net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/config.h>
  44 #include <linux/errno.h>
  45 #include <linux/types.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/sched.h>
  49 #include <linux/net.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #ifdef CONFIG_SYSCTL
  59 #include <linux/sysctl.h>
  60 #endif
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/sock.h>
  66 #include <net/snmp.h>
  67
  68 #include <net/ipv6.h>
  69 #include <net/protocol.h>
  70 #include <net/ndisc.h>
  71 #include <net/ip6_route.h>
  72 #include <net/addrconf.h>
  73 #include <net/tcp.h>
  74 #include <net/ip.h>
  75 #include <linux/if_tunnel.h>
  76 #include <linux/rtnetlink.h>
  77
  78 #ifdef CONFIG_IPV6_PRIVACY
  79 #include <linux/random.h>
  80 #include <linux/crypto.h>
  81 #include <linux/scatterlist.h>
  82 #endif
  83
  84 #include <asm/uaccess.h>
  85
  86 #include <linux/proc_fs.h>
  87 #include <linux/seq_file.h>
  88
  89 /* Set to 3 to get tracing... */
  90 #define ACONF_DEBUG 2
  91
  92 #if ACONF_DEBUG >= 3
  93 #define ADBG(x) printk x
  94 #else
  95 #define ADBG(x)
  96 #endif
  97
  98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 100
 101 #ifdef CONFIG_SYSCTL
 102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 104 #endif
 105
 106 #ifdef CONFIG_IPV6_PRIVACY
 107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 109 static void ipv6_regen_rndid(unsigned long data);
 110
 111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 112 static struct crypto_tfm *md5_tfm;
 113 static DEFINE_SPINLOCK(md5_tfm_lock);
 114 #endif
 115
 116 static int ipv6_count_addresses(struct inet6_dev *idev);
 117
 118 /*
 119  *      Configured unicast address hash table
 120  */
 121 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 122 static DEFINE_RWLOCK(addrconf_hash_lock);
 123
 124 /* Protects inet6 devices */
 125 DEFINE_RWLOCK(addrconf_lock);
 126
 127 static void addrconf_verify(unsigned long);
 128
 129 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 130 static DEFINE_SPINLOCK(addrconf_verify_lock);
 131
 132 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 133 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 134
 135 static int addrconf_ifdown(struct net_device *dev, int how);
 136
 137 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 138 static void addrconf_dad_timer(unsigned long data);
 139 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 140 static void addrconf_dad_run(struct inet6_dev *idev);
 141 static void addrconf_rs_timer(unsigned long data);
 142 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 143 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 144
 145 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 146                                 struct prefix_info *pinfo);
 147 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 148
 149 static struct notifier_block *inet6addr_chain;
 150
 151 struct ipv6_devconf ipv6_devconf = {
 152         .forwarding             = 0,
 153         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 154         .mtu6                   = IPV6_MIN_MTU,
 155         .accept_ra              = 1,
 156         .accept_redirects       = 1,
 157         .autoconf               = 1,
 158         .force_mld_version      = 0,
 159         .dad_transmits          = 1,
 160         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 161         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 162         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 163 #ifdef CONFIG_IPV6_PRIVACY
 164         .use_tempaddr           = 0,
 165         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 166         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 167         .regen_max_retry        = REGEN_MAX_RETRY,
 168         .max_desync_factor      = MAX_DESYNC_FACTOR,
 169 #endif
 170         .max_addresses          = IPV6_MAX_ADDRESSES,
 171 };
 172
 173 static struct ipv6_devconf ipv6_devconf_dflt = {
 174         .forwarding             = 0,
 175         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 176         .mtu6                   = IPV6_MIN_MTU,
 177         .accept_ra              = 1,
 178         .accept_redirects       = 1,
 179         .autoconf               = 1,
 180         .dad_transmits          = 1,
 181         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 182         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 183         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 184 #ifdef CONFIG_IPV6_PRIVACY
 185         .use_tempaddr           = 0,
 186         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 187         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 188         .regen_max_retry        = REGEN_MAX_RETRY,
 189         .max_desync_factor      = MAX_DESYNC_FACTOR,
 190 #endif
 191         .max_addresses          = IPV6_MAX_ADDRESSES,
 192 };
 193
 194 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 195 #if 0
 196 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 197 #endif
 198 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 199
 200 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 201
 202 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 203 {
 204         switch(scope) {
 205         case IPV6_ADDR_SCOPE_NODELOCAL:
 206                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 207                         IPV6_ADDR_LOOPBACK);
 208         case IPV6_ADDR_SCOPE_LINKLOCAL:
 209                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 210                         IPV6_ADDR_LINKLOCAL);
 211         case IPV6_ADDR_SCOPE_SITELOCAL:
 212                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 213                         IPV6_ADDR_SITELOCAL);
 214         }
 215         return IPV6_ADDR_SCOPE_TYPE(scope);
 216 }
 217
 218 int __ipv6_addr_type(const struct in6_addr *addr)
 219 {
 220         u32 st;
 221
 222         st = addr->s6_addr32[0];
 223
 224         /* Consider all addresses with the first three bits different of
 225            000 and 111 as unicasts.
 226          */
 227         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 228             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 229                 return (IPV6_ADDR_UNICAST |
 230                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 231
 232         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 233                 /* multicast */
 234                 /* addr-select 3.1 */
 235                 return (IPV6_ADDR_MULTICAST |
 236                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 237         }
 238
 239         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 240                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 241                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 242         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 243                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 244                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 245
 246         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 247                 if (addr->s6_addr32[2] == 0) {
 248                         if (addr->s6_addr32[3] == 0)
 249                                 return IPV6_ADDR_ANY;
 250
 251                         if (addr->s6_addr32[3] == htonl(0x00000001))
 252                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 253                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 254
 255                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 256                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 257                 }
 258
 259                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 260                         return (IPV6_ADDR_MAPPED |
 261                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 262         }
 263
 264         return (IPV6_ADDR_RESERVED |
 265                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 266 }
 267
 268 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 269 {
 270         if (del_timer(&ifp->timer))
 271                 __in6_ifa_put(ifp);
 272 }
 273
 274 enum addrconf_timer_t
 275 {
 276         AC_NONE,
 277         AC_DAD,
 278         AC_RS,
 279 };
 280
 281 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 282                                enum addrconf_timer_t what,
 283                                unsigned long when)
 284 {
 285         if (!del_timer(&ifp->timer))
 286                 in6_ifa_hold(ifp);
 287
 288         switch (what) {
 289         case AC_DAD:
 290                 ifp->timer.function = addrconf_dad_timer;
 291                 break;
 292         case AC_RS:
 293                 ifp->timer.function = addrconf_rs_timer;
 294                 break;
 295         default:;
 296         }
 297         ifp->timer.expires = jiffies + when;
 298         add_timer(&ifp->timer);
 299 }
 300
 301 /* Nobody refers to this device, we may destroy it. */
 302
 303 void in6_dev_finish_destroy(struct inet6_dev *idev)
 304 {
 305         struct net_device *dev = idev->dev;
 306         BUG_TRAP(idev->addr_list==NULL);
 307         BUG_TRAP(idev->mc_list==NULL);
 308 #ifdef NET_REFCNT_DEBUG
 309         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 310 #endif
 311         dev_put(dev);
 312         if (!idev->dead) {
 313                 printk("Freeing alive inet6 device %p\n", idev);
 314                 return;
 315         }
 316         snmp6_free_dev(idev);
 317         kfree(idev);
 318 }
 319
 320 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 321 {
 322         struct inet6_dev *ndev;
 323
 324         ASSERT_RTNL();
 325
 326         if (dev->mtu < IPV6_MIN_MTU)
 327                 return NULL;
 328
 329         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 330
 331         if (ndev) {
 332                 memset(ndev, 0, sizeof(struct inet6_dev));
 333
 334                 rwlock_init(&ndev->lock);
 335                 ndev->dev = dev;
 336                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 337                 ndev->cnf.mtu6 = dev->mtu;
 338                 ndev->cnf.sysctl = NULL;
 339                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 340                 if (ndev->nd_parms == NULL) {
 341                         kfree(ndev);
 342                         return NULL;
 343                 }
 344                 /* We refer to the device */
 345                 dev_hold(dev);
 346
 347                 if (snmp6_alloc_dev(ndev) < 0) {
 348                         ADBG((KERN_WARNING
 349                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
 350                                 __FUNCTION__, dev->name));
 351                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 352                         ndev->dead = 1;
 353                         in6_dev_finish_destroy(ndev);
 354                         return NULL;
 355                 }
 356
 357                 if (snmp6_register_dev(ndev) < 0) {
 358                         ADBG((KERN_WARNING
 359                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 360                                 __FUNCTION__, dev->name));
 361                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 362                         ndev->dead = 1;
 363                         in6_dev_finish_destroy(ndev);
 364                         return NULL;
 365                 }
 366
 367                 /* One reference from device.  We must do this before
 368                  * we invoke __ipv6_regen_rndid().
 369                  */
 370                 in6_dev_hold(ndev);
 371
 372 #ifdef CONFIG_IPV6_PRIVACY
 373                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
 374                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
 375                 init_timer(&ndev->regen_timer);
 376                 ndev->regen_timer.function = ipv6_regen_rndid;
 377                 ndev->regen_timer.data = (unsigned long) ndev;
 378                 if ((dev->flags&IFF_LOOPBACK) ||
 379                     dev->type == ARPHRD_TUNNEL ||
 380                     dev->type == ARPHRD_NONE ||
 381                     dev->type == ARPHRD_SIT) {
 382                         printk(KERN_INFO
 383                                "%s: Disabled Privacy Extensions\n",
 384                                dev->name);
 385                         ndev->cnf.use_tempaddr = -1;
 386                 } else {
 387                         in6_dev_hold(ndev);
 388                         ipv6_regen_rndid((unsigned long) ndev);
 389                 }
 390 #endif
 391
 392                 if (netif_carrier_ok(dev))
 393                         ndev->if_flags |= IF_READY;
 394
 395                 write_lock_bh(&addrconf_lock);
 396                 dev->ip6_ptr = ndev;
 397                 write_unlock_bh(&addrconf_lock);
 398
 399                 ipv6_mc_init_dev(ndev);
 400                 ndev->tstamp = jiffies;
 401 #ifdef CONFIG_SYSCTL
 402                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 403                                       NET_IPV6_NEIGH, "ipv6",
 404                                       &ndisc_ifinfo_sysctl_change,
 405                                       NULL);
 406                 addrconf_sysctl_register(ndev, &ndev->cnf);
 407 #endif
 408         }
 409         return ndev;
 410 }
 411
 412 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 413 {
 414         struct inet6_dev *idev;
 415
 416         ASSERT_RTNL();
 417
 418         if ((idev = __in6_dev_get(dev)) == NULL) {
 419                 if ((idev = ipv6_add_dev(dev)) == NULL)
 420                         return NULL;
 421         }
 422
 423         if (dev->flags&IFF_UP)
 424                 ipv6_mc_up(idev);
 425         return idev;
 426 }
 427
 428 #ifdef CONFIG_SYSCTL
 429 static void dev_forward_change(struct inet6_dev *idev)
 430 {
 431         struct net_device *dev;
 432         struct inet6_ifaddr *ifa;
 433         struct in6_addr addr;
 434
 435         if (!idev)
 436                 return;
 437         dev = idev->dev;
 438         if (dev && (dev->flags & IFF_MULTICAST)) {
 439                 ipv6_addr_all_routers(&addr);
 440
 441                 if (idev->cnf.forwarding)
 442                         ipv6_dev_mc_inc(dev, &addr);
 443                 else
 444                         ipv6_dev_mc_dec(dev, &addr);
 445         }
 446         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 447                 if (idev->cnf.forwarding)
 448                         addrconf_join_anycast(ifa);
 449                 else
 450                         addrconf_leave_anycast(ifa);
 451         }
 452 }
 453
 454
 455 static void addrconf_forward_change(void)
 456 {
 457         struct net_device *dev;
 458         struct inet6_dev *idev;
 459
 460         read_lock(&dev_base_lock);
 461         for (dev=dev_base; dev; dev=dev->next) {
 462                 read_lock(&addrconf_lock);
 463                 idev = __in6_dev_get(dev);
 464                 if (idev) {
 465                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 466                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 467                         if (changed)
 468                                 dev_forward_change(idev);
 469                 }
 470                 read_unlock(&addrconf_lock);
 471         }
 472         read_unlock(&dev_base_lock);
 473 }
 474 #endif
 475
 476 /* Nobody refers to this ifaddr, destroy it */
 477
 478 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 479 {
 480         BUG_TRAP(ifp->if_next==NULL);
 481         BUG_TRAP(ifp->lst_next==NULL);
 482 #ifdef NET_REFCNT_DEBUG
 483         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 484 #endif
 485
 486         in6_dev_put(ifp->idev);
 487
 488         if (del_timer(&ifp->timer))
 489                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 490
 491         if (!ifp->dead) {
 492                 printk("Freeing alive inet6 address %p\n", ifp);
 493                 return;
 494         }
 495         dst_release(&ifp->rt->u.dst);
 496
 497         kfree(ifp);
 498 }
 499
 500 /* On success it returns ifp with increased reference count */
 501
 502 static struct inet6_ifaddr *
 503 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 504               int scope, u32 flags)
