net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/config.h>
  44 #include <linux/errno.h>
  45 #include <linux/types.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/sched.h>
  49 #include <linux/net.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #ifdef CONFIG_SYSCTL
  59 #include <linux/sysctl.h>
  60 #endif
  61 #include <linux/capability.h>
  62 #include <linux/delay.h>
  63 #include <linux/notifier.h>
  64 #include <linux/string.h>
  65
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <linux/if_tunnel.h>
  77 #include <linux/rtnetlink.h>
  78
  79 #ifdef CONFIG_IPV6_PRIVACY
  80 #include <linux/random.h>
  81 #endif
  82
  83 #include <asm/uaccess.h>
  84
  85 #include <linux/proc_fs.h>
  86 #include <linux/seq_file.h>
  87
  88 /* Set to 3 to get tracing... */
  89 #define ACONF_DEBUG 2
  90
  91 #if ACONF_DEBUG >= 3
  92 #define ADBG(x) printk x
  93 #else
  94 #define ADBG(x)
  95 #endif
  96
  97 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  99
 100 #ifdef CONFIG_SYSCTL
 101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 103 #endif
 104
 105 #ifdef CONFIG_IPV6_PRIVACY
 106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 108 static void ipv6_regen_rndid(unsigned long data);
 109
 110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 111 #endif
 112
 113 static int ipv6_count_addresses(struct inet6_dev *idev);
 114
 115 /*
 116  *      Configured unicast address hash table
 117  */
 118 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 119 static DEFINE_RWLOCK(addrconf_hash_lock);
 120
 121 /* Protects inet6 devices */
 122 DEFINE_RWLOCK(addrconf_lock);
 123
 124 static void addrconf_verify(unsigned long);
 125
 126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 127 static DEFINE_SPINLOCK(addrconf_verify_lock);
 128
 129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 131
 132 static int addrconf_ifdown(struct net_device *dev, int how);
 133
 134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 135 static void addrconf_dad_timer(unsigned long data);
 136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 137 static void addrconf_dad_run(struct inet6_dev *idev);
 138 static void addrconf_rs_timer(unsigned long data);
 139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 141
 142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 143                                 struct prefix_info *pinfo);
 144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 145
 146 static struct notifier_block *inet6addr_chain;
 147
 148 struct ipv6_devconf ipv6_devconf = {
 149         .forwarding             = 0,
 150         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 151         .mtu6                   = IPV6_MIN_MTU,
 152         .accept_ra              = 1,
 153         .accept_redirects       = 1,
 154         .autoconf               = 1,
 155         .force_mld_version      = 0,
 156         .dad_transmits          = 1,
 157         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 158         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 159         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 160 #ifdef CONFIG_IPV6_PRIVACY
 161         .use_tempaddr           = 0,
 162         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 163         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 164         .regen_max_retry        = REGEN_MAX_RETRY,
 165         .max_desync_factor      = MAX_DESYNC_FACTOR,
 166 #endif
 167         .max_addresses          = IPV6_MAX_ADDRESSES,
 168         .accept_ra_defrtr       = 1,
 169         .accept_ra_pinfo        = 1,
 170 };
 171
 172 static struct ipv6_devconf ipv6_devconf_dflt = {
 173         .forwarding             = 0,
 174         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 175         .mtu6                   = IPV6_MIN_MTU,
 176         .accept_ra              = 1,
 177         .accept_redirects       = 1,
 178         .autoconf               = 1,
 179         .dad_transmits          = 1,
 180         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 181         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 182         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 183 #ifdef CONFIG_IPV6_PRIVACY
 184         .use_tempaddr           = 0,
 185         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 186         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 187         .regen_max_retry        = REGEN_MAX_RETRY,
 188         .max_desync_factor      = MAX_DESYNC_FACTOR,
 189 #endif
 190         .max_addresses          = IPV6_MAX_ADDRESSES,
 191         .accept_ra_defrtr       = 1,
 192         .accept_ra_pinfo        = 1,
 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                 init_timer(&ndev->regen_timer);
 375                 ndev->regen_timer.function = ipv6_regen_rndid;
 376                 ndev->regen_timer.data = (unsigned long) ndev;
 377                 if ((dev->flags&IFF_LOOPBACK) ||
 378                     dev->type == ARPHRD_TUNNEL ||
 379                     dev->type == ARPHRD_NONE ||
 380                     dev->type == ARPHRD_SIT) {
 381                         printk(KERN_INFO
 382                                "%s: Disabled Privacy Extensions\n",
 383                                dev->name);
 384                         ndev->cnf.use_tempaddr = -1;
 385                 } else {
 386                         in6_dev_hold(ndev);
 387                         ipv6_regen_rndid((unsigned long) ndev);
 388                 }
 389 #endif
 390
 391                 if (netif_carrier_ok(dev))
 392                         ndev->if_flags |= IF_READY;
 393
 394                 write_lock_bh(&addrconf_lock);
 395                 dev->ip6_ptr = ndev;
 396                 write_unlock_bh(&addrconf_lock);
 397
 398                 ipv6_mc_init_dev(ndev);
 399                 ndev->tstamp = jiffies;
 400 #ifdef CONFIG_SYSCTL
 401                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 402                                       NET_IPV6_NEIGH, "ipv6",
 403                                       &ndisc_ifinfo_sysctl_change,
 404                                       NULL);
 405                 addrconf_sysctl_register(ndev, &ndev->cnf);
 406 #endif
 407         }
 408         return ndev;
 409 }
 410
 411 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 412 {
 413         struct inet6_dev *idev;
 414
 415         ASSERT_RTNL();
 416
 417         if ((idev = __in6_dev_get(dev)) == NULL) {
 418                 if ((idev = ipv6_add_dev(dev)) == NULL)
 419                         return NULL;
 420         }
 421
 422         if (dev->flags&IFF_UP)
 423                 ipv6_mc_up(idev);
 424         return idev;
 425 }
 426
 427 #ifdef CONFIG_SYSCTL
 428 static void dev_forward_change(struct inet6_dev *idev)
 429 {
 430         struct net_device *dev;
 431         struct inet6_ifaddr *ifa;
 432         struct in6_addr addr;
 433
 434         if (!idev)
 435                 return;
 436         dev = idev->dev;
 437         if (dev && (dev->flags & IFF_MULTICAST)) {
 438                 ipv6_addr_all_routers(&addr);
 439
 440                 if (idev->cnf.forwarding)
 441                         ipv6_dev_mc_inc(dev, &addr);
 442                 else
 443                         ipv6_dev_mc_dec(dev, &addr);
 444         }
 445         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 446                 if (idev->cnf.forwarding)
 447                         addrconf_join_anycast(ifa);
 448                 else
 449                         addrconf_leave_anycast(ifa);
 450         }
 451 }
 452
 453
 454 static void addrconf_forward_change(void)
 455 {
 456         struct net_device *dev;
 457         struct inet6_dev *idev;
 458
 459         read_lock(&dev_base_lock);
 460         for (dev=dev_base; dev; dev=dev->next) {
 461                 read_lock(&addrconf_lock);
 462                 idev = __in6_dev_get(dev);
 463                 if (idev) {
 464                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 465                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 466                         if (changed)
 467                                 dev_forward_change(idev);
 468                 }
 469                 read_unlock(&addrconf_lock);
 470         }
 471         read_unlock(&dev_base_lock);
 472 }
 473 #endif
 474
 475 /* Nobody refers to this ifaddr, destroy it */
 476
 477 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 478 {
 479         BUG_TRAP(ifp->if_next==NULL);
 480         BUG_TRAP(ifp->lst_next==NULL);
 481 #ifdef NET_REFCNT_DEBUG
 482         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 483 #endif
 484
 485         in6_dev_put(ifp->idev);
 486
 487         if (del_timer(&ifp->timer))
 488                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 489
 490         if (!ifp->dead) {
 491                 printk("Freeing alive inet6 address %p\n", ifp);
 492                 return;
 493         }
 494         dst_release(&ifp->rt->u.dst);
 495
 496         kfree(ifp);
 497 }
 498
 499 /* On success it returns ifp with increased reference count */
 500
 501 static struct inet6_ifaddr *
 502 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 503               int scope, u32 flags)
 504 {
 505         struct inet6_ifaddr *ifa = NULL;
 506         struct rt6_info *rt;
 507         int hash;
 508         int err = 0;
 509
 510         read_lock_bh(&addrconf_lock);
 511         if (idev->dead) {
 512                 err = -ENODEV;                  /*XXX*/
 513                 goto out2;
 514         }
 515
 516         write_lock(&addrconf_hash_lock);
 517
 518         /* Ignore adding duplicate addresses on an interface */
 519         if (ipv6_chk_same_addr(addr, idev->dev)) {
 520                 ADBG(("ipv6_add_addr: already assigned\n"));
 521                 err = -EEXIST;
 522                 goto out;
 523         }
 524
 525         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 526
 527         if (ifa == NULL) {
 528                 ADBG(("ipv6_add_addr: malloc failed\n"));
 529                 err = -ENOBUFS;
 530                 goto out;
 531         }
 532
 533         rt = addrconf_dst_alloc(idev, addr, 0);
 534         if (IS_ERR(rt)) {
 535                 err = PTR_ERR(rt);
 536                 goto out;
 537         }
 538
 539         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 540         ipv6_addr_copy(&ifa->addr, addr);
 541
 542         spin_lock_init(&ifa->lock);
 543         init_timer(&ifa->timer);
 544         ifa->timer.data = (unsigned long) ifa;
 545         ifa->scope = scope;
 546         ifa->prefix_len = pfxlen;
 547         ifa->flags = flags | IFA_F_TENTATIVE;
 548         ifa->cstamp = ifa->tstamp = jiffies;
 549
 550         ifa->idev = idev;
 551         in6_dev_hold(idev);
 552         /* For caller */
 553         in6_ifa_hold(ifa);
 554
 555         /* Add to big hash table */
 556         hash = ipv6_addr_hash(addr);
 557
 558         ifa->lst_next = inet6_addr_lst[hash];
 559         inet6_addr_lst[hash] = ifa;
 560         in6_ifa_hold(ifa);
 561         write_unlock(&addrconf_hash_lock);
 562
 563         write_lock(&idev->lock);
 564         /* Add to inet6_dev unicast addr list. */
 565         ifa->if_next = idev->addr_list;
 566         idev->addr_list = ifa;
 567
 568 #ifdef CONFIG_IPV6_PRIVACY
 569         if (ifa->flags&IFA_F_TEMPORARY) {
 570                 ifa->tmp_next = idev->tempaddr_list;
 571                 idev->tempaddr_list = ifa;
 572                 in6_ifa_hold(ifa);
 573         }
 574 #endif
 575
 576         ifa->rt = rt;
 577
 578         in6_ifa_hold(ifa);
 579         write_unlock(&idev->lock);
 580 out2:
 581         read_unlock_bh(&addrconf_lock);
 582
 583         if (likely(err == 0))
 584                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 585         else {
 586                 kfree(ifa);
 587                 ifa = ERR_PTR(err);
 588         }
 589
 590         return ifa;
 591 out:
 592         write_unlock(&addrconf_hash_lock);
 593         goto out2;
 594 }
 595
 596 /* This function wants to get referenced ifp and releases it before return */
 597
 598 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 599 {
 600         struct inet6_ifaddr *ifa, **ifap;
 601         struct inet6_dev *idev = ifp->idev;
 602         int hash;
 603         int deleted = 0, onlink = 0;
 604         unsigned long expires = jiffies;
 605
 606         hash = ipv6_addr_hash(&ifp->addr);
 607
 608         ifp->dead = 1;
 609
 610         write_lock_bh(&addrconf_hash_lock);
 611         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 612              ifap = &ifa->lst_next) {
 613                 if (ifa == ifp) {
 614                         *ifap = ifa->lst_next;
 615                         __in6_ifa_put(ifp);
 616                         ifa->lst_next = NULL;
 617                         break;
 618                 }
 619         }
 620         write_unlock_bh(&addrconf_hash_lock);
 621
 622         write_lock_bh(&idev->lock);
 623 #ifdef CONFIG_IPV6_PRIVACY
 624         if (ifp->flags&IFA_F_TEMPORARY) {
 625                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 626                      ifap = &ifa->tmp_next) {
 627                         if (ifa == ifp) {
 628                                 *ifap = ifa->tmp_next;
 629                                 if (ifp->ifpub) {
 630                                         in6_ifa_put(ifp->ifpub);
 631                                         ifp->ifpub = NULL;
 632                                 }
 633                                 __in6_ifa_put(ifp);
 634                                 ifa->tmp_next = NULL;
 635                                 break;
 636                         }
 637                 }
 638         }
 639 #endif
 640
 641         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 642                 if (ifa == ifp) {
 643                         *ifap = ifa->if_next;
 644                         __in6_ifa_put(ifp);
 645                         ifa->if_next = NULL;
 646                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 647                                 break;
 648                         deleted = 1;
 649                         continue;
 650                 } else if (ifp->flags & IFA_F_PERMANENT) {
 651                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 652                                               ifp->prefix_len)) {
 653                                 if (ifa->flags & IFA_F_PERMANENT) {
 654                                         onlink = 1;
 655                                         if (deleted)
 656                                                 break;
 657                                 } else {
 658                                         unsigned long lifetime;
 659
 660                                         if (!onlink)
 661                                                 onlink = -1;
 662
 663                                         spin_lock(&ifa->lock);
 664                                         lifetime = min_t(unsigned long,
 665                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 666                                         if (time_before(expires,
 667                                                         ifa->tstamp + lifetime * HZ))
 668                                                 expires = ifa->tstamp + lifetime * HZ;
 669                                         spin_unlock(&ifa->lock);
 670                                 }
 671                         }
 672                 }
 673                 ifap = &ifa->if_next;
 674         }
 675         write_unlock_bh(&idev->lock);
 676
 677         ipv6_ifa_notify(RTM_DELADDR, ifp);
 678
 679         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 680
 681         addrconf_del_timer(ifp);
 682
 683         /*
 684          * Purge or update corresponding prefix
 685          *
 686          * 1) we don't purge prefix here if address was not permanent.
