net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  */
  39
  40 #include <linux/config.h>
  41 #include <linux/errno.h>
  42 #include <linux/types.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/sched.h>
  46 #include <linux/net.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_arp.h>
  50 #include <linux/if_arcnet.h>
  51 #include <linux/if_infiniband.h>
  52 #include <linux/route.h>
  53 #include <linux/inetdevice.h>
  54 #include <linux/init.h>
  55 #ifdef CONFIG_SYSCTL
  56 #include <linux/sysctl.h>
  57 #endif
  58 #include <linux/delay.h>
  59 #include <linux/notifier.h>
  60
  61 #include <net/sock.h>
  62 #include <net/snmp.h>
  63
  64 #include <net/ipv6.h>
  65 #include <net/protocol.h>
  66 #include <net/ndisc.h>
  67 #include <net/ip6_route.h>
  68 #include <net/addrconf.h>
  69 #include <net/tcp.h>
  70 #include <net/ip.h>
  71 #include <linux/if_tunnel.h>
  72 #include <linux/rtnetlink.h>
  73
  74 #ifdef CONFIG_IPV6_PRIVACY
  75 #include <linux/random.h>
  76 #include <linux/crypto.h>
  77 #include <asm/scatterlist.h>
  78 #endif
  79
  80 #include <asm/uaccess.h>
  81
  82 #include <linux/proc_fs.h>
  83 #include <linux/seq_file.h>
  84
  85 /* Set to 3 to get tracing... */
  86 #define ACONF_DEBUG 2
  87
  88 #if ACONF_DEBUG >= 3
  89 #define ADBG(x) printk x
  90 #else
  91 #define ADBG(x)
  92 #endif
  93
  94 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  95 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  96
  97 #ifdef CONFIG_SYSCTL
  98 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
  99 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 100 #endif
 101
 102 #ifdef CONFIG_IPV6_PRIVACY
 103 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 104 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 105 static void ipv6_regen_rndid(unsigned long data);
 106
 107 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 108 static struct crypto_tfm *md5_tfm;
 109 static DEFINE_SPINLOCK(md5_tfm_lock);
 110 #endif
 111
 112 static int ipv6_count_addresses(struct inet6_dev *idev);
 113
 114 /*
 115  *      Configured unicast address hash table
 116  */
 117 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 118 static DEFINE_RWLOCK(addrconf_hash_lock);
 119
 120 /* Protects inet6 devices */
 121 DEFINE_RWLOCK(addrconf_lock);
 122
 123 static void addrconf_verify(unsigned long);
 124
 125 static struct timer_list addr_chk_timer =
 126                         TIMER_INITIALIZER(addrconf_verify, 0, 0);
 127 static DEFINE_SPINLOCK(addrconf_verify_lock);
 128
 129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 131
 132 static int addrconf_ifdown(struct net_device *dev, int how);
 133
 134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, int flags);
 135 static void addrconf_dad_timer(unsigned long data);
 136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 137 static void addrconf_rs_timer(unsigned long data);
 138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140
 141 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 142                                 struct prefix_info *pinfo);
 143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 144
 145 static struct notifier_block *inet6addr_chain;
 146
 147 struct ipv6_devconf ipv6_devconf = {
 148         .forwarding             = 0,
 149         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 150         .mtu6                   = IPV6_MIN_MTU,
 151         .accept_ra              = 1,
 152         .accept_redirects       = 1,
 153         .autoconf               = 1,
 154         .force_mld_version      = 0,
 155         .dad_transmits          = 1,
 156         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 157         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 158         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 159 #ifdef CONFIG_IPV6_PRIVACY
 160         .use_tempaddr           = 0,
 161         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 162         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 163         .regen_max_retry        = REGEN_MAX_RETRY,
 164         .max_desync_factor      = MAX_DESYNC_FACTOR,
 165 #endif
 166         .max_addresses          = IPV6_MAX_ADDRESSES,
 167 };
 168
 169 static struct ipv6_devconf ipv6_devconf_dflt = {
 170         .forwarding             = 0,
 171         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 172         .mtu6                   = IPV6_MIN_MTU,
 173         .accept_ra              = 1,
 174         .accept_redirects       = 1,
 175         .autoconf               = 1,
 176         .dad_transmits          = 1,
 177         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 178         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 179         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 180 #ifdef CONFIG_IPV6_PRIVACY
 181         .use_tempaddr           = 0,
 182         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 183         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 184         .regen_max_retry        = REGEN_MAX_RETRY,
 185         .max_desync_factor      = MAX_DESYNC_FACTOR,
 186 #endif
 187         .max_addresses          = IPV6_MAX_ADDRESSES,
 188 };
 189
 190 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 191 #if 0
 192 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 193 #endif
 194 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 195
 196 int ipv6_addr_type(const struct in6_addr *addr)
 197 {
 198         int type;
 199         u32 st;
 200
 201         st = addr->s6_addr32[0];
 202
 203         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 204                 type = IPV6_ADDR_MULTICAST;
 205
 206                 switch((st & htonl(0x00FF0000))) {
 207                         case __constant_htonl(0x00010000):
 208                                 type |= IPV6_ADDR_LOOPBACK;
 209                                 break;
 210
 211                         case __constant_htonl(0x00020000):
 212                                 type |= IPV6_ADDR_LINKLOCAL;
 213                                 break;
 214
 215                         case __constant_htonl(0x00050000):
 216                                 type |= IPV6_ADDR_SITELOCAL;
 217                                 break;
 218                 };
 219                 return type;
 220         }
 221
 222         type = IPV6_ADDR_UNICAST;
 223
 224         /* Consider all addresses with the first three bits different of
 225            000 and 111 as finished.
 226          */
 227         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 228             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 229                 return type;
 230
 231         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 232                 return (IPV6_ADDR_LINKLOCAL | type);
 233
 234         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 235                 return (IPV6_ADDR_SITELOCAL | type);
 236
 237         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 238                 if (addr->s6_addr32[2] == 0) {
 239                         if (addr->s6_addr32[3] == 0)
 240                                 return IPV6_ADDR_ANY;
 241
 242                         if (addr->s6_addr32[3] == htonl(0x00000001))
 243                                 return (IPV6_ADDR_LOOPBACK | type);
 244
 245                         return (IPV6_ADDR_COMPATv4 | type);
 246                 }
 247
 248                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 249                         return IPV6_ADDR_MAPPED;
 250         }
 251
 252         st &= htonl(0xFF000000);
 253         if (st == 0)
 254                 return IPV6_ADDR_RESERVED;
 255         st &= htonl(0xFE000000);
 256         if (st == htonl(0x02000000))
 257                 return IPV6_ADDR_RESERVED;      /* for NSAP */
 258         if (st == htonl(0x04000000))
 259                 return IPV6_ADDR_RESERVED;      /* for IPX */
 260         return type;
 261 }
 262
 263 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 264 {
 265         if (del_timer(&ifp->timer))
 266                 __in6_ifa_put(ifp);
 267 }
 268
 269 enum addrconf_timer_t
 270 {
 271         AC_NONE,
 272         AC_DAD,
 273         AC_RS,
 274 };
 275
 276 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 277                                enum addrconf_timer_t what,
 278                                unsigned long when)
 279 {
 280         if (!del_timer(&ifp->timer))
 281                 in6_ifa_hold(ifp);
 282
 283         switch (what) {
 284         case AC_DAD:
 285                 ifp->timer.function = addrconf_dad_timer;
 286                 break;
 287         case AC_RS:
 288                 ifp->timer.function = addrconf_rs_timer;
 289                 break;
 290         default:;
 291         }
 292         ifp->timer.expires = jiffies + when;
 293         add_timer(&ifp->timer);
 294 }
 295
 296 /* Nobody refers to this device, we may destroy it. */
 297
 298 void in6_dev_finish_destroy(struct inet6_dev *idev)
 299 {
 300         struct net_device *dev = idev->dev;
 301         BUG_TRAP(idev->addr_list==NULL);
 302         BUG_TRAP(idev->mc_list==NULL);
 303 #ifdef NET_REFCNT_DEBUG
 304         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 305 #endif
 306         dev_put(dev);
 307         if (!idev->dead) {
 308                 printk("Freeing alive inet6 device %p\n", idev);
 309                 return;
 310         }
 311         snmp6_free_dev(idev);
 312         kfree(idev);
 313 }
 314
 315 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 316 {
 317         struct inet6_dev *ndev;
 318
 319         ASSERT_RTNL();
 320
 321         if (dev->mtu < IPV6_MIN_MTU)
 322                 return NULL;
 323
 324         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 325
 326         if (ndev) {
 327                 memset(ndev, 0, sizeof(struct inet6_dev));
 328
 329                 rwlock_init(&ndev->lock);
 330                 ndev->dev = dev;
 331                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 332                 ndev->cnf.mtu6 = dev->mtu;
 333                 ndev->cnf.sysctl = NULL;
 334                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 335                 if (ndev->nd_parms == NULL) {
 336                         kfree(ndev);
 337                         return NULL;
 338                 }
 339                 /* We refer to the device */
 340                 dev_hold(dev);
 341
 342                 if (snmp6_alloc_dev(ndev) < 0) {
 343                         ADBG((KERN_WARNING
 344                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
 345                                 __FUNCTION__, dev->name));
 346                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 347                         ndev->dead = 1;
 348                         in6_dev_finish_destroy(ndev);
 349                         return NULL;
 350                 }
 351
 352                 if (snmp6_register_dev(ndev) < 0) {
 353                         ADBG((KERN_WARNING
 354                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 355                                 __FUNCTION__, dev->name));
 356                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 357                         ndev->dead = 1;
 358                         in6_dev_finish_destroy(ndev);
 359                         return NULL;
 360                 }
 361
 362                 /* One reference from device.  We must do this before
 363                  * we invoke __ipv6_regen_rndid().
