SAFE public projects git trees. - safe/jmp/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 in6_addr *addr, struct net_device *dev, int strict)
1210 {
1211         struct inet6_ifaddr * ifp;
1212         u8 hash = ipv6_addr_hash(addr);
1213
1214         read_lock_bh(&addrconf_hash_lock);
1215         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1216                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1217                     !(ifp->flags&IFA_F_TENTATIVE)) {
1218                         if (dev == NULL || ifp->idev->dev == dev ||
1219                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1220                                 break;
1221                 }
1222         }
1223         read_unlock_bh(&addrconf_hash_lock);
1224         return ifp != NULL;
1225 }
1226
1227 EXPORT_SYMBOL(ipv6_chk_addr);
1228
1229 static
1230 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1231 {
1232         struct inet6_ifaddr * ifp;
1233         u8 hash = ipv6_addr_hash(addr);
1234
1235         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1236                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1237                         if (dev == NULL || ifp->idev->dev == dev)
1238                                 break;
1239                 }
1240         }
1241         return ifp != NULL;
1242 }
1243
1244 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1245 {
1246         struct inet6_ifaddr * ifp;
1247         u8 hash = ipv6_addr_hash(addr);
1248
1249         read_lock_bh(&addrconf_hash_lock);
1250         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1251                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1252                         if (dev == NULL || ifp->idev->dev == dev ||
1253                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1254                                 in6_ifa_hold(ifp);
1255                                 break;
1256                         }
1257                 }
1258         }
1259         read_unlock_bh(&addrconf_hash_lock);
1260
1261         return ifp;
1262 }
1263
1264 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1265 {
1266         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1267         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1268         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1269         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1270         int sk_ipv6only = ipv6_only_sock(sk);
1271         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1272         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1273         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1274
1275         if (!sk2_rcv_saddr && !sk_ipv6only)
1276                 return 1;
1277
1278         if (addr_type2 == IPV6_ADDR_ANY &&
1279             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1280                 return 1;
1281
1282         if (addr_type == IPV6_ADDR_ANY &&
1283             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1284                 return 1;
1285
1286         if (sk2_rcv_saddr6 &&
1287             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1288                 return 1;
1289
1290         if (addr_type == IPV6_ADDR_MAPPED &&
1291             !sk2_ipv6only &&
1292             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1293                 return 1;
1294
1295         return 0;
1296 }
1297
1298 /* Gets referenced address, destroys ifaddr */
1299
1300 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1301 {
1302         if (ifp->flags&IFA_F_PERMANENT) {
1303                 spin_lock_bh(&ifp->lock);
1304                 addrconf_del_timer(ifp);
1305                 ifp->flags |= IFA_F_TENTATIVE;
1306                 spin_unlock_bh(&ifp->lock);
1307                 in6_ifa_put(ifp);
1308 #ifdef CONFIG_IPV6_PRIVACY
1309         } else if (ifp->flags&IFA_F_TEMPORARY) {
1310                 struct inet6_ifaddr *ifpub;
1311                 spin_lock_bh(&ifp->lock);
1312                 ifpub = ifp->ifpub;
1313                 if (ifpub) {
1314                         in6_ifa_hold(ifpub);
1315                         spin_unlock_bh(&ifp->lock);
1316                         ipv6_create_tempaddr(ifpub, ifp);
1317                         in6_ifa_put(ifpub);
1318                 } else {
1319                         spin_unlock_bh(&ifp->lock);
1320                 }
1321                 ipv6_del_addr(ifp);
1322 #endif
1323         } else
1324                 ipv6_del_addr(ifp);
1325 }
1326
1327 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1328 {
1329         if (net_ratelimit())
1330                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1331         addrconf_dad_stop(ifp);
1332 }
1333
1334 /* Join to solicited addr multicast group. */
1335
1336 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1337 {
1338         struct in6_addr maddr;
1339
1340         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1341                 return;
1342
1343         addrconf_addr_solict_mult(addr, &maddr);
1344         ipv6_dev_mc_inc(dev, &maddr);
1345 }
1346
1347 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1348 {
1349         struct in6_addr maddr;
1350
1351         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1352                 return;
1353
1354         addrconf_addr_solict_mult(addr, &maddr);
1355         __ipv6_dev_mc_dec(idev, &maddr);
1356 }
1357
1358 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1359 {
1360         struct in6_addr addr;
1361         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1362         if (ipv6_addr_any(&addr))
1363                 return;
1364         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1365 }
1366
1367 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1368 {
1369         struct in6_addr addr;
1370         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1371         if (ipv6_addr_any(&addr))
1372                 return;
1373         __ipv6_dev_ac_dec(ifp->idev, &addr);
1374 }
1375
1376 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1377 {
1378         if (dev->addr_len != ETH_ALEN)
1379                 return -1;
1380         memcpy(eui, dev->dev_addr, 3);
1381         memcpy(eui + 5, dev->dev_addr + 3, 3);
1382
1383         /*
1384          * The zSeries OSA network cards can be shared among various
1385          * OS instances, but the OSA cards have only one MAC address.
1386          * This leads to duplicate address conflicts in conjunction
1387          * with IPv6 if more than one instance uses the same card.
1388          *
1389          * The driver for these cards can deliver a unique 16-bit
1390          * identifier for each instance sharing the same card.  It is
1391          * placed instead of 0xFFFE in the interface identifier.  The
1392          * "u" bit of the interface identifier is not inverted in this
1393          * case.  Hence the resulting interface identifier has local
1394          * scope according to RFC2373.
1395          */
1396         if (dev->dev_id) {
1397                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1398                 eui[4] = dev->dev_id & 0xFF;
1399         } else {
1400                 eui[3] = 0xFF;
1401                 eui[4] = 0xFE;
1402                 eui[0] ^= 2;
1403         }
1404         return 0;
1405 }
1406
1407 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1408 {
1409         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1410         if (dev->addr_len != ARCNET_ALEN)
1411                 return -1;
1412         memset(eui, 0, 7);
1413         eui[7] = *(u8*)dev->dev_addr;
1414         return 0;
1415 }
1416
1417 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1418 {
1419         if (dev->addr_len != INFINIBAND_ALEN)
1420                 return -1;
1421         memcpy(eui, dev->dev_addr + 12, 8);
1422         eui[0] |= 2;
1423         return 0;
1424 }
1425
1426 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1427 {
1428         switch (dev->type) {
1429         case ARPHRD_ETHER:
1430         case ARPHRD_FDDI:
1431         case ARPHRD_IEEE802_TR:
1432                 return addrconf_ifid_eui48(eui, dev);
1433         case ARPHRD_ARCNET:
1434                 return addrconf_ifid_arcnet(eui, dev);
1435         case ARPHRD_INFINIBAND:
1436                 return addrconf_ifid_infiniband(eui, dev);
1437         case ARPHRD_SIT:
1438                 if (dev->priv_flags & IFF_ISATAP)
1439                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1440         }
1441         return -1;
1442 }
1443
1444 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1445 {
1446         int err = -1;
1447         struct inet6_ifaddr *ifp;
1448
1449         read_lock_bh(&idev->lock);
1450         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1451                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1452                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1453                         err = 0;
1454                         break;
1455                 }
1456         }
1457         read_unlock_bh(&idev->lock);
1458         return err;
1459 }
1460
1461 #ifdef CONFIG_IPV6_PRIVACY
1462 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1463 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1464 {
1465 regen:
1466         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1467         idev->rndid[0] &= ~0x02;
1468
1469         /*
1470          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1471          * check if generated address is not inappropriate
1472          *
1473          *  - Reserved subnet anycast (RFC 2526)
1474          *      11111101 11....11 1xxxxxxx
1475          *  - ISATAP (RFC4214) 6.1
1476          *      00-00-5E-FE-xx-xx-xx-xx
1477          *  - value 0
1478          *  - XXX: already assigned to an address on the device
1479          */
1480         if (idev->rndid[0] == 0xfd &&
1481             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1482             (idev->rndid[7]&0x80))
1483                 goto regen;
1484         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1485                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1486                         goto regen;
1487                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1488                         goto regen;
1489         }
1490
1491         return 0;
1492 }
1493
1494 static void ipv6_regen_rndid(unsigned long data)
1495 {
1496         struct inet6_dev *idev = (struct inet6_dev *) data;
1497         unsigned long expires;
1498
1499         rcu_read_lock_bh();
1500         write_lock_bh(&idev->lock);
1501
1502         if (idev->dead)
1503                 goto out;
1504
1505         if (__ipv6_regen_rndid(idev) < 0)
1506                 goto out;
1507
1508         expires = jiffies +
1509                 idev->cnf.temp_prefered_lft * HZ -
1510                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1511         if (time_before(expires, jiffies)) {
1512                 printk(KERN_WARNING
1513                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1514                         idev->dev->name);
1515                 goto out;
1516         }
1517
1518         if (!mod_timer(&idev->regen_timer, expires))
1519                 in6_dev_hold(idev);
1520
1521 out:
1522         write_unlock_bh(&idev->lock);
1523         rcu_read_unlock_bh();
1524         in6_dev_put(idev);
1525 }
1526
1527 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1528         int ret = 0;
1529
1530         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1531                 ret = __ipv6_regen_rndid(idev);
1532         return ret;
1533 }
1534 #endif
1535
1536 /*
1537  *      Add prefix route.
1538  */
1539
1540 static void
1541 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1542                       unsigned long expires, u32 flags)
1543 {
1544         struct fib6_config cfg = {
1545                 .fc_table = RT6_TABLE_PREFIX,
1546                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1547                 .fc_ifindex = dev->ifindex,
1548                 .fc_expires = expires,
1549                 .fc_dst_len = plen,
1550                 .fc_flags = RTF_UP | flags,
1551         };
1552
1553         ipv6_addr_copy(&cfg.fc_dst, pfx);
1554
1555         /* Prevent useless cloning on PtP SIT.
1556            This thing is done here expecting that the whole
1557            class of non-broadcast devices need not cloning.
