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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                         /* Rule 8: Use longest matching prefix */
1129                         if (hiscore.rule < 8) {
1130                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1131                                 hiscore.rule++;
1132                         }
1133                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134                         if (score.matchlen > hiscore.matchlen) {
1135                                 score.rule = 8;
1136                                 goto record_it;
1137                         }
1138 #if 0
1139                         else if (score.matchlen < hiscore.matchlen)
1140                                 continue;
1141 #endif
1142
1143                         /* Final Rule: choose first available one */
1144                         continue;
1145 record_it:
1146                         if (ifa_result)
1147                                 in6_ifa_put(ifa_result);
1148                         in6_ifa_hold(ifa);
1149                         ifa_result = ifa;
1150                         hiscore = score;
1151                 }
1152                 read_unlock_bh(&idev->lock);
1153         }
1154         rcu_read_unlock();
1155         read_unlock(&dev_base_lock);
1156
1157         if (!ifa_result)
1158                 return -EADDRNOTAVAIL;
1159
1160         ipv6_addr_copy(saddr, &ifa_result->addr);
1161         in6_ifa_put(ifa_result);
1162         return 0;
1163 }
1164
1165
1166 int ipv6_get_saddr(struct dst_entry *dst,
1167                    struct in6_addr *daddr, struct in6_addr *saddr)
1168 {
1169         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1170 }
1171
1172 EXPORT_SYMBOL(ipv6_get_saddr);
1173
1174 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175                     unsigned char banned_flags)
1176 {
1177         struct inet6_dev *idev;
1178         int err = -EADDRNOTAVAIL;
1179
1180         rcu_read_lock();
1181         if ((idev = __in6_dev_get(dev)) != NULL) {
1182                 struct inet6_ifaddr *ifp;
1183
1184                 read_lock_bh(&idev->lock);
1185                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1186                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1187                                 ipv6_addr_copy(addr, &ifp->addr);
1188                                 err = 0;
1189                                 break;
1190                         }
1191                 }
1192                 read_unlock_bh(&idev->lock);
1193         }
1194         rcu_read_unlock();
1195         return err;
1196 }
1197
1198 static int ipv6_count_addresses(struct inet6_dev *idev)
1199 {
1200         int cnt = 0;
1201         struct inet6_ifaddr *ifp;
1202
1203         read_lock_bh(&idev->lock);
1204         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1205                 cnt++;
1206         read_unlock_bh(&idev->lock);
1207         return cnt;
1208 }
1209
1210 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1211                   struct net_device *dev, int strict)
1212 {
1213         struct inet6_ifaddr * ifp;
1214         u8 hash = ipv6_addr_hash(addr);
1215
1216         read_lock_bh(&addrconf_hash_lock);
1217         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1218                 if (ifp->idev->dev->nd_net != net)
1219                         continue;
1220                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1221                     !(ifp->flags&IFA_F_TENTATIVE)) {
1222                         if (dev == NULL || ifp->idev->dev == dev ||
1223                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1224                                 break;
1225                 }
1226         }
1227         read_unlock_bh(&addrconf_hash_lock);
1228         return ifp != NULL;
1229 }
1230 EXPORT_SYMBOL(ipv6_chk_addr);
1231
1232 static
1233 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1234                        struct net_device *dev)
1235 {
1236         struct inet6_ifaddr * ifp;
1237         u8 hash = ipv6_addr_hash(addr);
1238
1239         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1240                 if (ifp->idev->dev->nd_net != net)
1241                         continue;
1242                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1243                         if (dev == NULL || ifp->idev->dev == dev)
1244                                 break;
1245                 }
1246         }
1247         return ifp != NULL;
1248 }
1249
1250 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1251                                      struct net_device *dev, int strict)
1252 {
1253         struct inet6_ifaddr * ifp;
1254         u8 hash = ipv6_addr_hash(addr);
1255
1256         read_lock_bh(&addrconf_hash_lock);
1257         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1258                 if (ifp->idev->dev->nd_net != net)
1259                         continue;
1260                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261                         if (dev == NULL || ifp->idev->dev == dev ||
1262                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1263                                 in6_ifa_hold(ifp);
1264                                 break;
1265                         }
1266                 }
1267         }
1268         read_unlock_bh(&addrconf_hash_lock);
1269
1270         return ifp;
1271 }
1272
1273 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1274 {
1275         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1276         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1277         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1278         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1279         int sk_ipv6only = ipv6_only_sock(sk);
1280         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1281         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1282         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1283
1284         if (!sk2_rcv_saddr && !sk_ipv6only)
1285                 return 1;
1286
1287         if (addr_type2 == IPV6_ADDR_ANY &&
1288             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1289                 return 1;
1290
1291         if (addr_type == IPV6_ADDR_ANY &&
1292             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1293                 return 1;
1294
1295         if (sk2_rcv_saddr6 &&
1296             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1297                 return 1;
1298
1299         if (addr_type == IPV6_ADDR_MAPPED &&
1300             !sk2_ipv6only &&
1301             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1302                 return 1;
1303
1304         return 0;
1305 }
1306
1307 /* Gets referenced address, destroys ifaddr */
1308
1309 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1310 {
1311         if (ifp->flags&IFA_F_PERMANENT) {
1312                 spin_lock_bh(&ifp->lock);
1313                 addrconf_del_timer(ifp);
1314                 ifp->flags |= IFA_F_TENTATIVE;
1315                 spin_unlock_bh(&ifp->lock);
1316                 in6_ifa_put(ifp);
1317 #ifdef CONFIG_IPV6_PRIVACY
1318         } else if (ifp->flags&IFA_F_TEMPORARY) {
1319                 struct inet6_ifaddr *ifpub;
1320                 spin_lock_bh(&ifp->lock);
1321                 ifpub = ifp->ifpub;
1322                 if (ifpub) {
1323                         in6_ifa_hold(ifpub);
1324                         spin_unlock_bh(&ifp->lock);
1325                         ipv6_create_tempaddr(ifpub, ifp);
1326                         in6_ifa_put(ifpub);
1327                 } else {
1328                         spin_unlock_bh(&ifp->lock);
1329                 }
1330                 ipv6_del_addr(ifp);
1331 #endif
1332         } else
1333                 ipv6_del_addr(ifp);
1334 }
1335
1336 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1337 {
1338         if (net_ratelimit())
1339                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1340         addrconf_dad_stop(ifp);
1341 }
1342
1343 /* Join to solicited addr multicast group. */
1344
1345 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1346 {
1347         struct in6_addr maddr;
1348
1349         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1350                 return;
1351
1352         addrconf_addr_solict_mult(addr, &maddr);
1353         ipv6_dev_mc_inc(dev, &maddr);
1354 }
1355
1356 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1357 {
1358         struct in6_addr maddr;
1359
1360         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1361                 return;
1362
1363         addrconf_addr_solict_mult(addr, &maddr);
1364         __ipv6_dev_mc_dec(idev, &maddr);
1365 }
1366
1367 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1368 {
1369         struct in6_addr addr;
1370         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1371         if (ipv6_addr_any(&addr))
1372                 return;
1373         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1374 }
1375
1376 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1377 {
1378         struct in6_addr addr;
1379         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1380         if (ipv6_addr_any(&addr))
1381                 return;
1382         __ipv6_dev_ac_dec(ifp->idev, &addr);
1383 }
1384
1385 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1386 {
1387         if (dev->addr_len != ETH_ALEN)
1388                 return -1;
1389         memcpy(eui, dev->dev_addr, 3);
1390         memcpy(eui + 5, dev->dev_addr + 3, 3);
1391
1392         /*
1393          * The zSeries OSA network cards can be shared among various
1394          * OS instances, but the OSA cards have only one MAC address.
1395          * This leads to duplicate address conflicts in conjunction
1396          * with IPv6 if more than one instance uses the same card.
1397          *
1398          * The driver for these cards can deliver a unique 16-bit
1399          * identifier for each instance sharing the same card.  It is
1400          * placed instead of 0xFFFE in the interface identifier.  The
1401          * "u" bit of the interface identifier is not inverted in this
1402          * case.  Hence the resulting interface identifier has local
1403          * scope according to RFC2373.
1404          */
1405         if (dev->dev_id) {
1406                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1407                 eui[4] = dev->dev_id & 0xFF;
1408         } else {
1409                 eui[3] = 0xFF;
1410                 eui[4] = 0xFE;
1411                 eui[0] ^= 2;
1412         }
1413         return 0;
1414 }
1415
1416 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1417 {
1418         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1419         if (dev->addr_len != ARCNET_ALEN)
1420                 return -1;
1421         memset(eui, 0, 7);
1422         eui[7] = *(u8*)dev->dev_addr;
1423         return 0;
1424 }
1425
1426 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1427 {
1428         if (dev->addr_len != INFINIBAND_ALEN)
1429                 return -1;
1430         memcpy(eui, dev->dev_addr + 12, 8);
1431         eui[0] |= 2;
1432         return 0;
1433 }
1434
1435 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1436 {
1437         switch (dev->type) {
1438         case ARPHRD_ETHER:
1439         case ARPHRD_FDDI:
1440         case ARPHRD_IEEE802_TR:
1441                 return addrconf_ifid_eui48(eui, dev);
1442         case ARPHRD_ARCNET:
1443                 return addrconf_ifid_arcnet(eui, dev);
1444         case ARPHRD_INFINIBAND:
1445                 return addrconf_ifid_infiniband(eui, dev);
1446         case ARPHRD_SIT:
1447                 if (dev->priv_flags & IFF_ISATAP)
1448                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1449         }
1450         return -1;
1451 }
1452
1453 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1454 {
1455         int err = -1;
1456         struct inet6_ifaddr *ifp;
1457
1458         read_lock_bh(&idev->lock);
1459         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1460                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1461                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1462                         err = 0;
1463                         break;
1464                 }
1465         }
1466         read_unlock_bh(&idev->lock);
1467         return err;
1468 }
1469
1470 #ifdef CONFIG_IPV6_PRIVACY
1471 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1472 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1473 {
1474 regen:
1475         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1476         idev->rndid[0] &= ~0x02;
1477
1478         /*
1479          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1480          * check if generated address is not inappropriate
1481          *
1482          *  - Reserved subnet anycast (RFC 2526)
1483          *      11111101 11....11 1xxxxxxx
1484          *  - ISATAP (RFC4214) 6.1
1485          *      00-00-5E-FE-xx-xx-xx-xx
1486          *  - value 0
1487          *  - XXX: already assigned to an address on the device
1488          */
1489         if (idev->rndid[0] == 0xfd &&
1490             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1491             (idev->rndid[7]&0x80))
1492                 goto regen;
1493         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1494                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1495                         goto regen;
1496                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1497                         goto regen;
1498         }
1499
1500         return 0;
1501 }
1502
1503 static void ipv6_regen_rndid(unsigned long data)
1504 {
1505         struct inet6_dev *idev = (struct inet6_dev *) data;
1506         unsigned long expires;
1507
1508         rcu_read_lock_bh();
1509         write_lock_bh(&idev->lock);
1510
1511         if (idev->dead)
1512                 goto out;
1513
1514         if (__ipv6_regen_rndid(idev) < 0)
1515                 goto out;
1516
1517         expires = jiffies +
1518                 idev->cnf.temp_prefered_lft * HZ -
1519                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1520         if (time_before(expires, jiffies)) {
1521                 printk(KERN_WARNING
1522                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1523                         idev->dev->name);
1524                 goto out;
1525         }
1526
1527         if (!mod_timer(&idev->regen_timer, expires))
1528                 in6_dev_hold(idev);
1529
1530 out:
1531         write_unlock_bh(&idev->lock);
1532         rcu_read_unlock_bh();
1533         in6_dev_put(idev);
1534 }
1535
1536 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1537         int ret = 0;
1538
1539         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1540                 ret = __ipv6_regen_rndid(idev);
1541         return ret;
1542 }
1543 #endif
1544
1545 /*
1546  *      Add prefix route.
