proc_dointvec,
3929                 },
3930                 {
3931                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3932                         .procname       =       "router_solicitations",
3933                         .data           =       &ipv6_devconf.rtr_solicits,
3934                         .maxlen         =       sizeof(int),
3935                         .mode           =       0644,
3936                         .proc_handler   =       &proc_dointvec,
3937                 },
3938                 {
3939                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3940                         .procname       =       "router_solicitation_interval",
3941                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3942                         .maxlen         =       sizeof(int),
3943                         .mode           =       0644,
3944                         .proc_handler   =       &proc_dointvec_jiffies,
3945                         .strategy       =       &sysctl_jiffies,
3946                 },
3947                 {
3948                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3949                         .procname       =       "router_solicitation_delay",
3950                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3951                         .maxlen         =       sizeof(int),
3952                         .mode           =       0644,
3953                         .proc_handler   =       &proc_dointvec_jiffies,
3954                         .strategy       =       &sysctl_jiffies,
3955                 },
3956                 {
3957                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3958                         .procname       =       "force_mld_version",
3959                         .data           =       &ipv6_devconf.force_mld_version,
3960                         .maxlen         =       sizeof(int),
3961                         .mode           =       0644,
3962                         .proc_handler   =       &proc_dointvec,
3963                 },
3964 #ifdef CONFIG_IPV6_PRIVACY
3965                 {
3966                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3967                         .procname       =       "use_tempaddr",
3968                         .data           =       &ipv6_devconf.use_tempaddr,
3969                         .maxlen         =       sizeof(int),
3970                         .mode           =       0644,
3971                         .proc_handler   =       &proc_dointvec,
3972                 },
3973                 {
3974                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3975                         .procname       =       "temp_valid_lft",
3976                         .data           =       &ipv6_devconf.temp_valid_lft,
3977                         .maxlen         =       sizeof(int),
3978                         .mode           =       0644,
3979                         .proc_handler   =       &proc_dointvec,
3980                 },
3981                 {
3982                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3983                         .procname       =       "temp_prefered_lft",
3984                         .data           =       &ipv6_devconf.temp_prefered_lft,
3985                         .maxlen         =       sizeof(int),
3986                         .mode           =       0644,
3987                         .proc_handler   =       &proc_dointvec,
3988                 },
3989                 {
3990                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3991                         .procname       =       "regen_max_retry",
3992                         .data           =       &ipv6_devconf.regen_max_retry,
3993                         .maxlen         =       sizeof(int),
3994                         .mode           =       0644,
3995                         .proc_handler   =       &proc_dointvec,
3996                 },
3997                 {
3998                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3999                         .procname       =       "max_desync_factor",
4000                         .data           =       &ipv6_devconf.max_desync_factor,
4001                         .maxlen         =       sizeof(int),
4002                         .mode           =       0644,
4003                         .proc_handler   =       &proc_dointvec,
4004                 },
4005 #endif
4006                 {
4007                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4008                         .procname       =       "max_addresses",
4009                         .data           =       &ipv6_devconf.max_addresses,
4010                         .maxlen         =       sizeof(int),
4011                         .mode           =       0644,
4012                         .proc_handler   =       &proc_dointvec,
4013                 },
4014                 {
4015                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4016                         .procname       =       "accept_ra_defrtr",
4017                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4018                         .maxlen         =       sizeof(int),
4019                         .mode           =       0644,
4020                         .proc_handler   =       &proc_dointvec,
4021                 },
4022                 {
4023                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4024                         .procname       =       "accept_ra_pinfo",
4025                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4026                         .maxlen         =       sizeof(int),
4027                         .mode           =       0644,
4028                         .proc_handler   =       &proc_dointvec,
4029                 },
4030 #ifdef CONFIG_IPV6_ROUTER_PREF
4031                 {
4032                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4033                         .procname       =       "accept_ra_rtr_pref",
4034                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4035                         .maxlen         =       sizeof(int),
4036                         .mode           =       0644,
4037                         .proc_handler   =       &proc_dointvec,
