err.no Git - linux-2.6/blob - net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      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 <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <asm/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90
  91 /* Set to 3 to get tracing... */
  92 #define ACONF_DEBUG 2
  93
  94 #if ACONF_DEBUG >= 3
  95 #define ADBG(x) printk x
  96 #else
  97 #define ADBG(x)
  98 #endif
  99
 100 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 102
 103 #ifdef CONFIG_SYSCTL
 104 static void addrconf_sysctl_register(struct inet6_dev *idev);
 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 106 #else
 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 108 {
 109 }
 110
 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 112 {
 113 }
 114 #endif
 115
 116 #ifdef CONFIG_IPV6_PRIVACY
 117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 119 static void ipv6_regen_rndid(unsigned long data);
 120
 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 122 #endif
 123
 124 static int ipv6_count_addresses(struct inet6_dev *idev);
 125
 126 /*
 127  *      Configured unicast address hash table
 128  */
 129 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 130 static DEFINE_RWLOCK(addrconf_hash_lock);
 131
 132 static void addrconf_verify(unsigned long);
 133
 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 135 static DEFINE_SPINLOCK(addrconf_verify_lock);
 136
 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 139
 140 static int addrconf_ifdown(struct net_device *dev, int how);
 141
 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 143 static void addrconf_dad_timer(unsigned long data);
 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 145 static void addrconf_dad_run(struct inet6_dev *idev);
 146 static void addrconf_rs_timer(unsigned long data);
 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 149
 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 151                                 struct prefix_info *pinfo);
 152 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 153
 154 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 155
 156 struct ipv6_devconf ipv6_devconf __read_mostly = {
 157         .forwarding             = 0,
 158         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 159         .mtu6                   = IPV6_MIN_MTU,
 160         .accept_ra              = 1,
 161         .accept_redirects       = 1,
 162         .autoconf               = 1,
 163         .force_mld_version      = 0,
 164         .dad_transmits          = 1,
 165         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 166         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 167         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 168 #ifdef CONFIG_IPV6_PRIVACY
 169         .use_tempaddr           = 0,
 170         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 171         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 172         .regen_max_retry        = REGEN_MAX_RETRY,
 173         .max_desync_factor      = MAX_DESYNC_FACTOR,
 174 #endif
 175         .max_addresses          = IPV6_MAX_ADDRESSES,
 176         .accept_ra_defrtr       = 1,
 177         .accept_ra_pinfo        = 1,
 178 #ifdef CONFIG_IPV6_ROUTER_PREF
 179         .accept_ra_rtr_pref     = 1,
 180         .rtr_probe_interval     = 60 * HZ,
 181 #ifdef CONFIG_IPV6_ROUTE_INFO
 182         .accept_ra_rt_info_max_plen = 0,
 183 #endif
 184 #endif
 185         .proxy_ndp              = 0,
 186         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 187 };
 188
 189 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 190         .forwarding             = 0,
 191         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 192         .mtu6                   = IPV6_MIN_MTU,
 193         .accept_ra              = 1,
 194         .accept_redirects       = 1,
 195         .autoconf               = 1,
 196         .dad_transmits          = 1,
 197         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 198         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 199         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 200 #ifdef CONFIG_IPV6_PRIVACY
 201         .use_tempaddr           = 0,
 202         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 203         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 204         .regen_max_retry        = REGEN_MAX_RETRY,
 205         .max_desync_factor      = MAX_DESYNC_FACTOR,
 206 #endif
 207         .max_addresses          = IPV6_MAX_ADDRESSES,
 208         .accept_ra_defrtr       = 1,
 209         .accept_ra_pinfo        = 1,
 210 #ifdef CONFIG_IPV6_ROUTER_PREF
 211         .accept_ra_rtr_pref     = 1,
 212         .rtr_probe_interval     = 60 * HZ,
 213 #ifdef CONFIG_IPV6_ROUTE_INFO
 214         .accept_ra_rt_info_max_plen = 0,
 215 #endif
 216 #endif
 217         .proxy_ndp              = 0,
 218         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 219 };
 220
 221 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 222 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 223 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 224
 225 /* Check if a valid qdisc is available */
 226 static inline int addrconf_qdisc_ok(struct net_device *dev)
 227 {
 228         return (dev->qdisc != &noop_qdisc);
 229 }
 230
 231 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 232 {
 233         if (del_timer(&ifp->timer))
 234                 __in6_ifa_put(ifp);
 235 }
 236
 237 enum addrconf_timer_t
 238 {
 239         AC_NONE,
 240         AC_DAD,
 241         AC_RS,
 242 };
 243
 244 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 245                                enum addrconf_timer_t what,
 246                                unsigned long when)
 247 {
 248         if (!del_timer(&ifp->timer))
 249                 in6_ifa_hold(ifp);
 250
 251         switch (what) {
 252         case AC_DAD:
 253                 ifp->timer.function = addrconf_dad_timer;
 254                 break;
 255         case AC_RS:
 256                 ifp->timer.function = addrconf_rs_timer;
 257                 break;
 258         default:;
 259         }
 260         ifp->timer.expires = jiffies + when;
 261         add_timer(&ifp->timer);
 262 }
 263
 264 static int snmp6_alloc_dev(struct inet6_dev *idev)
 265 {
 266         if (snmp_mib_init((void **)idev->stats.ipv6,
 267                           sizeof(struct ipstats_mib)) < 0)
 268                 goto err_ip;
 269         if (snmp_mib_init((void **)idev->stats.icmpv6,
 270                           sizeof(struct icmpv6_mib)) < 0)
 271                 goto err_icmp;
 272         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 273                           sizeof(struct icmpv6msg_mib)) < 0)
 274                 goto err_icmpmsg;
 275
 276         return 0;
 277
 278 err_icmpmsg:
 279         snmp_mib_free((void **)idev->stats.icmpv6);
 280 err_icmp:
 281         snmp_mib_free((void **)idev->stats.ipv6);
 282 err_ip:
 283         return -ENOMEM;
 284 }
 285
 286 static void snmp6_free_dev(struct inet6_dev *idev)
 287 {
 288         snmp_mib_free((void **)idev->stats.icmpv6msg);
 289         snmp_mib_free((void **)idev->stats.icmpv6);
 290         snmp_mib_free((void **)idev->stats.ipv6);
 291 }
 292
 293 /* Nobody refers to this device, we may destroy it. */
 294
 295 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 296 {
 297         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 298         kfree(idev);
 299 }
 300
 301 void in6_dev_finish_destroy(struct inet6_dev *idev)
 302 {
 303         struct net_device *dev = idev->dev;
 304         BUG_TRAP(idev->addr_list==NULL);
 305         BUG_TRAP(idev->mc_list==NULL);
 306 #ifdef NET_REFCNT_DEBUG
 307         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 308 #endif
 309         dev_put(dev);
 310         if (!idev->dead) {
 311                 printk("Freeing alive inet6 device %p\n", idev);
 312                 return;
 313         }
 314         snmp6_free_dev(idev);
 315         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 316 }
 317
 318 EXPORT_SYMBOL(in6_dev_finish_destroy);
 319
 320 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 321 {
 322         struct inet6_dev *ndev;
 323         struct in6_addr maddr;
 324
 325         ASSERT_RTNL();
 326
 327         if (dev->mtu < IPV6_MIN_MTU)
 328                 return NULL;
 329
 330         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 331
 332         if (ndev == NULL)
 333                 return NULL;
 334
 335         rwlock_init(&ndev->lock);
 336         ndev->dev = dev;
 337         memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
 338         ndev->cnf.mtu6 = dev->mtu;
 339         ndev->cnf.sysctl = NULL;
 340         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 341         if (ndev->nd_parms == NULL) {
 342                 kfree(ndev);
 343                 return NULL;
 344         }
 345         /* We refer to the device */
 346         dev_hold(dev);
 347
 348         if (snmp6_alloc_dev(ndev) < 0) {
 349                 ADBG((KERN_WARNING
 350                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 351                         __FUNCTION__, dev->name));
 352                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 353                 ndev->dead = 1;
 354                 in6_dev_finish_destroy(ndev);
 355                 return NULL;
 356         }
 357
 358         if (snmp6_register_dev(ndev) < 0) {
 359                 ADBG((KERN_WARNING
 360                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 361                         __FUNCTION__, dev->name));
 362                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 363                 ndev->dead = 1;
 364                 in6_dev_finish_destroy(ndev);
 365                 return NULL;
 366         }
 367
 368         /* One reference from device.  We must do this before
 369          * we invoke __ipv6_regen_rndid().
 370          */
 371         in6_dev_hold(ndev);
 372
 373 #ifdef CONFIG_IPV6_PRIVACY
 374         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 375         if ((dev->flags&IFF_LOOPBACK) ||
 376             dev->type == ARPHRD_TUNNEL ||
 377 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 378             dev->type == ARPHRD_SIT ||
 379 #endif
 380             dev->type == ARPHRD_NONE) {
 381                 printk(KERN_INFO
 382                        "%s: Disabled Privacy Extensions\n",
 383                        dev->name);
 384                 ndev->cnf.use_tempaddr = -1;
 385
 386                 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 387                         printk(KERN_INFO
 388                                "%s: Disabled Multicast RS\n",
 389                                dev->name);
 390                         ndev->cnf.rtr_solicits = 0;
 391                 }
 392         } else {
 393                 in6_dev_hold(ndev);
 394                 ipv6_regen_rndid((unsigned long) ndev);
 395         }
 396 #endif
 397
 398         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 399                 ndev->if_flags |= IF_READY;
 400
 401         ipv6_mc_init_dev(ndev);
 402         ndev->tstamp = jiffies;
 403         addrconf_sysctl_register(ndev);
 404         /* protected by rtnl_lock */
 405         rcu_assign_pointer(dev->ip6_ptr, ndev);
 406
 407         /* Join all-node multicast group */
 408         ipv6_addr_all_nodes(&maddr);
 409         ipv6_dev_mc_inc(dev, &maddr);
 410
 411         return ndev;
 412 }
 413
 414 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 415 {
 416         struct inet6_dev *idev;
 417
 418         ASSERT_RTNL();
 419
 420         if ((idev = __in6_dev_get(dev)) == NULL) {
 421                 if ((idev = ipv6_add_dev(dev)) == NULL)
 422                         return NULL;
 423         }
 424
 425         if (dev->flags&IFF_UP)
 426                 ipv6_mc_up(idev);
 427         return idev;
 428 }
 429
 430 #ifdef CONFIG_SYSCTL
 431 static void dev_forward_change(struct inet6_dev *idev)
 432 {
 433         struct net_device *dev;
 434         struct inet6_ifaddr *ifa;
 435         struct in6_addr addr;
 436
 437         if (!idev)
 438                 return;
 439         dev = idev->dev;
 440         if (dev && (dev->flags & IFF_MULTICAST)) {
 441                 ipv6_addr_all_routers(&addr);
 442
 443                 if (idev->cnf.forwarding)
 444                         ipv6_dev_mc_inc(dev, &addr);
 445                 else
 446                         ipv6_dev_mc_dec(dev, &addr);
 447         }
 448         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 449                 if (ifa->flags&IFA_F_TENTATIVE)
 450                         continue;
 451                 if (idev->cnf.forwarding)
 452                         addrconf_join_anycast(ifa);
 453                 else
 454                         addrconf_leave_anycast(ifa);
 455         }
 456 }
 457
 458
 459 static void addrconf_forward_change(struct net *net, __s32 newf)
 460 {
 461         struct net_device *dev;
 462         struct inet6_dev *idev;
 463
 464         read_lock(&dev_base_lock);
 465         for_each_netdev(net, dev) {
 466                 rcu_read_lock();
 467                 idev = __in6_dev_get(dev);
 468                 if (idev) {
 469                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 470                         idev->cnf.forwarding = newf;
 471                         if (changed)
 472                                 dev_forward_change(idev);
 473                 }
 474                 rcu_read_unlock();
 475         }
 476         read_unlock(&dev_base_lock);
 477 }
 478
 479 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 480 {
 481         struct net *net;
 482
 483         net = (struct net *)table->extra2;
 484         if (p == &net->ipv6.devconf_dflt->forwarding)
 485                 return;
 486
 487         if (p == &net->ipv6.devconf_all->forwarding) {
 488                 __s32 newf = net->ipv6.devconf_all->forwarding;
 489                 net->ipv6.devconf_dflt->forwarding = newf;
 490                 addrconf_forward_change(net, newf);
 491         } else if ((!*p) ^ (!old))
 492                 dev_forward_change((struct inet6_dev *)table->extra1);
 493
 494         if (*p)
 495                 rt6_purge_dflt_routers();
 496 }
 497 #endif
 498
 499 /* Nobody refers to this ifaddr, destroy it */
 500
 501 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 502 {
 503         BUG_TRAP(ifp->if_next==NULL);
 504         BUG_TRAP(ifp->lst_next==NULL);
 505 #ifdef NET_REFCNT_DEBUG
 506         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 507 #endif
 508
 509         in6_dev_put(ifp->idev);
 510
 511         if (del_timer(&ifp->timer))
 512                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 513
 514         if (!ifp->dead) {
 515                 printk("Freeing alive inet6 address %p\n", ifp);
 516                 return;
 517         }
 518         dst_release(&ifp->rt->u.dst);
 519
 520         kfree(ifp);
 521 }
 522
 523 static void
 524 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 525 {
 526         struct inet6_ifaddr *ifa, **ifap;
 527         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 528
 529         /*
 530          * Each device address list is sorted in order of scope -
 531          * global before linklocal.
