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

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #include <linux/errno.h>
  42 #include <linux/types.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/net.h>
  46 #include <linux/in6.h>
  47 #include <linux/netdevice.h>
  48 #include <linux/if_addr.h>
  49 #include <linux/if_arp.h>
  50 #include <linux/if_arcnet.h>
  51 #include <linux/if_infiniband.h>
  52 #include <linux/route.h>
  53 #include <linux/inetdevice.h>
  54 #include <linux/init.h>
  55 #ifdef CONFIG_SYSCTL
  56 #include <linux/sysctl.h>
  57 #endif
  58 #include <linux/capability.h>
  59 #include <linux/delay.h>
  60 #include <linux/notifier.h>
  61 #include <linux/string.h>
  62
  63 #include <net/net_namespace.h>
  64 #include <net/sock.h>
  65 #include <net/snmp.h>
  66
  67 #include <net/ipv6.h>
  68 #include <net/protocol.h>
  69 #include <net/ndisc.h>
  70 #include <net/ip6_route.h>
  71 #include <net/addrconf.h>
  72 #include <net/tcp.h>
  73 #include <net/ip.h>
  74 #include <net/netlink.h>
  75 #include <net/pkt_sched.h>
  76 #include <linux/if_tunnel.h>
  77 #include <linux/rtnetlink.h>
  78
  79 #ifdef CONFIG_IPV6_PRIVACY
  80 #include <linux/random.h>
  81 #endif
  82
  83 #include <asm/uaccess.h>
  84 #include <asm/unaligned.h>
  85
  86 #include <linux/proc_fs.h>
  87 #include <linux/seq_file.h>
  88
  89 /* Set to 3 to get tracing... */
  90 #define ACONF_DEBUG 2
  91
  92 #if ACONF_DEBUG >= 3
  93 #define ADBG(x) printk x
  94 #else
  95 #define ADBG(x)
  96 #endif
  97
  98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 100
 101 #ifdef CONFIG_SYSCTL
 102 static void addrconf_sysctl_register(struct inet6_dev *idev);
 103 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 104 #else
 105 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 106 {
 107 }
 108
 109 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 110 {
 111 }
 112 #endif
 113
 114 #ifdef CONFIG_IPV6_PRIVACY
 115 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 116 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 117 static void ipv6_regen_rndid(unsigned long data);
 118
 119 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 120 #endif
 121
 122 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 123 static int ipv6_count_addresses(struct inet6_dev *idev);
 124
 125 /*
 126  *      Configured unicast address hash table
 127  */
 128 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 129 static DEFINE_RWLOCK(addrconf_hash_lock);
 130
 131 static void addrconf_verify(unsigned long);
 132
 133 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 134 static DEFINE_SPINLOCK(addrconf_verify_lock);
 135
 136 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 137 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 138
 139 static int addrconf_ifdown(struct net_device *dev, int how);
 140
 141 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 142 static void addrconf_dad_timer(unsigned long data);
 143 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 144 static void addrconf_dad_run(struct inet6_dev *idev);
 145 static void addrconf_rs_timer(unsigned long data);
 146 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 147 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 148
 149 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 150                                 struct prefix_info *pinfo);
 151 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 152                               struct net_device *dev);
 153
 154 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 155
 156 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 157         .forwarding             = 0,
 158         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 159         .mtu6                   = IPV6_MIN_MTU,
 160         .accept_ra              = 1,
 161         .accept_redirects       = 1,
 162         .autoconf               = 1,
 163         .force_mld_version      = 0,
 164         .dad_transmits          = 1,
 165         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 166         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 167         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 168 #ifdef CONFIG_IPV6_PRIVACY
 169         .use_tempaddr           = 0,
 170         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 171         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 172         .regen_max_retry        = REGEN_MAX_RETRY,
 173         .max_desync_factor      = MAX_DESYNC_FACTOR,
 174 #endif
 175         .max_addresses          = IPV6_MAX_ADDRESSES,
 176         .accept_ra_defrtr       = 1,
 177         .accept_ra_pinfo        = 1,
 178 #ifdef CONFIG_IPV6_ROUTER_PREF
 179         .accept_ra_rtr_pref     = 1,
 180         .rtr_probe_interval     = 60 * HZ,
 181 #ifdef CONFIG_IPV6_ROUTE_INFO
 182         .accept_ra_rt_info_max_plen = 0,
 183 #endif
 184 #endif
 185         .proxy_ndp              = 0,
 186         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 187         .disable_ipv6           = 0,
 188         .accept_dad             = 1,
 189 };
 190
 191 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 192         .forwarding             = 0,
 193         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 194         .mtu6                   = IPV6_MIN_MTU,
 195         .accept_ra              = 1,
 196         .accept_redirects       = 1,
 197         .autoconf               = 1,
 198         .dad_transmits          = 1,
 199         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 200         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 201         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 202 #ifdef CONFIG_IPV6_PRIVACY
 203         .use_tempaddr           = 0,
 204         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 205         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 206         .regen_max_retry        = REGEN_MAX_RETRY,
 207         .max_desync_factor      = MAX_DESYNC_FACTOR,
 208 #endif
 209         .max_addresses          = IPV6_MAX_ADDRESSES,
 210         .accept_ra_defrtr       = 1,
 211         .accept_ra_pinfo        = 1,
 212 #ifdef CONFIG_IPV6_ROUTER_PREF
 213         .accept_ra_rtr_pref     = 1,
 214         .rtr_probe_interval     = 60 * HZ,
 215 #ifdef CONFIG_IPV6_ROUTE_INFO
 216         .accept_ra_rt_info_max_plen = 0,
 217 #endif
 218 #endif
 219         .proxy_ndp              = 0,
 220         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 221         .disable_ipv6           = 0,
 222         .accept_dad             = 1,
 223 };
 224
 225 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 226 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 227 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 228 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 229 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 230
 231 /* Check if a valid qdisc is available */
 232 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 233 {
 234         return !qdisc_tx_is_noop(dev);
 235 }
 236
 237 /* Check if a route is valid prefix route */
 238 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 239 {
 240         return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
 241 }
 242
 243 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 244 {
 245         if (del_timer(&ifp->timer))
 246                 __in6_ifa_put(ifp);
 247 }
 248
 249 enum addrconf_timer_t
 250 {
 251         AC_NONE,
 252         AC_DAD,
 253         AC_RS,
 254 };
 255
 256 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 257                                enum addrconf_timer_t what,
 258                                unsigned long when)
 259 {
 260         if (!del_timer(&ifp->timer))
 261                 in6_ifa_hold(ifp);
 262
 263         switch (what) {
 264         case AC_DAD:
 265                 ifp->timer.function = addrconf_dad_timer;
 266                 break;
 267         case AC_RS:
 268                 ifp->timer.function = addrconf_rs_timer;
 269                 break;
 270         default:;
 271         }
 272         ifp->timer.expires = jiffies + when;
 273         add_timer(&ifp->timer);
 274 }
 275
 276 static int snmp6_alloc_dev(struct inet6_dev *idev)
 277 {
 278         if (snmp_mib_init((void **)idev->stats.ipv6,
 279                           sizeof(struct ipstats_mib)) < 0)
 280                 goto err_ip;
 281         if (snmp_mib_init((void **)idev->stats.icmpv6,
 282                           sizeof(struct icmpv6_mib)) < 0)
 283                 goto err_icmp;
 284         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 285                           sizeof(struct icmpv6msg_mib)) < 0)
 286                 goto err_icmpmsg;
 287
 288         return 0;
 289
 290 err_icmpmsg:
 291         snmp_mib_free((void **)idev->stats.icmpv6);
 292 err_icmp:
 293         snmp_mib_free((void **)idev->stats.ipv6);
 294 err_ip:
 295         return -ENOMEM;
 296 }
 297
 298 static void snmp6_free_dev(struct inet6_dev *idev)
 299 {
 300         snmp_mib_free((void **)idev->stats.icmpv6msg);
 301         snmp_mib_free((void **)idev->stats.icmpv6);
 302         snmp_mib_free((void **)idev->stats.ipv6);
 303 }
 304
 305 /* Nobody refers to this device, we may destroy it. */
 306
 307 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 308 {
 309         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 310         kfree(idev);
 311 }
 312
 313 void in6_dev_finish_destroy(struct inet6_dev *idev)
 314 {
 315         struct net_device *dev = idev->dev;
 316
 317         WARN_ON(idev->addr_list != NULL);
 318         WARN_ON(idev->mc_list != NULL);
 319
 320 #ifdef NET_REFCNT_DEBUG
 321         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 322 #endif
 323         dev_put(dev);
 324         if (!idev->dead) {
 325                 printk("Freeing alive inet6 device %p\n", idev);
 326                 return;
 327         }
 328         snmp6_free_dev(idev);
 329         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 330 }
 331
 332 EXPORT_SYMBOL(in6_dev_finish_destroy);
 333
 334 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 335 {
 336         struct inet6_dev *ndev;
 337
 338         ASSERT_RTNL();
 339
 340         if (dev->mtu < IPV6_MIN_MTU)
 341                 return NULL;
 342
 343         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 344
 345         if (ndev == NULL)
 346                 return NULL;
 347
 348         rwlock_init(&ndev->lock);
 349         ndev->dev = dev;
 350         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 351         ndev->cnf.mtu6 = dev->mtu;
 352         ndev->cnf.sysctl = NULL;
 353         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 354         if (ndev->nd_parms == NULL) {
 355                 kfree(ndev);
 356                 return NULL;
 357         }
 358         if (ndev->cnf.forwarding)
 359                 dev_disable_lro(dev);
 360         /* We refer to the device */
 361         dev_hold(dev);
 362
 363         if (snmp6_alloc_dev(ndev) < 0) {
 364                 ADBG((KERN_WARNING
 365                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 366                         __func__, dev->name));
 367                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 368                 ndev->dead = 1;
 369                 in6_dev_finish_destroy(ndev);
 370                 return NULL;
 371         }
 372
 373         if (snmp6_register_dev(ndev) < 0) {
 374                 ADBG((KERN_WARNING
 375                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 376                         __func__, dev->name));
 377                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 378                 ndev->dead = 1;
 379                 in6_dev_finish_destroy(ndev);
 380                 return NULL;
 381         }
 382
 383         /* One reference from device.  We must do this before
 384          * we invoke __ipv6_regen_rndid().
 385          */
 386         in6_dev_hold(ndev);
 387
 388         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 389                 ndev->cnf.accept_dad = -1;
 390
 391 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 392         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 393                 printk(KERN_INFO
 394                        "%s: Disabled Multicast RS\n",
 395                        dev->name);
 396                 ndev->cnf.rtr_solicits = 0;
 397         }
 398 #endif
 399
 400 #ifdef CONFIG_IPV6_PRIVACY
 401         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 402         if ((dev->flags&IFF_LOOPBACK) ||
 403             dev->type == ARPHRD_TUNNEL ||
 404             dev->type == ARPHRD_TUNNEL6 ||
 405             dev->type == ARPHRD_SIT ||
 406             dev->type == ARPHRD_NONE) {
 407                 printk(KERN_INFO
 408                        "%s: Disabled Privacy Extensions\n",
 409                        dev->name);
 410                 ndev->cnf.use_tempaddr = -1;
 411         } else {
 412                 in6_dev_hold(ndev);
 413                 ipv6_regen_rndid((unsigned long) ndev);
 414         }
 415 #endif
 416
 417         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 418                 ndev->if_flags |= IF_READY;
 419
 420         ipv6_mc_init_dev(ndev);
 421         ndev->tstamp = jiffies;
 422         addrconf_sysctl_register(ndev);
 423         /* protected by rtnl_lock */
 424         rcu_assign_pointer(dev->ip6_ptr, ndev);
 425
 426         /* Join all-node multicast group */
 427         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 428
 429         return ndev;
 430 }
 431
 432 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 433 {
 434         struct inet6_dev *idev;
 435
 436         ASSERT_RTNL();
 437
 438         if ((idev = __in6_dev_get(dev)) == NULL) {
 439                 if ((idev = ipv6_add_dev(dev)) == NULL)
 440                         return NULL;
 441         }
 442
 443         if (dev->flags&IFF_UP)
 444                 ipv6_mc_up(idev);
 445         return idev;
 446 }
 447
 448 #ifdef CONFIG_SYSCTL
 449 static void dev_forward_change(struct inet6_dev *idev)
 450 {
 451         struct net_device *dev;
 452         struct inet6_ifaddr *ifa;
 453
 454         if (!idev)
 455                 return;
 456         dev = idev->dev;
 457         if (idev->cnf.forwarding)
 458                 dev_disable_lro(dev);
 459         if (dev && (dev->flags & IFF_MULTICAST)) {
 460                 if (idev->cnf.forwarding)
 461                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 462                 else
 463                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 464         }
 465         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 466                 if (ifa->flags&IFA_F_TENTATIVE)
 467                         continue;
 468                 if (idev->cnf.forwarding)
 469                         addrconf_join_anycast(ifa);
 470                 else
 471                         addrconf_leave_anycast(ifa);
 472         }
 473 }
 474
 475
 476 static void addrconf_forward_change(struct net *net, __s32 newf)
 477 {
 478         struct net_device *dev;
 479         struct inet6_dev *idev;
 480
 481         read_lock(&dev_base_lock);
 482         for_each_netdev(net, dev) {
 483                 rcu_read_lock();
 484                 idev = __in6_dev_get(dev);
 485                 if (idev) {
 486                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 487                         idev->cnf.forwarding = newf;
 488                         if (changed)
 489                                 dev_forward_change(idev);
 490                 }
 491                 rcu_read_unlock();
 492         }
 493         read_unlock(&dev_base_lock);
 494 }
 495
 496 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 497 {
 498         struct net *net;
 499
 500         net = (struct net *)table->extra2;
 501         if (p == &net->ipv6.devconf_dflt->forwarding)
 502                 return;
 503
 504         rtnl_lock();
 505         if (p == &net->ipv6.devconf_all->forwarding) {
 506                 __s32 newf = net->ipv6.devconf_all->forwarding;
 507                 net->ipv6.devconf_dflt->forwarding = newf;
 508                 addrconf_forward_change(net, newf);
 509         } else if ((!*p) ^ (!old))
 510                 dev_forward_change((struct inet6_dev *)table->extra1);
 511         rtnl_unlock();
 512
 513         if (*p)
 514                 rt6_purge_dflt_routers(net);
 515 }
 516 #endif
 517
 518 /* Nobody refers to this ifaddr, destroy it */
 519
 520 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 521 {
 522         WARN_ON(ifp->if_next != NULL);
 523         WARN_ON(ifp->lst_next != NULL);
 524
 525 #ifdef NET_REFCNT_DEBUG
 526         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 527 #endif
 528
 529         in6_dev_put(ifp->idev);
 530
 531         if (del_timer(&ifp->timer))
 532                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 533
 534         if (!ifp->dead) {
 535                 printk("Freeing alive inet6 address %p\n", ifp);
 536                 return;
 537         }
 538         dst_release(&ifp->rt->u.dst);
 539
 540         kfree(ifp);
 541 }
 542
 543 static void
 544 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 545 {
 546         struct inet6_ifaddr *ifa, **ifap;
 547         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 548
 549         /*
 550          * Each device address list is sorted in order of scope -
 551          * global before linklocal.
 552          */
 553         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 554              ifap = &ifa->if_next) {
 555                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 556                         break;
 557         }
 558
 559         ifp->if_next = *ifap;
 560         *ifap = ifp;
 561 }
 562
 563 /*
 564  *      Hash function taken from net_alias.c
 565  */
 566 static u8 ipv6_addr_hash(const struct in6_addr *addr)
 567 {
 568         __u32 word;
 569
 570         /*
 571          * We perform the hash function over the last 64 bits of the address
 572          * This will include the IEEE address token on links that support it.