 364                  */
 365                 in6_dev_hold(ndev);
 366
 367 #ifdef CONFIG_IPV6_PRIVACY
 368                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
 369                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
 370                 init_timer(&ndev->regen_timer);
 371                 ndev->regen_timer.function = ipv6_regen_rndid;
 372                 ndev->regen_timer.data = (unsigned long) ndev;
 373                 if ((dev->flags&IFF_LOOPBACK) ||
 374                     dev->type == ARPHRD_TUNNEL ||
 375                     dev->type == ARPHRD_SIT) {
 376                         printk(KERN_INFO
 377                                 "Disabled Privacy Extensions on device %p(%s)\n",
 378                                 dev, dev->name);
 379                         ndev->cnf.use_tempaddr = -1;
 380                 } else {
 381                         in6_dev_hold(ndev);
 382                         ipv6_regen_rndid((unsigned long) ndev);
 383                 }
 384 #endif
 385
 386                 write_lock_bh(&addrconf_lock);
 387                 dev->ip6_ptr = ndev;
 388                 write_unlock_bh(&addrconf_lock);
 389
 390                 ipv6_mc_init_dev(ndev);
 391                 ndev->tstamp = jiffies;
 392 #ifdef CONFIG_SYSCTL
 393                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 394                         NET_IPV6_NEIGH, "ipv6", &ndisc_ifinfo_sysctl_change);
 395                 addrconf_sysctl_register(ndev, &ndev->cnf);
 396 #endif
 397         }
 398         return ndev;
 399 }
 400
 401 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 402 {
 403         struct inet6_dev *idev;
 404
 405         ASSERT_RTNL();
 406
 407         if ((idev = __in6_dev_get(dev)) == NULL) {
 408                 if ((idev = ipv6_add_dev(dev)) == NULL)
 409                         return NULL;
 410         }
 411         if (dev->flags&IFF_UP)
 412                 ipv6_mc_up(idev);
 413         return idev;
 414 }
 415
 416 #ifdef CONFIG_SYSCTL
 417 static void dev_forward_change(struct inet6_dev *idev)
 418 {
 419         struct net_device *dev;
 420         struct inet6_ifaddr *ifa;
 421         struct in6_addr addr;
 422
 423         if (!idev)
 424                 return;
 425         dev = idev->dev;
 426         if (dev && (dev->flags & IFF_MULTICAST)) {
 427                 ipv6_addr_all_routers(&addr);
 428
 429                 if (idev->cnf.forwarding)
 430                         ipv6_dev_mc_inc(dev, &addr);
 431                 else
 432                         ipv6_dev_mc_dec(dev, &addr);
 433         }
 434         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 435                 if (idev->cnf.forwarding)
 436                         addrconf_join_anycast(ifa);
 437                 else
 438                         addrconf_leave_anycast(ifa);
 439         }
 440 }
 441
 442
 443 static void addrconf_forward_change(void)
 444 {
 445         struct net_device *dev;
 446         struct inet6_dev *idev;
 447
 448         read_lock(&dev_base_lock);
 449         for (dev=dev_base; dev; dev=dev->next) {
 450                 read_lock(&addrconf_lock);
 451                 idev = __in6_dev_get(dev);
 452                 if (idev) {
 453                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 454                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 455                         if (changed)
 456                                 dev_forward_change(idev);
 457                 }
 458                 read_unlock(&addrconf_lock);
 459         }
 460         read_unlock(&dev_base_lock);
 461 }
 462 #endif
 463
 464 /* Nobody refers to this ifaddr, destroy it */
 465
 466 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 467 {
 468         BUG_TRAP(ifp->if_next==NULL);
 469         BUG_TRAP(ifp->lst_next==NULL);
 470 #ifdef NET_REFCNT_DEBUG
 471         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 472 #endif
 473
 474         in6_dev_put(ifp->idev);
 475
 476         if (del_timer(&ifp->timer))
 477                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 478
 479         if (!ifp->dead) {
 480                 printk("Freeing alive inet6 address %p\n", ifp);
 481                 return;
 482         }
 483         dst_release(&ifp->rt->u.dst);
 484
 485         kfree(ifp);
 486 }
 487
 488 /* On success it returns ifp with increased reference count */
 489
 490 static struct inet6_ifaddr *
 491 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 492               int scope, unsigned flags)
 493 {
 494         struct inet6_ifaddr *ifa = NULL;
 495         struct rt6_info *rt;
 496         int hash;
 497         int err = 0;
 498
 499         read_lock_bh(&addrconf_lock);
 500         if (idev->dead) {
 501                 err = -ENODEV;                  /*XXX*/
 502                 goto out2;
 503         }
 504
 505         write_lock(&addrconf_hash_lock);
 506
 507         /* Ignore adding duplicate addresses on an interface */
 508         if (ipv6_chk_same_addr(addr, idev->dev)) {
 509                 ADBG(("ipv6_add_addr: already assigned\n"));
 510                 err = -EEXIST;
 511                 goto out;
 512         }
 513
 514         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 515
 516         if (ifa == NULL) {
 517                 ADBG(("ipv6_add_addr: malloc failed\n"));
 518                 err = -ENOBUFS;
 519                 goto out;
 520         }
 521
 522         rt = addrconf_dst_alloc(idev, addr, 0);
 523         if (IS_ERR(rt)) {
 524                 err = PTR_ERR(rt);
 525                 goto out;
 526         }
 527
 528         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 529         ipv6_addr_copy(&ifa->addr, addr);
 530
 531         spin_lock_init(&ifa->lock);
 532         init_timer(&ifa->timer);
 533         ifa->timer.data = (unsigned long) ifa;
 534         ifa->scope = scope;
 535         ifa->prefix_len = pfxlen;
 536         ifa->flags = flags | IFA_F_TENTATIVE;
 537         ifa->cstamp = ifa->tstamp = jiffies;
 538
 539         ifa->idev = idev;
 540         in6_dev_hold(idev);
 541         /* For caller */
 542         in6_ifa_hold(ifa);
 543
 544         /* Add to big hash table */
 545         hash = ipv6_addr_hash(addr);
 546
 547         ifa->lst_next = inet6_addr_lst[hash];
 548         inet6_addr_lst[hash] = ifa;
 549         in6_ifa_hold(ifa);
 550         write_unlock(&addrconf_hash_lock);
 551
 552         write_lock(&idev->lock);
 553         /* Add to inet6_dev unicast addr list. */
 554         ifa->if_next = idev->addr_list;
 555         idev->addr_list = ifa;
 556
 557 #ifdef CONFIG_IPV6_PRIVACY
 558         if (ifa->flags&IFA_F_TEMPORARY) {
 559                 ifa->tmp_next = idev->tempaddr_list;
 560                 idev->tempaddr_list = ifa;
 561                 in6_ifa_hold(ifa);
 562         }
 563 #endif
 564
 565         ifa->rt = rt;
 566
 567         in6_ifa_hold(ifa);
 568         write_unlock(&idev->lock);
 569 out2:
 570         read_unlock_bh(&addrconf_lock);
 571
 572         if (unlikely(err == 0))
 573                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 574         else {
 575                 kfree(ifa);
 576                 ifa = ERR_PTR(err);
 577         }
 578
 579         return ifa;
 580 out:
 581         write_unlock(&addrconf_hash_lock);
 582         goto out2;
 583 }
 584
 585 /* This function wants to get referenced ifp and releases it before return */
 586
 587 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 588 {
 589         struct inet6_ifaddr *ifa, **ifap;
 590         struct inet6_dev *idev = ifp->idev;
 591         int hash;
 592
 593         hash = ipv6_addr_hash(&ifp->addr);
 594
 595         ifp->dead = 1;
 596
 597         write_lock_bh(&addrconf_hash_lock);
 598         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 599              ifap = &ifa->lst_next) {
 600                 if (ifa == ifp) {
 601                         *ifap = ifa->lst_next;
 602                         __in6_ifa_put(ifp);
 603                         ifa->lst_next = NULL;
 604                         break;
 605                 }
 606         }
 607         write_unlock_bh(&addrconf_hash_lock);
 608
 609         write_lock_bh(&idev->lock);
 610 #ifdef CONFIG_IPV6_PRIVACY
 611         if (ifp->flags&IFA_F_TEMPORARY) {
 612                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 613                      ifap = &ifa->tmp_next) {
 614                         if (ifa == ifp) {
 615                                 *ifap = ifa->tmp_next;
 616                                 if (ifp->ifpub) {
 617                                         in6_ifa_put(ifp->ifpub);
 618                                         ifp->ifpub = NULL;
 619                                 }
 620                                 __in6_ifa_put(ifp);
 621                                 ifa->tmp_next = NULL;
 622                                 break;
 623                         }
 624                 }
 625         }
 626 #endif
 627
 628         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
 629              ifap = &ifa->if_next) {
 630                 if (ifa == ifp) {
 631                         *ifap = ifa->if_next;
 632                         __in6_ifa_put(ifp);
 633                         ifa->if_next = NULL;
 634                         break;
 635                 }
 636         }
 637         write_unlock_bh(&idev->lock);
 638
 639         ipv6_ifa_notify(RTM_DELADDR, ifp);
 640
 641         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 642
 643         addrconf_del_timer(ifp);
 644
 645         in6_ifa_put(ifp);
 646 }
 647
 648 #ifdef CONFIG_IPV6_PRIVACY
 649 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 650 {
 651         struct inet6_dev *idev = ifp->idev;
 652         struct in6_addr addr, *tmpaddr;
 653         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 654         int tmp_plen;
 655         int ret = 0;
 656         int max_addresses;
 657
 658         write_lock(&idev->lock);
 659         if (ift) {
 660                 spin_lock_bh(&ift->lock);
 661                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 662                 spin_unlock_bh(&ift->lock);
 663                 tmpaddr = &addr;
 664         } else {
 665                 tmpaddr = NULL;
 666         }
 667 retry:
 668         in6_dev_hold(idev);
 669         if (idev->cnf.use_tempaddr <= 0) {
 670                 write_unlock(&idev->lock);
 671                 printk(KERN_INFO
 672                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 673                 in6_dev_put(idev);
 674                 ret = -1;
 675                 goto out;
 676         }
 677         spin_lock_bh(&ifp->lock);
 678         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 679                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 680                 spin_unlock_bh(&ifp->lock);
 681                 write_unlock(&idev->lock);
 682                 printk(KERN_WARNING
 683                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 684                 in6_dev_put(idev);
 685                 ret = -1;
 686                 goto out;
 687         }
 688         in6_ifa_hold(ifp);
 689         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 690         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 691                 spin_unlock_bh(&ifp->lock);
 692                 write_unlock(&idev->lock);
 693                 printk(KERN_WARNING
 694                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 695                 in6_ifa_put(ifp);
 696                 in6_dev_put(idev);
 697                 ret = -1;
 698                 goto out;
 699         }
 700         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 701         tmp_valid_lft = min_t(__u32,
 702                               ifp->valid_lft,
 703                               idev->cnf.temp_valid_lft);
 704         tmp_prefered_lft = min_t(__u32,
 705                                  ifp->prefered_lft,
 706                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 707         tmp_plen = ifp->prefix_len;
 708         max_addresses = idev->cnf.max_addresses;
 709         tmp_cstamp = ifp->cstamp;
 710         tmp_tstamp = ifp->tstamp;
 711         spin_unlock_bh(&ifp->lock);
 712
 713         write_unlock(&idev->lock);
 714         ift = !max_addresses ||
 715               ipv6_count_addresses(idev) < max_addresses ?
 716                 ipv6_add_addr(idev, &addr, tmp_plen,
 717                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 718         if (!ift || IS_ERR(ift)) {
 719                 in6_ifa_put(ifp);
 720                 in6_dev_put(idev);
 721                 printk(KERN_INFO
 722                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 723                 tmpaddr = &addr;
 724                 write_lock(&idev->lock);
 725                 goto retry;
 726         }
 727
 728         spin_lock_bh(&ift->lock);
 729         ift->ifpub = ifp;
 730         ift->valid_lft = tmp_valid_lft;
 731         ift->prefered_lft = tmp_prefered_lft;
 732         ift->cstamp = tmp_cstamp;
 733         ift->tstamp = tmp_tstamp;
 734         spin_unlock_bh(&ift->lock);
 735
 736         addrconf_dad_start(ift, 0);
 737         in6_ifa_put(ift);
 738         in6_dev_put(idev);
 739 out:
 740         return ret;
 741 }
 742 #endif
 743
 744 /*
 745  *      Choose an appropriate source address
 746  *      should do:
 747  *      i)      get an address with an appropriate scope
 748  *      ii)     see if there is a specific route for the destination and use
 749  *              an address of the attached interface
 750  *      iii)    don't use deprecated addresses
 751  */
 752 static int inline ipv6_saddr_pref(const struct inet6_ifaddr *ifp, u8 invpref)
 753 {
 754         int pref;
 755         pref = ifp->flags&IFA_F_DEPRECATED ? 0 : 2;
 756 #ifdef CONFIG_IPV6_PRIVACY
 757         pref |= (ifp->flags^invpref)&IFA_F_TEMPORARY ? 0 : 1;
 758 #endif
 759         return pref;
 760 }
 761
 762 #ifdef CONFIG_IPV6_PRIVACY
 763 #define IPV6_GET_SADDR_MAXSCORE(score)  ((score) == 3)
 764 #else
 765 #define IPV6_GET_SADDR_MAXSCORE(score)  (score)
 766 #endif
 767
 768 int ipv6_dev_get_saddr(struct net_device *dev,
 769                        struct in6_addr *daddr, struct in6_addr *saddr)
 770 {
 771         struct inet6_ifaddr *ifp = NULL;
 772         struct inet6_ifaddr *match = NULL;
 773         struct inet6_dev *idev;
 774         int scope;
 775         int err;
 776         int hiscore = -1, score;
 777
 778         scope = ipv6_addr_scope(daddr);
 779
 780         /*
 781          *      known dev
 782          *      search dev and walk through dev addresses
 783          */
 784
 785         if (dev) {
 786                 if (dev->flags & IFF_LOOPBACK)
 787                         scope = IFA_HOST;
 788
 789                 read_lock(&addrconf_lock);
 790                 idev = __in6_dev_get(dev);
 791                 if (idev) {
 792                         read_lock_bh(&idev->lock);
 793                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 794                                 if (ifp->scope == scope) {
 795                                         if (ifp->flags&IFA_F_TENTATIVE)
 796                                                 continue;
 797 #ifdef CONFIG_IPV6_PRIVACY
 798                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
 799 #else
 800                                         score = ipv6_saddr_pref(ifp, 0);
 801 #endif
 802                                         if (score <= hiscore)
 803                                                 continue;
 804
 805                                         if (match)
 806                                                 in6_ifa_put(match);
 807                                         match = ifp;
 808                                         hiscore = score;
 809                                         in6_ifa_hold(ifp);
 810
 811                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
 812                                                 read_unlock_bh(&idev->lock);
 813                                                 read_unlock(&addrconf_lock);
 814                                                 goto out;
 815                                         }
 816                                 }
 817                         }
 818                         read_unlock_bh(&idev->lock);
 819                 }
 820                 read_unlock(&addrconf_lock);
 821         }
 822
 823         if (scope == IFA_LINK)
 824                 goto out;
 825
 826         /*
 827          *      dev == NULL or search failed for specified dev
 828          */
 829
 830         read_lock(&dev_base_lock);
 831         read_lock(&addrconf_lock);
 832         for (dev = dev_base; dev; dev=dev->next) {
 833                 idev = __in6_dev_get(dev);
 834                 if (idev) {
 835                         read_lock_bh(&idev->lock);
 836                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 837                                 if (ifp->scope == scope) {
 838                                         if (ifp->flags&IFA_F_TENTATIVE)
 839                                                 continue;
 840 #ifdef CONFIG_IPV6_PRIVACY
 841                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
 842 #else
 843                                         score = ipv6_saddr_pref(ifp, 0);
 844 #endif
 845                                         if (score <= hiscore)
 846                                                 continue;
 847
 848                                         if (match)
 849                                                 in6_ifa_put(match);
 850                                         match = ifp;
 851                                         hiscore = score;
 852                                         in6_ifa_hold(ifp);
 853
 854                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
 855                                                 read_unlock_bh(&idev->lock);
 856                                                 goto out_unlock_base;
 857                                         }
 858                                 }
 859                         }
 860                         read_unlock_bh(&idev->lock);
 861                 }
 862         }
 863
 864 out_unlock_base:
 865         read_unlock(&addrconf_lock);
 866         read_unlock(&dev_base_lock);
 867
 868 out:
 869         err = -EADDRNOTAVAIL;
 870         if (match) {
 871                 ipv6_addr_copy(saddr, &match->addr);