1558          */
1559 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1560         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1561                 cfg.fc_flags |= RTF_NONEXTHOP;
1562 #endif
1563
1564         ip6_route_add(&cfg);
1565 }
1566
1567 /* Create "default" multicast route to the interface */
1568
1569 static void addrconf_add_mroute(struct net_device *dev)
1570 {
1571         struct fib6_config cfg = {
1572                 .fc_table = RT6_TABLE_LOCAL,
1573                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1574                 .fc_ifindex = dev->ifindex,
1575                 .fc_dst_len = 8,
1576                 .fc_flags = RTF_UP,
1577         };
1578
1579         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1580
1581         ip6_route_add(&cfg);
1582 }
1583
1584 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1585 static void sit_route_add(struct net_device *dev)
1586 {
1587         struct fib6_config cfg = {
1588                 .fc_table = RT6_TABLE_MAIN,
1589                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1590                 .fc_ifindex = dev->ifindex,
1591                 .fc_dst_len = 96,
1592                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1593         };
1594
1595         /* prefix length - 96 bits "::d.d.d.d" */
1596         ip6_route_add(&cfg);
1597 }
1598 #endif
1599
1600 static void addrconf_add_lroute(struct net_device *dev)
1601 {
1602         struct in6_addr addr;
1603
1604         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1605         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1606 }
1607
1608 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1609 {
1610         struct inet6_dev *idev;
1611
1612         ASSERT_RTNL();
1613
1614         if ((idev = ipv6_find_idev(dev)) == NULL)
1615                 return NULL;
1616
1617         /* Add default multicast route */
1618         addrconf_add_mroute(dev);
1619
1620         /* Add link local route */
1621         addrconf_add_lroute(dev);
1622         return idev;
1623 }
1624
1625 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1626 {
1627         struct prefix_info *pinfo;
1628         __u32 valid_lft;
1629         __u32 prefered_lft;
1630         int addr_type;
1631         unsigned long rt_expires;
1632         struct inet6_dev *in6_dev;
1633
1634         pinfo = (struct prefix_info *) opt;
1635
1636         if (len < sizeof(struct prefix_info)) {
1637                 ADBG(("addrconf: prefix option too short\n"));
1638                 return;
1639         }
1640
1641         /*
1642          *      Validation checks ([ADDRCONF], page 19)
1643          */
1644
1645         addr_type = ipv6_addr_type(&pinfo->prefix);
1646
1647         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1648                 return;
1649
1650         valid_lft = ntohl(pinfo->valid);
1651         prefered_lft = ntohl(pinfo->prefered);
1652
1653         if (prefered_lft > valid_lft) {
1654                 if (net_ratelimit())
1655                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1656                 return;
1657         }
1658
1659         in6_dev = in6_dev_get(dev);
1660
1661         if (in6_dev == NULL) {
1662                 if (net_ratelimit())
1663                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1664                 return;
1665         }
1666
1667         /*
1668          *      Two things going on here:
1669          *      1) Add routes for on-link prefixes
1670          *      2) Configure prefixes with the auto flag set
1671          */
1672
1673         /* Avoid arithmetic overflow. Really, we could
1674            save rt_expires in seconds, likely valid_lft,
1675            but it would require division in fib gc, that it
1676            not good.
1677          */
1678         if (valid_lft >= 0x7FFFFFFF/HZ)
1679                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1680         else
1681                 rt_expires = valid_lft * HZ;
1682
1683         /*
1684          * We convert this (in jiffies) to clock_t later.
1685          * Avoid arithmetic overflow there as well.
1686          * Overflow can happen only if HZ < USER_HZ.
1687          */
1688         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1689                 rt_expires = 0x7FFFFFFF / USER_HZ;
1690
1691         if (pinfo->onlink) {
1692                 struct rt6_info *rt;
1693                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1694
1695                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1696                         if (rt->rt6i_flags&RTF_EXPIRES) {
1697                                 if (valid_lft == 0) {
1698                                         ip6_del_rt(rt);
1699                                         rt = NULL;
1700                                 } else {
1701                                         rt->rt6i_expires = jiffies + rt_expires;
1702                                 }
1703                         }
1704                 } else if (valid_lft) {
1705                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1706                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1707                 }
1708                 if (rt)
1709                         dst_release(&rt->u.dst);
1710         }
1711
1712         /* Try to figure out our local address for this prefix */
1713
1714         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1715                 struct inet6_ifaddr * ifp;
1716                 struct in6_addr addr;
1717                 int create = 0, update_lft = 0;
1718
1719                 if (pinfo->prefix_len == 64) {
1720                         memcpy(&addr, &pinfo->prefix, 8);
1721                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1722                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1723                                 in6_dev_put(in6_dev);
1724                                 return;
1725                         }
1726                         goto ok;
1727                 }
1728                 if (net_ratelimit())
1729                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1730                                pinfo->prefix_len);
1731                 in6_dev_put(in6_dev);
1732                 return;
1733
1734 ok:
1735
1736                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1737
1738                 if (ifp == NULL && valid_lft) {
1739                         int max_addresses = in6_dev->cnf.max_addresses;
1740                         u32 addr_flags = 0;
1741
1742 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1743                         if (in6_dev->cnf.optimistic_dad &&
1744                             !ipv6_devconf.forwarding)
1745                                 addr_flags = IFA_F_OPTIMISTIC;
1746 #endif
1747
1748                         /* Do not allow to create too much of autoconfigured
1749                          * addresses; this would be too easy way to crash kernel.
1750                          */
1751                         if (!max_addresses ||
1752                             ipv6_count_addresses(in6_dev) < max_addresses)
1753                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1754                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1755                                                     addr_flags);
1756
1757                         if (!ifp || IS_ERR(ifp)) {
1758                                 in6_dev_put(in6_dev);
1759                                 return;
1760                         }
1761
1762                         update_lft = create = 1;
1763                         ifp->cstamp = jiffies;
1764                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1765                 }
1766
1767                 if (ifp) {
1768                         int flags;
1769                         unsigned long now;
1770 #ifdef CONFIG_IPV6_PRIVACY
1771                         struct inet6_ifaddr *ift;
1772 #endif
1773                         u32 stored_lft;
1774
1775                         /* update lifetime (RFC2462 5.5.3 e) */
1776                         spin_lock(&ifp->lock);
1777                         now = jiffies;
1778                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1779                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1780                         else
1781                                 stored_lft = 0;
1782                         if (!update_lft && stored_lft) {
1783                                 if (valid_lft > MIN_VALID_LIFETIME ||
1784                                     valid_lft > stored_lft)
1785                                         update_lft = 1;
1786                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1787                                         /* valid_lft <= stored_lft is always true */
1788                                         /* XXX: IPsec */
1789                                         update_lft = 0;
1790                                 } else {
1791                                         valid_lft = MIN_VALID_LIFETIME;
1792                                         if (valid_lft < prefered_lft)
1793                                                 prefered_lft = valid_lft;
1794                                         update_lft = 1;
1795                                 }
1796                         }
1797
1798                         if (update_lft) {
1799                                 ifp->valid_lft = valid_lft;
1800                                 ifp->prefered_lft = prefered_lft;
1801                                 ifp->tstamp = now;
1802                                 flags = ifp->flags;
1803                                 ifp->flags &= ~IFA_F_DEPRECATED;
1804                                 spin_unlock(&ifp->lock);
1805
1806                                 if (!(flags&IFA_F_TENTATIVE))
1807                                         ipv6_ifa_notify(0, ifp);
1808                         } else
1809                                 spin_unlock(&ifp->lock);
1810
1811 #ifdef CONFIG_IPV6_PRIVACY
1812                         read_lock_bh(&in6_dev->lock);
1813                         /* update all temporary addresses in the list */
1814                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1815                                 /*
1816                                  * When adjusting the lifetimes of an existing
1817                                  * temporary address, only lower the lifetimes.
1818                                  * Implementations must not increase the
1819                                  * lifetimes of an existing temporary address
1820                                  * when processing a Prefix Information Option.
1821                                  */
1822                                 spin_lock(&ift->lock);
1823                                 flags = ift->flags;
1824                                 if (ift->valid_lft > valid_lft &&
1825                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1826                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1827                                 if (ift->prefered_lft > prefered_lft &&
1828                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1829                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1830                                 spin_unlock(&ift->lock);
1831                                 if (!(flags&IFA_F_TENTATIVE))
1832                                         ipv6_ifa_notify(0, ift);
1833                         }
1834
1835                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1836                                 /*
1837                                  * When a new public address is created as described in [ADDRCONF],
1838                                  * also create a new temporary address.
1839                                  */
1840                                 read_unlock_bh(&in6_dev->lock);
1841                                 ipv6_create_tempaddr(ifp, NULL);
1842                         } else {
1843                                 read_unlock_bh(&in6_dev->lock);
1844                         }
1845 #endif
1846                         in6_ifa_put(ifp);
1847                         addrconf_verify(0);
1848                 }
1849         }
1850         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1851         in6_dev_put(in6_dev);
1852 }
1853
1854 /*
1855  *      Set destination address.
1856  *      Special case for SIT interfaces where we create a new "virtual"
1857  *      device.
1858  */
1859 int addrconf_set_dstaddr(void __user *arg)
1860 {
1861         struct in6_ifreq ireq;
1862         struct net_device *dev;
1863         int err = -EINVAL;
1864
1865         rtnl_lock();
1866
1867         err = -EFAULT;
1868         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1869                 goto err_exit;
1870
1871         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1872
1873         err = -ENODEV;
1874         if (dev == NULL)
1875                 goto err_exit;
1876
1877 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1878         if (dev->type == ARPHRD_SIT) {
1879                 struct ifreq ifr;
1880                 mm_segment_t    oldfs;
1881                 struct ip_tunnel_parm p;
1882
1883                 err = -EADDRNOTAVAIL;
1884                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1885                         goto err_exit;
1886
1887                 memset(&p, 0, sizeof(p));
1888                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1889                 p.iph.saddr = 0;
1890                 p.iph.version = 4;
1891                 p.iph.ihl = 5;
1892                 p.iph.protocol = IPPROTO_IPV6;
1893                 p.iph.ttl = 64;
1894                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1895
1896                 oldfs = get_fs(); set_fs(KERNEL_DS);
1897                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1898                 set_fs(oldfs);
1899
1900                 if (err == 0) {
1901                         err = -ENOBUFS;
1902                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1903                                 goto err_exit;
1904                         err = dev_open(dev);
1905                 }
1906         }
1907 #endif
1908
1909 err_exit:
1910         rtnl_unlock();
1911         return err;
1912 }
1913
1914 /*
1915  *      Manual configuration of address on an interface
1916  */
1917 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1918                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1919 {
1920         struct inet6_ifaddr *ifp;
1921         struct inet6_dev *idev;
1922         struct net_device *dev;
1923         int scope;
1924         u32 flags = RTF_EXPIRES;
1925
1926         ASSERT_RTNL();
1927
1928         /* check the lifetime */
1929         if (!valid_lft || prefered_lft > valid_lft)
1930                 return -EINVAL;
1931
1932         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1933                 return -ENODEV;
1934
1935         if ((idev = addrconf_add_dev(dev)) == NULL)
1936                 return -ENOBUFS;
1937
1938         scope = ipv6_addr_scope(pfx);
1939
1940         if (valid_lft == INFINITY_LIFE_TIME) {
1941                 ifa_flags |= IFA_F_PERMANENT;
1942                 flags = 0;
1943         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1944                 valid_lft = 0x7FFFFFFF/HZ;
1945
1946         if (prefered_lft == 0)
1947                 ifa_flags |= IFA_F_DEPRECATED;
1948         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1949                  (prefered_lft != INFINITY_LIFE_TIME))
1950                 prefered_lft = 0x7FFFFFFF/HZ;
1951
1952         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1953
1954         if (!IS_ERR(ifp)) {
1955                 spin_lock_bh(&ifp->lock);
1956                 ifp->valid_lft = valid_lft;
1957                 ifp->prefered_lft = prefered_lft;
1958                 ifp->tstamp = jiffies;
1959                 spin_unlock_bh(&ifp->lock);
1960
1961                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1962                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1963                 /*
1964                  * Note that section 3.1 of RFC 4429 indicates
1965                  * that the Optimistic flag should not be set for
1966                  * manually configured addresses
1967                  */
1968                 addrconf_dad_start(ifp, 0);
1969                 in6_ifa_put(ifp);
1970                 addrconf_verify(0);
1971                 return 0;
1972         }
1973
1974         return PTR_ERR(ifp);
1975 }
1976
1977 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1978 {
1979         struct inet6_ifaddr *ifp;
1980         struct inet6_dev *idev;
1981         struct net_device *dev;
1982
1983         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1984                 return -ENODEV;
1985
1986         if ((idev = __in6_dev_get(dev)) == NULL)
1987                 return -ENXIO;
1988
1989         read_lock_bh(&idev->lock);
1990         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1991                 if (ifp->prefix_len == plen &&
1992                     ipv6_addr_equal(pfx, &ifp->addr)) {
1993                         in6_ifa_hold(ifp);
1994                         read_unlock_bh(&idev->lock);
1995
1996                         ipv6_del_addr(ifp);
1997
1998                         /* If the last address is deleted administratively,
1999                            disable IPv6 on this interface.