 573          */
 574
 575         word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
 576         word ^= (word >> 16);
 577         word ^= (word >> 8);
 578
 579         return ((word ^ (word >> 4)) & 0x0f);
 580 }
 581
 582 /* On success it returns ifp with increased reference count */
 583
 584 static struct inet6_ifaddr *
 585 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 586               int scope, u32 flags)
 587 {
 588         struct inet6_ifaddr *ifa = NULL;
 589         struct rt6_info *rt;
 590         int hash;
 591         int err = 0;
 592         int addr_type = ipv6_addr_type(addr);
 593
 594         if (addr_type == IPV6_ADDR_ANY ||
 595             addr_type & IPV6_ADDR_MULTICAST ||
 596             (!(idev->dev->flags & IFF_LOOPBACK) &&
 597              addr_type & IPV6_ADDR_LOOPBACK))
 598                 return ERR_PTR(-EADDRNOTAVAIL);
 599
 600         rcu_read_lock_bh();
 601         if (idev->dead) {
 602                 err = -ENODEV;                  /*XXX*/
 603                 goto out2;
 604         }
 605
 606         write_lock(&addrconf_hash_lock);
 607
 608         /* Ignore adding duplicate addresses on an interface */
 609         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 610                 ADBG(("ipv6_add_addr: already assigned\n"));
 611                 err = -EEXIST;
 612                 goto out;
 613         }
 614
 615         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 616
 617         if (ifa == NULL) {
 618                 ADBG(("ipv6_add_addr: malloc failed\n"));
 619                 err = -ENOBUFS;
 620                 goto out;
 621         }
 622
 623         rt = addrconf_dst_alloc(idev, addr, 0);
 624         if (IS_ERR(rt)) {
 625                 err = PTR_ERR(rt);
 626                 goto out;
 627         }
 628
 629         ipv6_addr_copy(&ifa->addr, addr);
 630
 631         spin_lock_init(&ifa->lock);
 632         init_timer(&ifa->timer);
 633         ifa->timer.data = (unsigned long) ifa;
 634         ifa->scope = scope;
 635         ifa->prefix_len = pfxlen;
 636         ifa->flags = flags | IFA_F_TENTATIVE;
 637         ifa->cstamp = ifa->tstamp = jiffies;
 638
 639         ifa->rt = rt;
 640
 641         /*
 642          * part one of RFC 4429, section 3.3
 643          * We should not configure an address as
 644          * optimistic if we do not yet know the link
 645          * layer address of our nexhop router
 646          */
 647
 648         if (rt->rt6i_nexthop == NULL)
 649                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 650
 651         ifa->idev = idev;
 652         in6_dev_hold(idev);
 653         /* For caller */
 654         in6_ifa_hold(ifa);
 655
 656         /* Add to big hash table */
 657         hash = ipv6_addr_hash(addr);
 658
 659         ifa->lst_next = inet6_addr_lst[hash];
 660         inet6_addr_lst[hash] = ifa;
 661         in6_ifa_hold(ifa);
 662         write_unlock(&addrconf_hash_lock);
 663
 664         write_lock(&idev->lock);
 665         /* Add to inet6_dev unicast addr list. */
 666         ipv6_link_dev_addr(idev, ifa);
 667
 668 #ifdef CONFIG_IPV6_PRIVACY
 669         if (ifa->flags&IFA_F_TEMPORARY) {
 670                 ifa->tmp_next = idev->tempaddr_list;
 671                 idev->tempaddr_list = ifa;
 672                 in6_ifa_hold(ifa);
 673         }
 674 #endif
 675
 676         in6_ifa_hold(ifa);
 677         write_unlock(&idev->lock);
 678 out2:
 679         rcu_read_unlock_bh();
 680
 681         if (likely(err == 0))
 682                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 683         else {
 684                 kfree(ifa);
 685                 ifa = ERR_PTR(err);
 686         }
 687
 688         return ifa;
 689 out:
 690         write_unlock(&addrconf_hash_lock);
 691         goto out2;
 692 }
 693
 694 /* This function wants to get referenced ifp and releases it before return */
 695
 696 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 697 {
 698         struct inet6_ifaddr *ifa, **ifap;
 699         struct inet6_dev *idev = ifp->idev;
 700         int hash;
 701         int deleted = 0, onlink = 0;
 702         unsigned long expires = jiffies;
 703
 704         hash = ipv6_addr_hash(&ifp->addr);
 705
 706         ifp->dead = 1;
 707
 708         write_lock_bh(&addrconf_hash_lock);
 709         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 710              ifap = &ifa->lst_next) {
 711                 if (ifa == ifp) {
 712                         *ifap = ifa->lst_next;
 713                         __in6_ifa_put(ifp);
 714                         ifa->lst_next = NULL;
 715                         break;
 716                 }
 717         }
 718         write_unlock_bh(&addrconf_hash_lock);
 719
 720         write_lock_bh(&idev->lock);
 721 #ifdef CONFIG_IPV6_PRIVACY
 722         if (ifp->flags&IFA_F_TEMPORARY) {
 723                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 724                      ifap = &ifa->tmp_next) {
 725                         if (ifa == ifp) {
 726                                 *ifap = ifa->tmp_next;
 727                                 if (ifp->ifpub) {
 728                                         in6_ifa_put(ifp->ifpub);
 729                                         ifp->ifpub = NULL;
 730                                 }
 731                                 __in6_ifa_put(ifp);
 732                                 ifa->tmp_next = NULL;
 733                                 break;
 734                         }
 735                 }
 736         }
 737 #endif
 738
 739         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 740                 if (ifa == ifp) {
 741                         *ifap = ifa->if_next;
 742                         __in6_ifa_put(ifp);
 743                         ifa->if_next = NULL;
 744                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 745                                 break;
 746                         deleted = 1;
 747                         continue;
 748                 } else if (ifp->flags & IFA_F_PERMANENT) {
 749                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 750                                               ifp->prefix_len)) {
 751                                 if (ifa->flags & IFA_F_PERMANENT) {
 752                                         onlink = 1;
 753                                         if (deleted)
 754                                                 break;
 755                                 } else {
 756                                         unsigned long lifetime;
 757
 758                                         if (!onlink)
 759                                                 onlink = -1;
 760
 761                                         spin_lock(&ifa->lock);
 762
 763                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 764                                         /*
 765                                          * Note: Because this address is
 766                                          * not permanent, lifetime <
 767                                          * LONG_MAX / HZ here.
 768                                          */
 769                                         if (time_before(expires,
 770                                                         ifa->tstamp + lifetime * HZ))
 771                                                 expires = ifa->tstamp + lifetime * HZ;
 772                                         spin_unlock(&ifa->lock);
 773                                 }
 774                         }
 775                 }
 776                 ifap = &ifa->if_next;
 777         }
 778         write_unlock_bh(&idev->lock);
 779
 780         addrconf_del_timer(ifp);
 781
 782         ipv6_ifa_notify(RTM_DELADDR, ifp);
 783
 784         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 785
 786         /*
 787          * Purge or update corresponding prefix
 788          *
 789          * 1) we don't purge prefix here if address was not permanent.
 790          *    prefix is managed by its own lifetime.
 791          * 2) if there're no addresses, delete prefix.
 792          * 3) if there're still other permanent address(es),
 793          *    corresponding prefix is still permanent.
 794          * 4) otherwise, update prefix lifetime to the
 795          *    longest valid lifetime among the corresponding
 796          *    addresses on the device.
 797          *    Note: subsequent RA will update lifetime.
 798          *
 799          * --yoshfuji
 800          */
 801         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 802                 struct in6_addr prefix;
 803                 struct rt6_info *rt;
 804                 struct net *net = dev_net(ifp->idev->dev);
 805                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 806                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 807
 808                 if (rt && addrconf_is_prefix_route(rt)) {
 809                         if (onlink == 0) {
 810                                 ip6_del_rt(rt);
 811                                 rt = NULL;
 812                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 813                                 rt->rt6i_expires = expires;
 814                                 rt->rt6i_flags |= RTF_EXPIRES;
 815                         }
 816                 }
 817                 dst_release(&rt->u.dst);
 818         }
 819
 820         in6_ifa_put(ifp);
 821 }
 822
 823 #ifdef CONFIG_IPV6_PRIVACY
 824 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 825 {
 826         struct inet6_dev *idev = ifp->idev;
 827         struct in6_addr addr, *tmpaddr;
 828         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 829         unsigned long regen_advance;
 830         int tmp_plen;
 831         int ret = 0;
 832         int max_addresses;
 833         u32 addr_flags;
 834
 835         write_lock(&idev->lock);
 836         if (ift) {
 837                 spin_lock_bh(&ift->lock);
 838                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 839                 spin_unlock_bh(&ift->lock);
 840                 tmpaddr = &addr;
 841         } else {
 842                 tmpaddr = NULL;
 843         }
 844 retry:
 845         in6_dev_hold(idev);
 846         if (idev->cnf.use_tempaddr <= 0) {
 847                 write_unlock(&idev->lock);
 848                 printk(KERN_INFO
 849                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 850                 in6_dev_put(idev);
 851                 ret = -1;
 852                 goto out;
 853         }
 854         spin_lock_bh(&ifp->lock);
 855         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 856                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 857                 spin_unlock_bh(&ifp->lock);
 858                 write_unlock(&idev->lock);
 859                 printk(KERN_WARNING
 860                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 861                 in6_dev_put(idev);
 862                 ret = -1;
 863                 goto out;
 864         }
 865         in6_ifa_hold(ifp);
 866         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 867         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 868                 spin_unlock_bh(&ifp->lock);
 869                 write_unlock(&idev->lock);
 870                 printk(KERN_WARNING
 871                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 872                 in6_ifa_put(ifp);
 873                 in6_dev_put(idev);
 874                 ret = -1;
 875                 goto out;
 876         }
 877         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 878         tmp_valid_lft = min_t(__u32,
 879                               ifp->valid_lft,
 880                               idev->cnf.temp_valid_lft);
 881         tmp_prefered_lft = min_t(__u32,
 882                                  ifp->prefered_lft,
 883                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 884         tmp_plen = ifp->prefix_len;
 885         max_addresses = idev->cnf.max_addresses;
 886         tmp_cstamp = ifp->cstamp;
 887         tmp_tstamp = ifp->tstamp;
 888         spin_unlock_bh(&ifp->lock);
 889
 890         regen_advance = idev->cnf.regen_max_retry *
 891                         idev->cnf.dad_transmits *
 892                         idev->nd_parms->retrans_time / HZ;
 893         write_unlock(&idev->lock);
 894
 895         /* A temporary address is created only if this calculated Preferred
 896          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 897          * an implementation must not create a temporary address with a zero
 898          * Preferred Lifetime.
 899          */
 900         if (tmp_prefered_lft <= regen_advance) {
 901                 in6_ifa_put(ifp);
 902                 in6_dev_put(idev);
 903                 ret = -1;
 904                 goto out;
 905         }
 906
 907         addr_flags = IFA_F_TEMPORARY;
 908         /* set in addrconf_prefix_rcv() */
 909         if (ifp->flags & IFA_F_OPTIMISTIC)
 910                 addr_flags |= IFA_F_OPTIMISTIC;
 911
 912         ift = !max_addresses ||
 913               ipv6_count_addresses(idev) < max_addresses ?
 914                 ipv6_add_addr(idev, &addr, tmp_plen,
 915                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 916                               addr_flags) : NULL;
 917         if (!ift || IS_ERR(ift)) {
 918                 in6_ifa_put(ifp);
 919                 in6_dev_put(idev);
 920                 printk(KERN_INFO
 921                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 922                 tmpaddr = &addr;
 923                 write_lock(&idev->lock);
 924                 goto retry;
 925         }
 926
 927         spin_lock_bh(&ift->lock);
 928         ift->ifpub = ifp;
 929         ift->valid_lft = tmp_valid_lft;
 930         ift->prefered_lft = tmp_prefered_lft;
 931         ift->cstamp = tmp_cstamp;
 932         ift->tstamp = tmp_tstamp;
 933         spin_unlock_bh(&ift->lock);
 934
 935         addrconf_dad_start(ift, 0);
 936         in6_ifa_put(ift);
 937         in6_dev_put(idev);
 938 out:
 939         return ret;
 940 }
 941 #endif
 942
 943 /*
 944  *      Choose an appropriate source address (RFC3484)
 945  */
 946 enum {
 947         IPV6_SADDR_RULE_INIT = 0,
 948         IPV6_SADDR_RULE_LOCAL,
 949         IPV6_SADDR_RULE_SCOPE,
 950         IPV6_SADDR_RULE_PREFERRED,
 951 #ifdef CONFIG_IPV6_MIP6
 952         IPV6_SADDR_RULE_HOA,
 953 #endif
 954         IPV6_SADDR_RULE_OIF,
 955         IPV6_SADDR_RULE_LABEL,
 956 #ifdef CONFIG_IPV6_PRIVACY
 957         IPV6_SADDR_RULE_PRIVACY,
 958 #endif
 959         IPV6_SADDR_RULE_ORCHID,
 960         IPV6_SADDR_RULE_PREFIX,
 961         IPV6_SADDR_RULE_MAX
 962 };
 963
 964 struct ipv6_saddr_score {
 965         int                     rule;
 966         int                     addr_type;
 967         struct inet6_ifaddr     *ifa;
 968         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 969         int                     scopedist;
 970         int                     matchlen;
 971 };
 972
 973 struct ipv6_saddr_dst {
 974         const struct in6_addr *addr;
 975         int ifindex;
 976         int scope;
 977         int label;
 978         unsigned int prefs;
 979 };
 980
 981 static inline int ipv6_saddr_preferred(int type)
 982 {
 983         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 984                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 985                 return 1;
 986         return 0;
 987 }
 988
 989 static int ipv6_get_saddr_eval(struct net *net,
 990                                struct ipv6_saddr_score *score,
 991                                struct ipv6_saddr_dst *dst,
 992                                int i)
 993 {
 994         int ret;
 995
 996         if (i <= score->rule) {
 997                 switch (i) {
 998                 case IPV6_SADDR_RULE_SCOPE:
 999                         ret = score->scopedist;
1000                         break;
1001                 case IPV6_SADDR_RULE_PREFIX:
1002                         ret = score->matchlen;
1003                         break;
1004                 default:
1005                         ret = !!test_bit(i, score->scorebits);
1006                 }
1007                 goto out;
1008         }
1009
1010         switch (i) {
1011         case IPV6_SADDR_RULE_INIT:
1012                 /* Rule 0: remember if hiscore is not ready yet */
1013                 ret = !!score->ifa;
1014                 break;
1015         case IPV6_SADDR_RULE_LOCAL:
1016                 /* Rule 1: Prefer same address */
1017                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018                 break;
1019         case IPV6_SADDR_RULE_SCOPE:
1020                 /* Rule 2: Prefer appropriate scope
1021                  *
1022                  *      ret
1023                  *       ^
1024                  *    -1 |  d 15
1025                  *    ---+--+-+---> scope
1026                  *       |
1027                  *       |             d is scope of the destination.
1028                  *  B-d  |  \
1029                  *       |   \      <- smaller scope is better if
1030                  *  B-15 |    \        if scope is enough for destinaion.
1031                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1032                  * d-C-1 | /
1033                  *       |/         <- greater is better
1034                  *   -C  /             if scope is not enough for destination.
1035                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1036                  *
1037                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039                  * Assume B = 0 and we get C > 29.
1040                  */
1041                 ret = __ipv6_addr_src_scope(score->addr_type);
1042                 if (ret >= dst->scope)
1043                         ret = -ret;
1044                 else
1045                         ret -= 128;     /* 30 is enough */
1046                 score->scopedist = ret;
1047                 break;
1048         case IPV6_SADDR_RULE_PREFERRED:
1049                 /* Rule 3: Avoid deprecated and optimistic addresses */
1050                 ret = ipv6_saddr_preferred(score->addr_type) ||
1051                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052                 break;
1053 #ifdef CONFIG_IPV6_MIP6
1054         case IPV6_SADDR_RULE_HOA:
1055             {
1056                 /* Rule 4: Prefer home address */
1057                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1059                 break;
1060             }
1061 #endif
1062         case IPV6_SADDR_RULE_OIF:
1063                 /* Rule 5: Prefer outgoing interface */
1064                 ret = (!dst->ifindex ||
1065                        dst->ifindex == score->ifa->idev->dev->ifindex);
1066                 break;
1067         case IPV6_SADDR_RULE_LABEL:
1068                 /* Rule 6: Prefer matching label */
1069                 ret = ipv6_addr_label(net,
1070                                       &score->ifa->addr, score->addr_type,
1071                                       score->ifa->idev->dev->ifindex) == dst->label;
1072                 break;
1073 #ifdef CONFIG_IPV6_PRIVACY
1074         case IPV6_SADDR_RULE_PRIVACY:
1075             {
1076                 /* Rule 7: Prefer public address
1077                  * Note: prefer temprary address if use_tempaddr >= 2
1078                  */
1079                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1082                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1083                 break;
1084             }
1085 #endif
1086         case IPV6_SADDR_RULE_ORCHID:
1087                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088                  *          non-ORCHID vs non-ORCHID
1089                  */
1090                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091                         ipv6_addr_orchid(dst->addr));
1092                 break;
1093         case IPV6_SADDR_RULE_PREFIX:
1094                 /* Rule 8: Use longest matching prefix */
1095                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096                                                        dst->addr);
1097                 break;
1098         default:
1099                 ret = 0;
1100         }
1101
1102         if (ret)
1103                 __set_bit(i, score->scorebits);
1104         score->rule = i;
1105 out:
1106         return ret;
1107 }
1108
1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110                        const struct in6_addr *daddr, unsigned int prefs,
1111                        struct in6_addr *saddr)
1112 {
1113         struct ipv6_saddr_score scores[2],
1114                                 *score = &scores[0], *hiscore = &scores[1];
1115         struct ipv6_saddr_dst dst;
1116         struct net_device *dev;
1117         int dst_type;
1118
1119         dst_type = __ipv6_addr_type(daddr);
1120         dst.addr = daddr;
1121         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122         dst.scope = __ipv6_addr_src_scope(dst_type);
1123         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1124         dst.prefs = prefs;
1125
1126         hiscore->rule = -1;
1127         hiscore->ifa = NULL;
1128
1129         read_lock(&dev_base_lock);
1130         rcu_read_lock();
1131
1132         for_each_netdev(net, dev) {
1133                 struct inet6_dev *idev;
1134
1135                 /* Candidate Source Address (section 4)
1136                  *  - multicast and link-local destination address,
1137                  *    the set of candidate source address MUST only
1138                  *    include addresses assigned to interfaces
1139                  *    belonging to the same link as the outgoing
1140                  *    interface.
