net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  */
  39
  40 #include <linux/config.h>
  41 #include <linux/errno.h>
  42 #include <linux/types.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/sched.h>
  46 #include <linux/net.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_arp.h>
  50 #include <linux/if_arcnet.h>
  51 #include <linux/if_infiniband.h>
  52 #include <linux/route.h>
  53 #include <linux/inetdevice.h>
  54 #include <linux/init.h>
  55 #ifdef CONFIG_SYSCTL
  56 #include <linux/sysctl.h>
  57 #endif
  58 #include <linux/delay.h>
  59 #include <linux/notifier.h>
  60 #include <linux/string.h>
  61
  62 #include <net/sock.h>
  63 #include <net/snmp.h>
  64
  65 #include <net/ipv6.h>
  66 #include <net/protocol.h>
  67 #include <net/ndisc.h>
  68 #include <net/ip6_route.h>
  69 #include <net/addrconf.h>
  70 #include <net/tcp.h>
  71 #include <net/ip.h>
  72 #include <linux/if_tunnel.h>
  73 #include <linux/rtnetlink.h>
  74
  75 #ifdef CONFIG_IPV6_PRIVACY
  76 #include <linux/random.h>
  77 #include <linux/crypto.h>
  78 #include <linux/scatterlist.h>
  79 #endif
  80
  81 #include <asm/uaccess.h>
  82
  83 #include <linux/proc_fs.h>
  84 #include <linux/seq_file.h>
  85
  86 /* Set to 3 to get tracing... */
  87 #define ACONF_DEBUG 2
  88
  89 #if ACONF_DEBUG >= 3
  90 #define ADBG(x) printk x
  91 #else
  92 #define ADBG(x)
  93 #endif
  94
  95 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  96 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  97
  98 #ifdef CONFIG_SYSCTL
  99 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 100 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 101 #endif
 102
 103 #ifdef CONFIG_IPV6_PRIVACY
 104 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 105 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 106 static void ipv6_regen_rndid(unsigned long data);
 107
 108 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 109 static struct crypto_tfm *md5_tfm;
 110 static DEFINE_SPINLOCK(md5_tfm_lock);
 111 #endif
 112
 113 static int ipv6_count_addresses(struct inet6_dev *idev);
 114
 115 /*
 116  *      Configured unicast address hash table
 117  */
 118 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 119 static DEFINE_RWLOCK(addrconf_hash_lock);
 120
 121 /* Protects inet6 devices */
 122 DEFINE_RWLOCK(addrconf_lock);
 123
 124 static void addrconf_verify(unsigned long);
 125
 126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 127 static DEFINE_SPINLOCK(addrconf_verify_lock);
 128
 129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 131
 132 static int addrconf_ifdown(struct net_device *dev, int how);
 133
 134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 135 static void addrconf_dad_timer(unsigned long data);
 136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 137 static void addrconf_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_NONE ||
 376                     dev->type == ARPHRD_SIT) {
 377                         printk(KERN_INFO
 378                                 "Disabled Privacy Extensions on device %p(%s)\n",
 379                                 dev, dev->name);
 380                         ndev->cnf.use_tempaddr = -1;
 381                 } else {
 382                         in6_dev_hold(ndev);
 383                         ipv6_regen_rndid((unsigned long) ndev);
 384                 }
 385 #endif
 386
 387                 write_lock_bh(&addrconf_lock);
 388                 dev->ip6_ptr = ndev;
 389                 write_unlock_bh(&addrconf_lock);
 390
 391                 ipv6_mc_init_dev(ndev);
 392                 ndev->tstamp = jiffies;
 393 #ifdef CONFIG_SYSCTL
 394                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 395                                       NET_IPV6_NEIGH, "ipv6",
 396                                       &ndisc_ifinfo_sysctl_change,
 397                                       NULL);
 398                 addrconf_sysctl_register(ndev, &ndev->cnf);
 399 #endif
 400         }
 401         return ndev;
 402 }
 403
 404 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 405 {
 406         struct inet6_dev *idev;
 407
 408         ASSERT_RTNL();
 409
 410         if ((idev = __in6_dev_get(dev)) == NULL) {
 411                 if ((idev = ipv6_add_dev(dev)) == NULL)
 412                         return NULL;
 413         }
 414         if (dev->flags&IFF_UP)
 415                 ipv6_mc_up(idev);
 416         return idev;
 417 }
 418
 419 #ifdef CONFIG_SYSCTL
 420 static void dev_forward_change(struct inet6_dev *idev)
 421 {
 422         struct net_device *dev;
 423         struct inet6_ifaddr *ifa;
 424         struct in6_addr addr;
 425
 426         if (!idev)
 427                 return;
 428         dev = idev->dev;
 429         if (dev && (dev->flags & IFF_MULTICAST)) {
 430                 ipv6_addr_all_routers(&addr);
 431
 432                 if (idev->cnf.forwarding)
 433                         ipv6_dev_mc_inc(dev, &addr);
 434                 else
 435                         ipv6_dev_mc_dec(dev, &addr);
 436         }
 437         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 438                 if (idev->cnf.forwarding)
 439                         addrconf_join_anycast(ifa);
 440                 else
 441                         addrconf_leave_anycast(ifa);
 442         }
 443 }
 444
 445
 446 static void addrconf_forward_change(void)
 447 {
 448         struct net_device *dev;
 449         struct inet6_dev *idev;
 450
 451         read_lock(&dev_base_lock);
 452         for (dev=dev_base; dev; dev=dev->next) {
 453                 read_lock(&addrconf_lock);
 454                 idev = __in6_dev_get(dev);
 455                 if (idev) {
 456                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 457                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 458                         if (changed)
 459                                 dev_forward_change(idev);
 460                 }
 461                 read_unlock(&addrconf_lock);
 462         }
 463         read_unlock(&dev_base_lock);
 464 }
 465 #endif
 466
 467 /* Nobody refers to this ifaddr, destroy it */
 468
 469 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 470 {
 471         BUG_TRAP(ifp->if_next==NULL);
 472         BUG_TRAP(ifp->lst_next==NULL);
 473 #ifdef NET_REFCNT_DEBUG
 474         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 475 #endif
 476
 477         in6_dev_put(ifp->idev);
 478
 479         if (del_timer(&ifp->timer))
 480                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 481
 482         if (!ifp->dead) {
 483                 printk("Freeing alive inet6 address %p\n", ifp);
 484                 return;
 485         }
 486         dst_release(&ifp->rt->u.dst);
 487
 488         kfree(ifp);
 489 }
 490
 491 /* On success it returns ifp with increased reference count */
 492
 493 static struct inet6_ifaddr *
 494 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 495               int scope, u32 flags)
 496 {
 497         struct inet6_ifaddr *ifa = NULL;
 498         struct rt6_info *rt;
 499         int hash;
 500         int err = 0;
 501
 502         read_lock_bh(&addrconf_lock);
 503         if (idev->dead) {
 504                 err = -ENODEV;                  /*XXX*/
 505                 goto out2;
 506         }
 507
 508         write_lock(&addrconf_hash_lock);
 509
 510         /* Ignore adding duplicate addresses on an interface */
 511         if (ipv6_chk_same_addr(addr, idev->dev)) {
 512                 ADBG(("ipv6_add_addr: already assigned\n"));
 513                 err = -EEXIST;
 514                 goto out;
 515         }
 516
 517         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 518
 519         if (ifa == NULL) {
 520                 ADBG(("ipv6_add_addr: malloc failed\n"));
 521                 err = -ENOBUFS;
 522                 goto out;
 523         }
 524
 525         rt = addrconf_dst_alloc(idev, addr, 0);
 526         if (IS_ERR(rt)) {
 527                 err = PTR_ERR(rt);
 528                 goto out;
 529         }
 530
 531         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 532         ipv6_addr_copy(&ifa->addr, addr);
 533
 534         spin_lock_init(&ifa->lock);
 535         init_timer(&ifa->timer);
 536         ifa->timer.data = (unsigned long) ifa;
 537         ifa->scope = scope;
 538         ifa->prefix_len = pfxlen;
 539         ifa->flags = flags | IFA_F_TENTATIVE;
 540         ifa->cstamp = ifa->tstamp = jiffies;
 541
 542         ifa->idev = idev;
 543         in6_dev_hold(idev);
 544         /* For caller */
 545         in6_ifa_hold(ifa);
 546
 547         /* Add to big hash table */
 548         hash = ipv6_addr_hash(addr);
 549
 550         ifa->lst_next = inet6_addr_lst[hash];
 551         inet6_addr_lst[hash] = ifa;
 552         in6_ifa_hold(ifa);
 553         write_unlock(&addrconf_hash_lock);
 554
 555         write_lock(&idev->lock);
 556         /* Add to inet6_dev unicast addr list. */
 557         ifa->if_next = idev->addr_list;
 558         idev->addr_list = ifa;
 559
 560 #ifdef CONFIG_IPV6_PRIVACY
 561         if (ifa->flags&IFA_F_TEMPORARY) {
 562                 ifa->tmp_next = idev->tempaddr_list;
 563                 idev->tempaddr_list = ifa;
 564                 in6_ifa_hold(ifa);
 565         }
 566 #endif
 567
 568         ifa->rt = rt;
 569
 570         in6_ifa_hold(ifa);
 571         write_unlock(&idev->lock);
 572 out2:
 573         read_unlock_bh(&addrconf_lock);
 574
 575         if (likely(err == 0))
 576                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 577         else {
 578                 kfree(ifa);
 579                 ifa = ERR_PTR(err);
 580         }
 581
 582         return ifa;
 583 out:
 584         write_unlock(&addrconf_hash_lock);
 585         goto out2;
 586 }
 587
 588 /* This function wants to get referenced ifp and releases it before return */
 589
 590 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 591 {
 592         struct inet6_ifaddr *ifa, **ifap;
 593         struct inet6_dev *idev = ifp->idev;
 594         int hash;
 595         int deleted = 0, onlink = 0;
 596         unsigned long expires = jiffies;
 597
 598         hash = ipv6_addr_hash(&ifp->addr);
 599
 600         ifp->dead = 1;
 601
 602         write_lock_bh(&addrconf_hash_lock);
 603         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 604              ifap = &ifa->lst_next) {
 605                 if (ifa == ifp) {
 606                         *ifap = ifa->lst_next;
 607                         __in6_ifa_put(ifp);
 608                         ifa->lst_next = NULL;
 609                         break;
 610                 }
 611         }
 612         write_unlock_bh(&addrconf_hash_lock);
 613
 614         write_lock_bh(&idev->lock);
 615 #ifdef CONFIG_IPV6_PRIVACY
 616         if (ifp->flags&IFA_F_TEMPORARY) {
 617                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 618                      ifap = &ifa->tmp_next) {
 619                         if (ifa == ifp) {
 620                                 *ifap = ifa->tmp_next;
 621                                 if (ifp->ifpub) {
 622                                         in6_ifa_put(ifp->ifpub);
 623                                         ifp->ifpub = NULL;
 624                                 }
 625                                 __in6_ifa_put(ifp);
 626                                 ifa->tmp_next = NULL;
 627                                 break;
 628                         }
 629                 }
 630         }
 631 #endif
 632
 633         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
 634              ifap = &ifa->if_next) {
 635                 if (ifa == ifp) {
 636                         *ifap = ifa->if_next;
 637                         __in6_ifa_put(ifp);
 638                         ifa->if_next = NULL;
 639                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 640                                 break;
 641                         deleted = 1;
 642                 } else if (ifp->flags & IFA_F_PERMANENT) {
 643                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 644                                               ifp->prefix_len)) {
 645                                 if (ifa->flags & IFA_F_PERMANENT) {
 646                                         onlink = 1;
 647                                         if (deleted)
 648                                                 break;
 649                                 } else {
 650                                         unsigned long lifetime;
 651
 652                                         if (!onlink)
 653                                                 onlink = -1;
 654
 655                                         spin_lock(&ifa->lock);
 656                                         lifetime = min_t(unsigned long,
 657                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 658                                         if (time_before(expires,
 659                                                         ifa->tstamp + lifetime * HZ))
 660                                                 expires = ifa->tstamp + lifetime * HZ;
 661                                         spin_unlock(&ifa->lock);
 662                                 }
 663                         }
 664                 }
 665         }
 666         write_unlock_bh(&idev->lock);
 667
 668         ipv6_ifa_notify(RTM_DELADDR, ifp);
 669
 670         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 671
 672         addrconf_del_timer(ifp);
 673
 674         /*
 675          * Purge or update corresponding prefix
 676          *
 677          * 1) we don't purge prefix here if address was not permanent.
 678          *    prefix is managed by its own lifetime.