 532          */
 533         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 534              ifap = &ifa->if_next) {
 535                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 536                         break;
 537         }
 538
 539         ifp->if_next = *ifap;
 540         *ifap = ifp;
 541 }
 542
 543 /* On success it returns ifp with increased reference count */
 544
 545 static struct inet6_ifaddr *
 546 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 547               int scope, u32 flags)
 548 {
 549         struct inet6_ifaddr *ifa = NULL;
 550         struct rt6_info *rt;
 551         int hash;
 552         int err = 0;
 553
 554         rcu_read_lock_bh();
 555         if (idev->dead) {
 556                 err = -ENODEV;                  /*XXX*/
 557                 goto out2;
 558         }
 559
 560         write_lock(&addrconf_hash_lock);
 561
 562         /* Ignore adding duplicate addresses on an interface */
 563         if (ipv6_chk_same_addr(addr, idev->dev)) {
 564                 ADBG(("ipv6_add_addr: already assigned\n"));
 565                 err = -EEXIST;
 566                 goto out;
 567         }
 568
 569         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 570
 571         if (ifa == NULL) {
 572                 ADBG(("ipv6_add_addr: malloc failed\n"));
 573                 err = -ENOBUFS;
 574                 goto out;
 575         }
 576
 577         rt = addrconf_dst_alloc(idev, addr, 0);
 578         if (IS_ERR(rt)) {
 579                 err = PTR_ERR(rt);
 580                 goto out;
 581         }
 582
 583         ipv6_addr_copy(&ifa->addr, addr);
 584
 585         spin_lock_init(&ifa->lock);
 586         init_timer(&ifa->timer);
 587         ifa->timer.data = (unsigned long) ifa;
 588         ifa->scope = scope;
 589         ifa->prefix_len = pfxlen;
 590         ifa->flags = flags | IFA_F_TENTATIVE;
 591         ifa->cstamp = ifa->tstamp = jiffies;
 592
 593         ifa->rt = rt;
 594
 595         /*
 596          * part one of RFC 4429, section 3.3
 597          * We should not configure an address as
 598          * optimistic if we do not yet know the link
 599          * layer address of our nexhop router
 600          */
 601
 602         if (rt->rt6i_nexthop == NULL)
 603                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 604
 605         ifa->idev = idev;
 606         in6_dev_hold(idev);
 607         /* For caller */
 608         in6_ifa_hold(ifa);
 609
 610         /* Add to big hash table */
 611         hash = ipv6_addr_hash(addr);
 612
 613         ifa->lst_next = inet6_addr_lst[hash];
 614         inet6_addr_lst[hash] = ifa;
 615         in6_ifa_hold(ifa);
 616         write_unlock(&addrconf_hash_lock);
 617
 618         write_lock(&idev->lock);
 619         /* Add to inet6_dev unicast addr list. */
 620         ipv6_link_dev_addr(idev, ifa);
 621
 622 #ifdef CONFIG_IPV6_PRIVACY
 623         if (ifa->flags&IFA_F_TEMPORARY) {
 624                 ifa->tmp_next = idev->tempaddr_list;
 625                 idev->tempaddr_list = ifa;
 626                 in6_ifa_hold(ifa);
 627         }
 628 #endif
 629
 630         in6_ifa_hold(ifa);
 631         write_unlock(&idev->lock);
 632 out2:
 633         rcu_read_unlock_bh();
 634
 635         if (likely(err == 0))
 636                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 637         else {
 638                 kfree(ifa);
 639                 ifa = ERR_PTR(err);
 640         }
 641
 642         return ifa;
 643 out:
 644         write_unlock(&addrconf_hash_lock);
 645         goto out2;
 646 }
 647
 648 /* This function wants to get referenced ifp and releases it before return */
 649
 650 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 651 {
 652         struct inet6_ifaddr *ifa, **ifap;
 653         struct inet6_dev *idev = ifp->idev;
 654         int hash;
 655         int deleted = 0, onlink = 0;
 656         unsigned long expires = jiffies;
 657
 658         hash = ipv6_addr_hash(&ifp->addr);
 659
 660         ifp->dead = 1;
 661
 662         write_lock_bh(&addrconf_hash_lock);
 663         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 664              ifap = &ifa->lst_next) {
 665                 if (ifa == ifp) {
 666                         *ifap = ifa->lst_next;
 667                         __in6_ifa_put(ifp);
 668                         ifa->lst_next = NULL;
 669                         break;
 670                 }
 671         }
 672         write_unlock_bh(&addrconf_hash_lock);
 673
 674         write_lock_bh(&idev->lock);
 675 #ifdef CONFIG_IPV6_PRIVACY
 676         if (ifp->flags&IFA_F_TEMPORARY) {
 677                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 678                      ifap = &ifa->tmp_next) {
 679                         if (ifa == ifp) {
 680                                 *ifap = ifa->tmp_next;
 681                                 if (ifp->ifpub) {
 682                                         in6_ifa_put(ifp->ifpub);
 683                                         ifp->ifpub = NULL;
 684                                 }
 685                                 __in6_ifa_put(ifp);
 686                                 ifa->tmp_next = NULL;
 687                                 break;
 688                         }
 689                 }
 690         }
 691 #endif
 692
 693         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 694                 if (ifa == ifp) {
 695                         *ifap = ifa->if_next;
 696                         __in6_ifa_put(ifp);
 697                         ifa->if_next = NULL;
 698                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 699                                 break;
 700                         deleted = 1;
 701                         continue;
 702                 } else if (ifp->flags & IFA_F_PERMANENT) {
 703                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 704                                               ifp->prefix_len)) {
 705                                 if (ifa->flags & IFA_F_PERMANENT) {
 706                                         onlink = 1;
 707                                         if (deleted)
 708                                                 break;
 709                                 } else {
 710                                         unsigned long lifetime;
 711
 712                                         if (!onlink)
 713                                                 onlink = -1;
 714
 715                                         spin_lock(&ifa->lock);
 716                                         lifetime = min_t(unsigned long,
 717                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 718                                         if (time_before(expires,
 719                                                         ifa->tstamp + lifetime * HZ))
 720                                                 expires = ifa->tstamp + lifetime * HZ;
 721                                         spin_unlock(&ifa->lock);
 722                                 }
 723                         }
 724                 }
 725                 ifap = &ifa->if_next;
 726         }
 727         write_unlock_bh(&idev->lock);
 728
 729         ipv6_ifa_notify(RTM_DELADDR, ifp);
 730
 731         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 732
 733         addrconf_del_timer(ifp);
 734
 735         /*
 736          * Purge or update corresponding prefix
 737          *
 738          * 1) we don't purge prefix here if address was not permanent.
 739          *    prefix is managed by its own lifetime.
 740          * 2) if there're no addresses, delete prefix.
 741          * 3) if there're still other permanent address(es),
 742          *    corresponding prefix is still permanent.
 743          * 4) otherwise, update prefix lifetime to the
 744          *    longest valid lifetime among the corresponding
 745          *    addresses on the device.
 746          *    Note: subsequent RA will update lifetime.
 747          *
 748          * --yoshfuji
 749          */
 750         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 751                 struct in6_addr prefix;
 752                 struct rt6_info *rt;
 753
 754                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 755                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 756
 757                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 758                         if (onlink == 0) {
 759                                 ip6_del_rt(rt);
 760                                 rt = NULL;
 761                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 762                                 rt->rt6i_expires = expires;
 763                                 rt->rt6i_flags |= RTF_EXPIRES;
 764                         }
 765                 }
 766                 dst_release(&rt->u.dst);
 767         }
 768
 769         in6_ifa_put(ifp);
 770 }
 771
 772 #ifdef CONFIG_IPV6_PRIVACY
 773 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 774 {
 775         struct inet6_dev *idev = ifp->idev;
 776         struct in6_addr addr, *tmpaddr;
 777         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 778         int tmp_plen;
 779         int ret = 0;
 780         int max_addresses;
 781         u32 addr_flags;
 782
 783         write_lock(&idev->lock);
 784         if (ift) {
 785                 spin_lock_bh(&ift->lock);
 786                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 787                 spin_unlock_bh(&ift->lock);
 788                 tmpaddr = &addr;
 789         } else {
 790                 tmpaddr = NULL;
 791         }
 792 retry:
 793         in6_dev_hold(idev);
 794         if (idev->cnf.use_tempaddr <= 0) {
 795                 write_unlock(&idev->lock);
 796                 printk(KERN_INFO
 797                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 798                 in6_dev_put(idev);
 799                 ret = -1;
 800                 goto out;
 801         }
 802         spin_lock_bh(&ifp->lock);
 803         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 804                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 805                 spin_unlock_bh(&ifp->lock);
 806                 write_unlock(&idev->lock);
 807                 printk(KERN_WARNING
 808                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 809                 in6_dev_put(idev);
 810                 ret = -1;
 811                 goto out;
 812         }
 813         in6_ifa_hold(ifp);
 814         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 815         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 816                 spin_unlock_bh(&ifp->lock);
 817                 write_unlock(&idev->lock);
 818                 printk(KERN_WARNING
 819                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 820                 in6_ifa_put(ifp);
 821                 in6_dev_put(idev);
 822                 ret = -1;
 823                 goto out;
 824         }
 825         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 826         tmp_valid_lft = min_t(__u32,
 827                               ifp->valid_lft,
 828                               idev->cnf.temp_valid_lft);
 829         tmp_prefered_lft = min_t(__u32,
 830                                  ifp->prefered_lft,
 831                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 832         tmp_plen = ifp->prefix_len;
 833         max_addresses = idev->cnf.max_addresses;
 834         tmp_cstamp = ifp->cstamp;
 835         tmp_tstamp = ifp->tstamp;
 836         spin_unlock_bh(&ifp->lock);
 837
 838         write_unlock(&idev->lock);
 839
 840         addr_flags = IFA_F_TEMPORARY;
 841         /* set in addrconf_prefix_rcv() */
 842         if (ifp->flags & IFA_F_OPTIMISTIC)
 843                 addr_flags |= IFA_F_OPTIMISTIC;
 844
 845         ift = !max_addresses ||
 846               ipv6_count_addresses(idev) < max_addresses ?
 847                 ipv6_add_addr(idev, &addr, tmp_plen,
 848                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 849                               addr_flags) : NULL;
 850         if (!ift || IS_ERR(ift)) {
 851                 in6_ifa_put(ifp);
 852                 in6_dev_put(idev);
 853                 printk(KERN_INFO
 854                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 855                 tmpaddr = &addr;
 856                 write_lock(&idev->lock);
 857                 goto retry;
 858         }
 859
 860         spin_lock_bh(&ift->lock);
 861         ift->ifpub = ifp;
 862         ift->valid_lft = tmp_valid_lft;
 863         ift->prefered_lft = tmp_prefered_lft;
 864         ift->cstamp = tmp_cstamp;
 865         ift->tstamp = tmp_tstamp;
 866         spin_unlock_bh(&ift->lock);
 867
 868         addrconf_dad_start(ift, 0);
 869         in6_ifa_put(ift);
 870         in6_dev_put(idev);
 871 out:
 872         return ret;
 873 }
 874 #endif
 875
 876 /*
 877  *      Choose an appropriate source address (RFC3484)
 878  */
 879 struct ipv6_saddr_score {
 880         int             addr_type;
 881         unsigned int    attrs;
 882         int             matchlen;
 883         int             scope;
 884         unsigned int    rule;
 885 };
 886
 887 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 888 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 889 #define IPV6_SADDR_SCORE_HOA            0x0008
 890 #define IPV6_SADDR_SCORE_OIF            0x0010
 891 #define IPV6_SADDR_SCORE_LABEL          0x0020
 892 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 893
 894 static inline int ipv6_saddr_preferred(int type)
 895 {
 896         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 897                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 898                 return 1;
 899         return 0;
 900 }
 901
 902 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 903                        struct in6_addr *daddr, struct in6_addr *saddr)
 904 {
 905         struct ipv6_saddr_score hiscore;
 906         struct inet6_ifaddr *ifa_result = NULL;
 907         int daddr_type = __ipv6_addr_type(daddr);
 908         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 909         int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
 910         u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
 911         struct net_device *dev;
 912
 913         memset(&hiscore, 0, sizeof(hiscore));
 914
 915         read_lock(&dev_base_lock);
 916         rcu_read_lock();
 917
 918         for_each_netdev(&init_net, dev) {
 919                 struct inet6_dev *idev;
 920                 struct inet6_ifaddr *ifa;
 921
 922                 /* Rule 0: Candidate Source Address (section 4)
 923                  *  - multicast and link-local destination address,
 924                  *    the set of candidate source address MUST only
 925                  *    include addresses assigned to interfaces
 926                  *    belonging to the same link as the outgoing
 927                  *    interface.
 928                  * (- For site-local destination addresses, the
 929                  *    set of candidate source addresses MUST only
 930                  *    include addresses assigned to interfaces
 931                  *    belonging to the same site as the outgoing
 932                  *    interface.)
 933                  */
 934                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 935                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 936                     daddr_dev && dev != daddr_dev)
 937                         continue;
 938
 939                 idev = __in6_dev_get(dev);
 940                 if (!idev)
 941                         continue;
 942
 943                 read_lock_bh(&idev->lock);
 944                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 945                         struct ipv6_saddr_score score;
 946
 947                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 948
 949                         /* Rule 0:
 950                          * - Tentative Address (RFC2462 section 5.4)
 951                          *  - A tentative address is not considered
 952                          *    "assigned to an interface" in the traditional
 953                          *    sense, unless it is also flagged as optimistic.
 954                          * - Candidate Source Address (section 4)
 955                          *  - In any case, anycast addresses, multicast
 956                          *    addresses, and the unspecified address MUST
 957                          *    NOT be included in a candidate set.
