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   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <asm/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90
  91 /* Set to 3 to get tracing... */
  92 #define ACONF_DEBUG 2
  93
  94 #if ACONF_DEBUG >= 3
  95 #define ADBG(x) printk x
  96 #else
  97 #define ADBG(x)
  98 #endif
  99
 100 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 102
 103 #ifdef CONFIG_SYSCTL
 104 static void addrconf_sysctl_register(struct inet6_dev *idev, 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         if (snmp_mib_init((void **)idev->stats.ipv6,
 259                           sizeof(struct ipstats_mib),
 260                           __alignof__(struct ipstats_mib)) < 0)
 261                 goto err_ip;
 262         if (snmp_mib_init((void **)idev->stats.icmpv6,
 263                           sizeof(struct icmpv6_mib),
 264                           __alignof__(struct icmpv6_mib)) < 0)
 265                 goto err_icmp;
 266         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 267                           sizeof(struct icmpv6msg_mib),
 268                           __alignof__(struct icmpv6msg_mib)) < 0)
 269                 goto err_icmpmsg;
 270
 271         return 0;
 272
 273 err_icmpmsg:
 274         snmp_mib_free((void **)idev->stats.icmpv6);
 275 err_icmp:
 276         snmp_mib_free((void **)idev->stats.ipv6);
 277 err_ip:
 278         return -ENOMEM;
 279 }
 280
 281 static void snmp6_free_dev(struct inet6_dev *idev)
 282 {
 283         snmp_mib_free((void **)idev->stats.icmpv6msg);
 284         snmp_mib_free((void **)idev->stats.icmpv6);
 285         snmp_mib_free((void **)idev->stats.ipv6);
 286 }
 287
 288 /* Nobody refers to this device, we may destroy it. */
 289
 290 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 291 {
 292         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 293         kfree(idev);
 294 }
 295
 296 void in6_dev_finish_destroy(struct inet6_dev *idev)
 297 {
 298         struct net_device *dev = idev->dev;
 299         BUG_TRAP(idev->addr_list==NULL);
 300         BUG_TRAP(idev->mc_list==NULL);
 301 #ifdef NET_REFCNT_DEBUG
 302         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 303 #endif
 304         dev_put(dev);
 305         if (!idev->dead) {
 306                 printk("Freeing alive inet6 device %p\n", idev);
 307                 return;
 308         }
 309         snmp6_free_dev(idev);
 310         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 311 }
 312
 313 EXPORT_SYMBOL(in6_dev_finish_destroy);
 314
 315 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 316 {
 317         struct inet6_dev *ndev;
 318         struct in6_addr maddr;
 319
 320         ASSERT_RTNL();
 321
 322         if (dev->mtu < IPV6_MIN_MTU)
 323                 return NULL;
 324
 325         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 326
 327         if (ndev == NULL)
 328                 return NULL;
 329
 330         rwlock_init(&ndev->lock);
 331         ndev->dev = dev;
 332         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 333         ndev->cnf.mtu6 = dev->mtu;
 334         ndev->cnf.sysctl = NULL;
 335         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 336         if (ndev->nd_parms == NULL) {
 337                 kfree(ndev);
 338                 return NULL;
 339         }
 340         /* We refer to the device */
 341         dev_hold(dev);
 342
 343         if (snmp6_alloc_dev(ndev) < 0) {
 344                 ADBG((KERN_WARNING
 345                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 346                         __FUNCTION__, dev->name));
 347                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 348                 ndev->dead = 1;
 349                 in6_dev_finish_destroy(ndev);
 350                 return NULL;
 351         }
 352
 353         if (snmp6_register_dev(ndev) < 0) {
 354                 ADBG((KERN_WARNING
 355                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 356                         __FUNCTION__, dev->name));
 357                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 358                 ndev->dead = 1;
 359                 in6_dev_finish_destroy(ndev);
 360                 return NULL;
 361         }
 362
 363         /* One reference from device.  We must do this before
 364          * we invoke __ipv6_regen_rndid().
 365          */
 366         in6_dev_hold(ndev);
 367
 368 #ifdef CONFIG_IPV6_PRIVACY
 369         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 370         if ((dev->flags&IFF_LOOPBACK) ||
 371             dev->type == ARPHRD_TUNNEL ||
 372 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 373             dev->type == ARPHRD_SIT ||
 374 #endif
 375             dev->type == ARPHRD_NONE) {
 376                 printk(KERN_INFO
 377                        "%s: Disabled Privacy Extensions\n",
 378                        dev->name);
 379                 ndev->cnf.use_tempaddr = -1;
 380         } else {
 381                 in6_dev_hold(ndev);
 382                 ipv6_regen_rndid((unsigned long) ndev);
 383         }
 384 #endif
 385
 386         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 387                 ndev->if_flags |= IF_READY;
 388
 389         ipv6_mc_init_dev(ndev);
 390         ndev->tstamp = jiffies;
 391 #ifdef CONFIG_SYSCTL
 392         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 393                               NET_IPV6_NEIGH, "ipv6",
 394                               &ndisc_ifinfo_sysctl_change,
 395                               NULL);
 396         addrconf_sysctl_register(ndev, &ndev->cnf);
 397 #endif
 398         /* protected by rtnl_lock */
 399         rcu_assign_pointer(dev->ip6_ptr, ndev);
 400
 401         /* Join all-node multicast group */
 402         ipv6_addr_all_nodes(&maddr);
 403         ipv6_dev_mc_inc(dev, &maddr);
 404
 405         return ndev;
 406 }
 407
 408 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 409 {
 410         struct inet6_dev *idev;
 411
 412         ASSERT_RTNL();
 413
 414         if ((idev = __in6_dev_get(dev)) == NULL) {
 415                 if ((idev = ipv6_add_dev(dev)) == NULL)
 416                         return NULL;
 417         }
 418
 419         if (dev->flags&IFF_UP)
 420                 ipv6_mc_up(idev);
 421         return idev;
 422 }
 423
 424 #ifdef CONFIG_SYSCTL
 425 static void dev_forward_change(struct inet6_dev *idev)
 426 {
 427         struct net_device *dev;
 428         struct inet6_ifaddr *ifa;
 429         struct in6_addr addr;
 430
 431         if (!idev)
 432                 return;
 433         dev = idev->dev;
 434         if (dev && (dev->flags & IFF_MULTICAST)) {
 435                 ipv6_addr_all_routers(&addr);
 436
 437                 if (idev->cnf.forwarding)
 438                         ipv6_dev_mc_inc(dev, &addr);
 439                 else
 440                         ipv6_dev_mc_dec(dev, &addr);
 441         }
 442         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 443                 if (ifa->flags&IFA_F_TENTATIVE)
 444                         continue;
 445                 if (idev->cnf.forwarding)
 446                         addrconf_join_anycast(ifa);
 447                 else
 448                         addrconf_leave_anycast(ifa);
 449         }
 450 }
 451
 452
 453 static void addrconf_forward_change(void)
 454 {
 455         struct net_device *dev;
 456         struct inet6_dev *idev;
 457
 458         read_lock(&dev_base_lock);
 459         for_each_netdev(&init_net, dev) {
 460                 rcu_read_lock();
 461                 idev = __in6_dev_get(dev);
 462                 if (idev) {
 463                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 464                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 465                         if (changed)
 466                                 dev_forward_change(idev);
 467                 }
 468                 rcu_read_unlock();
 469         }
 470         read_unlock(&dev_base_lock);
 471 }
 472 #endif
 473
 474 /* Nobody refers to this ifaddr, destroy it */
 475
 476 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 477 {
 478         BUG_TRAP(ifp->if_next==NULL);
 479         BUG_TRAP(ifp->lst_next==NULL);
 480 #ifdef NET_REFCNT_DEBUG
 481         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 482 #endif
 483
 484         in6_dev_put(ifp->idev);
 485
 486         if (del_timer(&ifp->timer))
 487                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 488
 489         if (!ifp->dead) {
 490                 printk("Freeing alive inet6 address %p\n", ifp);
 491                 return;
 492         }
 493         dst_release(&ifp->rt->u.dst);
 494
 495         kfree(ifp);
 496 }
 497
 498 static void
 499 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 500 {
 501         struct inet6_ifaddr *ifa, **ifap;
 502         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 503
 504         /*
 505          * Each device address list is sorted in order of scope -
 506          * global before linklocal.
 507          */
 508         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 509              ifap = &ifa->if_next) {
 510                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 511                         break;
 512         }
 513
 514         ifp->if_next = *ifap;
 515         *ifap = ifp;
 516 }
 517
 518 /* On success it returns ifp with increased reference count */
 519
 520 static struct inet6_ifaddr *
 521 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 522               int scope, u32 flags)
 523 {
 524         struct inet6_ifaddr *ifa = NULL;
 525         struct rt6_info *rt;
 526         int hash;
 527         int err = 0;
 528
 529         rcu_read_lock_bh();
 530         if (idev->dead) {
 531                 err = -ENODEV;                  /*XXX*/
 532                 goto out2;
 533         }
 534
 535         write_lock(&addrconf_hash_lock);
 536
 537         /* Ignore adding duplicate addresses on an interface */
 538         if (ipv6_chk_same_addr(addr, idev->dev)) {
 539                 ADBG(("ipv6_add_addr: already assigned\n"));
 540                 err = -EEXIST;
 541                 goto out;
 542         }
 543
 544         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 545
 546         if (ifa == NULL) {
 547                 ADBG(("ipv6_add_addr: malloc failed\n"));
 548                 err = -ENOBUFS;
 549                 goto out;
 550         }
 551
 552         rt = addrconf_dst_alloc(idev, addr, 0);
 553         if (IS_ERR(rt)) {
 554                 err = PTR_ERR(rt);
 555                 goto out;
 556         }
 557
 558         ipv6_addr_copy(&ifa->addr, addr);
 559
 560         spin_lock_init(&ifa->lock);
 561         init_timer(&ifa->timer);
 562         ifa->timer.data = (unsigned long) ifa;
 563         ifa->scope = scope;
 564         ifa->prefix_len = pfxlen;
 565         ifa->flags = flags | IFA_F_TENTATIVE;
 566         ifa->cstamp = ifa->tstamp = jiffies;
 567
 568         ifa->rt = rt;
 569
 570         /*
 571          * part one of RFC 4429, section 3.3
 572          * We should not configure an address as
 573          * optimistic if we do not yet know the link
 574          * layer address of our nexhop router
 575          */
 576
 577         if (rt->rt6i_nexthop == NULL)
 578                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 579
 580         ifa->idev = idev;
 581         in6_dev_hold(idev);
 582         /* For caller */
 583         in6_ifa_hold(ifa);
 584
 585         /* Add to big hash table */
 586         hash = ipv6_addr_hash(addr);
 587
 588         ifa->lst_next = inet6_addr_lst[hash];
 589         inet6_addr_lst[hash] = ifa;
 590         in6_ifa_hold(ifa);
 591         write_unlock(&addrconf_hash_lock);
 592
 593         write_lock(&idev->lock);
 594         /* Add to inet6_dev unicast addr list. */
 595         ipv6_link_dev_addr(idev, ifa);
 596
 597 #ifdef CONFIG_IPV6_PRIVACY
 598         if (ifa->flags&IFA_F_TEMPORARY) {
 599                 ifa->tmp_next = idev->tempaddr_list;
 600                 idev->tempaddr_list = ifa;
 601                 in6_ifa_hold(ifa);
 602         }
 603 #endif
 604
 605         in6_ifa_hold(ifa);
 606         write_unlock(&idev->lock);
 607 out2:
 608         rcu_read_unlock_bh();
 609
 610         if (likely(err == 0))
 611                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 612         else {
 613                 kfree(ifa);
 614                 ifa = ERR_PTR(err);
 615         }
 616
 617         return ifa;
 618 out:
 619         write_unlock(&addrconf_hash_lock);
 620         goto out2;
 621 }
 622
 623 /* This function wants to get referenced ifp and releases it before return */
 624
 625 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 626 {
 627         struct inet6_ifaddr *ifa, **ifap;
 628         struct inet6_dev *idev = ifp->idev;
 629         int hash;
 630         int deleted = 0, onlink = 0;
 631         unsigned long expires = jiffies;
 632
 633         hash = ipv6_addr_hash(&ifp->addr);
 634
 635         ifp->dead = 1;
 636
 637         write_lock_bh(&addrconf_hash_lock);
 638         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 639              ifap = &ifa->lst_next) {
 640                 if (ifa == ifp) {
 641                         *ifap = ifa->lst_next;
 642                         __in6_ifa_put(ifp);
 643                         ifa->lst_next = NULL;
 644                         break;
 645                 }
 646         }
 647         write_unlock_bh(&addrconf_hash_lock);
 648
 649         write_lock_bh(&idev->lock);
 650 #ifdef CONFIG_IPV6_PRIVACY
 651         if (ifp->flags&IFA_F_TEMPORARY) {
 652                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 653                      ifap = &ifa->tmp_next) {
 654                         if (ifa == ifp) {
 655                                 *ifap = ifa->tmp_next;
 656                                 if (ifp->ifpub) {
 657                                         in6_ifa_put(ifp->ifpub);
 658                                         ifp->ifpub = NULL;
 659                                 }
 660                                 __in6_ifa_put(ifp);
 661                                 ifa->tmp_next = NULL;
 662                                 break;
 663                         }
 664                 }
 665         }
 666 #endif
 667
 668         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 669                 if (ifa == ifp) {
 670                         *ifap = ifa->if_next;
 671                         __in6_ifa_put(ifp);
 672                         ifa->if_next = NULL;
 673                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 674                                 break;
 675                         deleted = 1;
 676                         continue;
 677                 } else if (ifp->flags & IFA_F_PERMANENT) {
 678                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 679                                               ifp->prefix_len)) {
 680                                 if (ifa->flags & IFA_F_PERMANENT) {
 681                                         onlink = 1;
 682                                         if (deleted)
 683                                                 break;
 684                                 } else {
 685                                         unsigned long lifetime;
 686
 687                                         if (!onlink)
 688                                                 onlink = -1;
 689
 690                                         spin_lock(&ifa->lock);
 691                                         lifetime = min_t(unsigned long,
 692                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 693                                         if (time_before(expires,
 694                                                         ifa->tstamp + lifetime * HZ))
 695                                                 expires = ifa->tstamp + lifetime * HZ;
 696                                         spin_unlock(&ifa->lock);
 697                                 }
 698                         }
 699                 }
 700                 ifap = &ifa->if_next;
 701         }
 702         write_unlock_bh(&idev->lock);
 703
 704         ipv6_ifa_notify(RTM_DELADDR, ifp);
 705
 706         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 707
 708         addrconf_del_timer(ifp);
 709
 710         /*
 711          * Purge or update corresponding prefix
 712          *
 713          * 1) we don't purge prefix here if address was not permanent.
 714          *    prefix is managed by its own lifetime.
 715          * 2) if there're no addresses, delete prefix.
 716          * 3) if there're still other permanent address(es),
 717          *    corresponding prefix is still permanent.