 872                 err = 0;
 873                 in6_ifa_put(match);
 874         }
 875
 876         return err;
 877 }
 878
 879
 880 int ipv6_get_saddr(struct dst_entry *dst,
 881                    struct in6_addr *daddr, struct in6_addr *saddr)
 882 {
 883         return ipv6_dev_get_saddr(dst ? dst->dev : NULL, daddr, saddr);
 884 }
 885
 886
 887 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
 888 {
 889         struct inet6_dev *idev;
 890         int err = -EADDRNOTAVAIL;
 891
 892         read_lock(&addrconf_lock);
 893         if ((idev = __in6_dev_get(dev)) != NULL) {
 894                 struct inet6_ifaddr *ifp;
 895
 896                 read_lock_bh(&idev->lock);
 897                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
 898                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
 899                                 ipv6_addr_copy(addr, &ifp->addr);
 900                                 err = 0;
 901                                 break;
 902                         }
 903                 }
 904                 read_unlock_bh(&idev->lock);
 905         }
 906         read_unlock(&addrconf_lock);
 907         return err;
 908 }
 909
 910 static int ipv6_count_addresses(struct inet6_dev *idev)
 911 {
 912         int cnt = 0;
 913         struct inet6_ifaddr *ifp;
 914
 915         read_lock_bh(&idev->lock);
 916         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
 917                 cnt++;
 918         read_unlock_bh(&idev->lock);
 919         return cnt;
 920 }
 921
 922 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
 923 {
 924         struct inet6_ifaddr * ifp;
 925         u8 hash = ipv6_addr_hash(addr);
 926
 927         read_lock_bh(&addrconf_hash_lock);
 928         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
 929                 if (ipv6_addr_equal(&ifp->addr, addr) &&
 930                     !(ifp->flags&IFA_F_TENTATIVE)) {
 931                         if (dev == NULL || ifp->idev->dev == dev ||
 932                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
 933                                 break;
 934                 }
 935         }
 936         read_unlock_bh(&addrconf_hash_lock);
 937         return ifp != NULL;
 938 }
 939
 940 static
 941 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
 942 {
 943         struct inet6_ifaddr * ifp;
 944         u8 hash = ipv6_addr_hash(addr);
 945
 946         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
 947                 if (ipv6_addr_equal(&ifp->addr, addr)) {
 948                         if (dev == NULL || ifp->idev->dev == dev)
 949                                 break;
 950                 }
 951         }
 952         return ifp != NULL;
 953 }
 954
 955 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
 956 {
 957         struct inet6_ifaddr * ifp;
 958         u8 hash = ipv6_addr_hash(addr);
 959
 960         read_lock_bh(&addrconf_hash_lock);
 961         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
 962                 if (ipv6_addr_equal(&ifp->addr, addr)) {
 963                         if (dev == NULL || ifp->idev->dev == dev ||
 964                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
 965                                 in6_ifa_hold(ifp);
 966                                 break;
 967                         }
 968                 }
 969         }
 970         read_unlock_bh(&addrconf_hash_lock);
 971
 972         return ifp;
 973 }
 974
 975 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
 976 {
 977         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
 978         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
 979         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
 980         u32 sk2_rcv_saddr = tcp_v4_rcv_saddr(sk2);
 981         int sk_ipv6only = ipv6_only_sock(sk);
 982         int sk2_ipv6only = tcp_v6_ipv6only(sk2);
 983         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
 984         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
 985
 986         if (!sk2_rcv_saddr && !sk_ipv6only)
 987                 return 1;
 988
 989         if (addr_type2 == IPV6_ADDR_ANY &&
 990             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
 991                 return 1;
 992
 993         if (addr_type == IPV6_ADDR_ANY &&
 994             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
 995                 return 1;
 996
 997         if (sk2_rcv_saddr6 &&
 998             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
 999                 return 1;
1000
1001         if (addr_type == IPV6_ADDR_MAPPED &&
1002             !sk2_ipv6only &&
1003             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1004                 return 1;
1005
1006         return 0;
1007 }
1008
1009 /* Gets referenced address, destroys ifaddr */
1010
1011 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1012 {
1013         if (net_ratelimit())
1014                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1015         if (ifp->flags&IFA_F_PERMANENT) {
1016                 spin_lock_bh(&ifp->lock);
1017                 addrconf_del_timer(ifp);
1018                 ifp->flags |= IFA_F_TENTATIVE;
1019                 spin_unlock_bh(&ifp->lock);
1020                 in6_ifa_put(ifp);
1021 #ifdef CONFIG_IPV6_PRIVACY
1022         } else if (ifp->flags&IFA_F_TEMPORARY) {
1023                 struct inet6_ifaddr *ifpub;
1024                 spin_lock_bh(&ifp->lock);
1025                 ifpub = ifp->ifpub;
1026                 if (ifpub) {
1027                         in6_ifa_hold(ifpub);
1028                         spin_unlock_bh(&ifp->lock);
1029                         ipv6_create_tempaddr(ifpub, ifp);
1030                         in6_ifa_put(ifpub);
1031                 } else {
1032                         spin_unlock_bh(&ifp->lock);
1033                 }
1034                 ipv6_del_addr(ifp);
1035 #endif
1036         } else
1037                 ipv6_del_addr(ifp);
1038 }
1039
1040
1041 /* Join to solicited addr multicast group. */
1042
1043 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1044 {
1045         struct in6_addr maddr;
1046
1047         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1048                 return;
1049
1050         addrconf_addr_solict_mult(addr, &maddr);
1051         ipv6_dev_mc_inc(dev, &maddr);
1052 }
1053
1054 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1055 {
1056         struct in6_addr maddr;
1057
1058         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1059                 return;
1060
1061         addrconf_addr_solict_mult(addr, &maddr);
1062         __ipv6_dev_mc_dec(idev, &maddr);
1063 }
1064
1065 void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1066 {
1067         struct in6_addr addr;
1068         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1069         if (ipv6_addr_any(&addr))
1070                 return;
1071         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1072 }
1073
1074 void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1075 {
1076         struct in6_addr addr;
1077         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1078         if (ipv6_addr_any(&addr))
1079                 return;
1080         __ipv6_dev_ac_dec(ifp->idev, &addr);
1081 }
1082
1083 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1084 {
1085         switch (dev->type) {
1086         case ARPHRD_ETHER:
1087         case ARPHRD_FDDI:
1088         case ARPHRD_IEEE802_TR:
1089                 if (dev->addr_len != ETH_ALEN)
1090                         return -1;
1091                 memcpy(eui, dev->dev_addr, 3);
1092                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1093
1094                 /*
1095                  * The zSeries OSA network cards can be shared among various
1096                  * OS instances, but the OSA cards have only one MAC address.
1097                  * This leads to duplicate address conflicts in conjunction
1098                  * with IPv6 if more than one instance uses the same card.
1099                  *
1100                  * The driver for these cards can deliver a unique 16-bit
1101                  * identifier for each instance sharing the same card.  It is
1102                  * placed instead of 0xFFFE in the interface identifier.  The
1103                  * "u" bit of the interface identifier is not inverted in this
1104                  * case.  Hence the resulting interface identifier has local
1105                  * scope according to RFC2373.
1106                  */
1107                 if (dev->dev_id) {
1108                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1109                         eui[4] = dev->dev_id & 0xFF;
1110                 } else {
1111                         eui[3] = 0xFF;
1112                         eui[4] = 0xFE;
1113                         eui[0] ^= 2;
1114                 }
1115                 return 0;
1116         case ARPHRD_ARCNET:
1117                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1118                 if (dev->addr_len != ARCNET_ALEN)
1119                         return -1;
1120                 memset(eui, 0, 7);
1121                 eui[7] = *(u8*)dev->dev_addr;
1122                 return 0;
1123         case ARPHRD_INFINIBAND:
1124                 if (dev->addr_len != INFINIBAND_ALEN)
1125                         return -1;
1126                 memcpy(eui, dev->dev_addr + 12, 8);
1127                 eui[0] |= 2;
1128                 return 0;
1129         }
1130         return -1;
1131 }
1132
1133 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1134 {
1135         int err = -1;
1136         struct inet6_ifaddr *ifp;
1137
1138         read_lock_bh(&idev->lock);
1139         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1140                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1141                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1142                         err = 0;
1143                         break;
1144                 }
1145         }
1146         read_unlock_bh(&idev->lock);
1147         return err;
1148 }
1149
1150 #ifdef CONFIG_IPV6_PRIVACY
1151 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1152 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1153 {
1154         struct net_device *dev;
1155         struct scatterlist sg[2];
1156
1157         sg[0].page = virt_to_page(idev->entropy);
1158         sg[0].offset = offset_in_page(idev->entropy);
1159         sg[0].length = 8;
1160         sg[1].page = virt_to_page(idev->work_eui64);
1161         sg[1].offset = offset_in_page(idev->work_eui64);
1162         sg[1].length = 8;
1163
1164         dev = idev->dev;
1165
1166         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1167                 printk(KERN_INFO
1168                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1169                         idev);
1170                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1171         }
1172 regen:
1173         spin_lock(&md5_tfm_lock);
1174         if (unlikely(md5_tfm == NULL)) {
1175                 spin_unlock(&md5_tfm_lock);
1176                 return -1;
1177         }
1178         crypto_digest_init(md5_tfm);
1179         crypto_digest_update(md5_tfm, sg, 2);
1180         crypto_digest_final(md5_tfm, idev->work_digest);
1181         spin_unlock(&md5_tfm_lock);
1182
1183         memcpy(idev->rndid, &idev->work_digest[0], 8);
1184         idev->rndid[0] &= ~0x02;
1185         memcpy(idev->entropy, &idev->work_digest[8], 8);
1186
1187         /*
1188          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1189          * check if generated address is not inappropriate
1190          *
1191          *  - Reserved subnet anycast (RFC 2526)
1192          *      11111101 11....11 1xxxxxxx
1193          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1194          *      00-00-5E-FE-xx-xx-xx-xx
1195          *  - value 0
1196          *  - XXX: already assigned to an address on the device
1197          */
1198         if (idev->rndid[0] == 0xfd &&
1199             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1200             (idev->rndid[7]&0x80))
1201                 goto regen;
1202         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1203                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1204                         goto regen;
1205                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1206                         goto regen;
1207         }
1208
1209         return 0;
1210 }
1211
1212 static void ipv6_regen_rndid(unsigned long data)
1213 {
1214         struct inet6_dev *idev = (struct inet6_dev *) data;
1215         unsigned long expires;
1216
1217         read_lock_bh(&addrconf_lock);
1218         write_lock_bh(&idev->lock);
1219
1220         if (idev->dead)
1221                 goto out;
1222
1223         if (__ipv6_regen_rndid(idev) < 0)
1224                 goto out;
1225
1226         expires = jiffies +
1227                 idev->cnf.temp_prefered_lft * HZ -
1228                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1229         if (time_before(expires, jiffies)) {
1230                 printk(KERN_WARNING
1231                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1232                         idev->dev->name);
1233                 goto out;
1234         }
1235
1236         if (!mod_timer(&idev->regen_timer, expires))
1237                 in6_dev_hold(idev);
1238
1239 out:
1240         write_unlock_bh(&idev->lock);
1241         read_unlock_bh(&addrconf_lock);
1242         in6_dev_put(idev);
1243 }
1244
1245 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1246         int ret = 0;
1247
1248         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1249                 ret = __ipv6_regen_rndid(idev);
1250         return ret;
1251 }
1252 #endif
1253
1254 /*
1255  *      Add prefix route.
1256  */
1257
1258 static void
1259 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1260                       unsigned long expires, unsigned flags)
1261 {
1262         struct in6_rtmsg rtmsg;
1263
1264         memset(&rtmsg, 0, sizeof(rtmsg));
1265         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1266         rtmsg.rtmsg_dst_len = plen;
1267         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1268         rtmsg.rtmsg_ifindex = dev->ifindex;
1269         rtmsg.rtmsg_info = expires;
1270         rtmsg.rtmsg_flags = RTF_UP|flags;
1271         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1272
1273         /* Prevent useless cloning on PtP SIT.
1274            This thing is done here expecting that the whole
1275            class of non-broadcast devices need not cloning.
1276          */
1277         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1278                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1279
1280         ip6_route_add(&rtmsg, NULL, NULL);
1281 }
1282
1283 /* Create "default" multicast route to the interface */
1284
1285 static void addrconf_add_mroute(struct net_device *dev)
1286 {
1287         struct in6_rtmsg rtmsg;
1288
1289         memset(&rtmsg, 0, sizeof(rtmsg));
1290         ipv6_addr_set(&rtmsg.rtmsg_dst,
1291                       htonl(0xFF000000), 0, 0, 0);
1292         rtmsg.rtmsg_dst_len = 8;
1293         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1294         rtmsg.rtmsg_ifindex = dev->ifindex;
1295         rtmsg.rtmsg_flags = RTF_UP;
1296         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1297         ip6_route_add(&rtmsg, NULL, NULL);
1298 }
1299
1300 static void sit_route_add(struct net_device *dev)
1301 {
1302         struct in6_rtmsg rtmsg;
1303
1304         memset(&rtmsg, 0, sizeof(rtmsg));
1305
1306         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1307         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1308
1309         /* prefix length - 96 bits "::d.d.d.d" */
1310         rtmsg.rtmsg_dst_len     = 96;
1311         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1312         rtmsg.rtmsg_ifindex     = dev->ifindex;
1313
1314         ip6_route_add(&rtmsg, NULL, NULL);
1315 }
1316
1317 static void addrconf_add_lroute(struct net_device *dev)
1318 {
1319         struct in6_addr addr;
1320
1321         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1322         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1323 }
1324
1325 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1326 {
1327         struct inet6_dev *idev;
1328
1329         ASSERT_RTNL();
1330
1331         if ((idev = ipv6_find_idev(dev)) == NULL)
1332                 return NULL;
1333
1334         /* Add default multicast route */
1335         addrconf_add_mroute(dev);
1336
1337         /* Add link local route */
1338         addrconf_add_lroute(dev);
1339         return idev;
1340 }
1341
1342 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1343 {
1344         struct prefix_info *pinfo;
1345         __u32 valid_lft;
1346         __u32 prefered_lft;
1347         int addr_type;
1348         unsigned long rt_expires;
1349         struct inet6_dev *in6_dev;
1350
1351         pinfo = (struct prefix_info *) opt;
1352
1353         if (len < sizeof(struct prefix_info)) {
1354                 ADBG(("addrconf: prefix option too short\n"));
1355                 return;
1356         }
1357
1358         /*
1359          *      Validation checks ([ADDRCONF], page 19)
1360          */
1361
1362         addr_type = ipv6_addr_type(&pinfo->prefix);
1363
1364         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1365                 return;
1366
1367         valid_lft = ntohl(pinfo->valid);
1368         prefered_lft = ntohl(pinfo->prefered);
1369
1370         if (prefered_lft > valid_lft) {
1371                 if (net_ratelimit())
1372                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1373                 return;
1374         }
1375
1376         in6_dev = in6_dev_get(dev);
1377
1378         if (in6_dev == NULL) {
1379                 if (net_ratelimit())
1380                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1381                 return;
1382         }
1383
1384         /*
1385          *      Two things going on here:
1386          *      1) Add routes for on-link prefixes
1387          *      2) Configure prefixes with the auto flag set
1388          */
1389
1390         /* Avoid arithmetic overflow. Really, we could
1391            save rt_expires in seconds, likely valid_lft,
1392            but it would require division in fib gc, that it
1393            not good.
