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   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <asm/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90
  91 /* Set to 3 to get tracing... */
  92 #define ACONF_DEBUG 2
  93
  94 #if ACONF_DEBUG >= 3
  95 #define ADBG(x) printk x
  96 #else
  97 #define ADBG(x)
  98 #endif
  99
 100 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 102
 103 #ifdef CONFIG_SYSCTL
 104 static void addrconf_sysctl_register(struct inet6_dev *idev);
 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_net(dev)->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 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(dev_net(idev->dev), 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 = dev_net(ifp->idev->dev);
 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         unsigned long regen_advance;
 780         int tmp_plen;
 781         int ret = 0;
 782         int max_addresses;
 783         u32 addr_flags;
 784
 785         write_lock(&idev->lock);
 786         if (ift) {
 787                 spin_lock_bh(&ift->lock);
 788                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 789                 spin_unlock_bh(&ift->lock);
 790                 tmpaddr = &addr;
 791         } else {
 792                 tmpaddr = NULL;
 793         }
 794 retry:
 795         in6_dev_hold(idev);
 796         if (idev->cnf.use_tempaddr <= 0) {
 797                 write_unlock(&idev->lock);
 798                 printk(KERN_INFO
 799                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 800                 in6_dev_put(idev);
 801                 ret = -1;
 802                 goto out;
 803         }
 804         spin_lock_bh(&ifp->lock);
 805         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 806                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 807                 spin_unlock_bh(&ifp->lock);
 808                 write_unlock(&idev->lock);
 809                 printk(KERN_WARNING
 810                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 811                 in6_dev_put(idev);
 812                 ret = -1;
 813                 goto out;
 814         }
 815         in6_ifa_hold(ifp);
 816         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 817         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 818                 spin_unlock_bh(&ifp->lock);
 819                 write_unlock(&idev->lock);
 820                 printk(KERN_WARNING
 821                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 822                 in6_ifa_put(ifp);
 823                 in6_dev_put(idev);
 824                 ret = -1;
 825                 goto out;
 826         }
 827         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 828         tmp_valid_lft = min_t(__u32,
 829                               ifp->valid_lft,
 830                               idev->cnf.temp_valid_lft);
 831         tmp_prefered_lft = min_t(__u32,
 832                                  ifp->prefered_lft,
 833                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 834         tmp_plen = ifp->prefix_len;
 835         max_addresses = idev->cnf.max_addresses;
 836         tmp_cstamp = ifp->cstamp;
 837         tmp_tstamp = ifp->tstamp;
 838         spin_unlock_bh(&ifp->lock);
 839
 840         regen_advance = idev->cnf.regen_max_retry *
 841                         idev->cnf.dad_transmits *
 842                         idev->nd_parms->retrans_time / HZ;
 843         write_unlock(&idev->lock);
 844
 845         /* A temporary address is created only if this calculated Preferred
 846          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 847          * an implementation must not create a temporary address with a zero
 848          * Preferred Lifetime.
 849          */
 850         if (tmp_prefered_lft <= regen_advance) {
 851                 in6_ifa_put(ifp);
 852                 in6_dev_put(idev);
 853                 ret = -1;
 854                 goto out;
 855         }
 856
 857         addr_flags = IFA_F_TEMPORARY;
 858         /* set in addrconf_prefix_rcv() */
 859         if (ifp->flags & IFA_F_OPTIMISTIC)
 860                 addr_flags |= IFA_F_OPTIMISTIC;
 861
 862         ift = !max_addresses ||
 863               ipv6_count_addresses(idev) < max_addresses ?
 864                 ipv6_add_addr(idev, &addr, tmp_plen,
 865                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 866                               addr_flags) : NULL;
 867         if (!ift || IS_ERR(ift)) {
 868                 in6_ifa_put(ifp);
 869                 in6_dev_put(idev);
 870                 printk(KERN_INFO
 871                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 872                 tmpaddr = &addr;
 873                 write_lock(&idev->lock);
 874                 goto retry;
 875         }
 876
 877         spin_lock_bh(&ift->lock);
 878         ift->ifpub = ifp;
 879         ift->valid_lft = tmp_valid_lft;
 880         ift->prefered_lft = tmp_prefered_lft;
 881         ift->cstamp = tmp_cstamp;
 882         ift->tstamp = tmp_tstamp;
 883         spin_unlock_bh(&ift->lock);
 884
 885         addrconf_dad_start(ift, 0);
 886         in6_ifa_put(ift);
 887         in6_dev_put(idev);
 888 out:
 889         return ret;
 890 }
 891 #endif
 892
 893 /*
 894  *      Choose an appropriate source address (RFC3484)
 895  */
 896 enum {
 897         IPV6_SADDR_RULE_INIT = 0,
 898         IPV6_SADDR_RULE_LOCAL,
 899         IPV6_SADDR_RULE_SCOPE,
 900         IPV6_SADDR_RULE_PREFERRED,
 901 #ifdef CONFIG_IPV6_MIP6
 902         IPV6_SADDR_RULE_HOA,
 903 #endif
 904         IPV6_SADDR_RULE_OIF,
 905         IPV6_SADDR_RULE_LABEL,
 906 #ifdef CONFIG_IPV6_PRIVACY
 907         IPV6_SADDR_RULE_PRIVACY,
 908 #endif
 909         IPV6_SADDR_RULE_ORCHID,
 910         IPV6_SADDR_RULE_PREFIX,
 911         IPV6_SADDR_RULE_MAX
 912 };
 913
 914 struct ipv6_saddr_score {
 915         int                     rule;
 916         int                     addr_type;
 917         struct inet6_ifaddr     *ifa;
 918         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 919         int                     scopedist;
 920         int                     matchlen;
 921 };
 922
 923 struct ipv6_saddr_dst {
 924         struct in6_addr *addr;
 925         int ifindex;
 926         int scope;
 927         int label;
 928         unsigned int prefs;
 929 };
 930
 931 static inline int ipv6_saddr_preferred(int type)
 932 {
 933         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 934                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 935                 return 1;
 936         return 0;
 937 }
 938
 939 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
 940                                struct ipv6_saddr_dst *dst,
 941                                int i)
 942 {
 943         int ret;
 944
 945         if (i <= score->rule) {
 946                 switch (i) {
 947                 case IPV6_SADDR_RULE_SCOPE:
 948                         ret = score->scopedist;
 949                         break;
 950                 case IPV6_SADDR_RULE_PREFIX:
 951                         ret = score->matchlen;
 952                         break;
 953                 default:
 954                         ret = !!test_bit(i, score->scorebits);
 955                 }
 956                 goto out;
 957         }
 958
 959         switch (i) {
 960         case IPV6_SADDR_RULE_INIT:
 961                 /* Rule 0: remember if hiscore is not ready yet */
 962                 ret = !!score->ifa;
 963                 break;
 964         case IPV6_SADDR_RULE_LOCAL:
 965                 /* Rule 1: Prefer same address */
 966                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
 967                 break;
 968         case IPV6_SADDR_RULE_SCOPE:
 969                 /* Rule 2: Prefer appropriate scope
 970                  *
 971                  *      ret
 972                  *       ^
 973                  *    -1 |  d 15
 974                  *    ---+--+-+---> scope
 975                  *       |
 976                  *       |             d is scope of the destination.
 977                  *  B-d  |  \
 978                  *       |   \      <- smaller scope is better if
 979                  *  B-15 |    \        if scope is enough for destinaion.
 980                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
 981                  * d-C-1 | /
 982                  *       |/         <- greater is better
 983                  *   -C  /             if scope is not enough for destination.
 984                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
 985                  *
 986                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
 987                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
 988                  * Assume B = 0 and we get C > 29.
 989                  */
 990                 ret = __ipv6_addr_src_scope(score->addr_type);
 991                 if (ret >= dst->scope)
 992                         ret = -ret;
 993                 else
 994                         ret -= 128;     /* 30 is enough */
 995                 score->scopedist = ret;
 996                 break;
 997         case IPV6_SADDR_RULE_PREFERRED:
 998                 /* Rule 3: Avoid deprecated and optimistic addresses */
 999                 ret = ipv6_saddr_preferred(score->addr_type) ||
1000                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1001                 break;
1002 #ifdef CONFIG_IPV6_MIP6
1003         case IPV6_SADDR_RULE_HOA:
1004             {
1005                 /* Rule 4: Prefer home address */
1006                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1007                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1008                 break;
1009             }
1010 #endif
1011         case IPV6_SADDR_RULE_OIF:
1012                 /* Rule 5: Prefer outgoing interface */
1013                 ret = (!dst->ifindex ||
1014                        dst->ifindex == score->ifa->idev->dev->ifindex);
1015                 break;
1016         case IPV6_SADDR_RULE_LABEL:
1017                 /* Rule 6: Prefer matching label */
1018                 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1019                                       score->ifa->idev->dev->ifindex) == dst->label;
1020                 break;
1021 #ifdef CONFIG_IPV6_PRIVACY
1022         case IPV6_SADDR_RULE_PRIVACY:
1023             {
1024                 /* Rule 7: Prefer public address
1025                  * Note: prefer temprary address if use_tempaddr >= 2
1026                  */
1027                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1028                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1029                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1030                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1031                 break;
1032             }
1033 #endif
1034         case IPV6_SADDR_RULE_ORCHID:
1035                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1036                  *          non-ORCHID vs non-ORCHID
1037                  */
1038                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1039                         ipv6_addr_orchid(dst->addr));
1040                 break;
1041         case IPV6_SADDR_RULE_PREFIX:
1042                 /* Rule 8: Use longest matching prefix */
1043                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1044                                                        dst->addr);
1045                 break;
1046         default:
1047                 ret = 0;
1048         }
1049
1050         if (ret)
1051                 __set_bit(i, score->scorebits);
1052         score->rule = i;
1053 out:
1054         return ret;
1055 }
1056
1057 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1058                        struct in6_addr *daddr, unsigned int prefs,
1059                        struct in6_addr *saddr)
1060 {
1061         struct ipv6_saddr_score scores[2],
1062                                 *score = &scores[0], *hiscore = &scores[1];
1063         struct net *net = dev_net(dst_dev);
1064         struct ipv6_saddr_dst dst;
1065         struct net_device *dev;
1066         int dst_type;
1067
1068         dst_type = __ipv6_addr_type(daddr);
1069         dst.addr = daddr;
1070         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1071         dst.scope = __ipv6_addr_src_scope(dst_type);
1072         dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1073         dst.prefs = prefs;
1074
1075         hiscore->rule = -1;
1076         hiscore->ifa = NULL;
1077
1078         read_lock(&dev_base_lock);
1079         rcu_read_lock();
1080
1081         for_each_netdev(net, dev) {
1082                 struct inet6_dev *idev;
1083
1084                 /* Candidate Source Address (section 4)
1085                  *  - multicast and link-local destination address,
1086                  *    the set of candidate source address MUST only
1087                  *    include addresses assigned to interfaces
1088                  *    belonging to the same link as the outgoing
1089                  *    interface.
1090                  * (- For site-local destination addresses, the
1091                  *    set of candidate source addresses MUST only
1092                  *    include addresses assigned to interfaces
1093                  *    belonging to the same site as the outgoing
1094                  *    interface.)
1095                  */
1096                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1097                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1098                     dst.ifindex && dev->ifindex != dst.ifindex)
1099                         continue;
1100
1101                 idev = __in6_dev_get(dev);
1102                 if (!idev)
1103                         continue;
1104
1105                 read_lock_bh(&idev->lock);
1106                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1107                         int i;
1108
1109                         /*
1110                          * - Tentative Address (RFC2462 section 5.4)
1111                          *  - A tentative address is not considered
1112                          *    "assigned to an interface" in the traditional
1113                          *    sense, unless it is also flagged as optimistic.
1114                          * - Candidate Source Address (section 4)
1115                          *  - In any case, anycast addresses, multicast
1116                          *    addresses, and the unspecified address MUST
1117                          *    NOT be included in a candidate set.
1118                          */
1119                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1120                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1121                                 continue;
1122
1123                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1124
1125                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1126                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1127                                 LIMIT_NETDEBUG(KERN_DEBUG
1128                                                "ADDRCONF: unspecified / multicast address "
1129                                                "assigned as unicast address on %s",
1130                                                dev->name);
1131                                 continue;
1132                         }
1133
1134                         score->rule = -1;
1135                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1136
1137                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1138                                 int minihiscore, miniscore;
1139
1140                                 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1141                                 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1142
1143                                 if (minihiscore > miniscore) {
1144                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1145                                             score->scopedist > 0) {
1146                                                 /*
1147                                                  * special case:
1148                                                  * each remaining entry
1149                                                  * has too small (not enough)
1150                                                  * scope, because ifa entries
1151                                                  * are sorted by their scope
1152                                                  * values.
