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 static void
 512 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 513 {
 514         struct inet6_ifaddr *ifa, **ifap;
 515         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 516
 517         /*
 518          * Each device address list is sorted in order of scope -
 519          * global before linklocal.
 520          */
 521         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 522              ifap = &ifa->if_next) {
 523                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 524                         break;
 525         }
 526
 527         ifp->if_next = *ifap;
 528         *ifap = ifp;
 529 }
 530
 531 /* On success it returns ifp with increased reference count */
 532
 533 static struct inet6_ifaddr *
 534 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 535               int scope, u32 flags)
 536 {
 537         struct inet6_ifaddr *ifa = NULL;
 538         struct rt6_info *rt;
 539         int hash;
 540         int err = 0;
 541
 542         read_lock_bh(&addrconf_lock);
 543         if (idev->dead) {
 544                 err = -ENODEV;                  /*XXX*/
 545                 goto out2;
 546         }
 547
 548         write_lock(&addrconf_hash_lock);
 549
 550         /* Ignore adding duplicate addresses on an interface */
 551         if (ipv6_chk_same_addr(addr, idev->dev)) {
 552                 ADBG(("ipv6_add_addr: already assigned\n"));
 553                 err = -EEXIST;
 554                 goto out;
 555         }
 556
 557         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 558
 559         if (ifa == NULL) {
 560                 ADBG(("ipv6_add_addr: malloc failed\n"));
 561                 err = -ENOBUFS;
 562                 goto out;
 563         }
 564
 565         rt = addrconf_dst_alloc(idev, addr, 0);
 566         if (IS_ERR(rt)) {
 567                 err = PTR_ERR(rt);
 568                 goto out;
 569         }
 570
 571         ipv6_addr_copy(&ifa->addr, addr);
 572
 573         spin_lock_init(&ifa->lock);
 574         init_timer(&ifa->timer);
 575         ifa->timer.data = (unsigned long) ifa;
 576         ifa->scope = scope;
 577         ifa->prefix_len = pfxlen;
 578         ifa->flags = flags | IFA_F_TENTATIVE;
 579         ifa->cstamp = ifa->tstamp = jiffies;
 580
 581         ifa->idev = idev;
 582         in6_dev_hold(idev);
 583         /* For caller */
 584         in6_ifa_hold(ifa);
 585
 586         /* Add to big hash table */
 587         hash = ipv6_addr_hash(addr);
 588
 589         ifa->lst_next = inet6_addr_lst[hash];
 590         inet6_addr_lst[hash] = ifa;
 591         in6_ifa_hold(ifa);
 592         write_unlock(&addrconf_hash_lock);
 593
 594         write_lock(&idev->lock);
 595         /* Add to inet6_dev unicast addr list. */
 596         ipv6_link_dev_addr(idev, ifa);
 597
 598 #ifdef CONFIG_IPV6_PRIVACY
 599         if (ifa->flags&IFA_F_TEMPORARY) {
 600                 ifa->tmp_next = idev->tempaddr_list;
 601                 idev->tempaddr_list = ifa;
 602                 in6_ifa_hold(ifa);
 603         }
 604 #endif
 605
 606         ifa->rt = rt;
 607
 608         in6_ifa_hold(ifa);
 609         write_unlock(&idev->lock);
 610 out2:
 611         read_unlock_bh(&addrconf_lock);
 612
 613         if (likely(err == 0))
 614                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 615         else {
 616                 kfree(ifa);
 617                 ifa = ERR_PTR(err);
 618         }
 619
 620         return ifa;
 621 out:
 622         write_unlock(&addrconf_hash_lock);
 623         goto out2;
 624 }
 625
 626 /* This function wants to get referenced ifp and releases it before return */
 627
 628 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 629 {
 630         struct inet6_ifaddr *ifa, **ifap;
 631         struct inet6_dev *idev = ifp->idev;
 632         int hash;
 633         int deleted = 0, onlink = 0;
 634         unsigned long expires = jiffies;
 635
 636         hash = ipv6_addr_hash(&ifp->addr);
 637
 638         ifp->dead = 1;
 639
 640         write_lock_bh(&addrconf_hash_lock);
 641         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 642              ifap = &ifa->lst_next) {
 643                 if (ifa == ifp) {
 644                         *ifap = ifa->lst_next;
 645                         __in6_ifa_put(ifp);
 646                         ifa->lst_next = NULL;
 647                         break;
 648                 }
 649         }
 650         write_unlock_bh(&addrconf_hash_lock);
 651
 652         write_lock_bh(&idev->lock);
 653 #ifdef CONFIG_IPV6_PRIVACY
 654         if (ifp->flags&IFA_F_TEMPORARY) {
 655                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 656                      ifap = &ifa->tmp_next) {
 657                         if (ifa == ifp) {
 658                                 *ifap = ifa->tmp_next;
 659                                 if (ifp->ifpub) {
 660                                         in6_ifa_put(ifp->ifpub);
 661                                         ifp->ifpub = NULL;
 662                                 }
 663                                 __in6_ifa_put(ifp);
 664                                 ifa->tmp_next = NULL;
 665                                 break;
 666                         }
 667                 }
 668         }
 669 #endif
 670
 671         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 672                 if (ifa == ifp) {
 673                         *ifap = ifa->if_next;
 674                         __in6_ifa_put(ifp);
 675                         ifa->if_next = NULL;
 676                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 677                                 break;
 678                         deleted = 1;
 679                         continue;
 680                 } else if (ifp->flags & IFA_F_PERMANENT) {
 681                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 682                                               ifp->prefix_len)) {
 683                                 if (ifa->flags & IFA_F_PERMANENT) {
 684                                         onlink = 1;
 685                                         if (deleted)
 686                                                 break;
 687                                 } else {
 688                                         unsigned long lifetime;
 689
 690                                         if (!onlink)
 691                                                 onlink = -1;
 692
 693                                         spin_lock(&ifa->lock);
 694                                         lifetime = min_t(unsigned long,
 695                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 696                                         if (time_before(expires,
 697                                                         ifa->tstamp + lifetime * HZ))
 698                                                 expires = ifa->tstamp + lifetime * HZ;
 699                                         spin_unlock(&ifa->lock);
 700                                 }
 701                         }
 702                 }
 703                 ifap = &ifa->if_next;
 704         }
 705         write_unlock_bh(&idev->lock);
 706
 707         ipv6_ifa_notify(RTM_DELADDR, ifp);
 708
 709         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 710
 711         addrconf_del_timer(ifp);
 712
 713         /*
 714          * Purge or update corresponding prefix
 715          *
 716          * 1) we don't purge prefix here if address was not permanent.
 717          *    prefix is managed by its own lifetime.
 718          * 2) if there're no addresses, delete prefix.
 719          * 3) if there're still other permanent address(es),
 720          *    corresponding prefix is still permanent.
 721          * 4) otherwise, update prefix lifetime to the
 722          *    longest valid lifetime among the corresponding
 723          *    addresses on the device.
 724          *    Note: subsequent RA will update lifetime.
 725          *
 726          * --yoshfuji
 727          */
 728         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 729                 struct in6_addr prefix;
 730                 struct rt6_info *rt;
 731
 732                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 733                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 734
 735                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 736                         if (onlink == 0) {
 737                                 ip6_del_rt(rt, NULL, NULL, NULL);
 738                                 rt = NULL;
 739                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 740                                 rt->rt6i_expires = expires;
 741                                 rt->rt6i_flags |= RTF_EXPIRES;
 742                         }
 743                 }
 744                 dst_release(&rt->u.dst);
 745         }
 746
 747         in6_ifa_put(ifp);
 748 }
 749
 750 #ifdef CONFIG_IPV6_PRIVACY
 751 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 752 {
 753         struct inet6_dev *idev = ifp->idev;
 754         struct in6_addr addr, *tmpaddr;
 755         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 756         int tmp_plen;
 757         int ret = 0;
 758         int max_addresses;
 759
 760         write_lock(&idev->lock);
 761         if (ift) {
 762                 spin_lock_bh(&ift->lock);
 763                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 764                 spin_unlock_bh(&ift->lock);
 765                 tmpaddr = &addr;
 766         } else {
 767                 tmpaddr = NULL;
 768         }
 769 retry:
 770         in6_dev_hold(idev);
 771         if (idev->cnf.use_tempaddr <= 0) {
 772                 write_unlock(&idev->lock);
 773                 printk(KERN_INFO
 774                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 775                 in6_dev_put(idev);
 776                 ret = -1;
 777                 goto out;
 778         }
 779         spin_lock_bh(&ifp->lock);
 780         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 781                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 782                 spin_unlock_bh(&ifp->lock);
 783                 write_unlock(&idev->lock);
 784                 printk(KERN_WARNING
 785                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 786                 in6_dev_put(idev);
 787                 ret = -1;
 788                 goto out;
 789         }
 790         in6_ifa_hold(ifp);
 791         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 792         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 793                 spin_unlock_bh(&ifp->lock);
 794                 write_unlock(&idev->lock);
 795                 printk(KERN_WARNING
 796                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 797                 in6_ifa_put(ifp);
 798                 in6_dev_put(idev);
 799                 ret = -1;
 800                 goto out;
 801         }
 802         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 803         tmp_valid_lft = min_t(__u32,
 804                               ifp->valid_lft,
 805                               idev->cnf.temp_valid_lft);
 806         tmp_prefered_lft = min_t(__u32,
 807                                  ifp->prefered_lft,
 808                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 809         tmp_plen = ifp->prefix_len;
 810         max_addresses = idev->cnf.max_addresses;
 811         tmp_cstamp = ifp->cstamp;
 812         tmp_tstamp = ifp->tstamp;
 813         spin_unlock_bh(&ifp->lock);
 814
 815         write_unlock(&idev->lock);
 816         ift = !max_addresses ||
 817               ipv6_count_addresses(idev) < max_addresses ?
 818                 ipv6_add_addr(idev, &addr, tmp_plen,
 819                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 820         if (!ift || IS_ERR(ift)) {
 821                 in6_ifa_put(ifp);
 822                 in6_dev_put(idev);
 823                 printk(KERN_INFO
 824                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 825                 tmpaddr = &addr;
 826                 write_lock(&idev->lock);
 827                 goto retry;
 828         }
 829
 830         spin_lock_bh(&ift->lock);
 831         ift->ifpub = ifp;
 832         ift->valid_lft = tmp_valid_lft;
 833         ift->prefered_lft = tmp_prefered_lft;
 834         ift->cstamp = tmp_cstamp;
 835         ift->tstamp = tmp_tstamp;
 836         spin_unlock_bh(&ift->lock);
 837
 838         addrconf_dad_start(ift, 0);
 839         in6_ifa_put(ift);
 840         in6_dev_put(idev);
 841 out:
 842         return ret;
 843 }
 844 #endif
 845
 846 /*
 847  *      Choose an appropriate source address (RFC3484)
 848  */
 849 struct ipv6_saddr_score {
 850         int             addr_type;
 851         unsigned int    attrs;
 852         int             matchlen;
 853         int             scope;
 854         unsigned int    rule;
 855 };
 856
 857 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 858 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 859 #define IPV6_SADDR_SCORE_HOA            0x0008
 860 #define IPV6_SADDR_SCORE_OIF            0x0010
 861 #define IPV6_SADDR_SCORE_LABEL          0x0020
 862 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 863
 864 static int inline ipv6_saddr_preferred(int type)
 865 {
 866         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 867                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 868                 return 1;
 869         return 0;
 870 }
 871
 872 /* static matching label */
 873 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 874 {
 875  /*
 876   *     prefix (longest match)  label
 877   *     -----------------------------
 878   *     ::1/128                 0
 879   *     ::/0                    1
 880   *     2002::/16               2
 881   *     ::/96                   3
 882   *     ::ffff:0:0/96           4
 883   *     fc00::/7                5
 884   *     2001::/32               6
 885   */
 886         if (type & IPV6_ADDR_LOOPBACK)
 887                 return 0;
 888         else if (type & IPV6_ADDR_COMPATv4)
 889                 return 3;
 890         else if (type & IPV6_ADDR_MAPPED)
 891                 return 4;
 892         else if (addr->s6_addr32[0] == htonl(0x20010000))
 893                 return 6;
 894         else if (addr->s6_addr16[0] == htons(0x2002))
 895                 return 2;
 896         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 897                 return 5;
 898         return 1;
 899 }
 900
 901 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 902                        struct in6_addr *daddr, struct in6_addr *saddr)
 903 {
 904         struct ipv6_saddr_score hiscore;
 905         struct inet6_ifaddr *ifa_result = NULL;
 906         int daddr_type = __ipv6_addr_type(daddr);
 907         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 908         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 909         struct net_device *dev;
 910
 911         memset(&hiscore, 0, sizeof(hiscore));
 912
 913         read_lock(&dev_base_lock);
 914         read_lock(&addrconf_lock);
 915
 916         for (dev = dev_base; dev; dev=dev->next) {
 917                 struct inet6_dev *idev;
 918                 struct inet6_ifaddr *ifa;
 919
 920                 /* Rule 0: Candidate Source Address (section 4)
 921                  *  - multicast and link-local destination address,
 922                  *    the set of candidate source address MUST only
 923                  *    include addresses assigned to interfaces
 924                  *    belonging to the same link as the outgoing
 925                  *    interface.
