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
  61 #include <net/sock.h>
  62 #include <net/snmp.h>
  63
  64 #include <net/ipv6.h>
  65 #include <net/protocol.h>
  66 #include <net/ndisc.h>
  67 #include <net/ip6_route.h>
  68 #include <net/addrconf.h>
  69 #include <net/tcp.h>
  70 #include <net/ip.h>
  71 #include <linux/if_tunnel.h>
  72 #include <linux/rtnetlink.h>
  73
  74 #ifdef CONFIG_IPV6_PRIVACY
  75 #include <linux/random.h>
  76 #include <linux/crypto.h>
  77 #include <asm/scatterlist.h>
  78 #endif
  79
  80 #include <asm/uaccess.h>
  81
  82 #include <linux/proc_fs.h>
  83 #include <linux/seq_file.h>
  84
  85 /* Set to 3 to get tracing... */
  86 #define ACONF_DEBUG 2
  87
  88 #if ACONF_DEBUG >= 3
  89 #define ADBG(x) printk x
  90 #else
  91 #define ADBG(x)
  92 #endif
  93
  94 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  95 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  96
  97 #ifdef CONFIG_SYSCTL
  98 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
  99 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 100 #endif
 101
 102 #ifdef CONFIG_IPV6_PRIVACY
 103 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 104 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 105 static void ipv6_regen_rndid(unsigned long data);
 106
 107 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 108 static struct crypto_tfm *md5_tfm;
 109 static DEFINE_SPINLOCK(md5_tfm_lock);
 110 #endif
 111
 112 static int ipv6_count_addresses(struct inet6_dev *idev);
 113
 114 /*
 115  *      Configured unicast address hash table
 116  */
 117 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 118 static DEFINE_RWLOCK(addrconf_hash_lock);
 119
 120 /* Protects inet6 devices */
 121 DEFINE_RWLOCK(addrconf_lock);
 122
 123 static void addrconf_verify(unsigned long);
 124
 125 static struct timer_list addr_chk_timer =
 126                         TIMER_INITIALIZER(addrconf_verify, 0, 0);
 127 static DEFINE_SPINLOCK(addrconf_verify_lock);
 128
 129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 131
 132 static int addrconf_ifdown(struct net_device *dev, int how);
 133
 134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, int flags);
 135 static void addrconf_dad_timer(unsigned long data);
 136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 137 static void addrconf_rs_timer(unsigned long data);
 138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140
 141 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 142                                 struct prefix_info *pinfo);
 143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 144
 145 static struct notifier_block *inet6addr_chain;
 146
 147 struct ipv6_devconf ipv6_devconf = {
 148         .forwarding             = 0,
 149         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 150         .mtu6                   = IPV6_MIN_MTU,
 151         .accept_ra              = 1,
 152         .accept_redirects       = 1,
 153         .autoconf               = 1,
 154         .force_mld_version      = 0,
 155         .dad_transmits          = 1,
 156         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 157         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 158         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 159 #ifdef CONFIG_IPV6_PRIVACY
 160         .use_tempaddr           = 0,
 161         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 162         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 163         .regen_max_retry        = REGEN_MAX_RETRY,
 164         .max_desync_factor      = MAX_DESYNC_FACTOR,
 165 #endif
 166         .max_addresses          = IPV6_MAX_ADDRESSES,
 167 };
 168
 169 static struct ipv6_devconf ipv6_devconf_dflt = {
 170         .forwarding             = 0,
 171         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 172         .mtu6                   = IPV6_MIN_MTU,
 173         .accept_ra              = 1,
 174         .accept_redirects       = 1,
 175         .autoconf               = 1,
 176         .dad_transmits          = 1,
 177         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 178         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 179         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 180 #ifdef CONFIG_IPV6_PRIVACY
 181         .use_tempaddr           = 0,
 182         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 183         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 184         .regen_max_retry        = REGEN_MAX_RETRY,
 185         .max_desync_factor      = MAX_DESYNC_FACTOR,
 186 #endif
 187         .max_addresses          = IPV6_MAX_ADDRESSES,
 188 };
 189
 190 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 191 #if 0
 192 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 193 #endif
 194 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 195
 196 int ipv6_addr_type(const struct in6_addr *addr)
 197 {
 198         int type;
 199         u32 st;
 200
 201         st = addr->s6_addr32[0];
 202
 203         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 204                 type = IPV6_ADDR_MULTICAST;
 205
 206                 switch((st & htonl(0x00FF0000))) {
 207                         case __constant_htonl(0x00010000):
 208                                 type |= IPV6_ADDR_LOOPBACK;
 209                                 break;
 210
 211                         case __constant_htonl(0x00020000):
 212                                 type |= IPV6_ADDR_LINKLOCAL;
 213                                 break;
 214
 215                         case __constant_htonl(0x00050000):
 216                                 type |= IPV6_ADDR_SITELOCAL;
 217                                 break;
 218                 };
 219                 return type;
 220         }
 221
 222         type = IPV6_ADDR_UNICAST;
 223
 224         /* Consider all addresses with the first three bits different of
 225            000 and 111 as finished.
 226          */
 227         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 228             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 229                 return type;
 230
 231         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 232                 return (IPV6_ADDR_LINKLOCAL | type);
 233
 234         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 235                 return (IPV6_ADDR_SITELOCAL | type);
 236
 237         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 238                 if (addr->s6_addr32[2] == 0) {
 239                         if (addr->s6_addr32[3] == 0)
 240                                 return IPV6_ADDR_ANY;
 241
 242                         if (addr->s6_addr32[3] == htonl(0x00000001))
 243                                 return (IPV6_ADDR_LOOPBACK | type);
 244
 245                         return (IPV6_ADDR_COMPATv4 | type);
 246                 }
 247
 248                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 249                         return IPV6_ADDR_MAPPED;
 250         }
 251
 252         st &= htonl(0xFF000000);
 253         if (st == 0)
 254                 return IPV6_ADDR_RESERVED;
 255         st &= htonl(0xFE000000);
 256         if (st == htonl(0x02000000))
 257                 return IPV6_ADDR_RESERVED;      /* for NSAP */
 258         if (st == htonl(0x04000000))
 259                 return IPV6_ADDR_RESERVED;      /* for IPX */
 260         return type;
 261 }
 262
 263 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 264 {
 265         if (del_timer(&ifp->timer))
 266                 __in6_ifa_put(ifp);
 267 }
 268
 269 enum addrconf_timer_t
 270 {
 271         AC_NONE,
 272         AC_DAD,
 273         AC_RS,
 274 };
 275
 276 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 277                                enum addrconf_timer_t what,
 278                                unsigned long when)
 279 {
 280         if (!del_timer(&ifp->timer))
 281                 in6_ifa_hold(ifp);
 282
 283         switch (what) {
 284         case AC_DAD:
 285                 ifp->timer.function = addrconf_dad_timer;
 286                 break;
 287         case AC_RS:
 288                 ifp->timer.function = addrconf_rs_timer;
 289                 break;
 290         default:;
 291         }
 292         ifp->timer.expires = jiffies + when;
 293         add_timer(&ifp->timer);
 294 }
 295
 296 /* Nobody refers to this device, we may destroy it. */
 297
 298 void in6_dev_finish_destroy(struct inet6_dev *idev)
 299 {
 300         struct net_device *dev = idev->dev;
 301         BUG_TRAP(idev->addr_list==NULL);
 302         BUG_TRAP(idev->mc_list==NULL);
 303 #ifdef NET_REFCNT_DEBUG
 304         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 305 #endif
 306         dev_put(dev);
 307         if (!idev->dead) {
 308                 printk("Freeing alive inet6 device %p\n", idev);
 309                 return;
 310         }
 311         snmp6_free_dev(idev);
 312         kfree(idev);
 313 }
 314
 315 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 316 {
 317         struct inet6_dev *ndev;
 318
 319         ASSERT_RTNL();
 320
 321         if (dev->mtu < IPV6_MIN_MTU)
 322                 return NULL;
 323
 324         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 325
 326         if (ndev) {
 327                 memset(ndev, 0, sizeof(struct inet6_dev));
 328
 329                 rwlock_init(&ndev->lock);
 330                 ndev->dev = dev;
 331                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 332                 ndev->cnf.mtu6 = dev->mtu;
 333                 ndev->cnf.sysctl = NULL;
 334                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 335                 if (ndev->nd_parms == NULL) {
 336                         kfree(ndev);
 337                         return NULL;
 338                 }
 339                 /* We refer to the device */
 340                 dev_hold(dev);
 341
 342                 if (snmp6_alloc_dev(ndev) < 0) {
 343                         ADBG((KERN_WARNING
 344                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
 345                                 __FUNCTION__, dev->name));
 346                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 347                         ndev->dead = 1;
 348                         in6_dev_finish_destroy(ndev);
 349                         return NULL;
 350                 }
 351
 352                 if (snmp6_register_dev(ndev) < 0) {
 353                         ADBG((KERN_WARNING
 354                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 355                                 __FUNCTION__, dev->name));
 356                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 357                         ndev->dead = 1;
 358                         in6_dev_finish_destroy(ndev);
 359                         return NULL;
 360                 }
 361
 362                 /* One reference from device.  We must do this before
 363                  * we invoke __ipv6_regen_rndid().
 364                  */
 365                 in6_dev_hold(ndev);
 366
 367 #ifdef CONFIG_IPV6_PRIVACY
 368                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
 369                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
 370                 init_timer(&ndev->regen_timer);
 371                 ndev->regen_timer.function = ipv6_regen_rndid;
 372                 ndev->regen_timer.data = (unsigned long) ndev;
 373                 if ((dev->flags&IFF_LOOPBACK) ||
 374                     dev->type == ARPHRD_TUNNEL ||
 375                     dev->type == ARPHRD_SIT) {
 376                         printk(KERN_INFO
 377                                 "Disabled Privacy Extensions on device %p(%s)\n",
 378                                 dev, dev->name);
 379                         ndev->cnf.use_tempaddr = -1;
 380                 } else {
 381                         in6_dev_hold(ndev);
 382                         ipv6_regen_rndid((unsigned long) ndev);
 383                 }
 384 #endif
 385
 386                 write_lock_bh(&addrconf_lock);
 387                 dev->ip6_ptr = ndev;
 388                 write_unlock_bh(&addrconf_lock);
 389
 390                 ipv6_mc_init_dev(ndev);
 391                 ndev->tstamp = jiffies;
 392 #ifdef CONFIG_SYSCTL
 393                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 394                                       NET_IPV6_NEIGH, "ipv6",
 395                                       &ndisc_ifinfo_sysctl_change,
 396                                       NULL);
 397                 addrconf_sysctl_register(ndev, &ndev->cnf);
 398 #endif
 399         }
 400         return ndev;
 401 }
 402
 403 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 404 {
 405         struct inet6_dev *idev;
 406
 407         ASSERT_RTNL();
 408
 409         if ((idev = __in6_dev_get(dev)) == NULL) {
 410                 if ((idev = ipv6_add_dev(dev)) == NULL)
 411                         return NULL;
 412         }
 413         if (dev->flags&IFF_UP)
 414                 ipv6_mc_up(idev);
 415         return idev;
 416 }
 417
 418 #ifdef CONFIG_SYSCTL
 419 static void dev_forward_change(struct inet6_dev *idev)
 420 {
 421         struct net_device *dev;
 422         struct inet6_ifaddr *ifa;
 423         struct in6_addr addr;
 424
 425         if (!idev)
 426                 return;
 427         dev = idev->dev;
 428         if (dev && (dev->flags & IFF_MULTICAST)) {
 429                 ipv6_addr_all_routers(&addr);
 430
 431                 if (idev->cnf.forwarding)
 432                         ipv6_dev_mc_inc(dev, &addr);
 433                 else
 434                         ipv6_dev_mc_dec(dev, &addr);
 435         }
 436         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 437                 if (idev->cnf.forwarding)
 438                         addrconf_join_anycast(ifa);
 439                 else
 440                         addrconf_leave_anycast(ifa);
 441         }
 442 }
 443
 444
 445 static void addrconf_forward_change(void)
 446 {
 447         struct net_device *dev;
 448         struct inet6_dev *idev;
 449
 450         read_lock(&dev_base_lock);
 451         for (dev=dev_base; dev; dev=dev->next) {
 452                 read_lock(&addrconf_lock);
 453                 idev = __in6_dev_get(dev);
 454                 if (idev) {
 455                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 456                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 457                         if (changed)
 458                                 dev_forward_change(idev);
 459                 }
 460                 read_unlock(&addrconf_lock);
 461         }
 462         read_unlock(&dev_base_lock);
 463 }
 464 #endif
 465
 466 /* Nobody refers to this ifaddr, destroy it */
 467
 468 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 469 {
 470         BUG_TRAP(ifp->if_next==NULL);
 471         BUG_TRAP(ifp->lst_next==NULL);
 472 #ifdef NET_REFCNT_DEBUG
 473         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 474 #endif
 475
 476         in6_dev_put(ifp->idev);
 477
 478         if (del_timer(&ifp->timer))
 479                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 480
 481         if (!ifp->dead) {
 482                 printk("Freeing alive inet6 address %p\n", ifp);
 483                 return;
 484         }
 485         dst_release(&ifp->rt->u.dst);
 486
 487         kfree(ifp);
 488 }
 489
 490 /* On success it returns ifp with increased reference count */
 491
 492 static struct inet6_ifaddr *
 493 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 494               int scope, unsigned flags)
 495 {
 496         struct inet6_ifaddr *ifa = NULL;
 497         struct rt6_info *rt;
 498         int hash;
 499         int err = 0;
 500
 501         read_lock_bh(&addrconf_lock);
