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

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <asm/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90
  91 /* Set to 3 to get tracing... */
  92 #define ACONF_DEBUG 2
  93
  94 #if ACONF_DEBUG >= 3
  95 #define ADBG(x) printk x
  96 #else
  97 #define ADBG(x)
  98 #endif
  99
 100 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 102
 103 #ifdef CONFIG_SYSCTL
 104 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 105 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 106 #endif
 107
 108 #ifdef CONFIG_IPV6_PRIVACY
 109 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 110 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 111 static void ipv6_regen_rndid(unsigned long data);
 112
 113 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 114 #endif
 115
 116 static int ipv6_count_addresses(struct inet6_dev *idev);
 117
 118 /*
 119  *      Configured unicast address hash table
 120  */
 121 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 122 static DEFINE_RWLOCK(addrconf_hash_lock);
 123
 124 static void addrconf_verify(unsigned long);
 125
 126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 127 static DEFINE_SPINLOCK(addrconf_verify_lock);
 128
 129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 131
 132 static int addrconf_ifdown(struct net_device *dev, int how);
 133
 134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 135 static void addrconf_dad_timer(unsigned long data);
 136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 137 static void addrconf_dad_run(struct inet6_dev *idev);
 138 static void addrconf_rs_timer(unsigned long data);
 139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 141
 142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 143                                 struct prefix_info *pinfo);
 144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 145
 146 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 147
 148 struct ipv6_devconf ipv6_devconf __read_mostly = {
 149         .forwarding             = 0,
 150         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 151         .mtu6                   = IPV6_MIN_MTU,
 152         .accept_ra              = 1,
 153         .accept_redirects       = 1,
 154         .autoconf               = 1,
 155         .force_mld_version      = 0,
 156         .dad_transmits          = 1,
 157         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 158         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 159         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 160 #ifdef CONFIG_IPV6_PRIVACY
 161         .use_tempaddr           = 0,
 162         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 163         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 164         .regen_max_retry        = REGEN_MAX_RETRY,
 165         .max_desync_factor      = MAX_DESYNC_FACTOR,
 166 #endif
 167         .max_addresses          = IPV6_MAX_ADDRESSES,
 168         .accept_ra_defrtr       = 1,
 169         .accept_ra_pinfo        = 1,
 170 #ifdef CONFIG_IPV6_ROUTER_PREF
 171         .accept_ra_rtr_pref     = 1,
 172         .rtr_probe_interval     = 60 * HZ,
 173 #ifdef CONFIG_IPV6_ROUTE_INFO
 174         .accept_ra_rt_info_max_plen = 0,
 175 #endif
 176 #endif
 177         .proxy_ndp              = 0,
 178         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 179 };
 180
 181 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 182         .forwarding             = 0,
 183         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 184         .mtu6                   = IPV6_MIN_MTU,
 185         .accept_ra              = 1,
 186         .accept_redirects       = 1,
 187         .autoconf               = 1,
 188         .dad_transmits          = 1,
 189         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 190         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 191         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 192 #ifdef CONFIG_IPV6_PRIVACY
 193         .use_tempaddr           = 0,
 194         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 195         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 196         .regen_max_retry        = REGEN_MAX_RETRY,
 197         .max_desync_factor      = MAX_DESYNC_FACTOR,
 198 #endif
 199         .max_addresses          = IPV6_MAX_ADDRESSES,
 200         .accept_ra_defrtr       = 1,
 201         .accept_ra_pinfo        = 1,
 202 #ifdef CONFIG_IPV6_ROUTER_PREF
 203         .accept_ra_rtr_pref     = 1,
 204         .rtr_probe_interval     = 60 * HZ,
 205 #ifdef CONFIG_IPV6_ROUTE_INFO
 206         .accept_ra_rt_info_max_plen = 0,
 207 #endif
 208 #endif
 209         .proxy_ndp              = 0,
 210         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 211 };
 212
 213 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 214 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 215 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 216
 217 /* Check if a valid qdisc is available */
 218 static inline int addrconf_qdisc_ok(struct net_device *dev)
 219 {
 220         return (dev->qdisc != &noop_qdisc);
 221 }
 222
 223 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 224 {
 225         if (del_timer(&ifp->timer))
 226                 __in6_ifa_put(ifp);
 227 }
 228
 229 enum addrconf_timer_t
 230 {
 231         AC_NONE,
 232         AC_DAD,
 233         AC_RS,
 234 };
 235
 236 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 237                                enum addrconf_timer_t what,
 238                                unsigned long when)
 239 {
 240         if (!del_timer(&ifp->timer))
 241                 in6_ifa_hold(ifp);
 242
 243         switch (what) {
 244         case AC_DAD:
 245                 ifp->timer.function = addrconf_dad_timer;
 246                 break;
 247         case AC_RS:
 248                 ifp->timer.function = addrconf_rs_timer;
 249                 break;
 250         default:;
 251         }
 252         ifp->timer.expires = jiffies + when;
 253         add_timer(&ifp->timer);
 254 }
 255
 256 static int snmp6_alloc_dev(struct inet6_dev *idev)
 257 {
 258         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         init_timer(&ndev->regen_timer);
 370         ndev->regen_timer.function = ipv6_regen_rndid;
 371         ndev->regen_timer.data = (unsigned long) ndev;
 372         if ((dev->flags&IFF_LOOPBACK) ||
 373             dev->type == ARPHRD_TUNNEL ||
 374 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 375             dev->type == ARPHRD_SIT ||
 376 #endif
 377             dev->type == ARPHRD_NONE) {
 378                 printk(KERN_INFO
 379                        "%s: Disabled Privacy Extensions\n",
 380                        dev->name);
 381                 ndev->cnf.use_tempaddr = -1;
 382         } else {
 383                 in6_dev_hold(ndev);
 384                 ipv6_regen_rndid((unsigned long) ndev);
 385         }
 386 #endif
 387
 388         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 389                 ndev->if_flags |= IF_READY;
 390
 391         ipv6_mc_init_dev(ndev);
 392         ndev->tstamp = jiffies;
 393 #ifdef CONFIG_SYSCTL
 394         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 395                               NET_IPV6_NEIGH, "ipv6",
 396                               &ndisc_ifinfo_sysctl_change,
 397                               NULL);
 398         addrconf_sysctl_register(ndev, &ndev->cnf);
 399 #endif
 400         /* protected by rtnl_lock */
 401         rcu_assign_pointer(dev->ip6_ptr, ndev);
 402
 403         /* Join all-node multicast group */
 404         ipv6_addr_all_nodes(&maddr);
 405         ipv6_dev_mc_inc(dev, &maddr);
 406
 407         return ndev;
 408 }
 409
 410 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 411 {
 412         struct inet6_dev *idev;
 413
 414         ASSERT_RTNL();
 415
 416         if ((idev = __in6_dev_get(dev)) == NULL) {
 417                 if ((idev = ipv6_add_dev(dev)) == NULL)
 418                         return NULL;
 419         }
 420
 421         if (dev->flags&IFF_UP)
 422                 ipv6_mc_up(idev);
 423         return idev;
 424 }
 425
 426 #ifdef CONFIG_SYSCTL
 427 static void dev_forward_change(struct inet6_dev *idev)
 428 {
 429         struct net_device *dev;
 430         struct inet6_ifaddr *ifa;
 431         struct in6_addr addr;
 432
 433         if (!idev)
 434                 return;
 435         dev = idev->dev;
 436         if (dev && (dev->flags & IFF_MULTICAST)) {
 437                 ipv6_addr_all_routers(&addr);
 438
 439                 if (idev->cnf.forwarding)
 440                         ipv6_dev_mc_inc(dev, &addr);
 441                 else
 442                         ipv6_dev_mc_dec(dev, &addr);
 443         }
 444         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 445                 if (ifa->flags&IFA_F_TENTATIVE)
 446                         continue;
 447                 if (idev->cnf.forwarding)
 448                         addrconf_join_anycast(ifa);
 449                 else
 450                         addrconf_leave_anycast(ifa);
 451         }
 452 }
 453
 454
 455 static void addrconf_forward_change(void)
 456 {
 457         struct net_device *dev;
 458         struct inet6_dev *idev;
 459
 460         read_lock(&dev_base_lock);
 461         for_each_netdev(&init_net, dev) {
 462                 rcu_read_lock();
 463                 idev = __in6_dev_get(dev);
 464                 if (idev) {
 465                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 466                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 467                         if (changed)
 468                                 dev_forward_change(idev);
 469                 }
 470                 rcu_read_unlock();
 471         }
 472         read_unlock(&dev_base_lock);
 473 }
 474 #endif
 475
 476 /* Nobody refers to this ifaddr, destroy it */
 477
 478 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 479 {
 480         BUG_TRAP(ifp->if_next==NULL);
 481         BUG_TRAP(ifp->lst_next==NULL);
 482 #ifdef NET_REFCNT_DEBUG
 483         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 484 #endif
 485
 486         in6_dev_put(ifp->idev);
 487
 488         if (del_timer(&ifp->timer))
 489                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 490
 491         if (!ifp->dead) {
 492                 printk("Freeing alive inet6 address %p\n", ifp);
 493                 return;
 494         }
 495         dst_release(&ifp->rt->u.dst);
 496
 497         kfree(ifp);
 498 }
 499
 500 static void
 501 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 502 {
 503         struct inet6_ifaddr *ifa, **ifap;
 504         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 505
 506         /*
 507          * Each device address list is sorted in order of scope -
 508          * global before linklocal.
 509          */
 510         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 511              ifap = &ifa->if_next) {
 512                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 513                         break;
 514         }
 515
 516         ifp->if_next = *ifap;
 517         *ifap = ifp;
 518 }
 519
 520 /* On success it returns ifp with increased reference count */
 521
 522 static struct inet6_ifaddr *
 523 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 524               int scope, u32 flags)
 525 {
 526         struct inet6_ifaddr *ifa = NULL;
 527         struct rt6_info *rt;
 528         int hash;
 529         int err = 0;
 530
 531         rcu_read_lock_bh();
 532         if (idev->dead) {
 533                 err = -ENODEV;                  /*XXX*/
 534                 goto out2;
 535         }
 536
 537         write_lock(&addrconf_hash_lock);
 538
 539         /* Ignore adding duplicate addresses on an interface */
 540         if (ipv6_chk_same_addr(addr, idev->dev)) {
 541                 ADBG(("ipv6_add_addr: already assigned\n"));
 542                 err = -EEXIST;
 543                 goto out;
 544         }
 545
 546         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 547
 548         if (ifa == NULL) {
 549                 ADBG(("ipv6_add_addr: malloc failed\n"));
 550                 err = -ENOBUFS;
 551                 goto out;
 552         }
 553
 554         rt = addrconf_dst_alloc(idev, addr, 0);
 555         if (IS_ERR(rt)) {
 556                 err = PTR_ERR(rt);
 557                 goto out;
 558         }
 559
 560         ipv6_addr_copy(&ifa->addr, addr);
 561
 562         spin_lock_init(&ifa->lock);
 563         init_timer(&ifa->timer);
 564         ifa->timer.data = (unsigned long) ifa;
 565         ifa->scope = scope;
 566         ifa->prefix_len = pfxlen;
 567         ifa->flags = flags | IFA_F_TENTATIVE;
 568         ifa->cstamp = ifa->tstamp = jiffies;
 569
 570         ifa->rt = rt;
 571
 572         /*
 573          * part one of RFC 4429, section 3.3
 574          * We should not configure an address as
 575          * optimistic if we do not yet know the link
 576          * layer address of our nexhop router
 577          */
 578
 579         if (rt->rt6i_nexthop == NULL)
 580                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 581
 582         ifa->idev = idev;
 583         in6_dev_hold(idev);
 584         /* For caller */
 585         in6_ifa_hold(ifa);
 586
 587         /* Add to big hash table */
 588         hash = ipv6_addr_hash(addr);
 589
 590         ifa->lst_next = inet6_addr_lst[hash];
 591         inet6_addr_lst[hash] = ifa;
 592         in6_ifa_hold(ifa);
 593         write_unlock(&addrconf_hash_lock);
 594
 595         write_lock(&idev->lock);
 596         /* Add to inet6_dev unicast addr list. */
 597         ipv6_link_dev_addr(idev, ifa);
 598
 599 #ifdef CONFIG_IPV6_PRIVACY
 600         if (ifa->flags&IFA_F_TEMPORARY) {
 601                 ifa->tmp_next = idev->tempaddr_list;
 602                 idev->tempaddr_list = ifa;
 603                 in6_ifa_hold(ifa);
 604         }
 605 #endif
 606
 607         in6_ifa_hold(ifa);
 608         write_unlock(&idev->lock);
 609 out2:
 610         rcu_read_unlock_bh();
 611
 612         if (likely(err == 0))
 613                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 614         else {
 615                 kfree(ifa);
 616                 ifa = ERR_PTR(err);
 617         }
 618
 619         return ifa;
 620 out:
 621         write_unlock(&addrconf_hash_lock);
 622         goto out2;
 623 }
 624
 625 /* This function wants to get referenced ifp and releases it before return */
 626
 627 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 628 {
 629         struct inet6_ifaddr *ifa, **ifap;
 630         struct inet6_dev *idev = ifp->idev;
 631         int hash;
 632         int deleted = 0, onlink = 0;
 633         unsigned long expires = jiffies;
 634
 635         hash = ipv6_addr_hash(&ifp->addr);
 636
 637         ifp->dead = 1;
 638
 639         write_lock_bh(&addrconf_hash_lock);
 640         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 641              ifap = &ifa->lst_next) {
 642                 if (ifa == ifp) {
 643                         *ifap = ifa->lst_next;
 644                         __in6_ifa_put(ifp);
 645                         ifa->lst_next = NULL;
 646                         break;
 647                 }
 648         }
 649         write_unlock_bh(&addrconf_hash_lock);
 650
 651         write_lock_bh(&idev->lock);
 652 #ifdef CONFIG_IPV6_PRIVACY
 653         if (ifp->flags&IFA_F_TEMPORARY) {
 654                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 655                      ifap = &ifa->tmp_next) {
 656                         if (ifa == ifp) {
 657                                 *ifap = ifa->tmp_next;
 658                                 if (ifp->ifpub) {
 659                                         in6_ifa_put(ifp->ifpub);
 660                                         ifp->ifpub = NULL;
 661                                 }
 662                                 __in6_ifa_put(ifp);
 663                                 ifa->tmp_next = NULL;
 664                                 break;
 665                         }
 666                 }
 667         }
 668 #endif
 669
 670         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 671                 if (ifa == ifp) {
 672                         *ifap = ifa->if_next;
 673                         __in6_ifa_put(ifp);
 674                         ifa->if_next = NULL;
 675                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 676                                 break;
 677                         deleted = 1;
 678                         continue;
 679                 } else if (ifp->flags & IFA_F_PERMANENT) {
 680                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 681                                               ifp->prefix_len)) {
 682                                 if (ifa->flags & IFA_F_PERMANENT) {
 683                                         onlink = 1;
 684                                         if (deleted)
 685                                                 break;
 686                                 } else {
 687                                         unsigned long lifetime;
 688
 689                                         if (!onlink)
 690                                                 onlink = -1;
 691
 692                                         spin_lock(&ifa->lock);
 693                                         lifetime = min_t(unsigned long,
 694                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 695                                         if (time_before(expires,
 696                                                         ifa->tstamp + lifetime * HZ))
 697                                                 expires = ifa->tstamp + lifetime * HZ;
 698                                         spin_unlock(&ifa->lock);
 699                                 }
 700                         }
 701                 }
 702                 ifap = &ifa->if_next;
 703         }
 704         write_unlock_bh(&idev->lock);
 705
 706         ipv6_ifa_notify(RTM_DELADDR, ifp);
 707
 708         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 709
 710         addrconf_del_timer(ifp);
 711
 712         /*
 713          * Purge or update corresponding prefix
 714          *
 715          * 1) we don't purge prefix here if address was not permanent.