 679          * 2) if there're no addresses, delete prefix.
 680          * 3) if there're still other permanent address(es),
 681          *    corresponding prefix is still permanent.
 682          * 4) otherwise, update prefix lifetime to the
 683          *    longest valid lifetime among the corresponding
 684          *    addresses on the device.
 685          *    Note: subsequent RA will update lifetime.
 686          *
 687          * --yoshfuji
 688          */
 689         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 690                 struct in6_addr prefix;
 691                 struct rt6_info *rt;
 692
 693                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 694                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 695
 696                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 697                         if (onlink == 0) {
 698                                 ip6_del_rt(rt, NULL, NULL, NULL);
 699                                 rt = NULL;
 700                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 701                                 rt->rt6i_expires = expires;
 702                                 rt->rt6i_flags |= RTF_EXPIRES;
 703                         }
 704                 }
 705                 dst_release(&rt->u.dst);
 706         }
 707
 708         in6_ifa_put(ifp);
 709 }
 710
 711 #ifdef CONFIG_IPV6_PRIVACY
 712 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 713 {
 714         struct inet6_dev *idev = ifp->idev;
 715         struct in6_addr addr, *tmpaddr;
 716         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 717         int tmp_plen;
 718         int ret = 0;
 719         int max_addresses;
 720
 721         write_lock(&idev->lock);
 722         if (ift) {
 723                 spin_lock_bh(&ift->lock);
 724                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 725                 spin_unlock_bh(&ift->lock);
 726                 tmpaddr = &addr;
 727         } else {
 728                 tmpaddr = NULL;
 729         }
 730 retry:
 731         in6_dev_hold(idev);
 732         if (idev->cnf.use_tempaddr <= 0) {
 733                 write_unlock(&idev->lock);
 734                 printk(KERN_INFO
 735                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 736                 in6_dev_put(idev);
 737                 ret = -1;
 738                 goto out;
 739         }
 740         spin_lock_bh(&ifp->lock);
 741         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 742                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 743                 spin_unlock_bh(&ifp->lock);
 744                 write_unlock(&idev->lock);
 745                 printk(KERN_WARNING
 746                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 747                 in6_dev_put(idev);
 748                 ret = -1;
 749                 goto out;
 750         }
 751         in6_ifa_hold(ifp);
 752         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 753         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 754                 spin_unlock_bh(&ifp->lock);
 755                 write_unlock(&idev->lock);
 756                 printk(KERN_WARNING
 757                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 758                 in6_ifa_put(ifp);
 759                 in6_dev_put(idev);
 760                 ret = -1;
 761                 goto out;
 762         }
 763         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 764         tmp_valid_lft = min_t(__u32,
 765                               ifp->valid_lft,
 766                               idev->cnf.temp_valid_lft);
 767         tmp_prefered_lft = min_t(__u32,
 768                                  ifp->prefered_lft,
 769                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 770         tmp_plen = ifp->prefix_len;
 771         max_addresses = idev->cnf.max_addresses;
 772         tmp_cstamp = ifp->cstamp;
 773         tmp_tstamp = ifp->tstamp;
 774         spin_unlock_bh(&ifp->lock);
 775
 776         write_unlock(&idev->lock);
 777         ift = !max_addresses ||
 778               ipv6_count_addresses(idev) < max_addresses ?
 779                 ipv6_add_addr(idev, &addr, tmp_plen,
 780                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 781         if (!ift || IS_ERR(ift)) {
 782                 in6_ifa_put(ifp);
 783                 in6_dev_put(idev);
 784                 printk(KERN_INFO
 785                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 786                 tmpaddr = &addr;
 787                 write_lock(&idev->lock);
 788                 goto retry;
 789         }
 790
 791         spin_lock_bh(&ift->lock);
 792         ift->ifpub = ifp;
 793         ift->valid_lft = tmp_valid_lft;
 794         ift->prefered_lft = tmp_prefered_lft;
 795         ift->cstamp = tmp_cstamp;
 796         ift->tstamp = tmp_tstamp;
 797         spin_unlock_bh(&ift->lock);
 798
 799         addrconf_dad_start(ift, 0);
 800         in6_ifa_put(ift);
 801         in6_dev_put(idev);
 802 out:
 803         return ret;
 804 }
 805 #endif
 806
 807 /*
 808  *      Choose an appropriate source address
 809  *      should do:
 810  *      i)      get an address with an appropriate scope
 811  *      ii)     see if there is a specific route for the destination and use
 812  *              an address of the attached interface
 813  *      iii)    don't use deprecated addresses
 814  */
 815 static int inline ipv6_saddr_pref(const struct inet6_ifaddr *ifp, u8 invpref)
 816 {
 817         int pref;
 818         pref = ifp->flags&IFA_F_DEPRECATED ? 0 : 2;
 819 #ifdef CONFIG_IPV6_PRIVACY
 820         pref |= (ifp->flags^invpref)&IFA_F_TEMPORARY ? 0 : 1;
 821 #endif
 822         return pref;
 823 }
 824
 825 #ifdef CONFIG_IPV6_PRIVACY
 826 #define IPV6_GET_SADDR_MAXSCORE(score)  ((score) == 3)
 827 #else
 828 #define IPV6_GET_SADDR_MAXSCORE(score)  (score)
 829 #endif
 830
 831 int ipv6_dev_get_saddr(struct net_device *dev,
 832                        struct in6_addr *daddr, struct in6_addr *saddr)
 833 {
 834         struct inet6_ifaddr *ifp = NULL;
 835         struct inet6_ifaddr *match = NULL;
 836         struct inet6_dev *idev;
 837         int scope;
 838         int err;
 839         int hiscore = -1, score;
 840
 841         scope = ipv6_addr_scope(daddr);
 842
 843         /*
 844          *      known dev
 845          *      search dev and walk through dev addresses
 846          */
 847
 848         if (dev) {
 849                 if (dev->flags & IFF_LOOPBACK)
 850                         scope = IFA_HOST;
 851
 852                 read_lock(&addrconf_lock);
 853                 idev = __in6_dev_get(dev);
 854                 if (idev) {
 855                         read_lock_bh(&idev->lock);
 856                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 857                                 if (ifp->scope == scope) {
 858                                         if (ifp->flags&IFA_F_TENTATIVE)
 859                                                 continue;
 860 #ifdef CONFIG_IPV6_PRIVACY
 861                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
 862 #else
 863                                         score = ipv6_saddr_pref(ifp, 0);
 864 #endif
 865                                         if (score <= hiscore)
 866                                                 continue;
 867
 868                                         if (match)
 869                                                 in6_ifa_put(match);
 870                                         match = ifp;
 871                                         hiscore = score;
 872                                         in6_ifa_hold(ifp);
 873
 874                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
 875                                                 read_unlock_bh(&idev->lock);
 876                                                 read_unlock(&addrconf_lock);
 877                                                 goto out;
 878                                         }
 879                                 }
 880                         }
 881                         read_unlock_bh(&idev->lock);
 882                 }
 883                 read_unlock(&addrconf_lock);
 884         }
 885
 886         if (scope == IFA_LINK)
 887                 goto out;
 888
 889         /*
 890          *      dev == NULL or search failed for specified dev
 891          */
 892
 893         read_lock(&dev_base_lock);
 894         read_lock(&addrconf_lock);
 895         for (dev = dev_base; dev; dev=dev->next) {
 896                 idev = __in6_dev_get(dev);
 897                 if (idev) {
 898                         read_lock_bh(&idev->lock);
 899                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 900                                 if (ifp->scope == scope) {
 901                                         if (ifp->flags&IFA_F_TENTATIVE)
 902                                                 continue;
 903 #ifdef CONFIG_IPV6_PRIVACY
 904                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
 905 #else
 906                                         score = ipv6_saddr_pref(ifp, 0);
 907 #endif
 908                                         if (score <= hiscore)
 909                                                 continue;
 910
 911                                         if (match)
 912                                                 in6_ifa_put(match);
 913                                         match = ifp;
 914                                         hiscore = score;
 915                                         in6_ifa_hold(ifp);
 916
 917                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
 918                                                 read_unlock_bh(&idev->lock);
 919                                                 goto out_unlock_base;
 920                                         }
 921                                 }
 922                         }
 923                         read_unlock_bh(&idev->lock);
 924                 }
 925         }
 926
 927 out_unlock_base:
 928         read_unlock(&addrconf_lock);
 929         read_unlock(&dev_base_lock);
 930
 931 out:
 932         err = -EADDRNOTAVAIL;
 933         if (match) {
 934                 ipv6_addr_copy(saddr, &match->addr);
 935                 err = 0;
 936                 in6_ifa_put(match);
 937         }
 938
 939         return err;
 940 }
 941
 942
 943 int ipv6_get_saddr(struct dst_entry *dst,
 944                    struct in6_addr *daddr, struct in6_addr *saddr)
 945 {
 946         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
 947 }
 948
 949
 950 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
 951 {
 952         struct inet6_dev *idev;
 953         int err = -EADDRNOTAVAIL;
 954
 955         read_lock(&addrconf_lock);
 956         if ((idev = __in6_dev_get(dev)) != NULL) {
 957                 struct inet6_ifaddr *ifp;
 958
 959                 read_lock_bh(&idev->lock);
 960                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 961                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
 962                                 ipv6_addr_copy(addr, &ifp->addr);
 963                                 err = 0;
 964                                 break;
 965                         }
 966                 }
 967                 read_unlock_bh(&idev->lock);
 968         }
 969         read_unlock(&addrconf_lock);
 970         return err;
 971 }
 972
 973 static int ipv6_count_addresses(struct inet6_dev *idev)
 974 {
 975         int cnt = 0;
 976         struct inet6_ifaddr *ifp;
 977
 978         read_lock_bh(&idev->lock);
 979         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
 980                 cnt++;
 981         read_unlock_bh(&idev->lock);
 982         return cnt;
 983 }
 984
 985 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
 986 {
 987         struct inet6_ifaddr * ifp;
 988         u8 hash = ipv6_addr_hash(addr);
 989
 990         read_lock_bh(&addrconf_hash_lock);
 991         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
 992                 if (ipv6_addr_equal(&ifp->addr, addr) &&
 993                     !(ifp->flags&IFA_F_TENTATIVE)) {
 994                         if (dev == NULL || ifp->idev->dev == dev ||
 995                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
 996                                 break;
 997                 }
 998         }
 999         read_unlock_bh(&addrconf_hash_lock);
1000         return ifp != NULL;
1001 }
1002
1003 static
1004 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1005 {
1006         struct inet6_ifaddr * ifp;
1007         u8 hash = ipv6_addr_hash(addr);
1008
1009         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1010                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1011                         if (dev == NULL || ifp->idev->dev == dev)
1012                                 break;
1013                 }
1014         }
1015         return ifp != NULL;
1016 }
1017
1018 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1019 {
1020         struct inet6_ifaddr * ifp;
1021         u8 hash = ipv6_addr_hash(addr);
1022
1023         read_lock_bh(&addrconf_hash_lock);
1024         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1025                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1026                         if (dev == NULL || ifp->idev->dev == dev ||
1027                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1028                                 in6_ifa_hold(ifp);
1029                                 break;
1030                         }
1031                 }
1032         }
1033         read_unlock_bh(&addrconf_hash_lock);
1034
1035         return ifp;
1036 }
1037
1038 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1039 {
1040         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1041         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1042         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1043         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1044         int sk_ipv6only = ipv6_only_sock(sk);
1045         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1046         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1047         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1048
1049         if (!sk2_rcv_saddr && !sk_ipv6only)
1050                 return 1;
1051
1052         if (addr_type2 == IPV6_ADDR_ANY &&
1053             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1054                 return 1;
1055
1056         if (addr_type == IPV6_ADDR_ANY &&
1057             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1058                 return 1;
1059
1060         if (sk2_rcv_saddr6 &&
1061             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1062                 return 1;
1063
1064         if (addr_type == IPV6_ADDR_MAPPED &&
1065             !sk2_ipv6only &&
1066             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1067                 return 1;
1068
1069         return 0;
1070 }
1071
1072 /* Gets referenced address, destroys ifaddr */
1073
1074 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1075 {
1076         if (net_ratelimit())
1077                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1078         if (ifp->flags&IFA_F_PERMANENT) {
1079                 spin_lock_bh(&ifp->lock);
1080                 addrconf_del_timer(ifp);
1081                 ifp->flags |= IFA_F_TENTATIVE;
1082                 spin_unlock_bh(&ifp->lock);
1083                 in6_ifa_put(ifp);
1084 #ifdef CONFIG_IPV6_PRIVACY
1085         } else if (ifp->flags&IFA_F_TEMPORARY) {
1086                 struct inet6_ifaddr *ifpub;
1087                 spin_lock_bh(&ifp->lock);
1088                 ifpub = ifp->ifpub;
1089                 if (ifpub) {
1090                         in6_ifa_hold(ifpub);
1091                         spin_unlock_bh(&ifp->lock);
1092                         ipv6_create_tempaddr(ifpub, ifp);
1093                         in6_ifa_put(ifpub);
1094                 } else {
1095                         spin_unlock_bh(&ifp->lock);
1096                 }
1097                 ipv6_del_addr(ifp);
1098 #endif
1099         } else
1100                 ipv6_del_addr(ifp);
1101 }
1102
1103
1104 /* Join to solicited addr multicast group. */
1105
1106 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1107 {
1108         struct in6_addr maddr;
1109
1110         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1111                 return;
1112
1113         addrconf_addr_solict_mult(addr, &maddr);
1114         ipv6_dev_mc_inc(dev, &maddr);
1115 }
1116
1117 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1118 {
1119         struct in6_addr maddr;
1120
1121         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1122                 return;
1123
1124         addrconf_addr_solict_mult(addr, &maddr);
1125         __ipv6_dev_mc_dec(idev, &maddr);
1126 }
1127
1128 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1129 {
1130         struct in6_addr addr;
1131         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1132         if (ipv6_addr_any(&addr))
1133                 return;
1134         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1135 }
1136
1137 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1138 {
1139         struct in6_addr addr;
1140         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1141         if (ipv6_addr_any(&addr))
1142                 return;
1143         __ipv6_dev_ac_dec(ifp->idev, &addr);
1144 }
1145
1146 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1147 {
1148         switch (dev->type) {
1149         case ARPHRD_ETHER:
1150         case ARPHRD_FDDI:
1151         case ARPHRD_IEEE802_TR:
1152                 if (dev->addr_len != ETH_ALEN)
1153                         return -1;
1154                 memcpy(eui, dev->dev_addr, 3);
1155                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1156
1157                 /*
1158                  * The zSeries OSA network cards can be shared among various
1159                  * OS instances, but the OSA cards have only one MAC address.
