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);
 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 106 #else
 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 108 {
 109 }
 110
 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 112 {
 113 }
 114 #endif
 115
 116 #ifdef CONFIG_IPV6_PRIVACY
 117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 119 static void ipv6_regen_rndid(unsigned long data);
 120
 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 122 #endif
 123
 124 static int ipv6_count_addresses(struct inet6_dev *idev);
 125
 126 /*
 127  *      Configured unicast address hash table
 128  */
 129 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 130 static DEFINE_RWLOCK(addrconf_hash_lock);
 131
 132 static void addrconf_verify(unsigned long);
 133
 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 135 static DEFINE_SPINLOCK(addrconf_verify_lock);
 136
 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 139
 140 static int addrconf_ifdown(struct net_device *dev, int how);
 141
 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 143 static void addrconf_dad_timer(unsigned long data);
 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 145 static void addrconf_dad_run(struct inet6_dev *idev);
 146 static void addrconf_rs_timer(unsigned long data);
 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 149
 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 151                                 struct prefix_info *pinfo);
 152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 153                               struct net_device *dev);
 154
 155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 156
 157 struct ipv6_devconf ipv6_devconf __read_mostly = {
 158         .forwarding             = 0,
 159         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 160         .mtu6                   = IPV6_MIN_MTU,
 161         .accept_ra              = 1,
 162         .accept_redirects       = 1,
 163         .autoconf               = 1,
 164         .force_mld_version      = 0,
 165         .dad_transmits          = 1,
 166         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 167         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 168         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 169 #ifdef CONFIG_IPV6_PRIVACY
 170         .use_tempaddr           = 0,
 171         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 172         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 173         .regen_max_retry        = REGEN_MAX_RETRY,
 174         .max_desync_factor      = MAX_DESYNC_FACTOR,
 175 #endif
 176         .max_addresses          = IPV6_MAX_ADDRESSES,
 177         .accept_ra_defrtr       = 1,
 178         .accept_ra_pinfo        = 1,
 179 #ifdef CONFIG_IPV6_ROUTER_PREF
 180         .accept_ra_rtr_pref     = 1,
 181         .rtr_probe_interval     = 60 * HZ,
 182 #ifdef CONFIG_IPV6_ROUTE_INFO
 183         .accept_ra_rt_info_max_plen = 0,
 184 #endif
 185 #endif
 186         .proxy_ndp              = 0,
 187         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 188 };
 189
 190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 191         .forwarding             = 0,
 192         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 193         .mtu6                   = IPV6_MIN_MTU,
 194         .accept_ra              = 1,
 195         .accept_redirects       = 1,
 196         .autoconf               = 1,
 197         .dad_transmits          = 1,
 198         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 199         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 200         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 201 #ifdef CONFIG_IPV6_PRIVACY
 202         .use_tempaddr           = 0,
 203         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 204         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 205         .regen_max_retry        = REGEN_MAX_RETRY,
 206         .max_desync_factor      = MAX_DESYNC_FACTOR,
 207 #endif
 208         .max_addresses          = IPV6_MAX_ADDRESSES,
 209         .accept_ra_defrtr       = 1,
 210         .accept_ra_pinfo        = 1,
 211 #ifdef CONFIG_IPV6_ROUTER_PREF
 212         .accept_ra_rtr_pref     = 1,
 213         .rtr_probe_interval     = 60 * HZ,
 214 #ifdef CONFIG_IPV6_ROUTE_INFO
 215         .accept_ra_rt_info_max_plen = 0,
 216 #endif
 217 #endif
 218         .proxy_ndp              = 0,
 219         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 220 };
 221
 222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 225
 226 /* Check if a valid qdisc is available */
 227 static inline int addrconf_qdisc_ok(struct net_device *dev)
 228 {
 229         return (dev->qdisc != &noop_qdisc);
 230 }
 231
 232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 233 {
 234         if (del_timer(&ifp->timer))
 235                 __in6_ifa_put(ifp);
 236 }
 237
 238 enum addrconf_timer_t
 239 {
 240         AC_NONE,
 241         AC_DAD,
 242         AC_RS,
 243 };
 244
 245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 246                                enum addrconf_timer_t what,
 247                                unsigned long when)
 248 {
 249         if (!del_timer(&ifp->timer))
 250                 in6_ifa_hold(ifp);
 251
 252         switch (what) {
 253         case AC_DAD:
 254                 ifp->timer.function = addrconf_dad_timer;
 255                 break;
 256         case AC_RS:
 257                 ifp->timer.function = addrconf_rs_timer;
 258                 break;
 259         default:;
 260         }
 261         ifp->timer.expires = jiffies + when;
 262         add_timer(&ifp->timer);
 263 }
 264
 265 static int snmp6_alloc_dev(struct inet6_dev *idev)
 266 {
 267         if (snmp_mib_init((void **)idev->stats.ipv6,
 268                           sizeof(struct ipstats_mib)) < 0)
 269                 goto err_ip;
 270         if (snmp_mib_init((void **)idev->stats.icmpv6,
 271                           sizeof(struct icmpv6_mib)) < 0)
 272                 goto err_icmp;
 273         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 274                           sizeof(struct icmpv6msg_mib)) < 0)
 275                 goto err_icmpmsg;
 276
 277         return 0;
 278
 279 err_icmpmsg:
 280         snmp_mib_free((void **)idev->stats.icmpv6);
 281 err_icmp:
 282         snmp_mib_free((void **)idev->stats.ipv6);
 283 err_ip:
 284         return -ENOMEM;
 285 }
 286
 287 static void snmp6_free_dev(struct inet6_dev *idev)
 288 {
 289         snmp_mib_free((void **)idev->stats.icmpv6msg);
 290         snmp_mib_free((void **)idev->stats.icmpv6);
 291         snmp_mib_free((void **)idev->stats.ipv6);
 292 }
 293
 294 /* Nobody refers to this device, we may destroy it. */
 295
 296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 297 {
 298         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 299         kfree(idev);
 300 }
 301
 302 void in6_dev_finish_destroy(struct inet6_dev *idev)
 303 {
 304         struct net_device *dev = idev->dev;
 305         BUG_TRAP(idev->addr_list==NULL);
 306         BUG_TRAP(idev->mc_list==NULL);
 307 #ifdef NET_REFCNT_DEBUG
 308         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 309 #endif
 310         dev_put(dev);
 311         if (!idev->dead) {
 312                 printk("Freeing alive inet6 device %p\n", idev);
 313                 return;
 314         }
 315         snmp6_free_dev(idev);
 316         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 317 }
 318
 319 EXPORT_SYMBOL(in6_dev_finish_destroy);
 320
 321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 322 {
 323         struct inet6_dev *ndev;
 324         struct in6_addr maddr;
 325
 326         ASSERT_RTNL();
 327
 328         if (dev->mtu < IPV6_MIN_MTU)
 329                 return NULL;
 330
 331         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 332
 333         if (ndev == NULL)
 334                 return NULL;
 335
 336         rwlock_init(&ndev->lock);
 337         ndev->dev = dev;
 338         memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
 339         ndev->cnf.mtu6 = dev->mtu;
 340         ndev->cnf.sysctl = NULL;
 341         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 342         if (ndev->nd_parms == NULL) {
 343                 kfree(ndev);
 344                 return NULL;
 345         }
 346         /* We refer to the device */
 347         dev_hold(dev);
 348
 349         if (snmp6_alloc_dev(ndev) < 0) {
 350                 ADBG((KERN_WARNING
 351                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 352                         __func__, dev->name));
 353                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 354                 ndev->dead = 1;
 355                 in6_dev_finish_destroy(ndev);
 356                 return NULL;
 357         }
 358
 359         if (snmp6_register_dev(ndev) < 0) {
 360                 ADBG((KERN_WARNING
 361                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 362                         __func__, dev->name));
 363                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 364                 ndev->dead = 1;
 365                 in6_dev_finish_destroy(ndev);
 366                 return NULL;
 367         }
 368
 369         /* One reference from device.  We must do this before
 370          * we invoke __ipv6_regen_rndid().
 371          */
 372         in6_dev_hold(ndev);
 373
 374 #ifdef CONFIG_IPV6_PRIVACY
 375         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 376         if ((dev->flags&IFF_LOOPBACK) ||
 377             dev->type == ARPHRD_TUNNEL ||
 378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 379             dev->type == ARPHRD_SIT ||
 380 #endif
 381             dev->type == ARPHRD_NONE) {
 382                 printk(KERN_INFO
 383                        "%s: Disabled Privacy Extensions\n",
 384                        dev->name);
 385                 ndev->cnf.use_tempaddr = -1;
 386
 387                 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 388                         printk(KERN_INFO
 389                                "%s: Disabled Multicast RS\n",
 390                                dev->name);
 391                         ndev->cnf.rtr_solicits = 0;
 392                 }
 393         } else {
 394                 in6_dev_hold(ndev);
 395                 ipv6_regen_rndid((unsigned long) ndev);
 396         }
 397 #endif
 398
 399         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 400                 ndev->if_flags |= IF_READY;
 401
 402         ipv6_mc_init_dev(ndev);
 403         ndev->tstamp = jiffies;
 404         addrconf_sysctl_register(ndev);
 405         /* protected by rtnl_lock */
 406         rcu_assign_pointer(dev->ip6_ptr, ndev);
 407
 408         /* Join all-node multicast group */
 409         ipv6_addr_all_nodes(&maddr);
 410         ipv6_dev_mc_inc(dev, &maddr);
 411
 412         return ndev;
 413 }
 414
 415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 416 {
 417         struct inet6_dev *idev;
 418
 419         ASSERT_RTNL();
 420
 421         if ((idev = __in6_dev_get(dev)) == NULL) {
 422                 if ((idev = ipv6_add_dev(dev)) == NULL)
 423                         return NULL;
 424         }
 425
 426         if (dev->flags&IFF_UP)
 427                 ipv6_mc_up(idev);
 428         return idev;
 429 }
 430
 431 #ifdef CONFIG_SYSCTL
 432 static void dev_forward_change(struct inet6_dev *idev)
 433 {
 434         struct net_device *dev;
 435         struct inet6_ifaddr *ifa;
 436         struct in6_addr addr;
 437
 438         if (!idev)
 439                 return;
 440         dev = idev->dev;
 441         if (dev && (dev->flags & IFF_MULTICAST)) {
 442                 ipv6_addr_all_routers(&addr);
 443
 444                 if (idev->cnf.forwarding)
 445                         ipv6_dev_mc_inc(dev, &addr);
 446                 else
 447                         ipv6_dev_mc_dec(dev, &addr);
 448         }
 449         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 450                 if (ifa->flags&IFA_F_TENTATIVE)
 451                         continue;
 452                 if (idev->cnf.forwarding)
 453                         addrconf_join_anycast(ifa);
 454                 else
 455                         addrconf_leave_anycast(ifa);
 456         }
 457 }
 458
 459
 460 static void addrconf_forward_change(struct net *net, __s32 newf)
 461 {
 462         struct net_device *dev;
 463         struct inet6_dev *idev;
 464
 465         read_lock(&dev_base_lock);
 466         for_each_netdev(net, dev) {
 467                 rcu_read_lock();
 468                 idev = __in6_dev_get(dev);
 469                 if (idev) {
 470                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 471                         idev->cnf.forwarding = newf;
 472                         if (changed)
 473                                 dev_forward_change(idev);
 474                 }
 475                 rcu_read_unlock();
 476         }
 477         read_unlock(&dev_base_lock);
 478 }
 479
 480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 481 {
 482         struct net *net;
 483
 484         net = (struct net *)table->extra2;
 485         if (p == &net->ipv6.devconf_dflt->forwarding)
 486                 return;
 487
 488         if (p == &net->ipv6.devconf_all->forwarding) {
 489                 __s32 newf = net->ipv6.devconf_all->forwarding;
 490                 net->ipv6.devconf_dflt->forwarding = newf;
 491                 addrconf_forward_change(net, newf);
 492         } else if ((!*p) ^ (!old))
 493                 dev_forward_change((struct inet6_dev *)table->extra1);
 494
 495         if (*p)
 496                 rt6_purge_dflt_routers(net);
 497 }
 498 #endif
 499
 500 /* Nobody refers to this ifaddr, destroy it */
 501
 502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 503 {
 504         BUG_TRAP(ifp->if_next==NULL);
 505         BUG_TRAP(ifp->lst_next==NULL);
 506 #ifdef NET_REFCNT_DEBUG
 507         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 508 #endif
 509
 510         in6_dev_put(ifp->idev);
 511
 512         if (del_timer(&ifp->timer))
 513                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 514
 515         if (!ifp->dead) {
 516                 printk("Freeing alive inet6 address %p\n", ifp);
 517                 return;
 518         }
 519         dst_release(&ifp->rt->u.dst);
 520
 521         kfree(ifp);
 522 }
 523
 524 static void
 525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 526 {
 527         struct inet6_ifaddr *ifa, **ifap;
 528         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 529
 530         /*
 531          * Each device address list is sorted in order of scope -
 532          * global before linklocal.