 687          *    prefix is managed by its own lifetime.
 688          * 2) if there're no addresses, delete prefix.
 689          * 3) if there're still other permanent address(es),
 690          *    corresponding prefix is still permanent.
 691          * 4) otherwise, update prefix lifetime to the
 692          *    longest valid lifetime among the corresponding
 693          *    addresses on the device.
 694          *    Note: subsequent RA will update lifetime.
 695          *
 696          * --yoshfuji
 697          */
 698         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 699                 struct in6_addr prefix;
 700                 struct rt6_info *rt;
 701
 702                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 703                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 704
 705                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 706                         if (onlink == 0) {
 707                                 ip6_del_rt(rt, NULL, NULL, NULL);
 708                                 rt = NULL;
 709                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 710                                 rt->rt6i_expires = expires;
 711                                 rt->rt6i_flags |= RTF_EXPIRES;
 712                         }
 713                 }
 714                 dst_release(&rt->u.dst);
 715         }
 716
 717         in6_ifa_put(ifp);
 718 }
 719
 720 #ifdef CONFIG_IPV6_PRIVACY
 721 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 722 {
 723         struct inet6_dev *idev = ifp->idev;
 724         struct in6_addr addr, *tmpaddr;
 725         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 726         int tmp_plen;
 727         int ret = 0;
 728         int max_addresses;
 729
 730         write_lock(&idev->lock);
 731         if (ift) {
 732                 spin_lock_bh(&ift->lock);
 733                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 734                 spin_unlock_bh(&ift->lock);
 735                 tmpaddr = &addr;
 736         } else {
 737                 tmpaddr = NULL;
 738         }
 739 retry:
 740         in6_dev_hold(idev);
 741         if (idev->cnf.use_tempaddr <= 0) {
 742                 write_unlock(&idev->lock);
 743                 printk(KERN_INFO
 744                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 745                 in6_dev_put(idev);
 746                 ret = -1;
 747                 goto out;
 748         }
 749         spin_lock_bh(&ifp->lock);
 750         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 751                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 752                 spin_unlock_bh(&ifp->lock);
 753                 write_unlock(&idev->lock);
 754                 printk(KERN_WARNING
 755                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 756                 in6_dev_put(idev);
 757                 ret = -1;
 758                 goto out;
 759         }
 760         in6_ifa_hold(ifp);
 761         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 762         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 763                 spin_unlock_bh(&ifp->lock);
 764                 write_unlock(&idev->lock);
 765                 printk(KERN_WARNING
 766                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 767                 in6_ifa_put(ifp);
 768                 in6_dev_put(idev);
 769                 ret = -1;
 770                 goto out;
 771         }
 772         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 773         tmp_valid_lft = min_t(__u32,
 774                               ifp->valid_lft,
 775                               idev->cnf.temp_valid_lft);
 776         tmp_prefered_lft = min_t(__u32,
 777                                  ifp->prefered_lft,
 778                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 779         tmp_plen = ifp->prefix_len;
 780         max_addresses = idev->cnf.max_addresses;
 781         tmp_cstamp = ifp->cstamp;
 782         tmp_tstamp = ifp->tstamp;
 783         spin_unlock_bh(&ifp->lock);
 784
 785         write_unlock(&idev->lock);
 786         ift = !max_addresses ||
 787               ipv6_count_addresses(idev) < max_addresses ?
 788                 ipv6_add_addr(idev, &addr, tmp_plen,
 789                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 790         if (!ift || IS_ERR(ift)) {
 791                 in6_ifa_put(ifp);
 792                 in6_dev_put(idev);
 793                 printk(KERN_INFO
 794                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 795                 tmpaddr = &addr;
 796                 write_lock(&idev->lock);
 797                 goto retry;
 798         }
 799
 800         spin_lock_bh(&ift->lock);
 801         ift->ifpub = ifp;
 802         ift->valid_lft = tmp_valid_lft;
 803         ift->prefered_lft = tmp_prefered_lft;
 804         ift->cstamp = tmp_cstamp;
 805         ift->tstamp = tmp_tstamp;
 806         spin_unlock_bh(&ift->lock);
 807
 808         addrconf_dad_start(ift, 0);
 809         in6_ifa_put(ift);
 810         in6_dev_put(idev);
 811 out:
 812         return ret;
 813 }
 814 #endif
 815
 816 /*
 817  *      Choose an appropriate source address (RFC3484)
 818  */
 819 struct ipv6_saddr_score {
 820         int             addr_type;
 821         unsigned int    attrs;
 822         int             matchlen;
 823         int             scope;
 824         unsigned int    rule;
 825 };
 826
 827 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 828 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 829 #define IPV6_SADDR_SCORE_HOA            0x0008
 830 #define IPV6_SADDR_SCORE_OIF            0x0010
 831 #define IPV6_SADDR_SCORE_LABEL          0x0020
 832 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 833
 834 static int inline ipv6_saddr_preferred(int type)
 835 {
 836         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 837                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 838                 return 1;
 839         return 0;
 840 }
 841
 842 /* static matching label */
 843 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 844 {
 845  /*
 846   *     prefix (longest match)  label
 847   *     -----------------------------
 848   *     ::1/128                 0
 849   *     ::/0                    1
 850   *     2002::/16               2
 851   *     ::/96                   3
 852   *     ::ffff:0:0/96           4
 853   */
 854         if (type & IPV6_ADDR_LOOPBACK)
 855                 return 0;
 856         else if (type & IPV6_ADDR_COMPATv4)
 857                 return 3;
 858         else if (type & IPV6_ADDR_MAPPED)
 859                 return 4;
 860         else if (addr->s6_addr16[0] == htons(0x2002))
 861                 return 2;
 862         return 1;
 863 }
 864
 865 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 866                        struct in6_addr *daddr, struct in6_addr *saddr)
 867 {
 868         struct ipv6_saddr_score hiscore;
 869         struct inet6_ifaddr *ifa_result = NULL;
 870         int daddr_type = __ipv6_addr_type(daddr);
 871         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 872         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 873         struct net_device *dev;
 874
 875         memset(&hiscore, 0, sizeof(hiscore));
 876
 877         read_lock(&dev_base_lock);
 878         read_lock(&addrconf_lock);
 879
 880         for (dev = dev_base; dev; dev=dev->next) {
 881                 struct inet6_dev *idev;
 882                 struct inet6_ifaddr *ifa;
 883
 884                 /* Rule 0: Candidate Source Address (section 4)
 885                  *  - multicast and link-local destination address,
 886                  *    the set of candidate source address MUST only
 887                  *    include addresses assigned to interfaces
 888                  *    belonging to the same link as the outgoing
 889                  *    interface.
 890                  * (- For site-local destination addresses, the
 891                  *    set of candidate source addresses MUST only
 892                  *    include addresses assigned to interfaces
 893                  *    belonging to the same site as the outgoing
 894                  *    interface.)
 895                  */
 896                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 897                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 898                     daddr_dev && dev != daddr_dev)
 899                         continue;
 900
 901                 idev = __in6_dev_get(dev);
 902                 if (!idev)
 903                         continue;
 904
 905                 read_lock_bh(&idev->lock);
 906                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 907                         struct ipv6_saddr_score score;
 908
 909                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 910
 911                         /* Rule 0:
 912                          * - Tentative Address (RFC2462 section 5.4)
 913                          *  - A tentative address is not considered
 914                          *    "assigned to an interface" in the traditional
 915                          *    sense.
 916                          * - Candidate Source Address (section 4)
 917                          *  - In any case, anycast addresses, multicast
 918                          *    addresses, and the unspecified address MUST
 919                          *    NOT be included in a candidate set.
 920                          */
 921                         if (ifa->flags & IFA_F_TENTATIVE)
 922                                 continue;
 923                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 924                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 925                                 LIMIT_NETDEBUG(KERN_DEBUG
 926                                                "ADDRCONF: unspecified / multicast address"
 927                                                "assigned as unicast address on %s",
 928                                                dev->name);
 929                                 continue;
 930                         }
 931
 932                         score.attrs = 0;
 933                         score.matchlen = 0;
 934                         score.scope = 0;
 935                         score.rule = 0;
 936
 937                         if (ifa_result == NULL) {
 938                                 /* record it if the first available entry */
 939                                 goto record_it;
 940                         }
 941
 942                         /* Rule 1: Prefer same address */
 943                         if (hiscore.rule < 1) {
 944                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 945                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 946                                 hiscore.rule++;
 947                         }
 948                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 949                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 950                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 951                                         score.rule = 1;
 952                                         goto record_it;
 953                                 }
 954                         } else {
 955                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 956                                         continue;
 957                         }
 958
 959                         /* Rule 2: Prefer appropriate scope */
 960                         if (hiscore.rule < 2) {
 961                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 962                                 hiscore.rule++;
 963                         }
 964                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 965                         if (hiscore.scope < score.scope) {
 966                                 if (hiscore.scope < daddr_scope) {
 967                                         score.rule = 2;
 968                                         goto record_it;
 969                                 } else
 970                                         continue;
 971                         } else if (score.scope < hiscore.scope) {
 972                                 if (score.scope < daddr_scope)
 973                                         continue;
 974                                 else {
 975                                         score.rule = 2;
 976                                         goto record_it;
 977                                 }
 978                         }
 979
 980                         /* Rule 3: Avoid deprecated address */
 981                         if (hiscore.rule < 3) {
 982                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 983                                     !(ifa_result->flags & IFA_F_DEPRECATED))
 984                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 985                                 hiscore.rule++;
 986                         }
 987                         if (ipv6_saddr_preferred(score.addr_type) ||
 988                             !(ifa->flags & IFA_F_DEPRECATED)) {
 989                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 990                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
 991                                         score.rule = 3;
 992                                         goto record_it;
 993                                 }
 994                         } else {
 995                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
 996                                         continue;
 997                         }
 998
 999                         /* Rule 4: Prefer home address -- not implemented yet */
1000                         if (hiscore.rule < 4)
1001                                 hiscore.rule++;
1002
1003                         /* Rule 5: Prefer outgoing interface */
1004                         if (hiscore.rule < 5) {
1005                                 if (daddr_dev == NULL ||
1006                                     daddr_dev == ifa_result->idev->dev)
1007                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1008                                 hiscore.rule++;
1009                         }
1010                         if (daddr_dev == NULL ||
1011                             daddr_dev == ifa->idev->dev) {
1012                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1013                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1014                                         score.rule = 5;
1015                                         goto record_it;
1016                                 }
1017                         } else {
1018                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1019                                         continue;
1020                         }
1021
1022                         /* Rule 6: Prefer matching label */
1023                         if (hiscore.rule < 6) {
1024                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1025                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1026                                 hiscore.rule++;
1027                         }
1028                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1029                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1030                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1031                                         score.rule = 6;
1032                                         goto record_it;
1033                                 }
1034                         } else {
1035                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1036                                         continue;
1037                         }
1038
1039 #ifdef CONFIG_IPV6_PRIVACY
1040                         /* Rule 7: Prefer public address
1041                          * Note: prefer temprary address if use_tempaddr >= 2
1042                          */
1043                         if (hiscore.rule < 7) {
1044                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1045                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1046                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1047                                 hiscore.rule++;
1048                         }
1049                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1050                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1051                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1052                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1053                                         score.rule = 7;
1054                                         goto record_it;
1055                                 }
1056                         } else {
1057                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1058                                         continue;
1059                         }
1060 #endif
1061                         /* Rule 8: Use longest matching prefix */
1062                         if (hiscore.rule < 8) {
1063                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1064                                 hiscore.rule++;
1065                         }
1066                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1067                         if (score.matchlen > hiscore.matchlen) {
1068                                 score.rule = 8;
1069                                 goto record_it;
1070                         }
1071 #if 0
1072                         else if (score.matchlen < hiscore.matchlen)
1073                                 continue;
1074 #endif
1075
1076                         /* Final Rule: choose first available one */
1077                         continue;
1078 record_it:
1079                         if (ifa_result)
