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   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <linux/if_tunnel.h>
  78 #include <linux/rtnetlink.h>
  79
  80 #ifdef CONFIG_IPV6_PRIVACY
  81 #include <linux/random.h>
  82 #endif
  83
  84 #include <asm/uaccess.h>
  85 #include <asm/unaligned.h>
  86
  87 #include <linux/proc_fs.h>
  88 #include <linux/seq_file.h>
  89
  90 /* Set to 3 to get tracing... */
  91 #define ACONF_DEBUG 2
  92
  93 #if ACONF_DEBUG >= 3
  94 #define ADBG(x) printk x
  95 #else
  96 #define ADBG(x)
  97 #endif
  98
  99 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 101
 102 #ifdef CONFIG_SYSCTL
 103 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 104 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 105 #endif
 106
 107 #ifdef CONFIG_IPV6_PRIVACY
 108 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 109 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 110 static void ipv6_regen_rndid(unsigned long data);
 111
 112 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 113 #endif
 114
 115 static int ipv6_count_addresses(struct inet6_dev *idev);
 116
 117 /*
 118  *      Configured unicast address hash table
 119  */
 120 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 121 static DEFINE_RWLOCK(addrconf_hash_lock);
 122
 123 static void addrconf_verify(unsigned long);
 124
 125 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 126 static DEFINE_SPINLOCK(addrconf_verify_lock);
 127
 128 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 129 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 130
 131 static int addrconf_ifdown(struct net_device *dev, int how);
 132
 133 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 134 static void addrconf_dad_timer(unsigned long data);
 135 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 136 static void addrconf_dad_run(struct inet6_dev *idev);
 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 ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 146
 147 struct ipv6_devconf ipv6_devconf __read_mostly = {
 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         .accept_ra_defrtr       = 1,
 168         .accept_ra_pinfo        = 1,
 169 #ifdef CONFIG_IPV6_ROUTER_PREF
 170         .accept_ra_rtr_pref     = 1,
 171         .rtr_probe_interval     = 60 * HZ,
 172 #ifdef CONFIG_IPV6_ROUTE_INFO
 173         .accept_ra_rt_info_max_plen = 0,
 174 #endif
 175 #endif
 176         .proxy_ndp              = 0,
 177         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 178 };
 179
 180 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 181         .forwarding             = 0,
 182         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 183         .mtu6                   = IPV6_MIN_MTU,
 184         .accept_ra              = 1,
 185         .accept_redirects       = 1,
 186         .autoconf               = 1,
 187         .dad_transmits          = 1,
 188         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 189         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 190         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 191 #ifdef CONFIG_IPV6_PRIVACY
 192         .use_tempaddr           = 0,
 193         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 194         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 195         .regen_max_retry        = REGEN_MAX_RETRY,
 196         .max_desync_factor      = MAX_DESYNC_FACTOR,
 197 #endif
 198         .max_addresses          = IPV6_MAX_ADDRESSES,
 199         .accept_ra_defrtr       = 1,
 200         .accept_ra_pinfo        = 1,
 201 #ifdef CONFIG_IPV6_ROUTER_PREF
 202         .accept_ra_rtr_pref     = 1,
 203         .rtr_probe_interval     = 60 * HZ,
 204 #ifdef CONFIG_IPV6_ROUTE_INFO
 205         .accept_ra_rt_info_max_plen = 0,
 206 #endif
 207 #endif
 208         .proxy_ndp              = 0,
 209         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 210 };
 211
 212 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 213 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 214 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 215
 216 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 217 {
 218         if (del_timer(&ifp->timer))
 219                 __in6_ifa_put(ifp);
 220 }
 221
 222 enum addrconf_timer_t
 223 {
 224         AC_NONE,
 225         AC_DAD,
 226         AC_RS,
 227 };
 228
 229 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 230                                enum addrconf_timer_t what,
 231                                unsigned long when)
 232 {
 233         if (!del_timer(&ifp->timer))
 234                 in6_ifa_hold(ifp);
 235
 236         switch (what) {
 237         case AC_DAD:
 238                 ifp->timer.function = addrconf_dad_timer;
 239                 break;
 240         case AC_RS:
 241                 ifp->timer.function = addrconf_rs_timer;
 242                 break;
 243         default:;
 244         }
 245         ifp->timer.expires = jiffies + when;
 246         add_timer(&ifp->timer);
 247 }
 248
 249 static int snmp6_alloc_dev(struct inet6_dev *idev)
 250 {
 251         int err = -ENOMEM;
 252
 253         if (!idev || !idev->dev)
 254                 return -EINVAL;
 255
 256         if (snmp_mib_init((void **)idev->stats.ipv6,
 257                           sizeof(struct ipstats_mib),
 258                           __alignof__(struct ipstats_mib)) < 0)
 259                 goto err_ip;
 260         if (snmp_mib_init((void **)idev->stats.icmpv6,
 261                           sizeof(struct icmpv6_mib),
 262                           __alignof__(struct icmpv6_mib)) < 0)
 263                 goto err_icmp;
 264
 265         return 0;
 266
 267 err_icmp:
 268         snmp_mib_free((void **)idev->stats.ipv6);
 269 err_ip:
 270         return err;
 271 }
 272
 273 static int snmp6_free_dev(struct inet6_dev *idev)
 274 {
 275         snmp_mib_free((void **)idev->stats.icmpv6);
 276         snmp_mib_free((void **)idev->stats.ipv6);
 277         return 0;
 278 }
 279
 280 /* Nobody refers to this device, we may destroy it. */
 281
 282 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 283 {
 284         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 285         kfree(idev);
 286 }
 287
 288 void in6_dev_finish_destroy(struct inet6_dev *idev)
 289 {
 290         struct net_device *dev = idev->dev;
 291         BUG_TRAP(idev->addr_list==NULL);
 292         BUG_TRAP(idev->mc_list==NULL);
 293 #ifdef NET_REFCNT_DEBUG
 294         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 295 #endif
 296         dev_put(dev);
 297         if (!idev->dead) {
 298                 printk("Freeing alive inet6 device %p\n", idev);
 299                 return;
 300         }
 301         snmp6_free_dev(idev);
 302         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 303 }
 304
 305 EXPORT_SYMBOL(in6_dev_finish_destroy);
 306
 307 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 308 {
 309         struct inet6_dev *ndev;
 310         struct in6_addr maddr;
 311
 312         ASSERT_RTNL();
 313
 314         if (dev->mtu < IPV6_MIN_MTU)
 315                 return NULL;
 316
 317         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 318
 319         if (ndev == NULL)
 320                 return NULL;
 321
 322         rwlock_init(&ndev->lock);
 323         ndev->dev = dev;
 324         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 325         ndev->cnf.mtu6 = dev->mtu;
 326         ndev->cnf.sysctl = NULL;
 327         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 328         if (ndev->nd_parms == NULL) {
 329                 kfree(ndev);
 330                 return NULL;
 331         }
 332         /* We refer to the device */
 333         dev_hold(dev);
 334
 335         if (snmp6_alloc_dev(ndev) < 0) {
 336                 ADBG((KERN_WARNING
 337                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 338                         __FUNCTION__, dev->name));
 339                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 340                 ndev->dead = 1;
 341                 in6_dev_finish_destroy(ndev);
 342                 return NULL;
 343         }
 344
 345         if (snmp6_register_dev(ndev) < 0) {
 346                 ADBG((KERN_WARNING
 347                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 348                         __FUNCTION__, dev->name));
 349                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 350                 ndev->dead = 1;
 351                 in6_dev_finish_destroy(ndev);
 352                 return NULL;
 353         }
 354
 355         /* One reference from device.  We must do this before
 356          * we invoke __ipv6_regen_rndid().
 357          */
 358         in6_dev_hold(ndev);
 359
 360 #ifdef CONFIG_IPV6_PRIVACY
 361         init_timer(&ndev->regen_timer);
 362         ndev->regen_timer.function = ipv6_regen_rndid;
 363         ndev->regen_timer.data = (unsigned long) ndev;
 364         if ((dev->flags&IFF_LOOPBACK) ||
 365             dev->type == ARPHRD_TUNNEL ||
 366 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 367             dev->type == ARPHRD_SIT ||
 368 #endif
 369             dev->type == ARPHRD_NONE) {
 370                 printk(KERN_INFO
 371                        "%s: Disabled Privacy Extensions\n",
 372                        dev->name);
 373                 ndev->cnf.use_tempaddr = -1;
 374         } else {
 375                 in6_dev_hold(ndev);
 376                 ipv6_regen_rndid((unsigned long) ndev);
 377         }
 378 #endif
 379
 380         if (netif_running(dev) && netif_carrier_ok(dev))
 381                 ndev->if_flags |= IF_READY;
 382
 383         ipv6_mc_init_dev(ndev);
 384         ndev->tstamp = jiffies;
 385 #ifdef CONFIG_SYSCTL
 386         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 387                               NET_IPV6_NEIGH, "ipv6",
 388                               &ndisc_ifinfo_sysctl_change,
 389                               NULL);
 390         addrconf_sysctl_register(ndev, &ndev->cnf);
 391 #endif
 392         /* protected by rtnl_lock */
 393         rcu_assign_pointer(dev->ip6_ptr, ndev);
 394
 395         /* Join all-node multicast group */
 396         ipv6_addr_all_nodes(&maddr);
 397         ipv6_dev_mc_inc(dev, &maddr);
 398
 399         return ndev;
 400 }
 401
 402 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 403 {
 404         struct inet6_dev *idev;
 405
 406         ASSERT_RTNL();
 407
 408         if ((idev = __in6_dev_get(dev)) == NULL) {
 409                 if ((idev = ipv6_add_dev(dev)) == NULL)
 410                         return NULL;
 411         }
 412
 413         if (dev->flags&IFF_UP)
 414                 ipv6_mc_up(idev);
 415         return idev;
 416 }
 417
 418 #ifdef CONFIG_SYSCTL
 419 static void dev_forward_change(struct inet6_dev *idev)
 420 {
 421         struct net_device *dev;
 422         struct inet6_ifaddr *ifa;
 423         struct in6_addr addr;
 424
 425         if (!idev)
 426                 return;
 427         dev = idev->dev;
 428         if (dev && (dev->flags & IFF_MULTICAST)) {
 429                 ipv6_addr_all_routers(&addr);
 430
 431                 if (idev->cnf.forwarding)
 432                         ipv6_dev_mc_inc(dev, &addr);
 433                 else
 434                         ipv6_dev_mc_dec(dev, &addr);
 435         }
 436         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 437                 if (ifa->flags&IFA_F_TENTATIVE)
 438                         continue;
 439                 if (idev->cnf.forwarding)
 440                         addrconf_join_anycast(ifa);
 441                 else
 442                         addrconf_leave_anycast(ifa);
 443         }
 444 }
 445
 446
 447 static void addrconf_forward_change(void)
 448 {
 449         struct net_device *dev;
 450         struct inet6_dev *idev;
 451
 452         read_lock(&dev_base_lock);
 453         for_each_netdev(dev) {
 454                 rcu_read_lock();
 455                 idev = __in6_dev_get(dev);
 456                 if (idev) {
 457                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 458                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 459                         if (changed)
 460                                 dev_forward_change(idev);
 461                 }
 462                 rcu_read_unlock();
 463         }
 464         read_unlock(&dev_base_lock);
 465 }
 466 #endif
 467
 468 /* Nobody refers to this ifaddr, destroy it */
 469
 470 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 471 {
 472         BUG_TRAP(ifp->if_next==NULL);
 473         BUG_TRAP(ifp->lst_next==NULL);
 474 #ifdef NET_REFCNT_DEBUG
 475         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 476 #endif
 477
 478         in6_dev_put(ifp->idev);
 479
 480         if (del_timer(&ifp->timer))
 481                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 482
 483         if (!ifp->dead) {
 484                 printk("Freeing alive inet6 address %p\n", ifp);
 485                 return;
 486         }
 487         dst_release(&ifp->rt->u.dst);
 488
 489         kfree(ifp);
 490 }
 491
 492 static void
 493 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 494 {
 495         struct inet6_ifaddr *ifa, **ifap;
 496         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 497
 498         /*
 499          * Each device address list is sorted in order of scope -
 500          * global before linklocal.
 501          */
 502         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 503              ifap = &ifa->if_next) {
 504                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 505                         break;
 506         }
 507
 508         ifp->if_next = *ifap;
 509         *ifap = ifp;
 510 }
 511
 512 /* On success it returns ifp with increased reference count */
 513
 514 static struct inet6_ifaddr *
 515 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 516               int scope, u32 flags)
 517 {
 518         struct inet6_ifaddr *ifa = NULL;
 519         struct rt6_info *rt;
 520         int hash;
 521         int err = 0;
 522
 523         rcu_read_lock_bh();
 524         if (idev->dead) {
 525                 err = -ENODEV;                  /*XXX*/
 526                 goto out2;
 527         }
 528
 529         write_lock(&addrconf_hash_lock);
 530
 531         /* Ignore adding duplicate addresses on an interface */
 532         if (ipv6_chk_same_addr(addr, idev->dev)) {
 533                 ADBG(("ipv6_add_addr: already assigned\n"));
 534                 err = -EEXIST;
 535                 goto out;
 536         }
 537
 538         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 539
 540         if (ifa == NULL) {
 541                 ADBG(("ipv6_add_addr: malloc failed\n"));
 542                 err = -ENOBUFS;
 543                 goto out;
 544         }
 545
 546         rt = addrconf_dst_alloc(idev, addr, 0);
 547         if (IS_ERR(rt)) {
 548                 err = PTR_ERR(rt);
 549                 goto out;
 550         }
 551
 552         ipv6_addr_copy(&ifa->addr, addr);
 553
 554         spin_lock_init(&ifa->lock);
 555         init_timer(&ifa->timer);
 556         ifa->timer.data = (unsigned long) ifa;
 557         ifa->scope = scope;
 558         ifa->prefix_len = pfxlen;
 559         ifa->flags = flags | IFA_F_TENTATIVE;
 560         ifa->cstamp = ifa->tstamp = jiffies;
 561
 562         ifa->rt = rt;
 563
 564         /*
 565          * part one of RFC 4429, section 3.3
 566          * We should not configure an address as
 567          * optimistic if we do not yet know the link
 568          * layer address of our nexhop router
 569          */
 570
 571         if (rt->rt6i_nexthop == NULL)
 572                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 573
 574         ifa->idev = idev;
 575         in6_dev_hold(idev);
 576         /* For caller */
 577         in6_ifa_hold(ifa);
 578
 579         /* Add to big hash table */
 580         hash = ipv6_addr_hash(addr);
 581
 582         ifa->lst_next = inet6_addr_lst[hash];
 583         inet6_addr_lst[hash] = ifa;
 584         in6_ifa_hold(ifa);
 585         write_unlock(&addrconf_hash_lock);
 586
 587         write_lock(&idev->lock);
 588         /* Add to inet6_dev unicast addr list. */
 589         ipv6_link_dev_addr(idev, ifa);
 590
 591 #ifdef CONFIG_IPV6_PRIVACY
 592         if (ifa->flags&IFA_F_TEMPORARY) {
 593                 ifa->tmp_next = idev->tempaddr_list;
 594                 idev->tempaddr_list = ifa;
 595                 in6_ifa_hold(ifa);
 596         }
 597 #endif
 598
 599         in6_ifa_hold(ifa);
 600         write_unlock(&idev->lock);
 601 out2:
 602         rcu_read_unlock_bh();
 603
 604         if (likely(err == 0))
 605                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 606         else {
 607                 kfree(ifa);
 608                 ifa = ERR_PTR(err);
 609         }
 610
 611         return ifa;
 612 out:
 613         write_unlock(&addrconf_hash_lock);
 614         goto out2;
 615 }
 616
 617 /* This function wants to get referenced ifp and releases it before return */
 618
 619 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 620 {
 621         struct inet6_ifaddr *ifa, **ifap;
 622         struct inet6_dev *idev = ifp->idev;
 623         int hash;
 624         int deleted = 0, onlink = 0;
 625         unsigned long expires = jiffies;
 626
 627         hash = ipv6_addr_hash(&ifp->addr);
 628
 629         ifp->dead = 1;
 630
 631         write_lock_bh(&addrconf_hash_lock);
 632         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 633              ifap = &ifa->lst_next) {
 634                 if (ifa == ifp) {
 635                         *ifap = ifa->lst_next;
 636                         __in6_ifa_put(ifp);
 637                         ifa->lst_next = NULL;
 638                         break;
 639                 }
 640         }
 641         write_unlock_bh(&addrconf_hash_lock);
 642
 643         write_lock_bh(&idev->lock);
 644 #ifdef CONFIG_IPV6_PRIVACY
 645         if (ifp->flags&IFA_F_TEMPORARY) {
 646                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 647                      ifap = &ifa->tmp_next) {
 648                         if (ifa == ifp) {
 649                                 *ifap = ifa->tmp_next;
 650                                 if (ifp->ifpub) {
 651                                         in6_ifa_put(ifp->ifpub);
 652                                         ifp->ifpub = NULL;
 653                                 }
 654                                 __in6_ifa_put(ifp);
 655                                 ifa->tmp_next = NULL;
 656                                 break;
 657                         }
 658                 }
 659         }
 660 #endif
 661
 662         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 663                 if (ifa == ifp) {
 664                         *ifap = ifa->if_next;
 665                         __in6_ifa_put(ifp);
 666                         ifa->if_next = NULL;
 667                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 668                                 break;
 669                         deleted = 1;
 670                         continue;
 671                 } else if (ifp->flags & IFA_F_PERMANENT) {
 672                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 673                                               ifp->prefix_len)) {
 674                                 if (ifa->flags & IFA_F_PERMANENT) {
 675                                         onlink = 1;
 676                                         if (deleted)
 677                                                 break;
 678                                 } else {
 679                                         unsigned long lifetime;
 680
 681                                         if (!onlink)
 682                                                 onlink = -1;
 683
 684                                         spin_lock(&ifa->lock);
 685                                         lifetime = min_t(unsigned long,
 686                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 687                                         if (time_before(expires,
 688                                                         ifa->tstamp + lifetime * HZ))
 689                                                 expires = ifa->tstamp + lifetime * HZ;
 690                                         spin_unlock(&ifa->lock);
 691                                 }
 692                         }
 693                 }
 694                 ifap = &ifa->if_next;
 695         }
 696         write_unlock_bh(&idev->lock);
 697
 698         ipv6_ifa_notify(RTM_DELADDR, ifp);
 699
 700         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 701
 702         addrconf_del_timer(ifp);
 703
 704         /*
 705          * Purge or update corresponding prefix
 706          *
 707          * 1) we don't purge prefix here if address was not permanent.