 718          * 4) otherwise, update prefix lifetime to the
 719          *    longest valid lifetime among the corresponding
 720          *    addresses on the device.
 721          *    Note: subsequent RA will update lifetime.
 722          *
 723          * --yoshfuji
 724          */
 725         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 726                 struct in6_addr prefix;
 727                 struct rt6_info *rt;
 728
 729                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 730                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 731
 732                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 733                         if (onlink == 0) {
 734                                 ip6_del_rt(rt);
 735                                 rt = NULL;
 736                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 737                                 rt->rt6i_expires = expires;
 738                                 rt->rt6i_flags |= RTF_EXPIRES;
 739                         }
 740                 }
 741                 dst_release(&rt->u.dst);
 742         }
 743
 744         in6_ifa_put(ifp);
 745 }
 746
 747 #ifdef CONFIG_IPV6_PRIVACY
 748 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 749 {
 750         struct inet6_dev *idev = ifp->idev;
 751         struct in6_addr addr, *tmpaddr;
 752         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 753         int tmp_plen;
 754         int ret = 0;
 755         int max_addresses;
 756         u32 addr_flags;
 757
 758         write_lock(&idev->lock);
 759         if (ift) {
 760                 spin_lock_bh(&ift->lock);
 761                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 762                 spin_unlock_bh(&ift->lock);
 763                 tmpaddr = &addr;
 764         } else {
 765                 tmpaddr = NULL;
 766         }
 767 retry:
 768         in6_dev_hold(idev);
 769         if (idev->cnf.use_tempaddr <= 0) {
 770                 write_unlock(&idev->lock);
 771                 printk(KERN_INFO
 772                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 773                 in6_dev_put(idev);
 774                 ret = -1;
 775                 goto out;
 776         }
 777         spin_lock_bh(&ifp->lock);
 778         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 779                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 780                 spin_unlock_bh(&ifp->lock);
 781                 write_unlock(&idev->lock);
 782                 printk(KERN_WARNING
 783                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 784                 in6_dev_put(idev);
 785                 ret = -1;
 786                 goto out;
 787         }
 788         in6_ifa_hold(ifp);
 789         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 790         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 791                 spin_unlock_bh(&ifp->lock);
 792                 write_unlock(&idev->lock);
 793                 printk(KERN_WARNING
 794                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 795                 in6_ifa_put(ifp);
 796                 in6_dev_put(idev);
 797                 ret = -1;
 798                 goto out;
 799         }
 800         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 801         tmp_valid_lft = min_t(__u32,
 802                               ifp->valid_lft,
 803                               idev->cnf.temp_valid_lft);
 804         tmp_prefered_lft = min_t(__u32,
 805                                  ifp->prefered_lft,
 806                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 807         tmp_plen = ifp->prefix_len;
 808         max_addresses = idev->cnf.max_addresses;
 809         tmp_cstamp = ifp->cstamp;
 810         tmp_tstamp = ifp->tstamp;
 811         spin_unlock_bh(&ifp->lock);
 812
 813         write_unlock(&idev->lock);
 814
 815         addr_flags = IFA_F_TEMPORARY;
 816         /* set in addrconf_prefix_rcv() */
 817         if (ifp->flags & IFA_F_OPTIMISTIC)
 818                 addr_flags |= IFA_F_OPTIMISTIC;
 819
 820         ift = !max_addresses ||
 821               ipv6_count_addresses(idev) < max_addresses ?
 822                 ipv6_add_addr(idev, &addr, tmp_plen,
 823                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 824                               addr_flags) : NULL;
 825         if (!ift || IS_ERR(ift)) {
 826                 in6_ifa_put(ifp);
 827                 in6_dev_put(idev);
 828                 printk(KERN_INFO
 829                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 830                 tmpaddr = &addr;
 831                 write_lock(&idev->lock);
 832                 goto retry;
 833         }
 834
 835         spin_lock_bh(&ift->lock);
 836         ift->ifpub = ifp;
 837         ift->valid_lft = tmp_valid_lft;
 838         ift->prefered_lft = tmp_prefered_lft;
 839         ift->cstamp = tmp_cstamp;
 840         ift->tstamp = tmp_tstamp;
 841         spin_unlock_bh(&ift->lock);
 842
 843         addrconf_dad_start(ift, 0);
 844         in6_ifa_put(ift);
 845         in6_dev_put(idev);
 846 out:
 847         return ret;
 848 }
 849 #endif
 850
 851 /*
 852  *      Choose an appropriate source address (RFC3484)
 853  */
 854 struct ipv6_saddr_score {
 855         int             addr_type;
 856         unsigned int    attrs;
 857         int             matchlen;
 858         int             scope;
 859         unsigned int    rule;
 860 };
 861
 862 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 863 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 864 #define IPV6_SADDR_SCORE_HOA            0x0008
 865 #define IPV6_SADDR_SCORE_OIF            0x0010
 866 #define IPV6_SADDR_SCORE_LABEL          0x0020
 867 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 868
 869 static inline int ipv6_saddr_preferred(int type)
 870 {
 871         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 872                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 873                 return 1;
 874         return 0;
 875 }
 876
 877 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 878                        struct in6_addr *daddr, struct in6_addr *saddr)
 879 {
 880         struct ipv6_saddr_score hiscore;
 881         struct inet6_ifaddr *ifa_result = NULL;
 882         int daddr_type = __ipv6_addr_type(daddr);
 883         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 884         int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
 885         u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
 886         struct net_device *dev;
 887
 888         memset(&hiscore, 0, sizeof(hiscore));
 889
 890         read_lock(&dev_base_lock);
 891         rcu_read_lock();
 892
 893         for_each_netdev(&init_net, dev) {
 894                 struct inet6_dev *idev;
 895                 struct inet6_ifaddr *ifa;
 896
 897                 /* Rule 0: Candidate Source Address (section 4)
 898                  *  - multicast and link-local destination address,
 899                  *    the set of candidate source address MUST only
 900                  *    include addresses assigned to interfaces
 901                  *    belonging to the same link as the outgoing
 902                  *    interface.
 903                  * (- For site-local destination addresses, the
 904                  *    set of candidate source addresses MUST only
 905                  *    include addresses assigned to interfaces
 906                  *    belonging to the same site as the outgoing
 907                  *    interface.)
 908                  */
 909                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 910                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 911                     daddr_dev && dev != daddr_dev)
 912                         continue;
 913
 914                 idev = __in6_dev_get(dev);
 915                 if (!idev)
 916                         continue;
 917
 918                 read_lock_bh(&idev->lock);
 919                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 920                         struct ipv6_saddr_score score;
 921
 922                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 923
 924                         /* Rule 0:
 925                          * - Tentative Address (RFC2462 section 5.4)
 926                          *  - A tentative address is not considered
 927                          *    "assigned to an interface" in the traditional
 928                          *    sense, unless it is also flagged as optimistic.
 929                          * - Candidate Source Address (section 4)
 930                          *  - In any case, anycast addresses, multicast
 931                          *    addresses, and the unspecified address MUST
 932                          *    NOT be included in a candidate set.
 933                          */
 934                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 935                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 936                                 continue;
 937                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 938                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 939                                 LIMIT_NETDEBUG(KERN_DEBUG
 940                                                "ADDRCONF: unspecified / multicast address "
 941                                                "assigned as unicast address on %s",
 942                                                dev->name);
 943                                 continue;
 944                         }
 945
 946                         score.attrs = 0;
 947                         score.matchlen = 0;
 948                         score.scope = 0;
 949                         score.rule = 0;
 950
 951                         if (ifa_result == NULL) {
 952                                 /* record it if the first available entry */
 953                                 goto record_it;
 954                         }
 955
 956                         /* Rule 1: Prefer same address */
 957                         if (hiscore.rule < 1) {
 958                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 959                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 960                                 hiscore.rule++;
 961                         }
 962                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 963                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 964                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 965                                         score.rule = 1;
 966                                         goto record_it;
 967                                 }
 968                         } else {
 969                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 970                                         continue;
 971                         }
 972
 973                         /* Rule 2: Prefer appropriate scope */
 974                         if (hiscore.rule < 2) {
 975                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 976                                 hiscore.rule++;
 977                         }
 978                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 979                         if (hiscore.scope < score.scope) {
 980                                 if (hiscore.scope < daddr_scope) {
 981                                         score.rule = 2;
 982                                         goto record_it;
 983                                 } else
 984                                         continue;
 985                         } else if (score.scope < hiscore.scope) {
 986                                 if (score.scope < daddr_scope)
 987                                         break; /* addresses sorted by scope */
 988                                 else {
 989                                         score.rule = 2;
 990                                         goto record_it;
 991                                 }
 992                         }
 993
 994                         /* Rule 3: Avoid deprecated and optimistic addresses */
 995                         if (hiscore.rule < 3) {
 996                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 997                                    (((ifa_result->flags &
 998                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
 999                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1000                                 hiscore.rule++;
1001                         }
1002                         if (ipv6_saddr_preferred(score.addr_type) ||
1003                            (((ifa->flags &
1004                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1005                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1006                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1007                                         score.rule = 3;
1008                                         goto record_it;
1009                                 }
1010                         } else {
1011                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1012                                         continue;
1013                         }
1014
1015                         /* Rule 4: Prefer home address */
1016 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1017                         if (hiscore.rule < 4) {
1018                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1019                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1020                                 hiscore.rule++;
1021                         }
1022                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1023                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1024                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1025                                         score.rule = 4;
1026                                         goto record_it;
1027                                 }
1028                         } else {
1029                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1030                                         continue;
1031                         }
1032 #else
1033                         if (hiscore.rule < 4)
1034                                 hiscore.rule++;
1035 #endif
1036
1037                         /* Rule 5: Prefer outgoing interface */
1038                         if (hiscore.rule < 5) {
1039                                 if (daddr_dev == NULL ||
1040                                     daddr_dev == ifa_result->idev->dev)
1041                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1042                                 hiscore.rule++;
1043                         }
1044                         if (daddr_dev == NULL ||
1045                             daddr_dev == ifa->idev->dev) {
1046                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1047                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1048                                         score.rule = 5;
1049                                         goto record_it;
1050                                 }
1051                         } else {
1052                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1053                                         continue;
1054                         }
1055
1056                         /* Rule 6: Prefer matching label */
1057                         if (hiscore.rule < 6) {
1058                                 if (ipv6_addr_label(&ifa_result->addr,
1059                                                     hiscore.addr_type,
1060                                                     ifa_result->idev->dev->ifindex) == daddr_label)
1061                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1062                                 hiscore.rule++;
1063                         }
1064                         if (ipv6_addr_label(&ifa->addr,
1065                                             score.addr_type,
1066                                             ifa->idev->dev->ifindex) == daddr_label) {
1067                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1068                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1069                                         score.rule = 6;
1070                                         goto record_it;
1071                                 }
1072                         } else {
1073                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1074                                         continue;
1075                         }
1076
1077 #ifdef CONFIG_IPV6_PRIVACY
1078                         /* Rule 7: Prefer public address
1079                          * Note: prefer temprary address if use_tempaddr >= 2
1080                          */
1081                         if (hiscore.rule < 7) {
1082                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1083                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1084                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1085                                 hiscore.rule++;
1086                         }
1087                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1088                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1089                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1090                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1091                                         score.rule = 7;
1092                                         goto record_it;
1093                                 }
1094                         } else {
1095                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1096                                         continue;
1097                         }
1098 #else
1099                         if (hiscore.rule < 7)
1100                                 hiscore.rule++;
1101 #endif
1102                         /* Rule 8: Use longest matching prefix */
1103                         if (hiscore.rule < 8) {
1104                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1105                                 hiscore.rule++;
1106                         }
1107                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1108                         if (score.matchlen > hiscore.matchlen) {
1109                                 score.rule = 8;
1110                                 goto record_it;
1111                         }
1112 #if 0
1113                         else if (score.matchlen < hiscore.matchlen)
1114                                 continue;
1115 #endif
1116
1117                         /* Final Rule: choose first available one */
1118                         continue;
1119 record_it:
1120                         if (ifa_result)
1121                                 in6_ifa_put(ifa_result);
1122                         in6_ifa_hold(ifa);
1123                         ifa_result = ifa;
1124                         hiscore = score;
1125                 }
1126                 read_unlock_bh(&idev->lock);
1127         }
1128         rcu_read_unlock();
1129         read_unlock(&dev_base_lock);
1130
1131         if (!ifa_result)
1132                 return -EADDRNOTAVAIL;
1133
1134         ipv6_addr_copy(saddr, &ifa_result->addr);
1135         in6_ifa_put(ifa_result);
1136         return 0;
1137 }
1138
1139
1140 int ipv6_get_saddr(struct dst_entry *dst,
1141                    struct in6_addr *daddr, struct in6_addr *saddr)
1142 {
1143         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1144 }
1145
1146 EXPORT_SYMBOL(ipv6_get_saddr);
1147
1148 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1149                     unsigned char banned_flags)
1150 {
1151         struct inet6_dev *idev;
1152         int err = -EADDRNOTAVAIL;
1153
1154         rcu_read_lock();
1155         if ((idev = __in6_dev_get(dev)) != NULL) {
1156                 struct inet6_ifaddr *ifp;
1157
1158                 read_lock_bh(&idev->lock);
1159                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1160                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1161                                 ipv6_addr_copy(addr, &ifp->addr);
1162                                 err = 0;
1163                                 break;
1164                         }
1165                 }
1166                 read_unlock_bh(&idev->lock);
1167         }
1168         rcu_read_unlock();
1169         return err;
1170 }
1171
1172 static int ipv6_count_addresses(struct inet6_dev *idev)
1173 {
1174         int cnt = 0;
1175         struct inet6_ifaddr *ifp;
1176
1177         read_lock_bh(&idev->lock);
1178         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1179                 cnt++;
1180         read_unlock_bh(&idev->lock);
1181         return cnt;
1182 }
1183
1184 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1185 {
1186         struct inet6_ifaddr * ifp;
1187         u8 hash = ipv6_addr_hash(addr);
1188
1189         read_lock_bh(&addrconf_hash_lock);
1190         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1191                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1192                     !(ifp->flags&IFA_F_TENTATIVE)) {
1193                         if (dev == NULL || ifp->idev->dev == dev ||
1194                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1195                                 break;
1196                 }
1197         }
1198         read_unlock_bh(&addrconf_hash_lock);
1199         return ifp != NULL;
1200 }
1201
1202 EXPORT_SYMBOL(ipv6_chk_addr);
1203
1204 static
1205 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1206 {
1207         struct inet6_ifaddr * ifp;
1208         u8 hash = ipv6_addr_hash(addr);
1209
1210         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1211                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1212                         if (dev == NULL || ifp->idev->dev == dev)
1213                                 break;
1214                 }
1215         }
1216         return ifp != NULL;
1217 }
1218
1219 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1220 {
1221         struct inet6_ifaddr * ifp;
1222         u8 hash = ipv6_addr_hash(addr);
1223
1224         read_lock_bh(&addrconf_hash_lock);
1225         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1226                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1227                         if (dev == NULL || ifp->idev->dev == dev ||
1228                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1229                                 in6_ifa_hold(ifp);
1230                                 break;
1231                         }
1232                 }
1233         }
1234         read_unlock_bh(&addrconf_hash_lock);
1235
1236         return ifp;
1237 }
1238
1239 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1240 {
1241         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1242         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1243         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1244         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1245         int sk_ipv6only = ipv6_only_sock(sk);
1246         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1247         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1248         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1249
1250         if (!sk2_rcv_saddr && !sk_ipv6only)
1251                 return 1;
1252
1253         if (addr_type2 == IPV6_ADDR_ANY &&
1254             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1255                 return 1;
1256
1257         if (addr_type == IPV6_ADDR_ANY &&
1258             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1259                 return 1;
1260
1261         if (sk2_rcv_saddr6 &&
1262             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1263                 return 1;
1264
1265         if (addr_type == IPV6_ADDR_MAPPED &&
1266             !sk2_ipv6only &&
1267             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1268                 return 1;
1269
1270         return 0;
1271 }
1272
1273 /* Gets referenced address, destroys ifaddr */
1274
1275 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1276 {
1277         if (ifp->flags&IFA_F_PERMANENT) {
1278                 spin_lock_bh(&ifp->lock);
1279                 addrconf_del_timer(ifp);
1280                 ifp->flags |= IFA_F_TENTATIVE;
1281                 spin_unlock_bh(&ifp->lock);
1282                 in6_ifa_put(ifp);
1283 #ifdef CONFIG_IPV6_PRIVACY
1284         } else if (ifp->flags&IFA_F_TEMPORARY) {
1285                 struct inet6_ifaddr *ifpub;
1286                 spin_lock_bh(&ifp->lock);
1287                 ifpub = ifp->ifpub;
1288                 if (ifpub) {
1289                         in6_ifa_hold(ifpub);
1290                         spin_unlock_bh(&ifp->lock);
1291                         ipv6_create_tempaddr(ifpub, ifp);
1292                         in6_ifa_put(ifpub);
1293                 } else {
1294                         spin_unlock_bh(&ifp->lock);
1295                 }
1296                 ipv6_del_addr(ifp);
1297 #endif
1298         } else
1299                 ipv6_del_addr(ifp);
1300 }
1301
1302 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1303 {
1304         if (net_ratelimit())
1305                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1306         addrconf_dad_stop(ifp);
1307 }
1308
1309 /* Join to solicited addr multicast group. */
1310
1311 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1312 {
1313         struct in6_addr maddr;
1314
1315         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1316                 return;
1317
1318         addrconf_addr_solict_mult(addr, &maddr);
1319         ipv6_dev_mc_inc(dev, &maddr);
1320 }
1321
1322 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1323 {
1324         struct in6_addr maddr;
1325
1326         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1327                 return;
1328
1329         addrconf_addr_solict_mult(addr, &maddr);
1330         __ipv6_dev_mc_dec(idev, &maddr);
1331 }
1332
1333 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1334 {
1335         struct in6_addr addr;
1336         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1337         if (ipv6_addr_any(&addr))
1338                 return;
1339         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1340 }
1341
1342 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1343 {
1344         struct in6_addr addr;
1345         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1346         if (ipv6_addr_any(&addr))
1347                 return;
1348         __ipv6_dev_ac_dec(ifp->idev, &addr);
1349 }
1350
1351 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1352 {
1353         if (dev->addr_len != ETH_ALEN)
1354                 return -1;
1355         memcpy(eui, dev->dev_addr, 3);
1356         memcpy(eui + 5, dev->dev_addr + 3, 3);
1357
1358         /*
1359          * The zSeries OSA network cards can be shared among various
1360          * OS instances, but the OSA cards have only one MAC address.
