net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/config.h>
  44 #include <linux/errno.h>
  45 #include <linux/types.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/sched.h>
  49 #include <linux/net.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #ifdef CONFIG_SYSCTL
  59 #include <linux/sysctl.h>
  60 #endif
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/sock.h>
  66 #include <net/snmp.h>
  67
  68 #include <net/ipv6.h>
  69 #include <net/protocol.h>
  70 #include <net/ndisc.h>
  71 #include <net/ip6_route.h>
  72 #include <net/addrconf.h>
  73 #include <net/tcp.h>
  74 #include <net/ip.h>
  75 #include <linux/if_tunnel.h>
  76 #include <linux/rtnetlink.h>
  77
  78 #ifdef CONFIG_IPV6_PRIVACY
  79 #include <linux/random.h>
  80 #include <linux/crypto.h>
  81 #include <linux/scatterlist.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 static struct crypto_tfm *md5_tfm;
 113 static DEFINE_SPINLOCK(md5_tfm_lock);
 114 #endif
 115
 116 static int ipv6_count_addresses(struct inet6_dev *idev);
 117
 118 /*
 119  *      Configured unicast address hash table
 120  */
 121 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 122 static DEFINE_RWLOCK(addrconf_hash_lock);
 123
 124 /* Protects inet6 devices */
 125 DEFINE_RWLOCK(addrconf_lock);
 126
 127 static void addrconf_verify(unsigned long);
 128
 129 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 130 static DEFINE_SPINLOCK(addrconf_verify_lock);
 131
 132 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 133 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 134
 135 static int addrconf_ifdown(struct net_device *dev, int how);
 136
 137 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 138 static void addrconf_dad_timer(unsigned long data);
 139 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 140 static void addrconf_dad_run(struct inet6_dev *idev);
 141 static void addrconf_rs_timer(unsigned long data);
 142 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 143 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 144
 145 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 146                                 struct prefix_info *pinfo);
 147 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 148
 149 static struct notifier_block *inet6addr_chain;
 150
 151 struct ipv6_devconf ipv6_devconf = {
 152         .forwarding             = 0,
 153         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 154         .mtu6                   = IPV6_MIN_MTU,
 155         .accept_ra              = 1,
 156         .accept_redirects       = 1,
 157         .autoconf               = 1,
 158         .force_mld_version      = 0,
 159         .dad_transmits          = 1,
 160         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 161         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 162         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 163 #ifdef CONFIG_IPV6_PRIVACY
 164         .use_tempaddr           = 0,
 165         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 166         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 167         .regen_max_retry        = REGEN_MAX_RETRY,
 168         .max_desync_factor      = MAX_DESYNC_FACTOR,
 169 #endif
 170         .max_addresses          = IPV6_MAX_ADDRESSES,
 171 };
 172
 173 static struct ipv6_devconf ipv6_devconf_dflt = {
 174         .forwarding             = 0,
 175         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 176         .mtu6                   = IPV6_MIN_MTU,
 177         .accept_ra              = 1,
 178         .accept_redirects       = 1,
 179         .autoconf               = 1,
 180         .dad_transmits          = 1,
 181         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 182         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 183         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 184 #ifdef CONFIG_IPV6_PRIVACY
 185         .use_tempaddr           = 0,
 186         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 187         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 188         .regen_max_retry        = REGEN_MAX_RETRY,
 189         .max_desync_factor      = MAX_DESYNC_FACTOR,
 190 #endif
 191         .max_addresses          = IPV6_MAX_ADDRESSES,
 192 };
 193
 194 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 195 #if 0
 196 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 197 #endif
 198 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 199
 200 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 201
 202 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 203 {
 204         switch(scope) {
 205         case IPV6_ADDR_SCOPE_NODELOCAL:
 206                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 207                         IPV6_ADDR_LOOPBACK);
 208         case IPV6_ADDR_SCOPE_LINKLOCAL:
 209                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 210                         IPV6_ADDR_LINKLOCAL);
 211         case IPV6_ADDR_SCOPE_SITELOCAL:
 212                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 213                         IPV6_ADDR_SITELOCAL);
 214         }
 215         return IPV6_ADDR_SCOPE_TYPE(scope);
 216 }
 217
 218 int __ipv6_addr_type(const struct in6_addr *addr)
 219 {
 220         u32 st;
 221
 222         st = addr->s6_addr32[0];
 223
 224         /* Consider all addresses with the first three bits different of
 225            000 and 111 as unicasts.
 226          */
 227         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 228             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 229                 return (IPV6_ADDR_UNICAST |
 230                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 231
 232         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 233                 /* multicast */
 234                 /* addr-select 3.1 */
 235                 return (IPV6_ADDR_MULTICAST |
 236                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 237         }
 238
 239         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 240                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 241                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 242         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 243                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 244                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 245
 246         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 247                 if (addr->s6_addr32[2] == 0) {
 248                         if (addr->s6_addr32[3] == 0)
 249                                 return IPV6_ADDR_ANY;
 250
 251                         if (addr->s6_addr32[3] == htonl(0x00000001))
 252                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 253                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 254
 255                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 256                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 257                 }
 258
 259                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 260                         return (IPV6_ADDR_MAPPED |
 261                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 262         }
 263
 264         return (IPV6_ADDR_RESERVED |
 265                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 266 }
 267
 268 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 269 {
 270         if (del_timer(&ifp->timer))
 271                 __in6_ifa_put(ifp);
 272 }
 273
 274 enum addrconf_timer_t
 275 {
 276         AC_NONE,
 277         AC_DAD,
 278         AC_RS,
 279 };
 280
 281 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 282                                enum addrconf_timer_t what,
 283                                unsigned long when)
 284 {
 285         if (!del_timer(&ifp->timer))
 286                 in6_ifa_hold(ifp);
 287
 288         switch (what) {
 289         case AC_DAD:
 290                 ifp->timer.function = addrconf_dad_timer;
 291                 break;
 292         case AC_RS:
 293                 ifp->timer.function = addrconf_rs_timer;
 294                 break;
 295         default:;
 296         }
 297         ifp->timer.expires = jiffies + when;
 298         add_timer(&ifp->timer);
 299 }
 300
 301 /* Nobody refers to this device, we may destroy it. */
 302
 303 void in6_dev_finish_destroy(struct inet6_dev *idev)
 304 {
 305         struct net_device *dev = idev->dev;
 306         BUG_TRAP(idev->addr_list==NULL);
 307         BUG_TRAP(idev->mc_list==NULL);
 308 #ifdef NET_REFCNT_DEBUG
 309         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 310 #endif
 311         dev_put(dev);
 312         if (!idev->dead) {
 313                 printk("Freeing alive inet6 device %p\n", idev);
 314                 return;
 315         }
 316         snmp6_free_dev(idev);
 317         kfree(idev);
 318 }
 319
 320 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 321 {
 322         struct inet6_dev *ndev;
 323
 324         ASSERT_RTNL();
 325
 326         if (dev->mtu < IPV6_MIN_MTU)
 327                 return NULL;
 328
 329         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 330
 331         if (ndev) {
 332                 memset(ndev, 0, sizeof(struct inet6_dev));
 333
 334                 rwlock_init(&ndev->lock);
 335                 ndev->dev = dev;
 336                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 337                 ndev->cnf.mtu6 = dev->mtu;
 338                 ndev->cnf.sysctl = NULL;
 339                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 340                 if (ndev->nd_parms == NULL) {
 341                         kfree(ndev);
 342                         return NULL;
 343                 }
 344                 /* We refer to the device */
 345                 dev_hold(dev);
 346
 347                 if (snmp6_alloc_dev(ndev) < 0) {
 348                         ADBG((KERN_WARNING
 349                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
 350                                 __FUNCTION__, dev->name));
 351                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 352                         ndev->dead = 1;
 353                         in6_dev_finish_destroy(ndev);
 354                         return NULL;
 355                 }
 356
 357                 if (snmp6_register_dev(ndev) < 0) {
 358                         ADBG((KERN_WARNING
 359                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 360                                 __FUNCTION__, dev->name));
 361                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 362                         ndev->dead = 1;
 363                         in6_dev_finish_destroy(ndev);
 364                         return NULL;
 365                 }
 366
 367                 /* One reference from device.  We must do this before
 368                  * we invoke __ipv6_regen_rndid().
 369                  */
 370                 in6_dev_hold(ndev);
 371
 372 #ifdef CONFIG_IPV6_PRIVACY
 373                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
 374                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
 375                 init_timer(&ndev->regen_timer);
 376                 ndev->regen_timer.function = ipv6_regen_rndid;
 377                 ndev->regen_timer.data = (unsigned long) ndev;
 378                 if ((dev->flags&IFF_LOOPBACK) ||
 379                     dev->type == ARPHRD_TUNNEL ||
 380                     dev->type == ARPHRD_NONE ||
 381                     dev->type == ARPHRD_SIT) {
 382                         printk(KERN_INFO
 383                                "%s: Disabled Privacy Extensions\n",
 384                                dev->name);
 385                         ndev->cnf.use_tempaddr = -1;
 386                 } else {
 387                         in6_dev_hold(ndev);
 388                         ipv6_regen_rndid((unsigned long) ndev);
 389                 }
 390 #endif
 391
 392                 if (netif_carrier_ok(dev))
 393                         ndev->if_flags |= IF_READY;
 394
 395                 write_lock_bh(&addrconf_lock);
 396                 dev->ip6_ptr = ndev;
 397                 write_unlock_bh(&addrconf_lock);
 398
 399                 ipv6_mc_init_dev(ndev);
 400                 ndev->tstamp = jiffies;
 401 #ifdef CONFIG_SYSCTL
 402                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 403                                       NET_IPV6_NEIGH, "ipv6",
 404                                       &ndisc_ifinfo_sysctl_change,
 405                                       NULL);
 406                 addrconf_sysctl_register(ndev, &ndev->cnf);
 407 #endif
 408         }
 409         return ndev;
 410 }
 411
 412 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 413 {
 414         struct inet6_dev *idev;
 415
 416         ASSERT_RTNL();
 417
 418         if ((idev = __in6_dev_get(dev)) == NULL) {
 419                 if ((idev = ipv6_add_dev(dev)) == NULL)
 420                         return NULL;
 421         }
 422
 423         if (dev->flags&IFF_UP)
 424                 ipv6_mc_up(idev);
 425         return idev;
 426 }
 427
 428 #ifdef CONFIG_SYSCTL
 429 static void dev_forward_change(struct inet6_dev *idev)
 430 {
 431         struct net_device *dev;
 432         struct inet6_ifaddr *ifa;
 433         struct in6_addr addr;
 434
 435         if (!idev)
 436                 return;
 437         dev = idev->dev;
 438         if (dev && (dev->flags & IFF_MULTICAST)) {
 439                 ipv6_addr_all_routers(&addr);
 440
 441                 if (idev->cnf.forwarding)
 442                         ipv6_dev_mc_inc(dev, &addr);
 443                 else
 444                         ipv6_dev_mc_dec(dev, &addr);
 445         }
 446         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 447                 if (idev->cnf.forwarding)
 448                         addrconf_join_anycast(ifa);
 449                 else
 450                         addrconf_leave_anycast(ifa);
 451         }
 452 }
 453
 454
 455 static void addrconf_forward_change(void)
 456 {
 457         struct net_device *dev;
 458         struct inet6_dev *idev;
 459
 460         read_lock(&dev_base_lock);
 461         for (dev=dev_base; dev; dev=dev->next) {
 462                 read_lock(&addrconf_lock);
 463                 idev = __in6_dev_get(dev);
 464                 if (idev) {
 465                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 466                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 467                         if (changed)
 468                                 dev_forward_change(idev);
 469                 }
 470                 read_unlock(&addrconf_lock);
 471         }
 472         read_unlock(&dev_base_lock);
 473 }
 474 #endif
 475
 476 /* Nobody refers to this ifaddr, destroy it */
 477
 478 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 479 {
 480         BUG_TRAP(ifp->if_next==NULL);
 481         BUG_TRAP(ifp->lst_next==NULL);
 482 #ifdef NET_REFCNT_DEBUG
 483         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 484 #endif
 485
 486         in6_dev_put(ifp->idev);
 487
 488         if (del_timer(&ifp->timer))
 489                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 490
 491         if (!ifp->dead) {
 492                 printk("Freeing alive inet6 address %p\n", ifp);
 493                 return;
 494         }
 495         dst_release(&ifp->rt->u.dst);
 496
 497         kfree(ifp);
 498 }
 499
 500 /* On success it returns ifp with increased reference count */
 501
 502 static struct inet6_ifaddr *
 503 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 504               int scope, u32 flags)
 505 {
 506         struct inet6_ifaddr *ifa = NULL;
 507         struct rt6_info *rt;
 508         int hash;
 509         int err = 0;
 510
 511         read_lock_bh(&addrconf_lock);
 512         if (idev->dead) {
 513                 err = -ENODEV;                  /*XXX*/
