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

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/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, struct ipv6_devconf *p);
 105 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 106 #endif
 107
 108 #ifdef CONFIG_IPV6_PRIVACY
 109 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 110 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 111 static void ipv6_regen_rndid(unsigned long data);
 112
 113 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 114 #endif
 115
 116 static int ipv6_count_addresses(struct inet6_dev *idev);
 117
 118 /*
 119  *      Configured unicast address hash table
 120  */
 121 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 122 static DEFINE_RWLOCK(addrconf_hash_lock);
 123
 124 static void addrconf_verify(unsigned long);
 125
 126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 127 static DEFINE_SPINLOCK(addrconf_verify_lock);
 128
 129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 131
 132 static int addrconf_ifdown(struct net_device *dev, int how);
 133
 134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 135 static void addrconf_dad_timer(unsigned long data);
 136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 137 static void addrconf_dad_run(struct inet6_dev *idev);
 138 static void addrconf_rs_timer(unsigned long data);
 139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 141
 142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 143                                 struct prefix_info *pinfo);
 144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 145
 146 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 147
 148 struct ipv6_devconf ipv6_devconf __read_mostly = {
 149         .forwarding             = 0,
 150         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 151         .mtu6                   = IPV6_MIN_MTU,
 152         .accept_ra              = 1,
 153         .accept_redirects       = 1,
 154         .autoconf               = 1,
 155         .force_mld_version      = 0,
 156         .dad_transmits          = 1,
 157         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 158         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 159         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 160 #ifdef CONFIG_IPV6_PRIVACY
 161         .use_tempaddr           = 0,
 162         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 163         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 164         .regen_max_retry        = REGEN_MAX_RETRY,
 165         .max_desync_factor      = MAX_DESYNC_FACTOR,
 166 #endif
 167         .max_addresses          = IPV6_MAX_ADDRESSES,
 168         .accept_ra_defrtr       = 1,
 169         .accept_ra_pinfo        = 1,
 170 #ifdef CONFIG_IPV6_ROUTER_PREF
 171         .accept_ra_rtr_pref     = 1,
 172         .rtr_probe_interval     = 60 * HZ,
 173 #ifdef CONFIG_IPV6_ROUTE_INFO
 174         .accept_ra_rt_info_max_plen = 0,
 175 #endif
 176 #endif
 177         .proxy_ndp              = 0,
 178         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 179 };
 180
 181 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 182         .forwarding             = 0,
 183         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 184         .mtu6                   = IPV6_MIN_MTU,
 185         .accept_ra              = 1,
 186         .accept_redirects       = 1,
 187         .autoconf               = 1,
 188         .dad_transmits          = 1,
 189         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 190         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 191         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 192 #ifdef CONFIG_IPV6_PRIVACY
 193         .use_tempaddr           = 0,
 194         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 195         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 196         .regen_max_retry        = REGEN_MAX_RETRY,
 197         .max_desync_factor      = MAX_DESYNC_FACTOR,
 198 #endif
 199         .max_addresses          = IPV6_MAX_ADDRESSES,
 200         .accept_ra_defrtr       = 1,
 201         .accept_ra_pinfo        = 1,
 202 #ifdef CONFIG_IPV6_ROUTER_PREF
 203         .accept_ra_rtr_pref     = 1,
 204         .rtr_probe_interval     = 60 * HZ,
 205 #ifdef CONFIG_IPV6_ROUTE_INFO
 206         .accept_ra_rt_info_max_plen = 0,
 207 #endif
 208 #endif
 209         .proxy_ndp              = 0,
 210         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 211 };
 212
 213 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 214 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 215 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 216
 217 /* Check if a valid qdisc is available */
 218 static inline int addrconf_qdisc_ok(struct net_device *dev)
 219 {
 220         return (dev->qdisc != &noop_qdisc);
 221 }
 222
 223 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 224 {
 225         if (del_timer(&ifp->timer))
 226                 __in6_ifa_put(ifp);
 227 }
 228
 229 enum addrconf_timer_t
 230 {
 231         AC_NONE,
 232         AC_DAD,
 233         AC_RS,
 234 };
 235
 236 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 237                                enum addrconf_timer_t what,
 238                                unsigned long when)
 239 {
 240         if (!del_timer(&ifp->timer))
 241                 in6_ifa_hold(ifp);
 242
 243         switch (what) {
 244         case AC_DAD:
 245                 ifp->timer.function = addrconf_dad_timer;
 246                 break;
 247         case AC_RS:
 248                 ifp->timer.function = addrconf_rs_timer;
 249                 break;
 250         default:;
 251         }
 252         ifp->timer.expires = jiffies + when;
 253         add_timer(&ifp->timer);
 254 }
 255
 256 static int snmp6_alloc_dev(struct inet6_dev *idev)
 257 {
 258         int err = -ENOMEM;
 259
 260         if (!idev || !idev->dev)
 261                 return -EINVAL;
 262
 263         if (snmp_mib_init((void **)idev->stats.ipv6,
 264                           sizeof(struct ipstats_mib),
 265                           __alignof__(struct ipstats_mib)) < 0)
 266                 goto err_ip;
 267         if (snmp_mib_init((void **)idev->stats.icmpv6,
 268                           sizeof(struct icmpv6_mib),
 269                           __alignof__(struct icmpv6_mib)) < 0)
 270                 goto err_icmp;
 271         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 272                           sizeof(struct icmpv6msg_mib),
 273                           __alignof__(struct icmpv6msg_mib)) < 0)
 274                 goto err_icmpmsg;
 275
 276         return 0;
 277
 278 err_icmpmsg:
 279         snmp_mib_free((void **)idev->stats.icmpv6);
 280 err_icmp:
 281         snmp_mib_free((void **)idev->stats.ipv6);
 282 err_ip:
 283         return err;
 284 }
 285
 286 static int snmp6_free_dev(struct inet6_dev *idev)
 287 {
 288         snmp_mib_free((void **)idev->stats.icmpv6msg);
 289         snmp_mib_free((void **)idev->stats.icmpv6);
 290         snmp_mib_free((void **)idev->stats.ipv6);
 291         return 0;
 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, &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         init_timer(&ndev->regen_timer);
 376         ndev->regen_timer.function = ipv6_regen_rndid;
 377         ndev->regen_timer.data = (unsigned long) ndev;
 378         if ((dev->flags&IFF_LOOPBACK) ||
 379             dev->type == ARPHRD_TUNNEL ||
 380 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 381             dev->type == ARPHRD_SIT ||
 382 #endif
 383             dev->type == ARPHRD_NONE) {
 384                 printk(KERN_INFO
 385                        "%s: Disabled Privacy Extensions\n",
 386                        dev->name);
 387                 ndev->cnf.use_tempaddr = -1;
 388         } else {
 389                 in6_dev_hold(ndev);
 390                 ipv6_regen_rndid((unsigned long) ndev);
 391         }
 392 #endif
 393
 394         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 395                 ndev->if_flags |= IF_READY;
 396
 397         ipv6_mc_init_dev(ndev);
 398         ndev->tstamp = jiffies;
 399 #ifdef CONFIG_SYSCTL
 400         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 401                               NET_IPV6_NEIGH, "ipv6",
 402                               &ndisc_ifinfo_sysctl_change,
 403                               NULL);
 404         addrconf_sysctl_register(ndev, &ndev->cnf);
 405 #endif
 406         /* protected by rtnl_lock */
 407         rcu_assign_pointer(dev->ip6_ptr, ndev);
 408
 409         /* Join all-node multicast group */
 410         ipv6_addr_all_nodes(&maddr);
 411         ipv6_dev_mc_inc(dev, &maddr);
 412
 413         return ndev;
 414 }
 415
 416 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 417 {
 418         struct inet6_dev *idev;
 419
 420         ASSERT_RTNL();
 421
 422         if ((idev = __in6_dev_get(dev)) == NULL) {
 423                 if ((idev = ipv6_add_dev(dev)) == NULL)
 424                         return NULL;
 425         }
 426
 427         if (dev->flags&IFF_UP)
 428                 ipv6_mc_up(idev);
 429         return idev;
 430 }
 431
 432 #ifdef CONFIG_SYSCTL
 433 static void dev_forward_change(struct inet6_dev *idev)
 434 {
 435         struct net_device *dev;
 436         struct inet6_ifaddr *ifa;
 437         struct in6_addr addr;
 438
 439         if (!idev)
 440                 return;
 441         dev = idev->dev;
 442         if (dev && (dev->flags & IFF_MULTICAST)) {
 443                 ipv6_addr_all_routers(&addr);
 444
 445                 if (idev->cnf.forwarding)
 446                         ipv6_dev_mc_inc(dev, &addr);
 447                 else
 448                         ipv6_dev_mc_dec(dev, &addr);
 449         }
 450         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 451                 if (ifa->flags&IFA_F_TENTATIVE)
 452                         continue;
 453                 if (idev->cnf.forwarding)
 454                         addrconf_join_anycast(ifa);
 455                 else
 456                         addrconf_leave_anycast(ifa);
 457         }
 458 }
 459
 460
 461 static void addrconf_forward_change(void)
 462 {
 463         struct net_device *dev;
 464         struct inet6_dev *idev;
 465
 466         read_lock(&dev_base_lock);
 467         for_each_netdev(&init_net, dev) {
 468                 rcu_read_lock();
 469                 idev = __in6_dev_get(dev);
 470                 if (idev) {
 471                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 472                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 473                         if (changed)
 474                                 dev_forward_change(idev);
 475                 }
 476                 rcu_read_unlock();
 477         }
 478         read_unlock(&dev_base_lock);
 479 }
 480 #endif
 481
 482 /* Nobody refers to this ifaddr, destroy it */
 483
 484 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 485 {
 486         BUG_TRAP(ifp->if_next==NULL);
 487         BUG_TRAP(ifp->lst_next==NULL);
 488 #ifdef NET_REFCNT_DEBUG
 489         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 490 #endif
 491
 492         in6_dev_put(ifp->idev);
 493
 494         if (del_timer(&ifp->timer))
 495                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 496
 497         if (!ifp->dead) {
 498                 printk("Freeing alive inet6 address %p\n", ifp);
 499                 return;
 500         }
 501         dst_release(&ifp->rt->u.dst);
 502
 503         kfree(ifp);
 504 }
 505
 506 static void
 507 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 508 {
 509         struct inet6_ifaddr *ifa, **ifap;
 510         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 511
 512         /*
 513          * Each device address list is sorted in order of scope -
 514          * global before linklocal.
 515          */
 516         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 517              ifap = &ifa->if_next) {
 518                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 519                         break;
 520         }
 521
 522         ifp->if_next = *ifap;
 523         *ifap = ifp;
 524 }
 525
 526 /* On success it returns ifp with increased reference count */
 527
 528 static struct inet6_ifaddr *
 529 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 530               int scope, u32 flags)
 531 {
 532         struct inet6_ifaddr *ifa = NULL;
 533         struct rt6_info *rt;
 534         int hash;
 535         int err = 0;
 536
 537         rcu_read_lock_bh();
 538         if (idev->dead) {
 539                 err = -ENODEV;                  /*XXX*/
 540                 goto out2;
 541         }
 542
 543         write_lock(&addrconf_hash_lock);
 544
 545         /* Ignore adding duplicate addresses on an interface */
 546         if (ipv6_chk_same_addr(addr, idev->dev)) {
 547                 ADBG(("ipv6_add_addr: already assigned\n"));
 548                 err = -EEXIST;
 549                 goto out;
 550         }
 551
 552         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 553
 554         if (ifa == NULL) {
 555                 ADBG(("ipv6_add_addr: malloc failed\n"));
 556                 err = -ENOBUFS;
 557                 goto out;
 558         }
 559
 560         rt = addrconf_dst_alloc(idev, addr, 0);
 561         if (IS_ERR(rt)) {
 562                 err = PTR_ERR(rt);
 563                 goto out;
 564         }
 565
 566         ipv6_addr_copy(&ifa->addr, addr);
 567
 568         spin_lock_init(&ifa->lock);
 569         init_timer(&ifa->timer);
 570         ifa->timer.data = (unsigned long) ifa;
 571         ifa->scope = scope;
 572         ifa->prefix_len = pfxlen;
 573         ifa->flags = flags | IFA_F_TENTATIVE;
 574         ifa->cstamp = ifa->tstamp = jiffies;
 575
 576         ifa->rt = rt;
 577
 578         /*
 579          * part one of RFC 4429, section 3.3
 580          * We should not configure an address as
 581          * optimistic if we do not yet know the link
 582          * layer address of our nexhop router
 583          */
 584
 585         if (rt->rt6i_nexthop == NULL)
 586                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 587
 588         ifa->idev = idev;
 589         in6_dev_hold(idev);
 590         /* For caller */
 591         in6_ifa_hold(ifa);
 592
 593         /* Add to big hash table */
 594         hash = ipv6_addr_hash(addr);
 595
 596         ifa->lst_next = inet6_addr_lst[hash];
 597         inet6_addr_lst[hash] = ifa;
 598         in6_ifa_hold(ifa);
 599         write_unlock(&addrconf_hash_lock);
 600
 601         write_lock(&idev->lock);
 602         /* Add to inet6_dev unicast addr list. */
 603         ipv6_link_dev_addr(idev, ifa);
 604
 605 #ifdef CONFIG_IPV6_PRIVACY
 606         if (ifa->flags&IFA_F_TEMPORARY) {
 607                 ifa->tmp_next = idev->tempaddr_list;
 608                 idev->tempaddr_list = ifa;
 609                 in6_ifa_hold(ifa);
 610         }
 611 #endif
 612
 613         in6_ifa_hold(ifa);
 614         write_unlock(&idev->lock);
 615 out2:
 616         rcu_read_unlock_bh();
 617
 618         if (likely(err == 0))
 619                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 620         else {
 621                 kfree(ifa);
 622                 ifa = ERR_PTR(err);
 623         }
 624
 625         return ifa;
 626 out:
 627         write_unlock(&addrconf_hash_lock);
 628         goto out2;
 629 }
 630
 631 /* This function wants to get referenced ifp and releases it before return */
 632
 633 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 634 {
 635         struct inet6_ifaddr *ifa, **ifap;
 636         struct inet6_dev *idev = ifp->idev;
 637         int hash;
 638         int deleted = 0, onlink = 0;
 639         unsigned long expires = jiffies;
 640
 641         hash = ipv6_addr_hash(&ifp->addr);
 642
 643         ifp->dead = 1;
 644
 645         write_lock_bh(&addrconf_hash_lock);
 646         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 647              ifap = &ifa->lst_next) {
 648                 if (ifa == ifp) {
 649                         *ifap = ifa->lst_next;
 650                         __in6_ifa_put(ifp);
 651                         ifa->lst_next = NULL;
 652                         break;
 653                 }
 654         }
 655         write_unlock_bh(&addrconf_hash_lock);
 656
 657         write_lock_bh(&idev->lock);
 658 #ifdef CONFIG_IPV6_PRIVACY
 659         if (ifp->flags&IFA_F_TEMPORARY) {
 660                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 661                      ifap = &ifa->tmp_next) {
 662                         if (ifa == ifp) {
 663                                 *ifap = ifa->tmp_next;
 664                                 if (ifp->ifpub) {
 665                                         in6_ifa_put(ifp->ifpub);
 666                                         ifp->ifpub = NULL;
 667                                 }
 668                                 __in6_ifa_put(ifp);
 669                                 ifa->tmp_next = NULL;
 670                                 break;
 671                         }
 672                 }
 673         }
 674 #endif
 675
 676         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 677                 if (ifa == ifp) {
 678                         *ifap = ifa->if_next;
 679                         __in6_ifa_put(ifp);
 680                         ifa->if_next = NULL;
 681                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 682                                 break;
 683                         deleted = 1;
 684                         continue;
 685                 } else if (ifp->flags & IFA_F_PERMANENT) {
 686                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 687                                               ifp->prefix_len)) {
 688                                 if (ifa->flags & IFA_F_PERMANENT) {
 689                                         onlink = 1;
 690                                         if (deleted)
 691                                                 break;
 692                                 } else {
 693                                         unsigned long lifetime;
 694
 695                                         if (!onlink)
 696                                                 onlink = -1;
 697
 698                                         spin_lock(&ifa->lock);
 699                                         lifetime = min_t(unsigned long,
 700                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 701                                         if (time_before(expires,
 702                                                         ifa->tstamp + lifetime * HZ))
 703                                                 expires = ifa->tstamp + lifetime * HZ;
 704                                         spin_unlock(&ifa->lock);
 705                                 }
 706                         }
 707                 }
 708                 ifap = &ifa->if_next;
 709         }
 710         write_unlock_bh(&idev->lock);
 711
 712         ipv6_ifa_notify(RTM_DELADDR, ifp);
 713
 714         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 715
 716         addrconf_del_timer(ifp);
 717
 718         /*
 719          * Purge or update corresponding prefix
 720          *
 721          * 1) we don't purge prefix here if address was not permanent.