 502         if (idev->dead) {
 503                 err = -ENODEV;                  /*XXX*/
 504                 goto out2;
 505         }
 506
 507         write_lock(&addrconf_hash_lock);
 508
 509         /* Ignore adding duplicate addresses on an interface */
 510         if (ipv6_chk_same_addr(addr, idev->dev)) {
 511                 ADBG(("ipv6_add_addr: already assigned\n"));
 512                 err = -EEXIST;
 513                 goto out;
 514         }
 515
 516         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 517
 518         if (ifa == NULL) {
 519                 ADBG(("ipv6_add_addr: malloc failed\n"));
 520                 err = -ENOBUFS;
 521                 goto out;
 522         }
 523
 524         rt = addrconf_dst_alloc(idev, addr, 0);
 525         if (IS_ERR(rt)) {
 526                 err = PTR_ERR(rt);
 527                 goto out;
 528         }
 529
 530         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 531         ipv6_addr_copy(&ifa->addr, addr);
 532
 533         spin_lock_init(&ifa->lock);
 534         init_timer(&ifa->timer);
 535         ifa->timer.data = (unsigned long) ifa;
 536         ifa->scope = scope;
 537         ifa->prefix_len = pfxlen;
 538         ifa->flags = flags | IFA_F_TENTATIVE;
 539         ifa->cstamp = ifa->tstamp = jiffies;
 540
 541         ifa->idev = idev;
 542         in6_dev_hold(idev);
 543         /* For caller */
 544         in6_ifa_hold(ifa);
 545
 546         /* Add to big hash table */
 547         hash = ipv6_addr_hash(addr);
 548
 549         ifa->lst_next = inet6_addr_lst[hash];
 550         inet6_addr_lst[hash] = ifa;
 551         in6_ifa_hold(ifa);
 552         write_unlock(&addrconf_hash_lock);
 553
 554         write_lock(&idev->lock);
 555         /* Add to inet6_dev unicast addr list. */
 556         ifa->if_next = idev->addr_list;
 557         idev->addr_list = ifa;
 558
 559 #ifdef CONFIG_IPV6_PRIVACY
 560         if (ifa->flags&IFA_F_TEMPORARY) {
 561                 ifa->tmp_next = idev->tempaddr_list;
 562                 idev->tempaddr_list = ifa;
 563                 in6_ifa_hold(ifa);
 564         }
 565 #endif
 566
 567         ifa->rt = rt;
 568
 569         in6_ifa_hold(ifa);
 570         write_unlock(&idev->lock);
 571 out2:
 572         read_unlock_bh(&addrconf_lock);
 573
 574         if (unlikely(err == 0))
 575                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 576         else {
 577                 kfree(ifa);
 578                 ifa = ERR_PTR(err);
 579         }
 580
 581         return ifa;
 582 out:
 583         write_unlock(&addrconf_hash_lock);
 584         goto out2;
 585 }
 586
 587 /* This function wants to get referenced ifp and releases it before return */
 588
 589 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 590 {
 591         struct inet6_ifaddr *ifa, **ifap;
 592         struct inet6_dev *idev = ifp->idev;
 593         int hash;
 594         int deleted = 0, onlink = 0;
 595         unsigned long expires = jiffies;
 596
 597         hash = ipv6_addr_hash(&ifp->addr);
 598
 599         ifp->dead = 1;
 600
 601         write_lock_bh(&addrconf_hash_lock);
 602         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 603              ifap = &ifa->lst_next) {
 604                 if (ifa == ifp) {
 605                         *ifap = ifa->lst_next;
 606                         __in6_ifa_put(ifp);
 607                         ifa->lst_next = NULL;
 608                         break;
 609                 }
 610         }
 611         write_unlock_bh(&addrconf_hash_lock);
 612
 613         write_lock_bh(&idev->lock);
 614 #ifdef CONFIG_IPV6_PRIVACY
 615         if (ifp->flags&IFA_F_TEMPORARY) {
 616                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 617                      ifap = &ifa->tmp_next) {
 618                         if (ifa == ifp) {
 619                                 *ifap = ifa->tmp_next;
 620                                 if (ifp->ifpub) {
 621                                         in6_ifa_put(ifp->ifpub);
 622                                         ifp->ifpub = NULL;
 623                                 }
 624                                 __in6_ifa_put(ifp);
 625                                 ifa->tmp_next = NULL;
 626                                 break;
 627                         }
 628                 }
 629         }
 630 #endif
 631
 632         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
 633              ifap = &ifa->if_next) {
 634                 if (ifa == ifp) {
 635                         *ifap = ifa->if_next;
 636                         __in6_ifa_put(ifp);
 637                         ifa->if_next = NULL;
 638                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 639                                 break;
 640                         deleted = 1;
 641                 } else if (ifp->flags & IFA_F_PERMANENT) {
 642                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 643                                               ifp->prefix_len)) {
 644                                 if (ifa->flags & IFA_F_PERMANENT) {
 645                                         onlink = 1;
 646                                         if (deleted)
 647                                                 break;
 648                                 } else {
 649                                         unsigned long lifetime;
 650
 651                                         if (!onlink)
 652                                                 onlink = -1;
 653
 654                                         spin_lock(&ifa->lock);
 655                                         lifetime = min_t(unsigned long,
 656                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 657                                         if (time_before(expires,
 658                                                         ifa->tstamp + lifetime * HZ))
 659                                                 expires = ifa->tstamp + lifetime * HZ;
 660                                         spin_unlock(&ifa->lock);
 661                                 }
 662                         }
 663                 }
 664         }
 665         write_unlock_bh(&idev->lock);
 666
 667         ipv6_ifa_notify(RTM_DELADDR, ifp);
 668
 669         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 670
 671         addrconf_del_timer(ifp);
 672
 673         /*
 674          * Purge or update corresponding prefix
 675          *
 676          * 1) we don't purge prefix here if address was not permanent.
 677          *    prefix is managed by its own lifetime.
 678          * 2) if there're no addresses, delete prefix.
 679          * 3) if there're still other permanent address(es),
 680          *    corresponding prefix is still permanent.
 681          * 4) otherwise, update prefix lifetime to the
 682          *    longest valid lifetime among the corresponding
 683          *    addresses on the device.
 684          *    Note: subsequent RA will update lifetime.
 685          *
 686          * --yoshfuji
 687          */
 688         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 689                 struct in6_addr prefix;
 690                 struct rt6_info *rt;
 691
 692                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 693                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 694
 695                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 696                         if (onlink == 0) {
 697                                 ip6_del_rt(rt, NULL, NULL);
 698                                 rt = NULL;
 699                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 700                                 rt->rt6i_expires = expires;
 701                                 rt->rt6i_flags |= RTF_EXPIRES;
 702                         }
 703                 }
 704                 dst_release(&rt->u.dst);
 705         }
 706
 707         in6_ifa_put(ifp);
 708 }
 709
 710 #ifdef CONFIG_IPV6_PRIVACY
 711 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 712 {
 713         struct inet6_dev *idev = ifp->idev;
 714         struct in6_addr addr, *tmpaddr;
 715         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 716         int tmp_plen;
 717         int ret = 0;
 718         int max_addresses;
 719
 720         write_lock(&idev->lock);
 721         if (ift) {
 722                 spin_lock_bh(&ift->lock);
 723                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 724                 spin_unlock_bh(&ift->lock);
 725                 tmpaddr = &addr;
 726         } else {
 727                 tmpaddr = NULL;
 728         }
 729 retry:
 730         in6_dev_hold(idev);
 731         if (idev->cnf.use_tempaddr <= 0) {
 732                 write_unlock(&idev->lock);
 733                 printk(KERN_INFO
 734                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 735                 in6_dev_put(idev);
 736                 ret = -1;
 737                 goto out;
 738         }
 739         spin_lock_bh(&ifp->lock);
 740         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 741                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 742                 spin_unlock_bh(&ifp->lock);
 743                 write_unlock(&idev->lock);
 744                 printk(KERN_WARNING
 745                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 746                 in6_dev_put(idev);
 747                 ret = -1;
 748                 goto out;
 749         }
 750         in6_ifa_hold(ifp);
 751         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 752         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 753                 spin_unlock_bh(&ifp->lock);
 754                 write_unlock(&idev->lock);
 755                 printk(KERN_WARNING
 756                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 757                 in6_ifa_put(ifp);
 758                 in6_dev_put(idev);
 759                 ret = -1;
 760                 goto out;
 761         }
 762         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 763         tmp_valid_lft = min_t(__u32,
 764                               ifp->valid_lft,
 765                               idev->cnf.temp_valid_lft);
 766         tmp_prefered_lft = min_t(__u32,
 767                                  ifp->prefered_lft,
 768                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 769         tmp_plen = ifp->prefix_len;
 770         max_addresses = idev->cnf.max_addresses;
 771         tmp_cstamp = ifp->cstamp;
 772         tmp_tstamp = ifp->tstamp;
 773         spin_unlock_bh(&ifp->lock);
 774
 775         write_unlock(&idev->lock);
 776         ift = !max_addresses ||
 777               ipv6_count_addresses(idev) < max_addresses ?
 778                 ipv6_add_addr(idev, &addr, tmp_plen,
 779                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 780         if (!ift || IS_ERR(ift)) {
 781                 in6_ifa_put(ifp);
 782                 in6_dev_put(idev);
 783                 printk(KERN_INFO
 784                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 785                 tmpaddr = &addr;
 786                 write_lock(&idev->lock);
 787                 goto retry;
 788         }
 789
 790         spin_lock_bh(&ift->lock);
 791         ift->ifpub = ifp;
 792         ift->valid_lft = tmp_valid_lft;
 793         ift->prefered_lft = tmp_prefered_lft;
 794         ift->cstamp = tmp_cstamp;
 795         ift->tstamp = tmp_tstamp;
 796         spin_unlock_bh(&ift->lock);
 797
 798         addrconf_dad_start(ift, 0);
 799         in6_ifa_put(ift);
 800         in6_dev_put(idev);
 801 out:
 802         return ret;
 803 }
 804 #endif
 805
 806 /*
 807  *      Choose an appropriate source address
 808  *      should do:
 809  *      i)      get an address with an appropriate scope
 810  *      ii)     see if there is a specific route for the destination and use
 811  *              an address of the attached interface
 812  *      iii)    don't use deprecated addresses
 813  */
 814 static int inline ipv6_saddr_pref(const struct inet6_ifaddr *ifp, u8 invpref)
 815 {
 816         int pref;
 817         pref = ifp->flags&IFA_F_DEPRECATED ? 0 : 2;
 818 #ifdef CONFIG_IPV6_PRIVACY
 819         pref |= (ifp->flags^invpref)&IFA_F_TEMPORARY ? 0 : 1;
 820 #endif
 821         return pref;
 822 }
 823
 824 #ifdef CONFIG_IPV6_PRIVACY
 825 #define IPV6_GET_SADDR_MAXSCORE(score)  ((score) == 3)
 826 #else
 827 #define IPV6_GET_SADDR_MAXSCORE(score)  (score)
 828 #endif
 829
 830 int ipv6_dev_get_saddr(struct net_device *dev,
 831                        struct in6_addr *daddr, struct in6_addr *saddr)
 832 {
 833         struct inet6_ifaddr *ifp = NULL;
 834         struct inet6_ifaddr *match = NULL;
 835         struct inet6_dev *idev;
 836         int scope;
 837         int err;
 838         int hiscore = -1, score;
 839
 840         scope = ipv6_addr_scope(daddr);
 841
 842         /*
 843          *      known dev
 844          *      search dev and walk through dev addresses
 845          */
 846
 847         if (dev) {
 848                 if (dev->flags & IFF_LOOPBACK)
 849                         scope = IFA_HOST;
 850
 851                 read_lock(&addrconf_lock);
 852                 idev = __in6_dev_get(dev);
 853                 if (idev) {
 854                         read_lock_bh(&idev->lock);
 855                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 856                                 if (ifp->scope == scope) {
 857                                         if (ifp->flags&IFA_F_TENTATIVE)
 858                                                 continue;
 859 #ifdef CONFIG_IPV6_PRIVACY
 860                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
 861 #else
 862                                         score = ipv6_saddr_pref(ifp, 0);
 863 #endif
 864                                         if (score <= hiscore)
 865                                                 continue;
 866
 867                                         if (match)
 868                                                 in6_ifa_put(match);
 869                                         match = ifp;
 870                                         hiscore = score;
 871                                         in6_ifa_hold(ifp);
 872
 873                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
 874                                                 read_unlock_bh(&idev->lock);
 875                                                 read_unlock(&addrconf_lock);
 876                                                 goto out;
 877                                         }
 878                                 }
 879                         }
 880                         read_unlock_bh(&idev->lock);
 881                 }
 882                 read_unlock(&addrconf_lock);
 883         }
 884
 885         if (scope == IFA_LINK)
 886                 goto out;
 887
 888         /*
 889          *      dev == NULL or search failed for specified dev
 890          */
 891
 892         read_lock(&dev_base_lock);
 893         read_lock(&addrconf_lock);
 894         for (dev = dev_base; dev; dev=dev->next) {
 895                 idev = __in6_dev_get(dev);
 896                 if (idev) {
 897                         read_lock_bh(&idev->lock);
 898                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 899                                 if (ifp->scope == scope) {
 900                                         if (ifp->flags&IFA_F_TENTATIVE)
 901                                                 continue;
 902 #ifdef CONFIG_IPV6_PRIVACY
 903                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
 904 #else
 905                                         score = ipv6_saddr_pref(ifp, 0);
 906 #endif