 514                 goto out2;
 515         }
 516
 517         write_lock(&addrconf_hash_lock);
 518
 519         /* Ignore adding duplicate addresses on an interface */
 520         if (ipv6_chk_same_addr(addr, idev->dev)) {
 521                 ADBG(("ipv6_add_addr: already assigned\n"));
 522                 err = -EEXIST;
 523                 goto out;
 524         }
 525
 526         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 527
 528         if (ifa == NULL) {
 529                 ADBG(("ipv6_add_addr: malloc failed\n"));
 530                 err = -ENOBUFS;
 531                 goto out;
 532         }
 533
 534         rt = addrconf_dst_alloc(idev, addr, 0);
 535         if (IS_ERR(rt)) {
 536                 err = PTR_ERR(rt);
 537                 goto out;
 538         }
 539
 540         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 541         ipv6_addr_copy(&ifa->addr, addr);
 542
 543         spin_lock_init(&ifa->lock);
 544         init_timer(&ifa->timer);
 545         ifa->timer.data = (unsigned long) ifa;
 546         ifa->scope = scope;
 547         ifa->prefix_len = pfxlen;
 548         ifa->flags = flags | IFA_F_TENTATIVE;
 549         ifa->cstamp = ifa->tstamp = jiffies;
 550
 551         ifa->idev = idev;
 552         in6_dev_hold(idev);
 553         /* For caller */
 554         in6_ifa_hold(ifa);
 555
 556         /* Add to big hash table */
 557         hash = ipv6_addr_hash(addr);
 558
 559         ifa->lst_next = inet6_addr_lst[hash];
 560         inet6_addr_lst[hash] = ifa;
 561         in6_ifa_hold(ifa);
 562         write_unlock(&addrconf_hash_lock);
 563
 564         write_lock(&idev->lock);
 565         /* Add to inet6_dev unicast addr list. */
 566         ifa->if_next = idev->addr_list;
 567         idev->addr_list = ifa;
 568
 569 #ifdef CONFIG_IPV6_PRIVACY
 570         if (ifa->flags&IFA_F_TEMPORARY) {
 571                 ifa->tmp_next = idev->tempaddr_list;
 572                 idev->tempaddr_list = ifa;
 573                 in6_ifa_hold(ifa);
 574         }
 575 #endif
 576
 577         ifa->rt = rt;
 578
 579         in6_ifa_hold(ifa);
 580         write_unlock(&idev->lock);
 581 out2:
 582         read_unlock_bh(&addrconf_lock);
 583
 584         if (likely(err == 0))
 585                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 586         else {
 587                 kfree(ifa);
 588                 ifa = ERR_PTR(err);
 589         }
 590
 591         return ifa;
 592 out:
 593         write_unlock(&addrconf_hash_lock);
 594         goto out2;
 595 }
 596
 597 /* This function wants to get referenced ifp and releases it before return */
 598
 599 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 600 {
 601         struct inet6_ifaddr *ifa, **ifap;
 602         struct inet6_dev *idev = ifp->idev;
 603         int hash;
 604         int deleted = 0, onlink = 0;
 605         unsigned long expires = jiffies;
 606
 607         hash = ipv6_addr_hash(&ifp->addr);
 608
 609         ifp->dead = 1;
 610
 611         write_lock_bh(&addrconf_hash_lock);
 612         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 613              ifap = &ifa->lst_next) {
 614                 if (ifa == ifp) {
 615                         *ifap = ifa->lst_next;
 616                         __in6_ifa_put(ifp);
 617                         ifa->lst_next = NULL;
 618                         break;
 619                 }
 620         }
 621         write_unlock_bh(&addrconf_hash_lock);
 622
 623         write_lock_bh(&idev->lock);
 624 #ifdef CONFIG_IPV6_PRIVACY
 625         if (ifp->flags&IFA_F_TEMPORARY) {
 626                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 627                      ifap = &ifa->tmp_next) {
 628                         if (ifa == ifp) {
 629                                 *ifap = ifa->tmp_next;
 630                                 if (ifp->ifpub) {
 631                                         in6_ifa_put(ifp->ifpub);
 632                                         ifp->ifpub = NULL;
 633                                 }
 634                                 __in6_ifa_put(ifp);
 635                                 ifa->tmp_next = NULL;
 636                                 break;
 637                         }
 638                 }
 639         }
 640 #endif
 641
 642         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
 643              ifap = &ifa->if_next) {
 644                 if (ifa == ifp) {
 645                         *ifap = ifa->if_next;
 646                         __in6_ifa_put(ifp);
 647                         ifa->if_next = NULL;
 648                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 649                                 break;
 650                         deleted = 1;
 651                 } else if (ifp->flags & IFA_F_PERMANENT) {
 652                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 653                                               ifp->prefix_len)) {
 654                                 if (ifa->flags & IFA_F_PERMANENT) {
 655                                         onlink = 1;
 656                                         if (deleted)
 657                                                 break;
 658                                 } else {
 659                                         unsigned long lifetime;
 660
 661                                         if (!onlink)
 662                                                 onlink = -1;
 663
 664                                         spin_lock(&ifa->lock);
 665                                         lifetime = min_t(unsigned long,
 666                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 667                                         if (time_before(expires,
 668                                                         ifa->tstamp + lifetime * HZ))
 669                                                 expires = ifa->tstamp + lifetime * HZ;
 670                                         spin_unlock(&ifa->lock);
 671                                 }
 672                         }
 673                 }
 674         }
 675         write_unlock_bh(&idev->lock);
 676
 677         ipv6_ifa_notify(RTM_DELADDR, ifp);
 678
 679         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 680
 681         addrconf_del_timer(ifp);
 682
 683         /*
 684          * Purge or update corresponding prefix
 685          *
 686          * 1) we don't purge prefix here if address was not permanent.
 687          *    prefix is managed by its own lifetime.
 688          * 2) if there're no addresses, delete prefix.
 689          * 3) if there're still other permanent address(es),
 690          *    corresponding prefix is still permanent.
 691          * 4) otherwise, update prefix lifetime to the
 692          *    longest valid lifetime among the corresponding
 693          *    addresses on the device.
 694          *    Note: subsequent RA will update lifetime.
 695          *
 696          * --yoshfuji
 697          */
 698         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 699                 struct in6_addr prefix;
 700                 struct rt6_info *rt;
 701
 702                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 703                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 704
 705                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 706                         if (onlink == 0) {
 707                                 ip6_del_rt(rt, NULL, NULL, NULL);
 708                                 rt = NULL;
 709                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 710                                 rt->rt6i_expires = expires;
 711                                 rt->rt6i_flags |= RTF_EXPIRES;
 712                         }
 713                 }
 714                 dst_release(&rt->u.dst);
 715         }
 716
 717         in6_ifa_put(ifp);
 718 }
 719
 720 #ifdef CONFIG_IPV6_PRIVACY
 721 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 722 {
 723         struct inet6_dev *idev = ifp->idev;
 724         struct in6_addr addr, *tmpaddr;
 725         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 726         int tmp_plen;
 727         int ret = 0;
 728         int max_addresses;
 729
 730         write_lock(&idev->lock);
 731         if (ift) {
 732                 spin_lock_bh(&ift->lock);
 733                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 734                 spin_unlock_bh(&ift->lock);
 735                 tmpaddr = &addr;
 736         } else {
 737                 tmpaddr = NULL;
 738         }
 739 retry:
 740         in6_dev_hold(idev);
 741         if (idev->cnf.use_tempaddr <= 0) {
 742                 write_unlock(&idev->lock);
 743                 printk(KERN_INFO
 744                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 745                 in6_dev_put(idev);
 746                 ret = -1;
 747                 goto out;
 748         }
 749         spin_lock_bh(&ifp->lock);
 750         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 751                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 752                 spin_unlock_bh(&ifp->lock);
 753                 write_unlock(&idev->lock);
 754                 printk(KERN_WARNING
 755                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 756                 in6_dev_put(idev);
 757                 ret = -1;
 758                 goto out;
 759         }
 760         in6_ifa_hold(ifp);
 761         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 762         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 763                 spin_unlock_bh(&ifp->lock);
 764                 write_unlock(&idev->lock);
 765                 printk(KERN_WARNING
 766                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 767                 in6_ifa_put(ifp);
 768                 in6_dev_put(idev);
 769                 ret = -1;
 770                 goto out;
 771         }
 772         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 773         tmp_valid_lft = min_t(__u32,
 774                               ifp->valid_lft,
 775                               idev->cnf.temp_valid_lft);
 776         tmp_prefered_lft = min_t(__u32,
 777                                  ifp->prefered_lft,
 778                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 779         tmp_plen = ifp->prefix_len;
 780         max_addresses = idev->cnf.max_addresses;
 781         tmp_cstamp = ifp->cstamp;
 782         tmp_tstamp = ifp->tstamp;
 783         spin_unlock_bh(&ifp->lock);
 784
 785         write_unlock(&idev->lock);
 786         ift = !max_addresses ||
 787               ipv6_count_addresses(idev) < max_addresses ?
 788                 ipv6_add_addr(idev, &addr, tmp_plen,
 789                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 790         if (!ift || IS_ERR(ift)) {
 791                 in6_ifa_put(ifp);
 792                 in6_dev_put(idev);
 793                 printk(KERN_INFO
 794                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 795                 tmpaddr = &addr;
 796                 write_lock(&idev->lock);
 797                 goto retry;
 798         }
 799
 800         spin_lock_bh(&ift->lock);
 801         ift->ifpub = ifp;
 802         ift->valid_lft = tmp_valid_lft;
 803         ift->prefered_lft = tmp_prefered_lft;
 804         ift->cstamp = tmp_cstamp;
 805         ift->tstamp = tmp_tstamp;
 806         spin_unlock_bh(&ift->lock);
 807
 808         addrconf_dad_start(ift, 0);
 809         in6_ifa_put(ift);
 810         in6_dev_put(idev);
 811 out:
 812         return ret;
 813 }
 814 #endif
 815
 816 /*
 817  *      Choose an appropriate source address (RFC3484)
 818  */
 819 struct ipv6_saddr_score {
 820         int             addr_type;
 821         unsigned int    attrs;
 822         int             matchlen;
 823         unsigned int    scope;
 824         unsigned int    rule;
 825 };
 826
 827 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 828 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 829 #define IPV6_SADDR_SCORE_HOA            0x0008
 830 #define IPV6_SADDR_SCORE_OIF            0x0010
 831 #define IPV6_SADDR_SCORE_LABEL          0x0020
 832 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 833
 834 static int inline ipv6_saddr_preferred(int type)
 835 {
 836         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 837                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 838                 return 1;
 839         return 0;
 840 }
 841
 842 /* static matching label */
 843 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 844 {
 845  /*
 846   *     prefix (longest match)  label
 847   *     -----------------------------
 848   *     ::1/128                 0
 849   *     ::/0                    1
 850   *     2002::/16               2
 851   *     ::/96                   3
 852   *     ::ffff:0:0/96           4
 853   */
 854         if (type & IPV6_ADDR_LOOPBACK)
 855                 return 0;
 856         else if (type & IPV6_ADDR_COMPATv4)
 857                 return 3;
 858         else if (type & IPV6_ADDR_MAPPED)
 859                 return 4;
 860         else if (addr->s6_addr16[0] == htons(0x2002))
 861                 return 2;
 862         return 1;
 863 }
 864
 865 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 866                        struct in6_addr *daddr, struct in6_addr *saddr)
 867 {
 868         struct ipv6_saddr_score hiscore;
 869         struct inet6_ifaddr *ifa_result = NULL;
 870         int daddr_type = __ipv6_addr_type(daddr);
 871         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 872         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 873         struct net_device *dev;
 874
 875         memset(&hiscore, 0, sizeof(hiscore));
 876
 877         read_lock(&dev_base_lock);
 878         read_lock(&addrconf_lock);
 879
 880         for (dev = dev_base; dev; dev=dev->next) {
 881                 struct inet6_dev *idev;
 882                 struct inet6_ifaddr *ifa;
 883
 884                 /* Rule 0: Candidate Source Address (section 4)
 885                  *  - multicast and link-local destination address,
 886                  *    the set of candidate source address MUST only
 887                  *    include addresses assigned to interfaces
 888                  *    belonging to the same link as the outgoing
 889                  *    interface.
 890                  * (- For site-local destination addresses, the
 891                  *    set of candidate source addresses MUST only
 892                  *    include addresses assigned to interfaces
 893                  *    belonging to the same site as the outgoing
 894                  *    interface.)
 895                  */
 896                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 897                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 898                     daddr_dev && dev != daddr_dev)
 899                         continue;
 900
 901                 idev = __in6_dev_get(dev);
 902                 if (!idev)
 903                         continue;
 904
 905                 read_lock_bh(&idev->lock);
 906                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 907                         struct ipv6_saddr_score score;
 908
 909                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 910
 911                         /* Rule 0:
 912                          * - Tentative Address (RFC2462 section 5.4)
 913                          *  - A tentative address is not considered
 914                          *    "assigned to an interface" in the traditional
 915                          *    sense.
 916                          * - Candidate Source Address (section 4)
 917                          *  - In any case, anycast addresses, multicast
 918                          *    addresses, and the unspecified address MUST
 919                          *    NOT be included in a candidate set.
