git.oblomov.eu Git - linux-2.6/blob - 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 = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 345
 346         if (ndev == NULL)
 347                 return NULL;
 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         return ndev;
 422 }
 423
 424 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 425 {
 426         struct inet6_dev *idev;
 427
 428         ASSERT_RTNL();
 429
 430         if ((idev = __in6_dev_get(dev)) == NULL) {
 431                 if ((idev = ipv6_add_dev(dev)) == NULL)
 432                         return NULL;
 433         }
 434
 435         if (dev->flags&IFF_UP)
 436                 ipv6_mc_up(idev);
 437         return idev;
 438 }
 439
 440 #ifdef CONFIG_SYSCTL
 441 static void dev_forward_change(struct inet6_dev *idev)
 442 {
 443         struct net_device *dev;
 444         struct inet6_ifaddr *ifa;
 445         struct in6_addr addr;
 446
 447         if (!idev)
 448                 return;
 449         dev = idev->dev;
 450         if (dev && (dev->flags & IFF_MULTICAST)) {
 451                 ipv6_addr_all_routers(&addr);
 452
 453                 if (idev->cnf.forwarding)
 454                         ipv6_dev_mc_inc(dev, &addr);
 455                 else
 456                         ipv6_dev_mc_dec(dev, &addr);
 457         }
 458         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 459                 if (idev->cnf.forwarding)
 460                         addrconf_join_anycast(ifa);
 461                 else
 462                         addrconf_leave_anycast(ifa);
 463         }
 464 }
 465
 466
 467 static void addrconf_forward_change(void)
 468 {
 469         struct net_device *dev;
 470         struct inet6_dev *idev;
 471
 472         read_lock(&dev_base_lock);
 473         for (dev=dev_base; dev; dev=dev->next) {
 474                 read_lock(&addrconf_lock);
 475                 idev = __in6_dev_get(dev);
 476                 if (idev) {
 477                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 478                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 479                         if (changed)
 480                                 dev_forward_change(idev);
 481                 }
 482                 read_unlock(&addrconf_lock);
 483         }
 484         read_unlock(&dev_base_lock);
 485 }
 486 #endif
 487
 488 /* Nobody refers to this ifaddr, destroy it */
 489
 490 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 491 {
 492         BUG_TRAP(ifp->if_next==NULL);
 493         BUG_TRAP(ifp->lst_next==NULL);
 494 #ifdef NET_REFCNT_DEBUG
 495         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 496 #endif
 497
 498         in6_dev_put(ifp->idev);
 499
 500         if (del_timer(&ifp->timer))
 501                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 502
 503         if (!ifp->dead) {
 504                 printk("Freeing alive inet6 address %p\n", ifp);
 505                 return;
 506         }
 507         dst_release(&ifp->rt->u.dst);
 508
 509         kfree(ifp);
 510 }
 511
 512 /* On success it returns ifp with increased reference count */
 513
 514 static struct inet6_ifaddr *
 515 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 516               int scope, u32 flags)
 517 {
 518         struct inet6_ifaddr *ifa = NULL;
 519         struct rt6_info *rt;
 520         int hash;
 521         int err = 0;
 522
 523         read_lock_bh(&addrconf_lock);
 524         if (idev->dead) {
 525                 err = -ENODEV;                  /*XXX*/
 526                 goto out2;
 527         }
 528
 529         write_lock(&addrconf_hash_lock);
 530
 531         /* Ignore adding duplicate addresses on an interface */
 532         if (ipv6_chk_same_addr(addr, idev->dev)) {
 533                 ADBG(("ipv6_add_addr: already assigned\n"));
 534                 err = -EEXIST;
 535                 goto out;
 536         }
 537
 538         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 539
 540         if (ifa == NULL) {
 541                 ADBG(("ipv6_add_addr: malloc failed\n"));
 542                 err = -ENOBUFS;
 543                 goto out;
 544         }
 545
 546         rt = addrconf_dst_alloc(idev, addr, 0);
 547         if (IS_ERR(rt)) {
 548                 err = PTR_ERR(rt);
 549                 goto out;
 550         }
 551
 552         ipv6_addr_copy(&ifa->addr, addr);
 553
 554         spin_lock_init(&ifa->lock);
 555         init_timer(&ifa->timer);
 556         ifa->timer.data = (unsigned long) ifa;
 557         ifa->scope = scope;
 558         ifa->prefix_len = pfxlen;
 559         ifa->flags = flags | IFA_F_TENTATIVE;
 560         ifa->cstamp = ifa->tstamp = jiffies;
 561
 562         ifa->idev = idev;
 563         in6_dev_hold(idev);
 564         /* For caller */
 565         in6_ifa_hold(ifa);
 566
 567         /* Add to big hash table */
 568         hash = ipv6_addr_hash(addr);
 569
 570         ifa->lst_next = inet6_addr_lst[hash];
 571         inet6_addr_lst[hash] = ifa;
 572         in6_ifa_hold(ifa);
 573         write_unlock(&addrconf_hash_lock);
 574
 575         write_lock(&idev->lock);
 576         /* Add to inet6_dev unicast addr list. */
 577         ifa->if_next = idev->addr_list;
 578         idev->addr_list = ifa;
 579
 580 #ifdef CONFIG_IPV6_PRIVACY
 581         if (ifa->flags&IFA_F_TEMPORARY) {
 582                 ifa->tmp_next = idev->tempaddr_list;
 583                 idev->tempaddr_list = ifa;
 584                 in6_ifa_hold(ifa);
 585         }
 586 #endif
 587
 588         ifa->rt = rt;
 589
 590         in6_ifa_hold(ifa);
 591         write_unlock(&idev->lock);
 592 out2:
 593         read_unlock_bh(&addrconf_lock);
 594
 595         if (likely(err == 0))
 596                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 597         else {
 598                 kfree(ifa);
 599                 ifa = ERR_PTR(err);
 600         }
 601
 602         return ifa;
 603 out:
 604         write_unlock(&addrconf_hash_lock);
 605         goto out2;
 606 }
 607
 608 /* This function wants to get referenced ifp and releases it before return */
 609
 610 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 611 {
 612         struct inet6_ifaddr *ifa, **ifap;
 613         struct inet6_dev *idev = ifp->idev;
 614         int hash;
 615         int deleted = 0, onlink = 0;
 616         unsigned long expires = jiffies;
 617
 618         hash = ipv6_addr_hash(&ifp->addr);
 619
 620         ifp->dead = 1;
 621
 622         write_lock_bh(&addrconf_hash_lock);
 623         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 624              ifap = &ifa->lst_next) {
 625                 if (ifa == ifp) {
 626                         *ifap = ifa->lst_next;
 627                         __in6_ifa_put(ifp);
 628                         ifa->lst_next = NULL;
 629                         break;
 630                 }
 631         }
 632         write_unlock_bh(&addrconf_hash_lock);
 633
 634         write_lock_bh(&idev->lock);
 635 #ifdef CONFIG_IPV6_PRIVACY
 636         if (ifp->flags&IFA_F_TEMPORARY) {
 637                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 638                      ifap = &ifa->tmp_next) {
 639                         if (ifa == ifp) {
 640                                 *ifap = ifa->tmp_next;
 641                                 if (ifp->ifpub) {
 642                                         in6_ifa_put(ifp->ifpub);
 643                                         ifp->ifpub = NULL;
 644                                 }
 645                                 __in6_ifa_put(ifp);
 646                                 ifa->tmp_next = NULL;
 647                                 break;
 648                         }
 649                 }
 650         }
 651 #endif
 652
 653         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 654                 if (ifa == ifp) {
 655                         *ifap = ifa->if_next;
 656                         __in6_ifa_put(ifp);
 657                         ifa->if_next = NULL;
 658                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 659                                 break;
 660                         deleted = 1;
 661                         continue;
 662                 } else if (ifp->flags & IFA_F_PERMANENT) {
 663                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 664                                               ifp->prefix_len)) {
 665                                 if (ifa->flags & IFA_F_PERMANENT) {
 666                                         onlink = 1;
 667                                         if (deleted)
 668                                                 break;
 669                                 } else {
 670                                         unsigned long lifetime;
 671
 672                                         if (!onlink)
 673                                                 onlink = -1;
 674
 675                                         spin_lock(&ifa->lock);
 676                                         lifetime = min_t(unsigned long,
 677                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 678                                         if (time_before(expires,
 679                                                         ifa->tstamp + lifetime * HZ))
 680                                                 expires = ifa->tstamp + lifetime * HZ;
 681                                         spin_unlock(&ifa->lock);
 682                                 }
 683                         }
 684                 }
 685                 ifap = &ifa->if_next;
 686         }
 687         write_unlock_bh(&idev->lock);
 688
 689         ipv6_ifa_notify(RTM_DELADDR, ifp);
 690
 691         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 692
 693         addrconf_del_timer(ifp);
 694
 695         /*
 696          * Purge or update corresponding prefix
 697          *
 698          * 1) we don't purge prefix here if address was not permanent.
 699          *    prefix is managed by its own lifetime.
 700          * 2) if there're no addresses, delete prefix.
 701          * 3) if there're still other permanent address(es),
 702          *    corresponding prefix is still permanent.
 703          * 4) otherwise, update prefix lifetime to the
 704          *    longest valid lifetime among the corresponding
 705          *    addresses on the device.
 706          *    Note: subsequent RA will update lifetime.
 707          *
 708          * --yoshfuji
 709          */
 710         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 711                 struct in6_addr prefix;
 712                 struct rt6_info *rt;
 713
 714                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 715                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 716
 717                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 718                         if (onlink == 0) {
 719                                 ip6_del_rt(rt, NULL, NULL, NULL);
 720                                 rt = NULL;
 721                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 722                                 rt->rt6i_expires = expires;
 723                                 rt->rt6i_flags |= RTF_EXPIRES;
 724                         }
 725                 }
 726                 dst_release(&rt->u.dst);
 727         }
 728
 729         in6_ifa_put(ifp);
 730 }
 731
 732 #ifdef CONFIG_IPV6_PRIVACY
 733 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 734 {
 735         struct inet6_dev *idev = ifp->idev;
 736         struct in6_addr addr, *tmpaddr;
 737         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 738         int tmp_plen;
 739         int ret = 0;
 740         int max_addresses;
 741
 742         write_lock(&idev->lock);
 743         if (ift) {
 744                 spin_lock_bh(&ift->lock);
 745                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 746                 spin_unlock_bh(&ift->lock);
 747                 tmpaddr = &addr;
 748         } else {
 749                 tmpaddr = NULL;
 750         }
 751 retry:
 752         in6_dev_hold(idev);
 753         if (idev->cnf.use_tempaddr <= 0) {
 754                 write_unlock(&idev->lock);
 755                 printk(KERN_INFO
 756                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 757                 in6_dev_put(idev);
 758                 ret = -1;
 759                 goto out;
 760         }
 761         spin_lock_bh(&ifp->lock);
 762         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 763                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 764                 spin_unlock_bh(&ifp->lock);
 765                 write_unlock(&idev->lock);
 766                 printk(KERN_WARNING
 767                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 768                 in6_dev_put(idev);
 769                 ret = -1;
 770                 goto out;
 771         }
 772         in6_ifa_hold(ifp);
 773         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 774         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 775                 spin_unlock_bh(&ifp->lock);
 776                 write_unlock(&idev->lock);
 777                 printk(KERN_WARNING
 778                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 779                 in6_ifa_put(ifp);
 780                 in6_dev_put(idev);
 781                 ret = -1;
 782                 goto out;
 783         }
 784         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 785         tmp_valid_lft = min_t(__u32,
 786                               ifp->valid_lft,
 787                               idev->cnf.temp_valid_lft);
 788         tmp_prefered_lft = min_t(__u32,
 789                                  ifp->prefered_lft,
 790                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 791         tmp_plen = ifp->prefix_len;
 792         max_addresses = idev->cnf.max_addresses;
 793         tmp_cstamp = ifp->cstamp;
 794         tmp_tstamp = ifp->tstamp;
 795         spin_unlock_bh(&ifp->lock);
 796
 797         write_unlock(&idev->lock);
 798         ift = !max_addresses ||
 799               ipv6_count_addresses(idev) < max_addresses ?
