net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/config.h>
  44 #include <linux/errno.h>
  45 #include <linux/types.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/sched.h>
  49 #include <linux/net.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #ifdef CONFIG_SYSCTL
  59 #include <linux/sysctl.h>
  60 #endif
  61 #include <linux/capability.h>
  62 #include <linux/delay.h>
  63 #include <linux/notifier.h>
  64 #include <linux/string.h>
  65
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <linux/if_tunnel.h>
  77 #include <linux/rtnetlink.h>
  78
  79 #ifdef CONFIG_IPV6_PRIVACY
  80 #include <linux/random.h>
  81 #include <linux/crypto.h>
  82 #include <linux/scatterlist.h>
  83 #endif
  84
  85 #include <asm/uaccess.h>
  86
  87 #include <linux/proc_fs.h>
  88 #include <linux/seq_file.h>
  89
  90 /* Set to 3 to get tracing... */
  91 #define ACONF_DEBUG 2
  92
  93 #if ACONF_DEBUG >= 3
  94 #define ADBG(x) printk x
  95 #else
  96 #define ADBG(x)
  97 #endif
  98
  99 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 101
 102 #ifdef CONFIG_SYSCTL
 103 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 104 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 105 #endif
 106
 107 #ifdef CONFIG_IPV6_PRIVACY
 108 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 109 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 110 static void ipv6_regen_rndid(unsigned long data);
 111
 112 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 113 static struct crypto_tfm *md5_tfm;
 114 static DEFINE_SPINLOCK(md5_tfm_lock);
 115 #endif
 116
 117 static int ipv6_count_addresses(struct inet6_dev *idev);
 118
 119 /*
 120  *      Configured unicast address hash table
 121  */
 122 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 123 static DEFINE_RWLOCK(addrconf_hash_lock);
 124
 125 /* Protects inet6 devices */
 126 DEFINE_RWLOCK(addrconf_lock);
 127
 128 static void addrconf_verify(unsigned long);
 129
 130 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 131 static DEFINE_SPINLOCK(addrconf_verify_lock);
 132
 133 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 134 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 135
 136 static int addrconf_ifdown(struct net_device *dev, int how);
 137
 138 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 139 static void addrconf_dad_timer(unsigned long data);
 140 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 141 static void addrconf_dad_run(struct inet6_dev *idev);
 142 static void addrconf_rs_timer(unsigned long data);
 143 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 144 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 145
 146 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 147                                 struct prefix_info *pinfo);
 148 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 149
 150 static struct notifier_block *inet6addr_chain;
 151
 152 struct ipv6_devconf ipv6_devconf = {
 153         .forwarding             = 0,
 154         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 155         .mtu6                   = IPV6_MIN_MTU,
 156         .accept_ra              = 1,
 157         .accept_redirects       = 1,
 158         .autoconf               = 1,
 159         .force_mld_version      = 0,
 160         .dad_transmits          = 1,
 161         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 162         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 163         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 164 #ifdef CONFIG_IPV6_PRIVACY
 165         .use_tempaddr           = 0,
 166         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 167         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 168         .regen_max_retry        = REGEN_MAX_RETRY,
 169         .max_desync_factor      = MAX_DESYNC_FACTOR,
 170 #endif
 171         .max_addresses          = IPV6_MAX_ADDRESSES,
 172 };
 173
 174 static struct ipv6_devconf ipv6_devconf_dflt = {
 175         .forwarding             = 0,
 176         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 177         .mtu6                   = IPV6_MIN_MTU,
 178         .accept_ra              = 1,
 179         .accept_redirects       = 1,
 180         .autoconf               = 1,
 181         .dad_transmits          = 1,
 182         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 183         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 184         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 185 #ifdef CONFIG_IPV6_PRIVACY
 186         .use_tempaddr           = 0,
 187         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 188         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 189         .regen_max_retry        = REGEN_MAX_RETRY,
 190         .max_desync_factor      = MAX_DESYNC_FACTOR,
 191 #endif
 192         .max_addresses          = IPV6_MAX_ADDRESSES,
 193 };
 194
 195 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 196 #if 0
 197 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 198 #endif
 199 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 200
 201 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 202
 203 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 204 {
 205         switch(scope) {
 206         case IPV6_ADDR_SCOPE_NODELOCAL:
 207                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 208                         IPV6_ADDR_LOOPBACK);
 209         case IPV6_ADDR_SCOPE_LINKLOCAL:
 210                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 211                         IPV6_ADDR_LINKLOCAL);
 212         case IPV6_ADDR_SCOPE_SITELOCAL:
 213                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 214                         IPV6_ADDR_SITELOCAL);
 215         }
 216         return IPV6_ADDR_SCOPE_TYPE(scope);
 217 }
 218
 219 int __ipv6_addr_type(const struct in6_addr *addr)
 220 {
 221         u32 st;
 222
 223         st = addr->s6_addr32[0];
 224
 225         /* Consider all addresses with the first three bits different of
 226            000 and 111 as unicasts.
 227          */
 228         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 229             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 230                 return (IPV6_ADDR_UNICAST |
 231                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 232
 233         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 234                 /* multicast */
 235                 /* addr-select 3.1 */
 236                 return (IPV6_ADDR_MULTICAST |
 237                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 238         }
 239
 240         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 241                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 242                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 243         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 244                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 245                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 246
 247         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 248                 if (addr->s6_addr32[2] == 0) {
 249                         if (addr->s6_addr32[3] == 0)
 250                                 return IPV6_ADDR_ANY;
 251
 252                         if (addr->s6_addr32[3] == htonl(0x00000001))
 253                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 254                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 255
 256                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 257                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 258                 }
 259
 260                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 261                         return (IPV6_ADDR_MAPPED |
 262                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 263         }
 264
 265         return (IPV6_ADDR_RESERVED |
 266                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 267 }
 268
 269 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 270 {
 271         if (del_timer(&ifp->timer))
 272                 __in6_ifa_put(ifp);
 273 }
 274
 275 enum addrconf_timer_t
 276 {
 277         AC_NONE,
 278         AC_DAD,
 279         AC_RS,
 280 };
 281
 282 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 283                                enum addrconf_timer_t what,
 284                                unsigned long when)
 285 {
 286         if (!del_timer(&ifp->timer))
 287                 in6_ifa_hold(ifp);
 288
 289         switch (what) {
 290         case AC_DAD:
 291                 ifp->timer.function = addrconf_dad_timer;
 292                 break;
 293         case AC_RS:
 294                 ifp->timer.function = addrconf_rs_timer;
 295                 break;
 296         default:;
 297         }
 298         ifp->timer.expires = jiffies + when;
 299         add_timer(&ifp->timer);
 300 }
 301
 302 /* Nobody refers to this device, we may destroy it. */
 303
 304 void in6_dev_finish_destroy(struct inet6_dev *idev)
 305 {
 306         struct net_device *dev = idev->dev;
 307         BUG_TRAP(idev->addr_list==NULL);
 308         BUG_TRAP(idev->mc_list==NULL);
 309 #ifdef NET_REFCNT_DEBUG
 310         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 311 #endif
 312         dev_put(dev);
 313         if (!idev->dead) {
 314                 printk("Freeing alive inet6 device %p\n", idev);
 315                 return;
 316         }
 317         snmp6_free_dev(idev);
 318         kfree(idev);
 319 }
 320
 321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 322 {
 323         struct inet6_dev *ndev;
 324
 325         ASSERT_RTNL();
 326
 327         if (dev->mtu < IPV6_MIN_MTU)
 328                 return NULL;
 329
 330         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 331
 332         if (ndev) {
 333                 memset(ndev, 0, sizeof(struct inet6_dev));
 334
 335                 rwlock_init(&ndev->lock);
 336                 ndev->dev = dev;
 337                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 338                 ndev->cnf.mtu6 = dev->mtu;
 339                 ndev->cnf.sysctl = NULL;
 340                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 341                 if (ndev->nd_parms == NULL) {
 342                         kfree(ndev);
 343                         return NULL;
 344                 }
 345                 /* We refer to the device */
 346                 dev_hold(dev);
 347
 348                 if (snmp6_alloc_dev(ndev) < 0) {
 349                         ADBG((KERN_WARNING
 350                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
 351                                 __FUNCTION__, dev->name));
 352                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 353                         ndev->dead = 1;
 354                         in6_dev_finish_destroy(ndev);
 355                         return NULL;
 356                 }
 357
 358                 if (snmp6_register_dev(ndev) < 0) {
 359                         ADBG((KERN_WARNING
 360                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 361                                 __FUNCTION__, dev->name));
 362                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 363                         ndev->dead = 1;
 364                         in6_dev_finish_destroy(ndev);
 365                         return NULL;
 366                 }
 367
 368                 /* One reference from device.  We must do this before
 369                  * we invoke __ipv6_regen_rndid().
 370                  */
 371                 in6_dev_hold(ndev);
 372
 373 #ifdef CONFIG_IPV6_PRIVACY
 374                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
 375                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
 376                 init_timer(&ndev->regen_timer);
 377                 ndev->regen_timer.function = ipv6_regen_rndid;
 378                 ndev->regen_timer.data = (unsigned long) ndev;
 379                 if ((dev->flags&IFF_LOOPBACK) ||
 380                     dev->type == ARPHRD_TUNNEL ||
 381                     dev->type == ARPHRD_NONE ||
 382                     dev->type == ARPHRD_SIT) {
 383                         printk(KERN_INFO
 384                                "%s: Disabled Privacy Extensions\n",
 385                                dev->name);
 386                         ndev->cnf.use_tempaddr = -1;
 387                 } else {
 388                         in6_dev_hold(ndev);
 389                         ipv6_regen_rndid((unsigned long) ndev);
 390                 }
 391 #endif
 392
 393                 if (netif_carrier_ok(dev))
 394                         ndev->if_flags |= IF_READY;
 395
 396                 write_lock_bh(&addrconf_lock);
 397                 dev->ip6_ptr = ndev;
 398                 write_unlock_bh(&addrconf_lock);
 399
 400                 ipv6_mc_init_dev(ndev);
 401                 ndev->tstamp = jiffies;
 402 #ifdef CONFIG_SYSCTL
 403                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 404                                       NET_IPV6_NEIGH, "ipv6",
 405                                       &ndisc_ifinfo_sysctl_change,
 406                                       NULL);
 407                 addrconf_sysctl_register(ndev, &ndev->cnf);
 408 #endif
 409         }
 410         return ndev;
 411 }
 412
 413 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 414 {
 415         struct inet6_dev *idev;
 416
 417         ASSERT_RTNL();
 418
 419         if ((idev = __in6_dev_get(dev)) == NULL) {
 420                 if ((idev = ipv6_add_dev(dev)) == NULL)
 421                         return NULL;
 422         }
 423
 424         if (dev->flags&IFF_UP)
 425                 ipv6_mc_up(idev);
 426         return idev;
 427 }
 428
 429 #ifdef CONFIG_SYSCTL
 430 static void dev_forward_change(struct inet6_dev *idev)
 431 {
 432         struct net_device *dev;
 433         struct inet6_ifaddr *ifa;
 434         struct in6_addr addr;
 435
 436         if (!idev)
 437                 return;
 438         dev = idev->dev;
 439         if (dev && (dev->flags & IFF_MULTICAST)) {
 440                 ipv6_addr_all_routers(&addr);
 441
 442                 if (idev->cnf.forwarding)
 443                         ipv6_dev_mc_inc(dev, &addr);
 444                 else
 445                         ipv6_dev_mc_dec(dev, &addr);
 446         }
 447         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 448                 if (idev->cnf.forwarding)
 449                         addrconf_join_anycast(ifa);
 450                 else
 451                         addrconf_leave_anycast(ifa);
 452         }
 453 }
 454
 455
 456 static void addrconf_forward_change(void)
 457 {
 458         struct net_device *dev;
 459         struct inet6_dev *idev;
 460
 461         read_lock(&dev_base_lock);
 462         for (dev=dev_base; dev; dev=dev->next) {
 463                 read_lock(&addrconf_lock);
 464                 idev = __in6_dev_get(dev);
 465                 if (idev) {
 466                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 467                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 468                         if (changed)
 469                                 dev_forward_change(idev);
 470                 }
 471                 read_unlock(&addrconf_lock);
 472         }
 473         read_unlock(&dev_base_lock);
 474 }
 475 #endif
 476
 477 /* Nobody refers to this ifaddr, destroy it */
 478
 479 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 480 {
 481         BUG_TRAP(ifp->if_next==NULL);
 482         BUG_TRAP(ifp->lst_next==NULL);
 483 #ifdef NET_REFCNT_DEBUG
 484         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 485 #endif
 486
 487         in6_dev_put(ifp->idev);
 488
 489         if (del_timer(&ifp->timer))
 490                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 491
 492         if (!ifp->dead) {
 493                 printk("Freeing alive inet6 address %p\n", ifp);
 494                 return;
 495         }
 496         dst_release(&ifp->rt->u.dst);
 497
 498         kfree(ifp);
 499 }
 500