 920                          */
 921                         if (ifa->flags & IFA_F_TENTATIVE)
 922                                 continue;
 923                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 924                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 925                                 LIMIT_NETDEBUG(KERN_DEBUG
 926                                                "ADDRCONF: unspecified / multicast address"
 927                                                "assigned as unicast address on %s",
 928                                                dev->name);
 929                                 continue;
 930                         }
 931
 932                         score.attrs = 0;
 933                         score.matchlen = 0;
 934                         score.scope = 0;
 935                         score.rule = 0;
 936
 937                         if (ifa_result == NULL) {
 938                                 /* record it if the first available entry */
 939                                 goto record_it;
 940                         }
 941
 942                         /* Rule 1: Prefer same address */
 943                         if (hiscore.rule < 1) {
 944                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 945                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 946                                 hiscore.rule++;
 947                         }
 948                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 949                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 950                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 951                                         score.rule = 1;
 952                                         goto record_it;
 953                                 }
 954                         } else {
 955                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 956                                         continue;
 957                         }
 958
 959                         /* Rule 2: Prefer appropriate scope */
 960                         if (hiscore.rule < 2) {
 961                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 962                                 hiscore.rule++;
 963                         }
 964                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 965                         if (hiscore.scope < score.scope) {
 966                                 if (hiscore.scope < daddr_scope) {
 967                                         score.rule = 2;
 968                                         goto record_it;
 969                                 } else
 970                                         continue;
 971                         } else if (score.scope < hiscore.scope) {
 972                                 if (score.scope < daddr_scope)
 973                                         continue;
 974                                 else {
 975                                         score.rule = 2;
 976                                         goto record_it;
 977                                 }
 978                         }
 979
 980                         /* Rule 3: Avoid deprecated address */
 981                         if (hiscore.rule < 3) {
 982                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 983                                     !(ifa_result->flags & IFA_F_DEPRECATED))
 984                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 985                                 hiscore.rule++;
 986                         }
 987                         if (ipv6_saddr_preferred(score.addr_type) ||
 988                             !(ifa->flags & IFA_F_DEPRECATED)) {
 989                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 990                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
 991                                         score.rule = 3;
 992                                         goto record_it;
 993                                 }
 994                         } else {
 995                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
 996                                         continue;
 997                         }
 998
 999                         /* Rule 4: Prefer home address -- not implemented yet */
1000                         if (hiscore.rule < 4)
1001                                 hiscore.rule++;
1002
1003                         /* Rule 5: Prefer outgoing interface */
1004                         if (hiscore.rule < 5) {
1005                                 if (daddr_dev == NULL ||
1006                                     daddr_dev == ifa_result->idev->dev)
1007                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1008                                 hiscore.rule++;
1009                         }
1010                         if (daddr_dev == NULL ||
1011                             daddr_dev == ifa->idev->dev) {
1012                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1013                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1014                                         score.rule = 5;
1015                                         goto record_it;
1016                                 }
1017                         } else {
1018                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1019                                         continue;
1020                         }
1021
1022                         /* Rule 6: Prefer matching label */
1023                         if (hiscore.rule < 6) {
1024                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1025                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1026                                 hiscore.rule++;
1027                         }
1028                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1029                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1030                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1031                                         score.rule = 6;
1032                                         goto record_it;
1033                                 }
1034                         } else {
1035                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1036                                         continue;
1037                         }
1038
1039 #ifdef CONFIG_IPV6_PRIVACY
1040                         /* Rule 7: Prefer public address
1041                          * Note: prefer temprary address if use_tempaddr >= 2
1042                          */
1043                         if (hiscore.rule < 7) {
1044                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1045                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1046                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1047                                 hiscore.rule++;
1048                         }
1049                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1050                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1051                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1052                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1053                                         score.rule = 7;
1054                                         goto record_it;
1055                                 }
1056                         } else {
1057                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1058                                         continue;
1059                         }
1060 #endif
1061                         /* Rule 8: Use longest matching prefix */
1062                         if (hiscore.rule < 8) {
1063                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1064                                 hiscore.rule++;
1065                         }
1066                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1067                         if (score.matchlen > hiscore.matchlen) {
1068                                 score.rule = 8;
1069                                 goto record_it;
1070                         }
1071 #if 0
1072                         else if (score.matchlen < hiscore.matchlen)
1073                                 continue;
1074 #endif
1075
1076                         /* Final Rule: choose first available one */
1077                         continue;
1078 record_it:
1079                         if (ifa_result)
1080                                 in6_ifa_put(ifa_result);
1081                         in6_ifa_hold(ifa);
1082                         ifa_result = ifa;
1083                         hiscore = score;
1084                 }
1085                 read_unlock_bh(&idev->lock);
1086         }
1087         read_unlock(&addrconf_lock);
1088         read_unlock(&dev_base_lock);
1089
1090         if (!ifa_result)
1091                 return -EADDRNOTAVAIL;
1092
1093         ipv6_addr_copy(saddr, &ifa_result->addr);
1094         in6_ifa_put(ifa_result);
1095         return 0;
1096 }
1097
1098
1099 int ipv6_get_saddr(struct dst_entry *dst,
1100                    struct in6_addr *daddr, struct in6_addr *saddr)
1101 {
1102         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1103 }
1104
1105
1106 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1107 {
1108         struct inet6_dev *idev;
1109         int err = -EADDRNOTAVAIL;
1110
1111         read_lock(&addrconf_lock);
1112         if ((idev = __in6_dev_get(dev)) != NULL) {
1113                 struct inet6_ifaddr *ifp;
1114
1115                 read_lock_bh(&idev->lock);
1116                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1117                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1118                                 ipv6_addr_copy(addr, &ifp->addr);
1119                                 err = 0;
1120                                 break;
1121                         }
1122                 }
1123                 read_unlock_bh(&idev->lock);
1124         }
1125         read_unlock(&addrconf_lock);
1126         return err;
1127 }
1128
1129 static int ipv6_count_addresses(struct inet6_dev *idev)
1130 {
1131         int cnt = 0;
1132         struct inet6_ifaddr *ifp;
1133
1134         read_lock_bh(&idev->lock);
1135         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1136                 cnt++;
1137         read_unlock_bh(&idev->lock);
1138         return cnt;
1139 }
1140
1141 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1142 {
1143         struct inet6_ifaddr * ifp;
1144         u8 hash = ipv6_addr_hash(addr);
1145
1146         read_lock_bh(&addrconf_hash_lock);
1147         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1148                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1149                     !(ifp->flags&IFA_F_TENTATIVE)) {
1150                         if (dev == NULL || ifp->idev->dev == dev ||
1151                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1152                                 break;
1153                 }
1154         }
1155         read_unlock_bh(&addrconf_hash_lock);
1156         return ifp != NULL;
1157 }
1158
1159 static
1160 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1161 {
1162         struct inet6_ifaddr * ifp;
1163         u8 hash = ipv6_addr_hash(addr);
1164
1165         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1166                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1167                         if (dev == NULL || ifp->idev->dev == dev)
1168                                 break;
1169                 }
1170         }
1171         return ifp != NULL;
1172 }
1173
1174 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1175 {
1176         struct inet6_ifaddr * ifp;
1177         u8 hash = ipv6_addr_hash(addr);
1178
1179         read_lock_bh(&addrconf_hash_lock);
1180         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1181                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1182                         if (dev == NULL || ifp->idev->dev == dev ||
1183                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1184                                 in6_ifa_hold(ifp);
1185                                 break;
1186                         }
1187                 }
1188         }
1189         read_unlock_bh(&addrconf_hash_lock);
1190
1191         return ifp;
1192 }
1193
1194 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1195 {
1196         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1197         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1198         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1199         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1200         int sk_ipv6only = ipv6_only_sock(sk);
1201         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1202         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1203         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1204
1205         if (!sk2_rcv_saddr && !sk_ipv6only)
1206                 return 1;
1207
1208         if (addr_type2 == IPV6_ADDR_ANY &&
1209             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1210                 return 1;
1211
1212         if (addr_type == IPV6_ADDR_ANY &&
1213             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1214                 return 1;
1215
1216         if (sk2_rcv_saddr6 &&
1217             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1218                 return 1;
1219
1220         if (addr_type == IPV6_ADDR_MAPPED &&
1221             !sk2_ipv6only &&
1222             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1223                 return 1;
1224
1225         return 0;
1226 }
1227
1228 /* Gets referenced address, destroys ifaddr */
1229
1230 void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1231 {
1232         if (ifp->flags&IFA_F_PERMANENT) {
1233                 spin_lock_bh(&ifp->lock);
1234                 addrconf_del_timer(ifp);
1235                 ifp->flags |= IFA_F_TENTATIVE;
1236                 spin_unlock_bh(&ifp->lock);
1237                 in6_ifa_put(ifp);
1238 #ifdef CONFIG_IPV6_PRIVACY
1239         } else if (ifp->flags&IFA_F_TEMPORARY) {
1240                 struct inet6_ifaddr *ifpub;
1241                 spin_lock_bh(&ifp->lock);
1242                 ifpub = ifp->ifpub;
1243                 if (ifpub) {
1244                         in6_ifa_hold(ifpub);
1245                         spin_unlock_bh(&ifp->lock);
1246                         ipv6_create_tempaddr(ifpub, ifp);
1247                         in6_ifa_put(ifpub);
1248                 } else {
1249                         spin_unlock_bh(&ifp->lock);
1250                 }
1251                 ipv6_del_addr(ifp);
1252 #endif
1253         } else
1254                 ipv6_del_addr(ifp);
1255 }
1256
1257 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1258 {
1259         if (net_ratelimit())
1260                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1261         addrconf_dad_stop(ifp);
1262 }
1263
1264 /* Join to solicited addr multicast group. */
1265
1266 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1267 {
1268         struct in6_addr maddr;
1269
1270         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1271                 return;
1272
1273         addrconf_addr_solict_mult(addr, &maddr);
1274         ipv6_dev_mc_inc(dev, &maddr);
1275 }
1276
1277 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1278 {
1279         struct in6_addr maddr;
1280
1281         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1282                 return;
1283
1284         addrconf_addr_solict_mult(addr, &maddr);
1285         __ipv6_dev_mc_dec(idev, &maddr);
1286 }
1287
1288 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1289 {
1290         struct in6_addr addr;
1291         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1292         if (ipv6_addr_any(&addr))
1293                 return;
1294         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1295 }
1296
1297 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1298 {
1299         struct in6_addr addr;
1300         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1301         if (ipv6_addr_any(&addr))
1302                 return;
1303         __ipv6_dev_ac_dec(ifp->idev, &addr);
1304 }
1305
1306 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1307 {
1308         switch (dev->type) {
1309         case ARPHRD_ETHER:
1310         case ARPHRD_FDDI:
1311         case ARPHRD_IEEE802_TR:
1312                 if (dev->addr_len != ETH_ALEN)
1313                         return -1;
1314                 memcpy(eui, dev->dev_addr, 3);
1315                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1316
1317                 /*
1318                  * The zSeries OSA network cards can be shared among various
1319                  * OS instances, but the OSA cards have only one MAC address.
1320                  * This leads to duplicate address conflicts in conjunction
1321                  * with IPv6 if more than one instance uses the same card.
1322                  *
1323                  * The driver for these cards can deliver a unique 16-bit
1324                  * identifier for each instance sharing the same card.  It is
1325                  * placed instead of 0xFFFE in the interface identifier.  The
1326                  * "u" bit of the interface identifier is not inverted in this
1327                  * case.  Hence the resulting interface identifier has local
1328                  * scope according to RFC2373.
1329                  */
1330                 if (dev->dev_id) {
1331                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1332                         eui[4] = dev->dev_id & 0xFF;
1333                 } else {
1334                         eui[3] = 0xFF;
1335                         eui[4] = 0xFE;
1336                         eui[0] ^= 2;
1337                 }
1338                 return 0;
1339         case ARPHRD_ARCNET:
1340                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1341                 if (dev->addr_len != ARCNET_ALEN)
1342                         return -1;
1343                 memset(eui, 0, 7);
1344                 eui[7] = *(u8*)dev->dev_addr;
1345                 return 0;
1346         case ARPHRD_INFINIBAND:
1347                 if (dev->addr_len != INFINIBAND_ALEN)
1348                         return -1;
1349                 memcpy(eui, dev->dev_addr + 12, 8);
1350                 eui[0] |= 2;
1351                 return 0;
1352         }
1353         return -1;
1354 }
1355
1356 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1357 {
1358         int err = -1;
1359         struct inet6_ifaddr *ifp;
1360
1361         read_lock_bh(&idev->lock);
1362         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1363                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1364                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1365                         err = 0;
1366                         break;
1367                 }
1368         }
1369         read_unlock_bh(&idev->lock);
1370         return err;
1371 }
1372
1373 #ifdef CONFIG_IPV6_PRIVACY
1374 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1375 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1376 {
1377         struct net_device *dev;
1378         struct scatterlist sg[2];
1379
1380         sg_set_buf(&sg[0], idev->entropy, 8);
1381         sg_set_buf(&sg[1], idev->work_eui64, 8);
1382
1383         dev = idev->dev;
1384
1385         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1386                 printk(KERN_INFO
1387                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1388                         idev);
1389                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1390         }
1391 regen:
1392         spin_lock(&md5_tfm_lock);
1393         if (unlikely(md5_tfm == NULL)) {
1394                 spin_unlock(&md5_tfm_lock);
1395                 return -1;
1396         }
1397         crypto_digest_init(md5_tfm);
1398         crypto_digest_update(md5_tfm, sg, 2);
1399         crypto_digest_final(md5_tfm, idev->work_digest);
1400         spin_unlock(&md5_tfm_lock);
1401
1402         memcpy(idev->rndid, &idev->work_digest[0], 8);
1403         idev->rndid[0] &= ~0x02;
1404         memcpy(idev->entropy, &idev->work_digest[8], 8);
1405
1406         /*
1407          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1408          * check if generated address is not inappropriate
1409          *
1410          *  - Reserved subnet anycast (RFC 2526)
1411          *      11111101 11....11 1xxxxxxx
1412          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1413          *      00-00-5E-FE-xx-xx-xx-xx
1414          *  - value 0
1415          *  - XXX: already assigned to an address on the device
1416          */
1417         if (idev->rndid[0] == 0xfd &&
1418             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1419             (idev->rndid[7]&0x80))
1420                 goto regen;
1421         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1422                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1423                         goto regen;
1424                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1425                         goto regen;
1426         }
1427
1428         return 0;
1429 }
1430
1431 static void ipv6_regen_rndid(unsigned long data)
1432 {
1433         struct inet6_dev *idev = (struct inet6_dev *) data;
1434         unsigned long expires;
1435
1436         read_lock_bh(&addrconf_lock);
1437         write_lock_bh(&idev->lock);
1438
1439         if (idev->dead)
1440                 goto out;
1441
1442         if (__ipv6_regen_rndid(idev) < 0)
1443                 goto out;
1444
1445         expires = jiffies +
1446                 idev->cnf.temp_prefered_lft * HZ -
1447                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1448         if (time_before(expires, jiffies)) {
1449                 printk(KERN_WARNING
1450                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1451                         idev->dev->name);
1452                 goto out;
1453         }
1454
1455         if (!mod_timer(&idev->regen_timer, expires))
1456                 in6_dev_hold(idev);
1457
1458 out:
1459         write_unlock_bh(&idev->lock);
1460         read_unlock_bh(&addrconf_lock);
1461         in6_dev_put(idev);
1462 }
1463
1464 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1465         int ret = 0;
1466
1467         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1468                 ret = __ipv6_regen_rndid(idev);
1469         return ret;
1470 }
1471 #endif
1472
1473 /*
1474  *      Add prefix route.
1475  */
1476
1477 static void
1478 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1479                       unsigned long expires, u32 flags)
1480 {
1481         struct in6_rtmsg rtmsg;
1482
1483         memset(&rtmsg, 0, sizeof(rtmsg));
1484         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1485         rtmsg.rtmsg_dst_len = plen;
1486         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1487         rtmsg.rtmsg_ifindex = dev->ifindex;
1488         rtmsg.rtmsg_info = expires;
1489         rtmsg.rtmsg_flags = RTF_UP|flags;
1490         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1491
1492         /* Prevent useless cloning on PtP SIT.