 716          *    prefix is managed by its own lifetime.
 717          * 2) if there're no addresses, delete prefix.
 718          * 3) if there're still other permanent address(es),
 719          *    corresponding prefix is still permanent.
 720          * 4) otherwise, update prefix lifetime to the
 721          *    longest valid lifetime among the corresponding
 722          *    addresses on the device.
 723          *    Note: subsequent RA will update lifetime.
 724          *
 725          * --yoshfuji
 726          */
 727         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 728                 struct in6_addr prefix;
 729                 struct rt6_info *rt;
 730
 731                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 732                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 733
 734                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 735                         if (onlink == 0) {
 736                                 ip6_del_rt(rt);
 737                                 rt = NULL;
 738                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 739                                 rt->rt6i_expires = expires;
 740                                 rt->rt6i_flags |= RTF_EXPIRES;
 741                         }
 742                 }
 743                 dst_release(&rt->u.dst);
 744         }
 745
 746         in6_ifa_put(ifp);
 747 }
 748
 749 #ifdef CONFIG_IPV6_PRIVACY
 750 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 751 {
 752         struct inet6_dev *idev = ifp->idev;
 753         struct in6_addr addr, *tmpaddr;
 754         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 755         int tmp_plen;
 756         int ret = 0;
 757         int max_addresses;
 758         u32 addr_flags;
 759
 760         write_lock(&idev->lock);
 761         if (ift) {
 762                 spin_lock_bh(&ift->lock);
 763                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 764                 spin_unlock_bh(&ift->lock);
 765                 tmpaddr = &addr;
 766         } else {
 767                 tmpaddr = NULL;
 768         }
 769 retry:
 770         in6_dev_hold(idev);
 771         if (idev->cnf.use_tempaddr <= 0) {
 772                 write_unlock(&idev->lock);
 773                 printk(KERN_INFO
 774                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 775                 in6_dev_put(idev);
 776                 ret = -1;
 777                 goto out;
 778         }
 779         spin_lock_bh(&ifp->lock);
 780         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 781                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 782                 spin_unlock_bh(&ifp->lock);
 783                 write_unlock(&idev->lock);
 784                 printk(KERN_WARNING
 785                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 786                 in6_dev_put(idev);
 787                 ret = -1;
 788                 goto out;
 789         }
 790         in6_ifa_hold(ifp);
 791         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 792         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 793                 spin_unlock_bh(&ifp->lock);
 794                 write_unlock(&idev->lock);
 795                 printk(KERN_WARNING
 796                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 797                 in6_ifa_put(ifp);
 798                 in6_dev_put(idev);
 799                 ret = -1;
 800                 goto out;
 801         }
 802         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 803         tmp_valid_lft = min_t(__u32,
 804                               ifp->valid_lft,
 805                               idev->cnf.temp_valid_lft);
 806         tmp_prefered_lft = min_t(__u32,
 807                                  ifp->prefered_lft,
 808                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 809         tmp_plen = ifp->prefix_len;
 810         max_addresses = idev->cnf.max_addresses;
 811         tmp_cstamp = ifp->cstamp;
 812         tmp_tstamp = ifp->tstamp;
 813         spin_unlock_bh(&ifp->lock);
 814
 815         write_unlock(&idev->lock);
 816
 817         addr_flags = IFA_F_TEMPORARY;
 818         /* set in addrconf_prefix_rcv() */
 819         if (ifp->flags & IFA_F_OPTIMISTIC)
 820                 addr_flags |= IFA_F_OPTIMISTIC;
 821
 822         ift = !max_addresses ||
 823               ipv6_count_addresses(idev) < max_addresses ?
 824                 ipv6_add_addr(idev, &addr, tmp_plen,
 825                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 826                               addr_flags) : NULL;
 827         if (!ift || IS_ERR(ift)) {
 828                 in6_ifa_put(ifp);
 829                 in6_dev_put(idev);
 830                 printk(KERN_INFO
 831                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 832                 tmpaddr = &addr;
 833                 write_lock(&idev->lock);
 834                 goto retry;
 835         }
 836
 837         spin_lock_bh(&ift->lock);
 838         ift->ifpub = ifp;
 839         ift->valid_lft = tmp_valid_lft;
 840         ift->prefered_lft = tmp_prefered_lft;
 841         ift->cstamp = tmp_cstamp;
 842         ift->tstamp = tmp_tstamp;
 843         spin_unlock_bh(&ift->lock);
 844
 845         addrconf_dad_start(ift, 0);
 846         in6_ifa_put(ift);
 847         in6_dev_put(idev);
 848 out:
 849         return ret;
 850 }
 851 #endif
 852
 853 /*
 854  *      Choose an appropriate source address (RFC3484)
 855  */
 856 struct ipv6_saddr_score {
 857         int             addr_type;
 858         unsigned int    attrs;
 859         int             matchlen;
 860         int             scope;
 861         unsigned int    rule;
 862 };
 863
 864 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 865 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 866 #define IPV6_SADDR_SCORE_HOA            0x0008
 867 #define IPV6_SADDR_SCORE_OIF            0x0010
 868 #define IPV6_SADDR_SCORE_LABEL          0x0020
 869 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 870
 871 static inline int ipv6_saddr_preferred(int type)
 872 {
 873         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 874                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 875                 return 1;
 876         return 0;
 877 }
 878
 879 /* static matching label */
 880 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
 881 {
 882  /*
 883   *     prefix (longest match)  label
 884   *     -----------------------------
 885   *     ::1/128                 0
 886   *     ::/0                    1
 887   *     2002::/16               2
 888   *     ::/96                   3
 889   *     ::ffff:0:0/96           4
 890   *     fc00::/7                5
 891   *     2001::/32               6
 892   */
 893         if (type & IPV6_ADDR_LOOPBACK)
 894                 return 0;
 895         else if (type & IPV6_ADDR_COMPATv4)
 896                 return 3;
 897         else if (type & IPV6_ADDR_MAPPED)
 898                 return 4;
 899         else if (addr->s6_addr32[0] == htonl(0x20010000))
 900                 return 6;
 901         else if (addr->s6_addr16[0] == htons(0x2002))
 902                 return 2;
 903         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 904                 return 5;
 905         return 1;
 906 }
 907
 908 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 909                        struct in6_addr *daddr, struct in6_addr *saddr)
 910 {
 911         struct ipv6_saddr_score hiscore;
 912         struct inet6_ifaddr *ifa_result = NULL;
 913         int daddr_type = __ipv6_addr_type(daddr);
 914         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 915         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 916         struct net_device *dev;
 917
 918         memset(&hiscore, 0, sizeof(hiscore));
 919
 920         read_lock(&dev_base_lock);
 921         rcu_read_lock();
 922
 923         for_each_netdev(&init_net, dev) {
 924                 struct inet6_dev *idev;
 925                 struct inet6_ifaddr *ifa;
 926
 927                 /* Rule 0: Candidate Source Address (section 4)
 928                  *  - multicast and link-local destination address,
 929                  *    the set of candidate source address MUST only
 930                  *    include addresses assigned to interfaces
 931                  *    belonging to the same link as the outgoing
 932                  *    interface.
 933                  * (- For site-local destination addresses, the
 934                  *    set of candidate source addresses MUST only
 935                  *    include addresses assigned to interfaces
 936                  *    belonging to the same site as the outgoing
 937                  *    interface.)
 938                  */
 939                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 940                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 941                     daddr_dev && dev != daddr_dev)
 942                         continue;
 943
 944                 idev = __in6_dev_get(dev);
 945                 if (!idev)
 946                         continue;
 947
 948                 read_lock_bh(&idev->lock);
 949                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 950                         struct ipv6_saddr_score score;
 951
 952                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 953
 954                         /* Rule 0:
 955                          * - Tentative Address (RFC2462 section 5.4)
 956                          *  - A tentative address is not considered
 957                          *    "assigned to an interface" in the traditional
 958                          *    sense, unless it is also flagged as optimistic.
 959                          * - Candidate Source Address (section 4)
 960                          *  - In any case, anycast addresses, multicast
 961                          *    addresses, and the unspecified address MUST
 962                          *    NOT be included in a candidate set.
 963                          */
 964                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 965                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 966                                 continue;
 967                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 968                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 969                                 LIMIT_NETDEBUG(KERN_DEBUG
 970                                                "ADDRCONF: unspecified / multicast address "
 971                                                "assigned as unicast address on %s",
 972                                                dev->name);
 973                                 continue;
 974                         }
 975
 976                         score.attrs = 0;
 977                         score.matchlen = 0;
 978                         score.scope = 0;
 979                         score.rule = 0;
 980
 981                         if (ifa_result == NULL) {
 982                                 /* record it if the first available entry */
 983                                 goto record_it;
 984                         }
 985
 986                         /* Rule 1: Prefer same address */
 987                         if (hiscore.rule < 1) {
 988                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 989                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 990                                 hiscore.rule++;
 991                         }
 992                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 993                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 994                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 995                                         score.rule = 1;
 996                                         goto record_it;
 997                                 }
 998                         } else {
 999                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1000                                         continue;
1001                         }
1002
1003                         /* Rule 2: Prefer appropriate scope */
1004                         if (hiscore.rule < 2) {
1005                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1006                                 hiscore.rule++;
1007                         }
1008                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1009                         if (hiscore.scope < score.scope) {
1010                                 if (hiscore.scope < daddr_scope) {
1011                                         score.rule = 2;
1012                                         goto record_it;
1013                                 } else
1014                                         continue;
1015                         } else if (score.scope < hiscore.scope) {
1016                                 if (score.scope < daddr_scope)
1017                                         break; /* addresses sorted by scope */
1018                                 else {
1019                                         score.rule = 2;
1020                                         goto record_it;
1021                                 }
1022                         }
1023
1024                         /* Rule 3: Avoid deprecated and optimistic addresses */
1025                         if (hiscore.rule < 3) {
1026                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1027                                    (((ifa_result->flags &
1028                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1029                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1030                                 hiscore.rule++;
1031                         }
1032                         if (ipv6_saddr_preferred(score.addr_type) ||
1033                            (((ifa->flags &
1034                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1035                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1036                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1037                                         score.rule = 3;
1038                                         goto record_it;
1039                                 }
1040                         } else {
1041                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1042                                         continue;
1043                         }
1044
1045                         /* Rule 4: Prefer home address */
1046 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1047                         if (hiscore.rule < 4) {
1048                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1049                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1050                                 hiscore.rule++;
1051                         }
1052                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1053                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1054                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1055                                         score.rule = 4;
1056                                         goto record_it;
1057                                 }
1058                         } else {
1059                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1060                                         continue;
1061                         }
1062 #else
1063                         if (hiscore.rule < 4)
1064                                 hiscore.rule++;
1065 #endif
1066
1067                         /* Rule 5: Prefer outgoing interface */
1068                         if (hiscore.rule < 5) {
1069                                 if (daddr_dev == NULL ||
1070                                     daddr_dev == ifa_result->idev->dev)
1071                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1072                                 hiscore.rule++;
1073                         }
1074                         if (daddr_dev == NULL ||
1075                             daddr_dev == ifa->idev->dev) {
1076                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1077                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1078                                         score.rule = 5;
1079                                         goto record_it;
1080                                 }
1081                         } else {
1082                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1083                                         continue;
1084                         }
1085
1086                         /* Rule 6: Prefer matching label */
1087                         if (hiscore.rule < 6) {
1088                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1089                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1090                                 hiscore.rule++;
1091                         }
1092                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1093                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095                                         score.rule = 6;
1096                                         goto record_it;
1097                                 }
1098                         } else {
1099                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100                                         continue;
1101                         }
1102
1103 #ifdef CONFIG_IPV6_PRIVACY
1104                         /* Rule 7: Prefer public address
1105                          * Note: prefer temprary address if use_tempaddr >= 2
1106                          */
1107                         if (hiscore.rule < 7) {
1108                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1110                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111                                 hiscore.rule++;
1112                         }
1113                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1115                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117                                         score.rule = 7;
1118                                         goto record_it;
1119                                 }
1120                         } else {
1121                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122                                         continue;
1123                         }
1124 #else
1125                         if (hiscore.rule < 7)
1126                                 hiscore.rule++;
1127 #endif
1128                         /* Rule 8: Use longest matching prefix */
1129                         if (hiscore.rule < 8) {
1130                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1131                                 hiscore.rule++;
1132                         }
1133                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134                         if (score.matchlen > hiscore.matchlen) {
1135                                 score.rule = 8;
1136                                 goto record_it;
1137                         }
1138 #if 0
1139                         else if (score.matchlen < hiscore.matchlen)
1140                                 continue;
1141 #endif
1142
1143                         /* Final Rule: choose first available one */
1144                         continue;
1145 record_it:
1146                         if (ifa_result)
1147                                 in6_ifa_put(ifa_result);
1148                         in6_ifa_hold(ifa);
1149                         ifa_result = ifa;
1150                         hiscore = score;
1151                 }
1152                 read_unlock_bh(&idev->lock);
1153         }
1154         rcu_read_unlock();
1155         read_unlock(&dev_base_lock);
1156
1157         if (!ifa_result)
1158                 return -EADDRNOTAVAIL;
1159
1160         ipv6_addr_copy(saddr, &ifa_result->addr);
1161         in6_ifa_put(ifa_result);
1162         return 0;
1163 }
1164
1165
1166 int ipv6_get_saddr(struct dst_entry *dst,
1167                    struct in6_addr *daddr, struct in6_addr *saddr)
1168 {
1169         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1170 }
1171
1172 EXPORT_SYMBOL(ipv6_get_saddr);
1173
1174 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175                     unsigned char banned_flags)
