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   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      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/kernel.h>
  44 #include <linux/socket.h>
  45 #include <linux/sockios.h>
  46 #include <linux/net.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #ifdef CONFIG_SYSCTL
  57 #include <linux/sysctl.h>
  58 #endif
  59 #include <linux/capability.h>
  60 #include <linux/delay.h>
  61 #include <linux/notifier.h>
  62 #include <linux/string.h>
  63
  64 #include <net/net_namespace.h>
  65 #include <net/sock.h>
  66 #include <net/snmp.h>
  67
  68 #include <net/ipv6.h>
  69 #include <net/protocol.h>
  70 #include <net/ndisc.h>
  71 #include <net/ip6_route.h>
  72 #include <net/addrconf.h>
  73 #include <net/tcp.h>
  74 #include <net/ip.h>
  75 #include <net/netlink.h>
  76 #include <net/pkt_sched.h>
  77 #include <linux/if_tunnel.h>
  78 #include <linux/rtnetlink.h>
  79
  80 #ifdef CONFIG_IPV6_PRIVACY
  81 #include <linux/random.h>
  82 #endif
  83
  84 #include <asm/uaccess.h>
  85 #include <asm/unaligned.h>
  86
  87 #include <linux/proc_fs.h>
  88 #include <linux/seq_file.h>
  89
  90 /* Set to 3 to get tracing... */
  91 #define ACONF_DEBUG 2
  92
  93 #if ACONF_DEBUG >= 3
  94 #define ADBG(x) printk x
  95 #else
  96 #define ADBG(x)
  97 #endif
  98
  99 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 101
 102 #ifdef CONFIG_SYSCTL
 103 static void addrconf_sysctl_register(struct inet6_dev *idev);
 104 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 105 #else
 106 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 107 {
 108 }
 109
 110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 111 {
 112 }
 113 #endif
 114
 115 #ifdef CONFIG_IPV6_PRIVACY
 116 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 118 static void ipv6_regen_rndid(unsigned long data);
 119
 120 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 121 #endif
 122
 123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 124 static int ipv6_count_addresses(struct inet6_dev *idev);
 125
 126 /*
 127  *      Configured unicast address hash table
 128  */
 129 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 130 static DEFINE_RWLOCK(addrconf_hash_lock);
 131
 132 static void addrconf_verify(unsigned long);
 133
 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 135 static DEFINE_SPINLOCK(addrconf_verify_lock);
 136
 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 139
 140 static void addrconf_bonding_change(struct net_device *dev,
 141                                     unsigned long event);
 142 static int addrconf_ifdown(struct net_device *dev, int how);
 143
 144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 145 static void addrconf_dad_timer(unsigned long data);
 146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 147 static void addrconf_dad_run(struct inet6_dev *idev);
 148 static void addrconf_rs_timer(unsigned long data);
 149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 151
 152 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 153                                 struct prefix_info *pinfo);
 154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 155                               struct net_device *dev);
 156
 157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 158
 159 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 160         .forwarding             = 0,
 161         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 162         .mtu6                   = IPV6_MIN_MTU,
 163         .accept_ra              = 1,
 164         .accept_redirects       = 1,
 165         .autoconf               = 1,
 166         .force_mld_version      = 0,
 167         .dad_transmits          = 1,
 168         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 169         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 170         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 171 #ifdef CONFIG_IPV6_PRIVACY
 172         .use_tempaddr           = 0,
 173         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 174         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 175         .regen_max_retry        = REGEN_MAX_RETRY,
 176         .max_desync_factor      = MAX_DESYNC_FACTOR,
 177 #endif
 178         .max_addresses          = IPV6_MAX_ADDRESSES,
 179         .accept_ra_defrtr       = 1,
 180         .accept_ra_pinfo        = 1,
 181 #ifdef CONFIG_IPV6_ROUTER_PREF
 182         .accept_ra_rtr_pref     = 1,
 183         .rtr_probe_interval     = 60 * HZ,
 184 #ifdef CONFIG_IPV6_ROUTE_INFO
 185         .accept_ra_rt_info_max_plen = 0,
 186 #endif
 187 #endif
 188         .proxy_ndp              = 0,
 189         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 190         .disable_ipv6           = 0,
 191         .accept_dad             = 1,
 192 };
 193
 194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 195         .forwarding             = 0,
 196         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 197         .mtu6                   = IPV6_MIN_MTU,
 198         .accept_ra              = 1,
 199         .accept_redirects       = 1,
 200         .autoconf               = 1,
 201         .dad_transmits          = 1,
 202         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 203         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 204         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 205 #ifdef CONFIG_IPV6_PRIVACY
 206         .use_tempaddr           = 0,
 207         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 208         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 209         .regen_max_retry        = REGEN_MAX_RETRY,
 210         .max_desync_factor      = MAX_DESYNC_FACTOR,
 211 #endif
 212         .max_addresses          = IPV6_MAX_ADDRESSES,
 213         .accept_ra_defrtr       = 1,
 214         .accept_ra_pinfo        = 1,
 215 #ifdef CONFIG_IPV6_ROUTER_PREF
 216         .accept_ra_rtr_pref     = 1,
 217         .rtr_probe_interval     = 60 * HZ,
 218 #ifdef CONFIG_IPV6_ROUTE_INFO
 219         .accept_ra_rt_info_max_plen = 0,
 220 #endif
 221 #endif
 222         .proxy_ndp              = 0,
 223         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 224         .disable_ipv6           = 0,
 225         .accept_dad             = 1,
 226 };
 227
 228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 233
 234 /* Check if a valid qdisc is available */
 235 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 236 {
 237         return !qdisc_tx_is_noop(dev);
 238 }
 239
 240 /* Check if a route is valid prefix route */
 241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 242 {
 243         return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
 244 }
 245
 246 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 247 {
 248         if (del_timer(&ifp->timer))
 249                 __in6_ifa_put(ifp);
 250 }
 251
 252 enum addrconf_timer_t
 253 {
 254         AC_NONE,
 255         AC_DAD,
 256         AC_RS,
 257 };
 258
 259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 260                                enum addrconf_timer_t what,
 261                                unsigned long when)
 262 {
 263         if (!del_timer(&ifp->timer))
 264                 in6_ifa_hold(ifp);
 265
 266         switch (what) {
 267         case AC_DAD:
 268                 ifp->timer.function = addrconf_dad_timer;
 269                 break;
 270         case AC_RS:
 271                 ifp->timer.function = addrconf_rs_timer;
 272                 break;
 273         default:;
 274         }
 275         ifp->timer.expires = jiffies + when;
 276         add_timer(&ifp->timer);
 277 }
 278
 279 static int snmp6_alloc_dev(struct inet6_dev *idev)
 280 {
 281         if (snmp_mib_init((void **)idev->stats.ipv6,
 282                           sizeof(struct ipstats_mib)) < 0)
 283                 goto err_ip;
 284         if (snmp_mib_init((void **)idev->stats.icmpv6,
 285                           sizeof(struct icmpv6_mib)) < 0)
 286                 goto err_icmp;
 287         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 288                           sizeof(struct icmpv6msg_mib)) < 0)
 289                 goto err_icmpmsg;
 290
 291         return 0;
 292
 293 err_icmpmsg:
 294         snmp_mib_free((void **)idev->stats.icmpv6);
 295 err_icmp:
 296         snmp_mib_free((void **)idev->stats.ipv6);
 297 err_ip:
 298         return -ENOMEM;
 299 }
 300
 301 static void snmp6_free_dev(struct inet6_dev *idev)
 302 {
 303         snmp_mib_free((void **)idev->stats.icmpv6msg);
 304         snmp_mib_free((void **)idev->stats.icmpv6);
 305         snmp_mib_free((void **)idev->stats.ipv6);
 306 }
 307
 308 /* Nobody refers to this device, we may destroy it. */
 309
 310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 311 {
 312         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 313         kfree(idev);
 314 }
 315
 316 void in6_dev_finish_destroy(struct inet6_dev *idev)
 317 {
 318         struct net_device *dev = idev->dev;
 319
 320         WARN_ON(idev->addr_list != NULL);
 321         WARN_ON(idev->mc_list != NULL);
 322
 323 #ifdef NET_REFCNT_DEBUG
 324         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 325 #endif
 326         dev_put(dev);
 327         if (!idev->dead) {
 328                 printk("Freeing alive inet6 device %p\n", idev);
 329                 return;
 330         }
 331         snmp6_free_dev(idev);
 332         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 333 }
 334
 335 EXPORT_SYMBOL(in6_dev_finish_destroy);
 336
 337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 338 {
 339         struct inet6_dev *ndev;
 340
 341         ASSERT_RTNL();
 342
 343         if (dev->mtu < IPV6_MIN_MTU)
 344                 return NULL;
 345
 346         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 347
 348         if (ndev == NULL)
 349                 return NULL;
 350
 351         rwlock_init(&ndev->lock);
 352         ndev->dev = dev;
 353         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 354         ndev->cnf.mtu6 = dev->mtu;
 355         ndev->cnf.sysctl = NULL;
 356         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 357         if (ndev->nd_parms == NULL) {
 358                 kfree(ndev);
 359                 return NULL;
 360         }
 361         if (ndev->cnf.forwarding)
 362                 dev_disable_lro(dev);
 363         /* We refer to the device */
 364         dev_hold(dev);
 365
 366         if (snmp6_alloc_dev(ndev) < 0) {
 367                 ADBG((KERN_WARNING
 368                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 369                         __func__, dev->name));
 370                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 371                 ndev->dead = 1;
 372                 in6_dev_finish_destroy(ndev);
 373                 return NULL;
 374         }
 375
 376         if (snmp6_register_dev(ndev) < 0) {
 377                 ADBG((KERN_WARNING
 378                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 379                         __func__, dev->name));
 380                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 381                 ndev->dead = 1;
 382                 in6_dev_finish_destroy(ndev);
 383                 return NULL;
 384         }
 385
 386         /* One reference from device.  We must do this before
 387          * we invoke __ipv6_regen_rndid().
 388          */
 389         in6_dev_hold(ndev);
 390
 391         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 392                 ndev->cnf.accept_dad = -1;
 393
 394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 395         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 396                 printk(KERN_INFO
 397                        "%s: Disabled Multicast RS\n",
 398                        dev->name);
 399                 ndev->cnf.rtr_solicits = 0;
 400         }
 401 #endif
 402
 403 #ifdef CONFIG_IPV6_PRIVACY
 404         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 405         if ((dev->flags&IFF_LOOPBACK) ||
 406             dev->type == ARPHRD_TUNNEL ||
 407             dev->type == ARPHRD_TUNNEL6 ||
 408             dev->type == ARPHRD_SIT ||
 409             dev->type == ARPHRD_NONE) {
 410                 printk(KERN_INFO
 411                        "%s: Disabled Privacy Extensions\n",
 412                        dev->name);
 413                 ndev->cnf.use_tempaddr = -1;
 414         } else {
 415                 in6_dev_hold(ndev);
 416                 ipv6_regen_rndid((unsigned long) ndev);
 417         }
 418 #endif
 419
 420         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 421                 ndev->if_flags |= IF_READY;
 422
 423         ipv6_mc_init_dev(ndev);
 424         ndev->tstamp = jiffies;
 425         addrconf_sysctl_register(ndev);
 426         /* protected by rtnl_lock */
 427         rcu_assign_pointer(dev->ip6_ptr, ndev);
 428
 429         /* Join all-node multicast group */
 430         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 431
 432         return ndev;
 433 }
 434
 435 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 436 {
 437         struct inet6_dev *idev;
 438
 439         ASSERT_RTNL();
 440
 441         if ((idev = __in6_dev_get(dev)) == NULL) {
 442                 if ((idev = ipv6_add_dev(dev)) == NULL)
 443                         return NULL;
 444         }
 445
 446         if (dev->flags&IFF_UP)
 447                 ipv6_mc_up(idev);
 448         return idev;
 449 }
 450
 451 #ifdef CONFIG_SYSCTL
 452 static void dev_forward_change(struct inet6_dev *idev)
 453 {
 454         struct net_device *dev;
 455         struct inet6_ifaddr *ifa;
 456
 457         if (!idev)
 458                 return;
 459         dev = idev->dev;
 460         if (idev->cnf.forwarding)
 461                 dev_disable_lro(dev);
 462         if (dev && (dev->flags & IFF_MULTICAST)) {
 463                 if (idev->cnf.forwarding)
 464                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 465                 else
 466                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 467         }
 468         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 469                 if (ifa->flags&IFA_F_TENTATIVE)
 470                         continue;
 471                 if (idev->cnf.forwarding)
 472                         addrconf_join_anycast(ifa);
 473                 else
 474                         addrconf_leave_anycast(ifa);
 475         }
 476 }
 477
 478
 479 static void addrconf_forward_change(struct net *net, __s32 newf)
 480 {
 481         struct net_device *dev;
 482         struct inet6_dev *idev;
 483
 484         read_lock(&dev_base_lock);
 485         for_each_netdev(net, dev) {
 486                 rcu_read_lock();
 487                 idev = __in6_dev_get(dev);
 488                 if (idev) {
 489                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 490                         idev->cnf.forwarding = newf;
 491                         if (changed)
 492                                 dev_forward_change(idev);
 493                 }
 494                 rcu_read_unlock();
 495         }
 496         read_unlock(&dev_base_lock);
 497 }
 498
 499 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 500 {
 501         struct net *net;
 502
 503         net = (struct net *)table->extra2;
 504         if (p == &net->ipv6.devconf_dflt->forwarding)
 505                 return 0;
 506
 507         if (!rtnl_trylock())
 508                 return restart_syscall();
 509
 510         if (p == &net->ipv6.devconf_all->forwarding) {
 511                 __s32 newf = net->ipv6.devconf_all->forwarding;
 512                 net->ipv6.devconf_dflt->forwarding = newf;
 513                 addrconf_forward_change(net, newf);
 514         } else if ((!*p) ^ (!old))
 515                 dev_forward_change((struct inet6_dev *)table->extra1);
 516         rtnl_unlock();
 517
 518         if (*p)
 519                 rt6_purge_dflt_routers(net);
 520         return 1;
 521 }
 522 #endif
 523
 524 /* Nobody refers to this ifaddr, destroy it */
 525
 526 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 527 {
 528         WARN_ON(ifp->if_next != NULL);
 529         WARN_ON(ifp->lst_next != NULL);
 530
 531 #ifdef NET_REFCNT_DEBUG
 532         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 533 #endif
 534
 535         in6_dev_put(ifp->idev);
 536
 537         if (del_timer(&ifp->timer))
 538                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 539
 540         if (!ifp->dead) {
 541                 printk("Freeing alive inet6 address %p\n", ifp);
 542                 return;
 543         }
 544         dst_release(&ifp->rt->u.dst);
 545
 546         kfree(ifp);
 547 }
 548
 549 static void
 550 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 551 {
 552         struct inet6_ifaddr *ifa, **ifap;
 553         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 554
 555         /*
 556          * Each device address list is sorted in order of scope -
 557          * global before linklocal.
 558          */
 559         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 560              ifap = &ifa->if_next) {
 561                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 562                         break;
 563         }
 564
 565         ifp->if_next = *ifap;
 566         *ifap = ifp;
 567 }
 568
 569 /*
 570  *      Hash function taken from net_alias.c
 571  */
 572 static u8 ipv6_addr_hash(const struct in6_addr *addr)
 573 {
 574         __u32 word;
 575
 576         /*
 577          * We perform the hash function over the last 64 bits of the address
 578          * This will include the IEEE address token on links that support it.