1080                                 in6_ifa_put(ifa_result);
1081                         in6_ifa_hold(ifa);
1082                         ifa_result = ifa;
1083                         hiscore = score;
1084                 }
1085                 read_unlock_bh(&idev->lock);
1086         }
1087         read_unlock(&addrconf_lock);
1088         read_unlock(&dev_base_lock);
1089
1090         if (!ifa_result)
1091                 return -EADDRNOTAVAIL;
1092
1093         ipv6_addr_copy(saddr, &ifa_result->addr);
1094         in6_ifa_put(ifa_result);
1095         return 0;
1096 }
1097
1098
1099 int ipv6_get_saddr(struct dst_entry *dst,
1100                    struct in6_addr *daddr, struct in6_addr *saddr)
1101 {
1102         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1103 }
1104
1105
1106 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1107 {
1108         struct inet6_dev *idev;
1109         int err = -EADDRNOTAVAIL;
1110
1111         read_lock(&addrconf_lock);
1112         if ((idev = __in6_dev_get(dev)) != NULL) {
1113                 struct inet6_ifaddr *ifp;
1114
1115                 read_lock_bh(&idev->lock);
1116                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1117                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1118                                 ipv6_addr_copy(addr, &ifp->addr);
1119                                 err = 0;
1120                                 break;
1121                         }
1122                 }
1123                 read_unlock_bh(&idev->lock);
1124         }
1125         read_unlock(&addrconf_lock);
1126         return err;
1127 }
1128
1129 static int ipv6_count_addresses(struct inet6_dev *idev)
1130 {
1131         int cnt = 0;
1132         struct inet6_ifaddr *ifp;
1133
1134         read_lock_bh(&idev->lock);
1135         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1136                 cnt++;
1137         read_unlock_bh(&idev->lock);
1138         return cnt;
1139 }
1140
1141 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1142 {
1143         struct inet6_ifaddr * ifp;
1144         u8 hash = ipv6_addr_hash(addr);
1145
1146         read_lock_bh(&addrconf_hash_lock);
1147         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1148                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1149                     !(ifp->flags&IFA_F_TENTATIVE)) {
1150                         if (dev == NULL || ifp->idev->dev == dev ||
1151                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1152                                 break;
1153                 }
1154         }
1155         read_unlock_bh(&addrconf_hash_lock);
1156         return ifp != NULL;
1157 }
1158
1159 static
1160 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1161 {
1162         struct inet6_ifaddr * ifp;
1163         u8 hash = ipv6_addr_hash(addr);
1164
1165         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1166                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1167                         if (dev == NULL || ifp->idev->dev == dev)
1168                                 break;
1169                 }
1170         }
1171         return ifp != NULL;
1172 }
1173
1174 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1175 {
1176         struct inet6_ifaddr * ifp;
1177         u8 hash = ipv6_addr_hash(addr);
1178
1179         read_lock_bh(&addrconf_hash_lock);
1180         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1181                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1182                         if (dev == NULL || ifp->idev->dev == dev ||
1183                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1184                                 in6_ifa_hold(ifp);
1185                                 break;
1186                         }
1187                 }
1188         }
1189         read_unlock_bh(&addrconf_hash_lock);
1190
1191         return ifp;
1192 }
1193
1194 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1195 {
1196         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1197         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1198         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1199         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1200         int sk_ipv6only = ipv6_only_sock(sk);
1201         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1202         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1203         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1204
1205         if (!sk2_rcv_saddr && !sk_ipv6only)
1206                 return 1;
1207
1208         if (addr_type2 == IPV6_ADDR_ANY &&
1209             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1210                 return 1;
1211
1212         if (addr_type == IPV6_ADDR_ANY &&
1213             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1214                 return 1;
1215
1216         if (sk2_rcv_saddr6 &&
1217             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1218                 return 1;
1219
1220         if (addr_type == IPV6_ADDR_MAPPED &&
1221             !sk2_ipv6only &&
1222             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1223                 return 1;
1224
1225         return 0;
1226 }
1227
1228 /* Gets referenced address, destroys ifaddr */
1229
1230 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1231 {
1232         if (ifp->flags&IFA_F_PERMANENT) {
1233                 spin_lock_bh(&ifp->lock);
1234                 addrconf_del_timer(ifp);
1235                 ifp->flags |= IFA_F_TENTATIVE;
1236                 spin_unlock_bh(&ifp->lock);
1237                 in6_ifa_put(ifp);
1238 #ifdef CONFIG_IPV6_PRIVACY
1239         } else if (ifp->flags&IFA_F_TEMPORARY) {
1240                 struct inet6_ifaddr *ifpub;
1241                 spin_lock_bh(&ifp->lock);
1242                 ifpub = ifp->ifpub;
1243                 if (ifpub) {
1244                         in6_ifa_hold(ifpub);
1245                         spin_unlock_bh(&ifp->lock);
1246                         ipv6_create_tempaddr(ifpub, ifp);
1247                         in6_ifa_put(ifpub);
1248                 } else {
1249                         spin_unlock_bh(&ifp->lock);
1250                 }
1251                 ipv6_del_addr(ifp);
1252 #endif
1253         } else
1254                 ipv6_del_addr(ifp);
1255 }
1256
1257 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1258 {
1259         if (net_ratelimit())
1260                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1261         addrconf_dad_stop(ifp);
1262 }
1263
1264 /* Join to solicited addr multicast group. */
1265
1266 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1267 {
1268         struct in6_addr maddr;
1269
1270         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1271                 return;
1272
1273         addrconf_addr_solict_mult(addr, &maddr);
1274         ipv6_dev_mc_inc(dev, &maddr);
1275 }
1276
1277 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1278 {
1279         struct in6_addr maddr;
1280
1281         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1282                 return;
1283
1284         addrconf_addr_solict_mult(addr, &maddr);
1285         __ipv6_dev_mc_dec(idev, &maddr);
1286 }
1287
1288 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1289 {
1290         struct in6_addr addr;
1291         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1292         if (ipv6_addr_any(&addr))
1293                 return;
1294         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1295 }
1296
1297 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1298 {
1299         struct in6_addr addr;
1300         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1301         if (ipv6_addr_any(&addr))
1302                 return;
1303         __ipv6_dev_ac_dec(ifp->idev, &addr);
1304 }
1305
1306 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1307 {
1308         if (dev->addr_len != ETH_ALEN)
1309                 return -1;
1310         memcpy(eui, dev->dev_addr, 3);
1311         memcpy(eui + 5, dev->dev_addr + 3, 3);
1312
1313         /*
1314          * The zSeries OSA network cards can be shared among various
1315          * OS instances, but the OSA cards have only one MAC address.
1316          * This leads to duplicate address conflicts in conjunction
1317          * with IPv6 if more than one instance uses the same card.
1318          *
1319          * The driver for these cards can deliver a unique 16-bit
1320          * identifier for each instance sharing the same card.  It is
1321          * placed instead of 0xFFFE in the interface identifier.  The
1322          * "u" bit of the interface identifier is not inverted in this
1323          * case.  Hence the resulting interface identifier has local
1324          * scope according to RFC2373.
1325          */
1326         if (dev->dev_id) {
1327                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1328                 eui[4] = dev->dev_id & 0xFF;
1329         } else {
1330                 eui[3] = 0xFF;
1331                 eui[4] = 0xFE;
1332                 eui[0] ^= 2;
1333         }
1334         return 0;
1335 }
1336
1337 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1338 {
1339         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1340         if (dev->addr_len != ARCNET_ALEN)
1341                 return -1;
1342         memset(eui, 0, 7);
1343         eui[7] = *(u8*)dev->dev_addr;
1344         return 0;
1345 }
1346
1347 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1348 {
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
1356 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1357 {
1358         switch (dev->type) {
1359         case ARPHRD_ETHER:
1360         case ARPHRD_FDDI:
1361         case ARPHRD_IEEE802_TR:
1362                 return addrconf_ifid_eui48(eui, dev);
1363         case ARPHRD_ARCNET:
1364                 return addrconf_ifid_arcnet(eui, dev);
1365         case ARPHRD_INFINIBAND:
1366                 return addrconf_ifid_infiniband(eui, dev);
1367         }
1368         return -1;
1369 }
1370
1371 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1372 {
1373         int err = -1;
1374         struct inet6_ifaddr *ifp;
1375
1376         read_lock_bh(&idev->lock);
1377         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1378                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1379                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1380                         err = 0;
1381                         break;
1382                 }
1383         }
1384         read_unlock_bh(&idev->lock);
1385         return err;
1386 }
1387
1388 #ifdef CONFIG_IPV6_PRIVACY
1389 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1390 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1391 {
1392 regen:
1393         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1394         idev->rndid[0] &= ~0x02;
1395
1396         /*
1397          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1398          * check if generated address is not inappropriate
1399          *
1400          *  - Reserved subnet anycast (RFC 2526)
1401          *      11111101 11....11 1xxxxxxx
1402          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1403          *      00-00-5E-FE-xx-xx-xx-xx
1404          *  - value 0
1405          *  - XXX: already assigned to an address on the device
1406          */
1407         if (idev->rndid[0] == 0xfd &&
1408             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1409             (idev->rndid[7]&0x80))
1410                 goto regen;
1411         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1412                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1413                         goto regen;
1414                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1415                         goto regen;
1416         }
1417
1418         return 0;
1419 }
1420
1421 static void ipv6_regen_rndid(unsigned long data)
1422 {
1423         struct inet6_dev *idev = (struct inet6_dev *) data;
1424         unsigned long expires;
1425
1426         read_lock_bh(&addrconf_lock);
1427         write_lock_bh(&idev->lock);
1428
1429         if (idev->dead)
1430                 goto out;
1431
1432         if (__ipv6_regen_rndid(idev) < 0)
1433                 goto out;
1434
1435         expires = jiffies +
1436                 idev->cnf.temp_prefered_lft * HZ -
1437                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1438         if (time_before(expires, jiffies)) {
1439                 printk(KERN_WARNING
1440                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1441                         idev->dev->name);
1442                 goto out;
1443         }
1444
1445         if (!mod_timer(&idev->regen_timer, expires))
1446                 in6_dev_hold(idev);
1447
1448 out:
1449         write_unlock_bh(&idev->lock);
1450         read_unlock_bh(&addrconf_lock);
1451         in6_dev_put(idev);
1452 }
1453
1454 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1455         int ret = 0;
1456
1457         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1458                 ret = __ipv6_regen_rndid(idev);
1459         return ret;
1460 }
1461 #endif
1462
1463 /*
1464  *      Add prefix route.
1465  */
1466
1467 static void
1468 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1469                       unsigned long expires, u32 flags)
1470 {
1471         struct in6_rtmsg rtmsg;
1472
1473         memset(&rtmsg, 0, sizeof(rtmsg));
1474         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1475         rtmsg.rtmsg_dst_len = plen;
1476         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1477         rtmsg.rtmsg_ifindex = dev->ifindex;
1478         rtmsg.rtmsg_info = expires;
1479         rtmsg.rtmsg_flags = RTF_UP|flags;
1480         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1481
1482         /* Prevent useless cloning on PtP SIT.
1483            This thing is done here expecting that the whole
1484            class of non-broadcast devices need not cloning.
1485          */
1486         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1487                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1488
1489         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1490 }
1491
1492 /* Create "default" multicast route to the interface */
1493
1494 static void addrconf_add_mroute(struct net_device *dev)
1495 {
1496         struct in6_rtmsg rtmsg;
1497
1498         memset(&rtmsg, 0, sizeof(rtmsg));
1499         ipv6_addr_set(&rtmsg.rtmsg_dst,
1500                       htonl(0xFF000000), 0, 0, 0);
1501         rtmsg.rtmsg_dst_len = 8;
1502         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1503         rtmsg.rtmsg_ifindex = dev->ifindex;
1504         rtmsg.rtmsg_flags = RTF_UP;
1505         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1506         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1507 }
1508
1509 static void sit_route_add(struct net_device *dev)
1510 {
1511         struct in6_rtmsg rtmsg;
1512
1513         memset(&rtmsg, 0, sizeof(rtmsg));
1514
1515         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1516         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1517
1518         /* prefix length - 96 bits "::d.d.d.d" */
1519         rtmsg.rtmsg_dst_len     = 96;
1520         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1521         rtmsg.rtmsg_ifindex     = dev->ifindex;
1522
1523         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1524 }
1525
1526 static void addrconf_add_lroute(struct net_device *dev)
1527 {
1528         struct in6_addr addr;
1529
1530         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1531         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1532 }
1533
1534 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1535 {
1536         struct inet6_dev *idev;
1537
1538         ASSERT_RTNL();
1539
1540         if ((idev = ipv6_find_idev(dev)) == NULL)
1541                 return NULL;
1542
1543         /* Add default multicast route */
1544         addrconf_add_mroute(dev);
1545
1546         /* Add link local route */
1547         addrconf_add_lroute(dev);
1548         return idev;
1549 }
1550
1551 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1552 {
1553         struct prefix_info *pinfo;
1554         __u32 valid_lft;
1555         __u32 prefered_lft;
1556         int addr_type;
1557         unsigned long rt_expires;
1558         struct inet6_dev *in6_dev;
1559
1560         pinfo = (struct prefix_info *) opt;
1561
1562         if (len < sizeof(struct prefix_info)) {
1563                 ADBG(("addrconf: prefix option too short\n"));
1564                 return;
1565         }
1566
1567         /*
1568          *      Validation checks ([ADDRCONF], page 19)
1569          */
1570
1571         addr_type = ipv6_addr_type(&pinfo->prefix);
1572
1573         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1574                 return;
1575
1576         valid_lft = ntohl(pinfo->valid);
1577         prefered_lft = ntohl(pinfo->prefered);
1578
1579         if (prefered_lft > valid_lft) {
1580                 if (net_ratelimit())
1581                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1582                 return;
1583         }
1584
1585         in6_dev = in6_dev_get(dev);
1586
1587         if (in6_dev == NULL) {
1588                 if (net_ratelimit())
1589                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1590                 return;
1591         }
1592
1593         /*
1594          *      Two things going on here:
1595          *      1) Add routes for on-link prefixes
1596          *      2) Configure prefixes with the auto flag set
1597          */
1598
1599         /* Avoid arithmetic overflow. Really, we could
1600            save rt_expires in seconds, likely valid_lft,
1601            but it would require division in fib gc, that it
1602            not good.