1394          */
1395         if (valid_lft >= 0x7FFFFFFF/HZ)
1396                 rt_expires = 0;
1397         else
1398                 rt_expires = jiffies + valid_lft * HZ;
1399
1400         if (pinfo->onlink) {
1401                 struct rt6_info *rt;
1402                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1403
1404                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1405                         if (rt->rt6i_flags&RTF_EXPIRES) {
1406                                 if (valid_lft == 0) {
1407                                         ip6_del_rt(rt, NULL, NULL);
1408                                         rt = NULL;
1409                                 } else {
1410                                         rt->rt6i_expires = rt_expires;
1411                                 }
1412                         }
1413                 } else if (valid_lft) {
1414                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1415                                               dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1416                 }
1417                 if (rt)
1418                         dst_release(&rt->u.dst);
1419         }
1420
1421         /* Try to figure out our local address for this prefix */
1422
1423         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1424                 struct inet6_ifaddr * ifp;
1425                 struct in6_addr addr;
1426                 int create = 0, update_lft = 0;
1427
1428                 if (pinfo->prefix_len == 64) {
1429                         memcpy(&addr, &pinfo->prefix, 8);
1430                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1431                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1432                                 in6_dev_put(in6_dev);
1433                                 return;
1434                         }
1435                         goto ok;
1436                 }
1437                 if (net_ratelimit())
1438                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1439                                pinfo->prefix_len);
1440                 in6_dev_put(in6_dev);
1441                 return;
1442
1443 ok:
1444
1445                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1446
1447                 if (ifp == NULL && valid_lft) {
1448                         int max_addresses = in6_dev->cnf.max_addresses;
1449
1450                         /* Do not allow to create too much of autoconfigured
1451                          * addresses; this would be too easy way to crash kernel.
1452                          */
1453                         if (!max_addresses ||
1454                             ipv6_count_addresses(in6_dev) < max_addresses)
1455                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1456                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1457
1458                         if (!ifp || IS_ERR(ifp)) {
1459                                 in6_dev_put(in6_dev);
1460                                 return;
1461                         }
1462
1463                         update_lft = create = 1;
1464                         ifp->cstamp = jiffies;
1465                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1466                 }
1467
1468                 if (ifp) {
1469                         int flags;
1470                         unsigned long now;
1471 #ifdef CONFIG_IPV6_PRIVACY
1472                         struct inet6_ifaddr *ift;
1473 #endif
1474                         u32 stored_lft;
1475
1476                         /* update lifetime (RFC2462 5.5.3 e) */
1477                         spin_lock(&ifp->lock);
1478                         now = jiffies;
1479                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1480                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1481                         else
1482                                 stored_lft = 0;
1483                         if (!update_lft && stored_lft) {
1484                                 if (valid_lft > MIN_VALID_LIFETIME ||
1485                                     valid_lft > stored_lft)
1486                                         update_lft = 1;
1487                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1488                                         /* valid_lft <= stored_lft is always true */
1489                                         /* XXX: IPsec */
1490                                         update_lft = 0;
1491                                 } else {
1492                                         valid_lft = MIN_VALID_LIFETIME;
1493                                         if (valid_lft < prefered_lft)
1494                                                 prefered_lft = valid_lft;
1495                                         update_lft = 1;
1496                                 }
1497                         }
1498
1499                         if (update_lft) {
1500                                 ifp->valid_lft = valid_lft;
1501                                 ifp->prefered_lft = prefered_lft;
1502                                 ifp->tstamp = now;
1503                                 flags = ifp->flags;
1504                                 ifp->flags &= ~IFA_F_DEPRECATED;
1505                                 spin_unlock(&ifp->lock);
1506
1507                                 if (!(flags&IFA_F_TENTATIVE))
1508                                         ipv6_ifa_notify(0, ifp);
1509                         } else
1510                                 spin_unlock(&ifp->lock);
1511
1512 #ifdef CONFIG_IPV6_PRIVACY
1513                         read_lock_bh(&in6_dev->lock);
1514                         /* update all temporary addresses in the list */
1515                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1516                                 /*
1517                                  * When adjusting the lifetimes of an existing
1518                                  * temporary address, only lower the lifetimes.
1519                                  * Implementations must not increase the
1520                                  * lifetimes of an existing temporary address
1521                                  * when processing a Prefix Information Option.
1522                                  */
1523                                 spin_lock(&ift->lock);
1524                                 flags = ift->flags;
1525                                 if (ift->valid_lft > valid_lft &&
1526                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1527                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1528                                 if (ift->prefered_lft > prefered_lft &&
1529                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1530                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1531                                 spin_unlock(&ift->lock);
1532                                 if (!(flags&IFA_F_TENTATIVE))
1533                                         ipv6_ifa_notify(0, ift);
1534                         }
1535
1536                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1537                                 /*
1538                                  * When a new public address is created as described in [ADDRCONF],
1539                                  * also create a new temporary address.
1540                                  */
1541                                 read_unlock_bh(&in6_dev->lock);
1542                                 ipv6_create_tempaddr(ifp, NULL);
1543                         } else {
1544                                 read_unlock_bh(&in6_dev->lock);
1545                         }
1546 #endif
1547                         in6_ifa_put(ifp);
1548                         addrconf_verify(0);
1549                 }
1550         }
1551         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1552         in6_dev_put(in6_dev);
1553 }
1554
1555 /*
1556  *      Set destination address.
1557  *      Special case for SIT interfaces where we create a new "virtual"
1558  *      device.
1559  */
1560 int addrconf_set_dstaddr(void __user *arg)
1561 {
1562         struct in6_ifreq ireq;
1563         struct net_device *dev;
1564         int err = -EINVAL;
1565
1566         rtnl_lock();
1567
1568         err = -EFAULT;
1569         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1570                 goto err_exit;
1571
1572         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1573
1574         err = -ENODEV;
1575         if (dev == NULL)
1576                 goto err_exit;
1577
1578         if (dev->type == ARPHRD_SIT) {
1579                 struct ifreq ifr;
1580                 mm_segment_t    oldfs;
1581                 struct ip_tunnel_parm p;
1582
1583                 err = -EADDRNOTAVAIL;
1584                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1585                         goto err_exit;
1586
1587                 memset(&p, 0, sizeof(p));
1588                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1589                 p.iph.saddr = 0;
1590                 p.iph.version = 4;
1591                 p.iph.ihl = 5;
1592                 p.iph.protocol = IPPROTO_IPV6;
1593                 p.iph.ttl = 64;
1594                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1595
1596                 oldfs = get_fs(); set_fs(KERNEL_DS);
1597                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1598                 set_fs(oldfs);
1599
1600                 if (err == 0) {
1601                         err = -ENOBUFS;
1602                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1603                                 goto err_exit;
1604                         err = dev_open(dev);
1605                 }
1606         }
1607
1608 err_exit:
1609         rtnl_unlock();
1610         return err;
1611 }
1612
1613 /*
1614  *      Manual configuration of address on an interface
1615  */
1616 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1617 {
1618         struct inet6_ifaddr *ifp;
1619         struct inet6_dev *idev;
1620         struct net_device *dev;
1621         int scope;
1622
1623         ASSERT_RTNL();
1624
1625         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1626                 return -ENODEV;
1627
1628         if (!(dev->flags&IFF_UP))
1629                 return -ENETDOWN;
1630
1631         if ((idev = addrconf_add_dev(dev)) == NULL)
1632                 return -ENOBUFS;
1633
1634         scope = ipv6_addr_scope(pfx);
1635
1636         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1637         if (!IS_ERR(ifp)) {
1638                 addrconf_dad_start(ifp, 0);
1639                 in6_ifa_put(ifp);
1640                 return 0;
1641         }
1642
1643         return PTR_ERR(ifp);
1644 }
1645
1646 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1647 {
1648         struct inet6_ifaddr *ifp;
1649         struct inet6_dev *idev;
1650         struct net_device *dev;
1651
1652         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1653                 return -ENODEV;
1654
1655         if ((idev = __in6_dev_get(dev)) == NULL)
1656                 return -ENXIO;
1657
1658         read_lock_bh(&idev->lock);
1659         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1660                 if (ifp->prefix_len == plen &&
1661                     ipv6_addr_equal(pfx, &ifp->addr)) {
1662                         in6_ifa_hold(ifp);
1663                         read_unlock_bh(&idev->lock);
1664
1665                         ipv6_del_addr(ifp);
1666
1667                         /* If the last address is deleted administratively,
1668                            disable IPv6 on this interface.