1361          * This leads to duplicate address conflicts in conjunction
1362          * with IPv6 if more than one instance uses the same card.
1363          *
1364          * The driver for these cards can deliver a unique 16-bit
1365          * identifier for each instance sharing the same card.  It is
1366          * placed instead of 0xFFFE in the interface identifier.  The
1367          * "u" bit of the interface identifier is not inverted in this
1368          * case.  Hence the resulting interface identifier has local
1369          * scope according to RFC2373.
1370          */
1371         if (dev->dev_id) {
1372                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1373                 eui[4] = dev->dev_id & 0xFF;
1374         } else {
1375                 eui[3] = 0xFF;
1376                 eui[4] = 0xFE;
1377                 eui[0] ^= 2;
1378         }
1379         return 0;
1380 }
1381
1382 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1383 {
1384         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1385         if (dev->addr_len != ARCNET_ALEN)
1386                 return -1;
1387         memset(eui, 0, 7);
1388         eui[7] = *(u8*)dev->dev_addr;
1389         return 0;
1390 }
1391
1392 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1393 {
1394         if (dev->addr_len != INFINIBAND_ALEN)
1395                 return -1;
1396         memcpy(eui, dev->dev_addr + 12, 8);
1397         eui[0] |= 2;
1398         return 0;
1399 }
1400
1401 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1402 {
1403         switch (dev->type) {
1404         case ARPHRD_ETHER:
1405         case ARPHRD_FDDI:
1406         case ARPHRD_IEEE802_TR:
1407                 return addrconf_ifid_eui48(eui, dev);
1408         case ARPHRD_ARCNET:
1409                 return addrconf_ifid_arcnet(eui, dev);
1410         case ARPHRD_INFINIBAND:
1411                 return addrconf_ifid_infiniband(eui, dev);
1412         }
1413         return -1;
1414 }
1415
1416 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1417 {
1418         int err = -1;
1419         struct inet6_ifaddr *ifp;
1420
1421         read_lock_bh(&idev->lock);
1422         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1423                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1424                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1425                         err = 0;
1426                         break;
1427                 }
1428         }
1429         read_unlock_bh(&idev->lock);
1430         return err;
1431 }
1432
1433 #ifdef CONFIG_IPV6_PRIVACY
1434 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1435 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1436 {
1437 regen:
1438         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1439         idev->rndid[0] &= ~0x02;
1440
1441         /*
1442          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1443          * check if generated address is not inappropriate
1444          *
1445          *  - Reserved subnet anycast (RFC 2526)
1446          *      11111101 11....11 1xxxxxxx
1447          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1448          *      00-00-5E-FE-xx-xx-xx-xx
1449          *  - value 0
1450          *  - XXX: already assigned to an address on the device
1451          */
1452         if (idev->rndid[0] == 0xfd &&
1453             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1454             (idev->rndid[7]&0x80))
1455                 goto regen;
1456         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1457                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1458                         goto regen;
1459                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1460                         goto regen;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static void ipv6_regen_rndid(unsigned long data)
1467 {
1468         struct inet6_dev *idev = (struct inet6_dev *) data;
1469         unsigned long expires;
1470
1471         rcu_read_lock_bh();
1472         write_lock_bh(&idev->lock);
1473
1474         if (idev->dead)
1475                 goto out;
1476
1477         if (__ipv6_regen_rndid(idev) < 0)
1478                 goto out;
1479
1480         expires = jiffies +
1481                 idev->cnf.temp_prefered_lft * HZ -
1482                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1483         if (time_before(expires, jiffies)) {
1484                 printk(KERN_WARNING
1485                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1486                         idev->dev->name);
1487                 goto out;
1488         }
1489
1490         if (!mod_timer(&idev->regen_timer, expires))
1491                 in6_dev_hold(idev);
1492
1493 out:
1494         write_unlock_bh(&idev->lock);
1495         rcu_read_unlock_bh();
1496         in6_dev_put(idev);
1497 }
1498
1499 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1500         int ret = 0;
1501
1502         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1503                 ret = __ipv6_regen_rndid(idev);
1504         return ret;
1505 }
1506 #endif
1507
1508 /*
1509  *      Add prefix route.
1510  */
1511
1512 static void
1513 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1514                       unsigned long expires, u32 flags)
1515 {
1516         struct fib6_config cfg = {
1517                 .fc_table = RT6_TABLE_PREFIX,
1518                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1519                 .fc_ifindex = dev->ifindex,
1520                 .fc_expires = expires,
1521                 .fc_dst_len = plen,
1522                 .fc_flags = RTF_UP | flags,
1523         };
1524
1525         ipv6_addr_copy(&cfg.fc_dst, pfx);
1526
1527         /* Prevent useless cloning on PtP SIT.
1528            This thing is done here expecting that the whole
1529            class of non-broadcast devices need not cloning.
1530          */
1531 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1532         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1533                 cfg.fc_flags |= RTF_NONEXTHOP;
1534 #endif
1535
1536         ip6_route_add(&cfg);
1537 }
1538
1539 /* Create "default" multicast route to the interface */
1540
1541 static void addrconf_add_mroute(struct net_device *dev)
1542 {
1543         struct fib6_config cfg = {
1544                 .fc_table = RT6_TABLE_LOCAL,
1545                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1546                 .fc_ifindex = dev->ifindex,
1547                 .fc_dst_len = 8,
1548                 .fc_flags = RTF_UP,
1549         };
1550
1551         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1552
1553         ip6_route_add(&cfg);
1554 }
1555
1556 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1557 static void sit_route_add(struct net_device *dev)
1558 {
1559         struct fib6_config cfg = {
1560                 .fc_table = RT6_TABLE_MAIN,
1561                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1562                 .fc_ifindex = dev->ifindex,
1563                 .fc_dst_len = 96,
1564                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1565         };
1566
1567         /* prefix length - 96 bits "::d.d.d.d" */
1568         ip6_route_add(&cfg);
1569 }
1570 #endif
1571
1572 static void addrconf_add_lroute(struct net_device *dev)
1573 {
1574         struct in6_addr addr;
1575
1576         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1577         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1578 }
1579
1580 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1581 {
1582         struct inet6_dev *idev;
1583
1584         ASSERT_RTNL();
1585
1586         if ((idev = ipv6_find_idev(dev)) == NULL)
1587                 return NULL;
1588
1589         /* Add default multicast route */
1590         addrconf_add_mroute(dev);
1591
1592         /* Add link local route */
1593         addrconf_add_lroute(dev);
1594         return idev;
1595 }
1596
1597 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1598 {
1599         struct prefix_info *pinfo;
1600         __u32 valid_lft;
1601         __u32 prefered_lft;
1602         int addr_type;
1603         unsigned long rt_expires;
1604         struct inet6_dev *in6_dev;
1605
1606         pinfo = (struct prefix_info *) opt;
1607
1608         if (len < sizeof(struct prefix_info)) {
1609                 ADBG(("addrconf: prefix option too short\n"));
1610                 return;
1611         }
1612
1613         /*
1614          *      Validation checks ([ADDRCONF], page 19)
1615          */
1616
1617         addr_type = ipv6_addr_type(&pinfo->prefix);
1618
1619         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1620                 return;
1621
1622         valid_lft = ntohl(pinfo->valid);
1623         prefered_lft = ntohl(pinfo->prefered);
1624
1625         if (prefered_lft > valid_lft) {
1626                 if (net_ratelimit())
1627                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1628                 return;
1629         }
1630
1631         in6_dev = in6_dev_get(dev);
1632
1633         if (in6_dev == NULL) {
1634                 if (net_ratelimit())
1635                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1636                 return;
1637         }
1638
1639         /*
1640          *      Two things going on here:
1641          *      1) Add routes for on-link prefixes
1642          *      2) Configure prefixes with the auto flag set
1643          */
1644
1645         /* Avoid arithmetic overflow. Really, we could
1646            save rt_expires in seconds, likely valid_lft,
1647            but it would require division in fib gc, that it
1648            not good.
1649          */
1650         if (valid_lft >= 0x7FFFFFFF/HZ)
1651                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1652         else
1653                 rt_expires = valid_lft * HZ;
1654
1655         /*
1656          * We convert this (in jiffies) to clock_t later.
1657          * Avoid arithmetic overflow there as well.
1658          * Overflow can happen only if HZ < USER_HZ.
1659          */
1660         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1661                 rt_expires = 0x7FFFFFFF / USER_HZ;
1662
1663         if (pinfo->onlink) {
1664                 struct rt6_info *rt;
1665                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1666
1667                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1668                         if (rt->rt6i_flags&RTF_EXPIRES) {
1669                                 if (valid_lft == 0) {
1670                                         ip6_del_rt(rt);
1671                                         rt = NULL;
1672                                 } else {
1673                                         rt->rt6i_expires = jiffies + rt_expires;
1674                                 }
1675                         }
1676                 } else if (valid_lft) {
1677                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1678                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1679                 }
1680                 if (rt)
1681                         dst_release(&rt->u.dst);
1682         }
1683
1684         /* Try to figure out our local address for this prefix */
1685
1686         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1687                 struct inet6_ifaddr * ifp;
1688                 struct in6_addr addr;
1689                 int create = 0, update_lft = 0;
1690
1691                 if (pinfo->prefix_len == 64) {
1692                         memcpy(&addr, &pinfo->prefix, 8);
1693                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1694                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1695                                 in6_dev_put(in6_dev);
1696                                 return;
1697                         }
1698                         goto ok;
1699                 }
1700                 if (net_ratelimit())
1701                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1702                                pinfo->prefix_len);
1703                 in6_dev_put(in6_dev);
1704                 return;
1705
1706 ok:
1707
1708                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1709
1710                 if (ifp == NULL && valid_lft) {
1711                         int max_addresses = in6_dev->cnf.max_addresses;
1712                         u32 addr_flags = 0;
1713
1714 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1715                         if (in6_dev->cnf.optimistic_dad &&
1716                             !ipv6_devconf.forwarding)
1717                                 addr_flags = IFA_F_OPTIMISTIC;
1718 #endif
1719
1720                         /* Do not allow to create too much of autoconfigured
1721                          * addresses; this would be too easy way to crash kernel.
1722                          */
1723                         if (!max_addresses ||
1724                             ipv6_count_addresses(in6_dev) < max_addresses)
1725                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1726                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1727                                                     addr_flags);
1728
1729                         if (!ifp || IS_ERR(ifp)) {
1730                                 in6_dev_put(in6_dev);
1731                                 return;
1732                         }
1733
1734                         update_lft = create = 1;
1735                         ifp->cstamp = jiffies;
1736                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1737                 }
1738
1739                 if (ifp) {
1740                         int flags;
1741                         unsigned long now;
1742 #ifdef CONFIG_IPV6_PRIVACY
1743                         struct inet6_ifaddr *ift;
1744 #endif
1745                         u32 stored_lft;
1746
1747                         /* update lifetime (RFC2462 5.5.3 e) */
1748                         spin_lock(&ifp->lock);
1749                         now = jiffies;
1750                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1751                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1752                         else
1753                                 stored_lft = 0;
1754                         if (!update_lft && stored_lft) {
1755                                 if (valid_lft > MIN_VALID_LIFETIME ||
1756                                     valid_lft > stored_lft)
1757                                         update_lft = 1;
1758                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1759                                         /* valid_lft <= stored_lft is always true */
1760                                         /* XXX: IPsec */
1761                                         update_lft = 0;
1762                                 } else {
1763                                         valid_lft = MIN_VALID_LIFETIME;
1764                                         if (valid_lft < prefered_lft)
1765                                                 prefered_lft = valid_lft;
1766                                         update_lft = 1;
1767                                 }
1768                         }
1769
1770                         if (update_lft) {
1771                                 ifp->valid_lft = valid_lft;
1772                                 ifp->prefered_lft = prefered_lft;
1773                                 ifp->tstamp = now;
1774                                 flags = ifp->flags;
1775                                 ifp->flags &= ~IFA_F_DEPRECATED;
1776                                 spin_unlock(&ifp->lock);
1777
1778                                 if (!(flags&IFA_F_TENTATIVE))
1779                                         ipv6_ifa_notify(0, ifp);
1780                         } else
1781                                 spin_unlock(&ifp->lock);
1782
1783 #ifdef CONFIG_IPV6_PRIVACY
1784                         read_lock_bh(&in6_dev->lock);
1785                         /* update all temporary addresses in the list */
1786                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1787                                 /*
1788                                  * When adjusting the lifetimes of an existing
1789                                  * temporary address, only lower the lifetimes.
