net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/sched.h>
  48 #include <linux/net.h>
  49 #include <linux/in6.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/sock.h>
  66 #include <net/snmp.h>
  67
  68 #include <net/ipv6.h>
  69 #include <net/protocol.h>
  70 #include <net/ndisc.h>
  71 #include <net/ip6_route.h>
  72 #include <net/addrconf.h>
  73 #include <net/tcp.h>
  74 #include <net/ip.h>
  75 #include <linux/if_tunnel.h>
  76 #include <linux/rtnetlink.h>
  77
  78 #ifdef CONFIG_IPV6_PRIVACY
  79 #include <linux/random.h>
  80 #endif
  81
  82 #include <asm/uaccess.h>
  83
  84 #include <linux/proc_fs.h>
  85 #include <linux/seq_file.h>
  86
  87 /* Set to 3 to get tracing... */
  88 #define ACONF_DEBUG 2
  89
  90 #if ACONF_DEBUG >= 3
  91 #define ADBG(x) printk x
  92 #else
  93 #define ADBG(x)
  94 #endif
  95
  96 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  97 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  98
  99 #ifdef CONFIG_SYSCTL
 100 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 101 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 102 #endif
 103
 104 #ifdef CONFIG_IPV6_PRIVACY
 105 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 106 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 107 static void ipv6_regen_rndid(unsigned long data);
 108
 109 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 110 #endif
 111
 112 static int ipv6_count_addresses(struct inet6_dev *idev);
 113
 114 /*
 115  *      Configured unicast address hash table
 116  */
 117 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 118 static DEFINE_RWLOCK(addrconf_hash_lock);
 119
 120 /* Protects inet6 devices */
 121 DEFINE_RWLOCK(addrconf_lock);
 122
 123 static void addrconf_verify(unsigned long);
 124
 125 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 126 static DEFINE_SPINLOCK(addrconf_verify_lock);
 127
 128 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 129 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 130
 131 static int addrconf_ifdown(struct net_device *dev, int how);
 132
 133 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 134 static void addrconf_dad_timer(unsigned long data);
 135 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 136 static void addrconf_dad_run(struct inet6_dev *idev);
 137 static void addrconf_rs_timer(unsigned long data);
 138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140
 141 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 142                                 struct prefix_info *pinfo);
 143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 144
 145 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 146
 147 struct ipv6_devconf ipv6_devconf = {
 148         .forwarding             = 0,
 149         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 150         .mtu6                   = IPV6_MIN_MTU,
 151         .accept_ra              = 1,
 152         .accept_redirects       = 1,
 153         .autoconf               = 1,
 154         .force_mld_version      = 0,
 155         .dad_transmits          = 1,
 156         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 157         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 158         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 159 #ifdef CONFIG_IPV6_PRIVACY
 160         .use_tempaddr           = 0,
 161         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 162         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 163         .regen_max_retry        = REGEN_MAX_RETRY,
 164         .max_desync_factor      = MAX_DESYNC_FACTOR,
 165 #endif
 166         .max_addresses          = IPV6_MAX_ADDRESSES,
 167         .accept_ra_defrtr       = 1,
 168         .accept_ra_pinfo        = 1,
 169 #ifdef CONFIG_IPV6_ROUTER_PREF
 170         .accept_ra_rtr_pref     = 1,
 171         .rtr_probe_interval     = 60 * HZ,
 172 #ifdef CONFIG_IPV6_ROUTE_INFO
 173         .accept_ra_rt_info_max_plen = 0,
 174 #endif
 175 #endif
 176 };
 177
 178 static struct ipv6_devconf ipv6_devconf_dflt = {
 179         .forwarding             = 0,
 180         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 181         .mtu6                   = IPV6_MIN_MTU,
 182         .accept_ra              = 1,
 183         .accept_redirects       = 1,
 184         .autoconf               = 1,
 185         .dad_transmits          = 1,
 186         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 187         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 188         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 189 #ifdef CONFIG_IPV6_PRIVACY
 190         .use_tempaddr           = 0,
 191         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 192         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 193         .regen_max_retry        = REGEN_MAX_RETRY,
 194         .max_desync_factor      = MAX_DESYNC_FACTOR,
 195 #endif
 196         .max_addresses          = IPV6_MAX_ADDRESSES,
 197         .accept_ra_defrtr       = 1,
 198         .accept_ra_pinfo        = 1,
 199 #ifdef CONFIG_IPV6_ROUTER_PREF
 200         .accept_ra_rtr_pref     = 1,
 201         .rtr_probe_interval     = 60 * HZ,
 202 #ifdef CONFIG_IPV6_ROUTE_INFO
 203         .accept_ra_rt_info_max_plen = 0,
 204 #endif
 205 #endif
 206 };
 207
 208 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 209 #if 0
 210 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 211 #endif
 212 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 213
 214 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 215
 216 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 217 {
 218         switch(scope) {
 219         case IPV6_ADDR_SCOPE_NODELOCAL:
 220                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 221                         IPV6_ADDR_LOOPBACK);
 222         case IPV6_ADDR_SCOPE_LINKLOCAL:
 223                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 224                         IPV6_ADDR_LINKLOCAL);
 225         case IPV6_ADDR_SCOPE_SITELOCAL:
 226                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 227                         IPV6_ADDR_SITELOCAL);
 228         }
 229         return IPV6_ADDR_SCOPE_TYPE(scope);
 230 }
 231
 232 int __ipv6_addr_type(const struct in6_addr *addr)
 233 {
 234         u32 st;
 235
 236         st = addr->s6_addr32[0];
 237
 238         /* Consider all addresses with the first three bits different of
 239            000 and 111 as unicasts.
 240          */
 241         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 242             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 243                 return (IPV6_ADDR_UNICAST |
 244                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 245
 246         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 247                 /* multicast */
 248                 /* addr-select 3.1 */
 249                 return (IPV6_ADDR_MULTICAST |
 250                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 251         }
 252
 253         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 254                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 255                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 256         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 257                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 258                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 259
 260         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 261                 if (addr->s6_addr32[2] == 0) {
 262                         if (addr->s6_addr32[3] == 0)
 263                                 return IPV6_ADDR_ANY;
 264
 265                         if (addr->s6_addr32[3] == htonl(0x00000001))
 266                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 267                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 268
 269                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 270                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 271                 }
 272
 273                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 274                         return (IPV6_ADDR_MAPPED |
 275                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 276         }
 277
 278         return (IPV6_ADDR_RESERVED |
 279                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 280 }
 281
 282 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 283 {
 284         if (del_timer(&ifp->timer))
 285                 __in6_ifa_put(ifp);
 286 }
 287
 288 enum addrconf_timer_t
 289 {
 290         AC_NONE,
 291         AC_DAD,
 292         AC_RS,
 293 };
 294
 295 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 296                                enum addrconf_timer_t what,
 297                                unsigned long when)
 298 {
 299         if (!del_timer(&ifp->timer))
 300                 in6_ifa_hold(ifp);
 301
 302         switch (what) {
 303         case AC_DAD:
 304                 ifp->timer.function = addrconf_dad_timer;
 305                 break;
 306         case AC_RS:
 307                 ifp->timer.function = addrconf_rs_timer;
 308                 break;
 309         default:;
 310         }
 311         ifp->timer.expires = jiffies + when;
 312         add_timer(&ifp->timer);
 313 }
 314
 315 /* Nobody refers to this device, we may destroy it. */
 316
 317 void in6_dev_finish_destroy(struct inet6_dev *idev)
 318 {
 319         struct net_device *dev = idev->dev;
 320         BUG_TRAP(idev->addr_list==NULL);
 321         BUG_TRAP(idev->mc_list==NULL);
 322 #ifdef NET_REFCNT_DEBUG
 323         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 324 #endif
 325         dev_put(dev);
 326         if (!idev->dead) {
 327                 printk("Freeing alive inet6 device %p\n", idev);
 328                 return;
 329         }
 330         snmp6_free_dev(idev);
 331         kfree(idev);
 332 }
 333
 334 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 335 {
 336         struct inet6_dev *ndev;
 337
 338         ASSERT_RTNL();
 339
 340         if (dev->mtu < IPV6_MIN_MTU)
 341                 return NULL;
 342
 343         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 344
 345         if (ndev == NULL)
 346                 return NULL;
 347
 348         rwlock_init(&ndev->lock);
 349         ndev->dev = dev;
 350         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 351         ndev->cnf.mtu6 = dev->mtu;
 352         ndev->cnf.sysctl = NULL;
 353         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 354         if (ndev->nd_parms == NULL) {
 355                 kfree(ndev);
 356                 return NULL;
 357         }
 358         /* We refer to the device */
 359         dev_hold(dev);
 360
 361         if (snmp6_alloc_dev(ndev) < 0) {
 362                 ADBG((KERN_WARNING
 363                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 364                         __FUNCTION__, dev->name));
 365                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 366                 ndev->dead = 1;
 367                 in6_dev_finish_destroy(ndev);
 368                 return NULL;
 369         }
 370
 371         if (snmp6_register_dev(ndev) < 0) {
 372                 ADBG((KERN_WARNING
 373                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 374                         __FUNCTION__, dev->name));
 375                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 376                 ndev->dead = 1;
 377                 in6_dev_finish_destroy(ndev);
 378                 return NULL;
 379         }
 380
 381         /* One reference from device.  We must do this before
 382          * we invoke __ipv6_regen_rndid().
 383          */
 384         in6_dev_hold(ndev);
 385
 386 #ifdef CONFIG_IPV6_PRIVACY
 387         init_timer(&ndev->regen_timer);
 388         ndev->regen_timer.function = ipv6_regen_rndid;
 389         ndev->regen_timer.data = (unsigned long) ndev;
 390         if ((dev->flags&IFF_LOOPBACK) ||
 391             dev->type == ARPHRD_TUNNEL ||
 392             dev->type == ARPHRD_NONE ||
 393             dev->type == ARPHRD_SIT) {
 394                 printk(KERN_INFO
 395                        "%s: Disabled Privacy Extensions\n",
 396                        dev->name);
 397                 ndev->cnf.use_tempaddr = -1;
 398         } else {
 399                 in6_dev_hold(ndev);
 400                 ipv6_regen_rndid((unsigned long) ndev);
 401         }
 402 #endif
 403
 404         if (netif_carrier_ok(dev))
 405                 ndev->if_flags |= IF_READY;
 406
 407         write_lock_bh(&addrconf_lock);
 408         dev->ip6_ptr = ndev;
 409         write_unlock_bh(&addrconf_lock);
 410
 411         ipv6_mc_init_dev(ndev);
 412         ndev->tstamp = jiffies;
 413 #ifdef CONFIG_SYSCTL
 414         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 415                               NET_IPV6_NEIGH, "ipv6",
 416                               &ndisc_ifinfo_sysctl_change,
 417                               NULL);
 418         addrconf_sysctl_register(ndev, &ndev->cnf);
 419 #endif
 420         return ndev;
 421 }
 422
 423 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 424 {
 425         struct inet6_dev *idev;
 426
 427         ASSERT_RTNL();
 428
 429         if ((idev = __in6_dev_get(dev)) == NULL) {
 430                 if ((idev = ipv6_add_dev(dev)) == NULL)
 431                         return NULL;
 432         }
 433
 434         if (dev->flags&IFF_UP)
 435                 ipv6_mc_up(idev);
 436         return idev;
 437 }
 438
 439 #ifdef CONFIG_SYSCTL
 440 static void dev_forward_change(struct inet6_dev *idev)
 441 {
 442         struct net_device *dev;
 443         struct inet6_ifaddr *ifa;
 444         struct in6_addr addr;
 445
 446         if (!idev)
 447                 return;
 448         dev = idev->dev;
 449         if (dev && (dev->flags & IFF_MULTICAST)) {
 450                 ipv6_addr_all_routers(&addr);
 451
 452                 if (idev->cnf.forwarding)
 453                         ipv6_dev_mc_inc(dev, &addr);
 454                 else
 455                         ipv6_dev_mc_dec(dev, &addr);
 456         }
 457         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 458                 if (idev->cnf.forwarding)
 459                         addrconf_join_anycast(ifa);
 460                 else
 461                         addrconf_leave_anycast(ifa);
 462         }
 463 }
 464
 465
 466 static void addrconf_forward_change(void)
 467 {
 468         struct net_device *dev;
 469         struct inet6_dev *idev;
 470
 471         read_lock(&dev_base_lock);
 472         for (dev=dev_base; dev; dev=dev->next) {
 473                 read_lock(&addrconf_lock);
 474                 idev = __in6_dev_get(dev);
 475                 if (idev) {
 476                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 477                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 478                         if (changed)
 479                                 dev_forward_change(idev);
 480                 }
 481                 read_unlock(&addrconf_lock);
 482         }
 483         read_unlock(&dev_base_lock);
 484 }
 485 #endif
 486
 487 /* Nobody refers to this ifaddr, destroy it */
 488
 489 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 490 {
 491         BUG_TRAP(ifp->if_next==NULL);
 492         BUG_TRAP(ifp->lst_next==NULL);
 493 #ifdef NET_REFCNT_DEBUG
 494         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 495 #endif
 496
 497         in6_dev_put(ifp->idev);
 498
 499         if (del_timer(&ifp->timer))
 500                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 501
 502         if (!ifp->dead) {
 503                 printk("Freeing alive inet6 address %p\n", ifp);
 504                 return;
 505         }
 506         dst_release(&ifp->rt->u.dst);
 507
 508         kfree(ifp);
 509 }
 510
 511 /* On success it returns ifp with increased reference count */
 512
 513 static struct inet6_ifaddr *
 514 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 515               int scope, u32 flags)
 516 {
 517         struct inet6_ifaddr *ifa = NULL;
 518         struct rt6_info *rt;
 519         int hash;
 520         int err = 0;
 521
 522         read_lock_bh(&addrconf_lock);