1141                  * (- For site-local destination addresses, the
1142                  *    set of candidate source addresses MUST only
1143                  *    include addresses assigned to interfaces
1144                  *    belonging to the same site as the outgoing
1145                  *    interface.)
1146                  */
1147                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1148                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1149                     dst.ifindex && dev->ifindex != dst.ifindex)
1150                         continue;
1151
1152                 idev = __in6_dev_get(dev);
1153                 if (!idev)
1154                         continue;
1155
1156                 read_lock_bh(&idev->lock);
1157                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1158                         int i;
1159
1160                         /*
1161                          * - Tentative Address (RFC2462 section 5.4)
1162                          *  - A tentative address is not considered
1163                          *    "assigned to an interface" in the traditional
1164                          *    sense, unless it is also flagged as optimistic.
1165                          * - Candidate Source Address (section 4)
1166                          *  - In any case, anycast addresses, multicast
1167                          *    addresses, and the unspecified address MUST
1168                          *    NOT be included in a candidate set.
1169                          */
1170                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1171                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1172                                 continue;
1173
1174                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1175
1176                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1177                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1178                                 LIMIT_NETDEBUG(KERN_DEBUG
1179                                                "ADDRCONF: unspecified / multicast address "
1180                                                "assigned as unicast address on %s",
1181                                                dev->name);
1182                                 continue;
1183                         }
1184
1185                         score->rule = -1;
1186                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1187
1188                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1189                                 int minihiscore, miniscore;
1190
1191                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1192                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1193
1194                                 if (minihiscore > miniscore) {
1195                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1196                                             score->scopedist > 0) {
1197                                                 /*
1198                                                  * special case:
1199                                                  * each remaining entry
1200                                                  * has too small (not enough)
1201                                                  * scope, because ifa entries
1202                                                  * are sorted by their scope
1203                                                  * values.
1204                                                  */
1205                                                 goto try_nextdev;
1206                                         }
1207                                         break;
1208                                 } else if (minihiscore < miniscore) {
1209                                         struct ipv6_saddr_score *tmp;
1210
1211                                         if (hiscore->ifa)
1212                                                 in6_ifa_put(hiscore->ifa);
1213
1214                                         in6_ifa_hold(score->ifa);
1215
1216                                         tmp = hiscore;
1217                                         hiscore = score;
1218                                         score = tmp;
1219
1220                                         /* restore our iterator */
1221                                         score->ifa = hiscore->ifa;
1222
1223                                         break;
1224                                 }
1225                         }
1226                 }
1227 try_nextdev:
1228                 read_unlock_bh(&idev->lock);
1229         }
1230         rcu_read_unlock();
1231         read_unlock(&dev_base_lock);
1232
1233         if (!hiscore->ifa)
1234                 return -EADDRNOTAVAIL;
1235
1236         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1237         in6_ifa_put(hiscore->ifa);
1238         return 0;
1239 }
1240
1241 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1242
1243 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1244                     unsigned char banned_flags)
1245 {
1246         struct inet6_dev *idev;
1247         int err = -EADDRNOTAVAIL;
1248
1249         rcu_read_lock();
1250         if ((idev = __in6_dev_get(dev)) != NULL) {
1251                 struct inet6_ifaddr *ifp;
1252
1253                 read_lock_bh(&idev->lock);
1254                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1255                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1256                                 ipv6_addr_copy(addr, &ifp->addr);
1257                                 err = 0;
1258                                 break;
1259                         }
1260                 }
1261                 read_unlock_bh(&idev->lock);
1262         }
1263         rcu_read_unlock();
1264         return err;
1265 }
1266
1267 static int ipv6_count_addresses(struct inet6_dev *idev)
1268 {
1269         int cnt = 0;
1270         struct inet6_ifaddr *ifp;
1271
1272         read_lock_bh(&idev->lock);
1273         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1274                 cnt++;
1275         read_unlock_bh(&idev->lock);
1276         return cnt;
1277 }
1278
1279 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1280                   struct net_device *dev, int strict)
1281 {
1282         struct inet6_ifaddr * ifp;
1283         u8 hash = ipv6_addr_hash(addr);
1284
1285         read_lock_bh(&addrconf_hash_lock);
1286         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1287                 if (!net_eq(dev_net(ifp->idev->dev), net))
1288                         continue;
1289                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1290                     !(ifp->flags&IFA_F_TENTATIVE)) {
1291                         if (dev == NULL || ifp->idev->dev == dev ||
1292                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1293                                 break;
1294                 }
1295         }
1296         read_unlock_bh(&addrconf_hash_lock);
1297         return ifp != NULL;
1298 }
1299 EXPORT_SYMBOL(ipv6_chk_addr);
1300
1301 static
1302 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1303                        struct net_device *dev)
1304 {
1305         struct inet6_ifaddr * ifp;
1306         u8 hash = ipv6_addr_hash(addr);
1307
1308         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1309                 if (!net_eq(dev_net(ifp->idev->dev), net))
1310                         continue;
1311                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1312                         if (dev == NULL || ifp->idev->dev == dev)
1313                                 break;
1314                 }
1315         }
1316         return ifp != NULL;
1317 }
1318
1319 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1320 {
1321         struct inet6_dev *idev;
1322         struct inet6_ifaddr *ifa;
1323         int     onlink;
1324
1325         onlink = 0;
1326         rcu_read_lock();
1327         idev = __in6_dev_get(dev);
1328         if (idev) {
1329                 read_lock_bh(&idev->lock);
1330                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1331                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1332                                                    ifa->prefix_len);
1333                         if (onlink)
1334                                 break;
1335                 }
1336                 read_unlock_bh(&idev->lock);
1337         }
1338         rcu_read_unlock();
1339         return onlink;
1340 }
1341
1342 EXPORT_SYMBOL(ipv6_chk_prefix);
1343
1344 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1345                                      struct net_device *dev, int strict)
1346 {
1347         struct inet6_ifaddr * ifp;
1348         u8 hash = ipv6_addr_hash(addr);
1349
1350         read_lock_bh(&addrconf_hash_lock);
1351         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1352                 if (!net_eq(dev_net(ifp->idev->dev), net))
1353                         continue;
1354                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1355                         if (dev == NULL || ifp->idev->dev == dev ||
1356                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1357                                 in6_ifa_hold(ifp);
1358                                 break;
1359                         }
1360                 }
1361         }
1362         read_unlock_bh(&addrconf_hash_lock);
1363
1364         return ifp;
1365 }
1366
1367 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1368 {
1369         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1370         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1371         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1372         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1373         int sk_ipv6only = ipv6_only_sock(sk);
1374         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1375         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1376         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1377
1378         if (!sk2_rcv_saddr && !sk_ipv6only)
1379                 return 1;
1380
1381         if (addr_type2 == IPV6_ADDR_ANY &&
1382             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1383                 return 1;
1384
1385         if (addr_type == IPV6_ADDR_ANY &&
1386             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1387                 return 1;
1388
1389         if (sk2_rcv_saddr6 &&
1390             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1391                 return 1;
1392
1393         if (addr_type == IPV6_ADDR_MAPPED &&
1394             !sk2_ipv6only &&
1395             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1396                 return 1;
1397
1398         return 0;
1399 }
1400
1401 /* Gets referenced address, destroys ifaddr */
1402
1403 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1404 {
1405         if (ifp->flags&IFA_F_PERMANENT) {
1406                 spin_lock_bh(&ifp->lock);
1407                 addrconf_del_timer(ifp);
1408                 ifp->flags |= IFA_F_TENTATIVE;
1409                 spin_unlock_bh(&ifp->lock);
1410                 in6_ifa_put(ifp);
1411 #ifdef CONFIG_IPV6_PRIVACY
1412         } else if (ifp->flags&IFA_F_TEMPORARY) {
1413                 struct inet6_ifaddr *ifpub;
1414                 spin_lock_bh(&ifp->lock);
1415                 ifpub = ifp->ifpub;
1416                 if (ifpub) {
1417                         in6_ifa_hold(ifpub);
1418                         spin_unlock_bh(&ifp->lock);
1419                         ipv6_create_tempaddr(ifpub, ifp);
1420                         in6_ifa_put(ifpub);
1421                 } else {
1422                         spin_unlock_bh(&ifp->lock);
1423                 }
1424                 ipv6_del_addr(ifp);
1425 #endif
1426         } else
1427                 ipv6_del_addr(ifp);
1428 }
1429
1430 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1431 {
1432         struct inet6_dev *idev = ifp->idev;
1433         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1434                 struct in6_addr addr;
1435
1436                 addr.s6_addr32[0] = htonl(0xfe800000);
1437                 addr.s6_addr32[1] = 0;
1438
1439                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1440                     ipv6_addr_equal(&ifp->addr, &addr)) {
1441                         /* DAD failed for link-local based on MAC address */
1442                         idev->cnf.disable_ipv6 = 1;
1443                 }
1444         }
1445
1446         if (net_ratelimit())
1447                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1448         addrconf_dad_stop(ifp);
1449 }
1450
1451 /* Join to solicited addr multicast group. */
1452
1453 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1454 {
1455         struct in6_addr maddr;
1456
1457         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1458                 return;
1459
1460         addrconf_addr_solict_mult(addr, &maddr);
1461         ipv6_dev_mc_inc(dev, &maddr);
1462 }
1463
1464 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1465 {
1466         struct in6_addr maddr;
1467
1468         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1469                 return;
1470
1471         addrconf_addr_solict_mult(addr, &maddr);
1472         __ipv6_dev_mc_dec(idev, &maddr);
1473 }
1474
1475 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1476 {
1477         struct in6_addr addr;
1478         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1479         if (ipv6_addr_any(&addr))
1480                 return;
1481         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1482 }
1483
1484 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1485 {
1486         struct in6_addr addr;
1487         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1488         if (ipv6_addr_any(&addr))
1489                 return;
1490         __ipv6_dev_ac_dec(ifp->idev, &addr);
1491 }
1492
1493 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1494 {
1495         if (dev->addr_len != ETH_ALEN)
1496                 return -1;
1497         memcpy(eui, dev->dev_addr, 3);
1498         memcpy(eui + 5, dev->dev_addr + 3, 3);
1499
1500         /*
1501          * The zSeries OSA network cards can be shared among various
1502          * OS instances, but the OSA cards have only one MAC address.
1503          * This leads to duplicate address conflicts in conjunction
1504          * with IPv6 if more than one instance uses the same card.
1505          *
1506          * The driver for these cards can deliver a unique 16-bit
1507          * identifier for each instance sharing the same card.  It is
1508          * placed instead of 0xFFFE in the interface identifier.  The
1509          * "u" bit of the interface identifier is not inverted in this
1510          * case.  Hence the resulting interface identifier has local
1511          * scope according to RFC2373.
1512          */
1513         if (dev->dev_id) {
1514                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1515                 eui[4] = dev->dev_id & 0xFF;
1516         } else {
1517                 eui[3] = 0xFF;
1518                 eui[4] = 0xFE;
1519                 eui[0] ^= 2;
1520         }
1521         return 0;
1522 }
1523
1524 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1525 {
1526         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1527         if (dev->addr_len != ARCNET_ALEN)
1528                 return -1;
1529         memset(eui, 0, 7);
1530         eui[7] = *(u8*)dev->dev_addr;
1531         return 0;
1532 }
1533
1534 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1535 {
1536         if (dev->addr_len != INFINIBAND_ALEN)
1537                 return -1;
1538         memcpy(eui, dev->dev_addr + 12, 8);
1539         eui[0] |= 2;
1540         return 0;
1541 }
1542
1543 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1544 {
1545         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1546                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1547                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1548                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1549                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1550                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1551         eui[1] = 0;
1552         eui[2] = 0x5E;
1553         eui[3] = 0xFE;
1554         memcpy(eui + 4, &addr, 4);
1555         return 0;
1556 }
1557 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1558
1559 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1560 {
1561         if (dev->priv_flags & IFF_ISATAP)
1562                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563         return -1;
1564 }
1565
1566 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1567 {
1568         switch (dev->type) {
1569         case ARPHRD_ETHER:
1570         case ARPHRD_FDDI:
1571         case ARPHRD_IEEE802_TR:
1572                 return addrconf_ifid_eui48(eui, dev);
1573         case ARPHRD_ARCNET:
1574                 return addrconf_ifid_arcnet(eui, dev);
1575         case ARPHRD_INFINIBAND:
1576                 return addrconf_ifid_infiniband(eui, dev);
1577         case ARPHRD_SIT:
1578                 return addrconf_ifid_sit(eui, dev);
1579         }
1580         return -1;
1581 }
1582
1583 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1584 {
1585         int err = -1;
1586         struct inet6_ifaddr *ifp;
1587
1588         read_lock_bh(&idev->lock);
1589         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1590                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1591                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1592                         err = 0;
1593                         break;
1594                 }
1595         }
1596         read_unlock_bh(&idev->lock);
1597         return err;
1598 }
1599
1600 #ifdef CONFIG_IPV6_PRIVACY
1601 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1602 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1603 {
1604 regen:
1605         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1606         idev->rndid[0] &= ~0x02;
1607
1608         /*
1609          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1610          * check if generated address is not inappropriate
1611          *
1612          *  - Reserved subnet anycast (RFC 2526)
1613          *      11111101 11....11 1xxxxxxx
1614          *  - ISATAP (RFC4214) 6.1
1615          *      00-00-5E-FE-xx-xx-xx-xx
1616          *  - value 0
1617          *  - XXX: already assigned to an address on the device
1618          */
1619         if (idev->rndid[0] == 0xfd &&
1620             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1621             (idev->rndid[7]&0x80))
1622                 goto regen;
1623         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1624                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1625                         goto regen;
1626                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1627                         goto regen;
1628         }
1629
1630         return 0;
1631 }
1632
1633 static void ipv6_regen_rndid(unsigned long data)
1634 {
1635         struct inet6_dev *idev = (struct inet6_dev *) data;
1636         unsigned long expires;
1637
1638         rcu_read_lock_bh();
1639         write_lock_bh(&idev->lock);
1640
1641         if (idev->dead)
1642                 goto out;
1643
1644         if (__ipv6_regen_rndid(idev) < 0)
1645                 goto out;
1646
1647         expires = jiffies +
1648                 idev->cnf.temp_prefered_lft * HZ -
1649                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1650         if (time_before(expires, jiffies)) {
1651                 printk(KERN_WARNING
1652                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1653                         idev->dev->name);
1654                 goto out;
1655         }
1656
1657         if (!mod_timer(&idev->regen_timer, expires))
1658                 in6_dev_hold(idev);
1659
1660 out:
1661         write_unlock_bh(&idev->lock);
1662         rcu_read_unlock_bh();
1663         in6_dev_put(idev);
1664 }
1665
1666 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1667         int ret = 0;
1668
1669         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1670                 ret = __ipv6_regen_rndid(idev);
1671         return ret;
1672 }
1673 #endif
1674
1675 /*
1676  *      Add prefix route.
1677  */
1678
1679 static void
1680 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1681                       unsigned long expires, u32 flags)
1682 {
1683         struct fib6_config cfg = {
1684                 .fc_table = RT6_TABLE_PREFIX,
1685                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1686                 .fc_ifindex = dev->ifindex,
1687                 .fc_expires = expires,
1688                 .fc_dst_len = plen,
1689                 .fc_flags = RTF_UP | flags,
1690                 .fc_nlinfo.nl_net = dev_net(dev),
1691         };
1692
1693         ipv6_addr_copy(&cfg.fc_dst, pfx);
1694
1695         /* Prevent useless cloning on PtP SIT.
1696            This thing is done here expecting that the whole
1697            class of non-broadcast devices need not cloning.
