net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/sched.h>
  48 #include <linux/net.h>
  49 #include <linux/in6.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/if_addr.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 <net/netlink.h>
  77 #include <linux/if_tunnel.h>
  78 #include <linux/rtnetlink.h>
  79
  80 #ifdef CONFIG_IPV6_PRIVACY
  81 #include <linux/random.h>
  82 #endif
  83
  84 #include <asm/uaccess.h>
  85
  86 #include <linux/proc_fs.h>
  87 #include <linux/seq_file.h>
  88
  89 /* Set to 3 to get tracing... */
  90 #define ACONF_DEBUG 2
  91
  92 #if ACONF_DEBUG >= 3
  93 #define ADBG(x) printk x
  94 #else
  95 #define ADBG(x)
  96 #endif
  97
  98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 100
 101 #ifdef CONFIG_SYSCTL
 102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 104 #endif
 105
 106 #ifdef CONFIG_IPV6_PRIVACY
 107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 109 static void ipv6_regen_rndid(unsigned long data);
 110
 111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 112 #endif
 113
 114 static int ipv6_count_addresses(struct inet6_dev *idev);
 115
 116 /*
 117  *      Configured unicast address hash table
 118  */
 119 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 120 static DEFINE_RWLOCK(addrconf_hash_lock);
 121
 122 static void addrconf_verify(unsigned long);
 123
 124 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 125 static DEFINE_SPINLOCK(addrconf_verify_lock);
 126
 127 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 129
 130 static int addrconf_ifdown(struct net_device *dev, int how);
 131
 132 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 133 static void addrconf_dad_timer(unsigned long data);
 134 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 135 static void addrconf_dad_run(struct inet6_dev *idev);
 136 static void addrconf_rs_timer(unsigned long data);
 137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 139
 140 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 141                                 struct prefix_info *pinfo);
 142 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 143
 144 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 145
 146 struct ipv6_devconf ipv6_devconf __read_mostly = {
 147         .forwarding             = 0,
 148         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 149         .mtu6                   = IPV6_MIN_MTU,
 150         .accept_ra              = 1,
 151         .accept_redirects       = 1,
 152         .autoconf               = 1,
 153         .force_mld_version      = 0,
 154         .dad_transmits          = 1,
 155         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 156         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 157         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 158 #ifdef CONFIG_IPV6_PRIVACY
 159         .use_tempaddr           = 0,
 160         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 161         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 162         .regen_max_retry        = REGEN_MAX_RETRY,
 163         .max_desync_factor      = MAX_DESYNC_FACTOR,
 164 #endif
 165         .max_addresses          = IPV6_MAX_ADDRESSES,
 166         .accept_ra_defrtr       = 1,
 167         .accept_ra_pinfo        = 1,
 168 #ifdef CONFIG_IPV6_ROUTER_PREF
 169         .accept_ra_rtr_pref     = 1,
 170         .rtr_probe_interval     = 60 * HZ,
 171 #ifdef CONFIG_IPV6_ROUTE_INFO
 172         .accept_ra_rt_info_max_plen = 0,
 173 #endif
 174 #endif
 175         .proxy_ndp              = 0,
 176         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 177 };
 178
 179 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 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         .proxy_ndp              = 0,
 208         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 209 };
 210
 211 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 212 #if 0
 213 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 214 #endif
 215 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 216
 217 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 218
 219 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 220 {
 221         switch(scope) {
 222         case IPV6_ADDR_SCOPE_NODELOCAL:
 223                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 224                         IPV6_ADDR_LOOPBACK);
 225         case IPV6_ADDR_SCOPE_LINKLOCAL:
 226                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 227                         IPV6_ADDR_LINKLOCAL);
 228         case IPV6_ADDR_SCOPE_SITELOCAL:
 229                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 230                         IPV6_ADDR_SITELOCAL);
 231         }
 232         return IPV6_ADDR_SCOPE_TYPE(scope);
 233 }
 234
 235 int __ipv6_addr_type(const struct in6_addr *addr)
 236 {
 237         __be32 st;
 238
 239         st = addr->s6_addr32[0];
 240
 241         /* Consider all addresses with the first three bits different of
 242            000 and 111 as unicasts.
 243          */
 244         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 245             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 246                 return (IPV6_ADDR_UNICAST |
 247                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 248
 249         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 250                 /* multicast */
 251                 /* addr-select 3.1 */
 252                 return (IPV6_ADDR_MULTICAST |
 253                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 254         }
 255
 256         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 257                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 258                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 259         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 260                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 261                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 262
 263         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 264                 if (addr->s6_addr32[2] == 0) {
 265                         if (addr->s6_addr32[3] == 0)
 266                                 return IPV6_ADDR_ANY;
 267
 268                         if (addr->s6_addr32[3] == htonl(0x00000001))
 269                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 270                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 271
 272                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 273                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 274                 }
 275
 276                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 277                         return (IPV6_ADDR_MAPPED |
 278                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 279         }
 280
 281         return (IPV6_ADDR_RESERVED |
 282                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 283 }
 284
 285 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 286 {
 287         if (del_timer(&ifp->timer))
 288                 __in6_ifa_put(ifp);
 289 }
 290
 291 enum addrconf_timer_t
 292 {
 293         AC_NONE,
 294         AC_DAD,
 295         AC_RS,
 296 };
 297
 298 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 299                                enum addrconf_timer_t what,
 300                                unsigned long when)
 301 {
 302         if (!del_timer(&ifp->timer))
 303                 in6_ifa_hold(ifp);
 304
 305         switch (what) {
 306         case AC_DAD:
 307                 ifp->timer.function = addrconf_dad_timer;
 308                 break;
 309         case AC_RS:
 310                 ifp->timer.function = addrconf_rs_timer;
 311                 break;
 312         default:;
 313         }
 314         ifp->timer.expires = jiffies + when;
 315         add_timer(&ifp->timer);
 316 }
 317
 318 /* Nobody refers to this device, we may destroy it. */
 319
 320 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 321 {
 322         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 323         kfree(idev);
 324 }
 325
 326 void in6_dev_finish_destroy(struct inet6_dev *idev)
 327 {
 328         struct net_device *dev = idev->dev;
 329         BUG_TRAP(idev->addr_list==NULL);
 330         BUG_TRAP(idev->mc_list==NULL);
 331 #ifdef NET_REFCNT_DEBUG
 332         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 333 #endif
 334         dev_put(dev);
 335         if (!idev->dead) {
 336                 printk("Freeing alive inet6 device %p\n", idev);
 337                 return;
 338         }
 339         snmp6_free_dev(idev);
 340         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 341 }
 342
 343 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 344 {
 345         struct inet6_dev *ndev;
 346         struct in6_addr maddr;
 347
 348         ASSERT_RTNL();
 349
 350         if (dev->mtu < IPV6_MIN_MTU)
 351                 return NULL;
 352
 353         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 354
 355         if (ndev == NULL)
 356                 return NULL;
 357
 358         rwlock_init(&ndev->lock);
 359         ndev->dev = dev;
 360         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 361         ndev->cnf.mtu6 = dev->mtu;
 362         ndev->cnf.sysctl = NULL;
 363         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 364         if (ndev->nd_parms == NULL) {
 365                 kfree(ndev);
 366                 return NULL;
 367         }
 368         /* We refer to the device */
 369         dev_hold(dev);
 370
 371         if (snmp6_alloc_dev(ndev) < 0) {
 372                 ADBG((KERN_WARNING
 373                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 374                         __FUNCTION__, dev->name));
 375                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 376                 ndev->dead = 1;
 377                 in6_dev_finish_destroy(ndev);
 378                 return NULL;
 379         }
 380
 381         if (snmp6_register_dev(ndev) < 0) {
 382                 ADBG((KERN_WARNING
 383                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 384                         __FUNCTION__, dev->name));
 385                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 386                 ndev->dead = 1;
 387                 in6_dev_finish_destroy(ndev);
 388                 return NULL;
 389         }
 390
 391         /* One reference from device.  We must do this before
 392          * we invoke __ipv6_regen_rndid().
 393          */
 394         in6_dev_hold(ndev);
 395
 396 #ifdef CONFIG_IPV6_PRIVACY
 397         init_timer(&ndev->regen_timer);
 398         ndev->regen_timer.function = ipv6_regen_rndid;
 399         ndev->regen_timer.data = (unsigned long) ndev;
 400         if ((dev->flags&IFF_LOOPBACK) ||
 401             dev->type == ARPHRD_TUNNEL ||
 402 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 403             dev->type == ARPHRD_SIT ||
 404 #endif
 405             dev->type == ARPHRD_NONE) {
 406                 printk(KERN_INFO
 407                        "%s: Disabled Privacy Extensions\n",
 408                        dev->name);
 409                 ndev->cnf.use_tempaddr = -1;
 410         } else {
 411                 in6_dev_hold(ndev);
 412                 ipv6_regen_rndid((unsigned long) ndev);
 413         }
 414 #endif
 415
 416         if (netif_carrier_ok(dev))
 417                 ndev->if_flags |= IF_READY;
 418
 419
 420         ipv6_mc_init_dev(ndev);
 421         ndev->tstamp = jiffies;
 422 #ifdef CONFIG_SYSCTL
 423         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 424                               NET_IPV6_NEIGH, "ipv6",
 425                               &ndisc_ifinfo_sysctl_change,
 426                               NULL);
 427         addrconf_sysctl_register(ndev, &ndev->cnf);
 428 #endif
 429         /* protected by rtnl_lock */
 430         rcu_assign_pointer(dev->ip6_ptr, ndev);
 431
 432         /* Join all-node multicast group */
 433         ipv6_addr_all_nodes(&maddr);
 434         ipv6_dev_mc_inc(dev, &maddr);
 435
 436         return ndev;
 437 }
 438
 439 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 440 {
 441         struct inet6_dev *idev;
 442
 443         ASSERT_RTNL();
 444
 445         if ((idev = __in6_dev_get(dev)) == NULL) {
 446                 if ((idev = ipv6_add_dev(dev)) == NULL)
 447                         return NULL;
 448         }
 449
 450         if (dev->flags&IFF_UP)
 451                 ipv6_mc_up(idev);
 452         return idev;
 453 }
 454
 455 #ifdef CONFIG_SYSCTL
 456 static void dev_forward_change(struct inet6_dev *idev)
 457 {
 458         struct net_device *dev;
 459         struct inet6_ifaddr *ifa;
 460         struct in6_addr addr;
 461
 462         if (!idev)
 463                 return;
 464         dev = idev->dev;
 465         if (dev && (dev->flags & IFF_MULTICAST)) {
 466                 ipv6_addr_all_routers(&addr);
 467
 468                 if (idev->cnf.forwarding)
 469                         ipv6_dev_mc_inc(dev, &addr);
 470                 else
 471                         ipv6_dev_mc_dec(dev, &addr);
 472         }
 473         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 474                 if (ifa->flags&IFA_F_TENTATIVE)
 475                         continue;
 476                 if (idev->cnf.forwarding)
 477                         addrconf_join_anycast(ifa);
 478                 else
 479                         addrconf_leave_anycast(ifa);
 480         }
 481 }
 482
 483
 484 static void addrconf_forward_change(void)
 485 {
 486         struct net_device *dev;
 487         struct inet6_dev *idev;
 488
 489         read_lock(&dev_base_lock);
 490         for (dev=dev_base; dev; dev=dev->next) {
 491                 rcu_read_lock();
 492                 idev = __in6_dev_get(dev);
 493                 if (idev) {
 494                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 495                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 496                         if (changed)
 497                                 dev_forward_change(idev);
 498                 }
 499                 rcu_read_unlock();
 500         }
 501         read_unlock(&dev_base_lock);
 502 }
 503 #endif
 504
 505 /* Nobody refers to this ifaddr, destroy it */
 506
 507 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 508 {
 509         BUG_TRAP(ifp->if_next==NULL);
 510         BUG_TRAP(ifp->lst_next==NULL);
 511 #ifdef NET_REFCNT_DEBUG
 512         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 513 #endif
 514
 515         in6_dev_put(ifp->idev);
 516
 517         if (del_timer(&ifp->timer))
 518                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 519
 520         if (!ifp->dead) {
 521                 printk("Freeing alive inet6 address %p\n", ifp);
 522                 return;
 523         }
 524         dst_release(&ifp->rt->u.dst);
 525
 526         kfree(ifp);
 527 }
 528
 529 static void
 530 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 531 {
 532         struct inet6_ifaddr *ifa, **ifap;
 533         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 534
 535         /*
 536          * Each device address list is sorted in order of scope -
 537          * global before linklocal.
