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  */
  39
  40 #include <linux/config.h>
  41 #include <linux/errno.h>
  42 #include <linux/types.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/sched.h>
  46 #include <linux/net.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_arp.h>
  50 #include <linux/if_arcnet.h>
  51 #include <linux/if_infiniband.h>
  52 #include <linux/route.h>
  53 #include <linux/inetdevice.h>
  54 #include <linux/init.h>
  55 #ifdef CONFIG_SYSCTL
  56 #include <linux/sysctl.h>
  57 #endif
  58 #include <linux/delay.h>
  59 #include <linux/notifier.h>
  60 #include <linux/string.h>
  61
  62 #include <net/sock.h>
  63 #include <net/snmp.h>
  64
  65 #include <net/ipv6.h>
  66 #include <net/protocol.h>
  67 #include <net/ndisc.h>
  68 #include <net/ip6_route.h>
  69 #include <net/addrconf.h>
  70 #include <net/tcp.h>
  71 #include <net/ip.h>
  72 #include <linux/if_tunnel.h>
  73 #include <linux/rtnetlink.h>
  74
  75 #ifdef CONFIG_IPV6_PRIVACY
  76 #include <linux/random.h>
  77 #include <linux/crypto.h>
  78 #include <asm/scatterlist.h>
  79 #endif
  80
  81 #include <asm/uaccess.h>
  82
  83 #include <linux/proc_fs.h>
  84 #include <linux/seq_file.h>
  85
  86 /* Set to 3 to get tracing... */
  87 #define ACONF_DEBUG 2
  88
  89 #if ACONF_DEBUG >= 3
  90 #define ADBG(x) printk x
  91 #else
  92 #define ADBG(x)
  93 #endif
  94
  95 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  96 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  97
  98 #ifdef CONFIG_SYSCTL
  99 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 100 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 101 #endif
 102
 103 #ifdef CONFIG_IPV6_PRIVACY
 104 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 105 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 106 static void ipv6_regen_rndid(unsigned long data);
 107
 108 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 109 static struct crypto_tfm *md5_tfm;
 110 static DEFINE_SPINLOCK(md5_tfm_lock);
 111 #endif
 112
 113 static int ipv6_count_addresses(struct inet6_dev *idev);
 114
 115 /*
 116  *      Configured unicast address hash table
 117  */
 118 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 119 static DEFINE_RWLOCK(addrconf_hash_lock);
 120
 121 /* Protects inet6 devices */
 122 DEFINE_RWLOCK(addrconf_lock);
 123
 124 static void addrconf_verify(unsigned long);
 125
 126 static struct timer_list addr_chk_timer =
 127                         TIMER_INITIALIZER(addrconf_verify, 0, 0);
 128 static DEFINE_SPINLOCK(addrconf_verify_lock);
 129
 130 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 131 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 132
 133 static int addrconf_ifdown(struct net_device *dev, int how);
 134
 135 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 136 static void addrconf_dad_timer(unsigned long data);
 137 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 138 static void addrconf_rs_timer(unsigned long data);
 139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 141
 142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 143                                 struct prefix_info *pinfo);
 144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 145
 146 static struct notifier_block *inet6addr_chain;
 147
 148 struct ipv6_devconf ipv6_devconf = {
 149         .forwarding             = 0,
 150         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 151         .mtu6                   = IPV6_MIN_MTU,
 152         .accept_ra              = 1,
 153         .accept_redirects       = 1,
 154         .autoconf               = 1,
 155         .force_mld_version      = 0,
 156         .dad_transmits          = 1,
 157         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 158         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 159         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 160 #ifdef CONFIG_IPV6_PRIVACY
 161         .use_tempaddr           = 0,
 162         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 163         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 164         .regen_max_retry        = REGEN_MAX_RETRY,
 165         .max_desync_factor      = MAX_DESYNC_FACTOR,
 166 #endif
 167         .max_addresses          = IPV6_MAX_ADDRESSES,
 168 };
 169
 170 static struct ipv6_devconf ipv6_devconf_dflt = {
 171         .forwarding             = 0,
 172         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 173         .mtu6                   = IPV6_MIN_MTU,
 174         .accept_ra              = 1,
 175         .accept_redirects       = 1,
 176         .autoconf               = 1,
 177         .dad_transmits          = 1,
 178         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 179         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 180         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 181 #ifdef CONFIG_IPV6_PRIVACY
 182         .use_tempaddr           = 0,
 183         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 184         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 185         .regen_max_retry        = REGEN_MAX_RETRY,
 186         .max_desync_factor      = MAX_DESYNC_FACTOR,
 187 #endif
 188         .max_addresses          = IPV6_MAX_ADDRESSES,
 189 };
 190
 191 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 192 #if 0
 193 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 194 #endif
 195 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 196
 197 int ipv6_addr_type(const struct in6_addr *addr)
 198 {
 199         int type;
 200         u32 st;
 201
 202         st = addr->s6_addr32[0];
 203
 204         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 205                 type = IPV6_ADDR_MULTICAST;
 206
 207                 switch((st & htonl(0x00FF0000))) {
 208                         case __constant_htonl(0x00010000):
 209                                 type |= IPV6_ADDR_LOOPBACK;
 210                                 break;
 211
 212                         case __constant_htonl(0x00020000):
 213                                 type |= IPV6_ADDR_LINKLOCAL;
 214                                 break;
 215
 216                         case __constant_htonl(0x00050000):
 217                                 type |= IPV6_ADDR_SITELOCAL;
 218                                 break;
 219                 };
 220                 return type;
 221         }
 222
 223         type = IPV6_ADDR_UNICAST;
 224
 225         /* Consider all addresses with the first three bits different of
 226            000 and 111 as finished.
 227          */
 228         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 229             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 230                 return type;
 231
 232         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 233                 return (IPV6_ADDR_LINKLOCAL | type);
 234
 235         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 236                 return (IPV6_ADDR_SITELOCAL | type);
 237
 238         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 239                 if (addr->s6_addr32[2] == 0) {
 240                         if (addr->s6_addr32[3] == 0)
 241                                 return IPV6_ADDR_ANY;
 242
 243                         if (addr->s6_addr32[3] == htonl(0x00000001))
 244                                 return (IPV6_ADDR_LOOPBACK | type);
 245
 246                         return (IPV6_ADDR_COMPATv4 | type);
 247                 }
 248
 249                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 250                         return IPV6_ADDR_MAPPED;
 251         }
 252
 253         st &= htonl(0xFF000000);
 254         if (st == 0)
 255                 return IPV6_ADDR_RESERVED;
 256         st &= htonl(0xFE000000);
 257         if (st == htonl(0x02000000))
 258                 return IPV6_ADDR_RESERVED;      /* for NSAP */
 259         if (st == htonl(0x04000000))
 260                 return IPV6_ADDR_RESERVED;      /* for IPX */
 261         return type;
 262 }
 263
 264 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 265 {
 266         if (del_timer(&ifp->timer))
 267                 __in6_ifa_put(ifp);
 268 }
 269
 270 enum addrconf_timer_t
 271 {
 272         AC_NONE,
 273         AC_DAD,
 274         AC_RS,
 275 };
 276
 277 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 278                                enum addrconf_timer_t what,
 279                                unsigned long when)
 280 {
 281         if (!del_timer(&ifp->timer))
 282                 in6_ifa_hold(ifp);
 283
 284         switch (what) {
 285         case AC_DAD:
 286                 ifp->timer.function = addrconf_dad_timer;
 287                 break;
 288         case AC_RS:
 289                 ifp->timer.function = addrconf_rs_timer;
 290                 break;
 291         default:;
 292         }
 293         ifp->timer.expires = jiffies + when;
 294         add_timer(&ifp->timer);
 295 }
 296
 297 /* Nobody refers to this device, we may destroy it. */
 298
 299 void in6_dev_finish_destroy(struct inet6_dev *idev)
 300 {
 301         struct net_device *dev = idev->dev;
 302         BUG_TRAP(idev->addr_list==NULL);
 303         BUG_TRAP(idev->mc_list==NULL);
 304 #ifdef NET_REFCNT_DEBUG
 305         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 306 #endif
 307         dev_put(dev);
 308         if (!idev->dead) {
 309                 printk("Freeing alive inet6 device %p\n", idev);
 310                 return;
 311         }
 312         snmp6_free_dev(idev);
 313         kfree(idev);
 314 }
 315
 316 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 317 {
 318         struct inet6_dev *ndev;
 319
 320         ASSERT_RTNL();
 321
 322         if (dev->mtu < IPV6_MIN_MTU)
 323                 return NULL;
 324
 325         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 326
 327         if (ndev) {
 328                 memset(ndev, 0, sizeof(struct inet6_dev));
 329
 330                 rwlock_init(&ndev->lock);
 331                 ndev->dev = dev;
 332                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 333                 ndev->cnf.mtu6 = dev->mtu;
 334                 ndev->cnf.sysctl = NULL;
 335                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 336                 if (ndev->nd_parms == NULL) {
 337                         kfree(ndev);
 338                         return NULL;
 339                 }
 340                 /* We refer to the device */
 341                 dev_hold(dev);
 342
 343                 if (snmp6_alloc_dev(ndev) < 0) {
 344                         ADBG((KERN_WARNING
 345                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
 346                                 __FUNCTION__, dev->name));
 347                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 348                         ndev->dead = 1;
 349                         in6_dev_finish_destroy(ndev);
 350                         return NULL;
 351                 }
 352
 353                 if (snmp6_register_dev(ndev) < 0) {
 354                         ADBG((KERN_WARNING
 355                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 356                                 __FUNCTION__, dev->name));
 357                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 358                         ndev->dead = 1;
 359                         in6_dev_finish_destroy(ndev);
 360                         return NULL;
 361                 }
 362
 363                 /* One reference from device.  We must do this before
 364                  * we invoke __ipv6_regen_rndid().