 533          */
 534         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 535              ifap = &ifa->if_next) {
 536                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 537                         break;
 538         }
 539
 540         ifp->if_next = *ifap;
 541         *ifap = ifp;
 542 }
 543
 544 /* On success it returns ifp with increased reference count */
 545
 546 static struct inet6_ifaddr *
 547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 548               int scope, u32 flags)
 549 {
 550         struct inet6_ifaddr *ifa = NULL;
 551         struct rt6_info *rt;
 552         int hash;
 553         int err = 0;
 554
 555         rcu_read_lock_bh();
 556         if (idev->dead) {
 557                 err = -ENODEV;                  /*XXX*/
 558                 goto out2;
 559         }
 560
 561         write_lock(&addrconf_hash_lock);
 562
 563         /* Ignore adding duplicate addresses on an interface */
 564         if (ipv6_chk_same_addr(idev->dev->nd_net, addr, idev->dev)) {
 565                 ADBG(("ipv6_add_addr: already assigned\n"));
 566                 err = -EEXIST;
 567                 goto out;
 568         }
 569
 570         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 571
 572         if (ifa == NULL) {
 573                 ADBG(("ipv6_add_addr: malloc failed\n"));
 574                 err = -ENOBUFS;
 575                 goto out;
 576         }
 577
 578         rt = addrconf_dst_alloc(idev, addr, 0);
 579         if (IS_ERR(rt)) {
 580                 err = PTR_ERR(rt);
 581                 goto out;
 582         }
 583
 584         ipv6_addr_copy(&ifa->addr, addr);
 585
 586         spin_lock_init(&ifa->lock);
 587         init_timer(&ifa->timer);
 588         ifa->timer.data = (unsigned long) ifa;
 589         ifa->scope = scope;
 590         ifa->prefix_len = pfxlen;
 591         ifa->flags = flags | IFA_F_TENTATIVE;
 592         ifa->cstamp = ifa->tstamp = jiffies;
 593
 594         ifa->rt = rt;
 595
 596         /*
 597          * part one of RFC 4429, section 3.3
 598          * We should not configure an address as
 599          * optimistic if we do not yet know the link
 600          * layer address of our nexhop router
 601          */
 602
 603         if (rt->rt6i_nexthop == NULL)
 604                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 605
 606         ifa->idev = idev;
 607         in6_dev_hold(idev);
 608         /* For caller */
 609         in6_ifa_hold(ifa);
 610
 611         /* Add to big hash table */
 612         hash = ipv6_addr_hash(addr);
 613
 614         ifa->lst_next = inet6_addr_lst[hash];
 615         inet6_addr_lst[hash] = ifa;
 616         in6_ifa_hold(ifa);
 617         write_unlock(&addrconf_hash_lock);
 618
 619         write_lock(&idev->lock);
 620         /* Add to inet6_dev unicast addr list. */
 621         ipv6_link_dev_addr(idev, ifa);
 622
 623 #ifdef CONFIG_IPV6_PRIVACY
 624         if (ifa->flags&IFA_F_TEMPORARY) {
 625                 ifa->tmp_next = idev->tempaddr_list;
 626                 idev->tempaddr_list = ifa;
 627                 in6_ifa_hold(ifa);
 628         }
 629 #endif
 630
 631         in6_ifa_hold(ifa);
 632         write_unlock(&idev->lock);
 633 out2:
 634         rcu_read_unlock_bh();
 635
 636         if (likely(err == 0))
 637                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 638         else {
 639                 kfree(ifa);
 640                 ifa = ERR_PTR(err);
 641         }
 642
 643         return ifa;
 644 out:
 645         write_unlock(&addrconf_hash_lock);
 646         goto out2;
 647 }
 648
 649 /* This function wants to get referenced ifp and releases it before return */
 650
 651 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 652 {
 653         struct inet6_ifaddr *ifa, **ifap;
 654         struct inet6_dev *idev = ifp->idev;
 655         int hash;
 656         int deleted = 0, onlink = 0;
 657         unsigned long expires = jiffies;
 658
 659         hash = ipv6_addr_hash(&ifp->addr);
 660
 661         ifp->dead = 1;
 662
 663         write_lock_bh(&addrconf_hash_lock);
 664         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 665              ifap = &ifa->lst_next) {
 666                 if (ifa == ifp) {
 667                         *ifap = ifa->lst_next;
 668                         __in6_ifa_put(ifp);
 669                         ifa->lst_next = NULL;
 670                         break;
 671                 }
 672         }
 673         write_unlock_bh(&addrconf_hash_lock);
 674
 675         write_lock_bh(&idev->lock);
 676 #ifdef CONFIG_IPV6_PRIVACY
 677         if (ifp->flags&IFA_F_TEMPORARY) {
 678                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 679                      ifap = &ifa->tmp_next) {
 680                         if (ifa == ifp) {
 681                                 *ifap = ifa->tmp_next;
 682                                 if (ifp->ifpub) {
 683                                         in6_ifa_put(ifp->ifpub);
 684                                         ifp->ifpub = NULL;
 685                                 }
 686                                 __in6_ifa_put(ifp);
 687                                 ifa->tmp_next = NULL;
 688                                 break;
 689                         }
 690                 }
 691         }
 692 #endif
 693
 694         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 695                 if (ifa == ifp) {
 696                         *ifap = ifa->if_next;
 697                         __in6_ifa_put(ifp);
 698                         ifa->if_next = NULL;
 699                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 700                                 break;
 701                         deleted = 1;
 702                         continue;
 703                 } else if (ifp->flags & IFA_F_PERMANENT) {
 704                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 705                                               ifp->prefix_len)) {
 706                                 if (ifa->flags & IFA_F_PERMANENT) {
 707                                         onlink = 1;
 708                                         if (deleted)
 709                                                 break;
 710                                 } else {
 711                                         unsigned long lifetime;
 712
 713                                         if (!onlink)
 714                                                 onlink = -1;
 715
 716                                         spin_lock(&ifa->lock);
 717                                         lifetime = min_t(unsigned long,
 718                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 719                                         if (time_before(expires,
 720                                                         ifa->tstamp + lifetime * HZ))
 721                                                 expires = ifa->tstamp + lifetime * HZ;
 722                                         spin_unlock(&ifa->lock);
 723                                 }
 724                         }
 725                 }
 726                 ifap = &ifa->if_next;
 727         }
 728         write_unlock_bh(&idev->lock);
 729
 730         ipv6_ifa_notify(RTM_DELADDR, ifp);
 731
 732         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 733
 734         addrconf_del_timer(ifp);
 735
 736         /*
 737          * Purge or update corresponding prefix
 738          *
 739          * 1) we don't purge prefix here if address was not permanent.
 740          *    prefix is managed by its own lifetime.
 741          * 2) if there're no addresses, delete prefix.
 742          * 3) if there're still other permanent address(es),
 743          *    corresponding prefix is still permanent.
 744          * 4) otherwise, update prefix lifetime to the
 745          *    longest valid lifetime among the corresponding
 746          *    addresses on the device.
 747          *    Note: subsequent RA will update lifetime.
 748          *
 749          * --yoshfuji
 750          */
 751         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 752                 struct in6_addr prefix;
 753                 struct rt6_info *rt;
 754                 struct net *net = ifp->idev->dev->nd_net;
 755                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 756                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 757
 758                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 759                         if (onlink == 0) {
 760                                 ip6_del_rt(rt);
 761                                 rt = NULL;
 762                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 763                                 rt->rt6i_expires = expires;
 764                                 rt->rt6i_flags |= RTF_EXPIRES;
 765                         }
 766                 }
 767                 dst_release(&rt->u.dst);
 768         }
 769
 770         in6_ifa_put(ifp);
 771 }
 772
 773 #ifdef CONFIG_IPV6_PRIVACY
 774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 775 {
 776         struct inet6_dev *idev = ifp->idev;
 777         struct in6_addr addr, *tmpaddr;
 778         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 779         int tmp_plen;
 780         int ret = 0;
 781         int max_addresses;
 782         u32 addr_flags;
 783
 784         write_lock(&idev->lock);
 785         if (ift) {
 786                 spin_lock_bh(&ift->lock);
 787                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 788                 spin_unlock_bh(&ift->lock);
 789                 tmpaddr = &addr;
 790         } else {
 791                 tmpaddr = NULL;
 792         }
 793 retry:
 794         in6_dev_hold(idev);
 795         if (idev->cnf.use_tempaddr <= 0) {
 796                 write_unlock(&idev->lock);
 797                 printk(KERN_INFO
 798                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 799                 in6_dev_put(idev);
 800                 ret = -1;
 801                 goto out;
 802         }
 803         spin_lock_bh(&ifp->lock);
 804         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 805                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 806                 spin_unlock_bh(&ifp->lock);
 807                 write_unlock(&idev->lock);
 808                 printk(KERN_WARNING
 809                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 810                 in6_dev_put(idev);
 811                 ret = -1;
 812                 goto out;
 813         }
 814         in6_ifa_hold(ifp);
 815         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 816         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 817                 spin_unlock_bh(&ifp->lock);
 818                 write_unlock(&idev->lock);
 819                 printk(KERN_WARNING
 820                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 821                 in6_ifa_put(ifp);
 822                 in6_dev_put(idev);
 823                 ret = -1;
 824                 goto out;
 825         }
 826         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 827         tmp_valid_lft = min_t(__u32,
 828                               ifp->valid_lft,
 829                               idev->cnf.temp_valid_lft);
 830         tmp_prefered_lft = min_t(__u32,
 831                                  ifp->prefered_lft,
 832                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 833         tmp_plen = ifp->prefix_len;
 834         max_addresses = idev->cnf.max_addresses;
 835         tmp_cstamp = ifp->cstamp;
 836         tmp_tstamp = ifp->tstamp;
 837         spin_unlock_bh(&ifp->lock);
 838
 839         write_unlock(&idev->lock);
 840
 841         addr_flags = IFA_F_TEMPORARY;
 842         /* set in addrconf_prefix_rcv() */
 843         if (ifp->flags & IFA_F_OPTIMISTIC)
 844                 addr_flags |= IFA_F_OPTIMISTIC;
 845
 846         ift = !max_addresses ||
 847               ipv6_count_addresses(idev) < max_addresses ?
 848                 ipv6_add_addr(idev, &addr, tmp_plen,
 849                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 850                               addr_flags) : NULL;
 851         if (!ift || IS_ERR(ift)) {
 852                 in6_ifa_put(ifp);
 853                 in6_dev_put(idev);
 854                 printk(KERN_INFO
 855                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 856                 tmpaddr = &addr;
 857                 write_lock(&idev->lock);
 858                 goto retry;
 859         }
 860
 861         spin_lock_bh(&ift->lock);
 862         ift->ifpub = ifp;
 863         ift->valid_lft = tmp_valid_lft;
 864         ift->prefered_lft = tmp_prefered_lft;
 865         ift->cstamp = tmp_cstamp;
 866         ift->tstamp = tmp_tstamp;
 867         spin_unlock_bh(&ift->lock);
 868
 869         addrconf_dad_start(ift, 0);
 870         in6_ifa_put(ift);
 871         in6_dev_put(idev);
 872 out:
 873         return ret;
 874 }
 875 #endif
 876
 877 /*
 878  *      Choose an appropriate source address (RFC3484)
 879  */
 880 struct ipv6_saddr_score {
 881         int             addr_type;
 882         unsigned int    attrs;
 883         int             matchlen;
 884         int             scope;
 885         unsigned int    rule;
 886 };
 887
 888 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 889 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 890 #define IPV6_SADDR_SCORE_HOA            0x0008
 891 #define IPV6_SADDR_SCORE_OIF            0x0010
 892 #define IPV6_SADDR_SCORE_LABEL          0x0020
 893 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 894
 895 static inline int ipv6_saddr_preferred(int type)
 896 {
 897         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 898                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 899                 return 1;
 900         return 0;
 901 }
 902
 903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 904                        struct in6_addr *daddr, struct in6_addr *saddr)
 905 {
 906         struct ipv6_saddr_score hiscore;
 907         struct inet6_ifaddr *ifa_result = NULL;
 908         struct net *net = daddr_dev->nd_net;
 909         int daddr_type = __ipv6_addr_type(daddr);
 910         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 911         int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
 912         u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
 913         struct net_device *dev;
 914
 915         memset(&hiscore, 0, sizeof(hiscore));
 916
 917         read_lock(&dev_base_lock);
 918         rcu_read_lock();
 919
 920         for_each_netdev(net, dev) {
 921                 struct inet6_dev *idev;
 922                 struct inet6_ifaddr *ifa;
 923
 924                 /* Rule 0: Candidate Source Address (section 4)
 925                  *  - multicast and link-local destination address,
 926                  *    the set of candidate source address MUST only
 927                  *    include addresses assigned to interfaces
 928                  *    belonging to the same link as the outgoing
 929                  *    interface.
 930                  * (- For site-local destination addresses, the
 931                  *    set of candidate source addresses MUST only
 932                  *    include addresses assigned to interfaces
 933                  *    belonging to the same site as the outgoing
 934                  *    interface.)
 935                  */
 936                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 937                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 938                     daddr_dev && dev != daddr_dev)
 939                         continue;
 940
 941                 idev = __in6_dev_get(dev);
 942                 if (!idev)
 943                         continue;
 944
 945                 read_lock_bh(&idev->lock);
 946                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 947                         struct ipv6_saddr_score score;
 948
 949                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 950
 951                         /* Rule 0:
 952                          * - Tentative Address (RFC2462 section 5.4)
 953                          *  - A tentative address is not considered
 954                          *    "assigned to an interface" in the traditional
 955                          *    sense, unless it is also flagged as optimistic.
 956                          * - Candidate Source Address (section 4)
 957                          *  - In any case, anycast addresses, multicast
 958                          *    addresses, and the unspecified address MUST
 959                          *    NOT be included in a candidate set.
 960                          */
 961                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 962                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 963                                 continue;
 964                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 965                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 966                                 LIMIT_NETDEBUG(KERN_DEBUG
 967                                                "ADDRCONF: unspecified / multicast address "
 968                                                "assigned as unicast address on %s",
 969                                                dev->name);
 970                                 continue;
 971                         }
 972
 973                         score.attrs = 0;
 974                         score.matchlen = 0;
 975                         score.scope = 0;
 976                         score.rule = 0;
 977
 978                         if (ifa_result == NULL) {
 979                                 /* record it if the first available entry */
 980                                 goto record_it;
 981                         }
 982
 983                         /* Rule 1: Prefer same address */
 984                         if (hiscore.rule < 1) {
 985                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 986                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 987                                 hiscore.rule++;
 988                         }
 989                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 990                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 991                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 992                                         score.rule = 1;
 993                                         goto record_it;
 994                                 }
 995                         } else {
 996                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 997                                         continue;
 998                         }
 999
1000                         /* Rule 2: Prefer appropriate scope */
1001                         if (hiscore.rule < 2) {
1002                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1003                                 hiscore.rule++;
1004                         }
1005                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1006                         if (hiscore.scope < score.scope) {
1007                                 if (hiscore.scope < daddr_scope) {
1008                                         score.rule = 2;
1009                                         goto record_it;
1010                                 } else
1011                                         continue;
1012                         } else if (score.scope < hiscore.scope) {
1013                                 if (score.scope < daddr_scope)
1014                                         break; /* addresses sorted by scope */
1015                                 else {
1016                                         score.rule = 2;
1017                                         goto record_it;
1018                                 }
1019                         }
1020
1021                         /* Rule 3: Avoid deprecated and optimistic addresses */
1022                         if (hiscore.rule < 3) {
1023                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1024                                    (((ifa_result->flags &
1025                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1026                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1027                                 hiscore.rule++;
1028                         }
1029                         if (ipv6_saddr_preferred(score.addr_type) ||
1030                            (((ifa->flags &
1031                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1032                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1033                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1034                                         score.rule = 3;
1035                                         goto record_it;
1036                                 }
1037                         } else {
1038                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1039                                         continue;
1040                         }
1041
1042                         /* Rule 4: Prefer home address */
1043 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1044                         if (hiscore.rule < 4) {
1045                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1046                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1047                                 hiscore.rule++;
1048                         }
1049                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1050                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1051                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1052                                         score.rule = 4;
1053                                         goto record_it;
1054                                 }
1055                         } else {
1056                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1057                                         continue;
1058                         }
1059 #else
1060                         if (hiscore.rule < 4)
1061                                 hiscore.rule++;
1062 #endif
1063
1064                         /* Rule 5: Prefer outgoing interface */
1065                         if (hiscore.rule < 5) {
1066                                 if (daddr_dev == NULL ||
1067                                     daddr_dev == ifa_result->idev->dev)
1068                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1069                                 hiscore.rule++;
1070                         }
1071                         if (daddr_dev == NULL ||
1072                             daddr_dev == ifa->idev->dev) {