1698          */
1699 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1700         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1701                 cfg.fc_flags |= RTF_NONEXTHOP;
1702 #endif
1703
1704         ip6_route_add(&cfg);
1705 }
1706
1707 /* Create "default" multicast route to the interface */
1708
1709 static void addrconf_add_mroute(struct net_device *dev)
1710 {
1711         struct fib6_config cfg = {
1712                 .fc_table = RT6_TABLE_LOCAL,
1713                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1714                 .fc_ifindex = dev->ifindex,
1715                 .fc_dst_len = 8,
1716                 .fc_flags = RTF_UP,
1717                 .fc_nlinfo.nl_net = dev_net(dev),
1718         };
1719
1720         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1721
1722         ip6_route_add(&cfg);
1723 }
1724
1725 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1726 static void sit_route_add(struct net_device *dev)
1727 {
1728         struct fib6_config cfg = {
1729                 .fc_table = RT6_TABLE_MAIN,
1730                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1731                 .fc_ifindex = dev->ifindex,
1732                 .fc_dst_len = 96,
1733                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1734                 .fc_nlinfo.nl_net = dev_net(dev),
1735         };
1736
1737         /* prefix length - 96 bits "::d.d.d.d" */
1738         ip6_route_add(&cfg);
1739 }
1740 #endif
1741
1742 static void addrconf_add_lroute(struct net_device *dev)
1743 {
1744         struct in6_addr addr;
1745
1746         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1747         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1748 }
1749
1750 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1751 {
1752         struct inet6_dev *idev;
1753
1754         ASSERT_RTNL();
1755
1756         if ((idev = ipv6_find_idev(dev)) == NULL)
1757                 return NULL;
1758
1759         /* Add default multicast route */
1760         addrconf_add_mroute(dev);
1761
1762         /* Add link local route */
1763         addrconf_add_lroute(dev);
1764         return idev;
1765 }
1766
1767 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1768 {
1769         struct prefix_info *pinfo;
1770         __u32 valid_lft;
1771         __u32 prefered_lft;
1772         int addr_type;
1773         struct inet6_dev *in6_dev;
1774
1775         pinfo = (struct prefix_info *) opt;
1776
1777         if (len < sizeof(struct prefix_info)) {
1778                 ADBG(("addrconf: prefix option too short\n"));
1779                 return;
1780         }
1781
1782         /*
1783          *      Validation checks ([ADDRCONF], page 19)
1784          */
1785
1786         addr_type = ipv6_addr_type(&pinfo->prefix);
1787
1788         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1789                 return;
1790
1791         valid_lft = ntohl(pinfo->valid);
1792         prefered_lft = ntohl(pinfo->prefered);
1793
1794         if (prefered_lft > valid_lft) {
1795                 if (net_ratelimit())
1796                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1797                 return;
1798         }
1799
1800         in6_dev = in6_dev_get(dev);
1801
1802         if (in6_dev == NULL) {
1803                 if (net_ratelimit())
1804                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1805                 return;
1806         }
1807
1808         /*
1809          *      Two things going on here:
1810          *      1) Add routes for on-link prefixes
1811          *      2) Configure prefixes with the auto flag set
1812          */
1813
1814         if (pinfo->onlink) {
1815                 struct rt6_info *rt;
1816                 unsigned long rt_expires;
1817
1818                 /* Avoid arithmetic overflow. Really, we could
1819                  * save rt_expires in seconds, likely valid_lft,
1820                  * but it would require division in fib gc, that it
1821                  * not good.
1822                  */
1823                 if (HZ > USER_HZ)
1824                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1825                 else
1826                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1827
1828                 if (addrconf_finite_timeout(rt_expires))
1829                         rt_expires *= HZ;
1830
1831                 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1832                                 dev->ifindex, 1);
1833
1834                 if (rt && addrconf_is_prefix_route(rt)) {
1835                         /* Autoconf prefix route */
1836                         if (valid_lft == 0) {
1837                                 ip6_del_rt(rt);
1838                                 rt = NULL;
1839                         } else if (addrconf_finite_timeout(rt_expires)) {
1840                                 /* not infinity */
1841                                 rt->rt6i_expires = jiffies + rt_expires;
1842                                 rt->rt6i_flags |= RTF_EXPIRES;
1843                         } else {
1844                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1845                                 rt->rt6i_expires = 0;
1846                         }
1847                 } else if (valid_lft) {
1848                         clock_t expires = 0;
1849                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1850                         if (addrconf_finite_timeout(rt_expires)) {
1851                                 /* not infinity */
1852                                 flags |= RTF_EXPIRES;
1853                                 expires = jiffies_to_clock_t(rt_expires);
1854                         }
1855                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1856                                               dev, expires, flags);
1857                 }
1858                 if (rt)
1859                         dst_release(&rt->u.dst);
1860         }
1861
1862         /* Try to figure out our local address for this prefix */
1863
1864         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1865                 struct inet6_ifaddr * ifp;
1866                 struct in6_addr addr;
1867                 int create = 0, update_lft = 0;
1868                 struct net *net = dev_net(dev);
1869
1870                 if (pinfo->prefix_len == 64) {
1871                         memcpy(&addr, &pinfo->prefix, 8);
1872                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1873                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1874                                 in6_dev_put(in6_dev);
1875                                 return;
1876                         }
1877                         goto ok;
1878                 }
1879                 if (net_ratelimit())
1880                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1881                                pinfo->prefix_len);
1882                 in6_dev_put(in6_dev);
1883                 return;
1884
1885 ok:
1886
1887                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1888
1889                 if (ifp == NULL && valid_lft) {
1890                         int max_addresses = in6_dev->cnf.max_addresses;
1891                         u32 addr_flags = 0;
1892
1893 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1894                         if (in6_dev->cnf.optimistic_dad &&
1895                             !net->ipv6.devconf_all->forwarding)
1896                                 addr_flags = IFA_F_OPTIMISTIC;
1897 #endif
1898
1899                         /* Do not allow to create too much of autoconfigured
1900                          * addresses; this would be too easy way to crash kernel.
1901                          */
1902                         if (!max_addresses ||
1903                             ipv6_count_addresses(in6_dev) < max_addresses)
1904                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1905                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1906                                                     addr_flags);
1907
1908                         if (!ifp || IS_ERR(ifp)) {
1909                                 in6_dev_put(in6_dev);
1910                                 return;
1911                         }
1912
1913                         update_lft = create = 1;
1914                         ifp->cstamp = jiffies;
1915                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1916                 }
1917
1918                 if (ifp) {
1919                         int flags;
1920                         unsigned long now;
1921 #ifdef CONFIG_IPV6_PRIVACY
1922                         struct inet6_ifaddr *ift;
1923 #endif
1924                         u32 stored_lft;
1925
1926                         /* update lifetime (RFC2462 5.5.3 e) */
1927                         spin_lock(&ifp->lock);
1928                         now = jiffies;
1929                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1930                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1931                         else
1932                                 stored_lft = 0;
1933                         if (!update_lft && stored_lft) {
1934                                 if (valid_lft > MIN_VALID_LIFETIME ||
1935                                     valid_lft > stored_lft)
1936                                         update_lft = 1;
1937                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1938                                         /* valid_lft <= stored_lft is always true */
1939                                         /* XXX: IPsec */
1940                                         update_lft = 0;
1941                                 } else {
1942                                         valid_lft = MIN_VALID_LIFETIME;
1943                                         if (valid_lft < prefered_lft)
1944                                                 prefered_lft = valid_lft;
1945                                         update_lft = 1;
1946                                 }
1947                         }
1948
1949                         if (update_lft) {
1950                                 ifp->valid_lft = valid_lft;
1951                                 ifp->prefered_lft = prefered_lft;
1952                                 ifp->tstamp = now;
1953                                 flags = ifp->flags;
1954                                 ifp->flags &= ~IFA_F_DEPRECATED;
1955                                 spin_unlock(&ifp->lock);
1956
1957                                 if (!(flags&IFA_F_TENTATIVE))
1958                                         ipv6_ifa_notify(0, ifp);
1959                         } else
1960                                 spin_unlock(&ifp->lock);
1961
1962 #ifdef CONFIG_IPV6_PRIVACY
1963                         read_lock_bh(&in6_dev->lock);
1964                         /* update all temporary addresses in the list */
1965                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1966                                 /*
1967                                  * When adjusting the lifetimes of an existing
1968                                  * temporary address, only lower the lifetimes.
1969                                  * Implementations must not increase the
1970                                  * lifetimes of an existing temporary address
1971                                  * when processing a Prefix Information Option.
1972                                  */
1973                                 if (ifp != ift->ifpub)
1974                                         continue;
1975
1976                                 spin_lock(&ift->lock);
1977                                 flags = ift->flags;
1978                                 if (ift->valid_lft > valid_lft &&
1979                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1980                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1981                                 if (ift->prefered_lft > prefered_lft &&
1982                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1983                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1984                                 spin_unlock(&ift->lock);
1985                                 if (!(flags&IFA_F_TENTATIVE))
1986                                         ipv6_ifa_notify(0, ift);
1987                         }
1988
1989                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1990                                 /*
1991                                  * When a new public address is created as described in [ADDRCONF],
1992                                  * also create a new temporary address.
1993                                  */
1994                                 read_unlock_bh(&in6_dev->lock);
1995                                 ipv6_create_tempaddr(ifp, NULL);
1996                         } else {
1997                                 read_unlock_bh(&in6_dev->lock);
1998                         }
1999 #endif
2000                         in6_ifa_put(ifp);
2001                         addrconf_verify(0);
2002                 }
2003         }
2004         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2005         in6_dev_put(in6_dev);
2006 }
2007
2008 /*
2009  *      Set destination address.
2010  *      Special case for SIT interfaces where we create a new "virtual"
2011  *      device.
2012  */
2013 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2014 {
2015         struct in6_ifreq ireq;
2016         struct net_device *dev;
2017         int err = -EINVAL;
2018
2019         rtnl_lock();
2020
2021         err = -EFAULT;
2022         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2023                 goto err_exit;
2024
2025         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2026
2027         err = -ENODEV;
2028         if (dev == NULL)
2029                 goto err_exit;
2030
2031 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2032         if (dev->type == ARPHRD_SIT) {
2033                 struct ifreq ifr;
2034                 mm_segment_t    oldfs;
2035                 struct ip_tunnel_parm p;
2036
2037                 err = -EADDRNOTAVAIL;
2038                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2039                         goto err_exit;
2040
2041                 memset(&p, 0, sizeof(p));
2042                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2043                 p.iph.saddr = 0;
2044                 p.iph.version = 4;
2045                 p.iph.ihl = 5;
2046                 p.iph.protocol = IPPROTO_IPV6;
2047                 p.iph.ttl = 64;
2048                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2049
2050                 oldfs = get_fs(); set_fs(KERNEL_DS);
2051                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2052                 set_fs(oldfs);
2053
2054                 if (err == 0) {
2055                         err = -ENOBUFS;
2056                         dev = __dev_get_by_name(net, p.name);
2057                         if (!dev)
2058                                 goto err_exit;
2059                         err = dev_open(dev);
2060                 }
2061         }
2062 #endif
2063
2064 err_exit:
2065         rtnl_unlock();
2066         return err;
2067 }
2068
2069 /*
2070  *      Manual configuration of address on an interface
2071  */
2072 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2073                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2074                           __u32 valid_lft)
2075 {
2076         struct inet6_ifaddr *ifp;
2077         struct inet6_dev *idev;
2078         struct net_device *dev;
2079         int scope;
2080         u32 flags;
2081         clock_t expires;
2082         unsigned long timeout;
2083
2084         ASSERT_RTNL();
2085
2086         if (plen > 128)
2087                 return -EINVAL;
2088
2089         /* check the lifetime */
2090         if (!valid_lft || prefered_lft > valid_lft)
2091                 return -EINVAL;
2092
2093         dev = __dev_get_by_index(net, ifindex);
2094         if (!dev)
2095                 return -ENODEV;
2096
2097         if ((idev = addrconf_add_dev(dev)) == NULL)
2098                 return -ENOBUFS;
2099
2100         scope = ipv6_addr_scope(pfx);
2101
2102         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2103         if (addrconf_finite_timeout(timeout)) {
2104                 expires = jiffies_to_clock_t(timeout * HZ);
2105                 valid_lft = timeout;
2106                 flags = RTF_EXPIRES;
2107         } else {
2108                 expires = 0;
2109                 flags = 0;
2110                 ifa_flags |= IFA_F_PERMANENT;
2111         }
2112
2113         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2114         if (addrconf_finite_timeout(timeout)) {
2115                 if (timeout == 0)
2116                         ifa_flags |= IFA_F_DEPRECATED;
2117                 prefered_lft = timeout;
2118         }
2119
2120         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2121
2122         if (!IS_ERR(ifp)) {
2123                 spin_lock_bh(&ifp->lock);
2124                 ifp->valid_lft = valid_lft;
2125                 ifp->prefered_lft = prefered_lft;
2126                 ifp->tstamp = jiffies;
2127                 spin_unlock_bh(&ifp->lock);
2128
2129                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2130                                       expires, flags);
2131                 /*
2132                  * Note that section 3.1 of RFC 4429 indicates
2133                  * that the Optimistic flag should not be set for
2134                  * manually configured addresses
2135                  */
2136                 addrconf_dad_start(ifp, 0);
2137                 in6_ifa_put(ifp);
2138                 addrconf_verify(0);
2139                 return 0;
2140         }
2141
2142         return PTR_ERR(ifp);
2143 }
2144
2145 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2146                           unsigned int plen)
2147 {
2148         struct inet6_ifaddr *ifp;
2149         struct inet6_dev *idev;
2150         struct net_device *dev;
2151
2152         if (plen > 128)
2153                 return -EINVAL;
2154
2155         dev = __dev_get_by_index(net, ifindex);
2156         if (!dev)
2157                 return -ENODEV;
2158
2159         if ((idev = __in6_dev_get(dev)) == NULL)
2160                 return -ENXIO;
2161
2162         read_lock_bh(&idev->lock);
2163         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2164                 if (ifp->prefix_len == plen &&
2165                     ipv6_addr_equal(pfx, &ifp->addr)) {
2166                         in6_ifa_hold(ifp);
2167                         read_unlock_bh(&idev->lock);
2168
2169                         ipv6_del_addr(ifp);
2170
2171                         /* If the last address is deleted administratively,
2172                            disable IPv6 on this interface.