1153                                                  */
1154                                                 goto try_nextdev;
1155                                         }
1156                                         break;
1157                                 } else if (minihiscore < miniscore) {
1158                                         struct ipv6_saddr_score *tmp;
1159
1160                                         if (hiscore->ifa)
1161                                                 in6_ifa_put(hiscore->ifa);
1162
1163                                         in6_ifa_hold(score->ifa);
1164
1165                                         tmp = hiscore;
1166                                         hiscore = score;
1167                                         score = tmp;
1168
1169                                         /* restore our iterator */
1170                                         score->ifa = hiscore->ifa;
1171
1172                                         break;
1173                                 }
1174                         }
1175                 }
1176 try_nextdev:
1177                 read_unlock_bh(&idev->lock);
1178         }
1179         rcu_read_unlock();
1180         read_unlock(&dev_base_lock);
1181
1182         if (!hiscore->ifa)
1183                 return -EADDRNOTAVAIL;
1184
1185         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1186         in6_ifa_put(hiscore->ifa);
1187         return 0;
1188 }
1189
1190 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1191
1192 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1193                     unsigned char banned_flags)
1194 {
1195         struct inet6_dev *idev;
1196         int err = -EADDRNOTAVAIL;
1197
1198         rcu_read_lock();
1199         if ((idev = __in6_dev_get(dev)) != NULL) {
1200                 struct inet6_ifaddr *ifp;
1201
1202                 read_lock_bh(&idev->lock);
1203                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1204                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1205                                 ipv6_addr_copy(addr, &ifp->addr);
1206                                 err = 0;
1207                                 break;
1208                         }
1209                 }
1210                 read_unlock_bh(&idev->lock);
1211         }
1212         rcu_read_unlock();
1213         return err;
1214 }
1215
1216 static int ipv6_count_addresses(struct inet6_dev *idev)
1217 {
1218         int cnt = 0;
1219         struct inet6_ifaddr *ifp;
1220
1221         read_lock_bh(&idev->lock);
1222         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1223                 cnt++;
1224         read_unlock_bh(&idev->lock);
1225         return cnt;
1226 }
1227
1228 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1229                   struct net_device *dev, int strict)
1230 {
1231         struct inet6_ifaddr * ifp;
1232         u8 hash = ipv6_addr_hash(addr);
1233
1234         read_lock_bh(&addrconf_hash_lock);
1235         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1236                 if (!net_eq(dev_net(ifp->idev->dev), net))
1237                         continue;
1238                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1239                     !(ifp->flags&IFA_F_TENTATIVE)) {
1240                         if (dev == NULL || ifp->idev->dev == dev ||
1241                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1242                                 break;
1243                 }
1244         }
1245         read_unlock_bh(&addrconf_hash_lock);
1246         return ifp != NULL;
1247 }
1248 EXPORT_SYMBOL(ipv6_chk_addr);
1249
1250 static
1251 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1252                        struct net_device *dev)
1253 {
1254         struct inet6_ifaddr * ifp;
1255         u8 hash = ipv6_addr_hash(addr);
1256
1257         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1258                 if (!net_eq(dev_net(ifp->idev->dev), net))
1259                         continue;
1260                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261                         if (dev == NULL || ifp->idev->dev == dev)
1262                                 break;
1263                 }
1264         }
1265         return ifp != NULL;
1266 }
1267
1268 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1269                                      struct net_device *dev, int strict)
1270 {
1271         struct inet6_ifaddr * ifp;
1272         u8 hash = ipv6_addr_hash(addr);
1273
1274         read_lock_bh(&addrconf_hash_lock);
1275         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1276                 if (!net_eq(dev_net(ifp->idev->dev), net))
1277                         continue;
1278                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1279                         if (dev == NULL || ifp->idev->dev == dev ||
1280                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1281                                 in6_ifa_hold(ifp);
1282                                 break;
1283                         }
1284                 }
1285         }
1286         read_unlock_bh(&addrconf_hash_lock);
1287
1288         return ifp;
1289 }
1290
1291 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1292 {
1293         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1294         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1295         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1296         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1297         int sk_ipv6only = ipv6_only_sock(sk);
1298         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1299         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1300         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1301
1302         if (!sk2_rcv_saddr && !sk_ipv6only)
1303                 return 1;
1304
1305         if (addr_type2 == IPV6_ADDR_ANY &&
1306             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1307                 return 1;
1308
1309         if (addr_type == IPV6_ADDR_ANY &&
1310             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1311                 return 1;
1312
1313         if (sk2_rcv_saddr6 &&
1314             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1315                 return 1;
1316
1317         if (addr_type == IPV6_ADDR_MAPPED &&
1318             !sk2_ipv6only &&
1319             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1320                 return 1;
1321
1322         return 0;
1323 }
1324
1325 /* Gets referenced address, destroys ifaddr */
1326
1327 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1328 {
1329         if (ifp->flags&IFA_F_PERMANENT) {
1330                 spin_lock_bh(&ifp->lock);
1331                 addrconf_del_timer(ifp);
1332                 ifp->flags |= IFA_F_TENTATIVE;
1333                 spin_unlock_bh(&ifp->lock);
1334                 in6_ifa_put(ifp);
1335 #ifdef CONFIG_IPV6_PRIVACY
1336         } else if (ifp->flags&IFA_F_TEMPORARY) {
1337                 struct inet6_ifaddr *ifpub;
1338                 spin_lock_bh(&ifp->lock);
1339                 ifpub = ifp->ifpub;
1340                 if (ifpub) {
1341                         in6_ifa_hold(ifpub);
1342                         spin_unlock_bh(&ifp->lock);
1343                         ipv6_create_tempaddr(ifpub, ifp);
1344                         in6_ifa_put(ifpub);
1345                 } else {
1346                         spin_unlock_bh(&ifp->lock);
1347                 }
1348                 ipv6_del_addr(ifp);
1349 #endif
1350         } else
1351                 ipv6_del_addr(ifp);
1352 }
1353
1354 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1355 {
1356         if (net_ratelimit())
1357                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1358         addrconf_dad_stop(ifp);
1359 }
1360
1361 /* Join to solicited addr multicast group. */
1362
1363 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1364 {
1365         struct in6_addr maddr;
1366
1367         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1368                 return;
1369
1370         addrconf_addr_solict_mult(addr, &maddr);
1371         ipv6_dev_mc_inc(dev, &maddr);
1372 }
1373
1374 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1375 {
1376         struct in6_addr maddr;
1377
1378         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1379                 return;
1380
1381         addrconf_addr_solict_mult(addr, &maddr);
1382         __ipv6_dev_mc_dec(idev, &maddr);
1383 }
1384
1385 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1386 {
1387         struct in6_addr addr;
1388         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1389         if (ipv6_addr_any(&addr))
1390                 return;
1391         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1392 }
1393
1394 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1395 {
1396         struct in6_addr addr;
1397         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1398         if (ipv6_addr_any(&addr))
1399                 return;
1400         __ipv6_dev_ac_dec(ifp->idev, &addr);
1401 }
1402
1403 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1404 {
1405         if (dev->addr_len != ETH_ALEN)
1406                 return -1;
1407         memcpy(eui, dev->dev_addr, 3);
1408         memcpy(eui + 5, dev->dev_addr + 3, 3);
1409
1410         /*
1411          * The zSeries OSA network cards can be shared among various
1412          * OS instances, but the OSA cards have only one MAC address.
1413          * This leads to duplicate address conflicts in conjunction
1414          * with IPv6 if more than one instance uses the same card.
1415          *
1416          * The driver for these cards can deliver a unique 16-bit
1417          * identifier for each instance sharing the same card.  It is
1418          * placed instead of 0xFFFE in the interface identifier.  The
1419          * "u" bit of the interface identifier is not inverted in this
1420          * case.  Hence the resulting interface identifier has local
1421          * scope according to RFC2373.
1422          */
1423         if (dev->dev_id) {
1424                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1425                 eui[4] = dev->dev_id & 0xFF;
1426         } else {
1427                 eui[3] = 0xFF;
1428                 eui[4] = 0xFE;
1429                 eui[0] ^= 2;
1430         }
1431         return 0;
1432 }
1433
1434 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1435 {
1436         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1437         if (dev->addr_len != ARCNET_ALEN)
1438                 return -1;
1439         memset(eui, 0, 7);
1440         eui[7] = *(u8*)dev->dev_addr;
1441         return 0;
1442 }
1443
1444 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1445 {
1446         if (dev->addr_len != INFINIBAND_ALEN)
1447                 return -1;
1448         memcpy(eui, dev->dev_addr + 12, 8);
1449         eui[0] |= 2;
1450         return 0;
1451 }
1452
1453 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1454 {
1455         switch (dev->type) {
1456         case ARPHRD_ETHER:
1457         case ARPHRD_FDDI:
1458         case ARPHRD_IEEE802_TR:
1459                 return addrconf_ifid_eui48(eui, dev);
1460         case ARPHRD_ARCNET:
1461                 return addrconf_ifid_arcnet(eui, dev);
1462         case ARPHRD_INFINIBAND:
1463                 return addrconf_ifid_infiniband(eui, dev);
1464         case ARPHRD_SIT:
1465                 if (dev->priv_flags & IFF_ISATAP)
1466                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1467         }
1468         return -1;
1469 }
1470
1471 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1472 {
1473         int err = -1;
1474         struct inet6_ifaddr *ifp;
1475
1476         read_lock_bh(&idev->lock);
1477         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1478                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1479                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1480                         err = 0;
1481                         break;
1482                 }
1483         }
1484         read_unlock_bh(&idev->lock);
1485         return err;
1486 }
1487
1488 #ifdef CONFIG_IPV6_PRIVACY
1489 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1490 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1491 {
1492 regen:
1493         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1494         idev->rndid[0] &= ~0x02;
1495
1496         /*
1497          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1498          * check if generated address is not inappropriate
1499          *
1500          *  - Reserved subnet anycast (RFC 2526)
1501          *      11111101 11....11 1xxxxxxx
1502          *  - ISATAP (RFC4214) 6.1
1503          *      00-00-5E-FE-xx-xx-xx-xx
1504          *  - value 0
1505          *  - XXX: already assigned to an address on the device
1506          */
1507         if (idev->rndid[0] == 0xfd &&
1508             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1509             (idev->rndid[7]&0x80))
1510                 goto regen;
1511         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1512                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1513                         goto regen;
1514                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1515                         goto regen;
1516         }
1517
1518         return 0;
1519 }
1520
1521 static void ipv6_regen_rndid(unsigned long data)
1522 {
1523         struct inet6_dev *idev = (struct inet6_dev *) data;
1524         unsigned long expires;
1525
1526         rcu_read_lock_bh();
1527         write_lock_bh(&idev->lock);
1528
1529         if (idev->dead)
1530                 goto out;
1531
1532         if (__ipv6_regen_rndid(idev) < 0)
1533                 goto out;
1534
1535         expires = jiffies +
1536                 idev->cnf.temp_prefered_lft * HZ -
1537                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1538         if (time_before(expires, jiffies)) {
1539                 printk(KERN_WARNING
1540                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1541                         idev->dev->name);
1542                 goto out;
1543         }
1544
1545         if (!mod_timer(&idev->regen_timer, expires))
1546                 in6_dev_hold(idev);
1547
1548 out:
1549         write_unlock_bh(&idev->lock);
1550         rcu_read_unlock_bh();
1551         in6_dev_put(idev);
1552 }
1553
1554 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1555         int ret = 0;
1556
1557         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1558                 ret = __ipv6_regen_rndid(idev);
1559         return ret;
1560 }
1561 #endif
1562
1563 /*
1564  *      Add prefix route.
1565  */
1566
1567 static void
1568 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1569                       unsigned long expires, u32 flags)
1570 {
1571         struct fib6_config cfg = {
1572                 .fc_table = RT6_TABLE_PREFIX,
1573                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1574                 .fc_ifindex = dev->ifindex,
1575                 .fc_expires = expires,
1576                 .fc_dst_len = plen,
1577                 .fc_flags = RTF_UP | flags,
1578                 .fc_nlinfo.nl_net = dev_net(dev),
1579         };
1580
1581         ipv6_addr_copy(&cfg.fc_dst, pfx);
1582
1583         /* Prevent useless cloning on PtP SIT.
1584            This thing is done here expecting that the whole
1585            class of non-broadcast devices need not cloning.
1586          */
1587 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1588         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1589                 cfg.fc_flags |= RTF_NONEXTHOP;
1590 #endif
1591
1592         ip6_route_add(&cfg);
1593 }
1594
1595 /* Create "default" multicast route to the interface */
1596
1597 static void addrconf_add_mroute(struct net_device *dev)
1598 {
1599         struct fib6_config cfg = {
1600                 .fc_table = RT6_TABLE_LOCAL,
1601                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1602                 .fc_ifindex = dev->ifindex,
1603                 .fc_dst_len = 8,
1604                 .fc_flags = RTF_UP,
1605                 .fc_nlinfo.nl_net = dev_net(dev),
1606         };
1607
1608         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1609
1610         ip6_route_add(&cfg);
1611 }
1612
1613 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1614 static void sit_route_add(struct net_device *dev)
1615 {
1616         struct fib6_config cfg = {
1617                 .fc_table = RT6_TABLE_MAIN,
1618                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1619                 .fc_ifindex = dev->ifindex,
1620                 .fc_dst_len = 96,
1621                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1622                 .fc_nlinfo.nl_net = dev_net(dev),
1623         };
1624
1625         /* prefix length - 96 bits "::d.d.d.d" */
1626         ip6_route_add(&cfg);
1627 }
1628 #endif
1629
1630 static void addrconf_add_lroute(struct net_device *dev)
1631 {
1632         struct in6_addr addr;
1633
1634         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1635         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1636 }
1637
1638 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1639 {
1640         struct inet6_dev *idev;
1641
1642         ASSERT_RTNL();
1643
1644         if ((idev = ipv6_find_idev(dev)) == NULL)
1645                 return NULL;
1646
1647         /* Add default multicast route */
1648         addrconf_add_mroute(dev);
1649
1650         /* Add link local route */
1651         addrconf_add_lroute(dev);
1652         return idev;
1653 }
1654
1655 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1656 {
1657         struct prefix_info *pinfo;
1658         __u32 valid_lft;
1659         __u32 prefered_lft;
1660         int addr_type;
1661         unsigned long rt_expires;
1662         struct inet6_dev *in6_dev;
1663
1664         pinfo = (struct prefix_info *) opt;
1665
1666         if (len < sizeof(struct prefix_info)) {
1667                 ADBG(("addrconf: prefix option too short\n"));
1668                 return;
1669         }
1670
1671         /*
1672          *      Validation checks ([ADDRCONF], page 19)
1673          */
1674
1675         addr_type = ipv6_addr_type(&pinfo->prefix);
1676
1677         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1678                 return;
1679
1680         valid_lft = ntohl(pinfo->valid);
1681         prefered_lft = ntohl(pinfo->prefered);
1682
1683         if (prefered_lft > valid_lft) {
1684                 if (net_ratelimit())
1685                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1686                 return;
1687         }
1688
1689         in6_dev = in6_dev_get(dev);
1690
1691         if (in6_dev == NULL) {
1692                 if (net_ratelimit())
1693                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1694                 return;
1695         }
1696
1697         /*
1698          *      Two things going on here:
1699          *      1) Add routes for on-link prefixes
1700          *      2) Configure prefixes with the auto flag set
1701          */
1702
1703         /* Avoid arithmetic overflow. Really, we could
1704            save rt_expires in seconds, likely valid_lft,
1705            but it would require division in fib gc, that it
1706            not good.
