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