 722          *    prefix is managed by its own lifetime.
 723          * 2) if there're no addresses, delete prefix.
 724          * 3) if there're still other permanent address(es),
 725          *    corresponding prefix is still permanent.
 726          * 4) otherwise, update prefix lifetime to the
 727          *    longest valid lifetime among the corresponding
 728          *    addresses on the device.
 729          *    Note: subsequent RA will update lifetime.
 730          *
 731          * --yoshfuji
 732          */
 733         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 734                 struct in6_addr prefix;
 735                 struct rt6_info *rt;
 736
 737                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 738                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 739
 740                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 741                         if (onlink == 0) {
 742                                 ip6_del_rt(rt);
 743                                 rt = NULL;
 744                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 745                                 rt->rt6i_expires = expires;
 746                                 rt->rt6i_flags |= RTF_EXPIRES;
 747                         }
 748                 }
 749                 dst_release(&rt->u.dst);
 750         }
 751
 752         in6_ifa_put(ifp);
 753 }
 754
 755 #ifdef CONFIG_IPV6_PRIVACY
 756 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 757 {
 758         struct inet6_dev *idev = ifp->idev;
 759         struct in6_addr addr, *tmpaddr;
 760         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 761         int tmp_plen;
 762         int ret = 0;
 763         int max_addresses;
 764         u32 addr_flags;
 765
 766         write_lock(&idev->lock);
 767         if (ift) {
 768                 spin_lock_bh(&ift->lock);
 769                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 770                 spin_unlock_bh(&ift->lock);
 771                 tmpaddr = &addr;
 772         } else {
 773                 tmpaddr = NULL;
 774         }
 775 retry:
 776         in6_dev_hold(idev);
 777         if (idev->cnf.use_tempaddr <= 0) {
 778                 write_unlock(&idev->lock);
 779                 printk(KERN_INFO
 780                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 781                 in6_dev_put(idev);
 782                 ret = -1;
 783                 goto out;
 784         }
 785         spin_lock_bh(&ifp->lock);
 786         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 787                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 788                 spin_unlock_bh(&ifp->lock);
 789                 write_unlock(&idev->lock);
 790                 printk(KERN_WARNING
 791                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 792                 in6_dev_put(idev);
 793                 ret = -1;
 794                 goto out;
 795         }
 796         in6_ifa_hold(ifp);
 797         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 798         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 799                 spin_unlock_bh(&ifp->lock);
 800                 write_unlock(&idev->lock);
 801                 printk(KERN_WARNING
 802                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 803                 in6_ifa_put(ifp);
 804                 in6_dev_put(idev);
 805                 ret = -1;
 806                 goto out;
 807         }
 808         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 809         tmp_valid_lft = min_t(__u32,
 810                               ifp->valid_lft,
 811                               idev->cnf.temp_valid_lft);
 812         tmp_prefered_lft = min_t(__u32,
 813                                  ifp->prefered_lft,
 814                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 815         tmp_plen = ifp->prefix_len;
 816         max_addresses = idev->cnf.max_addresses;
 817         tmp_cstamp = ifp->cstamp;
 818         tmp_tstamp = ifp->tstamp;
 819         spin_unlock_bh(&ifp->lock);
 820
 821         write_unlock(&idev->lock);
 822
 823         addr_flags = IFA_F_TEMPORARY;
 824         /* set in addrconf_prefix_rcv() */
 825         if (ifp->flags & IFA_F_OPTIMISTIC)
 826                 addr_flags |= IFA_F_OPTIMISTIC;
 827
 828         ift = !max_addresses ||
 829               ipv6_count_addresses(idev) < max_addresses ?
 830                 ipv6_add_addr(idev, &addr, tmp_plen,
 831                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 832                               addr_flags) : NULL;
 833         if (!ift || IS_ERR(ift)) {
 834                 in6_ifa_put(ifp);
 835                 in6_dev_put(idev);
 836                 printk(KERN_INFO
 837                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 838                 tmpaddr = &addr;
 839                 write_lock(&idev->lock);
 840                 goto retry;
 841         }
 842
 843         spin_lock_bh(&ift->lock);
 844         ift->ifpub = ifp;
 845         ift->valid_lft = tmp_valid_lft;
 846         ift->prefered_lft = tmp_prefered_lft;
 847         ift->cstamp = tmp_cstamp;
 848         ift->tstamp = tmp_tstamp;
 849         spin_unlock_bh(&ift->lock);
 850
 851         addrconf_dad_start(ift, 0);
 852         in6_ifa_put(ift);
 853         in6_dev_put(idev);
 854 out:
 855         return ret;
 856 }
 857 #endif
 858
 859 /*
 860  *      Choose an appropriate source address (RFC3484)
 861  */
 862 struct ipv6_saddr_score {
 863         int             addr_type;
 864         unsigned int    attrs;
 865         int             matchlen;
 866         int             scope;
 867         unsigned int    rule;
 868 };
 869
 870 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 871 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 872 #define IPV6_SADDR_SCORE_HOA            0x0008
 873 #define IPV6_SADDR_SCORE_OIF            0x0010
 874 #define IPV6_SADDR_SCORE_LABEL          0x0020
 875 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 876
 877 static inline int ipv6_saddr_preferred(int type)
 878 {
 879         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 880                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 881                 return 1;
 882         return 0;
 883 }
 884
 885 /* static matching label */
 886 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
 887 {
 888  /*
 889   *     prefix (longest match)  label
 890   *     -----------------------------
 891   *     ::1/128                 0
 892   *     ::/0                    1
 893   *     2002::/16               2
 894   *     ::/96                   3
 895   *     ::ffff:0:0/96           4
 896   *     fc00::/7                5
 897   *     2001::/32               6
 898   */
 899         if (type & IPV6_ADDR_LOOPBACK)
 900                 return 0;
 901         else if (type & IPV6_ADDR_COMPATv4)
 902                 return 3;
 903         else if (type & IPV6_ADDR_MAPPED)
 904                 return 4;
 905         else if (addr->s6_addr32[0] == htonl(0x20010000))
 906                 return 6;
 907         else if (addr->s6_addr16[0] == htons(0x2002))
 908                 return 2;
 909         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 910                 return 5;
 911         return 1;
 912 }
 913
 914 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 915                        struct in6_addr *daddr, struct in6_addr *saddr)
 916 {
 917         struct ipv6_saddr_score hiscore;
 918         struct inet6_ifaddr *ifa_result = NULL;
 919         int daddr_type = __ipv6_addr_type(daddr);
 920         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 921         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 922         struct net_device *dev;
 923
 924         memset(&hiscore, 0, sizeof(hiscore));
 925
 926         read_lock(&dev_base_lock);
 927         rcu_read_lock();
 928
 929         for_each_netdev(&init_net, dev) {
 930                 struct inet6_dev *idev;
 931                 struct inet6_ifaddr *ifa;
 932
 933                 /* Rule 0: Candidate Source Address (section 4)
 934                  *  - multicast and link-local destination address,
 935                  *    the set of candidate source address MUST only
 936                  *    include addresses assigned to interfaces
 937                  *    belonging to the same link as the outgoing
 938                  *    interface.
 939                  * (- For site-local destination addresses, the
 940                  *    set of candidate source addresses MUST only
 941                  *    include addresses assigned to interfaces
 942                  *    belonging to the same site as the outgoing
 943                  *    interface.)
 944                  */
 945                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 946                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 947                     daddr_dev && dev != daddr_dev)
 948                         continue;
 949
 950                 idev = __in6_dev_get(dev);
 951                 if (!idev)
 952                         continue;
 953
 954                 read_lock_bh(&idev->lock);
 955                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 956                         struct ipv6_saddr_score score;
 957
 958                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 959
 960                         /* Rule 0:
 961                          * - Tentative Address (RFC2462 section 5.4)
 962                          *  - A tentative address is not considered
 963                          *    "assigned to an interface" in the traditional
 964                          *    sense, unless it is also flagged as optimistic.
 965                          * - Candidate Source Address (section 4)
 966                          *  - In any case, anycast addresses, multicast
 967                          *    addresses, and the unspecified address MUST
 968                          *    NOT be included in a candidate set.
 969                          */
 970                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 971                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 972                                 continue;
 973                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 974                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 975                                 LIMIT_NETDEBUG(KERN_DEBUG
 976                                                "ADDRCONF: unspecified / multicast address"
 977                                                "assigned as unicast address on %s",
 978                                                dev->name);
 979                                 continue;
 980                         }
 981
 982                         score.attrs = 0;
 983                         score.matchlen = 0;
 984                         score.scope = 0;
 985                         score.rule = 0;
 986
 987                         if (ifa_result == NULL) {
 988                                 /* record it if the first available entry */
 989                                 goto record_it;
 990                         }
 991
 992                         /* Rule 1: Prefer same address */
 993                         if (hiscore.rule < 1) {
 994                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 995                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 996                                 hiscore.rule++;
 997                         }
 998                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 999                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
1000                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1001                                         score.rule = 1;
1002                                         goto record_it;
1003                                 }
1004                         } else {
1005                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1006                                         continue;
1007                         }
1008
1009                         /* Rule 2: Prefer appropriate scope */
1010                         if (hiscore.rule < 2) {
1011                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1012                                 hiscore.rule++;
1013                         }
1014                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1015                         if (hiscore.scope < score.scope) {
1016                                 if (hiscore.scope < daddr_scope) {
1017                                         score.rule = 2;
1018                                         goto record_it;
1019                                 } else
1020                                         continue;
1021                         } else if (score.scope < hiscore.scope) {
1022                                 if (score.scope < daddr_scope)
1023                                         break; /* addresses sorted by scope */
1024                                 else {
1025                                         score.rule = 2;
1026                                         goto record_it;
1027                                 }
1028                         }
1029
1030                         /* Rule 3: Avoid deprecated and optimistic addresses */
1031                         if (hiscore.rule < 3) {
1032                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1033                                    (((ifa_result->flags &
1034                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1035                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1036                                 hiscore.rule++;
1037                         }
1038                         if (ipv6_saddr_preferred(score.addr_type) ||
1039                            (((ifa->flags &
1040                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1041                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1042                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1043                                         score.rule = 3;
1044                                         goto record_it;
1045                                 }
1046                         } else {
1047                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1048                                         continue;
1049                         }
1050
1051                         /* Rule 4: Prefer home address */
1052 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1053                         if (hiscore.rule < 4) {
1054                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1055                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1056                                 hiscore.rule++;
1057                         }
1058                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1059                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1060                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1061                                         score.rule = 4;
1062                                         goto record_it;
1063                                 }
1064                         } else {
1065                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1066                                         continue;
1067                         }
1068 #else
1069                         if (hiscore.rule < 4)
1070                                 hiscore.rule++;
1071 #endif
1072
1073                         /* Rule 5: Prefer outgoing interface */
1074                         if (hiscore.rule < 5) {
1075                                 if (daddr_dev == NULL ||
1076                                     daddr_dev == ifa_result->idev->dev)
1077                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1078                                 hiscore.rule++;
1079                         }
1080                         if (daddr_dev == NULL ||
1081                             daddr_dev == ifa->idev->dev) {
1082                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1083                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1084                                         score.rule = 5;
1085                                         goto record_it;
1086                                 }
1087                         } else {
1088                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1089                                         continue;
1090                         }
1091
1092                         /* Rule 6: Prefer matching label */
1093                         if (hiscore.rule < 6) {
1094                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1095                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1096                                 hiscore.rule++;
1097                         }
1098                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1099                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1100                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1101                                         score.rule = 6;
1102                                         goto record_it;
1103                                 }
1104                         } else {
1105                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1106                                         continue;
1107                         }
1108
1109 #ifdef CONFIG_IPV6_PRIVACY
1110                         /* Rule 7: Prefer public address
1111                          * Note: prefer temprary address if use_tempaddr >= 2
1112                          */
1113                         if (hiscore.rule < 7) {
1114                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1115                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1116                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1117                                 hiscore.rule++;
1118                         }
1119                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1120                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1121                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1122                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1123                                         score.rule = 7;
1124                                         goto record_it;
1125                                 }
1126                         } else {
1127                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1128                                         continue;
1129                         }
1130 #else
1131                         if (hiscore.rule < 7)
1132                                 hiscore.rule++;
1133 #endif
1134                         /* Rule 8: Use longest matching prefix */
1135                         if (hiscore.rule < 8) {
1136                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1137                                 hiscore.rule++;
1138                         }
1139                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1140                         if (score.matchlen > hiscore.matchlen) {
1141                                 score.rule = 8;
1142                                 goto record_it;
1143                         }
1144 #if 0
1145                         else if (score.matchlen < hiscore.matchlen)
1146                                 continue;
1147 #endif
1148
1149                         /* Final Rule: choose first available one */
1150                         continue;
1151 record_it:
1152                         if (ifa_result)
1153                                 in6_ifa_put(ifa_result);
1154                         in6_ifa_hold(ifa);
1155                         ifa_result = ifa;
1156                         hiscore = score;
1157                 }
1158                 read_unlock_bh(&idev->lock);
1159         }
1160         rcu_read_unlock();
1161         read_unlock(&dev_base_lock);
1162
1163         if (!ifa_result)
1164                 return -EADDRNOTAVAIL;
1165
1166         ipv6_addr_copy(saddr, &ifa_result->addr);
1167         in6_ifa_put(ifa_result);
1168         return 0;
1169 }
1170
1171
1172 int ipv6_get_saddr(struct dst_entry *dst,