1707          */
1708         if (valid_lft >= 0x7FFFFFFF/HZ)
1709                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1710         else
1711                 rt_expires = valid_lft * HZ;
1712
1713         /*
1714          * We convert this (in jiffies) to clock_t later.
1715          * Avoid arithmetic overflow there as well.
1716          * Overflow can happen only if HZ < USER_HZ.
1717          */
1718         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1719                 rt_expires = 0x7FFFFFFF / USER_HZ;
1720
1721         if (pinfo->onlink) {
1722                 struct rt6_info *rt;
1723                 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1724                                 dev->ifindex, 1);
1725
1726                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1727                         if (rt->rt6i_flags&RTF_EXPIRES) {
1728                                 if (valid_lft == 0) {
1729                                         ip6_del_rt(rt);
1730                                         rt = NULL;
1731                                 } else {
1732                                         rt->rt6i_expires = jiffies + rt_expires;
1733                                 }
1734                         }
1735                 } else if (valid_lft) {
1736                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1737                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1738                 }
1739                 if (rt)
1740                         dst_release(&rt->u.dst);
1741         }
1742
1743         /* Try to figure out our local address for this prefix */
1744
1745         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1746                 struct inet6_ifaddr * ifp;
1747                 struct in6_addr addr;
1748                 int create = 0, update_lft = 0;
1749
1750                 if (pinfo->prefix_len == 64) {
1751                         memcpy(&addr, &pinfo->prefix, 8);
1752                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1753                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1754                                 in6_dev_put(in6_dev);
1755                                 return;
1756                         }
1757                         goto ok;
1758                 }
1759                 if (net_ratelimit())
1760                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1761                                pinfo->prefix_len);
1762                 in6_dev_put(in6_dev);
1763                 return;
1764
1765 ok:
1766
1767                 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1768
1769                 if (ifp == NULL && valid_lft) {
1770                         int max_addresses = in6_dev->cnf.max_addresses;
1771                         u32 addr_flags = 0;
1772
1773 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1774                         if (in6_dev->cnf.optimistic_dad &&
1775                             !ipv6_devconf.forwarding)
1776                                 addr_flags = IFA_F_OPTIMISTIC;
1777 #endif
1778
1779                         /* Do not allow to create too much of autoconfigured
1780                          * addresses; this would be too easy way to crash kernel.
1781                          */
1782                         if (!max_addresses ||
1783                             ipv6_count_addresses(in6_dev) < max_addresses)
1784                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1785                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1786                                                     addr_flags);
1787
1788                         if (!ifp || IS_ERR(ifp)) {
1789                                 in6_dev_put(in6_dev);
1790                                 return;
1791                         }
1792
1793                         update_lft = create = 1;
1794                         ifp->cstamp = jiffies;
1795                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1796                 }
1797
1798                 if (ifp) {
1799                         int flags;
1800                         unsigned long now;
1801 #ifdef CONFIG_IPV6_PRIVACY
1802                         struct inet6_ifaddr *ift;
1803 #endif
1804                         u32 stored_lft;
1805
1806                         /* update lifetime (RFC2462 5.5.3 e) */
1807                         spin_lock(&ifp->lock);
1808                         now = jiffies;
1809                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1810                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1811                         else
1812                                 stored_lft = 0;
1813                         if (!update_lft && stored_lft) {
1814                                 if (valid_lft > MIN_VALID_LIFETIME ||
1815                                     valid_lft > stored_lft)
1816                                         update_lft = 1;
1817                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1818                                         /* valid_lft <= stored_lft is always true */
1819                                         /* XXX: IPsec */
1820                                         update_lft = 0;
1821                                 } else {
1822                                         valid_lft = MIN_VALID_LIFETIME;
1823                                         if (valid_lft < prefered_lft)
1824                                                 prefered_lft = valid_lft;
1825                                         update_lft = 1;
1826                                 }
1827                         }
1828
1829                         if (update_lft) {
1830                                 ifp->valid_lft = valid_lft;
1831                                 ifp->prefered_lft = prefered_lft;
1832                                 ifp->tstamp = now;
1833                                 flags = ifp->flags;
1834                                 ifp->flags &= ~IFA_F_DEPRECATED;
1835                                 spin_unlock(&ifp->lock);
1836
1837                                 if (!(flags&IFA_F_TENTATIVE))
1838                                         ipv6_ifa_notify(0, ifp);
1839                         } else
1840                                 spin_unlock(&ifp->lock);
1841
1842 #ifdef CONFIG_IPV6_PRIVACY
1843                         read_lock_bh(&in6_dev->lock);
1844                         /* update all temporary addresses in the list */
1845                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1846                                 /*
1847                                  * When adjusting the lifetimes of an existing
1848                                  * temporary address, only lower the lifetimes.
1849                                  * Implementations must not increase the
1850                                  * lifetimes of an existing temporary address
1851                                  * when processing a Prefix Information Option.
1852                                  */
1853                                 if (ifp != ift->ifpub)
1854                                         continue;
1855
1856                                 spin_lock(&ift->lock);
1857                                 flags = ift->flags;
1858                                 if (ift->valid_lft > valid_lft &&
1859                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1860                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1861                                 if (ift->prefered_lft > prefered_lft &&
1862                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1863                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1864                                 spin_unlock(&ift->lock);
1865                                 if (!(flags&IFA_F_TENTATIVE))
1866                                         ipv6_ifa_notify(0, ift);
1867                         }
1868
1869                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1870                                 /*
1871                                  * When a new public address is created as described in [ADDRCONF],
1872                                  * also create a new temporary address.
1873                                  */
1874                                 read_unlock_bh(&in6_dev->lock);
1875                                 ipv6_create_tempaddr(ifp, NULL);
1876                         } else {
1877                                 read_unlock_bh(&in6_dev->lock);
1878                         }
1879 #endif
1880                         in6_ifa_put(ifp);
1881                         addrconf_verify(0);
1882                 }
1883         }
1884         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1885         in6_dev_put(in6_dev);
1886 }
1887
1888 /*
1889  *      Set destination address.
1890  *      Special case for SIT interfaces where we create a new "virtual"
1891  *      device.
1892  */
1893 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1894 {
1895         struct in6_ifreq ireq;
1896         struct net_device *dev;
1897         int err = -EINVAL;
1898
1899         rtnl_lock();
1900
1901         err = -EFAULT;
1902         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1903                 goto err_exit;
1904
1905         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1906
1907         err = -ENODEV;
1908         if (dev == NULL)
1909                 goto err_exit;
1910
1911 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1912         if (dev->type == ARPHRD_SIT) {
1913                 struct ifreq ifr;
1914                 mm_segment_t    oldfs;
1915                 struct ip_tunnel_parm p;
1916
1917                 err = -EADDRNOTAVAIL;
1918                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1919                         goto err_exit;
1920
1921                 memset(&p, 0, sizeof(p));
1922                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1923                 p.iph.saddr = 0;
1924                 p.iph.version = 4;
1925                 p.iph.ihl = 5;
1926                 p.iph.protocol = IPPROTO_IPV6;
1927                 p.iph.ttl = 64;
1928                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1929
1930                 oldfs = get_fs(); set_fs(KERNEL_DS);
1931                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1932                 set_fs(oldfs);
1933
1934                 if (err == 0) {
1935                         err = -ENOBUFS;
1936                         dev = __dev_get_by_name(net, p.name);
1937                         if (!dev)
1938                                 goto err_exit;
1939                         err = dev_open(dev);
1940                 }
1941         }
1942 #endif
1943
1944 err_exit:
1945         rtnl_unlock();
1946         return err;
1947 }
1948
1949 /*
1950  *      Manual configuration of address on an interface
1951  */
1952 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1953                           int plen, __u8 ifa_flags, __u32 prefered_lft,
1954                           __u32 valid_lft)
1955 {
1956         struct inet6_ifaddr *ifp;
1957         struct inet6_dev *idev;
1958         struct net_device *dev;
1959         int scope;
1960         u32 flags = RTF_EXPIRES;
1961
1962         ASSERT_RTNL();
1963
1964         /* check the lifetime */
1965         if (!valid_lft || prefered_lft > valid_lft)
1966                 return -EINVAL;
1967
1968         dev = __dev_get_by_index(net, ifindex);
1969         if (!dev)
1970                 return -ENODEV;
1971
1972         if ((idev = addrconf_add_dev(dev)) == NULL)
1973                 return -ENOBUFS;
1974
1975         scope = ipv6_addr_scope(pfx);
1976
1977         if (valid_lft == INFINITY_LIFE_TIME) {
1978                 ifa_flags |= IFA_F_PERMANENT;
1979                 flags = 0;
1980         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1981                 valid_lft = 0x7FFFFFFF/HZ;
1982
1983         if (prefered_lft == 0)
1984                 ifa_flags |= IFA_F_DEPRECATED;
1985         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1986                  (prefered_lft != INFINITY_LIFE_TIME))
1987                 prefered_lft = 0x7FFFFFFF/HZ;
1988
1989         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1990
1991         if (!IS_ERR(ifp)) {
1992                 spin_lock_bh(&ifp->lock);
1993                 ifp->valid_lft = valid_lft;
1994                 ifp->prefered_lft = prefered_lft;
1995                 ifp->tstamp = jiffies;
1996                 spin_unlock_bh(&ifp->lock);
1997
1998                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1999                                       jiffies_to_clock_t(valid_lft * HZ), flags);
2000                 /*
2001                  * Note that section 3.1 of RFC 4429 indicates
2002                  * that the Optimistic flag should not be set for
2003                  * manually configured addresses
2004                  */
2005                 addrconf_dad_start(ifp, 0);
2006                 in6_ifa_put(ifp);
2007                 addrconf_verify(0);
2008                 return 0;
2009         }
2010
2011         return PTR_ERR(ifp);
2012 }
2013
2014 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2015                           int plen)
2016 {
2017         struct inet6_ifaddr *ifp;
2018         struct inet6_dev *idev;
2019         struct net_device *dev;
2020
2021         dev = __dev_get_by_index(net, ifindex);
2022         if (!dev)
2023                 return -ENODEV;
2024
2025         if ((idev = __in6_dev_get(dev)) == NULL)
2026                 return -ENXIO;
2027
2028         read_lock_bh(&idev->lock);
2029         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2030                 if (ifp->prefix_len == plen &&
2031                     ipv6_addr_equal(pfx, &ifp->addr)) {
2032                         in6_ifa_hold(ifp);
2033                         read_unlock_bh(&idev->lock);
2034
2035                         ipv6_del_addr(ifp);
2036
2037                         /* If the last address is deleted administratively,
2038                            disable IPv6 on this interface.