2173                          */
2174                         if (idev->addr_list == NULL)
2175                                 addrconf_ifdown(idev->dev, 1);
2176                         return 0;
2177                 }
2178         }
2179         read_unlock_bh(&idev->lock);
2180         return -EADDRNOTAVAIL;
2181 }
2182
2183
2184 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2185 {
2186         struct in6_ifreq ireq;
2187         int err;
2188
2189         if (!capable(CAP_NET_ADMIN))
2190                 return -EPERM;
2191
2192         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2193                 return -EFAULT;
2194
2195         rtnl_lock();
2196         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2197                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2198                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2199         rtnl_unlock();
2200         return err;
2201 }
2202
2203 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2204 {
2205         struct in6_ifreq ireq;
2206         int err;
2207
2208         if (!capable(CAP_NET_ADMIN))
2209                 return -EPERM;
2210
2211         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2212                 return -EFAULT;
2213
2214         rtnl_lock();
2215         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2216                              ireq.ifr6_prefixlen);
2217         rtnl_unlock();
2218         return err;
2219 }
2220
2221 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2222 static void sit_add_v4_addrs(struct inet6_dev *idev)
2223 {
2224         struct inet6_ifaddr * ifp;
2225         struct in6_addr addr;
2226         struct net_device *dev;
2227         struct net *net = dev_net(idev->dev);
2228         int scope;
2229
2230         ASSERT_RTNL();
2231
2232         memset(&addr, 0, sizeof(struct in6_addr));
2233         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2234
2235         if (idev->dev->flags&IFF_POINTOPOINT) {
2236                 addr.s6_addr32[0] = htonl(0xfe800000);
2237                 scope = IFA_LINK;
2238         } else {
2239                 scope = IPV6_ADDR_COMPATv4;
2240         }
2241
2242         if (addr.s6_addr32[3]) {
2243                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2244                 if (!IS_ERR(ifp)) {
2245                         spin_lock_bh(&ifp->lock);
2246                         ifp->flags &= ~IFA_F_TENTATIVE;
2247                         spin_unlock_bh(&ifp->lock);
2248                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2249                         in6_ifa_put(ifp);
2250                 }
2251                 return;
2252         }
2253
2254         for_each_netdev(net, dev) {
2255                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2256                 if (in_dev && (dev->flags & IFF_UP)) {
2257                         struct in_ifaddr * ifa;
2258
2259                         int flag = scope;
2260
2261                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2262                                 int plen;
2263
2264                                 addr.s6_addr32[3] = ifa->ifa_local;
2265
2266                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2267                                         continue;
2268                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2269                                         if (idev->dev->flags&IFF_POINTOPOINT)
2270                                                 continue;
2271                                         flag |= IFA_HOST;
2272                                 }
2273                                 if (idev->dev->flags&IFF_POINTOPOINT)
2274                                         plen = 64;
2275                                 else
2276                                         plen = 96;
2277
2278                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2279                                                     IFA_F_PERMANENT);
2280                                 if (!IS_ERR(ifp)) {
2281                                         spin_lock_bh(&ifp->lock);
2282                                         ifp->flags &= ~IFA_F_TENTATIVE;
2283                                         spin_unlock_bh(&ifp->lock);
2284                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2285                                         in6_ifa_put(ifp);
2286                                 }
2287                         }
2288                 }
2289         }
2290 }
2291 #endif
2292
2293 static void init_loopback(struct net_device *dev)
2294 {
2295         struct inet6_dev  *idev;
2296         struct inet6_ifaddr * ifp;
2297
2298         /* ::1 */
2299
2300         ASSERT_RTNL();
2301
2302         if ((idev = ipv6_find_idev(dev)) == NULL) {
2303                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2304                 return;
2305         }
2306
2307         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2308         if (!IS_ERR(ifp)) {
2309                 spin_lock_bh(&ifp->lock);
2310                 ifp->flags &= ~IFA_F_TENTATIVE;
2311                 spin_unlock_bh(&ifp->lock);
2312                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2313                 in6_ifa_put(ifp);
2314         }
2315 }
2316
2317 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2318 {
2319         struct inet6_ifaddr * ifp;
2320         u32 addr_flags = IFA_F_PERMANENT;
2321
2322 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2323         if (idev->cnf.optimistic_dad &&
2324             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2325                 addr_flags |= IFA_F_OPTIMISTIC;
2326 #endif
2327
2328
2329         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2330         if (!IS_ERR(ifp)) {
2331                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2332                 addrconf_dad_start(ifp, 0);
2333                 in6_ifa_put(ifp);
2334         }
2335 }
2336
2337 static void addrconf_dev_config(struct net_device *dev)
2338 {
2339         struct in6_addr addr;
2340         struct inet6_dev    * idev;
2341
2342         ASSERT_RTNL();
2343
2344         if ((dev->type != ARPHRD_ETHER) &&
2345             (dev->type != ARPHRD_FDDI) &&
2346             (dev->type != ARPHRD_IEEE802_TR) &&
2347             (dev->type != ARPHRD_ARCNET) &&
2348             (dev->type != ARPHRD_INFINIBAND)) {
2349                 /* Alas, we support only Ethernet autoconfiguration. */
2350                 return;
2351         }
2352
2353         idev = addrconf_add_dev(dev);
2354         if (idev == NULL)
2355                 return;
2356
2357         memset(&addr, 0, sizeof(struct in6_addr));
2358         addr.s6_addr32[0] = htonl(0xFE800000);
2359
2360         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2361                 addrconf_add_linklocal(idev, &addr);
2362 }
2363
2364 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2365 static void addrconf_sit_config(struct net_device *dev)
2366 {
2367         struct inet6_dev *idev;
2368
2369         ASSERT_RTNL();
2370
2371         /*
2372          * Configure the tunnel with one of our IPv4
2373          * addresses... we should configure all of
2374          * our v4 addrs in the tunnel
2375          */
2376
2377         if ((idev = ipv6_find_idev(dev)) == NULL) {
2378                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2379                 return;
2380         }
2381
2382         if (dev->priv_flags & IFF_ISATAP) {
2383                 struct in6_addr addr;
2384
2385                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2386                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2387                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2388                         addrconf_add_linklocal(idev, &addr);
2389                 return;
2390         }
2391
2392         sit_add_v4_addrs(idev);
2393
2394         if (dev->flags&IFF_POINTOPOINT) {
2395                 addrconf_add_mroute(dev);
2396                 addrconf_add_lroute(dev);
2397         } else
2398                 sit_route_add(dev);
2399 }
2400 #endif
2401
2402 static inline int
2403 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2404 {
2405         struct in6_addr lladdr;
2406
2407         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2408                 addrconf_add_linklocal(idev, &lladdr);
2409                 return 0;
2410         }
2411         return -1;
2412 }
2413
2414 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2415 {
2416         struct net_device *link_dev;
2417         struct net *net = dev_net(idev->dev);
2418
2419         /* first try to inherit the link-local address from the link device */
2420         if (idev->dev->iflink &&
2421             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2422                 if (!ipv6_inherit_linklocal(idev, link_dev))
2423                         return;
2424         }
2425         /* then try to inherit it from any device */
2426         for_each_netdev(net, link_dev) {
2427                 if (!ipv6_inherit_linklocal(idev, link_dev))
2428                         return;
2429         }
2430         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2431 }
2432
2433 /*
2434  * Autoconfigure tunnel with a link-local address so routing protocols,
2435  * DHCPv6, MLD etc. can be run over the virtual link
2436  */
2437
2438 static void addrconf_ip6_tnl_config(struct net_device *dev)
2439 {
2440         struct inet6_dev *idev;
2441
2442         ASSERT_RTNL();
2443
2444         if ((idev = addrconf_add_dev(dev)) == NULL) {
2445                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2446                 return;
2447         }
2448         ip6_tnl_add_linklocal(idev);
2449 }
2450
2451 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2452                            void * data)
2453 {
2454         struct net_device *dev = (struct net_device *) data;
2455         struct inet6_dev *idev = __in6_dev_get(dev);
2456         int run_pending = 0;
2457         int err;
2458
2459         switch(event) {
2460         case NETDEV_REGISTER:
2461                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2462                         idev = ipv6_add_dev(dev);
2463                         if (!idev)
2464                                 return notifier_from_errno(-ENOMEM);
2465                 }
2466                 break;
2467         case NETDEV_UP:
2468         case NETDEV_CHANGE:
2469                 if (dev->flags & IFF_SLAVE)
2470                         break;
2471
2472                 if (event == NETDEV_UP) {
2473                         if (!addrconf_qdisc_ok(dev)) {
2474                                 /* device is not ready yet. */
2475                                 printk(KERN_INFO
2476                                         "ADDRCONF(NETDEV_UP): %s: "
2477                                         "link is not ready\n",
2478                                         dev->name);
2479                                 break;
2480                         }
2481
2482                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2483                                 idev = ipv6_add_dev(dev);
2484
2485                         if (idev)
2486                                 idev->if_flags |= IF_READY;
2487                 } else {
2488                         if (!addrconf_qdisc_ok(dev)) {
2489                                 /* device is still not ready. */
2490                                 break;
2491                         }
2492
2493                         if (idev) {
2494                                 if (idev->if_flags & IF_READY) {
2495                                         /* device is already configured. */
2496                                         break;
2497                                 }
2498                                 idev->if_flags |= IF_READY;
2499                         }
2500
2501                         printk(KERN_INFO
2502                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2503                                         "link becomes ready\n",
2504                                         dev->name);
2505
2506                         run_pending = 1;
2507                 }
2508
2509                 switch(dev->type) {
2510 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2511                 case ARPHRD_SIT:
2512                         addrconf_sit_config(dev);
2513                         break;
2514 #endif
2515                 case ARPHRD_TUNNEL6:
2516                         addrconf_ip6_tnl_config(dev);
2517                         break;
2518                 case ARPHRD_LOOPBACK:
2519                         init_loopback(dev);
2520                         break;
2521
2522                 default:
2523                         addrconf_dev_config(dev);
2524                         break;
2525                 }
2526                 if (idev) {
2527                         if (run_pending)
2528                                 addrconf_dad_run(idev);
2529
2530                         /* If the MTU changed during the interface down, when the
2531                            interface up, the changed MTU must be reflected in the
2532                            idev as well as routers.
2533                          */
2534                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2535                                 rt6_mtu_change(dev, dev->mtu);
2536                                 idev->cnf.mtu6 = dev->mtu;
2537                         }
2538                         idev->tstamp = jiffies;
2539                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2540                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2541                            stop IPv6 on this interface.
2542                          */
2543                         if (dev->mtu < IPV6_MIN_MTU)
2544                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2545                 }
2546                 break;
2547
2548         case NETDEV_CHANGEMTU:
2549                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2550                         rt6_mtu_change(dev, dev->mtu);
2551                         idev->cnf.mtu6 = dev->mtu;
2552                         break;
2553                 }
2554
2555                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2556                         idev = ipv6_add_dev(dev);
2557                         if (idev)
2558                                 break;
2559                 }
2560
2561                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2562
2563         case NETDEV_DOWN:
2564         case NETDEV_UNREGISTER:
2565                 /*
2566                  *      Remove all addresses from this interface.
2567                  */
2568                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2569                 break;
2570
2571         case NETDEV_CHANGENAME:
2572                 if (idev) {
2573                         snmp6_unregister_dev(idev);
2574                         addrconf_sysctl_unregister(idev);
2575                         addrconf_sysctl_register(idev);
2576                         err = snmp6_register_dev(idev);
2577                         if (err)
2578                                 return notifier_from_errno(err);
2579                 }
2580                 break;
2581         }
2582
2583         return NOTIFY_OK;
2584 }
2585
2586 /*
2587  *      addrconf module should be notified of a device going up
2588  */
2589 static struct notifier_block ipv6_dev_notf = {
2590         .notifier_call = addrconf_notify,
2591         .priority = 0
2592 };
2593
2594 static int addrconf_ifdown(struct net_device *dev, int how)
2595 {
2596         struct inet6_dev *idev;
2597         struct inet6_ifaddr *ifa, **bifa;
2598         struct net *net = dev_net(dev);
2599         int i;
2600
2601         ASSERT_RTNL();
2602
2603         if ((dev->flags & IFF_LOOPBACK) && how == 1)
2604                 how = 0;
2605
2606         rt6_ifdown(net, dev);
2607         neigh_ifdown(&nd_tbl, dev);
2608
2609         idev = __in6_dev_get(dev);
2610         if (idev == NULL)
2611                 return -ENODEV;
2612
2613         /* Step 1: remove reference to ipv6 device from parent device.
2614                    Do not dev_put!
2615          */
2616         if (how) {
2617                 idev->dead = 1;
2618
2619                 /* protected by rtnl_lock */
2620                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2621
2622                 /* Step 1.5: remove snmp6 entry */
2623                 snmp6_unregister_dev(idev);
2624
2625         }
2626
2627         /* Step 2: clear hash table */
2628         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2629                 bifa = &inet6_addr_lst[i];
2630
2631                 write_lock_bh(&addrconf_hash_lock);
2632                 while ((ifa = *bifa) != NULL) {
2633                         if (ifa->idev == idev) {
2634                                 *bifa = ifa->lst_next;
2635                                 ifa->lst_next = NULL;
2636                                 addrconf_del_timer(ifa);
2637                                 in6_ifa_put(ifa);
2638                                 continue;
2639                         }
2640                         bifa = &ifa->lst_next;
2641                 }
2642                 write_unlock_bh(&addrconf_hash_lock);
2643         }
2644
2645         write_lock_bh(&idev->lock);
2646
2647         /* Step 3: clear flags for stateless addrconf */
2648         if (!how)
2649                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2650
2651         /* Step 4: clear address list */
2652 #ifdef CONFIG_IPV6_PRIVACY
2653         if (how && del_timer(&idev->regen_timer))
2654                 in6_dev_put(idev);
2655
2656         /* clear tempaddr list */
2657         while ((ifa = idev->tempaddr_list) != NULL) {
2658                 idev->tempaddr_list = ifa->tmp_next;
2659                 ifa->tmp_next = NULL;
2660                 ifa->dead = 1;
2661                 write_unlock_bh(&idev->lock);
2662                 spin_lock_bh(&ifa->lock);
2663
2664                 if (ifa->ifpub) {
2665                         in6_ifa_put(ifa->ifpub);
2666                         ifa->ifpub = NULL;
2667                 }
2668                 spin_unlock_bh(&ifa->lock);
2669                 in6_ifa_put(ifa);
2670                 write_lock_bh(&idev->lock);
2671         }
2672 #endif
2673         while ((ifa = idev->addr_list) != NULL) {
2674                 idev->addr_list = ifa->if_next;
2675                 ifa->if_next = NULL;
2676                 ifa->dead = 1;
2677                 addrconf_del_timer(ifa);
2678                 write_unlock_bh(&idev->lock);
2679
2680                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2681                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2682                 in6_ifa_put(ifa);
2683
2684                 write_lock_bh(&idev->lock);
2685         }
2686         write_unlock_bh(&idev->lock);
2687
2688         /* Step 5: Discard multicast list */
2689
2690         if (how)
2691                 ipv6_mc_destroy_dev(idev);
2692         else
2693                 ipv6_mc_down(idev);
2694
2695         idev->tstamp = jiffies;
2696
2697         /* Shot the device (if unregistered) */
2698
2699         if (how) {
2700                 addrconf_sysctl_unregister(idev);
2701                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2702                 neigh_ifdown(&nd_tbl, dev);
2703                 in6_dev_put(idev);
2704         }
2705         return 0;
2706 }
2707
2708 static void addrconf_rs_timer(unsigned long data)
2709 {
2710         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2711
2712         if (ifp->idev->cnf.forwarding)
2713                 goto out;
2714
2715         if (ifp->idev->if_flags & IF_RA_RCVD) {
2716                 /*
2717                  *      Announcement received after solicitation
2718                  *      was sent
2719                  */
2720                 goto out;
2721         }
2722
2723         spin_lock(&ifp->lock);
2724         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2725                 /* The wait after the last probe can be shorter */
2726                 addrconf_mod_timer(ifp, AC_RS,
2727                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2728                                    ifp->idev->cnf.rtr_solicit_delay :
2729                                    ifp->idev->cnf.rtr_solicit_interval);
2730                 spin_unlock(&ifp->lock);
2731
2732                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2733         } else {
2734                 spin_unlock(&ifp->lock);
2735                 /*
2736                  * Note: we do not support deprecated "all on-link"
2737                  * assumption any longer.
2738                  */
2739                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2740                        ifp->idev->dev->name);
2741         }
2742
2743 out:
2744         in6_ifa_put(ifp);
2745 }
2746
2747 /*
2748  *      Duplicate Address Detection
2749  */
2750 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2751 {
2752         unsigned long rand_num;
2753         struct inet6_dev *idev = ifp->idev;
2754
2755         if (ifp->flags & IFA_F_OPTIMISTIC)
2756                 rand_num = 0;
2757         else
2758                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2759
2760         ifp->probes = idev->cnf.dad_transmits;
2761         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2762 }
2763
2764 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2765 {
2766         struct inet6_dev *idev = ifp->idev;
2767         struct net_device *dev = idev->dev;
2768
2769         addrconf_join_solict(dev, &ifp->addr);
2770
2771         net_srandom(ifp->addr.s6_addr32[3]);
2772
2773         read_lock_bh(&idev->lock);
2774         if (ifp->dead)
2775                 goto out;
2776         spin_lock_bh(&ifp->lock);
2777
2778         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2779             idev->cnf.accept_dad < 1 ||
2780             !(ifp->flags&IFA_F_TENTATIVE) ||
2781             ifp->flags & IFA_F_NODAD) {
2782                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2783                 spin_unlock_bh(&ifp->lock);
2784                 read_unlock_bh(&idev->lock);
2785
2786                 addrconf_dad_completed(ifp);
2787                 return;
2788         }
2789
2790         if (!(idev->if_flags & IF_READY)) {
2791                 spin_unlock_bh(&ifp->lock);
2792                 read_unlock_bh(&idev->lock);
2793                 /*
2794                  * If the defice is not ready:
2795                  * - keep it tentative if it is a permanent address.
2796                  * - otherwise, kill it.
2797                  */
2798                 in6_ifa_hold(ifp);
2799                 addrconf_dad_stop(ifp);
2800                 return;
2801         }
2802
2803         /*
2804          * Optimistic nodes can start receiving
2805          * Frames right away
2806          */
2807         if(ifp->flags & IFA_F_OPTIMISTIC)
2808                 ip6_ins_rt(ifp->rt);
2809
2810         addrconf_dad_kick(ifp);
2811         spin_unlock_bh(&ifp->lock);
2812 out:
2813         read_unlock_bh(&idev->lock);
2814 }
2815
2816 static void addrconf_dad_timer(unsigned long data)
2817 {
2818         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2819         struct inet6_dev *idev = ifp->idev;
2820         struct in6_addr mcaddr;
2821
2822         read_lock_bh(&idev->lock);
2823         if (idev->dead) {
2824                 read_unlock_bh(&idev->lock);
2825                 goto out;
2826         }
2827         if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) {
2828                 read_unlock_bh(&idev->lock);
2829                 addrconf_dad_failure(ifp);
2830                 return;
2831         }
2832         spin_lock_bh(&ifp->lock);
2833         if (ifp->probes == 0) {
2834                 /*
2835                  * DAD was successful
2836                  */
2837
2838                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2839                 spin_unlock_bh(&ifp->lock);
2840                 read_unlock_bh(&idev->lock);
2841
2842                 addrconf_dad_completed(ifp);
2843
2844                 goto out;
2845         }
2846
2847         ifp->probes--;
2848         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2849         spin_unlock_bh(&ifp->lock);
2850         read_unlock_bh(&idev->lock);
2851
2852         /* send a neighbour solicitation for our addr */
2853         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2854         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2855 out:
2856         in6_ifa_put(ifp);
2857 }
2858
2859 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2860 {
2861         struct net_device *     dev = ifp->idev->dev;
2862
2863         /*
2864          *      Configure the address for reception. Now it is valid.