 708          *    prefix is managed by its own lifetime.
 709          * 2) if there're no addresses, delete prefix.
 710          * 3) if there're still other permanent address(es),
 711          *    corresponding prefix is still permanent.
 712          * 4) otherwise, update prefix lifetime to the
 713          *    longest valid lifetime among the corresponding
 714          *    addresses on the device.
 715          *    Note: subsequent RA will update lifetime.
 716          *
 717          * --yoshfuji
 718          */
 719         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 720                 struct in6_addr prefix;
 721                 struct rt6_info *rt;
 722
 723                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 724                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 725
 726                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 727                         if (onlink == 0) {
 728                                 ip6_del_rt(rt);
 729                                 rt = NULL;
 730                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 731                                 rt->rt6i_expires = expires;
 732                                 rt->rt6i_flags |= RTF_EXPIRES;
 733                         }
 734                 }
 735                 dst_release(&rt->u.dst);
 736         }
 737
 738         in6_ifa_put(ifp);
 739 }
 740
 741 #ifdef CONFIG_IPV6_PRIVACY
 742 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 743 {
 744         struct inet6_dev *idev = ifp->idev;
 745         struct in6_addr addr, *tmpaddr;
 746         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 747         int tmp_plen;
 748         int ret = 0;
 749         int max_addresses;
 750         u32 addr_flags;
 751
 752         write_lock(&idev->lock);
 753         if (ift) {
 754                 spin_lock_bh(&ift->lock);
 755                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 756                 spin_unlock_bh(&ift->lock);
 757                 tmpaddr = &addr;
 758         } else {
 759                 tmpaddr = NULL;
 760         }
 761 retry:
 762         in6_dev_hold(idev);
 763         if (idev->cnf.use_tempaddr <= 0) {
 764                 write_unlock(&idev->lock);
 765                 printk(KERN_INFO
 766                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 767                 in6_dev_put(idev);
 768                 ret = -1;
 769                 goto out;
 770         }
 771         spin_lock_bh(&ifp->lock);
 772         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 773                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 774                 spin_unlock_bh(&ifp->lock);
 775                 write_unlock(&idev->lock);
 776                 printk(KERN_WARNING
 777                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 778                 in6_dev_put(idev);
 779                 ret = -1;
 780                 goto out;
 781         }
 782         in6_ifa_hold(ifp);
 783         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 784         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 785                 spin_unlock_bh(&ifp->lock);
 786                 write_unlock(&idev->lock);
 787                 printk(KERN_WARNING
 788                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 789                 in6_ifa_put(ifp);
 790                 in6_dev_put(idev);
 791                 ret = -1;
 792                 goto out;
 793         }
 794         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 795         tmp_valid_lft = min_t(__u32,
 796                               ifp->valid_lft,
 797                               idev->cnf.temp_valid_lft);
 798         tmp_prefered_lft = min_t(__u32,
 799                                  ifp->prefered_lft,
 800                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 801         tmp_plen = ifp->prefix_len;
 802         max_addresses = idev->cnf.max_addresses;
 803         tmp_cstamp = ifp->cstamp;
 804         tmp_tstamp = ifp->tstamp;
 805         spin_unlock_bh(&ifp->lock);
 806
 807         write_unlock(&idev->lock);
 808
 809         addr_flags = IFA_F_TEMPORARY;
 810         /* set in addrconf_prefix_rcv() */
 811         if (ifp->flags & IFA_F_OPTIMISTIC)
 812                 addr_flags |= IFA_F_OPTIMISTIC;
 813
 814         ift = !max_addresses ||
 815               ipv6_count_addresses(idev) < max_addresses ?
 816                 ipv6_add_addr(idev, &addr, tmp_plen,
 817                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 818                               addr_flags) : NULL;
 819         if (!ift || IS_ERR(ift)) {
 820                 in6_ifa_put(ifp);
 821                 in6_dev_put(idev);
 822                 printk(KERN_INFO
 823                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 824                 tmpaddr = &addr;
 825                 write_lock(&idev->lock);
 826                 goto retry;
 827         }
 828
 829         spin_lock_bh(&ift->lock);
 830         ift->ifpub = ifp;
 831         ift->valid_lft = tmp_valid_lft;
 832         ift->prefered_lft = tmp_prefered_lft;
 833         ift->cstamp = tmp_cstamp;
 834         ift->tstamp = tmp_tstamp;
 835         spin_unlock_bh(&ift->lock);
 836
 837         addrconf_dad_start(ift, 0);
 838         in6_ifa_put(ift);
 839         in6_dev_put(idev);
 840 out:
 841         return ret;
 842 }
 843 #endif
 844
 845 /*
 846  *      Choose an appropriate source address (RFC3484)
 847  */
 848 struct ipv6_saddr_score {
 849         int             addr_type;
 850         unsigned int    attrs;
 851         int             matchlen;
 852         int             scope;
 853         unsigned int    rule;
 854 };
 855
 856 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 857 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 858 #define IPV6_SADDR_SCORE_HOA            0x0008
 859 #define IPV6_SADDR_SCORE_OIF            0x0010
 860 #define IPV6_SADDR_SCORE_LABEL          0x0020
 861 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 862
 863 static inline int ipv6_saddr_preferred(int type)
 864 {
 865         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 866                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 867                 return 1;
 868         return 0;
 869 }
 870
 871 /* static matching label */
 872 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
 873 {
 874  /*
 875   *     prefix (longest match)  label
 876   *     -----------------------------
 877   *     ::1/128                 0
 878   *     ::/0                    1
 879   *     2002::/16               2
 880   *     ::/96                   3
 881   *     ::ffff:0:0/96           4
 882   *     fc00::/7                5
 883   *     2001::/32               6
 884   */
 885         if (type & IPV6_ADDR_LOOPBACK)
 886                 return 0;
 887         else if (type & IPV6_ADDR_COMPATv4)
 888                 return 3;
 889         else if (type & IPV6_ADDR_MAPPED)
 890                 return 4;
 891         else if (addr->s6_addr32[0] == htonl(0x20010000))
 892                 return 6;
 893         else if (addr->s6_addr16[0] == htons(0x2002))
 894                 return 2;
 895         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 896                 return 5;
 897         return 1;
 898 }
 899
 900 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 901                        struct in6_addr *daddr, struct in6_addr *saddr)
 902 {
 903         struct ipv6_saddr_score hiscore;
 904         struct inet6_ifaddr *ifa_result = NULL;
 905         int daddr_type = __ipv6_addr_type(daddr);
 906         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 907         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 908         struct net_device *dev;
 909
 910         memset(&hiscore, 0, sizeof(hiscore));
 911
 912         read_lock(&dev_base_lock);
 913         rcu_read_lock();
 914
 915         for_each_netdev(dev) {
 916                 struct inet6_dev *idev;
 917                 struct inet6_ifaddr *ifa;
 918
 919                 /* Rule 0: Candidate Source Address (section 4)
 920                  *  - multicast and link-local destination address,
 921                  *    the set of candidate source address MUST only
 922                  *    include addresses assigned to interfaces
 923                  *    belonging to the same link as the outgoing
 924                  *    interface.
 925                  * (- For site-local destination addresses, the
 926                  *    set of candidate source addresses MUST only
 927                  *    include addresses assigned to interfaces
 928                  *    belonging to the same site as the outgoing
 929                  *    interface.)
 930                  */
 931                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 932                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 933                     daddr_dev && dev != daddr_dev)
 934                         continue;
 935
 936                 idev = __in6_dev_get(dev);
 937                 if (!idev)
 938                         continue;
 939
 940                 read_lock_bh(&idev->lock);
 941                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 942                         struct ipv6_saddr_score score;
 943
 944                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 945
 946                         /* Rule 0:
 947                          * - Tentative Address (RFC2462 section 5.4)
 948                          *  - A tentative address is not considered
 949                          *    "assigned to an interface" in the traditional
 950                          *    sense, unless it is also flagged as optimistic.
 951                          * - Candidate Source Address (section 4)
 952                          *  - In any case, anycast addresses, multicast
 953                          *    addresses, and the unspecified address MUST
 954                          *    NOT be included in a candidate set.