 501 /* On success it returns ifp with increased reference count */
 502
 503 static struct inet6_ifaddr *
 504 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 505               int scope, u32 flags)
 506 {
 507         struct inet6_ifaddr *ifa = NULL;
 508         struct rt6_info *rt;
 509         int hash;
 510         int err = 0;
 511
 512         read_lock_bh(&addrconf_lock);
 513         if (idev->dead) {
 514                 err = -ENODEV;                  /*XXX*/
 515                 goto out2;
 516         }
 517
 518         write_lock(&addrconf_hash_lock);
 519
 520         /* Ignore adding duplicate addresses on an interface */
 521         if (ipv6_chk_same_addr(addr, idev->dev)) {
 522                 ADBG(("ipv6_add_addr: already assigned\n"));
 523                 err = -EEXIST;
 524                 goto out;
 525         }
 526
 527         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 528
 529         if (ifa == NULL) {
 530                 ADBG(("ipv6_add_addr: malloc failed\n"));
 531                 err = -ENOBUFS;
 532                 goto out;
 533         }
 534
 535         rt = addrconf_dst_alloc(idev, addr, 0);
 536         if (IS_ERR(rt)) {
 537                 err = PTR_ERR(rt);
 538                 goto out;
 539         }
 540
 541         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 542         ipv6_addr_copy(&ifa->addr, addr);
 543
 544         spin_lock_init(&ifa->lock);
 545         init_timer(&ifa->timer);
 546         ifa->timer.data = (unsigned long) ifa;
 547         ifa->scope = scope;
 548         ifa->prefix_len = pfxlen;
 549         ifa->flags = flags | IFA_F_TENTATIVE;
 550         ifa->cstamp = ifa->tstamp = jiffies;
 551
 552         ifa->idev = idev;
 553         in6_dev_hold(idev);
 554         /* For caller */
 555         in6_ifa_hold(ifa);
 556
 557         /* Add to big hash table */
 558         hash = ipv6_addr_hash(addr);
 559
 560         ifa->lst_next = inet6_addr_lst[hash];
 561         inet6_addr_lst[hash] = ifa;
 562         in6_ifa_hold(ifa);
 563         write_unlock(&addrconf_hash_lock);
 564
 565         write_lock(&idev->lock);
 566         /* Add to inet6_dev unicast addr list. */
 567         ifa->if_next = idev->addr_list;
 568         idev->addr_list = ifa;
 569
 570 #ifdef CONFIG_IPV6_PRIVACY
 571         if (ifa->flags&IFA_F_TEMPORARY) {
 572                 ifa->tmp_next = idev->tempaddr_list;
 573                 idev->tempaddr_list = ifa;
 574                 in6_ifa_hold(ifa);
 575         }
 576 #endif
 577
 578         ifa->rt = rt;
 579
 580         in6_ifa_hold(ifa);
 581         write_unlock(&idev->lock);
 582 out2:
 583         read_unlock_bh(&addrconf_lock);
 584
 585         if (likely(err == 0))
 586                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 587         else {
 588                 kfree(ifa);
 589                 ifa = ERR_PTR(err);
 590         }
 591
 592         return ifa;
 593 out:
 594         write_unlock(&addrconf_hash_lock);
 595         goto out2;
 596 }
 597
 598 /* This function wants to get referenced ifp and releases it before return */
 599
 600 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 601 {
 602         struct inet6_ifaddr *ifa, **ifap;
 603         struct inet6_dev *idev = ifp->idev;
 604         int hash;
 605         int deleted = 0, onlink = 0;
 606         unsigned long expires = jiffies;
 607
 608         hash = ipv6_addr_hash(&ifp->addr);
 609
 610         ifp->dead = 1;
 611
 612         write_lock_bh(&addrconf_hash_lock);
 613         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 614              ifap = &ifa->lst_next) {
 615                 if (ifa == ifp) {
 616                         *ifap = ifa->lst_next;
 617                         __in6_ifa_put(ifp);
 618                         ifa->lst_next = NULL;
 619                         break;
 620                 }
 621         }
 622         write_unlock_bh(&addrconf_hash_lock);
 623
 624         write_lock_bh(&idev->lock);
 625 #ifdef CONFIG_IPV6_PRIVACY
 626         if (ifp->flags&IFA_F_TEMPORARY) {
 627                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 628                      ifap = &ifa->tmp_next) {
 629                         if (ifa == ifp) {
 630                                 *ifap = ifa->tmp_next;
 631                                 if (ifp->ifpub) {
 632                                         in6_ifa_put(ifp->ifpub);
 633                                         ifp->ifpub = NULL;
 634                                 }
 635                                 __in6_ifa_put(ifp);
 636                                 ifa->tmp_next = NULL;
 637                                 break;
 638                         }
 639                 }
 640         }
 641 #endif
 642
 643         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 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                         continue;
 652                 } else if (ifp->flags & IFA_F_PERMANENT) {
 653                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 654                                               ifp->prefix_len)) {
 655                                 if (ifa->flags & IFA_F_PERMANENT) {
 656                                         onlink = 1;
 657                                         if (deleted)
 658                                                 break;
 659                                 } else {
 660                                         unsigned long lifetime;
 661
 662                                         if (!onlink)
 663                                                 onlink = -1;
 664
 665                                         spin_lock(&ifa->lock);
 666                                         lifetime = min_t(unsigned long,
 667                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 668                                         if (time_before(expires,
 669                                                         ifa->tstamp + lifetime * HZ))
 670                                                 expires = ifa->tstamp + lifetime * HZ;
 671                                         spin_unlock(&ifa->lock);
 672                                 }
 673                         }
 674                 }
 675                 ifap = &ifa->if_next;
 676         }
 677         write_unlock_bh(&idev->lock);
 678
 679         ipv6_ifa_notify(RTM_DELADDR, ifp);
 680
 681         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 682
 683         addrconf_del_timer(ifp);
 684
 685         /*
 686          * Purge or update corresponding prefix
 687          *
 688          * 1) we don't purge prefix here if address was not permanent.
 689          *    prefix is managed by its own lifetime.
 690          * 2) if there're no addresses, delete prefix.
 691          * 3) if there're still other permanent address(es),
 692          *    corresponding prefix is still permanent.
 693          * 4) otherwise, update prefix lifetime to the
 694          *    longest valid lifetime among the corresponding
 695          *    addresses on the device.
 696          *    Note: subsequent RA will update lifetime.
 697          *
 698          * --yoshfuji
 699          */
 700         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 701                 struct in6_addr prefix;
 702                 struct rt6_info *rt;
 703
 704                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 705                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 706
 707                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 708                         if (onlink == 0) {
 709                                 ip6_del_rt(rt, NULL, NULL, NULL);
 710                                 rt = NULL;
 711                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 712                                 rt->rt6i_expires = expires;
 713                                 rt->rt6i_flags |= RTF_EXPIRES;
 714                         }
 715                 }
 716                 dst_release(&rt->u.dst);
 717         }
 718
 719         in6_ifa_put(ifp);
 720 }
 721
 722 #ifdef CONFIG_IPV6_PRIVACY
 723 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 724 {
 725         struct inet6_dev *idev = ifp->idev;
 726         struct in6_addr addr, *tmpaddr;
 727         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 728         int tmp_plen;
 729         int ret = 0;
 730         int max_addresses;
 731
 732         write_lock(&idev->lock);
 733         if (ift) {
 734                 spin_lock_bh(&ift->lock);
 735                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 736                 spin_unlock_bh(&ift->lock);
 737                 tmpaddr = &addr;
 738         } else {
 739                 tmpaddr = NULL;
 740         }
 741 retry:
 742         in6_dev_hold(idev);
 743         if (idev->cnf.use_tempaddr <= 0) {
 744                 write_unlock(&idev->lock);
 745                 printk(KERN_INFO
 746                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 747                 in6_dev_put(idev);
 748                 ret = -1;
 749                 goto out;
 750         }
 751         spin_lock_bh(&ifp->lock);
 752         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 753                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 754                 spin_unlock_bh(&ifp->lock);
 755                 write_unlock(&idev->lock);
 756                 printk(KERN_WARNING
 757                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 758                 in6_dev_put(idev);
 759                 ret = -1;
 760                 goto out;
 761         }
 762         in6_ifa_hold(ifp);
 763         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 764         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 765                 spin_unlock_bh(&ifp->lock);
 766                 write_unlock(&idev->lock);
 767                 printk(KERN_WARNING
 768                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 769                 in6_ifa_put(ifp);
 770                 in6_dev_put(idev);
 771                 ret = -1;
 772                 goto out;
 773         }
 774         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 775         tmp_valid_lft = min_t(__u32,
 776                               ifp->valid_lft,
 777                               idev->cnf.temp_valid_lft);
 778         tmp_prefered_lft = min_t(__u32,
 779                                  ifp->prefered_lft,
 780                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 781         tmp_plen = ifp->prefix_len;
 782         max_addresses = idev->cnf.max_addresses;
 783         tmp_cstamp = ifp->cstamp;
 784         tmp_tstamp = ifp->tstamp;
 785         spin_unlock_bh(&ifp->lock);
 786
 787         write_unlock(&idev->lock);
 788         ift = !max_addresses ||
 789               ipv6_count_addresses(idev) < max_addresses ?
 790                 ipv6_add_addr(idev, &addr, tmp_plen,
 791                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 792         if (!ift || IS_ERR(ift)) {
 793                 in6_ifa_put(ifp);
 794                 in6_dev_put(idev);
 795                 printk(KERN_INFO
 796                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 797                 tmpaddr = &addr;
 798                 write_lock(&idev->lock);
 799                 goto retry;
 800         }
 801
 802         spin_lock_bh(&ift->lock);
 803         ift->ifpub = ifp;
 804         ift->valid_lft = tmp_valid_lft;
 805         ift->prefered_lft = tmp_prefered_lft;
 806         ift->cstamp = tmp_cstamp;
 807         ift->tstamp = tmp_tstamp;
 808         spin_unlock_bh(&ift->lock);
 809
 810         addrconf_dad_start(ift, 0);
 811         in6_ifa_put(ift);
 812         in6_dev_put(idev);
 813 out:
 814         return ret;
 815 }
 816 #endif
 817
 818 /*
 819  *      Choose an appropriate source address (RFC3484)
 820  */
 821 struct ipv6_saddr_score {
 822         int             addr_type;
 823         unsigned int    attrs;
 824         int             matchlen;
 825         unsigned int    scope;
 826         unsigned int    rule;
 827 };
 828
 829 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 830 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 831 #define IPV6_SADDR_SCORE_HOA            0x0008
 832 #define IPV6_SADDR_SCORE_OIF            0x0010
 833 #define IPV6_SADDR_SCORE_LABEL          0x0020
 834 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 835
 836 static int inline ipv6_saddr_preferred(int type)
 837 {
 838         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 839                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 840                 return 1;
 841         return 0;
 842 }
 843
 844 /* static matching label */
 845 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 846 {
 847  /*
 848   *     prefix (longest match)  label
 849   *     -----------------------------
 850   *     ::1/128                 0
 851   *     ::/0                    1
 852   *     2002::/16               2
 853   *     ::/96                   3
 854   *     ::ffff:0:0/96           4
 855   */
 856         if (type & IPV6_ADDR_LOOPBACK)
 857                 return 0;
 858         else if (type & IPV6_ADDR_COMPATv4)
 859                 return 3;
 860         else if (type & IPV6_ADDR_MAPPED)
 861                 return 4;
 862         else if (addr->s6_addr16[0] == htons(0x2002))
 863                 return 2;
 864         return 1;
 865 }
 866
 867 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 868                        struct in6_addr *daddr, struct in6_addr *saddr)
 869 {
 870         struct ipv6_saddr_score hiscore;
 871         struct inet6_ifaddr *ifa_result = NULL;
 872         int daddr_type = __ipv6_addr_type(daddr);
 873         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 874         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 875         struct net_device *dev;
 876
 877         memset(&hiscore, 0, sizeof(hiscore));
 878
 879         read_lock(&dev_base_lock);
 880         read_lock(&addrconf_lock);
 881
 882         for (dev = dev_base; dev; dev=dev->next) {
 883                 struct inet6_dev *idev;
 884                 struct inet6_ifaddr *ifa;
 885
 886                 /* Rule 0: Candidate Source Address (section 4)
 887                  *  - multicast and link-local destination address,
 888                  *    the set of candidate source address MUST only
 889                  *    include addresses assigned to interfaces
 890                  *    belonging to the same link as the outgoing
 891                  *    interface.
 892                  * (- For site-local destination addresses, the
 893                  *    set of candidate source addresses MUST only
 894                  *    include addresses assigned to interfaces
 895                  *    belonging to the same site as the outgoing
 896                  *    interface.)
 897                  */
 898                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 899                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 900                     daddr_dev && dev != daddr_dev)
 901                         continue;
 902
 903                 idev = __in6_dev_get(dev);
 904                 if (!idev)
 905                         continue;
 906
 907                 read_lock_bh(&idev->lock);
 908                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 909                         struct ipv6_saddr_score score;
 910
 911                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 912
 913                         /* Rule 0:
 914                          * - Tentative Address (RFC2462 section 5.4)
 915                          *  - A tentative address is not considered
 916                          *    "assigned to an interface" in the traditional
 917                          *    sense.
 918                          * - Candidate Source Address (section 4)
 919                          *  - In any case, anycast addresses, multicast
 920                          *    addresses, and the unspecified address MUST
 921                          *    NOT be included in a candidate set.
