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(struct net *net, const struct in6_addr *addr,
 153                               struct net_device *dev);
 154
 155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 156
 157 struct ipv6_devconf ipv6_devconf __read_mostly = {
 158         .forwarding             = 0,
 159         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 160         .mtu6                   = IPV6_MIN_MTU,
 161         .accept_ra              = 1,
 162         .accept_redirects       = 1,
 163         .autoconf               = 1,
 164         .force_mld_version      = 0,
 165         .dad_transmits          = 1,
 166         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 167         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 168         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 169 #ifdef CONFIG_IPV6_PRIVACY
 170         .use_tempaddr           = 0,
 171         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 172         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 173         .regen_max_retry        = REGEN_MAX_RETRY,
 174         .max_desync_factor      = MAX_DESYNC_FACTOR,
 175 #endif
 176         .max_addresses          = IPV6_MAX_ADDRESSES,
 177         .accept_ra_defrtr       = 1,
 178         .accept_ra_pinfo        = 1,
 179 #ifdef CONFIG_IPV6_ROUTER_PREF
 180         .accept_ra_rtr_pref     = 1,
 181         .rtr_probe_interval     = 60 * HZ,
 182 #ifdef CONFIG_IPV6_ROUTE_INFO
 183         .accept_ra_rt_info_max_plen = 0,
 184 #endif
 185 #endif
 186         .proxy_ndp              = 0,
 187         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 188 };
 189
 190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 191         .forwarding             = 0,
 192         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 193         .mtu6                   = IPV6_MIN_MTU,
 194         .accept_ra              = 1,
 195         .accept_redirects       = 1,
 196         .autoconf               = 1,
 197         .dad_transmits          = 1,
 198         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 199         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 200         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 201 #ifdef CONFIG_IPV6_PRIVACY
 202         .use_tempaddr           = 0,
 203         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 204         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 205         .regen_max_retry        = REGEN_MAX_RETRY,
 206         .max_desync_factor      = MAX_DESYNC_FACTOR,
 207 #endif
 208         .max_addresses          = IPV6_MAX_ADDRESSES,
 209         .accept_ra_defrtr       = 1,
 210         .accept_ra_pinfo        = 1,
 211 #ifdef CONFIG_IPV6_ROUTER_PREF
 212         .accept_ra_rtr_pref     = 1,
 213         .rtr_probe_interval     = 60 * HZ,
 214 #ifdef CONFIG_IPV6_ROUTE_INFO
 215         .accept_ra_rt_info_max_plen = 0,
 216 #endif
 217 #endif
 218         .proxy_ndp              = 0,
 219         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 220 };
 221
 222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 225
 226 /* Check if a valid qdisc is available */
 227 static inline int addrconf_qdisc_ok(struct net_device *dev)
 228 {
 229         return (dev->qdisc != &noop_qdisc);
 230 }
 231
 232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 233 {
 234         if (del_timer(&ifp->timer))
 235                 __in6_ifa_put(ifp);
 236 }
 237
 238 enum addrconf_timer_t
 239 {
 240         AC_NONE,
 241         AC_DAD,
 242         AC_RS,
 243 };
 244
 245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 246                                enum addrconf_timer_t what,
 247                                unsigned long when)
 248 {
 249         if (!del_timer(&ifp->timer))
 250                 in6_ifa_hold(ifp);
 251
 252         switch (what) {
 253         case AC_DAD:
 254                 ifp->timer.function = addrconf_dad_timer;
 255                 break;
 256         case AC_RS:
 257                 ifp->timer.function = addrconf_rs_timer;
 258                 break;
 259         default:;
 260         }
 261         ifp->timer.expires = jiffies + when;
 262         add_timer(&ifp->timer);
 263 }
 264
 265 static int snmp6_alloc_dev(struct inet6_dev *idev)
 266 {
 267         if (snmp_mib_init((void **)idev->stats.ipv6,
 268                           sizeof(struct ipstats_mib)) < 0)
 269                 goto err_ip;
 270         if (snmp_mib_init((void **)idev->stats.icmpv6,
 271                           sizeof(struct icmpv6_mib)) < 0)
 272                 goto err_icmp;
 273         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 274                           sizeof(struct icmpv6msg_mib)) < 0)
 275                 goto err_icmpmsg;
 276
 277         return 0;
 278
 279 err_icmpmsg:
 280         snmp_mib_free((void **)idev->stats.icmpv6);
 281 err_icmp:
 282         snmp_mib_free((void **)idev->stats.ipv6);
 283 err_ip:
 284         return -ENOMEM;
 285 }
 286
 287 static void snmp6_free_dev(struct inet6_dev *idev)
 288 {
 289         snmp_mib_free((void **)idev->stats.icmpv6msg);
 290         snmp_mib_free((void **)idev->stats.icmpv6);
 291         snmp_mib_free((void **)idev->stats.ipv6);
 292 }
 293
 294 /* Nobody refers to this device, we may destroy it. */
 295
 296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 297 {
 298         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 299         kfree(idev);
 300 }
 301
 302 void in6_dev_finish_destroy(struct inet6_dev *idev)
 303 {
 304         struct net_device *dev = idev->dev;
 305         BUG_TRAP(idev->addr_list==NULL);
 306         BUG_TRAP(idev->mc_list==NULL);
 307 #ifdef NET_REFCNT_DEBUG
 308         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 309 #endif
 310         dev_put(dev);
 311         if (!idev->dead) {
 312                 printk("Freeing alive inet6 device %p\n", idev);
 313                 return;
 314         }
 315         snmp6_free_dev(idev);
 316         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 317 }
 318
 319 EXPORT_SYMBOL(in6_dev_finish_destroy);
 320
 321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 322 {
 323         struct inet6_dev *ndev;
 324         struct in6_addr maddr;
 325
 326         ASSERT_RTNL();
 327
 328         if (dev->mtu < IPV6_MIN_MTU)
 329                 return NULL;
 330
 331         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 332
 333         if (ndev == NULL)
 334                 return NULL;
 335
 336         rwlock_init(&ndev->lock);
 337         ndev->dev = dev;
 338         memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
 339         ndev->cnf.mtu6 = dev->mtu;
 340         ndev->cnf.sysctl = NULL;
 341         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 342         if (ndev->nd_parms == NULL) {
 343                 kfree(ndev);
 344                 return NULL;
 345         }
 346         /* We refer to the device */
 347         dev_hold(dev);
 348
 349         if (snmp6_alloc_dev(ndev) < 0) {
 350                 ADBG((KERN_WARNING
 351                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 352                         __FUNCTION__, dev->name));
 353                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 354                 ndev->dead = 1;
 355                 in6_dev_finish_destroy(ndev);
 356                 return NULL;
 357         }
 358
 359         if (snmp6_register_dev(ndev) < 0) {
 360                 ADBG((KERN_WARNING
 361                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 362                         __FUNCTION__, dev->name));
 363                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 364                 ndev->dead = 1;
 365                 in6_dev_finish_destroy(ndev);
 366                 return NULL;
 367         }
 368
 369         /* One reference from device.  We must do this before
 370          * we invoke __ipv6_regen_rndid().
 371          */
 372         in6_dev_hold(ndev);
 373
 374 #ifdef CONFIG_IPV6_PRIVACY
 375         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 376         if ((dev->flags&IFF_LOOPBACK) ||
 377             dev->type == ARPHRD_TUNNEL ||
 378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 379             dev->type == ARPHRD_SIT ||
 380 #endif
 381             dev->type == ARPHRD_NONE) {
 382                 printk(KERN_INFO
 383                        "%s: Disabled Privacy Extensions\n",
 384                        dev->name);
 385                 ndev->cnf.use_tempaddr = -1;
 386
 387                 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 388                         printk(KERN_INFO
 389                                "%s: Disabled Multicast RS\n",
 390                                dev->name);
 391                         ndev->cnf.rtr_solicits = 0;
 392                 }
 393         } else {
 394                 in6_dev_hold(ndev);
 395                 ipv6_regen_rndid((unsigned long) ndev);
 396         }
 397 #endif
 398
 399         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 400                 ndev->if_flags |= IF_READY;
 401
 402         ipv6_mc_init_dev(ndev);
 403         ndev->tstamp = jiffies;
 404         addrconf_sysctl_register(ndev);
 405         /* protected by rtnl_lock */
 406         rcu_assign_pointer(dev->ip6_ptr, ndev);
 407
 408         /* Join all-node multicast group */
 409         ipv6_addr_all_nodes(&maddr);
 410         ipv6_dev_mc_inc(dev, &maddr);
 411
 412         return ndev;
 413 }
 414
 415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 416 {
 417         struct inet6_dev *idev;
 418
 419         ASSERT_RTNL();
 420
 421         if ((idev = __in6_dev_get(dev)) == NULL) {
 422                 if ((idev = ipv6_add_dev(dev)) == NULL)
 423                         return NULL;
 424         }
 425
 426         if (dev->flags&IFF_UP)
 427                 ipv6_mc_up(idev);
 428         return idev;
 429 }
 430
 431 #ifdef CONFIG_SYSCTL
 432 static void dev_forward_change(struct inet6_dev *idev)
 433 {
 434         struct net_device *dev;
 435         struct inet6_ifaddr *ifa;
 436         struct in6_addr addr;
 437
 438         if (!idev)
 439                 return;
 440         dev = idev->dev;
 441         if (dev && (dev->flags & IFF_MULTICAST)) {
 442                 ipv6_addr_all_routers(&addr);
 443
 444                 if (idev->cnf.forwarding)
 445                         ipv6_dev_mc_inc(dev, &addr);
 446                 else
 447                         ipv6_dev_mc_dec(dev, &addr);
 448         }
 449         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 450                 if (ifa->flags&IFA_F_TENTATIVE)
 451                         continue;
 452                 if (idev->cnf.forwarding)
 453                         addrconf_join_anycast(ifa);
 454                 else
 455                         addrconf_leave_anycast(ifa);
 456         }
 457 }
 458
 459
 460 static void addrconf_forward_change(struct net *net, __s32 newf)
 461 {
 462         struct net_device *dev;
 463         struct inet6_dev *idev;
 464
 465         read_lock(&dev_base_lock);
 466         for_each_netdev(net, dev) {
 467                 rcu_read_lock();
 468                 idev = __in6_dev_get(dev);
 469                 if (idev) {
 470                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 471                         idev->cnf.forwarding = newf;
 472                         if (changed)
 473                                 dev_forward_change(idev);
 474                 }
 475                 rcu_read_unlock();
 476         }
 477         read_unlock(&dev_base_lock);
 478 }
 479
 480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 481 {
 482         struct net *net;
 483
 484         net = (struct net *)table->extra2;
 485         if (p == &net->ipv6.devconf_dflt->forwarding)
 486                 return;
 487
 488         if (p == &net->ipv6.devconf_all->forwarding) {
 489                 __s32 newf = net->ipv6.devconf_all->forwarding;
 490                 net->ipv6.devconf_dflt->forwarding = newf;
 491                 addrconf_forward_change(net, newf);
 492         } else if ((!*p) ^ (!old))
 493                 dev_forward_change((struct inet6_dev *)table->extra1);
 494
 495         if (*p)
 496                 rt6_purge_dflt_routers();
 497 }
 498 #endif
 499
 500 /* Nobody refers to this ifaddr, destroy it */
 501
 502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 503 {
 504         BUG_TRAP(ifp->if_next==NULL);
 505         BUG_TRAP(ifp->lst_next==NULL);
 506 #ifdef NET_REFCNT_DEBUG
 507         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 508 #endif
 509
 510         in6_dev_put(ifp->idev);
 511
 512         if (del_timer(&ifp->timer))
 513                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 514
 515         if (!ifp->dead) {
 516                 printk("Freeing alive inet6 address %p\n", ifp);
 517                 return;
 518         }
 519         dst_release(&ifp->rt->u.dst);
 520
 521         kfree(ifp);
 522 }
 523
 524 static void
 525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 526 {
 527         struct inet6_ifaddr *ifa, **ifap;
 528         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 529
 530         /*
 531          * Each device address list is sorted in order of scope -
 532          * global before linklocal.
 533          */
 534         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 535              ifap = &ifa->if_next) {
 536                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 537                         break;
 538         }
 539
 540         ifp->if_next = *ifap;
 541         *ifap = ifp;
 542 }
 543
 544 /* On success it returns ifp with increased reference count */
 545
 546 static struct inet6_ifaddr *
 547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 548               int scope, u32 flags)
 549 {
 550         struct inet6_ifaddr *ifa = NULL;
 551         struct rt6_info *rt;
 552         int hash;
 553         int err = 0;
 554
 555         rcu_read_lock_bh();
 556         if (idev->dead) {
 557                 err = -ENODEV;                  /*XXX*/
 558                 goto out2;
 559         }
 560
 561         write_lock(&addrconf_hash_lock);
 562
 563         /* Ignore adding duplicate addresses on an interface */
 564         if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
 565                 ADBG(("ipv6_add_addr: already assigned\n"));
 566                 err = -EEXIST;
 567                 goto out;
 568         }
 569
 570         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 571
 572         if (ifa == NULL) {
 573                 ADBG(("ipv6_add_addr: malloc failed\n"));
 574                 err = -ENOBUFS;
 575                 goto out;
 576         }
 577
 578         rt = addrconf_dst_alloc(idev, addr, 0);
 579         if (IS_ERR(rt)) {
 580                 err = PTR_ERR(rt);
 581                 goto out;
 582         }
 583
 584         ipv6_addr_copy(&ifa->addr, addr);
 585
 586         spin_lock_init(&ifa->lock);
 587         init_timer(&ifa->timer);
 588         ifa->timer.data = (unsigned long) ifa;
 589         ifa->scope = scope;
 590         ifa->prefix_len = pfxlen;
 591         ifa->flags = flags | IFA_F_TENTATIVE;
 592         ifa->cstamp = ifa->tstamp = jiffies;
 593
 594         ifa->rt = rt;
 595
 596         /*
 597          * part one of RFC 4429, section 3.3
 598          * We should not configure an address as
 599          * optimistic if we do not yet know the link
 600          * layer address of our nexhop router
 601          */
 602
 603         if (rt->rt6i_nexthop == NULL)
 604                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 605
 606         ifa->idev = idev;
 607         in6_dev_hold(idev);
 608         /* For caller */
 609         in6_ifa_hold(ifa);
 610
 611         /* Add to big hash table */
 612         hash = ipv6_addr_hash(addr);
 613
 614         ifa->lst_next = inet6_addr_lst[hash];
 615         inet6_addr_lst[hash] = ifa;
 616         in6_ifa_hold(ifa);
 617         write_unlock(&addrconf_hash_lock);
 618
 619         write_lock(&idev->lock);
 620         /* Add to inet6_dev unicast addr list. */
 621         ipv6_link_dev_addr(idev, ifa);
 622
 623 #ifdef CONFIG_IPV6_PRIVACY
 624         if (ifa->flags&IFA_F_TEMPORARY) {
 625                 ifa->tmp_next = idev->tempaddr_list;
 626                 idev->tempaddr_list = ifa;
 627                 in6_ifa_hold(ifa);
 628         }
 629 #endif
 630
 631         in6_ifa_hold(ifa);
 632         write_unlock(&idev->lock);
 633 out2:
 634         rcu_read_unlock_bh();
 635
 636         if (likely(err == 0))
 637                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 638         else {
 639                 kfree(ifa);
 640                 ifa = ERR_PTR(err);
 641         }
 642
 643         return ifa;
 644 out:
 645         write_unlock(&addrconf_hash_lock);
 646         goto out2;
 647 }
 648
 649 /* This function wants to get referenced ifp and releases it before return */
 650
 651 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 652 {
 653         struct inet6_ifaddr *ifa, **ifap;
 654         struct inet6_dev *idev = ifp->idev;
 655         int hash;
 656         int deleted = 0, onlink = 0;
 657         unsigned long expires = jiffies;
 658
 659         hash = ipv6_addr_hash(&ifp->addr);
 660
 661         ifp->dead = 1;
 662
 663         write_lock_bh(&addrconf_hash_lock);
 664         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 665              ifap = &ifa->lst_next) {
 666                 if (ifa == ifp) {
 667                         *ifap = ifa->lst_next;
 668                         __in6_ifa_put(ifp);
 669                         ifa->lst_next = NULL;
 670                         break;
 671                 }
 672         }
 673         write_unlock_bh(&addrconf_hash_lock);
 674
 675         write_lock_bh(&idev->lock);
 676 #ifdef CONFIG_IPV6_PRIVACY
 677         if (ifp->flags&IFA_F_TEMPORARY) {
 678                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 679                      ifap = &ifa->tmp_next) {
 680                         if (ifa == ifp) {
 681                                 *ifap = ifa->tmp_next;
 682                                 if (ifp->ifpub) {
 683                                         in6_ifa_put(ifp->ifpub);
 684                                         ifp->ifpub = NULL;
 685                                 }
 686                                 __in6_ifa_put(ifp);
 687                                 ifa->tmp_next = NULL;
 688                                 break;
 689                         }
 690                 }
 691         }
 692 #endif
 693
 694         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 695                 if (ifa == ifp) {
 696                         *ifap = ifa->if_next;
 697                         __in6_ifa_put(ifp);
 698                         ifa->if_next = NULL;
 699                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 700                                 break;
 701                         deleted = 1;
 702                         continue;
 703                 } else if (ifp->flags & IFA_F_PERMANENT) {
 704                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 705                                               ifp->prefix_len)) {
 706                                 if (ifa->flags & IFA_F_PERMANENT) {
 707                                         onlink = 1;
 708                                         if (deleted)
 709                                                 break;
 710                                 } else {
 711                                         unsigned long lifetime;
 712
 713                                         if (!onlink)
 714                                                 onlink = -1;
 715
 716                                         spin_lock(&ifa->lock);
 717                                         lifetime = min_t(unsigned long,
 718                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 719                                         if (time_before(expires,
 720                                                         ifa->tstamp + lifetime * HZ))
 721                                                 expires = ifa->tstamp + lifetime * HZ;
 722                                         spin_unlock(&ifa->lock);
 723                                 }
 724                         }
 725                 }
 726                 ifap = &ifa->if_next;
 727         }
 728         write_unlock_bh(&idev->lock);
 729
 730         ipv6_ifa_notify(RTM_DELADDR, ifp);
 731
 732         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 733
 734         addrconf_del_timer(ifp);
 735
 736         /*
 737          * Purge or update corresponding prefix
 738          *
 739          * 1) we don't purge prefix here if address was not permanent.