2000                          */
2001                         if (idev->addr_list == NULL)
2002                                 addrconf_ifdown(idev->dev, 1);
2003                         return 0;
2004                 }
2005         }
2006         read_unlock_bh(&idev->lock);
2007         return -EADDRNOTAVAIL;
2008 }
2009
2010
2011 int addrconf_add_ifaddr(void __user *arg)
2012 {
2013         struct in6_ifreq ireq;
2014         int err;
2015
2016         if (!capable(CAP_NET_ADMIN))
2017                 return -EPERM;
2018
2019         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2020                 return -EFAULT;
2021
2022         rtnl_lock();
2023         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2024                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2025         rtnl_unlock();
2026         return err;
2027 }
2028
2029 int addrconf_del_ifaddr(void __user *arg)
2030 {
2031         struct in6_ifreq ireq;
2032         int err;
2033
2034         if (!capable(CAP_NET_ADMIN))
2035                 return -EPERM;
2036
2037         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2038                 return -EFAULT;
2039
2040         rtnl_lock();
2041         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2042         rtnl_unlock();
2043         return err;
2044 }
2045
2046 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2047 static void sit_add_v4_addrs(struct inet6_dev *idev)
2048 {
2049         struct inet6_ifaddr * ifp;
2050         struct in6_addr addr;
2051         struct net_device *dev;
2052         int scope;
2053
2054         ASSERT_RTNL();
2055
2056         memset(&addr, 0, sizeof(struct in6_addr));
2057         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2058
2059         if (idev->dev->flags&IFF_POINTOPOINT) {
2060                 addr.s6_addr32[0] = htonl(0xfe800000);
2061                 scope = IFA_LINK;
2062         } else {
2063                 scope = IPV6_ADDR_COMPATv4;
2064         }
2065
2066         if (addr.s6_addr32[3]) {
2067                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2068                 if (!IS_ERR(ifp)) {
2069                         spin_lock_bh(&ifp->lock);
2070                         ifp->flags &= ~IFA_F_TENTATIVE;
2071                         spin_unlock_bh(&ifp->lock);
2072                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2073                         in6_ifa_put(ifp);
2074                 }
2075                 return;
2076         }
2077
2078         for_each_netdev(&init_net, dev) {
2079                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2080                 if (in_dev && (dev->flags & IFF_UP)) {
2081                         struct in_ifaddr * ifa;
2082
2083                         int flag = scope;
2084
2085                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2086                                 int plen;
2087
2088                                 addr.s6_addr32[3] = ifa->ifa_local;
2089
2090                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2091                                         continue;
2092                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2093                                         if (idev->dev->flags&IFF_POINTOPOINT)
2094                                                 continue;
2095                                         flag |= IFA_HOST;
2096                                 }
2097                                 if (idev->dev->flags&IFF_POINTOPOINT)
2098                                         plen = 64;
2099                                 else
2100                                         plen = 96;
2101
2102                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2103                                                     IFA_F_PERMANENT);
2104                                 if (!IS_ERR(ifp)) {
2105                                         spin_lock_bh(&ifp->lock);
2106                                         ifp->flags &= ~IFA_F_TENTATIVE;
2107                                         spin_unlock_bh(&ifp->lock);
2108                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2109                                         in6_ifa_put(ifp);
2110                                 }
2111                         }
2112                 }
2113         }
2114 }
2115 #endif
2116
2117 static void init_loopback(struct net_device *dev)
2118 {
2119         struct inet6_dev  *idev;
2120         struct inet6_ifaddr * ifp;
2121
2122         /* ::1 */
2123
2124         ASSERT_RTNL();
2125
2126         if ((idev = ipv6_find_idev(dev)) == NULL) {
2127                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2128                 return;
2129         }
2130
2131         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2132         if (!IS_ERR(ifp)) {
2133                 spin_lock_bh(&ifp->lock);
2134                 ifp->flags &= ~IFA_F_TENTATIVE;
2135                 spin_unlock_bh(&ifp->lock);
2136                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2137                 in6_ifa_put(ifp);
2138         }
2139 }
2140
2141 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2142 {
2143         struct inet6_ifaddr * ifp;
2144         u32 addr_flags = IFA_F_PERMANENT;
2145
2146 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2147         if (idev->cnf.optimistic_dad &&
2148             !ipv6_devconf.forwarding)
2149                 addr_flags |= IFA_F_OPTIMISTIC;
2150 #endif
2151
2152
2153         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2154         if (!IS_ERR(ifp)) {
2155                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2156                 addrconf_dad_start(ifp, 0);
2157                 in6_ifa_put(ifp);
2158         }
2159 }
2160
2161 static void addrconf_dev_config(struct net_device *dev)
2162 {
2163         struct in6_addr addr;
2164         struct inet6_dev    * idev;
2165
2166         ASSERT_RTNL();
2167
2168         if ((dev->type != ARPHRD_ETHER) &&
2169             (dev->type != ARPHRD_FDDI) &&
2170             (dev->type != ARPHRD_IEEE802_TR) &&
2171             (dev->type != ARPHRD_ARCNET) &&
2172             (dev->type != ARPHRD_INFINIBAND)) {
2173                 /* Alas, we support only Ethernet autoconfiguration. */
2174                 return;
2175         }
2176
2177         idev = addrconf_add_dev(dev);
2178         if (idev == NULL)
2179                 return;
2180
2181         memset(&addr, 0, sizeof(struct in6_addr));
2182         addr.s6_addr32[0] = htonl(0xFE800000);
2183
2184         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2185                 addrconf_add_linklocal(idev, &addr);
2186 }
2187
2188 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2189 static void addrconf_sit_config(struct net_device *dev)
2190 {
2191         struct inet6_dev *idev;
2192
2193         ASSERT_RTNL();
2194
2195         /*
2196          * Configure the tunnel with one of our IPv4
2197          * addresses... we should configure all of
2198          * our v4 addrs in the tunnel
2199          */
2200
2201         if ((idev = ipv6_find_idev(dev)) == NULL) {
2202                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2203                 return;
2204         }
2205
2206         if (dev->priv_flags & IFF_ISATAP) {
2207                 struct in6_addr addr;
2208
2209                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2210                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2211                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2212                         addrconf_add_linklocal(idev, &addr);
2213                 return;
2214         }
2215
2216         sit_add_v4_addrs(idev);
2217
2218         if (dev->flags&IFF_POINTOPOINT) {
2219                 addrconf_add_mroute(dev);
2220                 addrconf_add_lroute(dev);
2221         } else
2222                 sit_route_add(dev);
2223 }
2224 #endif
2225
2226 static inline int
2227 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2228 {
2229         struct in6_addr lladdr;
2230
2231         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2232                 addrconf_add_linklocal(idev, &lladdr);
2233                 return 0;
2234         }
2235         return -1;
2236 }
2237
2238 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2239 {
2240         struct net_device *link_dev;
2241
2242         /* first try to inherit the link-local address from the link device */
2243         if (idev->dev->iflink &&
2244             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2245                 if (!ipv6_inherit_linklocal(idev, link_dev))
2246                         return;
2247         }
2248         /* then try to inherit it from any device */
2249         for_each_netdev(&init_net, link_dev) {
2250                 if (!ipv6_inherit_linklocal(idev, link_dev))
2251                         return;
2252         }
2253         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2254 }
2255
2256 /*
2257  * Autoconfigure tunnel with a link-local address so routing protocols,
2258  * DHCPv6, MLD etc. can be run over the virtual link
2259  */
2260
2261 static void addrconf_ip6_tnl_config(struct net_device *dev)
2262 {
2263         struct inet6_dev *idev;
2264
2265         ASSERT_RTNL();
2266
2267         if ((idev = addrconf_add_dev(dev)) == NULL) {
2268                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2269                 return;
2270         }
2271         ip6_tnl_add_linklocal(idev);
2272 }
2273
2274 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2275                            void * data)
2276 {
2277         struct net_device *dev = (struct net_device *) data;
2278         struct inet6_dev *idev = __in6_dev_get(dev);
2279         int run_pending = 0;
2280         int err;
2281
2282         if (dev->nd_net != &init_net)
2283                 return NOTIFY_DONE;
2284
2285         switch(event) {
2286         case NETDEV_REGISTER:
2287                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2288                         idev = ipv6_add_dev(dev);
2289                         if (!idev)
2290                                 return notifier_from_errno(-ENOMEM);
2291                 }
2292                 break;
2293         case NETDEV_UP:
2294         case NETDEV_CHANGE:
2295                 if (dev->flags & IFF_SLAVE)
2296                         break;
2297
2298                 if (event == NETDEV_UP) {
2299                         if (!addrconf_qdisc_ok(dev)) {
2300                                 /* device is not ready yet. */
2301                                 printk(KERN_INFO
2302                                         "ADDRCONF(NETDEV_UP): %s: "
2303                                         "link is not ready\n",
2304                                         dev->name);
2305                                 break;
2306                         }
2307
2308                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2309                                 idev = ipv6_add_dev(dev);
2310
2311                         if (idev)
2312                                 idev->if_flags |= IF_READY;
2313                 } else {
2314                         if (!addrconf_qdisc_ok(dev)) {
2315                                 /* device is still not ready. */
2316                                 break;
2317                         }
2318
2319                         if (idev) {
2320                                 if (idev->if_flags & IF_READY) {
2321                                         /* device is already configured. */
2322                                         break;
2323                                 }
2324                                 idev->if_flags |= IF_READY;
2325                         }
2326
2327                         printk(KERN_INFO
2328                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2329                                         "link becomes ready\n",
2330                                         dev->name);
2331
2332                         run_pending = 1;
2333                 }
2334
2335                 switch(dev->type) {
2336 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2337                 case ARPHRD_SIT:
2338                         addrconf_sit_config(dev);
2339                         break;
2340 #endif
2341                 case ARPHRD_TUNNEL6:
2342                         addrconf_ip6_tnl_config(dev);
2343                         break;
2344                 case ARPHRD_LOOPBACK:
2345                         init_loopback(dev);
2346                         break;
2347
2348                 default:
2349                         addrconf_dev_config(dev);
2350                         break;
2351                 }
2352                 if (idev) {
2353                         if (run_pending)
2354                                 addrconf_dad_run(idev);
2355
2356                         /* If the MTU changed during the interface down, when the
2357                            interface up, the changed MTU must be reflected in the
2358                            idev as well as routers.
2359                          */
2360                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2361                                 rt6_mtu_change(dev, dev->mtu);
2362                                 idev->cnf.mtu6 = dev->mtu;
2363                         }
2364                         idev->tstamp = jiffies;
2365                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2366                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2367                            stop IPv6 on this interface.
2368                          */
2369                         if (dev->mtu < IPV6_MIN_MTU)
2370                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2371                 }
2372                 break;
2373
2374         case NETDEV_CHANGEMTU:
2375                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2376                         rt6_mtu_change(dev, dev->mtu);
2377                         idev->cnf.mtu6 = dev->mtu;
2378                         break;
2379                 }
2380
2381                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2382                         idev = ipv6_add_dev(dev);
2383                         if (idev)
2384                                 break;
2385                 }
2386
2387                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2388
2389         case NETDEV_DOWN:
2390         case NETDEV_UNREGISTER:
2391                 /*
2392                  *      Remove all addresses from this interface.