 523         if (idev->dead) {
 524                 err = -ENODEV;                  /*XXX*/
 525                 goto out2;
 526         }
 527
 528         write_lock(&addrconf_hash_lock);
 529
 530         /* Ignore adding duplicate addresses on an interface */
 531         if (ipv6_chk_same_addr(addr, idev->dev)) {
 532                 ADBG(("ipv6_add_addr: already assigned\n"));
 533                 err = -EEXIST;
 534                 goto out;
 535         }
 536
 537         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 538
 539         if (ifa == NULL) {
 540                 ADBG(("ipv6_add_addr: malloc failed\n"));
 541                 err = -ENOBUFS;
 542                 goto out;
 543         }
 544
 545         rt = addrconf_dst_alloc(idev, addr, 0);
 546         if (IS_ERR(rt)) {
 547                 err = PTR_ERR(rt);
 548                 goto out;
 549         }
 550
 551         ipv6_addr_copy(&ifa->addr, addr);
 552
 553         spin_lock_init(&ifa->lock);
 554         init_timer(&ifa->timer);
 555         ifa->timer.data = (unsigned long) ifa;
 556         ifa->scope = scope;
 557         ifa->prefix_len = pfxlen;
 558         ifa->flags = flags | IFA_F_TENTATIVE;
 559         ifa->cstamp = ifa->tstamp = jiffies;
 560
 561         ifa->idev = idev;
 562         in6_dev_hold(idev);
 563         /* For caller */
 564         in6_ifa_hold(ifa);
 565
 566         /* Add to big hash table */
 567         hash = ipv6_addr_hash(addr);
 568
 569         ifa->lst_next = inet6_addr_lst[hash];
 570         inet6_addr_lst[hash] = ifa;
 571         in6_ifa_hold(ifa);
 572         write_unlock(&addrconf_hash_lock);
 573
 574         write_lock(&idev->lock);
 575         /* Add to inet6_dev unicast addr list. */
 576         ifa->if_next = idev->addr_list;
 577         idev->addr_list = ifa;
 578
 579 #ifdef CONFIG_IPV6_PRIVACY
 580         if (ifa->flags&IFA_F_TEMPORARY) {
 581                 ifa->tmp_next = idev->tempaddr_list;
 582                 idev->tempaddr_list = ifa;
 583                 in6_ifa_hold(ifa);
 584         }
 585 #endif
 586
 587         ifa->rt = rt;
 588
 589         in6_ifa_hold(ifa);
 590         write_unlock(&idev->lock);
 591 out2:
 592         read_unlock_bh(&addrconf_lock);
 593
 594         if (likely(err == 0))
 595                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 596         else {
 597                 kfree(ifa);
 598                 ifa = ERR_PTR(err);
 599         }
 600
 601         return ifa;
 602 out:
 603         write_unlock(&addrconf_hash_lock);
 604         goto out2;
 605 }
 606
 607 /* This function wants to get referenced ifp and releases it before return */
 608
 609 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 610 {
 611         struct inet6_ifaddr *ifa, **ifap;
 612         struct inet6_dev *idev = ifp->idev;
 613         int hash;
 614         int deleted = 0, onlink = 0;
 615         unsigned long expires = jiffies;
 616
 617         hash = ipv6_addr_hash(&ifp->addr);
 618
 619         ifp->dead = 1;
 620
 621         write_lock_bh(&addrconf_hash_lock);
 622         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 623              ifap = &ifa->lst_next) {
 624                 if (ifa == ifp) {
 625                         *ifap = ifa->lst_next;
 626                         __in6_ifa_put(ifp);
 627                         ifa->lst_next = NULL;
 628                         break;
 629                 }
 630         }
 631         write_unlock_bh(&addrconf_hash_lock);
 632
 633         write_lock_bh(&idev->lock);
 634 #ifdef CONFIG_IPV6_PRIVACY
 635         if (ifp->flags&IFA_F_TEMPORARY) {
 636                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 637                      ifap = &ifa->tmp_next) {
 638                         if (ifa == ifp) {
 639                                 *ifap = ifa->tmp_next;
 640                                 if (ifp->ifpub) {
 641                                         in6_ifa_put(ifp->ifpub);
 642                                         ifp->ifpub = NULL;
 643                                 }
 644                                 __in6_ifa_put(ifp);
 645                                 ifa->tmp_next = NULL;
 646                                 break;
 647                         }
 648                 }
 649         }
 650 #endif
 651
 652         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 653                 if (ifa == ifp) {
 654                         *ifap = ifa->if_next;
 655                         __in6_ifa_put(ifp);
 656                         ifa->if_next = NULL;
 657                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 658                                 break;
 659                         deleted = 1;
 660                         continue;
 661                 } else if (ifp->flags & IFA_F_PERMANENT) {
 662                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 663                                               ifp->prefix_len)) {
 664                                 if (ifa->flags & IFA_F_PERMANENT) {
 665                                         onlink = 1;
 666                                         if (deleted)
 667                                                 break;
 668                                 } else {
 669                                         unsigned long lifetime;
 670
 671                                         if (!onlink)
 672                                                 onlink = -1;
 673
 674                                         spin_lock(&ifa->lock);
 675                                         lifetime = min_t(unsigned long,
 676                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 677                                         if (time_before(expires,
 678                                                         ifa->tstamp + lifetime * HZ))
 679                                                 expires = ifa->tstamp + lifetime * HZ;
 680                                         spin_unlock(&ifa->lock);
 681                                 }
 682                         }
 683                 }
 684                 ifap = &ifa->if_next;
 685         }
 686         write_unlock_bh(&idev->lock);
 687
 688         ipv6_ifa_notify(RTM_DELADDR, ifp);
 689
 690         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 691
 692         addrconf_del_timer(ifp);
 693
 694         /*
 695          * Purge or update corresponding prefix
 696          *
 697          * 1) we don't purge prefix here if address was not permanent.
 698          *    prefix is managed by its own lifetime.
 699          * 2) if there're no addresses, delete prefix.
 700          * 3) if there're still other permanent address(es),
 701          *    corresponding prefix is still permanent.
 702          * 4) otherwise, update prefix lifetime to the
 703          *    longest valid lifetime among the corresponding
 704          *    addresses on the device.
 705          *    Note: subsequent RA will update lifetime.
 706          *
 707          * --yoshfuji
 708          */
 709         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 710                 struct in6_addr prefix;
 711                 struct rt6_info *rt;
 712
 713                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 714                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 715
 716                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 717                         if (onlink == 0) {
 718                                 ip6_del_rt(rt, NULL, NULL, NULL);
 719                                 rt = NULL;
 720                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 721                                 rt->rt6i_expires = expires;
 722                                 rt->rt6i_flags |= RTF_EXPIRES;
 723                         }
 724                 }
 725                 dst_release(&rt->u.dst);
 726         }
 727
 728         in6_ifa_put(ifp);
 729 }
 730
 731 #ifdef CONFIG_IPV6_PRIVACY
 732 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 733 {
 734         struct inet6_dev *idev = ifp->idev;
 735         struct in6_addr addr, *tmpaddr;
 736         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 737         int tmp_plen;
 738         int ret = 0;
 739         int max_addresses;
 740
 741         write_lock(&idev->lock);
 742         if (ift) {
 743                 spin_lock_bh(&ift->lock);
 744                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 745                 spin_unlock_bh(&ift->lock);
 746                 tmpaddr = &addr;
 747         } else {
 748                 tmpaddr = NULL;
 749         }
 750 retry:
 751         in6_dev_hold(idev);
 752         if (idev->cnf.use_tempaddr <= 0) {
 753                 write_unlock(&idev->lock);
 754                 printk(KERN_INFO
 755                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 756                 in6_dev_put(idev);
 757                 ret = -1;
 758                 goto out;
 759         }
 760         spin_lock_bh(&ifp->lock);
 761         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 762                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 763                 spin_unlock_bh(&ifp->lock);
 764                 write_unlock(&idev->lock);
 765                 printk(KERN_WARNING
 766                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 767                 in6_dev_put(idev);
 768                 ret = -1;
 769                 goto out;
 770         }
 771         in6_ifa_hold(ifp);
 772         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 773         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 774                 spin_unlock_bh(&ifp->lock);
 775                 write_unlock(&idev->lock);
 776                 printk(KERN_WARNING
 777                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 778                 in6_ifa_put(ifp);
 779                 in6_dev_put(idev);
 780                 ret = -1;
 781                 goto out;
 782         }
 783         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 784         tmp_valid_lft = min_t(__u32,
 785                               ifp->valid_lft,
 786                               idev->cnf.temp_valid_lft);
 787         tmp_prefered_lft = min_t(__u32,
 788                                  ifp->prefered_lft,
 789                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 790         tmp_plen = ifp->prefix_len;
 791         max_addresses = idev->cnf.max_addresses;
 792         tmp_cstamp = ifp->cstamp;
 793         tmp_tstamp = ifp->tstamp;
 794         spin_unlock_bh(&ifp->lock);
 795
 796         write_unlock(&idev->lock);
 797         ift = !max_addresses ||
 798               ipv6_count_addresses(idev) < max_addresses ?
 799                 ipv6_add_addr(idev, &addr, tmp_plen,
 800                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 801         if (!ift || IS_ERR(ift)) {
 802                 in6_ifa_put(ifp);
 803                 in6_dev_put(idev);
 804                 printk(KERN_INFO
 805                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 806                 tmpaddr = &addr;
 807                 write_lock(&idev->lock);
 808                 goto retry;
 809         }
 810
 811         spin_lock_bh(&ift->lock);
 812         ift->ifpub = ifp;
 813         ift->valid_lft = tmp_valid_lft;
 814         ift->prefered_lft = tmp_prefered_lft;
 815         ift->cstamp = tmp_cstamp;
 816         ift->tstamp = tmp_tstamp;
 817         spin_unlock_bh(&ift->lock);
 818
 819         addrconf_dad_start(ift, 0);
 820         in6_ifa_put(ift);
 821         in6_dev_put(idev);
 822 out:
 823         return ret;
 824 }
 825 #endif
 826
 827 /*
 828  *      Choose an appropriate source address (RFC3484)
 829  */
 830 struct ipv6_saddr_score {
 831         int             addr_type;
 832         unsigned int    attrs;
 833         int             matchlen;
 834         int             scope;
 835         unsigned int    rule;
 836 };
 837
 838 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 839 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 840 #define IPV6_SADDR_SCORE_HOA            0x0008
 841 #define IPV6_SADDR_SCORE_OIF            0x0010
 842 #define IPV6_SADDR_SCORE_LABEL          0x0020
 843 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 844
 845 static int inline ipv6_saddr_preferred(int type)
 846 {
 847         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 848                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 849                 return 1;
 850         return 0;
 851 }
 852
 853 /* static matching label */
 854 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 855 {
 856  /*
 857   *     prefix (longest match)  label
 858   *     -----------------------------
 859   *     ::1/128                 0
 860   *     ::/0                    1
 861   *     2002::/16               2
 862   *     ::/96                   3
 863   *     ::ffff:0:0/96           4
 864   *     fc00::/7                5
 865   *     2001::/32               6
 866   */
 867         if (type & IPV6_ADDR_LOOPBACK)
 868                 return 0;
 869         else if (type & IPV6_ADDR_COMPATv4)
 870                 return 3;
 871         else if (type & IPV6_ADDR_MAPPED)
 872                 return 4;
 873         else if (addr->s6_addr32[0] == htonl(0x20010000))
 874                 return 6;
 875         else if (addr->s6_addr16[0] == htons(0x2002))
 876                 return 2;
 877         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 878                 return 5;
 879         return 1;
 880 }
 881
 882 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 883                        struct in6_addr *daddr, struct in6_addr *saddr)
 884 {
 885         struct ipv6_saddr_score hiscore;
 886         struct inet6_ifaddr *ifa_result = NULL;
 887         int daddr_type = __ipv6_addr_type(daddr);
 888         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 889         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 890         struct net_device *dev;
 891
 892         memset(&hiscore, 0, sizeof(hiscore));
 893
 894         read_lock(&dev_base_lock);
 895         read_lock(&addrconf_lock);
 896
 897         for (dev = dev_base; dev; dev=dev->next) {
 898                 struct inet6_dev *idev;
 899                 struct inet6_ifaddr *ifa;
 900
 901                 /* Rule 0: Candidate Source Address (section 4)
 902                  *  - multicast and link-local destination address,
 903                  *    the set of candidate source address MUST only
 904                  *    include addresses assigned to interfaces
 905                  *    belonging to the same link as the outgoing
 906                  *    interface.
 907                  * (- For site-local destination addresses, the
 908                  *    set of candidate source addresses MUST only
 909                  *    include addresses assigned to interfaces
 910                  *    belonging to the same site as the outgoing
 911                  *    interface.)
 912                  */
 913                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 914                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 915                     daddr_dev && dev != daddr_dev)
 916                         continue;
 917
 918                 idev = __in6_dev_get(dev);
 919                 if (!idev)
 920                         continue;
 921
 922                 read_lock_bh(&idev->lock);
 923                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 924                         struct ipv6_saddr_score score;
 925
 926                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 927
 928                         /* Rule 0:
 929                          * - Tentative Address (RFC2462 section 5.4)
 930                          *  - A tentative address is not considered
 931                          *    "assigned to an interface" in the traditional
 932                          *    sense.
 933                          * - Candidate Source Address (section 4)
 934                          *  - In any case, anycast addresses, multicast
 935                          *    addresses, and the unspecified address MUST
 936                          *    NOT be included in a candidate set.