 907                                         if (score <= hiscore)
 908                                                 continue;
 909
 910                                         if (match)
 911                                                 in6_ifa_put(match);
 912                                         match = ifp;
 913                                         hiscore = score;
 914                                         in6_ifa_hold(ifp);
 915
 916                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
 917                                                 read_unlock_bh(&idev->lock);
 918                                                 goto out_unlock_base;
 919                                         }
 920                                 }
 921                         }
 922                         read_unlock_bh(&idev->lock);
 923                 }
 924         }
 925
 926 out_unlock_base:
 927         read_unlock(&addrconf_lock);
 928         read_unlock(&dev_base_lock);
 929
 930 out:
 931         err = -EADDRNOTAVAIL;
 932         if (match) {
 933                 ipv6_addr_copy(saddr, &match->addr);
 934                 err = 0;
 935                 in6_ifa_put(match);
 936         }
 937
 938         return err;
 939 }
 940
 941
 942 int ipv6_get_saddr(struct dst_entry *dst,
 943                    struct in6_addr *daddr, struct in6_addr *saddr)
 944 {
 945         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
 946 }
 947
 948
 949 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
 950 {
 951         struct inet6_dev *idev;
 952         int err = -EADDRNOTAVAIL;
 953
 954         read_lock(&addrconf_lock);
 955         if ((idev = __in6_dev_get(dev)) != NULL) {
 956                 struct inet6_ifaddr *ifp;
 957
 958                 read_lock_bh(&idev->lock);
 959                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 960                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
 961                                 ipv6_addr_copy(addr, &ifp->addr);
 962                                 err = 0;
 963                                 break;
 964                         }
 965                 }
 966                 read_unlock_bh(&idev->lock);
 967         }
 968         read_unlock(&addrconf_lock);
 969         return err;
 970 }
 971
 972 static int ipv6_count_addresses(struct inet6_dev *idev)
 973 {
 974         int cnt = 0;
 975         struct inet6_ifaddr *ifp;
 976
 977         read_lock_bh(&idev->lock);
 978         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
 979                 cnt++;
 980         read_unlock_bh(&idev->lock);
 981         return cnt;
 982 }
 983
 984 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
 985 {
 986         struct inet6_ifaddr * ifp;
 987         u8 hash = ipv6_addr_hash(addr);
 988
 989         read_lock_bh(&addrconf_hash_lock);
 990         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
 991                 if (ipv6_addr_equal(&ifp->addr, addr) &&
 992                     !(ifp->flags&IFA_F_TENTATIVE)) {
 993                         if (dev == NULL || ifp->idev->dev == dev ||
 994                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
 995                                 break;
 996                 }
 997         }
 998         read_unlock_bh(&addrconf_hash_lock);
 999         return ifp != NULL;
1000 }
1001
1002 static
1003 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1004 {
1005         struct inet6_ifaddr * ifp;
1006         u8 hash = ipv6_addr_hash(addr);
1007
1008         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1009                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1010                         if (dev == NULL || ifp->idev->dev == dev)
1011                                 break;
1012                 }
1013         }
1014         return ifp != NULL;
1015 }
1016
1017 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1018 {
1019         struct inet6_ifaddr * ifp;
1020         u8 hash = ipv6_addr_hash(addr);
1021
1022         read_lock_bh(&addrconf_hash_lock);
1023         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1024                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1025                         if (dev == NULL || ifp->idev->dev == dev ||
1026                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1027                                 in6_ifa_hold(ifp);
1028                                 break;
1029                         }
1030                 }
1031         }
1032         read_unlock_bh(&addrconf_hash_lock);
1033
1034         return ifp;
1035 }
1036
1037 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1038 {
1039         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1040         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1041         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1042         u32 sk2_rcv_saddr = tcp_v4_rcv_saddr(sk2);
1043         int sk_ipv6only = ipv6_only_sock(sk);
1044         int sk2_ipv6only = tcp_v6_ipv6only(sk2);
1045         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1046         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1047
1048         if (!sk2_rcv_saddr && !sk_ipv6only)
1049                 return 1;
1050
1051         if (addr_type2 == IPV6_ADDR_ANY &&
1052             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1053                 return 1;
1054
1055         if (addr_type == IPV6_ADDR_ANY &&
1056             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1057                 return 1;
1058
1059         if (sk2_rcv_saddr6 &&
1060             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1061                 return 1;
1062
1063         if (addr_type == IPV6_ADDR_MAPPED &&
1064             !sk2_ipv6only &&
1065             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1066                 return 1;
1067
1068         return 0;
1069 }
1070
1071 /* Gets referenced address, destroys ifaddr */
1072
1073 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1074 {
1075         if (net_ratelimit())
1076                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1077         if (ifp->flags&IFA_F_PERMANENT) {
1078                 spin_lock_bh(&ifp->lock);
1079                 addrconf_del_timer(ifp);
1080                 ifp->flags |= IFA_F_TENTATIVE;
1081                 spin_unlock_bh(&ifp->lock);
1082                 in6_ifa_put(ifp);
1083 #ifdef CONFIG_IPV6_PRIVACY
1084         } else if (ifp->flags&IFA_F_TEMPORARY) {
1085                 struct inet6_ifaddr *ifpub;
1086                 spin_lock_bh(&ifp->lock);
1087                 ifpub = ifp->ifpub;
1088                 if (ifpub) {
1089                         in6_ifa_hold(ifpub);
1090                         spin_unlock_bh(&ifp->lock);
1091                         ipv6_create_tempaddr(ifpub, ifp);
1092                         in6_ifa_put(ifpub);
1093                 } else {
1094                         spin_unlock_bh(&ifp->lock);
1095                 }
1096                 ipv6_del_addr(ifp);
1097 #endif
1098         } else
1099                 ipv6_del_addr(ifp);
1100 }
1101
1102
1103 /* Join to solicited addr multicast group. */
1104
1105 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1106 {
1107         struct in6_addr maddr;
1108
1109         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1110                 return;
1111
1112         addrconf_addr_solict_mult(addr, &maddr);
1113         ipv6_dev_mc_inc(dev, &maddr);
1114 }
1115
1116 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1117 {
1118         struct in6_addr maddr;
1119
1120         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1121                 return;
1122
1123         addrconf_addr_solict_mult(addr, &maddr);
1124         __ipv6_dev_mc_dec(idev, &maddr);
1125 }
1126
1127 void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1128 {
1129         struct in6_addr addr;
1130         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1131         if (ipv6_addr_any(&addr))
1132                 return;
1133         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1134 }
1135
1136 void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1137 {
1138         struct in6_addr addr;
1139         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1140         if (ipv6_addr_any(&addr))
1141                 return;
1142         __ipv6_dev_ac_dec(ifp->idev, &addr);
1143 }
1144
1145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1146 {
1147         switch (dev->type) {
1148         case ARPHRD_ETHER:
1149         case ARPHRD_FDDI:
1150         case ARPHRD_IEEE802_TR:
1151                 if (dev->addr_len != ETH_ALEN)
1152                         return -1;
1153                 memcpy(eui, dev->dev_addr, 3);
1154                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1155
1156                 /*
1157                  * The zSeries OSA network cards can be shared among various
1158                  * OS instances, but the OSA cards have only one MAC address.
1159                  * This leads to duplicate address conflicts in conjunction
1160                  * with IPv6 if more than one instance uses the same card.
1161                  *
1162                  * The driver for these cards can deliver a unique 16-bit
1163                  * identifier for each instance sharing the same card.  It is
1164                  * placed instead of 0xFFFE in the interface identifier.  The
1165                  * "u" bit of the interface identifier is not inverted in this
1166                  * case.  Hence the resulting interface identifier has local
1167                  * scope according to RFC2373.
1168                  */
1169                 if (dev->dev_id) {
1170                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1171                         eui[4] = dev->dev_id & 0xFF;
1172                 } else {
1173                         eui[3] = 0xFF;
1174                         eui[4] = 0xFE;
1175                         eui[0] ^= 2;
1176                 }
1177                 return 0;
1178         case ARPHRD_ARCNET:
1179                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1180                 if (dev->addr_len != ARCNET_ALEN)
1181                         return -1;
1182                 memset(eui, 0, 7);
1183                 eui[7] = *(u8*)dev->dev_addr;
1184                 return 0;
1185         case ARPHRD_INFINIBAND:
1186                 if (dev->addr_len != INFINIBAND_ALEN)
1187                         return -1;
1188                 memcpy(eui, dev->dev_addr + 12, 8);
1189                 eui[0] |= 2;
1190                 return 0;
1191         }
1192         return -1;
1193 }
1194
1195 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1196 {
1197         int err = -1;
1198         struct inet6_ifaddr *ifp;
1199
1200         read_lock_bh(&idev->lock);
1201         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1202                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1203                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1204                         err = 0;
1205                         break;
1206                 }
1207         }
1208         read_unlock_bh(&idev->lock);
1209         return err;
1210 }
1211
1212 #ifdef CONFIG_IPV6_PRIVACY
1213 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1214 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1215 {
1216         struct net_device *dev;
1217         struct scatterlist sg[2];
1218
1219         sg[0].page = virt_to_page(idev->entropy);
1220         sg[0].offset = offset_in_page(idev->entropy);
1221         sg[0].length = 8;
1222         sg[1].page = virt_to_page(idev->work_eui64);
1223         sg[1].offset = offset_in_page(idev->work_eui64);
1224         sg[1].length = 8;
1225
1226         dev = idev->dev;
1227
1228         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1229                 printk(KERN_INFO
1230                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1231                         idev);
1232                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1233         }
1234 regen:
1235         spin_lock(&md5_tfm_lock);
1236         if (unlikely(md5_tfm == NULL)) {
1237                 spin_unlock(&md5_tfm_lock);
1238                 return -1;
1239         }
1240         crypto_digest_init(md5_tfm);
1241         crypto_digest_update(md5_tfm, sg, 2);
1242         crypto_digest_final(md5_tfm, idev->work_digest);
1243         spin_unlock(&md5_tfm_lock);
1244
1245         memcpy(idev->rndid, &idev->work_digest[0], 8);
1246         idev->rndid[0] &= ~0x02;
1247         memcpy(idev->entropy, &idev->work_digest[8], 8);
1248
1249         /*
1250          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1251          * check if generated address is not inappropriate
1252          *
1253          *  - Reserved subnet anycast (RFC 2526)
1254          *      11111101 11....11 1xxxxxxx
1255          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1256          *      00-00-5E-FE-xx-xx-xx-xx
1257          *  - value 0
1258          *  - XXX: already assigned to an address on the device
1259          */
1260         if (idev->rndid[0] == 0xfd &&
1261             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1262             (idev->rndid[7]&0x80))
1263                 goto regen;
1264         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1265                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1266                         goto regen;
1267                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1268                         goto regen;
1269         }
1270
1271         return 0;
1272 }
1273
1274 static void ipv6_regen_rndid(unsigned long data)
1275 {
1276         struct inet6_dev *idev = (struct inet6_dev *) data;
1277         unsigned long expires;
1278
1279         read_lock_bh(&addrconf_lock);
1280         write_lock_bh(&idev->lock);
1281
1282         if (idev->dead)
1283                 goto out;
1284
1285         if (__ipv6_regen_rndid(idev) < 0)
1286                 goto out;
1287
1288         expires = jiffies +
1289                 idev->cnf.temp_prefered_lft * HZ -
1290                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1291         if (time_before(expires, jiffies)) {
1292                 printk(KERN_WARNING
1293                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1294                         idev->dev->name);
1295                 goto out;
1296         }
1297
1298         if (!mod_timer(&idev->regen_timer, expires))
1299                 in6_dev_hold(idev);
1300
1301 out:
1302         write_unlock_bh(&idev->lock);
1303         read_unlock_bh(&addrconf_lock);
1304         in6_dev_put(idev);
1305 }
1306
1307 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1308         int ret = 0;
1309
1310         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1311                 ret = __ipv6_regen_rndid(idev);
1312         return ret;
1313 }
1314 #endif
1315
1316 /*
1317  *      Add prefix route.
1318  */
1319
1320 static void
1321 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1322                       unsigned long expires, unsigned flags)
1323 {
1324         struct in6_rtmsg rtmsg;
1325
1326         memset(&rtmsg, 0, sizeof(rtmsg));
1327         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1328         rtmsg.rtmsg_dst_len = plen;
1329         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1330         rtmsg.rtmsg_ifindex = dev->ifindex;
1331         rtmsg.rtmsg_info = expires;
1332         rtmsg.rtmsg_flags = RTF_UP|flags;
1333         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1334
1335         /* Prevent useless cloning on PtP SIT.
1336            This thing is done here expecting that the whole
1337            class of non-broadcast devices need not cloning.