1073                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1074                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1075                                         score.rule = 5;
1076                                         goto record_it;
1077                                 }
1078                         } else {
1079                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1080                                         continue;
1081                         }
1082
1083                         /* Rule 6: Prefer matching label */
1084                         if (hiscore.rule < 6) {
1085                                 if (ipv6_addr_label(&ifa_result->addr,
1086                                                     hiscore.addr_type,
1087                                                     ifa_result->idev->dev->ifindex) == daddr_label)
1088                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1089                                 hiscore.rule++;
1090                         }
1091                         if (ipv6_addr_label(&ifa->addr,
1092                                             score.addr_type,
1093                                             ifa->idev->dev->ifindex) == daddr_label) {
1094                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1095                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1096                                         score.rule = 6;
1097                                         goto record_it;
1098                                 }
1099                         } else {
1100                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1101                                         continue;
1102                         }
1103
1104 #ifdef CONFIG_IPV6_PRIVACY
1105                         /* Rule 7: Prefer public address
1106                          * Note: prefer temprary address if use_tempaddr >= 2
1107                          */
1108                         if (hiscore.rule < 7) {
1109                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1110                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1111                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1112                                 hiscore.rule++;
1113                         }
1114                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1115                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1116                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1117                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1118                                         score.rule = 7;
1119                                         goto record_it;
1120                                 }
1121                         } else {
1122                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1123                                         continue;
1124                         }
1125 #else
1126                         if (hiscore.rule < 7)
1127                                 hiscore.rule++;
1128 #endif
1129
1130                         /* Skip rule 8 for orchid -> non-orchid address pairs. */
1131                         if (ipv6_addr_orchid(&ifa->addr) && !ipv6_addr_orchid(daddr))
1132                                 continue;
1133
1134                         /* Rule 8: Use longest matching prefix */
1135                         if (hiscore.rule < 8) {
1136                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1137                                 hiscore.rule++;
1138                         }
1139                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1140                         if (score.matchlen > hiscore.matchlen) {
1141                                 score.rule = 8;
1142                                 goto record_it;
1143                         }
1144 #if 0
1145                         else if (score.matchlen < hiscore.matchlen)
1146                                 continue;
1147 #endif
1148
1149                         /* Final Rule: choose first available one */
1150                         continue;
1151 record_it:
1152                         if (ifa_result)
1153                                 in6_ifa_put(ifa_result);
1154                         in6_ifa_hold(ifa);
1155                         ifa_result = ifa;
1156                         hiscore = score;
1157                 }
1158                 read_unlock_bh(&idev->lock);
1159         }
1160         rcu_read_unlock();
1161         read_unlock(&dev_base_lock);
1162
1163         if (!ifa_result)
1164                 return -EADDRNOTAVAIL;
1165
1166         ipv6_addr_copy(saddr, &ifa_result->addr);
1167         in6_ifa_put(ifa_result);
1168         return 0;
1169 }
1170
1171 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1172
1173 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1174                     unsigned char banned_flags)
1175 {
1176         struct inet6_dev *idev;
1177         int err = -EADDRNOTAVAIL;
1178
1179         rcu_read_lock();
1180         if ((idev = __in6_dev_get(dev)) != NULL) {
1181                 struct inet6_ifaddr *ifp;
1182
1183                 read_lock_bh(&idev->lock);
1184                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1185                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1186                                 ipv6_addr_copy(addr, &ifp->addr);
1187                                 err = 0;
1188                                 break;
1189                         }
1190                 }
1191                 read_unlock_bh(&idev->lock);
1192         }
1193         rcu_read_unlock();
1194         return err;
1195 }
1196
1197 static int ipv6_count_addresses(struct inet6_dev *idev)
1198 {
1199         int cnt = 0;
1200         struct inet6_ifaddr *ifp;
1201
1202         read_lock_bh(&idev->lock);
1203         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1204                 cnt++;
1205         read_unlock_bh(&idev->lock);
1206         return cnt;
1207 }
1208
1209 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1210                   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 (ifp->idev->dev->nd_net != net)
1218                         continue;
1219                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1220                     !(ifp->flags&IFA_F_TENTATIVE)) {
1221                         if (dev == NULL || ifp->idev->dev == dev ||
1222                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1223                                 break;
1224                 }
1225         }
1226         read_unlock_bh(&addrconf_hash_lock);
1227         return ifp != NULL;
1228 }
1229 EXPORT_SYMBOL(ipv6_chk_addr);
1230
1231 static
1232 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1233                        struct net_device *dev)
1234 {
1235         struct inet6_ifaddr * ifp;
1236         u8 hash = ipv6_addr_hash(addr);
1237
1238         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1239                 if (ifp->idev->dev->nd_net != net)
1240                         continue;
1241                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1242                         if (dev == NULL || ifp->idev->dev == dev)
1243                                 break;
1244                 }
1245         }
1246         return ifp != NULL;
1247 }
1248
1249 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1250                                      struct net_device *dev, int strict)
1251 {
1252         struct inet6_ifaddr * ifp;
1253         u8 hash = ipv6_addr_hash(addr);
1254
1255         read_lock_bh(&addrconf_hash_lock);
1256         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1257                 if (ifp->idev->dev->nd_net != net)
1258                         continue;
1259                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1260                         if (dev == NULL || ifp->idev->dev == dev ||
1261                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1262                                 in6_ifa_hold(ifp);
1263                                 break;
1264                         }
1265                 }
1266         }
1267         read_unlock_bh(&addrconf_hash_lock);
1268
1269         return ifp;
1270 }
1271
1272 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1273 {
1274         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1275         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1276         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1277         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1278         int sk_ipv6only = ipv6_only_sock(sk);
1279         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1280         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1281         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1282
1283         if (!sk2_rcv_saddr && !sk_ipv6only)
1284                 return 1;
1285
1286         if (addr_type2 == IPV6_ADDR_ANY &&
1287             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1288                 return 1;
1289
1290         if (addr_type == IPV6_ADDR_ANY &&
1291             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1292                 return 1;
1293
1294         if (sk2_rcv_saddr6 &&
1295             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1296                 return 1;
1297
1298         if (addr_type == IPV6_ADDR_MAPPED &&
1299             !sk2_ipv6only &&
1300             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1301                 return 1;
1302
1303         return 0;
1304 }
1305
1306 /* Gets referenced address, destroys ifaddr */
1307
1308 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1309 {
1310         if (ifp->flags&IFA_F_PERMANENT) {
1311                 spin_lock_bh(&ifp->lock);
1312                 addrconf_del_timer(ifp);
1313                 ifp->flags |= IFA_F_TENTATIVE;
1314                 spin_unlock_bh(&ifp->lock);
1315                 in6_ifa_put(ifp);
1316 #ifdef CONFIG_IPV6_PRIVACY
1317         } else if (ifp->flags&IFA_F_TEMPORARY) {
1318                 struct inet6_ifaddr *ifpub;
1319                 spin_lock_bh(&ifp->lock);
1320                 ifpub = ifp->ifpub;
1321                 if (ifpub) {
1322                         in6_ifa_hold(ifpub);
1323                         spin_unlock_bh(&ifp->lock);
1324                         ipv6_create_tempaddr(ifpub, ifp);
1325                         in6_ifa_put(ifpub);
1326                 } else {
1327                         spin_unlock_bh(&ifp->lock);
1328                 }
1329                 ipv6_del_addr(ifp);
1330 #endif
1331         } else
1332                 ipv6_del_addr(ifp);
1333 }
1334
1335 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1336 {
1337         if (net_ratelimit())
1338                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1339         addrconf_dad_stop(ifp);
1340 }
1341
1342 /* Join to solicited addr multicast group. */
1343
1344 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1345 {
1346         struct in6_addr maddr;
1347
1348         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1349                 return;
1350
1351         addrconf_addr_solict_mult(addr, &maddr);
1352         ipv6_dev_mc_inc(dev, &maddr);
1353 }
1354
1355 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1356 {
1357         struct in6_addr maddr;
1358
1359         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1360                 return;
1361
1362         addrconf_addr_solict_mult(addr, &maddr);
1363         __ipv6_dev_mc_dec(idev, &maddr);
1364 }
1365
1366 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1367 {
1368         struct in6_addr addr;
1369         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1370         if (ipv6_addr_any(&addr))
1371                 return;
1372         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1373 }
1374
1375 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1376 {
1377         struct in6_addr addr;
1378         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1379         if (ipv6_addr_any(&addr))
1380                 return;
1381         __ipv6_dev_ac_dec(ifp->idev, &addr);
1382 }
1383
1384 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1385 {
1386         if (dev->addr_len != ETH_ALEN)
1387                 return -1;
1388         memcpy(eui, dev->dev_addr, 3);
1389         memcpy(eui + 5, dev->dev_addr + 3, 3);
1390
1391         /*
1392          * The zSeries OSA network cards can be shared among various
1393          * OS instances, but the OSA cards have only one MAC address.
1394          * This leads to duplicate address conflicts in conjunction
1395          * with IPv6 if more than one instance uses the same card.
1396          *
1397          * The driver for these cards can deliver a unique 16-bit
1398          * identifier for each instance sharing the same card.  It is
1399          * placed instead of 0xFFFE in the interface identifier.  The
1400          * "u" bit of the interface identifier is not inverted in this
1401          * case.  Hence the resulting interface identifier has local
1402          * scope according to RFC2373.
1403          */
1404         if (dev->dev_id) {
1405                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1406                 eui[4] = dev->dev_id & 0xFF;
1407         } else {
1408                 eui[3] = 0xFF;
1409                 eui[4] = 0xFE;
1410                 eui[0] ^= 2;
1411         }
1412         return 0;
1413 }
1414
1415 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1416 {
1417         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1418         if (dev->addr_len != ARCNET_ALEN)
1419                 return -1;
1420         memset(eui, 0, 7);
1421         eui[7] = *(u8*)dev->dev_addr;
1422         return 0;
1423 }
1424
1425 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1426 {
1427         if (dev->addr_len != INFINIBAND_ALEN)
1428                 return -1;
1429         memcpy(eui, dev->dev_addr + 12, 8);
1430         eui[0] |= 2;
1431         return 0;
1432 }
1433
1434 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1435 {
1436         switch (dev->type) {
1437         case ARPHRD_ETHER:
1438         case ARPHRD_FDDI:
1439         case ARPHRD_IEEE802_TR:
1440                 return addrconf_ifid_eui48(eui, dev);
1441         case ARPHRD_ARCNET:
1442                 return addrconf_ifid_arcnet(eui, dev);
1443         case ARPHRD_INFINIBAND:
1444                 return addrconf_ifid_infiniband(eui, dev);
1445         case ARPHRD_SIT:
1446                 if (dev->priv_flags & IFF_ISATAP)
1447                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1448         }
1449         return -1;
1450 }
1451
1452 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1453 {
1454         int err = -1;
1455         struct inet6_ifaddr *ifp;
1456
1457         read_lock_bh(&idev->lock);
1458         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1459                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1460                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1461                         err = 0;
1462                         break;
1463                 }
1464         }
1465         read_unlock_bh(&idev->lock);
1466         return err;
1467 }
1468
1469 #ifdef CONFIG_IPV6_PRIVACY
1470 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1471 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1472 {
1473 regen:
1474         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1475         idev->rndid[0] &= ~0x02;
1476
1477         /*
1478          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1479          * check if generated address is not inappropriate
1480          *
1481          *  - Reserved subnet anycast (RFC 2526)
1482          *      11111101 11....11 1xxxxxxx
1483          *  - ISATAP (RFC4214) 6.1
1484          *      00-00-5E-FE-xx-xx-xx-xx
1485          *  - value 0
1486          *  - XXX: already assigned to an address on the device
1487          */
1488         if (idev->rndid[0] == 0xfd &&
1489             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1490             (idev->rndid[7]&0x80))
1491                 goto regen;
1492         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1493                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1494                         goto regen;
1495                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1496                         goto regen;
1497         }
1498
1499         return 0;
1500 }
1501
1502 static void ipv6_regen_rndid(unsigned long data)
1503 {
1504         struct inet6_dev *idev = (struct inet6_dev *) data;
1505         unsigned long expires;
1506
1507         rcu_read_lock_bh();
1508         write_lock_bh(&idev->lock);
1509
1510         if (idev->dead)
1511                 goto out;
1512
1513         if (__ipv6_regen_rndid(idev) < 0)
1514                 goto out;
1515
1516         expires = jiffies +
1517                 idev->cnf.temp_prefered_lft * HZ -
1518                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1519         if (time_before(expires, jiffies)) {
1520                 printk(KERN_WARNING
1521                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1522                         idev->dev->name);
1523                 goto out;
1524         }
1525
1526         if (!mod_timer(&idev->regen_timer, expires))
1527                 in6_dev_hold(idev);
1528
1529 out:
1530         write_unlock_bh(&idev->lock);
1531         rcu_read_unlock_bh();
1532         in6_dev_put(idev);
1533 }
1534
1535 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1536         int ret = 0;
1537
1538         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1539                 ret = __ipv6_regen_rndid(idev);
1540         return ret;
1541 }
1542 #endif
1543
1544 /*
1545  *      Add prefix route.
1546  */
1547
1548 static void
1549 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1550                       unsigned long expires, u32 flags)
1551 {
1552         struct fib6_config cfg = {
1553                 .fc_table = RT6_TABLE_PREFIX,
1554                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1555                 .fc_ifindex = dev->ifindex,
1556                 .fc_expires = expires,
1557                 .fc_dst_len = plen,
1558                 .fc_flags = RTF_UP | flags,
1559                 .fc_nlinfo.nl_net = dev->nd_net,
1560         };
1561
1562         ipv6_addr_copy(&cfg.fc_dst, pfx);
1563
1564         /* Prevent useless cloning on PtP SIT.
1565            This thing is done here expecting that the whole
1566            class of non-broadcast devices need not cloning.
1567          */
1568 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1569         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1570                 cfg.fc_flags |= RTF_NONEXTHOP;
1571 #endif
1572
1573         ip6_route_add(&cfg);
1574 }
1575
1576 /* Create "default" multicast route to the interface */
1577
1578 static void addrconf_add_mroute(struct net_device *dev)
1579 {
1580         struct fib6_config cfg = {
1581                 .fc_table = RT6_TABLE_LOCAL,
1582                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1583                 .fc_ifindex = dev->ifindex,
1584                 .fc_dst_len = 8,
1585                 .fc_flags = RTF_UP,
1586                 .fc_nlinfo.nl_net = dev->nd_net,
1587         };
1588
1589         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1590
1591         ip6_route_add(&cfg);
1592 }
1593
1594 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1595 static void sit_route_add(struct net_device *dev)
1596 {
1597         struct fib6_config cfg = {
1598                 .fc_table = RT6_TABLE_MAIN,
1599                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1600                 .fc_ifindex = dev->ifindex,
1601                 .fc_dst_len = 96,
1602                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1603                 .fc_nlinfo.nl_net = dev->nd_net,
1604         };
1605
1606         /* prefix length - 96 bits "::d.d.d.d" */
1607         ip6_route_add(&cfg);
1608 }
1609 #endif
1610
1611 static void addrconf_add_lroute(struct net_device *dev)
1612 {
1613         struct in6_addr addr;
1614
1615         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1616         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1617 }
1618
1619 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1620 {
1621         struct inet6_dev *idev;
1622
1623         ASSERT_RTNL();
1624
1625         if ((idev = ipv6_find_idev(dev)) == NULL)
1626                 return NULL;
1627
1628         /* Add default multicast route */
1629         addrconf_add_mroute(dev);
1630
1631         /* Add link local route */
1632         addrconf_add_lroute(dev);
1633         return idev;
1634 }
1635
1636 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1637 {
1638         struct prefix_info *pinfo;
1639         __u32 valid_lft;
1640         __u32 prefered_lft;
1641         int addr_type;
1642         unsigned long rt_expires;
1643         struct inet6_dev *in6_dev;
1644
1645         pinfo = (struct prefix_info *) opt;
1646
1647         if (len < sizeof(struct prefix_info)) {
1648                 ADBG(("addrconf: prefix option too short\n"));
1649                 return;
1650         }
1651
1652         /*
1653          *      Validation checks ([ADDRCONF], page 19)
1654          */
1655
1656         addr_type = ipv6_addr_type(&pinfo->prefix);
1657
1658         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1659                 return;
1660
1661         valid_lft = ntohl(pinfo->valid);
1662         prefered_lft = ntohl(pinfo->prefered);
1663
1664         if (prefered_lft > valid_lft) {
1665                 if (net_ratelimit())
1666                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1667                 return;
1668         }
1669
1670         in6_dev = in6_dev_get(dev);
1671
1672         if (in6_dev == NULL) {
1673                 if (net_ratelimit())
1674                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1675                 return;
1676         }
1677
1678         /*
1679          *      Two things going on here:
1680          *      1) Add routes for on-link prefixes
1681          *      2) Configure prefixes with the auto flag set
1682          */
1683
1684         /* Avoid arithmetic overflow. Really, we could
1685            save rt_expires in seconds, likely valid_lft,
1686            but it would require division in fib gc, that it
1687            not good.
1688          */
1689         if (valid_lft >= 0x7FFFFFFF/HZ)
1690                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1691         else
1692                 rt_expires = valid_lft * HZ;
1693
1694         /*
1695          * We convert this (in jiffies) to clock_t later.
1696          * Avoid arithmetic overflow there as well.
1697          * Overflow can happen only if HZ < USER_HZ.