 926                  * (- For site-local destination addresses, the
 927                  *    set of candidate source addresses MUST only
 928                  *    include addresses assigned to interfaces
 929                  *    belonging to the same site as the outgoing
 930                  *    interface.)
 931                  */
 932                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 933                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 934                     daddr_dev && dev != daddr_dev)
 935                         continue;
 936
 937                 idev = __in6_dev_get(dev);
 938                 if (!idev)
 939                         continue;
 940
 941                 read_lock_bh(&idev->lock);
 942                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 943                         struct ipv6_saddr_score score;
 944
 945                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 946
 947                         /* Rule 0:
 948                          * - Tentative Address (RFC2462 section 5.4)
 949                          *  - A tentative address is not considered
 950                          *    "assigned to an interface" in the traditional
 951                          *    sense.
 952                          * - Candidate Source Address (section 4)
 953                          *  - In any case, anycast addresses, multicast
 954                          *    addresses, and the unspecified address MUST
 955                          *    NOT be included in a candidate set.
 956                          */
 957                         if (ifa->flags & IFA_F_TENTATIVE)
 958                                 continue;
 959                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 960                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 961                                 LIMIT_NETDEBUG(KERN_DEBUG
 962                                                "ADDRCONF: unspecified / multicast address"
 963                                                "assigned as unicast address on %s",
 964                                                dev->name);
 965                                 continue;
 966                         }
 967
 968                         score.attrs = 0;
 969                         score.matchlen = 0;
 970                         score.scope = 0;
 971                         score.rule = 0;
 972
 973                         if (ifa_result == NULL) {
 974                                 /* record it if the first available entry */
 975                                 goto record_it;
 976                         }
 977
 978                         /* Rule 1: Prefer same address */
 979                         if (hiscore.rule < 1) {
 980                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 981                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 982                                 hiscore.rule++;
 983                         }
 984                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 985                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 986                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 987                                         score.rule = 1;
 988                                         goto record_it;
 989                                 }
 990                         } else {
 991                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 992                                         continue;
 993                         }
 994
 995                         /* Rule 2: Prefer appropriate scope */
 996                         if (hiscore.rule < 2) {
 997                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 998                                 hiscore.rule++;
 999                         }
1000                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1001                         if (hiscore.scope < score.scope) {
1002                                 if (hiscore.scope < daddr_scope) {
1003                                         score.rule = 2;
1004                                         goto record_it;
1005                                 } else
1006                                         continue;
1007                         } else if (score.scope < hiscore.scope) {
1008                                 if (score.scope < daddr_scope)
1009                                         break; /* addresses sorted by scope */
1010                                 else {
1011                                         score.rule = 2;
1012                                         goto record_it;
1013                                 }
1014                         }
1015
1016                         /* Rule 3: Avoid deprecated address */
1017                         if (hiscore.rule < 3) {
1018                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1019                                     !(ifa_result->flags & IFA_F_DEPRECATED))
1020                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1021                                 hiscore.rule++;
1022                         }
1023                         if (ipv6_saddr_preferred(score.addr_type) ||
1024                             !(ifa->flags & IFA_F_DEPRECATED)) {
1025                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1026                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1027                                         score.rule = 3;
1028                                         goto record_it;
1029                                 }
1030                         } else {
1031                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1032                                         continue;
1033                         }
1034
1035                         /* Rule 4: Prefer home address -- not implemented yet */
1036                         if (hiscore.rule < 4)
1037                                 hiscore.rule++;
1038
1039                         /* Rule 5: Prefer outgoing interface */
1040                         if (hiscore.rule < 5) {
1041                                 if (daddr_dev == NULL ||
1042                                     daddr_dev == ifa_result->idev->dev)
1043                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1044                                 hiscore.rule++;
1045                         }
1046                         if (daddr_dev == NULL ||
1047                             daddr_dev == ifa->idev->dev) {
1048                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1049                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1050                                         score.rule = 5;
1051                                         goto record_it;
1052                                 }
1053                         } else {
1054                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1055                                         continue;
1056                         }
1057
1058                         /* Rule 6: Prefer matching label */
1059                         if (hiscore.rule < 6) {
1060                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1061                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1062                                 hiscore.rule++;
1063                         }
1064                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1065                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1066                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1067                                         score.rule = 6;
1068                                         goto record_it;
1069                                 }
1070                         } else {
1071                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1072                                         continue;
1073                         }
1074
1075 #ifdef CONFIG_IPV6_PRIVACY
1076                         /* Rule 7: Prefer public address
1077                          * Note: prefer temprary address if use_tempaddr >= 2
1078                          */
1079                         if (hiscore.rule < 7) {
1080                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1081                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1082                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1083                                 hiscore.rule++;
1084                         }
1085                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1086                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1087                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1088                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1089                                         score.rule = 7;
1090                                         goto record_it;
1091                                 }
1092                         } else {
1093                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1094                                         continue;
1095                         }
1096 #else
1097                         if (hiscore.rule < 7)
1098                                 hiscore.rule++;
1099 #endif
1100                         /* Rule 8: Use longest matching prefix */
1101                         if (hiscore.rule < 8) {
1102                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1103                                 hiscore.rule++;
1104                         }
1105                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1106                         if (score.matchlen > hiscore.matchlen) {
1107                                 score.rule = 8;
1108                                 goto record_it;
1109                         }
1110 #if 0
1111                         else if (score.matchlen < hiscore.matchlen)
1112                                 continue;
1113 #endif
1114
1115                         /* Final Rule: choose first available one */
1116                         continue;
1117 record_it:
1118                         if (ifa_result)
1119                                 in6_ifa_put(ifa_result);
1120                         in6_ifa_hold(ifa);
1121                         ifa_result = ifa;
1122                         hiscore = score;
1123                 }
1124                 read_unlock_bh(&idev->lock);
1125         }
1126         read_unlock(&addrconf_lock);
1127         read_unlock(&dev_base_lock);
1128
1129         if (!ifa_result)
1130                 return -EADDRNOTAVAIL;
1131
1132         ipv6_addr_copy(saddr, &ifa_result->addr);
1133         in6_ifa_put(ifa_result);
1134         return 0;
1135 }
1136
1137
1138 int ipv6_get_saddr(struct dst_entry *dst,
1139                    struct in6_addr *daddr, struct in6_addr *saddr)
1140 {
1141         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1142 }
1143
1144
1145 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1146 {
1147         struct inet6_dev *idev;
1148         int err = -EADDRNOTAVAIL;
1149
1150         read_lock(&addrconf_lock);
1151         if ((idev = __in6_dev_get(dev)) != NULL) {
1152                 struct inet6_ifaddr *ifp;
1153
1154                 read_lock_bh(&idev->lock);
1155                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1156                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1157                                 ipv6_addr_copy(addr, &ifp->addr);
1158                                 err = 0;
1159                                 break;
1160                         }
1161                 }
1162                 read_unlock_bh(&idev->lock);
1163         }
1164         read_unlock(&addrconf_lock);
1165         return err;
1166 }
1167
1168 static int ipv6_count_addresses(struct inet6_dev *idev)
1169 {
1170         int cnt = 0;
1171         struct inet6_ifaddr *ifp;
1172
1173         read_lock_bh(&idev->lock);
1174         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1175                 cnt++;
1176         read_unlock_bh(&idev->lock);
1177         return cnt;
1178 }
1179
1180 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1181 {
1182         struct inet6_ifaddr * ifp;
1183         u8 hash = ipv6_addr_hash(addr);
1184
1185         read_lock_bh(&addrconf_hash_lock);
1186         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1187                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1188                     !(ifp->flags&IFA_F_TENTATIVE)) {
1189                         if (dev == NULL || ifp->idev->dev == dev ||
1190                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1191                                 break;
1192                 }
1193         }
1194         read_unlock_bh(&addrconf_hash_lock);
1195         return ifp != NULL;
1196 }
1197
1198 static
1199 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1200 {
1201         struct inet6_ifaddr * ifp;
1202         u8 hash = ipv6_addr_hash(addr);
1203
1204         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1205                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1206                         if (dev == NULL || ifp->idev->dev == dev)
1207                                 break;
1208                 }
1209         }
1210         return ifp != NULL;
1211 }
1212
1213 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1214 {
1215         struct inet6_ifaddr * ifp;
1216         u8 hash = ipv6_addr_hash(addr);
1217
1218         read_lock_bh(&addrconf_hash_lock);
1219         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1220                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1221                         if (dev == NULL || ifp->idev->dev == dev ||
1222                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1223                                 in6_ifa_hold(ifp);
1224                                 break;
1225                         }
1226                 }
1227         }
1228         read_unlock_bh(&addrconf_hash_lock);
1229
1230         return ifp;
1231 }
1232
1233 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1234 {
1235         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1236         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1237         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1238         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1239         int sk_ipv6only = ipv6_only_sock(sk);
1240         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1241         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1242         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1243
1244         if (!sk2_rcv_saddr && !sk_ipv6only)
1245                 return 1;
1246
1247         if (addr_type2 == IPV6_ADDR_ANY &&
1248             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1249                 return 1;
1250
1251         if (addr_type == IPV6_ADDR_ANY &&
1252             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1253                 return 1;
1254
1255         if (sk2_rcv_saddr6 &&
1256             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1257                 return 1;
1258
1259         if (addr_type == IPV6_ADDR_MAPPED &&
1260             !sk2_ipv6only &&
1261             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1262                 return 1;
1263
1264         return 0;
1265 }
1266
1267 /* Gets referenced address, destroys ifaddr */
1268
1269 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1270 {
1271         if (ifp->flags&IFA_F_PERMANENT) {
1272                 spin_lock_bh(&ifp->lock);
1273                 addrconf_del_timer(ifp);
1274                 ifp->flags |= IFA_F_TENTATIVE;
1275                 spin_unlock_bh(&ifp->lock);
1276                 in6_ifa_put(ifp);
1277 #ifdef CONFIG_IPV6_PRIVACY
1278         } else if (ifp->flags&IFA_F_TEMPORARY) {
1279                 struct inet6_ifaddr *ifpub;
1280                 spin_lock_bh(&ifp->lock);
1281                 ifpub = ifp->ifpub;
1282                 if (ifpub) {
1283                         in6_ifa_hold(ifpub);
1284                         spin_unlock_bh(&ifp->lock);
1285                         ipv6_create_tempaddr(ifpub, ifp);
1286                         in6_ifa_put(ifpub);
1287                 } else {
1288                         spin_unlock_bh(&ifp->lock);
1289                 }
1290                 ipv6_del_addr(ifp);
1291 #endif
1292         } else
1293                 ipv6_del_addr(ifp);
1294 }
1295
1296 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1297 {
1298         if (net_ratelimit())
1299                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1300         addrconf_dad_stop(ifp);
1301 }
1302
1303 /* Join to solicited addr multicast group. */
1304
1305 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1306 {
1307         struct in6_addr maddr;
1308
1309         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1310                 return;
1311
1312         addrconf_addr_solict_mult(addr, &maddr);
1313         ipv6_dev_mc_inc(dev, &maddr);
1314 }
1315
1316 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1317 {
1318         struct in6_addr maddr;
1319
1320         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1321                 return;
1322
1323         addrconf_addr_solict_mult(addr, &maddr);
1324         __ipv6_dev_mc_dec(idev, &maddr);
1325 }
1326
1327 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1328 {
1329         struct in6_addr addr;
1330         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1331         if (ipv6_addr_any(&addr))
1332                 return;
1333         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1334 }
1335
1336 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1337 {
1338         struct in6_addr addr;
1339         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1340         if (ipv6_addr_any(&addr))
1341                 return;
1342         __ipv6_dev_ac_dec(ifp->idev, &addr);
1343 }
1344
1345 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1346 {
1347         if (dev->addr_len != ETH_ALEN)
1348                 return -1;
1349         memcpy(eui, dev->dev_addr, 3);
1350         memcpy(eui + 5, dev->dev_addr + 3, 3);
1351
1352         /*
1353          * The zSeries OSA network cards can be shared among various
1354          * OS instances, but the OSA cards have only one MAC address.
1355          * This leads to duplicate address conflicts in conjunction
1356          * with IPv6 if more than one instance uses the same card.
1357          *
1358          * The driver for these cards can deliver a unique 16-bit
1359          * identifier for each instance sharing the same card.  It is
1360          * placed instead of 0xFFFE in the interface identifier.  The
1361          * "u" bit of the interface identifier is not inverted in this
1362          * case.  Hence the resulting interface identifier has local
1363          * scope according to RFC2373.