 937                          */
 938                         if (ifa->flags & IFA_F_TENTATIVE)
 939                                 continue;
 940                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 941                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 942                                 LIMIT_NETDEBUG(KERN_DEBUG
 943                                                "ADDRCONF: unspecified / multicast address"
 944                                                "assigned as unicast address on %s",
 945                                                dev->name);
 946                                 continue;
 947                         }
 948
 949                         score.attrs = 0;
 950                         score.matchlen = 0;
 951                         score.scope = 0;
 952                         score.rule = 0;
 953
 954                         if (ifa_result == NULL) {
 955                                 /* record it if the first available entry */
 956                                 goto record_it;
 957                         }
 958
 959                         /* Rule 1: Prefer same address */
 960                         if (hiscore.rule < 1) {
 961                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 962                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 963                                 hiscore.rule++;
 964                         }
 965                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 966                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 967                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 968                                         score.rule = 1;
 969                                         goto record_it;
 970                                 }
 971                         } else {
 972                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 973                                         continue;
 974                         }
 975
 976                         /* Rule 2: Prefer appropriate scope */
 977                         if (hiscore.rule < 2) {
 978                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 979                                 hiscore.rule++;
 980                         }
 981                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 982                         if (hiscore.scope < score.scope) {
 983                                 if (hiscore.scope < daddr_scope) {
 984                                         score.rule = 2;
 985                                         goto record_it;
 986                                 } else
 987                                         continue;
 988                         } else if (score.scope < hiscore.scope) {
 989                                 if (score.scope < daddr_scope)
 990                                         continue;
 991                                 else {
 992                                         score.rule = 2;
 993                                         goto record_it;
 994                                 }
 995                         }
 996
 997                         /* Rule 3: Avoid deprecated address */
 998                         if (hiscore.rule < 3) {
 999                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1000                                     !(ifa_result->flags & IFA_F_DEPRECATED))
1001                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1002                                 hiscore.rule++;
1003                         }
1004                         if (ipv6_saddr_preferred(score.addr_type) ||
1005                             !(ifa->flags & IFA_F_DEPRECATED)) {
1006                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1007                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1008                                         score.rule = 3;
1009                                         goto record_it;
1010                                 }
1011                         } else {
1012                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1013                                         continue;
1014                         }
1015
1016                         /* Rule 4: Prefer home address -- not implemented yet */
1017                         if (hiscore.rule < 4)
1018                                 hiscore.rule++;
1019
1020                         /* Rule 5: Prefer outgoing interface */
1021                         if (hiscore.rule < 5) {
1022                                 if (daddr_dev == NULL ||
1023                                     daddr_dev == ifa_result->idev->dev)
1024                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1025                                 hiscore.rule++;
1026                         }
1027                         if (daddr_dev == NULL ||
1028                             daddr_dev == ifa->idev->dev) {
1029                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1030                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1031                                         score.rule = 5;
1032                                         goto record_it;
1033                                 }
1034                         } else {
1035                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1036                                         continue;
1037                         }
1038
1039                         /* Rule 6: Prefer matching label */
1040                         if (hiscore.rule < 6) {
1041                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1042                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1043                                 hiscore.rule++;
1044                         }
1045                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1046                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1047                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1048                                         score.rule = 6;
1049                                         goto record_it;
1050                                 }
1051                         } else {
1052                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1053                                         continue;
1054                         }
1055
1056 #ifdef CONFIG_IPV6_PRIVACY
1057                         /* Rule 7: Prefer public address
1058                          * Note: prefer temprary address if use_tempaddr >= 2
1059                          */
1060                         if (hiscore.rule < 7) {
1061                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1062                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1063                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1064                                 hiscore.rule++;
1065                         }
1066                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1067                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1068                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1069                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1070                                         score.rule = 7;
1071                                         goto record_it;
1072                                 }
1073                         } else {
1074                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1075                                         continue;
1076                         }
1077 #else
1078                         if (hiscore.rule < 7)
1079                                 hiscore.rule++;
1080 #endif
1081                         /* Rule 8: Use longest matching prefix */
1082                         if (hiscore.rule < 8) {
1083                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1084                                 hiscore.rule++;
1085                         }
1086                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1087                         if (score.matchlen > hiscore.matchlen) {
1088                                 score.rule = 8;
1089                                 goto record_it;
1090                         }
1091 #if 0
1092                         else if (score.matchlen < hiscore.matchlen)
1093                                 continue;
1094 #endif
1095
1096                         /* Final Rule: choose first available one */
1097                         continue;
1098 record_it:
1099                         if (ifa_result)
1100                                 in6_ifa_put(ifa_result);
1101                         in6_ifa_hold(ifa);
1102                         ifa_result = ifa;
1103                         hiscore = score;
1104                 }
1105                 read_unlock_bh(&idev->lock);
1106         }
1107         read_unlock(&addrconf_lock);
1108         read_unlock(&dev_base_lock);
1109
1110         if (!ifa_result)
1111                 return -EADDRNOTAVAIL;
1112
1113         ipv6_addr_copy(saddr, &ifa_result->addr);
1114         in6_ifa_put(ifa_result);
1115         return 0;
1116 }
1117
1118
1119 int ipv6_get_saddr(struct dst_entry *dst,
1120                    struct in6_addr *daddr, struct in6_addr *saddr)
1121 {
1122         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1123 }
1124
1125
1126 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1127 {
1128         struct inet6_dev *idev;
1129         int err = -EADDRNOTAVAIL;
1130
1131         read_lock(&addrconf_lock);
1132         if ((idev = __in6_dev_get(dev)) != NULL) {
1133                 struct inet6_ifaddr *ifp;
1134
1135                 read_lock_bh(&idev->lock);
1136                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1137                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1138                                 ipv6_addr_copy(addr, &ifp->addr);
1139                                 err = 0;
1140                                 break;
1141                         }
1142                 }
1143                 read_unlock_bh(&idev->lock);
1144         }
1145         read_unlock(&addrconf_lock);
1146         return err;
1147 }
1148
1149 static int ipv6_count_addresses(struct inet6_dev *idev)
1150 {
1151         int cnt = 0;
1152         struct inet6_ifaddr *ifp;
1153
1154         read_lock_bh(&idev->lock);
1155         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1156                 cnt++;
1157         read_unlock_bh(&idev->lock);
1158         return cnt;
1159 }
1160
1161 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1162 {
1163         struct inet6_ifaddr * ifp;
1164         u8 hash = ipv6_addr_hash(addr);
1165
1166         read_lock_bh(&addrconf_hash_lock);
1167         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1168                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1169                     !(ifp->flags&IFA_F_TENTATIVE)) {
1170                         if (dev == NULL || ifp->idev->dev == dev ||
1171                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1172                                 break;
1173                 }
1174         }
1175         read_unlock_bh(&addrconf_hash_lock);
1176         return ifp != NULL;
1177 }
1178
1179 static
1180 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1181 {
1182         struct inet6_ifaddr * ifp;
1183         u8 hash = ipv6_addr_hash(addr);
1184
1185         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1186                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1187                         if (dev == NULL || ifp->idev->dev == dev)
1188                                 break;
1189                 }
1190         }
1191         return ifp != NULL;
1192 }
1193
1194 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1195 {
1196         struct inet6_ifaddr * ifp;
1197         u8 hash = ipv6_addr_hash(addr);
1198
1199         read_lock_bh(&addrconf_hash_lock);
1200         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1201                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1202                         if (dev == NULL || ifp->idev->dev == dev ||
1203                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1204                                 in6_ifa_hold(ifp);
1205                                 break;
1206                         }
1207                 }
1208         }
1209         read_unlock_bh(&addrconf_hash_lock);
1210
1211         return ifp;
1212 }
1213
1214 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1215 {
1216         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1217         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1218         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1219         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1220         int sk_ipv6only = ipv6_only_sock(sk);
1221         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1222         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1223         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1224
1225         if (!sk2_rcv_saddr && !sk_ipv6only)
1226                 return 1;
1227
1228         if (addr_type2 == IPV6_ADDR_ANY &&
1229             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1230                 return 1;
1231
1232         if (addr_type == IPV6_ADDR_ANY &&
1233             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1234                 return 1;
1235
1236         if (sk2_rcv_saddr6 &&
1237             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1238                 return 1;
1239
1240         if (addr_type == IPV6_ADDR_MAPPED &&
1241             !sk2_ipv6only &&
1242             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1243                 return 1;
1244
1245         return 0;
1246 }
1247
1248 /* Gets referenced address, destroys ifaddr */
1249
1250 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1251 {
1252         if (ifp->flags&IFA_F_PERMANENT) {
1253                 spin_lock_bh(&ifp->lock);
1254                 addrconf_del_timer(ifp);
1255                 ifp->flags |= IFA_F_TENTATIVE;
1256                 spin_unlock_bh(&ifp->lock);
1257                 in6_ifa_put(ifp);
1258 #ifdef CONFIG_IPV6_PRIVACY
1259         } else if (ifp->flags&IFA_F_TEMPORARY) {
1260                 struct inet6_ifaddr *ifpub;
1261                 spin_lock_bh(&ifp->lock);
1262                 ifpub = ifp->ifpub;
1263                 if (ifpub) {
1264                         in6_ifa_hold(ifpub);
1265                         spin_unlock_bh(&ifp->lock);
1266                         ipv6_create_tempaddr(ifpub, ifp);
1267                         in6_ifa_put(ifpub);
1268                 } else {
1269                         spin_unlock_bh(&ifp->lock);
1270                 }
1271                 ipv6_del_addr(ifp);
1272 #endif
1273         } else
1274                 ipv6_del_addr(ifp);
1275 }
1276
1277 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1278 {
1279         if (net_ratelimit())
1280                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1281         addrconf_dad_stop(ifp);
1282 }
1283
1284 /* Join to solicited addr multicast group. */
1285
1286 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1287 {
1288         struct in6_addr maddr;
1289
1290         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1291                 return;
1292
1293         addrconf_addr_solict_mult(addr, &maddr);
1294         ipv6_dev_mc_inc(dev, &maddr);
1295 }
1296
1297 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1298 {
1299         struct in6_addr maddr;
1300
1301         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1302                 return;
1303
1304         addrconf_addr_solict_mult(addr, &maddr);
1305         __ipv6_dev_mc_dec(idev, &maddr);
1306 }
1307
1308 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1309 {
1310         struct in6_addr addr;
1311         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1312         if (ipv6_addr_any(&addr))
1313                 return;
1314         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1315 }
1316
1317 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1318 {
1319         struct in6_addr addr;
1320         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1321         if (ipv6_addr_any(&addr))
1322                 return;
1323         __ipv6_dev_ac_dec(ifp->idev, &addr);
1324 }
1325
1326 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1327 {
1328         if (dev->addr_len != ETH_ALEN)
1329                 return -1;
1330         memcpy(eui, dev->dev_addr, 3);
1331         memcpy(eui + 5, dev->dev_addr + 3, 3);
1332
1333         /*
1334          * The zSeries OSA network cards can be shared among various
1335          * OS instances, but the OSA cards have only one MAC address.
1336          * This leads to duplicate address conflicts in conjunction
1337          * with IPv6 if more than one instance uses the same card.
1338          *
1339          * The driver for these cards can deliver a unique 16-bit
1340          * identifier for each instance sharing the same card.  It is
1341          * placed instead of 0xFFFE in the interface identifier.  The
1342          * "u" bit of the interface identifier is not inverted in this
1343          * case.  Hence the resulting interface identifier has local
1344          * scope according to RFC2373.
1345          */
1346         if (dev->dev_id) {
1347                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1348                 eui[4] = dev->dev_id & 0xFF;
1349         } else {
1350                 eui[3] = 0xFF;
1351                 eui[4] = 0xFE;
1352                 eui[0] ^= 2;
1353         }
1354         return 0;
1355 }
1356
1357 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1358 {
1359         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1360         if (dev->addr_len != ARCNET_ALEN)
1361                 return -1;
1362         memset(eui, 0, 7);
1363         eui[7] = *(u8*)dev->dev_addr;
1364         return 0;
1365 }
1366
1367 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1368 {
1369         if (dev->addr_len != INFINIBAND_ALEN)
1370                 return -1;
1371         memcpy(eui, dev->dev_addr + 12, 8);
1372         eui[0] |= 2;
1373         return 0;
1374 }
1375
1376 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1377 {
1378         switch (dev->type) {
1379         case ARPHRD_ETHER:
1380         case ARPHRD_FDDI:
1381         case ARPHRD_IEEE802_TR:
1382                 return addrconf_ifid_eui48(eui, dev);
1383         case ARPHRD_ARCNET:
1384                 return addrconf_ifid_arcnet(eui, dev);
1385         case ARPHRD_INFINIBAND:
1386                 return addrconf_ifid_infiniband(eui, dev);
1387         }
1388         return -1;
1389 }
1390
1391 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1392 {
1393         int err = -1;
1394         struct inet6_ifaddr *ifp;
1395
1396         read_lock_bh(&idev->lock);
1397         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1398                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1399                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1400                         err = 0;
1401                         break;
1402                 }
1403         }
1404         read_unlock_bh(&idev->lock);
1405         return err;
1406 }
1407
1408 #ifdef CONFIG_IPV6_PRIVACY
1409 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1410 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1411 {
1412 regen:
1413         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1414         idev->rndid[0] &= ~0x02;
1415
1416         /*
1417          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1418          * check if generated address is not inappropriate
1419          *
1420          *  - Reserved subnet anycast (RFC 2526)
1421          *      11111101 11....11 1xxxxxxx
1422          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1423          *      00-00-5E-FE-xx-xx-xx-xx
1424          *  - value 0
1425          *  - XXX: already assigned to an address on the device
1426          */
1427         if (idev->rndid[0] == 0xfd &&
1428             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1429             (idev->rndid[7]&0x80))
1430                 goto regen;
1431         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1432                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1433                         goto regen;
1434                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1435                         goto regen;
1436         }
1437
1438         return 0;
1439 }
1440
1441 static void ipv6_regen_rndid(unsigned long data)
1442 {
1443         struct inet6_dev *idev = (struct inet6_dev *) data;
1444         unsigned long expires;
1445
1446         read_lock_bh(&addrconf_lock);
1447         write_lock_bh(&idev->lock);
1448
1449         if (idev->dead)
1450                 goto out;
1451
1452         if (__ipv6_regen_rndid(idev) < 0)
1453                 goto out;
1454
1455         expires = jiffies +
1456                 idev->cnf.temp_prefered_lft * HZ -
1457                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1458         if (time_before(expires, jiffies)) {
1459                 printk(KERN_WARNING
1460                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1461                         idev->dev->name);
1462                 goto out;
1463         }
1464
1465         if (!mod_timer(&idev->regen_timer, expires))
1466                 in6_dev_hold(idev);
1467
1468 out:
1469         write_unlock_bh(&idev->lock);
1470         read_unlock_bh(&addrconf_lock);
1471         in6_dev_put(idev);
1472 }
1473
1474 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1475         int ret = 0;
1476
1477         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1478                 ret = __ipv6_regen_rndid(idev);
1479         return ret;
1480 }
1481 #endif
1482
1483 /*
1484  *      Add prefix route.
1485  */
1486
1487 static void
1488 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1489                       unsigned long expires, u32 flags)
1490 {
1491         struct in6_rtmsg rtmsg;
1492
1493         memset(&rtmsg, 0, sizeof(rtmsg));
1494         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1495         rtmsg.rtmsg_dst_len = plen;
1496         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1497         rtmsg.rtmsg_ifindex = dev->ifindex;
1498         rtmsg.rtmsg_info = expires;
1499         rtmsg.rtmsg_flags = RTF_UP|flags;
1500         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1501
1502         /* Prevent useless cloning on PtP SIT.
1503            This thing is done here expecting that the whole
1504            class of non-broadcast devices need not cloning.
