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   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/config.h>
  44 #include <linux/errno.h>
  45 #include <linux/types.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/sched.h>
  49 #include <linux/net.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #ifdef CONFIG_SYSCTL
  59 #include <linux/sysctl.h>
  60 #endif
  61 #include <linux/capability.h>
  62 #include <linux/delay.h>
  63 #include <linux/notifier.h>
  64 #include <linux/string.h>
  65
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <linux/if_tunnel.h>
  77 #include <linux/rtnetlink.h>
  78
  79 #ifdef CONFIG_IPV6_PRIVACY
  80 #include <linux/random.h>
  81 #endif
  82
  83 #include <asm/uaccess.h>
  84
  85 #include <linux/proc_fs.h>
  86 #include <linux/seq_file.h>
  87
  88 /* Set to 3 to get tracing... */
  89 #define ACONF_DEBUG 2
  90
  91 #if ACONF_DEBUG >= 3
  92 #define ADBG(x) printk x
  93 #else
  94 #define ADBG(x)
  95 #endif
  96
  97 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  99
 100 #ifdef CONFIG_SYSCTL
 101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 103 #endif
 104
 105 #ifdef CONFIG_IPV6_PRIVACY
 106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 108 static void ipv6_regen_rndid(unsigned long data);
 109
 110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 111 #endif
 112
 113 static int ipv6_count_addresses(struct inet6_dev *idev);
 114
 115 /*
 116  *      Configured unicast address hash table
 117  */
 118 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 119 static DEFINE_RWLOCK(addrconf_hash_lock);
 120
 121 /* Protects inet6 devices */
 122 DEFINE_RWLOCK(addrconf_lock);
 123
 124 static void addrconf_verify(unsigned long);
 125
 126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 127 static DEFINE_SPINLOCK(addrconf_verify_lock);
 128
 129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 131
 132 static int addrconf_ifdown(struct net_device *dev, int how);
 133
 134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 135 static void addrconf_dad_timer(unsigned long data);
 136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 137 static void addrconf_dad_run(struct inet6_dev *idev);
 138 static void addrconf_rs_timer(unsigned long data);
 139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 141
 142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 143                                 struct prefix_info *pinfo);
 144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 145
 146 static struct notifier_block *inet6addr_chain;
 147
 148 struct ipv6_devconf ipv6_devconf = {
 149         .forwarding             = 0,
 150         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 151         .mtu6                   = IPV6_MIN_MTU,
 152         .accept_ra              = 1,
 153         .accept_redirects       = 1,
 154         .autoconf               = 1,
 155         .force_mld_version      = 0,
 156         .dad_transmits          = 1,
 157         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 158         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 159         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 160 #ifdef CONFIG_IPV6_PRIVACY
 161         .use_tempaddr           = 0,
 162         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 163         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 164         .regen_max_retry        = REGEN_MAX_RETRY,
 165         .max_desync_factor      = MAX_DESYNC_FACTOR,
 166 #endif
 167         .max_addresses          = IPV6_MAX_ADDRESSES,
 168         .accept_ra_defrtr       = 1,
 169         .accept_ra_pinfo        = 1,
 170 #ifdef CONFIG_IPV6_ROUTER_PREF
 171         .accept_ra_rtr_pref     = 1,
 172 #endif
 173 };
 174
 175 static struct ipv6_devconf ipv6_devconf_dflt = {
 176         .forwarding             = 0,
 177         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 178         .mtu6                   = IPV6_MIN_MTU,
 179         .accept_ra              = 1,
 180         .accept_redirects       = 1,
 181         .autoconf               = 1,
 182         .dad_transmits          = 1,
 183         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 184         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 185         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 186 #ifdef CONFIG_IPV6_PRIVACY
 187         .use_tempaddr           = 0,
 188         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 189         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 190         .regen_max_retry        = REGEN_MAX_RETRY,
 191         .max_desync_factor      = MAX_DESYNC_FACTOR,
 192 #endif
 193         .max_addresses          = IPV6_MAX_ADDRESSES,
 194         .accept_ra_defrtr       = 1,
 195         .accept_ra_pinfo        = 1,
 196 #ifdef CONFIG_IPV6_ROUTER_PREF
 197         .accept_ra_rtr_pref     = 1,
 198 #endif
 199 };
 200
 201 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 202 #if 0
 203 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 204 #endif
 205 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 206
 207 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 208
 209 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 210 {
 211         switch(scope) {
 212         case IPV6_ADDR_SCOPE_NODELOCAL:
 213                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 214                         IPV6_ADDR_LOOPBACK);
 215         case IPV6_ADDR_SCOPE_LINKLOCAL:
 216                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 217                         IPV6_ADDR_LINKLOCAL);
 218         case IPV6_ADDR_SCOPE_SITELOCAL:
 219                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 220                         IPV6_ADDR_SITELOCAL);
 221         }
 222         return IPV6_ADDR_SCOPE_TYPE(scope);
 223 }
 224
 225 int __ipv6_addr_type(const struct in6_addr *addr)
 226 {
 227         u32 st;
 228
 229         st = addr->s6_addr32[0];
 230
 231         /* Consider all addresses with the first three bits different of
 232            000 and 111 as unicasts.
 233          */
 234         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 235             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 236                 return (IPV6_ADDR_UNICAST |
 237                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 238
 239         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 240                 /* multicast */
 241                 /* addr-select 3.1 */
 242                 return (IPV6_ADDR_MULTICAST |
 243                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 244         }
 245
 246         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 247                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 248                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 249         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 250                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 251                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 252
 253         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 254                 if (addr->s6_addr32[2] == 0) {
 255                         if (addr->s6_addr32[3] == 0)
 256                                 return IPV6_ADDR_ANY;
 257
 258                         if (addr->s6_addr32[3] == htonl(0x00000001))
 259                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 260                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 261
 262                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 263                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 264                 }
 265
 266                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 267                         return (IPV6_ADDR_MAPPED |
 268                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 269         }
 270
 271         return (IPV6_ADDR_RESERVED |
 272                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 273 }
 274
 275 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 276 {
 277         if (del_timer(&ifp->timer))
 278                 __in6_ifa_put(ifp);
 279 }
 280
 281 enum addrconf_timer_t
 282 {
 283         AC_NONE,
 284         AC_DAD,
 285         AC_RS,
 286 };
 287
 288 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 289                                enum addrconf_timer_t what,
 290                                unsigned long when)
 291 {
 292         if (!del_timer(&ifp->timer))
 293                 in6_ifa_hold(ifp);
 294
 295         switch (what) {
 296         case AC_DAD:
 297                 ifp->timer.function = addrconf_dad_timer;
 298                 break;
 299         case AC_RS:
 300                 ifp->timer.function = addrconf_rs_timer;
 301                 break;
 302         default:;
 303         }
 304         ifp->timer.expires = jiffies + when;
 305         add_timer(&ifp->timer);
 306 }
 307
 308 /* Nobody refers to this device, we may destroy it. */
 309
 310 void in6_dev_finish_destroy(struct inet6_dev *idev)
 311 {
 312         struct net_device *dev = idev->dev;
 313         BUG_TRAP(idev->addr_list==NULL);
 314         BUG_TRAP(idev->mc_list==NULL);
 315 #ifdef NET_REFCNT_DEBUG
 316         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 317 #endif
 318         dev_put(dev);
 319         if (!idev->dead) {
 320                 printk("Freeing alive inet6 device %p\n", idev);
 321                 return;
 322         }
 323         snmp6_free_dev(idev);
 324         kfree(idev);
 325 }
 326
 327 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 328 {
 329         struct inet6_dev *ndev;
 330
 331         ASSERT_RTNL();
 332
 333         if (dev->mtu < IPV6_MIN_MTU)
 334                 return NULL;
 335
 336         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 337
 338         if (ndev) {
 339                 memset(ndev, 0, sizeof(struct inet6_dev));
 340
 341                 rwlock_init(&ndev->lock);
 342                 ndev->dev = dev;
 343                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 344                 ndev->cnf.mtu6 = dev->mtu;
 345                 ndev->cnf.sysctl = NULL;
 346                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 347                 if (ndev->nd_parms == NULL) {
 348                         kfree(ndev);
 349                         return NULL;
 350                 }
 351                 /* We refer to the device */
 352                 dev_hold(dev);
 353
 354                 if (snmp6_alloc_dev(ndev) < 0) {
 355                         ADBG((KERN_WARNING
 356                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
 357                                 __FUNCTION__, dev->name));
 358                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 359                         ndev->dead = 1;
 360                         in6_dev_finish_destroy(ndev);
 361                         return NULL;
 362                 }
 363
 364                 if (snmp6_register_dev(ndev) < 0) {
 365                         ADBG((KERN_WARNING
 366                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 367                                 __FUNCTION__, dev->name));
 368                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 369                         ndev->dead = 1;
 370                         in6_dev_finish_destroy(ndev);
 371                         return NULL;
 372                 }
 373
 374                 /* One reference from device.  We must do this before
 375                  * we invoke __ipv6_regen_rndid().
 376                  */
 377                 in6_dev_hold(ndev);
 378
 379 #ifdef CONFIG_IPV6_PRIVACY
 380                 init_timer(&ndev->regen_timer);
 381                 ndev->regen_timer.function = ipv6_regen_rndid;
 382                 ndev->regen_timer.data = (unsigned long) ndev;
 383                 if ((dev->flags&IFF_LOOPBACK) ||
 384                     dev->type == ARPHRD_TUNNEL ||
 385                     dev->type == ARPHRD_NONE ||
 386                     dev->type == ARPHRD_SIT) {
 387                         printk(KERN_INFO
 388                                "%s: Disabled Privacy Extensions\n",
 389                                dev->name);
 390                         ndev->cnf.use_tempaddr = -1;
 391                 } else {
 392                         in6_dev_hold(ndev);
 393                         ipv6_regen_rndid((unsigned long) ndev);
 394                 }
 395 #endif
 396
 397                 if (netif_carrier_ok(dev))
 398                         ndev->if_flags |= IF_READY;
 399
 400                 write_lock_bh(&addrconf_lock);
 401                 dev->ip6_ptr = ndev;
 402                 write_unlock_bh(&addrconf_lock);
 403
 404                 ipv6_mc_init_dev(ndev);
 405                 ndev->tstamp = jiffies;
 406 #ifdef CONFIG_SYSCTL
 407                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 408                                       NET_IPV6_NEIGH, "ipv6",
 409                                       &ndisc_ifinfo_sysctl_change,
 410                                       NULL);
 411                 addrconf_sysctl_register(ndev, &ndev->cnf);
 412 #endif
 413         }
 414         return ndev;
 415 }
 416
 417 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 418 {
 419         struct inet6_dev *idev;
 420
 421         ASSERT_RTNL();
 422
 423         if ((idev = __in6_dev_get(dev)) == NULL) {
 424                 if ((idev = ipv6_add_dev(dev)) == NULL)
 425                         return NULL;
 426         }
 427
 428         if (dev->flags&IFF_UP)
 429                 ipv6_mc_up(idev);
 430         return idev;
 431 }
 432
 433 #ifdef CONFIG_SYSCTL
 434 static void dev_forward_change(struct inet6_dev *idev)
 435 {
 436         struct net_device *dev;
 437         struct inet6_ifaddr *ifa;
 438         struct in6_addr addr;
 439
 440         if (!idev)
 441                 return;
 442         dev = idev->dev;
 443         if (dev && (dev->flags & IFF_MULTICAST)) {
 444                 ipv6_addr_all_routers(&addr);
 445
 446                 if (idev->cnf.forwarding)
 447                         ipv6_dev_mc_inc(dev, &addr);
 448                 else
 449                         ipv6_dev_mc_dec(dev, &addr);
 450         }
 451         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 452                 if (idev->cnf.forwarding)
 453                         addrconf_join_anycast(ifa);
 454                 else
 455                         addrconf_leave_anycast(ifa);
 456         }
 457 }
 458
 459
 460 static void addrconf_forward_change(void)
 461 {
 462         struct net_device *dev;
 463         struct inet6_dev *idev;
 464
 465         read_lock(&dev_base_lock);
 466         for (dev=dev_base; dev; dev=dev->next) {
 467                 read_lock(&addrconf_lock);
 468                 idev = __in6_dev_get(dev);
 469                 if (idev) {
 470                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 471                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 472                         if (changed)
 473                                 dev_forward_change(idev);
 474                 }
 475                 read_unlock(&addrconf_lock);
 476         }
 477         read_unlock(&dev_base_lock);
 478 }
 479 #endif
 480
 481 /* Nobody refers to this ifaddr, destroy it */
 482
 483 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 484 {
 485         BUG_TRAP(ifp->if_next==NULL);
 486         BUG_TRAP(ifp->lst_next==NULL);
 487 #ifdef NET_REFCNT_DEBUG
 488         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 489 #endif
 490
 491         in6_dev_put(ifp->idev);
 492
 493         if (del_timer(&ifp->timer))
 494                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 495
 496         if (!ifp->dead) {
 497                 printk("Freeing alive inet6 address %p\n", ifp);
 498                 return;
 499         }
 500         dst_release(&ifp->rt->u.dst);
 501
 502         kfree(ifp);
 503 }
 504
 505 /* On success it returns ifp with increased reference count */
 506
 507 static struct inet6_ifaddr *
 508 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 509               int scope, u32 flags)
 510 {