1160                  * This leads to duplicate address conflicts in conjunction
1161                  * with IPv6 if more than one instance uses the same card.
1162                  *
1163                  * The driver for these cards can deliver a unique 16-bit
1164                  * identifier for each instance sharing the same card.  It is
1165                  * placed instead of 0xFFFE in the interface identifier.  The
1166                  * "u" bit of the interface identifier is not inverted in this
1167                  * case.  Hence the resulting interface identifier has local
1168                  * scope according to RFC2373.
1169                  */
1170                 if (dev->dev_id) {
1171                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1172                         eui[4] = dev->dev_id & 0xFF;
1173                 } else {
1174                         eui[3] = 0xFF;
1175                         eui[4] = 0xFE;
1176                         eui[0] ^= 2;
1177                 }
1178                 return 0;
1179         case ARPHRD_ARCNET:
1180                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1181                 if (dev->addr_len != ARCNET_ALEN)
1182                         return -1;
1183                 memset(eui, 0, 7);
1184                 eui[7] = *(u8*)dev->dev_addr;
1185                 return 0;
1186         case ARPHRD_INFINIBAND:
1187                 if (dev->addr_len != INFINIBAND_ALEN)
1188                         return -1;
1189                 memcpy(eui, dev->dev_addr + 12, 8);
1190                 eui[0] |= 2;
1191                 return 0;
1192         }
1193         return -1;
1194 }
1195
1196 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1197 {
1198         int err = -1;
1199         struct inet6_ifaddr *ifp;
1200
1201         read_lock_bh(&idev->lock);
1202         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1203                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1204                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1205                         err = 0;
1206                         break;
1207                 }
1208         }
1209         read_unlock_bh(&idev->lock);
1210         return err;
1211 }
1212
1213 #ifdef CONFIG_IPV6_PRIVACY
1214 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1215 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1216 {
1217         struct net_device *dev;
1218         struct scatterlist sg[2];
1219
1220         sg_set_buf(&sg[0], idev->entropy, 8);
1221         sg_set_buf(&sg[1], idev->work_eui64, 8);
1222
1223         dev = idev->dev;
1224
1225         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1226                 printk(KERN_INFO
1227                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1228                         idev);
1229                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1230         }
1231 regen:
1232         spin_lock(&md5_tfm_lock);
1233         if (unlikely(md5_tfm == NULL)) {
1234                 spin_unlock(&md5_tfm_lock);
1235                 return -1;
1236         }
1237         crypto_digest_init(md5_tfm);
1238         crypto_digest_update(md5_tfm, sg, 2);
1239         crypto_digest_final(md5_tfm, idev->work_digest);
1240         spin_unlock(&md5_tfm_lock);
1241
1242         memcpy(idev->rndid, &idev->work_digest[0], 8);
1243         idev->rndid[0] &= ~0x02;
1244         memcpy(idev->entropy, &idev->work_digest[8], 8);
1245
1246         /*
1247          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1248          * check if generated address is not inappropriate
1249          *
1250          *  - Reserved subnet anycast (RFC 2526)
1251          *      11111101 11....11 1xxxxxxx
1252          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1253          *      00-00-5E-FE-xx-xx-xx-xx
1254          *  - value 0
1255          *  - XXX: already assigned to an address on the device
1256          */
1257         if (idev->rndid[0] == 0xfd &&
1258             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1259             (idev->rndid[7]&0x80))
1260                 goto regen;
1261         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1262                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1263                         goto regen;
1264                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1265                         goto regen;
1266         }
1267
1268         return 0;
1269 }
1270
1271 static void ipv6_regen_rndid(unsigned long data)
1272 {
1273         struct inet6_dev *idev = (struct inet6_dev *) data;
1274         unsigned long expires;
1275
1276         read_lock_bh(&addrconf_lock);
1277         write_lock_bh(&idev->lock);
1278
1279         if (idev->dead)
1280                 goto out;
1281
1282         if (__ipv6_regen_rndid(idev) < 0)
1283                 goto out;
1284
1285         expires = jiffies +
1286                 idev->cnf.temp_prefered_lft * HZ -
1287                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1288         if (time_before(expires, jiffies)) {
1289                 printk(KERN_WARNING
1290                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1291                         idev->dev->name);
1292                 goto out;
1293         }
1294
1295         if (!mod_timer(&idev->regen_timer, expires))
1296                 in6_dev_hold(idev);
1297
1298 out:
1299         write_unlock_bh(&idev->lock);
1300         read_unlock_bh(&addrconf_lock);
1301         in6_dev_put(idev);
1302 }
1303
1304 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1305         int ret = 0;
1306
1307         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1308                 ret = __ipv6_regen_rndid(idev);
1309         return ret;
1310 }
1311 #endif
1312
1313 /*
1314  *      Add prefix route.
1315  */
1316
1317 static void
1318 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1319                       unsigned long expires, u32 flags)
1320 {
1321         struct in6_rtmsg rtmsg;
1322
1323         memset(&rtmsg, 0, sizeof(rtmsg));
1324         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1325         rtmsg.rtmsg_dst_len = plen;
1326         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1327         rtmsg.rtmsg_ifindex = dev->ifindex;
1328         rtmsg.rtmsg_info = expires;
1329         rtmsg.rtmsg_flags = RTF_UP|flags;
1330         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1331
1332         /* Prevent useless cloning on PtP SIT.
1333            This thing is done here expecting that the whole
1334            class of non-broadcast devices need not cloning.
1335          */
1336         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1337                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1338
1339         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1340 }
1341
1342 /* Create "default" multicast route to the interface */
1343
1344 static void addrconf_add_mroute(struct net_device *dev)
1345 {
1346         struct in6_rtmsg rtmsg;
1347
1348         memset(&rtmsg, 0, sizeof(rtmsg));
1349         ipv6_addr_set(&rtmsg.rtmsg_dst,
1350                       htonl(0xFF000000), 0, 0, 0);
1351         rtmsg.rtmsg_dst_len = 8;
1352         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1353         rtmsg.rtmsg_ifindex = dev->ifindex;
1354         rtmsg.rtmsg_flags = RTF_UP;
1355         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1356         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1357 }
1358
1359 static void sit_route_add(struct net_device *dev)
1360 {
1361         struct in6_rtmsg rtmsg;
1362
1363         memset(&rtmsg, 0, sizeof(rtmsg));
1364
1365         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1366         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1367
1368         /* prefix length - 96 bits "::d.d.d.d" */
1369         rtmsg.rtmsg_dst_len     = 96;
1370         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1371         rtmsg.rtmsg_ifindex     = dev->ifindex;
1372
1373         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1374 }
1375
1376 static void addrconf_add_lroute(struct net_device *dev)
1377 {
1378         struct in6_addr addr;
1379
1380         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1381         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1382 }
1383
1384 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1385 {
1386         struct inet6_dev *idev;
1387
1388         ASSERT_RTNL();
1389
1390         if ((idev = ipv6_find_idev(dev)) == NULL)
1391                 return NULL;
1392
1393         /* Add default multicast route */
1394         addrconf_add_mroute(dev);
1395
1396         /* Add link local route */
1397         addrconf_add_lroute(dev);
1398         return idev;
1399 }
1400
1401 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1402 {
1403         struct prefix_info *pinfo;
1404         __u32 valid_lft;
1405         __u32 prefered_lft;
1406         int addr_type;
1407         unsigned long rt_expires;
1408         struct inet6_dev *in6_dev;
1409
1410         pinfo = (struct prefix_info *) opt;
1411
1412         if (len < sizeof(struct prefix_info)) {
1413                 ADBG(("addrconf: prefix option too short\n"));
1414                 return;
1415         }
1416
1417         /*
1418          *      Validation checks ([ADDRCONF], page 19)
1419          */
1420
1421         addr_type = ipv6_addr_type(&pinfo->prefix);
1422
1423         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1424                 return;
1425
1426         valid_lft = ntohl(pinfo->valid);
1427         prefered_lft = ntohl(pinfo->prefered);
1428
1429         if (prefered_lft > valid_lft) {
1430                 if (net_ratelimit())
1431                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1432                 return;
1433         }
1434
1435         in6_dev = in6_dev_get(dev);
1436
1437         if (in6_dev == NULL) {
1438                 if (net_ratelimit())
1439                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1440                 return;
1441         }
1442
1443         /*
1444          *      Two things going on here:
1445          *      1) Add routes for on-link prefixes
1446          *      2) Configure prefixes with the auto flag set
1447          */
1448
1449         /* Avoid arithmetic overflow. Really, we could
1450            save rt_expires in seconds, likely valid_lft,
1451            but it would require division in fib gc, that it
1452            not good.
1453          */
1454         if (valid_lft >= 0x7FFFFFFF/HZ)
1455                 rt_expires = 0;
1456         else
1457                 rt_expires = jiffies + valid_lft * HZ;
1458
1459         if (pinfo->onlink) {
1460                 struct rt6_info *rt;
1461                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1462
1463                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1464                         if (rt->rt6i_flags&RTF_EXPIRES) {
1465                                 if (valid_lft == 0) {
1466                                         ip6_del_rt(rt, NULL, NULL, NULL);
1467                                         rt = NULL;
1468                                 } else {
1469                                         rt->rt6i_expires = rt_expires;
1470                                 }
1471                         }
1472                 } else if (valid_lft) {
1473                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1474                                               dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1475                 }
1476                 if (rt)
1477                         dst_release(&rt->u.dst);
1478         }
1479
1480         /* Try to figure out our local address for this prefix */
1481
1482         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1483                 struct inet6_ifaddr * ifp;
1484                 struct in6_addr addr;
1485                 int create = 0, update_lft = 0;
1486
1487                 if (pinfo->prefix_len == 64) {
1488                         memcpy(&addr, &pinfo->prefix, 8);
1489                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1490                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1491                                 in6_dev_put(in6_dev);
1492                                 return;
1493                         }
1494                         goto ok;
1495                 }
1496                 if (net_ratelimit())
1497                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1498                                pinfo->prefix_len);
1499                 in6_dev_put(in6_dev);
1500                 return;
1501
1502 ok:
1503
1504                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1505
1506                 if (ifp == NULL && valid_lft) {
1507                         int max_addresses = in6_dev->cnf.max_addresses;
1508
1509                         /* Do not allow to create too much of autoconfigured
1510                          * addresses; this would be too easy way to crash kernel.