1603          */
1604         if (valid_lft >= 0x7FFFFFFF/HZ)
1605                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1606         else
1607                 rt_expires = valid_lft * HZ;
1608
1609         /*
1610          * We convert this (in jiffies) to clock_t later.
1611          * Avoid arithmetic overflow there as well.
1612          * Overflow can happen only if HZ < USER_HZ.
1613          */
1614         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1615                 rt_expires = 0x7FFFFFFF / USER_HZ;
1616
1617         if (pinfo->onlink) {
1618                 struct rt6_info *rt;
1619                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1620
1621                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1622                         if (rt->rt6i_flags&RTF_EXPIRES) {
1623                                 if (valid_lft == 0) {
1624                                         ip6_del_rt(rt, NULL, NULL, NULL);
1625                                         rt = NULL;
1626                                 } else {
1627                                         rt->rt6i_expires = jiffies + rt_expires;
1628                                 }
1629                         }
1630                 } else if (valid_lft) {
1631                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1632                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1633                 }
1634                 if (rt)
1635                         dst_release(&rt->u.dst);
1636         }
1637
1638         /* Try to figure out our local address for this prefix */
1639
1640         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1641                 struct inet6_ifaddr * ifp;
1642                 struct in6_addr addr;
1643                 int create = 0, update_lft = 0;
1644
1645                 if (pinfo->prefix_len == 64) {
1646                         memcpy(&addr, &pinfo->prefix, 8);
1647                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1648                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1649                                 in6_dev_put(in6_dev);
1650                                 return;
1651                         }
1652                         goto ok;
1653                 }
1654                 if (net_ratelimit())
1655                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1656                                pinfo->prefix_len);
1657                 in6_dev_put(in6_dev);
1658                 return;
1659
1660 ok:
1661
1662                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1663
1664                 if (ifp == NULL && valid_lft) {
1665                         int max_addresses = in6_dev->cnf.max_addresses;
1666
1667                         /* Do not allow to create too much of autoconfigured
1668                          * addresses; this would be too easy way to crash kernel.
1669                          */
1670                         if (!max_addresses ||
1671                             ipv6_count_addresses(in6_dev) < max_addresses)
1672                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1673                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1674
1675                         if (!ifp || IS_ERR(ifp)) {
1676                                 in6_dev_put(in6_dev);
1677                                 return;
1678                         }
1679
1680                         update_lft = create = 1;
1681                         ifp->cstamp = jiffies;
1682                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1683                 }
1684
1685                 if (ifp) {
1686                         int flags;
1687                         unsigned long now;
1688 #ifdef CONFIG_IPV6_PRIVACY
1689                         struct inet6_ifaddr *ift;
1690 #endif
1691                         u32 stored_lft;
1692
1693                         /* update lifetime (RFC2462 5.5.3 e) */
1694                         spin_lock(&ifp->lock);
1695                         now = jiffies;
1696                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1697                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1698                         else
1699                                 stored_lft = 0;
1700                         if (!update_lft && stored_lft) {
1701                                 if (valid_lft > MIN_VALID_LIFETIME ||
1702                                     valid_lft > stored_lft)
1703                                         update_lft = 1;
1704                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1705                                         /* valid_lft <= stored_lft is always true */
1706                                         /* XXX: IPsec */
1707                                         update_lft = 0;
1708                                 } else {
1709                                         valid_lft = MIN_VALID_LIFETIME;
1710                                         if (valid_lft < prefered_lft)
1711                                                 prefered_lft = valid_lft;
1712                                         update_lft = 1;
1713                                 }
1714                         }
1715
1716                         if (update_lft) {
1717                                 ifp->valid_lft = valid_lft;
1718                                 ifp->prefered_lft = prefered_lft;
1719                                 ifp->tstamp = now;
1720                                 flags = ifp->flags;
1721                                 ifp->flags &= ~IFA_F_DEPRECATED;
1722                                 spin_unlock(&ifp->lock);
1723
1724                                 if (!(flags&IFA_F_TENTATIVE))
1725                                         ipv6_ifa_notify(0, ifp);
1726                         } else
1727                                 spin_unlock(&ifp->lock);
1728
1729 #ifdef CONFIG_IPV6_PRIVACY
1730                         read_lock_bh(&in6_dev->lock);
1731                         /* update all temporary addresses in the list */
1732                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1733                                 /*
1734                                  * When adjusting the lifetimes of an existing
1735                                  * temporary address, only lower the lifetimes.
1736                                  * Implementations must not increase the
1737                                  * lifetimes of an existing temporary address
1738                                  * when processing a Prefix Information Option.
1739                                  */
1740                                 spin_lock(&ift->lock);
1741                                 flags = ift->flags;
1742                                 if (ift->valid_lft > valid_lft &&
1743                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1744                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1745                                 if (ift->prefered_lft > prefered_lft &&
1746                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1747                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1748                                 spin_unlock(&ift->lock);
1749                                 if (!(flags&IFA_F_TENTATIVE))
1750                                         ipv6_ifa_notify(0, ift);
1751                         }
1752
1753                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1754                                 /*
1755                                  * When a new public address is created as described in [ADDRCONF],
1756                                  * also create a new temporary address.
1757                                  */
1758                                 read_unlock_bh(&in6_dev->lock);
1759                                 ipv6_create_tempaddr(ifp, NULL);
1760                         } else {
1761                                 read_unlock_bh(&in6_dev->lock);
1762                         }
1763 #endif
1764                         in6_ifa_put(ifp);
1765                         addrconf_verify(0);
1766                 }
1767         }
1768         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1769         in6_dev_put(in6_dev);
1770 }
1771
1772 /*
1773  *      Set destination address.
1774  *      Special case for SIT interfaces where we create a new "virtual"
1775  *      device.
1776  */
1777 int addrconf_set_dstaddr(void __user *arg)
1778 {
1779         struct in6_ifreq ireq;
1780         struct net_device *dev;
1781         int err = -EINVAL;
1782
1783         rtnl_lock();
1784
1785         err = -EFAULT;
1786         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1787                 goto err_exit;
1788
1789         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1790
1791         err = -ENODEV;
1792         if (dev == NULL)
1793                 goto err_exit;
1794
1795         if (dev->type == ARPHRD_SIT) {
1796                 struct ifreq ifr;
1797                 mm_segment_t    oldfs;
1798                 struct ip_tunnel_parm p;
1799
1800                 err = -EADDRNOTAVAIL;
1801                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1802                         goto err_exit;
1803
1804                 memset(&p, 0, sizeof(p));
1805                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1806                 p.iph.saddr = 0;
1807                 p.iph.version = 4;
1808                 p.iph.ihl = 5;
1809                 p.iph.protocol = IPPROTO_IPV6;
1810                 p.iph.ttl = 64;
1811                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1812
1813                 oldfs = get_fs(); set_fs(KERNEL_DS);
1814                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1815                 set_fs(oldfs);
1816
1817                 if (err == 0) {
1818                         err = -ENOBUFS;
1819                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1820                                 goto err_exit;
1821                         err = dev_open(dev);
1822                 }
1823         }
1824
1825 err_exit:
1826         rtnl_unlock();
1827         return err;
1828 }
1829
1830 /*
1831  *      Manual configuration of address on an interface
1832  */
1833 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1834 {
1835         struct inet6_ifaddr *ifp;
1836         struct inet6_dev *idev;
1837         struct net_device *dev;
1838         int scope;
1839
1840         ASSERT_RTNL();
1841
1842         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1843                 return -ENODEV;
1844
1845         if (!(dev->flags&IFF_UP))
1846                 return -ENETDOWN;
1847
1848         if ((idev = addrconf_add_dev(dev)) == NULL)
1849                 return -ENOBUFS;
1850
1851         scope = ipv6_addr_scope(pfx);
1852
1853         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1854         if (!IS_ERR(ifp)) {
1855                 addrconf_dad_start(ifp, 0);
1856                 in6_ifa_put(ifp);
1857                 return 0;
1858         }
1859
1860         return PTR_ERR(ifp);
1861 }
1862
1863 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1864 {
1865         struct inet6_ifaddr *ifp;
1866         struct inet6_dev *idev;
1867         struct net_device *dev;
1868
1869         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1870                 return -ENODEV;
1871
1872         if ((idev = __in6_dev_get(dev)) == NULL)
1873                 return -ENXIO;
1874
1875         read_lock_bh(&idev->lock);
1876         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1877                 if (ifp->prefix_len == plen &&
1878                     ipv6_addr_equal(pfx, &ifp->addr)) {
1879                         in6_ifa_hold(ifp);
1880                         read_unlock_bh(&idev->lock);
1881
1882                         ipv6_del_addr(ifp);
1883
1884                         /* If the last address is deleted administratively,
1885                            disable IPv6 on this interface.
1886                          */
1887                         if (idev->addr_list == NULL)
1888                                 addrconf_ifdown(idev->dev, 1);
1889                         return 0;
1890                 }
1891         }
1892         read_unlock_bh(&idev->lock);
1893         return -EADDRNOTAVAIL;
1894 }
1895
1896
1897 int addrconf_add_ifaddr(void __user *arg)
1898 {
1899         struct in6_ifreq ireq;
1900         int err;
1901
1902         if (!capable(CAP_NET_ADMIN))
1903                 return -EPERM;
1904
1905         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1906                 return -EFAULT;
1907
1908         rtnl_lock();
1909         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1910         rtnl_unlock();
1911         return err;
1912 }
1913
1914 int addrconf_del_ifaddr(void __user *arg)
1915 {
1916         struct in6_ifreq ireq;
1917         int err;
1918
1919         if (!capable(CAP_NET_ADMIN))
1920                 return -EPERM;
1921
1922         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1923                 return -EFAULT;
1924
1925         rtnl_lock();
1926         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1927         rtnl_unlock();
1928         return err;
1929 }
1930
1931 static void sit_add_v4_addrs(struct inet6_dev *idev)
1932 {
1933         struct inet6_ifaddr * ifp;
1934         struct in6_addr addr;
1935         struct net_device *dev;
1936         int scope;
1937
1938         ASSERT_RTNL();
1939
1940         memset(&addr, 0, sizeof(struct in6_addr));
1941         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1942
1943         if (idev->dev->flags&IFF_POINTOPOINT) {
1944                 addr.s6_addr32[0] = htonl(0xfe800000);
1945                 scope = IFA_LINK;
1946         } else {
1947                 scope = IPV6_ADDR_COMPATv4;
1948         }
1949
1950         if (addr.s6_addr32[3]) {
1951                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1952                 if (!IS_ERR(ifp)) {
1953                         spin_lock_bh(&ifp->lock);
1954                         ifp->flags &= ~IFA_F_TENTATIVE;
1955                         spin_unlock_bh(&ifp->lock);
1956                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1957                         in6_ifa_put(ifp);
1958                 }
1959                 return;
1960         }
1961
1962         for (dev = dev_base; dev != NULL; dev = dev->next) {
1963                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1964                 if (in_dev && (dev->flags & IFF_UP)) {
1965                         struct in_ifaddr * ifa;
1966
1967                         int flag = scope;
1968
1969                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1970                                 int plen;
1971
1972                                 addr.s6_addr32[3] = ifa->ifa_local;
1973
1974                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1975                                         continue;
1976                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1977                                         if (idev->dev->flags&IFF_POINTOPOINT)
1978                                                 continue;
1979                                         flag |= IFA_HOST;
1980                                 }
1981                                 if (idev->dev->flags&IFF_POINTOPOINT)
1982                                         plen = 64;
1983                                 else
1984                                         plen = 96;
1985
1986                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1987                                                     IFA_F_PERMANENT);
1988                                 if (!IS_ERR(ifp)) {
1989                                         spin_lock_bh(&ifp->lock);
1990                                         ifp->flags &= ~IFA_F_TENTATIVE;
1991                                         spin_unlock_bh(&ifp->lock);
1992                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1993                                         in6_ifa_put(ifp);
1994                                 }
1995                         }
1996                 }
1997         }
1998 }
1999
2000 static void init_loopback(struct net_device *dev)
2001 {
2002         struct inet6_dev  *idev;
2003         struct inet6_ifaddr * ifp;
2004
2005         /* ::1 */
2006
2007         ASSERT_RTNL();
2008
2009         if ((idev = ipv6_find_idev(dev)) == NULL) {
2010                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2011                 return;