1173                    struct in6_addr *daddr, struct in6_addr *saddr)
1174 {
1175         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1176 }
1177
1178 EXPORT_SYMBOL(ipv6_get_saddr);
1179
1180 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1181                     unsigned char banned_flags)
1182 {
1183         struct inet6_dev *idev;
1184         int err = -EADDRNOTAVAIL;
1185
1186         rcu_read_lock();
1187         if ((idev = __in6_dev_get(dev)) != NULL) {
1188                 struct inet6_ifaddr *ifp;
1189
1190                 read_lock_bh(&idev->lock);
1191                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1192                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1193                                 ipv6_addr_copy(addr, &ifp->addr);
1194                                 err = 0;
1195                                 break;
1196                         }
1197                 }
1198                 read_unlock_bh(&idev->lock);
1199         }
1200         rcu_read_unlock();
1201         return err;
1202 }
1203
1204 static int ipv6_count_addresses(struct inet6_dev *idev)
1205 {
1206         int cnt = 0;
1207         struct inet6_ifaddr *ifp;
1208
1209         read_lock_bh(&idev->lock);
1210         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1211                 cnt++;
1212         read_unlock_bh(&idev->lock);
1213         return cnt;
1214 }
1215
1216 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1217 {
1218         struct inet6_ifaddr * ifp;
1219         u8 hash = ipv6_addr_hash(addr);
1220
1221         read_lock_bh(&addrconf_hash_lock);
1222         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1223                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1224                     !(ifp->flags&IFA_F_TENTATIVE)) {
1225                         if (dev == NULL || ifp->idev->dev == dev ||
1226                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1227                                 break;
1228                 }
1229         }
1230         read_unlock_bh(&addrconf_hash_lock);
1231         return ifp != NULL;
1232 }
1233
1234 EXPORT_SYMBOL(ipv6_chk_addr);
1235
1236 static
1237 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1238 {
1239         struct inet6_ifaddr * ifp;
1240         u8 hash = ipv6_addr_hash(addr);
1241
1242         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1243                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1244                         if (dev == NULL || ifp->idev->dev == dev)
1245                                 break;
1246                 }
1247         }
1248         return ifp != NULL;
1249 }
1250
1251 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, 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 (ipv6_addr_equal(&ifp->addr, addr)) {
1259                         if (dev == NULL || ifp->idev->dev == dev ||
1260                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1261                                 in6_ifa_hold(ifp);
1262                                 break;
1263                         }
1264                 }
1265         }
1266         read_unlock_bh(&addrconf_hash_lock);
1267
1268         return ifp;
1269 }
1270
1271 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1272 {
1273         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1274         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1275         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1276         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1277         int sk_ipv6only = ipv6_only_sock(sk);
1278         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1279         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1280         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1281
1282         if (!sk2_rcv_saddr && !sk_ipv6only)
1283                 return 1;
1284
1285         if (addr_type2 == IPV6_ADDR_ANY &&
1286             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1287                 return 1;
1288
1289         if (addr_type == IPV6_ADDR_ANY &&
1290             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1291                 return 1;
1292
1293         if (sk2_rcv_saddr6 &&
1294             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1295                 return 1;
1296
1297         if (addr_type == IPV6_ADDR_MAPPED &&
1298             !sk2_ipv6only &&
1299             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1300                 return 1;
1301
1302         return 0;
1303 }
1304
1305 /* Gets referenced address, destroys ifaddr */
1306
1307 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1308 {
1309         if (ifp->flags&IFA_F_PERMANENT) {
1310                 spin_lock_bh(&ifp->lock);
1311                 addrconf_del_timer(ifp);
1312                 ifp->flags |= IFA_F_TENTATIVE;
1313                 spin_unlock_bh(&ifp->lock);
1314                 in6_ifa_put(ifp);
1315 #ifdef CONFIG_IPV6_PRIVACY
1316         } else if (ifp->flags&IFA_F_TEMPORARY) {
1317                 struct inet6_ifaddr *ifpub;
1318                 spin_lock_bh(&ifp->lock);
1319                 ifpub = ifp->ifpub;
1320                 if (ifpub) {
1321                         in6_ifa_hold(ifpub);
1322                         spin_unlock_bh(&ifp->lock);
1323                         ipv6_create_tempaddr(ifpub, ifp);
1324                         in6_ifa_put(ifpub);
1325                 } else {
1326                         spin_unlock_bh(&ifp->lock);
1327                 }
1328                 ipv6_del_addr(ifp);
1329 #endif
1330         } else
1331                 ipv6_del_addr(ifp);
1332 }
1333
1334 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1335 {
1336         if (net_ratelimit())
1337                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1338         addrconf_dad_stop(ifp);
1339 }
1340
1341 /* Join to solicited addr multicast group. */
1342
1343 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1344 {
1345         struct in6_addr maddr;
1346
1347         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1348                 return;
1349
1350         addrconf_addr_solict_mult(addr, &maddr);
1351         ipv6_dev_mc_inc(dev, &maddr);
1352 }
1353
1354 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1355 {
1356         struct in6_addr maddr;
1357
1358         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1359                 return;
1360
1361         addrconf_addr_solict_mult(addr, &maddr);
1362         __ipv6_dev_mc_dec(idev, &maddr);
1363 }
1364
1365 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1366 {
1367         struct in6_addr addr;
1368         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1369         if (ipv6_addr_any(&addr))
1370                 return;
1371         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1372 }
1373
1374 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1375 {
1376         struct in6_addr addr;
1377         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1378         if (ipv6_addr_any(&addr))
1379                 return;
1380         __ipv6_dev_ac_dec(ifp->idev, &addr);
1381 }
1382
1383 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1384 {
1385         if (dev->addr_len != ETH_ALEN)
1386                 return -1;
1387         memcpy(eui, dev->dev_addr, 3);
1388         memcpy(eui + 5, dev->dev_addr + 3, 3);
1389
1390         /*
1391          * The zSeries OSA network cards can be shared among various
1392          * OS instances, but the OSA cards have only one MAC address.
1393          * This leads to duplicate address conflicts in conjunction
1394          * with IPv6 if more than one instance uses the same card.
1395          *
1396          * The driver for these cards can deliver a unique 16-bit
1397          * identifier for each instance sharing the same card.  It is
1398          * placed instead of 0xFFFE in the interface identifier.  The
1399          * "u" bit of the interface identifier is not inverted in this
1400          * case.  Hence the resulting interface identifier has local
1401          * scope according to RFC2373.
1402          */
1403         if (dev->dev_id) {
1404                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1405                 eui[4] = dev->dev_id & 0xFF;
1406         } else {
1407                 eui[3] = 0xFF;
1408                 eui[4] = 0xFE;
1409                 eui[0] ^= 2;
1410         }
1411         return 0;
1412 }
1413
1414 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1415 {
1416         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1417         if (dev->addr_len != ARCNET_ALEN)
1418                 return -1;
1419         memset(eui, 0, 7);
1420         eui[7] = *(u8*)dev->dev_addr;
1421         return 0;
1422 }
1423
1424 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1425 {
1426         if (dev->addr_len != INFINIBAND_ALEN)
1427                 return -1;
1428         memcpy(eui, dev->dev_addr + 12, 8);
1429         eui[0] |= 2;
1430         return 0;
1431 }
1432
1433 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1434 {
1435         switch (dev->type) {
1436         case ARPHRD_ETHER:
1437         case ARPHRD_FDDI:
1438         case ARPHRD_IEEE802_TR:
1439                 return addrconf_ifid_eui48(eui, dev);
1440         case ARPHRD_ARCNET:
1441                 return addrconf_ifid_arcnet(eui, dev);
1442         case ARPHRD_INFINIBAND:
1443                 return addrconf_ifid_infiniband(eui, dev);
1444         }
1445         return -1;
1446 }
1447
1448 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1449 {
1450         int err = -1;
1451         struct inet6_ifaddr *ifp;
1452
1453         read_lock_bh(&idev->lock);
1454         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1455                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1456                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1457                         err = 0;
1458                         break;
1459                 }
1460         }
1461         read_unlock_bh(&idev->lock);
1462         return err;
1463 }
1464
1465 #ifdef CONFIG_IPV6_PRIVACY
1466 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1467 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1468 {
1469 regen:
1470         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1471         idev->rndid[0] &= ~0x02;
1472
1473         /*
1474          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1475          * check if generated address is not inappropriate
1476          *
1477          *  - Reserved subnet anycast (RFC 2526)
1478          *      11111101 11....11 1xxxxxxx
1479          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1480          *      00-00-5E-FE-xx-xx-xx-xx
1481          *  - value 0
1482          *  - XXX: already assigned to an address on the device
1483          */
1484         if (idev->rndid[0] == 0xfd &&
1485             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1486             (idev->rndid[7]&0x80))
1487                 goto regen;
1488         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1489                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1490                         goto regen;
1491                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1492                         goto regen;
1493         }
1494
1495         return 0;
1496 }
1497
1498 static void ipv6_regen_rndid(unsigned long data)
1499 {
1500         struct inet6_dev *idev = (struct inet6_dev *) data;
1501         unsigned long expires;
1502
1503         rcu_read_lock_bh();
1504         write_lock_bh(&idev->lock);
1505
1506         if (idev->dead)
1507                 goto out;
1508
1509         if (__ipv6_regen_rndid(idev) < 0)
1510                 goto out;
1511
1512         expires = jiffies +
1513                 idev->cnf.temp_prefered_lft * HZ -
1514                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1515         if (time_before(expires, jiffies)) {
1516                 printk(KERN_WARNING
1517                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1518                         idev->dev->name);
1519                 goto out;
1520         }
1521
1522         if (!mod_timer(&idev->regen_timer, expires))
1523                 in6_dev_hold(idev);
1524
1525 out:
1526         write_unlock_bh(&idev->lock);
1527         rcu_read_unlock_bh();
1528         in6_dev_put(idev);
1529 }
1530
1531 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1532         int ret = 0;
1533
1534         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1535                 ret = __ipv6_regen_rndid(idev);
1536         return ret;
1537 }
1538 #endif
1539
1540 /*
1541  *      Add prefix route.
1542  */
1543
1544 static void
1545 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1546                       unsigned long expires, u32 flags)
1547 {
1548         struct fib6_config cfg = {
1549                 .fc_table = RT6_TABLE_PREFIX,
1550                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1551                 .fc_ifindex = dev->ifindex,
1552                 .fc_expires = expires,
1553                 .fc_dst_len = plen,
1554                 .fc_flags = RTF_UP | flags,
1555         };
1556
1557         ipv6_addr_copy(&cfg.fc_dst, pfx);
1558
1559         /* Prevent useless cloning on PtP SIT.
1560            This thing is done here expecting that the whole
1561            class of non-broadcast devices need not cloning.
1562          */
1563 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1564         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1565                 cfg.fc_flags |= RTF_NONEXTHOP;
1566 #endif
1567
1568         ip6_route_add(&cfg);
1569 }
1570
1571 /* Create "default" multicast route to the interface */
1572
1573 static void addrconf_add_mroute(struct net_device *dev)
1574 {
1575         struct fib6_config cfg = {
1576                 .fc_table = RT6_TABLE_LOCAL,
1577                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1578                 .fc_ifindex = dev->ifindex,
1579                 .fc_dst_len = 8,
1580                 .fc_flags = RTF_UP,
1581         };
1582
1583         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1584
1585         ip6_route_add(&cfg);
1586 }
1587
1588 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1589 static void sit_route_add(struct net_device *dev)
1590 {
1591         struct fib6_config cfg = {
1592                 .fc_table = RT6_TABLE_MAIN,
1593                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1594                 .fc_ifindex = dev->ifindex,
1595                 .fc_dst_len = 96,
1596                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1597         };
1598
1599         /* prefix length - 96 bits "::d.d.d.d" */
1600         ip6_route_add(&cfg);
1601 }
1602 #endif
1603
1604 static void addrconf_add_lroute(struct net_device *dev)
1605 {
1606         struct in6_addr addr;
1607
1608         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1609         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1610 }
1611
1612 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1613 {
1614         struct inet6_dev *idev;
1615
1616         ASSERT_RTNL();
1617
1618         if ((idev = ipv6_find_idev(dev)) == NULL)
1619                 return NULL;
1620
1621         /* Add default multicast route */
1622         addrconf_add_mroute(dev);
1623
1624         /* Add link local route */
1625         addrconf_add_lroute(dev);
1626         return idev;
1627 }
1628
1629 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1630 {
1631         struct prefix_info *pinfo;
1632         __u32 valid_lft;
1633         __u32 prefered_lft;
1634         int addr_type;
1635         unsigned long rt_expires;
1636         struct inet6_dev *in6_dev;
1637
1638         pinfo = (struct prefix_info *) opt;
1639
1640         if (len < sizeof(struct prefix_info)) {
1641                 ADBG(("addrconf: prefix option too short\n"));
1642                 return;
1643         }
1644
1645         /*
1646          *      Validation checks ([ADDRCONF], page 19)
1647          */
1648
1649         addr_type = ipv6_addr_type(&pinfo->prefix);
1650
1651         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1652                 return;
1653
1654         valid_lft = ntohl(pinfo->valid);
1655         prefered_lft = ntohl(pinfo->prefered);
1656
1657         if (prefered_lft > valid_lft) {
1658                 if (net_ratelimit())
1659                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1660                 return;
1661         }
1662
1663         in6_dev = in6_dev_get(dev);
1664
1665         if (in6_dev == NULL) {
1666                 if (net_ratelimit())
1667                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1668                 return;
1669         }
1670
1671         /*
1672          *      Two things going on here:
1673          *      1) Add routes for on-link prefixes
1674          *      2) Configure prefixes with the auto flag set
1675          */
1676
1677         /* Avoid arithmetic overflow. Really, we could
1678            save rt_expires in seconds, likely valid_lft,
1679            but it would require division in fib gc, that it
1680            not good.
1681          */
1682         if (valid_lft >= 0x7FFFFFFF/HZ)
1683                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1684         else
1685                 rt_expires = valid_lft * HZ;
1686
1687         /*
1688          * We convert this (in jiffies) to clock_t later.
1689          * Avoid arithmetic overflow there as well.
1690          * Overflow can happen only if HZ < USER_HZ.
1691          */
1692         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1693                 rt_expires = 0x7FFFFFFF / USER_HZ;
1694
1695         if (pinfo->onlink) {
1696                 struct rt6_info *rt;
1697                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1698
1699                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1700                         if (rt->rt6i_flags&RTF_EXPIRES) {
1701                                 if (valid_lft == 0) {
1702                                         ip6_del_rt(rt);
1703                                         rt = NULL;
1704                                 } else {
1705                                         rt->rt6i_expires = jiffies + rt_expires;
1706                                 }
1707                         }
1708                 } else if (valid_lft) {
1709                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1710                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1711                 }
1712                 if (rt)
1713                         dst_release(&rt->u.dst);
1714         }
1715
1716         /* Try to figure out our local address for this prefix */
1717
1718         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1719                 struct inet6_ifaddr * ifp;
1720                 struct in6_addr addr;
1721                 int create = 0, update_lft = 0;
1722
1723                 if (pinfo->prefix_len == 64) {
1724                         memcpy(&addr, &pinfo->prefix, 8);
1725                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1726                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1727                                 in6_dev_put(in6_dev);
1728                                 return;
1729                         }
1730                         goto ok;
1731                 }
1732                 if (net_ratelimit())
1733                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1734                                pinfo->prefix_len);
1735                 in6_dev_put(in6_dev);
1736                 return;
1737
1738 ok:
1739
1740                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1741
1742                 if (ifp == NULL && valid_lft) {
1743                         int max_addresses = in6_dev->cnf.max_addresses;
1744                         u32 addr_flags = 0;
1745
1746 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1747                         if (in6_dev->cnf.optimistic_dad &&
1748                             !ipv6_devconf.forwarding)
1749                                 addr_flags = IFA_F_OPTIMISTIC;
1750 #endif
1751
1752                         /* Do not allow to create too much of autoconfigured
1753                          * addresses; this would be too easy way to crash kernel.