1547  */
1548
1549 static void
1550 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1551                       unsigned long expires, u32 flags)
1552 {
1553         struct fib6_config cfg = {
1554                 .fc_table = RT6_TABLE_PREFIX,
1555                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1556                 .fc_ifindex = dev->ifindex,
1557                 .fc_expires = expires,
1558                 .fc_dst_len = plen,
1559                 .fc_flags = RTF_UP | flags,
1560                 .fc_nlinfo.nl_net = &init_net,
1561         };
1562
1563         ipv6_addr_copy(&cfg.fc_dst, pfx);
1564
1565         /* Prevent useless cloning on PtP SIT.
1566            This thing is done here expecting that the whole
1567            class of non-broadcast devices need not cloning.
1568          */
1569 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1570         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1571                 cfg.fc_flags |= RTF_NONEXTHOP;
1572 #endif
1573
1574         ip6_route_add(&cfg);
1575 }
1576
1577 /* Create "default" multicast route to the interface */
1578
1579 static void addrconf_add_mroute(struct net_device *dev)
1580 {
1581         struct fib6_config cfg = {
1582                 .fc_table = RT6_TABLE_LOCAL,
1583                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1584                 .fc_ifindex = dev->ifindex,
1585                 .fc_dst_len = 8,
1586                 .fc_flags = RTF_UP,
1587                 .fc_nlinfo.nl_net = &init_net,
1588         };
1589
1590         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1591
1592         ip6_route_add(&cfg);
1593 }
1594
1595 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1596 static void sit_route_add(struct net_device *dev)
1597 {
1598         struct fib6_config cfg = {
1599                 .fc_table = RT6_TABLE_MAIN,
1600                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1601                 .fc_ifindex = dev->ifindex,
1602                 .fc_dst_len = 96,
1603                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1604                 .fc_nlinfo.nl_net = &init_net,
1605         };
1606
1607         /* prefix length - 96 bits "::d.d.d.d" */
1608         ip6_route_add(&cfg);
1609 }
1610 #endif
1611
1612 static void addrconf_add_lroute(struct net_device *dev)
1613 {
1614         struct in6_addr addr;
1615
1616         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1617         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1618 }
1619
1620 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1621 {
1622         struct inet6_dev *idev;
1623
1624         ASSERT_RTNL();
1625
1626         if ((idev = ipv6_find_idev(dev)) == NULL)
1627                 return NULL;
1628
1629         /* Add default multicast route */
1630         addrconf_add_mroute(dev);
1631
1632         /* Add link local route */
1633         addrconf_add_lroute(dev);
1634         return idev;
1635 }
1636
1637 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1638 {
1639         struct prefix_info *pinfo;
1640         __u32 valid_lft;
1641         __u32 prefered_lft;
1642         int addr_type;
1643         unsigned long rt_expires;
1644         struct inet6_dev *in6_dev;
1645
1646         pinfo = (struct prefix_info *) opt;
1647
1648         if (len < sizeof(struct prefix_info)) {
1649                 ADBG(("addrconf: prefix option too short\n"));
1650                 return;
1651         }
1652
1653         /*
1654          *      Validation checks ([ADDRCONF], page 19)
1655          */
1656
1657         addr_type = ipv6_addr_type(&pinfo->prefix);
1658
1659         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1660                 return;
1661
1662         valid_lft = ntohl(pinfo->valid);
1663         prefered_lft = ntohl(pinfo->prefered);
1664
1665         if (prefered_lft > valid_lft) {
1666                 if (net_ratelimit())
1667                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1668                 return;
1669         }
1670
1671         in6_dev = in6_dev_get(dev);
1672
1673         if (in6_dev == NULL) {
1674                 if (net_ratelimit())
1675                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1676                 return;
1677         }
1678
1679         /*
1680          *      Two things going on here:
1681          *      1) Add routes for on-link prefixes
1682          *      2) Configure prefixes with the auto flag set
1683          */
1684
1685         /* Avoid arithmetic overflow. Really, we could
1686            save rt_expires in seconds, likely valid_lft,
1687            but it would require division in fib gc, that it
1688            not good.
1689          */
1690         if (valid_lft >= 0x7FFFFFFF/HZ)
1691                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1692         else
1693                 rt_expires = valid_lft * HZ;
1694
1695         /*
1696          * We convert this (in jiffies) to clock_t later.
1697          * Avoid arithmetic overflow there as well.
1698          * Overflow can happen only if HZ < USER_HZ.
1699          */
1700         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1701                 rt_expires = 0x7FFFFFFF / USER_HZ;
1702
1703         if (pinfo->onlink) {
1704                 struct rt6_info *rt;
1705                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1706
1707                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1708                         if (rt->rt6i_flags&RTF_EXPIRES) {
1709                                 if (valid_lft == 0) {
1710                                         ip6_del_rt(rt);
1711                                         rt = NULL;
1712                                 } else {
1713                                         rt->rt6i_expires = jiffies + rt_expires;
1714                                 }
1715                         }
1716                 } else if (valid_lft) {
1717                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1718                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1719                 }
1720                 if (rt)
1721                         dst_release(&rt->u.dst);
1722         }
1723
1724         /* Try to figure out our local address for this prefix */
1725
1726         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1727                 struct inet6_ifaddr * ifp;
1728                 struct in6_addr addr;
1729                 int create = 0, update_lft = 0;
1730
1731                 if (pinfo->prefix_len == 64) {
1732                         memcpy(&addr, &pinfo->prefix, 8);
1733                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1734                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1735                                 in6_dev_put(in6_dev);
1736                                 return;
1737                         }
1738                         goto ok;
1739                 }
1740                 if (net_ratelimit())
1741                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1742                                pinfo->prefix_len);
1743                 in6_dev_put(in6_dev);
1744                 return;
1745
1746 ok:
1747
1748                 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1749
1750                 if (ifp == NULL && valid_lft) {
1751                         int max_addresses = in6_dev->cnf.max_addresses;
1752                         u32 addr_flags = 0;
1753
1754 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1755                         if (in6_dev->cnf.optimistic_dad &&
1756                             !ipv6_devconf.forwarding)
1757                                 addr_flags = IFA_F_OPTIMISTIC;
1758 #endif
1759
1760                         /* Do not allow to create too much of autoconfigured
1761                          * addresses; this would be too easy way to crash kernel.
1762                          */
1763                         if (!max_addresses ||
1764                             ipv6_count_addresses(in6_dev) < max_addresses)
1765                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1766                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1767                                                     addr_flags);
1768
1769                         if (!ifp || IS_ERR(ifp)) {
1770                                 in6_dev_put(in6_dev);
1771                                 return;
1772                         }
1773
1774                         update_lft = create = 1;
1775                         ifp->cstamp = jiffies;
1776                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1777                 }
1778
1779                 if (ifp) {
1780                         int flags;
1781                         unsigned long now;
1782 #ifdef CONFIG_IPV6_PRIVACY
1783                         struct inet6_ifaddr *ift;
1784 #endif
1785                         u32 stored_lft;
1786
1787                         /* update lifetime (RFC2462 5.5.3 e) */
1788                         spin_lock(&ifp->lock);
1789                         now = jiffies;
1790                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1791                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1792                         else
1793                                 stored_lft = 0;
1794                         if (!update_lft && stored_lft) {
1795                                 if (valid_lft > MIN_VALID_LIFETIME ||
1796                                     valid_lft > stored_lft)
1797                                         update_lft = 1;
1798                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1799                                         /* valid_lft <= stored_lft is always true */
1800                                         /* XXX: IPsec */
1801                                         update_lft = 0;
1802                                 } else {
1803                                         valid_lft = MIN_VALID_LIFETIME;
1804                                         if (valid_lft < prefered_lft)
1805                                                 prefered_lft = valid_lft;
1806                                         update_lft = 1;
1807                                 }
1808                         }
1809
1810                         if (update_lft) {
1811                                 ifp->valid_lft = valid_lft;
1812                                 ifp->prefered_lft = prefered_lft;
1813                                 ifp->tstamp = now;
1814                                 flags = ifp->flags;
1815                                 ifp->flags &= ~IFA_F_DEPRECATED;
1816                                 spin_unlock(&ifp->lock);
1817
1818                                 if (!(flags&IFA_F_TENTATIVE))
1819                                         ipv6_ifa_notify(0, ifp);
1820                         } else
1821                                 spin_unlock(&ifp->lock);
1822
1823 #ifdef CONFIG_IPV6_PRIVACY
1824                         read_lock_bh(&in6_dev->lock);
1825                         /* update all temporary addresses in the list */
1826                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1827                                 /*
1828                                  * When adjusting the lifetimes of an existing
1829                                  * temporary address, only lower the lifetimes.
1830                                  * Implementations must not increase the
1831                                  * lifetimes of an existing temporary address
1832                                  * when processing a Prefix Information Option.
1833                                  */
1834                                 spin_lock(&ift->lock);
1835                                 flags = ift->flags;
1836                                 if (ift->valid_lft > valid_lft &&
1837                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1838                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1839                                 if (ift->prefered_lft > prefered_lft &&
1840                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1841                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1842                                 spin_unlock(&ift->lock);
1843                                 if (!(flags&IFA_F_TENTATIVE))
1844                                         ipv6_ifa_notify(0, ift);
1845                         }
1846
1847                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1848                                 /*
1849                                  * When a new public address is created as described in [ADDRCONF],
1850                                  * also create a new temporary address.
1851                                  */
1852                                 read_unlock_bh(&in6_dev->lock);
1853                                 ipv6_create_tempaddr(ifp, NULL);
1854                         } else {
1855                                 read_unlock_bh(&in6_dev->lock);
1856                         }
1857 #endif
1858                         in6_ifa_put(ifp);
1859                         addrconf_verify(0);
1860                 }
1861         }
1862         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1863         in6_dev_put(in6_dev);
1864 }
1865
1866 /*
1867  *      Set destination address.
1868  *      Special case for SIT interfaces where we create a new "virtual"
1869  *      device.