2012         }
2013
2014         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2015         if (!IS_ERR(ifp)) {
2016                 spin_lock_bh(&ifp->lock);
2017                 ifp->flags &= ~IFA_F_TENTATIVE;
2018                 spin_unlock_bh(&ifp->lock);
2019                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2020                 in6_ifa_put(ifp);
2021         }
2022 }
2023
2024 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2025 {
2026         struct inet6_ifaddr * ifp;
2027
2028         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2029         if (!IS_ERR(ifp)) {
2030                 addrconf_dad_start(ifp, 0);
2031                 in6_ifa_put(ifp);
2032         }
2033 }
2034
2035 static void addrconf_dev_config(struct net_device *dev)
2036 {
2037         struct in6_addr addr;
2038         struct inet6_dev    * idev;
2039
2040         ASSERT_RTNL();
2041
2042         if ((dev->type != ARPHRD_ETHER) &&
2043             (dev->type != ARPHRD_FDDI) &&
2044             (dev->type != ARPHRD_IEEE802_TR) &&
2045             (dev->type != ARPHRD_ARCNET) &&
2046             (dev->type != ARPHRD_INFINIBAND)) {
2047                 /* Alas, we support only Ethernet autoconfiguration. */
2048                 return;
2049         }
2050
2051         idev = addrconf_add_dev(dev);
2052         if (idev == NULL)
2053                 return;
2054
2055         memset(&addr, 0, sizeof(struct in6_addr));
2056         addr.s6_addr32[0] = htonl(0xFE800000);
2057
2058         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2059                 addrconf_add_linklocal(idev, &addr);
2060 }
2061
2062 static void addrconf_sit_config(struct net_device *dev)
2063 {
2064         struct inet6_dev *idev;
2065
2066         ASSERT_RTNL();
2067
2068         /*
2069          * Configure the tunnel with one of our IPv4
2070          * addresses... we should configure all of
2071          * our v4 addrs in the tunnel
2072          */
2073
2074         if ((idev = ipv6_find_idev(dev)) == NULL) {
2075                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2076                 return;
2077         }
2078
2079         sit_add_v4_addrs(idev);
2080
2081         if (dev->flags&IFF_POINTOPOINT) {
2082                 addrconf_add_mroute(dev);
2083                 addrconf_add_lroute(dev);
2084         } else
2085                 sit_route_add(dev);
2086 }
2087
2088 static inline int
2089 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2090 {
2091         struct in6_addr lladdr;
2092
2093         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2094                 addrconf_add_linklocal(idev, &lladdr);
2095                 return 0;
2096         }
2097         return -1;
2098 }
2099
2100 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2101 {
2102         struct net_device *link_dev;
2103
2104         /* first try to inherit the link-local address from the link device */
2105         if (idev->dev->iflink &&
2106             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2107                 if (!ipv6_inherit_linklocal(idev, link_dev))
2108                         return;
2109         }
2110         /* then try to inherit it from any device */
2111         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2112                 if (!ipv6_inherit_linklocal(idev, link_dev))
2113                         return;
2114         }
2115         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2116 }
2117
2118 /*
2119  * Autoconfigure tunnel with a link-local address so routing protocols,
2120  * DHCPv6, MLD etc. can be run over the virtual link
2121  */
2122
2123 static void addrconf_ip6_tnl_config(struct net_device *dev)
2124 {
2125         struct inet6_dev *idev;
2126
2127         ASSERT_RTNL();
2128
2129         if ((idev = addrconf_add_dev(dev)) == NULL) {
2130                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2131                 return;
2132         }
2133         ip6_tnl_add_linklocal(idev);
2134 }
2135
2136 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2137                            void * data)
2138 {
2139         struct net_device *dev = (struct net_device *) data;
2140         struct inet6_dev *idev = __in6_dev_get(dev);
2141         int run_pending = 0;
2142
2143         switch(event) {
2144         case NETDEV_UP:
2145         case NETDEV_CHANGE:
2146                 if (event == NETDEV_UP) {
2147                         if (!netif_carrier_ok(dev)) {
2148                                 /* device is not ready yet. */
2149                                 printk(KERN_INFO
2150                                         "ADDRCONF(NETDEV_UP): %s: "
2151                                         "link is not ready\n",
2152                                         dev->name);
2153                                 break;
2154                         }
2155
2156                         if (idev)
2157                                 idev->if_flags |= IF_READY;
2158                 } else {
2159                         if (!netif_carrier_ok(dev)) {
2160                                 /* device is still not ready. */
2161                                 break;
2162                         }
2163
2164                         if (idev) {
2165                                 if (idev->if_flags & IF_READY) {
2166                                         /* device is already configured. */
2167                                         break;
2168                                 }
2169                                 idev->if_flags |= IF_READY;
2170                         }
2171
2172                         printk(KERN_INFO
2173                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2174                                         "link becomes ready\n",
2175                                         dev->name);
2176
2177                         run_pending = 1;
2178                 }
2179
2180                 switch(dev->type) {
2181                 case ARPHRD_SIT:
2182                         addrconf_sit_config(dev);
2183                         break;
2184                 case ARPHRD_TUNNEL6:
2185                         addrconf_ip6_tnl_config(dev);
2186                         break;
2187                 case ARPHRD_LOOPBACK:
2188                         init_loopback(dev);
2189                         break;
2190
2191                 default:
2192                         addrconf_dev_config(dev);
2193                         break;
2194                 };
2195                 if (idev) {
2196                         if (run_pending)
2197                                 addrconf_dad_run(idev);
2198
2199                         /* If the MTU changed during the interface down, when the
2200                            interface up, the changed MTU must be reflected in the
2201                            idev as well as routers.
2202                          */
2203                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2204                                 rt6_mtu_change(dev, dev->mtu);
2205                                 idev->cnf.mtu6 = dev->mtu;
2206                         }
2207                         idev->tstamp = jiffies;
2208                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2209                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2210                            stop IPv6 on this interface.
2211                          */
2212                         if (dev->mtu < IPV6_MIN_MTU)
2213                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2214                 }
2215                 break;
2216
2217         case NETDEV_CHANGEMTU:
2218                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2219                         rt6_mtu_change(dev, dev->mtu);
2220                         idev->cnf.mtu6 = dev->mtu;
2221                         break;
2222                 }
2223
2224                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2225
2226         case NETDEV_DOWN:
2227         case NETDEV_UNREGISTER:
2228                 /*
2229                  *      Remove all addresses from this interface.
2230                  */
2231                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2232                 break;
2233
2234         case NETDEV_CHANGENAME:
2235 #ifdef CONFIG_SYSCTL
2236                 if (idev) {
2237                         addrconf_sysctl_unregister(&idev->cnf);
2238                         neigh_sysctl_unregister(idev->nd_parms);
2239                         neigh_sysctl_register(dev, idev->nd_parms,
2240                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2241                                               &ndisc_ifinfo_sysctl_change,
2242                                               NULL);
2243                         addrconf_sysctl_register(idev, &idev->cnf);
2244                 }
2245 #endif
2246                 break;
2247         };
2248
2249         return NOTIFY_OK;
2250 }
2251
2252 /*
2253  *      addrconf module should be notified of a device going up
2254  */
2255 static struct notifier_block ipv6_dev_notf = {
2256         .notifier_call = addrconf_notify,
2257         .priority = 0
2258 };
2259
2260 static int addrconf_ifdown(struct net_device *dev, int how)
2261 {
2262         struct inet6_dev *idev;
2263         struct inet6_ifaddr *ifa, **bifa;
2264         int i;
2265
2266         ASSERT_RTNL();
2267
2268         if (dev == &loopback_dev && how == 1)
2269                 how = 0;
2270
2271         rt6_ifdown(dev);
2272         neigh_ifdown(&nd_tbl, dev);
2273
2274         idev = __in6_dev_get(dev);
2275         if (idev == NULL)
2276                 return -ENODEV;
2277
2278         /* Step 1: remove reference to ipv6 device from parent device.
2279                    Do not dev_put!
2280          */
2281         if (how == 1) {
2282                 write_lock_bh(&addrconf_lock);
2283                 dev->ip6_ptr = NULL;
2284                 idev->dead = 1;
2285                 write_unlock_bh(&addrconf_lock);
2286
2287                 /* Step 1.5: remove snmp6 entry */
2288                 snmp6_unregister_dev(idev);
2289
2290         }
2291
2292         /* Step 2: clear hash table */
2293         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2294                 bifa = &inet6_addr_lst[i];
2295
2296                 write_lock_bh(&addrconf_hash_lock);
2297                 while ((ifa = *bifa) != NULL) {
2298                         if (ifa->idev == idev) {
2299                                 *bifa = ifa->lst_next;
2300                                 ifa->lst_next = NULL;
2301                                 addrconf_del_timer(ifa);
2302                                 in6_ifa_put(ifa);
2303                                 continue;
2304                         }
2305                         bifa = &ifa->lst_next;
2306                 }
2307                 write_unlock_bh(&addrconf_hash_lock);
2308         }
2309
2310         write_lock_bh(&idev->lock);
2311
2312         /* Step 3: clear flags for stateless addrconf */
2313         if (how != 1)
2314                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2315
2316         /* Step 4: clear address list */
2317 #ifdef CONFIG_IPV6_PRIVACY
2318         if (how == 1 && del_timer(&idev->regen_timer))
2319                 in6_dev_put(idev);
2320
2321         /* clear tempaddr list */
2322         while ((ifa = idev->tempaddr_list) != NULL) {
2323                 idev->tempaddr_list = ifa->tmp_next;
2324                 ifa->tmp_next = NULL;
2325                 ifa->dead = 1;
2326                 write_unlock_bh(&idev->lock);
2327                 spin_lock_bh(&ifa->lock);
2328
2329                 if (ifa->ifpub) {
2330                         in6_ifa_put(ifa->ifpub);
2331                         ifa->ifpub = NULL;
2332                 }
2333                 spin_unlock_bh(&ifa->lock);
2334                 in6_ifa_put(ifa);
2335                 write_lock_bh(&idev->lock);
2336         }
2337 #endif
2338         while ((ifa = idev->addr_list) != NULL) {
2339                 idev->addr_list = ifa->if_next;
2340                 ifa->if_next = NULL;
2341                 ifa->dead = 1;
2342                 addrconf_del_timer(ifa);
2343                 write_unlock_bh(&idev->lock);
2344
2345                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2346                 in6_ifa_put(ifa);
2347
2348                 write_lock_bh(&idev->lock);
2349         }
2350         write_unlock_bh(&idev->lock);
2351
2352         /* Step 5: Discard multicast list */
2353
2354         if (how == 1)
2355                 ipv6_mc_destroy_dev(idev);
2356         else
2357                 ipv6_mc_down(idev);
2358
2359         /* Step 5: netlink notification of this interface */
2360         idev->tstamp = jiffies;
2361         inet6_ifinfo_notify(RTM_DELLINK, idev);
2362
2363         /* Shot the device (if unregistered) */
2364
2365         if (how == 1) {
2366 #ifdef CONFIG_SYSCTL
2367                 addrconf_sysctl_unregister(&idev->cnf);
2368                 neigh_sysctl_unregister(idev->nd_parms);
2369 #endif
2370                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2371                 neigh_ifdown(&nd_tbl, dev);
2372                 in6_dev_put(idev);
2373         }
2374         return 0;
2375 }
2376
2377 static void addrconf_rs_timer(unsigned long data)
2378 {
2379         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2380
2381         if (ifp->idev->cnf.forwarding)
2382                 goto out;
2383
2384         if (ifp->idev->if_flags & IF_RA_RCVD) {
2385                 /*
2386                  *      Announcement received after solicitation
2387                  *      was sent
2388                  */
2389                 goto out;
2390         }
2391
2392         spin_lock(&ifp->lock);
2393         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2394                 struct in6_addr all_routers;
2395
2396                 /* The wait after the last probe can be shorter */
2397                 addrconf_mod_timer(ifp, AC_RS,
2398                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2399                                    ifp->idev->cnf.rtr_solicit_delay :
2400                                    ifp->idev->cnf.rtr_solicit_interval);
2401                 spin_unlock(&ifp->lock);
2402
2403                 ipv6_addr_all_routers(&all_routers);
2404
2405                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2406         } else {
2407                 spin_unlock(&ifp->lock);
2408                 /*
2409                  * Note: we do not support deprecated "all on-link"
2410                  * assumption any longer.
2411                  */
2412                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2413                        ifp->idev->dev->name);
2414         }
2415
2416 out:
2417         in6_ifa_put(ifp);
2418 }
2419
2420 /*
2421  *      Duplicate Address Detection
2422  */
2423 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2424 {
2425         unsigned long rand_num;
2426         struct inet6_dev *idev = ifp->idev;
2427
2428         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2429         ifp->probes = idev->cnf.dad_transmits;
2430         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2431 }
2432
2433 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2434 {
2435         struct inet6_dev *idev = ifp->idev;
2436         struct net_device *dev = idev->dev;
2437
2438         addrconf_join_solict(dev, &ifp->addr);
2439
2440         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2441                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2442                                         flags);
2443
2444         net_srandom(ifp->addr.s6_addr32[3]);
2445
2446         read_lock_bh(&idev->lock);
2447         if (ifp->dead)
2448                 goto out;
2449         spin_lock_bh(&ifp->lock);
2450
2451         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2452             !(ifp->flags&IFA_F_TENTATIVE)) {
2453                 ifp->flags &= ~IFA_F_TENTATIVE;
2454                 spin_unlock_bh(&ifp->lock);
2455                 read_unlock_bh(&idev->lock);
2456
2457                 addrconf_dad_completed(ifp);
2458                 return;
2459         }
2460
2461         if (!(idev->if_flags & IF_READY)) {
2462                 spin_unlock_bh(&ifp->lock);
2463                 read_unlock_bh(&idev->lock);
2464                 /*
2465                  * If the defice is not ready:
2466                  * - keep it tentative if it is a permanent address.
2467                  * - otherwise, kill it.