1493            This thing is done here expecting that the whole
1494            class of non-broadcast devices need not cloning.
1495          */
1496         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1497                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1498
1499         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1500 }
1501
1502 /* Create "default" multicast route to the interface */
1503
1504 static void addrconf_add_mroute(struct net_device *dev)
1505 {
1506         struct in6_rtmsg rtmsg;
1507
1508         memset(&rtmsg, 0, sizeof(rtmsg));
1509         ipv6_addr_set(&rtmsg.rtmsg_dst,
1510                       htonl(0xFF000000), 0, 0, 0);
1511         rtmsg.rtmsg_dst_len = 8;
1512         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1513         rtmsg.rtmsg_ifindex = dev->ifindex;
1514         rtmsg.rtmsg_flags = RTF_UP;
1515         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1516         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1517 }
1518
1519 static void sit_route_add(struct net_device *dev)
1520 {
1521         struct in6_rtmsg rtmsg;
1522
1523         memset(&rtmsg, 0, sizeof(rtmsg));
1524
1525         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1526         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1527
1528         /* prefix length - 96 bits "::d.d.d.d" */
1529         rtmsg.rtmsg_dst_len     = 96;
1530         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1531         rtmsg.rtmsg_ifindex     = dev->ifindex;
1532
1533         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1534 }
1535
1536 static void addrconf_add_lroute(struct net_device *dev)
1537 {
1538         struct in6_addr addr;
1539
1540         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1541         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1542 }
1543
1544 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1545 {
1546         struct inet6_dev *idev;
1547
1548         ASSERT_RTNL();
1549
1550         if ((idev = ipv6_find_idev(dev)) == NULL)
1551                 return NULL;
1552
1553         /* Add default multicast route */
1554         addrconf_add_mroute(dev);
1555
1556         /* Add link local route */
1557         addrconf_add_lroute(dev);
1558         return idev;
1559 }
1560
1561 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1562 {
1563         struct prefix_info *pinfo;
1564         __u32 valid_lft;
1565         __u32 prefered_lft;
1566         int addr_type;
1567         unsigned long rt_expires;
1568         struct inet6_dev *in6_dev;
1569
1570         pinfo = (struct prefix_info *) opt;
1571
1572         if (len < sizeof(struct prefix_info)) {
1573                 ADBG(("addrconf: prefix option too short\n"));
1574                 return;
1575         }
1576
1577         /*
1578          *      Validation checks ([ADDRCONF], page 19)
1579          */
1580
1581         addr_type = ipv6_addr_type(&pinfo->prefix);
1582
1583         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1584                 return;
1585
1586         valid_lft = ntohl(pinfo->valid);
1587         prefered_lft = ntohl(pinfo->prefered);
1588
1589         if (prefered_lft > valid_lft) {
1590                 if (net_ratelimit())
1591                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1592                 return;
1593         }
1594
1595         in6_dev = in6_dev_get(dev);
1596
1597         if (in6_dev == NULL) {
1598                 if (net_ratelimit())
1599                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1600                 return;
1601         }
1602
1603         /*
1604          *      Two things going on here:
1605          *      1) Add routes for on-link prefixes
1606          *      2) Configure prefixes with the auto flag set
1607          */
1608
1609         /* Avoid arithmetic overflow. Really, we could
1610            save rt_expires in seconds, likely valid_lft,
1611            but it would require division in fib gc, that it
1612            not good.
1613          */
1614         if (valid_lft >= 0x7FFFFFFF/HZ)
1615                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1616         else
1617                 rt_expires = valid_lft * HZ;
1618
1619         /*
1620          * We convert this (in jiffies) to clock_t later.
1621          * Avoid arithmetic overflow there as well.
1622          * Overflow can happen only if HZ < USER_HZ.
1623          */
1624         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1625                 rt_expires = 0x7FFFFFFF / USER_HZ;
1626
1627         if (pinfo->onlink) {
1628                 struct rt6_info *rt;
1629                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1630
1631                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1632                         if (rt->rt6i_flags&RTF_EXPIRES) {
1633                                 if (valid_lft == 0) {
1634                                         ip6_del_rt(rt, NULL, NULL, NULL);
1635                                         rt = NULL;
1636                                 } else {
1637                                         rt->rt6i_expires = jiffies + rt_expires;
1638                                 }
1639                         }
1640                 } else if (valid_lft) {
1641                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1642                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1643                 }
1644                 if (rt)
1645                         dst_release(&rt->u.dst);
1646         }
1647
1648         /* Try to figure out our local address for this prefix */
1649
1650         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1651                 struct inet6_ifaddr * ifp;
1652                 struct in6_addr addr;
1653                 int create = 0, update_lft = 0;
1654
1655                 if (pinfo->prefix_len == 64) {
1656                         memcpy(&addr, &pinfo->prefix, 8);
1657                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1658                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1659                                 in6_dev_put(in6_dev);
1660                                 return;
1661                         }
1662                         goto ok;
1663                 }
1664                 if (net_ratelimit())
1665                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1666                                pinfo->prefix_len);
1667                 in6_dev_put(in6_dev);
1668                 return;
1669
1670 ok:
1671
1672                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1673
1674                 if (ifp == NULL && valid_lft) {
1675                         int max_addresses = in6_dev->cnf.max_addresses;
1676
1677                         /* Do not allow to create too much of autoconfigured
1678                          * addresses; this would be too easy way to crash kernel.
1679                          */
1680                         if (!max_addresses ||
1681                             ipv6_count_addresses(in6_dev) < max_addresses)
1682                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1683                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1684
1685                         if (!ifp || IS_ERR(ifp)) {
1686                                 in6_dev_put(in6_dev);
1687                                 return;
1688                         }
1689
1690                         update_lft = create = 1;
1691                         ifp->cstamp = jiffies;
1692                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1693                 }
1694
1695                 if (ifp) {
1696                         int flags;
1697                         unsigned long now;
1698 #ifdef CONFIG_IPV6_PRIVACY
1699                         struct inet6_ifaddr *ift;
1700 #endif
1701                         u32 stored_lft;
1702
1703                         /* update lifetime (RFC2462 5.5.3 e) */
1704                         spin_lock(&ifp->lock);
1705                         now = jiffies;
1706                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1707                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1708                         else
1709                                 stored_lft = 0;
1710                         if (!update_lft && stored_lft) {
1711                                 if (valid_lft > MIN_VALID_LIFETIME ||
1712                                     valid_lft > stored_lft)
1713                                         update_lft = 1;
1714                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1715                                         /* valid_lft <= stored_lft is always true */
1716                                         /* XXX: IPsec */
1717                                         update_lft = 0;
1718                                 } else {
1719                                         valid_lft = MIN_VALID_LIFETIME;
1720                                         if (valid_lft < prefered_lft)
1721                                                 prefered_lft = valid_lft;
1722                                         update_lft = 1;
1723                                 }
1724                         }
1725
1726                         if (update_lft) {
1727                                 ifp->valid_lft = valid_lft;
1728                                 ifp->prefered_lft = prefered_lft;
1729                                 ifp->tstamp = now;
1730                                 flags = ifp->flags;
1731                                 ifp->flags &= ~IFA_F_DEPRECATED;
1732                                 spin_unlock(&ifp->lock);
1733
1734                                 if (!(flags&IFA_F_TENTATIVE))
1735                                         ipv6_ifa_notify(0, ifp);
1736                         } else
1737                                 spin_unlock(&ifp->lock);
1738
1739 #ifdef CONFIG_IPV6_PRIVACY
1740                         read_lock_bh(&in6_dev->lock);
1741                         /* update all temporary addresses in the list */
1742                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1743                                 /*
1744                                  * When adjusting the lifetimes of an existing
1745                                  * temporary address, only lower the lifetimes.
1746                                  * Implementations must not increase the
1747                                  * lifetimes of an existing temporary address
1748                                  * when processing a Prefix Information Option.
1749                                  */
1750                                 spin_lock(&ift->lock);
1751                                 flags = ift->flags;
1752                                 if (ift->valid_lft > valid_lft &&
1753                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1754                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1755                                 if (ift->prefered_lft > prefered_lft &&
1756                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1757                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1758                                 spin_unlock(&ift->lock);
1759                                 if (!(flags&IFA_F_TENTATIVE))
1760                                         ipv6_ifa_notify(0, ift);
1761                         }
1762
1763                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1764                                 /*
1765                                  * When a new public address is created as described in [ADDRCONF],
1766                                  * also create a new temporary address.
1767                                  */
1768                                 read_unlock_bh(&in6_dev->lock);
1769                                 ipv6_create_tempaddr(ifp, NULL);
1770                         } else {
1771                                 read_unlock_bh(&in6_dev->lock);
1772                         }
1773 #endif
1774                         in6_ifa_put(ifp);
1775                         addrconf_verify(0);
1776                 }
1777         }
1778         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1779         in6_dev_put(in6_dev);
1780 }
1781
1782 /*
1783  *      Set destination address.
1784  *      Special case for SIT interfaces where we create a new "virtual"
1785  *      device.
1786  */
1787 int addrconf_set_dstaddr(void __user *arg)
1788 {
1789         struct in6_ifreq ireq;
1790         struct net_device *dev;
1791         int err = -EINVAL;
1792
1793         rtnl_lock();
1794
1795         err = -EFAULT;
1796         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1797                 goto err_exit;
1798
1799         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1800
1801         err = -ENODEV;
1802         if (dev == NULL)
1803                 goto err_exit;
1804
1805         if (dev->type == ARPHRD_SIT) {
1806                 struct ifreq ifr;
1807                 mm_segment_t    oldfs;
1808                 struct ip_tunnel_parm p;
1809
1810                 err = -EADDRNOTAVAIL;
1811                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1812                         goto err_exit;
1813
1814                 memset(&p, 0, sizeof(p));
1815                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1816                 p.iph.saddr = 0;
1817                 p.iph.version = 4;
1818                 p.iph.ihl = 5;
1819                 p.iph.protocol = IPPROTO_IPV6;
1820                 p.iph.ttl = 64;
1821                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1822
1823                 oldfs = get_fs(); set_fs(KERNEL_DS);
1824                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1825                 set_fs(oldfs);
1826
1827                 if (err == 0) {
1828                         err = -ENOBUFS;
1829                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1830                                 goto err_exit;
1831                         err = dev_open(dev);
1832                 }
1833         }
1834
1835 err_exit:
1836         rtnl_unlock();
1837         return err;
1838 }
1839
1840 /*
1841  *      Manual configuration of address on an interface
1842  */
1843 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1844 {
1845         struct inet6_ifaddr *ifp;
1846         struct inet6_dev *idev;
1847         struct net_device *dev;
1848         int scope;
1849
1850         ASSERT_RTNL();
1851
1852         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1853                 return -ENODEV;
1854
1855         if (!(dev->flags&IFF_UP))
1856                 return -ENETDOWN;
1857
1858         if ((idev = addrconf_add_dev(dev)) == NULL)
1859                 return -ENOBUFS;
1860
1861         scope = ipv6_addr_scope(pfx);
1862
1863         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1864         if (!IS_ERR(ifp)) {
1865                 addrconf_dad_start(ifp, 0);
1866                 in6_ifa_put(ifp);
1867                 return 0;
1868         }
1869
1870         return PTR_ERR(ifp);
1871 }
1872
1873 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1874 {
1875         struct inet6_ifaddr *ifp;
1876         struct inet6_dev *idev;
1877         struct net_device *dev;
1878
1879         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1880                 return -ENODEV;
1881
1882         if ((idev = __in6_dev_get(dev)) == NULL)
1883                 return -ENXIO;
1884
1885         read_lock_bh(&idev->lock);
1886         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1887                 if (ifp->prefix_len == plen &&
1888                     ipv6_addr_equal(pfx, &ifp->addr)) {
1889                         in6_ifa_hold(ifp);
1890                         read_unlock_bh(&idev->lock);
1891
1892                         ipv6_del_addr(ifp);
1893
1894                         /* If the last address is deleted administratively,
1895                            disable IPv6 on this interface.