 511         struct inet6_ifaddr *ifa = NULL;
 512         struct rt6_info *rt;
 513         int hash;
 514         int err = 0;
 515
 516         read_lock_bh(&addrconf_lock);
 517         if (idev->dead) {
 518                 err = -ENODEV;                  /*XXX*/
 519                 goto out2;
 520         }
 521
 522         write_lock(&addrconf_hash_lock);
 523
 524         /* Ignore adding duplicate addresses on an interface */
 525         if (ipv6_chk_same_addr(addr, idev->dev)) {
 526                 ADBG(("ipv6_add_addr: already assigned\n"));
 527                 err = -EEXIST;
 528                 goto out;
 529         }
 530
 531         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 532
 533         if (ifa == NULL) {
 534                 ADBG(("ipv6_add_addr: malloc failed\n"));
 535                 err = -ENOBUFS;
 536                 goto out;
 537         }
 538
 539         rt = addrconf_dst_alloc(idev, addr, 0);
 540         if (IS_ERR(rt)) {
 541                 err = PTR_ERR(rt);
 542                 goto out;
 543         }
 544
 545         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 546         ipv6_addr_copy(&ifa->addr, addr);
 547
 548         spin_lock_init(&ifa->lock);
 549         init_timer(&ifa->timer);
 550         ifa->timer.data = (unsigned long) ifa;
 551         ifa->scope = scope;
 552         ifa->prefix_len = pfxlen;
 553         ifa->flags = flags | IFA_F_TENTATIVE;
 554         ifa->cstamp = ifa->tstamp = jiffies;
 555
 556         ifa->idev = idev;
 557         in6_dev_hold(idev);
 558         /* For caller */
 559         in6_ifa_hold(ifa);
 560
 561         /* Add to big hash table */
 562         hash = ipv6_addr_hash(addr);
 563
 564         ifa->lst_next = inet6_addr_lst[hash];
 565         inet6_addr_lst[hash] = ifa;
 566         in6_ifa_hold(ifa);
 567         write_unlock(&addrconf_hash_lock);
 568
 569         write_lock(&idev->lock);
 570         /* Add to inet6_dev unicast addr list. */
 571         ifa->if_next = idev->addr_list;
 572         idev->addr_list = ifa;
 573
 574 #ifdef CONFIG_IPV6_PRIVACY
 575         if (ifa->flags&IFA_F_TEMPORARY) {
 576                 ifa->tmp_next = idev->tempaddr_list;
 577                 idev->tempaddr_list = ifa;
 578                 in6_ifa_hold(ifa);
 579         }
 580 #endif
 581
 582         ifa->rt = rt;
 583
 584         in6_ifa_hold(ifa);
 585         write_unlock(&idev->lock);
 586 out2:
 587         read_unlock_bh(&addrconf_lock);
 588
 589         if (likely(err == 0))
 590                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 591         else {
 592                 kfree(ifa);
 593                 ifa = ERR_PTR(err);
 594         }
 595
 596         return ifa;
 597 out:
 598         write_unlock(&addrconf_hash_lock);
 599         goto out2;
 600 }
 601
 602 /* This function wants to get referenced ifp and releases it before return */
 603
 604 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 605 {
 606         struct inet6_ifaddr *ifa, **ifap;
 607         struct inet6_dev *idev = ifp->idev;
 608         int hash;
 609         int deleted = 0, onlink = 0;
 610         unsigned long expires = jiffies;
 611
 612         hash = ipv6_addr_hash(&ifp->addr);
 613
 614         ifp->dead = 1;
 615
 616         write_lock_bh(&addrconf_hash_lock);
 617         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 618              ifap = &ifa->lst_next) {
 619                 if (ifa == ifp) {
 620                         *ifap = ifa->lst_next;
 621                         __in6_ifa_put(ifp);
 622                         ifa->lst_next = NULL;
 623                         break;
 624                 }
 625         }
 626         write_unlock_bh(&addrconf_hash_lock);
 627
 628         write_lock_bh(&idev->lock);
 629 #ifdef CONFIG_IPV6_PRIVACY
 630         if (ifp->flags&IFA_F_TEMPORARY) {
 631                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 632                      ifap = &ifa->tmp_next) {
 633                         if (ifa == ifp) {
 634                                 *ifap = ifa->tmp_next;
 635                                 if (ifp->ifpub) {
 636                                         in6_ifa_put(ifp->ifpub);
 637                                         ifp->ifpub = NULL;
 638                                 }
 639                                 __in6_ifa_put(ifp);
 640                                 ifa->tmp_next = NULL;
 641                                 break;
 642                         }
 643                 }
 644         }
 645 #endif
 646
 647         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 648                 if (ifa == ifp) {
 649                         *ifap = ifa->if_next;
 650                         __in6_ifa_put(ifp);
 651                         ifa->if_next = NULL;
 652                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 653                                 break;
 654                         deleted = 1;
 655                         continue;
 656                 } else if (ifp->flags & IFA_F_PERMANENT) {
 657                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 658                                               ifp->prefix_len)) {
 659                                 if (ifa->flags & IFA_F_PERMANENT) {
 660                                         onlink = 1;
 661                                         if (deleted)
 662                                                 break;
 663                                 } else {
 664                                         unsigned long lifetime;
 665
 666                                         if (!onlink)
 667                                                 onlink = -1;
 668
 669                                         spin_lock(&ifa->lock);
 670                                         lifetime = min_t(unsigned long,
 671                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 672                                         if (time_before(expires,
 673                                                         ifa->tstamp + lifetime * HZ))
 674                                                 expires = ifa->tstamp + lifetime * HZ;
 675                                         spin_unlock(&ifa->lock);
 676                                 }
 677                         }
 678                 }
 679                 ifap = &ifa->if_next;
 680         }
 681         write_unlock_bh(&idev->lock);
 682
 683         ipv6_ifa_notify(RTM_DELADDR, ifp);
 684
 685         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 686
 687         addrconf_del_timer(ifp);
 688
 689         /*
 690          * Purge or update corresponding prefix
 691          *
 692          * 1) we don't purge prefix here if address was not permanent.
 693          *    prefix is managed by its own lifetime.
 694          * 2) if there're no addresses, delete prefix.
 695          * 3) if there're still other permanent address(es),
 696          *    corresponding prefix is still permanent.
 697          * 4) otherwise, update prefix lifetime to the
 698          *    longest valid lifetime among the corresponding
 699          *    addresses on the device.
 700          *    Note: subsequent RA will update lifetime.
 701          *
 702          * --yoshfuji
 703          */
 704         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 705                 struct in6_addr prefix;
 706                 struct rt6_info *rt;
 707
 708                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 709                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 710
 711                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 712                         if (onlink == 0) {
 713                                 ip6_del_rt(rt, NULL, NULL, NULL);
 714                                 rt = NULL;
 715                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 716                                 rt->rt6i_expires = expires;
 717                                 rt->rt6i_flags |= RTF_EXPIRES;
 718                         }
 719                 }
 720                 dst_release(&rt->u.dst);
 721         }
 722
 723         in6_ifa_put(ifp);
 724 }
 725
 726 #ifdef CONFIG_IPV6_PRIVACY
 727 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 728 {
 729         struct inet6_dev *idev = ifp->idev;
 730         struct in6_addr addr, *tmpaddr;
 731         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 732         int tmp_plen;
 733         int ret = 0;
 734         int max_addresses;
 735
 736         write_lock(&idev->lock);
 737         if (ift) {
 738                 spin_lock_bh(&ift->lock);
 739                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 740                 spin_unlock_bh(&ift->lock);
 741                 tmpaddr = &addr;
 742         } else {
 743                 tmpaddr = NULL;
 744         }
 745 retry:
 746         in6_dev_hold(idev);
 747         if (idev->cnf.use_tempaddr <= 0) {
 748                 write_unlock(&idev->lock);
 749                 printk(KERN_INFO
 750                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 751                 in6_dev_put(idev);
 752                 ret = -1;
 753                 goto out;
 754         }
 755         spin_lock_bh(&ifp->lock);
 756         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 757                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 758                 spin_unlock_bh(&ifp->lock);
 759                 write_unlock(&idev->lock);
 760                 printk(KERN_WARNING
 761                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 762                 in6_dev_put(idev);
 763                 ret = -1;
 764                 goto out;
 765         }
 766         in6_ifa_hold(ifp);
 767         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 768         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 769                 spin_unlock_bh(&ifp->lock);
 770                 write_unlock(&idev->lock);
 771                 printk(KERN_WARNING
 772                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 773                 in6_ifa_put(ifp);
 774                 in6_dev_put(idev);
 775                 ret = -1;
 776                 goto out;
 777         }
 778         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 779         tmp_valid_lft = min_t(__u32,
 780                               ifp->valid_lft,
 781                               idev->cnf.temp_valid_lft);
 782         tmp_prefered_lft = min_t(__u32,
 783                                  ifp->prefered_lft,
 784                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 785         tmp_plen = ifp->prefix_len;
 786         max_addresses = idev->cnf.max_addresses;
 787         tmp_cstamp = ifp->cstamp;
 788         tmp_tstamp = ifp->tstamp;
 789         spin_unlock_bh(&ifp->lock);
 790
 791         write_unlock(&idev->lock);
 792         ift = !max_addresses ||
 793               ipv6_count_addresses(idev) < max_addresses ?
 794                 ipv6_add_addr(idev, &addr, tmp_plen,
 795                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 796         if (!ift || IS_ERR(ift)) {
 797                 in6_ifa_put(ifp);
 798                 in6_dev_put(idev);
 799                 printk(KERN_INFO
 800                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 801                 tmpaddr = &addr;
 802                 write_lock(&idev->lock);
 803                 goto retry;
 804         }
 805
 806         spin_lock_bh(&ift->lock);
 807         ift->ifpub = ifp;
 808         ift->valid_lft = tmp_valid_lft;
 809         ift->prefered_lft = tmp_prefered_lft;
 810         ift->cstamp = tmp_cstamp;
 811         ift->tstamp = tmp_tstamp;
 812         spin_unlock_bh(&ift->lock);
 813
 814         addrconf_dad_start(ift, 0);
 815         in6_ifa_put(ift);
 816         in6_dev_put(idev);
 817 out:
 818         return ret;
 819 }
 820 #endif
 821
 822 /*
 823  *      Choose an appropriate source address (RFC3484)
 824  */
 825 struct ipv6_saddr_score {
 826         int             addr_type;
 827         unsigned int    attrs;
 828         int             matchlen;
 829         int             scope;
 830         unsigned int    rule;
 831 };
 832
 833 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 834 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 835 #define IPV6_SADDR_SCORE_HOA            0x0008
 836 #define IPV6_SADDR_SCORE_OIF            0x0010
 837 #define IPV6_SADDR_SCORE_LABEL          0x0020
 838 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 839
 840 static int inline ipv6_saddr_preferred(int type)
 841 {
 842         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 843                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 844                 return 1;
 845         return 0;
 846 }
 847
 848 /* static matching label */
 849 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 850 {
 851  /*
 852   *     prefix (longest match)  label
 853   *     -----------------------------
 854   *     ::1/128                 0
 855   *     ::/0                    1
 856   *     2002::/16               2
 857   *     ::/96                   3
 858   *     ::ffff:0:0/96           4
 859   */
 860         if (type & IPV6_ADDR_LOOPBACK)
 861                 return 0;
 862         else if (type & IPV6_ADDR_COMPATv4)
 863                 return 3;
 864         else if (type & IPV6_ADDR_MAPPED)
 865                 return 4;
 866         else if (addr->s6_addr16[0] == htons(0x2002))
 867                 return 2;
 868         return 1;
 869 }
 870
 871 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 872                        struct in6_addr *daddr, struct in6_addr *saddr)
 873 {
 874         struct ipv6_saddr_score hiscore;
 875         struct inet6_ifaddr *ifa_result = NULL;
 876         int daddr_type = __ipv6_addr_type(daddr);
 877         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 878         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 879         struct net_device *dev;
 880
 881         memset(&hiscore, 0, sizeof(hiscore));
 882
 883         read_lock(&dev_base_lock);
 884         read_lock(&addrconf_lock);
 885
 886         for (dev = dev_base; dev; dev=dev->next) {
 887                 struct inet6_dev *idev;
 888                 struct inet6_ifaddr *ifa;
 889
 890                 /* Rule 0: Candidate Source Address (section 4)
 891                  *  - multicast and link-local destination address,
 892                  *    the set of candidate source address MUST only
 893                  *    include addresses assigned to interfaces
 894                  *    belonging to the same link as the outgoing
 895                  *    interface.
 896                  * (- For site-local destination addresses, the
 897                  *    set of candidate source addresses MUST only
 898                  *    include addresses assigned to interfaces
 899                  *    belonging to the same site as the outgoing
 900                  *    interface.)
 901                  */
 902                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 903                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 904                     daddr_dev && dev != daddr_dev)
 905                         continue;
 906
 907                 idev = __in6_dev_get(dev);
 908                 if (!idev)
 909                         continue;
 910
 911                 read_lock_bh(&idev->lock);
 912                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 913                         struct ipv6_saddr_score score;
 914
 915                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 916
 917                         /* Rule 0:
 918                          * - Tentative Address (RFC2462 section 5.4)
 919                          *  - A tentative address is not considered
 920                          *    "assigned to an interface" in the traditional
 921                          *    sense.
 922                          * - Candidate Source Address (section 4)
 923                          *  - In any case, anycast addresses, multicast
 924                          *    addresses, and the unspecified address MUST
 925                          *    NOT be included in a candidate set.
