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   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <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 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 375         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 376                 printk(KERN_INFO
 377                        "%s: Disabled Multicast RS\n",
 378                        dev->name);
 379                 ndev->cnf.rtr_solicits = 0;
 380         }
 381 #endif
 382
 383 #ifdef CONFIG_IPV6_PRIVACY
 384         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 385         if ((dev->flags&IFF_LOOPBACK) ||
 386             dev->type == ARPHRD_TUNNEL ||
 387 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 388             dev->type == ARPHRD_SIT ||
 389 #endif
 390             dev->type == ARPHRD_NONE) {
 391                 printk(KERN_INFO
 392                        "%s: Disabled Privacy Extensions\n",
 393                        dev->name);
 394                 ndev->cnf.use_tempaddr = -1;
 395         } else {
 396                 in6_dev_hold(ndev);
 397                 ipv6_regen_rndid((unsigned long) ndev);
 398         }
 399 #endif
 400
 401         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 402                 ndev->if_flags |= IF_READY;
 403
 404         ipv6_mc_init_dev(ndev);
 405         ndev->tstamp = jiffies;
 406         addrconf_sysctl_register(ndev);
 407         /* protected by rtnl_lock */
 408         rcu_assign_pointer(dev->ip6_ptr, ndev);
 409
 410         /* Join all-node multicast group */
 411         ipv6_addr_all_nodes(&maddr);
 412         ipv6_dev_mc_inc(dev, &maddr);
 413
 414         return ndev;
 415 }
 416
 417 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 418 {
 419         struct inet6_dev *idev;
 420
 421         ASSERT_RTNL();
 422
 423         if ((idev = __in6_dev_get(dev)) == NULL) {
 424                 if ((idev = ipv6_add_dev(dev)) == NULL)
 425                         return NULL;
 426         }
 427
 428         if (dev->flags&IFF_UP)
 429                 ipv6_mc_up(idev);
 430         return idev;
 431 }
 432
 433 #ifdef CONFIG_SYSCTL
 434 static void dev_forward_change(struct inet6_dev *idev)
 435 {
 436         struct net_device *dev;
 437         struct inet6_ifaddr *ifa;
 438         struct in6_addr addr;
 439
 440         if (!idev)
 441                 return;
 442         dev = idev->dev;
 443         if (dev && (dev->flags & IFF_MULTICAST)) {
 444                 ipv6_addr_all_routers(&addr);
 445
 446                 if (idev->cnf.forwarding)
 447                         ipv6_dev_mc_inc(dev, &addr);
 448                 else
 449                         ipv6_dev_mc_dec(dev, &addr);
 450         }
 451         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 452                 if (ifa->flags&IFA_F_TENTATIVE)
 453                         continue;
 454                 if (idev->cnf.forwarding)
 455                         addrconf_join_anycast(ifa);
 456                 else
 457                         addrconf_leave_anycast(ifa);
 458         }
 459 }
 460
 461
 462 static void addrconf_forward_change(struct net *net, __s32 newf)
 463 {
 464         struct net_device *dev;
 465         struct inet6_dev *idev;
 466
 467         read_lock(&dev_base_lock);
 468         for_each_netdev(net, dev) {
 469                 rcu_read_lock();
 470                 idev = __in6_dev_get(dev);
 471                 if (idev) {
 472                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 473                         idev->cnf.forwarding = newf;
 474                         if (changed)
 475                                 dev_forward_change(idev);
 476                 }
 477                 rcu_read_unlock();
 478         }
 479         read_unlock(&dev_base_lock);
 480 }
 481
 482 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 483 {
 484         struct net *net;
 485
 486         net = (struct net *)table->extra2;
 487         if (p == &net->ipv6.devconf_dflt->forwarding)
 488                 return;
 489
 490         if (p == &net->ipv6.devconf_all->forwarding) {
 491                 __s32 newf = net->ipv6.devconf_all->forwarding;
 492                 net->ipv6.devconf_dflt->forwarding = newf;
 493                 addrconf_forward_change(net, newf);
 494         } else if ((!*p) ^ (!old))
 495                 dev_forward_change((struct inet6_dev *)table->extra1);
 496
 497         if (*p)
 498                 rt6_purge_dflt_routers();
 499 }
 500 #endif
 501
 502 /* Nobody refers to this ifaddr, destroy it */
 503
 504 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 505 {
 506         BUG_TRAP(ifp->if_next==NULL);
 507         BUG_TRAP(ifp->lst_next==NULL);
 508 #ifdef NET_REFCNT_DEBUG
 509         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 510 #endif
 511
 512         in6_dev_put(ifp->idev);
 513
 514         if (del_timer(&ifp->timer))
 515                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 516
 517         if (!ifp->dead) {
 518                 printk("Freeing alive inet6 address %p\n", ifp);
 519                 return;
 520         }
 521         dst_release(&ifp->rt->u.dst);
 522
 523         kfree(ifp);
 524 }
 525
 526 static void
 527 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 528 {
 529         struct inet6_ifaddr *ifa, **ifap;
 530         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 531
 532         /*
 533          * Each device address list is sorted in order of scope -
 534          * global before linklocal.