 958                          */
 959                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 960                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 961                                 continue;
 962                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 963                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 964                                 LIMIT_NETDEBUG(KERN_DEBUG
 965                                                "ADDRCONF: unspecified / multicast address "
 966                                                "assigned as unicast address on %s",
 967                                                dev->name);
 968                                 continue;
 969                         }
 970
 971                         score.attrs = 0;
 972                         score.matchlen = 0;
 973                         score.scope = 0;
 974                         score.rule = 0;
 975
 976                         if (ifa_result == NULL) {
 977                                 /* record it if the first available entry */
 978                                 goto record_it;
 979                         }
 980
 981                         /* Rule 1: Prefer same address */
 982                         if (hiscore.rule < 1) {
 983                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 984                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 985                                 hiscore.rule++;
 986                         }
 987                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 988                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 989                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 990                                         score.rule = 1;
 991                                         goto record_it;
 992                                 }
 993                         } else {
 994                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 995                                         continue;
 996                         }
 997
 998                         /* Rule 2: Prefer appropriate scope */
 999                         if (hiscore.rule < 2) {
1000                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1001                                 hiscore.rule++;
1002                         }
1003                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1004                         if (hiscore.scope < score.scope) {
1005                                 if (hiscore.scope < daddr_scope) {
1006                                         score.rule = 2;
1007                                         goto record_it;
1008                                 } else
1009                                         continue;
1010                         } else if (score.scope < hiscore.scope) {
1011                                 if (score.scope < daddr_scope)
1012                                         break; /* addresses sorted by scope */
1013                                 else {
1014                                         score.rule = 2;
1015                                         goto record_it;
1016                                 }
1017                         }
1018
1019                         /* Rule 3: Avoid deprecated and optimistic addresses */
1020                         if (hiscore.rule < 3) {
1021                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1022                                    (((ifa_result->flags &
1023                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1024                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1025                                 hiscore.rule++;
1026                         }
1027                         if (ipv6_saddr_preferred(score.addr_type) ||
1028                            (((ifa->flags &
1029                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1030                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1031                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1032                                         score.rule = 3;
1033                                         goto record_it;
1034                                 }
1035                         } else {
1036                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1037                                         continue;
1038                         }
1039
1040                         /* Rule 4: Prefer home address */
1041 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1042                         if (hiscore.rule < 4) {
1043                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1044                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1045                                 hiscore.rule++;
1046                         }
1047                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1048                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1049                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1050                                         score.rule = 4;
1051                                         goto record_it;
1052                                 }
1053                         } else {
1054                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1055                                         continue;
1056                         }
1057 #else
1058                         if (hiscore.rule < 4)
1059                                 hiscore.rule++;
1060 #endif
1061
1062                         /* Rule 5: Prefer outgoing interface */
1063                         if (hiscore.rule < 5) {
1064                                 if (daddr_dev == NULL ||
1065                                     daddr_dev == ifa_result->idev->dev)
1066                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1067                                 hiscore.rule++;
1068                         }
1069                         if (daddr_dev == NULL ||
1070                             daddr_dev == ifa->idev->dev) {
1071                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1072                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1073                                         score.rule = 5;
1074                                         goto record_it;
1075                                 }
1076                         } else {
1077                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1078                                         continue;
1079                         }
1080
1081                         /* Rule 6: Prefer matching label */
1082                         if (hiscore.rule < 6) {
1083                                 if (ipv6_addr_label(&ifa_result->addr,
1084                                                     hiscore.addr_type,
1085                                                     ifa_result->idev->dev->ifindex) == daddr_label)
1086                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1087                                 hiscore.rule++;
1088                         }
1089                         if (ipv6_addr_label(&ifa->addr,
1090                                             score.addr_type,
1091                                             ifa->idev->dev->ifindex) == daddr_label) {
1092                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1093                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1094                                         score.rule = 6;
1095                                         goto record_it;
1096                                 }
1097                         } else {
1098                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1099                                         continue;
1100                         }
1101
1102 #ifdef CONFIG_IPV6_PRIVACY
1103                         /* Rule 7: Prefer public address
1104                          * Note: prefer temprary address if use_tempaddr >= 2
1105                          */
1106                         if (hiscore.rule < 7) {
1107                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1108                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1109                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1110                                 hiscore.rule++;
1111                         }
1112                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1113                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1114                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1115                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1116                                         score.rule = 7;
1117                                         goto record_it;
1118                                 }
1119                         } else {
1120                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1121                                         continue;
1122                         }
1123 #else
1124                         if (hiscore.rule < 7)
1125                                 hiscore.rule++;
1126 #endif
1127                         /* Rule 8: Use longest matching prefix */
1128                         if (hiscore.rule < 8) {
1129                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1130                                 hiscore.rule++;
1131                         }
1132                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1133                         if (score.matchlen > hiscore.matchlen) {
1134                                 score.rule = 8;
1135                                 goto record_it;
1136                         }
1137 #if 0
1138                         else if (score.matchlen < hiscore.matchlen)
1139                                 continue;
1140 #endif
1141
1142                         /* Final Rule: choose first available one */
1143                         continue;
1144 record_it:
1145                         if (ifa_result)
1146                                 in6_ifa_put(ifa_result);
1147                         in6_ifa_hold(ifa);
1148                         ifa_result = ifa;
1149                         hiscore = score;
1150                 }
1151                 read_unlock_bh(&idev->lock);
1152         }
1153         rcu_read_unlock();
1154         read_unlock(&dev_base_lock);
1155
1156         if (!ifa_result)
1157                 return -EADDRNOTAVAIL;
1158
1159         ipv6_addr_copy(saddr, &ifa_result->addr);
1160         in6_ifa_put(ifa_result);
1161         return 0;
1162 }
1163
1164
1165 int ipv6_get_saddr(struct dst_entry *dst,
1166                    struct in6_addr *daddr, struct in6_addr *saddr)
1167 {
1168         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1169 }
1170
1171 EXPORT_SYMBOL(ipv6_get_saddr);
1172
1173 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1174                     unsigned char banned_flags)
1175 {
1176         struct inet6_dev *idev;
1177         int err = -EADDRNOTAVAIL;
1178
1179         rcu_read_lock();
1180         if ((idev = __in6_dev_get(dev)) != NULL) {
1181                 struct inet6_ifaddr *ifp;
1182
1183                 read_lock_bh(&idev->lock);
1184                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1185                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1186                                 ipv6_addr_copy(addr, &ifp->addr);
1187                                 err = 0;
1188                                 break;
1189                         }
1190                 }
1191                 read_unlock_bh(&idev->lock);
1192         }
1193         rcu_read_unlock();
1194         return err;
1195 }
1196
1197 static int ipv6_count_addresses(struct inet6_dev *idev)
1198 {
1199         int cnt = 0;
1200         struct inet6_ifaddr *ifp;
1201
1202         read_lock_bh(&idev->lock);
1203         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1204                 cnt++;
1205         read_unlock_bh(&idev->lock);
1206         return cnt;
1207 }
1208
1209 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1210                   struct net_device *dev, int strict)
1211 {
1212         struct inet6_ifaddr * ifp;
1213         u8 hash = ipv6_addr_hash(addr);
1214
1215         read_lock_bh(&addrconf_hash_lock);
1216         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1217                 if (ifp->idev->dev->nd_net != net)
1218                         continue;
1219                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1220                     !(ifp->flags&IFA_F_TENTATIVE)) {
1221                         if (dev == NULL || ifp->idev->dev == dev ||
1222                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1223                                 break;
1224                 }
1225         }
1226         read_unlock_bh(&addrconf_hash_lock);
1227         return ifp != NULL;
1228 }
1229 EXPORT_SYMBOL(ipv6_chk_addr);
1230
1231 static
1232 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1233 {
1234         struct inet6_ifaddr * ifp;
1235         u8 hash = ipv6_addr_hash(addr);
1236
1237         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1238                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1239                         if (dev == NULL || ifp->idev->dev == dev)
1240                                 break;
1241                 }
1242         }
1243         return ifp != NULL;
1244 }
1245
1246 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1247 {
1248         struct inet6_ifaddr * ifp;
1249         u8 hash = ipv6_addr_hash(addr);
1250
1251         read_lock_bh(&addrconf_hash_lock);
1252         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1253                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1254                         if (dev == NULL || ifp->idev->dev == dev ||
1255                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1256                                 in6_ifa_hold(ifp);
1257                                 break;
1258                         }
1259                 }
1260         }
1261         read_unlock_bh(&addrconf_hash_lock);
1262
1263         return ifp;
1264 }
1265
1266 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1267 {
1268         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1269         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1270         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1271         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1272         int sk_ipv6only = ipv6_only_sock(sk);
1273         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1274         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1275         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1276
1277         if (!sk2_rcv_saddr && !sk_ipv6only)
1278                 return 1;
1279
1280         if (addr_type2 == IPV6_ADDR_ANY &&
1281             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1282                 return 1;
1283
1284         if (addr_type == IPV6_ADDR_ANY &&
1285             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1286                 return 1;
1287
1288         if (sk2_rcv_saddr6 &&
1289             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1290                 return 1;
1291
1292         if (addr_type == IPV6_ADDR_MAPPED &&
1293             !sk2_ipv6only &&
1294             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1295                 return 1;
1296
1297         return 0;
1298 }
1299
1300 /* Gets referenced address, destroys ifaddr */
1301
1302 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1303 {
1304         if (ifp->flags&IFA_F_PERMANENT) {
1305                 spin_lock_bh(&ifp->lock);
1306                 addrconf_del_timer(ifp);
1307                 ifp->flags |= IFA_F_TENTATIVE;
1308                 spin_unlock_bh(&ifp->lock);
1309                 in6_ifa_put(ifp);
1310 #ifdef CONFIG_IPV6_PRIVACY
1311         } else if (ifp->flags&IFA_F_TEMPORARY) {
1312                 struct inet6_ifaddr *ifpub;
1313                 spin_lock_bh(&ifp->lock);
1314                 ifpub = ifp->ifpub;
1315                 if (ifpub) {
1316                         in6_ifa_hold(ifpub);
1317                         spin_unlock_bh(&ifp->lock);
1318                         ipv6_create_tempaddr(ifpub, ifp);
1319                         in6_ifa_put(ifpub);
1320                 } else {
1321                         spin_unlock_bh(&ifp->lock);
1322                 }
1323                 ipv6_del_addr(ifp);
1324 #endif
1325         } else
1326                 ipv6_del_addr(ifp);
1327 }
1328
1329 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1330 {
1331         if (net_ratelimit())
1332                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1333         addrconf_dad_stop(ifp);
1334 }
1335
1336 /* Join to solicited addr multicast group. */
1337
1338 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1339 {
1340         struct in6_addr maddr;
1341
1342         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1343                 return;
1344
1345         addrconf_addr_solict_mult(addr, &maddr);
1346         ipv6_dev_mc_inc(dev, &maddr);
1347 }
1348
1349 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1350 {
1351         struct in6_addr maddr;
1352
1353         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1354                 return;
1355
1356         addrconf_addr_solict_mult(addr, &maddr);
1357         __ipv6_dev_mc_dec(idev, &maddr);
1358 }
1359
1360 static void addrconf_join_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_inc(ifp->idev->dev, &addr);
1367 }
1368
1369 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1370 {
1371         struct in6_addr addr;
1372         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1373         if (ipv6_addr_any(&addr))
1374                 return;
1375         __ipv6_dev_ac_dec(ifp->idev, &addr);
1376 }
1377
1378 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1379 {
1380         if (dev->addr_len != ETH_ALEN)
1381                 return -1;
1382         memcpy(eui, dev->dev_addr, 3);
1383         memcpy(eui + 5, dev->dev_addr + 3, 3);
1384
1385         /*
1386          * The zSeries OSA network cards can be shared among various
1387          * OS instances, but the OSA cards have only one MAC address.
1388          * This leads to duplicate address conflicts in conjunction
1389          * with IPv6 if more than one instance uses the same card.
1390          *
1391          * The driver for these cards can deliver a unique 16-bit
1392          * identifier for each instance sharing the same card.  It is
1393          * placed instead of 0xFFFE in the interface identifier.  The
1394          * "u" bit of the interface identifier is not inverted in this
1395          * case.  Hence the resulting interface identifier has local
1396          * scope according to RFC2373.
1397          */
1398         if (dev->dev_id) {
1399                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1400                 eui[4] = dev->dev_id & 0xFF;
1401         } else {
1402                 eui[3] = 0xFF;
1403                 eui[4] = 0xFE;
1404                 eui[0] ^= 2;
1405         }
1406         return 0;
1407 }
1408
1409 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1410 {
1411         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1412         if (dev->addr_len != ARCNET_ALEN)
1413                 return -1;
1414         memset(eui, 0, 7);
1415         eui[7] = *(u8*)dev->dev_addr;
1416         return 0;
1417 }
1418
1419 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1420 {
1421         if (dev->addr_len != INFINIBAND_ALEN)
1422                 return -1;
1423         memcpy(eui, dev->dev_addr + 12, 8);
1424         eui[0] |= 2;
1425         return 0;
1426 }
1427
1428 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1429 {
1430         switch (dev->type) {
1431         case ARPHRD_ETHER:
1432         case ARPHRD_FDDI:
1433         case ARPHRD_IEEE802_TR:
1434                 return addrconf_ifid_eui48(eui, dev);
1435         case ARPHRD_ARCNET:
1436                 return addrconf_ifid_arcnet(eui, dev);
1437         case ARPHRD_INFINIBAND:
1438                 return addrconf_ifid_infiniband(eui, dev);
1439         case ARPHRD_SIT:
1440                 if (dev->priv_flags & IFF_ISATAP)
1441                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1442         }
1443         return -1;
1444 }
1445
1446 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1447 {
1448         int err = -1;
1449         struct inet6_ifaddr *ifp;
1450
1451         read_lock_bh(&idev->lock);
1452         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1453                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1454                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1455                         err = 0;
1456                         break;
1457                 }
1458         }
1459         read_unlock_bh(&idev->lock);
1460         return err;
1461 }
1462
1463 #ifdef CONFIG_IPV6_PRIVACY
1464 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1465 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1466 {
1467 regen:
1468         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1469         idev->rndid[0] &= ~0x02;
1470
1471         /*
1472          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1473          * check if generated address is not inappropriate
1474          *
1475          *  - Reserved subnet anycast (RFC 2526)
1476          *      11111101 11....11 1xxxxxxx
1477          *  - ISATAP (RFC4214) 6.1
1478          *      00-00-5E-FE-xx-xx-xx-xx
1479          *  - value 0
1480          *  - XXX: already assigned to an address on the device
1481          */
1482         if (idev->rndid[0] == 0xfd &&
1483             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1484             (idev->rndid[7]&0x80))
1485                 goto regen;
1486         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1487                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1488                         goto regen;
1489                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1490                         goto regen;
1491         }
1492
1493         return 0;
1494 }
1495
1496 static void ipv6_regen_rndid(unsigned long data)
1497 {
1498         struct inet6_dev *idev = (struct inet6_dev *) data;
1499         unsigned long expires;
1500
1501         rcu_read_lock_bh();
1502         write_lock_bh(&idev->lock);
1503
1504         if (idev->dead)
1505                 goto out;
1506
1507         if (__ipv6_regen_rndid(idev) < 0)
1508                 goto out;
1509
1510         expires = jiffies +
1511                 idev->cnf.temp_prefered_lft * HZ -
1512                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1513         if (time_before(expires, jiffies)) {
1514                 printk(KERN_WARNING
1515                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1516                         idev->dev->name);
1517                 goto out;
1518         }
1519
1520         if (!mod_timer(&idev->regen_timer, expires))
1521                 in6_dev_hold(idev);
1522
1523 out:
1524         write_unlock_bh(&idev->lock);
1525         rcu_read_unlock_bh();
1526         in6_dev_put(idev);
1527 }
1528
1529 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1530         int ret = 0;
1531
1532         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1533                 ret = __ipv6_regen_rndid(idev);
1534         return ret;
1535 }
1536 #endif
1537
1538 /*
1539  *      Add prefix route.
1540  */
1541
1542 static void
1543 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1544                       unsigned long expires, u32 flags)
1545 {
1546         struct fib6_config cfg = {
1547                 .fc_table = RT6_TABLE_PREFIX,
1548                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1549                 .fc_ifindex = dev->ifindex,
1550                 .fc_expires = expires,
1551                 .fc_dst_len = plen,
1552                 .fc_flags = RTF_UP | flags,
1553         };
1554
1555         ipv6_addr_copy(&cfg.fc_dst, pfx);
1556
1557         /* Prevent useless cloning on PtP SIT.
1558            This thing is done here expecting that the whole
1559            class of non-broadcast devices need not cloning.
1560          */
1561 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1562         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1563                 cfg.fc_flags |= RTF_NONEXTHOP;
1564 #endif
1565
1566         ip6_route_add(&cfg);
1567 }
1568
1569 /* Create "default" multicast route to the interface */
1570
1571 static void addrconf_add_mroute(struct net_device *dev)
1572 {
1573         struct fib6_config cfg = {
1574                 .fc_table = RT6_TABLE_LOCAL,
1575                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1576                 .fc_ifindex = dev->ifindex,
1577                 .fc_dst_len = 8,
1578                 .fc_flags = RTF_UP,
1579         };
1580
1581         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1582
1583         ip6_route_add(&cfg);
1584 }
1585
1586 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1587 static void sit_route_add(struct net_device *dev)
1588 {
1589         struct fib6_config cfg = {
1590                 .fc_table = RT6_TABLE_MAIN,
1591                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1592                 .fc_ifindex = dev->ifindex,
1593                 .fc_dst_len = 96,
1594                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1595         };
1596
1597         /* prefix length - 96 bits "::d.d.d.d" */
1598         ip6_route_add(&cfg);
1599 }
1600 #endif
1601
1602 static void addrconf_add_lroute(struct net_device *dev)
1603 {
1604         struct in6_addr addr;
1605
1606         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1607         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1608 }
1609
1610 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1611 {
1612         struct inet6_dev *idev;
1613
1614         ASSERT_RTNL();
1615
1616         if ((idev = ipv6_find_idev(dev)) == NULL)
1617                 return NULL;
1618
1619         /* Add default multicast route */
1620         addrconf_add_mroute(dev);
1621
1622         /* Add link local route */
1623         addrconf_add_lroute(dev);
1624         return idev;
1625 }
1626
1627 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1628 {
1629         struct prefix_info *pinfo;
1630         __u32 valid_lft;
1631         __u32 prefered_lft;
1632         int addr_type;
1633         unsigned long rt_expires;
1634         struct inet6_dev *in6_dev;
1635
1636         pinfo = (struct prefix_info *) opt;
1637
1638         if (len < sizeof(struct prefix_info)) {
1639                 ADBG(("addrconf: prefix option too short\n"));
1640                 return;
1641         }
1642
1643         /*
1644          *      Validation checks ([ADDRCONF], page 19)
1645          */
1646
1647         addr_type = ipv6_addr_type(&pinfo->prefix);
1648
1649         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1650                 return;
1651
1652         valid_lft = ntohl(pinfo->valid);
1653         prefered_lft = ntohl(pinfo->prefered);
1654
1655         if (prefered_lft > valid_lft) {
1656                 if (net_ratelimit())
1657                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1658                 return;
1659         }
1660
1661         in6_dev = in6_dev_get(dev);
1662
1663         if (in6_dev == NULL) {
1664                 if (net_ratelimit())
1665                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1666                 return;
1667         }
1668
1669         /*
1670          *      Two things going on here:
1671          *      1) Add routes for on-link prefixes
1672          *      2) Configure prefixes with the auto flag set
1673          */
1674
1675         /* Avoid arithmetic overflow. Really, we could
1676            save rt_expires in seconds, likely valid_lft,
1677            but it would require division in fib gc, that it
1678            not good.