 926                          */
 927                         if (ifa->flags & IFA_F_TENTATIVE)
 928                                 continue;
 929                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 930                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 931                                 LIMIT_NETDEBUG(KERN_DEBUG
 932                                                "ADDRCONF: unspecified / multicast address"
 933                                                "assigned as unicast address on %s",
 934                                                dev->name);
 935                                 continue;
 936                         }
 937
 938                         score.attrs = 0;
 939                         score.matchlen = 0;
 940                         score.scope = 0;
 941                         score.rule = 0;
 942
 943                         if (ifa_result == NULL) {
 944                                 /* record it if the first available entry */
 945                                 goto record_it;
 946                         }
 947
 948                         /* Rule 1: Prefer same address */
 949                         if (hiscore.rule < 1) {
 950                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 951                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 952                                 hiscore.rule++;
 953                         }
 954                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 955                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 956                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 957                                         score.rule = 1;
 958                                         goto record_it;
 959                                 }
 960                         } else {
 961                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 962                                         continue;
 963                         }
 964
 965                         /* Rule 2: Prefer appropriate scope */
 966                         if (hiscore.rule < 2) {
 967                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 968                                 hiscore.rule++;
 969                         }
 970                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 971                         if (hiscore.scope < score.scope) {
 972                                 if (hiscore.scope < daddr_scope) {
 973                                         score.rule = 2;
 974                                         goto record_it;
 975                                 } else
 976                                         continue;
 977                         } else if (score.scope < hiscore.scope) {
 978                                 if (score.scope < daddr_scope)
 979                                         continue;
 980                                 else {
 981                                         score.rule = 2;
 982                                         goto record_it;
 983                                 }
 984                         }
 985
 986                         /* Rule 3: Avoid deprecated address */
 987                         if (hiscore.rule < 3) {
 988                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 989                                     !(ifa_result->flags & IFA_F_DEPRECATED))
 990                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 991                                 hiscore.rule++;
 992                         }
 993                         if (ipv6_saddr_preferred(score.addr_type) ||
 994                             !(ifa->flags & IFA_F_DEPRECATED)) {
 995                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 996                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
 997                                         score.rule = 3;
 998                                         goto record_it;
 999                                 }
1000                         } else {
1001                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1002                                         continue;
1003                         }
1004
1005                         /* Rule 4: Prefer home address -- not implemented yet */
1006                         if (hiscore.rule < 4)
1007                                 hiscore.rule++;
1008
1009                         /* Rule 5: Prefer outgoing interface */
1010                         if (hiscore.rule < 5) {
1011                                 if (daddr_dev == NULL ||
1012                                     daddr_dev == ifa_result->idev->dev)
1013                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1014                                 hiscore.rule++;
1015                         }
1016                         if (daddr_dev == NULL ||
1017                             daddr_dev == ifa->idev->dev) {
1018                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1019                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1020                                         score.rule = 5;
1021                                         goto record_it;
1022                                 }
1023                         } else {
1024                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1025                                         continue;
1026                         }
1027
1028                         /* Rule 6: Prefer matching label */
1029                         if (hiscore.rule < 6) {
1030                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1031                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1032                                 hiscore.rule++;
1033                         }
1034                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1035                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1036                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1037                                         score.rule = 6;
1038                                         goto record_it;
1039                                 }
1040                         } else {
1041                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1042                                         continue;
1043                         }
1044
1045 #ifdef CONFIG_IPV6_PRIVACY
1046                         /* Rule 7: Prefer public address
1047                          * Note: prefer temprary address if use_tempaddr >= 2
1048                          */
1049                         if (hiscore.rule < 7) {
1050                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1051                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1052                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1053                                 hiscore.rule++;
1054                         }
1055                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1056                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1057                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1058                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1059                                         score.rule = 7;
1060                                         goto record_it;
1061                                 }
1062                         } else {
1063                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1064                                         continue;
1065                         }
1066 #endif
1067                         /* Rule 8: Use longest matching prefix */
1068                         if (hiscore.rule < 8) {
1069                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1070                                 hiscore.rule++;
1071                         }
1072                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1073                         if (score.matchlen > hiscore.matchlen) {
1074                                 score.rule = 8;
1075                                 goto record_it;
1076                         }
1077 #if 0
1078                         else if (score.matchlen < hiscore.matchlen)
1079                                 continue;
1080 #endif
1081
1082                         /* Final Rule: choose first available one */
1083                         continue;
1084 record_it:
1085                         if (ifa_result)
1086                                 in6_ifa_put(ifa_result);
1087                         in6_ifa_hold(ifa);
1088                         ifa_result = ifa;
1089                         hiscore = score;
1090                 }
1091                 read_unlock_bh(&idev->lock);
1092         }
1093         read_unlock(&addrconf_lock);
1094         read_unlock(&dev_base_lock);
1095
1096         if (!ifa_result)
1097                 return -EADDRNOTAVAIL;
1098
1099         ipv6_addr_copy(saddr, &ifa_result->addr);
1100         in6_ifa_put(ifa_result);
1101         return 0;
1102 }
1103
1104
1105 int ipv6_get_saddr(struct dst_entry *dst,
1106                    struct in6_addr *daddr, struct in6_addr *saddr)
1107 {
1108         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1109 }
1110
1111
1112 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1113 {
1114         struct inet6_dev *idev;
1115         int err = -EADDRNOTAVAIL;
1116
1117         read_lock(&addrconf_lock);
1118         if ((idev = __in6_dev_get(dev)) != NULL) {
1119                 struct inet6_ifaddr *ifp;
1120
1121                 read_lock_bh(&idev->lock);
1122                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1123                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1124                                 ipv6_addr_copy(addr, &ifp->addr);
1125                                 err = 0;
1126                                 break;
1127                         }
1128                 }
1129                 read_unlock_bh(&idev->lock);
1130         }
1131         read_unlock(&addrconf_lock);
1132         return err;
1133 }
1134
1135 static int ipv6_count_addresses(struct inet6_dev *idev)
1136 {
1137         int cnt = 0;
1138         struct inet6_ifaddr *ifp;
1139
1140         read_lock_bh(&idev->lock);
1141         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1142                 cnt++;
1143         read_unlock_bh(&idev->lock);
1144         return cnt;
1145 }
1146
1147 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1148 {
1149         struct inet6_ifaddr * ifp;
1150         u8 hash = ipv6_addr_hash(addr);
1151
1152         read_lock_bh(&addrconf_hash_lock);
1153         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1154                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1155                     !(ifp->flags&IFA_F_TENTATIVE)) {
1156                         if (dev == NULL || ifp->idev->dev == dev ||
1157                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1158                                 break;
1159                 }
1160         }
1161         read_unlock_bh(&addrconf_hash_lock);
1162         return ifp != NULL;
1163 }
1164
1165 static
1166 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1167 {
1168         struct inet6_ifaddr * ifp;
1169         u8 hash = ipv6_addr_hash(addr);
1170
1171         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1172                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1173                         if (dev == NULL || ifp->idev->dev == dev)
1174                                 break;
1175                 }
1176         }
1177         return ifp != NULL;
1178 }
1179
1180 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1181 {
1182         struct inet6_ifaddr * ifp;
1183         u8 hash = ipv6_addr_hash(addr);
1184
1185         read_lock_bh(&addrconf_hash_lock);
1186         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1187                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1188                         if (dev == NULL || ifp->idev->dev == dev ||
1189                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1190                                 in6_ifa_hold(ifp);
1191                                 break;
1192                         }
1193                 }
1194         }
1195         read_unlock_bh(&addrconf_hash_lock);
1196
1197         return ifp;
1198 }
1199
1200 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1201 {
1202         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1203         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1204         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1205         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1206         int sk_ipv6only = ipv6_only_sock(sk);
1207         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1208         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1209         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1210
1211         if (!sk2_rcv_saddr && !sk_ipv6only)
1212                 return 1;
1213
1214         if (addr_type2 == IPV6_ADDR_ANY &&
1215             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1216                 return 1;
1217
1218         if (addr_type == IPV6_ADDR_ANY &&
1219             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1220                 return 1;
1221
1222         if (sk2_rcv_saddr6 &&
1223             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1224                 return 1;
1225
1226         if (addr_type == IPV6_ADDR_MAPPED &&
1227             !sk2_ipv6only &&
1228             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1229                 return 1;
1230
1231         return 0;
1232 }
1233
1234 /* Gets referenced address, destroys ifaddr */
1235
1236 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1237 {
1238         if (ifp->flags&IFA_F_PERMANENT) {
1239                 spin_lock_bh(&ifp->lock);
1240                 addrconf_del_timer(ifp);
1241                 ifp->flags |= IFA_F_TENTATIVE;
1242                 spin_unlock_bh(&ifp->lock);
1243                 in6_ifa_put(ifp);
1244 #ifdef CONFIG_IPV6_PRIVACY
1245         } else if (ifp->flags&IFA_F_TEMPORARY) {
1246                 struct inet6_ifaddr *ifpub;
1247                 spin_lock_bh(&ifp->lock);
1248                 ifpub = ifp->ifpub;
1249                 if (ifpub) {
1250                         in6_ifa_hold(ifpub);
1251                         spin_unlock_bh(&ifp->lock);
1252                         ipv6_create_tempaddr(ifpub, ifp);
1253                         in6_ifa_put(ifpub);
1254                 } else {
1255                         spin_unlock_bh(&ifp->lock);
1256                 }
1257                 ipv6_del_addr(ifp);
1258 #endif
1259         } else
1260                 ipv6_del_addr(ifp);
1261 }
1262
1263 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1264 {
1265         if (net_ratelimit())
1266                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1267         addrconf_dad_stop(ifp);
1268 }
1269
1270 /* Join to solicited addr multicast group. */
1271
1272 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1273 {
1274         struct in6_addr maddr;
1275
1276         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1277                 return;
1278
1279         addrconf_addr_solict_mult(addr, &maddr);
1280         ipv6_dev_mc_inc(dev, &maddr);
1281 }
1282
1283 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1284 {
1285         struct in6_addr maddr;
1286
1287         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1288                 return;
1289
1290         addrconf_addr_solict_mult(addr, &maddr);
1291         __ipv6_dev_mc_dec(idev, &maddr);
1292 }
1293
1294 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1295 {
1296         struct in6_addr addr;
1297         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1298         if (ipv6_addr_any(&addr))
1299                 return;
1300         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1301 }
1302
1303 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1304 {
1305         struct in6_addr addr;
1306         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1307         if (ipv6_addr_any(&addr))
1308                 return;
1309         __ipv6_dev_ac_dec(ifp->idev, &addr);
1310 }
1311
1312 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1313 {
1314         if (dev->addr_len != ETH_ALEN)
1315                 return -1;
1316         memcpy(eui, dev->dev_addr, 3);
1317         memcpy(eui + 5, dev->dev_addr + 3, 3);
1318
1319         /*
1320          * The zSeries OSA network cards can be shared among various
1321          * OS instances, but the OSA cards have only one MAC address.
1322          * This leads to duplicate address conflicts in conjunction
1323          * with IPv6 if more than one instance uses the same card.
1324          *
1325          * The driver for these cards can deliver a unique 16-bit
1326          * identifier for each instance sharing the same card.  It is
1327          * placed instead of 0xFFFE in the interface identifier.  The
1328          * "u" bit of the interface identifier is not inverted in this
1329          * case.  Hence the resulting interface identifier has local
1330          * scope according to RFC2373.
1331          */
1332         if (dev->dev_id) {
1333                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1334                 eui[4] = dev->dev_id & 0xFF;
1335         } else {
1336                 eui[3] = 0xFF;
1337                 eui[4] = 0xFE;
1338                 eui[0] ^= 2;
1339         }
1340         return 0;
1341 }
1342
1343 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1344 {
1345         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1346         if (dev->addr_len != ARCNET_ALEN)
1347                 return -1;
1348         memset(eui, 0, 7);
1349         eui[7] = *(u8*)dev->dev_addr;
1350         return 0;
1351 }
1352
1353 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1354 {
1355         if (dev->addr_len != INFINIBAND_ALEN)
1356                 return -1;
1357         memcpy(eui, dev->dev_addr + 12, 8);
1358         eui[0] |= 2;
1359         return 0;
1360 }
1361
1362 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1363 {
1364         switch (dev->type) {
1365         case ARPHRD_ETHER:
1366         case ARPHRD_FDDI:
1367         case ARPHRD_IEEE802_TR:
1368                 return addrconf_ifid_eui48(eui, dev);
1369         case ARPHRD_ARCNET:
1370                 return addrconf_ifid_arcnet(eui, dev);
1371         case ARPHRD_INFINIBAND:
1372                 return addrconf_ifid_infiniband(eui, dev);
1373         }
1374         return -1;
1375 }
1376
1377 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1378 {
1379         int err = -1;
1380         struct inet6_ifaddr *ifp;
1381
1382         read_lock_bh(&idev->lock);
1383         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1384                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1385                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1386                         err = 0;
1387                         break;
1388                 }
1389         }
1390         read_unlock_bh(&idev->lock);
1391         return err;
1392 }
1393
1394 #ifdef CONFIG_IPV6_PRIVACY
1395 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1396 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1397 {
1398 regen:
1399         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1400         idev->rndid[0] &= ~0x02;
1401
1402         /*
1403          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1404          * check if generated address is not inappropriate
1405          *
1406          *  - Reserved subnet anycast (RFC 2526)
1407          *      11111101 11....11 1xxxxxxx
1408          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1409          *      00-00-5E-FE-xx-xx-xx-xx
1410          *  - value 0
1411          *  - XXX: already assigned to an address on the device
1412          */
1413         if (idev->rndid[0] == 0xfd &&
1414             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1415             (idev->rndid[7]&0x80))
1416                 goto regen;
1417         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1418                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1419                         goto regen;
1420                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1421                         goto regen;
1422         }
1423
1424         return 0;
1425 }
1426
1427 static void ipv6_regen_rndid(unsigned long data)
1428 {
1429         struct inet6_dev *idev = (struct inet6_dev *) data;
1430         unsigned long expires;
1431
1432         read_lock_bh(&addrconf_lock);
1433         write_lock_bh(&idev->lock);
1434
1435         if (idev->dead)
1436                 goto out;
1437
1438         if (__ipv6_regen_rndid(idev) < 0)
1439                 goto out;
1440
1441         expires = jiffies +
1442                 idev->cnf.temp_prefered_lft * HZ -
1443                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1444         if (time_before(expires, jiffies)) {
1445                 printk(KERN_WARNING
1446                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1447                         idev->dev->name);
1448                 goto out;
1449         }
1450
1451         if (!mod_timer(&idev->regen_timer, expires))
1452                 in6_dev_hold(idev);
1453
1454 out:
1455         write_unlock_bh(&idev->lock);
1456         read_unlock_bh(&addrconf_lock);
1457         in6_dev_put(idev);
1458 }
1459
1460 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1461         int ret = 0;
1462
1463         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1464                 ret = __ipv6_regen_rndid(idev);
1465         return ret;
1466 }
1467 #endif
1468
1469 /*
1470  *      Add prefix route.
1471  */
1472
1473 static void
1474 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1475                       unsigned long expires, u32 flags)
1476 {
1477         struct in6_rtmsg rtmsg;
1478
1479         memset(&rtmsg, 0, sizeof(rtmsg));
1480         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1481         rtmsg.rtmsg_dst_len = plen;
1482         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1483         rtmsg.rtmsg_ifindex = dev->ifindex;
1484         rtmsg.rtmsg_info = expires;
1485         rtmsg.rtmsg_flags = RTF_UP|flags;
1486         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1487
1488         /* Prevent useless cloning on PtP SIT.
