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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/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/net.h>
  46 #include <linux/in6.h>
  47 #include <linux/netdevice.h>
  48 #include <linux/if_addr.h>
  49 #include <linux/if_arp.h>
  50 #include <linux/if_arcnet.h>
  51 #include <linux/if_infiniband.h>
  52 #include <linux/route.h>
  53 #include <linux/inetdevice.h>
  54 #include <linux/init.h>
  55 #ifdef CONFIG_SYSCTL
  56 #include <linux/sysctl.h>
  57 #endif
  58 #include <linux/capability.h>
  59 #include <linux/delay.h>
  60 #include <linux/notifier.h>
  61 #include <linux/string.h>
  62
  63 #include <net/net_namespace.h>
  64 #include <net/sock.h>
  65 #include <net/snmp.h>
  66
  67 #include <net/ipv6.h>
  68 #include <net/protocol.h>
  69 #include <net/ndisc.h>
  70 #include <net/ip6_route.h>
  71 #include <net/addrconf.h>
  72 #include <net/tcp.h>
  73 #include <net/ip.h>
  74 #include <net/netlink.h>
  75 #include <net/pkt_sched.h>
  76 #include <linux/if_tunnel.h>
  77 #include <linux/rtnetlink.h>
  78
  79 #ifdef CONFIG_IPV6_PRIVACY
  80 #include <linux/random.h>
  81 #endif
  82
  83 #include <asm/uaccess.h>
  84 #include <asm/unaligned.h>
  85
  86 #include <linux/proc_fs.h>
  87 #include <linux/seq_file.h>
  88
  89 /* Set to 3 to get tracing... */
  90 #define ACONF_DEBUG 2
  91
  92 #if ACONF_DEBUG >= 3
  93 #define ADBG(x) printk x
  94 #else
  95 #define ADBG(x)
  96 #endif
  97
  98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 100
 101 #ifdef CONFIG_SYSCTL
 102 static void addrconf_sysctl_register(struct inet6_dev *idev);
 103 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 104 #else
 105 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 106 {
 107 }
 108
 109 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 110 {
 111 }
 112 #endif
 113
 114 #ifdef CONFIG_IPV6_PRIVACY
 115 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 116 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 117 static void ipv6_regen_rndid(unsigned long data);
 118
 119 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 120 #endif
 121
 122 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 123 static int ipv6_count_addresses(struct inet6_dev *idev);
 124
 125 /*
 126  *      Configured unicast address hash table
 127  */
 128 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 129 static DEFINE_RWLOCK(addrconf_hash_lock);
 130
 131 static void addrconf_verify(unsigned long);
 132
 133 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 134 static DEFINE_SPINLOCK(addrconf_verify_lock);
 135
 136 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 137 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 138
 139 static int addrconf_ifdown(struct net_device *dev, int how);
 140
 141 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 142 static void addrconf_dad_timer(unsigned long data);
 143 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 144 static void addrconf_dad_run(struct inet6_dev *idev);
 145 static void addrconf_rs_timer(unsigned long data);
 146 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 147 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 148
 149 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 150                                 struct prefix_info *pinfo);
 151 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 152                               struct net_device *dev);
 153
 154 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 155
 156 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 157         .forwarding             = 0,
 158         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 159         .mtu6                   = IPV6_MIN_MTU,
 160         .accept_ra              = 1,
 161         .accept_redirects       = 1,
 162         .autoconf               = 1,
 163         .force_mld_version      = 0,
 164         .dad_transmits          = 1,
 165         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 166         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 167         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 168 #ifdef CONFIG_IPV6_PRIVACY
 169         .use_tempaddr           = 0,
 170         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 171         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 172         .regen_max_retry        = REGEN_MAX_RETRY,
 173         .max_desync_factor      = MAX_DESYNC_FACTOR,
 174 #endif
 175         .max_addresses          = IPV6_MAX_ADDRESSES,
 176         .accept_ra_defrtr       = 1,
 177         .accept_ra_pinfo        = 1,
 178 #ifdef CONFIG_IPV6_ROUTER_PREF
 179         .accept_ra_rtr_pref     = 1,
 180         .rtr_probe_interval     = 60 * HZ,
 181 #ifdef CONFIG_IPV6_ROUTE_INFO
 182         .accept_ra_rt_info_max_plen = 0,
 183 #endif
 184 #endif
 185         .proxy_ndp              = 0,
 186         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 187         .disable_ipv6           = 0,
 188         .accept_dad             = 1,
 189 };
 190
 191 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 192         .forwarding             = 0,
 193         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 194         .mtu6                   = IPV6_MIN_MTU,
 195         .accept_ra              = 1,
 196         .accept_redirects       = 1,
 197         .autoconf               = 1,
 198         .dad_transmits          = 1,
 199         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 200         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 201         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 202 #ifdef CONFIG_IPV6_PRIVACY
 203         .use_tempaddr           = 0,
 204         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 205         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 206         .regen_max_retry        = REGEN_MAX_RETRY,
 207         .max_desync_factor      = MAX_DESYNC_FACTOR,
 208 #endif
 209         .max_addresses          = IPV6_MAX_ADDRESSES,
 210         .accept_ra_defrtr       = 1,
 211         .accept_ra_pinfo        = 1,
 212 #ifdef CONFIG_IPV6_ROUTER_PREF
 213         .accept_ra_rtr_pref     = 1,
 214         .rtr_probe_interval     = 60 * HZ,
 215 #ifdef CONFIG_IPV6_ROUTE_INFO
 216         .accept_ra_rt_info_max_plen = 0,
 217 #endif
 218 #endif
 219         .proxy_ndp              = 0,
 220         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 221         .disable_ipv6           = 0,
 222         .accept_dad             = 1,
 223 };
 224
 225 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 226 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 227 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 228 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 229 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 230
 231 /* Check if a valid qdisc is available */
 232 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 233 {
 234         return !qdisc_tx_is_noop(dev);
 235 }
 236
 237 /* Check if a route is valid prefix route */
 238 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 239 {
 240         return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
 241 }
 242
 243 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 244 {
 245         if (del_timer(&ifp->timer))
 246                 __in6_ifa_put(ifp);
 247 }
 248
 249 enum addrconf_timer_t
 250 {
 251         AC_NONE,
 252         AC_DAD,
 253         AC_RS,
 254 };
 255
 256 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 257                                enum addrconf_timer_t what,
 258                                unsigned long when)
 259 {
 260         if (!del_timer(&ifp->timer))
 261                 in6_ifa_hold(ifp);
 262
 263         switch (what) {
 264         case AC_DAD:
 265                 ifp->timer.function = addrconf_dad_timer;
 266                 break;
 267         case AC_RS:
 268                 ifp->timer.function = addrconf_rs_timer;
 269                 break;
 270         default:;
 271         }
 272         ifp->timer.expires = jiffies + when;
 273         add_timer(&ifp->timer);
 274 }
 275
 276 static int snmp6_alloc_dev(struct inet6_dev *idev)
 277 {
 278         if (snmp_mib_init((void **)idev->stats.ipv6,
 279                           sizeof(struct ipstats_mib)) < 0)
 280                 goto err_ip;
 281         if (snmp_mib_init((void **)idev->stats.icmpv6,
 282                           sizeof(struct icmpv6_mib)) < 0)
 283                 goto err_icmp;
 284         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 285                           sizeof(struct icmpv6msg_mib)) < 0)
 286                 goto err_icmpmsg;
 287
 288         return 0;
 289
 290 err_icmpmsg:
 291         snmp_mib_free((void **)idev->stats.icmpv6);
 292 err_icmp:
 293         snmp_mib_free((void **)idev->stats.ipv6);
 294 err_ip:
 295         return -ENOMEM;
 296 }
 297
 298 static void snmp6_free_dev(struct inet6_dev *idev)
 299 {
 300         snmp_mib_free((void **)idev->stats.icmpv6msg);
 301         snmp_mib_free((void **)idev->stats.icmpv6);
 302         snmp_mib_free((void **)idev->stats.ipv6);
 303 }
 304
 305 /* Nobody refers to this device, we may destroy it. */
 306
 307 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 308 {
 309         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 310         kfree(idev);
 311 }
 312
 313 void in6_dev_finish_destroy(struct inet6_dev *idev)
 314 {
 315         struct net_device *dev = idev->dev;
 316
 317         WARN_ON(idev->addr_list != NULL);
 318         WARN_ON(idev->mc_list != NULL);
 319
 320 #ifdef NET_REFCNT_DEBUG
 321         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 322 #endif
 323         dev_put(dev);
 324         if (!idev->dead) {
 325                 printk("Freeing alive inet6 device %p\n", idev);
 326                 return;
 327         }
 328         snmp6_free_dev(idev);
 329         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 330 }
 331
 332 EXPORT_SYMBOL(in6_dev_finish_destroy);
 333
 334 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 335 {
 336         struct inet6_dev *ndev;
 337
 338         ASSERT_RTNL();
 339
 340         if (dev->mtu < IPV6_MIN_MTU)
 341                 return NULL;
 342
 343         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 344
 345         if (ndev == NULL)
 346                 return NULL;
 347
 348         rwlock_init(&ndev->lock);
 349         ndev->dev = dev;
 350         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 351         ndev->cnf.mtu6 = dev->mtu;
 352         ndev->cnf.sysctl = NULL;
 353         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 354         if (ndev->nd_parms == NULL) {
 355                 kfree(ndev);
 356                 return NULL;
 357         }
 358         if (ndev->cnf.forwarding)
 359                 dev_disable_lro(dev);
 360         /* We refer to the device */
 361         dev_hold(dev);
 362
 363         if (snmp6_alloc_dev(ndev) < 0) {
 364                 ADBG((KERN_WARNING
 365                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 366                         __func__, dev->name));
 367                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 368                 ndev->dead = 1;
 369                 in6_dev_finish_destroy(ndev);
 370                 return NULL;
 371         }
 372
 373         if (snmp6_register_dev(ndev) < 0) {
 374                 ADBG((KERN_WARNING
 375                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 376                         __func__, dev->name));
 377                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 378                 ndev->dead = 1;
 379                 in6_dev_finish_destroy(ndev);
 380                 return NULL;
 381         }
 382
 383         /* One reference from device.  We must do this before
 384          * we invoke __ipv6_regen_rndid().
 385          */
 386         in6_dev_hold(ndev);
 387
 388         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 389                 ndev->cnf.accept_dad = -1;
 390
 391 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 392         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 393                 printk(KERN_INFO
 394                        "%s: Disabled Multicast RS\n",
 395                        dev->name);
 396                 ndev->cnf.rtr_solicits = 0;
 397         }
 398 #endif
 399
 400 #ifdef CONFIG_IPV6_PRIVACY
 401         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 402         if ((dev->flags&IFF_LOOPBACK) ||
 403             dev->type == ARPHRD_TUNNEL ||
 404             dev->type == ARPHRD_TUNNEL6 ||
 405             dev->type == ARPHRD_SIT ||
 406             dev->type == ARPHRD_NONE) {
 407                 printk(KERN_INFO
 408                        "%s: Disabled Privacy Extensions\n",
 409                        dev->name);
 410                 ndev->cnf.use_tempaddr = -1;
 411         } else {
 412                 in6_dev_hold(ndev);
 413                 ipv6_regen_rndid((unsigned long) ndev);
 414         }
 415 #endif
 416
 417         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 418                 ndev->if_flags |= IF_READY;
 419
 420         ipv6_mc_init_dev(ndev);
 421         ndev->tstamp = jiffies;
 422         addrconf_sysctl_register(ndev);
 423         /* protected by rtnl_lock */
 424         rcu_assign_pointer(dev->ip6_ptr, ndev);
 425
 426         /* Join all-node multicast group */
 427         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 428
 429         return ndev;
 430 }
 431
 432 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 433 {
 434         struct inet6_dev *idev;
 435
 436         ASSERT_RTNL();
 437
 438         if ((idev = __in6_dev_get(dev)) == NULL) {
 439                 if ((idev = ipv6_add_dev(dev)) == NULL)
 440                         return NULL;
 441         }
 442
 443         if (dev->flags&IFF_UP)
 444                 ipv6_mc_up(idev);
 445         return idev;
 446 }
 447
 448 #ifdef CONFIG_SYSCTL
 449 static void dev_forward_change(struct inet6_dev *idev)
 450 {
 451         struct net_device *dev;
 452         struct inet6_ifaddr *ifa;
 453
 454         if (!idev)
 455                 return;
 456         dev = idev->dev;
 457         if (idev->cnf.forwarding)
 458                 dev_disable_lro(dev);
 459         if (dev && (dev->flags & IFF_MULTICAST)) {
 460                 if (idev->cnf.forwarding)
 461                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 462                 else
 463                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 464         }
 465         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 466                 if (ifa->flags&IFA_F_TENTATIVE)
 467                         continue;
 468                 if (idev->cnf.forwarding)
 469                         addrconf_join_anycast(ifa);
 470                 else
 471                         addrconf_leave_anycast(ifa);
 472         }
 473 }
 474
 475
 476 static void addrconf_forward_change(struct net *net, __s32 newf)
 477 {
 478         struct net_device *dev;
 479         struct inet6_dev *idev;
 480
 481         read_lock(&dev_base_lock);
 482         for_each_netdev(net, dev) {
 483                 rcu_read_lock();
 484                 idev = __in6_dev_get(dev);
 485                 if (idev) {
 486                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 487                         idev->cnf.forwarding = newf;
 488                         if (changed)
 489                                 dev_forward_change(idev);
 490                 }
 491                 rcu_read_unlock();
 492         }
 493         read_unlock(&dev_base_lock);
 494 }
 495
 496 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 497 {
 498         struct net *net;
 499
 500         net = (struct net *)table->extra2;
 501         if (p == &net->ipv6.devconf_dflt->forwarding)
 502                 return;
 503
 504         rtnl_lock();
 505         if (p == &net->ipv6.devconf_all->forwarding) {
 506                 __s32 newf = net->ipv6.devconf_all->forwarding;
 507                 net->ipv6.devconf_dflt->forwarding = newf;
 508                 addrconf_forward_change(net, newf);
 509         } else if ((!*p) ^ (!old))
 510                 dev_forward_change((struct inet6_dev *)table->extra1);
 511         rtnl_unlock();
 512
 513         if (*p)
 514                 rt6_purge_dflt_routers(net);
 515 }
 516 #endif
 517
 518 /* Nobody refers to this ifaddr, destroy it */
 519
 520 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 521 {
 522         WARN_ON(ifp->if_next != NULL);
 523         WARN_ON(ifp->lst_next != NULL);
 524
 525 #ifdef NET_REFCNT_DEBUG
 526         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 527 #endif
 528
 529         in6_dev_put(ifp->idev);
 530
 531         if (del_timer(&ifp->timer))
 532                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 533
 534         if (!ifp->dead) {
 535                 printk("Freeing alive inet6 address %p\n", ifp);
 536                 return;
 537         }
 538         dst_release(&ifp->rt->u.dst);
 539
 540         kfree(ifp);
 541 }
 542
 543 static void
 544 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 545 {
 546         struct inet6_ifaddr *ifa, **ifap;
 547         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 548
 549         /*
 550          * Each device address list is sorted in order of scope -
 551          * global before linklocal.
 552          */
 553         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 554              ifap = &ifa->if_next) {
 555                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 556                         break;
 557         }
 558
 559         ifp->if_next = *ifap;
 560         *ifap = ifp;
 561 }
 562
 563 /*
 564  *      Hash function taken from net_alias.c
 565  */
 566 static u8 ipv6_addr_hash(const struct in6_addr *addr)
 567 {
 568         __u32 word;
 569
 570         /*
 571          * We perform the hash function over the last 64 bits of the address
 572          * This will include the IEEE address token on links that support it.
