net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <asm/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90
  91 /* Set to 3 to get tracing... */
  92 #define ACONF_DEBUG 2
  93
  94 #if ACONF_DEBUG >= 3
  95 #define ADBG(x) printk x
  96 #else
  97 #define ADBG(x)
  98 #endif
  99
 100 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 102
 103 #ifdef CONFIG_SYSCTL
 104 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 105 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 106 #endif
 107
 108 #ifdef CONFIG_IPV6_PRIVACY
 109 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 110 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 111 static void ipv6_regen_rndid(unsigned long data);
 112
 113 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 114 #endif
 115
 116 static int ipv6_count_addresses(struct inet6_dev *idev);
 117
 118 /*
 119  *      Configured unicast address hash table
 120  */
 121 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 122 static DEFINE_RWLOCK(addrconf_hash_lock);
 123
 124 static void addrconf_verify(unsigned long);
 125
 126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 127 static DEFINE_SPINLOCK(addrconf_verify_lock);
 128
 129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 131
 132 static int addrconf_ifdown(struct net_device *dev, int how);
 133
 134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 135 static void addrconf_dad_timer(unsigned long data);
 136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 137 static void addrconf_dad_run(struct inet6_dev *idev);
 138 static void addrconf_rs_timer(unsigned long data);
 139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 141
 142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 143                                 struct prefix_info *pinfo);
 144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 145
 146 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 147
 148 struct ipv6_devconf ipv6_devconf __read_mostly = {
 149         .forwarding             = 0,
 150         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 151         .mtu6                   = IPV6_MIN_MTU,
 152         .accept_ra              = 1,
 153         .accept_redirects       = 1,
 154         .autoconf               = 1,
 155         .force_mld_version      = 0,
 156         .dad_transmits          = 1,
 157         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 158         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 159         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 160 #ifdef CONFIG_IPV6_PRIVACY
 161         .use_tempaddr           = 0,
 162         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 163         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 164         .regen_max_retry        = REGEN_MAX_RETRY,
 165         .max_desync_factor      = MAX_DESYNC_FACTOR,
 166 #endif
 167         .max_addresses          = IPV6_MAX_ADDRESSES,
 168         .accept_ra_defrtr       = 1,
 169         .accept_ra_pinfo        = 1,
 170 #ifdef CONFIG_IPV6_ROUTER_PREF
 171         .accept_ra_rtr_pref     = 1,
 172         .rtr_probe_interval     = 60 * HZ,
 173 #ifdef CONFIG_IPV6_ROUTE_INFO
 174         .accept_ra_rt_info_max_plen = 0,
 175 #endif
 176 #endif
 177         .proxy_ndp              = 0,
 178         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 179 };
 180
 181 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 182         .forwarding             = 0,
 183         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 184         .mtu6                   = IPV6_MIN_MTU,
 185         .accept_ra              = 1,
 186         .accept_redirects       = 1,
 187         .autoconf               = 1,
 188         .dad_transmits          = 1,
 189         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 190         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 191         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 192 #ifdef CONFIG_IPV6_PRIVACY
 193         .use_tempaddr           = 0,
 194         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 195         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 196         .regen_max_retry        = REGEN_MAX_RETRY,
 197         .max_desync_factor      = MAX_DESYNC_FACTOR,
 198 #endif
 199         .max_addresses          = IPV6_MAX_ADDRESSES,
 200         .accept_ra_defrtr       = 1,
 201         .accept_ra_pinfo        = 1,
 202 #ifdef CONFIG_IPV6_ROUTER_PREF
 203         .accept_ra_rtr_pref     = 1,
 204         .rtr_probe_interval     = 60 * HZ,
 205 #ifdef CONFIG_IPV6_ROUTE_INFO
 206         .accept_ra_rt_info_max_plen = 0,
 207 #endif
 208 #endif
 209         .proxy_ndp              = 0,
 210         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 211 };
 212
 213 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 214 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 215 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 216
 217 /* Check if a valid qdisc is available */
 218 static inline int addrconf_qdisc_ok(struct net_device *dev)
 219 {
 220         return (dev->qdisc != &noop_qdisc);
 221 }
 222
 223 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 224 {
 225         if (del_timer(&ifp->timer))
 226                 __in6_ifa_put(ifp);
 227 }
 228
 229 enum addrconf_timer_t
 230 {
 231         AC_NONE,
 232         AC_DAD,
 233         AC_RS,
 234 };
 235
 236 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 237                                enum addrconf_timer_t what,
 238                                unsigned long when)
 239 {
 240         if (!del_timer(&ifp->timer))
 241                 in6_ifa_hold(ifp);
 242
 243         switch (what) {
 244         case AC_DAD:
 245                 ifp->timer.function = addrconf_dad_timer;
 246                 break;
 247         case AC_RS:
 248                 ifp->timer.function = addrconf_rs_timer;
 249                 break;
 250         default:;
 251         }
 252         ifp->timer.expires = jiffies + when;
 253         add_timer(&ifp->timer);
 254 }
 255
 256 static int snmp6_alloc_dev(struct inet6_dev *idev)
 257 {
 258         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 /* static matching label */
 878 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
 879 {
 880  /*
 881   *     prefix (longest match)  label
 882   *     -----------------------------
 883   *     ::1/128                 0
 884   *     ::/0                    1
 885   *     2002::/16               2
 886   *     ::/96                   3
 887   *     ::ffff:0:0/96           4
 888   *     fc00::/7                5
 889   *     2001::/32               6
 890   */
 891         if (type & IPV6_ADDR_LOOPBACK)
 892                 return 0;
 893         else if (type & IPV6_ADDR_COMPATv4)
 894                 return 3;
 895         else if (type & IPV6_ADDR_MAPPED)
 896                 return 4;
 897         else if (addr->s6_addr32[0] == htonl(0x20010000))
 898                 return 6;
 899         else if (addr->s6_addr16[0] == htons(0x2002))
 900                 return 2;
 901         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 902                 return 5;
 903         return 1;
 904 }
 905
 906 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 907                        struct in6_addr *daddr, struct in6_addr *saddr)
 908 {
 909         struct ipv6_saddr_score hiscore;
 910         struct inet6_ifaddr *ifa_result = NULL;
 911         int daddr_type = __ipv6_addr_type(daddr);
 912         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 913         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 914         struct net_device *dev;
 915
 916         memset(&hiscore, 0, sizeof(hiscore));
 917
 918         read_lock(&dev_base_lock);
 919         rcu_read_lock();
 920
 921         for_each_netdev(&init_net, dev) {
 922                 struct inet6_dev *idev;
 923                 struct inet6_ifaddr *ifa;
 924
 925                 /* Rule 0: Candidate Source Address (section 4)
 926                  *  - multicast and link-local destination address,
 927                  *    the set of candidate source address MUST only
 928                  *    include addresses assigned to interfaces
 929                  *    belonging to the same link as the outgoing
 930                  *    interface.
 931                  * (- For site-local destination addresses, the
 932                  *    set of candidate source addresses MUST only
 933                  *    include addresses assigned to interfaces
 934                  *    belonging to the same site as the outgoing
 935                  *    interface.)
 936                  */
 937                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 938                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 939                     daddr_dev && dev != daddr_dev)
 940                         continue;
 941
 942                 idev = __in6_dev_get(dev);
 943                 if (!idev)
 944                         continue;
 945
 946                 read_lock_bh(&idev->lock);
 947                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 948                         struct ipv6_saddr_score score;
 949
 950                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 951
 952                         /* Rule 0:
 953                          * - Tentative Address (RFC2462 section 5.4)
 954                          *  - A tentative address is not considered
 955                          *    "assigned to an interface" in the traditional
 956                          *    sense, unless it is also flagged as optimistic.
 957                          * - Candidate Source Address (section 4)
 958                          *  - In any case, anycast addresses, multicast
 959                          *    addresses, and the unspecified address MUST
 960                          *    NOT be included in a candidate set.
 961                          */
 962                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 963                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 964                                 continue;
 965                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 966                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 967                                 LIMIT_NETDEBUG(KERN_DEBUG
 968                                                "ADDRCONF: unspecified / multicast address "
 969                                                "assigned as unicast address on %s",
 970                                                dev->name);
 971                                 continue;
 972                         }
 973
 974                         score.attrs = 0;
 975                         score.matchlen = 0;
 976                         score.scope = 0;
 977                         score.rule = 0;
 978
 979                         if (ifa_result == NULL) {
 980                                 /* record it if the first available entry */
 981                                 goto record_it;
 982                         }
 983
 984                         /* Rule 1: Prefer same address */
 985                         if (hiscore.rule < 1) {
 986                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 987                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 988                                 hiscore.rule++;
 989                         }
 990                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 991                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 992                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 993                                         score.rule = 1;
 994                                         goto record_it;
 995                                 }
 996                         } else {
 997                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 998                                         continue;
 999                         }
1000
1001                         /* Rule 2: Prefer appropriate scope */
1002                         if (hiscore.rule < 2) {
1003                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1004                                 hiscore.rule++;
1005                         }
1006                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1007                         if (hiscore.scope < score.scope) {
1008                                 if (hiscore.scope < daddr_scope) {
1009                                         score.rule = 2;
1010                                         goto record_it;
1011                                 } else
1012                                         continue;
1013                         } else if (score.scope < hiscore.scope) {
1014                                 if (score.scope < daddr_scope)
1015                                         break; /* addresses sorted by scope */
1016                                 else {
1017                                         score.rule = 2;
1018                                         goto record_it;
1019                                 }
1020                         }
1021
1022                         /* Rule 3: Avoid deprecated and optimistic addresses */
1023                         if (hiscore.rule < 3) {
1024                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1025                                    (((ifa_result->flags &
1026                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1027                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1028                                 hiscore.rule++;
1029                         }
1030                         if (ipv6_saddr_preferred(score.addr_type) ||
1031                            (((ifa->flags &
1032                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1033                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1034                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1035                                         score.rule = 3;
1036                                         goto record_it;
1037                                 }
1038                         } else {
1039                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1040                                         continue;
1041                         }
1042
1043                         /* Rule 4: Prefer home address */
1044 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1045                         if (hiscore.rule < 4) {
1046                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1047                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1048                                 hiscore.rule++;
1049                         }
1050                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1051                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1052                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1053                                         score.rule = 4;
1054                                         goto record_it;
1055                                 }
1056                         } else {
1057                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1058                                         continue;
1059                         }
1060 #else
1061                         if (hiscore.rule < 4)
1062                                 hiscore.rule++;
1063 #endif
1064
1065                         /* Rule 5: Prefer outgoing interface */
1066                         if (hiscore.rule < 5) {
1067                                 if (daddr_dev == NULL ||
1068                                     daddr_dev == ifa_result->idev->dev)
1069                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1070                                 hiscore.rule++;
1071                         }
1072                         if (daddr_dev == NULL ||
1073                             daddr_dev == ifa->idev->dev) {
1074                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1075                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1076                                         score.rule = 5;
1077                                         goto record_it;
1078                                 }
1079                         } else {
1080                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1081                                         continue;
1082                         }
1083
1084                         /* Rule 6: Prefer matching label */
1085                         if (hiscore.rule < 6) {
1086                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1087                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1088                                 hiscore.rule++;
1089                         }
1090                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1091                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1092                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1093                                         score.rule = 6;
1094                                         goto record_it;
1095                                 }
1096                         } else {
1097                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1098                                         continue;
1099                         }
1100
1101 #ifdef CONFIG_IPV6_PRIVACY
1102                         /* Rule 7: Prefer public address
1103                          * Note: prefer temprary address if use_tempaddr >= 2
1104                          */
1105                         if (hiscore.rule < 7) {
1106                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1107                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1108                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1109                                 hiscore.rule++;
1110                         }
1111                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1112                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1113                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1114                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1115                                         score.rule = 7;
1116                                         goto record_it;
1117                                 }
1118                         } else {
1119                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1120                                         continue;
1121                         }
1122 #else
1123                         if (hiscore.rule < 7)
1124                                 hiscore.rule++;
1125 #endif
1126                         /* Rule 8: Use longest matching prefix */
1127                         if (hiscore.rule < 8) {