 800                 ipv6_add_addr(idev, &addr, tmp_plen,
 801                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 802         if (!ift || IS_ERR(ift)) {
 803                 in6_ifa_put(ifp);
 804                 in6_dev_put(idev);
 805                 printk(KERN_INFO
 806                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 807                 tmpaddr = &addr;
 808                 write_lock(&idev->lock);
 809                 goto retry;
 810         }
 811
 812         spin_lock_bh(&ift->lock);
 813         ift->ifpub = ifp;
 814         ift->valid_lft = tmp_valid_lft;
 815         ift->prefered_lft = tmp_prefered_lft;
 816         ift->cstamp = tmp_cstamp;
 817         ift->tstamp = tmp_tstamp;
 818         spin_unlock_bh(&ift->lock);
 819
 820         addrconf_dad_start(ift, 0);
 821         in6_ifa_put(ift);
 822         in6_dev_put(idev);
 823 out:
 824         return ret;
 825 }
 826 #endif
 827
 828 /*
 829  *      Choose an appropriate source address (RFC3484)
 830  */
 831 struct ipv6_saddr_score {
 832         int             addr_type;
 833         unsigned int    attrs;
 834         int             matchlen;
 835         int             scope;
 836         unsigned int    rule;
 837 };
 838
 839 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 840 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 841 #define IPV6_SADDR_SCORE_HOA            0x0008
 842 #define IPV6_SADDR_SCORE_OIF            0x0010
 843 #define IPV6_SADDR_SCORE_LABEL          0x0020
 844 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 845
 846 static int inline ipv6_saddr_preferred(int type)
 847 {
 848         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 849                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 850                 return 1;
 851         return 0;
 852 }
 853
 854 /* static matching label */
 855 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 856 {
 857  /*
 858   *     prefix (longest match)  label
 859   *     -----------------------------
 860   *     ::1/128                 0
 861   *     ::/0                    1
 862   *     2002::/16               2
 863   *     ::/96                   3
 864   *     ::ffff:0:0/96           4
 865   */
 866         if (type & IPV6_ADDR_LOOPBACK)
 867                 return 0;
 868         else if (type & IPV6_ADDR_COMPATv4)
 869                 return 3;
 870         else if (type & IPV6_ADDR_MAPPED)
 871                 return 4;
 872         else if (addr->s6_addr16[0] == htons(0x2002))
 873                 return 2;
 874         return 1;
 875 }
 876
 877 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 878                        struct in6_addr *daddr, struct in6_addr *saddr)
 879 {
 880         struct ipv6_saddr_score hiscore;
 881         struct inet6_ifaddr *ifa_result = NULL;
 882         int daddr_type = __ipv6_addr_type(daddr);
 883         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 884         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 885         struct net_device *dev;
 886
 887         memset(&hiscore, 0, sizeof(hiscore));
 888
 889         read_lock(&dev_base_lock);
 890         read_lock(&addrconf_lock);
 891
 892         for (dev = dev_base; dev; dev=dev->next) {
 893                 struct inet6_dev *idev;
 894                 struct inet6_ifaddr *ifa;
 895
 896                 /* Rule 0: Candidate Source Address (section 4)
 897                  *  - multicast and link-local destination address,
 898                  *    the set of candidate source address MUST only
 899                  *    include addresses assigned to interfaces
 900                  *    belonging to the same link as the outgoing
 901                  *    interface.
 902                  * (- For site-local destination addresses, the
 903                  *    set of candidate source addresses MUST only
 904                  *    include addresses assigned to interfaces
 905                  *    belonging to the same site as the outgoing
 906                  *    interface.)
 907                  */
 908                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 909                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 910                     daddr_dev && dev != daddr_dev)
 911                         continue;
 912
 913                 idev = __in6_dev_get(dev);
 914                 if (!idev)
 915                         continue;
 916
 917                 read_lock_bh(&idev->lock);
 918                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 919                         struct ipv6_saddr_score score;
 920
 921                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 922
 923                         /* Rule 0:
 924                          * - Tentative Address (RFC2462 section 5.4)
 925                          *  - A tentative address is not considered
 926                          *    "assigned to an interface" in the traditional
 927                          *    sense.
 928                          * - Candidate Source Address (section 4)
 929                          *  - In any case, anycast addresses, multicast
 930                          *    addresses, and the unspecified address MUST
 931                          *    NOT be included in a candidate set.
 932                          */
 933                         if (ifa->flags & IFA_F_TENTATIVE)
 934                                 continue;
 935                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 936                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 937                                 LIMIT_NETDEBUG(KERN_DEBUG
 938                                                "ADDRCONF: unspecified / multicast address"
 939                                                "assigned as unicast address on %s",
 940                                                dev->name);
 941                                 continue;
 942                         }
 943
 944                         score.attrs = 0;
 945                         score.matchlen = 0;
 946                         score.scope = 0;
 947                         score.rule = 0;
 948
 949                         if (ifa_result == NULL) {
 950                                 /* record it if the first available entry */
 951                                 goto record_it;
 952                         }
 953
 954                         /* Rule 1: Prefer same address */
 955                         if (hiscore.rule < 1) {
 956                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 957                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 958                                 hiscore.rule++;
 959                         }
 960                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 961                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 962                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 963                                         score.rule = 1;
 964                                         goto record_it;
 965                                 }
 966                         } else {
 967                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 968                                         continue;
 969                         }
 970
 971                         /* Rule 2: Prefer appropriate scope */
 972                         if (hiscore.rule < 2) {
 973                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 974                                 hiscore.rule++;
 975                         }
 976                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 977                         if (hiscore.scope < score.scope) {
 978                                 if (hiscore.scope < daddr_scope) {
 979                                         score.rule = 2;
 980                                         goto record_it;
 981                                 } else
 982                                         continue;
 983                         } else if (score.scope < hiscore.scope) {
 984                                 if (score.scope < daddr_scope)
 985                                         continue;
 986                                 else {
 987                                         score.rule = 2;
 988                                         goto record_it;
 989                                 }
 990                         }
 991
 992                         /* Rule 3: Avoid deprecated address */
 993                         if (hiscore.rule < 3) {
 994                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 995                                     !(ifa_result->flags & IFA_F_DEPRECATED))
 996                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 997                                 hiscore.rule++;
 998                         }
 999                         if (ipv6_saddr_preferred(score.addr_type) ||
1000                             !(ifa->flags & IFA_F_DEPRECATED)) {
1001                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1002                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1003                                         score.rule = 3;
1004                                         goto record_it;
1005                                 }
1006                         } else {
1007                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1008                                         continue;
1009                         }
1010
1011                         /* Rule 4: Prefer home address -- not implemented yet */
1012                         if (hiscore.rule < 4)
1013                                 hiscore.rule++;
1014
1015                         /* Rule 5: Prefer outgoing interface */
1016                         if (hiscore.rule < 5) {
1017                                 if (daddr_dev == NULL ||
1018                                     daddr_dev == ifa_result->idev->dev)
1019                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1020                                 hiscore.rule++;
1021                         }
1022                         if (daddr_dev == NULL ||
1023                             daddr_dev == ifa->idev->dev) {
1024                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1025                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1026                                         score.rule = 5;
1027                                         goto record_it;
1028                                 }
1029                         } else {
1030                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1031                                         continue;
1032                         }
1033
1034                         /* Rule 6: Prefer matching label */
1035                         if (hiscore.rule < 6) {
1036                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1037                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1038                                 hiscore.rule++;
1039                         }
1040                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1041                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1042                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1043                                         score.rule = 6;
1044                                         goto record_it;
1045                                 }
1046                         } else {
1047                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1048                                         continue;
1049                         }
1050
1051 #ifdef CONFIG_IPV6_PRIVACY
1052                         /* Rule 7: Prefer public address
1053                          * Note: prefer temprary address if use_tempaddr >= 2
1054                          */
1055                         if (hiscore.rule < 7) {
1056                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1057                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1058                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1059                                 hiscore.rule++;
1060                         }
1061                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1062                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1063                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1064                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1065                                         score.rule = 7;
1066                                         goto record_it;
1067                                 }
1068                         } else {
1069                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1070                                         continue;
1071                         }
1072 #endif
1073                         /* Rule 8: Use longest matching prefix */
1074                         if (hiscore.rule < 8) {
1075                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1076                                 hiscore.rule++;
1077                         }
1078                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1079                         if (score.matchlen > hiscore.matchlen) {
1080                                 score.rule = 8;
1081                                 goto record_it;
1082                         }
1083 #if 0
1084                         else if (score.matchlen < hiscore.matchlen)
1085                                 continue;
1086 #endif
1087
1088                         /* Final Rule: choose first available one */
1089                         continue;
1090 record_it:
1091                         if (ifa_result)
1092                                 in6_ifa_put(ifa_result);
1093                         in6_ifa_hold(ifa);
1094                         ifa_result = ifa;
1095                         hiscore = score;
1096                 }
1097                 read_unlock_bh(&idev->lock);
1098         }
1099         read_unlock(&addrconf_lock);
1100         read_unlock(&dev_base_lock);
1101
1102         if (!ifa_result)
1103                 return -EADDRNOTAVAIL;
1104
1105         ipv6_addr_copy(saddr, &ifa_result->addr);
1106         in6_ifa_put(ifa_result);
1107         return 0;
1108 }
1109
1110
1111 int ipv6_get_saddr(struct dst_entry *dst,
1112                    struct in6_addr *daddr, struct in6_addr *saddr)
1113 {
1114         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1115 }
1116
1117
1118 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1119 {
1120         struct inet6_dev *idev;
1121         int err = -EADDRNOTAVAIL;
1122
1123         read_lock(&addrconf_lock);
1124         if ((idev = __in6_dev_get(dev)) != NULL) {
1125                 struct inet6_ifaddr *ifp;
1126
1127                 read_lock_bh(&idev->lock);
1128                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1129                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1130                                 ipv6_addr_copy(addr, &ifp->addr);
1131                                 err = 0;
1132                                 break;
1133                         }
1134                 }
1135                 read_unlock_bh(&idev->lock);
1136         }
1137         read_unlock(&addrconf_lock);
1138         return err;
1139 }
1140
1141 static int ipv6_count_addresses(struct inet6_dev *idev)
1142 {
1143         int cnt = 0;
1144         struct inet6_ifaddr *ifp;
1145
1146         read_lock_bh(&idev->lock);
1147         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1148                 cnt++;
1149         read_unlock_bh(&idev->lock);
1150         return cnt;
1151 }
1152
1153 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1154 {
1155         struct inet6_ifaddr * ifp;
1156         u8 hash = ipv6_addr_hash(addr);
1157
1158         read_lock_bh(&addrconf_hash_lock);
1159         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1160                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1161                     !(ifp->flags&IFA_F_TENTATIVE)) {
1162                         if (dev == NULL || ifp->idev->dev == dev ||
1163                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1164                                 break;
1165                 }
1166         }
1167         read_unlock_bh(&addrconf_hash_lock);
1168         return ifp != NULL;
1169 }
1170
1171 static
1172 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1173 {
1174         struct inet6_ifaddr * ifp;
1175         u8 hash = ipv6_addr_hash(addr);
1176
1177         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1178                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1179                         if (dev == NULL || ifp->idev->dev == dev)
1180                                 break;
1181                 }
1182         }
1183         return ifp != NULL;
1184 }
1185
1186 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1187 {
1188         struct inet6_ifaddr * ifp;
1189         u8 hash = ipv6_addr_hash(addr);
1190
1191         read_lock_bh(&addrconf_hash_lock);
1192         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1193                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1194                         if (dev == NULL || ifp->idev->dev == dev ||
1195                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1196                                 in6_ifa_hold(ifp);
1197                                 break;
1198                         }
1199                 }
1200         }
1201         read_unlock_bh(&addrconf_hash_lock);
1202
1203         return ifp;
1204 }
1205
1206 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1207 {
1208         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1209         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1210         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1211         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1212         int sk_ipv6only = ipv6_only_sock(sk);
1213         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1214         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1215         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1216
1217         if (!sk2_rcv_saddr && !sk_ipv6only)
1218                 return 1;
1219
1220         if (addr_type2 == IPV6_ADDR_ANY &&
1221             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1222                 return 1;
1223
1224         if (addr_type == IPV6_ADDR_ANY &&
1225             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1226                 return 1;
1227
1228         if (sk2_rcv_saddr6 &&
1229             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1230                 return 1;
1231
1232         if (addr_type == IPV6_ADDR_MAPPED &&
1233             !sk2_ipv6only &&
1234             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1235                 return 1;
1236
1237         return 0;
1238 }
1239
1240 /* Gets referenced address, destroys ifaddr */
1241
1242 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1243 {
1244         if (ifp->flags&IFA_F_PERMANENT) {
1245                 spin_lock_bh(&ifp->lock);
1246                 addrconf_del_timer(ifp);
1247                 ifp->flags |= IFA_F_TENTATIVE;
1248                 spin_unlock_bh(&ifp->lock);
1249                 in6_ifa_put(ifp);
1250 #ifdef CONFIG_IPV6_PRIVACY
1251         } else if (ifp->flags&IFA_F_TEMPORARY) {
1252                 struct inet6_ifaddr *ifpub;
1253                 spin_lock_bh(&ifp->lock);
1254                 ifpub = ifp->ifpub;
1255                 if (ifpub) {
1256                         in6_ifa_hold(ifpub);
1257                         spin_unlock_bh(&ifp->lock);
1258                         ipv6_create_tempaddr(ifpub, ifp);
1259                         in6_ifa_put(ifpub);
1260                 } else {
1261                         spin_unlock_bh(&ifp->lock);
1262                 }
1263                 ipv6_del_addr(ifp);
1264 #endif
1265         } else
1266                 ipv6_del_addr(ifp);
1267 }
1268
1269 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1270 {
1271         if (net_ratelimit())
1272                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1273         addrconf_dad_stop(ifp);
1274 }
1275
1276 /* Join to solicited addr multicast group. */
1277
1278 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1279 {
1280         struct in6_addr maddr;
1281
1282         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1283                 return;
1284
1285         addrconf_addr_solict_mult(addr, &maddr);
1286         ipv6_dev_mc_inc(dev, &maddr);
1287 }
1288
1289 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1290 {
1291         struct in6_addr maddr;
1292
1293         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1294                 return;
1295
1296         addrconf_addr_solict_mult(addr, &maddr);
1297         __ipv6_dev_mc_dec(idev, &maddr);
1298 }
1299
1300 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1301 {
1302         struct in6_addr addr;
1303         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1304         if (ipv6_addr_any(&addr))
1305                 return;
1306         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1307 }
1308
1309 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1310 {
1311         struct in6_addr addr;
1312         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1313         if (ipv6_addr_any(&addr))
1314                 return;
1315         __ipv6_dev_ac_dec(ifp->idev, &addr);
1316 }
1317
1318 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1319 {
1320         if (dev->addr_len != ETH_ALEN)
1321                 return -1;
1322         memcpy(eui, dev->dev_addr, 3);
1323         memcpy(eui + 5, dev->dev_addr + 3, 3);
1324
1325         /*
1326          * The zSeries OSA network cards can be shared among various
1327          * OS instances, but the OSA cards have only one MAC address.