1870  */
1871 int addrconf_set_dstaddr(void __user *arg)
1872 {
1873         struct in6_ifreq ireq;
1874         struct net_device *dev;
1875         int err = -EINVAL;
1876
1877         rtnl_lock();
1878
1879         err = -EFAULT;
1880         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1881                 goto err_exit;
1882
1883         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1884
1885         err = -ENODEV;
1886         if (dev == NULL)
1887                 goto err_exit;
1888
1889 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1890         if (dev->type == ARPHRD_SIT) {
1891                 struct ifreq ifr;
1892                 mm_segment_t    oldfs;
1893                 struct ip_tunnel_parm p;
1894
1895                 err = -EADDRNOTAVAIL;
1896                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1897                         goto err_exit;
1898
1899                 memset(&p, 0, sizeof(p));
1900                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1901                 p.iph.saddr = 0;
1902                 p.iph.version = 4;
1903                 p.iph.ihl = 5;
1904                 p.iph.protocol = IPPROTO_IPV6;
1905                 p.iph.ttl = 64;
1906                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1907
1908                 oldfs = get_fs(); set_fs(KERNEL_DS);
1909                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1910                 set_fs(oldfs);
1911
1912                 if (err == 0) {
1913                         err = -ENOBUFS;
1914                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1915                                 goto err_exit;
1916                         err = dev_open(dev);
1917                 }
1918         }
1919 #endif
1920
1921 err_exit:
1922         rtnl_unlock();
1923         return err;
1924 }
1925
1926 /*
1927  *      Manual configuration of address on an interface
1928  */
1929 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1930                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1931 {
1932         struct inet6_ifaddr *ifp;
1933         struct inet6_dev *idev;
1934         struct net_device *dev;
1935         int scope;
1936         u32 flags = RTF_EXPIRES;
1937
1938         ASSERT_RTNL();
1939
1940         /* check the lifetime */
1941         if (!valid_lft || prefered_lft > valid_lft)
1942                 return -EINVAL;
1943
1944         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1945                 return -ENODEV;
1946
1947         if ((idev = addrconf_add_dev(dev)) == NULL)
1948                 return -ENOBUFS;
1949
1950         scope = ipv6_addr_scope(pfx);
1951
1952         if (valid_lft == INFINITY_LIFE_TIME) {
1953                 ifa_flags |= IFA_F_PERMANENT;
1954                 flags = 0;
1955         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1956                 valid_lft = 0x7FFFFFFF/HZ;
1957
1958         if (prefered_lft == 0)
1959                 ifa_flags |= IFA_F_DEPRECATED;
1960         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1961                  (prefered_lft != INFINITY_LIFE_TIME))
1962                 prefered_lft = 0x7FFFFFFF/HZ;
1963
1964         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1965
1966         if (!IS_ERR(ifp)) {
1967                 spin_lock_bh(&ifp->lock);
1968                 ifp->valid_lft = valid_lft;
1969                 ifp->prefered_lft = prefered_lft;
1970                 ifp->tstamp = jiffies;
1971                 spin_unlock_bh(&ifp->lock);
1972
1973                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1974                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1975                 /*
1976                  * Note that section 3.1 of RFC 4429 indicates
1977                  * that the Optimistic flag should not be set for
1978                  * manually configured addresses
1979                  */
1980                 addrconf_dad_start(ifp, 0);
1981                 in6_ifa_put(ifp);
1982                 addrconf_verify(0);
1983                 return 0;
1984         }
1985
1986         return PTR_ERR(ifp);
1987 }
1988
1989 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1990 {
1991         struct inet6_ifaddr *ifp;
1992         struct inet6_dev *idev;
1993         struct net_device *dev;
1994
1995         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1996                 return -ENODEV;
1997
1998         if ((idev = __in6_dev_get(dev)) == NULL)
1999                 return -ENXIO;
2000
2001         read_lock_bh(&idev->lock);
2002         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2003                 if (ifp->prefix_len == plen &&
2004                     ipv6_addr_equal(pfx, &ifp->addr)) {
2005                         in6_ifa_hold(ifp);
2006                         read_unlock_bh(&idev->lock);
2007
2008                         ipv6_del_addr(ifp);
2009
2010                         /* If the last address is deleted administratively,
2011                            disable IPv6 on this interface.
2012                          */
2013                         if (idev->addr_list == NULL)
2014                                 addrconf_ifdown(idev->dev, 1);
2015                         return 0;
2016                 }
2017         }
2018         read_unlock_bh(&idev->lock);
2019         return -EADDRNOTAVAIL;
2020 }
2021
2022
2023 int addrconf_add_ifaddr(void __user *arg)
2024 {
2025         struct in6_ifreq ireq;
2026         int err;
2027
2028         if (!capable(CAP_NET_ADMIN))
2029                 return -EPERM;
2030
2031         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2032                 return -EFAULT;
2033
2034         rtnl_lock();
2035         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2036                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2037         rtnl_unlock();
2038         return err;
2039 }
2040
2041 int addrconf_del_ifaddr(void __user *arg)
2042 {
2043         struct in6_ifreq ireq;
2044         int err;
2045
2046         if (!capable(CAP_NET_ADMIN))
2047                 return -EPERM;
2048
2049         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2050                 return -EFAULT;
2051
2052         rtnl_lock();
2053         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2054         rtnl_unlock();
2055         return err;
2056 }
2057
2058 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2059 static void sit_add_v4_addrs(struct inet6_dev *idev)
2060 {
2061         struct inet6_ifaddr * ifp;
2062         struct in6_addr addr;
2063         struct net_device *dev;
2064         int scope;
2065
2066         ASSERT_RTNL();
2067
2068         memset(&addr, 0, sizeof(struct in6_addr));
2069         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2070
2071         if (idev->dev->flags&IFF_POINTOPOINT) {
2072                 addr.s6_addr32[0] = htonl(0xfe800000);
2073                 scope = IFA_LINK;
2074         } else {
2075                 scope = IPV6_ADDR_COMPATv4;
2076         }
2077
2078         if (addr.s6_addr32[3]) {
2079                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2080                 if (!IS_ERR(ifp)) {
2081                         spin_lock_bh(&ifp->lock);
2082                         ifp->flags &= ~IFA_F_TENTATIVE;
2083                         spin_unlock_bh(&ifp->lock);
2084                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2085                         in6_ifa_put(ifp);
2086                 }
2087                 return;
2088         }
2089
2090         for_each_netdev(&init_net, dev) {
2091                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2092                 if (in_dev && (dev->flags & IFF_UP)) {
2093                         struct in_ifaddr * ifa;
2094
2095                         int flag = scope;
2096
2097                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2098                                 int plen;
2099
2100                                 addr.s6_addr32[3] = ifa->ifa_local;
2101
2102                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2103                                         continue;
2104                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2105                                         if (idev->dev->flags&IFF_POINTOPOINT)
2106                                                 continue;
2107                                         flag |= IFA_HOST;
2108                                 }
2109                                 if (idev->dev->flags&IFF_POINTOPOINT)
2110                                         plen = 64;
2111                                 else
2112                                         plen = 96;
2113
2114                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2115                                                     IFA_F_PERMANENT);
2116                                 if (!IS_ERR(ifp)) {
2117                                         spin_lock_bh(&ifp->lock);
2118                                         ifp->flags &= ~IFA_F_TENTATIVE;
2119                                         spin_unlock_bh(&ifp->lock);
2120                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2121                                         in6_ifa_put(ifp);
2122                                 }
2123                         }
2124                 }
2125         }
2126 }
2127 #endif
2128
2129 static void init_loopback(struct net_device *dev)
2130 {
2131         struct inet6_dev  *idev;
2132         struct inet6_ifaddr * ifp;
2133
2134         /* ::1 */
2135
2136         ASSERT_RTNL();
2137
2138         if ((idev = ipv6_find_idev(dev)) == NULL) {
2139                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2140                 return;
2141         }
2142
2143         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2144         if (!IS_ERR(ifp)) {
2145                 spin_lock_bh(&ifp->lock);
2146                 ifp->flags &= ~IFA_F_TENTATIVE;
2147                 spin_unlock_bh(&ifp->lock);
2148                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2149                 in6_ifa_put(ifp);
2150         }
2151 }
2152
2153 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2154 {
2155         struct inet6_ifaddr * ifp;
2156         u32 addr_flags = IFA_F_PERMANENT;
2157
2158 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2159         if (idev->cnf.optimistic_dad &&
2160             !ipv6_devconf.forwarding)
2161                 addr_flags |= IFA_F_OPTIMISTIC;
2162 #endif
2163
2164
2165         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2166         if (!IS_ERR(ifp)) {
2167                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2168                 addrconf_dad_start(ifp, 0);
2169                 in6_ifa_put(ifp);
2170         }
2171 }
2172
2173 static void addrconf_dev_config(struct net_device *dev)
2174 {
2175         struct in6_addr addr;
2176         struct inet6_dev    * idev;
2177
2178         ASSERT_RTNL();
2179
2180         if ((dev->type != ARPHRD_ETHER) &&
2181             (dev->type != ARPHRD_FDDI) &&
2182             (dev->type != ARPHRD_IEEE802_TR) &&
2183             (dev->type != ARPHRD_ARCNET) &&
2184             (dev->type != ARPHRD_INFINIBAND)) {
2185                 /* Alas, we support only Ethernet autoconfiguration. */
2186                 return;
2187         }
2188
2189         idev = addrconf_add_dev(dev);
2190         if (idev == NULL)
2191                 return;
2192
2193         memset(&addr, 0, sizeof(struct in6_addr));
2194         addr.s6_addr32[0] = htonl(0xFE800000);
2195
2196         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2197                 addrconf_add_linklocal(idev, &addr);
2198 }
2199
2200 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2201 static void addrconf_sit_config(struct net_device *dev)
2202 {
2203         struct inet6_dev *idev;
2204
2205         ASSERT_RTNL();
2206
2207         /*
2208          * Configure the tunnel with one of our IPv4
2209          * addresses... we should configure all of
2210          * our v4 addrs in the tunnel
2211          */
2212
2213         if ((idev = ipv6_find_idev(dev)) == NULL) {
2214                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2215                 return;
2216         }
2217
2218         if (dev->priv_flags & IFF_ISATAP) {
2219                 struct in6_addr addr;
2220
2221                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2222                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2223                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2224                         addrconf_add_linklocal(idev, &addr);
2225                 return;
2226         }
2227
2228         sit_add_v4_addrs(idev);
2229
2230         if (dev->flags&IFF_POINTOPOINT) {
2231                 addrconf_add_mroute(dev);
2232                 addrconf_add_lroute(dev);
2233         } else
2234                 sit_route_add(dev);
2235 }
2236 #endif
2237
2238 static inline int
2239 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2240 {
2241         struct in6_addr lladdr;
2242
2243         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2244                 addrconf_add_linklocal(idev, &lladdr);
2245                 return 0;
2246         }
2247         return -1;
2248 }
2249
2250 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2251 {
2252         struct net_device *link_dev;
2253
2254         /* first try to inherit the link-local address from the link device */
2255         if (idev->dev->iflink &&
2256             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2257                 if (!ipv6_inherit_linklocal(idev, link_dev))
2258                         return;
2259         }
2260         /* then try to inherit it from any device */
2261         for_each_netdev(&init_net, link_dev) {
2262                 if (!ipv6_inherit_linklocal(idev, link_dev))
2263                         return;
2264         }
2265         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2266 }
2267
2268 /*
2269  * Autoconfigure tunnel with a link-local address so routing protocols,
2270  * DHCPv6, MLD etc. can be run over the virtual link
2271  */
2272
2273 static void addrconf_ip6_tnl_config(struct net_device *dev)
2274 {
2275         struct inet6_dev *idev;
2276
2277         ASSERT_RTNL();
2278
2279         if ((idev = addrconf_add_dev(dev)) == NULL) {
2280                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2281                 return;
2282         }
2283         ip6_tnl_add_linklocal(idev);
2284 }
2285
2286 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2287                            void * data)
2288 {
2289         struct net_device *dev = (struct net_device *) data;
2290         struct inet6_dev *idev = __in6_dev_get(dev);
2291         int run_pending = 0;
2292         int err;
2293
2294         if (dev->nd_net != &init_net)
2295                 return NOTIFY_DONE;
2296
2297         switch(event) {
2298         case NETDEV_REGISTER:
2299                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2300                         idev = ipv6_add_dev(dev);
2301                         if (!idev)
2302                                 return notifier_from_errno(-ENOMEM);
2303                 }
2304                 break;
2305         case NETDEV_UP:
2306         case NETDEV_CHANGE:
2307                 if (dev->flags & IFF_SLAVE)
2308                         break;
2309
2310                 if (event == NETDEV_UP) {
2311                         if (!addrconf_qdisc_ok(dev)) {
2312                                 /* device is not ready yet. */
2313                                 printk(KERN_INFO
2314                                         "ADDRCONF(NETDEV_UP): %s: "
2315                                         "link is not ready\n",
2316                                         dev->name);
2317                                 break;
2318                         }
2319
2320                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2321                                 idev = ipv6_add_dev(dev);
2322
2323                         if (idev)
2324                                 idev->if_flags |= IF_READY;
2325                 } else {
2326                         if (!addrconf_qdisc_ok(dev)) {
2327                                 /* device is still not ready. */
2328                                 break;
2329                         }
2330
2331                         if (idev) {
2332                                 if (idev->if_flags & IF_READY) {
2333                                         /* device is already configured. */
2334                                         break;
2335                                 }
2336                                 idev->if_flags |= IF_READY;
2337                         }
2338
2339                         printk(KERN_INFO
2340                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2341                                         "link becomes ready\n",
2342                                         dev->name);
2343
2344                         run_pending = 1;
2345                 }
2346
2347                 switch(dev->type) {
2348 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2349                 case ARPHRD_SIT:
2350                         addrconf_sit_config(dev);
2351                         break;
2352 #endif
2353                 case ARPHRD_TUNNEL6:
2354                         addrconf_ip6_tnl_config(dev);
2355                         break;
2356                 case ARPHRD_LOOPBACK:
2357                         init_loopback(dev);
2358                         break;
2359
2360                 default:
2361                         addrconf_dev_config(dev);
2362                         break;
2363                 }
2364                 if (idev) {
2365                         if (run_pending)
2366                                 addrconf_dad_run(idev);
2367
2368                         /* If the MTU changed during the interface down, when the
2369                            interface up, the changed MTU must be reflected in the
2370                            idev as well as routers.