 535          */
 536         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 537              ifap = &ifa->if_next) {
 538                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 539                         break;
 540         }
 541
 542         ifp->if_next = *ifap;
 543         *ifap = ifp;
 544 }
 545
 546 /* On success it returns ifp with increased reference count */
 547
 548 static struct inet6_ifaddr *
 549 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 550               int scope, u32 flags)
 551 {
 552         struct inet6_ifaddr *ifa = NULL;
 553         struct rt6_info *rt;
 554         int hash;
 555         int err = 0;
 556
 557         rcu_read_lock_bh();
 558         if (idev->dead) {
 559                 err = -ENODEV;                  /*XXX*/
 560                 goto out2;
 561         }
 562
 563         write_lock(&addrconf_hash_lock);
 564
 565         /* Ignore adding duplicate addresses on an interface */
 566         if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
 567                 ADBG(("ipv6_add_addr: already assigned\n"));
 568                 err = -EEXIST;
 569                 goto out;
 570         }
 571
 572         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 573
 574         if (ifa == NULL) {
 575                 ADBG(("ipv6_add_addr: malloc failed\n"));
 576                 err = -ENOBUFS;
 577                 goto out;
 578         }
 579
 580         rt = addrconf_dst_alloc(idev, addr, 0);
 581         if (IS_ERR(rt)) {
 582                 err = PTR_ERR(rt);
 583                 goto out;
 584         }
 585
 586         ipv6_addr_copy(&ifa->addr, addr);
 587
 588         spin_lock_init(&ifa->lock);
 589         init_timer(&ifa->timer);
 590         ifa->timer.data = (unsigned long) ifa;
 591         ifa->scope = scope;
 592         ifa->prefix_len = pfxlen;
 593         ifa->flags = flags | IFA_F_TENTATIVE;
 594         ifa->cstamp = ifa->tstamp = jiffies;
 595
 596         ifa->rt = rt;
 597
 598         /*
 599          * part one of RFC 4429, section 3.3
 600          * We should not configure an address as
 601          * optimistic if we do not yet know the link
 602          * layer address of our nexhop router
 603          */
 604
 605         if (rt->rt6i_nexthop == NULL)
 606                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 607
 608         ifa->idev = idev;
 609         in6_dev_hold(idev);
 610         /* For caller */
 611         in6_ifa_hold(ifa);
 612
 613         /* Add to big hash table */
 614         hash = ipv6_addr_hash(addr);
 615
 616         ifa->lst_next = inet6_addr_lst[hash];
 617         inet6_addr_lst[hash] = ifa;
 618         in6_ifa_hold(ifa);
 619         write_unlock(&addrconf_hash_lock);
 620
 621         write_lock(&idev->lock);
 622         /* Add to inet6_dev unicast addr list. */
 623         ipv6_link_dev_addr(idev, ifa);
 624
 625 #ifdef CONFIG_IPV6_PRIVACY
 626         if (ifa->flags&IFA_F_TEMPORARY) {
 627                 ifa->tmp_next = idev->tempaddr_list;
 628                 idev->tempaddr_list = ifa;
 629                 in6_ifa_hold(ifa);
 630         }
 631 #endif
 632
 633         in6_ifa_hold(ifa);
 634         write_unlock(&idev->lock);
 635 out2:
 636         rcu_read_unlock_bh();
 637
 638         if (likely(err == 0))
 639                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 640         else {
 641                 kfree(ifa);
 642                 ifa = ERR_PTR(err);
 643         }
 644
 645         return ifa;
 646 out:
 647         write_unlock(&addrconf_hash_lock);
 648         goto out2;
 649 }
 650
 651 /* This function wants to get referenced ifp and releases it before return */
 652
 653 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 654 {
 655         struct inet6_ifaddr *ifa, **ifap;
 656         struct inet6_dev *idev = ifp->idev;
 657         int hash;
 658         int deleted = 0, onlink = 0;
 659         unsigned long expires = jiffies;
 660
 661         hash = ipv6_addr_hash(&ifp->addr);