 579          */
 580
 581         word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
 582         word ^= (word >> 16);
 583         word ^= (word >> 8);
 584
 585         return ((word ^ (word >> 4)) & 0x0f);
 586 }
 587
 588 /* On success it returns ifp with increased reference count */
 589
 590 static struct inet6_ifaddr *
 591 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 592               int scope, u32 flags)
 593 {
 594         struct inet6_ifaddr *ifa = NULL;
 595         struct rt6_info *rt;
 596         int hash;
 597         int err = 0;
 598         int addr_type = ipv6_addr_type(addr);
 599
 600         if (addr_type == IPV6_ADDR_ANY ||
 601             addr_type & IPV6_ADDR_MULTICAST ||
 602             (!(idev->dev->flags & IFF_LOOPBACK) &&
 603              addr_type & IPV6_ADDR_LOOPBACK))
 604                 return ERR_PTR(-EADDRNOTAVAIL);
 605
 606         rcu_read_lock_bh();
 607         if (idev->dead) {
 608                 err = -ENODEV;                  /*XXX*/
 609                 goto out2;
 610         }
 611
 612         if (idev->cnf.disable_ipv6) {
 613                 err = -EACCES;
 614                 goto out2;
 615         }
 616
 617         write_lock(&addrconf_hash_lock);
 618
 619         /* Ignore adding duplicate addresses on an interface */
 620         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 621                 ADBG(("ipv6_add_addr: already assigned\n"));
 622                 err = -EEXIST;
 623                 goto out;
 624         }
 625
 626         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 627
 628         if (ifa == NULL) {
 629                 ADBG(("ipv6_add_addr: malloc failed\n"));
 630                 err = -ENOBUFS;
 631                 goto out;
 632         }
 633
 634         rt = addrconf_dst_alloc(idev, addr, 0);
 635         if (IS_ERR(rt)) {
 636                 err = PTR_ERR(rt);
 637                 goto out;
 638         }
 639
 640         ipv6_addr_copy(&ifa->addr, addr);
 641
 642         spin_lock_init(&ifa->lock);
 643         init_timer(&ifa->timer);
 644         ifa->timer.data = (unsigned long) ifa;
 645         ifa->scope = scope;
 646         ifa->prefix_len = pfxlen;
 647         ifa->flags = flags | IFA_F_TENTATIVE;
 648         ifa->cstamp = ifa->tstamp = jiffies;
 649
 650         ifa->rt = rt;
 651
 652         /*
 653          * part one of RFC 4429, section 3.3
 654          * We should not configure an address as
 655          * optimistic if we do not yet know the link
 656          * layer address of our nexhop router
 657          */
 658
 659         if (rt->rt6i_nexthop == NULL)
 660                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 661
 662         ifa->idev = idev;
 663         in6_dev_hold(idev);
 664         /* For caller */
 665         in6_ifa_hold(ifa);
 666
 667         /* Add to big hash table */
 668         hash = ipv6_addr_hash(addr);
 669
 670         ifa->lst_next = inet6_addr_lst[hash];
 671         inet6_addr_lst[hash] = ifa;
 672         in6_ifa_hold(ifa);
 673         write_unlock(&addrconf_hash_lock);
 674
 675         write_lock(&idev->lock);
 676         /* Add to inet6_dev unicast addr list. */
 677         ipv6_link_dev_addr(idev, ifa);
 678
 679 #ifdef CONFIG_IPV6_PRIVACY
 680         if (ifa->flags&IFA_F_TEMPORARY) {
 681                 ifa->tmp_next = idev->tempaddr_list;
 682                 idev->tempaddr_list = ifa;
 683                 in6_ifa_hold(ifa);
 684         }
 685 #endif
 686
 687         in6_ifa_hold(ifa);
 688         write_unlock(&idev->lock);
 689 out2:
 690         rcu_read_unlock_bh();
 691
 692         if (likely(err == 0))
 693                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 694         else {
 695                 kfree(ifa);
 696                 ifa = ERR_PTR(err);
 697         }
 698
 699         return ifa;
 700 out:
 701         write_unlock(&addrconf_hash_lock);
 702         goto out2;
 703 }
 704
 705 /* This function wants to get referenced ifp and releases it before return */
 706
 707 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 708 {
 709         struct inet6_ifaddr *ifa, **ifap;
 710         struct inet6_dev *idev = ifp->idev;
 711         int hash;
 712         int deleted = 0, onlink = 0;
 713         unsigned long expires = jiffies;
 714
 715         hash = ipv6_addr_hash(&ifp->addr);
 716
 717         ifp->dead = 1;
 718
 719         write_lock_bh(&addrconf_hash_lock);
 720         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 721              ifap = &ifa->lst_next) {
 722                 if (ifa == ifp) {
 723                         *ifap = ifa->lst_next;
 724                         __in6_ifa_put(ifp);
 725                         ifa->lst_next = NULL;
 726                         break;
 727                 }
 728         }
 729         write_unlock_bh(&addrconf_hash_lock);
 730
 731         write_lock_bh(&idev->lock);
 732 #ifdef CONFIG_IPV6_PRIVACY
 733         if (ifp->flags&IFA_F_TEMPORARY) {
 734                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 735                      ifap = &ifa->tmp_next) {
 736                         if (ifa == ifp) {
 737                                 *ifap = ifa->tmp_next;
 738                                 if (ifp->ifpub) {
 739                                         in6_ifa_put(ifp->ifpub);
 740                                         ifp->ifpub = NULL;
 741                                 }
 742                                 __in6_ifa_put(ifp);
 743                                 ifa->tmp_next = NULL;
 744                                 break;
 745                         }
 746                 }
 747         }
 748 #endif
 749
 750         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 751                 if (ifa == ifp) {
 752                         *ifap = ifa->if_next;
 753                         __in6_ifa_put(ifp);
 754                         ifa->if_next = NULL;
 755                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 756                                 break;
 757                         deleted = 1;
 758                         continue;
 759                 } else if (ifp->flags & IFA_F_PERMANENT) {
 760                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 761                                               ifp->prefix_len)) {
 762                                 if (ifa->flags & IFA_F_PERMANENT) {
 763                                         onlink = 1;
 764                                         if (deleted)
 765                                                 break;
 766                                 } else {
 767                                         unsigned long lifetime;
 768
 769                                         if (!onlink)
 770                                                 onlink = -1;
 771
 772                                         spin_lock(&ifa->lock);
 773
 774                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 775                                         /*
 776                                          * Note: Because this address is
 777                                          * not permanent, lifetime <
 778                                          * LONG_MAX / HZ here.
 779                                          */
 780                                         if (time_before(expires,
 781                                                         ifa->tstamp + lifetime * HZ))
 782                                                 expires = ifa->tstamp + lifetime * HZ;
 783                                         spin_unlock(&ifa->lock);
 784                                 }
 785                         }
 786                 }
 787                 ifap = &ifa->if_next;
 788         }
 789         write_unlock_bh(&idev->lock);
 790
 791         addrconf_del_timer(ifp);
 792
 793         ipv6_ifa_notify(RTM_DELADDR, ifp);
 794
 795         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 796
 797         /*
 798          * Purge or update corresponding prefix
 799          *
 800          * 1) we don't purge prefix here if address was not permanent.
 801          *    prefix is managed by its own lifetime.
 802          * 2) if there're no addresses, delete prefix.
 803          * 3) if there're still other permanent address(es),
 804          *    corresponding prefix is still permanent.
 805          * 4) otherwise, update prefix lifetime to the
 806          *    longest valid lifetime among the corresponding
 807          *    addresses on the device.
 808          *    Note: subsequent RA will update lifetime.
 809          *
 810          * --yoshfuji
 811          */
 812         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 813                 struct in6_addr prefix;
 814                 struct rt6_info *rt;
 815                 struct net *net = dev_net(ifp->idev->dev);
 816                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 817                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 818
 819                 if (rt && addrconf_is_prefix_route(rt)) {
 820                         if (onlink == 0) {
 821                                 ip6_del_rt(rt);
 822                                 rt = NULL;
 823                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 824                                 rt->rt6i_expires = expires;
 825                                 rt->rt6i_flags |= RTF_EXPIRES;
 826                         }
 827                 }
 828                 dst_release(&rt->u.dst);
 829         }
 830
 831         in6_ifa_put(ifp);
 832 }
 833
 834 #ifdef CONFIG_IPV6_PRIVACY
 835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 836 {
 837         struct inet6_dev *idev = ifp->idev;
 838         struct in6_addr addr, *tmpaddr;
 839         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 840         unsigned long regen_advance;
 841         int tmp_plen;
 842         int ret = 0;
 843         int max_addresses;
 844         u32 addr_flags;
 845
 846         write_lock(&idev->lock);
 847         if (ift) {
 848                 spin_lock_bh(&ift->lock);
 849                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 850                 spin_unlock_bh(&ift->lock);
 851                 tmpaddr = &addr;
 852         } else {
 853                 tmpaddr = NULL;
 854         }
 855 retry:
 856         in6_dev_hold(idev);
 857         if (idev->cnf.use_tempaddr <= 0) {
 858                 write_unlock(&idev->lock);
 859                 printk(KERN_INFO
 860                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 861                 in6_dev_put(idev);
 862                 ret = -1;
 863                 goto out;
 864         }
 865         spin_lock_bh(&ifp->lock);
 866         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 867                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 868                 spin_unlock_bh(&ifp->lock);
 869                 write_unlock(&idev->lock);
 870                 printk(KERN_WARNING
 871                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 872                 in6_dev_put(idev);
 873                 ret = -1;
 874                 goto out;
 875         }
 876         in6_ifa_hold(ifp);
 877         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 878         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 879                 spin_unlock_bh(&ifp->lock);
 880                 write_unlock(&idev->lock);
 881                 printk(KERN_WARNING
 882                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 883                 in6_ifa_put(ifp);
 884                 in6_dev_put(idev);
 885                 ret = -1;
 886                 goto out;
 887         }
 888         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 889         tmp_valid_lft = min_t(__u32,
 890                               ifp->valid_lft,
 891                               idev->cnf.temp_valid_lft);
 892         tmp_prefered_lft = min_t(__u32,
 893                                  ifp->prefered_lft,
 894                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 895         tmp_plen = ifp->prefix_len;
 896         max_addresses = idev->cnf.max_addresses;
 897         tmp_cstamp = ifp->cstamp;
 898         tmp_tstamp = ifp->tstamp;
 899         spin_unlock_bh(&ifp->lock);
 900
 901         regen_advance = idev->cnf.regen_max_retry *
 902                         idev->cnf.dad_transmits *
 903                         idev->nd_parms->retrans_time / HZ;
 904         write_unlock(&idev->lock);
 905
 906         /* A temporary address is created only if this calculated Preferred
 907          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 908          * an implementation must not create a temporary address with a zero
 909          * Preferred Lifetime.
 910          */
 911         if (tmp_prefered_lft <= regen_advance) {
 912                 in6_ifa_put(ifp);
 913                 in6_dev_put(idev);
 914                 ret = -1;
 915                 goto out;
 916         }
 917
 918         addr_flags = IFA_F_TEMPORARY;
 919         /* set in addrconf_prefix_rcv() */
 920         if (ifp->flags & IFA_F_OPTIMISTIC)
 921                 addr_flags |= IFA_F_OPTIMISTIC;
 922
 923         ift = !max_addresses ||
 924               ipv6_count_addresses(idev) < max_addresses ?
 925                 ipv6_add_addr(idev, &addr, tmp_plen,
 926                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 927                               addr_flags) : NULL;
 928         if (!ift || IS_ERR(ift)) {
 929                 in6_ifa_put(ifp);
 930                 in6_dev_put(idev);
 931                 printk(KERN_INFO
 932                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 933                 tmpaddr = &addr;
 934                 write_lock(&idev->lock);
 935                 goto retry;
 936         }
 937
 938         spin_lock_bh(&ift->lock);
 939         ift->ifpub = ifp;
 940         ift->valid_lft = tmp_valid_lft;
 941         ift->prefered_lft = tmp_prefered_lft;
 942         ift->cstamp = tmp_cstamp;
 943         ift->tstamp = tmp_tstamp;
 944         spin_unlock_bh(&ift->lock);
 945
 946         addrconf_dad_start(ift, 0);
 947         in6_ifa_put(ift);
 948         in6_dev_put(idev);
 949 out:
 950         return ret;
 951 }
 952 #endif
 953
 954 /*
 955  *      Choose an appropriate source address (RFC3484)
 956  */
 957 enum {
 958         IPV6_SADDR_RULE_INIT = 0,
 959         IPV6_SADDR_RULE_LOCAL,
 960         IPV6_SADDR_RULE_SCOPE,
 961         IPV6_SADDR_RULE_PREFERRED,
 962 #ifdef CONFIG_IPV6_MIP6
 963         IPV6_SADDR_RULE_HOA,
 964 #endif
 965         IPV6_SADDR_RULE_OIF,
 966         IPV6_SADDR_RULE_LABEL,
 967 #ifdef CONFIG_IPV6_PRIVACY
 968         IPV6_SADDR_RULE_PRIVACY,
 969 #endif
 970         IPV6_SADDR_RULE_ORCHID,
 971         IPV6_SADDR_RULE_PREFIX,
 972         IPV6_SADDR_RULE_MAX
 973 };
 974
 975 struct ipv6_saddr_score {
 976         int                     rule;
 977         int                     addr_type;
 978         struct inet6_ifaddr     *ifa;
 979         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 980         int                     scopedist;
 981         int                     matchlen;
 982 };
 983
 984 struct ipv6_saddr_dst {
 985         const struct in6_addr *addr;
 986         int ifindex;
 987         int scope;
 988         int label;
 989         unsigned int prefs;
 990 };
 991
 992 static inline int ipv6_saddr_preferred(int type)
 993 {
 994         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 995                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 996                 return 1;
 997         return 0;
 998 }
 999
1000 static int ipv6_get_saddr_eval(struct net *net,
1001                                struct ipv6_saddr_score *score,
1002                                struct ipv6_saddr_dst *dst,
1003                                int i)
1004 {
1005         int ret;
1006
1007         if (i <= score->rule) {
1008                 switch (i) {
1009                 case IPV6_SADDR_RULE_SCOPE:
1010                         ret = score->scopedist;
1011                         break;
1012                 case IPV6_SADDR_RULE_PREFIX:
1013                         ret = score->matchlen;
1014                         break;
1015                 default:
1016                         ret = !!test_bit(i, score->scorebits);
1017                 }
1018                 goto out;
1019         }
1020
1021         switch (i) {
1022         case IPV6_SADDR_RULE_INIT:
1023                 /* Rule 0: remember if hiscore is not ready yet */
1024                 ret = !!score->ifa;
1025                 break;
1026         case IPV6_SADDR_RULE_LOCAL:
1027                 /* Rule 1: Prefer same address */
1028                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1029                 break;
1030         case IPV6_SADDR_RULE_SCOPE:
1031                 /* Rule 2: Prefer appropriate scope
1032                  *
1033                  *      ret
1034                  *       ^
1035                  *    -1 |  d 15
1036                  *    ---+--+-+---> scope
1037                  *       |
1038                  *       |             d is scope of the destination.
1039                  *  B-d  |  \
1040                  *       |   \      <- smaller scope is better if
1041                  *  B-15 |    \        if scope is enough for destinaion.
1042                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1043                  * d-C-1 | /
1044                  *       |/         <- greater is better
1045                  *   -C  /             if scope is not enough for destination.
1046                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1047                  *
1048                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050                  * Assume B = 0 and we get C > 29.
1051                  */
1052                 ret = __ipv6_addr_src_scope(score->addr_type);
1053                 if (ret >= dst->scope)
1054                         ret = -ret;
1055                 else
1056                         ret -= 128;     /* 30 is enough */
1057                 score->scopedist = ret;
1058                 break;
1059         case IPV6_SADDR_RULE_PREFERRED:
1060                 /* Rule 3: Avoid deprecated and optimistic addresses */
1061                 ret = ipv6_saddr_preferred(score->addr_type) ||
1062                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1063                 break;
1064 #ifdef CONFIG_IPV6_MIP6
1065         case IPV6_SADDR_RULE_HOA:
1066             {
1067                 /* Rule 4: Prefer home address */
1068                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1070                 break;
1071             }
1072 #endif
1073         case IPV6_SADDR_RULE_OIF:
1074                 /* Rule 5: Prefer outgoing interface */
1075                 ret = (!dst->ifindex ||
1076                        dst->ifindex == score->ifa->idev->dev->ifindex);
1077                 break;
1078         case IPV6_SADDR_RULE_LABEL:
1079                 /* Rule 6: Prefer matching label */
1080                 ret = ipv6_addr_label(net,
1081                                       &score->ifa->addr, score->addr_type,
1082                                       score->ifa->idev->dev->ifindex) == dst->label;
1083                 break;
1084 #ifdef CONFIG_IPV6_PRIVACY
1085         case IPV6_SADDR_RULE_PRIVACY:
1086             {
1087                 /* Rule 7: Prefer public address
1088                  * Note: prefer temprary address if use_tempaddr >= 2
1089                  */
1090                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1093                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1094                 break;
1095             }
1096 #endif
1097         case IPV6_SADDR_RULE_ORCHID:
1098                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1099                  *          non-ORCHID vs non-ORCHID
1100                  */
1101                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102                         ipv6_addr_orchid(dst->addr));
1103                 break;
1104         case IPV6_SADDR_RULE_PREFIX:
1105                 /* Rule 8: Use longest matching prefix */
1106                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107                                                        dst->addr);
1108                 break;
1109         default:
1110                 ret = 0;
1111         }
1112
1113         if (ret)
1114                 __set_bit(i, score->scorebits);
1115         score->rule = i;
1116 out:
1117         return ret;
1118 }
1119
1120 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1121                        const struct in6_addr *daddr, unsigned int prefs,
1122                        struct in6_addr *saddr)
1123 {
1124         struct ipv6_saddr_score scores[2],
1125                                 *score = &scores[0], *hiscore = &scores[1];
1126         struct ipv6_saddr_dst dst;
1127         struct net_device *dev;
1128         int dst_type;
1129
1130         dst_type = __ipv6_addr_type(daddr);
1131         dst.addr = daddr;
1132         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133         dst.scope = __ipv6_addr_src_scope(dst_type);
1134         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1135         dst.prefs = prefs;
1136
1137         hiscore->rule = -1;
1138         hiscore->ifa = NULL;
1139
1140         read_lock(&dev_base_lock);
1141         rcu_read_lock();
1142
1143         for_each_netdev(net, dev) {
1144                 struct inet6_dev *idev;
1145
1146                 /* Candidate Source Address (section 4)
1147                  *  - multicast and link-local destination address,
1148                  *    the set of candidate source address MUST only
1149                  *    include addresses assigned to interfaces
1150                  *    belonging to the same link as the outgoing
1151                  *    interface.