1364          */
1365         if (dev->dev_id) {
1366                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1367                 eui[4] = dev->dev_id & 0xFF;
1368         } else {
1369                 eui[3] = 0xFF;
1370                 eui[4] = 0xFE;
1371                 eui[0] ^= 2;
1372         }
1373         return 0;
1374 }
1375
1376 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1377 {
1378         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1379         if (dev->addr_len != ARCNET_ALEN)
1380                 return -1;
1381         memset(eui, 0, 7);
1382         eui[7] = *(u8*)dev->dev_addr;
1383         return 0;
1384 }
1385
1386 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1387 {
1388         if (dev->addr_len != INFINIBAND_ALEN)
1389                 return -1;
1390         memcpy(eui, dev->dev_addr + 12, 8);
1391         eui[0] |= 2;
1392         return 0;
1393 }
1394
1395 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1396 {
1397         switch (dev->type) {
1398         case ARPHRD_ETHER:
1399         case ARPHRD_FDDI:
1400         case ARPHRD_IEEE802_TR:
1401                 return addrconf_ifid_eui48(eui, dev);
1402         case ARPHRD_ARCNET:
1403                 return addrconf_ifid_arcnet(eui, dev);
1404         case ARPHRD_INFINIBAND:
1405                 return addrconf_ifid_infiniband(eui, dev);
1406         }
1407         return -1;
1408 }
1409
1410 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1411 {
1412         int err = -1;
1413         struct inet6_ifaddr *ifp;
1414
1415         read_lock_bh(&idev->lock);
1416         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1417                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1418                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1419                         err = 0;
1420                         break;
1421                 }
1422         }
1423         read_unlock_bh(&idev->lock);
1424         return err;
1425 }
1426
1427 #ifdef CONFIG_IPV6_PRIVACY
1428 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1429 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1430 {
1431 regen:
1432         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1433         idev->rndid[0] &= ~0x02;
1434
1435         /*
1436          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1437          * check if generated address is not inappropriate
1438          *
1439          *  - Reserved subnet anycast (RFC 2526)
1440          *      11111101 11....11 1xxxxxxx
1441          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1442          *      00-00-5E-FE-xx-xx-xx-xx
1443          *  - value 0
1444          *  - XXX: already assigned to an address on the device
1445          */
1446         if (idev->rndid[0] == 0xfd &&
1447             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1448             (idev->rndid[7]&0x80))
1449                 goto regen;
1450         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1451                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1452                         goto regen;
1453                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1454                         goto regen;
1455         }
1456
1457         return 0;
1458 }
1459
1460 static void ipv6_regen_rndid(unsigned long data)
1461 {
1462         struct inet6_dev *idev = (struct inet6_dev *) data;
1463         unsigned long expires;
1464
1465         read_lock_bh(&addrconf_lock);
1466         write_lock_bh(&idev->lock);
1467
1468         if (idev->dead)
1469                 goto out;
1470
1471         if (__ipv6_regen_rndid(idev) < 0)
1472                 goto out;
1473
1474         expires = jiffies +
1475                 idev->cnf.temp_prefered_lft * HZ -
1476                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1477         if (time_before(expires, jiffies)) {
1478                 printk(KERN_WARNING
1479                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1480                         idev->dev->name);
1481                 goto out;
1482         }
1483
1484         if (!mod_timer(&idev->regen_timer, expires))
1485                 in6_dev_hold(idev);
1486
1487 out:
1488         write_unlock_bh(&idev->lock);
1489         read_unlock_bh(&addrconf_lock);
1490         in6_dev_put(idev);
1491 }
1492
1493 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1494         int ret = 0;
1495
1496         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1497                 ret = __ipv6_regen_rndid(idev);
1498         return ret;
1499 }
1500 #endif
1501
1502 /*
1503  *      Add prefix route.
1504  */
1505
1506 static void
1507 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1508                       unsigned long expires, u32 flags)
1509 {
1510         struct in6_rtmsg rtmsg;
1511
1512         memset(&rtmsg, 0, sizeof(rtmsg));
1513         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1514         rtmsg.rtmsg_dst_len = plen;
1515         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1516         rtmsg.rtmsg_ifindex = dev->ifindex;
1517         rtmsg.rtmsg_info = expires;
1518         rtmsg.rtmsg_flags = RTF_UP|flags;
1519         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1520
1521         /* Prevent useless cloning on PtP SIT.
1522            This thing is done here expecting that the whole
1523            class of non-broadcast devices need not cloning.
1524          */
1525         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1526                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1527
1528         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1529 }
1530
1531 /* Create "default" multicast route to the interface */
1532
1533 static void addrconf_add_mroute(struct net_device *dev)
1534 {
1535         struct in6_rtmsg rtmsg;
1536
1537         memset(&rtmsg, 0, sizeof(rtmsg));
1538         ipv6_addr_set(&rtmsg.rtmsg_dst,
1539                       htonl(0xFF000000), 0, 0, 0);
1540         rtmsg.rtmsg_dst_len = 8;
1541         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1542         rtmsg.rtmsg_ifindex = dev->ifindex;
1543         rtmsg.rtmsg_flags = RTF_UP;
1544         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1545         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1546 }
1547
1548 static void sit_route_add(struct net_device *dev)
1549 {
1550         struct in6_rtmsg rtmsg;
1551
1552         memset(&rtmsg, 0, sizeof(rtmsg));
1553
1554         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1555         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1556
1557         /* prefix length - 96 bits "::d.d.d.d" */
1558         rtmsg.rtmsg_dst_len     = 96;
1559         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1560         rtmsg.rtmsg_ifindex     = dev->ifindex;
1561
1562         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1563 }
1564
1565 static void addrconf_add_lroute(struct net_device *dev)
1566 {
1567         struct in6_addr addr;
1568
1569         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1570         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1571 }
1572
1573 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1574 {
1575         struct inet6_dev *idev;
1576
1577         ASSERT_RTNL();
1578
1579         if ((idev = ipv6_find_idev(dev)) == NULL)
1580                 return NULL;
1581
1582         /* Add default multicast route */
1583         addrconf_add_mroute(dev);
1584
1585         /* Add link local route */
1586         addrconf_add_lroute(dev);
1587         return idev;
1588 }
1589
1590 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1591 {
1592         struct prefix_info *pinfo;
1593         __u32 valid_lft;
1594         __u32 prefered_lft;
1595         int addr_type;
1596         unsigned long rt_expires;
1597         struct inet6_dev *in6_dev;
1598
1599         pinfo = (struct prefix_info *) opt;
1600
1601         if (len < sizeof(struct prefix_info)) {
1602                 ADBG(("addrconf: prefix option too short\n"));
1603                 return;
1604         }
1605
1606         /*
1607          *      Validation checks ([ADDRCONF], page 19)
1608          */
1609
1610         addr_type = ipv6_addr_type(&pinfo->prefix);
1611
1612         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1613                 return;
1614
1615         valid_lft = ntohl(pinfo->valid);
1616         prefered_lft = ntohl(pinfo->prefered);
1617
1618         if (prefered_lft > valid_lft) {
1619                 if (net_ratelimit())
1620                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1621                 return;
1622         }
1623
1624         in6_dev = in6_dev_get(dev);
1625
1626         if (in6_dev == NULL) {
1627                 if (net_ratelimit())
1628                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1629                 return;
1630         }
1631
1632         /*
1633          *      Two things going on here:
1634          *      1) Add routes for on-link prefixes
1635          *      2) Configure prefixes with the auto flag set
1636          */
1637
1638         /* Avoid arithmetic overflow. Really, we could
1639            save rt_expires in seconds, likely valid_lft,
1640            but it would require division in fib gc, that it
1641            not good.
1642          */
1643         if (valid_lft >= 0x7FFFFFFF/HZ)
1644                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1645         else
1646                 rt_expires = valid_lft * HZ;
1647
1648         /*
1649          * We convert this (in jiffies) to clock_t later.
1650          * Avoid arithmetic overflow there as well.
1651          * Overflow can happen only if HZ < USER_HZ.
1652          */
1653         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1654                 rt_expires = 0x7FFFFFFF / USER_HZ;
1655
1656         if (pinfo->onlink) {
1657                 struct rt6_info *rt;
1658                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1659
1660                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1661                         if (rt->rt6i_flags&RTF_EXPIRES) {
1662                                 if (valid_lft == 0) {
1663                                         ip6_del_rt(rt, NULL, NULL, NULL);
1664                                         rt = NULL;
1665                                 } else {
1666                                         rt->rt6i_expires = jiffies + rt_expires;
1667                                 }
1668                         }
1669                 } else if (valid_lft) {
1670                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1671                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1672                 }
1673                 if (rt)
1674                         dst_release(&rt->u.dst);
1675         }
1676
1677         /* Try to figure out our local address for this prefix */
1678
1679         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1680                 struct inet6_ifaddr * ifp;
1681                 struct in6_addr addr;
1682                 int create = 0, update_lft = 0;
1683
1684                 if (pinfo->prefix_len == 64) {
1685                         memcpy(&addr, &pinfo->prefix, 8);
1686                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1687                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1688                                 in6_dev_put(in6_dev);
1689                                 return;
1690                         }
1691                         goto ok;
1692                 }
1693                 if (net_ratelimit())
1694                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1695                                pinfo->prefix_len);
1696                 in6_dev_put(in6_dev);
1697                 return;
1698
1699 ok:
1700
1701                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1702
1703                 if (ifp == NULL && valid_lft) {
1704                         int max_addresses = in6_dev->cnf.max_addresses;
1705
1706                         /* Do not allow to create too much of autoconfigured
1707                          * addresses; this would be too easy way to crash kernel.
1708                          */
1709                         if (!max_addresses ||
1710                             ipv6_count_addresses(in6_dev) < max_addresses)
1711                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1712                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1713
1714                         if (!ifp || IS_ERR(ifp)) {
1715                                 in6_dev_put(in6_dev);
1716                                 return;
1717                         }
1718
1719                         update_lft = create = 1;
1720                         ifp->cstamp = jiffies;
1721                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1722                 }
1723
1724                 if (ifp) {
1725                         int flags;
1726                         unsigned long now;
1727 #ifdef CONFIG_IPV6_PRIVACY
1728                         struct inet6_ifaddr *ift;
1729 #endif
1730                         u32 stored_lft;
1731
1732                         /* update lifetime (RFC2462 5.5.3 e) */
1733                         spin_lock(&ifp->lock);
1734                         now = jiffies;
1735                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1736                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1737                         else
1738                                 stored_lft = 0;
1739                         if (!update_lft && stored_lft) {
1740                                 if (valid_lft > MIN_VALID_LIFETIME ||
1741                                     valid_lft > stored_lft)
1742                                         update_lft = 1;
1743                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1744                                         /* valid_lft <= stored_lft is always true */
1745                                         /* XXX: IPsec */
1746                                         update_lft = 0;
1747                                 } else {
1748                                         valid_lft = MIN_VALID_LIFETIME;
1749                                         if (valid_lft < prefered_lft)
1750                                                 prefered_lft = valid_lft;
1751                                         update_lft = 1;
1752                                 }
1753                         }
1754
1755                         if (update_lft) {
1756                                 ifp->valid_lft = valid_lft;
1757                                 ifp->prefered_lft = prefered_lft;
1758                                 ifp->tstamp = now;
1759                                 flags = ifp->flags;
1760                                 ifp->flags &= ~IFA_F_DEPRECATED;
1761                                 spin_unlock(&ifp->lock);
1762
1763                                 if (!(flags&IFA_F_TENTATIVE))
1764                                         ipv6_ifa_notify(0, ifp);
1765                         } else
1766                                 spin_unlock(&ifp->lock);
1767
1768 #ifdef CONFIG_IPV6_PRIVACY
1769                         read_lock_bh(&in6_dev->lock);
1770                         /* update all temporary addresses in the list */
1771                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1772                                 /*
1773                                  * When adjusting the lifetimes of an existing
1774                                  * temporary address, only lower the lifetimes.
1775                                  * Implementations must not increase the
1776                                  * lifetimes of an existing temporary address
1777                                  * when processing a Prefix Information Option.
1778                                  */
1779                                 spin_lock(&ift->lock);
1780                                 flags = ift->flags;
1781                                 if (ift->valid_lft > valid_lft &&
1782                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1783                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1784                                 if (ift->prefered_lft > prefered_lft &&
1785                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1786                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1787                                 spin_unlock(&ift->lock);
1788                                 if (!(flags&IFA_F_TENTATIVE))
1789                                         ipv6_ifa_notify(0, ift);
1790                         }
1791
1792                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1793                                 /*
1794                                  * When a new public address is created as described in [ADDRCONF],
1795                                  * also create a new temporary address.
1796                                  */
1797                                 read_unlock_bh(&in6_dev->lock);
1798                                 ipv6_create_tempaddr(ifp, NULL);
1799                         } else {
1800                                 read_unlock_bh(&in6_dev->lock);
1801                         }
1802 #endif
1803                         in6_ifa_put(ifp);
1804                         addrconf_verify(0);
1805                 }
1806         }
1807         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1808         in6_dev_put(in6_dev);
1809 }
1810
1811 /*
1812  *      Set destination address.
1813  *      Special case for SIT interfaces where we create a new "virtual"
1814  *      device.