1489            This thing is done here expecting that the whole
1490            class of non-broadcast devices need not cloning.
1491          */
1492         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1493                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1494
1495         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1496 }
1497
1498 /* Create "default" multicast route to the interface */
1499
1500 static void addrconf_add_mroute(struct net_device *dev)
1501 {
1502         struct in6_rtmsg rtmsg;
1503
1504         memset(&rtmsg, 0, sizeof(rtmsg));
1505         ipv6_addr_set(&rtmsg.rtmsg_dst,
1506                       htonl(0xFF000000), 0, 0, 0);
1507         rtmsg.rtmsg_dst_len = 8;
1508         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1509         rtmsg.rtmsg_ifindex = dev->ifindex;
1510         rtmsg.rtmsg_flags = RTF_UP;
1511         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1512         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1513 }
1514
1515 static void sit_route_add(struct net_device *dev)
1516 {
1517         struct in6_rtmsg rtmsg;
1518
1519         memset(&rtmsg, 0, sizeof(rtmsg));
1520
1521         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1522         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1523
1524         /* prefix length - 96 bits "::d.d.d.d" */
1525         rtmsg.rtmsg_dst_len     = 96;
1526         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1527         rtmsg.rtmsg_ifindex     = dev->ifindex;
1528
1529         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1530 }
1531
1532 static void addrconf_add_lroute(struct net_device *dev)
1533 {
1534         struct in6_addr addr;
1535
1536         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1537         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1538 }
1539
1540 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1541 {
1542         struct inet6_dev *idev;
1543
1544         ASSERT_RTNL();
1545
1546         if ((idev = ipv6_find_idev(dev)) == NULL)
1547                 return NULL;
1548
1549         /* Add default multicast route */
1550         addrconf_add_mroute(dev);
1551
1552         /* Add link local route */
1553         addrconf_add_lroute(dev);
1554         return idev;
1555 }
1556
1557 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1558 {
1559         struct prefix_info *pinfo;
1560         __u32 valid_lft;
1561         __u32 prefered_lft;
1562         int addr_type;
1563         unsigned long rt_expires;
1564         struct inet6_dev *in6_dev;
1565
1566         pinfo = (struct prefix_info *) opt;
1567
1568         if (len < sizeof(struct prefix_info)) {
1569                 ADBG(("addrconf: prefix option too short\n"));
1570                 return;
1571         }
1572
1573         /*
1574          *      Validation checks ([ADDRCONF], page 19)
1575          */
1576
1577         addr_type = ipv6_addr_type(&pinfo->prefix);
1578
1579         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1580                 return;
1581
1582         valid_lft = ntohl(pinfo->valid);
1583         prefered_lft = ntohl(pinfo->prefered);
1584
1585         if (prefered_lft > valid_lft) {
1586                 if (net_ratelimit())
1587                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1588                 return;
1589         }
1590
1591         in6_dev = in6_dev_get(dev);
1592
1593         if (in6_dev == NULL) {
1594                 if (net_ratelimit())
1595                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1596                 return;
1597         }
1598
1599         /*
1600          *      Two things going on here:
1601          *      1) Add routes for on-link prefixes
1602          *      2) Configure prefixes with the auto flag set
1603          */
1604
1605         /* Avoid arithmetic overflow. Really, we could
1606            save rt_expires in seconds, likely valid_lft,
1607            but it would require division in fib gc, that it
1608            not good.
1609          */
1610         if (valid_lft >= 0x7FFFFFFF/HZ)
1611                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1612         else
1613                 rt_expires = valid_lft * HZ;
1614
1615         /*
1616          * We convert this (in jiffies) to clock_t later.
1617          * Avoid arithmetic overflow there as well.
1618          * Overflow can happen only if HZ < USER_HZ.
1619          */
1620         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1621                 rt_expires = 0x7FFFFFFF / USER_HZ;
1622
1623         if (pinfo->onlink) {
1624                 struct rt6_info *rt;
1625                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1626
1627                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1628                         if (rt->rt6i_flags&RTF_EXPIRES) {
1629                                 if (valid_lft == 0) {
1630                                         ip6_del_rt(rt, NULL, NULL, NULL);
1631                                         rt = NULL;
1632                                 } else {
1633                                         rt->rt6i_expires = jiffies + rt_expires;
1634                                 }
1635                         }
1636                 } else if (valid_lft) {
1637                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1638                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1639                 }
1640                 if (rt)
1641                         dst_release(&rt->u.dst);
1642         }
1643
1644         /* Try to figure out our local address for this prefix */
1645
1646         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1647                 struct inet6_ifaddr * ifp;
1648                 struct in6_addr addr;
1649                 int create = 0, update_lft = 0;
1650
1651                 if (pinfo->prefix_len == 64) {
1652                         memcpy(&addr, &pinfo->prefix, 8);
1653                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1654                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1655                                 in6_dev_put(in6_dev);
1656                                 return;
1657                         }
1658                         goto ok;
1659                 }
1660                 if (net_ratelimit())
1661                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1662                                pinfo->prefix_len);
1663                 in6_dev_put(in6_dev);
1664                 return;
1665
1666 ok:
1667
1668                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1669
1670                 if (ifp == NULL && valid_lft) {
1671                         int max_addresses = in6_dev->cnf.max_addresses;
1672
1673                         /* Do not allow to create too much of autoconfigured
1674                          * addresses; this would be too easy way to crash kernel.
1675                          */
1676                         if (!max_addresses ||
1677                             ipv6_count_addresses(in6_dev) < max_addresses)
1678                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1679                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1680
1681                         if (!ifp || IS_ERR(ifp)) {
1682                                 in6_dev_put(in6_dev);
1683                                 return;
1684                         }
1685
1686                         update_lft = create = 1;
1687                         ifp->cstamp = jiffies;
1688                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1689                 }
1690
1691                 if (ifp) {
1692                         int flags;
1693                         unsigned long now;
1694 #ifdef CONFIG_IPV6_PRIVACY
1695                         struct inet6_ifaddr *ift;
1696 #endif
1697                         u32 stored_lft;
1698
1699                         /* update lifetime (RFC2462 5.5.3 e) */
1700                         spin_lock(&ifp->lock);
1701                         now = jiffies;
1702                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1703                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1704                         else
1705                                 stored_lft = 0;
1706                         if (!update_lft && stored_lft) {
1707                                 if (valid_lft > MIN_VALID_LIFETIME ||
1708                                     valid_lft > stored_lft)
1709                                         update_lft = 1;
1710                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1711                                         /* valid_lft <= stored_lft is always true */
1712                                         /* XXX: IPsec */
1713                                         update_lft = 0;
1714                                 } else {
1715                                         valid_lft = MIN_VALID_LIFETIME;
1716                                         if (valid_lft < prefered_lft)
1717                                                 prefered_lft = valid_lft;
1718                                         update_lft = 1;
1719                                 }
1720                         }
1721
1722                         if (update_lft) {
1723                                 ifp->valid_lft = valid_lft;
1724                                 ifp->prefered_lft = prefered_lft;
1725                                 ifp->tstamp = now;
1726                                 flags = ifp->flags;
1727                                 ifp->flags &= ~IFA_F_DEPRECATED;
1728                                 spin_unlock(&ifp->lock);
1729
1730                                 if (!(flags&IFA_F_TENTATIVE))
1731                                         ipv6_ifa_notify(0, ifp);
1732                         } else
1733                                 spin_unlock(&ifp->lock);
1734
1735 #ifdef CONFIG_IPV6_PRIVACY
1736                         read_lock_bh(&in6_dev->lock);
1737                         /* update all temporary addresses in the list */
1738                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1739                                 /*
1740                                  * When adjusting the lifetimes of an existing
1741                                  * temporary address, only lower the lifetimes.
1742                                  * Implementations must not increase the
1743                                  * lifetimes of an existing temporary address
1744                                  * when processing a Prefix Information Option.
1745                                  */
1746                                 spin_lock(&ift->lock);
1747                                 flags = ift->flags;
1748                                 if (ift->valid_lft > valid_lft &&
1749                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1750                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1751                                 if (ift->prefered_lft > prefered_lft &&
1752                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1753                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1754                                 spin_unlock(&ift->lock);
1755                                 if (!(flags&IFA_F_TENTATIVE))
1756                                         ipv6_ifa_notify(0, ift);
1757                         }
1758
1759                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1760                                 /*
1761                                  * When a new public address is created as described in [ADDRCONF],
1762                                  * also create a new temporary address.
1763                                  */
1764                                 read_unlock_bh(&in6_dev->lock);
1765                                 ipv6_create_tempaddr(ifp, NULL);
1766                         } else {
1767                                 read_unlock_bh(&in6_dev->lock);
1768                         }
1769 #endif
1770                         in6_ifa_put(ifp);
1771                         addrconf_verify(0);
1772                 }
1773         }
1774         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1775         in6_dev_put(in6_dev);
1776 }
1777
1778 /*
1779  *      Set destination address.
1780  *      Special case for SIT interfaces where we create a new "virtual"
1781  *      device.
1782  */
1783 int addrconf_set_dstaddr(void __user *arg)
1784 {
1785         struct in6_ifreq ireq;
1786         struct net_device *dev;
1787         int err = -EINVAL;
1788
1789         rtnl_lock();
1790
1791         err = -EFAULT;
1792         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1793                 goto err_exit;
1794
1795         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1796
1797         err = -ENODEV;
1798         if (dev == NULL)
1799                 goto err_exit;
1800
1801         if (dev->type == ARPHRD_SIT) {
1802                 struct ifreq ifr;
1803                 mm_segment_t    oldfs;
1804                 struct ip_tunnel_parm p;
1805
1806                 err = -EADDRNOTAVAIL;
1807                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1808                         goto err_exit;
1809
1810                 memset(&p, 0, sizeof(p));
1811                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1812                 p.iph.saddr = 0;
1813                 p.iph.version = 4;
1814                 p.iph.ihl = 5;
1815                 p.iph.protocol = IPPROTO_IPV6;
1816                 p.iph.ttl = 64;
1817                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1818
1819                 oldfs = get_fs(); set_fs(KERNEL_DS);
1820                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1821                 set_fs(oldfs);
1822
1823                 if (err == 0) {
1824                         err = -ENOBUFS;
1825                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1826                                 goto err_exit;
1827                         err = dev_open(dev);
1828                 }
1829         }
1830
1831 err_exit:
1832         rtnl_unlock();
1833         return err;
1834 }
1835
1836 /*
1837  *      Manual configuration of address on an interface
1838  */
1839 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1840 {
1841         struct inet6_ifaddr *ifp;
1842         struct inet6_dev *idev;
1843         struct net_device *dev;
1844         int scope;
1845
1846         ASSERT_RTNL();
1847
1848         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1849                 return -ENODEV;
1850
1851         if (!(dev->flags&IFF_UP))
1852                 return -ENETDOWN;
1853
1854         if ((idev = addrconf_add_dev(dev)) == NULL)
1855                 return -ENOBUFS;
1856
1857         scope = ipv6_addr_scope(pfx);
1858
1859         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1860         if (!IS_ERR(ifp)) {
1861                 addrconf_dad_start(ifp, 0);
1862                 in6_ifa_put(ifp);
1863                 return 0;
1864         }
1865
1866         return PTR_ERR(ifp);
1867 }
1868
1869 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1870 {
1871         struct inet6_ifaddr *ifp;
1872         struct inet6_dev *idev;
1873         struct net_device *dev;
1874
1875         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1876                 return -ENODEV;
1877
1878         if ((idev = __in6_dev_get(dev)) == NULL)
1879                 return -ENXIO;
1880
1881         read_lock_bh(&idev->lock);
1882         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1883                 if (ifp->prefix_len == plen &&
1884                     ipv6_addr_equal(pfx, &ifp->addr)) {
1885                         in6_ifa_hold(ifp);
1886                         read_unlock_bh(&idev->lock);
1887
1888                         ipv6_del_addr(ifp);
1889
1890                         /* If the last address is deleted administratively,
1891                            disable IPv6 on this interface.