1679          */
1680         if (valid_lft >= 0x7FFFFFFF/HZ)
1681                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1682         else
1683                 rt_expires = valid_lft * HZ;
1684
1685         /*
1686          * We convert this (in jiffies) to clock_t later.
1687          * Avoid arithmetic overflow there as well.
1688          * Overflow can happen only if HZ < USER_HZ.
1689          */
1690         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1691                 rt_expires = 0x7FFFFFFF / USER_HZ;
1692
1693         if (pinfo->onlink) {
1694                 struct rt6_info *rt;
1695                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1696
1697                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1698                         if (rt->rt6i_flags&RTF_EXPIRES) {
1699                                 if (valid_lft == 0) {
1700                                         ip6_del_rt(rt);
1701                                         rt = NULL;
1702                                 } else {
1703                                         rt->rt6i_expires = jiffies + rt_expires;
1704                                 }
1705                         }
1706                 } else if (valid_lft) {
1707                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1708                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1709                 }
1710                 if (rt)
1711                         dst_release(&rt->u.dst);
1712         }
1713
1714         /* Try to figure out our local address for this prefix */
1715
1716         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1717                 struct inet6_ifaddr * ifp;
1718                 struct in6_addr addr;
1719                 int create = 0, update_lft = 0;
1720
1721                 if (pinfo->prefix_len == 64) {
1722                         memcpy(&addr, &pinfo->prefix, 8);
1723                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1724                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1725                                 in6_dev_put(in6_dev);
1726                                 return;
1727                         }
1728                         goto ok;
1729                 }
1730                 if (net_ratelimit())
1731                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1732                                pinfo->prefix_len);
1733                 in6_dev_put(in6_dev);
1734                 return;
1735
1736 ok:
1737
1738                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1739
1740                 if (ifp == NULL && valid_lft) {
1741                         int max_addresses = in6_dev->cnf.max_addresses;
1742                         u32 addr_flags = 0;
1743
1744 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1745                         if (in6_dev->cnf.optimistic_dad &&
1746                             !ipv6_devconf.forwarding)
1747                                 addr_flags = IFA_F_OPTIMISTIC;
1748 #endif
1749
1750                         /* Do not allow to create too much of autoconfigured
1751                          * addresses; this would be too easy way to crash kernel.
1752                          */
1753                         if (!max_addresses ||
1754                             ipv6_count_addresses(in6_dev) < max_addresses)
1755                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1756                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1757                                                     addr_flags);
1758
1759                         if (!ifp || IS_ERR(ifp)) {
1760                                 in6_dev_put(in6_dev);
1761                                 return;
1762                         }
1763
1764                         update_lft = create = 1;
1765                         ifp->cstamp = jiffies;
1766                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1767                 }
1768
1769                 if (ifp) {
1770                         int flags;
1771                         unsigned long now;
1772 #ifdef CONFIG_IPV6_PRIVACY
1773                         struct inet6_ifaddr *ift;
1774 #endif
1775                         u32 stored_lft;
1776
1777                         /* update lifetime (RFC2462 5.5.3 e) */
1778                         spin_lock(&ifp->lock);
1779                         now = jiffies;
1780                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1781                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1782                         else
1783                                 stored_lft = 0;
1784                         if (!update_lft && stored_lft) {
1785                                 if (valid_lft > MIN_VALID_LIFETIME ||
1786                                     valid_lft > stored_lft)
1787                                         update_lft = 1;
1788                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1789                                         /* valid_lft <= stored_lft is always true */
1790                                         /* XXX: IPsec */
1791                                         update_lft = 0;
1792                                 } else {
1793                                         valid_lft = MIN_VALID_LIFETIME;
1794                                         if (valid_lft < prefered_lft)
1795                                                 prefered_lft = valid_lft;
1796                                         update_lft = 1;
1797                                 }
1798                         }
1799
1800                         if (update_lft) {
1801                                 ifp->valid_lft = valid_lft;
1802                                 ifp->prefered_lft = prefered_lft;
1803                                 ifp->tstamp = now;
1804                                 flags = ifp->flags;
1805                                 ifp->flags &= ~IFA_F_DEPRECATED;
1806                                 spin_unlock(&ifp->lock);
1807
1808                                 if (!(flags&IFA_F_TENTATIVE))
1809                                         ipv6_ifa_notify(0, ifp);
1810                         } else
1811                                 spin_unlock(&ifp->lock);
1812
1813 #ifdef CONFIG_IPV6_PRIVACY
1814                         read_lock_bh(&in6_dev->lock);
1815                         /* update all temporary addresses in the list */
1816                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1817                                 /*
1818                                  * When adjusting the lifetimes of an existing
1819                                  * temporary address, only lower the lifetimes.
1820                                  * Implementations must not increase the
1821                                  * lifetimes of an existing temporary address
1822                                  * when processing a Prefix Information Option.
1823                                  */
1824                                 spin_lock(&ift->lock);
1825                                 flags = ift->flags;
1826                                 if (ift->valid_lft > valid_lft &&
1827                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1828                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1829                                 if (ift->prefered_lft > prefered_lft &&
1830                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1831                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1832                                 spin_unlock(&ift->lock);
1833                                 if (!(flags&IFA_F_TENTATIVE))
1834                                         ipv6_ifa_notify(0, ift);
1835                         }
1836
1837                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1838                                 /*
1839                                  * When a new public address is created as described in [ADDRCONF],
1840                                  * also create a new temporary address.
1841                                  */
1842                                 read_unlock_bh(&in6_dev->lock);
1843                                 ipv6_create_tempaddr(ifp, NULL);
1844                         } else {
1845                                 read_unlock_bh(&in6_dev->lock);
1846                         }
1847 #endif
1848                         in6_ifa_put(ifp);
1849                         addrconf_verify(0);
1850                 }
1851         }
1852         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1853         in6_dev_put(in6_dev);
1854 }
1855
1856 /*
1857  *      Set destination address.
1858  *      Special case for SIT interfaces where we create a new "virtual"
1859  *      device.
1860  */
1861 int addrconf_set_dstaddr(void __user *arg)
1862 {
1863         struct in6_ifreq ireq;
1864         struct net_device *dev;
1865         int err = -EINVAL;
1866
1867         rtnl_lock();
1868
1869         err = -EFAULT;
1870         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1871                 goto err_exit;
1872
1873         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1874
1875         err = -ENODEV;
1876         if (dev == NULL)
1877                 goto err_exit;
1878
1879 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1880         if (dev->type == ARPHRD_SIT) {
1881                 struct ifreq ifr;
1882                 mm_segment_t    oldfs;
1883                 struct ip_tunnel_parm p;
1884
1885                 err = -EADDRNOTAVAIL;
1886                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1887                         goto err_exit;
1888
1889                 memset(&p, 0, sizeof(p));
1890                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1891                 p.iph.saddr = 0;
1892                 p.iph.version = 4;
1893                 p.iph.ihl = 5;
1894                 p.iph.protocol = IPPROTO_IPV6;
1895                 p.iph.ttl = 64;
1896                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1897
1898                 oldfs = get_fs(); set_fs(KERNEL_DS);
1899                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1900                 set_fs(oldfs);
1901
1902                 if (err == 0) {
1903                         err = -ENOBUFS;
1904                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1905                                 goto err_exit;
1906                         err = dev_open(dev);
1907                 }
1908         }
1909 #endif
1910
1911 err_exit:
1912         rtnl_unlock();
1913         return err;
1914 }
1915
1916 /*
1917  *      Manual configuration of address on an interface
1918  */
1919 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1920                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1921 {
1922         struct inet6_ifaddr *ifp;
1923         struct inet6_dev *idev;
1924         struct net_device *dev;
1925         int scope;
1926         u32 flags = RTF_EXPIRES;
1927
1928         ASSERT_RTNL();
1929
1930         /* check the lifetime */
1931         if (!valid_lft || prefered_lft > valid_lft)
1932                 return -EINVAL;
1933
1934         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1935                 return -ENODEV;
1936
1937         if ((idev = addrconf_add_dev(dev)) == NULL)
1938                 return -ENOBUFS;
1939
1940         scope = ipv6_addr_scope(pfx);
1941
1942         if (valid_lft == INFINITY_LIFE_TIME) {
1943                 ifa_flags |= IFA_F_PERMANENT;
1944                 flags = 0;
1945         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1946                 valid_lft = 0x7FFFFFFF/HZ;
1947
1948         if (prefered_lft == 0)
1949                 ifa_flags |= IFA_F_DEPRECATED;
1950         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1951                  (prefered_lft != INFINITY_LIFE_TIME))
1952                 prefered_lft = 0x7FFFFFFF/HZ;
1953
1954         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1955
1956         if (!IS_ERR(ifp)) {
1957                 spin_lock_bh(&ifp->lock);
1958                 ifp->valid_lft = valid_lft;
1959                 ifp->prefered_lft = prefered_lft;
1960                 ifp->tstamp = jiffies;
1961                 spin_unlock_bh(&ifp->lock);
1962
1963                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1964                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1965                 /*
1966                  * Note that section 3.1 of RFC 4429 indicates
1967                  * that the Optimistic flag should not be set for
1968                  * manually configured addresses
1969                  */
1970                 addrconf_dad_start(ifp, 0);
1971                 in6_ifa_put(ifp);
1972                 addrconf_verify(0);
1973                 return 0;
1974         }
1975
1976         return PTR_ERR(ifp);
1977 }
1978
1979 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1980 {
1981         struct inet6_ifaddr *ifp;
1982         struct inet6_dev *idev;
1983         struct net_device *dev;
1984
1985         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1986                 return -ENODEV;
1987
1988         if ((idev = __in6_dev_get(dev)) == NULL)
1989                 return -ENXIO;
1990
1991         read_lock_bh(&idev->lock);
1992         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1993                 if (ifp->prefix_len == plen &&
1994                     ipv6_addr_equal(pfx, &ifp->addr)) {
1995                         in6_ifa_hold(ifp);
1996                         read_unlock_bh(&idev->lock);
1997
1998                         ipv6_del_addr(ifp);
1999
2000                         /* If the last address is deleted administratively,
2001                            disable IPv6 on this interface.
2002                          */
2003                         if (idev->addr_list == NULL)
2004                                 addrconf_ifdown(idev->dev, 1);
2005                         return 0;
2006                 }
2007         }
2008         read_unlock_bh(&idev->lock);
2009         return -EADDRNOTAVAIL;
2010 }
2011
2012
2013 int addrconf_add_ifaddr(void __user *arg)
2014 {
2015         struct in6_ifreq ireq;
2016         int err;
2017
2018         if (!capable(CAP_NET_ADMIN))
2019                 return -EPERM;
2020
2021         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2022                 return -EFAULT;
2023
2024         rtnl_lock();
2025         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2026                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2027         rtnl_unlock();
2028         return err;
2029 }
2030
2031 int addrconf_del_ifaddr(void __user *arg)
2032 {
2033         struct in6_ifreq ireq;
2034         int err;
2035
2036         if (!capable(CAP_NET_ADMIN))
2037                 return -EPERM;
2038
2039         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2040                 return -EFAULT;
2041
2042         rtnl_lock();
2043         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2044         rtnl_unlock();
2045         return err;
2046 }
2047
2048 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2049 static void sit_add_v4_addrs(struct inet6_dev *idev)
2050 {
2051         struct inet6_ifaddr * ifp;
2052         struct in6_addr addr;
2053         struct net_device *dev;
2054         int scope;
2055
2056         ASSERT_RTNL();
2057
2058         memset(&addr, 0, sizeof(struct in6_addr));
2059         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2060
2061         if (idev->dev->flags&IFF_POINTOPOINT) {
2062                 addr.s6_addr32[0] = htonl(0xfe800000);
2063                 scope = IFA_LINK;
2064         } else {
2065                 scope = IPV6_ADDR_COMPATv4;
2066         }
2067
2068         if (addr.s6_addr32[3]) {
2069                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2070                 if (!IS_ERR(ifp)) {
2071                         spin_lock_bh(&ifp->lock);
2072                         ifp->flags &= ~IFA_F_TENTATIVE;
2073                         spin_unlock_bh(&ifp->lock);
2074                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2075                         in6_ifa_put(ifp);
2076                 }
2077                 return;
2078         }
2079
2080         for_each_netdev(&init_net, dev) {
2081                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2082                 if (in_dev && (dev->flags & IFF_UP)) {
2083                         struct in_ifaddr * ifa;
2084
2085                         int flag = scope;
2086
2087                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2088                                 int plen;
2089
2090                                 addr.s6_addr32[3] = ifa->ifa_local;
2091
2092                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2093                                         continue;
2094                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2095                                         if (idev->dev->flags&IFF_POINTOPOINT)
2096                                                 continue;
2097                                         flag |= IFA_HOST;
2098                                 }
2099                                 if (idev->dev->flags&IFF_POINTOPOINT)
2100                                         plen = 64;
2101                                 else
2102                                         plen = 96;
2103
2104                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2105                                                     IFA_F_PERMANENT);
2106                                 if (!IS_ERR(ifp)) {
2107                                         spin_lock_bh(&ifp->lock);
2108                                         ifp->flags &= ~IFA_F_TENTATIVE;
2109                                         spin_unlock_bh(&ifp->lock);
2110                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2111                                         in6_ifa_put(ifp);
2112                                 }
2113                         }
2114                 }
2115         }
2116 }
2117 #endif
2118
2119 static void init_loopback(struct net_device *dev)
2120 {
2121         struct inet6_dev  *idev;
2122         struct inet6_ifaddr * ifp;
2123
2124         /* ::1 */
2125
2126         ASSERT_RTNL();
2127
2128         if ((idev = ipv6_find_idev(dev)) == NULL) {
2129                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2130                 return;
2131         }
2132
2133         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2134         if (!IS_ERR(ifp)) {
2135                 spin_lock_bh(&ifp->lock);
2136                 ifp->flags &= ~IFA_F_TENTATIVE;
2137                 spin_unlock_bh(&ifp->lock);
2138                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2139                 in6_ifa_put(ifp);
2140         }
2141 }
2142
2143 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2144 {
2145         struct inet6_ifaddr * ifp;
2146         u32 addr_flags = IFA_F_PERMANENT;
2147
2148 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2149         if (idev->cnf.optimistic_dad &&
2150             !ipv6_devconf.forwarding)
2151                 addr_flags |= IFA_F_OPTIMISTIC;
2152 #endif
2153
2154
2155         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2156         if (!IS_ERR(ifp)) {
2157                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2158                 addrconf_dad_start(ifp, 0);
2159                 in6_ifa_put(ifp);
2160         }
2161 }
2162
2163 static void addrconf_dev_config(struct net_device *dev)
2164 {
2165         struct in6_addr addr;
2166         struct inet6_dev    * idev;
2167
2168         ASSERT_RTNL();
2169
2170         if ((dev->type != ARPHRD_ETHER) &&
2171             (dev->type != ARPHRD_FDDI) &&
2172             (dev->type != ARPHRD_IEEE802_TR) &&
2173             (dev->type != ARPHRD_ARCNET) &&
2174             (dev->type != ARPHRD_INFINIBAND)) {
2175                 /* Alas, we support only Ethernet autoconfiguration. */
2176                 return;
2177         }
2178
2179         idev = addrconf_add_dev(dev);
2180         if (idev == NULL)
2181                 return;
2182
2183         memset(&addr, 0, sizeof(struct in6_addr));
2184         addr.s6_addr32[0] = htonl(0xFE800000);
2185
2186         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2187                 addrconf_add_linklocal(idev, &addr);
2188 }
2189
2190 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2191 static void addrconf_sit_config(struct net_device *dev)
2192 {
2193         struct inet6_dev *idev;
2194
2195         ASSERT_RTNL();
2196
2197         /*
2198          * Configure the tunnel with one of our IPv4
2199          * addresses... we should configure all of
2200          * our v4 addrs in the tunnel
2201          */
2202
2203         if ((idev = ipv6_find_idev(dev)) == NULL) {
2204                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2205                 return;
2206         }
2207
2208         if (dev->priv_flags & IFF_ISATAP) {
2209                 struct in6_addr addr;
2210
2211                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2212                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2213                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2214                         addrconf_add_linklocal(idev, &addr);
2215                 return;
2216         }
2217
2218         sit_add_v4_addrs(idev);
2219
2220         if (dev->flags&IFF_POINTOPOINT) {
2221                 addrconf_add_mroute(dev);
2222                 addrconf_add_lroute(dev);
2223         } else
2224                 sit_route_add(dev);
2225 }
2226 #endif
2227
2228 static inline int
2229 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2230 {
2231         struct in6_addr lladdr;
2232
2233         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2234                 addrconf_add_linklocal(idev, &lladdr);
2235                 return 0;
2236         }
2237         return -1;
2238 }
2239
2240 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2241 {
2242         struct net_device *link_dev;
2243
2244         /* first try to inherit the link-local address from the link device */
2245         if (idev->dev->iflink &&
2246             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2247                 if (!ipv6_inherit_linklocal(idev, link_dev))
2248                         return;
2249         }
2250         /* then try to inherit it from any device */
2251         for_each_netdev(&init_net, link_dev) {
2252                 if (!ipv6_inherit_linklocal(idev, link_dev))
2253                         return;
2254         }
2255         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2256 }
2257
2258 /*
2259  * Autoconfigure tunnel with a link-local address so routing protocols,
2260  * DHCPv6, MLD etc. can be run over the virtual link
2261  */
2262
2263 static void addrconf_ip6_tnl_config(struct net_device *dev)
2264 {
2265         struct inet6_dev *idev;
2266
2267         ASSERT_RTNL();
2268
2269         if ((idev = addrconf_add_dev(dev)) == NULL) {
2270                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2271                 return;
2272         }
2273         ip6_tnl_add_linklocal(idev);
2274 }
2275
2276 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2277                            void * data)
2278 {
2279         struct net_device *dev = (struct net_device *) data;
2280         struct inet6_dev *idev = __in6_dev_get(dev);
2281         int run_pending = 0;
2282         int err;
2283
2284         if (dev->nd_net != &init_net)
2285                 return NOTIFY_DONE;
2286
2287         switch(event) {
2288         case NETDEV_REGISTER:
2289                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2290                         idev = ipv6_add_dev(dev);
2291                         if (!idev)
2292                                 return notifier_from_errno(-ENOMEM);
2293                 }
2294                 break;
2295         case NETDEV_UP:
2296         case NETDEV_CHANGE:
2297                 if (dev->flags & IFF_SLAVE)
2298                         break;
2299
2300                 if (event == NETDEV_UP) {
2301                         if (!addrconf_qdisc_ok(dev)) {
2302                                 /* device is not ready yet. */
2303                                 printk(KERN_INFO
2304                                         "ADDRCONF(NETDEV_UP): %s: "
2305                                         "link is not ready\n",
2306                                         dev->name);
2307                                 break;
2308                         }
2309
2310                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2311                                 idev = ipv6_add_dev(dev);
2312
2313                         if (idev)
2314                                 idev->if_flags |= IF_READY;
2315                 } else {
2316                         if (!addrconf_qdisc_ok(dev)) {
2317                                 /* device is still not ready. */
2318                                 break;
2319                         }
2320
2321                         if (idev) {
2322                                 if (idev->if_flags & IF_READY) {
2323                                         /* device is already configured. */
2324                                         break;
2325                                 }
2326                                 idev->if_flags |= IF_READY;
2327                         }
2328
2329                         printk(KERN_INFO
2330                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2331                                         "link becomes ready\n",
2332                                         dev->name);
2333
2334                         run_pending = 1;
2335                 }
2336
2337                 switch(dev->type) {
2338 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2339                 case ARPHRD_SIT:
2340                         addrconf_sit_config(dev);
2341                         break;
2342 #endif
2343                 case ARPHRD_TUNNEL6:
2344                         addrconf_ip6_tnl_config(dev);
2345                         break;
2346                 case ARPHRD_LOOPBACK:
2347                         init_loopback(dev);
2348                         break;
2349
2350                 default:
2351                         addrconf_dev_config(dev);
2352                         break;
2353                 }
2354                 if (idev) {
2355                         if (run_pending)
2356                                 addrconf_dad_run(idev);
2357
2358                         /* If the MTU changed during the interface down, when the
2359                            interface up, the changed MTU must be reflected in the
2360                            idev as well as routers.