2393                  */
2394                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2395                 break;
2396
2397         case NETDEV_CHANGENAME:
2398                 if (idev) {
2399                         snmp6_unregister_dev(idev);
2400                         addrconf_sysctl_unregister(idev);
2401                         addrconf_sysctl_register(idev);
2402                         err = snmp6_register_dev(idev);
2403                         if (err)
2404                                 return notifier_from_errno(err);
2405                 }
2406                 break;
2407         }
2408
2409         return NOTIFY_OK;
2410 }
2411
2412 /*
2413  *      addrconf module should be notified of a device going up
2414  */
2415 static struct notifier_block ipv6_dev_notf = {
2416         .notifier_call = addrconf_notify,
2417         .priority = 0
2418 };
2419
2420 static int addrconf_ifdown(struct net_device *dev, int how)
2421 {
2422         struct inet6_dev *idev;
2423         struct inet6_ifaddr *ifa, **bifa;
2424         int i;
2425
2426         ASSERT_RTNL();
2427
2428         if (dev == init_net.loopback_dev && how == 1)
2429                 how = 0;
2430
2431         rt6_ifdown(dev);
2432         neigh_ifdown(&nd_tbl, dev);
2433
2434         idev = __in6_dev_get(dev);
2435         if (idev == NULL)
2436                 return -ENODEV;
2437
2438         /* Step 1: remove reference to ipv6 device from parent device.
2439                    Do not dev_put!
2440          */
2441         if (how == 1) {
2442                 idev->dead = 1;
2443
2444                 /* protected by rtnl_lock */
2445                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2446
2447                 /* Step 1.5: remove snmp6 entry */
2448                 snmp6_unregister_dev(idev);
2449
2450         }
2451
2452         /* Step 2: clear hash table */
2453         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2454                 bifa = &inet6_addr_lst[i];
2455
2456                 write_lock_bh(&addrconf_hash_lock);
2457                 while ((ifa = *bifa) != NULL) {
2458                         if (ifa->idev == idev) {
2459                                 *bifa = ifa->lst_next;
2460                                 ifa->lst_next = NULL;
2461                                 addrconf_del_timer(ifa);
2462                                 in6_ifa_put(ifa);
2463                                 continue;
2464                         }
2465                         bifa = &ifa->lst_next;
2466                 }
2467                 write_unlock_bh(&addrconf_hash_lock);
2468         }
2469
2470         write_lock_bh(&idev->lock);
2471
2472         /* Step 3: clear flags for stateless addrconf */
2473         if (how != 1)
2474                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2475
2476         /* Step 4: clear address list */
2477 #ifdef CONFIG_IPV6_PRIVACY
2478         if (how == 1 && del_timer(&idev->regen_timer))
2479                 in6_dev_put(idev);
2480
2481         /* clear tempaddr list */
2482         while ((ifa = idev->tempaddr_list) != NULL) {
2483                 idev->tempaddr_list = ifa->tmp_next;
2484                 ifa->tmp_next = NULL;
2485                 ifa->dead = 1;
2486                 write_unlock_bh(&idev->lock);
2487                 spin_lock_bh(&ifa->lock);
2488
2489                 if (ifa->ifpub) {
2490                         in6_ifa_put(ifa->ifpub);
2491                         ifa->ifpub = NULL;
2492                 }
2493                 spin_unlock_bh(&ifa->lock);
2494                 in6_ifa_put(ifa);
2495                 write_lock_bh(&idev->lock);
2496         }
2497 #endif
2498         while ((ifa = idev->addr_list) != NULL) {
2499                 idev->addr_list = ifa->if_next;
2500                 ifa->if_next = NULL;
2501                 ifa->dead = 1;
2502                 addrconf_del_timer(ifa);
2503                 write_unlock_bh(&idev->lock);
2504
2505                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2506                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2507                 in6_ifa_put(ifa);
2508
2509                 write_lock_bh(&idev->lock);
2510         }
2511         write_unlock_bh(&idev->lock);
2512
2513         /* Step 5: Discard multicast list */
2514
2515         if (how == 1)
2516                 ipv6_mc_destroy_dev(idev);
2517         else
2518                 ipv6_mc_down(idev);
2519
2520         idev->tstamp = jiffies;
2521
2522         /* Shot the device (if unregistered) */
2523
2524         if (how == 1) {
2525                 addrconf_sysctl_unregister(idev);
2526                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2527                 neigh_ifdown(&nd_tbl, dev);
2528                 in6_dev_put(idev);
2529         }
2530         return 0;
2531 }
2532
2533 static void addrconf_rs_timer(unsigned long data)
2534 {
2535         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2536
2537         if (ifp->idev->cnf.forwarding)
2538                 goto out;
2539
2540         if (ifp->idev->if_flags & IF_RA_RCVD) {
2541                 /*
2542                  *      Announcement received after solicitation
2543                  *      was sent
2544                  */
2545                 goto out;
2546         }
2547
2548         spin_lock(&ifp->lock);
2549         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2550                 struct in6_addr all_routers;
2551
2552                 /* The wait after the last probe can be shorter */
2553                 addrconf_mod_timer(ifp, AC_RS,
2554                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2555                                    ifp->idev->cnf.rtr_solicit_delay :
2556                                    ifp->idev->cnf.rtr_solicit_interval);
2557                 spin_unlock(&ifp->lock);
2558
2559                 ipv6_addr_all_routers(&all_routers);
2560
2561                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2562         } else {
2563                 spin_unlock(&ifp->lock);
2564                 /*
2565                  * Note: we do not support deprecated "all on-link"
2566                  * assumption any longer.
2567                  */
2568                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2569                        ifp->idev->dev->name);
2570         }
2571
2572 out:
2573         in6_ifa_put(ifp);
2574 }
2575
2576 /*
2577  *      Duplicate Address Detection
2578  */
2579 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2580 {
2581         unsigned long rand_num;
2582         struct inet6_dev *idev = ifp->idev;
2583
2584         if (ifp->flags & IFA_F_OPTIMISTIC)
2585                 rand_num = 0;
2586         else
2587                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2588
2589         ifp->probes = idev->cnf.dad_transmits;
2590         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2591 }
2592
2593 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2594 {
2595         struct inet6_dev *idev = ifp->idev;
2596         struct net_device *dev = idev->dev;
2597
2598         addrconf_join_solict(dev, &ifp->addr);
2599
2600         net_srandom(ifp->addr.s6_addr32[3]);
2601
2602         read_lock_bh(&idev->lock);
2603         if (ifp->dead)
2604                 goto out;
2605         spin_lock_bh(&ifp->lock);
2606
2607         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2608             !(ifp->flags&IFA_F_TENTATIVE) ||
2609             ifp->flags & IFA_F_NODAD) {
2610                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2611                 spin_unlock_bh(&ifp->lock);
2612                 read_unlock_bh(&idev->lock);
2613
2614                 addrconf_dad_completed(ifp);
2615                 return;
2616         }
2617
2618         if (!(idev->if_flags & IF_READY)) {
2619                 spin_unlock_bh(&ifp->lock);
2620                 read_unlock_bh(&idev->lock);
2621                 /*
2622                  * If the defice is not ready:
2623                  * - keep it tentative if it is a permanent address.
2624                  * - otherwise, kill it.
2625                  */
2626                 in6_ifa_hold(ifp);
2627                 addrconf_dad_stop(ifp);
2628                 return;
2629         }
2630
2631         /*
2632          * Optimistic nodes can start receiving
2633          * Frames right away
2634          */
2635         if(ifp->flags & IFA_F_OPTIMISTIC)
2636                 ip6_ins_rt(ifp->rt);
2637
2638         addrconf_dad_kick(ifp);
2639         spin_unlock_bh(&ifp->lock);
2640 out:
2641         read_unlock_bh(&idev->lock);
2642 }
2643
2644 static void addrconf_dad_timer(unsigned long data)
2645 {
2646         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2647         struct inet6_dev *idev = ifp->idev;
2648         struct in6_addr unspec;
2649         struct in6_addr mcaddr;
2650
2651         read_lock_bh(&idev->lock);
2652         if (idev->dead) {
2653                 read_unlock_bh(&idev->lock);
2654                 goto out;
2655         }
2656         spin_lock_bh(&ifp->lock);
2657         if (ifp->probes == 0) {
2658                 /*
2659                  * DAD was successful
2660                  */
2661
2662                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2663                 spin_unlock_bh(&ifp->lock);
2664                 read_unlock_bh(&idev->lock);
2665
2666                 addrconf_dad_completed(ifp);
2667
2668                 goto out;
2669         }
2670
2671         ifp->probes--;
2672         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2673         spin_unlock_bh(&ifp->lock);
2674         read_unlock_bh(&idev->lock);
2675
2676         /* send a neighbour solicitation for our addr */
2677         memset(&unspec, 0, sizeof(unspec));
2678         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2679         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2680 out:
2681         in6_ifa_put(ifp);
2682 }
2683
2684 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2685 {
2686         struct net_device *     dev = ifp->idev->dev;
2687
2688         /*
2689          *      Configure the address for reception. Now it is valid.
2690          */
2691
2692         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2693
2694         /* If added prefix is link local and forwarding is off,
2695            start sending router solicitations.