 538          */
 539         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 540              ifap = &ifa->if_next) {
 541                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 542                         break;
 543         }
 544
 545         ifp->if_next = *ifap;
 546         *ifap = ifp;
 547 }
 548
 549 /* On success it returns ifp with increased reference count */
 550
 551 static struct inet6_ifaddr *
 552 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 553               int scope, u32 flags)
 554 {
 555         struct inet6_ifaddr *ifa = NULL;
 556         struct rt6_info *rt;
 557         int hash;
 558         int err = 0;
 559
 560         rcu_read_lock_bh();
 561         if (idev->dead) {
 562                 err = -ENODEV;                  /*XXX*/
 563                 goto out2;
 564         }
 565
 566         write_lock(&addrconf_hash_lock);
 567
 568         /* Ignore adding duplicate addresses on an interface */
 569         if (ipv6_chk_same_addr(addr, idev->dev)) {
 570                 ADBG(("ipv6_add_addr: already assigned\n"));
 571                 err = -EEXIST;
 572                 goto out;
 573         }
 574
 575         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 576
 577         if (ifa == NULL) {
 578                 ADBG(("ipv6_add_addr: malloc failed\n"));
 579                 err = -ENOBUFS;
 580                 goto out;
 581         }
 582
 583         rt = addrconf_dst_alloc(idev, addr, 0);
 584         if (IS_ERR(rt)) {
 585                 err = PTR_ERR(rt);
 586                 goto out;
 587         }
 588
 589         ipv6_addr_copy(&ifa->addr, addr);
 590
 591         spin_lock_init(&ifa->lock);
 592         init_timer(&ifa->timer);
 593         ifa->timer.data = (unsigned long) ifa;
 594         ifa->scope = scope;
 595         ifa->prefix_len = pfxlen;
 596         ifa->flags = flags | IFA_F_TENTATIVE;
 597         ifa->cstamp = ifa->tstamp = jiffies;
 598
 599         ifa->rt = rt;
 600
 601         ifa->idev = idev;
 602         in6_dev_hold(idev);
 603         /* For caller */
 604         in6_ifa_hold(ifa);
 605
 606         /* Add to big hash table */
 607         hash = ipv6_addr_hash(addr);
 608
 609         ifa->lst_next = inet6_addr_lst[hash];
 610         inet6_addr_lst[hash] = ifa;
 611         in6_ifa_hold(ifa);
 612         write_unlock(&addrconf_hash_lock);
 613
 614         write_lock(&idev->lock);
 615         /* Add to inet6_dev unicast addr list. */
 616         ipv6_link_dev_addr(idev, ifa);
 617
 618 #ifdef CONFIG_IPV6_PRIVACY
 619         if (ifa->flags&IFA_F_TEMPORARY) {
 620                 ifa->tmp_next = idev->tempaddr_list;
 621                 idev->tempaddr_list = ifa;
 622                 in6_ifa_hold(ifa);
 623         }
 624 #endif
 625
 626         in6_ifa_hold(ifa);
 627         write_unlock(&idev->lock);
 628 out2:
 629         rcu_read_unlock_bh();
 630
 631         if (likely(err == 0))
 632                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 633         else {
 634                 kfree(ifa);
 635                 ifa = ERR_PTR(err);
 636         }
 637
 638         return ifa;
 639 out:
 640         write_unlock(&addrconf_hash_lock);
 641         goto out2;
 642 }
 643
 644 /* This function wants to get referenced ifp and releases it before return */
 645
 646 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 647 {
 648         struct inet6_ifaddr *ifa, **ifap;
 649         struct inet6_dev *idev = ifp->idev;
 650         int hash;
 651         int deleted = 0, onlink = 0;
 652         unsigned long expires = jiffies;
 653
 654         hash = ipv6_addr_hash(&ifp->addr);
 655
 656         ifp->dead = 1;
 657
 658         write_lock_bh(&addrconf_hash_lock);
 659         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 660              ifap = &ifa->lst_next) {
 661                 if (ifa == ifp) {
 662                         *ifap = ifa->lst_next;
 663                         __in6_ifa_put(ifp);
 664                         ifa->lst_next = NULL;
 665                         break;
 666                 }
 667         }
 668         write_unlock_bh(&addrconf_hash_lock);
 669
 670         write_lock_bh(&idev->lock);
 671 #ifdef CONFIG_IPV6_PRIVACY
 672         if (ifp->flags&IFA_F_TEMPORARY) {
 673                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 674                      ifap = &ifa->tmp_next) {
 675                         if (ifa == ifp) {
 676                                 *ifap = ifa->tmp_next;
 677                                 if (ifp->ifpub) {
 678                                         in6_ifa_put(ifp->ifpub);
 679                                         ifp->ifpub = NULL;
 680                                 }
 681                                 __in6_ifa_put(ifp);
 682                                 ifa->tmp_next = NULL;
 683                                 break;
 684                         }
 685                 }
 686         }
 687 #endif
 688
 689         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 690                 if (ifa == ifp) {
 691                         *ifap = ifa->if_next;
 692                         __in6_ifa_put(ifp);
 693                         ifa->if_next = NULL;
 694                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 695                                 break;
 696                         deleted = 1;
 697                         continue;
 698                 } else if (ifp->flags & IFA_F_PERMANENT) {
 699                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 700                                               ifp->prefix_len)) {
 701                                 if (ifa->flags & IFA_F_PERMANENT) {
 702                                         onlink = 1;
 703                                         if (deleted)
 704                                                 break;
 705                                 } else {
 706                                         unsigned long lifetime;
 707
 708                                         if (!onlink)
 709                                                 onlink = -1;
 710
 711                                         spin_lock(&ifa->lock);
 712                                         lifetime = min_t(unsigned long,
 713                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 714                                         if (time_before(expires,
 715                                                         ifa->tstamp + lifetime * HZ))
 716                                                 expires = ifa->tstamp + lifetime * HZ;
 717                                         spin_unlock(&ifa->lock);
 718                                 }
 719                         }
 720                 }
 721                 ifap = &ifa->if_next;
 722         }
 723         write_unlock_bh(&idev->lock);
 724
 725         ipv6_ifa_notify(RTM_DELADDR, ifp);
 726
 727         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 728
 729         addrconf_del_timer(ifp);
 730
 731         /*
 732          * Purge or update corresponding prefix
 733          *
 734          * 1) we don't purge prefix here if address was not permanent.
 735          *    prefix is managed by its own lifetime.
 736          * 2) if there're no addresses, delete prefix.
 737          * 3) if there're still other permanent address(es),
 738          *    corresponding prefix is still permanent.
 739          * 4) otherwise, update prefix lifetime to the
 740          *    longest valid lifetime among the corresponding
 741          *    addresses on the device.
 742          *    Note: subsequent RA will update lifetime.
 743          *
 744          * --yoshfuji
 745          */
 746         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 747                 struct in6_addr prefix;
 748                 struct rt6_info *rt;
 749
 750                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 751                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 752
 753                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 754                         if (onlink == 0) {
 755                                 ip6_del_rt(rt);
 756                                 rt = NULL;
 757                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 758                                 rt->rt6i_expires = expires;
 759                                 rt->rt6i_flags |= RTF_EXPIRES;
 760                         }
 761                 }
 762                 dst_release(&rt->u.dst);
 763         }
 764
 765         in6_ifa_put(ifp);
 766 }
 767
 768 #ifdef CONFIG_IPV6_PRIVACY
 769 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 770 {
 771         struct inet6_dev *idev = ifp->idev;
 772         struct in6_addr addr, *tmpaddr;
 773         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 774         int tmp_plen;
 775         int ret = 0;
 776         int max_addresses;
 777
 778         write_lock(&idev->lock);
 779         if (ift) {
 780                 spin_lock_bh(&ift->lock);
 781                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 782                 spin_unlock_bh(&ift->lock);
 783                 tmpaddr = &addr;
 784         } else {
 785                 tmpaddr = NULL;
 786         }
 787 retry:
 788         in6_dev_hold(idev);
 789         if (idev->cnf.use_tempaddr <= 0) {
 790                 write_unlock(&idev->lock);
 791                 printk(KERN_INFO
 792                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 793                 in6_dev_put(idev);
 794                 ret = -1;
 795                 goto out;
 796         }
 797         spin_lock_bh(&ifp->lock);
 798         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 799                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 800                 spin_unlock_bh(&ifp->lock);
 801                 write_unlock(&idev->lock);
 802                 printk(KERN_WARNING
 803                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 804                 in6_dev_put(idev);
 805                 ret = -1;
 806                 goto out;
 807         }
 808         in6_ifa_hold(ifp);
 809         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 810         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 811                 spin_unlock_bh(&ifp->lock);
 812                 write_unlock(&idev->lock);
 813                 printk(KERN_WARNING
 814                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 815                 in6_ifa_put(ifp);
 816                 in6_dev_put(idev);
 817                 ret = -1;
 818                 goto out;
 819         }
 820         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 821         tmp_valid_lft = min_t(__u32,
 822                               ifp->valid_lft,
 823                               idev->cnf.temp_valid_lft);
 824         tmp_prefered_lft = min_t(__u32,
 825                                  ifp->prefered_lft,
 826                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 827         tmp_plen = ifp->prefix_len;
 828         max_addresses = idev->cnf.max_addresses;
 829         tmp_cstamp = ifp->cstamp;
 830         tmp_tstamp = ifp->tstamp;
 831         spin_unlock_bh(&ifp->lock);
 832
 833         write_unlock(&idev->lock);
 834         ift = !max_addresses ||
 835               ipv6_count_addresses(idev) < max_addresses ?
 836                 ipv6_add_addr(idev, &addr, tmp_plen,
 837                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 838         if (!ift || IS_ERR(ift)) {
 839                 in6_ifa_put(ifp);
 840                 in6_dev_put(idev);
 841                 printk(KERN_INFO
 842                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 843                 tmpaddr = &addr;
 844                 write_lock(&idev->lock);
 845                 goto retry;
 846         }
 847
 848         spin_lock_bh(&ift->lock);
 849         ift->ifpub = ifp;
 850         ift->valid_lft = tmp_valid_lft;
 851         ift->prefered_lft = tmp_prefered_lft;
 852         ift->cstamp = tmp_cstamp;
 853         ift->tstamp = tmp_tstamp;
 854         spin_unlock_bh(&ift->lock);
 855
 856         addrconf_dad_start(ift, 0);
 857         in6_ifa_put(ift);
 858         in6_dev_put(idev);
 859 out:
 860         return ret;
 861 }
 862 #endif
 863
 864 /*
 865  *      Choose an appropriate source address (RFC3484)
 866  */
 867 struct ipv6_saddr_score {
 868         int             addr_type;
 869         unsigned int    attrs;
 870         int             matchlen;
 871         int             scope;
 872         unsigned int    rule;
 873 };
 874
 875 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 876 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 877 #define IPV6_SADDR_SCORE_HOA            0x0008
 878 #define IPV6_SADDR_SCORE_OIF            0x0010
 879 #define IPV6_SADDR_SCORE_LABEL          0x0020
 880 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 881
 882 static int inline ipv6_saddr_preferred(int type)
 883 {
 884         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 885                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 886                 return 1;
 887         return 0;
 888 }
 889
 890 /* static matching label */
 891 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 892 {
 893  /*
 894   *     prefix (longest match)  label
 895   *     -----------------------------
 896   *     ::1/128                 0
 897   *     ::/0                    1
 898   *     2002::/16               2
 899   *     ::/96                   3
 900   *     ::ffff:0:0/96           4
 901   *     fc00::/7                5
 902   *     2001::/32               6
 903   */
 904         if (type & IPV6_ADDR_LOOPBACK)
 905                 return 0;
 906         else if (type & IPV6_ADDR_COMPATv4)
 907                 return 3;
 908         else if (type & IPV6_ADDR_MAPPED)
 909                 return 4;
 910         else if (addr->s6_addr32[0] == htonl(0x20010000))
 911                 return 6;
 912         else if (addr->s6_addr16[0] == htons(0x2002))
 913                 return 2;
 914         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 915                 return 5;
 916         return 1;
 917 }
 918
 919 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 920                        struct in6_addr *daddr, struct in6_addr *saddr, struct nx_info *nxi)
 921 {
 922         struct ipv6_saddr_score hiscore;
 923         struct inet6_ifaddr *ifa_result = NULL;
 924         int daddr_type = __ipv6_addr_type(daddr);
 925         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 926         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 927         struct net_device *dev;
 928
 929         memset(&hiscore, 0, sizeof(hiscore));
 930
 931         read_lock(&dev_base_lock);
 932         rcu_read_lock();
 933
 934         for (dev = dev_base; dev; dev=dev->next) {
 935                 struct inet6_dev *idev;
 936                 struct inet6_ifaddr *ifa;
 937
 938                 /* Rule 0: Candidate Source Address (section 4)
 939                  *  - multicast and link-local destination address,
 940                  *    the set of candidate source address MUST only
 941                  *    include addresses assigned to interfaces
 942                  *    belonging to the same link as the outgoing
 943                  *    interface.
 944                  * (- For site-local destination addresses, the
 945                  *    set of candidate source addresses MUST only
 946                  *    include addresses assigned to interfaces
 947                  *    belonging to the same site as the outgoing
 948                  *    interface.)
 949                  */
 950                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 951                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 952                     daddr_dev && dev != daddr_dev)
 953                         continue;
 954
 955                 idev = __in6_dev_get(dev);
 956                 if (!idev)
 957                         continue;
 958
 959                 read_lock_bh(&idev->lock);
 960                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 961                         struct ipv6_saddr_score score;
 962
 963                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 964
 965                         /* Linux-VServer: only take into account addresses
 966                            available in guest context! */
 967                         if (!addr6_in_nx_info(nxi, &ifa->addr))
 968                                 continue;
 969
 970                         /* Rule 0:
 971                          * - Tentative Address (RFC2462 section 5.4)
 972                          *  - A tentative address is not considered
 973                          *    "assigned to an interface" in the traditional
 974                          *    sense.
 975                          * - Candidate Source Address (section 4)
 976                          *  - In any case, anycast addresses, multicast
 977                          *    addresses, and the unspecified address MUST
 978                          *    NOT be included in a candidate set.