 955                          */
 956                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 957                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 958                                 continue;
 959                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 960                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 961                                 LIMIT_NETDEBUG(KERN_DEBUG
 962                                                "ADDRCONF: unspecified / multicast address"
 963                                                "assigned as unicast address on %s",
 964                                                dev->name);
 965                                 continue;
 966                         }
 967
 968                         score.attrs = 0;
 969                         score.matchlen = 0;
 970                         score.scope = 0;
 971                         score.rule = 0;
 972
 973                         if (ifa_result == NULL) {
 974                                 /* record it if the first available entry */
 975                                 goto record_it;
 976                         }
 977
 978                         /* Rule 1: Prefer same address */
 979                         if (hiscore.rule < 1) {
 980                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 981                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 982                                 hiscore.rule++;
 983                         }
 984                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 985                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 986                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 987                                         score.rule = 1;
 988                                         goto record_it;
 989                                 }
 990                         } else {
 991                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 992                                         continue;
 993                         }
 994
 995                         /* Rule 2: Prefer appropriate scope */
 996                         if (hiscore.rule < 2) {
 997                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 998                                 hiscore.rule++;
 999                         }
1000                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1001                         if (hiscore.scope < score.scope) {
1002                                 if (hiscore.scope < daddr_scope) {
1003                                         score.rule = 2;
1004                                         goto record_it;
1005                                 } else
1006                                         continue;
1007                         } else if (score.scope < hiscore.scope) {
1008                                 if (score.scope < daddr_scope)
1009                                         break; /* addresses sorted by scope */
1010                                 else {
1011                                         score.rule = 2;
1012                                         goto record_it;
1013                                 }
1014                         }
1015
1016                         /* Rule 3: Avoid deprecated and optimistic addresses */
1017                         if (hiscore.rule < 3) {
1018                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1019                                    (((ifa_result->flags &
1020                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1021                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1022                                 hiscore.rule++;
1023                         }
1024                         if (ipv6_saddr_preferred(score.addr_type) ||
1025                            (((ifa->flags &
1026                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1027                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1028                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1029                                         score.rule = 3;
1030                                         goto record_it;
1031                                 }
1032                         } else {
1033                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1034                                         continue;
1035                         }
1036
1037                         /* Rule 4: Prefer home address */
1038 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1039                         if (hiscore.rule < 4) {
1040                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1041                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1042                                 hiscore.rule++;
1043                         }
1044                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1045                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1046                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1047                                         score.rule = 4;
1048                                         goto record_it;
1049                                 }
1050                         } else {
1051                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1052                                         continue;
1053                         }
1054 #else
1055                         if (hiscore.rule < 4)
1056                                 hiscore.rule++;
1057 #endif
1058
1059                         /* Rule 5: Prefer outgoing interface */
1060                         if (hiscore.rule < 5) {
1061                                 if (daddr_dev == NULL ||
1062                                     daddr_dev == ifa_result->idev->dev)
1063                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1064                                 hiscore.rule++;
1065                         }
1066                         if (daddr_dev == NULL ||
1067                             daddr_dev == ifa->idev->dev) {
1068                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1069                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1070                                         score.rule = 5;
1071                                         goto record_it;
1072                                 }
1073                         } else {
1074                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1075                                         continue;
1076                         }
1077
1078                         /* Rule 6: Prefer matching label */
1079                         if (hiscore.rule < 6) {
1080                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1081                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1082                                 hiscore.rule++;
1083                         }
1084                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1085                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1086                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1087                                         score.rule = 6;
1088                                         goto record_it;
1089                                 }
1090                         } else {
1091                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1092                                         continue;
1093                         }
1094
1095 #ifdef CONFIG_IPV6_PRIVACY
1096                         /* Rule 7: Prefer public address
1097                          * Note: prefer temprary address if use_tempaddr >= 2
1098                          */
1099                         if (hiscore.rule < 7) {
1100                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1101                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1102                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1103                                 hiscore.rule++;
1104                         }
1105                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1106                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1107                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1108                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1109                                         score.rule = 7;
1110                                         goto record_it;
1111                                 }
1112                         } else {
1113                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1114                                         continue;
1115                         }
1116 #else
1117                         if (hiscore.rule < 7)
1118                                 hiscore.rule++;
1119 #endif
1120                         /* Rule 8: Use longest matching prefix */
1121                         if (hiscore.rule < 8) {
1122                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1123                                 hiscore.rule++;
1124                         }
1125                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1126                         if (score.matchlen > hiscore.matchlen) {
1127                                 score.rule = 8;
1128                                 goto record_it;
1129                         }
1130 #if 0
1131                         else if (score.matchlen < hiscore.matchlen)
1132                                 continue;
1133 #endif
1134
1135                         /* Final Rule: choose first available one */
1136                         continue;
1137 record_it:
1138                         if (ifa_result)
1139                                 in6_ifa_put(ifa_result);
1140                         in6_ifa_hold(ifa);
1141                         ifa_result = ifa;
1142                         hiscore = score;
1143                 }
1144                 read_unlock_bh(&idev->lock);
1145         }
1146         rcu_read_unlock();
1147         read_unlock(&dev_base_lock);
1148
1149         if (!ifa_result)
1150                 return -EADDRNOTAVAIL;
1151
1152         ipv6_addr_copy(saddr, &ifa_result->addr);
1153         in6_ifa_put(ifa_result);
1154         return 0;
1155 }
1156
1157
1158 int ipv6_get_saddr(struct dst_entry *dst,
1159                    struct in6_addr *daddr, struct in6_addr *saddr)
1160 {
1161         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1162 }
1163
1164 EXPORT_SYMBOL(ipv6_get_saddr);
1165
1166 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1167                     unsigned char banned_flags)
1168 {
1169         struct inet6_dev *idev;
1170         int err = -EADDRNOTAVAIL;
1171
1172         rcu_read_lock();
1173         if ((idev = __in6_dev_get(dev)) != NULL) {
1174                 struct inet6_ifaddr *ifp;
1175
1176                 read_lock_bh(&idev->lock);
1177                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1178                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1179                                 ipv6_addr_copy(addr, &ifp->addr);
1180                                 err = 0;
1181                                 break;
1182                         }
1183                 }
1184                 read_unlock_bh(&idev->lock);
1185         }
1186         rcu_read_unlock();
1187         return err;
1188 }
1189
1190 static int ipv6_count_addresses(struct inet6_dev *idev)
1191 {
1192         int cnt = 0;
1193         struct inet6_ifaddr *ifp;
1194
1195         read_lock_bh(&idev->lock);
1196         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1197                 cnt++;
1198         read_unlock_bh(&idev->lock);
1199         return cnt;
1200 }
1201
1202 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1203 {
1204         struct inet6_ifaddr * ifp;
1205         u8 hash = ipv6_addr_hash(addr);
1206
1207         read_lock_bh(&addrconf_hash_lock);
1208         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1209                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1210                     !(ifp->flags&IFA_F_TENTATIVE)) {
1211                         if (dev == NULL || ifp->idev->dev == dev ||
1212                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1213                                 break;
1214                 }
1215         }
1216         read_unlock_bh(&addrconf_hash_lock);
1217         return ifp != NULL;
1218 }
1219
1220 EXPORT_SYMBOL(ipv6_chk_addr);
1221
1222 static
1223 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1224 {
1225         struct inet6_ifaddr * ifp;
1226         u8 hash = ipv6_addr_hash(addr);
1227
1228         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1229                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1230                         if (dev == NULL || ifp->idev->dev == dev)
1231                                 break;
1232                 }
1233         }
1234         return ifp != NULL;
1235 }
1236
1237 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1238 {
1239         struct inet6_ifaddr * ifp;
1240         u8 hash = ipv6_addr_hash(addr);
1241
1242         read_lock_bh(&addrconf_hash_lock);
1243         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1244                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1245                         if (dev == NULL || ifp->idev->dev == dev ||
1246                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1247                                 in6_ifa_hold(ifp);
1248                                 break;
1249                         }
1250                 }
1251         }
1252         read_unlock_bh(&addrconf_hash_lock);
1253
1254         return ifp;
1255 }
1256
1257 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1258 {
1259         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1260         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1261         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1262         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1263         int sk_ipv6only = ipv6_only_sock(sk);
1264         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1265         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1266         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1267
1268         if (!sk2_rcv_saddr && !sk_ipv6only)
1269                 return 1;
1270
1271         if (addr_type2 == IPV6_ADDR_ANY &&
1272             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1273                 return 1;
1274
1275         if (addr_type == IPV6_ADDR_ANY &&
1276             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1277                 return 1;
1278
1279         if (sk2_rcv_saddr6 &&
1280             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1281                 return 1;
1282
1283         if (addr_type == IPV6_ADDR_MAPPED &&
1284             !sk2_ipv6only &&
1285             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1286                 return 1;
1287
1288         return 0;
1289 }
1290
1291 /* Gets referenced address, destroys ifaddr */
1292
1293 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1294 {
1295         if (ifp->flags&IFA_F_PERMANENT) {
1296                 spin_lock_bh(&ifp->lock);
1297                 addrconf_del_timer(ifp);
1298                 ifp->flags |= IFA_F_TENTATIVE;
1299                 spin_unlock_bh(&ifp->lock);
1300                 in6_ifa_put(ifp);
1301 #ifdef CONFIG_IPV6_PRIVACY
1302         } else if (ifp->flags&IFA_F_TEMPORARY) {
1303                 struct inet6_ifaddr *ifpub;
1304                 spin_lock_bh(&ifp->lock);
1305                 ifpub = ifp->ifpub;
1306                 if (ifpub) {
1307                         in6_ifa_hold(ifpub);
1308                         spin_unlock_bh(&ifp->lock);
1309                         ipv6_create_tempaddr(ifpub, ifp);
1310                         in6_ifa_put(ifpub);
1311                 } else {
1312                         spin_unlock_bh(&ifp->lock);
1313                 }
1314                 ipv6_del_addr(ifp);
1315 #endif
1316         } else
1317                 ipv6_del_addr(ifp);
1318 }
1319
1320 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1321 {
1322         if (net_ratelimit())
1323                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1324         addrconf_dad_stop(ifp);
1325 }
1326
1327 /* Join to solicited addr multicast group. */
1328
1329 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1330 {
1331         struct in6_addr maddr;
1332
1333         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1334                 return;
1335
1336         addrconf_addr_solict_mult(addr, &maddr);
1337         ipv6_dev_mc_inc(dev, &maddr);
1338 }
1339
1340 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1341 {
1342         struct in6_addr maddr;
1343
1344         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1345                 return;
1346
1347         addrconf_addr_solict_mult(addr, &maddr);
1348         __ipv6_dev_mc_dec(idev, &maddr);
1349 }
1350
1351 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1352 {
1353         struct in6_addr addr;
1354         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1355         if (ipv6_addr_any(&addr))
1356                 return;
1357         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1358 }
1359
1360 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1361 {
1362         struct in6_addr addr;
1363         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1364         if (ipv6_addr_any(&addr))
1365                 return;
1366         __ipv6_dev_ac_dec(ifp->idev, &addr);
1367 }
1368
1369 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1370 {
1371         if (dev->addr_len != ETH_ALEN)
1372                 return -1;
1373         memcpy(eui, dev->dev_addr, 3);
1374         memcpy(eui + 5, dev->dev_addr + 3, 3);
1375
1376         /*
1377          * The zSeries OSA network cards can be shared among various
1378          * OS instances, but the OSA cards have only one MAC address.
1379          * This leads to duplicate address conflicts in conjunction
1380          * with IPv6 if more than one instance uses the same card.
1381          *
1382          * The driver for these cards can deliver a unique 16-bit
1383          * identifier for each instance sharing the same card.  It is
1384          * placed instead of 0xFFFE in the interface identifier.  The
1385          * "u" bit of the interface identifier is not inverted in this
1386          * case.  Hence the resulting interface identifier has local
1387          * scope according to RFC2373.
1388          */
1389         if (dev->dev_id) {
1390                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1391                 eui[4] = dev->dev_id & 0xFF;
1392         } else {
1393                 eui[3] = 0xFF;
1394                 eui[4] = 0xFE;
1395                 eui[0] ^= 2;
1396         }
1397         return 0;
1398 }
1399
1400 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1401 {
1402         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1403         if (dev->addr_len != ARCNET_ALEN)
1404                 return -1;
1405         memset(eui, 0, 7);
1406         eui[7] = *(u8*)dev->dev_addr;
1407         return 0;
1408 }
1409
1410 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1411 {
1412         if (dev->addr_len != INFINIBAND_ALEN)
1413                 return -1;
1414         memcpy(eui, dev->dev_addr + 12, 8);
1415         eui[0] |= 2;
1416         return 0;
1417 }
1418
1419 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1420 {
1421         switch (dev->type) {
1422         case ARPHRD_ETHER:
1423         case ARPHRD_FDDI:
1424         case ARPHRD_IEEE802_TR:
1425                 return addrconf_ifid_eui48(eui, dev);
1426         case ARPHRD_ARCNET:
1427                 return addrconf_ifid_arcnet(eui, dev);
1428         case ARPHRD_INFINIBAND:
1429                 return addrconf_ifid_infiniband(eui, dev);
1430         }
1431         return -1;
1432 }
1433
1434 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1435 {
1436         int err = -1;
1437         struct inet6_ifaddr *ifp;
1438
1439         read_lock_bh(&idev->lock);
1440         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1441                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1442                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1443                         err = 0;
1444                         break;
1445                 }
1446         }
1447         read_unlock_bh(&idev->lock);
1448         return err;
1449 }
1450
1451 #ifdef CONFIG_IPV6_PRIVACY
1452 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1453 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1454 {
1455 regen:
1456         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1457         idev->rndid[0] &= ~0x02;
1458
1459         /*
1460          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1461          * check if generated address is not inappropriate
1462          *
1463          *  - Reserved subnet anycast (RFC 2526)
1464          *      11111101 11....11 1xxxxxxx
1465          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1466          *      00-00-5E-FE-xx-xx-xx-xx
1467          *  - value 0
1468          *  - XXX: already assigned to an address on the device
1469          */
1470         if (idev->rndid[0] == 0xfd &&
1471             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1472             (idev->rndid[7]&0x80))
1473                 goto regen;
1474         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1475                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1476                         goto regen;
1477                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1478                         goto regen;
1479         }
1480
1481         return 0;
1482 }
1483
1484 static void ipv6_regen_rndid(unsigned long data)
1485 {
1486         struct inet6_dev *idev = (struct inet6_dev *) data;
1487         unsigned long expires;
1488
1489         rcu_read_lock_bh();
1490         write_lock_bh(&idev->lock);
1491
1492         if (idev->dead)
1493                 goto out;
1494
1495         if (__ipv6_regen_rndid(idev) < 0)
1496                 goto out;
1497
1498         expires = jiffies +
1499                 idev->cnf.temp_prefered_lft * HZ -
1500                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1501         if (time_before(expires, jiffies)) {
1502                 printk(KERN_WARNING
1503                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1504                         idev->dev->name);
1505                 goto out;
1506         }
1507
1508         if (!mod_timer(&idev->regen_timer, expires))
1509                 in6_dev_hold(idev);
1510
1511 out:
1512         write_unlock_bh(&idev->lock);
1513         rcu_read_unlock_bh();
1514         in6_dev_put(idev);
1515 }
1516
1517 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1518         int ret = 0;
1519
1520         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1521                 ret = __ipv6_regen_rndid(idev);
1522         return ret;
1523 }
1524 #endif
1525
1526 /*
1527  *      Add prefix route.
1528  */
1529
1530 static void
1531 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1532                       unsigned long expires, u32 flags)
1533 {
1534         struct fib6_config cfg = {
1535                 .fc_table = RT6_TABLE_PREFIX,
1536                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1537                 .fc_ifindex = dev->ifindex,
1538                 .fc_expires = expires,
1539                 .fc_dst_len = plen,
1540                 .fc_flags = RTF_UP | flags,
1541         };
1542
1543         ipv6_addr_copy(&cfg.fc_dst, pfx);
1544
1545         /* Prevent useless cloning on PtP SIT.
1546            This thing is done here expecting that the whole
1547            class of non-broadcast devices need not cloning.
1548          */
1549 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1550         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1551                 cfg.fc_flags |= RTF_NONEXTHOP;
1552 #endif
1553
1554         ip6_route_add(&cfg);
1555 }
1556
1557 /* Create "default" multicast route to the interface */
1558
1559 static void addrconf_add_mroute(struct net_device *dev)
1560 {
1561         struct fib6_config cfg = {
1562                 .fc_table = RT6_TABLE_LOCAL,
1563                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1564                 .fc_ifindex = dev->ifindex,
1565                 .fc_dst_len = 8,
1566                 .fc_flags = RTF_UP,
1567         };
1568
1569         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1570
1571         ip6_route_add(&cfg);
1572 }
1573
1574 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1575 static void sit_route_add(struct net_device *dev)
1576 {
1577         struct fib6_config cfg = {
1578                 .fc_table = RT6_TABLE_MAIN,
1579                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1580                 .fc_ifindex = dev->ifindex,
1581                 .fc_dst_len = 96,
1582                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1583         };
1584
1585         /* prefix length - 96 bits "::d.d.d.d" */
1586         ip6_route_add(&cfg);
1587 }
1588 #endif
1589
1590 static void addrconf_add_lroute(struct net_device *dev)
1591 {
1592         struct in6_addr addr;
1593
1594         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1595         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1596 }
1597
1598 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1599 {
1600         struct inet6_dev *idev;
1601
1602         ASSERT_RTNL();
1603
1604         if ((idev = ipv6_find_idev(dev)) == NULL)
1605                 return NULL;
1606
1607         /* Add default multicast route */
1608         addrconf_add_mroute(dev);
1609
1610         /* Add link local route */
1611         addrconf_add_lroute(dev);
1612         return idev;
1613 }
1614
1615 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1616 {
1617         struct prefix_info *pinfo;
1618         __u32 valid_lft;
1619         __u32 prefered_lft;
1620         int addr_type;
1621         unsigned long rt_expires;
1622         struct inet6_dev *in6_dev;
1623
1624         pinfo = (struct prefix_info *) opt;
1625
1626         if (len < sizeof(struct prefix_info)) {
1627                 ADBG(("addrconf: prefix option too short\n"));
1628                 return;
1629         }
1630
1631         /*
1632          *      Validation checks ([ADDRCONF], page 19)
1633          */
1634
1635         addr_type = ipv6_addr_type(&pinfo->prefix);
1636
1637         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1638                 return;
1639
1640         valid_lft = ntohl(pinfo->valid);
1641         prefered_lft = ntohl(pinfo->prefered);
1642
1643         if (prefered_lft > valid_lft) {
1644                 if (net_ratelimit())
1645                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1646                 return;
1647         }
1648
1649         in6_dev = in6_dev_get(dev);
1650
1651         if (in6_dev == NULL) {
1652                 if (net_ratelimit())
1653                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1654                 return;
1655         }
1656
1657         /*
1658          *      Two things going on here:
1659          *      1) Add routes for on-link prefixes
1660          *      2) Configure prefixes with the auto flag set
1661          */
1662
1663         /* Avoid arithmetic overflow. Really, we could
1664            save rt_expires in seconds, likely valid_lft,
1665            but it would require division in fib gc, that it
1666            not good.
1667          */
1668         if (valid_lft >= 0x7FFFFFFF/HZ)
1669                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1670         else
1671                 rt_expires = valid_lft * HZ;
1672
1673         /*
1674          * We convert this (in jiffies) to clock_t later.
1675          * Avoid arithmetic overflow there as well.
1676          * Overflow can happen only if HZ < USER_HZ.