 573          */
 574
 575         word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
 576         word ^= (word >> 16);
 577         word ^= (word >> 8);
 578
 579         return ((word ^ (word >> 4)) & 0x0f);
 580 }
 581
 582 /* On success it returns ifp with increased reference count */
 583
 584 static struct inet6_ifaddr *
 585 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 586               int scope, u32 flags)
 587 {
 588         struct inet6_ifaddr *ifa = NULL;
 589         struct rt6_info *rt;
 590         int hash;
 591         int err = 0;
 592         int addr_type = ipv6_addr_type(addr);
 593
 594         if (addr_type == IPV6_ADDR_ANY ||
 595             addr_type & IPV6_ADDR_MULTICAST ||
 596             (!(idev->dev->flags & IFF_LOOPBACK) &&
 597              addr_type & IPV6_ADDR_LOOPBACK))
 598                 return ERR_PTR(-EADDRNOTAVAIL);
 599
 600         rcu_read_lock_bh();
 601         if (idev->dead) {
 602                 err = -ENODEV;                  /*XXX*/
 603                 goto out2;
 604         }
 605
 606         write_lock(&addrconf_hash_lock);
 607
 608         /* Ignore adding duplicate addresses on an interface */
 609         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 610                 ADBG(("ipv6_add_addr: already assigned\n"));
 611                 err = -EEXIST;
 612                 goto out;
 613         }
 614
 615         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 616
 617         if (ifa == NULL) {
 618                 ADBG(("ipv6_add_addr: malloc failed\n"));
 619                 err = -ENOBUFS;
 620                 goto out;
 621         }
 622
 623         rt = addrconf_dst_alloc(idev, addr, 0);
 624         if (IS_ERR(rt)) {
 625                 err = PTR_ERR(rt);
 626                 goto out;
 627         }
 628
 629         ipv6_addr_copy(&ifa->addr, addr);
 630
 631         spin_lock_init(&ifa->lock);
 632         init_timer(&ifa->timer);
 633         ifa->timer.data = (unsigned long) ifa;
 634         ifa->scope = scope;
 635         ifa->prefix_len = pfxlen;
 636         ifa->flags = flags | IFA_F_TENTATIVE;
 637         ifa->cstamp = ifa->tstamp = jiffies;
 638
 639         ifa->rt = rt;
 640
 641         /*
 642          * part one of RFC 4429, section 3.3
 643          * We should not configure an address as
 644          * optimistic if we do not yet know the link
 645          * layer address of our nexhop router
 646          */
 647
 648         if (rt->rt6i_nexthop == NULL)
 649                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 650
 651         ifa->idev = idev;
 652         in6_dev_hold(idev);
 653         /* For caller */
 654         in6_ifa_hold(ifa);
 655
 656         /* Add to big hash table */
 657         hash = ipv6_addr_hash(addr);
 658
 659         ifa->lst_next = inet6_addr_lst[hash];
 660         inet6_addr_lst[hash] = ifa;
 661         in6_ifa_hold(ifa);
 662         write_unlock(&addrconf_hash_lock);
 663
 664         write_lock(&idev->lock);
 665         /* Add to inet6_dev unicast addr list. */
 666         ipv6_link_dev_addr(idev, ifa);
 667
 668 #ifdef CONFIG_IPV6_PRIVACY
 669         if (ifa->flags&IFA_F_TEMPORARY) {
 670                 ifa->tmp_next = idev->tempaddr_list;
 671                 idev->tempaddr_list = ifa;
 672                 in6_ifa_hold(ifa);
 673         }
 674 #endif
 675
 676         in6_ifa_hold(ifa);
 677         write_unlock(&idev->lock);
 678 out2:
 679         rcu_read_unlock_bh();
 680
 681         if (likely(err == 0))
 682                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 683         else {
 684                 kfree(ifa);
 685                 ifa = ERR_PTR(err);
 686         }
 687
 688         return ifa;
 689 out:
 690         write_unlock(&addrconf_hash_lock);
 691         goto out2;
 692 }
 693
 694 /* This function wants to get referenced ifp and releases it before return */
 695
 696 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 697 {
 698         struct inet6_ifaddr *ifa, **ifap;
 699         struct inet6_dev *idev = ifp->idev;
 700         int hash;
 701         int deleted = 0, onlink = 0;
 702         unsigned long expires = jiffies;
 703
 704         hash = ipv6_addr_hash(&ifp->addr);
 705
 706         ifp->dead = 1;
 707
 708         write_lock_bh(&addrconf_hash_lock);
 709         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 710              ifap = &ifa->lst_next) {
 711                 if (ifa == ifp) {
 712                         *ifap = ifa->lst_next;
 713                         __in6_ifa_put(ifp);
 714                         ifa->lst_next = NULL;
 715                         break;
 716                 }
 717         }
 718         write_unlock_bh(&addrconf_hash_lock);
 719
 720         write_lock_bh(&idev->lock);
 721 #ifdef CONFIG_IPV6_PRIVACY
 722         if (ifp->flags&IFA_F_TEMPORARY) {
 723                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 724                      ifap = &ifa->tmp_next) {
 725                         if (ifa == ifp) {
 726                                 *ifap = ifa->tmp_next;
 727                                 if (ifp->ifpub) {
 728                                         in6_ifa_put(ifp->ifpub);
 729                                         ifp->ifpub = NULL;
 730                                 }
 731                                 __in6_ifa_put(ifp);
 732                                 ifa->tmp_next = NULL;
 733                                 break;
 734                         }
 735                 }
 736         }
 737 #endif
 738
 739         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 740                 if (ifa == ifp) {
 741                         *ifap = ifa->if_next;
 742                         __in6_ifa_put(ifp);
 743                         ifa->if_next = NULL;
 744                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 745                                 break;
 746                         deleted = 1;
 747                         continue;
 748                 } else if (ifp->flags & IFA_F_PERMANENT) {
 749                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 750                                               ifp->prefix_len)) {
 751                                 if (ifa->flags & IFA_F_PERMANENT) {
 752                                         onlink = 1;
 753                                         if (deleted)
 754                                                 break;
 755                                 } else {
 756                                         unsigned long lifetime;
 757
 758                                         if (!onlink)
 759                                                 onlink = -1;
 760
 761                                         spin_lock(&ifa->lock);
 762
 763                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 764                                         /*
 765                                          * Note: Because this address is
 766                                          * not permanent, lifetime <
 767                                          * LONG_MAX / HZ here.
 768                                          */
 769                                         if (time_before(expires,
 770                                                         ifa->tstamp + lifetime * HZ))
 771                                                 expires = ifa->tstamp + lifetime * HZ;
 772                                         spin_unlock(&ifa->lock);
 773                                 }
 774                         }
 775                 }
 776                 ifap = &ifa->if_next;
 777         }
 778         write_unlock_bh(&idev->lock);
 779
 780         addrconf_del_timer(ifp);
 781
 782         ipv6_ifa_notify(RTM_DELADDR, ifp);
 783
 784         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 785
 786         /*
 787          * Purge or update corresponding prefix
 788          *
 789          * 1) we don't purge prefix here if address was not permanent.
 790          *    prefix is managed by its own lifetime.
 791          * 2) if there're no addresses, delete prefix.
 792          * 3) if there're still other permanent address(es),
 793          *    corresponding prefix is still permanent.
 794          * 4) otherwise, update prefix lifetime to the
 795          *    longest valid lifetime among the corresponding
 796          *    addresses on the device.
 797          *    Note: subsequent RA will update lifetime.
 798          *
 799          * --yoshfuji
 800          */
 801         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 802                 struct in6_addr prefix;
 803                 struct rt6_info *rt;
 804                 struct net *net = dev_net(ifp->idev->dev);
 805                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 806                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 807
 808                 if (rt && addrconf_is_prefix_route(rt)) {
 809                         if (onlink == 0) {
 810                                 ip6_del_rt(rt);
 811                                 rt = NULL;
 812                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 813                                 rt->rt6i_expires = expires;
 814                                 rt->rt6i_flags |= RTF_EXPIRES;
 815                         }
 816                 }
 817                 dst_release(&rt->u.dst);
 818         }
 819
 820         in6_ifa_put(ifp);
 821 }
 822
 823 #ifdef CONFIG_IPV6_PRIVACY
 824 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 825 {
 826         struct inet6_dev *idev = ifp->idev;
 827         struct in6_addr addr, *tmpaddr;
 828         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 829         unsigned long regen_advance;
 830         int tmp_plen;
 831         int ret = 0;
 832         int max_addresses;
 833         u32 addr_flags;
 834
 835         write_lock(&idev->lock);
 836         if (ift) {
 837                 spin_lock_bh(&ift->lock);
 838                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 839                 spin_unlock_bh(&ift->lock);
 840                 tmpaddr = &addr;
 841         } else {
 842                 tmpaddr = NULL;
 843         }
 844 retry:
 845         in6_dev_hold(idev);
 846         if (idev->cnf.use_tempaddr <= 0) {
 847                 write_unlock(&idev->lock);
 848                 printk(KERN_INFO
 849                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 850                 in6_dev_put(idev);
 851                 ret = -1;
 852                 goto out;
 853         }
 854         spin_lock_bh(&ifp->lock);
 855         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 856                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 857                 spin_unlock_bh(&ifp->lock);
 858                 write_unlock(&idev->lock);
 859                 printk(KERN_WARNING
 860                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 861                 in6_dev_put(idev);
 862                 ret = -1;
 863                 goto out;
 864         }
 865         in6_ifa_hold(ifp);
 866         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 867         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 868                 spin_unlock_bh(&ifp->lock);
 869                 write_unlock(&idev->lock);
 870                 printk(KERN_WARNING
 871                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 872                 in6_ifa_put(ifp);
 873                 in6_dev_put(idev);
 874                 ret = -1;
 875                 goto out;
 876         }
 877         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 878         tmp_valid_lft = min_t(__u32,
 879                               ifp->valid_lft,
 880                               idev->cnf.temp_valid_lft);
 881         tmp_prefered_lft = min_t(__u32,
 882                                  ifp->prefered_lft,
 883                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 884         tmp_plen = ifp->prefix_len;
 885         max_addresses = idev->cnf.max_addresses;
 886         tmp_cstamp = ifp->cstamp;
 887         tmp_tstamp = ifp->tstamp;
 888         spin_unlock_bh(&ifp->lock);
 889
 890         regen_advance = idev->cnf.regen_max_retry *
 891                         idev->cnf.dad_transmits *
 892                         idev->nd_parms->retrans_time / HZ;
 893         write_unlock(&idev->lock);
 894
 895         /* A temporary address is created only if this calculated Preferred
 896          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 897          * an implementation must not create a temporary address with a zero
 898          * Preferred Lifetime.
 899          */
 900         if (tmp_prefered_lft <= regen_advance) {
 901                 in6_ifa_put(ifp);
 902                 in6_dev_put(idev);
 903                 ret = -1;
 904                 goto out;
 905         }
 906
 907         addr_flags = IFA_F_TEMPORARY;
 908         /* set in addrconf_prefix_rcv() */
 909         if (ifp->flags & IFA_F_OPTIMISTIC)
 910                 addr_flags |= IFA_F_OPTIMISTIC;
 911
 912         ift = !max_addresses ||
 913               ipv6_count_addresses(idev) < max_addresses ?
 914                 ipv6_add_addr(idev, &addr, tmp_plen,
 915                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 916                               addr_flags) : NULL;
 917         if (!ift || IS_ERR(ift)) {
 918                 in6_ifa_put(ifp);
 919                 in6_dev_put(idev);
 920                 printk(KERN_INFO
 921                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 922                 tmpaddr = &addr;
 923                 write_lock(&idev->lock);
 924                 goto retry;
 925         }
 926
 927         spin_lock_bh(&ift->lock);
 928         ift->ifpub = ifp;
 929         ift->valid_lft = tmp_valid_lft;
 930         ift->prefered_lft = tmp_prefered_lft;
 931         ift->cstamp = tmp_cstamp;
 932         ift->tstamp = tmp_tstamp;
 933         spin_unlock_bh(&ift->lock);
 934
 935         addrconf_dad_start(ift, 0);
 936         in6_ifa_put(ift);
 937         in6_dev_put(idev);
 938 out:
 939         return ret;
 940 }
 941 #endif
 942
 943 /*
 944  *      Choose an appropriate source address (RFC3484)
 945  */
 946 enum {
 947         IPV6_SADDR_RULE_INIT = 0,
 948         IPV6_SADDR_RULE_LOCAL,
 949         IPV6_SADDR_RULE_SCOPE,
 950         IPV6_SADDR_RULE_PREFERRED,
 951 #ifdef CONFIG_IPV6_MIP6
 952         IPV6_SADDR_RULE_HOA,
 953 #endif
 954         IPV6_SADDR_RULE_OIF,
 955         IPV6_SADDR_RULE_LABEL,
 956 #ifdef CONFIG_IPV6_PRIVACY
 957         IPV6_SADDR_RULE_PRIVACY,
 958 #endif
 959         IPV6_SADDR_RULE_ORCHID,
 960         IPV6_SADDR_RULE_PREFIX,
 961         IPV6_SADDR_RULE_MAX
 962 };
 963
 964 struct ipv6_saddr_score {
 965         int                     rule;
 966         int                     addr_type;
 967         struct inet6_ifaddr     *ifa;
 968         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 969         int                     scopedist;
 970         int                     matchlen;
 971 };
 972
 973 struct ipv6_saddr_dst {
 974         const struct in6_addr *addr;
 975         int ifindex;
 976         int scope;
 977         int label;
 978         unsigned int prefs;
 979 };
 980
 981 static inline int ipv6_saddr_preferred(int type)
 982 {
 983         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 984                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 985                 return 1;
 986         return 0;
 987 }
 988
 989 static int ipv6_get_saddr_eval(struct net *net,
 990                                struct ipv6_saddr_score *score,
 991                                struct ipv6_saddr_dst *dst,
 992                                int i)
 993 {
 994         int ret;
 995
 996         if (i <= score->rule) {
 997                 switch (i) {
 998                 case IPV6_SADDR_RULE_SCOPE:
 999                         ret = score->scopedist;
1000                         break;
1001                 case IPV6_SADDR_RULE_PREFIX:
1002                         ret = score->matchlen;
1003                         break;
1004                 default:
1005                         ret = !!test_bit(i, score->scorebits);
1006                 }
1007                 goto out;
1008         }
1009
1010         switch (i) {
1011         case IPV6_SADDR_RULE_INIT:
1012                 /* Rule 0: remember if hiscore is not ready yet */
1013                 ret = !!score->ifa;
1014                 break;
1015         case IPV6_SADDR_RULE_LOCAL:
1016                 /* Rule 1: Prefer same address */
1017                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018                 break;
1019         case IPV6_SADDR_RULE_SCOPE:
1020                 /* Rule 2: Prefer appropriate scope
1021                  *
1022                  *      ret
1023                  *       ^
1024                  *    -1 |  d 15
1025                  *    ---+--+-+---> scope
1026                  *       |
1027                  *       |             d is scope of the destination.
1028                  *  B-d  |  \
1029                  *       |   \      <- smaller scope is better if
1030                  *  B-15 |    \        if scope is enough for destinaion.
1031                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1032                  * d-C-1 | /
1033                  *       |/         <- greater is better
1034                  *   -C  /             if scope is not enough for destination.
1035                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1036                  *
1037                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039                  * Assume B = 0 and we get C > 29.
1040                  */
1041                 ret = __ipv6_addr_src_scope(score->addr_type);
1042                 if (ret >= dst->scope)
1043                         ret = -ret;
1044                 else
1045                         ret -= 128;     /* 30 is enough */
1046                 score->scopedist = ret;
1047                 break;
1048         case IPV6_SADDR_RULE_PREFERRED:
1049                 /* Rule 3: Avoid deprecated and optimistic addresses */
1050                 ret = ipv6_saddr_preferred(score->addr_type) ||
1051                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052                 break;
1053 #ifdef CONFIG_IPV6_MIP6
1054         case IPV6_SADDR_RULE_HOA:
1055             {
1056                 /* Rule 4: Prefer home address */
1057                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1059                 break;
1060             }
1061 #endif
1062         case IPV6_SADDR_RULE_OIF:
1063                 /* Rule 5: Prefer outgoing interface */
1064                 ret = (!dst->ifindex ||
1065                        dst->ifindex == score->ifa->idev->dev->ifindex);
1066                 break;
1067         case IPV6_SADDR_RULE_LABEL:
1068                 /* Rule 6: Prefer matching label */
1069                 ret = ipv6_addr_label(net,
1070                                       &score->ifa->addr, score->addr_type,
1071                                       score->ifa->idev->dev->ifindex) == dst->label;
1072                 break;
1073 #ifdef CONFIG_IPV6_PRIVACY
1074         case IPV6_SADDR_RULE_PRIVACY:
1075             {
1076                 /* Rule 7: Prefer public address
1077                  * Note: prefer temprary address if use_tempaddr >= 2
1078                  */
1079                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1082                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1083                 break;
1084             }
1085 #endif
1086         case IPV6_SADDR_RULE_ORCHID:
1087                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088                  *          non-ORCHID vs non-ORCHID
1089                  */
1090                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091                         ipv6_addr_orchid(dst->addr));
1092                 break;
1093         case IPV6_SADDR_RULE_PREFIX:
1094                 /* Rule 8: Use longest matching prefix */
1095                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096                                                        dst->addr);
1097                 break;
1098         default:
1099                 ret = 0;
1100         }
1101
1102         if (ret)
1103                 __set_bit(i, score->scorebits);
1104         score->rule = i;
1105 out:
1106         return ret;
1107 }
1108
1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110                        const struct in6_addr *daddr, unsigned int prefs,
1111                        struct in6_addr *saddr)
1112 {
1113         struct ipv6_saddr_score scores[2],
1114                                 *score = &scores[0], *hiscore = &scores[1];
1115         struct ipv6_saddr_dst dst;
1116         struct net_device *dev;
1117         int dst_type;
1118
1119         dst_type = __ipv6_addr_type(daddr);
1120         dst.addr = daddr;
1121         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122         dst.scope = __ipv6_addr_src_scope(dst_type);
1123         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1124         dst.prefs = prefs;
1125
1126         hiscore->rule = -1;
1127         hiscore->ifa = NULL;
1128
1129         read_lock(&dev_base_lock);
1130         rcu_read_lock();
1131
1132         for_each_netdev(net, dev) {
1133                 struct inet6_dev *idev;
1134
1135                 /* Candidate Source Address (section 4)
1136                  *  - multicast and link-local destination address,
1137                  *    the set of candidate source address MUST only
1138                  *    include addresses assigned to interfaces
1139                  *    belonging to the same link as the outgoing
1140                  *    interface.