 979                          */
 980                         if (ifa->flags & IFA_F_TENTATIVE)
 981                                 continue;
 982                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 983                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 984                                 LIMIT_NETDEBUG(KERN_DEBUG
 985                                                "ADDRCONF: unspecified / multicast address"
 986                                                "assigned as unicast address on %s",
 987                                                dev->name);
 988                                 continue;
 989                         }
 990
 991                         score.attrs = 0;
 992                         score.matchlen = 0;
 993                         score.scope = 0;
 994                         score.rule = 0;
 995
 996                         if (ifa_result == NULL) {
 997                                 /* record it if the first available entry */
 998                                 goto record_it;
 999                         }
1000
1001                         /* Rule 1: Prefer same address */
1002                         if (hiscore.rule < 1) {
1003                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
1004                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
1005                                 hiscore.rule++;
1006                         }
1007                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
1008                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
1009                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1010                                         score.rule = 1;
1011                                         goto record_it;
1012                                 }
1013                         } else {
1014                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1015                                         continue;
1016                         }
1017
1018                         /* Rule 2: Prefer appropriate scope */
1019                         if (hiscore.rule < 2) {
1020                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1021                                 hiscore.rule++;
1022                         }
1023                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1024                         if (hiscore.scope < score.scope) {
1025                                 if (hiscore.scope < daddr_scope) {
1026                                         score.rule = 2;
1027                                         goto record_it;
1028                                 } else
1029                                         continue;
1030                         } else if (score.scope < hiscore.scope) {
1031                                 if (score.scope < daddr_scope)
1032                                         break; /* addresses sorted by scope */
1033                                 else {
1034                                         score.rule = 2;
1035                                         goto record_it;
1036                                 }
1037                         }
1038
1039                         /* Rule 3: Avoid deprecated address */
1040                         if (hiscore.rule < 3) {
1041                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1042                                     !(ifa_result->flags & IFA_F_DEPRECATED))
1043                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1044                                 hiscore.rule++;
1045                         }
1046                         if (ipv6_saddr_preferred(score.addr_type) ||
1047                             !(ifa->flags & IFA_F_DEPRECATED)) {
1048                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1049                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1050                                         score.rule = 3;
1051                                         goto record_it;
1052                                 }
1053                         } else {
1054                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1055                                         continue;
1056                         }
1057
1058                         /* Rule 4: Prefer home address */
1059 #ifdef CONFIG_IPV6_MIP6
1060                         if (hiscore.rule < 4) {
1061                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1062                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1063                                 hiscore.rule++;
1064                         }
1065                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1066                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1067                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1068                                         score.rule = 4;
1069                                         goto record_it;
1070                                 }
1071                         } else {
1072                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1073                                         continue;
1074                         }
1075 #else
1076                         if (hiscore.rule < 4)
1077                                 hiscore.rule++;
1078 #endif
1079
1080                         /* Rule 5: Prefer outgoing interface */
1081                         if (hiscore.rule < 5) {
1082                                 if (daddr_dev == NULL ||
1083                                     daddr_dev == ifa_result->idev->dev)
1084                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1085                                 hiscore.rule++;
1086                         }
1087                         if (daddr_dev == NULL ||
1088                             daddr_dev == ifa->idev->dev) {
1089                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1090                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1091                                         score.rule = 5;
1092                                         goto record_it;
1093                                 }
1094                         } else {
1095                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1096                                         continue;
1097                         }
1098
1099                         /* Rule 6: Prefer matching label */
1100                         if (hiscore.rule < 6) {
1101                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1102                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1103                                 hiscore.rule++;
1104                         }
1105                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1106                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1107                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1108                                         score.rule = 6;
1109                                         goto record_it;
1110                                 }
1111                         } else {
1112                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1113                                         continue;
1114                         }
1115
1116 #ifdef CONFIG_IPV6_PRIVACY
1117                         /* Rule 7: Prefer public address
1118                          * Note: prefer temprary address if use_tempaddr >= 2
1119                          */
1120                         if (hiscore.rule < 7) {
1121                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1122                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1123                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1124                                 hiscore.rule++;
1125                         }
1126                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1127                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1128                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1129                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1130                                         score.rule = 7;
1131                                         goto record_it;
1132                                 }
1133                         } else {
1134                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1135                                         continue;
1136                         }
1137 #else
1138                         if (hiscore.rule < 7)
1139                                 hiscore.rule++;
1140 #endif
1141                         /* Rule 8: Use longest matching prefix */
1142                         if (hiscore.rule < 8) {
1143                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1144                                 hiscore.rule++;
1145                         }
1146                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1147                         if (score.matchlen > hiscore.matchlen) {
1148                                 score.rule = 8;
1149                                 goto record_it;
1150                         }
1151 #if 0
1152                         else if (score.matchlen < hiscore.matchlen)
1153                                 continue;
1154 #endif
1155
1156                         /* Final Rule: choose first available one */
1157                         continue;
1158 record_it:
1159                         if (ifa_result)
1160                                 in6_ifa_put(ifa_result);
1161                         in6_ifa_hold(ifa);
1162                         ifa_result = ifa;
1163                         hiscore = score;
1164                 }
1165                 read_unlock_bh(&idev->lock);
1166         }
1167         rcu_read_unlock();
1168         read_unlock(&dev_base_lock);
1169
1170         if (!ifa_result)
1171                 return -EADDRNOTAVAIL;
1172
1173         ipv6_addr_copy(saddr, &ifa_result->addr);
1174         in6_ifa_put(ifa_result);
1175         return 0;
1176 }
1177
1178
1179 int ipv6_get_saddr(struct dst_entry *dst,
1180                    struct in6_addr *daddr, struct in6_addr *saddr, struct nx_info *nxi)
1181 {
1182         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr, nxi);
1183 }
1184
1185
1186 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1187 {
1188         struct inet6_dev *idev;
1189         int err = -EADDRNOTAVAIL;
1190
1191         rcu_read_lock();
1192         if ((idev = __in6_dev_get(dev)) != NULL) {
1193                 struct inet6_ifaddr *ifp;
1194
1195                 read_lock_bh(&idev->lock);
1196                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1197                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1198                                 ipv6_addr_copy(addr, &ifp->addr);
1199                                 err = 0;
1200                                 break;
1201                         }
1202                 }
1203                 read_unlock_bh(&idev->lock);
1204         }
1205         rcu_read_unlock();
1206         return err;
1207 }
1208
1209 static int ipv6_count_addresses(struct inet6_dev *idev)
1210 {
1211         int cnt = 0;
1212         struct inet6_ifaddr *ifp;
1213
1214         read_lock_bh(&idev->lock);
1215         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1216                 cnt++;
1217         read_unlock_bh(&idev->lock);
1218         return cnt;
1219 }
1220
1221 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1222 {
1223         struct inet6_ifaddr * ifp;
1224         u8 hash = ipv6_addr_hash(addr);
1225
1226         read_lock_bh(&addrconf_hash_lock);
1227         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1228                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1229                     !(ifp->flags&IFA_F_TENTATIVE)) {
1230                         if (dev == NULL || ifp->idev->dev == dev ||
1231                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1232                                 break;
1233                 }
1234         }
1235         read_unlock_bh(&addrconf_hash_lock);
1236         return ifp != NULL;
1237 }
1238
1239 static
1240 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1241 {
1242         struct inet6_ifaddr * ifp;
1243         u8 hash = ipv6_addr_hash(addr);
1244
1245         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1246                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1247                         if (dev == NULL || ifp->idev->dev == dev)
1248                                 break;
1249                 }
1250         }
1251         return ifp != NULL;
1252 }
1253
1254 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1255 {
1256         struct inet6_ifaddr * ifp;
1257         u8 hash = ipv6_addr_hash(addr);
1258
1259         read_lock_bh(&addrconf_hash_lock);
1260         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1261                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1262                         if (dev == NULL || ifp->idev->dev == dev ||
1263                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1264                                 in6_ifa_hold(ifp);
1265                                 break;
1266                         }
1267                 }
1268         }
1269         read_unlock_bh(&addrconf_hash_lock);
1270
1271         return ifp;
1272 }
1273
1274 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1275 {
1276         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1277         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1278         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1279         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1280         int sk_ipv6only = ipv6_only_sock(sk);
1281         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1282         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1283         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1284
1285         if (sk->sk_nid != sk2->sk_nid) {
1286                 // either socket is in host context and bound to everything
1287                 if (sk->sk_nx_info == NULL && addr_type == IPV6_ADDR_ANY && !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1288                         return 1;
1289                 if (sk2->sk_nx_info == NULL && addr_type2 == IPV6_ADDR_ANY && !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1290                         return 1;
1291                 // If both addresses are equal
1292                 if (sk2_rcv_saddr6 && ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1293                         return 1;
1294                 // If one socket bound to everything and the addr bound by other socket is in first context
1295                 if (addr_type2 == IPV6_ADDR_ANY && !(addr_type == IPV6_ADDR_ANY || addr_type == IPV6_ADDR_MAPPED) &&
1296                     addr6_in_nx_info(sk2->sk_nx_info, sk_rcv_saddr6))
1297                         return 1;
1298                 if (addr_type == IPV6_ADDR_ANY && !(addr_type2 == IPV6_ADDR_ANY || addr_type2 == IPV6_ADDR_MAPPED) &&
1299                     sk2_rcv_saddr6 && addr6_in_nx_info(sk->sk_nx_info, sk2_rcv_saddr6))
1300                         return 1;
1301                 // both sockets are in guests and bound to everything with addr-overlap between guests
1302                 if (sk->sk_nx_info && sk2->sk_nx_info && addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY &&
1303                     nx_addr6_conflict(sk->sk_nx_info, sk2->sk_nx_info))
1304                         return 1;
1305                 // TODO: handle the IPv4 addresses mapped in IPv6 completely...
1306         } else {
1307                 if (!sk2_rcv_saddr && !sk_ipv6only)
1308                         return 1;
1309
1310                 if (addr_type2 == IPV6_ADDR_ANY &&
1311                     !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1312                         return 1;
1313
1314                 if (addr_type == IPV6_ADDR_ANY &&
1315                     !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1316                         return 1;
1317
1318                 if (sk2_rcv_saddr6 &&
1319                     ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1320                         return 1;
1321
1322                 if (addr_type == IPV6_ADDR_MAPPED &&
1323                     !sk2_ipv6only &&
1324                     (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1325                         return 1;
1326         }
1327         return 0;
1328 }
1329
1330 /* Gets referenced address, destroys ifaddr */
1331
1332 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1333 {
1334         if (ifp->flags&IFA_F_PERMANENT) {
1335                 spin_lock_bh(&ifp->lock);
1336                 addrconf_del_timer(ifp);
1337                 ifp->flags |= IFA_F_TENTATIVE;
1338                 spin_unlock_bh(&ifp->lock);
1339                 in6_ifa_put(ifp);
1340 #ifdef CONFIG_IPV6_PRIVACY
1341         } else if (ifp->flags&IFA_F_TEMPORARY) {
1342                 struct inet6_ifaddr *ifpub;
1343                 spin_lock_bh(&ifp->lock);
1344                 ifpub = ifp->ifpub;
1345                 if (ifpub) {
1346                         in6_ifa_hold(ifpub);
1347                         spin_unlock_bh(&ifp->lock);
1348                         ipv6_create_tempaddr(ifpub, ifp);
1349                         in6_ifa_put(ifpub);
1350                 } else {
1351                         spin_unlock_bh(&ifp->lock);
1352                 }
1353                 ipv6_del_addr(ifp);
1354 #endif
1355         } else
1356                 ipv6_del_addr(ifp);
1357 }
1358
1359 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1360 {
1361         if (net_ratelimit())
1362                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1363         addrconf_dad_stop(ifp);
1364 }
1365
1366 /* Join to solicited addr multicast group. */
1367
1368 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1369 {
1370         struct in6_addr maddr;
1371
1372         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1373                 return;
1374
1375         addrconf_addr_solict_mult(addr, &maddr);
1376         ipv6_dev_mc_inc(dev, &maddr);
1377 }
1378
1379 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1380 {
1381         struct in6_addr maddr;
1382
1383         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1384                 return;
1385
1386         addrconf_addr_solict_mult(addr, &maddr);
1387         __ipv6_dev_mc_dec(idev, &maddr);
1388 }
1389
1390 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1391 {
1392         struct in6_addr addr;
1393         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1394         if (ipv6_addr_any(&addr))
1395                 return;
1396         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1397 }
1398
1399 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1400 {
1401         struct in6_addr addr;
1402         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1403         if (ipv6_addr_any(&addr))
1404                 return;
1405         __ipv6_dev_ac_dec(ifp->idev, &addr);
1406 }
1407
1408 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1409 {
1410         if (dev->addr_len != ETH_ALEN)
1411                 return -1;
1412         memcpy(eui, dev->dev_addr, 3);
1413         memcpy(eui + 5, dev->dev_addr + 3, 3);
1414
1415         /*
1416          * The zSeries OSA network cards can be shared among various
1417          * OS instances, but the OSA cards have only one MAC address.
1418          * This leads to duplicate address conflicts in conjunction
1419          * with IPv6 if more than one instance uses the same card.
1420          *
1421          * The driver for these cards can deliver a unique 16-bit
1422          * identifier for each instance sharing the same card.  It is
1423          * placed instead of 0xFFFE in the interface identifier.  The
1424          * "u" bit of the interface identifier is not inverted in this
1425          * case.  Hence the resulting interface identifier has local
1426          * scope according to RFC2373.
1427          */
1428         if (dev->dev_id) {
1429                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1430                 eui[4] = dev->dev_id & 0xFF;
1431         } else {
1432                 eui[3] = 0xFF;
1433                 eui[4] = 0xFE;
1434                 eui[0] ^= 2;
1435         }
1436         return 0;
1437 }
1438
1439 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1440 {
1441         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1442         if (dev->addr_len != ARCNET_ALEN)
1443                 return -1;
1444         memset(eui, 0, 7);
1445         eui[7] = *(u8*)dev->dev_addr;
1446         return 0;
1447 }
1448
1449 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1450 {
1451         if (dev->addr_len != INFINIBAND_ALEN)
1452                 return -1;
1453         memcpy(eui, dev->dev_addr + 12, 8);
1454         eui[0] |= 2;
1455         return 0;
1456 }
1457
1458 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1459 {
1460         switch (dev->type) {
1461         case ARPHRD_ETHER:
1462         case ARPHRD_FDDI:
1463         case ARPHRD_IEEE802_TR:
1464                 return addrconf_ifid_eui48(eui, dev);
1465         case ARPHRD_ARCNET:
1466                 return addrconf_ifid_arcnet(eui, dev);
1467         case ARPHRD_INFINIBAND:
1468                 return addrconf_ifid_infiniband(eui, dev);
1469         }
1470         return -1;
1471 }
1472
1473 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1474 {
1475         int err = -1;
1476         struct inet6_ifaddr *ifp;
1477
1478         read_lock_bh(&idev->lock);
1479         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1480                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1481                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1482                         err = 0;
1483                         break;
1484                 }
1485         }
1486         read_unlock_bh(&idev->lock);
1487         return err;
1488 }
1489
1490 #ifdef CONFIG_IPV6_PRIVACY
1491 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1492 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1493 {
1494 regen:
1495         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1496         idev->rndid[0] &= ~0x02;
1497
1498         /*
1499          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1500          * check if generated address is not inappropriate
1501          *
1502          *  - Reserved subnet anycast (RFC 2526)
1503          *      11111101 11....11 1xxxxxxx
1504          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1505          *      00-00-5E-FE-xx-xx-xx-xx
1506          *  - value 0
1507          *  - XXX: already assigned to an address on the device
1508          */
1509         if (idev->rndid[0] == 0xfd &&
1510             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1511             (idev->rndid[7]&0x80))
1512                 goto regen;
1513         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1514                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1515                         goto regen;
1516                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1517                         goto regen;
1518         }
1519
1520         return 0;
1521 }
1522
1523 static void ipv6_regen_rndid(unsigned long data)
1524 {
1525         struct inet6_dev *idev = (struct inet6_dev *) data;
1526         unsigned long expires;
1527
1528         rcu_read_lock_bh();
1529         write_lock_bh(&idev->lock);
1530
1531         if (idev->dead)
1532                 goto out;
1533
1534         if (__ipv6_regen_rndid(idev) < 0)
1535                 goto out;
1536
1537         expires = jiffies +
1538                 idev->cnf.temp_prefered_lft * HZ -
1539                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1540         if (time_before(expires, jiffies)) {
1541                 printk(KERN_WARNING
1542                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1543                         idev->dev->name);
1544                 goto out;
1545         }
1546
1547         if (!mod_timer(&idev->regen_timer, expires))
1548                 in6_dev_hold(idev);
1549
1550 out:
1551         write_unlock_bh(&idev->lock);
1552         rcu_read_unlock_bh();
1553         in6_dev_put(idev);
1554 }
1555
1556 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1557         int ret = 0;
1558
1559         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1560                 ret = __ipv6_regen_rndid(idev);
1561         return ret;
1562 }
1563 #endif
1564
1565 /*
1566  *      Add prefix route.
1567  */
1568
1569 static void
1570 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1571                       unsigned long expires, u32 flags)
1572 {
1573         struct fib6_config cfg = {
1574                 .fc_table = RT6_TABLE_PREFIX,
1575                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1576                 .fc_ifindex = dev->ifindex,
1577                 .fc_expires = expires,
1578                 .fc_dst_len = plen,
1579                 .fc_flags = RTF_UP | flags,
1580         };
1581
1582         ipv6_addr_copy(&cfg.fc_dst, pfx);
1583
1584         /* Prevent useless cloning on PtP SIT.
1585            This thing is done here expecting that the whole
1586            class of non-broadcast devices need not cloning.
1587          */
1588 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1589         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1590                 cfg.fc_flags |= RTF_NONEXTHOP;
1591 #endif
1592
1593         ip6_route_add(&cfg);
1594 }
1595
1596 /* Create "default" multicast route to the interface */
1597
1598 static void addrconf_add_mroute(struct net_device *dev)
1599 {
1600         struct fib6_config cfg = {
1601                 .fc_table = RT6_TABLE_LOCAL,
1602                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1603                 .fc_ifindex = dev->ifindex,
1604                 .fc_dst_len = 8,
1605                 .fc_flags = RTF_UP,
1606         };
1607
1608         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1609
1610         ip6_route_add(&cfg);
1611 }
1612
1613 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1614 static void sit_route_add(struct net_device *dev)
1615 {
1616         struct fib6_config cfg = {
1617                 .fc_table = RT6_TABLE_MAIN,
1618                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1619                 .fc_ifindex = dev->ifindex,
1620                 .fc_dst_len = 96,
1621                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1622         };
1623
1624         /* prefix length - 96 bits "::d.d.d.d" */
1625         ip6_route_add(&cfg);
1626 }
1627 #endif
1628
1629 static void addrconf_add_lroute(struct net_device *dev)
1630 {
1631         struct in6_addr addr;
1632
1633         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1634         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1635 }
1636
1637 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1638 {
1639         struct inet6_dev *idev;
1640
1641         ASSERT_RTNL();
1642
1643         if ((idev = ipv6_find_idev(dev)) == NULL)
1644                 return NULL;
1645
1646         /* Add default multicast route */
1647         addrconf_add_mroute(dev);
1648
1649         /* Add link local route */
1650         addrconf_add_lroute(dev);
1651         return idev;
1652 }
1653
1654 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1655 {
1656         struct prefix_info *pinfo;
1657         __u32 valid_lft;
1658         __u32 prefered_lft;
1659         int addr_type;
1660         unsigned long rt_expires;
1661         struct inet6_dev *in6_dev;
1662
1663         pinfo = (struct prefix_info *) opt;
1664
1665         if (len < sizeof(struct prefix_info)) {
1666                 ADBG(("addrconf: prefix option too short\n"));
1667                 return;
1668         }
1669
1670         /*
1671          *      Validation checks ([ADDRCONF], page 19)
1672          */
1673
1674         addr_type = ipv6_addr_type(&pinfo->prefix);
1675
1676         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1677                 return;
1678
1679         valid_lft = ntohl(pinfo->valid);
1680         prefered_lft = ntohl(pinfo->prefered);
1681
1682         if (prefered_lft > valid_lft) {
1683                 if (net_ratelimit())
1684                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1685                 return;
1686         }
1687
1688         in6_dev = in6_dev_get(dev);
1689
1690         if (in6_dev == NULL) {
1691                 if (net_ratelimit())
1692                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1693                 return;
1694         }
1695
1696         /*
1697          *      Two things going on here:
1698          *      1) Add routes for on-link prefixes
1699          *      2) Configure prefixes with the auto flag set
1700          */
1701
1702         /* Avoid arithmetic overflow. Really, we could
1703            save rt_expires in seconds, likely valid_lft,
1704            but it would require division in fib gc, that it
1705            not good.