 922                          */
 923                         if (ifa->flags & IFA_F_TENTATIVE)
 924                                 continue;
 925                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 926                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 927                                 LIMIT_NETDEBUG(KERN_DEBUG
 928                                                "ADDRCONF: unspecified / multicast address"
 929                                                "assigned as unicast address on %s",
 930                                                dev->name);
 931                                 continue;
 932                         }
 933
 934                         score.attrs = 0;
 935                         score.matchlen = 0;
 936                         score.scope = 0;
 937                         score.rule = 0;
 938
 939                         if (ifa_result == NULL) {
 940                                 /* record it if the first available entry */
 941                                 goto record_it;
 942                         }
 943
 944                         /* Rule 1: Prefer same address */
 945                         if (hiscore.rule < 1) {
 946                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 947                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 948                                 hiscore.rule++;
 949                         }
 950                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 951                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 952                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 953                                         score.rule = 1;
 954                                         goto record_it;
 955                                 }
 956                         } else {
 957                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 958                                         continue;
 959                         }
 960
 961                         /* Rule 2: Prefer appropriate scope */
 962                         if (hiscore.rule < 2) {
 963                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 964                                 hiscore.rule++;
 965                         }
 966                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 967                         if (hiscore.scope < score.scope) {
 968                                 if (hiscore.scope < daddr_scope) {
 969                                         score.rule = 2;
 970                                         goto record_it;
 971                                 } else
 972                                         continue;
 973                         } else if (score.scope < hiscore.scope) {
 974                                 if (score.scope < daddr_scope)
 975                                         continue;
 976                                 else {
 977                                         score.rule = 2;
 978                                         goto record_it;
 979                                 }
 980                         }
 981
 982                         /* Rule 3: Avoid deprecated address */
 983                         if (hiscore.rule < 3) {
 984                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 985                                     !(ifa_result->flags & IFA_F_DEPRECATED))
 986                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 987                                 hiscore.rule++;
 988                         }
 989                         if (ipv6_saddr_preferred(score.addr_type) ||
 990                             !(ifa->flags & IFA_F_DEPRECATED)) {
 991                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 992                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
 993                                         score.rule = 3;
 994                                         goto record_it;
 995                                 }
 996                         } else {
 997                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
 998                                         continue;
 999                         }
1000
1001                         /* Rule 4: Prefer home address -- not implemented yet */
1002                         if (hiscore.rule < 4)
1003                                 hiscore.rule++;
1004
1005                         /* Rule 5: Prefer outgoing interface */
1006                         if (hiscore.rule < 5) {
1007                                 if (daddr_dev == NULL ||
1008                                     daddr_dev == ifa_result->idev->dev)
1009                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1010                                 hiscore.rule++;
1011                         }
1012                         if (daddr_dev == NULL ||
1013                             daddr_dev == ifa->idev->dev) {
1014                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1015                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1016                                         score.rule = 5;
1017                                         goto record_it;
1018                                 }
1019                         } else {
1020                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1021                                         continue;
1022                         }
1023
1024                         /* Rule 6: Prefer matching label */
1025                         if (hiscore.rule < 6) {
1026                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1027                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1028                                 hiscore.rule++;
1029                         }
1030                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1031                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1032                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1033                                         score.rule = 6;
1034                                         goto record_it;
1035                                 }
1036                         } else {
1037                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1038                                         continue;
1039                         }
1040
1041 #ifdef CONFIG_IPV6_PRIVACY
1042                         /* Rule 7: Prefer public address
1043                          * Note: prefer temprary address if use_tempaddr >= 2
1044                          */
1045                         if (hiscore.rule < 7) {
1046                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1047                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1048                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1049                                 hiscore.rule++;
1050                         }
1051                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1052                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1053                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1054                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1055                                         score.rule = 7;
1056                                         goto record_it;
1057                                 }
1058                         } else {
1059                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1060                                         continue;
1061                         }
1062 #endif
1063                         /* Rule 8: Use longest matching prefix */
1064                         if (hiscore.rule < 8) {
1065                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1066                                 hiscore.rule++;
1067                         }
1068                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1069                         if (score.matchlen > hiscore.matchlen) {
1070                                 score.rule = 8;
1071                                 goto record_it;
1072                         }
1073 #if 0
1074                         else if (score.matchlen < hiscore.matchlen)
1075                                 continue;
1076 #endif
1077
1078                         /* Final Rule: choose first available one */
1079                         continue;
1080 record_it:
1081                         if (ifa_result)
1082                                 in6_ifa_put(ifa_result);
1083                         in6_ifa_hold(ifa);
1084                         ifa_result = ifa;
1085                         hiscore = score;
1086                 }
1087                 read_unlock_bh(&idev->lock);
1088         }
1089         read_unlock(&addrconf_lock);
1090         read_unlock(&dev_base_lock);
1091
1092         if (!ifa_result)
1093                 return -EADDRNOTAVAIL;
1094
1095         ipv6_addr_copy(saddr, &ifa_result->addr);
1096         in6_ifa_put(ifa_result);
1097         return 0;
1098 }
1099
1100
1101 int ipv6_get_saddr(struct dst_entry *dst,
1102                    struct in6_addr *daddr, struct in6_addr *saddr)
1103 {
1104         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1105 }
1106
1107
1108 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1109 {
1110         struct inet6_dev *idev;
1111         int err = -EADDRNOTAVAIL;
1112
1113         read_lock(&addrconf_lock);
1114         if ((idev = __in6_dev_get(dev)) != NULL) {
1115                 struct inet6_ifaddr *ifp;
1116
1117                 read_lock_bh(&idev->lock);
1118                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1119                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1120                                 ipv6_addr_copy(addr, &ifp->addr);
1121                                 err = 0;
1122                                 break;
1123                         }
1124                 }
1125                 read_unlock_bh(&idev->lock);
1126         }
1127         read_unlock(&addrconf_lock);
1128         return err;
1129 }
1130
1131 static int ipv6_count_addresses(struct inet6_dev *idev)
1132 {
1133         int cnt = 0;
1134         struct inet6_ifaddr *ifp;
1135
1136         read_lock_bh(&idev->lock);
1137         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1138                 cnt++;
1139         read_unlock_bh(&idev->lock);
1140         return cnt;
1141 }
1142
1143 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1144 {
1145         struct inet6_ifaddr * ifp;
1146         u8 hash = ipv6_addr_hash(addr);
1147
1148         read_lock_bh(&addrconf_hash_lock);
1149         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1150                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1151                     !(ifp->flags&IFA_F_TENTATIVE)) {
1152                         if (dev == NULL || ifp->idev->dev == dev ||
1153                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1154                                 break;
1155                 }
1156         }
1157         read_unlock_bh(&addrconf_hash_lock);
1158         return ifp != NULL;
1159 }
1160
1161 static
1162 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1163 {
1164         struct inet6_ifaddr * ifp;
1165         u8 hash = ipv6_addr_hash(addr);
1166
1167         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1168                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1169                         if (dev == NULL || ifp->idev->dev == dev)
1170                                 break;
1171                 }
1172         }
1173         return ifp != NULL;
1174 }
1175
1176 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1177 {
1178         struct inet6_ifaddr * ifp;
1179         u8 hash = ipv6_addr_hash(addr);
1180
1181         read_lock_bh(&addrconf_hash_lock);
1182         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1183                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1184                         if (dev == NULL || ifp->idev->dev == dev ||
1185                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1186                                 in6_ifa_hold(ifp);
1187                                 break;
1188                         }
1189                 }
1190         }
1191         read_unlock_bh(&addrconf_hash_lock);
1192
1193         return ifp;
1194 }
1195
1196 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1197 {
1198         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1199         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1200         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1201         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1202         int sk_ipv6only = ipv6_only_sock(sk);
1203         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1204         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1205         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1206
1207         if (!sk2_rcv_saddr && !sk_ipv6only)
1208                 return 1;
1209
1210         if (addr_type2 == IPV6_ADDR_ANY &&
1211             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1212                 return 1;
1213
1214         if (addr_type == IPV6_ADDR_ANY &&
1215             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1216                 return 1;
1217
1218         if (sk2_rcv_saddr6 &&
1219             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1220                 return 1;
1221
1222         if (addr_type == IPV6_ADDR_MAPPED &&
1223             !sk2_ipv6only &&
1224             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1225                 return 1;
1226
1227         return 0;
1228 }
1229
1230 /* Gets referenced address, destroys ifaddr */
1231
1232 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1233 {
1234         if (ifp->flags&IFA_F_PERMANENT) {
1235                 spin_lock_bh(&ifp->lock);
1236                 addrconf_del_timer(ifp);
1237                 ifp->flags |= IFA_F_TENTATIVE;
1238                 spin_unlock_bh(&ifp->lock);
1239                 in6_ifa_put(ifp);
1240 #ifdef CONFIG_IPV6_PRIVACY
1241         } else if (ifp->flags&IFA_F_TEMPORARY) {
1242                 struct inet6_ifaddr *ifpub;
1243                 spin_lock_bh(&ifp->lock);
1244                 ifpub = ifp->ifpub;
1245                 if (ifpub) {
1246                         in6_ifa_hold(ifpub);
1247                         spin_unlock_bh(&ifp->lock);
1248                         ipv6_create_tempaddr(ifpub, ifp);
1249                         in6_ifa_put(ifpub);
1250                 } else {
1251                         spin_unlock_bh(&ifp->lock);
1252                 }
1253                 ipv6_del_addr(ifp);
1254 #endif
1255         } else
1256                 ipv6_del_addr(ifp);
1257 }
1258
1259 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1260 {
1261         if (net_ratelimit())
1262                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1263         addrconf_dad_stop(ifp);
1264 }
1265
1266 /* Join to solicited addr multicast group. */
1267
1268 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1269 {
1270         struct in6_addr maddr;
1271
1272         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1273                 return;
1274
1275         addrconf_addr_solict_mult(addr, &maddr);
1276         ipv6_dev_mc_inc(dev, &maddr);
1277 }
1278
1279 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1280 {
1281         struct in6_addr maddr;
1282
1283         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1284                 return;
1285
1286         addrconf_addr_solict_mult(addr, &maddr);
1287         __ipv6_dev_mc_dec(idev, &maddr);
1288 }
1289
1290 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1291 {
1292         struct in6_addr addr;
1293         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1294         if (ipv6_addr_any(&addr))
1295                 return;
1296         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1297 }
1298
1299 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1300 {
1301         struct in6_addr addr;
1302         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1303         if (ipv6_addr_any(&addr))
1304                 return;
1305         __ipv6_dev_ac_dec(ifp->idev, &addr);
1306 }
1307
1308 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1309 {
1310         switch (dev->type) {
1311         case ARPHRD_ETHER:
1312         case ARPHRD_FDDI:
1313         case ARPHRD_IEEE802_TR:
1314                 if (dev->addr_len != ETH_ALEN)
1315                         return -1;
1316                 memcpy(eui, dev->dev_addr, 3);
1317                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1318
1319                 /*
1320                  * The zSeries OSA network cards can be shared among various
1321                  * OS instances, but the OSA cards have only one MAC address.
1322                  * This leads to duplicate address conflicts in conjunction
1323                  * with IPv6 if more than one instance uses the same card.
1324                  *
1325                  * The driver for these cards can deliver a unique 16-bit
1326                  * identifier for each instance sharing the same card.  It is
1327                  * placed instead of 0xFFFE in the interface identifier.  The
1328                  * "u" bit of the interface identifier is not inverted in this
1329                  * case.  Hence the resulting interface identifier has local
1330                  * scope according to RFC2373.
1331                  */
1332                 if (dev->dev_id) {
1333                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1334                         eui[4] = dev->dev_id & 0xFF;
1335                 } else {
1336                         eui[3] = 0xFF;
1337                         eui[4] = 0xFE;
1338                         eui[0] ^= 2;
1339                 }
1340                 return 0;
1341         case ARPHRD_ARCNET:
1342                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1343                 if (dev->addr_len != ARCNET_ALEN)
1344                         return -1;
1345                 memset(eui, 0, 7);
1346                 eui[7] = *(u8*)dev->dev_addr;
1347                 return 0;
1348         case ARPHRD_INFINIBAND:
1349                 if (dev->addr_len != INFINIBAND_ALEN)
1350                         return -1;
1351                 memcpy(eui, dev->dev_addr + 12, 8);
1352                 eui[0] |= 2;
1353                 return 0;
1354         }
1355         return -1;
1356 }
1357
1358 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1359 {
1360         int err = -1;
1361         struct inet6_ifaddr *ifp;
1362
1363         read_lock_bh(&idev->lock);
1364         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1365                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1366                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1367                         err = 0;
1368                         break;
1369                 }
1370         }
1371         read_unlock_bh(&idev->lock);
1372         return err;
1373 }
1374
1375 #ifdef CONFIG_IPV6_PRIVACY
1376 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1377 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1378 {
1379         struct net_device *dev;
1380         struct scatterlist sg[2];
1381
1382         sg_set_buf(&sg[0], idev->entropy, 8);
1383         sg_set_buf(&sg[1], idev->work_eui64, 8);
1384
1385         dev = idev->dev;
1386
1387         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1388                 printk(KERN_INFO
1389                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1390                         idev);
1391                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1392         }
1393 regen:
1394         spin_lock(&md5_tfm_lock);
1395         if (unlikely(md5_tfm == NULL)) {
1396                 spin_unlock(&md5_tfm_lock);
1397                 return -1;
1398         }
1399         crypto_digest_init(md5_tfm);
1400         crypto_digest_update(md5_tfm, sg, 2);
1401         crypto_digest_final(md5_tfm, idev->work_digest);
1402         spin_unlock(&md5_tfm_lock);
1403
1404         memcpy(idev->rndid, &idev->work_digest[0], 8);
1405         idev->rndid[0] &= ~0x02;
1406         memcpy(idev->entropy, &idev->work_digest[8], 8);
1407
1408         /*
1409          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1410          * check if generated address is not inappropriate
1411          *
1412          *  - Reserved subnet anycast (RFC 2526)
1413          *      11111101 11....11 1xxxxxxx
1414          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1415          *      00-00-5E-FE-xx-xx-xx-xx
1416          *  - value 0
1417          *  - XXX: already assigned to an address on the device
1418          */
1419         if (idev->rndid[0] == 0xfd &&
1420             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1421             (idev->rndid[7]&0x80))
1422                 goto regen;
1423         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1424                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1425                         goto regen;
1426                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1427                         goto regen;
1428         }
1429
1430         return 0;
1431 }
1432
1433 static void ipv6_regen_rndid(unsigned long data)
1434 {
1435         struct inet6_dev *idev = (struct inet6_dev *) data;
1436         unsigned long expires;
1437
1438         read_lock_bh(&addrconf_lock);
1439         write_lock_bh(&idev->lock);
1440
1441         if (idev->dead)
1442                 goto out;
1443
1444         if (__ipv6_regen_rndid(idev) < 0)
1445                 goto out;
1446
1447         expires = jiffies +
1448                 idev->cnf.temp_prefered_lft * HZ -
1449                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1450         if (time_before(expires, jiffies)) {
1451                 printk(KERN_WARNING
1452                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1453                         idev->dev->name);
1454                 goto out;
1455         }
1456
1457         if (!mod_timer(&idev->regen_timer, expires))
1458                 in6_dev_hold(idev);
1459
1460 out:
1461         write_unlock_bh(&idev->lock);
1462         read_unlock_bh(&addrconf_lock);
1463         in6_dev_put(idev);
1464 }
1465
1466 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1467         int ret = 0;
1468
1469         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1470                 ret = __ipv6_regen_rndid(idev);
1471         return ret;
1472 }
1473 #endif
1474
1475 /*
1476  *      Add prefix route.