1152                  * (- For site-local destination addresses, the
1153                  *    set of candidate source addresses MUST only
1154                  *    include addresses assigned to interfaces
1155                  *    belonging to the same site as the outgoing
1156                  *    interface.)
1157                  */
1158                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160                     dst.ifindex && dev->ifindex != dst.ifindex)
1161                         continue;
1162
1163                 idev = __in6_dev_get(dev);
1164                 if (!idev)
1165                         continue;
1166
1167                 read_lock_bh(&idev->lock);
1168                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1169                         int i;
1170
1171                         /*
1172                          * - Tentative Address (RFC2462 section 5.4)
1173                          *  - A tentative address is not considered
1174                          *    "assigned to an interface" in the traditional
1175                          *    sense, unless it is also flagged as optimistic.
1176                          * - Candidate Source Address (section 4)
1177                          *  - In any case, anycast addresses, multicast
1178                          *    addresses, and the unspecified address MUST
1179                          *    NOT be included in a candidate set.
1180                          */
1181                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1183                                 continue;
1184
1185                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186
1187                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1189                                 LIMIT_NETDEBUG(KERN_DEBUG
1190                                                "ADDRCONF: unspecified / multicast address "
1191                                                "assigned as unicast address on %s",
1192                                                dev->name);
1193                                 continue;
1194                         }
1195
1196                         score->rule = -1;
1197                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198
1199                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200                                 int minihiscore, miniscore;
1201
1202                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1204
1205                                 if (minihiscore > miniscore) {
1206                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1207                                             score->scopedist > 0) {
1208                                                 /*
1209                                                  * special case:
1210                                                  * each remaining entry
1211                                                  * has too small (not enough)
1212                                                  * scope, because ifa entries
1213                                                  * are sorted by their scope
1214                                                  * values.
1215                                                  */
1216                                                 goto try_nextdev;
1217                                         }
1218                                         break;
1219                                 } else if (minihiscore < miniscore) {
1220                                         if (hiscore->ifa)
1221                                                 in6_ifa_put(hiscore->ifa);
1222
1223                                         in6_ifa_hold(score->ifa);
1224
1225                                         swap(hiscore, score);
1226
1227                                         /* restore our iterator */
1228                                         score->ifa = hiscore->ifa;
1229
1230                                         break;
1231                                 }
1232                         }
1233                 }
1234 try_nextdev:
1235                 read_unlock_bh(&idev->lock);
1236         }
1237         rcu_read_unlock();
1238         read_unlock(&dev_base_lock);
1239
1240         if (!hiscore->ifa)
1241                 return -EADDRNOTAVAIL;
1242
1243         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1244         in6_ifa_put(hiscore->ifa);
1245         return 0;
1246 }
1247
1248 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1249
1250 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1251                     unsigned char banned_flags)
1252 {
1253         struct inet6_dev *idev;
1254         int err = -EADDRNOTAVAIL;
1255
1256         rcu_read_lock();
1257         if ((idev = __in6_dev_get(dev)) != NULL) {
1258                 struct inet6_ifaddr *ifp;
1259
1260                 read_lock_bh(&idev->lock);
1261                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1262                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1263                                 ipv6_addr_copy(addr, &ifp->addr);
1264                                 err = 0;
1265                                 break;
1266                         }
1267                 }
1268                 read_unlock_bh(&idev->lock);
1269         }
1270         rcu_read_unlock();
1271         return err;
1272 }
1273
1274 static int ipv6_count_addresses(struct inet6_dev *idev)
1275 {
1276         int cnt = 0;
1277         struct inet6_ifaddr *ifp;
1278
1279         read_lock_bh(&idev->lock);
1280         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1281                 cnt++;
1282         read_unlock_bh(&idev->lock);
1283         return cnt;
1284 }
1285
1286 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1287                   struct net_device *dev, int strict)
1288 {
1289         struct inet6_ifaddr * ifp;
1290         u8 hash = ipv6_addr_hash(addr);
1291
1292         read_lock_bh(&addrconf_hash_lock);
1293         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1294                 if (!net_eq(dev_net(ifp->idev->dev), net))
1295                         continue;
1296                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1297                     !(ifp->flags&IFA_F_TENTATIVE)) {
1298                         if (dev == NULL || ifp->idev->dev == dev ||
1299                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1300                                 break;
1301                 }
1302         }
1303         read_unlock_bh(&addrconf_hash_lock);
1304         return ifp != NULL;
1305 }
1306 EXPORT_SYMBOL(ipv6_chk_addr);
1307
1308 static
1309 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1310                        struct net_device *dev)
1311 {
1312         struct inet6_ifaddr * ifp;
1313         u8 hash = ipv6_addr_hash(addr);
1314
1315         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1316                 if (!net_eq(dev_net(ifp->idev->dev), net))
1317                         continue;
1318                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1319                         if (dev == NULL || ifp->idev->dev == dev)
1320                                 break;
1321                 }
1322         }
1323         return ifp != NULL;
1324 }
1325
1326 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1327 {
1328         struct inet6_dev *idev;
1329         struct inet6_ifaddr *ifa;
1330         int     onlink;
1331
1332         onlink = 0;
1333         rcu_read_lock();
1334         idev = __in6_dev_get(dev);
1335         if (idev) {
1336                 read_lock_bh(&idev->lock);
1337                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1338                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1339                                                    ifa->prefix_len);
1340                         if (onlink)
1341                                 break;
1342                 }
1343                 read_unlock_bh(&idev->lock);
1344         }
1345         rcu_read_unlock();
1346         return onlink;
1347 }
1348
1349 EXPORT_SYMBOL(ipv6_chk_prefix);
1350
1351 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1352                                      struct net_device *dev, int strict)
1353 {
1354         struct inet6_ifaddr * ifp;
1355         u8 hash = ipv6_addr_hash(addr);
1356
1357         read_lock_bh(&addrconf_hash_lock);
1358         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1359                 if (!net_eq(dev_net(ifp->idev->dev), net))
1360                         continue;
1361                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1362                         if (dev == NULL || ifp->idev->dev == dev ||
1363                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1364                                 in6_ifa_hold(ifp);
1365                                 break;
1366                         }
1367                 }
1368         }
1369         read_unlock_bh(&addrconf_hash_lock);
1370
1371         return ifp;
1372 }
1373
1374 /* Gets referenced address, destroys ifaddr */
1375
1376 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1377 {
1378         if (ifp->flags&IFA_F_PERMANENT) {
1379                 spin_lock_bh(&ifp->lock);
1380                 addrconf_del_timer(ifp);
1381                 ifp->flags |= IFA_F_TENTATIVE;
1382                 if (dad_failed)
1383                         ifp->flags |= IFA_F_DADFAILED;
1384                 spin_unlock_bh(&ifp->lock);
1385                 in6_ifa_put(ifp);
1386 #ifdef CONFIG_IPV6_PRIVACY
1387         } else if (ifp->flags&IFA_F_TEMPORARY) {
1388                 struct inet6_ifaddr *ifpub;
1389                 spin_lock_bh(&ifp->lock);
1390                 ifpub = ifp->ifpub;
1391                 if (ifpub) {
1392                         in6_ifa_hold(ifpub);
1393                         spin_unlock_bh(&ifp->lock);
1394                         ipv6_create_tempaddr(ifpub, ifp);
1395                         in6_ifa_put(ifpub);
1396                 } else {
1397                         spin_unlock_bh(&ifp->lock);
1398                 }
1399                 ipv6_del_addr(ifp);
1400 #endif
1401         } else
1402                 ipv6_del_addr(ifp);
1403 }
1404
1405 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1406 {
1407         struct inet6_dev *idev = ifp->idev;
1408
1409         if (net_ratelimit())
1410                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1411                         ifp->idev->dev->name, &ifp->addr);
1412
1413         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1414                 struct in6_addr addr;
1415
1416                 addr.s6_addr32[0] = htonl(0xfe800000);
1417                 addr.s6_addr32[1] = 0;
1418
1419                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1420                     ipv6_addr_equal(&ifp->addr, &addr)) {
1421                         /* DAD failed for link-local based on MAC address */
1422                         idev->cnf.disable_ipv6 = 1;
1423
1424                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1425                                 ifp->idev->dev->name);
1426                 }
1427         }
1428
1429         addrconf_dad_stop(ifp, 1);
1430 }
1431
1432 /* Join to solicited addr multicast group. */
1433
1434 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1435 {
1436         struct in6_addr maddr;
1437
1438         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1439                 return;
1440
1441         addrconf_addr_solict_mult(addr, &maddr);
1442         ipv6_dev_mc_inc(dev, &maddr);
1443 }
1444
1445 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1446 {
1447         struct in6_addr maddr;
1448
1449         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1450                 return;
1451
1452         addrconf_addr_solict_mult(addr, &maddr);
1453         __ipv6_dev_mc_dec(idev, &maddr);
1454 }
1455
1456 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1457 {
1458         struct in6_addr addr;
1459         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1460         if (ipv6_addr_any(&addr))
1461                 return;
1462         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1463 }
1464
1465 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1466 {
1467         struct in6_addr addr;
1468         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1469         if (ipv6_addr_any(&addr))
1470                 return;
1471         __ipv6_dev_ac_dec(ifp->idev, &addr);
1472 }
1473
1474 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1475 {
1476         if (dev->addr_len != ETH_ALEN)
1477                 return -1;
1478         memcpy(eui, dev->dev_addr, 3);
1479         memcpy(eui + 5, dev->dev_addr + 3, 3);
1480
1481         /*
1482          * The zSeries OSA network cards can be shared among various
1483          * OS instances, but the OSA cards have only one MAC address.
1484          * This leads to duplicate address conflicts in conjunction
1485          * with IPv6 if more than one instance uses the same card.
1486          *
1487          * The driver for these cards can deliver a unique 16-bit
1488          * identifier for each instance sharing the same card.  It is
1489          * placed instead of 0xFFFE in the interface identifier.  The
1490          * "u" bit of the interface identifier is not inverted in this
1491          * case.  Hence the resulting interface identifier has local
1492          * scope according to RFC2373.
1493          */
1494         if (dev->dev_id) {
1495                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1496                 eui[4] = dev->dev_id & 0xFF;
1497         } else {
1498                 eui[3] = 0xFF;
1499                 eui[4] = 0xFE;
1500                 eui[0] ^= 2;
1501         }
1502         return 0;
1503 }
1504
1505 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1506 {
1507         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1508         if (dev->addr_len != ARCNET_ALEN)
1509                 return -1;
1510         memset(eui, 0, 7);
1511         eui[7] = *(u8*)dev->dev_addr;
1512         return 0;
1513 }
1514
1515 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1516 {
1517         if (dev->addr_len != INFINIBAND_ALEN)
1518                 return -1;
1519         memcpy(eui, dev->dev_addr + 12, 8);
1520         eui[0] |= 2;
1521         return 0;
1522 }
1523
1524 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1525 {
1526         if (addr == 0)
1527                 return -1;
1528         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1529                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1530                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1531                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1532                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1533                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1534         eui[1] = 0;
1535         eui[2] = 0x5E;
1536         eui[3] = 0xFE;
1537         memcpy(eui + 4, &addr, 4);
1538         return 0;
1539 }
1540 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1541
1542 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1543 {
1544         if (dev->priv_flags & IFF_ISATAP)
1545                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1546         return -1;
1547 }
1548
1549 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1550 {
1551         switch (dev->type) {
1552         case ARPHRD_ETHER:
1553         case ARPHRD_FDDI:
1554         case ARPHRD_IEEE802_TR:
1555                 return addrconf_ifid_eui48(eui, dev);
1556         case ARPHRD_ARCNET:
1557                 return addrconf_ifid_arcnet(eui, dev);
1558         case ARPHRD_INFINIBAND:
1559                 return addrconf_ifid_infiniband(eui, dev);
1560         case ARPHRD_SIT:
1561                 return addrconf_ifid_sit(eui, dev);
1562         }
1563         return -1;
1564 }
1565
1566 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1567 {
1568         int err = -1;
1569         struct inet6_ifaddr *ifp;
1570
1571         read_lock_bh(&idev->lock);
1572         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1573                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1574                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1575                         err = 0;
1576                         break;
1577                 }
1578         }
1579         read_unlock_bh(&idev->lock);
1580         return err;
1581 }
1582
1583 #ifdef CONFIG_IPV6_PRIVACY
1584 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1585 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1586 {
1587 regen:
1588         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1589         idev->rndid[0] &= ~0x02;
1590
1591         /*
1592          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1593          * check if generated address is not inappropriate
1594          *
1595          *  - Reserved subnet anycast (RFC 2526)
1596          *      11111101 11....11 1xxxxxxx
1597          *  - ISATAP (RFC4214) 6.1
1598          *      00-00-5E-FE-xx-xx-xx-xx
1599          *  - value 0
1600          *  - XXX: already assigned to an address on the device
1601          */
1602         if (idev->rndid[0] == 0xfd &&
1603             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1604             (idev->rndid[7]&0x80))
1605                 goto regen;
1606         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1607                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1608                         goto regen;
1609                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1610                         goto regen;
1611         }
1612
1613         return 0;
1614 }
1615
1616 static void ipv6_regen_rndid(unsigned long data)
1617 {
1618         struct inet6_dev *idev = (struct inet6_dev *) data;
1619         unsigned long expires;
1620
1621         rcu_read_lock_bh();
1622         write_lock_bh(&idev->lock);
1623
1624         if (idev->dead)
1625                 goto out;
1626
1627         if (__ipv6_regen_rndid(idev) < 0)
1628                 goto out;
1629
1630         expires = jiffies +
1631                 idev->cnf.temp_prefered_lft * HZ -
1632                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1633         if (time_before(expires, jiffies)) {
1634                 printk(KERN_WARNING
1635                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1636                         idev->dev->name);
1637                 goto out;
1638         }
1639
1640         if (!mod_timer(&idev->regen_timer, expires))
1641                 in6_dev_hold(idev);
1642
1643 out:
1644         write_unlock_bh(&idev->lock);
1645         rcu_read_unlock_bh();
1646         in6_dev_put(idev);
1647 }
1648
1649 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1650         int ret = 0;
1651
1652         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1653                 ret = __ipv6_regen_rndid(idev);
1654         return ret;
1655 }
1656 #endif
1657
1658 /*
1659  *      Add prefix route.
1660  */
1661
1662 static void
1663 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1664                       unsigned long expires, u32 flags)
1665 {
1666         struct fib6_config cfg = {
1667                 .fc_table = RT6_TABLE_PREFIX,
1668                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1669                 .fc_ifindex = dev->ifindex,
1670                 .fc_expires = expires,
1671                 .fc_dst_len = plen,
1672                 .fc_flags = RTF_UP | flags,
1673                 .fc_nlinfo.nl_net = dev_net(dev),
1674                 .fc_protocol = RTPROT_KERNEL,
1675         };
1676
1677         ipv6_addr_copy(&cfg.fc_dst, pfx);
1678
1679         /* Prevent useless cloning on PtP SIT.
1680            This thing is done here expecting that the whole
1681            class of non-broadcast devices need not cloning.
1682          */
1683 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1684         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1685                 cfg.fc_flags |= RTF_NONEXTHOP;
1686 #endif
1687
1688         ip6_route_add(&cfg);
1689 }
1690
1691 /* Create "default" multicast route to the interface */
1692
1693 static void addrconf_add_mroute(struct net_device *dev)
1694 {
1695         struct fib6_config cfg = {
1696                 .fc_table = RT6_TABLE_LOCAL,
1697                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1698                 .fc_ifindex = dev->ifindex,
1699                 .fc_dst_len = 8,
1700                 .fc_flags = RTF_UP,
1701                 .fc_nlinfo.nl_net = dev_net(dev),
1702         };
1703
1704         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1705
1706         ip6_route_add(&cfg);
1707 }
1708
1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1710 static void sit_route_add(struct net_device *dev)
1711 {
1712         struct fib6_config cfg = {
1713                 .fc_table = RT6_TABLE_MAIN,
1714                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1715                 .fc_ifindex = dev->ifindex,
1716                 .fc_dst_len = 96,
1717                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1718                 .fc_nlinfo.nl_net = dev_net(dev),
1719         };
1720
1721         /* prefix length - 96 bits "::d.d.d.d" */
1722         ip6_route_add(&cfg);
1723 }
1724 #endif
1725
1726 static void addrconf_add_lroute(struct net_device *dev)
1727 {
1728         struct in6_addr addr;
1729
1730         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1731         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1732 }
1733
1734 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1735 {
1736         struct inet6_dev *idev;
1737
1738         ASSERT_RTNL();
1739
1740         if ((idev = ipv6_find_idev(dev)) == NULL)
1741                 return NULL;
1742
1743         /* Add default multicast route */
1744         addrconf_add_mroute(dev);
1745
1746         /* Add link local route */
1747         addrconf_add_lroute(dev);
1748         return idev;
1749 }
1750
1751 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1752 {
1753         struct prefix_info *pinfo;
1754         __u32 valid_lft;
1755         __u32 prefered_lft;
1756         int addr_type;
1757         struct inet6_dev *in6_dev;
1758         struct net *net = dev_net(dev);
1759
1760         pinfo = (struct prefix_info *) opt;
1761
1762         if (len < sizeof(struct prefix_info)) {
1763                 ADBG(("addrconf: prefix option too short\n"));
1764                 return;
1765         }
1766
1767         /*
1768          *      Validation checks ([ADDRCONF], page 19)
1769          */
1770
1771         addr_type = ipv6_addr_type(&pinfo->prefix);
1772
1773         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1774                 return;
1775
1776         valid_lft = ntohl(pinfo->valid);
1777         prefered_lft = ntohl(pinfo->prefered);
1778
1779         if (prefered_lft > valid_lft) {
1780                 if (net_ratelimit())
1781                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1782                 return;
1783         }
1784
1785         in6_dev = in6_dev_get(dev);
1786
1787         if (in6_dev == NULL) {
1788                 if (net_ratelimit())
1789                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1790                 return;
1791         }
1792
1793         /*
1794          *      Two things going on here:
1795          *      1) Add routes for on-link prefixes
1796          *      2) Configure prefixes with the auto flag set
1797          */
1798
1799         if (pinfo->onlink) {
1800                 struct rt6_info *rt;
1801                 unsigned long rt_expires;
1802
1803                 /* Avoid arithmetic overflow. Really, we could
1804                  * save rt_expires in seconds, likely valid_lft,
1805                  * but it would require division in fib gc, that it
1806                  * not good.