2468                  */
2469                 in6_ifa_hold(ifp);
2470                 addrconf_dad_stop(ifp);
2471                 return;
2472         }
2473         addrconf_dad_kick(ifp);
2474         spin_unlock_bh(&ifp->lock);
2475 out:
2476         read_unlock_bh(&idev->lock);
2477 }
2478
2479 static void addrconf_dad_timer(unsigned long data)
2480 {
2481         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2482         struct inet6_dev *idev = ifp->idev;
2483         struct in6_addr unspec;
2484         struct in6_addr mcaddr;
2485
2486         read_lock_bh(&idev->lock);
2487         if (idev->dead) {
2488                 read_unlock_bh(&idev->lock);
2489                 goto out;
2490         }
2491         spin_lock_bh(&ifp->lock);
2492         if (ifp->probes == 0) {
2493                 /*
2494                  * DAD was successful
2495                  */
2496
2497                 ifp->flags &= ~IFA_F_TENTATIVE;
2498                 spin_unlock_bh(&ifp->lock);
2499                 read_unlock_bh(&idev->lock);
2500
2501                 addrconf_dad_completed(ifp);
2502
2503                 goto out;
2504         }
2505
2506         ifp->probes--;
2507         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2508         spin_unlock_bh(&ifp->lock);
2509         read_unlock_bh(&idev->lock);
2510
2511         /* send a neighbour solicitation for our addr */
2512         memset(&unspec, 0, sizeof(unspec));
2513         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2514         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2515 out:
2516         in6_ifa_put(ifp);
2517 }
2518
2519 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2520 {
2521         struct net_device *     dev = ifp->idev->dev;
2522
2523         /*
2524          *      Configure the address for reception. Now it is valid.
2525          */
2526
2527         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2528
2529         /* If added prefix is link local and forwarding is off,
2530            start sending router solicitations.
2531          */
2532
2533         if (ifp->idev->cnf.forwarding == 0 &&
2534             ifp->idev->cnf.rtr_solicits > 0 &&
2535             (dev->flags&IFF_LOOPBACK) == 0 &&
2536             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2537                 struct in6_addr all_routers;
2538
2539                 ipv6_addr_all_routers(&all_routers);
2540
2541                 /*
2542                  *      If a host as already performed a random delay
2543                  *      [...] as part of DAD [...] there is no need
2544                  *      to delay again before sending the first RS
2545                  */
2546                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2547
2548                 spin_lock_bh(&ifp->lock);
2549                 ifp->probes = 1;
2550                 ifp->idev->if_flags |= IF_RS_SENT;
2551                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2552                 spin_unlock_bh(&ifp->lock);
2553         }
2554 }
2555
2556 static void addrconf_dad_run(struct inet6_dev *idev) {
2557         struct inet6_ifaddr *ifp;
2558
2559         read_lock_bh(&idev->lock);
2560         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2561                 spin_lock_bh(&ifp->lock);
2562                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2563                         spin_unlock_bh(&ifp->lock);
2564                         continue;
2565                 }
2566                 spin_unlock_bh(&ifp->lock);
2567                 addrconf_dad_kick(ifp);
2568         }
2569         read_unlock_bh(&idev->lock);
2570 }
2571
2572 #ifdef CONFIG_PROC_FS
2573 struct if6_iter_state {
2574         int bucket;
2575 };
2576
2577 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2578 {
2579         struct inet6_ifaddr *ifa = NULL;
2580         struct if6_iter_state *state = seq->private;
2581
2582         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2583                 ifa = inet6_addr_lst[state->bucket];
2584                 if (ifa)
2585                         break;
2586         }
2587         return ifa;
2588 }
2589
2590 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2591 {
2592         struct if6_iter_state *state = seq->private;
2593
2594         ifa = ifa->lst_next;
2595 try_again:
2596         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2597                 ifa = inet6_addr_lst[state->bucket];
2598                 goto try_again;
2599         }
2600         return ifa;
2601 }
2602
2603 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2604 {
2605         struct inet6_ifaddr *ifa = if6_get_first(seq);
2606
2607         if (ifa)
2608                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2609                         --pos;
2610         return pos ? NULL : ifa;
2611 }
2612
2613 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2614 {
2615         read_lock_bh(&addrconf_hash_lock);
2616         return if6_get_idx(seq, *pos);
2617 }
2618
2619 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2620 {
2621         struct inet6_ifaddr *ifa;
2622
2623         ifa = if6_get_next(seq, v);
2624         ++*pos;
2625         return ifa;
2626 }
2627
2628 static void if6_seq_stop(struct seq_file *seq, void *v)
2629 {
2630         read_unlock_bh(&addrconf_hash_lock);
2631 }
2632
2633 static int if6_seq_show(struct seq_file *seq, void *v)
2634 {
2635         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2636         seq_printf(seq,
2637                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2638                    NIP6(ifp->addr),
2639                    ifp->idev->dev->ifindex,
2640                    ifp->prefix_len,
2641                    ifp->scope,
2642                    ifp->flags,
2643                    ifp->idev->dev->name);
2644         return 0;
2645 }
2646
2647 static struct seq_operations if6_seq_ops = {
2648         .start  = if6_seq_start,
2649         .next   = if6_seq_next,
2650         .show   = if6_seq_show,
2651         .stop   = if6_seq_stop,
2652 };
2653
2654 static int if6_seq_open(struct inode *inode, struct file *file)
2655 {
2656         struct seq_file *seq;
2657         int rc = -ENOMEM;
2658         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2659
2660         if (!s)
2661                 goto out;
2662         memset(s, 0, sizeof(*s));
2663
2664         rc = seq_open(file, &if6_seq_ops);
2665         if (rc)
2666                 goto out_kfree;
2667
2668         seq = file->private_data;
2669         seq->private = s;
2670 out:
2671         return rc;
2672 out_kfree:
2673         kfree(s);
2674         goto out;
2675 }
2676
2677 static struct file_operations if6_fops = {
2678         .owner          = THIS_MODULE,
2679         .open           = if6_seq_open,
2680         .read           = seq_read,
2681         .llseek         = seq_lseek,
2682         .release        = seq_release_private,
2683 };
2684
2685 int __init if6_proc_init(void)
2686 {
2687         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2688                 return -ENOMEM;
2689         return 0;
2690 }
2691
2692 void if6_proc_exit(void)
2693 {
2694         proc_net_remove("if_inet6");
2695 }
2696 #endif  /* CONFIG_PROC_FS */
2697
2698 /*
2699  *      Periodic address status verification
2700  */
2701
2702 static void addrconf_verify(unsigned long foo)
2703 {
2704         struct inet6_ifaddr *ifp;
2705         unsigned long now, next;
2706         int i;
2707
2708         spin_lock_bh(&addrconf_verify_lock);
2709         now = jiffies;
2710         next = now + ADDR_CHECK_FREQUENCY;
2711
2712         del_timer(&addr_chk_timer);
2713
2714         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2715
2716 restart:
2717                 read_lock(&addrconf_hash_lock);
2718                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2719                         unsigned long age;
2720 #ifdef CONFIG_IPV6_PRIVACY
2721                         unsigned long regen_advance;
2722 #endif
2723
2724                         if (ifp->flags & IFA_F_PERMANENT)
2725                                 continue;
2726
2727                         spin_lock(&ifp->lock);
2728                         age = (now - ifp->tstamp) / HZ;
2729
2730 #ifdef CONFIG_IPV6_PRIVACY
2731                         regen_advance = ifp->idev->cnf.regen_max_retry *
2732                                         ifp->idev->cnf.dad_transmits *
2733                                         ifp->idev->nd_parms->retrans_time / HZ;
2734 #endif
2735
2736                         if (age >= ifp->valid_lft) {
2737                                 spin_unlock(&ifp->lock);
2738                                 in6_ifa_hold(ifp);
2739                                 read_unlock(&addrconf_hash_lock);
2740                                 ipv6_del_addr(ifp);
2741                                 goto restart;
2742                         } else if (age >= ifp->prefered_lft) {
2743                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2744                                 int deprecate = 0;
2745
2746                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2747                                         deprecate = 1;
2748                                         ifp->flags |= IFA_F_DEPRECATED;
2749                                 }
2750
2751                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2752                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2753
2754                                 spin_unlock(&ifp->lock);
2755
2756                                 if (deprecate) {
2757                                         in6_ifa_hold(ifp);
2758                                         read_unlock(&addrconf_hash_lock);
2759
2760                                         ipv6_ifa_notify(0, ifp);
2761                                         in6_ifa_put(ifp);
2762                                         goto restart;
2763                                 }
2764 #ifdef CONFIG_IPV6_PRIVACY
2765                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2766                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2767                                 if (age >= ifp->prefered_lft - regen_advance) {
2768                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2769                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2770                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2771                                         if (!ifp->regen_count && ifpub) {
2772                                                 ifp->regen_count++;
2773                                                 in6_ifa_hold(ifp);
2774                                                 in6_ifa_hold(ifpub);
2775                                                 spin_unlock(&ifp->lock);
2776                                                 read_unlock(&addrconf_hash_lock);
2777                                                 spin_lock(&ifpub->lock);
2778                                                 ifpub->regen_count = 0;
2779                                                 spin_unlock(&ifpub->lock);
2780                                                 ipv6_create_tempaddr(ifpub, ifp);
2781                                                 in6_ifa_put(ifpub);
2782                                                 in6_ifa_put(ifp);
2783                                                 goto restart;
2784                                         }
2785                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2786                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2787                                 spin_unlock(&ifp->lock);
2788 #endif
2789                         } else {
2790                                 /* ifp->prefered_lft <= ifp->valid_lft */
2791                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2792                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2793                                 spin_unlock(&ifp->lock);
2794                         }
2795                 }
2796                 read_unlock(&addrconf_hash_lock);
2797         }
2798
2799         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2800         add_timer(&addr_chk_timer);
2801         spin_unlock_bh(&addrconf_verify_lock);
2802 }
2803
2804 static int
2805 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2806 {
2807         struct rtattr **rta = arg;
2808         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2809         struct in6_addr *pfx;
2810
2811         pfx = NULL;
2812         if (rta[IFA_ADDRESS-1]) {
2813                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2814                         return -EINVAL;
2815                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2816         }
2817         if (rta[IFA_LOCAL-1]) {
2818                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2819                         return -EINVAL;
2820                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2821         }
2822         if (pfx == NULL)
2823                 return -EINVAL;
2824
2825         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2826 }
2827
2828 static int
2829 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2830 {
2831         struct rtattr  **rta = arg;
2832         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2833         struct in6_addr *pfx;
2834
2835         pfx = NULL;
2836         if (rta[IFA_ADDRESS-1]) {
2837                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2838                         return -EINVAL;
2839                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2840         }
2841         if (rta[IFA_LOCAL-1]) {
2842                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2843                         return -EINVAL;
2844                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2845         }
2846         if (pfx == NULL)
2847                 return -EINVAL;
2848
2849         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2850 }
2851
2852 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2853                              u32 pid, u32 seq, int event, unsigned int flags)
2854 {
2855         struct ifaddrmsg *ifm;
2856         struct nlmsghdr  *nlh;
2857         struct ifa_cacheinfo ci;
2858         unsigned char    *b = skb->tail;
2859
2860         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2861         ifm = NLMSG_DATA(nlh);
2862         ifm->ifa_family = AF_INET6;
2863         ifm->ifa_prefixlen = ifa->prefix_len;
2864         ifm->ifa_flags = ifa->flags;
2865         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2866         if (ifa->scope&IFA_HOST)
2867                 ifm->ifa_scope = RT_SCOPE_HOST;
2868         else if (ifa->scope&IFA_LINK)
2869                 ifm->ifa_scope = RT_SCOPE_LINK;
2870         else if (ifa->scope&IFA_SITE)
2871                 ifm->ifa_scope = RT_SCOPE_SITE;
2872         ifm->ifa_index = ifa->idev->dev->ifindex;
2873         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2874         if (!(ifa->flags&IFA_F_PERMANENT)) {
2875                 ci.ifa_prefered = ifa->prefered_lft;
2876                 ci.ifa_valid = ifa->valid_lft;
2877                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2878                         long tval = (jiffies - ifa->tstamp)/HZ;
2879                         ci.ifa_prefered -= tval;
2880                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2881                                 ci.ifa_valid -= tval;
2882                 }
2883         } else {
2884                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2885                 ci.ifa_valid = INFINITY_LIFE_TIME;
2886         }
2887         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2888                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2889         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2890                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2891         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2892         nlh->nlmsg_len = skb->tail - b;
2893         return skb->len;
2894
2895 nlmsg_failure:
2896 rtattr_failure:
2897         skb_trim(skb, b - skb->data);
2898         return -1;
2899 }
2900
2901 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2902                                 u32 pid, u32 seq, int event, u16 flags)
2903 {
2904         struct ifaddrmsg *ifm;
2905         struct nlmsghdr  *nlh;
2906         struct ifa_cacheinfo ci;
2907         unsigned char    *b = skb->tail;
2908
2909         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2910         ifm = NLMSG_DATA(nlh);
2911         ifm->ifa_family = AF_INET6;
2912         ifm->ifa_prefixlen = 128;
2913         ifm->ifa_flags = IFA_F_PERMANENT;
2914         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2915         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2916                 ifm->ifa_scope = RT_SCOPE_SITE;
2917         ifm->ifa_index = ifmca->idev->dev->ifindex;
2918         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2919         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2920                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2921                     * 100 / HZ);
2922         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2923                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2924                     * 100 / HZ);
2925         ci.ifa_prefered = INFINITY_LIFE_TIME;
2926         ci.ifa_valid = INFINITY_LIFE_TIME;
2927         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2928         nlh->nlmsg_len = skb->tail - b;
2929         return skb->len;
2930
2931 nlmsg_failure:
2932 rtattr_failure:
2933         skb_trim(skb, b - skb->data);
2934         return -1;
2935 }
2936
2937 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2938                                 u32 pid, u32 seq, int event, unsigned int flags)
2939 {
2940         struct ifaddrmsg *ifm;
2941         struct nlmsghdr  *nlh;
2942         struct ifa_cacheinfo ci;
2943         unsigned char    *b = skb->tail;
2944
2945         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2946         ifm = NLMSG_DATA(nlh);
2947         ifm->ifa_family = AF_INET6;
2948         ifm->ifa_prefixlen = 128;
2949         ifm->ifa_flags = IFA_F_PERMANENT;
2950         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2951         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2952                 ifm->ifa_scope = RT_SCOPE_SITE;