 740          *    prefix is managed by its own lifetime.
 741          * 2) if there're no addresses, delete prefix.
 742          * 3) if there're still other permanent address(es),
 743          *    corresponding prefix is still permanent.
 744          * 4) otherwise, update prefix lifetime to the
 745          *    longest valid lifetime among the corresponding
 746          *    addresses on the device.
 747          *    Note: subsequent RA will update lifetime.
 748          *
 749          * --yoshfuji
 750          */
 751         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 752                 struct in6_addr prefix;
 753                 struct rt6_info *rt;
 754
 755                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 756                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 757
 758                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 759                         if (onlink == 0) {
 760                                 ip6_del_rt(rt);
 761                                 rt = NULL;
 762                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 763                                 rt->rt6i_expires = expires;
 764                                 rt->rt6i_flags |= RTF_EXPIRES;
 765                         }
 766                 }
 767                 dst_release(&rt->u.dst);
 768         }
 769
 770         in6_ifa_put(ifp);
 771 }
 772
 773 #ifdef CONFIG_IPV6_PRIVACY
 774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 775 {
 776         struct inet6_dev *idev = ifp->idev;
 777         struct in6_addr addr, *tmpaddr;
 778         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 779         int tmp_plen;
 780         int ret = 0;
 781         int max_addresses;
 782         u32 addr_flags;
 783
 784         write_lock(&idev->lock);
 785         if (ift) {
 786                 spin_lock_bh(&ift->lock);
 787                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 788                 spin_unlock_bh(&ift->lock);
 789                 tmpaddr = &addr;
 790         } else {
 791                 tmpaddr = NULL;
 792         }
 793 retry:
 794         in6_dev_hold(idev);
 795         if (idev->cnf.use_tempaddr <= 0) {
 796                 write_unlock(&idev->lock);
 797                 printk(KERN_INFO
 798                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 799                 in6_dev_put(idev);
 800                 ret = -1;
 801                 goto out;
 802         }
 803         spin_lock_bh(&ifp->lock);
 804         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 805                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 806                 spin_unlock_bh(&ifp->lock);
 807                 write_unlock(&idev->lock);
 808                 printk(KERN_WARNING
 809                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 810                 in6_dev_put(idev);
 811                 ret = -1;
 812                 goto out;
 813         }
 814         in6_ifa_hold(ifp);
 815         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 816         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 817                 spin_unlock_bh(&ifp->lock);
 818                 write_unlock(&idev->lock);
 819                 printk(KERN_WARNING
 820                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 821                 in6_ifa_put(ifp);
 822                 in6_dev_put(idev);
 823                 ret = -1;
 824                 goto out;
 825         }
 826         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 827         tmp_valid_lft = min_t(__u32,
 828                               ifp->valid_lft,
 829                               idev->cnf.temp_valid_lft);
 830         tmp_prefered_lft = min_t(__u32,
 831                                  ifp->prefered_lft,
 832                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 833         tmp_plen = ifp->prefix_len;
 834         max_addresses = idev->cnf.max_addresses;
 835         tmp_cstamp = ifp->cstamp;
 836         tmp_tstamp = ifp->tstamp;
 837         spin_unlock_bh(&ifp->lock);
 838
 839         write_unlock(&idev->lock);
 840
 841         addr_flags = IFA_F_TEMPORARY;
 842         /* set in addrconf_prefix_rcv() */
 843         if (ifp->flags & IFA_F_OPTIMISTIC)
 844                 addr_flags |= IFA_F_OPTIMISTIC;
 845
 846         ift = !max_addresses ||
 847               ipv6_count_addresses(idev) < max_addresses ?
 848                 ipv6_add_addr(idev, &addr, tmp_plen,
 849                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 850                               addr_flags) : NULL;
 851         if (!ift || IS_ERR(ift)) {
 852                 in6_ifa_put(ifp);
 853                 in6_dev_put(idev);
 854                 printk(KERN_INFO
 855                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 856                 tmpaddr = &addr;
 857                 write_lock(&idev->lock);
 858                 goto retry;
 859         }
 860
 861         spin_lock_bh(&ift->lock);
 862         ift->ifpub = ifp;
 863         ift->valid_lft = tmp_valid_lft;
 864         ift->prefered_lft = tmp_prefered_lft;
 865         ift->cstamp = tmp_cstamp;
 866         ift->tstamp = tmp_tstamp;
 867         spin_unlock_bh(&ift->lock);
 868
 869         addrconf_dad_start(ift, 0);
 870         in6_ifa_put(ift);
 871         in6_dev_put(idev);
 872 out:
 873         return ret;
 874 }
 875 #endif
 876
 877 /*
 878  *      Choose an appropriate source address (RFC3484)
 879  */
 880 struct ipv6_saddr_score {
 881         int             addr_type;
 882         unsigned int    attrs;
 883         int             matchlen;
 884         int             scope;
 885         unsigned int    rule;
 886 };
 887
 888 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 889 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 890 #define IPV6_SADDR_SCORE_HOA            0x0008
 891 #define IPV6_SADDR_SCORE_OIF            0x0010
 892 #define IPV6_SADDR_SCORE_LABEL          0x0020
 893 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 894
 895 static inline int ipv6_saddr_preferred(int type)
 896 {
 897         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 898                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 899                 return 1;
 900         return 0;
 901 }
 902
 903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 904                        struct in6_addr *daddr, struct in6_addr *saddr)
 905 {
 906         struct ipv6_saddr_score hiscore;
 907         struct inet6_ifaddr *ifa_result = NULL;
 908         int daddr_type = __ipv6_addr_type(daddr);
 909         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 910         int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
 911         u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
 912         struct net_device *dev;
 913
 914         memset(&hiscore, 0, sizeof(hiscore));
 915
 916         read_lock(&dev_base_lock);
 917         rcu_read_lock();
 918
 919         for_each_netdev(&init_net, dev) {
 920                 struct inet6_dev *idev;
 921                 struct inet6_ifaddr *ifa;
 922
 923                 /* Rule 0: Candidate Source Address (section 4)
 924                  *  - multicast and link-local destination address,
 925                  *    the set of candidate source address MUST only
 926                  *    include addresses assigned to interfaces
 927                  *    belonging to the same link as the outgoing
 928                  *    interface.
 929                  * (- For site-local destination addresses, the
 930                  *    set of candidate source addresses MUST only
 931                  *    include addresses assigned to interfaces
 932                  *    belonging to the same site as the outgoing
 933                  *    interface.)
 934                  */
 935                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 936                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 937                     daddr_dev && dev != daddr_dev)
 938                         continue;
 939
 940                 idev = __in6_dev_get(dev);
 941                 if (!idev)
 942                         continue;
 943
 944                 read_lock_bh(&idev->lock);
 945                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 946                         struct ipv6_saddr_score score;
 947
 948                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 949
 950                         /* Rule 0:
 951                          * - Tentative Address (RFC2462 section 5.4)
 952                          *  - A tentative address is not considered
 953                          *    "assigned to an interface" in the traditional
 954                          *    sense, unless it is also flagged as optimistic.
 955                          * - Candidate Source Address (section 4)
 956                          *  - In any case, anycast addresses, multicast
 957                          *    addresses, and the unspecified address MUST
 958                          *    NOT be included in a candidate set.
 959                          */
 960                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 961                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 962                                 continue;
 963                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 964                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 965                                 LIMIT_NETDEBUG(KERN_DEBUG
 966                                                "ADDRCONF: unspecified / multicast address "
 967                                                "assigned as unicast address on %s",
 968                                                dev->name);
 969                                 continue;
 970                         }
 971
 972                         score.attrs = 0;
 973                         score.matchlen = 0;
 974                         score.scope = 0;
 975                         score.rule = 0;
 976
 977                         if (ifa_result == NULL) {
 978                                 /* record it if the first available entry */
 979                                 goto record_it;
 980                         }
 981
 982                         /* Rule 1: Prefer same address */
 983                         if (hiscore.rule < 1) {
 984                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 985                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 986                                 hiscore.rule++;
 987                         }
 988                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 989                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 990                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 991                                         score.rule = 1;
 992                                         goto record_it;
 993                                 }
 994                         } else {
 995                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 996                                         continue;
 997                         }
 998
 999                         /* Rule 2: Prefer appropriate scope */
1000                         if (hiscore.rule < 2) {
1001                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1002                                 hiscore.rule++;
1003                         }
1004                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1005                         if (hiscore.scope < score.scope) {
1006                                 if (hiscore.scope < daddr_scope) {
1007                                         score.rule = 2;
1008                                         goto record_it;
1009                                 } else
1010                                         continue;
1011                         } else if (score.scope < hiscore.scope) {
1012                                 if (score.scope < daddr_scope)
1013                                         break; /* addresses sorted by scope */
1014                                 else {
1015                                         score.rule = 2;
1016                                         goto record_it;
1017                                 }
1018                         }
1019
1020                         /* Rule 3: Avoid deprecated and optimistic addresses */
1021                         if (hiscore.rule < 3) {
1022                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1023                                    (((ifa_result->flags &
1024                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1025                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1026                                 hiscore.rule++;
1027                         }
1028                         if (ipv6_saddr_preferred(score.addr_type) ||
1029                            (((ifa->flags &
1030                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1031                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1033                                         score.rule = 3;
1034                                         goto record_it;
1035                                 }
1036                         } else {
1037                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1038                                         continue;
1039                         }
1040
1041                         /* Rule 4: Prefer home address */
1042 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1043                         if (hiscore.rule < 4) {
1044                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1045                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1046                                 hiscore.rule++;
1047                         }
1048                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1049                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1050                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1051                                         score.rule = 4;
1052                                         goto record_it;
1053                                 }
1054                         } else {
1055                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1056                                         continue;
1057                         }
1058 #else
1059                         if (hiscore.rule < 4)
1060                                 hiscore.rule++;
1061 #endif
1062
1063                         /* Rule 5: Prefer outgoing interface */
1064                         if (hiscore.rule < 5) {
1065                                 if (daddr_dev == NULL ||
1066                                     daddr_dev == ifa_result->idev->dev)
1067                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1068                                 hiscore.rule++;
1069                         }
1070                         if (daddr_dev == NULL ||
1071                             daddr_dev == ifa->idev->dev) {
1072                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1073                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1074                                         score.rule = 5;
1075                                         goto record_it;
1076                                 }
1077                         } else {
1078                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1079                                         continue;
1080                         }
1081
1082                         /* Rule 6: Prefer matching label */
1083                         if (hiscore.rule < 6) {
1084                                 if (ipv6_addr_label(&ifa_result->addr,
1085                                                     hiscore.addr_type,
1086                                                     ifa_result->idev->dev->ifindex) == daddr_label)
1087                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1088                                 hiscore.rule++;
1089                         }
1090                         if (ipv6_addr_label(&ifa->addr,
1091                                             score.addr_type,
1092                                             ifa->idev->dev->ifindex) == daddr_label) {
1093                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095                                         score.rule = 6;
1096                                         goto record_it;
1097                                 }
1098                         } else {
1099                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100                                         continue;
1101                         }
1102
1103 #ifdef CONFIG_IPV6_PRIVACY
1104                         /* Rule 7: Prefer public address
1105                          * Note: prefer temprary address if use_tempaddr >= 2
1106                          */
1107                         if (hiscore.rule < 7) {
1108                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1110                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111                                 hiscore.rule++;
1112                         }
1113                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1115                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117                                         score.rule = 7;
1118                                         goto record_it;
1119                                 }
1120                         } else {
1121                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122                                         continue;
1123                         }
1124 #else
1125                         if (hiscore.rule < 7)
1126                                 hiscore.rule++;
1127 #endif
1128                         /* Rule 8: Use longest matching prefix */
1129                         if (hiscore.rule < 8) {
1130                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1131                                 hiscore.rule++;
1132                         }
1133                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134                         if (score.matchlen > hiscore.matchlen) {
1135                                 score.rule = 8;
1136                                 goto record_it;
1137                         }
1138 #if 0
1139                         else if (score.matchlen < hiscore.matchlen)
1140                                 continue;
1141 #endif
1142
1143                         /* Final Rule: choose first available one */
1144                         continue;
1145 record_it:
1146                         if (ifa_result)
1147                                 in6_ifa_put(ifa_result);
1148                         in6_ifa_hold(ifa);