2361                          */
2362                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2363                                 rt6_mtu_change(dev, dev->mtu);
2364                                 idev->cnf.mtu6 = dev->mtu;
2365                         }
2366                         idev->tstamp = jiffies;
2367                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2368                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2369                            stop IPv6 on this interface.
2370                          */
2371                         if (dev->mtu < IPV6_MIN_MTU)
2372                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2373                 }
2374                 break;
2375
2376         case NETDEV_CHANGEMTU:
2377                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2378                         rt6_mtu_change(dev, dev->mtu);
2379                         idev->cnf.mtu6 = dev->mtu;
2380                         break;
2381                 }
2382
2383                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2384                         idev = ipv6_add_dev(dev);
2385                         if (idev)
2386                                 break;
2387                 }
2388
2389                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2390
2391         case NETDEV_DOWN:
2392         case NETDEV_UNREGISTER:
2393                 /*
2394                  *      Remove all addresses from this interface.
2395                  */
2396                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2397                 break;
2398
2399         case NETDEV_CHANGENAME:
2400                 if (idev) {
2401                         snmp6_unregister_dev(idev);
2402                         addrconf_sysctl_unregister(idev);
2403                         addrconf_sysctl_register(idev);
2404                         err = snmp6_register_dev(idev);
2405                         if (err)
2406                                 return notifier_from_errno(err);
2407                 }
2408                 break;
2409         }
2410
2411         return NOTIFY_OK;
2412 }
2413
2414 /*
2415  *      addrconf module should be notified of a device going up
2416  */
2417 static struct notifier_block ipv6_dev_notf = {
2418         .notifier_call = addrconf_notify,
2419         .priority = 0
2420 };
2421
2422 static int addrconf_ifdown(struct net_device *dev, int how)
2423 {
2424         struct inet6_dev *idev;
2425         struct inet6_ifaddr *ifa, **bifa;
2426         int i;
2427
2428         ASSERT_RTNL();
2429
2430         if (dev == init_net.loopback_dev && how == 1)
2431                 how = 0;
2432
2433         rt6_ifdown(dev);
2434         neigh_ifdown(&nd_tbl, dev);
2435
2436         idev = __in6_dev_get(dev);
2437         if (idev == NULL)
2438                 return -ENODEV;
2439
2440         /* Step 1: remove reference to ipv6 device from parent device.
2441                    Do not dev_put!
2442          */
2443         if (how == 1) {
2444                 idev->dead = 1;
2445
2446                 /* protected by rtnl_lock */
2447                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2448
2449                 /* Step 1.5: remove snmp6 entry */
2450                 snmp6_unregister_dev(idev);
2451
2452         }
2453
2454         /* Step 2: clear hash table */
2455         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2456                 bifa = &inet6_addr_lst[i];
2457
2458                 write_lock_bh(&addrconf_hash_lock);
2459                 while ((ifa = *bifa) != NULL) {
2460                         if (ifa->idev == idev) {
2461                                 *bifa = ifa->lst_next;
2462                                 ifa->lst_next = NULL;
2463                                 addrconf_del_timer(ifa);
2464                                 in6_ifa_put(ifa);
2465                                 continue;
2466                         }
2467                         bifa = &ifa->lst_next;
2468                 }
2469                 write_unlock_bh(&addrconf_hash_lock);
2470         }
2471
2472         write_lock_bh(&idev->lock);
2473
2474         /* Step 3: clear flags for stateless addrconf */
2475         if (how != 1)
2476                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2477
2478         /* Step 4: clear address list */
2479 #ifdef CONFIG_IPV6_PRIVACY
2480         if (how == 1 && del_timer(&idev->regen_timer))
2481                 in6_dev_put(idev);
2482
2483         /* clear tempaddr list */
2484         while ((ifa = idev->tempaddr_list) != NULL) {
2485                 idev->tempaddr_list = ifa->tmp_next;
2486                 ifa->tmp_next = NULL;
2487                 ifa->dead = 1;
2488                 write_unlock_bh(&idev->lock);
2489                 spin_lock_bh(&ifa->lock);
2490
2491                 if (ifa->ifpub) {
2492                         in6_ifa_put(ifa->ifpub);
2493                         ifa->ifpub = NULL;
2494                 }
2495                 spin_unlock_bh(&ifa->lock);
2496                 in6_ifa_put(ifa);
2497                 write_lock_bh(&idev->lock);
2498         }
2499 #endif
2500         while ((ifa = idev->addr_list) != NULL) {
2501                 idev->addr_list = ifa->if_next;
2502                 ifa->if_next = NULL;
2503                 ifa->dead = 1;
2504                 addrconf_del_timer(ifa);
2505                 write_unlock_bh(&idev->lock);
2506
2507                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2508                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2509                 in6_ifa_put(ifa);
2510
2511                 write_lock_bh(&idev->lock);
2512         }
2513         write_unlock_bh(&idev->lock);
2514
2515         /* Step 5: Discard multicast list */
2516
2517         if (how == 1)
2518                 ipv6_mc_destroy_dev(idev);
2519         else
2520                 ipv6_mc_down(idev);
2521
2522         idev->tstamp = jiffies;
2523
2524         /* Shot the device (if unregistered) */
2525
2526         if (how == 1) {
2527                 addrconf_sysctl_unregister(idev);
2528                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2529                 neigh_ifdown(&nd_tbl, dev);
2530                 in6_dev_put(idev);
2531         }
2532         return 0;
2533 }
2534
2535 static void addrconf_rs_timer(unsigned long data)
2536 {
2537         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2538
2539         if (ifp->idev->cnf.forwarding)
2540                 goto out;
2541
2542         if (ifp->idev->if_flags & IF_RA_RCVD) {
2543                 /*
2544                  *      Announcement received after solicitation
2545                  *      was sent
2546                  */
2547                 goto out;
2548         }
2549
2550         spin_lock(&ifp->lock);
2551         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2552                 struct in6_addr all_routers;
2553
2554                 /* The wait after the last probe can be shorter */
2555                 addrconf_mod_timer(ifp, AC_RS,
2556                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2557                                    ifp->idev->cnf.rtr_solicit_delay :
2558                                    ifp->idev->cnf.rtr_solicit_interval);
2559                 spin_unlock(&ifp->lock);
2560
2561                 ipv6_addr_all_routers(&all_routers);
2562
2563                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2564         } else {
2565                 spin_unlock(&ifp->lock);
2566                 /*
2567                  * Note: we do not support deprecated "all on-link"
2568                  * assumption any longer.
2569                  */
2570                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2571                        ifp->idev->dev->name);
2572         }
2573
2574 out:
2575         in6_ifa_put(ifp);
2576 }
2577
2578 /*
2579  *      Duplicate Address Detection
2580  */
2581 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2582 {
2583         unsigned long rand_num;
2584         struct inet6_dev *idev = ifp->idev;
2585
2586         if (ifp->flags & IFA_F_OPTIMISTIC)
2587                 rand_num = 0;
2588         else
2589                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2590
2591         ifp->probes = idev->cnf.dad_transmits;
2592         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2593 }
2594
2595 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2596 {
2597         struct inet6_dev *idev = ifp->idev;
2598         struct net_device *dev = idev->dev;
2599
2600         addrconf_join_solict(dev, &ifp->addr);
2601
2602         net_srandom(ifp->addr.s6_addr32[3]);
2603
2604         read_lock_bh(&idev->lock);
2605         if (ifp->dead)
2606                 goto out;
2607         spin_lock_bh(&ifp->lock);
2608
2609         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2610             !(ifp->flags&IFA_F_TENTATIVE) ||
2611             ifp->flags & IFA_F_NODAD) {
2612                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2613                 spin_unlock_bh(&ifp->lock);
2614                 read_unlock_bh(&idev->lock);
2615
2616                 addrconf_dad_completed(ifp);
2617                 return;
2618         }
2619
2620         if (!(idev->if_flags & IF_READY)) {
2621                 spin_unlock_bh(&ifp->lock);
2622                 read_unlock_bh(&idev->lock);
2623                 /*
2624                  * If the defice is not ready:
2625                  * - keep it tentative if it is a permanent address.
2626                  * - otherwise, kill it.
2627                  */
2628                 in6_ifa_hold(ifp);
2629                 addrconf_dad_stop(ifp);
2630                 return;
2631         }
2632
2633         /*
2634          * Optimistic nodes can start receiving
2635          * Frames right away
2636          */
2637         if(ifp->flags & IFA_F_OPTIMISTIC)
2638                 ip6_ins_rt(ifp->rt);
2639
2640         addrconf_dad_kick(ifp);
2641         spin_unlock_bh(&ifp->lock);
2642 out:
2643         read_unlock_bh(&idev->lock);
2644 }
2645
2646 static void addrconf_dad_timer(unsigned long data)
2647 {
2648         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2649         struct inet6_dev *idev = ifp->idev;
2650         struct in6_addr unspec;
2651         struct in6_addr mcaddr;
2652
2653         read_lock_bh(&idev->lock);
2654         if (idev->dead) {
2655                 read_unlock_bh(&idev->lock);
2656                 goto out;
2657         }
2658         spin_lock_bh(&ifp->lock);
2659         if (ifp->probes == 0) {
2660                 /*
2661                  * DAD was successful
2662                  */
2663
2664                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2665                 spin_unlock_bh(&ifp->lock);
2666                 read_unlock_bh(&idev->lock);
2667
2668                 addrconf_dad_completed(ifp);
2669
2670                 goto out;
2671         }
2672
2673         ifp->probes--;
2674         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2675         spin_unlock_bh(&ifp->lock);
2676         read_unlock_bh(&idev->lock);
2677
2678         /* send a neighbour solicitation for our addr */
2679         memset(&unspec, 0, sizeof(unspec));
2680         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2681         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2682 out:
2683         in6_ifa_put(ifp);
2684 }
2685
2686 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2687 {
2688         struct net_device *     dev = ifp->idev->dev;
2689
2690         /*
2691          *      Configure the address for reception. Now it is valid.
2692          */
2693
2694         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2695
2696         /* If added prefix is link local and forwarding is off,
2697            start sending router solicitations.