1892                          */
1893                         if (idev->addr_list == NULL)
1894                                 addrconf_ifdown(idev->dev, 1);
1895                         return 0;
1896                 }
1897         }
1898         read_unlock_bh(&idev->lock);
1899         return -EADDRNOTAVAIL;
1900 }
1901
1902
1903 int addrconf_add_ifaddr(void __user *arg)
1904 {
1905         struct in6_ifreq ireq;
1906         int err;
1907
1908         if (!capable(CAP_NET_ADMIN))
1909                 return -EPERM;
1910
1911         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1912                 return -EFAULT;
1913
1914         rtnl_lock();
1915         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1916         rtnl_unlock();
1917         return err;
1918 }
1919
1920 int addrconf_del_ifaddr(void __user *arg)
1921 {
1922         struct in6_ifreq ireq;
1923         int err;
1924
1925         if (!capable(CAP_NET_ADMIN))
1926                 return -EPERM;
1927
1928         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1929                 return -EFAULT;
1930
1931         rtnl_lock();
1932         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1933         rtnl_unlock();
1934         return err;
1935 }
1936
1937 static void sit_add_v4_addrs(struct inet6_dev *idev)
1938 {
1939         struct inet6_ifaddr * ifp;
1940         struct in6_addr addr;
1941         struct net_device *dev;
1942         int scope;
1943
1944         ASSERT_RTNL();
1945
1946         memset(&addr, 0, sizeof(struct in6_addr));
1947         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1948
1949         if (idev->dev->flags&IFF_POINTOPOINT) {
1950                 addr.s6_addr32[0] = htonl(0xfe800000);
1951                 scope = IFA_LINK;
1952         } else {
1953                 scope = IPV6_ADDR_COMPATv4;
1954         }
1955
1956         if (addr.s6_addr32[3]) {
1957                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1958                 if (!IS_ERR(ifp)) {
1959                         spin_lock_bh(&ifp->lock);
1960                         ifp->flags &= ~IFA_F_TENTATIVE;
1961                         spin_unlock_bh(&ifp->lock);
1962                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1963                         in6_ifa_put(ifp);
1964                 }
1965                 return;
1966         }
1967
1968         for (dev = dev_base; dev != NULL; dev = dev->next) {
1969                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1970                 if (in_dev && (dev->flags & IFF_UP)) {
1971                         struct in_ifaddr * ifa;
1972
1973                         int flag = scope;
1974
1975                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1976                                 int plen;
1977
1978                                 addr.s6_addr32[3] = ifa->ifa_local;
1979
1980                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1981                                         continue;
1982                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1983                                         if (idev->dev->flags&IFF_POINTOPOINT)
1984                                                 continue;
1985                                         flag |= IFA_HOST;
1986                                 }
1987                                 if (idev->dev->flags&IFF_POINTOPOINT)
1988                                         plen = 64;
1989                                 else
1990                                         plen = 96;
1991
1992                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1993                                                     IFA_F_PERMANENT);
1994                                 if (!IS_ERR(ifp)) {
1995                                         spin_lock_bh(&ifp->lock);
1996                                         ifp->flags &= ~IFA_F_TENTATIVE;
1997                                         spin_unlock_bh(&ifp->lock);
1998                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1999                                         in6_ifa_put(ifp);
2000                                 }
2001                         }
2002                 }
2003         }
2004 }
2005
2006 static void init_loopback(struct net_device *dev)
2007 {
2008         struct inet6_dev  *idev;
2009         struct inet6_ifaddr * ifp;
2010
2011         /* ::1 */
2012
2013         ASSERT_RTNL();
2014
2015         if ((idev = ipv6_find_idev(dev)) == NULL) {
2016                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2017                 return;
2018         }
2019
2020         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2021         if (!IS_ERR(ifp)) {
2022                 spin_lock_bh(&ifp->lock);
2023                 ifp->flags &= ~IFA_F_TENTATIVE;
2024                 spin_unlock_bh(&ifp->lock);
2025                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2026                 in6_ifa_put(ifp);
2027         }
2028 }
2029
2030 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2031 {
2032         struct inet6_ifaddr * ifp;
2033
2034         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2035         if (!IS_ERR(ifp)) {
2036                 addrconf_dad_start(ifp, 0);
2037                 in6_ifa_put(ifp);
2038         }
2039 }
2040
2041 static void addrconf_dev_config(struct net_device *dev)
2042 {
2043         struct in6_addr addr;
2044         struct inet6_dev    * idev;
2045
2046         ASSERT_RTNL();
2047
2048         if ((dev->type != ARPHRD_ETHER) &&
2049             (dev->type != ARPHRD_FDDI) &&
2050             (dev->type != ARPHRD_IEEE802_TR) &&
2051             (dev->type != ARPHRD_ARCNET) &&
2052             (dev->type != ARPHRD_INFINIBAND)) {
2053                 /* Alas, we support only Ethernet autoconfiguration. */
2054                 return;
2055         }
2056
2057         idev = addrconf_add_dev(dev);
2058         if (idev == NULL)
2059                 return;
2060
2061         memset(&addr, 0, sizeof(struct in6_addr));
2062         addr.s6_addr32[0] = htonl(0xFE800000);
2063
2064         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2065                 addrconf_add_linklocal(idev, &addr);
2066 }
2067
2068 static void addrconf_sit_config(struct net_device *dev)
2069 {
2070         struct inet6_dev *idev;
2071
2072         ASSERT_RTNL();
2073
2074         /*
2075          * Configure the tunnel with one of our IPv4
2076          * addresses... we should configure all of
2077          * our v4 addrs in the tunnel
2078          */
2079
2080         if ((idev = ipv6_find_idev(dev)) == NULL) {
2081                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2082                 return;
2083         }
2084
2085         sit_add_v4_addrs(idev);
2086
2087         if (dev->flags&IFF_POINTOPOINT) {
2088                 addrconf_add_mroute(dev);
2089                 addrconf_add_lroute(dev);
2090         } else
2091                 sit_route_add(dev);
2092 }
2093
2094 static inline int
2095 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2096 {
2097         struct in6_addr lladdr;
2098
2099         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2100                 addrconf_add_linklocal(idev, &lladdr);
2101                 return 0;
2102         }
2103         return -1;
2104 }
2105
2106 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2107 {
2108         struct net_device *link_dev;
2109
2110         /* first try to inherit the link-local address from the link device */
2111         if (idev->dev->iflink &&
2112             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2113                 if (!ipv6_inherit_linklocal(idev, link_dev))
2114                         return;
2115         }
2116         /* then try to inherit it from any device */
2117         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2118                 if (!ipv6_inherit_linklocal(idev, link_dev))
2119                         return;
2120         }
2121         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2122 }
2123
2124 /*
2125  * Autoconfigure tunnel with a link-local address so routing protocols,
2126  * DHCPv6, MLD etc. can be run over the virtual link
2127  */
2128
2129 static void addrconf_ip6_tnl_config(struct net_device *dev)
2130 {
2131         struct inet6_dev *idev;
2132
2133         ASSERT_RTNL();
2134
2135         if ((idev = addrconf_add_dev(dev)) == NULL) {
2136                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2137                 return;
2138         }
2139         ip6_tnl_add_linklocal(idev);
2140 }
2141
2142 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2143                            void * data)
2144 {
2145         struct net_device *dev = (struct net_device *) data;
2146         struct inet6_dev *idev = __in6_dev_get(dev);
2147         int run_pending = 0;
2148
2149         switch(event) {
2150         case NETDEV_UP:
2151         case NETDEV_CHANGE:
2152                 if (event == NETDEV_UP) {
2153                         if (!netif_carrier_ok(dev)) {
2154                                 /* device is not ready yet. */
2155                                 printk(KERN_INFO
2156                                         "ADDRCONF(NETDEV_UP): %s: "
2157                                         "link is not ready\n",
2158                                         dev->name);
2159                                 break;
2160                         }
2161
2162                         if (idev)
2163                                 idev->if_flags |= IF_READY;
2164                 } else {
2165                         if (!netif_carrier_ok(dev)) {
2166                                 /* device is still not ready. */
2167                                 break;
2168                         }
2169
2170                         if (idev) {
2171                                 if (idev->if_flags & IF_READY) {
2172                                         /* device is already configured. */
2173                                         break;
2174                                 }
2175                                 idev->if_flags |= IF_READY;
2176                         }
2177
2178                         printk(KERN_INFO
2179                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2180                                         "link becomes ready\n",
2181                                         dev->name);
2182
2183                         run_pending = 1;
2184                 }
2185
2186                 switch(dev->type) {
2187                 case ARPHRD_SIT:
2188                         addrconf_sit_config(dev);
2189                         break;
2190                 case ARPHRD_TUNNEL6:
2191                         addrconf_ip6_tnl_config(dev);
2192                         break;
2193                 case ARPHRD_LOOPBACK:
2194                         init_loopback(dev);
2195                         break;
2196
2197                 default:
2198                         addrconf_dev_config(dev);
2199                         break;
2200                 };
2201                 if (idev) {
2202                         if (run_pending)
2203                                 addrconf_dad_run(idev);
2204
2205                         /* If the MTU changed during the interface down, when the
2206                            interface up, the changed MTU must be reflected in the
2207                            idev as well as routers.
2208                          */
2209                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2210                                 rt6_mtu_change(dev, dev->mtu);
2211                                 idev->cnf.mtu6 = dev->mtu;
2212                         }
2213                         idev->tstamp = jiffies;
2214                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2215                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2216                            stop IPv6 on this interface.
2217                          */
2218                         if (dev->mtu < IPV6_MIN_MTU)
2219                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2220                 }
2221                 break;
2222
2223         case NETDEV_CHANGEMTU:
2224                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2225                         rt6_mtu_change(dev, dev->mtu);
2226                         idev->cnf.mtu6 = dev->mtu;
2227                         break;
2228                 }
2229
2230                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2231
2232         case NETDEV_DOWN:
2233         case NETDEV_UNREGISTER:
2234                 /*
2235                  *      Remove all addresses from this interface.
2236                  */
2237                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2238                 break;
2239
2240         case NETDEV_CHANGENAME:
2241 #ifdef CONFIG_SYSCTL
2242                 if (idev) {
2243                         addrconf_sysctl_unregister(&idev->cnf);
2244                         neigh_sysctl_unregister(idev->nd_parms);
2245                         neigh_sysctl_register(dev, idev->nd_parms,
2246                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2247                                               &ndisc_ifinfo_sysctl_change,
2248                                               NULL);
2249                         addrconf_sysctl_register(idev, &idev->cnf);
2250                 }
2251 #endif
2252                 break;
2253         };
2254
2255         return NOTIFY_OK;
2256 }
2257
2258 /*
2259  *      addrconf module should be notified of a device going up
2260  */
2261 static struct notifier_block ipv6_dev_notf = {
2262         .notifier_call = addrconf_notify,
2263         .priority = 0
2264 };
2265
2266 static int addrconf_ifdown(struct net_device *dev, int how)
2267 {
2268         struct inet6_dev *idev;
2269         struct inet6_ifaddr *ifa, **bifa;
2270         int i;
2271
2272         ASSERT_RTNL();
2273
2274         if (dev == &loopback_dev && how == 1)
2275                 how = 0;
2276
2277         rt6_ifdown(dev);
2278         neigh_ifdown(&nd_tbl, dev);
2279
2280         idev = __in6_dev_get(dev);
2281         if (idev == NULL)
2282                 return -ENODEV;
2283
2284         /* Step 1: remove reference to ipv6 device from parent device.
2285                    Do not dev_put!
2286          */
2287         if (how == 1) {
2288                 write_lock_bh(&addrconf_lock);
2289                 dev->ip6_ptr = NULL;
2290                 idev->dead = 1;
2291                 write_unlock_bh(&addrconf_lock);
2292
2293                 /* Step 1.5: remove snmp6 entry */
2294                 snmp6_unregister_dev(idev);
2295
2296         }
2297
2298         /* Step 2: clear hash table */
2299         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2300                 bifa = &inet6_addr_lst[i];
2301
2302                 write_lock_bh(&addrconf_hash_lock);
2303                 while ((ifa = *bifa) != NULL) {
2304                         if (ifa->idev == idev) {
2305                                 *bifa = ifa->lst_next;
2306                                 ifa->lst_next = NULL;
2307                                 addrconf_del_timer(ifa);
2308                                 in6_ifa_put(ifa);
2309                                 continue;
2310                         }
2311                         bifa = &ifa->lst_next;
2312                 }
2313                 write_unlock_bh(&addrconf_hash_lock);
2314         }
2315
2316         write_lock_bh(&idev->lock);
2317
2318         /* Step 3: clear flags for stateless addrconf */
2319         if (how != 1)
2320                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2321
2322         /* Step 4: clear address list */
2323 #ifdef CONFIG_IPV6_PRIVACY
2324         if (how == 1 && del_timer(&idev->regen_timer))
2325                 in6_dev_put(idev);
2326
2327         /* clear tempaddr list */
2328         while ((ifa = idev->tempaddr_list) != NULL) {
2329                 idev->tempaddr_list = ifa->tmp_next;
2330                 ifa->tmp_next = NULL;
2331                 ifa->dead = 1;
2332                 write_unlock_bh(&idev->lock);
2333                 spin_lock_bh(&ifa->lock);
2334
2335                 if (ifa->ifpub) {
2336                         in6_ifa_put(ifa->ifpub);
2337                         ifa->ifpub = NULL;
2338                 }
2339                 spin_unlock_bh(&ifa->lock);
2340                 in6_ifa_put(ifa);
2341                 write_lock_bh(&idev->lock);
2342         }
2343 #endif
2344         while ((ifa = idev->addr_list) != NULL) {
2345                 idev->addr_list = ifa->if_next;
2346                 ifa->if_next = NULL;
2347                 ifa->dead = 1;
2348                 addrconf_del_timer(ifa);
2349                 write_unlock_bh(&idev->lock);
2350
2351                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2352                 in6_ifa_put(ifa);
2353
2354                 write_lock_bh(&idev->lock);
2355         }
2356         write_unlock_bh(&idev->lock);
2357
2358         /* Step 5: Discard multicast list */
2359
2360         if (how == 1)
2361                 ipv6_mc_destroy_dev(idev);
2362         else
2363                 ipv6_mc_down(idev);
2364
2365         /* Step 5: netlink notification of this interface */
2366         idev->tstamp = jiffies;
2367         inet6_ifinfo_notify(RTM_DELLINK, idev);
2368
2369         /* Shot the device (if unregistered) */
2370
2371         if (how == 1) {
2372 #ifdef CONFIG_SYSCTL
2373                 addrconf_sysctl_unregister(&idev->cnf);
2374                 neigh_sysctl_unregister(idev->nd_parms);
2375 #endif
2376                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2377                 neigh_ifdown(&nd_tbl, dev);
2378                 in6_dev_put(idev);
2379         }
2380         return 0;
2381 }
2382
2383 static void addrconf_rs_timer(unsigned long data)
2384 {
2385         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2386
2387         if (ifp->idev->cnf.forwarding)
2388                 goto out;
2389
2390         if (ifp->idev->if_flags & IF_RA_RCVD) {
2391                 /*
2392                  *      Announcement received after solicitation
2393                  *      was sent
2394                  */
2395                 goto out;
2396         }
2397
2398         spin_lock(&ifp->lock);
2399         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2400                 struct in6_addr all_routers;
2401
2402                 /* The wait after the last probe can be shorter */
2403                 addrconf_mod_timer(ifp, AC_RS,
2404                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2405                                    ifp->idev->cnf.rtr_solicit_delay :
2406                                    ifp->idev->cnf.rtr_solicit_interval);
2407                 spin_unlock(&ifp->lock);
2408
2409                 ipv6_addr_all_routers(&all_routers);
2410
2411                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2412         } else {
2413                 spin_unlock(&ifp->lock);
2414                 /*
2415                  * Note: we do not support deprecated "all on-link"
2416                  * assumption any longer.