1698          */
1699         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1700                 rt_expires = 0x7FFFFFFF / USER_HZ;
1701
1702         if (pinfo->onlink) {
1703                 struct rt6_info *rt;
1704                 rt = rt6_lookup(dev->nd_net, &pinfo->prefix, NULL,
1705                                 dev->ifindex, 1);
1706
1707                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1708                         if (rt->rt6i_flags&RTF_EXPIRES) {
1709                                 if (valid_lft == 0) {
1710                                         ip6_del_rt(rt);
1711                                         rt = NULL;
1712                                 } else {
1713                                         rt->rt6i_expires = jiffies + rt_expires;
1714                                 }
1715                         }
1716                 } else if (valid_lft) {
1717                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1718                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1719                 }
1720                 if (rt)
1721                         dst_release(&rt->u.dst);
1722         }
1723
1724         /* Try to figure out our local address for this prefix */
1725
1726         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1727                 struct inet6_ifaddr * ifp;
1728                 struct in6_addr addr;
1729                 int create = 0, update_lft = 0;
1730
1731                 if (pinfo->prefix_len == 64) {
1732                         memcpy(&addr, &pinfo->prefix, 8);
1733                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1734                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1735                                 in6_dev_put(in6_dev);
1736                                 return;
1737                         }
1738                         goto ok;
1739                 }
1740                 if (net_ratelimit())
1741                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1742                                pinfo->prefix_len);
1743                 in6_dev_put(in6_dev);
1744                 return;
1745
1746 ok:
1747
1748                 ifp = ipv6_get_ifaddr(dev->nd_net, &addr, dev, 1);
1749
1750                 if (ifp == NULL && valid_lft) {
1751                         int max_addresses = in6_dev->cnf.max_addresses;
1752                         u32 addr_flags = 0;
1753
1754 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1755                         if (in6_dev->cnf.optimistic_dad &&
1756                             !ipv6_devconf.forwarding)
1757                                 addr_flags = IFA_F_OPTIMISTIC;
1758 #endif
1759
1760                         /* Do not allow to create too much of autoconfigured
1761                          * addresses; this would be too easy way to crash kernel.
1762                          */
1763                         if (!max_addresses ||
1764                             ipv6_count_addresses(in6_dev) < max_addresses)
1765                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1766                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1767                                                     addr_flags);
1768
1769                         if (!ifp || IS_ERR(ifp)) {
1770                                 in6_dev_put(in6_dev);
1771                                 return;
1772                         }
1773
1774                         update_lft = create = 1;
1775                         ifp->cstamp = jiffies;
1776                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1777                 }
1778
1779                 if (ifp) {
1780                         int flags;
1781                         unsigned long now;
1782 #ifdef CONFIG_IPV6_PRIVACY
1783                         struct inet6_ifaddr *ift;
1784 #endif
1785                         u32 stored_lft;
1786
1787                         /* update lifetime (RFC2462 5.5.3 e) */
1788                         spin_lock(&ifp->lock);
1789                         now = jiffies;
1790                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1791                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1792                         else
1793                                 stored_lft = 0;
1794                         if (!update_lft && stored_lft) {
1795                                 if (valid_lft > MIN_VALID_LIFETIME ||
1796                                     valid_lft > stored_lft)
1797                                         update_lft = 1;
1798                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1799                                         /* valid_lft <= stored_lft is always true */
1800                                         /* XXX: IPsec */
1801                                         update_lft = 0;
1802                                 } else {
1803                                         valid_lft = MIN_VALID_LIFETIME;
1804                                         if (valid_lft < prefered_lft)
1805                                                 prefered_lft = valid_lft;
1806                                         update_lft = 1;
1807                                 }
1808                         }
1809
1810                         if (update_lft) {
1811                                 ifp->valid_lft = valid_lft;
1812                                 ifp->prefered_lft = prefered_lft;
1813                                 ifp->tstamp = now;
1814                                 flags = ifp->flags;
1815                                 ifp->flags &= ~IFA_F_DEPRECATED;
1816                                 spin_unlock(&ifp->lock);
1817
1818                                 if (!(flags&IFA_F_TENTATIVE))
1819                                         ipv6_ifa_notify(0, ifp);
1820                         } else
1821                                 spin_unlock(&ifp->lock);
1822
1823 #ifdef CONFIG_IPV6_PRIVACY
1824                         read_lock_bh(&in6_dev->lock);
1825                         /* update all temporary addresses in the list */
1826                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1827                                 /*
1828                                  * When adjusting the lifetimes of an existing
1829                                  * temporary address, only lower the lifetimes.
1830                                  * Implementations must not increase the
1831                                  * lifetimes of an existing temporary address
1832                                  * when processing a Prefix Information Option.
1833                                  */
1834                                 spin_lock(&ift->lock);
1835                                 flags = ift->flags;
1836                                 if (ift->valid_lft > valid_lft &&
1837                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1838                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1839                                 if (ift->prefered_lft > prefered_lft &&
1840                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1841                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1842                                 spin_unlock(&ift->lock);
1843                                 if (!(flags&IFA_F_TENTATIVE))
1844                                         ipv6_ifa_notify(0, ift);
1845                         }
1846
1847                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1848                                 /*
1849                                  * When a new public address is created as described in [ADDRCONF],
1850                                  * also create a new temporary address.
1851                                  */
1852                                 read_unlock_bh(&in6_dev->lock);
1853                                 ipv6_create_tempaddr(ifp, NULL);
1854                         } else {
1855                                 read_unlock_bh(&in6_dev->lock);
1856                         }
1857 #endif
1858                         in6_ifa_put(ifp);
1859                         addrconf_verify(0);
1860                 }
1861         }
1862         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1863         in6_dev_put(in6_dev);
1864 }
1865
1866 /*
1867  *      Set destination address.
1868  *      Special case for SIT interfaces where we create a new "virtual"
1869  *      device.
1870  */
1871 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1872 {
1873         struct in6_ifreq ireq;
1874         struct net_device *dev;
1875         int err = -EINVAL;
1876
1877         rtnl_lock();
1878
1879         err = -EFAULT;
1880         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1881                 goto err_exit;
1882
1883         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1884
1885         err = -ENODEV;
1886         if (dev == NULL)
1887                 goto err_exit;
1888
1889 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1890         if (dev->type == ARPHRD_SIT) {
1891                 struct ifreq ifr;
1892                 mm_segment_t    oldfs;
1893                 struct ip_tunnel_parm p;
1894
1895                 err = -EADDRNOTAVAIL;
1896                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1897                         goto err_exit;
1898
1899                 memset(&p, 0, sizeof(p));
1900                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1901                 p.iph.saddr = 0;
1902                 p.iph.version = 4;
1903                 p.iph.ihl = 5;
1904                 p.iph.protocol = IPPROTO_IPV6;
1905                 p.iph.ttl = 64;
1906                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1907
1908                 oldfs = get_fs(); set_fs(KERNEL_DS);
1909                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1910                 set_fs(oldfs);
1911
1912                 if (err == 0) {
1913                         err = -ENOBUFS;
1914                         dev = __dev_get_by_name(net, p.name);
1915                         if (!dev)
1916                                 goto err_exit;
1917                         err = dev_open(dev);
1918                 }
1919         }
1920 #endif
1921
1922 err_exit:
1923         rtnl_unlock();
1924         return err;
1925 }
1926
1927 /*
1928  *      Manual configuration of address on an interface
1929  */
1930 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1931                           int plen, __u8 ifa_flags, __u32 prefered_lft,
1932                           __u32 valid_lft)
1933 {
1934         struct inet6_ifaddr *ifp;
1935         struct inet6_dev *idev;
1936         struct net_device *dev;
1937         int scope;
1938         u32 flags = RTF_EXPIRES;
1939
1940         ASSERT_RTNL();
1941
1942         /* check the lifetime */
1943         if (!valid_lft || prefered_lft > valid_lft)
1944                 return -EINVAL;
1945
1946         dev = __dev_get_by_index(net, ifindex);
1947         if (!dev)
1948                 return -ENODEV;
1949
1950         if ((idev = addrconf_add_dev(dev)) == NULL)
1951                 return -ENOBUFS;
1952
1953         scope = ipv6_addr_scope(pfx);
1954
1955         if (valid_lft == INFINITY_LIFE_TIME) {
1956                 ifa_flags |= IFA_F_PERMANENT;
1957                 flags = 0;
1958         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1959                 valid_lft = 0x7FFFFFFF/HZ;
1960
1961         if (prefered_lft == 0)
1962                 ifa_flags |= IFA_F_DEPRECATED;
1963         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1964                  (prefered_lft != INFINITY_LIFE_TIME))
1965                 prefered_lft = 0x7FFFFFFF/HZ;
1966
1967         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1968
1969         if (!IS_ERR(ifp)) {
1970                 spin_lock_bh(&ifp->lock);
1971                 ifp->valid_lft = valid_lft;
1972                 ifp->prefered_lft = prefered_lft;
1973                 ifp->tstamp = jiffies;
1974                 spin_unlock_bh(&ifp->lock);
1975
1976                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1977                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1978                 /*
1979                  * Note that section 3.1 of RFC 4429 indicates
1980                  * that the Optimistic flag should not be set for
1981                  * manually configured addresses
1982                  */
1983                 addrconf_dad_start(ifp, 0);
1984                 in6_ifa_put(ifp);
1985                 addrconf_verify(0);
1986                 return 0;
1987         }
1988
1989         return PTR_ERR(ifp);
1990 }
1991
1992 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
1993                           int plen)
1994 {
1995         struct inet6_ifaddr *ifp;
1996         struct inet6_dev *idev;
1997         struct net_device *dev;
1998
1999         dev = __dev_get_by_index(net, ifindex);
2000         if (!dev)
2001                 return -ENODEV;
2002
2003         if ((idev = __in6_dev_get(dev)) == NULL)
2004                 return -ENXIO;
2005
2006         read_lock_bh(&idev->lock);
2007         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2008                 if (ifp->prefix_len == plen &&
2009                     ipv6_addr_equal(pfx, &ifp->addr)) {
2010                         in6_ifa_hold(ifp);
2011                         read_unlock_bh(&idev->lock);
2012
2013                         ipv6_del_addr(ifp);
2014
2015                         /* If the last address is deleted administratively,
2016                            disable IPv6 on this interface.
2017                          */
2018                         if (idev->addr_list == NULL)
2019                                 addrconf_ifdown(idev->dev, 1);
2020                         return 0;
2021                 }
2022         }
2023         read_unlock_bh(&idev->lock);
2024         return -EADDRNOTAVAIL;
2025 }
2026
2027
2028 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2029 {
2030         struct in6_ifreq ireq;
2031         int err;
2032
2033         if (!capable(CAP_NET_ADMIN))
2034                 return -EPERM;
2035
2036         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2037                 return -EFAULT;
2038
2039         rtnl_lock();
2040         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2041                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2042                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2043         rtnl_unlock();
2044         return err;
2045 }
2046
2047 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2048 {
2049         struct in6_ifreq ireq;
2050         int err;
2051
2052         if (!capable(CAP_NET_ADMIN))
2053                 return -EPERM;
2054
2055         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2056                 return -EFAULT;
2057
2058         rtnl_lock();
2059         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2060                              ireq.ifr6_prefixlen);
2061         rtnl_unlock();
2062         return err;
2063 }
2064
2065 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2066 static void sit_add_v4_addrs(struct inet6_dev *idev)
2067 {
2068         struct inet6_ifaddr * ifp;
2069         struct in6_addr addr;
2070         struct net_device *dev;
2071         struct net *net = idev->dev->nd_net;
2072         int scope;
2073
2074         ASSERT_RTNL();
2075
2076         memset(&addr, 0, sizeof(struct in6_addr));
2077         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2078
2079         if (idev->dev->flags&IFF_POINTOPOINT) {
2080                 addr.s6_addr32[0] = htonl(0xfe800000);
2081                 scope = IFA_LINK;
2082         } else {
2083                 scope = IPV6_ADDR_COMPATv4;
2084         }
2085
2086         if (addr.s6_addr32[3]) {
2087                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2088                 if (!IS_ERR(ifp)) {
2089                         spin_lock_bh(&ifp->lock);
2090                         ifp->flags &= ~IFA_F_TENTATIVE;
2091                         spin_unlock_bh(&ifp->lock);
2092                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2093                         in6_ifa_put(ifp);
2094                 }
2095                 return;
2096         }
2097
2098         for_each_netdev(net, dev) {
2099                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2100                 if (in_dev && (dev->flags & IFF_UP)) {
2101                         struct in_ifaddr * ifa;
2102
2103                         int flag = scope;
2104
2105                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2106                                 int plen;
2107
2108                                 addr.s6_addr32[3] = ifa->ifa_local;
2109
2110                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2111                                         continue;
2112                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2113                                         if (idev->dev->flags&IFF_POINTOPOINT)
2114                                                 continue;
2115                                         flag |= IFA_HOST;
2116                                 }
2117                                 if (idev->dev->flags&IFF_POINTOPOINT)
2118                                         plen = 64;
2119                                 else
2120                                         plen = 96;
2121
2122                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2123                                                     IFA_F_PERMANENT);
2124                                 if (!IS_ERR(ifp)) {
2125                                         spin_lock_bh(&ifp->lock);
2126                                         ifp->flags &= ~IFA_F_TENTATIVE;
2127                                         spin_unlock_bh(&ifp->lock);
2128                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2129                                         in6_ifa_put(ifp);
2130                                 }
2131                         }
2132                 }
2133         }
2134 }
2135 #endif
2136
2137 static void init_loopback(struct net_device *dev)
2138 {
2139         struct inet6_dev  *idev;
2140         struct inet6_ifaddr * ifp;
2141
2142         /* ::1 */
2143
2144         ASSERT_RTNL();
2145
2146         if ((idev = ipv6_find_idev(dev)) == NULL) {
2147                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2148                 return;
2149         }
2150
2151         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2152         if (!IS_ERR(ifp)) {
2153                 spin_lock_bh(&ifp->lock);
2154                 ifp->flags &= ~IFA_F_TENTATIVE;
2155                 spin_unlock_bh(&ifp->lock);
2156                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2157                 in6_ifa_put(ifp);
2158         }
2159 }
2160
2161 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2162 {
2163         struct inet6_ifaddr * ifp;
2164         u32 addr_flags = IFA_F_PERMANENT;
2165
2166 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2167         if (idev->cnf.optimistic_dad &&
2168             !ipv6_devconf.forwarding)
2169                 addr_flags |= IFA_F_OPTIMISTIC;
2170 #endif
2171
2172
2173         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2174         if (!IS_ERR(ifp)) {
2175                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2176                 addrconf_dad_start(ifp, 0);
2177                 in6_ifa_put(ifp);
2178         }
2179 }
2180
2181 static void addrconf_dev_config(struct net_device *dev)
2182 {
2183         struct in6_addr addr;
2184         struct inet6_dev    * idev;
2185
2186         ASSERT_RTNL();
2187
2188         if ((dev->type != ARPHRD_ETHER) &&
2189             (dev->type != ARPHRD_FDDI) &&
2190             (dev->type != ARPHRD_IEEE802_TR) &&
2191             (dev->type != ARPHRD_ARCNET) &&
2192             (dev->type != ARPHRD_INFINIBAND)) {
2193                 /* Alas, we support only Ethernet autoconfiguration. */
2194                 return;
2195         }
2196
2197         idev = addrconf_add_dev(dev);
2198         if (idev == NULL)
2199                 return;
2200
2201         memset(&addr, 0, sizeof(struct in6_addr));
2202         addr.s6_addr32[0] = htonl(0xFE800000);
2203
2204         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2205                 addrconf_add_linklocal(idev, &addr);
2206 }
2207
2208 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2209 static void addrconf_sit_config(struct net_device *dev)
2210 {
2211         struct inet6_dev *idev;
2212
2213         ASSERT_RTNL();
2214
2215         /*
2216          * Configure the tunnel with one of our IPv4
2217          * addresses... we should configure all of
2218          * our v4 addrs in the tunnel
2219          */
2220
2221         if ((idev = ipv6_find_idev(dev)) == NULL) {
2222                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2223                 return;
2224         }
2225
2226         if (dev->priv_flags & IFF_ISATAP) {
2227                 struct in6_addr addr;
2228
2229                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2230                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2231                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2232                         addrconf_add_linklocal(idev, &addr);
2233                 return;
2234         }
2235
2236         sit_add_v4_addrs(idev);
2237
2238         if (dev->flags&IFF_POINTOPOINT) {
2239                 addrconf_add_mroute(dev);
2240                 addrconf_add_lroute(dev);
2241         } else
2242                 sit_route_add(dev);
2243 }
2244 #endif
2245
2246 static inline int
2247 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2248 {
2249         struct in6_addr lladdr;
2250
2251         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2252                 addrconf_add_linklocal(idev, &lladdr);
2253                 return 0;
2254         }
2255         return -1;
2256 }
2257
2258 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2259 {
2260         struct net_device *link_dev;
2261         struct net *net = idev->dev->nd_net;
2262
2263         /* first try to inherit the link-local address from the link device */
2264         if (idev->dev->iflink &&
2265             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2266                 if (!ipv6_inherit_linklocal(idev, link_dev))
2267                         return;
2268         }
2269         /* then try to inherit it from any device */
2270         for_each_netdev(net, link_dev) {
2271                 if (!ipv6_inherit_linklocal(idev, link_dev))
2272                         return;
2273         }
2274         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2275 }
2276
2277 /*
2278  * Autoconfigure tunnel with a link-local address so routing protocols,
2279  * DHCPv6, MLD etc. can be run over the virtual link
2280  */
2281
2282 static void addrconf_ip6_tnl_config(struct net_device *dev)
2283 {
2284         struct inet6_dev *idev;
2285
2286         ASSERT_RTNL();
2287
2288         if ((idev = addrconf_add_dev(dev)) == NULL) {
2289                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2290                 return;
2291         }
2292         ip6_tnl_add_linklocal(idev);
2293 }
2294
2295 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2296                            void * data)
2297 {
2298         struct net_device *dev = (struct net_device *) data;
2299         struct inet6_dev *idev = __in6_dev_get(dev);
2300         int run_pending = 0;
2301         int err;
2302
2303         switch(event) {
2304         case NETDEV_REGISTER:
2305                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2306                         idev = ipv6_add_dev(dev);
2307                         if (!idev)
2308                                 return notifier_from_errno(-ENOMEM);
2309                 }
2310                 break;
2311         case NETDEV_UP:
2312         case NETDEV_CHANGE:
2313                 if (dev->flags & IFF_SLAVE)
2314                         break;
2315
2316                 if (event == NETDEV_UP) {
2317                         if (!addrconf_qdisc_ok(dev)) {
2318                                 /* device is not ready yet. */
2319                                 printk(KERN_INFO
2320                                         "ADDRCONF(NETDEV_UP): %s: "
2321                                         "link is not ready\n",
2322                                         dev->name);
2323                                 break;
2324                         }
2325
2326                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2327                                 idev = ipv6_add_dev(dev);
2328
2329                         if (idev)
2330                                 idev->if_flags |= IF_READY;
2331                 } else {
2332                         if (!addrconf_qdisc_ok(dev)) {
2333                                 /* device is still not ready. */
2334                                 break;
2335                         }
2336
2337                         if (idev) {
2338                                 if (idev->if_flags & IF_READY) {
2339                                         /* device is already configured. */
2340                                         break;
2341                                 }
2342                                 idev->if_flags |= IF_READY;
2343                         }
2344
2345                         printk(KERN_INFO
2346                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2347                                         "link becomes ready\n",
2348                                         dev->name);
2349
2350                         run_pending = 1;
2351                 }
2352
2353                 switch(dev->type) {
2354 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2355                 case ARPHRD_SIT:
2356                         addrconf_sit_config(dev);
2357                         break;
2358 #endif
2359                 case ARPHRD_TUNNEL6:
2360                         addrconf_ip6_tnl_config(dev);
2361                         break;
2362                 case ARPHRD_LOOPBACK:
2363                         init_loopback(dev);
2364                         break;
2365
2366                 default:
2367                         addrconf_dev_config(dev);
2368                         break;
2369                 }
2370                 if (idev) {
2371                         if (run_pending)
2372                                 addrconf_dad_run(idev);
2373
2374                         /* If the MTU changed during the interface down, when the
2375                            interface up, the changed MTU must be reflected in the
2376                            idev as well as routers.