1141                  * (- For site-local destination addresses, the
1142                  *    set of candidate source addresses MUST only
1143                  *    include addresses assigned to interfaces
1144                  *    belonging to the same site as the outgoing
1145                  *    interface.)
1146                  */
1147                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1148                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1149                     dst.ifindex && dev->ifindex != dst.ifindex)
1150                         continue;
1151
1152                 idev = __in6_dev_get(dev);
1153                 if (!idev)
1154                         continue;
1155
1156                 read_lock_bh(&idev->lock);
1157                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1158                         int i;
1159
1160                         /*
1161                          * - Tentative Address (RFC2462 section 5.4)
1162                          *  - A tentative address is not considered
1163                          *    "assigned to an interface" in the traditional
1164                          *    sense, unless it is also flagged as optimistic.
1165                          * - Candidate Source Address (section 4)
1166                          *  - In any case, anycast addresses, multicast
1167                          *    addresses, and the unspecified address MUST
1168                          *    NOT be included in a candidate set.
1169                          */
1170                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1171                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1172                                 continue;
1173
1174                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1175
1176                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1177                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1178                                 LIMIT_NETDEBUG(KERN_DEBUG
1179                                                "ADDRCONF: unspecified / multicast address "
1180                                                "assigned as unicast address on %s",
1181                                                dev->name);
1182                                 continue;
1183                         }
1184
1185                         score->rule = -1;
1186                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1187
1188                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1189                                 int minihiscore, miniscore;
1190
1191                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1192                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1193
1194                                 if (minihiscore > miniscore) {
1195                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1196                                             score->scopedist > 0) {
1197                                                 /*
1198                                                  * special case:
1199                                                  * each remaining entry
1200                                                  * has too small (not enough)
1201                                                  * scope, because ifa entries
1202                                                  * are sorted by their scope
1203                                                  * values.
1204                                                  */
1205                                                 goto try_nextdev;
1206                                         }
1207                                         break;
1208                                 } else if (minihiscore < miniscore) {
1209                                         struct ipv6_saddr_score *tmp;
1210
1211                                         if (hiscore->ifa)
1212                                                 in6_ifa_put(hiscore->ifa);
1213
1214                                         in6_ifa_hold(score->ifa);
1215
1216                                         tmp = hiscore;
1217                                         hiscore = score;
1218                                         score = tmp;
1219
1220                                         /* restore our iterator */
1221                                         score->ifa = hiscore->ifa;
1222
1223                                         break;
1224                                 }
1225                         }
1226                 }
1227 try_nextdev:
1228                 read_unlock_bh(&idev->lock);
1229         }
1230         rcu_read_unlock();
1231         read_unlock(&dev_base_lock);
1232
1233         if (!hiscore->ifa)
1234                 return -EADDRNOTAVAIL;
1235
1236         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1237         in6_ifa_put(hiscore->ifa);
1238         return 0;
1239 }
1240
1241 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1242
1243 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1244                     unsigned char banned_flags)
1245 {
1246         struct inet6_dev *idev;
1247         int err = -EADDRNOTAVAIL;
1248
1249         rcu_read_lock();
1250         if ((idev = __in6_dev_get(dev)) != NULL) {
1251                 struct inet6_ifaddr *ifp;
1252
1253                 read_lock_bh(&idev->lock);
1254                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1255                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1256                                 ipv6_addr_copy(addr, &ifp->addr);
1257                                 err = 0;
1258                                 break;
1259                         }
1260                 }
1261                 read_unlock_bh(&idev->lock);
1262         }
1263         rcu_read_unlock();
1264         return err;
1265 }
1266
1267 static int ipv6_count_addresses(struct inet6_dev *idev)
1268 {
1269         int cnt = 0;
1270         struct inet6_ifaddr *ifp;
1271
1272         read_lock_bh(&idev->lock);
1273         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1274                 cnt++;
1275         read_unlock_bh(&idev->lock);
1276         return cnt;
1277 }
1278
1279 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1280                   struct net_device *dev, int strict)
1281 {
1282         struct inet6_ifaddr * ifp;
1283         u8 hash = ipv6_addr_hash(addr);
1284
1285         read_lock_bh(&addrconf_hash_lock);
1286         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1287                 if (!net_eq(dev_net(ifp->idev->dev), net))
1288                         continue;
1289                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1290                     !(ifp->flags&IFA_F_TENTATIVE)) {
1291                         if (dev == NULL || ifp->idev->dev == dev ||
1292                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1293                                 break;
1294                 }
1295         }
1296         read_unlock_bh(&addrconf_hash_lock);
1297         return ifp != NULL;
1298 }
1299 EXPORT_SYMBOL(ipv6_chk_addr);
1300
1301 static
1302 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1303                        struct net_device *dev)
1304 {
1305         struct inet6_ifaddr * ifp;
1306         u8 hash = ipv6_addr_hash(addr);
1307
1308         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1309                 if (!net_eq(dev_net(ifp->idev->dev), net))
1310                         continue;
1311                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1312                         if (dev == NULL || ifp->idev->dev == dev)
1313                                 break;
1314                 }
1315         }
1316         return ifp != NULL;
1317 }
1318
1319 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1320 {
1321         struct inet6_dev *idev;
1322         struct inet6_ifaddr *ifa;
1323         int     onlink;
1324
1325         onlink = 0;
1326         rcu_read_lock();
1327         idev = __in6_dev_get(dev);
1328         if (idev) {
1329                 read_lock_bh(&idev->lock);
1330                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1331                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1332                                                    ifa->prefix_len);
1333                         if (onlink)
1334                                 break;
1335                 }
1336                 read_unlock_bh(&idev->lock);
1337         }
1338         rcu_read_unlock();
1339         return onlink;
1340 }
1341
1342 EXPORT_SYMBOL(ipv6_chk_prefix);
1343
1344 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1345                                      struct net_device *dev, int strict)
1346 {
1347         struct inet6_ifaddr * ifp;
1348         u8 hash = ipv6_addr_hash(addr);
1349
1350         read_lock_bh(&addrconf_hash_lock);
1351         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1352                 if (!net_eq(dev_net(ifp->idev->dev), net))
1353                         continue;
1354                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1355                         if (dev == NULL || ifp->idev->dev == dev ||
1356                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1357                                 in6_ifa_hold(ifp);
1358                                 break;
1359                         }
1360                 }
1361         }
1362         read_unlock_bh(&addrconf_hash_lock);
1363
1364         return ifp;
1365 }
1366
1367 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1368 {
1369         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1370         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1371         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1372         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1373         int sk_ipv6only = ipv6_only_sock(sk);
1374         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1375         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1376         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1377
1378         if (!sk2_rcv_saddr && !sk_ipv6only)
1379                 return 1;
1380
1381         if (addr_type2 == IPV6_ADDR_ANY &&
1382             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1383                 return 1;
1384
1385         if (addr_type == IPV6_ADDR_ANY &&
1386             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1387                 return 1;
1388
1389         if (sk2_rcv_saddr6 &&
1390             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1391                 return 1;
1392
1393         if (addr_type == IPV6_ADDR_MAPPED &&
1394             !sk2_ipv6only &&
1395             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1396                 return 1;
1397
1398         return 0;
1399 }
1400
1401 /* Gets referenced address, destroys ifaddr */
1402
1403 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1404 {
1405         if (ifp->flags&IFA_F_PERMANENT) {
1406                 spin_lock_bh(&ifp->lock);
1407                 addrconf_del_timer(ifp);
1408                 ifp->flags |= IFA_F_TENTATIVE;
1409                 spin_unlock_bh(&ifp->lock);
1410                 in6_ifa_put(ifp);
1411 #ifdef CONFIG_IPV6_PRIVACY
1412         } else if (ifp->flags&IFA_F_TEMPORARY) {
1413                 struct inet6_ifaddr *ifpub;
1414                 spin_lock_bh(&ifp->lock);
1415                 ifpub = ifp->ifpub;
1416                 if (ifpub) {
1417                         in6_ifa_hold(ifpub);
1418                         spin_unlock_bh(&ifp->lock);
1419                         ipv6_create_tempaddr(ifpub, ifp);
1420                         in6_ifa_put(ifpub);
1421                 } else {
1422                         spin_unlock_bh(&ifp->lock);
1423                 }
1424                 ipv6_del_addr(ifp);
1425 #endif
1426         } else
1427                 ipv6_del_addr(ifp);
1428 }
1429
1430 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1431 {
1432         struct inet6_dev *idev = ifp->idev;
1433         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1434                 struct in6_addr addr;
1435
1436                 addr.s6_addr32[0] = htonl(0xfe800000);
1437                 addr.s6_addr32[1] = 0;
1438
1439                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1440                     ipv6_addr_equal(&ifp->addr, &addr)) {
1441                         /* DAD failed for link-local based on MAC address */
1442                         idev->cnf.disable_ipv6 = 1;
1443                 }
1444         }
1445
1446         if (net_ratelimit())
1447                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1448         addrconf_dad_stop(ifp);
1449 }
1450
1451 /* Join to solicited addr multicast group. */
1452
1453 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1454 {
1455         struct in6_addr maddr;
1456
1457         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1458                 return;
1459
1460         addrconf_addr_solict_mult(addr, &maddr);
1461         ipv6_dev_mc_inc(dev, &maddr);
1462 }
1463
1464 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1465 {
1466         struct in6_addr maddr;
1467
1468         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1469                 return;
1470
1471         addrconf_addr_solict_mult(addr, &maddr);
1472         __ipv6_dev_mc_dec(idev, &maddr);
1473 }
1474
1475 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1476 {
1477         struct in6_addr addr;
1478         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1479         if (ipv6_addr_any(&addr))
1480                 return;
1481         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1482 }
1483
1484 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1485 {
1486         struct in6_addr addr;
1487         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1488         if (ipv6_addr_any(&addr))
1489                 return;
1490         __ipv6_dev_ac_dec(ifp->idev, &addr);
1491 }
1492
1493 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1494 {
1495         if (dev->addr_len != ETH_ALEN)
1496                 return -1;
1497         memcpy(eui, dev->dev_addr, 3);
1498         memcpy(eui + 5, dev->dev_addr + 3, 3);
1499
1500         /*
1501          * The zSeries OSA network cards can be shared among various
1502          * OS instances, but the OSA cards have only one MAC address.
1503          * This leads to duplicate address conflicts in conjunction
1504          * with IPv6 if more than one instance uses the same card.
1505          *
1506          * The driver for these cards can deliver a unique 16-bit
1507          * identifier for each instance sharing the same card.  It is
1508          * placed instead of 0xFFFE in the interface identifier.  The
1509          * "u" bit of the interface identifier is not inverted in this
1510          * case.  Hence the resulting interface identifier has local
1511          * scope according to RFC2373.
1512          */
1513         if (dev->dev_id) {
1514                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1515                 eui[4] = dev->dev_id & 0xFF;
1516         } else {
1517                 eui[3] = 0xFF;
1518                 eui[4] = 0xFE;
1519                 eui[0] ^= 2;
1520         }
1521         return 0;
1522 }
1523
1524 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1525 {
1526         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1527         if (dev->addr_len != ARCNET_ALEN)
1528                 return -1;
1529         memset(eui, 0, 7);
1530         eui[7] = *(u8*)dev->dev_addr;
1531         return 0;
1532 }
1533
1534 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1535 {
1536         if (dev->addr_len != INFINIBAND_ALEN)
1537                 return -1;
1538         memcpy(eui, dev->dev_addr + 12, 8);
1539         eui[0] |= 2;
1540         return 0;
1541 }
1542
1543 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1544 {
1545         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1546                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1547                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1548                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1549                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1550                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1551         eui[1] = 0;
1552         eui[2] = 0x5E;
1553         eui[3] = 0xFE;
1554         memcpy(eui + 4, &addr, 4);
1555         return 0;
1556 }
1557 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1558
1559 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1560 {
1561         if (dev->priv_flags & IFF_ISATAP)
1562                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563         return -1;
1564 }
1565
1566 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1567 {
1568         switch (dev->type) {
1569         case ARPHRD_ETHER:
1570         case ARPHRD_FDDI:
1571         case ARPHRD_IEEE802_TR:
1572                 return addrconf_ifid_eui48(eui, dev);
1573         case ARPHRD_ARCNET:
1574                 return addrconf_ifid_arcnet(eui, dev);
1575         case ARPHRD_INFINIBAND:
1576                 return addrconf_ifid_infiniband(eui, dev);
1577         case ARPHRD_SIT:
1578                 return addrconf_ifid_sit(eui, dev);
1579         }
1580         return -1;
1581 }
1582
1583 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1584 {
1585         int err = -1;
1586         struct inet6_ifaddr *ifp;
1587
1588         read_lock_bh(&idev->lock);
1589         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1590                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1591                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1592                         err = 0;
1593                         break;
1594                 }
1595         }
1596         read_unlock_bh(&idev->lock);
1597         return err;
1598 }
1599
1600 #ifdef CONFIG_IPV6_PRIVACY
1601 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1602 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1603 {
1604 regen:
1605         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1606         idev->rndid[0] &= ~0x02;
1607
1608         /*
1609          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1610          * check if generated address is not inappropriate
1611          *
1612          *  - Reserved subnet anycast (RFC 2526)
1613          *      11111101 11....11 1xxxxxxx
1614          *  - ISATAP (RFC4214) 6.1
1615          *      00-00-5E-FE-xx-xx-xx-xx
1616          *  - value 0
1617          *  - XXX: already assigned to an address on the device
1618          */
1619         if (idev->rndid[0] == 0xfd &&
1620             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1621             (idev->rndid[7]&0x80))
1622                 goto regen;
1623         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1624                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1625                         goto regen;
1626                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1627                         goto regen;
1628         }
1629
1630         return 0;
1631 }
1632
1633 static void ipv6_regen_rndid(unsigned long data)
1634 {
1635         struct inet6_dev *idev = (struct inet6_dev *) data;
1636         unsigned long expires;
1637
1638         rcu_read_lock_bh();
1639         write_lock_bh(&idev->lock);
1640
1641         if (idev->dead)
1642                 goto out;
1643
1644         if (__ipv6_regen_rndid(idev) < 0)
1645                 goto out;
1646
1647         expires = jiffies +
1648                 idev->cnf.temp_prefered_lft * HZ -
1649                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1650         if (time_before(expires, jiffies)) {
1651                 printk(KERN_WARNING
1652                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1653                         idev->dev->name);
1654                 goto out;
1655         }
1656
1657         if (!mod_timer(&idev->regen_timer, expires))
1658                 in6_dev_hold(idev);
1659
1660 out:
1661         write_unlock_bh(&idev->lock);
1662         rcu_read_unlock_bh();
1663         in6_dev_put(idev);
1664 }
1665
1666 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1667         int ret = 0;
1668
1669         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1670                 ret = __ipv6_regen_rndid(idev);
1671         return ret;
1672 }
1673 #endif
1674
1675 /*
1676  *      Add prefix route.
1677  */
1678
1679 static void
1680 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1681                       unsigned long expires, u32 flags)
1682 {
1683         struct fib6_config cfg = {
1684                 .fc_table = RT6_TABLE_PREFIX,
1685                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1686                 .fc_ifindex = dev->ifindex,
1687                 .fc_expires = expires,
1688                 .fc_dst_len = plen,
1689                 .fc_flags = RTF_UP | flags,
1690                 .fc_nlinfo.nl_net = dev_net(dev),
1691                 .fc_protocol = RTPROT_KERNEL,
1692         };
1693
1694         ipv6_addr_copy(&cfg.fc_dst, pfx);
1695
1696         /* Prevent useless cloning on PtP SIT.
1697            This thing is done here expecting that the whole
1698            class of non-broadcast devices need not cloning.