1505          */
1506         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1507                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1508
1509         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1510 }
1511
1512 /* Create "default" multicast route to the interface */
1513
1514 static void addrconf_add_mroute(struct net_device *dev)
1515 {
1516         struct in6_rtmsg rtmsg;
1517
1518         memset(&rtmsg, 0, sizeof(rtmsg));
1519         ipv6_addr_set(&rtmsg.rtmsg_dst,
1520                       htonl(0xFF000000), 0, 0, 0);
1521         rtmsg.rtmsg_dst_len = 8;
1522         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1523         rtmsg.rtmsg_ifindex = dev->ifindex;
1524         rtmsg.rtmsg_flags = RTF_UP;
1525         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1526         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1527 }
1528
1529 static void sit_route_add(struct net_device *dev)
1530 {
1531         struct in6_rtmsg rtmsg;
1532
1533         memset(&rtmsg, 0, sizeof(rtmsg));
1534
1535         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1536         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1537
1538         /* prefix length - 96 bits "::d.d.d.d" */
1539         rtmsg.rtmsg_dst_len     = 96;
1540         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1541         rtmsg.rtmsg_ifindex     = dev->ifindex;
1542
1543         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1544 }
1545
1546 static void addrconf_add_lroute(struct net_device *dev)
1547 {
1548         struct in6_addr addr;
1549
1550         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1551         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1552 }
1553
1554 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1555 {
1556         struct inet6_dev *idev;
1557
1558         ASSERT_RTNL();
1559
1560         if ((idev = ipv6_find_idev(dev)) == NULL)
1561                 return NULL;
1562
1563         /* Add default multicast route */
1564         addrconf_add_mroute(dev);
1565
1566         /* Add link local route */
1567         addrconf_add_lroute(dev);
1568         return idev;
1569 }
1570
1571 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1572 {
1573         struct prefix_info *pinfo;
1574         __u32 valid_lft;
1575         __u32 prefered_lft;
1576         int addr_type;
1577         unsigned long rt_expires;
1578         struct inet6_dev *in6_dev;
1579
1580         pinfo = (struct prefix_info *) opt;
1581
1582         if (len < sizeof(struct prefix_info)) {
1583                 ADBG(("addrconf: prefix option too short\n"));
1584                 return;
1585         }
1586
1587         /*
1588          *      Validation checks ([ADDRCONF], page 19)
1589          */
1590
1591         addr_type = ipv6_addr_type(&pinfo->prefix);
1592
1593         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1594                 return;
1595
1596         valid_lft = ntohl(pinfo->valid);
1597         prefered_lft = ntohl(pinfo->prefered);
1598
1599         if (prefered_lft > valid_lft) {
1600                 if (net_ratelimit())
1601                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1602                 return;
1603         }
1604
1605         in6_dev = in6_dev_get(dev);
1606
1607         if (in6_dev == NULL) {
1608                 if (net_ratelimit())
1609                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1610                 return;
1611         }
1612
1613         /*
1614          *      Two things going on here:
1615          *      1) Add routes for on-link prefixes
1616          *      2) Configure prefixes with the auto flag set
1617          */
1618
1619         /* Avoid arithmetic overflow. Really, we could
1620            save rt_expires in seconds, likely valid_lft,
1621            but it would require division in fib gc, that it
1622            not good.
1623          */
1624         if (valid_lft >= 0x7FFFFFFF/HZ)
1625                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1626         else
1627                 rt_expires = valid_lft * HZ;
1628
1629         /*
1630          * We convert this (in jiffies) to clock_t later.
1631          * Avoid arithmetic overflow there as well.
1632          * Overflow can happen only if HZ < USER_HZ.
1633          */
1634         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1635                 rt_expires = 0x7FFFFFFF / USER_HZ;
1636
1637         if (pinfo->onlink) {
1638                 struct rt6_info *rt;
1639                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1640
1641                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1642                         if (rt->rt6i_flags&RTF_EXPIRES) {
1643                                 if (valid_lft == 0) {
1644                                         ip6_del_rt(rt, NULL, NULL, NULL);
1645                                         rt = NULL;
1646                                 } else {
1647                                         rt->rt6i_expires = jiffies + rt_expires;
1648                                 }
1649                         }
1650                 } else if (valid_lft) {
1651                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1652                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1653                 }
1654                 if (rt)
1655                         dst_release(&rt->u.dst);
1656         }
1657
1658         /* Try to figure out our local address for this prefix */
1659
1660         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1661                 struct inet6_ifaddr * ifp;
1662                 struct in6_addr addr;
1663                 int create = 0, update_lft = 0;
1664
1665                 if (pinfo->prefix_len == 64) {
1666                         memcpy(&addr, &pinfo->prefix, 8);
1667                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1668                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1669                                 in6_dev_put(in6_dev);
1670                                 return;
1671                         }
1672                         goto ok;
1673                 }
1674                 if (net_ratelimit())
1675                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1676                                pinfo->prefix_len);
1677                 in6_dev_put(in6_dev);
1678                 return;
1679
1680 ok:
1681
1682                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1683
1684                 if (ifp == NULL && valid_lft) {
1685                         int max_addresses = in6_dev->cnf.max_addresses;
1686
1687                         /* Do not allow to create too much of autoconfigured
1688                          * addresses; this would be too easy way to crash kernel.
1689                          */
1690                         if (!max_addresses ||
1691                             ipv6_count_addresses(in6_dev) < max_addresses)
1692                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1693                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1694
1695                         if (!ifp || IS_ERR(ifp)) {
1696                                 in6_dev_put(in6_dev);
1697                                 return;
1698                         }
1699
1700                         update_lft = create = 1;
1701                         ifp->cstamp = jiffies;
1702                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1703                 }
1704
1705                 if (ifp) {
1706                         int flags;
1707                         unsigned long now;
1708 #ifdef CONFIG_IPV6_PRIVACY
1709                         struct inet6_ifaddr *ift;
1710 #endif
1711                         u32 stored_lft;
1712
1713                         /* update lifetime (RFC2462 5.5.3 e) */
1714                         spin_lock(&ifp->lock);
1715                         now = jiffies;
1716                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1717                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1718                         else
1719                                 stored_lft = 0;
1720                         if (!update_lft && stored_lft) {
1721                                 if (valid_lft > MIN_VALID_LIFETIME ||
1722                                     valid_lft > stored_lft)
1723                                         update_lft = 1;
1724                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1725                                         /* valid_lft <= stored_lft is always true */
1726                                         /* XXX: IPsec */
1727                                         update_lft = 0;
1728                                 } else {
1729                                         valid_lft = MIN_VALID_LIFETIME;
1730                                         if (valid_lft < prefered_lft)
1731                                                 prefered_lft = valid_lft;
1732                                         update_lft = 1;
1733                                 }
1734                         }
1735
1736                         if (update_lft) {
1737                                 ifp->valid_lft = valid_lft;
1738                                 ifp->prefered_lft = prefered_lft;
1739                                 ifp->tstamp = now;
1740                                 flags = ifp->flags;
1741                                 ifp->flags &= ~IFA_F_DEPRECATED;
1742                                 spin_unlock(&ifp->lock);
1743
1744                                 if (!(flags&IFA_F_TENTATIVE))
1745                                         ipv6_ifa_notify(0, ifp);
1746                         } else
1747                                 spin_unlock(&ifp->lock);
1748
1749 #ifdef CONFIG_IPV6_PRIVACY
1750                         read_lock_bh(&in6_dev->lock);
1751                         /* update all temporary addresses in the list */
1752                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1753                                 /*
1754                                  * When adjusting the lifetimes of an existing
1755                                  * temporary address, only lower the lifetimes.
1756                                  * Implementations must not increase the
1757                                  * lifetimes of an existing temporary address
1758                                  * when processing a Prefix Information Option.
1759                                  */
1760                                 spin_lock(&ift->lock);
1761                                 flags = ift->flags;
1762                                 if (ift->valid_lft > valid_lft &&
1763                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1764                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1765                                 if (ift->prefered_lft > prefered_lft &&
1766                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1767                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1768                                 spin_unlock(&ift->lock);
1769                                 if (!(flags&IFA_F_TENTATIVE))
1770                                         ipv6_ifa_notify(0, ift);
1771                         }
1772
1773                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1774                                 /*
1775                                  * When a new public address is created as described in [ADDRCONF],
1776                                  * also create a new temporary address.
1777                                  */
1778                                 read_unlock_bh(&in6_dev->lock);
1779                                 ipv6_create_tempaddr(ifp, NULL);
1780                         } else {
1781                                 read_unlock_bh(&in6_dev->lock);
1782                         }
1783 #endif
1784                         in6_ifa_put(ifp);
1785                         addrconf_verify(0);
1786                 }
1787         }
1788         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1789         in6_dev_put(in6_dev);
1790 }
1791
1792 /*
1793  *      Set destination address.
1794  *      Special case for SIT interfaces where we create a new "virtual"
1795  *      device.
1796  */
1797 int addrconf_set_dstaddr(void __user *arg)
1798 {
1799         struct in6_ifreq ireq;
1800         struct net_device *dev;
1801         int err = -EINVAL;
1802
1803         rtnl_lock();
1804
1805         err = -EFAULT;
1806         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1807                 goto err_exit;
1808
1809         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1810
1811         err = -ENODEV;
1812         if (dev == NULL)
1813                 goto err_exit;
1814
1815         if (dev->type == ARPHRD_SIT) {
1816                 struct ifreq ifr;
1817                 mm_segment_t    oldfs;
1818                 struct ip_tunnel_parm p;
1819
1820                 err = -EADDRNOTAVAIL;
1821                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1822                         goto err_exit;
1823
1824                 memset(&p, 0, sizeof(p));
1825                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1826                 p.iph.saddr = 0;
1827                 p.iph.version = 4;
1828                 p.iph.ihl = 5;
1829                 p.iph.protocol = IPPROTO_IPV6;
1830                 p.iph.ttl = 64;
1831                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1832
1833                 oldfs = get_fs(); set_fs(KERNEL_DS);
1834                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1835                 set_fs(oldfs);
1836
1837                 if (err == 0) {
1838                         err = -ENOBUFS;
1839                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1840                                 goto err_exit;
1841                         err = dev_open(dev);
1842                 }
1843         }
1844
1845 err_exit:
1846         rtnl_unlock();
1847         return err;
1848 }
1849
1850 /*
1851  *      Manual configuration of address on an interface
1852  */
1853 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1854 {
1855         struct inet6_ifaddr *ifp;
1856         struct inet6_dev *idev;
1857         struct net_device *dev;
1858         int scope;
1859
1860         ASSERT_RTNL();
1861
1862         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1863                 return -ENODEV;
1864
1865         if (!(dev->flags&IFF_UP))
1866                 return -ENETDOWN;
1867
1868         if ((idev = addrconf_add_dev(dev)) == NULL)
1869                 return -ENOBUFS;
1870
1871         scope = ipv6_addr_scope(pfx);
1872
1873         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1874         if (!IS_ERR(ifp)) {
1875                 addrconf_dad_start(ifp, 0);
1876                 in6_ifa_put(ifp);
1877                 return 0;
1878         }
1879
1880         return PTR_ERR(ifp);
1881 }
1882
1883 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1884 {
1885         struct inet6_ifaddr *ifp;
1886         struct inet6_dev *idev;
1887         struct net_device *dev;
1888
1889         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1890                 return -ENODEV;
1891
1892         if ((idev = __in6_dev_get(dev)) == NULL)
1893                 return -ENXIO;
1894
1895         read_lock_bh(&idev->lock);
1896         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1897                 if (ifp->prefix_len == plen &&
1898                     ipv6_addr_equal(pfx, &ifp->addr)) {
1899                         in6_ifa_hold(ifp);
1900                         read_unlock_bh(&idev->lock);
1901
1902                         ipv6_del_addr(ifp);
1903
1904                         /* If the last address is deleted administratively,
1905                            disable IPv6 on this interface.