1815  */
1816 int addrconf_set_dstaddr(void __user *arg)
1817 {
1818         struct in6_ifreq ireq;
1819         struct net_device *dev;
1820         int err = -EINVAL;
1821
1822         rtnl_lock();
1823
1824         err = -EFAULT;
1825         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1826                 goto err_exit;
1827
1828         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1829
1830         err = -ENODEV;
1831         if (dev == NULL)
1832                 goto err_exit;
1833
1834         if (dev->type == ARPHRD_SIT) {
1835                 struct ifreq ifr;
1836                 mm_segment_t    oldfs;
1837                 struct ip_tunnel_parm p;
1838
1839                 err = -EADDRNOTAVAIL;
1840                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1841                         goto err_exit;
1842
1843                 memset(&p, 0, sizeof(p));
1844                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1845                 p.iph.saddr = 0;
1846                 p.iph.version = 4;
1847                 p.iph.ihl = 5;
1848                 p.iph.protocol = IPPROTO_IPV6;
1849                 p.iph.ttl = 64;
1850                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1851
1852                 oldfs = get_fs(); set_fs(KERNEL_DS);
1853                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1854                 set_fs(oldfs);
1855
1856                 if (err == 0) {
1857                         err = -ENOBUFS;
1858                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1859                                 goto err_exit;
1860                         err = dev_open(dev);
1861                 }
1862         }
1863
1864 err_exit:
1865         rtnl_unlock();
1866         return err;
1867 }
1868
1869 /*
1870  *      Manual configuration of address on an interface
1871  */
1872 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1873                           __u32 prefered_lft, __u32 valid_lft)
1874 {
1875         struct inet6_ifaddr *ifp;
1876         struct inet6_dev *idev;
1877         struct net_device *dev;
1878         __u8 ifa_flags = 0;
1879         int scope;
1880
1881         ASSERT_RTNL();
1882
1883         /* check the lifetime */
1884         if (!valid_lft || prefered_lft > valid_lft)
1885                 return -EINVAL;
1886
1887         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1888                 return -ENODEV;
1889
1890         if (!(dev->flags&IFF_UP))
1891                 return -ENETDOWN;
1892
1893         if ((idev = addrconf_add_dev(dev)) == NULL)
1894                 return -ENOBUFS;
1895
1896         scope = ipv6_addr_scope(pfx);
1897
1898         if (valid_lft == INFINITY_LIFE_TIME)
1899                 ifa_flags |= IFA_F_PERMANENT;
1900         else if (valid_lft >= 0x7FFFFFFF/HZ)
1901                 valid_lft = 0x7FFFFFFF/HZ;
1902
1903         if (prefered_lft == 0)
1904                 ifa_flags |= IFA_F_DEPRECATED;
1905         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1906                  (prefered_lft != INFINITY_LIFE_TIME))
1907                 prefered_lft = 0x7FFFFFFF/HZ;
1908
1909         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1910
1911         if (!IS_ERR(ifp)) {
1912                 spin_lock(&ifp->lock);
1913                 ifp->valid_lft = valid_lft;
1914                 ifp->prefered_lft = prefered_lft;
1915                 ifp->tstamp = jiffies;
1916                 spin_unlock(&ifp->lock);
1917
1918                 addrconf_dad_start(ifp, 0);
1919                 in6_ifa_put(ifp);
1920                 addrconf_verify(0);
1921                 return 0;
1922         }
1923
1924         return PTR_ERR(ifp);
1925 }
1926
1927 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1928 {
1929         struct inet6_ifaddr *ifp;
1930         struct inet6_dev *idev;
1931         struct net_device *dev;
1932
1933         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1934                 return -ENODEV;
1935
1936         if ((idev = __in6_dev_get(dev)) == NULL)
1937                 return -ENXIO;
1938
1939         read_lock_bh(&idev->lock);
1940         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1941                 if (ifp->prefix_len == plen &&
1942                     ipv6_addr_equal(pfx, &ifp->addr)) {
1943                         in6_ifa_hold(ifp);
1944                         read_unlock_bh(&idev->lock);
1945
1946                         ipv6_del_addr(ifp);
1947
1948                         /* If the last address is deleted administratively,
1949                            disable IPv6 on this interface.
1950                          */
1951                         if (idev->addr_list == NULL)
1952                                 addrconf_ifdown(idev->dev, 1);
1953                         return 0;
1954                 }
1955         }
1956         read_unlock_bh(&idev->lock);
1957         return -EADDRNOTAVAIL;
1958 }
1959
1960
1961 int addrconf_add_ifaddr(void __user *arg)
1962 {
1963         struct in6_ifreq ireq;
1964         int err;
1965
1966         if (!capable(CAP_NET_ADMIN))
1967                 return -EPERM;
1968
1969         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1970                 return -EFAULT;
1971
1972         rtnl_lock();
1973         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1974                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1975         rtnl_unlock();
1976         return err;
1977 }
1978
1979 int addrconf_del_ifaddr(void __user *arg)
1980 {
1981         struct in6_ifreq ireq;
1982         int err;
1983
1984         if (!capable(CAP_NET_ADMIN))
1985                 return -EPERM;
1986
1987         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1988                 return -EFAULT;
1989
1990         rtnl_lock();
1991         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1992         rtnl_unlock();
1993         return err;
1994 }
1995
1996 static void sit_add_v4_addrs(struct inet6_dev *idev)
1997 {
1998         struct inet6_ifaddr * ifp;
1999         struct in6_addr addr;
2000         struct net_device *dev;
2001         int scope;
2002
2003         ASSERT_RTNL();
2004
2005         memset(&addr, 0, sizeof(struct in6_addr));
2006         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2007
2008         if (idev->dev->flags&IFF_POINTOPOINT) {
2009                 addr.s6_addr32[0] = htonl(0xfe800000);
2010                 scope = IFA_LINK;
2011         } else {
2012                 scope = IPV6_ADDR_COMPATv4;
2013         }
2014
2015         if (addr.s6_addr32[3]) {
2016                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2017                 if (!IS_ERR(ifp)) {
2018                         spin_lock_bh(&ifp->lock);
2019                         ifp->flags &= ~IFA_F_TENTATIVE;
2020                         spin_unlock_bh(&ifp->lock);
2021                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2022                         in6_ifa_put(ifp);
2023                 }
2024                 return;
2025         }
2026
2027         for (dev = dev_base; dev != NULL; dev = dev->next) {
2028                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2029                 if (in_dev && (dev->flags & IFF_UP)) {
2030                         struct in_ifaddr * ifa;
2031
2032                         int flag = scope;
2033
2034                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2035                                 int plen;
2036
2037                                 addr.s6_addr32[3] = ifa->ifa_local;
2038
2039                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2040                                         continue;
2041                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2042                                         if (idev->dev->flags&IFF_POINTOPOINT)
2043                                                 continue;
2044                                         flag |= IFA_HOST;
2045                                 }
2046                                 if (idev->dev->flags&IFF_POINTOPOINT)
2047                                         plen = 64;
2048                                 else
2049                                         plen = 96;
2050
2051                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2052                                                     IFA_F_PERMANENT);
2053                                 if (!IS_ERR(ifp)) {
2054                                         spin_lock_bh(&ifp->lock);
2055                                         ifp->flags &= ~IFA_F_TENTATIVE;
2056                                         spin_unlock_bh(&ifp->lock);
2057                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2058                                         in6_ifa_put(ifp);
2059                                 }
2060                         }
2061                 }
2062         }
2063 }
2064
2065 static void init_loopback(struct net_device *dev)
2066 {
2067         struct inet6_dev  *idev;
2068         struct inet6_ifaddr * ifp;
2069
2070         /* ::1 */
2071
2072         ASSERT_RTNL();
2073
2074         if ((idev = ipv6_find_idev(dev)) == NULL) {
2075                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2076                 return;
2077         }
2078
2079         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2080         if (!IS_ERR(ifp)) {
2081                 spin_lock_bh(&ifp->lock);
2082                 ifp->flags &= ~IFA_F_TENTATIVE;
2083                 spin_unlock_bh(&ifp->lock);
2084                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2085                 in6_ifa_put(ifp);
2086         }
2087 }
2088
2089 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2090 {
2091         struct inet6_ifaddr * ifp;
2092
2093         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2094         if (!IS_ERR(ifp)) {
2095                 addrconf_dad_start(ifp, 0);
2096                 in6_ifa_put(ifp);
2097         }
2098 }
2099
2100 static void addrconf_dev_config(struct net_device *dev)
2101 {
2102         struct in6_addr addr;
2103         struct inet6_dev    * idev;
2104
2105         ASSERT_RTNL();
2106
2107         if ((dev->type != ARPHRD_ETHER) &&
2108             (dev->type != ARPHRD_FDDI) &&
2109             (dev->type != ARPHRD_IEEE802_TR) &&
2110             (dev->type != ARPHRD_ARCNET) &&
2111             (dev->type != ARPHRD_INFINIBAND)) {
2112                 /* Alas, we support only Ethernet autoconfiguration. */
2113                 return;
2114         }
2115
2116         idev = addrconf_add_dev(dev);
2117         if (idev == NULL)
2118                 return;
2119
2120         memset(&addr, 0, sizeof(struct in6_addr));
2121         addr.s6_addr32[0] = htonl(0xFE800000);
2122
2123         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2124                 addrconf_add_linklocal(idev, &addr);
2125 }
2126
2127 static void addrconf_sit_config(struct net_device *dev)
2128 {
2129         struct inet6_dev *idev;
2130
2131         ASSERT_RTNL();
2132
2133         /*
2134          * Configure the tunnel with one of our IPv4
2135          * addresses... we should configure all of
2136          * our v4 addrs in the tunnel
2137          */
2138
2139         if ((idev = ipv6_find_idev(dev)) == NULL) {
2140                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2141                 return;
2142         }
2143
2144         sit_add_v4_addrs(idev);
2145
2146         if (dev->flags&IFF_POINTOPOINT) {
2147                 addrconf_add_mroute(dev);
2148                 addrconf_add_lroute(dev);
2149         } else
2150                 sit_route_add(dev);
2151 }
2152
2153 static inline int
2154 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2155 {
2156         struct in6_addr lladdr;
2157
2158         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2159                 addrconf_add_linklocal(idev, &lladdr);
2160                 return 0;
2161         }
2162         return -1;
2163 }
2164
2165 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2166 {
2167         struct net_device *link_dev;
2168
2169         /* first try to inherit the link-local address from the link device */
2170         if (idev->dev->iflink &&
2171             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2172                 if (!ipv6_inherit_linklocal(idev, link_dev))
2173                         return;
2174         }
2175         /* then try to inherit it from any device */
2176         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2177                 if (!ipv6_inherit_linklocal(idev, link_dev))
2178                         return;
2179         }
2180         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2181 }
2182
2183 /*
2184  * Autoconfigure tunnel with a link-local address so routing protocols,
2185  * DHCPv6, MLD etc. can be run over the virtual link
2186  */
2187
2188 static void addrconf_ip6_tnl_config(struct net_device *dev)
2189 {
2190         struct inet6_dev *idev;
2191
2192         ASSERT_RTNL();
2193
2194         if ((idev = addrconf_add_dev(dev)) == NULL) {
2195                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2196                 return;
2197         }
2198         ip6_tnl_add_linklocal(idev);
2199 }
2200
2201 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2202                            void * data)
2203 {
2204         struct net_device *dev = (struct net_device *) data;
2205         struct inet6_dev *idev = __in6_dev_get(dev);
2206         int run_pending = 0;
2207
2208         switch(event) {
2209         case NETDEV_UP:
2210         case NETDEV_CHANGE:
2211                 if (event == NETDEV_UP) {
2212                         if (!netif_carrier_ok(dev)) {
2213                                 /* device is not ready yet. */
2214                                 printk(KERN_INFO
2215                                         "ADDRCONF(NETDEV_UP): %s: "
2216                                         "link is not ready\n",
2217                                         dev->name);
2218                                 break;
2219                         }
2220
2221                         if (idev)
2222                                 idev->if_flags |= IF_READY;
2223                 } else {
2224                         if (!netif_carrier_ok(dev)) {
2225                                 /* device is still not ready. */
2226                                 break;
2227                         }
2228
2229                         if (idev) {
2230                                 if (idev->if_flags & IF_READY) {
2231                                         /* device is already configured. */
2232                                         break;
2233                                 }
2234                                 idev->if_flags |= IF_READY;
2235                         }
2236
2237                         printk(KERN_INFO
2238                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2239                                         "link becomes ready\n",
2240                                         dev->name);
2241
2242                         run_pending = 1;
2243                 }
2244
2245                 switch(dev->type) {
2246                 case ARPHRD_SIT:
2247                         addrconf_sit_config(dev);
2248                         break;
2249                 case ARPHRD_TUNNEL6:
2250                         addrconf_ip6_tnl_config(dev);
2251                         break;
2252                 case ARPHRD_LOOPBACK:
2253                         init_loopback(dev);
2254                         break;
2255
2256                 default:
2257                         addrconf_dev_config(dev);
2258                         break;
2259                 };
2260                 if (idev) {
2261                         if (run_pending)
2262                                 addrconf_dad_run(idev);
2263
2264                         /* If the MTU changed during the interface down, when the
2265                            interface up, the changed MTU must be reflected in the
2266                            idev as well as routers.