1790                                  * Implementations must not increase the
1791                                  * lifetimes of an existing temporary address
1792                                  * when processing a Prefix Information Option.
1793                                  */
1794                                 spin_lock(&ift->lock);
1795                                 flags = ift->flags;
1796                                 if (ift->valid_lft > valid_lft &&
1797                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1798                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1799                                 if (ift->prefered_lft > prefered_lft &&
1800                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1801                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1802                                 spin_unlock(&ift->lock);
1803                                 if (!(flags&IFA_F_TENTATIVE))
1804                                         ipv6_ifa_notify(0, ift);
1805                         }
1806
1807                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1808                                 /*
1809                                  * When a new public address is created as described in [ADDRCONF],
1810                                  * also create a new temporary address.
1811                                  */
1812                                 read_unlock_bh(&in6_dev->lock);
1813                                 ipv6_create_tempaddr(ifp, NULL);
1814                         } else {
1815                                 read_unlock_bh(&in6_dev->lock);
1816                         }
1817 #endif
1818                         in6_ifa_put(ifp);
1819                         addrconf_verify(0);
1820                 }
1821         }
1822         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1823         in6_dev_put(in6_dev);
1824 }
1825
1826 /*
1827  *      Set destination address.
1828  *      Special case for SIT interfaces where we create a new "virtual"
1829  *      device.
1830  */
1831 int addrconf_set_dstaddr(void __user *arg)
1832 {
1833         struct in6_ifreq ireq;
1834         struct net_device *dev;
1835         int err = -EINVAL;
1836
1837         rtnl_lock();
1838
1839         err = -EFAULT;
1840         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1841                 goto err_exit;
1842
1843         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1844
1845         err = -ENODEV;
1846         if (dev == NULL)
1847                 goto err_exit;
1848
1849 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1850         if (dev->type == ARPHRD_SIT) {
1851                 struct ifreq ifr;
1852                 mm_segment_t    oldfs;
1853                 struct ip_tunnel_parm p;
1854
1855                 err = -EADDRNOTAVAIL;
1856                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1857                         goto err_exit;
1858
1859                 memset(&p, 0, sizeof(p));
1860                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1861                 p.iph.saddr = 0;
1862                 p.iph.version = 4;
1863                 p.iph.ihl = 5;
1864                 p.iph.protocol = IPPROTO_IPV6;
1865                 p.iph.ttl = 64;
1866                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1867
1868                 oldfs = get_fs(); set_fs(KERNEL_DS);
1869                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1870                 set_fs(oldfs);
1871
1872                 if (err == 0) {
1873                         err = -ENOBUFS;
1874                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1875                                 goto err_exit;
1876                         err = dev_open(dev);
1877                 }
1878         }
1879 #endif
1880
1881 err_exit:
1882         rtnl_unlock();
1883         return err;
1884 }
1885
1886 /*
1887  *      Manual configuration of address on an interface
1888  */
1889 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1890                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1891 {
1892         struct inet6_ifaddr *ifp;
1893         struct inet6_dev *idev;
1894         struct net_device *dev;
1895         int scope;
1896         u32 flags = RTF_EXPIRES;
1897
1898         ASSERT_RTNL();
1899
1900         /* check the lifetime */
1901         if (!valid_lft || prefered_lft > valid_lft)
1902                 return -EINVAL;
1903
1904         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1905                 return -ENODEV;
1906
1907         if ((idev = addrconf_add_dev(dev)) == NULL)
1908                 return -ENOBUFS;
1909
1910         scope = ipv6_addr_scope(pfx);
1911
1912         if (valid_lft == INFINITY_LIFE_TIME) {
1913                 ifa_flags |= IFA_F_PERMANENT;
1914                 flags = 0;
1915         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1916                 valid_lft = 0x7FFFFFFF/HZ;
1917
1918         if (prefered_lft == 0)
1919                 ifa_flags |= IFA_F_DEPRECATED;
1920         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1921                  (prefered_lft != INFINITY_LIFE_TIME))
1922                 prefered_lft = 0x7FFFFFFF/HZ;
1923
1924         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1925
1926         if (!IS_ERR(ifp)) {
1927                 spin_lock_bh(&ifp->lock);
1928                 ifp->valid_lft = valid_lft;
1929                 ifp->prefered_lft = prefered_lft;
1930                 ifp->tstamp = jiffies;
1931                 spin_unlock_bh(&ifp->lock);
1932
1933                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1934                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1935                 /*
1936                  * Note that section 3.1 of RFC 4429 indicates
1937                  * that the Optimistic flag should not be set for
1938                  * manually configured addresses
1939                  */
1940                 addrconf_dad_start(ifp, 0);
1941                 in6_ifa_put(ifp);
1942                 addrconf_verify(0);
1943                 return 0;
1944         }
1945
1946         return PTR_ERR(ifp);
1947 }
1948
1949 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1950 {
1951         struct inet6_ifaddr *ifp;
1952         struct inet6_dev *idev;
1953         struct net_device *dev;
1954
1955         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1956                 return -ENODEV;
1957
1958         if ((idev = __in6_dev_get(dev)) == NULL)
1959                 return -ENXIO;
1960
1961         read_lock_bh(&idev->lock);
1962         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1963                 if (ifp->prefix_len == plen &&
1964                     ipv6_addr_equal(pfx, &ifp->addr)) {
1965                         in6_ifa_hold(ifp);
1966                         read_unlock_bh(&idev->lock);
1967
1968                         ipv6_del_addr(ifp);
1969
1970                         /* If the last address is deleted administratively,
1971                            disable IPv6 on this interface.
1972                          */
1973                         if (idev->addr_list == NULL)
1974                                 addrconf_ifdown(idev->dev, 1);
1975                         return 0;
1976                 }
1977         }
1978         read_unlock_bh(&idev->lock);
1979         return -EADDRNOTAVAIL;
1980 }
1981
1982
1983 int addrconf_add_ifaddr(void __user *arg)
1984 {
1985         struct in6_ifreq ireq;
1986         int err;
1987
1988         if (!capable(CAP_NET_ADMIN))
1989                 return -EPERM;
1990
1991         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1992                 return -EFAULT;
1993
1994         rtnl_lock();
1995         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1996                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1997         rtnl_unlock();
1998         return err;
1999 }
2000
2001 int addrconf_del_ifaddr(void __user *arg)
2002 {
2003         struct in6_ifreq ireq;
2004         int err;
2005
2006         if (!capable(CAP_NET_ADMIN))
2007                 return -EPERM;
2008
2009         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2010                 return -EFAULT;
2011
2012         rtnl_lock();
2013         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2014         rtnl_unlock();
2015         return err;
2016 }
2017
2018 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2019 static void sit_add_v4_addrs(struct inet6_dev *idev)
2020 {
2021         struct inet6_ifaddr * ifp;
2022         struct in6_addr addr;
2023         struct net_device *dev;
2024         int scope;
2025
2026         ASSERT_RTNL();
2027
2028         memset(&addr, 0, sizeof(struct in6_addr));
2029         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2030
2031         if (idev->dev->flags&IFF_POINTOPOINT) {
2032                 addr.s6_addr32[0] = htonl(0xfe800000);
2033                 scope = IFA_LINK;
2034         } else {
2035                 scope = IPV6_ADDR_COMPATv4;
2036         }
2037
2038         if (addr.s6_addr32[3]) {
2039                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2040                 if (!IS_ERR(ifp)) {
2041                         spin_lock_bh(&ifp->lock);
2042                         ifp->flags &= ~IFA_F_TENTATIVE;
2043                         spin_unlock_bh(&ifp->lock);
2044                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2045                         in6_ifa_put(ifp);
2046                 }
2047                 return;
2048         }
2049
2050         for_each_netdev(&init_net, dev) {
2051                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2052                 if (in_dev && (dev->flags & IFF_UP)) {
2053                         struct in_ifaddr * ifa;
2054
2055                         int flag = scope;
2056
2057                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2058                                 int plen;
2059
2060                                 addr.s6_addr32[3] = ifa->ifa_local;
2061
2062                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2063                                         continue;
2064                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2065                                         if (idev->dev->flags&IFF_POINTOPOINT)
2066                                                 continue;
2067                                         flag |= IFA_HOST;
2068                                 }
2069                                 if (idev->dev->flags&IFF_POINTOPOINT)
2070                                         plen = 64;
2071                                 else
2072                                         plen = 96;
2073
2074                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2075                                                     IFA_F_PERMANENT);
2076                                 if (!IS_ERR(ifp)) {
2077                                         spin_lock_bh(&ifp->lock);
2078                                         ifp->flags &= ~IFA_F_TENTATIVE;
2079                                         spin_unlock_bh(&ifp->lock);
2080                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2081                                         in6_ifa_put(ifp);
2082                                 }
2083                         }
2084                 }
2085         }
2086 }
2087 #endif
2088
2089 static void init_loopback(struct net_device *dev)
2090 {
2091         struct inet6_dev  *idev;
2092         struct inet6_ifaddr * ifp;
2093
2094         /* ::1 */
2095
2096         ASSERT_RTNL();
2097
2098         if ((idev = ipv6_find_idev(dev)) == NULL) {
2099                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2100                 return;
2101         }
2102
2103         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2104         if (!IS_ERR(ifp)) {
2105                 spin_lock_bh(&ifp->lock);
2106                 ifp->flags &= ~IFA_F_TENTATIVE;
2107                 spin_unlock_bh(&ifp->lock);
2108                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2109                 in6_ifa_put(ifp);
2110         }
2111 }
2112
2113 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2114 {
2115         struct inet6_ifaddr * ifp;
2116         u32 addr_flags = IFA_F_PERMANENT;
2117
2118 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2119         if (idev->cnf.optimistic_dad &&
2120             !ipv6_devconf.forwarding)
2121                 addr_flags |= IFA_F_OPTIMISTIC;
2122 #endif
2123
2124
2125         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2126         if (!IS_ERR(ifp)) {
2127                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2128                 addrconf_dad_start(ifp, 0);
2129                 in6_ifa_put(ifp);
2130         }
2131 }
2132
2133 static void addrconf_dev_config(struct net_device *dev)
2134 {
2135         struct in6_addr addr;
2136         struct inet6_dev    * idev;
2137
2138         ASSERT_RTNL();
2139
2140         if ((dev->type != ARPHRD_ETHER) &&
2141             (dev->type != ARPHRD_FDDI) &&
2142             (dev->type != ARPHRD_IEEE802_TR) &&
2143             (dev->type != ARPHRD_ARCNET) &&
2144             (dev->type != ARPHRD_INFINIBAND)) {
2145                 /* Alas, we support only Ethernet autoconfiguration. */
2146                 return;
2147         }
2148
2149         idev = addrconf_add_dev(dev);
2150         if (idev == NULL)
2151                 return;
2152
2153         memset(&addr, 0, sizeof(struct in6_addr));
2154         addr.s6_addr32[0] = htonl(0xFE800000);
2155
2156         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2157                 addrconf_add_linklocal(idev, &addr);
2158 }
2159
2160 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2161 static void addrconf_sit_config(struct net_device *dev)
2162 {
2163         struct inet6_dev *idev;
2164
2165         ASSERT_RTNL();
2166
2167         /*
2168          * Configure the tunnel with one of our IPv4
2169          * addresses... we should configure all of
2170          * our v4 addrs in the tunnel
2171          */
2172
2173         if ((idev = ipv6_find_idev(dev)) == NULL) {
2174                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2175                 return;
2176         }
2177
2178         sit_add_v4_addrs(idev);
2179
2180         if (dev->flags&IFF_POINTOPOINT) {
2181                 addrconf_add_mroute(dev);
2182                 addrconf_add_lroute(dev);
2183         } else
2184                 sit_route_add(dev);
2185 }
2186 #endif
2187
2188 static inline int
2189 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2190 {
2191         struct in6_addr lladdr;
2192
2193         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2194                 addrconf_add_linklocal(idev, &lladdr);
2195                 return 0;
2196         }
2197         return -1;
2198 }
2199
2200 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2201 {
2202         struct net_device *link_dev;
2203
2204         /* first try to inherit the link-local address from the link device */
2205         if (idev->dev->iflink &&
2206             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2207                 if (!ipv6_inherit_linklocal(idev, link_dev))
2208                         return;
2209         }
2210         /* then try to inherit it from any device */
2211         for_each_netdev(&init_net, link_dev) {
2212                 if (!ipv6_inherit_linklocal(idev, link_dev))
2213                         return;
2214         }
2215         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2216 }
2217
2218 /*
2219  * Autoconfigure tunnel with a link-local address so routing protocols,
2220  * DHCPv6, MLD etc. can be run over the virtual link
2221  */
2222
2223 static void addrconf_ip6_tnl_config(struct net_device *dev)
2224 {
2225         struct inet6_dev *idev;
2226
2227         ASSERT_RTNL();
2228
2229         if ((idev = addrconf_add_dev(dev)) == NULL) {
2230                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2231                 return;
2232         }
2233         ip6_tnl_add_linklocal(idev);
2234 }
2235
2236 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2237                            void * data)
2238 {
2239         struct net_device *dev = (struct net_device *) data;
2240         struct inet6_dev *idev = __in6_dev_get(dev);
2241         int run_pending = 0;
2242         int err;
2243
2244         if (dev->nd_net != &init_net)
2245                 return NOTIFY_DONE;
2246
2247         switch(event) {
2248         case NETDEV_REGISTER:
2249                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2250                         idev = ipv6_add_dev(dev);
2251                         if (!idev)
2252                                 return notifier_from_errno(-ENOMEM);
2253                 }
2254                 break;
2255         case NETDEV_UP:
2256         case NETDEV_CHANGE:
2257                 if (dev->flags & IFF_SLAVE)
2258                         break;
2259
2260                 if (event == NETDEV_UP) {
2261                         if (!addrconf_qdisc_ok(dev)) {
2262                                 /* device is not ready yet. */
2263                                 printk(KERN_INFO
2264                                         "ADDRCONF(NETDEV_UP): %s: "
2265                                         "link is not ready\n",
2266                                         dev->name);
2267                                 break;
2268                         }
2269
2270                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2271                                 idev = ipv6_add_dev(dev);
2272
2273                         if (idev)
2274                                 idev->if_flags |= IF_READY;
2275                 } else {
2276                         if (!addrconf_qdisc_ok(dev)) {
2277                                 /* device is still not ready. */
2278                                 break;
2279                         }
2280
2281                         if (idev) {
2282                                 if (idev->if_flags & IF_READY) {
2283                                         /* device is already configured. */
2284                                         break;
2285                                 }
2286                                 idev->if_flags |= IF_READY;
2287                         }
2288
2289                         printk(KERN_INFO
2290                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2291                                         "link becomes ready\n",
2292                                         dev->name);
2293
2294                         run_pending = 1;
2295                 }
2296
2297                 switch(dev->type) {
2298 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2299                 case ARPHRD_SIT:
2300                         addrconf_sit_config(dev);
2301                         break;
2302 #endif
2303                 case ARPHRD_TUNNEL6:
2304                         addrconf_ip6_tnl_config(dev);
2305                         break;
2306                 case ARPHRD_LOOPBACK:
2307                         init_loopback(dev);
2308                         break;
2309
2310                 default:
2311                         addrconf_dev_config(dev);
2312                         break;
2313                 }
2314                 if (idev) {
2315                         if (run_pending)
2316                                 addrconf_dad_run(idev);
2317
2318                         /* If the MTU changed during the interface down, when the
2319                            interface up, the changed MTU must be reflected in the
2320                            idev as well as routers.
