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