1149                         ifa_result = ifa;
1150                         hiscore = score;
1151                 }
1152                 read_unlock_bh(&idev->lock);
1153         }
1154         rcu_read_unlock();
1155         read_unlock(&dev_base_lock);
1156
1157         if (!ifa_result)
1158                 return -EADDRNOTAVAIL;
1159
1160         ipv6_addr_copy(saddr, &ifa_result->addr);
1161         in6_ifa_put(ifa_result);
1162         return 0;
1163 }
1164
1165
1166 int ipv6_get_saddr(struct dst_entry *dst,
1167                    struct in6_addr *daddr, struct in6_addr *saddr)
1168 {
1169         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1170 }
1171
1172 EXPORT_SYMBOL(ipv6_get_saddr);
1173
1174 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175                     unsigned char banned_flags)
1176 {
1177         struct inet6_dev *idev;
1178         int err = -EADDRNOTAVAIL;
1179
1180         rcu_read_lock();
1181         if ((idev = __in6_dev_get(dev)) != NULL) {
1182                 struct inet6_ifaddr *ifp;
1183
1184                 read_lock_bh(&idev->lock);
1185                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1186                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1187                                 ipv6_addr_copy(addr, &ifp->addr);
1188                                 err = 0;
1189                                 break;
1190                         }
1191                 }
1192                 read_unlock_bh(&idev->lock);
1193         }
1194         rcu_read_unlock();
1195         return err;
1196 }
1197
1198 static int ipv6_count_addresses(struct inet6_dev *idev)
1199 {
1200         int cnt = 0;
1201         struct inet6_ifaddr *ifp;
1202
1203         read_lock_bh(&idev->lock);
1204         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1205                 cnt++;
1206         read_unlock_bh(&idev->lock);
1207         return cnt;
1208 }
1209
1210 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1211                   struct net_device *dev, int strict)
1212 {
1213         struct inet6_ifaddr * ifp;
1214         u8 hash = ipv6_addr_hash(addr);
1215
1216         read_lock_bh(&addrconf_hash_lock);
1217         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1218                 if (ifp->idev->dev->nd_net != net)
1219                         continue;
1220                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1221                     !(ifp->flags&IFA_F_TENTATIVE)) {
1222                         if (dev == NULL || ifp->idev->dev == dev ||
1223                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1224                                 break;
1225                 }
1226         }
1227         read_unlock_bh(&addrconf_hash_lock);
1228         return ifp != NULL;
1229 }
1230 EXPORT_SYMBOL(ipv6_chk_addr);
1231
1232 static
1233 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1234                        struct net_device *dev)
1235 {
1236         struct inet6_ifaddr * ifp;
1237         u8 hash = ipv6_addr_hash(addr);
1238
1239         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1240                 if (ifp->idev->dev->nd_net != net)
1241                         continue;
1242                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1243                         if (dev == NULL || ifp->idev->dev == dev)
1244                                 break;
1245                 }
1246         }
1247         return ifp != NULL;
1248 }
1249
1250 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1251                                      struct net_device *dev, int strict)
1252 {
1253         struct inet6_ifaddr * ifp;
1254         u8 hash = ipv6_addr_hash(addr);
1255
1256         read_lock_bh(&addrconf_hash_lock);
1257         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1258                 if (ifp->idev->dev->nd_net != net)
1259                         continue;
1260                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261                         if (dev == NULL || ifp->idev->dev == dev ||
1262                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1263                                 in6_ifa_hold(ifp);
1264                                 break;
1265                         }
1266                 }
1267         }
1268         read_unlock_bh(&addrconf_hash_lock);
1269
1270         return ifp;
1271 }
1272
1273 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1274 {
1275         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1276         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1277         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1278         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1279         int sk_ipv6only = ipv6_only_sock(sk);
1280         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1281         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1282         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1283
1284         if (!sk2_rcv_saddr && !sk_ipv6only)
1285                 return 1;
1286
1287         if (addr_type2 == IPV6_ADDR_ANY &&
1288             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1289                 return 1;
1290
1291         if (addr_type == IPV6_ADDR_ANY &&
1292             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1293                 return 1;
1294
1295         if (sk2_rcv_saddr6 &&
1296             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1297                 return 1;
1298
1299         if (addr_type == IPV6_ADDR_MAPPED &&
1300             !sk2_ipv6only &&
1301             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1302                 return 1;
1303
1304         return 0;
1305 }
1306
1307 /* Gets referenced address, destroys ifaddr */
1308
1309 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1310 {
1311         if (ifp->flags&IFA_F_PERMANENT) {
1312                 spin_lock_bh(&ifp->lock);
1313                 addrconf_del_timer(ifp);
1314                 ifp->flags |= IFA_F_TENTATIVE;
1315                 spin_unlock_bh(&ifp->lock);
1316                 in6_ifa_put(ifp);
1317 #ifdef CONFIG_IPV6_PRIVACY
1318         } else if (ifp->flags&IFA_F_TEMPORARY) {
1319                 struct inet6_ifaddr *ifpub;
1320                 spin_lock_bh(&ifp->lock);
1321                 ifpub = ifp->ifpub;
1322                 if (ifpub) {
1323                         in6_ifa_hold(ifpub);
1324                         spin_unlock_bh(&ifp->lock);
1325                         ipv6_create_tempaddr(ifpub, ifp);
1326                         in6_ifa_put(ifpub);
1327                 } else {
1328                         spin_unlock_bh(&ifp->lock);
1329                 }
1330                 ipv6_del_addr(ifp);
1331 #endif
1332         } else
1333                 ipv6_del_addr(ifp);
1334 }
1335
1336 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1337 {
1338         if (net_ratelimit())
1339                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1340         addrconf_dad_stop(ifp);
1341 }
1342
1343 /* Join to solicited addr multicast group. */
1344
1345 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1346 {
1347         struct in6_addr maddr;
1348
1349         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1350                 return;
1351
1352         addrconf_addr_solict_mult(addr, &maddr);
1353         ipv6_dev_mc_inc(dev, &maddr);
1354 }
1355
1356 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1357 {
1358         struct in6_addr maddr;
1359
1360         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1361                 return;
1362
1363         addrconf_addr_solict_mult(addr, &maddr);
1364         __ipv6_dev_mc_dec(idev, &maddr);
1365 }
1366
1367 static void addrconf_join_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_inc(ifp->idev->dev, &addr);
1374 }
1375
1376 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1377 {
1378         struct in6_addr addr;
1379         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1380         if (ipv6_addr_any(&addr))
1381                 return;
1382         __ipv6_dev_ac_dec(ifp->idev, &addr);
1383 }
1384
1385 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1386 {
1387         if (dev->addr_len != ETH_ALEN)
1388                 return -1;
1389         memcpy(eui, dev->dev_addr, 3);
1390         memcpy(eui + 5, dev->dev_addr + 3, 3);
1391
1392         /*
1393          * The zSeries OSA network cards can be shared among various
1394          * OS instances, but the OSA cards have only one MAC address.
1395          * This leads to duplicate address conflicts in conjunction
1396          * with IPv6 if more than one instance uses the same card.
1397          *
1398          * The driver for these cards can deliver a unique 16-bit
1399          * identifier for each instance sharing the same card.  It is
1400          * placed instead of 0xFFFE in the interface identifier.  The
1401          * "u" bit of the interface identifier is not inverted in this
1402          * case.  Hence the resulting interface identifier has local
1403          * scope according to RFC2373.
1404          */
1405         if (dev->dev_id) {
1406                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1407                 eui[4] = dev->dev_id & 0xFF;
1408         } else {
1409                 eui[3] = 0xFF;
1410                 eui[4] = 0xFE;
1411                 eui[0] ^= 2;
1412         }
1413         return 0;
1414 }
1415
1416 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1417 {
1418         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1419         if (dev->addr_len != ARCNET_ALEN)
1420                 return -1;
1421         memset(eui, 0, 7);
1422         eui[7] = *(u8*)dev->dev_addr;
1423         return 0;
1424 }
1425
1426 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1427 {
1428         if (dev->addr_len != INFINIBAND_ALEN)
1429                 return -1;
1430         memcpy(eui, dev->dev_addr + 12, 8);
1431         eui[0] |= 2;
1432         return 0;
1433 }
1434
1435 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1436 {
1437         switch (dev->type) {
1438         case ARPHRD_ETHER:
1439         case ARPHRD_FDDI:
1440         case ARPHRD_IEEE802_TR:
1441                 return addrconf_ifid_eui48(eui, dev);
1442         case ARPHRD_ARCNET:
1443                 return addrconf_ifid_arcnet(eui, dev);
1444         case ARPHRD_INFINIBAND:
1445                 return addrconf_ifid_infiniband(eui, dev);
1446         case ARPHRD_SIT:
1447                 if (dev->priv_flags & IFF_ISATAP)
1448                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1449         }
1450         return -1;
1451 }
1452
1453 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1454 {
1455         int err = -1;
1456         struct inet6_ifaddr *ifp;
1457
1458         read_lock_bh(&idev->lock);
1459         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1460                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1461                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1462                         err = 0;
1463                         break;
1464                 }
1465         }
1466         read_unlock_bh(&idev->lock);
1467         return err;
1468 }
1469
1470 #ifdef CONFIG_IPV6_PRIVACY
1471 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1472 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1473 {
1474 regen:
1475         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1476         idev->rndid[0] &= ~0x02;
1477
1478         /*
1479          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1480          * check if generated address is not inappropriate
1481          *
1482          *  - Reserved subnet anycast (RFC 2526)
1483          *      11111101 11....11 1xxxxxxx
1484          *  - ISATAP (RFC4214) 6.1
1485          *      00-00-5E-FE-xx-xx-xx-xx
1486          *  - value 0
1487          *  - XXX: already assigned to an address on the device
1488          */
1489         if (idev->rndid[0] == 0xfd &&
1490             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1491             (idev->rndid[7]&0x80))
1492                 goto regen;
1493         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1494                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1495                         goto regen;
1496                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1497                         goto regen;
1498         }
1499
1500         return 0;
1501 }
1502
1503 static void ipv6_regen_rndid(unsigned long data)
1504 {
1505         struct inet6_dev *idev = (struct inet6_dev *) data;
1506         unsigned long expires;
1507
1508         rcu_read_lock_bh();
1509         write_lock_bh(&idev->lock);
1510
1511         if (idev->dead)
1512                 goto out;
1513
1514         if (__ipv6_regen_rndid(idev) < 0)
1515                 goto out;
1516
1517         expires = jiffies +
1518                 idev->cnf.temp_prefered_lft * HZ -
1519                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1520         if (time_before(expires, jiffies)) {
1521                 printk(KERN_WARNING
1522                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1523                         idev->dev->name);
1524                 goto out;
1525         }
1526
1527         if (!mod_timer(&idev->regen_timer, expires))
1528                 in6_dev_hold(idev);
1529
1530 out:
1531         write_unlock_bh(&idev->lock);
1532         rcu_read_unlock_bh();
1533         in6_dev_put(idev);
1534 }
1535
1536 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1537         int ret = 0;
1538
1539         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1540                 ret = __ipv6_regen_rndid(idev);
1541         return ret;
1542 }
1543 #endif
1544
1545 /*
1546  *      Add prefix route.
1547  */
1548
1549 static void
1550 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1551                       unsigned long expires, u32 flags)
1552 {
1553         struct fib6_config cfg = {
1554                 .fc_table = RT6_TABLE_PREFIX,
1555                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1556                 .fc_ifindex = dev->ifindex,
1557                 .fc_expires = expires,
1558                 .fc_dst_len = plen,
1559                 .fc_flags = RTF_UP | flags,
1560                 .fc_nlinfo.nl_net = &init_net,
1561         };
1562
1563         ipv6_addr_copy(&cfg.fc_dst, pfx);
1564
1565         /* Prevent useless cloning on PtP SIT.
1566            This thing is done here expecting that the whole
1567            class of non-broadcast devices need not cloning.
1568          */
1569 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1570         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1571                 cfg.fc_flags |= RTF_NONEXTHOP;
1572 #endif
1573
1574         ip6_route_add(&cfg);
1575 }
1576
1577 /* Create "default" multicast route to the interface */
1578
1579 static void addrconf_add_mroute(struct net_device *dev)
1580 {
1581         struct fib6_config cfg = {
1582                 .fc_table = RT6_TABLE_LOCAL,
1583                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1584                 .fc_ifindex = dev->ifindex,
1585                 .fc_dst_len = 8,
1586                 .fc_flags = RTF_UP,
1587                 .fc_nlinfo.nl_net = &init_net,
1588         };
1589
1590         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1591
1592         ip6_route_add(&cfg);
1593 }
1594
1595 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1596 static void sit_route_add(struct net_device *dev)
1597 {
1598         struct fib6_config cfg = {
1599                 .fc_table = RT6_TABLE_MAIN,
1600                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1601                 .fc_ifindex = dev->ifindex,
1602                 .fc_dst_len = 96,
1603                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1604                 .fc_nlinfo.nl_net = &init_net,
1605         };
1606
1607         /* prefix length - 96 bits "::d.d.d.d" */
1608         ip6_route_add(&cfg);
1609 }
1610 #endif
1611
1612 static void addrconf_add_lroute(struct net_device *dev)
1613 {
1614         struct in6_addr addr;
1615
1616         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1617         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1618 }
1619
1620 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1621 {
1622         struct inet6_dev *idev;
1623
1624         ASSERT_RTNL();
1625
1626         if ((idev = ipv6_find_idev(dev)) == NULL)
1627                 return NULL;
1628
1629         /* Add default multicast route */
1630         addrconf_add_mroute(dev);
1631
1632         /* Add link local route */
1633         addrconf_add_lroute(dev);
1634         return idev;
1635 }
1636
1637 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1638 {
1639         struct prefix_info *pinfo;
1640         __u32 valid_lft;
1641         __u32 prefered_lft;
1642         int addr_type;
1643         unsigned long rt_expires;
1644         struct inet6_dev *in6_dev;
1645
1646         pinfo = (struct prefix_info *) opt;
1647
1648         if (len < sizeof(struct prefix_info)) {
1649                 ADBG(("addrconf: prefix option too short\n"));
1650                 return;
1651         }
1652
1653         /*
1654          *      Validation checks ([ADDRCONF], page 19)
1655          */
1656
1657         addr_type = ipv6_addr_type(&pinfo->prefix);
1658
1659         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1660                 return;
1661
1662         valid_lft = ntohl(pinfo->valid);
1663         prefered_lft = ntohl(pinfo->prefered);
1664
1665         if (prefered_lft > valid_lft) {
1666                 if (net_ratelimit())
1667                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1668                 return;
1669         }
1670
1671         in6_dev = in6_dev_get(dev);
1672
1673         if (in6_dev == NULL) {
1674                 if (net_ratelimit())
1675                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1676                 return;
1677         }
1678
1679         /*
1680          *      Two things going on here:
1681          *      1) Add routes for on-link prefixes
1682          *      2) Configure prefixes with the auto flag set
1683          */
1684
1685         /* Avoid arithmetic overflow. Really, we could
1686            save rt_expires in seconds, likely valid_lft,
1687            but it would require division in fib gc, that it
1688            not good.
1689          */
1690         if (valid_lft >= 0x7FFFFFFF/HZ)
1691                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1692         else
1693                 rt_expires = valid_lft * HZ;
1694
1695         /*
1696          * We convert this (in jiffies) to clock_t later.
1697          * Avoid arithmetic overflow there as well.
1698          * Overflow can happen only if HZ < USER_HZ.