2953         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2954         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2955         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2956                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2957                     * 100 / HZ);
2958         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2959                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2960                     * 100 / HZ);
2961         ci.ifa_prefered = INFINITY_LIFE_TIME;
2962         ci.ifa_valid = INFINITY_LIFE_TIME;
2963         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2964         nlh->nlmsg_len = skb->tail - b;
2965         return skb->len;
2966
2967 nlmsg_failure:
2968 rtattr_failure:
2969         skb_trim(skb, b - skb->data);
2970         return -1;
2971 }
2972
2973 enum addr_type_t
2974 {
2975         UNICAST_ADDR,
2976         MULTICAST_ADDR,
2977         ANYCAST_ADDR,
2978 };
2979
2980 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2981                            enum addr_type_t type)
2982 {
2983         int idx, ip_idx;
2984         int s_idx, s_ip_idx;
2985         int err = 1;
2986         struct net_device *dev;
2987         struct inet6_dev *idev = NULL;
2988         struct inet6_ifaddr *ifa;
2989         struct ifmcaddr6 *ifmca;
2990         struct ifacaddr6 *ifaca;
2991
2992         s_idx = cb->args[0];
2993         s_ip_idx = ip_idx = cb->args[1];
2994         read_lock(&dev_base_lock);
2995
2996         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2997                 if (idx < s_idx)
2998                         continue;
2999                 if (idx > s_idx)
3000                         s_ip_idx = 0;
3001                 ip_idx = 0;
3002                 if ((idev = in6_dev_get(dev)) == NULL)
3003                         continue;
3004                 read_lock_bh(&idev->lock);
3005                 switch (type) {
3006                 case UNICAST_ADDR:
3007                         /* unicast address incl. temp addr */
3008                         for (ifa = idev->addr_list; ifa;
3009                              ifa = ifa->if_next, ip_idx++) {
3010                                 if (ip_idx < s_ip_idx)
3011                                         continue;
3012                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3013                                     NETLINK_CB(cb->skb).pid,
3014                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3015                                     NLM_F_MULTI)) <= 0)
3016                                         goto done;
3017                         }
3018                         break;
3019                 case MULTICAST_ADDR:
3020                         /* multicast address */
3021                         for (ifmca = idev->mc_list; ifmca;
3022                              ifmca = ifmca->next, ip_idx++) {
3023                                 if (ip_idx < s_ip_idx)
3024                                         continue;
3025                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3026                                     NETLINK_CB(cb->skb).pid,
3027                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3028                                     NLM_F_MULTI)) <= 0)
3029                                         goto done;
3030                         }
3031                         break;
3032                 case ANYCAST_ADDR:
3033                         /* anycast address */
3034                         for (ifaca = idev->ac_list; ifaca;
3035                              ifaca = ifaca->aca_next, ip_idx++) {
3036                                 if (ip_idx < s_ip_idx)
3037                                         continue;
3038                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3039                                     NETLINK_CB(cb->skb).pid,
3040                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3041                                     NLM_F_MULTI)) <= 0)
3042                                         goto done;
3043                         }
3044                         break;
3045                 default:
3046                         break;
3047                 }
3048                 read_unlock_bh(&idev->lock);
3049                 in6_dev_put(idev);
3050         }
3051 done:
3052         if (err <= 0) {
3053                 read_unlock_bh(&idev->lock);
3054                 in6_dev_put(idev);
3055         }
3056         read_unlock(&dev_base_lock);
3057         cb->args[0] = idx;
3058         cb->args[1] = ip_idx;
3059         return skb->len;
3060 }
3061
3062 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3063 {
3064         enum addr_type_t type = UNICAST_ADDR;
3065         return inet6_dump_addr(skb, cb, type);
3066 }
3067
3068 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3069 {
3070         enum addr_type_t type = MULTICAST_ADDR;
3071         return inet6_dump_addr(skb, cb, type);
3072 }
3073
3074
3075 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3076 {
3077         enum addr_type_t type = ANYCAST_ADDR;
3078         return inet6_dump_addr(skb, cb, type);
3079 }
3080
3081 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3082 {
3083         struct sk_buff *skb;
3084         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3085
3086         skb = alloc_skb(size, GFP_ATOMIC);
3087         if (!skb) {
3088                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3089                 return;
3090         }
3091         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3092                 kfree_skb(skb);
3093                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3094                 return;
3095         }
3096         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3097         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3098 }
3099
3100 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3101                                 __s32 *array, int bytes)
3102 {
3103         memset(array, 0, bytes);
3104         array[DEVCONF_FORWARDING] = cnf->forwarding;
3105         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3106         array[DEVCONF_MTU6] = cnf->mtu6;
3107         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3108         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3109         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3110         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3111         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3112         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3113         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3114         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3115 #ifdef CONFIG_IPV6_PRIVACY
3116         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3117         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3118         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3119         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3120         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3121 #endif
3122         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3123         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3124         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3125 }
3126
3127 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3128                              u32 pid, u32 seq, int event, unsigned int flags)
3129 {
3130         struct net_device       *dev = idev->dev;
3131         __s32                   *array = NULL;
3132         struct ifinfomsg        *r;
3133         struct nlmsghdr         *nlh;
3134         unsigned char           *b = skb->tail;
3135         struct rtattr           *subattr;
3136         __u32                   mtu = dev->mtu;
3137         struct ifla_cacheinfo   ci;
3138
3139         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3140         r = NLMSG_DATA(nlh);
3141         r->ifi_family = AF_INET6;
3142         r->__ifi_pad = 0;
3143         r->ifi_type = dev->type;
3144         r->ifi_index = dev->ifindex;
3145         r->ifi_flags = dev_get_flags(dev);
3146         r->ifi_change = 0;
3147
3148         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3149
3150         if (dev->addr_len)
3151                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3152
3153         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3154         if (dev->ifindex != dev->iflink)
3155                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3156
3157         subattr = (struct rtattr*)skb->tail;
3158
3159         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3160
3161         /* return the device flags */
3162         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3163
3164         /* return interface cacheinfo */
3165         ci.max_reasm_len = IPV6_MAXPLEN;
3166         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3167                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3168         ci.reachable_time = idev->nd_parms->reachable_time;
3169         ci.retrans_time = idev->nd_parms->retrans_time;
3170         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3171
3172         /* return the device sysctl params */
3173         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3174                 goto rtattr_failure;
3175         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3176         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3177
3178         /* XXX - Statistics/MC not implemented */
3179         subattr->rta_len = skb->tail - (u8*)subattr;
3180
3181         nlh->nlmsg_len = skb->tail - b;
3182         kfree(array);
3183         return skb->len;
3184
3185 nlmsg_failure:
3186 rtattr_failure:
3187         kfree(array);
3188         skb_trim(skb, b - skb->data);
3189         return -1;
3190 }
3191
3192 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3193 {
3194         int idx, err;
3195         int s_idx = cb->args[0];
3196         struct net_device *dev;
3197         struct inet6_dev *idev;
3198
3199         read_lock(&dev_base_lock);
3200         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3201                 if (idx < s_idx)
3202                         continue;
3203                 if ((idev = in6_dev_get(dev)) == NULL)
3204                         continue;
3205                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3206                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3207                 in6_dev_put(idev);
3208                 if (err <= 0)
3209                         break;
3210         }
3211         read_unlock(&dev_base_lock);
3212         cb->args[0] = idx;
3213
3214         return skb->len;
3215 }
3216
3217 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3218 {
3219         struct sk_buff *skb;
3220         /* 128 bytes ?? */
3221         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3222
3223         skb = alloc_skb(size, GFP_ATOMIC);
3224         if (!skb) {
3225                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3226                 return;
3227         }
3228         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3229                 kfree_skb(skb);
3230                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3231                 return;
3232         }
3233         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3234         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3235 }
3236
3237 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3238                         struct prefix_info *pinfo, u32 pid, u32 seq,
3239                         int event, unsigned int flags)
3240 {
3241         struct prefixmsg        *pmsg;
3242         struct nlmsghdr         *nlh;
3243         unsigned char           *b = skb->tail;
3244         struct prefix_cacheinfo ci;
3245
3246         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3247         pmsg = NLMSG_DATA(nlh);
3248         pmsg->prefix_family = AF_INET6;
3249         pmsg->prefix_pad1 = 0;
3250         pmsg->prefix_pad2 = 0;
3251         pmsg->prefix_ifindex = idev->dev->ifindex;
3252         pmsg->prefix_len = pinfo->prefix_len;
3253         pmsg->prefix_type = pinfo->type;
3254         pmsg->prefix_pad3 = 0;
3255
3256         pmsg->prefix_flags = 0;
3257         if (pinfo->onlink)
3258                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3259         if (pinfo->autoconf)
3260                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3261
3262         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3263
3264         ci.preferred_time = ntohl(pinfo->prefered);
3265         ci.valid_time = ntohl(pinfo->valid);
3266         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3267
3268         nlh->nlmsg_len = skb->tail - b;
3269         return skb->len;
3270
3271 nlmsg_failure:
3272 rtattr_failure:
3273         skb_trim(skb, b - skb->data);
3274         return -1;
3275 }
3276
3277 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3278                          struct prefix_info *pinfo)
3279 {
3280         struct sk_buff *skb;
3281         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3282
3283         skb = alloc_skb(size, GFP_ATOMIC);
3284         if (!skb) {
3285                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3286                 return;
3287         }
3288         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3289                 kfree_skb(skb);
3290                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3291                 return;
3292         }
3293         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3294         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3295 }
3296
3297 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3298         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3299         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3300         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3301         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3302         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3303         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3304         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3305         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3306         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3307                                       .dumpit   = inet6_dump_fib, },
3308 };
3309
3310 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3311 {
3312         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3313
3314         switch (event) {
3315         case RTM_NEWADDR:
3316                 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3317                 if (ifp->idev->cnf.forwarding)
3318                         addrconf_join_anycast(ifp);
3319                 break;
3320         case RTM_DELADDR:
3321                 if (ifp->idev->cnf.forwarding)
3322                         addrconf_leave_anycast(ifp);
3323                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3324                 dst_hold(&ifp->rt->u.dst);
3325                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3326                         dst_free(&ifp->rt->u.dst);
3327                 break;
3328         }
3329 }
3330
3331 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3332 {
3333         read_lock_bh(&addrconf_lock);
3334         if (likely(ifp->idev->dead == 0))
3335                 __ipv6_ifa_notify(event, ifp);
3336         read_unlock_bh(&addrconf_lock);
3337 }
3338
3339 #ifdef CONFIG_SYSCTL
3340
3341 static
3342 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3343                            void __user *buffer, size_t *lenp, loff_t *ppos)
3344 {
3345         int *valp = ctl->data;
3346         int val = *valp;
3347         int ret;
3348
3349         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3350
3351         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3352                 if (valp != &ipv6_devconf.forwarding) {
3353                         if ((!*valp) ^ (!val)) {
3354                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3355                                 if (idev == NULL)
3356                                         return ret;
3357                                 dev_forward_change(idev);
3358                         }
3359                 } else {
3360                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3361                         addrconf_forward_change();
3362                 }
3363                 if (*valp)
3364                         rt6_purge_dflt_routers();
3365         }
3366
3367         return ret;
3368 }
3369
3370 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3371                                             int __user *name, int nlen,
3372                                             void __user *oldval,
3373                                             size_t __user *oldlenp,
3374                                             void __user *newval, size_t newlen,
3375                                             void **context)
3376 {
3377         int *valp = table->data;
3378         int new;
3379
3380         if (!newval || !newlen)
3381                 return 0;
3382         if (newlen != sizeof(int))
3383                 return -EINVAL;
3384         if (get_user(new, (int __user *)newval))
3385                 return -EFAULT;
3386         if (new == *valp)
3387                 return 0;
3388         if (oldval && oldlenp) {
3389                 size_t len;
3390                 if (get_user(len, oldlenp))
3391                         return -EFAULT;
3392                 if (len) {
3393                         if (len > table->maxlen)
3394                                 len = table->maxlen;
3395                         if (copy_to_user(oldval, valp, len))
3396                                 return -EFAULT;
3397                         if (put_user(len, oldlenp))
3398                                 return -EFAULT;
3399                 }
3400         }
3401
3402         if (valp != &ipv6_devconf_dflt.forwarding) {
3403                 if (valp != &ipv6_devconf.forwarding) {
3404                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3405                         int changed;
3406                         if (unlikely(idev == NULL))
3407                                 return -ENODEV;
3408                         changed = (!*valp) ^ (!new);