1896                          */
1897                         if (idev->addr_list == NULL)
1898                                 addrconf_ifdown(idev->dev, 1);
1899                         return 0;
1900                 }
1901         }
1902         read_unlock_bh(&idev->lock);
1903         return -EADDRNOTAVAIL;
1904 }
1905
1906
1907 int addrconf_add_ifaddr(void __user *arg)
1908 {
1909         struct in6_ifreq ireq;
1910         int err;
1911
1912         if (!capable(CAP_NET_ADMIN))
1913                 return -EPERM;
1914
1915         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1916                 return -EFAULT;
1917
1918         rtnl_lock();
1919         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1920         rtnl_unlock();
1921         return err;
1922 }
1923
1924 int addrconf_del_ifaddr(void __user *arg)
1925 {
1926         struct in6_ifreq ireq;
1927         int err;
1928
1929         if (!capable(CAP_NET_ADMIN))
1930                 return -EPERM;
1931
1932         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1933                 return -EFAULT;
1934
1935         rtnl_lock();
1936         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1937         rtnl_unlock();
1938         return err;
1939 }
1940
1941 static void sit_add_v4_addrs(struct inet6_dev *idev)
1942 {
1943         struct inet6_ifaddr * ifp;
1944         struct in6_addr addr;
1945         struct net_device *dev;
1946         int scope;
1947
1948         ASSERT_RTNL();
1949
1950         memset(&addr, 0, sizeof(struct in6_addr));
1951         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1952
1953         if (idev->dev->flags&IFF_POINTOPOINT) {
1954                 addr.s6_addr32[0] = htonl(0xfe800000);
1955                 scope = IFA_LINK;
1956         } else {
1957                 scope = IPV6_ADDR_COMPATv4;
1958         }
1959
1960         if (addr.s6_addr32[3]) {
1961                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1962                 if (!IS_ERR(ifp)) {
1963                         spin_lock_bh(&ifp->lock);
1964                         ifp->flags &= ~IFA_F_TENTATIVE;
1965                         spin_unlock_bh(&ifp->lock);
1966                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1967                         in6_ifa_put(ifp);
1968                 }
1969                 return;
1970         }
1971
1972         for (dev = dev_base; dev != NULL; dev = dev->next) {
1973                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1974                 if (in_dev && (dev->flags & IFF_UP)) {
1975                         struct in_ifaddr * ifa;
1976
1977                         int flag = scope;
1978
1979                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1980                                 int plen;
1981
1982                                 addr.s6_addr32[3] = ifa->ifa_local;
1983
1984                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1985                                         continue;
1986                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1987                                         if (idev->dev->flags&IFF_POINTOPOINT)
1988                                                 continue;
1989                                         flag |= IFA_HOST;
1990                                 }
1991                                 if (idev->dev->flags&IFF_POINTOPOINT)
1992                                         plen = 64;
1993                                 else
1994                                         plen = 96;
1995
1996                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1997                                                     IFA_F_PERMANENT);
1998                                 if (!IS_ERR(ifp)) {
1999                                         spin_lock_bh(&ifp->lock);
2000                                         ifp->flags &= ~IFA_F_TENTATIVE;
2001                                         spin_unlock_bh(&ifp->lock);
2002                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2003                                         in6_ifa_put(ifp);
2004                                 }
2005                         }
2006                 }
2007         }
2008 }
2009
2010 static void init_loopback(struct net_device *dev)
2011 {
2012         struct inet6_dev  *idev;
2013         struct inet6_ifaddr * ifp;
2014
2015         /* ::1 */
2016
2017         ASSERT_RTNL();
2018
2019         if ((idev = ipv6_find_idev(dev)) == NULL) {
2020                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2021                 return;
2022         }
2023
2024         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2025         if (!IS_ERR(ifp)) {
2026                 spin_lock_bh(&ifp->lock);
2027                 ifp->flags &= ~IFA_F_TENTATIVE;
2028                 spin_unlock_bh(&ifp->lock);
2029                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2030                 in6_ifa_put(ifp);
2031         }
2032 }
2033
2034 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2035 {
2036         struct inet6_ifaddr * ifp;
2037
2038         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2039         if (!IS_ERR(ifp)) {
2040                 addrconf_dad_start(ifp, 0);
2041                 in6_ifa_put(ifp);
2042         }
2043 }
2044
2045 static void addrconf_dev_config(struct net_device *dev)
2046 {
2047         struct in6_addr addr;
2048         struct inet6_dev    * idev;
2049
2050         ASSERT_RTNL();
2051
2052         if ((dev->type != ARPHRD_ETHER) &&
2053             (dev->type != ARPHRD_FDDI) &&
2054             (dev->type != ARPHRD_IEEE802_TR) &&
2055             (dev->type != ARPHRD_ARCNET) &&
2056             (dev->type != ARPHRD_INFINIBAND)) {
2057                 /* Alas, we support only Ethernet autoconfiguration. */
2058                 return;
2059         }
2060
2061         idev = addrconf_add_dev(dev);
2062         if (idev == NULL)
2063                 return;
2064
2065         memset(&addr, 0, sizeof(struct in6_addr));
2066         addr.s6_addr32[0] = htonl(0xFE800000);
2067
2068         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2069                 addrconf_add_linklocal(idev, &addr);
2070 }
2071
2072 static void addrconf_sit_config(struct net_device *dev)
2073 {
2074         struct inet6_dev *idev;
2075
2076         ASSERT_RTNL();
2077
2078         /*
2079          * Configure the tunnel with one of our IPv4
2080          * addresses... we should configure all of
2081          * our v4 addrs in the tunnel
2082          */
2083
2084         if ((idev = ipv6_find_idev(dev)) == NULL) {
2085                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2086                 return;
2087         }
2088
2089         sit_add_v4_addrs(idev);
2090
2091         if (dev->flags&IFF_POINTOPOINT) {
2092                 addrconf_add_mroute(dev);
2093                 addrconf_add_lroute(dev);
2094         } else
2095                 sit_route_add(dev);
2096 }
2097
2098 static inline int
2099 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2100 {
2101         struct in6_addr lladdr;
2102
2103         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2104                 addrconf_add_linklocal(idev, &lladdr);
2105                 return 0;
2106         }
2107         return -1;
2108 }
2109
2110 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2111 {
2112         struct net_device *link_dev;
2113
2114         /* first try to inherit the link-local address from the link device */
2115         if (idev->dev->iflink &&
2116             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2117                 if (!ipv6_inherit_linklocal(idev, link_dev))
2118                         return;
2119         }
2120         /* then try to inherit it from any device */
2121         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2122                 if (!ipv6_inherit_linklocal(idev, link_dev))
2123                         return;
2124         }
2125         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2126 }
2127
2128 /*
2129  * Autoconfigure tunnel with a link-local address so routing protocols,
2130  * DHCPv6, MLD etc. can be run over the virtual link
2131  */
2132
2133 static void addrconf_ip6_tnl_config(struct net_device *dev)
2134 {
2135         struct inet6_dev *idev;
2136
2137         ASSERT_RTNL();
2138
2139         if ((idev = addrconf_add_dev(dev)) == NULL) {
2140                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2141                 return;
2142         }
2143         ip6_tnl_add_linklocal(idev);
2144         addrconf_add_mroute(dev);
2145 }
2146
2147 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2148                            void * data)
2149 {
2150         struct net_device *dev = (struct net_device *) data;
2151         struct inet6_dev *idev = __in6_dev_get(dev);
2152         int run_pending = 0;
2153
2154         switch(event) {
2155         case NETDEV_UP:
2156         case NETDEV_CHANGE:
2157                 if (event == NETDEV_UP) {
2158                         if (!netif_carrier_ok(dev)) {
2159                                 /* device is not ready yet. */
2160                                 printk(KERN_INFO
2161                                         "ADDRCONF(NETDEV_UP): %s: "
2162                                         "link is not ready\n",
2163                                         dev->name);
2164                                 break;
2165                         }
2166                 } else {
2167                         if (!netif_carrier_ok(dev)) {
2168                                 /* device is still not ready. */
2169                                 break;
2170                         }
2171
2172                         if (idev) {
2173                                 if (idev->if_flags & IF_READY) {
2174                                         /* device is already configured. */
2175                                         break;
2176                                 }
2177                                 idev->if_flags |= IF_READY;
2178                         }
2179
2180                         printk(KERN_INFO
2181                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2182                                         "link becomes ready\n",
2183                                         dev->name);
2184
2185                         run_pending = 1;
2186                 }
2187
2188                 switch(dev->type) {
2189                 case ARPHRD_SIT:
2190                         addrconf_sit_config(dev);
2191                         break;
2192                 case ARPHRD_TUNNEL6:
2193                         addrconf_ip6_tnl_config(dev);
2194                         break;
2195                 case ARPHRD_LOOPBACK:
2196                         init_loopback(dev);
2197                         break;
2198
2199                 default:
2200                         addrconf_dev_config(dev);
2201                         break;
2202                 };
2203                 if (idev) {
2204                         if (run_pending)
2205                                 addrconf_dad_run(idev);
2206
2207                         /* If the MTU changed during the interface down, when the
2208                            interface up, the changed MTU must be reflected in the
2209                            idev as well as routers.
2210                          */
2211                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2212                                 rt6_mtu_change(dev, dev->mtu);
2213                                 idev->cnf.mtu6 = dev->mtu;
2214                         }
2215                         idev->tstamp = jiffies;
2216                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2217                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2218                            stop IPv6 on this interface.
2219                          */
2220                         if (dev->mtu < IPV6_MIN_MTU)
2221                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2222                 }
2223                 break;
2224
2225         case NETDEV_CHANGEMTU:
2226                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2227                         rt6_mtu_change(dev, dev->mtu);
2228                         idev->cnf.mtu6 = dev->mtu;
2229                         break;
2230                 }
2231
2232                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2233
2234         case NETDEV_DOWN:
2235         case NETDEV_UNREGISTER:
2236                 /*
2237                  *      Remove all addresses from this interface.
2238                  */
2239                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2240                 break;
2241
2242         case NETDEV_CHANGENAME:
2243 #ifdef CONFIG_SYSCTL
2244                 if (idev) {
2245                         addrconf_sysctl_unregister(&idev->cnf);
2246                         neigh_sysctl_unregister(idev->nd_parms);
2247                         neigh_sysctl_register(dev, idev->nd_parms,
2248                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2249                                               &ndisc_ifinfo_sysctl_change,
2250                                               NULL);
2251                         addrconf_sysctl_register(idev, &idev->cnf);
2252                 }
2253 #endif
2254                 break;
2255         };
2256
2257         return NOTIFY_OK;
2258 }
2259
2260 /*
2261  *      addrconf module should be notified of a device going up
2262  */
2263 static struct notifier_block ipv6_dev_notf = {
2264         .notifier_call = addrconf_notify,
2265         .priority = 0
2266 };
2267
2268 static int addrconf_ifdown(struct net_device *dev, int how)
2269 {
2270         struct inet6_dev *idev;
2271         struct inet6_ifaddr *ifa, **bifa;
2272         int i;
2273
2274         ASSERT_RTNL();
2275
2276         if (dev == &loopback_dev && how == 1)
2277                 how = 0;
2278
2279         rt6_ifdown(dev);
2280         neigh_ifdown(&nd_tbl, dev);
2281
2282         idev = __in6_dev_get(dev);
2283         if (idev == NULL)
2284                 return -ENODEV;
2285
2286         /* Step 1: remove reference to ipv6 device from parent device.
2287                    Do not dev_put!
2288          */
2289         if (how == 1) {
2290                 write_lock_bh(&addrconf_lock);
2291                 dev->ip6_ptr = NULL;
2292                 idev->dead = 1;
2293                 write_unlock_bh(&addrconf_lock);
2294
2295                 /* Step 1.5: remove snmp6 entry */
2296                 snmp6_unregister_dev(idev);
2297
2298         }
2299
2300         /* Step 2: clear hash table */
2301         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2302                 bifa = &inet6_addr_lst[i];
2303
2304                 write_lock_bh(&addrconf_hash_lock);
2305                 while ((ifa = *bifa) != NULL) {
2306                         if (ifa->idev == idev) {
2307                                 *bifa = ifa->lst_next;
2308                                 ifa->lst_next = NULL;
2309                                 addrconf_del_timer(ifa);
2310                                 in6_ifa_put(ifa);
2311                                 continue;
2312                         }
2313                         bifa = &ifa->lst_next;
2314                 }
2315                 write_unlock_bh(&addrconf_hash_lock);
2316         }
2317
2318         write_lock_bh(&idev->lock);
2319
2320         /* Step 3: clear flags for stateless addrconf */
2321         if (how != 1)
2322                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2323
2324         /* Step 4: clear address list */
2325 #ifdef CONFIG_IPV6_PRIVACY
2326         if (how == 1 && del_timer(&idev->regen_timer))
2327                 in6_dev_put(idev);
2328
2329         /* clear tempaddr list */
2330         while ((ifa = idev->tempaddr_list) != NULL) {
2331                 idev->tempaddr_list = ifa->tmp_next;
2332                 ifa->tmp_next = NULL;
2333                 ifa->dead = 1;
2334                 write_unlock_bh(&idev->lock);
2335                 spin_lock_bh(&ifa->lock);
2336
2337                 if (ifa->ifpub) {
2338                         in6_ifa_put(ifa->ifpub);
2339                         ifa->ifpub = NULL;
2340                 }
2341                 spin_unlock_bh(&ifa->lock);
2342                 in6_ifa_put(ifa);
2343                 write_lock_bh(&idev->lock);
2344         }
2345 #endif
2346         while ((ifa = idev->addr_list) != NULL) {
2347                 idev->addr_list = ifa->if_next;
2348                 ifa->if_next = NULL;
2349                 ifa->dead = 1;
2350                 addrconf_del_timer(ifa);
2351                 write_unlock_bh(&idev->lock);
2352
2353                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2354                 in6_ifa_put(ifa);
2355
2356                 write_lock_bh(&idev->lock);
2357         }
2358         write_unlock_bh(&idev->lock);
2359
2360         /* Step 5: Discard multicast list */
2361
2362         if (how == 1)
2363                 ipv6_mc_destroy_dev(idev);
2364         else
2365                 ipv6_mc_down(idev);
2366
2367         /* Step 5: netlink notification of this interface */
2368         idev->tstamp = jiffies;
2369         inet6_ifinfo_notify(RTM_DELLINK, idev);
2370
2371         /* Shot the device (if unregistered) */
2372
2373         if (how == 1) {
2374 #ifdef CONFIG_SYSCTL
2375                 addrconf_sysctl_unregister(&idev->cnf);
2376                 neigh_sysctl_unregister(idev->nd_parms);
2377 #endif
2378                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2379                 neigh_ifdown(&nd_tbl, dev);
2380                 in6_dev_put(idev);
2381         }
2382         return 0;
2383 }
2384
2385 static void addrconf_rs_timer(unsigned long data)
2386 {
2387         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2388
2389         if (ifp->idev->cnf.forwarding)
2390                 goto out;
2391
2392         if (ifp->idev->if_flags & IF_RA_RCVD) {
2393                 /*
2394                  *      Announcement received after solicitation
2395                  *      was sent
2396                  */
2397                 goto out;
2398         }
2399
2400         spin_lock(&ifp->lock);
2401         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2402                 struct in6_addr all_routers;
2403
2404                 /* The wait after the last probe can be shorter */
2405                 addrconf_mod_timer(ifp, AC_RS,
2406                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2407                                    ifp->idev->cnf.rtr_solicit_delay :
2408                                    ifp->idev->cnf.rtr_solicit_interval);
2409                 spin_unlock(&ifp->lock);
2410
2411                 ipv6_addr_all_routers(&all_routers);
2412
2413                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2414         } else {
2415                 spin_unlock(&ifp->lock);
2416                 /*
2417                  * Note: we do not support deprecated "all on-link"
2418                  * assumption any longer.