2039                          */
2040                         if (idev->addr_list == NULL)
2041                                 addrconf_ifdown(idev->dev, 1);
2042                         return 0;
2043                 }
2044         }
2045         read_unlock_bh(&idev->lock);
2046         return -EADDRNOTAVAIL;
2047 }
2048
2049
2050 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2051 {
2052         struct in6_ifreq ireq;
2053         int err;
2054
2055         if (!capable(CAP_NET_ADMIN))
2056                 return -EPERM;
2057
2058         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2059                 return -EFAULT;
2060
2061         rtnl_lock();
2062         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2063                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2064                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2065         rtnl_unlock();
2066         return err;
2067 }
2068
2069 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2070 {
2071         struct in6_ifreq ireq;
2072         int err;
2073
2074         if (!capable(CAP_NET_ADMIN))
2075                 return -EPERM;
2076
2077         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2078                 return -EFAULT;
2079
2080         rtnl_lock();
2081         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2082                              ireq.ifr6_prefixlen);
2083         rtnl_unlock();
2084         return err;
2085 }
2086
2087 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2088 static void sit_add_v4_addrs(struct inet6_dev *idev)
2089 {
2090         struct inet6_ifaddr * ifp;
2091         struct in6_addr addr;
2092         struct net_device *dev;
2093         struct net *net = dev_net(idev->dev);
2094         int scope;
2095
2096         ASSERT_RTNL();
2097
2098         memset(&addr, 0, sizeof(struct in6_addr));
2099         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2100
2101         if (idev->dev->flags&IFF_POINTOPOINT) {
2102                 addr.s6_addr32[0] = htonl(0xfe800000);
2103                 scope = IFA_LINK;
2104         } else {
2105                 scope = IPV6_ADDR_COMPATv4;
2106         }
2107
2108         if (addr.s6_addr32[3]) {
2109                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2110                 if (!IS_ERR(ifp)) {
2111                         spin_lock_bh(&ifp->lock);
2112                         ifp->flags &= ~IFA_F_TENTATIVE;
2113                         spin_unlock_bh(&ifp->lock);
2114                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2115                         in6_ifa_put(ifp);
2116                 }
2117                 return;
2118         }
2119
2120         for_each_netdev(net, dev) {
2121                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2122                 if (in_dev && (dev->flags & IFF_UP)) {
2123                         struct in_ifaddr * ifa;
2124
2125                         int flag = scope;
2126
2127                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2128                                 int plen;
2129
2130                                 addr.s6_addr32[3] = ifa->ifa_local;
2131
2132                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2133                                         continue;
2134                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2135                                         if (idev->dev->flags&IFF_POINTOPOINT)
2136                                                 continue;
2137                                         flag |= IFA_HOST;
2138                                 }
2139                                 if (idev->dev->flags&IFF_POINTOPOINT)
2140                                         plen = 64;
2141                                 else
2142                                         plen = 96;
2143
2144                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2145                                                     IFA_F_PERMANENT);
2146                                 if (!IS_ERR(ifp)) {
2147                                         spin_lock_bh(&ifp->lock);
2148                                         ifp->flags &= ~IFA_F_TENTATIVE;
2149                                         spin_unlock_bh(&ifp->lock);
2150                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2151                                         in6_ifa_put(ifp);
2152                                 }
2153                         }
2154                 }
2155         }
2156 }
2157 #endif
2158
2159 static void init_loopback(struct net_device *dev)
2160 {
2161         struct inet6_dev  *idev;
2162         struct inet6_ifaddr * ifp;
2163
2164         /* ::1 */
2165
2166         ASSERT_RTNL();
2167
2168         if ((idev = ipv6_find_idev(dev)) == NULL) {
2169                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2170                 return;
2171         }
2172
2173         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2174         if (!IS_ERR(ifp)) {
2175                 spin_lock_bh(&ifp->lock);
2176                 ifp->flags &= ~IFA_F_TENTATIVE;
2177                 spin_unlock_bh(&ifp->lock);
2178                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2179                 in6_ifa_put(ifp);
2180         }
2181 }
2182
2183 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2184 {
2185         struct inet6_ifaddr * ifp;
2186         u32 addr_flags = IFA_F_PERMANENT;
2187
2188 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2189         if (idev->cnf.optimistic_dad &&
2190             !ipv6_devconf.forwarding)
2191                 addr_flags |= IFA_F_OPTIMISTIC;
2192 #endif
2193
2194
2195         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2196         if (!IS_ERR(ifp)) {
2197                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2198                 addrconf_dad_start(ifp, 0);
2199                 in6_ifa_put(ifp);
2200         }
2201 }
2202
2203 static void addrconf_dev_config(struct net_device *dev)
2204 {
2205         struct in6_addr addr;
2206         struct inet6_dev    * idev;
2207
2208         ASSERT_RTNL();
2209
2210         if ((dev->type != ARPHRD_ETHER) &&
2211             (dev->type != ARPHRD_FDDI) &&
2212             (dev->type != ARPHRD_IEEE802_TR) &&
2213             (dev->type != ARPHRD_ARCNET) &&
2214             (dev->type != ARPHRD_INFINIBAND)) {
2215                 /* Alas, we support only Ethernet autoconfiguration. */
2216                 return;
2217         }
2218
2219         idev = addrconf_add_dev(dev);
2220         if (idev == NULL)
2221                 return;
2222
2223         memset(&addr, 0, sizeof(struct in6_addr));
2224         addr.s6_addr32[0] = htonl(0xFE800000);
2225
2226         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2227                 addrconf_add_linklocal(idev, &addr);
2228 }
2229
2230 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2231 static void addrconf_sit_config(struct net_device *dev)
2232 {
2233         struct inet6_dev *idev;
2234
2235         ASSERT_RTNL();
2236
2237         /*
2238          * Configure the tunnel with one of our IPv4
2239          * addresses... we should configure all of
2240          * our v4 addrs in the tunnel
2241          */
2242
2243         if ((idev = ipv6_find_idev(dev)) == NULL) {
2244                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2245                 return;
2246         }
2247
2248         if (dev->priv_flags & IFF_ISATAP) {
2249                 struct in6_addr addr;
2250
2251                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2252                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2253                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2254                         addrconf_add_linklocal(idev, &addr);
2255                 return;
2256         }
2257
2258         sit_add_v4_addrs(idev);
2259
2260         if (dev->flags&IFF_POINTOPOINT) {
2261                 addrconf_add_mroute(dev);
2262                 addrconf_add_lroute(dev);
2263         } else
2264                 sit_route_add(dev);
2265 }
2266 #endif
2267
2268 static inline int
2269 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2270 {
2271         struct in6_addr lladdr;
2272
2273         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2274                 addrconf_add_linklocal(idev, &lladdr);
2275                 return 0;
2276         }
2277         return -1;
2278 }
2279
2280 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2281 {
2282         struct net_device *link_dev;
2283         struct net *net = dev_net(idev->dev);
2284
2285         /* first try to inherit the link-local address from the link device */
2286         if (idev->dev->iflink &&
2287             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2288                 if (!ipv6_inherit_linklocal(idev, link_dev))
2289                         return;
2290         }
2291         /* then try to inherit it from any device */
2292         for_each_netdev(net, link_dev) {
2293                 if (!ipv6_inherit_linklocal(idev, link_dev))
2294                         return;
2295         }
2296         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2297 }
2298
2299 /*
2300  * Autoconfigure tunnel with a link-local address so routing protocols,
2301  * DHCPv6, MLD etc. can be run over the virtual link
2302  */
2303
2304 static void addrconf_ip6_tnl_config(struct net_device *dev)
2305 {
2306         struct inet6_dev *idev;
2307
2308         ASSERT_RTNL();
2309
2310         if ((idev = addrconf_add_dev(dev)) == NULL) {
2311                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2312                 return;
2313         }
2314         ip6_tnl_add_linklocal(idev);
2315 }
2316
2317 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2318                            void * data)
2319 {
2320         struct net_device *dev = (struct net_device *) data;
2321         struct inet6_dev *idev = __in6_dev_get(dev);
2322         int run_pending = 0;
2323         int err;
2324
2325         switch(event) {
2326         case NETDEV_REGISTER:
2327                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2328                         idev = ipv6_add_dev(dev);
2329                         if (!idev)
2330                                 return notifier_from_errno(-ENOMEM);
2331                 }
2332                 break;
2333         case NETDEV_UP:
2334         case NETDEV_CHANGE:
2335                 if (dev->flags & IFF_SLAVE)
2336                         break;
2337
2338                 if (event == NETDEV_UP) {
2339                         if (!addrconf_qdisc_ok(dev)) {
2340                                 /* device is not ready yet. */
2341                                 printk(KERN_INFO
2342                                         "ADDRCONF(NETDEV_UP): %s: "
2343                                         "link is not ready\n",
2344                                         dev->name);
2345                                 break;
2346                         }
2347
2348                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2349                                 idev = ipv6_add_dev(dev);
2350
2351                         if (idev)
2352                                 idev->if_flags |= IF_READY;
2353                 } else {
2354                         if (!addrconf_qdisc_ok(dev)) {
2355                                 /* device is still not ready. */
2356                                 break;
2357                         }
2358
2359                         if (idev) {
2360                                 if (idev->if_flags & IF_READY) {
2361                                         /* device is already configured. */
2362                                         break;
2363                                 }
2364                                 idev->if_flags |= IF_READY;
2365                         }
2366
2367                         printk(KERN_INFO
2368                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2369                                         "link becomes ready\n",
2370                                         dev->name);
2371
2372                         run_pending = 1;
2373                 }
2374
2375                 switch(dev->type) {
2376 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2377                 case ARPHRD_SIT:
2378                         addrconf_sit_config(dev);
2379                         break;
2380 #endif
2381                 case ARPHRD_TUNNEL6:
2382                         addrconf_ip6_tnl_config(dev);
2383                         break;
2384                 case ARPHRD_LOOPBACK:
2385                         init_loopback(dev);
2386                         break;
2387
2388                 default:
2389                         addrconf_dev_config(dev);
2390                         break;
2391                 }
2392                 if (idev) {
2393                         if (run_pending)
2394                                 addrconf_dad_run(idev);
2395
2396                         /* If the MTU changed during the interface down, when the
2397                            interface up, the changed MTU must be reflected in the
2398                            idev as well as routers.
2399                          */
2400                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2401                                 rt6_mtu_change(dev, dev->mtu);
2402                                 idev->cnf.mtu6 = dev->mtu;
2403                         }
2404                         idev->tstamp = jiffies;
2405                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2406                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2407                            stop IPv6 on this interface.
2408                          */
2409                         if (dev->mtu < IPV6_MIN_MTU)
2410                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2411                 }
2412                 break;
2413
2414         case NETDEV_CHANGEMTU:
2415                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2416                         rt6_mtu_change(dev, dev->mtu);
2417                         idev->cnf.mtu6 = dev->mtu;
2418                         break;
2419                 }
2420
2421                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2422                         idev = ipv6_add_dev(dev);
2423                         if (idev)
2424                                 break;
2425                 }
2426
2427                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2428
2429         case NETDEV_DOWN:
2430         case NETDEV_UNREGISTER:
2431                 /*
2432                  *      Remove all addresses from this interface.
2433                  */
2434                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2435                 break;
2436
2437         case NETDEV_CHANGENAME:
2438                 if (idev) {
2439                         snmp6_unregister_dev(idev);
2440                         addrconf_sysctl_unregister(idev);
2441                         addrconf_sysctl_register(idev);
2442                         err = snmp6_register_dev(idev);
2443                         if (err)
2444                                 return notifier_from_errno(err);
2445                 }
2446                 break;
2447         }
2448
2449         return NOTIFY_OK;
2450 }
2451
2452 /*
2453  *      addrconf module should be notified of a device going up
2454  */
2455 static struct notifier_block ipv6_dev_notf = {
2456         .notifier_call = addrconf_notify,
2457         .priority = 0
2458 };
2459
2460 static int addrconf_ifdown(struct net_device *dev, int how)
2461 {
2462         struct inet6_dev *idev;
2463         struct inet6_ifaddr *ifa, **bifa;
2464         struct net *net = dev_net(dev);
2465         int i;
2466
2467         ASSERT_RTNL();
2468
2469         if (dev == init_net.loopback_dev && how == 1)
2470                 how = 0;
2471
2472         rt6_ifdown(net, dev);
2473         neigh_ifdown(&nd_tbl, dev);
2474
2475         idev = __in6_dev_get(dev);
2476         if (idev == NULL)
2477                 return -ENODEV;
2478
2479         /* Step 1: remove reference to ipv6 device from parent device.
2480                    Do not dev_put!
2481          */
2482         if (how == 1) {
2483                 idev->dead = 1;
2484
2485                 /* protected by rtnl_lock */
2486                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2487
2488                 /* Step 1.5: remove snmp6 entry */
2489                 snmp6_unregister_dev(idev);
2490
2491         }
2492
2493         /* Step 2: clear hash table */
2494         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2495                 bifa = &inet6_addr_lst[i];
2496
2497                 write_lock_bh(&addrconf_hash_lock);
2498                 while ((ifa = *bifa) != NULL) {
2499                         if (ifa->idev == idev) {
2500                                 *bifa = ifa->lst_next;
2501                                 ifa->lst_next = NULL;
2502                                 addrconf_del_timer(ifa);
2503                                 in6_ifa_put(ifa);
2504                                 continue;
2505                         }
2506                         bifa = &ifa->lst_next;
2507                 }
2508                 write_unlock_bh(&addrconf_hash_lock);
2509         }
2510
2511         write_lock_bh(&idev->lock);
2512
2513         /* Step 3: clear flags for stateless addrconf */
2514         if (how != 1)
2515                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2516
2517         /* Step 4: clear address list */
2518 #ifdef CONFIG_IPV6_PRIVACY
2519         if (how == 1 && del_timer(&idev->regen_timer))
2520                 in6_dev_put(idev);
2521
2522         /* clear tempaddr list */
2523         while ((ifa = idev->tempaddr_list) != NULL) {
2524                 idev->tempaddr_list = ifa->tmp_next;
2525                 ifa->tmp_next = NULL;
2526                 ifa->dead = 1;
2527                 write_unlock_bh(&idev->lock);
2528                 spin_lock_bh(&ifa->lock);
2529
2530                 if (ifa->ifpub) {
2531                         in6_ifa_put(ifa->ifpub);
2532                         ifa->ifpub = NULL;
2533                 }
2534                 spin_unlock_bh(&ifa->lock);
2535                 in6_ifa_put(ifa);
2536                 write_lock_bh(&idev->lock);
2537         }
2538 #endif
2539         while ((ifa = idev->addr_list) != NULL) {
2540                 idev->addr_list = ifa->if_next;
2541                 ifa->if_next = NULL;
2542                 ifa->dead = 1;
2543                 addrconf_del_timer(ifa);
2544                 write_unlock_bh(&idev->lock);
2545
2546                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2547                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2548                 in6_ifa_put(ifa);
2549
2550                 write_lock_bh(&idev->lock);
2551         }
2552         write_unlock_bh(&idev->lock);
2553
2554         /* Step 5: Discard multicast list */
2555
2556         if (how == 1)
2557                 ipv6_mc_destroy_dev(idev);
2558         else
2559                 ipv6_mc_down(idev);
2560
2561         idev->tstamp = jiffies;
2562
2563         /* Shot the device (if unregistered) */
2564
2565         if (how == 1) {
2566                 addrconf_sysctl_unregister(idev);
2567                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2568                 neigh_ifdown(&nd_tbl, dev);
2569                 in6_dev_put(idev);
2570         }
2571         return 0;
2572 }
2573
2574 static void addrconf_rs_timer(unsigned long data)
2575 {
2576         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2577
2578         if (ifp->idev->cnf.forwarding)
2579                 goto out;
2580
2581         if (ifp->idev->if_flags & IF_RA_RCVD) {
2582                 /*
2583                  *      Announcement received after solicitation
2584                  *      was sent
2585                  */
2586                 goto out;
2587         }
2588
2589         spin_lock(&ifp->lock);
2590         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2591                 struct in6_addr all_routers;
2592
2593                 /* The wait after the last probe can be shorter */
2594                 addrconf_mod_timer(ifp, AC_RS,
2595                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2596                                    ifp->idev->cnf.rtr_solicit_delay :
2597                                    ifp->idev->cnf.rtr_solicit_interval);
2598                 spin_unlock(&ifp->lock);
2599
2600                 ipv6_addr_all_routers(&all_routers);
2601
2602                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2603         } else {
2604                 spin_unlock(&ifp->lock);
2605                 /*
2606                  * Note: we do not support deprecated "all on-link"
2607                  * assumption any longer.