1669                          */
1670                         if (idev->addr_list == NULL)
1671                                 addrconf_ifdown(idev->dev, 1);
1672                         return 0;
1673                 }
1674         }
1675         read_unlock_bh(&idev->lock);
1676         return -EADDRNOTAVAIL;
1677 }
1678
1679
1680 int addrconf_add_ifaddr(void __user *arg)
1681 {
1682         struct in6_ifreq ireq;
1683         int err;
1684
1685         if (!capable(CAP_NET_ADMIN))
1686                 return -EPERM;
1687
1688         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1689                 return -EFAULT;
1690
1691         rtnl_lock();
1692         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1693         rtnl_unlock();
1694         return err;
1695 }
1696
1697 int addrconf_del_ifaddr(void __user *arg)
1698 {
1699         struct in6_ifreq ireq;
1700         int err;
1701
1702         if (!capable(CAP_NET_ADMIN))
1703                 return -EPERM;
1704
1705         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1706                 return -EFAULT;
1707
1708         rtnl_lock();
1709         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1710         rtnl_unlock();
1711         return err;
1712 }
1713
1714 static void sit_add_v4_addrs(struct inet6_dev *idev)
1715 {
1716         struct inet6_ifaddr * ifp;
1717         struct in6_addr addr;
1718         struct net_device *dev;
1719         int scope;
1720
1721         ASSERT_RTNL();
1722
1723         memset(&addr, 0, sizeof(struct in6_addr));
1724         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1725
1726         if (idev->dev->flags&IFF_POINTOPOINT) {
1727                 addr.s6_addr32[0] = htonl(0xfe800000);
1728                 scope = IFA_LINK;
1729         } else {
1730                 scope = IPV6_ADDR_COMPATv4;
1731         }
1732
1733         if (addr.s6_addr32[3]) {
1734                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1735                 if (!IS_ERR(ifp)) {
1736                         spin_lock_bh(&ifp->lock);
1737                         ifp->flags &= ~IFA_F_TENTATIVE;
1738                         spin_unlock_bh(&ifp->lock);
1739                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1740                         in6_ifa_put(ifp);
1741                 }
1742                 return;
1743         }
1744
1745         for (dev = dev_base; dev != NULL; dev = dev->next) {
1746                 struct in_device * in_dev = __in_dev_get(dev);
1747                 if (in_dev && (dev->flags & IFF_UP)) {
1748                         struct in_ifaddr * ifa;
1749
1750                         int flag = scope;
1751
1752                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1753                                 int plen;
1754
1755                                 addr.s6_addr32[3] = ifa->ifa_local;
1756
1757                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1758                                         continue;
1759                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1760                                         if (idev->dev->flags&IFF_POINTOPOINT)
1761                                                 continue;
1762                                         flag |= IFA_HOST;
1763                                 }
1764                                 if (idev->dev->flags&IFF_POINTOPOINT)
1765                                         plen = 64;
1766                                 else
1767                                         plen = 96;
1768
1769                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1770                                                     IFA_F_PERMANENT);
1771                                 if (!IS_ERR(ifp)) {
1772                                         spin_lock_bh(&ifp->lock);
1773                                         ifp->flags &= ~IFA_F_TENTATIVE;
1774                                         spin_unlock_bh(&ifp->lock);
1775                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1776                                         in6_ifa_put(ifp);
1777                                 }
1778                         }
1779                 }
1780         }
1781 }
1782
1783 static void init_loopback(struct net_device *dev)
1784 {
1785         struct inet6_dev  *idev;
1786         struct inet6_ifaddr * ifp;
1787
1788         /* ::1 */
1789
1790         ASSERT_RTNL();
1791
1792         if ((idev = ipv6_find_idev(dev)) == NULL) {
1793                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1794                 return;
1795         }
1796
1797         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1798         if (!IS_ERR(ifp)) {
1799                 spin_lock_bh(&ifp->lock);
1800                 ifp->flags &= ~IFA_F_TENTATIVE;
1801                 spin_unlock_bh(&ifp->lock);
1802                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1803                 in6_ifa_put(ifp);
1804         }
1805 }
1806
1807 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
1808 {
1809         struct inet6_ifaddr * ifp;
1810
1811         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
1812         if (!IS_ERR(ifp)) {
1813                 addrconf_dad_start(ifp, 0);
1814                 in6_ifa_put(ifp);
1815         }
1816 }
1817
1818 static void addrconf_dev_config(struct net_device *dev)
1819 {
1820         struct in6_addr addr;
1821         struct inet6_dev    * idev;
1822
1823         ASSERT_RTNL();
1824
1825         if ((dev->type != ARPHRD_ETHER) &&
1826             (dev->type != ARPHRD_FDDI) &&
1827             (dev->type != ARPHRD_IEEE802_TR) &&
1828             (dev->type != ARPHRD_ARCNET) &&
1829             (dev->type != ARPHRD_INFINIBAND)) {
1830                 /* Alas, we support only Ethernet autoconfiguration. */
1831                 return;
1832         }
1833
1834         idev = addrconf_add_dev(dev);
1835         if (idev == NULL)
1836                 return;
1837
1838         memset(&addr, 0, sizeof(struct in6_addr));
1839         addr.s6_addr32[0] = htonl(0xFE800000);
1840
1841         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
1842                 addrconf_add_linklocal(idev, &addr);
1843 }
1844
1845 static void addrconf_sit_config(struct net_device *dev)
1846 {
1847         struct inet6_dev *idev;
1848
1849         ASSERT_RTNL();
1850
1851         /*
1852          * Configure the tunnel with one of our IPv4
1853          * addresses... we should configure all of
1854          * our v4 addrs in the tunnel
1855          */
1856
1857         if ((idev = ipv6_find_idev(dev)) == NULL) {
1858                 printk(KERN_DEBUG "init sit: add_dev failed\n");
1859                 return;
1860         }
1861
1862         sit_add_v4_addrs(idev);
1863
1864         if (dev->flags&IFF_POINTOPOINT) {
1865                 addrconf_add_mroute(dev);
1866                 addrconf_add_lroute(dev);
1867         } else
1868                 sit_route_add(dev);
1869 }
1870
1871 static inline int
1872 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
1873 {
1874         struct in6_addr lladdr;
1875
1876         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
1877                 addrconf_add_linklocal(idev, &lladdr);
1878                 return 0;
1879         }
1880         return -1;
1881 }
1882
1883 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
1884 {
1885         struct net_device *link_dev;
1886
1887         /* first try to inherit the link-local address from the link device */
1888         if (idev->dev->iflink &&
1889             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
1890                 if (!ipv6_inherit_linklocal(idev, link_dev))
1891                         return;
1892         }
1893         /* then try to inherit it from any device */
1894         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
1895                 if (!ipv6_inherit_linklocal(idev, link_dev))
1896                         return;
1897         }
1898         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
1899 }
1900
1901 /*
1902  * Autoconfigure tunnel with a link-local address so routing protocols,
1903  * DHCPv6, MLD etc. can be run over the virtual link
1904  */
1905
1906 static void addrconf_ip6_tnl_config(struct net_device *dev)
1907 {
1908         struct inet6_dev *idev;
1909
1910         ASSERT_RTNL();
1911
1912         if ((idev = addrconf_add_dev(dev)) == NULL) {
1913                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
1914                 return;
1915         }
1916         ip6_tnl_add_linklocal(idev);
1917         addrconf_add_mroute(dev);
1918 }
1919
1920 static int addrconf_notify(struct notifier_block *this, unsigned long event,
1921                            void * data)
1922 {
1923         struct net_device *dev = (struct net_device *) data;
1924         struct inet6_dev *idev = __in6_dev_get(dev);
1925
1926         switch(event) {
1927         case NETDEV_UP:
1928                 switch(dev->type) {
1929                 case ARPHRD_SIT:
1930                         addrconf_sit_config(dev);
1931                         break;
1932                 case ARPHRD_TUNNEL6:
1933                         addrconf_ip6_tnl_config(dev);
1934                         break;
1935                 case ARPHRD_LOOPBACK:
1936                         init_loopback(dev);
1937                         break;
1938
1939                 default:
1940                         addrconf_dev_config(dev);
1941                         break;
1942                 };
1943                 if (idev) {
1944                         /* If the MTU changed during the interface down, when the
1945                            interface up, the changed MTU must be reflected in the
1946                            idev as well as routers.
1947                          */
1948                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
1949                                 rt6_mtu_change(dev, dev->mtu);
1950                                 idev->cnf.mtu6 = dev->mtu;
1951                         }
1952                         idev->tstamp = jiffies;
1953                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
1954                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
1955                            stop IPv6 on this interface.
1956                          */
1957                         if (dev->mtu < IPV6_MIN_MTU)
1958                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
1959                 }
1960                 break;
1961
1962         case NETDEV_CHANGEMTU:
1963                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
1964                         rt6_mtu_change(dev, dev->mtu);
1965                         idev->cnf.mtu6 = dev->mtu;
1966                         break;
1967                 }
1968
1969                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
1970
1971         case NETDEV_DOWN:
1972         case NETDEV_UNREGISTER:
1973                 /*
1974                  *      Remove all addresses from this interface.
1975                  */
1976                 addrconf_ifdown(dev, event != NETDEV_DOWN);
1977                 break;
1978         case NETDEV_CHANGE:
1979                 break;
1980         case NETDEV_CHANGENAME:
1981 #ifdef CONFIG_SYSCTL
1982                 if (idev) {
1983                         addrconf_sysctl_unregister(&idev->cnf);
1984                         neigh_sysctl_unregister(idev->nd_parms);
1985                         neigh_sysctl_register(dev, idev->nd_parms, NET_IPV6, NET_IPV6_NEIGH, "ipv6", &ndisc_ifinfo_sysctl_change);
1986                         addrconf_sysctl_register(idev, &idev->cnf);
1987                 }
1988 #endif
1989                 break;
1990         };
1991
1992         return NOTIFY_OK;
1993 }
1994
1995 /*
1996  *      addrconf module should be notified of a device going up
1997  */
1998 static struct notifier_block ipv6_dev_notf = {
1999         .notifier_call = addrconf_notify,
2000         .priority = 0
2001 };
2002
2003 static int addrconf_ifdown(struct net_device *dev, int how)
2004 {
2005         struct inet6_dev *idev;
2006         struct inet6_ifaddr *ifa, **bifa;
2007         int i;
2008
2009         ASSERT_RTNL();
2010
2011         rt6_ifdown(dev);
2012         neigh_ifdown(&nd_tbl, dev);
2013
2014         idev = __in6_dev_get(dev);
2015         if (idev == NULL)
2016                 return -ENODEV;
2017
2018         /* Step 1: remove reference to ipv6 device from parent device.
2019                    Do not dev_put!
2020          */
2021         if (how == 1) {
2022                 write_lock_bh(&addrconf_lock);
2023                 dev->ip6_ptr = NULL;
2024                 idev->dead = 1;
2025                 write_unlock_bh(&addrconf_lock);
2026
2027                 /* Step 1.5: remove snmp6 entry */
2028                 snmp6_unregister_dev(idev);
2029
2030         }
2031
2032         /* Step 2: clear hash table */
2033         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2034                 bifa = &inet6_addr_lst[i];
2035
2036                 write_lock_bh(&addrconf_hash_lock);
2037                 while ((ifa = *bifa) != NULL) {
2038                         if (ifa->idev == idev) {
2039                                 *bifa = ifa->lst_next;
2040                                 ifa->lst_next = NULL;
2041                                 addrconf_del_timer(ifa);
2042                                 in6_ifa_put(ifa);
2043                                 continue;
2044                         }
2045                         bifa = &ifa->lst_next;
2046                 }
2047                 write_unlock_bh(&addrconf_hash_lock);
2048         }
2049
2050         write_lock_bh(&idev->lock);
2051
2052         /* Step 3: clear flags for stateless addrconf */
2053         if (how != 1)
2054                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2055
2056         /* Step 4: clear address list */
2057 #ifdef CONFIG_IPV6_PRIVACY
2058         if (how == 1 && del_timer(&idev->regen_timer))
2059                 in6_dev_put(idev);
2060
2061         /* clear tempaddr list */
2062         while ((ifa = idev->tempaddr_list) != NULL) {
2063                 idev->tempaddr_list = ifa->tmp_next;
2064                 ifa->tmp_next = NULL;
2065                 ifa->dead = 1;
2066                 write_unlock_bh(&idev->lock);
2067                 spin_lock_bh(&ifa->lock);
2068
2069                 if (ifa->ifpub) {
2070                         in6_ifa_put(ifa->ifpub);
2071                         ifa->ifpub = NULL;
2072                 }
2073                 spin_unlock_bh(&ifa->lock);
2074                 in6_ifa_put(ifa);
2075                 write_lock_bh(&idev->lock);
2076         }
2077 #endif
2078         while ((ifa = idev->addr_list) != NULL) {
2079                 idev->addr_list = ifa->if_next;
2080                 ifa->if_next = NULL;
2081                 ifa->dead = 1;
2082                 addrconf_del_timer(ifa);
2083                 write_unlock_bh(&idev->lock);
2084
2085                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2086                 in6_ifa_put(ifa);
2087
2088                 write_lock_bh(&idev->lock);
2089         }
2090         write_unlock_bh(&idev->lock);
2091
2092         /* Step 5: Discard multicast list */
2093
2094         if (how == 1)
2095                 ipv6_mc_destroy_dev(idev);
2096         else
2097                 ipv6_mc_down(idev);
2098
2099         /* Step 5: netlink notification of this interface */
2100         idev->tstamp = jiffies;
2101         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2102
2103         /* Shot the device (if unregistered) */
2104
2105         if (how == 1) {
2106 #ifdef CONFIG_SYSCTL
2107                 addrconf_sysctl_unregister(&idev->cnf);
2108                 neigh_sysctl_unregister(idev->nd_parms);
2109 #endif
2110                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2111                 neigh_ifdown(&nd_tbl, dev);
2112                 in6_dev_put(idev);
2113         }
2114         return 0;
2115 }
2116
2117 static void addrconf_rs_timer(unsigned long data)
2118 {
2119         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2120
2121         if (ifp->idev->cnf.forwarding)
2122                 goto out;
2123
2124         if (ifp->idev->if_flags & IF_RA_RCVD) {
2125                 /*
2126                  *      Announcement received after solicitation
2127                  *      was sent
2128                  */
2129                 goto out;
2130         }
2131
2132         spin_lock(&ifp->lock);
2133         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2134                 struct in6_addr all_routers;
2135
2136                 /* The wait after the last probe can be shorter */
2137                 addrconf_mod_timer(ifp, AC_RS,
2138                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2139                                    ifp->idev->cnf.rtr_solicit_delay :
2140                                    ifp->idev->cnf.rtr_solicit_interval);
2141                 spin_unlock(&ifp->lock);
2142
2143                 ipv6_addr_all_routers(&all_routers);
2144
2145                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2146         } else {
2147                 spin_unlock(&ifp->lock);
2148                 /*
2149                  * Note: we do not support deprecated "all on-link"
2150                  * assumption any longer.
2151                  */
2152                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2153                        ifp->idev->dev->name);
2154         }
2155
2156 out:
2157         in6_ifa_put(ifp);
2158 }
2159
2160 /*
2161  *      Duplicate Address Detection
2162  */
2163 static void addrconf_dad_start(struct inet6_ifaddr *ifp, int flags)
2164 {
2165         struct inet6_dev *idev = ifp->idev;
2166         struct net_device *dev = idev->dev;
2167         unsigned long rand_num;
2168
2169         addrconf_join_solict(dev, &ifp->addr);
2170
2171         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2172                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2173                                         flags);
2174
2175         net_srandom(ifp->addr.s6_addr32[3]);
2176         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2177
2178         read_lock_bh(&idev->lock);
2179         if (ifp->dead)
2180                 goto out;
2181         spin_lock_bh(&ifp->lock);
2182
2183         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2184             !(ifp->flags&IFA_F_TENTATIVE)) {
2185                 ifp->flags &= ~IFA_F_TENTATIVE;
2186                 spin_unlock_bh(&ifp->lock);
2187                 read_unlock_bh(&idev->lock);
2188
2189                 addrconf_dad_completed(ifp);
2190                 return;
2191         }
2192
2193         ifp->probes = idev->cnf.dad_transmits;
2194         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2195
2196         spin_unlock_bh(&ifp->lock);
2197 out:
2198         read_unlock_bh(&idev->lock);
2199 }
2200
2201 static void addrconf_dad_timer(unsigned long data)
2202 {
2203         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2204         struct inet6_dev *idev = ifp->idev;
2205         struct in6_addr unspec;
2206         struct in6_addr mcaddr;
2207
2208         read_lock_bh(&idev->lock);
2209         if (idev->dead) {
2210                 read_unlock_bh(&idev->lock);
2211                 goto out;
2212         }
2213         spin_lock_bh(&ifp->lock);
2214         if (ifp->probes == 0) {
2215                 /*
2216                  * DAD was successful
2217                  */
2218
2219                 ifp->flags &= ~IFA_F_TENTATIVE;
2220                 spin_unlock_bh(&ifp->lock);
2221                 read_unlock_bh(&idev->lock);
2222
2223                 addrconf_dad_completed(ifp);
2224
2225                 goto out;
2226         }
2227
2228         ifp->probes--;
2229         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2230         spin_unlock_bh(&ifp->lock);
2231         read_unlock_bh(&idev->lock);
2232
2233         /* send a neighbour solicitation for our addr */
2234         memset(&unspec, 0, sizeof(unspec));
2235         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2236         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2237 out:
2238         in6_ifa_put(ifp);
2239 }
2240
2241 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2242 {
2243         struct net_device *     dev = ifp->idev->dev;
2244
2245         /*
2246          *      Configure the address for reception. Now it is valid.