1176 {
1177         struct inet6_dev *idev;
1178         int err = -EADDRNOTAVAIL;
1179
1180         rcu_read_lock();
1181         if ((idev = __in6_dev_get(dev)) != NULL) {
1182                 struct inet6_ifaddr *ifp;
1183
1184                 read_lock_bh(&idev->lock);
1185                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1186                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1187                                 ipv6_addr_copy(addr, &ifp->addr);
1188                                 err = 0;
1189                                 break;
1190                         }
1191                 }
1192                 read_unlock_bh(&idev->lock);
1193         }
1194         rcu_read_unlock();
1195         return err;
1196 }
1197
1198 static int ipv6_count_addresses(struct inet6_dev *idev)
1199 {
1200         int cnt = 0;
1201         struct inet6_ifaddr *ifp;
1202
1203         read_lock_bh(&idev->lock);
1204         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1205                 cnt++;
1206         read_unlock_bh(&idev->lock);
1207         return cnt;
1208 }
1209
1210 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1211 {
1212         struct inet6_ifaddr * ifp;
1213         u8 hash = ipv6_addr_hash(addr);
1214
1215         read_lock_bh(&addrconf_hash_lock);
1216         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1217                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1218                     !(ifp->flags&IFA_F_TENTATIVE)) {
1219                         if (dev == NULL || ifp->idev->dev == dev ||
1220                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1221                                 break;
1222                 }
1223         }
1224         read_unlock_bh(&addrconf_hash_lock);
1225         return ifp != NULL;
1226 }
1227
1228 EXPORT_SYMBOL(ipv6_chk_addr);
1229
1230 static
1231 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1232 {
1233         struct inet6_ifaddr * ifp;
1234         u8 hash = ipv6_addr_hash(addr);
1235
1236         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1237                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1238                         if (dev == NULL || ifp->idev->dev == dev)
1239                                 break;
1240                 }
1241         }
1242         return ifp != NULL;
1243 }
1244
1245 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1246 {
1247         struct inet6_ifaddr * ifp;
1248         u8 hash = ipv6_addr_hash(addr);
1249
1250         read_lock_bh(&addrconf_hash_lock);
1251         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1252                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1253                         if (dev == NULL || ifp->idev->dev == dev ||
1254                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1255                                 in6_ifa_hold(ifp);
1256                                 break;
1257                         }
1258                 }
1259         }
1260         read_unlock_bh(&addrconf_hash_lock);
1261
1262         return ifp;
1263 }
1264
1265 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1266 {
1267         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1268         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1269         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1270         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1271         int sk_ipv6only = ipv6_only_sock(sk);
1272         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1273         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1274         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1275
1276         if (!sk2_rcv_saddr && !sk_ipv6only)
1277                 return 1;
1278
1279         if (addr_type2 == IPV6_ADDR_ANY &&
1280             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1281                 return 1;
1282
1283         if (addr_type == IPV6_ADDR_ANY &&
1284             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1285                 return 1;
1286
1287         if (sk2_rcv_saddr6 &&
1288             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1289                 return 1;
1290
1291         if (addr_type == IPV6_ADDR_MAPPED &&
1292             !sk2_ipv6only &&
1293             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1294                 return 1;
1295
1296         return 0;
1297 }
1298
1299 /* Gets referenced address, destroys ifaddr */
1300
1301 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1302 {
1303         if (ifp->flags&IFA_F_PERMANENT) {
1304                 spin_lock_bh(&ifp->lock);
1305                 addrconf_del_timer(ifp);
1306                 ifp->flags |= IFA_F_TENTATIVE;
1307                 spin_unlock_bh(&ifp->lock);
1308                 in6_ifa_put(ifp);
1309 #ifdef CONFIG_IPV6_PRIVACY
1310         } else if (ifp->flags&IFA_F_TEMPORARY) {
1311                 struct inet6_ifaddr *ifpub;
1312                 spin_lock_bh(&ifp->lock);
1313                 ifpub = ifp->ifpub;
1314                 if (ifpub) {
1315                         in6_ifa_hold(ifpub);
1316                         spin_unlock_bh(&ifp->lock);
1317                         ipv6_create_tempaddr(ifpub, ifp);
1318                         in6_ifa_put(ifpub);
1319                 } else {
1320                         spin_unlock_bh(&ifp->lock);
1321                 }
1322                 ipv6_del_addr(ifp);
1323 #endif
1324         } else
1325                 ipv6_del_addr(ifp);
1326 }
1327
1328 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1329 {
1330         if (net_ratelimit())
1331                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1332         addrconf_dad_stop(ifp);
1333 }
1334
1335 /* Join to solicited addr multicast group. */
1336
1337 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1338 {
1339         struct in6_addr maddr;
1340
1341         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1342                 return;
1343
1344         addrconf_addr_solict_mult(addr, &maddr);
1345         ipv6_dev_mc_inc(dev, &maddr);
1346 }
1347
1348 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1349 {
1350         struct in6_addr maddr;
1351
1352         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1353                 return;
1354
1355         addrconf_addr_solict_mult(addr, &maddr);
1356         __ipv6_dev_mc_dec(idev, &maddr);
1357 }
1358
1359 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1360 {
1361         struct in6_addr addr;
1362         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1363         if (ipv6_addr_any(&addr))
1364                 return;
1365         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1366 }
1367
1368 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1369 {
1370         struct in6_addr addr;
1371         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1372         if (ipv6_addr_any(&addr))
1373                 return;
1374         __ipv6_dev_ac_dec(ifp->idev, &addr);
1375 }
1376
1377 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1378 {
1379         if (dev->addr_len != ETH_ALEN)
1380                 return -1;
1381         memcpy(eui, dev->dev_addr, 3);
1382         memcpy(eui + 5, dev->dev_addr + 3, 3);
1383
1384         /*
1385          * The zSeries OSA network cards can be shared among various
1386          * OS instances, but the OSA cards have only one MAC address.
1387          * This leads to duplicate address conflicts in conjunction
1388          * with IPv6 if more than one instance uses the same card.
1389          *
1390          * The driver for these cards can deliver a unique 16-bit
1391          * identifier for each instance sharing the same card.  It is
1392          * placed instead of 0xFFFE in the interface identifier.  The
1393          * "u" bit of the interface identifier is not inverted in this
1394          * case.  Hence the resulting interface identifier has local
1395          * scope according to RFC2373.
1396          */
1397         if (dev->dev_id) {
1398                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1399                 eui[4] = dev->dev_id & 0xFF;
1400         } else {
1401                 eui[3] = 0xFF;
1402                 eui[4] = 0xFE;
1403                 eui[0] ^= 2;
1404         }
1405         return 0;
1406 }
1407
1408 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1409 {
1410         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1411         if (dev->addr_len != ARCNET_ALEN)
1412                 return -1;
1413         memset(eui, 0, 7);
1414         eui[7] = *(u8*)dev->dev_addr;
1415         return 0;
1416 }
1417
1418 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1419 {
1420         if (dev->addr_len != INFINIBAND_ALEN)
1421                 return -1;
1422         memcpy(eui, dev->dev_addr + 12, 8);
1423         eui[0] |= 2;
1424         return 0;
1425 }
1426
1427 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1428 {
1429         switch (dev->type) {
1430         case ARPHRD_ETHER:
1431         case ARPHRD_FDDI:
1432         case ARPHRD_IEEE802_TR:
1433                 return addrconf_ifid_eui48(eui, dev);
1434         case ARPHRD_ARCNET:
1435                 return addrconf_ifid_arcnet(eui, dev);
1436         case ARPHRD_INFINIBAND:
1437                 return addrconf_ifid_infiniband(eui, dev);
1438         }
1439         return -1;
1440 }
1441
1442 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1443 {
1444         int err = -1;
1445         struct inet6_ifaddr *ifp;
1446
1447         read_lock_bh(&idev->lock);
1448         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1449                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1450                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1451                         err = 0;
1452                         break;
1453                 }
1454         }
1455         read_unlock_bh(&idev->lock);
1456         return err;
1457 }
1458
1459 #ifdef CONFIG_IPV6_PRIVACY
1460 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1461 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1462 {
1463 regen:
1464         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1465         idev->rndid[0] &= ~0x02;
1466
1467         /*
1468          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1469          * check if generated address is not inappropriate
1470          *
1471          *  - Reserved subnet anycast (RFC 2526)
1472          *      11111101 11....11 1xxxxxxx
1473          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1474          *      00-00-5E-FE-xx-xx-xx-xx
1475          *  - value 0
1476          *  - XXX: already assigned to an address on the device
1477          */
1478         if (idev->rndid[0] == 0xfd &&
1479             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1480             (idev->rndid[7]&0x80))
1481                 goto regen;
1482         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1483                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1484                         goto regen;
1485                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1486                         goto regen;
1487         }
1488
1489         return 0;
1490 }
1491
1492 static void ipv6_regen_rndid(unsigned long data)
1493 {
1494         struct inet6_dev *idev = (struct inet6_dev *) data;
1495         unsigned long expires;
1496
1497         rcu_read_lock_bh();
1498         write_lock_bh(&idev->lock);
1499
1500         if (idev->dead)
1501                 goto out;
1502
1503         if (__ipv6_regen_rndid(idev) < 0)
1504                 goto out;
1505
1506         expires = jiffies +
1507                 idev->cnf.temp_prefered_lft * HZ -
1508                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1509         if (time_before(expires, jiffies)) {
1510                 printk(KERN_WARNING
1511                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1512                         idev->dev->name);
1513                 goto out;
1514         }
1515
1516         if (!mod_timer(&idev->regen_timer, expires))
1517                 in6_dev_hold(idev);
1518
1519 out:
1520         write_unlock_bh(&idev->lock);
1521         rcu_read_unlock_bh();
1522         in6_dev_put(idev);
1523 }
1524
1525 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1526         int ret = 0;
1527
1528         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1529                 ret = __ipv6_regen_rndid(idev);
1530         return ret;
1531 }
1532 #endif
1533
1534 /*
1535  *      Add prefix route.
1536  */
1537
1538 static void
1539 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1540                       unsigned long expires, u32 flags)
1541 {
1542         struct fib6_config cfg = {
1543                 .fc_table = RT6_TABLE_PREFIX,
1544                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1545                 .fc_ifindex = dev->ifindex,
1546                 .fc_expires = expires,
1547                 .fc_dst_len = plen,
1548                 .fc_flags = RTF_UP | flags,
1549         };
1550
1551         ipv6_addr_copy(&cfg.fc_dst, pfx);
1552
1553         /* Prevent useless cloning on PtP SIT.
1554            This thing is done here expecting that the whole
1555            class of non-broadcast devices need not cloning.
1556          */
1557 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1558         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1559                 cfg.fc_flags |= RTF_NONEXTHOP;
1560 #endif
1561
1562         ip6_route_add(&cfg);
1563 }
1564
1565 /* Create "default" multicast route to the interface */
1566
1567 static void addrconf_add_mroute(struct net_device *dev)
1568 {
1569         struct fib6_config cfg = {
1570                 .fc_table = RT6_TABLE_LOCAL,
1571                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1572                 .fc_ifindex = dev->ifindex,
1573                 .fc_dst_len = 8,
1574                 .fc_flags = RTF_UP,
1575         };
1576
1577         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1578
1579         ip6_route_add(&cfg);
1580 }
1581
1582 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1583 static void sit_route_add(struct net_device *dev)
1584 {
1585         struct fib6_config cfg = {
1586                 .fc_table = RT6_TABLE_MAIN,
1587                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1588                 .fc_ifindex = dev->ifindex,
1589                 .fc_dst_len = 96,
1590                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1591         };
1592
1593         /* prefix length - 96 bits "::d.d.d.d" */
1594         ip6_route_add(&cfg);
1595 }
1596 #endif
1597
1598 static void addrconf_add_lroute(struct net_device *dev)
1599 {
1600         struct in6_addr addr;
1601
1602         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1603         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1604 }
1605
1606 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1607 {
1608         struct inet6_dev *idev;
1609
1610         ASSERT_RTNL();
1611
1612         if ((idev = ipv6_find_idev(dev)) == NULL)
1613                 return NULL;
1614
1615         /* Add default multicast route */
1616         addrconf_add_mroute(dev);
1617
1618         /* Add link local route */
1619         addrconf_add_lroute(dev);
1620         return idev;
1621 }
1622
1623 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1624 {
1625         struct prefix_info *pinfo;
1626         __u32 valid_lft;
1627         __u32 prefered_lft;
1628         int addr_type;
1629         unsigned long rt_expires;
1630         struct inet6_dev *in6_dev;
1631
1632         pinfo = (struct prefix_info *) opt;
1633
1634         if (len < sizeof(struct prefix_info)) {
1635                 ADBG(("addrconf: prefix option too short\n"));
1636                 return;
1637         }
1638
1639         /*
1640          *      Validation checks ([ADDRCONF], page 19)
1641          */
1642
1643         addr_type = ipv6_addr_type(&pinfo->prefix);
1644
1645         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1646                 return;
1647
1648         valid_lft = ntohl(pinfo->valid);
1649         prefered_lft = ntohl(pinfo->prefered);
1650
1651         if (prefered_lft > valid_lft) {
1652                 if (net_ratelimit())
1653                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1654                 return;
1655         }
1656
1657         in6_dev = in6_dev_get(dev);
1658
1659         if (in6_dev == NULL) {
1660                 if (net_ratelimit())
1661                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1662                 return;
1663         }
1664
1665         /*
1666          *      Two things going on here:
1667          *      1) Add routes for on-link prefixes
1668          *      2) Configure prefixes with the auto flag set
1669          */
1670
1671         /* Avoid arithmetic overflow. Really, we could
1672            save rt_expires in seconds, likely valid_lft,
1673            but it would require division in fib gc, that it
1674            not good.
1675          */
1676         if (valid_lft >= 0x7FFFFFFF/HZ)
1677                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1678         else
1679                 rt_expires = valid_lft * HZ;
1680
1681         /*
1682          * We convert this (in jiffies) to clock_t later.
1683          * Avoid arithmetic overflow there as well.
1684          * Overflow can happen only if HZ < USER_HZ.
1685          */
1686         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1687                 rt_expires = 0x7FFFFFFF / USER_HZ;
1688
1689         if (pinfo->onlink) {
1690                 struct rt6_info *rt;
1691                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1692
1693                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1694                         if (rt->rt6i_flags&RTF_EXPIRES) {
1695                                 if (valid_lft == 0) {
1696                                         ip6_del_rt(rt);
1697                                         rt = NULL;
1698                                 } else {
1699                                         rt->rt6i_expires = jiffies + rt_expires;
1700                                 }
1701                         }
1702                 } else if (valid_lft) {
1703                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1704                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1705                 }
1706                 if (rt)
1707                         dst_release(&rt->u.dst);
1708         }
1709
1710         /* Try to figure out our local address for this prefix */
1711
1712         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1713                 struct inet6_ifaddr * ifp;
1714                 struct in6_addr addr;
1715                 int create = 0, update_lft = 0;
1716
1717                 if (pinfo->prefix_len == 64) {
1718                         memcpy(&addr, &pinfo->prefix, 8);
1719                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1720                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1721                                 in6_dev_put(in6_dev);
1722                                 return;
1723                         }
1724                         goto ok;
1725                 }
1726                 if (net_ratelimit())
1727                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1728                                pinfo->prefix_len);
1729                 in6_dev_put(in6_dev);
1730                 return;
1731
1732 ok:
1733
1734                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1735
1736                 if (ifp == NULL && valid_lft) {
1737                         int max_addresses = in6_dev->cnf.max_addresses;
1738                         u32 addr_flags = 0;
1739
1740 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1741                         if (in6_dev->cnf.optimistic_dad &&
1742                             !ipv6_devconf.forwarding)
1743                                 addr_flags = IFA_F_OPTIMISTIC;
1744 #endif
1745
1746                         /* Do not allow to create too much of autoconfigured
1747                          * addresses; this would be too easy way to crash kernel.