2377                          */
2378                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2379                                 rt6_mtu_change(dev, dev->mtu);
2380                                 idev->cnf.mtu6 = dev->mtu;
2381                         }
2382                         idev->tstamp = jiffies;
2383                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2384                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2385                            stop IPv6 on this interface.
2386                          */
2387                         if (dev->mtu < IPV6_MIN_MTU)
2388                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2389                 }
2390                 break;
2391
2392         case NETDEV_CHANGEMTU:
2393                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2394                         rt6_mtu_change(dev, dev->mtu);
2395                         idev->cnf.mtu6 = dev->mtu;
2396                         break;
2397                 }
2398
2399                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2400                         idev = ipv6_add_dev(dev);
2401                         if (idev)
2402                                 break;
2403                 }
2404
2405                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2406
2407         case NETDEV_DOWN:
2408         case NETDEV_UNREGISTER:
2409                 /*
2410                  *      Remove all addresses from this interface.
2411                  */
2412                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2413                 break;
2414
2415         case NETDEV_CHANGENAME:
2416                 if (idev) {
2417                         snmp6_unregister_dev(idev);
2418                         addrconf_sysctl_unregister(idev);
2419                         addrconf_sysctl_register(idev);
2420                         err = snmp6_register_dev(idev);
2421                         if (err)
2422                                 return notifier_from_errno(err);
2423                 }
2424                 break;
2425         }
2426
2427         return NOTIFY_OK;
2428 }
2429
2430 /*
2431  *      addrconf module should be notified of a device going up
2432  */
2433 static struct notifier_block ipv6_dev_notf = {
2434         .notifier_call = addrconf_notify,
2435         .priority = 0
2436 };
2437
2438 static int addrconf_ifdown(struct net_device *dev, int how)
2439 {
2440         struct inet6_dev *idev;
2441         struct inet6_ifaddr *ifa, **bifa;
2442         struct net *net = dev->nd_net;
2443         int i;
2444
2445         ASSERT_RTNL();
2446
2447         if (dev == init_net.loopback_dev && how == 1)
2448                 how = 0;
2449
2450         rt6_ifdown(net, dev);
2451         neigh_ifdown(&nd_tbl, dev);
2452
2453         idev = __in6_dev_get(dev);
2454         if (idev == NULL)
2455                 return -ENODEV;
2456
2457         /* Step 1: remove reference to ipv6 device from parent device.
2458                    Do not dev_put!
2459          */
2460         if (how == 1) {
2461                 idev->dead = 1;
2462
2463                 /* protected by rtnl_lock */
2464                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2465
2466                 /* Step 1.5: remove snmp6 entry */
2467                 snmp6_unregister_dev(idev);
2468
2469         }
2470
2471         /* Step 2: clear hash table */
2472         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2473                 bifa = &inet6_addr_lst[i];
2474
2475                 write_lock_bh(&addrconf_hash_lock);
2476                 while ((ifa = *bifa) != NULL) {
2477                         if (ifa->idev == idev) {
2478                                 *bifa = ifa->lst_next;
2479                                 ifa->lst_next = NULL;
2480                                 addrconf_del_timer(ifa);
2481                                 in6_ifa_put(ifa);
2482                                 continue;
2483                         }
2484                         bifa = &ifa->lst_next;
2485                 }
2486                 write_unlock_bh(&addrconf_hash_lock);
2487         }
2488
2489         write_lock_bh(&idev->lock);
2490
2491         /* Step 3: clear flags for stateless addrconf */
2492         if (how != 1)
2493                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2494
2495         /* Step 4: clear address list */
2496 #ifdef CONFIG_IPV6_PRIVACY
2497         if (how == 1 && del_timer(&idev->regen_timer))
2498                 in6_dev_put(idev);
2499
2500         /* clear tempaddr list */
2501         while ((ifa = idev->tempaddr_list) != NULL) {
2502                 idev->tempaddr_list = ifa->tmp_next;
2503                 ifa->tmp_next = NULL;
2504                 ifa->dead = 1;
2505                 write_unlock_bh(&idev->lock);
2506                 spin_lock_bh(&ifa->lock);
2507
2508                 if (ifa->ifpub) {
2509                         in6_ifa_put(ifa->ifpub);
2510                         ifa->ifpub = NULL;
2511                 }
2512                 spin_unlock_bh(&ifa->lock);
2513                 in6_ifa_put(ifa);
2514                 write_lock_bh(&idev->lock);
2515         }
2516 #endif
2517         while ((ifa = idev->addr_list) != NULL) {
2518                 idev->addr_list = ifa->if_next;
2519                 ifa->if_next = NULL;
2520                 ifa->dead = 1;
2521                 addrconf_del_timer(ifa);
2522                 write_unlock_bh(&idev->lock);
2523
2524                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2525                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2526                 in6_ifa_put(ifa);
2527
2528                 write_lock_bh(&idev->lock);
2529         }
2530         write_unlock_bh(&idev->lock);
2531
2532         /* Step 5: Discard multicast list */
2533
2534         if (how == 1)
2535                 ipv6_mc_destroy_dev(idev);
2536         else
2537                 ipv6_mc_down(idev);
2538
2539         idev->tstamp = jiffies;
2540
2541         /* Shot the device (if unregistered) */
2542
2543         if (how == 1) {
2544                 addrconf_sysctl_unregister(idev);
2545                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2546                 neigh_ifdown(&nd_tbl, dev);
2547                 in6_dev_put(idev);
2548         }
2549         return 0;
2550 }
2551
2552 static void addrconf_rs_timer(unsigned long data)
2553 {
2554         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2555
2556         if (ifp->idev->cnf.forwarding)
2557                 goto out;
2558
2559         if (ifp->idev->if_flags & IF_RA_RCVD) {
2560                 /*
2561                  *      Announcement received after solicitation
2562                  *      was sent
2563                  */
2564                 goto out;
2565         }
2566
2567         spin_lock(&ifp->lock);
2568         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2569                 struct in6_addr all_routers;
2570
2571                 /* The wait after the last probe can be shorter */
2572                 addrconf_mod_timer(ifp, AC_RS,
2573                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2574                                    ifp->idev->cnf.rtr_solicit_delay :
2575                                    ifp->idev->cnf.rtr_solicit_interval);
2576                 spin_unlock(&ifp->lock);
2577
2578                 ipv6_addr_all_routers(&all_routers);
2579
2580                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2581         } else {
2582                 spin_unlock(&ifp->lock);
2583                 /*
2584                  * Note: we do not support deprecated "all on-link"
2585                  * assumption any longer.
2586                  */
2587                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2588                        ifp->idev->dev->name);
2589         }
2590
2591 out:
2592         in6_ifa_put(ifp);
2593 }
2594
2595 /*
2596  *      Duplicate Address Detection
2597  */
2598 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2599 {
2600         unsigned long rand_num;
2601         struct inet6_dev *idev = ifp->idev;
2602
2603         if (ifp->flags & IFA_F_OPTIMISTIC)
2604                 rand_num = 0;
2605         else
2606                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2607
2608         ifp->probes = idev->cnf.dad_transmits;
2609         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2610 }
2611
2612 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2613 {
2614         struct inet6_dev *idev = ifp->idev;
2615         struct net_device *dev = idev->dev;
2616
2617         addrconf_join_solict(dev, &ifp->addr);
2618
2619         net_srandom(ifp->addr.s6_addr32[3]);
2620
2621         read_lock_bh(&idev->lock);
2622         if (ifp->dead)
2623                 goto out;
2624         spin_lock_bh(&ifp->lock);
2625
2626         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2627             !(ifp->flags&IFA_F_TENTATIVE) ||
2628             ifp->flags & IFA_F_NODAD) {
2629                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2630                 spin_unlock_bh(&ifp->lock);
2631                 read_unlock_bh(&idev->lock);
2632
2633                 addrconf_dad_completed(ifp);
2634                 return;
2635         }
2636
2637         if (!(idev->if_flags & IF_READY)) {
2638                 spin_unlock_bh(&ifp->lock);
2639                 read_unlock_bh(&idev->lock);
2640                 /*
2641                  * If the defice is not ready:
2642                  * - keep it tentative if it is a permanent address.
2643                  * - otherwise, kill it.
2644                  */
2645                 in6_ifa_hold(ifp);
2646                 addrconf_dad_stop(ifp);
2647                 return;
2648         }
2649
2650         /*
2651          * Optimistic nodes can start receiving
2652          * Frames right away
2653          */
2654         if(ifp->flags & IFA_F_OPTIMISTIC)
2655                 ip6_ins_rt(ifp->rt);
2656
2657         addrconf_dad_kick(ifp);
2658         spin_unlock_bh(&ifp->lock);
2659 out:
2660         read_unlock_bh(&idev->lock);
2661 }
2662
2663 static void addrconf_dad_timer(unsigned long data)
2664 {
2665         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2666         struct inet6_dev *idev = ifp->idev;
2667         struct in6_addr unspec;
2668         struct in6_addr mcaddr;
2669
2670         read_lock_bh(&idev->lock);
2671         if (idev->dead) {
2672                 read_unlock_bh(&idev->lock);
2673                 goto out;
2674         }
2675         spin_lock_bh(&ifp->lock);
2676         if (ifp->probes == 0) {
2677                 /*
2678                  * DAD was successful
2679                  */
2680
2681                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2682                 spin_unlock_bh(&ifp->lock);
2683                 read_unlock_bh(&idev->lock);
2684
2685                 addrconf_dad_completed(ifp);
2686
2687                 goto out;
2688         }
2689
2690         ifp->probes--;
2691         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2692         spin_unlock_bh(&ifp->lock);
2693         read_unlock_bh(&idev->lock);
2694
2695         /* send a neighbour solicitation for our addr */
2696         memset(&unspec, 0, sizeof(unspec));
2697         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2698         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2699 out:
2700         in6_ifa_put(ifp);
2701 }
2702
2703 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2704 {
2705         struct net_device *     dev = ifp->idev->dev;
2706
2707         /*
2708          *      Configure the address for reception. Now it is valid.
2709          */
2710
2711         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2712
2713         /* If added prefix is link local and forwarding is off,
2714            start sending router solicitations.