 505 {
 506         struct inet6_ifaddr *ifa = NULL;
 507         struct rt6_info *rt;
 508         int hash;
 509         int err = 0;
 510
 511         read_lock_bh(&addrconf_lock);
 512         if (idev->dead) {
 513                 err = -ENODEV;                  /*XXX*/
 514                 goto out2;
 515         }
 516
 517         write_lock(&addrconf_hash_lock);
 518
 519         /* Ignore adding duplicate addresses on an interface */
 520         if (ipv6_chk_same_addr(addr, idev->dev)) {
 521                 ADBG(("ipv6_add_addr: already assigned\n"));
 522                 err = -EEXIST;
 523                 goto out;
 524         }
 525
 526         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 527
 528         if (ifa == NULL) {
 529                 ADBG(("ipv6_add_addr: malloc failed\n"));
 530                 err = -ENOBUFS;
 531                 goto out;
 532         }
 533
 534         rt = addrconf_dst_alloc(idev, addr, 0);
 535         if (IS_ERR(rt)) {
 536                 err = PTR_ERR(rt);
 537                 goto out;
 538         }
 539
 540         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 541         ipv6_addr_copy(&ifa->addr, addr);
 542
 543         spin_lock_init(&ifa->lock);
 544         init_timer(&ifa->timer);
 545         ifa->timer.data = (unsigned long) ifa;
 546         ifa->scope = scope;
 547         ifa->prefix_len = pfxlen;
 548         ifa->flags = flags | IFA_F_TENTATIVE;
 549         ifa->cstamp = ifa->tstamp = jiffies;
 550
 551         ifa->idev = idev;
 552         in6_dev_hold(idev);
 553         /* For caller */
 554         in6_ifa_hold(ifa);
 555
 556         /* Add to big hash table */
 557         hash = ipv6_addr_hash(addr);
 558
 559         ifa->lst_next = inet6_addr_lst[hash];
 560         inet6_addr_lst[hash] = ifa;
 561         in6_ifa_hold(ifa);
 562         write_unlock(&addrconf_hash_lock);
 563
 564         write_lock(&idev->lock);
 565         /* Add to inet6_dev unicast addr list. */
 566         ifa->if_next = idev->addr_list;
 567         idev->addr_list = ifa;
 568
 569 #ifdef CONFIG_IPV6_PRIVACY
 570         if (ifa->flags&IFA_F_TEMPORARY) {
 571                 ifa->tmp_next = idev->tempaddr_list;
 572                 idev->tempaddr_list = ifa;
 573                 in6_ifa_hold(ifa);
 574         }
 575 #endif
 576
 577         ifa->rt = rt;
 578
 579         in6_ifa_hold(ifa);
 580         write_unlock(&idev->lock);
 581 out2:
 582         read_unlock_bh(&addrconf_lock);
 583
 584         if (likely(err == 0))
 585                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 586         else {
 587                 kfree(ifa);
 588                 ifa = ERR_PTR(err);
 589         }
 590
 591         return ifa;
 592 out:
 593         write_unlock(&addrconf_hash_lock);
 594         goto out2;
 595 }
 596
 597 /* This function wants to get referenced ifp and releases it before return */
 598
 599 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 600 {
 601         struct inet6_ifaddr *ifa, **ifap;
 602         struct inet6_dev *idev = ifp->idev;
 603         int hash;
 604         int deleted = 0, onlink = 0;
 605         unsigned long expires = jiffies;
 606
 607         hash = ipv6_addr_hash(&ifp->addr);
 608
 609         ifp->dead = 1;
 610
 611         write_lock_bh(&addrconf_hash_lock);
 612         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 613              ifap = &ifa->lst_next) {
 614                 if (ifa == ifp) {
 615                         *ifap = ifa->lst_next;
 616                         __in6_ifa_put(ifp);
 617                         ifa->lst_next = NULL;
 618                         break;
 619                 }
 620         }
 621         write_unlock_bh(&addrconf_hash_lock);
 622
 623         write_lock_bh(&idev->lock);
 624 #ifdef CONFIG_IPV6_PRIVACY
 625         if (ifp->flags&IFA_F_TEMPORARY) {
 626                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 627                      ifap = &ifa->tmp_next) {
 628                         if (ifa == ifp) {
 629                                 *ifap = ifa->tmp_next;
 630                                 if (ifp->ifpub) {
 631                                         in6_ifa_put(ifp->ifpub);
 632                                         ifp->ifpub = NULL;
 633                                 }
 634                                 __in6_ifa_put(ifp);
 635                                 ifa->tmp_next = NULL;
 636                                 break;
 637                         }
 638                 }
 639         }
 640 #endif
 641
 642         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 643                 if (ifa == ifp) {
 644                         *ifap = ifa->if_next;
 645                         __in6_ifa_put(ifp);
 646                         ifa->if_next = NULL;
 647                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 648                                 break;
 649                         deleted = 1;
 650                         continue;
 651                 } else if (ifp->flags & IFA_F_PERMANENT) {
 652                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 653                                               ifp->prefix_len)) {
 654                                 if (ifa->flags & IFA_F_PERMANENT) {
 655                                         onlink = 1;
 656                                         if (deleted)
 657                                                 break;
 658                                 } else {
 659                                         unsigned long lifetime;
 660
 661                                         if (!onlink)
 662                                                 onlink = -1;
 663
 664                                         spin_lock(&ifa->lock);
 665                                         lifetime = min_t(unsigned long,
 666                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 667                                         if (time_before(expires,
 668                                                         ifa->tstamp + lifetime * HZ))
 669                                                 expires = ifa->tstamp + lifetime * HZ;
 670                                         spin_unlock(&ifa->lock);
 671                                 }
 672                         }
 673                 }
 674                 ifap = &ifa->if_next;
 675         }
 676         write_unlock_bh(&idev->lock);
 677
 678         ipv6_ifa_notify(RTM_DELADDR, ifp);
 679
 680         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 681
 682         addrconf_del_timer(ifp);
 683
 684         /*
 685          * Purge or update corresponding prefix
 686          *
 687          * 1) we don't purge prefix here if address was not permanent.
 688          *    prefix is managed by its own lifetime.
 689          * 2) if there're no addresses, delete prefix.
 690          * 3) if there're still other permanent address(es),
 691          *    corresponding prefix is still permanent.
 692          * 4) otherwise, update prefix lifetime to the
 693          *    longest valid lifetime among the corresponding
 694          *    addresses on the device.
 695          *    Note: subsequent RA will update lifetime.
 696          *
 697          * --yoshfuji
 698          */
 699         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 700                 struct in6_addr prefix;
 701                 struct rt6_info *rt;
 702
 703                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 704                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 705
 706                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 707                         if (onlink == 0) {
 708                                 ip6_del_rt(rt, NULL, NULL, NULL);
 709                                 rt = NULL;
 710                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 711                                 rt->rt6i_expires = expires;
 712                                 rt->rt6i_flags |= RTF_EXPIRES;
 713                         }
 714                 }
 715                 dst_release(&rt->u.dst);
 716         }
 717
 718         in6_ifa_put(ifp);
 719 }
 720
 721 #ifdef CONFIG_IPV6_PRIVACY
 722 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 723 {
 724         struct inet6_dev *idev = ifp->idev;
 725         struct in6_addr addr, *tmpaddr;
 726         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 727         int tmp_plen;
 728         int ret = 0;
 729         int max_addresses;
 730
 731         write_lock(&idev->lock);
 732         if (ift) {
 733                 spin_lock_bh(&ift->lock);
 734                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 735                 spin_unlock_bh(&ift->lock);
 736                 tmpaddr = &addr;
 737         } else {
 738                 tmpaddr = NULL;
 739         }
 740 retry:
 741         in6_dev_hold(idev);
 742         if (idev->cnf.use_tempaddr <= 0) {
 743                 write_unlock(&idev->lock);
 744                 printk(KERN_INFO
 745                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 746                 in6_dev_put(idev);
 747                 ret = -1;
 748                 goto out;
 749         }
 750         spin_lock_bh(&ifp->lock);
 751         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 752                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 753                 spin_unlock_bh(&ifp->lock);
 754                 write_unlock(&idev->lock);
 755                 printk(KERN_WARNING
 756                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 757                 in6_dev_put(idev);
 758                 ret = -1;
 759                 goto out;
 760         }
 761         in6_ifa_hold(ifp);
 762         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 763         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 764                 spin_unlock_bh(&ifp->lock);
 765                 write_unlock(&idev->lock);
 766                 printk(KERN_WARNING
 767                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 768                 in6_ifa_put(ifp);
 769                 in6_dev_put(idev);
 770                 ret = -1;
 771                 goto out;
 772         }
 773         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 774         tmp_valid_lft = min_t(__u32,
 775                               ifp->valid_lft,
 776                               idev->cnf.temp_valid_lft);
 777         tmp_prefered_lft = min_t(__u32,
 778                                  ifp->prefered_lft,
 779                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 780         tmp_plen = ifp->prefix_len;
 781         max_addresses = idev->cnf.max_addresses;
 782         tmp_cstamp = ifp->cstamp;
 783         tmp_tstamp = ifp->tstamp;
 784         spin_unlock_bh(&ifp->lock);
 785
 786         write_unlock(&idev->lock);
 787         ift = !max_addresses ||
 788               ipv6_count_addresses(idev) < max_addresses ?
 789                 ipv6_add_addr(idev, &addr, tmp_plen,
 790                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 791         if (!ift || IS_ERR(ift)) {
 792                 in6_ifa_put(ifp);
 793                 in6_dev_put(idev);
 794                 printk(KERN_INFO
 795                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 796                 tmpaddr = &addr;
 797                 write_lock(&idev->lock);
 798                 goto retry;
 799         }
 800
 801         spin_lock_bh(&ift->lock);
 802         ift->ifpub = ifp;
 803         ift->valid_lft = tmp_valid_lft;
 804         ift->prefered_lft = tmp_prefered_lft;
 805         ift->cstamp = tmp_cstamp;
 806         ift->tstamp = tmp_tstamp;
 807         spin_unlock_bh(&ift->lock);
 808
 809         addrconf_dad_start(ift, 0);
 810         in6_ifa_put(ift);
 811         in6_dev_put(idev);
 812 out:
 813         return ret;
 814 }
 815 #endif
 816
 817 /*
 818  *      Choose an appropriate source address (RFC3484)
 819  */
 820 struct ipv6_saddr_score {
 821         int             addr_type;
 822         unsigned int    attrs;
 823         int             matchlen;
 824         unsigned int    scope;
 825         unsigned int    rule;
 826 };
 827
 828 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 829 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 830 #define IPV6_SADDR_SCORE_HOA            0x0008
 831 #define IPV6_SADDR_SCORE_OIF            0x0010
 832 #define IPV6_SADDR_SCORE_LABEL          0x0020
 833 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 834
 835 static int inline ipv6_saddr_preferred(int type)
 836 {
 837         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 838                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 839                 return 1;
 840         return 0;
 841 }
 842
 843 /* static matching label */
 844 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 845 {
 846  /*
 847   *     prefix (longest match)  label
 848   *     -----------------------------
 849   *     ::1/128                 0
 850   *     ::/0                    1
 851   *     2002::/16               2
 852   *     ::/96                   3
 853   *     ::ffff:0:0/96           4
 854   */
 855         if (type & IPV6_ADDR_LOOPBACK)
 856                 return 0;
 857         else if (type & IPV6_ADDR_COMPATv4)
 858                 return 3;
 859         else if (type & IPV6_ADDR_MAPPED)
 860                 return 4;
 861         else if (addr->s6_addr16[0] == htons(0x2002))
 862                 return 2;
 863         return 1;
 864 }
 865
 866 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 867                        struct in6_addr *daddr, struct in6_addr *saddr)
 868 {
 869         struct ipv6_saddr_score hiscore;
 870         struct inet6_ifaddr *ifa_result = NULL;
 871         int daddr_type = __ipv6_addr_type(daddr);
 872         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 873         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 874         struct net_device *dev;
 875
 876         memset(&hiscore, 0, sizeof(hiscore));
 877
 878         read_lock(&dev_base_lock);
 879         read_lock(&addrconf_lock);
 880
 881         for (dev = dev_base; dev; dev=dev->next) {
 882                 struct inet6_dev *idev;
 883                 struct inet6_ifaddr *ifa;
 884
 885                 /* Rule 0: Candidate Source Address (section 4)
 886                  *  - multicast and link-local destination address,
 887                  *    the set of candidate source address MUST only
 888                  *    include addresses assigned to interfaces
 889                  *    belonging to the same link as the outgoing
 890                  *    interface.
 891                  * (- For site-local destination addresses, the
 892                  *    set of candidate source addresses MUST only
 893                  *    include addresses assigned to interfaces
 894                  *    belonging to the same site as the outgoing
 895                  *    interface.)
 896                  */
 897                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 898                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 899                     daddr_dev && dev != daddr_dev)
 900                         continue;
 901
 902                 idev = __in6_dev_get(dev);
 903                 if (!idev)
 904                         continue;
 905
 906                 read_lock_bh(&idev->lock);
 907                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 908                         struct ipv6_saddr_score score;
 909
 910                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 911
 912                         /* Rule 0:
 913                          * - Tentative Address (RFC2462 section 5.4)
 914                          *  - A tentative address is not considered
 915                          *    "assigned to an interface" in the traditional
 916                          *    sense.
 917                          * - Candidate Source Address (section 4)
 918                          *  - In any case, anycast addresses, multicast
 919                          *    addresses, and the unspecified address MUST
 920                          *    NOT be included in a candidate set.