1677          */
1678         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1679                 rt_expires = 0x7FFFFFFF / USER_HZ;
1680
1681         if (pinfo->onlink) {
1682                 struct rt6_info *rt;
1683                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1684
1685                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1686                         if (rt->rt6i_flags&RTF_EXPIRES) {
1687                                 if (valid_lft == 0) {
1688                                         ip6_del_rt(rt);
1689                                         rt = NULL;
1690                                 } else {
1691                                         rt->rt6i_expires = jiffies + rt_expires;
1692                                 }
1693                         }
1694                 } else if (valid_lft) {
1695                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1696                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1697                 }
1698                 if (rt)
1699                         dst_release(&rt->u.dst);
1700         }
1701
1702         /* Try to figure out our local address for this prefix */
1703
1704         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1705                 struct inet6_ifaddr * ifp;
1706                 struct in6_addr addr;
1707                 int create = 0, update_lft = 0;
1708
1709                 if (pinfo->prefix_len == 64) {
1710                         memcpy(&addr, &pinfo->prefix, 8);
1711                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1712                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1713                                 in6_dev_put(in6_dev);
1714                                 return;
1715                         }
1716                         goto ok;
1717                 }
1718                 if (net_ratelimit())
1719                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1720                                pinfo->prefix_len);
1721                 in6_dev_put(in6_dev);
1722                 return;
1723
1724 ok:
1725
1726                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1727
1728                 if (ifp == NULL && valid_lft) {
1729                         int max_addresses = in6_dev->cnf.max_addresses;
1730                         u32 addr_flags = 0;
1731
1732 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1733                         if (in6_dev->cnf.optimistic_dad &&
1734                             !ipv6_devconf.forwarding)
1735                                 addr_flags = IFA_F_OPTIMISTIC;
1736 #endif
1737
1738                         /* Do not allow to create too much of autoconfigured
1739                          * addresses; this would be too easy way to crash kernel.
1740                          */
1741                         if (!max_addresses ||
1742                             ipv6_count_addresses(in6_dev) < max_addresses)
1743                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1744                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1745                                                     addr_flags);
1746
1747                         if (!ifp || IS_ERR(ifp)) {
1748                                 in6_dev_put(in6_dev);
1749                                 return;
1750                         }
1751
1752                         update_lft = create = 1;
1753                         ifp->cstamp = jiffies;
1754                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1755                 }
1756
1757                 if (ifp) {
1758                         int flags;
1759                         unsigned long now;
1760 #ifdef CONFIG_IPV6_PRIVACY
1761                         struct inet6_ifaddr *ift;
1762 #endif
1763                         u32 stored_lft;
1764
1765                         /* update lifetime (RFC2462 5.5.3 e) */
1766                         spin_lock(&ifp->lock);
1767                         now = jiffies;
1768                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1769                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1770                         else
1771                                 stored_lft = 0;
1772                         if (!update_lft && stored_lft) {
1773                                 if (valid_lft > MIN_VALID_LIFETIME ||
1774                                     valid_lft > stored_lft)
1775                                         update_lft = 1;
1776                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1777                                         /* valid_lft <= stored_lft is always true */
1778                                         /* XXX: IPsec */
1779                                         update_lft = 0;
1780                                 } else {
1781                                         valid_lft = MIN_VALID_LIFETIME;
1782                                         if (valid_lft < prefered_lft)
1783                                                 prefered_lft = valid_lft;
1784                                         update_lft = 1;
1785                                 }
1786                         }
1787
1788                         if (update_lft) {
1789                                 ifp->valid_lft = valid_lft;
1790                                 ifp->prefered_lft = prefered_lft;
1791                                 ifp->tstamp = now;
1792                                 flags = ifp->flags;
1793                                 ifp->flags &= ~IFA_F_DEPRECATED;
1794                                 spin_unlock(&ifp->lock);
1795
1796                                 if (!(flags&IFA_F_TENTATIVE))
1797                                         ipv6_ifa_notify(0, ifp);
1798                         } else
1799                                 spin_unlock(&ifp->lock);
1800
1801 #ifdef CONFIG_IPV6_PRIVACY
1802                         read_lock_bh(&in6_dev->lock);
1803                         /* update all temporary addresses in the list */
1804                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1805                                 /*
1806                                  * When adjusting the lifetimes of an existing
1807                                  * temporary address, only lower the lifetimes.
1808                                  * Implementations must not increase the
1809                                  * lifetimes of an existing temporary address
1810                                  * when processing a Prefix Information Option.
1811                                  */
1812                                 spin_lock(&ift->lock);
1813                                 flags = ift->flags;
1814                                 if (ift->valid_lft > valid_lft &&
1815                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1816                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1817                                 if (ift->prefered_lft > prefered_lft &&
1818                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1819                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1820                                 spin_unlock(&ift->lock);
1821                                 if (!(flags&IFA_F_TENTATIVE))
1822                                         ipv6_ifa_notify(0, ift);
1823                         }
1824
1825                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1826                                 /*
1827                                  * When a new public address is created as described in [ADDRCONF],
1828                                  * also create a new temporary address.
1829                                  */
1830                                 read_unlock_bh(&in6_dev->lock);
1831                                 ipv6_create_tempaddr(ifp, NULL);
1832                         } else {
1833                                 read_unlock_bh(&in6_dev->lock);
1834                         }
1835 #endif
1836                         in6_ifa_put(ifp);
1837                         addrconf_verify(0);
1838                 }
1839         }
1840         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1841         in6_dev_put(in6_dev);
1842 }
1843
1844 /*
1845  *      Set destination address.
1846  *      Special case for SIT interfaces where we create a new "virtual"
1847  *      device.
1848  */
1849 int addrconf_set_dstaddr(void __user *arg)
1850 {
1851         struct in6_ifreq ireq;
1852         struct net_device *dev;
1853         int err = -EINVAL;
1854
1855         rtnl_lock();
1856
1857         err = -EFAULT;
1858         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1859                 goto err_exit;
1860
1861         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1862
1863         err = -ENODEV;
1864         if (dev == NULL)
1865                 goto err_exit;
1866
1867 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1868         if (dev->type == ARPHRD_SIT) {
1869                 struct ifreq ifr;
1870                 mm_segment_t    oldfs;
1871                 struct ip_tunnel_parm p;
1872
1873                 err = -EADDRNOTAVAIL;
1874                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1875                         goto err_exit;
1876
1877                 memset(&p, 0, sizeof(p));
1878                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1879                 p.iph.saddr = 0;
1880                 p.iph.version = 4;
1881                 p.iph.ihl = 5;
1882                 p.iph.protocol = IPPROTO_IPV6;
1883                 p.iph.ttl = 64;
1884                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1885
1886                 oldfs = get_fs(); set_fs(KERNEL_DS);
1887                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1888                 set_fs(oldfs);
1889
1890                 if (err == 0) {
1891                         err = -ENOBUFS;
1892                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1893                                 goto err_exit;
1894                         err = dev_open(dev);
1895                 }
1896         }
1897 #endif
1898
1899 err_exit:
1900         rtnl_unlock();
1901         return err;
1902 }
1903
1904 /*
1905  *      Manual configuration of address on an interface
1906  */
1907 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1908                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1909 {
1910         struct inet6_ifaddr *ifp;
1911         struct inet6_dev *idev;
1912         struct net_device *dev;
1913         int scope;
1914         u32 flags = RTF_EXPIRES;
1915
1916         ASSERT_RTNL();
1917
1918         /* check the lifetime */
1919         if (!valid_lft || prefered_lft > valid_lft)
1920                 return -EINVAL;
1921
1922         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1923                 return -ENODEV;
1924
1925         if ((idev = addrconf_add_dev(dev)) == NULL)
1926                 return -ENOBUFS;
1927
1928         scope = ipv6_addr_scope(pfx);
1929
1930         if (valid_lft == INFINITY_LIFE_TIME) {
1931                 ifa_flags |= IFA_F_PERMANENT;
1932                 flags = 0;
1933         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1934                 valid_lft = 0x7FFFFFFF/HZ;
1935
1936         if (prefered_lft == 0)
1937                 ifa_flags |= IFA_F_DEPRECATED;
1938         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1939                  (prefered_lft != INFINITY_LIFE_TIME))
1940                 prefered_lft = 0x7FFFFFFF/HZ;
1941
1942         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1943
1944         if (!IS_ERR(ifp)) {
1945                 spin_lock_bh(&ifp->lock);
1946                 ifp->valid_lft = valid_lft;
1947                 ifp->prefered_lft = prefered_lft;
1948                 ifp->tstamp = jiffies;
1949                 spin_unlock_bh(&ifp->lock);
1950
1951                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1952                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1953                 /*
1954                  * Note that section 3.1 of RFC 4429 indicates
1955                  * that the Optimistic flag should not be set for
1956                  * manually configured addresses
1957                  */
1958                 addrconf_dad_start(ifp, 0);
1959                 in6_ifa_put(ifp);
1960                 addrconf_verify(0);
1961                 return 0;
1962         }
1963
1964         return PTR_ERR(ifp);
1965 }
1966
1967 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1968 {
1969         struct inet6_ifaddr *ifp;
1970         struct inet6_dev *idev;
1971         struct net_device *dev;
1972
1973         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1974                 return -ENODEV;
1975
1976         if ((idev = __in6_dev_get(dev)) == NULL)
1977                 return -ENXIO;
1978
1979         read_lock_bh(&idev->lock);
1980         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1981                 if (ifp->prefix_len == plen &&
1982                     ipv6_addr_equal(pfx, &ifp->addr)) {
1983                         in6_ifa_hold(ifp);
1984                         read_unlock_bh(&idev->lock);
1985
1986                         ipv6_del_addr(ifp);
1987
1988                         /* If the last address is deleted administratively,
1989                            disable IPv6 on this interface.
1990                          */
1991                         if (idev->addr_list == NULL)
1992                                 addrconf_ifdown(idev->dev, 1);
1993                         return 0;
1994                 }
1995         }
1996         read_unlock_bh(&idev->lock);
1997         return -EADDRNOTAVAIL;
1998 }
1999
2000
2001 int addrconf_add_ifaddr(void __user *arg)
2002 {
2003         struct in6_ifreq ireq;
2004         int err;
2005
2006         if (!capable(CAP_NET_ADMIN))
2007                 return -EPERM;
2008
2009         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2010                 return -EFAULT;
2011
2012         rtnl_lock();
2013         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2014                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2015         rtnl_unlock();
2016         return err;
2017 }
2018
2019 int addrconf_del_ifaddr(void __user *arg)
2020 {
2021         struct in6_ifreq ireq;
2022         int err;
2023
2024         if (!capable(CAP_NET_ADMIN))
2025                 return -EPERM;
2026
2027         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2028                 return -EFAULT;
2029
2030         rtnl_lock();
2031         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2032         rtnl_unlock();
2033         return err;
2034 }
2035
2036 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2037 static void sit_add_v4_addrs(struct inet6_dev *idev)
2038 {
2039         struct inet6_ifaddr * ifp;
2040         struct in6_addr addr;
2041         struct net_device *dev;
2042         int scope;
2043
2044         ASSERT_RTNL();
2045
2046         memset(&addr, 0, sizeof(struct in6_addr));
2047         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2048
2049         if (idev->dev->flags&IFF_POINTOPOINT) {
2050                 addr.s6_addr32[0] = htonl(0xfe800000);
2051                 scope = IFA_LINK;
2052         } else {
2053                 scope = IPV6_ADDR_COMPATv4;
2054         }
2055
2056         if (addr.s6_addr32[3]) {
2057                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2058                 if (!IS_ERR(ifp)) {
2059                         spin_lock_bh(&ifp->lock);
2060                         ifp->flags &= ~IFA_F_TENTATIVE;
2061                         spin_unlock_bh(&ifp->lock);
2062                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2063                         in6_ifa_put(ifp);
2064                 }
2065                 return;
2066         }
2067
2068         for_each_netdev(dev) {
2069                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2070                 if (in_dev && (dev->flags & IFF_UP)) {
2071                         struct in_ifaddr * ifa;
2072
2073                         int flag = scope;
2074
2075                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2076                                 int plen;
2077
2078                                 addr.s6_addr32[3] = ifa->ifa_local;
2079
2080                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2081                                         continue;
2082                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2083                                         if (idev->dev->flags&IFF_POINTOPOINT)
2084                                                 continue;
2085                                         flag |= IFA_HOST;
2086                                 }
2087                                 if (idev->dev->flags&IFF_POINTOPOINT)
2088                                         plen = 64;
2089                                 else
2090                                         plen = 96;
2091
2092                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2093                                                     IFA_F_PERMANENT);
2094                                 if (!IS_ERR(ifp)) {
2095                                         spin_lock_bh(&ifp->lock);
2096                                         ifp->flags &= ~IFA_F_TENTATIVE;
2097                                         spin_unlock_bh(&ifp->lock);
2098                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2099                                         in6_ifa_put(ifp);
2100                                 }
2101                         }
2102                 }
2103         }
2104 }
2105 #endif
2106
2107 static void init_loopback(struct net_device *dev)
2108 {
2109         struct inet6_dev  *idev;
2110         struct inet6_ifaddr * ifp;
2111
2112         /* ::1 */
2113
2114         ASSERT_RTNL();
2115
2116         if ((idev = ipv6_find_idev(dev)) == NULL) {
2117                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2118                 return;
2119         }
2120
2121         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2122         if (!IS_ERR(ifp)) {
2123                 spin_lock_bh(&ifp->lock);
2124                 ifp->flags &= ~IFA_F_TENTATIVE;
2125                 spin_unlock_bh(&ifp->lock);
2126                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2127                 in6_ifa_put(ifp);
2128         }
2129 }
2130
2131 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2132 {
2133         struct inet6_ifaddr * ifp;
2134         u32 addr_flags = IFA_F_PERMANENT;
2135
2136 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2137         if (idev->cnf.optimistic_dad &&
2138             !ipv6_devconf.forwarding)
2139                 addr_flags |= IFA_F_OPTIMISTIC;
2140 #endif
2141
2142
2143         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2144         if (!IS_ERR(ifp)) {
2145                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2146                 addrconf_dad_start(ifp, 0);
2147                 in6_ifa_put(ifp);
2148         }
2149 }
2150
2151 static void addrconf_dev_config(struct net_device *dev)
2152 {
2153         struct in6_addr addr;
2154         struct inet6_dev    * idev;
2155
2156         ASSERT_RTNL();
2157
2158         if ((dev->type != ARPHRD_ETHER) &&
2159             (dev->type != ARPHRD_FDDI) &&
2160             (dev->type != ARPHRD_IEEE802_TR) &&
2161             (dev->type != ARPHRD_ARCNET) &&
2162             (dev->type != ARPHRD_INFINIBAND)) {
2163                 /* Alas, we support only Ethernet autoconfiguration. */
2164                 return;
2165         }
2166
2167         idev = addrconf_add_dev(dev);
2168         if (idev == NULL)
2169                 return;
2170
2171         memset(&addr, 0, sizeof(struct in6_addr));
2172         addr.s6_addr32[0] = htonl(0xFE800000);
2173
2174         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2175                 addrconf_add_linklocal(idev, &addr);
2176 }
2177
2178 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2179 static void addrconf_sit_config(struct net_device *dev)
2180 {
2181         struct inet6_dev *idev;
2182
2183         ASSERT_RTNL();
2184
2185         /*
2186          * Configure the tunnel with one of our IPv4
2187          * addresses... we should configure all of
2188          * our v4 addrs in the tunnel
2189          */
2190
2191         if ((idev = ipv6_find_idev(dev)) == NULL) {
2192                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2193                 return;
2194         }
2195
2196         sit_add_v4_addrs(idev);
2197
2198         if (dev->flags&IFF_POINTOPOINT) {
2199                 addrconf_add_mroute(dev);
2200                 addrconf_add_lroute(dev);
2201         } else
2202                 sit_route_add(dev);
2203 }
2204 #endif
2205
2206 static inline int
2207 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2208 {
2209         struct in6_addr lladdr;
2210
2211         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2212                 addrconf_add_linklocal(idev, &lladdr);
2213                 return 0;
2214         }
2215         return -1;
2216 }
2217
2218 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2219 {
2220         struct net_device *link_dev;
2221
2222         /* first try to inherit the link-local address from the link device */
2223         if (idev->dev->iflink &&
2224             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2225                 if (!ipv6_inherit_linklocal(idev, link_dev))
2226                         return;
2227         }
2228         /* then try to inherit it from any device */
2229         for_each_netdev(link_dev) {
2230                 if (!ipv6_inherit_linklocal(idev, link_dev))
2231                         return;
2232         }
2233         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2234 }
2235
2236 /*
2237  * Autoconfigure tunnel with a link-local address so routing protocols,
2238  * DHCPv6, MLD etc. can be run over the virtual link
2239  */
2240
2241 static void addrconf_ip6_tnl_config(struct net_device *dev)
2242 {
2243         struct inet6_dev *idev;
2244
2245         ASSERT_RTNL();
2246
2247         if ((idev = addrconf_add_dev(dev)) == NULL) {
2248                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2249                 return;
2250         }
2251         ip6_tnl_add_linklocal(idev);
2252 }
2253
2254 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2255                            void * data)
2256 {
2257         struct net_device *dev = (struct net_device *) data;
2258         struct inet6_dev *idev = __in6_dev_get(dev);
2259         int run_pending = 0;
2260         int err;
2261
2262         if (dev->nd_net != &init_net)
2263                 return NOTIFY_DONE;
2264
2265         switch(event) {
2266         case NETDEV_REGISTER:
2267                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2268                         idev = ipv6_add_dev(dev);
2269                         if (!idev)
2270                                 return notifier_from_errno(-ENOMEM);
2271                 }
2272                 break;
2273         case NETDEV_UP:
2274         case NETDEV_CHANGE:
2275                 if (dev->flags & IFF_SLAVE)
2276                         break;
2277
2278                 if (event == NETDEV_UP) {
2279                         if (!netif_carrier_ok(dev)) {
2280                                 /* device is not ready yet. */
2281                                 printk(KERN_INFO
2282                                         "ADDRCONF(NETDEV_UP): %s: "
2283                                         "link is not ready\n",
2284                                         dev->name);
2285                                 break;
2286                         }
2287
2288                         if (idev)
2289                                 idev->if_flags |= IF_READY;
2290                 } else {
2291                         if (!netif_carrier_ok(dev)) {
2292                                 /* device is still not ready. */
2293                                 break;
2294                         }
2295
2296                         if (idev) {
2297                                 if (idev->if_flags & IF_READY) {
2298                                         /* device is already configured. */
2299                                         break;
2300                                 }
2301                                 idev->if_flags |= IF_READY;
2302                         }
2303
2304                         printk(KERN_INFO
2305                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2306                                         "link becomes ready\n",
2307                                         dev->name);
2308
2309                         run_pending = 1;
2310                 }
2311
2312                 switch(dev->type) {
2313 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2314                 case ARPHRD_SIT:
2315                         addrconf_sit_config(dev);
2316                         break;
2317 #endif
2318                 case ARPHRD_TUNNEL6:
2319                         addrconf_ip6_tnl_config(dev);
2320                         break;
2321                 case ARPHRD_LOOPBACK:
2322                         init_loopback(dev);
2323                         break;
2324
2325                 default:
2326                         addrconf_dev_config(dev);
2327                         break;
2328                 }
2329                 if (idev) {
2330                         if (run_pending)
2331                                 addrconf_dad_run(idev);
2332
2333                         /* If the MTU changed during the interface down, when the
2334                            interface up, the changed MTU must be reflected in the
2335                            idev as well as routers.