2371                          */
2372                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2373                                 rt6_mtu_change(dev, dev->mtu);
2374                                 idev->cnf.mtu6 = dev->mtu;
2375                         }
2376                         idev->tstamp = jiffies;
2377                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2378                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2379                            stop IPv6 on this interface.
2380                          */
2381                         if (dev->mtu < IPV6_MIN_MTU)
2382                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2383                 }
2384                 break;
2385
2386         case NETDEV_CHANGEMTU:
2387                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2388                         rt6_mtu_change(dev, dev->mtu);
2389                         idev->cnf.mtu6 = dev->mtu;
2390                         break;
2391                 }
2392
2393                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2394                         idev = ipv6_add_dev(dev);
2395                         if (idev)
2396                                 break;
2397                 }
2398
2399                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2400
2401         case NETDEV_DOWN:
2402         case NETDEV_UNREGISTER:
2403                 /*
2404                  *      Remove all addresses from this interface.
2405                  */
2406                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2407                 break;
2408
2409         case NETDEV_CHANGENAME:
2410                 if (idev) {
2411                         snmp6_unregister_dev(idev);
2412                         addrconf_sysctl_unregister(idev);
2413                         addrconf_sysctl_register(idev);
2414                         err = snmp6_register_dev(idev);
2415                         if (err)
2416                                 return notifier_from_errno(err);
2417                 }
2418                 break;
2419         }
2420
2421         return NOTIFY_OK;
2422 }
2423
2424 /*
2425  *      addrconf module should be notified of a device going up
2426  */
2427 static struct notifier_block ipv6_dev_notf = {
2428         .notifier_call = addrconf_notify,
2429         .priority = 0
2430 };
2431
2432 static int addrconf_ifdown(struct net_device *dev, int how)
2433 {
2434         struct inet6_dev *idev;
2435         struct inet6_ifaddr *ifa, **bifa;
2436         int i;
2437
2438         ASSERT_RTNL();
2439
2440         if (dev == init_net.loopback_dev && how == 1)
2441                 how = 0;
2442
2443         rt6_ifdown(dev);
2444         neigh_ifdown(&nd_tbl, dev);
2445
2446         idev = __in6_dev_get(dev);
2447         if (idev == NULL)
2448                 return -ENODEV;
2449
2450         /* Step 1: remove reference to ipv6 device from parent device.
2451                    Do not dev_put!
2452          */
2453         if (how == 1) {
2454                 idev->dead = 1;
2455
2456                 /* protected by rtnl_lock */
2457                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2458
2459                 /* Step 1.5: remove snmp6 entry */
2460                 snmp6_unregister_dev(idev);
2461
2462         }
2463
2464         /* Step 2: clear hash table */
2465         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2466                 bifa = &inet6_addr_lst[i];
2467
2468                 write_lock_bh(&addrconf_hash_lock);
2469                 while ((ifa = *bifa) != NULL) {
2470                         if (ifa->idev == idev) {
2471                                 *bifa = ifa->lst_next;
2472                                 ifa->lst_next = NULL;
2473                                 addrconf_del_timer(ifa);
2474                                 in6_ifa_put(ifa);
2475                                 continue;
2476                         }
2477                         bifa = &ifa->lst_next;
2478                 }
2479                 write_unlock_bh(&addrconf_hash_lock);
2480         }
2481
2482         write_lock_bh(&idev->lock);
2483
2484         /* Step 3: clear flags for stateless addrconf */
2485         if (how != 1)
2486                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2487
2488         /* Step 4: clear address list */
2489 #ifdef CONFIG_IPV6_PRIVACY
2490         if (how == 1 && del_timer(&idev->regen_timer))
2491                 in6_dev_put(idev);
2492
2493         /* clear tempaddr list */
2494         while ((ifa = idev->tempaddr_list) != NULL) {
2495                 idev->tempaddr_list = ifa->tmp_next;
2496                 ifa->tmp_next = NULL;
2497                 ifa->dead = 1;
2498                 write_unlock_bh(&idev->lock);
2499                 spin_lock_bh(&ifa->lock);
2500
2501                 if (ifa->ifpub) {
2502                         in6_ifa_put(ifa->ifpub);
2503                         ifa->ifpub = NULL;
2504                 }
2505                 spin_unlock_bh(&ifa->lock);
2506                 in6_ifa_put(ifa);
2507                 write_lock_bh(&idev->lock);
2508         }
2509 #endif
2510         while ((ifa = idev->addr_list) != NULL) {
2511                 idev->addr_list = ifa->if_next;
2512                 ifa->if_next = NULL;
2513                 ifa->dead = 1;
2514                 addrconf_del_timer(ifa);
2515                 write_unlock_bh(&idev->lock);
2516
2517                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2518                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2519                 in6_ifa_put(ifa);
2520
2521                 write_lock_bh(&idev->lock);
2522         }
2523         write_unlock_bh(&idev->lock);
2524
2525         /* Step 5: Discard multicast list */
2526
2527         if (how == 1)
2528                 ipv6_mc_destroy_dev(idev);
2529         else
2530                 ipv6_mc_down(idev);
2531
2532         idev->tstamp = jiffies;
2533
2534         /* Shot the device (if unregistered) */
2535
2536         if (how == 1) {
2537                 addrconf_sysctl_unregister(idev);
2538                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2539                 neigh_ifdown(&nd_tbl, dev);
2540                 in6_dev_put(idev);
2541         }
2542         return 0;
2543 }
2544
2545 static void addrconf_rs_timer(unsigned long data)
2546 {
2547         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2548
2549         if (ifp->idev->cnf.forwarding)
2550                 goto out;
2551
2552         if (ifp->idev->if_flags & IF_RA_RCVD) {
2553                 /*
2554                  *      Announcement received after solicitation
2555                  *      was sent
2556                  */
2557                 goto out;
2558         }
2559
2560         spin_lock(&ifp->lock);
2561         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2562                 struct in6_addr all_routers;
2563
2564                 /* The wait after the last probe can be shorter */
2565                 addrconf_mod_timer(ifp, AC_RS,
2566                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2567                                    ifp->idev->cnf.rtr_solicit_delay :
2568                                    ifp->idev->cnf.rtr_solicit_interval);
2569                 spin_unlock(&ifp->lock);
2570
2571                 ipv6_addr_all_routers(&all_routers);
2572
2573                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2574         } else {
2575                 spin_unlock(&ifp->lock);
2576                 /*
2577                  * Note: we do not support deprecated "all on-link"
2578                  * assumption any longer.
2579                  */
2580                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2581                        ifp->idev->dev->name);
2582         }
2583
2584 out:
2585         in6_ifa_put(ifp);
2586 }
2587
2588 /*
2589  *      Duplicate Address Detection
2590  */
2591 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2592 {
2593         unsigned long rand_num;
2594         struct inet6_dev *idev = ifp->idev;
2595
2596         if (ifp->flags & IFA_F_OPTIMISTIC)
2597                 rand_num = 0;
2598         else
2599                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2600
2601         ifp->probes = idev->cnf.dad_transmits;
2602         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2603 }
2604
2605 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2606 {
2607         struct inet6_dev *idev = ifp->idev;
2608         struct net_device *dev = idev->dev;
2609
2610         addrconf_join_solict(dev, &ifp->addr);
2611
2612         net_srandom(ifp->addr.s6_addr32[3]);
2613
2614         read_lock_bh(&idev->lock);
2615         if (ifp->dead)
2616                 goto out;
2617         spin_lock_bh(&ifp->lock);
2618
2619         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2620             !(ifp->flags&IFA_F_TENTATIVE) ||
2621             ifp->flags & IFA_F_NODAD) {
2622                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2623                 spin_unlock_bh(&ifp->lock);
2624                 read_unlock_bh(&idev->lock);
2625
2626                 addrconf_dad_completed(ifp);
2627                 return;
2628         }
2629
2630         if (!(idev->if_flags & IF_READY)) {
2631                 spin_unlock_bh(&ifp->lock);
2632                 read_unlock_bh(&idev->lock);
2633                 /*
2634                  * If the defice is not ready:
2635                  * - keep it tentative if it is a permanent address.
2636                  * - otherwise, kill it.
2637                  */
2638                 in6_ifa_hold(ifp);
2639                 addrconf_dad_stop(ifp);
2640                 return;
2641         }
2642
2643         /*
2644          * Optimistic nodes can start receiving
2645          * Frames right away
2646          */
2647         if(ifp->flags & IFA_F_OPTIMISTIC)
2648                 ip6_ins_rt(ifp->rt);
2649
2650         addrconf_dad_kick(ifp);
2651         spin_unlock_bh(&ifp->lock);
2652 out:
2653         read_unlock_bh(&idev->lock);
2654 }
2655
2656 static void addrconf_dad_timer(unsigned long data)
2657 {
2658         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2659         struct inet6_dev *idev = ifp->idev;
2660         struct in6_addr unspec;
2661         struct in6_addr mcaddr;
2662
2663         read_lock_bh(&idev->lock);
2664         if (idev->dead) {
2665                 read_unlock_bh(&idev->lock);
2666                 goto out;
2667         }
2668         spin_lock_bh(&ifp->lock);
2669         if (ifp->probes == 0) {
2670                 /*
2671                  * DAD was successful
2672                  */
2673
2674                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2675                 spin_unlock_bh(&ifp->lock);
2676                 read_unlock_bh(&idev->lock);
2677
2678                 addrconf_dad_completed(ifp);
2679
2680                 goto out;
2681         }
2682
2683         ifp->probes--;
2684         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2685         spin_unlock_bh(&ifp->lock);
2686         read_unlock_bh(&idev->lock);
2687
2688         /* send a neighbour solicitation for our addr */
2689         memset(&unspec, 0, sizeof(unspec));
2690         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2691         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2692 out:
2693         in6_ifa_put(ifp);
2694 }
2695
2696 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2697 {
2698         struct net_device *     dev = ifp->idev->dev;
2699
2700         /*
2701          *      Configure the address for reception. Now it is valid.
2702          */
2703
2704         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2705
2706         /* If added prefix is link local and forwarding is off,
2707            start sending router solicitations.