1511                          */
1512                         if (!max_addresses ||
1513                             ipv6_count_addresses(in6_dev) < max_addresses)
1514                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1515                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1516
1517                         if (!ifp || IS_ERR(ifp)) {
1518                                 in6_dev_put(in6_dev);
1519                                 return;
1520                         }
1521
1522                         update_lft = create = 1;
1523                         ifp->cstamp = jiffies;
1524                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1525                 }
1526
1527                 if (ifp) {
1528                         int flags;
1529                         unsigned long now;
1530 #ifdef CONFIG_IPV6_PRIVACY
1531                         struct inet6_ifaddr *ift;
1532 #endif
1533                         u32 stored_lft;
1534
1535                         /* update lifetime (RFC2462 5.5.3 e) */
1536                         spin_lock(&ifp->lock);
1537                         now = jiffies;
1538                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1539                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1540                         else
1541                                 stored_lft = 0;
1542                         if (!update_lft && stored_lft) {
1543                                 if (valid_lft > MIN_VALID_LIFETIME ||
1544                                     valid_lft > stored_lft)
1545                                         update_lft = 1;
1546                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1547                                         /* valid_lft <= stored_lft is always true */
1548                                         /* XXX: IPsec */
1549                                         update_lft = 0;
1550                                 } else {
1551                                         valid_lft = MIN_VALID_LIFETIME;
1552                                         if (valid_lft < prefered_lft)
1553                                                 prefered_lft = valid_lft;
1554                                         update_lft = 1;
1555                                 }
1556                         }
1557
1558                         if (update_lft) {
1559                                 ifp->valid_lft = valid_lft;
1560                                 ifp->prefered_lft = prefered_lft;
1561                                 ifp->tstamp = now;
1562                                 flags = ifp->flags;
1563                                 ifp->flags &= ~IFA_F_DEPRECATED;
1564                                 spin_unlock(&ifp->lock);
1565
1566                                 if (!(flags&IFA_F_TENTATIVE))
1567                                         ipv6_ifa_notify(0, ifp);
1568                         } else
1569                                 spin_unlock(&ifp->lock);
1570
1571 #ifdef CONFIG_IPV6_PRIVACY
1572                         read_lock_bh(&in6_dev->lock);
1573                         /* update all temporary addresses in the list */
1574                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1575                                 /*
1576                                  * When adjusting the lifetimes of an existing
1577                                  * temporary address, only lower the lifetimes.
1578                                  * Implementations must not increase the
1579                                  * lifetimes of an existing temporary address
1580                                  * when processing a Prefix Information Option.
1581                                  */
1582                                 spin_lock(&ift->lock);
1583                                 flags = ift->flags;
1584                                 if (ift->valid_lft > valid_lft &&
1585                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1586                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1587                                 if (ift->prefered_lft > prefered_lft &&
1588                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1589                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1590                                 spin_unlock(&ift->lock);
1591                                 if (!(flags&IFA_F_TENTATIVE))
1592                                         ipv6_ifa_notify(0, ift);
1593                         }
1594
1595                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1596                                 /*
1597                                  * When a new public address is created as described in [ADDRCONF],
1598                                  * also create a new temporary address.
1599                                  */
1600                                 read_unlock_bh(&in6_dev->lock);
1601                                 ipv6_create_tempaddr(ifp, NULL);
1602                         } else {
1603                                 read_unlock_bh(&in6_dev->lock);
1604                         }
1605 #endif
1606                         in6_ifa_put(ifp);
1607                         addrconf_verify(0);
1608                 }
1609         }
1610         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1611         in6_dev_put(in6_dev);
1612 }
1613
1614 /*
1615  *      Set destination address.
1616  *      Special case for SIT interfaces where we create a new "virtual"
1617  *      device.
1618  */
1619 int addrconf_set_dstaddr(void __user *arg)
1620 {
1621         struct in6_ifreq ireq;
1622         struct net_device *dev;
1623         int err = -EINVAL;
1624
1625         rtnl_lock();
1626
1627         err = -EFAULT;
1628         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1629                 goto err_exit;
1630
1631         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1632
1633         err = -ENODEV;
1634         if (dev == NULL)
1635                 goto err_exit;
1636
1637         if (dev->type == ARPHRD_SIT) {
1638                 struct ifreq ifr;
1639                 mm_segment_t    oldfs;
1640                 struct ip_tunnel_parm p;
1641
1642                 err = -EADDRNOTAVAIL;
1643                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1644                         goto err_exit;
1645
1646                 memset(&p, 0, sizeof(p));
1647                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1648                 p.iph.saddr = 0;
1649                 p.iph.version = 4;
1650                 p.iph.ihl = 5;
1651                 p.iph.protocol = IPPROTO_IPV6;
1652                 p.iph.ttl = 64;
1653                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1654
1655                 oldfs = get_fs(); set_fs(KERNEL_DS);
1656                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1657                 set_fs(oldfs);
1658
1659                 if (err == 0) {
1660                         err = -ENOBUFS;
1661                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1662                                 goto err_exit;
1663                         err = dev_open(dev);
1664                 }
1665         }
1666
1667 err_exit:
1668         rtnl_unlock();
1669         return err;
1670 }
1671
1672 /*
1673  *      Manual configuration of address on an interface
1674  */
1675 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1676 {
1677         struct inet6_ifaddr *ifp;
1678         struct inet6_dev *idev;
1679         struct net_device *dev;
1680         int scope;
1681
1682         ASSERT_RTNL();
1683
1684         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1685                 return -ENODEV;
1686
1687         if (!(dev->flags&IFF_UP))
1688                 return -ENETDOWN;
1689
1690         if ((idev = addrconf_add_dev(dev)) == NULL)
1691                 return -ENOBUFS;
1692
1693         scope = ipv6_addr_scope(pfx);
1694
1695         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1696         if (!IS_ERR(ifp)) {
1697                 addrconf_dad_start(ifp, 0);
1698                 in6_ifa_put(ifp);
1699                 return 0;
1700         }
1701
1702         return PTR_ERR(ifp);
1703 }
1704
1705 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1706 {
1707         struct inet6_ifaddr *ifp;
1708         struct inet6_dev *idev;
1709         struct net_device *dev;
1710
1711         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1712                 return -ENODEV;
1713
1714         if ((idev = __in6_dev_get(dev)) == NULL)
1715                 return -ENXIO;
1716
1717         read_lock_bh(&idev->lock);
1718         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1719                 if (ifp->prefix_len == plen &&
1720                     ipv6_addr_equal(pfx, &ifp->addr)) {
1721                         in6_ifa_hold(ifp);
1722                         read_unlock_bh(&idev->lock);
1723
1724                         ipv6_del_addr(ifp);
1725
1726                         /* If the last address is deleted administratively,
1727                            disable IPv6 on this interface.
1728                          */
1729                         if (idev->addr_list == NULL)
1730                                 addrconf_ifdown(idev->dev, 1);
1731                         return 0;
1732                 }
1733         }
1734         read_unlock_bh(&idev->lock);
1735         return -EADDRNOTAVAIL;
1736 }
1737
1738
1739 int addrconf_add_ifaddr(void __user *arg)
1740 {
1741         struct in6_ifreq ireq;
1742         int err;
1743
1744         if (!capable(CAP_NET_ADMIN))
1745                 return -EPERM;
1746
1747         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1748                 return -EFAULT;
1749
1750         rtnl_lock();
1751         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1752         rtnl_unlock();
1753         return err;
1754 }
1755
1756 int addrconf_del_ifaddr(void __user *arg)
1757 {
1758         struct in6_ifreq ireq;
1759         int err;
1760
1761         if (!capable(CAP_NET_ADMIN))
1762                 return -EPERM;
1763
1764         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1765                 return -EFAULT;
1766
1767         rtnl_lock();
1768         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1769         rtnl_unlock();
1770         return err;
1771 }
1772
1773 static void sit_add_v4_addrs(struct inet6_dev *idev)
1774 {
1775         struct inet6_ifaddr * ifp;
1776         struct in6_addr addr;
1777         struct net_device *dev;
1778         int scope;
1779
1780         ASSERT_RTNL();
1781
1782         memset(&addr, 0, sizeof(struct in6_addr));
1783         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1784
1785         if (idev->dev->flags&IFF_POINTOPOINT) {
1786                 addr.s6_addr32[0] = htonl(0xfe800000);
1787                 scope = IFA_LINK;
1788         } else {
1789                 scope = IPV6_ADDR_COMPATv4;
1790         }
1791
1792         if (addr.s6_addr32[3]) {
1793                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1794                 if (!IS_ERR(ifp)) {
1795                         spin_lock_bh(&ifp->lock);
1796                         ifp->flags &= ~IFA_F_TENTATIVE;
1797                         spin_unlock_bh(&ifp->lock);
1798                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1799                         in6_ifa_put(ifp);
1800                 }
1801                 return;
1802         }
1803
1804         for (dev = dev_base; dev != NULL; dev = dev->next) {
1805                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1806                 if (in_dev && (dev->flags & IFF_UP)) {
1807                         struct in_ifaddr * ifa;
1808
1809                         int flag = scope;
1810
1811                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1812                                 int plen;
1813
1814                                 addr.s6_addr32[3] = ifa->ifa_local;
1815
1816                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1817                                         continue;
1818                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1819                                         if (idev->dev->flags&IFF_POINTOPOINT)
1820                                                 continue;
1821                                         flag |= IFA_HOST;
1822                                 }
1823                                 if (idev->dev->flags&IFF_POINTOPOINT)
1824                                         plen = 64;
1825                                 else
1826                                         plen = 96;
1827
1828                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1829                                                     IFA_F_PERMANENT);
1830                                 if (!IS_ERR(ifp)) {
1831                                         spin_lock_bh(&ifp->lock);
1832                                         ifp->flags &= ~IFA_F_TENTATIVE;
1833                                         spin_unlock_bh(&ifp->lock);
1834                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1835                                         in6_ifa_put(ifp);
1836                                 }
1837                         }
1838                 }
1839         }
1840 }
1841
1842 static void init_loopback(struct net_device *dev)
1843 {
1844         struct inet6_dev  *idev;
1845         struct inet6_ifaddr * ifp;
1846
1847         /* ::1 */
1848
1849         ASSERT_RTNL();
1850
1851         if ((idev = ipv6_find_idev(dev)) == NULL) {
1852                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1853                 return;
1854         }
1855
1856         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1857         if (!IS_ERR(ifp)) {
1858                 spin_lock_bh(&ifp->lock);
1859                 ifp->flags &= ~IFA_F_TENTATIVE;
1860                 spin_unlock_bh(&ifp->lock);
1861                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1862                 in6_ifa_put(ifp);
1863         }
1864 }
1865
1866 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
1867 {
1868         struct inet6_ifaddr * ifp;
1869
1870         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
1871         if (!IS_ERR(ifp)) {
1872                 addrconf_dad_start(ifp, 0);
1873                 in6_ifa_put(ifp);
1874         }
1875 }
1876
1877 static void addrconf_dev_config(struct net_device *dev)
1878 {
1879         struct in6_addr addr;
1880         struct inet6_dev    * idev;
1881
1882         ASSERT_RTNL();
1883
1884         if ((dev->type != ARPHRD_ETHER) &&
1885             (dev->type != ARPHRD_FDDI) &&
1886             (dev->type != ARPHRD_IEEE802_TR) &&
1887             (dev->type != ARPHRD_ARCNET) &&
1888             (dev->type != ARPHRD_INFINIBAND)) {
1889                 /* Alas, we support only Ethernet autoconfiguration. */
1890                 return;
1891         }
1892
1893         idev = addrconf_add_dev(dev);
1894         if (idev == NULL)
1895                 return;
1896
1897         memset(&addr, 0, sizeof(struct in6_addr));
1898         addr.s6_addr32[0] = htonl(0xFE800000);
1899
1900         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
1901                 addrconf_add_linklocal(idev, &addr);
1902 }
1903
1904 static void addrconf_sit_config(struct net_device *dev)
1905 {
1906         struct inet6_dev *idev;
1907
1908         ASSERT_RTNL();
1909
1910         /*
1911          * Configure the tunnel with one of our IPv4
1912          * addresses... we should configure all of
1913          * our v4 addrs in the tunnel
1914          */
1915
1916         if ((idev = ipv6_find_idev(dev)) == NULL) {
1917                 printk(KERN_DEBUG "init sit: add_dev failed\n");
1918                 return;
1919         }
1920
1921         sit_add_v4_addrs(idev);
1922
1923         if (dev->flags&IFF_POINTOPOINT) {
1924                 addrconf_add_mroute(dev);
1925                 addrconf_add_lroute(dev);
1926         } else
1927                 sit_route_add(dev);
1928 }
1929
1930 static inline int
1931 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
1932 {
1933         struct in6_addr lladdr;
1934
1935         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
1936                 addrconf_add_linklocal(idev, &lladdr);
1937                 return 0;
1938         }
1939         return -1;
1940 }
1941
1942 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
1943 {
1944         struct net_device *link_dev;
1945
1946         /* first try to inherit the link-local address from the link device */
1947         if (idev->dev->iflink &&
1948             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
1949                 if (!ipv6_inherit_linklocal(idev, link_dev))
1950                         return;
1951         }
1952         /* then try to inherit it from any device */
1953         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
1954                 if (!ipv6_inherit_linklocal(idev, link_dev))
1955                         return;
1956         }
1957         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
1958 }
1959
1960 /*
1961  * Autoconfigure tunnel with a link-local address so routing protocols,
1962  * DHCPv6, MLD etc. can be run over the virtual link
1963  */
1964
1965 static void addrconf_ip6_tnl_config(struct net_device *dev)
1966 {
1967         struct inet6_dev *idev;
1968
1969         ASSERT_RTNL();
1970
1971         if ((idev = addrconf_add_dev(dev)) == NULL) {
1972                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
1973                 return;
1974         }
1975         ip6_tnl_add_linklocal(idev);
1976         addrconf_add_mroute(dev);
1977 }
1978
1979 static int addrconf_notify(struct notifier_block *this, unsigned long event,
1980                            void * data)
1981 {
1982         struct net_device *dev = (struct net_device *) data;
1983         struct inet6_dev *idev = __in6_dev_get(dev);
1984
1985         switch(event) {
1986         case NETDEV_UP:
1987                 switch(dev->type) {
1988                 case ARPHRD_SIT:
1989                         addrconf_sit_config(dev);
1990                         break;
1991                 case ARPHRD_TUNNEL6:
1992                         addrconf_ip6_tnl_config(dev);
1993                         break;
1994                 case ARPHRD_LOOPBACK:
1995                         init_loopback(dev);
1996                         break;
1997
1998                 default:
1999                         addrconf_dev_config(dev);
2000                         break;
2001                 };
2002                 if (idev) {
2003                         /* If the MTU changed during the interface down, when the
2004                            interface up, the changed MTU must be reflected in the
2005                            idev as well as routers.