1338          */
1339         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1340                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1341
1342         ip6_route_add(&rtmsg, NULL, NULL);
1343 }
1344
1345 /* Create "default" multicast route to the interface */
1346
1347 static void addrconf_add_mroute(struct net_device *dev)
1348 {
1349         struct in6_rtmsg rtmsg;
1350
1351         memset(&rtmsg, 0, sizeof(rtmsg));
1352         ipv6_addr_set(&rtmsg.rtmsg_dst,
1353                       htonl(0xFF000000), 0, 0, 0);
1354         rtmsg.rtmsg_dst_len = 8;
1355         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1356         rtmsg.rtmsg_ifindex = dev->ifindex;
1357         rtmsg.rtmsg_flags = RTF_UP;
1358         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1359         ip6_route_add(&rtmsg, NULL, NULL);
1360 }
1361
1362 static void sit_route_add(struct net_device *dev)
1363 {
1364         struct in6_rtmsg rtmsg;
1365
1366         memset(&rtmsg, 0, sizeof(rtmsg));
1367
1368         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1369         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1370
1371         /* prefix length - 96 bits "::d.d.d.d" */
1372         rtmsg.rtmsg_dst_len     = 96;
1373         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1374         rtmsg.rtmsg_ifindex     = dev->ifindex;
1375
1376         ip6_route_add(&rtmsg, NULL, NULL);
1377 }
1378
1379 static void addrconf_add_lroute(struct net_device *dev)
1380 {
1381         struct in6_addr addr;
1382
1383         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1384         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1385 }
1386
1387 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1388 {
1389         struct inet6_dev *idev;
1390
1391         ASSERT_RTNL();
1392
1393         if ((idev = ipv6_find_idev(dev)) == NULL)
1394                 return NULL;
1395
1396         /* Add default multicast route */
1397         addrconf_add_mroute(dev);
1398
1399         /* Add link local route */
1400         addrconf_add_lroute(dev);
1401         return idev;
1402 }
1403
1404 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1405 {
1406         struct prefix_info *pinfo;
1407         __u32 valid_lft;
1408         __u32 prefered_lft;
1409         int addr_type;
1410         unsigned long rt_expires;
1411         struct inet6_dev *in6_dev;
1412
1413         pinfo = (struct prefix_info *) opt;
1414
1415         if (len < sizeof(struct prefix_info)) {
1416                 ADBG(("addrconf: prefix option too short\n"));
1417                 return;
1418         }
1419
1420         /*
1421          *      Validation checks ([ADDRCONF], page 19)
1422          */
1423
1424         addr_type = ipv6_addr_type(&pinfo->prefix);
1425
1426         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1427                 return;
1428
1429         valid_lft = ntohl(pinfo->valid);
1430         prefered_lft = ntohl(pinfo->prefered);
1431
1432         if (prefered_lft > valid_lft) {
1433                 if (net_ratelimit())
1434                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1435                 return;
1436         }
1437
1438         in6_dev = in6_dev_get(dev);
1439
1440         if (in6_dev == NULL) {
1441                 if (net_ratelimit())
1442                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1443                 return;
1444         }
1445
1446         /*
1447          *      Two things going on here:
1448          *      1) Add routes for on-link prefixes
1449          *      2) Configure prefixes with the auto flag set
1450          */
1451
1452         /* Avoid arithmetic overflow. Really, we could
1453            save rt_expires in seconds, likely valid_lft,
1454            but it would require division in fib gc, that it
1455            not good.
1456          */
1457         if (valid_lft >= 0x7FFFFFFF/HZ)
1458                 rt_expires = 0;
1459         else
1460                 rt_expires = jiffies + valid_lft * HZ;
1461
1462         if (pinfo->onlink) {
1463                 struct rt6_info *rt;
1464                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1465
1466                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1467                         if (rt->rt6i_flags&RTF_EXPIRES) {
1468                                 if (valid_lft == 0) {
1469                                         ip6_del_rt(rt, NULL, NULL);
1470                                         rt = NULL;
1471                                 } else {
1472                                         rt->rt6i_expires = rt_expires;
1473                                 }
1474                         }
1475                 } else if (valid_lft) {
1476                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1477                                               dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1478                 }
1479                 if (rt)
1480                         dst_release(&rt->u.dst);
1481         }
1482
1483         /* Try to figure out our local address for this prefix */
1484
1485         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1486                 struct inet6_ifaddr * ifp;
1487                 struct in6_addr addr;
1488                 int create = 0, update_lft = 0;
1489
1490                 if (pinfo->prefix_len == 64) {
1491                         memcpy(&addr, &pinfo->prefix, 8);
1492                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1493                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1494                                 in6_dev_put(in6_dev);
1495                                 return;
1496                         }
1497                         goto ok;
1498                 }
1499                 if (net_ratelimit())
1500                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1501                                pinfo->prefix_len);
1502                 in6_dev_put(in6_dev);
1503                 return;
1504
1505 ok:
1506
1507                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1508
1509                 if (ifp == NULL && valid_lft) {
1510                         int max_addresses = in6_dev->cnf.max_addresses;
1511
1512                         /* Do not allow to create too much of autoconfigured
1513                          * addresses; this would be too easy way to crash kernel.
1514                          */
1515                         if (!max_addresses ||
1516                             ipv6_count_addresses(in6_dev) < max_addresses)
1517                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1518                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1519
1520                         if (!ifp || IS_ERR(ifp)) {
1521                                 in6_dev_put(in6_dev);
1522                                 return;
1523                         }
1524
1525                         update_lft = create = 1;
1526                         ifp->cstamp = jiffies;
1527                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1528                 }
1529
1530                 if (ifp) {
1531                         int flags;
1532                         unsigned long now;
1533 #ifdef CONFIG_IPV6_PRIVACY
1534                         struct inet6_ifaddr *ift;
1535 #endif
1536                         u32 stored_lft;
1537
1538                         /* update lifetime (RFC2462 5.5.3 e) */
1539                         spin_lock(&ifp->lock);
1540                         now = jiffies;
1541                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1542                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1543                         else
1544                                 stored_lft = 0;
1545                         if (!update_lft && stored_lft) {
1546                                 if (valid_lft > MIN_VALID_LIFETIME ||
1547                                     valid_lft > stored_lft)
1548                                         update_lft = 1;
1549                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1550                                         /* valid_lft <= stored_lft is always true */
1551                                         /* XXX: IPsec */
1552                                         update_lft = 0;
1553                                 } else {
1554                                         valid_lft = MIN_VALID_LIFETIME;
1555                                         if (valid_lft < prefered_lft)
1556                                                 prefered_lft = valid_lft;
1557                                         update_lft = 1;
1558                                 }
1559                         }
1560
1561                         if (update_lft) {
1562                                 ifp->valid_lft = valid_lft;
1563                                 ifp->prefered_lft = prefered_lft;
1564                                 ifp->tstamp = now;
1565                                 flags = ifp->flags;
1566                                 ifp->flags &= ~IFA_F_DEPRECATED;
1567                                 spin_unlock(&ifp->lock);
1568
1569                                 if (!(flags&IFA_F_TENTATIVE))
1570                                         ipv6_ifa_notify(0, ifp);
1571                         } else
1572                                 spin_unlock(&ifp->lock);
1573
1574 #ifdef CONFIG_IPV6_PRIVACY
1575                         read_lock_bh(&in6_dev->lock);
1576                         /* update all temporary addresses in the list */
1577                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1578                                 /*
1579                                  * When adjusting the lifetimes of an existing
1580                                  * temporary address, only lower the lifetimes.
1581                                  * Implementations must not increase the
1582                                  * lifetimes of an existing temporary address
1583                                  * when processing a Prefix Information Option.
1584                                  */
1585                                 spin_lock(&ift->lock);
1586                                 flags = ift->flags;
1587                                 if (ift->valid_lft > valid_lft &&
1588                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1589                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1590                                 if (ift->prefered_lft > prefered_lft &&
1591                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1592                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1593                                 spin_unlock(&ift->lock);
1594                                 if (!(flags&IFA_F_TENTATIVE))
1595                                         ipv6_ifa_notify(0, ift);
1596                         }
1597
1598                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1599                                 /*
1600                                  * When a new public address is created as described in [ADDRCONF],
1601                                  * also create a new temporary address.
1602                                  */
1603                                 read_unlock_bh(&in6_dev->lock);
1604                                 ipv6_create_tempaddr(ifp, NULL);
1605                         } else {
1606                                 read_unlock_bh(&in6_dev->lock);
1607                         }
1608 #endif
1609                         in6_ifa_put(ifp);
1610                         addrconf_verify(0);
1611                 }
1612         }
1613         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1614         in6_dev_put(in6_dev);
1615 }
1616
1617 /*
1618  *      Set destination address.
1619  *      Special case for SIT interfaces where we create a new "virtual"
1620  *      device.
1621  */
1622 int addrconf_set_dstaddr(void __user *arg)
1623 {
1624         struct in6_ifreq ireq;
1625         struct net_device *dev;
1626         int err = -EINVAL;
1627
1628         rtnl_lock();
1629
1630         err = -EFAULT;
1631         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1632                 goto err_exit;
1633
1634         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1635
1636         err = -ENODEV;
1637         if (dev == NULL)
1638                 goto err_exit;
1639
1640         if (dev->type == ARPHRD_SIT) {
1641                 struct ifreq ifr;
1642                 mm_segment_t    oldfs;
1643                 struct ip_tunnel_parm p;
1644
1645                 err = -EADDRNOTAVAIL;
1646                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1647                         goto err_exit;
1648
1649                 memset(&p, 0, sizeof(p));
1650                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1651                 p.iph.saddr = 0;
1652                 p.iph.version = 4;
1653                 p.iph.ihl = 5;
1654                 p.iph.protocol = IPPROTO_IPV6;
1655                 p.iph.ttl = 64;
1656                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1657
1658                 oldfs = get_fs(); set_fs(KERNEL_DS);
1659                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1660                 set_fs(oldfs);
1661
1662                 if (err == 0) {
1663                         err = -ENOBUFS;
1664                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1665                                 goto err_exit;
1666                         err = dev_open(dev);
1667                 }
1668         }
1669
1670 err_exit:
1671         rtnl_unlock();
1672         return err;
1673 }
1674
1675 /*
1676  *      Manual configuration of address on an interface
1677  */
1678 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1679 {
1680         struct inet6_ifaddr *ifp;
1681         struct inet6_dev *idev;
1682         struct net_device *dev;
1683         int scope;
1684
1685         ASSERT_RTNL();
1686
1687         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1688                 return -ENODEV;
1689
1690         if (!(dev->flags&IFF_UP))
1691                 return -ENETDOWN;
1692
1693         if ((idev = addrconf_add_dev(dev)) == NULL)
1694                 return -ENOBUFS;
1695
1696         scope = ipv6_addr_scope(pfx);
1697
1698         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1699         if (!IS_ERR(ifp)) {
1700                 addrconf_dad_start(ifp, 0);
1701                 in6_ifa_put(ifp);
1702                 return 0;
1703         }
1704
1705         return PTR_ERR(ifp);
1706 }
1707
1708 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1709 {
1710         struct inet6_ifaddr *ifp;
1711         struct inet6_dev *idev;
1712         struct net_device *dev;
1713
1714         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1715                 return -ENODEV;
1716
1717         if ((idev = __in6_dev_get(dev)) == NULL)
1718                 return -ENXIO;
1719
1720         read_lock_bh(&idev->lock);
1721         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1722                 if (ifp->prefix_len == plen &&
1723                     ipv6_addr_equal(pfx, &ifp->addr)) {
1724                         in6_ifa_hold(ifp);
1725                         read_unlock_bh(&idev->lock);
1726
1727                         ipv6_del_addr(ifp);
1728
1729                         /* If the last address is deleted administratively,
1730                            disable IPv6 on this interface.