1754                          */
1755                         if (!max_addresses ||
1756                             ipv6_count_addresses(in6_dev) < max_addresses)
1757                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1758                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1759                                                     addr_flags);
1760
1761                         if (!ifp || IS_ERR(ifp)) {
1762                                 in6_dev_put(in6_dev);
1763                                 return;
1764                         }
1765
1766                         update_lft = create = 1;
1767                         ifp->cstamp = jiffies;
1768                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1769                 }
1770
1771                 if (ifp) {
1772                         int flags;
1773                         unsigned long now;
1774 #ifdef CONFIG_IPV6_PRIVACY
1775                         struct inet6_ifaddr *ift;
1776 #endif
1777                         u32 stored_lft;
1778
1779                         /* update lifetime (RFC2462 5.5.3 e) */
1780                         spin_lock(&ifp->lock);
1781                         now = jiffies;
1782                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1783                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1784                         else
1785                                 stored_lft = 0;
1786                         if (!update_lft && stored_lft) {
1787                                 if (valid_lft > MIN_VALID_LIFETIME ||
1788                                     valid_lft > stored_lft)
1789                                         update_lft = 1;
1790                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1791                                         /* valid_lft <= stored_lft is always true */
1792                                         /* XXX: IPsec */
1793                                         update_lft = 0;
1794                                 } else {
1795                                         valid_lft = MIN_VALID_LIFETIME;
1796                                         if (valid_lft < prefered_lft)
1797                                                 prefered_lft = valid_lft;
1798                                         update_lft = 1;
1799                                 }
1800                         }
1801
1802                         if (update_lft) {
1803                                 ifp->valid_lft = valid_lft;
1804                                 ifp->prefered_lft = prefered_lft;
1805                                 ifp->tstamp = now;
1806                                 flags = ifp->flags;
1807                                 ifp->flags &= ~IFA_F_DEPRECATED;
1808                                 spin_unlock(&ifp->lock);
1809
1810                                 if (!(flags&IFA_F_TENTATIVE))
1811                                         ipv6_ifa_notify(0, ifp);
1812                         } else
1813                                 spin_unlock(&ifp->lock);
1814
1815 #ifdef CONFIG_IPV6_PRIVACY
1816                         read_lock_bh(&in6_dev->lock);
1817                         /* update all temporary addresses in the list */
1818                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1819                                 /*
1820                                  * When adjusting the lifetimes of an existing
1821                                  * temporary address, only lower the lifetimes.
1822                                  * Implementations must not increase the
1823                                  * lifetimes of an existing temporary address
1824                                  * when processing a Prefix Information Option.
1825                                  */
1826                                 spin_lock(&ift->lock);
1827                                 flags = ift->flags;
1828                                 if (ift->valid_lft > valid_lft &&
1829                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1830                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1831                                 if (ift->prefered_lft > prefered_lft &&
1832                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1833                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1834                                 spin_unlock(&ift->lock);
1835                                 if (!(flags&IFA_F_TENTATIVE))
1836                                         ipv6_ifa_notify(0, ift);
1837                         }
1838
1839                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1840                                 /*
1841                                  * When a new public address is created as described in [ADDRCONF],
1842                                  * also create a new temporary address.
1843                                  */
1844                                 read_unlock_bh(&in6_dev->lock);
1845                                 ipv6_create_tempaddr(ifp, NULL);
1846                         } else {
1847                                 read_unlock_bh(&in6_dev->lock);
1848                         }
1849 #endif
1850                         in6_ifa_put(ifp);
1851                         addrconf_verify(0);
1852                 }
1853         }
1854         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1855         in6_dev_put(in6_dev);
1856 }
1857
1858 /*
1859  *      Set destination address.
1860  *      Special case for SIT interfaces where we create a new "virtual"
1861  *      device.
1862  */
1863 int addrconf_set_dstaddr(void __user *arg)
1864 {
1865         struct in6_ifreq ireq;
1866         struct net_device *dev;
1867         int err = -EINVAL;
1868
1869         rtnl_lock();
1870
1871         err = -EFAULT;
1872         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1873                 goto err_exit;
1874
1875         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1876
1877         err = -ENODEV;
1878         if (dev == NULL)
1879                 goto err_exit;
1880
1881 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1882         if (dev->type == ARPHRD_SIT) {
1883                 struct ifreq ifr;
1884                 mm_segment_t    oldfs;
1885                 struct ip_tunnel_parm p;
1886
1887                 err = -EADDRNOTAVAIL;
1888                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1889                         goto err_exit;
1890
1891                 memset(&p, 0, sizeof(p));
1892                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1893                 p.iph.saddr = 0;
1894                 p.iph.version = 4;
1895                 p.iph.ihl = 5;
1896                 p.iph.protocol = IPPROTO_IPV6;
1897                 p.iph.ttl = 64;
1898                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1899
1900                 oldfs = get_fs(); set_fs(KERNEL_DS);
1901                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1902                 set_fs(oldfs);
1903
1904                 if (err == 0) {
1905                         err = -ENOBUFS;
1906                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1907                                 goto err_exit;
1908                         err = dev_open(dev);
1909                 }
1910         }
1911 #endif
1912
1913 err_exit:
1914         rtnl_unlock();
1915         return err;
1916 }
1917
1918 /*
1919  *      Manual configuration of address on an interface
1920  */
1921 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1922                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1923 {
1924         struct inet6_ifaddr *ifp;
1925         struct inet6_dev *idev;
1926         struct net_device *dev;
1927         int scope;
1928         u32 flags = RTF_EXPIRES;
1929
1930         ASSERT_RTNL();
1931
1932         /* check the lifetime */
1933         if (!valid_lft || prefered_lft > valid_lft)
1934                 return -EINVAL;
1935
1936         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1937                 return -ENODEV;
1938
1939         if ((idev = addrconf_add_dev(dev)) == NULL)
1940                 return -ENOBUFS;
1941
1942         scope = ipv6_addr_scope(pfx);
1943
1944         if (valid_lft == INFINITY_LIFE_TIME) {
1945                 ifa_flags |= IFA_F_PERMANENT;
1946                 flags = 0;
1947         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1948                 valid_lft = 0x7FFFFFFF/HZ;
1949
1950         if (prefered_lft == 0)
1951                 ifa_flags |= IFA_F_DEPRECATED;
1952         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1953                  (prefered_lft != INFINITY_LIFE_TIME))
1954                 prefered_lft = 0x7FFFFFFF/HZ;
1955
1956         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1957
1958         if (!IS_ERR(ifp)) {
1959                 spin_lock_bh(&ifp->lock);
1960                 ifp->valid_lft = valid_lft;
1961                 ifp->prefered_lft = prefered_lft;
1962                 ifp->tstamp = jiffies;
1963                 spin_unlock_bh(&ifp->lock);
1964
1965                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1966                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1967                 /*
1968                  * Note that section 3.1 of RFC 4429 indicates
1969                  * that the Optimistic flag should not be set for
1970                  * manually configured addresses
1971                  */
1972                 addrconf_dad_start(ifp, 0);
1973                 in6_ifa_put(ifp);
1974                 addrconf_verify(0);
1975                 return 0;
1976         }
1977
1978         return PTR_ERR(ifp);
1979 }
1980
1981 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1982 {
1983         struct inet6_ifaddr *ifp;
1984         struct inet6_dev *idev;
1985         struct net_device *dev;
1986
1987         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1988                 return -ENODEV;
1989
1990         if ((idev = __in6_dev_get(dev)) == NULL)
1991                 return -ENXIO;
1992
1993         read_lock_bh(&idev->lock);
1994         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1995                 if (ifp->prefix_len == plen &&
1996                     ipv6_addr_equal(pfx, &ifp->addr)) {
1997                         in6_ifa_hold(ifp);
1998                         read_unlock_bh(&idev->lock);
1999
2000                         ipv6_del_addr(ifp);
2001
2002                         /* If the last address is deleted administratively,
2003                            disable IPv6 on this interface.
2004                          */
2005                         if (idev->addr_list == NULL)
2006                                 addrconf_ifdown(idev->dev, 1);
2007                         return 0;
2008                 }
2009         }
2010         read_unlock_bh(&idev->lock);
2011         return -EADDRNOTAVAIL;
2012 }
2013
2014
2015 int addrconf_add_ifaddr(void __user *arg)
2016 {
2017         struct in6_ifreq ireq;
2018         int err;
2019
2020         if (!capable(CAP_NET_ADMIN))
2021                 return -EPERM;
2022
2023         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2024                 return -EFAULT;
2025
2026         rtnl_lock();
2027         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2028                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2029         rtnl_unlock();
2030         return err;
2031 }
2032
2033 int addrconf_del_ifaddr(void __user *arg)
2034 {
2035         struct in6_ifreq ireq;
2036         int err;
2037
2038         if (!capable(CAP_NET_ADMIN))
2039                 return -EPERM;
2040
2041         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2042                 return -EFAULT;
2043
2044         rtnl_lock();
2045         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2046         rtnl_unlock();
2047         return err;
2048 }
2049
2050 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2051 static void sit_add_v4_addrs(struct inet6_dev *idev)
2052 {
2053         struct inet6_ifaddr * ifp;
2054         struct in6_addr addr;
2055         struct net_device *dev;
2056         int scope;
2057
2058         ASSERT_RTNL();
2059
2060         memset(&addr, 0, sizeof(struct in6_addr));
2061         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2062
2063         if (idev->dev->flags&IFF_POINTOPOINT) {
2064                 addr.s6_addr32[0] = htonl(0xfe800000);
2065                 scope = IFA_LINK;
2066         } else {
2067                 scope = IPV6_ADDR_COMPATv4;
2068         }
2069
2070         if (addr.s6_addr32[3]) {
2071                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2072                 if (!IS_ERR(ifp)) {
2073                         spin_lock_bh(&ifp->lock);
2074                         ifp->flags &= ~IFA_F_TENTATIVE;
2075                         spin_unlock_bh(&ifp->lock);
2076                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2077                         in6_ifa_put(ifp);
2078                 }
2079                 return;
2080         }
2081
2082         for_each_netdev(&init_net, dev) {
2083                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2084                 if (in_dev && (dev->flags & IFF_UP)) {
2085                         struct in_ifaddr * ifa;
2086
2087                         int flag = scope;
2088
2089                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2090                                 int plen;
2091
2092                                 addr.s6_addr32[3] = ifa->ifa_local;
2093
2094                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2095                                         continue;
2096                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2097                                         if (idev->dev->flags&IFF_POINTOPOINT)
2098                                                 continue;
2099                                         flag |= IFA_HOST;
2100                                 }
2101                                 if (idev->dev->flags&IFF_POINTOPOINT)
2102                                         plen = 64;
2103                                 else
2104                                         plen = 96;
2105
2106                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2107                                                     IFA_F_PERMANENT);
2108                                 if (!IS_ERR(ifp)) {
2109                                         spin_lock_bh(&ifp->lock);
2110                                         ifp->flags &= ~IFA_F_TENTATIVE;
2111                                         spin_unlock_bh(&ifp->lock);
2112                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2113                                         in6_ifa_put(ifp);
2114                                 }
2115                         }
2116                 }
2117         }
2118 }
2119 #endif
2120
2121 static void init_loopback(struct net_device *dev)
2122 {
2123         struct inet6_dev  *idev;
2124         struct inet6_ifaddr * ifp;
2125
2126         /* ::1 */
2127
2128         ASSERT_RTNL();
2129
2130         if ((idev = ipv6_find_idev(dev)) == NULL) {
2131                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2132                 return;
2133         }
2134
2135         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2136         if (!IS_ERR(ifp)) {
2137                 spin_lock_bh(&ifp->lock);
2138                 ifp->flags &= ~IFA_F_TENTATIVE;
2139                 spin_unlock_bh(&ifp->lock);
2140                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2141                 in6_ifa_put(ifp);
2142         }
2143 }
2144
2145 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2146 {
2147         struct inet6_ifaddr * ifp;
2148         u32 addr_flags = IFA_F_PERMANENT;
2149
2150 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2151         if (idev->cnf.optimistic_dad &&
2152             !ipv6_devconf.forwarding)
2153                 addr_flags |= IFA_F_OPTIMISTIC;
2154 #endif
2155
2156
2157         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2158         if (!IS_ERR(ifp)) {
2159                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2160                 addrconf_dad_start(ifp, 0);
2161                 in6_ifa_put(ifp);
2162         }
2163 }
2164
2165 static void addrconf_dev_config(struct net_device *dev)
2166 {
2167         struct in6_addr addr;
2168         struct inet6_dev    * idev;
2169
2170         ASSERT_RTNL();
2171
2172         if ((dev->type != ARPHRD_ETHER) &&
2173             (dev->type != ARPHRD_FDDI) &&
2174             (dev->type != ARPHRD_IEEE802_TR) &&
2175             (dev->type != ARPHRD_ARCNET) &&
2176             (dev->type != ARPHRD_INFINIBAND)) {
2177                 /* Alas, we support only Ethernet autoconfiguration. */
2178                 return;
2179         }
2180
2181         idev = addrconf_add_dev(dev);
2182         if (idev == NULL)
2183                 return;
2184
2185         memset(&addr, 0, sizeof(struct in6_addr));
2186         addr.s6_addr32[0] = htonl(0xFE800000);
2187
2188         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2189                 addrconf_add_linklocal(idev, &addr);
2190 }
2191
2192 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2193 static void addrconf_sit_config(struct net_device *dev)
2194 {
2195         struct inet6_dev *idev;
2196
2197         ASSERT_RTNL();
2198
2199         /*
2200          * Configure the tunnel with one of our IPv4
2201          * addresses... we should configure all of
2202          * our v4 addrs in the tunnel
2203          */
2204
2205         if ((idev = ipv6_find_idev(dev)) == NULL) {
2206                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2207                 return;
2208         }
2209
2210         sit_add_v4_addrs(idev);
2211
2212         if (dev->flags&IFF_POINTOPOINT) {
2213                 addrconf_add_mroute(dev);
2214                 addrconf_add_lroute(dev);
2215         } else
2216                 sit_route_add(dev);
2217 }
2218 #endif
2219
2220 static inline int
2221 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2222 {
2223         struct in6_addr lladdr;
2224
2225         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2226                 addrconf_add_linklocal(idev, &lladdr);
2227                 return 0;
2228         }
2229         return -1;
2230 }
2231
2232 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2233 {
2234         struct net_device *link_dev;
2235
2236         /* first try to inherit the link-local address from the link device */
2237         if (idev->dev->iflink &&
2238             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2239                 if (!ipv6_inherit_linklocal(idev, link_dev))
2240                         return;
2241         }
2242         /* then try to inherit it from any device */
2243         for_each_netdev(&init_net, link_dev) {
2244                 if (!ipv6_inherit_linklocal(idev, link_dev))
2245                         return;
2246         }
2247         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2248 }
2249
2250 /*
2251  * Autoconfigure tunnel with a link-local address so routing protocols,
2252  * DHCPv6, MLD etc. can be run over the virtual link
2253  */
2254
2255 static void addrconf_ip6_tnl_config(struct net_device *dev)
2256 {
2257         struct inet6_dev *idev;
2258
2259         ASSERT_RTNL();
2260
2261         if ((idev = addrconf_add_dev(dev)) == NULL) {
2262                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2263                 return;
2264         }
2265         ip6_tnl_add_linklocal(idev);
2266 }
2267
2268 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2269                            void * data)
2270 {
2271         struct net_device *dev = (struct net_device *) data;
2272         struct inet6_dev *idev = __in6_dev_get(dev);
2273         int run_pending = 0;
2274         int err;
2275
2276         if (dev->nd_net != &init_net)
2277                 return NOTIFY_DONE;
2278
2279         switch(event) {
2280         case NETDEV_REGISTER:
2281                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2282                         idev = ipv6_add_dev(dev);
2283                         if (!idev)
2284                                 return notifier_from_errno(-ENOMEM);
2285                 }
2286                 break;
2287         case NETDEV_UP:
2288         case NETDEV_CHANGE:
2289                 if (dev->flags & IFF_SLAVE)
2290                         break;
2291
2292                 if (event == NETDEV_UP) {
2293                         if (!addrconf_qdisc_ok(dev)) {
2294                                 /* device is not ready yet. */
2295                                 printk(KERN_INFO
2296                                         "ADDRCONF(NETDEV_UP): %s: "
2297                                         "link is not ready\n",
2298                                         dev->name);
2299                                 break;
2300                         }
2301
2302                         if (idev)
2303                                 idev->if_flags |= IF_READY;
2304                 } else {
2305                         if (!addrconf_qdisc_ok(dev)) {
2306                                 /* device is still not ready. */
2307                                 break;
2308                         }
2309
2310                         if (idev) {
2311                                 if (idev->if_flags & IF_READY) {
2312                                         /* device is already configured. */
2313                                         break;
2314                                 }
2315                                 idev->if_flags |= IF_READY;
2316                         }
2317
2318                         printk(KERN_INFO
2319                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2320                                         "link becomes ready\n",
2321                                         dev->name);
2322
2323                         run_pending = 1;
2324                 }
2325
2326                 switch(dev->type) {
2327 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2328                 case ARPHRD_SIT:
2329                         addrconf_sit_config(dev);
2330                         break;
2331 #endif
2332                 case ARPHRD_TUNNEL6:
2333                         addrconf_ip6_tnl_config(dev);
2334                         break;
2335                 case ARPHRD_LOOPBACK:
2336                         init_loopback(dev);
2337                         break;
2338
2339                 default:
2340                         addrconf_dev_config(dev);
2341                         break;
2342                 }
2343                 if (idev) {
2344                         if (run_pending)
2345                                 addrconf_dad_run(idev);
2346
2347                         /* If the MTU changed during the interface down, when the
2348                            interface up, the changed MTU must be reflected in the
2349                            idev as well as routers.