2006                          */
2007                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2008                                 rt6_mtu_change(dev, dev->mtu);
2009                                 idev->cnf.mtu6 = dev->mtu;
2010                         }
2011                         idev->tstamp = jiffies;
2012                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2013                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2014                            stop IPv6 on this interface.
2015                          */
2016                         if (dev->mtu < IPV6_MIN_MTU)
2017                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2018                 }
2019                 break;
2020
2021         case NETDEV_CHANGEMTU:
2022                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2023                         rt6_mtu_change(dev, dev->mtu);
2024                         idev->cnf.mtu6 = dev->mtu;
2025                         break;
2026                 }
2027
2028                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2029
2030         case NETDEV_DOWN:
2031         case NETDEV_UNREGISTER:
2032                 /*
2033                  *      Remove all addresses from this interface.
2034                  */
2035                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2036                 break;
2037         case NETDEV_CHANGE:
2038                 break;
2039         case NETDEV_CHANGENAME:
2040 #ifdef CONFIG_SYSCTL
2041                 if (idev) {
2042                         addrconf_sysctl_unregister(&idev->cnf);
2043                         neigh_sysctl_unregister(idev->nd_parms);
2044                         neigh_sysctl_register(dev, idev->nd_parms,
2045                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2046                                               &ndisc_ifinfo_sysctl_change,
2047                                               NULL);
2048                         addrconf_sysctl_register(idev, &idev->cnf);
2049                 }
2050 #endif
2051                 break;
2052         };
2053
2054         return NOTIFY_OK;
2055 }
2056
2057 /*
2058  *      addrconf module should be notified of a device going up
2059  */
2060 static struct notifier_block ipv6_dev_notf = {
2061         .notifier_call = addrconf_notify,
2062         .priority = 0
2063 };
2064
2065 static int addrconf_ifdown(struct net_device *dev, int how)
2066 {
2067         struct inet6_dev *idev;
2068         struct inet6_ifaddr *ifa, **bifa;
2069         int i;
2070
2071         ASSERT_RTNL();
2072
2073         if (dev == &loopback_dev && how == 1)
2074                 how = 0;
2075
2076         rt6_ifdown(dev);
2077         neigh_ifdown(&nd_tbl, dev);
2078
2079         idev = __in6_dev_get(dev);
2080         if (idev == NULL)
2081                 return -ENODEV;
2082
2083         /* Step 1: remove reference to ipv6 device from parent device.
2084                    Do not dev_put!
2085          */
2086         if (how == 1) {
2087                 write_lock_bh(&addrconf_lock);
2088                 dev->ip6_ptr = NULL;
2089                 idev->dead = 1;
2090                 write_unlock_bh(&addrconf_lock);
2091
2092                 /* Step 1.5: remove snmp6 entry */
2093                 snmp6_unregister_dev(idev);
2094
2095         }
2096
2097         /* Step 2: clear hash table */
2098         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2099                 bifa = &inet6_addr_lst[i];
2100
2101                 write_lock_bh(&addrconf_hash_lock);
2102                 while ((ifa = *bifa) != NULL) {
2103                         if (ifa->idev == idev) {
2104                                 *bifa = ifa->lst_next;
2105                                 ifa->lst_next = NULL;
2106                                 addrconf_del_timer(ifa);
2107                                 in6_ifa_put(ifa);
2108                                 continue;
2109                         }
2110                         bifa = &ifa->lst_next;
2111                 }
2112                 write_unlock_bh(&addrconf_hash_lock);
2113         }
2114
2115         write_lock_bh(&idev->lock);
2116
2117         /* Step 3: clear flags for stateless addrconf */
2118         if (how != 1)
2119                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2120
2121         /* Step 4: clear address list */
2122 #ifdef CONFIG_IPV6_PRIVACY
2123         if (how == 1 && del_timer(&idev->regen_timer))
2124                 in6_dev_put(idev);
2125
2126         /* clear tempaddr list */
2127         while ((ifa = idev->tempaddr_list) != NULL) {
2128                 idev->tempaddr_list = ifa->tmp_next;
2129                 ifa->tmp_next = NULL;
2130                 ifa->dead = 1;
2131                 write_unlock_bh(&idev->lock);
2132                 spin_lock_bh(&ifa->lock);
2133
2134                 if (ifa->ifpub) {
2135                         in6_ifa_put(ifa->ifpub);
2136                         ifa->ifpub = NULL;
2137                 }
2138                 spin_unlock_bh(&ifa->lock);
2139                 in6_ifa_put(ifa);
2140                 write_lock_bh(&idev->lock);
2141         }
2142 #endif
2143         while ((ifa = idev->addr_list) != NULL) {
2144                 idev->addr_list = ifa->if_next;
2145                 ifa->if_next = NULL;
2146                 ifa->dead = 1;
2147                 addrconf_del_timer(ifa);
2148                 write_unlock_bh(&idev->lock);
2149
2150                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2151                 in6_ifa_put(ifa);
2152
2153                 write_lock_bh(&idev->lock);
2154         }
2155         write_unlock_bh(&idev->lock);
2156
2157         /* Step 5: Discard multicast list */
2158
2159         if (how == 1)
2160                 ipv6_mc_destroy_dev(idev);
2161         else
2162                 ipv6_mc_down(idev);
2163
2164         /* Step 5: netlink notification of this interface */
2165         idev->tstamp = jiffies;
2166         inet6_ifinfo_notify(RTM_DELLINK, idev);
2167
2168         /* Shot the device (if unregistered) */
2169
2170         if (how == 1) {
2171 #ifdef CONFIG_SYSCTL
2172                 addrconf_sysctl_unregister(&idev->cnf);
2173                 neigh_sysctl_unregister(idev->nd_parms);
2174 #endif
2175                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2176                 neigh_ifdown(&nd_tbl, dev);
2177                 in6_dev_put(idev);
2178         }
2179         return 0;
2180 }
2181
2182 static void addrconf_rs_timer(unsigned long data)
2183 {
2184         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2185
2186         if (ifp->idev->cnf.forwarding)
2187                 goto out;
2188
2189         if (ifp->idev->if_flags & IF_RA_RCVD) {
2190                 /*
2191                  *      Announcement received after solicitation
2192                  *      was sent
2193                  */
2194                 goto out;
2195         }
2196
2197         spin_lock(&ifp->lock);
2198         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2199                 struct in6_addr all_routers;
2200
2201                 /* The wait after the last probe can be shorter */
2202                 addrconf_mod_timer(ifp, AC_RS,
2203                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2204                                    ifp->idev->cnf.rtr_solicit_delay :
2205                                    ifp->idev->cnf.rtr_solicit_interval);
2206                 spin_unlock(&ifp->lock);
2207
2208                 ipv6_addr_all_routers(&all_routers);
2209
2210                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2211         } else {
2212                 spin_unlock(&ifp->lock);
2213                 /*
2214                  * Note: we do not support deprecated "all on-link"
2215                  * assumption any longer.
2216                  */
2217                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2218                        ifp->idev->dev->name);
2219         }
2220
2221 out:
2222         in6_ifa_put(ifp);
2223 }
2224
2225 /*
2226  *      Duplicate Address Detection
2227  */
2228 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2229 {
2230         struct inet6_dev *idev = ifp->idev;
2231         struct net_device *dev = idev->dev;
2232         unsigned long rand_num;
2233
2234         addrconf_join_solict(dev, &ifp->addr);
2235
2236         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2237                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2238                                         flags);
2239
2240         net_srandom(ifp->addr.s6_addr32[3]);
2241         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2242
2243         read_lock_bh(&idev->lock);
2244         if (ifp->dead)
2245                 goto out;
2246         spin_lock_bh(&ifp->lock);
2247
2248         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2249             !(ifp->flags&IFA_F_TENTATIVE)) {
2250                 ifp->flags &= ~IFA_F_TENTATIVE;
2251                 spin_unlock_bh(&ifp->lock);
2252                 read_unlock_bh(&idev->lock);
2253
2254                 addrconf_dad_completed(ifp);
2255                 return;
2256         }
2257
2258         ifp->probes = idev->cnf.dad_transmits;
2259         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2260
2261         spin_unlock_bh(&ifp->lock);
2262 out:
2263         read_unlock_bh(&idev->lock);
2264 }
2265
2266 static void addrconf_dad_timer(unsigned long data)
2267 {
2268         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2269         struct inet6_dev *idev = ifp->idev;
2270         struct in6_addr unspec;
2271         struct in6_addr mcaddr;
2272
2273         read_lock_bh(&idev->lock);
2274         if (idev->dead) {
2275                 read_unlock_bh(&idev->lock);
2276                 goto out;
2277         }
2278         spin_lock_bh(&ifp->lock);
2279         if (ifp->probes == 0) {
2280                 /*
2281                  * DAD was successful
2282                  */
2283
2284                 ifp->flags &= ~IFA_F_TENTATIVE;
2285                 spin_unlock_bh(&ifp->lock);
2286                 read_unlock_bh(&idev->lock);
2287
2288                 addrconf_dad_completed(ifp);
2289
2290                 goto out;
2291         }
2292
2293         ifp->probes--;
2294         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2295         spin_unlock_bh(&ifp->lock);
2296         read_unlock_bh(&idev->lock);
2297
2298         /* send a neighbour solicitation for our addr */
2299         memset(&unspec, 0, sizeof(unspec));
2300         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2301         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2302 out:
2303         in6_ifa_put(ifp);
2304 }
2305
2306 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2307 {
2308         struct net_device *     dev = ifp->idev->dev;
2309
2310         /*
2311          *      Configure the address for reception. Now it is valid.
2312          */
2313
2314         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2315
2316         /* If added prefix is link local and forwarding is off,
2317            start sending router solicitations.