 365                  */
 366                 in6_dev_hold(ndev);
 367
 368 #ifdef CONFIG_IPV6_PRIVACY
 369                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
 370                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
 371                 init_timer(&ndev->regen_timer);
 372                 ndev->regen_timer.function = ipv6_regen_rndid;
 373                 ndev->regen_timer.data = (unsigned long) ndev;
 374                 if ((dev->flags&IFF_LOOPBACK) ||
 375                     dev->type == ARPHRD_TUNNEL ||
 376                     dev->type == ARPHRD_NONE ||
 377                     dev->type == ARPHRD_SIT) {
 378                         printk(KERN_INFO
 379                                 "Disabled Privacy Extensions on device %p(%s)\n",
 380                                 dev, dev->name);
 381                         ndev->cnf.use_tempaddr = -1;
 382                 } else {
 383                         in6_dev_hold(ndev);
 384                         ipv6_regen_rndid((unsigned long) ndev);
 385                 }
 386 #endif
 387
 388                 write_lock_bh(&addrconf_lock);
 389                 dev->ip6_ptr = ndev;
 390                 write_unlock_bh(&addrconf_lock);
 391
 392                 ipv6_mc_init_dev(ndev);
 393                 ndev->tstamp = jiffies;
 394 #ifdef CONFIG_SYSCTL
 395                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 396                                       NET_IPV6_NEIGH, "ipv6",
 397                                       &ndisc_ifinfo_sysctl_change,
 398                                       NULL);
 399                 addrconf_sysctl_register(ndev, &ndev->cnf);
 400 #endif
 401         }
 402         return ndev;
 403 }
 404
 405 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 406 {
 407         struct inet6_dev *idev;
 408
 409         ASSERT_RTNL();
 410
 411         if ((idev = __in6_dev_get(dev)) == NULL) {
 412                 if ((idev = ipv6_add_dev(dev)) == NULL)
 413                         return NULL;
 414         }
 415         if (dev->flags&IFF_UP)
 416                 ipv6_mc_up(idev);
 417         return idev;
 418 }
 419
 420 #ifdef CONFIG_SYSCTL
 421 static void dev_forward_change(struct inet6_dev *idev)
 422 {
 423         struct net_device *dev;
 424         struct inet6_ifaddr *ifa;
 425         struct in6_addr addr;
 426
 427         if (!idev)
 428                 return;
 429         dev = idev->dev;
 430         if (dev && (dev->flags & IFF_MULTICAST)) {
 431                 ipv6_addr_all_routers(&addr);
 432
 433                 if (idev->cnf.forwarding)
 434                         ipv6_dev_mc_inc(dev, &addr);
 435                 else
 436                         ipv6_dev_mc_dec(dev, &addr);
 437         }
 438         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 439                 if (idev->cnf.forwarding)
 440                         addrconf_join_anycast(ifa);
 441                 else
 442                         addrconf_leave_anycast(ifa);
 443         }
 444 }
 445
 446
 447 static void addrconf_forward_change(void)
 448 {
 449         struct net_device *dev;
 450         struct inet6_dev *idev;
 451
 452         read_lock(&dev_base_lock);
 453         for (dev=dev_base; dev; dev=dev->next) {
 454                 read_lock(&addrconf_lock);
 455                 idev = __in6_dev_get(dev);
 456                 if (idev) {
 457                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 458                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 459                         if (changed)
 460                                 dev_forward_change(idev);
 461                 }
 462                 read_unlock(&addrconf_lock);
 463         }
 464         read_unlock(&dev_base_lock);
 465 }
 466 #endif
 467
 468 /* Nobody refers to this ifaddr, destroy it */
 469
 470 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 471 {
 472         BUG_TRAP(ifp->if_next==NULL);
 473         BUG_TRAP(ifp->lst_next==NULL);
 474 #ifdef NET_REFCNT_DEBUG
 475         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 476 #endif
 477
 478         in6_dev_put(ifp->idev);
 479
 480         if (del_timer(&ifp->timer))
 481                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 482
 483         if (!ifp->dead) {
 484                 printk("Freeing alive inet6 address %p\n", ifp);
 485                 return;
 486         }
 487         dst_release(&ifp->rt->u.dst);
 488
 489         kfree(ifp);
 490 }
 491
 492 /* On success it returns ifp with increased reference count */
 493
 494 static struct inet6_ifaddr *
 495 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 496               int scope, u32 flags)
 497 {
 498         struct inet6_ifaddr *ifa = NULL;
 499         struct rt6_info *rt;
 500         int hash;
 501         int err = 0;
 502
 503         read_lock_bh(&addrconf_lock);
 504         if (idev->dead) {
 505                 err = -ENODEV;                  /*XXX*/
 506                 goto out2;
 507         }
 508
 509         write_lock(&addrconf_hash_lock);
 510
 511         /* Ignore adding duplicate addresses on an interface */
 512         if (ipv6_chk_same_addr(addr, idev->dev)) {
 513                 ADBG(("ipv6_add_addr: already assigned\n"));
 514                 err = -EEXIST;
 515                 goto out;
 516         }
 517
 518         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 519
 520         if (ifa == NULL) {
 521                 ADBG(("ipv6_add_addr: malloc failed\n"));
 522                 err = -ENOBUFS;
 523                 goto out;
 524         }
 525
 526         rt = addrconf_dst_alloc(idev, addr, 0);
 527         if (IS_ERR(rt)) {
 528                 err = PTR_ERR(rt);
 529                 goto out;
 530         }
 531
 532         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 533         ipv6_addr_copy(&ifa->addr, addr);
 534
 535         spin_lock_init(&ifa->lock);
 536         init_timer(&ifa->timer);
 537         ifa->timer.data = (unsigned long) ifa;
 538         ifa->scope = scope;
 539         ifa->prefix_len = pfxlen;
 540         ifa->flags = flags | IFA_F_TENTATIVE;
 541         ifa->cstamp = ifa->tstamp = jiffies;
 542
 543         ifa->idev = idev;
 544         in6_dev_hold(idev);
 545         /* For caller */
 546         in6_ifa_hold(ifa);
 547
 548         /* Add to big hash table */
 549         hash = ipv6_addr_hash(addr);
 550
 551         ifa->lst_next = inet6_addr_lst[hash];
 552         inet6_addr_lst[hash] = ifa;
 553         in6_ifa_hold(ifa);
 554         write_unlock(&addrconf_hash_lock);
 555
 556         write_lock(&idev->lock);
 557         /* Add to inet6_dev unicast addr list. */
 558         ifa->if_next = idev->addr_list;
 559         idev->addr_list = ifa;
 560
 561 #ifdef CONFIG_IPV6_PRIVACY
 562         if (ifa->flags&IFA_F_TEMPORARY) {
 563                 ifa->tmp_next = idev->tempaddr_list;
 564                 idev->tempaddr_list = ifa;
 565                 in6_ifa_hold(ifa);
 566         }
 567 #endif
 568
 569         ifa->rt = rt;
 570
 571         in6_ifa_hold(ifa);
 572         write_unlock(&idev->lock);
 573 out2:
 574         read_unlock_bh(&addrconf_lock);
 575
 576         if (likely(err == 0))
 577                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 578         else {
 579                 kfree(ifa);
 580                 ifa = ERR_PTR(err);
 581         }
 582
 583         return ifa;
 584 out:
 585         write_unlock(&addrconf_hash_lock);
 586         goto out2;
 587 }
 588
 589 /* This function wants to get referenced ifp and releases it before return */
 590
 591 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 592 {
 593         struct inet6_ifaddr *ifa, **ifap;
 594         struct inet6_dev *idev = ifp->idev;
 595         int hash;
 596         int deleted = 0, onlink = 0;
 597         unsigned long expires = jiffies;
 598
 599         hash = ipv6_addr_hash(&ifp->addr);
 600
 601         ifp->dead = 1;
 602
 603         write_lock_bh(&addrconf_hash_lock);
 604         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 605              ifap = &ifa->lst_next) {
 606                 if (ifa == ifp) {
 607                         *ifap = ifa->lst_next;
 608                         __in6_ifa_put(ifp);
 609                         ifa->lst_next = NULL;
 610                         break;
 611                 }
 612         }
 613         write_unlock_bh(&addrconf_hash_lock);
 614
 615         write_lock_bh(&idev->lock);
 616 #ifdef CONFIG_IPV6_PRIVACY
 617         if (ifp->flags&IFA_F_TEMPORARY) {
 618                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 619                      ifap = &ifa->tmp_next) {
 620                         if (ifa == ifp) {
 621                                 *ifap = ifa->tmp_next;
 622                                 if (ifp->ifpub) {
 623                                         in6_ifa_put(ifp->ifpub);
 624                                         ifp->ifpub = NULL;
 625                                 }
 626                                 __in6_ifa_put(ifp);
 627                                 ifa->tmp_next = NULL;
 628                                 break;
 629                         }
 630                 }
 631         }
 632 #endif
 633
 634         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
 635              ifap = &ifa->if_next) {
 636                 if (ifa == ifp) {
 637                         *ifap = ifa->if_next;
 638                         __in6_ifa_put(ifp);
 639                         ifa->if_next = NULL;
 640                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 641                                 break;
 642                         deleted = 1;
 643                 } else if (ifp->flags & IFA_F_PERMANENT) {
 644                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 645                                               ifp->prefix_len)) {
 646                                 if (ifa->flags & IFA_F_PERMANENT) {
 647                                         onlink = 1;
 648                                         if (deleted)
 649                                                 break;
 650                                 } else {
 651                                         unsigned long lifetime;
 652
 653                                         if (!onlink)
 654                                                 onlink = -1;
 655
 656                                         spin_lock(&ifa->lock);
 657                                         lifetime = min_t(unsigned long,
 658                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 659                                         if (time_before(expires,
 660                                                         ifa->tstamp + lifetime * HZ))
 661                                                 expires = ifa->tstamp + lifetime * HZ;
 662                                         spin_unlock(&ifa->lock);
 663                                 }
 664                         }
 665                 }
 666         }
 667         write_unlock_bh(&idev->lock);
 668
 669         ipv6_ifa_notify(RTM_DELADDR, ifp);
 670
 671         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 672
 673         addrconf_del_timer(ifp);
 674
 675         /*
 676          * Purge or update corresponding prefix
 677          *
 678          * 1) we don't purge prefix here if address was not permanent.
 679          *    prefix is managed by its own lifetime.
 680          * 2) if there're no addresses, delete prefix.
 681          * 3) if there're still other permanent address(es),
 682          *    corresponding prefix is still permanent.
 683          * 4) otherwise, update prefix lifetime to the
 684          *    longest valid lifetime among the corresponding
 685          *    addresses on the device.
 686          *    Note: subsequent RA will update lifetime.
 687          *
 688          * --yoshfuji
 689          */
 690         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 691                 struct in6_addr prefix;
 692                 struct rt6_info *rt;
 693
 694                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 695                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 696
 697                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 698                         if (onlink == 0) {
 699                                 ip6_del_rt(rt, NULL, NULL, NULL);
 700                                 rt = NULL;
 701                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 702                                 rt->rt6i_expires = expires;
 703                                 rt->rt6i_flags |= RTF_EXPIRES;
 704                         }
 705                 }
 706                 dst_release(&rt->u.dst);
 707         }
 708
 709         in6_ifa_put(ifp);
 710 }
 711
 712 #ifdef CONFIG_IPV6_PRIVACY
 713 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 714 {
 715         struct inet6_dev *idev = ifp->idev;
 716         struct in6_addr addr, *tmpaddr;
 717         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 718         int tmp_plen;
 719         int ret = 0;
 720         int max_addresses;
 721
 722         write_lock(&idev->lock);
 723         if (ift) {
 724                 spin_lock_bh(&ift->lock);
 725                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 726                 spin_unlock_bh(&ift->lock);
 727                 tmpaddr = &addr;
 728         } else {
 729                 tmpaddr = NULL;
 730         }
 731 retry:
 732         in6_dev_hold(idev);
 733         if (idev->cnf.use_tempaddr <= 0) {
 734                 write_unlock(&idev->lock);
 735                 printk(KERN_INFO
 736                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 737                 in6_dev_put(idev);
 738                 ret = -1;
 739                 goto out;
 740         }
 741         spin_lock_bh(&ifp->lock);
 742         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 743                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 744                 spin_unlock_bh(&ifp->lock);
 745                 write_unlock(&idev->lock);
 746                 printk(KERN_WARNING
 747                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 748                 in6_dev_put(idev);
 749                 ret = -1;
 750                 goto out;
 751         }
 752         in6_ifa_hold(ifp);
 753         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 754         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 755                 spin_unlock_bh(&ifp->lock);
 756                 write_unlock(&idev->lock);
 757                 printk(KERN_WARNING
 758                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 759                 in6_ifa_put(ifp);
 760                 in6_dev_put(idev);
 761                 ret = -1;
 762                 goto out;
 763         }
 764         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 765         tmp_valid_lft = min_t(__u32,
 766                               ifp->valid_lft,
 767                               idev->cnf.temp_valid_lft);
 768         tmp_prefered_lft = min_t(__u32,
 769                                  ifp->prefered_lft,
 770                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 771         tmp_plen = ifp->prefix_len;
 772         max_addresses = idev->cnf.max_addresses;
 773         tmp_cstamp = ifp->cstamp;
 774         tmp_tstamp = ifp->tstamp;
 775         spin_unlock_bh(&ifp->lock);
 776
 777         write_unlock(&idev->lock);
 778         ift = !max_addresses ||
 779               ipv6_count_addresses(idev) < max_addresses ?