2715          */
2716
2717         if (ifp->idev->cnf.forwarding == 0 &&
2718             ifp->idev->cnf.rtr_solicits > 0 &&
2719             (dev->flags&IFF_LOOPBACK) == 0 &&
2720             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2721                 struct in6_addr all_routers;
2722
2723                 ipv6_addr_all_routers(&all_routers);
2724
2725                 /*
2726                  *      If a host as already performed a random delay
2727                  *      [...] as part of DAD [...] there is no need
2728                  *      to delay again before sending the first RS
2729                  */
2730                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2731
2732                 spin_lock_bh(&ifp->lock);
2733                 ifp->probes = 1;
2734                 ifp->idev->if_flags |= IF_RS_SENT;
2735                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2736                 spin_unlock_bh(&ifp->lock);
2737         }
2738 }
2739
2740 static void addrconf_dad_run(struct inet6_dev *idev) {
2741         struct inet6_ifaddr *ifp;
2742
2743         read_lock_bh(&idev->lock);
2744         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2745                 spin_lock_bh(&ifp->lock);
2746                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2747                         spin_unlock_bh(&ifp->lock);
2748                         continue;
2749                 }
2750                 spin_unlock_bh(&ifp->lock);
2751                 addrconf_dad_kick(ifp);
2752         }
2753         read_unlock_bh(&idev->lock);
2754 }
2755
2756 #ifdef CONFIG_PROC_FS
2757 struct if6_iter_state {
2758         struct seq_net_private p;
2759         int bucket;
2760 };
2761
2762 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2763 {
2764         struct inet6_ifaddr *ifa = NULL;
2765         struct if6_iter_state *state = seq->private;
2766         struct net *net = state->p.net;
2767
2768         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2769                 ifa = inet6_addr_lst[state->bucket];
2770
2771                 while (ifa && ifa->idev->dev->nd_net != net)
2772                         ifa = ifa->lst_next;
2773                 if (ifa)
2774                         break;
2775         }
2776         return ifa;
2777 }
2778
2779 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2780 {
2781         struct if6_iter_state *state = seq->private;
2782         struct net *net = state->p.net;
2783
2784         ifa = ifa->lst_next;
2785 try_again:
2786         if (ifa) {
2787                 if (ifa->idev->dev->nd_net != net) {
2788                         ifa = ifa->lst_next;
2789                         goto try_again;
2790                 }
2791         }
2792
2793         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2794                 ifa = inet6_addr_lst[state->bucket];
2795                 goto try_again;
2796         }
2797
2798         return ifa;
2799 }
2800
2801 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2802 {
2803         struct inet6_ifaddr *ifa = if6_get_first(seq);
2804
2805         if (ifa)
2806                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2807                         --pos;
2808         return pos ? NULL : ifa;
2809 }
2810
2811 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2812         __acquires(addrconf_hash_lock)
2813 {
2814         read_lock_bh(&addrconf_hash_lock);
2815         return if6_get_idx(seq, *pos);
2816 }
2817
2818 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2819 {
2820         struct inet6_ifaddr *ifa;
2821
2822         ifa = if6_get_next(seq, v);
2823         ++*pos;
2824         return ifa;
2825 }
2826
2827 static void if6_seq_stop(struct seq_file *seq, void *v)
2828         __releases(addrconf_hash_lock)
2829 {
2830         read_unlock_bh(&addrconf_hash_lock);
2831 }
2832
2833 static int if6_seq_show(struct seq_file *seq, void *v)
2834 {
2835         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2836         seq_printf(seq,
2837                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2838                    NIP6(ifp->addr),
2839                    ifp->idev->dev->ifindex,
2840                    ifp->prefix_len,
2841                    ifp->scope,
2842                    ifp->flags,
2843                    ifp->idev->dev->name);
2844         return 0;
2845 }
2846
2847 static const struct seq_operations if6_seq_ops = {
2848         .start  = if6_seq_start,
2849         .next   = if6_seq_next,
2850         .show   = if6_seq_show,
2851         .stop   = if6_seq_stop,
2852 };
2853
2854 static int if6_seq_open(struct inode *inode, struct file *file)
2855 {
2856         return seq_open_net(inode, file, &if6_seq_ops,
2857                             sizeof(struct if6_iter_state));
2858 }
2859
2860 static const struct file_operations if6_fops = {
2861         .owner          = THIS_MODULE,
2862         .open           = if6_seq_open,
2863         .read           = seq_read,
2864         .llseek         = seq_lseek,
2865         .release        = seq_release_net,
2866 };
2867
2868 static int if6_proc_net_init(struct net *net)
2869 {
2870         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2871                 return -ENOMEM;
2872         return 0;
2873 }
2874
2875 static void if6_proc_net_exit(struct net *net)
2876 {
2877        proc_net_remove(net, "if_inet6");
2878 }
2879
2880 static struct pernet_operations if6_proc_net_ops = {
2881        .init = if6_proc_net_init,
2882        .exit = if6_proc_net_exit,
2883 };
2884
2885 int __init if6_proc_init(void)
2886 {
2887         return register_pernet_subsys(&if6_proc_net_ops);
2888 }
2889
2890 void if6_proc_exit(void)
2891 {
2892         unregister_pernet_subsys(&if6_proc_net_ops);
2893 }
2894 #endif  /* CONFIG_PROC_FS */
2895
2896 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2897 /* Check if address is a home address configured on any interface. */
2898 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2899 {
2900         int ret = 0;
2901         struct inet6_ifaddr * ifp;
2902         u8 hash = ipv6_addr_hash(addr);
2903         read_lock_bh(&addrconf_hash_lock);
2904         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2905                 if (ifp->idev->dev->nd_net != net)
2906                         continue;
2907                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2908                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2909                         ret = 1;
2910                         break;
2911                 }
2912         }
2913         read_unlock_bh(&addrconf_hash_lock);
2914         return ret;
2915 }
2916 #endif
2917
2918 /*
2919  *      Periodic address status verification
2920  */
2921
2922 static void addrconf_verify(unsigned long foo)
2923 {
2924         struct inet6_ifaddr *ifp;
2925         unsigned long now, next;
2926         int i;
2927
2928         spin_lock_bh(&addrconf_verify_lock);
2929         now = jiffies;
2930         next = now + ADDR_CHECK_FREQUENCY;
2931
2932         del_timer(&addr_chk_timer);
2933
2934         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2935
2936 restart:
2937                 read_lock(&addrconf_hash_lock);
2938                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2939                         unsigned long age;
2940 #ifdef CONFIG_IPV6_PRIVACY
2941                         unsigned long regen_advance;
2942 #endif
2943
2944                         if (ifp->flags & IFA_F_PERMANENT)
2945                                 continue;
2946
2947                         spin_lock(&ifp->lock);
2948                         age = (now - ifp->tstamp) / HZ;
2949
2950 #ifdef CONFIG_IPV6_PRIVACY
2951                         regen_advance = ifp->idev->cnf.regen_max_retry *
2952                                         ifp->idev->cnf.dad_transmits *
2953                                         ifp->idev->nd_parms->retrans_time / HZ;
2954 #endif
2955
2956                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2957                             age >= ifp->valid_lft) {
2958                                 spin_unlock(&ifp->lock);
2959                                 in6_ifa_hold(ifp);
2960                                 read_unlock(&addrconf_hash_lock);
2961                                 ipv6_del_addr(ifp);
2962                                 goto restart;
2963                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2964                                 spin_unlock(&ifp->lock);
2965                                 continue;
2966                         } else if (age >= ifp->prefered_lft) {
2967                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2968                                 int deprecate = 0;
2969
2970                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2971                                         deprecate = 1;
2972                                         ifp->flags |= IFA_F_DEPRECATED;
2973                                 }
2974
2975                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2976                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2977
2978                                 spin_unlock(&ifp->lock);
2979
2980                                 if (deprecate) {
2981                                         in6_ifa_hold(ifp);
2982                                         read_unlock(&addrconf_hash_lock);
2983
2984                                         ipv6_ifa_notify(0, ifp);
2985                                         in6_ifa_put(ifp);
2986                                         goto restart;
2987                                 }
2988 #ifdef CONFIG_IPV6_PRIVACY
2989                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2990                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2991                                 if (age >= ifp->prefered_lft - regen_advance) {
2992                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2993                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2994                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2995                                         if (!ifp->regen_count && ifpub) {
2996                                                 ifp->regen_count++;
2997                                                 in6_ifa_hold(ifp);
2998                                                 in6_ifa_hold(ifpub);
2999                                                 spin_unlock(&ifp->lock);
3000                                                 read_unlock(&addrconf_hash_lock);
3001                                                 spin_lock(&ifpub->lock);
3002                                                 ifpub->regen_count = 0;
3003                                                 spin_unlock(&ifpub->lock);
3004                                                 ipv6_create_tempaddr(ifpub, ifp);
3005                                                 in6_ifa_put(ifpub);
3006                                                 in6_ifa_put(ifp);
3007                                                 goto restart;
3008                                         }
3009                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3010                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3011                                 spin_unlock(&ifp->lock);
3012 #endif
3013                         } else {
3014                                 /* ifp->prefered_lft <= ifp->valid_lft */
3015                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3016                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3017                                 spin_unlock(&ifp->lock);
3018                         }
3019                 }
3020                 read_unlock(&addrconf_hash_lock);
3021         }
3022
3023         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3024         add_timer(&addr_chk_timer);
3025         spin_unlock_bh(&addrconf_verify_lock);
3026 }
3027
3028 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3029 {
3030         struct in6_addr *pfx = NULL;
3031
3032         if (addr)
3033                 pfx = nla_data(addr);
3034
3035         if (local) {
3036                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3037                         pfx = NULL;
3038                 else
3039                         pfx = nla_data(local);
3040         }
3041
3042         return pfx;
3043 }
3044
3045 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3046         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3047         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3048         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3049 };
3050
3051 static int
3052 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3053 {
3054         struct net *net = skb->sk->sk_net;
3055         struct ifaddrmsg *ifm;
3056         struct nlattr *tb[IFA_MAX+1];
3057         struct in6_addr *pfx;
3058         int err;
3059
3060         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3061         if (err < 0)
3062                 return err;
3063
3064         ifm = nlmsg_data(nlh);
3065         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3066         if (pfx == NULL)
3067                 return -EINVAL;
3068
3069         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3070 }
3071
3072 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3073                              u32 prefered_lft, u32 valid_lft)
3074 {
3075         u32 flags = RTF_EXPIRES;
3076
3077         if (!valid_lft || (prefered_lft > valid_lft))
3078                 return -EINVAL;
3079
3080         if (valid_lft == INFINITY_LIFE_TIME) {
3081                 ifa_flags |= IFA_F_PERMANENT;
3082                 flags = 0;
3083         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3084                 valid_lft = 0x7FFFFFFF/HZ;
3085
3086         if (prefered_lft == 0)
3087                 ifa_flags |= IFA_F_DEPRECATED;
3088         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3089                  (prefered_lft != INFINITY_LIFE_TIME))
3090                 prefered_lft = 0x7FFFFFFF/HZ;
3091
3092         spin_lock_bh(&ifp->lock);
3093         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3094         ifp->tstamp = jiffies;
3095         ifp->valid_lft = valid_lft;
3096         ifp->prefered_lft = prefered_lft;
3097
3098         spin_unlock_bh(&ifp->lock);
3099         if (!(ifp->flags&IFA_F_TENTATIVE))
3100                 ipv6_ifa_notify(0, ifp);
3101
3102         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3103                               jiffies_to_clock_t(valid_lft * HZ), flags);
3104         addrconf_verify(0);
3105
3106         return 0;
3107 }
3108
3109 static int
3110 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3111 {
3112         struct net *net = skb->sk->sk_net;
3113         struct ifaddrmsg *ifm;
3114         struct nlattr *tb[IFA_MAX+1];
3115         struct in6_addr *pfx;
3116         struct inet6_ifaddr *ifa;
3117         struct net_device *dev;
3118         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3119         u8 ifa_flags;
3120         int err;
3121
3122         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3123         if (err < 0)
3124                 return err;
3125
3126         ifm = nlmsg_data(nlh);
3127         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3128         if (pfx == NULL)
3129                 return -EINVAL;
3130
3131         if (tb[IFA_CACHEINFO]) {
3132                 struct ifa_cacheinfo *ci;
3133
3134                 ci = nla_data(tb[IFA_CACHEINFO]);
3135                 valid_lft = ci->ifa_valid;
3136                 preferred_lft = ci->ifa_prefered;
3137         } else {
3138                 preferred_lft = INFINITY_LIFE_TIME;
3139                 valid_lft = INFINITY_LIFE_TIME;
3140         }
3141
3142         dev =  __dev_get_by_index(net, ifm->ifa_index);
3143         if (dev == NULL)
3144                 return -ENODEV;
3145
3146         /* We ignore other flags so far. */
3147         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3148
3149         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3150         if (ifa == NULL) {
3151                 /*
3152                  * It would be best to check for !NLM_F_CREATE here but
3153                  * userspace alreay relies on not having to provide this.