1477  */
1478
1479 static void
1480 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1481                       unsigned long expires, u32 flags)
1482 {
1483         struct in6_rtmsg rtmsg;
1484
1485         memset(&rtmsg, 0, sizeof(rtmsg));
1486         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1487         rtmsg.rtmsg_dst_len = plen;
1488         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1489         rtmsg.rtmsg_ifindex = dev->ifindex;
1490         rtmsg.rtmsg_info = expires;
1491         rtmsg.rtmsg_flags = RTF_UP|flags;
1492         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1493
1494         /* Prevent useless cloning on PtP SIT.
1495            This thing is done here expecting that the whole
1496            class of non-broadcast devices need not cloning.
1497          */
1498         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1499                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1500
1501         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1502 }
1503
1504 /* Create "default" multicast route to the interface */
1505
1506 static void addrconf_add_mroute(struct net_device *dev)
1507 {
1508         struct in6_rtmsg rtmsg;
1509
1510         memset(&rtmsg, 0, sizeof(rtmsg));
1511         ipv6_addr_set(&rtmsg.rtmsg_dst,
1512                       htonl(0xFF000000), 0, 0, 0);
1513         rtmsg.rtmsg_dst_len = 8;
1514         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1515         rtmsg.rtmsg_ifindex = dev->ifindex;
1516         rtmsg.rtmsg_flags = RTF_UP;
1517         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1518         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1519 }
1520
1521 static void sit_route_add(struct net_device *dev)
1522 {
1523         struct in6_rtmsg rtmsg;
1524
1525         memset(&rtmsg, 0, sizeof(rtmsg));
1526
1527         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1528         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1529
1530         /* prefix length - 96 bits "::d.d.d.d" */
1531         rtmsg.rtmsg_dst_len     = 96;
1532         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1533         rtmsg.rtmsg_ifindex     = dev->ifindex;
1534
1535         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1536 }
1537
1538 static void addrconf_add_lroute(struct net_device *dev)
1539 {
1540         struct in6_addr addr;
1541
1542         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1543         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1544 }
1545
1546 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1547 {
1548         struct inet6_dev *idev;
1549
1550         ASSERT_RTNL();
1551
1552         if ((idev = ipv6_find_idev(dev)) == NULL)
1553                 return NULL;
1554
1555         /* Add default multicast route */
1556         addrconf_add_mroute(dev);
1557
1558         /* Add link local route */
1559         addrconf_add_lroute(dev);
1560         return idev;
1561 }
1562
1563 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1564 {
1565         struct prefix_info *pinfo;
1566         __u32 valid_lft;
1567         __u32 prefered_lft;
1568         int addr_type;
1569         unsigned long rt_expires;
1570         struct inet6_dev *in6_dev;
1571
1572         pinfo = (struct prefix_info *) opt;
1573
1574         if (len < sizeof(struct prefix_info)) {
1575                 ADBG(("addrconf: prefix option too short\n"));
1576                 return;
1577         }
1578
1579         /*
1580          *      Validation checks ([ADDRCONF], page 19)
1581          */
1582
1583         addr_type = ipv6_addr_type(&pinfo->prefix);
1584
1585         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1586                 return;
1587
1588         valid_lft = ntohl(pinfo->valid);
1589         prefered_lft = ntohl(pinfo->prefered);
1590
1591         if (prefered_lft > valid_lft) {
1592                 if (net_ratelimit())
1593                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1594                 return;
1595         }
1596
1597         in6_dev = in6_dev_get(dev);
1598
1599         if (in6_dev == NULL) {
1600                 if (net_ratelimit())
1601                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1602                 return;
1603         }
1604
1605         /*
1606          *      Two things going on here:
1607          *      1) Add routes for on-link prefixes
1608          *      2) Configure prefixes with the auto flag set
1609          */
1610
1611         /* Avoid arithmetic overflow. Really, we could
1612            save rt_expires in seconds, likely valid_lft,
1613            but it would require division in fib gc, that it
1614            not good.
1615          */
1616         if (valid_lft >= 0x7FFFFFFF/HZ)
1617                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1618         else
1619                 rt_expires = valid_lft * HZ;
1620
1621         /*
1622          * We convert this (in jiffies) to clock_t later.
1623          * Avoid arithmetic overflow there as well.
1624          * Overflow can happen only if HZ < USER_HZ.
1625          */
1626         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1627                 rt_expires = 0x7FFFFFFF / USER_HZ;
1628
1629         if (pinfo->onlink) {
1630                 struct rt6_info *rt;
1631                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1632
1633                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1634                         if (rt->rt6i_flags&RTF_EXPIRES) {
1635                                 if (valid_lft == 0) {
1636                                         ip6_del_rt(rt, NULL, NULL, NULL);
1637                                         rt = NULL;
1638                                 } else {
1639                                         rt->rt6i_expires = jiffies + rt_expires;
1640                                 }
1641                         }
1642                 } else if (valid_lft) {
1643                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1644                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1645                 }
1646                 if (rt)
1647                         dst_release(&rt->u.dst);
1648         }
1649
1650         /* Try to figure out our local address for this prefix */
1651
1652         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1653                 struct inet6_ifaddr * ifp;
1654                 struct in6_addr addr;
1655                 int create = 0, update_lft = 0;
1656
1657                 if (pinfo->prefix_len == 64) {
1658                         memcpy(&addr, &pinfo->prefix, 8);
1659                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1660                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1661                                 in6_dev_put(in6_dev);
1662                                 return;
1663                         }
1664                         goto ok;
1665                 }
1666                 if (net_ratelimit())
1667                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1668                                pinfo->prefix_len);
1669                 in6_dev_put(in6_dev);
1670                 return;
1671
1672 ok:
1673
1674                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1675
1676                 if (ifp == NULL && valid_lft) {
1677                         int max_addresses = in6_dev->cnf.max_addresses;
1678
1679                         /* Do not allow to create too much of autoconfigured
1680                          * addresses; this would be too easy way to crash kernel.
1681                          */
1682                         if (!max_addresses ||
1683                             ipv6_count_addresses(in6_dev) < max_addresses)
1684                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1685                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1686
1687                         if (!ifp || IS_ERR(ifp)) {
1688                                 in6_dev_put(in6_dev);
1689                                 return;
1690                         }
1691
1692                         update_lft = create = 1;
1693                         ifp->cstamp = jiffies;
1694                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1695                 }
1696
1697                 if (ifp) {
1698                         int flags;
1699                         unsigned long now;
1700 #ifdef CONFIG_IPV6_PRIVACY
1701                         struct inet6_ifaddr *ift;
1702 #endif
1703                         u32 stored_lft;
1704
1705                         /* update lifetime (RFC2462 5.5.3 e) */
1706                         spin_lock(&ifp->lock);
1707                         now = jiffies;
1708                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1709                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1710                         else
1711                                 stored_lft = 0;
1712                         if (!update_lft && stored_lft) {
1713                                 if (valid_lft > MIN_VALID_LIFETIME ||
1714                                     valid_lft > stored_lft)
1715                                         update_lft = 1;
1716                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1717                                         /* valid_lft <= stored_lft is always true */
1718                                         /* XXX: IPsec */
1719                                         update_lft = 0;
1720                                 } else {
1721                                         valid_lft = MIN_VALID_LIFETIME;
1722                                         if (valid_lft < prefered_lft)
1723                                                 prefered_lft = valid_lft;
1724                                         update_lft = 1;
1725                                 }
1726                         }
1727
1728                         if (update_lft) {
1729                                 ifp->valid_lft = valid_lft;
1730                                 ifp->prefered_lft = prefered_lft;
1731                                 ifp->tstamp = now;
1732                                 flags = ifp->flags;
1733                                 ifp->flags &= ~IFA_F_DEPRECATED;
1734                                 spin_unlock(&ifp->lock);
1735
1736                                 if (!(flags&IFA_F_TENTATIVE))
1737                                         ipv6_ifa_notify(0, ifp);
1738                         } else
1739                                 spin_unlock(&ifp->lock);
1740
1741 #ifdef CONFIG_IPV6_PRIVACY
1742                         read_lock_bh(&in6_dev->lock);
1743                         /* update all temporary addresses in the list */
1744                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1745                                 /*
1746                                  * When adjusting the lifetimes of an existing
1747                                  * temporary address, only lower the lifetimes.
1748                                  * Implementations must not increase the
1749                                  * lifetimes of an existing temporary address
1750                                  * when processing a Prefix Information Option.
1751                                  */
1752                                 spin_lock(&ift->lock);
1753                                 flags = ift->flags;
1754                                 if (ift->valid_lft > valid_lft &&
1755                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1756                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1757                                 if (ift->prefered_lft > prefered_lft &&
1758                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1759                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1760                                 spin_unlock(&ift->lock);
1761                                 if (!(flags&IFA_F_TENTATIVE))
1762                                         ipv6_ifa_notify(0, ift);
1763                         }
1764
1765                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1766                                 /*
1767                                  * When a new public address is created as described in [ADDRCONF],
1768                                  * also create a new temporary address.
1769                                  */
1770                                 read_unlock_bh(&in6_dev->lock);
1771                                 ipv6_create_tempaddr(ifp, NULL);
1772                         } else {
1773                                 read_unlock_bh(&in6_dev->lock);
1774                         }
1775 #endif
1776                         in6_ifa_put(ifp);
1777                         addrconf_verify(0);
1778                 }
1779         }
1780         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1781         in6_dev_put(in6_dev);
1782 }
1783
1784 /*
1785  *      Set destination address.
1786  *      Special case for SIT interfaces where we create a new "virtual"
1787  *      device.
1788  */
1789 int addrconf_set_dstaddr(void __user *arg)
1790 {
1791         struct in6_ifreq ireq;
1792         struct net_device *dev;
1793         int err = -EINVAL;
1794
1795         rtnl_lock();
1796
1797         err = -EFAULT;
1798         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1799                 goto err_exit;
1800
1801         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1802
1803         err = -ENODEV;
1804         if (dev == NULL)
1805                 goto err_exit;
1806
1807         if (dev->type == ARPHRD_SIT) {
1808                 struct ifreq ifr;
1809                 mm_segment_t    oldfs;
1810                 struct ip_tunnel_parm p;
1811
1812                 err = -EADDRNOTAVAIL;
1813                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1814                         goto err_exit;
1815
1816                 memset(&p, 0, sizeof(p));
1817                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1818                 p.iph.saddr = 0;
1819                 p.iph.version = 4;
1820                 p.iph.ihl = 5;
1821                 p.iph.protocol = IPPROTO_IPV6;
1822                 p.iph.ttl = 64;
1823                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1824
1825                 oldfs = get_fs(); set_fs(KERNEL_DS);
1826                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1827                 set_fs(oldfs);
1828
1829                 if (err == 0) {
1830                         err = -ENOBUFS;
1831                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1832                                 goto err_exit;
1833                         err = dev_open(dev);
1834                 }
1835         }
1836
1837 err_exit:
1838         rtnl_unlock();
1839         return err;
1840 }
1841
1842 /*
1843  *      Manual configuration of address on an interface
1844  */
1845 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1846 {
1847         struct inet6_ifaddr *ifp;
1848         struct inet6_dev *idev;
1849         struct net_device *dev;
1850         int scope;
1851
1852         ASSERT_RTNL();
1853
1854         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1855                 return -ENODEV;
1856
1857         if (!(dev->flags&IFF_UP))
1858                 return -ENETDOWN;
1859
1860         if ((idev = addrconf_add_dev(dev)) == NULL)
1861                 return -ENOBUFS;
1862
1863         scope = ipv6_addr_scope(pfx);
1864
1865         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1866         if (!IS_ERR(ifp)) {
1867                 addrconf_dad_start(ifp, 0);
1868                 in6_ifa_put(ifp);
1869                 return 0;
1870         }
1871
1872         return PTR_ERR(ifp);
1873 }
1874
1875 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1876 {
1877         struct inet6_ifaddr *ifp;
1878         struct inet6_dev *idev;
1879         struct net_device *dev;
1880
1881         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1882                 return -ENODEV;
1883
1884         if ((idev = __in6_dev_get(dev)) == NULL)
1885                 return -ENXIO;
1886
1887         read_lock_bh(&idev->lock);
1888         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1889                 if (ifp->prefix_len == plen &&
1890                     ipv6_addr_equal(pfx, &ifp->addr)) {
1891                         in6_ifa_hold(ifp);
1892                         read_unlock_bh(&idev->lock);
1893
1894                         ipv6_del_addr(ifp);
1895
1896                         /* If the last address is deleted administratively,
1897                            disable IPv6 on this interface.