 780                 ipv6_add_addr(idev, &addr, tmp_plen,
 781                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 782         if (!ift || IS_ERR(ift)) {
 783                 in6_ifa_put(ifp);
 784                 in6_dev_put(idev);
 785                 printk(KERN_INFO
 786                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 787                 tmpaddr = &addr;
 788                 write_lock(&idev->lock);
 789                 goto retry;
 790         }
 791
 792         spin_lock_bh(&ift->lock);
 793         ift->ifpub = ifp;
 794         ift->valid_lft = tmp_valid_lft;
 795         ift->prefered_lft = tmp_prefered_lft;
 796         ift->cstamp = tmp_cstamp;
 797         ift->tstamp = tmp_tstamp;
 798         spin_unlock_bh(&ift->lock);
 799
 800         addrconf_dad_start(ift, 0);
 801         in6_ifa_put(ift);
 802         in6_dev_put(idev);
 803 out:
 804         return ret;
 805 }
 806 #endif
 807
 808 /*
 809  *      Choose an appropriate source address
 810  *      should do:
 811  *      i)      get an address with an appropriate scope
 812  *      ii)     see if there is a specific route for the destination and use
 813  *              an address of the attached interface
 814  *      iii)    don't use deprecated addresses
 815  */
 816 static int inline ipv6_saddr_pref(const struct inet6_ifaddr *ifp, u8 invpref)
 817 {
 818         int pref;
 819         pref = ifp->flags&IFA_F_DEPRECATED ? 0 : 2;
 820 #ifdef CONFIG_IPV6_PRIVACY
 821         pref |= (ifp->flags^invpref)&IFA_F_TEMPORARY ? 0 : 1;
 822 #endif
 823         return pref;
 824 }
 825
 826 #ifdef CONFIG_IPV6_PRIVACY
 827 #define IPV6_GET_SADDR_MAXSCORE(score)  ((score) == 3)
 828 #else
 829 #define IPV6_GET_SADDR_MAXSCORE(score)  (score)
 830 #endif
 831
 832 int ipv6_dev_get_saddr(struct net_device *dev,
 833                        struct in6_addr *daddr, struct in6_addr *saddr)
 834 {
 835         struct inet6_ifaddr *ifp = NULL;
 836         struct inet6_ifaddr *match = NULL;
 837         struct inet6_dev *idev;
 838         int scope;
 839         int err;
 840         int hiscore = -1, score;
 841
 842         scope = ipv6_addr_scope(daddr);
 843
 844         /*
 845          *      known dev
 846          *      search dev and walk through dev addresses
 847          */
 848
 849         if (dev) {
 850                 if (dev->flags & IFF_LOOPBACK)
 851                         scope = IFA_HOST;
 852
 853                 read_lock(&addrconf_lock);
 854                 idev = __in6_dev_get(dev);
 855                 if (idev) {
 856                         read_lock_bh(&idev->lock);
 857                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 858                                 if (ifp->scope == scope) {
 859                                         if (ifp->flags&IFA_F_TENTATIVE)
 860                                                 continue;
 861 #ifdef CONFIG_IPV6_PRIVACY
 862                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
 863 #else
 864                                         score = ipv6_saddr_pref(ifp, 0);
 865 #endif
 866                                         if (score <= hiscore)
 867                                                 continue;
 868
 869                                         if (match)
 870                                                 in6_ifa_put(match);
 871                                         match = ifp;
 872                                         hiscore = score;
 873                                         in6_ifa_hold(ifp);
 874
 875                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
 876                                                 read_unlock_bh(&idev->lock);
 877                                                 read_unlock(&addrconf_lock);
 878                                                 goto out;
 879                                         }
 880                                 }
 881                         }
 882                         read_unlock_bh(&idev->lock);
 883                 }
 884                 read_unlock(&addrconf_lock);
 885         }
 886
 887         if (scope == IFA_LINK)
 888                 goto out;
 889
 890         /*
 891          *      dev == NULL or search failed for specified dev
 892          */
 893
 894         read_lock(&dev_base_lock);
 895         read_lock(&addrconf_lock);
 896         for (dev = dev_base; dev; dev=dev->next) {
 897                 idev = __in6_dev_get(dev);
 898                 if (idev) {
 899                         read_lock_bh(&idev->lock);
 900                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 901                                 if (ifp->scope == scope) {
 902                                         if (ifp->flags&IFA_F_TENTATIVE)
 903                                                 continue;
 904 #ifdef CONFIG_IPV6_PRIVACY
 905                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
 906 #else
 907                                         score = ipv6_saddr_pref(ifp, 0);
 908 #endif
 909                                         if (score <= hiscore)
 910                                                 continue;
 911
 912                                         if (match)
 913                                                 in6_ifa_put(match);
 914                                         match = ifp;
 915                                         hiscore = score;
 916                                         in6_ifa_hold(ifp);
 917
 918                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
 919                                                 read_unlock_bh(&idev->lock);
 920                                                 goto out_unlock_base;
 921                                         }
 922                                 }
 923                         }
 924                         read_unlock_bh(&idev->lock);
 925                 }
 926         }
 927
 928 out_unlock_base:
 929         read_unlock(&addrconf_lock);
 930         read_unlock(&dev_base_lock);
 931
 932 out:
 933         err = -EADDRNOTAVAIL;
 934         if (match) {
 935                 ipv6_addr_copy(saddr, &match->addr);
 936                 err = 0;
 937                 in6_ifa_put(match);
 938         }
 939
 940         return err;
 941 }
 942
 943
 944 int ipv6_get_saddr(struct dst_entry *dst,
 945                    struct in6_addr *daddr, struct in6_addr *saddr)
 946 {
 947         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
 948 }
 949
 950
 951 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
 952 {
 953         struct inet6_dev *idev;
 954         int err = -EADDRNOTAVAIL;
 955
 956         read_lock(&addrconf_lock);
 957         if ((idev = __in6_dev_get(dev)) != NULL) {
 958                 struct inet6_ifaddr *ifp;
 959
 960                 read_lock_bh(&idev->lock);
 961                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 962                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
 963                                 ipv6_addr_copy(addr, &ifp->addr);
 964                                 err = 0;
 965                                 break;
 966                         }
 967                 }
 968                 read_unlock_bh(&idev->lock);
 969         }
 970         read_unlock(&addrconf_lock);
 971         return err;
 972 }
 973
 974 static int ipv6_count_addresses(struct inet6_dev *idev)
 975 {
 976         int cnt = 0;
 977         struct inet6_ifaddr *ifp;
 978
 979         read_lock_bh(&idev->lock);
 980         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
 981                 cnt++;
 982         read_unlock_bh(&idev->lock);
 983         return cnt;
 984 }
 985
 986 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
 987 {
 988         struct inet6_ifaddr * ifp;
 989         u8 hash = ipv6_addr_hash(addr);
 990
 991         read_lock_bh(&addrconf_hash_lock);
 992         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
 993                 if (ipv6_addr_equal(&ifp->addr, addr) &&
 994                     !(ifp->flags&IFA_F_TENTATIVE)) {
 995                         if (dev == NULL || ifp->idev->dev == dev ||
 996                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
 997                                 break;
 998                 }
 999         }
1000         read_unlock_bh(&addrconf_hash_lock);
1001         return ifp != NULL;
1002 }
1003
1004 static
1005 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1006 {
1007         struct inet6_ifaddr * ifp;
1008         u8 hash = ipv6_addr_hash(addr);
1009
1010         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1011                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1012                         if (dev == NULL || ifp->idev->dev == dev)
1013                                 break;
1014                 }
1015         }
1016         return ifp != NULL;
1017 }
1018
1019 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1020 {
1021         struct inet6_ifaddr * ifp;
1022         u8 hash = ipv6_addr_hash(addr);
1023
1024         read_lock_bh(&addrconf_hash_lock);
1025         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1026                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1027                         if (dev == NULL || ifp->idev->dev == dev ||
1028                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1029                                 in6_ifa_hold(ifp);
1030                                 break;
1031                         }
1032                 }
1033         }
1034         read_unlock_bh(&addrconf_hash_lock);
1035
1036         return ifp;
1037 }
1038
1039 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1040 {
1041         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1042         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1043         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1044         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1045         int sk_ipv6only = ipv6_only_sock(sk);
1046         int sk2_ipv6only = tcp_v6_ipv6only(sk2);
1047         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1048         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1049
1050         if (!sk2_rcv_saddr && !sk_ipv6only)
1051                 return 1;
1052
1053         if (addr_type2 == IPV6_ADDR_ANY &&
1054             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1055                 return 1;
1056
1057         if (addr_type == IPV6_ADDR_ANY &&
1058             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1059                 return 1;
1060
1061         if (sk2_rcv_saddr6 &&
1062             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1063                 return 1;
1064
1065         if (addr_type == IPV6_ADDR_MAPPED &&
1066             !sk2_ipv6only &&
1067             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1068                 return 1;
1069
1070         return 0;
1071 }
1072
1073 /* Gets referenced address, destroys ifaddr */
1074
1075 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1076 {
1077         if (net_ratelimit())
1078                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1079         if (ifp->flags&IFA_F_PERMANENT) {
1080                 spin_lock_bh(&ifp->lock);
1081                 addrconf_del_timer(ifp);
1082                 ifp->flags |= IFA_F_TENTATIVE;
1083                 spin_unlock_bh(&ifp->lock);
1084                 in6_ifa_put(ifp);
1085 #ifdef CONFIG_IPV6_PRIVACY
1086         } else if (ifp->flags&IFA_F_TEMPORARY) {
1087                 struct inet6_ifaddr *ifpub;
1088                 spin_lock_bh(&ifp->lock);
1089                 ifpub = ifp->ifpub;
1090                 if (ifpub) {
1091                         in6_ifa_hold(ifpub);
1092                         spin_unlock_bh(&ifp->lock);
1093                         ipv6_create_tempaddr(ifpub, ifp);
1094                         in6_ifa_put(ifpub);
1095                 } else {
1096                         spin_unlock_bh(&ifp->lock);
1097                 }
1098                 ipv6_del_addr(ifp);
1099 #endif
1100         } else
1101                 ipv6_del_addr(ifp);
1102 }
1103
1104
1105 /* Join to solicited addr multicast group. */
1106
1107 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1108 {
1109         struct in6_addr maddr;
1110
1111         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1112                 return;
1113
1114         addrconf_addr_solict_mult(addr, &maddr);
1115         ipv6_dev_mc_inc(dev, &maddr);
1116 }
1117
1118 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1119 {
1120         struct in6_addr maddr;
1121
1122         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1123                 return;
1124
1125         addrconf_addr_solict_mult(addr, &maddr);
1126         __ipv6_dev_mc_dec(idev, &maddr);
1127 }
1128
1129 void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1130 {
1131         struct in6_addr addr;
1132         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1133         if (ipv6_addr_any(&addr))
1134                 return;
1135         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1136 }
1137
1138 void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1139 {
1140         struct in6_addr addr;
1141         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1142         if (ipv6_addr_any(&addr))
1143                 return;
1144         __ipv6_dev_ac_dec(ifp->idev, &addr);
1145 }
1146
1147 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1148 {
1149         switch (dev->type) {
1150         case ARPHRD_ETHER:
1151         case ARPHRD_FDDI:
1152         case ARPHRD_IEEE802_TR:
1153                 if (dev->addr_len != ETH_ALEN)
1154                         return -1;
1155                 memcpy(eui, dev->dev_addr, 3);
1156                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1157
1158                 /*
1159                  * The zSeries OSA network cards can be shared among various
1160                  * OS instances, but the OSA cards have only one MAC address.
1161                  * This leads to duplicate address conflicts in conjunction
1162                  * with IPv6 if more than one instance uses the same card.
1163                  *
1164                  * The driver for these cards can deliver a unique 16-bit
1165                  * identifier for each instance sharing the same card.  It is
1166                  * placed instead of 0xFFFE in the interface identifier.  The
1167                  * "u" bit of the interface identifier is not inverted in this
1168                  * case.  Hence the resulting interface identifier has local
1169                  * scope according to RFC2373.
1170                  */
1171                 if (dev->dev_id) {
1172                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1173                         eui[4] = dev->dev_id & 0xFF;
1174                 } else {
1175                         eui[3] = 0xFF;
1176                         eui[4] = 0xFE;
1177                         eui[0] ^= 2;
1178                 }
1179                 return 0;
1180         case ARPHRD_ARCNET:
1181                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1182                 if (dev->addr_len != ARCNET_ALEN)
1183                         return -1;
1184                 memset(eui, 0, 7);
1185                 eui[7] = *(u8*)dev->dev_addr;
1186                 return 0;
1187         case ARPHRD_INFINIBAND:
1188                 if (dev->addr_len != INFINIBAND_ALEN)
1189                         return -1;
1190                 memcpy(eui, dev->dev_addr + 12, 8);
1191                 eui[0] |= 2;
1192                 return 0;
1193         }
1194         return -1;
1195 }
1196
1197 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1198 {
1199         int err = -1;
1200         struct inet6_ifaddr *ifp;
1201
1202         read_lock_bh(&idev->lock);
1203         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1204                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1205                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1206                         err = 0;
1207                         break;
1208                 }
1209         }
1210         read_unlock_bh(&idev->lock);
1211         return err;
1212 }
1213
1214 #ifdef CONFIG_IPV6_PRIVACY
1215 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1216 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1217 {
1218         struct net_device *dev;
1219         struct scatterlist sg[2];
1220
1221         sg[0].page = virt_to_page(idev->entropy);
1222         sg[0].offset = offset_in_page(idev->entropy);
1223         sg[0].length = 8;
1224         sg[1].page = virt_to_page(idev->work_eui64);
1225         sg[1].offset = offset_in_page(idev->work_eui64);
1226         sg[1].length = 8;
1227
1228         dev = idev->dev;
1229
1230         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1231                 printk(KERN_INFO
1232                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1233                         idev);
1234                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1235         }
1236 regen:
1237         spin_lock(&md5_tfm_lock);
1238         if (unlikely(md5_tfm == NULL)) {
1239                 spin_unlock(&md5_tfm_lock);
1240                 return -1;
1241         }
1242         crypto_digest_init(md5_tfm);
1243         crypto_digest_update(md5_tfm, sg, 2);
1244         crypto_digest_final(md5_tfm, idev->work_digest);
1245         spin_unlock(&md5_tfm_lock);
1246
1247         memcpy(idev->rndid, &idev->work_digest[0], 8);
1248         idev->rndid[0] &= ~0x02;
1249         memcpy(idev->entropy, &idev->work_digest[8], 8);
1250
1251         /*
1252          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1253          * check if generated address is not inappropriate
1254          *
1255          *  - Reserved subnet anycast (RFC 2526)
1256          *      11111101 11....11 1xxxxxxx
1257          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1258          *      00-00-5E-FE-xx-xx-xx-xx
1259          *  - value 0
1260          *  - XXX: already assigned to an address on the device
1261          */
1262         if (idev->rndid[0] == 0xfd &&
1263             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1264             (idev->rndid[7]&0x80))
1265                 goto regen;
1266         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1267                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1268                         goto regen;
1269                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1270                         goto regen;
1271         }
1272
1273         return 0;
1274 }
1275
1276 static void ipv6_regen_rndid(unsigned long data)
1277 {
1278         struct inet6_dev *idev = (struct inet6_dev *) data;
1279         unsigned long expires;
1280
1281         read_lock_bh(&addrconf_lock);
1282         write_lock_bh(&idev->lock);
1283
1284         if (idev->dead)
1285                 goto out;
1286
1287         if (__ipv6_regen_rndid(idev) < 0)
1288                 goto out;
1289
1290         expires = jiffies +
1291                 idev->cnf.temp_prefered_lft * HZ -
1292                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1293         if (time_before(expires, jiffies)) {
1294                 printk(KERN_WARNING
1295                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1296                         idev->dev->name);
1297                 goto out;
1298         }
1299
1300         if (!mod_timer(&idev->regen_timer, expires))
1301                 in6_dev_hold(idev);
1302
1303 out:
1304         write_unlock_bh(&idev->lock);
1305         read_unlock_bh(&addrconf_lock);
1306         in6_dev_put(idev);
1307 }
1308
1309 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1310         int ret = 0;
1311
1312         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1313                 ret = __ipv6_regen_rndid(idev);
1314         return ret;
1315 }
1316 #endif
1317
1318 /*
1319  *      Add prefix route.
1320  */
1321
1322 static void
1323 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1324                       unsigned long expires, u32 flags)
1325 {
1326         struct in6_rtmsg rtmsg;
1327
1328         memset(&rtmsg, 0, sizeof(rtmsg));
1329         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1330         rtmsg.rtmsg_dst_len = plen;
1331         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1332         rtmsg.rtmsg_ifindex = dev->ifindex;
1333         rtmsg.rtmsg_info = expires;
1334         rtmsg.rtmsg_flags = RTF_UP|flags;
1335         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1336
1337         /* Prevent useless cloning on PtP SIT.
1338            This thing is done here expecting that the whole
1339            class of non-broadcast devices need not cloning.