2417                  */
2418                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2419                        ifp->idev->dev->name);
2420         }
2421
2422 out:
2423         in6_ifa_put(ifp);
2424 }
2425
2426 /*
2427  *      Duplicate Address Detection
2428  */
2429 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2430 {
2431         unsigned long rand_num;
2432         struct inet6_dev *idev = ifp->idev;
2433
2434         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2435         ifp->probes = idev->cnf.dad_transmits;
2436         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2437 }
2438
2439 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2440 {
2441         struct inet6_dev *idev = ifp->idev;
2442         struct net_device *dev = idev->dev;
2443
2444         addrconf_join_solict(dev, &ifp->addr);
2445
2446         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2447                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2448                                         flags);
2449
2450         net_srandom(ifp->addr.s6_addr32[3]);
2451
2452         read_lock_bh(&idev->lock);
2453         if (ifp->dead)
2454                 goto out;
2455         spin_lock_bh(&ifp->lock);
2456
2457         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2458             !(ifp->flags&IFA_F_TENTATIVE)) {
2459                 ifp->flags &= ~IFA_F_TENTATIVE;
2460                 spin_unlock_bh(&ifp->lock);
2461                 read_unlock_bh(&idev->lock);
2462
2463                 addrconf_dad_completed(ifp);
2464                 return;
2465         }
2466
2467         if (!(idev->if_flags & IF_READY)) {
2468                 spin_unlock_bh(&ifp->lock);
2469                 read_unlock_bh(&idev->lock);
2470                 /*
2471                  * If the defice is not ready:
2472                  * - keep it tentative if it is a permanent address.
2473                  * - otherwise, kill it.
2474                  */
2475                 in6_ifa_hold(ifp);
2476                 addrconf_dad_stop(ifp);
2477                 return;
2478         }
2479         addrconf_dad_kick(ifp);
2480         spin_unlock_bh(&ifp->lock);
2481 out:
2482         read_unlock_bh(&idev->lock);
2483 }
2484
2485 static void addrconf_dad_timer(unsigned long data)
2486 {
2487         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2488         struct inet6_dev *idev = ifp->idev;
2489         struct in6_addr unspec;
2490         struct in6_addr mcaddr;
2491
2492         read_lock_bh(&idev->lock);
2493         if (idev->dead) {
2494                 read_unlock_bh(&idev->lock);
2495                 goto out;
2496         }
2497         spin_lock_bh(&ifp->lock);
2498         if (ifp->probes == 0) {
2499                 /*
2500                  * DAD was successful
2501                  */
2502
2503                 ifp->flags &= ~IFA_F_TENTATIVE;
2504                 spin_unlock_bh(&ifp->lock);
2505                 read_unlock_bh(&idev->lock);
2506
2507                 addrconf_dad_completed(ifp);
2508
2509                 goto out;
2510         }
2511
2512         ifp->probes--;
2513         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2514         spin_unlock_bh(&ifp->lock);
2515         read_unlock_bh(&idev->lock);
2516
2517         /* send a neighbour solicitation for our addr */
2518         memset(&unspec, 0, sizeof(unspec));
2519         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2520         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2521 out:
2522         in6_ifa_put(ifp);
2523 }
2524
2525 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2526 {
2527         struct net_device *     dev = ifp->idev->dev;
2528
2529         /*
2530          *      Configure the address for reception. Now it is valid.
2531          */
2532
2533         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2534
2535         /* If added prefix is link local and forwarding is off,
2536            start sending router solicitations.
2537          */
2538
2539         if (ifp->idev->cnf.forwarding == 0 &&
2540             ifp->idev->cnf.rtr_solicits > 0 &&
2541             (dev->flags&IFF_LOOPBACK) == 0 &&
2542             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2543                 struct in6_addr all_routers;
2544
2545                 ipv6_addr_all_routers(&all_routers);
2546
2547                 /*
2548                  *      If a host as already performed a random delay
2549                  *      [...] as part of DAD [...] there is no need
2550                  *      to delay again before sending the first RS
2551                  */
2552                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2553
2554                 spin_lock_bh(&ifp->lock);
2555                 ifp->probes = 1;
2556                 ifp->idev->if_flags |= IF_RS_SENT;
2557                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2558                 spin_unlock_bh(&ifp->lock);
2559         }
2560 }
2561
2562 static void addrconf_dad_run(struct inet6_dev *idev) {
2563         struct inet6_ifaddr *ifp;
2564
2565         read_lock_bh(&idev->lock);
2566         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2567                 spin_lock_bh(&ifp->lock);
2568                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2569                         spin_unlock_bh(&ifp->lock);
2570                         continue;
2571                 }
2572                 spin_unlock_bh(&ifp->lock);
2573                 addrconf_dad_kick(ifp);
2574         }
2575         read_unlock_bh(&idev->lock);
2576 }
2577
2578 #ifdef CONFIG_PROC_FS
2579 struct if6_iter_state {
2580         int bucket;
2581 };
2582
2583 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2584 {
2585         struct inet6_ifaddr *ifa = NULL;
2586         struct if6_iter_state *state = seq->private;
2587
2588         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2589                 ifa = inet6_addr_lst[state->bucket];
2590                 if (ifa)
2591                         break;
2592         }
2593         return ifa;
2594 }
2595
2596 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2597 {
2598         struct if6_iter_state *state = seq->private;
2599
2600         ifa = ifa->lst_next;
2601 try_again:
2602         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2603                 ifa = inet6_addr_lst[state->bucket];
2604                 goto try_again;
2605         }
2606         return ifa;
2607 }
2608
2609 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2610 {
2611         struct inet6_ifaddr *ifa = if6_get_first(seq);
2612
2613         if (ifa)
2614                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2615                         --pos;
2616         return pos ? NULL : ifa;
2617 }
2618
2619 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2620 {
2621         read_lock_bh(&addrconf_hash_lock);
2622         return if6_get_idx(seq, *pos);
2623 }
2624
2625 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2626 {
2627         struct inet6_ifaddr *ifa;
2628
2629         ifa = if6_get_next(seq, v);
2630         ++*pos;
2631         return ifa;
2632 }
2633
2634 static void if6_seq_stop(struct seq_file *seq, void *v)
2635 {
2636         read_unlock_bh(&addrconf_hash_lock);
2637 }
2638
2639 static int if6_seq_show(struct seq_file *seq, void *v)
2640 {
2641         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2642         seq_printf(seq,
2643                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2644                    NIP6(ifp->addr),
2645                    ifp->idev->dev->ifindex,
2646                    ifp->prefix_len,
2647                    ifp->scope,
2648                    ifp->flags,
2649                    ifp->idev->dev->name);
2650         return 0;
2651 }
2652
2653 static struct seq_operations if6_seq_ops = {
2654         .start  = if6_seq_start,
2655         .next   = if6_seq_next,
2656         .show   = if6_seq_show,
2657         .stop   = if6_seq_stop,
2658 };
2659
2660 static int if6_seq_open(struct inode *inode, struct file *file)
2661 {
2662         struct seq_file *seq;
2663         int rc = -ENOMEM;
2664         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2665
2666         if (!s)
2667                 goto out;
2668         memset(s, 0, sizeof(*s));
2669
2670         rc = seq_open(file, &if6_seq_ops);
2671         if (rc)
2672                 goto out_kfree;
2673
2674         seq = file->private_data;
2675         seq->private = s;
2676 out:
2677         return rc;
2678 out_kfree:
2679         kfree(s);
2680         goto out;
2681 }
2682
2683 static struct file_operations if6_fops = {
2684         .owner          = THIS_MODULE,
2685         .open           = if6_seq_open,
2686         .read           = seq_read,
2687         .llseek         = seq_lseek,
2688         .release        = seq_release_private,
2689 };
2690
2691 int __init if6_proc_init(void)
2692 {
2693         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2694                 return -ENOMEM;
2695         return 0;
2696 }
2697
2698 void if6_proc_exit(void)
2699 {
2700         proc_net_remove("if_inet6");
2701 }
2702 #endif  /* CONFIG_PROC_FS */
2703
2704 /*
2705  *      Periodic address status verification
2706  */
2707
2708 static void addrconf_verify(unsigned long foo)
2709 {
2710         struct inet6_ifaddr *ifp;
2711         unsigned long now, next;
2712         int i;
2713
2714         spin_lock_bh(&addrconf_verify_lock);
2715         now = jiffies;
2716         next = now + ADDR_CHECK_FREQUENCY;
2717
2718         del_timer(&addr_chk_timer);
2719
2720         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2721
2722 restart:
2723                 read_lock(&addrconf_hash_lock);
2724                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2725                         unsigned long age;
2726 #ifdef CONFIG_IPV6_PRIVACY
2727                         unsigned long regen_advance;
2728 #endif
2729
2730                         if (ifp->flags & IFA_F_PERMANENT)
2731                                 continue;
2732
2733                         spin_lock(&ifp->lock);
2734                         age = (now - ifp->tstamp) / HZ;
2735
2736 #ifdef CONFIG_IPV6_PRIVACY
2737                         regen_advance = ifp->idev->cnf.regen_max_retry *
2738                                         ifp->idev->cnf.dad_transmits *
2739                                         ifp->idev->nd_parms->retrans_time / HZ;
2740 #endif
2741
2742                         if (age >= ifp->valid_lft) {
2743                                 spin_unlock(&ifp->lock);
2744                                 in6_ifa_hold(ifp);
2745                                 read_unlock(&addrconf_hash_lock);
2746                                 ipv6_del_addr(ifp);
2747                                 goto restart;
2748                         } else if (age >= ifp->prefered_lft) {
2749                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2750                                 int deprecate = 0;
2751
2752                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2753                                         deprecate = 1;
2754                                         ifp->flags |= IFA_F_DEPRECATED;
2755                                 }
2756
2757                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2758                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2759
2760                                 spin_unlock(&ifp->lock);
2761
2762                                 if (deprecate) {
2763                                         in6_ifa_hold(ifp);
2764                                         read_unlock(&addrconf_hash_lock);
2765
2766                                         ipv6_ifa_notify(0, ifp);
2767                                         in6_ifa_put(ifp);
2768                                         goto restart;
2769                                 }
2770 #ifdef CONFIG_IPV6_PRIVACY
2771                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2772                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2773                                 if (age >= ifp->prefered_lft - regen_advance) {
2774                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2775                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2776                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2777                                         if (!ifp->regen_count && ifpub) {
2778                                                 ifp->regen_count++;
2779                                                 in6_ifa_hold(ifp);
2780                                                 in6_ifa_hold(ifpub);
2781                                                 spin_unlock(&ifp->lock);
2782                                                 read_unlock(&addrconf_hash_lock);
2783                                                 spin_lock(&ifpub->lock);
2784                                                 ifpub->regen_count = 0;
2785                                                 spin_unlock(&ifpub->lock);
2786                                                 ipv6_create_tempaddr(ifpub, ifp);
2787                                                 in6_ifa_put(ifpub);
2788                                                 in6_ifa_put(ifp);
2789                                                 goto restart;
2790                                         }
2791                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2792                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2793                                 spin_unlock(&ifp->lock);
2794 #endif
2795                         } else {
2796                                 /* ifp->prefered_lft <= ifp->valid_lft */
2797                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2798                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2799                                 spin_unlock(&ifp->lock);
2800                         }
2801                 }
2802                 read_unlock(&addrconf_hash_lock);
2803         }
2804
2805         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2806         add_timer(&addr_chk_timer);
2807         spin_unlock_bh(&addrconf_verify_lock);
2808 }
2809
2810 static int
2811 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2812 {
2813         struct rtattr **rta = arg;
2814         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2815         struct in6_addr *pfx;
2816
2817         pfx = NULL;
2818         if (rta[IFA_ADDRESS-1]) {
2819                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2820                         return -EINVAL;
2821                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2822         }
2823         if (rta[IFA_LOCAL-1]) {
2824                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2825                         return -EINVAL;
2826                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2827         }
2828         if (pfx == NULL)
2829                 return -EINVAL;
2830
2831         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2832 }
2833
2834 static int
2835 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2836 {
2837         struct rtattr  **rta = arg;
2838         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2839         struct in6_addr *pfx;
2840
2841         pfx = NULL;
2842         if (rta[IFA_ADDRESS-1]) {
2843                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2844                         return -EINVAL;
2845                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2846         }
2847         if (rta[IFA_LOCAL-1]) {
2848                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2849                         return -EINVAL;
2850                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2851         }
2852         if (pfx == NULL)
2853                 return -EINVAL;
2854
2855         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2856 }
2857
2858 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2859                              u32 pid, u32 seq, int event, unsigned int flags)
2860 {
2861         struct ifaddrmsg *ifm;
2862         struct nlmsghdr  *nlh;
2863         struct ifa_cacheinfo ci;
2864         unsigned char    *b = skb->tail;
2865
2866         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2867         ifm = NLMSG_DATA(nlh);
2868         ifm->ifa_family = AF_INET6;
2869         ifm->ifa_prefixlen = ifa->prefix_len;
2870         ifm->ifa_flags = ifa->flags;
2871         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2872         if (ifa->scope&IFA_HOST)
2873                 ifm->ifa_scope = RT_SCOPE_HOST;
2874         else if (ifa->scope&IFA_LINK)
2875                 ifm->ifa_scope = RT_SCOPE_LINK;
2876         else if (ifa->scope&IFA_SITE)
2877                 ifm->ifa_scope = RT_SCOPE_SITE;
2878         ifm->ifa_index = ifa->idev->dev->ifindex;
2879         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2880         if (!(ifa->flags&IFA_F_PERMANENT)) {
2881                 ci.ifa_prefered = ifa->prefered_lft;
2882                 ci.ifa_valid = ifa->valid_lft;
2883                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2884                         long tval = (jiffies - ifa->tstamp)/HZ;
2885                         ci.ifa_prefered -= tval;
2886                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2887                                 ci.ifa_valid -= tval;
2888                 }
2889         } else {
2890                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2891                 ci.ifa_valid = INFINITY_LIFE_TIME;
2892         }
2893         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2894                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2895         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2896                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2897         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2898         nlh->nlmsg_len = skb->tail - b;
2899         return skb->len;
2900
2901 nlmsg_failure:
2902 rtattr_failure:
2903         skb_trim(skb, b - skb->data);
2904         return -1;
2905 }
2906
2907 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2908                                 u32 pid, u32 seq, int event, u16 flags)
2909 {
2910         struct ifaddrmsg *ifm;
2911         struct nlmsghdr  *nlh;
2912         struct ifa_cacheinfo ci;
2913         unsigned char    *b = skb->tail;
2914
2915         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2916         ifm = NLMSG_DATA(nlh);
2917         ifm->ifa_family = AF_INET6;
2918         ifm->ifa_prefixlen = 128;
2919         ifm->ifa_flags = IFA_F_PERMANENT;
2920         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2921         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2922                 ifm->ifa_scope = RT_SCOPE_SITE;
2923         ifm->ifa_index = ifmca->idev->dev->ifindex;
2924         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2925         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2926                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2927                     * 100 / HZ);
2928         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2929                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2930                     * 100 / HZ);