1706          */
1707         if (valid_lft >= 0x7FFFFFFF/HZ)
1708                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1709         else
1710                 rt_expires = valid_lft * HZ;
1711
1712         /*
1713          * We convert this (in jiffies) to clock_t later.
1714          * Avoid arithmetic overflow there as well.
1715          * Overflow can happen only if HZ < USER_HZ.
1716          */
1717         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1718                 rt_expires = 0x7FFFFFFF / USER_HZ;
1719
1720         if (pinfo->onlink) {
1721                 struct rt6_info *rt;
1722                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1723
1724                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1725                         if (rt->rt6i_flags&RTF_EXPIRES) {
1726                                 if (valid_lft == 0) {
1727                                         ip6_del_rt(rt);
1728                                         rt = NULL;
1729                                 } else {
1730                                         rt->rt6i_expires = jiffies + rt_expires;
1731                                 }
1732                         }
1733                 } else if (valid_lft) {
1734                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1735                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1736                 }
1737                 if (rt)
1738                         dst_release(&rt->u.dst);
1739         }
1740
1741         /* Try to figure out our local address for this prefix */
1742
1743         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1744                 struct inet6_ifaddr * ifp;
1745                 struct in6_addr addr;
1746                 int create = 0, update_lft = 0;
1747
1748                 if (pinfo->prefix_len == 64) {
1749                         memcpy(&addr, &pinfo->prefix, 8);
1750                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1751                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1752                                 in6_dev_put(in6_dev);
1753                                 return;
1754                         }
1755                         goto ok;
1756                 }
1757                 if (net_ratelimit())
1758                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1759                                pinfo->prefix_len);
1760                 in6_dev_put(in6_dev);
1761                 return;
1762
1763 ok:
1764
1765                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1766
1767                 if (ifp == NULL && valid_lft) {
1768                         int max_addresses = in6_dev->cnf.max_addresses;
1769
1770                         /* Do not allow to create too much of autoconfigured
1771                          * addresses; this would be too easy way to crash kernel.
1772                          */
1773                         if (!max_addresses ||
1774                             ipv6_count_addresses(in6_dev) < max_addresses)
1775                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1776                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1777
1778                         if (!ifp || IS_ERR(ifp)) {
1779                                 in6_dev_put(in6_dev);
1780                                 return;
1781                         }
1782
1783                         update_lft = create = 1;
1784                         ifp->cstamp = jiffies;
1785                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1786                 }
1787
1788                 if (ifp) {
1789                         int flags;
1790                         unsigned long now;
1791 #ifdef CONFIG_IPV6_PRIVACY
1792                         struct inet6_ifaddr *ift;
1793 #endif
1794                         u32 stored_lft;
1795
1796                         /* update lifetime (RFC2462 5.5.3 e) */
1797                         spin_lock(&ifp->lock);
1798                         now = jiffies;
1799                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1800                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1801                         else
1802                                 stored_lft = 0;
1803                         if (!update_lft && stored_lft) {
1804                                 if (valid_lft > MIN_VALID_LIFETIME ||
1805                                     valid_lft > stored_lft)
1806                                         update_lft = 1;
1807                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1808                                         /* valid_lft <= stored_lft is always true */
1809                                         /* XXX: IPsec */
1810                                         update_lft = 0;
1811                                 } else {
1812                                         valid_lft = MIN_VALID_LIFETIME;
1813                                         if (valid_lft < prefered_lft)
1814                                                 prefered_lft = valid_lft;
1815                                         update_lft = 1;
1816                                 }
1817                         }
1818
1819                         if (update_lft) {
1820                                 ifp->valid_lft = valid_lft;
1821                                 ifp->prefered_lft = prefered_lft;
1822                                 ifp->tstamp = now;
1823                                 flags = ifp->flags;
1824                                 ifp->flags &= ~IFA_F_DEPRECATED;
1825                                 spin_unlock(&ifp->lock);
1826
1827                                 if (!(flags&IFA_F_TENTATIVE))
1828                                         ipv6_ifa_notify(0, ifp);
1829                         } else
1830                                 spin_unlock(&ifp->lock);
1831
1832 #ifdef CONFIG_IPV6_PRIVACY
1833                         read_lock_bh(&in6_dev->lock);
1834                         /* update all temporary addresses in the list */
1835                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1836                                 /*
1837                                  * When adjusting the lifetimes of an existing
1838                                  * temporary address, only lower the lifetimes.
1839                                  * Implementations must not increase the
1840                                  * lifetimes of an existing temporary address
1841                                  * when processing a Prefix Information Option.
1842                                  */
1843                                 spin_lock(&ift->lock);
1844                                 flags = ift->flags;
1845                                 if (ift->valid_lft > valid_lft &&
1846                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1847                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1848                                 if (ift->prefered_lft > prefered_lft &&
1849                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1850                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1851                                 spin_unlock(&ift->lock);
1852                                 if (!(flags&IFA_F_TENTATIVE))
1853                                         ipv6_ifa_notify(0, ift);
1854                         }
1855
1856                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1857                                 /*
1858                                  * When a new public address is created as described in [ADDRCONF],
1859                                  * also create a new temporary address.
1860                                  */
1861                                 read_unlock_bh(&in6_dev->lock);
1862                                 ipv6_create_tempaddr(ifp, NULL);
1863                         } else {
1864                                 read_unlock_bh(&in6_dev->lock);
1865                         }
1866 #endif
1867                         in6_ifa_put(ifp);
1868                         addrconf_verify(0);
1869                 }
1870         }
1871         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1872         in6_dev_put(in6_dev);
1873 }
1874
1875 /*
1876  *      Set destination address.
1877  *      Special case for SIT interfaces where we create a new "virtual"
1878  *      device.
1879  */
1880 int addrconf_set_dstaddr(void __user *arg)
1881 {
1882         struct in6_ifreq ireq;
1883         struct net_device *dev;
1884         int err = -EINVAL;
1885
1886         rtnl_lock();
1887
1888         err = -EFAULT;
1889         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1890                 goto err_exit;
1891
1892         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1893
1894         err = -ENODEV;
1895         if (dev == NULL)
1896                 goto err_exit;
1897
1898 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1899         if (dev->type == ARPHRD_SIT) {
1900                 struct ifreq ifr;
1901                 mm_segment_t    oldfs;
1902                 struct ip_tunnel_parm p;
1903
1904                 err = -EADDRNOTAVAIL;
1905                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1906                         goto err_exit;
1907
1908                 memset(&p, 0, sizeof(p));
1909                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1910                 p.iph.saddr = 0;
1911                 p.iph.version = 4;
1912                 p.iph.ihl = 5;
1913                 p.iph.protocol = IPPROTO_IPV6;
1914                 p.iph.ttl = 64;
1915                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1916
1917                 oldfs = get_fs(); set_fs(KERNEL_DS);
1918                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1919                 set_fs(oldfs);
1920
1921                 if (err == 0) {
1922                         err = -ENOBUFS;
1923                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1924                                 goto err_exit;
1925                         err = dev_open(dev);
1926                 }
1927         }
1928 #endif
1929
1930 err_exit:
1931         rtnl_unlock();
1932         return err;
1933 }
1934
1935 /*
1936  *      Manual configuration of address on an interface
1937  */
1938 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1939                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1940 {
1941         struct inet6_ifaddr *ifp;
1942         struct inet6_dev *idev;
1943         struct net_device *dev;
1944         int scope;
1945
1946         ASSERT_RTNL();
1947
1948         /* check the lifetime */
1949         if (!valid_lft || prefered_lft > valid_lft)
1950                 return -EINVAL;
1951
1952         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1953                 return -ENODEV;
1954
1955         if ((idev = addrconf_add_dev(dev)) == NULL)
1956                 return -ENOBUFS;
1957
1958         scope = ipv6_addr_scope(pfx);
1959
1960         if (valid_lft == INFINITY_LIFE_TIME)
1961                 ifa_flags |= IFA_F_PERMANENT;
1962         else if (valid_lft >= 0x7FFFFFFF/HZ)
1963                 valid_lft = 0x7FFFFFFF/HZ;
1964
1965         if (prefered_lft == 0)
1966                 ifa_flags |= IFA_F_DEPRECATED;
1967         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1968                  (prefered_lft != INFINITY_LIFE_TIME))
1969                 prefered_lft = 0x7FFFFFFF/HZ;
1970
1971         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1972
1973         if (!IS_ERR(ifp)) {
1974                 spin_lock_bh(&ifp->lock);
1975                 ifp->valid_lft = valid_lft;
1976                 ifp->prefered_lft = prefered_lft;
1977                 ifp->tstamp = jiffies;
1978                 spin_unlock_bh(&ifp->lock);
1979
1980                 addrconf_dad_start(ifp, 0);
1981                 in6_ifa_put(ifp);
1982                 addrconf_verify(0);
1983                 return 0;
1984         }
1985
1986         return PTR_ERR(ifp);
1987 }
1988
1989 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1990 {
1991         struct inet6_ifaddr *ifp;
1992         struct inet6_dev *idev;
1993         struct net_device *dev;
1994
1995         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1996                 return -ENODEV;
1997
1998         if ((idev = __in6_dev_get(dev)) == NULL)
1999                 return -ENXIO;
2000
2001         read_lock_bh(&idev->lock);
2002         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2003                 if (ifp->prefix_len == plen &&
2004                     ipv6_addr_equal(pfx, &ifp->addr)) {
2005                         in6_ifa_hold(ifp);
2006                         read_unlock_bh(&idev->lock);
2007
2008                         ipv6_del_addr(ifp);
2009
2010                         /* If the last address is deleted administratively,
2011                            disable IPv6 on this interface.
2012                          */
2013                         if (idev->addr_list == NULL)
2014                                 addrconf_ifdown(idev->dev, 1);
2015                         return 0;
2016                 }
2017         }
2018         read_unlock_bh(&idev->lock);
2019         return -EADDRNOTAVAIL;
2020 }
2021
2022
2023 int addrconf_add_ifaddr(void __user *arg)
2024 {
2025         struct in6_ifreq ireq;
2026         int err;
2027
2028         if (!capable(CAP_NET_ADMIN))
2029                 return -EPERM;
2030
2031         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2032                 return -EFAULT;
2033
2034         rtnl_lock();
2035         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2036                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2037         rtnl_unlock();
2038         return err;
2039 }
2040
2041 int addrconf_del_ifaddr(void __user *arg)
2042 {
2043         struct in6_ifreq ireq;
2044         int err;
2045
2046         if (!capable(CAP_NET_ADMIN))
2047                 return -EPERM;
2048
2049         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2050                 return -EFAULT;
2051
2052         rtnl_lock();
2053         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2054         rtnl_unlock();
2055         return err;
2056 }
2057
2058 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2059 static void sit_add_v4_addrs(struct inet6_dev *idev)
2060 {
2061         struct inet6_ifaddr * ifp;
2062         struct in6_addr addr;
2063         struct net_device *dev;
2064         int scope;
2065
2066         ASSERT_RTNL();
2067
2068         memset(&addr, 0, sizeof(struct in6_addr));
2069         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2070
2071         if (idev->dev->flags&IFF_POINTOPOINT) {
2072                 addr.s6_addr32[0] = htonl(0xfe800000);
2073                 scope = IFA_LINK;
2074         } else {
2075                 scope = IPV6_ADDR_COMPATv4;
2076         }
2077
2078         if (addr.s6_addr32[3]) {
2079                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2080                 if (!IS_ERR(ifp)) {
2081                         spin_lock_bh(&ifp->lock);
2082                         ifp->flags &= ~IFA_F_TENTATIVE;
2083                         spin_unlock_bh(&ifp->lock);
2084                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2085                         in6_ifa_put(ifp);
2086                 }
2087                 return;
2088         }
2089
2090         for (dev = dev_base; dev != NULL; dev = dev->next) {
2091                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2092                 if (in_dev && (dev->flags & IFF_UP)) {
2093                         struct in_ifaddr * ifa;
2094
2095                         int flag = scope;
2096
2097                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2098                                 int plen;
2099
2100                                 addr.s6_addr32[3] = ifa->ifa_local;
2101
2102                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2103                                         continue;
2104                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2105                                         if (idev->dev->flags&IFF_POINTOPOINT)
2106                                                 continue;
2107                                         flag |= IFA_HOST;
2108                                 }
2109                                 if (idev->dev->flags&IFF_POINTOPOINT)
2110                                         plen = 64;
2111                                 else
2112                                         plen = 96;
2113
2114                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2115                                                     IFA_F_PERMANENT);
2116                                 if (!IS_ERR(ifp)) {
2117                                         spin_lock_bh(&ifp->lock);
2118                                         ifp->flags &= ~IFA_F_TENTATIVE;
2119                                         spin_unlock_bh(&ifp->lock);
2120                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2121                                         in6_ifa_put(ifp);
2122                                 }
2123                         }
2124                 }
2125         }
2126 }
2127 #endif
2128
2129 static void init_loopback(struct net_device *dev)
2130 {
2131         struct inet6_dev  *idev;
2132         struct inet6_ifaddr * ifp;
2133
2134         /* ::1 */
2135
2136         ASSERT_RTNL();
2137
2138         if ((idev = ipv6_find_idev(dev)) == NULL) {
2139                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2140                 return;
2141         }
2142
2143         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2144         if (!IS_ERR(ifp)) {
2145                 spin_lock_bh(&ifp->lock);
2146                 ifp->flags &= ~IFA_F_TENTATIVE;
2147                 spin_unlock_bh(&ifp->lock);
2148                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2149                 in6_ifa_put(ifp);
2150         }
2151 }
2152
2153 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2154 {
2155         struct inet6_ifaddr * ifp;
2156
2157         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2158         if (!IS_ERR(ifp)) {
2159                 addrconf_dad_start(ifp, 0);
2160                 in6_ifa_put(ifp);
2161         }
2162 }
2163
2164 static void addrconf_dev_config(struct net_device *dev)
2165 {
2166         struct in6_addr addr;
2167         struct inet6_dev    * idev;
2168
2169         ASSERT_RTNL();
2170
2171         if ((dev->type != ARPHRD_ETHER) &&
2172             (dev->type != ARPHRD_FDDI) &&
2173             (dev->type != ARPHRD_IEEE802_TR) &&
2174             (dev->type != ARPHRD_ARCNET) &&
2175             (dev->type != ARPHRD_INFINIBAND)) {
2176                 /* Alas, we support only Ethernet autoconfiguration. */
2177                 return;
2178         }
2179
2180         idev = addrconf_add_dev(dev);
2181         if (idev == NULL)
2182                 return;
2183
2184         memset(&addr, 0, sizeof(struct in6_addr));
2185         addr.s6_addr32[0] = htonl(0xFE800000);
2186
2187         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2188                 addrconf_add_linklocal(idev, &addr);
2189 }
2190
2191 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2192 static void addrconf_sit_config(struct net_device *dev)
2193 {
2194         struct inet6_dev *idev;
2195
2196         ASSERT_RTNL();
2197
2198         /*
2199          * Configure the tunnel with one of our IPv4
2200          * addresses... we should configure all of
2201          * our v4 addrs in the tunnel
2202          */
2203
2204         if ((idev = ipv6_find_idev(dev)) == NULL) {
2205                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2206                 return;
2207         }
2208
2209         sit_add_v4_addrs(idev);
2210
2211         if (dev->flags&IFF_POINTOPOINT) {
2212                 addrconf_add_mroute(dev);
2213                 addrconf_add_lroute(dev);
2214         } else
2215                 sit_route_add(dev);
2216 }
2217 #endif
2218
2219 static inline int
2220 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2221 {
2222         struct in6_addr lladdr;
2223
2224         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2225                 addrconf_add_linklocal(idev, &lladdr);
2226                 return 0;
2227         }
2228         return -1;
2229 }
2230
2231 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2232 {
2233         struct net_device *link_dev;
2234
2235         /* first try to inherit the link-local address from the link device */
2236         if (idev->dev->iflink &&
2237             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2238                 if (!ipv6_inherit_linklocal(idev, link_dev))
2239                         return;
2240         }
2241         /* then try to inherit it from any device */
2242         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2243                 if (!ipv6_inherit_linklocal(idev, link_dev))
2244                         return;
2245         }
2246         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2247 }
2248
2249 /*
2250  * Autoconfigure tunnel with a link-local address so routing protocols,
2251  * DHCPv6, MLD etc. can be run over the virtual link
2252  */
2253
2254 static void addrconf_ip6_tnl_config(struct net_device *dev)
2255 {
2256         struct inet6_dev *idev;
2257
2258         ASSERT_RTNL();
2259
2260         if ((idev = addrconf_add_dev(dev)) == NULL) {
2261                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2262                 return;
2263         }
2264         ip6_tnl_add_linklocal(idev);
2265 }
2266
2267 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2268                            void * data)
2269 {
2270         struct net_device *dev = (struct net_device *) data;
2271         struct inet6_dev *idev = __in6_dev_get(dev);
2272         int run_pending = 0;
2273
2274         switch(event) {
2275         case NETDEV_UP:
2276         case NETDEV_CHANGE:
2277                 if (event == NETDEV_UP) {
2278                         if (!netif_carrier_ok(dev)) {
2279                                 /* device is not ready yet. */
2280                                 printk(KERN_INFO
2281                                         "ADDRCONF(NETDEV_UP): %s: "
2282                                         "link is not ready\n",
2283                                         dev->name);
2284                                 break;
2285                         }
2286
2287                         if (idev)
2288                                 idev->if_flags |= IF_READY;
2289                 } else {
2290                         if (!netif_carrier_ok(dev)) {
2291                                 /* device is still not ready. */
2292                                 break;
2293                         }
2294
2295                         if (idev) {
2296                                 if (idev->if_flags & IF_READY) {
2297                                         /* device is already configured. */
2298                                         break;
2299                                 }
2300                                 idev->if_flags |= IF_READY;
2301                         }
2302
2303                         printk(KERN_INFO
2304                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2305                                         "link becomes ready\n",
2306                                         dev->name);
2307
2308                         run_pending = 1;
2309                 }
2310
2311                 switch(dev->type) {
2312 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2313                 case ARPHRD_SIT:
2314                         addrconf_sit_config(dev);
2315                         break;
2316 #endif
2317                 case ARPHRD_TUNNEL6:
2318                         addrconf_ip6_tnl_config(dev);
2319                         break;
2320                 case ARPHRD_LOOPBACK:
2321                         init_loopback(dev);
2322                         break;
2323
2324                 default:
2325                         addrconf_dev_config(dev);
2326                         break;
2327                 };
2328                 if (idev) {
2329                         if (run_pending)
2330                                 addrconf_dad_run(idev);
2331
2332                         /* If the MTU changed during the interface down, when the
2333                            interface up, the changed MTU must be reflected in the
2334                            idev as well as routers.