2865          */
2866
2867         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2868
2869         /* If added prefix is link local and forwarding is off,
2870            start sending router solicitations.
2871          */
2872
2873         if (ifp->idev->cnf.forwarding == 0 &&
2874             ifp->idev->cnf.rtr_solicits > 0 &&
2875             (dev->flags&IFF_LOOPBACK) == 0 &&
2876             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2877                 /*
2878                  *      If a host as already performed a random delay
2879                  *      [...] as part of DAD [...] there is no need
2880                  *      to delay again before sending the first RS
2881                  */
2882                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2883
2884                 spin_lock_bh(&ifp->lock);
2885                 ifp->probes = 1;
2886                 ifp->idev->if_flags |= IF_RS_SENT;
2887                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2888                 spin_unlock_bh(&ifp->lock);
2889         }
2890 }
2891
2892 static void addrconf_dad_run(struct inet6_dev *idev) {
2893         struct inet6_ifaddr *ifp;
2894
2895         read_lock_bh(&idev->lock);
2896         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2897                 spin_lock_bh(&ifp->lock);
2898                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2899                         spin_unlock_bh(&ifp->lock);
2900                         continue;
2901                 }
2902                 spin_unlock_bh(&ifp->lock);
2903                 addrconf_dad_kick(ifp);
2904         }
2905         read_unlock_bh(&idev->lock);
2906 }
2907
2908 #ifdef CONFIG_PROC_FS
2909 struct if6_iter_state {
2910         struct seq_net_private p;
2911         int bucket;
2912 };
2913
2914 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2915 {
2916         struct inet6_ifaddr *ifa = NULL;
2917         struct if6_iter_state *state = seq->private;
2918         struct net *net = seq_file_net(seq);
2919
2920         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2921                 ifa = inet6_addr_lst[state->bucket];
2922
2923                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2924                         ifa = ifa->lst_next;
2925                 if (ifa)
2926                         break;
2927         }
2928         return ifa;
2929 }
2930
2931 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2932 {
2933         struct if6_iter_state *state = seq->private;
2934         struct net *net = seq_file_net(seq);
2935
2936         ifa = ifa->lst_next;
2937 try_again:
2938         if (ifa) {
2939                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2940                         ifa = ifa->lst_next;
2941                         goto try_again;
2942                 }
2943         }
2944
2945         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2946                 ifa = inet6_addr_lst[state->bucket];
2947                 goto try_again;
2948         }
2949
2950         return ifa;
2951 }
2952
2953 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2954 {
2955         struct inet6_ifaddr *ifa = if6_get_first(seq);
2956
2957         if (ifa)
2958                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2959                         --pos;
2960         return pos ? NULL : ifa;
2961 }
2962
2963 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2964         __acquires(addrconf_hash_lock)
2965 {
2966         read_lock_bh(&addrconf_hash_lock);
2967         return if6_get_idx(seq, *pos);
2968 }
2969
2970 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2971 {
2972         struct inet6_ifaddr *ifa;
2973
2974         ifa = if6_get_next(seq, v);
2975         ++*pos;
2976         return ifa;
2977 }
2978
2979 static void if6_seq_stop(struct seq_file *seq, void *v)
2980         __releases(addrconf_hash_lock)
2981 {
2982         read_unlock_bh(&addrconf_hash_lock);
2983 }
2984
2985 static int if6_seq_show(struct seq_file *seq, void *v)
2986 {
2987         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2988         seq_printf(seq,
2989                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2990                    NIP6(ifp->addr),
2991                    ifp->idev->dev->ifindex,
2992                    ifp->prefix_len,
2993                    ifp->scope,
2994                    ifp->flags,
2995                    ifp->idev->dev->name);
2996         return 0;
2997 }
2998
2999 static const struct seq_operations if6_seq_ops = {
3000         .start  = if6_seq_start,
3001         .next   = if6_seq_next,
3002         .show   = if6_seq_show,
3003         .stop   = if6_seq_stop,
3004 };
3005
3006 static int if6_seq_open(struct inode *inode, struct file *file)
3007 {
3008         return seq_open_net(inode, file, &if6_seq_ops,
3009                             sizeof(struct if6_iter_state));
3010 }
3011
3012 static const struct file_operations if6_fops = {
3013         .owner          = THIS_MODULE,
3014         .open           = if6_seq_open,
3015         .read           = seq_read,
3016         .llseek         = seq_lseek,
3017         .release        = seq_release_net,
3018 };
3019
3020 static int if6_proc_net_init(struct net *net)
3021 {
3022         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3023                 return -ENOMEM;
3024         return 0;
3025 }
3026
3027 static void if6_proc_net_exit(struct net *net)
3028 {
3029        proc_net_remove(net, "if_inet6");
3030 }
3031
3032 static struct pernet_operations if6_proc_net_ops = {
3033        .init = if6_proc_net_init,
3034        .exit = if6_proc_net_exit,
3035 };
3036
3037 int __init if6_proc_init(void)
3038 {
3039         return register_pernet_subsys(&if6_proc_net_ops);
3040 }
3041
3042 void if6_proc_exit(void)
3043 {
3044         unregister_pernet_subsys(&if6_proc_net_ops);
3045 }
3046 #endif  /* CONFIG_PROC_FS */
3047
3048 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3049 /* Check if address is a home address configured on any interface. */
3050 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3051 {
3052         int ret = 0;
3053         struct inet6_ifaddr * ifp;
3054         u8 hash = ipv6_addr_hash(addr);
3055         read_lock_bh(&addrconf_hash_lock);
3056         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3057                 if (!net_eq(dev_net(ifp->idev->dev), net))
3058                         continue;
3059                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3060                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3061                         ret = 1;
3062                         break;
3063                 }
3064         }
3065         read_unlock_bh(&addrconf_hash_lock);
3066         return ret;
3067 }
3068 #endif
3069
3070 /*
3071  *      Periodic address status verification
3072  */
3073
3074 static void addrconf_verify(unsigned long foo)
3075 {
3076         struct inet6_ifaddr *ifp;
3077         unsigned long now, next;
3078         int i;
3079
3080         spin_lock_bh(&addrconf_verify_lock);
3081         now = jiffies;
3082         next = now + ADDR_CHECK_FREQUENCY;
3083
3084         del_timer(&addr_chk_timer);
3085
3086         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3087
3088 restart:
3089                 read_lock(&addrconf_hash_lock);
3090                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3091                         unsigned long age;
3092 #ifdef CONFIG_IPV6_PRIVACY
3093                         unsigned long regen_advance;
3094 #endif
3095
3096                         if (ifp->flags & IFA_F_PERMANENT)
3097                                 continue;
3098
3099                         spin_lock(&ifp->lock);
3100                         age = (now - ifp->tstamp) / HZ;
3101
3102 #ifdef CONFIG_IPV6_PRIVACY
3103                         regen_advance = ifp->idev->cnf.regen_max_retry *
3104                                         ifp->idev->cnf.dad_transmits *
3105                                         ifp->idev->nd_parms->retrans_time / HZ;
3106 #endif
3107
3108                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3109                             age >= ifp->valid_lft) {
3110                                 spin_unlock(&ifp->lock);
3111                                 in6_ifa_hold(ifp);
3112                                 read_unlock(&addrconf_hash_lock);
3113                                 ipv6_del_addr(ifp);
3114                                 goto restart;
3115                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3116                                 spin_unlock(&ifp->lock);
3117                                 continue;
3118                         } else if (age >= ifp->prefered_lft) {
3119                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3120                                 int deprecate = 0;
3121
3122                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3123                                         deprecate = 1;
3124                                         ifp->flags |= IFA_F_DEPRECATED;
3125                                 }
3126
3127                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3128                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3129
3130                                 spin_unlock(&ifp->lock);
3131
3132                                 if (deprecate) {
3133                                         in6_ifa_hold(ifp);
3134                                         read_unlock(&addrconf_hash_lock);
3135
3136                                         ipv6_ifa_notify(0, ifp);
3137                                         in6_ifa_put(ifp);
3138                                         goto restart;
3139                                 }
3140 #ifdef CONFIG_IPV6_PRIVACY
3141                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3142                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3143                                 if (age >= ifp->prefered_lft - regen_advance) {
3144                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3145                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3146                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3147                                         if (!ifp->regen_count && ifpub) {
3148                                                 ifp->regen_count++;
3149                                                 in6_ifa_hold(ifp);
3150                                                 in6_ifa_hold(ifpub);
3151                                                 spin_unlock(&ifp->lock);
3152                                                 read_unlock(&addrconf_hash_lock);
3153                                                 spin_lock(&ifpub->lock);
3154                                                 ifpub->regen_count = 0;
3155                                                 spin_unlock(&ifpub->lock);
3156                                                 ipv6_create_tempaddr(ifpub, ifp);
3157                                                 in6_ifa_put(ifpub);
3158                                                 in6_ifa_put(ifp);
3159                                                 goto restart;
3160                                         }
3161                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3162                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3163                                 spin_unlock(&ifp->lock);
3164 #endif
3165                         } else {
3166                                 /* ifp->prefered_lft <= ifp->valid_lft */
3167                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3168                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3169                                 spin_unlock(&ifp->lock);
3170                         }
3171                 }
3172                 read_unlock(&addrconf_hash_lock);
3173         }
3174
3175         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3176         add_timer(&addr_chk_timer);
3177         spin_unlock_bh(&addrconf_verify_lock);
3178 }
3179
3180 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3181 {
3182         struct in6_addr *pfx = NULL;
3183
3184         if (addr)
3185                 pfx = nla_data(addr);
3186
3187         if (local) {
3188                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3189                         pfx = NULL;
3190                 else
3191                         pfx = nla_data(local);
3192         }
3193
3194         return pfx;
3195 }
3196
3197 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3198         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3199         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3200         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3201 };
3202
3203 static int
3204 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3205 {
3206         struct net *net = sock_net(skb->sk);
3207         struct ifaddrmsg *ifm;
3208         struct nlattr *tb[IFA_MAX+1];
3209         struct in6_addr *pfx;
3210         int err;
3211
3212         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3213         if (err < 0)
3214                 return err;
3215
3216         ifm = nlmsg_data(nlh);
3217         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3218         if (pfx == NULL)
3219                 return -EINVAL;
3220
3221         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3222 }
3223
3224 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3225                              u32 prefered_lft, u32 valid_lft)
3226 {
3227         u32 flags;
3228         clock_t expires;
3229         unsigned long timeout;
3230
3231         if (!valid_lft || (prefered_lft > valid_lft))
3232                 return -EINVAL;
3233
3234         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3235         if (addrconf_finite_timeout(timeout)) {
3236                 expires = jiffies_to_clock_t(timeout * HZ);
3237                 valid_lft = timeout;
3238                 flags = RTF_EXPIRES;
3239         } else {
3240                 expires = 0;
3241                 flags = 0;
3242                 ifa_flags |= IFA_F_PERMANENT;
3243         }
3244
3245         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3246         if (addrconf_finite_timeout(timeout)) {
3247                 if (timeout == 0)
3248                         ifa_flags |= IFA_F_DEPRECATED;
3249                 prefered_lft = timeout;
3250         }
3251
3252         spin_lock_bh(&ifp->lock);
3253         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3254         ifp->tstamp = jiffies;
3255         ifp->valid_lft = valid_lft;
3256         ifp->prefered_lft = prefered_lft;
3257
3258         spin_unlock_bh(&ifp->lock);
3259         if (!(ifp->flags&IFA_F_TENTATIVE))
3260                 ipv6_ifa_notify(0, ifp);
3261
3262         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3263                               expires, flags);
3264         addrconf_verify(0);
3265
3266         return 0;
3267 }
3268
3269 static int
3270 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3271 {
3272         struct net *net = sock_net(skb->sk);
3273         struct ifaddrmsg *ifm;
3274         struct nlattr *tb[IFA_MAX+1];
3275         struct in6_addr *pfx;
3276         struct inet6_ifaddr *ifa;
3277         struct net_device *dev;
3278         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3279         u8 ifa_flags;
3280         int err;
3281
3282         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3283         if (err < 0)
3284                 return err;
3285
3286         ifm = nlmsg_data(nlh);
3287         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3288         if (pfx == NULL)
3289                 return -EINVAL;
3290
3291         if (tb[IFA_CACHEINFO]) {
3292                 struct ifa_cacheinfo *ci;
3293
3294                 ci = nla_data(tb[IFA_CACHEINFO]);
3295                 valid_lft = ci->ifa_valid;
3296                 preferred_lft = ci->ifa_prefered;
3297         } else {
3298                 preferred_lft = INFINITY_LIFE_TIME;
3299                 valid_lft = INFINITY_LIFE_TIME;
3300         }
3301
3302         dev =  __dev_get_by_index(net, ifm->ifa_index);
3303         if (dev == NULL)
3304                 return -ENODEV;
3305
3306         /* We ignore other flags so far. */
3307         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3308
3309         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3310         if (ifa == NULL) {
3311                 /*
3312                  * It would be best to check for !NLM_F_CREATE here but
3313                  * userspace alreay relies on not having to provide this.