 662
 663         ifp->dead = 1;
 664
 665         write_lock_bh(&addrconf_hash_lock);
 666         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 667              ifap = &ifa->lst_next) {
 668                 if (ifa == ifp) {
 669                         *ifap = ifa->lst_next;
 670                         __in6_ifa_put(ifp);
 671                         ifa->lst_next = NULL;
 672                         break;
 673                 }
 674         }
 675         write_unlock_bh(&addrconf_hash_lock);
 676
 677         write_lock_bh(&idev->lock);
 678 #ifdef CONFIG_IPV6_PRIVACY
 679         if (ifp->flags&IFA_F_TEMPORARY) {
 680                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 681                      ifap = &ifa->tmp_next) {
 682                         if (ifa == ifp) {
 683                                 *ifap = ifa->tmp_next;
 684                                 if (ifp->ifpub) {
 685                                         in6_ifa_put(ifp->ifpub);
 686                                         ifp->ifpub = NULL;
 687                                 }
 688                                 __in6_ifa_put(ifp);
 689                                 ifa->tmp_next = NULL;
 690                                 break;
 691                         }
 692                 }
 693         }
 694 #endif
 695
 696         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 697                 if (ifa == ifp) {
 698                         *ifap = ifa->if_next;
 699                         __in6_ifa_put(ifp);
 700                         ifa->if_next = NULL;
 701                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 702                                 break;
 703                         deleted = 1;
 704                         continue;
 705                 } else if (ifp->flags & IFA_F_PERMANENT) {
 706                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 707                                               ifp->prefix_len)) {
 708                                 if (ifa->flags & IFA_F_PERMANENT) {
 709                                         onlink = 1;
 710                                         if (deleted)
 711                                                 break;
 712                                 } else {
 713                                         unsigned long lifetime;
 714
 715                                         if (!onlink)
 716                                                 onlink = -1;
 717
 718                                         spin_lock(&ifa->lock);
 719                                         lifetime = min_t(unsigned long,
 720                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 721                                         if (time_before(expires,
 722                                                         ifa->tstamp + lifetime * HZ))
 723                                                 expires = ifa->tstamp + lifetime * HZ;
 724                                         spin_unlock(&ifa->lock);
 725                                 }
 726                         }
 727                 }
 728                 ifap = &ifa->if_next;
 729         }
 730         write_unlock_bh(&idev->lock);
 731
 732         ipv6_ifa_notify(RTM_DELADDR, ifp);
 733
 734         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 735
 736         addrconf_del_timer(ifp);
 737
 738         /*
 739          * Purge or update corresponding prefix
 740          *
 741          * 1) we don't purge prefix here if address was not permanent.
 742          *    prefix is managed by its own lifetime.
 743          * 2) if there're no addresses, delete prefix.
 744          * 3) if there're still other permanent address(es),
 745          *    corresponding prefix is still permanent.
 746          * 4) otherwise, update prefix lifetime to the
 747          *    longest valid lifetime among the corresponding
 748          *    addresses on the device.
 749          *    Note: subsequent RA will update lifetime.