2419                  */
2420                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2421                        ifp->idev->dev->name);
2422         }
2423
2424 out:
2425         in6_ifa_put(ifp);
2426 }
2427
2428 /*
2429  *      Duplicate Address Detection
2430  */
2431 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2432 {
2433         unsigned long rand_num;
2434         struct inet6_dev *idev = ifp->idev;
2435
2436         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2437         ifp->probes = idev->cnf.dad_transmits;
2438         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2439 }
2440
2441 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2442 {
2443         struct inet6_dev *idev = ifp->idev;
2444         struct net_device *dev = idev->dev;
2445
2446         addrconf_join_solict(dev, &ifp->addr);
2447
2448         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2449                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2450                                         flags);
2451
2452         net_srandom(ifp->addr.s6_addr32[3]);
2453
2454         read_lock_bh(&idev->lock);
2455         if (ifp->dead)
2456                 goto out;
2457         spin_lock_bh(&ifp->lock);
2458
2459         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2460             !(ifp->flags&IFA_F_TENTATIVE)) {
2461                 ifp->flags &= ~IFA_F_TENTATIVE;
2462                 spin_unlock_bh(&ifp->lock);
2463                 read_unlock_bh(&idev->lock);
2464
2465                 addrconf_dad_completed(ifp);
2466                 return;
2467         }
2468
2469         if (idev->if_flags & IF_READY)
2470                 addrconf_dad_kick(ifp);
2471         else {
2472                 /*
2473                  * If the defice is not ready:
2474                  * - keep it tentative if it is a permanent address.
2475                  * - otherwise, kill it.
2476                  */
2477                 in6_ifa_hold(ifp);
2478                 addrconf_dad_stop(ifp);
2479         }
2480
2481         spin_unlock_bh(&ifp->lock);
2482 out:
2483         read_unlock_bh(&idev->lock);
2484 }
2485
2486 static void addrconf_dad_timer(unsigned long data)
2487 {
2488         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2489         struct inet6_dev *idev = ifp->idev;
2490         struct in6_addr unspec;
2491         struct in6_addr mcaddr;
2492
2493         read_lock_bh(&idev->lock);
2494         if (idev->dead) {
2495                 read_unlock_bh(&idev->lock);
2496                 goto out;
2497         }
2498         spin_lock_bh(&ifp->lock);
2499         if (ifp->probes == 0) {
2500                 /*
2501                  * DAD was successful
2502                  */
2503
2504                 ifp->flags &= ~IFA_F_TENTATIVE;
2505                 spin_unlock_bh(&ifp->lock);
2506                 read_unlock_bh(&idev->lock);
2507
2508                 addrconf_dad_completed(ifp);
2509
2510                 goto out;
2511         }
2512
2513         ifp->probes--;
2514         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2515         spin_unlock_bh(&ifp->lock);
2516         read_unlock_bh(&idev->lock);
2517
2518         /* send a neighbour solicitation for our addr */
2519         memset(&unspec, 0, sizeof(unspec));
2520         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2521         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2522 out:
2523         in6_ifa_put(ifp);
2524 }
2525
2526 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2527 {
2528         struct net_device *     dev = ifp->idev->dev;
2529
2530         /*
2531          *      Configure the address for reception. Now it is valid.
2532          */
2533
2534         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2535
2536         /* If added prefix is link local and forwarding is off,
2537            start sending router solicitations.
2538          */
2539
2540         if (ifp->idev->cnf.forwarding == 0 &&
2541             ifp->idev->cnf.rtr_solicits > 0 &&
2542             (dev->flags&IFF_LOOPBACK) == 0 &&
2543             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2544                 struct in6_addr all_routers;
2545
2546                 ipv6_addr_all_routers(&all_routers);
2547
2548                 /*
2549                  *      If a host as already performed a random delay
2550                  *      [...] as part of DAD [...] there is no need
2551                  *      to delay again before sending the first RS
2552                  */
2553                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2554
2555                 spin_lock_bh(&ifp->lock);
2556                 ifp->probes = 1;
2557                 ifp->idev->if_flags |= IF_RS_SENT;
2558                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2559                 spin_unlock_bh(&ifp->lock);
2560         }
2561 }
2562
2563 static void addrconf_dad_run(struct inet6_dev *idev) {
2564         struct inet6_ifaddr *ifp;
2565
2566         read_lock_bh(&idev->lock);
2567         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2568                 spin_lock_bh(&ifp->lock);
2569                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2570                         spin_unlock_bh(&ifp->lock);
2571                         continue;
2572                 }
2573                 spin_unlock_bh(&ifp->lock);
2574                 addrconf_dad_kick(ifp);
2575         }
2576         read_unlock_bh(&idev->lock);
2577 }
2578
2579 #ifdef CONFIG_PROC_FS
2580 struct if6_iter_state {
2581         int bucket;
2582 };
2583
2584 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2585 {
2586         struct inet6_ifaddr *ifa = NULL;
2587         struct if6_iter_state *state = seq->private;
2588
2589         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2590                 ifa = inet6_addr_lst[state->bucket];
2591                 if (ifa)
2592                         break;
2593         }
2594         return ifa;
2595 }
2596
2597 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2598 {
2599         struct if6_iter_state *state = seq->private;
2600
2601         ifa = ifa->lst_next;
2602 try_again:
2603         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2604                 ifa = inet6_addr_lst[state->bucket];
2605                 goto try_again;
2606         }
2607         return ifa;
2608 }
2609
2610 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2611 {
2612         struct inet6_ifaddr *ifa = if6_get_first(seq);
2613
2614         if (ifa)
2615                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2616                         --pos;
2617         return pos ? NULL : ifa;
2618 }
2619
2620 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2621 {
2622         read_lock_bh(&addrconf_hash_lock);
2623         return if6_get_idx(seq, *pos);
2624 }
2625
2626 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2627 {
2628         struct inet6_ifaddr *ifa;
2629
2630         ifa = if6_get_next(seq, v);
2631         ++*pos;
2632         return ifa;
2633 }
2634
2635 static void if6_seq_stop(struct seq_file *seq, void *v)
2636 {
2637         read_unlock_bh(&addrconf_hash_lock);
2638 }
2639
2640 static int if6_seq_show(struct seq_file *seq, void *v)
2641 {
2642         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2643         seq_printf(seq,
2644                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2645                    NIP6(ifp->addr),
2646                    ifp->idev->dev->ifindex,
2647                    ifp->prefix_len,
2648                    ifp->scope,
2649                    ifp->flags,
2650                    ifp->idev->dev->name);
2651         return 0;
2652 }
2653
2654 static struct seq_operations if6_seq_ops = {
2655         .start  = if6_seq_start,
2656         .next   = if6_seq_next,
2657         .show   = if6_seq_show,
2658         .stop   = if6_seq_stop,
2659 };
2660
2661 static int if6_seq_open(struct inode *inode, struct file *file)
2662 {
2663         struct seq_file *seq;
2664         int rc = -ENOMEM;
2665         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2666
2667         if (!s)
2668                 goto out;
2669         memset(s, 0, sizeof(*s));
2670
2671         rc = seq_open(file, &if6_seq_ops);
2672         if (rc)
2673                 goto out_kfree;
2674
2675         seq = file->private_data;
2676         seq->private = s;
2677 out:
2678         return rc;
2679 out_kfree:
2680         kfree(s);
2681         goto out;
2682 }
2683
2684 static struct file_operations if6_fops = {
2685         .owner          = THIS_MODULE,
2686         .open           = if6_seq_open,
2687         .read           = seq_read,
2688         .llseek         = seq_lseek,
2689         .release        = seq_release_private,
2690 };
2691
2692 int __init if6_proc_init(void)
2693 {
2694         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2695                 return -ENOMEM;
2696         return 0;
2697 }
2698
2699 void if6_proc_exit(void)
2700 {
2701         proc_net_remove("if_inet6");
2702 }
2703 #endif  /* CONFIG_PROC_FS */
2704
2705 /*
2706  *      Periodic address status verification
2707  */
2708
2709 static void addrconf_verify(unsigned long foo)
2710 {
2711         struct inet6_ifaddr *ifp;
2712         unsigned long now, next;
2713         int i;
2714
2715         spin_lock_bh(&addrconf_verify_lock);
2716         now = jiffies;
2717         next = now + ADDR_CHECK_FREQUENCY;
2718
2719         del_timer(&addr_chk_timer);
2720
2721         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2722
2723 restart:
2724                 read_lock(&addrconf_hash_lock);
2725                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2726                         unsigned long age;
2727 #ifdef CONFIG_IPV6_PRIVACY
2728                         unsigned long regen_advance;
2729 #endif
2730
2731                         if (ifp->flags & IFA_F_PERMANENT)
2732                                 continue;
2733
2734                         spin_lock(&ifp->lock);
2735                         age = (now - ifp->tstamp) / HZ;
2736
2737 #ifdef CONFIG_IPV6_PRIVACY
2738                         regen_advance = ifp->idev->cnf.regen_max_retry *
2739                                         ifp->idev->cnf.dad_transmits *
2740                                         ifp->idev->nd_parms->retrans_time / HZ;
2741 #endif
2742
2743                         if (age >= ifp->valid_lft) {
2744                                 spin_unlock(&ifp->lock);
2745                                 in6_ifa_hold(ifp);
2746                                 read_unlock(&addrconf_hash_lock);
2747                                 ipv6_del_addr(ifp);
2748                                 goto restart;
2749                         } else if (age >= ifp->prefered_lft) {
2750                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2751                                 int deprecate = 0;
2752
2753                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2754                                         deprecate = 1;
2755                                         ifp->flags |= IFA_F_DEPRECATED;
2756                                 }
2757
2758                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2759                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2760
2761                                 spin_unlock(&ifp->lock);
2762
2763                                 if (deprecate) {
2764                                         in6_ifa_hold(ifp);
2765                                         read_unlock(&addrconf_hash_lock);
2766
2767                                         ipv6_ifa_notify(0, ifp);
2768                                         in6_ifa_put(ifp);
2769                                         goto restart;
2770                                 }
2771 #ifdef CONFIG_IPV6_PRIVACY
2772                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2773                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2774                                 if (age >= ifp->prefered_lft - regen_advance) {
2775                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2776                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2777                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2778                                         if (!ifp->regen_count && ifpub) {
2779                                                 ifp->regen_count++;
2780                                                 in6_ifa_hold(ifp);
2781                                                 in6_ifa_hold(ifpub);
2782                                                 spin_unlock(&ifp->lock);
2783                                                 read_unlock(&addrconf_hash_lock);
2784                                                 ipv6_create_tempaddr(ifpub, ifp);
2785                                                 in6_ifa_put(ifpub);
2786                                                 in6_ifa_put(ifp);
2787                                                 goto restart;
2788                                         }
2789                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2790                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2791                                 spin_unlock(&ifp->lock);
2792 #endif
2793                         } else {
2794                                 /* ifp->prefered_lft <= ifp->valid_lft */
2795                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2796                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2797                                 spin_unlock(&ifp->lock);
2798                         }
2799                 }
2800                 read_unlock(&addrconf_hash_lock);
2801         }
2802
2803         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2804         add_timer(&addr_chk_timer);
2805         spin_unlock_bh(&addrconf_verify_lock);
2806 }
2807
2808 static int
2809 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2810 {
2811         struct rtattr **rta = arg;
2812         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2813         struct in6_addr *pfx;
2814
2815         pfx = NULL;
2816         if (rta[IFA_ADDRESS-1]) {
2817                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2818                         return -EINVAL;
2819                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2820         }
2821         if (rta[IFA_LOCAL-1]) {
2822                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2823                         return -EINVAL;
2824                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2825         }
2826         if (pfx == NULL)
2827                 return -EINVAL;
2828
2829         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2830 }
2831
2832 static int
2833 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2834 {
2835         struct rtattr  **rta = arg;
2836         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2837         struct in6_addr *pfx;
2838
2839         pfx = NULL;
2840         if (rta[IFA_ADDRESS-1]) {
2841                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2842                         return -EINVAL;
2843                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2844         }
2845         if (rta[IFA_LOCAL-1]) {
2846                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2847                         return -EINVAL;
2848                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2849         }
2850         if (pfx == NULL)
2851                 return -EINVAL;
2852
2853         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2854 }
2855
2856 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2857                              u32 pid, u32 seq, int event, unsigned int flags)
2858 {
2859         struct ifaddrmsg *ifm;
2860         struct nlmsghdr  *nlh;
2861         struct ifa_cacheinfo ci;
2862         unsigned char    *b = skb->tail;
2863
2864         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2865         ifm = NLMSG_DATA(nlh);
2866         ifm->ifa_family = AF_INET6;
2867         ifm->ifa_prefixlen = ifa->prefix_len;
2868         ifm->ifa_flags = ifa->flags;
2869         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2870         if (ifa->scope&IFA_HOST)
2871                 ifm->ifa_scope = RT_SCOPE_HOST;
2872         else if (ifa->scope&IFA_LINK)
2873                 ifm->ifa_scope = RT_SCOPE_LINK;
2874         else if (ifa->scope&IFA_SITE)
2875                 ifm->ifa_scope = RT_SCOPE_SITE;
2876         ifm->ifa_index = ifa->idev->dev->ifindex;
2877         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2878         if (!(ifa->flags&IFA_F_PERMANENT)) {
2879                 ci.ifa_prefered = ifa->prefered_lft;
2880                 ci.ifa_valid = ifa->valid_lft;
2881                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2882                         long tval = (jiffies - ifa->tstamp)/HZ;
2883                         ci.ifa_prefered -= tval;
2884                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2885                                 ci.ifa_valid -= tval;
2886                 }
2887         } else {
2888                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2889                 ci.ifa_valid = INFINITY_LIFE_TIME;
2890         }
2891         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2892                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2893         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2894                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2895         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2896         nlh->nlmsg_len = skb->tail - b;
2897         return skb->len;
2898
2899 nlmsg_failure:
2900 rtattr_failure:
2901         skb_trim(skb, b - skb->data);
2902         return -1;
2903 }
2904
2905 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2906                                 u32 pid, u32 seq, int event, u16 flags)
2907 {
2908         struct ifaddrmsg *ifm;
2909         struct nlmsghdr  *nlh;
2910         struct ifa_cacheinfo ci;
2911         unsigned char    *b = skb->tail;
2912
2913         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2914         ifm = NLMSG_DATA(nlh);
2915         ifm->ifa_family = AF_INET6;
2916         ifm->ifa_prefixlen = 128;
2917         ifm->ifa_flags = IFA_F_PERMANENT;
2918         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2919         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2920                 ifm->ifa_scope = RT_SCOPE_SITE;
2921         ifm->ifa_index = ifmca->idev->dev->ifindex;
2922         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2923         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2924                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2925                     * 100 / HZ);