3314                  */
3315                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3316                                       ifm->ifa_prefixlen, ifa_flags,
3317                                       preferred_lft, valid_lft);
3318         }
3319
3320         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3321             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3322                 err = -EEXIST;
3323         else
3324                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3325
3326         in6_ifa_put(ifa);
3327
3328         return err;
3329 }
3330
3331 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3332                           u8 scope, int ifindex)
3333 {
3334         struct ifaddrmsg *ifm;
3335
3336         ifm = nlmsg_data(nlh);
3337         ifm->ifa_family = AF_INET6;
3338         ifm->ifa_prefixlen = prefixlen;
3339         ifm->ifa_flags = flags;
3340         ifm->ifa_scope = scope;
3341         ifm->ifa_index = ifindex;
3342 }
3343
3344 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3345                          unsigned long tstamp, u32 preferred, u32 valid)
3346 {
3347         struct ifa_cacheinfo ci;
3348
3349         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3350                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3351         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3352                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3353         ci.ifa_prefered = preferred;
3354         ci.ifa_valid = valid;
3355
3356         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3357 }
3358
3359 static inline int rt_scope(int ifa_scope)
3360 {
3361         if (ifa_scope & IFA_HOST)
3362                 return RT_SCOPE_HOST;
3363         else if (ifa_scope & IFA_LINK)
3364                 return RT_SCOPE_LINK;
3365         else if (ifa_scope & IFA_SITE)
3366                 return RT_SCOPE_SITE;
3367         else
3368                 return RT_SCOPE_UNIVERSE;
3369 }
3370
3371 static inline int inet6_ifaddr_msgsize(void)
3372 {
3373         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3374                + nla_total_size(16) /* IFA_ADDRESS */
3375                + nla_total_size(sizeof(struct ifa_cacheinfo));
3376 }
3377
3378 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3379                              u32 pid, u32 seq, int event, unsigned int flags)
3380 {
3381         struct nlmsghdr  *nlh;
3382         u32 preferred, valid;
3383
3384         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3385         if (nlh == NULL)
3386                 return -EMSGSIZE;
3387
3388         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3389                       ifa->idev->dev->ifindex);
3390
3391         if (!(ifa->flags&IFA_F_PERMANENT)) {
3392                 preferred = ifa->prefered_lft;
3393                 valid = ifa->valid_lft;
3394                 if (preferred != INFINITY_LIFE_TIME) {
3395                         long tval = (jiffies - ifa->tstamp)/HZ;
3396                         preferred -= tval;
3397                         if (valid != INFINITY_LIFE_TIME)
3398                                 valid -= tval;
3399                 }
3400         } else {
3401                 preferred = INFINITY_LIFE_TIME;
3402                 valid = INFINITY_LIFE_TIME;
3403         }
3404
3405         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3406             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3407                 nlmsg_cancel(skb, nlh);
3408                 return -EMSGSIZE;
3409         }
3410
3411         return nlmsg_end(skb, nlh);
3412 }
3413
3414 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3415                                 u32 pid, u32 seq, int event, u16 flags)
3416 {
3417         struct nlmsghdr  *nlh;
3418         u8 scope = RT_SCOPE_UNIVERSE;
3419         int ifindex = ifmca->idev->dev->ifindex;
3420
3421         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3422                 scope = RT_SCOPE_SITE;
3423
3424         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3425         if (nlh == NULL)
3426                 return -EMSGSIZE;
3427
3428         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3429         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3430             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3431                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3432                 nlmsg_cancel(skb, nlh);
3433                 return -EMSGSIZE;
3434         }
3435
3436         return nlmsg_end(skb, nlh);
3437 }
3438
3439 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3440                                 u32 pid, u32 seq, int event, unsigned int flags)
3441 {
3442         struct nlmsghdr  *nlh;
3443         u8 scope = RT_SCOPE_UNIVERSE;
3444         int ifindex = ifaca->aca_idev->dev->ifindex;
3445
3446         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3447                 scope = RT_SCOPE_SITE;
3448
3449         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3450         if (nlh == NULL)
3451                 return -EMSGSIZE;
3452
3453         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3454         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3455             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3456                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3457                 nlmsg_cancel(skb, nlh);
3458                 return -EMSGSIZE;
3459         }
3460
3461         return nlmsg_end(skb, nlh);
3462 }
3463
3464 enum addr_type_t
3465 {
3466         UNICAST_ADDR,
3467         MULTICAST_ADDR,
3468         ANYCAST_ADDR,
3469 };
3470
3471 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3472                            enum addr_type_t type)
3473 {
3474         int idx, ip_idx;
3475         int s_idx, s_ip_idx;
3476         int err = 1;
3477         struct net_device *dev;
3478         struct inet6_dev *idev = NULL;
3479         struct inet6_ifaddr *ifa;
3480         struct ifmcaddr6 *ifmca;
3481         struct ifacaddr6 *ifaca;
3482         struct net *net = sock_net(skb->sk);
3483
3484         s_idx = cb->args[0];
3485         s_ip_idx = ip_idx = cb->args[1];
3486
3487         idx = 0;
3488         for_each_netdev(net, dev) {
3489                 if (idx < s_idx)
3490                         goto cont;
3491                 if (idx > s_idx)
3492                         s_ip_idx = 0;
3493                 ip_idx = 0;
3494                 if ((idev = in6_dev_get(dev)) == NULL)
3495                         goto cont;
3496                 read_lock_bh(&idev->lock);
3497                 switch (type) {
3498                 case UNICAST_ADDR:
3499                         /* unicast address incl. temp addr */
3500                         for (ifa = idev->addr_list; ifa;
3501                              ifa = ifa->if_next, ip_idx++) {
3502                                 if (ip_idx < s_ip_idx)
3503                                         continue;
3504                                 err = inet6_fill_ifaddr(skb, ifa,
3505                                                         NETLINK_CB(cb->skb).pid,
3506                                                         cb->nlh->nlmsg_seq,
3507                                                         RTM_NEWADDR,
3508                                                         NLM_F_MULTI);
3509                         }
3510                         break;
3511                 case MULTICAST_ADDR:
3512                         /* multicast address */
3513                         for (ifmca = idev->mc_list; ifmca;
3514                              ifmca = ifmca->next, ip_idx++) {
3515                                 if (ip_idx < s_ip_idx)
3516                                         continue;
3517                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3518                                                           NETLINK_CB(cb->skb).pid,
3519                                                           cb->nlh->nlmsg_seq,
3520                                                           RTM_GETMULTICAST,
3521                                                           NLM_F_MULTI);
3522                         }
3523                         break;
3524                 case ANYCAST_ADDR:
3525                         /* anycast address */
3526                         for (ifaca = idev->ac_list; ifaca;
3527                              ifaca = ifaca->aca_next, ip_idx++) {
3528                                 if (ip_idx < s_ip_idx)
3529                                         continue;
3530                                 err = inet6_fill_ifacaddr(skb, ifaca,
3531                                                           NETLINK_CB(cb->skb).pid,
3532                                                           cb->nlh->nlmsg_seq,
3533                                                           RTM_GETANYCAST,
3534                                                           NLM_F_MULTI);
3535                         }
3536                         break;
3537                 default:
3538                         break;
3539                 }
3540                 read_unlock_bh(&idev->lock);
3541                 in6_dev_put(idev);
3542
3543                 if (err <= 0)
3544                         break;
3545 cont:
3546                 idx++;
3547         }
3548         cb->args[0] = idx;
3549         cb->args[1] = ip_idx;
3550         return skb->len;
3551 }
3552
3553 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3554 {
3555         enum addr_type_t type = UNICAST_ADDR;
3556
3557         return inet6_dump_addr(skb, cb, type);
3558 }
3559
3560 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3561 {
3562         enum addr_type_t type = MULTICAST_ADDR;
3563
3564         return inet6_dump_addr(skb, cb, type);
3565 }
3566
3567
3568 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3569 {
3570         enum addr_type_t type = ANYCAST_ADDR;
3571
3572         return inet6_dump_addr(skb, cb, type);
3573 }
3574
3575 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3576                              void *arg)
3577 {
3578         struct net *net = sock_net(in_skb->sk);
3579         struct ifaddrmsg *ifm;
3580         struct nlattr *tb[IFA_MAX+1];
3581         struct in6_addr *addr = NULL;
3582         struct net_device *dev = NULL;
3583         struct inet6_ifaddr *ifa;
3584         struct sk_buff *skb;
3585         int err;
3586
3587         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3588         if (err < 0)
3589                 goto errout;
3590
3591         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3592         if (addr == NULL) {
3593                 err = -EINVAL;
3594                 goto errout;
3595         }
3596
3597         ifm = nlmsg_data(nlh);
3598         if (ifm->ifa_index)
3599                 dev = __dev_get_by_index(net, ifm->ifa_index);
3600
3601         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3602                 err = -EADDRNOTAVAIL;
3603                 goto errout;
3604         }
3605
3606         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3607                 err = -ENOBUFS;
3608                 goto errout_ifa;
3609         }
3610
3611         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3612                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3613         if (err < 0) {
3614                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3615                 WARN_ON(err == -EMSGSIZE);
3616                 kfree_skb(skb);
3617                 goto errout_ifa;
3618         }
3619         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3620 errout_ifa:
3621         in6_ifa_put(ifa);
3622 errout:
3623         return err;
3624 }
3625
3626 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3627 {
3628         struct sk_buff *skb;
3629         struct net *net = dev_net(ifa->idev->dev);
3630         int err = -ENOBUFS;
3631
3632         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3633         if (skb == NULL)
3634                 goto errout;
3635
3636         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3637         if (err < 0) {
3638                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3639                 WARN_ON(err == -EMSGSIZE);
3640                 kfree_skb(skb);
3641                 goto errout;
3642         }
3643         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3644 errout:
3645         if (err < 0)
3646                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3647 }
3648
3649 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3650                                 __s32 *array, int bytes)
3651 {
3652         BUG_ON(bytes < (DEVCONF_MAX * 4));
3653
3654         memset(array, 0, bytes);
3655         array[DEVCONF_FORWARDING] = cnf->forwarding;
3656         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3657         array[DEVCONF_MTU6] = cnf->mtu6;
3658         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3659         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3660         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3661         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3662         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3663         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3664         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3665         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3666 #ifdef CONFIG_IPV6_PRIVACY
3667         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3668         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3669         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3670         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3671         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3672 #endif
3673         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3674         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3675         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3676 #ifdef CONFIG_IPV6_ROUTER_PREF
3677         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3678         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3679 #ifdef CONFIG_IPV6_ROUTE_INFO
3680         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3681 #endif
3682 #endif
3683         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3684         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3685 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3686         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3687 #endif
3688 #ifdef CONFIG_IPV6_MROUTE
3689         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3690 #endif
3691         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3692         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3693 }
3694
3695 static inline size_t inet6_if_nlmsg_size(void)
3696 {
3697         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3698                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3699                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3700                + nla_total_size(4) /* IFLA_MTU */
3701                + nla_total_size(4) /* IFLA_LINK */
3702                + nla_total_size( /* IFLA_PROTINFO */
3703                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3704                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3705                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3706                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3707                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3708                  );
3709 }
3710
3711 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3712                                       int bytes)
3713 {
3714         int i;
3715         int pad = bytes - sizeof(u64) * items;
3716         BUG_ON(pad < 0);
3717
3718         /* Use put_unaligned() because stats may not be aligned for u64. */
3719         put_unaligned(items, &stats[0]);
3720         for (i = 1; i < items; i++)
3721                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3722
3723         memset(&stats[items], 0, pad);
3724 }
3725
3726 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3727                              int bytes)
3728 {
3729         switch(attrtype) {
3730         case IFLA_INET6_STATS:
3731                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3732                 break;
3733         case IFLA_INET6_ICMP6STATS:
3734                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3735                 break;
3736         }
3737 }
3738
3739 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3740                              u32 pid, u32 seq, int event, unsigned int flags)
3741 {
3742         struct net_device *dev = idev->dev;
3743         struct nlattr *nla;
3744         struct ifinfomsg *hdr;
3745         struct nlmsghdr *nlh;
3746         void *protoinfo;
3747         struct ifla_cacheinfo ci;
3748
3749         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3750         if (nlh == NULL)
3751                 return -EMSGSIZE;
3752
3753         hdr = nlmsg_data(nlh);
3754         hdr->ifi_family = AF_INET6;
3755         hdr->__ifi_pad = 0;
3756         hdr->ifi_type = dev->type;
3757         hdr->ifi_index = dev->ifindex;
3758         hdr->ifi_flags = dev_get_flags(dev);
3759         hdr->ifi_change = 0;
3760
3761         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3762
3763         if (dev->addr_len)
3764                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3765
3766         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3767         if (dev->ifindex != dev->iflink)
3768                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3769
3770         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3771         if (protoinfo == NULL)
3772                 goto nla_put_failure;
3773
3774         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3775
3776         ci.max_reasm_len = IPV6_MAXPLEN;
3777         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3778                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3779         ci.reachable_time = idev->nd_parms->reachable_time;
3780         ci.retrans_time = idev->nd_parms->retrans_time;
3781         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3782
3783         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3784         if (nla == NULL)
3785                 goto nla_put_failure;
3786         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3787
3788         /* XXX - MC not implemented */
3789
3790         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3791         if (nla == NULL)
3792                 goto nla_put_failure;
3793         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3794
3795         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3796         if (nla == NULL)
3797                 goto nla_put_failure;
3798         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3799
3800         nla_nest_end(skb, protoinfo);
3801         return nlmsg_end(skb, nlh);
3802
3803 nla_put_failure:
3804         nlmsg_cancel(skb, nlh);
3805         return -EMSGSIZE;
3806 }
3807
3808 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3809 {
3810         struct net *net = sock_net(skb->sk);
3811         int idx, err;
3812         int s_idx = cb->args[0];
3813         struct net_device *dev;
3814         struct inet6_dev *idev;
3815
3816         read_lock(&dev_base_lock);
3817         idx = 0;
3818         for_each_netdev(net, dev) {
3819                 if (idx < s_idx)
3820                         goto cont;
3821                 if ((idev = in6_dev_get(dev)) == NULL)
3822                         goto cont;
3823                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3824                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3825                 in6_dev_put(idev);
3826                 if (err <= 0)
3827                         break;
3828 cont:
3829                 idx++;
3830         }
3831         read_unlock(&dev_base_lock);
3832         cb->args[0] = idx;
3833
3834         return skb->len;
3835 }
3836
3837 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3838 {
3839         struct sk_buff *skb;
3840         struct net *net = dev_net(idev->dev);
3841         int err = -ENOBUFS;
3842
3843         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3844         if (skb == NULL)
3845                 goto errout;
3846
3847         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3848         if (err < 0) {
3849                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3850                 WARN_ON(err == -EMSGSIZE);
3851                 kfree_skb(skb);
3852                 goto errout;
3853         }
3854         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3855 errout:
3856         if (err < 0)
3857                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3858 }
3859
3860 static inline size_t inet6_prefix_nlmsg_size(void)
3861 {
3862         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3863                + nla_total_size(sizeof(struct in6_addr))
3864                + nla_total_size(sizeof(struct prefix_cacheinfo));
3865 }
3866
3867 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3868                              struct prefix_info *pinfo, u32 pid, u32 seq,
3869                              int event, unsigned int flags)
3870 {
3871         struct prefixmsg *pmsg;
3872         struct nlmsghdr *nlh;
3873         struct prefix_cacheinfo ci;
3874
3875         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3876         if (nlh == NULL)
3877                 return -EMSGSIZE;
3878
3879         pmsg = nlmsg_data(nlh);
3880         pmsg->prefix_family = AF_INET6;
3881         pmsg->prefix_pad1 = 0;
3882         pmsg->prefix_pad2 = 0;
3883         pmsg->prefix_ifindex = idev->dev->ifindex;
3884         pmsg->prefix_len = pinfo->prefix_len;
3885         pmsg->prefix_type = pinfo->type;
3886         pmsg->prefix_pad3 = 0;
3887         pmsg->prefix_flags = 0;
3888         if (pinfo->onlink)
3889                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3890         if (pinfo->autoconf)
3891                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3892
3893         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3894
3895         ci.preferred_time = ntohl(pinfo->prefered);
3896         ci.valid_time = ntohl(pinfo->valid);
3897         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3898
3899         return nlmsg_end(skb, nlh);
3900
3901 nla_put_failure:
3902         nlmsg_cancel(skb, nlh);
3903         return -EMSGSIZE;
3904 }
3905
3906 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3907                          struct prefix_info *pinfo)
3908 {
3909         struct sk_buff *skb;
3910         struct net *net = dev_net(idev->dev);
3911         int err = -ENOBUFS;
3912
3913         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3914         if (skb == NULL)
3915                 goto errout;
3916
3917         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3918         if (err < 0) {
3919                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3920                 WARN_ON(err == -EMSGSIZE);
3921                 kfree_skb(skb);
3922                 goto errout;
3923         }
3924         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3925 errout:
3926         if (err < 0)
3927                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3928 }
3929
3930 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3931 {
3932         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3933
3934         switch (event) {
3935         case RTM_NEWADDR:
3936                 /*
3937                  * If the address was optimistic
3938                  * we inserted the route at the start of
3939                  * our DAD process, so we don't need
3940                  * to do it again
3941                  */
3942                 if (!(ifp->rt->rt6i_node))
3943                         ip6_ins_rt(ifp->rt);
3944                 if (ifp->idev->cnf.forwarding)
3945                         addrconf_join_anycast(ifp);
3946                 break;
3947         case RTM_DELADDR:
3948                 if (ifp->idev->cnf.forwarding)
3949                         addrconf_leave_anycast(ifp);
3950                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3951                 dst_hold(&ifp->rt->u.dst);
3952                 if (ip6_del_rt(ifp->rt))
3953                         dst_free(&ifp->rt->u.dst);
3954                 break;
3955         }
3956 }
3957
3958 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3959 {
3960         rcu_read_lock_bh();
3961         if (likely(ifp->idev->dead == 0))
3962                 __ipv6_ifa_notify(event, ifp);
3963         rcu_read_unlock_bh();
3964 }
3965
3966 #ifdef CONFIG_SYSCTL
3967
3968 static
3969 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3970                            void __user *buffer, size_t *lenp, loff_t *ppos)
3971 {
3972         int *valp = ctl->data;
3973         int val = *valp;
3974         int ret;
3975