1731                          */
1732                         if (idev->addr_list == NULL)
1733                                 addrconf_ifdown(idev->dev, 1);
1734                         return 0;
1735                 }
1736         }
1737         read_unlock_bh(&idev->lock);
1738         return -EADDRNOTAVAIL;
1739 }
1740
1741
1742 int addrconf_add_ifaddr(void __user *arg)
1743 {
1744         struct in6_ifreq ireq;
1745         int err;
1746
1747         if (!capable(CAP_NET_ADMIN))
1748                 return -EPERM;
1749
1750         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1751                 return -EFAULT;
1752
1753         rtnl_lock();
1754         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1755         rtnl_unlock();
1756         return err;
1757 }
1758
1759 int addrconf_del_ifaddr(void __user *arg)
1760 {
1761         struct in6_ifreq ireq;
1762         int err;
1763
1764         if (!capable(CAP_NET_ADMIN))
1765                 return -EPERM;
1766
1767         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1768                 return -EFAULT;
1769
1770         rtnl_lock();
1771         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1772         rtnl_unlock();
1773         return err;
1774 }
1775
1776 static void sit_add_v4_addrs(struct inet6_dev *idev)
1777 {
1778         struct inet6_ifaddr * ifp;
1779         struct in6_addr addr;
1780         struct net_device *dev;
1781         int scope;
1782
1783         ASSERT_RTNL();
1784
1785         memset(&addr, 0, sizeof(struct in6_addr));
1786         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1787
1788         if (idev->dev->flags&IFF_POINTOPOINT) {
1789                 addr.s6_addr32[0] = htonl(0xfe800000);
1790                 scope = IFA_LINK;
1791         } else {
1792                 scope = IPV6_ADDR_COMPATv4;
1793         }
1794
1795         if (addr.s6_addr32[3]) {
1796                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1797                 if (!IS_ERR(ifp)) {
1798                         spin_lock_bh(&ifp->lock);
1799                         ifp->flags &= ~IFA_F_TENTATIVE;
1800                         spin_unlock_bh(&ifp->lock);
1801                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1802                         in6_ifa_put(ifp);
1803                 }
1804                 return;
1805         }
1806
1807         for (dev = dev_base; dev != NULL; dev = dev->next) {
1808                 struct in_device * in_dev = __in_dev_get(dev);
1809                 if (in_dev && (dev->flags & IFF_UP)) {
1810                         struct in_ifaddr * ifa;
1811
1812                         int flag = scope;
1813
1814                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1815                                 int plen;
1816
1817                                 addr.s6_addr32[3] = ifa->ifa_local;
1818
1819                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1820                                         continue;
1821                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1822                                         if (idev->dev->flags&IFF_POINTOPOINT)
1823                                                 continue;
1824                                         flag |= IFA_HOST;
1825                                 }
1826                                 if (idev->dev->flags&IFF_POINTOPOINT)
1827                                         plen = 64;
1828                                 else
1829                                         plen = 96;
1830
1831                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1832                                                     IFA_F_PERMANENT);
1833                                 if (!IS_ERR(ifp)) {
1834                                         spin_lock_bh(&ifp->lock);
1835                                         ifp->flags &= ~IFA_F_TENTATIVE;
1836                                         spin_unlock_bh(&ifp->lock);
1837                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1838                                         in6_ifa_put(ifp);
1839                                 }
1840                         }
1841                 }
1842         }
1843 }
1844
1845 static void init_loopback(struct net_device *dev)
1846 {
1847         struct inet6_dev  *idev;
1848         struct inet6_ifaddr * ifp;
1849
1850         /* ::1 */
1851
1852         ASSERT_RTNL();
1853
1854         if ((idev = ipv6_find_idev(dev)) == NULL) {
1855                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1856                 return;
1857         }
1858
1859         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1860         if (!IS_ERR(ifp)) {
1861                 spin_lock_bh(&ifp->lock);
1862                 ifp->flags &= ~IFA_F_TENTATIVE;
1863                 spin_unlock_bh(&ifp->lock);
1864                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1865                 in6_ifa_put(ifp);
1866         }
1867 }
1868
1869 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
1870 {
1871         struct inet6_ifaddr * ifp;
1872
1873         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
1874         if (!IS_ERR(ifp)) {
1875                 addrconf_dad_start(ifp, 0);
1876                 in6_ifa_put(ifp);
1877         }
1878 }
1879
1880 static void addrconf_dev_config(struct net_device *dev)
1881 {
1882         struct in6_addr addr;
1883         struct inet6_dev    * idev;
1884
1885         ASSERT_RTNL();
1886
1887         if ((dev->type != ARPHRD_ETHER) &&
1888             (dev->type != ARPHRD_FDDI) &&
1889             (dev->type != ARPHRD_IEEE802_TR) &&
1890             (dev->type != ARPHRD_ARCNET) &&
1891             (dev->type != ARPHRD_INFINIBAND)) {
1892                 /* Alas, we support only Ethernet autoconfiguration. */
1893                 return;
1894         }
1895
1896         idev = addrconf_add_dev(dev);
1897         if (idev == NULL)
1898                 return;
1899
1900         memset(&addr, 0, sizeof(struct in6_addr));
1901         addr.s6_addr32[0] = htonl(0xFE800000);
1902
1903         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
1904                 addrconf_add_linklocal(idev, &addr);
1905 }
1906
1907 static void addrconf_sit_config(struct net_device *dev)
1908 {
1909         struct inet6_dev *idev;
1910
1911         ASSERT_RTNL();
1912
1913         /*
1914          * Configure the tunnel with one of our IPv4
1915          * addresses... we should configure all of
1916          * our v4 addrs in the tunnel
1917          */
1918
1919         if ((idev = ipv6_find_idev(dev)) == NULL) {
1920                 printk(KERN_DEBUG "init sit: add_dev failed\n");
1921                 return;
1922         }
1923
1924         sit_add_v4_addrs(idev);
1925
1926         if (dev->flags&IFF_POINTOPOINT) {
1927                 addrconf_add_mroute(dev);
1928                 addrconf_add_lroute(dev);
1929         } else
1930                 sit_route_add(dev);
1931 }
1932
1933 static inline int
1934 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
1935 {
1936         struct in6_addr lladdr;
1937
1938         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
1939                 addrconf_add_linklocal(idev, &lladdr);
1940                 return 0;
1941         }
1942         return -1;
1943 }
1944
1945 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
1946 {
1947         struct net_device *link_dev;
1948
1949         /* first try to inherit the link-local address from the link device */
1950         if (idev->dev->iflink &&
1951             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
1952                 if (!ipv6_inherit_linklocal(idev, link_dev))
1953                         return;
1954         }
1955         /* then try to inherit it from any device */
1956         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
1957                 if (!ipv6_inherit_linklocal(idev, link_dev))
1958                         return;
1959         }
1960         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
1961 }
1962
1963 /*
1964  * Autoconfigure tunnel with a link-local address so routing protocols,
1965  * DHCPv6, MLD etc. can be run over the virtual link
1966  */
1967
1968 static void addrconf_ip6_tnl_config(struct net_device *dev)
1969 {
1970         struct inet6_dev *idev;
1971
1972         ASSERT_RTNL();
1973
1974         if ((idev = addrconf_add_dev(dev)) == NULL) {
1975                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
1976                 return;
1977         }
1978         ip6_tnl_add_linklocal(idev);
1979         addrconf_add_mroute(dev);
1980 }
1981
1982 static int addrconf_notify(struct notifier_block *this, unsigned long event,
1983                            void * data)
1984 {
1985         struct net_device *dev = (struct net_device *) data;
1986         struct inet6_dev *idev = __in6_dev_get(dev);
1987
1988         switch(event) {
1989         case NETDEV_UP:
1990                 switch(dev->type) {
1991                 case ARPHRD_SIT:
1992                         addrconf_sit_config(dev);
1993                         break;
1994                 case ARPHRD_TUNNEL6:
1995                         addrconf_ip6_tnl_config(dev);
1996                         break;
1997                 case ARPHRD_LOOPBACK:
1998                         init_loopback(dev);
1999                         break;
2000
2001                 default:
2002                         addrconf_dev_config(dev);
2003                         break;
2004                 };
2005                 if (idev) {
2006                         /* If the MTU changed during the interface down, when the
2007                            interface up, the changed MTU must be reflected in the
2008                            idev as well as routers.
2009                          */
2010                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2011                                 rt6_mtu_change(dev, dev->mtu);
2012                                 idev->cnf.mtu6 = dev->mtu;
2013                         }
2014                         idev->tstamp = jiffies;
2015                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2016                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2017                            stop IPv6 on this interface.
2018                          */
2019                         if (dev->mtu < IPV6_MIN_MTU)
2020                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2021                 }
2022                 break;
2023
2024         case NETDEV_CHANGEMTU:
2025                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2026                         rt6_mtu_change(dev, dev->mtu);
2027                         idev->cnf.mtu6 = dev->mtu;
2028                         break;
2029                 }
2030
2031                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2032
2033         case NETDEV_DOWN:
2034         case NETDEV_UNREGISTER:
2035                 /*
2036                  *      Remove all addresses from this interface.
2037                  */
2038                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2039                 break;
2040         case NETDEV_CHANGE:
2041                 break;
2042         case NETDEV_CHANGENAME:
2043 #ifdef CONFIG_SYSCTL
2044                 if (idev) {
2045                         addrconf_sysctl_unregister(&idev->cnf);
2046                         neigh_sysctl_unregister(idev->nd_parms);
2047                         neigh_sysctl_register(dev, idev->nd_parms,
2048                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2049                                               &ndisc_ifinfo_sysctl_change,
2050                                               NULL);
2051                         addrconf_sysctl_register(idev, &idev->cnf);
2052                 }
2053 #endif
2054                 break;
2055         };
2056
2057         return NOTIFY_OK;
2058 }
2059
2060 /*
2061  *      addrconf module should be notified of a device going up
2062  */
2063 static struct notifier_block ipv6_dev_notf = {
2064         .notifier_call = addrconf_notify,
2065         .priority = 0
2066 };
2067
2068 static int addrconf_ifdown(struct net_device *dev, int how)
2069 {
2070         struct inet6_dev *idev;
2071         struct inet6_ifaddr *ifa, **bifa;
2072         int i;
2073
2074         ASSERT_RTNL();
2075
2076         if (dev == &loopback_dev && how == 1)
2077                 how = 0;
2078
2079         rt6_ifdown(dev);
2080         neigh_ifdown(&nd_tbl, dev);
2081
2082         idev = __in6_dev_get(dev);
2083         if (idev == NULL)
2084                 return -ENODEV;
2085
2086         /* Step 1: remove reference to ipv6 device from parent device.
2087                    Do not dev_put!
2088          */
2089         if (how == 1) {
2090                 write_lock_bh(&addrconf_lock);
2091                 dev->ip6_ptr = NULL;
2092                 idev->dead = 1;
2093                 write_unlock_bh(&addrconf_lock);
2094
2095                 /* Step 1.5: remove snmp6 entry */
2096                 snmp6_unregister_dev(idev);
2097
2098         }
2099
2100         /* Step 2: clear hash table */
2101         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2102                 bifa = &inet6_addr_lst[i];
2103
2104                 write_lock_bh(&addrconf_hash_lock);
2105                 while ((ifa = *bifa) != NULL) {
2106                         if (ifa->idev == idev) {
2107                                 *bifa = ifa->lst_next;
2108                                 ifa->lst_next = NULL;
2109                                 addrconf_del_timer(ifa);
2110                                 in6_ifa_put(ifa);
2111                                 continue;
2112                         }
2113                         bifa = &ifa->lst_next;
2114                 }
2115                 write_unlock_bh(&addrconf_hash_lock);
2116         }
2117
2118         write_lock_bh(&idev->lock);
2119
2120         /* Step 3: clear flags for stateless addrconf */
2121         if (how != 1)
2122                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2123
2124         /* Step 4: clear address list */
2125 #ifdef CONFIG_IPV6_PRIVACY
2126         if (how == 1 && del_timer(&idev->regen_timer))
2127                 in6_dev_put(idev);
2128
2129         /* clear tempaddr list */
2130         while ((ifa = idev->tempaddr_list) != NULL) {
2131                 idev->tempaddr_list = ifa->tmp_next;
2132                 ifa->tmp_next = NULL;
2133                 ifa->dead = 1;
2134                 write_unlock_bh(&idev->lock);
2135                 spin_lock_bh(&ifa->lock);
2136
2137                 if (ifa->ifpub) {
2138                         in6_ifa_put(ifa->ifpub);
2139                         ifa->ifpub = NULL;
2140                 }
2141                 spin_unlock_bh(&ifa->lock);
2142                 in6_ifa_put(ifa);
2143                 write_lock_bh(&idev->lock);
2144         }
2145 #endif
2146         while ((ifa = idev->addr_list) != NULL) {
2147                 idev->addr_list = ifa->if_next;
2148                 ifa->if_next = NULL;
2149                 ifa->dead = 1;
2150                 addrconf_del_timer(ifa);
2151                 write_unlock_bh(&idev->lock);
2152
2153                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2154                 in6_ifa_put(ifa);
2155
2156                 write_lock_bh(&idev->lock);
2157         }
2158         write_unlock_bh(&idev->lock);
2159
2160         /* Step 5: Discard multicast list */
2161
2162         if (how == 1)
2163                 ipv6_mc_destroy_dev(idev);
2164         else
2165                 ipv6_mc_down(idev);
2166
2167         /* Step 5: netlink notification of this interface */
2168         idev->tstamp = jiffies;
2169         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2170
2171         /* Shot the device (if unregistered) */
2172
2173         if (how == 1) {
2174 #ifdef CONFIG_SYSCTL
2175                 addrconf_sysctl_unregister(&idev->cnf);
2176                 neigh_sysctl_unregister(idev->nd_parms);
2177 #endif
2178                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2179                 neigh_ifdown(&nd_tbl, dev);
2180                 in6_dev_put(idev);
2181         }
2182         return 0;
2183 }
2184
2185 static void addrconf_rs_timer(unsigned long data)
2186 {
2187         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2188
2189         if (ifp->idev->cnf.forwarding)
2190                 goto out;
2191
2192         if (ifp->idev->if_flags & IF_RA_RCVD) {
2193                 /*
2194                  *      Announcement received after solicitation
2195                  *      was sent
2196                  */
2197                 goto out;
2198         }
2199
2200         spin_lock(&ifp->lock);
2201         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2202                 struct in6_addr all_routers;
2203
2204                 /* The wait after the last probe can be shorter */
2205                 addrconf_mod_timer(ifp, AC_RS,
2206                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2207                                    ifp->idev->cnf.rtr_solicit_delay :
2208                                    ifp->idev->cnf.rtr_solicit_interval);
2209                 spin_unlock(&ifp->lock);
2210
2211                 ipv6_addr_all_routers(&all_routers);
2212
2213                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2214         } else {
2215                 spin_unlock(&ifp->lock);
2216                 /*
2217                  * Note: we do not support deprecated "all on-link"
2218                  * assumption any longer.