2931         ci.ifa_prefered = INFINITY_LIFE_TIME;
2932         ci.ifa_valid = INFINITY_LIFE_TIME;
2933         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2934         nlh->nlmsg_len = skb->tail - b;
2935         return skb->len;
2936
2937 nlmsg_failure:
2938 rtattr_failure:
2939         skb_trim(skb, b - skb->data);
2940         return -1;
2941 }
2942
2943 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2944                                 u32 pid, u32 seq, int event, unsigned int flags)
2945 {
2946         struct ifaddrmsg *ifm;
2947         struct nlmsghdr  *nlh;
2948         struct ifa_cacheinfo ci;
2949         unsigned char    *b = skb->tail;
2950
2951         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2952         ifm = NLMSG_DATA(nlh);
2953         ifm->ifa_family = AF_INET6;
2954         ifm->ifa_prefixlen = 128;
2955         ifm->ifa_flags = IFA_F_PERMANENT;
2956         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2957         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2958                 ifm->ifa_scope = RT_SCOPE_SITE;
2959         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2960         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2961         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2962                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2963                     * 100 / HZ);
2964         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2965                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2966                     * 100 / HZ);
2967         ci.ifa_prefered = INFINITY_LIFE_TIME;
2968         ci.ifa_valid = INFINITY_LIFE_TIME;
2969         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2970         nlh->nlmsg_len = skb->tail - b;
2971         return skb->len;
2972
2973 nlmsg_failure:
2974 rtattr_failure:
2975         skb_trim(skb, b - skb->data);
2976         return -1;
2977 }
2978
2979 enum addr_type_t
2980 {
2981         UNICAST_ADDR,
2982         MULTICAST_ADDR,
2983         ANYCAST_ADDR,
2984 };
2985
2986 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2987                            enum addr_type_t type)
2988 {
2989         int idx, ip_idx;
2990         int s_idx, s_ip_idx;
2991         int err = 1;
2992         struct net_device *dev;
2993         struct inet6_dev *idev = NULL;
2994         struct inet6_ifaddr *ifa;
2995         struct ifmcaddr6 *ifmca;
2996         struct ifacaddr6 *ifaca;
2997
2998         s_idx = cb->args[0];
2999         s_ip_idx = ip_idx = cb->args[1];
3000         read_lock(&dev_base_lock);
3001
3002         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3003                 if (idx < s_idx)
3004                         continue;
3005                 if (idx > s_idx)
3006                         s_ip_idx = 0;
3007                 ip_idx = 0;
3008                 if ((idev = in6_dev_get(dev)) == NULL)
3009                         continue;
3010                 read_lock_bh(&idev->lock);
3011                 switch (type) {
3012                 case UNICAST_ADDR:
3013                         /* unicast address incl. temp addr */
3014                         for (ifa = idev->addr_list; ifa;
3015                              ifa = ifa->if_next, ip_idx++) {
3016                                 if (ip_idx < s_ip_idx)
3017                                         continue;
3018                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3019                                     NETLINK_CB(cb->skb).pid,
3020                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3021                                     NLM_F_MULTI)) <= 0)
3022                                         goto done;
3023                         }
3024                         break;
3025                 case MULTICAST_ADDR:
3026                         /* multicast address */
3027                         for (ifmca = idev->mc_list; ifmca;
3028                              ifmca = ifmca->next, ip_idx++) {
3029                                 if (ip_idx < s_ip_idx)
3030                                         continue;
3031                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3032                                     NETLINK_CB(cb->skb).pid,
3033                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3034                                     NLM_F_MULTI)) <= 0)
3035                                         goto done;
3036                         }
3037                         break;
3038                 case ANYCAST_ADDR:
3039                         /* anycast address */
3040                         for (ifaca = idev->ac_list; ifaca;
3041                              ifaca = ifaca->aca_next, ip_idx++) {
3042                                 if (ip_idx < s_ip_idx)
3043                                         continue;
3044                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3045                                     NETLINK_CB(cb->skb).pid,
3046                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3047                                     NLM_F_MULTI)) <= 0)
3048                                         goto done;
3049                         }
3050                         break;
3051                 default:
3052                         break;
3053                 }
3054                 read_unlock_bh(&idev->lock);
3055                 in6_dev_put(idev);
3056         }
3057 done:
3058         if (err <= 0) {
3059                 read_unlock_bh(&idev->lock);
3060                 in6_dev_put(idev);
3061         }
3062         read_unlock(&dev_base_lock);
3063         cb->args[0] = idx;
3064         cb->args[1] = ip_idx;
3065         return skb->len;
3066 }
3067
3068 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3069 {
3070         enum addr_type_t type = UNICAST_ADDR;
3071         return inet6_dump_addr(skb, cb, type);
3072 }
3073
3074 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3075 {
3076         enum addr_type_t type = MULTICAST_ADDR;
3077         return inet6_dump_addr(skb, cb, type);
3078 }
3079
3080
3081 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3082 {
3083         enum addr_type_t type = ANYCAST_ADDR;
3084         return inet6_dump_addr(skb, cb, type);
3085 }
3086
3087 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3088 {
3089         struct sk_buff *skb;
3090         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3091
3092         skb = alloc_skb(size, GFP_ATOMIC);
3093         if (!skb) {
3094                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3095                 return;
3096         }
3097         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3098                 kfree_skb(skb);
3099                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3100                 return;
3101         }
3102         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3103         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3104 }
3105
3106 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3107                                 __s32 *array, int bytes)
3108 {
3109         memset(array, 0, bytes);
3110         array[DEVCONF_FORWARDING] = cnf->forwarding;
3111         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3112         array[DEVCONF_MTU6] = cnf->mtu6;
3113         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3114         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3115         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3116         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3117         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3118         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3119         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3120         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3121 #ifdef CONFIG_IPV6_PRIVACY
3122         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3123         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3124         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3125         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3126         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3127 #endif
3128         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3129         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3130         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3131 #ifdef CONFIG_IPV6_ROUTER_PREF
3132         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3133 #endif
3134 }
3135
3136 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3137                              u32 pid, u32 seq, int event, unsigned int flags)
3138 {
3139         struct net_device       *dev = idev->dev;
3140         __s32                   *array = NULL;
3141         struct ifinfomsg        *r;
3142         struct nlmsghdr         *nlh;
3143         unsigned char           *b = skb->tail;
3144         struct rtattr           *subattr;
3145         __u32                   mtu = dev->mtu;
3146         struct ifla_cacheinfo   ci;
3147
3148         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3149         r = NLMSG_DATA(nlh);
3150         r->ifi_family = AF_INET6;
3151         r->__ifi_pad = 0;
3152         r->ifi_type = dev->type;
3153         r->ifi_index = dev->ifindex;
3154         r->ifi_flags = dev_get_flags(dev);
3155         r->ifi_change = 0;
3156
3157         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3158
3159         if (dev->addr_len)
3160                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3161
3162         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3163         if (dev->ifindex != dev->iflink)
3164                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3165
3166         subattr = (struct rtattr*)skb->tail;
3167
3168         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3169
3170         /* return the device flags */
3171         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3172
3173         /* return interface cacheinfo */
3174         ci.max_reasm_len = IPV6_MAXPLEN;
3175         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3176                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3177         ci.reachable_time = idev->nd_parms->reachable_time;
3178         ci.retrans_time = idev->nd_parms->retrans_time;
3179         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3180
3181         /* return the device sysctl params */
3182         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3183                 goto rtattr_failure;
3184         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3185         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3186
3187         /* XXX - Statistics/MC not implemented */
3188         subattr->rta_len = skb->tail - (u8*)subattr;
3189
3190         nlh->nlmsg_len = skb->tail - b;
3191         kfree(array);
3192         return skb->len;
3193
3194 nlmsg_failure:
3195 rtattr_failure:
3196         kfree(array);
3197         skb_trim(skb, b - skb->data);
3198         return -1;
3199 }
3200
3201 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3202 {
3203         int idx, err;
3204         int s_idx = cb->args[0];
3205         struct net_device *dev;
3206         struct inet6_dev *idev;
3207
3208         read_lock(&dev_base_lock);
3209         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3210                 if (idx < s_idx)
3211                         continue;
3212                 if ((idev = in6_dev_get(dev)) == NULL)
3213                         continue;
3214                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3215                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3216                 in6_dev_put(idev);
3217                 if (err <= 0)
3218                         break;
3219         }
3220         read_unlock(&dev_base_lock);
3221         cb->args[0] = idx;
3222
3223         return skb->len;
3224 }
3225
3226 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3227 {
3228         struct sk_buff *skb;
3229         /* 128 bytes ?? */
3230         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3231
3232         skb = alloc_skb(size, GFP_ATOMIC);
3233         if (!skb) {
3234                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3235                 return;
3236         }
3237         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3238                 kfree_skb(skb);
3239                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3240                 return;
3241         }
3242         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3243         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3244 }
3245
3246 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3247                         struct prefix_info *pinfo, u32 pid, u32 seq,
3248                         int event, unsigned int flags)
3249 {
3250         struct prefixmsg        *pmsg;
3251         struct nlmsghdr         *nlh;
3252         unsigned char           *b = skb->tail;
3253         struct prefix_cacheinfo ci;
3254
3255         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3256         pmsg = NLMSG_DATA(nlh);
3257         pmsg->prefix_family = AF_INET6;
3258         pmsg->prefix_pad1 = 0;
3259         pmsg->prefix_pad2 = 0;
3260         pmsg->prefix_ifindex = idev->dev->ifindex;
3261         pmsg->prefix_len = pinfo->prefix_len;
3262         pmsg->prefix_type = pinfo->type;
3263         pmsg->prefix_pad3 = 0;
3264
3265         pmsg->prefix_flags = 0;
3266         if (pinfo->onlink)
3267                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3268         if (pinfo->autoconf)
3269                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3270
3271         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3272
3273         ci.preferred_time = ntohl(pinfo->prefered);
3274         ci.valid_time = ntohl(pinfo->valid);
3275         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3276
3277         nlh->nlmsg_len = skb->tail - b;
3278         return skb->len;
3279
3280 nlmsg_failure:
3281 rtattr_failure:
3282         skb_trim(skb, b - skb->data);
3283         return -1;
3284 }
3285
3286 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3287                          struct prefix_info *pinfo)
3288 {
3289         struct sk_buff *skb;
3290         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3291
3292         skb = alloc_skb(size, GFP_ATOMIC);
3293         if (!skb) {
3294                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3295                 return;
3296         }
3297         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3298                 kfree_skb(skb);
3299                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3300                 return;
3301         }
3302         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3303         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3304 }
3305
3306 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3307         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3308         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3309         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3310         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3311         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3312         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3313         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3314         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3315         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3316                                       .dumpit   = inet6_dump_fib, },
3317 };
3318
3319 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3320 {
3321         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3322
3323         switch (event) {
3324         case RTM_NEWADDR:
3325                 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3326                 if (ifp->idev->cnf.forwarding)
3327                         addrconf_join_anycast(ifp);
3328                 break;
3329         case RTM_DELADDR:
3330                 if (ifp->idev->cnf.forwarding)
3331                         addrconf_leave_anycast(ifp);
3332                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3333                 dst_hold(&ifp->rt->u.dst);
3334                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3335                         dst_free(&ifp->rt->u.dst);
3336                 break;
3337         }
3338 }
3339
3340 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3341 {
3342         read_lock_bh(&addrconf_lock);
3343         if (likely(ifp->idev->dead == 0))
3344                 __ipv6_ifa_notify(event, ifp);
3345         read_unlock_bh(&addrconf_lock);
3346 }
3347
3348 #ifdef CONFIG_SYSCTL
3349
3350 static
3351 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3352                            void __user *buffer, size_t *lenp, loff_t *ppos)
3353 {
3354         int *valp = ctl->data;
3355         int val = *valp;
3356         int ret;
3357
3358         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3359
3360         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3361                 if (valp != &ipv6_devconf.forwarding) {
3362                         if ((!*valp) ^ (!val)) {
3363                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3364                                 if (idev == NULL)
3365                                         return ret;
3366                                 dev_forward_change(idev);
3367                         }
3368                 } else {
3369                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3370                         addrconf_forward_change();
3371                 }
3372                 if (*valp)
3373                         rt6_purge_dflt_routers();
3374         }
3375
3376         return ret;
3377 }
3378
3379 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3380                                             int __user *name, int nlen,
3381                                             void __user *oldval,
3382                                             size_t __user *oldlenp,
3383                                             void __user *newval, size_t newlen,
3384                                             void **context)
3385 {
3386         int *valp = table->data;
3387         int new;
3388
3389         if (!newval || !newlen)
3390                 return 0;
3391         if (newlen != sizeof(int))
3392                 return -EINVAL;
3393         if (get_user(new, (int __user *)newval))
3394                 return -EFAULT;
3395         if (new == *valp)
3396                 return 0;
3397         if (oldval && oldlenp) {
3398                 size_t len;
3399                 if (get_user(len, oldlenp))
3400                         return -EFAULT;
3401                 if (len) {
3402                         if (len > table->maxlen)
3403                                 len = table->maxlen;
3404                         if (copy_to_user(oldval, valp, len))
3405                                 return -EFAULT;
3406                         if (put_user(len, oldlenp))
3407                                 return -EFAULT;
3408                 }
3409         }
3410
3411         if (valp != &ipv6_devconf_dflt.forwarding) {