1699          */
1700 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1701         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1702                 cfg.fc_flags |= RTF_NONEXTHOP;
1703 #endif
1704
1705         ip6_route_add(&cfg);
1706 }
1707
1708 /* Create "default" multicast route to the interface */
1709
1710 static void addrconf_add_mroute(struct net_device *dev)
1711 {
1712         struct fib6_config cfg = {
1713                 .fc_table = RT6_TABLE_LOCAL,
1714                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1715                 .fc_ifindex = dev->ifindex,
1716                 .fc_dst_len = 8,
1717                 .fc_flags = RTF_UP,
1718                 .fc_nlinfo.nl_net = dev_net(dev),
1719         };
1720
1721         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1722
1723         ip6_route_add(&cfg);
1724 }
1725
1726 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1727 static void sit_route_add(struct net_device *dev)
1728 {
1729         struct fib6_config cfg = {
1730                 .fc_table = RT6_TABLE_MAIN,
1731                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1732                 .fc_ifindex = dev->ifindex,
1733                 .fc_dst_len = 96,
1734                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1735                 .fc_nlinfo.nl_net = dev_net(dev),
1736         };
1737
1738         /* prefix length - 96 bits "::d.d.d.d" */
1739         ip6_route_add(&cfg);
1740 }
1741 #endif
1742
1743 static void addrconf_add_lroute(struct net_device *dev)
1744 {
1745         struct in6_addr addr;
1746
1747         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1748         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1749 }
1750
1751 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1752 {
1753         struct inet6_dev *idev;
1754
1755         ASSERT_RTNL();
1756
1757         if ((idev = ipv6_find_idev(dev)) == NULL)
1758                 return NULL;
1759
1760         /* Add default multicast route */
1761         addrconf_add_mroute(dev);
1762
1763         /* Add link local route */
1764         addrconf_add_lroute(dev);
1765         return idev;
1766 }
1767
1768 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1769 {
1770         struct prefix_info *pinfo;
1771         __u32 valid_lft;
1772         __u32 prefered_lft;
1773         int addr_type;
1774         struct inet6_dev *in6_dev;
1775
1776         pinfo = (struct prefix_info *) opt;
1777
1778         if (len < sizeof(struct prefix_info)) {
1779                 ADBG(("addrconf: prefix option too short\n"));
1780                 return;
1781         }
1782
1783         /*
1784          *      Validation checks ([ADDRCONF], page 19)
1785          */
1786
1787         addr_type = ipv6_addr_type(&pinfo->prefix);
1788
1789         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1790                 return;
1791
1792         valid_lft = ntohl(pinfo->valid);
1793         prefered_lft = ntohl(pinfo->prefered);
1794
1795         if (prefered_lft > valid_lft) {
1796                 if (net_ratelimit())
1797                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1798                 return;
1799         }
1800
1801         in6_dev = in6_dev_get(dev);
1802
1803         if (in6_dev == NULL) {
1804                 if (net_ratelimit())
1805                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1806                 return;
1807         }
1808
1809         /*
1810          *      Two things going on here:
1811          *      1) Add routes for on-link prefixes
1812          *      2) Configure prefixes with the auto flag set
1813          */
1814
1815         if (pinfo->onlink) {
1816                 struct rt6_info *rt;
1817                 unsigned long rt_expires;
1818
1819                 /* Avoid arithmetic overflow. Really, we could
1820                  * save rt_expires in seconds, likely valid_lft,
1821                  * but it would require division in fib gc, that it
1822                  * not good.
1823                  */
1824                 if (HZ > USER_HZ)
1825                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1826                 else
1827                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1828
1829                 if (addrconf_finite_timeout(rt_expires))
1830                         rt_expires *= HZ;
1831
1832                 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1833                                 dev->ifindex, 1);
1834
1835                 if (rt && addrconf_is_prefix_route(rt)) {
1836                         /* Autoconf prefix route */
1837                         if (valid_lft == 0) {
1838                                 ip6_del_rt(rt);
1839                                 rt = NULL;
1840                         } else if (addrconf_finite_timeout(rt_expires)) {
1841                                 /* not infinity */
1842                                 rt->rt6i_expires = jiffies + rt_expires;
1843                                 rt->rt6i_flags |= RTF_EXPIRES;
1844                         } else {
1845                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1846                                 rt->rt6i_expires = 0;
1847                         }
1848                 } else if (valid_lft) {
1849                         clock_t expires = 0;
1850                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1851                         if (addrconf_finite_timeout(rt_expires)) {
1852                                 /* not infinity */
1853                                 flags |= RTF_EXPIRES;
1854                                 expires = jiffies_to_clock_t(rt_expires);
1855                         }
1856                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1857                                               dev, expires, flags);
1858                 }
1859                 if (rt)
1860                         dst_release(&rt->u.dst);
1861         }
1862
1863         /* Try to figure out our local address for this prefix */
1864
1865         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1866                 struct inet6_ifaddr * ifp;
1867                 struct in6_addr addr;
1868                 int create = 0, update_lft = 0;
1869                 struct net *net = dev_net(dev);
1870
1871                 if (pinfo->prefix_len == 64) {
1872                         memcpy(&addr, &pinfo->prefix, 8);
1873                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1874                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1875                                 in6_dev_put(in6_dev);
1876                                 return;
1877                         }
1878                         goto ok;
1879                 }
1880                 if (net_ratelimit())
1881                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1882                                pinfo->prefix_len);
1883                 in6_dev_put(in6_dev);
1884                 return;
1885
1886 ok:
1887
1888                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1889
1890                 if (ifp == NULL && valid_lft) {
1891                         int max_addresses = in6_dev->cnf.max_addresses;
1892                         u32 addr_flags = 0;
1893
1894 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1895                         if (in6_dev->cnf.optimistic_dad &&
1896                             !net->ipv6.devconf_all->forwarding)
1897                                 addr_flags = IFA_F_OPTIMISTIC;
1898 #endif
1899
1900                         /* Do not allow to create too much of autoconfigured
1901                          * addresses; this would be too easy way to crash kernel.
1902                          */
1903                         if (!max_addresses ||
1904                             ipv6_count_addresses(in6_dev) < max_addresses)
1905                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1906                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1907                                                     addr_flags);
1908
1909                         if (!ifp || IS_ERR(ifp)) {
1910                                 in6_dev_put(in6_dev);
1911                                 return;
1912                         }
1913
1914                         update_lft = create = 1;
1915                         ifp->cstamp = jiffies;
1916                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1917                 }
1918
1919                 if (ifp) {
1920                         int flags;
1921                         unsigned long now;
1922 #ifdef CONFIG_IPV6_PRIVACY
1923                         struct inet6_ifaddr *ift;
1924 #endif
1925                         u32 stored_lft;
1926
1927                         /* update lifetime (RFC2462 5.5.3 e) */
1928                         spin_lock(&ifp->lock);
1929                         now = jiffies;
1930                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1931                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1932                         else
1933                                 stored_lft = 0;
1934                         if (!update_lft && stored_lft) {
1935                                 if (valid_lft > MIN_VALID_LIFETIME ||
1936                                     valid_lft > stored_lft)
1937                                         update_lft = 1;
1938                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1939                                         /* valid_lft <= stored_lft is always true */
1940                                         /* XXX: IPsec */
1941                                         update_lft = 0;
1942                                 } else {
1943                                         valid_lft = MIN_VALID_LIFETIME;
1944                                         if (valid_lft < prefered_lft)
1945                                                 prefered_lft = valid_lft;
1946                                         update_lft = 1;
1947                                 }
1948                         }
1949
1950                         if (update_lft) {
1951                                 ifp->valid_lft = valid_lft;
1952                                 ifp->prefered_lft = prefered_lft;
1953                                 ifp->tstamp = now;
1954                                 flags = ifp->flags;
1955                                 ifp->flags &= ~IFA_F_DEPRECATED;
1956                                 spin_unlock(&ifp->lock);
1957
1958                                 if (!(flags&IFA_F_TENTATIVE))
1959                                         ipv6_ifa_notify(0, ifp);
1960                         } else
1961                                 spin_unlock(&ifp->lock);
1962
1963 #ifdef CONFIG_IPV6_PRIVACY
1964                         read_lock_bh(&in6_dev->lock);
1965                         /* update all temporary addresses in the list */
1966                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1967                                 /*
1968                                  * When adjusting the lifetimes of an existing
1969                                  * temporary address, only lower the lifetimes.
1970                                  * Implementations must not increase the
1971                                  * lifetimes of an existing temporary address
1972                                  * when processing a Prefix Information Option.
1973                                  */
1974                                 if (ifp != ift->ifpub)
1975                                         continue;
1976
1977                                 spin_lock(&ift->lock);
1978                                 flags = ift->flags;
1979                                 if (ift->valid_lft > valid_lft &&
1980                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1981                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1982                                 if (ift->prefered_lft > prefered_lft &&
1983                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1984                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1985                                 spin_unlock(&ift->lock);
1986                                 if (!(flags&IFA_F_TENTATIVE))
1987                                         ipv6_ifa_notify(0, ift);
1988                         }
1989
1990                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1991                                 /*
1992                                  * When a new public address is created as described in [ADDRCONF],
1993                                  * also create a new temporary address.
1994                                  */
1995                                 read_unlock_bh(&in6_dev->lock);
1996                                 ipv6_create_tempaddr(ifp, NULL);
1997                         } else {
1998                                 read_unlock_bh(&in6_dev->lock);
1999                         }
2000 #endif
2001                         in6_ifa_put(ifp);
2002                         addrconf_verify(0);
2003                 }
2004         }
2005         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2006         in6_dev_put(in6_dev);
2007 }
2008
2009 /*
2010  *      Set destination address.
2011  *      Special case for SIT interfaces where we create a new "virtual"
2012  *      device.
2013  */
2014 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2015 {
2016         struct in6_ifreq ireq;
2017         struct net_device *dev;
2018         int err = -EINVAL;
2019
2020         rtnl_lock();
2021
2022         err = -EFAULT;
2023         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2024                 goto err_exit;
2025
2026         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2027
2028         err = -ENODEV;
2029         if (dev == NULL)
2030                 goto err_exit;
2031
2032 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2033         if (dev->type == ARPHRD_SIT) {
2034                 struct ifreq ifr;
2035                 mm_segment_t    oldfs;
2036                 struct ip_tunnel_parm p;
2037
2038                 err = -EADDRNOTAVAIL;
2039                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2040                         goto err_exit;
2041
2042                 memset(&p, 0, sizeof(p));
2043                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2044                 p.iph.saddr = 0;
2045                 p.iph.version = 4;
2046                 p.iph.ihl = 5;
2047                 p.iph.protocol = IPPROTO_IPV6;
2048                 p.iph.ttl = 64;
2049                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2050
2051                 oldfs = get_fs(); set_fs(KERNEL_DS);
2052                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2053                 set_fs(oldfs);
2054
2055                 if (err == 0) {
2056                         err = -ENOBUFS;
2057                         dev = __dev_get_by_name(net, p.name);
2058                         if (!dev)
2059                                 goto err_exit;
2060                         err = dev_open(dev);
2061                 }
2062         }
2063 #endif
2064
2065 err_exit:
2066         rtnl_unlock();
2067         return err;
2068 }
2069
2070 /*
2071  *      Manual configuration of address on an interface
2072  */
2073 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2074                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2075                           __u32 valid_lft)
2076 {
2077         struct inet6_ifaddr *ifp;
2078         struct inet6_dev *idev;
2079         struct net_device *dev;
2080         int scope;
2081         u32 flags;
2082         clock_t expires;
2083         unsigned long timeout;
2084
2085         ASSERT_RTNL();
2086
2087         if (plen > 128)
2088                 return -EINVAL;
2089
2090         /* check the lifetime */
2091         if (!valid_lft || prefered_lft > valid_lft)
2092                 return -EINVAL;
2093
2094         dev = __dev_get_by_index(net, ifindex);
2095         if (!dev)
2096                 return -ENODEV;
2097
2098         if ((idev = addrconf_add_dev(dev)) == NULL)
2099                 return -ENOBUFS;
2100
2101         scope = ipv6_addr_scope(pfx);
2102
2103         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2104         if (addrconf_finite_timeout(timeout)) {
2105                 expires = jiffies_to_clock_t(timeout * HZ);
2106                 valid_lft = timeout;
2107                 flags = RTF_EXPIRES;
2108         } else {
2109                 expires = 0;
2110                 flags = 0;
2111                 ifa_flags |= IFA_F_PERMANENT;
2112         }
2113
2114         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2115         if (addrconf_finite_timeout(timeout)) {
2116                 if (timeout == 0)
2117                         ifa_flags |= IFA_F_DEPRECATED;
2118                 prefered_lft = timeout;
2119         }
2120
2121         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2122
2123         if (!IS_ERR(ifp)) {
2124                 spin_lock_bh(&ifp->lock);
2125                 ifp->valid_lft = valid_lft;
2126                 ifp->prefered_lft = prefered_lft;
2127                 ifp->tstamp = jiffies;
2128                 spin_unlock_bh(&ifp->lock);
2129
2130                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2131                                       expires, flags);
2132                 /*
2133                  * Note that section 3.1 of RFC 4429 indicates
2134                  * that the Optimistic flag should not be set for
2135                  * manually configured addresses
2136                  */
2137                 addrconf_dad_start(ifp, 0);
2138                 in6_ifa_put(ifp);
2139                 addrconf_verify(0);
2140                 return 0;
2141         }
2142
2143         return PTR_ERR(ifp);
2144 }
2145
2146 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2147                           unsigned int plen)
2148 {
2149         struct inet6_ifaddr *ifp;
2150         struct inet6_dev *idev;
2151         struct net_device *dev;
2152
2153         if (plen > 128)
2154                 return -EINVAL;
2155
2156         dev = __dev_get_by_index(net, ifindex);
2157         if (!dev)
2158                 return -ENODEV;
2159
2160         if ((idev = __in6_dev_get(dev)) == NULL)
2161                 return -ENXIO;
2162
2163         read_lock_bh(&idev->lock);
2164         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2165                 if (ifp->prefix_len == plen &&
2166                     ipv6_addr_equal(pfx, &ifp->addr)) {
2167                         in6_ifa_hold(ifp);
2168                         read_unlock_bh(&idev->lock);
2169
2170                         ipv6_del_addr(ifp);
2171
2172                         /* If the last address is deleted administratively,
2173                            disable IPv6 on this interface.