2335                          */
2336                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2337                                 rt6_mtu_change(dev, dev->mtu);
2338                                 idev->cnf.mtu6 = dev->mtu;
2339                         }
2340                         idev->tstamp = jiffies;
2341                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2342                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2343                            stop IPv6 on this interface.
2344                          */
2345                         if (dev->mtu < IPV6_MIN_MTU)
2346                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2347                 }
2348                 break;
2349
2350         case NETDEV_CHANGEMTU:
2351                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2352                         rt6_mtu_change(dev, dev->mtu);
2353                         idev->cnf.mtu6 = dev->mtu;
2354                         break;
2355                 }
2356
2357                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2358
2359         case NETDEV_DOWN:
2360         case NETDEV_UNREGISTER:
2361                 /*
2362                  *      Remove all addresses from this interface.
2363                  */
2364                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2365                 break;
2366
2367         case NETDEV_CHANGENAME:
2368 #ifdef CONFIG_SYSCTL
2369                 if (idev) {
2370                         addrconf_sysctl_unregister(&idev->cnf);
2371                         neigh_sysctl_unregister(idev->nd_parms);
2372                         neigh_sysctl_register(dev, idev->nd_parms,
2373                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2374                                               &ndisc_ifinfo_sysctl_change,
2375                                               NULL);
2376                         addrconf_sysctl_register(idev, &idev->cnf);
2377                 }
2378 #endif
2379                 break;
2380         };
2381
2382         return NOTIFY_OK;
2383 }
2384
2385 /*
2386  *      addrconf module should be notified of a device going up
2387  */
2388 static struct notifier_block ipv6_dev_notf = {
2389         .notifier_call = addrconf_notify,
2390         .priority = 0
2391 };
2392
2393 static int addrconf_ifdown(struct net_device *dev, int how)
2394 {
2395         struct inet6_dev *idev;
2396         struct inet6_ifaddr *ifa, **bifa;
2397         int i;
2398
2399         ASSERT_RTNL();
2400
2401         if (dev == &loopback_dev && how == 1)
2402                 how = 0;
2403
2404         rt6_ifdown(dev);
2405         neigh_ifdown(&nd_tbl, dev);
2406
2407         idev = __in6_dev_get(dev);
2408         if (idev == NULL)
2409                 return -ENODEV;
2410
2411         /* Step 1: remove reference to ipv6 device from parent device.
2412                    Do not dev_put!
2413          */
2414         if (how == 1) {
2415                 idev->dead = 1;
2416
2417                 /* protected by rtnl_lock */
2418                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2419
2420                 /* Step 1.5: remove snmp6 entry */
2421                 snmp6_unregister_dev(idev);
2422
2423         }
2424
2425         /* Step 2: clear hash table */
2426         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2427                 bifa = &inet6_addr_lst[i];
2428
2429                 write_lock_bh(&addrconf_hash_lock);
2430                 while ((ifa = *bifa) != NULL) {
2431                         if (ifa->idev == idev) {
2432                                 *bifa = ifa->lst_next;
2433                                 ifa->lst_next = NULL;
2434                                 addrconf_del_timer(ifa);
2435                                 in6_ifa_put(ifa);
2436                                 continue;
2437                         }
2438                         bifa = &ifa->lst_next;
2439                 }
2440                 write_unlock_bh(&addrconf_hash_lock);
2441         }
2442
2443         write_lock_bh(&idev->lock);
2444
2445         /* Step 3: clear flags for stateless addrconf */
2446         if (how != 1)
2447                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2448
2449         /* Step 4: clear address list */
2450 #ifdef CONFIG_IPV6_PRIVACY
2451         if (how == 1 && del_timer(&idev->regen_timer))
2452                 in6_dev_put(idev);
2453
2454         /* clear tempaddr list */
2455         while ((ifa = idev->tempaddr_list) != NULL) {
2456                 idev->tempaddr_list = ifa->tmp_next;
2457                 ifa->tmp_next = NULL;
2458                 ifa->dead = 1;
2459                 write_unlock_bh(&idev->lock);
2460                 spin_lock_bh(&ifa->lock);
2461
2462                 if (ifa->ifpub) {
2463                         in6_ifa_put(ifa->ifpub);
2464                         ifa->ifpub = NULL;
2465                 }
2466                 spin_unlock_bh(&ifa->lock);
2467                 in6_ifa_put(ifa);
2468                 write_lock_bh(&idev->lock);
2469         }
2470 #endif
2471         while ((ifa = idev->addr_list) != NULL) {
2472                 idev->addr_list = ifa->if_next;
2473                 ifa->if_next = NULL;
2474                 ifa->dead = 1;
2475                 addrconf_del_timer(ifa);
2476                 write_unlock_bh(&idev->lock);
2477
2478                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2479                 in6_ifa_put(ifa);
2480
2481                 write_lock_bh(&idev->lock);
2482         }
2483         write_unlock_bh(&idev->lock);
2484
2485         /* Step 5: Discard multicast list */
2486
2487         if (how == 1)
2488                 ipv6_mc_destroy_dev(idev);
2489         else
2490                 ipv6_mc_down(idev);
2491
2492         /* Step 5: netlink notification of this interface */
2493         idev->tstamp = jiffies;
2494         inet6_ifinfo_notify(RTM_DELLINK, idev);
2495
2496         /* Shot the device (if unregistered) */
2497
2498         if (how == 1) {
2499 #ifdef CONFIG_SYSCTL
2500                 addrconf_sysctl_unregister(&idev->cnf);
2501                 neigh_sysctl_unregister(idev->nd_parms);
2502 #endif
2503                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2504                 neigh_ifdown(&nd_tbl, dev);
2505                 in6_dev_put(idev);
2506         }
2507         return 0;
2508 }
2509
2510 static void addrconf_rs_timer(unsigned long data)
2511 {
2512         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2513
2514         if (ifp->idev->cnf.forwarding)
2515                 goto out;
2516
2517         if (ifp->idev->if_flags & IF_RA_RCVD) {
2518                 /*
2519                  *      Announcement received after solicitation
2520                  *      was sent
2521                  */
2522                 goto out;
2523         }
2524
2525         spin_lock(&ifp->lock);
2526         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2527                 struct in6_addr all_routers;
2528
2529                 /* The wait after the last probe can be shorter */
2530                 addrconf_mod_timer(ifp, AC_RS,
2531                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2532                                    ifp->idev->cnf.rtr_solicit_delay :
2533                                    ifp->idev->cnf.rtr_solicit_interval);
2534                 spin_unlock(&ifp->lock);
2535
2536                 ipv6_addr_all_routers(&all_routers);
2537
2538                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2539         } else {
2540                 spin_unlock(&ifp->lock);
2541                 /*
2542                  * Note: we do not support deprecated "all on-link"
2543                  * assumption any longer.
2544                  */
2545                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2546                        ifp->idev->dev->name);
2547         }
2548
2549 out:
2550         in6_ifa_put(ifp);
2551 }
2552
2553 /*
2554  *      Duplicate Address Detection
2555  */
2556 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2557 {
2558         unsigned long rand_num;
2559         struct inet6_dev *idev = ifp->idev;
2560
2561         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2562         ifp->probes = idev->cnf.dad_transmits;
2563         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2564 }
2565
2566 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2567 {
2568         struct inet6_dev *idev = ifp->idev;
2569         struct net_device *dev = idev->dev;
2570
2571         addrconf_join_solict(dev, &ifp->addr);
2572
2573         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2574                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2575                                         flags);
2576
2577         net_srandom(ifp->addr.s6_addr32[3]);
2578
2579         read_lock_bh(&idev->lock);
2580         if (ifp->dead)
2581                 goto out;
2582         spin_lock_bh(&ifp->lock);
2583
2584         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2585
2586             !(dev->flags&IFF_MULTICAST) ||
2587             !(ifp->flags&IFA_F_TENTATIVE) ||
2588             ifp->flags & IFA_F_NODAD) {
2589                 ifp->flags &= ~IFA_F_TENTATIVE;
2590                 spin_unlock_bh(&ifp->lock);
2591                 read_unlock_bh(&idev->lock);
2592
2593                 addrconf_dad_completed(ifp);
2594                 return;
2595         }
2596
2597         if (!(idev->if_flags & IF_READY)) {
2598                 spin_unlock_bh(&ifp->lock);
2599                 read_unlock_bh(&idev->lock);
2600                 /*
2601                  * If the defice is not ready:
2602                  * - keep it tentative if it is a permanent address.
2603                  * - otherwise, kill it.
2604                  */
2605                 in6_ifa_hold(ifp);
2606                 addrconf_dad_stop(ifp);
2607                 return;
2608         }
2609         addrconf_dad_kick(ifp);
2610         spin_unlock_bh(&ifp->lock);
2611 out:
2612         read_unlock_bh(&idev->lock);
2613 }
2614
2615 static void addrconf_dad_timer(unsigned long data)
2616 {
2617         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2618         struct inet6_dev *idev = ifp->idev;
2619         struct in6_addr unspec;
2620         struct in6_addr mcaddr;
2621
2622         read_lock_bh(&idev->lock);
2623         if (idev->dead) {
2624                 read_unlock_bh(&idev->lock);
2625                 goto out;
2626         }
2627         spin_lock_bh(&ifp->lock);
2628         if (ifp->probes == 0) {
2629                 /*
2630                  * DAD was successful
2631                  */
2632
2633                 ifp->flags &= ~IFA_F_TENTATIVE;
2634                 spin_unlock_bh(&ifp->lock);
2635                 read_unlock_bh(&idev->lock);
2636
2637                 addrconf_dad_completed(ifp);
2638
2639                 goto out;
2640         }
2641
2642         ifp->probes--;
2643         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2644         spin_unlock_bh(&ifp->lock);
2645         read_unlock_bh(&idev->lock);
2646
2647         /* send a neighbour solicitation for our addr */
2648         memset(&unspec, 0, sizeof(unspec));
2649         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2650         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2651 out:
2652         in6_ifa_put(ifp);
2653 }
2654
2655 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2656 {
2657         struct net_device *     dev = ifp->idev->dev;
2658
2659         /*
2660          *      Configure the address for reception. Now it is valid.
2661          */
2662
2663         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2664
2665         /* If added prefix is link local and forwarding is off,
2666            start sending router solicitations.