1807                  */
1808                 if (HZ > USER_HZ)
1809                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1810                 else
1811                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1812
1813                 if (addrconf_finite_timeout(rt_expires))
1814                         rt_expires *= HZ;
1815
1816                 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1817                                 dev->ifindex, 1);
1818
1819                 if (rt && addrconf_is_prefix_route(rt)) {
1820                         /* Autoconf prefix route */
1821                         if (valid_lft == 0) {
1822                                 ip6_del_rt(rt);
1823                                 rt = NULL;
1824                         } else if (addrconf_finite_timeout(rt_expires)) {
1825                                 /* not infinity */
1826                                 rt->rt6i_expires = jiffies + rt_expires;
1827                                 rt->rt6i_flags |= RTF_EXPIRES;
1828                         } else {
1829                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1830                                 rt->rt6i_expires = 0;
1831                         }
1832                 } else if (valid_lft) {
1833                         clock_t expires = 0;
1834                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1835                         if (addrconf_finite_timeout(rt_expires)) {
1836                                 /* not infinity */
1837                                 flags |= RTF_EXPIRES;
1838                                 expires = jiffies_to_clock_t(rt_expires);
1839                         }
1840                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1841                                               dev, expires, flags);
1842                 }
1843                 if (rt)
1844                         dst_release(&rt->u.dst);
1845         }
1846
1847         /* Try to figure out our local address for this prefix */
1848
1849         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1850                 struct inet6_ifaddr * ifp;
1851                 struct in6_addr addr;
1852                 int create = 0, update_lft = 0;
1853
1854                 if (pinfo->prefix_len == 64) {
1855                         memcpy(&addr, &pinfo->prefix, 8);
1856                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1857                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1858                                 in6_dev_put(in6_dev);
1859                                 return;
1860                         }
1861                         goto ok;
1862                 }
1863                 if (net_ratelimit())
1864                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1865                                pinfo->prefix_len);
1866                 in6_dev_put(in6_dev);
1867                 return;
1868
1869 ok:
1870
1871                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1872
1873                 if (ifp == NULL && valid_lft) {
1874                         int max_addresses = in6_dev->cnf.max_addresses;
1875                         u32 addr_flags = 0;
1876
1877 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1878                         if (in6_dev->cnf.optimistic_dad &&
1879                             !net->ipv6.devconf_all->forwarding)
1880                                 addr_flags = IFA_F_OPTIMISTIC;
1881 #endif
1882
1883                         /* Do not allow to create too much of autoconfigured
1884                          * addresses; this would be too easy way to crash kernel.
1885                          */
1886                         if (!max_addresses ||
1887                             ipv6_count_addresses(in6_dev) < max_addresses)
1888                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1889                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1890                                                     addr_flags);
1891
1892                         if (!ifp || IS_ERR(ifp)) {
1893                                 in6_dev_put(in6_dev);
1894                                 return;
1895                         }
1896
1897                         update_lft = create = 1;
1898                         ifp->cstamp = jiffies;
1899                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1900                 }
1901
1902                 if (ifp) {
1903                         int flags;
1904                         unsigned long now;
1905 #ifdef CONFIG_IPV6_PRIVACY
1906                         struct inet6_ifaddr *ift;
1907 #endif
1908                         u32 stored_lft;
1909
1910                         /* update lifetime (RFC2462 5.5.3 e) */
1911                         spin_lock(&ifp->lock);
1912                         now = jiffies;
1913                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1914                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1915                         else
1916                                 stored_lft = 0;
1917                         if (!update_lft && stored_lft) {
1918                                 if (valid_lft > MIN_VALID_LIFETIME ||
1919                                     valid_lft > stored_lft)
1920                                         update_lft = 1;
1921                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1922                                         /* valid_lft <= stored_lft is always true */
1923                                         /*
1924                                          * RFC 4862 Section 5.5.3e:
1925                                          * "Note that the preferred lifetime of
1926                                          *  the corresponding address is always
1927                                          *  reset to the Preferred Lifetime in
1928                                          *  the received Prefix Information
1929                                          *  option, regardless of whether the
1930                                          *  valid lifetime is also reset or
1931                                          *  ignored."
1932                                          *
1933                                          *  So if the preferred lifetime in
1934                                          *  this advertisement is different
1935                                          *  than what we have stored, but the
1936                                          *  valid lifetime is invalid, just
1937                                          *  reset prefered_lft.
1938                                          *
1939                                          *  We must set the valid lifetime
1940                                          *  to the stored lifetime since we'll
1941                                          *  be updating the timestamp below,
1942                                          *  else we'll set it back to the
1943                                          *  minumum.
1944                                          */
1945                                         if (prefered_lft != ifp->prefered_lft) {
1946                                                 valid_lft = stored_lft;
1947                                                 update_lft = 1;
1948                                         }
1949                                 } else {
1950                                         valid_lft = MIN_VALID_LIFETIME;
1951                                         if (valid_lft < prefered_lft)
1952                                                 prefered_lft = valid_lft;
1953                                         update_lft = 1;
1954                                 }
1955                         }
1956
1957                         if (update_lft) {
1958                                 ifp->valid_lft = valid_lft;
1959                                 ifp->prefered_lft = prefered_lft;
1960                                 ifp->tstamp = now;
1961                                 flags = ifp->flags;
1962                                 ifp->flags &= ~IFA_F_DEPRECATED;
1963                                 spin_unlock(&ifp->lock);
1964
1965                                 if (!(flags&IFA_F_TENTATIVE))
1966                                         ipv6_ifa_notify(0, ifp);
1967                         } else
1968                                 spin_unlock(&ifp->lock);
1969
1970 #ifdef CONFIG_IPV6_PRIVACY
1971                         read_lock_bh(&in6_dev->lock);
1972                         /* update all temporary addresses in the list */
1973                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1974                                 /*
1975                                  * When adjusting the lifetimes of an existing
1976                                  * temporary address, only lower the lifetimes.
1977                                  * Implementations must not increase the
1978                                  * lifetimes of an existing temporary address
1979                                  * when processing a Prefix Information Option.
1980                                  */
1981                                 if (ifp != ift->ifpub)
1982                                         continue;
1983
1984                                 spin_lock(&ift->lock);
1985                                 flags = ift->flags;
1986                                 if (ift->valid_lft > valid_lft &&
1987                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1988                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1989                                 if (ift->prefered_lft > prefered_lft &&
1990                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1991                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1992                                 spin_unlock(&ift->lock);
1993                                 if (!(flags&IFA_F_TENTATIVE))
1994                                         ipv6_ifa_notify(0, ift);
1995                         }
1996
1997                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1998                                 /*
1999                                  * When a new public address is created as described in [ADDRCONF],
2000                                  * also create a new temporary address.
2001                                  */
2002                                 read_unlock_bh(&in6_dev->lock);
2003                                 ipv6_create_tempaddr(ifp, NULL);
2004                         } else {
2005                                 read_unlock_bh(&in6_dev->lock);
2006                         }
2007 #endif
2008                         in6_ifa_put(ifp);
2009                         addrconf_verify(0);
2010                 }
2011         }
2012         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2013         in6_dev_put(in6_dev);
2014 }
2015
2016 /*
2017  *      Set destination address.
2018  *      Special case for SIT interfaces where we create a new "virtual"
2019  *      device.
2020  */
2021 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2022 {
2023         struct in6_ifreq ireq;
2024         struct net_device *dev;
2025         int err = -EINVAL;
2026
2027         rtnl_lock();
2028
2029         err = -EFAULT;
2030         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2031                 goto err_exit;
2032
2033         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2034
2035         err = -ENODEV;
2036         if (dev == NULL)
2037                 goto err_exit;
2038
2039 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2040         if (dev->type == ARPHRD_SIT) {
2041                 const struct net_device_ops *ops = dev->netdev_ops;
2042                 struct ifreq ifr;
2043                 struct ip_tunnel_parm p;
2044
2045                 err = -EADDRNOTAVAIL;
2046                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2047                         goto err_exit;
2048
2049                 memset(&p, 0, sizeof(p));
2050                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2051                 p.iph.saddr = 0;
2052                 p.iph.version = 4;
2053                 p.iph.ihl = 5;
2054                 p.iph.protocol = IPPROTO_IPV6;
2055                 p.iph.ttl = 64;
2056                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2057
2058                 if (ops->ndo_do_ioctl) {
2059                         mm_segment_t oldfs = get_fs();
2060
2061                         set_fs(KERNEL_DS);
2062                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2063                         set_fs(oldfs);
2064                 } else
2065                         err = -EOPNOTSUPP;
2066
2067                 if (err == 0) {
2068                         err = -ENOBUFS;
2069                         dev = __dev_get_by_name(net, p.name);
2070                         if (!dev)
2071                                 goto err_exit;
2072                         err = dev_open(dev);
2073                 }
2074         }
2075 #endif
2076
2077 err_exit:
2078         rtnl_unlock();
2079         return err;
2080 }
2081
2082 /*
2083  *      Manual configuration of address on an interface
2084  */
2085 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2086                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2087                           __u32 valid_lft)
2088 {
2089         struct inet6_ifaddr *ifp;
2090         struct inet6_dev *idev;
2091         struct net_device *dev;
2092         int scope;
2093         u32 flags;
2094         clock_t expires;
2095         unsigned long timeout;
2096
2097         ASSERT_RTNL();
2098
2099         if (plen > 128)
2100                 return -EINVAL;
2101
2102         /* check the lifetime */
2103         if (!valid_lft || prefered_lft > valid_lft)
2104                 return -EINVAL;
2105
2106         dev = __dev_get_by_index(net, ifindex);
2107         if (!dev)
2108                 return -ENODEV;
2109
2110         if ((idev = addrconf_add_dev(dev)) == NULL)
2111                 return -ENOBUFS;
2112
2113         scope = ipv6_addr_scope(pfx);
2114
2115         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2116         if (addrconf_finite_timeout(timeout)) {
2117                 expires = jiffies_to_clock_t(timeout * HZ);
2118                 valid_lft = timeout;
2119                 flags = RTF_EXPIRES;
2120         } else {
2121                 expires = 0;
2122                 flags = 0;
2123                 ifa_flags |= IFA_F_PERMANENT;
2124         }
2125
2126         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2127         if (addrconf_finite_timeout(timeout)) {
2128                 if (timeout == 0)
2129                         ifa_flags |= IFA_F_DEPRECATED;
2130                 prefered_lft = timeout;
2131         }
2132
2133         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2134
2135         if (!IS_ERR(ifp)) {
2136                 spin_lock_bh(&ifp->lock);
2137                 ifp->valid_lft = valid_lft;
2138                 ifp->prefered_lft = prefered_lft;
2139                 ifp->tstamp = jiffies;
2140                 spin_unlock_bh(&ifp->lock);
2141
2142                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2143                                       expires, flags);
2144                 /*
2145                  * Note that section 3.1 of RFC 4429 indicates
2146                  * that the Optimistic flag should not be set for
2147                  * manually configured addresses
2148                  */
2149                 addrconf_dad_start(ifp, 0);
2150                 in6_ifa_put(ifp);
2151                 addrconf_verify(0);
2152                 return 0;
2153         }
2154
2155         return PTR_ERR(ifp);
2156 }
2157
2158 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2159                           unsigned int plen)
2160 {
2161         struct inet6_ifaddr *ifp;
2162         struct inet6_dev *idev;
2163         struct net_device *dev;
2164
2165         if (plen > 128)
2166                 return -EINVAL;
2167
2168         dev = __dev_get_by_index(net, ifindex);
2169         if (!dev)
2170                 return -ENODEV;
2171
2172         if ((idev = __in6_dev_get(dev)) == NULL)
2173                 return -ENXIO;
2174
2175         read_lock_bh(&idev->lock);
2176         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2177                 if (ifp->prefix_len == plen &&
2178                     ipv6_addr_equal(pfx, &ifp->addr)) {
2179                         in6_ifa_hold(ifp);
2180                         read_unlock_bh(&idev->lock);
2181
2182                         ipv6_del_addr(ifp);
2183
2184                         /* If the last address is deleted administratively,
2185                            disable IPv6 on this interface.