2696          */
2697
2698         if (ifp->idev->cnf.forwarding == 0 &&
2699             ifp->idev->cnf.rtr_solicits > 0 &&
2700             (dev->flags&IFF_LOOPBACK) == 0 &&
2701             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2702                 struct in6_addr all_routers;
2703
2704                 ipv6_addr_all_routers(&all_routers);
2705
2706                 /*
2707                  *      If a host as already performed a random delay
2708                  *      [...] as part of DAD [...] there is no need
2709                  *      to delay again before sending the first RS
2710                  */
2711                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2712
2713                 spin_lock_bh(&ifp->lock);
2714                 ifp->probes = 1;
2715                 ifp->idev->if_flags |= IF_RS_SENT;
2716                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2717                 spin_unlock_bh(&ifp->lock);
2718         }
2719 }
2720
2721 static void addrconf_dad_run(struct inet6_dev *idev) {
2722         struct inet6_ifaddr *ifp;
2723
2724         read_lock_bh(&idev->lock);
2725         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2726                 spin_lock_bh(&ifp->lock);
2727                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2728                         spin_unlock_bh(&ifp->lock);
2729                         continue;
2730                 }
2731                 spin_unlock_bh(&ifp->lock);
2732                 addrconf_dad_kick(ifp);
2733         }
2734         read_unlock_bh(&idev->lock);
2735 }
2736
2737 #ifdef CONFIG_PROC_FS
2738 struct if6_iter_state {
2739         int bucket;
2740 };
2741
2742 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2743 {
2744         struct inet6_ifaddr *ifa = NULL;
2745         struct if6_iter_state *state = seq->private;
2746
2747         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2748                 ifa = inet6_addr_lst[state->bucket];
2749                 if (ifa)
2750                         break;
2751         }
2752         return ifa;
2753 }
2754
2755 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2756 {
2757         struct if6_iter_state *state = seq->private;
2758
2759         ifa = ifa->lst_next;
2760 try_again:
2761         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2762                 ifa = inet6_addr_lst[state->bucket];
2763                 goto try_again;
2764         }
2765         return ifa;
2766 }
2767
2768 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2769 {
2770         struct inet6_ifaddr *ifa = if6_get_first(seq);
2771
2772         if (ifa)
2773                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2774                         --pos;
2775         return pos ? NULL : ifa;
2776 }
2777
2778 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2779 {
2780         read_lock_bh(&addrconf_hash_lock);
2781         return if6_get_idx(seq, *pos);
2782 }
2783
2784 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2785 {
2786         struct inet6_ifaddr *ifa;
2787
2788         ifa = if6_get_next(seq, v);
2789         ++*pos;
2790         return ifa;
2791 }
2792
2793 static void if6_seq_stop(struct seq_file *seq, void *v)
2794 {
2795         read_unlock_bh(&addrconf_hash_lock);
2796 }
2797
2798 static int if6_seq_show(struct seq_file *seq, void *v)
2799 {
2800         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2801         seq_printf(seq,
2802                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2803                    NIP6(ifp->addr),
2804                    ifp->idev->dev->ifindex,
2805                    ifp->prefix_len,
2806                    ifp->scope,
2807                    ifp->flags,
2808                    ifp->idev->dev->name);
2809         return 0;
2810 }
2811
2812 static const struct seq_operations if6_seq_ops = {
2813         .start  = if6_seq_start,
2814         .next   = if6_seq_next,
2815         .show   = if6_seq_show,
2816         .stop   = if6_seq_stop,
2817 };
2818
2819 static int if6_seq_open(struct inode *inode, struct file *file)
2820 {
2821         return seq_open_private(file, &if6_seq_ops,
2822                         sizeof(struct if6_iter_state));
2823 }
2824
2825 static const struct file_operations if6_fops = {
2826         .owner          = THIS_MODULE,
2827         .open           = if6_seq_open,
2828         .read           = seq_read,
2829         .llseek         = seq_lseek,
2830         .release        = seq_release_private,
2831 };
2832
2833 int __init if6_proc_init(void)
2834 {
2835         if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2836                 return -ENOMEM;
2837         return 0;
2838 }
2839
2840 void if6_proc_exit(void)
2841 {
2842         proc_net_remove(&init_net, "if_inet6");
2843 }
2844 #endif  /* CONFIG_PROC_FS */
2845
2846 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2847 /* Check if address is a home address configured on any interface. */
2848 int ipv6_chk_home_addr(struct in6_addr *addr)
2849 {
2850         int ret = 0;
2851         struct inet6_ifaddr * ifp;
2852         u8 hash = ipv6_addr_hash(addr);
2853         read_lock_bh(&addrconf_hash_lock);
2854         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2855                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2856                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2857                         ret = 1;
2858                         break;
2859                 }
2860         }
2861         read_unlock_bh(&addrconf_hash_lock);
2862         return ret;
2863 }
2864 #endif
2865
2866 /*
2867  *      Periodic address status verification
2868  */
2869
2870 static void addrconf_verify(unsigned long foo)
2871 {
2872         struct inet6_ifaddr *ifp;
2873         unsigned long now, next;
2874         int i;
2875
2876         spin_lock_bh(&addrconf_verify_lock);
2877         now = jiffies;
2878         next = now + ADDR_CHECK_FREQUENCY;
2879
2880         del_timer(&addr_chk_timer);
2881
2882         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2883
2884 restart:
2885                 read_lock(&addrconf_hash_lock);
2886                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2887                         unsigned long age;
2888 #ifdef CONFIG_IPV6_PRIVACY
2889                         unsigned long regen_advance;
2890 #endif
2891
2892                         if (ifp->flags & IFA_F_PERMANENT)
2893                                 continue;
2894
2895                         spin_lock(&ifp->lock);
2896                         age = (now - ifp->tstamp) / HZ;
2897
2898 #ifdef CONFIG_IPV6_PRIVACY
2899                         regen_advance = ifp->idev->cnf.regen_max_retry *
2900                                         ifp->idev->cnf.dad_transmits *
2901                                         ifp->idev->nd_parms->retrans_time / HZ;
2902 #endif
2903
2904                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2905                             age >= ifp->valid_lft) {
2906                                 spin_unlock(&ifp->lock);
2907                                 in6_ifa_hold(ifp);
2908                                 read_unlock(&addrconf_hash_lock);
2909                                 ipv6_del_addr(ifp);
2910                                 goto restart;
2911                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2912                                 spin_unlock(&ifp->lock);
2913                                 continue;
2914                         } else if (age >= ifp->prefered_lft) {
2915                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2916                                 int deprecate = 0;
2917
2918                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2919                                         deprecate = 1;
2920                                         ifp->flags |= IFA_F_DEPRECATED;
2921                                 }
2922
2923                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2924                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2925
2926                                 spin_unlock(&ifp->lock);
2927
2928                                 if (deprecate) {
2929                                         in6_ifa_hold(ifp);
2930                                         read_unlock(&addrconf_hash_lock);
2931
2932                                         ipv6_ifa_notify(0, ifp);
2933                                         in6_ifa_put(ifp);
2934                                         goto restart;
2935                                 }
2936 #ifdef CONFIG_IPV6_PRIVACY
2937                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2938                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2939                                 if (age >= ifp->prefered_lft - regen_advance) {
2940                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2941                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2942                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2943                                         if (!ifp->regen_count && ifpub) {
2944                                                 ifp->regen_count++;
2945                                                 in6_ifa_hold(ifp);
2946                                                 in6_ifa_hold(ifpub);
2947                                                 spin_unlock(&ifp->lock);
2948                                                 read_unlock(&addrconf_hash_lock);
2949                                                 spin_lock(&ifpub->lock);
2950                                                 ifpub->regen_count = 0;
2951                                                 spin_unlock(&ifpub->lock);
2952                                                 ipv6_create_tempaddr(ifpub, ifp);
2953                                                 in6_ifa_put(ifpub);
2954                                                 in6_ifa_put(ifp);
2955                                                 goto restart;
2956                                         }
2957                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2958                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2959                                 spin_unlock(&ifp->lock);
2960 #endif
2961                         } else {
2962                                 /* ifp->prefered_lft <= ifp->valid_lft */
2963                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2964                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2965                                 spin_unlock(&ifp->lock);
2966                         }
2967                 }
2968                 read_unlock(&addrconf_hash_lock);
2969         }
2970
2971         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2972         add_timer(&addr_chk_timer);
2973         spin_unlock_bh(&addrconf_verify_lock);
2974 }
2975
2976 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2977 {
2978         struct in6_addr *pfx = NULL;
2979
2980         if (addr)
2981                 pfx = nla_data(addr);
2982
2983         if (local) {
2984                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2985                         pfx = NULL;
2986                 else
2987                         pfx = nla_data(local);
2988         }
2989
2990         return pfx;
2991 }
2992
2993 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2994         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2995         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2996         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2997 };
2998
2999 static int
3000 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3001 {
3002         struct net *net = skb->sk->sk_net;
3003         struct ifaddrmsg *ifm;
3004         struct nlattr *tb[IFA_MAX+1];
3005         struct in6_addr *pfx;
3006         int err;
3007
3008         if (net != &init_net)
3009                 return -EINVAL;
3010
3011         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3012         if (err < 0)
3013                 return err;
3014
3015         ifm = nlmsg_data(nlh);
3016         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3017         if (pfx == NULL)
3018                 return -EINVAL;
3019
3020         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3021 }
3022
3023 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3024                              u32 prefered_lft, u32 valid_lft)
3025 {
3026         u32 flags = RTF_EXPIRES;
3027
3028         if (!valid_lft || (prefered_lft > valid_lft))
3029                 return -EINVAL;
3030
3031         if (valid_lft == INFINITY_LIFE_TIME) {
3032                 ifa_flags |= IFA_F_PERMANENT;
3033                 flags = 0;
3034         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3035                 valid_lft = 0x7FFFFFFF/HZ;
3036
3037         if (prefered_lft == 0)
3038                 ifa_flags |= IFA_F_DEPRECATED;
3039         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3040                  (prefered_lft != INFINITY_LIFE_TIME))
3041                 prefered_lft = 0x7FFFFFFF/HZ;
3042
3043         spin_lock_bh(&ifp->lock);
3044         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3045         ifp->tstamp = jiffies;
3046         ifp->valid_lft = valid_lft;
3047         ifp->prefered_lft = prefered_lft;
3048
3049         spin_unlock_bh(&ifp->lock);
3050         if (!(ifp->flags&IFA_F_TENTATIVE))
3051                 ipv6_ifa_notify(0, ifp);
3052
3053         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3054                               jiffies_to_clock_t(valid_lft * HZ), flags);
3055         addrconf_verify(0);
3056
3057         return 0;
3058 }
3059
3060 static int
3061 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3062 {
3063         struct net *net = skb->sk->sk_net;
3064         struct ifaddrmsg *ifm;
3065         struct nlattr *tb[IFA_MAX+1];
3066         struct in6_addr *pfx;
3067         struct inet6_ifaddr *ifa;
3068         struct net_device *dev;
3069         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3070         u8 ifa_flags;
3071         int err;
3072
3073         if (net != &init_net)
3074                 return -EINVAL;
3075
3076         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3077         if (err < 0)
3078                 return err;
3079
3080         ifm = nlmsg_data(nlh);
3081         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3082         if (pfx == NULL)
3083                 return -EINVAL;
3084
3085         if (tb[IFA_CACHEINFO]) {
3086                 struct ifa_cacheinfo *ci;
3087
3088                 ci = nla_data(tb[IFA_CACHEINFO]);
3089                 valid_lft = ci->ifa_valid;
3090                 preferred_lft = ci->ifa_prefered;
3091         } else {
3092                 preferred_lft = INFINITY_LIFE_TIME;
3093                 valid_lft = INFINITY_LIFE_TIME;
3094         }
3095
3096         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3097         if (dev == NULL)
3098                 return -ENODEV;
3099
3100         /* We ignore other flags so far. */
3101         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3102
3103         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3104         if (ifa == NULL) {
3105                 /*
3106                  * It would be best to check for !NLM_F_CREATE here but
3107                  * userspace alreay relies on not having to provide this.