2267                          */
2268                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2269                                 rt6_mtu_change(dev, dev->mtu);
2270                                 idev->cnf.mtu6 = dev->mtu;
2271                         }
2272                         idev->tstamp = jiffies;
2273                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2274                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2275                            stop IPv6 on this interface.
2276                          */
2277                         if (dev->mtu < IPV6_MIN_MTU)
2278                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2279                 }
2280                 break;
2281
2282         case NETDEV_CHANGEMTU:
2283                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2284                         rt6_mtu_change(dev, dev->mtu);
2285                         idev->cnf.mtu6 = dev->mtu;
2286                         break;
2287                 }
2288
2289                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2290
2291         case NETDEV_DOWN:
2292         case NETDEV_UNREGISTER:
2293                 /*
2294                  *      Remove all addresses from this interface.
2295                  */
2296                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2297                 break;
2298
2299         case NETDEV_CHANGENAME:
2300 #ifdef CONFIG_SYSCTL
2301                 if (idev) {
2302                         addrconf_sysctl_unregister(&idev->cnf);
2303                         neigh_sysctl_unregister(idev->nd_parms);
2304                         neigh_sysctl_register(dev, idev->nd_parms,
2305                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2306                                               &ndisc_ifinfo_sysctl_change,
2307                                               NULL);
2308                         addrconf_sysctl_register(idev, &idev->cnf);
2309                 }
2310 #endif
2311                 break;
2312         };
2313
2314         return NOTIFY_OK;
2315 }
2316
2317 /*
2318  *      addrconf module should be notified of a device going up
2319  */
2320 static struct notifier_block ipv6_dev_notf = {
2321         .notifier_call = addrconf_notify,
2322         .priority = 0
2323 };
2324
2325 static int addrconf_ifdown(struct net_device *dev, int how)
2326 {
2327         struct inet6_dev *idev;
2328         struct inet6_ifaddr *ifa, **bifa;
2329         int i;
2330
2331         ASSERT_RTNL();
2332
2333         if (dev == &loopback_dev && how == 1)
2334                 how = 0;
2335
2336         rt6_ifdown(dev);
2337         neigh_ifdown(&nd_tbl, dev);
2338
2339         idev = __in6_dev_get(dev);
2340         if (idev == NULL)
2341                 return -ENODEV;
2342
2343         /* Step 1: remove reference to ipv6 device from parent device.
2344                    Do not dev_put!
2345          */
2346         if (how == 1) {
2347                 write_lock_bh(&addrconf_lock);
2348                 dev->ip6_ptr = NULL;
2349                 idev->dead = 1;
2350                 write_unlock_bh(&addrconf_lock);
2351
2352                 /* Step 1.5: remove snmp6 entry */
2353                 snmp6_unregister_dev(idev);
2354
2355         }
2356
2357         /* Step 2: clear hash table */
2358         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2359                 bifa = &inet6_addr_lst[i];
2360
2361                 write_lock_bh(&addrconf_hash_lock);
2362                 while ((ifa = *bifa) != NULL) {
2363                         if (ifa->idev == idev) {
2364                                 *bifa = ifa->lst_next;
2365                                 ifa->lst_next = NULL;
2366                                 addrconf_del_timer(ifa);
2367                                 in6_ifa_put(ifa);
2368                                 continue;
2369                         }
2370                         bifa = &ifa->lst_next;
2371                 }
2372                 write_unlock_bh(&addrconf_hash_lock);
2373         }
2374
2375         write_lock_bh(&idev->lock);
2376
2377         /* Step 3: clear flags for stateless addrconf */
2378         if (how != 1)
2379                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2380
2381         /* Step 4: clear address list */
2382 #ifdef CONFIG_IPV6_PRIVACY
2383         if (how == 1 && del_timer(&idev->regen_timer))
2384                 in6_dev_put(idev);
2385
2386         /* clear tempaddr list */
2387         while ((ifa = idev->tempaddr_list) != NULL) {
2388                 idev->tempaddr_list = ifa->tmp_next;
2389                 ifa->tmp_next = NULL;
2390                 ifa->dead = 1;
2391                 write_unlock_bh(&idev->lock);
2392                 spin_lock_bh(&ifa->lock);
2393
2394                 if (ifa->ifpub) {
2395                         in6_ifa_put(ifa->ifpub);
2396                         ifa->ifpub = NULL;
2397                 }
2398                 spin_unlock_bh(&ifa->lock);
2399                 in6_ifa_put(ifa);
2400                 write_lock_bh(&idev->lock);
2401         }
2402 #endif
2403         while ((ifa = idev->addr_list) != NULL) {
2404                 idev->addr_list = ifa->if_next;
2405                 ifa->if_next = NULL;
2406                 ifa->dead = 1;
2407                 addrconf_del_timer(ifa);
2408                 write_unlock_bh(&idev->lock);
2409
2410                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2411                 in6_ifa_put(ifa);
2412
2413                 write_lock_bh(&idev->lock);
2414         }
2415         write_unlock_bh(&idev->lock);
2416
2417         /* Step 5: Discard multicast list */
2418
2419         if (how == 1)
2420                 ipv6_mc_destroy_dev(idev);
2421         else
2422                 ipv6_mc_down(idev);
2423
2424         /* Step 5: netlink notification of this interface */
2425         idev->tstamp = jiffies;
2426         inet6_ifinfo_notify(RTM_DELLINK, idev);
2427
2428         /* Shot the device (if unregistered) */
2429
2430         if (how == 1) {
2431 #ifdef CONFIG_SYSCTL
2432                 addrconf_sysctl_unregister(&idev->cnf);
2433                 neigh_sysctl_unregister(idev->nd_parms);
2434 #endif
2435                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2436                 neigh_ifdown(&nd_tbl, dev);
2437                 in6_dev_put(idev);
2438         }
2439         return 0;
2440 }
2441
2442 static void addrconf_rs_timer(unsigned long data)
2443 {
2444         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2445
2446         if (ifp->idev->cnf.forwarding)
2447                 goto out;
2448
2449         if (ifp->idev->if_flags & IF_RA_RCVD) {
2450                 /*
2451                  *      Announcement received after solicitation
2452                  *      was sent
2453                  */
2454                 goto out;
2455         }
2456
2457         spin_lock(&ifp->lock);
2458         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2459                 struct in6_addr all_routers;
2460
2461                 /* The wait after the last probe can be shorter */
2462                 addrconf_mod_timer(ifp, AC_RS,
2463                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2464                                    ifp->idev->cnf.rtr_solicit_delay :
2465                                    ifp->idev->cnf.rtr_solicit_interval);
2466                 spin_unlock(&ifp->lock);
2467
2468                 ipv6_addr_all_routers(&all_routers);
2469
2470                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2471         } else {
2472                 spin_unlock(&ifp->lock);
2473                 /*
2474                  * Note: we do not support deprecated "all on-link"
2475                  * assumption any longer.
2476                  */
2477                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2478                        ifp->idev->dev->name);
2479         }
2480
2481 out:
2482         in6_ifa_put(ifp);
2483 }
2484
2485 /*
2486  *      Duplicate Address Detection
2487  */
2488 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2489 {
2490         unsigned long rand_num;
2491         struct inet6_dev *idev = ifp->idev;
2492
2493         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2494         ifp->probes = idev->cnf.dad_transmits;
2495         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2496 }
2497
2498 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2499 {
2500         struct inet6_dev *idev = ifp->idev;
2501         struct net_device *dev = idev->dev;
2502
2503         addrconf_join_solict(dev, &ifp->addr);
2504
2505         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2506                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2507                                         flags);
2508
2509         net_srandom(ifp->addr.s6_addr32[3]);
2510
2511         read_lock_bh(&idev->lock);
2512         if (ifp->dead)
2513                 goto out;
2514         spin_lock_bh(&ifp->lock);
2515
2516         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2517             !(ifp->flags&IFA_F_TENTATIVE)) {
2518                 ifp->flags &= ~IFA_F_TENTATIVE;
2519                 spin_unlock_bh(&ifp->lock);
2520                 read_unlock_bh(&idev->lock);
2521
2522                 addrconf_dad_completed(ifp);
2523                 return;
2524         }
2525
2526         if (!(idev->if_flags & IF_READY)) {
2527                 spin_unlock_bh(&ifp->lock);
2528                 read_unlock_bh(&idev->lock);
2529                 /*
2530                  * If the defice is not ready:
2531                  * - keep it tentative if it is a permanent address.
2532                  * - otherwise, kill it.
2533                  */
2534                 in6_ifa_hold(ifp);
2535                 addrconf_dad_stop(ifp);
2536                 return;
2537         }
2538         addrconf_dad_kick(ifp);
2539         spin_unlock_bh(&ifp->lock);
2540 out:
2541         read_unlock_bh(&idev->lock);
2542 }
2543
2544 static void addrconf_dad_timer(unsigned long data)
2545 {
2546         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2547         struct inet6_dev *idev = ifp->idev;
2548         struct in6_addr unspec;
2549         struct in6_addr mcaddr;
2550
2551         read_lock_bh(&idev->lock);
2552         if (idev->dead) {
2553                 read_unlock_bh(&idev->lock);
2554                 goto out;
2555         }
2556         spin_lock_bh(&ifp->lock);
2557         if (ifp->probes == 0) {
2558                 /*
2559                  * DAD was successful
2560                  */
2561
2562                 ifp->flags &= ~IFA_F_TENTATIVE;
2563                 spin_unlock_bh(&ifp->lock);
2564                 read_unlock_bh(&idev->lock);
2565
2566                 addrconf_dad_completed(ifp);
2567
2568                 goto out;
2569         }
2570
2571         ifp->probes--;
2572         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2573         spin_unlock_bh(&ifp->lock);
2574         read_unlock_bh(&idev->lock);
2575
2576         /* send a neighbour solicitation for our addr */
2577         memset(&unspec, 0, sizeof(unspec));
2578         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2579         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2580 out:
2581         in6_ifa_put(ifp);
2582 }
2583
2584 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2585 {
2586         struct net_device *     dev = ifp->idev->dev;
2587
2588         /*
2589          *      Configure the address for reception. Now it is valid.
2590          */
2591
2592         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2593
2594         /* If added prefix is link local and forwarding is off,
2595            start sending router solicitations.