2708          */
2709
2710         if (ifp->idev->cnf.forwarding == 0 &&
2711             ifp->idev->cnf.rtr_solicits > 0 &&
2712             (dev->flags&IFF_LOOPBACK) == 0 &&
2713             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2714                 struct in6_addr all_routers;
2715
2716                 ipv6_addr_all_routers(&all_routers);
2717
2718                 /*
2719                  *      If a host as already performed a random delay
2720                  *      [...] as part of DAD [...] there is no need
2721                  *      to delay again before sending the first RS
2722                  */
2723                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2724
2725                 spin_lock_bh(&ifp->lock);
2726                 ifp->probes = 1;
2727                 ifp->idev->if_flags |= IF_RS_SENT;
2728                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2729                 spin_unlock_bh(&ifp->lock);
2730         }
2731 }
2732
2733 static void addrconf_dad_run(struct inet6_dev *idev) {
2734         struct inet6_ifaddr *ifp;
2735
2736         read_lock_bh(&idev->lock);
2737         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2738                 spin_lock_bh(&ifp->lock);
2739                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2740                         spin_unlock_bh(&ifp->lock);
2741                         continue;
2742                 }
2743                 spin_unlock_bh(&ifp->lock);
2744                 addrconf_dad_kick(ifp);
2745         }
2746         read_unlock_bh(&idev->lock);
2747 }
2748
2749 #ifdef CONFIG_PROC_FS
2750 struct if6_iter_state {
2751         struct seq_net_private p;
2752         int bucket;
2753 };
2754
2755 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2756 {
2757         struct inet6_ifaddr *ifa = NULL;
2758         struct if6_iter_state *state = seq->private;
2759         struct net *net = state->p.net;
2760
2761         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2762                 ifa = inet6_addr_lst[state->bucket];
2763
2764                 while (ifa && ifa->idev->dev->nd_net != net)
2765                         ifa = ifa->lst_next;
2766                 if (ifa)
2767                         break;
2768         }
2769         return ifa;
2770 }
2771
2772 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2773 {
2774         struct if6_iter_state *state = seq->private;
2775         struct net *net = state->p.net;
2776
2777         ifa = ifa->lst_next;
2778 try_again:
2779         if (ifa) {
2780                 if (ifa->idev->dev->nd_net != net) {
2781                         ifa = ifa->lst_next;
2782                         goto try_again;
2783                 }
2784         }
2785
2786         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2787                 ifa = inet6_addr_lst[state->bucket];
2788                 goto try_again;
2789         }
2790
2791         return ifa;
2792 }
2793
2794 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2795 {
2796         struct inet6_ifaddr *ifa = if6_get_first(seq);
2797
2798         if (ifa)
2799                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2800                         --pos;
2801         return pos ? NULL : ifa;
2802 }
2803
2804 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2805         __acquires(addrconf_hash_lock)
2806 {
2807         read_lock_bh(&addrconf_hash_lock);
2808         return if6_get_idx(seq, *pos);
2809 }
2810
2811 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2812 {
2813         struct inet6_ifaddr *ifa;
2814
2815         ifa = if6_get_next(seq, v);
2816         ++*pos;
2817         return ifa;
2818 }
2819
2820 static void if6_seq_stop(struct seq_file *seq, void *v)
2821         __releases(addrconf_hash_lock)
2822 {
2823         read_unlock_bh(&addrconf_hash_lock);
2824 }
2825
2826 static int if6_seq_show(struct seq_file *seq, void *v)
2827 {
2828         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2829         seq_printf(seq,
2830                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2831                    NIP6(ifp->addr),
2832                    ifp->idev->dev->ifindex,
2833                    ifp->prefix_len,
2834                    ifp->scope,
2835                    ifp->flags,
2836                    ifp->idev->dev->name);
2837         return 0;
2838 }
2839
2840 static const struct seq_operations if6_seq_ops = {
2841         .start  = if6_seq_start,
2842         .next   = if6_seq_next,
2843         .show   = if6_seq_show,
2844         .stop   = if6_seq_stop,
2845 };
2846
2847 static int if6_seq_open(struct inode *inode, struct file *file)
2848 {
2849         return seq_open_net(inode, file, &if6_seq_ops,
2850                             sizeof(struct if6_iter_state));
2851 }
2852
2853 static const struct file_operations if6_fops = {
2854         .owner          = THIS_MODULE,
2855         .open           = if6_seq_open,
2856         .read           = seq_read,
2857         .llseek         = seq_lseek,
2858         .release        = seq_release_net,
2859 };
2860
2861 static int if6_proc_net_init(struct net *net)
2862 {
2863         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2864                 return -ENOMEM;
2865         return 0;
2866 }
2867
2868 static void if6_proc_net_exit(struct net *net)
2869 {
2870        proc_net_remove(net, "if_inet6");
2871 }
2872
2873 static struct pernet_operations if6_proc_net_ops = {
2874        .init = if6_proc_net_init,
2875        .exit = if6_proc_net_exit,
2876 };
2877
2878 int __init if6_proc_init(void)
2879 {
2880         return register_pernet_subsys(&if6_proc_net_ops);
2881 }
2882
2883 void if6_proc_exit(void)
2884 {
2885         unregister_pernet_subsys(&if6_proc_net_ops);
2886 }
2887 #endif  /* CONFIG_PROC_FS */
2888
2889 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2890 /* Check if address is a home address configured on any interface. */
2891 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2892 {
2893         int ret = 0;
2894         struct inet6_ifaddr * ifp;
2895         u8 hash = ipv6_addr_hash(addr);
2896         read_lock_bh(&addrconf_hash_lock);
2897         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2898                 if (ifp->idev->dev->nd_net != net)
2899                         continue;
2900                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2901                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2902                         ret = 1;
2903                         break;
2904                 }
2905         }
2906         read_unlock_bh(&addrconf_hash_lock);
2907         return ret;
2908 }
2909 #endif
2910
2911 /*
2912  *      Periodic address status verification
2913  */
2914
2915 static void addrconf_verify(unsigned long foo)
2916 {
2917         struct inet6_ifaddr *ifp;
2918         unsigned long now, next;
2919         int i;
2920
2921         spin_lock_bh(&addrconf_verify_lock);
2922         now = jiffies;
2923         next = now + ADDR_CHECK_FREQUENCY;
2924
2925         del_timer(&addr_chk_timer);
2926
2927         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2928
2929 restart:
2930                 read_lock(&addrconf_hash_lock);
2931                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2932                         unsigned long age;
2933 #ifdef CONFIG_IPV6_PRIVACY
2934                         unsigned long regen_advance;
2935 #endif
2936
2937                         if (ifp->flags & IFA_F_PERMANENT)
2938                                 continue;
2939
2940                         spin_lock(&ifp->lock);
2941                         age = (now - ifp->tstamp) / HZ;
2942
2943 #ifdef CONFIG_IPV6_PRIVACY
2944                         regen_advance = ifp->idev->cnf.regen_max_retry *
2945                                         ifp->idev->cnf.dad_transmits *
2946                                         ifp->idev->nd_parms->retrans_time / HZ;
2947 #endif
2948
2949                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2950                             age >= ifp->valid_lft) {
2951                                 spin_unlock(&ifp->lock);
2952                                 in6_ifa_hold(ifp);
2953                                 read_unlock(&addrconf_hash_lock);
2954                                 ipv6_del_addr(ifp);
2955                                 goto restart;
2956                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2957                                 spin_unlock(&ifp->lock);
2958                                 continue;
2959                         } else if (age >= ifp->prefered_lft) {
2960                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2961                                 int deprecate = 0;
2962
2963                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2964                                         deprecate = 1;
2965                                         ifp->flags |= IFA_F_DEPRECATED;
2966                                 }
2967
2968                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2969                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2970
2971                                 spin_unlock(&ifp->lock);
2972
2973                                 if (deprecate) {
2974                                         in6_ifa_hold(ifp);
2975                                         read_unlock(&addrconf_hash_lock);
2976
2977                                         ipv6_ifa_notify(0, ifp);
2978                                         in6_ifa_put(ifp);
2979                                         goto restart;
2980                                 }
2981 #ifdef CONFIG_IPV6_PRIVACY
2982                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2983                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2984                                 if (age >= ifp->prefered_lft - regen_advance) {
2985                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2986                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2987                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2988                                         if (!ifp->regen_count && ifpub) {
2989                                                 ifp->regen_count++;
2990                                                 in6_ifa_hold(ifp);
2991                                                 in6_ifa_hold(ifpub);
2992                                                 spin_unlock(&ifp->lock);
2993                                                 read_unlock(&addrconf_hash_lock);
2994                                                 spin_lock(&ifpub->lock);
2995                                                 ifpub->regen_count = 0;
2996                                                 spin_unlock(&ifpub->lock);
2997                                                 ipv6_create_tempaddr(ifpub, ifp);
2998                                                 in6_ifa_put(ifpub);
2999                                                 in6_ifa_put(ifp);
3000                                                 goto restart;
3001                                         }
3002                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3003                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3004                                 spin_unlock(&ifp->lock);
3005 #endif
3006                         } else {
3007                                 /* ifp->prefered_lft <= ifp->valid_lft */
3008                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3009                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3010                                 spin_unlock(&ifp->lock);
3011                         }
3012                 }
3013                 read_unlock(&addrconf_hash_lock);
3014         }
3015
3016         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3017         add_timer(&addr_chk_timer);
3018         spin_unlock_bh(&addrconf_verify_lock);
3019 }
3020
3021 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3022 {
3023         struct in6_addr *pfx = NULL;
3024
3025         if (addr)
3026                 pfx = nla_data(addr);
3027
3028         if (local) {
3029                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3030                         pfx = NULL;
3031                 else
3032                         pfx = nla_data(local);
3033         }
3034
3035         return pfx;
3036 }
3037
3038 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3039         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3040         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3041         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3042 };
3043
3044 static int
3045 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3046 {
3047         struct net *net = skb->sk->sk_net;
3048         struct ifaddrmsg *ifm;
3049         struct nlattr *tb[IFA_MAX+1];
3050         struct in6_addr *pfx;
3051         int err;
3052
3053         if (net != &init_net)
3054                 return -EINVAL;
3055
3056         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3057         if (err < 0)
3058                 return err;
3059
3060         ifm = nlmsg_data(nlh);
3061         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3062         if (pfx == NULL)
3063                 return -EINVAL;
3064
3065         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3066 }
3067
3068 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3069                              u32 prefered_lft, u32 valid_lft)
3070 {
3071         u32 flags = RTF_EXPIRES;
3072
3073         if (!valid_lft || (prefered_lft > valid_lft))
3074                 return -EINVAL;
3075
3076         if (valid_lft == INFINITY_LIFE_TIME) {
3077                 ifa_flags |= IFA_F_PERMANENT;
3078                 flags = 0;
3079         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3080                 valid_lft = 0x7FFFFFFF/HZ;
3081
3082         if (prefered_lft == 0)
3083                 ifa_flags |= IFA_F_DEPRECATED;
3084         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3085                  (prefered_lft != INFINITY_LIFE_TIME))
3086                 prefered_lft = 0x7FFFFFFF/HZ;
3087
3088         spin_lock_bh(&ifp->lock);
3089         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3090         ifp->tstamp = jiffies;
3091         ifp->valid_lft = valid_lft;
3092         ifp->prefered_lft = prefered_lft;
3093
3094         spin_unlock_bh(&ifp->lock);
3095         if (!(ifp->flags&IFA_F_TENTATIVE))
3096                 ipv6_ifa_notify(0, ifp);
3097
3098         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3099                               jiffies_to_clock_t(valid_lft * HZ), flags);
3100         addrconf_verify(0);
3101
3102         return 0;
3103 }
3104
3105 static int
3106 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3107 {
3108         struct net *net = skb->sk->sk_net;
3109         struct ifaddrmsg *ifm;
3110         struct nlattr *tb[IFA_MAX+1];
3111         struct in6_addr *pfx;
3112         struct inet6_ifaddr *ifa;
3113         struct net_device *dev;
3114         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3115         u8 ifa_flags;
3116         int err;
3117
3118         if (net != &init_net)
3119                 return -EINVAL;
3120
3121         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3122         if (err < 0)
3123                 return err;
3124
3125         ifm = nlmsg_data(nlh);
3126         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3127         if (pfx == NULL)
3128                 return -EINVAL;
3129
3130         if (tb[IFA_CACHEINFO]) {
3131                 struct ifa_cacheinfo *ci;
3132
3133                 ci = nla_data(tb[IFA_CACHEINFO]);
3134                 valid_lft = ci->ifa_valid;
3135                 preferred_lft = ci->ifa_prefered;
3136         } else {
3137                 preferred_lft = INFINITY_LIFE_TIME;
3138                 valid_lft = INFINITY_LIFE_TIME;
3139         }
3140
3141         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3142         if (dev == NULL)
3143                 return -ENODEV;
3144
3145         /* We ignore other flags so far. */
3146         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3147
3148         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3149         if (ifa == NULL) {
3150                 /*
3151                  * It would be best to check for !NLM_F_CREATE here but
3152                  * userspace alreay relies on not having to provide this.