2174                          */
2175                         if (idev->addr_list == NULL)
2176                                 addrconf_ifdown(idev->dev, 1);
2177                         return 0;
2178                 }
2179         }
2180         read_unlock_bh(&idev->lock);
2181         return -EADDRNOTAVAIL;
2182 }
2183
2184
2185 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2186 {
2187         struct in6_ifreq ireq;
2188         int err;
2189
2190         if (!capable(CAP_NET_ADMIN))
2191                 return -EPERM;
2192
2193         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2194                 return -EFAULT;
2195
2196         rtnl_lock();
2197         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2198                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2199                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2200         rtnl_unlock();
2201         return err;
2202 }
2203
2204 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2205 {
2206         struct in6_ifreq ireq;
2207         int err;
2208
2209         if (!capable(CAP_NET_ADMIN))
2210                 return -EPERM;
2211
2212         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2213                 return -EFAULT;
2214
2215         rtnl_lock();
2216         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2217                              ireq.ifr6_prefixlen);
2218         rtnl_unlock();
2219         return err;
2220 }
2221
2222 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2223 static void sit_add_v4_addrs(struct inet6_dev *idev)
2224 {
2225         struct inet6_ifaddr * ifp;
2226         struct in6_addr addr;
2227         struct net_device *dev;
2228         struct net *net = dev_net(idev->dev);
2229         int scope;
2230
2231         ASSERT_RTNL();
2232
2233         memset(&addr, 0, sizeof(struct in6_addr));
2234         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2235
2236         if (idev->dev->flags&IFF_POINTOPOINT) {
2237                 addr.s6_addr32[0] = htonl(0xfe800000);
2238                 scope = IFA_LINK;
2239         } else {
2240                 scope = IPV6_ADDR_COMPATv4;
2241         }
2242
2243         if (addr.s6_addr32[3]) {
2244                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2245                 if (!IS_ERR(ifp)) {
2246                         spin_lock_bh(&ifp->lock);
2247                         ifp->flags &= ~IFA_F_TENTATIVE;
2248                         spin_unlock_bh(&ifp->lock);
2249                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2250                         in6_ifa_put(ifp);
2251                 }
2252                 return;
2253         }
2254
2255         for_each_netdev(net, dev) {
2256                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2257                 if (in_dev && (dev->flags & IFF_UP)) {
2258                         struct in_ifaddr * ifa;
2259
2260                         int flag = scope;
2261
2262                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2263                                 int plen;
2264
2265                                 addr.s6_addr32[3] = ifa->ifa_local;
2266
2267                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2268                                         continue;
2269                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2270                                         if (idev->dev->flags&IFF_POINTOPOINT)
2271                                                 continue;
2272                                         flag |= IFA_HOST;
2273                                 }
2274                                 if (idev->dev->flags&IFF_POINTOPOINT)
2275                                         plen = 64;
2276                                 else
2277                                         plen = 96;
2278
2279                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2280                                                     IFA_F_PERMANENT);
2281                                 if (!IS_ERR(ifp)) {
2282                                         spin_lock_bh(&ifp->lock);
2283                                         ifp->flags &= ~IFA_F_TENTATIVE;
2284                                         spin_unlock_bh(&ifp->lock);
2285                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2286                                         in6_ifa_put(ifp);
2287                                 }
2288                         }
2289                 }
2290         }
2291 }
2292 #endif
2293
2294 static void init_loopback(struct net_device *dev)
2295 {
2296         struct inet6_dev  *idev;
2297         struct inet6_ifaddr * ifp;
2298
2299         /* ::1 */
2300
2301         ASSERT_RTNL();
2302
2303         if ((idev = ipv6_find_idev(dev)) == NULL) {
2304                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2305                 return;
2306         }
2307
2308         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2309         if (!IS_ERR(ifp)) {
2310                 spin_lock_bh(&ifp->lock);
2311                 ifp->flags &= ~IFA_F_TENTATIVE;
2312                 spin_unlock_bh(&ifp->lock);
2313                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2314                 in6_ifa_put(ifp);
2315         }
2316 }
2317
2318 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2319 {
2320         struct inet6_ifaddr * ifp;
2321         u32 addr_flags = IFA_F_PERMANENT;
2322
2323 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2324         if (idev->cnf.optimistic_dad &&
2325             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2326                 addr_flags |= IFA_F_OPTIMISTIC;
2327 #endif
2328
2329
2330         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2331         if (!IS_ERR(ifp)) {
2332                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2333                 addrconf_dad_start(ifp, 0);
2334                 in6_ifa_put(ifp);
2335         }
2336 }
2337
2338 static void addrconf_dev_config(struct net_device *dev)
2339 {
2340         struct in6_addr addr;
2341         struct inet6_dev    * idev;
2342
2343         ASSERT_RTNL();
2344
2345         if ((dev->type != ARPHRD_ETHER) &&
2346             (dev->type != ARPHRD_FDDI) &&
2347             (dev->type != ARPHRD_IEEE802_TR) &&
2348             (dev->type != ARPHRD_ARCNET) &&
2349             (dev->type != ARPHRD_INFINIBAND)) {
2350                 /* Alas, we support only Ethernet autoconfiguration. */
2351                 return;
2352         }
2353
2354         idev = addrconf_add_dev(dev);
2355         if (idev == NULL)
2356                 return;
2357
2358         memset(&addr, 0, sizeof(struct in6_addr));
2359         addr.s6_addr32[0] = htonl(0xFE800000);
2360
2361         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2362                 addrconf_add_linklocal(idev, &addr);
2363 }
2364
2365 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2366 static void addrconf_sit_config(struct net_device *dev)
2367 {
2368         struct inet6_dev *idev;
2369
2370         ASSERT_RTNL();
2371
2372         /*
2373          * Configure the tunnel with one of our IPv4
2374          * addresses... we should configure all of
2375          * our v4 addrs in the tunnel
2376          */
2377
2378         if ((idev = ipv6_find_idev(dev)) == NULL) {
2379                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2380                 return;
2381         }
2382
2383         if (dev->priv_flags & IFF_ISATAP) {
2384                 struct in6_addr addr;
2385
2386                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2387                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2388                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2389                         addrconf_add_linklocal(idev, &addr);
2390                 return;
2391         }
2392
2393         sit_add_v4_addrs(idev);
2394
2395         if (dev->flags&IFF_POINTOPOINT) {
2396                 addrconf_add_mroute(dev);
2397                 addrconf_add_lroute(dev);
2398         } else
2399                 sit_route_add(dev);
2400 }
2401 #endif
2402
2403 static inline int
2404 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2405 {
2406         struct in6_addr lladdr;
2407
2408         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2409                 addrconf_add_linklocal(idev, &lladdr);
2410                 return 0;
2411         }
2412         return -1;
2413 }
2414
2415 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2416 {
2417         struct net_device *link_dev;
2418         struct net *net = dev_net(idev->dev);
2419
2420         /* first try to inherit the link-local address from the link device */
2421         if (idev->dev->iflink &&
2422             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2423                 if (!ipv6_inherit_linklocal(idev, link_dev))
2424                         return;
2425         }
2426         /* then try to inherit it from any device */
2427         for_each_netdev(net, link_dev) {
2428                 if (!ipv6_inherit_linklocal(idev, link_dev))
2429                         return;
2430         }
2431         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2432 }
2433
2434 /*
2435  * Autoconfigure tunnel with a link-local address so routing protocols,
2436  * DHCPv6, MLD etc. can be run over the virtual link
2437  */
2438
2439 static void addrconf_ip6_tnl_config(struct net_device *dev)
2440 {
2441         struct inet6_dev *idev;
2442
2443         ASSERT_RTNL();
2444
2445         if ((idev = addrconf_add_dev(dev)) == NULL) {
2446                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2447                 return;
2448         }
2449         ip6_tnl_add_linklocal(idev);
2450 }
2451
2452 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2453                            void * data)
2454 {
2455         struct net_device *dev = (struct net_device *) data;
2456         struct inet6_dev *idev = __in6_dev_get(dev);
2457         int run_pending = 0;
2458         int err;
2459
2460         switch(event) {
2461         case NETDEV_REGISTER:
2462                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2463                         idev = ipv6_add_dev(dev);
2464                         if (!idev)
2465                                 return notifier_from_errno(-ENOMEM);
2466                 }
2467                 break;
2468         case NETDEV_UP:
2469         case NETDEV_CHANGE:
2470                 if (dev->flags & IFF_SLAVE)
2471                         break;
2472
2473                 if (event == NETDEV_UP) {
2474                         if (!addrconf_qdisc_ok(dev)) {
2475                                 /* device is not ready yet. */
2476                                 printk(KERN_INFO
2477                                         "ADDRCONF(NETDEV_UP): %s: "
2478                                         "link is not ready\n",
2479                                         dev->name);
2480                                 break;
2481                         }
2482
2483                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2484                                 idev = ipv6_add_dev(dev);
2485
2486                         if (idev) {
2487                                 idev->if_flags |= IF_READY;
2488                                 run_pending = 1;
2489                         }
2490                 } else {
2491                         if (!addrconf_qdisc_ok(dev)) {
2492                                 /* device is still not ready. */
2493                                 break;
2494                         }
2495
2496                         if (idev) {
2497                                 if (idev->if_flags & IF_READY) {
2498                                         /* device is already configured. */
2499                                         break;
2500                                 }
2501                                 idev->if_flags |= IF_READY;
2502                         }
2503
2504                         printk(KERN_INFO
2505                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2506                                         "link becomes ready\n",
2507                                         dev->name);
2508
2509                         run_pending = 1;
2510                 }
2511
2512                 switch(dev->type) {
2513 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2514                 case ARPHRD_SIT:
2515                         addrconf_sit_config(dev);
2516                         break;
2517 #endif
2518                 case ARPHRD_TUNNEL6:
2519                         addrconf_ip6_tnl_config(dev);
2520                         break;
2521                 case ARPHRD_LOOPBACK:
2522                         init_loopback(dev);
2523                         break;
2524
2525                 default:
2526                         addrconf_dev_config(dev);
2527                         break;
2528                 }
2529                 if (idev) {
2530                         if (run_pending)
2531                                 addrconf_dad_run(idev);
2532
2533                         /* If the MTU changed during the interface down, when the
2534                            interface up, the changed MTU must be reflected in the
2535                            idev as well as routers.
2536                          */
2537                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2538                                 rt6_mtu_change(dev, dev->mtu);
2539                                 idev->cnf.mtu6 = dev->mtu;
2540                         }
2541                         idev->tstamp = jiffies;
2542                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2543                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2544                            stop IPv6 on this interface.
2545                          */
2546                         if (dev->mtu < IPV6_MIN_MTU)
2547                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2548                 }
2549                 break;
2550
2551         case NETDEV_CHANGEMTU:
2552                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2553                         rt6_mtu_change(dev, dev->mtu);
2554                         idev->cnf.mtu6 = dev->mtu;
2555                         break;
2556                 }
2557
2558                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2559                         idev = ipv6_add_dev(dev);
2560                         if (idev)
2561                                 break;
2562                 }
2563
2564                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2565
2566         case NETDEV_DOWN:
2567         case NETDEV_UNREGISTER:
2568                 /*
2569                  *      Remove all addresses from this interface.
2570                  */
2571                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2572                 break;
2573
2574         case NETDEV_CHANGENAME:
2575                 if (idev) {
2576                         snmp6_unregister_dev(idev);
2577                         addrconf_sysctl_unregister(idev);
2578                         addrconf_sysctl_register(idev);
2579                         err = snmp6_register_dev(idev);
2580                         if (err)
2581                                 return notifier_from_errno(err);
2582                 }
2583                 break;
2584         }
2585
2586         return NOTIFY_OK;
2587 }
2588
2589 /*
2590  *      addrconf module should be notified of a device going up
2591  */
2592 static struct notifier_block ipv6_dev_notf = {
2593         .notifier_call = addrconf_notify,
2594         .priority = 0
2595 };
2596
2597 static int addrconf_ifdown(struct net_device *dev, int how)
2598 {
2599         struct inet6_dev *idev;
2600         struct inet6_ifaddr *ifa, **bifa;
2601         struct net *net = dev_net(dev);
2602         int i;
2603
2604         ASSERT_RTNL();
2605
2606         if ((dev->flags & IFF_LOOPBACK) && how == 1)
2607                 how = 0;
2608
2609         rt6_ifdown(net, dev);
2610         neigh_ifdown(&nd_tbl, dev);
2611
2612         idev = __in6_dev_get(dev);
2613         if (idev == NULL)
2614                 return -ENODEV;
2615
2616         /* Step 1: remove reference to ipv6 device from parent device.
2617                    Do not dev_put!
2618          */
2619         if (how) {
2620                 idev->dead = 1;
2621
2622                 /* protected by rtnl_lock */
2623                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2624
2625                 /* Step 1.5: remove snmp6 entry */
2626                 snmp6_unregister_dev(idev);
2627
2628         }
2629
2630         /* Step 2: clear hash table */
2631         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2632                 bifa = &inet6_addr_lst[i];
2633
2634                 write_lock_bh(&addrconf_hash_lock);
2635                 while ((ifa = *bifa) != NULL) {
2636                         if (ifa->idev == idev) {
2637                                 *bifa = ifa->lst_next;
2638                                 ifa->lst_next = NULL;
2639                                 addrconf_del_timer(ifa);
2640                                 in6_ifa_put(ifa);
2641                                 continue;
2642                         }
2643                         bifa = &ifa->lst_next;
2644                 }
2645                 write_unlock_bh(&addrconf_hash_lock);
2646         }
2647
2648         write_lock_bh(&idev->lock);
2649
2650         /* Step 3: clear flags for stateless addrconf */
2651         if (!how)
2652                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2653
2654         /* Step 4: clear address list */
2655 #ifdef CONFIG_IPV6_PRIVACY
2656         if (how && del_timer(&idev->regen_timer))
2657                 in6_dev_put(idev);
2658
2659         /* clear tempaddr list */
2660         while ((ifa = idev->tempaddr_list) != NULL) {
2661                 idev->tempaddr_list = ifa->tmp_next;
2662                 ifa->tmp_next = NULL;
2663                 ifa->dead = 1;
2664                 write_unlock_bh(&idev->lock);
2665                 spin_lock_bh(&ifa->lock);
2666
2667                 if (ifa->ifpub) {
2668                         in6_ifa_put(ifa->ifpub);
2669                         ifa->ifpub = NULL;
2670                 }
2671                 spin_unlock_bh(&ifa->lock);
2672                 in6_ifa_put(ifa);
2673                 write_lock_bh(&idev->lock);
2674         }
2675 #endif
2676         while ((ifa = idev->addr_list) != NULL) {
2677                 idev->addr_list = ifa->if_next;
2678                 ifa->if_next = NULL;
2679                 ifa->dead = 1;
2680                 addrconf_del_timer(ifa);
2681                 write_unlock_bh(&idev->lock);
2682
2683                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2684                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2685                 in6_ifa_put(ifa);
2686
2687                 write_lock_bh(&idev->lock);
2688         }
2689         write_unlock_bh(&idev->lock);
2690
2691         /* Step 5: Discard multicast list */
2692
2693         if (how)
2694                 ipv6_mc_destroy_dev(idev);
2695         else
2696                 ipv6_mc_down(idev);
2697
2698         idev->tstamp = jiffies;
2699
2700         /* Shot the device (if unregistered) */
2701
2702         if (how) {
2703                 addrconf_sysctl_unregister(idev);
2704                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2705                 neigh_ifdown(&nd_tbl, dev);
2706                 in6_dev_put(idev);
2707         }
2708         return 0;
2709 }
2710
2711 static void addrconf_rs_timer(unsigned long data)
2712 {
2713         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2714
2715         if (ifp->idev->cnf.forwarding)
2716                 goto out;
2717
2718         if (ifp->idev->if_flags & IF_RA_RCVD) {
2719                 /*
2720                  *      Announcement received after solicitation
2721                  *      was sent
2722                  */
2723                 goto out;
2724         }
2725
2726         spin_lock(&ifp->lock);
2727         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2728                 /* The wait after the last probe can be shorter */
2729                 addrconf_mod_timer(ifp, AC_RS,
2730                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2731                                    ifp->idev->cnf.rtr_solicit_delay :
2732                                    ifp->idev->cnf.rtr_solicit_interval);
2733                 spin_unlock(&ifp->lock);
2734
2735                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2736         } else {
2737                 spin_unlock(&ifp->lock);
2738                 /*
2739                  * Note: we do not support deprecated "all on-link"
2740                  * assumption any longer.
2741                  */
2742                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2743                        ifp->idev->dev->name);
2744         }
2745
2746 out:
2747         in6_ifa_put(ifp);
2748 }
2749
2750 /*
2751  *      Duplicate Address Detection
2752  */
2753 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2754 {
2755         unsigned long rand_num;
2756         struct inet6_dev *idev = ifp->idev;
2757
2758         if (ifp->flags & IFA_F_OPTIMISTIC)
2759                 rand_num = 0;
2760         else
2761                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2762
2763         ifp->probes = idev->cnf.dad_transmits;
2764         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2765 }
2766
2767 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2768 {
2769         struct inet6_dev *idev = ifp->idev;
2770         struct net_device *dev = idev->dev;
2771
2772         addrconf_join_solict(dev, &ifp->addr);
2773
2774         net_srandom(ifp->addr.s6_addr32[3]);
2775
2776         read_lock_bh(&idev->lock);
2777         if (ifp->dead)
2778                 goto out;
2779         spin_lock_bh(&ifp->lock);
2780
2781         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2782             idev->cnf.accept_dad < 1 ||
2783             !(ifp->flags&IFA_F_TENTATIVE) ||
2784             ifp->flags & IFA_F_NODAD) {
2785                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2786                 spin_unlock_bh(&ifp->lock);
2787                 read_unlock_bh(&idev->lock);
2788
2789                 addrconf_dad_completed(ifp);
2790                 return;
2791         }
2792
2793         if (!(idev->if_flags & IF_READY)) {
2794                 spin_unlock_bh(&ifp->lock);
2795                 read_unlock_bh(&idev->lock);
2796                 /*
2797                  * If the defice is not ready:
2798                  * - keep it tentative if it is a permanent address.
2799                  * - otherwise, kill it.
2800                  */
2801                 in6_ifa_hold(ifp);
2802                 addrconf_dad_stop(ifp);
2803                 return;
2804         }
2805
2806         /*
2807          * Optimistic nodes can start receiving
2808          * Frames right away
2809          */
2810         if(ifp->flags & IFA_F_OPTIMISTIC)
2811                 ip6_ins_rt(ifp->rt);
2812
2813         addrconf_dad_kick(ifp);
2814         spin_unlock_bh(&ifp->lock);
2815 out:
2816         read_unlock_bh(&idev->lock);
2817 }
2818
2819 static void addrconf_dad_timer(unsigned long data)
2820 {
2821         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2822         struct inet6_dev *idev = ifp->idev;
2823         struct in6_addr mcaddr;
2824
2825         read_lock_bh(&idev->lock);
2826         if (idev->dead) {
2827                 read_unlock_bh(&idev->lock);
2828                 goto out;
2829         }
2830         if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) {
2831                 read_unlock_bh(&idev->lock);
2832                 addrconf_dad_failure(ifp);
2833                 return;
2834         }
2835         spin_lock_bh(&ifp->lock);
2836         if (ifp->probes == 0) {
2837                 /*
2838                  * DAD was successful
2839                  */
2840
2841                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2842                 spin_unlock_bh(&ifp->lock);
2843                 read_unlock_bh(&idev->lock);
2844
2845                 addrconf_dad_completed(ifp);
2846
2847                 goto out;
2848         }
2849
2850         ifp->probes--;
2851         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2852         spin_unlock_bh(&ifp->lock);
2853         read_unlock_bh(&idev->lock);
2854
2855         /* send a neighbour solicitation for our addr */
2856         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2857         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2858 out:
2859         in6_ifa_put(ifp);
2860 }
2861
2862 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2863 {
2864         struct net_device *     dev = ifp->idev->dev;
2865
2866         /*
2867          *      Configure the address for reception. Now it is valid.