1340          */
1341         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1342                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1343
1344         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1345 }
1346
1347 /* Create "default" multicast route to the interface */
1348
1349 static void addrconf_add_mroute(struct net_device *dev)
1350 {
1351         struct in6_rtmsg rtmsg;
1352
1353         memset(&rtmsg, 0, sizeof(rtmsg));
1354         ipv6_addr_set(&rtmsg.rtmsg_dst,
1355                       htonl(0xFF000000), 0, 0, 0);
1356         rtmsg.rtmsg_dst_len = 8;
1357         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1358         rtmsg.rtmsg_ifindex = dev->ifindex;
1359         rtmsg.rtmsg_flags = RTF_UP;
1360         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1361         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1362 }
1363
1364 static void sit_route_add(struct net_device *dev)
1365 {
1366         struct in6_rtmsg rtmsg;
1367
1368         memset(&rtmsg, 0, sizeof(rtmsg));
1369
1370         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1371         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1372
1373         /* prefix length - 96 bits "::d.d.d.d" */
1374         rtmsg.rtmsg_dst_len     = 96;
1375         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1376         rtmsg.rtmsg_ifindex     = dev->ifindex;
1377
1378         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1379 }
1380
1381 static void addrconf_add_lroute(struct net_device *dev)
1382 {
1383         struct in6_addr addr;
1384
1385         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1386         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1387 }
1388
1389 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1390 {
1391         struct inet6_dev *idev;
1392
1393         ASSERT_RTNL();
1394
1395         if ((idev = ipv6_find_idev(dev)) == NULL)
1396                 return NULL;
1397
1398         /* Add default multicast route */
1399         addrconf_add_mroute(dev);
1400
1401         /* Add link local route */
1402         addrconf_add_lroute(dev);
1403         return idev;
1404 }
1405
1406 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1407 {
1408         struct prefix_info *pinfo;
1409         __u32 valid_lft;
1410         __u32 prefered_lft;
1411         int addr_type;
1412         unsigned long rt_expires;
1413         struct inet6_dev *in6_dev;
1414
1415         pinfo = (struct prefix_info *) opt;
1416
1417         if (len < sizeof(struct prefix_info)) {
1418                 ADBG(("addrconf: prefix option too short\n"));
1419                 return;
1420         }
1421
1422         /*
1423          *      Validation checks ([ADDRCONF], page 19)
1424          */
1425
1426         addr_type = ipv6_addr_type(&pinfo->prefix);
1427
1428         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1429                 return;
1430
1431         valid_lft = ntohl(pinfo->valid);
1432         prefered_lft = ntohl(pinfo->prefered);
1433
1434         if (prefered_lft > valid_lft) {
1435                 if (net_ratelimit())
1436                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1437                 return;
1438         }
1439
1440         in6_dev = in6_dev_get(dev);
1441
1442         if (in6_dev == NULL) {
1443                 if (net_ratelimit())
1444                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1445                 return;
1446         }
1447
1448         /*
1449          *      Two things going on here:
1450          *      1) Add routes for on-link prefixes
1451          *      2) Configure prefixes with the auto flag set
1452          */
1453
1454         /* Avoid arithmetic overflow. Really, we could
1455            save rt_expires in seconds, likely valid_lft,
1456            but it would require division in fib gc, that it
1457            not good.
1458          */
1459         if (valid_lft >= 0x7FFFFFFF/HZ)
1460                 rt_expires = 0;
1461         else
1462                 rt_expires = jiffies + valid_lft * HZ;
1463
1464         if (pinfo->onlink) {
1465                 struct rt6_info *rt;
1466                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1467
1468                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1469                         if (rt->rt6i_flags&RTF_EXPIRES) {
1470                                 if (valid_lft == 0) {
1471                                         ip6_del_rt(rt, NULL, NULL, NULL);
1472                                         rt = NULL;
1473                                 } else {
1474                                         rt->rt6i_expires = rt_expires;
1475                                 }
1476                         }
1477                 } else if (valid_lft) {
1478                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1479                                               dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1480                 }
1481                 if (rt)
1482                         dst_release(&rt->u.dst);
1483         }
1484
1485         /* Try to figure out our local address for this prefix */
1486
1487         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1488                 struct inet6_ifaddr * ifp;
1489                 struct in6_addr addr;
1490                 int create = 0, update_lft = 0;
1491
1492                 if (pinfo->prefix_len == 64) {
1493                         memcpy(&addr, &pinfo->prefix, 8);
1494                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1495                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1496                                 in6_dev_put(in6_dev);
1497                                 return;
1498                         }
1499                         goto ok;
1500                 }
1501                 if (net_ratelimit())
1502                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1503                                pinfo->prefix_len);
1504                 in6_dev_put(in6_dev);
1505                 return;
1506
1507 ok:
1508
1509                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1510
1511                 if (ifp == NULL && valid_lft) {
1512                         int max_addresses = in6_dev->cnf.max_addresses;
1513
1514                         /* Do not allow to create too much of autoconfigured
1515                          * addresses; this would be too easy way to crash kernel.
1516                          */
1517                         if (!max_addresses ||
1518                             ipv6_count_addresses(in6_dev) < max_addresses)
1519                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1520                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1521
1522                         if (!ifp || IS_ERR(ifp)) {
1523                                 in6_dev_put(in6_dev);
1524                                 return;
1525                         }
1526
1527                         update_lft = create = 1;
1528                         ifp->cstamp = jiffies;
1529                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1530                 }
1531
1532                 if (ifp) {
1533                         int flags;
1534                         unsigned long now;
1535 #ifdef CONFIG_IPV6_PRIVACY
1536                         struct inet6_ifaddr *ift;
1537 #endif
1538                         u32 stored_lft;
1539
1540                         /* update lifetime (RFC2462 5.5.3 e) */
1541                         spin_lock(&ifp->lock);
1542                         now = jiffies;
1543                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1544                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1545                         else
1546                                 stored_lft = 0;
1547                         if (!update_lft && stored_lft) {
1548                                 if (valid_lft > MIN_VALID_LIFETIME ||
1549                                     valid_lft > stored_lft)
1550                                         update_lft = 1;
1551                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1552                                         /* valid_lft <= stored_lft is always true */
1553                                         /* XXX: IPsec */
1554                                         update_lft = 0;
1555                                 } else {
1556                                         valid_lft = MIN_VALID_LIFETIME;
1557                                         if (valid_lft < prefered_lft)
1558                                                 prefered_lft = valid_lft;
1559                                         update_lft = 1;
1560                                 }
1561                         }
1562
1563                         if (update_lft) {
1564                                 ifp->valid_lft = valid_lft;
1565                                 ifp->prefered_lft = prefered_lft;
1566                                 ifp->tstamp = now;
1567                                 flags = ifp->flags;
1568                                 ifp->flags &= ~IFA_F_DEPRECATED;
1569                                 spin_unlock(&ifp->lock);
1570
1571                                 if (!(flags&IFA_F_TENTATIVE))
1572                                         ipv6_ifa_notify(0, ifp);
1573                         } else
1574                                 spin_unlock(&ifp->lock);
1575
1576 #ifdef CONFIG_IPV6_PRIVACY
1577                         read_lock_bh(&in6_dev->lock);
1578                         /* update all temporary addresses in the list */
1579                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1580                                 /*
1581                                  * When adjusting the lifetimes of an existing
1582                                  * temporary address, only lower the lifetimes.
1583                                  * Implementations must not increase the
1584                                  * lifetimes of an existing temporary address
1585                                  * when processing a Prefix Information Option.
1586                                  */
1587                                 spin_lock(&ift->lock);
1588                                 flags = ift->flags;
1589                                 if (ift->valid_lft > valid_lft &&
1590                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1591                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1592                                 if (ift->prefered_lft > prefered_lft &&
1593                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1594                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1595                                 spin_unlock(&ift->lock);
1596                                 if (!(flags&IFA_F_TENTATIVE))
1597                                         ipv6_ifa_notify(0, ift);
1598                         }
1599
1600                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1601                                 /*
1602                                  * When a new public address is created as described in [ADDRCONF],
1603                                  * also create a new temporary address.
1604                                  */
1605                                 read_unlock_bh(&in6_dev->lock);
1606                                 ipv6_create_tempaddr(ifp, NULL);
1607                         } else {
1608                                 read_unlock_bh(&in6_dev->lock);
1609                         }
1610 #endif
1611                         in6_ifa_put(ifp);
1612                         addrconf_verify(0);
1613                 }
1614         }
1615         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1616         in6_dev_put(in6_dev);
1617 }
1618
1619 /*
1620  *      Set destination address.
1621  *      Special case for SIT interfaces where we create a new "virtual"
1622  *      device.
1623  */
1624 int addrconf_set_dstaddr(void __user *arg)
1625 {
1626         struct in6_ifreq ireq;
1627         struct net_device *dev;
1628         int err = -EINVAL;
1629
1630         rtnl_lock();
1631
1632         err = -EFAULT;
1633         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1634                 goto err_exit;
1635
1636         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1637
1638         err = -ENODEV;
1639         if (dev == NULL)
1640                 goto err_exit;
1641
1642         if (dev->type == ARPHRD_SIT) {
1643                 struct ifreq ifr;
1644                 mm_segment_t    oldfs;
1645                 struct ip_tunnel_parm p;
1646
1647                 err = -EADDRNOTAVAIL;
1648                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1649                         goto err_exit;
1650
1651                 memset(&p, 0, sizeof(p));
1652                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1653                 p.iph.saddr = 0;
1654                 p.iph.version = 4;
1655                 p.iph.ihl = 5;
1656                 p.iph.protocol = IPPROTO_IPV6;
1657                 p.iph.ttl = 64;
1658                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1659
1660                 oldfs = get_fs(); set_fs(KERNEL_DS);
1661                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1662                 set_fs(oldfs);
1663
1664                 if (err == 0) {
1665                         err = -ENOBUFS;
1666                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1667                                 goto err_exit;
1668                         err = dev_open(dev);
1669                 }
1670         }
1671
1672 err_exit:
1673         rtnl_unlock();
1674         return err;
1675 }
1676
1677 /*
1678  *      Manual configuration of address on an interface
1679  */
1680 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1681 {
1682         struct inet6_ifaddr *ifp;
1683         struct inet6_dev *idev;
1684         struct net_device *dev;
1685         int scope;
1686
1687         ASSERT_RTNL();
1688
1689         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1690                 return -ENODEV;
1691
1692         if (!(dev->flags&IFF_UP))
1693                 return -ENETDOWN;
1694
1695         if ((idev = addrconf_add_dev(dev)) == NULL)
1696                 return -ENOBUFS;
1697
1698         scope = ipv6_addr_scope(pfx);
1699
1700         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1701         if (!IS_ERR(ifp)) {
1702                 addrconf_dad_start(ifp, 0);
1703                 in6_ifa_put(ifp);
1704                 return 0;
1705         }
1706
1707         return PTR_ERR(ifp);
1708 }
1709
1710 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1711 {
1712         struct inet6_ifaddr *ifp;
1713         struct inet6_dev *idev;
1714         struct net_device *dev;
1715
1716         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1717                 return -ENODEV;
1718
1719         if ((idev = __in6_dev_get(dev)) == NULL)
1720                 return -ENXIO;
1721
1722         read_lock_bh(&idev->lock);
1723         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1724                 if (ifp->prefix_len == plen &&
1725                     ipv6_addr_equal(pfx, &ifp->addr)) {
1726                         in6_ifa_hold(ifp);
1727                         read_unlock_bh(&idev->lock);
1728
1729                         ipv6_del_addr(ifp);
1730
1731                         /* If the last address is deleted administratively,
1732                            disable IPv6 on this interface.