2318          */
2319
2320         if (ifp->idev->cnf.forwarding == 0 &&
2321             ifp->idev->cnf.rtr_solicits > 0 &&
2322             (dev->flags&IFF_LOOPBACK) == 0 &&
2323             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2324                 struct in6_addr all_routers;
2325
2326                 ipv6_addr_all_routers(&all_routers);
2327
2328                 /*
2329                  *      If a host as already performed a random delay
2330                  *      [...] as part of DAD [...] there is no need
2331                  *      to delay again before sending the first RS
2332                  */
2333                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2334
2335                 spin_lock_bh(&ifp->lock);
2336                 ifp->probes = 1;
2337                 ifp->idev->if_flags |= IF_RS_SENT;
2338                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2339                 spin_unlock_bh(&ifp->lock);
2340         }
2341 }
2342
2343 #ifdef CONFIG_PROC_FS
2344 struct if6_iter_state {
2345         int bucket;
2346 };
2347
2348 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2349 {
2350         struct inet6_ifaddr *ifa = NULL;
2351         struct if6_iter_state *state = seq->private;
2352
2353         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2354                 ifa = inet6_addr_lst[state->bucket];
2355                 if (ifa)
2356                         break;
2357         }
2358         return ifa;
2359 }
2360
2361 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2362 {
2363         struct if6_iter_state *state = seq->private;
2364
2365         ifa = ifa->lst_next;
2366 try_again:
2367         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2368                 ifa = inet6_addr_lst[state->bucket];
2369                 goto try_again;
2370         }
2371         return ifa;
2372 }
2373
2374 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2375 {
2376         struct inet6_ifaddr *ifa = if6_get_first(seq);
2377
2378         if (ifa)
2379                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2380                         --pos;
2381         return pos ? NULL : ifa;
2382 }
2383
2384 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2385 {
2386         read_lock_bh(&addrconf_hash_lock);
2387         return if6_get_idx(seq, *pos);
2388 }
2389
2390 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2391 {
2392         struct inet6_ifaddr *ifa;
2393
2394         ifa = if6_get_next(seq, v);
2395         ++*pos;
2396         return ifa;
2397 }
2398
2399 static void if6_seq_stop(struct seq_file *seq, void *v)
2400 {
2401         read_unlock_bh(&addrconf_hash_lock);
2402 }
2403
2404 static int if6_seq_show(struct seq_file *seq, void *v)
2405 {
2406         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2407         seq_printf(seq,
2408                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2409                    NIP6(ifp->addr),
2410                    ifp->idev->dev->ifindex,
2411                    ifp->prefix_len,
2412                    ifp->scope,
2413                    ifp->flags,
2414                    ifp->idev->dev->name);
2415         return 0;
2416 }
2417
2418 static struct seq_operations if6_seq_ops = {
2419         .start  = if6_seq_start,
2420         .next   = if6_seq_next,
2421         .show   = if6_seq_show,
2422         .stop   = if6_seq_stop,
2423 };
2424
2425 static int if6_seq_open(struct inode *inode, struct file *file)
2426 {
2427         struct seq_file *seq;
2428         int rc = -ENOMEM;
2429         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2430
2431         if (!s)
2432                 goto out;
2433         memset(s, 0, sizeof(*s));
2434
2435         rc = seq_open(file, &if6_seq_ops);
2436         if (rc)
2437                 goto out_kfree;
2438
2439         seq = file->private_data;
2440         seq->private = s;
2441 out:
2442         return rc;
2443 out_kfree:
2444         kfree(s);
2445         goto out;
2446 }
2447
2448 static struct file_operations if6_fops = {
2449         .owner          = THIS_MODULE,
2450         .open           = if6_seq_open,
2451         .read           = seq_read,
2452         .llseek         = seq_lseek,
2453         .release        = seq_release_private,
2454 };
2455
2456 int __init if6_proc_init(void)
2457 {
2458         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2459                 return -ENOMEM;
2460         return 0;
2461 }
2462
2463 void if6_proc_exit(void)
2464 {
2465         proc_net_remove("if_inet6");
2466 }
2467 #endif  /* CONFIG_PROC_FS */
2468
2469 /*
2470  *      Periodic address status verification
2471  */
2472
2473 static void addrconf_verify(unsigned long foo)
2474 {
2475         struct inet6_ifaddr *ifp;
2476         unsigned long now, next;
2477         int i;
2478
2479         spin_lock_bh(&addrconf_verify_lock);
2480         now = jiffies;
2481         next = now + ADDR_CHECK_FREQUENCY;
2482
2483         del_timer(&addr_chk_timer);
2484
2485         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2486
2487 restart:
2488                 write_lock(&addrconf_hash_lock);
2489                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2490                         unsigned long age;
2491 #ifdef CONFIG_IPV6_PRIVACY
2492                         unsigned long regen_advance;
2493 #endif
2494
2495                         if (ifp->flags & IFA_F_PERMANENT)
2496                                 continue;
2497
2498                         spin_lock(&ifp->lock);
2499                         age = (now - ifp->tstamp) / HZ;
2500
2501 #ifdef CONFIG_IPV6_PRIVACY
2502                         regen_advance = ifp->idev->cnf.regen_max_retry *
2503                                         ifp->idev->cnf.dad_transmits *
2504                                         ifp->idev->nd_parms->retrans_time / HZ;
2505 #endif
2506
2507                         if (age >= ifp->valid_lft) {
2508                                 spin_unlock(&ifp->lock);
2509                                 in6_ifa_hold(ifp);
2510                                 write_unlock(&addrconf_hash_lock);
2511                                 ipv6_del_addr(ifp);
2512                                 goto restart;
2513                         } else if (age >= ifp->prefered_lft) {
2514                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2515                                 int deprecate = 0;
2516
2517                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2518                                         deprecate = 1;
2519                                         ifp->flags |= IFA_F_DEPRECATED;
2520                                 }
2521
2522                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2523                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2524
2525                                 spin_unlock(&ifp->lock);
2526
2527                                 if (deprecate) {
2528                                         in6_ifa_hold(ifp);
2529                                         write_unlock(&addrconf_hash_lock);
2530
2531                                         ipv6_ifa_notify(0, ifp);
2532                                         in6_ifa_put(ifp);
2533                                         goto restart;
2534                                 }
2535 #ifdef CONFIG_IPV6_PRIVACY
2536                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2537                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2538                                 if (age >= ifp->prefered_lft - regen_advance) {
2539                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2540                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2541                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2542                                         if (!ifp->regen_count && ifpub) {
2543                                                 ifp->regen_count++;
2544                                                 in6_ifa_hold(ifp);
2545                                                 in6_ifa_hold(ifpub);
2546                                                 spin_unlock(&ifp->lock);
2547                                                 write_unlock(&addrconf_hash_lock);
2548                                                 ipv6_create_tempaddr(ifpub, ifp);
2549                                                 in6_ifa_put(ifpub);
2550                                                 in6_ifa_put(ifp);
2551                                                 goto restart;
2552                                         }
2553                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2554                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2555                                 spin_unlock(&ifp->lock);
2556 #endif
2557                         } else {
2558                                 /* ifp->prefered_lft <= ifp->valid_lft */
2559                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2560                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2561                                 spin_unlock(&ifp->lock);
2562                         }
2563                 }
2564                 write_unlock(&addrconf_hash_lock);
2565         }
2566
2567         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2568         add_timer(&addr_chk_timer);
2569         spin_unlock_bh(&addrconf_verify_lock);
2570 }
2571
2572 static int
2573 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2574 {
2575         struct rtattr **rta = arg;
2576         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2577         struct in6_addr *pfx;
2578
2579         pfx = NULL;
2580         if (rta[IFA_ADDRESS-1]) {
2581                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2582                         return -EINVAL;
2583                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2584         }
2585         if (rta[IFA_LOCAL-1]) {
2586                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2587                         return -EINVAL;
2588                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2589         }
2590         if (pfx == NULL)
2591                 return -EINVAL;
2592
2593         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2594 }
2595
2596 static int
2597 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2598 {
2599         struct rtattr  **rta = arg;
2600         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2601         struct in6_addr *pfx;
2602
2603         pfx = NULL;
2604         if (rta[IFA_ADDRESS-1]) {
2605                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2606                         return -EINVAL;
2607                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2608         }
2609         if (rta[IFA_LOCAL-1]) {
2610                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2611                         return -EINVAL;
2612                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2613         }
2614         if (pfx == NULL)
2615                 return -EINVAL;
2616
2617         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2618 }
2619
2620 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2621                              u32 pid, u32 seq, int event, unsigned int flags)
2622 {
2623         struct ifaddrmsg *ifm;
2624         struct nlmsghdr  *nlh;
2625         struct ifa_cacheinfo ci;
2626         unsigned char    *b = skb->tail;
2627
2628         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2629         ifm = NLMSG_DATA(nlh);
2630         ifm->ifa_family = AF_INET6;
2631         ifm->ifa_prefixlen = ifa->prefix_len;
2632         ifm->ifa_flags = ifa->flags;
2633         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2634         if (ifa->scope&IFA_HOST)
2635                 ifm->ifa_scope = RT_SCOPE_HOST;
2636         else if (ifa->scope&IFA_LINK)
2637                 ifm->ifa_scope = RT_SCOPE_LINK;
2638         else if (ifa->scope&IFA_SITE)
2639                 ifm->ifa_scope = RT_SCOPE_SITE;
2640         ifm->ifa_index = ifa->idev->dev->ifindex;
2641         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2642         if (!(ifa->flags&IFA_F_PERMANENT)) {
2643                 ci.ifa_prefered = ifa->prefered_lft;
2644                 ci.ifa_valid = ifa->valid_lft;
2645                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2646                         long tval = (jiffies - ifa->tstamp)/HZ;
2647                         ci.ifa_prefered -= tval;
2648                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2649                                 ci.ifa_valid -= tval;
2650                 }
2651         } else {
2652                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2653                 ci.ifa_valid = INFINITY_LIFE_TIME;
2654         }
2655         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2656                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2657         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2658                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2659         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2660         nlh->nlmsg_len = skb->tail - b;
2661         return skb->len;
2662
2663 nlmsg_failure:
2664 rtattr_failure:
2665         skb_trim(skb, b - skb->data);
2666         return -1;
2667 }
2668
2669 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2670                                 u32 pid, u32 seq, int event, u16 flags)
2671 {
2672         struct ifaddrmsg *ifm;
2673         struct nlmsghdr  *nlh;
2674         struct ifa_cacheinfo ci;
2675         unsigned char    *b = skb->tail;
2676
2677         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2678         ifm = NLMSG_DATA(nlh);
2679         ifm->ifa_family = AF_INET6;
2680         ifm->ifa_prefixlen = 128;
2681         ifm->ifa_flags = IFA_F_PERMANENT;
2682         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2683         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2684                 ifm->ifa_scope = RT_SCOPE_SITE;
2685         ifm->ifa_index = ifmca->idev->dev->ifindex;
2686         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2687         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2688                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2689                     * 100 / HZ);
2690         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2691                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2692                     * 100 / HZ);
2693         ci.ifa_prefered = INFINITY_LIFE_TIME;
2694         ci.ifa_valid = INFINITY_LIFE_TIME;
2695         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2696         nlh->nlmsg_len = skb->tail - b;
2697         return skb->len;
2698
2699 nlmsg_failure:
2700 rtattr_failure:
2701         skb_trim(skb, b - skb->data);
2702         return -1;
2703 }
2704
2705 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2706                                 u32 pid, u32 seq, int event, unsigned int flags)
2707 {
2708         struct ifaddrmsg *ifm;
2709         struct nlmsghdr  *nlh;
2710         struct ifa_cacheinfo ci;
2711         unsigned char    *b = skb->tail;
2712
2713         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2714         ifm = NLMSG_DATA(nlh);
2715         ifm->ifa_family = AF_INET6;
2716         ifm->ifa_prefixlen = 128;
2717         ifm->ifa_flags = IFA_F_PERMANENT;
2718         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2719         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2720                 ifm->ifa_scope = RT_SCOPE_SITE;
2721         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2722         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2723         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2724                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2725                     * 100 / HZ);
2726         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2727                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2728                     * 100 / HZ);
2729         ci.ifa_prefered = INFINITY_LIFE_TIME;
2730         ci.ifa_valid = INFINITY_LIFE_TIME;
2731         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2732         nlh->nlmsg_len = skb->tail - b;
2733         return skb->len;
2734
2735 nlmsg_failure:
2736 rtattr_failure:
2737         skb_trim(skb, b - skb->data);
2738         return -1;
2739 }
2740
2741 enum addr_type_t
2742 {
2743         UNICAST_ADDR,
2744         MULTICAST_ADDR,
2745         ANYCAST_ADDR,
2746 };
2747
2748 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2749                            enum addr_type_t type)
2750 {
2751         int idx, ip_idx;
2752         int s_idx, s_ip_idx;
2753         int err = 1;
2754         struct net_device *dev;
2755         struct inet6_dev *idev = NULL;
2756         struct inet6_ifaddr *ifa;
2757         struct ifmcaddr6 *ifmca;
2758         struct ifacaddr6 *ifaca;
2759
2760         s_idx = cb->args[0];
2761         s_ip_idx = ip_idx = cb->args[1];
2762         read_lock(&dev_base_lock);
2763
2764         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2765                 if (idx < s_idx)
2766                         continue;
2767                 if (idx > s_idx)
2768                         s_ip_idx = 0;
2769                 ip_idx = 0;