2247          */
2248
2249         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2250
2251         /* If added prefix is link local and forwarding is off,
2252            start sending router solicitations.
2253          */
2254
2255         if (ifp->idev->cnf.forwarding == 0 &&
2256             ifp->idev->cnf.rtr_solicits > 0 &&
2257             (dev->flags&IFF_LOOPBACK) == 0 &&
2258             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2259                 struct in6_addr all_routers;
2260
2261                 ipv6_addr_all_routers(&all_routers);
2262
2263                 /*
2264                  *      If a host as already performed a random delay
2265                  *      [...] as part of DAD [...] there is no need
2266                  *      to delay again before sending the first RS
2267                  */
2268                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2269
2270                 spin_lock_bh(&ifp->lock);
2271                 ifp->probes = 1;
2272                 ifp->idev->if_flags |= IF_RS_SENT;
2273                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2274                 spin_unlock_bh(&ifp->lock);
2275         }
2276 }
2277
2278 #ifdef CONFIG_PROC_FS
2279 struct if6_iter_state {
2280         int bucket;
2281 };
2282
2283 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2284 {
2285         struct inet6_ifaddr *ifa = NULL;
2286         struct if6_iter_state *state = seq->private;
2287
2288         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2289                 ifa = inet6_addr_lst[state->bucket];
2290                 if (ifa)
2291                         break;
2292         }
2293         return ifa;
2294 }
2295
2296 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2297 {
2298         struct if6_iter_state *state = seq->private;
2299
2300         ifa = ifa->lst_next;
2301 try_again:
2302         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2303                 ifa = inet6_addr_lst[state->bucket];
2304                 goto try_again;
2305         }
2306         return ifa;
2307 }
2308
2309 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2310 {
2311         struct inet6_ifaddr *ifa = if6_get_first(seq);
2312
2313         if (ifa)
2314                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2315                         --pos;
2316         return pos ? NULL : ifa;
2317 }
2318
2319 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2320 {
2321         read_lock_bh(&addrconf_hash_lock);
2322         return if6_get_idx(seq, *pos);
2323 }
2324
2325 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2326 {
2327         struct inet6_ifaddr *ifa;
2328
2329         ifa = if6_get_next(seq, v);
2330         ++*pos;
2331         return ifa;
2332 }
2333
2334 static void if6_seq_stop(struct seq_file *seq, void *v)
2335 {
2336         read_unlock_bh(&addrconf_hash_lock);
2337 }
2338
2339 static int if6_seq_show(struct seq_file *seq, void *v)
2340 {
2341         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2342
2343         /* no ipv6 inside a vserver for now */
2344         if (vx_check(0, VX_ADMIN|VX_WATCH))
2345                 seq_printf(seq,
2346                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2347                    NIP6(ifp->addr),
2348                    ifp->idev->dev->ifindex,
2349                    ifp->prefix_len,
2350                    ifp->scope,
2351                    ifp->flags,
2352                    ifp->idev->dev->name);
2353         return 0;
2354 }
2355
2356 static struct seq_operations if6_seq_ops = {
2357         .start  = if6_seq_start,
2358         .next   = if6_seq_next,
2359         .show   = if6_seq_show,
2360         .stop   = if6_seq_stop,
2361 };
2362
2363 static int if6_seq_open(struct inode *inode, struct file *file)
2364 {
2365         struct seq_file *seq;
2366         int rc = -ENOMEM;
2367         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2368
2369         if (!s)
2370                 goto out;
2371         memset(s, 0, sizeof(*s));
2372
2373         rc = seq_open(file, &if6_seq_ops);
2374         if (rc)
2375                 goto out_kfree;
2376
2377         seq = file->private_data;
2378         seq->private = s;
2379 out:
2380         return rc;
2381 out_kfree:
2382         kfree(s);
2383         goto out;
2384 }
2385
2386 static struct file_operations if6_fops = {
2387         .owner          = THIS_MODULE,
2388         .open           = if6_seq_open,
2389         .read           = seq_read,
2390         .llseek         = seq_lseek,
2391         .release        = seq_release_private,
2392 };
2393
2394 int __init if6_proc_init(void)
2395 {
2396         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2397                 return -ENOMEM;
2398         return 0;
2399 }
2400
2401 void if6_proc_exit(void)
2402 {
2403         proc_net_remove("if_inet6");
2404 }
2405 #endif  /* CONFIG_PROC_FS */
2406
2407 /*
2408  *      Periodic address status verification
2409  */
2410
2411 static void addrconf_verify(unsigned long foo)
2412 {
2413         struct inet6_ifaddr *ifp;
2414         unsigned long now, next;
2415         int i;
2416
2417         spin_lock_bh(&addrconf_verify_lock);
2418         now = jiffies;
2419         next = now + ADDR_CHECK_FREQUENCY;
2420
2421         del_timer(&addr_chk_timer);
2422
2423         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2424
2425 restart:
2426                 write_lock(&addrconf_hash_lock);
2427                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2428                         unsigned long age;
2429 #ifdef CONFIG_IPV6_PRIVACY
2430                         unsigned long regen_advance;
2431 #endif
2432
2433                         if (ifp->flags & IFA_F_PERMANENT)
2434                                 continue;
2435
2436                         spin_lock(&ifp->lock);
2437                         age = (now - ifp->tstamp) / HZ;
2438
2439 #ifdef CONFIG_IPV6_PRIVACY
2440                         regen_advance = ifp->idev->cnf.regen_max_retry *
2441                                         ifp->idev->cnf.dad_transmits *
2442                                         ifp->idev->nd_parms->retrans_time / HZ;
2443 #endif
2444
2445                         if (age >= ifp->valid_lft) {
2446                                 spin_unlock(&ifp->lock);
2447                                 in6_ifa_hold(ifp);
2448                                 write_unlock(&addrconf_hash_lock);
2449                                 ipv6_del_addr(ifp);
2450                                 goto restart;
2451                         } else if (age >= ifp->prefered_lft) {
2452                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2453                                 int deprecate = 0;
2454
2455                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2456                                         deprecate = 1;
2457                                         ifp->flags |= IFA_F_DEPRECATED;
2458                                 }
2459
2460                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2461                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2462
2463                                 spin_unlock(&ifp->lock);
2464
2465                                 if (deprecate) {
2466                                         in6_ifa_hold(ifp);
2467                                         write_unlock(&addrconf_hash_lock);
2468
2469                                         ipv6_ifa_notify(0, ifp);
2470                                         in6_ifa_put(ifp);
2471                                         goto restart;
2472                                 }
2473 #ifdef CONFIG_IPV6_PRIVACY
2474                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2475                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2476                                 if (age >= ifp->prefered_lft - regen_advance) {
2477                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2478                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2479                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2480                                         if (!ifp->regen_count && ifpub) {
2481                                                 ifp->regen_count++;
2482                                                 in6_ifa_hold(ifp);
2483                                                 in6_ifa_hold(ifpub);
2484                                                 spin_unlock(&ifp->lock);
2485                                                 write_unlock(&addrconf_hash_lock);
2486                                                 ipv6_create_tempaddr(ifpub, ifp);
2487                                                 in6_ifa_put(ifpub);
2488                                                 in6_ifa_put(ifp);
2489                                                 goto restart;
2490                                         }
2491                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2492                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2493                                 spin_unlock(&ifp->lock);
2494 #endif
2495                         } else {
2496                                 /* ifp->prefered_lft <= ifp->valid_lft */
2497                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2498                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2499                                 spin_unlock(&ifp->lock);
2500                         }
2501                 }
2502                 write_unlock(&addrconf_hash_lock);
2503         }
2504
2505         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2506         add_timer(&addr_chk_timer);
2507         spin_unlock_bh(&addrconf_verify_lock);
2508 }
2509
2510 static int
2511 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2512 {
2513         struct rtattr **rta = arg;
2514         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2515         struct in6_addr *pfx;
2516
2517         pfx = NULL;
2518         if (rta[IFA_ADDRESS-1]) {
2519                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2520                         return -EINVAL;
2521                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2522         }
2523         if (rta[IFA_LOCAL-1]) {
2524                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2525                         return -EINVAL;
2526                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2527         }
2528         if (pfx == NULL)
2529                 return -EINVAL;
2530
2531         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2532 }
2533
2534 static int
2535 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2536 {
2537         struct rtattr  **rta = arg;
2538         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2539         struct in6_addr *pfx;
2540
2541         pfx = NULL;
2542         if (rta[IFA_ADDRESS-1]) {
2543                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2544                         return -EINVAL;
2545                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2546         }
2547         if (rta[IFA_LOCAL-1]) {
2548                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2549                         return -EINVAL;
2550                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2551         }
2552         if (pfx == NULL)
2553                 return -EINVAL;
2554
2555         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2556 }
2557
2558 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2559                              u32 pid, u32 seq, int event)
2560 {
2561         struct ifaddrmsg *ifm;
2562         struct nlmsghdr  *nlh;
2563         struct ifa_cacheinfo ci;
2564         unsigned char    *b = skb->tail;
2565
2566         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
2567         if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2568         ifm = NLMSG_DATA(nlh);
2569         ifm->ifa_family = AF_INET6;
2570         ifm->ifa_prefixlen = ifa->prefix_len;
2571         ifm->ifa_flags = ifa->flags;
2572         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2573         if (ifa->scope&IFA_HOST)
2574                 ifm->ifa_scope = RT_SCOPE_HOST;
2575         else if (ifa->scope&IFA_LINK)
2576                 ifm->ifa_scope = RT_SCOPE_LINK;
2577         else if (ifa->scope&IFA_SITE)
2578                 ifm->ifa_scope = RT_SCOPE_SITE;
2579         ifm->ifa_index = ifa->idev->dev->ifindex;
2580         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2581         if (!(ifa->flags&IFA_F_PERMANENT)) {
2582                 ci.ifa_prefered = ifa->prefered_lft;
2583                 ci.ifa_valid = ifa->valid_lft;
2584                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2585                         long tval = (jiffies - ifa->tstamp)/HZ;
2586                         ci.ifa_prefered -= tval;
2587                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2588                                 ci.ifa_valid -= tval;
2589                 }
2590         } else {
2591                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2592                 ci.ifa_valid = INFINITY_LIFE_TIME;
2593         }
2594         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2595                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2596         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2597                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2598         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2599         nlh->nlmsg_len = skb->tail - b;
2600         return skb->len;
2601
2602 nlmsg_failure:
2603 rtattr_failure:
2604         skb_trim(skb, b - skb->data);
2605         return -1;
2606 }
2607
2608 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2609                                 u32 pid, u32 seq, int event)
2610 {
2611         struct ifaddrmsg *ifm;
2612         struct nlmsghdr  *nlh;
2613         struct ifa_cacheinfo ci;
2614         unsigned char    *b = skb->tail;
2615
2616         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
2617         if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2618         ifm = NLMSG_DATA(nlh);
2619         ifm->ifa_family = AF_INET6;
2620         ifm->ifa_prefixlen = 128;
2621         ifm->ifa_flags = IFA_F_PERMANENT;
2622         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2623         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2624                 ifm->ifa_scope = RT_SCOPE_SITE;
2625         ifm->ifa_index = ifmca->idev->dev->ifindex;
2626         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2627         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2628                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2629                     * 100 / HZ);
2630         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2631                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2632                     * 100 / HZ);
2633         ci.ifa_prefered = INFINITY_LIFE_TIME;
2634         ci.ifa_valid = INFINITY_LIFE_TIME;
2635         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2636         nlh->nlmsg_len = skb->tail - b;
2637         return skb->len;
2638
2639 nlmsg_failure:
2640 rtattr_failure:
2641         skb_trim(skb, b - skb->data);
2642         return -1;
2643 }
2644
2645 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2646                                 u32 pid, u32 seq, int event)
2647 {
2648         struct ifaddrmsg *ifm;
2649         struct nlmsghdr  *nlh;
2650         struct ifa_cacheinfo ci;
2651         unsigned char    *b = skb->tail;
2652
2653         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
2654         if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2655         ifm = NLMSG_DATA(nlh);
2656         ifm->ifa_family = AF_INET6;
2657         ifm->ifa_prefixlen = 128;
2658         ifm->ifa_flags = IFA_F_PERMANENT;
2659         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2660         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2661                 ifm->ifa_scope = RT_SCOPE_SITE;
2662         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2663         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2664         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2665                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2666                     * 100 / HZ);
2667         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2668                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2669                     * 100 / HZ);
2670         ci.ifa_prefered = INFINITY_LIFE_TIME;
2671         ci.ifa_valid = INFINITY_LIFE_TIME;
2672         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2673         nlh->nlmsg_len = skb->tail - b;
2674         return skb->len;
2675
2676 nlmsg_failure:
2677 rtattr_failure:
2678         skb_trim(skb, b - skb->data);
2679         return -1;
2680 }
2681
2682 enum addr_type_t
2683 {
2684         UNICAST_ADDR,
2685         MULTICAST_ADDR,
2686         ANYCAST_ADDR,
2687 };
2688
2689 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2690                            enum addr_type_t type)
2691 {
2692         int idx, ip_idx;
2693         int s_idx, s_ip_idx;
2694         int err = 1;
2695         struct net_device *dev;
2696         struct inet6_dev *idev = NULL;
2697         struct inet6_ifaddr *ifa;
2698         struct ifmcaddr6 *ifmca;
2699         struct ifacaddr6 *ifaca;
2700
2701         /* no ipv6 inside a vserver for now */
2702         if (skb->sk && skb->sk->sk_vx_info)
2703                 return skb->len;
2704
2705         s_idx = cb->args[0];
2706         s_ip_idx = ip_idx = cb->args[1];
2707         read_lock(&dev_base_lock);
2708
2709         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2710                 if (idx < s_idx)