2596          */
2597
2598         if (ifp->idev->cnf.forwarding == 0 &&
2599             ifp->idev->cnf.rtr_solicits > 0 &&
2600             (dev->flags&IFF_LOOPBACK) == 0 &&
2601             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2602                 struct in6_addr all_routers;
2603
2604                 ipv6_addr_all_routers(&all_routers);
2605
2606                 /*
2607                  *      If a host as already performed a random delay
2608                  *      [...] as part of DAD [...] there is no need
2609                  *      to delay again before sending the first RS
2610                  */
2611                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2612
2613                 spin_lock_bh(&ifp->lock);
2614                 ifp->probes = 1;
2615                 ifp->idev->if_flags |= IF_RS_SENT;
2616                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2617                 spin_unlock_bh(&ifp->lock);
2618         }
2619 }
2620
2621 static void addrconf_dad_run(struct inet6_dev *idev) {
2622         struct inet6_ifaddr *ifp;
2623
2624         read_lock_bh(&idev->lock);
2625         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2626                 spin_lock_bh(&ifp->lock);
2627                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2628                         spin_unlock_bh(&ifp->lock);
2629                         continue;
2630                 }
2631                 spin_unlock_bh(&ifp->lock);
2632                 addrconf_dad_kick(ifp);
2633         }
2634         read_unlock_bh(&idev->lock);
2635 }
2636
2637 #ifdef CONFIG_PROC_FS
2638 struct if6_iter_state {
2639         int bucket;
2640 };
2641
2642 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2643 {
2644         struct inet6_ifaddr *ifa = NULL;
2645         struct if6_iter_state *state = seq->private;
2646
2647         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2648                 ifa = inet6_addr_lst[state->bucket];
2649                 if (ifa)
2650                         break;
2651         }
2652         return ifa;
2653 }
2654
2655 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2656 {
2657         struct if6_iter_state *state = seq->private;
2658
2659         ifa = ifa->lst_next;
2660 try_again:
2661         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2662                 ifa = inet6_addr_lst[state->bucket];
2663                 goto try_again;
2664         }
2665         return ifa;
2666 }
2667
2668 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2669 {
2670         struct inet6_ifaddr *ifa = if6_get_first(seq);
2671
2672         if (ifa)
2673                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2674                         --pos;
2675         return pos ? NULL : ifa;
2676 }
2677
2678 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2679 {
2680         read_lock_bh(&addrconf_hash_lock);
2681         return if6_get_idx(seq, *pos);
2682 }
2683
2684 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2685 {
2686         struct inet6_ifaddr *ifa;
2687
2688         ifa = if6_get_next(seq, v);
2689         ++*pos;
2690         return ifa;
2691 }
2692
2693 static void if6_seq_stop(struct seq_file *seq, void *v)
2694 {
2695         read_unlock_bh(&addrconf_hash_lock);
2696 }
2697
2698 static int if6_seq_show(struct seq_file *seq, void *v)
2699 {
2700         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2701         seq_printf(seq,
2702                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2703                    NIP6(ifp->addr),
2704                    ifp->idev->dev->ifindex,
2705                    ifp->prefix_len,
2706                    ifp->scope,
2707                    ifp->flags,
2708                    ifp->idev->dev->name);
2709         return 0;
2710 }
2711
2712 static struct seq_operations if6_seq_ops = {
2713         .start  = if6_seq_start,
2714         .next   = if6_seq_next,
2715         .show   = if6_seq_show,
2716         .stop   = if6_seq_stop,
2717 };
2718
2719 static int if6_seq_open(struct inode *inode, struct file *file)
2720 {
2721         struct seq_file *seq;
2722         int rc = -ENOMEM;
2723         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2724
2725         if (!s)
2726                 goto out;
2727
2728         rc = seq_open(file, &if6_seq_ops);
2729         if (rc)
2730                 goto out_kfree;
2731
2732         seq = file->private_data;
2733         seq->private = s;
2734 out:
2735         return rc;
2736 out_kfree:
2737         kfree(s);
2738         goto out;
2739 }
2740
2741 static struct file_operations if6_fops = {
2742         .owner          = THIS_MODULE,
2743         .open           = if6_seq_open,
2744         .read           = seq_read,
2745         .llseek         = seq_lseek,
2746         .release        = seq_release_private,
2747 };
2748
2749 int __init if6_proc_init(void)
2750 {
2751         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2752                 return -ENOMEM;
2753         return 0;
2754 }
2755
2756 void if6_proc_exit(void)
2757 {
2758         proc_net_remove("if_inet6");
2759 }
2760 #endif  /* CONFIG_PROC_FS */
2761
2762 /*
2763  *      Periodic address status verification
2764  */
2765
2766 static void addrconf_verify(unsigned long foo)
2767 {
2768         struct inet6_ifaddr *ifp;
2769         unsigned long now, next;
2770         int i;
2771
2772         spin_lock_bh(&addrconf_verify_lock);
2773         now = jiffies;
2774         next = now + ADDR_CHECK_FREQUENCY;
2775
2776         del_timer(&addr_chk_timer);
2777
2778         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2779
2780 restart:
2781                 read_lock(&addrconf_hash_lock);
2782                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2783                         unsigned long age;
2784 #ifdef CONFIG_IPV6_PRIVACY
2785                         unsigned long regen_advance;
2786 #endif
2787
2788                         if (ifp->flags & IFA_F_PERMANENT)
2789                                 continue;
2790
2791                         spin_lock(&ifp->lock);
2792                         age = (now - ifp->tstamp) / HZ;
2793
2794 #ifdef CONFIG_IPV6_PRIVACY
2795                         regen_advance = ifp->idev->cnf.regen_max_retry *
2796                                         ifp->idev->cnf.dad_transmits *
2797                                         ifp->idev->nd_parms->retrans_time / HZ;
2798 #endif
2799
2800                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2801                             age >= ifp->valid_lft) {
2802                                 spin_unlock(&ifp->lock);
2803                                 in6_ifa_hold(ifp);
2804                                 read_unlock(&addrconf_hash_lock);
2805                                 ipv6_del_addr(ifp);
2806                                 goto restart;
2807                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2808                                 spin_unlock(&ifp->lock);
2809                                 continue;
2810                         } else if (age >= ifp->prefered_lft) {
2811                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2812                                 int deprecate = 0;
2813
2814                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2815                                         deprecate = 1;
2816                                         ifp->flags |= IFA_F_DEPRECATED;
2817                                 }
2818
2819                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2820                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2821
2822                                 spin_unlock(&ifp->lock);
2823
2824                                 if (deprecate) {
2825                                         in6_ifa_hold(ifp);
2826                                         read_unlock(&addrconf_hash_lock);
2827
2828                                         ipv6_ifa_notify(0, ifp);
2829                                         in6_ifa_put(ifp);
2830                                         goto restart;
2831                                 }
2832 #ifdef CONFIG_IPV6_PRIVACY
2833                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2834                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2835                                 if (age >= ifp->prefered_lft - regen_advance) {
2836                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2837                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2838                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2839                                         if (!ifp->regen_count && ifpub) {
2840                                                 ifp->regen_count++;
2841                                                 in6_ifa_hold(ifp);
2842                                                 in6_ifa_hold(ifpub);
2843                                                 spin_unlock(&ifp->lock);
2844                                                 read_unlock(&addrconf_hash_lock);
2845                                                 spin_lock(&ifpub->lock);
2846                                                 ifpub->regen_count = 0;
2847                                                 spin_unlock(&ifpub->lock);
2848                                                 ipv6_create_tempaddr(ifpub, ifp);
2849                                                 in6_ifa_put(ifpub);
2850                                                 in6_ifa_put(ifp);
2851                                                 goto restart;
2852                                         }
2853                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2854                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2855                                 spin_unlock(&ifp->lock);
2856 #endif
2857                         } else {
2858                                 /* ifp->prefered_lft <= ifp->valid_lft */
2859                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2860                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2861                                 spin_unlock(&ifp->lock);
2862                         }
2863                 }
2864                 read_unlock(&addrconf_hash_lock);
2865         }
2866
2867         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2868         add_timer(&addr_chk_timer);
2869         spin_unlock_bh(&addrconf_verify_lock);
2870 }
2871
2872 static int
2873 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2874 {
2875         struct rtattr **rta = arg;
2876         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2877         struct in6_addr *pfx;
2878
2879         pfx = NULL;
2880         if (rta[IFA_ADDRESS-1]) {
2881                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2882                         return -EINVAL;
2883                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2884         }
2885         if (rta[IFA_LOCAL-1]) {
2886                 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
2887                     (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
2888                         return -EINVAL;
2889                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2890         }
2891         if (pfx == NULL)
2892                 return -EINVAL;
2893
2894         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2895 }
2896
2897 static int
2898 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2899 {
2900         struct rtattr  **rta = arg;
2901         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2902         struct in6_addr *pfx;
2903         __u32 valid_lft = INFINITY_LIFE_TIME, prefered_lft = INFINITY_LIFE_TIME;
2904
2905         pfx = NULL;
2906         if (rta[IFA_ADDRESS-1]) {
2907                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2908                         return -EINVAL;
2909                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2910         }
2911         if (rta[IFA_LOCAL-1]) {
2912                 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
2913                     (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
2914                         return -EINVAL;
2915                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2916         }
2917         if (pfx == NULL)
2918                 return -EINVAL;
2919
2920         if (rta[IFA_CACHEINFO-1]) {
2921                 struct ifa_cacheinfo *ci;
2922                 if (RTA_PAYLOAD(rta[IFA_CACHEINFO-1]) < sizeof(*ci))
2923                         return -EINVAL;
2924                 ci = RTA_DATA(rta[IFA_CACHEINFO-1]);
2925                 valid_lft = ci->ifa_valid;
2926                 prefered_lft = ci->ifa_prefered;
2927         }
2928
2929         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
2930                               prefered_lft, valid_lft);
2931
2932 }
2933
2934 /* Maximum length of ifa_cacheinfo attributes */
2935 #define INET6_IFADDR_RTA_SPACE \
2936                 RTA_SPACE(16) /* IFA_ADDRESS */ + \
2937                 RTA_SPACE(sizeof(struct ifa_cacheinfo)) /* CACHEINFO */
2938
2939 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2940                              u32 pid, u32 seq, int event, unsigned int flags)
2941 {
2942         struct ifaddrmsg *ifm;
2943         struct nlmsghdr  *nlh;
2944         struct ifa_cacheinfo ci;
2945         unsigned char    *b = skb->tail;
2946
2947         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2948         ifm = NLMSG_DATA(nlh);
2949         ifm->ifa_family = AF_INET6;
2950         ifm->ifa_prefixlen = ifa->prefix_len;
2951         ifm->ifa_flags = ifa->flags;
2952         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2953         if (ifa->scope&IFA_HOST)
2954                 ifm->ifa_scope = RT_SCOPE_HOST;
2955         else if (ifa->scope&IFA_LINK)
2956                 ifm->ifa_scope = RT_SCOPE_LINK;
2957         else if (ifa->scope&IFA_SITE)
2958                 ifm->ifa_scope = RT_SCOPE_SITE;
2959         ifm->ifa_index = ifa->idev->dev->ifindex;
2960         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2961         if (!(ifa->flags&IFA_F_PERMANENT)) {
2962                 ci.ifa_prefered = ifa->prefered_lft;
2963                 ci.ifa_valid = ifa->valid_lft;
2964                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2965                         long tval = (jiffies - ifa->tstamp)/HZ;
2966                         ci.ifa_prefered -= tval;
2967                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2968                                 ci.ifa_valid -= tval;
2969                 }
2970         } else {
2971                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2972                 ci.ifa_valid = INFINITY_LIFE_TIME;
2973         }
2974         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2975                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2976         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2977                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2978         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2979         nlh->nlmsg_len = skb->tail - b;
2980         return skb->len;
2981
2982 nlmsg_failure:
2983 rtattr_failure:
2984         skb_trim(skb, b - skb->data);
2985         return -1;
2986 }
2987
2988 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2989                                 u32 pid, u32 seq, int event, u16 flags)
2990 {
2991         struct ifaddrmsg *ifm;
2992         struct nlmsghdr  *nlh;
2993         struct ifa_cacheinfo ci;
2994         unsigned char    *b = skb->tail;
2995
2996         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2997         ifm = NLMSG_DATA(nlh);
2998         ifm->ifa_family = AF_INET6;
2999         ifm->ifa_prefixlen = 128;
3000         ifm->ifa_flags = IFA_F_PERMANENT;
3001         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3002         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
3003                 ifm->ifa_scope = RT_SCOPE_SITE;
3004         ifm->ifa_index = ifmca->idev->dev->ifindex;
3005         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
3006         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
3007                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
3008                     * 100 / HZ);
3009         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
3010                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
3011                     * 100 / HZ);
3012         ci.ifa_prefered = INFINITY_LIFE_TIME;
3013         ci.ifa_valid = INFINITY_LIFE_TIME;
3014         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3015         nlh->nlmsg_len = skb->tail - b;
3016         return skb->len;
3017
3018 nlmsg_failure:
3019 rtattr_failure:
3020         skb_trim(skb, b - skb->data);
3021         return -1;
3022 }
3023
3024 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3025                                 u32 pid, u32 seq, int event, unsigned int flags)
3026 {
3027         struct ifaddrmsg *ifm;
3028         struct nlmsghdr  *nlh;
3029         struct ifa_cacheinfo ci;
3030         unsigned char    *b = skb->tail;
3031
3032         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3033         ifm = NLMSG_DATA(nlh);
3034         ifm->ifa_family = AF_INET6;
3035         ifm->ifa_prefixlen = 128;
3036         ifm->ifa_flags = IFA_F_PERMANENT;
3037         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3038         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
3039                 ifm->ifa_scope = RT_SCOPE_SITE;
3040         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
3041         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
3042         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
3043                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
3044                     * 100 / HZ);
3045         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
3046                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
3047                     * 100 / HZ);
3048         ci.ifa_prefered = INFINITY_LIFE_TIME;
3049         ci.ifa_valid = INFINITY_LIFE_TIME;
3050         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3051         nlh->nlmsg_len = skb->tail - b;
3052         return skb->len;
3053
3054 nlmsg_failure:
3055 rtattr_failure:
3056         skb_trim(skb, b - skb->data);
3057         return -1;
3058 }
3059
3060 enum addr_type_t
3061 {
3062         UNICAST_ADDR,
3063         MULTICAST_ADDR,
3064         ANYCAST_ADDR,
3065 };
3066
3067 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3068                            enum addr_type_t type)
3069 {
3070         int idx, ip_idx;
3071         int s_idx, s_ip_idx;
3072         int err = 1;
3073         struct net_device *dev;
3074         struct inet6_dev *idev = NULL;
3075         struct inet6_ifaddr *ifa;
3076         struct ifmcaddr6 *ifmca;
3077         struct ifacaddr6 *ifaca;
3078
3079         s_idx = cb->args[0];
3080         s_ip_idx = ip_idx = cb->args[1];
3081         read_lock(&dev_base_lock);