2926         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2927                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2928                     * 100 / HZ);
2929         ci.ifa_prefered = INFINITY_LIFE_TIME;
2930         ci.ifa_valid = INFINITY_LIFE_TIME;
2931         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2932         nlh->nlmsg_len = skb->tail - b;
2933         return skb->len;
2934
2935 nlmsg_failure:
2936 rtattr_failure:
2937         skb_trim(skb, b - skb->data);
2938         return -1;
2939 }
2940
2941 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2942                                 u32 pid, u32 seq, int event, unsigned int flags)
2943 {
2944         struct ifaddrmsg *ifm;
2945         struct nlmsghdr  *nlh;
2946         struct ifa_cacheinfo ci;
2947         unsigned char    *b = skb->tail;
2948
2949         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2950         ifm = NLMSG_DATA(nlh);
2951         ifm->ifa_family = AF_INET6;
2952         ifm->ifa_prefixlen = 128;
2953         ifm->ifa_flags = IFA_F_PERMANENT;
2954         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2955         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2956                 ifm->ifa_scope = RT_SCOPE_SITE;
2957         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2958         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2959         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2960                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2961                     * 100 / HZ);
2962         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2963                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2964                     * 100 / HZ);
2965         ci.ifa_prefered = INFINITY_LIFE_TIME;
2966         ci.ifa_valid = INFINITY_LIFE_TIME;
2967         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2968         nlh->nlmsg_len = skb->tail - b;
2969         return skb->len;
2970
2971 nlmsg_failure:
2972 rtattr_failure:
2973         skb_trim(skb, b - skb->data);
2974         return -1;
2975 }
2976
2977 enum addr_type_t
2978 {
2979         UNICAST_ADDR,
2980         MULTICAST_ADDR,
2981         ANYCAST_ADDR,
2982 };
2983
2984 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2985                            enum addr_type_t type)
2986 {
2987         int idx, ip_idx;
2988         int s_idx, s_ip_idx;
2989         int err = 1;
2990         struct net_device *dev;
2991         struct inet6_dev *idev = NULL;
2992         struct inet6_ifaddr *ifa;
2993         struct ifmcaddr6 *ifmca;
2994         struct ifacaddr6 *ifaca;
2995
2996         s_idx = cb->args[0];
2997         s_ip_idx = ip_idx = cb->args[1];
2998         read_lock(&dev_base_lock);
2999
3000         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3001                 if (idx < s_idx)
3002                         continue;
3003                 if (idx > s_idx)
3004                         s_ip_idx = 0;
3005                 ip_idx = 0;
3006                 if ((idev = in6_dev_get(dev)) == NULL)
3007                         continue;
3008                 read_lock_bh(&idev->lock);
3009                 switch (type) {
3010                 case UNICAST_ADDR:
3011                         /* unicast address incl. temp addr */
3012                         for (ifa = idev->addr_list; ifa;
3013                              ifa = ifa->if_next, ip_idx++) {
3014                                 if (ip_idx < s_ip_idx)
3015                                         continue;
3016                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3017                                     NETLINK_CB(cb->skb).pid,
3018                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3019                                     NLM_F_MULTI)) <= 0)
3020                                         goto done;
3021                         }
3022                         break;
3023                 case MULTICAST_ADDR:
3024                         /* multicast address */
3025                         for (ifmca = idev->mc_list; ifmca;
3026                              ifmca = ifmca->next, ip_idx++) {
3027                                 if (ip_idx < s_ip_idx)
3028                                         continue;
3029                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3030                                     NETLINK_CB(cb->skb).pid,
3031                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3032                                     NLM_F_MULTI)) <= 0)
3033                                         goto done;
3034                         }
3035                         break;
3036                 case ANYCAST_ADDR:
3037                         /* anycast address */
3038                         for (ifaca = idev->ac_list; ifaca;
3039                              ifaca = ifaca->aca_next, ip_idx++) {
3040                                 if (ip_idx < s_ip_idx)
3041                                         continue;
3042                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3043                                     NETLINK_CB(cb->skb).pid,
3044                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3045                                     NLM_F_MULTI)) <= 0)
3046                                         goto done;
3047                         }
3048                         break;
3049                 default:
3050                         break;
3051                 }
3052                 read_unlock_bh(&idev->lock);
3053                 in6_dev_put(idev);
3054         }
3055 done:
3056         if (err <= 0) {
3057                 read_unlock_bh(&idev->lock);
3058                 in6_dev_put(idev);
3059         }
3060         read_unlock(&dev_base_lock);
3061         cb->args[0] = idx;
3062         cb->args[1] = ip_idx;
3063         return skb->len;
3064 }
3065
3066 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3067 {
3068         enum addr_type_t type = UNICAST_ADDR;
3069         return inet6_dump_addr(skb, cb, type);
3070 }
3071
3072 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3073 {
3074         enum addr_type_t type = MULTICAST_ADDR;
3075         return inet6_dump_addr(skb, cb, type);
3076 }
3077
3078
3079 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3080 {
3081         enum addr_type_t type = ANYCAST_ADDR;
3082         return inet6_dump_addr(skb, cb, type);
3083 }
3084
3085 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3086 {
3087         struct sk_buff *skb;
3088         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3089
3090         skb = alloc_skb(size, GFP_ATOMIC);
3091         if (!skb) {
3092                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3093                 return;
3094         }
3095         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3096                 kfree_skb(skb);
3097                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3098                 return;
3099         }
3100         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3101         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3102 }
3103
3104 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3105                                 __s32 *array, int bytes)
3106 {
3107         memset(array, 0, bytes);
3108         array[DEVCONF_FORWARDING] = cnf->forwarding;
3109         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3110         array[DEVCONF_MTU6] = cnf->mtu6;
3111         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3112         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3113         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3114         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3115         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3116         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3117         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3118         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3119 #ifdef CONFIG_IPV6_PRIVACY
3120         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3121         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3122         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3123         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3124         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3125 #endif
3126         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3127 }
3128
3129 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3130                              u32 pid, u32 seq, int event, unsigned int flags)
3131 {
3132         struct net_device       *dev = idev->dev;
3133         __s32                   *array = NULL;
3134         struct ifinfomsg        *r;
3135         struct nlmsghdr         *nlh;
3136         unsigned char           *b = skb->tail;
3137         struct rtattr           *subattr;
3138         __u32                   mtu = dev->mtu;
3139         struct ifla_cacheinfo   ci;
3140
3141         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3142         r = NLMSG_DATA(nlh);
3143         r->ifi_family = AF_INET6;
3144         r->__ifi_pad = 0;
3145         r->ifi_type = dev->type;
3146         r->ifi_index = dev->ifindex;
3147         r->ifi_flags = dev_get_flags(dev);
3148         r->ifi_change = 0;
3149
3150         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3151
3152         if (dev->addr_len)
3153                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3154
3155         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3156         if (dev->ifindex != dev->iflink)
3157                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3158
3159         subattr = (struct rtattr*)skb->tail;
3160
3161         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3162
3163         /* return the device flags */
3164         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3165
3166         /* return interface cacheinfo */
3167         ci.max_reasm_len = IPV6_MAXPLEN;
3168         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3169                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3170         ci.reachable_time = idev->nd_parms->reachable_time;
3171         ci.retrans_time = idev->nd_parms->retrans_time;
3172         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3173
3174         /* return the device sysctl params */
3175         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3176                 goto rtattr_failure;
3177         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3178         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3179
3180         /* XXX - Statistics/MC not implemented */
3181         subattr->rta_len = skb->tail - (u8*)subattr;
3182
3183         nlh->nlmsg_len = skb->tail - b;
3184         kfree(array);
3185         return skb->len;
3186
3187 nlmsg_failure:
3188 rtattr_failure:
3189         kfree(array);
3190         skb_trim(skb, b - skb->data);
3191         return -1;
3192 }
3193
3194 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3195 {
3196         int idx, err;
3197         int s_idx = cb->args[0];
3198         struct net_device *dev;
3199         struct inet6_dev *idev;
3200
3201         read_lock(&dev_base_lock);
3202         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3203                 if (idx < s_idx)
3204                         continue;
3205                 if ((idev = in6_dev_get(dev)) == NULL)
3206                         continue;
3207                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3208                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3209                 in6_dev_put(idev);
3210                 if (err <= 0)
3211                         break;
3212         }
3213         read_unlock(&dev_base_lock);
3214         cb->args[0] = idx;
3215
3216         return skb->len;
3217 }
3218
3219 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3220 {
3221         struct sk_buff *skb;
3222         /* 128 bytes ?? */
3223         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3224
3225         skb = alloc_skb(size, GFP_ATOMIC);
3226         if (!skb) {
3227                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3228                 return;
3229         }
3230         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3231                 kfree_skb(skb);
3232                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3233                 return;
3234         }
3235         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3236         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3237 }
3238
3239 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3240                         struct prefix_info *pinfo, u32 pid, u32 seq,
3241                         int event, unsigned int flags)
3242 {
3243         struct prefixmsg        *pmsg;
3244         struct nlmsghdr         *nlh;
3245         unsigned char           *b = skb->tail;
3246         struct prefix_cacheinfo ci;
3247
3248         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3249         pmsg = NLMSG_DATA(nlh);
3250         pmsg->prefix_family = AF_INET6;
3251         pmsg->prefix_pad1 = 0;
3252         pmsg->prefix_pad2 = 0;
3253         pmsg->prefix_ifindex = idev->dev->ifindex;
3254         pmsg->prefix_len = pinfo->prefix_len;
3255         pmsg->prefix_type = pinfo->type;
3256         pmsg->prefix_pad3 = 0;
3257
3258         pmsg->prefix_flags = 0;
3259         if (pinfo->onlink)
3260                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3261         if (pinfo->autoconf)
3262                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3263
3264         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3265
3266         ci.preferred_time = ntohl(pinfo->prefered);
3267         ci.valid_time = ntohl(pinfo->valid);
3268         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3269
3270         nlh->nlmsg_len = skb->tail - b;
3271         return skb->len;
3272
3273 nlmsg_failure:
3274 rtattr_failure:
3275         skb_trim(skb, b - skb->data);
3276         return -1;
3277 }
3278
3279 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3280                          struct prefix_info *pinfo)
3281 {
3282         struct sk_buff *skb;
3283         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3284
3285         skb = alloc_skb(size, GFP_ATOMIC);
3286         if (!skb) {
3287                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3288                 return;
3289         }
3290         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3291                 kfree_skb(skb);
3292                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3293                 return;
3294         }
3295         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3296         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3297 }
3298
3299 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3300         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3301         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3302         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3303         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3304         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3305         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3306         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3307         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3308         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3309                                       .dumpit   = inet6_dump_fib, },
3310 };
3311
3312 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3313 {
3314         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3315
3316         switch (event) {
3317         case RTM_NEWADDR:
3318                 dst_hold(&ifp->rt->u.dst);
3319                 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3320                         dst_release(&ifp->rt->u.dst);
3321                 if (ifp->idev->cnf.forwarding)
3322                         addrconf_join_anycast(ifp);
3323                 break;
3324         case RTM_DELADDR:
3325                 if (ifp->idev->cnf.forwarding)
3326                         addrconf_leave_anycast(ifp);
3327                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3328                 dst_hold(&ifp->rt->u.dst);
3329                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3330                         dst_free(&ifp->rt->u.dst);
3331                 else
3332                         dst_release(&ifp->rt->u.dst);
3333                 break;
3334         }
3335 }
3336
3337 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3338 {
3339         read_lock_bh(&addrconf_lock);
3340         if (likely(ifp->idev->dead == 0))
3341                 __ipv6_ifa_notify(event, ifp);
3342         read_unlock_bh(&addrconf_lock);
3343 }
3344
3345 #ifdef CONFIG_SYSCTL
3346
3347 static
3348 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3349                            void __user *buffer, size_t *lenp, loff_t *ppos)
3350 {
3351         int *valp = ctl->data;
3352         int val = *valp;
3353         int ret;
3354
3355         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3356
3357         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3358                 if (valp != &ipv6_devconf.forwarding) {
3359                         if ((!*valp) ^ (!val)) {
3360                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3361                                 if (idev == NULL)
3362                                         return ret;
3363                                 dev_forward_change(idev);
3364                         }
3365                 } else {
3366                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3367                         addrconf_forward_change();
3368                 }
3369                 if (*valp)
3370                         rt6_purge_dflt_routers();
3371         }
3372
3373         return ret;
3374 }
3375
3376 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3377                                             int __user *name, int nlen,
3378                                             void __user *oldval,
3379                                             size_t __user *oldlenp,
3380                                             void __user *newval, size_t newlen,
3381                                             void **context)
3382 {
3383         int *valp = table->data;
3384         int new;
3385
3386         if (!newval || !newlen)
3387                 return 0;
3388         if (newlen != sizeof(int))
3389                 return -EINVAL;
3390         if (get_user(new, (int __user *)newval))
3391                 return -EFAULT;
3392         if (new == *valp)
3393                 return 0;
3394         if (oldval && oldlenp) {
3395                 size_t len;