1898                          */
1899                         if (idev->addr_list == NULL)
1900                                 addrconf_ifdown(idev->dev, 1);
1901                         return 0;
1902                 }
1903         }
1904         read_unlock_bh(&idev->lock);
1905         return -EADDRNOTAVAIL;
1906 }
1907
1908
1909 int addrconf_add_ifaddr(void __user *arg)
1910 {
1911         struct in6_ifreq ireq;
1912         int err;
1913
1914         if (!capable(CAP_NET_ADMIN))
1915                 return -EPERM;
1916
1917         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1918                 return -EFAULT;
1919
1920         rtnl_lock();
1921         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1922         rtnl_unlock();
1923         return err;
1924 }
1925
1926 int addrconf_del_ifaddr(void __user *arg)
1927 {
1928         struct in6_ifreq ireq;
1929         int err;
1930
1931         if (!capable(CAP_NET_ADMIN))
1932                 return -EPERM;
1933
1934         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1935                 return -EFAULT;
1936
1937         rtnl_lock();
1938         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1939         rtnl_unlock();
1940         return err;
1941 }
1942
1943 static void sit_add_v4_addrs(struct inet6_dev *idev)
1944 {
1945         struct inet6_ifaddr * ifp;
1946         struct in6_addr addr;
1947         struct net_device *dev;
1948         int scope;
1949
1950         ASSERT_RTNL();
1951
1952         memset(&addr, 0, sizeof(struct in6_addr));
1953         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1954
1955         if (idev->dev->flags&IFF_POINTOPOINT) {
1956                 addr.s6_addr32[0] = htonl(0xfe800000);
1957                 scope = IFA_LINK;
1958         } else {
1959                 scope = IPV6_ADDR_COMPATv4;
1960         }
1961
1962         if (addr.s6_addr32[3]) {
1963                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1964                 if (!IS_ERR(ifp)) {
1965                         spin_lock_bh(&ifp->lock);
1966                         ifp->flags &= ~IFA_F_TENTATIVE;
1967                         spin_unlock_bh(&ifp->lock);
1968                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1969                         in6_ifa_put(ifp);
1970                 }
1971                 return;
1972         }
1973
1974         for (dev = dev_base; dev != NULL; dev = dev->next) {
1975                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1976                 if (in_dev && (dev->flags & IFF_UP)) {
1977                         struct in_ifaddr * ifa;
1978
1979                         int flag = scope;
1980
1981                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1982                                 int plen;
1983
1984                                 addr.s6_addr32[3] = ifa->ifa_local;
1985
1986                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1987                                         continue;
1988                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1989                                         if (idev->dev->flags&IFF_POINTOPOINT)
1990                                                 continue;
1991                                         flag |= IFA_HOST;
1992                                 }
1993                                 if (idev->dev->flags&IFF_POINTOPOINT)
1994                                         plen = 64;
1995                                 else
1996                                         plen = 96;
1997
1998                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1999                                                     IFA_F_PERMANENT);
2000                                 if (!IS_ERR(ifp)) {
2001                                         spin_lock_bh(&ifp->lock);
2002                                         ifp->flags &= ~IFA_F_TENTATIVE;
2003                                         spin_unlock_bh(&ifp->lock);
2004                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2005                                         in6_ifa_put(ifp);
2006                                 }
2007                         }
2008                 }
2009         }
2010 }
2011
2012 static void init_loopback(struct net_device *dev)
2013 {
2014         struct inet6_dev  *idev;
2015         struct inet6_ifaddr * ifp;
2016
2017         /* ::1 */
2018
2019         ASSERT_RTNL();
2020
2021         if ((idev = ipv6_find_idev(dev)) == NULL) {
2022                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2023                 return;
2024         }
2025
2026         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2027         if (!IS_ERR(ifp)) {
2028                 spin_lock_bh(&ifp->lock);
2029                 ifp->flags &= ~IFA_F_TENTATIVE;
2030                 spin_unlock_bh(&ifp->lock);
2031                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2032                 in6_ifa_put(ifp);
2033         }
2034 }
2035
2036 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2037 {
2038         struct inet6_ifaddr * ifp;
2039
2040         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2041         if (!IS_ERR(ifp)) {
2042                 addrconf_dad_start(ifp, 0);
2043                 in6_ifa_put(ifp);
2044         }
2045 }
2046
2047 static void addrconf_dev_config(struct net_device *dev)
2048 {
2049         struct in6_addr addr;
2050         struct inet6_dev    * idev;
2051
2052         ASSERT_RTNL();
2053
2054         if ((dev->type != ARPHRD_ETHER) &&
2055             (dev->type != ARPHRD_FDDI) &&
2056             (dev->type != ARPHRD_IEEE802_TR) &&
2057             (dev->type != ARPHRD_ARCNET) &&
2058             (dev->type != ARPHRD_INFINIBAND)) {
2059                 /* Alas, we support only Ethernet autoconfiguration. */
2060                 return;
2061         }
2062
2063         idev = addrconf_add_dev(dev);
2064         if (idev == NULL)
2065                 return;
2066
2067         memset(&addr, 0, sizeof(struct in6_addr));
2068         addr.s6_addr32[0] = htonl(0xFE800000);
2069
2070         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2071                 addrconf_add_linklocal(idev, &addr);
2072 }
2073
2074 static void addrconf_sit_config(struct net_device *dev)
2075 {
2076         struct inet6_dev *idev;
2077
2078         ASSERT_RTNL();
2079
2080         /*
2081          * Configure the tunnel with one of our IPv4
2082          * addresses... we should configure all of
2083          * our v4 addrs in the tunnel
2084          */
2085
2086         if ((idev = ipv6_find_idev(dev)) == NULL) {
2087                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2088                 return;
2089         }
2090
2091         sit_add_v4_addrs(idev);
2092
2093         if (dev->flags&IFF_POINTOPOINT) {
2094                 addrconf_add_mroute(dev);
2095                 addrconf_add_lroute(dev);
2096         } else
2097                 sit_route_add(dev);
2098 }
2099
2100 static inline int
2101 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2102 {
2103         struct in6_addr lladdr;
2104
2105         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2106                 addrconf_add_linklocal(idev, &lladdr);
2107                 return 0;
2108         }
2109         return -1;
2110 }
2111
2112 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2113 {
2114         struct net_device *link_dev;
2115
2116         /* first try to inherit the link-local address from the link device */
2117         if (idev->dev->iflink &&
2118             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2119                 if (!ipv6_inherit_linklocal(idev, link_dev))
2120                         return;
2121         }
2122         /* then try to inherit it from any device */
2123         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2124                 if (!ipv6_inherit_linklocal(idev, link_dev))
2125                         return;
2126         }
2127         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2128 }
2129
2130 /*
2131  * Autoconfigure tunnel with a link-local address so routing protocols,
2132  * DHCPv6, MLD etc. can be run over the virtual link
2133  */
2134
2135 static void addrconf_ip6_tnl_config(struct net_device *dev)
2136 {
2137         struct inet6_dev *idev;
2138
2139         ASSERT_RTNL();
2140
2141         if ((idev = addrconf_add_dev(dev)) == NULL) {
2142                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2143                 return;
2144         }
2145         ip6_tnl_add_linklocal(idev);
2146         addrconf_add_mroute(dev);
2147 }
2148
2149 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2150                            void * data)
2151 {
2152         struct net_device *dev = (struct net_device *) data;
2153         struct inet6_dev *idev = __in6_dev_get(dev);
2154         int run_pending = 0;
2155
2156         switch(event) {
2157         case NETDEV_UP:
2158         case NETDEV_CHANGE:
2159                 if (event == NETDEV_UP) {
2160                         if (!netif_carrier_ok(dev)) {
2161                                 /* device is not ready yet. */
2162                                 printk(KERN_INFO
2163                                         "ADDRCONF(NETDEV_UP): %s: "
2164                                         "link is not ready\n",
2165                                         dev->name);
2166                                 break;
2167                         }
2168
2169                         if (idev)
2170                                 idev->if_flags |= IF_READY;
2171                 } else {
2172                         if (!netif_carrier_ok(dev)) {
2173                                 /* device is still not ready. */
2174                                 break;
2175                         }
2176
2177                         if (idev) {
2178                                 if (idev->if_flags & IF_READY) {
2179                                         /* device is already configured. */
2180                                         break;
2181                                 }
2182                                 idev->if_flags |= IF_READY;
2183                         }
2184
2185                         printk(KERN_INFO
2186                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2187                                         "link becomes ready\n",
2188                                         dev->name);
2189
2190                         run_pending = 1;
2191                 }
2192
2193                 switch(dev->type) {
2194                 case ARPHRD_SIT:
2195                         addrconf_sit_config(dev);
2196                         break;
2197                 case ARPHRD_TUNNEL6:
2198                         addrconf_ip6_tnl_config(dev);
2199                         break;
2200                 case ARPHRD_LOOPBACK:
2201                         init_loopback(dev);
2202                         break;
2203
2204                 default:
2205                         addrconf_dev_config(dev);
2206                         break;
2207                 };
2208                 if (idev) {
2209                         if (run_pending)
2210                                 addrconf_dad_run(idev);
2211
2212                         /* If the MTU changed during the interface down, when the
2213                            interface up, the changed MTU must be reflected in the
2214                            idev as well as routers.
2215                          */
2216                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2217                                 rt6_mtu_change(dev, dev->mtu);
2218                                 idev->cnf.mtu6 = dev->mtu;
2219                         }
2220                         idev->tstamp = jiffies;
2221                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2222                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2223                            stop IPv6 on this interface.
2224                          */
2225                         if (dev->mtu < IPV6_MIN_MTU)
2226                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2227                 }
2228                 break;
2229
2230         case NETDEV_CHANGEMTU:
2231                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2232                         rt6_mtu_change(dev, dev->mtu);
2233                         idev->cnf.mtu6 = dev->mtu;
2234                         break;
2235                 }
2236
2237                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2238
2239         case NETDEV_DOWN:
2240         case NETDEV_UNREGISTER:
2241                 /*
2242                  *      Remove all addresses from this interface.
2243                  */
2244                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2245                 break;
2246
2247         case NETDEV_CHANGENAME:
2248 #ifdef CONFIG_SYSCTL
2249                 if (idev) {
2250                         addrconf_sysctl_unregister(&idev->cnf);
2251                         neigh_sysctl_unregister(idev->nd_parms);
2252                         neigh_sysctl_register(dev, idev->nd_parms,
2253                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2254                                               &ndisc_ifinfo_sysctl_change,
2255                                               NULL);
2256                         addrconf_sysctl_register(idev, &idev->cnf);
2257                 }
2258 #endif
2259                 break;
2260         };
2261
2262         return NOTIFY_OK;
2263 }
2264
2265 /*
2266  *      addrconf module should be notified of a device going up
2267  */
2268 static struct notifier_block ipv6_dev_notf = {
2269         .notifier_call = addrconf_notify,
2270         .priority = 0
2271 };
2272
2273 static int addrconf_ifdown(struct net_device *dev, int how)
2274 {
2275         struct inet6_dev *idev;
2276         struct inet6_ifaddr *ifa, **bifa;
2277         int i;
2278
2279         ASSERT_RTNL();
2280
2281         if (dev == &loopback_dev && how == 1)
2282                 how = 0;
2283
2284         rt6_ifdown(dev);
2285         neigh_ifdown(&nd_tbl, dev);
2286
2287         idev = __in6_dev_get(dev);
2288         if (idev == NULL)
2289                 return -ENODEV;
2290
2291         /* Step 1: remove reference to ipv6 device from parent device.
2292                    Do not dev_put!
2293          */
2294         if (how == 1) {
2295                 write_lock_bh(&addrconf_lock);
2296                 dev->ip6_ptr = NULL;
2297                 idev->dead = 1;
2298                 write_unlock_bh(&addrconf_lock);
2299
2300                 /* Step 1.5: remove snmp6 entry */
2301                 snmp6_unregister_dev(idev);
2302
2303         }
2304
2305         /* Step 2: clear hash table */
2306         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2307                 bifa = &inet6_addr_lst[i];
2308
2309                 write_lock_bh(&addrconf_hash_lock);
2310                 while ((ifa = *bifa) != NULL) {
2311                         if (ifa->idev == idev) {
2312                                 *bifa = ifa->lst_next;
2313                                 ifa->lst_next = NULL;
2314                                 addrconf_del_timer(ifa);
2315                                 in6_ifa_put(ifa);
2316                                 continue;
2317                         }
2318                         bifa = &ifa->lst_next;
2319                 }
2320                 write_unlock_bh(&addrconf_hash_lock);
2321         }
2322
2323         write_lock_bh(&idev->lock);
2324
2325         /* Step 3: clear flags for stateless addrconf */
2326         if (how != 1)
2327                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2328
2329         /* Step 4: clear address list */
2330 #ifdef CONFIG_IPV6_PRIVACY
2331         if (how == 1 && del_timer(&idev->regen_timer))
2332                 in6_dev_put(idev);
2333
2334         /* clear tempaddr list */
2335         while ((ifa = idev->tempaddr_list) != NULL) {
2336                 idev->tempaddr_list = ifa->tmp_next;
2337                 ifa->tmp_next = NULL;
2338                 ifa->dead = 1;
2339                 write_unlock_bh(&idev->lock);
2340                 spin_lock_bh(&ifa->lock);
2341
2342                 if (ifa->ifpub) {
2343                         in6_ifa_put(ifa->ifpub);
2344                         ifa->ifpub = NULL;
2345                 }
2346                 spin_unlock_bh(&ifa->lock);
2347                 in6_ifa_put(ifa);
2348                 write_lock_bh(&idev->lock);
2349         }
2350 #endif
2351         while ((ifa = idev->addr_list) != NULL) {
2352                 idev->addr_list = ifa->if_next;
2353                 ifa->if_next = NULL;
2354                 ifa->dead = 1;
2355                 addrconf_del_timer(ifa);
2356                 write_unlock_bh(&idev->lock);
2357
2358                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2359                 in6_ifa_put(ifa);
2360
2361                 write_lock_bh(&idev->lock);
2362         }
2363         write_unlock_bh(&idev->lock);
2364
2365         /* Step 5: Discard multicast list */
2366
2367         if (how == 1)
2368                 ipv6_mc_destroy_dev(idev);
2369         else
2370                 ipv6_mc_down(idev);
2371
2372         /* Step 5: netlink notification of this interface */
2373         idev->tstamp = jiffies;
2374         inet6_ifinfo_notify(RTM_DELLINK, idev);
2375
2376         /* Shot the device (if unregistered) */
2377
2378         if (how == 1) {
2379 #ifdef CONFIG_SYSCTL
2380                 addrconf_sysctl_unregister(&idev->cnf);
2381                 neigh_sysctl_unregister(idev->nd_parms);
2382 #endif
2383                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2384                 neigh_ifdown(&nd_tbl, dev);
2385                 in6_dev_put(idev);
2386         }
2387         return 0;
2388 }
2389
2390 static void addrconf_rs_timer(unsigned long data)
2391 {
2392         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2393
2394         if (ifp->idev->cnf.forwarding)
2395                 goto out;
2396
2397         if (ifp->idev->if_flags & IF_RA_RCVD) {
2398                 /*
2399                  *      Announcement received after solicitation
2400                  *      was sent
2401                  */
2402                 goto out;
2403         }
2404
2405         spin_lock(&ifp->lock);
2406         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2407                 struct in6_addr all_routers;
2408
2409                 /* The wait after the last probe can be shorter */
2410                 addrconf_mod_timer(ifp, AC_RS,
2411                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2412                                    ifp->idev->cnf.rtr_solicit_delay :
2413                                    ifp->idev->cnf.rtr_solicit_interval);
2414                 spin_unlock(&ifp->lock);
2415
2416                 ipv6_addr_all_routers(&all_routers);
2417
2418                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2419         } else {
2420                 spin_unlock(&ifp->lock);
2421                 /*
2422                  * Note: we do not support deprecated "all on-link"
2423                  * assumption any longer.