3976         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3977
3978         if (write)
3979                 addrconf_fixup_forwarding(ctl, valp, val);
3980         return ret;
3981 }
3982
3983 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3984                                             int __user *name, int nlen,
3985                                             void __user *oldval,
3986                                             size_t __user *oldlenp,
3987                                             void __user *newval, size_t newlen)
3988 {
3989         int *valp = table->data;
3990         int val = *valp;
3991         int new;
3992
3993         if (!newval || !newlen)
3994                 return 0;
3995         if (newlen != sizeof(int))
3996                 return -EINVAL;
3997         if (get_user(new, (int __user *)newval))
3998                 return -EFAULT;
3999         if (new == *valp)
4000                 return 0;
4001         if (oldval && oldlenp) {
4002                 size_t len;
4003                 if (get_user(len, oldlenp))
4004                         return -EFAULT;
4005                 if (len) {
4006                         if (len > table->maxlen)
4007                                 len = table->maxlen;
4008                         if (copy_to_user(oldval, valp, len))
4009                                 return -EFAULT;
4010                         if (put_user(len, oldlenp))
4011                                 return -EFAULT;
4012                 }
4013         }
4014
4015         *valp = new;
4016         addrconf_fixup_forwarding(table, valp, val);
4017         return 1;
4018 }
4019
4020 static struct addrconf_sysctl_table
4021 {
4022         struct ctl_table_header *sysctl_header;
4023         ctl_table addrconf_vars[DEVCONF_MAX+1];
4024         char *dev_name;
4025 } addrconf_sysctl __read_mostly = {
4026         .sysctl_header = NULL,
4027         .addrconf_vars = {
4028                 {
4029                         .ctl_name       =       NET_IPV6_FORWARDING,
4030                         .procname       =       "forwarding",
4031                         .data           =       &ipv6_devconf.forwarding,
4032                         .maxlen         =       sizeof(int),
4033                         .mode           =       0644,
4034                         .proc_handler   =       &addrconf_sysctl_forward,
4035                         .strategy       =       &addrconf_sysctl_forward_strategy,
4036                 },
4037                 {
4038                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
4039                         .procname       =       "hop_limit",
4040                         .data           =       &ipv6_devconf.hop_limit,
4041                         .maxlen         =       sizeof(int),
4042                         .mode           =       0644,
4043                         .proc_handler   =       proc_dointvec,
4044                 },
4045                 {
4046                         .ctl_name       =       NET_IPV6_MTU,
4047                         .procname       =       "mtu",
4048                         .data           =       &ipv6_devconf.mtu6,
4049                         .maxlen         =       sizeof(int),
4050                         .mode           =       0644,
4051                         .proc_handler   =       &proc_dointvec,
4052                 },
4053                 {
4054                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
4055                         .procname       =       "accept_ra",
4056                         .data           =       &ipv6_devconf.accept_ra,
4057                         .maxlen         =       sizeof(int),
4058                         .mode           =       0644,
4059                         .proc_handler   =       &proc_dointvec,
4060                 },
4061                 {
4062                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
4063                         .procname       =       "accept_redirects",
4064                         .data           =       &ipv6_devconf.accept_redirects,
4065                         .maxlen         =       sizeof(int),
4066                         .mode           =       0644,
4067                         .proc_handler   =       &proc_dointvec,
4068                 },
4069                 {
4070                         .ctl_name       =       NET_IPV6_AUTOCONF,
4071                         .procname       =       "autoconf",
4072                         .data           =       &ipv6_devconf.autoconf,
4073                         .maxlen         =       sizeof(int),
4074                         .mode           =       0644,
4075                         .proc_handler   =       &proc_dointvec,
4076                 },
4077                 {
4078                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
4079                         .procname       =       "dad_transmits",
4080                         .data           =       &ipv6_devconf.dad_transmits,
4081                         .maxlen         =       sizeof(int),
4082                         .mode           =       0644,
4083                         .proc_handler   =       &proc_dointvec,
4084                 },
4085                 {
4086                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
4087                         .procname       =       "router_solicitations",
4088                         .data           =       &ipv6_devconf.rtr_solicits,
4089                         .maxlen         =       sizeof(int),
4090                         .mode           =       0644,
4091                         .proc_handler   =       &proc_dointvec,
4092                 },
4093                 {
4094                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
4095                         .procname       =       "router_solicitation_interval",
4096                         .data           =       &ipv6_devconf.rtr_solicit_interval,
4097                         .maxlen         =       sizeof(int),
4098                         .mode           =       0644,
4099                         .proc_handler   =       &proc_dointvec_jiffies,
4100                         .strategy       =       &sysctl_jiffies,
4101                 },
4102                 {
4103                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
4104                         .procname       =       "router_solicitation_delay",
4105                         .data           =       &ipv6_devconf.rtr_solicit_delay,
4106                         .maxlen         =       sizeof(int),
4107                         .mode           =       0644,
4108                         .proc_handler   =       &proc_dointvec_jiffies,
4109                         .strategy       =       &sysctl_jiffies,
4110                 },
4111                 {
4112                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
4113                         .procname       =       "force_mld_version",
4114                         .data           =       &ipv6_devconf.force_mld_version,
4115                         .maxlen         =       sizeof(int),
4116                         .mode           =       0644,
4117                         .proc_handler   =       &proc_dointvec,
4118                 },
4119 #ifdef CONFIG_IPV6_PRIVACY
4120                 {
4121                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
4122                         .procname       =       "use_tempaddr",
4123                         .data           =       &ipv6_devconf.use_tempaddr,
4124                         .maxlen         =       sizeof(int),
4125                         .mode           =       0644,
4126                         .proc_handler   =       &proc_dointvec,
4127                 },
4128                 {
4129                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
4130                         .procname       =       "temp_valid_lft",
4131                         .data           =       &ipv6_devconf.temp_valid_lft,
4132                         .maxlen         =       sizeof(int),
4133                         .mode           =       0644,
4134                         .proc_handler   =       &proc_dointvec,
4135                 },
4136                 {
4137                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4138                         .procname       =       "temp_prefered_lft",
4139                         .data           =       &ipv6_devconf.temp_prefered_lft,
4140                         .maxlen         =       sizeof(int),
4141                         .mode           =       0644,
4142                         .proc_handler   =       &proc_dointvec,
4143                 },
4144                 {
4145                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4146                         .procname       =       "regen_max_retry",
4147                         .data           =       &ipv6_devconf.regen_max_retry,
4148                         .maxlen         =       sizeof(int),
4149                         .mode           =       0644,
4150                         .proc_handler   =       &proc_dointvec,
4151                 },
4152                 {
4153                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4154                         .procname       =       "max_desync_factor",
4155                         .data           =       &ipv6_devconf.max_desync_factor,
4156                         .maxlen         =       sizeof(int),
4157                         .mode           =       0644,
4158                         .proc_handler   =       &proc_dointvec,
4159                 },
4160 #endif
4161                 {
4162                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4163                         .procname       =       "max_addresses",
4164                         .data           =       &ipv6_devconf.max_addresses,
4165                         .maxlen         =       sizeof(int),
4166                         .mode           =       0644,
4167                         .proc_handler   =       &proc_dointvec,
4168                 },
4169                 {
4170                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4171                         .procname       =       "accept_ra_defrtr",
4172                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4173                         .maxlen         =       sizeof(int),
4174                         .mode           =       0644,
4175                         .proc_handler   =       &proc_dointvec,
4176                 },
4177                 {
4178                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4179                         .procname       =       "accept_ra_pinfo",
4180                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4181                         .maxlen         =       sizeof(int),
4182                         .mode           =       0644,
4183                         .proc_handler   =       &proc_dointvec,
4184                 },
4185 #ifdef CONFIG_IPV6_ROUTER_PREF
4186                 {
4187                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4188                         .procname       =       "accept_ra_rtr_pref",
4189                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4190                         .maxlen         =       sizeof(int),
4191                         .mode           =       0644,
4192                         .proc_handler   =       &proc_dointvec,
4193                 },
4194                 {
4195                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4196                         .procname       =       "router_probe_interval",
4197                         .data           =       &ipv6_devconf.rtr_probe_interval,
4198                         .maxlen         =       sizeof(int),
4199                         .mode           =       0644,
4200                         .proc_handler   =       &proc_dointvec_jiffies,
4201                         .strategy       =       &sysctl_jiffies,
4202                 },
4203 #ifdef CONFIG_IPV6_ROUTE_INFO
4204                 {
4205                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4206                         .procname       =       "accept_ra_rt_info_max_plen",
4207                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4208                         .maxlen         =       sizeof(int),
4209                         .mode           =       0644,
4210                         .proc_handler   =       &proc_dointvec,
4211                 },
4212 #endif
4213 #endif
4214                 {
4215                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4216                         .procname       =       "proxy_ndp",
4217                         .data           =       &ipv6_devconf.proxy_ndp,
4218                         .maxlen         =       sizeof(int),
4219                         .mode           =       0644,
4220                         .proc_handler   =       &proc_dointvec,
4221                 },
4222                 {
4223                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4224                         .procname       =       "accept_source_route",
4225                         .data           =       &ipv6_devconf.accept_source_route,
4226                         .maxlen         =       sizeof(int),
4227                         .mode           =       0644,
4228                         .proc_handler   =       &proc_dointvec,
4229                 },
4230 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4231                 {
4232                         .ctl_name       =       CTL_UNNUMBERED,
4233                         .procname       =       "optimistic_dad",
4234                         .data           =       &ipv6_devconf.optimistic_dad,
4235                         .maxlen         =       sizeof(int),
4236                         .mode           =       0644,
4237                         .proc_handler   =       &proc_dointvec,
4238
4239                 },
4240 #endif
4241 #ifdef CONFIG_IPV6_MROUTE
4242                 {
4243                         .ctl_name       =       CTL_UNNUMBERED,
4244                         .procname       =       "mc_forwarding",
4245                         .data           =       &ipv6_devconf.mc_forwarding,
4246                         .maxlen         =       sizeof(int),
4247                         .mode           =       0644,
4248                         .proc_handler   =       &proc_dointvec,
4249                 },
4250 #endif
4251                 {
4252                         .ctl_name       =       CTL_UNNUMBERED,
4253                         .procname       =       "disable_ipv6",
4254                         .data           =       &ipv6_devconf.disable_ipv6,
4255                         .maxlen         =       sizeof(int),
4256                         .mode           =       0644,
4257                         .proc_handler   =       &proc_dointvec,
4258                 },
4259                 {
4260                         .ctl_name       =       CTL_UNNUMBERED,
4261                         .procname       =       "accept_dad",
4262                         .data           =       &ipv6_devconf.accept_dad,
4263                         .maxlen         =       sizeof(int),
4264                         .mode           =       0644,
4265                         .proc_handler   =       &proc_dointvec,
4266                 },
4267                 {
4268                         .ctl_name       =       0,      /* sentinel */
4269                 }
4270         },
4271 };
4272
4273 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4274                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4275 {
4276         int i;
4277         struct addrconf_sysctl_table *t;
4278
4279 #define ADDRCONF_CTL_PATH_DEV   3
4280
4281         struct ctl_path addrconf_ctl_path[] = {
4282                 { .procname = "net", .ctl_name = CTL_NET, },
4283                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4284                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4285                 { /* to be set */ },
4286                 { },
4287         };
4288
4289
4290         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4291         if (t == NULL)
4292                 goto out;
4293
4294         for (i=0; t->addrconf_vars[i].data; i++) {
4295                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4296                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4297                 t->addrconf_vars[i].extra2 = net;
4298         }
4299
4300         /*
4301          * Make a copy of dev_name, because '.procname' is regarded as const
4302          * by sysctl and we wouldn't want anyone to change it under our feet
4303          * (see SIOCSIFNAME).
4304          */
4305         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4306         if (!t->dev_name)
4307                 goto free;
4308
4309         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4310         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4311
4312         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4313                         t->addrconf_vars);
4314         if (t->sysctl_header == NULL)
4315                 goto free_procname;
4316
4317         p->sysctl = t;
4318         return 0;
4319
4320 free_procname:
4321         kfree(t->dev_name);
4322 free:
4323         kfree(t);
4324 out:
4325         return -ENOBUFS;
4326 }
4327
4328 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4329 {
4330         struct addrconf_sysctl_table *t;
4331
4332         if (p->sysctl == NULL)
4333                 return;
4334
4335         t = p->sysctl;
4336         p->sysctl = NULL;
4337         unregister_sysctl_table(t->sysctl_header);
4338         kfree(t->dev_name);
4339         kfree(t);
4340 }
4341
4342 static void addrconf_sysctl_register(struct inet6_dev *idev)
4343 {
4344         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4345                               NET_IPV6_NEIGH, "ipv6",
4346                               &ndisc_ifinfo_sysctl_change,
4347                               ndisc_ifinfo_sysctl_strategy);
4348         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4349                         idev->dev->ifindex, idev, &idev->cnf);
4350 }
4351
4352 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4353 {
4354         __addrconf_sysctl_unregister(&idev->cnf);
4355         neigh_sysctl_unregister(idev->nd_parms);
4356 }
4357
4358
4359 #endif
4360
4361 static int addrconf_init_net(struct net *net)
4362 {
4363         int err;
4364         struct ipv6_devconf *all, *dflt;
4365
4366         err = -ENOMEM;
4367         all = &ipv6_devconf;
4368         dflt = &ipv6_devconf_dflt;
4369
4370         if (net != &init_net) {
4371                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4372                 if (all == NULL)
4373                         goto err_alloc_all;
4374
4375                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4376                 if (dflt == NULL)
4377                         goto err_alloc_dflt;
4378         }
4379
4380         net->ipv6.devconf_all = all;
4381         net->ipv6.devconf_dflt = dflt;
4382
4383 #ifdef CONFIG_SYSCTL
4384         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4385                         NULL, all);
4386         if (err < 0)
4387                 goto err_reg_all;
4388
4389         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4390                         NULL, dflt);
4391         if (err < 0)
4392                 goto err_reg_dflt;
4393 #endif
4394         return 0;
4395
4396 #ifdef CONFIG_SYSCTL
4397 err_reg_dflt:
4398         __addrconf_sysctl_unregister(all);
4399 err_reg_all:
4400         kfree(dflt);
4401 #endif
4402 err_alloc_dflt:
4403         kfree(all);
4404 err_alloc_all:
4405         return err;
4406 }
4407
4408 static void addrconf_exit_net(struct net *net)
4409 {
4410 #ifdef CONFIG_SYSCTL
4411         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4412         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4413 #endif
4414         if (net != &init_net) {
4415                 kfree(net->ipv6.devconf_dflt);
4416                 kfree(net->ipv6.devconf_all);
4417         }
4418 }
4419
4420 static struct pernet_operations addrconf_ops = {
4421         .init = addrconf_init_net,
4422         .exit = addrconf_exit_net,
4423 };
4424
4425 /*
4426  *      Device notifier
4427  */
4428
4429 int register_inet6addr_notifier(struct notifier_block *nb)
4430 {
4431         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4432 }
4433
4434 EXPORT_SYMBOL(register_inet6addr_notifier);
4435
4436 int unregister_inet6addr_notifier(struct notifier_block *nb)
4437 {
4438         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4439 }
4440
4441 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4442
4443 static void addrconf_net_exit(struct net *net)
4444 {
4445         struct net_device *dev;
4446
4447         rtnl_lock();
4448         /* clean dev list */
4449         for_each_netdev(net, dev) {
4450                 if (__in6_dev_get(dev) == NULL)
4451                         continue;
4452                 addrconf_ifdown(dev, 1);
4453         }
4454         addrconf_ifdown(net->loopback_dev, 2);
4455         rtnl_unlock();
4456 }
4457
4458 static struct pernet_operations addrconf_net_ops = {
4459         .exit = addrconf_net_exit,
4460 };
4461
4462 /*
4463  *      Init / cleanup code
4464  */
4465
4466 int __init addrconf_init(void)
4467 {
4468         int err;
4469
4470         if ((err = ipv6_addr_label_init()) < 0) {
4471                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4472                         err);
4473                 return err;
4474         }
4475
4476         register_pernet_subsys(&addrconf_ops);
4477
4478         /* The addrconf netdev notifier requires that loopback_dev
4479          * has it's ipv6 private information allocated and setup
4480          * before it can bring up and give link-local addresses
4481          * to other devices which are up.
4482          *
4483          * Unfortunately, loopback_dev is not necessarily the first
4484          * entry in the global dev_base list of net devices.  In fact,
4485          * it is likely to be the very last entry on that list.
4486          * So this causes the notifier registry below to try and
4487          * give link-local addresses to all devices besides loopback_dev
4488          * first, then loopback_dev, which cases all the non-loopback_dev
4489          * devices to fail to get a link-local address.
4490          *
4491          * So, as a temporary fix, allocate the ipv6 structure for
4492          * loopback_dev first by hand.
4493          * Longer term, all of the dependencies ipv6 has upon the loopback
4494          * device and it being up should be removed.
4495          */
4496         rtnl_lock();
4497         if (!ipv6_add_dev(init_net.loopback_dev))
4498                 err = -ENOMEM;
4499         rtnl_unlock();
4500         if (err)
4501                 goto errlo;
4502
4503         err = register_pernet_device(&addrconf_net_ops);
4504         if (err)
4505                 return err;
4506
4507         register_netdevice_notifier(&ipv6_dev_notf);
4508
4509         addrconf_verify(0);
4510
4511         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4512         if (err < 0)
4513                 goto errout;
4514
4515         /* Only the first call to __rtnl_register can fail */
4516         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4517         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4518         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4519         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4520         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4521
4522         ipv6_addr_label_rtnl_register();
4523
4524         return 0;
4525 errout:
4526         unregister_netdevice_notifier(&ipv6_dev_notf);
4527 errlo:
4528         unregister_pernet_subsys(&addrconf_ops);
4529
4530         return err;
4531 }
4532
4533 void addrconf_cleanup(void)
4534 {
4535         struct inet6_ifaddr *ifa;
4536         int i;
4537
4538         unregister_netdevice_notifier(&ipv6_dev_notf);
4539         unregister_pernet_device(&addrconf_net_ops);
4540
4541         unregister_pernet_subsys(&addrconf_ops);
4542
4543         rtnl_lock();
4544
4545         /*
4546          *      Check hash table.
4547          */
4548         write_lock_bh(&addrconf_hash_lock);
4549         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4550                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4551                         struct inet6_ifaddr *bifa;
4552
4553                         bifa = ifa;
4554                         ifa = ifa->lst_next;
4555                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4556                         /* Do not free it; something is wrong.
4557                            Now we can investigate it with debugger.
4558                          */
4559                 }
4560         }
4561         write_unlock_bh(&addrconf_hash_lock);
4562
4563         del_timer(&addr_chk_timer);
4564         rtnl_unlock();
4565
4566         unregister_pernet_subsys(&addrconf_net_ops);
4567 }