1699          */
1700         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1701                 rt_expires = 0x7FFFFFFF / USER_HZ;
1702
1703         if (pinfo->onlink) {
1704                 struct rt6_info *rt;
1705                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1706
1707                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1708                         if (rt->rt6i_flags&RTF_EXPIRES) {
1709                                 if (valid_lft == 0) {
1710                                         ip6_del_rt(rt);
1711                                         rt = NULL;
1712                                 } else {
1713                                         rt->rt6i_expires = jiffies + rt_expires;
1714                                 }
1715                         }
1716                 } else if (valid_lft) {
1717                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1718                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1719                 }
1720                 if (rt)
1721                         dst_release(&rt->u.dst);
1722         }
1723
1724         /* Try to figure out our local address for this prefix */
1725
1726         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1727                 struct inet6_ifaddr * ifp;
1728                 struct in6_addr addr;
1729                 int create = 0, update_lft = 0;
1730
1731                 if (pinfo->prefix_len == 64) {
1732                         memcpy(&addr, &pinfo->prefix, 8);
1733                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1734                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1735                                 in6_dev_put(in6_dev);
1736                                 return;
1737                         }
1738                         goto ok;
1739                 }
1740                 if (net_ratelimit())
1741                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1742                                pinfo->prefix_len);
1743                 in6_dev_put(in6_dev);
1744                 return;
1745
1746 ok:
1747
1748                 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1749
1750                 if (ifp == NULL && valid_lft) {
1751                         int max_addresses = in6_dev->cnf.max_addresses;
1752                         u32 addr_flags = 0;
1753
1754 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1755                         if (in6_dev->cnf.optimistic_dad &&
1756                             !ipv6_devconf.forwarding)
1757                                 addr_flags = IFA_F_OPTIMISTIC;
1758 #endif
1759
1760                         /* Do not allow to create too much of autoconfigured
1761                          * addresses; this would be too easy way to crash kernel.
1762                          */
1763                         if (!max_addresses ||
1764                             ipv6_count_addresses(in6_dev) < max_addresses)
1765                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1766                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1767                                                     addr_flags);
1768
1769                         if (!ifp || IS_ERR(ifp)) {
1770                                 in6_dev_put(in6_dev);
1771                                 return;
1772                         }
1773
1774                         update_lft = create = 1;
1775                         ifp->cstamp = jiffies;
1776                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1777                 }
1778
1779                 if (ifp) {
1780                         int flags;
1781                         unsigned long now;
1782 #ifdef CONFIG_IPV6_PRIVACY
1783                         struct inet6_ifaddr *ift;
1784 #endif
1785                         u32 stored_lft;
1786
1787                         /* update lifetime (RFC2462 5.5.3 e) */
1788                         spin_lock(&ifp->lock);
1789                         now = jiffies;
1790                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1791                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1792                         else
1793                                 stored_lft = 0;
1794                         if (!update_lft && stored_lft) {
1795                                 if (valid_lft > MIN_VALID_LIFETIME ||
1796                                     valid_lft > stored_lft)
1797                                         update_lft = 1;
1798                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1799                                         /* valid_lft <= stored_lft is always true */
1800                                         /* XXX: IPsec */
1801                                         update_lft = 0;
1802                                 } else {
1803                                         valid_lft = MIN_VALID_LIFETIME;
1804                                         if (valid_lft < prefered_lft)
1805                                                 prefered_lft = valid_lft;
1806                                         update_lft = 1;
1807                                 }
1808                         }
1809
1810                         if (update_lft) {
1811                                 ifp->valid_lft = valid_lft;
1812                                 ifp->prefered_lft = prefered_lft;
1813                                 ifp->tstamp = now;
1814                                 flags = ifp->flags;
1815                                 ifp->flags &= ~IFA_F_DEPRECATED;
1816                                 spin_unlock(&ifp->lock);
1817
1818                                 if (!(flags&IFA_F_TENTATIVE))
1819                                         ipv6_ifa_notify(0, ifp);
1820                         } else
1821                                 spin_unlock(&ifp->lock);
1822
1823 #ifdef CONFIG_IPV6_PRIVACY
1824                         read_lock_bh(&in6_dev->lock);
1825                         /* update all temporary addresses in the list */
1826                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1827                                 /*
1828                                  * When adjusting the lifetimes of an existing
1829                                  * temporary address, only lower the lifetimes.
1830                                  * Implementations must not increase the
1831                                  * lifetimes of an existing temporary address
1832                                  * when processing a Prefix Information Option.
1833                                  */
1834                                 if (ifp != ift->ifpub)
1835                                         continue;
1836
1837                                 spin_lock(&ift->lock);
1838                                 flags = ift->flags;
1839                                 if (ift->valid_lft > valid_lft &&
1840                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1841                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1842                                 if (ift->prefered_lft > prefered_lft &&
1843                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1844                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1845                                 spin_unlock(&ift->lock);
1846                                 if (!(flags&IFA_F_TENTATIVE))
1847                                         ipv6_ifa_notify(0, ift);
1848                         }
1849
1850                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1851                                 /*
1852                                  * When a new public address is created as described in [ADDRCONF],
1853                                  * also create a new temporary address.
1854                                  */
1855                                 read_unlock_bh(&in6_dev->lock);
1856                                 ipv6_create_tempaddr(ifp, NULL);
1857                         } else {
1858                                 read_unlock_bh(&in6_dev->lock);
1859                         }
1860 #endif
1861                         in6_ifa_put(ifp);
1862                         addrconf_verify(0);
1863                 }
1864         }
1865         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1866         in6_dev_put(in6_dev);
1867 }
1868
1869 /*
1870  *      Set destination address.
1871  *      Special case for SIT interfaces where we create a new "virtual"
1872  *      device.
1873  */
1874 int addrconf_set_dstaddr(void __user *arg)
1875 {
1876         struct in6_ifreq ireq;
1877         struct net_device *dev;
1878         int err = -EINVAL;
1879
1880         rtnl_lock();
1881
1882         err = -EFAULT;
1883         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1884                 goto err_exit;
1885
1886         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1887
1888         err = -ENODEV;
1889         if (dev == NULL)
1890                 goto err_exit;
1891
1892 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1893         if (dev->type == ARPHRD_SIT) {
1894                 struct ifreq ifr;
1895                 mm_segment_t    oldfs;
1896                 struct ip_tunnel_parm p;
1897
1898                 err = -EADDRNOTAVAIL;
1899                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1900                         goto err_exit;
1901
1902                 memset(&p, 0, sizeof(p));
1903                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1904                 p.iph.saddr = 0;
1905                 p.iph.version = 4;
1906                 p.iph.ihl = 5;
1907                 p.iph.protocol = IPPROTO_IPV6;
1908                 p.iph.ttl = 64;
1909                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1910
1911                 oldfs = get_fs(); set_fs(KERNEL_DS);
1912                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1913                 set_fs(oldfs);
1914
1915                 if (err == 0) {
1916                         err = -ENOBUFS;
1917                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1918                                 goto err_exit;
1919                         err = dev_open(dev);
1920                 }
1921         }
1922 #endif
1923
1924 err_exit:
1925         rtnl_unlock();
1926         return err;
1927 }
1928
1929 /*
1930  *      Manual configuration of address on an interface
1931  */
1932 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1933                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1934 {
1935         struct inet6_ifaddr *ifp;
1936         struct inet6_dev *idev;
1937         struct net_device *dev;
1938         int scope;
1939         u32 flags = RTF_EXPIRES;
1940
1941         ASSERT_RTNL();
1942
1943         /* check the lifetime */
1944         if (!valid_lft || prefered_lft > valid_lft)
1945                 return -EINVAL;
1946
1947         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1948                 return -ENODEV;
1949
1950         if ((idev = addrconf_add_dev(dev)) == NULL)
1951                 return -ENOBUFS;
1952
1953         scope = ipv6_addr_scope(pfx);
1954
1955         if (valid_lft == INFINITY_LIFE_TIME) {
1956                 ifa_flags |= IFA_F_PERMANENT;
1957                 flags = 0;
1958         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1959                 valid_lft = 0x7FFFFFFF/HZ;
1960
1961         if (prefered_lft == 0)
1962                 ifa_flags |= IFA_F_DEPRECATED;
1963         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1964                  (prefered_lft != INFINITY_LIFE_TIME))
1965                 prefered_lft = 0x7FFFFFFF/HZ;
1966
1967         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1968
1969         if (!IS_ERR(ifp)) {
1970                 spin_lock_bh(&ifp->lock);
1971                 ifp->valid_lft = valid_lft;
1972                 ifp->prefered_lft = prefered_lft;
1973                 ifp->tstamp = jiffies;
1974                 spin_unlock_bh(&ifp->lock);
1975
1976                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1977                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1978                 /*
1979                  * Note that section 3.1 of RFC 4429 indicates
1980                  * that the Optimistic flag should not be set for
1981                  * manually configured addresses
1982                  */
1983                 addrconf_dad_start(ifp, 0);
1984                 in6_ifa_put(ifp);
1985                 addrconf_verify(0);
1986                 return 0;
1987         }
1988
1989         return PTR_ERR(ifp);
1990 }
1991
1992 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1993 {
1994         struct inet6_ifaddr *ifp;
1995         struct inet6_dev *idev;
1996         struct net_device *dev;
1997
1998         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1999                 return -ENODEV;
2000
2001         if ((idev = __in6_dev_get(dev)) == NULL)
2002                 return -ENXIO;
2003
2004         read_lock_bh(&idev->lock);
2005         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2006                 if (ifp->prefix_len == plen &&
2007                     ipv6_addr_equal(pfx, &ifp->addr)) {
2008                         in6_ifa_hold(ifp);
2009                         read_unlock_bh(&idev->lock);
2010
2011                         ipv6_del_addr(ifp);
2012
2013                         /* If the last address is deleted administratively,
2014                            disable IPv6 on this interface.
2015                          */
2016                         if (idev->addr_list == NULL)
2017                                 addrconf_ifdown(idev->dev, 1);
2018                         return 0;
2019                 }
2020         }
2021         read_unlock_bh(&idev->lock);
2022         return -EADDRNOTAVAIL;
2023 }
2024
2025
2026 int addrconf_add_ifaddr(void __user *arg)
2027 {
2028         struct in6_ifreq ireq;
2029         int err;
2030
2031         if (!capable(CAP_NET_ADMIN))
2032                 return -EPERM;
2033
2034         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2035                 return -EFAULT;
2036
2037         rtnl_lock();
2038         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2039                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2040         rtnl_unlock();
2041         return err;
2042 }
2043
2044 int addrconf_del_ifaddr(void __user *arg)
2045 {
2046         struct in6_ifreq ireq;
2047         int err;
2048
2049         if (!capable(CAP_NET_ADMIN))
2050                 return -EPERM;
2051
2052         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2053                 return -EFAULT;
2054
2055         rtnl_lock();
2056         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2057         rtnl_unlock();
2058         return err;
2059 }
2060
2061 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2062 static void sit_add_v4_addrs(struct inet6_dev *idev)
2063 {
2064         struct inet6_ifaddr * ifp;
2065         struct in6_addr addr;
2066         struct net_device *dev;
2067         int scope;
2068
2069         ASSERT_RTNL();
2070
2071         memset(&addr, 0, sizeof(struct in6_addr));
2072         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2073
2074         if (idev->dev->flags&IFF_POINTOPOINT) {
2075                 addr.s6_addr32[0] = htonl(0xfe800000);
2076                 scope = IFA_LINK;
2077         } else {
2078                 scope = IPV6_ADDR_COMPATv4;
2079         }
2080
2081         if (addr.s6_addr32[3]) {
2082                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2083                 if (!IS_ERR(ifp)) {
2084                         spin_lock_bh(&ifp->lock);
2085                         ifp->flags &= ~IFA_F_TENTATIVE;
2086                         spin_unlock_bh(&ifp->lock);
2087                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2088                         in6_ifa_put(ifp);
2089                 }
2090                 return;
2091         }
2092
2093         for_each_netdev(&init_net, dev) {
2094                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2095                 if (in_dev && (dev->flags & IFF_UP)) {
2096                         struct in_ifaddr * ifa;
2097
2098                         int flag = scope;
2099
2100                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2101                                 int plen;
2102
2103                                 addr.s6_addr32[3] = ifa->ifa_local;
2104
2105                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2106                                         continue;
2107                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2108                                         if (idev->dev->flags&IFF_POINTOPOINT)
2109                                                 continue;
2110                                         flag |= IFA_HOST;
2111                                 }
2112                                 if (idev->dev->flags&IFF_POINTOPOINT)
2113                                         plen = 64;
2114                                 else
2115                                         plen = 96;
2116
2117                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2118                                                     IFA_F_PERMANENT);
2119                                 if (!IS_ERR(ifp)) {
2120                                         spin_lock_bh(&ifp->lock);
2121                                         ifp->flags &= ~IFA_F_TENTATIVE;
2122                                         spin_unlock_bh(&ifp->lock);
2123                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2124                                         in6_ifa_put(ifp);
2125                                 }
2126                         }
2127                 }
2128         }
2129 }
2130 #endif
2131
2132 static void init_loopback(struct net_device *dev)
2133 {
2134         struct inet6_dev  *idev;
2135         struct inet6_ifaddr * ifp;
2136
2137         /* ::1 */
2138
2139         ASSERT_RTNL();
2140
2141         if ((idev = ipv6_find_idev(dev)) == NULL) {
2142                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2143                 return;
2144         }
2145
2146         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2147         if (!IS_ERR(ifp)) {
2148                 spin_lock_bh(&ifp->lock);
2149                 ifp->flags &= ~IFA_F_TENTATIVE;
2150                 spin_unlock_bh(&ifp->lock);
2151                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2152                 in6_ifa_put(ifp);
2153         }
2154 }
2155
2156 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2157 {
2158         struct inet6_ifaddr * ifp;
2159         u32 addr_flags = IFA_F_PERMANENT;
2160
2161 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2162         if (idev->cnf.optimistic_dad &&
2163             !ipv6_devconf.forwarding)
2164                 addr_flags |= IFA_F_OPTIMISTIC;
2165 #endif
2166
2167
2168         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2169         if (!IS_ERR(ifp)) {
2170                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2171                 addrconf_dad_start(ifp, 0);
2172                 in6_ifa_put(ifp);
2173         }
2174 }
2175
2176 static void addrconf_dev_config(struct net_device *dev)
2177 {
2178         struct in6_addr addr;
2179         struct inet6_dev    * idev;
2180
2181         ASSERT_RTNL();
2182
2183         if ((dev->type != ARPHRD_ETHER) &&
2184             (dev->type != ARPHRD_FDDI) &&
2185             (dev->type != ARPHRD_IEEE802_TR) &&
2186             (dev->type != ARPHRD_ARCNET) &&
2187             (dev->type != ARPHRD_INFINIBAND)) {
2188                 /* Alas, we support only Ethernet autoconfiguration. */
2189                 return;
2190         }
2191
2192         idev = addrconf_add_dev(dev);
2193         if (idev == NULL)
2194                 return;
2195
2196         memset(&addr, 0, sizeof(struct in6_addr));
2197         addr.s6_addr32[0] = htonl(0xFE800000);
2198
2199         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2200                 addrconf_add_linklocal(idev, &addr);
2201 }
2202
2203 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2204 static void addrconf_sit_config(struct net_device *dev)
2205 {
2206         struct inet6_dev *idev;
2207
2208         ASSERT_RTNL();
2209
2210         /*
2211          * Configure the tunnel with one of our IPv4
2212          * addresses... we should configure all of
2213          * our v4 addrs in the tunnel
2214          */
2215
2216         if ((idev = ipv6_find_idev(dev)) == NULL) {
2217                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2218                 return;
2219         }
2220
2221         if (dev->priv_flags & IFF_ISATAP) {
2222                 struct in6_addr addr;
2223
2224                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2225                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2226                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2227                         addrconf_add_linklocal(idev, &addr);
2228                 return;
2229         }
2230
2231         sit_add_v4_addrs(idev);
2232
2233         if (dev->flags&IFF_POINTOPOINT) {
2234                 addrconf_add_mroute(dev);
2235                 addrconf_add_lroute(dev);
2236         } else
2237                 sit_route_add(dev);
2238 }
2239 #endif
2240
2241 static inline int
2242 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2243 {
2244         struct in6_addr lladdr;
2245
2246         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2247                 addrconf_add_linklocal(idev, &lladdr);
2248                 return 0;
2249         }
2250         return -1;
2251 }
2252
2253 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2254 {
2255         struct net_device *link_dev;
2256
2257         /* first try to inherit the link-local address from the link device */
2258         if (idev->dev->iflink &&
2259             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2260                 if (!ipv6_inherit_linklocal(idev, link_dev))
2261                         return;
2262         }
2263         /* then try to inherit it from any device */
2264         for_each_netdev(&init_net, link_dev) {
2265                 if (!ipv6_inherit_linklocal(idev, link_dev))
2266                         return;
2267         }
2268         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2269 }
2270
2271 /*
2272  * Autoconfigure tunnel with a link-local address so routing protocols,
2273  * DHCPv6, MLD etc. can be run over the virtual link
2274  */
2275
2276 static void addrconf_ip6_tnl_config(struct net_device *dev)
2277 {
2278         struct inet6_dev *idev;
2279
2280         ASSERT_RTNL();
2281
2282         if ((idev = addrconf_add_dev(dev)) == NULL) {
2283                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2284                 return;
2285         }
2286         ip6_tnl_add_linklocal(idev);
2287 }
2288
2289 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2290                            void * data)
2291 {
2292         struct net_device *dev = (struct net_device *) data;
2293         struct inet6_dev *idev = __in6_dev_get(dev);
2294         int run_pending = 0;
2295         int err;
2296
2297         if (dev->nd_net != &init_net)
2298                 return NOTIFY_DONE;
2299
2300         switch(event) {
2301         case NETDEV_REGISTER:
2302                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2303                         idev = ipv6_add_dev(dev);
2304                         if (!idev)
2305                                 return notifier_from_errno(-ENOMEM);
2306                 }
2307                 break;
2308         case NETDEV_UP:
2309         case NETDEV_CHANGE:
2310                 if (dev->flags & IFF_SLAVE)
2311                         break;
2312
2313                 if (event == NETDEV_UP) {
2314                         if (!addrconf_qdisc_ok(dev)) {
2315                                 /* device is not ready yet. */
2316                                 printk(KERN_INFO
2317                                         "ADDRCONF(NETDEV_UP): %s: "
2318                                         "link is not ready\n",
2319                                         dev->name);
2320                                 break;
2321                         }
2322
2323                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2324                                 idev = ipv6_add_dev(dev);
2325
2326                         if (idev)
2327                                 idev->if_flags |= IF_READY;
2328                 } else {
2329                         if (!addrconf_qdisc_ok(dev)) {
2330                                 /* device is still not ready. */
2331                                 break;
2332                         }
2333
2334                         if (idev) {
2335                                 if (idev->if_flags & IF_READY) {
2336                                         /* device is already configured. */
2337                                         break;
2338                                 }
2339                                 idev->if_flags |= IF_READY;
2340                         }
2341
2342                         printk(KERN_INFO
2343                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2344                                         "link becomes ready\n",
2345                                         dev->name);
2346
2347                         run_pending = 1;
2348                 }
2349
2350                 switch(dev->type) {
2351 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2352                 case ARPHRD_SIT:
2353                         addrconf_sit_config(dev);
2354                         break;
2355 #endif
2356                 case ARPHRD_TUNNEL6:
2357                         addrconf_ip6_tnl_config(dev);
2358                         break;
2359                 case ARPHRD_LOOPBACK:
2360                         init_loopback(dev);
2361                         break;
2362
2363                 default:
2364                         addrconf_dev_config(dev);
2365                         break;
2366                 }
2367                 if (idev) {
2368                         if (run_pending)
2369                                 addrconf_dad_run(idev);
2370
2371                         /* If the MTU changed during the interface down, when the
2372                            interface up, the changed MTU must be reflected in the
2373                            idev as well as routers.