1733                          */
1734                         if (idev->addr_list == NULL)
1735                                 addrconf_ifdown(idev->dev, 1);
1736                         return 0;
1737                 }
1738         }
1739         read_unlock_bh(&idev->lock);
1740         return -EADDRNOTAVAIL;
1741 }
1742
1743
1744 int addrconf_add_ifaddr(void __user *arg)
1745 {
1746         struct in6_ifreq ireq;
1747         int err;
1748
1749         if (!capable(CAP_NET_ADMIN))
1750                 return -EPERM;
1751
1752         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1753                 return -EFAULT;
1754
1755         rtnl_lock();
1756         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1757         rtnl_unlock();
1758         return err;
1759 }
1760
1761 int addrconf_del_ifaddr(void __user *arg)
1762 {
1763         struct in6_ifreq ireq;
1764         int err;
1765
1766         if (!capable(CAP_NET_ADMIN))
1767                 return -EPERM;
1768
1769         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1770                 return -EFAULT;
1771
1772         rtnl_lock();
1773         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1774         rtnl_unlock();
1775         return err;
1776 }
1777
1778 static void sit_add_v4_addrs(struct inet6_dev *idev)
1779 {
1780         struct inet6_ifaddr * ifp;
1781         struct in6_addr addr;
1782         struct net_device *dev;
1783         int scope;
1784
1785         ASSERT_RTNL();
1786
1787         memset(&addr, 0, sizeof(struct in6_addr));
1788         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1789
1790         if (idev->dev->flags&IFF_POINTOPOINT) {
1791                 addr.s6_addr32[0] = htonl(0xfe800000);
1792                 scope = IFA_LINK;
1793         } else {
1794                 scope = IPV6_ADDR_COMPATv4;
1795         }
1796
1797         if (addr.s6_addr32[3]) {
1798                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1799                 if (!IS_ERR(ifp)) {
1800                         spin_lock_bh(&ifp->lock);
1801                         ifp->flags &= ~IFA_F_TENTATIVE;
1802                         spin_unlock_bh(&ifp->lock);
1803                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1804                         in6_ifa_put(ifp);
1805                 }
1806                 return;
1807         }
1808
1809         for (dev = dev_base; dev != NULL; dev = dev->next) {
1810                 struct in_device * in_dev = __in_dev_get(dev);
1811                 if (in_dev && (dev->flags & IFF_UP)) {
1812                         struct in_ifaddr * ifa;
1813
1814                         int flag = scope;
1815
1816                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1817                                 int plen;
1818
1819                                 addr.s6_addr32[3] = ifa->ifa_local;
1820
1821                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1822                                         continue;
1823                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1824                                         if (idev->dev->flags&IFF_POINTOPOINT)
1825                                                 continue;
1826                                         flag |= IFA_HOST;
1827                                 }
1828                                 if (idev->dev->flags&IFF_POINTOPOINT)
1829                                         plen = 64;
1830                                 else
1831                                         plen = 96;
1832
1833                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1834                                                     IFA_F_PERMANENT);
1835                                 if (!IS_ERR(ifp)) {
1836                                         spin_lock_bh(&ifp->lock);
1837                                         ifp->flags &= ~IFA_F_TENTATIVE;
1838                                         spin_unlock_bh(&ifp->lock);
1839                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1840                                         in6_ifa_put(ifp);
1841                                 }
1842                         }
1843                 }
1844         }
1845 }
1846
1847 static void init_loopback(struct net_device *dev)
1848 {
1849         struct inet6_dev  *idev;
1850         struct inet6_ifaddr * ifp;
1851
1852         /* ::1 */
1853
1854         ASSERT_RTNL();
1855
1856         if ((idev = ipv6_find_idev(dev)) == NULL) {
1857                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1858                 return;
1859         }
1860
1861         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1862         if (!IS_ERR(ifp)) {
1863                 spin_lock_bh(&ifp->lock);
1864                 ifp->flags &= ~IFA_F_TENTATIVE;
1865                 spin_unlock_bh(&ifp->lock);
1866                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1867                 in6_ifa_put(ifp);
1868         }
1869 }
1870
1871 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
1872 {
1873         struct inet6_ifaddr * ifp;
1874
1875         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
1876         if (!IS_ERR(ifp)) {
1877                 addrconf_dad_start(ifp, 0);
1878                 in6_ifa_put(ifp);
1879         }
1880 }
1881
1882 static void addrconf_dev_config(struct net_device *dev)
1883 {
1884         struct in6_addr addr;
1885         struct inet6_dev    * idev;
1886
1887         ASSERT_RTNL();
1888
1889         if ((dev->type != ARPHRD_ETHER) &&
1890             (dev->type != ARPHRD_FDDI) &&
1891             (dev->type != ARPHRD_IEEE802_TR) &&
1892             (dev->type != ARPHRD_ARCNET) &&
1893             (dev->type != ARPHRD_INFINIBAND)) {
1894                 /* Alas, we support only Ethernet autoconfiguration. */
1895                 return;
1896         }
1897
1898         idev = addrconf_add_dev(dev);
1899         if (idev == NULL)
1900                 return;
1901
1902         memset(&addr, 0, sizeof(struct in6_addr));
1903         addr.s6_addr32[0] = htonl(0xFE800000);
1904
1905         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
1906                 addrconf_add_linklocal(idev, &addr);
1907 }
1908
1909 static void addrconf_sit_config(struct net_device *dev)
1910 {
1911         struct inet6_dev *idev;
1912
1913         ASSERT_RTNL();
1914
1915         /*
1916          * Configure the tunnel with one of our IPv4
1917          * addresses... we should configure all of
1918          * our v4 addrs in the tunnel
1919          */
1920
1921         if ((idev = ipv6_find_idev(dev)) == NULL) {
1922                 printk(KERN_DEBUG "init sit: add_dev failed\n");
1923                 return;
1924         }
1925
1926         sit_add_v4_addrs(idev);
1927
1928         if (dev->flags&IFF_POINTOPOINT) {
1929                 addrconf_add_mroute(dev);
1930                 addrconf_add_lroute(dev);
1931         } else
1932                 sit_route_add(dev);
1933 }
1934
1935 static inline int
1936 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
1937 {
1938         struct in6_addr lladdr;
1939
1940         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
1941                 addrconf_add_linklocal(idev, &lladdr);
1942                 return 0;
1943         }
1944         return -1;
1945 }
1946
1947 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
1948 {
1949         struct net_device *link_dev;
1950
1951         /* first try to inherit the link-local address from the link device */
1952         if (idev->dev->iflink &&
1953             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
1954                 if (!ipv6_inherit_linklocal(idev, link_dev))
1955                         return;
1956         }
1957         /* then try to inherit it from any device */
1958         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
1959                 if (!ipv6_inherit_linklocal(idev, link_dev))
1960                         return;
1961         }
1962         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
1963 }
1964
1965 /*
1966  * Autoconfigure tunnel with a link-local address so routing protocols,
1967  * DHCPv6, MLD etc. can be run over the virtual link
1968  */
1969
1970 static void addrconf_ip6_tnl_config(struct net_device *dev)
1971 {
1972         struct inet6_dev *idev;
1973
1974         ASSERT_RTNL();
1975
1976         if ((idev = addrconf_add_dev(dev)) == NULL) {
1977                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
1978                 return;
1979         }
1980         ip6_tnl_add_linklocal(idev);
1981         addrconf_add_mroute(dev);
1982 }
1983
1984 static int addrconf_notify(struct notifier_block *this, unsigned long event,
1985                            void * data)
1986 {
1987         struct net_device *dev = (struct net_device *) data;
1988         struct inet6_dev *idev = __in6_dev_get(dev);
1989
1990         switch(event) {
1991         case NETDEV_UP:
1992                 switch(dev->type) {
1993                 case ARPHRD_SIT:
1994                         addrconf_sit_config(dev);
1995                         break;
1996                 case ARPHRD_TUNNEL6:
1997                         addrconf_ip6_tnl_config(dev);
1998                         break;
1999                 case ARPHRD_LOOPBACK:
2000                         init_loopback(dev);
2001                         break;
2002
2003                 default:
2004                         addrconf_dev_config(dev);
2005                         break;
2006                 };
2007                 if (idev) {
2008                         /* If the MTU changed during the interface down, when the
2009                            interface up, the changed MTU must be reflected in the
2010                            idev as well as routers.
2011                          */
2012                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2013                                 rt6_mtu_change(dev, dev->mtu);
2014                                 idev->cnf.mtu6 = dev->mtu;
2015                         }
2016                         idev->tstamp = jiffies;
2017                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2018                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2019                            stop IPv6 on this interface.
2020                          */
2021                         if (dev->mtu < IPV6_MIN_MTU)
2022                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2023                 }
2024                 break;
2025
2026         case NETDEV_CHANGEMTU:
2027                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2028                         rt6_mtu_change(dev, dev->mtu);
2029                         idev->cnf.mtu6 = dev->mtu;
2030                         break;
2031                 }
2032
2033                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2034
2035         case NETDEV_DOWN:
2036         case NETDEV_UNREGISTER:
2037                 /*
2038                  *      Remove all addresses from this interface.
2039                  */
2040                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2041                 break;
2042         case NETDEV_CHANGE:
2043                 break;
2044         case NETDEV_CHANGENAME:
2045 #ifdef CONFIG_SYSCTL
2046                 if (idev) {
2047                         addrconf_sysctl_unregister(&idev->cnf);
2048                         neigh_sysctl_unregister(idev->nd_parms);
2049                         neigh_sysctl_register(dev, idev->nd_parms,
2050                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2051                                               &ndisc_ifinfo_sysctl_change,
2052                                               NULL);
2053                         addrconf_sysctl_register(idev, &idev->cnf);
2054                 }
2055 #endif
2056                 break;
2057         };
2058
2059         return NOTIFY_OK;
2060 }
2061
2062 /*
2063  *      addrconf module should be notified of a device going up
2064  */
2065 static struct notifier_block ipv6_dev_notf = {
2066         .notifier_call = addrconf_notify,
2067         .priority = 0
2068 };
2069
2070 static int addrconf_ifdown(struct net_device *dev, int how)
2071 {
2072         struct inet6_dev *idev;
2073         struct inet6_ifaddr *ifa, **bifa;
2074         int i;
2075
2076         ASSERT_RTNL();
2077
2078         if (dev == &loopback_dev && how == 1)
2079                 how = 0;
2080
2081         rt6_ifdown(dev);
2082         neigh_ifdown(&nd_tbl, dev);
2083
2084         idev = __in6_dev_get(dev);
2085         if (idev == NULL)
2086                 return -ENODEV;
2087
2088         /* Step 1: remove reference to ipv6 device from parent device.
2089                    Do not dev_put!
2090          */
2091         if (how == 1) {
2092                 write_lock_bh(&addrconf_lock);
2093                 dev->ip6_ptr = NULL;
2094                 idev->dead = 1;
2095                 write_unlock_bh(&addrconf_lock);
2096
2097                 /* Step 1.5: remove snmp6 entry */
2098                 snmp6_unregister_dev(idev);
2099
2100         }
2101
2102         /* Step 2: clear hash table */
2103         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2104                 bifa = &inet6_addr_lst[i];
2105
2106                 write_lock_bh(&addrconf_hash_lock);
2107                 while ((ifa = *bifa) != NULL) {
2108                         if (ifa->idev == idev) {
2109                                 *bifa = ifa->lst_next;
2110                                 ifa->lst_next = NULL;
2111                                 addrconf_del_timer(ifa);
2112                                 in6_ifa_put(ifa);
2113                                 continue;
2114                         }
2115                         bifa = &ifa->lst_next;
2116                 }
2117                 write_unlock_bh(&addrconf_hash_lock);
2118         }
2119
2120         write_lock_bh(&idev->lock);
2121
2122         /* Step 3: clear flags for stateless addrconf */
2123         if (how != 1)
2124                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2125
2126         /* Step 4: clear address list */
2127 #ifdef CONFIG_IPV6_PRIVACY
2128         if (how == 1 && del_timer(&idev->regen_timer))
2129                 in6_dev_put(idev);
2130
2131         /* clear tempaddr list */
2132         while ((ifa = idev->tempaddr_list) != NULL) {
2133                 idev->tempaddr_list = ifa->tmp_next;
2134                 ifa->tmp_next = NULL;
2135                 ifa->dead = 1;
2136                 write_unlock_bh(&idev->lock);
2137                 spin_lock_bh(&ifa->lock);
2138
2139                 if (ifa->ifpub) {
2140                         in6_ifa_put(ifa->ifpub);
2141                         ifa->ifpub = NULL;
2142                 }
2143                 spin_unlock_bh(&ifa->lock);
2144                 in6_ifa_put(ifa);
2145                 write_lock_bh(&idev->lock);
2146         }
2147 #endif
2148         while ((ifa = idev->addr_list) != NULL) {
2149                 idev->addr_list = ifa->if_next;
2150                 ifa->if_next = NULL;
2151                 ifa->dead = 1;
2152                 addrconf_del_timer(ifa);
2153                 write_unlock_bh(&idev->lock);
2154
2155                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2156                 in6_ifa_put(ifa);
2157
2158                 write_lock_bh(&idev->lock);
2159         }
2160         write_unlock_bh(&idev->lock);
2161
2162         /* Step 5: Discard multicast list */
2163
2164         if (how == 1)
2165                 ipv6_mc_destroy_dev(idev);
2166         else
2167                 ipv6_mc_down(idev);
2168
2169         /* Step 5: netlink notification of this interface */
2170         idev->tstamp = jiffies;
2171         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2172
2173         /* Shot the device (if unregistered) */
2174
2175         if (how == 1) {
2176 #ifdef CONFIG_SYSCTL
2177                 addrconf_sysctl_unregister(&idev->cnf);
2178                 neigh_sysctl_unregister(idev->nd_parms);
2179 #endif
2180                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2181                 neigh_ifdown(&nd_tbl, dev);
2182                 in6_dev_put(idev);
2183         }
2184         return 0;
2185 }
2186
2187 static void addrconf_rs_timer(unsigned long data)
2188 {
2189         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2190
2191         if (ifp->idev->cnf.forwarding)
2192                 goto out;
2193
2194         if (ifp->idev->if_flags & IF_RA_RCVD) {
2195                 /*
2196                  *      Announcement received after solicitation
2197                  *      was sent
2198                  */
2199                 goto out;
2200         }
2201
2202         spin_lock(&ifp->lock);
2203         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2204                 struct in6_addr all_routers;
2205
2206                 /* The wait after the last probe can be shorter */
2207                 addrconf_mod_timer(ifp, AC_RS,
2208                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2209                                    ifp->idev->cnf.rtr_solicit_delay :
2210                                    ifp->idev->cnf.rtr_solicit_interval);
2211                 spin_unlock(&ifp->lock);
2212
2213                 ipv6_addr_all_routers(&all_routers);
2214
2215                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2216         } else {
2217                 spin_unlock(&ifp->lock);
2218                 /*
2219                  * Note: we do not support deprecated "all on-link"
2220                  * assumption any longer.