1128                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1129                                 hiscore.rule++;
1130                         }
1131                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1132                         if (score.matchlen > hiscore.matchlen) {
1133                                 score.rule = 8;
1134                                 goto record_it;
1135                         }
1136 #if 0
1137                         else if (score.matchlen < hiscore.matchlen)
1138                                 continue;
1139 #endif
1140
1141                         /* Final Rule: choose first available one */
1142                         continue;
1143 record_it:
1144                         if (ifa_result)
1145                                 in6_ifa_put(ifa_result);
1146                         in6_ifa_hold(ifa);
1147                         ifa_result = ifa;
1148                         hiscore = score;
1149                 }
1150                 read_unlock_bh(&idev->lock);
1151         }
1152         rcu_read_unlock();
1153         read_unlock(&dev_base_lock);
1154
1155         if (!ifa_result)
1156                 return -EADDRNOTAVAIL;
1157
1158         ipv6_addr_copy(saddr, &ifa_result->addr);
1159         in6_ifa_put(ifa_result);
1160         return 0;
1161 }
1162
1163
1164 int ipv6_get_saddr(struct dst_entry *dst,
1165                    struct in6_addr *daddr, struct in6_addr *saddr)
1166 {
1167         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1168 }
1169
1170 EXPORT_SYMBOL(ipv6_get_saddr);
1171
1172 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1173                     unsigned char banned_flags)
1174 {
1175         struct inet6_dev *idev;
1176         int err = -EADDRNOTAVAIL;
1177
1178         rcu_read_lock();
1179         if ((idev = __in6_dev_get(dev)) != NULL) {
1180                 struct inet6_ifaddr *ifp;
1181
1182                 read_lock_bh(&idev->lock);
1183                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1184                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1185                                 ipv6_addr_copy(addr, &ifp->addr);
1186                                 err = 0;
1187                                 break;
1188                         }
1189                 }
1190                 read_unlock_bh(&idev->lock);
1191         }
1192         rcu_read_unlock();
1193         return err;
1194 }
1195
1196 static int ipv6_count_addresses(struct inet6_dev *idev)
1197 {
1198         int cnt = 0;
1199         struct inet6_ifaddr *ifp;
1200
1201         read_lock_bh(&idev->lock);
1202         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1203                 cnt++;
1204         read_unlock_bh(&idev->lock);
1205         return cnt;
1206 }
1207
1208 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1209 {
1210         struct inet6_ifaddr * ifp;
1211         u8 hash = ipv6_addr_hash(addr);
1212
1213         read_lock_bh(&addrconf_hash_lock);
1214         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1215                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1216                     !(ifp->flags&IFA_F_TENTATIVE)) {
1217                         if (dev == NULL || ifp->idev->dev == dev ||
1218                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1219                                 break;
1220                 }
1221         }
1222         read_unlock_bh(&addrconf_hash_lock);
1223         return ifp != NULL;
1224 }
1225
1226 EXPORT_SYMBOL(ipv6_chk_addr);
1227
1228 static
1229 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1230 {
1231         struct inet6_ifaddr * ifp;
1232         u8 hash = ipv6_addr_hash(addr);
1233
1234         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1235                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1236                         if (dev == NULL || ifp->idev->dev == dev)
1237                                 break;
1238                 }
1239         }
1240         return ifp != NULL;
1241 }
1242
1243 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1244 {
1245         struct inet6_ifaddr * ifp;
1246         u8 hash = ipv6_addr_hash(addr);
1247
1248         read_lock_bh(&addrconf_hash_lock);
1249         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1250                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1251                         if (dev == NULL || ifp->idev->dev == dev ||
1252                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1253                                 in6_ifa_hold(ifp);
1254                                 break;
1255                         }
1256                 }
1257         }
1258         read_unlock_bh(&addrconf_hash_lock);
1259
1260         return ifp;
1261 }
1262
1263 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1264 {
1265         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1266         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1267         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1268         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1269         int sk_ipv6only = ipv6_only_sock(sk);
1270         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1271         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1272         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1273
1274         if (!sk2_rcv_saddr && !sk_ipv6only)
1275                 return 1;
1276
1277         if (addr_type2 == IPV6_ADDR_ANY &&
1278             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1279                 return 1;
1280
1281         if (addr_type == IPV6_ADDR_ANY &&
1282             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1283                 return 1;
1284
1285         if (sk2_rcv_saddr6 &&
1286             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1287                 return 1;
1288
1289         if (addr_type == IPV6_ADDR_MAPPED &&
1290             !sk2_ipv6only &&
1291             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1292                 return 1;
1293
1294         return 0;
1295 }
1296
1297 /* Gets referenced address, destroys ifaddr */
1298
1299 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1300 {
1301         if (ifp->flags&IFA_F_PERMANENT) {
1302                 spin_lock_bh(&ifp->lock);
1303                 addrconf_del_timer(ifp);
1304                 ifp->flags |= IFA_F_TENTATIVE;
1305                 spin_unlock_bh(&ifp->lock);
1306                 in6_ifa_put(ifp);
1307 #ifdef CONFIG_IPV6_PRIVACY
1308         } else if (ifp->flags&IFA_F_TEMPORARY) {
1309                 struct inet6_ifaddr *ifpub;
1310                 spin_lock_bh(&ifp->lock);
1311                 ifpub = ifp->ifpub;
1312                 if (ifpub) {
1313                         in6_ifa_hold(ifpub);
1314                         spin_unlock_bh(&ifp->lock);
1315                         ipv6_create_tempaddr(ifpub, ifp);
1316                         in6_ifa_put(ifpub);
1317                 } else {
1318                         spin_unlock_bh(&ifp->lock);
1319                 }
1320                 ipv6_del_addr(ifp);
1321 #endif
1322         } else
1323                 ipv6_del_addr(ifp);
1324 }
1325
1326 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1327 {
1328         if (net_ratelimit())
1329                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1330         addrconf_dad_stop(ifp);
1331 }
1332
1333 /* Join to solicited addr multicast group. */
1334
1335 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1336 {
1337         struct in6_addr maddr;
1338
1339         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1340                 return;
1341
1342         addrconf_addr_solict_mult(addr, &maddr);
1343         ipv6_dev_mc_inc(dev, &maddr);
1344 }
1345
1346 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1347 {
1348         struct in6_addr maddr;
1349
1350         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1351                 return;
1352
1353         addrconf_addr_solict_mult(addr, &maddr);
1354         __ipv6_dev_mc_dec(idev, &maddr);
1355 }
1356
1357 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1358 {
1359         struct in6_addr addr;
1360         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1361         if (ipv6_addr_any(&addr))
1362                 return;
1363         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1364 }
1365
1366 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1367 {
1368         struct in6_addr addr;
1369         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1370         if (ipv6_addr_any(&addr))
1371                 return;
1372         __ipv6_dev_ac_dec(ifp->idev, &addr);
1373 }
1374
1375 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1376 {
1377         if (dev->addr_len != ETH_ALEN)
1378                 return -1;
1379         memcpy(eui, dev->dev_addr, 3);
1380         memcpy(eui + 5, dev->dev_addr + 3, 3);
1381
1382         /*
1383          * The zSeries OSA network cards can be shared among various
1384          * OS instances, but the OSA cards have only one MAC address.
1385          * This leads to duplicate address conflicts in conjunction
1386          * with IPv6 if more than one instance uses the same card.
1387          *
1388          * The driver for these cards can deliver a unique 16-bit
1389          * identifier for each instance sharing the same card.  It is
1390          * placed instead of 0xFFFE in the interface identifier.  The
1391          * "u" bit of the interface identifier is not inverted in this
1392          * case.  Hence the resulting interface identifier has local
1393          * scope according to RFC2373.
1394          */
1395         if (dev->dev_id) {
1396                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1397                 eui[4] = dev->dev_id & 0xFF;
1398         } else {
1399                 eui[3] = 0xFF;
1400                 eui[4] = 0xFE;
1401                 eui[0] ^= 2;
1402         }
1403         return 0;
1404 }
1405
1406 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1407 {
1408         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1409         if (dev->addr_len != ARCNET_ALEN)
1410                 return -1;
1411         memset(eui, 0, 7);
1412         eui[7] = *(u8*)dev->dev_addr;
1413         return 0;
1414 }
1415
1416 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1417 {
1418         if (dev->addr_len != INFINIBAND_ALEN)
1419                 return -1;
1420         memcpy(eui, dev->dev_addr + 12, 8);
1421         eui[0] |= 2;
1422         return 0;
1423 }
1424
1425 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1426 {
1427         switch (dev->type) {
1428         case ARPHRD_ETHER:
1429         case ARPHRD_FDDI:
1430         case ARPHRD_IEEE802_TR:
1431                 return addrconf_ifid_eui48(eui, dev);
1432         case ARPHRD_ARCNET:
1433                 return addrconf_ifid_arcnet(eui, dev);
1434         case ARPHRD_INFINIBAND:
1435                 return addrconf_ifid_infiniband(eui, dev);
1436         }
1437         return -1;
1438 }
1439
1440 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1441 {
1442         int err = -1;
1443         struct inet6_ifaddr *ifp;
1444
1445         read_lock_bh(&idev->lock);
1446         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1447                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1448                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1449                         err = 0;
1450                         break;
1451                 }
1452         }
1453         read_unlock_bh(&idev->lock);
1454         return err;
1455 }
1456
1457 #ifdef CONFIG_IPV6_PRIVACY
1458 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1459 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1460 {
1461 regen:
1462         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1463         idev->rndid[0] &= ~0x02;
1464
1465         /*
1466          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1467          * check if generated address is not inappropriate
1468          *
1469          *  - Reserved subnet anycast (RFC 2526)
1470          *      11111101 11....11 1xxxxxxx
1471          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1472          *      00-00-5E-FE-xx-xx-xx-xx
1473          *  - value 0
1474          *  - XXX: already assigned to an address on the device
1475          */
1476         if (idev->rndid[0] == 0xfd &&
1477             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1478             (idev->rndid[7]&0x80))
1479                 goto regen;
1480         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1481                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1482                         goto regen;
1483                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1484                         goto regen;
1485         }
1486
1487         return 0;
1488 }
1489
1490 static void ipv6_regen_rndid(unsigned long data)
1491 {
1492         struct inet6_dev *idev = (struct inet6_dev *) data;
1493         unsigned long expires;
1494
1495         rcu_read_lock_bh();
1496         write_lock_bh(&idev->lock);
1497
1498         if (idev->dead)
1499                 goto out;
1500
1501         if (__ipv6_regen_rndid(idev) < 0)
1502                 goto out;
1503
1504         expires = jiffies +
1505                 idev->cnf.temp_prefered_lft * HZ -
1506                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1507         if (time_before(expires, jiffies)) {
1508                 printk(KERN_WARNING
1509                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1510                         idev->dev->name);
1511                 goto out;
1512         }
1513
1514         if (!mod_timer(&idev->regen_timer, expires))
1515                 in6_dev_hold(idev);
1516
1517 out:
1518         write_unlock_bh(&idev->lock);
1519         rcu_read_unlock_bh();
1520         in6_dev_put(idev);
1521 }
1522
1523 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1524         int ret = 0;
1525
1526         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1527                 ret = __ipv6_regen_rndid(idev);
1528         return ret;
1529 }
1530 #endif
1531
1532 /*
1533  *      Add prefix route.
1534  */
1535
1536 static void
1537 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1538                       unsigned long expires, u32 flags)
1539 {
1540         struct fib6_config cfg = {
1541                 .fc_table = RT6_TABLE_PREFIX,
1542                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1543                 .fc_ifindex = dev->ifindex,
1544                 .fc_expires = expires,
1545                 .fc_dst_len = plen,
1546                 .fc_flags = RTF_UP | flags,
1547         };
1548
1549         ipv6_addr_copy(&cfg.fc_dst, pfx);
1550
1551         /* Prevent useless cloning on PtP SIT.
1552            This thing is done here expecting that the whole
1553            class of non-broadcast devices need not cloning.
1554          */
1555 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1556         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1557                 cfg.fc_flags |= RTF_NONEXTHOP;
1558 #endif
1559
1560         ip6_route_add(&cfg);
1561 }
1562
1563 /* Create "default" multicast route to the interface */
1564
1565 static void addrconf_add_mroute(struct net_device *dev)
1566 {
1567         struct fib6_config cfg = {
1568                 .fc_table = RT6_TABLE_LOCAL,
1569                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1570                 .fc_ifindex = dev->ifindex,
1571                 .fc_dst_len = 8,
1572                 .fc_flags = RTF_UP,
1573         };
1574
1575         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1576
1577         ip6_route_add(&cfg);
1578 }
1579
1580 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1581 static void sit_route_add(struct net_device *dev)
1582 {
1583         struct fib6_config cfg = {
1584                 .fc_table = RT6_TABLE_MAIN,
1585                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1586                 .fc_ifindex = dev->ifindex,
1587                 .fc_dst_len = 96,
1588                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1589         };
1590
1591         /* prefix length - 96 bits "::d.d.d.d" */
1592         ip6_route_add(&cfg);
1593 }
1594 #endif
1595
1596 static void addrconf_add_lroute(struct net_device *dev)
1597 {
1598         struct in6_addr addr;
1599
1600         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1601         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1602 }
1603
1604 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1605 {
1606         struct inet6_dev *idev;
1607
1608         ASSERT_RTNL();
1609
1610         if ((idev = ipv6_find_idev(dev)) == NULL)
1611                 return NULL;
1612
1613         /* Add default multicast route */
1614         addrconf_add_mroute(dev);
1615
1616         /* Add link local route */
1617         addrconf_add_lroute(dev);
1618         return idev;
1619 }
1620
1621 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1622 {
1623         struct prefix_info *pinfo;
1624         __u32 valid_lft;
1625         __u32 prefered_lft;
1626         int addr_type;
1627         unsigned long rt_expires;
1628         struct inet6_dev *in6_dev;
1629
1630         pinfo = (struct prefix_info *) opt;
1631
1632         if (len < sizeof(struct prefix_info)) {
1633                 ADBG(("addrconf: prefix option too short\n"));
1634                 return;
1635         }
1636
1637         /*
1638          *      Validation checks ([ADDRCONF], page 19)
1639          */
1640
1641         addr_type = ipv6_addr_type(&pinfo->prefix);
1642
1643         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1644                 return;
1645
1646         valid_lft = ntohl(pinfo->valid);
1647         prefered_lft = ntohl(pinfo->prefered);
1648
1649         if (prefered_lft > valid_lft) {
1650                 if (net_ratelimit())
1651                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1652                 return;
1653         }
1654
1655         in6_dev = in6_dev_get(dev);
1656
1657         if (in6_dev == NULL) {
1658                 if (net_ratelimit())
1659                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1660                 return;
1661         }
1662
1663         /*
1664          *      Two things going on here:
1665          *      1) Add routes for on-link prefixes
1666          *      2) Configure prefixes with the auto flag set
1667          */
1668
1669         /* Avoid arithmetic overflow. Really, we could
1670            save rt_expires in seconds, likely valid_lft,
1671            but it would require division in fib gc, that it
1672            not good.