 921                          */
 922                         if (ifa->flags & IFA_F_TENTATIVE)
 923                                 continue;
 924                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 925                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 926                                 LIMIT_NETDEBUG(KERN_DEBUG
 927                                                "ADDRCONF: unspecified / multicast address"
 928                                                "assigned as unicast address on %s",
 929                                                dev->name);
 930                                 continue;
 931                         }
 932
 933                         score.attrs = 0;
 934                         score.matchlen = 0;
 935                         score.scope = 0;
 936                         score.rule = 0;
 937
 938                         if (ifa_result == NULL) {
 939                                 /* record it if the first available entry */
 940                                 goto record_it;
 941                         }
 942
 943                         /* Rule 1: Prefer same address */
 944                         if (hiscore.rule < 1) {
 945                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 946                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 947                                 hiscore.rule++;
 948                         }
 949                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 950                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 951                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 952                                         score.rule = 1;
 953                                         goto record_it;
 954                                 }
 955                         } else {
 956                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 957                                         continue;
 958                         }
 959
 960                         /* Rule 2: Prefer appropriate scope */
 961                         if (hiscore.rule < 2) {
 962                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 963                                 hiscore.rule++;
 964                         }
 965                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 966                         if (hiscore.scope < score.scope) {
 967                                 if (hiscore.scope < daddr_scope) {
 968                                         score.rule = 2;
 969                                         goto record_it;
 970                                 } else
 971                                         continue;
 972                         } else if (score.scope < hiscore.scope) {
 973                                 if (score.scope < daddr_scope)
 974                                         continue;
 975                                 else {
 976                                         score.rule = 2;
 977                                         goto record_it;
 978                                 }
 979                         }
 980
 981                         /* Rule 3: Avoid deprecated address */
 982                         if (hiscore.rule < 3) {
 983                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 984                                     !(ifa_result->flags & IFA_F_DEPRECATED))
 985                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 986                                 hiscore.rule++;
 987                         }
 988                         if (ipv6_saddr_preferred(score.addr_type) ||
 989                             !(ifa->flags & IFA_F_DEPRECATED)) {
 990                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 991                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
 992                                         score.rule = 3;
 993                                         goto record_it;
 994                                 }
 995                         } else {
 996                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
 997                                         continue;
 998                         }
 999
1000                         /* Rule 4: Prefer home address -- not implemented yet */
1001                         if (hiscore.rule < 4)
1002                                 hiscore.rule++;
1003
1004                         /* Rule 5: Prefer outgoing interface */
1005                         if (hiscore.rule < 5) {
1006                                 if (daddr_dev == NULL ||
1007                                     daddr_dev == ifa_result->idev->dev)
1008                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1009                                 hiscore.rule++;
1010                         }
1011                         if (daddr_dev == NULL ||
1012                             daddr_dev == ifa->idev->dev) {
1013                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1014                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1015                                         score.rule = 5;
1016                                         goto record_it;
1017                                 }
1018                         } else {
1019                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1020                                         continue;
1021                         }
1022
1023                         /* Rule 6: Prefer matching label */
1024                         if (hiscore.rule < 6) {
1025                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1026                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1027                                 hiscore.rule++;
1028                         }
1029                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1030                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1031                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1032                                         score.rule = 6;
1033                                         goto record_it;
1034                                 }
1035                         } else {
1036                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1037                                         continue;
1038                         }
1039
1040 #ifdef CONFIG_IPV6_PRIVACY
1041                         /* Rule 7: Prefer public address
1042                          * Note: prefer temprary address if use_tempaddr >= 2
1043                          */
1044                         if (hiscore.rule < 7) {
1045                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1046                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1047                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1048                                 hiscore.rule++;
1049                         }
1050                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1051                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1052                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1053                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1054                                         score.rule = 7;
1055                                         goto record_it;
1056                                 }
1057                         } else {
1058                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1059                                         continue;
1060                         }
1061 #endif
1062                         /* Rule 8: Use longest matching prefix */
1063                         if (hiscore.rule < 8) {
1064                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1065                                 hiscore.rule++;
1066                         }
1067                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1068                         if (score.matchlen > hiscore.matchlen) {
1069                                 score.rule = 8;
1070                                 goto record_it;
1071                         }
1072 #if 0
1073                         else if (score.matchlen < hiscore.matchlen)
1074                                 continue;
1075 #endif
1076
1077                         /* Final Rule: choose first available one */
1078                         continue;
1079 record_it:
1080                         if (ifa_result)
1081                                 in6_ifa_put(ifa_result);
1082                         in6_ifa_hold(ifa);
1083                         ifa_result = ifa;
1084                         hiscore = score;
1085                 }
1086                 read_unlock_bh(&idev->lock);
1087         }
1088         read_unlock(&addrconf_lock);
1089         read_unlock(&dev_base_lock);
1090
1091         if (!ifa_result)
1092                 return -EADDRNOTAVAIL;
1093
1094         ipv6_addr_copy(saddr, &ifa_result->addr);
1095         in6_ifa_put(ifa_result);
1096         return 0;
1097 }
1098
1099
1100 int ipv6_get_saddr(struct dst_entry *dst,
1101                    struct in6_addr *daddr, struct in6_addr *saddr)
1102 {
1103         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1104 }
1105
1106
1107 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1108 {
1109         struct inet6_dev *idev;
1110         int err = -EADDRNOTAVAIL;
1111
1112         read_lock(&addrconf_lock);
1113         if ((idev = __in6_dev_get(dev)) != NULL) {
1114                 struct inet6_ifaddr *ifp;
1115
1116                 read_lock_bh(&idev->lock);
1117                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1118                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1119                                 ipv6_addr_copy(addr, &ifp->addr);
1120                                 err = 0;
1121                                 break;
1122                         }
1123                 }
1124                 read_unlock_bh(&idev->lock);
1125         }
1126         read_unlock(&addrconf_lock);
1127         return err;
1128 }
1129
1130 static int ipv6_count_addresses(struct inet6_dev *idev)
1131 {
1132         int cnt = 0;
1133         struct inet6_ifaddr *ifp;
1134
1135         read_lock_bh(&idev->lock);
1136         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1137                 cnt++;
1138         read_unlock_bh(&idev->lock);
1139         return cnt;
1140 }
1141
1142 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1143 {
1144         struct inet6_ifaddr * ifp;
1145         u8 hash = ipv6_addr_hash(addr);
1146
1147         read_lock_bh(&addrconf_hash_lock);
1148         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1149                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1150                     !(ifp->flags&IFA_F_TENTATIVE)) {
1151                         if (dev == NULL || ifp->idev->dev == dev ||
1152                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1153                                 break;
1154                 }
1155         }
1156         read_unlock_bh(&addrconf_hash_lock);
1157         return ifp != NULL;
1158 }
1159
1160 static
1161 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1162 {
1163         struct inet6_ifaddr * ifp;
1164         u8 hash = ipv6_addr_hash(addr);
1165
1166         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1167                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1168                         if (dev == NULL || ifp->idev->dev == dev)
1169                                 break;
1170                 }
1171         }
1172         return ifp != NULL;
1173 }
1174
1175 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1176 {
1177         struct inet6_ifaddr * ifp;
1178         u8 hash = ipv6_addr_hash(addr);
1179
1180         read_lock_bh(&addrconf_hash_lock);
1181         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1182                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1183                         if (dev == NULL || ifp->idev->dev == dev ||
1184                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1185                                 in6_ifa_hold(ifp);
1186                                 break;
1187                         }
1188                 }
1189         }
1190         read_unlock_bh(&addrconf_hash_lock);
1191
1192         return ifp;
1193 }
1194
1195 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1196 {
1197         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1198         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1199         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1200         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1201         int sk_ipv6only = ipv6_only_sock(sk);
1202         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1203         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1204         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1205
1206         if (!sk2_rcv_saddr && !sk_ipv6only)
1207                 return 1;
1208
1209         if (addr_type2 == IPV6_ADDR_ANY &&
1210             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1211                 return 1;
1212
1213         if (addr_type == IPV6_ADDR_ANY &&
1214             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1215                 return 1;
1216
1217         if (sk2_rcv_saddr6 &&
1218             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1219                 return 1;
1220
1221         if (addr_type == IPV6_ADDR_MAPPED &&
1222             !sk2_ipv6only &&
1223             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1224                 return 1;
1225
1226         return 0;
1227 }
1228
1229 /* Gets referenced address, destroys ifaddr */
1230
1231 void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1232 {
1233         if (ifp->flags&IFA_F_PERMANENT) {
1234                 spin_lock_bh(&ifp->lock);
1235                 addrconf_del_timer(ifp);
1236                 ifp->flags |= IFA_F_TENTATIVE;
1237                 spin_unlock_bh(&ifp->lock);
1238                 in6_ifa_put(ifp);
1239 #ifdef CONFIG_IPV6_PRIVACY
1240         } else if (ifp->flags&IFA_F_TEMPORARY) {
1241                 struct inet6_ifaddr *ifpub;
1242                 spin_lock_bh(&ifp->lock);
1243                 ifpub = ifp->ifpub;
1244                 if (ifpub) {
1245                         in6_ifa_hold(ifpub);
1246                         spin_unlock_bh(&ifp->lock);
1247                         ipv6_create_tempaddr(ifpub, ifp);
1248                         in6_ifa_put(ifpub);
1249                 } else {
1250                         spin_unlock_bh(&ifp->lock);
1251                 }
1252                 ipv6_del_addr(ifp);
1253 #endif
1254         } else
1255                 ipv6_del_addr(ifp);
1256 }
1257
1258 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1259 {
1260         if (net_ratelimit())
1261                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1262         addrconf_dad_stop(ifp);
1263 }
1264
1265 /* Join to solicited addr multicast group. */
1266
1267 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1268 {
1269         struct in6_addr maddr;
1270
1271         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1272                 return;
1273
1274         addrconf_addr_solict_mult(addr, &maddr);
1275         ipv6_dev_mc_inc(dev, &maddr);
1276 }
1277
1278 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1279 {
1280         struct in6_addr maddr;
1281
1282         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1283                 return;
1284
1285         addrconf_addr_solict_mult(addr, &maddr);
1286         __ipv6_dev_mc_dec(idev, &maddr);
1287 }
1288
1289 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1290 {
1291         struct in6_addr addr;
1292         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1293         if (ipv6_addr_any(&addr))
1294                 return;
1295         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1296 }
1297
1298 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1299 {
1300         struct in6_addr addr;
1301         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1302         if (ipv6_addr_any(&addr))
1303                 return;
1304         __ipv6_dev_ac_dec(ifp->idev, &addr);
1305 }
1306
1307 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1308 {
1309         switch (dev->type) {
1310         case ARPHRD_ETHER:
1311         case ARPHRD_FDDI:
1312         case ARPHRD_IEEE802_TR:
1313                 if (dev->addr_len != ETH_ALEN)
1314                         return -1;
1315                 memcpy(eui, dev->dev_addr, 3);
1316                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1317
1318                 /*
1319                  * The zSeries OSA network cards can be shared among various
1320                  * OS instances, but the OSA cards have only one MAC address.
1321                  * This leads to duplicate address conflicts in conjunction
1322                  * with IPv6 if more than one instance uses the same card.
1323                  *
1324                  * The driver for these cards can deliver a unique 16-bit
1325                  * identifier for each instance sharing the same card.  It is
1326                  * placed instead of 0xFFFE in the interface identifier.  The
1327                  * "u" bit of the interface identifier is not inverted in this
1328                  * case.  Hence the resulting interface identifier has local
1329                  * scope according to RFC2373.
1330                  */
1331                 if (dev->dev_id) {
1332                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1333                         eui[4] = dev->dev_id & 0xFF;
1334                 } else {
1335                         eui[3] = 0xFF;
1336                         eui[4] = 0xFE;
1337                         eui[0] ^= 2;
1338                 }
1339                 return 0;
1340         case ARPHRD_ARCNET:
1341                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1342                 if (dev->addr_len != ARCNET_ALEN)
1343                         return -1;
1344                 memset(eui, 0, 7);
1345                 eui[7] = *(u8*)dev->dev_addr;
1346                 return 0;
1347         case ARPHRD_INFINIBAND:
1348                 if (dev->addr_len != INFINIBAND_ALEN)
1349                         return -1;
1350                 memcpy(eui, dev->dev_addr + 12, 8);
1351                 eui[0] |= 2;
1352                 return 0;
1353         }
1354         return -1;
1355 }
1356
1357 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1358 {
1359         int err = -1;
1360         struct inet6_ifaddr *ifp;
1361
1362         read_lock_bh(&idev->lock);
1363         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1364                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1365                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1366                         err = 0;
1367                         break;
1368                 }
1369         }
1370         read_unlock_bh(&idev->lock);
1371         return err;
1372 }
1373
1374 #ifdef CONFIG_IPV6_PRIVACY
1375 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1376 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1377 {
1378         struct net_device *dev;
1379         struct scatterlist sg[2];
1380
1381         sg_set_buf(&sg[0], idev->entropy, 8);
1382         sg_set_buf(&sg[1], idev->work_eui64, 8);
1383
1384         dev = idev->dev;
1385
1386         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1387                 printk(KERN_INFO
1388                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1389                         idev);
1390                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1391         }
1392 regen:
1393         spin_lock(&md5_tfm_lock);
1394         if (unlikely(md5_tfm == NULL)) {
1395                 spin_unlock(&md5_tfm_lock);
1396                 return -1;
1397         }
1398         crypto_digest_init(md5_tfm);
1399         crypto_digest_update(md5_tfm, sg, 2);
1400         crypto_digest_final(md5_tfm, idev->work_digest);
1401         spin_unlock(&md5_tfm_lock);
1402
1403         memcpy(idev->rndid, &idev->work_digest[0], 8);
1404         idev->rndid[0] &= ~0x02;
1405         memcpy(idev->entropy, &idev->work_digest[8], 8);
1406
1407         /*
1408          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1409          * check if generated address is not inappropriate
1410          *
1411          *  - Reserved subnet anycast (RFC 2526)
1412          *      11111101 11....11 1xxxxxxx
1413          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1414          *      00-00-5E-FE-xx-xx-xx-xx
1415          *  - value 0
1416          *  - XXX: already assigned to an address on the device
1417          */
1418         if (idev->rndid[0] == 0xfd &&
1419             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1420             (idev->rndid[7]&0x80))
1421                 goto regen;
1422         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1423                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1424                         goto regen;
1425                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1426                         goto regen;
1427         }
1428
1429         return 0;
1430 }
1431
1432 static void ipv6_regen_rndid(unsigned long data)
1433 {
1434         struct inet6_dev *idev = (struct inet6_dev *) data;
1435         unsigned long expires;
1436
1437         read_lock_bh(&addrconf_lock);
1438         write_lock_bh(&idev->lock);
1439
1440         if (idev->dead)
1441                 goto out;
1442
1443         if (__ipv6_regen_rndid(idev) < 0)
1444                 goto out;
1445
1446         expires = jiffies +
1447                 idev->cnf.temp_prefered_lft * HZ -
1448                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1449         if (time_before(expires, jiffies)) {
1450                 printk(KERN_WARNING
1451                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1452                         idev->dev->name);
1453                 goto out;
1454         }
1455
1456         if (!mod_timer(&idev->regen_timer, expires))
1457                 in6_dev_hold(idev);
1458
1459 out:
1460         write_unlock_bh(&idev->lock);
1461         read_unlock_bh(&addrconf_lock);
1462         in6_dev_put(idev);
1463 }
1464
1465 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1466         int ret = 0;
1467
1468         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1469                 ret = __ipv6_regen_rndid(idev);
1470         return ret;
1471 }
1472 #endif
1473
1474 /*
1475  *      Add prefix route.