1328          * This leads to duplicate address conflicts in conjunction
1329          * with IPv6 if more than one instance uses the same card.
1330          *
1331          * The driver for these cards can deliver a unique 16-bit
1332          * identifier for each instance sharing the same card.  It is
1333          * placed instead of 0xFFFE in the interface identifier.  The
1334          * "u" bit of the interface identifier is not inverted in this
1335          * case.  Hence the resulting interface identifier has local
1336          * scope according to RFC2373.
1337          */
1338         if (dev->dev_id) {
1339                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1340                 eui[4] = dev->dev_id & 0xFF;
1341         } else {
1342                 eui[3] = 0xFF;
1343                 eui[4] = 0xFE;
1344                 eui[0] ^= 2;
1345         }
1346         return 0;
1347 }
1348
1349 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1350 {
1351         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1352         if (dev->addr_len != ARCNET_ALEN)
1353                 return -1;
1354         memset(eui, 0, 7);
1355         eui[7] = *(u8*)dev->dev_addr;
1356         return 0;
1357 }
1358
1359 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1360 {
1361         if (dev->addr_len != INFINIBAND_ALEN)
1362                 return -1;
1363         memcpy(eui, dev->dev_addr + 12, 8);
1364         eui[0] |= 2;
1365         return 0;
1366 }
1367
1368 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1369 {
1370         switch (dev->type) {
1371         case ARPHRD_ETHER:
1372         case ARPHRD_FDDI:
1373         case ARPHRD_IEEE802_TR:
1374                 return addrconf_ifid_eui48(eui, dev);
1375         case ARPHRD_ARCNET:
1376                 return addrconf_ifid_arcnet(eui, dev);
1377         case ARPHRD_INFINIBAND:
1378                 return addrconf_ifid_infiniband(eui, dev);
1379         }
1380         return -1;
1381 }
1382
1383 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1384 {
1385         int err = -1;
1386         struct inet6_ifaddr *ifp;
1387
1388         read_lock_bh(&idev->lock);
1389         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1390                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1391                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1392                         err = 0;
1393                         break;
1394                 }
1395         }
1396         read_unlock_bh(&idev->lock);
1397         return err;
1398 }
1399
1400 #ifdef CONFIG_IPV6_PRIVACY
1401 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1402 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1403 {
1404 regen:
1405         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1406         idev->rndid[0] &= ~0x02;
1407
1408         /*
1409          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1410          * check if generated address is not inappropriate
1411          *
1412          *  - Reserved subnet anycast (RFC 2526)
1413          *      11111101 11....11 1xxxxxxx
1414          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1415          *      00-00-5E-FE-xx-xx-xx-xx
1416          *  - value 0
1417          *  - XXX: already assigned to an address on the device
1418          */
1419         if (idev->rndid[0] == 0xfd &&
1420             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1421             (idev->rndid[7]&0x80))
1422                 goto regen;
1423         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1424                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1425                         goto regen;
1426                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1427                         goto regen;
1428         }
1429
1430         return 0;
1431 }
1432
1433 static void ipv6_regen_rndid(unsigned long data)
1434 {
1435         struct inet6_dev *idev = (struct inet6_dev *) data;
1436         unsigned long expires;
1437
1438         read_lock_bh(&addrconf_lock);
1439         write_lock_bh(&idev->lock);
1440
1441         if (idev->dead)
1442                 goto out;
1443
1444         if (__ipv6_regen_rndid(idev) < 0)
1445                 goto out;
1446
1447         expires = jiffies +
1448                 idev->cnf.temp_prefered_lft * HZ -
1449                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1450         if (time_before(expires, jiffies)) {
1451                 printk(KERN_WARNING
1452                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1453                         idev->dev->name);
1454                 goto out;
1455         }
1456
1457         if (!mod_timer(&idev->regen_timer, expires))
1458                 in6_dev_hold(idev);
1459
1460 out:
1461         write_unlock_bh(&idev->lock);
1462         read_unlock_bh(&addrconf_lock);
1463         in6_dev_put(idev);
1464 }
1465
1466 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1467         int ret = 0;
1468
1469         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1470                 ret = __ipv6_regen_rndid(idev);
1471         return ret;
1472 }
1473 #endif
1474
1475 /*
1476  *      Add prefix route.
1477  */
1478
1479 static void
1480 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1481                       unsigned long expires, u32 flags)
1482 {
1483         struct in6_rtmsg rtmsg;
1484
1485         memset(&rtmsg, 0, sizeof(rtmsg));
1486         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1487         rtmsg.rtmsg_dst_len = plen;
1488         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1489         rtmsg.rtmsg_ifindex = dev->ifindex;
1490         rtmsg.rtmsg_info = expires;
1491         rtmsg.rtmsg_flags = RTF_UP|flags;
1492         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1493
1494         /* Prevent useless cloning on PtP SIT.
1495            This thing is done here expecting that the whole
1496            class of non-broadcast devices need not cloning.
1497          */
1498         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1499                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1500
1501         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1502 }
1503
1504 /* Create "default" multicast route to the interface */
1505
1506 static void addrconf_add_mroute(struct net_device *dev)
1507 {
1508         struct in6_rtmsg rtmsg;
1509
1510         memset(&rtmsg, 0, sizeof(rtmsg));
1511         ipv6_addr_set(&rtmsg.rtmsg_dst,
1512                       htonl(0xFF000000), 0, 0, 0);
1513         rtmsg.rtmsg_dst_len = 8;
1514         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1515         rtmsg.rtmsg_ifindex = dev->ifindex;
1516         rtmsg.rtmsg_flags = RTF_UP;
1517         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1518         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1519 }
1520
1521 static void sit_route_add(struct net_device *dev)
1522 {
1523         struct in6_rtmsg rtmsg;
1524
1525         memset(&rtmsg, 0, sizeof(rtmsg));
1526
1527         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1528         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1529
1530         /* prefix length - 96 bits "::d.d.d.d" */
1531         rtmsg.rtmsg_dst_len     = 96;
1532         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1533         rtmsg.rtmsg_ifindex     = dev->ifindex;
1534
1535         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1536 }
1537
1538 static void addrconf_add_lroute(struct net_device *dev)
1539 {
1540         struct in6_addr addr;
1541
1542         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1543         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1544 }
1545
1546 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1547 {
1548         struct inet6_dev *idev;
1549
1550         ASSERT_RTNL();
1551
1552         if ((idev = ipv6_find_idev(dev)) == NULL)
1553                 return NULL;
1554
1555         /* Add default multicast route */
1556         addrconf_add_mroute(dev);
1557
1558         /* Add link local route */
1559         addrconf_add_lroute(dev);
1560         return idev;
1561 }
1562
1563 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1564 {
1565         struct prefix_info *pinfo;
1566         __u32 valid_lft;
1567         __u32 prefered_lft;
1568         int addr_type;
1569         unsigned long rt_expires;
1570         struct inet6_dev *in6_dev;
1571
1572         pinfo = (struct prefix_info *) opt;
1573
1574         if (len < sizeof(struct prefix_info)) {
1575                 ADBG(("addrconf: prefix option too short\n"));
1576                 return;
1577         }
1578
1579         /*
1580          *      Validation checks ([ADDRCONF], page 19)
1581          */
1582
1583         addr_type = ipv6_addr_type(&pinfo->prefix);
1584
1585         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1586                 return;
1587
1588         valid_lft = ntohl(pinfo->valid);
1589         prefered_lft = ntohl(pinfo->prefered);
1590
1591         if (prefered_lft > valid_lft) {
1592                 if (net_ratelimit())
1593                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1594                 return;
1595         }
1596
1597         in6_dev = in6_dev_get(dev);
1598
1599         if (in6_dev == NULL) {
1600                 if (net_ratelimit())
1601                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1602                 return;
1603         }
1604
1605         /*
1606          *      Two things going on here:
1607          *      1) Add routes for on-link prefixes
1608          *      2) Configure prefixes with the auto flag set
1609          */
1610
1611         /* Avoid arithmetic overflow. Really, we could
1612            save rt_expires in seconds, likely valid_lft,
1613            but it would require division in fib gc, that it
1614            not good.
1615          */
1616         if (valid_lft >= 0x7FFFFFFF/HZ)
1617                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1618         else
1619                 rt_expires = valid_lft * HZ;
1620
1621         /*
1622          * We convert this (in jiffies) to clock_t later.
1623          * Avoid arithmetic overflow there as well.
1624          * Overflow can happen only if HZ < USER_HZ.
1625          */
1626         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1627                 rt_expires = 0x7FFFFFFF / USER_HZ;
1628
1629         if (pinfo->onlink) {
1630                 struct rt6_info *rt;
1631                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1632
1633                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1634                         if (rt->rt6i_flags&RTF_EXPIRES) {
1635                                 if (valid_lft == 0) {
1636                                         ip6_del_rt(rt, NULL, NULL, NULL);
1637                                         rt = NULL;
1638                                 } else {
1639                                         rt->rt6i_expires = jiffies + rt_expires;
1640                                 }
1641                         }
1642                 } else if (valid_lft) {
1643                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1644                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1645                 }
1646                 if (rt)
1647                         dst_release(&rt->u.dst);
1648         }
1649
1650         /* Try to figure out our local address for this prefix */
1651
1652         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1653                 struct inet6_ifaddr * ifp;
1654                 struct in6_addr addr;
1655                 int create = 0, update_lft = 0;
1656
1657                 if (pinfo->prefix_len == 64) {
1658                         memcpy(&addr, &pinfo->prefix, 8);
1659                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1660                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1661                                 in6_dev_put(in6_dev);
1662                                 return;
1663                         }
1664                         goto ok;
1665                 }
1666                 if (net_ratelimit())
1667                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1668                                pinfo->prefix_len);
1669                 in6_dev_put(in6_dev);
1670                 return;
1671
1672 ok:
1673
1674                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1675
1676                 if (ifp == NULL && valid_lft) {
1677                         int max_addresses = in6_dev->cnf.max_addresses;
1678
1679                         /* Do not allow to create too much of autoconfigured
1680                          * addresses; this would be too easy way to crash kernel.
1681                          */
1682                         if (!max_addresses ||
1683                             ipv6_count_addresses(in6_dev) < max_addresses)
1684                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1685                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1686
1687                         if (!ifp || IS_ERR(ifp)) {
1688                                 in6_dev_put(in6_dev);
1689                                 return;
1690                         }
1691
1692                         update_lft = create = 1;
1693                         ifp->cstamp = jiffies;
1694                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1695                 }
1696
1697                 if (ifp) {
1698                         int flags;
1699                         unsigned long now;
1700 #ifdef CONFIG_IPV6_PRIVACY
1701                         struct inet6_ifaddr *ift;
1702 #endif
1703                         u32 stored_lft;
1704
1705                         /* update lifetime (RFC2462 5.5.3 e) */
1706                         spin_lock(&ifp->lock);
1707                         now = jiffies;
1708                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1709                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1710                         else
1711                                 stored_lft = 0;
1712                         if (!update_lft && stored_lft) {
1713                                 if (valid_lft > MIN_VALID_LIFETIME ||
1714                                     valid_lft > stored_lft)
1715                                         update_lft = 1;
1716                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1717                                         /* valid_lft <= stored_lft is always true */
1718                                         /* XXX: IPsec */
1719                                         update_lft = 0;
1720                                 } else {
1721                                         valid_lft = MIN_VALID_LIFETIME;
1722                                         if (valid_lft < prefered_lft)
1723                                                 prefered_lft = valid_lft;
1724                                         update_lft = 1;
1725                                 }
1726                         }
1727
1728                         if (update_lft) {
1729                                 ifp->valid_lft = valid_lft;
1730                                 ifp->prefered_lft = prefered_lft;
1731                                 ifp->tstamp = now;
1732                                 flags = ifp->flags;
1733                                 ifp->flags &= ~IFA_F_DEPRECATED;
1734                                 spin_unlock(&ifp->lock);
1735
1736                                 if (!(flags&IFA_F_TENTATIVE))
1737                                         ipv6_ifa_notify(0, ifp);
1738                         } else
1739                                 spin_unlock(&ifp->lock);
1740
1741 #ifdef CONFIG_IPV6_PRIVACY
1742                         read_lock_bh(&in6_dev->lock);
1743                         /* update all temporary addresses in the list */
1744                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1745                                 /*
1746                                  * When adjusting the lifetimes of an existing
1747                                  * temporary address, only lower the lifetimes.