2698          */
2699
2700         if (ifp->idev->cnf.forwarding == 0 &&
2701             ifp->idev->cnf.rtr_solicits > 0 &&
2702             (dev->flags&IFF_LOOPBACK) == 0 &&
2703             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2704                 struct in6_addr all_routers;
2705
2706                 ipv6_addr_all_routers(&all_routers);
2707
2708                 /*
2709                  *      If a host as already performed a random delay
2710                  *      [...] as part of DAD [...] there is no need
2711                  *      to delay again before sending the first RS
2712                  */
2713                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2714
2715                 spin_lock_bh(&ifp->lock);
2716                 ifp->probes = 1;
2717                 ifp->idev->if_flags |= IF_RS_SENT;
2718                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2719                 spin_unlock_bh(&ifp->lock);
2720         }
2721 }
2722
2723 static void addrconf_dad_run(struct inet6_dev *idev) {
2724         struct inet6_ifaddr *ifp;
2725
2726         read_lock_bh(&idev->lock);
2727         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2728                 spin_lock_bh(&ifp->lock);
2729                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2730                         spin_unlock_bh(&ifp->lock);
2731                         continue;
2732                 }
2733                 spin_unlock_bh(&ifp->lock);
2734                 addrconf_dad_kick(ifp);
2735         }
2736         read_unlock_bh(&idev->lock);
2737 }
2738
2739 #ifdef CONFIG_PROC_FS
2740 struct if6_iter_state {
2741         struct seq_net_private p;
2742         int bucket;
2743 };
2744
2745 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2746 {
2747         struct inet6_ifaddr *ifa = NULL;
2748         struct if6_iter_state *state = seq->private;
2749         struct net *net = state->p.net;
2750
2751         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2752                 ifa = inet6_addr_lst[state->bucket];
2753
2754                 while (ifa && ifa->idev->dev->nd_net != net)
2755                         ifa = ifa->lst_next;
2756                 if (ifa)
2757                         break;
2758         }
2759         return ifa;
2760 }
2761
2762 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2763 {
2764         struct if6_iter_state *state = seq->private;
2765         struct net *net = state->p.net;
2766
2767         ifa = ifa->lst_next;
2768 try_again:
2769         if (ifa) {
2770                 if (ifa->idev->dev->nd_net != net) {
2771                         ifa = ifa->lst_next;
2772                         goto try_again;
2773                 }
2774         }
2775
2776         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2777                 ifa = inet6_addr_lst[state->bucket];
2778                 goto try_again;
2779         }
2780
2781         return ifa;
2782 }
2783
2784 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2785 {
2786         struct inet6_ifaddr *ifa = if6_get_first(seq);
2787
2788         if (ifa)
2789                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2790                         --pos;
2791         return pos ? NULL : ifa;
2792 }
2793
2794 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2795 {
2796         read_lock_bh(&addrconf_hash_lock);
2797         return if6_get_idx(seq, *pos);
2798 }
2799
2800 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2801 {
2802         struct inet6_ifaddr *ifa;
2803
2804         ifa = if6_get_next(seq, v);
2805         ++*pos;
2806         return ifa;
2807 }
2808
2809 static void if6_seq_stop(struct seq_file *seq, void *v)
2810 {
2811         read_unlock_bh(&addrconf_hash_lock);
2812 }
2813
2814 static int if6_seq_show(struct seq_file *seq, void *v)
2815 {
2816         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2817         seq_printf(seq,
2818                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2819                    NIP6(ifp->addr),
2820                    ifp->idev->dev->ifindex,
2821                    ifp->prefix_len,
2822                    ifp->scope,
2823                    ifp->flags,
2824                    ifp->idev->dev->name);
2825         return 0;
2826 }
2827
2828 static const struct seq_operations if6_seq_ops = {
2829         .start  = if6_seq_start,
2830         .next   = if6_seq_next,
2831         .show   = if6_seq_show,
2832         .stop   = if6_seq_stop,
2833 };
2834
2835 static int if6_seq_open(struct inode *inode, struct file *file)
2836 {
2837         return seq_open_net(inode, file, &if6_seq_ops,
2838                             sizeof(struct if6_iter_state));
2839 }
2840
2841 static const struct file_operations if6_fops = {
2842         .owner          = THIS_MODULE,
2843         .open           = if6_seq_open,
2844         .read           = seq_read,
2845         .llseek         = seq_lseek,
2846         .release        = seq_release_net,
2847 };
2848
2849 static int if6_proc_net_init(struct net *net)
2850 {
2851         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2852                 return -ENOMEM;
2853         return 0;
2854 }
2855
2856 static void if6_proc_net_exit(struct net *net)
2857 {
2858        proc_net_remove(net, "if_inet6");
2859 }
2860
2861 static struct pernet_operations if6_proc_net_ops = {
2862        .init = if6_proc_net_init,
2863        .exit = if6_proc_net_exit,
2864 };
2865
2866 int __init if6_proc_init(void)
2867 {
2868         return register_pernet_subsys(&if6_proc_net_ops);
2869 }
2870
2871 void if6_proc_exit(void)
2872 {
2873         unregister_pernet_subsys(&if6_proc_net_ops);
2874 }
2875 #endif  /* CONFIG_PROC_FS */
2876
2877 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2878 /* Check if address is a home address configured on any interface. */
2879 int ipv6_chk_home_addr(struct in6_addr *addr)
2880 {
2881         int ret = 0;
2882         struct inet6_ifaddr * ifp;
2883         u8 hash = ipv6_addr_hash(addr);
2884         read_lock_bh(&addrconf_hash_lock);
2885         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2886                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2887                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2888                         ret = 1;
2889                         break;
2890                 }
2891         }
2892         read_unlock_bh(&addrconf_hash_lock);
2893         return ret;
2894 }
2895 #endif
2896
2897 /*
2898  *      Periodic address status verification
2899  */
2900
2901 static void addrconf_verify(unsigned long foo)
2902 {
2903         struct inet6_ifaddr *ifp;
2904         unsigned long now, next;
2905         int i;
2906
2907         spin_lock_bh(&addrconf_verify_lock);
2908         now = jiffies;
2909         next = now + ADDR_CHECK_FREQUENCY;
2910
2911         del_timer(&addr_chk_timer);
2912
2913         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2914
2915 restart:
2916                 read_lock(&addrconf_hash_lock);
2917                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2918                         unsigned long age;
2919 #ifdef CONFIG_IPV6_PRIVACY
2920                         unsigned long regen_advance;
2921 #endif
2922
2923                         if (ifp->flags & IFA_F_PERMANENT)
2924                                 continue;
2925
2926                         spin_lock(&ifp->lock);
2927                         age = (now - ifp->tstamp) / HZ;
2928
2929 #ifdef CONFIG_IPV6_PRIVACY
2930                         regen_advance = ifp->idev->cnf.regen_max_retry *
2931                                         ifp->idev->cnf.dad_transmits *
2932                                         ifp->idev->nd_parms->retrans_time / HZ;
2933 #endif
2934
2935                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2936                             age >= ifp->valid_lft) {
2937                                 spin_unlock(&ifp->lock);
2938                                 in6_ifa_hold(ifp);
2939                                 read_unlock(&addrconf_hash_lock);
2940                                 ipv6_del_addr(ifp);
2941                                 goto restart;
2942                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2943                                 spin_unlock(&ifp->lock);
2944                                 continue;
2945                         } else if (age >= ifp->prefered_lft) {
2946                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2947                                 int deprecate = 0;
2948
2949                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2950                                         deprecate = 1;
2951                                         ifp->flags |= IFA_F_DEPRECATED;
2952                                 }
2953
2954                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2955                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2956
2957                                 spin_unlock(&ifp->lock);
2958
2959                                 if (deprecate) {
2960                                         in6_ifa_hold(ifp);
2961                                         read_unlock(&addrconf_hash_lock);
2962
2963                                         ipv6_ifa_notify(0, ifp);
2964                                         in6_ifa_put(ifp);
2965                                         goto restart;
2966                                 }
2967 #ifdef CONFIG_IPV6_PRIVACY
2968                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2969                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2970                                 if (age >= ifp->prefered_lft - regen_advance) {
2971                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2972                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2973                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2974                                         if (!ifp->regen_count && ifpub) {
2975                                                 ifp->regen_count++;
2976                                                 in6_ifa_hold(ifp);
2977                                                 in6_ifa_hold(ifpub);
2978                                                 spin_unlock(&ifp->lock);
2979                                                 read_unlock(&addrconf_hash_lock);
2980                                                 spin_lock(&ifpub->lock);
2981                                                 ifpub->regen_count = 0;
2982                                                 spin_unlock(&ifpub->lock);
2983                                                 ipv6_create_tempaddr(ifpub, ifp);
2984                                                 in6_ifa_put(ifpub);
2985                                                 in6_ifa_put(ifp);
2986                                                 goto restart;
2987                                         }
2988                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2989                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2990                                 spin_unlock(&ifp->lock);
2991 #endif
2992                         } else {
2993                                 /* ifp->prefered_lft <= ifp->valid_lft */
2994                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2995                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2996                                 spin_unlock(&ifp->lock);
2997                         }
2998                 }
2999                 read_unlock(&addrconf_hash_lock);
3000         }
3001
3002         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3003         add_timer(&addr_chk_timer);
3004         spin_unlock_bh(&addrconf_verify_lock);
3005 }
3006
3007 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3008 {
3009         struct in6_addr *pfx = NULL;
3010
3011         if (addr)
3012                 pfx = nla_data(addr);
3013
3014         if (local) {
3015                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3016                         pfx = NULL;
3017                 else
3018                         pfx = nla_data(local);
3019         }
3020
3021         return pfx;
3022 }
3023
3024 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3025         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3026         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3027         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3028 };
3029
3030 static int
3031 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3032 {
3033         struct net *net = skb->sk->sk_net;
3034         struct ifaddrmsg *ifm;
3035         struct nlattr *tb[IFA_MAX+1];
3036         struct in6_addr *pfx;
3037         int err;
3038
3039         if (net != &init_net)
3040                 return -EINVAL;
3041
3042         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3043         if (err < 0)
3044                 return err;
3045
3046         ifm = nlmsg_data(nlh);
3047         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3048         if (pfx == NULL)
3049                 return -EINVAL;
3050
3051         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3052 }
3053
3054 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3055                              u32 prefered_lft, u32 valid_lft)
3056 {
3057         u32 flags = RTF_EXPIRES;
3058
3059         if (!valid_lft || (prefered_lft > valid_lft))
3060                 return -EINVAL;
3061
3062         if (valid_lft == INFINITY_LIFE_TIME) {
3063                 ifa_flags |= IFA_F_PERMANENT;
3064                 flags = 0;
3065         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3066                 valid_lft = 0x7FFFFFFF/HZ;
3067
3068         if (prefered_lft == 0)
3069                 ifa_flags |= IFA_F_DEPRECATED;
3070         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3071                  (prefered_lft != INFINITY_LIFE_TIME))
3072                 prefered_lft = 0x7FFFFFFF/HZ;
3073
3074         spin_lock_bh(&ifp->lock);
3075         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3076         ifp->tstamp = jiffies;
3077         ifp->valid_lft = valid_lft;
3078         ifp->prefered_lft = prefered_lft;
3079
3080         spin_unlock_bh(&ifp->lock);
3081         if (!(ifp->flags&IFA_F_TENTATIVE))
3082                 ipv6_ifa_notify(0, ifp);
3083
3084         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3085                               jiffies_to_clock_t(valid_lft * HZ), flags);
3086         addrconf_verify(0);
3087
3088         return 0;
3089 }
3090
3091 static int
3092 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3093 {
3094         struct net *net = skb->sk->sk_net;
3095         struct ifaddrmsg *ifm;
3096         struct nlattr *tb[IFA_MAX+1];
3097         struct in6_addr *pfx;
3098         struct inet6_ifaddr *ifa;
3099         struct net_device *dev;
3100         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3101         u8 ifa_flags;
3102         int err;
3103
3104         if (net != &init_net)
3105                 return -EINVAL;
3106
3107         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3108         if (err < 0)
3109                 return err;
3110
3111         ifm = nlmsg_data(nlh);
3112         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3113         if (pfx == NULL)
3114                 return -EINVAL;
3115
3116         if (tb[IFA_CACHEINFO]) {
3117                 struct ifa_cacheinfo *ci;
3118
3119                 ci = nla_data(tb[IFA_CACHEINFO]);
3120                 valid_lft = ci->ifa_valid;
3121                 preferred_lft = ci->ifa_prefered;
3122         } else {
3123                 preferred_lft = INFINITY_LIFE_TIME;
3124                 valid_lft = INFINITY_LIFE_TIME;
3125         }
3126
3127         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3128         if (dev == NULL)
3129                 return -ENODEV;
3130
3131         /* We ignore other flags so far. */
3132         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3133
3134         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3135         if (ifa == NULL) {
3136                 /*
3137                  * It would be best to check for !NLM_F_CREATE here but
3138                  * userspace alreay relies on not having to provide this.