1476  */
1477
1478 static void
1479 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1480                       unsigned long expires, u32 flags)
1481 {
1482         struct in6_rtmsg rtmsg;
1483
1484         memset(&rtmsg, 0, sizeof(rtmsg));
1485         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1486         rtmsg.rtmsg_dst_len = plen;
1487         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1488         rtmsg.rtmsg_ifindex = dev->ifindex;
1489         rtmsg.rtmsg_info = expires;
1490         rtmsg.rtmsg_flags = RTF_UP|flags;
1491         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1492
1493         /* Prevent useless cloning on PtP SIT.
1494            This thing is done here expecting that the whole
1495            class of non-broadcast devices need not cloning.
1496          */
1497         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1498                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1499
1500         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1501 }
1502
1503 /* Create "default" multicast route to the interface */
1504
1505 static void addrconf_add_mroute(struct net_device *dev)
1506 {
1507         struct in6_rtmsg rtmsg;
1508
1509         memset(&rtmsg, 0, sizeof(rtmsg));
1510         ipv6_addr_set(&rtmsg.rtmsg_dst,
1511                       htonl(0xFF000000), 0, 0, 0);
1512         rtmsg.rtmsg_dst_len = 8;
1513         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1514         rtmsg.rtmsg_ifindex = dev->ifindex;
1515         rtmsg.rtmsg_flags = RTF_UP;
1516         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1517         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1518 }
1519
1520 static void sit_route_add(struct net_device *dev)
1521 {
1522         struct in6_rtmsg rtmsg;
1523
1524         memset(&rtmsg, 0, sizeof(rtmsg));
1525
1526         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1527         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1528
1529         /* prefix length - 96 bits "::d.d.d.d" */
1530         rtmsg.rtmsg_dst_len     = 96;
1531         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1532         rtmsg.rtmsg_ifindex     = dev->ifindex;
1533
1534         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1535 }
1536
1537 static void addrconf_add_lroute(struct net_device *dev)
1538 {
1539         struct in6_addr addr;
1540
1541         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1542         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1543 }
1544
1545 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1546 {
1547         struct inet6_dev *idev;
1548
1549         ASSERT_RTNL();
1550
1551         if ((idev = ipv6_find_idev(dev)) == NULL)
1552                 return NULL;
1553
1554         /* Add default multicast route */
1555         addrconf_add_mroute(dev);
1556
1557         /* Add link local route */
1558         addrconf_add_lroute(dev);
1559         return idev;
1560 }
1561
1562 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1563 {
1564         struct prefix_info *pinfo;
1565         __u32 valid_lft;
1566         __u32 prefered_lft;
1567         int addr_type;
1568         unsigned long rt_expires;
1569         struct inet6_dev *in6_dev;
1570
1571         pinfo = (struct prefix_info *) opt;
1572
1573         if (len < sizeof(struct prefix_info)) {
1574                 ADBG(("addrconf: prefix option too short\n"));
1575                 return;
1576         }
1577
1578         /*
1579          *      Validation checks ([ADDRCONF], page 19)
1580          */
1581
1582         addr_type = ipv6_addr_type(&pinfo->prefix);
1583
1584         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1585                 return;
1586
1587         valid_lft = ntohl(pinfo->valid);
1588         prefered_lft = ntohl(pinfo->prefered);
1589
1590         if (prefered_lft > valid_lft) {
1591                 if (net_ratelimit())
1592                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1593                 return;
1594         }
1595
1596         in6_dev = in6_dev_get(dev);
1597
1598         if (in6_dev == NULL) {
1599                 if (net_ratelimit())
1600                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1601                 return;
1602         }
1603
1604         /*
1605          *      Two things going on here:
1606          *      1) Add routes for on-link prefixes
1607          *      2) Configure prefixes with the auto flag set
1608          */
1609
1610         /* Avoid arithmetic overflow. Really, we could
1611            save rt_expires in seconds, likely valid_lft,
1612            but it would require division in fib gc, that it
1613            not good.
1614          */
1615         if (valid_lft >= 0x7FFFFFFF/HZ)
1616                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1617         else
1618                 rt_expires = valid_lft * HZ;
1619
1620         /*
1621          * We convert this (in jiffies) to clock_t later.
1622          * Avoid arithmetic overflow there as well.
1623          * Overflow can happen only if HZ < USER_HZ.
1624          */
1625         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1626                 rt_expires = 0x7FFFFFFF / USER_HZ;
1627
1628         if (pinfo->onlink) {
1629                 struct rt6_info *rt;
1630                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1631
1632                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1633                         if (rt->rt6i_flags&RTF_EXPIRES) {
1634                                 if (valid_lft == 0) {
1635                                         ip6_del_rt(rt, NULL, NULL, NULL);
1636                                         rt = NULL;
1637                                 } else {
1638                                         rt->rt6i_expires = jiffies + rt_expires;
1639                                 }
1640                         }
1641                 } else if (valid_lft) {
1642                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1643                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1644                 }
1645                 if (rt)
1646                         dst_release(&rt->u.dst);
1647         }
1648
1649         /* Try to figure out our local address for this prefix */
1650
1651         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1652                 struct inet6_ifaddr * ifp;
1653                 struct in6_addr addr;
1654                 int create = 0, update_lft = 0;
1655
1656                 if (pinfo->prefix_len == 64) {
1657                         memcpy(&addr, &pinfo->prefix, 8);
1658                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1659                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1660                                 in6_dev_put(in6_dev);
1661                                 return;
1662                         }
1663                         goto ok;
1664                 }
1665                 if (net_ratelimit())
1666                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1667                                pinfo->prefix_len);
1668                 in6_dev_put(in6_dev);
1669                 return;
1670
1671 ok:
1672
1673                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1674
1675                 if (ifp == NULL && valid_lft) {
1676                         int max_addresses = in6_dev->cnf.max_addresses;
1677
1678                         /* Do not allow to create too much of autoconfigured
1679                          * addresses; this would be too easy way to crash kernel.
1680                          */
1681                         if (!max_addresses ||
1682                             ipv6_count_addresses(in6_dev) < max_addresses)
1683                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1684                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1685
1686                         if (!ifp || IS_ERR(ifp)) {
1687                                 in6_dev_put(in6_dev);
1688                                 return;
1689                         }
1690
1691                         update_lft = create = 1;
1692                         ifp->cstamp = jiffies;
1693                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1694                 }
1695
1696                 if (ifp) {
1697                         int flags;
1698                         unsigned long now;
1699 #ifdef CONFIG_IPV6_PRIVACY
1700                         struct inet6_ifaddr *ift;
1701 #endif
1702                         u32 stored_lft;
1703
1704                         /* update lifetime (RFC2462 5.5.3 e) */
1705                         spin_lock(&ifp->lock);
1706                         now = jiffies;
1707                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1708                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1709                         else
1710                                 stored_lft = 0;
1711                         if (!update_lft && stored_lft) {
1712                                 if (valid_lft > MIN_VALID_LIFETIME ||
1713                                     valid_lft > stored_lft)
1714                                         update_lft = 1;
1715                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1716                                         /* valid_lft <= stored_lft is always true */
1717                                         /* XXX: IPsec */
1718                                         update_lft = 0;
1719                                 } else {
1720                                         valid_lft = MIN_VALID_LIFETIME;
1721                                         if (valid_lft < prefered_lft)
1722                                                 prefered_lft = valid_lft;
1723                                         update_lft = 1;
1724                                 }
1725                         }
1726
1727                         if (update_lft) {
1728                                 ifp->valid_lft = valid_lft;
1729                                 ifp->prefered_lft = prefered_lft;
1730                                 ifp->tstamp = now;
1731                                 flags = ifp->flags;
1732                                 ifp->flags &= ~IFA_F_DEPRECATED;
1733                                 spin_unlock(&ifp->lock);
1734
1735                                 if (!(flags&IFA_F_TENTATIVE))
1736                                         ipv6_ifa_notify(0, ifp);
1737                         } else
1738                                 spin_unlock(&ifp->lock);
1739
1740 #ifdef CONFIG_IPV6_PRIVACY
1741                         read_lock_bh(&in6_dev->lock);
1742                         /* update all temporary addresses in the list */
1743                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1744                                 /*
1745                                  * When adjusting the lifetimes of an existing
1746                                  * temporary address, only lower the lifetimes.
1747                                  * Implementations must not increase the
1748                                  * lifetimes of an existing temporary address
1749                                  * when processing a Prefix Information Option.
1750                                  */
1751                                 spin_lock(&ift->lock);
1752                                 flags = ift->flags;
1753                                 if (ift->valid_lft > valid_lft &&
1754                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1755                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1756                                 if (ift->prefered_lft > prefered_lft &&
1757                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1758                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1759                                 spin_unlock(&ift->lock);
1760                                 if (!(flags&IFA_F_TENTATIVE))
1761                                         ipv6_ifa_notify(0, ift);
1762                         }
1763
1764                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1765                                 /*
1766                                  * When a new public address is created as described in [ADDRCONF],
1767                                  * also create a new temporary address.
1768                                  */
1769                                 read_unlock_bh(&in6_dev->lock);
1770                                 ipv6_create_tempaddr(ifp, NULL);
1771                         } else {
1772                                 read_unlock_bh(&in6_dev->lock);
1773                         }
1774 #endif
1775                         in6_ifa_put(ifp);
1776                         addrconf_verify(0);
1777                 }
1778         }
1779         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1780         in6_dev_put(in6_dev);
1781 }
1782
1783 /*
1784  *      Set destination address.
1785  *      Special case for SIT interfaces where we create a new "virtual"
1786  *      device.
1787  */
1788 int addrconf_set_dstaddr(void __user *arg)
1789 {
1790         struct in6_ifreq ireq;
1791         struct net_device *dev;
1792         int err = -EINVAL;
1793
1794         rtnl_lock();
1795
1796         err = -EFAULT;
1797         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1798                 goto err_exit;
1799
1800         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1801
1802         err = -ENODEV;
1803         if (dev == NULL)
1804                 goto err_exit;
1805
1806         if (dev->type == ARPHRD_SIT) {
1807                 struct ifreq ifr;
1808                 mm_segment_t    oldfs;
1809                 struct ip_tunnel_parm p;
1810
1811                 err = -EADDRNOTAVAIL;
1812                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1813                         goto err_exit;
1814
1815                 memset(&p, 0, sizeof(p));
1816                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1817                 p.iph.saddr = 0;
1818                 p.iph.version = 4;
1819                 p.iph.ihl = 5;
1820                 p.iph.protocol = IPPROTO_IPV6;
1821                 p.iph.ttl = 64;
1822                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1823
1824                 oldfs = get_fs(); set_fs(KERNEL_DS);
1825                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1826                 set_fs(oldfs);
1827
1828                 if (err == 0) {
1829                         err = -ENOBUFS;
1830                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1831                                 goto err_exit;
1832                         err = dev_open(dev);
1833                 }
1834         }
1835
1836 err_exit:
1837         rtnl_unlock();
1838         return err;
1839 }
1840
1841 /*
1842  *      Manual configuration of address on an interface
1843  */
1844 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1845 {
1846         struct inet6_ifaddr *ifp;
1847         struct inet6_dev *idev;
1848         struct net_device *dev;
1849         int scope;
1850
1851         ASSERT_RTNL();
1852
1853         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1854                 return -ENODEV;
1855
1856         if (!(dev->flags&IFF_UP))
1857                 return -ENETDOWN;
1858
1859         if ((idev = addrconf_add_dev(dev)) == NULL)
1860                 return -ENOBUFS;
1861
1862         scope = ipv6_addr_scope(pfx);
1863
1864         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1865         if (!IS_ERR(ifp)) {
1866                 addrconf_dad_start(ifp, 0);
1867                 in6_ifa_put(ifp);
1868                 return 0;
1869         }
1870
1871         return PTR_ERR(ifp);
1872 }
1873
1874 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1875 {
1876         struct inet6_ifaddr *ifp;
1877         struct inet6_dev *idev;
1878         struct net_device *dev;
1879
1880         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1881                 return -ENODEV;
1882
1883         if ((idev = __in6_dev_get(dev)) == NULL)
1884                 return -ENXIO;
1885
1886         read_lock_bh(&idev->lock);
1887         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1888                 if (ifp->prefix_len == plen &&
1889                     ipv6_addr_equal(pfx, &ifp->addr)) {
1890                         in6_ifa_hold(ifp);
1891                         read_unlock_bh(&idev->lock);
1892
1893                         ipv6_del_addr(ifp);
1894
1895                         /* If the last address is deleted administratively,
1896                            disable IPv6 on this interface.