2219                  */
2220                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2221                        ifp->idev->dev->name);
2222         }
2223
2224 out:
2225         in6_ifa_put(ifp);
2226 }
2227
2228 /*
2229  *      Duplicate Address Detection
2230  */
2231 static void addrconf_dad_start(struct inet6_ifaddr *ifp, int flags)
2232 {
2233         struct inet6_dev *idev = ifp->idev;
2234         struct net_device *dev = idev->dev;
2235         unsigned long rand_num;
2236
2237         addrconf_join_solict(dev, &ifp->addr);
2238
2239         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2240                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2241                                         flags);
2242
2243         net_srandom(ifp->addr.s6_addr32[3]);
2244         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2245
2246         read_lock_bh(&idev->lock);
2247         if (ifp->dead)
2248                 goto out;
2249         spin_lock_bh(&ifp->lock);
2250
2251         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2252             !(ifp->flags&IFA_F_TENTATIVE)) {
2253                 ifp->flags &= ~IFA_F_TENTATIVE;
2254                 spin_unlock_bh(&ifp->lock);
2255                 read_unlock_bh(&idev->lock);
2256
2257                 addrconf_dad_completed(ifp);
2258                 return;
2259         }
2260
2261         ifp->probes = idev->cnf.dad_transmits;
2262         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2263
2264         spin_unlock_bh(&ifp->lock);
2265 out:
2266         read_unlock_bh(&idev->lock);
2267 }
2268
2269 static void addrconf_dad_timer(unsigned long data)
2270 {
2271         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2272         struct inet6_dev *idev = ifp->idev;
2273         struct in6_addr unspec;
2274         struct in6_addr mcaddr;
2275
2276         read_lock_bh(&idev->lock);
2277         if (idev->dead) {
2278                 read_unlock_bh(&idev->lock);
2279                 goto out;
2280         }
2281         spin_lock_bh(&ifp->lock);
2282         if (ifp->probes == 0) {
2283                 /*
2284                  * DAD was successful
2285                  */
2286
2287                 ifp->flags &= ~IFA_F_TENTATIVE;
2288                 spin_unlock_bh(&ifp->lock);
2289                 read_unlock_bh(&idev->lock);
2290
2291                 addrconf_dad_completed(ifp);
2292
2293                 goto out;
2294         }
2295
2296         ifp->probes--;
2297         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2298         spin_unlock_bh(&ifp->lock);
2299         read_unlock_bh(&idev->lock);
2300
2301         /* send a neighbour solicitation for our addr */
2302         memset(&unspec, 0, sizeof(unspec));
2303         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2304         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2305 out:
2306         in6_ifa_put(ifp);
2307 }
2308
2309 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2310 {
2311         struct net_device *     dev = ifp->idev->dev;
2312
2313         /*
2314          *      Configure the address for reception. Now it is valid.
2315          */
2316
2317         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2318
2319         /* If added prefix is link local and forwarding is off,
2320            start sending router solicitations.
2321          */
2322
2323         if (ifp->idev->cnf.forwarding == 0 &&
2324             ifp->idev->cnf.rtr_solicits > 0 &&
2325             (dev->flags&IFF_LOOPBACK) == 0 &&
2326             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2327                 struct in6_addr all_routers;
2328
2329                 ipv6_addr_all_routers(&all_routers);
2330
2331                 /*
2332                  *      If a host as already performed a random delay
2333                  *      [...] as part of DAD [...] there is no need
2334                  *      to delay again before sending the first RS
2335                  */
2336                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2337
2338                 spin_lock_bh(&ifp->lock);
2339                 ifp->probes = 1;
2340                 ifp->idev->if_flags |= IF_RS_SENT;
2341                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2342                 spin_unlock_bh(&ifp->lock);
2343         }
2344 }
2345
2346 #ifdef CONFIG_PROC_FS
2347 struct if6_iter_state {
2348         int bucket;
2349 };
2350
2351 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2352 {
2353         struct inet6_ifaddr *ifa = NULL;
2354         struct if6_iter_state *state = seq->private;
2355
2356         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2357                 ifa = inet6_addr_lst[state->bucket];
2358                 if (ifa)
2359                         break;
2360         }
2361         return ifa;
2362 }
2363
2364 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2365 {
2366         struct if6_iter_state *state = seq->private;
2367
2368         ifa = ifa->lst_next;
2369 try_again:
2370         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2371                 ifa = inet6_addr_lst[state->bucket];
2372                 goto try_again;
2373         }
2374         return ifa;
2375 }
2376
2377 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2378 {
2379         struct inet6_ifaddr *ifa = if6_get_first(seq);
2380
2381         if (ifa)
2382                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2383                         --pos;
2384         return pos ? NULL : ifa;
2385 }
2386
2387 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2388 {
2389         read_lock_bh(&addrconf_hash_lock);
2390         return if6_get_idx(seq, *pos);
2391 }
2392
2393 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2394 {
2395         struct inet6_ifaddr *ifa;
2396
2397         ifa = if6_get_next(seq, v);
2398         ++*pos;
2399         return ifa;
2400 }
2401
2402 static void if6_seq_stop(struct seq_file *seq, void *v)
2403 {
2404         read_unlock_bh(&addrconf_hash_lock);
2405 }
2406
2407 static int if6_seq_show(struct seq_file *seq, void *v)
2408 {
2409         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2410         seq_printf(seq,
2411                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2412                    NIP6(ifp->addr),
2413                    ifp->idev->dev->ifindex,
2414                    ifp->prefix_len,
2415                    ifp->scope,
2416                    ifp->flags,
2417                    ifp->idev->dev->name);
2418         return 0;
2419 }
2420
2421 static struct seq_operations if6_seq_ops = {
2422         .start  = if6_seq_start,
2423         .next   = if6_seq_next,
2424         .show   = if6_seq_show,
2425         .stop   = if6_seq_stop,
2426 };
2427
2428 static int if6_seq_open(struct inode *inode, struct file *file)
2429 {
2430         struct seq_file *seq;
2431         int rc = -ENOMEM;
2432         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2433
2434         if (!s)
2435                 goto out;
2436         memset(s, 0, sizeof(*s));
2437
2438         rc = seq_open(file, &if6_seq_ops);
2439         if (rc)
2440                 goto out_kfree;
2441
2442         seq = file->private_data;
2443         seq->private = s;
2444 out:
2445         return rc;
2446 out_kfree:
2447         kfree(s);
2448         goto out;
2449 }
2450
2451 static struct file_operations if6_fops = {
2452         .owner          = THIS_MODULE,
2453         .open           = if6_seq_open,
2454         .read           = seq_read,
2455         .llseek         = seq_lseek,
2456         .release        = seq_release_private,
2457 };
2458
2459 int __init if6_proc_init(void)
2460 {
2461         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2462                 return -ENOMEM;
2463         return 0;
2464 }
2465
2466 void if6_proc_exit(void)
2467 {
2468         proc_net_remove("if_inet6");
2469 }
2470 #endif  /* CONFIG_PROC_FS */
2471
2472 /*
2473  *      Periodic address status verification
2474  */
2475
2476 static void addrconf_verify(unsigned long foo)
2477 {
2478         struct inet6_ifaddr *ifp;
2479         unsigned long now, next;
2480         int i;
2481
2482         spin_lock_bh(&addrconf_verify_lock);
2483         now = jiffies;
2484         next = now + ADDR_CHECK_FREQUENCY;
2485
2486         del_timer(&addr_chk_timer);
2487
2488         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2489
2490 restart:
2491                 write_lock(&addrconf_hash_lock);
2492                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2493                         unsigned long age;
2494 #ifdef CONFIG_IPV6_PRIVACY
2495                         unsigned long regen_advance;
2496 #endif
2497
2498                         if (ifp->flags & IFA_F_PERMANENT)
2499                                 continue;
2500
2501                         spin_lock(&ifp->lock);
2502                         age = (now - ifp->tstamp) / HZ;
2503
2504 #ifdef CONFIG_IPV6_PRIVACY
2505                         regen_advance = ifp->idev->cnf.regen_max_retry *
2506                                         ifp->idev->cnf.dad_transmits *
2507                                         ifp->idev->nd_parms->retrans_time / HZ;
2508 #endif
2509
2510                         if (age >= ifp->valid_lft) {
2511                                 spin_unlock(&ifp->lock);
2512                                 in6_ifa_hold(ifp);
2513                                 write_unlock(&addrconf_hash_lock);
2514                                 ipv6_del_addr(ifp);
2515                                 goto restart;
2516                         } else if (age >= ifp->prefered_lft) {
2517                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2518                                 int deprecate = 0;
2519
2520                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2521                                         deprecate = 1;
2522                                         ifp->flags |= IFA_F_DEPRECATED;
2523                                 }
2524
2525                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2526                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2527
2528                                 spin_unlock(&ifp->lock);
2529
2530                                 if (deprecate) {
2531                                         in6_ifa_hold(ifp);
2532                                         write_unlock(&addrconf_hash_lock);
2533
2534                                         ipv6_ifa_notify(0, ifp);
2535                                         in6_ifa_put(ifp);
2536                                         goto restart;
2537                                 }
2538 #ifdef CONFIG_IPV6_PRIVACY
2539                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2540                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2541                                 if (age >= ifp->prefered_lft - regen_advance) {
2542                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2543                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2544                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2545                                         if (!ifp->regen_count && ifpub) {
2546                                                 ifp->regen_count++;
2547                                                 in6_ifa_hold(ifp);
2548                                                 in6_ifa_hold(ifpub);
2549                                                 spin_unlock(&ifp->lock);
2550                                                 write_unlock(&addrconf_hash_lock);
2551                                                 ipv6_create_tempaddr(ifpub, ifp);
2552                                                 in6_ifa_put(ifpub);
2553                                                 in6_ifa_put(ifp);
2554                                                 goto restart;
2555                                         }
2556                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2557                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2558                                 spin_unlock(&ifp->lock);
2559 #endif
2560                         } else {
2561                                 /* ifp->prefered_lft <= ifp->valid_lft */
2562                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2563                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2564                                 spin_unlock(&ifp->lock);
2565                         }
2566                 }
2567                 write_unlock(&addrconf_hash_lock);
2568         }
2569
2570         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2571         add_timer(&addr_chk_timer);
2572         spin_unlock_bh(&addrconf_verify_lock);
2573 }
2574
2575 static int
2576 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2577 {
2578         struct rtattr **rta = arg;
2579         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2580         struct in6_addr *pfx;
2581
2582         pfx = NULL;
2583         if (rta[IFA_ADDRESS-1]) {
2584                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2585                         return -EINVAL;
2586                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2587         }
2588         if (rta[IFA_LOCAL-1]) {
2589                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2590                         return -EINVAL;
2591                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2592         }
2593         if (pfx == NULL)
2594                 return -EINVAL;
2595
2596         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2597 }
2598
2599 static int
2600 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2601 {
2602         struct rtattr  **rta = arg;
2603         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2604         struct in6_addr *pfx;
2605
2606         pfx = NULL;
2607         if (rta[IFA_ADDRESS-1]) {
2608                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2609                         return -EINVAL;
2610                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2611         }
2612         if (rta[IFA_LOCAL-1]) {
2613                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2614                         return -EINVAL;
2615                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2616         }
2617         if (pfx == NULL)
2618                 return -EINVAL;
2619
2620         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2621 }
2622
2623 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2624                              u32 pid, u32 seq, int event)
2625 {
2626         struct ifaddrmsg *ifm;
2627         struct nlmsghdr  *nlh;
2628         struct ifa_cacheinfo ci;
2629         unsigned char    *b = skb->tail;
2630
2631         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
2632         if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2633         ifm = NLMSG_DATA(nlh);
2634         ifm->ifa_family = AF_INET6;
2635         ifm->ifa_prefixlen = ifa->prefix_len;
2636         ifm->ifa_flags = ifa->flags;
2637         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2638         if (ifa->scope&IFA_HOST)
2639                 ifm->ifa_scope = RT_SCOPE_HOST;
2640         else if (ifa->scope&IFA_LINK)
2641                 ifm->ifa_scope = RT_SCOPE_LINK;
2642         else if (ifa->scope&IFA_SITE)
2643                 ifm->ifa_scope = RT_SCOPE_SITE;
2644         ifm->ifa_index = ifa->idev->dev->ifindex;
2645         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2646         if (!(ifa->flags&IFA_F_PERMANENT)) {
2647                 ci.ifa_prefered = ifa->prefered_lft;
2648                 ci.ifa_valid = ifa->valid_lft;
2649                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2650                         long tval = (jiffies - ifa->tstamp)/HZ;
2651                         ci.ifa_prefered -= tval;
2652                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2653                                 ci.ifa_valid -= tval;
2654                 }
2655         } else {
2656                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2657                 ci.ifa_valid = INFINITY_LIFE_TIME;
2658         }
2659         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2660                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2661         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2662                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2663         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2664         nlh->nlmsg_len = skb->tail - b;
2665         return skb->len;
2666
2667 nlmsg_failure:
2668 rtattr_failure:
2669         skb_trim(skb, b - skb->data);
2670         return -1;
2671 }
2672
2673 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2674                                 u32 pid, u32 seq, int event)
2675 {
2676         struct ifaddrmsg *ifm;
2677         struct nlmsghdr  *nlh;
2678         struct ifa_cacheinfo ci;
2679         unsigned char    *b = skb->tail;
2680
2681         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
2682         if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
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)
2712 {
2713         struct ifaddrmsg *ifm;
2714         struct nlmsghdr  *nlh;
2715         struct ifa_cacheinfo ci;
2716         unsigned char    *b = skb->tail;
2717
2718         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
2719         if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2720         ifm = NLMSG_DATA(nlh);
2721         ifm->ifa_family = AF_INET6;
2722         ifm->ifa_prefixlen = 128;
2723         ifm->ifa_flags = IFA_F_PERMANENT;
2724         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2725         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2726                 ifm->ifa_scope = RT_SCOPE_SITE;
2727         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2728         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2729         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2730                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2731                     * 100 / HZ);
2732         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2733                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2734                     * 100 / HZ);