2667          */
2668
2669         if (ifp->idev->cnf.forwarding == 0 &&
2670             ifp->idev->cnf.rtr_solicits > 0 &&
2671             (dev->flags&IFF_LOOPBACK) == 0 &&
2672             (dev->flags & IFF_MULTICAST) &&
2673             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2674                 struct in6_addr all_routers;
2675
2676                 ipv6_addr_all_routers(&all_routers);
2677
2678                 /*
2679                  *      If a host as already performed a random delay
2680                  *      [...] as part of DAD [...] there is no need
2681                  *      to delay again before sending the first RS
2682                  */
2683                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2684
2685                 spin_lock_bh(&ifp->lock);
2686                 ifp->probes = 1;
2687                 ifp->idev->if_flags |= IF_RS_SENT;
2688                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2689                 spin_unlock_bh(&ifp->lock);
2690         }
2691 }
2692
2693 static void addrconf_dad_run(struct inet6_dev *idev) {
2694         struct inet6_ifaddr *ifp;
2695
2696         read_lock_bh(&idev->lock);
2697         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2698                 spin_lock_bh(&ifp->lock);
2699                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2700                         spin_unlock_bh(&ifp->lock);
2701                         continue;
2702                 }
2703                 spin_unlock_bh(&ifp->lock);
2704                 addrconf_dad_kick(ifp);
2705         }
2706         read_unlock_bh(&idev->lock);
2707 }
2708
2709 #ifdef CONFIG_PROC_FS
2710 struct if6_iter_state {
2711         int bucket;
2712 };
2713
2714 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2715 {
2716         struct inet6_ifaddr *ifa = NULL;
2717         struct if6_iter_state *state = seq->private;
2718
2719         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2720                 ifa = inet6_addr_lst[state->bucket];
2721                 if (ifa)
2722                         break;
2723         }
2724         return ifa;
2725 }
2726
2727 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2728 {
2729         struct if6_iter_state *state = seq->private;
2730
2731         ifa = ifa->lst_next;
2732 try_again:
2733         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2734                 ifa = inet6_addr_lst[state->bucket];
2735                 goto try_again;
2736         }
2737         return ifa;
2738 }
2739
2740 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2741 {
2742         struct inet6_ifaddr *ifa = if6_get_first(seq);
2743
2744         if (ifa)
2745                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2746                         --pos;
2747         return pos ? NULL : ifa;
2748 }
2749
2750 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2751 {
2752         read_lock_bh(&addrconf_hash_lock);
2753         return if6_get_idx(seq, *pos);
2754 }
2755
2756 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2757 {
2758         struct inet6_ifaddr *ifa;
2759
2760         ifa = if6_get_next(seq, v);
2761         ++*pos;
2762         return ifa;
2763 }
2764
2765 static void if6_seq_stop(struct seq_file *seq, void *v)
2766 {
2767         read_unlock_bh(&addrconf_hash_lock);
2768 }
2769
2770 static int if6_seq_show(struct seq_file *seq, void *v)
2771 {
2772         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2773
2774         /* Only addresses visible to vserver context */
2775         if (nx_check(0, VS_ADMIN|VS_WATCH) ||
2776                 addr6_in_nx_info(current_nx_info(), &ifp->addr))
2777                 seq_printf(seq,
2778                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2779                    NIP6(ifp->addr),
2780                    ifp->idev->dev->ifindex,
2781                    ifp->prefix_len,
2782                    ifp->scope,
2783                    ifp->flags,
2784                    ifp->idev->dev->name);
2785         return 0;
2786 }
2787
2788 static struct seq_operations if6_seq_ops = {
2789         .start  = if6_seq_start,
2790         .next   = if6_seq_next,
2791         .show   = if6_seq_show,
2792         .stop   = if6_seq_stop,
2793 };
2794
2795 static int if6_seq_open(struct inode *inode, struct file *file)
2796 {
2797         struct seq_file *seq;
2798         int rc = -ENOMEM;
2799         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2800
2801         if (!s)
2802                 goto out;
2803
2804         rc = seq_open(file, &if6_seq_ops);
2805         if (rc)
2806                 goto out_kfree;
2807
2808         seq = file->private_data;
2809         seq->private = s;
2810 out:
2811         return rc;
2812 out_kfree:
2813         kfree(s);
2814         goto out;
2815 }
2816
2817 static struct file_operations if6_fops = {
2818         .owner          = THIS_MODULE,
2819         .open           = if6_seq_open,
2820         .read           = seq_read,
2821         .llseek         = seq_lseek,
2822         .release        = seq_release_private,
2823 };
2824
2825 int __init if6_proc_init(void)
2826 {
2827         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2828                 return -ENOMEM;
2829         return 0;
2830 }
2831
2832 void if6_proc_exit(void)
2833 {
2834         proc_net_remove("if_inet6");
2835 }
2836 #endif  /* CONFIG_PROC_FS */
2837
2838 #ifdef CONFIG_IPV6_MIP6
2839 /* Check if address is a home address configured on any interface. */
2840 int ipv6_chk_home_addr(struct in6_addr *addr)
2841 {
2842         int ret = 0;
2843         struct inet6_ifaddr * ifp;
2844         u8 hash = ipv6_addr_hash(addr);
2845         read_lock_bh(&addrconf_hash_lock);
2846         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2847                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2848                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2849                         ret = 1;
2850                         break;
2851                 }
2852         }
2853         read_unlock_bh(&addrconf_hash_lock);
2854         return ret;
2855 }
2856 #endif
2857
2858 /*
2859  *      Periodic address status verification
2860  */
2861
2862 static void addrconf_verify(unsigned long foo)
2863 {
2864         struct inet6_ifaddr *ifp;
2865         unsigned long now, next;
2866         int i;
2867
2868         spin_lock_bh(&addrconf_verify_lock);
2869         now = jiffies;
2870         next = now + ADDR_CHECK_FREQUENCY;
2871
2872         del_timer(&addr_chk_timer);
2873
2874         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2875
2876 restart:
2877                 read_lock(&addrconf_hash_lock);
2878                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2879                         unsigned long age;
2880 #ifdef CONFIG_IPV6_PRIVACY
2881                         unsigned long regen_advance;
2882 #endif
2883
2884                         if (ifp->flags & IFA_F_PERMANENT)
2885                                 continue;
2886
2887                         spin_lock(&ifp->lock);
2888                         age = (now - ifp->tstamp) / HZ;
2889
2890 #ifdef CONFIG_IPV6_PRIVACY
2891                         regen_advance = ifp->idev->cnf.regen_max_retry *
2892                                         ifp->idev->cnf.dad_transmits *
2893                                         ifp->idev->nd_parms->retrans_time / HZ;
2894 #endif
2895
2896                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2897                             age >= ifp->valid_lft) {
2898                                 spin_unlock(&ifp->lock);
2899                                 in6_ifa_hold(ifp);
2900                                 read_unlock(&addrconf_hash_lock);
2901                                 ipv6_del_addr(ifp);
2902                                 goto restart;
2903                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2904                                 spin_unlock(&ifp->lock);
2905                                 continue;
2906                         } else if (age >= ifp->prefered_lft) {
2907                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2908                                 int deprecate = 0;
2909
2910                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2911                                         deprecate = 1;
2912                                         ifp->flags |= IFA_F_DEPRECATED;
2913                                 }
2914
2915                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2916                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2917
2918                                 spin_unlock(&ifp->lock);
2919
2920                                 if (deprecate) {
2921                                         in6_ifa_hold(ifp);
2922                                         read_unlock(&addrconf_hash_lock);
2923
2924                                         ipv6_ifa_notify(0, ifp);
2925                                         in6_ifa_put(ifp);
2926                                         goto restart;
2927                                 }
2928 #ifdef CONFIG_IPV6_PRIVACY
2929                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2930                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2931                                 if (age >= ifp->prefered_lft - regen_advance) {
2932                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2933                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2934                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2935                                         if (!ifp->regen_count && ifpub) {
2936                                                 ifp->regen_count++;
2937                                                 in6_ifa_hold(ifp);
2938                                                 in6_ifa_hold(ifpub);
2939                                                 spin_unlock(&ifp->lock);
2940                                                 read_unlock(&addrconf_hash_lock);
2941                                                 spin_lock(&ifpub->lock);
2942                                                 ifpub->regen_count = 0;
2943                                                 spin_unlock(&ifpub->lock);
2944                                                 ipv6_create_tempaddr(ifpub, ifp);
2945                                                 in6_ifa_put(ifpub);
2946                                                 in6_ifa_put(ifp);
2947                                                 goto restart;
2948                                         }
2949                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2950                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2951                                 spin_unlock(&ifp->lock);
2952 #endif
2953                         } else {
2954                                 /* ifp->prefered_lft <= ifp->valid_lft */
2955                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2956                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2957                                 spin_unlock(&ifp->lock);
2958                         }
2959                 }
2960                 read_unlock(&addrconf_hash_lock);
2961         }
2962
2963         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2964         add_timer(&addr_chk_timer);
2965         spin_unlock_bh(&addrconf_verify_lock);
2966 }
2967
2968 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2969 {
2970         struct in6_addr *pfx = NULL;
2971
2972         if (addr)
2973                 pfx = nla_data(addr);
2974
2975         if (local) {
2976                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2977                         pfx = NULL;
2978                 else
2979                         pfx = nla_data(local);
2980         }
2981
2982         return pfx;
2983 }
2984
2985 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2986         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2987         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2988         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2989 };
2990
2991 static int
2992 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2993 {
2994         struct ifaddrmsg *ifm;
2995         struct nlattr *tb[IFA_MAX+1];
2996         struct in6_addr *pfx;
2997         int err;
2998
2999         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3000         if (err < 0)
3001                 return err;
3002
3003         ifm = nlmsg_data(nlh);
3004         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3005         if (pfx == NULL)
3006                 return -EINVAL;
3007
3008         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3009 }
3010
3011 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3012                              u32 prefered_lft, u32 valid_lft)
3013 {
3014         if (!valid_lft || (prefered_lft > valid_lft))
3015                 return -EINVAL;
3016
3017         if (valid_lft == INFINITY_LIFE_TIME)
3018                 ifa_flags |= IFA_F_PERMANENT;
3019         else if (valid_lft >= 0x7FFFFFFF/HZ)
3020                 valid_lft = 0x7FFFFFFF/HZ;
3021
3022         if (prefered_lft == 0)
3023                 ifa_flags |= IFA_F_DEPRECATED;
3024         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3025                  (prefered_lft != INFINITY_LIFE_TIME))
3026                 prefered_lft = 0x7FFFFFFF/HZ;
3027
3028         spin_lock_bh(&ifp->lock);
3029         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3030         ifp->tstamp = jiffies;
3031         ifp->valid_lft = valid_lft;
3032         ifp->prefered_lft = prefered_lft;
3033
3034         spin_unlock_bh(&ifp->lock);
3035         if (!(ifp->flags&IFA_F_TENTATIVE))
3036                 ipv6_ifa_notify(0, ifp);
3037
3038         addrconf_verify(0);
3039
3040         return 0;
3041 }
3042
3043 static int
3044 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3045 {
3046         struct ifaddrmsg *ifm;
3047         struct nlattr *tb[IFA_MAX+1];
3048         struct in6_addr *pfx;
3049         struct inet6_ifaddr *ifa;
3050         struct net_device *dev;
3051         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3052         u8 ifa_flags;
3053         int err;
3054
3055         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3056         if (err < 0)
3057                 return err;
3058
3059         ifm = nlmsg_data(nlh);
3060         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3061         if (pfx == NULL)
3062                 return -EINVAL;
3063
3064         if (tb[IFA_CACHEINFO]) {
3065                 struct ifa_cacheinfo *ci;
3066
3067                 ci = nla_data(tb[IFA_CACHEINFO]);
3068                 valid_lft = ci->ifa_valid;
3069                 preferred_lft = ci->ifa_prefered;
3070         } else {
3071                 preferred_lft = INFINITY_LIFE_TIME;
3072                 valid_lft = INFINITY_LIFE_TIME;
3073         }
3074
3075         dev =  __dev_get_by_index(ifm->ifa_index);
3076         if (dev == NULL)
3077                 return -ENODEV;
3078
3079         /* We ignore other flags so far. */
3080         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3081
3082         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3083         if (ifa == NULL) {
3084                 /*
3085                  * It would be best to check for !NLM_F_CREATE here but
3086                  * userspace alreay relies on not having to provide this.