3396                 if (get_user(len, oldlenp))
3397                         return -EFAULT;
3398                 if (len) {
3399                         if (len > table->maxlen)
3400                                 len = table->maxlen;
3401                         if (copy_to_user(oldval, valp, len))
3402                                 return -EFAULT;
3403                         if (put_user(len, oldlenp))
3404                                 return -EFAULT;
3405                 }
3406         }
3407
3408         if (valp != &ipv6_devconf_dflt.forwarding) {
3409                 if (valp != &ipv6_devconf.forwarding) {
3410                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3411                         int changed;
3412                         if (unlikely(idev == NULL))
3413                                 return -ENODEV;
3414                         changed = (!*valp) ^ (!new);
3415                         *valp = new;
3416                         if (changed)
3417                                 dev_forward_change(idev);
3418                 } else {
3419                         *valp = new;
3420                         addrconf_forward_change();
3421                 }
3422
3423                 if (*valp)
3424                         rt6_purge_dflt_routers();
3425         } else
3426                 *valp = new;
3427
3428         return 1;
3429 }
3430
3431 static struct addrconf_sysctl_table
3432 {
3433         struct ctl_table_header *sysctl_header;
3434         ctl_table addrconf_vars[__NET_IPV6_MAX];
3435         ctl_table addrconf_dev[2];
3436         ctl_table addrconf_conf_dir[2];
3437         ctl_table addrconf_proto_dir[2];
3438         ctl_table addrconf_root_dir[2];
3439 } addrconf_sysctl = {
3440         .sysctl_header = NULL,
3441         .addrconf_vars = {
3442                 {
3443                         .ctl_name       =       NET_IPV6_FORWARDING,
3444                         .procname       =       "forwarding",
3445                         .data           =       &ipv6_devconf.forwarding,
3446                         .maxlen         =       sizeof(int),
3447                         .mode           =       0644,
3448                         .proc_handler   =       &addrconf_sysctl_forward,
3449                         .strategy       =       &addrconf_sysctl_forward_strategy,
3450                 },
3451                 {
3452                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3453                         .procname       =       "hop_limit",
3454                         .data           =       &ipv6_devconf.hop_limit,
3455                         .maxlen         =       sizeof(int),
3456                         .mode           =       0644,
3457                         .proc_handler   =       proc_dointvec,
3458                 },
3459                 {
3460                         .ctl_name       =       NET_IPV6_MTU,
3461                         .procname       =       "mtu",
3462                         .data           =       &ipv6_devconf.mtu6,
3463                         .maxlen         =       sizeof(int),
3464                         .mode           =       0644,
3465                         .proc_handler   =       &proc_dointvec,
3466                 },
3467                 {
3468                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3469                         .procname       =       "accept_ra",
3470                         .data           =       &ipv6_devconf.accept_ra,
3471                         .maxlen         =       sizeof(int),
3472                         .mode           =       0644,
3473                         .proc_handler   =       &proc_dointvec,
3474                 },
3475                 {
3476                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3477                         .procname       =       "accept_redirects",
3478                         .data           =       &ipv6_devconf.accept_redirects,
3479                         .maxlen         =       sizeof(int),
3480                         .mode           =       0644,
3481                         .proc_handler   =       &proc_dointvec,
3482                 },
3483                 {
3484                         .ctl_name       =       NET_IPV6_AUTOCONF,
3485                         .procname       =       "autoconf",
3486                         .data           =       &ipv6_devconf.autoconf,
3487                         .maxlen         =       sizeof(int),
3488                         .mode           =       0644,
3489                         .proc_handler   =       &proc_dointvec,
3490                 },
3491                 {
3492                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3493                         .procname       =       "dad_transmits",
3494                         .data           =       &ipv6_devconf.dad_transmits,
3495                         .maxlen         =       sizeof(int),
3496                         .mode           =       0644,
3497                         .proc_handler   =       &proc_dointvec,
3498                 },
3499                 {
3500                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3501                         .procname       =       "router_solicitations",
3502                         .data           =       &ipv6_devconf.rtr_solicits,
3503                         .maxlen         =       sizeof(int),
3504                         .mode           =       0644,
3505                         .proc_handler   =       &proc_dointvec,
3506                 },
3507                 {
3508                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3509                         .procname       =       "router_solicitation_interval",
3510                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3511                         .maxlen         =       sizeof(int),
3512                         .mode           =       0644,
3513                         .proc_handler   =       &proc_dointvec_jiffies,
3514                         .strategy       =       &sysctl_jiffies,
3515                 },
3516                 {
3517                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3518                         .procname       =       "router_solicitation_delay",
3519                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3520                         .maxlen         =       sizeof(int),
3521                         .mode           =       0644,
3522                         .proc_handler   =       &proc_dointvec_jiffies,
3523                         .strategy       =       &sysctl_jiffies,
3524                 },
3525                 {
3526                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3527                         .procname       =       "force_mld_version",
3528                         .data           =       &ipv6_devconf.force_mld_version,
3529                         .maxlen         =       sizeof(int),
3530                         .mode           =       0644,
3531                         .proc_handler   =       &proc_dointvec,
3532                 },
3533 #ifdef CONFIG_IPV6_PRIVACY
3534                 {
3535                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3536                         .procname       =       "use_tempaddr",
3537                         .data           =       &ipv6_devconf.use_tempaddr,
3538                         .maxlen         =       sizeof(int),
3539                         .mode           =       0644,
3540                         .proc_handler   =       &proc_dointvec,
3541                 },
3542                 {
3543                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3544                         .procname       =       "temp_valid_lft",
3545                         .data           =       &ipv6_devconf.temp_valid_lft,
3546                         .maxlen         =       sizeof(int),
3547                         .mode           =       0644,
3548                         .proc_handler   =       &proc_dointvec,
3549                 },
3550                 {
3551                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3552                         .procname       =       "temp_prefered_lft",
3553                         .data           =       &ipv6_devconf.temp_prefered_lft,
3554                         .maxlen         =       sizeof(int),
3555                         .mode           =       0644,
3556                         .proc_handler   =       &proc_dointvec,
3557                 },
3558                 {
3559                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3560                         .procname       =       "regen_max_retry",
3561                         .data           =       &ipv6_devconf.regen_max_retry,
3562                         .maxlen         =       sizeof(int),
3563                         .mode           =       0644,
3564                         .proc_handler   =       &proc_dointvec,
3565                 },
3566                 {
3567                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3568                         .procname       =       "max_desync_factor",
3569                         .data           =       &ipv6_devconf.max_desync_factor,
3570                         .maxlen         =       sizeof(int),
3571                         .mode           =       0644,
3572                         .proc_handler   =       &proc_dointvec,
3573                 },
3574 #endif
3575                 {
3576                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3577                         .procname       =       "max_addresses",
3578                         .data           =       &ipv6_devconf.max_addresses,
3579                         .maxlen         =       sizeof(int),
3580                         .mode           =       0644,
3581                         .proc_handler   =       &proc_dointvec,
3582                 },
3583                 {
3584                         .ctl_name       =       0,      /* sentinel */
3585                 }
3586         },
3587         .addrconf_dev = {
3588                 {
3589                         .ctl_name       =       NET_PROTO_CONF_ALL,
3590                         .procname       =       "all",
3591                         .mode           =       0555,
3592                         .child          =       addrconf_sysctl.addrconf_vars,
3593                 },
3594                 {
3595                         .ctl_name       =       0,      /* sentinel */
3596                 }
3597         },
3598         .addrconf_conf_dir = {
3599                 {
3600                         .ctl_name       =       NET_IPV6_CONF,
3601                         .procname       =       "conf",
3602                         .mode           =       0555,
3603                         .child          =       addrconf_sysctl.addrconf_dev,
3604                 },
3605                 {
3606                         .ctl_name       =       0,      /* sentinel */
3607                 }
3608         },
3609         .addrconf_proto_dir = {
3610                 {
3611                         .ctl_name       =       NET_IPV6,
3612                         .procname       =       "ipv6",
3613                         .mode           =       0555,
3614                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3615                 },
3616                 {
3617                         .ctl_name       =       0,      /* sentinel */
3618                 }
3619         },
3620         .addrconf_root_dir = {
3621                 {
3622                         .ctl_name       =       CTL_NET,
3623                         .procname       =       "net",
3624                         .mode           =       0555,
3625                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3626                 },
3627                 {
3628                         .ctl_name       =       0,      /* sentinel */
3629                 }
3630         },
3631 };
3632
3633 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3634 {
3635         int i;
3636         struct net_device *dev = idev ? idev->dev : NULL;
3637         struct addrconf_sysctl_table *t;
3638         char *dev_name = NULL;
3639
3640         t = kmalloc(sizeof(*t), GFP_KERNEL);
3641         if (t == NULL)
3642                 return;
3643         memcpy(t, &addrconf_sysctl, sizeof(*t));
3644         for (i=0; t->addrconf_vars[i].data; i++) {
3645                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3646                 t->addrconf_vars[i].de = NULL;
3647                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3648         }
3649         if (dev) {
3650                 dev_name = dev->name;
3651                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3652         } else {
3653                 dev_name = "default";
3654                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3655         }
3656
3657         /*
3658          * Make a copy of dev_name, because '.procname' is regarded as const
3659          * by sysctl and we wouldn't want anyone to change it under our feet
3660          * (see SIOCSIFNAME).
3661          */
3662         dev_name = kstrdup(dev_name, GFP_KERNEL);
3663         if (!dev_name)
3664             goto free;
3665
3666         t->addrconf_dev[0].procname = dev_name;
3667
3668         t->addrconf_dev[0].child = t->addrconf_vars;
3669         t->addrconf_dev[0].de = NULL;
3670         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3671         t->addrconf_conf_dir[0].de = NULL;
3672         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3673         t->addrconf_proto_dir[0].de = NULL;
3674         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3675         t->addrconf_root_dir[0].de = NULL;
3676
3677         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3678         if (t->sysctl_header == NULL)
3679                 goto free_procname;
3680         else
3681                 p->sysctl = t;
3682         return;
3683
3684         /* error path */
3685  free_procname:
3686         kfree(dev_name);
3687  free:
3688         kfree(t);
3689
3690         return;
3691 }
3692
3693 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3694 {
3695         if (p->sysctl) {
3696                 struct addrconf_sysctl_table *t = p->sysctl;
3697                 p->sysctl = NULL;
3698                 unregister_sysctl_table(t->sysctl_header);
3699                 kfree(t->addrconf_dev[0].procname);
3700                 kfree(t);
3701         }
3702 }
3703
3704
3705 #endif
3706
3707 /*
3708  *      Device notifier
3709  */
3710
3711 int register_inet6addr_notifier(struct notifier_block *nb)
3712 {
3713         return notifier_chain_register(&inet6addr_chain, nb);
3714 }
3715
3716 int unregister_inet6addr_notifier(struct notifier_block *nb)
3717 {
3718         return notifier_chain_unregister(&inet6addr_chain,nb);
3719 }
3720
3721 /*
3722  *      Init / cleanup code
3723  */
3724
3725 int __init addrconf_init(void)
3726 {
3727         int err = 0;
3728
3729         /* The addrconf netdev notifier requires that loopback_dev
3730          * has it's ipv6 private information allocated and setup
3731          * before it can bring up and give link-local addresses
3732          * to other devices which are up.
3733          *
3734          * Unfortunately, loopback_dev is not necessarily the first
3735          * entry in the global dev_base list of net devices.  In fact,
3736          * it is likely to be the very last entry on that list.
3737          * So this causes the notifier registry below to try and
3738          * give link-local addresses to all devices besides loopback_dev
3739          * first, then loopback_dev, which cases all the non-loopback_dev
3740          * devices to fail to get a link-local address.
3741          *
3742          * So, as a temporary fix, allocate the ipv6 structure for
3743          * loopback_dev first by hand.
3744          * Longer term, all of the dependencies ipv6 has upon the loopback
3745          * device and it being up should be removed.
3746          */
3747         rtnl_lock();
3748         if (!ipv6_add_dev(&loopback_dev))
3749                 err = -ENOMEM;
3750         rtnl_unlock();
3751         if (err)
3752                 return err;
3753
3754         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3755
3756         register_netdevice_notifier(&ipv6_dev_notf);
3757
3758 #ifdef CONFIG_IPV6_PRIVACY
3759         md5_tfm = crypto_alloc_tfm("md5", 0);
3760         if (unlikely(md5_tfm == NULL))
3761                 printk(KERN_WARNING
3762                         "failed to load transform for md5\n");
3763 #endif
3764
3765         addrconf_verify(0);
3766         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3767 #ifdef CONFIG_SYSCTL
3768         addrconf_sysctl.sysctl_header =
3769                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3770         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3771 #endif
3772
3773         return 0;
3774 }
3775
3776 void __exit addrconf_cleanup(void)
3777 {
3778         struct net_device *dev;
3779         struct inet6_dev *idev;
3780         struct inet6_ifaddr *ifa;
3781         int i;
3782
3783         unregister_netdevice_notifier(&ipv6_dev_notf);
3784
3785         rtnetlink_links[PF_INET6] = NULL;
3786 #ifdef CONFIG_SYSCTL
3787         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3788         addrconf_sysctl_unregister(&ipv6_devconf);
3789 #endif
3790
3791         rtnl_lock();
3792
3793         /*
3794          *      clean dev list.
3795          */
3796
3797         for (dev=dev_base; dev; dev=dev->next) {
3798                 if ((idev = __in6_dev_get(dev)) == NULL)
3799                         continue;
3800                 addrconf_ifdown(dev, 1);
3801         }
3802         addrconf_ifdown(&loopback_dev, 2);
3803
3804         /*
3805          *      Check hash table.
3806          */
3807
3808         write_lock_bh(&addrconf_hash_lock);
3809         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3810                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3811                         struct inet6_ifaddr *bifa;
3812
3813                         bifa = ifa;
3814                         ifa = ifa->lst_next;
3815                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3816                         /* Do not free it; something is wrong.
3817                            Now we can investigate it with debugger.
3818                          */
3819                 }
3820         }
3821         write_unlock_bh(&addrconf_hash_lock);
3822
3823         del_timer(&addr_chk_timer);
3824
3825         rtnl_unlock();
3826
3827 #ifdef CONFIG_IPV6_PRIVACY
3828         crypto_free_tfm(md5_tfm);
3829         md5_tfm = NULL;
3830 #endif
3831
3832 #ifdef CONFIG_PROC_FS
3833         proc_net_remove("if_inet6");
3834 #endif
3835 }