3139                  */
3140                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3141                                       ifa_flags, preferred_lft, valid_lft);
3142         }
3143
3144         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3145             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3146                 err = -EEXIST;
3147         else
3148                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3149
3150         in6_ifa_put(ifa);
3151
3152         return err;
3153 }
3154
3155 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3156                           u8 scope, int ifindex)
3157 {
3158         struct ifaddrmsg *ifm;
3159
3160         ifm = nlmsg_data(nlh);
3161         ifm->ifa_family = AF_INET6;
3162         ifm->ifa_prefixlen = prefixlen;
3163         ifm->ifa_flags = flags;
3164         ifm->ifa_scope = scope;
3165         ifm->ifa_index = ifindex;
3166 }
3167
3168 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3169                          unsigned long tstamp, u32 preferred, u32 valid)
3170 {
3171         struct ifa_cacheinfo ci;
3172
3173         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3174                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3175         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3176                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3177         ci.ifa_prefered = preferred;
3178         ci.ifa_valid = valid;
3179
3180         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3181 }
3182
3183 static inline int rt_scope(int ifa_scope)
3184 {
3185         if (ifa_scope & IFA_HOST)
3186                 return RT_SCOPE_HOST;
3187         else if (ifa_scope & IFA_LINK)
3188                 return RT_SCOPE_LINK;
3189         else if (ifa_scope & IFA_SITE)
3190                 return RT_SCOPE_SITE;
3191         else
3192                 return RT_SCOPE_UNIVERSE;
3193 }
3194
3195 static inline int inet6_ifaddr_msgsize(void)
3196 {
3197         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3198                + nla_total_size(16) /* IFA_ADDRESS */
3199                + nla_total_size(sizeof(struct ifa_cacheinfo));
3200 }
3201
3202 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3203                              u32 pid, u32 seq, int event, unsigned int flags)
3204 {
3205         struct nlmsghdr  *nlh;
3206         u32 preferred, valid;
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, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3213                       ifa->idev->dev->ifindex);
3214
3215         if (!(ifa->flags&IFA_F_PERMANENT)) {
3216                 preferred = ifa->prefered_lft;
3217                 valid = ifa->valid_lft;
3218                 if (preferred != INFINITY_LIFE_TIME) {
3219                         long tval = (jiffies - ifa->tstamp)/HZ;
3220                         preferred -= tval;
3221                         if (valid != INFINITY_LIFE_TIME)
3222                                 valid -= tval;
3223                 }
3224         } else {
3225                 preferred = INFINITY_LIFE_TIME;
3226                 valid = INFINITY_LIFE_TIME;
3227         }
3228
3229         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3230             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3231                 nlmsg_cancel(skb, nlh);
3232                 return -EMSGSIZE;
3233         }
3234
3235         return nlmsg_end(skb, nlh);
3236 }
3237
3238 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3239                                 u32 pid, u32 seq, int event, u16 flags)
3240 {
3241         struct nlmsghdr  *nlh;
3242         u8 scope = RT_SCOPE_UNIVERSE;
3243         int ifindex = ifmca->idev->dev->ifindex;
3244
3245         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3246                 scope = RT_SCOPE_SITE;
3247
3248         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3249         if (nlh == NULL)
3250                 return -EMSGSIZE;
3251
3252         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3253         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3254             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3255                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3256                 nlmsg_cancel(skb, nlh);
3257                 return -EMSGSIZE;
3258         }
3259
3260         return nlmsg_end(skb, nlh);
3261 }
3262
3263 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3264                                 u32 pid, u32 seq, int event, unsigned int flags)
3265 {
3266         struct nlmsghdr  *nlh;
3267         u8 scope = RT_SCOPE_UNIVERSE;
3268         int ifindex = ifaca->aca_idev->dev->ifindex;
3269
3270         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3271                 scope = RT_SCOPE_SITE;
3272
3273         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3274         if (nlh == NULL)
3275                 return -EMSGSIZE;
3276
3277         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3278         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3279             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3280                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3281                 nlmsg_cancel(skb, nlh);
3282                 return -EMSGSIZE;
3283         }
3284
3285         return nlmsg_end(skb, nlh);
3286 }
3287
3288 enum addr_type_t
3289 {
3290         UNICAST_ADDR,
3291         MULTICAST_ADDR,
3292         ANYCAST_ADDR,
3293 };
3294
3295 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3296                            enum addr_type_t type)
3297 {
3298         int idx, ip_idx;
3299         int s_idx, s_ip_idx;
3300         int err = 1;
3301         struct net_device *dev;
3302         struct inet6_dev *idev = NULL;
3303         struct inet6_ifaddr *ifa;
3304         struct ifmcaddr6 *ifmca;
3305         struct ifacaddr6 *ifaca;
3306
3307         s_idx = cb->args[0];
3308         s_ip_idx = ip_idx = cb->args[1];
3309
3310         idx = 0;
3311         for_each_netdev(&init_net, dev) {
3312                 if (idx < s_idx)
3313                         goto cont;
3314                 if (idx > s_idx)
3315                         s_ip_idx = 0;
3316                 ip_idx = 0;
3317                 if ((idev = in6_dev_get(dev)) == NULL)
3318                         goto cont;
3319                 read_lock_bh(&idev->lock);
3320                 switch (type) {
3321                 case UNICAST_ADDR:
3322                         /* unicast address incl. temp addr */
3323                         for (ifa = idev->addr_list; ifa;
3324                              ifa = ifa->if_next, ip_idx++) {
3325                                 if (ip_idx < s_ip_idx)
3326                                         continue;
3327                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3328                                     NETLINK_CB(cb->skb).pid,
3329                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3330                                     NLM_F_MULTI)) <= 0)
3331                                         goto done;
3332                         }
3333                         break;
3334                 case MULTICAST_ADDR:
3335                         /* multicast address */
3336                         for (ifmca = idev->mc_list; ifmca;
3337                              ifmca = ifmca->next, ip_idx++) {
3338                                 if (ip_idx < s_ip_idx)
3339                                         continue;
3340                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3341                                     NETLINK_CB(cb->skb).pid,
3342                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3343                                     NLM_F_MULTI)) <= 0)
3344                                         goto done;
3345                         }
3346                         break;
3347                 case ANYCAST_ADDR:
3348                         /* anycast address */
3349                         for (ifaca = idev->ac_list; ifaca;
3350                              ifaca = ifaca->aca_next, ip_idx++) {
3351                                 if (ip_idx < s_ip_idx)
3352                                         continue;
3353                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3354                                     NETLINK_CB(cb->skb).pid,
3355                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3356                                     NLM_F_MULTI)) <= 0)
3357                                         goto done;
3358                         }
3359                         break;
3360                 default:
3361                         break;
3362                 }
3363                 read_unlock_bh(&idev->lock);
3364                 in6_dev_put(idev);
3365 cont:
3366                 idx++;
3367         }
3368 done:
3369         if (err <= 0) {
3370                 read_unlock_bh(&idev->lock);
3371                 in6_dev_put(idev);
3372         }
3373         cb->args[0] = idx;
3374         cb->args[1] = ip_idx;
3375         return skb->len;
3376 }
3377
3378 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3379 {
3380         struct net *net = skb->sk->sk_net;
3381         enum addr_type_t type = UNICAST_ADDR;
3382
3383         if (net != &init_net)
3384                 return 0;
3385
3386         return inet6_dump_addr(skb, cb, type);
3387 }
3388
3389 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3390 {
3391         struct net *net = skb->sk->sk_net;
3392         enum addr_type_t type = MULTICAST_ADDR;
3393
3394         if (net != &init_net)
3395                 return 0;
3396
3397         return inet6_dump_addr(skb, cb, type);
3398 }
3399
3400
3401 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3402 {
3403         struct net *net = skb->sk->sk_net;
3404         enum addr_type_t type = ANYCAST_ADDR;
3405
3406         if (net != &init_net)
3407                 return 0;
3408
3409         return inet6_dump_addr(skb, cb, type);
3410 }
3411
3412 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3413                              void *arg)
3414 {
3415         struct net *net = in_skb->sk->sk_net;
3416         struct ifaddrmsg *ifm;
3417         struct nlattr *tb[IFA_MAX+1];
3418         struct in6_addr *addr = NULL;
3419         struct net_device *dev = NULL;
3420         struct inet6_ifaddr *ifa;
3421         struct sk_buff *skb;
3422         int err;
3423
3424         if (net != &init_net)
3425                 return -EINVAL;
3426
3427         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3428         if (err < 0)
3429                 goto errout;
3430
3431         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3432         if (addr == NULL) {
3433                 err = -EINVAL;
3434                 goto errout;
3435         }
3436
3437         ifm = nlmsg_data(nlh);
3438         if (ifm->ifa_index)
3439                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3440
3441         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3442                 err = -EADDRNOTAVAIL;
3443                 goto errout;
3444         }
3445
3446         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3447                 err = -ENOBUFS;
3448                 goto errout_ifa;
3449         }
3450
3451         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3452                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3453         if (err < 0) {
3454                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3455                 WARN_ON(err == -EMSGSIZE);
3456                 kfree_skb(skb);
3457                 goto errout_ifa;
3458         }
3459         err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3460 errout_ifa:
3461         in6_ifa_put(ifa);
3462 errout:
3463         return err;
3464 }
3465
3466 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3467 {
3468         struct sk_buff *skb;
3469         int err = -ENOBUFS;
3470
3471         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3472         if (skb == NULL)
3473                 goto errout;
3474
3475         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3476         if (err < 0) {
3477                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3478                 WARN_ON(err == -EMSGSIZE);
3479                 kfree_skb(skb);
3480                 goto errout;
3481         }
3482         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3483 errout:
3484         if (err < 0)
3485                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3486 }
3487
3488 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3489                                 __s32 *array, int bytes)
3490 {
3491         BUG_ON(bytes < (DEVCONF_MAX * 4));
3492
3493         memset(array, 0, bytes);
3494         array[DEVCONF_FORWARDING] = cnf->forwarding;
3495         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3496         array[DEVCONF_MTU6] = cnf->mtu6;
3497         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3498         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3499         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3500         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3501         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3502         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3503         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3504         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3505 #ifdef CONFIG_IPV6_PRIVACY
3506         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3507         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3508         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3509         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3510         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3511 #endif
3512         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3513         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3514         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3515 #ifdef CONFIG_IPV6_ROUTER_PREF
3516         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3517         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3518 #ifdef CONFIG_IPV6_ROUTE_INFO
3519         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3520 #endif
3521 #endif
3522         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3523         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3524 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3525         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3526 #endif
3527 }
3528
3529 static inline size_t inet6_if_nlmsg_size(void)
3530 {
3531         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3532                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3533                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3534                + nla_total_size(4) /* IFLA_MTU */
3535                + nla_total_size(4) /* IFLA_LINK */
3536                + nla_total_size( /* IFLA_PROTINFO */
3537                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3538                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3539                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3540                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3541                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3542                  );
3543 }
3544
3545 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3546                                       int bytes)
3547 {
3548         int i;
3549         int pad = bytes - sizeof(u64) * items;
3550         BUG_ON(pad < 0);
3551
3552         /* Use put_unaligned() because stats may not be aligned for u64. */
3553         put_unaligned(items, &stats[0]);
3554         for (i = 1; i < items; i++)
3555                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3556
3557         memset(&stats[items], 0, pad);
3558 }
3559
3560 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3561                              int bytes)
3562 {
3563         switch(attrtype) {
3564         case IFLA_INET6_STATS:
3565                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3566                 break;
3567         case IFLA_INET6_ICMP6STATS:
3568                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3569                 break;
3570         }
3571 }
3572
3573 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3574                              u32 pid, u32 seq, int event, unsigned int flags)
3575 {
3576         struct net_device *dev = idev->dev;
3577         struct nlattr *nla;
3578         struct ifinfomsg *hdr;
3579         struct nlmsghdr *nlh;
3580         void *protoinfo;
3581         struct ifla_cacheinfo ci;
3582
3583         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3584         if (nlh == NULL)
3585                 return -EMSGSIZE;
3586
3587         hdr = nlmsg_data(nlh);
3588         hdr->ifi_family = AF_INET6;
3589         hdr->__ifi_pad = 0;
3590         hdr->ifi_type = dev->type;
3591         hdr->ifi_index = dev->ifindex;
3592         hdr->ifi_flags = dev_get_flags(dev);
3593         hdr->ifi_change = 0;
3594
3595         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3596
3597         if (dev->addr_len)
3598                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3599
3600         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3601         if (dev->ifindex != dev->iflink)
3602                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3603
3604         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3605         if (protoinfo == NULL)
3606                 goto nla_put_failure;
3607
3608         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3609
3610         ci.max_reasm_len = IPV6_MAXPLEN;
3611         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3612                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3613         ci.reachable_time = idev->nd_parms->reachable_time;
3614         ci.retrans_time = idev->nd_parms->retrans_time;
3615         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3616
3617         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3618         if (nla == NULL)
3619                 goto nla_put_failure;
3620         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3621
3622         /* XXX - MC not implemented */
3623
3624         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3625         if (nla == NULL)
3626                 goto nla_put_failure;
3627         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3628
3629         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3630         if (nla == NULL)
3631                 goto nla_put_failure;
3632         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3633
3634         nla_nest_end(skb, protoinfo);
3635         return nlmsg_end(skb, nlh);
3636
3637 nla_put_failure:
3638         nlmsg_cancel(skb, nlh);
3639         return -EMSGSIZE;
3640 }
3641
3642 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3643 {
3644         struct net *net = skb->sk->sk_net;
3645         int idx, err;
3646         int s_idx = cb->args[0];
3647         struct net_device *dev;
3648         struct inet6_dev *idev;
3649
3650         if (net != &init_net)
3651                 return 0;
3652
3653         read_lock(&dev_base_lock);
3654         idx = 0;
3655         for_each_netdev(&init_net, dev) {
3656                 if (idx < s_idx)
3657                         goto cont;
3658                 if ((idev = in6_dev_get(dev)) == NULL)
3659                         goto cont;
3660                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3661                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3662                 in6_dev_put(idev);
3663                 if (err <= 0)
3664                         break;
3665 cont:
3666                 idx++;
3667         }
3668         read_unlock(&dev_base_lock);
3669         cb->args[0] = idx;
3670
3671         return skb->len;
3672 }
3673
3674 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3675 {
3676         struct sk_buff *skb;
3677         int err = -ENOBUFS;
3678
3679         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3680         if (skb == NULL)
3681                 goto errout;
3682
3683         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3684         if (err < 0) {
3685                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3686                 WARN_ON(err == -EMSGSIZE);
3687                 kfree_skb(skb);
3688                 goto errout;
3689         }
3690         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3691 errout:
3692         if (err < 0)
3693                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3694 }
3695
3696 static inline size_t inet6_prefix_nlmsg_size(void)
3697 {
3698         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3699                + nla_total_size(sizeof(struct in6_addr))
3700                + nla_total_size(sizeof(struct prefix_cacheinfo));
3701 }
3702
3703 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3704                              struct prefix_info *pinfo, u32 pid, u32 seq,
3705                              int event, unsigned int flags)
3706 {
3707         struct prefixmsg *pmsg;
3708         struct nlmsghdr *nlh;
3709         struct prefix_cacheinfo ci;
3710
3711         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3712         if (nlh == NULL)
3713                 return -EMSGSIZE;
3714
3715         pmsg = nlmsg_data(nlh);
3716         pmsg->prefix_family = AF_INET6;
3717         pmsg->prefix_pad1 = 0;
3718         pmsg->prefix_pad2 = 0;
3719         pmsg->prefix_ifindex = idev->dev->ifindex;
3720         pmsg->prefix_len = pinfo->prefix_len;
3721         pmsg->prefix_type = pinfo->type;
3722         pmsg->prefix_pad3 = 0;
3723         pmsg->prefix_flags = 0;
3724         if (pinfo->onlink)
3725                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3726         if (pinfo->autoconf)
3727                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3728
3729         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3730
3731         ci.preferred_time = ntohl(pinfo->prefered);
3732         ci.valid_time = ntohl(pinfo->valid);
3733         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3734
3735         return nlmsg_end(skb, nlh);
3736
3737 nla_put_failure:
3738         nlmsg_cancel(skb, nlh);
3739         return -EMSGSIZE;
3740 }
3741
3742 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3743                          struct prefix_info *pinfo)
3744 {
3745         struct sk_buff *skb;
3746         int err = -ENOBUFS;
3747
3748         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3749         if (skb == NULL)
3750                 goto errout;
3751
3752         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3753         if (err < 0) {
3754                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3755                 WARN_ON(err == -EMSGSIZE);
3756                 kfree_skb(skb);
3757                 goto errout;
3758         }
3759         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3760 errout:
3761         if (err < 0)
3762                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3763 }
3764
3765 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3766 {
3767         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3768
3769         switch (event) {
3770         case RTM_NEWADDR:
3771                 /*
3772                  * If the address was optimistic
3773                  * we inserted the route at the start of
3774                  * our DAD process, so we don't need
3775                  * to do it again
3776                  */
3777                 if (!(ifp->rt->rt6i_node))
3778                         ip6_ins_rt(ifp->rt);
3779                 if (ifp->idev->cnf.forwarding)
3780                         addrconf_join_anycast(ifp);
3781                 break;
3782         case RTM_DELADDR:
3783                 if (ifp->idev->cnf.forwarding)
3784                         addrconf_leave_anycast(ifp);
3785                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3786                 dst_hold(&ifp->rt->u.dst);
3787                 if (ip6_del_rt(ifp->rt))
3788                         dst_free(&ifp->rt->u.dst);