3409                         *valp = new;
3410                         if (changed)
3411                                 dev_forward_change(idev);
3412                 } else {
3413                         *valp = new;
3414                         addrconf_forward_change();
3415                 }
3416
3417                 if (*valp)
3418                         rt6_purge_dflt_routers();
3419         } else
3420                 *valp = new;
3421
3422         return 1;
3423 }
3424
3425 static struct addrconf_sysctl_table
3426 {
3427         struct ctl_table_header *sysctl_header;
3428         ctl_table addrconf_vars[__NET_IPV6_MAX];
3429         ctl_table addrconf_dev[2];
3430         ctl_table addrconf_conf_dir[2];
3431         ctl_table addrconf_proto_dir[2];
3432         ctl_table addrconf_root_dir[2];
3433 } addrconf_sysctl = {
3434         .sysctl_header = NULL,
3435         .addrconf_vars = {
3436                 {
3437                         .ctl_name       =       NET_IPV6_FORWARDING,
3438                         .procname       =       "forwarding",
3439                         .data           =       &ipv6_devconf.forwarding,
3440                         .maxlen         =       sizeof(int),
3441                         .mode           =       0644,
3442                         .proc_handler   =       &addrconf_sysctl_forward,
3443                         .strategy       =       &addrconf_sysctl_forward_strategy,
3444                 },
3445                 {
3446                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3447                         .procname       =       "hop_limit",
3448                         .data           =       &ipv6_devconf.hop_limit,
3449                         .maxlen         =       sizeof(int),
3450                         .mode           =       0644,
3451                         .proc_handler   =       proc_dointvec,
3452                 },
3453                 {
3454                         .ctl_name       =       NET_IPV6_MTU,
3455                         .procname       =       "mtu",
3456                         .data           =       &ipv6_devconf.mtu6,
3457                         .maxlen         =       sizeof(int),
3458                         .mode           =       0644,
3459                         .proc_handler   =       &proc_dointvec,
3460                 },
3461                 {
3462                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3463                         .procname       =       "accept_ra",
3464                         .data           =       &ipv6_devconf.accept_ra,
3465                         .maxlen         =       sizeof(int),
3466                         .mode           =       0644,
3467                         .proc_handler   =       &proc_dointvec,
3468                 },
3469                 {
3470                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3471                         .procname       =       "accept_redirects",
3472                         .data           =       &ipv6_devconf.accept_redirects,
3473                         .maxlen         =       sizeof(int),
3474                         .mode           =       0644,
3475                         .proc_handler   =       &proc_dointvec,
3476                 },
3477                 {
3478                         .ctl_name       =       NET_IPV6_AUTOCONF,
3479                         .procname       =       "autoconf",
3480                         .data           =       &ipv6_devconf.autoconf,
3481                         .maxlen         =       sizeof(int),
3482                         .mode           =       0644,
3483                         .proc_handler   =       &proc_dointvec,
3484                 },
3485                 {
3486                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3487                         .procname       =       "dad_transmits",
3488                         .data           =       &ipv6_devconf.dad_transmits,
3489                         .maxlen         =       sizeof(int),
3490                         .mode           =       0644,
3491                         .proc_handler   =       &proc_dointvec,
3492                 },
3493                 {
3494                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3495                         .procname       =       "router_solicitations",
3496                         .data           =       &ipv6_devconf.rtr_solicits,
3497                         .maxlen         =       sizeof(int),
3498                         .mode           =       0644,
3499                         .proc_handler   =       &proc_dointvec,
3500                 },
3501                 {
3502                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3503                         .procname       =       "router_solicitation_interval",
3504                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3505                         .maxlen         =       sizeof(int),
3506                         .mode           =       0644,
3507                         .proc_handler   =       &proc_dointvec_jiffies,
3508                         .strategy       =       &sysctl_jiffies,
3509                 },
3510                 {
3511                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3512                         .procname       =       "router_solicitation_delay",
3513                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3514                         .maxlen         =       sizeof(int),
3515                         .mode           =       0644,
3516                         .proc_handler   =       &proc_dointvec_jiffies,
3517                         .strategy       =       &sysctl_jiffies,
3518                 },
3519                 {
3520                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3521                         .procname       =       "force_mld_version",
3522                         .data           =       &ipv6_devconf.force_mld_version,
3523                         .maxlen         =       sizeof(int),
3524                         .mode           =       0644,
3525                         .proc_handler   =       &proc_dointvec,
3526                 },
3527 #ifdef CONFIG_IPV6_PRIVACY
3528                 {
3529                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3530                         .procname       =       "use_tempaddr",
3531                         .data           =       &ipv6_devconf.use_tempaddr,
3532                         .maxlen         =       sizeof(int),
3533                         .mode           =       0644,
3534                         .proc_handler   =       &proc_dointvec,
3535                 },
3536                 {
3537                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3538                         .procname       =       "temp_valid_lft",
3539                         .data           =       &ipv6_devconf.temp_valid_lft,
3540                         .maxlen         =       sizeof(int),
3541                         .mode           =       0644,
3542                         .proc_handler   =       &proc_dointvec,
3543                 },
3544                 {
3545                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3546                         .procname       =       "temp_prefered_lft",
3547                         .data           =       &ipv6_devconf.temp_prefered_lft,
3548                         .maxlen         =       sizeof(int),
3549                         .mode           =       0644,
3550                         .proc_handler   =       &proc_dointvec,
3551                 },
3552                 {
3553                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3554                         .procname       =       "regen_max_retry",
3555                         .data           =       &ipv6_devconf.regen_max_retry,
3556                         .maxlen         =       sizeof(int),
3557                         .mode           =       0644,
3558                         .proc_handler   =       &proc_dointvec,
3559                 },
3560                 {
3561                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3562                         .procname       =       "max_desync_factor",
3563                         .data           =       &ipv6_devconf.max_desync_factor,
3564                         .maxlen         =       sizeof(int),
3565                         .mode           =       0644,
3566                         .proc_handler   =       &proc_dointvec,
3567                 },
3568 #endif
3569                 {
3570                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3571                         .procname       =       "max_addresses",
3572                         .data           =       &ipv6_devconf.max_addresses,
3573                         .maxlen         =       sizeof(int),
3574                         .mode           =       0644,
3575                         .proc_handler   =       &proc_dointvec,
3576                 },
3577                 {
3578                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3579                         .procname       =       "accept_ra_defrtr",
3580                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3581                         .maxlen         =       sizeof(int),
3582                         .mode           =       0644,
3583                         .proc_handler   =       &proc_dointvec,
3584                 },
3585                 {
3586                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3587                         .procname       =       "accept_ra_pinfo",
3588                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3589                         .maxlen         =       sizeof(int),
3590                         .mode           =       0644,
3591                         .proc_handler   =       &proc_dointvec,
3592                 },
3593                 {
3594                         .ctl_name       =       0,      /* sentinel */
3595                 }
3596         },
3597         .addrconf_dev = {
3598                 {
3599                         .ctl_name       =       NET_PROTO_CONF_ALL,
3600                         .procname       =       "all",
3601                         .mode           =       0555,
3602                         .child          =       addrconf_sysctl.addrconf_vars,
3603                 },
3604                 {
3605                         .ctl_name       =       0,      /* sentinel */
3606                 }
3607         },
3608         .addrconf_conf_dir = {
3609                 {
3610                         .ctl_name       =       NET_IPV6_CONF,
3611                         .procname       =       "conf",
3612                         .mode           =       0555,
3613                         .child          =       addrconf_sysctl.addrconf_dev,
3614                 },
3615                 {
3616                         .ctl_name       =       0,      /* sentinel */
3617                 }
3618         },
3619         .addrconf_proto_dir = {
3620                 {
3621                         .ctl_name       =       NET_IPV6,
3622                         .procname       =       "ipv6",
3623                         .mode           =       0555,
3624                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3625                 },
3626                 {
3627                         .ctl_name       =       0,      /* sentinel */
3628                 }
3629         },
3630         .addrconf_root_dir = {
3631                 {
3632                         .ctl_name       =       CTL_NET,
3633                         .procname       =       "net",
3634                         .mode           =       0555,
3635                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3636                 },
3637                 {
3638                         .ctl_name       =       0,      /* sentinel */
3639                 }
3640         },
3641 };
3642
3643 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3644 {
3645         int i;
3646         struct net_device *dev = idev ? idev->dev : NULL;
3647         struct addrconf_sysctl_table *t;
3648         char *dev_name = NULL;
3649
3650         t = kmalloc(sizeof(*t), GFP_KERNEL);
3651         if (t == NULL)
3652                 return;
3653         memcpy(t, &addrconf_sysctl, sizeof(*t));
3654         for (i=0; t->addrconf_vars[i].data; i++) {
3655                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3656                 t->addrconf_vars[i].de = NULL;
3657                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3658         }
3659         if (dev) {
3660                 dev_name = dev->name;
3661                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3662         } else {
3663                 dev_name = "default";
3664                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3665         }
3666
3667         /*
3668          * Make a copy of dev_name, because '.procname' is regarded as const
3669          * by sysctl and we wouldn't want anyone to change it under our feet
3670          * (see SIOCSIFNAME).
3671          */
3672         dev_name = kstrdup(dev_name, GFP_KERNEL);
3673         if (!dev_name)
3674             goto free;
3675
3676         t->addrconf_dev[0].procname = dev_name;
3677
3678         t->addrconf_dev[0].child = t->addrconf_vars;
3679         t->addrconf_dev[0].de = NULL;
3680         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3681         t->addrconf_conf_dir[0].de = NULL;
3682         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3683         t->addrconf_proto_dir[0].de = NULL;
3684         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3685         t->addrconf_root_dir[0].de = NULL;
3686
3687         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3688         if (t->sysctl_header == NULL)
3689                 goto free_procname;
3690         else
3691                 p->sysctl = t;
3692         return;
3693
3694         /* error path */
3695  free_procname:
3696         kfree(dev_name);
3697  free:
3698         kfree(t);
3699
3700         return;
3701 }
3702
3703 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3704 {
3705         if (p->sysctl) {
3706                 struct addrconf_sysctl_table *t = p->sysctl;
3707                 p->sysctl = NULL;
3708                 unregister_sysctl_table(t->sysctl_header);
3709                 kfree(t->addrconf_dev[0].procname);
3710                 kfree(t);
3711         }
3712 }
3713
3714
3715 #endif
3716
3717 /*
3718  *      Device notifier
3719  */
3720
3721 int register_inet6addr_notifier(struct notifier_block *nb)
3722 {
3723         return notifier_chain_register(&inet6addr_chain, nb);
3724 }
3725
3726 int unregister_inet6addr_notifier(struct notifier_block *nb)
3727 {
3728         return notifier_chain_unregister(&inet6addr_chain,nb);
3729 }
3730
3731 /*
3732  *      Init / cleanup code
3733  */
3734
3735 int __init addrconf_init(void)
3736 {
3737         int err = 0;
3738
3739         /* The addrconf netdev notifier requires that loopback_dev
3740          * has it's ipv6 private information allocated and setup
3741          * before it can bring up and give link-local addresses
3742          * to other devices which are up.
3743          *
3744          * Unfortunately, loopback_dev is not necessarily the first
3745          * entry in the global dev_base list of net devices.  In fact,
3746          * it is likely to be the very last entry on that list.
3747          * So this causes the notifier registry below to try and
3748          * give link-local addresses to all devices besides loopback_dev
3749          * first, then loopback_dev, which cases all the non-loopback_dev
3750          * devices to fail to get a link-local address.
3751          *
3752          * So, as a temporary fix, allocate the ipv6 structure for
3753          * loopback_dev first by hand.
3754          * Longer term, all of the dependencies ipv6 has upon the loopback
3755          * device and it being up should be removed.
3756          */
3757         rtnl_lock();
3758         if (!ipv6_add_dev(&loopback_dev))
3759                 err = -ENOMEM;
3760         rtnl_unlock();
3761         if (err)
3762                 return err;
3763
3764         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3765
3766         register_netdevice_notifier(&ipv6_dev_notf);
3767
3768         addrconf_verify(0);
3769         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3770 #ifdef CONFIG_SYSCTL
3771         addrconf_sysctl.sysctl_header =
3772                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3773         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3774 #endif
3775
3776         return 0;
3777 }
3778
3779 void __exit addrconf_cleanup(void)
3780 {
3781         struct net_device *dev;
3782         struct inet6_dev *idev;
3783         struct inet6_ifaddr *ifa;
3784         int i;
3785
3786         unregister_netdevice_notifier(&ipv6_dev_notf);
3787
3788         rtnetlink_links[PF_INET6] = NULL;
3789 #ifdef CONFIG_SYSCTL
3790         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3791         addrconf_sysctl_unregister(&ipv6_devconf);
3792 #endif
3793
3794         rtnl_lock();
3795
3796         /*
3797          *      clean dev list.
3798          */
3799
3800         for (dev=dev_base; dev; dev=dev->next) {
3801                 if ((idev = __in6_dev_get(dev)) == NULL)
3802                         continue;
3803                 addrconf_ifdown(dev, 1);
3804         }
3805         addrconf_ifdown(&loopback_dev, 2);
3806
3807         /*
3808          *      Check hash table.
3809          */
3810
3811         write_lock_bh(&addrconf_hash_lock);
3812         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3813                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3814                         struct inet6_ifaddr *bifa;
3815
3816                         bifa = ifa;
3817                         ifa = ifa->lst_next;
3818                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3819                         /* Do not free it; something is wrong.
3820                            Now we can investigate it with debugger.
3821                          */
3822                 }
3823         }
3824         write_unlock_bh(&addrconf_hash_lock);
3825
3826         del_timer(&addr_chk_timer);
3827
3828         rtnl_unlock();
3829
3830 #ifdef CONFIG_PROC_FS
3831         proc_net_remove("if_inet6");
3832 #endif
3833 }