1748                          */
1749                         if (!max_addresses ||
1750                             ipv6_count_addresses(in6_dev) < max_addresses)
1751                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1752                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1753                                                     addr_flags);
1754
1755                         if (!ifp || IS_ERR(ifp)) {
1756                                 in6_dev_put(in6_dev);
1757                                 return;
1758                         }
1759
1760                         update_lft = create = 1;
1761                         ifp->cstamp = jiffies;
1762                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1763                 }
1764
1765                 if (ifp) {
1766                         int flags;
1767                         unsigned long now;
1768 #ifdef CONFIG_IPV6_PRIVACY
1769                         struct inet6_ifaddr *ift;
1770 #endif
1771                         u32 stored_lft;
1772
1773                         /* update lifetime (RFC2462 5.5.3 e) */
1774                         spin_lock(&ifp->lock);
1775                         now = jiffies;
1776                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1777                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1778                         else
1779                                 stored_lft = 0;
1780                         if (!update_lft && stored_lft) {
1781                                 if (valid_lft > MIN_VALID_LIFETIME ||
1782                                     valid_lft > stored_lft)
1783                                         update_lft = 1;
1784                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1785                                         /* valid_lft <= stored_lft is always true */
1786                                         /* XXX: IPsec */
1787                                         update_lft = 0;
1788                                 } else {
1789                                         valid_lft = MIN_VALID_LIFETIME;
1790                                         if (valid_lft < prefered_lft)
1791                                                 prefered_lft = valid_lft;
1792                                         update_lft = 1;
1793                                 }
1794                         }
1795
1796                         if (update_lft) {
1797                                 ifp->valid_lft = valid_lft;
1798                                 ifp->prefered_lft = prefered_lft;
1799                                 ifp->tstamp = now;
1800                                 flags = ifp->flags;
1801                                 ifp->flags &= ~IFA_F_DEPRECATED;
1802                                 spin_unlock(&ifp->lock);
1803
1804                                 if (!(flags&IFA_F_TENTATIVE))
1805                                         ipv6_ifa_notify(0, ifp);
1806                         } else
1807                                 spin_unlock(&ifp->lock);
1808
1809 #ifdef CONFIG_IPV6_PRIVACY
1810                         read_lock_bh(&in6_dev->lock);
1811                         /* update all temporary addresses in the list */
1812                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1813                                 /*
1814                                  * When adjusting the lifetimes of an existing
1815                                  * temporary address, only lower the lifetimes.
1816                                  * Implementations must not increase the
1817                                  * lifetimes of an existing temporary address
1818                                  * when processing a Prefix Information Option.
1819                                  */
1820                                 spin_lock(&ift->lock);
1821                                 flags = ift->flags;
1822                                 if (ift->valid_lft > valid_lft &&
1823                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1824                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1825                                 if (ift->prefered_lft > prefered_lft &&
1826                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1827                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1828                                 spin_unlock(&ift->lock);
1829                                 if (!(flags&IFA_F_TENTATIVE))
1830                                         ipv6_ifa_notify(0, ift);
1831                         }
1832
1833                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1834                                 /*
1835                                  * When a new public address is created as described in [ADDRCONF],
1836                                  * also create a new temporary address.
1837                                  */
1838                                 read_unlock_bh(&in6_dev->lock);
1839                                 ipv6_create_tempaddr(ifp, NULL);
1840                         } else {
1841                                 read_unlock_bh(&in6_dev->lock);
1842                         }
1843 #endif
1844                         in6_ifa_put(ifp);
1845                         addrconf_verify(0);
1846                 }
1847         }
1848         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1849         in6_dev_put(in6_dev);
1850 }
1851
1852 /*
1853  *      Set destination address.
1854  *      Special case for SIT interfaces where we create a new "virtual"
1855  *      device.
1856  */
1857 int addrconf_set_dstaddr(void __user *arg)
1858 {
1859         struct in6_ifreq ireq;
1860         struct net_device *dev;
1861         int err = -EINVAL;
1862
1863         rtnl_lock();
1864
1865         err = -EFAULT;
1866         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1867                 goto err_exit;
1868
1869         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1870
1871         err = -ENODEV;
1872         if (dev == NULL)
1873                 goto err_exit;
1874
1875 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1876         if (dev->type == ARPHRD_SIT) {
1877                 struct ifreq ifr;
1878                 mm_segment_t    oldfs;
1879                 struct ip_tunnel_parm p;
1880
1881                 err = -EADDRNOTAVAIL;
1882                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1883                         goto err_exit;
1884
1885                 memset(&p, 0, sizeof(p));
1886                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1887                 p.iph.saddr = 0;
1888                 p.iph.version = 4;
1889                 p.iph.ihl = 5;
1890                 p.iph.protocol = IPPROTO_IPV6;
1891                 p.iph.ttl = 64;
1892                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1893
1894                 oldfs = get_fs(); set_fs(KERNEL_DS);
1895                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1896                 set_fs(oldfs);
1897
1898                 if (err == 0) {
1899                         err = -ENOBUFS;
1900                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1901                                 goto err_exit;
1902                         err = dev_open(dev);
1903                 }
1904         }
1905 #endif
1906
1907 err_exit:
1908         rtnl_unlock();
1909         return err;
1910 }
1911
1912 /*
1913  *      Manual configuration of address on an interface
1914  */
1915 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1916                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1917 {
1918         struct inet6_ifaddr *ifp;
1919         struct inet6_dev *idev;
1920         struct net_device *dev;
1921         int scope;
1922         u32 flags = RTF_EXPIRES;
1923
1924         ASSERT_RTNL();
1925
1926         /* check the lifetime */
1927         if (!valid_lft || prefered_lft > valid_lft)
1928                 return -EINVAL;
1929
1930         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1931                 return -ENODEV;
1932
1933         if ((idev = addrconf_add_dev(dev)) == NULL)
1934                 return -ENOBUFS;
1935
1936         scope = ipv6_addr_scope(pfx);
1937
1938         if (valid_lft == INFINITY_LIFE_TIME) {
1939                 ifa_flags |= IFA_F_PERMANENT;
1940                 flags = 0;
1941         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1942                 valid_lft = 0x7FFFFFFF/HZ;
1943
1944         if (prefered_lft == 0)
1945                 ifa_flags |= IFA_F_DEPRECATED;
1946         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1947                  (prefered_lft != INFINITY_LIFE_TIME))
1948                 prefered_lft = 0x7FFFFFFF/HZ;
1949
1950         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1951
1952         if (!IS_ERR(ifp)) {
1953                 spin_lock_bh(&ifp->lock);
1954                 ifp->valid_lft = valid_lft;
1955                 ifp->prefered_lft = prefered_lft;
1956                 ifp->tstamp = jiffies;
1957                 spin_unlock_bh(&ifp->lock);
1958
1959                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1960                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1961                 /*
1962                  * Note that section 3.1 of RFC 4429 indicates
1963                  * that the Optimistic flag should not be set for
1964                  * manually configured addresses
1965                  */
1966                 addrconf_dad_start(ifp, 0);
1967                 in6_ifa_put(ifp);
1968                 addrconf_verify(0);
1969                 return 0;
1970         }
1971
1972         return PTR_ERR(ifp);
1973 }
1974
1975 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1976 {
1977         struct inet6_ifaddr *ifp;
1978         struct inet6_dev *idev;
1979         struct net_device *dev;
1980
1981         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1982                 return -ENODEV;
1983
1984         if ((idev = __in6_dev_get(dev)) == NULL)
1985                 return -ENXIO;
1986
1987         read_lock_bh(&idev->lock);
1988         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1989                 if (ifp->prefix_len == plen &&
1990                     ipv6_addr_equal(pfx, &ifp->addr)) {
1991                         in6_ifa_hold(ifp);
1992                         read_unlock_bh(&idev->lock);
1993
1994                         ipv6_del_addr(ifp);
1995
1996                         /* If the last address is deleted administratively,
1997                            disable IPv6 on this interface.
1998                          */
1999                         if (idev->addr_list == NULL)
2000                                 addrconf_ifdown(idev->dev, 1);
2001                         return 0;
2002                 }
2003         }
2004         read_unlock_bh(&idev->lock);
2005         return -EADDRNOTAVAIL;
2006 }
2007
2008
2009 int addrconf_add_ifaddr(void __user *arg)
2010 {
2011         struct in6_ifreq ireq;
2012         int err;
2013
2014         if (!capable(CAP_NET_ADMIN))
2015                 return -EPERM;
2016
2017         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2018                 return -EFAULT;
2019
2020         rtnl_lock();
2021         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2022                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2023         rtnl_unlock();
2024         return err;
2025 }
2026
2027 int addrconf_del_ifaddr(void __user *arg)
2028 {
2029         struct in6_ifreq ireq;
2030         int err;
2031
2032         if (!capable(CAP_NET_ADMIN))
2033                 return -EPERM;
2034
2035         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2036                 return -EFAULT;
2037
2038         rtnl_lock();
2039         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2040         rtnl_unlock();
2041         return err;
2042 }
2043
2044 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2045 static void sit_add_v4_addrs(struct inet6_dev *idev)
2046 {
2047         struct inet6_ifaddr * ifp;
2048         struct in6_addr addr;
2049         struct net_device *dev;
2050         int scope;
2051
2052         ASSERT_RTNL();
2053
2054         memset(&addr, 0, sizeof(struct in6_addr));
2055         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2056
2057         if (idev->dev->flags&IFF_POINTOPOINT) {
2058                 addr.s6_addr32[0] = htonl(0xfe800000);
2059                 scope = IFA_LINK;
2060         } else {
2061                 scope = IPV6_ADDR_COMPATv4;
2062         }
2063
2064         if (addr.s6_addr32[3]) {
2065                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2066                 if (!IS_ERR(ifp)) {
2067                         spin_lock_bh(&ifp->lock);
2068                         ifp->flags &= ~IFA_F_TENTATIVE;
2069                         spin_unlock_bh(&ifp->lock);
2070                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2071                         in6_ifa_put(ifp);
2072                 }
2073                 return;
2074         }
2075
2076         for_each_netdev(&init_net, dev) {
2077                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2078                 if (in_dev && (dev->flags & IFF_UP)) {
2079                         struct in_ifaddr * ifa;
2080
2081                         int flag = scope;
2082
2083                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2084                                 int plen;
2085
2086                                 addr.s6_addr32[3] = ifa->ifa_local;
2087
2088                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2089                                         continue;
2090                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2091                                         if (idev->dev->flags&IFF_POINTOPOINT)
2092                                                 continue;
2093                                         flag |= IFA_HOST;
2094                                 }
2095                                 if (idev->dev->flags&IFF_POINTOPOINT)
2096                                         plen = 64;
2097                                 else
2098                                         plen = 96;
2099
2100                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2101                                                     IFA_F_PERMANENT);
2102                                 if (!IS_ERR(ifp)) {
2103                                         spin_lock_bh(&ifp->lock);
2104                                         ifp->flags &= ~IFA_F_TENTATIVE;
2105                                         spin_unlock_bh(&ifp->lock);
2106                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2107                                         in6_ifa_put(ifp);
2108                                 }
2109                         }
2110                 }
2111         }
2112 }
2113 #endif
2114
2115 static void init_loopback(struct net_device *dev)
2116 {
2117         struct inet6_dev  *idev;
2118         struct inet6_ifaddr * ifp;
2119
2120         /* ::1 */
2121
2122         ASSERT_RTNL();
2123
2124         if ((idev = ipv6_find_idev(dev)) == NULL) {
2125                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2126                 return;
2127         }
2128
2129         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2130         if (!IS_ERR(ifp)) {
2131                 spin_lock_bh(&ifp->lock);
2132                 ifp->flags &= ~IFA_F_TENTATIVE;
2133                 spin_unlock_bh(&ifp->lock);
2134                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2135                 in6_ifa_put(ifp);
2136         }
2137 }
2138
2139 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2140 {
2141         struct inet6_ifaddr * ifp;
2142         u32 addr_flags = IFA_F_PERMANENT;
2143
2144 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2145         if (idev->cnf.optimistic_dad &&
2146             !ipv6_devconf.forwarding)
2147                 addr_flags |= IFA_F_OPTIMISTIC;
2148 #endif
2149
2150
2151         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2152         if (!IS_ERR(ifp)) {
2153                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2154                 addrconf_dad_start(ifp, 0);
2155                 in6_ifa_put(ifp);
2156         }
2157 }
2158
2159 static void addrconf_dev_config(struct net_device *dev)
2160 {
2161         struct in6_addr addr;
2162         struct inet6_dev    * idev;
2163
2164         ASSERT_RTNL();
2165
2166         if ((dev->type != ARPHRD_ETHER) &&
2167             (dev->type != ARPHRD_FDDI) &&
2168             (dev->type != ARPHRD_IEEE802_TR) &&
2169             (dev->type != ARPHRD_ARCNET) &&
2170             (dev->type != ARPHRD_INFINIBAND)) {
2171                 /* Alas, we support only Ethernet autoconfiguration. */
2172                 return;
2173         }
2174
2175         idev = addrconf_add_dev(dev);
2176         if (idev == NULL)
2177                 return;
2178
2179         memset(&addr, 0, sizeof(struct in6_addr));
2180         addr.s6_addr32[0] = htonl(0xFE800000);
2181
2182         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2183                 addrconf_add_linklocal(idev, &addr);
2184 }
2185
2186 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2187 static void addrconf_sit_config(struct net_device *dev)
2188 {
2189         struct inet6_dev *idev;
2190
2191         ASSERT_RTNL();
2192
2193         /*
2194          * Configure the tunnel with one of our IPv4
2195          * addresses... we should configure all of
2196          * our v4 addrs in the tunnel
2197          */
2198
2199         if ((idev = ipv6_find_idev(dev)) == NULL) {
2200                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2201                 return;
2202         }
2203
2204         sit_add_v4_addrs(idev);
2205
2206         if (dev->flags&IFF_POINTOPOINT) {
2207                 addrconf_add_mroute(dev);
2208                 addrconf_add_lroute(dev);
2209         } else
2210                 sit_route_add(dev);
2211 }
2212 #endif
2213
2214 static inline int
2215 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2216 {
2217         struct in6_addr lladdr;
2218
2219         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2220                 addrconf_add_linklocal(idev, &lladdr);
2221                 return 0;
2222         }
2223         return -1;
2224 }
2225
2226 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2227 {
2228         struct net_device *link_dev;
2229
2230         /* first try to inherit the link-local address from the link device */
2231         if (idev->dev->iflink &&
2232             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2233                 if (!ipv6_inherit_linklocal(idev, link_dev))
2234                         return;
2235         }
2236         /* then try to inherit it from any device */
2237         for_each_netdev(&init_net, link_dev) {
2238                 if (!ipv6_inherit_linklocal(idev, link_dev))
2239                         return;
2240         }
2241         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2242 }
2243
2244 /*
2245  * Autoconfigure tunnel with a link-local address so routing protocols,
2246  * DHCPv6, MLD etc. can be run over the virtual link
2247  */
2248
2249 static void addrconf_ip6_tnl_config(struct net_device *dev)
2250 {
2251         struct inet6_dev *idev;
2252
2253         ASSERT_RTNL();
2254
2255         if ((idev = addrconf_add_dev(dev)) == NULL) {
2256                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2257                 return;
2258         }
2259         ip6_tnl_add_linklocal(idev);
2260 }
2261
2262 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2263                            void * data)
2264 {
2265         struct net_device *dev = (struct net_device *) data;
2266         struct inet6_dev *idev = __in6_dev_get(dev);
2267         int run_pending = 0;
2268         int err;
2269
2270         if (dev->nd_net != &init_net)
2271                 return NOTIFY_DONE;
2272
2273         switch(event) {
2274         case NETDEV_REGISTER:
2275                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2276                         idev = ipv6_add_dev(dev);
2277                         if (!idev)
2278                                 return notifier_from_errno(-ENOMEM);
2279                 }
2280                 break;
2281         case NETDEV_UP:
2282         case NETDEV_CHANGE:
2283                 if (dev->flags & IFF_SLAVE)
2284                         break;
2285
2286                 if (event == NETDEV_UP) {
2287                         if (!addrconf_qdisc_ok(dev)) {
2288                                 /* device is not ready yet. */
2289                                 printk(KERN_INFO
2290                                         "ADDRCONF(NETDEV_UP): %s: "
2291                                         "link is not ready\n",
2292                                         dev->name);
2293                                 break;
2294                         }
2295
2296                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2297                                 idev = ipv6_add_dev(dev);
2298
2299                         if (idev)
2300                                 idev->if_flags |= IF_READY;
2301                 } else {
2302                         if (!addrconf_qdisc_ok(dev)) {
2303                                 /* device is still not ready. */
2304                                 break;
2305                         }
2306
2307                         if (idev) {
2308                                 if (idev->if_flags & IF_READY) {
2309                                         /* device is already configured. */
2310                                         break;
2311                                 }
2312                                 idev->if_flags |= IF_READY;
2313                         }
2314
2315                         printk(KERN_INFO
2316                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2317                                         "link becomes ready\n",
2318                                         dev->name);
2319
2320                         run_pending = 1;
2321                 }
2322
2323                 switch(dev->type) {
2324 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2325                 case ARPHRD_SIT:
2326                         addrconf_sit_config(dev);
2327                         break;
2328 #endif
2329                 case ARPHRD_TUNNEL6:
2330                         addrconf_ip6_tnl_config(dev);
2331                         break;
2332                 case ARPHRD_LOOPBACK:
2333                         init_loopback(dev);
2334                         break;
2335
2336                 default:
2337                         addrconf_dev_config(dev);
2338                         break;
2339                 }
2340                 if (idev) {
2341                         if (run_pending)
2342                                 addrconf_dad_run(idev);
2343
2344                         /* If the MTU changed during the interface down, when the
2345                            interface up, the changed MTU must be reflected in the
2346                            idev as well as routers.