2868          */
2869
2870         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2871
2872         /* If added prefix is link local and forwarding is off,
2873            start sending router solicitations.
2874          */
2875
2876         if (ifp->idev->cnf.forwarding == 0 &&
2877             ifp->idev->cnf.rtr_solicits > 0 &&
2878             (dev->flags&IFF_LOOPBACK) == 0 &&
2879             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2880                 /*
2881                  *      If a host as already performed a random delay
2882                  *      [...] as part of DAD [...] there is no need
2883                  *      to delay again before sending the first RS
2884                  */
2885                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2886
2887                 spin_lock_bh(&ifp->lock);
2888                 ifp->probes = 1;
2889                 ifp->idev->if_flags |= IF_RS_SENT;
2890                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2891                 spin_unlock_bh(&ifp->lock);
2892         }
2893 }
2894
2895 static void addrconf_dad_run(struct inet6_dev *idev) {
2896         struct inet6_ifaddr *ifp;
2897
2898         read_lock_bh(&idev->lock);
2899         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2900                 spin_lock_bh(&ifp->lock);
2901                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2902                         spin_unlock_bh(&ifp->lock);
2903                         continue;
2904                 }
2905                 spin_unlock_bh(&ifp->lock);
2906                 addrconf_dad_kick(ifp);
2907         }
2908         read_unlock_bh(&idev->lock);
2909 }
2910
2911 #ifdef CONFIG_PROC_FS
2912 struct if6_iter_state {
2913         struct seq_net_private p;
2914         int bucket;
2915 };
2916
2917 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2918 {
2919         struct inet6_ifaddr *ifa = NULL;
2920         struct if6_iter_state *state = seq->private;
2921         struct net *net = seq_file_net(seq);
2922
2923         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2924                 ifa = inet6_addr_lst[state->bucket];
2925
2926                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2927                         ifa = ifa->lst_next;
2928                 if (ifa)
2929                         break;
2930         }
2931         return ifa;
2932 }
2933
2934 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2935 {
2936         struct if6_iter_state *state = seq->private;
2937         struct net *net = seq_file_net(seq);
2938
2939         ifa = ifa->lst_next;
2940 try_again:
2941         if (ifa) {
2942                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2943                         ifa = ifa->lst_next;
2944                         goto try_again;
2945                 }
2946         }
2947
2948         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2949                 ifa = inet6_addr_lst[state->bucket];
2950                 goto try_again;
2951         }
2952
2953         return ifa;
2954 }
2955
2956 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2957 {
2958         struct inet6_ifaddr *ifa = if6_get_first(seq);
2959
2960         if (ifa)
2961                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2962                         --pos;
2963         return pos ? NULL : ifa;
2964 }
2965
2966 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2967         __acquires(addrconf_hash_lock)
2968 {
2969         read_lock_bh(&addrconf_hash_lock);
2970         return if6_get_idx(seq, *pos);
2971 }
2972
2973 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2974 {
2975         struct inet6_ifaddr *ifa;
2976
2977         ifa = if6_get_next(seq, v);
2978         ++*pos;
2979         return ifa;
2980 }
2981
2982 static void if6_seq_stop(struct seq_file *seq, void *v)
2983         __releases(addrconf_hash_lock)
2984 {
2985         read_unlock_bh(&addrconf_hash_lock);
2986 }
2987
2988 static int if6_seq_show(struct seq_file *seq, void *v)
2989 {
2990         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2991         seq_printf(seq,
2992                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2993                    NIP6(ifp->addr),
2994                    ifp->idev->dev->ifindex,
2995                    ifp->prefix_len,
2996                    ifp->scope,
2997                    ifp->flags,
2998                    ifp->idev->dev->name);
2999         return 0;
3000 }
3001
3002 static const struct seq_operations if6_seq_ops = {
3003         .start  = if6_seq_start,
3004         .next   = if6_seq_next,
3005         .show   = if6_seq_show,
3006         .stop   = if6_seq_stop,
3007 };
3008
3009 static int if6_seq_open(struct inode *inode, struct file *file)
3010 {
3011         return seq_open_net(inode, file, &if6_seq_ops,
3012                             sizeof(struct if6_iter_state));
3013 }
3014
3015 static const struct file_operations if6_fops = {
3016         .owner          = THIS_MODULE,
3017         .open           = if6_seq_open,
3018         .read           = seq_read,
3019         .llseek         = seq_lseek,
3020         .release        = seq_release_net,
3021 };
3022
3023 static int if6_proc_net_init(struct net *net)
3024 {
3025         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3026                 return -ENOMEM;
3027         return 0;
3028 }
3029
3030 static void if6_proc_net_exit(struct net *net)
3031 {
3032        proc_net_remove(net, "if_inet6");
3033 }
3034
3035 static struct pernet_operations if6_proc_net_ops = {
3036        .init = if6_proc_net_init,
3037        .exit = if6_proc_net_exit,
3038 };
3039
3040 int __init if6_proc_init(void)
3041 {
3042         return register_pernet_subsys(&if6_proc_net_ops);
3043 }
3044
3045 void if6_proc_exit(void)
3046 {
3047         unregister_pernet_subsys(&if6_proc_net_ops);
3048 }
3049 #endif  /* CONFIG_PROC_FS */
3050
3051 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3052 /* Check if address is a home address configured on any interface. */
3053 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3054 {
3055         int ret = 0;
3056         struct inet6_ifaddr * ifp;
3057         u8 hash = ipv6_addr_hash(addr);
3058         read_lock_bh(&addrconf_hash_lock);
3059         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3060                 if (!net_eq(dev_net(ifp->idev->dev), net))
3061                         continue;
3062                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3063                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3064                         ret = 1;
3065                         break;
3066                 }
3067         }
3068         read_unlock_bh(&addrconf_hash_lock);
3069         return ret;
3070 }
3071 #endif
3072
3073 /*
3074  *      Periodic address status verification
3075  */
3076
3077 static void addrconf_verify(unsigned long foo)
3078 {
3079         struct inet6_ifaddr *ifp;
3080         unsigned long now, next;
3081         int i;
3082
3083         spin_lock_bh(&addrconf_verify_lock);
3084         now = jiffies;
3085         next = now + ADDR_CHECK_FREQUENCY;
3086
3087         del_timer(&addr_chk_timer);
3088
3089         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3090
3091 restart:
3092                 read_lock(&addrconf_hash_lock);
3093                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3094                         unsigned long age;
3095 #ifdef CONFIG_IPV6_PRIVACY
3096                         unsigned long regen_advance;
3097 #endif
3098
3099                         if (ifp->flags & IFA_F_PERMANENT)
3100                                 continue;
3101
3102                         spin_lock(&ifp->lock);
3103                         age = (now - ifp->tstamp) / HZ;
3104
3105 #ifdef CONFIG_IPV6_PRIVACY
3106                         regen_advance = ifp->idev->cnf.regen_max_retry *
3107                                         ifp->idev->cnf.dad_transmits *
3108                                         ifp->idev->nd_parms->retrans_time / HZ;
3109 #endif
3110
3111                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3112                             age >= ifp->valid_lft) {
3113                                 spin_unlock(&ifp->lock);
3114                                 in6_ifa_hold(ifp);
3115                                 read_unlock(&addrconf_hash_lock);
3116                                 ipv6_del_addr(ifp);
3117                                 goto restart;
3118                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3119                                 spin_unlock(&ifp->lock);
3120                                 continue;
3121                         } else if (age >= ifp->prefered_lft) {
3122                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3123                                 int deprecate = 0;
3124
3125                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3126                                         deprecate = 1;
3127                                         ifp->flags |= IFA_F_DEPRECATED;
3128                                 }
3129
3130                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3131                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3132
3133                                 spin_unlock(&ifp->lock);
3134
3135                                 if (deprecate) {
3136                                         in6_ifa_hold(ifp);
3137                                         read_unlock(&addrconf_hash_lock);
3138
3139                                         ipv6_ifa_notify(0, ifp);
3140                                         in6_ifa_put(ifp);
3141                                         goto restart;
3142                                 }
3143 #ifdef CONFIG_IPV6_PRIVACY
3144                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3145                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3146                                 if (age >= ifp->prefered_lft - regen_advance) {
3147                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3148                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3149                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3150                                         if (!ifp->regen_count && ifpub) {
3151                                                 ifp->regen_count++;
3152                                                 in6_ifa_hold(ifp);
3153                                                 in6_ifa_hold(ifpub);
3154                                                 spin_unlock(&ifp->lock);
3155                                                 read_unlock(&addrconf_hash_lock);
3156                                                 spin_lock(&ifpub->lock);
3157                                                 ifpub->regen_count = 0;
3158                                                 spin_unlock(&ifpub->lock);
3159                                                 ipv6_create_tempaddr(ifpub, ifp);
3160                                                 in6_ifa_put(ifpub);
3161                                                 in6_ifa_put(ifp);
3162                                                 goto restart;
3163                                         }
3164                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3165                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3166                                 spin_unlock(&ifp->lock);
3167 #endif
3168                         } else {
3169                                 /* ifp->prefered_lft <= ifp->valid_lft */
3170                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3171                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3172                                 spin_unlock(&ifp->lock);
3173                         }
3174                 }
3175                 read_unlock(&addrconf_hash_lock);
3176         }
3177
3178         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3179         add_timer(&addr_chk_timer);
3180         spin_unlock_bh(&addrconf_verify_lock);
3181 }
3182
3183 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3184 {
3185         struct in6_addr *pfx = NULL;
3186
3187         if (addr)
3188                 pfx = nla_data(addr);
3189
3190         if (local) {
3191                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3192                         pfx = NULL;
3193                 else
3194                         pfx = nla_data(local);
3195         }
3196
3197         return pfx;
3198 }
3199
3200 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3201         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3202         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3203         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3204 };
3205
3206 static int
3207 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3208 {
3209         struct net *net = sock_net(skb->sk);
3210         struct ifaddrmsg *ifm;
3211         struct nlattr *tb[IFA_MAX+1];
3212         struct in6_addr *pfx;
3213         int err;
3214
3215         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3216         if (err < 0)
3217                 return err;
3218
3219         ifm = nlmsg_data(nlh);
3220         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3221         if (pfx == NULL)
3222                 return -EINVAL;
3223
3224         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3225 }
3226
3227 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3228                              u32 prefered_lft, u32 valid_lft)
3229 {
3230         u32 flags;
3231         clock_t expires;
3232         unsigned long timeout;
3233
3234         if (!valid_lft || (prefered_lft > valid_lft))
3235                 return -EINVAL;
3236
3237         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3238         if (addrconf_finite_timeout(timeout)) {
3239                 expires = jiffies_to_clock_t(timeout * HZ);
3240                 valid_lft = timeout;
3241                 flags = RTF_EXPIRES;
3242         } else {
3243                 expires = 0;
3244                 flags = 0;
3245                 ifa_flags |= IFA_F_PERMANENT;
3246         }
3247
3248         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3249         if (addrconf_finite_timeout(timeout)) {
3250                 if (timeout == 0)
3251                         ifa_flags |= IFA_F_DEPRECATED;
3252                 prefered_lft = timeout;
3253         }
3254
3255         spin_lock_bh(&ifp->lock);
3256         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3257         ifp->tstamp = jiffies;
3258         ifp->valid_lft = valid_lft;
3259         ifp->prefered_lft = prefered_lft;
3260
3261         spin_unlock_bh(&ifp->lock);
3262         if (!(ifp->flags&IFA_F_TENTATIVE))
3263                 ipv6_ifa_notify(0, ifp);
3264
3265         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3266                               expires, flags);
3267         addrconf_verify(0);
3268
3269         return 0;
3270 }
3271
3272 static int
3273 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3274 {
3275         struct net *net = sock_net(skb->sk);
3276         struct ifaddrmsg *ifm;
3277         struct nlattr *tb[IFA_MAX+1];
3278         struct in6_addr *pfx;
3279         struct inet6_ifaddr *ifa;
3280         struct net_device *dev;
3281         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3282         u8 ifa_flags;
3283         int err;
3284
3285         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3286         if (err < 0)
3287                 return err;
3288
3289         ifm = nlmsg_data(nlh);
3290         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3291         if (pfx == NULL)
3292                 return -EINVAL;
3293
3294         if (tb[IFA_CACHEINFO]) {
3295                 struct ifa_cacheinfo *ci;
3296
3297                 ci = nla_data(tb[IFA_CACHEINFO]);
3298                 valid_lft = ci->ifa_valid;
3299                 preferred_lft = ci->ifa_prefered;
3300         } else {
3301                 preferred_lft = INFINITY_LIFE_TIME;
3302                 valid_lft = INFINITY_LIFE_TIME;
3303         }
3304
3305         dev =  __dev_get_by_index(net, ifm->ifa_index);
3306         if (dev == NULL)
3307                 return -ENODEV;
3308
3309         /* We ignore other flags so far. */
3310         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3311
3312         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3313         if (ifa == NULL) {
3314                 /*
3315                  * It would be best to check for !NLM_F_CREATE here but
3316                  * userspace alreay relies on not having to provide this.