2321                          */
2322                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2323                                 rt6_mtu_change(dev, dev->mtu);
2324                                 idev->cnf.mtu6 = dev->mtu;
2325                         }
2326                         idev->tstamp = jiffies;
2327                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2328                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2329                            stop IPv6 on this interface.
2330                          */
2331                         if (dev->mtu < IPV6_MIN_MTU)
2332                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2333                 }
2334                 break;
2335
2336         case NETDEV_CHANGEMTU:
2337                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2338                         rt6_mtu_change(dev, dev->mtu);
2339                         idev->cnf.mtu6 = dev->mtu;
2340                         break;
2341                 }
2342
2343                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2344                         idev = ipv6_add_dev(dev);
2345                         if (idev)
2346                                 break;
2347                 }
2348
2349                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2350
2351         case NETDEV_DOWN:
2352         case NETDEV_UNREGISTER:
2353                 /*
2354                  *      Remove all addresses from this interface.
2355                  */
2356                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2357                 break;
2358
2359         case NETDEV_CHANGENAME:
2360                 if (idev) {
2361                         snmp6_unregister_dev(idev);
2362 #ifdef CONFIG_SYSCTL
2363                         addrconf_sysctl_unregister(&idev->cnf);
2364                         neigh_sysctl_unregister(idev->nd_parms);
2365                         neigh_sysctl_register(dev, idev->nd_parms,
2366                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2367                                               &ndisc_ifinfo_sysctl_change,
2368                                               NULL);
2369                         addrconf_sysctl_register(idev, &idev->cnf);
2370 #endif
2371                         err = snmp6_register_dev(idev);
2372                         if (err)
2373                                 return notifier_from_errno(err);
2374                 }
2375                 break;
2376         }
2377
2378         return NOTIFY_OK;
2379 }
2380
2381 /*
2382  *      addrconf module should be notified of a device going up
2383  */
2384 static struct notifier_block ipv6_dev_notf = {
2385         .notifier_call = addrconf_notify,
2386         .priority = 0
2387 };
2388
2389 static int addrconf_ifdown(struct net_device *dev, int how)
2390 {
2391         struct inet6_dev *idev;
2392         struct inet6_ifaddr *ifa, **bifa;
2393         int i;
2394
2395         ASSERT_RTNL();
2396
2397         if (dev == init_net.loopback_dev && how == 1)
2398                 how = 0;
2399
2400         rt6_ifdown(dev);
2401         neigh_ifdown(&nd_tbl, dev);
2402
2403         idev = __in6_dev_get(dev);
2404         if (idev == NULL)
2405                 return -ENODEV;
2406
2407         /* Step 1: remove reference to ipv6 device from parent device.
2408                    Do not dev_put!
2409          */
2410         if (how == 1) {
2411                 idev->dead = 1;
2412
2413                 /* protected by rtnl_lock */
2414                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2415
2416                 /* Step 1.5: remove snmp6 entry */
2417                 snmp6_unregister_dev(idev);
2418
2419         }
2420
2421         /* Step 2: clear hash table */
2422         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2423                 bifa = &inet6_addr_lst[i];
2424
2425                 write_lock_bh(&addrconf_hash_lock);
2426                 while ((ifa = *bifa) != NULL) {
2427                         if (ifa->idev == idev) {
2428                                 *bifa = ifa->lst_next;
2429                                 ifa->lst_next = NULL;
2430                                 addrconf_del_timer(ifa);
2431                                 in6_ifa_put(ifa);
2432                                 continue;
2433                         }
2434                         bifa = &ifa->lst_next;
2435                 }
2436                 write_unlock_bh(&addrconf_hash_lock);
2437         }
2438
2439         write_lock_bh(&idev->lock);
2440
2441         /* Step 3: clear flags for stateless addrconf */
2442         if (how != 1)
2443                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2444
2445         /* Step 4: clear address list */
2446 #ifdef CONFIG_IPV6_PRIVACY
2447         if (how == 1 && del_timer(&idev->regen_timer))
2448                 in6_dev_put(idev);
2449
2450         /* clear tempaddr list */
2451         while ((ifa = idev->tempaddr_list) != NULL) {
2452                 idev->tempaddr_list = ifa->tmp_next;
2453                 ifa->tmp_next = NULL;
2454                 ifa->dead = 1;
2455                 write_unlock_bh(&idev->lock);
2456                 spin_lock_bh(&ifa->lock);
2457
2458                 if (ifa->ifpub) {
2459                         in6_ifa_put(ifa->ifpub);
2460                         ifa->ifpub = NULL;
2461                 }
2462                 spin_unlock_bh(&ifa->lock);
2463                 in6_ifa_put(ifa);
2464                 write_lock_bh(&idev->lock);
2465         }
2466 #endif
2467         while ((ifa = idev->addr_list) != NULL) {
2468                 idev->addr_list = ifa->if_next;
2469                 ifa->if_next = NULL;
2470                 ifa->dead = 1;
2471                 addrconf_del_timer(ifa);
2472                 write_unlock_bh(&idev->lock);
2473
2474                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2475                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2476                 in6_ifa_put(ifa);
2477
2478                 write_lock_bh(&idev->lock);
2479         }
2480         write_unlock_bh(&idev->lock);
2481
2482         /* Step 5: Discard multicast list */
2483
2484         if (how == 1)
2485                 ipv6_mc_destroy_dev(idev);
2486         else
2487                 ipv6_mc_down(idev);
2488
2489         idev->tstamp = jiffies;
2490
2491         /* Shot the device (if unregistered) */
2492
2493         if (how == 1) {
2494 #ifdef CONFIG_SYSCTL
2495                 addrconf_sysctl_unregister(&idev->cnf);
2496                 neigh_sysctl_unregister(idev->nd_parms);
2497 #endif
2498                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2499                 neigh_ifdown(&nd_tbl, dev);
2500                 in6_dev_put(idev);
2501         }
2502         return 0;
2503 }
2504
2505 static void addrconf_rs_timer(unsigned long data)
2506 {
2507         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2508
2509         if (ifp->idev->cnf.forwarding)
2510                 goto out;
2511
2512         if (ifp->idev->if_flags & IF_RA_RCVD) {
2513                 /*
2514                  *      Announcement received after solicitation
2515                  *      was sent
2516                  */
2517                 goto out;
2518         }
2519
2520         spin_lock(&ifp->lock);
2521         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2522                 struct in6_addr all_routers;
2523
2524                 /* The wait after the last probe can be shorter */
2525                 addrconf_mod_timer(ifp, AC_RS,
2526                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2527                                    ifp->idev->cnf.rtr_solicit_delay :
2528                                    ifp->idev->cnf.rtr_solicit_interval);
2529                 spin_unlock(&ifp->lock);
2530
2531                 ipv6_addr_all_routers(&all_routers);
2532
2533                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2534         } else {
2535                 spin_unlock(&ifp->lock);
2536                 /*
2537                  * Note: we do not support deprecated "all on-link"
2538                  * assumption any longer.
2539                  */
2540                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2541                        ifp->idev->dev->name);
2542         }
2543
2544 out:
2545         in6_ifa_put(ifp);
2546 }
2547
2548 /*
2549  *      Duplicate Address Detection
2550  */
2551 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2552 {
2553         unsigned long rand_num;
2554         struct inet6_dev *idev = ifp->idev;
2555
2556         if (ifp->flags & IFA_F_OPTIMISTIC)
2557                 rand_num = 0;
2558         else
2559                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2560
2561         ifp->probes = idev->cnf.dad_transmits;
2562         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2563 }
2564
2565 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2566 {
2567         struct inet6_dev *idev = ifp->idev;
2568         struct net_device *dev = idev->dev;
2569
2570         addrconf_join_solict(dev, &ifp->addr);
2571
2572         net_srandom(ifp->addr.s6_addr32[3]);
2573
2574         read_lock_bh(&idev->lock);
2575         if (ifp->dead)
2576                 goto out;
2577         spin_lock_bh(&ifp->lock);
2578
2579         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2580             !(ifp->flags&IFA_F_TENTATIVE) ||
2581             ifp->flags & IFA_F_NODAD) {
2582                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2583                 spin_unlock_bh(&ifp->lock);
2584                 read_unlock_bh(&idev->lock);
2585
2586                 addrconf_dad_completed(ifp);
2587                 return;
2588         }
2589
2590         if (!(idev->if_flags & IF_READY)) {
2591                 spin_unlock_bh(&ifp->lock);
2592                 read_unlock_bh(&idev->lock);
2593                 /*
2594                  * If the defice is not ready:
2595                  * - keep it tentative if it is a permanent address.
2596                  * - otherwise, kill it.
2597                  */
2598                 in6_ifa_hold(ifp);
2599                 addrconf_dad_stop(ifp);
2600                 return;
2601         }
2602
2603         /*
2604          * Optimistic nodes can start receiving
2605          * Frames right away
2606          */
2607         if(ifp->flags & IFA_F_OPTIMISTIC)
2608                 ip6_ins_rt(ifp->rt);
2609
2610         addrconf_dad_kick(ifp);
2611         spin_unlock_bh(&ifp->lock);
2612 out:
2613         read_unlock_bh(&idev->lock);
2614 }
2615
2616 static void addrconf_dad_timer(unsigned long data)
2617 {
2618         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2619         struct inet6_dev *idev = ifp->idev;
2620         struct in6_addr unspec;
2621         struct in6_addr mcaddr;
2622
2623         read_lock_bh(&idev->lock);
2624         if (idev->dead) {
2625                 read_unlock_bh(&idev->lock);
2626                 goto out;
2627         }
2628         spin_lock_bh(&ifp->lock);
2629         if (ifp->probes == 0) {
2630                 /*
2631                  * DAD was successful
2632                  */
2633
2634                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2635                 spin_unlock_bh(&ifp->lock);
2636                 read_unlock_bh(&idev->lock);
2637
2638                 addrconf_dad_completed(ifp);
2639
2640                 goto out;
2641         }
2642
2643         ifp->probes--;
2644         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2645         spin_unlock_bh(&ifp->lock);
2646         read_unlock_bh(&idev->lock);
2647
2648         /* send a neighbour solicitation for our addr */
2649         memset(&unspec, 0, sizeof(unspec));
2650         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2651         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2652 out:
2653         in6_ifa_put(ifp);
2654 }
2655
2656 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2657 {
2658         struct net_device *     dev = ifp->idev->dev;
2659
2660         /*
2661          *      Configure the address for reception. Now it is valid.
2662          */
2663
2664         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2665
2666         /* If added prefix is link local and forwarding is off,
2667            start sending router solicitations.