1897                          */
1898                         if (idev->addr_list == NULL)
1899                                 addrconf_ifdown(idev->dev, 1);
1900                         return 0;
1901                 }
1902         }
1903         read_unlock_bh(&idev->lock);
1904         return -EADDRNOTAVAIL;
1905 }
1906
1907
1908 int addrconf_add_ifaddr(void __user *arg)
1909 {
1910         struct in6_ifreq ireq;
1911         int err;
1912
1913         if (!capable(CAP_NET_ADMIN))
1914                 return -EPERM;
1915
1916         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1917                 return -EFAULT;
1918
1919         rtnl_lock();
1920         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1921         rtnl_unlock();
1922         return err;
1923 }
1924
1925 int addrconf_del_ifaddr(void __user *arg)
1926 {
1927         struct in6_ifreq ireq;
1928         int err;
1929
1930         if (!capable(CAP_NET_ADMIN))
1931                 return -EPERM;
1932
1933         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1934                 return -EFAULT;
1935
1936         rtnl_lock();
1937         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1938         rtnl_unlock();
1939         return err;
1940 }
1941
1942 static void sit_add_v4_addrs(struct inet6_dev *idev)
1943 {
1944         struct inet6_ifaddr * ifp;
1945         struct in6_addr addr;
1946         struct net_device *dev;
1947         int scope;
1948
1949         ASSERT_RTNL();
1950
1951         memset(&addr, 0, sizeof(struct in6_addr));
1952         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1953
1954         if (idev->dev->flags&IFF_POINTOPOINT) {
1955                 addr.s6_addr32[0] = htonl(0xfe800000);
1956                 scope = IFA_LINK;
1957         } else {
1958                 scope = IPV6_ADDR_COMPATv4;
1959         }
1960
1961         if (addr.s6_addr32[3]) {
1962                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1963                 if (!IS_ERR(ifp)) {
1964                         spin_lock_bh(&ifp->lock);
1965                         ifp->flags &= ~IFA_F_TENTATIVE;
1966                         spin_unlock_bh(&ifp->lock);
1967                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1968                         in6_ifa_put(ifp);
1969                 }
1970                 return;
1971         }
1972
1973         for (dev = dev_base; dev != NULL; dev = dev->next) {
1974                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1975                 if (in_dev && (dev->flags & IFF_UP)) {
1976                         struct in_ifaddr * ifa;
1977
1978                         int flag = scope;
1979
1980                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1981                                 int plen;
1982
1983                                 addr.s6_addr32[3] = ifa->ifa_local;
1984
1985                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1986                                         continue;
1987                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1988                                         if (idev->dev->flags&IFF_POINTOPOINT)
1989                                                 continue;
1990                                         flag |= IFA_HOST;
1991                                 }
1992                                 if (idev->dev->flags&IFF_POINTOPOINT)
1993                                         plen = 64;
1994                                 else
1995                                         plen = 96;
1996
1997                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1998                                                     IFA_F_PERMANENT);
1999                                 if (!IS_ERR(ifp)) {
2000                                         spin_lock_bh(&ifp->lock);
2001                                         ifp->flags &= ~IFA_F_TENTATIVE;
2002                                         spin_unlock_bh(&ifp->lock);
2003                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2004                                         in6_ifa_put(ifp);
2005                                 }
2006                         }
2007                 }
2008         }
2009 }
2010
2011 static void init_loopback(struct net_device *dev)
2012 {
2013         struct inet6_dev  *idev;
2014         struct inet6_ifaddr * ifp;
2015
2016         /* ::1 */
2017
2018         ASSERT_RTNL();
2019
2020         if ((idev = ipv6_find_idev(dev)) == NULL) {
2021                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2022                 return;
2023         }
2024
2025         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2026         if (!IS_ERR(ifp)) {
2027                 spin_lock_bh(&ifp->lock);
2028                 ifp->flags &= ~IFA_F_TENTATIVE;
2029                 spin_unlock_bh(&ifp->lock);
2030                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2031                 in6_ifa_put(ifp);
2032         }
2033 }
2034
2035 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2036 {
2037         struct inet6_ifaddr * ifp;
2038
2039         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2040         if (!IS_ERR(ifp)) {
2041                 addrconf_dad_start(ifp, 0);
2042                 in6_ifa_put(ifp);
2043         }
2044 }
2045
2046 static void addrconf_dev_config(struct net_device *dev)
2047 {
2048         struct in6_addr addr;
2049         struct inet6_dev    * idev;
2050
2051         ASSERT_RTNL();
2052
2053         if ((dev->type != ARPHRD_ETHER) &&
2054             (dev->type != ARPHRD_FDDI) &&
2055             (dev->type != ARPHRD_IEEE802_TR) &&
2056             (dev->type != ARPHRD_ARCNET) &&
2057             (dev->type != ARPHRD_INFINIBAND)) {
2058                 /* Alas, we support only Ethernet autoconfiguration. */
2059                 return;
2060         }
2061
2062         idev = addrconf_add_dev(dev);
2063         if (idev == NULL)
2064                 return;
2065
2066         memset(&addr, 0, sizeof(struct in6_addr));
2067         addr.s6_addr32[0] = htonl(0xFE800000);
2068
2069         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2070                 addrconf_add_linklocal(idev, &addr);
2071 }
2072
2073 static void addrconf_sit_config(struct net_device *dev)
2074 {
2075         struct inet6_dev *idev;
2076
2077         ASSERT_RTNL();
2078
2079         /*
2080          * Configure the tunnel with one of our IPv4
2081          * addresses... we should configure all of
2082          * our v4 addrs in the tunnel
2083          */
2084
2085         if ((idev = ipv6_find_idev(dev)) == NULL) {
2086                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2087                 return;
2088         }
2089
2090         sit_add_v4_addrs(idev);
2091
2092         if (dev->flags&IFF_POINTOPOINT) {
2093                 addrconf_add_mroute(dev);
2094                 addrconf_add_lroute(dev);
2095         } else
2096                 sit_route_add(dev);
2097 }
2098
2099 static inline int
2100 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2101 {
2102         struct in6_addr lladdr;
2103
2104         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2105                 addrconf_add_linklocal(idev, &lladdr);
2106                 return 0;
2107         }
2108         return -1;
2109 }
2110
2111 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2112 {
2113         struct net_device *link_dev;
2114
2115         /* first try to inherit the link-local address from the link device */
2116         if (idev->dev->iflink &&
2117             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2118                 if (!ipv6_inherit_linklocal(idev, link_dev))
2119                         return;
2120         }
2121         /* then try to inherit it from any device */
2122         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2123                 if (!ipv6_inherit_linklocal(idev, link_dev))
2124                         return;
2125         }
2126         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2127 }
2128
2129 /*
2130  * Autoconfigure tunnel with a link-local address so routing protocols,
2131  * DHCPv6, MLD etc. can be run over the virtual link
2132  */
2133
2134 static void addrconf_ip6_tnl_config(struct net_device *dev)
2135 {
2136         struct inet6_dev *idev;
2137
2138         ASSERT_RTNL();
2139
2140         if ((idev = addrconf_add_dev(dev)) == NULL) {
2141                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2142                 return;
2143         }
2144         ip6_tnl_add_linklocal(idev);
2145         addrconf_add_mroute(dev);
2146 }
2147
2148 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2149                            void * data)
2150 {
2151         struct net_device *dev = (struct net_device *) data;
2152         struct inet6_dev *idev = __in6_dev_get(dev);
2153         int run_pending = 0;
2154
2155         switch(event) {
2156         case NETDEV_UP:
2157         case NETDEV_CHANGE:
2158                 if (event == NETDEV_UP) {
2159                         if (!netif_carrier_ok(dev)) {
2160                                 /* device is not ready yet. */
2161                                 printk(KERN_INFO
2162                                         "ADDRCONF(NETDEV_UP): %s: "
2163                                         "link is not ready\n",
2164                                         dev->name);
2165                                 break;
2166                         }
2167                 } else {
2168                         if (!netif_carrier_ok(dev)) {
2169                                 /* device is still not ready. */
2170                                 break;
2171                         }
2172
2173                         if (idev) {
2174                                 if (idev->if_flags & IF_READY) {
2175                                         /* device is already configured. */
2176                                         break;
2177                                 }
2178                                 idev->if_flags |= IF_READY;
2179                         }
2180
2181                         printk(KERN_INFO
2182                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2183                                         "link becomes ready\n",
2184                                         dev->name);
2185
2186                         run_pending = 1;
2187                 }
2188
2189                 switch(dev->type) {
2190                 case ARPHRD_SIT:
2191                         addrconf_sit_config(dev);
2192                         break;
2193                 case ARPHRD_TUNNEL6:
2194                         addrconf_ip6_tnl_config(dev);
2195                         break;
2196                 case ARPHRD_LOOPBACK:
2197                         init_loopback(dev);
2198                         break;
2199
2200                 default:
2201                         addrconf_dev_config(dev);
2202                         break;
2203                 };
2204                 if (idev) {
2205                         if (run_pending)
2206                                 addrconf_dad_run(idev);
2207
2208                         /* If the MTU changed during the interface down, when the
2209                            interface up, the changed MTU must be reflected in the
2210                            idev as well as routers.
2211                          */
2212                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2213                                 rt6_mtu_change(dev, dev->mtu);
2214                                 idev->cnf.mtu6 = dev->mtu;
2215                         }
2216                         idev->tstamp = jiffies;
2217                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2218                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2219                            stop IPv6 on this interface.
2220                          */
2221                         if (dev->mtu < IPV6_MIN_MTU)
2222                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2223                 }
2224                 break;
2225
2226         case NETDEV_CHANGEMTU:
2227                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2228                         rt6_mtu_change(dev, dev->mtu);
2229                         idev->cnf.mtu6 = dev->mtu;
2230                         break;
2231                 }
2232
2233                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2234
2235         case NETDEV_DOWN:
2236         case NETDEV_UNREGISTER:
2237                 /*
2238                  *      Remove all addresses from this interface.
2239                  */
2240                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2241                 break;
2242
2243         case NETDEV_CHANGENAME:
2244 #ifdef CONFIG_SYSCTL
2245                 if (idev) {
2246                         addrconf_sysctl_unregister(&idev->cnf);
2247                         neigh_sysctl_unregister(idev->nd_parms);
2248                         neigh_sysctl_register(dev, idev->nd_parms,
2249                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2250                                               &ndisc_ifinfo_sysctl_change,
2251                                               NULL);
2252                         addrconf_sysctl_register(idev, &idev->cnf);
2253                 }
2254 #endif
2255                 break;
2256         };
2257
2258         return NOTIFY_OK;
2259 }
2260
2261 /*
2262  *      addrconf module should be notified of a device going up
2263  */
2264 static struct notifier_block ipv6_dev_notf = {
2265         .notifier_call = addrconf_notify,
2266         .priority = 0
2267 };
2268
2269 static int addrconf_ifdown(struct net_device *dev, int how)
2270 {
2271         struct inet6_dev *idev;
2272         struct inet6_ifaddr *ifa, **bifa;
2273         int i;
2274
2275         ASSERT_RTNL();
2276
2277         if (dev == &loopback_dev && how == 1)
2278                 how = 0;
2279
2280         rt6_ifdown(dev);
2281         neigh_ifdown(&nd_tbl, dev);
2282
2283         idev = __in6_dev_get(dev);
2284         if (idev == NULL)
2285                 return -ENODEV;
2286
2287         /* Step 1: remove reference to ipv6 device from parent device.
2288                    Do not dev_put!
2289          */
2290         if (how == 1) {
2291                 write_lock_bh(&addrconf_lock);
2292                 dev->ip6_ptr = NULL;
2293                 idev->dead = 1;
2294                 write_unlock_bh(&addrconf_lock);
2295
2296                 /* Step 1.5: remove snmp6 entry */
2297                 snmp6_unregister_dev(idev);
2298
2299         }
2300
2301         /* Step 2: clear hash table */
2302         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2303                 bifa = &inet6_addr_lst[i];
2304
2305                 write_lock_bh(&addrconf_hash_lock);
2306                 while ((ifa = *bifa) != NULL) {
2307                         if (ifa->idev == idev) {
2308                                 *bifa = ifa->lst_next;
2309                                 ifa->lst_next = NULL;
2310                                 addrconf_del_timer(ifa);
2311                                 in6_ifa_put(ifa);
2312                                 continue;
2313                         }
2314                         bifa = &ifa->lst_next;
2315                 }
2316                 write_unlock_bh(&addrconf_hash_lock);
2317         }
2318
2319         write_lock_bh(&idev->lock);
2320
2321         /* Step 3: clear flags for stateless addrconf */
2322         if (how != 1)
2323                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2324
2325         /* Step 4: clear address list */
2326 #ifdef CONFIG_IPV6_PRIVACY
2327         if (how == 1 && del_timer(&idev->regen_timer))
2328                 in6_dev_put(idev);
2329
2330         /* clear tempaddr list */
2331         while ((ifa = idev->tempaddr_list) != NULL) {
2332                 idev->tempaddr_list = ifa->tmp_next;
2333                 ifa->tmp_next = NULL;
2334                 ifa->dead = 1;
2335                 write_unlock_bh(&idev->lock);
2336                 spin_lock_bh(&ifa->lock);
2337
2338                 if (ifa->ifpub) {
2339                         in6_ifa_put(ifa->ifpub);
2340                         ifa->ifpub = NULL;
2341                 }
2342                 spin_unlock_bh(&ifa->lock);
2343                 in6_ifa_put(ifa);
2344                 write_lock_bh(&idev->lock);
2345         }
2346 #endif
2347         while ((ifa = idev->addr_list) != NULL) {
2348                 idev->addr_list = ifa->if_next;
2349                 ifa->if_next = NULL;
2350                 ifa->dead = 1;
2351                 addrconf_del_timer(ifa);
2352                 write_unlock_bh(&idev->lock);
2353
2354                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2355                 in6_ifa_put(ifa);
2356
2357                 write_lock_bh(&idev->lock);
2358         }
2359         write_unlock_bh(&idev->lock);
2360
2361         /* Step 5: Discard multicast list */
2362
2363         if (how == 1)
2364                 ipv6_mc_destroy_dev(idev);
2365         else
2366                 ipv6_mc_down(idev);
2367
2368         /* Step 5: netlink notification of this interface */
2369         idev->tstamp = jiffies;
2370         inet6_ifinfo_notify(RTM_DELLINK, idev);
2371
2372         /* Shot the device (if unregistered) */
2373
2374         if (how == 1) {
2375 #ifdef CONFIG_SYSCTL
2376                 addrconf_sysctl_unregister(&idev->cnf);
2377                 neigh_sysctl_unregister(idev->nd_parms);
2378 #endif
2379                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2380                 neigh_ifdown(&nd_tbl, dev);
2381                 in6_dev_put(idev);
2382         }
2383         return 0;
2384 }
2385
2386 static void addrconf_rs_timer(unsigned long data)
2387 {
2388         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2389
2390         if (ifp->idev->cnf.forwarding)
2391                 goto out;
2392
2393         if (ifp->idev->if_flags & IF_RA_RCVD) {
2394                 /*
2395                  *      Announcement received after solicitation
2396                  *      was sent
2397                  */
2398                 goto out;
2399         }
2400
2401         spin_lock(&ifp->lock);
2402         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2403                 struct in6_addr all_routers;
2404
2405                 /* The wait after the last probe can be shorter */
2406                 addrconf_mod_timer(ifp, AC_RS,
2407                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2408                                    ifp->idev->cnf.rtr_solicit_delay :
2409                                    ifp->idev->cnf.rtr_solicit_interval);
2410                 spin_unlock(&ifp->lock);
2411
2412                 ipv6_addr_all_routers(&all_routers);
2413
2414                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2415         } else {
2416                 spin_unlock(&ifp->lock);
2417                 /*
2418                  * Note: we do not support deprecated "all on-link"
2419                  * assumption any longer.