2186                          */
2187                         if (idev->addr_list == NULL)
2188                                 addrconf_ifdown(idev->dev, 1);
2189                         return 0;
2190                 }
2191         }
2192         read_unlock_bh(&idev->lock);
2193         return -EADDRNOTAVAIL;
2194 }
2195
2196
2197 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2198 {
2199         struct in6_ifreq ireq;
2200         int err;
2201
2202         if (!capable(CAP_NET_ADMIN))
2203                 return -EPERM;
2204
2205         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2206                 return -EFAULT;
2207
2208         rtnl_lock();
2209         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2210                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2211                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2212         rtnl_unlock();
2213         return err;
2214 }
2215
2216 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2217 {
2218         struct in6_ifreq ireq;
2219         int err;
2220
2221         if (!capable(CAP_NET_ADMIN))
2222                 return -EPERM;
2223
2224         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2225                 return -EFAULT;
2226
2227         rtnl_lock();
2228         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2229                              ireq.ifr6_prefixlen);
2230         rtnl_unlock();
2231         return err;
2232 }
2233
2234 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2235                      int plen, int scope)
2236 {
2237         struct inet6_ifaddr *ifp;
2238
2239         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2240         if (!IS_ERR(ifp)) {
2241                 spin_lock_bh(&ifp->lock);
2242                 ifp->flags &= ~IFA_F_TENTATIVE;
2243                 spin_unlock_bh(&ifp->lock);
2244                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2245                 in6_ifa_put(ifp);
2246         }
2247 }
2248
2249 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2250 static void sit_add_v4_addrs(struct inet6_dev *idev)
2251 {
2252         struct in6_addr addr;
2253         struct net_device *dev;
2254         struct net *net = dev_net(idev->dev);
2255         int scope;
2256
2257         ASSERT_RTNL();
2258
2259         memset(&addr, 0, sizeof(struct in6_addr));
2260         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2261
2262         if (idev->dev->flags&IFF_POINTOPOINT) {
2263                 addr.s6_addr32[0] = htonl(0xfe800000);
2264                 scope = IFA_LINK;
2265         } else {
2266                 scope = IPV6_ADDR_COMPATv4;
2267         }
2268
2269         if (addr.s6_addr32[3]) {
2270                 add_addr(idev, &addr, 128, scope);
2271                 return;
2272         }
2273
2274         for_each_netdev(net, dev) {
2275                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2276                 if (in_dev && (dev->flags & IFF_UP)) {
2277                         struct in_ifaddr * ifa;
2278
2279                         int flag = scope;
2280
2281                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2282                                 int plen;
2283
2284                                 addr.s6_addr32[3] = ifa->ifa_local;
2285
2286                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2287                                         continue;
2288                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2289                                         if (idev->dev->flags&IFF_POINTOPOINT)
2290                                                 continue;
2291                                         flag |= IFA_HOST;
2292                                 }
2293                                 if (idev->dev->flags&IFF_POINTOPOINT)
2294                                         plen = 64;
2295                                 else
2296                                         plen = 96;
2297
2298                                 add_addr(idev, &addr, plen, flag);
2299                         }
2300                 }
2301         }
2302 }
2303 #endif
2304
2305 static void init_loopback(struct net_device *dev)
2306 {
2307         struct inet6_dev  *idev;
2308
2309         /* ::1 */
2310
2311         ASSERT_RTNL();
2312
2313         if ((idev = ipv6_find_idev(dev)) == NULL) {
2314                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2315                 return;
2316         }
2317
2318         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2319 }
2320
2321 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2322 {
2323         struct inet6_ifaddr * ifp;
2324         u32 addr_flags = IFA_F_PERMANENT;
2325
2326 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2327         if (idev->cnf.optimistic_dad &&
2328             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2329                 addr_flags |= IFA_F_OPTIMISTIC;
2330 #endif
2331
2332
2333         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2334         if (!IS_ERR(ifp)) {
2335                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2336                 addrconf_dad_start(ifp, 0);
2337                 in6_ifa_put(ifp);
2338         }
2339 }
2340
2341 static void addrconf_dev_config(struct net_device *dev)
2342 {
2343         struct in6_addr addr;
2344         struct inet6_dev    * idev;
2345
2346         ASSERT_RTNL();
2347
2348         if ((dev->type != ARPHRD_ETHER) &&
2349             (dev->type != ARPHRD_FDDI) &&
2350             (dev->type != ARPHRD_IEEE802_TR) &&
2351             (dev->type != ARPHRD_ARCNET) &&
2352             (dev->type != ARPHRD_INFINIBAND)) {
2353                 /* Alas, we support only Ethernet autoconfiguration. */
2354                 return;
2355         }
2356
2357         idev = addrconf_add_dev(dev);
2358         if (idev == NULL)
2359                 return;
2360
2361         memset(&addr, 0, sizeof(struct in6_addr));
2362         addr.s6_addr32[0] = htonl(0xFE800000);
2363
2364         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2365                 addrconf_add_linklocal(idev, &addr);
2366 }
2367
2368 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2369 static void addrconf_sit_config(struct net_device *dev)
2370 {
2371         struct inet6_dev *idev;
2372
2373         ASSERT_RTNL();
2374
2375         /*
2376          * Configure the tunnel with one of our IPv4
2377          * addresses... we should configure all of
2378          * our v4 addrs in the tunnel
2379          */
2380
2381         if ((idev = ipv6_find_idev(dev)) == NULL) {
2382                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2383                 return;
2384         }
2385
2386         if (dev->priv_flags & IFF_ISATAP) {
2387                 struct in6_addr addr;
2388
2389                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2390                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2391                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2392                         addrconf_add_linklocal(idev, &addr);
2393                 return;
2394         }
2395
2396         sit_add_v4_addrs(idev);
2397
2398         if (dev->flags&IFF_POINTOPOINT) {
2399                 addrconf_add_mroute(dev);
2400                 addrconf_add_lroute(dev);
2401         } else
2402                 sit_route_add(dev);
2403 }
2404 #endif
2405
2406 static inline int
2407 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2408 {
2409         struct in6_addr lladdr;
2410
2411         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2412                 addrconf_add_linklocal(idev, &lladdr);
2413                 return 0;
2414         }
2415         return -1;
2416 }
2417
2418 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2419 {
2420         struct net_device *link_dev;
2421         struct net *net = dev_net(idev->dev);
2422
2423         /* first try to inherit the link-local address from the link device */
2424         if (idev->dev->iflink &&
2425             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2426                 if (!ipv6_inherit_linklocal(idev, link_dev))
2427                         return;
2428         }
2429         /* then try to inherit it from any device */
2430         for_each_netdev(net, link_dev) {
2431                 if (!ipv6_inherit_linklocal(idev, link_dev))
2432                         return;
2433         }
2434         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2435 }
2436
2437 /*
2438  * Autoconfigure tunnel with a link-local address so routing protocols,
2439  * DHCPv6, MLD etc. can be run over the virtual link
2440  */
2441
2442 static void addrconf_ip6_tnl_config(struct net_device *dev)
2443 {
2444         struct inet6_dev *idev;
2445
2446         ASSERT_RTNL();
2447
2448         if ((idev = addrconf_add_dev(dev)) == NULL) {
2449                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2450                 return;
2451         }
2452         ip6_tnl_add_linklocal(idev);
2453 }
2454
2455 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2456                            void * data)
2457 {
2458         struct net_device *dev = (struct net_device *) data;
2459         struct inet6_dev *idev = __in6_dev_get(dev);
2460         int run_pending = 0;
2461         int err;
2462
2463         switch(event) {
2464         case NETDEV_REGISTER:
2465                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2466                         idev = ipv6_add_dev(dev);
2467                         if (!idev)
2468                                 return notifier_from_errno(-ENOMEM);
2469                 }
2470                 break;
2471         case NETDEV_UP:
2472         case NETDEV_CHANGE:
2473                 if (dev->flags & IFF_SLAVE)
2474                         break;
2475
2476                 if (event == NETDEV_UP) {
2477                         if (!addrconf_qdisc_ok(dev)) {
2478                                 /* device is not ready yet. */
2479                                 printk(KERN_INFO
2480                                         "ADDRCONF(NETDEV_UP): %s: "
2481                                         "link is not ready\n",
2482                                         dev->name);
2483                                 break;
2484                         }
2485
2486                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2487                                 idev = ipv6_add_dev(dev);
2488
2489                         if (idev) {
2490                                 idev->if_flags |= IF_READY;
2491                                 run_pending = 1;
2492                         }
2493                 } else {
2494                         if (!addrconf_qdisc_ok(dev)) {
2495                                 /* device is still not ready. */
2496                                 break;
2497                         }
2498
2499                         if (idev) {
2500                                 if (idev->if_flags & IF_READY) {
2501                                         /* device is already configured. */
2502                                         break;
2503                                 }
2504                                 idev->if_flags |= IF_READY;
2505                         }
2506
2507                         printk(KERN_INFO
2508                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2509                                         "link becomes ready\n",
2510                                         dev->name);
2511
2512                         run_pending = 1;
2513                 }
2514
2515                 switch(dev->type) {
2516 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2517                 case ARPHRD_SIT:
2518                         addrconf_sit_config(dev);
2519                         break;
2520 #endif
2521                 case ARPHRD_TUNNEL6:
2522                         addrconf_ip6_tnl_config(dev);
2523                         break;
2524                 case ARPHRD_LOOPBACK:
2525                         init_loopback(dev);
2526                         break;
2527
2528                 default:
2529                         addrconf_dev_config(dev);
2530                         break;
2531                 }
2532                 if (idev) {
2533                         if (run_pending)
2534                                 addrconf_dad_run(idev);
2535
2536                         /* If the MTU changed during the interface down, when the
2537                            interface up, the changed MTU must be reflected in the
2538                            idev as well as routers.
2539                          */
2540                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2541                                 rt6_mtu_change(dev, dev->mtu);
2542                                 idev->cnf.mtu6 = dev->mtu;
2543                         }
2544                         idev->tstamp = jiffies;
2545                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2546                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2547                            stop IPv6 on this interface.
2548                          */
2549                         if (dev->mtu < IPV6_MIN_MTU)
2550                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2551                 }
2552                 break;
2553
2554         case NETDEV_CHANGEMTU:
2555                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2556                         rt6_mtu_change(dev, dev->mtu);
2557                         idev->cnf.mtu6 = dev->mtu;
2558                         break;
2559                 }
2560
2561                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2562                         idev = ipv6_add_dev(dev);
2563                         if (idev)
2564                                 break;
2565                 }
2566
2567                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2568
2569         case NETDEV_DOWN:
2570         case NETDEV_UNREGISTER:
2571                 /*
2572                  *      Remove all addresses from this interface.
2573                  */
2574                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2575                 break;
2576
2577         case NETDEV_CHANGENAME:
2578                 if (idev) {
2579                         snmp6_unregister_dev(idev);
2580                         addrconf_sysctl_unregister(idev);
2581                         addrconf_sysctl_register(idev);
2582                         err = snmp6_register_dev(idev);
2583                         if (err)
2584                                 return notifier_from_errno(err);
2585                 }
2586                 break;
2587         case NETDEV_BONDING_OLDTYPE:
2588         case NETDEV_BONDING_NEWTYPE:
2589                 addrconf_bonding_change(dev, event);
2590                 break;
2591         }
2592
2593         return NOTIFY_OK;
2594 }
2595
2596 /*
2597  *      addrconf module should be notified of a device going up
2598  */
2599 static struct notifier_block ipv6_dev_notf = {
2600         .notifier_call = addrconf_notify,
2601         .priority = 0
2602 };
2603
2604 static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2605 {
2606         struct inet6_dev *idev;
2607         ASSERT_RTNL();
2608
2609         idev = __in6_dev_get(dev);
2610
2611         if (event == NETDEV_BONDING_NEWTYPE)
2612                 ipv6_mc_remap(idev);
2613         else if (event == NETDEV_BONDING_OLDTYPE)
2614                 ipv6_mc_unmap(idev);
2615 }
2616
2617 static int addrconf_ifdown(struct net_device *dev, int how)
2618 {
2619         struct inet6_dev *idev;
2620         struct inet6_ifaddr *ifa, **bifa;
2621         struct net *net = dev_net(dev);
2622         int i;
2623
2624         ASSERT_RTNL();
2625
2626         rt6_ifdown(net, dev);
2627         neigh_ifdown(&nd_tbl, dev);
2628
2629         idev = __in6_dev_get(dev);
2630         if (idev == NULL)
2631                 return -ENODEV;
2632
2633         /* Step 1: remove reference to ipv6 device from parent device.
2634                    Do not dev_put!
2635          */
2636         if (how) {
2637                 idev->dead = 1;
2638
2639                 /* protected by rtnl_lock */
2640                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2641
2642                 /* Step 1.5: remove snmp6 entry */
2643                 snmp6_unregister_dev(idev);
2644
2645         }
2646
2647         /* Step 2: clear hash table */
2648         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2649                 bifa = &inet6_addr_lst[i];
2650
2651                 write_lock_bh(&addrconf_hash_lock);
2652                 while ((ifa = *bifa) != NULL) {
2653                         if (ifa->idev == idev) {
2654                                 *bifa = ifa->lst_next;
2655                                 ifa->lst_next = NULL;
2656                                 addrconf_del_timer(ifa);
2657                                 in6_ifa_put(ifa);
2658                                 continue;
2659                         }
2660                         bifa = &ifa->lst_next;
2661                 }
2662                 write_unlock_bh(&addrconf_hash_lock);
2663         }
2664
2665         write_lock_bh(&idev->lock);
2666
2667         /* Step 3: clear flags for stateless addrconf */
2668         if (!how)
2669                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2670
2671         /* Step 4: clear address list */
2672 #ifdef CONFIG_IPV6_PRIVACY
2673         if (how && del_timer(&idev->regen_timer))
2674                 in6_dev_put(idev);
2675
2676         /* clear tempaddr list */
2677         while ((ifa = idev->tempaddr_list) != NULL) {
2678                 idev->tempaddr_list = ifa->tmp_next;
2679                 ifa->tmp_next = NULL;
2680                 ifa->dead = 1;
2681                 write_unlock_bh(&idev->lock);
2682                 spin_lock_bh(&ifa->lock);
2683
2684                 if (ifa->ifpub) {
2685                         in6_ifa_put(ifa->ifpub);
2686                         ifa->ifpub = NULL;
2687                 }
2688                 spin_unlock_bh(&ifa->lock);
2689                 in6_ifa_put(ifa);
2690                 write_lock_bh(&idev->lock);
2691         }
2692 #endif
2693         while ((ifa = idev->addr_list) != NULL) {
2694                 idev->addr_list = ifa->if_next;
2695                 ifa->if_next = NULL;
2696                 ifa->dead = 1;
2697                 addrconf_del_timer(ifa);
2698                 write_unlock_bh(&idev->lock);
2699
2700                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2701                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2702                 in6_ifa_put(ifa);
2703
2704                 write_lock_bh(&idev->lock);
2705         }
2706         write_unlock_bh(&idev->lock);
2707
2708         /* Step 5: Discard multicast list */
2709
2710         if (how)
2711                 ipv6_mc_destroy_dev(idev);
2712         else
2713                 ipv6_mc_down(idev);
2714
2715         idev->tstamp = jiffies;
2716
2717         /* Shot the device (if unregistered) */
2718
2719         if (how) {
2720                 addrconf_sysctl_unregister(idev);
2721                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2722                 neigh_ifdown(&nd_tbl, dev);
2723                 in6_dev_put(idev);
2724         }
2725         return 0;
2726 }
2727
2728 static void addrconf_rs_timer(unsigned long data)
2729 {
2730         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2731
2732         if (ifp->idev->cnf.forwarding)
2733                 goto out;
2734
2735         if (ifp->idev->if_flags & IF_RA_RCVD) {
2736                 /*
2737                  *      Announcement received after solicitation
2738                  *      was sent
2739                  */
2740                 goto out;
2741         }
2742
2743         spin_lock(&ifp->lock);
2744         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2745                 /* The wait after the last probe can be shorter */
2746                 addrconf_mod_timer(ifp, AC_RS,
2747                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2748                                    ifp->idev->cnf.rtr_solicit_delay :
2749                                    ifp->idev->cnf.rtr_solicit_interval);
2750                 spin_unlock(&ifp->lock);
2751
2752                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2753         } else {
2754                 spin_unlock(&ifp->lock);
2755                 /*
2756                  * Note: we do not support deprecated "all on-link"
2757                  * assumption any longer.
2758                  */
2759                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2760                        ifp->idev->dev->name);
2761         }
2762
2763 out:
2764         in6_ifa_put(ifp);
2765 }
2766
2767 /*
2768  *      Duplicate Address Detection
2769  */
2770 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2771 {
2772         unsigned long rand_num;
2773         struct inet6_dev *idev = ifp->idev;
2774
2775         if (ifp->flags & IFA_F_OPTIMISTIC)
2776                 rand_num = 0;
2777         else
2778                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2779
2780         ifp->probes = idev->cnf.dad_transmits;
2781         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2782 }
2783
2784 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2785 {
2786         struct inet6_dev *idev = ifp->idev;
2787         struct net_device *dev = idev->dev;
2788
2789         addrconf_join_solict(dev, &ifp->addr);
2790
2791         net_srandom(ifp->addr.s6_addr32[3]);
2792
2793         read_lock_bh(&idev->lock);
2794         if (ifp->dead)
2795                 goto out;
2796         spin_lock_bh(&ifp->lock);
2797
2798         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2799             idev->cnf.accept_dad < 1 ||
2800             !(ifp->flags&IFA_F_TENTATIVE) ||
2801             ifp->flags & IFA_F_NODAD) {
2802                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2803                 spin_unlock_bh(&ifp->lock);
2804                 read_unlock_bh(&idev->lock);
2805
2806                 addrconf_dad_completed(ifp);
2807                 return;
2808         }
2809
2810         if (!(idev->if_flags & IF_READY)) {
2811                 spin_unlock_bh(&ifp->lock);
2812                 read_unlock_bh(&idev->lock);
2813                 /*
2814                  * If the device is not ready:
2815                  * - keep it tentative if it is a permanent address.
2816                  * - otherwise, kill it.
2817                  */
2818                 in6_ifa_hold(ifp);
2819                 addrconf_dad_stop(ifp, 0);
2820                 return;
2821         }
2822
2823         /*
2824          * Optimistic nodes can start receiving
2825          * Frames right away
2826          */
2827         if(ifp->flags & IFA_F_OPTIMISTIC)
2828                 ip6_ins_rt(ifp->rt);
2829
2830         addrconf_dad_kick(ifp);
2831         spin_unlock_bh(&ifp->lock);
2832 out:
2833         read_unlock_bh(&idev->lock);
2834 }
2835
2836 static void addrconf_dad_timer(unsigned long data)
2837 {
2838         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2839         struct inet6_dev *idev = ifp->idev;
2840         struct in6_addr mcaddr;
2841
2842         read_lock_bh(&idev->lock);
2843         if (idev->dead) {
2844                 read_unlock_bh(&idev->lock);
2845                 goto out;
2846         }
2847         spin_lock_bh(&ifp->lock);
2848         if (ifp->probes == 0) {
2849                 /*
2850                  * DAD was successful
2851                  */
2852
2853                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2854                 spin_unlock_bh(&ifp->lock);
2855                 read_unlock_bh(&idev->lock);
2856
2857                 addrconf_dad_completed(ifp);
2858
2859                 goto out;
2860         }
2861
2862         ifp->probes--;
2863         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2864         spin_unlock_bh(&ifp->lock);
2865         read_unlock_bh(&idev->lock);
2866
2867         /* send a neighbour solicitation for our addr */
2868         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2869         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2870 out:
2871         in6_ifa_put(ifp);
2872 }
2873
2874 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2875 {
2876         struct net_device *     dev = ifp->idev->dev;
2877
2878         /*
2879          *      Configure the address for reception. Now it is valid.
2880          */
2881
2882         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2883
2884         /* If added prefix is link local and forwarding is off,
2885            start sending router solicitations.