2424                  */
2425                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2426                        ifp->idev->dev->name);
2427         }
2428
2429 out:
2430         in6_ifa_put(ifp);
2431 }
2432
2433 /*
2434  *      Duplicate Address Detection
2435  */
2436 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2437 {
2438         unsigned long rand_num;
2439         struct inet6_dev *idev = ifp->idev;
2440
2441         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2442         ifp->probes = idev->cnf.dad_transmits;
2443         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2444 }
2445
2446 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2447 {
2448         struct inet6_dev *idev = ifp->idev;
2449         struct net_device *dev = idev->dev;
2450
2451         addrconf_join_solict(dev, &ifp->addr);
2452
2453         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2454                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2455                                         flags);
2456
2457         net_srandom(ifp->addr.s6_addr32[3]);
2458
2459         read_lock_bh(&idev->lock);
2460         if (ifp->dead)
2461                 goto out;
2462         spin_lock_bh(&ifp->lock);
2463
2464         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2465             !(ifp->flags&IFA_F_TENTATIVE)) {
2466                 ifp->flags &= ~IFA_F_TENTATIVE;
2467                 spin_unlock_bh(&ifp->lock);
2468                 read_unlock_bh(&idev->lock);
2469
2470                 addrconf_dad_completed(ifp);
2471                 return;
2472         }
2473
2474         if (!(idev->if_flags & IF_READY)) {
2475                 spin_unlock_bh(&ifp->lock);
2476                 read_unlock_bh(&idev->lock);
2477                 /*
2478                  * If the defice is not ready:
2479                  * - keep it tentative if it is a permanent address.
2480                  * - otherwise, kill it.
2481                  */
2482                 in6_ifa_hold(ifp);
2483                 addrconf_dad_stop(ifp);
2484                 return;
2485         }
2486         addrconf_dad_kick(ifp);
2487         spin_unlock_bh(&ifp->lock);
2488 out:
2489         read_unlock_bh(&idev->lock);
2490 }
2491
2492 static void addrconf_dad_timer(unsigned long data)
2493 {
2494         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2495         struct inet6_dev *idev = ifp->idev;
2496         struct in6_addr unspec;
2497         struct in6_addr mcaddr;
2498
2499         read_lock_bh(&idev->lock);
2500         if (idev->dead) {
2501                 read_unlock_bh(&idev->lock);
2502                 goto out;
2503         }
2504         spin_lock_bh(&ifp->lock);
2505         if (ifp->probes == 0) {
2506                 /*
2507                  * DAD was successful
2508                  */
2509
2510                 ifp->flags &= ~IFA_F_TENTATIVE;
2511                 spin_unlock_bh(&ifp->lock);
2512                 read_unlock_bh(&idev->lock);
2513
2514                 addrconf_dad_completed(ifp);
2515
2516                 goto out;
2517         }
2518
2519         ifp->probes--;
2520         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2521         spin_unlock_bh(&ifp->lock);
2522         read_unlock_bh(&idev->lock);
2523
2524         /* send a neighbour solicitation for our addr */
2525         memset(&unspec, 0, sizeof(unspec));
2526         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2527         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2528 out:
2529         in6_ifa_put(ifp);
2530 }
2531
2532 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2533 {
2534         struct net_device *     dev = ifp->idev->dev;
2535
2536         /*
2537          *      Configure the address for reception. Now it is valid.
2538          */
2539
2540         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2541
2542         /* If added prefix is link local and forwarding is off,
2543            start sending router solicitations.
2544          */
2545
2546         if (ifp->idev->cnf.forwarding == 0 &&
2547             ifp->idev->cnf.rtr_solicits > 0 &&
2548             (dev->flags&IFF_LOOPBACK) == 0 &&
2549             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2550                 struct in6_addr all_routers;
2551
2552                 ipv6_addr_all_routers(&all_routers);
2553
2554                 /*
2555                  *      If a host as already performed a random delay
2556                  *      [...] as part of DAD [...] there is no need
2557                  *      to delay again before sending the first RS
2558                  */
2559                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2560
2561                 spin_lock_bh(&ifp->lock);
2562                 ifp->probes = 1;
2563                 ifp->idev->if_flags |= IF_RS_SENT;
2564                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2565                 spin_unlock_bh(&ifp->lock);
2566         }
2567 }
2568
2569 static void addrconf_dad_run(struct inet6_dev *idev) {
2570         struct inet6_ifaddr *ifp;
2571
2572         read_lock_bh(&idev->lock);
2573         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2574                 spin_lock_bh(&ifp->lock);
2575                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2576                         spin_unlock_bh(&ifp->lock);
2577                         continue;
2578                 }
2579                 spin_unlock_bh(&ifp->lock);
2580                 addrconf_dad_kick(ifp);
2581         }
2582         read_unlock_bh(&idev->lock);
2583 }
2584
2585 #ifdef CONFIG_PROC_FS
2586 struct if6_iter_state {
2587         int bucket;
2588 };
2589
2590 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2591 {
2592         struct inet6_ifaddr *ifa = NULL;
2593         struct if6_iter_state *state = seq->private;
2594
2595         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2596                 ifa = inet6_addr_lst[state->bucket];
2597                 if (ifa)
2598                         break;
2599         }
2600         return ifa;
2601 }
2602
2603 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2604 {
2605         struct if6_iter_state *state = seq->private;
2606
2607         ifa = ifa->lst_next;
2608 try_again:
2609         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2610                 ifa = inet6_addr_lst[state->bucket];
2611                 goto try_again;
2612         }
2613         return ifa;
2614 }
2615
2616 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2617 {
2618         struct inet6_ifaddr *ifa = if6_get_first(seq);
2619
2620         if (ifa)
2621                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2622                         --pos;
2623         return pos ? NULL : ifa;
2624 }
2625
2626 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2627 {
2628         read_lock_bh(&addrconf_hash_lock);
2629         return if6_get_idx(seq, *pos);
2630 }
2631
2632 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2633 {
2634         struct inet6_ifaddr *ifa;
2635
2636         ifa = if6_get_next(seq, v);
2637         ++*pos;
2638         return ifa;
2639 }
2640
2641 static void if6_seq_stop(struct seq_file *seq, void *v)
2642 {
2643         read_unlock_bh(&addrconf_hash_lock);
2644 }
2645
2646 static int if6_seq_show(struct seq_file *seq, void *v)
2647 {
2648         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2649         seq_printf(seq,
2650                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2651                    NIP6(ifp->addr),
2652                    ifp->idev->dev->ifindex,
2653                    ifp->prefix_len,
2654                    ifp->scope,
2655                    ifp->flags,
2656                    ifp->idev->dev->name);
2657         return 0;
2658 }
2659
2660 static struct seq_operations if6_seq_ops = {
2661         .start  = if6_seq_start,
2662         .next   = if6_seq_next,
2663         .show   = if6_seq_show,
2664         .stop   = if6_seq_stop,
2665 };
2666
2667 static int if6_seq_open(struct inode *inode, struct file *file)
2668 {
2669         struct seq_file *seq;
2670         int rc = -ENOMEM;
2671         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2672
2673         if (!s)
2674                 goto out;
2675         memset(s, 0, sizeof(*s));
2676
2677         rc = seq_open(file, &if6_seq_ops);
2678         if (rc)
2679                 goto out_kfree;
2680
2681         seq = file->private_data;
2682         seq->private = s;
2683 out:
2684         return rc;
2685 out_kfree:
2686         kfree(s);
2687         goto out;
2688 }
2689
2690 static struct file_operations if6_fops = {
2691         .owner          = THIS_MODULE,
2692         .open           = if6_seq_open,
2693         .read           = seq_read,
2694         .llseek         = seq_lseek,
2695         .release        = seq_release_private,
2696 };
2697
2698 int __init if6_proc_init(void)
2699 {
2700         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2701                 return -ENOMEM;
2702         return 0;
2703 }
2704
2705 void if6_proc_exit(void)
2706 {
2707         proc_net_remove("if_inet6");
2708 }
2709 #endif  /* CONFIG_PROC_FS */
2710
2711 /*
2712  *      Periodic address status verification
2713  */
2714
2715 static void addrconf_verify(unsigned long foo)
2716 {
2717         struct inet6_ifaddr *ifp;
2718         unsigned long now, next;
2719         int i;
2720
2721         spin_lock_bh(&addrconf_verify_lock);
2722         now = jiffies;
2723         next = now + ADDR_CHECK_FREQUENCY;
2724
2725         del_timer(&addr_chk_timer);
2726
2727         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2728
2729 restart:
2730                 read_lock(&addrconf_hash_lock);
2731                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2732                         unsigned long age;
2733 #ifdef CONFIG_IPV6_PRIVACY
2734                         unsigned long regen_advance;
2735 #endif
2736
2737                         if (ifp->flags & IFA_F_PERMANENT)
2738                                 continue;
2739
2740                         spin_lock(&ifp->lock);
2741                         age = (now - ifp->tstamp) / HZ;
2742
2743 #ifdef CONFIG_IPV6_PRIVACY
2744                         regen_advance = ifp->idev->cnf.regen_max_retry *
2745                                         ifp->idev->cnf.dad_transmits *
2746                                         ifp->idev->nd_parms->retrans_time / HZ;
2747 #endif
2748
2749                         if (age >= ifp->valid_lft) {
2750                                 spin_unlock(&ifp->lock);
2751                                 in6_ifa_hold(ifp);
2752                                 read_unlock(&addrconf_hash_lock);
2753                                 ipv6_del_addr(ifp);
2754                                 goto restart;
2755                         } else if (age >= ifp->prefered_lft) {
2756                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2757                                 int deprecate = 0;
2758
2759                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2760                                         deprecate = 1;
2761                                         ifp->flags |= IFA_F_DEPRECATED;
2762                                 }
2763
2764                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2765                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2766
2767                                 spin_unlock(&ifp->lock);
2768
2769                                 if (deprecate) {
2770                                         in6_ifa_hold(ifp);
2771                                         read_unlock(&addrconf_hash_lock);
2772
2773                                         ipv6_ifa_notify(0, ifp);
2774                                         in6_ifa_put(ifp);
2775                                         goto restart;
2776                                 }
2777 #ifdef CONFIG_IPV6_PRIVACY
2778                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2779                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2780                                 if (age >= ifp->prefered_lft - regen_advance) {
2781                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2782                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2783                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2784                                         if (!ifp->regen_count && ifpub) {
2785                                                 ifp->regen_count++;
2786                                                 in6_ifa_hold(ifp);
2787                                                 in6_ifa_hold(ifpub);
2788                                                 spin_unlock(&ifp->lock);
2789                                                 read_unlock(&addrconf_hash_lock);
2790                                                 spin_lock(&ifpub->lock);
2791                                                 ifpub->regen_count = 0;
2792                                                 spin_unlock(&ifpub->lock);
2793                                                 ipv6_create_tempaddr(ifpub, ifp);
2794                                                 in6_ifa_put(ifpub);
2795                                                 in6_ifa_put(ifp);
2796                                                 goto restart;
2797                                         }
2798                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2799                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2800                                 spin_unlock(&ifp->lock);
2801 #endif
2802                         } else {
2803                                 /* ifp->prefered_lft <= ifp->valid_lft */
2804                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2805                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2806                                 spin_unlock(&ifp->lock);
2807                         }
2808                 }
2809                 read_unlock(&addrconf_hash_lock);
2810         }
2811
2812         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2813         add_timer(&addr_chk_timer);
2814         spin_unlock_bh(&addrconf_verify_lock);
2815 }
2816
2817 static int
2818 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2819 {
2820         struct rtattr **rta = arg;
2821         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2822         struct in6_addr *pfx;
2823
2824         pfx = NULL;
2825         if (rta[IFA_ADDRESS-1]) {
2826                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2827                         return -EINVAL;
2828                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2829         }
2830         if (rta[IFA_LOCAL-1]) {
2831                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2832                         return -EINVAL;
2833                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2834         }
2835         if (pfx == NULL)
2836                 return -EINVAL;
2837
2838         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2839 }
2840
2841 static int
2842 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2843 {
2844         struct rtattr  **rta = arg;
2845         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2846         struct in6_addr *pfx;
2847
2848         pfx = NULL;
2849         if (rta[IFA_ADDRESS-1]) {
2850                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2851                         return -EINVAL;
2852                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2853         }
2854         if (rta[IFA_LOCAL-1]) {
2855                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2856                         return -EINVAL;
2857                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2858         }
2859         if (pfx == NULL)
2860                 return -EINVAL;
2861
2862         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2863 }
2864
2865 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2866                              u32 pid, u32 seq, int event, unsigned int flags)
2867 {
2868         struct ifaddrmsg *ifm;
2869         struct nlmsghdr  *nlh;
2870         struct ifa_cacheinfo ci;
2871         unsigned char    *b = skb->tail;
2872
2873         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2874         ifm = NLMSG_DATA(nlh);
2875         ifm->ifa_family = AF_INET6;
2876         ifm->ifa_prefixlen = ifa->prefix_len;
2877         ifm->ifa_flags = ifa->flags;
2878         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2879         if (ifa->scope&IFA_HOST)
2880                 ifm->ifa_scope = RT_SCOPE_HOST;
2881         else if (ifa->scope&IFA_LINK)
2882                 ifm->ifa_scope = RT_SCOPE_LINK;
2883         else if (ifa->scope&IFA_SITE)
2884                 ifm->ifa_scope = RT_SCOPE_SITE;
2885         ifm->ifa_index = ifa->idev->dev->ifindex;
2886         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2887         if (!(ifa->flags&IFA_F_PERMANENT)) {
2888                 ci.ifa_prefered = ifa->prefered_lft;
2889                 ci.ifa_valid = ifa->valid_lft;
2890                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2891                         long tval = (jiffies - ifa->tstamp)/HZ;
2892                         ci.ifa_prefered -= tval;
2893                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2894                                 ci.ifa_valid -= tval;
2895                 }
2896         } else {
2897                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2898                 ci.ifa_valid = INFINITY_LIFE_TIME;
2899         }
2900         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2901                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2902         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2903                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2904         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2905         nlh->nlmsg_len = skb->tail - b;
2906         return skb->len;
2907
2908 nlmsg_failure:
2909 rtattr_failure:
2910         skb_trim(skb, b - skb->data);
2911         return -1;
2912 }
2913
2914 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2915                                 u32 pid, u32 seq, int event, u16 flags)
2916 {
2917         struct ifaddrmsg *ifm;
2918         struct nlmsghdr  *nlh;
2919         struct ifa_cacheinfo ci;
2920         unsigned char    *b = skb->tail;
2921
2922         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2923         ifm = NLMSG_DATA(nlh);
2924         ifm->ifa_family = AF_INET6;
2925         ifm->ifa_prefixlen = 128;
2926         ifm->ifa_flags = IFA_F_PERMANENT;
2927         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2928         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2929                 ifm->ifa_scope = RT_SCOPE_SITE;