2347                          */
2348                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2349                                 rt6_mtu_change(dev, dev->mtu);
2350                                 idev->cnf.mtu6 = dev->mtu;
2351                         }
2352                         idev->tstamp = jiffies;
2353                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2354                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2355                            stop IPv6 on this interface.
2356                          */
2357                         if (dev->mtu < IPV6_MIN_MTU)
2358                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2359                 }
2360                 break;
2361
2362         case NETDEV_CHANGEMTU:
2363                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2364                         rt6_mtu_change(dev, dev->mtu);
2365                         idev->cnf.mtu6 = dev->mtu;
2366                         break;
2367                 }
2368
2369                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2370                         idev = ipv6_add_dev(dev);
2371                         if (idev)
2372                                 break;
2373                 }
2374
2375                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2376
2377         case NETDEV_DOWN:
2378         case NETDEV_UNREGISTER:
2379                 /*
2380                  *      Remove all addresses from this interface.
2381                  */
2382                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2383                 break;
2384
2385         case NETDEV_CHANGENAME:
2386                 if (idev) {
2387                         snmp6_unregister_dev(idev);
2388 #ifdef CONFIG_SYSCTL
2389                         addrconf_sysctl_unregister(&idev->cnf);
2390                         neigh_sysctl_unregister(idev->nd_parms);
2391                         neigh_sysctl_register(dev, idev->nd_parms,
2392                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2393                                               &ndisc_ifinfo_sysctl_change,
2394                                               NULL);
2395                         addrconf_sysctl_register(idev, &idev->cnf);
2396 #endif
2397                         err = snmp6_register_dev(idev);
2398                         if (err)
2399                                 return notifier_from_errno(err);
2400                 }
2401                 break;
2402         }
2403
2404         return NOTIFY_OK;
2405 }
2406
2407 /*
2408  *      addrconf module should be notified of a device going up
2409  */
2410 static struct notifier_block ipv6_dev_notf = {
2411         .notifier_call = addrconf_notify,
2412         .priority = 0
2413 };
2414
2415 static int addrconf_ifdown(struct net_device *dev, int how)
2416 {
2417         struct inet6_dev *idev;
2418         struct inet6_ifaddr *ifa, **bifa;
2419         int i;
2420
2421         ASSERT_RTNL();
2422
2423         if (dev == init_net.loopback_dev && how == 1)
2424                 how = 0;
2425
2426         rt6_ifdown(dev);
2427         neigh_ifdown(&nd_tbl, dev);
2428
2429         idev = __in6_dev_get(dev);
2430         if (idev == NULL)
2431                 return -ENODEV;
2432
2433         /* Step 1: remove reference to ipv6 device from parent device.
2434                    Do not dev_put!
2435          */
2436         if (how == 1) {
2437                 idev->dead = 1;
2438
2439                 /* protected by rtnl_lock */
2440                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2441
2442                 /* Step 1.5: remove snmp6 entry */
2443                 snmp6_unregister_dev(idev);
2444
2445         }
2446
2447         /* Step 2: clear hash table */
2448         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2449                 bifa = &inet6_addr_lst[i];
2450
2451                 write_lock_bh(&addrconf_hash_lock);
2452                 while ((ifa = *bifa) != NULL) {
2453                         if (ifa->idev == idev) {
2454                                 *bifa = ifa->lst_next;
2455                                 ifa->lst_next = NULL;
2456                                 addrconf_del_timer(ifa);
2457                                 in6_ifa_put(ifa);
2458                                 continue;
2459                         }
2460                         bifa = &ifa->lst_next;
2461                 }
2462                 write_unlock_bh(&addrconf_hash_lock);
2463         }
2464
2465         write_lock_bh(&idev->lock);
2466
2467         /* Step 3: clear flags for stateless addrconf */
2468         if (how != 1)
2469                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2470
2471         /* Step 4: clear address list */
2472 #ifdef CONFIG_IPV6_PRIVACY
2473         if (how == 1 && del_timer(&idev->regen_timer))
2474                 in6_dev_put(idev);
2475
2476         /* clear tempaddr list */
2477         while ((ifa = idev->tempaddr_list) != NULL) {
2478                 idev->tempaddr_list = ifa->tmp_next;
2479                 ifa->tmp_next = NULL;
2480                 ifa->dead = 1;
2481                 write_unlock_bh(&idev->lock);
2482                 spin_lock_bh(&ifa->lock);
2483
2484                 if (ifa->ifpub) {
2485                         in6_ifa_put(ifa->ifpub);
2486                         ifa->ifpub = NULL;
2487                 }
2488                 spin_unlock_bh(&ifa->lock);
2489                 in6_ifa_put(ifa);
2490                 write_lock_bh(&idev->lock);
2491         }
2492 #endif
2493         while ((ifa = idev->addr_list) != NULL) {
2494                 idev->addr_list = ifa->if_next;
2495                 ifa->if_next = NULL;
2496                 ifa->dead = 1;
2497                 addrconf_del_timer(ifa);
2498                 write_unlock_bh(&idev->lock);
2499
2500                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2501                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2502                 in6_ifa_put(ifa);
2503
2504                 write_lock_bh(&idev->lock);
2505         }
2506         write_unlock_bh(&idev->lock);
2507
2508         /* Step 5: Discard multicast list */
2509
2510         if (how == 1)
2511                 ipv6_mc_destroy_dev(idev);
2512         else
2513                 ipv6_mc_down(idev);
2514
2515         idev->tstamp = jiffies;
2516
2517         /* Shot the device (if unregistered) */
2518
2519         if (how == 1) {
2520 #ifdef CONFIG_SYSCTL
2521                 addrconf_sysctl_unregister(&idev->cnf);
2522                 neigh_sysctl_unregister(idev->nd_parms);
2523 #endif
2524                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2525                 neigh_ifdown(&nd_tbl, dev);
2526                 in6_dev_put(idev);
2527         }
2528         return 0;
2529 }
2530
2531 static void addrconf_rs_timer(unsigned long data)
2532 {
2533         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2534
2535         if (ifp->idev->cnf.forwarding)
2536                 goto out;
2537
2538         if (ifp->idev->if_flags & IF_RA_RCVD) {
2539                 /*
2540                  *      Announcement received after solicitation
2541                  *      was sent
2542                  */
2543                 goto out;
2544         }
2545
2546         spin_lock(&ifp->lock);
2547         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2548                 struct in6_addr all_routers;
2549
2550                 /* The wait after the last probe can be shorter */
2551                 addrconf_mod_timer(ifp, AC_RS,
2552                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2553                                    ifp->idev->cnf.rtr_solicit_delay :
2554                                    ifp->idev->cnf.rtr_solicit_interval);
2555                 spin_unlock(&ifp->lock);
2556
2557                 ipv6_addr_all_routers(&all_routers);
2558
2559                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2560         } else {
2561                 spin_unlock(&ifp->lock);
2562                 /*
2563                  * Note: we do not support deprecated "all on-link"
2564                  * assumption any longer.
2565                  */
2566                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2567                        ifp->idev->dev->name);
2568         }
2569
2570 out:
2571         in6_ifa_put(ifp);
2572 }
2573
2574 /*
2575  *      Duplicate Address Detection
2576  */
2577 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2578 {
2579         unsigned long rand_num;
2580         struct inet6_dev *idev = ifp->idev;
2581
2582         if (ifp->flags & IFA_F_OPTIMISTIC)
2583                 rand_num = 0;
2584         else
2585                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2586
2587         ifp->probes = idev->cnf.dad_transmits;
2588         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2589 }
2590
2591 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2592 {
2593         struct inet6_dev *idev = ifp->idev;
2594         struct net_device *dev = idev->dev;
2595
2596         addrconf_join_solict(dev, &ifp->addr);
2597
2598         net_srandom(ifp->addr.s6_addr32[3]);
2599
2600         read_lock_bh(&idev->lock);
2601         if (ifp->dead)
2602                 goto out;
2603         spin_lock_bh(&ifp->lock);
2604
2605         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2606             !(ifp->flags&IFA_F_TENTATIVE) ||
2607             ifp->flags & IFA_F_NODAD) {
2608                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2609                 spin_unlock_bh(&ifp->lock);
2610                 read_unlock_bh(&idev->lock);
2611
2612                 addrconf_dad_completed(ifp);
2613                 return;
2614         }
2615
2616         if (!(idev->if_flags & IF_READY)) {
2617                 spin_unlock_bh(&ifp->lock);
2618                 read_unlock_bh(&idev->lock);
2619                 /*
2620                  * If the defice is not ready:
2621                  * - keep it tentative if it is a permanent address.
2622                  * - otherwise, kill it.
2623                  */
2624                 in6_ifa_hold(ifp);
2625                 addrconf_dad_stop(ifp);
2626                 return;
2627         }
2628
2629         /*
2630          * Optimistic nodes can start receiving
2631          * Frames right away
2632          */
2633         if(ifp->flags & IFA_F_OPTIMISTIC)
2634                 ip6_ins_rt(ifp->rt);
2635
2636         addrconf_dad_kick(ifp);
2637         spin_unlock_bh(&ifp->lock);
2638 out:
2639         read_unlock_bh(&idev->lock);
2640 }
2641
2642 static void addrconf_dad_timer(unsigned long data)
2643 {
2644         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2645         struct inet6_dev *idev = ifp->idev;
2646         struct in6_addr unspec;
2647         struct in6_addr mcaddr;
2648
2649         read_lock_bh(&idev->lock);
2650         if (idev->dead) {
2651                 read_unlock_bh(&idev->lock);
2652                 goto out;
2653         }
2654         spin_lock_bh(&ifp->lock);
2655         if (ifp->probes == 0) {
2656                 /*
2657                  * DAD was successful
2658                  */
2659
2660                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2661                 spin_unlock_bh(&ifp->lock);
2662                 read_unlock_bh(&idev->lock);
2663
2664                 addrconf_dad_completed(ifp);
2665
2666                 goto out;
2667         }
2668
2669         ifp->probes--;
2670         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2671         spin_unlock_bh(&ifp->lock);
2672         read_unlock_bh(&idev->lock);
2673
2674         /* send a neighbour solicitation for our addr */
2675         memset(&unspec, 0, sizeof(unspec));
2676         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2677         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2678 out:
2679         in6_ifa_put(ifp);
2680 }
2681
2682 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2683 {
2684         struct net_device *     dev = ifp->idev->dev;
2685
2686         /*
2687          *      Configure the address for reception. Now it is valid.
2688          */
2689
2690         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2691
2692         /* If added prefix is link local and forwarding is off,
2693            start sending router solicitations.