2668          */
2669
2670         if (ifp->idev->cnf.forwarding == 0 &&
2671             ifp->idev->cnf.rtr_solicits > 0 &&
2672             (dev->flags&IFF_LOOPBACK) == 0 &&
2673             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2674                 struct in6_addr all_routers;
2675
2676                 ipv6_addr_all_routers(&all_routers);
2677
2678                 /*
2679                  *      If a host as already performed a random delay
2680                  *      [...] as part of DAD [...] there is no need
2681                  *      to delay again before sending the first RS
2682                  */
2683                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2684
2685                 spin_lock_bh(&ifp->lock);
2686                 ifp->probes = 1;
2687                 ifp->idev->if_flags |= IF_RS_SENT;
2688                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2689                 spin_unlock_bh(&ifp->lock);
2690         }
2691 }
2692
2693 static void addrconf_dad_run(struct inet6_dev *idev) {
2694         struct inet6_ifaddr *ifp;
2695
2696         read_lock_bh(&idev->lock);
2697         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2698                 spin_lock_bh(&ifp->lock);
2699                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2700                         spin_unlock_bh(&ifp->lock);
2701                         continue;
2702                 }
2703                 spin_unlock_bh(&ifp->lock);
2704                 addrconf_dad_kick(ifp);
2705         }
2706         read_unlock_bh(&idev->lock);
2707 }
2708
2709 #ifdef CONFIG_PROC_FS
2710 struct if6_iter_state {
2711         int bucket;
2712 };
2713
2714 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2715 {
2716         struct inet6_ifaddr *ifa = NULL;
2717         struct if6_iter_state *state = seq->private;
2718
2719         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2720                 ifa = inet6_addr_lst[state->bucket];
2721                 if (ifa)
2722                         break;
2723         }
2724         return ifa;
2725 }
2726
2727 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2728 {
2729         struct if6_iter_state *state = seq->private;
2730
2731         ifa = ifa->lst_next;
2732 try_again:
2733         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2734                 ifa = inet6_addr_lst[state->bucket];
2735                 goto try_again;
2736         }
2737         return ifa;
2738 }
2739
2740 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2741 {
2742         struct inet6_ifaddr *ifa = if6_get_first(seq);
2743
2744         if (ifa)
2745                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2746                         --pos;
2747         return pos ? NULL : ifa;
2748 }
2749
2750 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2751 {
2752         read_lock_bh(&addrconf_hash_lock);
2753         return if6_get_idx(seq, *pos);
2754 }
2755
2756 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2757 {
2758         struct inet6_ifaddr *ifa;
2759
2760         ifa = if6_get_next(seq, v);
2761         ++*pos;
2762         return ifa;
2763 }
2764
2765 static void if6_seq_stop(struct seq_file *seq, void *v)
2766 {
2767         read_unlock_bh(&addrconf_hash_lock);
2768 }
2769
2770 static int if6_seq_show(struct seq_file *seq, void *v)
2771 {
2772         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2773         seq_printf(seq,
2774                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2775                    NIP6(ifp->addr),
2776                    ifp->idev->dev->ifindex,
2777                    ifp->prefix_len,
2778                    ifp->scope,
2779                    ifp->flags,
2780                    ifp->idev->dev->name);
2781         return 0;
2782 }
2783
2784 static const struct seq_operations if6_seq_ops = {
2785         .start  = if6_seq_start,
2786         .next   = if6_seq_next,
2787         .show   = if6_seq_show,
2788         .stop   = if6_seq_stop,
2789 };
2790
2791 static int if6_seq_open(struct inode *inode, struct file *file)
2792 {
2793         return seq_open_private(file, &if6_seq_ops,
2794                         sizeof(struct if6_iter_state));
2795 }
2796
2797 static const struct file_operations if6_fops = {
2798         .owner          = THIS_MODULE,
2799         .open           = if6_seq_open,
2800         .read           = seq_read,
2801         .llseek         = seq_lseek,
2802         .release        = seq_release_private,
2803 };
2804
2805 int __init if6_proc_init(void)
2806 {
2807         if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2808                 return -ENOMEM;
2809         return 0;
2810 }
2811
2812 void if6_proc_exit(void)
2813 {
2814         proc_net_remove(&init_net, "if_inet6");
2815 }
2816 #endif  /* CONFIG_PROC_FS */
2817
2818 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2819 /* Check if address is a home address configured on any interface. */
2820 int ipv6_chk_home_addr(struct in6_addr *addr)
2821 {
2822         int ret = 0;
2823         struct inet6_ifaddr * ifp;
2824         u8 hash = ipv6_addr_hash(addr);
2825         read_lock_bh(&addrconf_hash_lock);
2826         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2827                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2828                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2829                         ret = 1;
2830                         break;
2831                 }
2832         }
2833         read_unlock_bh(&addrconf_hash_lock);
2834         return ret;
2835 }
2836 #endif
2837
2838 /*
2839  *      Periodic address status verification
2840  */
2841
2842 static void addrconf_verify(unsigned long foo)
2843 {
2844         struct inet6_ifaddr *ifp;
2845         unsigned long now, next;
2846         int i;
2847
2848         spin_lock_bh(&addrconf_verify_lock);
2849         now = jiffies;
2850         next = now + ADDR_CHECK_FREQUENCY;
2851
2852         del_timer(&addr_chk_timer);
2853
2854         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2855
2856 restart:
2857                 read_lock(&addrconf_hash_lock);
2858                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2859                         unsigned long age;
2860 #ifdef CONFIG_IPV6_PRIVACY
2861                         unsigned long regen_advance;
2862 #endif
2863
2864                         if (ifp->flags & IFA_F_PERMANENT)
2865                                 continue;
2866
2867                         spin_lock(&ifp->lock);
2868                         age = (now - ifp->tstamp) / HZ;
2869
2870 #ifdef CONFIG_IPV6_PRIVACY
2871                         regen_advance = ifp->idev->cnf.regen_max_retry *
2872                                         ifp->idev->cnf.dad_transmits *
2873                                         ifp->idev->nd_parms->retrans_time / HZ;
2874 #endif
2875
2876                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2877                             age >= ifp->valid_lft) {
2878                                 spin_unlock(&ifp->lock);
2879                                 in6_ifa_hold(ifp);
2880                                 read_unlock(&addrconf_hash_lock);
2881                                 ipv6_del_addr(ifp);
2882                                 goto restart;
2883                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2884                                 spin_unlock(&ifp->lock);
2885                                 continue;
2886                         } else if (age >= ifp->prefered_lft) {
2887                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2888                                 int deprecate = 0;
2889
2890                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2891                                         deprecate = 1;
2892                                         ifp->flags |= IFA_F_DEPRECATED;
2893                                 }
2894
2895                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2896                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2897
2898                                 spin_unlock(&ifp->lock);
2899
2900                                 if (deprecate) {
2901                                         in6_ifa_hold(ifp);
2902                                         read_unlock(&addrconf_hash_lock);
2903
2904                                         ipv6_ifa_notify(0, ifp);
2905                                         in6_ifa_put(ifp);
2906                                         goto restart;
2907                                 }
2908 #ifdef CONFIG_IPV6_PRIVACY
2909                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2910                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2911                                 if (age >= ifp->prefered_lft - regen_advance) {
2912                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2913                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2914                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2915                                         if (!ifp->regen_count && ifpub) {
2916                                                 ifp->regen_count++;
2917                                                 in6_ifa_hold(ifp);
2918                                                 in6_ifa_hold(ifpub);
2919                                                 spin_unlock(&ifp->lock);
2920                                                 read_unlock(&addrconf_hash_lock);
2921                                                 spin_lock(&ifpub->lock);
2922                                                 ifpub->regen_count = 0;
2923                                                 spin_unlock(&ifpub->lock);
2924                                                 ipv6_create_tempaddr(ifpub, ifp);
2925                                                 in6_ifa_put(ifpub);
2926                                                 in6_ifa_put(ifp);
2927                                                 goto restart;
2928                                         }
2929                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2930                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2931                                 spin_unlock(&ifp->lock);
2932 #endif
2933                         } else {
2934                                 /* ifp->prefered_lft <= ifp->valid_lft */
2935                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2936                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2937                                 spin_unlock(&ifp->lock);
2938                         }
2939                 }
2940                 read_unlock(&addrconf_hash_lock);
2941         }
2942
2943         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2944         add_timer(&addr_chk_timer);
2945         spin_unlock_bh(&addrconf_verify_lock);
2946 }
2947
2948 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2949 {
2950         struct in6_addr *pfx = NULL;
2951
2952         if (addr)
2953                 pfx = nla_data(addr);
2954
2955         if (local) {
2956                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2957                         pfx = NULL;
2958                 else
2959                         pfx = nla_data(local);
2960         }
2961
2962         return pfx;
2963 }
2964
2965 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2966         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2967         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2968         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2969 };
2970
2971 static int
2972 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2973 {
2974         struct net *net = skb->sk->sk_net;
2975         struct ifaddrmsg *ifm;
2976         struct nlattr *tb[IFA_MAX+1];
2977         struct in6_addr *pfx;
2978         int err;
2979
2980         if (net != &init_net)
2981                 return -EINVAL;
2982
2983         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2984         if (err < 0)
2985                 return err;
2986
2987         ifm = nlmsg_data(nlh);
2988         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2989         if (pfx == NULL)
2990                 return -EINVAL;
2991
2992         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2993 }
2994
2995 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2996                              u32 prefered_lft, u32 valid_lft)
2997 {
2998         u32 flags = RTF_EXPIRES;
2999
3000         if (!valid_lft || (prefered_lft > valid_lft))
3001                 return -EINVAL;
3002
3003         if (valid_lft == INFINITY_LIFE_TIME) {
3004                 ifa_flags |= IFA_F_PERMANENT;
3005                 flags = 0;
3006         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3007                 valid_lft = 0x7FFFFFFF/HZ;
3008
3009         if (prefered_lft == 0)
3010                 ifa_flags |= IFA_F_DEPRECATED;
3011         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3012                  (prefered_lft != INFINITY_LIFE_TIME))
3013                 prefered_lft = 0x7FFFFFFF/HZ;
3014
3015         spin_lock_bh(&ifp->lock);
3016         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3017         ifp->tstamp = jiffies;
3018         ifp->valid_lft = valid_lft;
3019         ifp->prefered_lft = prefered_lft;
3020
3021         spin_unlock_bh(&ifp->lock);
3022         if (!(ifp->flags&IFA_F_TENTATIVE))
3023                 ipv6_ifa_notify(0, ifp);
3024
3025         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3026                               jiffies_to_clock_t(valid_lft * HZ), flags);
3027         addrconf_verify(0);
3028
3029         return 0;
3030 }
3031
3032 static int
3033 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3034 {
3035         struct net *net = skb->sk->sk_net;
3036         struct ifaddrmsg *ifm;
3037         struct nlattr *tb[IFA_MAX+1];
3038         struct in6_addr *pfx;
3039         struct inet6_ifaddr *ifa;
3040         struct net_device *dev;
3041         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3042         u8 ifa_flags;
3043         int err;
3044
3045         if (net != &init_net)
3046                 return -EINVAL;
3047
3048         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3049         if (err < 0)
3050                 return err;
3051
3052         ifm = nlmsg_data(nlh);
3053         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3054         if (pfx == NULL)
3055                 return -EINVAL;
3056
3057         if (tb[IFA_CACHEINFO]) {
3058                 struct ifa_cacheinfo *ci;
3059
3060                 ci = nla_data(tb[IFA_CACHEINFO]);
3061                 valid_lft = ci->ifa_valid;
3062                 preferred_lft = ci->ifa_prefered;
3063         } else {
3064                 preferred_lft = INFINITY_LIFE_TIME;
3065                 valid_lft = INFINITY_LIFE_TIME;
3066         }
3067
3068         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3069         if (dev == NULL)
3070                 return -ENODEV;
3071
3072         /* We ignore other flags so far. */
3073         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3074
3075         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3076         if (ifa == NULL) {
3077                 /*
3078                  * It would be best to check for !NLM_F_CREATE here but
3079                  * userspace alreay relies on not having to provide this.
3080                  */
3081                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3082                                       ifa_flags, preferred_lft, valid_lft);
3083         }
3084
3085         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3086             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3087                 err = -EEXIST;
3088         else
3089                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3090
3091         in6_ifa_put(ifa);
3092
3093         return err;
3094 }
3095
3096 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3097                           u8 scope, int ifindex)
3098 {
3099         struct ifaddrmsg *ifm;
3100
3101         ifm = nlmsg_data(nlh);
3102         ifm->ifa_family = AF_INET6;
3103         ifm->ifa_prefixlen = prefixlen;
3104         ifm->ifa_flags = flags;
3105         ifm->ifa_scope = scope;
3106         ifm->ifa_index = ifindex;
3107 }
3108
3109 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3110                          unsigned long tstamp, u32 preferred, u32 valid)
3111 {
3112         struct ifa_cacheinfo ci;
3113
3114         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3115                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3116         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3117                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3118         ci.ifa_prefered = preferred;
3119         ci.ifa_valid = valid;
3120
3121         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3122 }
3123
3124 static inline int rt_scope(int ifa_scope)
3125 {
3126         if (ifa_scope & IFA_HOST)
3127                 return RT_SCOPE_HOST;
3128         else if (ifa_scope & IFA_LINK)
3129                 return RT_SCOPE_LINK;
3130         else if (ifa_scope & IFA_SITE)
3131                 return RT_SCOPE_SITE;
3132         else
3133                 return RT_SCOPE_UNIVERSE;
3134 }
3135
3136 static inline int inet6_ifaddr_msgsize(void)
3137 {
3138         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3139                + nla_total_size(16) /* IFA_ADDRESS */
3140                + nla_total_size(sizeof(struct ifa_cacheinfo));
3141 }
3142
3143 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3144                              u32 pid, u32 seq, int event, unsigned int flags)
3145 {
3146         struct nlmsghdr  *nlh;
3147         u32 preferred, valid;
3148
3149         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3150         if (nlh == NULL)
3151                 return -EMSGSIZE;
3152
3153         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3154                       ifa->idev->dev->ifindex);
3155
3156         if (!(ifa->flags&IFA_F_PERMANENT)) {
3157                 preferred = ifa->prefered_lft;
3158                 valid = ifa->valid_lft;
3159                 if (preferred != INFINITY_LIFE_TIME) {
3160                         long tval = (jiffies - ifa->tstamp)/HZ;
3161                         preferred -= tval;
3162                         if (valid != INFINITY_LIFE_TIME)
3163                                 valid -= tval;
3164                 }
3165         } else {
3166                 preferred = INFINITY_LIFE_TIME;
3167                 valid = INFINITY_LIFE_TIME;
3168         }
3169
3170         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3171             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3172                 nlmsg_cancel(skb, nlh);
3173                 return -EMSGSIZE;
3174         }
3175
3176         return nlmsg_end(skb, nlh);
3177 }
3178
3179 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3180                                 u32 pid, u32 seq, int event, u16 flags)
3181 {
3182         struct nlmsghdr  *nlh;
3183         u8 scope = RT_SCOPE_UNIVERSE;
3184         int ifindex = ifmca->idev->dev->ifindex;
3185
3186         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3187                 scope = RT_SCOPE_SITE;
3188
3189         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3190         if (nlh == NULL)
3191                 return -EMSGSIZE;
3192
3193         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3194         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3195             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3196                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3197                 nlmsg_cancel(skb, nlh);
3198                 return -EMSGSIZE;
3199         }
3200
3201         return nlmsg_end(skb, nlh);
3202 }
3203
3204 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3205                                 u32 pid, u32 seq, int event, unsigned int flags)
3206 {
3207         struct nlmsghdr  *nlh;
3208         u8 scope = RT_SCOPE_UNIVERSE;
3209         int ifindex = ifaca->aca_idev->dev->ifindex;
3210
3211         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3212                 scope = RT_SCOPE_SITE;
3213
3214         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3215         if (nlh == NULL)
3216                 return -EMSGSIZE;
3217
3218         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3219         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3220             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3221                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3222                 nlmsg_cancel(skb, nlh);
3223                 return -EMSGSIZE;
3224         }
3225
3226         return nlmsg_end(skb, nlh);
3227 }
3228
3229 enum addr_type_t
3230 {
3231         UNICAST_ADDR,
3232         MULTICAST_ADDR,
3233         ANYCAST_ADDR,
3234 };
3235
3236 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3237                            enum addr_type_t type)
3238 {
3239         int idx, ip_idx;
3240         int s_idx, s_ip_idx;
3241         int err = 1;
3242         struct net_device *dev;
3243         struct inet6_dev *idev = NULL;
3244         struct inet6_ifaddr *ifa;
3245         struct ifmcaddr6 *ifmca;
3246         struct ifacaddr6 *ifaca;
3247
3248         s_idx = cb->args[0];
3249         s_ip_idx = ip_idx = cb->args[1];
3250
3251         idx = 0;
3252         for_each_netdev(&init_net, dev) {
3253                 if (idx < s_idx)
3254                         goto cont;
3255                 if (idx > s_idx)
3256                         s_ip_idx = 0;