1748                                  * Implementations must not increase the
1749                                  * lifetimes of an existing temporary address
1750                                  * when processing a Prefix Information Option.
1751                                  */
1752                                 spin_lock(&ift->lock);
1753                                 flags = ift->flags;
1754                                 if (ift->valid_lft > valid_lft &&
1755                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1756                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1757                                 if (ift->prefered_lft > prefered_lft &&
1758                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1759                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1760                                 spin_unlock(&ift->lock);
1761                                 if (!(flags&IFA_F_TENTATIVE))
1762                                         ipv6_ifa_notify(0, ift);
1763                         }
1764
1765                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1766                                 /*
1767                                  * When a new public address is created as described in [ADDRCONF],
1768                                  * also create a new temporary address.
1769                                  */
1770                                 read_unlock_bh(&in6_dev->lock);
1771                                 ipv6_create_tempaddr(ifp, NULL);
1772                         } else {
1773                                 read_unlock_bh(&in6_dev->lock);
1774                         }
1775 #endif
1776                         in6_ifa_put(ifp);
1777                         addrconf_verify(0);
1778                 }
1779         }
1780         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1781         in6_dev_put(in6_dev);
1782 }
1783
1784 /*
1785  *      Set destination address.
1786  *      Special case for SIT interfaces where we create a new "virtual"
1787  *      device.
1788  */
1789 int addrconf_set_dstaddr(void __user *arg)
1790 {
1791         struct in6_ifreq ireq;
1792         struct net_device *dev;
1793         int err = -EINVAL;
1794
1795         rtnl_lock();
1796
1797         err = -EFAULT;
1798         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1799                 goto err_exit;
1800
1801         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1802
1803         err = -ENODEV;
1804         if (dev == NULL)
1805                 goto err_exit;
1806
1807         if (dev->type == ARPHRD_SIT) {
1808                 struct ifreq ifr;
1809                 mm_segment_t    oldfs;
1810                 struct ip_tunnel_parm p;
1811
1812                 err = -EADDRNOTAVAIL;
1813                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1814                         goto err_exit;
1815
1816                 memset(&p, 0, sizeof(p));
1817                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1818                 p.iph.saddr = 0;
1819                 p.iph.version = 4;
1820                 p.iph.ihl = 5;
1821                 p.iph.protocol = IPPROTO_IPV6;
1822                 p.iph.ttl = 64;
1823                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1824
1825                 oldfs = get_fs(); set_fs(KERNEL_DS);
1826                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1827                 set_fs(oldfs);
1828
1829                 if (err == 0) {
1830                         err = -ENOBUFS;
1831                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1832                                 goto err_exit;
1833                         err = dev_open(dev);
1834                 }
1835         }
1836
1837 err_exit:
1838         rtnl_unlock();
1839         return err;
1840 }
1841
1842 /*
1843  *      Manual configuration of address on an interface
1844  */
1845 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1846 {
1847         struct inet6_ifaddr *ifp;
1848         struct inet6_dev *idev;
1849         struct net_device *dev;
1850         int scope;
1851
1852         ASSERT_RTNL();
1853
1854         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1855                 return -ENODEV;
1856
1857         if (!(dev->flags&IFF_UP))
1858                 return -ENETDOWN;
1859
1860         if ((idev = addrconf_add_dev(dev)) == NULL)
1861                 return -ENOBUFS;
1862
1863         scope = ipv6_addr_scope(pfx);
1864
1865         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1866         if (!IS_ERR(ifp)) {
1867                 addrconf_dad_start(ifp, 0);
1868                 in6_ifa_put(ifp);
1869                 return 0;
1870         }
1871
1872         return PTR_ERR(ifp);
1873 }
1874
1875 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1876 {
1877         struct inet6_ifaddr *ifp;
1878         struct inet6_dev *idev;
1879         struct net_device *dev;
1880
1881         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1882                 return -ENODEV;
1883
1884         if ((idev = __in6_dev_get(dev)) == NULL)
1885                 return -ENXIO;
1886
1887         read_lock_bh(&idev->lock);
1888         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1889                 if (ifp->prefix_len == plen &&
1890                     ipv6_addr_equal(pfx, &ifp->addr)) {
1891                         in6_ifa_hold(ifp);
1892                         read_unlock_bh(&idev->lock);
1893
1894                         ipv6_del_addr(ifp);
1895
1896                         /* If the last address is deleted administratively,
1897                            disable IPv6 on this interface.
1898                          */
1899                         if (idev->addr_list == NULL)
1900                                 addrconf_ifdown(idev->dev, 1);
1901                         return 0;
1902                 }
1903         }
1904         read_unlock_bh(&idev->lock);
1905         return -EADDRNOTAVAIL;
1906 }
1907
1908
1909 int addrconf_add_ifaddr(void __user *arg)
1910 {
1911         struct in6_ifreq ireq;
1912         int err;
1913
1914         if (!capable(CAP_NET_ADMIN))
1915                 return -EPERM;
1916
1917         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1918                 return -EFAULT;
1919
1920         rtnl_lock();
1921         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1922         rtnl_unlock();
1923         return err;
1924 }
1925
1926 int addrconf_del_ifaddr(void __user *arg)
1927 {
1928         struct in6_ifreq ireq;
1929         int err;
1930
1931         if (!capable(CAP_NET_ADMIN))
1932                 return -EPERM;
1933
1934         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1935                 return -EFAULT;
1936
1937         rtnl_lock();
1938         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1939         rtnl_unlock();
1940         return err;
1941 }
1942
1943 static void sit_add_v4_addrs(struct inet6_dev *idev)
1944 {
1945         struct inet6_ifaddr * ifp;
1946         struct in6_addr addr;
1947         struct net_device *dev;
1948         int scope;
1949
1950         ASSERT_RTNL();
1951
1952         memset(&addr, 0, sizeof(struct in6_addr));
1953         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1954
1955         if (idev->dev->flags&IFF_POINTOPOINT) {
1956                 addr.s6_addr32[0] = htonl(0xfe800000);
1957                 scope = IFA_LINK;
1958         } else {
1959                 scope = IPV6_ADDR_COMPATv4;
1960         }
1961
1962         if (addr.s6_addr32[3]) {
1963                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1964                 if (!IS_ERR(ifp)) {
1965                         spin_lock_bh(&ifp->lock);
1966                         ifp->flags &= ~IFA_F_TENTATIVE;
1967                         spin_unlock_bh(&ifp->lock);
1968                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1969                         in6_ifa_put(ifp);
1970                 }
1971                 return;
1972         }
1973
1974         for (dev = dev_base; dev != NULL; dev = dev->next) {
1975                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1976                 if (in_dev && (dev->flags & IFF_UP)) {
1977                         struct in_ifaddr * ifa;
1978
1979                         int flag = scope;
1980
1981                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1982                                 int plen;
1983
1984                                 addr.s6_addr32[3] = ifa->ifa_local;
1985
1986                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1987                                         continue;
1988                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1989                                         if (idev->dev->flags&IFF_POINTOPOINT)
1990                                                 continue;
1991                                         flag |= IFA_HOST;
1992                                 }
1993                                 if (idev->dev->flags&IFF_POINTOPOINT)
1994                                         plen = 64;
1995                                 else
1996                                         plen = 96;
1997
1998                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1999                                                     IFA_F_PERMANENT);
2000                                 if (!IS_ERR(ifp)) {
2001                                         spin_lock_bh(&ifp->lock);
2002                                         ifp->flags &= ~IFA_F_TENTATIVE;
2003                                         spin_unlock_bh(&ifp->lock);
2004                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2005                                         in6_ifa_put(ifp);
2006                                 }
2007                         }
2008                 }
2009         }
2010 }
2011
2012 static void init_loopback(struct net_device *dev)
2013 {
2014         struct inet6_dev  *idev;
2015         struct inet6_ifaddr * ifp;
2016
2017         /* ::1 */
2018
2019         ASSERT_RTNL();
2020
2021         if ((idev = ipv6_find_idev(dev)) == NULL) {
2022                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2023                 return;
2024         }
2025
2026         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2027         if (!IS_ERR(ifp)) {
2028                 spin_lock_bh(&ifp->lock);
2029                 ifp->flags &= ~IFA_F_TENTATIVE;
2030                 spin_unlock_bh(&ifp->lock);
2031                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2032                 in6_ifa_put(ifp);
2033         }
2034 }
2035
2036 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2037 {
2038         struct inet6_ifaddr * ifp;
2039
2040         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2041         if (!IS_ERR(ifp)) {
2042                 addrconf_dad_start(ifp, 0);
2043                 in6_ifa_put(ifp);
2044         }
2045 }
2046
2047 static void addrconf_dev_config(struct net_device *dev)
2048 {
2049         struct in6_addr addr;
2050         struct inet6_dev    * idev;
2051
2052         ASSERT_RTNL();
2053
2054         if ((dev->type != ARPHRD_ETHER) &&
2055             (dev->type != ARPHRD_FDDI) &&
2056             (dev->type != ARPHRD_IEEE802_TR) &&
2057             (dev->type != ARPHRD_ARCNET) &&
2058             (dev->type != ARPHRD_INFINIBAND)) {
2059                 /* Alas, we support only Ethernet autoconfiguration. */
2060                 return;
2061         }
2062
2063         idev = addrconf_add_dev(dev);
2064         if (idev == NULL)
2065                 return;
2066
2067         memset(&addr, 0, sizeof(struct in6_addr));
2068         addr.s6_addr32[0] = htonl(0xFE800000);
2069
2070         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2071                 addrconf_add_linklocal(idev, &addr);
2072 }
2073
2074 static void addrconf_sit_config(struct net_device *dev)
2075 {
2076         struct inet6_dev *idev;
2077
2078         ASSERT_RTNL();
2079
2080         /*
2081          * Configure the tunnel with one of our IPv4
2082          * addresses... we should configure all of
2083          * our v4 addrs in the tunnel
2084          */
2085
2086         if ((idev = ipv6_find_idev(dev)) == NULL) {
2087                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2088                 return;
2089         }
2090
2091         sit_add_v4_addrs(idev);
2092
2093         if (dev->flags&IFF_POINTOPOINT) {
2094                 addrconf_add_mroute(dev);
2095                 addrconf_add_lroute(dev);
2096         } else
2097                 sit_route_add(dev);
2098 }
2099
2100 static inline int
2101 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2102 {
2103         struct in6_addr lladdr;
2104
2105         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2106                 addrconf_add_linklocal(idev, &lladdr);
2107                 return 0;
2108         }
2109         return -1;
2110 }
2111
2112 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2113 {
2114         struct net_device *link_dev;
2115
2116         /* first try to inherit the link-local address from the link device */
2117         if (idev->dev->iflink &&
2118             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2119                 if (!ipv6_inherit_linklocal(idev, link_dev))
2120                         return;
2121         }
2122         /* then try to inherit it from any device */
2123         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2124                 if (!ipv6_inherit_linklocal(idev, link_dev))
2125                         return;
2126         }
2127         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2128 }
2129
2130 /*
2131  * Autoconfigure tunnel with a link-local address so routing protocols,
2132  * DHCPv6, MLD etc. can be run over the virtual link
2133  */
2134
2135 static void addrconf_ip6_tnl_config(struct net_device *dev)
2136 {
2137         struct inet6_dev *idev;
2138
2139         ASSERT_RTNL();
2140
2141         if ((idev = addrconf_add_dev(dev)) == NULL) {
2142                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2143                 return;
2144         }
2145         ip6_tnl_add_linklocal(idev);
2146 }
2147
2148 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2149                            void * data)
2150 {
2151         struct net_device *dev = (struct net_device *) data;
2152         struct inet6_dev *idev = __in6_dev_get(dev);
2153         int run_pending = 0;
2154
2155         switch(event) {
2156         case NETDEV_UP:
2157         case NETDEV_CHANGE:
2158                 if (event == NETDEV_UP) {
2159                         if (!netif_carrier_ok(dev)) {
2160                                 /* device is not ready yet. */
2161                                 printk(KERN_INFO
2162                                         "ADDRCONF(NETDEV_UP): %s: "
2163                                         "link is not ready\n",
2164                                         dev->name);
2165                                 break;
2166                         }
2167
2168                         if (idev)
2169                                 idev->if_flags |= IF_READY;
2170                 } else {
2171                         if (!netif_carrier_ok(dev)) {
2172                                 /* device is still not ready. */
2173                                 break;
2174                         }
2175
2176                         if (idev) {
2177                                 if (idev->if_flags & IF_READY) {
2178                                         /* device is already configured. */
2179                                         break;
2180                                 }
2181                                 idev->if_flags |= IF_READY;
2182                         }
2183
2184                         printk(KERN_INFO
2185                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2186                                         "link becomes ready\n",
2187                                         dev->name);
2188
2189                         run_pending = 1;
2190                 }
2191
2192                 switch(dev->type) {
2193                 case ARPHRD_SIT:
2194                         addrconf_sit_config(dev);
2195                         break;
2196                 case ARPHRD_TUNNEL6:
2197                         addrconf_ip6_tnl_config(dev);
2198                         break;
2199                 case ARPHRD_LOOPBACK:
2200                         init_loopback(dev);
2201                         break;
2202
2203                 default:
2204                         addrconf_dev_config(dev);
2205                         break;
2206                 };
2207                 if (idev) {
2208                         if (run_pending)
2209                                 addrconf_dad_run(idev);
2210
2211                         /* If the MTU changed during the interface down, when the
2212                            interface up, the changed MTU must be reflected in the
2213                            idev as well as routers.