2420                  */
2421                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2422                        ifp->idev->dev->name);
2423         }
2424
2425 out:
2426         in6_ifa_put(ifp);
2427 }
2428
2429 /*
2430  *      Duplicate Address Detection
2431  */
2432 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2433 {
2434         unsigned long rand_num;
2435         struct inet6_dev *idev = ifp->idev;
2436
2437         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2438         ifp->probes = idev->cnf.dad_transmits;
2439         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2440 }
2441
2442 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2443 {
2444         struct inet6_dev *idev = ifp->idev;
2445         struct net_device *dev = idev->dev;
2446
2447         addrconf_join_solict(dev, &ifp->addr);
2448
2449         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2450                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2451                                         flags);
2452
2453         net_srandom(ifp->addr.s6_addr32[3]);
2454
2455         read_lock_bh(&idev->lock);
2456         if (ifp->dead)
2457                 goto out;
2458         spin_lock_bh(&ifp->lock);
2459
2460         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2461             !(ifp->flags&IFA_F_TENTATIVE)) {
2462                 ifp->flags &= ~IFA_F_TENTATIVE;
2463                 spin_unlock_bh(&ifp->lock);
2464                 read_unlock_bh(&idev->lock);
2465
2466                 addrconf_dad_completed(ifp);
2467                 return;
2468         }
2469
2470         if (idev->if_flags & IF_READY) {
2471                 addrconf_dad_kick(ifp);
2472                 spin_unlock_bh(&ifp->lock);
2473         } else {
2474                 spin_unlock_bh(&ifp->lock);
2475                 /*
2476                  * If the defice is not ready:
2477                  * - keep it tentative if it is a permanent address.
2478                  * - otherwise, kill it.
2479                  */
2480                 in6_ifa_hold(ifp);
2481                 addrconf_dad_stop(ifp);
2482         }
2483 out:
2484         read_unlock_bh(&idev->lock);
2485 }
2486
2487 static void addrconf_dad_timer(unsigned long data)
2488 {
2489         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2490         struct inet6_dev *idev = ifp->idev;
2491         struct in6_addr unspec;
2492         struct in6_addr mcaddr;
2493
2494         read_lock_bh(&idev->lock);
2495         if (idev->dead) {
2496                 read_unlock_bh(&idev->lock);
2497                 goto out;
2498         }
2499         spin_lock_bh(&ifp->lock);
2500         if (ifp->probes == 0) {
2501                 /*
2502                  * DAD was successful
2503                  */
2504
2505                 ifp->flags &= ~IFA_F_TENTATIVE;
2506                 spin_unlock_bh(&ifp->lock);
2507                 read_unlock_bh(&idev->lock);
2508
2509                 addrconf_dad_completed(ifp);
2510
2511                 goto out;
2512         }
2513
2514         ifp->probes--;
2515         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2516         spin_unlock_bh(&ifp->lock);
2517         read_unlock_bh(&idev->lock);
2518
2519         /* send a neighbour solicitation for our addr */
2520         memset(&unspec, 0, sizeof(unspec));
2521         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2522         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2523 out:
2524         in6_ifa_put(ifp);
2525 }
2526
2527 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2528 {
2529         struct net_device *     dev = ifp->idev->dev;
2530
2531         /*
2532          *      Configure the address for reception. Now it is valid.
2533          */
2534
2535         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2536
2537         /* If added prefix is link local and forwarding is off,
2538            start sending router solicitations.
2539          */
2540
2541         if (ifp->idev->cnf.forwarding == 0 &&
2542             ifp->idev->cnf.rtr_solicits > 0 &&
2543             (dev->flags&IFF_LOOPBACK) == 0 &&
2544             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2545                 struct in6_addr all_routers;
2546
2547                 ipv6_addr_all_routers(&all_routers);
2548
2549                 /*
2550                  *      If a host as already performed a random delay
2551                  *      [...] as part of DAD [...] there is no need
2552                  *      to delay again before sending the first RS
2553                  */
2554                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2555
2556                 spin_lock_bh(&ifp->lock);
2557                 ifp->probes = 1;
2558                 ifp->idev->if_flags |= IF_RS_SENT;
2559                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2560                 spin_unlock_bh(&ifp->lock);
2561         }
2562 }
2563
2564 static void addrconf_dad_run(struct inet6_dev *idev) {
2565         struct inet6_ifaddr *ifp;
2566
2567         read_lock_bh(&idev->lock);
2568         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2569                 spin_lock_bh(&ifp->lock);
2570                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2571                         spin_unlock_bh(&ifp->lock);
2572                         continue;
2573                 }
2574                 spin_unlock_bh(&ifp->lock);
2575                 addrconf_dad_kick(ifp);
2576         }
2577         read_unlock_bh(&idev->lock);
2578 }
2579
2580 #ifdef CONFIG_PROC_FS
2581 struct if6_iter_state {
2582         int bucket;
2583 };
2584
2585 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2586 {
2587         struct inet6_ifaddr *ifa = NULL;
2588         struct if6_iter_state *state = seq->private;
2589
2590         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2591                 ifa = inet6_addr_lst[state->bucket];
2592                 if (ifa)
2593                         break;
2594         }
2595         return ifa;
2596 }
2597
2598 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2599 {
2600         struct if6_iter_state *state = seq->private;
2601
2602         ifa = ifa->lst_next;
2603 try_again:
2604         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2605                 ifa = inet6_addr_lst[state->bucket];
2606                 goto try_again;
2607         }
2608         return ifa;
2609 }
2610
2611 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2612 {
2613         struct inet6_ifaddr *ifa = if6_get_first(seq);
2614
2615         if (ifa)
2616                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2617                         --pos;
2618         return pos ? NULL : ifa;
2619 }
2620
2621 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2622 {
2623         read_lock_bh(&addrconf_hash_lock);
2624         return if6_get_idx(seq, *pos);
2625 }
2626
2627 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2628 {
2629         struct inet6_ifaddr *ifa;
2630
2631         ifa = if6_get_next(seq, v);
2632         ++*pos;
2633         return ifa;
2634 }
2635
2636 static void if6_seq_stop(struct seq_file *seq, void *v)
2637 {
2638         read_unlock_bh(&addrconf_hash_lock);
2639 }
2640
2641 static int if6_seq_show(struct seq_file *seq, void *v)
2642 {
2643         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2644         seq_printf(seq,
2645                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2646                    NIP6(ifp->addr),
2647                    ifp->idev->dev->ifindex,
2648                    ifp->prefix_len,
2649                    ifp->scope,
2650                    ifp->flags,
2651                    ifp->idev->dev->name);
2652         return 0;
2653 }
2654
2655 static struct seq_operations if6_seq_ops = {
2656         .start  = if6_seq_start,
2657         .next   = if6_seq_next,
2658         .show   = if6_seq_show,
2659         .stop   = if6_seq_stop,
2660 };
2661
2662 static int if6_seq_open(struct inode *inode, struct file *file)
2663 {
2664         struct seq_file *seq;
2665         int rc = -ENOMEM;
2666         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2667
2668         if (!s)
2669                 goto out;
2670         memset(s, 0, sizeof(*s));
2671
2672         rc = seq_open(file, &if6_seq_ops);
2673         if (rc)
2674                 goto out_kfree;
2675
2676         seq = file->private_data;
2677         seq->private = s;
2678 out:
2679         return rc;
2680 out_kfree:
2681         kfree(s);
2682         goto out;
2683 }
2684
2685 static struct file_operations if6_fops = {
2686         .owner          = THIS_MODULE,
2687         .open           = if6_seq_open,
2688         .read           = seq_read,
2689         .llseek         = seq_lseek,
2690         .release        = seq_release_private,
2691 };
2692
2693 int __init if6_proc_init(void)
2694 {
2695         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2696                 return -ENOMEM;
2697         return 0;
2698 }
2699
2700 void if6_proc_exit(void)
2701 {
2702         proc_net_remove("if_inet6");
2703 }
2704 #endif  /* CONFIG_PROC_FS */
2705
2706 /*
2707  *      Periodic address status verification
2708  */
2709
2710 static void addrconf_verify(unsigned long foo)
2711 {
2712         struct inet6_ifaddr *ifp;
2713         unsigned long now, next;
2714         int i;
2715
2716         spin_lock_bh(&addrconf_verify_lock);
2717         now = jiffies;
2718         next = now + ADDR_CHECK_FREQUENCY;
2719
2720         del_timer(&addr_chk_timer);
2721
2722         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2723
2724 restart:
2725                 read_lock(&addrconf_hash_lock);
2726                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2727                         unsigned long age;
2728 #ifdef CONFIG_IPV6_PRIVACY
2729                         unsigned long regen_advance;
2730 #endif
2731
2732                         if (ifp->flags & IFA_F_PERMANENT)
2733                                 continue;
2734
2735                         spin_lock(&ifp->lock);
2736                         age = (now - ifp->tstamp) / HZ;
2737
2738 #ifdef CONFIG_IPV6_PRIVACY
2739                         regen_advance = ifp->idev->cnf.regen_max_retry *
2740                                         ifp->idev->cnf.dad_transmits *
2741                                         ifp->idev->nd_parms->retrans_time / HZ;
2742 #endif
2743
2744                         if (age >= ifp->valid_lft) {
2745                                 spin_unlock(&ifp->lock);
2746                                 in6_ifa_hold(ifp);
2747                                 read_unlock(&addrconf_hash_lock);
2748                                 ipv6_del_addr(ifp);
2749                                 goto restart;
2750                         } else if (age >= ifp->prefered_lft) {
2751                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2752                                 int deprecate = 0;
2753
2754                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2755                                         deprecate = 1;
2756                                         ifp->flags |= IFA_F_DEPRECATED;
2757                                 }
2758
2759                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2760                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2761
2762                                 spin_unlock(&ifp->lock);
2763
2764                                 if (deprecate) {
2765                                         in6_ifa_hold(ifp);
2766                                         read_unlock(&addrconf_hash_lock);
2767
2768                                         ipv6_ifa_notify(0, ifp);
2769                                         in6_ifa_put(ifp);
2770                                         goto restart;
2771                                 }
2772 #ifdef CONFIG_IPV6_PRIVACY
2773                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2774                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2775                                 if (age >= ifp->prefered_lft - regen_advance) {
2776                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2777                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2778                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2779                                         if (!ifp->regen_count && ifpub) {
2780                                                 ifp->regen_count++;
2781                                                 in6_ifa_hold(ifp);
2782                                                 in6_ifa_hold(ifpub);
2783                                                 spin_unlock(&ifp->lock);
2784                                                 read_unlock(&addrconf_hash_lock);
2785                                                 spin_lock(&ifpub->lock);
2786                                                 ifpub->regen_count = 0;
2787                                                 spin_unlock(&ifpub->lock);
2788                                                 ipv6_create_tempaddr(ifpub, ifp);
2789                                                 in6_ifa_put(ifpub);
2790                                                 in6_ifa_put(ifp);
2791                                                 goto restart;
2792                                         }
2793                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2794                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2795                                 spin_unlock(&ifp->lock);
2796 #endif
2797                         } else {
2798                                 /* ifp->prefered_lft <= ifp->valid_lft */
2799                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2800                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2801                                 spin_unlock(&ifp->lock);
2802                         }
2803                 }
2804                 read_unlock(&addrconf_hash_lock);
2805         }
2806
2807         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2808         add_timer(&addr_chk_timer);
2809         spin_unlock_bh(&addrconf_verify_lock);
2810 }
2811
2812 static int
2813 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2814 {
2815         struct rtattr **rta = arg;
2816         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2817         struct in6_addr *pfx;
2818
2819         pfx = NULL;
2820         if (rta[IFA_ADDRESS-1]) {
2821                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2822                         return -EINVAL;
2823                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2824         }
2825         if (rta[IFA_LOCAL-1]) {
2826                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2827                         return -EINVAL;
2828                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2829         }
2830         if (pfx == NULL)
2831                 return -EINVAL;
2832
2833         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2834 }
2835
2836 static int
2837 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2838 {
2839         struct rtattr  **rta = arg;
2840         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2841         struct in6_addr *pfx;
2842
2843         pfx = NULL;
2844         if (rta[IFA_ADDRESS-1]) {
2845                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2846                         return -EINVAL;
2847                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2848         }
2849         if (rta[IFA_LOCAL-1]) {
2850                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2851                         return -EINVAL;
2852                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2853         }
2854         if (pfx == NULL)
2855                 return -EINVAL;
2856
2857         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2858 }
2859
2860 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2861                              u32 pid, u32 seq, int event, unsigned int flags)
2862 {
2863         struct ifaddrmsg *ifm;
2864         struct nlmsghdr  *nlh;
2865         struct ifa_cacheinfo ci;
2866         unsigned char    *b = skb->tail;
2867
2868         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2869         ifm = NLMSG_DATA(nlh);
2870         ifm->ifa_family = AF_INET6;
2871         ifm->ifa_prefixlen = ifa->prefix_len;
2872         ifm->ifa_flags = ifa->flags;
2873         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2874         if (ifa->scope&IFA_HOST)
2875                 ifm->ifa_scope = RT_SCOPE_HOST;
2876         else if (ifa->scope&IFA_LINK)
2877                 ifm->ifa_scope = RT_SCOPE_LINK;
2878         else if (ifa->scope&IFA_SITE)
2879                 ifm->ifa_scope = RT_SCOPE_SITE;
2880         ifm->ifa_index = ifa->idev->dev->ifindex;
2881         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2882         if (!(ifa->flags&IFA_F_PERMANENT)) {
2883                 ci.ifa_prefered = ifa->prefered_lft;
2884                 ci.ifa_valid = ifa->valid_lft;
2885                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2886                         long tval = (jiffies - ifa->tstamp)/HZ;
2887                         ci.ifa_prefered -= tval;
2888                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2889                                 ci.ifa_valid -= tval;
2890                 }
2891         } else {
2892                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2893                 ci.ifa_valid = INFINITY_LIFE_TIME;
2894         }
2895         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2896                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2897         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2898                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2899         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2900         nlh->nlmsg_len = skb->tail - b;
2901         return skb->len;
2902
2903 nlmsg_failure:
2904 rtattr_failure:
2905         skb_trim(skb, b - skb->data);
2906         return -1;
2907 }
2908
2909 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2910                                 u32 pid, u32 seq, int event, u16 flags)
2911 {
2912         struct ifaddrmsg *ifm;
2913         struct nlmsghdr  *nlh;
2914         struct ifa_cacheinfo ci;
2915         unsigned char    *b = skb->tail;
2916
2917         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2918         ifm = NLMSG_DATA(nlh);
2919         ifm->ifa_family = AF_INET6;
2920         ifm->ifa_prefixlen = 128;
2921         ifm->ifa_flags = IFA_F_PERMANENT;
2922         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2923         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2924                 ifm->ifa_scope = RT_SCOPE_SITE;
2925         ifm->ifa_index = ifmca->idev->dev->ifindex;