3108                  */
3109                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3110                                       ifa_flags, preferred_lft, valid_lft);
3111         }
3112
3113         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3114             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3115                 err = -EEXIST;
3116         else
3117                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3118
3119         in6_ifa_put(ifa);
3120
3121         return err;
3122 }
3123
3124 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3125                           u8 scope, int ifindex)
3126 {
3127         struct ifaddrmsg *ifm;
3128
3129         ifm = nlmsg_data(nlh);
3130         ifm->ifa_family = AF_INET6;
3131         ifm->ifa_prefixlen = prefixlen;
3132         ifm->ifa_flags = flags;
3133         ifm->ifa_scope = scope;
3134         ifm->ifa_index = ifindex;
3135 }
3136
3137 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3138                          unsigned long tstamp, u32 preferred, u32 valid)
3139 {
3140         struct ifa_cacheinfo ci;
3141
3142         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3143                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3144         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3145                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3146         ci.ifa_prefered = preferred;
3147         ci.ifa_valid = valid;
3148
3149         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3150 }
3151
3152 static inline int rt_scope(int ifa_scope)
3153 {
3154         if (ifa_scope & IFA_HOST)
3155                 return RT_SCOPE_HOST;
3156         else if (ifa_scope & IFA_LINK)
3157                 return RT_SCOPE_LINK;
3158         else if (ifa_scope & IFA_SITE)
3159                 return RT_SCOPE_SITE;
3160         else
3161                 return RT_SCOPE_UNIVERSE;
3162 }
3163
3164 static inline int inet6_ifaddr_msgsize(void)
3165 {
3166         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3167                + nla_total_size(16) /* IFA_ADDRESS */
3168                + nla_total_size(sizeof(struct ifa_cacheinfo));
3169 }
3170
3171 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3172                              u32 pid, u32 seq, int event, unsigned int flags)
3173 {
3174         struct nlmsghdr  *nlh;
3175         u32 preferred, valid;
3176
3177         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3178         if (nlh == NULL)
3179                 return -EMSGSIZE;
3180
3181         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3182                       ifa->idev->dev->ifindex);
3183
3184         if (!(ifa->flags&IFA_F_PERMANENT)) {
3185                 preferred = ifa->prefered_lft;
3186                 valid = ifa->valid_lft;
3187                 if (preferred != INFINITY_LIFE_TIME) {
3188                         long tval = (jiffies - ifa->tstamp)/HZ;
3189                         preferred -= tval;
3190                         if (valid != INFINITY_LIFE_TIME)
3191                                 valid -= tval;
3192                 }
3193         } else {
3194                 preferred = INFINITY_LIFE_TIME;
3195                 valid = INFINITY_LIFE_TIME;
3196         }
3197
3198         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3199             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3200                 nlmsg_cancel(skb, nlh);
3201                 return -EMSGSIZE;
3202         }
3203
3204         return nlmsg_end(skb, nlh);
3205 }
3206
3207 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3208                                 u32 pid, u32 seq, int event, u16 flags)
3209 {
3210         struct nlmsghdr  *nlh;
3211         u8 scope = RT_SCOPE_UNIVERSE;
3212         int ifindex = ifmca->idev->dev->ifindex;
3213
3214         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3215                 scope = RT_SCOPE_SITE;
3216
3217         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3218         if (nlh == NULL)
3219                 return -EMSGSIZE;
3220
3221         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3222         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3223             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3224                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3225                 nlmsg_cancel(skb, nlh);
3226                 return -EMSGSIZE;
3227         }
3228
3229         return nlmsg_end(skb, nlh);
3230 }
3231
3232 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3233                                 u32 pid, u32 seq, int event, unsigned int flags)
3234 {
3235         struct nlmsghdr  *nlh;
3236         u8 scope = RT_SCOPE_UNIVERSE;
3237         int ifindex = ifaca->aca_idev->dev->ifindex;
3238
3239         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3240                 scope = RT_SCOPE_SITE;
3241
3242         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3243         if (nlh == NULL)
3244                 return -EMSGSIZE;
3245
3246         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3247         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3248             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3249                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3250                 nlmsg_cancel(skb, nlh);
3251                 return -EMSGSIZE;
3252         }
3253
3254         return nlmsg_end(skb, nlh);
3255 }
3256
3257 enum addr_type_t
3258 {
3259         UNICAST_ADDR,
3260         MULTICAST_ADDR,
3261         ANYCAST_ADDR,
3262 };
3263
3264 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3265                            enum addr_type_t type)
3266 {
3267         int idx, ip_idx;
3268         int s_idx, s_ip_idx;
3269         int err = 1;
3270         struct net_device *dev;
3271         struct inet6_dev *idev = NULL;
3272         struct inet6_ifaddr *ifa;
3273         struct ifmcaddr6 *ifmca;
3274         struct ifacaddr6 *ifaca;
3275
3276         s_idx = cb->args[0];
3277         s_ip_idx = ip_idx = cb->args[1];
3278
3279         idx = 0;
3280         for_each_netdev(&init_net, dev) {
3281                 if (idx < s_idx)
3282                         goto cont;
3283                 if (idx > s_idx)
3284                         s_ip_idx = 0;
3285                 ip_idx = 0;
3286                 if ((idev = in6_dev_get(dev)) == NULL)
3287                         goto cont;
3288                 read_lock_bh(&idev->lock);
3289                 switch (type) {
3290                 case UNICAST_ADDR:
3291                         /* unicast address incl. temp addr */
3292                         for (ifa = idev->addr_list; ifa;
3293                              ifa = ifa->if_next, ip_idx++) {
3294                                 if (ip_idx < s_ip_idx)
3295                                         continue;
3296                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3297                                     NETLINK_CB(cb->skb).pid,
3298                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3299                                     NLM_F_MULTI)) <= 0)
3300                                         goto done;
3301                         }
3302                         break;
3303                 case MULTICAST_ADDR:
3304                         /* multicast address */
3305                         for (ifmca = idev->mc_list; ifmca;
3306                              ifmca = ifmca->next, ip_idx++) {
3307                                 if (ip_idx < s_ip_idx)
3308                                         continue;
3309                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3310                                     NETLINK_CB(cb->skb).pid,
3311                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3312                                     NLM_F_MULTI)) <= 0)
3313                                         goto done;
3314                         }
3315                         break;
3316                 case ANYCAST_ADDR:
3317                         /* anycast address */
3318                         for (ifaca = idev->ac_list; ifaca;
3319                              ifaca = ifaca->aca_next, ip_idx++) {
3320                                 if (ip_idx < s_ip_idx)
3321                                         continue;
3322                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3323                                     NETLINK_CB(cb->skb).pid,
3324                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3325                                     NLM_F_MULTI)) <= 0)
3326                                         goto done;
3327                         }
3328                         break;
3329                 default:
3330                         break;
3331                 }
3332                 read_unlock_bh(&idev->lock);
3333                 in6_dev_put(idev);
3334 cont:
3335                 idx++;
3336         }
3337 done:
3338         if (err <= 0) {
3339                 read_unlock_bh(&idev->lock);
3340                 in6_dev_put(idev);
3341         }
3342         cb->args[0] = idx;
3343         cb->args[1] = ip_idx;
3344         return skb->len;
3345 }
3346
3347 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3348 {
3349         struct net *net = skb->sk->sk_net;
3350         enum addr_type_t type = UNICAST_ADDR;
3351
3352         if (net != &init_net)
3353                 return 0;
3354
3355         return inet6_dump_addr(skb, cb, type);
3356 }
3357
3358 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3359 {
3360         struct net *net = skb->sk->sk_net;
3361         enum addr_type_t type = MULTICAST_ADDR;
3362
3363         if (net != &init_net)
3364                 return 0;
3365
3366         return inet6_dump_addr(skb, cb, type);
3367 }
3368
3369
3370 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3371 {
3372         struct net *net = skb->sk->sk_net;
3373         enum addr_type_t type = ANYCAST_ADDR;
3374
3375         if (net != &init_net)
3376                 return 0;
3377
3378         return inet6_dump_addr(skb, cb, type);
3379 }
3380
3381 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3382                              void *arg)
3383 {
3384         struct net *net = in_skb->sk->sk_net;
3385         struct ifaddrmsg *ifm;
3386         struct nlattr *tb[IFA_MAX+1];
3387         struct in6_addr *addr = NULL;
3388         struct net_device *dev = NULL;
3389         struct inet6_ifaddr *ifa;
3390         struct sk_buff *skb;
3391         int err;
3392
3393         if (net != &init_net)
3394                 return -EINVAL;
3395
3396         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3397         if (err < 0)
3398                 goto errout;
3399
3400         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3401         if (addr == NULL) {
3402                 err = -EINVAL;
3403                 goto errout;
3404         }
3405
3406         ifm = nlmsg_data(nlh);
3407         if (ifm->ifa_index)
3408                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3409
3410         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3411                 err = -EADDRNOTAVAIL;
3412                 goto errout;
3413         }
3414
3415         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3416                 err = -ENOBUFS;
3417                 goto errout_ifa;
3418         }
3419
3420         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3421                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3422         if (err < 0) {
3423                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3424                 WARN_ON(err == -EMSGSIZE);
3425                 kfree_skb(skb);
3426                 goto errout_ifa;
3427         }
3428         err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3429 errout_ifa:
3430         in6_ifa_put(ifa);
3431 errout:
3432         return err;
3433 }
3434
3435 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3436 {
3437         struct sk_buff *skb;
3438         int err = -ENOBUFS;
3439
3440         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3441         if (skb == NULL)
3442                 goto errout;
3443
3444         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3445         if (err < 0) {
3446                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3447                 WARN_ON(err == -EMSGSIZE);
3448                 kfree_skb(skb);
3449                 goto errout;
3450         }
3451         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3452 errout:
3453         if (err < 0)
3454                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3455 }
3456
3457 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3458                                 __s32 *array, int bytes)
3459 {
3460         BUG_ON(bytes < (DEVCONF_MAX * 4));
3461
3462         memset(array, 0, bytes);
3463         array[DEVCONF_FORWARDING] = cnf->forwarding;
3464         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3465         array[DEVCONF_MTU6] = cnf->mtu6;
3466         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3467         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3468         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3469         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3470         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3471         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3472         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3473         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3474 #ifdef CONFIG_IPV6_PRIVACY
3475         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3476         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3477         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3478         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3479         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3480 #endif
3481         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3482         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3483         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3484 #ifdef CONFIG_IPV6_ROUTER_PREF
3485         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3486         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3487 #ifdef CONFIG_IPV6_ROUTE_INFO
3488         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3489 #endif
3490 #endif
3491         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3492         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3493 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3494         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3495 #endif
3496 }
3497
3498 static inline size_t inet6_if_nlmsg_size(void)
3499 {
3500         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3501                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3502                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3503                + nla_total_size(4) /* IFLA_MTU */
3504                + nla_total_size(4) /* IFLA_LINK */
3505                + nla_total_size( /* IFLA_PROTINFO */
3506                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3507                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3508                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3509                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3510                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3511                  );
3512 }
3513
3514 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3515                                       int bytes)
3516 {
3517         int i;
3518         int pad = bytes - sizeof(u64) * items;
3519         BUG_ON(pad < 0);
3520
3521         /* Use put_unaligned() because stats may not be aligned for u64. */
3522         put_unaligned(items, &stats[0]);
3523         for (i = 1; i < items; i++)
3524                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3525
3526         memset(&stats[items], 0, pad);
3527 }
3528
3529 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3530                              int bytes)
3531 {
3532         switch(attrtype) {
3533         case IFLA_INET6_STATS:
3534                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3535                 break;
3536         case IFLA_INET6_ICMP6STATS:
3537                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3538                 break;
3539         }
3540 }
3541
3542 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3543                              u32 pid, u32 seq, int event, unsigned int flags)
3544 {
3545         struct net_device *dev = idev->dev;
3546         struct nlattr *nla;
3547         struct ifinfomsg *hdr;
3548         struct nlmsghdr *nlh;
3549         void *protoinfo;
3550         struct ifla_cacheinfo ci;
3551
3552         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3553         if (nlh == NULL)
3554                 return -EMSGSIZE;
3555
3556         hdr = nlmsg_data(nlh);
3557         hdr->ifi_family = AF_INET6;
3558         hdr->__ifi_pad = 0;
3559         hdr->ifi_type = dev->type;
3560         hdr->ifi_index = dev->ifindex;
3561         hdr->ifi_flags = dev_get_flags(dev);
3562         hdr->ifi_change = 0;
3563
3564         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3565
3566         if (dev->addr_len)
3567                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3568
3569         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3570         if (dev->ifindex != dev->iflink)
3571                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3572
3573         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3574         if (protoinfo == NULL)
3575                 goto nla_put_failure;
3576
3577         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3578
3579         ci.max_reasm_len = IPV6_MAXPLEN;
3580         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3581                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3582         ci.reachable_time = idev->nd_parms->reachable_time;
3583         ci.retrans_time = idev->nd_parms->retrans_time;
3584         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3585
3586         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3587         if (nla == NULL)
3588                 goto nla_put_failure;
3589         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3590
3591         /* XXX - MC not implemented */
3592
3593         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3594         if (nla == NULL)
3595                 goto nla_put_failure;
3596         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3597
3598         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3599         if (nla == NULL)
3600                 goto nla_put_failure;
3601         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3602
3603         nla_nest_end(skb, protoinfo);
3604         return nlmsg_end(skb, nlh);
3605
3606 nla_put_failure:
3607         nlmsg_cancel(skb, nlh);
3608         return -EMSGSIZE;
3609 }
3610
3611 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3612 {
3613         struct net *net = skb->sk->sk_net;
3614         int idx, err;
3615         int s_idx = cb->args[0];
3616         struct net_device *dev;
3617         struct inet6_dev *idev;
3618
3619         if (net != &init_net)
3620                 return 0;
3621
3622         read_lock(&dev_base_lock);
3623         idx = 0;
3624         for_each_netdev(&init_net, dev) {
3625                 if (idx < s_idx)
3626                         goto cont;
3627                 if ((idev = in6_dev_get(dev)) == NULL)
3628                         goto cont;
3629                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3630                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3631                 in6_dev_put(idev);
3632                 if (err <= 0)
3633                         break;
3634 cont:
3635                 idx++;
3636         }
3637         read_unlock(&dev_base_lock);
3638         cb->args[0] = idx;
3639
3640         return skb->len;
3641 }
3642
3643 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3644 {
3645         struct sk_buff *skb;
3646         int err = -ENOBUFS;
3647
3648         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3649         if (skb == NULL)
3650                 goto errout;
3651
3652         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3653         if (err < 0) {
3654                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3655                 WARN_ON(err == -EMSGSIZE);
3656                 kfree_skb(skb);
3657                 goto errout;
3658         }
3659         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3660 errout:
3661         if (err < 0)
3662                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3663 }
3664
3665 static inline size_t inet6_prefix_nlmsg_size(void)
3666 {
3667         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3668                + nla_total_size(sizeof(struct in6_addr))
3669                + nla_total_size(sizeof(struct prefix_cacheinfo));
3670 }
3671
3672 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3673                              struct prefix_info *pinfo, u32 pid, u32 seq,
3674                              int event, unsigned int flags)
3675 {
3676         struct prefixmsg *pmsg;
3677         struct nlmsghdr *nlh;
3678         struct prefix_cacheinfo ci;
3679
3680         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3681         if (nlh == NULL)
3682                 return -EMSGSIZE;
3683
3684         pmsg = nlmsg_data(nlh);
3685         pmsg->prefix_family = AF_INET6;
3686         pmsg->prefix_pad1 = 0;
3687         pmsg->prefix_pad2 = 0;
3688         pmsg->prefix_ifindex = idev->dev->ifindex;
3689         pmsg->prefix_len = pinfo->prefix_len;
3690         pmsg->prefix_type = pinfo->type;
3691         pmsg->prefix_pad3 = 0;
3692         pmsg->prefix_flags = 0;
3693         if (pinfo->onlink)
3694                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3695         if (pinfo->autoconf)
3696                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3697
3698         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3699
3700         ci.preferred_time = ntohl(pinfo->prefered);
3701         ci.valid_time = ntohl(pinfo->valid);
3702         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3703
3704         return nlmsg_end(skb, nlh);
3705
3706 nla_put_failure:
3707         nlmsg_cancel(skb, nlh);
3708         return -EMSGSIZE;
3709 }
3710
3711 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3712                          struct prefix_info *pinfo)
3713 {
3714         struct sk_buff *skb;
3715         int err = -ENOBUFS;
3716
3717         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3718         if (skb == NULL)
3719                 goto errout;
3720
3721         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3722         if (err < 0) {
3723                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3724                 WARN_ON(err == -EMSGSIZE);
3725                 kfree_skb(skb);
3726                 goto errout;
3727         }
3728         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3729 errout:
3730         if (err < 0)
3731                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3732 }
3733
3734 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3735 {
3736         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3737
3738         switch (event) {
3739         case RTM_NEWADDR:
3740                 /*
3741                  * If the address was optimistic
3742                  * we inserted the route at the start of
3743                  * our DAD process, so we don't need
3744                  * to do it again
3745                  */
3746                 if (!(ifp->rt->rt6i_node))
3747                         ip6_ins_rt(ifp->rt);
3748                 if (ifp->idev->cnf.forwarding)
3749                         addrconf_join_anycast(ifp);
3750                 break;
3751         case RTM_DELADDR:
3752                 if (ifp->idev->cnf.forwarding)
3753                         addrconf_leave_anycast(ifp);
3754                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3755                 dst_hold(&ifp->rt->u.dst);
3756                 if (ip6_del_rt(ifp->rt))
3757                         dst_free(&ifp->rt->u.dst);
3758                 break;
3759         }
3760 }
3761
3762 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3763 {
3764         rcu_read_lock_bh();
3765         if (likely(ifp->idev->dead == 0))
3766                 __ipv6_ifa_notify(event, ifp);
3767         rcu_read_unlock_bh();
3768 }
3769
3770 #ifdef CONFIG_SYSCTL
3771
3772 static
3773 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3774                            void __user *buffer, size_t *lenp, loff_t *ppos)
3775 {
3776         int *valp = ctl->data;
3777         int val = *valp;
3778         int ret;
3779
3780         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3781
3782         if (write)
3783                 addrconf_fixup_forwarding(ctl, valp, val);
3784         return ret;
3785 }
3786
3787 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3788                                             int __user *name, int nlen,
3789                                             void __user *oldval,
3790                                             size_t __user *oldlenp,
3791                                             void __user *newval, size_t newlen)
3792 {
3793         int *valp = table->data;
3794         int val = *valp;
3795         int new;
3796
3797         if (!newval || !newlen)
3798                 return 0;
3799         if (newlen != sizeof(int))
3800                 return -EINVAL;
3801         if (get_user(new, (int __user *)newval))
3802                 return -EFAULT;
3803         if (new == *valp)
3804                 return 0;
3805         if (oldval && oldlenp) {
3806                 size_t len;
3807                 if (get_user(len, oldlenp))
3808                         return -EFAULT;
3809                 if (len) {
3810                         if (len > table->maxlen)
3811                                 len = table->maxlen;
3812                         if (copy_to_user(oldval, valp, len))
3813                                 return -EFAULT;
3814                         if (put_user(len, oldlenp))
3815                                 return -EFAULT;
3816                 }
3817         }
3818
3819         *valp = new;
3820         addrconf_fixup_forwarding(table, valp, val);
3821         return 1;
3822 }
3823
3824 static struct addrconf_sysctl_table
3825 {
3826         struct ctl_table_header *sysctl_header;
3827         ctl_table addrconf_vars[__NET_IPV6_MAX];
3828         char *dev_name;
3829 } addrconf_sysctl __read_mostly = {
3830         .sysctl_header = NULL,
3831         .addrconf_vars = {
3832                 {
3833                         .ctl_name       =       NET_IPV6_FORWARDING,
3834                         .procname       =       "forwarding",
3835                         .data           =       &ipv6_devconf.forwarding,
3836                         .maxlen         =       sizeof(int),
3837                         .mode           =       0644,
3838                         .proc_handler   =       &addrconf_sysctl_forward,
3839                         .strategy       =       &addrconf_sysctl_forward_strategy,
3840                 },
3841                 {
3842                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3843                         .procname       =       "hop_limit",
3844                         .data           =       &ipv6_devconf.hop_limit,
3845                         .maxlen         =       sizeof(int),
3846                         .mode           =       0644,
3847                         .proc_handler   =       proc_dointvec,
3848                 },
3849                 {
3850                         .ctl_name       =       NET_IPV6_MTU,
3851                         .procname       =       "mtu",
3852                         .data           =       &ipv6_devconf.mtu6,
3853                         .maxlen         =       sizeof(int),
3854                         .mode           =       0644,
3855                         .proc_handler   =       &proc_dointvec,
3856                 },
3857                 {
3858                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3859                         .procname       =       "accept_ra",
3860                         .data           =       &ipv6_devconf.accept_ra,
3861                         .maxlen         =       sizeof(int),
3862                         .mode           =       0644,
3863                         .proc_handler   =       &proc_dointvec,
3864                 },
3865                 {
3866                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3867                         .procname       =       "accept_redirects",
3868                         .data           =       &ipv6_devconf.accept_redirects,
3869                         .maxlen         =       sizeof(int),
3870                         .mode           =       0644,
3871                         .proc_handler   =       &proc_dointvec,
3872                 },
3873                 {
3874                         .ctl_name       =       NET_IPV6_AUTOCONF,
3875                         .procname       =       "autoconf",
3876                         .data           =       &ipv6_devconf.autoconf,
3877                         .maxlen         =       sizeof(int),
3878                         .mode           =       0644,
3879                         .proc_handler   =       &proc_dointvec,
3880                 },
3881                 {
3882                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3883                         .procname       =       "dad_transmits",
3884                         .data           =       &ipv6_devconf.dad_transmits,
3885                         .maxlen         =       sizeof(int),
3886                         .mode           =       0644,
3887                         .proc_handler   =       &proc_dointvec,
3888                 },
3889                 {
3890                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3891                         .procname       =       "router_solicitations",
3892                         .data           =       &ipv6_devconf.rtr_solicits,
3893                         .maxlen         =       sizeof(int),
3894                         .mode           =       0644,
3895                         .proc_handler   =       &proc_dointvec,
3896                 },
3897                 {
3898                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3899                         .procname       =       "router_solicitation_interval",
3900                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3901                         .maxlen         =       sizeof(int),
3902                         .mode           =       0644,
3903                         .proc_handler   =       &proc_dointvec_jiffies,
3904                         .strategy       =       &sysctl_jiffies,
3905                 },
3906                 {
3907                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3908                         .procname       =       "router_solicitation_delay",
3909                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3910                         .maxlen         =       sizeof(int),
3911                         .mode           =       0644,
3912                         .proc_handler   =       &proc_dointvec_jiffies,
3913                         .strategy       =       &sysctl_jiffies,
3914                 },
3915                 {
3916                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3917                         .procname       =       "force_mld_version",
3918                         .data           =       &ipv6_devconf.force_mld_version,
3919                         .maxlen         =       sizeof(int),
3920                         .mode           =       0644,
3921                         .proc_handler   =       &proc_dointvec,
3922                 },
3923 #ifdef CONFIG_IPV6_PRIVACY
3924                 {
3925                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3926                         .procname       =       "use_tempaddr",
3927                         .data           =       &ipv6_devconf.use_tempaddr,
3928                         .maxlen         =       sizeof(int),