2214                          */
2215                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2216                                 rt6_mtu_change(dev, dev->mtu);
2217                                 idev->cnf.mtu6 = dev->mtu;
2218                         }
2219                         idev->tstamp = jiffies;
2220                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2221                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2222                            stop IPv6 on this interface.
2223                          */
2224                         if (dev->mtu < IPV6_MIN_MTU)
2225                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2226                 }
2227                 break;
2228
2229         case NETDEV_CHANGEMTU:
2230                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2231                         rt6_mtu_change(dev, dev->mtu);
2232                         idev->cnf.mtu6 = dev->mtu;
2233                         break;
2234                 }
2235
2236                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2237
2238         case NETDEV_DOWN:
2239         case NETDEV_UNREGISTER:
2240                 /*
2241                  *      Remove all addresses from this interface.
2242                  */
2243                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2244                 break;
2245
2246         case NETDEV_CHANGENAME:
2247 #ifdef CONFIG_SYSCTL
2248                 if (idev) {
2249                         addrconf_sysctl_unregister(&idev->cnf);
2250                         neigh_sysctl_unregister(idev->nd_parms);
2251                         neigh_sysctl_register(dev, idev->nd_parms,
2252                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2253                                               &ndisc_ifinfo_sysctl_change,
2254                                               NULL);
2255                         addrconf_sysctl_register(idev, &idev->cnf);
2256                 }
2257 #endif
2258                 break;
2259         };
2260
2261         return NOTIFY_OK;
2262 }
2263
2264 /*
2265  *      addrconf module should be notified of a device going up
2266  */
2267 static struct notifier_block ipv6_dev_notf = {
2268         .notifier_call = addrconf_notify,
2269         .priority = 0
2270 };
2271
2272 static int addrconf_ifdown(struct net_device *dev, int how)
2273 {
2274         struct inet6_dev *idev;
2275         struct inet6_ifaddr *ifa, **bifa;
2276         int i;
2277
2278         ASSERT_RTNL();
2279
2280         if (dev == &loopback_dev && how == 1)
2281                 how = 0;
2282
2283         rt6_ifdown(dev);
2284         neigh_ifdown(&nd_tbl, dev);
2285
2286         idev = __in6_dev_get(dev);
2287         if (idev == NULL)
2288                 return -ENODEV;
2289
2290         /* Step 1: remove reference to ipv6 device from parent device.
2291                    Do not dev_put!
2292          */
2293         if (how == 1) {
2294                 write_lock_bh(&addrconf_lock);
2295                 dev->ip6_ptr = NULL;
2296                 idev->dead = 1;
2297                 write_unlock_bh(&addrconf_lock);
2298
2299                 /* Step 1.5: remove snmp6 entry */
2300                 snmp6_unregister_dev(idev);
2301
2302         }
2303
2304         /* Step 2: clear hash table */
2305         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2306                 bifa = &inet6_addr_lst[i];
2307
2308                 write_lock_bh(&addrconf_hash_lock);
2309                 while ((ifa = *bifa) != NULL) {
2310                         if (ifa->idev == idev) {
2311                                 *bifa = ifa->lst_next;
2312                                 ifa->lst_next = NULL;
2313                                 addrconf_del_timer(ifa);
2314                                 in6_ifa_put(ifa);
2315                                 continue;
2316                         }
2317                         bifa = &ifa->lst_next;
2318                 }
2319                 write_unlock_bh(&addrconf_hash_lock);
2320         }
2321
2322         write_lock_bh(&idev->lock);
2323
2324         /* Step 3: clear flags for stateless addrconf */
2325         if (how != 1)
2326                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2327
2328         /* Step 4: clear address list */
2329 #ifdef CONFIG_IPV6_PRIVACY
2330         if (how == 1 && del_timer(&idev->regen_timer))
2331                 in6_dev_put(idev);
2332
2333         /* clear tempaddr list */
2334         while ((ifa = idev->tempaddr_list) != NULL) {
2335                 idev->tempaddr_list = ifa->tmp_next;
2336                 ifa->tmp_next = NULL;
2337                 ifa->dead = 1;
2338                 write_unlock_bh(&idev->lock);
2339                 spin_lock_bh(&ifa->lock);
2340
2341                 if (ifa->ifpub) {
2342                         in6_ifa_put(ifa->ifpub);
2343                         ifa->ifpub = NULL;
2344                 }
2345                 spin_unlock_bh(&ifa->lock);
2346                 in6_ifa_put(ifa);
2347                 write_lock_bh(&idev->lock);
2348         }
2349 #endif
2350         while ((ifa = idev->addr_list) != NULL) {
2351                 idev->addr_list = ifa->if_next;
2352                 ifa->if_next = NULL;
2353                 ifa->dead = 1;
2354                 addrconf_del_timer(ifa);
2355                 write_unlock_bh(&idev->lock);
2356
2357                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2358                 in6_ifa_put(ifa);
2359
2360                 write_lock_bh(&idev->lock);
2361         }
2362         write_unlock_bh(&idev->lock);
2363
2364         /* Step 5: Discard multicast list */
2365
2366         if (how == 1)
2367                 ipv6_mc_destroy_dev(idev);
2368         else
2369                 ipv6_mc_down(idev);
2370
2371         /* Step 5: netlink notification of this interface */
2372         idev->tstamp = jiffies;
2373         inet6_ifinfo_notify(RTM_DELLINK, idev);
2374
2375         /* Shot the device (if unregistered) */
2376
2377         if (how == 1) {
2378 #ifdef CONFIG_SYSCTL
2379                 addrconf_sysctl_unregister(&idev->cnf);
2380                 neigh_sysctl_unregister(idev->nd_parms);
2381 #endif
2382                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2383                 neigh_ifdown(&nd_tbl, dev);
2384                 in6_dev_put(idev);
2385         }
2386         return 0;
2387 }
2388
2389 static void addrconf_rs_timer(unsigned long data)
2390 {
2391         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2392
2393         if (ifp->idev->cnf.forwarding)
2394                 goto out;
2395
2396         if (ifp->idev->if_flags & IF_RA_RCVD) {
2397                 /*
2398                  *      Announcement received after solicitation
2399                  *      was sent
2400                  */
2401                 goto out;
2402         }
2403
2404         spin_lock(&ifp->lock);
2405         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2406                 struct in6_addr all_routers;
2407
2408                 /* The wait after the last probe can be shorter */
2409                 addrconf_mod_timer(ifp, AC_RS,
2410                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2411                                    ifp->idev->cnf.rtr_solicit_delay :
2412                                    ifp->idev->cnf.rtr_solicit_interval);
2413                 spin_unlock(&ifp->lock);
2414
2415                 ipv6_addr_all_routers(&all_routers);
2416
2417                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2418         } else {
2419                 spin_unlock(&ifp->lock);
2420                 /*
2421                  * Note: we do not support deprecated "all on-link"
2422                  * assumption any longer.
2423                  */
2424                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2425                        ifp->idev->dev->name);
2426         }
2427
2428 out:
2429         in6_ifa_put(ifp);
2430 }
2431
2432 /*
2433  *      Duplicate Address Detection
2434  */
2435 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2436 {
2437         unsigned long rand_num;
2438         struct inet6_dev *idev = ifp->idev;
2439
2440         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2441         ifp->probes = idev->cnf.dad_transmits;
2442         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2443 }
2444
2445 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2446 {
2447         struct inet6_dev *idev = ifp->idev;
2448         struct net_device *dev = idev->dev;
2449
2450         addrconf_join_solict(dev, &ifp->addr);
2451
2452         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2453                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2454                                         flags);
2455
2456         net_srandom(ifp->addr.s6_addr32[3]);
2457
2458         read_lock_bh(&idev->lock);
2459         if (ifp->dead)
2460                 goto out;
2461         spin_lock_bh(&ifp->lock);
2462
2463         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2464             !(ifp->flags&IFA_F_TENTATIVE)) {
2465                 ifp->flags &= ~IFA_F_TENTATIVE;
2466                 spin_unlock_bh(&ifp->lock);
2467                 read_unlock_bh(&idev->lock);
2468
2469                 addrconf_dad_completed(ifp);
2470                 return;
2471         }
2472
2473         if (!(idev->if_flags & IF_READY)) {
2474                 spin_unlock_bh(&ifp->lock);
2475                 read_unlock_bh(&idev->lock);
2476                 /*
2477                  * If the defice is not ready:
2478                  * - keep it tentative if it is a permanent address.
2479                  * - otherwise, kill it.
2480                  */
2481                 in6_ifa_hold(ifp);
2482                 addrconf_dad_stop(ifp);
2483                 return;
2484         }
2485         addrconf_dad_kick(ifp);
2486         spin_unlock_bh(&ifp->lock);
2487 out:
2488         read_unlock_bh(&idev->lock);
2489 }
2490
2491 static void addrconf_dad_timer(unsigned long data)
2492 {
2493         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2494         struct inet6_dev *idev = ifp->idev;
2495         struct in6_addr unspec;
2496         struct in6_addr mcaddr;
2497
2498         read_lock_bh(&idev->lock);
2499         if (idev->dead) {
2500                 read_unlock_bh(&idev->lock);
2501                 goto out;
2502         }
2503         spin_lock_bh(&ifp->lock);
2504         if (ifp->probes == 0) {
2505                 /*
2506                  * DAD was successful
2507                  */
2508
2509                 ifp->flags &= ~IFA_F_TENTATIVE;
2510                 spin_unlock_bh(&ifp->lock);
2511                 read_unlock_bh(&idev->lock);
2512
2513                 addrconf_dad_completed(ifp);
2514
2515                 goto out;
2516         }
2517
2518         ifp->probes--;
2519         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2520         spin_unlock_bh(&ifp->lock);
2521         read_unlock_bh(&idev->lock);
2522
2523         /* send a neighbour solicitation for our addr */
2524         memset(&unspec, 0, sizeof(unspec));
2525         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2526         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2527 out:
2528         in6_ifa_put(ifp);
2529 }
2530
2531 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2532 {
2533         struct net_device *     dev = ifp->idev->dev;
2534
2535         /*
2536          *      Configure the address for reception. Now it is valid.
2537          */
2538
2539         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2540
2541         /* If added prefix is link local and forwarding is off,
2542            start sending router solicitations.