3153                  */
3154                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3155                                       ifa_flags, preferred_lft, valid_lft);
3156         }
3157
3158         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3159             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3160                 err = -EEXIST;
3161         else
3162                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3163
3164         in6_ifa_put(ifa);
3165
3166         return err;
3167 }
3168
3169 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3170                           u8 scope, int ifindex)
3171 {
3172         struct ifaddrmsg *ifm;
3173
3174         ifm = nlmsg_data(nlh);
3175         ifm->ifa_family = AF_INET6;
3176         ifm->ifa_prefixlen = prefixlen;
3177         ifm->ifa_flags = flags;
3178         ifm->ifa_scope = scope;
3179         ifm->ifa_index = ifindex;
3180 }
3181
3182 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3183                          unsigned long tstamp, u32 preferred, u32 valid)
3184 {
3185         struct ifa_cacheinfo ci;
3186
3187         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3188                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3189         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3190                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3191         ci.ifa_prefered = preferred;
3192         ci.ifa_valid = valid;
3193
3194         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3195 }
3196
3197 static inline int rt_scope(int ifa_scope)
3198 {
3199         if (ifa_scope & IFA_HOST)
3200                 return RT_SCOPE_HOST;
3201         else if (ifa_scope & IFA_LINK)
3202                 return RT_SCOPE_LINK;
3203         else if (ifa_scope & IFA_SITE)
3204                 return RT_SCOPE_SITE;
3205         else
3206                 return RT_SCOPE_UNIVERSE;
3207 }
3208
3209 static inline int inet6_ifaddr_msgsize(void)
3210 {
3211         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3212                + nla_total_size(16) /* IFA_ADDRESS */
3213                + nla_total_size(sizeof(struct ifa_cacheinfo));
3214 }
3215
3216 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3217                              u32 pid, u32 seq, int event, unsigned int flags)
3218 {
3219         struct nlmsghdr  *nlh;
3220         u32 preferred, valid;
3221
3222         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3223         if (nlh == NULL)
3224                 return -EMSGSIZE;
3225
3226         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3227                       ifa->idev->dev->ifindex);
3228
3229         if (!(ifa->flags&IFA_F_PERMANENT)) {
3230                 preferred = ifa->prefered_lft;
3231                 valid = ifa->valid_lft;
3232                 if (preferred != INFINITY_LIFE_TIME) {
3233                         long tval = (jiffies - ifa->tstamp)/HZ;
3234                         preferred -= tval;
3235                         if (valid != INFINITY_LIFE_TIME)
3236                                 valid -= tval;
3237                 }
3238         } else {
3239                 preferred = INFINITY_LIFE_TIME;
3240                 valid = INFINITY_LIFE_TIME;
3241         }
3242
3243         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3244             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3245                 nlmsg_cancel(skb, nlh);
3246                 return -EMSGSIZE;
3247         }
3248
3249         return nlmsg_end(skb, nlh);
3250 }
3251
3252 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3253                                 u32 pid, u32 seq, int event, u16 flags)
3254 {
3255         struct nlmsghdr  *nlh;
3256         u8 scope = RT_SCOPE_UNIVERSE;
3257         int ifindex = ifmca->idev->dev->ifindex;
3258
3259         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3260                 scope = RT_SCOPE_SITE;
3261
3262         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3263         if (nlh == NULL)
3264                 return -EMSGSIZE;
3265
3266         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3267         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3268             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3269                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3270                 nlmsg_cancel(skb, nlh);
3271                 return -EMSGSIZE;
3272         }
3273
3274         return nlmsg_end(skb, nlh);
3275 }
3276
3277 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3278                                 u32 pid, u32 seq, int event, unsigned int flags)
3279 {
3280         struct nlmsghdr  *nlh;
3281         u8 scope = RT_SCOPE_UNIVERSE;
3282         int ifindex = ifaca->aca_idev->dev->ifindex;
3283
3284         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3285                 scope = RT_SCOPE_SITE;
3286
3287         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3288         if (nlh == NULL)
3289                 return -EMSGSIZE;
3290
3291         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3292         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3293             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3294                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3295                 nlmsg_cancel(skb, nlh);
3296                 return -EMSGSIZE;
3297         }
3298
3299         return nlmsg_end(skb, nlh);
3300 }
3301
3302 enum addr_type_t
3303 {
3304         UNICAST_ADDR,
3305         MULTICAST_ADDR,
3306         ANYCAST_ADDR,
3307 };
3308
3309 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3310                            enum addr_type_t type)
3311 {
3312         int idx, ip_idx;
3313         int s_idx, s_ip_idx;
3314         int err = 1;
3315         struct net_device *dev;
3316         struct inet6_dev *idev = NULL;
3317         struct inet6_ifaddr *ifa;
3318         struct ifmcaddr6 *ifmca;
3319         struct ifacaddr6 *ifaca;
3320
3321         s_idx = cb->args[0];
3322         s_ip_idx = ip_idx = cb->args[1];
3323
3324         idx = 0;
3325         for_each_netdev(&init_net, dev) {
3326                 if (idx < s_idx)
3327                         goto cont;
3328                 if (idx > s_idx)
3329                         s_ip_idx = 0;
3330                 ip_idx = 0;
3331                 if ((idev = in6_dev_get(dev)) == NULL)
3332                         goto cont;
3333                 read_lock_bh(&idev->lock);
3334                 switch (type) {
3335                 case UNICAST_ADDR:
3336                         /* unicast address incl. temp addr */
3337                         for (ifa = idev->addr_list; ifa;
3338                              ifa = ifa->if_next, ip_idx++) {
3339                                 if (ip_idx < s_ip_idx)
3340                                         continue;
3341                                 err = inet6_fill_ifaddr(skb, ifa,
3342                                                         NETLINK_CB(cb->skb).pid,
3343                                                         cb->nlh->nlmsg_seq,
3344                                                         RTM_NEWADDR,
3345                                                         NLM_F_MULTI);
3346                         }
3347                         break;
3348                 case MULTICAST_ADDR:
3349                         /* multicast address */
3350                         for (ifmca = idev->mc_list; ifmca;
3351                              ifmca = ifmca->next, ip_idx++) {
3352                                 if (ip_idx < s_ip_idx)
3353                                         continue;
3354                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3355                                                           NETLINK_CB(cb->skb).pid,
3356                                                           cb->nlh->nlmsg_seq,
3357                                                           RTM_GETMULTICAST,
3358                                                           NLM_F_MULTI);
3359                         }
3360                         break;
3361                 case ANYCAST_ADDR:
3362                         /* anycast address */
3363                         for (ifaca = idev->ac_list; ifaca;
3364                              ifaca = ifaca->aca_next, ip_idx++) {
3365                                 if (ip_idx < s_ip_idx)
3366                                         continue;
3367                                 err = inet6_fill_ifacaddr(skb, ifaca,
3368                                                           NETLINK_CB(cb->skb).pid,
3369                                                           cb->nlh->nlmsg_seq,
3370                                                           RTM_GETANYCAST,
3371                                                           NLM_F_MULTI);
3372                         }
3373                         break;
3374                 default:
3375                         break;
3376                 }
3377                 read_unlock_bh(&idev->lock);
3378                 in6_dev_put(idev);
3379
3380                 if (err <= 0)
3381                         break;
3382 cont:
3383                 idx++;
3384         }
3385         cb->args[0] = idx;
3386         cb->args[1] = ip_idx;
3387         return skb->len;
3388 }
3389
3390 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3391 {
3392         struct net *net = skb->sk->sk_net;
3393         enum addr_type_t type = UNICAST_ADDR;
3394
3395         if (net != &init_net)
3396                 return 0;
3397
3398         return inet6_dump_addr(skb, cb, type);
3399 }
3400
3401 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3402 {
3403         struct net *net = skb->sk->sk_net;
3404         enum addr_type_t type = MULTICAST_ADDR;
3405
3406         if (net != &init_net)
3407                 return 0;
3408
3409         return inet6_dump_addr(skb, cb, type);
3410 }
3411
3412
3413 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3414 {
3415         struct net *net = skb->sk->sk_net;
3416         enum addr_type_t type = ANYCAST_ADDR;
3417
3418         if (net != &init_net)
3419                 return 0;
3420
3421         return inet6_dump_addr(skb, cb, type);
3422 }
3423
3424 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3425                              void *arg)
3426 {
3427         struct net *net = in_skb->sk->sk_net;
3428         struct ifaddrmsg *ifm;
3429         struct nlattr *tb[IFA_MAX+1];
3430         struct in6_addr *addr = NULL;
3431         struct net_device *dev = NULL;
3432         struct inet6_ifaddr *ifa;
3433         struct sk_buff *skb;
3434         int err;
3435
3436         if (net != &init_net)
3437                 return -EINVAL;
3438
3439         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3440         if (err < 0)
3441                 goto errout;
3442
3443         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3444         if (addr == NULL) {
3445                 err = -EINVAL;
3446                 goto errout;
3447         }
3448
3449         ifm = nlmsg_data(nlh);
3450         if (ifm->ifa_index)
3451                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3452
3453         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3454                 err = -EADDRNOTAVAIL;
3455                 goto errout;
3456         }
3457
3458         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3459                 err = -ENOBUFS;
3460                 goto errout_ifa;
3461         }
3462
3463         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3464                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3465         if (err < 0) {
3466                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3467                 WARN_ON(err == -EMSGSIZE);
3468                 kfree_skb(skb);
3469                 goto errout_ifa;
3470         }
3471         err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3472 errout_ifa:
3473         in6_ifa_put(ifa);
3474 errout:
3475         return err;
3476 }
3477
3478 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3479 {
3480         struct sk_buff *skb;
3481         int err = -ENOBUFS;
3482
3483         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3484         if (skb == NULL)
3485                 goto errout;
3486
3487         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3488         if (err < 0) {
3489                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3490                 WARN_ON(err == -EMSGSIZE);
3491                 kfree_skb(skb);
3492                 goto errout;
3493         }
3494         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3495 errout:
3496         if (err < 0)
3497                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3498 }
3499
3500 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3501                                 __s32 *array, int bytes)
3502 {
3503         BUG_ON(bytes < (DEVCONF_MAX * 4));
3504
3505         memset(array, 0, bytes);
3506         array[DEVCONF_FORWARDING] = cnf->forwarding;
3507         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3508         array[DEVCONF_MTU6] = cnf->mtu6;
3509         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3510         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3511         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3512         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3513         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3514         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3515         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3516         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3517 #ifdef CONFIG_IPV6_PRIVACY
3518         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3519         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3520         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3521         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3522         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3523 #endif
3524         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3525         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3526         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3527 #ifdef CONFIG_IPV6_ROUTER_PREF
3528         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3529         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3530 #ifdef CONFIG_IPV6_ROUTE_INFO
3531         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3532 #endif
3533 #endif
3534         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3535         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3536 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3537         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3538 #endif
3539 }
3540
3541 static inline size_t inet6_if_nlmsg_size(void)
3542 {
3543         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3544                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3545                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3546                + nla_total_size(4) /* IFLA_MTU */
3547                + nla_total_size(4) /* IFLA_LINK */
3548                + nla_total_size( /* IFLA_PROTINFO */
3549                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3550                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3551                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3552                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3553                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3554                  );
3555 }
3556
3557 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3558                                       int bytes)
3559 {
3560         int i;
3561         int pad = bytes - sizeof(u64) * items;
3562         BUG_ON(pad < 0);
3563
3564         /* Use put_unaligned() because stats may not be aligned for u64. */
3565         put_unaligned(items, &stats[0]);
3566         for (i = 1; i < items; i++)
3567                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3568
3569         memset(&stats[items], 0, pad);
3570 }
3571
3572 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3573                              int bytes)
3574 {
3575         switch(attrtype) {