2350                          */
2351                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2352                                 rt6_mtu_change(dev, dev->mtu);
2353                                 idev->cnf.mtu6 = dev->mtu;
2354                         }
2355                         idev->tstamp = jiffies;
2356                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2357                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2358                            stop IPv6 on this interface.
2359                          */
2360                         if (dev->mtu < IPV6_MIN_MTU)
2361                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2362                 }
2363                 break;
2364
2365         case NETDEV_CHANGEMTU:
2366                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2367                         rt6_mtu_change(dev, dev->mtu);
2368                         idev->cnf.mtu6 = dev->mtu;
2369                         break;
2370                 }
2371
2372                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2373
2374         case NETDEV_DOWN:
2375         case NETDEV_UNREGISTER:
2376                 /*
2377                  *      Remove all addresses from this interface.
2378                  */
2379                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2380                 break;
2381
2382         case NETDEV_CHANGENAME:
2383                 if (idev) {
2384                         snmp6_unregister_dev(idev);
2385 #ifdef CONFIG_SYSCTL
2386                         addrconf_sysctl_unregister(&idev->cnf);
2387                         neigh_sysctl_unregister(idev->nd_parms);
2388                         neigh_sysctl_register(dev, idev->nd_parms,
2389                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2390                                               &ndisc_ifinfo_sysctl_change,
2391                                               NULL);
2392                         addrconf_sysctl_register(idev, &idev->cnf);
2393 #endif
2394                         err = snmp6_register_dev(idev);
2395                         if (err)
2396                                 return notifier_from_errno(err);
2397                 }
2398                 break;
2399         }
2400
2401         return NOTIFY_OK;
2402 }
2403
2404 /*
2405  *      addrconf module should be notified of a device going up
2406  */
2407 static struct notifier_block ipv6_dev_notf = {
2408         .notifier_call = addrconf_notify,
2409         .priority = 0
2410 };
2411
2412 static int addrconf_ifdown(struct net_device *dev, int how)
2413 {
2414         struct inet6_dev *idev;
2415         struct inet6_ifaddr *ifa, **bifa;
2416         int i;
2417
2418         ASSERT_RTNL();
2419
2420         if (dev == init_net.loopback_dev && how == 1)
2421                 how = 0;
2422
2423         rt6_ifdown(dev);
2424         neigh_ifdown(&nd_tbl, dev);
2425
2426         idev = __in6_dev_get(dev);
2427         if (idev == NULL)
2428                 return -ENODEV;
2429
2430         /* Step 1: remove reference to ipv6 device from parent device.
2431                    Do not dev_put!
2432          */
2433         if (how == 1) {
2434                 idev->dead = 1;
2435
2436                 /* protected by rtnl_lock */
2437                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2438
2439                 /* Step 1.5: remove snmp6 entry */
2440                 snmp6_unregister_dev(idev);
2441
2442         }
2443
2444         /* Step 2: clear hash table */
2445         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2446                 bifa = &inet6_addr_lst[i];
2447
2448                 write_lock_bh(&addrconf_hash_lock);
2449                 while ((ifa = *bifa) != NULL) {
2450                         if (ifa->idev == idev) {
2451                                 *bifa = ifa->lst_next;
2452                                 ifa->lst_next = NULL;
2453                                 addrconf_del_timer(ifa);
2454                                 in6_ifa_put(ifa);
2455                                 continue;
2456                         }
2457                         bifa = &ifa->lst_next;
2458                 }
2459                 write_unlock_bh(&addrconf_hash_lock);
2460         }
2461
2462         write_lock_bh(&idev->lock);
2463
2464         /* Step 3: clear flags for stateless addrconf */
2465         if (how != 1)
2466                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2467
2468         /* Step 4: clear address list */
2469 #ifdef CONFIG_IPV6_PRIVACY
2470         if (how == 1 && del_timer(&idev->regen_timer))
2471                 in6_dev_put(idev);
2472
2473         /* clear tempaddr list */
2474         while ((ifa = idev->tempaddr_list) != NULL) {
2475                 idev->tempaddr_list = ifa->tmp_next;
2476                 ifa->tmp_next = NULL;
2477                 ifa->dead = 1;
2478                 write_unlock_bh(&idev->lock);
2479                 spin_lock_bh(&ifa->lock);
2480
2481                 if (ifa->ifpub) {
2482                         in6_ifa_put(ifa->ifpub);
2483                         ifa->ifpub = NULL;
2484                 }
2485                 spin_unlock_bh(&ifa->lock);
2486                 in6_ifa_put(ifa);
2487                 write_lock_bh(&idev->lock);
2488         }
2489 #endif
2490         while ((ifa = idev->addr_list) != NULL) {
2491                 idev->addr_list = ifa->if_next;
2492                 ifa->if_next = NULL;
2493                 ifa->dead = 1;
2494                 addrconf_del_timer(ifa);
2495                 write_unlock_bh(&idev->lock);
2496
2497                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2498                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2499                 in6_ifa_put(ifa);
2500
2501                 write_lock_bh(&idev->lock);
2502         }
2503         write_unlock_bh(&idev->lock);
2504
2505         /* Step 5: Discard multicast list */
2506
2507         if (how == 1)
2508                 ipv6_mc_destroy_dev(idev);
2509         else
2510                 ipv6_mc_down(idev);
2511
2512         idev->tstamp = jiffies;
2513
2514         /* Shot the device (if unregistered) */
2515
2516         if (how == 1) {
2517 #ifdef CONFIG_SYSCTL
2518                 addrconf_sysctl_unregister(&idev->cnf);
2519                 neigh_sysctl_unregister(idev->nd_parms);
2520 #endif
2521                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2522                 neigh_ifdown(&nd_tbl, dev);
2523                 in6_dev_put(idev);
2524         }
2525         return 0;
2526 }
2527
2528 static void addrconf_rs_timer(unsigned long data)
2529 {
2530         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2531
2532         if (ifp->idev->cnf.forwarding)
2533                 goto out;
2534
2535         if (ifp->idev->if_flags & IF_RA_RCVD) {
2536                 /*
2537                  *      Announcement received after solicitation
2538                  *      was sent
2539                  */
2540                 goto out;
2541         }
2542
2543         spin_lock(&ifp->lock);
2544         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2545                 struct in6_addr all_routers;
2546
2547                 /* The wait after the last probe can be shorter */
2548                 addrconf_mod_timer(ifp, AC_RS,
2549                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2550                                    ifp->idev->cnf.rtr_solicit_delay :
2551                                    ifp->idev->cnf.rtr_solicit_interval);
2552                 spin_unlock(&ifp->lock);
2553
2554                 ipv6_addr_all_routers(&all_routers);
2555
2556                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2557         } else {
2558                 spin_unlock(&ifp->lock);
2559                 /*
2560                  * Note: we do not support deprecated "all on-link"
2561                  * assumption any longer.
2562                  */
2563                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2564                        ifp->idev->dev->name);
2565         }
2566
2567 out:
2568         in6_ifa_put(ifp);
2569 }
2570
2571 /*
2572  *      Duplicate Address Detection
2573  */
2574 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2575 {
2576         unsigned long rand_num;
2577         struct inet6_dev *idev = ifp->idev;
2578
2579         if (ifp->flags & IFA_F_OPTIMISTIC)
2580                 rand_num = 0;
2581         else
2582                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2583
2584         ifp->probes = idev->cnf.dad_transmits;
2585         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2586 }
2587
2588 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2589 {
2590         struct inet6_dev *idev = ifp->idev;
2591         struct net_device *dev = idev->dev;
2592
2593         addrconf_join_solict(dev, &ifp->addr);
2594
2595         net_srandom(ifp->addr.s6_addr32[3]);
2596
2597         read_lock_bh(&idev->lock);
2598         if (ifp->dead)
2599                 goto out;
2600         spin_lock_bh(&ifp->lock);
2601
2602         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2603             !(ifp->flags&IFA_F_TENTATIVE) ||
2604             ifp->flags & IFA_F_NODAD) {
2605                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2606                 spin_unlock_bh(&ifp->lock);
2607                 read_unlock_bh(&idev->lock);
2608
2609                 addrconf_dad_completed(ifp);
2610                 return;
2611         }
2612
2613         if (!(idev->if_flags & IF_READY)) {
2614                 spin_unlock_bh(&ifp->lock);
2615                 read_unlock_bh(&idev->lock);
2616                 /*
2617                  * If the defice is not ready:
2618                  * - keep it tentative if it is a permanent address.
2619                  * - otherwise, kill it.
2620                  */
2621                 in6_ifa_hold(ifp);
2622                 addrconf_dad_stop(ifp);
2623                 return;
2624         }
2625
2626         /*
2627          * Optimistic nodes can start receiving
2628          * Frames right away
2629          */
2630         if(ifp->flags & IFA_F_OPTIMISTIC)
2631                 ip6_ins_rt(ifp->rt);
2632
2633         addrconf_dad_kick(ifp);
2634         spin_unlock_bh(&ifp->lock);
2635 out:
2636         read_unlock_bh(&idev->lock);
2637 }
2638
2639 static void addrconf_dad_timer(unsigned long data)
2640 {
2641         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2642         struct inet6_dev *idev = ifp->idev;
2643         struct in6_addr unspec;
2644         struct in6_addr mcaddr;
2645
2646         read_lock_bh(&idev->lock);
2647         if (idev->dead) {
2648                 read_unlock_bh(&idev->lock);
2649                 goto out;
2650         }
2651         spin_lock_bh(&ifp->lock);
2652         if (ifp->probes == 0) {
2653                 /*
2654                  * DAD was successful
2655                  */
2656
2657                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2658                 spin_unlock_bh(&ifp->lock);
2659                 read_unlock_bh(&idev->lock);
2660
2661                 addrconf_dad_completed(ifp);
2662
2663                 goto out;
2664         }
2665
2666         ifp->probes--;
2667         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2668         spin_unlock_bh(&ifp->lock);
2669         read_unlock_bh(&idev->lock);
2670
2671         /* send a neighbour solicitation for our addr */
2672         memset(&unspec, 0, sizeof(unspec));
2673         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2674         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2675 out:
2676         in6_ifa_put(ifp);
2677 }
2678
2679 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2680 {
2681         struct net_device *     dev = ifp->idev->dev;
2682
2683         /*
2684          *      Configure the address for reception. Now it is valid.
2685          */
2686
2687         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2688
2689         /* If added prefix is link local and forwarding is off,
2690            start sending router solicitations.