2543          */
2544
2545         if (ifp->idev->cnf.forwarding == 0 &&
2546             ifp->idev->cnf.rtr_solicits > 0 &&
2547             (dev->flags&IFF_LOOPBACK) == 0 &&
2548             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2549                 struct in6_addr all_routers;
2550
2551                 ipv6_addr_all_routers(&all_routers);
2552
2553                 /*
2554                  *      If a host as already performed a random delay
2555                  *      [...] as part of DAD [...] there is no need
2556                  *      to delay again before sending the first RS
2557                  */
2558                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2559
2560                 spin_lock_bh(&ifp->lock);
2561                 ifp->probes = 1;
2562                 ifp->idev->if_flags |= IF_RS_SENT;
2563                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2564                 spin_unlock_bh(&ifp->lock);
2565         }
2566 }
2567
2568 static void addrconf_dad_run(struct inet6_dev *idev) {
2569         struct inet6_ifaddr *ifp;
2570
2571         read_lock_bh(&idev->lock);
2572         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2573                 spin_lock_bh(&ifp->lock);
2574                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2575                         spin_unlock_bh(&ifp->lock);
2576                         continue;
2577                 }
2578                 spin_unlock_bh(&ifp->lock);
2579                 addrconf_dad_kick(ifp);
2580         }
2581         read_unlock_bh(&idev->lock);
2582 }
2583
2584 #ifdef CONFIG_PROC_FS
2585 struct if6_iter_state {
2586         int bucket;
2587 };
2588
2589 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2590 {
2591         struct inet6_ifaddr *ifa = NULL;
2592         struct if6_iter_state *state = seq->private;
2593
2594         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2595                 ifa = inet6_addr_lst[state->bucket];
2596                 if (ifa)
2597                         break;
2598         }
2599         return ifa;
2600 }
2601
2602 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2603 {
2604         struct if6_iter_state *state = seq->private;
2605
2606         ifa = ifa->lst_next;
2607 try_again:
2608         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2609                 ifa = inet6_addr_lst[state->bucket];
2610                 goto try_again;
2611         }
2612         return ifa;
2613 }
2614
2615 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2616 {
2617         struct inet6_ifaddr *ifa = if6_get_first(seq);
2618
2619         if (ifa)
2620                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2621                         --pos;
2622         return pos ? NULL : ifa;
2623 }
2624
2625 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2626 {
2627         read_lock_bh(&addrconf_hash_lock);
2628         return if6_get_idx(seq, *pos);
2629 }
2630
2631 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2632 {
2633         struct inet6_ifaddr *ifa;
2634
2635         ifa = if6_get_next(seq, v);
2636         ++*pos;
2637         return ifa;
2638 }
2639
2640 static void if6_seq_stop(struct seq_file *seq, void *v)
2641 {
2642         read_unlock_bh(&addrconf_hash_lock);
2643 }
2644
2645 static int if6_seq_show(struct seq_file *seq, void *v)
2646 {
2647         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2648         seq_printf(seq,
2649                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2650                    NIP6(ifp->addr),
2651                    ifp->idev->dev->ifindex,
2652                    ifp->prefix_len,
2653                    ifp->scope,
2654                    ifp->flags,
2655                    ifp->idev->dev->name);
2656         return 0;
2657 }
2658
2659 static struct seq_operations if6_seq_ops = {
2660         .start  = if6_seq_start,
2661         .next   = if6_seq_next,
2662         .show   = if6_seq_show,
2663         .stop   = if6_seq_stop,
2664 };
2665
2666 static int if6_seq_open(struct inode *inode, struct file *file)
2667 {
2668         struct seq_file *seq;
2669         int rc = -ENOMEM;
2670         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2671
2672         if (!s)
2673                 goto out;
2674
2675         rc = seq_open(file, &if6_seq_ops);
2676         if (rc)
2677                 goto out_kfree;
2678
2679         seq = file->private_data;
2680         seq->private = s;
2681 out:
2682         return rc;
2683 out_kfree:
2684         kfree(s);
2685         goto out;
2686 }
2687
2688 static struct file_operations if6_fops = {
2689         .owner          = THIS_MODULE,
2690         .open           = if6_seq_open,
2691         .read           = seq_read,
2692         .llseek         = seq_lseek,
2693         .release        = seq_release_private,
2694 };
2695
2696 int __init if6_proc_init(void)
2697 {
2698         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2699                 return -ENOMEM;
2700         return 0;
2701 }
2702
2703 void if6_proc_exit(void)
2704 {
2705         proc_net_remove("if_inet6");
2706 }
2707 #endif  /* CONFIG_PROC_FS */
2708
2709 /*
2710  *      Periodic address status verification
2711  */
2712
2713 static void addrconf_verify(unsigned long foo)
2714 {
2715         struct inet6_ifaddr *ifp;
2716         unsigned long now, next;
2717         int i;
2718
2719         spin_lock_bh(&addrconf_verify_lock);
2720         now = jiffies;
2721         next = now + ADDR_CHECK_FREQUENCY;
2722
2723         del_timer(&addr_chk_timer);
2724
2725         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2726
2727 restart:
2728                 read_lock(&addrconf_hash_lock);
2729                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2730                         unsigned long age;
2731 #ifdef CONFIG_IPV6_PRIVACY
2732                         unsigned long regen_advance;
2733 #endif
2734
2735                         if (ifp->flags & IFA_F_PERMANENT)
2736                                 continue;
2737
2738                         spin_lock(&ifp->lock);
2739                         age = (now - ifp->tstamp) / HZ;
2740
2741 #ifdef CONFIG_IPV6_PRIVACY
2742                         regen_advance = ifp->idev->cnf.regen_max_retry *
2743                                         ifp->idev->cnf.dad_transmits *
2744                                         ifp->idev->nd_parms->retrans_time / HZ;
2745 #endif
2746
2747                         if (age >= ifp->valid_lft) {
2748                                 spin_unlock(&ifp->lock);
2749                                 in6_ifa_hold(ifp);
2750                                 read_unlock(&addrconf_hash_lock);
2751                                 ipv6_del_addr(ifp);
2752                                 goto restart;
2753                         } else if (age >= ifp->prefered_lft) {
2754                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2755                                 int deprecate = 0;
2756
2757                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2758                                         deprecate = 1;
2759                                         ifp->flags |= IFA_F_DEPRECATED;
2760                                 }
2761
2762                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2763                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2764
2765                                 spin_unlock(&ifp->lock);
2766
2767                                 if (deprecate) {
2768                                         in6_ifa_hold(ifp);
2769                                         read_unlock(&addrconf_hash_lock);
2770
2771                                         ipv6_ifa_notify(0, ifp);
2772                                         in6_ifa_put(ifp);
2773                                         goto restart;
2774                                 }
2775 #ifdef CONFIG_IPV6_PRIVACY
2776                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2777                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2778                                 if (age >= ifp->prefered_lft - regen_advance) {
2779                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2780                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2781                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2782                                         if (!ifp->regen_count && ifpub) {
2783                                                 ifp->regen_count++;
2784                                                 in6_ifa_hold(ifp);
2785                                                 in6_ifa_hold(ifpub);
2786                                                 spin_unlock(&ifp->lock);
2787                                                 read_unlock(&addrconf_hash_lock);
2788                                                 spin_lock(&ifpub->lock);
2789                                                 ifpub->regen_count = 0;
2790                                                 spin_unlock(&ifpub->lock);
2791                                                 ipv6_create_tempaddr(ifpub, ifp);
2792                                                 in6_ifa_put(ifpub);
2793                                                 in6_ifa_put(ifp);
2794                                                 goto restart;
2795                                         }
2796                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2797                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2798                                 spin_unlock(&ifp->lock);
2799 #endif
2800                         } else {
2801                                 /* ifp->prefered_lft <= ifp->valid_lft */
2802                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2803                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2804                                 spin_unlock(&ifp->lock);
2805                         }
2806                 }
2807                 read_unlock(&addrconf_hash_lock);
2808         }
2809
2810         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2811         add_timer(&addr_chk_timer);
2812         spin_unlock_bh(&addrconf_verify_lock);
2813 }
2814
2815 static int
2816 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2817 {
2818         struct rtattr **rta = arg;
2819         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2820         struct in6_addr *pfx;
2821
2822         pfx = NULL;
2823         if (rta[IFA_ADDRESS-1]) {
2824                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2825                         return -EINVAL;
2826                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2827         }
2828         if (rta[IFA_LOCAL-1]) {
2829                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2830                         return -EINVAL;
2831                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2832         }
2833         if (pfx == NULL)
2834                 return -EINVAL;
2835
2836         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2837 }
2838
2839 static int
2840 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2841 {
2842         struct rtattr  **rta = arg;
2843         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2844         struct in6_addr *pfx;
2845
2846         pfx = NULL;
2847         if (rta[IFA_ADDRESS-1]) {
2848                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2849                         return -EINVAL;
2850                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2851         }
2852         if (rta[IFA_LOCAL-1]) {
2853                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2854                         return -EINVAL;
2855                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2856         }
2857         if (pfx == NULL)
2858                 return -EINVAL;
2859
2860         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2861 }
2862
2863 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2864                              u32 pid, u32 seq, int event, unsigned int flags)
2865 {
2866         struct ifaddrmsg *ifm;
2867         struct nlmsghdr  *nlh;
2868         struct ifa_cacheinfo ci;
2869         unsigned char    *b = skb->tail;
2870
2871         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2872         ifm = NLMSG_DATA(nlh);
2873         ifm->ifa_family = AF_INET6;
2874         ifm->ifa_prefixlen = ifa->prefix_len;
2875         ifm->ifa_flags = ifa->flags;
2876         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2877         if (ifa->scope&IFA_HOST)
2878                 ifm->ifa_scope = RT_SCOPE_HOST;
2879         else if (ifa->scope&IFA_LINK)
2880                 ifm->ifa_scope = RT_SCOPE_LINK;
2881         else if (ifa->scope&IFA_SITE)
2882                 ifm->ifa_scope = RT_SCOPE_SITE;
2883         ifm->ifa_index = ifa->idev->dev->ifindex;
2884         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2885         if (!(ifa->flags&IFA_F_PERMANENT)) {
2886                 ci.ifa_prefered = ifa->prefered_lft;
2887                 ci.ifa_valid = ifa->valid_lft;
2888                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2889                         long tval = (jiffies - ifa->tstamp)/HZ;
2890                         ci.ifa_prefered -= tval;
2891                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2892                                 ci.ifa_valid -= tval;
2893                 }
2894         } else {
2895                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2896                 ci.ifa_valid = INFINITY_LIFE_TIME;
2897         }
2898         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2899                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2900         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2901                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2902         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2903         nlh->nlmsg_len = skb->tail - b;
2904         return skb->len;
2905
2906 nlmsg_failure:
2907 rtattr_failure:
2908         skb_trim(skb, b - skb->data);
2909         return -1;
2910 }
2911
2912 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2913                                 u32 pid, u32 seq, int event, u16 flags)
2914 {
2915         struct ifaddrmsg *ifm;
2916         struct nlmsghdr  *nlh;
2917         struct ifa_cacheinfo ci;
2918         unsigned char    *b = skb->tail;
2919
2920         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2921         ifm = NLMSG_DATA(nlh);
2922         ifm->ifa_family = AF_INET6;
2923         ifm->ifa_prefixlen = 128;
2924         ifm->ifa_flags = IFA_F_PERMANENT;
2925         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2926         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2927                 ifm->ifa_scope = RT_SCOPE_SITE;
2928         ifm->ifa_index = ifmca->idev->dev->ifindex;
2929         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2930         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2931                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2932                     * 100 / HZ);
2933         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2934                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2935                     * 100 / HZ);
2936         ci.ifa_prefered = INFINITY_LIFE_TIME;
2937         ci.ifa_valid = INFINITY_LIFE_TIME;
2938         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2939         nlh->nlmsg_len = skb->tail - b;
2940         return skb->len;
2941
2942 nlmsg_failure:
2943 rtattr_failure:
2944         skb_trim(skb, b - skb->data);
2945         return -1;
2946 }
2947
2948 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2949                                 u32 pid, u32 seq, int event, unsigned int flags)
2950 {
2951         struct ifaddrmsg *ifm;
2952         struct nlmsghdr  *nlh;
2953         struct ifa_cacheinfo ci;
2954         unsigned char    *b = skb->tail;
2955
2956         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2957         ifm = NLMSG_DATA(nlh);
2958         ifm->ifa_family = AF_INET6;
2959         ifm->ifa_prefixlen = 128;
2960         ifm->ifa_flags = IFA_F_PERMANENT;
2961         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2962         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2963                 ifm->ifa_scope = RT_SCOPE_SITE;
2964         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2965         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2966         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2967                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2968                     * 100 / HZ);
2969         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2970                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2971                     * 100 / HZ);
2972         ci.ifa_prefered = INFINITY_LIFE_TIME;
2973         ci.ifa_valid = INFINITY_LIFE_TIME;
2974         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2975         nlh->nlmsg_len = skb->tail - b;
2976         return skb->len;
2977
2978 nlmsg_failure:
2979 rtattr_failure:
2980         skb_trim(skb, b - skb->data);
2981         return -1;
2982 }
2983
2984 enum addr_type_t
2985 {
2986         UNICAST_ADDR,
2987         MULTICAST_ADDR,
2988         ANYCAST_ADDR,
2989 };
2990
2991 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2992                            enum addr_type_t type)
2993 {
2994         int idx, ip_idx;
2995         int s_idx, s_ip_idx;
2996         int err = 1;
2997         struct net_device *dev;
2998         struct inet6_dev *idev = NULL;
2999         struct inet6_ifaddr *ifa;
3000         struct ifmcaddr6 *ifmca;
3001         struct ifacaddr6 *ifaca;
3002
3003         s_idx = cb->args[0];
3004         s_ip_idx = ip_idx = cb->args[1];
3005         read_lock(&dev_base_lock);
3006
3007         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3008                 if (idx < s_idx)
3009                         continue;
3010                 if (idx > s_idx)
3011                         s_ip_idx = 0;
3012                 ip_idx = 0;
3013                 if ((idev = in6_dev_get(dev)) == NULL)
3014                         continue;
3015                 read_lock_bh(&idev->lock);
3016                 switch (type) {
3017                 case UNICAST_ADDR:
3018                         /* unicast address incl. temp addr */
3019                         for (ifa = idev->addr_list; ifa;
3020                              ifa = ifa->if_next, ip_idx++) {
3021                                 if (ip_idx < s_ip_idx)
3022                                         continue;
3023                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3024                                     NETLINK_CB(cb->skb).pid,
3025                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3026                                     NLM_F_MULTI)) <= 0)
3027                                         goto done;
3028                         }
3029                         break;
3030                 case MULTICAST_ADDR:
3031                         /* multicast address */
3032                         for (ifmca = idev->mc_list; ifmca;
3033                              ifmca = ifmca->next, ip_idx++) {
3034                                 if (ip_idx < s_ip_idx)
3035                                         continue;
3036                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3037                                     NETLINK_CB(cb->skb).pid,
3038                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3039                                     NLM_F_MULTI)) <= 0)
3040                                         goto done;
3041                         }
3042                         break;
3043                 case ANYCAST_ADDR:
3044                         /* anycast address */
3045                         for (ifaca = idev->ac_list; ifaca;
3046                              ifaca = ifaca->aca_next, ip_idx++) {
3047                                 if (ip_idx < s_ip_idx)
3048                                         continue;
3049                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3050                                     NETLINK_CB(cb->skb).pid,
3051                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3052                                     NLM_F_MULTI)) <= 0)
3053                                         goto done;
3054                         }
3055                         break;
3056                 default:
3057                         break;
3058                 }
3059                 read_unlock_bh(&idev->lock);
3060                 in6_dev_put(idev);
3061         }
3062 done:
3063         if (err <= 0) {
3064                 read_unlock_bh(&idev->lock);
3065                 in6_dev_put(idev);
3066         }
3067         read_unlock(&dev_base_lock);
3068         cb->args[0] = idx;
3069         cb->args[1] = ip_idx;
3070         return skb->len;
3071 }
3072
3073 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3074 {
3075         enum addr_type_t type = UNICAST_ADDR;
3076         return inet6_dump_addr(skb, cb, type);
3077 }
3078
3079 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3080 {
3081         enum addr_type_t type = MULTICAST_ADDR;
3082         return inet6_dump_addr(skb, cb, type);
3083 }
3084
3085
3086 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3087 {
3088         enum addr_type_t type = ANYCAST_ADDR;
3089         return inet6_dump_addr(skb, cb, type);
3090 }
3091
3092 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3093 {
3094         struct sk_buff *skb;
3095         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3096
3097         skb = alloc_skb(size, GFP_ATOMIC);
3098         if (!skb) {
3099                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3100                 return;
3101         }
3102         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3103                 kfree_skb(skb);
3104                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3105                 return;
3106         }
3107         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3108         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3109 }
3110
3111 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3112                                 __s32 *array, int bytes)
3113 {
3114         memset(array, 0, bytes);
3115         array[DEVCONF_FORWARDING] = cnf->forwarding;
3116         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3117         array[DEVCONF_MTU6] = cnf->mtu6;
3118         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3119         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3120         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3121         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3122         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3123         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3124         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3125         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3126 #ifdef CONFIG_IPV6_PRIVACY
3127         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3128         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3129         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3130         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3131         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3132 #endif
3133         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3134         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3135         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3136 #ifdef CONFIG_IPV6_ROUTER_PREF
3137         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3138         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3139 #ifdef CONFIV_IPV6_ROUTE_INFO
3140         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3141 #endif
3142 #endif
3143 }
3144
3145 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3146                              u32 pid, u32 seq, int event, unsigned int flags)
3147 {
3148         struct net_device       *dev = idev->dev;
3149         __s32                   *array = NULL;
3150         struct ifinfomsg        *r;
3151         struct nlmsghdr         *nlh;
3152         unsigned char           *b = skb->tail;
3153         struct rtattr           *subattr;
3154         __u32                   mtu = dev->mtu;
3155         struct ifla_cacheinfo   ci;
3156
3157         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3158         r = NLMSG_DATA(nlh);
3159         r->ifi_family = AF_INET6;
3160         r->__ifi_pad = 0;
3161         r->ifi_type = dev->type;
3162         r->ifi_index = dev->ifindex;
3163         r->ifi_flags = dev_get_flags(dev);
3164         r->ifi_change = 0;
3165
3166         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3167
3168         if (dev->addr_len)
3169                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3170
3171         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3172         if (dev->ifindex != dev->iflink)
3173                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3174
3175         subattr = (struct rtattr*)skb->tail;
3176
3177         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3178
3179         /* return the device flags */
3180         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3181
3182         /* return interface cacheinfo */
3183         ci.max_reasm_len = IPV6_MAXPLEN;
3184         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3185                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3186         ci.reachable_time = idev->nd_parms->reachable_time;
3187         ci.retrans_time = idev->nd_parms->retrans_time;
3188         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3189
3190         /* return the device sysctl params */
3191         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3192                 goto rtattr_failure;
3193         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3194         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3195
3196         /* XXX - Statistics/MC not implemented */
3197         subattr->rta_len = skb->tail - (u8*)subattr;
3198
3199         nlh->nlmsg_len = skb->tail - b;
3200         kfree(array);
3201         return skb->len;
3202
3203 nlmsg_failure:
3204 rtattr_failure:
3205         kfree(array);
3206         skb_trim(skb, b - skb->data);
3207         return -1;
3208 }
3209
3210 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3211 {
3212         int idx, err;
3213         int s_idx = cb->args[0];
3214         struct net_device *dev;
3215         struct inet6_dev *idev;
3216
3217         read_lock(&dev_base_lock);
3218         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3219                 if (idx < s_idx)
3220                         continue;
3221                 if ((idev = in6_dev_get(dev)) == NULL)
3222                         continue;
3223                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3224                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3225                 in6_dev_put(idev);
3226                 if (err <= 0)
3227                         break;
3228         }
3229         read_unlock(&dev_base_lock);
3230         cb->args[0] = idx;
3231
3232         return skb->len;
3233 }
3234
3235 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3236 {
3237         struct sk_buff *skb;
3238         /* 128 bytes ?? */
3239         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3240
3241         skb = alloc_skb(size, GFP_ATOMIC);
3242         if (!skb) {
3243                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3244                 return;
3245         }
3246         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3247                 kfree_skb(skb);
3248                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3249                 return;
3250         }
3251         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3252         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3253 }
3254
3255 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3256                         struct prefix_info *pinfo, u32 pid, u32 seq,
3257                         int event, unsigned int flags)
3258 {
3259         struct prefixmsg        *pmsg;
3260         struct nlmsghdr         *nlh;
3261         unsigned char           *b = skb->tail;
3262         struct prefix_cacheinfo ci;
3263
3264         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3265         pmsg = NLMSG_DATA(nlh);
3266         pmsg->prefix_family = AF_INET6;
3267         pmsg->prefix_pad1 = 0;
3268         pmsg->prefix_pad2 = 0;
3269         pmsg->prefix_ifindex = idev->dev->ifindex;
3270         pmsg->prefix_len = pinfo->prefix_len;
3271         pmsg->prefix_type = pinfo->type;
3272         pmsg->prefix_pad3 = 0;
3273
3274         pmsg->prefix_flags = 0;
3275         if (pinfo->onlink)
3276                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3277         if (pinfo->autoconf)
3278                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3279
3280         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3281
3282         ci.preferred_time = ntohl(pinfo->prefered);
3283         ci.valid_time = ntohl(pinfo->valid);
3284         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3285
3286         nlh->nlmsg_len = skb->tail - b;
3287         return skb->len;
3288
3289 nlmsg_failure:
3290 rtattr_failure:
3291         skb_trim(skb, b - skb->data);
3292         return -1;
3293 }
3294
3295 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3296                          struct prefix_info *pinfo)
3297 {
3298         struct sk_buff *skb;
3299         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3300
3301         skb = alloc_skb(size, GFP_ATOMIC);
3302         if (!skb) {
3303                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3304                 return;
3305         }
3306         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3307                 kfree_skb(skb);
3308                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3309                 return;
3310         }
3311         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3312         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3313 }
3314
3315 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3316         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3317         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3318         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3319         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3320         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3321         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3322         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3323         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3324         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3325                                       .dumpit   = inet6_dump_fib, },
3326 };
3327
3328 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3329 {
3330         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3331
3332         switch (event) {
3333         case RTM_NEWADDR:
3334                 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3335                 if (ifp->idev->cnf.forwarding)
3336                         addrconf_join_anycast(ifp);
3337                 break;
3338         case RTM_DELADDR:
3339                 if (ifp->idev->cnf.forwarding)
3340                         addrconf_leave_anycast(ifp);
3341                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3342                 dst_hold(&ifp->rt->u.dst);
3343                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3344                         dst_free(&ifp->rt->u.dst);
3345                 break;
3346         }
3347 }
3348
3349 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3350 {
3351         read_lock_bh(&addrconf_lock);
3352         if (likely(ifp->idev->dead == 0))
3353                 __ipv6_ifa_notify(event, ifp);
3354         read_unlock_bh(&addrconf_lock);
3355 }
3356
3357 #ifdef CONFIG_SYSCTL
3358
3359 static
3360 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3361                            void __user *buffer, size_t *lenp, loff_t *ppos)
3362 {
3363         int *valp = ctl->data;
3364         int val = *valp;
3365         int ret;
3366
3367         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3368
3369         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3370                 if (valp != &ipv6_devconf.forwarding) {
3371                         if ((!*valp) ^ (!val)) {
3372                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3373                                 if (idev == NULL)
3374                                         return ret;
3375                                 dev_forward_change(idev);
3376                         }
3377                 } else {
3378                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3379                         addrconf_forward_change();
3380                 }
3381                 if (*valp)
3382                         rt6_purge_dflt_routers();
3383         }
3384
3385         return ret;
3386 }
3387
3388 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3389                                             int __user *name, int nlen,
3390                                             void __user *oldval,
3391                                             size_t __user *oldlenp,
3392                                             void __user *newval, size_t newlen,
3393                                             void **context)
3394 {
3395         int *valp = table->data;
3396         int new;
3397
3398         if (!newval || !newlen)
3399                 return 0;
3400         if (newlen != sizeof(int))
3401                 return -EINVAL;
3402         if (get_user(new, (int __user *)newval))
3403                 return -EFAULT;
3404         if (new == *valp)
3405                 return 0;
3406         if (oldval && oldlenp) {
3407                 size_t len;
3408                 if (get_user(len, oldlenp))
3409                         return -EFAULT;
3410                 if (len) {
3411                         if (len > table->maxlen)
3412                                 len = table->maxlen;
3413                         if (copy_to_user(oldval, valp, len))
3414                                 return -EFAULT;
3415                         if (put_user(len, oldlenp))
3416                                 return -EFAULT;
3417                 }
3418         }
3419
3420         if (valp != &ipv6_devconf_dflt.forwarding) {
3421                 if (valp != &ipv6_devconf.forwarding) {
3422                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3423                         int changed;
3424                         if (unlikely(idev == NULL))
3425                                 return -ENODEV;
3426                         changed = (!*valp) ^ (!new);
3427                         *valp = new;
3428                         if (changed)
3429                                 dev_forward_change(idev);
3430                 } else {
3431                         *valp = new;
3432                         addrconf_forward_change();
3433                 }
3434
3435                 if (*valp)
3436                         rt6_purge_dflt_routers();
3437         } else
3438                 *valp = new;
3439
3440         return 1;
3441 }
3442
3443 static struct addrconf_sysctl_table
3444 {
3445         struct ctl_table_header *sysctl_header;
3446         ctl_table addrconf_vars[__NET_IPV6_MAX];
3447         ctl_table addrconf_dev[2];
3448         ctl_table addrconf_conf_dir[2];
3449         ctl_table addrconf_proto_dir[2];
3450         ctl_table addrconf_root_dir[2];
3451 } addrconf_sysctl = {
3452         .sysctl_header = NULL,
3453         .addrconf_vars = {
3454                 {
3455                         .ctl_name       =       NET_IPV6_FORWARDING,
3456                         .procname       =       "forwarding",
3457                         .data           =       &ipv6_devconf.forwarding,
3458                         .maxlen         =       sizeof(int),
3459                         .mode           =       0644,
3460                         .proc_handler   =       &addrconf_sysctl_forward,
3461                         .strategy       =       &addrconf_sysctl_forward_strategy,
3462                 },
3463                 {
3464                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3465                         .procname       =       "hop_limit",
3466                         .data           =       &ipv6_devconf.hop_limit,