2336                          */
2337                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2338                                 rt6_mtu_change(dev, dev->mtu);
2339                                 idev->cnf.mtu6 = dev->mtu;
2340                         }
2341                         idev->tstamp = jiffies;
2342                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2343                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2344                            stop IPv6 on this interface.
2345                          */
2346                         if (dev->mtu < IPV6_MIN_MTU)
2347                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2348                 }
2349                 break;
2350
2351         case NETDEV_CHANGEMTU:
2352                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2353                         rt6_mtu_change(dev, dev->mtu);
2354                         idev->cnf.mtu6 = dev->mtu;
2355                         break;
2356                 }
2357
2358                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2359
2360         case NETDEV_DOWN:
2361         case NETDEV_UNREGISTER:
2362                 /*
2363                  *      Remove all addresses from this interface.
2364                  */
2365                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2366                 break;
2367
2368         case NETDEV_CHANGENAME:
2369                 if (idev) {
2370                         snmp6_unregister_dev(idev);
2371 #ifdef CONFIG_SYSCTL
2372                         addrconf_sysctl_unregister(&idev->cnf);
2373                         neigh_sysctl_unregister(idev->nd_parms);
2374                         neigh_sysctl_register(dev, idev->nd_parms,
2375                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2376                                               &ndisc_ifinfo_sysctl_change,
2377                                               NULL);
2378                         addrconf_sysctl_register(idev, &idev->cnf);
2379 #endif
2380                         err = snmp6_register_dev(idev);
2381                         if (err)
2382                                 return notifier_from_errno(err);
2383                 }
2384                 break;
2385         }
2386
2387         return NOTIFY_OK;
2388 }
2389
2390 /*
2391  *      addrconf module should be notified of a device going up
2392  */
2393 static struct notifier_block ipv6_dev_notf = {
2394         .notifier_call = addrconf_notify,
2395         .priority = 0
2396 };
2397
2398 static int addrconf_ifdown(struct net_device *dev, int how)
2399 {
2400         struct inet6_dev *idev;
2401         struct inet6_ifaddr *ifa, **bifa;
2402         int i;
2403
2404         ASSERT_RTNL();
2405
2406         if (dev == &loopback_dev && how == 1)
2407                 how = 0;
2408
2409         rt6_ifdown(dev);
2410         neigh_ifdown(&nd_tbl, dev);
2411
2412         idev = __in6_dev_get(dev);
2413         if (idev == NULL)
2414                 return -ENODEV;
2415
2416         /* Step 1: remove reference to ipv6 device from parent device.
2417                    Do not dev_put!
2418          */
2419         if (how == 1) {
2420                 idev->dead = 1;
2421
2422                 /* protected by rtnl_lock */
2423                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2424
2425                 /* Step 1.5: remove snmp6 entry */
2426                 snmp6_unregister_dev(idev);
2427
2428         }
2429
2430         /* Step 2: clear hash table */
2431         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2432                 bifa = &inet6_addr_lst[i];
2433
2434                 write_lock_bh(&addrconf_hash_lock);
2435                 while ((ifa = *bifa) != NULL) {
2436                         if (ifa->idev == idev) {
2437                                 *bifa = ifa->lst_next;
2438                                 ifa->lst_next = NULL;
2439                                 addrconf_del_timer(ifa);
2440                                 in6_ifa_put(ifa);
2441                                 continue;
2442                         }
2443                         bifa = &ifa->lst_next;
2444                 }
2445                 write_unlock_bh(&addrconf_hash_lock);
2446         }
2447
2448         write_lock_bh(&idev->lock);
2449
2450         /* Step 3: clear flags for stateless addrconf */
2451         if (how != 1)
2452                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2453
2454         /* Step 4: clear address list */
2455 #ifdef CONFIG_IPV6_PRIVACY
2456         if (how == 1 && del_timer(&idev->regen_timer))
2457                 in6_dev_put(idev);
2458
2459         /* clear tempaddr list */
2460         while ((ifa = idev->tempaddr_list) != NULL) {
2461                 idev->tempaddr_list = ifa->tmp_next;
2462                 ifa->tmp_next = NULL;
2463                 ifa->dead = 1;
2464                 write_unlock_bh(&idev->lock);
2465                 spin_lock_bh(&ifa->lock);
2466
2467                 if (ifa->ifpub) {
2468                         in6_ifa_put(ifa->ifpub);
2469                         ifa->ifpub = NULL;
2470                 }
2471                 spin_unlock_bh(&ifa->lock);
2472                 in6_ifa_put(ifa);
2473                 write_lock_bh(&idev->lock);
2474         }
2475 #endif
2476         while ((ifa = idev->addr_list) != NULL) {
2477                 idev->addr_list = ifa->if_next;
2478                 ifa->if_next = NULL;
2479                 ifa->dead = 1;
2480                 addrconf_del_timer(ifa);
2481                 write_unlock_bh(&idev->lock);
2482
2483                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2484                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2485                 in6_ifa_put(ifa);
2486
2487                 write_lock_bh(&idev->lock);
2488         }
2489         write_unlock_bh(&idev->lock);
2490
2491         /* Step 5: Discard multicast list */
2492
2493         if (how == 1)
2494                 ipv6_mc_destroy_dev(idev);
2495         else
2496                 ipv6_mc_down(idev);
2497
2498         /* Step 5: netlink notification of this interface */
2499         idev->tstamp = jiffies;
2500         inet6_ifinfo_notify(RTM_DELLINK, idev);
2501
2502         /* Shot the device (if unregistered) */
2503
2504         if (how == 1) {
2505 #ifdef CONFIG_SYSCTL
2506                 addrconf_sysctl_unregister(&idev->cnf);
2507                 neigh_sysctl_unregister(idev->nd_parms);
2508 #endif
2509                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2510                 neigh_ifdown(&nd_tbl, dev);
2511                 in6_dev_put(idev);
2512         }
2513         return 0;
2514 }
2515
2516 static void addrconf_rs_timer(unsigned long data)
2517 {
2518         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2519
2520         if (ifp->idev->cnf.forwarding)
2521                 goto out;
2522
2523         if (ifp->idev->if_flags & IF_RA_RCVD) {
2524                 /*
2525                  *      Announcement received after solicitation
2526                  *      was sent
2527                  */
2528                 goto out;
2529         }
2530
2531         spin_lock(&ifp->lock);
2532         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2533                 struct in6_addr all_routers;
2534
2535                 /* The wait after the last probe can be shorter */
2536                 addrconf_mod_timer(ifp, AC_RS,
2537                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2538                                    ifp->idev->cnf.rtr_solicit_delay :
2539                                    ifp->idev->cnf.rtr_solicit_interval);
2540                 spin_unlock(&ifp->lock);
2541
2542                 ipv6_addr_all_routers(&all_routers);
2543
2544                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2545         } else {
2546                 spin_unlock(&ifp->lock);
2547                 /*
2548                  * Note: we do not support deprecated "all on-link"
2549                  * assumption any longer.
2550                  */
2551                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2552                        ifp->idev->dev->name);
2553         }
2554
2555 out:
2556         in6_ifa_put(ifp);
2557 }
2558
2559 /*
2560  *      Duplicate Address Detection
2561  */
2562 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2563 {
2564         unsigned long rand_num;
2565         struct inet6_dev *idev = ifp->idev;
2566
2567         if (ifp->flags & IFA_F_OPTIMISTIC)
2568                 rand_num = 0;
2569         else
2570                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2571
2572         ifp->probes = idev->cnf.dad_transmits;
2573         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2574 }
2575
2576 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2577 {
2578         struct inet6_dev *idev = ifp->idev;
2579         struct net_device *dev = idev->dev;
2580
2581         addrconf_join_solict(dev, &ifp->addr);
2582
2583         net_srandom(ifp->addr.s6_addr32[3]);
2584
2585         read_lock_bh(&idev->lock);
2586         if (ifp->dead)
2587                 goto out;
2588         spin_lock_bh(&ifp->lock);
2589
2590         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2591             !(ifp->flags&IFA_F_TENTATIVE) ||
2592             ifp->flags & IFA_F_NODAD) {
2593                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2594                 spin_unlock_bh(&ifp->lock);
2595                 read_unlock_bh(&idev->lock);
2596
2597                 addrconf_dad_completed(ifp);
2598                 return;
2599         }
2600
2601         if (!(idev->if_flags & IF_READY)) {
2602                 spin_unlock_bh(&ifp->lock);
2603                 read_unlock_bh(&idev->lock);
2604                 /*
2605                  * If the defice is not ready:
2606                  * - keep it tentative if it is a permanent address.
2607                  * - otherwise, kill it.
2608                  */
2609                 in6_ifa_hold(ifp);
2610                 addrconf_dad_stop(ifp);
2611                 return;
2612         }
2613
2614         /*
2615          * Optimistic nodes can start receiving
2616          * Frames right away
2617          */
2618         if(ifp->flags & IFA_F_OPTIMISTIC)
2619                 ip6_ins_rt(ifp->rt);
2620
2621         addrconf_dad_kick(ifp);
2622         spin_unlock_bh(&ifp->lock);
2623 out:
2624         read_unlock_bh(&idev->lock);
2625 }
2626
2627 static void addrconf_dad_timer(unsigned long data)
2628 {
2629         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2630         struct inet6_dev *idev = ifp->idev;
2631         struct in6_addr unspec;
2632         struct in6_addr mcaddr;
2633
2634         read_lock_bh(&idev->lock);
2635         if (idev->dead) {
2636                 read_unlock_bh(&idev->lock);
2637                 goto out;
2638         }
2639         spin_lock_bh(&ifp->lock);
2640         if (ifp->probes == 0) {
2641                 /*
2642                  * DAD was successful
2643                  */
2644
2645                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2646                 spin_unlock_bh(&ifp->lock);
2647                 read_unlock_bh(&idev->lock);
2648
2649                 addrconf_dad_completed(ifp);
2650
2651                 goto out;
2652         }
2653
2654         ifp->probes--;
2655         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2656         spin_unlock_bh(&ifp->lock);
2657         read_unlock_bh(&idev->lock);
2658
2659         /* send a neighbour solicitation for our addr */
2660         memset(&unspec, 0, sizeof(unspec));
2661         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2662         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2663 out:
2664         in6_ifa_put(ifp);
2665 }
2666
2667 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2668 {
2669         struct net_device *     dev = ifp->idev->dev;
2670
2671         /*
2672          *      Configure the address for reception. Now it is valid.
2673          */
2674
2675         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2676
2677         /* If added prefix is link local and forwarding is off,
2678            start sending router solicitations.