1673          */
1674         if (valid_lft >= 0x7FFFFFFF/HZ)
1675                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1676         else
1677                 rt_expires = valid_lft * HZ;
1678
1679         /*
1680          * We convert this (in jiffies) to clock_t later.
1681          * Avoid arithmetic overflow there as well.
1682          * Overflow can happen only if HZ < USER_HZ.
1683          */
1684         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1685                 rt_expires = 0x7FFFFFFF / USER_HZ;
1686
1687         if (pinfo->onlink) {
1688                 struct rt6_info *rt;
1689                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1690
1691                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1692                         if (rt->rt6i_flags&RTF_EXPIRES) {
1693                                 if (valid_lft == 0) {
1694                                         ip6_del_rt(rt);
1695                                         rt = NULL;
1696                                 } else {
1697                                         rt->rt6i_expires = jiffies + rt_expires;
1698                                 }
1699                         }
1700                 } else if (valid_lft) {
1701                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1702                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1703                 }
1704                 if (rt)
1705                         dst_release(&rt->u.dst);
1706         }
1707
1708         /* Try to figure out our local address for this prefix */
1709
1710         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1711                 struct inet6_ifaddr * ifp;
1712                 struct in6_addr addr;
1713                 int create = 0, update_lft = 0;
1714
1715                 if (pinfo->prefix_len == 64) {
1716                         memcpy(&addr, &pinfo->prefix, 8);
1717                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1718                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1719                                 in6_dev_put(in6_dev);
1720                                 return;
1721                         }
1722                         goto ok;
1723                 }
1724                 if (net_ratelimit())
1725                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1726                                pinfo->prefix_len);
1727                 in6_dev_put(in6_dev);
1728                 return;
1729
1730 ok:
1731
1732                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1733
1734                 if (ifp == NULL && valid_lft) {
1735                         int max_addresses = in6_dev->cnf.max_addresses;
1736                         u32 addr_flags = 0;
1737
1738 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1739                         if (in6_dev->cnf.optimistic_dad &&
1740                             !ipv6_devconf.forwarding)
1741                                 addr_flags = IFA_F_OPTIMISTIC;
1742 #endif
1743
1744                         /* Do not allow to create too much of autoconfigured
1745                          * addresses; this would be too easy way to crash kernel.
1746                          */
1747                         if (!max_addresses ||
1748                             ipv6_count_addresses(in6_dev) < max_addresses)
1749                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1750                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1751                                                     addr_flags);
1752
1753                         if (!ifp || IS_ERR(ifp)) {
1754                                 in6_dev_put(in6_dev);
1755                                 return;
1756                         }
1757
1758                         update_lft = create = 1;
1759                         ifp->cstamp = jiffies;
1760                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1761                 }
1762
1763                 if (ifp) {
1764                         int flags;
1765                         unsigned long now;
1766 #ifdef CONFIG_IPV6_PRIVACY
1767                         struct inet6_ifaddr *ift;
1768 #endif
1769                         u32 stored_lft;
1770
1771                         /* update lifetime (RFC2462 5.5.3 e) */
1772                         spin_lock(&ifp->lock);
1773                         now = jiffies;
1774                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1775                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1776                         else
1777                                 stored_lft = 0;
1778                         if (!update_lft && stored_lft) {
1779                                 if (valid_lft > MIN_VALID_LIFETIME ||
1780                                     valid_lft > stored_lft)
1781                                         update_lft = 1;
1782                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1783                                         /* valid_lft <= stored_lft is always true */
1784                                         /* XXX: IPsec */
1785                                         update_lft = 0;
1786                                 } else {
1787                                         valid_lft = MIN_VALID_LIFETIME;
1788                                         if (valid_lft < prefered_lft)
1789                                                 prefered_lft = valid_lft;
1790                                         update_lft = 1;
1791                                 }
1792                         }
1793
1794                         if (update_lft) {
1795                                 ifp->valid_lft = valid_lft;
1796                                 ifp->prefered_lft = prefered_lft;
1797                                 ifp->tstamp = now;
1798                                 flags = ifp->flags;
1799                                 ifp->flags &= ~IFA_F_DEPRECATED;
1800                                 spin_unlock(&ifp->lock);
1801
1802                                 if (!(flags&IFA_F_TENTATIVE))
1803                                         ipv6_ifa_notify(0, ifp);
1804                         } else
1805                                 spin_unlock(&ifp->lock);
1806
1807 #ifdef CONFIG_IPV6_PRIVACY
1808                         read_lock_bh(&in6_dev->lock);
1809                         /* update all temporary addresses in the list */
1810                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1811                                 /*
1812                                  * When adjusting the lifetimes of an existing
1813                                  * temporary address, only lower the lifetimes.
1814                                  * Implementations must not increase the
1815                                  * lifetimes of an existing temporary address
1816                                  * when processing a Prefix Information Option.
1817                                  */
1818                                 spin_lock(&ift->lock);
1819                                 flags = ift->flags;
1820                                 if (ift->valid_lft > valid_lft &&
1821                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1822                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1823                                 if (ift->prefered_lft > prefered_lft &&
1824                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1825                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1826                                 spin_unlock(&ift->lock);
1827                                 if (!(flags&IFA_F_TENTATIVE))
1828                                         ipv6_ifa_notify(0, ift);
1829                         }
1830
1831                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1832                                 /*
1833                                  * When a new public address is created as described in [ADDRCONF],
1834                                  * also create a new temporary address.
1835                                  */
1836                                 read_unlock_bh(&in6_dev->lock);
1837                                 ipv6_create_tempaddr(ifp, NULL);
1838                         } else {
1839                                 read_unlock_bh(&in6_dev->lock);
1840                         }
1841 #endif
1842                         in6_ifa_put(ifp);
1843                         addrconf_verify(0);
1844                 }
1845         }
1846         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1847         in6_dev_put(in6_dev);
1848 }
1849
1850 /*
1851  *      Set destination address.
1852  *      Special case for SIT interfaces where we create a new "virtual"
1853  *      device.
1854  */
1855 int addrconf_set_dstaddr(void __user *arg)
1856 {
1857         struct in6_ifreq ireq;
1858         struct net_device *dev;
1859         int err = -EINVAL;
1860
1861         rtnl_lock();
1862
1863         err = -EFAULT;
1864         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1865                 goto err_exit;
1866
1867         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1868
1869         err = -ENODEV;
1870         if (dev == NULL)
1871                 goto err_exit;
1872
1873 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1874         if (dev->type == ARPHRD_SIT) {
1875                 struct ifreq ifr;
1876                 mm_segment_t    oldfs;
1877                 struct ip_tunnel_parm p;
1878
1879                 err = -EADDRNOTAVAIL;
1880                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1881                         goto err_exit;
1882
1883                 memset(&p, 0, sizeof(p));
1884                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1885                 p.iph.saddr = 0;
1886                 p.iph.version = 4;
1887                 p.iph.ihl = 5;
1888                 p.iph.protocol = IPPROTO_IPV6;
1889                 p.iph.ttl = 64;
1890                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1891
1892                 oldfs = get_fs(); set_fs(KERNEL_DS);
1893                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1894                 set_fs(oldfs);
1895
1896                 if (err == 0) {
1897                         err = -ENOBUFS;
1898                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1899                                 goto err_exit;
1900                         err = dev_open(dev);
1901                 }
1902         }
1903 #endif
1904
1905 err_exit:
1906         rtnl_unlock();
1907         return err;
1908 }
1909
1910 /*
1911  *      Manual configuration of address on an interface
1912  */
1913 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1914                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1915 {
1916         struct inet6_ifaddr *ifp;
1917         struct inet6_dev *idev;
1918         struct net_device *dev;
1919         int scope;
1920         u32 flags = RTF_EXPIRES;
1921
1922         ASSERT_RTNL();
1923
1924         /* check the lifetime */
1925         if (!valid_lft || prefered_lft > valid_lft)
1926                 return -EINVAL;
1927
1928         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1929                 return -ENODEV;
1930
1931         if ((idev = addrconf_add_dev(dev)) == NULL)
1932                 return -ENOBUFS;
1933
1934         scope = ipv6_addr_scope(pfx);
1935
1936         if (valid_lft == INFINITY_LIFE_TIME) {
1937                 ifa_flags |= IFA_F_PERMANENT;
1938                 flags = 0;
1939         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1940                 valid_lft = 0x7FFFFFFF/HZ;
1941
1942         if (prefered_lft == 0)
1943                 ifa_flags |= IFA_F_DEPRECATED;
1944         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1945                  (prefered_lft != INFINITY_LIFE_TIME))
1946                 prefered_lft = 0x7FFFFFFF/HZ;
1947
1948         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1949
1950         if (!IS_ERR(ifp)) {
1951                 spin_lock_bh(&ifp->lock);
1952                 ifp->valid_lft = valid_lft;
1953                 ifp->prefered_lft = prefered_lft;
1954                 ifp->tstamp = jiffies;
1955                 spin_unlock_bh(&ifp->lock);
1956
1957                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1958                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1959                 /*
1960                  * Note that section 3.1 of RFC 4429 indicates
1961                  * that the Optimistic flag should not be set for
1962                  * manually configured addresses
1963                  */
1964                 addrconf_dad_start(ifp, 0);
1965                 in6_ifa_put(ifp);
1966                 addrconf_verify(0);
1967                 return 0;
1968         }
1969
1970         return PTR_ERR(ifp);
1971 }
1972
1973 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1974 {
1975         struct inet6_ifaddr *ifp;
1976         struct inet6_dev *idev;
1977         struct net_device *dev;
1978
1979         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1980                 return -ENODEV;
1981
1982         if ((idev = __in6_dev_get(dev)) == NULL)
1983                 return -ENXIO;
1984
1985         read_lock_bh(&idev->lock);
1986         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1987                 if (ifp->prefix_len == plen &&
1988                     ipv6_addr_equal(pfx, &ifp->addr)) {
1989                         in6_ifa_hold(ifp);
1990                         read_unlock_bh(&idev->lock);
1991
1992                         ipv6_del_addr(ifp);
1993
1994                         /* If the last address is deleted administratively,
1995                            disable IPv6 on this interface.