2694          */
2695
2696         if (ifp->idev->cnf.forwarding == 0 &&
2697             ifp->idev->cnf.rtr_solicits > 0 &&
2698             (dev->flags&IFF_LOOPBACK) == 0 &&
2699             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2700                 struct in6_addr all_routers;
2701
2702                 ipv6_addr_all_routers(&all_routers);
2703
2704                 /*
2705                  *      If a host as already performed a random delay
2706                  *      [...] as part of DAD [...] there is no need
2707                  *      to delay again before sending the first RS
2708                  */
2709                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2710
2711                 spin_lock_bh(&ifp->lock);
2712                 ifp->probes = 1;
2713                 ifp->idev->if_flags |= IF_RS_SENT;
2714                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2715                 spin_unlock_bh(&ifp->lock);
2716         }
2717 }
2718
2719 static void addrconf_dad_run(struct inet6_dev *idev) {
2720         struct inet6_ifaddr *ifp;
2721
2722         read_lock_bh(&idev->lock);
2723         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2724                 spin_lock_bh(&ifp->lock);
2725                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2726                         spin_unlock_bh(&ifp->lock);
2727                         continue;
2728                 }
2729                 spin_unlock_bh(&ifp->lock);
2730                 addrconf_dad_kick(ifp);
2731         }
2732         read_unlock_bh(&idev->lock);
2733 }
2734
2735 #ifdef CONFIG_PROC_FS
2736 struct if6_iter_state {
2737         int bucket;
2738 };
2739
2740 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2741 {
2742         struct inet6_ifaddr *ifa = NULL;
2743         struct if6_iter_state *state = seq->private;
2744
2745         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2746                 ifa = inet6_addr_lst[state->bucket];
2747                 if (ifa)
2748                         break;
2749         }
2750         return ifa;
2751 }
2752
2753 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2754 {
2755         struct if6_iter_state *state = seq->private;
2756
2757         ifa = ifa->lst_next;
2758 try_again:
2759         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2760                 ifa = inet6_addr_lst[state->bucket];
2761                 goto try_again;
2762         }
2763         return ifa;
2764 }
2765
2766 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2767 {
2768         struct inet6_ifaddr *ifa = if6_get_first(seq);
2769
2770         if (ifa)
2771                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2772                         --pos;
2773         return pos ? NULL : ifa;
2774 }
2775
2776 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2777 {
2778         read_lock_bh(&addrconf_hash_lock);
2779         return if6_get_idx(seq, *pos);
2780 }
2781
2782 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2783 {
2784         struct inet6_ifaddr *ifa;
2785
2786         ifa = if6_get_next(seq, v);
2787         ++*pos;
2788         return ifa;
2789 }
2790
2791 static void if6_seq_stop(struct seq_file *seq, void *v)
2792 {
2793         read_unlock_bh(&addrconf_hash_lock);
2794 }
2795
2796 static int if6_seq_show(struct seq_file *seq, void *v)
2797 {
2798         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2799         seq_printf(seq,
2800                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2801                    NIP6(ifp->addr),
2802                    ifp->idev->dev->ifindex,
2803                    ifp->prefix_len,
2804                    ifp->scope,
2805                    ifp->flags,
2806                    ifp->idev->dev->name);
2807         return 0;
2808 }
2809
2810 static const struct seq_operations if6_seq_ops = {
2811         .start  = if6_seq_start,
2812         .next   = if6_seq_next,
2813         .show   = if6_seq_show,
2814         .stop   = if6_seq_stop,
2815 };
2816
2817 static int if6_seq_open(struct inode *inode, struct file *file)
2818 {
2819         return seq_open_private(file, &if6_seq_ops,
2820                         sizeof(struct if6_iter_state));
2821 }
2822
2823 static const struct file_operations if6_fops = {
2824         .owner          = THIS_MODULE,
2825         .open           = if6_seq_open,
2826         .read           = seq_read,
2827         .llseek         = seq_lseek,
2828         .release        = seq_release_private,
2829 };
2830
2831 int __init if6_proc_init(void)
2832 {
2833         if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2834                 return -ENOMEM;
2835         return 0;
2836 }
2837
2838 void if6_proc_exit(void)
2839 {
2840         proc_net_remove(&init_net, "if_inet6");
2841 }
2842 #endif  /* CONFIG_PROC_FS */
2843
2844 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2845 /* Check if address is a home address configured on any interface. */
2846 int ipv6_chk_home_addr(struct in6_addr *addr)
2847 {
2848         int ret = 0;
2849         struct inet6_ifaddr * ifp;
2850         u8 hash = ipv6_addr_hash(addr);
2851         read_lock_bh(&addrconf_hash_lock);
2852         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2853                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2854                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2855                         ret = 1;
2856                         break;
2857                 }
2858         }
2859         read_unlock_bh(&addrconf_hash_lock);
2860         return ret;
2861 }
2862 #endif
2863
2864 /*
2865  *      Periodic address status verification
2866  */
2867
2868 static void addrconf_verify(unsigned long foo)
2869 {
2870         struct inet6_ifaddr *ifp;
2871         unsigned long now, next;
2872         int i;
2873
2874         spin_lock_bh(&addrconf_verify_lock);
2875         now = jiffies;
2876         next = now + ADDR_CHECK_FREQUENCY;
2877
2878         del_timer(&addr_chk_timer);
2879
2880         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2881
2882 restart:
2883                 read_lock(&addrconf_hash_lock);
2884                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2885                         unsigned long age;
2886 #ifdef CONFIG_IPV6_PRIVACY
2887                         unsigned long regen_advance;
2888 #endif
2889
2890                         if (ifp->flags & IFA_F_PERMANENT)
2891                                 continue;
2892
2893                         spin_lock(&ifp->lock);
2894                         age = (now - ifp->tstamp) / HZ;
2895
2896 #ifdef CONFIG_IPV6_PRIVACY
2897                         regen_advance = ifp->idev->cnf.regen_max_retry *
2898                                         ifp->idev->cnf.dad_transmits *
2899                                         ifp->idev->nd_parms->retrans_time / HZ;
2900 #endif
2901
2902                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2903                             age >= ifp->valid_lft) {
2904                                 spin_unlock(&ifp->lock);
2905                                 in6_ifa_hold(ifp);
2906                                 read_unlock(&addrconf_hash_lock);
2907                                 ipv6_del_addr(ifp);
2908                                 goto restart;
2909                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2910                                 spin_unlock(&ifp->lock);
2911                                 continue;
2912                         } else if (age >= ifp->prefered_lft) {
2913                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2914                                 int deprecate = 0;
2915
2916                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2917                                         deprecate = 1;
2918                                         ifp->flags |= IFA_F_DEPRECATED;
2919                                 }
2920
2921                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2922                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2923
2924                                 spin_unlock(&ifp->lock);
2925
2926                                 if (deprecate) {
2927                                         in6_ifa_hold(ifp);
2928                                         read_unlock(&addrconf_hash_lock);
2929
2930                                         ipv6_ifa_notify(0, ifp);
2931                                         in6_ifa_put(ifp);
2932                                         goto restart;
2933                                 }
2934 #ifdef CONFIG_IPV6_PRIVACY
2935                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2936                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2937                                 if (age >= ifp->prefered_lft - regen_advance) {
2938                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2939                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2940                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2941                                         if (!ifp->regen_count && ifpub) {
2942                                                 ifp->regen_count++;
2943                                                 in6_ifa_hold(ifp);
2944                                                 in6_ifa_hold(ifpub);
2945                                                 spin_unlock(&ifp->lock);
2946                                                 read_unlock(&addrconf_hash_lock);
2947                                                 spin_lock(&ifpub->lock);
2948                                                 ifpub->regen_count = 0;
2949                                                 spin_unlock(&ifpub->lock);
2950                                                 ipv6_create_tempaddr(ifpub, ifp);
2951                                                 in6_ifa_put(ifpub);
2952                                                 in6_ifa_put(ifp);
2953                                                 goto restart;
2954                                         }
2955                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2956                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2957                                 spin_unlock(&ifp->lock);
2958 #endif
2959                         } else {
2960                                 /* ifp->prefered_lft <= ifp->valid_lft */
2961                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2962                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2963                                 spin_unlock(&ifp->lock);
2964                         }
2965                 }
2966                 read_unlock(&addrconf_hash_lock);
2967         }
2968
2969         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2970         add_timer(&addr_chk_timer);
2971         spin_unlock_bh(&addrconf_verify_lock);
2972 }
2973
2974 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2975 {
2976         struct in6_addr *pfx = NULL;
2977
2978         if (addr)
2979                 pfx = nla_data(addr);
2980
2981         if (local) {
2982                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2983                         pfx = NULL;
2984                 else
2985                         pfx = nla_data(local);
2986         }
2987
2988         return pfx;
2989 }
2990
2991 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2992         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2993         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2994         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2995 };
2996
2997 static int
2998 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2999 {
3000         struct ifaddrmsg *ifm;
3001         struct nlattr *tb[IFA_MAX+1];
3002         struct in6_addr *pfx;
3003         int err;
3004
3005         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3006         if (err < 0)
3007                 return err;
3008
3009         ifm = nlmsg_data(nlh);
3010         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3011         if (pfx == NULL)
3012                 return -EINVAL;
3013
3014         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3015 }
3016
3017 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3018                              u32 prefered_lft, u32 valid_lft)
3019 {
3020         u32 flags = RTF_EXPIRES;
3021
3022         if (!valid_lft || (prefered_lft > valid_lft))
3023                 return -EINVAL;
3024
3025         if (valid_lft == INFINITY_LIFE_TIME) {
3026                 ifa_flags |= IFA_F_PERMANENT;
3027                 flags = 0;
3028         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3029                 valid_lft = 0x7FFFFFFF/HZ;
3030
3031         if (prefered_lft == 0)
3032                 ifa_flags |= IFA_F_DEPRECATED;
3033         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3034                  (prefered_lft != INFINITY_LIFE_TIME))
3035                 prefered_lft = 0x7FFFFFFF/HZ;
3036
3037         spin_lock_bh(&ifp->lock);
3038         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3039         ifp->tstamp = jiffies;
3040         ifp->valid_lft = valid_lft;
3041         ifp->prefered_lft = prefered_lft;
3042
3043         spin_unlock_bh(&ifp->lock);
3044         if (!(ifp->flags&IFA_F_TENTATIVE))
3045                 ipv6_ifa_notify(0, ifp);
3046
3047         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3048                               jiffies_to_clock_t(valid_lft * HZ), flags);
3049         addrconf_verify(0);
3050
3051         return 0;
3052 }
3053
3054 static int
3055 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3056 {
3057         struct ifaddrmsg *ifm;
3058         struct nlattr *tb[IFA_MAX+1];
3059         struct in6_addr *pfx;
3060         struct inet6_ifaddr *ifa;
3061         struct net_device *dev;
3062         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3063         u8 ifa_flags;
3064         int err;
3065
3066         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3067         if (err < 0)
3068                 return err;
3069
3070         ifm = nlmsg_data(nlh);
3071         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3072         if (pfx == NULL)
3073                 return -EINVAL;
3074
3075         if (tb[IFA_CACHEINFO]) {
3076                 struct ifa_cacheinfo *ci;
3077
3078                 ci = nla_data(tb[IFA_CACHEINFO]);
3079                 valid_lft = ci->ifa_valid;
3080                 preferred_lft = ci->ifa_prefered;
3081         } else {
3082                 preferred_lft = INFINITY_LIFE_TIME;
3083                 valid_lft = INFINITY_LIFE_TIME;
3084         }
3085
3086         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3087         if (dev == NULL)
3088                 return -ENODEV;
3089
3090         /* We ignore other flags so far. */
3091         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3092
3093         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3094         if (ifa == NULL) {
3095                 /*
3096                  * It would be best to check for !NLM_F_CREATE here but
3097                  * userspace alreay relies on not having to provide this.
3098                  */
3099                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3100                                       ifa_flags, preferred_lft, valid_lft);
3101         }
3102
3103         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3104             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3105                 err = -EEXIST;
3106         else
3107                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3108
3109         in6_ifa_put(ifa);
3110
3111         return err;
3112 }
3113
3114 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3115                           u8 scope, int ifindex)
3116 {
3117         struct ifaddrmsg *ifm;
3118
3119         ifm = nlmsg_data(nlh);
3120         ifm->ifa_family = AF_INET6;
3121         ifm->ifa_prefixlen = prefixlen;
3122         ifm->ifa_flags = flags;
3123         ifm->ifa_scope = scope;
3124         ifm->ifa_index = ifindex;
3125 }
3126
3127 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3128                          unsigned long tstamp, u32 preferred, u32 valid)
3129 {
3130         struct ifa_cacheinfo ci;
3131
3132         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3133                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3134         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3135                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3136         ci.ifa_prefered = preferred;
3137         ci.ifa_valid = valid;
3138
3139         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3140 }
3141
3142 static inline int rt_scope(int ifa_scope)
3143 {
3144         if (ifa_scope & IFA_HOST)
3145                 return RT_SCOPE_HOST;
3146         else if (ifa_scope & IFA_LINK)
3147                 return RT_SCOPE_LINK;
3148         else if (ifa_scope & IFA_SITE)
3149                 return RT_SCOPE_SITE;
3150         else
3151                 return RT_SCOPE_UNIVERSE;
3152 }
3153
3154 static inline int inet6_ifaddr_msgsize(void)
3155 {
3156         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3157                + nla_total_size(16) /* IFA_ADDRESS */
3158                + nla_total_size(sizeof(struct ifa_cacheinfo));
3159 }
3160
3161 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3162                              u32 pid, u32 seq, int event, unsigned int flags)
3163 {
3164         struct nlmsghdr  *nlh;
3165         u32 preferred, valid;
3166
3167         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3168         if (nlh == NULL)
3169                 return -EMSGSIZE;
3170
3171         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3172                       ifa->idev->dev->ifindex);
3173
3174         if (!(ifa->flags&IFA_F_PERMANENT)) {
3175                 preferred = ifa->prefered_lft;
3176                 valid = ifa->valid_lft;
3177                 if (preferred != INFINITY_LIFE_TIME) {
3178                         long tval = (jiffies - ifa->tstamp)/HZ;
3179                         preferred -= tval;
3180                         if (valid != INFINITY_LIFE_TIME)
3181                                 valid -= tval;
3182                 }
3183         } else {
3184                 preferred = INFINITY_LIFE_TIME;
3185                 valid = INFINITY_LIFE_TIME;
3186         }
3187
3188         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3189             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3190                 nlmsg_cancel(skb, nlh);
3191                 return -EMSGSIZE;
3192         }
3193
3194         return nlmsg_end(skb, nlh);
3195 }
3196
3197 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3198                                 u32 pid, u32 seq, int event, u16 flags)
3199 {
3200         struct nlmsghdr  *nlh;
3201         u8 scope = RT_SCOPE_UNIVERSE;
3202         int ifindex = ifmca->idev->dev->ifindex;
3203
3204         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3205                 scope = RT_SCOPE_SITE;
3206
3207         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3208         if (nlh == NULL)
3209                 return -EMSGSIZE;
3210
3211         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3212         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3213             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3214                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3215                 nlmsg_cancel(skb, nlh);
3216                 return -EMSGSIZE;
3217         }
3218
3219         return nlmsg_end(skb, nlh);
3220 }
3221
3222 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3223                                 u32 pid, u32 seq, int event, unsigned int flags)
3224 {
3225         struct nlmsghdr  *nlh;
3226         u8 scope = RT_SCOPE_UNIVERSE;
3227         int ifindex = ifaca->aca_idev->dev->ifindex;
3228
3229         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3230                 scope = RT_SCOPE_SITE;
3231
3232         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3233         if (nlh == NULL)
3234                 return -EMSGSIZE;
3235
3236         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3237         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3238             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3239                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3240                 nlmsg_cancel(skb, nlh);
3241                 return -EMSGSIZE;
3242         }
3243
3244         return nlmsg_end(skb, nlh);
3245 }
3246
3247 enum addr_type_t
3248 {
3249         UNICAST_ADDR,
3250         MULTICAST_ADDR,
3251         ANYCAST_ADDR,
3252 };
3253
3254 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3255                            enum addr_type_t type)
3256 {
3257         int idx, ip_idx;
3258         int s_idx, s_ip_idx;
3259         int err = 1;
3260         struct net_device *dev;
3261         struct inet6_dev *idev = NULL;
3262         struct inet6_ifaddr *ifa;
3263         struct ifmcaddr6 *ifmca;
3264         struct ifacaddr6 *ifaca;
3265
3266         s_idx = cb->args[0];
3267         s_ip_idx = ip_idx = cb->args[1];
3268
3269         idx = 0;
3270         for_each_netdev(&init_net, dev) {
3271                 if (idx < s_idx)
3272                         goto cont;