2679          */
2680
2681         if (ifp->idev->cnf.forwarding == 0 &&
2682             ifp->idev->cnf.rtr_solicits > 0 &&
2683             (dev->flags&IFF_LOOPBACK) == 0 &&
2684             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2685                 struct in6_addr all_routers;
2686
2687                 ipv6_addr_all_routers(&all_routers);
2688
2689                 /*
2690                  *      If a host as already performed a random delay
2691                  *      [...] as part of DAD [...] there is no need
2692                  *      to delay again before sending the first RS
2693                  */
2694                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2695
2696                 spin_lock_bh(&ifp->lock);
2697                 ifp->probes = 1;
2698                 ifp->idev->if_flags |= IF_RS_SENT;
2699                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2700                 spin_unlock_bh(&ifp->lock);
2701         }
2702 }
2703
2704 static void addrconf_dad_run(struct inet6_dev *idev) {
2705         struct inet6_ifaddr *ifp;
2706
2707         read_lock_bh(&idev->lock);
2708         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2709                 spin_lock_bh(&ifp->lock);
2710                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2711                         spin_unlock_bh(&ifp->lock);
2712                         continue;
2713                 }
2714                 spin_unlock_bh(&ifp->lock);
2715                 addrconf_dad_kick(ifp);
2716         }
2717         read_unlock_bh(&idev->lock);
2718 }
2719
2720 #ifdef CONFIG_PROC_FS
2721 struct if6_iter_state {
2722         int bucket;
2723 };
2724
2725 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2726 {
2727         struct inet6_ifaddr *ifa = NULL;
2728         struct if6_iter_state *state = seq->private;
2729
2730         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2731                 ifa = inet6_addr_lst[state->bucket];
2732                 if (ifa)
2733                         break;
2734         }
2735         return ifa;
2736 }
2737
2738 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2739 {
2740         struct if6_iter_state *state = seq->private;
2741
2742         ifa = ifa->lst_next;
2743 try_again:
2744         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2745                 ifa = inet6_addr_lst[state->bucket];
2746                 goto try_again;
2747         }
2748         return ifa;
2749 }
2750
2751 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2752 {
2753         struct inet6_ifaddr *ifa = if6_get_first(seq);
2754
2755         if (ifa)
2756                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2757                         --pos;
2758         return pos ? NULL : ifa;
2759 }
2760
2761 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2762 {
2763         read_lock_bh(&addrconf_hash_lock);
2764         return if6_get_idx(seq, *pos);
2765 }
2766
2767 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2768 {
2769         struct inet6_ifaddr *ifa;
2770
2771         ifa = if6_get_next(seq, v);
2772         ++*pos;
2773         return ifa;
2774 }
2775
2776 static void if6_seq_stop(struct seq_file *seq, void *v)
2777 {
2778         read_unlock_bh(&addrconf_hash_lock);
2779 }
2780
2781 static int if6_seq_show(struct seq_file *seq, void *v)
2782 {
2783         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2784         seq_printf(seq,
2785                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2786                    NIP6(ifp->addr),
2787                    ifp->idev->dev->ifindex,
2788                    ifp->prefix_len,
2789                    ifp->scope,
2790                    ifp->flags,
2791                    ifp->idev->dev->name);
2792         return 0;
2793 }
2794
2795 static const struct seq_operations if6_seq_ops = {
2796         .start  = if6_seq_start,
2797         .next   = if6_seq_next,
2798         .show   = if6_seq_show,
2799         .stop   = if6_seq_stop,
2800 };
2801
2802 static int if6_seq_open(struct inode *inode, struct file *file)
2803 {
2804         struct seq_file *seq;
2805         int rc = -ENOMEM;
2806         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2807
2808         if (!s)
2809                 goto out;
2810
2811         rc = seq_open(file, &if6_seq_ops);
2812         if (rc)
2813                 goto out_kfree;
2814
2815         seq = file->private_data;
2816         seq->private = s;
2817 out:
2818         return rc;
2819 out_kfree:
2820         kfree(s);
2821         goto out;
2822 }
2823
2824 static const struct file_operations if6_fops = {
2825         .owner          = THIS_MODULE,
2826         .open           = if6_seq_open,
2827         .read           = seq_read,
2828         .llseek         = seq_lseek,
2829         .release        = seq_release_private,
2830 };
2831
2832 int __init if6_proc_init(void)
2833 {
2834         if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2835                 return -ENOMEM;
2836         return 0;
2837 }
2838
2839 void if6_proc_exit(void)
2840 {
2841         proc_net_remove(&init_net, "if_inet6");
2842 }
2843 #endif  /* CONFIG_PROC_FS */
2844
2845 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2846 /* Check if address is a home address configured on any interface. */
2847 int ipv6_chk_home_addr(struct in6_addr *addr)
2848 {
2849         int ret = 0;
2850         struct inet6_ifaddr * ifp;
2851         u8 hash = ipv6_addr_hash(addr);
2852         read_lock_bh(&addrconf_hash_lock);
2853         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2854                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2855                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2856                         ret = 1;
2857                         break;
2858                 }
2859         }
2860         read_unlock_bh(&addrconf_hash_lock);
2861         return ret;
2862 }
2863 #endif
2864
2865 /*
2866  *      Periodic address status verification
2867  */
2868
2869 static void addrconf_verify(unsigned long foo)
2870 {
2871         struct inet6_ifaddr *ifp;
2872         unsigned long now, next;
2873         int i;
2874
2875         spin_lock_bh(&addrconf_verify_lock);
2876         now = jiffies;
2877         next = now + ADDR_CHECK_FREQUENCY;
2878
2879         del_timer(&addr_chk_timer);
2880
2881         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2882
2883 restart:
2884                 read_lock(&addrconf_hash_lock);
2885                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2886                         unsigned long age;
2887 #ifdef CONFIG_IPV6_PRIVACY
2888                         unsigned long regen_advance;
2889 #endif
2890
2891                         if (ifp->flags & IFA_F_PERMANENT)
2892                                 continue;
2893
2894                         spin_lock(&ifp->lock);
2895                         age = (now - ifp->tstamp) / HZ;
2896
2897 #ifdef CONFIG_IPV6_PRIVACY
2898                         regen_advance = ifp->idev->cnf.regen_max_retry *
2899                                         ifp->idev->cnf.dad_transmits *
2900                                         ifp->idev->nd_parms->retrans_time / HZ;
2901 #endif
2902
2903                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2904                             age >= ifp->valid_lft) {
2905                                 spin_unlock(&ifp->lock);
2906                                 in6_ifa_hold(ifp);
2907                                 read_unlock(&addrconf_hash_lock);
2908                                 ipv6_del_addr(ifp);
2909                                 goto restart;
2910                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2911                                 spin_unlock(&ifp->lock);
2912                                 continue;
2913                         } else if (age >= ifp->prefered_lft) {
2914                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2915                                 int deprecate = 0;
2916
2917                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2918                                         deprecate = 1;
2919                                         ifp->flags |= IFA_F_DEPRECATED;
2920                                 }
2921
2922                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2923                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2924
2925                                 spin_unlock(&ifp->lock);
2926
2927                                 if (deprecate) {
2928                                         in6_ifa_hold(ifp);
2929                                         read_unlock(&addrconf_hash_lock);
2930
2931                                         ipv6_ifa_notify(0, ifp);
2932                                         in6_ifa_put(ifp);
2933                                         goto restart;
2934                                 }
2935 #ifdef CONFIG_IPV6_PRIVACY
2936                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2937                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2938                                 if (age >= ifp->prefered_lft - regen_advance) {
2939                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2940                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2941                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2942                                         if (!ifp->regen_count && ifpub) {
2943                                                 ifp->regen_count++;
2944                                                 in6_ifa_hold(ifp);
2945                                                 in6_ifa_hold(ifpub);
2946                                                 spin_unlock(&ifp->lock);
2947                                                 read_unlock(&addrconf_hash_lock);
2948                                                 spin_lock(&ifpub->lock);
2949                                                 ifpub->regen_count = 0;
2950                                                 spin_unlock(&ifpub->lock);
2951                                                 ipv6_create_tempaddr(ifpub, ifp);
2952                                                 in6_ifa_put(ifpub);
2953                                                 in6_ifa_put(ifp);
2954                                                 goto restart;
2955                                         }
2956                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2957                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2958                                 spin_unlock(&ifp->lock);
2959 #endif
2960                         } else {
2961                                 /* ifp->prefered_lft <= ifp->valid_lft */
2962                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2963                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2964                                 spin_unlock(&ifp->lock);
2965                         }
2966                 }
2967                 read_unlock(&addrconf_hash_lock);
2968         }
2969
2970         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2971         add_timer(&addr_chk_timer);
2972         spin_unlock_bh(&addrconf_verify_lock);
2973 }
2974
2975 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2976 {
2977         struct in6_addr *pfx = NULL;
2978
2979         if (addr)
2980                 pfx = nla_data(addr);
2981
2982         if (local) {
2983                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2984                         pfx = NULL;
2985                 else
2986                         pfx = nla_data(local);
2987         }
2988
2989         return pfx;
2990 }
2991
2992 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2993         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2994         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2995         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2996 };
2997
2998 static int
2999 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3000 {
3001         struct ifaddrmsg *ifm;
3002         struct nlattr *tb[IFA_MAX+1];
3003         struct in6_addr *pfx;
3004         int err;
3005
3006         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3007         if (err < 0)
3008                 return err;
3009
3010         ifm = nlmsg_data(nlh);
3011         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3012         if (pfx == NULL)
3013                 return -EINVAL;
3014
3015         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3016 }
3017
3018 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3019                              u32 prefered_lft, u32 valid_lft)
3020 {
3021         u32 flags = RTF_EXPIRES;
3022
3023         if (!valid_lft || (prefered_lft > valid_lft))
3024                 return -EINVAL;
3025
3026         if (valid_lft == INFINITY_LIFE_TIME) {
3027                 ifa_flags |= IFA_F_PERMANENT;
3028                 flags = 0;
3029         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3030                 valid_lft = 0x7FFFFFFF/HZ;
3031
3032         if (prefered_lft == 0)
3033                 ifa_flags |= IFA_F_DEPRECATED;
3034         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3035                  (prefered_lft != INFINITY_LIFE_TIME))
3036                 prefered_lft = 0x7FFFFFFF/HZ;
3037
3038         spin_lock_bh(&ifp->lock);
3039         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3040         ifp->tstamp = jiffies;
3041         ifp->valid_lft = valid_lft;
3042         ifp->prefered_lft = prefered_lft;
3043
3044         spin_unlock_bh(&ifp->lock);
3045         if (!(ifp->flags&IFA_F_TENTATIVE))
3046                 ipv6_ifa_notify(0, ifp);
3047
3048         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3049                               jiffies_to_clock_t(valid_lft * HZ), flags);
3050         addrconf_verify(0);
3051
3052         return 0;
3053 }
3054
3055 static int
3056 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3057 {
3058         struct ifaddrmsg *ifm;
3059         struct nlattr *tb[IFA_MAX+1];
3060         struct in6_addr *pfx;
3061         struct inet6_ifaddr *ifa;
3062         struct net_device *dev;
3063         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3064         u8 ifa_flags;
3065         int err;
3066
3067         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3068         if (err < 0)
3069                 return err;
3070
3071         ifm = nlmsg_data(nlh);
3072         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3073         if (pfx == NULL)
3074                 return -EINVAL;
3075
3076         if (tb[IFA_CACHEINFO]) {
3077                 struct ifa_cacheinfo *ci;
3078
3079                 ci = nla_data(tb[IFA_CACHEINFO]);
3080                 valid_lft = ci->ifa_valid;
3081                 preferred_lft = ci->ifa_prefered;
3082         } else {
3083                 preferred_lft = INFINITY_LIFE_TIME;
3084                 valid_lft = INFINITY_LIFE_TIME;
3085         }
3086
3087         dev =  __dev_get_by_index(ifm->ifa_index);
3088         if (dev == NULL)
3089                 return -ENODEV;
3090
3091         /* We ignore other flags so far. */
3092         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3093
3094         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3095         if (ifa == NULL) {
3096                 /*
3097                  * It would be best to check for !NLM_F_CREATE here but
3098                  * userspace alreay relies on not having to provide this.