2608                  */
2609                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2610                        ifp->idev->dev->name);
2611         }
2612
2613 out:
2614         in6_ifa_put(ifp);
2615 }
2616
2617 /*
2618  *      Duplicate Address Detection
2619  */
2620 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2621 {
2622         unsigned long rand_num;
2623         struct inet6_dev *idev = ifp->idev;
2624
2625         if (ifp->flags & IFA_F_OPTIMISTIC)
2626                 rand_num = 0;
2627         else
2628                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2629
2630         ifp->probes = idev->cnf.dad_transmits;
2631         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2632 }
2633
2634 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2635 {
2636         struct inet6_dev *idev = ifp->idev;
2637         struct net_device *dev = idev->dev;
2638
2639         addrconf_join_solict(dev, &ifp->addr);
2640
2641         net_srandom(ifp->addr.s6_addr32[3]);
2642
2643         read_lock_bh(&idev->lock);
2644         if (ifp->dead)
2645                 goto out;
2646         spin_lock_bh(&ifp->lock);
2647
2648         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2649             !(ifp->flags&IFA_F_TENTATIVE) ||
2650             ifp->flags & IFA_F_NODAD) {
2651                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2652                 spin_unlock_bh(&ifp->lock);
2653                 read_unlock_bh(&idev->lock);
2654
2655                 addrconf_dad_completed(ifp);
2656                 return;
2657         }
2658
2659         if (!(idev->if_flags & IF_READY)) {
2660                 spin_unlock_bh(&ifp->lock);
2661                 read_unlock_bh(&idev->lock);
2662                 /*
2663                  * If the defice is not ready:
2664                  * - keep it tentative if it is a permanent address.
2665                  * - otherwise, kill it.
2666                  */
2667                 in6_ifa_hold(ifp);
2668                 addrconf_dad_stop(ifp);
2669                 return;
2670         }
2671
2672         /*
2673          * Optimistic nodes can start receiving
2674          * Frames right away
2675          */
2676         if(ifp->flags & IFA_F_OPTIMISTIC)
2677                 ip6_ins_rt(ifp->rt);
2678
2679         addrconf_dad_kick(ifp);
2680         spin_unlock_bh(&ifp->lock);
2681 out:
2682         read_unlock_bh(&idev->lock);
2683 }
2684
2685 static void addrconf_dad_timer(unsigned long data)
2686 {
2687         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2688         struct inet6_dev *idev = ifp->idev;
2689         struct in6_addr unspec;
2690         struct in6_addr mcaddr;
2691
2692         read_lock_bh(&idev->lock);
2693         if (idev->dead) {
2694                 read_unlock_bh(&idev->lock);
2695                 goto out;
2696         }
2697         spin_lock_bh(&ifp->lock);
2698         if (ifp->probes == 0) {
2699                 /*
2700                  * DAD was successful
2701                  */
2702
2703                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2704                 spin_unlock_bh(&ifp->lock);
2705                 read_unlock_bh(&idev->lock);
2706
2707                 addrconf_dad_completed(ifp);
2708
2709                 goto out;
2710         }
2711
2712         ifp->probes--;
2713         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2714         spin_unlock_bh(&ifp->lock);
2715         read_unlock_bh(&idev->lock);
2716
2717         /* send a neighbour solicitation for our addr */
2718         memset(&unspec, 0, sizeof(unspec));
2719         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2720         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2721 out:
2722         in6_ifa_put(ifp);
2723 }
2724
2725 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2726 {
2727         struct net_device *     dev = ifp->idev->dev;
2728
2729         /*
2730          *      Configure the address for reception. Now it is valid.
2731          */
2732
2733         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2734
2735         /* If added prefix is link local and forwarding is off,
2736            start sending router solicitations.
2737          */
2738
2739         if (ifp->idev->cnf.forwarding == 0 &&
2740             ifp->idev->cnf.rtr_solicits > 0 &&
2741             (dev->flags&IFF_LOOPBACK) == 0 &&
2742             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2743                 struct in6_addr all_routers;
2744
2745                 ipv6_addr_all_routers(&all_routers);
2746
2747                 /*
2748                  *      If a host as already performed a random delay
2749                  *      [...] as part of DAD [...] there is no need
2750                  *      to delay again before sending the first RS
2751                  */
2752                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2753
2754                 spin_lock_bh(&ifp->lock);
2755                 ifp->probes = 1;
2756                 ifp->idev->if_flags |= IF_RS_SENT;
2757                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2758                 spin_unlock_bh(&ifp->lock);
2759         }
2760 }
2761
2762 static void addrconf_dad_run(struct inet6_dev *idev) {
2763         struct inet6_ifaddr *ifp;
2764
2765         read_lock_bh(&idev->lock);
2766         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2767                 spin_lock_bh(&ifp->lock);
2768                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2769                         spin_unlock_bh(&ifp->lock);
2770                         continue;
2771                 }
2772                 spin_unlock_bh(&ifp->lock);
2773                 addrconf_dad_kick(ifp);
2774         }
2775         read_unlock_bh(&idev->lock);
2776 }
2777
2778 #ifdef CONFIG_PROC_FS
2779 struct if6_iter_state {
2780         struct seq_net_private p;
2781         int bucket;
2782 };
2783
2784 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2785 {
2786         struct inet6_ifaddr *ifa = NULL;
2787         struct if6_iter_state *state = seq->private;
2788         struct net *net = seq_file_net(seq);
2789
2790         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2791                 ifa = inet6_addr_lst[state->bucket];
2792
2793                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2794                         ifa = ifa->lst_next;
2795                 if (ifa)
2796                         break;
2797         }
2798         return ifa;
2799 }
2800
2801 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2802 {
2803         struct if6_iter_state *state = seq->private;
2804         struct net *net = seq_file_net(seq);
2805
2806         ifa = ifa->lst_next;
2807 try_again:
2808         if (ifa) {
2809                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2810                         ifa = ifa->lst_next;
2811                         goto try_again;
2812                 }
2813         }
2814
2815         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2816                 ifa = inet6_addr_lst[state->bucket];
2817                 goto try_again;
2818         }
2819
2820         return ifa;
2821 }
2822
2823 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2824 {
2825         struct inet6_ifaddr *ifa = if6_get_first(seq);
2826
2827         if (ifa)
2828                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2829                         --pos;
2830         return pos ? NULL : ifa;
2831 }
2832
2833 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2834         __acquires(addrconf_hash_lock)
2835 {
2836         read_lock_bh(&addrconf_hash_lock);
2837         return if6_get_idx(seq, *pos);
2838 }
2839
2840 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2841 {
2842         struct inet6_ifaddr *ifa;
2843
2844         ifa = if6_get_next(seq, v);
2845         ++*pos;
2846         return ifa;
2847 }
2848
2849 static void if6_seq_stop(struct seq_file *seq, void *v)
2850         __releases(addrconf_hash_lock)
2851 {
2852         read_unlock_bh(&addrconf_hash_lock);
2853 }
2854
2855 static int if6_seq_show(struct seq_file *seq, void *v)
2856 {
2857         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2858         seq_printf(seq,
2859                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2860                    NIP6(ifp->addr),
2861                    ifp->idev->dev->ifindex,
2862                    ifp->prefix_len,
2863                    ifp->scope,
2864                    ifp->flags,
2865                    ifp->idev->dev->name);
2866         return 0;
2867 }
2868
2869 static const struct seq_operations if6_seq_ops = {
2870         .start  = if6_seq_start,
2871         .next   = if6_seq_next,
2872         .show   = if6_seq_show,
2873         .stop   = if6_seq_stop,
2874 };
2875
2876 static int if6_seq_open(struct inode *inode, struct file *file)
2877 {
2878         return seq_open_net(inode, file, &if6_seq_ops,
2879                             sizeof(struct if6_iter_state));
2880 }
2881
2882 static const struct file_operations if6_fops = {
2883         .owner          = THIS_MODULE,
2884         .open           = if6_seq_open,
2885         .read           = seq_read,
2886         .llseek         = seq_lseek,
2887         .release        = seq_release_net,
2888 };
2889
2890 static int if6_proc_net_init(struct net *net)
2891 {
2892         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2893                 return -ENOMEM;
2894         return 0;
2895 }
2896
2897 static void if6_proc_net_exit(struct net *net)
2898 {
2899        proc_net_remove(net, "if_inet6");
2900 }
2901
2902 static struct pernet_operations if6_proc_net_ops = {
2903        .init = if6_proc_net_init,
2904        .exit = if6_proc_net_exit,
2905 };
2906
2907 int __init if6_proc_init(void)
2908 {
2909         return register_pernet_subsys(&if6_proc_net_ops);
2910 }
2911
2912 void if6_proc_exit(void)
2913 {
2914         unregister_pernet_subsys(&if6_proc_net_ops);
2915 }
2916 #endif  /* CONFIG_PROC_FS */
2917
2918 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2919 /* Check if address is a home address configured on any interface. */
2920 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2921 {
2922         int ret = 0;
2923         struct inet6_ifaddr * ifp;
2924         u8 hash = ipv6_addr_hash(addr);
2925         read_lock_bh(&addrconf_hash_lock);
2926         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2927                 if (!net_eq(dev_net(ifp->idev->dev), net))
2928                         continue;
2929                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2930                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2931                         ret = 1;
2932                         break;
2933                 }
2934         }
2935         read_unlock_bh(&addrconf_hash_lock);
2936         return ret;
2937 }
2938 #endif
2939
2940 /*
2941  *      Periodic address status verification
2942  */
2943
2944 static void addrconf_verify(unsigned long foo)
2945 {
2946         struct inet6_ifaddr *ifp;
2947         unsigned long now, next;
2948         int i;
2949
2950         spin_lock_bh(&addrconf_verify_lock);
2951         now = jiffies;
2952         next = now + ADDR_CHECK_FREQUENCY;
2953
2954         del_timer(&addr_chk_timer);
2955
2956         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2957
2958 restart:
2959                 read_lock(&addrconf_hash_lock);
2960                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2961                         unsigned long age;
2962 #ifdef CONFIG_IPV6_PRIVACY
2963                         unsigned long regen_advance;
2964 #endif
2965
2966                         if (ifp->flags & IFA_F_PERMANENT)
2967                                 continue;
2968
2969                         spin_lock(&ifp->lock);
2970                         age = (now - ifp->tstamp) / HZ;
2971
2972 #ifdef CONFIG_IPV6_PRIVACY
2973                         regen_advance = ifp->idev->cnf.regen_max_retry *
2974                                         ifp->idev->cnf.dad_transmits *
2975                                         ifp->idev->nd_parms->retrans_time / HZ;
2976 #endif
2977
2978                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2979                             age >= ifp->valid_lft) {
2980                                 spin_unlock(&ifp->lock);
2981                                 in6_ifa_hold(ifp);
2982                                 read_unlock(&addrconf_hash_lock);
2983                                 ipv6_del_addr(ifp);
2984                                 goto restart;
2985                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2986                                 spin_unlock(&ifp->lock);
2987                                 continue;
2988                         } else if (age >= ifp->prefered_lft) {
2989                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2990                                 int deprecate = 0;
2991
2992                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2993                                         deprecate = 1;
2994                                         ifp->flags |= IFA_F_DEPRECATED;
2995                                 }
2996
2997                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2998                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2999
3000                                 spin_unlock(&ifp->lock);
3001
3002                                 if (deprecate) {
3003                                         in6_ifa_hold(ifp);
3004                                         read_unlock(&addrconf_hash_lock);
3005
3006                                         ipv6_ifa_notify(0, ifp);
3007                                         in6_ifa_put(ifp);
3008                                         goto restart;
3009                                 }
3010 #ifdef CONFIG_IPV6_PRIVACY
3011                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3012                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3013                                 if (age >= ifp->prefered_lft - regen_advance) {
3014                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3015                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3016                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3017                                         if (!ifp->regen_count && ifpub) {
3018                                                 ifp->regen_count++;
3019                                                 in6_ifa_hold(ifp);
3020                                                 in6_ifa_hold(ifpub);
3021                                                 spin_unlock(&ifp->lock);
3022                                                 read_unlock(&addrconf_hash_lock);
3023                                                 spin_lock(&ifpub->lock);
3024                                                 ifpub->regen_count = 0;
3025                                                 spin_unlock(&ifpub->lock);
3026                                                 ipv6_create_tempaddr(ifpub, ifp);
3027                                                 in6_ifa_put(ifpub);
3028                                                 in6_ifa_put(ifp);
3029                                                 goto restart;
3030                                         }
3031                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3032                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3033                                 spin_unlock(&ifp->lock);
3034 #endif
3035                         } else {
3036                                 /* ifp->prefered_lft <= ifp->valid_lft */
3037                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3038                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3039                                 spin_unlock(&ifp->lock);
3040                         }
3041                 }
3042                 read_unlock(&addrconf_hash_lock);
3043         }
3044
3045         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3046         add_timer(&addr_chk_timer);
3047         spin_unlock_bh(&addrconf_verify_lock);
3048 }
3049
3050 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3051 {
3052         struct in6_addr *pfx = NULL;
3053
3054         if (addr)
3055                 pfx = nla_data(addr);
3056
3057         if (local) {
3058                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3059                         pfx = NULL;
3060                 else
3061                         pfx = nla_data(local);
3062         }
3063
3064         return pfx;
3065 }
3066
3067 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3068         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3069         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3070         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3071 };
3072
3073 static int
3074 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3075 {
3076         struct net *net = sock_net(skb->sk);
3077         struct ifaddrmsg *ifm;
3078         struct nlattr *tb[IFA_MAX+1];
3079         struct in6_addr *pfx;
3080         int err;
3081
3082         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3083         if (err < 0)
3084                 return err;
3085
3086         ifm = nlmsg_data(nlh);
3087         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3088         if (pfx == NULL)
3089                 return -EINVAL;
3090