1906                          */
1907                         if (idev->addr_list == NULL)
1908                                 addrconf_ifdown(idev->dev, 1);
1909                         return 0;
1910                 }
1911         }
1912         read_unlock_bh(&idev->lock);
1913         return -EADDRNOTAVAIL;
1914 }
1915
1916
1917 int addrconf_add_ifaddr(void __user *arg)
1918 {
1919         struct in6_ifreq ireq;
1920         int err;
1921
1922         if (!capable(CAP_NET_ADMIN))
1923                 return -EPERM;
1924
1925         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1926                 return -EFAULT;
1927
1928         rtnl_lock();
1929         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1930         rtnl_unlock();
1931         return err;
1932 }
1933
1934 int addrconf_del_ifaddr(void __user *arg)
1935 {
1936         struct in6_ifreq ireq;
1937         int err;
1938
1939         if (!capable(CAP_NET_ADMIN))
1940                 return -EPERM;
1941
1942         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1943                 return -EFAULT;
1944
1945         rtnl_lock();
1946         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1947         rtnl_unlock();
1948         return err;
1949 }
1950
1951 static void sit_add_v4_addrs(struct inet6_dev *idev)
1952 {
1953         struct inet6_ifaddr * ifp;
1954         struct in6_addr addr;
1955         struct net_device *dev;
1956         int scope;
1957
1958         ASSERT_RTNL();
1959
1960         memset(&addr, 0, sizeof(struct in6_addr));
1961         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1962
1963         if (idev->dev->flags&IFF_POINTOPOINT) {
1964                 addr.s6_addr32[0] = htonl(0xfe800000);
1965                 scope = IFA_LINK;
1966         } else {
1967                 scope = IPV6_ADDR_COMPATv4;
1968         }
1969
1970         if (addr.s6_addr32[3]) {
1971                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1972                 if (!IS_ERR(ifp)) {
1973                         spin_lock_bh(&ifp->lock);
1974                         ifp->flags &= ~IFA_F_TENTATIVE;
1975                         spin_unlock_bh(&ifp->lock);
1976                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1977                         in6_ifa_put(ifp);
1978                 }
1979                 return;
1980         }
1981
1982         for (dev = dev_base; dev != NULL; dev = dev->next) {
1983                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1984                 if (in_dev && (dev->flags & IFF_UP)) {
1985                         struct in_ifaddr * ifa;
1986
1987                         int flag = scope;
1988
1989                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1990                                 int plen;
1991
1992                                 addr.s6_addr32[3] = ifa->ifa_local;
1993
1994                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1995                                         continue;
1996                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1997                                         if (idev->dev->flags&IFF_POINTOPOINT)
1998                                                 continue;
1999                                         flag |= IFA_HOST;
2000                                 }
2001                                 if (idev->dev->flags&IFF_POINTOPOINT)
2002                                         plen = 64;
2003                                 else
2004                                         plen = 96;
2005
2006                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2007                                                     IFA_F_PERMANENT);
2008                                 if (!IS_ERR(ifp)) {
2009                                         spin_lock_bh(&ifp->lock);
2010                                         ifp->flags &= ~IFA_F_TENTATIVE;
2011                                         spin_unlock_bh(&ifp->lock);
2012                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2013                                         in6_ifa_put(ifp);
2014                                 }
2015                         }
2016                 }
2017         }
2018 }
2019
2020 static void init_loopback(struct net_device *dev)
2021 {
2022         struct inet6_dev  *idev;
2023         struct inet6_ifaddr * ifp;
2024
2025         /* ::1 */
2026
2027         ASSERT_RTNL();
2028
2029         if ((idev = ipv6_find_idev(dev)) == NULL) {
2030                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2031                 return;
2032         }
2033
2034         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2035         if (!IS_ERR(ifp)) {
2036                 spin_lock_bh(&ifp->lock);
2037                 ifp->flags &= ~IFA_F_TENTATIVE;
2038                 spin_unlock_bh(&ifp->lock);
2039                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2040                 in6_ifa_put(ifp);
2041         }
2042 }
2043
2044 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2045 {
2046         struct inet6_ifaddr * ifp;
2047
2048         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2049         if (!IS_ERR(ifp)) {
2050                 addrconf_dad_start(ifp, 0);
2051                 in6_ifa_put(ifp);
2052         }
2053 }
2054
2055 static void addrconf_dev_config(struct net_device *dev)
2056 {
2057         struct in6_addr addr;
2058         struct inet6_dev    * idev;
2059
2060         ASSERT_RTNL();
2061
2062         if ((dev->type != ARPHRD_ETHER) &&
2063             (dev->type != ARPHRD_FDDI) &&
2064             (dev->type != ARPHRD_IEEE802_TR) &&
2065             (dev->type != ARPHRD_ARCNET) &&
2066             (dev->type != ARPHRD_INFINIBAND)) {
2067                 /* Alas, we support only Ethernet autoconfiguration. */
2068                 return;
2069         }
2070
2071         idev = addrconf_add_dev(dev);
2072         if (idev == NULL)
2073                 return;
2074
2075         memset(&addr, 0, sizeof(struct in6_addr));
2076         addr.s6_addr32[0] = htonl(0xFE800000);
2077
2078         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2079                 addrconf_add_linklocal(idev, &addr);
2080 }
2081
2082 static void addrconf_sit_config(struct net_device *dev)
2083 {
2084         struct inet6_dev *idev;
2085
2086         ASSERT_RTNL();
2087
2088         /*
2089          * Configure the tunnel with one of our IPv4
2090          * addresses... we should configure all of
2091          * our v4 addrs in the tunnel
2092          */
2093
2094         if ((idev = ipv6_find_idev(dev)) == NULL) {
2095                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2096                 return;
2097         }
2098
2099         sit_add_v4_addrs(idev);
2100
2101         if (dev->flags&IFF_POINTOPOINT) {
2102                 addrconf_add_mroute(dev);
2103                 addrconf_add_lroute(dev);
2104         } else
2105                 sit_route_add(dev);
2106 }
2107
2108 static inline int
2109 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2110 {
2111         struct in6_addr lladdr;
2112
2113         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2114                 addrconf_add_linklocal(idev, &lladdr);
2115                 return 0;
2116         }
2117         return -1;
2118 }
2119
2120 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2121 {
2122         struct net_device *link_dev;
2123
2124         /* first try to inherit the link-local address from the link device */
2125         if (idev->dev->iflink &&
2126             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2127                 if (!ipv6_inherit_linklocal(idev, link_dev))
2128                         return;
2129         }
2130         /* then try to inherit it from any device */
2131         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2132                 if (!ipv6_inherit_linklocal(idev, link_dev))
2133                         return;
2134         }
2135         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2136 }
2137
2138 /*
2139  * Autoconfigure tunnel with a link-local address so routing protocols,
2140  * DHCPv6, MLD etc. can be run over the virtual link
2141  */
2142
2143 static void addrconf_ip6_tnl_config(struct net_device *dev)
2144 {
2145         struct inet6_dev *idev;
2146
2147         ASSERT_RTNL();
2148
2149         if ((idev = addrconf_add_dev(dev)) == NULL) {
2150                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2151                 return;
2152         }
2153         ip6_tnl_add_linklocal(idev);
2154 }
2155
2156 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2157                            void * data)
2158 {
2159         struct net_device *dev = (struct net_device *) data;
2160         struct inet6_dev *idev = __in6_dev_get(dev);
2161         int run_pending = 0;
2162
2163         switch(event) {
2164         case NETDEV_UP:
2165         case NETDEV_CHANGE:
2166                 if (event == NETDEV_UP) {
2167                         if (!netif_carrier_ok(dev)) {
2168                                 /* device is not ready yet. */
2169                                 printk(KERN_INFO
2170                                         "ADDRCONF(NETDEV_UP): %s: "
2171                                         "link is not ready\n",
2172                                         dev->name);
2173                                 break;
2174                         }
2175
2176                         if (idev)
2177                                 idev->if_flags |= IF_READY;
2178                 } else {
2179                         if (!netif_carrier_ok(dev)) {
2180                                 /* device is still not ready. */
2181                                 break;
2182                         }
2183
2184                         if (idev) {
2185                                 if (idev->if_flags & IF_READY) {
2186                                         /* device is already configured. */
2187                                         break;
2188                                 }
2189                                 idev->if_flags |= IF_READY;
2190                         }
2191
2192                         printk(KERN_INFO
2193                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2194                                         "link becomes ready\n",
2195                                         dev->name);
2196
2197                         run_pending = 1;
2198                 }
2199
2200                 switch(dev->type) {
2201                 case ARPHRD_SIT:
2202                         addrconf_sit_config(dev);
2203                         break;
2204                 case ARPHRD_TUNNEL6:
2205                         addrconf_ip6_tnl_config(dev);
2206                         break;
2207                 case ARPHRD_LOOPBACK:
2208                         init_loopback(dev);
2209                         break;
2210
2211                 default:
2212                         addrconf_dev_config(dev);
2213                         break;
2214                 };
2215                 if (idev) {
2216                         if (run_pending)
2217                                 addrconf_dad_run(idev);
2218
2219                         /* If the MTU changed during the interface down, when the
2220                            interface up, the changed MTU must be reflected in the
2221                            idev as well as routers.
2222                          */
2223                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2224                                 rt6_mtu_change(dev, dev->mtu);
2225                                 idev->cnf.mtu6 = dev->mtu;
2226                         }
2227                         idev->tstamp = jiffies;
2228                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2229                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2230                            stop IPv6 on this interface.
2231                          */
2232                         if (dev->mtu < IPV6_MIN_MTU)
2233                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2234                 }
2235                 break;
2236
2237         case NETDEV_CHANGEMTU:
2238                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2239                         rt6_mtu_change(dev, dev->mtu);
2240                         idev->cnf.mtu6 = dev->mtu;
2241                         break;
2242                 }
2243
2244                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2245
2246         case NETDEV_DOWN:
2247         case NETDEV_UNREGISTER:
2248                 /*
2249                  *      Remove all addresses from this interface.
2250                  */
2251                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2252                 break;
2253
2254         case NETDEV_CHANGENAME:
2255 #ifdef CONFIG_SYSCTL
2256                 if (idev) {
2257                         addrconf_sysctl_unregister(&idev->cnf);
2258                         neigh_sysctl_unregister(idev->nd_parms);
2259                         neigh_sysctl_register(dev, idev->nd_parms,
2260                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2261                                               &ndisc_ifinfo_sysctl_change,
2262                                               NULL);
2263                         addrconf_sysctl_register(idev, &idev->cnf);
2264                 }
2265 #endif
2266                 break;
2267         };
2268
2269         return NOTIFY_OK;
2270 }
2271
2272 /*
2273  *      addrconf module should be notified of a device going up
2274  */
2275 static struct notifier_block ipv6_dev_notf = {
2276         .notifier_call = addrconf_notify,
2277         .priority = 0
2278 };
2279
2280 static int addrconf_ifdown(struct net_device *dev, int how)
2281 {
2282         struct inet6_dev *idev;
2283         struct inet6_ifaddr *ifa, **bifa;
2284         int i;
2285
2286         ASSERT_RTNL();
2287
2288         if (dev == &loopback_dev && how == 1)
2289                 how = 0;
2290
2291         rt6_ifdown(dev);
2292         neigh_ifdown(&nd_tbl, dev);
2293
2294         idev = __in6_dev_get(dev);
2295         if (idev == NULL)
2296                 return -ENODEV;
2297
2298         /* Step 1: remove reference to ipv6 device from parent device.
2299                    Do not dev_put!
2300          */
2301         if (how == 1) {
2302                 write_lock_bh(&addrconf_lock);
2303                 dev->ip6_ptr = NULL;
2304                 idev->dead = 1;
2305                 write_unlock_bh(&addrconf_lock);
2306
2307                 /* Step 1.5: remove snmp6 entry */
2308                 snmp6_unregister_dev(idev);
2309
2310         }
2311
2312         /* Step 2: clear hash table */
2313         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2314                 bifa = &inet6_addr_lst[i];
2315
2316                 write_lock_bh(&addrconf_hash_lock);
2317                 while ((ifa = *bifa) != NULL) {
2318                         if (ifa->idev == idev) {
2319                                 *bifa = ifa->lst_next;
2320                                 ifa->lst_next = NULL;
2321                                 addrconf_del_timer(ifa);
2322                                 in6_ifa_put(ifa);
2323                                 continue;
2324                         }
2325                         bifa = &ifa->lst_next;
2326                 }
2327                 write_unlock_bh(&addrconf_hash_lock);
2328         }
2329
2330         write_lock_bh(&idev->lock);
2331
2332         /* Step 3: clear flags for stateless addrconf */
2333         if (how != 1)
2334                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2335
2336         /* Step 4: clear address list */
2337 #ifdef CONFIG_IPV6_PRIVACY
2338         if (how == 1 && del_timer(&idev->regen_timer))
2339                 in6_dev_put(idev);
2340
2341         /* clear tempaddr list */
2342         while ((ifa = idev->tempaddr_list) != NULL) {
2343                 idev->tempaddr_list = ifa->tmp_next;
2344                 ifa->tmp_next = NULL;
2345                 ifa->dead = 1;
2346                 write_unlock_bh(&idev->lock);
2347                 spin_lock_bh(&ifa->lock);
2348
2349                 if (ifa->ifpub) {
2350                         in6_ifa_put(ifa->ifpub);
2351                         ifa->ifpub = NULL;
2352                 }
2353                 spin_unlock_bh(&ifa->lock);
2354                 in6_ifa_put(ifa);
2355                 write_lock_bh(&idev->lock);
2356         }
2357 #endif
2358         while ((ifa = idev->addr_list) != NULL) {
2359                 idev->addr_list = ifa->if_next;
2360                 ifa->if_next = NULL;
2361                 ifa->dead = 1;
2362                 addrconf_del_timer(ifa);
2363                 write_unlock_bh(&idev->lock);
2364
2365                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2366                 in6_ifa_put(ifa);
2367
2368                 write_lock_bh(&idev->lock);
2369         }
2370         write_unlock_bh(&idev->lock);
2371
2372         /* Step 5: Discard multicast list */
2373
2374         if (how == 1)
2375                 ipv6_mc_destroy_dev(idev);
2376         else
2377                 ipv6_mc_down(idev);
2378
2379         /* Step 5: netlink notification of this interface */
2380         idev->tstamp = jiffies;
2381         inet6_ifinfo_notify(RTM_DELLINK, idev);
2382
2383         /* Shot the device (if unregistered) */
2384
2385         if (how == 1) {
2386 #ifdef CONFIG_SYSCTL
2387                 addrconf_sysctl_unregister(&idev->cnf);
2388                 neigh_sysctl_unregister(idev->nd_parms);
2389 #endif
2390                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2391                 neigh_ifdown(&nd_tbl, dev);
2392                 in6_dev_put(idev);
2393         }
2394         return 0;
2395 }
2396
2397 static void addrconf_rs_timer(unsigned long data)
2398 {
2399         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2400
2401         if (ifp->idev->cnf.forwarding)
2402                 goto out;
2403
2404         if (ifp->idev->if_flags & IF_RA_RCVD) {
2405                 /*
2406                  *      Announcement received after solicitation
2407                  *      was sent
2408                  */
2409                 goto out;
2410         }
2411
2412         spin_lock(&ifp->lock);
2413         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2414                 struct in6_addr all_routers;
2415
2416                 /* The wait after the last probe can be shorter */
2417                 addrconf_mod_timer(ifp, AC_RS,
2418                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2419                                    ifp->idev->cnf.rtr_solicit_delay :
2420                                    ifp->idev->cnf.rtr_solicit_interval);
2421                 spin_unlock(&ifp->lock);
2422
2423                 ipv6_addr_all_routers(&all_routers);
2424
2425                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2426         } else {
2427                 spin_unlock(&ifp->lock);
2428                 /*
2429                  * Note: we do not support deprecated "all on-link"
2430                  * assumption any longer.
2431                  */
2432                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2433                        ifp->idev->dev->name);
2434         }
2435
2436 out:
2437         in6_ifa_put(ifp);
2438 }
2439
2440 /*
2441  *      Duplicate Address Detection
2442  */
2443 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2444 {
2445         unsigned long rand_num;
2446         struct inet6_dev *idev = ifp->idev;
2447
2448         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2449         ifp->probes = idev->cnf.dad_transmits;
2450         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2451 }
2452
2453 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2454 {
2455         struct inet6_dev *idev = ifp->idev;
2456         struct net_device *dev = idev->dev;
2457
2458         addrconf_join_solict(dev, &ifp->addr);
2459
2460         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2461                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2462                                         flags);
2463
2464         net_srandom(ifp->addr.s6_addr32[3]);
2465
2466         read_lock_bh(&idev->lock);
2467         if (ifp->dead)
2468                 goto out;
2469         spin_lock_bh(&ifp->lock);
2470
2471         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2472             !(ifp->flags&IFA_F_TENTATIVE)) {
2473                 ifp->flags &= ~IFA_F_TENTATIVE;
2474                 spin_unlock_bh(&ifp->lock);
2475                 read_unlock_bh(&idev->lock);
2476
2477                 addrconf_dad_completed(ifp);
2478                 return;
2479         }
2480
2481         if (!(idev->if_flags & IF_READY)) {
2482                 spin_unlock_bh(&ifp->lock);
2483                 read_unlock_bh(&idev->lock);
2484                 /*
2485                  * If the defice is not ready:
2486                  * - keep it tentative if it is a permanent address.