2886          */
2887
2888         if (ifp->idev->cnf.forwarding == 0 &&
2889             ifp->idev->cnf.rtr_solicits > 0 &&
2890             (dev->flags&IFF_LOOPBACK) == 0 &&
2891             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2892                 /*
2893                  *      If a host as already performed a random delay
2894                  *      [...] as part of DAD [...] there is no need
2895                  *      to delay again before sending the first RS
2896                  */
2897                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2898
2899                 spin_lock_bh(&ifp->lock);
2900                 ifp->probes = 1;
2901                 ifp->idev->if_flags |= IF_RS_SENT;
2902                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2903                 spin_unlock_bh(&ifp->lock);
2904         }
2905 }
2906
2907 static void addrconf_dad_run(struct inet6_dev *idev) {
2908         struct inet6_ifaddr *ifp;
2909
2910         read_lock_bh(&idev->lock);
2911         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2912                 spin_lock_bh(&ifp->lock);
2913                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2914                         spin_unlock_bh(&ifp->lock);
2915                         continue;
2916                 }
2917                 spin_unlock_bh(&ifp->lock);
2918                 addrconf_dad_kick(ifp);
2919         }
2920         read_unlock_bh(&idev->lock);
2921 }
2922
2923 #ifdef CONFIG_PROC_FS
2924 struct if6_iter_state {
2925         struct seq_net_private p;
2926         int bucket;
2927 };
2928
2929 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2930 {
2931         struct inet6_ifaddr *ifa = NULL;
2932         struct if6_iter_state *state = seq->private;
2933         struct net *net = seq_file_net(seq);
2934
2935         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2936                 ifa = inet6_addr_lst[state->bucket];
2937
2938                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2939                         ifa = ifa->lst_next;
2940                 if (ifa)
2941                         break;
2942         }
2943         return ifa;
2944 }
2945
2946 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2947 {
2948         struct if6_iter_state *state = seq->private;
2949         struct net *net = seq_file_net(seq);
2950
2951         ifa = ifa->lst_next;
2952 try_again:
2953         if (ifa) {
2954                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2955                         ifa = ifa->lst_next;
2956                         goto try_again;
2957                 }
2958         }
2959
2960         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2961                 ifa = inet6_addr_lst[state->bucket];
2962                 goto try_again;
2963         }
2964
2965         return ifa;
2966 }
2967
2968 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2969 {
2970         struct inet6_ifaddr *ifa = if6_get_first(seq);
2971
2972         if (ifa)
2973                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2974                         --pos;
2975         return pos ? NULL : ifa;
2976 }
2977
2978 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2979         __acquires(addrconf_hash_lock)
2980 {
2981         read_lock_bh(&addrconf_hash_lock);
2982         return if6_get_idx(seq, *pos);
2983 }
2984
2985 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2986 {
2987         struct inet6_ifaddr *ifa;
2988
2989         ifa = if6_get_next(seq, v);
2990         ++*pos;
2991         return ifa;
2992 }
2993
2994 static void if6_seq_stop(struct seq_file *seq, void *v)
2995         __releases(addrconf_hash_lock)
2996 {
2997         read_unlock_bh(&addrconf_hash_lock);
2998 }
2999
3000 static int if6_seq_show(struct seq_file *seq, void *v)
3001 {
3002         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3003         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3004                    &ifp->addr,
3005                    ifp->idev->dev->ifindex,
3006                    ifp->prefix_len,
3007                    ifp->scope,
3008                    ifp->flags,
3009                    ifp->idev->dev->name);
3010         return 0;
3011 }
3012
3013 static const struct seq_operations if6_seq_ops = {
3014         .start  = if6_seq_start,
3015         .next   = if6_seq_next,
3016         .show   = if6_seq_show,
3017         .stop   = if6_seq_stop,
3018 };
3019
3020 static int if6_seq_open(struct inode *inode, struct file *file)
3021 {
3022         return seq_open_net(inode, file, &if6_seq_ops,
3023                             sizeof(struct if6_iter_state));
3024 }
3025
3026 static const struct file_operations if6_fops = {
3027         .owner          = THIS_MODULE,
3028         .open           = if6_seq_open,
3029         .read           = seq_read,
3030         .llseek         = seq_lseek,
3031         .release        = seq_release_net,
3032 };
3033
3034 static int if6_proc_net_init(struct net *net)
3035 {
3036         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3037                 return -ENOMEM;
3038         return 0;
3039 }
3040
3041 static void if6_proc_net_exit(struct net *net)
3042 {
3043        proc_net_remove(net, "if_inet6");
3044 }
3045
3046 static struct pernet_operations if6_proc_net_ops = {
3047        .init = if6_proc_net_init,
3048        .exit = if6_proc_net_exit,
3049 };
3050
3051 int __init if6_proc_init(void)
3052 {
3053         return register_pernet_subsys(&if6_proc_net_ops);
3054 }
3055
3056 void if6_proc_exit(void)
3057 {
3058         unregister_pernet_subsys(&if6_proc_net_ops);
3059 }
3060 #endif  /* CONFIG_PROC_FS */
3061
3062 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3063 /* Check if address is a home address configured on any interface. */
3064 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3065 {
3066         int ret = 0;
3067         struct inet6_ifaddr * ifp;
3068         u8 hash = ipv6_addr_hash(addr);
3069         read_lock_bh(&addrconf_hash_lock);
3070         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3071                 if (!net_eq(dev_net(ifp->idev->dev), net))
3072                         continue;
3073                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3074                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3075                         ret = 1;
3076                         break;
3077                 }
3078         }
3079         read_unlock_bh(&addrconf_hash_lock);
3080         return ret;
3081 }
3082 #endif
3083
3084 /*
3085  *      Periodic address status verification
3086  */
3087
3088 static void addrconf_verify(unsigned long foo)
3089 {
3090         struct inet6_ifaddr *ifp;
3091         unsigned long now, next;
3092         int i;
3093
3094         spin_lock_bh(&addrconf_verify_lock);
3095         now = jiffies;
3096         next = now + ADDR_CHECK_FREQUENCY;
3097
3098         del_timer(&addr_chk_timer);
3099
3100         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3101
3102 restart:
3103                 read_lock(&addrconf_hash_lock);
3104                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3105                         unsigned long age;
3106 #ifdef CONFIG_IPV6_PRIVACY
3107                         unsigned long regen_advance;
3108 #endif
3109
3110                         if (ifp->flags & IFA_F_PERMANENT)
3111                                 continue;
3112
3113                         spin_lock(&ifp->lock);
3114                         age = (now - ifp->tstamp) / HZ;
3115
3116 #ifdef CONFIG_IPV6_PRIVACY
3117                         regen_advance = ifp->idev->cnf.regen_max_retry *
3118                                         ifp->idev->cnf.dad_transmits *
3119                                         ifp->idev->nd_parms->retrans_time / HZ;
3120 #endif
3121
3122                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3123                             age >= ifp->valid_lft) {
3124                                 spin_unlock(&ifp->lock);
3125                                 in6_ifa_hold(ifp);
3126                                 read_unlock(&addrconf_hash_lock);
3127                                 ipv6_del_addr(ifp);
3128                                 goto restart;
3129                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3130                                 spin_unlock(&ifp->lock);
3131                                 continue;
3132                         } else if (age >= ifp->prefered_lft) {
3133                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3134                                 int deprecate = 0;
3135
3136                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3137                                         deprecate = 1;
3138                                         ifp->flags |= IFA_F_DEPRECATED;
3139                                 }
3140
3141                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3142                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3143
3144                                 spin_unlock(&ifp->lock);
3145
3146                                 if (deprecate) {
3147                                         in6_ifa_hold(ifp);
3148                                         read_unlock(&addrconf_hash_lock);
3149
3150                                         ipv6_ifa_notify(0, ifp);
3151                                         in6_ifa_put(ifp);
3152                                         goto restart;
3153                                 }
3154 #ifdef CONFIG_IPV6_PRIVACY
3155                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3156                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3157                                 if (age >= ifp->prefered_lft - regen_advance) {
3158                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3159                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3160                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3161                                         if (!ifp->regen_count && ifpub) {
3162                                                 ifp->regen_count++;
3163                                                 in6_ifa_hold(ifp);
3164                                                 in6_ifa_hold(ifpub);
3165                                                 spin_unlock(&ifp->lock);
3166                                                 read_unlock(&addrconf_hash_lock);
3167                                                 spin_lock(&ifpub->lock);
3168                                                 ifpub->regen_count = 0;
3169                                                 spin_unlock(&ifpub->lock);
3170                                                 ipv6_create_tempaddr(ifpub, ifp);
3171                                                 in6_ifa_put(ifpub);
3172                                                 in6_ifa_put(ifp);
3173                                                 goto restart;
3174                                         }
3175                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3176                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3177                                 spin_unlock(&ifp->lock);
3178 #endif
3179                         } else {
3180                                 /* ifp->prefered_lft <= ifp->valid_lft */
3181                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3182                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3183                                 spin_unlock(&ifp->lock);
3184                         }
3185                 }
3186                 read_unlock(&addrconf_hash_lock);
3187         }
3188
3189         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3190         add_timer(&addr_chk_timer);
3191         spin_unlock_bh(&addrconf_verify_lock);
3192 }
3193
3194 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3195 {
3196         struct in6_addr *pfx = NULL;
3197
3198         if (addr)
3199                 pfx = nla_data(addr);
3200
3201         if (local) {
3202                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3203                         pfx = NULL;
3204                 else
3205                         pfx = nla_data(local);
3206         }
3207
3208         return pfx;
3209 }
3210
3211 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3212         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3213         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3214         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3215 };
3216
3217 static int
3218 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3219 {
3220         struct net *net = sock_net(skb->sk);
3221         struct ifaddrmsg *ifm;
3222         struct nlattr *tb[IFA_MAX+1];
3223         struct in6_addr *pfx;
3224         int err;
3225
3226         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3227         if (err < 0)
3228                 return err;
3229
3230         ifm = nlmsg_data(nlh);
3231         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3232         if (pfx == NULL)
3233                 return -EINVAL;
3234
3235         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3236 }
3237
3238 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3239                              u32 prefered_lft, u32 valid_lft)
3240 {
3241         u32 flags;
3242         clock_t expires;
3243         unsigned long timeout;
3244
3245         if (!valid_lft || (prefered_lft > valid_lft))
3246                 return -EINVAL;
3247
3248         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3249         if (addrconf_finite_timeout(timeout)) {
3250                 expires = jiffies_to_clock_t(timeout * HZ);
3251                 valid_lft = timeout;
3252                 flags = RTF_EXPIRES;
3253         } else {
3254                 expires = 0;
3255                 flags = 0;
3256                 ifa_flags |= IFA_F_PERMANENT;
3257         }
3258
3259         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3260         if (addrconf_finite_timeout(timeout)) {
3261                 if (timeout == 0)
3262                         ifa_flags |= IFA_F_DEPRECATED;
3263                 prefered_lft = timeout;
3264         }
3265
3266         spin_lock_bh(&ifp->lock);
3267         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3268         ifp->tstamp = jiffies;
3269         ifp->valid_lft = valid_lft;
3270         ifp->prefered_lft = prefered_lft;
3271
3272         spin_unlock_bh(&ifp->lock);
3273         if (!(ifp->flags&IFA_F_TENTATIVE))
3274                 ipv6_ifa_notify(0, ifp);
3275
3276         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3277                               expires, flags);
3278         addrconf_verify(0);
3279
3280         return 0;
3281 }
3282
3283 static int
3284 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3285 {
3286         struct net *net = sock_net(skb->sk);
3287         struct ifaddrmsg *ifm;
3288         struct nlattr *tb[IFA_MAX+1];
3289         struct in6_addr *pfx;
3290         struct inet6_ifaddr *ifa;
3291         struct net_device *dev;
3292         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3293         u8 ifa_flags;
3294         int err;
3295
3296         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3297         if (err < 0)
3298                 return err;
3299
3300         ifm = nlmsg_data(nlh);
3301         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3302         if (pfx == NULL)
3303                 return -EINVAL;
3304
3305         if (tb[IFA_CACHEINFO]) {
3306                 struct ifa_cacheinfo *ci;
3307
3308                 ci = nla_data(tb[IFA_CACHEINFO]);
3309                 valid_lft = ci->ifa_valid;
3310                 preferred_lft = ci->ifa_prefered;
3311         } else {
3312                 preferred_lft = INFINITY_LIFE_TIME;
3313                 valid_lft = INFINITY_LIFE_TIME;
3314         }
3315
3316         dev =  __dev_get_by_index(net, ifm->ifa_index);
3317         if (dev == NULL)
3318                 return -ENODEV;
3319
3320         /* We ignore other flags so far. */
3321         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3322
3323         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3324         if (ifa == NULL) {
3325                 /*
3326                  * It would be best to check for !NLM_F_CREATE here but
3327                  * userspace alreay relies on not having to provide this.