3091         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3092 }
3093
3094 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3095                              u32 prefered_lft, u32 valid_lft)
3096 {
3097         u32 flags = RTF_EXPIRES;
3098
3099         if (!valid_lft || (prefered_lft > valid_lft))
3100                 return -EINVAL;
3101
3102         if (valid_lft == INFINITY_LIFE_TIME) {
3103                 ifa_flags |= IFA_F_PERMANENT;
3104                 flags = 0;
3105         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3106                 valid_lft = 0x7FFFFFFF/HZ;
3107
3108         if (prefered_lft == 0)
3109                 ifa_flags |= IFA_F_DEPRECATED;
3110         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3111                  (prefered_lft != INFINITY_LIFE_TIME))
3112                 prefered_lft = 0x7FFFFFFF/HZ;
3113
3114         spin_lock_bh(&ifp->lock);
3115         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3116         ifp->tstamp = jiffies;
3117         ifp->valid_lft = valid_lft;
3118         ifp->prefered_lft = prefered_lft;
3119
3120         spin_unlock_bh(&ifp->lock);
3121         if (!(ifp->flags&IFA_F_TENTATIVE))
3122                 ipv6_ifa_notify(0, ifp);
3123
3124         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3125                               jiffies_to_clock_t(valid_lft * HZ), flags);
3126         addrconf_verify(0);
3127
3128         return 0;
3129 }
3130
3131 static int
3132 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3133 {
3134         struct net *net = sock_net(skb->sk);
3135         struct ifaddrmsg *ifm;
3136         struct nlattr *tb[IFA_MAX+1];
3137         struct in6_addr *pfx;
3138         struct inet6_ifaddr *ifa;
3139         struct net_device *dev;
3140         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3141         u8 ifa_flags;
3142         int err;
3143
3144         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3145         if (err < 0)
3146                 return err;
3147
3148         ifm = nlmsg_data(nlh);
3149         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3150         if (pfx == NULL)
3151                 return -EINVAL;
3152
3153         if (tb[IFA_CACHEINFO]) {
3154                 struct ifa_cacheinfo *ci;
3155
3156                 ci = nla_data(tb[IFA_CACHEINFO]);
3157                 valid_lft = ci->ifa_valid;
3158                 preferred_lft = ci->ifa_prefered;
3159         } else {
3160                 preferred_lft = INFINITY_LIFE_TIME;
3161                 valid_lft = INFINITY_LIFE_TIME;
3162         }
3163
3164         dev =  __dev_get_by_index(net, ifm->ifa_index);
3165         if (dev == NULL)
3166                 return -ENODEV;
3167
3168         /* We ignore other flags so far. */
3169         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3170
3171         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3172         if (ifa == NULL) {
3173                 /*
3174                  * It would be best to check for !NLM_F_CREATE here but
3175                  * userspace alreay relies on not having to provide this.
3176                  */
3177                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3178                                       ifm->ifa_prefixlen, ifa_flags,
3179                                       preferred_lft, valid_lft);
3180         }
3181
3182         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3183             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3184                 err = -EEXIST;
3185         else
3186                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3187
3188         in6_ifa_put(ifa);
3189
3190         return err;
3191 }
3192
3193 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3194                           u8 scope, int ifindex)
3195 {
3196         struct ifaddrmsg *ifm;
3197
3198         ifm = nlmsg_data(nlh);
3199         ifm->ifa_family = AF_INET6;
3200         ifm->ifa_prefixlen = prefixlen;
3201         ifm->ifa_flags = flags;
3202         ifm->ifa_scope = scope;
3203         ifm->ifa_index = ifindex;
3204 }
3205
3206 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3207                          unsigned long tstamp, u32 preferred, u32 valid)
3208 {
3209         struct ifa_cacheinfo ci;
3210
3211         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3212                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3213         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3214                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3215         ci.ifa_prefered = preferred;
3216         ci.ifa_valid = valid;
3217
3218         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3219 }
3220
3221 static inline int rt_scope(int ifa_scope)
3222 {
3223         if (ifa_scope & IFA_HOST)
3224                 return RT_SCOPE_HOST;
3225         else if (ifa_scope & IFA_LINK)
3226                 return RT_SCOPE_LINK;
3227         else if (ifa_scope & IFA_SITE)
3228                 return RT_SCOPE_SITE;
3229         else
3230                 return RT_SCOPE_UNIVERSE;
3231 }
3232
3233 static inline int inet6_ifaddr_msgsize(void)
3234 {
3235         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3236                + nla_total_size(16) /* IFA_ADDRESS */
3237                + nla_total_size(sizeof(struct ifa_cacheinfo));
3238 }
3239
3240 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3241                              u32 pid, u32 seq, int event, unsigned int flags)
3242 {
3243         struct nlmsghdr  *nlh;
3244         u32 preferred, valid;
3245
3246         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3247         if (nlh == NULL)
3248                 return -EMSGSIZE;
3249
3250         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3251                       ifa->idev->dev->ifindex);
3252
3253         if (!(ifa->flags&IFA_F_PERMANENT)) {
3254                 preferred = ifa->prefered_lft;
3255                 valid = ifa->valid_lft;
3256                 if (preferred != INFINITY_LIFE_TIME) {
3257                         long tval = (jiffies - ifa->tstamp)/HZ;
3258                         preferred -= tval;
3259                         if (valid != INFINITY_LIFE_TIME)
3260                                 valid -= tval;
3261                 }
3262         } else {
3263                 preferred = INFINITY_LIFE_TIME;
3264                 valid = INFINITY_LIFE_TIME;
3265         }
3266
3267         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3268             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3269                 nlmsg_cancel(skb, nlh);
3270                 return -EMSGSIZE;
3271         }
3272
3273         return nlmsg_end(skb, nlh);
3274 }
3275
3276 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3277                                 u32 pid, u32 seq, int event, u16 flags)
3278 {
3279         struct nlmsghdr  *nlh;
3280         u8 scope = RT_SCOPE_UNIVERSE;
3281         int ifindex = ifmca->idev->dev->ifindex;
3282
3283         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3284                 scope = RT_SCOPE_SITE;
3285
3286         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3287         if (nlh == NULL)
3288                 return -EMSGSIZE;
3289
3290         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3291         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3292             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3293                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3294                 nlmsg_cancel(skb, nlh);
3295                 return -EMSGSIZE;
3296         }
3297
3298         return nlmsg_end(skb, nlh);
3299 }
3300
3301 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3302                                 u32 pid, u32 seq, int event, unsigned int flags)
3303 {
3304         struct nlmsghdr  *nlh;
3305         u8 scope = RT_SCOPE_UNIVERSE;
3306         int ifindex = ifaca->aca_idev->dev->ifindex;
3307
3308         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3309                 scope = RT_SCOPE_SITE;
3310
3311         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3312         if (nlh == NULL)
3313                 return -EMSGSIZE;
3314
3315         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3316         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3317             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3318                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3319                 nlmsg_cancel(skb, nlh);
3320                 return -EMSGSIZE;
3321         }
3322
3323         return nlmsg_end(skb, nlh);
3324 }
3325
3326 enum addr_type_t
3327 {
3328         UNICAST_ADDR,
3329         MULTICAST_ADDR,
3330         ANYCAST_ADDR,
3331 };
3332
3333 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3334                            enum addr_type_t type)
3335 {
3336         int idx, ip_idx;
3337         int s_idx, s_ip_idx;
3338         int err = 1;
3339         struct net_device *dev;
3340         struct inet6_dev *idev = NULL;
3341         struct inet6_ifaddr *ifa;
3342         struct ifmcaddr6 *ifmca;
3343         struct ifacaddr6 *ifaca;
3344         struct net *net = sock_net(skb->sk);
3345
3346         s_idx = cb->args[0];
3347         s_ip_idx = ip_idx = cb->args[1];
3348
3349         idx = 0;
3350         for_each_netdev(net, dev) {
3351                 if (idx < s_idx)
3352                         goto cont;
3353                 if (idx > s_idx)
3354                         s_ip_idx = 0;
3355                 ip_idx = 0;
3356                 if ((idev = in6_dev_get(dev)) == NULL)
3357                         goto cont;
3358                 read_lock_bh(&idev->lock);
3359                 switch (type) {
3360                 case UNICAST_ADDR:
3361                         /* unicast address incl. temp addr */
3362                         for (ifa = idev->addr_list; ifa;
3363                              ifa = ifa->if_next, ip_idx++) {
3364                                 if (ip_idx < s_ip_idx)
3365                                         continue;
3366                                 err = inet6_fill_ifaddr(skb, ifa,
3367                                                         NETLINK_CB(cb->skb).pid,
3368                                                         cb->nlh->nlmsg_seq,
3369                                                         RTM_NEWADDR,
3370                                                         NLM_F_MULTI);
3371                         }
3372                         break;
3373                 case MULTICAST_ADDR:
3374                         /* multicast address */
3375                         for (ifmca = idev->mc_list; ifmca;
3376                              ifmca = ifmca->next, ip_idx++) {
3377                                 if (ip_idx < s_ip_idx)
3378                                         continue;
3379                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3380                                                           NETLINK_CB(cb->skb).pid,
3381                                                           cb->nlh->nlmsg_seq,
3382                                                           RTM_GETMULTICAST,
3383                                                           NLM_F_MULTI);
3384                         }
3385                         break;
3386                 case ANYCAST_ADDR:
3387                         /* anycast address */
3388                         for (ifaca = idev->ac_list; ifaca;
3389                              ifaca = ifaca->aca_next, ip_idx++) {
3390                                 if (ip_idx < s_ip_idx)
3391                                         continue;
3392                                 err = inet6_fill_ifacaddr(skb, ifaca,
3393                                                           NETLINK_CB(cb->skb).pid,
3394                                                           cb->nlh->nlmsg_seq,
3395                                                           RTM_GETANYCAST,
3396                                                           NLM_F_MULTI);
3397                         }
3398                         break;
3399                 default:
3400                         break;
3401                 }
3402                 read_unlock_bh(&idev->lock);
3403                 in6_dev_put(idev);
3404
3405                 if (err <= 0)
3406                         break;
3407 cont:
3408                 idx++;
3409         }
3410         cb->args[0] = idx;
3411         cb->args[1] = ip_idx;
3412         return skb->len;
3413 }
3414
3415 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3416 {
3417         enum addr_type_t type = UNICAST_ADDR;
3418
3419         return inet6_dump_addr(skb, cb, type);
3420 }
3421
3422 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3423 {
3424         enum addr_type_t type = MULTICAST_ADDR;
3425
3426         return inet6_dump_addr(skb, cb, type);
3427 }
3428
3429
3430 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3431 {
3432         enum addr_type_t type = ANYCAST_ADDR;
3433
3434         return inet6_dump_addr(skb, cb, type);
3435 }
3436
3437 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3438                              void *arg)
3439 {
3440         struct net *net = sock_net(in_skb->sk);
3441         struct ifaddrmsg *ifm;
3442         struct nlattr *tb[IFA_MAX+1];
3443         struct in6_addr *addr = NULL;
3444         struct net_device *dev = NULL;
3445         struct inet6_ifaddr *ifa;
3446         struct sk_buff *skb;
3447         int err;
3448
3449         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3450         if (err < 0)
3451                 goto errout;
3452
3453         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3454         if (addr == NULL) {
3455                 err = -EINVAL;
3456                 goto errout;
3457         }
3458
3459         ifm = nlmsg_data(nlh);
3460         if (ifm->ifa_index)
3461                 dev = __dev_get_by_index(net, ifm->ifa_index);
3462
3463         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3464                 err = -EADDRNOTAVAIL;
3465                 goto errout;
3466         }
3467
3468         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3469                 err = -ENOBUFS;
3470                 goto errout_ifa;
3471         }
3472
3473         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3474                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3475         if (err < 0) {
3476                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3477                 WARN_ON(err == -EMSGSIZE);
3478                 kfree_skb(skb);
3479                 goto errout_ifa;
3480         }
3481         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3482 errout_ifa:
3483         in6_ifa_put(ifa);
3484 errout:
3485         return err;
3486 }
3487
3488 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3489 {
3490         struct sk_buff *skb;
3491         struct net *net = dev_net(ifa->idev->dev);
3492         int err = -ENOBUFS;
3493
3494         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3495         if (skb == NULL)
3496                 goto errout;
3497
3498         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3499         if (err < 0) {
3500                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3501                 WARN_ON(err == -EMSGSIZE);
3502                 kfree_skb(skb);
3503                 goto errout;
3504         }
3505         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3506 errout:
3507         if (err < 0)
3508                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3509 }
3510
3511 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3512                                 __s32 *array, int bytes)
3513 {
3514         BUG_ON(bytes < (DEVCONF_MAX * 4));
3515
3516         memset(array, 0, bytes);
3517         array[DEVCONF_FORWARDING] = cnf->forwarding;
3518         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3519         array[DEVCONF_MTU6] = cnf->mtu6;
3520         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3521         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3522         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3523         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3524         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3525         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3526         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3527         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3528 #ifdef CONFIG_IPV6_PRIVACY
3529         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3530         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3531         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3532         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3533         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3534 #endif
3535         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3536         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3537         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3538 #ifdef CONFIG_IPV6_ROUTER_PREF
3539         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3540         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3541 #ifdef CONFIG_IPV6_ROUTE_INFO
3542         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3543 #endif
3544 #endif