2926         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2927         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2928                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2929                     * 100 / HZ);
2930         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2931                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2932                     * 100 / HZ);
2933         ci.ifa_prefered = INFINITY_LIFE_TIME;
2934         ci.ifa_valid = INFINITY_LIFE_TIME;
2935         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2936         nlh->nlmsg_len = skb->tail - b;
2937         return skb->len;
2938
2939 nlmsg_failure:
2940 rtattr_failure:
2941         skb_trim(skb, b - skb->data);
2942         return -1;
2943 }
2944
2945 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2946                                 u32 pid, u32 seq, int event, unsigned int flags)
2947 {
2948         struct ifaddrmsg *ifm;
2949         struct nlmsghdr  *nlh;
2950         struct ifa_cacheinfo ci;
2951         unsigned char    *b = skb->tail;
2952
2953         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2954         ifm = NLMSG_DATA(nlh);
2955         ifm->ifa_family = AF_INET6;
2956         ifm->ifa_prefixlen = 128;
2957         ifm->ifa_flags = IFA_F_PERMANENT;
2958         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2959         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2960                 ifm->ifa_scope = RT_SCOPE_SITE;
2961         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2962         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2963         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2964                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2965                     * 100 / HZ);
2966         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2967                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2968                     * 100 / HZ);
2969         ci.ifa_prefered = INFINITY_LIFE_TIME;
2970         ci.ifa_valid = INFINITY_LIFE_TIME;
2971         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2972         nlh->nlmsg_len = skb->tail - b;
2973         return skb->len;
2974
2975 nlmsg_failure:
2976 rtattr_failure:
2977         skb_trim(skb, b - skb->data);
2978         return -1;
2979 }
2980
2981 enum addr_type_t
2982 {
2983         UNICAST_ADDR,
2984         MULTICAST_ADDR,
2985         ANYCAST_ADDR,
2986 };
2987
2988 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2989                            enum addr_type_t type)
2990 {
2991         int idx, ip_idx;
2992         int s_idx, s_ip_idx;
2993         int err = 1;
2994         struct net_device *dev;
2995         struct inet6_dev *idev = NULL;
2996         struct inet6_ifaddr *ifa;
2997         struct ifmcaddr6 *ifmca;
2998         struct ifacaddr6 *ifaca;
2999
3000         s_idx = cb->args[0];
3001         s_ip_idx = ip_idx = cb->args[1];
3002         read_lock(&dev_base_lock);
3003
3004         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3005                 if (idx < s_idx)
3006                         continue;
3007                 if (idx > s_idx)
3008                         s_ip_idx = 0;
3009                 ip_idx = 0;
3010                 if ((idev = in6_dev_get(dev)) == NULL)
3011                         continue;
3012                 read_lock_bh(&idev->lock);
3013                 switch (type) {
3014                 case UNICAST_ADDR:
3015                         /* unicast address incl. temp addr */
3016                         for (ifa = idev->addr_list; ifa;
3017                              ifa = ifa->if_next, ip_idx++) {
3018                                 if (ip_idx < s_ip_idx)
3019                                         continue;
3020                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3021                                     NETLINK_CB(cb->skb).pid,
3022                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3023                                     NLM_F_MULTI)) <= 0)
3024                                         goto done;
3025                         }
3026                         break;
3027                 case MULTICAST_ADDR:
3028                         /* multicast address */
3029                         for (ifmca = idev->mc_list; ifmca;
3030                              ifmca = ifmca->next, ip_idx++) {
3031                                 if (ip_idx < s_ip_idx)
3032                                         continue;
3033                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3034                                     NETLINK_CB(cb->skb).pid,
3035                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3036                                     NLM_F_MULTI)) <= 0)
3037                                         goto done;
3038                         }
3039                         break;
3040                 case ANYCAST_ADDR:
3041                         /* anycast address */
3042                         for (ifaca = idev->ac_list; ifaca;
3043                              ifaca = ifaca->aca_next, ip_idx++) {
3044                                 if (ip_idx < s_ip_idx)
3045                                         continue;
3046                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3047                                     NETLINK_CB(cb->skb).pid,
3048                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3049                                     NLM_F_MULTI)) <= 0)
3050                                         goto done;
3051                         }
3052                         break;
3053                 default:
3054                         break;
3055                 }
3056                 read_unlock_bh(&idev->lock);
3057                 in6_dev_put(idev);
3058         }
3059 done:
3060         if (err <= 0) {
3061                 read_unlock_bh(&idev->lock);
3062                 in6_dev_put(idev);
3063         }
3064         read_unlock(&dev_base_lock);
3065         cb->args[0] = idx;
3066         cb->args[1] = ip_idx;
3067         return skb->len;
3068 }
3069
3070 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3071 {
3072         enum addr_type_t type = UNICAST_ADDR;
3073         return inet6_dump_addr(skb, cb, type);
3074 }
3075
3076 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3077 {
3078         enum addr_type_t type = MULTICAST_ADDR;
3079         return inet6_dump_addr(skb, cb, type);
3080 }
3081
3082
3083 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3084 {
3085         enum addr_type_t type = ANYCAST_ADDR;
3086         return inet6_dump_addr(skb, cb, type);
3087 }
3088
3089 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3090 {
3091         struct sk_buff *skb;
3092         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3093
3094         skb = alloc_skb(size, GFP_ATOMIC);
3095         if (!skb) {
3096                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3097                 return;
3098         }
3099         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3100                 kfree_skb(skb);
3101                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3102                 return;
3103         }
3104         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3105         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3106 }
3107
3108 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3109                                 __s32 *array, int bytes)
3110 {
3111         memset(array, 0, bytes);
3112         array[DEVCONF_FORWARDING] = cnf->forwarding;
3113         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3114         array[DEVCONF_MTU6] = cnf->mtu6;
3115         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3116         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3117         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3118         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3119         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3120         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3121         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3122         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3123 #ifdef CONFIG_IPV6_PRIVACY
3124         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3125         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3126         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3127         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3128         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3129 #endif
3130         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3131 }
3132
3133 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3134                              u32 pid, u32 seq, int event, unsigned int flags)
3135 {
3136         struct net_device       *dev = idev->dev;
3137         __s32                   *array = NULL;
3138         struct ifinfomsg        *r;
3139         struct nlmsghdr         *nlh;
3140         unsigned char           *b = skb->tail;
3141         struct rtattr           *subattr;
3142         __u32                   mtu = dev->mtu;
3143         struct ifla_cacheinfo   ci;
3144
3145         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3146         r = NLMSG_DATA(nlh);
3147         r->ifi_family = AF_INET6;
3148         r->__ifi_pad = 0;
3149         r->ifi_type = dev->type;
3150         r->ifi_index = dev->ifindex;
3151         r->ifi_flags = dev_get_flags(dev);
3152         r->ifi_change = 0;
3153
3154         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3155
3156         if (dev->addr_len)
3157                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3158
3159         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3160         if (dev->ifindex != dev->iflink)
3161                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3162
3163         subattr = (struct rtattr*)skb->tail;
3164
3165         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3166
3167         /* return the device flags */
3168         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3169
3170         /* return interface cacheinfo */
3171         ci.max_reasm_len = IPV6_MAXPLEN;
3172         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3173                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3174         ci.reachable_time = idev->nd_parms->reachable_time;
3175         ci.retrans_time = idev->nd_parms->retrans_time;
3176         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3177
3178         /* return the device sysctl params */
3179         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3180                 goto rtattr_failure;
3181         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3182         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3183
3184         /* XXX - Statistics/MC not implemented */
3185         subattr->rta_len = skb->tail - (u8*)subattr;
3186
3187         nlh->nlmsg_len = skb->tail - b;
3188         kfree(array);
3189         return skb->len;
3190
3191 nlmsg_failure:
3192 rtattr_failure:
3193         kfree(array);
3194         skb_trim(skb, b - skb->data);
3195         return -1;
3196 }
3197
3198 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3199 {
3200         int idx, err;
3201         int s_idx = cb->args[0];
3202         struct net_device *dev;
3203         struct inet6_dev *idev;
3204
3205         read_lock(&dev_base_lock);
3206         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3207                 if (idx < s_idx)
3208                         continue;
3209                 if ((idev = in6_dev_get(dev)) == NULL)
3210                         continue;
3211                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3212                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3213                 in6_dev_put(idev);
3214                 if (err <= 0)
3215                         break;
3216         }
3217         read_unlock(&dev_base_lock);
3218         cb->args[0] = idx;
3219
3220         return skb->len;
3221 }
3222
3223 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3224 {
3225         struct sk_buff *skb;
3226         /* 128 bytes ?? */
3227         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3228
3229         skb = alloc_skb(size, GFP_ATOMIC);
3230         if (!skb) {
3231                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3232                 return;
3233         }
3234         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3235                 kfree_skb(skb);
3236                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3237                 return;
3238         }
3239         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3240         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3241 }
3242
3243 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3244                         struct prefix_info *pinfo, u32 pid, u32 seq,
3245                         int event, unsigned int flags)
3246 {
3247         struct prefixmsg        *pmsg;
3248         struct nlmsghdr         *nlh;
3249         unsigned char           *b = skb->tail;
3250         struct prefix_cacheinfo ci;
3251
3252         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3253         pmsg = NLMSG_DATA(nlh);
3254         pmsg->prefix_family = AF_INET6;
3255         pmsg->prefix_pad1 = 0;
3256         pmsg->prefix_pad2 = 0;
3257         pmsg->prefix_ifindex = idev->dev->ifindex;
3258         pmsg->prefix_len = pinfo->prefix_len;
3259         pmsg->prefix_type = pinfo->type;
3260         pmsg->prefix_pad3 = 0;
3261
3262         pmsg->prefix_flags = 0;
3263         if (pinfo->onlink)
3264                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3265         if (pinfo->autoconf)
3266                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3267
3268         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3269
3270         ci.preferred_time = ntohl(pinfo->prefered);
3271         ci.valid_time = ntohl(pinfo->valid);
3272         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3273
3274         nlh->nlmsg_len = skb->tail - b;
3275         return skb->len;
3276
3277 nlmsg_failure:
3278 rtattr_failure:
3279         skb_trim(skb, b - skb->data);
3280         return -1;
3281 }
3282
3283 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3284                          struct prefix_info *pinfo)
3285 {
3286         struct sk_buff *skb;
3287         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3288
3289         skb = alloc_skb(size, GFP_ATOMIC);
3290         if (!skb) {
3291                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3292                 return;
3293         }
3294         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3295                 kfree_skb(skb);
3296                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3297                 return;
3298         }
3299         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3300         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3301 }
3302
3303 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3304         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3305         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3306         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3307         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3308         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3309         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3310         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3311         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3312         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3313                                       .dumpit   = inet6_dump_fib, },
3314 };
3315
3316 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3317 {
3318         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3319
3320         switch (event) {
3321         case RTM_NEWADDR:
3322                 dst_hold(&ifp->rt->u.dst);
3323                 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3324                         dst_release(&ifp->rt->u.dst);
3325                 if (ifp->idev->cnf.forwarding)
3326                         addrconf_join_anycast(ifp);
3327                 break;
3328         case RTM_DELADDR:
3329                 if (ifp->idev->cnf.forwarding)
3330                         addrconf_leave_anycast(ifp);
3331                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3332                 dst_hold(&ifp->rt->u.dst);
3333                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3334                         dst_free(&ifp->rt->u.dst);
3335                 else
3336                         dst_release(&ifp->rt->u.dst);
3337                 break;
3338         }
3339 }
3340
3341 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3342 {
3343         read_lock_bh(&addrconf_lock);
3344         if (likely(ifp->idev->dead == 0))
3345                 __ipv6_ifa_notify(event, ifp);
3346         read_unlock_bh(&addrconf_lock);
3347 }
3348
3349 #ifdef CONFIG_SYSCTL
3350
3351 static
3352 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3353                            void __user *buffer, size_t *lenp, loff_t *ppos)
3354 {
3355         int *valp = ctl->data;
3356         int val = *valp;
3357         int ret;
3358
3359         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3360
3361         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3362                 if (valp != &ipv6_devconf.forwarding) {
3363                         if ((!*valp) ^ (!val)) {
3364                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3365                                 if (idev == NULL)
3366                                         return ret;
3367                                 dev_forward_change(idev);
3368                         }
3369                 } else {
3370                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3371                         addrconf_forward_change();
3372                 }
3373                 if (*valp)
3374                         rt6_purge_dflt_routers();
3375         }
3376
3377         return ret;
3378 }
3379
3380 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3381                                             int __user *name, int nlen,
3382                                             void __user *oldval,
3383                                             size_t __user *oldlenp,
3384                                             void __user *newval, size_t newlen,
3385                                             void **context)
3386 {
3387         int *valp = table->data;
3388         int new;
3389
3390         if (!newval || !newlen)
3391                 return 0;
3392         if (newlen != sizeof(int))
3393                 return -EINVAL;
3394         if (get_user(new, (int __user *)newval))
3395                 return -EFAULT;
3396         if (new == *valp)