2487                  * - otherwise, kill it.
2488                  */
2489                 in6_ifa_hold(ifp);
2490                 addrconf_dad_stop(ifp);
2491                 return;
2492         }
2493         addrconf_dad_kick(ifp);
2494         spin_unlock_bh(&ifp->lock);
2495 out:
2496         read_unlock_bh(&idev->lock);
2497 }
2498
2499 static void addrconf_dad_timer(unsigned long data)
2500 {
2501         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2502         struct inet6_dev *idev = ifp->idev;
2503         struct in6_addr unspec;
2504         struct in6_addr mcaddr;
2505
2506         read_lock_bh(&idev->lock);
2507         if (idev->dead) {
2508                 read_unlock_bh(&idev->lock);
2509                 goto out;
2510         }
2511         spin_lock_bh(&ifp->lock);
2512         if (ifp->probes == 0) {
2513                 /*
2514                  * DAD was successful
2515                  */
2516
2517                 ifp->flags &= ~IFA_F_TENTATIVE;
2518                 spin_unlock_bh(&ifp->lock);
2519                 read_unlock_bh(&idev->lock);
2520
2521                 addrconf_dad_completed(ifp);
2522
2523                 goto out;
2524         }
2525
2526         ifp->probes--;
2527         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2528         spin_unlock_bh(&ifp->lock);
2529         read_unlock_bh(&idev->lock);
2530
2531         /* send a neighbour solicitation for our addr */
2532         memset(&unspec, 0, sizeof(unspec));
2533         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2534         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2535 out:
2536         in6_ifa_put(ifp);
2537 }
2538
2539 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2540 {
2541         struct net_device *     dev = ifp->idev->dev;
2542
2543         /*
2544          *      Configure the address for reception. Now it is valid.
2545          */
2546
2547         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2548
2549         /* If added prefix is link local and forwarding is off,
2550            start sending router solicitations.
2551          */
2552
2553         if (ifp->idev->cnf.forwarding == 0 &&
2554             ifp->idev->cnf.rtr_solicits > 0 &&
2555             (dev->flags&IFF_LOOPBACK) == 0 &&
2556             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2557                 struct in6_addr all_routers;
2558
2559                 ipv6_addr_all_routers(&all_routers);
2560
2561                 /*
2562                  *      If a host as already performed a random delay
2563                  *      [...] as part of DAD [...] there is no need
2564                  *      to delay again before sending the first RS
2565                  */
2566                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2567
2568                 spin_lock_bh(&ifp->lock);
2569                 ifp->probes = 1;
2570                 ifp->idev->if_flags |= IF_RS_SENT;
2571                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2572                 spin_unlock_bh(&ifp->lock);
2573         }
2574 }
2575
2576 static void addrconf_dad_run(struct inet6_dev *idev) {
2577         struct inet6_ifaddr *ifp;
2578
2579         read_lock_bh(&idev->lock);
2580         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2581                 spin_lock_bh(&ifp->lock);
2582                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2583                         spin_unlock_bh(&ifp->lock);
2584                         continue;
2585                 }
2586                 spin_unlock_bh(&ifp->lock);
2587                 addrconf_dad_kick(ifp);
2588         }
2589         read_unlock_bh(&idev->lock);
2590 }
2591
2592 #ifdef CONFIG_PROC_FS
2593 struct if6_iter_state {
2594         int bucket;
2595 };
2596
2597 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2598 {
2599         struct inet6_ifaddr *ifa = NULL;
2600         struct if6_iter_state *state = seq->private;
2601
2602         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2603                 ifa = inet6_addr_lst[state->bucket];
2604                 if (ifa)
2605                         break;
2606         }
2607         return ifa;
2608 }
2609
2610 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2611 {
2612         struct if6_iter_state *state = seq->private;
2613
2614         ifa = ifa->lst_next;
2615 try_again:
2616         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2617                 ifa = inet6_addr_lst[state->bucket];
2618                 goto try_again;
2619         }
2620         return ifa;
2621 }
2622
2623 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2624 {
2625         struct inet6_ifaddr *ifa = if6_get_first(seq);
2626
2627         if (ifa)
2628                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2629                         --pos;
2630         return pos ? NULL : ifa;
2631 }
2632
2633 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2634 {
2635         read_lock_bh(&addrconf_hash_lock);
2636         return if6_get_idx(seq, *pos);
2637 }
2638
2639 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2640 {
2641         struct inet6_ifaddr *ifa;
2642
2643         ifa = if6_get_next(seq, v);
2644         ++*pos;
2645         return ifa;
2646 }
2647
2648 static void if6_seq_stop(struct seq_file *seq, void *v)
2649 {
2650         read_unlock_bh(&addrconf_hash_lock);
2651 }
2652
2653 static int if6_seq_show(struct seq_file *seq, void *v)
2654 {
2655         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2656         seq_printf(seq,
2657                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2658                    NIP6(ifp->addr),
2659                    ifp->idev->dev->ifindex,
2660                    ifp->prefix_len,
2661                    ifp->scope,
2662                    ifp->flags,
2663                    ifp->idev->dev->name);
2664         return 0;
2665 }
2666
2667 static struct seq_operations if6_seq_ops = {
2668         .start  = if6_seq_start,
2669         .next   = if6_seq_next,
2670         .show   = if6_seq_show,
2671         .stop   = if6_seq_stop,
2672 };
2673
2674 static int if6_seq_open(struct inode *inode, struct file *file)
2675 {
2676         struct seq_file *seq;
2677         int rc = -ENOMEM;
2678         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2679
2680         if (!s)
2681                 goto out;
2682
2683         rc = seq_open(file, &if6_seq_ops);
2684         if (rc)
2685                 goto out_kfree;
2686
2687         seq = file->private_data;
2688         seq->private = s;
2689 out:
2690         return rc;
2691 out_kfree:
2692         kfree(s);
2693         goto out;
2694 }
2695
2696 static struct file_operations if6_fops = {
2697         .owner          = THIS_MODULE,
2698         .open           = if6_seq_open,
2699         .read           = seq_read,
2700         .llseek         = seq_lseek,
2701         .release        = seq_release_private,
2702 };
2703
2704 int __init if6_proc_init(void)
2705 {
2706         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2707                 return -ENOMEM;
2708         return 0;
2709 }
2710
2711 void if6_proc_exit(void)
2712 {
2713         proc_net_remove("if_inet6");
2714 }
2715 #endif  /* CONFIG_PROC_FS */
2716
2717 /*
2718  *      Periodic address status verification
2719  */
2720
2721 static void addrconf_verify(unsigned long foo)
2722 {
2723         struct inet6_ifaddr *ifp;
2724         unsigned long now, next;
2725         int i;
2726
2727         spin_lock_bh(&addrconf_verify_lock);
2728         now = jiffies;
2729         next = now + ADDR_CHECK_FREQUENCY;
2730
2731         del_timer(&addr_chk_timer);
2732
2733         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2734
2735 restart:
2736                 read_lock(&addrconf_hash_lock);
2737                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2738                         unsigned long age;
2739 #ifdef CONFIG_IPV6_PRIVACY
2740                         unsigned long regen_advance;
2741 #endif
2742
2743                         if (ifp->flags & IFA_F_PERMANENT)
2744                                 continue;
2745
2746                         spin_lock(&ifp->lock);
2747                         age = (now - ifp->tstamp) / HZ;
2748
2749 #ifdef CONFIG_IPV6_PRIVACY
2750                         regen_advance = ifp->idev->cnf.regen_max_retry *
2751                                         ifp->idev->cnf.dad_transmits *
2752                                         ifp->idev->nd_parms->retrans_time / HZ;
2753 #endif
2754
2755                         if (age >= ifp->valid_lft) {
2756                                 spin_unlock(&ifp->lock);
2757                                 in6_ifa_hold(ifp);
2758                                 read_unlock(&addrconf_hash_lock);
2759                                 ipv6_del_addr(ifp);
2760                                 goto restart;
2761                         } else if (age >= ifp->prefered_lft) {
2762                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2763                                 int deprecate = 0;
2764
2765                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2766                                         deprecate = 1;
2767                                         ifp->flags |= IFA_F_DEPRECATED;
2768                                 }
2769
2770                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2771                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2772
2773                                 spin_unlock(&ifp->lock);
2774
2775                                 if (deprecate) {
2776                                         in6_ifa_hold(ifp);
2777                                         read_unlock(&addrconf_hash_lock);
2778
2779                                         ipv6_ifa_notify(0, ifp);
2780                                         in6_ifa_put(ifp);
2781                                         goto restart;
2782                                 }
2783 #ifdef CONFIG_IPV6_PRIVACY
2784                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2785                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2786                                 if (age >= ifp->prefered_lft - regen_advance) {
2787                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2788                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2789                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2790                                         if (!ifp->regen_count && ifpub) {
2791                                                 ifp->regen_count++;
2792                                                 in6_ifa_hold(ifp);
2793                                                 in6_ifa_hold(ifpub);
2794                                                 spin_unlock(&ifp->lock);
2795                                                 read_unlock(&addrconf_hash_lock);
2796                                                 spin_lock(&ifpub->lock);
2797                                                 ifpub->regen_count = 0;
2798                                                 spin_unlock(&ifpub->lock);
2799                                                 ipv6_create_tempaddr(ifpub, ifp);
2800                                                 in6_ifa_put(ifpub);
2801                                                 in6_ifa_put(ifp);
2802                                                 goto restart;
2803                                         }
2804                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2805                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2806                                 spin_unlock(&ifp->lock);
2807 #endif
2808                         } else {
2809                                 /* ifp->prefered_lft <= ifp->valid_lft */
2810                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2811                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2812                                 spin_unlock(&ifp->lock);
2813                         }
2814                 }
2815                 read_unlock(&addrconf_hash_lock);
2816         }
2817
2818         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2819         add_timer(&addr_chk_timer);
2820         spin_unlock_bh(&addrconf_verify_lock);
2821 }
2822
2823 static int
2824 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2825 {
2826         struct rtattr **rta = arg;
2827         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2828         struct in6_addr *pfx;
2829
2830         pfx = NULL;
2831         if (rta[IFA_ADDRESS-1]) {
2832                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2833                         return -EINVAL;
2834                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2835         }
2836         if (rta[IFA_LOCAL-1]) {
2837                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2838                         return -EINVAL;
2839                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2840         }
2841         if (pfx == NULL)
2842                 return -EINVAL;
2843
2844         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2845 }
2846
2847 static int
2848 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2849 {
2850         struct rtattr  **rta = arg;
2851         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2852         struct in6_addr *pfx;
2853
2854         pfx = NULL;
2855         if (rta[IFA_ADDRESS-1]) {
2856                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2857                         return -EINVAL;
2858                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2859         }
2860         if (rta[IFA_LOCAL-1]) {
2861                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2862                         return -EINVAL;
2863                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2864         }
2865         if (pfx == NULL)
2866                 return -EINVAL;
2867
2868         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2869 }
2870
2871 /* Maximum length of ifa_cacheinfo attributes */
2872 #define INET6_IFADDR_RTA_SPACE \
2873                 RTA_SPACE(16) /* IFA_ADDRESS */ + \
2874                 RTA_SPACE(sizeof(struct ifa_cacheinfo)) /* CACHEINFO */
2875
2876 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2877                              u32 pid, u32 seq, int event, unsigned int flags)
2878 {
2879         struct ifaddrmsg *ifm;
2880         struct nlmsghdr  *nlh;
2881         struct ifa_cacheinfo ci;
2882         unsigned char    *b = skb->tail;
2883
2884         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2885         ifm = NLMSG_DATA(nlh);
2886         ifm->ifa_family = AF_INET6;
2887         ifm->ifa_prefixlen = ifa->prefix_len;
2888         ifm->ifa_flags = ifa->flags;
2889         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2890         if (ifa->scope&IFA_HOST)
2891                 ifm->ifa_scope = RT_SCOPE_HOST;
2892         else if (ifa->scope&IFA_LINK)
2893                 ifm->ifa_scope = RT_SCOPE_LINK;
2894         else if (ifa->scope&IFA_SITE)
2895                 ifm->ifa_scope = RT_SCOPE_SITE;
2896         ifm->ifa_index = ifa->idev->dev->ifindex;
2897         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2898         if (!(ifa->flags&IFA_F_PERMANENT)) {
2899                 ci.ifa_prefered = ifa->prefered_lft;
2900                 ci.ifa_valid = ifa->valid_lft;
2901                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2902                         long tval = (jiffies - ifa->tstamp)/HZ;
2903                         ci.ifa_prefered -= tval;
2904                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2905                                 ci.ifa_valid -= tval;
2906                 }
2907         } else {
2908                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2909                 ci.ifa_valid = INFINITY_LIFE_TIME;
2910         }
2911         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2912                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2913         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2914                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2915         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2916         nlh->nlmsg_len = skb->tail - b;
2917         return skb->len;
2918
2919 nlmsg_failure:
2920 rtattr_failure:
2921         skb_trim(skb, b - skb->data);
2922         return -1;
2923 }
2924
2925 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2926                                 u32 pid, u32 seq, int event, u16 flags)
2927 {
2928         struct ifaddrmsg *ifm;
2929         struct nlmsghdr  *nlh;
2930         struct ifa_cacheinfo ci;
2931         unsigned char    *b = skb->tail;
2932
2933         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2934         ifm = NLMSG_DATA(nlh);
2935         ifm->ifa_family = AF_INET6;
2936         ifm->ifa_prefixlen = 128;
2937         ifm->ifa_flags = IFA_F_PERMANENT;
2938         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2939         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2940                 ifm->ifa_scope = RT_SCOPE_SITE;
2941         ifm->ifa_index = ifmca->idev->dev->ifindex;
2942         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2943         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2944                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2945                     * 100 / HZ);
2946         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2947                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2948                     * 100 / HZ);
2949         ci.ifa_prefered = INFINITY_LIFE_TIME;
2950         ci.ifa_valid = INFINITY_LIFE_TIME;
2951         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2952         nlh->nlmsg_len = skb->tail - b;
2953         return skb->len;
2954
2955 nlmsg_failure:
2956 rtattr_failure:
2957         skb_trim(skb, b - skb->data);
2958         return -1;
2959 }
2960
2961 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2962                                 u32 pid, u32 seq, int event, unsigned int flags)
2963 {
2964         struct ifaddrmsg *ifm;
2965         struct nlmsghdr  *nlh;
2966         struct ifa_cacheinfo ci;
2967         unsigned char    *b = skb->tail;
2968
2969         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2970         ifm = NLMSG_DATA(nlh);
2971         ifm->ifa_family = AF_INET6;
2972         ifm->ifa_prefixlen = 128;
2973         ifm->ifa_flags = IFA_F_PERMANENT;
2974         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2975         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2976                 ifm->ifa_scope = RT_SCOPE_SITE;
2977         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2978         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2979         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2980                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2981                     * 100 / HZ);
2982         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2983                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2984                     * 100 / HZ);
2985         ci.ifa_prefered = INFINITY_LIFE_TIME;
2986         ci.ifa_valid = INFINITY_LIFE_TIME;
2987         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2988         nlh->nlmsg_len = skb->tail - b;
2989         return skb->len;
2990