3154                  */
3155                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3156                                       ifm->ifa_prefixlen, ifa_flags,
3157                                       preferred_lft, valid_lft);
3158         }
3159
3160         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3161             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3162                 err = -EEXIST;
3163         else
3164                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3165
3166         in6_ifa_put(ifa);
3167
3168         return err;
3169 }
3170
3171 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3172                           u8 scope, int ifindex)
3173 {
3174         struct ifaddrmsg *ifm;
3175
3176         ifm = nlmsg_data(nlh);
3177         ifm->ifa_family = AF_INET6;
3178         ifm->ifa_prefixlen = prefixlen;
3179         ifm->ifa_flags = flags;
3180         ifm->ifa_scope = scope;
3181         ifm->ifa_index = ifindex;
3182 }
3183
3184 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3185                          unsigned long tstamp, u32 preferred, u32 valid)
3186 {
3187         struct ifa_cacheinfo ci;
3188
3189         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3190                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3191         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3192                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3193         ci.ifa_prefered = preferred;
3194         ci.ifa_valid = valid;
3195
3196         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3197 }
3198
3199 static inline int rt_scope(int ifa_scope)
3200 {
3201         if (ifa_scope & IFA_HOST)
3202                 return RT_SCOPE_HOST;
3203         else if (ifa_scope & IFA_LINK)
3204                 return RT_SCOPE_LINK;
3205         else if (ifa_scope & IFA_SITE)
3206                 return RT_SCOPE_SITE;
3207         else
3208                 return RT_SCOPE_UNIVERSE;
3209 }
3210
3211 static inline int inet6_ifaddr_msgsize(void)
3212 {
3213         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3214                + nla_total_size(16) /* IFA_ADDRESS */
3215                + nla_total_size(sizeof(struct ifa_cacheinfo));
3216 }
3217
3218 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3219                              u32 pid, u32 seq, int event, unsigned int flags)
3220 {
3221         struct nlmsghdr  *nlh;
3222         u32 preferred, valid;
3223
3224         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3225         if (nlh == NULL)
3226                 return -EMSGSIZE;
3227
3228         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3229                       ifa->idev->dev->ifindex);
3230
3231         if (!(ifa->flags&IFA_F_PERMANENT)) {
3232                 preferred = ifa->prefered_lft;
3233                 valid = ifa->valid_lft;
3234                 if (preferred != INFINITY_LIFE_TIME) {
3235                         long tval = (jiffies - ifa->tstamp)/HZ;
3236                         preferred -= tval;
3237                         if (valid != INFINITY_LIFE_TIME)
3238                                 valid -= tval;
3239                 }
3240         } else {
3241                 preferred = INFINITY_LIFE_TIME;
3242                 valid = INFINITY_LIFE_TIME;
3243         }
3244
3245         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3246             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3247                 nlmsg_cancel(skb, nlh);
3248                 return -EMSGSIZE;
3249         }
3250
3251         return nlmsg_end(skb, nlh);
3252 }
3253
3254 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3255                                 u32 pid, u32 seq, int event, u16 flags)
3256 {
3257         struct nlmsghdr  *nlh;
3258         u8 scope = RT_SCOPE_UNIVERSE;
3259         int ifindex = ifmca->idev->dev->ifindex;
3260
3261         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3262                 scope = RT_SCOPE_SITE;
3263
3264         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3265         if (nlh == NULL)
3266                 return -EMSGSIZE;
3267
3268         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3269         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3270             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3271                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3272                 nlmsg_cancel(skb, nlh);
3273                 return -EMSGSIZE;
3274         }
3275
3276         return nlmsg_end(skb, nlh);
3277 }
3278
3279 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3280                                 u32 pid, u32 seq, int event, unsigned int flags)
3281 {
3282         struct nlmsghdr  *nlh;
3283         u8 scope = RT_SCOPE_UNIVERSE;
3284         int ifindex = ifaca->aca_idev->dev->ifindex;
3285
3286         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3287                 scope = RT_SCOPE_SITE;
3288
3289         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3290         if (nlh == NULL)
3291                 return -EMSGSIZE;
3292
3293         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3294         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3295             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3296                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3297                 nlmsg_cancel(skb, nlh);
3298                 return -EMSGSIZE;
3299         }
3300
3301         return nlmsg_end(skb, nlh);
3302 }
3303
3304 enum addr_type_t
3305 {
3306         UNICAST_ADDR,
3307         MULTICAST_ADDR,
3308         ANYCAST_ADDR,
3309 };
3310
3311 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3312                            enum addr_type_t type)
3313 {
3314         int idx, ip_idx;
3315         int s_idx, s_ip_idx;
3316         int err = 1;
3317         struct net_device *dev;
3318         struct inet6_dev *idev = NULL;
3319         struct inet6_ifaddr *ifa;
3320         struct ifmcaddr6 *ifmca;
3321         struct ifacaddr6 *ifaca;
3322         struct net *net = skb->sk->sk_net;
3323
3324         s_idx = cb->args[0];
3325         s_ip_idx = ip_idx = cb->args[1];
3326
3327         idx = 0;
3328         for_each_netdev(net, dev) {
3329                 if (idx < s_idx)
3330                         goto cont;
3331                 if (idx > s_idx)
3332                         s_ip_idx = 0;
3333                 ip_idx = 0;
3334                 if ((idev = in6_dev_get(dev)) == NULL)
3335                         goto cont;
3336                 read_lock_bh(&idev->lock);
3337                 switch (type) {
3338                 case UNICAST_ADDR:
3339                         /* unicast address incl. temp addr */
3340                         for (ifa = idev->addr_list; ifa;
3341                              ifa = ifa->if_next, ip_idx++) {
3342                                 if (ip_idx < s_ip_idx)
3343                                         continue;
3344                                 err = inet6_fill_ifaddr(skb, ifa,
3345                                                         NETLINK_CB(cb->skb).pid,
3346                                                         cb->nlh->nlmsg_seq,
3347                                                         RTM_NEWADDR,
3348                                                         NLM_F_MULTI);
3349                         }
3350                         break;
3351                 case MULTICAST_ADDR:
3352                         /* multicast address */
3353                         for (ifmca = idev->mc_list; ifmca;
3354                              ifmca = ifmca->next, ip_idx++) {
3355                                 if (ip_idx < s_ip_idx)
3356                                         continue;
3357                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3358                                                           NETLINK_CB(cb->skb).pid,
3359                                                           cb->nlh->nlmsg_seq,
3360                                                           RTM_GETMULTICAST,
3361                                                           NLM_F_MULTI);
3362                         }
3363                         break;
3364                 case ANYCAST_ADDR:
3365                         /* anycast address */
3366                         for (ifaca = idev->ac_list; ifaca;
3367                              ifaca = ifaca->aca_next, ip_idx++) {
3368                                 if (ip_idx < s_ip_idx)
3369                                         continue;
3370                                 err = inet6_fill_ifacaddr(skb, ifaca,
3371                                                           NETLINK_CB(cb->skb).pid,
3372                                                           cb->nlh->nlmsg_seq,
3373                                                           RTM_GETANYCAST,
3374                                                           NLM_F_MULTI);
3375                         }
3376                         break;
3377                 default:
3378                         break;
3379                 }
3380                 read_unlock_bh(&idev->lock);
3381                 in6_dev_put(idev);
3382
3383                 if (err <= 0)
3384                         break;
3385 cont:
3386                 idx++;
3387         }
3388         cb->args[0] = idx;
3389         cb->args[1] = ip_idx;
3390         return skb->len;
3391 }
3392
3393 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3394 {
3395         enum addr_type_t type = UNICAST_ADDR;
3396
3397         return inet6_dump_addr(skb, cb, type);
3398 }
3399
3400 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3401 {
3402         enum addr_type_t type = MULTICAST_ADDR;
3403
3404         return inet6_dump_addr(skb, cb, type);
3405 }
3406
3407
3408 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3409 {
3410         enum addr_type_t type = ANYCAST_ADDR;
3411
3412         return inet6_dump_addr(skb, cb, type);
3413 }
3414
3415 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3416                              void *arg)
3417 {
3418         struct net *net = in_skb->sk->sk_net;
3419         struct ifaddrmsg *ifm;
3420         struct nlattr *tb[IFA_MAX+1];
3421         struct in6_addr *addr = NULL;
3422         struct net_device *dev = NULL;
3423         struct inet6_ifaddr *ifa;
3424         struct sk_buff *skb;
3425         int err;
3426
3427         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3428         if (err < 0)
3429                 goto errout;
3430
3431         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3432         if (addr == NULL) {
3433                 err = -EINVAL;
3434                 goto errout;
3435         }
3436
3437         ifm = nlmsg_data(nlh);
3438         if (ifm->ifa_index)
3439                 dev = __dev_get_by_index(net, ifm->ifa_index);
3440
3441         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3442                 err = -EADDRNOTAVAIL;
3443                 goto errout;
3444         }
3445
3446         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3447                 err = -ENOBUFS;
3448                 goto errout_ifa;
3449         }
3450
3451         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3452                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3453         if (err < 0) {
3454                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3455                 WARN_ON(err == -EMSGSIZE);
3456                 kfree_skb(skb);
3457                 goto errout_ifa;
3458         }
3459         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3460 errout_ifa:
3461         in6_ifa_put(ifa);
3462 errout:
3463         return err;
3464 }
3465
3466 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3467 {
3468         struct sk_buff *skb;
3469         struct net *net = ifa->idev->dev->nd_net;
3470         int err = -ENOBUFS;
3471
3472         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3473         if (skb == NULL)
3474                 goto errout;
3475
3476         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3477         if (err < 0) {
3478                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3479                 WARN_ON(err == -EMSGSIZE);
3480                 kfree_skb(skb);
3481                 goto errout;
3482         }
3483         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3484 errout:
3485         if (err < 0)
3486                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3487 }
3488
3489 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3490                                 __s32 *array, int bytes)
3491 {
3492         BUG_ON(bytes < (DEVCONF_MAX * 4));
3493
3494         memset(array, 0, bytes);
3495         array[DEVCONF_FORWARDING] = cnf->forwarding;
3496         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3497         array[DEVCONF_MTU6] = cnf->mtu6;
3498         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3499         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3500         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3501         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3502         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3503         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3504         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3505         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3506 #ifdef CONFIG_IPV6_PRIVACY
3507         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3508         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3509         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3510         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3511         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3512 #endif
3513         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3514         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3515         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3516 #ifdef CONFIG_IPV6_ROUTER_PREF
3517         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3518         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3519 #ifdef CONFIG_IPV6_ROUTE_INFO
3520         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3521 #endif
3522 #endif
3523         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3524         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3525 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3526         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3527 #endif
3528 }
3529
3530 static inline size_t inet6_if_nlmsg_size(void)
3531 {
3532         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3533                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3534                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3535                + nla_total_size(4) /* IFLA_MTU */
3536                + nla_total_size(4) /* IFLA_LINK */
3537                + nla_total_size( /* IFLA_PROTINFO */
3538                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3539                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3540                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3541                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3542                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3543                  );
3544 }
3545
3546 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3547                                       int bytes)
3548 {
3549         int i;
3550         int pad = bytes - sizeof(u64) * items;
3551         BUG_ON(pad < 0);
3552
3553         /* Use put_unaligned() because stats may not be aligned for u64. */
3554         put_unaligned(items, &stats[0]);
3555         for (i = 1; i < items; i++)
3556                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3557
3558         memset(&stats[items], 0, pad);
3559 }
3560
3561 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3562                              int bytes)
3563 {
3564         switch(attrtype) {
3565         case IFLA_INET6_STATS:
3566                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3567                 break;
3568         case IFLA_INET6_ICMP6STATS:
3569                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3570                 break;
3571         }
3572 }
3573
3574 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3575                              u32 pid, u32 seq, int event, unsigned int flags)
3576 {
3577         struct net_device *dev = idev->dev;
3578         struct nlattr *nla;
3579         struct ifinfomsg *hdr;
3580         struct nlmsghdr *nlh;
3581         void *protoinfo;
3582         struct ifla_cacheinfo ci;
3583
3584         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3585         if (nlh == NULL)
3586                 return -EMSGSIZE;
3587
3588         hdr = nlmsg_data(nlh);
3589         hdr->ifi_family = AF_INET6;
3590         hdr->__ifi_pad = 0;
3591         hdr->ifi_type = dev->type;
3592         hdr->ifi_index = dev->ifindex;
3593         hdr->ifi_flags = dev_get_flags(dev);
3594         hdr->ifi_change = 0;
3595
3596         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3597
3598         if (dev->addr_len)
3599                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3600
3601         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3602         if (dev->ifindex != dev->iflink)
3603                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3604
3605         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3606         if (protoinfo == NULL)
3607                 goto nla_put_failure;
3608
3609         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3610
3611         ci.max_reasm_len = IPV6_MAXPLEN;
3612         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3613                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3614         ci.reachable_time = idev->nd_parms->reachable_time;
3615         ci.retrans_time = idev->nd_parms->retrans_time;
3616         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3617
3618         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3619         if (nla == NULL)
3620                 goto nla_put_failure;
3621         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3622
3623         /* XXX - MC not implemented */
3624
3625         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3626         if (nla == NULL)
3627                 goto nla_put_failure;
3628         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3629
3630         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3631         if (nla == NULL)
3632                 goto nla_put_failure;
3633         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3634
3635         nla_nest_end(skb, protoinfo);
3636         return nlmsg_end(skb, nlh);
3637
3638 nla_put_failure:
3639         nlmsg_cancel(skb, nlh);
3640         return -EMSGSIZE;
3641 }
3642
3643 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3644 {
3645         struct net *net = skb->sk->sk_net;
3646         int idx, err;
3647         int s_idx = cb->args[0];
3648         struct net_device *dev;
3649         struct inet6_dev *idev;
3650
3651         read_lock(&dev_base_lock);
3652         idx = 0;
3653         for_each_netdev(net, dev) {
3654                 if (idx < s_idx)
3655                         goto cont;
3656                 if ((idev = in6_dev_get(dev)) == NULL)
3657                         goto cont;
3658                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3659                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3660                 in6_dev_put(idev);
3661                 if (err <= 0)
3662                         break;
3663 cont:
3664                 idx++;
3665         }
3666         read_unlock(&dev_base_lock);
3667         cb->args[0] = idx;
3668
3669         return skb->len;
3670 }
3671
3672 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3673 {
3674         struct sk_buff *skb;
3675         struct net *net = idev->dev->nd_net;
3676         int err = -ENOBUFS;
3677
3678         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3679         if (skb == NULL)
3680                 goto errout;
3681
3682         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3683         if (err < 0) {
3684                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3685                 WARN_ON(err == -EMSGSIZE);
3686                 kfree_skb(skb);
3687                 goto errout;
3688         }
3689         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3690 errout:
3691         if (err < 0)
3692                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3693 }
3694
3695 static inline size_t inet6_prefix_nlmsg_size(void)
3696 {
3697         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3698                + nla_total_size(sizeof(struct in6_addr))
3699                + nla_total_size(sizeof(struct prefix_cacheinfo));
3700 }
3701
3702 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3703                              struct prefix_info *pinfo, u32 pid, u32 seq,
3704                              int event, unsigned int flags)
3705 {
3706         struct prefixmsg *pmsg;
3707         struct nlmsghdr *nlh;
3708         struct prefix_cacheinfo ci;
3709
3710         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3711         if (nlh == NULL)
3712                 return -EMSGSIZE;
3713
3714         pmsg = nlmsg_data(nlh);
3715         pmsg->prefix_family = AF_INET6;
3716         pmsg->prefix_pad1 = 0;
3717         pmsg->prefix_pad2 = 0;
3718         pmsg->prefix_ifindex = idev->dev->ifindex;
3719         pmsg->prefix_len = pinfo->prefix_len;
3720         pmsg->prefix_type = pinfo->type;
3721         pmsg->prefix_pad3 = 0;
3722         pmsg->prefix_flags = 0;
3723         if (pinfo->onlink)
3724                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3725         if (pinfo->autoconf)
3726                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3727
3728         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3729
3730         ci.preferred_time = ntohl(pinfo->prefered);
3731         ci.valid_time = ntohl(pinfo->valid);
3732         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3733
3734         return nlmsg_end(skb, nlh);
3735
3736 nla_put_failure:
3737         nlmsg_cancel(skb, nlh);
3738         return -EMSGSIZE;
3739 }
3740
3741 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3742                          struct prefix_info *pinfo)
3743 {
3744         struct sk_buff *skb;
3745         struct net *net = idev->dev->nd_net;
3746         int err = -ENOBUFS;
3747
3748         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3749         if (skb == NULL)
3750                 goto errout;
3751
3752         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3753         if (err < 0) {
3754                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3755                 WARN_ON(err == -EMSGSIZE);
3756                 kfree_skb(skb);
3757                 goto errout;
3758         }
3759         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3760 errout:
3761         if (err < 0)
3762                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3763 }
3764
3765 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3766 {
3767         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3768
3769         switch (event) {
3770         case RTM_NEWADDR:
3771                 /*
3772                  * If the address was optimistic
3773                  * we inserted the route at the start of
3774                  * our DAD process, so we don't need
3775                  * to do it again
3776                  */
3777                 if (!(ifp->rt->rt6i_node))
3778                         ip6_ins_rt(ifp->rt);
3779                 if (ifp->idev->cnf.forwarding)
3780                         addrconf_join_anycast(ifp);
3781                 break;
3782         case RTM_DELADDR:
3783                 if (ifp->idev->cnf.forwarding)
3784                         addrconf_leave_anycast(ifp);
3785                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3786                 dst_hold(&ifp->rt->u.dst);
3787                 if (ip6_del_rt(ifp->rt))
3788                         dst_free(&ifp->rt->u.dst);
3789                 break;
3790         }
3791 }
3792