3545         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3546         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3547 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3548         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3549 #endif
3550 #ifdef CONFIG_IPV6_MROUTE
3551         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3552 #endif
3553 }
3554
3555 static inline size_t inet6_if_nlmsg_size(void)
3556 {
3557         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3558                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3559                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3560                + nla_total_size(4) /* IFLA_MTU */
3561                + nla_total_size(4) /* IFLA_LINK */
3562                + nla_total_size( /* IFLA_PROTINFO */
3563                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3564                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3565                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3566                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3567                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3568                  );
3569 }
3570
3571 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3572                                       int bytes)
3573 {
3574         int i;
3575         int pad = bytes - sizeof(u64) * items;
3576         BUG_ON(pad < 0);
3577
3578         /* Use put_unaligned() because stats may not be aligned for u64. */
3579         put_unaligned(items, &stats[0]);
3580         for (i = 1; i < items; i++)
3581                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3582
3583         memset(&stats[items], 0, pad);
3584 }
3585
3586 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3587                              int bytes)
3588 {
3589         switch(attrtype) {
3590         case IFLA_INET6_STATS:
3591                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3592                 break;
3593         case IFLA_INET6_ICMP6STATS:
3594                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3595                 break;
3596         }
3597 }
3598
3599 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3600                              u32 pid, u32 seq, int event, unsigned int flags)
3601 {
3602         struct net_device *dev = idev->dev;
3603         struct nlattr *nla;
3604         struct ifinfomsg *hdr;
3605         struct nlmsghdr *nlh;
3606         void *protoinfo;
3607         struct ifla_cacheinfo ci;
3608
3609         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3610         if (nlh == NULL)
3611                 return -EMSGSIZE;
3612
3613         hdr = nlmsg_data(nlh);
3614         hdr->ifi_family = AF_INET6;
3615         hdr->__ifi_pad = 0;
3616         hdr->ifi_type = dev->type;
3617         hdr->ifi_index = dev->ifindex;
3618         hdr->ifi_flags = dev_get_flags(dev);
3619         hdr->ifi_change = 0;
3620
3621         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3622
3623         if (dev->addr_len)
3624                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3625
3626         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3627         if (dev->ifindex != dev->iflink)
3628                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3629
3630         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3631         if (protoinfo == NULL)
3632                 goto nla_put_failure;
3633
3634         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3635
3636         ci.max_reasm_len = IPV6_MAXPLEN;
3637         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3638                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3639         ci.reachable_time = idev->nd_parms->reachable_time;
3640         ci.retrans_time = idev->nd_parms->retrans_time;
3641         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3642
3643         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3644         if (nla == NULL)
3645                 goto nla_put_failure;
3646         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3647
3648         /* XXX - MC not implemented */
3649
3650         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3651         if (nla == NULL)
3652                 goto nla_put_failure;
3653         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3654
3655         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3656         if (nla == NULL)
3657                 goto nla_put_failure;
3658         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3659
3660         nla_nest_end(skb, protoinfo);
3661         return nlmsg_end(skb, nlh);
3662
3663 nla_put_failure:
3664         nlmsg_cancel(skb, nlh);
3665         return -EMSGSIZE;
3666 }
3667
3668 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3669 {
3670         struct net *net = sock_net(skb->sk);
3671         int idx, err;
3672         int s_idx = cb->args[0];
3673         struct net_device *dev;
3674         struct inet6_dev *idev;
3675
3676         read_lock(&dev_base_lock);
3677         idx = 0;
3678         for_each_netdev(net, dev) {
3679                 if (idx < s_idx)
3680                         goto cont;
3681                 if ((idev = in6_dev_get(dev)) == NULL)
3682                         goto cont;
3683                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3684                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3685                 in6_dev_put(idev);
3686                 if (err <= 0)
3687                         break;
3688 cont:
3689                 idx++;
3690         }
3691         read_unlock(&dev_base_lock);
3692         cb->args[0] = idx;
3693
3694         return skb->len;
3695 }
3696
3697 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3698 {
3699         struct sk_buff *skb;
3700         struct net *net = dev_net(idev->dev);
3701         int err = -ENOBUFS;
3702
3703         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3704         if (skb == NULL)
3705                 goto errout;
3706
3707         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3708         if (err < 0) {
3709                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3710                 WARN_ON(err == -EMSGSIZE);
3711                 kfree_skb(skb);
3712                 goto errout;
3713         }
3714         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3715 errout:
3716         if (err < 0)
3717                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3718 }
3719
3720 static inline size_t inet6_prefix_nlmsg_size(void)
3721 {
3722         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3723                + nla_total_size(sizeof(struct in6_addr))
3724                + nla_total_size(sizeof(struct prefix_cacheinfo));
3725 }
3726
3727 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3728                              struct prefix_info *pinfo, u32 pid, u32 seq,
3729                              int event, unsigned int flags)
3730 {
3731         struct prefixmsg *pmsg;
3732         struct nlmsghdr *nlh;
3733         struct prefix_cacheinfo ci;
3734
3735         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3736         if (nlh == NULL)
3737                 return -EMSGSIZE;
3738
3739         pmsg = nlmsg_data(nlh);
3740         pmsg->prefix_family = AF_INET6;
3741         pmsg->prefix_pad1 = 0;
3742         pmsg->prefix_pad2 = 0;
3743         pmsg->prefix_ifindex = idev->dev->ifindex;
3744         pmsg->prefix_len = pinfo->prefix_len;
3745         pmsg->prefix_type = pinfo->type;
3746         pmsg->prefix_pad3 = 0;
3747         pmsg->prefix_flags = 0;
3748         if (pinfo->onlink)
3749                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3750         if (pinfo->autoconf)
3751                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3752
3753         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3754
3755         ci.preferred_time = ntohl(pinfo->prefered);
3756         ci.valid_time = ntohl(pinfo->valid);
3757         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3758
3759         return nlmsg_end(skb, nlh);
3760
3761 nla_put_failure:
3762         nlmsg_cancel(skb, nlh);
3763         return -EMSGSIZE;
3764 }
3765
3766 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3767                          struct prefix_info *pinfo)
3768 {
3769         struct sk_buff *skb;
3770         struct net *net = dev_net(idev->dev);
3771         int err = -ENOBUFS;
3772
3773         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3774         if (skb == NULL)
3775                 goto errout;
3776
3777         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3778         if (err < 0) {
3779                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3780                 WARN_ON(err == -EMSGSIZE);
3781                 kfree_skb(skb);
3782                 goto errout;
3783         }
3784         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3785 errout:
3786         if (err < 0)
3787                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3788 }
3789
3790 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3791 {
3792         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3793
3794         switch (event) {
3795         case RTM_NEWADDR:
3796                 /*
3797                  * If the address was optimistic
3798                  * we inserted the route at the start of
3799                  * our DAD process, so we don't need
3800                  * to do it again
3801                  */
3802                 if (!(ifp->rt->rt6i_node))
3803                         ip6_ins_rt(ifp->rt);
3804                 if (ifp->idev->cnf.forwarding)
3805                         addrconf_join_anycast(ifp);
3806                 break;
3807         case RTM_DELADDR:
3808                 if (ifp->idev->cnf.forwarding)
3809                         addrconf_leave_anycast(ifp);
3810                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3811                 dst_hold(&ifp->rt->u.dst);
3812                 if (ip6_del_rt(ifp->rt))
3813                         dst_free(&ifp->rt->u.dst);
3814                 break;
3815         }
3816 }
3817
3818 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3819 {
3820         rcu_read_lock_bh();
3821         if (likely(ifp->idev->dead == 0))
3822                 __ipv6_ifa_notify(event, ifp);
3823         rcu_read_unlock_bh();
3824 }
3825
3826 #ifdef CONFIG_SYSCTL
3827
3828 static
3829 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3830                            void __user *buffer, size_t *lenp, loff_t *ppos)
3831 {
3832         int *valp = ctl->data;
3833         int val = *valp;
3834         int ret;
3835
3836         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3837
3838         if (write)
3839                 addrconf_fixup_forwarding(ctl, valp, val);
3840         return ret;
3841 }
3842
3843 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3844                                             int __user *name, int nlen,
3845                                             void __user *oldval,
3846                                             size_t __user *oldlenp,
3847                                             void __user *newval, size_t newlen)
3848 {
3849         int *valp = table->data;
3850         int val = *valp;
3851         int new;
3852
3853         if (!newval || !newlen)
3854                 return 0;
3855         if (newlen != sizeof(int))
3856                 return -EINVAL;
3857         if (get_user(new, (int __user *)newval))
3858                 return -EFAULT;
3859         if (new == *valp)
3860                 return 0;
3861         if (oldval && oldlenp) {
3862                 size_t len;
3863                 if (get_user(len, oldlenp))
3864                         return -EFAULT;
3865                 if (len) {
3866                         if (len > table->maxlen)
3867                                 len = table->maxlen;
3868                         if (copy_to_user(oldval, valp, len))
3869                                 return -EFAULT;
3870                         if (put_user(len, oldlenp))
3871                                 return -EFAULT;
3872                 }
3873         }
3874
3875         *valp = new;
3876         addrconf_fixup_forwarding(table, valp, val);
3877         return 1;
3878 }
3879
3880 static struct addrconf_sysctl_table
3881 {
3882         struct ctl_table_header *sysctl_header;
3883         ctl_table addrconf_vars[DEVCONF_MAX+1];
3884         char *dev_name;
3885 } addrconf_sysctl __read_mostly = {
3886         .sysctl_header = NULL,
3887         .addrconf_vars = {
3888                 {
3889                         .ctl_name       =       NET_IPV6_FORWARDING,
3890                         .procname       =       "forwarding",
3891                         .data           =       &ipv6_devconf.forwarding,
3892                         .maxlen         =       sizeof(int),
3893                         .mode           =       0644,
3894                         .proc_handler   =       &addrconf_sysctl_forward,
3895                         .strategy       =       &addrconf_sysctl_forward_strategy,
3896                 },
3897                 {
3898                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3899                         .procname       =       "hop_limit",
3900                         .data           =       &ipv6_devconf.hop_limit,
3901                         .maxlen         =       sizeof(int),
3902                         .mode           =       0644,
3903                         .proc_handler   =       proc_dointvec,
3904                 },
3905                 {
3906                         .ctl_name       =       NET_IPV6_MTU,
3907                         .procname       =       "mtu",
3908                         .data           =       &ipv6_devconf.mtu6,
3909                         .maxlen         =       sizeof(int),
3910                         .mode           =       0644,
3911                         .proc_handler   =       &proc_dointvec,
3912                 },
3913                 {
3914                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3915                         .procname       =       "accept_ra",
3916                         .data           =       &ipv6_devconf.accept_ra,
3917                         .maxlen         =       sizeof(int),
3918                         .mode           =       0644,
3919                         .proc_handler   =       &proc_dointvec,
3920                 },
3921                 {
3922                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3923                         .procname       =       "accept_redirects",
3924                         .data           =       &ipv6_devconf.accept_redirects,
3925                         .maxlen         =       sizeof(int),
3926                         .mode           =       0644,
3927                         .proc_handler   =       &proc_dointvec,
3928                 },
3929                 {
3930                         .ctl_name       =       NET_IPV6_AUTOCONF,
3931                         .procname       =       "autoconf",
3932                         .data           =       &ipv6_devconf.autoconf,
3933                         .maxlen         =       sizeof(int),
3934                         .mode           =       0644,
3935                         .proc_handler   =       &proc_dointvec,
3936                 },
3937                 {
3938                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3939                         .procname       =       "dad_transmits",
3940                         .data           =       &ipv6_devconf.dad_transmits,
3941                         .maxlen         =       sizeof(int),
3942                         .mode           =       0644,
3943                         .proc_handler   =       &proc_dointvec,
3944                 },
3945                 {
3946                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3947                         .procname       =       "router_solicitations",
3948                         .data           =       &ipv6_devconf.rtr_solicits,
3949                         .maxlen         =       sizeof(int),
3950                         .mode           =       0644,
3951                         .proc_handler   =       &proc_dointvec,
3952                 },
3953                 {
3954                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3955                         .procname       =       "router_solicitation_interval",
3956                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3957                         .maxlen         =       sizeof(int),
3958                         .mode           =       0644,
3959                         .proc_handler   =       &proc_dointvec_jiffies,
3960                         .strategy       =       &sysctl_jiffies,
3961                 },
3962                 {
3963                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3964                         .procname       =       "router_solicitation_delay",
3965                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3966                         .maxlen         =       sizeof(int),
3967                         .mode           =       0644,
3968                         .proc_handler   =       &proc_dointvec_jiffies,
3969                         .strategy       =       &sysctl_jiffies,
3970                 },
3971                 {
3972                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3973                         .procname       =       "force_mld_version",