3317                  */
3318                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3319                                       ifm->ifa_prefixlen, ifa_flags,
3320                                       preferred_lft, valid_lft);
3321         }
3322
3323         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3324             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3325                 err = -EEXIST;
3326         else
3327                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3328
3329         in6_ifa_put(ifa);
3330
3331         return err;
3332 }
3333
3334 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3335                           u8 scope, int ifindex)
3336 {
3337         struct ifaddrmsg *ifm;
3338
3339         ifm = nlmsg_data(nlh);
3340         ifm->ifa_family = AF_INET6;
3341         ifm->ifa_prefixlen = prefixlen;
3342         ifm->ifa_flags = flags;
3343         ifm->ifa_scope = scope;
3344         ifm->ifa_index = ifindex;
3345 }
3346
3347 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3348                          unsigned long tstamp, u32 preferred, u32 valid)
3349 {
3350         struct ifa_cacheinfo ci;
3351
3352         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3353                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3354         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3355                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3356         ci.ifa_prefered = preferred;
3357         ci.ifa_valid = valid;
3358
3359         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3360 }
3361
3362 static inline int rt_scope(int ifa_scope)
3363 {
3364         if (ifa_scope & IFA_HOST)
3365                 return RT_SCOPE_HOST;
3366         else if (ifa_scope & IFA_LINK)
3367                 return RT_SCOPE_LINK;
3368         else if (ifa_scope & IFA_SITE)
3369                 return RT_SCOPE_SITE;
3370         else
3371                 return RT_SCOPE_UNIVERSE;
3372 }
3373
3374 static inline int inet6_ifaddr_msgsize(void)
3375 {
3376         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3377                + nla_total_size(16) /* IFA_ADDRESS */
3378                + nla_total_size(sizeof(struct ifa_cacheinfo));
3379 }
3380
3381 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3382                              u32 pid, u32 seq, int event, unsigned int flags)
3383 {
3384         struct nlmsghdr  *nlh;
3385         u32 preferred, valid;
3386
3387         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3388         if (nlh == NULL)
3389                 return -EMSGSIZE;
3390
3391         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3392                       ifa->idev->dev->ifindex);
3393
3394         if (!(ifa->flags&IFA_F_PERMANENT)) {
3395                 preferred = ifa->prefered_lft;
3396                 valid = ifa->valid_lft;
3397                 if (preferred != INFINITY_LIFE_TIME) {
3398                         long tval = (jiffies - ifa->tstamp)/HZ;
3399                         preferred -= tval;
3400                         if (valid != INFINITY_LIFE_TIME)
3401                                 valid -= tval;
3402                 }
3403         } else {
3404                 preferred = INFINITY_LIFE_TIME;
3405                 valid = INFINITY_LIFE_TIME;
3406         }
3407
3408         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3409             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3410                 nlmsg_cancel(skb, nlh);
3411                 return -EMSGSIZE;
3412         }
3413
3414         return nlmsg_end(skb, nlh);
3415 }
3416
3417 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3418                                 u32 pid, u32 seq, int event, u16 flags)
3419 {
3420         struct nlmsghdr  *nlh;
3421         u8 scope = RT_SCOPE_UNIVERSE;
3422         int ifindex = ifmca->idev->dev->ifindex;
3423
3424         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3425                 scope = RT_SCOPE_SITE;
3426
3427         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3428         if (nlh == NULL)
3429                 return -EMSGSIZE;
3430
3431         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3432         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3433             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3434                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3435                 nlmsg_cancel(skb, nlh);
3436                 return -EMSGSIZE;
3437         }
3438
3439         return nlmsg_end(skb, nlh);
3440 }
3441
3442 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3443                                 u32 pid, u32 seq, int event, unsigned int flags)
3444 {
3445         struct nlmsghdr  *nlh;
3446         u8 scope = RT_SCOPE_UNIVERSE;
3447         int ifindex = ifaca->aca_idev->dev->ifindex;
3448
3449         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3450                 scope = RT_SCOPE_SITE;
3451
3452         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3453         if (nlh == NULL)
3454                 return -EMSGSIZE;
3455
3456         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3457         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3458             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3459                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3460                 nlmsg_cancel(skb, nlh);
3461                 return -EMSGSIZE;
3462         }
3463
3464         return nlmsg_end(skb, nlh);
3465 }
3466
3467 enum addr_type_t
3468 {
3469         UNICAST_ADDR,
3470         MULTICAST_ADDR,
3471         ANYCAST_ADDR,
3472 };
3473
3474 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3475                            enum addr_type_t type)
3476 {
3477         int idx, ip_idx;
3478         int s_idx, s_ip_idx;
3479         int err = 1;
3480         struct net_device *dev;
3481         struct inet6_dev *idev = NULL;
3482         struct inet6_ifaddr *ifa;
3483         struct ifmcaddr6 *ifmca;
3484         struct ifacaddr6 *ifaca;
3485         struct net *net = sock_net(skb->sk);
3486
3487         s_idx = cb->args[0];
3488         s_ip_idx = ip_idx = cb->args[1];
3489
3490         idx = 0;
3491         for_each_netdev(net, dev) {
3492                 if (idx < s_idx)
3493                         goto cont;
3494                 if (idx > s_idx)
3495                         s_ip_idx = 0;
3496                 ip_idx = 0;
3497                 if ((idev = in6_dev_get(dev)) == NULL)
3498                         goto cont;
3499                 read_lock_bh(&idev->lock);
3500                 switch (type) {
3501                 case UNICAST_ADDR:
3502                         /* unicast address incl. temp addr */
3503                         for (ifa = idev->addr_list; ifa;
3504                              ifa = ifa->if_next, ip_idx++) {
3505                                 if (ip_idx < s_ip_idx)
3506                                         continue;
3507                                 err = inet6_fill_ifaddr(skb, ifa,
3508                                                         NETLINK_CB(cb->skb).pid,
3509                                                         cb->nlh->nlmsg_seq,
3510                                                         RTM_NEWADDR,
3511                                                         NLM_F_MULTI);
3512                         }
3513                         break;
3514                 case MULTICAST_ADDR:
3515                         /* multicast address */
3516                         for (ifmca = idev->mc_list; ifmca;
3517                              ifmca = ifmca->next, ip_idx++) {
3518                                 if (ip_idx < s_ip_idx)
3519                                         continue;
3520                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3521                                                           NETLINK_CB(cb->skb).pid,
3522                                                           cb->nlh->nlmsg_seq,
3523                                                           RTM_GETMULTICAST,
3524                                                           NLM_F_MULTI);
3525                         }
3526                         break;
3527                 case ANYCAST_ADDR:
3528                         /* anycast address */
3529                         for (ifaca = idev->ac_list; ifaca;
3530                              ifaca = ifaca->aca_next, ip_idx++) {
3531                                 if (ip_idx < s_ip_idx)
3532                                         continue;
3533                                 err = inet6_fill_ifacaddr(skb, ifaca,
3534                                                           NETLINK_CB(cb->skb).pid,
3535                                                           cb->nlh->nlmsg_seq,
3536                                                           RTM_GETANYCAST,
3537                                                           NLM_F_MULTI);
3538                         }
3539                         break;
3540                 default:
3541                         break;
3542                 }
3543                 read_unlock_bh(&idev->lock);
3544                 in6_dev_put(idev);
3545
3546                 if (err <= 0)
3547                         break;
3548 cont:
3549                 idx++;
3550         }
3551         cb->args[0] = idx;
3552         cb->args[1] = ip_idx;
3553         return skb->len;
3554 }
3555
3556 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3557 {
3558         enum addr_type_t type = UNICAST_ADDR;
3559
3560         return inet6_dump_addr(skb, cb, type);
3561 }
3562
3563 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3564 {
3565         enum addr_type_t type = MULTICAST_ADDR;
3566
3567         return inet6_dump_addr(skb, cb, type);
3568 }
3569
3570
3571 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3572 {
3573         enum addr_type_t type = ANYCAST_ADDR;
3574
3575         return inet6_dump_addr(skb, cb, type);
3576 }
3577
3578 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3579                              void *arg)
3580 {
3581         struct net *net = sock_net(in_skb->sk);
3582         struct ifaddrmsg *ifm;
3583         struct nlattr *tb[IFA_MAX+1];
3584         struct in6_addr *addr = NULL;
3585         struct net_device *dev = NULL;
3586         struct inet6_ifaddr *ifa;
3587         struct sk_buff *skb;
3588         int err;
3589
3590         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3591         if (err < 0)
3592                 goto errout;
3593
3594         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3595         if (addr == NULL) {
3596                 err = -EINVAL;
3597                 goto errout;
3598         }
3599
3600         ifm = nlmsg_data(nlh);
3601         if (ifm->ifa_index)
3602                 dev = __dev_get_by_index(net, ifm->ifa_index);
3603
3604         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3605                 err = -EADDRNOTAVAIL;
3606                 goto errout;
3607         }
3608
3609         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3610                 err = -ENOBUFS;
3611                 goto errout_ifa;
3612         }
3613
3614         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3615                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3616         if (err < 0) {
3617                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3618                 WARN_ON(err == -EMSGSIZE);
3619                 kfree_skb(skb);
3620                 goto errout_ifa;
3621         }
3622         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3623 errout_ifa:
3624         in6_ifa_put(ifa);
3625 errout:
3626         return err;
3627 }
3628
3629 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3630 {
3631         struct sk_buff *skb;
3632         struct net *net = dev_net(ifa->idev->dev);
3633         int err = -ENOBUFS;
3634
3635         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3636         if (skb == NULL)
3637                 goto errout;
3638
3639         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3640         if (err < 0) {
3641                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3642                 WARN_ON(err == -EMSGSIZE);
3643                 kfree_skb(skb);
3644                 goto errout;
3645         }
3646         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3647 errout:
3648         if (err < 0)
3649                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3650 }
3651
3652 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3653                                 __s32 *array, int bytes)
3654 {
3655         BUG_ON(bytes < (DEVCONF_MAX * 4));
3656
3657         memset(array, 0, bytes);
3658         array[DEVCONF_FORWARDING] = cnf->forwarding;
3659         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3660         array[DEVCONF_MTU6] = cnf->mtu6;
3661         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3662         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3663         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3664         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3665         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3666         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3667         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3668         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3669 #ifdef CONFIG_IPV6_PRIVACY
3670         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3671         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3672         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3673         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3674         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3675 #endif
3676         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3677         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3678         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3679 #ifdef CONFIG_IPV6_ROUTER_PREF
3680         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3681         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3682 #ifdef CONFIG_IPV6_ROUTE_INFO
3683         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3684 #endif
3685 #endif
3686         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3687         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3688 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3689         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3690 #endif
3691 #ifdef CONFIG_IPV6_MROUTE
3692         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3693 #endif
3694         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3695         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3696 }
3697
3698 static inline size_t inet6_if_nlmsg_size(void)
3699 {
3700         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3701                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3702                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3703                + nla_total_size(4) /* IFLA_MTU */
3704                + nla_total_size(4) /* IFLA_LINK */
3705                + nla_total_size( /* IFLA_PROTINFO */
3706                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3707                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3708                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3709                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3710                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3711                  );
3712 }
3713
3714 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3715                                       int bytes)
3716 {
3717         int i;
3718         int pad = bytes - sizeof(u64) * items;
3719         BUG_ON(pad < 0);
3720
3721         /* Use put_unaligned() because stats may not be aligned for u64. */
3722         put_unaligned(items, &stats[0]);
3723         for (i = 1; i < items; i++)
3724                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3725
3726         memset(&stats[items], 0, pad);
3727 }
3728
3729 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3730                              int bytes)
3731 {
3732         switch(attrtype) {
3733         case IFLA_INET6_STATS:
3734                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3735                 break;
3736         case IFLA_INET6_ICMP6STATS:
3737                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3738                 break;
3739         }
3740 }
3741
3742 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3743                              u32 pid, u32 seq, int event, unsigned int flags)
3744 {
3745         struct net_device *dev = idev->dev;
3746         struct nlattr *nla;
3747         struct ifinfomsg *hdr;
3748         struct nlmsghdr *nlh;
3749         void *protoinfo;
3750         struct ifla_cacheinfo ci;
3751
3752         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3753         if (nlh == NULL)
3754                 return -EMSGSIZE;
3755
3756         hdr = nlmsg_data(nlh);
3757         hdr->ifi_family = AF_INET6;
3758         hdr->__ifi_pad = 0;
3759         hdr->ifi_type = dev->type;
3760         hdr->ifi_index = dev->ifindex;
3761         hdr->ifi_flags = dev_get_flags(dev);
3762         hdr->ifi_change = 0;
3763
3764         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3765
3766         if (dev->addr_len)
3767                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3768
3769         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3770         if (dev->ifindex != dev->iflink)
3771                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3772
3773         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3774         if (protoinfo == NULL)
3775                 goto nla_put_failure;
3776
3777         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3778
3779         ci.max_reasm_len = IPV6_MAXPLEN;
3780         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3781                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3782         ci.reachable_time = idev->nd_parms->reachable_time;
3783         ci.retrans_time = idev->nd_parms->retrans_time;
3784         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3785
3786         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3787         if (nla == NULL)
3788                 goto nla_put_failure;
3789         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3790
3791         /* XXX - MC not implemented */
3792
3793         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3794         if (nla == NULL)
3795                 goto nla_put_failure;
3796         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3797
3798         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3799         if (nla == NULL)
3800                 goto nla_put_failure;
3801         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3802
3803         nla_nest_end(skb, protoinfo);
3804         return nlmsg_end(skb, nlh);
3805
3806 nla_put_failure:
3807         nlmsg_cancel(skb, nlh);
3808         return -EMSGSIZE;
3809 }
3810
3811 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3812 {
3813         struct net *net = sock_net(skb->sk);
3814         int idx, err;
3815         int s_idx = cb->args[0];
3816         struct net_device *dev;
3817         struct inet6_dev *idev;
3818
3819         read_lock(&dev_base_lock);
3820         idx = 0;
3821         for_each_netdev(net, dev) {
3822                 if (idx < s_idx)
3823                         goto cont;
3824                 if ((idev = in6_dev_get(dev)) == NULL)
3825                         goto cont;
3826                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3827                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3828                 in6_dev_put(idev);
3829                 if (err <= 0)
3830                         break;
3831 cont:
3832                 idx++;
3833         }
3834         read_unlock(&dev_base_lock);
3835         cb->args[0] = idx;
3836
3837         return skb->len;
3838 }
3839
3840 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3841 {
3842         struct sk_buff *skb;
3843         struct net *net = dev_net(idev->dev);
3844         int err = -ENOBUFS;
3845
3846         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3847         if (skb == NULL)
3848                 goto errout;
3849
3850         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3851         if (err < 0) {
3852                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3853                 WARN_ON(err == -EMSGSIZE);
3854                 kfree_skb(skb);
3855                 goto errout;
3856         }
3857         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3858 errout:
3859         if (err < 0)
3860                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3861 }
3862
3863 static inline size_t inet6_prefix_nlmsg_size(void)
3864 {
3865         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3866                + nla_total_size(sizeof(struct in6_addr))
3867                + nla_total_size(sizeof(struct prefix_cacheinfo));
3868 }
3869
3870 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3871                              struct prefix_info *pinfo, u32 pid, u32 seq,
3872                              int event, unsigned int flags)
3873 {
3874         struct prefixmsg *pmsg;
3875         struct nlmsghdr *nlh;
3876         struct prefix_cacheinfo ci;
3877
3878         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3879         if (nlh == NULL)
3880                 return -EMSGSIZE;
3881
3882         pmsg = nlmsg_data(nlh);
3883         pmsg->prefix_family = AF_INET6;
3884         pmsg->prefix_pad1 = 0;
3885         pmsg->prefix_pad2 = 0;
3886         pmsg->prefix_ifindex = idev->dev->ifindex;
3887         pmsg->prefix_len = pinfo->prefix_len;
3888         pmsg->prefix_type = pinfo->type;
3889         pmsg->prefix_pad3 = 0;
3890         pmsg->prefix_flags = 0;
3891         if (pinfo->onlink)
3892                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3893         if (pinfo->autoconf)
3894                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3895
3896         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3897
3898         ci.preferred_time = ntohl(pinfo->prefered);
3899         ci.valid_time = ntohl(pinfo->valid);
3900         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3901
3902         return nlmsg_end(skb, nlh);
3903
3904 nla_put_failure:
3905         nlmsg_cancel(skb, nlh);
3906         return -EMSGSIZE;
3907 }
3908
3909 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3910                          struct prefix_info *pinfo)
3911 {
3912         struct sk_buff *skb;
3913         struct net *net = dev_net(idev->dev);
3914         int err = -ENOBUFS;
3915
3916         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3917         if (skb == NULL)
3918                 goto errout;
3919
3920         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3921         if (err < 0) {
3922                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3923                 WARN_ON(err == -EMSGSIZE);
3924                 kfree_skb(skb);
3925                 goto errout;
3926         }
3927         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3928 errout:
3929         if (err < 0)
3930                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3931 }
3932
3933 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3934 {
3935         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3936
3937         switch (event) {
3938         case RTM_NEWADDR:
3939                 /*
3940                  * If the address was optimistic
3941                  * we inserted the route at the start of
3942                  * our DAD process, so we don't need
3943                  * to do it again
3944                  */
3945                 if (!(ifp->rt->rt6i_node))
3946                         ip6_ins_rt(ifp->rt);
3947                 if (ifp->idev->cnf.forwarding)
3948                         addrconf_join_anycast(ifp);
3949                 break;
3950         case RTM_DELADDR:
3951                 if (ifp->idev->cnf.forwarding)
3952                         addrconf_leave_anycast(ifp);
3953                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3954                 dst_hold(&ifp->rt->u.dst);
3955                 if (ip6_del_rt(ifp->rt))
3956                         dst_free(&ifp->rt->u.dst);
3957                 break;
3958         }
3959 }
3960
3961 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3962 {
3963         rcu_read_lock_bh();
3964         if (likely(ifp->idev->dead == 0))
3965                 __ipv6_ifa_notify(event, ifp);
3966         rcu_read_unlock_bh();
3967 }
3968
3969 #ifdef CONFIG_SYSCTL
3970
3971 static
3972 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3973                            void __user *buffer, size_t *lenp, loff_t *ppos)
3974 {
3975         int *valp = ctl->data;
3976         int val = *valp;
3977         int ret;