2930         ifm->ifa_index = ifmca->idev->dev->ifindex;
2931         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2932         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2933                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2934                     * 100 / HZ);
2935         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2936                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2937                     * 100 / HZ);
2938         ci.ifa_prefered = INFINITY_LIFE_TIME;
2939         ci.ifa_valid = INFINITY_LIFE_TIME;
2940         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2941         nlh->nlmsg_len = skb->tail - b;
2942         return skb->len;
2943
2944 nlmsg_failure:
2945 rtattr_failure:
2946         skb_trim(skb, b - skb->data);
2947         return -1;
2948 }
2949
2950 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2951                                 u32 pid, u32 seq, int event, unsigned int flags)
2952 {
2953         struct ifaddrmsg *ifm;
2954         struct nlmsghdr  *nlh;
2955         struct ifa_cacheinfo ci;
2956         unsigned char    *b = skb->tail;
2957
2958         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2959         ifm = NLMSG_DATA(nlh);
2960         ifm->ifa_family = AF_INET6;
2961         ifm->ifa_prefixlen = 128;
2962         ifm->ifa_flags = IFA_F_PERMANENT;
2963         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2964         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2965                 ifm->ifa_scope = RT_SCOPE_SITE;
2966         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2967         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2968         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2969                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2970                     * 100 / HZ);
2971         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2972                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2973                     * 100 / HZ);
2974         ci.ifa_prefered = INFINITY_LIFE_TIME;
2975         ci.ifa_valid = INFINITY_LIFE_TIME;
2976         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2977         nlh->nlmsg_len = skb->tail - b;
2978         return skb->len;
2979
2980 nlmsg_failure:
2981 rtattr_failure:
2982         skb_trim(skb, b - skb->data);
2983         return -1;
2984 }
2985
2986 enum addr_type_t
2987 {
2988         UNICAST_ADDR,
2989         MULTICAST_ADDR,
2990         ANYCAST_ADDR,
2991 };
2992
2993 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2994                            enum addr_type_t type)
2995 {
2996         int idx, ip_idx;
2997         int s_idx, s_ip_idx;
2998         int err = 1;
2999         struct net_device *dev;
3000         struct inet6_dev *idev = NULL;
3001         struct inet6_ifaddr *ifa;
3002         struct ifmcaddr6 *ifmca;
3003         struct ifacaddr6 *ifaca;
3004
3005         s_idx = cb->args[0];
3006         s_ip_idx = ip_idx = cb->args[1];
3007         read_lock(&dev_base_lock);
3008
3009         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3010                 if (idx < s_idx)
3011                         continue;
3012                 if (idx > s_idx)
3013                         s_ip_idx = 0;
3014                 ip_idx = 0;
3015                 if ((idev = in6_dev_get(dev)) == NULL)
3016                         continue;
3017                 read_lock_bh(&idev->lock);
3018                 switch (type) {
3019                 case UNICAST_ADDR:
3020                         /* unicast address incl. temp addr */
3021                         for (ifa = idev->addr_list; ifa;
3022                              ifa = ifa->if_next, ip_idx++) {
3023                                 if (ip_idx < s_ip_idx)
3024                                         continue;
3025                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3026                                     NETLINK_CB(cb->skb).pid,
3027                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3028                                     NLM_F_MULTI)) <= 0)
3029                                         goto done;
3030                         }
3031                         break;
3032                 case MULTICAST_ADDR:
3033                         /* multicast address */
3034                         for (ifmca = idev->mc_list; ifmca;
3035                              ifmca = ifmca->next, ip_idx++) {
3036                                 if (ip_idx < s_ip_idx)
3037                                         continue;
3038                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3039                                     NETLINK_CB(cb->skb).pid,
3040                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3041                                     NLM_F_MULTI)) <= 0)
3042                                         goto done;
3043                         }
3044                         break;
3045                 case ANYCAST_ADDR:
3046                         /* anycast address */
3047                         for (ifaca = idev->ac_list; ifaca;
3048                              ifaca = ifaca->aca_next, ip_idx++) {
3049                                 if (ip_idx < s_ip_idx)
3050                                         continue;
3051                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3052                                     NETLINK_CB(cb->skb).pid,
3053                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3054                                     NLM_F_MULTI)) <= 0)
3055                                         goto done;
3056                         }
3057                         break;
3058                 default:
3059                         break;
3060                 }
3061                 read_unlock_bh(&idev->lock);
3062                 in6_dev_put(idev);
3063         }
3064 done:
3065         if (err <= 0) {
3066                 read_unlock_bh(&idev->lock);
3067                 in6_dev_put(idev);
3068         }
3069         read_unlock(&dev_base_lock);
3070         cb->args[0] = idx;
3071         cb->args[1] = ip_idx;
3072         return skb->len;
3073 }
3074
3075 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3076 {
3077         enum addr_type_t type = UNICAST_ADDR;
3078         return inet6_dump_addr(skb, cb, type);
3079 }
3080
3081 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3082 {
3083         enum addr_type_t type = MULTICAST_ADDR;
3084         return inet6_dump_addr(skb, cb, type);
3085 }
3086
3087
3088 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3089 {
3090         enum addr_type_t type = ANYCAST_ADDR;
3091         return inet6_dump_addr(skb, cb, type);
3092 }
3093
3094 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3095 {
3096         struct sk_buff *skb;
3097         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3098
3099         skb = alloc_skb(size, GFP_ATOMIC);
3100         if (!skb) {
3101                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3102                 return;
3103         }
3104         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3105                 kfree_skb(skb);
3106                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3107                 return;
3108         }
3109         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3110         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3111 }
3112
3113 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3114                                 __s32 *array, int bytes)
3115 {
3116         memset(array, 0, bytes);
3117         array[DEVCONF_FORWARDING] = cnf->forwarding;
3118         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3119         array[DEVCONF_MTU6] = cnf->mtu6;
3120         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3121         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3122         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3123         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3124         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3125         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3126         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3127         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3128 #ifdef CONFIG_IPV6_PRIVACY
3129         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3130         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3131         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3132         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3133         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3134 #endif
3135         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3136 }
3137
3138 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3139                              u32 pid, u32 seq, int event, unsigned int flags)
3140 {
3141         struct net_device       *dev = idev->dev;
3142         __s32                   *array = NULL;
3143         struct ifinfomsg        *r;
3144         struct nlmsghdr         *nlh;
3145         unsigned char           *b = skb->tail;
3146         struct rtattr           *subattr;
3147         __u32                   mtu = dev->mtu;
3148         struct ifla_cacheinfo   ci;
3149
3150         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3151         r = NLMSG_DATA(nlh);
3152         r->ifi_family = AF_INET6;
3153         r->__ifi_pad = 0;
3154         r->ifi_type = dev->type;
3155         r->ifi_index = dev->ifindex;
3156         r->ifi_flags = dev_get_flags(dev);
3157         r->ifi_change = 0;
3158
3159         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3160
3161         if (dev->addr_len)
3162                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3163
3164         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3165         if (dev->ifindex != dev->iflink)
3166                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3167
3168         subattr = (struct rtattr*)skb->tail;
3169
3170         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3171
3172         /* return the device flags */
3173         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3174
3175         /* return interface cacheinfo */
3176         ci.max_reasm_len = IPV6_MAXPLEN;
3177         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3178                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3179         ci.reachable_time = idev->nd_parms->reachable_time;
3180         ci.retrans_time = idev->nd_parms->retrans_time;
3181         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3182
3183         /* return the device sysctl params */
3184         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3185                 goto rtattr_failure;
3186         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3187         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3188
3189         /* XXX - Statistics/MC not implemented */
3190         subattr->rta_len = skb->tail - (u8*)subattr;
3191
3192         nlh->nlmsg_len = skb->tail - b;
3193         kfree(array);
3194         return skb->len;
3195
3196 nlmsg_failure:
3197 rtattr_failure:
3198         kfree(array);
3199         skb_trim(skb, b - skb->data);
3200         return -1;
3201 }
3202
3203 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3204 {
3205         int idx, err;
3206         int s_idx = cb->args[0];
3207         struct net_device *dev;
3208         struct inet6_dev *idev;
3209
3210         read_lock(&dev_base_lock);
3211         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3212                 if (idx < s_idx)
3213                         continue;
3214                 if ((idev = in6_dev_get(dev)) == NULL)
3215                         continue;
3216                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3217                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3218                 in6_dev_put(idev);
3219                 if (err <= 0)
3220                         break;
3221         }
3222         read_unlock(&dev_base_lock);
3223         cb->args[0] = idx;
3224
3225         return skb->len;
3226 }
3227
3228 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3229 {
3230         struct sk_buff *skb;
3231         /* 128 bytes ?? */
3232         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3233
3234         skb = alloc_skb(size, GFP_ATOMIC);
3235         if (!skb) {
3236                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3237                 return;
3238         }
3239         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3240                 kfree_skb(skb);
3241                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3242                 return;
3243         }
3244         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3245         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3246 }
3247
3248 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3249                         struct prefix_info *pinfo, u32 pid, u32 seq,
3250                         int event, unsigned int flags)
3251 {
3252         struct prefixmsg        *pmsg;
3253         struct nlmsghdr         *nlh;
3254         unsigned char           *b = skb->tail;
3255         struct prefix_cacheinfo ci;
3256
3257         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3258         pmsg = NLMSG_DATA(nlh);
3259         pmsg->prefix_family = AF_INET6;
3260         pmsg->prefix_pad1 = 0;
3261         pmsg->prefix_pad2 = 0;
3262         pmsg->prefix_ifindex = idev->dev->ifindex;
3263         pmsg->prefix_len = pinfo->prefix_len;
3264         pmsg->prefix_type = pinfo->type;
3265         pmsg->prefix_pad3 = 0;
3266
3267         pmsg->prefix_flags = 0;
3268         if (pinfo->onlink)
3269                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3270         if (pinfo->autoconf)
3271                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3272
3273         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3274
3275         ci.preferred_time = ntohl(pinfo->prefered);
3276         ci.valid_time = ntohl(pinfo->valid);
3277         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3278
3279         nlh->nlmsg_len = skb->tail - b;
3280         return skb->len;
3281
3282 nlmsg_failure:
3283 rtattr_failure:
3284         skb_trim(skb, b - skb->data);
3285         return -1;
3286 }
3287
3288 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3289                          struct prefix_info *pinfo)
3290 {
3291         struct sk_buff *skb;
3292         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3293
3294         skb = alloc_skb(size, GFP_ATOMIC);
3295         if (!skb) {
3296                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3297                 return;
3298         }
3299         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3300                 kfree_skb(skb);
3301                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3302                 return;
3303         }
3304         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3305         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3306 }
3307
3308 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3309         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3310         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3311         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3312         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3313         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3314         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3315         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3316         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3317         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3318                                       .dumpit   = inet6_dump_fib, },
3319 };
3320
3321 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3322 {
3323         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3324
3325         switch (event) {
3326         case RTM_NEWADDR:
3327                 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3328                 if (ifp->idev->cnf.forwarding)
3329                         addrconf_join_anycast(ifp);
3330                 break;
3331         case RTM_DELADDR:
3332                 if (ifp->idev->cnf.forwarding)
3333                         addrconf_leave_anycast(ifp);
3334                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3335                 dst_hold(&ifp->rt->u.dst);
3336                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3337                         dst_free(&ifp->rt->u.dst);
3338                 break;
3339         }
3340 }
3341
3342 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3343 {
3344         read_lock_bh(&addrconf_lock);
3345         if (likely(ifp->idev->dead == 0))
3346                 __ipv6_ifa_notify(event, ifp);
3347         read_unlock_bh(&addrconf_lock);
3348 }
3349
3350 #ifdef CONFIG_SYSCTL
3351
3352 static
3353 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3354                            void __user *buffer, size_t *lenp, loff_t *ppos)
3355 {
3356         int *valp = ctl->data;
3357         int val = *valp;
3358         int ret;
3359
3360         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3361
3362         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3363                 if (valp != &ipv6_devconf.forwarding) {
3364                         if ((!*valp) ^ (!val)) {
3365                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3366                                 if (idev == NULL)
3367                                         return ret;
3368                                 dev_forward_change(idev);
3369                         }
3370                 } else {
3371                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3372                         addrconf_forward_change();
3373                 }
3374                 if (*valp)
3375                         rt6_purge_dflt_routers();
3376         }
3377
3378         return ret;
3379 }
3380
3381 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3382                                             int __user *name, int nlen,
3383                                             void __user *oldval,
3384                                             size_t __user *oldlenp,
3385                                             void __user *newval, size_t newlen,
3386                                             void **context)
3387 {
3388         int *valp = table->data;
3389         int new;
3390
3391         if (!newval || !newlen)
3392                 return 0;
3393         if (newlen != sizeof(int))
3394                 return -EINVAL;
3395         if (get_user(new, (int __user *)newval))
3396                 return -EFAULT;
3397         if (new == *valp)
3398                 return 0;
3399         if (oldval && oldlenp) {