2374                          */
2375                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2376                                 rt6_mtu_change(dev, dev->mtu);
2377                                 idev->cnf.mtu6 = dev->mtu;
2378                         }
2379                         idev->tstamp = jiffies;
2380                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2381                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2382                            stop IPv6 on this interface.
2383                          */
2384                         if (dev->mtu < IPV6_MIN_MTU)
2385                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2386                 }
2387                 break;
2388
2389         case NETDEV_CHANGEMTU:
2390                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2391                         rt6_mtu_change(dev, dev->mtu);
2392                         idev->cnf.mtu6 = dev->mtu;
2393                         break;
2394                 }
2395
2396                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2397                         idev = ipv6_add_dev(dev);
2398                         if (idev)
2399                                 break;
2400                 }
2401
2402                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2403
2404         case NETDEV_DOWN:
2405         case NETDEV_UNREGISTER:
2406                 /*
2407                  *      Remove all addresses from this interface.
2408                  */
2409                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2410                 break;
2411
2412         case NETDEV_CHANGENAME:
2413                 if (idev) {
2414                         snmp6_unregister_dev(idev);
2415                         addrconf_sysctl_unregister(idev);
2416                         addrconf_sysctl_register(idev);
2417                         err = snmp6_register_dev(idev);
2418                         if (err)
2419                                 return notifier_from_errno(err);
2420                 }
2421                 break;
2422         }
2423
2424         return NOTIFY_OK;
2425 }
2426
2427 /*
2428  *      addrconf module should be notified of a device going up
2429  */
2430 static struct notifier_block ipv6_dev_notf = {
2431         .notifier_call = addrconf_notify,
2432         .priority = 0
2433 };
2434
2435 static int addrconf_ifdown(struct net_device *dev, int how)
2436 {
2437         struct inet6_dev *idev;
2438         struct inet6_ifaddr *ifa, **bifa;
2439         int i;
2440
2441         ASSERT_RTNL();
2442
2443         if (dev == init_net.loopback_dev && how == 1)
2444                 how = 0;
2445
2446         rt6_ifdown(dev);
2447         neigh_ifdown(&nd_tbl, dev);
2448
2449         idev = __in6_dev_get(dev);
2450         if (idev == NULL)
2451                 return -ENODEV;
2452
2453         /* Step 1: remove reference to ipv6 device from parent device.
2454                    Do not dev_put!
2455          */
2456         if (how == 1) {
2457                 idev->dead = 1;
2458
2459                 /* protected by rtnl_lock */
2460                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2461
2462                 /* Step 1.5: remove snmp6 entry */
2463                 snmp6_unregister_dev(idev);
2464
2465         }
2466
2467         /* Step 2: clear hash table */
2468         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2469                 bifa = &inet6_addr_lst[i];
2470
2471                 write_lock_bh(&addrconf_hash_lock);
2472                 while ((ifa = *bifa) != NULL) {
2473                         if (ifa->idev == idev) {
2474                                 *bifa = ifa->lst_next;
2475                                 ifa->lst_next = NULL;
2476                                 addrconf_del_timer(ifa);
2477                                 in6_ifa_put(ifa);
2478                                 continue;
2479                         }
2480                         bifa = &ifa->lst_next;
2481                 }
2482                 write_unlock_bh(&addrconf_hash_lock);
2483         }
2484
2485         write_lock_bh(&idev->lock);
2486
2487         /* Step 3: clear flags for stateless addrconf */
2488         if (how != 1)
2489                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2490
2491         /* Step 4: clear address list */
2492 #ifdef CONFIG_IPV6_PRIVACY
2493         if (how == 1 && del_timer(&idev->regen_timer))
2494                 in6_dev_put(idev);
2495
2496         /* clear tempaddr list */
2497         while ((ifa = idev->tempaddr_list) != NULL) {
2498                 idev->tempaddr_list = ifa->tmp_next;
2499                 ifa->tmp_next = NULL;
2500                 ifa->dead = 1;
2501                 write_unlock_bh(&idev->lock);
2502                 spin_lock_bh(&ifa->lock);
2503
2504                 if (ifa->ifpub) {
2505                         in6_ifa_put(ifa->ifpub);
2506                         ifa->ifpub = NULL;
2507                 }
2508                 spin_unlock_bh(&ifa->lock);
2509                 in6_ifa_put(ifa);
2510                 write_lock_bh(&idev->lock);
2511         }
2512 #endif
2513         while ((ifa = idev->addr_list) != NULL) {
2514                 idev->addr_list = ifa->if_next;
2515                 ifa->if_next = NULL;
2516                 ifa->dead = 1;
2517                 addrconf_del_timer(ifa);
2518                 write_unlock_bh(&idev->lock);
2519
2520                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2521                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2522                 in6_ifa_put(ifa);
2523
2524                 write_lock_bh(&idev->lock);
2525         }
2526         write_unlock_bh(&idev->lock);
2527
2528         /* Step 5: Discard multicast list */
2529
2530         if (how == 1)
2531                 ipv6_mc_destroy_dev(idev);
2532         else
2533                 ipv6_mc_down(idev);
2534
2535         idev->tstamp = jiffies;
2536
2537         /* Shot the device (if unregistered) */
2538
2539         if (how == 1) {
2540                 addrconf_sysctl_unregister(idev);
2541                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2542                 neigh_ifdown(&nd_tbl, dev);
2543                 in6_dev_put(idev);
2544         }
2545         return 0;
2546 }
2547
2548 static void addrconf_rs_timer(unsigned long data)
2549 {
2550         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2551
2552         if (ifp->idev->cnf.forwarding)
2553                 goto out;
2554
2555         if (ifp->idev->if_flags & IF_RA_RCVD) {
2556                 /*
2557                  *      Announcement received after solicitation
2558                  *      was sent
2559                  */
2560                 goto out;
2561         }
2562
2563         spin_lock(&ifp->lock);
2564         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2565                 struct in6_addr all_routers;
2566
2567                 /* The wait after the last probe can be shorter */
2568                 addrconf_mod_timer(ifp, AC_RS,
2569                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2570                                    ifp->idev->cnf.rtr_solicit_delay :
2571                                    ifp->idev->cnf.rtr_solicit_interval);
2572                 spin_unlock(&ifp->lock);
2573
2574                 ipv6_addr_all_routers(&all_routers);
2575
2576                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2577         } else {
2578                 spin_unlock(&ifp->lock);
2579                 /*
2580                  * Note: we do not support deprecated "all on-link"
2581                  * assumption any longer.
2582                  */
2583                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2584                        ifp->idev->dev->name);
2585         }
2586
2587 out:
2588         in6_ifa_put(ifp);
2589 }
2590
2591 /*
2592  *      Duplicate Address Detection
2593  */
2594 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2595 {
2596         unsigned long rand_num;
2597         struct inet6_dev *idev = ifp->idev;
2598
2599         if (ifp->flags & IFA_F_OPTIMISTIC)
2600                 rand_num = 0;
2601         else
2602                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2603
2604         ifp->probes = idev->cnf.dad_transmits;
2605         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2606 }
2607
2608 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2609 {
2610         struct inet6_dev *idev = ifp->idev;
2611         struct net_device *dev = idev->dev;
2612
2613         addrconf_join_solict(dev, &ifp->addr);
2614
2615         net_srandom(ifp->addr.s6_addr32[3]);
2616
2617         read_lock_bh(&idev->lock);
2618         if (ifp->dead)
2619                 goto out;
2620         spin_lock_bh(&ifp->lock);
2621
2622         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2623             !(ifp->flags&IFA_F_TENTATIVE) ||
2624             ifp->flags & IFA_F_NODAD) {
2625                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2626                 spin_unlock_bh(&ifp->lock);
2627                 read_unlock_bh(&idev->lock);
2628
2629                 addrconf_dad_completed(ifp);
2630                 return;
2631         }
2632
2633         if (!(idev->if_flags & IF_READY)) {
2634                 spin_unlock_bh(&ifp->lock);
2635                 read_unlock_bh(&idev->lock);
2636                 /*
2637                  * If the defice is not ready:
2638                  * - keep it tentative if it is a permanent address.
2639                  * - otherwise, kill it.
2640                  */
2641                 in6_ifa_hold(ifp);
2642                 addrconf_dad_stop(ifp);
2643                 return;
2644         }
2645
2646         /*
2647          * Optimistic nodes can start receiving
2648          * Frames right away
2649          */
2650         if(ifp->flags & IFA_F_OPTIMISTIC)
2651                 ip6_ins_rt(ifp->rt);
2652
2653         addrconf_dad_kick(ifp);
2654         spin_unlock_bh(&ifp->lock);
2655 out:
2656         read_unlock_bh(&idev->lock);
2657 }
2658
2659 static void addrconf_dad_timer(unsigned long data)
2660 {
2661         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2662         struct inet6_dev *idev = ifp->idev;
2663         struct in6_addr unspec;
2664         struct in6_addr mcaddr;
2665
2666         read_lock_bh(&idev->lock);
2667         if (idev->dead) {
2668                 read_unlock_bh(&idev->lock);
2669                 goto out;
2670         }
2671         spin_lock_bh(&ifp->lock);
2672         if (ifp->probes == 0) {
2673                 /*
2674                  * DAD was successful
2675                  */
2676
2677                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2678                 spin_unlock_bh(&ifp->lock);
2679                 read_unlock_bh(&idev->lock);
2680
2681                 addrconf_dad_completed(ifp);
2682
2683                 goto out;
2684         }
2685
2686         ifp->probes--;
2687         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2688         spin_unlock_bh(&ifp->lock);
2689         read_unlock_bh(&idev->lock);
2690
2691         /* send a neighbour solicitation for our addr */
2692         memset(&unspec, 0, sizeof(unspec));
2693         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2694         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2695 out:
2696         in6_ifa_put(ifp);
2697 }
2698
2699 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2700 {
2701         struct net_device *     dev = ifp->idev->dev;
2702
2703         /*
2704          *      Configure the address for reception. Now it is valid.
2705          */
2706
2707         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2708
2709         /* If added prefix is link local and forwarding is off,
2710            start sending router solicitations.