2735         ci.ifa_prefered = INFINITY_LIFE_TIME;
2736         ci.ifa_valid = INFINITY_LIFE_TIME;
2737         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2738         nlh->nlmsg_len = skb->tail - b;
2739         return skb->len;
2740
2741 nlmsg_failure:
2742 rtattr_failure:
2743         skb_trim(skb, b - skb->data);
2744         return -1;
2745 }
2746
2747 enum addr_type_t
2748 {
2749         UNICAST_ADDR,
2750         MULTICAST_ADDR,
2751         ANYCAST_ADDR,
2752 };
2753
2754 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2755                            enum addr_type_t type)
2756 {
2757         int idx, ip_idx;
2758         int s_idx, s_ip_idx;
2759         int err = 1;
2760         struct net_device *dev;
2761         struct inet6_dev *idev = NULL;
2762         struct inet6_ifaddr *ifa;
2763         struct ifmcaddr6 *ifmca;
2764         struct ifacaddr6 *ifaca;
2765
2766         s_idx = cb->args[0];
2767         s_ip_idx = ip_idx = cb->args[1];
2768         read_lock(&dev_base_lock);
2769
2770         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2771                 if (idx < s_idx)
2772                         continue;
2773                 if (idx > s_idx)
2774                         s_ip_idx = 0;
2775                 ip_idx = 0;
2776                 if ((idev = in6_dev_get(dev)) == NULL)
2777                         continue;
2778                 read_lock_bh(&idev->lock);
2779                 switch (type) {
2780                 case UNICAST_ADDR:
2781                         /* unicast address */
2782                         for (ifa = idev->addr_list; ifa;
2783                              ifa = ifa->if_next, ip_idx++) {
2784                                 if (ip_idx < s_ip_idx)
2785                                         continue;
2786                                 if ((err = inet6_fill_ifaddr(skb, ifa,
2787                                     NETLINK_CB(cb->skb).pid,
2788                                     cb->nlh->nlmsg_seq, RTM_NEWADDR)) <= 0)
2789                                         goto done;
2790                         }
2791                         /* temp addr */
2792 #ifdef CONFIG_IPV6_PRIVACY
2793                         for (ifa = idev->tempaddr_list; ifa;
2794                              ifa = ifa->tmp_next, ip_idx++) {
2795                                 if (ip_idx < s_ip_idx)
2796                                         continue;
2797                                 if ((err = inet6_fill_ifaddr(skb, ifa,
2798                                     NETLINK_CB(cb->skb).pid,
2799                                     cb->nlh->nlmsg_seq, RTM_NEWADDR)) <= 0)
2800                                         goto done;
2801                         }
2802 #endif
2803                         break;
2804                 case MULTICAST_ADDR:
2805                         /* multicast address */
2806                         for (ifmca = idev->mc_list; ifmca;
2807                              ifmca = ifmca->next, ip_idx++) {
2808                                 if (ip_idx < s_ip_idx)
2809                                         continue;
2810                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2811                                     NETLINK_CB(cb->skb).pid,
2812                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST)) <= 0)
2813                                         goto done;
2814                         }
2815                         break;
2816                 case ANYCAST_ADDR:
2817                         /* anycast address */
2818                         for (ifaca = idev->ac_list; ifaca;
2819                              ifaca = ifaca->aca_next, ip_idx++) {
2820                                 if (ip_idx < s_ip_idx)
2821                                         continue;
2822                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2823                                     NETLINK_CB(cb->skb).pid,
2824                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST)) <= 0)
2825                                         goto done;
2826                         }
2827                         break;
2828                 default:
2829                         break;
2830                 }
2831                 read_unlock_bh(&idev->lock);
2832                 in6_dev_put(idev);
2833         }
2834 done:
2835         if (err <= 0) {
2836                 read_unlock_bh(&idev->lock);
2837                 in6_dev_put(idev);
2838         }
2839         read_unlock(&dev_base_lock);
2840         cb->args[0] = idx;
2841         cb->args[1] = ip_idx;
2842         return skb->len;
2843 }
2844
2845 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2846 {
2847         enum addr_type_t type = UNICAST_ADDR;
2848         return inet6_dump_addr(skb, cb, type);
2849 }
2850
2851 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2852 {
2853         enum addr_type_t type = MULTICAST_ADDR;
2854         return inet6_dump_addr(skb, cb, type);
2855 }
2856
2857
2858 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2859 {
2860         enum addr_type_t type = ANYCAST_ADDR;
2861         return inet6_dump_addr(skb, cb, type);
2862 }
2863
2864 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2865 {
2866         struct sk_buff *skb;
2867         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2868
2869         skb = alloc_skb(size, GFP_ATOMIC);
2870         if (!skb) {
2871                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, ENOBUFS);
2872                 return;
2873         }
2874         if (inet6_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
2875                 kfree_skb(skb);
2876                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, EINVAL);
2877                 return;
2878         }
2879         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFADDR;
2880         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFADDR, GFP_ATOMIC);
2881 }
2882
2883 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
2884                                 __s32 *array, int bytes)
2885 {
2886         memset(array, 0, bytes);
2887         array[DEVCONF_FORWARDING] = cnf->forwarding;
2888         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
2889         array[DEVCONF_MTU6] = cnf->mtu6;
2890         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
2891         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
2892         array[DEVCONF_AUTOCONF] = cnf->autoconf;
2893         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
2894         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
2895         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
2896         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
2897         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
2898 #ifdef CONFIG_IPV6_PRIVACY
2899         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
2900         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
2901         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
2902         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
2903         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
2904 #endif
2905         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
2906 }
2907
2908 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
2909                              u32 pid, u32 seq, int event)
2910 {
2911         struct net_device       *dev = idev->dev;
2912         __s32                   *array = NULL;
2913         struct ifinfomsg        *r;
2914         struct nlmsghdr         *nlh;
2915         unsigned char           *b = skb->tail;
2916         struct rtattr           *subattr;
2917         __u32                   mtu = dev->mtu;
2918         struct ifla_cacheinfo   ci;
2919
2920         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*r));
2921         if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2922         r = NLMSG_DATA(nlh);
2923         r->ifi_family = AF_INET6;
2924         r->ifi_type = dev->type;
2925         r->ifi_index = dev->ifindex;
2926         r->ifi_flags = dev_get_flags(dev);
2927         r->ifi_change = 0;
2928
2929         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
2930
2931         if (dev->addr_len)
2932                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
2933
2934         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
2935         if (dev->ifindex != dev->iflink)
2936                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
2937
2938         subattr = (struct rtattr*)skb->tail;
2939
2940         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
2941
2942         /* return the device flags */
2943         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
2944
2945         /* return interface cacheinfo */
2946         ci.max_reasm_len = IPV6_MAXPLEN;
2947         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
2948                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2949         ci.reachable_time = idev->nd_parms->reachable_time;
2950         ci.retrans_time = idev->nd_parms->retrans_time;
2951         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
2952
2953         /* return the device sysctl params */
2954         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
2955                 goto rtattr_failure;
2956         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
2957         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
2958
2959         /* XXX - Statistics/MC not implemented */
2960         subattr->rta_len = skb->tail - (u8*)subattr;
2961
2962         nlh->nlmsg_len = skb->tail - b;
2963         kfree(array);
2964         return skb->len;
2965
2966 nlmsg_failure:
2967 rtattr_failure:
2968         if (array)
2969                 kfree(array);
2970         skb_trim(skb, b - skb->data);
2971         return -1;
2972 }
2973
2974 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2975 {
2976         int idx, err;
2977         int s_idx = cb->args[0];
2978         struct net_device *dev;
2979         struct inet6_dev *idev;
2980
2981         read_lock(&dev_base_lock);
2982         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
2983                 if (idx < s_idx)
2984                         continue;
2985                 if ((idev = in6_dev_get(dev)) == NULL)
2986                         continue;
2987                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
2988                                 cb->nlh->nlmsg_seq, RTM_NEWLINK);
2989                 in6_dev_put(idev);
2990                 if (err <= 0)
2991                         break;
2992         }
2993         read_unlock(&dev_base_lock);
2994         cb->args[0] = idx;
2995
2996         return skb->len;
2997 }
2998
2999 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3000 {
3001         struct sk_buff *skb;
3002         /* 128 bytes ?? */
3003         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3004
3005         skb = alloc_skb(size, GFP_ATOMIC);
3006         if (!skb) {
3007                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, ENOBUFS);
3008                 return;
3009         }
3010         if (inet6_fill_ifinfo(skb, idev, 0, 0, event) < 0) {
3011                 kfree_skb(skb);
3012                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, EINVAL);
3013                 return;
3014         }
3015         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFINFO;
3016         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFINFO, GFP_ATOMIC);
3017 }
3018
3019 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3020                         struct prefix_info *pinfo, u32 pid, u32 seq, int event)
3021 {
3022         struct prefixmsg        *pmsg;
3023         struct nlmsghdr         *nlh;
3024         unsigned char           *b = skb->tail;
3025         struct prefix_cacheinfo ci;
3026
3027         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*pmsg));
3028
3029         if (pid)
3030                 nlh->nlmsg_flags |= NLM_F_MULTI;
3031
3032         pmsg = NLMSG_DATA(nlh);
3033         pmsg->prefix_family = AF_INET6;
3034         pmsg->prefix_ifindex = idev->dev->ifindex;
3035         pmsg->prefix_len = pinfo->prefix_len;
3036         pmsg->prefix_type = pinfo->type;
3037
3038         pmsg->prefix_flags = 0;
3039         if (pinfo->onlink)
3040                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3041         if (pinfo->autoconf)
3042                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3043
3044         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3045
3046         ci.preferred_time = ntohl(pinfo->prefered);
3047         ci.valid_time = ntohl(pinfo->valid);
3048         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3049
3050         nlh->nlmsg_len = skb->tail - b;
3051         return skb->len;
3052
3053 nlmsg_failure:
3054 rtattr_failure:
3055         skb_trim(skb, b - skb->data);
3056         return -1;
3057 }
3058
3059 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3060                          struct prefix_info *pinfo)
3061 {
3062         struct sk_buff *skb;
3063         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3064
3065         skb = alloc_skb(size, GFP_ATOMIC);
3066         if (!skb) {
3067                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, ENOBUFS);
3068                 return;
3069         }
3070         if (inet6_fill_prefix(skb, idev, pinfo, 0, 0, event) < 0) {
3071                 kfree_skb(skb);
3072                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, EINVAL);
3073                 return;
3074         }
3075         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_PREFIX;
3076         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_PREFIX, GFP_ATOMIC);
3077 }
3078
3079 static struct rtnetlink_link inet6_rtnetlink_table[RTM_MAX - RTM_BASE + 1] = {
3080         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3081         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3082         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3083         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3084         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3085         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3086         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3087         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3088         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3089                                       .dumpit   = inet6_dump_fib, },
3090 };
3091
3092 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3093 {
3094         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3095
3096         switch (event) {
3097         case RTM_NEWADDR:
3098                 dst_hold(&ifp->rt->u.dst);
3099                 if (ip6_ins_rt(ifp->rt, NULL, NULL))
3100                         dst_release(&ifp->rt->u.dst);
3101                 if (ifp->idev->cnf.forwarding)
3102                         addrconf_join_anycast(ifp);
3103                 break;
3104         case RTM_DELADDR:
3105                 if (ifp->idev->cnf.forwarding)
3106                         addrconf_leave_anycast(ifp);
3107                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3108                 dst_hold(&ifp->rt->u.dst);
3109                 if (ip6_del_rt(ifp->rt, NULL, NULL))
3110                         dst_free(&ifp->rt->u.dst);
3111                 else
3112                         dst_release(&ifp->rt->u.dst);
3113                 break;
3114         }
3115 }
3116
3117 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3118 {
3119         read_lock_bh(&addrconf_lock);
3120         if (likely(ifp->idev->dead == 0))
3121                 __ipv6_ifa_notify(event, ifp);
3122         read_unlock_bh(&addrconf_lock);
3123 }
3124
3125 #ifdef CONFIG_SYSCTL
3126
3127 static
3128 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3129                            void __user *buffer, size_t *lenp, loff_t *ppos)
3130 {
3131         int *valp = ctl->data;
3132         int val = *valp;
3133         int ret;
3134
3135         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3136
3137         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3138                 if (valp != &ipv6_devconf.forwarding) {
3139                         if ((!*valp) ^ (!val)) {
3140                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3141                                 if (idev == NULL)
3142                                         return ret;
3143                                 dev_forward_change(idev);
3144                         }
3145                 } else {
3146                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3147                         addrconf_forward_change();
3148                 }
3149                 if (*valp)
3150                         rt6_purge_dflt_routers();
3151         }
3152
3153         return ret;
3154 }
3155
3156 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3157                                             int __user *name, int nlen,
3158                                             void __user *oldval,
3159                                             size_t __user *oldlenp,
3160                                             void __user *newval, size_t newlen,
3161                                             void **context)
3162 {
3163         int *valp = table->data;
3164         int new;
3165
3166         if (!newval || !newlen)
3167                 return 0;
3168         if (newlen != sizeof(int))
3169                 return -EINVAL;
3170         if (get_user(new, (int __user *)newval))
3171                 return -EFAULT;
3172         if (new == *valp)
3173                 return 0;
3174         if (oldval && oldlenp) {
3175                 size_t len;
3176                 if (get_user(len, oldlenp))
3177                         return -EFAULT;
3178                 if (len) {
3179                         if (len > table->maxlen)
3180                                 len = table->maxlen;
3181                         if (copy_to_user(oldval, valp, len))
3182                                 return -EFAULT;
3183                         if (put_user(len, oldlenp))
3184                                 return -EFAULT;
3185                 }
3186         }
3187