4038                 },
4039                 {
4040                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4041                         .procname       =       "router_probe_interval",
4042                         .data           =       &ipv6_devconf.rtr_probe_interval,
4043                         .maxlen         =       sizeof(int),
4044                         .mode           =       0644,
4045                         .proc_handler   =       &proc_dointvec_jiffies,
4046                         .strategy       =       &sysctl_jiffies,
4047                 },
4048 #ifdef CONFIG_IPV6_ROUTE_INFO
4049                 {
4050                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4051                         .procname       =       "accept_ra_rt_info_max_plen",
4052                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4053                         .maxlen         =       sizeof(int),
4054                         .mode           =       0644,
4055                         .proc_handler   =       &proc_dointvec,
4056                 },
4057 #endif
4058 #endif
4059                 {
4060                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4061                         .procname       =       "proxy_ndp",
4062                         .data           =       &ipv6_devconf.proxy_ndp,
4063                         .maxlen         =       sizeof(int),
4064                         .mode           =       0644,
4065                         .proc_handler   =       &proc_dointvec,
4066                 },
4067                 {
4068                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4069                         .procname       =       "accept_source_route",
4070                         .data           =       &ipv6_devconf.accept_source_route,
4071                         .maxlen         =       sizeof(int),
4072                         .mode           =       0644,
4073                         .proc_handler   =       &proc_dointvec,
4074                 },
4075 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4076                 {
4077                         .ctl_name       =       CTL_UNNUMBERED,
4078                         .procname       =       "optimistic_dad",
4079                         .data           =       &ipv6_devconf.optimistic_dad,
4080                         .maxlen         =       sizeof(int),
4081                         .mode           =       0644,
4082                         .proc_handler   =       &proc_dointvec,
4083
4084                 },
4085 #endif
4086                 {
4087                         .ctl_name       =       0,      /* sentinel */
4088                 }
4089         },
4090 };
4091
4092 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4093                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4094 {
4095         int i;
4096         struct addrconf_sysctl_table *t;
4097
4098 #define ADDRCONF_CTL_PATH_DEV   3
4099
4100         struct ctl_path addrconf_ctl_path[] = {
4101                 { .procname = "net", .ctl_name = CTL_NET, },
4102                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4103                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4104                 { /* to be set */ },
4105                 { },
4106         };
4107
4108
4109         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4110         if (t == NULL)
4111                 goto out;
4112
4113         for (i=0; t->addrconf_vars[i].data; i++) {
4114                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4115                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4116                 t->addrconf_vars[i].extra2 = net;
4117         }
4118
4119         /*
4120          * Make a copy of dev_name, because '.procname' is regarded as const
4121          * by sysctl and we wouldn't want anyone to change it under our feet
4122          * (see SIOCSIFNAME).
4123          */
4124         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4125         if (!t->dev_name)
4126                 goto free;
4127
4128         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4129         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4130
4131         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4132                         t->addrconf_vars);
4133         if (t->sysctl_header == NULL)
4134                 goto free_procname;
4135
4136         p->sysctl = t;
4137         return 0;
4138
4139 free_procname:
4140         kfree(t->dev_name);
4141 free:
4142         kfree(t);
4143 out:
4144         return -ENOBUFS;
4145 }
4146
4147 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4148 {
4149         struct addrconf_sysctl_table *t;
4150
4151         if (p->sysctl == NULL)
4152                 return;
4153
4154         t = p->sysctl;
4155         p->sysctl = NULL;
4156         unregister_sysctl_table(t->sysctl_header);
4157         kfree(t->dev_name);
4158         kfree(t);
4159 }
4160
4161 static void addrconf_sysctl_register(struct inet6_dev *idev)
4162 {
4163         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4164                               NET_IPV6_NEIGH, "ipv6",
4165                               &ndisc_ifinfo_sysctl_change,
4166                               NULL);
4167         __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4168                         idev->dev->ifindex, idev, &idev->cnf);
4169 }
4170
4171 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4172 {
4173         __addrconf_sysctl_unregister(&idev->cnf);
4174         neigh_sysctl_unregister(idev->nd_parms);
4175 }
4176
4177
4178 #endif
4179
4180 static int addrconf_init_net(struct net *net)
4181 {
4182         int err;
4183         struct ipv6_devconf *all, *dflt;
4184
4185         err = -ENOMEM;
4186         all = &ipv6_devconf;
4187         dflt = &ipv6_devconf_dflt;
4188
4189         if (net != &init_net) {
4190                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4191                 if (all == NULL)
4192                         goto err_alloc_all;
4193
4194                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4195                 if (dflt == NULL)
4196                         goto err_alloc_dflt;