2691          */
2692
2693         if (ifp->idev->cnf.forwarding == 0 &&
2694             ifp->idev->cnf.rtr_solicits > 0 &&
2695             (dev->flags&IFF_LOOPBACK) == 0 &&
2696             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2697                 struct in6_addr all_routers;
2698
2699                 ipv6_addr_all_routers(&all_routers);
2700
2701                 /*
2702                  *      If a host as already performed a random delay
2703                  *      [...] as part of DAD [...] there is no need
2704                  *      to delay again before sending the first RS
2705                  */
2706                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2707
2708                 spin_lock_bh(&ifp->lock);
2709                 ifp->probes = 1;
2710                 ifp->idev->if_flags |= IF_RS_SENT;
2711                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2712                 spin_unlock_bh(&ifp->lock);
2713         }
2714 }
2715
2716 static void addrconf_dad_run(struct inet6_dev *idev) {
2717         struct inet6_ifaddr *ifp;
2718
2719         read_lock_bh(&idev->lock);
2720         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2721                 spin_lock_bh(&ifp->lock);
2722                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2723                         spin_unlock_bh(&ifp->lock);
2724                         continue;
2725                 }
2726                 spin_unlock_bh(&ifp->lock);
2727                 addrconf_dad_kick(ifp);
2728         }
2729         read_unlock_bh(&idev->lock);
2730 }
2731
2732 #ifdef CONFIG_PROC_FS
2733 struct if6_iter_state {
2734         int bucket;
2735 };
2736
2737 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2738 {
2739         struct inet6_ifaddr *ifa = NULL;
2740         struct if6_iter_state *state = seq->private;
2741
2742         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2743                 ifa = inet6_addr_lst[state->bucket];
2744                 if (ifa)
2745                         break;
2746         }
2747         return ifa;
2748 }
2749
2750 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2751 {
2752         struct if6_iter_state *state = seq->private;
2753
2754         ifa = ifa->lst_next;
2755 try_again:
2756         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2757                 ifa = inet6_addr_lst[state->bucket];
2758                 goto try_again;
2759         }
2760         return ifa;
2761 }
2762
2763 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2764 {
2765         struct inet6_ifaddr *ifa = if6_get_first(seq);
2766
2767         if (ifa)
2768                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2769                         --pos;
2770         return pos ? NULL : ifa;
2771 }
2772
2773 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2774 {
2775         read_lock_bh(&addrconf_hash_lock);
2776         return if6_get_idx(seq, *pos);
2777 }
2778
2779 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2780 {
2781         struct inet6_ifaddr *ifa;
2782
2783         ifa = if6_get_next(seq, v);
2784         ++*pos;
2785         return ifa;
2786 }
2787
2788 static void if6_seq_stop(struct seq_file *seq, void *v)
2789 {
2790         read_unlock_bh(&addrconf_hash_lock);
2791 }
2792
2793 static int if6_seq_show(struct seq_file *seq, void *v)
2794 {
2795         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2796         seq_printf(seq,
2797                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2798                    NIP6(ifp->addr),
2799                    ifp->idev->dev->ifindex,
2800                    ifp->prefix_len,
2801                    ifp->scope,
2802                    ifp->flags,
2803                    ifp->idev->dev->name);
2804         return 0;
2805 }
2806
2807 static const struct seq_operations if6_seq_ops = {
2808         .start  = if6_seq_start,
2809         .next   = if6_seq_next,
2810         .show   = if6_seq_show,
2811         .stop   = if6_seq_stop,
2812 };
2813
2814 static int if6_seq_open(struct inode *inode, struct file *file)
2815 {
2816         return seq_open_private(file, &if6_seq_ops,
2817                         sizeof(struct if6_iter_state));
2818 }
2819
2820 static const struct file_operations if6_fops = {
2821         .owner          = THIS_MODULE,
2822         .open           = if6_seq_open,
2823         .read           = seq_read,
2824         .llseek         = seq_lseek,
2825         .release        = seq_release_private,
2826 };
2827
2828 int __init if6_proc_init(void)
2829 {
2830         if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2831                 return -ENOMEM;
2832         return 0;
2833 }
2834
2835 void if6_proc_exit(void)
2836 {
2837         proc_net_remove(&init_net, "if_inet6");
2838 }
2839 #endif  /* CONFIG_PROC_FS */
2840
2841 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2842 /* Check if address is a home address configured on any interface. */
2843 int ipv6_chk_home_addr(struct in6_addr *addr)
2844 {
2845         int ret = 0;
2846         struct inet6_ifaddr * ifp;
2847         u8 hash = ipv6_addr_hash(addr);
2848         read_lock_bh(&addrconf_hash_lock);
2849         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2850                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2851                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2852                         ret = 1;
2853                         break;
2854                 }
2855         }
2856         read_unlock_bh(&addrconf_hash_lock);
2857         return ret;
2858 }
2859 #endif
2860
2861 /*
2862  *      Periodic address status verification
2863  */
2864
2865 static void addrconf_verify(unsigned long foo)
2866 {
2867         struct inet6_ifaddr *ifp;
2868         unsigned long now, next;
2869         int i;
2870
2871         spin_lock_bh(&addrconf_verify_lock);
2872         now = jiffies;
2873         next = now + ADDR_CHECK_FREQUENCY;
2874
2875         del_timer(&addr_chk_timer);
2876
2877         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2878
2879 restart:
2880                 read_lock(&addrconf_hash_lock);
2881                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2882                         unsigned long age;
2883 #ifdef CONFIG_IPV6_PRIVACY
2884                         unsigned long regen_advance;
2885 #endif
2886
2887                         if (ifp->flags & IFA_F_PERMANENT)
2888                                 continue;
2889
2890                         spin_lock(&ifp->lock);
2891                         age = (now - ifp->tstamp) / HZ;
2892
2893 #ifdef CONFIG_IPV6_PRIVACY
2894                         regen_advance = ifp->idev->cnf.regen_max_retry *
2895                                         ifp->idev->cnf.dad_transmits *
2896                                         ifp->idev->nd_parms->retrans_time / HZ;
2897 #endif
2898
2899                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2900                             age >= ifp->valid_lft) {
2901                                 spin_unlock(&ifp->lock);
2902                                 in6_ifa_hold(ifp);
2903                                 read_unlock(&addrconf_hash_lock);
2904                                 ipv6_del_addr(ifp);
2905                                 goto restart;
2906                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2907                                 spin_unlock(&ifp->lock);
2908                                 continue;
2909                         } else if (age >= ifp->prefered_lft) {
2910                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2911                                 int deprecate = 0;
2912
2913                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2914                                         deprecate = 1;
2915                                         ifp->flags |= IFA_F_DEPRECATED;
2916                                 }
2917
2918                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2919                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2920
2921                                 spin_unlock(&ifp->lock);
2922
2923                                 if (deprecate) {
2924                                         in6_ifa_hold(ifp);
2925                                         read_unlock(&addrconf_hash_lock);
2926
2927                                         ipv6_ifa_notify(0, ifp);
2928                                         in6_ifa_put(ifp);
2929                                         goto restart;
2930                                 }
2931 #ifdef CONFIG_IPV6_PRIVACY
2932                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2933                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2934                                 if (age >= ifp->prefered_lft - regen_advance) {
2935                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2936                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2937                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2938                                         if (!ifp->regen_count && ifpub) {
2939                                                 ifp->regen_count++;
2940                                                 in6_ifa_hold(ifp);
2941                                                 in6_ifa_hold(ifpub);
2942                                                 spin_unlock(&ifp->lock);
2943                                                 read_unlock(&addrconf_hash_lock);
2944                                                 spin_lock(&ifpub->lock);
2945                                                 ifpub->regen_count = 0;
2946                                                 spin_unlock(&ifpub->lock);
2947                                                 ipv6_create_tempaddr(ifpub, ifp);
2948                                                 in6_ifa_put(ifpub);
2949                                                 in6_ifa_put(ifp);
2950                                                 goto restart;
2951                                         }
2952                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2953                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2954                                 spin_unlock(&ifp->lock);
2955 #endif
2956                         } else {
2957                                 /* ifp->prefered_lft <= ifp->valid_lft */
2958                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2959                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2960                                 spin_unlock(&ifp->lock);
2961                         }
2962                 }
2963                 read_unlock(&addrconf_hash_lock);
2964         }
2965
2966         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2967         add_timer(&addr_chk_timer);
2968         spin_unlock_bh(&addrconf_verify_lock);
2969 }
2970
2971 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2972 {
2973         struct in6_addr *pfx = NULL;
2974
2975         if (addr)
2976                 pfx = nla_data(addr);
2977
2978         if (local) {
2979                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2980                         pfx = NULL;
2981                 else
2982                         pfx = nla_data(local);
2983         }
2984
2985         return pfx;
2986 }
2987
2988 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2989         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2990         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2991         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2992 };
2993
2994 static int
2995 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2996 {
2997         struct ifaddrmsg *ifm;
2998         struct nlattr *tb[IFA_MAX+1];
2999         struct in6_addr *pfx;
3000         int err;
3001
3002         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3003         if (err < 0)
3004                 return err;
3005
3006         ifm = nlmsg_data(nlh);
3007         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3008         if (pfx == NULL)
3009                 return -EINVAL;
3010
3011         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3012 }
3013
3014 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3015                              u32 prefered_lft, u32 valid_lft)
3016 {
3017         u32 flags = RTF_EXPIRES;
3018
3019         if (!valid_lft || (prefered_lft > valid_lft))
3020                 return -EINVAL;
3021
3022         if (valid_lft == INFINITY_LIFE_TIME) {
3023                 ifa_flags |= IFA_F_PERMANENT;
3024                 flags = 0;
3025         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3026                 valid_lft = 0x7FFFFFFF/HZ;
3027
3028         if (prefered_lft == 0)
3029                 ifa_flags |= IFA_F_DEPRECATED;
3030         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3031                  (prefered_lft != INFINITY_LIFE_TIME))
3032                 prefered_lft = 0x7FFFFFFF/HZ;
3033
3034         spin_lock_bh(&ifp->lock);
3035         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3036         ifp->tstamp = jiffies;
3037         ifp->valid_lft = valid_lft;
3038         ifp->prefered_lft = prefered_lft;
3039
3040         spin_unlock_bh(&ifp->lock);
3041         if (!(ifp->flags&IFA_F_TENTATIVE))
3042                 ipv6_ifa_notify(0, ifp);
3043
3044         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3045                               jiffies_to_clock_t(valid_lft * HZ), flags);
3046         addrconf_verify(0);
3047
3048         return 0;
3049 }
3050
3051 static int
3052 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3053 {
3054         struct ifaddrmsg *ifm;
3055         struct nlattr *tb[IFA_MAX+1];
3056         struct in6_addr *pfx;
3057         struct inet6_ifaddr *ifa;
3058         struct net_device *dev;
3059         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3060         u8 ifa_flags;
3061         int err;
3062
3063         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3064         if (err < 0)
3065                 return err;
3066
3067         ifm = nlmsg_data(nlh);
3068         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3069         if (pfx == NULL)
3070                 return -EINVAL;
3071
3072         if (tb[IFA_CACHEINFO]) {
3073                 struct ifa_cacheinfo *ci;
3074
3075                 ci = nla_data(tb[IFA_CACHEINFO]);
3076                 valid_lft = ci->ifa_valid;
3077                 preferred_lft = ci->ifa_prefered;
3078         } else {
3079                 preferred_lft = INFINITY_LIFE_TIME;
3080                 valid_lft = INFINITY_LIFE_TIME;
3081         }
3082
3083         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3084         if (dev == NULL)
3085                 return -ENODEV;
3086
3087         /* We ignore other flags so far. */
3088         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3089
3090         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3091         if (ifa == NULL) {
3092                 /*
3093                  * It would be best to check for !NLM_F_CREATE here but
3094                  * userspace alreay relies on not having to provide this.
3095                  */
3096                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3097                                       ifa_flags, preferred_lft, valid_lft);
3098         }
3099
3100         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3101             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3102                 err = -EEXIST;
3103         else
3104                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3105
3106         in6_ifa_put(ifa);
3107
3108         return err;
3109 }
3110
3111 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3112                           u8 scope, int ifindex)
3113 {
3114         struct ifaddrmsg *ifm;
3115
3116         ifm = nlmsg_data(nlh);
3117         ifm->ifa_family = AF_INET6;
3118         ifm->ifa_prefixlen = prefixlen;
3119         ifm->ifa_flags = flags;
3120         ifm->ifa_scope = scope;
3121         ifm->ifa_index = ifindex;
3122 }
3123
3124 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3125                          unsigned long tstamp, u32 preferred, u32 valid)
3126 {
3127         struct ifa_cacheinfo ci;
3128
3129         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3130                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3131         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3132                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3133         ci.ifa_prefered = preferred;
3134         ci.ifa_valid = valid;
3135
3136         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3137 }
3138
3139 static inline int rt_scope(int ifa_scope)
3140 {
3141         if (ifa_scope & IFA_HOST)
3142                 return RT_SCOPE_HOST;
3143         else if (ifa_scope & IFA_LINK)
3144                 return RT_SCOPE_LINK;
3145         else if (ifa_scope & IFA_SITE)
3146                 return RT_SCOPE_SITE;
3147         else
3148                 return RT_SCOPE_UNIVERSE;
3149 }
3150
3151 static inline int inet6_ifaddr_msgsize(void)
3152 {
3153         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3154                + nla_total_size(16) /* IFA_ADDRESS */
3155                + nla_total_size(sizeof(struct ifa_cacheinfo));
3156 }
3157
3158 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3159                              u32 pid, u32 seq, int event, unsigned int flags)
3160 {
3161         struct nlmsghdr  *nlh;
3162         u32 preferred, valid;
3163
3164         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3165         if (nlh == NULL)
3166                 return -EMSGSIZE;
3167
3168         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3169                       ifa->idev->dev->ifindex);
3170
3171         if (!(ifa->flags&IFA_F_PERMANENT)) {
3172                 preferred = ifa->prefered_lft;
3173                 valid = ifa->valid_lft;
3174                 if (preferred != INFINITY_LIFE_TIME) {
3175                         long tval = (jiffies - ifa->tstamp)/HZ;
3176                         preferred -= tval;
3177                         if (valid != INFINITY_LIFE_TIME)
3178                                 valid -= tval;
3179                 }
3180         } else {
3181                 preferred = INFINITY_LIFE_TIME;
3182                 valid = INFINITY_LIFE_TIME;
3183         }
3184
3185         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3186             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3187                 nlmsg_cancel(skb, nlh);
3188                 return -EMSGSIZE;
3189         }
3190
3191         return nlmsg_end(skb, nlh);
3192 }
3193
3194 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3195                                 u32 pid, u32 seq, int event, u16 flags)
3196 {
3197         struct nlmsghdr  *nlh;
3198         u8 scope = RT_SCOPE_UNIVERSE;
3199         int ifindex = ifmca->idev->dev->ifindex;
3200
3201         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3202                 scope = RT_SCOPE_SITE;
3203
3204         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3205         if (nlh == NULL)
3206                 return -EMSGSIZE;
3207
3208         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3209         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3210             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3211                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3212                 nlmsg_cancel(skb, nlh);
3213                 return -EMSGSIZE;
3214         }
3215
3216         return nlmsg_end(skb, nlh);
3217 }
3218
3219 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3220                                 u32 pid, u32 seq, int event, unsigned int flags)
3221 {
3222         struct nlmsghdr  *nlh;
3223         u8 scope = RT_SCOPE_UNIVERSE;
3224         int ifindex = ifaca->aca_idev->dev->ifindex;
3225
3226         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3227                 scope = RT_SCOPE_SITE;
3228
3229         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3230         if (nlh == NULL)
3231                 return -EMSGSIZE;
3232
3233         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3234         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3235             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3236                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3237                 nlmsg_cancel(skb, nlh);
3238                 return -EMSGSIZE;
3239         }
3240
3241         return nlmsg_end(skb, nlh);
3242 }
3243
3244 enum addr_type_t
3245 {
3246         UNICAST_ADDR,
3247         MULTICAST_ADDR,
3248         ANYCAST_ADDR,
3249 };
3250
3251 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3252                            enum addr_type_t type)
3253 {
3254         int idx, ip_idx;
3255         int s_idx, s_ip_idx;
3256         int err = 1;
3257         struct net_device *dev;
3258         struct inet6_dev *idev = NULL;
3259         struct inet6_ifaddr *ifa;
3260         struct ifmcaddr6 *ifmca;
3261         struct ifacaddr6 *ifaca;
3262
3263         s_idx = cb->args[0];
3264         s_ip_idx = ip_idx = cb->args[1];
3265
3266         idx = 0;
3267         for_each_netdev(&init_net, dev) {
3268                 if (idx < s_idx)
3269                         goto cont;
3270                 if (idx > s_idx)