3929                         .mode           =       0644,
3930                         .proc_handler   =       &proc_dointvec,
3931                 },
3932                 {
3933                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3934                         .procname       =       "temp_valid_lft",
3935                         .data           =       &ipv6_devconf.temp_valid_lft,
3936                         .maxlen         =       sizeof(int),
3937                         .mode           =       0644,
3938                         .proc_handler   =       &proc_dointvec,
3939                 },
3940                 {
3941                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3942                         .procname       =       "temp_prefered_lft",
3943                         .data           =       &ipv6_devconf.temp_prefered_lft,
3944                         .maxlen         =       sizeof(int),
3945                         .mode           =       0644,
3946                         .proc_handler   =       &proc_dointvec,
3947                 },
3948                 {
3949                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3950                         .procname       =       "regen_max_retry",
3951                         .data           =       &ipv6_devconf.regen_max_retry,
3952                         .maxlen         =       sizeof(int),
3953                         .mode           =       0644,
3954                         .proc_handler   =       &proc_dointvec,
3955                 },
3956                 {
3957                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3958                         .procname       =       "max_desync_factor",
3959                         .data           =       &ipv6_devconf.max_desync_factor,
3960                         .maxlen         =       sizeof(int),
3961                         .mode           =       0644,
3962                         .proc_handler   =       &proc_dointvec,
3963                 },
3964 #endif
3965                 {
3966                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3967                         .procname       =       "max_addresses",
3968                         .data           =       &ipv6_devconf.max_addresses,
3969                         .maxlen         =       sizeof(int),
3970                         .mode           =       0644,
3971                         .proc_handler   =       &proc_dointvec,
3972                 },
3973                 {
3974                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3975                         .procname       =       "accept_ra_defrtr",
3976                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3977                         .maxlen         =       sizeof(int),
3978                         .mode           =       0644,
3979                         .proc_handler   =       &proc_dointvec,
3980                 },
3981                 {
3982                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3983                         .procname       =       "accept_ra_pinfo",
3984                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3985                         .maxlen         =       sizeof(int),
3986                         .mode           =       0644,
3987                         .proc_handler   =       &proc_dointvec,
3988                 },
3989 #ifdef CONFIG_IPV6_ROUTER_PREF
3990                 {
3991                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3992                         .procname       =       "accept_ra_rtr_pref",
3993                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3994                         .maxlen         =       sizeof(int),
3995                         .mode           =       0644,
3996                         .proc_handler   =       &proc_dointvec,
3997                 },
3998                 {
3999                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4000                         .procname       =       "router_probe_interval",
4001                         .data           =       &ipv6_devconf.rtr_probe_interval,
4002                         .maxlen         =       sizeof(int),
4003                         .mode           =       0644,
4004                         .proc_handler   =       &proc_dointvec_jiffies,
4005                         .strategy       =       &sysctl_jiffies,
4006                 },
4007 #ifdef CONFIG_IPV6_ROUTE_INFO
4008                 {
4009                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4010                         .procname       =       "accept_ra_rt_info_max_plen",
4011                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4012                         .maxlen         =       sizeof(int),
4013                         .mode           =       0644,
4014                         .proc_handler   =       &proc_dointvec,
4015                 },
4016 #endif
4017 #endif
4018                 {
4019                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4020                         .procname       =       "proxy_ndp",
4021                         .data           =       &ipv6_devconf.proxy_ndp,
4022                         .maxlen         =       sizeof(int),
4023                         .mode           =       0644,
4024                         .proc_handler   =       &proc_dointvec,
4025                 },
4026                 {
4027                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4028                         .procname       =       "accept_source_route",
4029                         .data           =       &ipv6_devconf.accept_source_route,
4030                         .maxlen         =       sizeof(int),
4031                         .mode           =       0644,
4032                         .proc_handler   =       &proc_dointvec,
4033                 },
4034 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4035                 {
4036                         .ctl_name       =       CTL_UNNUMBERED,
4037                         .procname       =       "optimistic_dad",
4038                         .data           =       &ipv6_devconf.optimistic_dad,
4039                         .maxlen         =       sizeof(int),
4040                         .mode           =       0644,
4041                         .proc_handler   =       &proc_dointvec,
4042
4043                 },
4044 #endif
4045                 {
4046                         .ctl_name       =       0,      /* sentinel */
4047                 }
4048         },
4049 };
4050
4051 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4052                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4053 {
4054         int i;
4055         struct addrconf_sysctl_table *t;
4056
4057 #define ADDRCONF_CTL_PATH_DEV   3
4058
4059         struct ctl_path addrconf_ctl_path[] = {
4060                 { .procname = "net", .ctl_name = CTL_NET, },
4061                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4062                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4063                 { /* to be set */ },
4064                 { },
4065         };
4066
4067
4068         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4069         if (t == NULL)
4070                 goto out;
4071
4072         for (i=0; t->addrconf_vars[i].data; i++) {
4073                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4074                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4075                 t->addrconf_vars[i].extra2 = net;
4076         }
4077
4078         /*
4079          * Make a copy of dev_name, because '.procname' is regarded as const
4080          * by sysctl and we wouldn't want anyone to change it under our feet
4081          * (see SIOCSIFNAME).
4082          */
4083         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4084         if (!t->dev_name)
4085                 goto free;
4086
4087         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4088         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4089
4090         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4091                         t->addrconf_vars);
4092         if (t->sysctl_header == NULL)
4093                 goto free_procname;
4094
4095         p->sysctl = t;
4096         return 0;
4097
4098 free_procname:
4099         kfree(t->dev_name);
4100 free:
4101         kfree(t);
4102 out:
4103         return -ENOBUFS;
4104 }
4105
4106 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4107 {
4108         struct addrconf_sysctl_table *t;
4109
4110         if (p->sysctl == NULL)
4111                 return;
4112
4113         t = p->sysctl;
4114         p->sysctl = NULL;
4115         unregister_sysctl_table(t->sysctl_header);
4116         kfree(t->dev_name);
4117         kfree(t);
4118 }
4119
4120 static void addrconf_sysctl_register(struct inet6_dev *idev)
4121 {
4122         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4123                               NET_IPV6_NEIGH, "ipv6",
4124                               &ndisc_ifinfo_sysctl_change,
4125                               NULL);
4126         __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4127                         idev->dev->ifindex, idev, &idev->cnf);
4128 }
4129
4130 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4131 {
4132         __addrconf_sysctl_unregister(&idev->cnf);
4133         neigh_sysctl_unregister(idev->nd_parms);
4134 }
4135
4136
4137 #endif
4138
4139 static int addrconf_init_net(struct net *net)
4140 {
4141         int err;
4142         struct ipv6_devconf *all, *dflt;
4143
4144         err = -ENOMEM;
4145         all = &ipv6_devconf;
4146         dflt = &ipv6_devconf_dflt;
4147
4148         if (net != &init_net) {
4149                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4150                 if (all == NULL)
4151                         goto err_alloc_all;
4152
4153                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4154                 if (dflt == NULL)
4155                         goto err_alloc_dflt;
4156         }
4157
4158         net->ipv6.devconf_all = all;
4159         net->ipv6.devconf_dflt = dflt;
4160
4161 #ifdef CONFIG_SYSCTL
4162         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4163                         NULL, all);
4164         if (err < 0)
4165                 goto err_reg_all;
4166
4167         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4168                         NULL, dflt);
4169         if (err < 0)
4170                 goto err_reg_dflt;
4171 #endif
4172         return 0;
4173
4174 #ifdef CONFIG_SYSCTL
4175 err_reg_dflt:
4176         __addrconf_sysctl_unregister(all);
4177 err_reg_all:
4178         kfree(dflt);
4179 #endif
4180 err_alloc_dflt:
4181         kfree(all);
4182 err_alloc_all:
4183         return err;
4184 }
4185
4186 static void addrconf_exit_net(struct net *net)
4187 {
4188 #ifdef CONFIG_SYSCTL
4189         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4190         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4191 #endif
4192         if (net != &init_net) {
4193                 kfree(net->ipv6.devconf_dflt);
4194                 kfree(net->ipv6.devconf_all);
4195         }
4196 }
4197
4198 static struct pernet_operations addrconf_ops = {
4199         .init = addrconf_init_net,
4200         .exit = addrconf_exit_net,
4201 };
4202
4203 /*
4204  *      Device notifier
4205  */
4206
4207 int register_inet6addr_notifier(struct notifier_block *nb)
4208 {
4209         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4210 }
4211
4212 EXPORT_SYMBOL(register_inet6addr_notifier);
4213
4214 int unregister_inet6addr_notifier(struct notifier_block *nb)
4215 {
4216         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4217 }
4218
4219 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4220
4221 /*
4222  *      Init / cleanup code
4223  */
4224
4225 int __init addrconf_init(void)
4226 {
4227         int err;
4228
4229         if ((err = ipv6_addr_label_init()) < 0) {
4230                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4231                         err);
4232                 return err;
4233         }
4234
4235         register_pernet_subsys(&addrconf_ops);
4236
4237         /* The addrconf netdev notifier requires that loopback_dev
4238          * has it's ipv6 private information allocated and setup
4239          * before it can bring up and give link-local addresses
4240          * to other devices which are up.
4241          *
4242          * Unfortunately, loopback_dev is not necessarily the first
4243          * entry in the global dev_base list of net devices.  In fact,
4244          * it is likely to be the very last entry on that list.
4245          * So this causes the notifier registry below to try and
4246          * give link-local addresses to all devices besides loopback_dev
4247          * first, then loopback_dev, which cases all the non-loopback_dev
4248          * devices to fail to get a link-local address.
4249          *
4250          * So, as a temporary fix, allocate the ipv6 structure for
4251          * loopback_dev first by hand.
4252          * Longer term, all of the dependencies ipv6 has upon the loopback
4253          * device and it being up should be removed.
4254          */
4255         rtnl_lock();
4256         if (!ipv6_add_dev(init_net.loopback_dev))
4257                 err = -ENOMEM;
4258         rtnl_unlock();
4259         if (err)
4260                 goto errlo;
4261
4262         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4263         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4264 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4265         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4266         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4267         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4268         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4269 #endif
4270
4271         register_netdevice_notifier(&ipv6_dev_notf);
4272
4273         addrconf_verify(0);
4274
4275         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4276         if (err < 0)
4277                 goto errout;
4278
4279         /* Only the first call to __rtnl_register can fail */
4280         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4281         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4282         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4283         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4284         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4285
4286         ipv6_addr_label_rtnl_register();
4287
4288         return 0;
4289 errout:
4290         unregister_netdevice_notifier(&ipv6_dev_notf);
4291 errlo:
4292         unregister_pernet_subsys(&addrconf_ops);
4293
4294         return err;
4295 }
4296
4297 void addrconf_cleanup(void)
4298 {
4299         struct net_device *dev;
4300         struct inet6_ifaddr *ifa;
4301         int i;
4302
4303         unregister_netdevice_notifier(&ipv6_dev_notf);
4304
4305         unregister_pernet_subsys(&addrconf_ops);
4306
4307         rtnl_lock();
4308
4309         /*
4310          *      clean dev list.
4311          */
4312
4313         for_each_netdev(&init_net, dev) {
4314                 if (__in6_dev_get(dev) == NULL)
4315                         continue;
4316                 addrconf_ifdown(dev, 1);
4317         }
4318         addrconf_ifdown(init_net.loopback_dev, 2);
4319
4320         /*
4321          *      Check hash table.
4322          */
4323
4324         write_lock_bh(&addrconf_hash_lock);
4325         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4326                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4327                         struct inet6_ifaddr *bifa;
4328
4329                         bifa = ifa;
4330                         ifa = ifa->lst_next;
4331                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4332                         /* Do not free it; something is wrong.
4333                            Now we can investigate it with debugger.
4334                          */
4335                 }
4336         }
4337         write_unlock_bh(&addrconf_hash_lock);
4338
4339         del_timer(&addr_chk_timer);
4340
4341         rtnl_unlock();
4342 }