2991 nlmsg_failure:
2992 rtattr_failure:
2993         skb_trim(skb, b - skb->data);
2994         return -1;
2995 }
2996
2997 enum addr_type_t
2998 {
2999         UNICAST_ADDR,
3000         MULTICAST_ADDR,
3001         ANYCAST_ADDR,
3002 };
3003
3004 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3005                            enum addr_type_t type)
3006 {
3007         int idx, ip_idx;
3008         int s_idx, s_ip_idx;
3009         int err = 1;
3010         struct net_device *dev;
3011         struct inet6_dev *idev = NULL;
3012         struct inet6_ifaddr *ifa;
3013         struct ifmcaddr6 *ifmca;
3014         struct ifacaddr6 *ifaca;
3015
3016         s_idx = cb->args[0];
3017         s_ip_idx = ip_idx = cb->args[1];
3018         read_lock(&dev_base_lock);
3019
3020         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3021                 if (idx < s_idx)
3022                         continue;
3023                 if (idx > s_idx)
3024                         s_ip_idx = 0;
3025                 ip_idx = 0;
3026                 if ((idev = in6_dev_get(dev)) == NULL)
3027                         continue;
3028                 read_lock_bh(&idev->lock);
3029                 switch (type) {
3030                 case UNICAST_ADDR:
3031                         /* unicast address incl. temp addr */
3032                         for (ifa = idev->addr_list; ifa;
3033                              ifa = ifa->if_next, ip_idx++) {
3034                                 if (ip_idx < s_ip_idx)
3035                                         continue;
3036                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3037                                     NETLINK_CB(cb->skb).pid,
3038                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3039                                     NLM_F_MULTI)) <= 0)
3040                                         goto done;
3041                         }
3042                         break;
3043                 case MULTICAST_ADDR:
3044                         /* multicast address */
3045                         for (ifmca = idev->mc_list; ifmca;
3046                              ifmca = ifmca->next, ip_idx++) {
3047                                 if (ip_idx < s_ip_idx)
3048                                         continue;
3049                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3050                                     NETLINK_CB(cb->skb).pid,
3051                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3052                                     NLM_F_MULTI)) <= 0)
3053                                         goto done;
3054                         }
3055                         break;
3056                 case ANYCAST_ADDR:
3057                         /* anycast address */
3058                         for (ifaca = idev->ac_list; ifaca;
3059                              ifaca = ifaca->aca_next, ip_idx++) {
3060                                 if (ip_idx < s_ip_idx)
3061                                         continue;
3062                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3063                                     NETLINK_CB(cb->skb).pid,
3064                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3065                                     NLM_F_MULTI)) <= 0)
3066                                         goto done;
3067                         }
3068                         break;
3069                 default:
3070                         break;
3071                 }
3072                 read_unlock_bh(&idev->lock);
3073                 in6_dev_put(idev);
3074         }
3075 done:
3076         if (err <= 0) {
3077                 read_unlock_bh(&idev->lock);
3078                 in6_dev_put(idev);
3079         }
3080         read_unlock(&dev_base_lock);
3081         cb->args[0] = idx;
3082         cb->args[1] = ip_idx;
3083         return skb->len;
3084 }
3085
3086 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3087 {
3088         enum addr_type_t type = UNICAST_ADDR;
3089         return inet6_dump_addr(skb, cb, type);
3090 }
3091
3092 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3093 {
3094         enum addr_type_t type = MULTICAST_ADDR;
3095         return inet6_dump_addr(skb, cb, type);
3096 }
3097
3098
3099 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3100 {
3101         enum addr_type_t type = ANYCAST_ADDR;
3102         return inet6_dump_addr(skb, cb, type);
3103 }
3104
3105 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3106 {
3107         struct sk_buff *skb;
3108         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE);
3109
3110         skb = alloc_skb(size, GFP_ATOMIC);
3111         if (!skb) {
3112                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3113                 return;
3114         }
3115         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3116                 kfree_skb(skb);
3117                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3118                 return;
3119         }
3120         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3121         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3122 }
3123
3124 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3125                                 __s32 *array, int bytes)
3126 {
3127         memset(array, 0, bytes);
3128         array[DEVCONF_FORWARDING] = cnf->forwarding;
3129         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3130         array[DEVCONF_MTU6] = cnf->mtu6;
3131         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3132         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3133         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3134         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3135         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3136         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3137         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3138         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3139 #ifdef CONFIG_IPV6_PRIVACY
3140         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3141         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3142         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3143         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3144         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3145 #endif
3146         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3147         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3148         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3149 #ifdef CONFIG_IPV6_ROUTER_PREF
3150         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3151         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3152 #ifdef CONFIV_IPV6_ROUTE_INFO
3153         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3154 #endif
3155 #endif
3156 }
3157
3158 /* Maximum length of ifinfomsg attributes */
3159 #define INET6_IFINFO_RTA_SPACE \
3160                 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \
3161                 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \
3162                 RTA_SPACE(sizeof(u32)) /* MTU */ + \
3163                 RTA_SPACE(sizeof(int)) /* LINK */ + \
3164                 RTA_SPACE(0) /* PROTINFO */ + \
3165                 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \
3166                 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \
3167                 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */
3168
3169 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3170                              u32 pid, u32 seq, int event, unsigned int flags)
3171 {
3172         struct net_device       *dev = idev->dev;
3173         __s32                   *array = NULL;
3174         struct ifinfomsg        *r;
3175         struct nlmsghdr         *nlh;
3176         unsigned char           *b = skb->tail;
3177         struct rtattr           *subattr;
3178         __u32                   mtu = dev->mtu;
3179         struct ifla_cacheinfo   ci;
3180
3181         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3182         r = NLMSG_DATA(nlh);
3183         r->ifi_family = AF_INET6;
3184         r->__ifi_pad = 0;
3185         r->ifi_type = dev->type;
3186         r->ifi_index = dev->ifindex;
3187         r->ifi_flags = dev_get_flags(dev);
3188         r->ifi_change = 0;
3189
3190         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3191
3192         if (dev->addr_len)
3193                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3194
3195         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3196         if (dev->ifindex != dev->iflink)
3197                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3198
3199         subattr = (struct rtattr*)skb->tail;
3200
3201         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3202
3203         /* return the device flags */
3204         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3205
3206         /* return interface cacheinfo */
3207         ci.max_reasm_len = IPV6_MAXPLEN;
3208         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3209                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3210         ci.reachable_time = idev->nd_parms->reachable_time;
3211         ci.retrans_time = idev->nd_parms->retrans_time;
3212         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3213
3214         /* return the device sysctl params */
3215         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3216                 goto rtattr_failure;
3217         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3218         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3219
3220         /* XXX - Statistics/MC not implemented */
3221         subattr->rta_len = skb->tail - (u8*)subattr;
3222
3223         nlh->nlmsg_len = skb->tail - b;
3224         kfree(array);
3225         return skb->len;
3226
3227 nlmsg_failure:
3228 rtattr_failure:
3229         kfree(array);
3230         skb_trim(skb, b - skb->data);
3231         return -1;
3232 }
3233
3234 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3235 {
3236         int idx, err;
3237         int s_idx = cb->args[0];
3238         struct net_device *dev;
3239         struct inet6_dev *idev;
3240
3241         read_lock(&dev_base_lock);
3242         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3243                 if (idx < s_idx)
3244                         continue;
3245                 if ((idev = in6_dev_get(dev)) == NULL)
3246                         continue;
3247                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3248                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3249                 in6_dev_put(idev);
3250                 if (err <= 0)
3251                         break;
3252         }
3253         read_unlock(&dev_base_lock);
3254         cb->args[0] = idx;
3255
3256         return skb->len;
3257 }
3258
3259 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3260 {
3261         struct sk_buff *skb;
3262         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE);
3263
3264         skb = alloc_skb(size, GFP_ATOMIC);
3265         if (!skb) {
3266                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3267                 return;
3268         }
3269         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3270                 kfree_skb(skb);
3271                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3272                 return;
3273         }
3274         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3275         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3276 }
3277
3278 /* Maximum length of prefix_cacheinfo attributes */
3279 #define INET6_PREFIX_RTA_SPACE \
3280                 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \
3281                 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */
3282
3283 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3284                         struct prefix_info *pinfo, u32 pid, u32 seq,
3285                         int event, unsigned int flags)
3286 {
3287         struct prefixmsg        *pmsg;
3288         struct nlmsghdr         *nlh;
3289         unsigned char           *b = skb->tail;
3290         struct prefix_cacheinfo ci;
3291
3292         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3293         pmsg = NLMSG_DATA(nlh);
3294         pmsg->prefix_family = AF_INET6;
3295         pmsg->prefix_pad1 = 0;
3296         pmsg->prefix_pad2 = 0;
3297         pmsg->prefix_ifindex = idev->dev->ifindex;
3298         pmsg->prefix_len = pinfo->prefix_len;
3299         pmsg->prefix_type = pinfo->type;
3300         pmsg->prefix_pad3 = 0;
3301
3302         pmsg->prefix_flags = 0;
3303         if (pinfo->onlink)
3304                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3305         if (pinfo->autoconf)
3306                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3307
3308         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3309
3310         ci.preferred_time = ntohl(pinfo->prefered);
3311         ci.valid_time = ntohl(pinfo->valid);
3312         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3313
3314         nlh->nlmsg_len = skb->tail - b;
3315         return skb->len;
3316
3317 nlmsg_failure:
3318 rtattr_failure:
3319         skb_trim(skb, b - skb->data);
3320         return -1;
3321 }
3322
3323 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3324                          struct prefix_info *pinfo)
3325 {
3326         struct sk_buff *skb;
3327         int size = NLMSG_SPACE(sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE);
3328
3329         skb = alloc_skb(size, GFP_ATOMIC);
3330         if (!skb) {
3331                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3332                 return;
3333         }
3334         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3335                 kfree_skb(skb);
3336                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3337                 return;
3338         }
3339         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3340         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3341 }
3342
3343 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3344         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3345         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3346         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3347         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3348         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3349         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3350         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3351         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3352         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3353                                       .dumpit   = inet6_dump_fib, },
3354 };
3355
3356 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3357 {
3358         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3359
3360         switch (event) {
3361         case RTM_NEWADDR:
3362                 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3363                 if (ifp->idev->cnf.forwarding)
3364                         addrconf_join_anycast(ifp);
3365                 break;
3366         case RTM_DELADDR:
3367                 if (ifp->idev->cnf.forwarding)
3368                         addrconf_leave_anycast(ifp);
3369                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3370                 dst_hold(&ifp->rt->u.dst);
3371                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3372                         dst_free(&ifp->rt->u.dst);
3373                 break;
3374         }
3375 }
3376
3377 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3378 {
3379         read_lock_bh(&addrconf_lock);
3380         if (likely(ifp->idev->dead == 0))
3381                 __ipv6_ifa_notify(event, ifp);
3382         read_unlock_bh(&addrconf_lock);
3383 }
3384
3385 #ifdef CONFIG_SYSCTL
3386
3387 static
3388 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3389                            void __user *buffer, size_t *lenp, loff_t *ppos)
3390 {
3391         int *valp = ctl->data;
3392         int val = *valp;
3393         int ret;
3394
3395         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3396
3397         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3398                 if (valp != &ipv6_devconf.forwarding) {
3399                         if ((!*valp) ^ (!val)) {
3400                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3401                                 if (idev == NULL)
3402                                         return ret;
3403                                 dev_forward_change(idev);
3404                         }
3405                 } else {
3406                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3407                         addrconf_forward_change();
3408                 }
3409                 if (*valp)
3410                         rt6_purge_dflt_routers();
3411         }
3412
3413         return ret;
3414 }
3415
3416 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3417                                             int __user *name, int nlen,
3418                                             void __user *oldval,
3419                                             size_t __user *oldlenp,
3420                                             void __user *newval, size_t newlen,
3421                                             void **context)
3422 {
3423         int *valp = table->data;
3424         int new;
3425
3426         if (!newval || !newlen)
3427                 return 0;
3428         if (newlen != sizeof(int))
3429                 return -EINVAL;
3430         if (get_user(new, (int __user *)newval))
3431                 return -EFAULT;
3432         if (new == *valp)
3433                 return 0;
3434         if (oldval && oldlenp) {
3435                 size_t len;
3436                 if (get_user(len, oldlenp))
3437                         return -EFAULT;
3438                 if (len) {
3439                         if (len > table->maxlen)
3440                                 len = table->maxlen;
3441                         if (copy_to_user(oldval, valp, len))
3442                                 return -EFAULT;
3443                         if (put_user(len, oldlenp))
3444                                 return -EFAULT;
3445                 }
3446         }
3447
3448         if (valp != &ipv6_devconf_dflt.forwarding) {
3449                 if (valp != &ipv6_devconf.forwarding) {
3450                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3451                         int changed;
3452                         if (unlikely(idev == NULL))
3453                                 return -ENODEV;
3454                         changed = (!*valp) ^ (!new);
3455                         *valp = new;
3456                         if (changed)
3457                                 dev_forward_change(idev);
3458                 } else {
3459                         *valp = new;
3460                         addrconf_forward_change();
3461                 }
3462
3463                 if (*valp)
3464                         rt6_purge_dflt_routers();
3465         } else
3466                 *valp = new;
3467
3468         return 1;
3469 }
3470
3471 static struct addrconf_sysctl_table
3472 {
3473         struct ctl_table_header *sysctl_header;