3087                  */
3088                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3089                                       ifa_flags, preferred_lft, valid_lft);
3090         }
3091
3092         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3093             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3094                 err = -EEXIST;
3095         else
3096                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3097
3098         in6_ifa_put(ifa);
3099
3100         return err;
3101 }
3102
3103 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3104                           u8 scope, int ifindex)
3105 {
3106         struct ifaddrmsg *ifm;
3107
3108         ifm = nlmsg_data(nlh);
3109         ifm->ifa_family = AF_INET6;
3110         ifm->ifa_prefixlen = prefixlen;
3111         ifm->ifa_flags = flags;
3112         ifm->ifa_scope = scope;
3113         ifm->ifa_index = ifindex;
3114 }
3115
3116 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3117                          unsigned long tstamp, u32 preferred, u32 valid)
3118 {
3119         struct ifa_cacheinfo ci;
3120
3121         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3122                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3123         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3124                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3125         ci.ifa_prefered = preferred;
3126         ci.ifa_valid = valid;
3127
3128         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3129 }
3130
3131 static inline int rt_scope(int ifa_scope)
3132 {
3133         if (ifa_scope & IFA_HOST)
3134                 return RT_SCOPE_HOST;
3135         else if (ifa_scope & IFA_LINK)
3136                 return RT_SCOPE_LINK;
3137         else if (ifa_scope & IFA_SITE)
3138                 return RT_SCOPE_SITE;
3139         else
3140                 return RT_SCOPE_UNIVERSE;
3141 }
3142
3143 static inline int inet6_ifaddr_msgsize(void)
3144 {
3145         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3146                + nla_total_size(16) /* IFA_ADDRESS */
3147                + nla_total_size(sizeof(struct ifa_cacheinfo));
3148 }
3149
3150 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3151                              u32 pid, u32 seq, int event, unsigned int flags)
3152 {
3153         struct nlmsghdr  *nlh;
3154         u32 preferred, valid;
3155
3156         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3157         if (nlh == NULL)
3158                 return -ENOBUFS;
3159
3160         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3161                       ifa->idev->dev->ifindex);
3162
3163         if (!(ifa->flags&IFA_F_PERMANENT)) {
3164                 preferred = ifa->prefered_lft;
3165                 valid = ifa->valid_lft;
3166                 if (preferred != INFINITY_LIFE_TIME) {
3167                         long tval = (jiffies - ifa->tstamp)/HZ;
3168                         preferred -= tval;
3169                         if (valid != INFINITY_LIFE_TIME)
3170                                 valid -= tval;
3171                 }
3172         } else {
3173                 preferred = INFINITY_LIFE_TIME;
3174                 valid = INFINITY_LIFE_TIME;
3175         }
3176
3177         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3178             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3179                 return nlmsg_cancel(skb, nlh);
3180
3181         return nlmsg_end(skb, nlh);
3182 }
3183
3184 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3185                                 u32 pid, u32 seq, int event, u16 flags)
3186 {
3187         struct nlmsghdr  *nlh;
3188         u8 scope = RT_SCOPE_UNIVERSE;
3189         int ifindex = ifmca->idev->dev->ifindex;
3190
3191         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3192                 scope = RT_SCOPE_SITE;
3193
3194         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3195         if (nlh == NULL)
3196                 return -ENOBUFS;
3197
3198         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3199         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3200             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3201                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0)
3202                 return nlmsg_cancel(skb, nlh);
3203
3204         return nlmsg_end(skb, nlh);
3205 }
3206
3207 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3208                                 u32 pid, u32 seq, int event, unsigned int flags)
3209 {
3210         struct nlmsghdr  *nlh;
3211         u8 scope = RT_SCOPE_UNIVERSE;
3212         int ifindex = ifaca->aca_idev->dev->ifindex;
3213
3214         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3215                 scope = RT_SCOPE_SITE;
3216
3217         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3218         if (nlh == NULL)
3219                 return -ENOBUFS;
3220
3221         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3222         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3223             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3224                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0)
3225                 return nlmsg_cancel(skb, nlh);
3226
3227         return nlmsg_end(skb, nlh);
3228 }
3229
3230 enum addr_type_t
3231 {
3232         UNICAST_ADDR,
3233         MULTICAST_ADDR,
3234         ANYCAST_ADDR,
3235 };
3236
3237 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3238                            enum addr_type_t type)
3239 {
3240         int idx, ip_idx;
3241         int s_idx, s_ip_idx;
3242         int err = 1;
3243         struct net_device *dev;
3244         struct inet6_dev *idev = NULL;
3245         struct inet6_ifaddr *ifa;
3246         struct ifmcaddr6 *ifmca;
3247         struct ifacaddr6 *ifaca;
3248
3249         /* no ipv6 inside a vserver if no addr set */
3250         if (skb->sk && skb->sk->sk_nx_info && skb->sk->sk_nx_info->nbipv6 == 0)
3251                 return skb->len;
3252
3253         s_idx = cb->args[0];
3254         s_ip_idx = ip_idx = cb->args[1];
3255         read_lock(&dev_base_lock);
3256
3257         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3258                 if (idx < s_idx)
3259                         continue;
3260                 if (idx > s_idx)
3261                         s_ip_idx = 0;
3262                 ip_idx = 0;
3263                 if ((idev = in6_dev_get(dev)) == NULL)
3264                         continue;
3265                 read_lock_bh(&idev->lock);
3266                 switch (type) {
3267                 case UNICAST_ADDR:
3268                         /* unicast address incl. temp addr */
3269                         for (ifa = idev->addr_list; ifa;
3270                              ifa = ifa->if_next, ip_idx++) {
3271                                 if (ip_idx < s_ip_idx)
3272                                         continue;
3273                                 if (skb->sk && skb->sk->sk_nx_info && !addr6_in_nx_info(skb->sk->sk_nx_info, &ifa->addr))
3274                                         continue; /* Skip addresses not in nx */
3275                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3276                                     NETLINK_CB(cb->skb).pid,
3277                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3278                                     NLM_F_MULTI)) <= 0)
3279                                         goto done;
3280                         }
3281                         break;
3282                 case MULTICAST_ADDR:
3283                         /* multicast address */
3284                         for (ifmca = idev->mc_list; ifmca;
3285                              ifmca = ifmca->next, ip_idx++) {
3286                                 if (ip_idx < s_ip_idx)
3287                                         continue;
3288                                 if (skb->sk && skb->sk->sk_nx_info && !addr6_in_nx_info(skb->sk->sk_nx_info, &ifmca->mca_addr))
3289                                         continue; /* Skip addresses not in nx */
3290                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3291                                     NETLINK_CB(cb->skb).pid,
3292                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3293                                     NLM_F_MULTI)) <= 0)
3294                                         goto done;
3295                         }
3296                         break;
3297                 case ANYCAST_ADDR:
3298                         /* anycast address */
3299                         for (ifaca = idev->ac_list; ifaca;
3300                              ifaca = ifaca->aca_next, ip_idx++) {
3301                                 if (ip_idx < s_ip_idx)
3302                                         continue;
3303                                 if (skb->sk && skb->sk->sk_nx_info && !addr6_in_nx_info(skb->sk->sk_nx_info, &ifaca->aca_addr))
3304                                         continue; /* Skip addresses not in nx */
3305                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3306                                     NETLINK_CB(cb->skb).pid,
3307                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3308                                     NLM_F_MULTI)) <= 0)
3309                                         goto done;
3310                         }
3311                         break;
3312                 default:
3313                         break;
3314                 }
3315                 read_unlock_bh(&idev->lock);
3316                 in6_dev_put(idev);
3317         }
3318 done:
3319         if (err <= 0) {
3320                 read_unlock_bh(&idev->lock);
3321                 in6_dev_put(idev);
3322         }
3323         read_unlock(&dev_base_lock);
3324         cb->args[0] = idx;
3325         cb->args[1] = ip_idx;
3326         return skb->len;
3327 }
3328
3329 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3330 {
3331         enum addr_type_t type = UNICAST_ADDR;
3332         return inet6_dump_addr(skb, cb, type);
3333 }
3334
3335 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3336 {
3337         enum addr_type_t type = MULTICAST_ADDR;
3338         return inet6_dump_addr(skb, cb, type);
3339 }
3340
3341
3342 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3343 {
3344         enum addr_type_t type = ANYCAST_ADDR;
3345         return inet6_dump_addr(skb, cb, type);
3346 }
3347
3348 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3349                              void *arg)
3350 {
3351         struct ifaddrmsg *ifm;
3352         struct nlattr *tb[IFA_MAX+1];
3353         struct in6_addr *addr = NULL;
3354         struct net_device *dev = NULL;
3355         struct inet6_ifaddr *ifa;
3356         struct sk_buff *skb;
3357         int err;
3358
3359         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3360         if (err < 0)
3361                 goto errout;
3362
3363         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3364         if (addr == NULL) {
3365                 err = -EINVAL;
3366                 goto errout;
3367         }
3368
3369         ifm = nlmsg_data(nlh);
3370         if (ifm->ifa_index)
3371                 dev = __dev_get_by_index(ifm->ifa_index);
3372
3373         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3374                 err = -EADDRNOTAVAIL;
3375                 goto errout;
3376         }
3377
3378         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3379                 err = -ENOBUFS;
3380                 goto errout_ifa;
3381         }
3382
3383         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3384                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3385         /* failure implies BUG in inet6_ifaddr_msgsize() */
3386         BUG_ON(err < 0);
3387
3388         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3389 errout_ifa:
3390         in6_ifa_put(ifa);
3391 errout:
3392         return err;
3393 }
3394
3395 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3396 {
3397         struct sk_buff *skb;
3398         int err = -ENOBUFS;
3399
3400         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3401         if (skb == NULL)
3402                 goto errout;
3403
3404         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3405         /* failure implies BUG in inet6_ifaddr_msgsize() */
3406         BUG_ON(err < 0);
3407
3408         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3409 errout:
3410         if (err < 0)
3411                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3412 }
3413
3414 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3415                                 __s32 *array, int bytes)
3416 {
3417         BUG_ON(bytes < (DEVCONF_MAX * 4));
3418
3419         memset(array, 0, bytes);
3420         array[DEVCONF_FORWARDING] = cnf->forwarding;
3421         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3422         array[DEVCONF_MTU6] = cnf->mtu6;
3423         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3424         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3425         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3426         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3427         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3428         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3429         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3430         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3431 #ifdef CONFIG_IPV6_PRIVACY
3432         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3433         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3434         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3435         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3436         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3437 #endif
3438         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3439         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3440         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3441 #ifdef CONFIG_IPV6_ROUTER_PREF
3442         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3443         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3444 #ifdef CONFIG_IPV6_ROUTE_INFO
3445         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3446 #endif
3447 #endif
3448         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3449         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3450 }
3451
3452 static inline size_t inet6_if_nlmsg_size(void)
3453 {
3454         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3455                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3456                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3457                + nla_total_size(4) /* IFLA_MTU */
3458                + nla_total_size(4) /* IFLA_LINK */
3459                + nla_total_size( /* IFLA_PROTINFO */
3460                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3461                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3462                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3463                  );
3464 }
3465
3466 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3467                              u32 pid, u32 seq, int event, unsigned int flags)
3468 {
3469         struct net_device *dev = idev->dev;
3470         struct nlattr *conf;
3471         struct ifinfomsg *hdr;
3472         struct nlmsghdr *nlh;
3473         void *protoinfo;
3474         struct ifla_cacheinfo ci;
3475
3476         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3477         if (nlh == NULL)
3478                 return -ENOBUFS;
3479
3480         hdr = nlmsg_data(nlh);
3481         hdr->ifi_family = AF_INET6;
3482         hdr->__ifi_pad = 0;
3483         hdr->ifi_type = dev->type;
3484         hdr->ifi_index = dev->ifindex;
3485         hdr->ifi_flags = dev_get_flags(dev);
3486         hdr->ifi_change = 0;
3487
3488         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3489
3490         if (dev->addr_len)
3491                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3492
3493         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3494         if (dev->ifindex != dev->iflink)
3495                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3496
3497         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3498         if (protoinfo == NULL)
3499                 goto nla_put_failure;
3500
3501         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3502
3503         ci.max_reasm_len = IPV6_MAXPLEN;
3504         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3505                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3506         ci.reachable_time = idev->nd_parms->reachable_time;
3507         ci.retrans_time = idev->nd_parms->retrans_time;
3508         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3509
3510         conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3511         if (conf == NULL)
3512                 goto nla_put_failure;
3513         ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
3514
3515         /* XXX - Statistics/MC not implemented */
3516
3517         nla_nest_end(skb, protoinfo);
3518         return nlmsg_end(skb, nlh);
3519
3520 nla_put_failure:
3521         return nlmsg_cancel(skb, nlh);
3522 }
3523
3524 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3525 {
3526         int idx, err;
3527         int s_idx = cb->args[0];
3528         struct net_device *dev;
3529         struct inet6_dev *idev;
3530
3531         /* no ipv6 inside a vserver if no addr set */
3532         if (skb->sk && skb->sk->sk_nx_info && skb->sk->sk_nx_info->nbipv6 == 0)
3533                 return skb->len;
3534
3535         read_lock(&dev_base_lock);
3536         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3537                 if (idx < s_idx)
3538                         continue;
3539                 if (skb->sk && skb->sk->sk_nx_info && !ipv6_dev_in_nx_info6(dev, skb->sk->sk_nx_info))
3540                         continue;
3541                 if ((idev = in6_dev_get(dev)) == NULL)
3542                         continue;
3543                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3544                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3545                 in6_dev_put(idev);
3546                 if (err <= 0)
3547                         break;
3548         }
3549         read_unlock(&dev_base_lock);
3550         cb->args[0] = idx;
3551
3552         return skb->len;
3553 }
3554
3555 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3556 {
3557         struct sk_buff *skb;
3558         int err = -ENOBUFS;
3559
3560         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3561         if (skb == NULL)
3562                 goto errout;
3563
3564         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3565         /* failure implies BUG in inet6_if_nlmsg_size() */
3566         BUG_ON(err < 0);
3567
3568         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3569 errout:
3570         if (err < 0)
3571                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3572 }
3573
3574 static inline size_t inet6_prefix_nlmsg_size(void)
3575 {
3576         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3577                + nla_total_size(sizeof(struct in6_addr))
3578                + nla_total_size(sizeof(struct prefix_cacheinfo));
3579 }
3580
3581 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3582                              struct prefix_info *pinfo, u32 pid, u32 seq,
3583                              int event, unsigned int flags)
3584 {
3585         struct prefixmsg *pmsg;
3586         struct nlmsghdr *nlh;
3587         struct prefix_cacheinfo ci;
3588
3589         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3590         if (nlh == NULL)
3591                 return -ENOBUFS;
3592
3593         pmsg = nlmsg_data(nlh);
3594         pmsg->prefix_family = AF_INET6;
3595         pmsg->prefix_pad1 = 0;
3596         pmsg->prefix_pad2 = 0;
3597         pmsg->prefix_ifindex = idev->dev->ifindex;
3598         pmsg->prefix_len = pinfo->prefix_len;
3599         pmsg->prefix_type = pinfo->type;
3600         pmsg->prefix_pad3 = 0;
3601         pmsg->prefix_flags = 0;
3602         if (pinfo->onlink)
3603                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3604         if (pinfo->autoconf)
3605                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3606
3607         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3608
3609         ci.preferred_time = ntohl(pinfo->prefered);
3610         ci.valid_time = ntohl(pinfo->valid);
3611         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3612
3613         return nlmsg_end(skb, nlh);
3614
3615 nla_put_failure:
3616         return nlmsg_cancel(skb, nlh);
3617 }
3618
3619 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3620                          struct prefix_info *pinfo)
3621 {
3622         struct sk_buff *skb;
3623         int err = -ENOBUFS;
3624
3625         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3626         if (skb == NULL)
3627                 goto errout;
3628
3629         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3630         /* failure implies BUG in inet6_prefix_nlmsg_size() */
3631         BUG_ON(err < 0);
3632
3633         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3634 errout:
3635         if (err < 0)
3636                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3637 }
3638
3639 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3640         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3641         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3642         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3643         [RTM_GETADDR - RTM_BASE] = { .doit      = inet6_rtm_getaddr,
3644                                      .dumpit    = inet6_dump_ifaddr, },
3645         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3646         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3647         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3648         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3649         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3650                                       .dumpit   = inet6_dump_fib, },
3651 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3652         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = fib6_rules_dump,   },
3653 #endif
3654 };
3655
3656 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3657 {
3658         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3659
3660         switch (event) {
3661         case RTM_NEWADDR:
3662                 ip6_ins_rt(ifp->rt);
3663                 if (ifp->idev->cnf.forwarding)
3664                         addrconf_join_anycast(ifp);
3665                 break;
3666         case RTM_DELADDR:
3667                 if (ifp->idev->cnf.forwarding)
3668                         addrconf_leave_anycast(ifp);
3669                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3670                 dst_hold(&ifp->rt->u.dst);
3671                 if (ip6_del_rt(ifp->rt))
3672                         dst_free(&ifp->rt->u.dst);
3673                 break;
3674         }
3675 }
3676
3677 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3678 {
3679         rcu_read_lock_bh();
3680         if (likely(ifp->idev->dead == 0))
3681                 __ipv6_ifa_notify(event, ifp);
3682         rcu_read_unlock_bh();
3683 }
3684
3685 #ifdef CONFIG_SYSCTL
3686
3687 static