3271                         s_ip_idx = 0;
3272                 ip_idx = 0;
3273                 if ((idev = in6_dev_get(dev)) == NULL)
3274                         goto cont;
3275                 read_lock_bh(&idev->lock);
3276                 switch (type) {
3277                 case UNICAST_ADDR:
3278                         /* unicast address incl. temp addr */
3279                         for (ifa = idev->addr_list; ifa;
3280                              ifa = ifa->if_next, ip_idx++) {
3281                                 if (ip_idx < s_ip_idx)
3282                                         continue;
3283                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3284                                     NETLINK_CB(cb->skb).pid,
3285                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3286                                     NLM_F_MULTI)) <= 0)
3287                                         goto done;
3288                         }
3289                         break;
3290                 case MULTICAST_ADDR:
3291                         /* multicast address */
3292                         for (ifmca = idev->mc_list; ifmca;
3293                              ifmca = ifmca->next, ip_idx++) {
3294                                 if (ip_idx < s_ip_idx)
3295                                         continue;
3296                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3297                                     NETLINK_CB(cb->skb).pid,
3298                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3299                                     NLM_F_MULTI)) <= 0)
3300                                         goto done;
3301                         }
3302                         break;
3303                 case ANYCAST_ADDR:
3304                         /* anycast address */
3305                         for (ifaca = idev->ac_list; ifaca;
3306                              ifaca = ifaca->aca_next, ip_idx++) {
3307                                 if (ip_idx < s_ip_idx)
3308                                         continue;
3309                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3310                                     NETLINK_CB(cb->skb).pid,
3311                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3312                                     NLM_F_MULTI)) <= 0)
3313                                         goto done;
3314                         }
3315                         break;
3316                 default:
3317                         break;
3318                 }
3319                 read_unlock_bh(&idev->lock);
3320                 in6_dev_put(idev);
3321 cont:
3322                 idx++;
3323         }
3324 done:
3325         if (err <= 0) {
3326                 read_unlock_bh(&idev->lock);
3327                 in6_dev_put(idev);
3328         }
3329         cb->args[0] = idx;
3330         cb->args[1] = ip_idx;
3331         return skb->len;
3332 }
3333
3334 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3335 {
3336         enum addr_type_t type = UNICAST_ADDR;
3337         return inet6_dump_addr(skb, cb, type);
3338 }
3339
3340 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3341 {
3342         enum addr_type_t type = MULTICAST_ADDR;
3343         return inet6_dump_addr(skb, cb, type);
3344 }
3345
3346
3347 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3348 {
3349         enum addr_type_t type = ANYCAST_ADDR;
3350         return inet6_dump_addr(skb, cb, type);
3351 }
3352
3353 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3354                              void *arg)
3355 {
3356         struct ifaddrmsg *ifm;
3357         struct nlattr *tb[IFA_MAX+1];
3358         struct in6_addr *addr = NULL;
3359         struct net_device *dev = NULL;
3360         struct inet6_ifaddr *ifa;
3361         struct sk_buff *skb;
3362         int err;
3363
3364         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3365         if (err < 0)
3366                 goto errout;
3367
3368         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3369         if (addr == NULL) {
3370                 err = -EINVAL;
3371                 goto errout;
3372         }
3373
3374         ifm = nlmsg_data(nlh);
3375         if (ifm->ifa_index)
3376                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3377
3378         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3379                 err = -EADDRNOTAVAIL;
3380                 goto errout;
3381         }
3382
3383         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3384                 err = -ENOBUFS;
3385                 goto errout_ifa;
3386         }
3387
3388         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3389                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3390         if (err < 0) {
3391                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3392                 WARN_ON(err == -EMSGSIZE);
3393                 kfree_skb(skb);
3394                 goto errout_ifa;
3395         }
3396         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3397 errout_ifa:
3398         in6_ifa_put(ifa);
3399 errout:
3400         return err;
3401 }
3402
3403 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3404 {
3405         struct sk_buff *skb;
3406         int err = -ENOBUFS;
3407
3408         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3409         if (skb == NULL)
3410                 goto errout;
3411
3412         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3413         if (err < 0) {
3414                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3415                 WARN_ON(err == -EMSGSIZE);
3416                 kfree_skb(skb);
3417                 goto errout;
3418         }
3419         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3420 errout:
3421         if (err < 0)
3422                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3423 }
3424
3425 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3426                                 __s32 *array, int bytes)
3427 {
3428         BUG_ON(bytes < (DEVCONF_MAX * 4));
3429
3430         memset(array, 0, bytes);
3431         array[DEVCONF_FORWARDING] = cnf->forwarding;
3432         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3433         array[DEVCONF_MTU6] = cnf->mtu6;
3434         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3435         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3436         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3437         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3438         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3439         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3440         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3441         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3442 #ifdef CONFIG_IPV6_PRIVACY
3443         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3444         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3445         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3446         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3447         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3448 #endif
3449         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3450         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3451         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3452 #ifdef CONFIG_IPV6_ROUTER_PREF
3453         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3454         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3455 #ifdef CONFIG_IPV6_ROUTE_INFO
3456         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3457 #endif
3458 #endif
3459         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3460         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3461 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3462         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3463 #endif
3464 }
3465
3466 static inline size_t inet6_if_nlmsg_size(void)
3467 {
3468         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3469                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3470                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3471                + nla_total_size(4) /* IFLA_MTU */
3472                + nla_total_size(4) /* IFLA_LINK */
3473                + nla_total_size( /* IFLA_PROTINFO */
3474                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3475                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3476                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3477                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3478                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3479                  );
3480 }
3481
3482 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3483                                       int bytes)
3484 {
3485         int i;
3486         int pad = bytes - sizeof(u64) * items;
3487         BUG_ON(pad < 0);
3488
3489         /* Use put_unaligned() because stats may not be aligned for u64. */
3490         put_unaligned(items, &stats[0]);
3491         for (i = 1; i < items; i++)
3492                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3493
3494         memset(&stats[items], 0, pad);
3495 }
3496
3497 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3498                              int bytes)
3499 {
3500         switch(attrtype) {
3501         case IFLA_INET6_STATS:
3502                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3503                 break;
3504         case IFLA_INET6_ICMP6STATS:
3505                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3506                 break;
3507         }
3508 }
3509
3510 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3511                              u32 pid, u32 seq, int event, unsigned int flags)
3512 {
3513         struct net_device *dev = idev->dev;
3514         struct nlattr *nla;
3515         struct ifinfomsg *hdr;
3516         struct nlmsghdr *nlh;
3517         void *protoinfo;
3518         struct ifla_cacheinfo ci;
3519
3520         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3521         if (nlh == NULL)
3522                 return -EMSGSIZE;
3523
3524         hdr = nlmsg_data(nlh);
3525         hdr->ifi_family = AF_INET6;
3526         hdr->__ifi_pad = 0;
3527         hdr->ifi_type = dev->type;
3528         hdr->ifi_index = dev->ifindex;
3529         hdr->ifi_flags = dev_get_flags(dev);
3530         hdr->ifi_change = 0;
3531
3532         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3533
3534         if (dev->addr_len)
3535                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3536
3537         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3538         if (dev->ifindex != dev->iflink)
3539                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3540
3541         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3542         if (protoinfo == NULL)
3543                 goto nla_put_failure;
3544
3545         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3546
3547         ci.max_reasm_len = IPV6_MAXPLEN;
3548         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3549                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3550         ci.reachable_time = idev->nd_parms->reachable_time;
3551         ci.retrans_time = idev->nd_parms->retrans_time;
3552         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3553
3554         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3555         if (nla == NULL)
3556                 goto nla_put_failure;
3557         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3558
3559         /* XXX - MC not implemented */
3560
3561         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3562         if (nla == NULL)
3563                 goto nla_put_failure;
3564         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3565
3566         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3567         if (nla == NULL)
3568                 goto nla_put_failure;
3569         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3570
3571         nla_nest_end(skb, protoinfo);
3572         return nlmsg_end(skb, nlh);
3573
3574 nla_put_failure:
3575         nlmsg_cancel(skb, nlh);
3576         return -EMSGSIZE;
3577 }
3578
3579 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3580 {
3581         int idx, err;
3582         int s_idx = cb->args[0];
3583         struct net_device *dev;
3584         struct inet6_dev *idev;
3585
3586         read_lock(&dev_base_lock);
3587         idx = 0;
3588         for_each_netdev(&init_net, dev) {
3589                 if (idx < s_idx)
3590                         goto cont;
3591                 if ((idev = in6_dev_get(dev)) == NULL)
3592                         goto cont;
3593                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3594                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3595                 in6_dev_put(idev);
3596                 if (err <= 0)
3597                         break;
3598 cont:
3599                 idx++;
3600         }
3601         read_unlock(&dev_base_lock);
3602         cb->args[0] = idx;
3603
3604         return skb->len;
3605 }
3606
3607 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3608 {
3609         struct sk_buff *skb;
3610         int err = -ENOBUFS;
3611
3612         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3613         if (skb == NULL)
3614                 goto errout;
3615
3616         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3617         if (err < 0) {
3618                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3619                 WARN_ON(err == -EMSGSIZE);
3620                 kfree_skb(skb);
3621                 goto errout;
3622         }
3623         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3624 errout:
3625         if (err < 0)
3626                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3627 }
3628
3629 static inline size_t inet6_prefix_nlmsg_size(void)
3630 {
3631         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3632                + nla_total_size(sizeof(struct in6_addr))
3633                + nla_total_size(sizeof(struct prefix_cacheinfo));
3634 }
3635
3636 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3637                              struct prefix_info *pinfo, u32 pid, u32 seq,
3638                              int event, unsigned int flags)
3639 {
3640         struct prefixmsg *pmsg;
3641         struct nlmsghdr *nlh;
3642         struct prefix_cacheinfo ci;
3643
3644         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3645         if (nlh == NULL)
3646                 return -EMSGSIZE;
3647
3648         pmsg = nlmsg_data(nlh);
3649         pmsg->prefix_family = AF_INET6;
3650         pmsg->prefix_pad1 = 0;
3651         pmsg->prefix_pad2 = 0;
3652         pmsg->prefix_ifindex = idev->dev->ifindex;
3653         pmsg->prefix_len = pinfo->prefix_len;
3654         pmsg->prefix_type = pinfo->type;
3655         pmsg->prefix_pad3 = 0;
3656         pmsg->prefix_flags = 0;
3657         if (pinfo->onlink)
3658                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3659         if (pinfo->autoconf)
3660                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3661
3662         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3663
3664         ci.preferred_time = ntohl(pinfo->prefered);
3665         ci.valid_time = ntohl(pinfo->valid);
3666         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3667
3668         return nlmsg_end(skb, nlh);
3669
3670 nla_put_failure:
3671         nlmsg_cancel(skb, nlh);
3672         return -EMSGSIZE;
3673 }
3674
3675 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3676                          struct prefix_info *pinfo)
3677 {
3678         struct sk_buff *skb;
3679         int err = -ENOBUFS;
3680
3681         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3682         if (skb == NULL)
3683                 goto errout;
3684
3685         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3686         if (err < 0) {
3687                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3688                 WARN_ON(err == -EMSGSIZE);
3689                 kfree_skb(skb);
3690                 goto errout;
3691         }
3692         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3693 errout:
3694         if (err < 0)
3695                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3696 }
3697
3698 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3699 {
3700         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3701
3702         switch (event) {
3703         case RTM_NEWADDR:
3704                 /*
3705                  * If the address was optimistic
3706                  * we inserted the route at the start of
3707                  * our DAD process, so we don't need
3708                  * to do it again
3709                  */
3710                 if (!(ifp->rt->rt6i_node))
3711                         ip6_ins_rt(ifp->rt);
3712                 if (ifp->idev->cnf.forwarding)
3713                         addrconf_join_anycast(ifp);
3714                 break;
3715         case RTM_DELADDR:
3716                 if (ifp->idev->cnf.forwarding)
3717                         addrconf_leave_anycast(ifp);
3718                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3719                 dst_hold(&ifp->rt->u.dst);
3720                 if (ip6_del_rt(ifp->rt))
3721                         dst_free(&ifp->rt->u.dst);
3722                 break;
3723         }
3724 }
3725
3726 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3727 {
3728         rcu_read_lock_bh();
3729         if (likely(ifp->idev->dead == 0))
3730                 __ipv6_ifa_notify(event, ifp);
3731         rcu_read_unlock_bh();
3732 }
3733
3734 #ifdef CONFIG_SYSCTL
3735
3736 static
3737 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3738                            void __user *buffer, size_t *lenp, loff_t *ppos)
3739 {
3740         int *valp = ctl->data;
3741         int val = *valp;
3742         int ret;
3743
3744         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3745
3746         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3747                 if (valp != &ipv6_devconf.forwarding) {
3748                         if ((!*valp) ^ (!val)) {
3749                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3750                                 if (idev == NULL)
3751                                         return ret;
3752                                 dev_forward_change(idev);
3753                         }
3754                 } else {
3755                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3756                         addrconf_forward_change();
3757                 }
3758                 if (*valp)
3759                         rt6_purge_dflt_routers();
3760         }
3761
3762         return ret;
3763 }
3764
3765 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3766                                             int __user *name, int nlen,
3767                                             void __user *oldval,
3768                                             size_t __user *oldlenp,
3769                                             void __user *newval, size_t newlen)
3770 {
3771         int *valp = table->data;
3772         int new;
3773
3774         if (!newval || !newlen)
3775                 return 0;
3776         if (newlen != sizeof(int))
3777                 return -EINVAL;
3778         if (get_user(new, (int __user *)newval))
3779                 return -EFAULT;
3780         if (new == *valp)
3781                 return 0;
3782         if (oldval && oldlenp) {
3783                 size_t len;
3784                 if (get_user(len, oldlenp))
3785                         return -EFAULT;
3786                 if (len) {
3787                         if (len > table->maxlen)
3788                                 len = table->maxlen;
3789                         if (copy_to_user(oldval, valp, len))
3790                                 return -EFAULT;
3791                         if (put_user(len, oldlenp))
3792                                 return -EFAULT;
3793                 }
3794         }
3795
3796         if (valp != &ipv6_devconf_dflt.forwarding) {
3797                 if (valp != &ipv6_devconf.forwarding) {
3798                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3799                         int changed;
3800                         if (unlikely(idev == NULL))
3801                                 return -ENODEV;
3802                         changed = (!*valp) ^ (!new);
3803                         *valp = new;
3804                         if (changed)
3805                                 dev_forward_change(idev);
3806                 } else {
3807                         *valp = new;
3808                         addrconf_forward_change();
3809                 }
3810
3811                 if (*valp)
3812                         rt6_purge_dflt_routers();
3813         } else
3814                 *valp = new;
3815
3816         return 1;
3817 }
3818
3819 static struct addrconf_sysctl_table
3820 {
3821         struct ctl_table_header *sysctl_header;
3822         ctl_table addrconf_vars[__NET_IPV6_MAX];
3823         ctl_table addrconf_dev[2];
3824         ctl_table addrconf_conf_dir[2];
3825         ctl_table addrconf_proto_dir[2];
3826         ctl_table addrconf_root_dir[2];