3257                 ip_idx = 0;
3258                 if ((idev = in6_dev_get(dev)) == NULL)
3259                         goto cont;
3260                 read_lock_bh(&idev->lock);
3261                 switch (type) {
3262                 case UNICAST_ADDR:
3263                         /* unicast address incl. temp addr */
3264                         for (ifa = idev->addr_list; ifa;
3265                              ifa = ifa->if_next, ip_idx++) {
3266                                 if (ip_idx < s_ip_idx)
3267                                         continue;
3268                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3269                                     NETLINK_CB(cb->skb).pid,
3270                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3271                                     NLM_F_MULTI)) <= 0)
3272                                         goto done;
3273                         }
3274                         break;
3275                 case MULTICAST_ADDR:
3276                         /* multicast address */
3277                         for (ifmca = idev->mc_list; ifmca;
3278                              ifmca = ifmca->next, ip_idx++) {
3279                                 if (ip_idx < s_ip_idx)
3280                                         continue;
3281                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3282                                     NETLINK_CB(cb->skb).pid,
3283                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3284                                     NLM_F_MULTI)) <= 0)
3285                                         goto done;
3286                         }
3287                         break;
3288                 case ANYCAST_ADDR:
3289                         /* anycast address */
3290                         for (ifaca = idev->ac_list; ifaca;
3291                              ifaca = ifaca->aca_next, ip_idx++) {
3292                                 if (ip_idx < s_ip_idx)
3293                                         continue;
3294                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3295                                     NETLINK_CB(cb->skb).pid,
3296                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3297                                     NLM_F_MULTI)) <= 0)
3298                                         goto done;
3299                         }
3300                         break;
3301                 default:
3302                         break;
3303                 }
3304                 read_unlock_bh(&idev->lock);
3305                 in6_dev_put(idev);
3306 cont:
3307                 idx++;
3308         }
3309 done:
3310         if (err <= 0) {
3311                 read_unlock_bh(&idev->lock);
3312                 in6_dev_put(idev);
3313         }
3314         cb->args[0] = idx;
3315         cb->args[1] = ip_idx;
3316         return skb->len;
3317 }
3318
3319 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3320 {
3321         struct net *net = skb->sk->sk_net;
3322         enum addr_type_t type = UNICAST_ADDR;
3323
3324         if (net != &init_net)
3325                 return 0;
3326
3327         return inet6_dump_addr(skb, cb, type);
3328 }
3329
3330 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3331 {
3332         struct net *net = skb->sk->sk_net;
3333         enum addr_type_t type = MULTICAST_ADDR;
3334
3335         if (net != &init_net)
3336                 return 0;
3337
3338         return inet6_dump_addr(skb, cb, type);
3339 }
3340
3341
3342 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3343 {
3344         struct net *net = skb->sk->sk_net;
3345         enum addr_type_t type = ANYCAST_ADDR;
3346
3347         if (net != &init_net)
3348                 return 0;
3349
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 net *net = in_skb->sk->sk_net;
3357         struct ifaddrmsg *ifm;
3358         struct nlattr *tb[IFA_MAX+1];
3359         struct in6_addr *addr = NULL;
3360         struct net_device *dev = NULL;
3361         struct inet6_ifaddr *ifa;
3362         struct sk_buff *skb;
3363         int err;
3364
3365         if (net != &init_net)
3366                 return -EINVAL;
3367
3368         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3369         if (err < 0)
3370                 goto errout;
3371
3372         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3373         if (addr == NULL) {
3374                 err = -EINVAL;
3375                 goto errout;
3376         }
3377
3378         ifm = nlmsg_data(nlh);
3379         if (ifm->ifa_index)
3380                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3381
3382         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3383                 err = -EADDRNOTAVAIL;
3384                 goto errout;
3385         }
3386
3387         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3388                 err = -ENOBUFS;
3389                 goto errout_ifa;
3390         }
3391
3392         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3393                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3394         if (err < 0) {
3395                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3396                 WARN_ON(err == -EMSGSIZE);
3397                 kfree_skb(skb);
3398                 goto errout_ifa;
3399         }
3400         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3401 errout_ifa:
3402         in6_ifa_put(ifa);
3403 errout:
3404         return err;
3405 }
3406
3407 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3408 {
3409         struct sk_buff *skb;
3410         int err = -ENOBUFS;
3411
3412         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3413         if (skb == NULL)
3414                 goto errout;
3415
3416         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3417         if (err < 0) {
3418                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3419                 WARN_ON(err == -EMSGSIZE);
3420                 kfree_skb(skb);
3421                 goto errout;
3422         }
3423         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3424 errout:
3425         if (err < 0)
3426                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3427 }
3428
3429 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3430                                 __s32 *array, int bytes)
3431 {
3432         BUG_ON(bytes < (DEVCONF_MAX * 4));
3433
3434         memset(array, 0, bytes);
3435         array[DEVCONF_FORWARDING] = cnf->forwarding;
3436         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3437         array[DEVCONF_MTU6] = cnf->mtu6;
3438         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3439         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3440         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3441         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3442         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3443         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3444         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3445         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3446 #ifdef CONFIG_IPV6_PRIVACY
3447         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3448         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3449         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3450         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3451         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3452 #endif
3453         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3454         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3455         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3456 #ifdef CONFIG_IPV6_ROUTER_PREF
3457         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3458         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3459 #ifdef CONFIG_IPV6_ROUTE_INFO
3460         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3461 #endif
3462 #endif
3463         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3464         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3465 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3466         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3467 #endif
3468 }
3469
3470 static inline size_t inet6_if_nlmsg_size(void)
3471 {
3472         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3473                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3474                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3475                + nla_total_size(4) /* IFLA_MTU */
3476                + nla_total_size(4) /* IFLA_LINK */
3477                + nla_total_size( /* IFLA_PROTINFO */
3478                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3479                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3480                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3481                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3482                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3483                  );
3484 }
3485
3486 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3487                                       int bytes)
3488 {
3489         int i;
3490         int pad = bytes - sizeof(u64) * items;
3491         BUG_ON(pad < 0);
3492
3493         /* Use put_unaligned() because stats may not be aligned for u64. */
3494         put_unaligned(items, &stats[0]);
3495         for (i = 1; i < items; i++)
3496                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3497
3498         memset(&stats[items], 0, pad);
3499 }
3500
3501 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3502                              int bytes)
3503 {
3504         switch(attrtype) {
3505         case IFLA_INET6_STATS:
3506                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3507                 break;
3508         case IFLA_INET6_ICMP6STATS:
3509                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3510                 break;
3511         }
3512 }
3513
3514 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3515                              u32 pid, u32 seq, int event, unsigned int flags)
3516 {
3517         struct net_device *dev = idev->dev;
3518         struct nlattr *nla;
3519         struct ifinfomsg *hdr;
3520         struct nlmsghdr *nlh;
3521         void *protoinfo;
3522         struct ifla_cacheinfo ci;
3523
3524         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3525         if (nlh == NULL)
3526                 return -EMSGSIZE;
3527
3528         hdr = nlmsg_data(nlh);
3529         hdr->ifi_family = AF_INET6;
3530         hdr->__ifi_pad = 0;
3531         hdr->ifi_type = dev->type;
3532         hdr->ifi_index = dev->ifindex;
3533         hdr->ifi_flags = dev_get_flags(dev);
3534         hdr->ifi_change = 0;
3535
3536         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3537
3538         if (dev->addr_len)
3539                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3540
3541         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3542         if (dev->ifindex != dev->iflink)
3543                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3544
3545         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3546         if (protoinfo == NULL)
3547                 goto nla_put_failure;
3548
3549         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3550
3551         ci.max_reasm_len = IPV6_MAXPLEN;
3552         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3553                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3554         ci.reachable_time = idev->nd_parms->reachable_time;
3555         ci.retrans_time = idev->nd_parms->retrans_time;
3556         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3557
3558         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3559         if (nla == NULL)
3560                 goto nla_put_failure;
3561         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3562
3563         /* XXX - MC not implemented */
3564
3565         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3566         if (nla == NULL)
3567                 goto nla_put_failure;
3568         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3569
3570         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3571         if (nla == NULL)
3572                 goto nla_put_failure;
3573         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3574
3575         nla_nest_end(skb, protoinfo);
3576         return nlmsg_end(skb, nlh);
3577
3578 nla_put_failure:
3579         nlmsg_cancel(skb, nlh);
3580         return -EMSGSIZE;
3581 }
3582
3583 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3584 {
3585         struct net *net = skb->sk->sk_net;
3586         int idx, err;
3587         int s_idx = cb->args[0];
3588         struct net_device *dev;
3589         struct inet6_dev *idev;
3590
3591         if (net != &init_net)
3592                 return 0;
3593
3594         read_lock(&dev_base_lock);
3595         idx = 0;
3596         for_each_netdev(&init_net, dev) {
3597                 if (idx < s_idx)
3598                         goto cont;
3599                 if ((idev = in6_dev_get(dev)) == NULL)
3600                         goto cont;
3601                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3602                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3603                 in6_dev_put(idev);
3604                 if (err <= 0)
3605                         break;
3606 cont:
3607                 idx++;
3608         }
3609         read_unlock(&dev_base_lock);
3610         cb->args[0] = idx;
3611
3612         return skb->len;
3613 }
3614
3615 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3616 {
3617         struct sk_buff *skb;
3618         int err = -ENOBUFS;
3619
3620         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3621         if (skb == NULL)
3622                 goto errout;
3623
3624         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3625         if (err < 0) {
3626                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3627                 WARN_ON(err == -EMSGSIZE);
3628                 kfree_skb(skb);
3629                 goto errout;
3630         }
3631         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3632 errout:
3633         if (err < 0)
3634                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3635 }
3636
3637 static inline size_t inet6_prefix_nlmsg_size(void)
3638 {
3639         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3640                + nla_total_size(sizeof(struct in6_addr))
3641                + nla_total_size(sizeof(struct prefix_cacheinfo));
3642 }
3643
3644 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3645                              struct prefix_info *pinfo, u32 pid, u32 seq,
3646                              int event, unsigned int flags)
3647 {
3648         struct prefixmsg *pmsg;
3649         struct nlmsghdr *nlh;
3650         struct prefix_cacheinfo ci;
3651
3652         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3653         if (nlh == NULL)
3654                 return -EMSGSIZE;
3655
3656         pmsg = nlmsg_data(nlh);
3657         pmsg->prefix_family = AF_INET6;
3658         pmsg->prefix_pad1 = 0;
3659         pmsg->prefix_pad2 = 0;
3660         pmsg->prefix_ifindex = idev->dev->ifindex;
3661         pmsg->prefix_len = pinfo->prefix_len;
3662         pmsg->prefix_type = pinfo->type;
3663         pmsg->prefix_pad3 = 0;
3664         pmsg->prefix_flags = 0;
3665         if (pinfo->onlink)
3666                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3667         if (pinfo->autoconf)
3668                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3669
3670         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3671
3672         ci.preferred_time = ntohl(pinfo->prefered);
3673         ci.valid_time = ntohl(pinfo->valid);
3674         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3675
3676         return nlmsg_end(skb, nlh);
3677
3678 nla_put_failure:
3679         nlmsg_cancel(skb, nlh);
3680         return -EMSGSIZE;
3681 }
3682
3683 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3684                          struct prefix_info *pinfo)
3685 {
3686         struct sk_buff *skb;
3687         int err = -ENOBUFS;
3688
3689         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3690         if (skb == NULL)
3691                 goto errout;
3692
3693         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3694         if (err < 0) {
3695                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3696                 WARN_ON(err == -EMSGSIZE);
3697                 kfree_skb(skb);
3698                 goto errout;
3699         }
3700         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3701 errout:
3702         if (err < 0)
3703                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3704 }
3705
3706 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3707 {
3708         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3709
3710         switch (event) {
3711         case RTM_NEWADDR:
3712                 /*
3713                  * If the address was optimistic
3714                  * we inserted the route at the start of
3715                  * our DAD process, so we don't need
3716                  * to do it again
3717                  */
3718                 if (!(ifp->rt->rt6i_node))
3719                         ip6_ins_rt(ifp->rt);
3720                 if (ifp->idev->cnf.forwarding)
3721                         addrconf_join_anycast(ifp);
3722                 break;
3723         case RTM_DELADDR:
3724                 if (ifp->idev->cnf.forwarding)
3725                         addrconf_leave_anycast(ifp);
3726                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3727                 dst_hold(&ifp->rt->u.dst);
3728                 if (ip6_del_rt(ifp->rt))
3729                         dst_free(&ifp->rt->u.dst);
3730                 break;
3731         }
3732 }
3733
3734 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3735 {
3736         rcu_read_lock_bh();
3737         if (likely(ifp->idev->dead == 0))
3738                 __ipv6_ifa_notify(event, ifp);
3739         rcu_read_unlock_bh();
3740 }
3741
3742 #ifdef CONFIG_SYSCTL
3743
3744 static
3745 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3746                            void __user *buffer, size_t *lenp, loff_t *ppos)
3747 {
3748         int *valp = ctl->data;
3749         int val = *valp;
3750         int ret;
3751
3752         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3753
3754         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3755                 if (valp != &ipv6_devconf.forwarding) {
3756                         if ((!*valp) ^ (!val)) {
3757                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3758                                 if (idev == NULL)
3759                                         return ret;
3760                                 dev_forward_change(idev);
3761                         }
3762                 } else {
3763                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3764                         addrconf_forward_change();
3765                 }
3766                 if (*valp)
3767                         rt6_purge_dflt_routers();
3768         }
3769
3770         return ret;
3771 }
3772
3773 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3774                                             int __user *name, int nlen,
3775                                             void __user *oldval,
3776                                             size_t __user *oldlenp,
3777                                             void __user *newval, size_t newlen)
3778 {
3779         int *valp = table->data;
3780         int new;
3781
3782         if (!newval || !newlen)
3783                 return 0;
3784         if (newlen != sizeof(int))
3785                 return -EINVAL;
3786         if (get_user(new, (int __user *)newval))
3787                 return -EFAULT;
3788         if (new == *valp)
3789                 return 0;
3790         if (oldval && oldlenp) {
3791                 size_t len;
3792                 if (get_user(len, oldlenp))
3793                         return -EFAULT;
3794                 if (len) {
3795                         if (len > table->maxlen)
3796                                 len = table->maxlen;
3797                         if (copy_to_user(oldval, valp, len))
3798                                 return -EFAULT;
3799                         if (put_user(len, oldlenp))
3800                                 return -EFAULT;
3801                 }
3802         }
3803
3804         if (valp != &ipv6_devconf_dflt.forwarding) {
3805                 if (valp != &ipv6_devconf.forwarding) {
3806                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3807                         int changed;
3808                         if (unlikely(idev == NULL))
3809                                 return -ENODEV;
3810                         changed = (!*valp) ^ (!new);
3811                         *valp = new;
3812                         if (changed)
3813                                 dev_forward_change(idev);
3814                 } else {
3815                         *valp = new;
3816                         addrconf_forward_change();
3817                 }
3818
3819                 if (*valp)
3820                         rt6_purge_dflt_routers();
3821         } else
3822                 *valp = new;
3823
3824         return 1;
3825 }
3826
3827 static struct addrconf_sysctl_table
3828 {
3829         struct ctl_table_header *sysctl_header;
3830         ctl_table addrconf_vars[__NET_IPV6_MAX];
3831         ctl_table addrconf_dev[2];