3789                 break;
3790         }
3791 }
3792
3793 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3794 {
3795         rcu_read_lock_bh();
3796         if (likely(ifp->idev->dead == 0))
3797                 __ipv6_ifa_notify(event, ifp);
3798         rcu_read_unlock_bh();
3799 }
3800
3801 #ifdef CONFIG_SYSCTL
3802
3803 static
3804 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3805                            void __user *buffer, size_t *lenp, loff_t *ppos)
3806 {
3807         int *valp = ctl->data;
3808         int val = *valp;
3809         int ret;
3810
3811         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3812
3813         if (write)
3814                 addrconf_fixup_forwarding(ctl, valp, val);
3815         return ret;
3816 }
3817
3818 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3819                                             int __user *name, int nlen,
3820                                             void __user *oldval,
3821                                             size_t __user *oldlenp,
3822                                             void __user *newval, size_t newlen)
3823 {
3824         int *valp = table->data;
3825         int val = *valp;
3826         int new;
3827
3828         if (!newval || !newlen)
3829                 return 0;
3830         if (newlen != sizeof(int))
3831                 return -EINVAL;
3832         if (get_user(new, (int __user *)newval))
3833                 return -EFAULT;
3834         if (new == *valp)
3835                 return 0;
3836         if (oldval && oldlenp) {
3837                 size_t len;
3838                 if (get_user(len, oldlenp))
3839                         return -EFAULT;
3840                 if (len) {
3841                         if (len > table->maxlen)
3842                                 len = table->maxlen;
3843                         if (copy_to_user(oldval, valp, len))
3844                                 return -EFAULT;
3845                         if (put_user(len, oldlenp))
3846                                 return -EFAULT;
3847                 }
3848         }
3849
3850         *valp = new;
3851         addrconf_fixup_forwarding(table, valp, val);
3852         return 1;
3853 }
3854
3855 static struct addrconf_sysctl_table
3856 {
3857         struct ctl_table_header *sysctl_header;
3858         ctl_table addrconf_vars[__NET_IPV6_MAX];
3859         char *dev_name;
3860 } addrconf_sysctl __read_mostly = {
3861         .sysctl_header = NULL,
3862         .addrconf_vars = {
3863                 {
3864                         .ctl_name       =       NET_IPV6_FORWARDING,
3865                         .procname       =       "forwarding",
3866                         .data           =       &ipv6_devconf.forwarding,
3867                         .maxlen         =       sizeof(int),
3868                         .mode           =       0644,
3869                         .proc_handler   =       &addrconf_sysctl_forward,
3870                         .strategy       =       &addrconf_sysctl_forward_strategy,
3871                 },
3872                 {
3873                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3874                         .procname       =       "hop_limit",
3875                         .data           =       &ipv6_devconf.hop_limit,
3876                         .maxlen         =       sizeof(int),
3877                         .mode           =       0644,
3878                         .proc_handler   =       proc_dointvec,
3879                 },
3880                 {
3881                         .ctl_name       =       NET_IPV6_MTU,
3882                         .procname       =       "mtu",
3883                         .data           =       &ipv6_devconf.mtu6,
3884                         .maxlen         =       sizeof(int),
3885                         .mode           =       0644,
3886                         .proc_handler   =       &proc_dointvec,
3887                 },
3888                 {
3889                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3890                         .procname       =       "accept_ra",
3891                         .data           =       &ipv6_devconf.accept_ra,
3892                         .maxlen         =       sizeof(int),
3893                         .mode           =       0644,
3894                         .proc_handler   =       &proc_dointvec,
3895                 },
3896                 {
3897                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3898                         .procname       =       "accept_redirects",
3899                         .data           =       &ipv6_devconf.accept_redirects,
3900                         .maxlen         =       sizeof(int),
3901                         .mode           =       0644,
3902                         .proc_handler   =       &proc_dointvec,
3903                 },
3904                 {
3905                         .ctl_name       =       NET_IPV6_AUTOCONF,
3906                         .procname       =       "autoconf",
3907                         .data           =       &ipv6_devconf.autoconf,
3908                         .maxlen         =       sizeof(int),
3909                         .mode           =       0644,
3910                         .proc_handler   =       &proc_dointvec,
3911                 },
3912                 {
3913                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3914                         .procname       =       "dad_transmits",
3915                         .data           =       &ipv6_devconf.dad_transmits,
3916                         .maxlen         =       sizeof(int),
3917                         .mode           =       0644,
3918                         .proc_handler   =       &proc_dointvec,
3919                 },
3920                 {
3921                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3922                         .procname       =       "router_solicitations",
3923                         .data           =       &ipv6_devconf.rtr_solicits,
3924                         .maxlen         =       sizeof(int),
3925                         .mode           =       0644,
3926                         .proc_handler   =       &proc_dointvec,
3927                 },
3928                 {
3929                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3930                         .procname       =       "router_solicitation_interval",
3931                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3932                         .maxlen         =       sizeof(int),
3933                         .mode           =       0644,
3934                         .proc_handler   =       &proc_dointvec_jiffies,
3935                         .strategy       =       &sysctl_jiffies,
3936                 },
3937                 {
3938                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3939                         .procname       =       "router_solicitation_delay",
3940                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3941                         .maxlen         =       sizeof(int),
3942                         .mode           =       0644,
3943                         .proc_handler   =       &proc_dointvec_jiffies,
3944                         .strategy       =       &sysctl_jiffies,
3945                 },
3946                 {
3947                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3948                         .procname       =       "force_mld_version",
3949                         .data           =       &ipv6_devconf.force_mld_version,
3950                         .maxlen         =       sizeof(int),
3951                         .mode           =       0644,
3952                         .proc_handler   =       &proc_dointvec,
3953                 },
3954 #ifdef CONFIG_IPV6_PRIVACY
3955                 {
3956                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3957                         .procname       =       "use_tempaddr",
3958                         .data           =       &ipv6_devconf.use_tempaddr,
3959                         .maxlen         =       sizeof(int),
3960                         .mode           =       0644,
3961                         .proc_handler   =       &proc_dointvec,
3962                 },
3963                 {
3964                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3965                         .procname       =       "temp_valid_lft",
3966                         .data           =       &ipv6_devconf.temp_valid_lft,
3967                         .maxlen         =       sizeof(int),
3968                         .mode           =       0644,
3969                         .proc_handler   =       &proc_dointvec,
3970                 },
3971                 {
3972                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3973                         .procname       =       "temp_prefered_lft",
3974                         .data           =       &ipv6_devconf.temp_prefered_lft,
3975                         .maxlen         =       sizeof(int),
3976                         .mode           =       0644,
3977                         .proc_handler   =       &proc_dointvec,
3978                 },
3979                 {
3980                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3981                         .procname       =       "regen_max_retry",
3982                         .data           =       &ipv6_devconf.regen_max_retry,
3983                         .maxlen         =       sizeof(int),
3984                         .mode           =       0644,
3985                         .proc_handler   =       &proc_dointvec,
3986                 },
3987                 {
3988                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3989                         .procname       =       "max_desync_factor",
3990                         .data           =       &ipv6_devconf.max_desync_factor,
3991                         .maxlen         =       sizeof(int),
3992                         .mode           =       0644,
3993                         .proc_handler   =       &proc_dointvec,
3994                 },
3995 #endif
3996                 {
3997                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3998                         .procname       =       "max_addresses",
3999                         .data           =       &ipv6_devconf.max_addresses,
4000                         .maxlen         =       sizeof(int),
4001                         .mode           =       0644,
4002                         .proc_handler   =       &proc_dointvec,
4003                 },
4004                 {
4005                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4006                         .procname       =       "accept_ra_defrtr",
4007                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4008                         .maxlen         =       sizeof(int),
4009                         .mode           =       0644,
4010                         .proc_handler   =       &proc_dointvec,
4011                 },
4012                 {
4013                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4014                         .procname       =       "accept_ra_pinfo",
4015                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4016                         .maxlen         =       sizeof(int),
4017                         .mode           =       0644,
4018                         .proc_handler   =       &proc_dointvec,
4019                 },
4020 #ifdef CONFIG_IPV6_ROUTER_PREF
4021                 {
4022                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4023                         .procname       =       "accept_ra_rtr_pref",
4024                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4025                         .maxlen         =       sizeof(int),
4026                         .mode           =       0644,
4027                         .proc_handler   =       &proc_dointvec,
4028                 },
4029                 {
4030                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4031                         .procname       =       "router_probe_interval",
4032                         .data           =       &ipv6_devconf.rtr_probe_interval,
4033                         .maxlen         =       sizeof(int),
4034                         .mode           =       0644,
4035                         .proc_handler   =       &proc_dointvec_jiffies,
4036                         .strategy       =       &sysctl_jiffies,
4037                 },
4038 #ifdef CONFIG_IPV6_ROUTE_INFO
4039                 {
4040                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4041                         .procname       =       "accept_ra_rt_info_max_plen",
4042                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4043                         .maxlen         =       sizeof(int),
4044                         .mode           =       0644,
4045                         .proc_handler   =       &proc_dointvec,
4046                 },
4047 #endif
4048 #endif
4049                 {
4050                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4051                         .procname       =       "proxy_ndp",
4052                         .data           =       &ipv6_devconf.proxy_ndp,
4053                         .maxlen         =       sizeof(int),
4054                         .mode           =       0644,
4055                         .proc_handler   =       &proc_dointvec,
4056                 },
4057                 {
4058                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4059                         .procname       =       "accept_source_route",
4060                         .data           =       &ipv6_devconf.accept_source_route,
4061                         .maxlen         =       sizeof(int),
4062                         .mode           =       0644,
4063                         .proc_handler   =       &proc_dointvec,
4064                 },
4065 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4066                 {
4067                         .ctl_name       =       CTL_UNNUMBERED,
4068                         .procname       =       "optimistic_dad",
4069                         .data           =       &ipv6_devconf.optimistic_dad,
4070                         .maxlen         =       sizeof(int),
4071                         .mode           =       0644,
4072                         .proc_handler   =       &proc_dointvec,
4073
4074                 },
4075 #endif
4076                 {
4077                         .ctl_name       =       0,      /* sentinel */
4078                 }
4079         },
4080 };
4081
4082 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4083                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4084 {
4085         int i;
4086         struct addrconf_sysctl_table *t;
4087
4088 #define ADDRCONF_CTL_PATH_DEV   3
4089
4090         struct ctl_path addrconf_ctl_path[] = {
4091                 { .procname = "net", .ctl_name = CTL_NET, },
4092                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4093                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4094                 { /* to be set */ },
4095                 { },
4096         };
4097
4098
4099         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4100         if (t == NULL)
4101                 goto out;
4102
4103         for (i=0; t->addrconf_vars[i].data; i++) {
4104                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4105                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4106                 t->addrconf_vars[i].extra2 = net;
4107         }
4108
4109         /*
4110          * Make a copy of dev_name, because '.procname' is regarded as const
4111          * by sysctl and we wouldn't want anyone to change it under our feet
4112          * (see SIOCSIFNAME).
4113          */
4114         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4115         if (!t->dev_name)
4116                 goto free;
4117
4118         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4119         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4120
4121         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4122                         t->addrconf_vars);
4123         if (t->sysctl_header == NULL)
4124                 goto free_procname;
4125
4126         p->sysctl = t;
4127         return 0;
4128
4129 free_procname:
4130         kfree(t->dev_name);
4131 free:
4132         kfree(t);
4133 out:
4134         return -ENOBUFS;
4135 }
4136
4137 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4138 {
4139         struct addrconf_sysctl_table *t;
4140
4141         if (p->sysctl == NULL)
4142                 return;
4143
4144         t = p->sysctl;
4145         p->sysctl = NULL;
4146         unregister_sysctl_table(t->sysctl_header);
4147         kfree(t->dev_name);
4148         kfree(t);
4149 }
4150
4151 static void addrconf_sysctl_register(struct inet6_dev *idev)
4152 {
4153         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4154                               NET_IPV6_NEIGH, "ipv6",
4155                               &ndisc_ifinfo_sysctl_change,
4156                               NULL);
4157         __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4158                         idev->dev->ifindex, idev, &idev->cnf);
4159 }
4160
4161 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4162 {
4163         __addrconf_sysctl_unregister(&idev->cnf);
4164         neigh_sysctl_unregister(idev->nd_parms);
4165 }
4166
4167
4168 #endif
4169
4170 static int addrconf_init_net(struct net *net)
4171 {
4172         int err;
4173         struct ipv6_devconf *all, *dflt;
4174
4175         err = -ENOMEM;
4176         all = &ipv6_devconf;
4177         dflt = &ipv6_devconf_dflt;
4178
4179         if (net != &init_net) {
4180                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4181                 if (all == NULL)
4182                         goto err_alloc_all;
4183
4184                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4185                 if (dflt == NULL)
4186                         goto err_alloc_dflt;
4187         }
4188
4189         net->ipv6.devconf_all = all;
4190         net->ipv6.devconf_dflt = dflt;
4191
4192 #ifdef CONFIG_SYSCTL
4193         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4194                         NULL, all);
4195         if (err < 0)
4196                 goto err_reg_all;
4197
4198         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4199                         NULL, dflt);
4200         if (err < 0)
4201                 goto err_reg_dflt;
4202 #endif
4203         return 0;
4204
4205 #ifdef CONFIG_SYSCTL
4206 err_reg_dflt:
4207         __addrconf_sysctl_unregister(all);
4208 err_reg_all:
4209         kfree(dflt);
4210 #endif
4211 err_alloc_dflt:
4212         kfree(all);
4213 err_alloc_all:
4214         return err;
4215 }
4216
4217 static void addrconf_exit_net(struct net *net)
4218 {
4219 #ifdef CONFIG_SYSCTL
4220         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4221         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4222 #endif
4223         if (net != &init_net) {
4224                 kfree(net->ipv6.devconf_dflt);
4225                 kfree(net->ipv6.devconf_all);
4226         }
4227 }
4228
4229 static struct pernet_operations addrconf_ops = {
4230         .init = addrconf_init_net,
4231         .exit = addrconf_exit_net,
4232 };
4233
4234 /*
4235  *      Device notifier
4236  */
4237
4238 int register_inet6addr_notifier(struct notifier_block *nb)
4239 {
4240         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4241 }
4242
4243 EXPORT_SYMBOL(register_inet6addr_notifier);
4244
4245 int unregister_inet6addr_notifier(struct notifier_block *nb)
4246 {
4247         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4248 }
4249
4250 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4251
4252 /*
4253  *      Init / cleanup code
4254  */
4255
4256 int __init addrconf_init(void)
4257 {
4258         int err;
4259
4260         if ((err = ipv6_addr_label_init()) < 0) {
4261                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4262                         err);
4263                 return err;
4264         }
4265
4266         register_pernet_subsys(&addrconf_ops);
4267
4268         /* The addrconf netdev notifier requires that loopback_dev
4269          * has it's ipv6 private information allocated and setup
4270          * before it can bring up and give link-local addresses
4271          * to other devices which are up.
4272          *
4273          * Unfortunately, loopback_dev is not necessarily the first
4274          * entry in the global dev_base list of net devices.  In fact,
4275          * it is likely to be the very last entry on that list.
4276          * So this causes the notifier registry below to try and
4277          * give link-local addresses to all devices besides loopback_dev
4278          * first, then loopback_dev, which cases all the non-loopback_dev
4279          * devices to fail to get a link-local address.
4280          *
4281          * So, as a temporary fix, allocate the ipv6 structure for
4282          * loopback_dev first by hand.
4283          * Longer term, all of the dependencies ipv6 has upon the loopback
4284          * device and it being up should be removed.
4285          */
4286         rtnl_lock();
4287         if (!ipv6_add_dev(init_net.loopback_dev))
4288                 err = -ENOMEM;
4289         rtnl_unlock();
4290         if (err)
4291                 goto errlo;
4292
4293         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4294         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4295 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4296         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4297         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4298         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4299         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4300 #endif
4301
4302         register_netdevice_notifier(&ipv6_dev_notf);
4303
4304         addrconf_verify(0);
4305
4306         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4307         if (err < 0)
4308                 goto errout;
4309
4310         /* Only the first call to __rtnl_register can fail */
4311         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4312         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4313         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4314         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4315         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4316
4317         ipv6_addr_label_rtnl_register();
4318
4319         return 0;
4320 errout:
4321         unregister_netdevice_notifier(&ipv6_dev_notf);
4322 errlo:
4323         unregister_pernet_subsys(&addrconf_ops);
4324
4325         return err;
4326 }
4327
4328 void addrconf_cleanup(void)
4329 {
4330         struct net_device *dev;
4331         struct inet6_ifaddr *ifa;
4332         int i;
4333
4334         unregister_netdevice_notifier(&ipv6_dev_notf);
4335
4336         unregister_pernet_subsys(&addrconf_ops);
4337
4338         rtnl_lock();
4339
4340         /*
4341          *      clean dev list.
4342          */
4343
4344         for_each_netdev(&init_net, dev) {
4345                 if (__in6_dev_get(dev) == NULL)
4346                         continue;
4347                 addrconf_ifdown(dev, 1);
4348         }
4349         addrconf_ifdown(init_net.loopback_dev, 2);
4350
4351         /*
4352          *      Check hash table.
4353          */
4354
4355         write_lock_bh(&addrconf_hash_lock);
4356         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4357                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4358                         struct inet6_ifaddr *bifa;
4359
4360                         bifa = ifa;
4361                         ifa = ifa->lst_next;
4362                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4363                         /* Do not free it; something is wrong.
4364                            Now we can investigate it with debugger.
4365                          */
4366                 }
4367         }
4368         write_unlock_bh(&addrconf_hash_lock);
4369
4370         del_timer(&addr_chk_timer);
4371
4372         rtnl_unlock();
4373 }