1996                          */
1997                         if (idev->addr_list == NULL)
1998                                 addrconf_ifdown(idev->dev, 1);
1999                         return 0;
2000                 }
2001         }
2002         read_unlock_bh(&idev->lock);
2003         return -EADDRNOTAVAIL;
2004 }
2005
2006
2007 int addrconf_add_ifaddr(void __user *arg)
2008 {
2009         struct in6_ifreq ireq;
2010         int err;
2011
2012         if (!capable(CAP_NET_ADMIN))
2013                 return -EPERM;
2014
2015         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2016                 return -EFAULT;
2017
2018         rtnl_lock();
2019         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2020                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2021         rtnl_unlock();
2022         return err;
2023 }
2024
2025 int addrconf_del_ifaddr(void __user *arg)
2026 {
2027         struct in6_ifreq ireq;
2028         int err;
2029
2030         if (!capable(CAP_NET_ADMIN))
2031                 return -EPERM;
2032
2033         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2034                 return -EFAULT;
2035
2036         rtnl_lock();
2037         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2038         rtnl_unlock();
2039         return err;
2040 }
2041
2042 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2043 static void sit_add_v4_addrs(struct inet6_dev *idev)
2044 {
2045         struct inet6_ifaddr * ifp;
2046         struct in6_addr addr;
2047         struct net_device *dev;
2048         int scope;
2049
2050         ASSERT_RTNL();
2051
2052         memset(&addr, 0, sizeof(struct in6_addr));
2053         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2054
2055         if (idev->dev->flags&IFF_POINTOPOINT) {
2056                 addr.s6_addr32[0] = htonl(0xfe800000);
2057                 scope = IFA_LINK;
2058         } else {
2059                 scope = IPV6_ADDR_COMPATv4;
2060         }
2061
2062         if (addr.s6_addr32[3]) {
2063                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2064                 if (!IS_ERR(ifp)) {
2065                         spin_lock_bh(&ifp->lock);
2066                         ifp->flags &= ~IFA_F_TENTATIVE;
2067                         spin_unlock_bh(&ifp->lock);
2068                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2069                         in6_ifa_put(ifp);
2070                 }
2071                 return;
2072         }
2073
2074         for_each_netdev(&init_net, dev) {
2075                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2076                 if (in_dev && (dev->flags & IFF_UP)) {
2077                         struct in_ifaddr * ifa;
2078
2079                         int flag = scope;
2080
2081                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2082                                 int plen;
2083
2084                                 addr.s6_addr32[3] = ifa->ifa_local;
2085
2086                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2087                                         continue;
2088                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2089                                         if (idev->dev->flags&IFF_POINTOPOINT)
2090                                                 continue;
2091                                         flag |= IFA_HOST;
2092                                 }
2093                                 if (idev->dev->flags&IFF_POINTOPOINT)
2094                                         plen = 64;
2095                                 else
2096                                         plen = 96;
2097
2098                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2099                                                     IFA_F_PERMANENT);
2100                                 if (!IS_ERR(ifp)) {
2101                                         spin_lock_bh(&ifp->lock);
2102                                         ifp->flags &= ~IFA_F_TENTATIVE;
2103                                         spin_unlock_bh(&ifp->lock);
2104                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2105                                         in6_ifa_put(ifp);
2106                                 }
2107                         }
2108                 }
2109         }
2110 }
2111 #endif
2112
2113 static void init_loopback(struct net_device *dev)
2114 {
2115         struct inet6_dev  *idev;
2116         struct inet6_ifaddr * ifp;
2117
2118         /* ::1 */
2119
2120         ASSERT_RTNL();
2121
2122         if ((idev = ipv6_find_idev(dev)) == NULL) {
2123                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2124                 return;
2125         }
2126
2127         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2128         if (!IS_ERR(ifp)) {
2129                 spin_lock_bh(&ifp->lock);
2130                 ifp->flags &= ~IFA_F_TENTATIVE;
2131                 spin_unlock_bh(&ifp->lock);
2132                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2133                 in6_ifa_put(ifp);
2134         }
2135 }
2136
2137 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2138 {
2139         struct inet6_ifaddr * ifp;
2140         u32 addr_flags = IFA_F_PERMANENT;
2141
2142 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2143         if (idev->cnf.optimistic_dad &&
2144             !ipv6_devconf.forwarding)
2145                 addr_flags |= IFA_F_OPTIMISTIC;
2146 #endif
2147
2148
2149         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2150         if (!IS_ERR(ifp)) {
2151                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2152                 addrconf_dad_start(ifp, 0);
2153                 in6_ifa_put(ifp);
2154         }
2155 }
2156
2157 static void addrconf_dev_config(struct net_device *dev)
2158 {
2159         struct in6_addr addr;
2160         struct inet6_dev    * idev;
2161
2162         ASSERT_RTNL();
2163
2164         if ((dev->type != ARPHRD_ETHER) &&
2165             (dev->type != ARPHRD_FDDI) &&
2166             (dev->type != ARPHRD_IEEE802_TR) &&
2167             (dev->type != ARPHRD_ARCNET) &&
2168             (dev->type != ARPHRD_INFINIBAND)) {
2169                 /* Alas, we support only Ethernet autoconfiguration. */
2170                 return;
2171         }
2172
2173         idev = addrconf_add_dev(dev);
2174         if (idev == NULL)
2175                 return;
2176
2177         memset(&addr, 0, sizeof(struct in6_addr));
2178         addr.s6_addr32[0] = htonl(0xFE800000);
2179
2180         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2181                 addrconf_add_linklocal(idev, &addr);
2182 }
2183
2184 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2185 static void addrconf_sit_config(struct net_device *dev)
2186 {
2187         struct inet6_dev *idev;
2188
2189         ASSERT_RTNL();
2190
2191         /*
2192          * Configure the tunnel with one of our IPv4
2193          * addresses... we should configure all of
2194          * our v4 addrs in the tunnel
2195          */
2196
2197         if ((idev = ipv6_find_idev(dev)) == NULL) {
2198                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2199                 return;
2200         }
2201
2202         sit_add_v4_addrs(idev);
2203
2204         if (dev->flags&IFF_POINTOPOINT) {
2205                 addrconf_add_mroute(dev);
2206                 addrconf_add_lroute(dev);
2207         } else
2208                 sit_route_add(dev);
2209 }
2210 #endif
2211
2212 static inline int
2213 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2214 {
2215         struct in6_addr lladdr;
2216
2217         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2218                 addrconf_add_linklocal(idev, &lladdr);
2219                 return 0;
2220         }
2221         return -1;
2222 }
2223
2224 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2225 {
2226         struct net_device *link_dev;
2227
2228         /* first try to inherit the link-local address from the link device */
2229         if (idev->dev->iflink &&
2230             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2231                 if (!ipv6_inherit_linklocal(idev, link_dev))
2232                         return;
2233         }
2234         /* then try to inherit it from any device */
2235         for_each_netdev(&init_net, link_dev) {
2236                 if (!ipv6_inherit_linklocal(idev, link_dev))
2237                         return;
2238         }
2239         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2240 }
2241
2242 /*
2243  * Autoconfigure tunnel with a link-local address so routing protocols,
2244  * DHCPv6, MLD etc. can be run over the virtual link
2245  */
2246
2247 static void addrconf_ip6_tnl_config(struct net_device *dev)
2248 {
2249         struct inet6_dev *idev;
2250
2251         ASSERT_RTNL();
2252
2253         if ((idev = addrconf_add_dev(dev)) == NULL) {
2254                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2255                 return;
2256         }
2257         ip6_tnl_add_linklocal(idev);
2258 }
2259
2260 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2261                            void * data)
2262 {
2263         struct net_device *dev = (struct net_device *) data;
2264         struct inet6_dev *idev = __in6_dev_get(dev);
2265         int run_pending = 0;
2266         int err;
2267
2268         if (dev->nd_net != &init_net)
2269                 return NOTIFY_DONE;
2270
2271         switch(event) {
2272         case NETDEV_REGISTER:
2273                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2274                         idev = ipv6_add_dev(dev);
2275                         if (!idev)
2276                                 return notifier_from_errno(-ENOMEM);
2277                 }
2278                 break;
2279         case NETDEV_UP:
2280         case NETDEV_CHANGE:
2281                 if (dev->flags & IFF_SLAVE)
2282                         break;
2283
2284                 if (event == NETDEV_UP) {
2285                         if (!addrconf_qdisc_ok(dev)) {
2286                                 /* device is not ready yet. */
2287                                 printk(KERN_INFO
2288                                         "ADDRCONF(NETDEV_UP): %s: "
2289                                         "link is not ready\n",
2290                                         dev->name);
2291                                 break;
2292                         }
2293
2294                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2295                                 idev = ipv6_add_dev(dev);
2296
2297                         if (idev)
2298                                 idev->if_flags |= IF_READY;
2299                 } else {
2300                         if (!addrconf_qdisc_ok(dev)) {
2301                                 /* device is still not ready. */
2302                                 break;
2303                         }
2304
2305                         if (idev) {
2306                                 if (idev->if_flags & IF_READY) {
2307                                         /* device is already configured. */
2308                                         break;
2309                                 }
2310                                 idev->if_flags |= IF_READY;
2311                         }
2312
2313                         printk(KERN_INFO
2314                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2315                                         "link becomes ready\n",
2316                                         dev->name);
2317
2318                         run_pending = 1;
2319                 }
2320
2321                 switch(dev->type) {
2322 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2323                 case ARPHRD_SIT:
2324                         addrconf_sit_config(dev);
2325                         break;
2326 #endif
2327                 case ARPHRD_TUNNEL6:
2328                         addrconf_ip6_tnl_config(dev);
2329                         break;
2330                 case ARPHRD_LOOPBACK:
2331                         init_loopback(dev);
2332                         break;
2333
2334                 default:
2335                         addrconf_dev_config(dev);
2336                         break;
2337                 }
2338                 if (idev) {
2339                         if (run_pending)
2340                                 addrconf_dad_run(idev);
2341
2342                         /* If the MTU changed during the interface down, when the
2343                            interface up, the changed MTU must be reflected in the
2344                            idev as well as routers.
2345                          */
2346                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2347                                 rt6_mtu_change(dev, dev->mtu);
2348                                 idev->cnf.mtu6 = dev->mtu;
2349                         }
2350                         idev->tstamp = jiffies;
2351                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2352                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2353                            stop IPv6 on this interface.
2354                          */
2355                         if (dev->mtu < IPV6_MIN_MTU)
2356                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2357                 }
2358                 break;
2359
2360         case NETDEV_CHANGEMTU:
2361                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2362                         rt6_mtu_change(dev, dev->mtu);
2363                         idev->cnf.mtu6 = dev->mtu;
2364                         break;
2365                 }
2366
2367                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2368                         idev = ipv6_add_dev(dev);
2369                         if (idev)
2370                                 break;
2371                 }
2372
2373                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2374
2375         case NETDEV_DOWN:
2376         case NETDEV_UNREGISTER:
2377                 /*
2378                  *      Remove all addresses from this interface.
2379                  */
2380                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2381                 break;
2382
2383         case NETDEV_CHANGENAME:
2384                 if (idev) {
2385                         snmp6_unregister_dev(idev);
2386 #ifdef CONFIG_SYSCTL
2387                         addrconf_sysctl_unregister(&idev->cnf);
2388                         neigh_sysctl_unregister(idev->nd_parms);
2389                         neigh_sysctl_register(dev, idev->nd_parms,
2390                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2391                                               &ndisc_ifinfo_sysctl_change,
2392                                               NULL);
2393                         addrconf_sysctl_register(idev, &idev->cnf);
2394 #endif
2395                         err = snmp6_register_dev(idev);
2396                         if (err)
2397                                 return notifier_from_errno(err);
2398                 }
2399                 break;
2400         }
2401
2402         return NOTIFY_OK;
2403 }
2404
2405 /*
2406  *      addrconf module should be notified of a device going up
2407  */
2408 static struct notifier_block ipv6_dev_notf = {
2409         .notifier_call = addrconf_notify,
2410         .priority = 0
2411 };
2412
2413 static int addrconf_ifdown(struct net_device *dev, int how)
2414 {
2415         struct inet6_dev *idev;
2416         struct inet6_ifaddr *ifa, **bifa;
2417         int i;
2418
2419         ASSERT_RTNL();
2420
2421         if (dev == init_net.loopback_dev && how == 1)
2422                 how = 0;
2423
2424         rt6_ifdown(dev);
2425         neigh_ifdown(&nd_tbl, dev);
2426
2427         idev = __in6_dev_get(dev);
2428         if (idev == NULL)
2429                 return -ENODEV;
2430
2431         /* Step 1: remove reference to ipv6 device from parent device.
2432                    Do not dev_put!
2433          */
2434         if (how == 1) {
2435                 idev->dead = 1;
2436
2437                 /* protected by rtnl_lock */
2438                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2439
2440                 /* Step 1.5: remove snmp6 entry */
2441                 snmp6_unregister_dev(idev);
2442
2443         }
2444
2445         /* Step 2: clear hash table */
2446         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2447                 bifa = &inet6_addr_lst[i];
2448
2449                 write_lock_bh(&addrconf_hash_lock);
2450                 while ((ifa = *bifa) != NULL) {
2451                         if (ifa->idev == idev) {
2452                                 *bifa = ifa->lst_next;
2453                                 ifa->lst_next = NULL;
2454                                 addrconf_del_timer(ifa);
2455                                 in6_ifa_put(ifa);
2456                                 continue;
2457                         }
2458                         bifa = &ifa->lst_next;
2459                 }
2460                 write_unlock_bh(&addrconf_hash_lock);
2461         }
2462
2463         write_lock_bh(&idev->lock);
2464
2465         /* Step 3: clear flags for stateless addrconf */
2466         if (how != 1)
2467                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2468
2469         /* Step 4: clear address list */
2470 #ifdef CONFIG_IPV6_PRIVACY
2471         if (how == 1 && del_timer(&idev->regen_timer))
2472                 in6_dev_put(idev);
2473
2474         /* clear tempaddr list */
2475         while ((ifa = idev->tempaddr_list) != NULL) {
2476                 idev->tempaddr_list = ifa->tmp_next;
2477                 ifa->tmp_next = NULL;
2478                 ifa->dead = 1;
2479                 write_unlock_bh(&idev->lock);
2480                 spin_lock_bh(&ifa->lock);
2481
2482                 if (ifa->ifpub) {
2483                         in6_ifa_put(ifa->ifpub);
2484                         ifa->ifpub = NULL;
2485                 }
2486                 spin_unlock_bh(&ifa->lock);
2487                 in6_ifa_put(ifa);
2488                 write_lock_bh(&idev->lock);
2489         }
2490 #endif
2491         while ((ifa = idev->addr_list) != NULL) {
2492                 idev->addr_list = ifa->if_next;
2493                 ifa->if_next = NULL;
2494                 ifa->dead = 1;
2495                 addrconf_del_timer(ifa);
2496                 write_unlock_bh(&idev->lock);
2497
2498                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2499                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2500                 in6_ifa_put(ifa);
2501
2502                 write_lock_bh(&idev->lock);
2503         }
2504         write_unlock_bh(&idev->lock);
2505
2506         /* Step 5: Discard multicast list */
2507
2508         if (how == 1)
2509                 ipv6_mc_destroy_dev(idev);
2510         else
2511                 ipv6_mc_down(idev);
2512
2513         idev->tstamp = jiffies;
2514
2515         /* Shot the device (if unregistered) */
2516
2517         if (how == 1) {
2518 #ifdef CONFIG_SYSCTL
2519                 addrconf_sysctl_unregister(&idev->cnf);
2520                 neigh_sysctl_unregister(idev->nd_parms);
2521 #endif
2522                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2523                 neigh_ifdown(&nd_tbl, dev);
2524                 in6_dev_put(idev);
2525         }
2526         return 0;
2527 }
2528
2529 static void addrconf_rs_timer(unsigned long data)
2530 {
2531         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2532
2533         if (ifp->idev->cnf.forwarding)
2534                 goto out;
2535
2536         if (ifp->idev->if_flags & IF_RA_RCVD) {
2537                 /*
2538                  *      Announcement received after solicitation
2539                  *      was sent
2540                  */
2541                 goto out;
2542         }
2543
2544         spin_lock(&ifp->lock);
2545         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2546                 struct in6_addr all_routers;
2547
2548                 /* The wait after the last probe can be shorter */
2549                 addrconf_mod_timer(ifp, AC_RS,
2550                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2551                                    ifp->idev->cnf.rtr_solicit_delay :
2552                                    ifp->idev->cnf.rtr_solicit_interval);
2553                 spin_unlock(&ifp->lock);
2554
2555                 ipv6_addr_all_routers(&all_routers);
2556
2557                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2558         } else {
2559                 spin_unlock(&ifp->lock);
2560                 /*
2561                  * Note: we do not support deprecated "all on-link"
2562                  * assumption any longer.