3273                 if (idx > s_idx)
3274                         s_ip_idx = 0;
3275                 ip_idx = 0;
3276                 if ((idev = in6_dev_get(dev)) == NULL)
3277                         goto cont;
3278                 read_lock_bh(&idev->lock);
3279                 switch (type) {
3280                 case UNICAST_ADDR:
3281                         /* unicast address incl. temp addr */
3282                         for (ifa = idev->addr_list; ifa;
3283                              ifa = ifa->if_next, ip_idx++) {
3284                                 if (ip_idx < s_ip_idx)
3285                                         continue;
3286                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3287                                     NETLINK_CB(cb->skb).pid,
3288                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3289                                     NLM_F_MULTI)) <= 0)
3290                                         goto done;
3291                         }
3292                         break;
3293                 case MULTICAST_ADDR:
3294                         /* multicast address */
3295                         for (ifmca = idev->mc_list; ifmca;
3296                              ifmca = ifmca->next, ip_idx++) {
3297                                 if (ip_idx < s_ip_idx)
3298                                         continue;
3299                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3300                                     NETLINK_CB(cb->skb).pid,
3301                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3302                                     NLM_F_MULTI)) <= 0)
3303                                         goto done;
3304                         }
3305                         break;
3306                 case ANYCAST_ADDR:
3307                         /* anycast address */
3308                         for (ifaca = idev->ac_list; ifaca;
3309                              ifaca = ifaca->aca_next, ip_idx++) {
3310                                 if (ip_idx < s_ip_idx)
3311                                         continue;
3312                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3313                                     NETLINK_CB(cb->skb).pid,
3314                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3315                                     NLM_F_MULTI)) <= 0)
3316                                         goto done;
3317                         }
3318                         break;
3319                 default:
3320                         break;
3321                 }
3322                 read_unlock_bh(&idev->lock);
3323                 in6_dev_put(idev);
3324 cont:
3325                 idx++;
3326         }
3327 done:
3328         if (err <= 0) {
3329                 read_unlock_bh(&idev->lock);
3330                 in6_dev_put(idev);
3331         }
3332         cb->args[0] = idx;
3333         cb->args[1] = ip_idx;
3334         return skb->len;
3335 }
3336
3337 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3338 {
3339         enum addr_type_t type = UNICAST_ADDR;
3340         return inet6_dump_addr(skb, cb, type);
3341 }
3342
3343 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3344 {
3345         enum addr_type_t type = MULTICAST_ADDR;
3346         return inet6_dump_addr(skb, cb, type);
3347 }
3348
3349
3350 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3351 {
3352         enum addr_type_t type = ANYCAST_ADDR;
3353         return inet6_dump_addr(skb, cb, type);
3354 }
3355
3356 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3357                              void *arg)
3358 {
3359         struct ifaddrmsg *ifm;
3360         struct nlattr *tb[IFA_MAX+1];
3361         struct in6_addr *addr = NULL;
3362         struct net_device *dev = NULL;
3363         struct inet6_ifaddr *ifa;
3364         struct sk_buff *skb;
3365         int err;
3366
3367         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3368         if (err < 0)
3369                 goto errout;
3370
3371         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3372         if (addr == NULL) {
3373                 err = -EINVAL;
3374                 goto errout;
3375         }
3376
3377         ifm = nlmsg_data(nlh);
3378         if (ifm->ifa_index)
3379                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3380
3381         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3382                 err = -EADDRNOTAVAIL;
3383                 goto errout;
3384         }
3385
3386         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3387                 err = -ENOBUFS;
3388                 goto errout_ifa;
3389         }
3390
3391         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3392                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3393         if (err < 0) {
3394                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3395                 WARN_ON(err == -EMSGSIZE);
3396                 kfree_skb(skb);
3397                 goto errout_ifa;
3398         }
3399         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3400 errout_ifa:
3401         in6_ifa_put(ifa);
3402 errout:
3403         return err;
3404 }
3405
3406 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3407 {
3408         struct sk_buff *skb;
3409         int err = -ENOBUFS;
3410
3411         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3412         if (skb == NULL)
3413                 goto errout;
3414
3415         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3416         if (err < 0) {
3417                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3418                 WARN_ON(err == -EMSGSIZE);
3419                 kfree_skb(skb);
3420                 goto errout;
3421         }
3422         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3423 errout:
3424         if (err < 0)
3425                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3426 }
3427
3428 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3429                                 __s32 *array, int bytes)
3430 {
3431         BUG_ON(bytes < (DEVCONF_MAX * 4));
3432
3433         memset(array, 0, bytes);
3434         array[DEVCONF_FORWARDING] = cnf->forwarding;
3435         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3436         array[DEVCONF_MTU6] = cnf->mtu6;
3437         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3438         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3439         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3440         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3441         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3442         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3443         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3444         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3445 #ifdef CONFIG_IPV6_PRIVACY
3446         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3447         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3448         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3449         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3450         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3451 #endif
3452         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3453         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3454         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3455 #ifdef CONFIG_IPV6_ROUTER_PREF
3456         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3457         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3458 #ifdef CONFIG_IPV6_ROUTE_INFO
3459         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3460 #endif
3461 #endif
3462         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3463         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3464 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3465         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3466 #endif
3467 }
3468
3469 static inline size_t inet6_if_nlmsg_size(void)
3470 {
3471         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3472                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3473                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3474                + nla_total_size(4) /* IFLA_MTU */
3475                + nla_total_size(4) /* IFLA_LINK */
3476                + nla_total_size( /* IFLA_PROTINFO */
3477                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3478                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3479                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3480                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3481                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3482                  );
3483 }
3484
3485 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3486                                       int bytes)
3487 {
3488         int i;
3489         int pad = bytes - sizeof(u64) * items;
3490         BUG_ON(pad < 0);
3491
3492         /* Use put_unaligned() because stats may not be aligned for u64. */
3493         put_unaligned(items, &stats[0]);
3494         for (i = 1; i < items; i++)
3495                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3496
3497         memset(&stats[items], 0, pad);
3498 }
3499
3500 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3501                              int bytes)
3502 {
3503         switch(attrtype) {
3504         case IFLA_INET6_STATS:
3505                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3506                 break;
3507         case IFLA_INET6_ICMP6STATS:
3508                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3509                 break;
3510         }
3511 }
3512
3513 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3514                              u32 pid, u32 seq, int event, unsigned int flags)
3515 {
3516         struct net_device *dev = idev->dev;
3517         struct nlattr *nla;
3518         struct ifinfomsg *hdr;
3519         struct nlmsghdr *nlh;
3520         void *protoinfo;
3521         struct ifla_cacheinfo ci;
3522
3523         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3524         if (nlh == NULL)
3525                 return -EMSGSIZE;
3526
3527         hdr = nlmsg_data(nlh);
3528         hdr->ifi_family = AF_INET6;
3529         hdr->__ifi_pad = 0;
3530         hdr->ifi_type = dev->type;
3531         hdr->ifi_index = dev->ifindex;
3532         hdr->ifi_flags = dev_get_flags(dev);
3533         hdr->ifi_change = 0;
3534
3535         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3536
3537         if (dev->addr_len)
3538                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3539
3540         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3541         if (dev->ifindex != dev->iflink)
3542                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3543
3544         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3545         if (protoinfo == NULL)
3546                 goto nla_put_failure;
3547
3548         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3549
3550         ci.max_reasm_len = IPV6_MAXPLEN;
3551         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3552                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3553         ci.reachable_time = idev->nd_parms->reachable_time;
3554         ci.retrans_time = idev->nd_parms->retrans_time;
3555         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3556
3557         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3558         if (nla == NULL)
3559                 goto nla_put_failure;
3560         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3561
3562         /* XXX - MC not implemented */
3563
3564         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3565         if (nla == NULL)
3566                 goto nla_put_failure;
3567         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3568
3569         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3570         if (nla == NULL)
3571                 goto nla_put_failure;
3572         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3573
3574         nla_nest_end(skb, protoinfo);
3575         return nlmsg_end(skb, nlh);
3576
3577 nla_put_failure:
3578         nlmsg_cancel(skb, nlh);
3579         return -EMSGSIZE;
3580 }
3581
3582 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3583 {
3584         int idx, err;
3585         int s_idx = cb->args[0];
3586         struct net_device *dev;
3587         struct inet6_dev *idev;
3588
3589         read_lock(&dev_base_lock);
3590         idx = 0;
3591         for_each_netdev(&init_net, dev) {
3592                 if (idx < s_idx)
3593                         goto cont;
3594                 if ((idev = in6_dev_get(dev)) == NULL)
3595                         goto cont;
3596                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3597                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3598                 in6_dev_put(idev);
3599                 if (err <= 0)
3600                         break;
3601 cont:
3602                 idx++;
3603         }
3604         read_unlock(&dev_base_lock);
3605         cb->args[0] = idx;
3606
3607         return skb->len;
3608 }
3609
3610 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3611 {
3612         struct sk_buff *skb;
3613         int err = -ENOBUFS;
3614
3615         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3616         if (skb == NULL)
3617                 goto errout;
3618
3619         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3620         if (err < 0) {
3621                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3622                 WARN_ON(err == -EMSGSIZE);
3623                 kfree_skb(skb);
3624                 goto errout;
3625         }
3626         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3627 errout:
3628         if (err < 0)
3629                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3630 }
3631
3632 static inline size_t inet6_prefix_nlmsg_size(void)
3633 {
3634         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3635                + nla_total_size(sizeof(struct in6_addr))
3636                + nla_total_size(sizeof(struct prefix_cacheinfo));
3637 }
3638
3639 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3640                              struct prefix_info *pinfo, u32 pid, u32 seq,
3641                              int event, unsigned int flags)
3642 {
3643         struct prefixmsg *pmsg;
3644         struct nlmsghdr *nlh;
3645         struct prefix_cacheinfo ci;
3646
3647         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3648         if (nlh == NULL)
3649                 return -EMSGSIZE;
3650
3651         pmsg = nlmsg_data(nlh);
3652         pmsg->prefix_family = AF_INET6;
3653         pmsg->prefix_pad1 = 0;
3654         pmsg->prefix_pad2 = 0;
3655         pmsg->prefix_ifindex = idev->dev->ifindex;
3656         pmsg->prefix_len = pinfo->prefix_len;
3657         pmsg->prefix_type = pinfo->type;
3658         pmsg->prefix_pad3 = 0;
3659         pmsg->prefix_flags = 0;
3660         if (pinfo->onlink)
3661                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3662         if (pinfo->autoconf)
3663                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3664
3665         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3666
3667         ci.preferred_time = ntohl(pinfo->prefered);
3668         ci.valid_time = ntohl(pinfo->valid);
3669         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3670
3671         return nlmsg_end(skb, nlh);
3672
3673 nla_put_failure:
3674         nlmsg_cancel(skb, nlh);
3675         return -EMSGSIZE;
3676 }
3677
3678 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3679                          struct prefix_info *pinfo)
3680 {
3681         struct sk_buff *skb;
3682         int err = -ENOBUFS;
3683
3684         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3685         if (skb == NULL)
3686                 goto errout;
3687
3688         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3689         if (err < 0) {
3690                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3691                 WARN_ON(err == -EMSGSIZE);
3692                 kfree_skb(skb);
3693                 goto errout;
3694         }
3695         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3696 errout:
3697         if (err < 0)
3698                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3699 }
3700
3701 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3702 {
3703         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3704
3705         switch (event) {
3706         case RTM_NEWADDR:
3707                 /*
3708                  * If the address was optimistic
3709                  * we inserted the route at the start of
3710                  * our DAD process, so we don't need
3711                  * to do it again
3712                  */
3713                 if (!(ifp->rt->rt6i_node))
3714                         ip6_ins_rt(ifp->rt);
3715                 if (ifp->idev->cnf.forwarding)
3716                         addrconf_join_anycast(ifp);
3717                 break;
3718         case RTM_DELADDR:
3719                 if (ifp->idev->cnf.forwarding)
3720                         addrconf_leave_anycast(ifp);
3721                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3722                 dst_hold(&ifp->rt->u.dst);
3723                 if (ip6_del_rt(ifp->rt))
3724                         dst_free(&ifp->rt->u.dst);
3725                 break;
3726         }
3727 }
3728
3729 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3730 {
3731         rcu_read_lock_bh();
3732         if (likely(ifp->idev->dead == 0))
3733                 __ipv6_ifa_notify(event, ifp);
3734         rcu_read_unlock_bh();
3735 }
3736
3737 #ifdef CONFIG_SYSCTL
3738
3739 static
3740 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3741                            void __user *buffer, size_t *lenp, loff_t *ppos)
3742 {
3743         int *valp = ctl->data;
3744         int val = *valp;
3745         int ret;
3746
3747         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3748
3749         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3750                 if (valp != &ipv6_devconf.forwarding) {
3751                         if ((!*valp) ^ (!val)) {
3752                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3753                                 if (idev == NULL)
3754                                         return ret;
3755                                 dev_forward_change(idev);
3756                         }
3757                 } else {
3758                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3759                         addrconf_forward_change();
3760                 }
3761                 if (*valp)
3762                         rt6_purge_dflt_routers();
3763         }
3764
3765         return ret;
3766 }
3767
3768 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3769                                             int __user *name, int nlen,
3770                                             void __user *oldval,
3771                                             size_t __user *oldlenp,
3772                                             void __user *newval, size_t newlen)
3773 {
3774         int *valp = table->data;
3775         int new;
3776
3777         if (!newval || !newlen)
3778                 return 0;
3779         if (newlen != sizeof(int))
3780                 return -EINVAL;
3781         if (get_user(new, (int __user *)newval))
3782                 return -EFAULT;
3783         if (new == *valp)
3784                 return 0;
3785         if (oldval && oldlenp) {
3786                 size_t len;
3787                 if (get_user(len, oldlenp))
3788                         return -EFAULT;
3789                 if (len) {
3790                         if (len > table->maxlen)
3791                                 len = table->maxlen;
3792                         if (copy_to_user(oldval, valp, len))
3793                                 return -EFAULT;
3794                         if (put_user(len, oldlenp))
3795                                 return -EFAULT;
3796                 }
3797         }
3798
3799         if (valp != &ipv6_devconf_dflt.forwarding) {
3800                 if (valp != &ipv6_devconf.forwarding) {
3801                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3802                         int changed;
3803                         if (unlikely(idev == NULL))
3804                                 return -ENODEV;
3805                         changed = (!*valp) ^ (!new);
3806                         *valp = new;
3807                         if (changed)
3808                                 dev_forward_change(idev);
3809                 } else {
3810                         *valp = new;
3811                         addrconf_forward_change();
3812                 }
3813
3814                 if (*valp)
3815                         rt6_purge_dflt_routers();
3816         } else
3817                 *valp = new;
3818
3819         return 1;
3820 }
3821
3822 static struct addrconf_sysctl_table
3823 {
3824         struct ctl_table_header *sysctl_header;
3825         ctl_table addrconf_vars[__NET_IPV6_MAX];
3826         ctl_table addrconf_dev[2];
3827         ctl_table addrconf_conf_dir[2];