2770                 if ((idev = in6_dev_get(dev)) == NULL)
2771                         continue;
2772                 read_lock_bh(&idev->lock);
2773                 switch (type) {
2774                 case UNICAST_ADDR:
2775                         /* unicast address incl. temp addr */
2776                         for (ifa = idev->addr_list; ifa;
2777                              ifa = ifa->if_next, ip_idx++) {
2778                                 if (ip_idx < s_ip_idx)
2779                                         continue;
2780                                 if ((err = inet6_fill_ifaddr(skb, ifa,
2781                                     NETLINK_CB(cb->skb).pid,
2782                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
2783                                     NLM_F_MULTI)) <= 0)
2784                                         goto done;
2785                         }
2786                         break;
2787                 case MULTICAST_ADDR:
2788                         /* multicast address */
2789                         for (ifmca = idev->mc_list; ifmca;
2790                              ifmca = ifmca->next, ip_idx++) {
2791                                 if (ip_idx < s_ip_idx)
2792                                         continue;
2793                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2794                                     NETLINK_CB(cb->skb).pid,
2795                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2796                                     NLM_F_MULTI)) <= 0)
2797                                         goto done;
2798                         }
2799                         break;
2800                 case ANYCAST_ADDR:
2801                         /* anycast address */
2802                         for (ifaca = idev->ac_list; ifaca;
2803                              ifaca = ifaca->aca_next, ip_idx++) {
2804                                 if (ip_idx < s_ip_idx)
2805                                         continue;
2806                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2807                                     NETLINK_CB(cb->skb).pid,
2808                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2809                                     NLM_F_MULTI)) <= 0)
2810                                         goto done;
2811                         }
2812                         break;
2813                 default:
2814                         break;
2815                 }
2816                 read_unlock_bh(&idev->lock);
2817                 in6_dev_put(idev);
2818         }
2819 done:
2820         if (err <= 0) {
2821                 read_unlock_bh(&idev->lock);
2822                 in6_dev_put(idev);
2823         }
2824         read_unlock(&dev_base_lock);
2825         cb->args[0] = idx;
2826         cb->args[1] = ip_idx;
2827         return skb->len;
2828 }
2829
2830 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2831 {
2832         enum addr_type_t type = UNICAST_ADDR;
2833         return inet6_dump_addr(skb, cb, type);
2834 }
2835
2836 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2837 {
2838         enum addr_type_t type = MULTICAST_ADDR;
2839         return inet6_dump_addr(skb, cb, type);
2840 }
2841
2842
2843 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2844 {
2845         enum addr_type_t type = ANYCAST_ADDR;
2846         return inet6_dump_addr(skb, cb, type);
2847 }
2848
2849 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2850 {
2851         struct sk_buff *skb;
2852         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2853
2854         skb = alloc_skb(size, GFP_ATOMIC);
2855         if (!skb) {
2856                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
2857                 return;
2858         }
2859         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
2860                 kfree_skb(skb);
2861                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
2862                 return;
2863         }
2864         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
2865         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
2866 }
2867
2868 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
2869                                 __s32 *array, int bytes)
2870 {
2871         memset(array, 0, bytes);
2872         array[DEVCONF_FORWARDING] = cnf->forwarding;
2873         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
2874         array[DEVCONF_MTU6] = cnf->mtu6;
2875         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
2876         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
2877         array[DEVCONF_AUTOCONF] = cnf->autoconf;
2878         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
2879         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
2880         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
2881         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
2882         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
2883 #ifdef CONFIG_IPV6_PRIVACY
2884         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
2885         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
2886         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
2887         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
2888         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
2889 #endif
2890         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
2891 }
2892
2893 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
2894                              u32 pid, u32 seq, int event, unsigned int flags)
2895 {
2896         struct net_device       *dev = idev->dev;
2897         __s32                   *array = NULL;
2898         struct ifinfomsg        *r;
2899         struct nlmsghdr         *nlh;
2900         unsigned char           *b = skb->tail;
2901         struct rtattr           *subattr;
2902         __u32                   mtu = dev->mtu;
2903         struct ifla_cacheinfo   ci;
2904
2905         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
2906         r = NLMSG_DATA(nlh);
2907         r->ifi_family = AF_INET6;
2908         r->__ifi_pad = 0;
2909         r->ifi_type = dev->type;
2910         r->ifi_index = dev->ifindex;
2911         r->ifi_flags = dev_get_flags(dev);
2912         r->ifi_change = 0;
2913
2914         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
2915
2916         if (dev->addr_len)
2917                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
2918
2919         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
2920         if (dev->ifindex != dev->iflink)
2921                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
2922
2923         subattr = (struct rtattr*)skb->tail;
2924
2925         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
2926
2927         /* return the device flags */
2928         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
2929
2930         /* return interface cacheinfo */
2931         ci.max_reasm_len = IPV6_MAXPLEN;
2932         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
2933                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2934         ci.reachable_time = idev->nd_parms->reachable_time;
2935         ci.retrans_time = idev->nd_parms->retrans_time;
2936         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
2937
2938         /* return the device sysctl params */
2939         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
2940                 goto rtattr_failure;
2941         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
2942         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
2943
2944         /* XXX - Statistics/MC not implemented */
2945         subattr->rta_len = skb->tail - (u8*)subattr;
2946
2947         nlh->nlmsg_len = skb->tail - b;
2948         kfree(array);
2949         return skb->len;
2950
2951 nlmsg_failure:
2952 rtattr_failure:
2953         if (array)
2954                 kfree(array);
2955         skb_trim(skb, b - skb->data);
2956         return -1;
2957 }
2958
2959 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2960 {
2961         int idx, err;
2962         int s_idx = cb->args[0];
2963         struct net_device *dev;
2964         struct inet6_dev *idev;
2965
2966         read_lock(&dev_base_lock);
2967         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
2968                 if (idx < s_idx)
2969                         continue;
2970                 if ((idev = in6_dev_get(dev)) == NULL)
2971                         continue;
2972                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
2973                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
2974                 in6_dev_put(idev);
2975                 if (err <= 0)
2976                         break;
2977         }
2978         read_unlock(&dev_base_lock);
2979         cb->args[0] = idx;
2980
2981         return skb->len;
2982 }
2983
2984 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
2985 {
2986         struct sk_buff *skb;
2987         /* 128 bytes ?? */
2988         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
2989
2990         skb = alloc_skb(size, GFP_ATOMIC);
2991         if (!skb) {
2992                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
2993                 return;
2994         }
2995         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
2996                 kfree_skb(skb);
2997                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
2998                 return;
2999         }
3000         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3001         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3002 }
3003
3004 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3005                         struct prefix_info *pinfo, u32 pid, u32 seq,
3006                         int event, unsigned int flags)
3007 {
3008         struct prefixmsg        *pmsg;
3009         struct nlmsghdr         *nlh;
3010         unsigned char           *b = skb->tail;
3011         struct prefix_cacheinfo ci;
3012
3013         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3014         pmsg = NLMSG_DATA(nlh);
3015         pmsg->prefix_family = AF_INET6;
3016         pmsg->prefix_pad1 = 0;
3017         pmsg->prefix_pad2 = 0;
3018         pmsg->prefix_ifindex = idev->dev->ifindex;
3019         pmsg->prefix_len = pinfo->prefix_len;
3020         pmsg->prefix_type = pinfo->type;
3021         pmsg->prefix_pad3 = 0;
3022
3023         pmsg->prefix_flags = 0;
3024         if (pinfo->onlink)
3025                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3026         if (pinfo->autoconf)
3027                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3028
3029         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3030
3031         ci.preferred_time = ntohl(pinfo->prefered);
3032         ci.valid_time = ntohl(pinfo->valid);
3033         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3034
3035         nlh->nlmsg_len = skb->tail - b;
3036         return skb->len;
3037
3038 nlmsg_failure:
3039 rtattr_failure:
3040         skb_trim(skb, b - skb->data);
3041         return -1;
3042 }
3043
3044 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3045                          struct prefix_info *pinfo)
3046 {
3047         struct sk_buff *skb;
3048         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3049
3050         skb = alloc_skb(size, GFP_ATOMIC);
3051         if (!skb) {
3052                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3053                 return;
3054         }
3055         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3056                 kfree_skb(skb);
3057                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3058                 return;
3059         }
3060         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3061         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3062 }
3063
3064 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3065         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3066         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3067         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3068         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3069         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3070         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3071         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3072         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3073         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3074                                       .dumpit   = inet6_dump_fib, },
3075 };
3076
3077 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3078 {
3079         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3080
3081         switch (event) {
3082         case RTM_NEWADDR:
3083                 dst_hold(&ifp->rt->u.dst);
3084                 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3085                         dst_release(&ifp->rt->u.dst);
3086                 if (ifp->idev->cnf.forwarding)
3087                         addrconf_join_anycast(ifp);
3088                 break;
3089         case RTM_DELADDR:
3090                 if (ifp->idev->cnf.forwarding)
3091                         addrconf_leave_anycast(ifp);
3092                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3093                 dst_hold(&ifp->rt->u.dst);
3094                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3095                         dst_free(&ifp->rt->u.dst);
3096                 else
3097                         dst_release(&ifp->rt->u.dst);
3098                 break;
3099         }
3100 }
3101
3102 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3103 {
3104         read_lock_bh(&addrconf_lock);
3105         if (likely(ifp->idev->dead == 0))
3106                 __ipv6_ifa_notify(event, ifp);
3107         read_unlock_bh(&addrconf_lock);
3108 }
3109
3110 #ifdef CONFIG_SYSCTL
3111
3112 static
3113 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3114                            void __user *buffer, size_t *lenp, loff_t *ppos)
3115 {
3116         int *valp = ctl->data;
3117         int val = *valp;
3118         int ret;
3119
3120         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3121
3122         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3123                 if (valp != &ipv6_devconf.forwarding) {
3124                         if ((!*valp) ^ (!val)) {
3125                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3126                                 if (idev == NULL)
3127                                         return ret;
3128                                 dev_forward_change(idev);
3129                         }
3130                 } else {
3131                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3132                         addrconf_forward_change();
3133                 }
3134                 if (*valp)
3135                         rt6_purge_dflt_routers();
3136         }
3137
3138         return ret;
3139 }
3140
3141 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3142                                             int __user *name, int nlen,
3143                                             void __user *oldval,
3144                                             size_t __user *oldlenp,
3145                                             void __user *newval, size_t newlen,
3146                                             void **context)
3147 {
3148         int *valp = table->data;
3149         int new;
3150
3151         if (!newval || !newlen)
3152                 return 0;
3153         if (newlen != sizeof(int))
3154                 return -EINVAL;
3155         if (get_user(new, (int __user *)newval))
3156                 return -EFAULT;
3157         if (new == *valp)
3158                 return 0;
3159         if (oldval && oldlenp) {
3160                 size_t len;
3161                 if (get_user(len, oldlenp))
3162                         return -EFAULT;
3163                 if (len) {
3164                         if (len > table->maxlen)
3165                                 len = table->maxlen;
3166                         if (copy_to_user(oldval, valp, len))
3167                                 return -EFAULT;
3168                         if (put_user(len, oldlenp))
3169                                 return -EFAULT;
3170                 }
3171         }
3172
3173         if (valp != &ipv6_devconf_dflt.forwarding) {
3174                 if (valp != &ipv6_devconf.forwarding) {
3175                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3176                         int changed;
3177                         if (unlikely(idev == NULL))
3178                                 return -ENODEV;
3179                         changed = (!*valp) ^ (!new);
3180                         *valp = new;
3181                         if (changed)
3182                                 dev_forward_change(idev);
3183                 } else {
3184                         *valp = new;
3185                         addrconf_forward_change();
3186                 }
3187
3188                 if (*valp)
3189                         rt6_purge_dflt_routers();
3190         } else
3191                 *valp = new;
3192
3193         return 1;
3194 }
3195
3196 static struct addrconf_sysctl_table
3197 {
3198         struct ctl_table_header *sysctl_header;