2563                  */
2564                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2565                        ifp->idev->dev->name);
2566         }
2567
2568 out:
2569         in6_ifa_put(ifp);
2570 }
2571
2572 /*
2573  *      Duplicate Address Detection
2574  */
2575 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2576 {
2577         unsigned long rand_num;
2578         struct inet6_dev *idev = ifp->idev;
2579
2580         if (ifp->flags & IFA_F_OPTIMISTIC)
2581                 rand_num = 0;
2582         else
2583                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2584
2585         ifp->probes = idev->cnf.dad_transmits;
2586         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2587 }
2588
2589 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2590 {
2591         struct inet6_dev *idev = ifp->idev;
2592         struct net_device *dev = idev->dev;
2593
2594         addrconf_join_solict(dev, &ifp->addr);
2595
2596         net_srandom(ifp->addr.s6_addr32[3]);
2597
2598         read_lock_bh(&idev->lock);
2599         if (ifp->dead)
2600                 goto out;
2601         spin_lock_bh(&ifp->lock);
2602
2603         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2604             !(ifp->flags&IFA_F_TENTATIVE) ||
2605             ifp->flags & IFA_F_NODAD) {
2606                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2607                 spin_unlock_bh(&ifp->lock);
2608                 read_unlock_bh(&idev->lock);
2609
2610                 addrconf_dad_completed(ifp);
2611                 return;
2612         }
2613
2614         if (!(idev->if_flags & IF_READY)) {
2615                 spin_unlock_bh(&ifp->lock);
2616                 read_unlock_bh(&idev->lock);
2617                 /*
2618                  * If the defice is not ready:
2619                  * - keep it tentative if it is a permanent address.
2620                  * - otherwise, kill it.
2621                  */
2622                 in6_ifa_hold(ifp);
2623                 addrconf_dad_stop(ifp);
2624                 return;
2625         }
2626
2627         /*
2628          * Optimistic nodes can start receiving
2629          * Frames right away
2630          */
2631         if(ifp->flags & IFA_F_OPTIMISTIC)
2632                 ip6_ins_rt(ifp->rt);
2633
2634         addrconf_dad_kick(ifp);
2635         spin_unlock_bh(&ifp->lock);
2636 out:
2637         read_unlock_bh(&idev->lock);
2638 }
2639
2640 static void addrconf_dad_timer(unsigned long data)
2641 {
2642         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2643         struct inet6_dev *idev = ifp->idev;
2644         struct in6_addr unspec;
2645         struct in6_addr mcaddr;
2646
2647         read_lock_bh(&idev->lock);
2648         if (idev->dead) {
2649                 read_unlock_bh(&idev->lock);
2650                 goto out;
2651         }
2652         spin_lock_bh(&ifp->lock);
2653         if (ifp->probes == 0) {
2654                 /*
2655                  * DAD was successful
2656                  */
2657
2658                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2659                 spin_unlock_bh(&ifp->lock);
2660                 read_unlock_bh(&idev->lock);
2661
2662                 addrconf_dad_completed(ifp);
2663
2664                 goto out;
2665         }
2666
2667         ifp->probes--;
2668         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2669         spin_unlock_bh(&ifp->lock);
2670         read_unlock_bh(&idev->lock);
2671
2672         /* send a neighbour solicitation for our addr */
2673         memset(&unspec, 0, sizeof(unspec));
2674         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2675         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2676 out:
2677         in6_ifa_put(ifp);
2678 }
2679
2680 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2681 {
2682         struct net_device *     dev = ifp->idev->dev;
2683
2684         /*
2685          *      Configure the address for reception. Now it is valid.
2686          */
2687
2688         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2689
2690         /* If added prefix is link local and forwarding is off,
2691            start sending router solicitations.
2692          */
2693
2694         if (ifp->idev->cnf.forwarding == 0 &&
2695             ifp->idev->cnf.rtr_solicits > 0 &&
2696             (dev->flags&IFF_LOOPBACK) == 0 &&
2697             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2698                 struct in6_addr all_routers;
2699
2700                 ipv6_addr_all_routers(&all_routers);
2701
2702                 /*
2703                  *      If a host as already performed a random delay
2704                  *      [...] as part of DAD [...] there is no need
2705                  *      to delay again before sending the first RS
2706                  */
2707                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2708
2709                 spin_lock_bh(&ifp->lock);
2710                 ifp->probes = 1;
2711                 ifp->idev->if_flags |= IF_RS_SENT;
2712                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2713                 spin_unlock_bh(&ifp->lock);
2714         }
2715 }
2716
2717 static void addrconf_dad_run(struct inet6_dev *idev) {
2718         struct inet6_ifaddr *ifp;
2719
2720         read_lock_bh(&idev->lock);
2721         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2722                 spin_lock_bh(&ifp->lock);
2723                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2724                         spin_unlock_bh(&ifp->lock);
2725                         continue;
2726                 }
2727                 spin_unlock_bh(&ifp->lock);
2728                 addrconf_dad_kick(ifp);
2729         }
2730         read_unlock_bh(&idev->lock);
2731 }
2732
2733 #ifdef CONFIG_PROC_FS
2734 struct if6_iter_state {
2735         int bucket;
2736 };
2737
2738 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2739 {
2740         struct inet6_ifaddr *ifa = NULL;
2741         struct if6_iter_state *state = seq->private;
2742
2743         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2744                 ifa = inet6_addr_lst[state->bucket];
2745                 if (ifa)
2746                         break;
2747         }
2748         return ifa;
2749 }
2750
2751 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2752 {
2753         struct if6_iter_state *state = seq->private;
2754
2755         ifa = ifa->lst_next;
2756 try_again:
2757         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2758                 ifa = inet6_addr_lst[state->bucket];
2759                 goto try_again;
2760         }
2761         return ifa;
2762 }
2763
2764 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2765 {
2766         struct inet6_ifaddr *ifa = if6_get_first(seq);
2767
2768         if (ifa)
2769                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2770                         --pos;
2771         return pos ? NULL : ifa;
2772 }
2773
2774 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2775 {
2776         read_lock_bh(&addrconf_hash_lock);
2777         return if6_get_idx(seq, *pos);
2778 }
2779
2780 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2781 {
2782         struct inet6_ifaddr *ifa;
2783
2784         ifa = if6_get_next(seq, v);
2785         ++*pos;
2786         return ifa;
2787 }
2788
2789 static void if6_seq_stop(struct seq_file *seq, void *v)
2790 {
2791         read_unlock_bh(&addrconf_hash_lock);
2792 }
2793
2794 static int if6_seq_show(struct seq_file *seq, void *v)
2795 {
2796         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2797         seq_printf(seq,
2798                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2799                    NIP6(ifp->addr),
2800                    ifp->idev->dev->ifindex,
2801                    ifp->prefix_len,
2802                    ifp->scope,
2803                    ifp->flags,
2804                    ifp->idev->dev->name);
2805         return 0;
2806 }
2807
2808 static const struct seq_operations if6_seq_ops = {
2809         .start  = if6_seq_start,
2810         .next   = if6_seq_next,
2811         .show   = if6_seq_show,
2812         .stop   = if6_seq_stop,
2813 };
2814
2815 static int if6_seq_open(struct inode *inode, struct file *file)
2816 {
2817         return seq_open_private(file, &if6_seq_ops,
2818                         sizeof(struct if6_iter_state));
2819 }
2820
2821 static const struct file_operations if6_fops = {
2822         .owner          = THIS_MODULE,
2823         .open           = if6_seq_open,
2824         .read           = seq_read,
2825         .llseek         = seq_lseek,
2826         .release        = seq_release_private,
2827 };
2828
2829 int __init if6_proc_init(void)
2830 {
2831         if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2832                 return -ENOMEM;
2833         return 0;
2834 }
2835
2836 void if6_proc_exit(void)
2837 {
2838         proc_net_remove(&init_net, "if_inet6");
2839 }
2840 #endif  /* CONFIG_PROC_FS */
2841
2842 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2843 /* Check if address is a home address configured on any interface. */
2844 int ipv6_chk_home_addr(struct in6_addr *addr)
2845 {
2846         int ret = 0;
2847         struct inet6_ifaddr * ifp;
2848         u8 hash = ipv6_addr_hash(addr);
2849         read_lock_bh(&addrconf_hash_lock);
2850         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2851                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2852                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2853                         ret = 1;
2854                         break;
2855                 }
2856         }
2857         read_unlock_bh(&addrconf_hash_lock);
2858         return ret;
2859 }
2860 #endif
2861
2862 /*
2863  *      Periodic address status verification
2864  */
2865
2866 static void addrconf_verify(unsigned long foo)
2867 {
2868         struct inet6_ifaddr *ifp;
2869         unsigned long now, next;
2870         int i;
2871
2872         spin_lock_bh(&addrconf_verify_lock);
2873         now = jiffies;
2874         next = now + ADDR_CHECK_FREQUENCY;
2875
2876         del_timer(&addr_chk_timer);
2877
2878         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2879
2880 restart:
2881                 read_lock(&addrconf_hash_lock);
2882                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2883                         unsigned long age;
2884 #ifdef CONFIG_IPV6_PRIVACY
2885                         unsigned long regen_advance;
2886 #endif
2887
2888                         if (ifp->flags & IFA_F_PERMANENT)
2889                                 continue;
2890
2891                         spin_lock(&ifp->lock);
2892                         age = (now - ifp->tstamp) / HZ;
2893
2894 #ifdef CONFIG_IPV6_PRIVACY
2895                         regen_advance = ifp->idev->cnf.regen_max_retry *
2896                                         ifp->idev->cnf.dad_transmits *
2897                                         ifp->idev->nd_parms->retrans_time / HZ;
2898 #endif
2899
2900                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2901                             age >= ifp->valid_lft) {
2902                                 spin_unlock(&ifp->lock);
2903                                 in6_ifa_hold(ifp);
2904                                 read_unlock(&addrconf_hash_lock);
2905                                 ipv6_del_addr(ifp);
2906                                 goto restart;
2907                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2908                                 spin_unlock(&ifp->lock);
2909                                 continue;
2910                         } else if (age >= ifp->prefered_lft) {
2911                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2912                                 int deprecate = 0;
2913
2914                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2915                                         deprecate = 1;
2916                                         ifp->flags |= IFA_F_DEPRECATED;
2917                                 }
2918
2919                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2920                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2921
2922                                 spin_unlock(&ifp->lock);
2923
2924                                 if (deprecate) {
2925                                         in6_ifa_hold(ifp);
2926                                         read_unlock(&addrconf_hash_lock);
2927
2928                                         ipv6_ifa_notify(0, ifp);
2929                                         in6_ifa_put(ifp);
2930                                         goto restart;
2931                                 }
2932 #ifdef CONFIG_IPV6_PRIVACY
2933                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2934                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2935                                 if (age >= ifp->prefered_lft - regen_advance) {
2936                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2937                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2938                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2939                                         if (!ifp->regen_count && ifpub) {
2940                                                 ifp->regen_count++;
2941                                                 in6_ifa_hold(ifp);
2942                                                 in6_ifa_hold(ifpub);
2943                                                 spin_unlock(&ifp->lock);
2944                                                 read_unlock(&addrconf_hash_lock);
2945                                                 spin_lock(&ifpub->lock);
2946                                                 ifpub->regen_count = 0;
2947                                                 spin_unlock(&ifpub->lock);
2948                                                 ipv6_create_tempaddr(ifpub, ifp);
2949                                                 in6_ifa_put(ifpub);
2950                                                 in6_ifa_put(ifp);
2951                                                 goto restart;
2952                                         }
2953                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2954                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2955                                 spin_unlock(&ifp->lock);
2956 #endif
2957                         } else {
2958                                 /* ifp->prefered_lft <= ifp->valid_lft */
2959                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2960                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2961                                 spin_unlock(&ifp->lock);
2962                         }
2963                 }
2964                 read_unlock(&addrconf_hash_lock);
2965         }
2966
2967         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2968         add_timer(&addr_chk_timer);
2969         spin_unlock_bh(&addrconf_verify_lock);
2970 }
2971
2972 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2973 {
2974         struct in6_addr *pfx = NULL;
2975
2976         if (addr)
2977                 pfx = nla_data(addr);
2978
2979         if (local) {
2980                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2981                         pfx = NULL;
2982                 else
2983                         pfx = nla_data(local);
2984         }
2985
2986         return pfx;
2987 }
2988
2989 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2990         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2991         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2992         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2993 };
2994
2995 static int
2996 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2997 {
2998         struct ifaddrmsg *ifm;
2999         struct nlattr *tb[IFA_MAX+1];
3000         struct in6_addr *pfx;
3001         int err;
3002
3003         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3004         if (err < 0)
3005                 return err;
3006
3007         ifm = nlmsg_data(nlh);
3008         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3009         if (pfx == NULL)
3010                 return -EINVAL;
3011
3012         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3013 }
3014
3015 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3016                              u32 prefered_lft, u32 valid_lft)
3017 {
3018         u32 flags = RTF_EXPIRES;
3019
3020         if (!valid_lft || (prefered_lft > valid_lft))
3021                 return -EINVAL;
3022
3023         if (valid_lft == INFINITY_LIFE_TIME) {
3024                 ifa_flags |= IFA_F_PERMANENT;
3025                 flags = 0;
3026         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3027                 valid_lft = 0x7FFFFFFF/HZ;
3028
3029         if (prefered_lft == 0)
3030                 ifa_flags |= IFA_F_DEPRECATED;