3328                  */
3329                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3330                                       ifm->ifa_prefixlen, ifa_flags,
3331                                       preferred_lft, valid_lft);
3332         }
3333
3334         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3335             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3336                 err = -EEXIST;
3337         else
3338                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3339
3340         in6_ifa_put(ifa);
3341
3342         return err;
3343 }
3344
3345 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3346                           u8 scope, int ifindex)
3347 {
3348         struct ifaddrmsg *ifm;
3349
3350         ifm = nlmsg_data(nlh);
3351         ifm->ifa_family = AF_INET6;
3352         ifm->ifa_prefixlen = prefixlen;
3353         ifm->ifa_flags = flags;
3354         ifm->ifa_scope = scope;
3355         ifm->ifa_index = ifindex;
3356 }
3357
3358 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3359                          unsigned long tstamp, u32 preferred, u32 valid)
3360 {
3361         struct ifa_cacheinfo ci;
3362
3363         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3364                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3365         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3366                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3367         ci.ifa_prefered = preferred;
3368         ci.ifa_valid = valid;
3369
3370         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3371 }
3372
3373 static inline int rt_scope(int ifa_scope)
3374 {
3375         if (ifa_scope & IFA_HOST)
3376                 return RT_SCOPE_HOST;
3377         else if (ifa_scope & IFA_LINK)
3378                 return RT_SCOPE_LINK;
3379         else if (ifa_scope & IFA_SITE)
3380                 return RT_SCOPE_SITE;
3381         else
3382                 return RT_SCOPE_UNIVERSE;
3383 }
3384
3385 static inline int inet6_ifaddr_msgsize(void)
3386 {
3387         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3388                + nla_total_size(16) /* IFA_ADDRESS */
3389                + nla_total_size(sizeof(struct ifa_cacheinfo));
3390 }
3391
3392 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3393                              u32 pid, u32 seq, int event, unsigned int flags)
3394 {
3395         struct nlmsghdr  *nlh;
3396         u32 preferred, valid;
3397
3398         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3399         if (nlh == NULL)
3400                 return -EMSGSIZE;
3401
3402         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3403                       ifa->idev->dev->ifindex);
3404
3405         if (!(ifa->flags&IFA_F_PERMANENT)) {
3406                 preferred = ifa->prefered_lft;
3407                 valid = ifa->valid_lft;
3408                 if (preferred != INFINITY_LIFE_TIME) {
3409                         long tval = (jiffies - ifa->tstamp)/HZ;
3410                         if (preferred > tval)
3411                                 preferred -= tval;
3412                         else
3413                                 preferred = 0;
3414                         if (valid != INFINITY_LIFE_TIME)
3415                                 valid -= tval;
3416                 }
3417         } else {
3418                 preferred = INFINITY_LIFE_TIME;
3419                 valid = INFINITY_LIFE_TIME;
3420         }
3421
3422         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3423             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3424                 nlmsg_cancel(skb, nlh);
3425                 return -EMSGSIZE;
3426         }
3427
3428         return nlmsg_end(skb, nlh);
3429 }
3430
3431 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3432                                 u32 pid, u32 seq, int event, u16 flags)
3433 {
3434         struct nlmsghdr  *nlh;
3435         u8 scope = RT_SCOPE_UNIVERSE;
3436         int ifindex = ifmca->idev->dev->ifindex;
3437
3438         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3439                 scope = RT_SCOPE_SITE;
3440
3441         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3442         if (nlh == NULL)
3443                 return -EMSGSIZE;
3444
3445         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3446         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3447             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3448                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3449                 nlmsg_cancel(skb, nlh);
3450                 return -EMSGSIZE;
3451         }
3452
3453         return nlmsg_end(skb, nlh);
3454 }
3455
3456 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3457                                 u32 pid, u32 seq, int event, unsigned int flags)
3458 {
3459         struct nlmsghdr  *nlh;
3460         u8 scope = RT_SCOPE_UNIVERSE;
3461         int ifindex = ifaca->aca_idev->dev->ifindex;
3462
3463         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3464                 scope = RT_SCOPE_SITE;
3465
3466         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3467         if (nlh == NULL)
3468                 return -EMSGSIZE;
3469
3470         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3471         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3472             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3473                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3474                 nlmsg_cancel(skb, nlh);
3475                 return -EMSGSIZE;
3476         }
3477
3478         return nlmsg_end(skb, nlh);
3479 }
3480
3481 enum addr_type_t
3482 {
3483         UNICAST_ADDR,
3484         MULTICAST_ADDR,
3485         ANYCAST_ADDR,
3486 };
3487
3488 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3489                            enum addr_type_t type)
3490 {
3491         int idx, ip_idx;
3492         int s_idx, s_ip_idx;
3493         int err = 1;
3494         struct net_device *dev;
3495         struct inet6_dev *idev = NULL;
3496         struct inet6_ifaddr *ifa;
3497         struct ifmcaddr6 *ifmca;
3498         struct ifacaddr6 *ifaca;
3499         struct net *net = sock_net(skb->sk);
3500
3501         s_idx = cb->args[0];
3502         s_ip_idx = ip_idx = cb->args[1];
3503
3504         idx = 0;
3505         for_each_netdev(net, dev) {
3506                 if (idx < s_idx)
3507                         goto cont;
3508                 if (idx > s_idx)
3509                         s_ip_idx = 0;
3510                 ip_idx = 0;
3511                 if ((idev = in6_dev_get(dev)) == NULL)
3512                         goto cont;
3513                 read_lock_bh(&idev->lock);
3514                 switch (type) {
3515                 case UNICAST_ADDR:
3516                         /* unicast address incl. temp addr */
3517                         for (ifa = idev->addr_list; ifa;
3518                              ifa = ifa->if_next, ip_idx++) {
3519                                 if (ip_idx < s_ip_idx)
3520                                         continue;
3521                                 err = inet6_fill_ifaddr(skb, ifa,
3522                                                         NETLINK_CB(cb->skb).pid,
3523                                                         cb->nlh->nlmsg_seq,
3524                                                         RTM_NEWADDR,
3525                                                         NLM_F_MULTI);
3526                         }
3527                         break;
3528                 case MULTICAST_ADDR:
3529                         /* multicast address */
3530                         for (ifmca = idev->mc_list; ifmca;
3531                              ifmca = ifmca->next, ip_idx++) {
3532                                 if (ip_idx < s_ip_idx)
3533                                         continue;
3534                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3535                                                           NETLINK_CB(cb->skb).pid,
3536                                                           cb->nlh->nlmsg_seq,
3537                                                           RTM_GETMULTICAST,
3538                                                           NLM_F_MULTI);
3539                         }
3540                         break;
3541                 case ANYCAST_ADDR:
3542                         /* anycast address */
3543                         for (ifaca = idev->ac_list; ifaca;
3544                              ifaca = ifaca->aca_next, ip_idx++) {
3545                                 if (ip_idx < s_ip_idx)
3546                                         continue;
3547                                 err = inet6_fill_ifacaddr(skb, ifaca,
3548                                                           NETLINK_CB(cb->skb).pid,
3549                                                           cb->nlh->nlmsg_seq,
3550                                                           RTM_GETANYCAST,
3551                                                           NLM_F_MULTI);
3552                         }
3553                         break;
3554                 default:
3555                         break;
3556                 }
3557                 read_unlock_bh(&idev->lock);
3558                 in6_dev_put(idev);
3559
3560                 if (err <= 0)
3561                         break;
3562 cont:
3563                 idx++;
3564         }
3565         cb->args[0] = idx;
3566         cb->args[1] = ip_idx;
3567         return skb->len;
3568 }
3569
3570 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3571 {
3572         enum addr_type_t type = UNICAST_ADDR;
3573
3574         return inet6_dump_addr(skb, cb, type);
3575 }
3576
3577 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3578 {
3579         enum addr_type_t type = MULTICAST_ADDR;
3580
3581         return inet6_dump_addr(skb, cb, type);
3582 }
3583
3584
3585 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3586 {
3587         enum addr_type_t type = ANYCAST_ADDR;
3588
3589         return inet6_dump_addr(skb, cb, type);
3590 }
3591
3592 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3593                              void *arg)
3594 {
3595         struct net *net = sock_net(in_skb->sk);
3596         struct ifaddrmsg *ifm;
3597         struct nlattr *tb[IFA_MAX+1];
3598         struct in6_addr *addr = NULL;
3599         struct net_device *dev = NULL;
3600         struct inet6_ifaddr *ifa;
3601         struct sk_buff *skb;
3602         int err;
3603
3604         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3605         if (err < 0)
3606                 goto errout;
3607
3608         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3609         if (addr == NULL) {
3610                 err = -EINVAL;
3611                 goto errout;
3612         }
3613
3614         ifm = nlmsg_data(nlh);
3615         if (ifm->ifa_index)
3616                 dev = __dev_get_by_index(net, ifm->ifa_index);
3617
3618         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3619                 err = -EADDRNOTAVAIL;
3620                 goto errout;
3621         }
3622
3623         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3624                 err = -ENOBUFS;
3625                 goto errout_ifa;
3626         }
3627
3628         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3629                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3630         if (err < 0) {
3631                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3632                 WARN_ON(err == -EMSGSIZE);
3633                 kfree_skb(skb);
3634                 goto errout_ifa;
3635         }
3636         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3637 errout_ifa:
3638         in6_ifa_put(ifa);
3639 errout:
3640         return err;
3641 }
3642
3643 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3644 {
3645         struct sk_buff *skb;
3646         struct net *net = dev_net(ifa->idev->dev);
3647         int err = -ENOBUFS;
3648
3649         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3650         if (skb == NULL)
3651                 goto errout;
3652
3653         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3654         if (err < 0) {
3655                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3656                 WARN_ON(err == -EMSGSIZE);
3657                 kfree_skb(skb);
3658                 goto errout;
3659         }
3660         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3661         return;
3662 errout:
3663         if (err < 0)
3664                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3665 }
3666
3667 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3668                                 __s32 *array, int bytes)
3669 {
3670         BUG_ON(bytes < (DEVCONF_MAX * 4));
3671
3672         memset(array, 0, bytes);
3673         array[DEVCONF_FORWARDING] = cnf->forwarding;
3674         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3675         array[DEVCONF_MTU6] = cnf->mtu6;
3676         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3677         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3678         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3679         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3680         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3681         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3682         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3683         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3684 #ifdef CONFIG_IPV6_PRIVACY
3685         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3686         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3687         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3688         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3689         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3690 #endif
3691         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3692         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3693         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3694 #ifdef CONFIG_IPV6_ROUTER_PREF
3695         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3696         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3697 #ifdef CONFIG_IPV6_ROUTE_INFO
3698         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3699 #endif
3700 #endif
3701         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3702         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3703 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3704         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3705 #endif
3706 #ifdef CONFIG_IPV6_MROUTE
3707         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3708 #endif
3709         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3710         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3711 }
3712
3713 static inline size_t inet6_if_nlmsg_size(void)
3714 {
3715         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3716                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3717                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3718                + nla_total_size(4) /* IFLA_MTU */
3719                + nla_total_size(4) /* IFLA_LINK */
3720                + nla_total_size( /* IFLA_PROTINFO */
3721                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3722                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3723                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3724                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3725                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3726                  );
3727 }
3728
3729 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3730                                       int bytes)
3731 {
3732         int i;
3733         int pad = bytes - sizeof(u64) * items;
3734         BUG_ON(pad < 0);
3735
3736         /* Use put_unaligned() because stats may not be aligned for u64. */
3737         put_unaligned(items, &stats[0]);
3738         for (i = 1; i < items; i++)
3739                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3740
3741         memset(&stats[items], 0, pad);
3742 }
3743
3744 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3745                              int bytes)
3746 {
3747         switch(attrtype) {
3748         case IFLA_INET6_STATS:
3749                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3750                 break;
3751         case IFLA_INET6_ICMP6STATS:
3752                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3753                 break;
3754         }
3755 }
3756
3757 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3758                              u32 pid, u32 seq, int event, unsigned int flags)
3759 {
3760         struct net_device *dev = idev->dev;
3761         struct nlattr *nla;
3762         struct ifinfomsg *hdr;
3763         struct nlmsghdr *nlh;
3764         void *protoinfo;
3765         struct ifla_cacheinfo ci;
3766
3767         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3768         if (nlh == NULL)
3769                 return -EMSGSIZE;
3770
3771         hdr = nlmsg_data(nlh);
3772         hdr->ifi_family = AF_INET6;
3773         hdr->__ifi_pad = 0;
3774         hdr->ifi_type = dev->type;
3775         hdr->ifi_index = dev->ifindex;
3776         hdr->ifi_flags = dev_get_flags(dev);
3777         hdr->ifi_change = 0;
3778
3779         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3780
3781         if (dev->addr_len)
3782                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3783
3784         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3785         if (dev->ifindex != dev->iflink)
3786                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3787
3788         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3789         if (protoinfo == NULL)
3790                 goto nla_put_failure;
3791
3792         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3793
3794         ci.max_reasm_len = IPV6_MAXPLEN;
3795         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3796                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3797         ci.reachable_time = idev->nd_parms->reachable_time;
3798         ci.retrans_time = idev->nd_parms->retrans_time;
3799         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3800
3801         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3802         if (nla == NULL)
3803                 goto nla_put_failure;
3804         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3805
3806         /* XXX - MC not implemented */
3807
3808         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3809         if (nla == NULL)
3810                 goto nla_put_failure;
3811         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3812
3813         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3814         if (nla == NULL)
3815                 goto nla_put_failure;
3816         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3817
3818         nla_nest_end(skb, protoinfo);
3819         return nlmsg_end(skb, nlh);
3820
3821 nla_put_failure:
3822         nlmsg_cancel(skb, nlh);
3823         return -EMSGSIZE;
3824 }
3825
3826 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3827 {
3828         struct net *net = sock_net(skb->sk);
3829         int idx, err;
3830         int s_idx = cb->args[0];
3831         struct net_device *dev;
3832         struct inet6_dev *idev;
3833
3834         read_lock(&dev_base_lock);
3835         idx = 0;
3836         for_each_netdev(net, dev) {
3837                 if (idx < s_idx)
3838                         goto cont;
3839                 if ((idev = in6_dev_get(dev)) == NULL)
3840                         goto cont;
3841                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3842                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3843                 in6_dev_put(idev);
3844                 if (err <= 0)
3845                         break;
3846 cont:
3847                 idx++;
3848         }
3849         read_unlock(&dev_base_lock);
3850         cb->args[0] = idx;
3851
3852         return skb->len;
3853 }
3854
3855 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3856 {
3857         struct sk_buff *skb;
3858         struct net *net = dev_net(idev->dev);
3859         int err = -ENOBUFS;
3860
3861         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3862         if (skb == NULL)
3863                 goto errout;
3864
3865         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3866         if (err < 0) {
3867                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3868                 WARN_ON(err == -EMSGSIZE);
3869                 kfree_skb(skb);
3870                 goto errout;
3871         }
3872         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3873         return;
3874 errout:
3875         if (err < 0)
3876                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3877 }
3878
3879 static inline size_t inet6_prefix_nlmsg_size(void)
3880 {
3881         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3882                + nla_total_size(sizeof(struct in6_addr))
3883                + nla_total_size(sizeof(struct prefix_cacheinfo));
3884 }
3885
3886 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3887                              struct prefix_info *pinfo, u32 pid, u32 seq,
3888                              int event, unsigned int flags)
3889 {
3890         struct prefixmsg *pmsg;
3891         struct nlmsghdr *nlh;
3892         struct prefix_cacheinfo ci;
3893
3894         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3895         if (nlh == NULL)
3896                 return -EMSGSIZE;
3897
3898         pmsg = nlmsg_data(nlh);
3899         pmsg->prefix_family = AF_INET6;
3900         pmsg->prefix_pad1 = 0;
3901         pmsg->prefix_pad2 = 0;
3902         pmsg->prefix_ifindex = idev->dev->ifindex;
3903         pmsg->prefix_len = pinfo->prefix_len;
3904         pmsg->prefix_type = pinfo->type;
3905         pmsg->prefix_pad3 = 0;
3906         pmsg->prefix_flags = 0;
3907         if (pinfo->onlink)
3908                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3909         if (pinfo->autoconf)
3910                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3911
3912         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3913
3914         ci.preferred_time = ntohl(pinfo->prefered);
3915         ci.valid_time = ntohl(pinfo->valid);
3916         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3917
3918         return nlmsg_end(skb, nlh);
3919
3920 nla_put_failure:
3921         nlmsg_cancel(skb, nlh);
3922         return -EMSGSIZE;
3923 }
3924
3925 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3926                          struct prefix_info *pinfo)
3927 {
3928         struct sk_buff *skb;
3929         struct net *net = dev_net(idev->dev);
3930         int err = -ENOBUFS;
3931
3932         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3933         if (skb == NULL)
3934                 goto errout;
3935
3936         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3937         if (err < 0) {
3938                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3939                 WARN_ON(err == -EMSGSIZE);
3940                 kfree_skb(skb);
3941                 goto errout;
3942         }
3943         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3944         return;
3945 errout:
3946         if (err < 0)
3947                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3948 }
3949
3950 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3951 {
3952         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3953
3954         switch (event) {
3955         case RTM_NEWADDR:
3956                 /*
3957                  * If the address was optimistic
3958                  * we inserted the route at the start of
3959                  * our DAD process, so we don't need
3960                  * to do it again
3961                  */
3962                 if (!(ifp->rt->rt6i_node))
3963                         ip6_ins_rt(ifp->rt);
3964                 if (ifp->idev->cnf.forwarding)
3965                         addrconf_join_anycast(ifp);
3966                 break;
3967         case RTM_DELADDR:
3968                 if (ifp->idev->cnf.forwarding)
3969                         addrconf_leave_anycast(ifp);
3970                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3971                 dst_hold(&ifp->rt->u.dst);
3972                 if (ip6_del_rt(ifp->rt))
3973                         dst_free(&ifp->rt->u.dst);
3974                 break;
3975         }
3976 }
3977
3978 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3979 {
3980         rcu_read_lock_bh();
3981         if (likely(ifp->idev->dead == 0))
3982                 __ipv6_ifa_notify(event, ifp);
3983         rcu_read_unlock_bh();
3984 }
3985
3986 #ifdef CONFIG_SYSCTL
3987
3988 static
3989 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3990                            void __user *buffer, size_t *lenp, loff_t *ppos)
3991 {
3992         int *valp = ctl->data;
3993         int val = *valp;
3994         int ret;
3995
3996         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3997
3998         if (write)
3999                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4000         return ret;
4001 }
4002
4003 static int addrconf_sysctl_forward_strategy(ctl_table *table,
4004                                             void __user *oldval,
4005                                             size_t __user *oldlenp,
4006                                             void __user *newval, size_t newlen)
4007 {
4008         int *valp = table->data;
4009         int val = *valp;
4010         int new;
4011
4012         if (!newval || !newlen)
4013                 return 0;
4014         if (newlen != sizeof(int))
4015                 return -EINVAL;
4016         if (get_user(new, (int __user *)newval))
4017                 return -EFAULT;
4018         if (new == *valp)
4019                 return 0;
4020         if (oldval && oldlenp) {
4021                 size_t len;