3099                  */
3100                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3101                                       ifa_flags, preferred_lft, valid_lft);
3102         }
3103
3104         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3105             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3106                 err = -EEXIST;
3107         else
3108                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3109
3110         in6_ifa_put(ifa);
3111
3112         return err;
3113 }
3114
3115 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3116                           u8 scope, int ifindex)
3117 {
3118         struct ifaddrmsg *ifm;
3119
3120         ifm = nlmsg_data(nlh);
3121         ifm->ifa_family = AF_INET6;
3122         ifm->ifa_prefixlen = prefixlen;
3123         ifm->ifa_flags = flags;
3124         ifm->ifa_scope = scope;
3125         ifm->ifa_index = ifindex;
3126 }
3127
3128 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3129                          unsigned long tstamp, u32 preferred, u32 valid)
3130 {
3131         struct ifa_cacheinfo ci;
3132
3133         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3134                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3135         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3136                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3137         ci.ifa_prefered = preferred;
3138         ci.ifa_valid = valid;
3139
3140         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3141 }
3142
3143 static inline int rt_scope(int ifa_scope)
3144 {
3145         if (ifa_scope & IFA_HOST)
3146                 return RT_SCOPE_HOST;
3147         else if (ifa_scope & IFA_LINK)
3148                 return RT_SCOPE_LINK;
3149         else if (ifa_scope & IFA_SITE)
3150                 return RT_SCOPE_SITE;
3151         else
3152                 return RT_SCOPE_UNIVERSE;
3153 }
3154
3155 static inline int inet6_ifaddr_msgsize(void)
3156 {
3157         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3158                + nla_total_size(16) /* IFA_ADDRESS */
3159                + nla_total_size(sizeof(struct ifa_cacheinfo));
3160 }
3161
3162 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3163                              u32 pid, u32 seq, int event, unsigned int flags)
3164 {
3165         struct nlmsghdr  *nlh;
3166         u32 preferred, valid;
3167
3168         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3169         if (nlh == NULL)
3170                 return -EMSGSIZE;
3171
3172         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3173                       ifa->idev->dev->ifindex);
3174
3175         if (!(ifa->flags&IFA_F_PERMANENT)) {
3176                 preferred = ifa->prefered_lft;
3177                 valid = ifa->valid_lft;
3178                 if (preferred != INFINITY_LIFE_TIME) {
3179                         long tval = (jiffies - ifa->tstamp)/HZ;
3180                         preferred -= tval;
3181                         if (valid != INFINITY_LIFE_TIME)
3182                                 valid -= tval;
3183                 }
3184         } else {
3185                 preferred = INFINITY_LIFE_TIME;
3186                 valid = INFINITY_LIFE_TIME;
3187         }
3188
3189         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3190             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3191                 nlmsg_cancel(skb, nlh);
3192                 return -EMSGSIZE;
3193         }
3194
3195         return nlmsg_end(skb, nlh);
3196 }
3197
3198 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3199                                 u32 pid, u32 seq, int event, u16 flags)
3200 {
3201         struct nlmsghdr  *nlh;
3202         u8 scope = RT_SCOPE_UNIVERSE;
3203         int ifindex = ifmca->idev->dev->ifindex;
3204
3205         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3206                 scope = RT_SCOPE_SITE;
3207
3208         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3209         if (nlh == NULL)
3210                 return -EMSGSIZE;
3211
3212         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3213         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3214             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3215                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3216                 nlmsg_cancel(skb, nlh);
3217                 return -EMSGSIZE;
3218         }
3219
3220         return nlmsg_end(skb, nlh);
3221 }
3222
3223 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3224                                 u32 pid, u32 seq, int event, unsigned int flags)
3225 {
3226         struct nlmsghdr  *nlh;
3227         u8 scope = RT_SCOPE_UNIVERSE;
3228         int ifindex = ifaca->aca_idev->dev->ifindex;
3229
3230         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3231                 scope = RT_SCOPE_SITE;
3232
3233         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3234         if (nlh == NULL)
3235                 return -EMSGSIZE;
3236
3237         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3238         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3239             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3240                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3241                 nlmsg_cancel(skb, nlh);
3242                 return -EMSGSIZE;
3243         }
3244
3245         return nlmsg_end(skb, nlh);
3246 }
3247
3248 enum addr_type_t
3249 {
3250         UNICAST_ADDR,
3251         MULTICAST_ADDR,
3252         ANYCAST_ADDR,
3253 };
3254
3255 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3256                            enum addr_type_t type)
3257 {
3258         int idx, ip_idx;
3259         int s_idx, s_ip_idx;
3260         int err = 1;
3261         struct net_device *dev;
3262         struct inet6_dev *idev = NULL;
3263         struct inet6_ifaddr *ifa;
3264         struct ifmcaddr6 *ifmca;
3265         struct ifacaddr6 *ifaca;
3266
3267         s_idx = cb->args[0];
3268         s_ip_idx = ip_idx = cb->args[1];
3269
3270         idx = 0;
3271         for_each_netdev(dev) {
3272                 if (idx < s_idx)
3273                         goto cont;
3274                 if (idx > s_idx)
3275                         s_ip_idx = 0;
3276                 ip_idx = 0;
3277                 if ((idev = in6_dev_get(dev)) == NULL)
3278                         goto cont;
3279                 read_lock_bh(&idev->lock);
3280                 switch (type) {
3281                 case UNICAST_ADDR:
3282                         /* unicast address incl. temp addr */
3283                         for (ifa = idev->addr_list; ifa;
3284                              ifa = ifa->if_next, ip_idx++) {
3285                                 if (ip_idx < s_ip_idx)
3286                                         continue;
3287                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3288                                     NETLINK_CB(cb->skb).pid,
3289                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3290                                     NLM_F_MULTI)) <= 0)
3291                                         goto done;
3292                         }
3293                         break;
3294                 case MULTICAST_ADDR:
3295                         /* multicast address */
3296                         for (ifmca = idev->mc_list; ifmca;
3297                              ifmca = ifmca->next, ip_idx++) {
3298                                 if (ip_idx < s_ip_idx)
3299                                         continue;
3300                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3301                                     NETLINK_CB(cb->skb).pid,
3302                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3303                                     NLM_F_MULTI)) <= 0)
3304                                         goto done;
3305                         }
3306                         break;
3307                 case ANYCAST_ADDR:
3308                         /* anycast address */
3309                         for (ifaca = idev->ac_list; ifaca;
3310                              ifaca = ifaca->aca_next, ip_idx++) {
3311                                 if (ip_idx < s_ip_idx)
3312                                         continue;
3313                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3314                                     NETLINK_CB(cb->skb).pid,
3315                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3316                                     NLM_F_MULTI)) <= 0)
3317                                         goto done;
3318                         }
3319                         break;
3320                 default:
3321                         break;
3322                 }
3323                 read_unlock_bh(&idev->lock);
3324                 in6_dev_put(idev);
3325 cont:
3326                 idx++;
3327         }
3328 done:
3329         if (err <= 0) {
3330                 read_unlock_bh(&idev->lock);
3331                 in6_dev_put(idev);
3332         }
3333         cb->args[0] = idx;
3334         cb->args[1] = ip_idx;
3335         return skb->len;
3336 }
3337
3338 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3339 {
3340         enum addr_type_t type = UNICAST_ADDR;
3341         return inet6_dump_addr(skb, cb, type);
3342 }
3343
3344 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3345 {
3346         enum addr_type_t type = MULTICAST_ADDR;
3347         return inet6_dump_addr(skb, cb, type);
3348 }
3349
3350
3351 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3352 {
3353         enum addr_type_t type = ANYCAST_ADDR;
3354         return inet6_dump_addr(skb, cb, type);
3355 }
3356
3357 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3358                              void *arg)
3359 {
3360         struct ifaddrmsg *ifm;
3361         struct nlattr *tb[IFA_MAX+1];
3362         struct in6_addr *addr = NULL;
3363         struct net_device *dev = NULL;
3364         struct inet6_ifaddr *ifa;
3365         struct sk_buff *skb;
3366         int err;
3367
3368         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3369         if (err < 0)
3370                 goto errout;
3371
3372         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3373         if (addr == NULL) {
3374                 err = -EINVAL;
3375                 goto errout;
3376         }
3377
3378         ifm = nlmsg_data(nlh);
3379         if (ifm->ifa_index)
3380                 dev = __dev_get_by_index(ifm->ifa_index);
3381
3382         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3383                 err = -EADDRNOTAVAIL;
3384                 goto errout;
3385         }
3386
3387         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3388                 err = -ENOBUFS;
3389                 goto errout_ifa;
3390         }
3391
3392         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3393                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3394         if (err < 0) {
3395                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3396                 WARN_ON(err == -EMSGSIZE);
3397                 kfree_skb(skb);
3398                 goto errout_ifa;
3399         }
3400         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3401 errout_ifa:
3402         in6_ifa_put(ifa);
3403 errout:
3404         return err;
3405 }
3406
3407 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3408 {
3409         struct sk_buff *skb;
3410         int err = -ENOBUFS;
3411
3412         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3413         if (skb == NULL)
3414                 goto errout;
3415
3416         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3417         if (err < 0) {
3418                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3419                 WARN_ON(err == -EMSGSIZE);
3420                 kfree_skb(skb);
3421                 goto errout;
3422         }
3423         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3424 errout:
3425         if (err < 0)
3426                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3427 }
3428
3429 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3430                                 __s32 *array, int bytes)
3431 {
3432         BUG_ON(bytes < (DEVCONF_MAX * 4));
3433
3434         memset(array, 0, bytes);
3435         array[DEVCONF_FORWARDING] = cnf->forwarding;
3436         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3437         array[DEVCONF_MTU6] = cnf->mtu6;
3438         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3439         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3440         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3441         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3442         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3443         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3444         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3445         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3446 #ifdef CONFIG_IPV6_PRIVACY
3447         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3448         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3449         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3450         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3451         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3452 #endif
3453         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3454         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3455         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3456 #ifdef CONFIG_IPV6_ROUTER_PREF
3457         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3458         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3459 #ifdef CONFIG_IPV6_ROUTE_INFO
3460         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3461 #endif
3462 #endif
3463         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3464         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3465 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3466         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3467 #endif
3468 }
3469
3470 static inline size_t inet6_if_nlmsg_size(void)
3471 {
3472         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3473                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3474                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3475                + nla_total_size(4) /* IFLA_MTU */
3476                + nla_total_size(4) /* IFLA_LINK */
3477                + nla_total_size( /* IFLA_PROTINFO */
3478                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3479                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3480                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3481                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3482                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3483                  );
3484 }
3485
3486 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3487                                       int bytes)
3488 {
3489         int i;
3490         int pad = bytes - sizeof(u64) * items;
3491         BUG_ON(pad < 0);
3492
3493         /* Use put_unaligned() because stats may not be aligned for u64. */
3494         put_unaligned(items, &stats[0]);
3495         for (i = 1; i < items; i++)
3496                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3497
3498         memset(&stats[items], 0, pad);
3499 }
3500
3501 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3502                              int bytes)
3503 {
3504         switch(attrtype) {
3505         case IFLA_INET6_STATS:
3506                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3507                 break;
3508         case IFLA_INET6_ICMP6STATS:
3509                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3510                 break;
3511         }
3512 }
3513
3514 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3515                              u32 pid, u32 seq, int event, unsigned int flags)
3516 {
3517         struct net_device *dev = idev->dev;
3518         struct nlattr *nla;
3519         struct ifinfomsg *hdr;
3520         struct nlmsghdr *nlh;
3521         void *protoinfo;
3522         struct ifla_cacheinfo ci;
3523
3524         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3525         if (nlh == NULL)
3526                 return -EMSGSIZE;
3527
3528         hdr = nlmsg_data(nlh);
3529         hdr->ifi_family = AF_INET6;
3530         hdr->__ifi_pad = 0;
3531         hdr->ifi_type = dev->type;
3532         hdr->ifi_index = dev->ifindex;
3533         hdr->ifi_flags = dev_get_flags(dev);
3534         hdr->ifi_change = 0;
3535
3536         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3537
3538         if (dev->addr_len)
3539                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3540
3541         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3542         if (dev->ifindex != dev->iflink)
3543                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3544
3545         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3546         if (protoinfo == NULL)
3547                 goto nla_put_failure;
3548
3549         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3550
3551         ci.max_reasm_len = IPV6_MAXPLEN;
3552         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3553                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3554         ci.reachable_time = idev->nd_parms->reachable_time;
3555         ci.retrans_time = idev->nd_parms->retrans_time;
3556         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3557
3558         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3559         if (nla == NULL)
3560                 goto nla_put_failure;
3561         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3562
3563         /* XXX - MC not implemented */
3564
3565         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3566         if (nla == NULL)
3567                 goto nla_put_failure;
3568         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3569
3570         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3571         if (nla == NULL)
3572                 goto nla_put_failure;
3573         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3574
3575         nla_nest_end(skb, protoinfo);
3576         return nlmsg_end(skb, nlh);
3577
3578 nla_put_failure:
3579         nlmsg_cancel(skb, nlh);
3580         return -EMSGSIZE;
3581 }
3582
3583 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3584 {
3585         int idx, err;
3586         int s_idx = cb->args[0];
3587         struct net_device *dev;
3588         struct inet6_dev *idev;
3589
3590         read_lock(&dev_base_lock);
3591         idx = 0;
3592         for_each_netdev(dev) {
3593                 if (idx < s_idx)
3594                         goto cont;
3595                 if ((idev = in6_dev_get(dev)) == NULL)
3596                         goto cont;
3597                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3598                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3599                 in6_dev_put(idev);
3600                 if (err <= 0)
3601                         break;
3602 cont:
3603                 idx++;
3604         }
3605         read_unlock(&dev_base_lock);
3606         cb->args[0] = idx;
3607
3608         return skb->len;
3609 }
3610
3611 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3612 {
3613         struct sk_buff *skb;
3614         int err = -ENOBUFS;
3615
3616         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3617         if (skb == NULL)
3618                 goto errout;
3619
3620         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3621         if (err < 0) {
3622                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3623                 WARN_ON(err == -EMSGSIZE);
3624                 kfree_skb(skb);
3625                 goto errout;
3626         }
3627         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3628 errout:
3629         if (err < 0)
3630                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3631 }
3632
3633 static inline size_t inet6_prefix_nlmsg_size(void)
3634 {
3635         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3636                + nla_total_size(sizeof(struct in6_addr))
3637                + nla_total_size(sizeof(struct prefix_cacheinfo));
3638 }
3639
3640 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3641                              struct prefix_info *pinfo, u32 pid, u32 seq,
3642                              int event, unsigned int flags)
3643 {
3644         struct prefixmsg *pmsg;
3645         struct nlmsghdr *nlh;
3646         struct prefix_cacheinfo ci;
3647
3648         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3649         if (nlh == NULL)
3650                 return -EMSGSIZE;
3651
3652         pmsg = nlmsg_data(nlh);
3653         pmsg->prefix_family = AF_INET6;
3654         pmsg->prefix_pad1 = 0;
3655         pmsg->prefix_pad2 = 0;
3656         pmsg->prefix_ifindex = idev->dev->ifindex;
3657         pmsg->prefix_len = pinfo->prefix_len;
3658         pmsg->prefix_type = pinfo->type;
3659         pmsg->prefix_pad3 = 0;
3660         pmsg->prefix_flags = 0;
3661         if (pinfo->onlink)
3662                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3663         if (pinfo->autoconf)
3664                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3665
3666         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3667
3668         ci.preferred_time = ntohl(pinfo->prefered);
3669         ci.valid_time = ntohl(pinfo->valid);
3670         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3671
3672         return nlmsg_end(skb, nlh);
3673
3674 nla_put_failure:
3675         nlmsg_cancel(skb, nlh);
3676         return -EMSGSIZE;
3677 }
3678
3679 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3680                          struct prefix_info *pinfo)
3681 {
3682         struct sk_buff *skb;
3683         int err = -ENOBUFS;
3684
3685         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3686         if (skb == NULL)
3687                 goto errout;
3688
3689         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3690         if (err < 0) {
3691                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3692                 WARN_ON(err == -EMSGSIZE);
3693                 kfree_skb(skb);
3694                 goto errout;
3695         }
3696         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3697 errout:
3698         if (err < 0)
3699                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3700 }
3701
3702 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3703 {
3704         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3705
3706         switch (event) {
3707         case RTM_NEWADDR:
3708                 /*
3709                  * If the address was optimistic
3710                  * we inserted the route at the start of
3711                  * our DAD process, so we don't need
3712                  * to do it again
3713                  */
3714                 if (!(ifp->rt->rt6i_node))
3715                         ip6_ins_rt(ifp->rt);
3716                 if (ifp->idev->cnf.forwarding)
3717                         addrconf_join_anycast(ifp);
3718                 break;
3719         case RTM_DELADDR:
3720                 if (ifp->idev->cnf.forwarding)
3721                         addrconf_leave_anycast(ifp);
3722                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3723                 dst_hold(&ifp->rt->u.dst);
3724                 if (ip6_del_rt(ifp->rt))
3725                         dst_free(&ifp->rt->u.dst);
3726                 break;
3727         }
3728 }
3729
3730 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3731 {
3732         rcu_read_lock_bh();
3733         if (likely(ifp->idev->dead == 0))
3734                 __ipv6_ifa_notify(event, ifp);
3735         rcu_read_unlock_bh();
3736 }
3737
3738 #ifdef CONFIG_SYSCTL
3739
3740 static
3741 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3742                            void __user *buffer, size_t *lenp, loff_t *ppos)
3743 {
3744         int *valp = ctl->data;
3745         int val = *valp;
3746         int ret;
3747
3748         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3749