3974                         .data           =       &ipv6_devconf.force_mld_version,
3975                         .maxlen         =       sizeof(int),
3976                         .mode           =       0644,
3977                         .proc_handler   =       &proc_dointvec,
3978                 },
3979 #ifdef CONFIG_IPV6_PRIVACY
3980                 {
3981                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3982                         .procname       =       "use_tempaddr",
3983                         .data           =       &ipv6_devconf.use_tempaddr,
3984                         .maxlen         =       sizeof(int),
3985                         .mode           =       0644,
3986                         .proc_handler   =       &proc_dointvec,
3987                 },
3988                 {
3989                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3990                         .procname       =       "temp_valid_lft",
3991                         .data           =       &ipv6_devconf.temp_valid_lft,
3992                         .maxlen         =       sizeof(int),
3993                         .mode           =       0644,
3994                         .proc_handler   =       &proc_dointvec,
3995                 },
3996                 {
3997                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3998                         .procname       =       "temp_prefered_lft",
3999                         .data           =       &ipv6_devconf.temp_prefered_lft,
4000                         .maxlen         =       sizeof(int),
4001                         .mode           =       0644,
4002                         .proc_handler   =       &proc_dointvec,
4003                 },
4004                 {
4005                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4006                         .procname       =       "regen_max_retry",
4007                         .data           =       &ipv6_devconf.regen_max_retry,
4008                         .maxlen         =       sizeof(int),
4009                         .mode           =       0644,
4010                         .proc_handler   =       &proc_dointvec,
4011                 },
4012                 {
4013                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4014                         .procname       =       "max_desync_factor",
4015                         .data           =       &ipv6_devconf.max_desync_factor,
4016                         .maxlen         =       sizeof(int),
4017                         .mode           =       0644,
4018                         .proc_handler   =       &proc_dointvec,
4019                 },
4020 #endif
4021                 {
4022                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4023                         .procname       =       "max_addresses",
4024                         .data           =       &ipv6_devconf.max_addresses,
4025                         .maxlen         =       sizeof(int),
4026                         .mode           =       0644,
4027                         .proc_handler   =       &proc_dointvec,
4028                 },
4029                 {
4030                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4031                         .procname       =       "accept_ra_defrtr",
4032                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4033                         .maxlen         =       sizeof(int),
4034                         .mode           =       0644,
4035                         .proc_handler   =       &proc_dointvec,
4036                 },
4037                 {
4038                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4039                         .procname       =       "accept_ra_pinfo",
4040                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4041                         .maxlen         =       sizeof(int),
4042                         .mode           =       0644,
4043                         .proc_handler   =       &proc_dointvec,
4044                 },
4045 #ifdef CONFIG_IPV6_ROUTER_PREF
4046                 {
4047                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4048                         .procname       =       "accept_ra_rtr_pref",
4049                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4050                         .maxlen         =       sizeof(int),
4051                         .mode           =       0644,
4052                         .proc_handler   =       &proc_dointvec,
4053                 },
4054                 {
4055                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4056                         .procname       =       "router_probe_interval",
4057                         .data           =       &ipv6_devconf.rtr_probe_interval,
4058                         .maxlen         =       sizeof(int),
4059                         .mode           =       0644,
4060                         .proc_handler   =       &proc_dointvec_jiffies,
4061                         .strategy       =       &sysctl_jiffies,
4062                 },
4063 #ifdef CONFIG_IPV6_ROUTE_INFO
4064                 {
4065                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4066                         .procname       =       "accept_ra_rt_info_max_plen",
4067                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4068                         .maxlen         =       sizeof(int),
4069                         .mode           =       0644,
4070                         .proc_handler   =       &proc_dointvec,
4071                 },
4072 #endif
4073 #endif
4074                 {
4075                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4076                         .procname       =       "proxy_ndp",
4077                         .data           =       &ipv6_devconf.proxy_ndp,
4078                         .maxlen         =       sizeof(int),
4079                         .mode           =       0644,
4080                         .proc_handler   =       &proc_dointvec,
4081                 },
4082                 {
4083                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4084                         .procname       =       "accept_source_route",
4085                         .data           =       &ipv6_devconf.accept_source_route,
4086                         .maxlen         =       sizeof(int),
4087                         .mode           =       0644,
4088                         .proc_handler   =       &proc_dointvec,
4089                 },
4090 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4091                 {
4092                         .ctl_name       =       CTL_UNNUMBERED,
4093                         .procname       =       "optimistic_dad",
4094                         .data           =       &ipv6_devconf.optimistic_dad,
4095                         .maxlen         =       sizeof(int),
4096                         .mode           =       0644,
4097                         .proc_handler   =       &proc_dointvec,
4098
4099                 },
4100 #endif
4101 #ifdef CONFIG_IPV6_MROUTE
4102                 {
4103                         .ctl_name       =       CTL_UNNUMBERED,
4104                         .procname       =       "mc_forwarding",
4105                         .data           =       &ipv6_devconf.mc_forwarding,
4106                         .maxlen         =       sizeof(int),
4107                         .mode           =       0644,
4108                         .proc_handler   =       &proc_dointvec,
4109                 },
4110 #endif
4111                 {
4112                         .ctl_name       =       0,      /* sentinel */
4113                 }
4114         },
4115 };
4116
4117 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4118                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4119 {
4120         int i;
4121         struct addrconf_sysctl_table *t;
4122
4123 #define ADDRCONF_CTL_PATH_DEV   3
4124
4125         struct ctl_path addrconf_ctl_path[] = {
4126                 { .procname = "net", .ctl_name = CTL_NET, },
4127                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4128                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4129                 { /* to be set */ },
4130                 { },
4131         };
4132
4133
4134         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4135         if (t == NULL)
4136                 goto out;
4137
4138         for (i=0; t->addrconf_vars[i].data; i++) {
4139                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4140                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4141                 t->addrconf_vars[i].extra2 = net;
4142         }
4143
4144         /*
4145          * Make a copy of dev_name, because '.procname' is regarded as const
4146          * by sysctl and we wouldn't want anyone to change it under our feet
4147          * (see SIOCSIFNAME).
4148          */
4149         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4150         if (!t->dev_name)
4151                 goto free;
4152
4153         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4154         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4155
4156         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4157                         t->addrconf_vars);
4158         if (t->sysctl_header == NULL)
4159                 goto free_procname;
4160
4161         p->sysctl = t;
4162         return 0;
4163
4164 free_procname:
4165         kfree(t->dev_name);
4166 free:
4167         kfree(t);
4168 out:
4169         return -ENOBUFS;
4170 }
4171
4172 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4173 {
4174         struct addrconf_sysctl_table *t;
4175
4176         if (p->sysctl == NULL)
4177                 return;
4178
4179         t = p->sysctl;
4180         p->sysctl = NULL;
4181         unregister_sysctl_table(t->sysctl_header);
4182         kfree(t->dev_name);
4183         kfree(t);
4184 }
4185
4186 static void addrconf_sysctl_register(struct inet6_dev *idev)
4187 {
4188         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4189                               NET_IPV6_NEIGH, "ipv6",
4190                               &ndisc_ifinfo_sysctl_change,
4191                               NULL);
4192         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4193                         idev->dev->ifindex, idev, &idev->cnf);
4194 }
4195
4196 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4197 {
4198         __addrconf_sysctl_unregister(&idev->cnf);
4199         neigh_sysctl_unregister(idev->nd_parms);
4200 }
4201
4202
4203 #endif
4204
4205 static int addrconf_init_net(struct net *net)
4206 {
4207         int err;
4208         struct ipv6_devconf *all, *dflt;
4209
4210         err = -ENOMEM;
4211         all = &ipv6_devconf;
4212         dflt = &ipv6_devconf_dflt;
4213
4214         if (net != &init_net) {
4215                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4216                 if (all == NULL)
4217                         goto err_alloc_all;
4218
4219                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4220                 if (dflt == NULL)
4221                         goto err_alloc_dflt;
4222         }
4223
4224         net->ipv6.devconf_all = all;
4225         net->ipv6.devconf_dflt = dflt;
4226
4227 #ifdef CONFIG_SYSCTL
4228         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4229                         NULL, all);
4230         if (err < 0)
4231                 goto err_reg_all;
4232
4233         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4234                         NULL, dflt);
4235         if (err < 0)
4236                 goto err_reg_dflt;
4237 #endif
4238         return 0;
4239
4240 #ifdef CONFIG_SYSCTL
4241 err_reg_dflt:
4242         __addrconf_sysctl_unregister(all);
4243 err_reg_all:
4244         kfree(dflt);
4245 #endif
4246 err_alloc_dflt:
4247         kfree(all);
4248 err_alloc_all:
4249         return err;
4250 }
4251
4252 static void addrconf_exit_net(struct net *net)
4253 {
4254 #ifdef CONFIG_SYSCTL
4255         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4256         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4257 #endif
4258         if (net != &init_net) {
4259                 kfree(net->ipv6.devconf_dflt);
4260                 kfree(net->ipv6.devconf_all);
4261         }
4262 }
4263
4264 static struct pernet_operations addrconf_ops = {
4265         .init = addrconf_init_net,
4266         .exit = addrconf_exit_net,
4267 };
4268
4269 /*
4270  *      Device notifier
4271  */
4272
4273 int register_inet6addr_notifier(struct notifier_block *nb)
4274 {
4275         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4276 }
4277
4278 EXPORT_SYMBOL(register_inet6addr_notifier);
4279
4280 int unregister_inet6addr_notifier(struct notifier_block *nb)
4281 {
4282         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4283 }
4284
4285 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4286
4287
4288 static int addrconf_net_init(struct net *net)
4289 {
4290         return 0;
4291 }
4292
4293 static void addrconf_net_exit(struct net *net)
4294 {
4295         struct net_device *dev;
4296
4297         rtnl_lock();
4298         /* clean dev list */
4299         for_each_netdev(net, dev) {
4300                 if (__in6_dev_get(dev) == NULL)
4301                         continue;
4302                 addrconf_ifdown(dev, 1);
4303         }
4304         addrconf_ifdown(net->loopback_dev, 2);
4305         rtnl_unlock();
4306 }
4307
4308 static struct pernet_operations addrconf_net_ops = {
4309         .init = addrconf_net_init,
4310         .exit = addrconf_net_exit,
4311 };
4312
4313 /*
4314  *      Init / cleanup code
4315  */
4316
4317 int __init addrconf_init(void)
4318 {
4319         int err;
4320
4321         if ((err = ipv6_addr_label_init()) < 0) {
4322                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4323                         err);
4324                 return err;
4325         }
4326
4327         register_pernet_subsys(&addrconf_ops);
4328
4329         /* The addrconf netdev notifier requires that loopback_dev
4330          * has it's ipv6 private information allocated and setup
4331          * before it can bring up and give link-local addresses
4332          * to other devices which are up.
4333          *
4334          * Unfortunately, loopback_dev is not necessarily the first
4335          * entry in the global dev_base list of net devices.  In fact,
4336          * it is likely to be the very last entry on that list.
4337          * So this causes the notifier registry below to try and
4338          * give link-local addresses to all devices besides loopback_dev
4339          * first, then loopback_dev, which cases all the non-loopback_dev
4340          * devices to fail to get a link-local address.
4341          *
4342          * So, as a temporary fix, allocate the ipv6 structure for
4343          * loopback_dev first by hand.
4344          * Longer term, all of the dependencies ipv6 has upon the loopback
4345          * device and it being up should be removed.
4346          */
4347         rtnl_lock();
4348         if (!ipv6_add_dev(init_net.loopback_dev))
4349                 err = -ENOMEM;
4350         rtnl_unlock();
4351         if (err)
4352                 goto errlo;
4353
4354         err = register_pernet_device(&addrconf_net_ops);
4355         if (err)
4356                 return err;
4357
4358         register_netdevice_notifier(&ipv6_dev_notf);
4359
4360         addrconf_verify(0);
4361
4362         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4363         if (err < 0)
4364                 goto errout;
4365
4366         /* Only the first call to __rtnl_register can fail */
4367         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4368         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4369         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4370         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4371         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4372
4373         ipv6_addr_label_rtnl_register();
4374
4375         return 0;
4376 errout:
4377         unregister_netdevice_notifier(&ipv6_dev_notf);
4378 errlo:
4379         unregister_pernet_subsys(&addrconf_ops);
4380
4381         return err;
4382 }
4383
4384 void addrconf_cleanup(void)
4385 {
4386         struct inet6_ifaddr *ifa;
4387         int i;
4388
4389         unregister_netdevice_notifier(&ipv6_dev_notf);
4390         unregister_pernet_device(&addrconf_net_ops);
4391
4392         unregister_pernet_subsys(&addrconf_ops);
4393
4394         rtnl_lock();
4395
4396         /*
4397          *      Check hash table.
4398          */
4399         write_lock_bh(&addrconf_hash_lock);
4400         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4401                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4402                         struct inet6_ifaddr *bifa;
4403
4404                         bifa = ifa;
4405                         ifa = ifa->lst_next;
4406                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4407                         /* Do not free it; something is wrong.
4408                            Now we can investigate it with debugger.
4409                          */
4410                 }
4411         }
4412         write_unlock_bh(&addrconf_hash_lock);
4413
4414         del_timer(&addr_chk_timer);
4415         rtnl_unlock();
4416
4417         unregister_pernet_subsys(&addrconf_net_ops);
4418 }