3827 } addrconf_sysctl __read_mostly = {
3828         .sysctl_header = NULL,
3829         .addrconf_vars = {
3830                 {
3831                         .ctl_name       =       NET_IPV6_FORWARDING,
3832                         .procname       =       "forwarding",
3833                         .data           =       &ipv6_devconf.forwarding,
3834                         .maxlen         =       sizeof(int),
3835                         .mode           =       0644,
3836                         .proc_handler   =       &addrconf_sysctl_forward,
3837                         .strategy       =       &addrconf_sysctl_forward_strategy,
3838                 },
3839                 {
3840                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3841                         .procname       =       "hop_limit",
3842                         .data           =       &ipv6_devconf.hop_limit,
3843                         .maxlen         =       sizeof(int),
3844                         .mode           =       0644,
3845                         .proc_handler   =       proc_dointvec,
3846                 },
3847                 {
3848                         .ctl_name       =       NET_IPV6_MTU,
3849                         .procname       =       "mtu",
3850                         .data           =       &ipv6_devconf.mtu6,
3851                         .maxlen         =       sizeof(int),
3852                         .mode           =       0644,
3853                         .proc_handler   =       &proc_dointvec,
3854                 },
3855                 {
3856                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3857                         .procname       =       "accept_ra",
3858                         .data           =       &ipv6_devconf.accept_ra,
3859                         .maxlen         =       sizeof(int),
3860                         .mode           =       0644,
3861                         .proc_handler   =       &proc_dointvec,
3862                 },
3863                 {
3864                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3865                         .procname       =       "accept_redirects",
3866                         .data           =       &ipv6_devconf.accept_redirects,
3867                         .maxlen         =       sizeof(int),
3868                         .mode           =       0644,
3869                         .proc_handler   =       &proc_dointvec,
3870                 },
3871                 {
3872                         .ctl_name       =       NET_IPV6_AUTOCONF,
3873                         .procname       =       "autoconf",
3874                         .data           =       &ipv6_devconf.autoconf,
3875                         .maxlen         =       sizeof(int),
3876                         .mode           =       0644,
3877                         .proc_handler   =       &proc_dointvec,
3878                 },
3879                 {
3880                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3881                         .procname       =       "dad_transmits",
3882                         .data           =       &ipv6_devconf.dad_transmits,
3883                         .maxlen         =       sizeof(int),
3884                         .mode           =       0644,
3885                         .proc_handler   =       &proc_dointvec,
3886                 },
3887                 {
3888                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3889                         .procname       =       "router_solicitations",
3890                         .data           =       &ipv6_devconf.rtr_solicits,
3891                         .maxlen         =       sizeof(int),
3892                         .mode           =       0644,
3893                         .proc_handler   =       &proc_dointvec,
3894                 },
3895                 {
3896                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3897                         .procname       =       "router_solicitation_interval",
3898                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3899                         .maxlen         =       sizeof(int),
3900                         .mode           =       0644,
3901                         .proc_handler   =       &proc_dointvec_jiffies,
3902                         .strategy       =       &sysctl_jiffies,
3903                 },
3904                 {
3905                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3906                         .procname       =       "router_solicitation_delay",
3907                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3908                         .maxlen         =       sizeof(int),
3909                         .mode           =       0644,
3910                         .proc_handler   =       &proc_dointvec_jiffies,
3911                         .strategy       =       &sysctl_jiffies,
3912                 },
3913                 {
3914                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3915                         .procname       =       "force_mld_version",
3916                         .data           =       &ipv6_devconf.force_mld_version,
3917                         .maxlen         =       sizeof(int),
3918                         .mode           =       0644,
3919                         .proc_handler   =       &proc_dointvec,
3920                 },
3921 #ifdef CONFIG_IPV6_PRIVACY
3922                 {
3923                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3924                         .procname       =       "use_tempaddr",
3925                         .data           =       &ipv6_devconf.use_tempaddr,
3926                         .maxlen         =       sizeof(int),
3927                         .mode           =       0644,
3928                         .proc_handler   =       &proc_dointvec,
3929                 },
3930                 {
3931                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3932                         .procname       =       "temp_valid_lft",
3933                         .data           =       &ipv6_devconf.temp_valid_lft,
3934                         .maxlen         =       sizeof(int),
3935                         .mode           =       0644,
3936                         .proc_handler   =       &proc_dointvec,
3937                 },
3938                 {
3939                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3940                         .procname       =       "temp_prefered_lft",
3941                         .data           =       &ipv6_devconf.temp_prefered_lft,
3942                         .maxlen         =       sizeof(int),
3943                         .mode           =       0644,
3944                         .proc_handler   =       &proc_dointvec,
3945                 },
3946                 {
3947                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3948                         .procname       =       "regen_max_retry",
3949                         .data           =       &ipv6_devconf.regen_max_retry,
3950                         .maxlen         =       sizeof(int),
3951                         .mode           =       0644,
3952                         .proc_handler   =       &proc_dointvec,
3953                 },
3954                 {
3955                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3956                         .procname       =       "max_desync_factor",
3957                         .data           =       &ipv6_devconf.max_desync_factor,
3958                         .maxlen         =       sizeof(int),
3959                         .mode           =       0644,
3960                         .proc_handler   =       &proc_dointvec,
3961                 },
3962 #endif
3963                 {
3964                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3965                         .procname       =       "max_addresses",
3966                         .data           =       &ipv6_devconf.max_addresses,
3967                         .maxlen         =       sizeof(int),
3968                         .mode           =       0644,
3969                         .proc_handler   =       &proc_dointvec,
3970                 },
3971                 {
3972                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3973                         .procname       =       "accept_ra_defrtr",
3974                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3975                         .maxlen         =       sizeof(int),
3976                         .mode           =       0644,
3977                         .proc_handler   =       &proc_dointvec,
3978                 },
3979                 {
3980                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3981                         .procname       =       "accept_ra_pinfo",
3982                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3983                         .maxlen         =       sizeof(int),
3984                         .mode           =       0644,
3985                         .proc_handler   =       &proc_dointvec,
3986                 },
3987 #ifdef CONFIG_IPV6_ROUTER_PREF
3988                 {
3989                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3990                         .procname       =       "accept_ra_rtr_pref",
3991                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3992                         .maxlen         =       sizeof(int),
3993                         .mode           =       0644,
3994                         .proc_handler   =       &proc_dointvec,
3995                 },
3996                 {
3997                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3998                         .procname       =       "router_probe_interval",
3999                         .data           =       &ipv6_devconf.rtr_probe_interval,
4000                         .maxlen         =       sizeof(int),
4001                         .mode           =       0644,
4002                         .proc_handler   =       &proc_dointvec_jiffies,
4003                         .strategy       =       &sysctl_jiffies,
4004                 },
4005 #ifdef CONFIG_IPV6_ROUTE_INFO
4006                 {
4007                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4008                         .procname       =       "accept_ra_rt_info_max_plen",
4009                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4010                         .maxlen         =       sizeof(int),
4011                         .mode           =       0644,
4012                         .proc_handler   =       &proc_dointvec,
4013                 },
4014 #endif
4015 #endif
4016                 {
4017                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4018                         .procname       =       "proxy_ndp",
4019                         .data           =       &ipv6_devconf.proxy_ndp,
4020                         .maxlen         =       sizeof(int),
4021                         .mode           =       0644,
4022                         .proc_handler   =       &proc_dointvec,
4023                 },
4024                 {
4025                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4026                         .procname       =       "accept_source_route",
4027                         .data           =       &ipv6_devconf.accept_source_route,
4028                         .maxlen         =       sizeof(int),
4029                         .mode           =       0644,
4030                         .proc_handler   =       &proc_dointvec,
4031                 },
4032 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4033                 {
4034                         .ctl_name       =       CTL_UNNUMBERED,
4035                         .procname       =       "optimistic_dad",
4036                         .data           =       &ipv6_devconf.optimistic_dad,
4037                         .maxlen         =       sizeof(int),
4038                         .mode           =       0644,
4039                         .proc_handler   =       &proc_dointvec,
4040
4041                 },
4042 #endif
4043                 {
4044                         .ctl_name       =       0,      /* sentinel */
4045                 }
4046         },
4047         .addrconf_dev = {
4048                 {
4049                         .ctl_name       =       NET_PROTO_CONF_ALL,
4050                         .procname       =       "all",
4051                         .mode           =       0555,
4052                         .child          =       addrconf_sysctl.addrconf_vars,
4053                 },
4054                 {
4055                         .ctl_name       =       0,      /* sentinel */
4056                 }
4057         },
4058         .addrconf_conf_dir = {
4059                 {
4060                         .ctl_name       =       NET_IPV6_CONF,
4061                         .procname       =       "conf",
4062                         .mode           =       0555,
4063                         .child          =       addrconf_sysctl.addrconf_dev,
4064                 },
4065                 {
4066                         .ctl_name       =       0,      /* sentinel */
4067                 }
4068         },
4069         .addrconf_proto_dir = {
4070                 {
4071                         .ctl_name       =       NET_IPV6,
4072                         .procname       =       "ipv6",
4073                         .mode           =       0555,
4074                         .child          =       addrconf_sysctl.addrconf_conf_dir,
4075                 },
4076                 {
4077                         .ctl_name       =       0,      /* sentinel */
4078                 }
4079         },
4080         .addrconf_root_dir = {
4081                 {
4082                         .ctl_name       =       CTL_NET,
4083                         .procname       =       "net",
4084                         .mode           =       0555,
4085                         .child          =       addrconf_sysctl.addrconf_proto_dir,
4086                 },
4087                 {
4088                         .ctl_name       =       0,      /* sentinel */
4089                 }
4090         },
4091 };
4092
4093 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4094 {
4095         int i;
4096         struct net_device *dev = idev ? idev->dev : NULL;
4097         struct addrconf_sysctl_table *t;
4098         char *dev_name = NULL;
4099
4100         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4101         if (t == NULL)
4102                 return;
4103         for (i=0; t->addrconf_vars[i].data; i++) {
4104                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4105                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4106         }
4107         if (dev) {
4108                 dev_name = dev->name;
4109                 t->addrconf_dev[0].ctl_name = dev->ifindex;
4110         } else {
4111                 dev_name = "default";
4112                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4113         }
4114
4115         /*
4116          * Make a copy of dev_name, because '.procname' is regarded as const
4117          * by sysctl and we wouldn't want anyone to change it under our feet
4118          * (see SIOCSIFNAME).
4119          */
4120         dev_name = kstrdup(dev_name, GFP_KERNEL);
4121         if (!dev_name)
4122             goto free;
4123
4124         t->addrconf_dev[0].procname = dev_name;
4125
4126         t->addrconf_dev[0].child = t->addrconf_vars;
4127         t->addrconf_conf_dir[0].child = t->addrconf_dev;
4128         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4129         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4130
4131         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4132         if (t->sysctl_header == NULL)
4133                 goto free_procname;
4134         else
4135                 p->sysctl = t;
4136         return;
4137
4138         /* error path */
4139  free_procname:
4140         kfree(dev_name);
4141  free:
4142         kfree(t);
4143
4144         return;
4145 }
4146
4147 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4148 {
4149         if (p->sysctl) {
4150                 struct addrconf_sysctl_table *t = p->sysctl;
4151                 p->sysctl = NULL;
4152                 unregister_sysctl_table(t->sysctl_header);
4153                 kfree(t->addrconf_dev[0].procname);
4154                 kfree(t);
4155         }
4156 }
4157
4158
4159 #endif
4160
4161 /*
4162  *      Device notifier
4163  */
4164
4165 int register_inet6addr_notifier(struct notifier_block *nb)
4166 {
4167         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4168 }
4169
4170 EXPORT_SYMBOL(register_inet6addr_notifier);
4171
4172 int unregister_inet6addr_notifier(struct notifier_block *nb)
4173 {
4174         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4175 }
4176
4177 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4178
4179 /*
4180  *      Init / cleanup code
4181  */
4182
4183 int __init addrconf_init(void)
4184 {
4185         int err = 0;
4186
4187         /* The addrconf netdev notifier requires that loopback_dev
4188          * has it's ipv6 private information allocated and setup
4189          * before it can bring up and give link-local addresses
4190          * to other devices which are up.
4191          *
4192          * Unfortunately, loopback_dev is not necessarily the first
4193          * entry in the global dev_base list of net devices.  In fact,
4194          * it is likely to be the very last entry on that list.
4195          * So this causes the notifier registry below to try and
4196          * give link-local addresses to all devices besides loopback_dev
4197          * first, then loopback_dev, which cases all the non-loopback_dev
4198          * devices to fail to get a link-local address.
4199          *
4200          * So, as a temporary fix, allocate the ipv6 structure for
4201          * loopback_dev first by hand.
4202          * Longer term, all of the dependencies ipv6 has upon the loopback
4203          * device and it being up should be removed.
4204          */
4205         rtnl_lock();
4206         if (!ipv6_add_dev(init_net.loopback_dev))
4207                 err = -ENOMEM;
4208         rtnl_unlock();
4209         if (err)
4210                 return err;
4211
4212         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4213         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4214 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4215         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4216         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4217         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4218         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4219 #endif
4220
4221         register_netdevice_notifier(&ipv6_dev_notf);
4222
4223         addrconf_verify(0);
4224
4225         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4226         if (err < 0)
4227                 goto errout;
4228
4229         /* Only the first call to __rtnl_register can fail */
4230         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4231         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4232         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4233         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4234         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4235
4236 #ifdef CONFIG_SYSCTL
4237         addrconf_sysctl.sysctl_header =
4238                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4239         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4240 #endif
4241
4242         return 0;
4243 errout:
4244         unregister_netdevice_notifier(&ipv6_dev_notf);
4245
4246         return err;
4247 }
4248
4249 void __exit addrconf_cleanup(void)
4250 {
4251         struct net_device *dev;
4252         struct inet6_ifaddr *ifa;
4253         int i;
4254
4255         unregister_netdevice_notifier(&ipv6_dev_notf);
4256
4257 #ifdef CONFIG_SYSCTL
4258         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4259         addrconf_sysctl_unregister(&ipv6_devconf);
4260 #endif
4261
4262         rtnl_lock();
4263
4264         /*
4265          *      clean dev list.
4266          */
4267
4268         for_each_netdev(&init_net, dev) {
4269                 if (__in6_dev_get(dev) == NULL)
4270                         continue;
4271                 addrconf_ifdown(dev, 1);
4272         }
4273         addrconf_ifdown(init_net.loopback_dev, 2);
4274
4275         /*
4276          *      Check hash table.
4277          */
4278
4279         write_lock_bh(&addrconf_hash_lock);
4280         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4281                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4282                         struct inet6_ifaddr *bifa;
4283
4284                         bifa = ifa;
4285                         ifa = ifa->lst_next;
4286                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4287                         /* Do not free it; something is wrong.
4288                            Now we can investigate it with debugger.
4289                          */
4290                 }
4291         }
4292         write_unlock_bh(&addrconf_hash_lock);
4293
4294         del_timer(&addr_chk_timer);
4295
4296         rtnl_unlock();
4297
4298 #ifdef CONFIG_PROC_FS
4299         proc_net_remove(&init_net, "if_inet6");
4300 #endif
4301 }