3750         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3751                 if (valp != &ipv6_devconf.forwarding) {
3752                         if ((!*valp) ^ (!val)) {
3753                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3754                                 if (idev == NULL)
3755                                         return ret;
3756                                 dev_forward_change(idev);
3757                         }
3758                 } else {
3759                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3760                         addrconf_forward_change();
3761                 }
3762                 if (*valp)
3763                         rt6_purge_dflt_routers();
3764         }
3765
3766         return ret;
3767 }
3768
3769 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3770                                             int __user *name, int nlen,
3771                                             void __user *oldval,
3772                                             size_t __user *oldlenp,
3773                                             void __user *newval, size_t newlen)
3774 {
3775         int *valp = table->data;
3776         int new;
3777
3778         if (!newval || !newlen)
3779                 return 0;
3780         if (newlen != sizeof(int))
3781                 return -EINVAL;
3782         if (get_user(new, (int __user *)newval))
3783                 return -EFAULT;
3784         if (new == *valp)
3785                 return 0;
3786         if (oldval && oldlenp) {
3787                 size_t len;
3788                 if (get_user(len, oldlenp))
3789                         return -EFAULT;
3790                 if (len) {
3791                         if (len > table->maxlen)
3792                                 len = table->maxlen;
3793                         if (copy_to_user(oldval, valp, len))
3794                                 return -EFAULT;
3795                         if (put_user(len, oldlenp))
3796                                 return -EFAULT;
3797                 }
3798         }
3799
3800         if (valp != &ipv6_devconf_dflt.forwarding) {
3801                 if (valp != &ipv6_devconf.forwarding) {
3802                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3803                         int changed;
3804                         if (unlikely(idev == NULL))
3805                                 return -ENODEV;
3806                         changed = (!*valp) ^ (!new);
3807                         *valp = new;
3808                         if (changed)
3809                                 dev_forward_change(idev);
3810                 } else {
3811                         *valp = new;
3812                         addrconf_forward_change();
3813                 }
3814
3815                 if (*valp)
3816                         rt6_purge_dflt_routers();
3817         } else
3818                 *valp = new;
3819
3820         return 1;
3821 }
3822
3823 static struct addrconf_sysctl_table
3824 {
3825         struct ctl_table_header *sysctl_header;
3826         ctl_table addrconf_vars[__NET_IPV6_MAX];
3827         ctl_table addrconf_dev[2];
3828         ctl_table addrconf_conf_dir[2];
3829         ctl_table addrconf_proto_dir[2];
3830         ctl_table addrconf_root_dir[2];
3831 } addrconf_sysctl __read_mostly = {
3832         .sysctl_header = NULL,
3833         .addrconf_vars = {
3834                 {
3835                         .ctl_name       =       NET_IPV6_FORWARDING,
3836                         .procname       =       "forwarding",
3837                         .data           =       &ipv6_devconf.forwarding,
3838                         .maxlen         =       sizeof(int),
3839                         .mode           =       0644,
3840                         .proc_handler   =       &addrconf_sysctl_forward,
3841                         .strategy       =       &addrconf_sysctl_forward_strategy,
3842                 },
3843                 {
3844                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3845                         .procname       =       "hop_limit",
3846                         .data           =       &ipv6_devconf.hop_limit,
3847                         .maxlen         =       sizeof(int),
3848                         .mode           =       0644,
3849                         .proc_handler   =       proc_dointvec,
3850                 },
3851                 {
3852                         .ctl_name       =       NET_IPV6_MTU,
3853                         .procname       =       "mtu",
3854                         .data           =       &ipv6_devconf.mtu6,
3855                         .maxlen         =       sizeof(int),
3856                         .mode           =       0644,
3857                         .proc_handler   =       &proc_dointvec,
3858                 },
3859                 {
3860                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3861                         .procname       =       "accept_ra",
3862                         .data           =       &ipv6_devconf.accept_ra,
3863                         .maxlen         =       sizeof(int),
3864                         .mode           =       0644,
3865                         .proc_handler   =       &proc_dointvec,
3866                 },
3867                 {
3868                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3869                         .procname       =       "accept_redirects",
3870                         .data           =       &ipv6_devconf.accept_redirects,
3871                         .maxlen         =       sizeof(int),
3872                         .mode           =       0644,
3873                         .proc_handler   =       &proc_dointvec,
3874                 },
3875                 {
3876                         .ctl_name       =       NET_IPV6_AUTOCONF,
3877                         .procname       =       "autoconf",
3878                         .data           =       &ipv6_devconf.autoconf,
3879                         .maxlen         =       sizeof(int),
3880                         .mode           =       0644,
3881                         .proc_handler   =       &proc_dointvec,
3882                 },
3883                 {
3884                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3885                         .procname       =       "dad_transmits",
3886                         .data           =       &ipv6_devconf.dad_transmits,
3887                         .maxlen         =       sizeof(int),
3888                         .mode           =       0644,
3889                         .proc_handler   =       &proc_dointvec,
3890                 },
3891                 {
3892                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3893                         .procname       =       "router_solicitations",
3894                         .data           =       &ipv6_devconf.rtr_solicits,
3895                         .maxlen         =       sizeof(int),
3896                         .mode           =       0644,
3897                         .proc_handler   =       &proc_dointvec,
3898                 },
3899                 {
3900                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3901                         .procname       =       "router_solicitation_interval",
3902                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3903                         .maxlen         =       sizeof(int),
3904                         .mode           =       0644,
3905                         .proc_handler   =       &proc_dointvec_jiffies,
3906                         .strategy       =       &sysctl_jiffies,
3907                 },
3908                 {
3909                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3910                         .procname       =       "router_solicitation_delay",
3911                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3912                         .maxlen         =       sizeof(int),
3913                         .mode           =       0644,
3914                         .proc_handler   =       &proc_dointvec_jiffies,
3915                         .strategy       =       &sysctl_jiffies,
3916                 },
3917                 {
3918                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3919                         .procname       =       "force_mld_version",
3920                         .data           =       &ipv6_devconf.force_mld_version,
3921                         .maxlen         =       sizeof(int),
3922                         .mode           =       0644,
3923                         .proc_handler   =       &proc_dointvec,
3924                 },
3925 #ifdef CONFIG_IPV6_PRIVACY
3926                 {
3927                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3928                         .procname       =       "use_tempaddr",
3929                         .data           =       &ipv6_devconf.use_tempaddr,
3930                         .maxlen         =       sizeof(int),
3931                         .mode           =       0644,
3932                         .proc_handler   =       &proc_dointvec,
3933                 },
3934                 {
3935                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3936                         .procname       =       "temp_valid_lft",
3937                         .data           =       &ipv6_devconf.temp_valid_lft,
3938                         .maxlen         =       sizeof(int),
3939                         .mode           =       0644,
3940                         .proc_handler   =       &proc_dointvec,
3941                 },
3942                 {
3943                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3944                         .procname       =       "temp_prefered_lft",
3945                         .data           =       &ipv6_devconf.temp_prefered_lft,
3946                         .maxlen         =       sizeof(int),
3947                         .mode           =       0644,
3948                         .proc_handler   =       &proc_dointvec,
3949                 },
3950                 {
3951                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3952                         .procname       =       "regen_max_retry",
3953                         .data           =       &ipv6_devconf.regen_max_retry,
3954                         .maxlen         =       sizeof(int),
3955                         .mode           =       0644,
3956                         .proc_handler   =       &proc_dointvec,
3957                 },
3958                 {
3959                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3960                         .procname       =       "max_desync_factor",
3961                         .data           =       &ipv6_devconf.max_desync_factor,
3962                         .maxlen         =       sizeof(int),
3963                         .mode           =       0644,
3964                         .proc_handler   =       &proc_dointvec,
3965                 },
3966 #endif
3967                 {
3968                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3969                         .procname       =       "max_addresses",
3970                         .data           =       &ipv6_devconf.max_addresses,
3971                         .maxlen         =       sizeof(int),
3972                         .mode           =       0644,
3973                         .proc_handler   =       &proc_dointvec,
3974                 },
3975                 {
3976                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3977                         .procname       =       "accept_ra_defrtr",
3978                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3979                         .maxlen         =       sizeof(int),
3980                         .mode           =       0644,
3981                         .proc_handler   =       &proc_dointvec,
3982                 },
3983                 {
3984                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3985                         .procname       =       "accept_ra_pinfo",
3986                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3987                         .maxlen         =       sizeof(int),
3988                         .mode           =       0644,
3989                         .proc_handler   =       &proc_dointvec,
3990                 },
3991 #ifdef CONFIG_IPV6_ROUTER_PREF
3992                 {
3993                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3994                         .procname       =       "accept_ra_rtr_pref",
3995                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3996                         .maxlen         =       sizeof(int),
3997                         .mode           =       0644,
3998                         .proc_handler   =       &proc_dointvec,
3999                 },
4000                 {
4001                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4002                         .procname       =       "router_probe_interval",
4003                         .data           =       &ipv6_devconf.rtr_probe_interval,
4004                         .maxlen         =       sizeof(int),
4005                         .mode           =       0644,
4006                         .proc_handler   =       &proc_dointvec_jiffies,
4007                         .strategy       =       &sysctl_jiffies,
4008                 },
4009 #ifdef CONFIG_IPV6_ROUTE_INFO
4010                 {
4011                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4012                         .procname       =       "accept_ra_rt_info_max_plen",
4013                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4014                         .maxlen         =       sizeof(int),
4015                         .mode           =       0644,
4016                         .proc_handler   =       &proc_dointvec,
4017                 },
4018 #endif
4019 #endif
4020                 {
4021                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4022                         .procname       =       "proxy_ndp",
4023                         .data           =       &ipv6_devconf.proxy_ndp,
4024                         .maxlen         =       sizeof(int),
4025                         .mode           =       0644,
4026                         .proc_handler   =       &proc_dointvec,
4027                 },
4028                 {
4029                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4030                         .procname       =       "accept_source_route",
4031                         .data           =       &ipv6_devconf.accept_source_route,
4032                         .maxlen         =       sizeof(int),
4033                         .mode           =       0644,
4034                         .proc_handler   =       &proc_dointvec,
4035                 },
4036 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4037                 {
4038                         .ctl_name       =       CTL_UNNUMBERED,
4039                         .procname       =       "optimistic_dad",
4040                         .data           =       &ipv6_devconf.optimistic_dad,
4041                         .maxlen         =       sizeof(int),
4042                         .mode           =       0644,
4043                         .proc_handler   =       &proc_dointvec,
4044
4045                 },
4046 #endif
4047                 {
4048                         .ctl_name       =       0,      /* sentinel */
4049                 }
4050         },
4051         .addrconf_dev = {
4052                 {
4053                         .ctl_name       =       NET_PROTO_CONF_ALL,
4054                         .procname       =       "all",
4055                         .mode           =       0555,
4056                         .child          =       addrconf_sysctl.addrconf_vars,
4057                 },
4058                 {
4059                         .ctl_name       =       0,      /* sentinel */
4060                 }
4061         },
4062         .addrconf_conf_dir = {
4063                 {
4064                         .ctl_name       =       NET_IPV6_CONF,
4065                         .procname       =       "conf",
4066                         .mode           =       0555,
4067                         .child          =       addrconf_sysctl.addrconf_dev,
4068                 },
4069                 {
4070                         .ctl_name       =       0,      /* sentinel */
4071                 }
4072         },
4073         .addrconf_proto_dir = {
4074                 {
4075                         .ctl_name       =       NET_IPV6,
4076                         .procname       =       "ipv6",
4077                         .mode           =       0555,
4078                         .child          =       addrconf_sysctl.addrconf_conf_dir,
4079                 },
4080                 {
4081                         .ctl_name       =       0,      /* sentinel */
4082                 }
4083         },
4084         .addrconf_root_dir = {
4085                 {
4086                         .ctl_name       =       CTL_NET,
4087                         .procname       =       "net",
4088                         .mode           =       0555,
4089                         .child          =       addrconf_sysctl.addrconf_proto_dir,
4090                 },
4091                 {
4092                         .ctl_name       =       0,      /* sentinel */
4093                 }
4094         },
4095 };
4096
4097 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4098 {
4099         int i;
4100         struct net_device *dev = idev ? idev->dev : NULL;
4101         struct addrconf_sysctl_table *t;
4102         char *dev_name = NULL;
4103
4104         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4105         if (t == NULL)
4106                 return;
4107         for (i=0; t->addrconf_vars[i].data; i++) {
4108                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4109                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4110         }
4111         if (dev) {
4112                 dev_name = dev->name;
4113                 t->addrconf_dev[0].ctl_name = dev->ifindex;
4114         } else {
4115                 dev_name = "default";
4116                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4117         }
4118
4119         /*
4120          * Make a copy of dev_name, because '.procname' is regarded as const
4121          * by sysctl and we wouldn't want anyone to change it under our feet
4122          * (see SIOCSIFNAME).
4123          */
4124         dev_name = kstrdup(dev_name, GFP_KERNEL);
4125         if (!dev_name)
4126             goto free;
4127
4128         t->addrconf_dev[0].procname = dev_name;
4129
4130         t->addrconf_dev[0].child = t->addrconf_vars;
4131         t->addrconf_conf_dir[0].child = t->addrconf_dev;
4132         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4133         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4134
4135         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4136         if (t->sysctl_header == NULL)
4137                 goto free_procname;
4138         else
4139                 p->sysctl = t;
4140         return;
4141
4142         /* error path */
4143  free_procname:
4144         kfree(dev_name);
4145  free:
4146         kfree(t);
4147
4148         return;
4149 }
4150
4151 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4152 {
4153         if (p->sysctl) {
4154                 struct addrconf_sysctl_table *t = p->sysctl;
4155                 p->sysctl = NULL;
4156                 unregister_sysctl_table(t->sysctl_header);
4157                 kfree(t->addrconf_dev[0].procname);
4158                 kfree(t);
4159         }
4160 }
4161
4162
4163 #endif
4164
4165 /*
4166  *      Device notifier
4167  */
4168
4169 int register_inet6addr_notifier(struct notifier_block *nb)
4170 {
4171         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4172 }
4173
4174 EXPORT_SYMBOL(register_inet6addr_notifier);
4175
4176 int unregister_inet6addr_notifier(struct notifier_block *nb)
4177 {
4178         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4179 }
4180
4181 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4182
4183 /*
4184  *      Init / cleanup code
4185  */
4186
4187 int __init addrconf_init(void)
4188 {
4189         int err = 0;
4190
4191         /* The addrconf netdev notifier requires that loopback_dev
4192          * has it's ipv6 private information allocated and setup
4193          * before it can bring up and give link-local addresses
4194          * to other devices which are up.
4195          *
4196          * Unfortunately, loopback_dev is not necessarily the first
4197          * entry in the global dev_base list of net devices.  In fact,
4198          * it is likely to be the very last entry on that list.
4199          * So this causes the notifier registry below to try and
4200          * give link-local addresses to all devices besides loopback_dev
4201          * first, then loopback_dev, which cases all the non-loopback_dev
4202          * devices to fail to get a link-local address.
4203          *
4204          * So, as a temporary fix, allocate the ipv6 structure for
4205          * loopback_dev first by hand.
4206          * Longer term, all of the dependencies ipv6 has upon the loopback
4207          * device and it being up should be removed.
4208          */
4209         rtnl_lock();
4210         if (!ipv6_add_dev(&loopback_dev))
4211                 err = -ENOMEM;
4212         rtnl_unlock();
4213         if (err)
4214                 return err;
4215
4216         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4217 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4218         ip6_prohibit_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4219         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4220 #endif
4221
4222         register_netdevice_notifier(&ipv6_dev_notf);
4223
4224         addrconf_verify(0);
4225
4226         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4227         if (err < 0)
4228                 goto errout;
4229
4230         /* Only the first call to __rtnl_register can fail */
4231         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4232         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4233         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4234         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4235         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4236
4237 #ifdef CONFIG_SYSCTL
4238         addrconf_sysctl.sysctl_header =
4239                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4240         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4241 #endif
4242
4243         return 0;
4244 errout:
4245         unregister_netdevice_notifier(&ipv6_dev_notf);
4246
4247         return err;
4248 }
4249
4250 void __exit addrconf_cleanup(void)
4251 {
4252         struct net_device *dev;
4253         struct inet6_ifaddr *ifa;
4254         int i;
4255
4256         unregister_netdevice_notifier(&ipv6_dev_notf);
4257
4258 #ifdef CONFIG_SYSCTL
4259         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4260         addrconf_sysctl_unregister(&ipv6_devconf);
4261 #endif
4262
4263         rtnl_lock();
4264
4265         /*
4266          *      clean dev list.
4267          */
4268
4269         for_each_netdev(dev) {
4270                 if (__in6_dev_get(dev) == NULL)
4271                         continue;
4272                 addrconf_ifdown(dev, 1);
4273         }
4274         addrconf_ifdown(&loopback_dev, 2);
4275
4276         /*
4277          *      Check hash table.
4278          */
4279
4280         write_lock_bh(&addrconf_hash_lock);
4281         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4282                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4283                         struct inet6_ifaddr *bifa;
4284
4285                         bifa = ifa;
4286                         ifa = ifa->lst_next;
4287                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4288                         /* Do not free it; something is wrong.
4289                            Now we can investigate it with debugger.
4290                          */
4291                 }
4292         }
4293         write_unlock_bh(&addrconf_hash_lock);
4294
4295         del_timer(&addr_chk_timer);
4296
4297         rtnl_unlock();
4298
4299 #ifdef CONFIG_PROC_FS
4300         proc_net_remove(&init_net, "if_inet6");
4301 #endif
4302 }