2221                  */
2222                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2223                        ifp->idev->dev->name);
2224         }
2225
2226 out:
2227         in6_ifa_put(ifp);
2228 }
2229
2230 /*
2231  *      Duplicate Address Detection
2232  */
2233 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2234 {
2235         struct inet6_dev *idev = ifp->idev;
2236         struct net_device *dev = idev->dev;
2237         unsigned long rand_num;
2238
2239         addrconf_join_solict(dev, &ifp->addr);
2240
2241         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2242                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2243                                         flags);
2244
2245         net_srandom(ifp->addr.s6_addr32[3]);
2246         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2247
2248         read_lock_bh(&idev->lock);
2249         if (ifp->dead)
2250                 goto out;
2251         spin_lock_bh(&ifp->lock);
2252
2253         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2254             !(ifp->flags&IFA_F_TENTATIVE)) {
2255                 ifp->flags &= ~IFA_F_TENTATIVE;
2256                 spin_unlock_bh(&ifp->lock);
2257                 read_unlock_bh(&idev->lock);
2258
2259                 addrconf_dad_completed(ifp);
2260                 return;
2261         }
2262
2263         ifp->probes = idev->cnf.dad_transmits;
2264         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2265
2266         spin_unlock_bh(&ifp->lock);
2267 out:
2268         read_unlock_bh(&idev->lock);
2269 }
2270
2271 static void addrconf_dad_timer(unsigned long data)
2272 {
2273         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2274         struct inet6_dev *idev = ifp->idev;
2275         struct in6_addr unspec;
2276         struct in6_addr mcaddr;
2277
2278         read_lock_bh(&idev->lock);
2279         if (idev->dead) {
2280                 read_unlock_bh(&idev->lock);
2281                 goto out;
2282         }
2283         spin_lock_bh(&ifp->lock);
2284         if (ifp->probes == 0) {
2285                 /*
2286                  * DAD was successful
2287                  */
2288
2289                 ifp->flags &= ~IFA_F_TENTATIVE;
2290                 spin_unlock_bh(&ifp->lock);
2291                 read_unlock_bh(&idev->lock);
2292
2293                 addrconf_dad_completed(ifp);
2294
2295                 goto out;
2296         }
2297
2298         ifp->probes--;
2299         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2300         spin_unlock_bh(&ifp->lock);
2301         read_unlock_bh(&idev->lock);
2302
2303         /* send a neighbour solicitation for our addr */
2304         memset(&unspec, 0, sizeof(unspec));
2305         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2306         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2307 out:
2308         in6_ifa_put(ifp);
2309 }
2310
2311 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2312 {
2313         struct net_device *     dev = ifp->idev->dev;
2314
2315         /*
2316          *      Configure the address for reception. Now it is valid.
2317          */
2318
2319         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2320
2321         /* If added prefix is link local and forwarding is off,
2322            start sending router solicitations.
2323          */
2324
2325         if (ifp->idev->cnf.forwarding == 0 &&
2326             ifp->idev->cnf.rtr_solicits > 0 &&
2327             (dev->flags&IFF_LOOPBACK) == 0 &&
2328             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2329                 struct in6_addr all_routers;
2330
2331                 ipv6_addr_all_routers(&all_routers);
2332
2333                 /*
2334                  *      If a host as already performed a random delay
2335                  *      [...] as part of DAD [...] there is no need
2336                  *      to delay again before sending the first RS
2337                  */
2338                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2339
2340                 spin_lock_bh(&ifp->lock);
2341                 ifp->probes = 1;
2342                 ifp->idev->if_flags |= IF_RS_SENT;
2343                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2344                 spin_unlock_bh(&ifp->lock);
2345         }
2346 }
2347
2348 #ifdef CONFIG_PROC_FS
2349 struct if6_iter_state {
2350         int bucket;
2351 };
2352
2353 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2354 {
2355         struct inet6_ifaddr *ifa = NULL;
2356         struct if6_iter_state *state = seq->private;
2357
2358         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2359                 ifa = inet6_addr_lst[state->bucket];
2360                 if (ifa)
2361                         break;
2362         }
2363         return ifa;
2364 }
2365
2366 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2367 {
2368         struct if6_iter_state *state = seq->private;
2369
2370         ifa = ifa->lst_next;
2371 try_again:
2372         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2373                 ifa = inet6_addr_lst[state->bucket];
2374                 goto try_again;
2375         }
2376         return ifa;
2377 }
2378
2379 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2380 {
2381         struct inet6_ifaddr *ifa = if6_get_first(seq);
2382
2383         if (ifa)
2384                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2385                         --pos;
2386         return pos ? NULL : ifa;
2387 }
2388
2389 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2390 {
2391         read_lock_bh(&addrconf_hash_lock);
2392         return if6_get_idx(seq, *pos);
2393 }
2394
2395 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2396 {
2397         struct inet6_ifaddr *ifa;
2398
2399         ifa = if6_get_next(seq, v);
2400         ++*pos;
2401         return ifa;
2402 }
2403
2404 static void if6_seq_stop(struct seq_file *seq, void *v)
2405 {
2406         read_unlock_bh(&addrconf_hash_lock);
2407 }
2408
2409 static int if6_seq_show(struct seq_file *seq, void *v)
2410 {
2411         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2412         seq_printf(seq,
2413                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2414                    NIP6(ifp->addr),
2415                    ifp->idev->dev->ifindex,
2416                    ifp->prefix_len,
2417                    ifp->scope,
2418                    ifp->flags,
2419                    ifp->idev->dev->name);
2420         return 0;
2421 }
2422
2423 static struct seq_operations if6_seq_ops = {
2424         .start  = if6_seq_start,
2425         .next   = if6_seq_next,
2426         .show   = if6_seq_show,
2427         .stop   = if6_seq_stop,
2428 };
2429
2430 static int if6_seq_open(struct inode *inode, struct file *file)
2431 {
2432         struct seq_file *seq;
2433         int rc = -ENOMEM;
2434         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2435
2436         if (!s)
2437                 goto out;
2438         memset(s, 0, sizeof(*s));
2439
2440         rc = seq_open(file, &if6_seq_ops);
2441         if (rc)
2442                 goto out_kfree;
2443
2444         seq = file->private_data;
2445         seq->private = s;
2446 out:
2447         return rc;
2448 out_kfree:
2449         kfree(s);
2450         goto out;
2451 }
2452
2453 static struct file_operations if6_fops = {
2454         .owner          = THIS_MODULE,
2455         .open           = if6_seq_open,
2456         .read           = seq_read,
2457         .llseek         = seq_lseek,
2458         .release        = seq_release_private,
2459 };
2460
2461 int __init if6_proc_init(void)
2462 {
2463         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2464                 return -ENOMEM;
2465         return 0;
2466 }
2467
2468 void if6_proc_exit(void)
2469 {
2470         proc_net_remove("if_inet6");
2471 }
2472 #endif  /* CONFIG_PROC_FS */
2473
2474 /*
2475  *      Periodic address status verification
2476  */
2477
2478 static void addrconf_verify(unsigned long foo)
2479 {
2480         struct inet6_ifaddr *ifp;
2481         unsigned long now, next;
2482         int i;
2483
2484         spin_lock_bh(&addrconf_verify_lock);
2485         now = jiffies;
2486         next = now + ADDR_CHECK_FREQUENCY;
2487
2488         del_timer(&addr_chk_timer);
2489
2490         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2491
2492 restart:
2493                 write_lock(&addrconf_hash_lock);
2494                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2495                         unsigned long age;
2496 #ifdef CONFIG_IPV6_PRIVACY
2497                         unsigned long regen_advance;
2498 #endif
2499
2500                         if (ifp->flags & IFA_F_PERMANENT)
2501                                 continue;
2502
2503                         spin_lock(&ifp->lock);
2504                         age = (now - ifp->tstamp) / HZ;
2505
2506 #ifdef CONFIG_IPV6_PRIVACY
2507                         regen_advance = ifp->idev->cnf.regen_max_retry *
2508                                         ifp->idev->cnf.dad_transmits *
2509                                         ifp->idev->nd_parms->retrans_time / HZ;
2510 #endif
2511
2512                         if (age >= ifp->valid_lft) {
2513                                 spin_unlock(&ifp->lock);
2514                                 in6_ifa_hold(ifp);
2515                                 write_unlock(&addrconf_hash_lock);
2516                                 ipv6_del_addr(ifp);
2517                                 goto restart;
2518                         } else if (age >= ifp->prefered_lft) {
2519                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2520                                 int deprecate = 0;
2521
2522                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2523                                         deprecate = 1;
2524                                         ifp->flags |= IFA_F_DEPRECATED;
2525                                 }
2526
2527                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2528                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2529
2530                                 spin_unlock(&ifp->lock);
2531
2532                                 if (deprecate) {
2533                                         in6_ifa_hold(ifp);
2534                                         write_unlock(&addrconf_hash_lock);
2535
2536                                         ipv6_ifa_notify(0, ifp);
2537                                         in6_ifa_put(ifp);
2538                                         goto restart;
2539                                 }
2540 #ifdef CONFIG_IPV6_PRIVACY
2541                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2542                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2543                                 if (age >= ifp->prefered_lft - regen_advance) {
2544                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2545                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2546                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2547                                         if (!ifp->regen_count && ifpub) {
2548                                                 ifp->regen_count++;
2549                                                 in6_ifa_hold(ifp);
2550                                                 in6_ifa_hold(ifpub);
2551                                                 spin_unlock(&ifp->lock);
2552                                                 write_unlock(&addrconf_hash_lock);
2553                                                 ipv6_create_tempaddr(ifpub, ifp);
2554                                                 in6_ifa_put(ifpub);
2555                                                 in6_ifa_put(ifp);
2556                                                 goto restart;
2557                                         }
2558                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2559                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2560                                 spin_unlock(&ifp->lock);
2561 #endif
2562                         } else {
2563                                 /* ifp->prefered_lft <= ifp->valid_lft */
2564                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2565                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2566                                 spin_unlock(&ifp->lock);
2567                         }
2568                 }
2569                 write_unlock(&addrconf_hash_lock);
2570         }
2571
2572         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2573         add_timer(&addr_chk_timer);
2574         spin_unlock_bh(&addrconf_verify_lock);
2575 }
2576
2577 static int
2578 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2579 {
2580         struct rtattr **rta = arg;
2581         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2582         struct in6_addr *pfx;
2583
2584         pfx = NULL;
2585         if (rta[IFA_ADDRESS-1]) {
2586                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2587                         return -EINVAL;
2588                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2589         }
2590         if (rta[IFA_LOCAL-1]) {
2591                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2592                         return -EINVAL;
2593                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2594         }
2595         if (pfx == NULL)
2596                 return -EINVAL;
2597
2598         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2599 }
2600
2601 static int
2602 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2603 {
2604         struct rtattr  **rta = arg;
2605         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2606         struct in6_addr *pfx;
2607
2608         pfx = NULL;
2609         if (rta[IFA_ADDRESS-1]) {
2610                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2611                         return -EINVAL;
2612                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2613         }
2614         if (rta[IFA_LOCAL-1]) {
2615                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2616                         return -EINVAL;
2617                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2618         }
2619         if (pfx == NULL)
2620                 return -EINVAL;
2621
2622         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2623 }
2624
2625 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2626                              u32 pid, u32 seq, int event, unsigned int flags)
2627 {
2628         struct ifaddrmsg *ifm;
2629         struct nlmsghdr  *nlh;
2630         struct ifa_cacheinfo ci;
2631         unsigned char    *b = skb->tail;
2632
2633         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2634         ifm = NLMSG_DATA(nlh);
2635         ifm->ifa_family = AF_INET6;
2636         ifm->ifa_prefixlen = ifa->prefix_len;
2637         ifm->ifa_flags = ifa->flags;
2638         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2639         if (ifa->scope&IFA_HOST)
2640                 ifm->ifa_scope = RT_SCOPE_HOST;
2641         else if (ifa->scope&IFA_LINK)
2642                 ifm->ifa_scope = RT_SCOPE_LINK;
2643         else if (ifa->scope&IFA_SITE)
2644                 ifm->ifa_scope = RT_SCOPE_SITE;
2645         ifm->ifa_index = ifa->idev->dev->ifindex;
2646         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2647         if (!(ifa->flags&IFA_F_PERMANENT)) {
2648                 ci.ifa_prefered = ifa->prefered_lft;
2649                 ci.ifa_valid = ifa->valid_lft;
2650                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2651                         long tval = (jiffies - ifa->tstamp)/HZ;
2652                         ci.ifa_prefered -= tval;
2653                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2654                                 ci.ifa_valid -= tval;
2655                 }
2656         } else {
2657                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2658                 ci.ifa_valid = INFINITY_LIFE_TIME;
2659         }
2660         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2661                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2662         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2663                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2664         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2665         nlh->nlmsg_len = skb->tail - b;
2666         return skb->len;
2667
2668 nlmsg_failure:
2669 rtattr_failure:
2670         skb_trim(skb, b - skb->data);
2671         return -1;
2672 }
2673
2674 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2675                                 u32 pid, u32 seq, int event, u16 flags)
2676 {
2677         struct ifaddrmsg *ifm;
2678         struct nlmsghdr  *nlh;
2679         struct ifa_cacheinfo ci;
2680         unsigned char    *b = skb->tail;
2681
2682         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2683         ifm = NLMSG_DATA(nlh);
2684         ifm->ifa_family = AF_INET6;
2685         ifm->ifa_prefixlen = 128;
2686         ifm->ifa_flags = IFA_F_PERMANENT;
2687         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2688         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2689                 ifm->ifa_scope = RT_SCOPE_SITE;
2690         ifm->ifa_index = ifmca->idev->dev->ifindex;
2691         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2692         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2693                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2694                     * 100 / HZ);
2695         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2696                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2697                     * 100 / HZ);
2698         ci.ifa_prefered = INFINITY_LIFE_TIME;
2699         ci.ifa_valid = INFINITY_LIFE_TIME;
2700         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2701         nlh->nlmsg_len = skb->tail - b;
2702         return skb->len;
2703
2704 nlmsg_failure:
2705 rtattr_failure:
2706         skb_trim(skb, b - skb->data);
2707         return -1;
2708 }
2709
2710 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2711                                 u32 pid, u32 seq, int event, unsigned int flags)
2712 {
2713         struct ifaddrmsg *ifm;
2714         struct nlmsghdr  *nlh;
2715         struct ifa_cacheinfo ci;
2716         unsigned char    *b = skb->tail;