3978
3979         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3980
3981         if (write)
3982                 addrconf_fixup_forwarding(ctl, valp, val);
3983         return ret;
3984 }
3985
3986 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3987                                             void __user *oldval,
3988                                             size_t __user *oldlenp,
3989                                             void __user *newval, size_t newlen)
3990 {
3991         int *valp = table->data;
3992         int val = *valp;
3993         int new;
3994
3995         if (!newval || !newlen)
3996                 return 0;
3997         if (newlen != sizeof(int))
3998                 return -EINVAL;
3999         if (get_user(new, (int __user *)newval))
4000                 return -EFAULT;
4001         if (new == *valp)
4002                 return 0;
4003         if (oldval && oldlenp) {
4004                 size_t len;
4005                 if (get_user(len, oldlenp))
4006                         return -EFAULT;
4007                 if (len) {
4008                         if (len > table->maxlen)
4009                                 len = table->maxlen;
4010                         if (copy_to_user(oldval, valp, len))
4011                                 return -EFAULT;
4012                         if (put_user(len, oldlenp))
4013                                 return -EFAULT;
4014                 }
4015         }
4016
4017         *valp = new;
4018         addrconf_fixup_forwarding(table, valp, val);
4019         return 1;
4020 }
4021
4022 static struct addrconf_sysctl_table
4023 {
4024         struct ctl_table_header *sysctl_header;
4025         ctl_table addrconf_vars[DEVCONF_MAX+1];
4026         char *dev_name;
4027 } addrconf_sysctl __read_mostly = {
4028         .sysctl_header = NULL,
4029         .addrconf_vars = {
4030                 {
4031                         .ctl_name       =       NET_IPV6_FORWARDING,
4032                         .procname       =       "forwarding",
4033                         .data           =       &ipv6_devconf.forwarding,
4034                         .maxlen         =       sizeof(int),
4035                         .mode           =       0644,
4036                         .proc_handler   =       &addrconf_sysctl_forward,
4037                         .strategy       =       &addrconf_sysctl_forward_strategy,
4038                 },
4039                 {
4040                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
4041                         .procname       =       "hop_limit",
4042                         .data           =       &ipv6_devconf.hop_limit,
4043                         .maxlen         =       sizeof(int),
4044                         .mode           =       0644,
4045                         .proc_handler   =       proc_dointvec,
4046                 },
4047                 {
4048                         .ctl_name       =       NET_IPV6_MTU,
4049                         .procname       =       "mtu",
4050                         .data           =       &ipv6_devconf.mtu6,
4051                         .maxlen         =       sizeof(int),
4052                         .mode           =       0644,
4053                         .proc_handler   =       &proc_dointvec,
4054                 },
4055                 {
4056                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
4057                         .procname       =       "accept_ra",
4058                         .data           =       &ipv6_devconf.accept_ra,
4059                         .maxlen         =       sizeof(int),
4060                         .mode           =       0644,
4061                         .proc_handler   =       &proc_dointvec,
4062                 },
4063                 {
4064                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
4065                         .procname       =       "accept_redirects",
4066                         .data           =       &ipv6_devconf.accept_redirects,
4067                         .maxlen         =       sizeof(int),
4068                         .mode           =       0644,
4069                         .proc_handler   =       &proc_dointvec,
4070                 },
4071                 {
4072                         .ctl_name       =       NET_IPV6_AUTOCONF,
4073                         .procname       =       "autoconf",
4074                         .data           =       &ipv6_devconf.autoconf,
4075                         .maxlen         =       sizeof(int),
4076                         .mode           =       0644,
4077                         .proc_handler   =       &proc_dointvec,
4078                 },
4079                 {
4080                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
4081                         .procname       =       "dad_transmits",
4082                         .data           =       &ipv6_devconf.dad_transmits,
4083                         .maxlen         =       sizeof(int),
4084                         .mode           =       0644,
4085                         .proc_handler   =       &proc_dointvec,
4086                 },
4087                 {
4088                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
4089                         .procname       =       "router_solicitations",
4090                         .data           =       &ipv6_devconf.rtr_solicits,
4091                         .maxlen         =       sizeof(int),
4092                         .mode           =       0644,
4093                         .proc_handler   =       &proc_dointvec,
4094                 },
4095                 {
4096                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
4097                         .procname       =       "router_solicitation_interval",
4098                         .data           =       &ipv6_devconf.rtr_solicit_interval,
4099                         .maxlen         =       sizeof(int),
4100                         .mode           =       0644,
4101                         .proc_handler   =       &proc_dointvec_jiffies,
4102                         .strategy       =       &sysctl_jiffies,
4103                 },
4104                 {
4105                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
4106                         .procname       =       "router_solicitation_delay",
4107                         .data           =       &ipv6_devconf.rtr_solicit_delay,
4108                         .maxlen         =       sizeof(int),
4109                         .mode           =       0644,
4110                         .proc_handler   =       &proc_dointvec_jiffies,
4111                         .strategy       =       &sysctl_jiffies,
4112                 },
4113                 {
4114                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
4115                         .procname       =       "force_mld_version",
4116                         .data           =       &ipv6_devconf.force_mld_version,
4117                         .maxlen         =       sizeof(int),
4118                         .mode           =       0644,
4119                         .proc_handler   =       &proc_dointvec,
4120                 },
4121 #ifdef CONFIG_IPV6_PRIVACY
4122                 {
4123                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
4124                         .procname       =       "use_tempaddr",
4125                         .data           =       &ipv6_devconf.use_tempaddr,
4126                         .maxlen         =       sizeof(int),
4127                         .mode           =       0644,
4128                         .proc_handler   =       &proc_dointvec,
4129                 },
4130                 {
4131                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
4132                         .procname       =       "temp_valid_lft",
4133                         .data           =       &ipv6_devconf.temp_valid_lft,
4134                         .maxlen         =       sizeof(int),
4135                         .mode           =       0644,
4136                         .proc_handler   =       &proc_dointvec,
4137                 },
4138                 {
4139                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4140                         .procname       =       "temp_prefered_lft",
4141                         .data           =       &ipv6_devconf.temp_prefered_lft,
4142                         .maxlen         =       sizeof(int),
4143                         .mode           =       0644,
4144                         .proc_handler   =       &proc_dointvec,
4145                 },
4146                 {
4147                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4148                         .procname       =       "regen_max_retry",
4149                         .data           =       &ipv6_devconf.regen_max_retry,
4150                         .maxlen         =       sizeof(int),
4151                         .mode           =       0644,
4152                         .proc_handler   =       &proc_dointvec,
4153                 },
4154                 {
4155                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4156                         .procname       =       "max_desync_factor",
4157                         .data           =       &ipv6_devconf.max_desync_factor,
4158                         .maxlen         =       sizeof(int),
4159                         .mode           =       0644,
4160                         .proc_handler   =       &proc_dointvec,
4161                 },
4162 #endif
4163                 {
4164                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4165                         .procname       =       "max_addresses",
4166                         .data           =       &ipv6_devconf.max_addresses,
4167                         .maxlen         =       sizeof(int),
4168                         .mode           =       0644,
4169                         .proc_handler   =       &proc_dointvec,
4170                 },
4171                 {
4172                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4173                         .procname       =       "accept_ra_defrtr",
4174                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4175                         .maxlen         =       sizeof(int),
4176                         .mode           =       0644,
4177                         .proc_handler   =       &proc_dointvec,
4178                 },
4179                 {
4180                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4181                         .procname       =       "accept_ra_pinfo",
4182                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4183                         .maxlen         =       sizeof(int),
4184                         .mode           =       0644,
4185                         .proc_handler   =       &proc_dointvec,
4186                 },
4187 #ifdef CONFIG_IPV6_ROUTER_PREF
4188                 {
4189                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4190                         .procname       =       "accept_ra_rtr_pref",
4191                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4192                         .maxlen         =       sizeof(int),
4193                         .mode           =       0644,
4194                         .proc_handler   =       &proc_dointvec,
4195                 },
4196                 {
4197                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4198                         .procname       =       "router_probe_interval",
4199                         .data           =       &ipv6_devconf.rtr_probe_interval,
4200                         .maxlen         =       sizeof(int),
4201                         .mode           =       0644,
4202                         .proc_handler   =       &proc_dointvec_jiffies,
4203                         .strategy       =       &sysctl_jiffies,
4204                 },
4205 #ifdef CONFIG_IPV6_ROUTE_INFO
4206                 {
4207                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4208                         .procname       =       "accept_ra_rt_info_max_plen",
4209                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4210                         .maxlen         =       sizeof(int),
4211                         .mode           =       0644,
4212                         .proc_handler   =       &proc_dointvec,
4213                 },
4214 #endif
4215 #endif
4216                 {
4217                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4218                         .procname       =       "proxy_ndp",
4219                         .data           =       &ipv6_devconf.proxy_ndp,
4220                         .maxlen         =       sizeof(int),
4221                         .mode           =       0644,
4222                         .proc_handler   =       &proc_dointvec,
4223                 },
4224                 {
4225                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4226                         .procname       =       "accept_source_route",
4227                         .data           =       &ipv6_devconf.accept_source_route,
4228                         .maxlen         =       sizeof(int),
4229                         .mode           =       0644,
4230                         .proc_handler   =       &proc_dointvec,
4231                 },
4232 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4233                 {
4234                         .ctl_name       =       CTL_UNNUMBERED,
4235                         .procname       =       "optimistic_dad",
4236                         .data           =       &ipv6_devconf.optimistic_dad,
4237                         .maxlen         =       sizeof(int),
4238                         .mode           =       0644,
4239                         .proc_handler   =       &proc_dointvec,
4240
4241                 },
4242 #endif
4243 #ifdef CONFIG_IPV6_MROUTE
4244                 {
4245                         .ctl_name       =       CTL_UNNUMBERED,
4246                         .procname       =       "mc_forwarding",
4247                         .data           =       &ipv6_devconf.mc_forwarding,
4248                         .maxlen         =       sizeof(int),
4249                         .mode           =       0644,
4250                         .proc_handler   =       &proc_dointvec,
4251                 },
4252 #endif
4253                 {
4254                         .ctl_name       =       CTL_UNNUMBERED,
4255                         .procname       =       "disable_ipv6",
4256                         .data           =       &ipv6_devconf.disable_ipv6,
4257                         .maxlen         =       sizeof(int),
4258                         .mode           =       0644,
4259                         .proc_handler   =       &proc_dointvec,
4260                 },
4261                 {
4262                         .ctl_name       =       CTL_UNNUMBERED,
4263                         .procname       =       "accept_dad",
4264                         .data           =       &ipv6_devconf.accept_dad,
4265                         .maxlen         =       sizeof(int),
4266                         .mode           =       0644,
4267                         .proc_handler   =       &proc_dointvec,
4268                 },
4269                 {
4270                         .ctl_name       =       0,      /* sentinel */
4271                 }
4272         },
4273 };
4274
4275 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4276                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4277 {
4278         int i;
4279         struct addrconf_sysctl_table *t;
4280
4281 #define ADDRCONF_CTL_PATH_DEV   3
4282
4283         struct ctl_path addrconf_ctl_path[] = {
4284                 { .procname = "net", .ctl_name = CTL_NET, },
4285                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4286                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4287                 { /* to be set */ },
4288                 { },
4289         };
4290
4291
4292         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4293         if (t == NULL)
4294                 goto out;
4295
4296         for (i=0; t->addrconf_vars[i].data; i++) {
4297                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4298                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4299                 t->addrconf_vars[i].extra2 = net;
4300         }
4301
4302         /*
4303          * Make a copy of dev_name, because '.procname' is regarded as const
4304          * by sysctl and we wouldn't want anyone to change it under our feet
4305          * (see SIOCSIFNAME).
4306          */
4307         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4308         if (!t->dev_name)
4309                 goto free;
4310
4311         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4312         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4313
4314         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4315                         t->addrconf_vars);
4316         if (t->sysctl_header == NULL)
4317                 goto free_procname;
4318
4319         p->sysctl = t;
4320         return 0;
4321
4322 free_procname:
4323         kfree(t->dev_name);
4324 free:
4325         kfree(t);
4326 out:
4327         return -ENOBUFS;
4328 }
4329
4330 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4331 {
4332         struct addrconf_sysctl_table *t;
4333
4334         if (p->sysctl == NULL)
4335                 return;
4336
4337         t = p->sysctl;
4338         p->sysctl = NULL;
4339         unregister_sysctl_table(t->sysctl_header);
4340         kfree(t->dev_name);
4341         kfree(t);
4342 }
4343
4344 static void addrconf_sysctl_register(struct inet6_dev *idev)
4345 {
4346         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4347                               NET_IPV6_NEIGH, "ipv6",
4348                               &ndisc_ifinfo_sysctl_change,
4349                               ndisc_ifinfo_sysctl_strategy);
4350         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4351                         idev->dev->ifindex, idev, &idev->cnf);
4352 }
4353
4354 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4355 {
4356         __addrconf_sysctl_unregister(&idev->cnf);
4357         neigh_sysctl_unregister(idev->nd_parms);
4358 }
4359
4360
4361 #endif
4362
4363 static int addrconf_init_net(struct net *net)
4364 {
4365         int err;
4366         struct ipv6_devconf *all, *dflt;
4367
4368         err = -ENOMEM;
4369         all = &ipv6_devconf;
4370         dflt = &ipv6_devconf_dflt;
4371
4372         if (net != &init_net) {
4373                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4374                 if (all == NULL)
4375                         goto err_alloc_all;
4376
4377                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4378                 if (dflt == NULL)
4379                         goto err_alloc_dflt;
4380         }
4381
4382         net->ipv6.devconf_all = all;
4383         net->ipv6.devconf_dflt = dflt;
4384
4385 #ifdef CONFIG_SYSCTL
4386         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4387                         NULL, all);
4388         if (err < 0)
4389                 goto err_reg_all;
4390
4391         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4392                         NULL, dflt);
4393         if (err < 0)
4394                 goto err_reg_dflt;
4395 #endif
4396         return 0;
4397
4398 #ifdef CONFIG_SYSCTL
4399 err_reg_dflt:
4400         __addrconf_sysctl_unregister(all);
4401 err_reg_all:
4402         kfree(dflt);
4403 #endif
4404 err_alloc_dflt:
4405         kfree(all);
4406 err_alloc_all:
4407         return err;
4408 }
4409
4410 static void addrconf_exit_net(struct net *net)
4411 {
4412 #ifdef CONFIG_SYSCTL
4413         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4414         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4415 #endif
4416         if (net != &init_net) {
4417                 kfree(net->ipv6.devconf_dflt);
4418                 kfree(net->ipv6.devconf_all);
4419         }
4420 }
4421
4422 static struct pernet_operations addrconf_ops = {
4423         .init = addrconf_init_net,
4424         .exit = addrconf_exit_net,
4425 };
4426
4427 /*
4428  *      Device notifier
4429  */
4430
4431 int register_inet6addr_notifier(struct notifier_block *nb)
4432 {
4433         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4434 }
4435
4436 EXPORT_SYMBOL(register_inet6addr_notifier);
4437
4438 int unregister_inet6addr_notifier(struct notifier_block *nb)
4439 {
4440         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4441 }
4442
4443 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4444
4445 static void addrconf_net_exit(struct net *net)
4446 {
4447         struct net_device *dev;
4448
4449         rtnl_lock();
4450         /* clean dev list */
4451         for_each_netdev(net, dev) {
4452                 if (__in6_dev_get(dev) == NULL)
4453                         continue;
4454                 addrconf_ifdown(dev, 1);
4455         }
4456         addrconf_ifdown(net->loopback_dev, 2);
4457         rtnl_unlock();
4458 }
4459
4460 static struct pernet_operations addrconf_net_ops = {
4461         .exit = addrconf_net_exit,
4462 };
4463
4464 /*
4465  *      Init / cleanup code
4466  */
4467
4468 int __init addrconf_init(void)
4469 {
4470         int err;
4471
4472         if ((err = ipv6_addr_label_init()) < 0) {
4473                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4474                         err);
4475                 return err;
4476         }
4477
4478         register_pernet_subsys(&addrconf_ops);
4479
4480         /* The addrconf netdev notifier requires that loopback_dev
4481          * has it's ipv6 private information allocated and setup
4482          * before it can bring up and give link-local addresses
4483          * to other devices which are up.
4484          *
4485          * Unfortunately, loopback_dev is not necessarily the first
4486          * entry in the global dev_base list of net devices.  In fact,
4487          * it is likely to be the very last entry on that list.
4488          * So this causes the notifier registry below to try and
4489          * give link-local addresses to all devices besides loopback_dev
4490          * first, then loopback_dev, which cases all the non-loopback_dev
4491          * devices to fail to get a link-local address.
4492          *
4493          * So, as a temporary fix, allocate the ipv6 structure for
4494          * loopback_dev first by hand.
4495          * Longer term, all of the dependencies ipv6 has upon the loopback
4496          * device and it being up should be removed.
4497          */
4498         rtnl_lock();
4499         if (!ipv6_add_dev(init_net.loopback_dev))
4500                 err = -ENOMEM;
4501         rtnl_unlock();
4502         if (err)
4503                 goto errlo;
4504
4505         err = register_pernet_device(&addrconf_net_ops);
4506         if (err)
4507                 return err;
4508
4509         register_netdevice_notifier(&ipv6_dev_notf);
4510
4511         addrconf_verify(0);
4512
4513         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4514         if (err < 0)
4515                 goto errout;
4516
4517         /* Only the first call to __rtnl_register can fail */
4518         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4519         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4520         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4521         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4522         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4523
4524         ipv6_addr_label_rtnl_register();
4525
4526         return 0;
4527 errout:
4528         unregister_netdevice_notifier(&ipv6_dev_notf);
4529 errlo:
4530         unregister_pernet_subsys(&addrconf_ops);
4531
4532         return err;
4533 }
4534
4535 void addrconf_cleanup(void)
4536 {
4537         struct inet6_ifaddr *ifa;
4538         int i;
4539
4540         unregister_netdevice_notifier(&ipv6_dev_notf);
4541         unregister_pernet_device(&addrconf_net_ops);
4542
4543         unregister_pernet_subsys(&addrconf_ops);
4544
4545         rtnl_lock();
4546
4547         /*
4548          *      Check hash table.
4549          */
4550         write_lock_bh(&addrconf_hash_lock);
4551         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4552                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4553                         struct inet6_ifaddr *bifa;
4554
4555                         bifa = ifa;
4556                         ifa = ifa->lst_next;
4557                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4558                         /* Do not free it; something is wrong.
4559                            Now we can investigate it with debugger.
4560                          */
4561                 }
4562         }
4563         write_unlock_bh(&addrconf_hash_lock);
4564
4565         del_timer(&addr_chk_timer);
4566         rtnl_unlock();
4567
4568         unregister_pernet_subsys(&addrconf_net_ops);
4569 }