3031         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3032                  (prefered_lft != INFINITY_LIFE_TIME))
3033                 prefered_lft = 0x7FFFFFFF/HZ;
3034
3035         spin_lock_bh(&ifp->lock);
3036         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3037         ifp->tstamp = jiffies;
3038         ifp->valid_lft = valid_lft;
3039         ifp->prefered_lft = prefered_lft;
3040
3041         spin_unlock_bh(&ifp->lock);
3042         if (!(ifp->flags&IFA_F_TENTATIVE))
3043                 ipv6_ifa_notify(0, ifp);
3044
3045         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3046                               jiffies_to_clock_t(valid_lft * HZ), flags);
3047         addrconf_verify(0);
3048
3049         return 0;
3050 }
3051
3052 static int
3053 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3054 {
3055         struct ifaddrmsg *ifm;
3056         struct nlattr *tb[IFA_MAX+1];
3057         struct in6_addr *pfx;
3058         struct inet6_ifaddr *ifa;
3059         struct net_device *dev;
3060         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3061         u8 ifa_flags;
3062         int err;
3063
3064         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3065         if (err < 0)
3066                 return err;
3067
3068         ifm = nlmsg_data(nlh);
3069         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3070         if (pfx == NULL)
3071                 return -EINVAL;
3072
3073         if (tb[IFA_CACHEINFO]) {
3074                 struct ifa_cacheinfo *ci;
3075
3076                 ci = nla_data(tb[IFA_CACHEINFO]);
3077                 valid_lft = ci->ifa_valid;
3078                 preferred_lft = ci->ifa_prefered;
3079         } else {
3080                 preferred_lft = INFINITY_LIFE_TIME;
3081                 valid_lft = INFINITY_LIFE_TIME;
3082         }
3083
3084         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3085         if (dev == NULL)
3086                 return -ENODEV;
3087
3088         /* We ignore other flags so far. */
3089         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3090
3091         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3092         if (ifa == NULL) {
3093                 /*
3094                  * It would be best to check for !NLM_F_CREATE here but
3095                  * userspace alreay relies on not having to provide this.
3096                  */
3097                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3098                                       ifa_flags, preferred_lft, valid_lft);
3099         }
3100
3101         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3102             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3103                 err = -EEXIST;
3104         else
3105                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3106
3107         in6_ifa_put(ifa);
3108
3109         return err;
3110 }
3111
3112 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3113                           u8 scope, int ifindex)
3114 {
3115         struct ifaddrmsg *ifm;
3116
3117         ifm = nlmsg_data(nlh);
3118         ifm->ifa_family = AF_INET6;
3119         ifm->ifa_prefixlen = prefixlen;
3120         ifm->ifa_flags = flags;
3121         ifm->ifa_scope = scope;
3122         ifm->ifa_index = ifindex;
3123 }
3124
3125 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3126                          unsigned long tstamp, u32 preferred, u32 valid)
3127 {
3128         struct ifa_cacheinfo ci;
3129
3130         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3131                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3132         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3133                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3134         ci.ifa_prefered = preferred;
3135         ci.ifa_valid = valid;
3136
3137         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3138 }
3139
3140 static inline int rt_scope(int ifa_scope)
3141 {
3142         if (ifa_scope & IFA_HOST)
3143                 return RT_SCOPE_HOST;
3144         else if (ifa_scope & IFA_LINK)
3145                 return RT_SCOPE_LINK;
3146         else if (ifa_scope & IFA_SITE)
3147                 return RT_SCOPE_SITE;
3148         else
3149                 return RT_SCOPE_UNIVERSE;
3150 }
3151
3152 static inline int inet6_ifaddr_msgsize(void)
3153 {
3154         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3155                + nla_total_size(16) /* IFA_ADDRESS */
3156                + nla_total_size(sizeof(struct ifa_cacheinfo));
3157 }
3158
3159 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3160                              u32 pid, u32 seq, int event, unsigned int flags)
3161 {
3162         struct nlmsghdr  *nlh;
3163         u32 preferred, valid;
3164
3165         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3166         if (nlh == NULL)
3167                 return -EMSGSIZE;
3168
3169         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3170                       ifa->idev->dev->ifindex);
3171
3172         if (!(ifa->flags&IFA_F_PERMANENT)) {
3173                 preferred = ifa->prefered_lft;
3174                 valid = ifa->valid_lft;
3175                 if (preferred != INFINITY_LIFE_TIME) {
3176                         long tval = (jiffies - ifa->tstamp)/HZ;
3177                         preferred -= tval;
3178                         if (valid != INFINITY_LIFE_TIME)
3179                                 valid -= tval;
3180                 }
3181         } else {
3182                 preferred = INFINITY_LIFE_TIME;
3183                 valid = INFINITY_LIFE_TIME;
3184         }
3185
3186         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3187             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3188                 nlmsg_cancel(skb, nlh);
3189                 return -EMSGSIZE;
3190         }
3191
3192         return nlmsg_end(skb, nlh);
3193 }
3194
3195 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3196                                 u32 pid, u32 seq, int event, u16 flags)
3197 {
3198         struct nlmsghdr  *nlh;
3199         u8 scope = RT_SCOPE_UNIVERSE;
3200         int ifindex = ifmca->idev->dev->ifindex;
3201
3202         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3203                 scope = RT_SCOPE_SITE;
3204
3205         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3206         if (nlh == NULL)
3207                 return -EMSGSIZE;
3208
3209         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3210         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3211             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3212                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3213                 nlmsg_cancel(skb, nlh);
3214                 return -EMSGSIZE;
3215         }
3216
3217         return nlmsg_end(skb, nlh);
3218 }
3219
3220 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3221                                 u32 pid, u32 seq, int event, unsigned int flags)
3222 {
3223         struct nlmsghdr  *nlh;
3224         u8 scope = RT_SCOPE_UNIVERSE;
3225         int ifindex = ifaca->aca_idev->dev->ifindex;
3226
3227         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3228                 scope = RT_SCOPE_SITE;
3229
3230         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3231         if (nlh == NULL)
3232                 return -EMSGSIZE;
3233
3234         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3235         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3236             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3237                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3238                 nlmsg_cancel(skb, nlh);
3239                 return -EMSGSIZE;
3240         }
3241
3242         return nlmsg_end(skb, nlh);
3243 }
3244
3245 enum addr_type_t
3246 {
3247         UNICAST_ADDR,
3248         MULTICAST_ADDR,
3249         ANYCAST_ADDR,
3250 };
3251
3252 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3253                            enum addr_type_t type)
3254 {
3255         int idx, ip_idx;
3256         int s_idx, s_ip_idx;
3257         int err = 1;
3258         struct net_device *dev;
3259         struct inet6_dev *idev = NULL;
3260         struct inet6_ifaddr *ifa;
3261         struct ifmcaddr6 *ifmca;
3262         struct ifacaddr6 *ifaca;
3263
3264         s_idx = cb->args[0];
3265         s_ip_idx = ip_idx = cb->args[1];
3266
3267         idx = 0;
3268         for_each_netdev(&init_net, dev) {
3269                 if (idx < s_idx)
3270                         goto cont;
3271                 if (idx > s_idx)
3272                         s_ip_idx = 0;
3273                 ip_idx = 0;
3274                 if ((idev = in6_dev_get(dev)) == NULL)
3275                         goto cont;
3276                 read_lock_bh(&idev->lock);
3277                 switch (type) {
3278                 case UNICAST_ADDR:
3279                         /* unicast address incl. temp addr */
3280                         for (ifa = idev->addr_list; ifa;
3281                              ifa = ifa->if_next, ip_idx++) {
3282                                 if (ip_idx < s_ip_idx)
3283                                         continue;
3284                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3285                                     NETLINK_CB(cb->skb).pid,
3286                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3287                                     NLM_F_MULTI)) <= 0)
3288                                         goto done;
3289                         }
3290                         break;
3291                 case MULTICAST_ADDR:
3292                         /* multicast address */
3293                         for (ifmca = idev->mc_list; ifmca;
3294                              ifmca = ifmca->next, ip_idx++) {
3295                                 if (ip_idx < s_ip_idx)
3296                                         continue;
3297                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3298                                     NETLINK_CB(cb->skb).pid,
3299                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3300                                     NLM_F_MULTI)) <= 0)
3301                                         goto done;
3302                         }
3303                         break;
3304                 case ANYCAST_ADDR:
3305                         /* anycast address */
3306                         for (ifaca = idev->ac_list; ifaca;
3307                              ifaca = ifaca->aca_next, ip_idx++) {
3308                                 if (ip_idx < s_ip_idx)
3309                                         continue;
3310                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3311                                     NETLINK_CB(cb->skb).pid,
3312                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3313                                     NLM_F_MULTI)) <= 0)
3314                                         goto done;
3315                         }
3316                         break;
3317                 default:
3318                         break;
3319                 }
3320                 read_unlock_bh(&idev->lock);
3321                 in6_dev_put(idev);
3322 cont:
3323                 idx++;
3324         }
3325 done:
3326         if (err <= 0) {
3327                 read_unlock_bh(&idev->lock);
3328                 in6_dev_put(idev);
3329         }
3330         cb->args[0] = idx;
3331         cb->args[1] = ip_idx;
3332         return skb->len;
3333 }
3334
3335 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3336 {
3337         enum addr_type_t type = UNICAST_ADDR;
3338         return inet6_dump_addr(skb, cb, type);
3339 }
3340
3341 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3342 {
3343         enum addr_type_t type = MULTICAST_ADDR;
3344         return inet6_dump_addr(skb, cb, type);
3345 }
3346
3347
3348 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3349 {
3350         enum addr_type_t type = ANYCAST_ADDR;
3351         return inet6_dump_addr(skb, cb, type);
3352 }
3353
3354 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3355                              void *arg)
3356 {
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         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3366         if (err < 0)
3367                 goto errout;
3368
3369         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3370         if (addr == NULL) {
3371                 err = -EINVAL;
3372                 goto errout;
3373         }
3374
3375         ifm = nlmsg_data(nlh);
3376         if (ifm->ifa_index)
3377                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3378
3379         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3380                 err = -EADDRNOTAVAIL;
3381                 goto errout;
3382         }
3383
3384         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3385                 err = -ENOBUFS;
3386                 goto errout_ifa;
3387         }
3388
3389         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3390                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3391         if (err < 0) {
3392                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3393                 WARN_ON(err == -EMSGSIZE);
3394                 kfree_skb(skb);
3395                 goto errout_ifa;
3396         }
3397         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3398 errout_ifa:
3399         in6_ifa_put(ifa);
3400 errout:
3401         return err;
3402 }
3403
3404 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3405 {
3406         struct sk_buff *skb;
3407         int err = -ENOBUFS;
3408
3409         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3410         if (skb == NULL)
3411                 goto errout;
3412
3413         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3414         if (err < 0) {
3415                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3416                 WARN_ON(err == -EMSGSIZE);
3417                 kfree_skb(skb);
3418                 goto errout;
3419         }
3420         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3421 errout:
3422         if (err < 0)
3423                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3424 }
3425
3426 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3427                                 __s32 *array, int bytes)
3428 {
3429         BUG_ON(bytes < (DEVCONF_MAX * 4));
3430
3431         memset(array, 0, bytes);
3432         array[DEVCONF_FORWARDING] = cnf->forwarding;
3433         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3434         array[DEVCONF_MTU6] = cnf->mtu6;
3435         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3436         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3437         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3438         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3439         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3440         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3441         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3442         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3443 #ifdef CONFIG_IPV6_PRIVACY
3444         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3445         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3446         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3447         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3448         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3449 #endif
3450         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3451         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3452         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3453 #ifdef CONFIG_IPV6_ROUTER_PREF
3454         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3455         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3456 #ifdef CONFIG_IPV6_ROUTE_INFO
3457         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3458 #endif
3459 #endif
3460         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3461         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3462 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3463         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3464 #endif
3465 }
3466
3467 static inline size_t inet6_if_nlmsg_size(void)
3468 {
3469         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3470                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3471                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3472                + nla_total_size(4) /* IFLA_MTU */
3473                + nla_total_size(4) /* IFLA_LINK */
3474                + nla_total_size( /* IFLA_PROTINFO */
3475                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3476                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3477                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3478                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3479                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3480                  );