3576         case IFLA_INET6_STATS:
3577                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3578                 break;
3579         case IFLA_INET6_ICMP6STATS:
3580                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3581                 break;
3582         }
3583 }
3584
3585 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3586                              u32 pid, u32 seq, int event, unsigned int flags)
3587 {
3588         struct net_device *dev = idev->dev;
3589         struct nlattr *nla;
3590         struct ifinfomsg *hdr;
3591         struct nlmsghdr *nlh;
3592         void *protoinfo;
3593         struct ifla_cacheinfo ci;
3594
3595         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3596         if (nlh == NULL)
3597                 return -EMSGSIZE;
3598
3599         hdr = nlmsg_data(nlh);
3600         hdr->ifi_family = AF_INET6;
3601         hdr->__ifi_pad = 0;
3602         hdr->ifi_type = dev->type;
3603         hdr->ifi_index = dev->ifindex;
3604         hdr->ifi_flags = dev_get_flags(dev);
3605         hdr->ifi_change = 0;
3606
3607         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3608
3609         if (dev->addr_len)
3610                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3611
3612         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3613         if (dev->ifindex != dev->iflink)
3614                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3615
3616         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3617         if (protoinfo == NULL)
3618                 goto nla_put_failure;
3619
3620         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3621
3622         ci.max_reasm_len = IPV6_MAXPLEN;
3623         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3624                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3625         ci.reachable_time = idev->nd_parms->reachable_time;
3626         ci.retrans_time = idev->nd_parms->retrans_time;
3627         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3628
3629         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3630         if (nla == NULL)
3631                 goto nla_put_failure;
3632         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3633
3634         /* XXX - MC not implemented */
3635
3636         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3637         if (nla == NULL)
3638                 goto nla_put_failure;
3639         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3640
3641         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3642         if (nla == NULL)
3643                 goto nla_put_failure;
3644         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3645
3646         nla_nest_end(skb, protoinfo);
3647         return nlmsg_end(skb, nlh);
3648
3649 nla_put_failure:
3650         nlmsg_cancel(skb, nlh);
3651         return -EMSGSIZE;
3652 }
3653
3654 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3655 {
3656         struct net *net = skb->sk->sk_net;
3657         int idx, err;
3658         int s_idx = cb->args[0];
3659         struct net_device *dev;
3660         struct inet6_dev *idev;
3661
3662         if (net != &init_net)
3663                 return 0;
3664
3665         read_lock(&dev_base_lock);
3666         idx = 0;
3667         for_each_netdev(&init_net, dev) {
3668                 if (idx < s_idx)
3669                         goto cont;
3670                 if ((idev = in6_dev_get(dev)) == NULL)
3671                         goto cont;
3672                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3673                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3674                 in6_dev_put(idev);
3675                 if (err <= 0)
3676                         break;
3677 cont:
3678                 idx++;
3679         }
3680         read_unlock(&dev_base_lock);
3681         cb->args[0] = idx;
3682
3683         return skb->len;
3684 }
3685
3686 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3687 {
3688         struct sk_buff *skb;
3689         int err = -ENOBUFS;
3690
3691         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3692         if (skb == NULL)
3693                 goto errout;
3694
3695         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3696         if (err < 0) {
3697                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3698                 WARN_ON(err == -EMSGSIZE);
3699                 kfree_skb(skb);
3700                 goto errout;
3701         }
3702         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3703 errout:
3704         if (err < 0)
3705                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3706 }
3707
3708 static inline size_t inet6_prefix_nlmsg_size(void)
3709 {
3710         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3711                + nla_total_size(sizeof(struct in6_addr))
3712                + nla_total_size(sizeof(struct prefix_cacheinfo));
3713 }
3714
3715 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3716                              struct prefix_info *pinfo, u32 pid, u32 seq,
3717                              int event, unsigned int flags)
3718 {
3719         struct prefixmsg *pmsg;
3720         struct nlmsghdr *nlh;
3721         struct prefix_cacheinfo ci;
3722
3723         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3724         if (nlh == NULL)
3725                 return -EMSGSIZE;
3726
3727         pmsg = nlmsg_data(nlh);
3728         pmsg->prefix_family = AF_INET6;
3729         pmsg->prefix_pad1 = 0;
3730         pmsg->prefix_pad2 = 0;
3731         pmsg->prefix_ifindex = idev->dev->ifindex;
3732         pmsg->prefix_len = pinfo->prefix_len;
3733         pmsg->prefix_type = pinfo->type;
3734         pmsg->prefix_pad3 = 0;
3735         pmsg->prefix_flags = 0;
3736         if (pinfo->onlink)
3737                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3738         if (pinfo->autoconf)
3739                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3740
3741         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3742
3743         ci.preferred_time = ntohl(pinfo->prefered);
3744         ci.valid_time = ntohl(pinfo->valid);
3745         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3746
3747         return nlmsg_end(skb, nlh);
3748
3749 nla_put_failure:
3750         nlmsg_cancel(skb, nlh);
3751         return -EMSGSIZE;
3752 }
3753
3754 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3755                          struct prefix_info *pinfo)
3756 {
3757         struct sk_buff *skb;
3758         int err = -ENOBUFS;
3759
3760         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3761         if (skb == NULL)
3762                 goto errout;
3763
3764         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3765         if (err < 0) {
3766                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3767                 WARN_ON(err == -EMSGSIZE);
3768                 kfree_skb(skb);
3769                 goto errout;
3770         }
3771         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3772 errout:
3773         if (err < 0)
3774                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3775 }
3776
3777 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3778 {
3779         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3780
3781         switch (event) {
3782         case RTM_NEWADDR:
3783                 /*
3784                  * If the address was optimistic
3785                  * we inserted the route at the start of
3786                  * our DAD process, so we don't need
3787                  * to do it again
3788                  */
3789                 if (!(ifp->rt->rt6i_node))
3790                         ip6_ins_rt(ifp->rt);
3791                 if (ifp->idev->cnf.forwarding)
3792                         addrconf_join_anycast(ifp);
3793                 break;
3794         case RTM_DELADDR:
3795                 if (ifp->idev->cnf.forwarding)
3796                         addrconf_leave_anycast(ifp);
3797                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3798                 dst_hold(&ifp->rt->u.dst);
3799                 if (ip6_del_rt(ifp->rt))
3800                         dst_free(&ifp->rt->u.dst);
3801                 break;
3802         }
3803 }
3804
3805 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3806 {
3807         rcu_read_lock_bh();
3808         if (likely(ifp->idev->dead == 0))
3809                 __ipv6_ifa_notify(event, ifp);
3810         rcu_read_unlock_bh();
3811 }
3812
3813 #ifdef CONFIG_SYSCTL
3814
3815 static
3816 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3817                            void __user *buffer, size_t *lenp, loff_t *ppos)
3818 {
3819         int *valp = ctl->data;
3820         int val = *valp;
3821         int ret;
3822
3823         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3824
3825         if (write)
3826                 addrconf_fixup_forwarding(ctl, valp, val);
3827         return ret;
3828 }
3829
3830 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3831                                             int __user *name, int nlen,
3832                                             void __user *oldval,
3833                                             size_t __user *oldlenp,
3834                                             void __user *newval, size_t newlen)
3835 {
3836         int *valp = table->data;
3837         int val = *valp;
3838         int new;
3839
3840         if (!newval || !newlen)
3841                 return 0;
3842         if (newlen != sizeof(int))
3843                 return -EINVAL;
3844         if (get_user(new, (int __user *)newval))
3845                 return -EFAULT;
3846         if (new == *valp)
3847                 return 0;
3848         if (oldval && oldlenp) {
3849                 size_t len;
3850                 if (get_user(len, oldlenp))
3851                         return -EFAULT;
3852                 if (len) {
3853                         if (len > table->maxlen)
3854                                 len = table->maxlen;
3855                         if (copy_to_user(oldval, valp, len))
3856                                 return -EFAULT;
3857                         if (put_user(len, oldlenp))
3858                                 return -EFAULT;
3859                 }
3860         }
3861
3862         *valp = new;
3863         addrconf_fixup_forwarding(table, valp, val);
3864         return 1;
3865 }
3866
3867 static struct addrconf_sysctl_table
3868 {
3869         struct ctl_table_header *sysctl_header;
3870         ctl_table addrconf_vars[__NET_IPV6_MAX];
3871         char *dev_name;
3872 } addrconf_sysctl __read_mostly = {
3873         .sysctl_header = NULL,
3874         .addrconf_vars = {
3875                 {
3876                         .ctl_name       =       NET_IPV6_FORWARDING,
3877                         .procname       =       "forwarding",
3878                         .data           =       &ipv6_devconf.forwarding,
3879                         .maxlen         =       sizeof(int),
3880                         .mode           =       0644,
3881                         .proc_handler   =       &addrconf_sysctl_forward,
3882                         .strategy       =       &addrconf_sysctl_forward_strategy,
3883                 },
3884                 {
3885                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3886                         .procname       =       "hop_limit",
3887                         .data           =       &ipv6_devconf.hop_limit,
3888                         .maxlen         =       sizeof(int),
3889                         .mode           =       0644,
3890                         .proc_handler   =       proc_dointvec,
3891                 },
3892                 {
3893                         .ctl_name       =       NET_IPV6_MTU,
3894                         .procname       =       "mtu",
3895                         .data           =       &ipv6_devconf.mtu6,
3896                         .maxlen         =       sizeof(int),
3897                         .mode           =       0644,
3898                         .proc_handler   =       &proc_dointvec,
3899                 },
3900                 {
3901                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3902                         .procname       =       "accept_ra",
3903                         .data           =       &ipv6_devconf.accept_ra,
3904                         .maxlen         =       sizeof(int),
3905                         .mode           =       0644,
3906                         .proc_handler   =       &proc_dointvec,
3907                 },
3908                 {
3909                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3910                         .procname       =       "accept_redirects",
3911                         .data           =       &ipv6_devconf.accept_redirects,
3912                         .maxlen         =       sizeof(int),
3913                         .mode           =       0644,
3914                         .proc_handler   =       &proc_dointvec,
3915                 },
3916                 {
3917                         .ctl_name       =       NET_IPV6_AUTOCONF,
3918                         .procname       =       "autoconf",
3919                         .data           =       &ipv6_devconf.autoconf,
3920                         .maxlen         =       sizeof(int),
3921                         .mode           =       0644,
3922                         .proc_handler   =       &proc_dointvec,
3923                 },
3924                 {
3925                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3926                         .procname       =       "dad_transmits",
3927                         .data           =       &ipv6_devconf.dad_transmits,
3928                         .maxlen         =       sizeof(int),
3929                         .mode           =       0644,
3930                         .proc_handler   =       &proc_dointvec,
3931                 },
3932                 {
3933                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3934                         .procname       =       "router_solicitations",
3935                         .data           =       &ipv6_devconf.rtr_solicits,
3936                         .maxlen         =       sizeof(int),
3937                         .mode           =       0644,
3938                         .proc_handler   =       &proc_dointvec,
3939                 },
3940                 {
3941                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3942                         .procname       =       "router_solicitation_interval",
3943                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3944                         .maxlen         =       sizeof(int),
3945                         .mode           =       0644,
3946                         .proc_handler   =       &proc_dointvec_jiffies,
3947                         .strategy       =       &sysctl_jiffies,
3948                 },
3949                 {
3950                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3951                         .procname       =       "router_solicitation_delay",
3952                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3953                         .maxlen         =       sizeof(int),
3954                         .mode           =       0644,
3955                         .proc_handler   =       &proc_dointvec_jiffies,
3956                         .strategy       =       &sysctl_jiffies,
3957                 },
3958                 {
3959                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3960                         .procname       =       "force_mld_version",
3961                         .data           =       &ipv6_devconf.force_mld_version,
3962                         .maxlen         =       sizeof(int),
3963                         .mode           =       0644,
3964                         .proc_handler   =       &proc_dointvec,
3965                 },
3966 #ifdef CONFIG_IPV6_PRIVACY
3967                 {
3968                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3969                         .procname       =       "use_tempaddr",
3970                         .data           =       &ipv6_devconf.use_tempaddr,