3793 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3794 {
3795         rcu_read_lock_bh();
3796         if (likely(ifp->idev->dead == 0))
3797                 __ipv6_ifa_notify(event, ifp);
3798         rcu_read_unlock_bh();
3799 }
3800
3801 #ifdef CONFIG_SYSCTL
3802
3803 static
3804 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3805                            void __user *buffer, size_t *lenp, loff_t *ppos)
3806 {
3807         int *valp = ctl->data;
3808         int val = *valp;
3809         int ret;
3810
3811         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3812
3813         if (write)
3814                 addrconf_fixup_forwarding(ctl, valp, val);
3815         return ret;
3816 }
3817
3818 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3819                                             int __user *name, int nlen,
3820                                             void __user *oldval,
3821                                             size_t __user *oldlenp,
3822                                             void __user *newval, size_t newlen)
3823 {
3824         int *valp = table->data;
3825         int val = *valp;
3826         int new;
3827
3828         if (!newval || !newlen)
3829                 return 0;
3830         if (newlen != sizeof(int))
3831                 return -EINVAL;
3832         if (get_user(new, (int __user *)newval))
3833                 return -EFAULT;
3834         if (new == *valp)
3835                 return 0;
3836         if (oldval && oldlenp) {
3837                 size_t len;
3838                 if (get_user(len, oldlenp))
3839                         return -EFAULT;
3840                 if (len) {
3841                         if (len > table->maxlen)
3842                                 len = table->maxlen;
3843                         if (copy_to_user(oldval, valp, len))
3844                                 return -EFAULT;
3845                         if (put_user(len, oldlenp))
3846                                 return -EFAULT;
3847                 }
3848         }
3849
3850         *valp = new;
3851         addrconf_fixup_forwarding(table, valp, val);
3852         return 1;
3853 }
3854
3855 static struct addrconf_sysctl_table
3856 {
3857         struct ctl_table_header *sysctl_header;
3858         ctl_table addrconf_vars[__NET_IPV6_MAX];
3859         char *dev_name;
3860 } addrconf_sysctl __read_mostly = {
3861         .sysctl_header = NULL,
3862         .addrconf_vars = {
3863                 {
3864                         .ctl_name       =       NET_IPV6_FORWARDING,
3865                         .procname       =       "forwarding",
3866                         .data           =       &ipv6_devconf.forwarding,
3867                         .maxlen         =       sizeof(int),
3868                         .mode           =       0644,
3869                         .proc_handler   =       &addrconf_sysctl_forward,
3870                         .strategy       =       &addrconf_sysctl_forward_strategy,
3871                 },
3872                 {
3873                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3874                         .procname       =       "hop_limit",
3875                         .data           =       &ipv6_devconf.hop_limit,
3876                         .maxlen         =       sizeof(int),
3877                         .mode           =       0644,
3878                         .proc_handler   =       proc_dointvec,
3879                 },
3880                 {
3881                         .ctl_name       =       NET_IPV6_MTU,
3882                         .procname       =       "mtu",
3883                         .data           =       &ipv6_devconf.mtu6,
3884                         .maxlen         =       sizeof(int),
3885                         .mode           =       0644,
3886                         .proc_handler   =       &proc_dointvec,
3887                 },
3888                 {
3889                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3890                         .procname       =       "accept_ra",
3891                         .data           =       &ipv6_devconf.accept_ra,
3892                         .maxlen         =       sizeof(int),
3893                         .mode           =       0644,
3894                         .proc_handler   =       &proc_dointvec,
3895                 },
3896                 {
3897                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3898                         .procname       =       "accept_redirects",
3899                         .data           =       &ipv6_devconf.accept_redirects,
3900                         .maxlen         =       sizeof(int),
3901                         .mode           =       0644,
3902                         .proc_handler   =       &proc_dointvec,
3903                 },
3904                 {
3905                         .ctl_name       =       NET_IPV6_AUTOCONF,
3906                         .procname       =       "autoconf",
3907                         .data           =       &ipv6_devconf.autoconf,
3908                         .maxlen         =       sizeof(int),
3909                         .mode           =       0644,
3910                         .proc_handler   =       &proc_dointvec,
3911                 },
3912                 {
3913                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3914                         .procname       =       "dad_transmits",
3915                         .data           =       &ipv6_devconf.dad_transmits,
3916                         .maxlen         =       sizeof(int),
3917                         .mode           =       0644,
3918                         .proc_handler   =       &proc_dointvec,
3919                 },
3920                 {
3921                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3922                         .procname       =       "router_solicitations",
3923                         .data           =       &ipv6_devconf.rtr_solicits,
3924                         .maxlen         =       sizeof(int),
3925                         .mode           =       0644,
3926                         .proc_handler   =       &proc_dointvec,
3927                 },
3928                 {
3929                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3930                         .procname       =       "router_solicitation_interval",
3931                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3932                         .maxlen         =       sizeof(int),
3933                         .mode           =       0644,
3934                         .proc_handler   =       &proc_dointvec_jiffies,
3935                         .strategy       =       &sysctl_jiffies,
3936                 },
3937                 {
3938                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3939                         .procname       =       "router_solicitation_delay",
3940                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3941                         .maxlen         =       sizeof(int),
3942                         .mode           =       0644,
3943                         .proc_handler   =       &proc_dointvec_jiffies,
3944                         .strategy       =       &sysctl_jiffies,
3945                 },
3946                 {
3947                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3948                         .procname       =       "force_mld_version",
3949                         .data           =       &ipv6_devconf.force_mld_version,
3950                         .maxlen         =       sizeof(int),
3951                         .mode           =       0644,
3952                         .proc_handler   =       &proc_dointvec,
3953                 },
3954 #ifdef CONFIG_IPV6_PRIVACY
3955                 {
3956                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3957                         .procname       =       "use_tempaddr",
3958                         .data           =       &ipv6_devconf.use_tempaddr,
3959                         .maxlen         =       sizeof(int),
3960                         .mode           =       0644,
3961                         .proc_handler   =       &proc_dointvec,
3962                 },
3963                 {
3964                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3965                         .procname       =       "temp_valid_lft",
3966                         .data           =       &ipv6_devconf.temp_valid_lft,
3967                         .maxlen         =       sizeof(int),
3968                         .mode           =       0644,
3969                         .proc_handler   =       &proc_dointvec,
3970                 },
3971                 {
3972                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3973                         .procname       =       "temp_prefered_lft",
3974                         .data           =       &ipv6_devconf.temp_prefered_lft,
3975                         .maxlen         =       sizeof(int),
3976                         .mode           =       0644,
3977                         .proc_handler   =       &proc_dointvec,
3978                 },
3979                 {
3980                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3981                         .procname       =       "regen_max_retry",
3982                         .data           =       &ipv6_devconf.regen_max_retry,
3983                         .maxlen         =       sizeof(int),
3984                         .mode           =       0644,
3985                         .proc_handler   =       &proc_dointvec,
3986                 },
3987                 {
3988                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3989                         .procname       =       "max_desync_factor",
3990                         .data           =       &ipv6_devconf.max_desync_factor,
3991                         .maxlen         =       sizeof(int),
3992                         .mode           =       0644,
3993                         .proc_handler   =       &proc_dointvec,
3994                 },
3995 #endif
3996                 {
3997                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3998                         .procname       =       "max_addresses",
3999                         .data           =       &ipv6_devconf.max_addresses,
4000                         .maxlen         =       sizeof(int),
4001                         .mode           =       0644,
4002                         .proc_handler   =       &proc_dointvec,
4003                 },
4004                 {
4005                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4006                         .procname       =       "accept_ra_defrtr",
4007                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4008                         .maxlen         =       sizeof(int),
4009                         .mode           =       0644,
4010                         .proc_handler   =       &proc_dointvec,
4011                 },
4012                 {
4013                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4014                         .procname       =       "accept_ra_pinfo",
4015                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4016                         .maxlen         =       sizeof(int),
4017                         .mode           =       0644,
4018                         .proc_handler   =       &proc_dointvec,
4019                 },
4020 #ifdef CONFIG_IPV6_ROUTER_PREF
4021                 {
4022                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4023                         .procname       =       "accept_ra_rtr_pref",
4024                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4025                         .maxlen         =       sizeof(int),
4026                         .mode           =       0644,
4027                         .proc_handler   =       &proc_dointvec,
4028                 },
4029                 {
4030                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4031                         .procname       =       "router_probe_interval",
4032                         .data           =       &ipv6_devconf.rtr_probe_interval,
4033                         .maxlen         =       sizeof(int),
4034                         .mode           =       0644,
4035                         .proc_handler   =       &proc_dointvec_jiffies,
4036                         .strategy       =       &sysctl_jiffies,
4037                 },
4038 #ifdef CONFIG_IPV6_ROUTE_INFO
4039                 {
4040                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4041                         .procname       =       "accept_ra_rt_info_max_plen",
4042                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4043                         .maxlen         =       sizeof(int),
4044                         .mode           =       0644,
4045                         .proc_handler   =       &proc_dointvec,
4046                 },
4047 #endif
4048 #endif
4049                 {
4050                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4051                         .procname       =       "proxy_ndp",
4052                         .data           =       &ipv6_devconf.proxy_ndp,
4053                         .maxlen         =       sizeof(int),
4054                         .mode           =       0644,
4055                         .proc_handler   =       &proc_dointvec,
4056                 },
4057                 {
4058                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4059                         .procname       =       "accept_source_route",
4060                         .data           =       &ipv6_devconf.accept_source_route,
4061                         .maxlen         =       sizeof(int),
4062                         .mode           =       0644,
4063                         .proc_handler   =       &proc_dointvec,
4064                 },
4065 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4066                 {
4067                         .ctl_name       =       CTL_UNNUMBERED,
4068                         .procname       =       "optimistic_dad",
4069                         .data           =       &ipv6_devconf.optimistic_dad,
4070                         .maxlen         =       sizeof(int),
4071                         .mode           =       0644,
4072                         .proc_handler   =       &proc_dointvec,
4073
4074                 },
4075 #endif
4076                 {
4077                         .ctl_name       =       0,      /* sentinel */
4078                 }
4079         },
4080 };
4081
4082 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4083                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4084 {
4085         int i;
4086         struct addrconf_sysctl_table *t;
4087
4088 #define ADDRCONF_CTL_PATH_DEV   3
4089
4090         struct ctl_path addrconf_ctl_path[] = {
4091                 { .procname = "net", .ctl_name = CTL_NET, },
4092                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4093                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4094                 { /* to be set */ },
4095                 { },
4096         };
4097
4098
4099         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4100         if (t == NULL)
4101                 goto out;
4102
4103         for (i=0; t->addrconf_vars[i].data; i++) {
4104                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4105                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4106                 t->addrconf_vars[i].extra2 = net;
4107         }
4108
4109         /*
4110          * Make a copy of dev_name, because '.procname' is regarded as const
4111          * by sysctl and we wouldn't want anyone to change it under our feet
4112          * (see SIOCSIFNAME).
4113          */
4114         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4115         if (!t->dev_name)
4116                 goto free;
4117
4118         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4119         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4120
4121         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4122                         t->addrconf_vars);
4123         if (t->sysctl_header == NULL)
4124                 goto free_procname;
4125
4126         p->sysctl = t;
4127         return 0;
4128
4129 free_procname:
4130         kfree(t->dev_name);
4131 free:
4132         kfree(t);
4133 out:
4134         return -ENOBUFS;
4135 }
4136
4137 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4138 {
4139         struct addrconf_sysctl_table *t;
4140
4141         if (p->sysctl == NULL)
4142                 return;
4143
4144         t = p->sysctl;
4145         p->sysctl = NULL;
4146         unregister_sysctl_table(t->sysctl_header);
4147         kfree(t->dev_name);
4148         kfree(t);
4149 }
4150
4151 static void addrconf_sysctl_register(struct inet6_dev *idev)
4152 {
4153         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4154                               NET_IPV6_NEIGH, "ipv6",
4155                               &ndisc_ifinfo_sysctl_change,
4156                               NULL);
4157         __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4158                         idev->dev->ifindex, idev, &idev->cnf);
4159 }
4160
4161 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4162 {
4163         __addrconf_sysctl_unregister(&idev->cnf);
4164         neigh_sysctl_unregister(idev->nd_parms);
4165 }
4166
4167
4168 #endif
4169
4170 static int addrconf_init_net(struct net *net)
4171 {
4172         int err;
4173         struct ipv6_devconf *all, *dflt;
4174
4175         err = -ENOMEM;
4176         all = &ipv6_devconf;
4177         dflt = &ipv6_devconf_dflt;
4178
4179         if (net != &init_net) {
4180                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4181                 if (all == NULL)
4182                         goto err_alloc_all;
4183
4184                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4185                 if (dflt == NULL)
4186                         goto err_alloc_dflt;
4187         }
4188
4189         net->ipv6.devconf_all = all;
4190         net->ipv6.devconf_dflt = dflt;
4191
4192 #ifdef CONFIG_SYSCTL
4193         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4194                         NULL, all);
4195         if (err < 0)
4196                 goto err_reg_all;
4197
4198         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4199                         NULL, dflt);
4200         if (err < 0)
4201                 goto err_reg_dflt;
4202 #endif
4203         return 0;
4204
4205 #ifdef CONFIG_SYSCTL
4206 err_reg_dflt:
4207         __addrconf_sysctl_unregister(all);
4208 err_reg_all:
4209         kfree(dflt);
4210 #endif
4211 err_alloc_dflt:
4212         kfree(all);
4213 err_alloc_all:
4214         return err;
4215 }
4216
4217 static void addrconf_exit_net(struct net *net)
4218 {
4219 #ifdef CONFIG_SYSCTL
4220         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4221         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4222 #endif
4223         if (net != &init_net) {
4224                 kfree(net->ipv6.devconf_dflt);
4225                 kfree(net->ipv6.devconf_all);
4226         }
4227 }
4228
4229 static struct pernet_operations addrconf_ops = {
4230         .init = addrconf_init_net,
4231         .exit = addrconf_exit_net,
4232 };
4233
4234 /*
4235  *      Device notifier
4236  */
4237
4238 int register_inet6addr_notifier(struct notifier_block *nb)
4239 {
4240         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4241 }
4242
4243 EXPORT_SYMBOL(register_inet6addr_notifier);
4244
4245 int unregister_inet6addr_notifier(struct notifier_block *nb)
4246 {
4247         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4248 }
4249
4250 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4251
4252
4253 static int addrconf_net_init(struct net *net)
4254 {
4255         return 0;
4256 }
4257
4258 static void addrconf_net_exit(struct net *net)
4259 {
4260         struct net_device *dev;
4261
4262         rtnl_lock();
4263         /* clean dev list */
4264         for_each_netdev(net, dev) {
4265                 if (__in6_dev_get(dev) == NULL)
4266                         continue;
4267                 addrconf_ifdown(dev, 1);
4268         }
4269         addrconf_ifdown(net->loopback_dev, 2);
4270         rtnl_unlock();
4271 }
4272
4273 static struct pernet_operations addrconf_net_ops = {
4274         .init = addrconf_net_init,
4275         .exit = addrconf_net_exit,
4276 };
4277
4278 /*
4279  *      Init / cleanup code
4280  */
4281
4282 int __init addrconf_init(void)
4283 {
4284         int err;
4285
4286         if ((err = ipv6_addr_label_init()) < 0) {
4287                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4288                         err);
4289                 return err;
4290         }
4291
4292         register_pernet_subsys(&addrconf_ops);
4293
4294         /* The addrconf netdev notifier requires that loopback_dev
4295          * has it's ipv6 private information allocated and setup
4296          * before it can bring up and give link-local addresses
4297          * to other devices which are up.
4298          *
4299          * Unfortunately, loopback_dev is not necessarily the first
4300          * entry in the global dev_base list of net devices.  In fact,
4301          * it is likely to be the very last entry on that list.
4302          * So this causes the notifier registry below to try and
4303          * give link-local addresses to all devices besides loopback_dev
4304          * first, then loopback_dev, which cases all the non-loopback_dev
4305          * devices to fail to get a link-local address.
4306          *
4307          * So, as a temporary fix, allocate the ipv6 structure for
4308          * loopback_dev first by hand.
4309          * Longer term, all of the dependencies ipv6 has upon the loopback
4310          * device and it being up should be removed.
4311          */
4312         rtnl_lock();
4313         if (!ipv6_add_dev(init_net.loopback_dev))
4314                 err = -ENOMEM;
4315         rtnl_unlock();
4316         if (err)
4317                 goto errlo;
4318
4319         err = register_pernet_device(&addrconf_net_ops);
4320         if (err)
4321                 return err;
4322
4323         register_netdevice_notifier(&ipv6_dev_notf);
4324
4325         addrconf_verify(0);
4326
4327         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4328         if (err < 0)
4329                 goto errout;
4330
4331         /* Only the first call to __rtnl_register can fail */
4332         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4333         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4334         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4335         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4336         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4337
4338         ipv6_addr_label_rtnl_register();
4339
4340         return 0;
4341 errout:
4342         unregister_netdevice_notifier(&ipv6_dev_notf);
4343 errlo:
4344         unregister_pernet_subsys(&addrconf_ops);
4345
4346         return err;
4347 }
4348
4349 void addrconf_cleanup(void)
4350 {
4351         struct inet6_ifaddr *ifa;
4352         int i;
4353
4354         unregister_netdevice_notifier(&ipv6_dev_notf);
4355         unregister_pernet_device(&addrconf_net_ops);
4356
4357         unregister_pernet_subsys(&addrconf_ops);
4358
4359         rtnl_lock();
4360
4361         /*
4362          *      Check hash table.
4363          */
4364         write_lock_bh(&addrconf_hash_lock);
4365         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4366                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4367                         struct inet6_ifaddr *bifa;
4368
4369                         bifa = ifa;
4370                         ifa = ifa->lst_next;
4371                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4372                         /* Do not free it; something is wrong.
4373                            Now we can investigate it with debugger.
4374                          */
4375                 }
4376         }
4377         write_unlock_bh(&addrconf_hash_lock);
4378
4379         del_timer(&addr_chk_timer);
4380         rtnl_unlock();
4381
4382         unregister_pernet_subsys(&addrconf_net_ops);
4383 }