3832         ctl_table addrconf_conf_dir[2];
3833         ctl_table addrconf_proto_dir[2];
3834         ctl_table addrconf_root_dir[2];
3835 } addrconf_sysctl __read_mostly = {
3836         .sysctl_header = NULL,
3837         .addrconf_vars = {
3838                 {
3839                         .ctl_name       =       NET_IPV6_FORWARDING,
3840                         .procname       =       "forwarding",
3841                         .data           =       &ipv6_devconf.forwarding,
3842                         .maxlen         =       sizeof(int),
3843                         .mode           =       0644,
3844                         .proc_handler   =       &addrconf_sysctl_forward,
3845                         .strategy       =       &addrconf_sysctl_forward_strategy,
3846                 },
3847                 {
3848                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3849                         .procname       =       "hop_limit",
3850                         .data           =       &ipv6_devconf.hop_limit,
3851                         .maxlen         =       sizeof(int),
3852                         .mode           =       0644,
3853                         .proc_handler   =       proc_dointvec,
3854                 },
3855                 {
3856                         .ctl_name       =       NET_IPV6_MTU,
3857                         .procname       =       "mtu",
3858                         .data           =       &ipv6_devconf.mtu6,
3859                         .maxlen         =       sizeof(int),
3860                         .mode           =       0644,
3861                         .proc_handler   =       &proc_dointvec,
3862                 },
3863                 {
3864                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3865                         .procname       =       "accept_ra",
3866                         .data           =       &ipv6_devconf.accept_ra,
3867                         .maxlen         =       sizeof(int),
3868                         .mode           =       0644,
3869                         .proc_handler   =       &proc_dointvec,
3870                 },
3871                 {
3872                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3873                         .procname       =       "accept_redirects",
3874                         .data           =       &ipv6_devconf.accept_redirects,
3875                         .maxlen         =       sizeof(int),
3876                         .mode           =       0644,
3877                         .proc_handler   =       &proc_dointvec,
3878                 },
3879                 {
3880                         .ctl_name       =       NET_IPV6_AUTOCONF,
3881                         .procname       =       "autoconf",
3882                         .data           =       &ipv6_devconf.autoconf,
3883                         .maxlen         =       sizeof(int),
3884                         .mode           =       0644,
3885                         .proc_handler   =       &proc_dointvec,
3886                 },
3887                 {
3888                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3889                         .procname       =       "dad_transmits",
3890                         .data           =       &ipv6_devconf.dad_transmits,
3891                         .maxlen         =       sizeof(int),
3892                         .mode           =       0644,
3893                         .proc_handler   =       &proc_dointvec,
3894                 },
3895                 {
3896                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3897                         .procname       =       "router_solicitations",
3898                         .data           =       &ipv6_devconf.rtr_solicits,
3899                         .maxlen         =       sizeof(int),
3900                         .mode           =       0644,
3901                         .proc_handler   =       &proc_dointvec,
3902                 },
3903                 {
3904                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3905                         .procname       =       "router_solicitation_interval",
3906                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3907                         .maxlen         =       sizeof(int),
3908                         .mode           =       0644,
3909                         .proc_handler   =       &proc_dointvec_jiffies,
3910                         .strategy       =       &sysctl_jiffies,
3911                 },
3912                 {
3913                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3914                         .procname       =       "router_solicitation_delay",
3915                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3916                         .maxlen         =       sizeof(int),
3917                         .mode           =       0644,
3918                         .proc_handler   =       &proc_dointvec_jiffies,
3919                         .strategy       =       &sysctl_jiffies,
3920                 },
3921                 {
3922                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3923                         .procname       =       "force_mld_version",
3924                         .data           =       &ipv6_devconf.force_mld_version,
3925                         .maxlen         =       sizeof(int),
3926                         .mode           =       0644,
3927                         .proc_handler   =       &proc_dointvec,
3928                 },
3929 #ifdef CONFIG_IPV6_PRIVACY
3930                 {
3931                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3932                         .procname       =       "use_tempaddr",
3933                         .data           =       &ipv6_devconf.use_tempaddr,
3934                         .maxlen         =       sizeof(int),
3935                         .mode           =       0644,
3936                         .proc_handler   =       &proc_dointvec,
3937                 },
3938                 {
3939                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3940                         .procname       =       "temp_valid_lft",
3941                         .data           =       &ipv6_devconf.temp_valid_lft,
3942                         .maxlen         =       sizeof(int),
3943                         .mode           =       0644,
3944                         .proc_handler   =       &proc_dointvec,
3945                 },
3946                 {
3947                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3948                         .procname       =       "temp_prefered_lft",
3949                         .data           =       &ipv6_devconf.temp_prefered_lft,
3950                         .maxlen         =       sizeof(int),
3951                         .mode           =       0644,
3952                         .proc_handler   =       &proc_dointvec,
3953                 },
3954                 {
3955                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3956                         .procname       =       "regen_max_retry",
3957                         .data           =       &ipv6_devconf.regen_max_retry,
3958                         .maxlen         =       sizeof(int),
3959                         .mode           =       0644,
3960                         .proc_handler   =       &proc_dointvec,
3961                 },
3962                 {
3963                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3964                         .procname       =       "max_desync_factor",
3965                         .data           =       &ipv6_devconf.max_desync_factor,
3966                         .maxlen         =       sizeof(int),
3967                         .mode           =       0644,
3968                         .proc_handler   =       &proc_dointvec,
3969                 },
3970 #endif
3971                 {
3972                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3973                         .procname       =       "max_addresses",
3974                         .data           =       &ipv6_devconf.max_addresses,
3975                         .maxlen         =       sizeof(int),
3976                         .mode           =       0644,
3977                         .proc_handler   =       &proc_dointvec,
3978                 },
3979                 {
3980                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3981                         .procname       =       "accept_ra_defrtr",
3982                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3983                         .maxlen         =       sizeof(int),
3984                         .mode           =       0644,
3985                         .proc_handler   =       &proc_dointvec,
3986                 },
3987                 {
3988                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3989                         .procname       =       "accept_ra_pinfo",
3990                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3991                         .maxlen         =       sizeof(int),
3992                         .mode           =       0644,
3993                         .proc_handler   =       &proc_dointvec,
3994                 },
3995 #ifdef CONFIG_IPV6_ROUTER_PREF
3996                 {
3997                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3998                         .procname       =       "accept_ra_rtr_pref",
3999                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4000                         .maxlen         =       sizeof(int),
4001                         .mode           =       0644,
4002                         .proc_handler   =       &proc_dointvec,
4003                 },
4004                 {
4005                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4006                         .procname       =       "router_probe_interval",
4007                         .data           =       &ipv6_devconf.rtr_probe_interval,
4008                         .maxlen         =       sizeof(int),
4009                         .mode           =       0644,
4010                         .proc_handler   =       &proc_dointvec_jiffies,
4011                         .strategy       =       &sysctl_jiffies,
4012                 },
4013 #ifdef CONFIG_IPV6_ROUTE_INFO
4014                 {
4015                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4016                         .procname       =       "accept_ra_rt_info_max_plen",
4017                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4018                         .maxlen         =       sizeof(int),
4019                         .mode           =       0644,
4020                         .proc_handler   =       &proc_dointvec,
4021                 },
4022 #endif
4023 #endif
4024                 {
4025                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4026                         .procname       =       "proxy_ndp",
4027                         .data           =       &ipv6_devconf.proxy_ndp,
4028                         .maxlen         =       sizeof(int),
4029                         .mode           =       0644,
4030                         .proc_handler   =       &proc_dointvec,
4031                 },
4032                 {
4033                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4034                         .procname       =       "accept_source_route",
4035                         .data           =       &ipv6_devconf.accept_source_route,
4036                         .maxlen         =       sizeof(int),
4037                         .mode           =       0644,
4038                         .proc_handler   =       &proc_dointvec,
4039                 },
4040 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4041                 {
4042                         .ctl_name       =       CTL_UNNUMBERED,
4043                         .procname       =       "optimistic_dad",
4044                         .data           =       &ipv6_devconf.optimistic_dad,
4045                         .maxlen         =       sizeof(int),
4046                         .mode           =       0644,
4047                         .proc_handler   =       &proc_dointvec,
4048
4049                 },
4050 #endif
4051                 {
4052                         .ctl_name       =       0,      /* sentinel */
4053                 }
4054         },
4055         .addrconf_dev = {
4056                 {
4057                         .ctl_name       =       NET_PROTO_CONF_ALL,
4058                         .procname       =       "all",
4059                         .mode           =       0555,
4060                         .child          =       addrconf_sysctl.addrconf_vars,
4061                 },
4062                 {
4063                         .ctl_name       =       0,      /* sentinel */
4064                 }
4065         },
4066         .addrconf_conf_dir = {
4067                 {
4068                         .ctl_name       =       NET_IPV6_CONF,
4069                         .procname       =       "conf",
4070                         .mode           =       0555,
4071                         .child          =       addrconf_sysctl.addrconf_dev,
4072                 },
4073                 {
4074                         .ctl_name       =       0,      /* sentinel */
4075                 }
4076         },
4077         .addrconf_proto_dir = {
4078                 {
4079                         .ctl_name       =       NET_IPV6,
4080                         .procname       =       "ipv6",
4081                         .mode           =       0555,
4082                         .child          =       addrconf_sysctl.addrconf_conf_dir,
4083                 },
4084                 {
4085                         .ctl_name       =       0,      /* sentinel */
4086                 }
4087         },
4088         .addrconf_root_dir = {
4089                 {
4090                         .ctl_name       =       CTL_NET,
4091                         .procname       =       "net",
4092                         .mode           =       0555,
4093                         .child          =       addrconf_sysctl.addrconf_proto_dir,
4094                 },
4095                 {
4096                         .ctl_name       =       0,      /* sentinel */
4097                 }
4098         },
4099 };
4100
4101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4102 {
4103         int i;
4104         struct net_device *dev = idev ? idev->dev : NULL;
4105         struct addrconf_sysctl_table *t;
4106         char *dev_name = NULL;
4107
4108         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4109         if (t == NULL)
4110                 return;
4111         for (i=0; t->addrconf_vars[i].data; i++) {
4112                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4113                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4114         }
4115         if (dev) {
4116                 dev_name = dev->name;
4117                 t->addrconf_dev[0].ctl_name = dev->ifindex;
4118         } else {
4119                 dev_name = "default";
4120                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4121         }
4122
4123         /*
4124          * Make a copy of dev_name, because '.procname' is regarded as const
4125          * by sysctl and we wouldn't want anyone to change it under our feet
4126          * (see SIOCSIFNAME).
4127          */
4128         dev_name = kstrdup(dev_name, GFP_KERNEL);
4129         if (!dev_name)
4130             goto free;
4131
4132         t->addrconf_dev[0].procname = dev_name;
4133
4134         t->addrconf_dev[0].child = t->addrconf_vars;
4135         t->addrconf_conf_dir[0].child = t->addrconf_dev;
4136         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4137         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4138
4139         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4140         if (t->sysctl_header == NULL)
4141                 goto free_procname;
4142         else
4143                 p->sysctl = t;
4144         return;
4145
4146         /* error path */
4147  free_procname:
4148         kfree(dev_name);
4149  free:
4150         kfree(t);
4151
4152         return;
4153 }
4154
4155 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4156 {
4157         if (p->sysctl) {
4158                 struct addrconf_sysctl_table *t = p->sysctl;
4159                 p->sysctl = NULL;
4160                 unregister_sysctl_table(t->sysctl_header);
4161                 kfree(t->addrconf_dev[0].procname);
4162                 kfree(t);
4163         }
4164 }
4165
4166
4167 #endif
4168
4169 /*
4170  *      Device notifier
4171  */
4172
4173 int register_inet6addr_notifier(struct notifier_block *nb)
4174 {
4175         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4176 }
4177
4178 EXPORT_SYMBOL(register_inet6addr_notifier);
4179
4180 int unregister_inet6addr_notifier(struct notifier_block *nb)
4181 {
4182         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4183 }
4184
4185 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4186
4187 /*
4188  *      Init / cleanup code
4189  */
4190
4191 int __init addrconf_init(void)
4192 {
4193         int err;
4194
4195         if ((err = ipv6_addr_label_init()) < 0) {
4196                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4197                         err);
4198                 return err;
4199         }
4200
4201         /* The addrconf netdev notifier requires that loopback_dev
4202          * has it's ipv6 private information allocated and setup
4203          * before it can bring up and give link-local addresses
4204          * to other devices which are up.
4205          *
4206          * Unfortunately, loopback_dev is not necessarily the first
4207          * entry in the global dev_base list of net devices.  In fact,
4208          * it is likely to be the very last entry on that list.
4209          * So this causes the notifier registry below to try and
4210          * give link-local addresses to all devices besides loopback_dev
4211          * first, then loopback_dev, which cases all the non-loopback_dev
4212          * devices to fail to get a link-local address.
4213          *
4214          * So, as a temporary fix, allocate the ipv6 structure for
4215          * loopback_dev first by hand.
4216          * Longer term, all of the dependencies ipv6 has upon the loopback
4217          * device and it being up should be removed.
4218          */
4219         rtnl_lock();
4220         if (!ipv6_add_dev(init_net.loopback_dev))
4221                 err = -ENOMEM;
4222         rtnl_unlock();
4223         if (err)
4224                 return err;
4225
4226         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4227         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4228 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4229         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4230         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4231         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4232         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4233 #endif
4234
4235         register_netdevice_notifier(&ipv6_dev_notf);
4236
4237         addrconf_verify(0);
4238
4239         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4240         if (err < 0)
4241                 goto errout;
4242
4243         /* Only the first call to __rtnl_register can fail */
4244         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4245         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4246         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4247         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4248         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4249
4250         ipv6_addr_label_rtnl_register();
4251
4252 #ifdef CONFIG_SYSCTL
4253         addrconf_sysctl.sysctl_header =
4254                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4255         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4256 #endif
4257
4258         return 0;
4259 errout:
4260         unregister_netdevice_notifier(&ipv6_dev_notf);
4261
4262         return err;
4263 }
4264
4265 void __exit addrconf_cleanup(void)
4266 {
4267         struct net_device *dev;
4268         struct inet6_ifaddr *ifa;
4269         int i;
4270
4271         unregister_netdevice_notifier(&ipv6_dev_notf);
4272
4273 #ifdef CONFIG_SYSCTL
4274         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4275         addrconf_sysctl_unregister(&ipv6_devconf);
4276 #endif
4277
4278         rtnl_lock();
4279
4280         /*
4281          *      clean dev list.
4282          */
4283
4284         for_each_netdev(&init_net, dev) {
4285                 if (__in6_dev_get(dev) == NULL)
4286                         continue;
4287                 addrconf_ifdown(dev, 1);
4288         }
4289         addrconf_ifdown(init_net.loopback_dev, 2);
4290
4291         /*
4292          *      Check hash table.
4293          */
4294
4295         write_lock_bh(&addrconf_hash_lock);
4296         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4297                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4298                         struct inet6_ifaddr *bifa;
4299
4300                         bifa = ifa;
4301                         ifa = ifa->lst_next;
4302                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4303                         /* Do not free it; something is wrong.
4304                            Now we can investigate it with debugger.
4305                          */
4306                 }
4307         }
4308         write_unlock_bh(&addrconf_hash_lock);
4309
4310         del_timer(&addr_chk_timer);
4311
4312         rtnl_unlock();
4313 }