2711                         continue;
2712                 if (idx > s_idx)
2713                         s_ip_idx = 0;
2714                 ip_idx = 0;
2715                 if ((idev = in6_dev_get(dev)) == NULL)
2716                         continue;
2717                 read_lock_bh(&idev->lock);
2718                 switch (type) {
2719                 case UNICAST_ADDR:
2720                         /* unicast address */
2721                         for (ifa = idev->addr_list; ifa;
2722                              ifa = ifa->if_next, ip_idx++) {
2723                                 if (ip_idx < s_ip_idx)
2724                                         continue;
2725                                 if ((err = inet6_fill_ifaddr(skb, ifa,
2726                                     NETLINK_CB(cb->skb).pid,
2727                                     cb->nlh->nlmsg_seq, RTM_NEWADDR)) <= 0)
2728                                         goto done;
2729                         }
2730                         /* temp addr */
2731 #ifdef CONFIG_IPV6_PRIVACY
2732                         for (ifa = idev->tempaddr_list; ifa;
2733                              ifa = ifa->tmp_next, ip_idx++) {
2734                                 if (ip_idx < s_ip_idx)
2735                                         continue;
2736                                 if ((err = inet6_fill_ifaddr(skb, ifa,
2737                                     NETLINK_CB(cb->skb).pid,
2738                                     cb->nlh->nlmsg_seq, RTM_NEWADDR)) <= 0)
2739                                         goto done;
2740                         }
2741 #endif
2742                         break;
2743                 case MULTICAST_ADDR:
2744                         /* multicast address */
2745                         for (ifmca = idev->mc_list; ifmca;
2746                              ifmca = ifmca->next, ip_idx++) {
2747                                 if (ip_idx < s_ip_idx)
2748                                         continue;
2749                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2750                                     NETLINK_CB(cb->skb).pid,
2751                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST)) <= 0)
2752                                         goto done;
2753                         }
2754                         break;
2755                 case ANYCAST_ADDR:
2756                         /* anycast address */
2757                         for (ifaca = idev->ac_list; ifaca;
2758                              ifaca = ifaca->aca_next, ip_idx++) {
2759                                 if (ip_idx < s_ip_idx)
2760                                         continue;
2761                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2762                                     NETLINK_CB(cb->skb).pid,
2763                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST)) <= 0)
2764                                         goto done;
2765                         }
2766                         break;
2767                 default:
2768                         break;
2769                 }
2770                 read_unlock_bh(&idev->lock);
2771                 in6_dev_put(idev);
2772         }
2773 done:
2774         if (err <= 0) {
2775                 read_unlock_bh(&idev->lock);
2776                 in6_dev_put(idev);
2777         }
2778         read_unlock(&dev_base_lock);
2779         cb->args[0] = idx;
2780         cb->args[1] = ip_idx;
2781         return skb->len;
2782 }
2783
2784 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2785 {
2786         enum addr_type_t type = UNICAST_ADDR;
2787         return inet6_dump_addr(skb, cb, type);
2788 }
2789
2790 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2791 {
2792         enum addr_type_t type = MULTICAST_ADDR;
2793         return inet6_dump_addr(skb, cb, type);
2794 }
2795
2796
2797 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2798 {
2799         enum addr_type_t type = ANYCAST_ADDR;
2800         return inet6_dump_addr(skb, cb, type);
2801 }
2802
2803 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2804 {
2805         struct sk_buff *skb;
2806         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2807
2808         skb = alloc_skb(size, GFP_ATOMIC);
2809         if (!skb) {
2810                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, ENOBUFS);
2811                 return;
2812         }
2813         if (inet6_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
2814                 kfree_skb(skb);
2815                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, EINVAL);
2816                 return;
2817         }
2818         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFADDR;
2819         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFADDR, GFP_ATOMIC);
2820 }
2821
2822 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
2823                                 __s32 *array, int bytes)
2824 {
2825         memset(array, 0, bytes);
2826         array[DEVCONF_FORWARDING] = cnf->forwarding;
2827         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
2828         array[DEVCONF_MTU6] = cnf->mtu6;
2829         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
2830         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
2831         array[DEVCONF_AUTOCONF] = cnf->autoconf;
2832         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
2833         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
2834         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
2835         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
2836         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
2837 #ifdef CONFIG_IPV6_PRIVACY
2838         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
2839         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
2840         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
2841         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
2842         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
2843 #endif
2844         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
2845 }
2846
2847 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
2848                              u32 pid, u32 seq, int event)
2849 {
2850         struct net_device       *dev = idev->dev;
2851         __s32                   *array = NULL;
2852         struct ifinfomsg        *r;
2853         struct nlmsghdr         *nlh;
2854         unsigned char           *b = skb->tail;
2855         struct rtattr           *subattr;
2856         __u32                   mtu = dev->mtu;
2857         struct ifla_cacheinfo   ci;
2858
2859         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*r));
2860         if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2861         r = NLMSG_DATA(nlh);
2862         r->ifi_family = AF_INET6;
2863         r->ifi_type = dev->type;
2864         r->ifi_index = dev->ifindex;
2865         r->ifi_flags = dev->flags;
2866         r->ifi_change = 0;
2867         if (!netif_running(dev) || !netif_carrier_ok(dev))
2868                 r->ifi_flags &= ~IFF_RUNNING;
2869         else
2870                 r->ifi_flags |= IFF_RUNNING;
2871
2872         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
2873
2874         if (dev->addr_len)
2875                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
2876
2877         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
2878         if (dev->ifindex != dev->iflink)
2879                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
2880
2881         subattr = (struct rtattr*)skb->tail;
2882
2883         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
2884
2885         /* return the device flags */
2886         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
2887
2888         /* return interface cacheinfo */
2889         ci.max_reasm_len = IPV6_MAXPLEN;
2890         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
2891                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2892         ci.reachable_time = idev->nd_parms->reachable_time;
2893         ci.retrans_time = idev->nd_parms->retrans_time;
2894         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
2895
2896         /* return the device sysctl params */
2897         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
2898                 goto rtattr_failure;
2899         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
2900         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
2901
2902         /* XXX - Statistics/MC not implemented */
2903         subattr->rta_len = skb->tail - (u8*)subattr;
2904
2905         nlh->nlmsg_len = skb->tail - b;
2906         kfree(array);
2907         return skb->len;
2908
2909 nlmsg_failure:
2910 rtattr_failure:
2911         if (array)
2912                 kfree(array);
2913         skb_trim(skb, b - skb->data);
2914         return -1;
2915 }
2916
2917 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2918 {
2919         int idx, err;
2920         int s_idx = cb->args[0];
2921         struct net_device *dev;
2922         struct inet6_dev *idev;
2923
2924         /* no ipv6 inside a vserver for now */
2925         if (skb->sk && skb->sk->sk_vx_info)
2926                 return skb->len;
2927
2928         read_lock(&dev_base_lock);
2929         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
2930                 if (idx < s_idx)
2931                         continue;
2932                 if ((idev = in6_dev_get(dev)) == NULL)
2933                         continue;
2934                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
2935                                 cb->nlh->nlmsg_seq, RTM_NEWLINK);
2936                 in6_dev_put(idev);
2937                 if (err <= 0)
2938                         break;
2939         }
2940         read_unlock(&dev_base_lock);
2941         cb->args[0] = idx;
2942
2943         return skb->len;
2944 }
2945
2946 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
2947 {
2948         struct sk_buff *skb;
2949         /* 128 bytes ?? */
2950         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
2951
2952         skb = alloc_skb(size, GFP_ATOMIC);
2953         if (!skb) {
2954                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, ENOBUFS);
2955                 return;
2956         }
2957         if (inet6_fill_ifinfo(skb, idev, 0, 0, event) < 0) {
2958                 kfree_skb(skb);
2959                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, EINVAL);
2960                 return;
2961         }
2962         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFINFO;
2963         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFINFO, GFP_ATOMIC);
2964 }
2965
2966 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
2967                         struct prefix_info *pinfo, u32 pid, u32 seq, int event)
2968 {
2969         struct prefixmsg        *pmsg;
2970         struct nlmsghdr         *nlh;
2971         unsigned char           *b = skb->tail;
2972         struct prefix_cacheinfo ci;
2973
2974         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*pmsg));
2975
2976         if (pid)
2977                 nlh->nlmsg_flags |= NLM_F_MULTI;
2978
2979         pmsg = NLMSG_DATA(nlh);
2980         pmsg->prefix_family = AF_INET6;
2981         pmsg->prefix_ifindex = idev->dev->ifindex;
2982         pmsg->prefix_len = pinfo->prefix_len;
2983         pmsg->prefix_type = pinfo->type;
2984
2985         pmsg->prefix_flags = 0;
2986         if (pinfo->onlink)
2987                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
2988         if (pinfo->autoconf)
2989                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
2990
2991         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
2992
2993         ci.preferred_time = ntohl(pinfo->prefered);
2994         ci.valid_time = ntohl(pinfo->valid);
2995         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
2996
2997         nlh->nlmsg_len = skb->tail - b;
2998         return skb->len;
2999
3000 nlmsg_failure:
3001 rtattr_failure:
3002         skb_trim(skb, b - skb->data);
3003         return -1;
3004 }
3005
3006 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3007                          struct prefix_info *pinfo)
3008 {
3009         struct sk_buff *skb;
3010         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3011
3012         skb = alloc_skb(size, GFP_ATOMIC);
3013         if (!skb) {
3014                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, ENOBUFS);
3015                 return;
3016         }
3017         if (inet6_fill_prefix(skb, idev, pinfo, 0, 0, event) < 0) {
3018                 kfree_skb(skb);
3019                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, EINVAL);
3020                 return;
3021         }
3022         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_PREFIX;
3023         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_PREFIX, GFP_ATOMIC);
3024 }
3025
3026 static struct rtnetlink_link inet6_rtnetlink_table[RTM_MAX - RTM_BASE + 1] = {
3027         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3028         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3029         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3030         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3031         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3032         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3033         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3034         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3035         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3036                                       .dumpit   = inet6_dump_fib, },
3037 };
3038
3039 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3040 {
3041         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3042
3043         switch (event) {
3044         case RTM_NEWADDR:
3045                 dst_hold(&ifp->rt->u.dst);
3046                 if (ip6_ins_rt(ifp->rt, NULL, NULL))
3047                         dst_release(&ifp->rt->u.dst);
3048                 if (ifp->idev->cnf.forwarding)
3049                         addrconf_join_anycast(ifp);
3050                 break;
3051         case RTM_DELADDR:
3052                 if (ifp->idev->cnf.forwarding)
3053                         addrconf_leave_anycast(ifp);
3054                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3055                 dst_hold(&ifp->rt->u.dst);
3056                 if (ip6_del_rt(ifp->rt, NULL, NULL))
3057                         dst_free(&ifp->rt->u.dst);
3058                 else
3059                         dst_release(&ifp->rt->u.dst);
3060                 break;
3061         }
3062 }
3063
3064 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3065 {
3066         read_lock_bh(&addrconf_lock);
3067         if (likely(ifp->idev->dead == 0))
3068                 __ipv6_ifa_notify(event, ifp);
3069         read_unlock_bh(&addrconf_lock);
3070 }
3071
3072 #ifdef CONFIG_SYSCTL
3073
3074 static
3075 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3076                            void __user *buffer, size_t *lenp, loff_t *ppos)
3077 {
3078         int *valp = ctl->data;
3079         int val = *valp;
3080         int ret;
3081
3082         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3083
3084         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3085                 if (valp != &ipv6_devconf.forwarding) {
3086                         if ((!*valp) ^ (!val)) {
3087                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3088                                 if (idev == NULL)
3089                                         return ret;
3090                                 dev_forward_change(idev);
3091                         }
3092                 } else {
3093                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3094                         addrconf_forward_change();
3095                 }
3096                 if (*valp)
3097                         rt6_purge_dflt_routers();
3098         }
3099
3100         return ret;
3101 }
3102
3103 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3104                                             int __user *name, int nlen,
3105                                             void __user *oldval,
3106                                             size_t __user *oldlenp,
3107                                             void __user *newval, size_t newlen,
3108                                             void **context)
3109 {
3110         int *valp = table->data;
3111         int new;
3112
3113         if (!newval || !newlen)
3114                 return 0;
3115         if (newlen != sizeof(int))
3116                 return -EINVAL;
3117         if (get_user(new, (int __user *)newval))
3118                 return -EFAULT;
3119         if (new == *valp)
3120                 return 0;
3121         if (oldval && oldlenp) {
3122                 size_t len;
3123                 if (get_user(len, oldlenp))
3124                         return -EFAULT;
3125                 if (len) {
3126                         if (len > table->maxlen)
3127                                 len = table->maxlen;
3128                         if (copy_to_user(oldval, valp, len))
3129                                 return -EFAULT;
3130                         if (put_user(len, oldlenp))
3131                                 return -EFAULT;
3132                 }
3133         }
3134
3135         if (valp != &ipv6_devconf_dflt.forwarding) {
3136                 if (valp != &ipv6_devconf.forwarding) {
3137                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3138                         int changed;
3139                         if (unlikely(idev == NULL))
3140                                 return -ENODEV;
3141                         changed = (!*valp) ^ (!new);