2711          */
2712
2713         if (ifp->idev->cnf.forwarding == 0 &&
2714             ifp->idev->cnf.rtr_solicits > 0 &&
2715             (dev->flags&IFF_LOOPBACK) == 0 &&
2716             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2717                 struct in6_addr all_routers;
2718
2719                 ipv6_addr_all_routers(&all_routers);
2720
2721                 /*
2722                  *      If a host as already performed a random delay
2723                  *      [...] as part of DAD [...] there is no need
2724                  *      to delay again before sending the first RS
2725                  */
2726                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2727
2728                 spin_lock_bh(&ifp->lock);
2729                 ifp->probes = 1;
2730                 ifp->idev->if_flags |= IF_RS_SENT;
2731                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2732                 spin_unlock_bh(&ifp->lock);
2733         }
2734 }
2735
2736 static void addrconf_dad_run(struct inet6_dev *idev) {
2737         struct inet6_ifaddr *ifp;
2738
2739         read_lock_bh(&idev->lock);
2740         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2741                 spin_lock_bh(&ifp->lock);
2742                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2743                         spin_unlock_bh(&ifp->lock);
2744                         continue;
2745                 }
2746                 spin_unlock_bh(&ifp->lock);
2747                 addrconf_dad_kick(ifp);
2748         }
2749         read_unlock_bh(&idev->lock);
2750 }
2751
2752 #ifdef CONFIG_PROC_FS
2753 struct if6_iter_state {
2754         struct seq_net_private p;
2755         int bucket;
2756 };
2757
2758 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2759 {
2760         struct inet6_ifaddr *ifa = NULL;
2761         struct if6_iter_state *state = seq->private;
2762         struct net *net = state->p.net;
2763
2764         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2765                 ifa = inet6_addr_lst[state->bucket];
2766
2767                 while (ifa && ifa->idev->dev->nd_net != net)
2768                         ifa = ifa->lst_next;
2769                 if (ifa)
2770                         break;
2771         }
2772         return ifa;
2773 }
2774
2775 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2776 {
2777         struct if6_iter_state *state = seq->private;
2778         struct net *net = state->p.net;
2779
2780         ifa = ifa->lst_next;
2781 try_again:
2782         if (ifa) {
2783                 if (ifa->idev->dev->nd_net != net) {
2784                         ifa = ifa->lst_next;
2785                         goto try_again;
2786                 }
2787         }
2788
2789         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2790                 ifa = inet6_addr_lst[state->bucket];
2791                 goto try_again;
2792         }
2793
2794         return ifa;
2795 }
2796
2797 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2798 {
2799         struct inet6_ifaddr *ifa = if6_get_first(seq);
2800
2801         if (ifa)
2802                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2803                         --pos;
2804         return pos ? NULL : ifa;
2805 }
2806
2807 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2808         __acquires(addrconf_hash_lock)
2809 {
2810         read_lock_bh(&addrconf_hash_lock);
2811         return if6_get_idx(seq, *pos);
2812 }
2813
2814 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2815 {
2816         struct inet6_ifaddr *ifa;
2817
2818         ifa = if6_get_next(seq, v);
2819         ++*pos;
2820         return ifa;
2821 }
2822
2823 static void if6_seq_stop(struct seq_file *seq, void *v)
2824         __releases(addrconf_hash_lock)
2825 {
2826         read_unlock_bh(&addrconf_hash_lock);
2827 }
2828
2829 static int if6_seq_show(struct seq_file *seq, void *v)
2830 {
2831         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2832         seq_printf(seq,
2833                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2834                    NIP6(ifp->addr),
2835                    ifp->idev->dev->ifindex,
2836                    ifp->prefix_len,
2837                    ifp->scope,
2838                    ifp->flags,
2839                    ifp->idev->dev->name);
2840         return 0;
2841 }
2842
2843 static const struct seq_operations if6_seq_ops = {
2844         .start  = if6_seq_start,
2845         .next   = if6_seq_next,
2846         .show   = if6_seq_show,
2847         .stop   = if6_seq_stop,
2848 };
2849
2850 static int if6_seq_open(struct inode *inode, struct file *file)
2851 {
2852         return seq_open_net(inode, file, &if6_seq_ops,
2853                             sizeof(struct if6_iter_state));
2854 }
2855
2856 static const struct file_operations if6_fops = {
2857         .owner          = THIS_MODULE,
2858         .open           = if6_seq_open,
2859         .read           = seq_read,
2860         .llseek         = seq_lseek,
2861         .release        = seq_release_net,
2862 };
2863
2864 static int if6_proc_net_init(struct net *net)
2865 {
2866         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2867                 return -ENOMEM;
2868         return 0;
2869 }
2870
2871 static void if6_proc_net_exit(struct net *net)
2872 {
2873        proc_net_remove(net, "if_inet6");
2874 }
2875
2876 static struct pernet_operations if6_proc_net_ops = {
2877        .init = if6_proc_net_init,
2878        .exit = if6_proc_net_exit,
2879 };
2880
2881 int __init if6_proc_init(void)
2882 {
2883         return register_pernet_subsys(&if6_proc_net_ops);
2884 }
2885
2886 void if6_proc_exit(void)
2887 {
2888         unregister_pernet_subsys(&if6_proc_net_ops);
2889 }
2890 #endif  /* CONFIG_PROC_FS */
2891
2892 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2893 /* Check if address is a home address configured on any interface. */
2894 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2895 {
2896         int ret = 0;
2897         struct inet6_ifaddr * ifp;
2898         u8 hash = ipv6_addr_hash(addr);
2899         read_lock_bh(&addrconf_hash_lock);
2900         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2901                 if (ifp->idev->dev->nd_net != net)
2902                         continue;
2903                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2904                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2905                         ret = 1;
2906                         break;
2907                 }
2908         }
2909         read_unlock_bh(&addrconf_hash_lock);
2910         return ret;
2911 }
2912 #endif
2913
2914 /*
2915  *      Periodic address status verification
2916  */
2917
2918 static void addrconf_verify(unsigned long foo)
2919 {
2920         struct inet6_ifaddr *ifp;
2921         unsigned long now, next;
2922         int i;
2923
2924         spin_lock_bh(&addrconf_verify_lock);
2925         now = jiffies;
2926         next = now + ADDR_CHECK_FREQUENCY;
2927
2928         del_timer(&addr_chk_timer);
2929
2930         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2931
2932 restart:
2933                 read_lock(&addrconf_hash_lock);
2934                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2935                         unsigned long age;
2936 #ifdef CONFIG_IPV6_PRIVACY
2937                         unsigned long regen_advance;
2938 #endif
2939
2940                         if (ifp->flags & IFA_F_PERMANENT)
2941                                 continue;
2942
2943                         spin_lock(&ifp->lock);
2944                         age = (now - ifp->tstamp) / HZ;
2945
2946 #ifdef CONFIG_IPV6_PRIVACY
2947                         regen_advance = ifp->idev->cnf.regen_max_retry *
2948                                         ifp->idev->cnf.dad_transmits *
2949                                         ifp->idev->nd_parms->retrans_time / HZ;
2950 #endif
2951
2952                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2953                             age >= ifp->valid_lft) {
2954                                 spin_unlock(&ifp->lock);
2955                                 in6_ifa_hold(ifp);
2956                                 read_unlock(&addrconf_hash_lock);
2957                                 ipv6_del_addr(ifp);
2958                                 goto restart;
2959                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2960                                 spin_unlock(&ifp->lock);
2961                                 continue;
2962                         } else if (age >= ifp->prefered_lft) {
2963                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2964                                 int deprecate = 0;
2965
2966                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2967                                         deprecate = 1;
2968                                         ifp->flags |= IFA_F_DEPRECATED;
2969                                 }
2970
2971                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2972                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2973
2974                                 spin_unlock(&ifp->lock);
2975
2976                                 if (deprecate) {
2977                                         in6_ifa_hold(ifp);
2978                                         read_unlock(&addrconf_hash_lock);
2979
2980                                         ipv6_ifa_notify(0, ifp);
2981                                         in6_ifa_put(ifp);
2982                                         goto restart;
2983                                 }
2984 #ifdef CONFIG_IPV6_PRIVACY
2985                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2986                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2987                                 if (age >= ifp->prefered_lft - regen_advance) {
2988                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2989                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2990                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2991                                         if (!ifp->regen_count && ifpub) {
2992                                                 ifp->regen_count++;
2993                                                 in6_ifa_hold(ifp);
2994                                                 in6_ifa_hold(ifpub);
2995                                                 spin_unlock(&ifp->lock);
2996                                                 read_unlock(&addrconf_hash_lock);
2997                                                 spin_lock(&ifpub->lock);
2998                                                 ifpub->regen_count = 0;
2999                                                 spin_unlock(&ifpub->lock);
3000                                                 ipv6_create_tempaddr(ifpub, ifp);
3001                                                 in6_ifa_put(ifpub);
3002                                                 in6_ifa_put(ifp);
3003                                                 goto restart;
3004                                         }
3005                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3006                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3007                                 spin_unlock(&ifp->lock);
3008 #endif
3009                         } else {
3010                                 /* ifp->prefered_lft <= ifp->valid_lft */
3011                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3012                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3013                                 spin_unlock(&ifp->lock);
3014                         }
3015                 }
3016                 read_unlock(&addrconf_hash_lock);
3017         }
3018
3019         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3020         add_timer(&addr_chk_timer);
3021         spin_unlock_bh(&addrconf_verify_lock);
3022 }
3023
3024 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3025 {
3026         struct in6_addr *pfx = NULL;
3027
3028         if (addr)
3029                 pfx = nla_data(addr);
3030
3031         if (local) {
3032                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3033                         pfx = NULL;
3034                 else
3035                         pfx = nla_data(local);
3036         }
3037
3038         return pfx;
3039 }
3040
3041 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3042         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3043         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3044         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3045 };
3046
3047 static int
3048 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3049 {
3050         struct net *net = skb->sk->sk_net;
3051         struct ifaddrmsg *ifm;
3052         struct nlattr *tb[IFA_MAX+1];
3053         struct in6_addr *pfx;
3054         int err;
3055
3056         if (net != &init_net)
3057                 return -EINVAL;
3058
3059         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3060         if (err < 0)
3061                 return err;
3062
3063         ifm = nlmsg_data(nlh);
3064         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3065         if (pfx == NULL)
3066                 return -EINVAL;
3067
3068         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3069 }
3070
3071 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3072                              u32 prefered_lft, u32 valid_lft)
3073 {
3074         u32 flags = RTF_EXPIRES;
3075
3076         if (!valid_lft || (prefered_lft > valid_lft))
3077                 return -EINVAL;
3078
3079         if (valid_lft == INFINITY_LIFE_TIME) {
3080                 ifa_flags |= IFA_F_PERMANENT;
3081                 flags = 0;
3082         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3083                 valid_lft = 0x7FFFFFFF/HZ;
3084
3085         if (prefered_lft == 0)
3086                 ifa_flags |= IFA_F_DEPRECATED;
3087         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3088                  (prefered_lft != INFINITY_LIFE_TIME))
3089                 prefered_lft = 0x7FFFFFFF/HZ;
3090
3091         spin_lock_bh(&ifp->lock);
3092         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3093         ifp->tstamp = jiffies;
3094         ifp->valid_lft = valid_lft;
3095         ifp->prefered_lft = prefered_lft;
3096
3097         spin_unlock_bh(&ifp->lock);
3098         if (!(ifp->flags&IFA_F_TENTATIVE))
3099                 ipv6_ifa_notify(0, ifp);
3100
3101         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3102                               jiffies_to_clock_t(valid_lft * HZ), flags);
3103         addrconf_verify(0);
3104
3105         return 0;
3106 }
3107
3108 static int
3109 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3110 {
3111         struct net *net = skb->sk->sk_net;
3112         struct ifaddrmsg *ifm;
3113         struct nlattr *tb[IFA_MAX+1];
3114         struct in6_addr *pfx;
3115         struct inet6_ifaddr *ifa;
3116         struct net_device *dev;
3117         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3118         u8 ifa_flags;
3119         int err;
3120
3121         if (net != &init_net)
3122                 return -EINVAL;
3123
3124         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3125         if (err < 0)
3126                 return err;
3127
3128         ifm = nlmsg_data(nlh);
3129         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3130         if (pfx == NULL)
3131                 return -EINVAL;
3132
3133         if (tb[IFA_CACHEINFO]) {
3134                 struct ifa_cacheinfo *ci;
3135
3136                 ci = nla_data(tb[IFA_CACHEINFO]);
3137                 valid_lft = ci->ifa_valid;
3138                 preferred_lft = ci->ifa_prefered;
3139         } else {
3140                 preferred_lft = INFINITY_LIFE_TIME;
3141                 valid_lft = INFINITY_LIFE_TIME;
3142         }
3143
3144         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3145         if (dev == NULL)
3146                 return -ENODEV;
3147
3148         /* We ignore other flags so far. */
3149         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3150
3151         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3152         if (ifa == NULL) {
3153                 /*
3154                  * It would be best to check for !NLM_F_CREATE here but
3155                  * userspace alreay relies on not having to provide this.