2717
2718         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2719         ifm = NLMSG_DATA(nlh);
2720         ifm->ifa_family = AF_INET6;
2721         ifm->ifa_prefixlen = 128;
2722         ifm->ifa_flags = IFA_F_PERMANENT;
2723         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2724         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2725                 ifm->ifa_scope = RT_SCOPE_SITE;
2726         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2727         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2728         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2729                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2730                     * 100 / HZ);
2731         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2732                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2733                     * 100 / HZ);
2734         ci.ifa_prefered = INFINITY_LIFE_TIME;
2735         ci.ifa_valid = INFINITY_LIFE_TIME;
2736         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2737         nlh->nlmsg_len = skb->tail - b;
2738         return skb->len;
2739
2740 nlmsg_failure:
2741 rtattr_failure:
2742         skb_trim(skb, b - skb->data);
2743         return -1;
2744 }
2745
2746 enum addr_type_t
2747 {
2748         UNICAST_ADDR,
2749         MULTICAST_ADDR,
2750         ANYCAST_ADDR,
2751 };
2752
2753 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2754                            enum addr_type_t type)
2755 {
2756         int idx, ip_idx;
2757         int s_idx, s_ip_idx;
2758         int err = 1;
2759         struct net_device *dev;
2760         struct inet6_dev *idev = NULL;
2761         struct inet6_ifaddr *ifa;
2762         struct ifmcaddr6 *ifmca;
2763         struct ifacaddr6 *ifaca;
2764
2765         s_idx = cb->args[0];
2766         s_ip_idx = ip_idx = cb->args[1];
2767         read_lock(&dev_base_lock);
2768
2769         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2770                 if (idx < s_idx)
2771                         continue;
2772                 if (idx > s_idx)
2773                         s_ip_idx = 0;
2774                 ip_idx = 0;
2775                 if ((idev = in6_dev_get(dev)) == NULL)
2776                         continue;
2777                 read_lock_bh(&idev->lock);
2778                 switch (type) {
2779                 case UNICAST_ADDR:
2780                         /* unicast address incl. temp addr */
2781                         for (ifa = idev->addr_list; ifa;
2782                              ifa = ifa->if_next, ip_idx++) {
2783                                 if (ip_idx < s_ip_idx)
2784                                         continue;
2785                                 if ((err = inet6_fill_ifaddr(skb, ifa,
2786                                     NETLINK_CB(cb->skb).pid,
2787                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
2788                                     NLM_F_MULTI)) <= 0)
2789                                         goto done;
2790                         }
2791                         break;
2792                 case MULTICAST_ADDR:
2793                         /* multicast address */
2794                         for (ifmca = idev->mc_list; ifmca;
2795                              ifmca = ifmca->next, ip_idx++) {
2796                                 if (ip_idx < s_ip_idx)
2797                                         continue;
2798                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2799                                     NETLINK_CB(cb->skb).pid,
2800                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2801                                     NLM_F_MULTI)) <= 0)
2802                                         goto done;
2803                         }
2804                         break;
2805                 case ANYCAST_ADDR:
2806                         /* anycast address */
2807                         for (ifaca = idev->ac_list; ifaca;
2808                              ifaca = ifaca->aca_next, ip_idx++) {
2809                                 if (ip_idx < s_ip_idx)
2810                                         continue;
2811                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2812                                     NETLINK_CB(cb->skb).pid,
2813                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2814                                     NLM_F_MULTI)) <= 0)
2815                                         goto done;
2816                         }
2817                         break;
2818                 default:
2819                         break;
2820                 }
2821                 read_unlock_bh(&idev->lock);
2822                 in6_dev_put(idev);
2823         }
2824 done:
2825         if (err <= 0) {
2826                 read_unlock_bh(&idev->lock);
2827                 in6_dev_put(idev);
2828         }
2829         read_unlock(&dev_base_lock);
2830         cb->args[0] = idx;
2831         cb->args[1] = ip_idx;
2832         return skb->len;
2833 }
2834
2835 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2836 {
2837         enum addr_type_t type = UNICAST_ADDR;
2838         return inet6_dump_addr(skb, cb, type);
2839 }
2840
2841 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2842 {
2843         enum addr_type_t type = MULTICAST_ADDR;
2844         return inet6_dump_addr(skb, cb, type);
2845 }
2846
2847
2848 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2849 {
2850         enum addr_type_t type = ANYCAST_ADDR;
2851         return inet6_dump_addr(skb, cb, type);
2852 }
2853
2854 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2855 {
2856         struct sk_buff *skb;
2857         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2858
2859         skb = alloc_skb(size, GFP_ATOMIC);
2860         if (!skb) {
2861                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, ENOBUFS);
2862                 return;
2863         }
2864         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
2865                 kfree_skb(skb);
2866                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, EINVAL);
2867                 return;
2868         }
2869         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFADDR;
2870         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFADDR, GFP_ATOMIC);
2871 }
2872
2873 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
2874                                 __s32 *array, int bytes)
2875 {
2876         memset(array, 0, bytes);
2877         array[DEVCONF_FORWARDING] = cnf->forwarding;
2878         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
2879         array[DEVCONF_MTU6] = cnf->mtu6;
2880         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
2881         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
2882         array[DEVCONF_AUTOCONF] = cnf->autoconf;
2883         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
2884         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
2885         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
2886         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
2887         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
2888 #ifdef CONFIG_IPV6_PRIVACY
2889         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
2890         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
2891         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
2892         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
2893         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
2894 #endif
2895         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
2896 }
2897
2898 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
2899                              u32 pid, u32 seq, int event, unsigned int flags)
2900 {
2901         struct net_device       *dev = idev->dev;
2902         __s32                   *array = NULL;
2903         struct ifinfomsg        *r;
2904         struct nlmsghdr         *nlh;
2905         unsigned char           *b = skb->tail;
2906         struct rtattr           *subattr;
2907         __u32                   mtu = dev->mtu;
2908         struct ifla_cacheinfo   ci;
2909
2910         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
2911         r = NLMSG_DATA(nlh);
2912         r->ifi_family = AF_INET6;
2913         r->__ifi_pad = 0;
2914         r->ifi_type = dev->type;
2915         r->ifi_index = dev->ifindex;
2916         r->ifi_flags = dev_get_flags(dev);
2917         r->ifi_change = 0;
2918
2919         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
2920
2921         if (dev->addr_len)
2922                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
2923
2924         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
2925         if (dev->ifindex != dev->iflink)
2926                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
2927
2928         subattr = (struct rtattr*)skb->tail;
2929
2930         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
2931
2932         /* return the device flags */
2933         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
2934
2935         /* return interface cacheinfo */
2936         ci.max_reasm_len = IPV6_MAXPLEN;
2937         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
2938                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2939         ci.reachable_time = idev->nd_parms->reachable_time;
2940         ci.retrans_time = idev->nd_parms->retrans_time;
2941         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
2942
2943         /* return the device sysctl params */
2944         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
2945                 goto rtattr_failure;
2946         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
2947         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
2948
2949         /* XXX - Statistics/MC not implemented */
2950         subattr->rta_len = skb->tail - (u8*)subattr;
2951
2952         nlh->nlmsg_len = skb->tail - b;
2953         kfree(array);
2954         return skb->len;
2955
2956 nlmsg_failure:
2957 rtattr_failure:
2958         if (array)
2959                 kfree(array);
2960         skb_trim(skb, b - skb->data);
2961         return -1;
2962 }
2963
2964 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2965 {
2966         int idx, err;
2967         int s_idx = cb->args[0];
2968         struct net_device *dev;
2969         struct inet6_dev *idev;
2970
2971         read_lock(&dev_base_lock);
2972         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
2973                 if (idx < s_idx)
2974                         continue;
2975                 if ((idev = in6_dev_get(dev)) == NULL)
2976                         continue;
2977                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
2978                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
2979                 in6_dev_put(idev);
2980                 if (err <= 0)
2981                         break;
2982         }
2983         read_unlock(&dev_base_lock);
2984         cb->args[0] = idx;
2985
2986         return skb->len;
2987 }
2988
2989 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
2990 {
2991         struct sk_buff *skb;
2992         /* 128 bytes ?? */
2993         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
2994
2995         skb = alloc_skb(size, GFP_ATOMIC);
2996         if (!skb) {
2997                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, ENOBUFS);
2998                 return;
2999         }
3000         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3001                 kfree_skb(skb);
3002                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, EINVAL);
3003                 return;
3004         }
3005         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFINFO;
3006         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFINFO, GFP_ATOMIC);
3007 }
3008
3009 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3010                         struct prefix_info *pinfo, u32 pid, u32 seq,
3011                         int event, unsigned int flags)
3012 {
3013         struct prefixmsg        *pmsg;
3014         struct nlmsghdr         *nlh;
3015         unsigned char           *b = skb->tail;
3016         struct prefix_cacheinfo ci;
3017
3018         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3019         pmsg = NLMSG_DATA(nlh);
3020         pmsg->prefix_family = AF_INET6;
3021         pmsg->prefix_pad1 = 0;
3022         pmsg->prefix_pad2 = 0;
3023         pmsg->prefix_ifindex = idev->dev->ifindex;
3024         pmsg->prefix_len = pinfo->prefix_len;
3025         pmsg->prefix_type = pinfo->type;
3026         pmsg->prefix_pad3 = 0;
3027
3028         pmsg->prefix_flags = 0;
3029         if (pinfo->onlink)
3030                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3031         if (pinfo->autoconf)
3032                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3033
3034         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3035
3036         ci.preferred_time = ntohl(pinfo->prefered);
3037         ci.valid_time = ntohl(pinfo->valid);
3038         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3039
3040         nlh->nlmsg_len = skb->tail - b;
3041         return skb->len;
3042
3043 nlmsg_failure:
3044 rtattr_failure:
3045         skb_trim(skb, b - skb->data);
3046         return -1;
3047 }
3048
3049 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3050                          struct prefix_info *pinfo)
3051 {
3052         struct sk_buff *skb;
3053         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3054
3055         skb = alloc_skb(size, GFP_ATOMIC);
3056         if (!skb) {
3057                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, ENOBUFS);
3058                 return;
3059         }
3060         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3061                 kfree_skb(skb);
3062                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, EINVAL);
3063                 return;
3064         }
3065         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_PREFIX;
3066         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_PREFIX, GFP_ATOMIC);
3067 }
3068
3069 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3070         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3071         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3072         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3073         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3074         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3075         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3076         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3077         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3078         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3079                                       .dumpit   = inet6_dump_fib, },
3080 };
3081
3082 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3083 {
3084         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3085
3086         switch (event) {
3087         case RTM_NEWADDR:
3088                 dst_hold(&ifp->rt->u.dst);
3089                 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3090                         dst_release(&ifp->rt->u.dst);
3091                 if (ifp->idev->cnf.forwarding)
3092                         addrconf_join_anycast(ifp);
3093                 break;
3094         case RTM_DELADDR:
3095                 if (ifp->idev->cnf.forwarding)
3096                         addrconf_leave_anycast(ifp);
3097                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3098                 dst_hold(&ifp->rt->u.dst);
3099                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3100                         dst_free(&ifp->rt->u.dst);
3101                 else
3102                         dst_release(&ifp->rt->u.dst);
3103                 break;
3104         }
3105 }
3106
3107 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3108 {
3109         read_lock_bh(&addrconf_lock);
3110         if (likely(ifp->idev->dead == 0))
3111                 __ipv6_ifa_notify(event, ifp);
3112         read_unlock_bh(&addrconf_lock);
3113 }
3114
3115 #ifdef CONFIG_SYSCTL
3116
3117 static
3118 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3119                            void __user *buffer, size_t *lenp, loff_t *ppos)
3120 {
3121         int *valp = ctl->data;
3122         int val = *valp;
3123         int ret;
3124
3125         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3126
3127         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3128                 if (valp != &ipv6_devconf.forwarding) {
3129                         if ((!*valp) ^ (!val)) {
3130                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3131                                 if (idev == NULL)
3132                                         return ret;
3133                                 dev_forward_change(idev);
3134                         }
3135                 } else {
3136                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3137                         addrconf_forward_change();
3138                 }
3139                 if (*valp)
3140                         rt6_purge_dflt_routers();
3141         }
3142
3143         return ret;
3144 }
3145
3146 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3147                                             int __user *name, int nlen,
3148                                             void __user *oldval,
3149                                             size_t __user *oldlenp,
3150                                             void __user *newval, size_t newlen,
3151                                             void **context)
3152 {
3153         int *valp = table->data;
3154         int new;
3155
3156         if (!newval || !newlen)
3157                 return 0;
3158         if (newlen != sizeof(int))
3159                 return -EINVAL;
3160         if (get_user(new, (int __user *)newval))
3161                 return -EFAULT;
3162         if (new == *valp)
3163                 return 0;
3164         if (oldval && oldlenp) {
3165                 size_t len;
3166                 if (get_user(len, oldlenp))
3167                         return -EFAULT;
3168                 if (len) {
3169                         if (len > table->maxlen)
3170                                 len = table->maxlen;
3171                         if (copy_to_user(oldval, valp, len))