3188         if (valp != &ipv6_devconf_dflt.forwarding) {
3189                 if (valp != &ipv6_devconf.forwarding) {
3190                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3191                         int changed;
3192                         if (unlikely(idev == NULL))
3193                                 return -ENODEV;
3194                         changed = (!*valp) ^ (!new);
3195                         *valp = new;
3196                         if (changed)
3197                                 dev_forward_change(idev);
3198                 } else {
3199                         *valp = new;
3200                         addrconf_forward_change();
3201                 }
3202
3203                 if (*valp)
3204                         rt6_purge_dflt_routers();
3205         } else
3206                 *valp = new;
3207
3208         return 1;
3209 }
3210
3211 static struct addrconf_sysctl_table
3212 {
3213         struct ctl_table_header *sysctl_header;
3214         ctl_table addrconf_vars[__NET_IPV6_MAX];
3215         ctl_table addrconf_dev[2];
3216         ctl_table addrconf_conf_dir[2];
3217         ctl_table addrconf_proto_dir[2];
3218         ctl_table addrconf_root_dir[2];
3219 } addrconf_sysctl = {
3220         .sysctl_header = NULL,
3221         .addrconf_vars = {
3222                 {
3223                         .ctl_name       =       NET_IPV6_FORWARDING,
3224                         .procname       =       "forwarding",
3225                         .data           =       &ipv6_devconf.forwarding,
3226                         .maxlen         =       sizeof(int),
3227                         .mode           =       0644,
3228                         .proc_handler   =       &addrconf_sysctl_forward,
3229                         .strategy       =       &addrconf_sysctl_forward_strategy,
3230                 },
3231                 {
3232                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3233                         .procname       =       "hop_limit",
3234                         .data           =       &ipv6_devconf.hop_limit,
3235                         .maxlen         =       sizeof(int),
3236                         .mode           =       0644,
3237                         .proc_handler   =       proc_dointvec,
3238                 },
3239                 {
3240                         .ctl_name       =       NET_IPV6_MTU,
3241                         .procname       =       "mtu",
3242                         .data           =       &ipv6_devconf.mtu6,
3243                         .maxlen         =       sizeof(int),
3244                         .mode           =       0644,
3245                         .proc_handler   =       &proc_dointvec,
3246                 },
3247                 {
3248                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3249                         .procname       =       "accept_ra",
3250                         .data           =       &ipv6_devconf.accept_ra,
3251                         .maxlen         =       sizeof(int),
3252                         .mode           =       0644,
3253                         .proc_handler   =       &proc_dointvec,
3254                 },
3255                 {
3256                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3257                         .procname       =       "accept_redirects",
3258                         .data           =       &ipv6_devconf.accept_redirects,
3259                         .maxlen         =       sizeof(int),
3260                         .mode           =       0644,
3261                         .proc_handler   =       &proc_dointvec,
3262                 },
3263                 {
3264                         .ctl_name       =       NET_IPV6_AUTOCONF,
3265                         .procname       =       "autoconf",
3266                         .data           =       &ipv6_devconf.autoconf,
3267                         .maxlen         =       sizeof(int),
3268                         .mode           =       0644,
3269                         .proc_handler   =       &proc_dointvec,
3270                 },
3271                 {
3272                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3273                         .procname       =       "dad_transmits",
3274                         .data           =       &ipv6_devconf.dad_transmits,
3275                         .maxlen         =       sizeof(int),
3276                         .mode           =       0644,
3277                         .proc_handler   =       &proc_dointvec,
3278                 },
3279                 {
3280                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3281                         .procname       =       "router_solicitations",
3282                         .data           =       &ipv6_devconf.rtr_solicits,
3283                         .maxlen         =       sizeof(int),
3284                         .mode           =       0644,
3285                         .proc_handler   =       &proc_dointvec,
3286                 },
3287                 {
3288                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3289                         .procname       =       "router_solicitation_interval",
3290                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3291                         .maxlen         =       sizeof(int),
3292                         .mode           =       0644,
3293                         .proc_handler   =       &proc_dointvec_jiffies,
3294                         .strategy       =       &sysctl_jiffies,
3295                 },
3296                 {
3297                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3298                         .procname       =       "router_solicitation_delay",
3299                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3300                         .maxlen         =       sizeof(int),
3301                         .mode           =       0644,
3302                         .proc_handler   =       &proc_dointvec_jiffies,
3303                         .strategy       =       &sysctl_jiffies,
3304                 },
3305                 {
3306                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3307                         .procname       =       "force_mld_version",
3308                         .data           =       &ipv6_devconf.force_mld_version,
3309                         .maxlen         =       sizeof(int),
3310                         .mode           =       0644,
3311                         .proc_handler   =       &proc_dointvec,
3312                 },
3313 #ifdef CONFIG_IPV6_PRIVACY
3314                 {
3315                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3316                         .procname       =       "use_tempaddr",
3317                         .data           =       &ipv6_devconf.use_tempaddr,
3318                         .maxlen         =       sizeof(int),
3319                         .mode           =       0644,
3320                         .proc_handler   =       &proc_dointvec,
3321                 },
3322                 {
3323                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3324                         .procname       =       "temp_valid_lft",
3325                         .data           =       &ipv6_devconf.temp_valid_lft,
3326                         .maxlen         =       sizeof(int),
3327                         .mode           =       0644,
3328                         .proc_handler   =       &proc_dointvec,
3329                 },
3330                 {
3331                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3332                         .procname       =       "temp_prefered_lft",
3333                         .data           =       &ipv6_devconf.temp_prefered_lft,
3334                         .maxlen         =       sizeof(int),
3335                         .mode           =       0644,
3336                         .proc_handler   =       &proc_dointvec,
3337                 },
3338                 {
3339                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3340                         .procname       =       "regen_max_retry",
3341                         .data           =       &ipv6_devconf.regen_max_retry,
3342                         .maxlen         =       sizeof(int),
3343                         .mode           =       0644,
3344                         .proc_handler   =       &proc_dointvec,
3345                 },
3346                 {
3347                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3348                         .procname       =       "max_desync_factor",
3349                         .data           =       &ipv6_devconf.max_desync_factor,
3350                         .maxlen         =       sizeof(int),
3351                         .mode           =       0644,
3352                         .proc_handler   =       &proc_dointvec,
3353                 },
3354 #endif
3355                 {
3356                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3357                         .procname       =       "max_addresses",
3358                         .data           =       &ipv6_devconf.max_addresses,
3359                         .maxlen         =       sizeof(int),
3360                         .mode           =       0644,
3361                         .proc_handler   =       &proc_dointvec,
3362                 },
3363                 {
3364                         .ctl_name       =       0,      /* sentinel */
3365                 }
3366         },
3367         .addrconf_dev = {
3368                 {
3369                         .ctl_name       =       NET_PROTO_CONF_ALL,
3370                         .procname       =       "all",
3371                         .mode           =       0555,
3372                         .child          =       addrconf_sysctl.addrconf_vars,
3373                 },
3374                 {
3375                         .ctl_name       =       0,      /* sentinel */
3376                 }
3377         },
3378         .addrconf_conf_dir = {
3379                 {
3380                         .ctl_name       =       NET_IPV6_CONF,
3381                         .procname       =       "conf",
3382                         .mode           =       0555,
3383                         .child          =       addrconf_sysctl.addrconf_dev,
3384                 },
3385                 {
3386                         .ctl_name       =       0,      /* sentinel */
3387                 }
3388         },
3389         .addrconf_proto_dir = {
3390                 {
3391                         .ctl_name       =       NET_IPV6,
3392                         .procname       =       "ipv6",
3393                         .mode           =       0555,
3394                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3395                 },
3396                 {
3397                         .ctl_name       =       0,      /* sentinel */
3398                 }
3399         },
3400         .addrconf_root_dir = {
3401                 {
3402                         .ctl_name       =       CTL_NET,
3403                         .procname       =       "net",
3404                         .mode           =       0555,
3405                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3406                 },
3407                 {
3408                         .ctl_name       =       0,      /* sentinel */
3409                 }
3410         },
3411 };
3412
3413 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3414 {
3415         int i;
3416         struct net_device *dev = idev ? idev->dev : NULL;
3417         struct addrconf_sysctl_table *t;
3418         char *dev_name = NULL;
3419
3420         t = kmalloc(sizeof(*t), GFP_KERNEL);
3421         if (t == NULL)
3422                 return;
3423         memcpy(t, &addrconf_sysctl, sizeof(*t));
3424         for (i=0; t->addrconf_vars[i].data; i++) {
3425                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3426                 t->addrconf_vars[i].de = NULL;
3427                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3428         }
3429         if (dev) {
3430                 dev_name = dev->name;
3431                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3432         } else {
3433                 dev_name = "default";
3434                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3435         }
3436
3437         /*
3438          * Make a copy of dev_name, because '.procname' is regarded as const
3439          * by sysctl and we wouldn't want anyone to change it under our feet
3440          * (see SIOCSIFNAME).
3441          */
3442         dev_name = net_sysctl_strdup(dev_name);
3443         if (!dev_name)
3444             goto free;
3445
3446         t->addrconf_dev[0].procname = dev_name;
3447
3448         t->addrconf_dev[0].child = t->addrconf_vars;
3449         t->addrconf_dev[0].de = NULL;
3450         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3451         t->addrconf_conf_dir[0].de = NULL;
3452         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3453         t->addrconf_proto_dir[0].de = NULL;
3454         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3455         t->addrconf_root_dir[0].de = NULL;
3456
3457         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3458         if (t->sysctl_header == NULL)
3459                 goto free_procname;
3460         else
3461                 p->sysctl = t;
3462         return;
3463
3464         /* error path */
3465  free_procname:
3466         kfree(dev_name);
3467  free:
3468         kfree(t);
3469
3470         return;
3471 }
3472
3473 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3474 {
3475         if (p->sysctl) {
3476                 struct addrconf_sysctl_table *t = p->sysctl;
3477                 p->sysctl = NULL;
3478                 unregister_sysctl_table(t->sysctl_header);
3479                 kfree(t->addrconf_dev[0].procname);
3480                 kfree(t);
3481         }
3482 }
3483
3484
3485 #endif
3486
3487 /*
3488  *      Device notifier
3489  */
3490
3491 int register_inet6addr_notifier(struct notifier_block *nb)
3492 {
3493         return notifier_chain_register(&inet6addr_chain, nb);
3494 }
3495
3496 int unregister_inet6addr_notifier(struct notifier_block *nb)
3497 {
3498         return notifier_chain_unregister(&inet6addr_chain,nb);
3499 }
3500
3501 /*
3502  *      Init / cleanup code
3503  */
3504
3505 int __init addrconf_init(void)
3506 {
3507         int err = 0;
3508
3509         /* The addrconf netdev notifier requires that loopback_dev
3510          * has it's ipv6 private information allocated and setup
3511          * before it can bring up and give link-local addresses
3512          * to other devices which are up.
3513          *
3514          * Unfortunately, loopback_dev is not necessarily the first
3515          * entry in the global dev_base list of net devices.  In fact,
3516          * it is likely to be the very last entry on that list.
3517          * So this causes the notifier registry below to try and
3518          * give link-local addresses to all devices besides loopback_dev
3519          * first, then loopback_dev, which cases all the non-loopback_dev
3520          * devices to fail to get a link-local address.
3521          *
3522          * So, as a temporary fix, allocate the ipv6 structure for
3523          * loopback_dev first by hand.
3524          * Longer term, all of the dependencies ipv6 has upon the loopback
3525          * device and it being up should be removed.
3526          */
3527         rtnl_lock();
3528         if (!ipv6_add_dev(&loopback_dev))
3529                 err = -ENOMEM;
3530         rtnl_unlock();
3531         if (err)
3532                 return err;
3533
3534         register_netdevice_notifier(&ipv6_dev_notf);
3535
3536 #ifdef CONFIG_IPV6_PRIVACY
3537         md5_tfm = crypto_alloc_tfm("md5", 0);
3538         if (unlikely(md5_tfm == NULL))
3539                 printk(KERN_WARNING
3540                         "failed to load transform for md5\n");
3541 #endif
3542
3543         addrconf_verify(0);
3544         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3545 #ifdef CONFIG_SYSCTL
3546         addrconf_sysctl.sysctl_header =
3547                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3548         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3549 #endif
3550
3551         return 0;
3552 }
3553
3554 void __exit addrconf_cleanup(void)
3555 {
3556         struct net_device *dev;
3557         struct inet6_dev *idev;
3558         struct inet6_ifaddr *ifa;
3559         int i;
3560
3561         unregister_netdevice_notifier(&ipv6_dev_notf);
3562
3563         rtnetlink_links[PF_INET6] = NULL;
3564 #ifdef CONFIG_SYSCTL
3565         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3566         addrconf_sysctl_unregister(&ipv6_devconf);
3567 #endif
3568
3569         rtnl_lock();
3570
3571         /*
3572          *      clean dev list.
3573          */
3574
3575         for (dev=dev_base; dev; dev=dev->next) {
3576                 if ((idev = __in6_dev_get(dev)) == NULL)
3577                         continue;
3578                 addrconf_ifdown(dev, 1);
3579         }
3580         addrconf_ifdown(&loopback_dev, 2);
3581
3582         /*
3583          *      Check hash table.
3584          */
3585
3586         write_lock_bh(&addrconf_hash_lock);
3587         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3588                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3589                         struct inet6_ifaddr *bifa;
3590
3591                         bifa = ifa;
3592                         ifa = ifa->lst_next;
3593                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3594                         /* Do not free it; something is wrong.
3595                            Now we can investigate it with debugger.
3596                          */
3597                 }
3598         }
3599         write_unlock_bh(&addrconf_hash_lock);
3600
3601         del_timer(&addr_chk_timer);
3602
3603         rtnl_unlock();
3604
3605 #ifdef CONFIG_IPV6_PRIVACY
3606         if (likely(md5_tfm != NULL)) {
3607                 crypto_free_tfm(md5_tfm);
3608                 md5_tfm = NULL;
3609         }
3610 #endif
3611
3612 #ifdef CONFIG_PROC_FS
3613         proc_net_remove("if_inet6");
3614 #endif
3615 }