3082
3083         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3084                 if (idx < s_idx)
3085                         continue;
3086                 if (idx > s_idx)
3087                         s_ip_idx = 0;
3088                 ip_idx = 0;
3089                 if ((idev = in6_dev_get(dev)) == NULL)
3090                         continue;
3091                 read_lock_bh(&idev->lock);
3092                 switch (type) {
3093                 case UNICAST_ADDR:
3094                         /* unicast address incl. temp addr */
3095                         for (ifa = idev->addr_list; ifa;
3096                              ifa = ifa->if_next, ip_idx++) {
3097                                 if (ip_idx < s_ip_idx)
3098                                         continue;
3099                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3100                                     NETLINK_CB(cb->skb).pid,
3101                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3102                                     NLM_F_MULTI)) <= 0)
3103                                         goto done;
3104                         }
3105                         break;
3106                 case MULTICAST_ADDR:
3107                         /* multicast address */
3108                         for (ifmca = idev->mc_list; ifmca;
3109                              ifmca = ifmca->next, ip_idx++) {
3110                                 if (ip_idx < s_ip_idx)
3111                                         continue;
3112                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3113                                     NETLINK_CB(cb->skb).pid,
3114                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3115                                     NLM_F_MULTI)) <= 0)
3116                                         goto done;
3117                         }
3118                         break;
3119                 case ANYCAST_ADDR:
3120                         /* anycast address */
3121                         for (ifaca = idev->ac_list; ifaca;
3122                              ifaca = ifaca->aca_next, ip_idx++) {
3123                                 if (ip_idx < s_ip_idx)
3124                                         continue;
3125                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3126                                     NETLINK_CB(cb->skb).pid,
3127                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3128                                     NLM_F_MULTI)) <= 0)
3129                                         goto done;
3130                         }
3131                         break;
3132                 default:
3133                         break;
3134                 }
3135                 read_unlock_bh(&idev->lock);
3136                 in6_dev_put(idev);
3137         }
3138 done:
3139         if (err <= 0) {
3140                 read_unlock_bh(&idev->lock);
3141                 in6_dev_put(idev);
3142         }
3143         read_unlock(&dev_base_lock);
3144         cb->args[0] = idx;
3145         cb->args[1] = ip_idx;
3146         return skb->len;
3147 }
3148
3149 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3150 {
3151         enum addr_type_t type = UNICAST_ADDR;
3152         return inet6_dump_addr(skb, cb, type);
3153 }
3154
3155 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3156 {
3157         enum addr_type_t type = MULTICAST_ADDR;
3158         return inet6_dump_addr(skb, cb, type);
3159 }
3160
3161
3162 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3163 {
3164         enum addr_type_t type = ANYCAST_ADDR;
3165         return inet6_dump_addr(skb, cb, type);
3166 }
3167
3168 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3169 {
3170         struct sk_buff *skb;
3171         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE);
3172
3173         skb = alloc_skb(size, GFP_ATOMIC);
3174         if (!skb) {
3175                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3176                 return;
3177         }
3178         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3179                 kfree_skb(skb);
3180                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3181                 return;
3182         }
3183         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3184         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3185 }
3186
3187 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3188                                 __s32 *array, int bytes)
3189 {
3190         memset(array, 0, bytes);
3191         array[DEVCONF_FORWARDING] = cnf->forwarding;
3192         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3193         array[DEVCONF_MTU6] = cnf->mtu6;
3194         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3195         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3196         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3197         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3198         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3199         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3200         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3201         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3202 #ifdef CONFIG_IPV6_PRIVACY
3203         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3204         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3205         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3206         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3207         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3208 #endif
3209         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3210         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3211         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3212 #ifdef CONFIG_IPV6_ROUTER_PREF
3213         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3214         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3215 #ifdef CONFIV_IPV6_ROUTE_INFO
3216         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3217 #endif
3218 #endif
3219 }
3220
3221 /* Maximum length of ifinfomsg attributes */
3222 #define INET6_IFINFO_RTA_SPACE \
3223                 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \
3224                 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \
3225                 RTA_SPACE(sizeof(u32)) /* MTU */ + \
3226                 RTA_SPACE(sizeof(int)) /* LINK */ + \
3227                 RTA_SPACE(0) /* PROTINFO */ + \
3228                 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \
3229                 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \
3230                 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */
3231
3232 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3233                              u32 pid, u32 seq, int event, unsigned int flags)
3234 {
3235         struct net_device       *dev = idev->dev;
3236         __s32                   *array = NULL;
3237         struct ifinfomsg        *r;
3238         struct nlmsghdr         *nlh;
3239         unsigned char           *b = skb->tail;
3240         struct rtattr           *subattr;
3241         __u32                   mtu = dev->mtu;
3242         struct ifla_cacheinfo   ci;
3243
3244         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3245         r = NLMSG_DATA(nlh);
3246         r->ifi_family = AF_INET6;
3247         r->__ifi_pad = 0;
3248         r->ifi_type = dev->type;
3249         r->ifi_index = dev->ifindex;
3250         r->ifi_flags = dev_get_flags(dev);
3251         r->ifi_change = 0;
3252
3253         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3254
3255         if (dev->addr_len)
3256                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3257
3258         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3259         if (dev->ifindex != dev->iflink)
3260                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3261
3262         subattr = (struct rtattr*)skb->tail;
3263
3264         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3265
3266         /* return the device flags */
3267         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3268
3269         /* return interface cacheinfo */
3270         ci.max_reasm_len = IPV6_MAXPLEN;
3271         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3272                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3273         ci.reachable_time = idev->nd_parms->reachable_time;
3274         ci.retrans_time = idev->nd_parms->retrans_time;
3275         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3276
3277         /* return the device sysctl params */
3278         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3279                 goto rtattr_failure;
3280         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3281         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3282
3283         /* XXX - Statistics/MC not implemented */
3284         subattr->rta_len = skb->tail - (u8*)subattr;
3285
3286         nlh->nlmsg_len = skb->tail - b;
3287         kfree(array);
3288         return skb->len;
3289
3290 nlmsg_failure:
3291 rtattr_failure:
3292         kfree(array);
3293         skb_trim(skb, b - skb->data);
3294         return -1;
3295 }
3296
3297 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3298 {
3299         int idx, err;
3300         int s_idx = cb->args[0];
3301         struct net_device *dev;
3302         struct inet6_dev *idev;
3303
3304         read_lock(&dev_base_lock);
3305         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3306                 if (idx < s_idx)
3307                         continue;
3308                 if ((idev = in6_dev_get(dev)) == NULL)
3309                         continue;
3310                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3311                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3312                 in6_dev_put(idev);
3313                 if (err <= 0)
3314                         break;
3315         }
3316         read_unlock(&dev_base_lock);
3317         cb->args[0] = idx;
3318
3319         return skb->len;
3320 }
3321
3322 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3323 {
3324         struct sk_buff *skb;
3325         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE);
3326
3327         skb = alloc_skb(size, GFP_ATOMIC);
3328         if (!skb) {
3329                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3330                 return;
3331         }
3332         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3333                 kfree_skb(skb);
3334                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3335                 return;
3336         }
3337         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3338         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3339 }
3340
3341 /* Maximum length of prefix_cacheinfo attributes */
3342 #define INET6_PREFIX_RTA_SPACE \
3343                 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \
3344                 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */
3345
3346 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3347                         struct prefix_info *pinfo, u32 pid, u32 seq,
3348                         int event, unsigned int flags)
3349 {
3350         struct prefixmsg        *pmsg;
3351         struct nlmsghdr         *nlh;
3352         unsigned char           *b = skb->tail;
3353         struct prefix_cacheinfo ci;
3354
3355         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3356         pmsg = NLMSG_DATA(nlh);
3357         pmsg->prefix_family = AF_INET6;
3358         pmsg->prefix_pad1 = 0;
3359         pmsg->prefix_pad2 = 0;
3360         pmsg->prefix_ifindex = idev->dev->ifindex;
3361         pmsg->prefix_len = pinfo->prefix_len;
3362         pmsg->prefix_type = pinfo->type;
3363         pmsg->prefix_pad3 = 0;
3364
3365         pmsg->prefix_flags = 0;
3366         if (pinfo->onlink)
3367                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3368         if (pinfo->autoconf)
3369                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3370
3371         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3372
3373         ci.preferred_time = ntohl(pinfo->prefered);
3374         ci.valid_time = ntohl(pinfo->valid);
3375         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3376
3377         nlh->nlmsg_len = skb->tail - b;
3378         return skb->len;
3379
3380 nlmsg_failure:
3381 rtattr_failure:
3382         skb_trim(skb, b - skb->data);
3383         return -1;
3384 }
3385
3386 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3387                          struct prefix_info *pinfo)
3388 {
3389         struct sk_buff *skb;
3390         int size = NLMSG_SPACE(sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE);
3391
3392         skb = alloc_skb(size, GFP_ATOMIC);
3393         if (!skb) {
3394                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3395                 return;
3396         }
3397         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3398                 kfree_skb(skb);
3399                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3400                 return;
3401         }
3402         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3403         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3404 }
3405
3406 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3407         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3408         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3409         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3410         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3411         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3412         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3413         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3414         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3415         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3416                                       .dumpit   = inet6_dump_fib, },
3417 };
3418
3419 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3420 {
3421         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3422
3423         switch (event) {
3424         case RTM_NEWADDR:
3425                 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3426                 if (ifp->idev->cnf.forwarding)
3427                         addrconf_join_anycast(ifp);
3428                 break;
3429         case RTM_DELADDR:
3430                 if (ifp->idev->cnf.forwarding)
3431                         addrconf_leave_anycast(ifp);
3432                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3433                 dst_hold(&ifp->rt->u.dst);
3434                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3435                         dst_free(&ifp->rt->u.dst);
3436                 break;
3437         }
3438 }
3439
3440 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3441 {
3442         read_lock_bh(&addrconf_lock);
3443         if (likely(ifp->idev->dead == 0))
3444                 __ipv6_ifa_notify(event, ifp);
3445         read_unlock_bh(&addrconf_lock);
3446 }
3447
3448 #ifdef CONFIG_SYSCTL
3449
3450 static
3451 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3452                            void __user *buffer, size_t *lenp, loff_t *ppos)
3453 {
3454         int *valp = ctl->data;
3455         int val = *valp;
3456         int ret;
3457
3458         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3459
3460         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3461                 if (valp != &ipv6_devconf.forwarding) {
3462                         if ((!*valp) ^ (!val)) {
3463                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3464                                 if (idev == NULL)
3465                                         return ret;
3466                                 dev_forward_change(idev);
3467                         }
3468                 } else {
3469                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3470                         addrconf_forward_change();
3471                 }
3472                 if (*valp)
3473                         rt6_purge_dflt_routers();
3474         }
3475
3476         return ret;
3477 }
3478
3479 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3480                                             int __user *name, int nlen,
3481                                             void __user *oldval,
3482                                             size_t __user *oldlenp,
3483                                             void __user *newval, size_t newlen,
3484                                             void **context)
3485 {
3486         int *valp = table->data;
3487         int new;
3488
3489         if (!newval || !newlen)
3490                 return 0;
3491         if (newlen != sizeof(int))
3492                 return -EINVAL;
3493         if (get_user(new, (int __user *)newval))
3494                 return -EFAULT;
3495         if (new == *valp)
3496                 return 0;
3497         if (oldval && oldlenp) {
3498                 size_t len;
3499                 if (get_user(len, oldlenp))
3500                         return -EFAULT;
3501                 if (len) {
3502                         if (len > table->maxlen)
3503                                 len = table->maxlen;
3504                         if (copy_to_user(oldval, valp, len))
3505                                 return -EFAULT;
3506                         if (put_user(len, oldlenp))
3507                                 return -EFAULT;
3508                 }
3509         }
3510
3511         if (valp != &ipv6_devconf_dflt.forwarding) {
3512                 if (valp != &ipv6_devconf.forwarding) {
3513                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3514                         int changed;
3515                         if (unlikely(idev == NULL))
3516                                 return -ENODEV;
3517                         changed = (!*valp) ^ (!new);
3518                         *valp = new;
3519                         if (changed)
3520                                 dev_forward_change(idev);
3521                 } else {
3522                         *valp = new;
3523                         addrconf_forward_change();
3524                 }
3525
3526                 if (*valp)
3527                         rt6_purge_dflt_routers();
3528         } else
3529                 *valp = new;
3530
3531         return 1;
3532 }
3533
3534 static struct addrconf_sysctl_table
3535 {
3536         struct ctl_table_header *sysctl_header;
3537         ctl_table addrconf_vars[__NET_IPV6_MAX];
3538         ctl_table addrconf_dev[2];
3539         ctl_table addrconf_conf_dir[2];
3540         ctl_table addrconf_proto_dir[2];
3541         ctl_table addrconf_root_dir[2];
3542 } addrconf_sysctl = {
3543         .sysctl_header = NULL,
3544         .addrconf_vars = {
3545                 {
3546                         .ctl_name       =       NET_IPV6_FORWARDING,