3481 }
3482
3483 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3484                                       int bytes)
3485 {
3486         int i;
3487         int pad = bytes - sizeof(u64) * items;
3488         BUG_ON(pad < 0);
3489
3490         /* Use put_unaligned() because stats may not be aligned for u64. */
3491         put_unaligned(items, &stats[0]);
3492         for (i = 1; i < items; i++)
3493                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3494
3495         memset(&stats[items], 0, pad);
3496 }
3497
3498 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3499                              int bytes)
3500 {
3501         switch(attrtype) {
3502         case IFLA_INET6_STATS:
3503                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3504                 break;
3505         case IFLA_INET6_ICMP6STATS:
3506                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3507                 break;
3508         }
3509 }
3510
3511 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3512                              u32 pid, u32 seq, int event, unsigned int flags)
3513 {
3514         struct net_device *dev = idev->dev;
3515         struct nlattr *nla;
3516         struct ifinfomsg *hdr;
3517         struct nlmsghdr *nlh;
3518         void *protoinfo;
3519         struct ifla_cacheinfo ci;
3520
3521         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3522         if (nlh == NULL)
3523                 return -EMSGSIZE;
3524
3525         hdr = nlmsg_data(nlh);
3526         hdr->ifi_family = AF_INET6;
3527         hdr->__ifi_pad = 0;
3528         hdr->ifi_type = dev->type;
3529         hdr->ifi_index = dev->ifindex;
3530         hdr->ifi_flags = dev_get_flags(dev);
3531         hdr->ifi_change = 0;
3532
3533         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3534
3535         if (dev->addr_len)
3536                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3537
3538         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3539         if (dev->ifindex != dev->iflink)
3540                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3541
3542         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3543         if (protoinfo == NULL)
3544                 goto nla_put_failure;
3545
3546         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3547
3548         ci.max_reasm_len = IPV6_MAXPLEN;
3549         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3550                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3551         ci.reachable_time = idev->nd_parms->reachable_time;
3552         ci.retrans_time = idev->nd_parms->retrans_time;
3553         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3554
3555         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3556         if (nla == NULL)
3557                 goto nla_put_failure;
3558         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3559
3560         /* XXX - MC not implemented */
3561
3562         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3563         if (nla == NULL)
3564                 goto nla_put_failure;
3565         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3566
3567         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3568         if (nla == NULL)
3569                 goto nla_put_failure;
3570         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3571
3572         nla_nest_end(skb, protoinfo);
3573         return nlmsg_end(skb, nlh);
3574
3575 nla_put_failure:
3576         nlmsg_cancel(skb, nlh);
3577         return -EMSGSIZE;
3578 }
3579
3580 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3581 {
3582         int idx, err;
3583         int s_idx = cb->args[0];
3584         struct net_device *dev;
3585         struct inet6_dev *idev;
3586
3587         read_lock(&dev_base_lock);
3588         idx = 0;
3589         for_each_netdev(&init_net, dev) {
3590                 if (idx < s_idx)
3591                         goto cont;
3592                 if ((idev = in6_dev_get(dev)) == NULL)
3593                         goto cont;
3594                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3595                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3596                 in6_dev_put(idev);
3597                 if (err <= 0)
3598                         break;
3599 cont:
3600                 idx++;
3601         }
3602         read_unlock(&dev_base_lock);
3603         cb->args[0] = idx;
3604
3605         return skb->len;
3606 }
3607
3608 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3609 {
3610         struct sk_buff *skb;
3611         int err = -ENOBUFS;
3612
3613         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3614         if (skb == NULL)
3615                 goto errout;
3616
3617         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3618         if (err < 0) {
3619                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3620                 WARN_ON(err == -EMSGSIZE);
3621                 kfree_skb(skb);
3622                 goto errout;
3623         }
3624         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3625 errout:
3626         if (err < 0)
3627                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3628 }
3629
3630 static inline size_t inet6_prefix_nlmsg_size(void)
3631 {
3632         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3633                + nla_total_size(sizeof(struct in6_addr))
3634                + nla_total_size(sizeof(struct prefix_cacheinfo));
3635 }
3636
3637 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3638                              struct prefix_info *pinfo, u32 pid, u32 seq,
3639                              int event, unsigned int flags)
3640 {
3641         struct prefixmsg *pmsg;
3642         struct nlmsghdr *nlh;
3643         struct prefix_cacheinfo ci;
3644
3645         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3646         if (nlh == NULL)
3647                 return -EMSGSIZE;
3648
3649         pmsg = nlmsg_data(nlh);
3650         pmsg->prefix_family = AF_INET6;
3651         pmsg->prefix_pad1 = 0;
3652         pmsg->prefix_pad2 = 0;
3653         pmsg->prefix_ifindex = idev->dev->ifindex;
3654         pmsg->prefix_len = pinfo->prefix_len;
3655         pmsg->prefix_type = pinfo->type;
3656         pmsg->prefix_pad3 = 0;
3657         pmsg->prefix_flags = 0;
3658         if (pinfo->onlink)
3659                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3660         if (pinfo->autoconf)
3661                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3662
3663         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3664
3665         ci.preferred_time = ntohl(pinfo->prefered);
3666         ci.valid_time = ntohl(pinfo->valid);
3667         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3668
3669         return nlmsg_end(skb, nlh);
3670
3671 nla_put_failure:
3672         nlmsg_cancel(skb, nlh);
3673         return -EMSGSIZE;
3674 }
3675
3676 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3677                          struct prefix_info *pinfo)
3678 {
3679         struct sk_buff *skb;
3680         int err = -ENOBUFS;
3681
3682         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3683         if (skb == NULL)
3684                 goto errout;
3685
3686         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3687         if (err < 0) {
3688                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3689                 WARN_ON(err == -EMSGSIZE);
3690                 kfree_skb(skb);
3691                 goto errout;
3692         }
3693         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3694 errout:
3695         if (err < 0)
3696                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3697 }
3698
3699 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3700 {
3701         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3702
3703         switch (event) {
3704         case RTM_NEWADDR:
3705                 /*
3706                  * If the address was optimistic
3707                  * we inserted the route at the start of
3708                  * our DAD process, so we don't need
3709                  * to do it again
3710                  */
3711                 if (!(ifp->rt->rt6i_node))
3712                         ip6_ins_rt(ifp->rt);
3713                 if (ifp->idev->cnf.forwarding)
3714                         addrconf_join_anycast(ifp);
3715                 break;
3716         case RTM_DELADDR:
3717                 if (ifp->idev->cnf.forwarding)
3718                         addrconf_leave_anycast(ifp);
3719                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3720                 dst_hold(&ifp->rt->u.dst);
3721                 if (ip6_del_rt(ifp->rt))
3722                         dst_free(&ifp->rt->u.dst);
3723                 break;
3724         }
3725 }
3726
3727 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3728 {
3729         rcu_read_lock_bh();
3730         if (likely(ifp->idev->dead == 0))
3731                 __ipv6_ifa_notify(event, ifp);
3732         rcu_read_unlock_bh();
3733 }
3734
3735 #ifdef CONFIG_SYSCTL
3736
3737 static
3738 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3739                            void __user *buffer, size_t *lenp, loff_t *ppos)
3740 {
3741         int *valp = ctl->data;
3742         int val = *valp;
3743         int ret;
3744
3745         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3746
3747         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3748                 if (valp != &ipv6_devconf.forwarding) {
3749                         if ((!*valp) ^ (!val)) {
3750                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3751                                 if (idev == NULL)
3752                                         return ret;
3753                                 dev_forward_change(idev);
3754                         }
3755                 } else {
3756                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3757                         addrconf_forward_change();
3758                 }
3759                 if (*valp)
3760                         rt6_purge_dflt_routers();
3761         }
3762
3763         return ret;
3764 }
3765
3766 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3767                                             int __user *name, int nlen,
3768                                             void __user *oldval,
3769                                             size_t __user *oldlenp,
3770                                             void __user *newval, size_t newlen)
3771 {
3772         int *valp = table->data;
3773         int new;
3774
3775         if (!newval || !newlen)
3776                 return 0;
3777         if (newlen != sizeof(int))
3778                 return -EINVAL;
3779         if (get_user(new, (int __user *)newval))
3780                 return -EFAULT;
3781         if (new == *valp)
3782                 return 0;
3783         if (oldval && oldlenp) {
3784                 size_t len;
3785                 if (get_user(len, oldlenp))
3786                         return -EFAULT;
3787                 if (len) {
3788                         if (len > table->maxlen)
3789                                 len = table->maxlen;
3790                         if (copy_to_user(oldval, valp, len))
3791                                 return -EFAULT;
3792                         if (put_user(len, oldlenp))
3793                                 return -EFAULT;
3794                 }
3795         }
3796
3797         if (valp != &ipv6_devconf_dflt.forwarding) {
3798                 if (valp != &ipv6_devconf.forwarding) {
3799                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3800                         int changed;
3801                         if (unlikely(idev == NULL))
3802                                 return -ENODEV;
3803                         changed = (!*valp) ^ (!new);
3804                         *valp = new;
3805                         if (changed)
3806                                 dev_forward_change(idev);
3807                 } else {
3808                         *valp = new;
3809                         addrconf_forward_change();
3810                 }
3811
3812                 if (*valp)
3813                         rt6_purge_dflt_routers();
3814         } else
3815                 *valp = new;
3816
3817         return 1;
3818 }
3819
3820 static struct addrconf_sysctl_table
3821 {
3822         struct ctl_table_header *sysctl_header;
3823         ctl_table addrconf_vars[__NET_IPV6_MAX];
3824         ctl_table addrconf_dev[2];
3825         ctl_table addrconf_conf_dir[2];
3826         ctl_table addrconf_proto_dir[2];
3827         ctl_table addrconf_root_dir[2];
3828 } addrconf_sysctl __read_mostly = {
3829         .sysctl_header = NULL,
3830         .addrconf_vars = {
3831                 {
3832                         .ctl_name       =       NET_IPV6_FORWARDING,
3833                         .procname       =       "forwarding",
3834                         .data           =       &ipv6_devconf.forwarding,
3835                         .maxlen         =       sizeof(int),
3836                         .mode           =       0644,
3837                         .proc_handler   =       &addrconf_sysctl_forward,
3838                         .strategy       =       &addrconf_sysctl_forward_strategy,
3839                 },
3840                 {
3841                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3842                         .procname       =       "hop_limit",
3843                         .data           =       &ipv6_devconf.hop_limit,
3844                         .maxlen         =       sizeof(int),
3845                         .mode           =       0644,
3846                         .proc_handler   =       proc_dointvec,
3847                 },
3848                 {
3849                         .ctl_name       =       NET_IPV6_MTU,
3850                         .procname       =       "mtu",
3851                         .data           =       &ipv6_devconf.mtu6,
3852                         .maxlen         =       sizeof(int),
3853                         .mode           =       0644,
3854                         .proc_handler   =       &proc_dointvec,
3855                 },
3856                 {
3857                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3858                         .procname       =       "accept_ra",
3859                         .data           =       &ipv6_devconf.accept_ra,
3860                         .maxlen         =       sizeof(int),
3861                         .mode           =       0644,
3862                         .proc_handler   =       &proc_dointvec,
3863                 },
3864                 {
3865                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3866                         .procname       =       "accept_redirects",
3867                         .data           =       &ipv6_devconf.accept_redirects,
3868                         .maxlen         =       sizeof(int),
3869                         .mode           =       0644,
3870                         .proc_handler   =       &proc_dointvec,
3871                 },
3872                 {
3873                         .ctl_name       =       NET_IPV6_AUTOCONF,
3874                         .procname       =       "autoconf",
3875                         .data           =       &ipv6_devconf.autoconf,
3876                         .maxlen         =       sizeof(int),
3877                         .mode           =       0644,
3878                         .proc_handler   =       &proc_dointvec,
3879                 },
3880                 {
3881                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3882                         .procname       =       "dad_transmits",
3883                         .data           =       &ipv6_devconf.dad_transmits,
3884                         .maxlen         =       sizeof(int),
3885                         .mode           =       0644,
3886                         .proc_handler   =       &proc_dointvec,
3887                 },
3888                 {
3889                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3890                         .procname       =       "router_solicitations",
3891                         .data           =       &ipv6_devconf.rtr_solicits,
3892                         .maxlen         =       sizeof(int),
3893                         .mode           =       0644,
3894                         .proc_handler   =       &proc_dointvec,
3895                 },
3896                 {
3897                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3898                         .procname       =       "router_solicitation_interval",
3899                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3900                         .maxlen         =       sizeof(int),
3901                         .mode           =       0644,
3902                         .proc_handler   =       &proc_dointvec_jiffies,