3971                         .maxlen         =       sizeof(int),
3972                         .mode           =       0644,
3973                         .proc_handler   =       &proc_dointvec,
3974                 },
3975                 {
3976                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3977                         .procname       =       "temp_valid_lft",
3978                         .data           =       &ipv6_devconf.temp_valid_lft,
3979                         .maxlen         =       sizeof(int),
3980                         .mode           =       0644,
3981                         .proc_handler   =       &proc_dointvec,
3982                 },
3983                 {
3984                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3985                         .procname       =       "temp_prefered_lft",
3986                         .data           =       &ipv6_devconf.temp_prefered_lft,
3987                         .maxlen         =       sizeof(int),
3988                         .mode           =       0644,
3989                         .proc_handler   =       &proc_dointvec,
3990                 },
3991                 {
3992                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3993                         .procname       =       "regen_max_retry",
3994                         .data           =       &ipv6_devconf.regen_max_retry,
3995                         .maxlen         =       sizeof(int),
3996                         .mode           =       0644,
3997                         .proc_handler   =       &proc_dointvec,
3998                 },
3999                 {
4000                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4001                         .procname       =       "max_desync_factor",
4002                         .data           =       &ipv6_devconf.max_desync_factor,
4003                         .maxlen         =       sizeof(int),
4004                         .mode           =       0644,
4005                         .proc_handler   =       &proc_dointvec,
4006                 },
4007 #endif
4008                 {
4009                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4010                         .procname       =       "max_addresses",
4011                         .data           =       &ipv6_devconf.max_addresses,
4012                         .maxlen         =       sizeof(int),
4013                         .mode           =       0644,
4014                         .proc_handler   =       &proc_dointvec,
4015                 },
4016                 {
4017                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4018                         .procname       =       "accept_ra_defrtr",
4019                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4020                         .maxlen         =       sizeof(int),
4021                         .mode           =       0644,
4022                         .proc_handler   =       &proc_dointvec,
4023                 },
4024                 {
4025                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4026                         .procname       =       "accept_ra_pinfo",
4027                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4028                         .maxlen         =       sizeof(int),
4029                         .mode           =       0644,
4030                         .proc_handler   =       &proc_dointvec,
4031                 },
4032 #ifdef CONFIG_IPV6_ROUTER_PREF
4033                 {
4034                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4035                         .procname       =       "accept_ra_rtr_pref",
4036                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4037                         .maxlen         =       sizeof(int),
4038                         .mode           =       0644,
4039                         .proc_handler   =       &proc_dointvec,
4040                 },
4041                 {
4042                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4043                         .procname       =       "router_probe_interval",
4044                         .data           =       &ipv6_devconf.rtr_probe_interval,
4045                         .maxlen         =       sizeof(int),
4046                         .mode           =       0644,
4047                         .proc_handler   =       &proc_dointvec_jiffies,
4048                         .strategy       =       &sysctl_jiffies,
4049                 },
4050 #ifdef CONFIG_IPV6_ROUTE_INFO
4051                 {
4052                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4053                         .procname       =       "accept_ra_rt_info_max_plen",
4054                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4055                         .maxlen         =       sizeof(int),
4056                         .mode           =       0644,
4057                         .proc_handler   =       &proc_dointvec,
4058                 },
4059 #endif
4060 #endif
4061                 {
4062                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4063                         .procname       =       "proxy_ndp",
4064                         .data           =       &ipv6_devconf.proxy_ndp,
4065                         .maxlen         =       sizeof(int),
4066                         .mode           =       0644,
4067                         .proc_handler   =       &proc_dointvec,
4068                 },
4069                 {
4070                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4071                         .procname       =       "accept_source_route",
4072                         .data           =       &ipv6_devconf.accept_source_route,
4073                         .maxlen         =       sizeof(int),
4074                         .mode           =       0644,
4075                         .proc_handler   =       &proc_dointvec,
4076                 },
4077 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4078                 {
4079                         .ctl_name       =       CTL_UNNUMBERED,
4080                         .procname       =       "optimistic_dad",
4081                         .data           =       &ipv6_devconf.optimistic_dad,
4082                         .maxlen         =       sizeof(int),
4083                         .mode           =       0644,
4084                         .proc_handler   =       &proc_dointvec,
4085
4086                 },
4087 #endif
4088                 {
4089                         .ctl_name       =       0,      /* sentinel */
4090                 }
4091         },
4092 };
4093
4094 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4095                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4096 {
4097         int i;
4098         struct addrconf_sysctl_table *t;
4099
4100 #define ADDRCONF_CTL_PATH_DEV   3
4101
4102         struct ctl_path addrconf_ctl_path[] = {
4103                 { .procname = "net", .ctl_name = CTL_NET, },
4104                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4105                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4106                 { /* to be set */ },
4107                 { },
4108         };
4109
4110
4111         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4112         if (t == NULL)
4113                 goto out;
4114
4115         for (i=0; t->addrconf_vars[i].data; i++) {
4116                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4117                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4118                 t->addrconf_vars[i].extra2 = net;
4119         }
4120
4121         /*
4122          * Make a copy of dev_name, because '.procname' is regarded as const
4123          * by sysctl and we wouldn't want anyone to change it under our feet
4124          * (see SIOCSIFNAME).
4125          */
4126         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4127         if (!t->dev_name)
4128                 goto free;
4129
4130         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4131         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4132
4133         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4134                         t->addrconf_vars);
4135         if (t->sysctl_header == NULL)
4136                 goto free_procname;
4137
4138         p->sysctl = t;
4139         return 0;
4140
4141 free_procname:
4142         kfree(t->dev_name);
4143 free:
4144         kfree(t);
4145 out:
4146         return -ENOBUFS;
4147 }
4148
4149 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4150 {
4151         struct addrconf_sysctl_table *t;
4152
4153         if (p->sysctl == NULL)
4154                 return;
4155
4156         t = p->sysctl;
4157         p->sysctl = NULL;
4158         unregister_sysctl_table(t->sysctl_header);
4159         kfree(t->dev_name);
4160         kfree(t);
4161 }
4162
4163 static void addrconf_sysctl_register(struct inet6_dev *idev)
4164 {
4165         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4166                               NET_IPV6_NEIGH, "ipv6",
4167                               &ndisc_ifinfo_sysctl_change,
4168                               NULL);
4169         __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4170                         idev->dev->ifindex, idev, &idev->cnf);
4171 }
4172
4173 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4174 {
4175         __addrconf_sysctl_unregister(&idev->cnf);
4176         neigh_sysctl_unregister(idev->nd_parms);
4177 }
4178
4179
4180 #endif
4181
4182 static int addrconf_init_net(struct net *net)
4183 {
4184         int err;
4185         struct ipv6_devconf *all, *dflt;
4186
4187         err = -ENOMEM;
4188         all = &ipv6_devconf;
4189         dflt = &ipv6_devconf_dflt;
4190
4191         if (net != &init_net) {
4192                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4193                 if (all == NULL)
4194                         goto err_alloc_all;
4195
4196                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4197                 if (dflt == NULL)
4198                         goto err_alloc_dflt;
4199         }
4200
4201         net->ipv6.devconf_all = all;
4202         net->ipv6.devconf_dflt = dflt;
4203
4204 #ifdef CONFIG_SYSCTL
4205         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4206                         NULL, all);
4207         if (err < 0)
4208                 goto err_reg_all;
4209
4210         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4211                         NULL, dflt);
4212         if (err < 0)
4213                 goto err_reg_dflt;
4214 #endif
4215         return 0;
4216
4217 #ifdef CONFIG_SYSCTL
4218 err_reg_dflt:
4219         __addrconf_sysctl_unregister(all);
4220 err_reg_all:
4221         kfree(dflt);
4222 #endif
4223 err_alloc_dflt:
4224         kfree(all);
4225 err_alloc_all:
4226         return err;
4227 }
4228
4229 static void addrconf_exit_net(struct net *net)
4230 {
4231 #ifdef CONFIG_SYSCTL
4232         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4233         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4234 #endif
4235         if (net != &init_net) {
4236                 kfree(net->ipv6.devconf_dflt);
4237                 kfree(net->ipv6.devconf_all);
4238         }
4239 }
4240
4241 static struct pernet_operations addrconf_ops = {
4242         .init = addrconf_init_net,
4243         .exit = addrconf_exit_net,
4244 };
4245
4246 /*
4247  *      Device notifier
4248  */
4249
4250 int register_inet6addr_notifier(struct notifier_block *nb)
4251 {
4252         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4253 }
4254
4255 EXPORT_SYMBOL(register_inet6addr_notifier);
4256
4257 int unregister_inet6addr_notifier(struct notifier_block *nb)
4258 {
4259         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4260 }
4261
4262 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4263
4264 /*
4265  *      Init / cleanup code
4266  */
4267
4268 int __init addrconf_init(void)
4269 {
4270         int err;
4271
4272         if ((err = ipv6_addr_label_init()) < 0) {
4273                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4274                         err);
4275                 return err;
4276         }
4277
4278         register_pernet_subsys(&addrconf_ops);
4279
4280         /* The addrconf netdev notifier requires that loopback_dev
4281          * has it's ipv6 private information allocated and setup
4282          * before it can bring up and give link-local addresses
4283          * to other devices which are up.
4284          *
4285          * Unfortunately, loopback_dev is not necessarily the first
4286          * entry in the global dev_base list of net devices.  In fact,
4287          * it is likely to be the very last entry on that list.
4288          * So this causes the notifier registry below to try and
4289          * give link-local addresses to all devices besides loopback_dev
4290          * first, then loopback_dev, which cases all the non-loopback_dev
4291          * devices to fail to get a link-local address.
4292          *
4293          * So, as a temporary fix, allocate the ipv6 structure for
4294          * loopback_dev first by hand.
4295          * Longer term, all of the dependencies ipv6 has upon the loopback
4296          * device and it being up should be removed.
4297          */
4298         rtnl_lock();
4299         if (!ipv6_add_dev(init_net.loopback_dev))
4300                 err = -ENOMEM;
4301         rtnl_unlock();
4302         if (err)
4303                 goto errlo;
4304
4305         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4306         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4307 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4308         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4309         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4310         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4311         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4312 #endif
4313
4314         register_netdevice_notifier(&ipv6_dev_notf);
4315
4316         addrconf_verify(0);
4317
4318         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4319         if (err < 0)
4320                 goto errout;
4321
4322         /* Only the first call to __rtnl_register can fail */
4323         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4324         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4325         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4326         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4327         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4328
4329         ipv6_addr_label_rtnl_register();
4330
4331         return 0;
4332 errout:
4333         unregister_netdevice_notifier(&ipv6_dev_notf);
4334 errlo:
4335         unregister_pernet_subsys(&addrconf_ops);
4336
4337         return err;
4338 }
4339
4340 void addrconf_cleanup(void)
4341 {
4342         struct net_device *dev;
4343         struct inet6_ifaddr *ifa;
4344         int i;
4345
4346         unregister_netdevice_notifier(&ipv6_dev_notf);
4347
4348         unregister_pernet_subsys(&addrconf_ops);
4349
4350         rtnl_lock();
4351
4352         /*
4353          *      clean dev list.
4354          */
4355
4356         for_each_netdev(&init_net, dev) {
4357                 if (__in6_dev_get(dev) == NULL)
4358                         continue;
4359                 addrconf_ifdown(dev, 1);
4360         }
4361         addrconf_ifdown(init_net.loopback_dev, 2);
4362
4363         /*
4364          *      Check hash table.
4365          */
4366
4367         write_lock_bh(&addrconf_hash_lock);
4368         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4369                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4370                         struct inet6_ifaddr *bifa;
4371
4372                         bifa = ifa;
4373                         ifa = ifa->lst_next;
4374                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4375                         /* Do not free it; something is wrong.
4376                            Now we can investigate it with debugger.
4377                          */
4378                 }
4379         }
4380         write_unlock_bh(&addrconf_hash_lock);
4381
4382         del_timer(&addr_chk_timer);
4383
4384         rtnl_unlock();
4385 }