3547                         .procname       =       "forwarding",
3548                         .data           =       &ipv6_devconf.forwarding,
3549                         .maxlen         =       sizeof(int),
3550                         .mode           =       0644,
3551                         .proc_handler   =       &addrconf_sysctl_forward,
3552                         .strategy       =       &addrconf_sysctl_forward_strategy,
3553                 },
3554                 {
3555                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3556                         .procname       =       "hop_limit",
3557                         .data           =       &ipv6_devconf.hop_limit,
3558                         .maxlen         =       sizeof(int),
3559                         .mode           =       0644,
3560                         .proc_handler   =       proc_dointvec,
3561                 },
3562                 {
3563                         .ctl_name       =       NET_IPV6_MTU,
3564                         .procname       =       "mtu",
3565                         .data           =       &ipv6_devconf.mtu6,
3566                         .maxlen         =       sizeof(int),
3567                         .mode           =       0644,
3568                         .proc_handler   =       &proc_dointvec,
3569                 },
3570                 {
3571                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3572                         .procname       =       "accept_ra",
3573                         .data           =       &ipv6_devconf.accept_ra,
3574                         .maxlen         =       sizeof(int),
3575                         .mode           =       0644,
3576                         .proc_handler   =       &proc_dointvec,
3577                 },
3578                 {
3579                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3580                         .procname       =       "accept_redirects",
3581                         .data           =       &ipv6_devconf.accept_redirects,
3582                         .maxlen         =       sizeof(int),
3583                         .mode           =       0644,
3584                         .proc_handler   =       &proc_dointvec,
3585                 },
3586                 {
3587                         .ctl_name       =       NET_IPV6_AUTOCONF,
3588                         .procname       =       "autoconf",
3589                         .data           =       &ipv6_devconf.autoconf,
3590                         .maxlen         =       sizeof(int),
3591                         .mode           =       0644,
3592                         .proc_handler   =       &proc_dointvec,
3593                 },
3594                 {
3595                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3596                         .procname       =       "dad_transmits",
3597                         .data           =       &ipv6_devconf.dad_transmits,
3598                         .maxlen         =       sizeof(int),
3599                         .mode           =       0644,
3600                         .proc_handler   =       &proc_dointvec,
3601                 },
3602                 {
3603                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3604                         .procname       =       "router_solicitations",
3605                         .data           =       &ipv6_devconf.rtr_solicits,
3606                         .maxlen         =       sizeof(int),
3607                         .mode           =       0644,
3608                         .proc_handler   =       &proc_dointvec,
3609                 },
3610                 {
3611                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3612                         .procname       =       "router_solicitation_interval",
3613                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3614                         .maxlen         =       sizeof(int),
3615                         .mode           =       0644,
3616                         .proc_handler   =       &proc_dointvec_jiffies,
3617                         .strategy       =       &sysctl_jiffies,
3618                 },
3619                 {
3620                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3621                         .procname       =       "router_solicitation_delay",
3622                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3623                         .maxlen         =       sizeof(int),
3624                         .mode           =       0644,
3625                         .proc_handler   =       &proc_dointvec_jiffies,
3626                         .strategy       =       &sysctl_jiffies,
3627                 },
3628                 {
3629                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3630                         .procname       =       "force_mld_version",
3631                         .data           =       &ipv6_devconf.force_mld_version,
3632                         .maxlen         =       sizeof(int),
3633                         .mode           =       0644,
3634                         .proc_handler   =       &proc_dointvec,
3635                 },
3636 #ifdef CONFIG_IPV6_PRIVACY
3637                 {
3638                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3639                         .procname       =       "use_tempaddr",
3640                         .data           =       &ipv6_devconf.use_tempaddr,
3641                         .maxlen         =       sizeof(int),
3642                         .mode           =       0644,
3643                         .proc_handler   =       &proc_dointvec,
3644                 },
3645                 {
3646                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3647                         .procname       =       "temp_valid_lft",
3648                         .data           =       &ipv6_devconf.temp_valid_lft,
3649                         .maxlen         =       sizeof(int),
3650                         .mode           =       0644,
3651                         .proc_handler   =       &proc_dointvec,
3652                 },
3653                 {
3654                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3655                         .procname       =       "temp_prefered_lft",
3656                         .data           =       &ipv6_devconf.temp_prefered_lft,
3657                         .maxlen         =       sizeof(int),
3658                         .mode           =       0644,
3659                         .proc_handler   =       &proc_dointvec,
3660                 },
3661                 {
3662                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3663                         .procname       =       "regen_max_retry",
3664                         .data           =       &ipv6_devconf.regen_max_retry,
3665                         .maxlen         =       sizeof(int),
3666                         .mode           =       0644,
3667                         .proc_handler   =       &proc_dointvec,
3668                 },
3669                 {
3670                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3671                         .procname       =       "max_desync_factor",
3672                         .data           =       &ipv6_devconf.max_desync_factor,
3673                         .maxlen         =       sizeof(int),
3674                         .mode           =       0644,
3675                         .proc_handler   =       &proc_dointvec,
3676                 },
3677 #endif
3678                 {
3679                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3680                         .procname       =       "max_addresses",
3681                         .data           =       &ipv6_devconf.max_addresses,
3682                         .maxlen         =       sizeof(int),
3683                         .mode           =       0644,
3684                         .proc_handler   =       &proc_dointvec,
3685                 },
3686                 {
3687                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3688                         .procname       =       "accept_ra_defrtr",
3689                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3690                         .maxlen         =       sizeof(int),
3691                         .mode           =       0644,
3692                         .proc_handler   =       &proc_dointvec,
3693                 },
3694                 {
3695                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3696                         .procname       =       "accept_ra_pinfo",
3697                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3698                         .maxlen         =       sizeof(int),
3699                         .mode           =       0644,
3700                         .proc_handler   =       &proc_dointvec,
3701                 },
3702 #ifdef CONFIG_IPV6_ROUTER_PREF
3703                 {
3704                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3705                         .procname       =       "accept_ra_rtr_pref",
3706                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3707                         .maxlen         =       sizeof(int),
3708                         .mode           =       0644,
3709                         .proc_handler   =       &proc_dointvec,
3710                 },
3711                 {
3712                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3713                         .procname       =       "router_probe_interval",
3714                         .data           =       &ipv6_devconf.rtr_probe_interval,
3715                         .maxlen         =       sizeof(int),
3716                         .mode           =       0644,
3717                         .proc_handler   =       &proc_dointvec_jiffies,
3718                         .strategy       =       &sysctl_jiffies,
3719                 },
3720 #ifdef CONFIV_IPV6_ROUTE_INFO
3721                 {
3722                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3723                         .procname       =       "accept_ra_rt_info_max_plen",
3724                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3725                         .maxlen         =       sizeof(int),
3726                         .mode           =       0644,
3727                         .proc_handler   =       &proc_dointvec,
3728                 },
3729 #endif
3730 #endif
3731                 {
3732                         .ctl_name       =       0,      /* sentinel */
3733                 }
3734         },
3735         .addrconf_dev = {
3736                 {
3737                         .ctl_name       =       NET_PROTO_CONF_ALL,
3738                         .procname       =       "all",
3739                         .mode           =       0555,
3740                         .child          =       addrconf_sysctl.addrconf_vars,
3741                 },
3742                 {
3743                         .ctl_name       =       0,      /* sentinel */
3744                 }
3745         },
3746         .addrconf_conf_dir = {
3747                 {
3748                         .ctl_name       =       NET_IPV6_CONF,
3749                         .procname       =       "conf",
3750                         .mode           =       0555,
3751                         .child          =       addrconf_sysctl.addrconf_dev,
3752                 },
3753                 {
3754                         .ctl_name       =       0,      /* sentinel */
3755                 }
3756         },
3757         .addrconf_proto_dir = {
3758                 {
3759                         .ctl_name       =       NET_IPV6,
3760                         .procname       =       "ipv6",
3761                         .mode           =       0555,
3762                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3763                 },
3764                 {
3765                         .ctl_name       =       0,      /* sentinel */
3766                 }
3767         },
3768         .addrconf_root_dir = {
3769                 {
3770                         .ctl_name       =       CTL_NET,
3771                         .procname       =       "net",
3772                         .mode           =       0555,
3773                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3774                 },
3775                 {
3776                         .ctl_name       =       0,      /* sentinel */
3777                 }
3778         },
3779 };
3780
3781 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3782 {
3783         int i;
3784         struct net_device *dev = idev ? idev->dev : NULL;
3785         struct addrconf_sysctl_table *t;
3786         char *dev_name = NULL;
3787
3788         t = kmalloc(sizeof(*t), GFP_KERNEL);
3789         if (t == NULL)
3790                 return;
3791         memcpy(t, &addrconf_sysctl, sizeof(*t));
3792         for (i=0; t->addrconf_vars[i].data; i++) {
3793                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3794                 t->addrconf_vars[i].de = NULL;
3795                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3796         }
3797         if (dev) {
3798                 dev_name = dev->name;
3799                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3800         } else {
3801                 dev_name = "default";
3802                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3803         }
3804
3805         /*
3806          * Make a copy of dev_name, because '.procname' is regarded as const
3807          * by sysctl and we wouldn't want anyone to change it under our feet
3808          * (see SIOCSIFNAME).
3809          */
3810         dev_name = kstrdup(dev_name, GFP_KERNEL);
3811         if (!dev_name)
3812             goto free;
3813
3814         t->addrconf_dev[0].procname = dev_name;
3815
3816         t->addrconf_dev[0].child = t->addrconf_vars;
3817         t->addrconf_dev[0].de = NULL;
3818         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3819         t->addrconf_conf_dir[0].de = NULL;
3820         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3821         t->addrconf_proto_dir[0].de = NULL;
3822         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3823         t->addrconf_root_dir[0].de = NULL;
3824
3825         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3826         if (t->sysctl_header == NULL)
3827                 goto free_procname;
3828         else
3829                 p->sysctl = t;
3830         return;
3831
3832         /* error path */
3833  free_procname:
3834         kfree(dev_name);
3835  free:
3836         kfree(t);
3837
3838         return;
3839 }
3840
3841 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3842 {
3843         if (p->sysctl) {
3844                 struct addrconf_sysctl_table *t = p->sysctl;
3845                 p->sysctl = NULL;
3846                 unregister_sysctl_table(t->sysctl_header);
3847                 kfree(t->addrconf_dev[0].procname);
3848                 kfree(t);
3849         }
3850 }
3851
3852
3853 #endif
3854
3855 /*
3856  *      Device notifier
3857  */
3858
3859 int register_inet6addr_notifier(struct notifier_block *nb)
3860 {
3861         return atomic_notifier_chain_register(&inet6addr_chain, nb);
3862 }
3863
3864 int unregister_inet6addr_notifier(struct notifier_block *nb)
3865 {
3866         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
3867 }
3868
3869 /*
3870  *      Init / cleanup code
3871  */
3872
3873 int __init addrconf_init(void)
3874 {
3875         int err = 0;
3876
3877         /* The addrconf netdev notifier requires that loopback_dev
3878          * has it's ipv6 private information allocated and setup
3879          * before it can bring up and give link-local addresses
3880          * to other devices which are up.
3881          *
3882          * Unfortunately, loopback_dev is not necessarily the first
3883          * entry in the global dev_base list of net devices.  In fact,
3884          * it is likely to be the very last entry on that list.
3885          * So this causes the notifier registry below to try and
3886          * give link-local addresses to all devices besides loopback_dev
3887          * first, then loopback_dev, which cases all the non-loopback_dev
3888          * devices to fail to get a link-local address.
3889          *
3890          * So, as a temporary fix, allocate the ipv6 structure for
3891          * loopback_dev first by hand.
3892          * Longer term, all of the dependencies ipv6 has upon the loopback
3893          * device and it being up should be removed.
3894          */
3895         rtnl_lock();
3896         if (!ipv6_add_dev(&loopback_dev))
3897                 err = -ENOMEM;
3898         rtnl_unlock();
3899         if (err)
3900                 return err;
3901
3902         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3903
3904         register_netdevice_notifier(&ipv6_dev_notf);
3905
3906         addrconf_verify(0);
3907         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3908 #ifdef CONFIG_SYSCTL
3909         addrconf_sysctl.sysctl_header =
3910                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3911         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3912 #endif
3913
3914         return 0;
3915 }
3916
3917 void __exit addrconf_cleanup(void)
3918 {
3919         struct net_device *dev;
3920         struct inet6_dev *idev;
3921         struct inet6_ifaddr *ifa;
3922         int i;
3923
3924         unregister_netdevice_notifier(&ipv6_dev_notf);
3925
3926         rtnetlink_links[PF_INET6] = NULL;
3927 #ifdef CONFIG_SYSCTL
3928         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3929         addrconf_sysctl_unregister(&ipv6_devconf);
3930 #endif
3931
3932         rtnl_lock();
3933
3934         /*
3935          *      clean dev list.
3936          */
3937
3938         for (dev=dev_base; dev; dev=dev->next) {
3939                 if ((idev = __in6_dev_get(dev)) == NULL)
3940                         continue;
3941                 addrconf_ifdown(dev, 1);
3942         }
3943         addrconf_ifdown(&loopback_dev, 2);
3944
3945         /*
3946          *      Check hash table.
3947          */
3948
3949         write_lock_bh(&addrconf_hash_lock);
3950         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3951                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3952                         struct inet6_ifaddr *bifa;
3953
3954                         bifa = ifa;
3955                         ifa = ifa->lst_next;
3956                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3957                         /* Do not free it; something is wrong.
3958                            Now we can investigate it with debugger.
3959                          */
3960                 }
3961         }
3962         write_unlock_bh(&addrconf_hash_lock);
3963
3964         del_timer(&addr_chk_timer);
3965
3966         rtnl_unlock();
3967
3968 #ifdef CONFIG_PROC_FS
3969         proc_net_remove("if_inet6");
3970 #endif
3971 }