3467                         .maxlen         =       sizeof(int),
3468                         .mode           =       0644,
3469                         .proc_handler   =       proc_dointvec,
3470                 },
3471                 {
3472                         .ctl_name       =       NET_IPV6_MTU,
3473                         .procname       =       "mtu",
3474                         .data           =       &ipv6_devconf.mtu6,
3475                         .maxlen         =       sizeof(int),
3476                         .mode           =       0644,
3477                         .proc_handler   =       &proc_dointvec,
3478                 },
3479                 {
3480                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3481                         .procname       =       "accept_ra",
3482                         .data           =       &ipv6_devconf.accept_ra,
3483                         .maxlen         =       sizeof(int),
3484                         .mode           =       0644,
3485                         .proc_handler   =       &proc_dointvec,
3486                 },
3487                 {
3488                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3489                         .procname       =       "accept_redirects",
3490                         .data           =       &ipv6_devconf.accept_redirects,
3491                         .maxlen         =       sizeof(int),
3492                         .mode           =       0644,
3493                         .proc_handler   =       &proc_dointvec,
3494                 },
3495                 {
3496                         .ctl_name       =       NET_IPV6_AUTOCONF,
3497                         .procname       =       "autoconf",
3498                         .data           =       &ipv6_devconf.autoconf,
3499                         .maxlen         =       sizeof(int),
3500                         .mode           =       0644,
3501                         .proc_handler   =       &proc_dointvec,
3502                 },
3503                 {
3504                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3505                         .procname       =       "dad_transmits",
3506                         .data           =       &ipv6_devconf.dad_transmits,
3507                         .maxlen         =       sizeof(int),
3508                         .mode           =       0644,
3509                         .proc_handler   =       &proc_dointvec,
3510                 },
3511                 {
3512                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3513                         .procname       =       "router_solicitations",
3514                         .data           =       &ipv6_devconf.rtr_solicits,
3515                         .maxlen         =       sizeof(int),
3516                         .mode           =       0644,
3517                         .proc_handler   =       &proc_dointvec,
3518                 },
3519                 {
3520                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3521                         .procname       =       "router_solicitation_interval",
3522                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3523                         .maxlen         =       sizeof(int),
3524                         .mode           =       0644,
3525                         .proc_handler   =       &proc_dointvec_jiffies,
3526                         .strategy       =       &sysctl_jiffies,
3527                 },
3528                 {
3529                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3530                         .procname       =       "router_solicitation_delay",
3531                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3532                         .maxlen         =       sizeof(int),
3533                         .mode           =       0644,
3534                         .proc_handler   =       &proc_dointvec_jiffies,
3535                         .strategy       =       &sysctl_jiffies,
3536                 },
3537                 {
3538                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3539                         .procname       =       "force_mld_version",
3540                         .data           =       &ipv6_devconf.force_mld_version,
3541                         .maxlen         =       sizeof(int),
3542                         .mode           =       0644,
3543                         .proc_handler   =       &proc_dointvec,
3544                 },
3545 #ifdef CONFIG_IPV6_PRIVACY
3546                 {
3547                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3548                         .procname       =       "use_tempaddr",
3549                         .data           =       &ipv6_devconf.use_tempaddr,
3550                         .maxlen         =       sizeof(int),
3551                         .mode           =       0644,
3552                         .proc_handler   =       &proc_dointvec,
3553                 },
3554                 {
3555                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3556                         .procname       =       "temp_valid_lft",
3557                         .data           =       &ipv6_devconf.temp_valid_lft,
3558                         .maxlen         =       sizeof(int),
3559                         .mode           =       0644,
3560                         .proc_handler   =       &proc_dointvec,
3561                 },
3562                 {
3563                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3564                         .procname       =       "temp_prefered_lft",
3565                         .data           =       &ipv6_devconf.temp_prefered_lft,
3566                         .maxlen         =       sizeof(int),
3567                         .mode           =       0644,
3568                         .proc_handler   =       &proc_dointvec,
3569                 },
3570                 {
3571                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3572                         .procname       =       "regen_max_retry",
3573                         .data           =       &ipv6_devconf.regen_max_retry,
3574                         .maxlen         =       sizeof(int),
3575                         .mode           =       0644,
3576                         .proc_handler   =       &proc_dointvec,
3577                 },
3578                 {
3579                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3580                         .procname       =       "max_desync_factor",
3581                         .data           =       &ipv6_devconf.max_desync_factor,
3582                         .maxlen         =       sizeof(int),
3583                         .mode           =       0644,
3584                         .proc_handler   =       &proc_dointvec,
3585                 },
3586 #endif
3587                 {
3588                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3589                         .procname       =       "max_addresses",
3590                         .data           =       &ipv6_devconf.max_addresses,
3591                         .maxlen         =       sizeof(int),
3592                         .mode           =       0644,
3593                         .proc_handler   =       &proc_dointvec,
3594                 },
3595                 {
3596                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3597                         .procname       =       "accept_ra_defrtr",
3598                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3599                         .maxlen         =       sizeof(int),
3600                         .mode           =       0644,
3601                         .proc_handler   =       &proc_dointvec,
3602                 },
3603                 {
3604                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3605                         .procname       =       "accept_ra_pinfo",
3606                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3607                         .maxlen         =       sizeof(int),
3608                         .mode           =       0644,
3609                         .proc_handler   =       &proc_dointvec,
3610                 },
3611 #ifdef CONFIG_IPV6_ROUTER_PREF
3612                 {
3613                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3614                         .procname       =       "accept_ra_rtr_pref",
3615                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3616                         .maxlen         =       sizeof(int),
3617                         .mode           =       0644,
3618                         .proc_handler   =       &proc_dointvec,
3619                 },
3620                 {
3621                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3622                         .procname       =       "router_probe_interval",
3623                         .data           =       &ipv6_devconf.rtr_probe_interval,
3624                         .maxlen         =       sizeof(int),
3625                         .mode           =       0644,
3626                         .proc_handler   =       &proc_dointvec_jiffies,
3627                         .strategy       =       &sysctl_jiffies,
3628                 },
3629 #ifdef CONFIV_IPV6_ROUTE_INFO
3630                 {
3631                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3632                         .procname       =       "accept_ra_rt_info_max_plen",
3633                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3634                         .maxlen         =       sizeof(int),
3635                         .mode           =       0644,
3636                         .proc_handler   =       &proc_dointvec,
3637                 },
3638 #endif
3639 #endif
3640                 {
3641                         .ctl_name       =       0,      /* sentinel */
3642                 }
3643         },
3644         .addrconf_dev = {
3645                 {
3646                         .ctl_name       =       NET_PROTO_CONF_ALL,
3647                         .procname       =       "all",
3648                         .mode           =       0555,
3649                         .child          =       addrconf_sysctl.addrconf_vars,
3650                 },
3651                 {
3652                         .ctl_name       =       0,      /* sentinel */
3653                 }
3654         },
3655         .addrconf_conf_dir = {
3656                 {
3657                         .ctl_name       =       NET_IPV6_CONF,
3658                         .procname       =       "conf",
3659                         .mode           =       0555,
3660                         .child          =       addrconf_sysctl.addrconf_dev,
3661                 },
3662                 {
3663                         .ctl_name       =       0,      /* sentinel */
3664                 }
3665         },
3666         .addrconf_proto_dir = {
3667                 {
3668                         .ctl_name       =       NET_IPV6,
3669                         .procname       =       "ipv6",
3670                         .mode           =       0555,
3671                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3672                 },
3673                 {
3674                         .ctl_name       =       0,      /* sentinel */
3675                 }
3676         },
3677         .addrconf_root_dir = {
3678                 {
3679                         .ctl_name       =       CTL_NET,
3680                         .procname       =       "net",
3681                         .mode           =       0555,
3682                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3683                 },
3684                 {
3685                         .ctl_name       =       0,      /* sentinel */
3686                 }
3687         },
3688 };
3689
3690 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3691 {
3692         int i;
3693         struct net_device *dev = idev ? idev->dev : NULL;
3694         struct addrconf_sysctl_table *t;
3695         char *dev_name = NULL;
3696
3697         t = kmalloc(sizeof(*t), GFP_KERNEL);
3698         if (t == NULL)
3699                 return;
3700         memcpy(t, &addrconf_sysctl, sizeof(*t));
3701         for (i=0; t->addrconf_vars[i].data; i++) {
3702                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3703                 t->addrconf_vars[i].de = NULL;
3704                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3705         }
3706         if (dev) {
3707                 dev_name = dev->name;
3708                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3709         } else {
3710                 dev_name = "default";
3711                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3712         }
3713
3714         /*
3715          * Make a copy of dev_name, because '.procname' is regarded as const
3716          * by sysctl and we wouldn't want anyone to change it under our feet
3717          * (see SIOCSIFNAME).
3718          */
3719         dev_name = kstrdup(dev_name, GFP_KERNEL);
3720         if (!dev_name)
3721             goto free;
3722
3723         t->addrconf_dev[0].procname = dev_name;
3724
3725         t->addrconf_dev[0].child = t->addrconf_vars;
3726         t->addrconf_dev[0].de = NULL;
3727         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3728         t->addrconf_conf_dir[0].de = NULL;
3729         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3730         t->addrconf_proto_dir[0].de = NULL;
3731         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3732         t->addrconf_root_dir[0].de = NULL;
3733
3734         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3735         if (t->sysctl_header == NULL)
3736                 goto free_procname;
3737         else
3738                 p->sysctl = t;
3739         return;
3740
3741         /* error path */
3742  free_procname:
3743         kfree(dev_name);
3744  free:
3745         kfree(t);
3746
3747         return;
3748 }
3749
3750 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3751 {
3752         if (p->sysctl) {
3753                 struct addrconf_sysctl_table *t = p->sysctl;
3754                 p->sysctl = NULL;
3755                 unregister_sysctl_table(t->sysctl_header);
3756                 kfree(t->addrconf_dev[0].procname);
3757                 kfree(t);
3758         }
3759 }
3760
3761
3762 #endif
3763
3764 /*
3765  *      Device notifier
3766  */
3767
3768 int register_inet6addr_notifier(struct notifier_block *nb)
3769 {
3770         return notifier_chain_register(&inet6addr_chain, nb);
3771 }
3772
3773 int unregister_inet6addr_notifier(struct notifier_block *nb)
3774 {
3775         return notifier_chain_unregister(&inet6addr_chain,nb);
3776 }
3777
3778 /*
3779  *      Init / cleanup code
3780  */
3781
3782 int __init addrconf_init(void)
3783 {
3784         int err = 0;
3785
3786         /* The addrconf netdev notifier requires that loopback_dev
3787          * has it's ipv6 private information allocated and setup
3788          * before it can bring up and give link-local addresses
3789          * to other devices which are up.
3790          *
3791          * Unfortunately, loopback_dev is not necessarily the first
3792          * entry in the global dev_base list of net devices.  In fact,
3793          * it is likely to be the very last entry on that list.
3794          * So this causes the notifier registry below to try and
3795          * give link-local addresses to all devices besides loopback_dev
3796          * first, then loopback_dev, which cases all the non-loopback_dev
3797          * devices to fail to get a link-local address.
3798          *
3799          * So, as a temporary fix, allocate the ipv6 structure for
3800          * loopback_dev first by hand.
3801          * Longer term, all of the dependencies ipv6 has upon the loopback
3802          * device and it being up should be removed.
3803          */
3804         rtnl_lock();
3805         if (!ipv6_add_dev(&loopback_dev))
3806                 err = -ENOMEM;
3807         rtnl_unlock();
3808         if (err)
3809                 return err;
3810
3811         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3812
3813         register_netdevice_notifier(&ipv6_dev_notf);
3814
3815         addrconf_verify(0);
3816         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3817 #ifdef CONFIG_SYSCTL
3818         addrconf_sysctl.sysctl_header =
3819                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3820         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3821 #endif
3822
3823         return 0;
3824 }
3825
3826 void __exit addrconf_cleanup(void)
3827 {
3828         struct net_device *dev;
3829         struct inet6_dev *idev;
3830         struct inet6_ifaddr *ifa;
3831         int i;
3832
3833         unregister_netdevice_notifier(&ipv6_dev_notf);
3834
3835         rtnetlink_links[PF_INET6] = NULL;
3836 #ifdef CONFIG_SYSCTL
3837         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3838         addrconf_sysctl_unregister(&ipv6_devconf);
3839 #endif
3840
3841         rtnl_lock();
3842
3843         /*
3844          *      clean dev list.
3845          */
3846
3847         for (dev=dev_base; dev; dev=dev->next) {
3848                 if ((idev = __in6_dev_get(dev)) == NULL)
3849                         continue;
3850                 addrconf_ifdown(dev, 1);
3851         }
3852         addrconf_ifdown(&loopback_dev, 2);
3853
3854         /*
3855          *      Check hash table.
3856          */
3857
3858         write_lock_bh(&addrconf_hash_lock);
3859         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3860                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3861                         struct inet6_ifaddr *bifa;
3862
3863                         bifa = ifa;
3864                         ifa = ifa->lst_next;
3865                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3866                         /* Do not free it; something is wrong.
3867                            Now we can investigate it with debugger.
3868                          */
3869                 }
3870         }
3871         write_unlock_bh(&addrconf_hash_lock);
3872
3873         del_timer(&addr_chk_timer);
3874
3875         rtnl_unlock();
3876
3877 #ifdef CONFIG_PROC_FS
3878         proc_net_remove("if_inet6");
3879 #endif
3880 }