4022                 if (get_user(len, oldlenp))
4023                         return -EFAULT;
4024                 if (len) {
4025                         if (len > table->maxlen)
4026                                 len = table->maxlen;
4027                         if (copy_to_user(oldval, valp, len))
4028                                 return -EFAULT;
4029                         if (put_user(len, oldlenp))
4030                                 return -EFAULT;
4031                 }
4032         }
4033
4034         *valp = new;
4035         return addrconf_fixup_forwarding(table, valp, val);
4036 }
4037
4038 static void dev_disable_change(struct inet6_dev *idev)
4039 {
4040         if (!idev || !idev->dev)
4041                 return;
4042
4043         if (idev->cnf.disable_ipv6)
4044                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4045         else
4046                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4047 }
4048
4049 static void addrconf_disable_change(struct net *net, __s32 newf)
4050 {
4051         struct net_device *dev;
4052         struct inet6_dev *idev;
4053
4054         read_lock(&dev_base_lock);
4055         for_each_netdev(net, dev) {
4056                 rcu_read_lock();
4057                 idev = __in6_dev_get(dev);
4058                 if (idev) {
4059                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4060                         idev->cnf.disable_ipv6 = newf;
4061                         if (changed)
4062                                 dev_disable_change(idev);
4063                 }
4064                 rcu_read_unlock();
4065         }
4066         read_unlock(&dev_base_lock);
4067 }
4068
4069 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4070 {
4071         struct net *net;
4072
4073         net = (struct net *)table->extra2;
4074
4075         if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4076                 return 0;
4077
4078         if (!rtnl_trylock())
4079                 return restart_syscall();
4080
4081         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4082                 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4083                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4084                 addrconf_disable_change(net, newf);
4085         } else if ((!*p) ^ (!old))
4086                 dev_disable_change((struct inet6_dev *)table->extra1);
4087
4088         rtnl_unlock();
4089         return 0;
4090 }
4091
4092 static
4093 int addrconf_sysctl_disable(ctl_table *ctl, int write, struct file * filp,
4094                             void __user *buffer, size_t *lenp, loff_t *ppos)
4095 {
4096         int *valp = ctl->data;
4097         int val = *valp;
4098         int ret;
4099
4100         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
4101
4102         if (write)
4103                 ret = addrconf_disable_ipv6(ctl, valp, val);
4104         return ret;
4105 }
4106
4107 static struct addrconf_sysctl_table
4108 {
4109         struct ctl_table_header *sysctl_header;
4110         ctl_table addrconf_vars[DEVCONF_MAX+1];
4111         char *dev_name;
4112 } addrconf_sysctl __read_mostly = {
4113         .sysctl_header = NULL,
4114         .addrconf_vars = {
4115                 {
4116                         .ctl_name       =       NET_IPV6_FORWARDING,
4117                         .procname       =       "forwarding",
4118                         .data           =       &ipv6_devconf.forwarding,
4119                         .maxlen         =       sizeof(int),
4120                         .mode           =       0644,
4121                         .proc_handler   =       addrconf_sysctl_forward,
4122                         .strategy       =       addrconf_sysctl_forward_strategy,
4123                 },
4124                 {
4125                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
4126                         .procname       =       "hop_limit",
4127                         .data           =       &ipv6_devconf.hop_limit,
4128                         .maxlen         =       sizeof(int),
4129                         .mode           =       0644,
4130                         .proc_handler   =       proc_dointvec,
4131                 },
4132                 {
4133                         .ctl_name       =       NET_IPV6_MTU,
4134                         .procname       =       "mtu",
4135                         .data           =       &ipv6_devconf.mtu6,
4136                         .maxlen         =       sizeof(int),
4137                         .mode           =       0644,
4138                         .proc_handler   =       proc_dointvec,
4139                 },
4140                 {
4141                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
4142                         .procname       =       "accept_ra",
4143                         .data           =       &ipv6_devconf.accept_ra,
4144                         .maxlen         =       sizeof(int),
4145                         .mode           =       0644,
4146                         .proc_handler   =       proc_dointvec,
4147                 },
4148                 {
4149                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
4150                         .procname       =       "accept_redirects",
4151                         .data           =       &ipv6_devconf.accept_redirects,
4152                         .maxlen         =       sizeof(int),
4153                         .mode           =       0644,
4154                         .proc_handler   =       proc_dointvec,
4155                 },
4156                 {
4157                         .ctl_name       =       NET_IPV6_AUTOCONF,
4158                         .procname       =       "autoconf",
4159                         .data           =       &ipv6_devconf.autoconf,
4160                         .maxlen         =       sizeof(int),
4161                         .mode           =       0644,
4162                         .proc_handler   =       proc_dointvec,
4163                 },
4164                 {
4165                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
4166                         .procname       =       "dad_transmits",
4167                         .data           =       &ipv6_devconf.dad_transmits,
4168                         .maxlen         =       sizeof(int),
4169                         .mode           =       0644,
4170                         .proc_handler   =       proc_dointvec,
4171                 },
4172                 {
4173                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
4174                         .procname       =       "router_solicitations",
4175                         .data           =       &ipv6_devconf.rtr_solicits,
4176                         .maxlen         =       sizeof(int),
4177                         .mode           =       0644,
4178                         .proc_handler   =       proc_dointvec,
4179                 },
4180                 {
4181                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
4182                         .procname       =       "router_solicitation_interval",
4183                         .data           =       &ipv6_devconf.rtr_solicit_interval,
4184                         .maxlen         =       sizeof(int),
4185                         .mode           =       0644,
4186                         .proc_handler   =       proc_dointvec_jiffies,
4187                         .strategy       =       sysctl_jiffies,
4188                 },
4189                 {
4190                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
4191                         .procname       =       "router_solicitation_delay",
4192                         .data           =       &ipv6_devconf.rtr_solicit_delay,
4193                         .maxlen         =       sizeof(int),
4194                         .mode           =       0644,
4195                         .proc_handler   =       proc_dointvec_jiffies,
4196                         .strategy       =       sysctl_jiffies,
4197                 },
4198                 {
4199                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
4200                         .procname       =       "force_mld_version",
4201                         .data           =       &ipv6_devconf.force_mld_version,
4202                         .maxlen         =       sizeof(int),
4203                         .mode           =       0644,
4204                         .proc_handler   =       proc_dointvec,
4205                 },
4206 #ifdef CONFIG_IPV6_PRIVACY
4207                 {
4208                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
4209                         .procname       =       "use_tempaddr",
4210                         .data           =       &ipv6_devconf.use_tempaddr,
4211                         .maxlen         =       sizeof(int),
4212                         .mode           =       0644,
4213                         .proc_handler   =       proc_dointvec,
4214                 },
4215                 {
4216                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
4217                         .procname       =       "temp_valid_lft",
4218                         .data           =       &ipv6_devconf.temp_valid_lft,
4219                         .maxlen         =       sizeof(int),
4220                         .mode           =       0644,
4221                         .proc_handler   =       proc_dointvec,
4222                 },
4223                 {
4224                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4225                         .procname       =       "temp_prefered_lft",
4226                         .data           =       &ipv6_devconf.temp_prefered_lft,
4227                         .maxlen         =       sizeof(int),
4228                         .mode           =       0644,
4229                         .proc_handler   =       proc_dointvec,
4230                 },
4231                 {
4232                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4233                         .procname       =       "regen_max_retry",
4234                         .data           =       &ipv6_devconf.regen_max_retry,
4235                         .maxlen         =       sizeof(int),
4236                         .mode           =       0644,
4237                         .proc_handler   =       proc_dointvec,
4238                 },
4239                 {
4240                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4241                         .procname       =       "max_desync_factor",
4242                         .data           =       &ipv6_devconf.max_desync_factor,
4243                         .maxlen         =       sizeof(int),
4244                         .mode           =       0644,
4245                         .proc_handler   =       proc_dointvec,
4246                 },
4247 #endif
4248                 {
4249                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4250                         .procname       =       "max_addresses",
4251                         .data           =       &ipv6_devconf.max_addresses,
4252                         .maxlen         =       sizeof(int),
4253                         .mode           =       0644,
4254                         .proc_handler   =       proc_dointvec,
4255                 },
4256                 {
4257                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4258                         .procname       =       "accept_ra_defrtr",
4259                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4260                         .maxlen         =       sizeof(int),
4261                         .mode           =       0644,
4262                         .proc_handler   =       proc_dointvec,
4263                 },
4264                 {
4265                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4266                         .procname       =       "accept_ra_pinfo",
4267                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4268                         .maxlen         =       sizeof(int),
4269                         .mode           =       0644,
4270                         .proc_handler   =       proc_dointvec,
4271                 },
4272 #ifdef CONFIG_IPV6_ROUTER_PREF
4273                 {
4274                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4275                         .procname       =       "accept_ra_rtr_pref",
4276                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4277                         .maxlen         =       sizeof(int),
4278                         .mode           =       0644,
4279                         .proc_handler   =       proc_dointvec,
4280                 },
4281                 {
4282                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4283                         .procname       =       "router_probe_interval",
4284                         .data           =       &ipv6_devconf.rtr_probe_interval,
4285                         .maxlen         =       sizeof(int),
4286                         .mode           =       0644,
4287                         .proc_handler   =       proc_dointvec_jiffies,
4288                         .strategy       =       sysctl_jiffies,
4289                 },
4290 #ifdef CONFIG_IPV6_ROUTE_INFO
4291                 {
4292                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4293                         .procname       =       "accept_ra_rt_info_max_plen",
4294                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4295                         .maxlen         =       sizeof(int),
4296                         .mode           =       0644,
4297                         .proc_handler   =       proc_dointvec,
4298                 },
4299 #endif
4300 #endif
4301                 {
4302                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4303                         .procname       =       "proxy_ndp",
4304                         .data           =       &ipv6_devconf.proxy_ndp,
4305                         .maxlen         =       sizeof(int),
4306                         .mode           =       0644,
4307                         .proc_handler   =       proc_dointvec,
4308                 },
4309                 {
4310                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4311                         .procname       =       "accept_source_route",
4312                         .data           =       &ipv6_devconf.accept_source_route,
4313                         .maxlen         =       sizeof(int),
4314                         .mode           =       0644,
4315                         .proc_handler   =       proc_dointvec,
4316                 },
4317 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4318                 {
4319                         .ctl_name       =       CTL_UNNUMBERED,
4320                         .procname       =       "optimistic_dad",
4321                         .data           =       &ipv6_devconf.optimistic_dad,
4322                         .maxlen         =       sizeof(int),
4323                         .mode           =       0644,
4324                         .proc_handler   =       proc_dointvec,
4325
4326                 },
4327 #endif
4328 #ifdef CONFIG_IPV6_MROUTE
4329                 {
4330                         .ctl_name       =       CTL_UNNUMBERED,
4331                         .procname       =       "mc_forwarding",
4332                         .data           =       &ipv6_devconf.mc_forwarding,
4333                         .maxlen         =       sizeof(int),
4334                         .mode           =       0444,
4335                         .proc_handler   =       proc_dointvec,
4336                 },
4337 #endif
4338                 {
4339                         .ctl_name       =       CTL_UNNUMBERED,
4340                         .procname       =       "disable_ipv6",
4341                         .data           =       &ipv6_devconf.disable_ipv6,
4342                         .maxlen         =       sizeof(int),
4343                         .mode           =       0644,
4344                         .proc_handler   =       addrconf_sysctl_disable,
4345                         .strategy       =       sysctl_intvec,
4346                 },
4347                 {
4348                         .ctl_name       =       CTL_UNNUMBERED,
4349                         .procname       =       "accept_dad",
4350                         .data           =       &ipv6_devconf.accept_dad,
4351                         .maxlen         =       sizeof(int),
4352                         .mode           =       0644,
4353                         .proc_handler   =       proc_dointvec,
4354                 },
4355                 {
4356                         .ctl_name       =       0,      /* sentinel */
4357                 }
4358         },
4359 };
4360
4361 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4362                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4363 {
4364         int i;
4365         struct addrconf_sysctl_table *t;
4366
4367 #define ADDRCONF_CTL_PATH_DEV   3
4368
4369         struct ctl_path addrconf_ctl_path[] = {
4370                 { .procname = "net", .ctl_name = CTL_NET, },
4371                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4372                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4373                 { /* to be set */ },
4374                 { },
4375         };
4376
4377
4378         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4379         if (t == NULL)
4380                 goto out;
4381
4382         for (i=0; t->addrconf_vars[i].data; i++) {
4383                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4384                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4385                 t->addrconf_vars[i].extra2 = net;
4386         }
4387
4388         /*
4389          * Make a copy of dev_name, because '.procname' is regarded as const
4390          * by sysctl and we wouldn't want anyone to change it under our feet
4391          * (see SIOCSIFNAME).
4392          */
4393         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4394         if (!t->dev_name)
4395                 goto free;
4396
4397         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4398         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4399
4400         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4401                         t->addrconf_vars);
4402         if (t->sysctl_header == NULL)
4403                 goto free_procname;
4404
4405         p->sysctl = t;
4406         return 0;
4407
4408 free_procname:
4409         kfree(t->dev_name);
4410 free:
4411         kfree(t);
4412 out:
4413         return -ENOBUFS;
4414 }
4415
4416 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4417 {
4418         struct addrconf_sysctl_table *t;
4419
4420         if (p->sysctl == NULL)
4421                 return;
4422
4423         t = p->sysctl;
4424         p->sysctl = NULL;
4425         unregister_sysctl_table(t->sysctl_header);
4426         kfree(t->dev_name);
4427         kfree(t);
4428 }
4429
4430 static void addrconf_sysctl_register(struct inet6_dev *idev)
4431 {
4432         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4433                               NET_IPV6_NEIGH, "ipv6",
4434                               &ndisc_ifinfo_sysctl_change,
4435                               ndisc_ifinfo_sysctl_strategy);
4436         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4437                         idev->dev->ifindex, idev, &idev->cnf);
4438 }
4439
4440 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4441 {
4442         __addrconf_sysctl_unregister(&idev->cnf);
4443         neigh_sysctl_unregister(idev->nd_parms);
4444 }
4445
4446
4447 #endif
4448
4449 static int addrconf_init_net(struct net *net)
4450 {
4451         int err;
4452         struct ipv6_devconf *all, *dflt;
4453
4454         err = -ENOMEM;
4455         all = &ipv6_devconf;
4456         dflt = &ipv6_devconf_dflt;
4457
4458         if (net != &init_net) {
4459                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4460                 if (all == NULL)
4461                         goto err_alloc_all;
4462
4463                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4464                 if (dflt == NULL)
4465                         goto err_alloc_dflt;
4466         } else {
4467                 /* these will be inherited by all namespaces */
4468                 dflt->autoconf = ipv6_defaults.autoconf;
4469                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4470         }
4471
4472         net->ipv6.devconf_all = all;
4473         net->ipv6.devconf_dflt = dflt;
4474
4475 #ifdef CONFIG_SYSCTL
4476         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4477                         NULL, all);
4478         if (err < 0)
4479                 goto err_reg_all;
4480
4481         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4482                         NULL, dflt);
4483         if (err < 0)
4484                 goto err_reg_dflt;
4485 #endif
4486         return 0;
4487
4488 #ifdef CONFIG_SYSCTL
4489 err_reg_dflt:
4490         __addrconf_sysctl_unregister(all);
4491 err_reg_all:
4492         kfree(dflt);
4493 #endif
4494 err_alloc_dflt:
4495         kfree(all);
4496 err_alloc_all:
4497         return err;
4498 }
4499
4500 static void addrconf_exit_net(struct net *net)
4501 {
4502 #ifdef CONFIG_SYSCTL
4503         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4504         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4505 #endif
4506         if (net != &init_net) {
4507                 kfree(net->ipv6.devconf_dflt);
4508                 kfree(net->ipv6.devconf_all);
4509         }
4510 }
4511
4512 static struct pernet_operations addrconf_ops = {
4513         .init = addrconf_init_net,
4514         .exit = addrconf_exit_net,
4515 };
4516
4517 /*
4518  *      Device notifier
4519  */
4520
4521 int register_inet6addr_notifier(struct notifier_block *nb)
4522 {
4523         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4524 }
4525
4526 EXPORT_SYMBOL(register_inet6addr_notifier);
4527
4528 int unregister_inet6addr_notifier(struct notifier_block *nb)
4529 {
4530         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4531 }
4532
4533 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4534
4535 /*
4536  *      Init / cleanup code
4537  */
4538
4539 int __init addrconf_init(void)
4540 {
4541         int err;
4542
4543         if ((err = ipv6_addr_label_init()) < 0) {
4544                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4545                         err);
4546                 return err;
4547         }
4548
4549         register_pernet_subsys(&addrconf_ops);
4550
4551         /* The addrconf netdev notifier requires that loopback_dev
4552          * has it's ipv6 private information allocated and setup
4553          * before it can bring up and give link-local addresses
4554          * to other devices which are up.
4555          *
4556          * Unfortunately, loopback_dev is not necessarily the first
4557          * entry in the global dev_base list of net devices.  In fact,
4558          * it is likely to be the very last entry on that list.
4559          * So this causes the notifier registry below to try and
4560          * give link-local addresses to all devices besides loopback_dev
4561          * first, then loopback_dev, which cases all the non-loopback_dev
4562          * devices to fail to get a link-local address.
4563          *
4564          * So, as a temporary fix, allocate the ipv6 structure for
4565          * loopback_dev first by hand.
4566          * Longer term, all of the dependencies ipv6 has upon the loopback
4567          * device and it being up should be removed.
4568          */
4569         rtnl_lock();
4570         if (!ipv6_add_dev(init_net.loopback_dev))
4571                 err = -ENOMEM;
4572         rtnl_unlock();
4573         if (err)
4574                 goto errlo;
4575
4576         register_netdevice_notifier(&ipv6_dev_notf);
4577
4578         addrconf_verify(0);
4579
4580         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4581         if (err < 0)
4582                 goto errout;
4583
4584         /* Only the first call to __rtnl_register can fail */
4585         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4586         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4587         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4588         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4589         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4590
4591         ipv6_addr_label_rtnl_register();
4592
4593         return 0;
4594 errout:
4595         unregister_netdevice_notifier(&ipv6_dev_notf);
4596 errlo:
4597         unregister_pernet_subsys(&addrconf_ops);
4598
4599         return err;
4600 }
4601
4602 void addrconf_cleanup(void)
4603 {
4604         struct inet6_ifaddr *ifa;
4605         struct net_device *dev;
4606         int i;
4607
4608         unregister_netdevice_notifier(&ipv6_dev_notf);
4609         unregister_pernet_subsys(&addrconf_ops);
4610
4611         rtnl_lock();
4612
4613         /* clean dev list */
4614         for_each_netdev(&init_net, dev) {
4615                 if (__in6_dev_get(dev) == NULL)
4616                         continue;
4617                 addrconf_ifdown(dev, 1);
4618         }
4619         addrconf_ifdown(init_net.loopback_dev, 2);
4620
4621         /*
4622          *      Check hash table.
4623          */
4624         write_lock_bh(&addrconf_hash_lock);
4625         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4626                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4627                         struct inet6_ifaddr *bifa;
4628
4629                         bifa = ifa;
4630                         ifa = ifa->lst_next;
4631                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4632                         /* Do not free it; something is wrong.
4633                            Now we can investigate it with debugger.
4634                          */
4635                 }
4636         }
4637         write_unlock_bh(&addrconf_hash_lock);
4638
4639         del_timer(&addr_chk_timer);
4640         rtnl_unlock();
4641 }