3156                  */
3157                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3158                                       ifa_flags, preferred_lft, valid_lft);
3159         }
3160
3161         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3162             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3163                 err = -EEXIST;
3164         else
3165                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3166
3167         in6_ifa_put(ifa);
3168
3169         return err;
3170 }
3171
3172 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3173                           u8 scope, int ifindex)
3174 {
3175         struct ifaddrmsg *ifm;
3176
3177         ifm = nlmsg_data(nlh);
3178         ifm->ifa_family = AF_INET6;
3179         ifm->ifa_prefixlen = prefixlen;
3180         ifm->ifa_flags = flags;
3181         ifm->ifa_scope = scope;
3182         ifm->ifa_index = ifindex;
3183 }
3184
3185 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3186                          unsigned long tstamp, u32 preferred, u32 valid)
3187 {
3188         struct ifa_cacheinfo ci;
3189
3190         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3191                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3192         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3193                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3194         ci.ifa_prefered = preferred;
3195         ci.ifa_valid = valid;
3196
3197         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3198 }
3199
3200 static inline int rt_scope(int ifa_scope)
3201 {
3202         if (ifa_scope & IFA_HOST)
3203                 return RT_SCOPE_HOST;
3204         else if (ifa_scope & IFA_LINK)
3205                 return RT_SCOPE_LINK;
3206         else if (ifa_scope & IFA_SITE)
3207                 return RT_SCOPE_SITE;
3208         else
3209                 return RT_SCOPE_UNIVERSE;
3210 }
3211
3212 static inline int inet6_ifaddr_msgsize(void)
3213 {
3214         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3215                + nla_total_size(16) /* IFA_ADDRESS */
3216                + nla_total_size(sizeof(struct ifa_cacheinfo));
3217 }
3218
3219 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3220                              u32 pid, u32 seq, int event, unsigned int flags)
3221 {
3222         struct nlmsghdr  *nlh;
3223         u32 preferred, valid;
3224
3225         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3226         if (nlh == NULL)
3227                 return -EMSGSIZE;
3228
3229         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3230                       ifa->idev->dev->ifindex);
3231
3232         if (!(ifa->flags&IFA_F_PERMANENT)) {
3233                 preferred = ifa->prefered_lft;
3234                 valid = ifa->valid_lft;
3235                 if (preferred != INFINITY_LIFE_TIME) {
3236                         long tval = (jiffies - ifa->tstamp)/HZ;
3237                         preferred -= tval;
3238                         if (valid != INFINITY_LIFE_TIME)
3239                                 valid -= tval;
3240                 }
3241         } else {
3242                 preferred = INFINITY_LIFE_TIME;
3243                 valid = INFINITY_LIFE_TIME;
3244         }
3245
3246         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3247             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3248                 nlmsg_cancel(skb, nlh);
3249                 return -EMSGSIZE;
3250         }
3251
3252         return nlmsg_end(skb, nlh);
3253 }
3254
3255 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3256                                 u32 pid, u32 seq, int event, u16 flags)
3257 {
3258         struct nlmsghdr  *nlh;
3259         u8 scope = RT_SCOPE_UNIVERSE;
3260         int ifindex = ifmca->idev->dev->ifindex;
3261
3262         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3263                 scope = RT_SCOPE_SITE;
3264
3265         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3266         if (nlh == NULL)
3267                 return -EMSGSIZE;
3268
3269         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3270         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3271             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3272                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3273                 nlmsg_cancel(skb, nlh);
3274                 return -EMSGSIZE;
3275         }
3276
3277         return nlmsg_end(skb, nlh);
3278 }
3279
3280 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3281                                 u32 pid, u32 seq, int event, unsigned int flags)
3282 {
3283         struct nlmsghdr  *nlh;
3284         u8 scope = RT_SCOPE_UNIVERSE;
3285         int ifindex = ifaca->aca_idev->dev->ifindex;
3286
3287         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3288                 scope = RT_SCOPE_SITE;
3289
3290         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3291         if (nlh == NULL)
3292                 return -EMSGSIZE;
3293
3294         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3295         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3296             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3297                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3298                 nlmsg_cancel(skb, nlh);
3299                 return -EMSGSIZE;
3300         }
3301
3302         return nlmsg_end(skb, nlh);
3303 }
3304
3305 enum addr_type_t
3306 {
3307         UNICAST_ADDR,
3308         MULTICAST_ADDR,
3309         ANYCAST_ADDR,
3310 };
3311
3312 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3313                            enum addr_type_t type)
3314 {
3315         int idx, ip_idx;
3316         int s_idx, s_ip_idx;
3317         int err = 1;
3318         struct net_device *dev;
3319         struct inet6_dev *idev = NULL;
3320         struct inet6_ifaddr *ifa;
3321         struct ifmcaddr6 *ifmca;
3322         struct ifacaddr6 *ifaca;
3323
3324         s_idx = cb->args[0];
3325         s_ip_idx = ip_idx = cb->args[1];
3326
3327         idx = 0;
3328         for_each_netdev(&init_net, dev) {
3329                 if (idx < s_idx)
3330                         goto cont;
3331                 if (idx > s_idx)
3332                         s_ip_idx = 0;
3333                 ip_idx = 0;
3334                 if ((idev = in6_dev_get(dev)) == NULL)
3335                         goto cont;
3336                 read_lock_bh(&idev->lock);
3337                 switch (type) {
3338                 case UNICAST_ADDR:
3339                         /* unicast address incl. temp addr */
3340                         for (ifa = idev->addr_list; ifa;
3341                              ifa = ifa->if_next, ip_idx++) {
3342                                 if (ip_idx < s_ip_idx)
3343                                         continue;
3344                                 err = inet6_fill_ifaddr(skb, ifa,
3345                                                         NETLINK_CB(cb->skb).pid,
3346                                                         cb->nlh->nlmsg_seq,
3347                                                         RTM_NEWADDR,
3348                                                         NLM_F_MULTI);
3349                         }
3350                         break;
3351                 case MULTICAST_ADDR:
3352                         /* multicast address */
3353                         for (ifmca = idev->mc_list; ifmca;
3354                              ifmca = ifmca->next, ip_idx++) {
3355                                 if (ip_idx < s_ip_idx)
3356                                         continue;
3357                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3358                                                           NETLINK_CB(cb->skb).pid,
3359                                                           cb->nlh->nlmsg_seq,
3360                                                           RTM_GETMULTICAST,
3361                                                           NLM_F_MULTI);
3362                         }
3363                         break;
3364                 case ANYCAST_ADDR:
3365                         /* anycast address */
3366                         for (ifaca = idev->ac_list; ifaca;
3367                              ifaca = ifaca->aca_next, ip_idx++) {
3368                                 if (ip_idx < s_ip_idx)
3369                                         continue;
3370                                 err = inet6_fill_ifacaddr(skb, ifaca,
3371                                                           NETLINK_CB(cb->skb).pid,
3372                                                           cb->nlh->nlmsg_seq,
3373                                                           RTM_GETANYCAST,
3374                                                           NLM_F_MULTI);
3375                         }
3376                         break;
3377                 default:
3378                         break;
3379                 }
3380                 read_unlock_bh(&idev->lock);
3381                 in6_dev_put(idev);
3382
3383                 if (err <= 0)
3384                         break;
3385 cont:
3386                 idx++;
3387         }
3388         cb->args[0] = idx;
3389         cb->args[1] = ip_idx;
3390         return skb->len;
3391 }
3392
3393 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3394 {
3395         struct net *net = skb->sk->sk_net;
3396         enum addr_type_t type = UNICAST_ADDR;
3397
3398         if (net != &init_net)
3399                 return 0;
3400
3401         return inet6_dump_addr(skb, cb, type);
3402 }
3403
3404 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3405 {
3406         struct net *net = skb->sk->sk_net;
3407         enum addr_type_t type = MULTICAST_ADDR;
3408
3409         if (net != &init_net)
3410                 return 0;
3411
3412         return inet6_dump_addr(skb, cb, type);
3413 }
3414
3415
3416 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3417 {
3418         struct net *net = skb->sk->sk_net;
3419         enum addr_type_t type = ANYCAST_ADDR;
3420
3421         if (net != &init_net)
3422                 return 0;
3423
3424         return inet6_dump_addr(skb, cb, type);
3425 }
3426
3427 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3428                              void *arg)
3429 {
3430         struct net *net = in_skb->sk->sk_net;
3431         struct ifaddrmsg *ifm;
3432         struct nlattr *tb[IFA_MAX+1];
3433         struct in6_addr *addr = NULL;
3434         struct net_device *dev = NULL;
3435         struct inet6_ifaddr *ifa;
3436         struct sk_buff *skb;
3437         int err;
3438
3439         if (net != &init_net)
3440                 return -EINVAL;
3441
3442         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3443         if (err < 0)
3444                 goto errout;
3445
3446         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3447         if (addr == NULL) {
3448                 err = -EINVAL;
3449                 goto errout;
3450         }
3451
3452         ifm = nlmsg_data(nlh);
3453         if (ifm->ifa_index)
3454                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3455
3456         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3457                 err = -EADDRNOTAVAIL;
3458                 goto errout;
3459         }
3460
3461         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3462                 err = -ENOBUFS;
3463                 goto errout_ifa;
3464         }
3465
3466         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3467                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3468         if (err < 0) {
3469                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3470                 WARN_ON(err == -EMSGSIZE);
3471                 kfree_skb(skb);
3472                 goto errout_ifa;
3473         }
3474         err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3475 errout_ifa:
3476         in6_ifa_put(ifa);
3477 errout:
3478         return err;
3479 }
3480
3481 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3482 {
3483         struct sk_buff *skb;
3484         int err = -ENOBUFS;
3485
3486         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3487         if (skb == NULL)
3488                 goto errout;
3489
3490         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3491         if (err < 0) {
3492                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3493                 WARN_ON(err == -EMSGSIZE);
3494                 kfree_skb(skb);
3495                 goto errout;
3496         }
3497         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3498 errout:
3499         if (err < 0)
3500                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3501 }
3502
3503 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3504                                 __s32 *array, int bytes)
3505 {
3506         BUG_ON(bytes < (DEVCONF_MAX * 4));
3507
3508         memset(array, 0, bytes);
3509         array[DEVCONF_FORWARDING] = cnf->forwarding;
3510         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3511         array[DEVCONF_MTU6] = cnf->mtu6;
3512         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3513         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3514         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3515         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3516         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3517         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3518         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3519         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3520 #ifdef CONFIG_IPV6_PRIVACY
3521         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3522         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3523         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3524         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3525         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3526 #endif
3527         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3528         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3529         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3530 #ifdef CONFIG_IPV6_ROUTER_PREF
3531         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3532         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3533 #ifdef CONFIG_IPV6_ROUTE_INFO
3534         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3535 #endif
3536 #endif
3537         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3538         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3539 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3540         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3541 #endif
3542 }
3543
3544 static inline size_t inet6_if_nlmsg_size(void)
3545 {
3546         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3547                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3548                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3549                + nla_total_size(4) /* IFLA_MTU */
3550                + nla_total_size(4) /* IFLA_LINK */
3551                + nla_total_size( /* IFLA_PROTINFO */
3552                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3553                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3554                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3555                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3556                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3557                  );
3558 }
3559
3560 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3561                                       int bytes)
3562 {
3563         int i;
3564         int pad = bytes - sizeof(u64) * items;
3565         BUG_ON(pad < 0);
3566
3567         /* Use put_unaligned() because stats may not be aligned for u64. */
3568         put_unaligned(items, &stats[0]);
3569         for (i = 1; i < items; i++)
3570                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3571
3572         memset(&stats[items], 0, pad);
3573 }
3574
3575 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3576                              int bytes)
3577 {
3578         switch(attrtype) {
3579         case IFLA_INET6_STATS:
3580                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3581                 break;
3582         case IFLA_INET6_ICMP6STATS:
3583                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3584                 break;
3585         }
3586 }
3587
3588 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3589                              u32 pid, u32 seq, int event, unsigned int flags)
3590 {
3591         struct net_device *dev = idev->dev;
3592         struct nlattr *nla;
3593         struct ifinfomsg *hdr;
3594         struct nlmsghdr *nlh;
3595         void *protoinfo;
3596         struct ifla_cacheinfo ci;
3597
3598         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3599         if (nlh == NULL)
3600                 return -EMSGSIZE;
3601
3602         hdr = nlmsg_data(nlh);
3603         hdr->ifi_family = AF_INET6;
3604         hdr->__ifi_pad = 0;
3605         hdr->ifi_type = dev->type;
3606         hdr->ifi_index = dev->ifindex;
3607         hdr->ifi_flags = dev_get_flags(dev);
3608         hdr->ifi_change = 0;
3609
3610         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3611
3612         if (dev->addr_len)
3613                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3614
3615         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3616         if (dev->ifindex != dev->iflink)
3617                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3618
3619         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3620         if (protoinfo == NULL)
3621                 goto nla_put_failure;
3622
3623         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3624
3625         ci.max_reasm_len = IPV6_MAXPLEN;
3626         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3627                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3628         ci.reachable_time = idev->nd_parms->reachable_time;
3629         ci.retrans_time = idev->nd_parms->retrans_time;
3630         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3631
3632         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3633         if (nla == NULL)
3634                 goto nla_put_failure;
3635         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3636
3637         /* XXX - MC not implemented */
3638
3639         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3640         if (nla == NULL)
3641                 goto nla_put_failure;
3642         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3643
3644         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3645         if (nla == NULL)
3646                 goto nla_put_failure;
3647         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3648
3649         nla_nest_end(skb, protoinfo);
3650         return nlmsg_end(skb, nlh);
3651
3652 nla_put_failure:
3653         nlmsg_cancel(skb, nlh);
3654         return -EMSGSIZE;
3655 }
3656
3657 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3658 {
3659         struct net *net = skb->sk->sk_net;
3660         int idx, err;
3661         int s_idx = cb->args[0];
3662         struct net_device *dev;
3663         struct inet6_dev *idev;
3664
3665         if (net != &init_net)
3666                 return 0;
3667
3668         read_lock(&dev_base_lock);
3669         idx = 0;
3670         for_each_netdev(&init_net, dev) {
3671                 if (idx < s_idx)
3672                         goto cont;
3673                 if ((idev = in6_dev_get(dev)) == NULL)
3674                         goto cont;
3675                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3676                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3677                 in6_dev_put(idev);
3678                 if (err <= 0)
3679                         break;
3680 cont:
3681                 idx++;
3682         }
3683         read_unlock(&dev_base_lock);
3684         cb->args[0] = idx;
3685
3686         return skb->len;
3687 }
3688
3689 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3690 {
3691         struct sk_buff *skb;
3692         int err = -ENOBUFS;
3693
3694         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3695         if (skb == NULL)
3696                 goto errout;
3697
3698         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3699         if (err < 0) {
3700                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3701                 WARN_ON(err == -EMSGSIZE);
3702                 kfree_skb(skb);
3703                 goto errout;
3704         }
3705         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3706 errout:
3707         if (err < 0)
3708                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3709 }
3710
3711 static inline size_t inet6_prefix_nlmsg_size(void)
3712 {
3713         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3714                + nla_total_size(sizeof(struct in6_addr))
3715                + nla_total_size(sizeof(struct prefix_cacheinfo));
3716 }
3717
3718 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3719                              struct prefix_info *pinfo, u32 pid, u32 seq,
3720                              int event, unsigned int flags)
3721 {
3722         struct prefixmsg *pmsg;
3723         struct nlmsghdr *nlh;
3724         struct prefix_cacheinfo ci;
3725
3726         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3727         if (nlh == NULL)
3728                 return -EMSGSIZE;
3729
3730         pmsg = nlmsg_data(nlh);
3731         pmsg->prefix_family = AF_INET6;
3732         pmsg->prefix_pad1 = 0;
3733         pmsg->prefix_pad2 = 0;
3734         pmsg->prefix_ifindex = idev->dev->ifindex;
3735         pmsg->prefix_len = pinfo->prefix_len;
3736         pmsg->prefix_type = pinfo->type;
3737         pmsg->prefix_pad3 = 0;
3738         pmsg->prefix_flags = 0;
3739         if (pinfo->onlink)
3740                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3741         if (pinfo->autoconf)
3742                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3743
3744         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3745
3746         ci.preferred_time = ntohl(pinfo->prefered);
3747         ci.valid_time = ntohl(pinfo->valid);
3748         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3749
3750         return nlmsg_end(skb, nlh);
3751
3752 nla_put_failure:
3753         nlmsg_cancel(skb, nlh);
3754         return -EMSGSIZE;
3755 }
3756
3757 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3758                          struct prefix_info *pinfo)
3759 {
3760         struct sk_buff *skb;
3761         int err = -ENOBUFS;
3762
3763         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3764         if (skb == NULL)
3765                 goto errout;
3766
3767         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3768         if (err < 0) {
3769                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3770                 WARN_ON(err == -EMSGSIZE);
3771                 kfree_skb(skb);
3772                 goto errout;
3773         }
3774         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3775 errout:
3776         if (err < 0)
3777                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3778 }
3779
3780 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3781 {
3782         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3783
3784         switch (event) {
3785         case RTM_NEWADDR:
3786                 /*
3787                  * If the address was optimistic
3788                  * we inserted the route at the start of
3789                  * our DAD process, so we don't need
3790                  * to do it again
3791                  */
3792                 if (!(ifp->rt->rt6i_node))
3793                         ip6_ins_rt(ifp->rt);
3794                 if (ifp->idev->cnf.forwarding)
3795                         addrconf_join_anycast(ifp);
3796                 break;
3797         case RTM_DELADDR:
3798                 if (ifp->idev->cnf.forwarding)
3799                         addrconf_leave_anycast(ifp);
3800                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3801                 dst_hold(&ifp->rt->u.dst);