4197         }
4198
4199         net->ipv6.devconf_all = all;
4200         net->ipv6.devconf_dflt = dflt;
4201
4202 #ifdef CONFIG_SYSCTL
4203         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4204                         NULL, all);
4205         if (err < 0)
4206                 goto err_reg_all;
4207
4208         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4209                         NULL, dflt);
4210         if (err < 0)
4211                 goto err_reg_dflt;
4212 #endif
4213         return 0;
4214
4215 #ifdef CONFIG_SYSCTL
4216 err_reg_dflt:
4217         __addrconf_sysctl_unregister(all);
4218 err_reg_all:
4219         kfree(dflt);
4220 #endif
4221 err_alloc_dflt:
4222         kfree(all);
4223 err_alloc_all:
4224         return err;
4225 }
4226
4227 static void addrconf_exit_net(struct net *net)
4228 {
4229 #ifdef CONFIG_SYSCTL
4230         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4231         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4232 #endif
4233         if (net != &init_net) {
4234                 kfree(net->ipv6.devconf_dflt);
4235                 kfree(net->ipv6.devconf_all);
4236         }
4237 }
4238
4239 static struct pernet_operations addrconf_ops = {
4240         .init = addrconf_init_net,
4241         .exit = addrconf_exit_net,
4242 };
4243
4244 /*
4245  *      Device notifier
4246  */
4247
4248 int register_inet6addr_notifier(struct notifier_block *nb)
4249 {
4250         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4251 }
4252
4253 EXPORT_SYMBOL(register_inet6addr_notifier);
4254
4255 int unregister_inet6addr_notifier(struct notifier_block *nb)
4256 {
4257         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4258 }
4259
4260 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4261
4262 /*
4263  *      Init / cleanup code
4264  */
4265
4266 int __init addrconf_init(void)
4267 {
4268         int err;
4269
4270         if ((err = ipv6_addr_label_init()) < 0) {
4271                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4272                         err);
4273                 return err;
4274         }
4275
4276         register_pernet_subsys(&addrconf_ops);
4277
4278         /* The addrconf netdev notifier requires that loopback_dev
4279          * has it's ipv6 private information allocated and setup
4280          * before it can bring up and give link-local addresses
4281          * to other devices which are up.
4282          *
4283          * Unfortunately, loopback_dev is not necessarily the first
4284          * entry in the global dev_base list of net devices.  In fact,
4285          * it is likely to be the very last entry on that list.
4286          * So this causes the notifier registry below to try and
4287          * give link-local addresses to all devices besides loopback_dev
4288          * first, then loopback_dev, which cases all the non-loopback_dev
4289          * devices to fail to get a link-local address.
4290          *
4291          * So, as a temporary fix, allocate the ipv6 structure for
4292          * loopback_dev first by hand.
4293          * Longer term, all of the dependencies ipv6 has upon the loopback
4294          * device and it being up should be removed.
4295          */
4296         rtnl_lock();
4297         if (!ipv6_add_dev(init_net.loopback_dev))
4298                 err = -ENOMEM;
4299         rtnl_unlock();
4300         if (err)
4301                 goto errlo;
4302
4303         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4304         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4305 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4306         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4307         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4308         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4309         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4310 #endif
4311
4312         register_netdevice_notifier(&ipv6_dev_notf);
4313
4314         addrconf_verify(0);
4315
4316         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4317         if (err < 0)
4318                 goto errout;
4319
4320         /* Only the first call to __rtnl_register can fail */
4321         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4322         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4323         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4324         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4325         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4326
4327         ipv6_addr_label_rtnl_register();
4328
4329         return 0;
4330 errout:
4331         unregister_netdevice_notifier(&ipv6_dev_notf);
4332 errlo:
4333         unregister_pernet_subsys(&addrconf_ops);
4334
4335         return err;
4336 }
4337
4338 void addrconf_cleanup(void)
4339 {
4340         struct net_device *dev;
4341         struct inet6_ifaddr *ifa;
4342         int i;
4343
4344         unregister_netdevice_notifier(&ipv6_dev_notf);
4345
4346         unregister_pernet_subsys(&addrconf_ops);
4347
4348         rtnl_lock();
4349
4350         /*
4351          *      clean dev list.
4352          */
4353
4354         for_each_netdev(&init_net, dev) {
4355                 if (__in6_dev_get(dev) == NULL)
4356                         continue;
4357                 addrconf_ifdown(dev, 1);
4358         }
4359         addrconf_ifdown(init_net.loopback_dev, 2);
4360
4361         /*
4362          *      Check hash table.
4363          */
4364
4365         write_lock_bh(&addrconf_hash_lock);
4366         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4367                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4368                         struct inet6_ifaddr *bifa;
4369
4370                         bifa = ifa;
4371                         ifa = ifa->lst_next;
4372                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4373                         /* Do not free it; something is wrong.
4374                            Now we can investigate it with debugger.
4375                          */
4376                 }
4377         }
4378         write_unlock_bh(&addrconf_hash_lock);
4379
4380         del_timer(&addr_chk_timer);
4381
4382         rtnl_unlock();
4383 }