3828         ctl_table addrconf_proto_dir[2];
3829         ctl_table addrconf_root_dir[2];
3830 } addrconf_sysctl __read_mostly = {
3831         .sysctl_header = NULL,
3832         .addrconf_vars = {
3833                 {
3834                         .ctl_name       =       NET_IPV6_FORWARDING,
3835                         .procname       =       "forwarding",
3836                         .data           =       &ipv6_devconf.forwarding,
3837                         .maxlen         =       sizeof(int),
3838                         .mode           =       0644,
3839                         .proc_handler   =       &addrconf_sysctl_forward,
3840                         .strategy       =       &addrconf_sysctl_forward_strategy,
3841                 },
3842                 {
3843                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3844                         .procname       =       "hop_limit",
3845                         .data           =       &ipv6_devconf.hop_limit,
3846                         .maxlen         =       sizeof(int),
3847                         .mode           =       0644,
3848                         .proc_handler   =       proc_dointvec,
3849                 },
3850                 {
3851                         .ctl_name       =       NET_IPV6_MTU,
3852                         .procname       =       "mtu",
3853                         .data           =       &ipv6_devconf.mtu6,
3854                         .maxlen         =       sizeof(int),
3855                         .mode           =       0644,
3856                         .proc_handler   =       &proc_dointvec,
3857                 },
3858                 {
3859                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3860                         .procname       =       "accept_ra",
3861                         .data           =       &ipv6_devconf.accept_ra,
3862                         .maxlen         =       sizeof(int),
3863                         .mode           =       0644,
3864                         .proc_handler   =       &proc_dointvec,
3865                 },
3866                 {
3867                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3868                         .procname       =       "accept_redirects",
3869                         .data           =       &ipv6_devconf.accept_redirects,
3870                         .maxlen         =       sizeof(int),
3871                         .mode           =       0644,
3872                         .proc_handler   =       &proc_dointvec,
3873                 },
3874                 {
3875                         .ctl_name       =       NET_IPV6_AUTOCONF,
3876                         .procname       =       "autoconf",
3877                         .data           =       &ipv6_devconf.autoconf,
3878                         .maxlen         =       sizeof(int),
3879                         .mode           =       0644,
3880                         .proc_handler   =       &proc_dointvec,
3881                 },
3882                 {
3883                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3884                         .procname       =       "dad_transmits",
3885                         .data           =       &ipv6_devconf.dad_transmits,
3886                         .maxlen         =       sizeof(int),
3887                         .mode           =       0644,
3888                         .proc_handler   =       &proc_dointvec,
3889                 },
3890                 {
3891                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3892                         .procname       =       "router_solicitations",
3893                         .data           =       &ipv6_devconf.rtr_solicits,
3894                         .maxlen         =       sizeof(int),
3895                         .mode           =       0644,
3896                         .proc_handler   =       &proc_dointvec,
3897                 },
3898                 {
3899                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3900                         .procname       =       "router_solicitation_interval",
3901                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3902                         .maxlen         =       sizeof(int),
3903                         .mode           =       0644,
3904                         .proc_handler   =       &proc_dointvec_jiffies,
3905                         .strategy       =       &sysctl_jiffies,
3906                 },
3907                 {
3908                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3909                         .procname       =       "router_solicitation_delay",
3910                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3911                         .maxlen         =       sizeof(int),
3912                         .mode           =       0644,
3913                         .proc_handler   =       &proc_dointvec_jiffies,
3914                         .strategy       =       &sysctl_jiffies,
3915                 },
3916                 {
3917                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3918                         .procname       =       "force_mld_version",
3919                         .data           =       &ipv6_devconf.force_mld_version,
3920                         .maxlen         =       sizeof(int),
3921                         .mode           =       0644,
3922                         .proc_handler   =       &proc_dointvec,
3923                 },
3924 #ifdef CONFIG_IPV6_PRIVACY
3925                 {
3926                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3927                         .procname       =       "use_tempaddr",
3928                         .data           =       &ipv6_devconf.use_tempaddr,
3929                         .maxlen         =       sizeof(int),
3930                         .mode           =       0644,
3931                         .proc_handler   =       &proc_dointvec,
3932                 },
3933                 {
3934                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3935                         .procname       =       "temp_valid_lft",
3936                         .data           =       &ipv6_devconf.temp_valid_lft,
3937                         .maxlen         =       sizeof(int),
3938                         .mode           =       0644,
3939                         .proc_handler   =       &proc_dointvec,
3940                 },
3941                 {
3942                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3943                         .procname       =       "temp_prefered_lft",
3944                         .data           =       &ipv6_devconf.temp_prefered_lft,
3945                         .maxlen         =       sizeof(int),
3946                         .mode           =       0644,
3947                         .proc_handler   =       &proc_dointvec,
3948                 },
3949                 {
3950                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3951                         .procname       =       "regen_max_retry",
3952                         .data           =       &ipv6_devconf.regen_max_retry,
3953                         .maxlen         =       sizeof(int),
3954                         .mode           =       0644,
3955                         .proc_handler   =       &proc_dointvec,
3956                 },
3957                 {
3958                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3959                         .procname       =       "max_desync_factor",
3960                         .data           =       &ipv6_devconf.max_desync_factor,
3961                         .maxlen         =       sizeof(int),
3962                         .mode           =       0644,
3963                         .proc_handler   =       &proc_dointvec,
3964                 },
3965 #endif
3966                 {
3967                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3968                         .procname       =       "max_addresses",
3969                         .data           =       &ipv6_devconf.max_addresses,
3970                         .maxlen         =       sizeof(int),
3971                         .mode           =       0644,
3972                         .proc_handler   =       &proc_dointvec,
3973                 },
3974                 {
3975                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3976                         .procname       =       "accept_ra_defrtr",
3977                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3978                         .maxlen         =       sizeof(int),
3979                         .mode           =       0644,
3980                         .proc_handler   =       &proc_dointvec,
3981                 },
3982                 {
3983                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3984                         .procname       =       "accept_ra_pinfo",
3985                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3986                         .maxlen         =       sizeof(int),
3987                         .mode           =       0644,
3988                         .proc_handler   =       &proc_dointvec,
3989                 },
3990 #ifdef CONFIG_IPV6_ROUTER_PREF
3991                 {
3992                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3993                         .procname       =       "accept_ra_rtr_pref",
3994                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3995                         .maxlen         =       sizeof(int),
3996                         .mode           =       0644,
3997                         .proc_handler   =       &proc_dointvec,
3998                 },
3999                 {
4000                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4001                         .procname       =       "router_probe_interval",
4002                         .data           =       &ipv6_devconf.rtr_probe_interval,
4003                         .maxlen         =       sizeof(int),
4004                         .mode           =       0644,
4005                         .proc_handler   =       &proc_dointvec_jiffies,
4006                         .strategy       =       &sysctl_jiffies,
4007                 },
4008 #ifdef CONFIG_IPV6_ROUTE_INFO
4009                 {
4010                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4011                         .procname       =       "accept_ra_rt_info_max_plen",
4012                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4013                         .maxlen         =       sizeof(int),
4014                         .mode           =       0644,
4015                         .proc_handler   =       &proc_dointvec,
4016                 },
4017 #endif
4018 #endif
4019                 {
4020                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4021                         .procname       =       "proxy_ndp",
4022                         .data           =       &ipv6_devconf.proxy_ndp,
4023                         .maxlen         =       sizeof(int),
4024                         .mode           =       0644,
4025                         .proc_handler   =       &proc_dointvec,
4026                 },
4027                 {
4028                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4029                         .procname       =       "accept_source_route",
4030                         .data           =       &ipv6_devconf.accept_source_route,
4031                         .maxlen         =       sizeof(int),
4032                         .mode           =       0644,
4033                         .proc_handler   =       &proc_dointvec,
4034                 },
4035 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4036                 {
4037                         .ctl_name       =       CTL_UNNUMBERED,
4038                         .procname       =       "optimistic_dad",
4039                         .data           =       &ipv6_devconf.optimistic_dad,
4040                         .maxlen         =       sizeof(int),
4041                         .mode           =       0644,
4042                         .proc_handler   =       &proc_dointvec,
4043
4044                 },
4045 #endif
4046                 {
4047                         .ctl_name       =       0,      /* sentinel */
4048                 }
4049         },
4050         .addrconf_dev = {
4051                 {
4052                         .ctl_name       =       NET_PROTO_CONF_ALL,
4053                         .procname       =       "all",
4054                         .mode           =       0555,
4055                         .child          =       addrconf_sysctl.addrconf_vars,
4056                 },
4057                 {
4058                         .ctl_name       =       0,      /* sentinel */
4059                 }
4060         },
4061         .addrconf_conf_dir = {
4062                 {
4063                         .ctl_name       =       NET_IPV6_CONF,
4064                         .procname       =       "conf",
4065                         .mode           =       0555,
4066                         .child          =       addrconf_sysctl.addrconf_dev,
4067                 },
4068                 {
4069                         .ctl_name       =       0,      /* sentinel */
4070                 }
4071         },
4072         .addrconf_proto_dir = {
4073                 {
4074                         .ctl_name       =       NET_IPV6,
4075                         .procname       =       "ipv6",
4076                         .mode           =       0555,
4077                         .child          =       addrconf_sysctl.addrconf_conf_dir,
4078                 },
4079                 {
4080                         .ctl_name       =       0,      /* sentinel */
4081                 }
4082         },
4083         .addrconf_root_dir = {
4084                 {
4085                         .ctl_name       =       CTL_NET,
4086                         .procname       =       "net",
4087                         .mode           =       0555,
4088                         .child          =       addrconf_sysctl.addrconf_proto_dir,
4089                 },
4090                 {
4091                         .ctl_name       =       0,      /* sentinel */
4092                 }
4093         },
4094 };
4095
4096 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4097 {
4098         int i;
4099         struct net_device *dev = idev ? idev->dev : NULL;
4100         struct addrconf_sysctl_table *t;
4101         char *dev_name = NULL;
4102
4103         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4104         if (t == NULL)
4105                 return;
4106         for (i=0; t->addrconf_vars[i].data; i++) {
4107                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4108                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4109         }
4110         if (dev) {
4111                 dev_name = dev->name;
4112                 t->addrconf_dev[0].ctl_name = dev->ifindex;
4113         } else {
4114                 dev_name = "default";
4115                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4116         }
4117
4118         /*
4119          * Make a copy of dev_name, because '.procname' is regarded as const
4120          * by sysctl and we wouldn't want anyone to change it under our feet
4121          * (see SIOCSIFNAME).
4122          */
4123         dev_name = kstrdup(dev_name, GFP_KERNEL);
4124         if (!dev_name)
4125             goto free;
4126
4127         t->addrconf_dev[0].procname = dev_name;
4128
4129         t->addrconf_dev[0].child = t->addrconf_vars;
4130         t->addrconf_conf_dir[0].child = t->addrconf_dev;
4131         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4132         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4133
4134         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4135         if (t->sysctl_header == NULL)
4136                 goto free_procname;
4137         else
4138                 p->sysctl = t;
4139         return;
4140
4141         /* error path */
4142  free_procname:
4143         kfree(dev_name);
4144  free:
4145         kfree(t);
4146
4147         return;
4148 }
4149
4150 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4151 {
4152         if (p->sysctl) {
4153                 struct addrconf_sysctl_table *t = p->sysctl;
4154                 p->sysctl = NULL;
4155                 unregister_sysctl_table(t->sysctl_header);
4156                 kfree(t->addrconf_dev[0].procname);
4157                 kfree(t);
4158         }
4159 }
4160
4161
4162 #endif
4163
4164 /*
4165  *      Device notifier
4166  */
4167
4168 int register_inet6addr_notifier(struct notifier_block *nb)
4169 {
4170         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4171 }
4172
4173 EXPORT_SYMBOL(register_inet6addr_notifier);
4174
4175 int unregister_inet6addr_notifier(struct notifier_block *nb)
4176 {
4177         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4178 }
4179
4180 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4181
4182 /*
4183  *      Init / cleanup code
4184  */
4185
4186 int __init addrconf_init(void)
4187 {
4188         int err = 0;
4189
4190         /* The addrconf netdev notifier requires that loopback_dev
4191          * has it's ipv6 private information allocated and setup
4192          * before it can bring up and give link-local addresses
4193          * to other devices which are up.
4194          *
4195          * Unfortunately, loopback_dev is not necessarily the first
4196          * entry in the global dev_base list of net devices.  In fact,
4197          * it is likely to be the very last entry on that list.
4198          * So this causes the notifier registry below to try and
4199          * give link-local addresses to all devices besides loopback_dev
4200          * first, then loopback_dev, which cases all the non-loopback_dev
4201          * devices to fail to get a link-local address.
4202          *
4203          * So, as a temporary fix, allocate the ipv6 structure for
4204          * loopback_dev first by hand.
4205          * Longer term, all of the dependencies ipv6 has upon the loopback
4206          * device and it being up should be removed.
4207          */
4208         rtnl_lock();
4209         if (!ipv6_add_dev(init_net.loopback_dev))
4210                 err = -ENOMEM;
4211         rtnl_unlock();
4212         if (err)
4213                 return err;
4214
4215         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4216         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4217 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4218         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4219         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4220         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4221         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4222 #endif
4223
4224         register_netdevice_notifier(&ipv6_dev_notf);
4225
4226         addrconf_verify(0);
4227
4228         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4229         if (err < 0)
4230                 goto errout;
4231
4232         /* Only the first call to __rtnl_register can fail */
4233         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4234         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4235         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4236         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4237         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4238
4239 #ifdef CONFIG_SYSCTL
4240         addrconf_sysctl.sysctl_header =
4241                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4242         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4243 #endif
4244
4245         return 0;
4246 errout:
4247         unregister_netdevice_notifier(&ipv6_dev_notf);
4248
4249         return err;
4250 }
4251
4252 void __exit addrconf_cleanup(void)
4253 {
4254         struct net_device *dev;
4255         struct inet6_ifaddr *ifa;
4256         int i;
4257
4258         unregister_netdevice_notifier(&ipv6_dev_notf);
4259
4260 #ifdef CONFIG_SYSCTL
4261         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4262         addrconf_sysctl_unregister(&ipv6_devconf);
4263 #endif
4264
4265         rtnl_lock();
4266
4267         /*
4268          *      clean dev list.
4269          */
4270
4271         for_each_netdev(&init_net, dev) {
4272                 if (__in6_dev_get(dev) == NULL)
4273                         continue;
4274                 addrconf_ifdown(dev, 1);
4275         }
4276         addrconf_ifdown(init_net.loopback_dev, 2);
4277
4278         /*
4279          *      Check hash table.
4280          */
4281
4282         write_lock_bh(&addrconf_hash_lock);
4283         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4284                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4285                         struct inet6_ifaddr *bifa;
4286
4287                         bifa = ifa;
4288                         ifa = ifa->lst_next;
4289                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4290                         /* Do not free it; something is wrong.
4291                            Now we can investigate it with debugger.
4292                          */
4293                 }
4294         }
4295         write_unlock_bh(&addrconf_hash_lock);
4296
4297         del_timer(&addr_chk_timer);
4298
4299         rtnl_unlock();
4300 }