3802                 if (ip6_del_rt(ifp->rt))
3803                         dst_free(&ifp->rt->u.dst);
3804                 break;
3805         }
3806 }
3807
3808 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3809 {
3810         rcu_read_lock_bh();
3811         if (likely(ifp->idev->dead == 0))
3812                 __ipv6_ifa_notify(event, ifp);
3813         rcu_read_unlock_bh();
3814 }
3815
3816 #ifdef CONFIG_SYSCTL
3817
3818 static
3819 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3820                            void __user *buffer, size_t *lenp, loff_t *ppos)
3821 {
3822         int *valp = ctl->data;
3823         int val = *valp;
3824         int ret;
3825
3826         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3827
3828         if (write)
3829                 addrconf_fixup_forwarding(ctl, valp, val);
3830         return ret;
3831 }
3832
3833 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3834                                             int __user *name, int nlen,
3835                                             void __user *oldval,
3836                                             size_t __user *oldlenp,
3837                                             void __user *newval, size_t newlen)
3838 {
3839         int *valp = table->data;
3840         int val = *valp;
3841         int new;
3842
3843         if (!newval || !newlen)
3844                 return 0;
3845         if (newlen != sizeof(int))
3846                 return -EINVAL;
3847         if (get_user(new, (int __user *)newval))
3848                 return -EFAULT;
3849         if (new == *valp)
3850                 return 0;
3851         if (oldval && oldlenp) {
3852                 size_t len;
3853                 if (get_user(len, oldlenp))
3854                         return -EFAULT;
3855                 if (len) {
3856                         if (len > table->maxlen)
3857                                 len = table->maxlen;
3858                         if (copy_to_user(oldval, valp, len))
3859                                 return -EFAULT;
3860                         if (put_user(len, oldlenp))
3861                                 return -EFAULT;
3862                 }
3863         }
3864
3865         *valp = new;
3866         addrconf_fixup_forwarding(table, valp, val);
3867         return 1;
3868 }
3869
3870 static struct addrconf_sysctl_table
3871 {
3872         struct ctl_table_header *sysctl_header;
3873         ctl_table addrconf_vars[__NET_IPV6_MAX];
3874         char *dev_name;
3875 } addrconf_sysctl __read_mostly = {
3876         .sysctl_header = NULL,
3877         .addrconf_vars = {
3878                 {
3879                         .ctl_name       =       NET_IPV6_FORWARDING,
3880                         .procname       =       "forwarding",
3881                         .data           =       &ipv6_devconf.forwarding,
3882                         .maxlen         =       sizeof(int),
3883                         .mode           =       0644,
3884                         .proc_handler   =       &addrconf_sysctl_forward,
3885                         .strategy       =       &addrconf_sysctl_forward_strategy,
3886                 },
3887                 {
3888                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3889                         .procname       =       "hop_limit",
3890                         .data           =       &ipv6_devconf.hop_limit,
3891                         .maxlen         =       sizeof(int),
3892                         .mode           =       0644,
3893                         .proc_handler   =       proc_dointvec,
3894                 },
3895                 {
3896                         .ctl_name       =       NET_IPV6_MTU,
3897                         .procname       =       "mtu",
3898                         .data           =       &ipv6_devconf.mtu6,
3899                         .maxlen         =       sizeof(int),
3900                         .mode           =       0644,
3901                         .proc_handler   =       &proc_dointvec,
3902                 },
3903                 {
3904                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3905                         .procname       =       "accept_ra",
3906                         .data           =       &ipv6_devconf.accept_ra,
3907                         .maxlen         =       sizeof(int),
3908                         .mode           =       0644,
3909                         .proc_handler   =       &proc_dointvec,
3910                 },
3911                 {
3912                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3913                         .procname       =       "accept_redirects",
3914                         .data           =       &ipv6_devconf.accept_redirects,
3915                         .maxlen         =       sizeof(int),
3916                         .mode           =       0644,
3917                         .proc_handler   =       &proc_dointvec,
3918                 },
3919                 {
3920                         .ctl_name       =       NET_IPV6_AUTOCONF,
3921                         .procname       =       "autoconf",
3922                         .data           =       &ipv6_devconf.autoconf,
3923                         .maxlen         =       sizeof(int),
3924                         .mode           =       0644,
3925                         .proc_handler   =       &proc_dointvec,
3926                 },
3927                 {
3928                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3929                         .procname       =       "dad_transmits",
3930                         .data           =       &ipv6_devconf.dad_transmits,
3931                         .maxlen         =       sizeof(int),
3932                         .mode           =       0644,
3933                         .proc_handler   =       &proc_dointvec,
3934                 },
3935                 {
3936                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3937                         .procname       =       "router_solicitations",
3938                         .data           =       &ipv6_devconf.rtr_solicits,
3939                         .maxlen         =       sizeof(int),
3940                         .mode           =       0644,
3941                         .proc_handler   =       &proc_dointvec,
3942                 },
3943                 {
3944                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3945                         .procname       =       "router_solicitation_interval",
3946                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3947                         .maxlen         =       sizeof(int),
3948                         .mode           =       0644,
3949                         .proc_handler   =       &proc_dointvec_jiffies,
3950                         .strategy       =       &sysctl_jiffies,
3951                 },
3952                 {
3953                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3954                         .procname       =       "router_solicitation_delay",
3955                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3956                         .maxlen         =       sizeof(int),
3957                         .mode           =       0644,
3958                         .proc_handler   =       &proc_dointvec_jiffies,
3959                         .strategy       =       &sysctl_jiffies,
3960                 },
3961                 {
3962                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3963                         .procname       =       "force_mld_version",
3964                         .data           =       &ipv6_devconf.force_mld_version,
3965                         .maxlen         =       sizeof(int),
3966                         .mode           =       0644,
3967                         .proc_handler   =       &proc_dointvec,
3968                 },
3969 #ifdef CONFIG_IPV6_PRIVACY
3970                 {
3971                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3972                         .procname       =       "use_tempaddr",
3973                         .data           =       &ipv6_devconf.use_tempaddr,
3974                         .maxlen         =       sizeof(int),
3975                         .mode           =       0644,
3976                         .proc_handler   =       &proc_dointvec,
3977                 },
3978                 {
3979                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3980                         .procname       =       "temp_valid_lft",
3981                         .data           =       &ipv6_devconf.temp_valid_lft,
3982                         .maxlen         =       sizeof(int),
3983                         .mode           =       0644,
3984                         .proc_handler   =       &proc_dointvec,
3985                 },
3986                 {
3987                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3988                         .procname       =       "temp_prefered_lft",
3989                         .data           =       &ipv6_devconf.temp_prefered_lft,
3990                         .maxlen         =       sizeof(int),
3991                         .mode           =       0644,
3992                         .proc_handler   =       &proc_dointvec,
3993                 },
3994                 {
3995                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3996                         .procname       =       "regen_max_retry",
3997                         .data           =       &ipv6_devconf.regen_max_retry,
3998                         .maxlen         =       sizeof(int),
3999                         .mode           =       0644,
4000                         .proc_handler   =       &proc_dointvec,
4001                 },
4002                 {
4003                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4004                         .procname       =       "max_desync_factor",
4005                         .data           =       &ipv6_devconf.max_desync_factor,
4006                         .maxlen         =       sizeof(int),
4007                         .mode           =       0644,
4008                         .proc_handler   =       &proc_dointvec,
4009                 },
4010 #endif
4011                 {
4012                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4013                         .procname       =       "max_addresses",
4014                         .data           =       &ipv6_devconf.max_addresses,
4015                         .maxlen         =       sizeof(int),
4016                         .mode           =       0644,
4017                         .proc_handler   =       &proc_dointvec,
4018                 },
4019                 {
4020                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4021                         .procname       =       "accept_ra_defrtr",
4022                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4023                         .maxlen         =       sizeof(int),
4024                         .mode           =       0644,
4025                         .proc_handler   =       &proc_dointvec,
4026                 },
4027                 {
4028                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4029                         .procname       =       "accept_ra_pinfo",
4030                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4031                         .maxlen         =       sizeof(int),
4032                         .mode           =       0644,
4033                         .proc_handler   =       &proc_dointvec,
4034                 },
4035 #ifdef CONFIG_IPV6_ROUTER_PREF
4036                 {
4037                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4038                         .procname       =       "accept_ra_rtr_pref",
4039                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4040                         .maxlen         =       sizeof(int),
4041                         .mode           =       0644,
4042                         .proc_handler   =       &proc_dointvec,
4043                 },
4044                 {
4045                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4046                         .procname       =       "router_probe_interval",
4047                         .data           =       &ipv6_devconf.rtr_probe_interval,
4048                         .maxlen         =       sizeof(int),
4049                         .mode           =       0644,
4050                         .proc_handler   =       &proc_dointvec_jiffies,
4051                         .strategy       =       &sysctl_jiffies,
4052                 },
4053 #ifdef CONFIG_IPV6_ROUTE_INFO
4054                 {
4055                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4056                         .procname       =       "accept_ra_rt_info_max_plen",
4057                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4058                         .maxlen         =       sizeof(int),
4059                         .mode           =       0644,
4060                         .proc_handler   =       &proc_dointvec,
4061                 },
4062 #endif
4063 #endif
4064                 {
4065                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4066                         .procname       =       "proxy_ndp",
4067                         .data           =       &ipv6_devconf.proxy_ndp,
4068                         .maxlen         =       sizeof(int),
4069                         .mode           =       0644,
4070                         .proc_handler   =       &proc_dointvec,
4071                 },
4072                 {
4073                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4074                         .procname       =       "accept_source_route",
4075                         .data           =       &ipv6_devconf.accept_source_route,
4076                         .maxlen         =       sizeof(int),
4077                         .mode           =       0644,
4078                         .proc_handler   =       &proc_dointvec,
4079                 },
4080 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4081                 {
4082                         .ctl_name       =       CTL_UNNUMBERED,
4083                         .procname       =       "optimistic_dad",
4084                         .data           =       &ipv6_devconf.optimistic_dad,
4085                         .maxlen         =       sizeof(int),
4086                         .mode           =       0644,
4087                         .proc_handler   =       &proc_dointvec,
4088
4089                 },
4090 #endif
4091                 {
4092                         .ctl_name       =       0,      /* sentinel */
4093                 }
4094         },
4095 };
4096
4097 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4098                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4099 {
4100         int i;
4101         struct addrconf_sysctl_table *t;
4102
4103 #define ADDRCONF_CTL_PATH_DEV   3
4104
4105         struct ctl_path addrconf_ctl_path[] = {
4106                 { .procname = "net", .ctl_name = CTL_NET, },
4107                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4108                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4109                 { /* to be set */ },
4110                 { },
4111         };
4112
4113
4114         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4115         if (t == NULL)
4116                 goto out;
4117
4118         for (i=0; t->addrconf_vars[i].data; i++) {
4119                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4120                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4121                 t->addrconf_vars[i].extra2 = net;
4122         }
4123
4124         /*
4125          * Make a copy of dev_name, because '.procname' is regarded as const
4126          * by sysctl and we wouldn't want anyone to change it under our feet
4127          * (see SIOCSIFNAME).
4128          */
4129         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4130         if (!t->dev_name)
4131                 goto free;
4132
4133         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4134         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4135
4136         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4137                         t->addrconf_vars);
4138         if (t->sysctl_header == NULL)
4139                 goto free_procname;
4140
4141         p->sysctl = t;
4142         return 0;
4143
4144 free_procname:
4145         kfree(t->dev_name);
4146 free:
4147         kfree(t);
4148 out:
4149         return -ENOBUFS;
4150 }
4151
4152 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4153 {
4154         struct addrconf_sysctl_table *t;
4155
4156         if (p->sysctl == NULL)
4157                 return;
4158
4159         t = p->sysctl;
4160         p->sysctl = NULL;
4161         unregister_sysctl_table(t->sysctl_header);
4162         kfree(t->dev_name);
4163         kfree(t);
4164 }
4165
4166 static void addrconf_sysctl_register(struct inet6_dev *idev)
4167 {
4168         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4169                               NET_IPV6_NEIGH, "ipv6",
4170                               &ndisc_ifinfo_sysctl_change,
4171                               NULL);
4172         __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4173                         idev->dev->ifindex, idev, &idev->cnf);
4174 }
4175
4176 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4177 {
4178         __addrconf_sysctl_unregister(&idev->cnf);
4179         neigh_sysctl_unregister(idev->nd_parms);
4180 }
4181
4182
4183 #endif
4184
4185 static int addrconf_init_net(struct net *net)
4186 {
4187         int err;
4188         struct ipv6_devconf *all, *dflt;
4189
4190         err = -ENOMEM;
4191         all = &ipv6_devconf;
4192         dflt = &ipv6_devconf_dflt;
4193
4194         if (net != &init_net) {
4195                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4196                 if (all == NULL)
4197                         goto err_alloc_all;
4198
4199                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4200                 if (dflt == NULL)
4201                         goto err_alloc_dflt;
4202         }
4203
4204         net->ipv6.devconf_all = all;
4205         net->ipv6.devconf_dflt = dflt;
4206
4207 #ifdef CONFIG_SYSCTL
4208         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4209                         NULL, all);
4210         if (err < 0)
4211                 goto err_reg_all;
4212
4213         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4214                         NULL, dflt);
4215         if (err < 0)
4216                 goto err_reg_dflt;
4217 #endif
4218         return 0;
4219
4220 #ifdef CONFIG_SYSCTL
4221 err_reg_dflt:
4222         __addrconf_sysctl_unregister(all);
4223 err_reg_all:
4224         kfree(dflt);
4225 #endif
4226 err_alloc_dflt:
4227         kfree(all);
4228 err_alloc_all:
4229         return err;
4230 }
4231
4232 static void addrconf_exit_net(struct net *net)
4233 {
4234 #ifdef CONFIG_SYSCTL
4235         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4236         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4237 #endif
4238         if (net != &init_net) {
4239                 kfree(net->ipv6.devconf_dflt);
4240                 kfree(net->ipv6.devconf_all);
4241         }
4242 }
4243
4244 static struct pernet_operations addrconf_ops = {
4245         .init = addrconf_init_net,
4246         .exit = addrconf_exit_net,
4247 };
4248
4249 /*
4250  *      Device notifier
4251  */
4252
4253 int register_inet6addr_notifier(struct notifier_block *nb)
4254 {
4255         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4256 }
4257
4258 EXPORT_SYMBOL(register_inet6addr_notifier);
4259
4260 int unregister_inet6addr_notifier(struct notifier_block *nb)
4261 {
4262         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4263 }
4264
4265 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4266
4267 /*
4268  *      Init / cleanup code
4269  */
4270
4271 int __init addrconf_init(void)
4272 {
4273         int err;
4274
4275         if ((err = ipv6_addr_label_init()) < 0) {
4276                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4277                         err);
4278                 return err;
4279         }
4280
4281         register_pernet_subsys(&addrconf_ops);
4282
4283         /* The addrconf netdev notifier requires that loopback_dev
4284          * has it's ipv6 private information allocated and setup
4285          * before it can bring up and give link-local addresses
4286          * to other devices which are up.
4287          *
4288          * Unfortunately, loopback_dev is not necessarily the first
4289          * entry in the global dev_base list of net devices.  In fact,
4290          * it is likely to be the very last entry on that list.
4291          * So this causes the notifier registry below to try and
4292          * give link-local addresses to all devices besides loopback_dev
4293          * first, then loopback_dev, which cases all the non-loopback_dev
4294          * devices to fail to get a link-local address.
4295          *
4296          * So, as a temporary fix, allocate the ipv6 structure for
4297          * loopback_dev first by hand.
4298          * Longer term, all of the dependencies ipv6 has upon the loopback
4299          * device and it being up should be removed.
4300          */
4301         rtnl_lock();
4302         if (!ipv6_add_dev(init_net.loopback_dev))
4303                 err = -ENOMEM;
4304         rtnl_unlock();
4305         if (err)
4306                 goto errlo;
4307
4308         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4309         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4310 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4311         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4312         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4313         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4314         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4315 #endif
4316
4317         register_netdevice_notifier(&ipv6_dev_notf);
4318
4319         addrconf_verify(0);
4320
4321         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4322         if (err < 0)
4323                 goto errout;
4324
4325         /* Only the first call to __rtnl_register can fail */
4326         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4327         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4328         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4329         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4330         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4331
4332         ipv6_addr_label_rtnl_register();
4333
4334         return 0;
4335 errout:
4336         unregister_netdevice_notifier(&ipv6_dev_notf);
4337 errlo:
4338         unregister_pernet_subsys(&addrconf_ops);
4339
4340         return err;
4341 }
4342
4343 void addrconf_cleanup(void)
4344 {
4345         struct net_device *dev;
4346         struct inet6_ifaddr *ifa;
4347         int i;
4348
4349         unregister_netdevice_notifier(&ipv6_dev_notf);
4350
4351         unregister_pernet_subsys(&addrconf_ops);
4352
4353         rtnl_lock();
4354
4355         /*
4356          *      clean dev list.
4357          */
4358
4359         for_each_netdev(&init_net, dev) {
4360                 if (__in6_dev_get(dev) == NULL)
4361                         continue;
4362                 addrconf_ifdown(dev, 1);
4363         }
4364         addrconf_ifdown(init_net.loopback_dev, 2);
4365
4366         /*
4367          *      Check hash table.
4368          */
4369
4370         write_lock_bh(&addrconf_hash_lock);
4371         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4372                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4373                         struct inet6_ifaddr *bifa;
4374
4375                         bifa = ifa;
4376                         ifa = ifa->lst_next;
4377                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4378                         /* Do not free it; something is wrong.
4379                            Now we can investigate it with debugger.
4380                          */
4381                 }
4382         }
4383         write_unlock_bh(&addrconf_hash_lock);
4384
4385         del_timer(&addr_chk_timer);
4386
4387         rtnl_unlock();
4388 }