3412                 if (valp != &ipv6_devconf.forwarding) {
3413                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3414                         int changed;
3415                         if (unlikely(idev == NULL))
3416                                 return -ENODEV;
3417                         changed = (!*valp) ^ (!new);
3418                         *valp = new;
3419                         if (changed)
3420                                 dev_forward_change(idev);
3421                 } else {
3422                         *valp = new;
3423                         addrconf_forward_change();
3424                 }
3425
3426                 if (*valp)
3427                         rt6_purge_dflt_routers();
3428         } else
3429                 *valp = new;
3430
3431         return 1;
3432 }
3433
3434 static struct addrconf_sysctl_table
3435 {
3436         struct ctl_table_header *sysctl_header;
3437         ctl_table addrconf_vars[__NET_IPV6_MAX];
3438         ctl_table addrconf_dev[2];
3439         ctl_table addrconf_conf_dir[2];
3440         ctl_table addrconf_proto_dir[2];
3441         ctl_table addrconf_root_dir[2];
3442 } addrconf_sysctl = {
3443         .sysctl_header = NULL,
3444         .addrconf_vars = {
3445                 {
3446                         .ctl_name       =       NET_IPV6_FORWARDING,
3447                         .procname       =       "forwarding",
3448                         .data           =       &ipv6_devconf.forwarding,
3449                         .maxlen         =       sizeof(int),
3450                         .mode           =       0644,
3451                         .proc_handler   =       &addrconf_sysctl_forward,
3452                         .strategy       =       &addrconf_sysctl_forward_strategy,
3453                 },
3454                 {
3455                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3456                         .procname       =       "hop_limit",
3457                         .data           =       &ipv6_devconf.hop_limit,
3458                         .maxlen         =       sizeof(int),
3459                         .mode           =       0644,
3460                         .proc_handler   =       proc_dointvec,
3461                 },
3462                 {
3463                         .ctl_name       =       NET_IPV6_MTU,
3464                         .procname       =       "mtu",
3465                         .data           =       &ipv6_devconf.mtu6,
3466                         .maxlen         =       sizeof(int),
3467                         .mode           =       0644,
3468                         .proc_handler   =       &proc_dointvec,
3469                 },
3470                 {
3471                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3472                         .procname       =       "accept_ra",
3473                         .data           =       &ipv6_devconf.accept_ra,
3474                         .maxlen         =       sizeof(int),
3475                         .mode           =       0644,
3476                         .proc_handler   =       &proc_dointvec,
3477                 },
3478                 {
3479                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3480                         .procname       =       "accept_redirects",
3481                         .data           =       &ipv6_devconf.accept_redirects,
3482                         .maxlen         =       sizeof(int),
3483                         .mode           =       0644,
3484                         .proc_handler   =       &proc_dointvec,
3485                 },
3486                 {
3487                         .ctl_name       =       NET_IPV6_AUTOCONF,
3488                         .procname       =       "autoconf",
3489                         .data           =       &ipv6_devconf.autoconf,
3490                         .maxlen         =       sizeof(int),
3491                         .mode           =       0644,
3492                         .proc_handler   =       &proc_dointvec,
3493                 },
3494                 {
3495                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3496                         .procname       =       "dad_transmits",
3497                         .data           =       &ipv6_devconf.dad_transmits,
3498                         .maxlen         =       sizeof(int),
3499                         .mode           =       0644,
3500                         .proc_handler   =       &proc_dointvec,
3501                 },
3502                 {
3503                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3504                         .procname       =       "router_solicitations",
3505                         .data           =       &ipv6_devconf.rtr_solicits,
3506                         .maxlen         =       sizeof(int),
3507                         .mode           =       0644,
3508                         .proc_handler   =       &proc_dointvec,
3509                 },
3510                 {
3511                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3512                         .procname       =       "router_solicitation_interval",
3513                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3514                         .maxlen         =       sizeof(int),
3515                         .mode           =       0644,
3516                         .proc_handler   =       &proc_dointvec_jiffies,
3517                         .strategy       =       &sysctl_jiffies,
3518                 },
3519                 {
3520                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3521                         .procname       =       "router_solicitation_delay",
3522                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3523                         .maxlen         =       sizeof(int),
3524                         .mode           =       0644,
3525                         .proc_handler   =       &proc_dointvec_jiffies,
3526                         .strategy       =       &sysctl_jiffies,
3527                 },
3528                 {
3529                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3530                         .procname       =       "force_mld_version",
3531                         .data           =       &ipv6_devconf.force_mld_version,
3532                         .maxlen         =       sizeof(int),
3533                         .mode           =       0644,
3534                         .proc_handler   =       &proc_dointvec,
3535                 },
3536 #ifdef CONFIG_IPV6_PRIVACY
3537                 {
3538                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3539                         .procname       =       "use_tempaddr",
3540                         .data           =       &ipv6_devconf.use_tempaddr,
3541                         .maxlen         =       sizeof(int),
3542                         .mode           =       0644,
3543                         .proc_handler   =       &proc_dointvec,
3544                 },
3545                 {
3546                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3547                         .procname       =       "temp_valid_lft",
3548                         .data           =       &ipv6_devconf.temp_valid_lft,
3549                         .maxlen         =       sizeof(int),
3550                         .mode           =       0644,
3551                         .proc_handler   =       &proc_dointvec,
3552                 },
3553                 {
3554                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3555                         .procname       =       "temp_prefered_lft",
3556                         .data           =       &ipv6_devconf.temp_prefered_lft,
3557                         .maxlen         =       sizeof(int),
3558                         .mode           =       0644,
3559                         .proc_handler   =       &proc_dointvec,
3560                 },
3561                 {
3562                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3563                         .procname       =       "regen_max_retry",
3564                         .data           =       &ipv6_devconf.regen_max_retry,
3565                         .maxlen         =       sizeof(int),
3566                         .mode           =       0644,
3567                         .proc_handler   =       &proc_dointvec,
3568                 },
3569                 {
3570                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3571                         .procname       =       "max_desync_factor",
3572                         .data           =       &ipv6_devconf.max_desync_factor,
3573                         .maxlen         =       sizeof(int),
3574                         .mode           =       0644,
3575                         .proc_handler   =       &proc_dointvec,
3576                 },
3577 #endif
3578                 {
3579                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3580                         .procname       =       "max_addresses",
3581                         .data           =       &ipv6_devconf.max_addresses,
3582                         .maxlen         =       sizeof(int),
3583                         .mode           =       0644,
3584                         .proc_handler   =       &proc_dointvec,
3585                 },
3586                 {
3587                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3588                         .procname       =       "accept_ra_defrtr",
3589                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3590                         .maxlen         =       sizeof(int),
3591                         .mode           =       0644,
3592                         .proc_handler   =       &proc_dointvec,
3593                 },
3594                 {
3595                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3596                         .procname       =       "accept_ra_pinfo",
3597                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3598                         .maxlen         =       sizeof(int),
3599                         .mode           =       0644,
3600                         .proc_handler   =       &proc_dointvec,
3601                 },
3602 #ifdef CONFIG_IPV6_ROUTER_PREF
3603                 {
3604                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3605                         .procname       =       "accept_ra_rtr_pref",
3606                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3607                         .maxlen         =       sizeof(int),
3608                         .mode           =       0644,
3609                         .proc_handler   =       &proc_dointvec,
3610                 },
3611 #endif
3612                 {
3613                         .ctl_name       =       0,      /* sentinel */
3614                 }
3615         },
3616         .addrconf_dev = {
3617                 {
3618                         .ctl_name       =       NET_PROTO_CONF_ALL,
3619                         .procname       =       "all",
3620                         .mode           =       0555,
3621                         .child          =       addrconf_sysctl.addrconf_vars,
3622                 },
3623                 {
3624                         .ctl_name       =       0,      /* sentinel */
3625                 }
3626         },
3627         .addrconf_conf_dir = {
3628                 {
3629                         .ctl_name       =       NET_IPV6_CONF,
3630                         .procname       =       "conf",
3631                         .mode           =       0555,
3632                         .child          =       addrconf_sysctl.addrconf_dev,
3633                 },
3634                 {
3635                         .ctl_name       =       0,      /* sentinel */
3636                 }
3637         },
3638         .addrconf_proto_dir = {
3639                 {
3640                         .ctl_name       =       NET_IPV6,
3641                         .procname       =       "ipv6",
3642                         .mode           =       0555,
3643                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3644                 },
3645                 {
3646                         .ctl_name       =       0,      /* sentinel */
3647                 }
3648         },
3649         .addrconf_root_dir = {
3650                 {
3651                         .ctl_name       =       CTL_NET,
3652                         .procname       =       "net",
3653                         .mode           =       0555,
3654                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3655                 },
3656                 {
3657                         .ctl_name       =       0,      /* sentinel */
3658                 }
3659         },
3660 };
3661
3662 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3663 {
3664         int i;
3665         struct net_device *dev = idev ? idev->dev : NULL;
3666         struct addrconf_sysctl_table *t;
3667         char *dev_name = NULL;
3668
3669         t = kmalloc(sizeof(*t), GFP_KERNEL);
3670         if (t == NULL)
3671                 return;
3672         memcpy(t, &addrconf_sysctl, sizeof(*t));
3673         for (i=0; t->addrconf_vars[i].data; i++) {
3674                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3675                 t->addrconf_vars[i].de = NULL;
3676                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3677         }
3678         if (dev) {
3679                 dev_name = dev->name;
3680                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3681         } else {
3682                 dev_name = "default";
3683                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3684         }
3685
3686         /*
3687          * Make a copy of dev_name, because '.procname' is regarded as const
3688          * by sysctl and we wouldn't want anyone to change it under our feet
3689          * (see SIOCSIFNAME).
3690          */
3691         dev_name = kstrdup(dev_name, GFP_KERNEL);
3692         if (!dev_name)
3693             goto free;
3694
3695         t->addrconf_dev[0].procname = dev_name;
3696
3697         t->addrconf_dev[0].child = t->addrconf_vars;
3698         t->addrconf_dev[0].de = NULL;
3699         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3700         t->addrconf_conf_dir[0].de = NULL;
3701         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3702         t->addrconf_proto_dir[0].de = NULL;
3703         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3704         t->addrconf_root_dir[0].de = NULL;
3705
3706         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3707         if (t->sysctl_header == NULL)
3708                 goto free_procname;
3709         else
3710                 p->sysctl = t;
3711         return;
3712
3713         /* error path */
3714  free_procname:
3715         kfree(dev_name);
3716  free:
3717         kfree(t);
3718
3719         return;
3720 }
3721
3722 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3723 {
3724         if (p->sysctl) {
3725                 struct addrconf_sysctl_table *t = p->sysctl;
3726                 p->sysctl = NULL;
3727                 unregister_sysctl_table(t->sysctl_header);
3728                 kfree(t->addrconf_dev[0].procname);
3729                 kfree(t);
3730         }
3731 }
3732
3733
3734 #endif
3735
3736 /*
3737  *      Device notifier
3738  */
3739
3740 int register_inet6addr_notifier(struct notifier_block *nb)
3741 {
3742         return notifier_chain_register(&inet6addr_chain, nb);
3743 }
3744
3745 int unregister_inet6addr_notifier(struct notifier_block *nb)
3746 {
3747         return notifier_chain_unregister(&inet6addr_chain,nb);
3748 }
3749
3750 /*
3751  *      Init / cleanup code
3752  */
3753
3754 int __init addrconf_init(void)
3755 {
3756         int err = 0;
3757
3758         /* The addrconf netdev notifier requires that loopback_dev
3759          * has it's ipv6 private information allocated and setup
3760          * before it can bring up and give link-local addresses
3761          * to other devices which are up.
3762          *
3763          * Unfortunately, loopback_dev is not necessarily the first
3764          * entry in the global dev_base list of net devices.  In fact,
3765          * it is likely to be the very last entry on that list.
3766          * So this causes the notifier registry below to try and
3767          * give link-local addresses to all devices besides loopback_dev
3768          * first, then loopback_dev, which cases all the non-loopback_dev
3769          * devices to fail to get a link-local address.
3770          *
3771          * So, as a temporary fix, allocate the ipv6 structure for
3772          * loopback_dev first by hand.
3773          * Longer term, all of the dependencies ipv6 has upon the loopback
3774          * device and it being up should be removed.
3775          */
3776         rtnl_lock();
3777         if (!ipv6_add_dev(&loopback_dev))
3778                 err = -ENOMEM;
3779         rtnl_unlock();
3780         if (err)
3781                 return err;
3782
3783         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3784
3785         register_netdevice_notifier(&ipv6_dev_notf);
3786
3787         addrconf_verify(0);
3788         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3789 #ifdef CONFIG_SYSCTL
3790         addrconf_sysctl.sysctl_header =
3791                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3792         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3793 #endif
3794
3795         return 0;
3796 }
3797
3798 void __exit addrconf_cleanup(void)
3799 {
3800         struct net_device *dev;
3801         struct inet6_dev *idev;
3802         struct inet6_ifaddr *ifa;
3803         int i;
3804
3805         unregister_netdevice_notifier(&ipv6_dev_notf);
3806
3807         rtnetlink_links[PF_INET6] = NULL;
3808 #ifdef CONFIG_SYSCTL
3809         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3810         addrconf_sysctl_unregister(&ipv6_devconf);
3811 #endif
3812
3813         rtnl_lock();
3814
3815         /*
3816          *      clean dev list.
3817          */
3818
3819         for (dev=dev_base; dev; dev=dev->next) {
3820                 if ((idev = __in6_dev_get(dev)) == NULL)
3821                         continue;
3822                 addrconf_ifdown(dev, 1);
3823         }
3824         addrconf_ifdown(&loopback_dev, 2);
3825
3826         /*
3827          *      Check hash table.
3828          */
3829
3830         write_lock_bh(&addrconf_hash_lock);
3831         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3832                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3833                         struct inet6_ifaddr *bifa;
3834
3835                         bifa = ifa;
3836                         ifa = ifa->lst_next;
3837                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3838                         /* Do not free it; something is wrong.
3839                            Now we can investigate it with debugger.
3840                          */
3841                 }
3842         }
3843         write_unlock_bh(&addrconf_hash_lock);
3844
3845         del_timer(&addr_chk_timer);
3846
3847         rtnl_unlock();
3848
3849 #ifdef CONFIG_PROC_FS
3850         proc_net_remove("if_inet6");
3851 #endif
3852 }