3903                         .strategy       =       &sysctl_jiffies,
3904                 },
3905                 {
3906                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3907                         .procname       =       "router_solicitation_delay",
3908                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3909                         .maxlen         =       sizeof(int),
3910                         .mode           =       0644,
3911                         .proc_handler   =       &proc_dointvec_jiffies,
3912                         .strategy       =       &sysctl_jiffies,
3913                 },
3914                 {
3915                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3916                         .procname       =       "force_mld_version",
3917                         .data           =       &ipv6_devconf.force_mld_version,
3918                         .maxlen         =       sizeof(int),
3919                         .mode           =       0644,
3920                         .proc_handler   =       &proc_dointvec,
3921                 },
3922 #ifdef CONFIG_IPV6_PRIVACY
3923                 {
3924                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3925                         .procname       =       "use_tempaddr",
3926                         .data           =       &ipv6_devconf.use_tempaddr,
3927                         .maxlen         =       sizeof(int),
3928                         .mode           =       0644,
3929                         .proc_handler   =       &proc_dointvec,
3930                 },
3931                 {
3932                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3933                         .procname       =       "temp_valid_lft",
3934                         .data           =       &ipv6_devconf.temp_valid_lft,
3935                         .maxlen         =       sizeof(int),
3936                         .mode           =       0644,
3937                         .proc_handler   =       &proc_dointvec,
3938                 },
3939                 {
3940                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3941                         .procname       =       "temp_prefered_lft",
3942                         .data           =       &ipv6_devconf.temp_prefered_lft,
3943                         .maxlen         =       sizeof(int),
3944                         .mode           =       0644,
3945                         .proc_handler   =       &proc_dointvec,
3946                 },
3947                 {
3948                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3949                         .procname       =       "regen_max_retry",
3950                         .data           =       &ipv6_devconf.regen_max_retry,
3951                         .maxlen         =       sizeof(int),
3952                         .mode           =       0644,
3953                         .proc_handler   =       &proc_dointvec,
3954                 },
3955                 {
3956                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3957                         .procname       =       "max_desync_factor",
3958                         .data           =       &ipv6_devconf.max_desync_factor,
3959                         .maxlen         =       sizeof(int),
3960                         .mode           =       0644,
3961                         .proc_handler   =       &proc_dointvec,
3962                 },
3963 #endif
3964                 {
3965                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3966                         .procname       =       "max_addresses",
3967                         .data           =       &ipv6_devconf.max_addresses,
3968                         .maxlen         =       sizeof(int),
3969                         .mode           =       0644,
3970                         .proc_handler   =       &proc_dointvec,
3971                 },
3972                 {
3973                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3974                         .procname       =       "accept_ra_defrtr",
3975                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3976                         .maxlen         =       sizeof(int),
3977                         .mode           =       0644,
3978                         .proc_handler   =       &proc_dointvec,
3979                 },
3980                 {
3981                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3982                         .procname       =       "accept_ra_pinfo",
3983                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3984                         .maxlen         =       sizeof(int),
3985                         .mode           =       0644,
3986                         .proc_handler   =       &proc_dointvec,
3987                 },
3988 #ifdef CONFIG_IPV6_ROUTER_PREF
3989                 {
3990                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3991                         .procname       =       "accept_ra_rtr_pref",
3992                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3993                         .maxlen         =       sizeof(int),
3994                         .mode           =       0644,
3995                         .proc_handler   =       &proc_dointvec,
3996                 },
3997                 {
3998                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3999                         .procname       =       "router_probe_interval",
4000                         .data           =       &ipv6_devconf.rtr_probe_interval,
4001                         .maxlen         =       sizeof(int),
4002                         .mode           =       0644,
4003                         .proc_handler   =       &proc_dointvec_jiffies,
4004                         .strategy       =       &sysctl_jiffies,
4005                 },
4006 #ifdef CONFIG_IPV6_ROUTE_INFO
4007                 {
4008                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4009                         .procname       =       "accept_ra_rt_info_max_plen",
4010                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4011                         .maxlen         =       sizeof(int),
4012                         .mode           =       0644,
4013                         .proc_handler   =       &proc_dointvec,
4014                 },
4015 #endif
4016 #endif
4017                 {
4018                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4019                         .procname       =       "proxy_ndp",
4020                         .data           =       &ipv6_devconf.proxy_ndp,
4021                         .maxlen         =       sizeof(int),
4022                         .mode           =       0644,
4023                         .proc_handler   =       &proc_dointvec,
4024                 },
4025                 {
4026                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4027                         .procname       =       "accept_source_route",
4028                         .data           =       &ipv6_devconf.accept_source_route,
4029                         .maxlen         =       sizeof(int),
4030                         .mode           =       0644,
4031                         .proc_handler   =       &proc_dointvec,
4032                 },
4033 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4034                 {
4035                         .ctl_name       =       CTL_UNNUMBERED,
4036                         .procname       =       "optimistic_dad",
4037                         .data           =       &ipv6_devconf.optimistic_dad,
4038                         .maxlen         =       sizeof(int),
4039                         .mode           =       0644,
4040                         .proc_handler   =       &proc_dointvec,
4041
4042                 },
4043 #endif
4044                 {
4045                         .ctl_name       =       0,      /* sentinel */
4046                 }
4047         },
4048         .addrconf_dev = {
4049                 {
4050                         .ctl_name       =       NET_PROTO_CONF_ALL,
4051                         .procname       =       "all",
4052                         .mode           =       0555,
4053                         .child          =       addrconf_sysctl.addrconf_vars,
4054                 },
4055                 {
4056                         .ctl_name       =       0,      /* sentinel */
4057                 }
4058         },
4059         .addrconf_conf_dir = {
4060                 {
4061                         .ctl_name       =       NET_IPV6_CONF,
4062                         .procname       =       "conf",
4063                         .mode           =       0555,
4064                         .child          =       addrconf_sysctl.addrconf_dev,
4065                 },
4066                 {
4067                         .ctl_name       =       0,      /* sentinel */
4068                 }
4069         },
4070         .addrconf_proto_dir = {
4071                 {
4072                         .ctl_name       =       NET_IPV6,
4073                         .procname       =       "ipv6",
4074                         .mode           =       0555,
4075                         .child          =       addrconf_sysctl.addrconf_conf_dir,
4076                 },
4077                 {
4078                         .ctl_name       =       0,      /* sentinel */
4079                 }
4080         },
4081         .addrconf_root_dir = {
4082                 {
4083                         .ctl_name       =       CTL_NET,
4084                         .procname       =       "net",
4085                         .mode           =       0555,
4086                         .child          =       addrconf_sysctl.addrconf_proto_dir,
4087                 },
4088                 {
4089                         .ctl_name       =       0,      /* sentinel */
4090                 }
4091         },
4092 };
4093
4094 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4095 {
4096         int i;
4097         struct net_device *dev = idev ? idev->dev : NULL;
4098         struct addrconf_sysctl_table *t;
4099         char *dev_name = NULL;
4100
4101         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4102         if (t == NULL)
4103                 return;
4104         for (i=0; t->addrconf_vars[i].data; i++) {
4105                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4106                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4107         }
4108         if (dev) {
4109                 dev_name = dev->name;
4110                 t->addrconf_dev[0].ctl_name = dev->ifindex;
4111         } else {
4112                 dev_name = "default";
4113                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4114         }
4115
4116         /*
4117          * Make a copy of dev_name, because '.procname' is regarded as const
4118          * by sysctl and we wouldn't want anyone to change it under our feet
4119          * (see SIOCSIFNAME).
4120          */
4121         dev_name = kstrdup(dev_name, GFP_KERNEL);
4122         if (!dev_name)
4123             goto free;
4124
4125         t->addrconf_dev[0].procname = dev_name;
4126
4127         t->addrconf_dev[0].child = t->addrconf_vars;
4128         t->addrconf_conf_dir[0].child = t->addrconf_dev;
4129         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4130         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4131
4132         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4133         if (t->sysctl_header == NULL)
4134                 goto free_procname;
4135         else
4136                 p->sysctl = t;
4137         return;
4138
4139         /* error path */
4140  free_procname:
4141         kfree(dev_name);
4142  free:
4143         kfree(t);
4144
4145         return;
4146 }
4147
4148 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4149 {
4150         if (p->sysctl) {
4151                 struct addrconf_sysctl_table *t = p->sysctl;
4152                 p->sysctl = NULL;
4153                 unregister_sysctl_table(t->sysctl_header);
4154                 kfree(t->addrconf_dev[0].procname);
4155                 kfree(t);
4156         }
4157 }
4158
4159
4160 #endif
4161
4162 /*
4163  *      Device notifier
4164  */
4165
4166 int register_inet6addr_notifier(struct notifier_block *nb)
4167 {
4168         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4169 }
4170
4171 EXPORT_SYMBOL(register_inet6addr_notifier);
4172
4173 int unregister_inet6addr_notifier(struct notifier_block *nb)
4174 {
4175         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4176 }
4177
4178 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4179
4180 /*
4181  *      Init / cleanup code
4182  */
4183
4184 int __init addrconf_init(void)
4185 {
4186         int err = 0;
4187
4188         /* The addrconf netdev notifier requires that loopback_dev
4189          * has it's ipv6 private information allocated and setup
4190          * before it can bring up and give link-local addresses
4191          * to other devices which are up.
4192          *
4193          * Unfortunately, loopback_dev is not necessarily the first
4194          * entry in the global dev_base list of net devices.  In fact,
4195          * it is likely to be the very last entry on that list.
4196          * So this causes the notifier registry below to try and
4197          * give link-local addresses to all devices besides loopback_dev
4198          * first, then loopback_dev, which cases all the non-loopback_dev
4199          * devices to fail to get a link-local address.
4200          *
4201          * So, as a temporary fix, allocate the ipv6 structure for
4202          * loopback_dev first by hand.
4203          * Longer term, all of the dependencies ipv6 has upon the loopback
4204          * device and it being up should be removed.
4205          */
4206         rtnl_lock();
4207         if (!ipv6_add_dev(init_net.loopback_dev))
4208                 err = -ENOMEM;
4209         rtnl_unlock();
4210         if (err)
4211                 return err;
4212
4213         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4214         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4215 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4216         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4217         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4218         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4219         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4220 #endif
4221
4222         register_netdevice_notifier(&ipv6_dev_notf);
4223
4224         addrconf_verify(0);
4225
4226         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4227         if (err < 0)
4228                 goto errout;
4229
4230         /* Only the first call to __rtnl_register can fail */
4231         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4232         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4233         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4234         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4235         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4236
4237 #ifdef CONFIG_SYSCTL
4238         addrconf_sysctl.sysctl_header =
4239                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4240         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4241 #endif
4242
4243         return 0;
4244 errout:
4245         unregister_netdevice_notifier(&ipv6_dev_notf);
4246
4247         return err;
4248 }
4249
4250 void __exit addrconf_cleanup(void)
4251 {
4252         struct net_device *dev;
4253         struct inet6_ifaddr *ifa;
4254         int i;
4255
4256         unregister_netdevice_notifier(&ipv6_dev_notf);
4257
4258 #ifdef CONFIG_SYSCTL
4259         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4260         addrconf_sysctl_unregister(&ipv6_devconf);
4261 #endif
4262
4263         rtnl_lock();
4264
4265         /*
4266          *      clean dev list.
4267          */
4268
4269         for_each_netdev(&init_net, dev) {
4270                 if (__in6_dev_get(dev) == NULL)
4271                         continue;
4272                 addrconf_ifdown(dev, 1);
4273         }
4274         addrconf_ifdown(init_net.loopback_dev, 2);
4275
4276         /*
4277          *      Check hash table.
4278          */
4279
4280         write_lock_bh(&addrconf_hash_lock);
4281         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4282                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4283                         struct inet6_ifaddr *bifa;
4284
4285                         bifa = ifa;
4286                         ifa = ifa->lst_next;
4287                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4288                         /* Do not free it; something is wrong.
4289                            Now we can investigate it with debugger.
4290                          */
4291                 }
4292         }
4293         write_unlock_bh(&addrconf_hash_lock);
4294
4295         del_timer(&addr_chk_timer);
4296
4297         rtnl_unlock();
4298 }