3474         ctl_table addrconf_vars[__NET_IPV6_MAX];
3475         ctl_table addrconf_dev[2];
3476         ctl_table addrconf_conf_dir[2];
3477         ctl_table addrconf_proto_dir[2];
3478         ctl_table addrconf_root_dir[2];
3479 } addrconf_sysctl = {
3480         .sysctl_header = NULL,
3481         .addrconf_vars = {
3482                 {
3483                         .ctl_name       =       NET_IPV6_FORWARDING,
3484                         .procname       =       "forwarding",
3485                         .data           =       &ipv6_devconf.forwarding,
3486                         .maxlen         =       sizeof(int),
3487                         .mode           =       0644,
3488                         .proc_handler   =       &addrconf_sysctl_forward,
3489                         .strategy       =       &addrconf_sysctl_forward_strategy,
3490                 },
3491                 {
3492                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3493                         .procname       =       "hop_limit",
3494                         .data           =       &ipv6_devconf.hop_limit,
3495                         .maxlen         =       sizeof(int),
3496                         .mode           =       0644,
3497                         .proc_handler   =       proc_dointvec,
3498                 },
3499                 {
3500                         .ctl_name       =       NET_IPV6_MTU,
3501                         .procname       =       "mtu",
3502                         .data           =       &ipv6_devconf.mtu6,
3503                         .maxlen         =       sizeof(int),
3504                         .mode           =       0644,
3505                         .proc_handler   =       &proc_dointvec,
3506                 },
3507                 {
3508                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3509                         .procname       =       "accept_ra",
3510                         .data           =       &ipv6_devconf.accept_ra,
3511                         .maxlen         =       sizeof(int),
3512                         .mode           =       0644,
3513                         .proc_handler   =       &proc_dointvec,
3514                 },
3515                 {
3516                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3517                         .procname       =       "accept_redirects",
3518                         .data           =       &ipv6_devconf.accept_redirects,
3519                         .maxlen         =       sizeof(int),
3520                         .mode           =       0644,
3521                         .proc_handler   =       &proc_dointvec,
3522                 },
3523                 {
3524                         .ctl_name       =       NET_IPV6_AUTOCONF,
3525                         .procname       =       "autoconf",
3526                         .data           =       &ipv6_devconf.autoconf,
3527                         .maxlen         =       sizeof(int),
3528                         .mode           =       0644,
3529                         .proc_handler   =       &proc_dointvec,
3530                 },
3531                 {
3532                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3533                         .procname       =       "dad_transmits",
3534                         .data           =       &ipv6_devconf.dad_transmits,
3535                         .maxlen         =       sizeof(int),
3536                         .mode           =       0644,
3537                         .proc_handler   =       &proc_dointvec,
3538                 },
3539                 {
3540                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3541                         .procname       =       "router_solicitations",
3542                         .data           =       &ipv6_devconf.rtr_solicits,
3543                         .maxlen         =       sizeof(int),
3544                         .mode           =       0644,
3545                         .proc_handler   =       &proc_dointvec,
3546                 },
3547                 {
3548                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3549                         .procname       =       "router_solicitation_interval",
3550                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3551                         .maxlen         =       sizeof(int),
3552                         .mode           =       0644,
3553                         .proc_handler   =       &proc_dointvec_jiffies,
3554                         .strategy       =       &sysctl_jiffies,
3555                 },
3556                 {
3557                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3558                         .procname       =       "router_solicitation_delay",
3559                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3560                         .maxlen         =       sizeof(int),
3561                         .mode           =       0644,
3562                         .proc_handler   =       &proc_dointvec_jiffies,
3563                         .strategy       =       &sysctl_jiffies,
3564                 },
3565                 {
3566                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3567                         .procname       =       "force_mld_version",
3568                         .data           =       &ipv6_devconf.force_mld_version,
3569                         .maxlen         =       sizeof(int),
3570                         .mode           =       0644,
3571                         .proc_handler   =       &proc_dointvec,
3572                 },
3573 #ifdef CONFIG_IPV6_PRIVACY
3574                 {
3575                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3576                         .procname       =       "use_tempaddr",
3577                         .data           =       &ipv6_devconf.use_tempaddr,
3578                         .maxlen         =       sizeof(int),
3579                         .mode           =       0644,
3580                         .proc_handler   =       &proc_dointvec,
3581                 },
3582                 {
3583                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3584                         .procname       =       "temp_valid_lft",
3585                         .data           =       &ipv6_devconf.temp_valid_lft,
3586                         .maxlen         =       sizeof(int),
3587                         .mode           =       0644,
3588                         .proc_handler   =       &proc_dointvec,
3589                 },
3590                 {
3591                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3592                         .procname       =       "temp_prefered_lft",
3593                         .data           =       &ipv6_devconf.temp_prefered_lft,
3594                         .maxlen         =       sizeof(int),
3595                         .mode           =       0644,
3596                         .proc_handler   =       &proc_dointvec,
3597                 },
3598                 {
3599                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3600                         .procname       =       "regen_max_retry",
3601                         .data           =       &ipv6_devconf.regen_max_retry,
3602                         .maxlen         =       sizeof(int),
3603                         .mode           =       0644,
3604                         .proc_handler   =       &proc_dointvec,
3605                 },
3606                 {
3607                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3608                         .procname       =       "max_desync_factor",
3609                         .data           =       &ipv6_devconf.max_desync_factor,
3610                         .maxlen         =       sizeof(int),
3611                         .mode           =       0644,
3612                         .proc_handler   =       &proc_dointvec,
3613                 },
3614 #endif
3615                 {
3616                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3617                         .procname       =       "max_addresses",
3618                         .data           =       &ipv6_devconf.max_addresses,
3619                         .maxlen         =       sizeof(int),
3620                         .mode           =       0644,
3621                         .proc_handler   =       &proc_dointvec,
3622                 },
3623                 {
3624                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3625                         .procname       =       "accept_ra_defrtr",
3626                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3627                         .maxlen         =       sizeof(int),
3628                         .mode           =       0644,
3629                         .proc_handler   =       &proc_dointvec,
3630                 },
3631                 {
3632                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3633                         .procname       =       "accept_ra_pinfo",
3634                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3635                         .maxlen         =       sizeof(int),
3636                         .mode           =       0644,
3637                         .proc_handler   =       &proc_dointvec,
3638                 },
3639 #ifdef CONFIG_IPV6_ROUTER_PREF
3640                 {
3641                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3642                         .procname       =       "accept_ra_rtr_pref",
3643                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3644                         .maxlen         =       sizeof(int),
3645                         .mode           =       0644,
3646                         .proc_handler   =       &proc_dointvec,
3647                 },
3648                 {
3649                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3650                         .procname       =       "router_probe_interval",
3651                         .data           =       &ipv6_devconf.rtr_probe_interval,
3652                         .maxlen         =       sizeof(int),
3653                         .mode           =       0644,
3654                         .proc_handler   =       &proc_dointvec_jiffies,
3655                         .strategy       =       &sysctl_jiffies,
3656                 },
3657 #ifdef CONFIV_IPV6_ROUTE_INFO
3658                 {
3659                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3660                         .procname       =       "accept_ra_rt_info_max_plen",
3661                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3662                         .maxlen         =       sizeof(int),
3663                         .mode           =       0644,
3664                         .proc_handler   =       &proc_dointvec,
3665                 },
3666 #endif
3667 #endif
3668                 {
3669                         .ctl_name       =       0,      /* sentinel */
3670                 }
3671         },
3672         .addrconf_dev = {
3673                 {
3674                         .ctl_name       =       NET_PROTO_CONF_ALL,
3675                         .procname       =       "all",
3676                         .mode           =       0555,
3677                         .child          =       addrconf_sysctl.addrconf_vars,
3678                 },
3679                 {
3680                         .ctl_name       =       0,      /* sentinel */
3681                 }
3682         },
3683         .addrconf_conf_dir = {
3684                 {
3685                         .ctl_name       =       NET_IPV6_CONF,
3686                         .procname       =       "conf",
3687                         .mode           =       0555,
3688                         .child          =       addrconf_sysctl.addrconf_dev,
3689                 },
3690                 {
3691                         .ctl_name       =       0,      /* sentinel */
3692                 }
3693         },
3694         .addrconf_proto_dir = {
3695                 {
3696                         .ctl_name       =       NET_IPV6,
3697                         .procname       =       "ipv6",
3698                         .mode           =       0555,
3699                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3700                 },
3701                 {
3702                         .ctl_name       =       0,      /* sentinel */
3703                 }
3704         },
3705         .addrconf_root_dir = {
3706                 {
3707                         .ctl_name       =       CTL_NET,
3708                         .procname       =       "net",
3709                         .mode           =       0555,
3710                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3711                 },
3712                 {
3713                         .ctl_name       =       0,      /* sentinel */
3714                 }
3715         },
3716 };
3717
3718 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3719 {
3720         int i;
3721         struct net_device *dev = idev ? idev->dev : NULL;
3722         struct addrconf_sysctl_table *t;
3723         char *dev_name = NULL;
3724
3725         t = kmalloc(sizeof(*t), GFP_KERNEL);
3726         if (t == NULL)
3727                 return;
3728         memcpy(t, &addrconf_sysctl, sizeof(*t));
3729         for (i=0; t->addrconf_vars[i].data; i++) {
3730                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3731                 t->addrconf_vars[i].de = NULL;
3732                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3733         }
3734         if (dev) {
3735                 dev_name = dev->name;
3736                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3737         } else {
3738                 dev_name = "default";
3739                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3740         }
3741
3742         /*
3743          * Make a copy of dev_name, because '.procname' is regarded as const
3744          * by sysctl and we wouldn't want anyone to change it under our feet
3745          * (see SIOCSIFNAME).
3746          */
3747         dev_name = kstrdup(dev_name, GFP_KERNEL);
3748         if (!dev_name)
3749             goto free;
3750
3751         t->addrconf_dev[0].procname = dev_name;
3752
3753         t->addrconf_dev[0].child = t->addrconf_vars;
3754         t->addrconf_dev[0].de = NULL;
3755         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3756         t->addrconf_conf_dir[0].de = NULL;
3757         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3758         t->addrconf_proto_dir[0].de = NULL;
3759         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3760         t->addrconf_root_dir[0].de = NULL;
3761
3762         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3763         if (t->sysctl_header == NULL)
3764                 goto free_procname;
3765         else
3766                 p->sysctl = t;
3767         return;
3768
3769         /* error path */
3770  free_procname:
3771         kfree(dev_name);
3772  free:
3773         kfree(t);
3774
3775         return;
3776 }
3777
3778 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3779 {
3780         if (p->sysctl) {
3781                 struct addrconf_sysctl_table *t = p->sysctl;
3782                 p->sysctl = NULL;
3783                 unregister_sysctl_table(t->sysctl_header);
3784                 kfree(t->addrconf_dev[0].procname);
3785                 kfree(t);
3786         }
3787 }
3788
3789
3790 #endif
3791
3792 /*
3793  *      Device notifier
3794  */
3795
3796 int register_inet6addr_notifier(struct notifier_block *nb)
3797 {
3798         return atomic_notifier_chain_register(&inet6addr_chain, nb);
3799 }
3800
3801 int unregister_inet6addr_notifier(struct notifier_block *nb)
3802 {
3803         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
3804 }
3805
3806 /*
3807  *      Init / cleanup code
3808  */
3809
3810 int __init addrconf_init(void)
3811 {
3812         int err = 0;
3813
3814         /* The addrconf netdev notifier requires that loopback_dev
3815          * has it's ipv6 private information allocated and setup
3816          * before it can bring up and give link-local addresses
3817          * to other devices which are up.
3818          *
3819          * Unfortunately, loopback_dev is not necessarily the first
3820          * entry in the global dev_base list of net devices.  In fact,
3821          * it is likely to be the very last entry on that list.
3822          * So this causes the notifier registry below to try and
3823          * give link-local addresses to all devices besides loopback_dev
3824          * first, then loopback_dev, which cases all the non-loopback_dev
3825          * devices to fail to get a link-local address.
3826          *
3827          * So, as a temporary fix, allocate the ipv6 structure for
3828          * loopback_dev first by hand.
3829          * Longer term, all of the dependencies ipv6 has upon the loopback
3830          * device and it being up should be removed.
3831          */
3832         rtnl_lock();
3833         if (!ipv6_add_dev(&loopback_dev))
3834                 err = -ENOMEM;
3835         rtnl_unlock();
3836         if (err)
3837                 return err;
3838
3839         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3840
3841         register_netdevice_notifier(&ipv6_dev_notf);
3842
3843         addrconf_verify(0);
3844         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3845 #ifdef CONFIG_SYSCTL
3846         addrconf_sysctl.sysctl_header =
3847                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3848         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3849 #endif
3850
3851         return 0;
3852 }
3853
3854 void __exit addrconf_cleanup(void)
3855 {
3856         struct net_device *dev;
3857         struct inet6_dev *idev;
3858         struct inet6_ifaddr *ifa;
3859         int i;
3860
3861         unregister_netdevice_notifier(&ipv6_dev_notf);
3862
3863         rtnetlink_links[PF_INET6] = NULL;
3864 #ifdef CONFIG_SYSCTL
3865         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3866         addrconf_sysctl_unregister(&ipv6_devconf);
3867 #endif
3868
3869         rtnl_lock();
3870
3871         /*
3872          *      clean dev list.
3873          */
3874
3875         for (dev=dev_base; dev; dev=dev->next) {
3876                 if ((idev = __in6_dev_get(dev)) == NULL)
3877                         continue;
3878                 addrconf_ifdown(dev, 1);
3879         }
3880         addrconf_ifdown(&loopback_dev, 2);
3881
3882         /*
3883          *      Check hash table.
3884          */
3885
3886         write_lock_bh(&addrconf_hash_lock);
3887         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3888                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3889                         struct inet6_ifaddr *bifa;
3890
3891                         bifa = ifa;
3892                         ifa = ifa->lst_next;
3893                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3894                         /* Do not free it; something is wrong.
3895                            Now we can investigate it with debugger.
3896                          */
3897                 }
3898         }
3899         write_unlock_bh(&addrconf_hash_lock);
3900
3901         del_timer(&addr_chk_timer);
3902
3903         rtnl_unlock();
3904
3905 #ifdef CONFIG_PROC_FS
3906         proc_net_remove("if_inet6");
3907 #endif
3908 }