3400                 size_t len;
3401                 if (get_user(len, oldlenp))
3402                         return -EFAULT;
3403                 if (len) {
3404                         if (len > table->maxlen)
3405                                 len = table->maxlen;
3406                         if (copy_to_user(oldval, valp, len))
3407                                 return -EFAULT;
3408                         if (put_user(len, oldlenp))
3409                                 return -EFAULT;
3410                 }
3411         }
3412
3413         if (valp != &ipv6_devconf_dflt.forwarding) {
3414                 if (valp != &ipv6_devconf.forwarding) {
3415                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3416                         int changed;
3417                         if (unlikely(idev == NULL))
3418                                 return -ENODEV;
3419                         changed = (!*valp) ^ (!new);
3420                         *valp = new;
3421                         if (changed)
3422                                 dev_forward_change(idev);
3423                 } else {
3424                         *valp = new;
3425                         addrconf_forward_change();
3426                 }
3427
3428                 if (*valp)
3429                         rt6_purge_dflt_routers();
3430         } else
3431                 *valp = new;
3432
3433         return 1;
3434 }
3435
3436 static struct addrconf_sysctl_table
3437 {
3438         struct ctl_table_header *sysctl_header;
3439         ctl_table addrconf_vars[__NET_IPV6_MAX];
3440         ctl_table addrconf_dev[2];
3441         ctl_table addrconf_conf_dir[2];
3442         ctl_table addrconf_proto_dir[2];
3443         ctl_table addrconf_root_dir[2];
3444 } addrconf_sysctl = {
3445         .sysctl_header = NULL,
3446         .addrconf_vars = {
3447                 {
3448                         .ctl_name       =       NET_IPV6_FORWARDING,
3449                         .procname       =       "forwarding",
3450                         .data           =       &ipv6_devconf.forwarding,
3451                         .maxlen         =       sizeof(int),
3452                         .mode           =       0644,
3453                         .proc_handler   =       &addrconf_sysctl_forward,
3454                         .strategy       =       &addrconf_sysctl_forward_strategy,
3455                 },
3456                 {
3457                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3458                         .procname       =       "hop_limit",
3459                         .data           =       &ipv6_devconf.hop_limit,
3460                         .maxlen         =       sizeof(int),
3461                         .mode           =       0644,
3462                         .proc_handler   =       proc_dointvec,
3463                 },
3464                 {
3465                         .ctl_name       =       NET_IPV6_MTU,
3466                         .procname       =       "mtu",
3467                         .data           =       &ipv6_devconf.mtu6,
3468                         .maxlen         =       sizeof(int),
3469                         .mode           =       0644,
3470                         .proc_handler   =       &proc_dointvec,
3471                 },
3472                 {
3473                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3474                         .procname       =       "accept_ra",
3475                         .data           =       &ipv6_devconf.accept_ra,
3476                         .maxlen         =       sizeof(int),
3477                         .mode           =       0644,
3478                         .proc_handler   =       &proc_dointvec,
3479                 },
3480                 {
3481                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3482                         .procname       =       "accept_redirects",
3483                         .data           =       &ipv6_devconf.accept_redirects,
3484                         .maxlen         =       sizeof(int),
3485                         .mode           =       0644,
3486                         .proc_handler   =       &proc_dointvec,
3487                 },
3488                 {
3489                         .ctl_name       =       NET_IPV6_AUTOCONF,
3490                         .procname       =       "autoconf",
3491                         .data           =       &ipv6_devconf.autoconf,
3492                         .maxlen         =       sizeof(int),
3493                         .mode           =       0644,
3494                         .proc_handler   =       &proc_dointvec,
3495                 },
3496                 {
3497                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3498                         .procname       =       "dad_transmits",
3499                         .data           =       &ipv6_devconf.dad_transmits,
3500                         .maxlen         =       sizeof(int),
3501                         .mode           =       0644,
3502                         .proc_handler   =       &proc_dointvec,
3503                 },
3504                 {
3505                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3506                         .procname       =       "router_solicitations",
3507                         .data           =       &ipv6_devconf.rtr_solicits,
3508                         .maxlen         =       sizeof(int),
3509                         .mode           =       0644,
3510                         .proc_handler   =       &proc_dointvec,
3511                 },
3512                 {
3513                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3514                         .procname       =       "router_solicitation_interval",
3515                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3516                         .maxlen         =       sizeof(int),
3517                         .mode           =       0644,
3518                         .proc_handler   =       &proc_dointvec_jiffies,
3519                         .strategy       =       &sysctl_jiffies,
3520                 },
3521                 {
3522                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3523                         .procname       =       "router_solicitation_delay",
3524                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3525                         .maxlen         =       sizeof(int),
3526                         .mode           =       0644,
3527                         .proc_handler   =       &proc_dointvec_jiffies,
3528                         .strategy       =       &sysctl_jiffies,
3529                 },
3530                 {
3531                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3532                         .procname       =       "force_mld_version",
3533                         .data           =       &ipv6_devconf.force_mld_version,
3534                         .maxlen         =       sizeof(int),
3535                         .mode           =       0644,
3536                         .proc_handler   =       &proc_dointvec,
3537                 },
3538 #ifdef CONFIG_IPV6_PRIVACY
3539                 {
3540                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3541                         .procname       =       "use_tempaddr",
3542                         .data           =       &ipv6_devconf.use_tempaddr,
3543                         .maxlen         =       sizeof(int),
3544                         .mode           =       0644,
3545                         .proc_handler   =       &proc_dointvec,
3546                 },
3547                 {
3548                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3549                         .procname       =       "temp_valid_lft",
3550                         .data           =       &ipv6_devconf.temp_valid_lft,
3551                         .maxlen         =       sizeof(int),
3552                         .mode           =       0644,
3553                         .proc_handler   =       &proc_dointvec,
3554                 },
3555                 {
3556                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3557                         .procname       =       "temp_prefered_lft",
3558                         .data           =       &ipv6_devconf.temp_prefered_lft,
3559                         .maxlen         =       sizeof(int),
3560                         .mode           =       0644,
3561                         .proc_handler   =       &proc_dointvec,
3562                 },
3563                 {
3564                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3565                         .procname       =       "regen_max_retry",
3566                         .data           =       &ipv6_devconf.regen_max_retry,
3567                         .maxlen         =       sizeof(int),
3568                         .mode           =       0644,
3569                         .proc_handler   =       &proc_dointvec,
3570                 },
3571                 {
3572                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3573                         .procname       =       "max_desync_factor",
3574                         .data           =       &ipv6_devconf.max_desync_factor,
3575                         .maxlen         =       sizeof(int),
3576                         .mode           =       0644,
3577                         .proc_handler   =       &proc_dointvec,
3578                 },
3579 #endif
3580                 {
3581                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3582                         .procname       =       "max_addresses",
3583                         .data           =       &ipv6_devconf.max_addresses,
3584                         .maxlen         =       sizeof(int),
3585                         .mode           =       0644,
3586                         .proc_handler   =       &proc_dointvec,
3587                 },
3588                 {
3589                         .ctl_name       =       0,      /* sentinel */
3590                 }
3591         },
3592         .addrconf_dev = {
3593                 {
3594                         .ctl_name       =       NET_PROTO_CONF_ALL,
3595                         .procname       =       "all",
3596                         .mode           =       0555,
3597                         .child          =       addrconf_sysctl.addrconf_vars,
3598                 },
3599                 {
3600                         .ctl_name       =       0,      /* sentinel */
3601                 }
3602         },
3603         .addrconf_conf_dir = {
3604                 {
3605                         .ctl_name       =       NET_IPV6_CONF,
3606                         .procname       =       "conf",
3607                         .mode           =       0555,
3608                         .child          =       addrconf_sysctl.addrconf_dev,
3609                 },
3610                 {
3611                         .ctl_name       =       0,      /* sentinel */
3612                 }
3613         },
3614         .addrconf_proto_dir = {
3615                 {
3616                         .ctl_name       =       NET_IPV6,
3617                         .procname       =       "ipv6",
3618                         .mode           =       0555,
3619                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3620                 },
3621                 {
3622                         .ctl_name       =       0,      /* sentinel */
3623                 }
3624         },
3625         .addrconf_root_dir = {
3626                 {
3627                         .ctl_name       =       CTL_NET,
3628                         .procname       =       "net",
3629                         .mode           =       0555,
3630                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3631                 },
3632                 {
3633                         .ctl_name       =       0,      /* sentinel */
3634                 }
3635         },
3636 };
3637
3638 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3639 {
3640         int i;
3641         struct net_device *dev = idev ? idev->dev : NULL;
3642         struct addrconf_sysctl_table *t;
3643         char *dev_name = NULL;
3644
3645         t = kmalloc(sizeof(*t), GFP_KERNEL);
3646         if (t == NULL)
3647                 return;
3648         memcpy(t, &addrconf_sysctl, sizeof(*t));
3649         for (i=0; t->addrconf_vars[i].data; i++) {
3650                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3651                 t->addrconf_vars[i].de = NULL;
3652                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3653         }
3654         if (dev) {
3655                 dev_name = dev->name;
3656                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3657         } else {
3658                 dev_name = "default";
3659                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3660         }
3661
3662         /*
3663          * Make a copy of dev_name, because '.procname' is regarded as const
3664          * by sysctl and we wouldn't want anyone to change it under our feet
3665          * (see SIOCSIFNAME).
3666          */
3667         dev_name = kstrdup(dev_name, GFP_KERNEL);
3668         if (!dev_name)
3669             goto free;
3670
3671         t->addrconf_dev[0].procname = dev_name;
3672
3673         t->addrconf_dev[0].child = t->addrconf_vars;
3674         t->addrconf_dev[0].de = NULL;
3675         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3676         t->addrconf_conf_dir[0].de = NULL;
3677         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3678         t->addrconf_proto_dir[0].de = NULL;
3679         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3680         t->addrconf_root_dir[0].de = NULL;
3681
3682         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3683         if (t->sysctl_header == NULL)
3684                 goto free_procname;
3685         else
3686                 p->sysctl = t;
3687         return;
3688
3689         /* error path */
3690  free_procname:
3691         kfree(dev_name);
3692  free:
3693         kfree(t);
3694
3695         return;
3696 }
3697
3698 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3699 {
3700         if (p->sysctl) {
3701                 struct addrconf_sysctl_table *t = p->sysctl;
3702                 p->sysctl = NULL;
3703                 unregister_sysctl_table(t->sysctl_header);
3704                 kfree(t->addrconf_dev[0].procname);
3705                 kfree(t);
3706         }
3707 }
3708
3709
3710 #endif
3711
3712 /*
3713  *      Device notifier
3714  */
3715
3716 int register_inet6addr_notifier(struct notifier_block *nb)
3717 {
3718         return notifier_chain_register(&inet6addr_chain, nb);
3719 }
3720
3721 int unregister_inet6addr_notifier(struct notifier_block *nb)
3722 {
3723         return notifier_chain_unregister(&inet6addr_chain,nb);
3724 }
3725
3726 /*
3727  *      Init / cleanup code
3728  */
3729
3730 int __init addrconf_init(void)
3731 {
3732         int err = 0;
3733
3734         /* The addrconf netdev notifier requires that loopback_dev
3735          * has it's ipv6 private information allocated and setup
3736          * before it can bring up and give link-local addresses
3737          * to other devices which are up.
3738          *
3739          * Unfortunately, loopback_dev is not necessarily the first
3740          * entry in the global dev_base list of net devices.  In fact,
3741          * it is likely to be the very last entry on that list.
3742          * So this causes the notifier registry below to try and
3743          * give link-local addresses to all devices besides loopback_dev
3744          * first, then loopback_dev, which cases all the non-loopback_dev
3745          * devices to fail to get a link-local address.
3746          *
3747          * So, as a temporary fix, allocate the ipv6 structure for
3748          * loopback_dev first by hand.
3749          * Longer term, all of the dependencies ipv6 has upon the loopback
3750          * device and it being up should be removed.
3751          */
3752         rtnl_lock();
3753         if (!ipv6_add_dev(&loopback_dev))
3754                 err = -ENOMEM;
3755         rtnl_unlock();
3756         if (err)
3757                 return err;
3758
3759         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3760
3761         register_netdevice_notifier(&ipv6_dev_notf);
3762
3763 #ifdef CONFIG_IPV6_PRIVACY
3764         md5_tfm = crypto_alloc_tfm("md5", 0);
3765         if (unlikely(md5_tfm == NULL))
3766                 printk(KERN_WARNING
3767                         "failed to load transform for md5\n");
3768 #endif
3769
3770         addrconf_verify(0);
3771         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3772 #ifdef CONFIG_SYSCTL
3773         addrconf_sysctl.sysctl_header =
3774                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3775         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3776 #endif
3777
3778         return 0;
3779 }
3780
3781 void __exit addrconf_cleanup(void)
3782 {
3783         struct net_device *dev;
3784         struct inet6_dev *idev;
3785         struct inet6_ifaddr *ifa;
3786         int i;
3787
3788         unregister_netdevice_notifier(&ipv6_dev_notf);
3789
3790         rtnetlink_links[PF_INET6] = NULL;
3791 #ifdef CONFIG_SYSCTL
3792         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3793         addrconf_sysctl_unregister(&ipv6_devconf);
3794 #endif
3795
3796         rtnl_lock();
3797
3798         /*
3799          *      clean dev list.
3800          */
3801
3802         for (dev=dev_base; dev; dev=dev->next) {
3803                 if ((idev = __in6_dev_get(dev)) == NULL)
3804                         continue;
3805                 addrconf_ifdown(dev, 1);
3806         }
3807         addrconf_ifdown(&loopback_dev, 2);
3808
3809         /*
3810          *      Check hash table.
3811          */
3812
3813         write_lock_bh(&addrconf_hash_lock);
3814         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3815                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3816                         struct inet6_ifaddr *bifa;
3817
3818                         bifa = ifa;
3819                         ifa = ifa->lst_next;
3820                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3821                         /* Do not free it; something is wrong.
3822                            Now we can investigate it with debugger.
3823                          */
3824                 }
3825         }
3826         write_unlock_bh(&addrconf_hash_lock);
3827
3828         del_timer(&addr_chk_timer);
3829
3830         rtnl_unlock();
3831
3832 #ifdef CONFIG_IPV6_PRIVACY
3833         crypto_free_tfm(md5_tfm);
3834         md5_tfm = NULL;
3835 #endif
3836
3837 #ifdef CONFIG_PROC_FS
3838         proc_net_remove("if_inet6");
3839 #endif
3840 }