3688 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3689                            void __user *buffer, size_t *lenp, loff_t *ppos)
3690 {
3691         int *valp = ctl->data;
3692         int val = *valp;
3693         int ret;
3694
3695         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3696
3697         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3698                 if (valp != &ipv6_devconf.forwarding) {
3699                         if ((!*valp) ^ (!val)) {
3700                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3701                                 if (idev == NULL)
3702                                         return ret;
3703                                 dev_forward_change(idev);
3704                         }
3705                 } else {
3706                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3707                         addrconf_forward_change();
3708                 }
3709                 if (*valp)
3710                         rt6_purge_dflt_routers();
3711         }
3712
3713         return ret;
3714 }
3715
3716 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3717                                             int __user *name, int nlen,
3718                                             void __user *oldval,
3719                                             size_t __user *oldlenp,
3720                                             void __user *newval, size_t newlen)
3721 {
3722         int *valp = table->data;
3723         int new;
3724
3725         if (!newval || !newlen)
3726                 return 0;
3727         if (newlen != sizeof(int))
3728                 return -EINVAL;
3729         if (get_user(new, (int __user *)newval))
3730                 return -EFAULT;
3731         if (new == *valp)
3732                 return 0;
3733         if (oldval && oldlenp) {
3734                 size_t len;
3735                 if (get_user(len, oldlenp))
3736                         return -EFAULT;
3737                 if (len) {
3738                         if (len > table->maxlen)
3739                                 len = table->maxlen;
3740                         if (copy_to_user(oldval, valp, len))
3741                                 return -EFAULT;
3742                         if (put_user(len, oldlenp))
3743                                 return -EFAULT;
3744                 }
3745         }
3746
3747         if (valp != &ipv6_devconf_dflt.forwarding) {
3748                 if (valp != &ipv6_devconf.forwarding) {
3749                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3750                         int changed;
3751                         if (unlikely(idev == NULL))
3752                                 return -ENODEV;
3753                         changed = (!*valp) ^ (!new);
3754                         *valp = new;
3755                         if (changed)
3756                                 dev_forward_change(idev);
3757                 } else {
3758                         *valp = new;
3759                         addrconf_forward_change();
3760                 }
3761
3762                 if (*valp)
3763                         rt6_purge_dflt_routers();
3764         } else
3765                 *valp = new;
3766
3767         return 1;
3768 }
3769
3770 static struct addrconf_sysctl_table
3771 {
3772         struct ctl_table_header *sysctl_header;
3773         ctl_table addrconf_vars[__NET_IPV6_MAX];
3774         ctl_table addrconf_dev[2];
3775         ctl_table addrconf_conf_dir[2];
3776         ctl_table addrconf_proto_dir[2];
3777         ctl_table addrconf_root_dir[2];
3778 } addrconf_sysctl __read_mostly = {
3779         .sysctl_header = NULL,
3780         .addrconf_vars = {
3781                 {
3782                         .ctl_name       =       NET_IPV6_FORWARDING,
3783                         .procname       =       "forwarding",
3784                         .data           =       &ipv6_devconf.forwarding,
3785                         .maxlen         =       sizeof(int),
3786                         .mode           =       0644,
3787                         .proc_handler   =       &addrconf_sysctl_forward,
3788                         .strategy       =       &addrconf_sysctl_forward_strategy,
3789                 },
3790                 {
3791                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3792                         .procname       =       "hop_limit",
3793                         .data           =       &ipv6_devconf.hop_limit,
3794                         .maxlen         =       sizeof(int),
3795                         .mode           =       0644,
3796                         .proc_handler   =       proc_dointvec,
3797                 },
3798                 {
3799                         .ctl_name       =       NET_IPV6_MTU,
3800                         .procname       =       "mtu",
3801                         .data           =       &ipv6_devconf.mtu6,
3802                         .maxlen         =       sizeof(int),
3803                         .mode           =       0644,
3804                         .proc_handler   =       &proc_dointvec,
3805                 },
3806                 {
3807                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3808                         .procname       =       "accept_ra",
3809                         .data           =       &ipv6_devconf.accept_ra,
3810                         .maxlen         =       sizeof(int),
3811                         .mode           =       0644,
3812                         .proc_handler   =       &proc_dointvec,
3813                 },
3814                 {
3815                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3816                         .procname       =       "accept_redirects",
3817                         .data           =       &ipv6_devconf.accept_redirects,
3818                         .maxlen         =       sizeof(int),
3819                         .mode           =       0644,
3820                         .proc_handler   =       &proc_dointvec,
3821                 },
3822                 {
3823                         .ctl_name       =       NET_IPV6_AUTOCONF,
3824                         .procname       =       "autoconf",
3825                         .data           =       &ipv6_devconf.autoconf,
3826                         .maxlen         =       sizeof(int),
3827                         .mode           =       0644,
3828                         .proc_handler   =       &proc_dointvec,
3829                 },
3830                 {
3831                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3832                         .procname       =       "dad_transmits",
3833                         .data           =       &ipv6_devconf.dad_transmits,
3834                         .maxlen         =       sizeof(int),
3835                         .mode           =       0644,
3836                         .proc_handler   =       &proc_dointvec,
3837                 },
3838                 {
3839                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3840                         .procname       =       "router_solicitations",
3841                         .data           =       &ipv6_devconf.rtr_solicits,
3842                         .maxlen         =       sizeof(int),
3843                         .mode           =       0644,
3844                         .proc_handler   =       &proc_dointvec,
3845                 },
3846                 {
3847                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3848                         .procname       =       "router_solicitation_interval",
3849                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3850                         .maxlen         =       sizeof(int),
3851                         .mode           =       0644,
3852                         .proc_handler   =       &proc_dointvec_jiffies,
3853                         .strategy       =       &sysctl_jiffies,
3854                 },
3855                 {
3856                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3857                         .procname       =       "router_solicitation_delay",
3858                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3859                         .maxlen         =       sizeof(int),
3860                         .mode           =       0644,
3861                         .proc_handler   =       &proc_dointvec_jiffies,
3862                         .strategy       =       &sysctl_jiffies,
3863                 },
3864                 {
3865                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3866                         .procname       =       "force_mld_version",
3867                         .data           =       &ipv6_devconf.force_mld_version,
3868                         .maxlen         =       sizeof(int),
3869                         .mode           =       0644,
3870                         .proc_handler   =       &proc_dointvec,
3871                 },
3872 #ifdef CONFIG_IPV6_PRIVACY
3873                 {
3874                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3875                         .procname       =       "use_tempaddr",
3876                         .data           =       &ipv6_devconf.use_tempaddr,
3877                         .maxlen         =       sizeof(int),
3878                         .mode           =       0644,
3879                         .proc_handler   =       &proc_dointvec,
3880                 },
3881                 {
3882                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3883                         .procname       =       "temp_valid_lft",
3884                         .data           =       &ipv6_devconf.temp_valid_lft,
3885                         .maxlen         =       sizeof(int),
3886                         .mode           =       0644,
3887                         .proc_handler   =       &proc_dointvec,
3888                 },
3889                 {
3890                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3891                         .procname       =       "temp_prefered_lft",
3892                         .data           =       &ipv6_devconf.temp_prefered_lft,
3893                         .maxlen         =       sizeof(int),
3894                         .mode           =       0644,
3895                         .proc_handler   =       &proc_dointvec,
3896                 },
3897                 {
3898                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3899                         .procname       =       "regen_max_retry",
3900                         .data           =       &ipv6_devconf.regen_max_retry,
3901                         .maxlen         =       sizeof(int),
3902                         .mode           =       0644,
3903                         .proc_handler   =       &proc_dointvec,
3904                 },
3905                 {
3906                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3907                         .procname       =       "max_desync_factor",
3908                         .data           =       &ipv6_devconf.max_desync_factor,
3909                         .maxlen         =       sizeof(int),
3910                         .mode           =       0644,
3911                         .proc_handler   =       &proc_dointvec,
3912                 },
3913 #endif
3914                 {
3915                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3916                         .procname       =       "max_addresses",
3917                         .data           =       &ipv6_devconf.max_addresses,
3918                         .maxlen         =       sizeof(int),
3919                         .mode           =       0644,
3920                         .proc_handler   =       &proc_dointvec,
3921                 },
3922                 {
3923                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3924                         .procname       =       "accept_ra_defrtr",
3925                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3926                         .maxlen         =       sizeof(int),
3927                         .mode           =       0644,
3928                         .proc_handler   =       &proc_dointvec,
3929                 },
3930                 {
3931                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3932                         .procname       =       "accept_ra_pinfo",
3933                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3934                         .maxlen         =       sizeof(int),
3935                         .mode           =       0644,
3936                         .proc_handler   =       &proc_dointvec,
3937                 },
3938 #ifdef CONFIG_IPV6_ROUTER_PREF
3939                 {
3940                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3941                         .procname       =       "accept_ra_rtr_pref",
3942                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3943                         .maxlen         =       sizeof(int),
3944                         .mode           =       0644,
3945                         .proc_handler   =       &proc_dointvec,
3946                 },
3947                 {
3948                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3949                         .procname       =       "router_probe_interval",
3950                         .data           =       &ipv6_devconf.rtr_probe_interval,
3951                         .maxlen         =       sizeof(int),
3952                         .mode           =       0644,
3953                         .proc_handler   =       &proc_dointvec_jiffies,
3954                         .strategy       =       &sysctl_jiffies,
3955                 },
3956 #ifdef CONFIG_IPV6_ROUTE_INFO
3957                 {
3958                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3959                         .procname       =       "accept_ra_rt_info_max_plen",
3960                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3961                         .maxlen         =       sizeof(int),
3962                         .mode           =       0644,
3963                         .proc_handler   =       &proc_dointvec,
3964                 },
3965 #endif
3966 #endif
3967                 {
3968                         .ctl_name       =       NET_IPV6_PROXY_NDP,
3969                         .procname       =       "proxy_ndp",
3970                         .data           =       &ipv6_devconf.proxy_ndp,
3971                         .maxlen         =       sizeof(int),
3972                         .mode           =       0644,
3973                         .proc_handler   =       &proc_dointvec,
3974                 },
3975                 {
3976                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
3977                         .procname       =       "accept_source_route",
3978                         .data           =       &ipv6_devconf.accept_source_route,
3979                         .maxlen         =       sizeof(int),
3980                         .mode           =       0644,
3981                         .proc_handler   =       &proc_dointvec,
3982                 },
3983                 {
3984                         .ctl_name       =       0,      /* sentinel */
3985                 }
3986         },
3987         .addrconf_dev = {
3988                 {
3989                         .ctl_name       =       NET_PROTO_CONF_ALL,
3990                         .procname       =       "all",
3991                         .mode           =       0555,
3992                         .child          =       addrconf_sysctl.addrconf_vars,
3993                 },
3994                 {
3995                         .ctl_name       =       0,      /* sentinel */
3996                 }
3997         },
3998         .addrconf_conf_dir = {
3999                 {
4000                         .ctl_name       =       NET_IPV6_CONF,
4001                         .procname       =       "conf",
4002                         .mode           =       0555,
4003                         .child          =       addrconf_sysctl.addrconf_dev,
4004                 },
4005                 {
4006                         .ctl_name       =       0,      /* sentinel */
4007                 }
4008         },
4009         .addrconf_proto_dir = {
4010                 {
4011                         .ctl_name       =       NET_IPV6,
4012                         .procname       =       "ipv6",
4013                         .mode           =       0555,
4014                         .child          =       addrconf_sysctl.addrconf_conf_dir,
4015                 },
4016                 {
4017                         .ctl_name       =       0,      /* sentinel */
4018                 }
4019         },
4020         .addrconf_root_dir = {
4021                 {
4022                         .ctl_name       =       CTL_NET,
4023                         .procname       =       "net",
4024                         .mode           =       0555,
4025                         .child          =       addrconf_sysctl.addrconf_proto_dir,
4026                 },
4027                 {
4028                         .ctl_name       =       0,      /* sentinel */
4029                 }
4030         },
4031 };
4032
4033 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4034 {
4035         int i;
4036         struct net_device *dev = idev ? idev->dev : NULL;
4037         struct addrconf_sysctl_table *t;
4038         char *dev_name = NULL;
4039
4040         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4041         if (t == NULL)
4042                 return;
4043         for (i=0; t->addrconf_vars[i].data; i++) {
4044                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4045                 t->addrconf_vars[i].de = NULL;
4046                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4047         }
4048         if (dev) {
4049                 dev_name = dev->name;
4050                 t->addrconf_dev[0].ctl_name = dev->ifindex;
4051         } else {
4052                 dev_name = "default";
4053                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4054         }
4055
4056         /*
4057          * Make a copy of dev_name, because '.procname' is regarded as const
4058          * by sysctl and we wouldn't want anyone to change it under our feet
4059          * (see SIOCSIFNAME).
4060          */
4061         dev_name = kstrdup(dev_name, GFP_KERNEL);
4062         if (!dev_name)
4063             goto free;
4064
4065         t->addrconf_dev[0].procname = dev_name;
4066
4067         t->addrconf_dev[0].child = t->addrconf_vars;
4068         t->addrconf_dev[0].de = NULL;
4069         t->addrconf_conf_dir[0].child = t->addrconf_dev;
4070         t->addrconf_conf_dir[0].de = NULL;
4071         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4072         t->addrconf_proto_dir[0].de = NULL;
4073         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4074         t->addrconf_root_dir[0].de = NULL;
4075
4076         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
4077         if (t->sysctl_header == NULL)
4078                 goto free_procname;
4079         else
4080                 p->sysctl = t;
4081         return;
4082
4083         /* error path */
4084  free_procname:
4085         kfree(dev_name);
4086  free:
4087         kfree(t);
4088
4089         return;
4090 }
4091
4092 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4093 {
4094         if (p->sysctl) {
4095                 struct addrconf_sysctl_table *t = p->sysctl;
4096                 p->sysctl = NULL;
4097                 unregister_sysctl_table(t->sysctl_header);
4098                 kfree(t->addrconf_dev[0].procname);
4099                 kfree(t);
4100         }
4101 }
4102
4103
4104 #endif
4105
4106 /*
4107  *      Device notifier
4108  */
4109
4110 int register_inet6addr_notifier(struct notifier_block *nb)
4111 {
4112         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4113 }
4114
4115 int unregister_inet6addr_notifier(struct notifier_block *nb)
4116 {
4117         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4118 }
4119
4120 /*
4121  *      Init / cleanup code
4122  */
4123
4124 int __init addrconf_init(void)
4125 {
4126         int err = 0;
4127
4128         /* The addrconf netdev notifier requires that loopback_dev
4129          * has it's ipv6 private information allocated and setup
4130          * before it can bring up and give link-local addresses
4131          * to other devices which are up.
4132          *
4133          * Unfortunately, loopback_dev is not necessarily the first
4134          * entry in the global dev_base list of net devices.  In fact,
4135          * it is likely to be the very last entry on that list.
4136          * So this causes the notifier registry below to try and
4137          * give link-local addresses to all devices besides loopback_dev
4138          * first, then loopback_dev, which cases all the non-loopback_dev
4139          * devices to fail to get a link-local address.
4140          *
4141          * So, as a temporary fix, allocate the ipv6 structure for
4142          * loopback_dev first by hand.
4143          * Longer term, all of the dependencies ipv6 has upon the loopback
4144          * device and it being up should be removed.
4145          */
4146         rtnl_lock();
4147         if (!ipv6_add_dev(&loopback_dev))
4148                 err = -ENOMEM;
4149         rtnl_unlock();
4150         if (err)
4151                 return err;
4152
4153         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4154
4155         register_netdevice_notifier(&ipv6_dev_notf);
4156
4157         addrconf_verify(0);
4158         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4159 #ifdef CONFIG_SYSCTL
4160         addrconf_sysctl.sysctl_header =
4161                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
4162         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4163 #endif
4164
4165         return 0;
4166 }
4167
4168 void __exit addrconf_cleanup(void)
4169 {
4170         struct net_device *dev;
4171         struct inet6_dev *idev;
4172         struct inet6_ifaddr *ifa;
4173         int i;
4174
4175         unregister_netdevice_notifier(&ipv6_dev_notf);
4176
4177         rtnetlink_links[PF_INET6] = NULL;
4178 #ifdef CONFIG_SYSCTL
4179         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4180         addrconf_sysctl_unregister(&ipv6_devconf);
4181 #endif
4182
4183         rtnl_lock();
4184
4185         /*
4186          *      clean dev list.
4187          */
4188
4189         for (dev=dev_base; dev; dev=dev->next) {
4190                 if ((idev = __in6_dev_get(dev)) == NULL)
4191                         continue;
4192                 addrconf_ifdown(dev, 1);
4193         }
4194         addrconf_ifdown(&loopback_dev, 2);
4195
4196         /*
4197          *      Check hash table.
4198          */
4199
4200         write_lock_bh(&addrconf_hash_lock);
4201         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4202                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4203                         struct inet6_ifaddr *bifa;
4204
4205                         bifa = ifa;
4206                         ifa = ifa->lst_next;
4207                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4208                         /* Do not free it; something is wrong.
4209                            Now we can investigate it with debugger.
4210                          */
4211                 }
4212         }
4213         write_unlock_bh(&addrconf_hash_lock);
4214
4215         del_timer(&addr_chk_timer);
4216
4217         rtnl_unlock();
4218
4219 #ifdef CONFIG_PROC_FS
4220         proc_net_remove("if_inet6");
4221 #endif
4222 }