3172                                 return -EFAULT;
3173                         if (put_user(len, oldlenp))
3174                                 return -EFAULT;
3175                 }
3176         }
3177
3178         if (valp != &ipv6_devconf_dflt.forwarding) {
3179                 if (valp != &ipv6_devconf.forwarding) {
3180                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3181                         int changed;
3182                         if (unlikely(idev == NULL))
3183                                 return -ENODEV;
3184                         changed = (!*valp) ^ (!new);
3185                         *valp = new;
3186                         if (changed)
3187                                 dev_forward_change(idev);
3188                 } else {
3189                         *valp = new;
3190                         addrconf_forward_change();
3191                 }
3192
3193                 if (*valp)
3194                         rt6_purge_dflt_routers();
3195         } else
3196                 *valp = new;
3197
3198         return 1;
3199 }
3200
3201 static struct addrconf_sysctl_table
3202 {
3203         struct ctl_table_header *sysctl_header;
3204         ctl_table addrconf_vars[__NET_IPV6_MAX];
3205         ctl_table addrconf_dev[2];
3206         ctl_table addrconf_conf_dir[2];
3207         ctl_table addrconf_proto_dir[2];
3208         ctl_table addrconf_root_dir[2];
3209 } addrconf_sysctl = {
3210         .sysctl_header = NULL,
3211         .addrconf_vars = {
3212                 {
3213                         .ctl_name       =       NET_IPV6_FORWARDING,
3214                         .procname       =       "forwarding",
3215                         .data           =       &ipv6_devconf.forwarding,
3216                         .maxlen         =       sizeof(int),
3217                         .mode           =       0644,
3218                         .proc_handler   =       &addrconf_sysctl_forward,
3219                         .strategy       =       &addrconf_sysctl_forward_strategy,
3220                 },
3221                 {
3222                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3223                         .procname       =       "hop_limit",
3224                         .data           =       &ipv6_devconf.hop_limit,
3225                         .maxlen         =       sizeof(int),
3226                         .mode           =       0644,
3227                         .proc_handler   =       proc_dointvec,
3228                 },
3229                 {
3230                         .ctl_name       =       NET_IPV6_MTU,
3231                         .procname       =       "mtu",
3232                         .data           =       &ipv6_devconf.mtu6,
3233                         .maxlen         =       sizeof(int),
3234                         .mode           =       0644,
3235                         .proc_handler   =       &proc_dointvec,
3236                 },
3237                 {
3238                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3239                         .procname       =       "accept_ra",
3240                         .data           =       &ipv6_devconf.accept_ra,
3241                         .maxlen         =       sizeof(int),
3242                         .mode           =       0644,
3243                         .proc_handler   =       &proc_dointvec,
3244                 },
3245                 {
3246                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3247                         .procname       =       "accept_redirects",
3248                         .data           =       &ipv6_devconf.accept_redirects,
3249                         .maxlen         =       sizeof(int),
3250                         .mode           =       0644,
3251                         .proc_handler   =       &proc_dointvec,
3252                 },
3253                 {
3254                         .ctl_name       =       NET_IPV6_AUTOCONF,
3255                         .procname       =       "autoconf",
3256                         .data           =       &ipv6_devconf.autoconf,
3257                         .maxlen         =       sizeof(int),
3258                         .mode           =       0644,
3259                         .proc_handler   =       &proc_dointvec,
3260                 },
3261                 {
3262                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3263                         .procname       =       "dad_transmits",
3264                         .data           =       &ipv6_devconf.dad_transmits,
3265                         .maxlen         =       sizeof(int),
3266                         .mode           =       0644,
3267                         .proc_handler   =       &proc_dointvec,
3268                 },
3269                 {
3270                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3271                         .procname       =       "router_solicitations",
3272                         .data           =       &ipv6_devconf.rtr_solicits,
3273                         .maxlen         =       sizeof(int),
3274                         .mode           =       0644,
3275                         .proc_handler   =       &proc_dointvec,
3276                 },
3277                 {
3278                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3279                         .procname       =       "router_solicitation_interval",
3280                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3281                         .maxlen         =       sizeof(int),
3282                         .mode           =       0644,
3283                         .proc_handler   =       &proc_dointvec_jiffies,
3284                         .strategy       =       &sysctl_jiffies,
3285                 },
3286                 {
3287                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3288                         .procname       =       "router_solicitation_delay",
3289                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3290                         .maxlen         =       sizeof(int),
3291                         .mode           =       0644,
3292                         .proc_handler   =       &proc_dointvec_jiffies,
3293                         .strategy       =       &sysctl_jiffies,
3294                 },
3295                 {
3296                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3297                         .procname       =       "force_mld_version",
3298                         .data           =       &ipv6_devconf.force_mld_version,
3299                         .maxlen         =       sizeof(int),
3300                         .mode           =       0644,
3301                         .proc_handler   =       &proc_dointvec,
3302                 },
3303 #ifdef CONFIG_IPV6_PRIVACY
3304                 {
3305                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3306                         .procname       =       "use_tempaddr",
3307                         .data           =       &ipv6_devconf.use_tempaddr,
3308                         .maxlen         =       sizeof(int),
3309                         .mode           =       0644,
3310                         .proc_handler   =       &proc_dointvec,
3311                 },
3312                 {
3313                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3314                         .procname       =       "temp_valid_lft",
3315                         .data           =       &ipv6_devconf.temp_valid_lft,
3316                         .maxlen         =       sizeof(int),
3317                         .mode           =       0644,
3318                         .proc_handler   =       &proc_dointvec,
3319                 },
3320                 {
3321                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3322                         .procname       =       "temp_prefered_lft",
3323                         .data           =       &ipv6_devconf.temp_prefered_lft,
3324                         .maxlen         =       sizeof(int),
3325                         .mode           =       0644,
3326                         .proc_handler   =       &proc_dointvec,
3327                 },
3328                 {
3329                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3330                         .procname       =       "regen_max_retry",
3331                         .data           =       &ipv6_devconf.regen_max_retry,
3332                         .maxlen         =       sizeof(int),
3333                         .mode           =       0644,
3334                         .proc_handler   =       &proc_dointvec,
3335                 },
3336                 {
3337                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3338                         .procname       =       "max_desync_factor",
3339                         .data           =       &ipv6_devconf.max_desync_factor,
3340                         .maxlen         =       sizeof(int),
3341                         .mode           =       0644,
3342                         .proc_handler   =       &proc_dointvec,
3343                 },
3344 #endif
3345                 {
3346                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3347                         .procname       =       "max_addresses",
3348                         .data           =       &ipv6_devconf.max_addresses,
3349                         .maxlen         =       sizeof(int),
3350                         .mode           =       0644,
3351                         .proc_handler   =       &proc_dointvec,
3352                 },
3353                 {
3354                         .ctl_name       =       0,      /* sentinel */
3355                 }
3356         },
3357         .addrconf_dev = {
3358                 {
3359                         .ctl_name       =       NET_PROTO_CONF_ALL,
3360                         .procname       =       "all",
3361                         .mode           =       0555,
3362                         .child          =       addrconf_sysctl.addrconf_vars,
3363                 },
3364                 {
3365                         .ctl_name       =       0,      /* sentinel */
3366                 }
3367         },
3368         .addrconf_conf_dir = {
3369                 {
3370                         .ctl_name       =       NET_IPV6_CONF,
3371                         .procname       =       "conf",
3372                         .mode           =       0555,
3373                         .child          =       addrconf_sysctl.addrconf_dev,
3374                 },
3375                 {
3376                         .ctl_name       =       0,      /* sentinel */
3377                 }
3378         },
3379         .addrconf_proto_dir = {
3380                 {
3381                         .ctl_name       =       NET_IPV6,
3382                         .procname       =       "ipv6",
3383                         .mode           =       0555,
3384                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3385                 },
3386                 {
3387                         .ctl_name       =       0,      /* sentinel */
3388                 }
3389         },
3390         .addrconf_root_dir = {
3391                 {
3392                         .ctl_name       =       CTL_NET,
3393                         .procname       =       "net",
3394                         .mode           =       0555,
3395                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3396                 },
3397                 {
3398                         .ctl_name       =       0,      /* sentinel */
3399                 }
3400         },
3401 };
3402
3403 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3404 {
3405         int i;
3406         struct net_device *dev = idev ? idev->dev : NULL;
3407         struct addrconf_sysctl_table *t;
3408         char *dev_name = NULL;
3409
3410         t = kmalloc(sizeof(*t), GFP_KERNEL);
3411         if (t == NULL)
3412                 return;
3413         memcpy(t, &addrconf_sysctl, sizeof(*t));
3414         for (i=0; t->addrconf_vars[i].data; i++) {
3415                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3416                 t->addrconf_vars[i].de = NULL;
3417                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3418         }
3419         if (dev) {
3420                 dev_name = dev->name;
3421                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3422         } else {
3423                 dev_name = "default";
3424                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3425         }
3426
3427         /*
3428          * Make a copy of dev_name, because '.procname' is regarded as const
3429          * by sysctl and we wouldn't want anyone to change it under our feet
3430          * (see SIOCSIFNAME).
3431          */
3432         dev_name = kstrdup(dev_name, GFP_KERNEL);
3433         if (!dev_name)
3434             goto free;
3435
3436         t->addrconf_dev[0].procname = dev_name;
3437
3438         t->addrconf_dev[0].child = t->addrconf_vars;
3439         t->addrconf_dev[0].de = NULL;
3440         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3441         t->addrconf_conf_dir[0].de = NULL;
3442         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3443         t->addrconf_proto_dir[0].de = NULL;
3444         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3445         t->addrconf_root_dir[0].de = NULL;
3446
3447         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3448         if (t->sysctl_header == NULL)
3449                 goto free_procname;
3450         else
3451                 p->sysctl = t;
3452         return;
3453
3454         /* error path */
3455  free_procname:
3456         kfree(dev_name);
3457  free:
3458         kfree(t);
3459
3460         return;
3461 }
3462
3463 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3464 {
3465         if (p->sysctl) {
3466                 struct addrconf_sysctl_table *t = p->sysctl;
3467                 p->sysctl = NULL;
3468                 unregister_sysctl_table(t->sysctl_header);
3469                 kfree(t->addrconf_dev[0].procname);
3470                 kfree(t);
3471         }
3472 }
3473
3474
3475 #endif
3476
3477 /*
3478  *      Device notifier
3479  */
3480
3481 int register_inet6addr_notifier(struct notifier_block *nb)
3482 {
3483         return notifier_chain_register(&inet6addr_chain, nb);
3484 }
3485
3486 int unregister_inet6addr_notifier(struct notifier_block *nb)
3487 {
3488         return notifier_chain_unregister(&inet6addr_chain,nb);
3489 }
3490
3491 /*
3492  *      Init / cleanup code
3493  */
3494
3495 int __init addrconf_init(void)
3496 {
3497         int err = 0;
3498
3499         /* The addrconf netdev notifier requires that loopback_dev
3500          * has it's ipv6 private information allocated and setup
3501          * before it can bring up and give link-local addresses
3502          * to other devices which are up.
3503          *
3504          * Unfortunately, loopback_dev is not necessarily the first
3505          * entry in the global dev_base list of net devices.  In fact,
3506          * it is likely to be the very last entry on that list.
3507          * So this causes the notifier registry below to try and
3508          * give link-local addresses to all devices besides loopback_dev
3509          * first, then loopback_dev, which cases all the non-loopback_dev
3510          * devices to fail to get a link-local address.
3511          *
3512          * So, as a temporary fix, allocate the ipv6 structure for
3513          * loopback_dev first by hand.
3514          * Longer term, all of the dependencies ipv6 has upon the loopback
3515          * device and it being up should be removed.
3516          */
3517         rtnl_lock();
3518         if (!ipv6_add_dev(&loopback_dev))
3519                 err = -ENOMEM;
3520         rtnl_unlock();
3521         if (err)
3522                 return err;
3523
3524         register_netdevice_notifier(&ipv6_dev_notf);
3525
3526 #ifdef CONFIG_IPV6_PRIVACY
3527         md5_tfm = crypto_alloc_tfm("md5", 0);
3528         if (unlikely(md5_tfm == NULL))
3529                 printk(KERN_WARNING
3530                         "failed to load transform for md5\n");
3531 #endif
3532
3533         addrconf_verify(0);
3534         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3535 #ifdef CONFIG_SYSCTL
3536         addrconf_sysctl.sysctl_header =
3537                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3538         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3539 #endif
3540
3541         return 0;
3542 }
3543
3544 void __exit addrconf_cleanup(void)
3545 {
3546         struct net_device *dev;
3547         struct inet6_dev *idev;
3548         struct inet6_ifaddr *ifa;
3549         int i;
3550
3551         unregister_netdevice_notifier(&ipv6_dev_notf);
3552
3553         rtnetlink_links[PF_INET6] = NULL;
3554 #ifdef CONFIG_SYSCTL
3555         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3556         addrconf_sysctl_unregister(&ipv6_devconf);
3557 #endif
3558
3559         rtnl_lock();
3560
3561         /*
3562          *      clean dev list.
3563          */
3564
3565         for (dev=dev_base; dev; dev=dev->next) {
3566                 if ((idev = __in6_dev_get(dev)) == NULL)
3567                         continue;
3568                 addrconf_ifdown(dev, 1);
3569         }
3570         addrconf_ifdown(&loopback_dev, 2);
3571
3572         /*
3573          *      Check hash table.
3574          */
3575
3576         write_lock_bh(&addrconf_hash_lock);
3577         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3578                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3579                         struct inet6_ifaddr *bifa;
3580
3581                         bifa = ifa;
3582                         ifa = ifa->lst_next;
3583                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3584                         /* Do not free it; something is wrong.
3585                            Now we can investigate it with debugger.
3586                          */
3587                 }
3588         }
3589         write_unlock_bh(&addrconf_hash_lock);
3590
3591         del_timer(&addr_chk_timer);
3592
3593         rtnl_unlock();
3594
3595 #ifdef CONFIG_IPV6_PRIVACY
3596         if (likely(md5_tfm != NULL)) {
3597                 crypto_free_tfm(md5_tfm);
3598                 md5_tfm = NULL;
3599         }
3600 #endif
3601
3602 #ifdef CONFIG_PROC_FS
3603         proc_net_remove("if_inet6");
3604 #endif
3605 }