3199         ctl_table addrconf_vars[__NET_IPV6_MAX];
3200         ctl_table addrconf_dev[2];
3201         ctl_table addrconf_conf_dir[2];
3202         ctl_table addrconf_proto_dir[2];
3203         ctl_table addrconf_root_dir[2];
3204 } addrconf_sysctl = {
3205         .sysctl_header = NULL,
3206         .addrconf_vars = {
3207                 {
3208                         .ctl_name       =       NET_IPV6_FORWARDING,
3209                         .procname       =       "forwarding",
3210                         .data           =       &ipv6_devconf.forwarding,
3211                         .maxlen         =       sizeof(int),
3212                         .mode           =       0644,
3213                         .proc_handler   =       &addrconf_sysctl_forward,
3214                         .strategy       =       &addrconf_sysctl_forward_strategy,
3215                 },
3216                 {
3217                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3218                         .procname       =       "hop_limit",
3219                         .data           =       &ipv6_devconf.hop_limit,
3220                         .maxlen         =       sizeof(int),
3221                         .mode           =       0644,
3222                         .proc_handler   =       proc_dointvec,
3223                 },
3224                 {
3225                         .ctl_name       =       NET_IPV6_MTU,
3226                         .procname       =       "mtu",
3227                         .data           =       &ipv6_devconf.mtu6,
3228                         .maxlen         =       sizeof(int),
3229                         .mode           =       0644,
3230                         .proc_handler   =       &proc_dointvec,
3231                 },
3232                 {
3233                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3234                         .procname       =       "accept_ra",
3235                         .data           =       &ipv6_devconf.accept_ra,
3236                         .maxlen         =       sizeof(int),
3237                         .mode           =       0644,
3238                         .proc_handler   =       &proc_dointvec,
3239                 },
3240                 {
3241                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3242                         .procname       =       "accept_redirects",
3243                         .data           =       &ipv6_devconf.accept_redirects,
3244                         .maxlen         =       sizeof(int),
3245                         .mode           =       0644,
3246                         .proc_handler   =       &proc_dointvec,
3247                 },
3248                 {
3249                         .ctl_name       =       NET_IPV6_AUTOCONF,
3250                         .procname       =       "autoconf",
3251                         .data           =       &ipv6_devconf.autoconf,
3252                         .maxlen         =       sizeof(int),
3253                         .mode           =       0644,
3254                         .proc_handler   =       &proc_dointvec,
3255                 },
3256                 {
3257                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3258                         .procname       =       "dad_transmits",
3259                         .data           =       &ipv6_devconf.dad_transmits,
3260                         .maxlen         =       sizeof(int),
3261                         .mode           =       0644,
3262                         .proc_handler   =       &proc_dointvec,
3263                 },
3264                 {
3265                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3266                         .procname       =       "router_solicitations",
3267                         .data           =       &ipv6_devconf.rtr_solicits,
3268                         .maxlen         =       sizeof(int),
3269                         .mode           =       0644,
3270                         .proc_handler   =       &proc_dointvec,
3271                 },
3272                 {
3273                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3274                         .procname       =       "router_solicitation_interval",
3275                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3276                         .maxlen         =       sizeof(int),
3277                         .mode           =       0644,
3278                         .proc_handler   =       &proc_dointvec_jiffies,
3279                         .strategy       =       &sysctl_jiffies,
3280                 },
3281                 {
3282                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3283                         .procname       =       "router_solicitation_delay",
3284                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3285                         .maxlen         =       sizeof(int),
3286                         .mode           =       0644,
3287                         .proc_handler   =       &proc_dointvec_jiffies,
3288                         .strategy       =       &sysctl_jiffies,
3289                 },
3290                 {
3291                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3292                         .procname       =       "force_mld_version",
3293                         .data           =       &ipv6_devconf.force_mld_version,
3294                         .maxlen         =       sizeof(int),
3295                         .mode           =       0644,
3296                         .proc_handler   =       &proc_dointvec,
3297                 },
3298 #ifdef CONFIG_IPV6_PRIVACY
3299                 {
3300                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3301                         .procname       =       "use_tempaddr",
3302                         .data           =       &ipv6_devconf.use_tempaddr,
3303                         .maxlen         =       sizeof(int),
3304                         .mode           =       0644,
3305                         .proc_handler   =       &proc_dointvec,
3306                 },
3307                 {
3308                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3309                         .procname       =       "temp_valid_lft",
3310                         .data           =       &ipv6_devconf.temp_valid_lft,
3311                         .maxlen         =       sizeof(int),
3312                         .mode           =       0644,
3313                         .proc_handler   =       &proc_dointvec,
3314                 },
3315                 {
3316                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3317                         .procname       =       "temp_prefered_lft",
3318                         .data           =       &ipv6_devconf.temp_prefered_lft,
3319                         .maxlen         =       sizeof(int),
3320                         .mode           =       0644,
3321                         .proc_handler   =       &proc_dointvec,
3322                 },
3323                 {
3324                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3325                         .procname       =       "regen_max_retry",
3326                         .data           =       &ipv6_devconf.regen_max_retry,
3327                         .maxlen         =       sizeof(int),
3328                         .mode           =       0644,
3329                         .proc_handler   =       &proc_dointvec,
3330                 },
3331                 {
3332                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3333                         .procname       =       "max_desync_factor",
3334                         .data           =       &ipv6_devconf.max_desync_factor,
3335                         .maxlen         =       sizeof(int),
3336                         .mode           =       0644,
3337                         .proc_handler   =       &proc_dointvec,
3338                 },
3339 #endif
3340                 {
3341                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3342                         .procname       =       "max_addresses",
3343                         .data           =       &ipv6_devconf.max_addresses,
3344                         .maxlen         =       sizeof(int),
3345                         .mode           =       0644,
3346                         .proc_handler   =       &proc_dointvec,
3347                 },
3348                 {
3349                         .ctl_name       =       0,      /* sentinel */
3350                 }
3351         },
3352         .addrconf_dev = {
3353                 {
3354                         .ctl_name       =       NET_PROTO_CONF_ALL,
3355                         .procname       =       "all",
3356                         .mode           =       0555,
3357                         .child          =       addrconf_sysctl.addrconf_vars,
3358                 },
3359                 {
3360                         .ctl_name       =       0,      /* sentinel */
3361                 }
3362         },
3363         .addrconf_conf_dir = {
3364                 {
3365                         .ctl_name       =       NET_IPV6_CONF,
3366                         .procname       =       "conf",
3367                         .mode           =       0555,
3368                         .child          =       addrconf_sysctl.addrconf_dev,
3369                 },
3370                 {
3371                         .ctl_name       =       0,      /* sentinel */
3372                 }
3373         },
3374         .addrconf_proto_dir = {
3375                 {
3376                         .ctl_name       =       NET_IPV6,
3377                         .procname       =       "ipv6",
3378                         .mode           =       0555,
3379                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3380                 },
3381                 {
3382                         .ctl_name       =       0,      /* sentinel */
3383                 }
3384         },
3385         .addrconf_root_dir = {
3386                 {
3387                         .ctl_name       =       CTL_NET,
3388                         .procname       =       "net",
3389                         .mode           =       0555,
3390                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3391                 },
3392                 {
3393                         .ctl_name       =       0,      /* sentinel */
3394                 }
3395         },
3396 };
3397
3398 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3399 {
3400         int i;
3401         struct net_device *dev = idev ? idev->dev : NULL;
3402         struct addrconf_sysctl_table *t;
3403         char *dev_name = NULL;
3404
3405         t = kmalloc(sizeof(*t), GFP_KERNEL);
3406         if (t == NULL)
3407                 return;
3408         memcpy(t, &addrconf_sysctl, sizeof(*t));
3409         for (i=0; t->addrconf_vars[i].data; i++) {
3410                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3411                 t->addrconf_vars[i].de = NULL;
3412                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3413         }
3414         if (dev) {
3415                 dev_name = dev->name;
3416                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3417         } else {
3418                 dev_name = "default";
3419                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3420         }
3421
3422         /*
3423          * Make a copy of dev_name, because '.procname' is regarded as const
3424          * by sysctl and we wouldn't want anyone to change it under our feet
3425          * (see SIOCSIFNAME).
3426          */
3427         dev_name = kstrdup(dev_name, GFP_KERNEL);
3428         if (!dev_name)
3429             goto free;
3430
3431         t->addrconf_dev[0].procname = dev_name;
3432
3433         t->addrconf_dev[0].child = t->addrconf_vars;
3434         t->addrconf_dev[0].de = NULL;
3435         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3436         t->addrconf_conf_dir[0].de = NULL;
3437         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3438         t->addrconf_proto_dir[0].de = NULL;
3439         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3440         t->addrconf_root_dir[0].de = NULL;
3441
3442         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3443         if (t->sysctl_header == NULL)
3444                 goto free_procname;
3445         else
3446                 p->sysctl = t;
3447         return;
3448
3449         /* error path */
3450  free_procname:
3451         kfree(dev_name);
3452  free:
3453         kfree(t);
3454
3455         return;
3456 }
3457
3458 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3459 {
3460         if (p->sysctl) {
3461                 struct addrconf_sysctl_table *t = p->sysctl;
3462                 p->sysctl = NULL;
3463                 unregister_sysctl_table(t->sysctl_header);
3464                 kfree(t->addrconf_dev[0].procname);
3465                 kfree(t);
3466         }
3467 }
3468
3469
3470 #endif
3471
3472 /*
3473  *      Device notifier
3474  */
3475
3476 int register_inet6addr_notifier(struct notifier_block *nb)
3477 {
3478         return notifier_chain_register(&inet6addr_chain, nb);
3479 }
3480
3481 int unregister_inet6addr_notifier(struct notifier_block *nb)
3482 {
3483         return notifier_chain_unregister(&inet6addr_chain,nb);
3484 }
3485
3486 /*
3487  *      Init / cleanup code
3488  */
3489
3490 int __init addrconf_init(void)
3491 {
3492         int err = 0;
3493
3494         /* The addrconf netdev notifier requires that loopback_dev
3495          * has it's ipv6 private information allocated and setup
3496          * before it can bring up and give link-local addresses
3497          * to other devices which are up.
3498          *
3499          * Unfortunately, loopback_dev is not necessarily the first
3500          * entry in the global dev_base list of net devices.  In fact,
3501          * it is likely to be the very last entry on that list.
3502          * So this causes the notifier registry below to try and
3503          * give link-local addresses to all devices besides loopback_dev
3504          * first, then loopback_dev, which cases all the non-loopback_dev
3505          * devices to fail to get a link-local address.
3506          *
3507          * So, as a temporary fix, allocate the ipv6 structure for
3508          * loopback_dev first by hand.
3509          * Longer term, all of the dependencies ipv6 has upon the loopback
3510          * device and it being up should be removed.
3511          */
3512         rtnl_lock();
3513         if (!ipv6_add_dev(&loopback_dev))
3514                 err = -ENOMEM;
3515         rtnl_unlock();
3516         if (err)
3517                 return err;
3518
3519         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3520
3521         register_netdevice_notifier(&ipv6_dev_notf);
3522
3523 #ifdef CONFIG_IPV6_PRIVACY
3524         md5_tfm = crypto_alloc_tfm("md5", 0);
3525         if (unlikely(md5_tfm == NULL))
3526                 printk(KERN_WARNING
3527                         "failed to load transform for md5\n");
3528 #endif
3529
3530         addrconf_verify(0);
3531         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3532 #ifdef CONFIG_SYSCTL
3533         addrconf_sysctl.sysctl_header =
3534                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3535         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3536 #endif
3537
3538         return 0;
3539 }
3540
3541 void __exit addrconf_cleanup(void)
3542 {
3543         struct net_device *dev;
3544         struct inet6_dev *idev;
3545         struct inet6_ifaddr *ifa;
3546         int i;
3547
3548         unregister_netdevice_notifier(&ipv6_dev_notf);
3549
3550         rtnetlink_links[PF_INET6] = NULL;
3551 #ifdef CONFIG_SYSCTL
3552         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3553         addrconf_sysctl_unregister(&ipv6_devconf);
3554 #endif
3555
3556         rtnl_lock();
3557
3558         /*
3559          *      clean dev list.
3560          */
3561
3562         for (dev=dev_base; dev; dev=dev->next) {
3563                 if ((idev = __in6_dev_get(dev)) == NULL)
3564                         continue;
3565                 addrconf_ifdown(dev, 1);
3566         }
3567         addrconf_ifdown(&loopback_dev, 2);
3568
3569         /*
3570          *      Check hash table.
3571          */
3572
3573         write_lock_bh(&addrconf_hash_lock);
3574         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3575                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3576                         struct inet6_ifaddr *bifa;
3577
3578                         bifa = ifa;
3579                         ifa = ifa->lst_next;
3580                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3581                         /* Do not free it; something is wrong.
3582                            Now we can investigate it with debugger.
3583                          */
3584                 }
3585         }
3586         write_unlock_bh(&addrconf_hash_lock);
3587
3588         del_timer(&addr_chk_timer);
3589
3590         rtnl_unlock();
3591
3592 #ifdef CONFIG_IPV6_PRIVACY
3593         crypto_free_tfm(md5_tfm);
3594         md5_tfm = NULL;
3595 #endif
3596
3597 #ifdef CONFIG_PROC_FS
3598         proc_net_remove("if_inet6");
3599 #endif
3600 }