3397                 return 0;
3398         if (oldval && oldlenp) {
3399                 size_t len;
3400                 if (get_user(len, oldlenp))
3401                         return -EFAULT;
3402                 if (len) {
3403                         if (len > table->maxlen)
3404                                 len = table->maxlen;
3405                         if (copy_to_user(oldval, valp, len))
3406                                 return -EFAULT;
3407                         if (put_user(len, oldlenp))
3408                                 return -EFAULT;
3409                 }
3410         }
3411
3412         if (valp != &ipv6_devconf_dflt.forwarding) {
3413                 if (valp != &ipv6_devconf.forwarding) {
3414                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3415                         int changed;
3416                         if (unlikely(idev == NULL))
3417                                 return -ENODEV;
3418                         changed = (!*valp) ^ (!new);
3419                         *valp = new;
3420                         if (changed)
3421                                 dev_forward_change(idev);
3422                 } else {
3423                         *valp = new;
3424                         addrconf_forward_change();
3425                 }
3426
3427                 if (*valp)
3428                         rt6_purge_dflt_routers();
3429         } else
3430                 *valp = new;
3431
3432         return 1;
3433 }
3434
3435 static struct addrconf_sysctl_table
3436 {
3437         struct ctl_table_header *sysctl_header;
3438         ctl_table addrconf_vars[__NET_IPV6_MAX];
3439         ctl_table addrconf_dev[2];
3440         ctl_table addrconf_conf_dir[2];
3441         ctl_table addrconf_proto_dir[2];
3442         ctl_table addrconf_root_dir[2];
3443 } addrconf_sysctl = {
3444         .sysctl_header = NULL,
3445         .addrconf_vars = {
3446                 {
3447                         .ctl_name       =       NET_IPV6_FORWARDING,
3448                         .procname       =       "forwarding",
3449                         .data           =       &ipv6_devconf.forwarding,
3450                         .maxlen         =       sizeof(int),
3451                         .mode           =       0644,
3452                         .proc_handler   =       &addrconf_sysctl_forward,
3453                         .strategy       =       &addrconf_sysctl_forward_strategy,
3454                 },
3455                 {
3456                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3457                         .procname       =       "hop_limit",
3458                         .data           =       &ipv6_devconf.hop_limit,
3459                         .maxlen         =       sizeof(int),
3460                         .mode           =       0644,
3461                         .proc_handler   =       proc_dointvec,
3462                 },
3463                 {
3464                         .ctl_name       =       NET_IPV6_MTU,
3465                         .procname       =       "mtu",
3466                         .data           =       &ipv6_devconf.mtu6,
3467                         .maxlen         =       sizeof(int),
3468                         .mode           =       0644,
3469                         .proc_handler   =       &proc_dointvec,
3470                 },
3471                 {
3472                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3473                         .procname       =       "accept_ra",
3474                         .data           =       &ipv6_devconf.accept_ra,
3475                         .maxlen         =       sizeof(int),
3476                         .mode           =       0644,
3477                         .proc_handler   =       &proc_dointvec,
3478                 },
3479                 {
3480                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3481                         .procname       =       "accept_redirects",
3482                         .data           =       &ipv6_devconf.accept_redirects,
3483                         .maxlen         =       sizeof(int),
3484                         .mode           =       0644,
3485                         .proc_handler   =       &proc_dointvec,
3486                 },
3487                 {
3488                         .ctl_name       =       NET_IPV6_AUTOCONF,
3489                         .procname       =       "autoconf",
3490                         .data           =       &ipv6_devconf.autoconf,
3491                         .maxlen         =       sizeof(int),
3492                         .mode           =       0644,
3493                         .proc_handler   =       &proc_dointvec,
3494                 },
3495                 {
3496                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3497                         .procname       =       "dad_transmits",
3498                         .data           =       &ipv6_devconf.dad_transmits,
3499                         .maxlen         =       sizeof(int),
3500                         .mode           =       0644,
3501                         .proc_handler   =       &proc_dointvec,
3502                 },
3503                 {
3504                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3505                         .procname       =       "router_solicitations",
3506                         .data           =       &ipv6_devconf.rtr_solicits,
3507                         .maxlen         =       sizeof(int),
3508                         .mode           =       0644,
3509                         .proc_handler   =       &proc_dointvec,
3510                 },
3511                 {
3512                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3513                         .procname       =       "router_solicitation_interval",
3514                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3515                         .maxlen         =       sizeof(int),
3516                         .mode           =       0644,
3517                         .proc_handler   =       &proc_dointvec_jiffies,
3518                         .strategy       =       &sysctl_jiffies,
3519                 },
3520                 {
3521                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3522                         .procname       =       "router_solicitation_delay",
3523                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3524                         .maxlen         =       sizeof(int),
3525                         .mode           =       0644,
3526                         .proc_handler   =       &proc_dointvec_jiffies,
3527                         .strategy       =       &sysctl_jiffies,
3528                 },
3529                 {
3530                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3531                         .procname       =       "force_mld_version",
3532                         .data           =       &ipv6_devconf.force_mld_version,
3533                         .maxlen         =       sizeof(int),
3534                         .mode           =       0644,
3535                         .proc_handler   =       &proc_dointvec,
3536                 },
3537 #ifdef CONFIG_IPV6_PRIVACY
3538                 {
3539                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3540                         .procname       =       "use_tempaddr",
3541                         .data           =       &ipv6_devconf.use_tempaddr,
3542                         .maxlen         =       sizeof(int),
3543                         .mode           =       0644,
3544                         .proc_handler   =       &proc_dointvec,
3545                 },
3546                 {
3547                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3548                         .procname       =       "temp_valid_lft",
3549                         .data           =       &ipv6_devconf.temp_valid_lft,
3550                         .maxlen         =       sizeof(int),
3551                         .mode           =       0644,
3552                         .proc_handler   =       &proc_dointvec,
3553                 },
3554                 {
3555                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3556                         .procname       =       "temp_prefered_lft",
3557                         .data           =       &ipv6_devconf.temp_prefered_lft,
3558                         .maxlen         =       sizeof(int),
3559                         .mode           =       0644,
3560                         .proc_handler   =       &proc_dointvec,
3561                 },
3562                 {
3563                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3564                         .procname       =       "regen_max_retry",
3565                         .data           =       &ipv6_devconf.regen_max_retry,
3566                         .maxlen         =       sizeof(int),
3567                         .mode           =       0644,
3568                         .proc_handler   =       &proc_dointvec,
3569                 },
3570                 {
3571                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3572                         .procname       =       "max_desync_factor",
3573                         .data           =       &ipv6_devconf.max_desync_factor,
3574                         .maxlen         =       sizeof(int),
3575                         .mode           =       0644,
3576                         .proc_handler   =       &proc_dointvec,
3577                 },
3578 #endif
3579                 {
3580                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3581                         .procname       =       "max_addresses",
3582                         .data           =       &ipv6_devconf.max_addresses,
3583                         .maxlen         =       sizeof(int),
3584                         .mode           =       0644,
3585                         .proc_handler   =       &proc_dointvec,
3586                 },
3587                 {
3588                         .ctl_name       =       0,      /* sentinel */
3589                 }
3590         },
3591         .addrconf_dev = {
3592                 {
3593                         .ctl_name       =       NET_PROTO_CONF_ALL,
3594                         .procname       =       "all",
3595                         .mode           =       0555,
3596                         .child          =       addrconf_sysctl.addrconf_vars,
3597                 },
3598                 {
3599                         .ctl_name       =       0,      /* sentinel */
3600                 }
3601         },
3602         .addrconf_conf_dir = {
3603                 {
3604                         .ctl_name       =       NET_IPV6_CONF,
3605                         .procname       =       "conf",
3606                         .mode           =       0555,
3607                         .child          =       addrconf_sysctl.addrconf_dev,
3608                 },
3609                 {
3610                         .ctl_name       =       0,      /* sentinel */
3611                 }
3612         },
3613         .addrconf_proto_dir = {
3614                 {
3615                         .ctl_name       =       NET_IPV6,
3616                         .procname       =       "ipv6",
3617                         .mode           =       0555,
3618                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3619                 },
3620                 {
3621                         .ctl_name       =       0,      /* sentinel */
3622                 }
3623         },
3624         .addrconf_root_dir = {
3625                 {
3626                         .ctl_name       =       CTL_NET,
3627                         .procname       =       "net",
3628                         .mode           =       0555,
3629                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3630                 },
3631                 {
3632                         .ctl_name       =       0,      /* sentinel */
3633                 }
3634         },
3635 };
3636
3637 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3638 {
3639         int i;
3640         struct net_device *dev = idev ? idev->dev : NULL;
3641         struct addrconf_sysctl_table *t;
3642         char *dev_name = NULL;
3643
3644         t = kmalloc(sizeof(*t), GFP_KERNEL);
3645         if (t == NULL)
3646                 return;
3647         memcpy(t, &addrconf_sysctl, sizeof(*t));
3648         for (i=0; t->addrconf_vars[i].data; i++) {
3649                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3650                 t->addrconf_vars[i].de = NULL;
3651                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3652         }
3653         if (dev) {
3654                 dev_name = dev->name;
3655                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3656         } else {
3657                 dev_name = "default";
3658                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3659         }
3660
3661         /*
3662          * Make a copy of dev_name, because '.procname' is regarded as const
3663          * by sysctl and we wouldn't want anyone to change it under our feet
3664          * (see SIOCSIFNAME).
3665          */
3666         dev_name = kstrdup(dev_name, GFP_KERNEL);
3667         if (!dev_name)
3668             goto free;
3669
3670         t->addrconf_dev[0].procname = dev_name;
3671
3672         t->addrconf_dev[0].child = t->addrconf_vars;
3673         t->addrconf_dev[0].de = NULL;
3674         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3675         t->addrconf_conf_dir[0].de = NULL;
3676         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3677         t->addrconf_proto_dir[0].de = NULL;
3678         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3679         t->addrconf_root_dir[0].de = NULL;
3680
3681         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3682         if (t->sysctl_header == NULL)
3683                 goto free_procname;
3684         else
3685                 p->sysctl = t;
3686         return;
3687
3688         /* error path */
3689  free_procname:
3690         kfree(dev_name);
3691  free:
3692         kfree(t);
3693
3694         return;
3695 }
3696
3697 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3698 {
3699         if (p->sysctl) {
3700                 struct addrconf_sysctl_table *t = p->sysctl;
3701                 p->sysctl = NULL;
3702                 unregister_sysctl_table(t->sysctl_header);
3703                 kfree(t->addrconf_dev[0].procname);
3704                 kfree(t);
3705         }
3706 }
3707
3708
3709 #endif
3710
3711 /*
3712  *      Device notifier
3713  */
3714
3715 int register_inet6addr_notifier(struct notifier_block *nb)
3716 {
3717         return notifier_chain_register(&inet6addr_chain, nb);
3718 }
3719
3720 int unregister_inet6addr_notifier(struct notifier_block *nb)
3721 {
3722         return notifier_chain_unregister(&inet6addr_chain,nb);
3723 }
3724
3725 /*
3726  *      Init / cleanup code
3727  */
3728
3729 int __init addrconf_init(void)
3730 {
3731         int err = 0;
3732
3733         /* The addrconf netdev notifier requires that loopback_dev
3734          * has it's ipv6 private information allocated and setup
3735          * before it can bring up and give link-local addresses
3736          * to other devices which are up.
3737          *
3738          * Unfortunately, loopback_dev is not necessarily the first
3739          * entry in the global dev_base list of net devices.  In fact,
3740          * it is likely to be the very last entry on that list.
3741          * So this causes the notifier registry below to try and
3742          * give link-local addresses to all devices besides loopback_dev
3743          * first, then loopback_dev, which cases all the non-loopback_dev
3744          * devices to fail to get a link-local address.
3745          *
3746          * So, as a temporary fix, allocate the ipv6 structure for
3747          * loopback_dev first by hand.
3748          * Longer term, all of the dependencies ipv6 has upon the loopback
3749          * device and it being up should be removed.
3750          */
3751         rtnl_lock();
3752         if (!ipv6_add_dev(&loopback_dev))
3753                 err = -ENOMEM;
3754         rtnl_unlock();
3755         if (err)
3756                 return err;
3757
3758         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3759
3760         register_netdevice_notifier(&ipv6_dev_notf);
3761
3762 #ifdef CONFIG_IPV6_PRIVACY
3763         md5_tfm = crypto_alloc_tfm("md5", 0);
3764         if (unlikely(md5_tfm == NULL))
3765                 printk(KERN_WARNING
3766                         "failed to load transform for md5\n");
3767 #endif
3768
3769         addrconf_verify(0);
3770         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3771 #ifdef CONFIG_SYSCTL
3772         addrconf_sysctl.sysctl_header =
3773                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3774         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3775 #endif
3776
3777         return 0;
3778 }
3779
3780 void __exit addrconf_cleanup(void)
3781 {
3782         struct net_device *dev;
3783         struct inet6_dev *idev;
3784         struct inet6_ifaddr *ifa;
3785         int i;
3786
3787         unregister_netdevice_notifier(&ipv6_dev_notf);
3788
3789         rtnetlink_links[PF_INET6] = NULL;
3790 #ifdef CONFIG_SYSCTL
3791         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3792         addrconf_sysctl_unregister(&ipv6_devconf);
3793 #endif
3794
3795         rtnl_lock();
3796
3797         /*
3798          *      clean dev list.
3799          */
3800
3801         for (dev=dev_base; dev; dev=dev->next) {
3802                 if ((idev = __in6_dev_get(dev)) == NULL)
3803                         continue;
3804                 addrconf_ifdown(dev, 1);
3805         }
3806         addrconf_ifdown(&loopback_dev, 2);
3807
3808         /*
3809          *      Check hash table.
3810          */
3811
3812         write_lock_bh(&addrconf_hash_lock);
3813         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3814                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3815                         struct inet6_ifaddr *bifa;
3816
3817                         bifa = ifa;
3818                         ifa = ifa->lst_next;
3819                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3820                         /* Do not free it; something is wrong.
3821                            Now we can investigate it with debugger.
3822                          */
3823                 }
3824         }
3825         write_unlock_bh(&addrconf_hash_lock);
3826
3827         del_timer(&addr_chk_timer);
3828
3829         rtnl_unlock();
3830
3831 #ifdef CONFIG_IPV6_PRIVACY
3832         crypto_free_tfm(md5_tfm);
3833         md5_tfm = NULL;
3834 #endif
3835
3836 #ifdef CONFIG_PROC_FS
3837         proc_net_remove("if_inet6");
3838 #endif
3839 }