3142                         *valp = new;
3143                         if (changed)
3144                                 dev_forward_change(idev);
3145                 } else {
3146                         *valp = new;
3147                         addrconf_forward_change();
3148                 }
3149
3150                 if (*valp)
3151                         rt6_purge_dflt_routers();
3152         } else
3153                 *valp = new;
3154
3155         return 1;
3156 }
3157
3158 static struct addrconf_sysctl_table
3159 {
3160         struct ctl_table_header *sysctl_header;
3161         ctl_table addrconf_vars[18];
3162         ctl_table addrconf_dev[2];
3163         ctl_table addrconf_conf_dir[2];
3164         ctl_table addrconf_proto_dir[2];
3165         ctl_table addrconf_root_dir[2];
3166 } addrconf_sysctl = {
3167         .sysctl_header = NULL,
3168         .addrconf_vars = {
3169                 {
3170                         .ctl_name       =       NET_IPV6_FORWARDING,
3171                         .procname       =       "forwarding",
3172                         .data           =       &ipv6_devconf.forwarding,
3173                         .maxlen         =       sizeof(int),
3174                         .mode           =       0644,
3175                         .proc_handler   =       &addrconf_sysctl_forward,
3176                         .strategy       =       &addrconf_sysctl_forward_strategy,
3177                 },
3178                 {
3179                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3180                         .procname       =       "hop_limit",
3181                         .data           =       &ipv6_devconf.hop_limit,
3182                         .maxlen         =       sizeof(int),
3183                         .mode           =       0644,
3184                         .proc_handler   =       proc_dointvec,
3185                 },
3186                 {
3187                         .ctl_name       =       NET_IPV6_MTU,
3188                         .procname       =       "mtu",
3189                         .data           =       &ipv6_devconf.mtu6,
3190                         .maxlen         =       sizeof(int),
3191                         .mode           =       0644,
3192                         .proc_handler   =       &proc_dointvec,
3193                 },
3194                 {
3195                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3196                         .procname       =       "accept_ra",
3197                         .data           =       &ipv6_devconf.accept_ra,
3198                         .maxlen         =       sizeof(int),
3199                         .mode           =       0644,
3200                         .proc_handler   =       &proc_dointvec,
3201                 },
3202                 {
3203                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3204                         .procname       =       "accept_redirects",
3205                         .data           =       &ipv6_devconf.accept_redirects,
3206                         .maxlen         =       sizeof(int),
3207                         .mode           =       0644,
3208                         .proc_handler   =       &proc_dointvec,
3209                 },
3210                 {
3211                         .ctl_name       =       NET_IPV6_AUTOCONF,
3212                         .procname       =       "autoconf",
3213                         .data           =       &ipv6_devconf.autoconf,
3214                         .maxlen         =       sizeof(int),
3215                         .mode           =       0644,
3216                         .proc_handler   =       &proc_dointvec,
3217                 },
3218                 {
3219                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3220                         .procname       =       "dad_transmits",
3221                         .data           =       &ipv6_devconf.dad_transmits,
3222                         .maxlen         =       sizeof(int),
3223                         .mode           =       0644,
3224                         .proc_handler   =       &proc_dointvec,
3225                 },
3226                 {
3227                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3228                         .procname       =       "router_solicitations",
3229                         .data           =       &ipv6_devconf.rtr_solicits,
3230                         .maxlen         =       sizeof(int),
3231                         .mode           =       0644,
3232                         .proc_handler   =       &proc_dointvec,
3233                 },
3234                 {
3235                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3236                         .procname       =       "router_solicitation_interval",
3237                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3238                         .maxlen         =       sizeof(int),
3239                         .mode           =       0644,
3240                         .proc_handler   =       &proc_dointvec_jiffies,
3241                         .strategy       =       &sysctl_jiffies,
3242                 },
3243                 {
3244                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3245                         .procname       =       "router_solicitation_delay",
3246                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3247                         .maxlen         =       sizeof(int),
3248                         .mode           =       0644,
3249                         .proc_handler   =       &proc_dointvec_jiffies,
3250                         .strategy       =       &sysctl_jiffies,
3251                 },
3252                 {
3253                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3254                         .procname       =       "force_mld_version",
3255                         .data           =       &ipv6_devconf.force_mld_version,
3256                         .maxlen         =       sizeof(int),
3257                         .mode           =       0644,
3258                         .proc_handler   =       &proc_dointvec,
3259                 },
3260 #ifdef CONFIG_IPV6_PRIVACY
3261                 {
3262                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3263                         .procname       =       "use_tempaddr",
3264                         .data           =       &ipv6_devconf.use_tempaddr,
3265                         .maxlen         =       sizeof(int),
3266                         .mode           =       0644,
3267                         .proc_handler   =       &proc_dointvec,
3268                 },
3269                 {
3270                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3271                         .procname       =       "temp_valid_lft",
3272                         .data           =       &ipv6_devconf.temp_valid_lft,
3273                         .maxlen         =       sizeof(int),
3274                         .mode           =       0644,
3275                         .proc_handler   =       &proc_dointvec,
3276                 },
3277                 {
3278                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3279                         .procname       =       "temp_prefered_lft",
3280                         .data           =       &ipv6_devconf.temp_prefered_lft,
3281                         .maxlen         =       sizeof(int),
3282                         .mode           =       0644,
3283                         .proc_handler   =       &proc_dointvec,
3284                 },
3285                 {
3286                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3287                         .procname       =       "regen_max_retry",
3288                         .data           =       &ipv6_devconf.regen_max_retry,
3289                         .maxlen         =       sizeof(int),
3290                         .mode           =       0644,
3291                         .proc_handler   =       &proc_dointvec,
3292                 },
3293                 {
3294                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3295                         .procname       =       "max_desync_factor",
3296                         .data           =       &ipv6_devconf.max_desync_factor,
3297                         .maxlen         =       sizeof(int),
3298                         .mode           =       0644,
3299                         .proc_handler   =       &proc_dointvec,
3300                 },
3301 #endif
3302                 {
3303                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3304                         .procname       =       "max_addresses",
3305                         .data           =       &ipv6_devconf.max_addresses,
3306                         .maxlen         =       sizeof(int),
3307                         .mode           =       0644,
3308                         .proc_handler   =       &proc_dointvec,
3309                 },
3310                 {
3311                         .ctl_name       =       0,      /* sentinel */
3312                 }
3313         },
3314         .addrconf_dev = {
3315                 {
3316                         .ctl_name       =       NET_PROTO_CONF_ALL,
3317                         .procname       =       "all",
3318                         .mode           =       0555,
3319                         .child          =       addrconf_sysctl.addrconf_vars,
3320                 },
3321                 {
3322                         .ctl_name       =       0,      /* sentinel */
3323                 }
3324         },
3325         .addrconf_conf_dir = {
3326                 {
3327                         .ctl_name       =       NET_IPV6_CONF,
3328                         .procname       =       "conf",
3329                         .mode           =       0555,
3330                         .child          =       addrconf_sysctl.addrconf_dev,
3331                 },
3332                 {
3333                         .ctl_name       =       0,      /* sentinel */
3334                 }
3335         },
3336         .addrconf_proto_dir = {
3337                 {
3338                         .ctl_name       =       NET_IPV6,
3339                         .procname       =       "ipv6",
3340                         .mode           =       0555,
3341                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3342                 },
3343                 {
3344                         .ctl_name       =       0,      /* sentinel */
3345                 }
3346         },
3347         .addrconf_root_dir = {
3348                 {
3349                         .ctl_name       =       CTL_NET,
3350                         .procname       =       "net",
3351                         .mode           =       0555,
3352                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3353                 },
3354                 {
3355                         .ctl_name       =       0,      /* sentinel */
3356                 }
3357         },
3358 };
3359
3360 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3361 {
3362         int i;
3363         struct net_device *dev = idev ? idev->dev : NULL;
3364         struct addrconf_sysctl_table *t;
3365         char *dev_name = NULL;
3366
3367         t = kmalloc(sizeof(*t), GFP_KERNEL);
3368         if (t == NULL)
3369                 return;
3370         memcpy(t, &addrconf_sysctl, sizeof(*t));
3371         for (i=0; t->addrconf_vars[i].data; i++) {
3372                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3373                 t->addrconf_vars[i].de = NULL;
3374                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3375         }
3376         if (dev) {
3377                 dev_name = dev->name;
3378                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3379         } else {
3380                 dev_name = "default";
3381                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3382         }
3383
3384         /*
3385          * Make a copy of dev_name, because '.procname' is regarded as const
3386          * by sysctl and we wouldn't want anyone to change it under our feet
3387          * (see SIOCSIFNAME).
3388          */
3389         dev_name = net_sysctl_strdup(dev_name);
3390         if (!dev_name)
3391             goto free;
3392
3393         t->addrconf_dev[0].procname = dev_name;
3394
3395         t->addrconf_dev[0].child = t->addrconf_vars;
3396         t->addrconf_dev[0].de = NULL;
3397         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3398         t->addrconf_conf_dir[0].de = NULL;
3399         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3400         t->addrconf_proto_dir[0].de = NULL;
3401         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3402         t->addrconf_root_dir[0].de = NULL;
3403
3404         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3405         if (t->sysctl_header == NULL)
3406                 goto free_procname;
3407         else
3408                 p->sysctl = t;
3409         return;
3410
3411         /* error path */
3412  free_procname:
3413         kfree(dev_name);
3414  free:
3415         kfree(t);
3416
3417         return;
3418 }
3419
3420 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3421 {
3422         if (p->sysctl) {
3423                 struct addrconf_sysctl_table *t = p->sysctl;
3424                 p->sysctl = NULL;
3425                 unregister_sysctl_table(t->sysctl_header);
3426                 kfree(t->addrconf_dev[0].procname);
3427                 kfree(t);
3428         }
3429 }
3430
3431
3432 #endif
3433
3434 /*
3435  *      Device notifier
3436  */
3437
3438 int register_inet6addr_notifier(struct notifier_block *nb)
3439 {
3440         return notifier_chain_register(&inet6addr_chain, nb);
3441 }
3442
3443 int unregister_inet6addr_notifier(struct notifier_block *nb)
3444 {
3445         return notifier_chain_unregister(&inet6addr_chain,nb);
3446 }
3447
3448 /*
3449  *      Init / cleanup code
3450  */
3451
3452 void __init addrconf_init(void)
3453 {
3454         /* The addrconf netdev notifier requires that loopback_dev
3455          * has it's ipv6 private information allocated and setup
3456          * before it can bring up and give link-local addresses
3457          * to other devices which are up.
3458          *
3459          * Unfortunately, loopback_dev is not necessarily the first
3460          * entry in the global dev_base list of net devices.  In fact,
3461          * it is likely to be the very last entry on that list.
3462          * So this causes the notifier registry below to try and
3463          * give link-local addresses to all devices besides loopback_dev
3464          * first, then loopback_dev, which cases all the non-loopback_dev
3465          * devices to fail to get a link-local address.
3466          *
3467          * So, as a temporary fix, register loopback_dev first by hand.
3468          * Longer term, all of the dependencies ipv6 has upon the loopback
3469          * device and it being up should be removed.
3470          */
3471         rtnl_lock();
3472         addrconf_notify(&ipv6_dev_notf, NETDEV_REGISTER, &loopback_dev);
3473         if (loopback_dev.flags & IFF_UP)
3474                 addrconf_notify(&ipv6_dev_notf, NETDEV_UP, &loopback_dev);
3475         rtnl_unlock();
3476
3477         register_netdevice_notifier(&ipv6_dev_notf);
3478
3479 #ifdef CONFIG_IPV6_PRIVACY
3480         md5_tfm = crypto_alloc_tfm("md5", 0);
3481         if (unlikely(md5_tfm == NULL))
3482                 printk(KERN_WARNING
3483                         "failed to load transform for md5\n");
3484 #endif
3485
3486         addrconf_verify(0);
3487         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3488 #ifdef CONFIG_SYSCTL
3489         addrconf_sysctl.sysctl_header =
3490                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3491         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3492 #endif
3493 }
3494
3495 void __exit addrconf_cleanup(void)
3496 {
3497         struct net_device *dev;
3498         struct inet6_dev *idev;
3499         struct inet6_ifaddr *ifa;
3500         int i;
3501
3502         unregister_netdevice_notifier(&ipv6_dev_notf);
3503
3504         rtnetlink_links[PF_INET6] = NULL;
3505 #ifdef CONFIG_SYSCTL
3506         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3507         addrconf_sysctl_unregister(&ipv6_devconf);
3508 #endif
3509
3510         rtnl_lock();
3511
3512         /*
3513          *      clean dev list.
3514          */
3515
3516         for (dev=dev_base; dev; dev=dev->next) {
3517                 if ((idev = __in6_dev_get(dev)) == NULL)
3518                         continue;
3519                 addrconf_ifdown(dev, 1);
3520         }
3521
3522         /*
3523          *      Check hash table.
3524          */
3525
3526         write_lock_bh(&addrconf_hash_lock);
3527         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3528                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3529                         struct inet6_ifaddr *bifa;
3530
3531                         bifa = ifa;
3532                         ifa = ifa->lst_next;
3533                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3534                         /* Do not free it; something is wrong.
3535                            Now we can investigate it with debugger.
3536                          */
3537                 }
3538         }
3539         write_unlock_bh(&addrconf_hash_lock);
3540
3541         del_timer(&addr_chk_timer);
3542
3543         rtnl_unlock();
3544
3545 #ifdef CONFIG_IPV6_PRIVACY
3546         if (likely(md5_tfm != NULL)) {
3547                 crypto_free_tfm(md5_tfm);
3548                 md5_tfm = NULL;
3549         }
3550 #endif
3551
3552 #ifdef CONFIG_PROC_FS
3553         proc_net_remove("if_inet6");
3554 #endif
3555 }