 750          *
 751          * --yoshfuji
 752          */
 753         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 754                 struct in6_addr prefix;
 755                 struct rt6_info *rt;
 756
 757                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 758                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 759
 760                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 761                         if (onlink == 0) {
 762                                 ip6_del_rt(rt);
 763                                 rt = NULL;
 764                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 765                                 rt->rt6i_expires = expires;
 766                                 rt->rt6i_flags |= RTF_EXPIRES;
 767                         }
 768                 }
 769                 dst_release(&rt->u.dst);
 770         }
 771
 772         in6_ifa_put(ifp);
 773 }
 774
 775 #ifdef CONFIG_IPV6_PRIVACY
 776 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 777 {
 778         struct inet6_dev *idev = ifp->idev;
 779         struct in6_addr addr, *tmpaddr;
 780         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 781         unsigned long regen_advance;
 782         int tmp_plen;
 783         int ret = 0;
 784         int max_addresses;
 785         u32 addr_flags;
 786
 787         write_lock(&idev->lock);
 788         if (ift) {
 789                 spin_lock_bh(&ift->lock);
 790                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 791                 spin_unlock_bh(&ift->lock);
 792                 tmpaddr = &addr;
 793         } else {
 794                 tmpaddr = NULL;
 795         }
 796 retry:
 797         in6_dev_hold(idev);
 798         if (idev->cnf.use_tempaddr <= 0) {
 799                 write_unlock(&idev->lock);
 800                 printk(KERN_INFO
 801                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 802                 in6_dev_put(idev);
 803                 ret = -1;
 804                 goto out;
 805         }
 806         spin_lock_bh(&ifp->lock);
 807         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 808                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 809                 spin_unlock_bh(&ifp->lock);
 810                 write_unlock(&idev->lock);
 811                 printk(KERN_WARNING
 812                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 813                 in6_dev_put(idev);
 814                 ret = -1;
 815                 goto out;
 816         }
 817         in6_ifa_hold(ifp);
 818         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 819         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 820                 spin_unlock_bh(&ifp->lock);
 821                 write_unlock(&idev->lock);
 822                 printk(KERN_WARNING
 823                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 824                 in6_ifa_put(ifp);
 825                 in6_dev_put(idev);
 826                 ret = -1;
 827                 goto out;
 828         }
 829         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 830         tmp_valid_lft = min_t(__u32,
 831                               ifp->valid_lft,
 832                               idev->cnf.temp_valid_lft);
 833         tmp_prefered_lft = min_t(__u32,
 834                                  ifp->prefered_lft,
 835                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 836         tmp_plen = ifp->prefix_len;
 837         max_addresses = idev->cnf.max_addresses;
 838         tmp_cstamp = ifp->cstamp;
 839         tmp_tstamp = ifp->tstamp;
 840         spin_unlock_bh(&ifp->lock);
 841
 842         regen_advance = idev->cnf.regen_max_retry *
 843                         idev->cnf.dad_transmits *
 844                         idev->nd_parms->retrans_time / HZ;
 845         write_unlock(&idev->lock);
 846
 847         /* A temporary address is created only if this calculated Preferred
 848          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 849          * an implementation must not create a temporary address with a zero
 850          * Preferred Lifetime.
 851          */
 852         if (tmp_prefered_lft <= regen_advance) {
 853                 in6_ifa_put(ifp);
 854                 in6_dev_put(idev);
 855                 ret = -1;
 856                 goto out;
 857         }
 858
 859         addr_flags = IFA_F_TEMPORARY;
 860         /* set in addrconf_prefix_rcv() */
 861         if (ifp->flags & IFA_F_OPTIMISTIC)
 862                 addr_flags |= IFA_F_OPTIMISTIC;
 863
 864         ift = !max_addresses ||
 865               ipv6_count_addresses(idev) < max_addresses ?
 866                 ipv6_add_addr(idev, &addr, tmp_plen,
 867                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 868                               addr_flags) : NULL;
 869         if (!ift || IS_ERR(ift)) {
 870                 in6_ifa_put(ifp);
 871                 in6_dev_put(idev);
 872                 printk(KERN_INFO
 873                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 874                 tmpaddr = &addr;
 875                 write_lock(&idev->lock);
 876                 goto retry;
 877         }
 878
 879         spin_lock_bh(&ift->lock);
 880         ift->ifpub = ifp;
 881         ift->valid_lft = tmp_valid_lft;
 882         ift->prefered_lft = tmp_prefered_lft;
 883         ift->cstamp = tmp_cstamp;
 884         ift->tstamp = tmp_tstamp;
 885         spin_unlock_bh(&ift->lock);
 886
 887         addrconf_dad_start(ift, 0);
 888         in6_ifa_put(ift);
 889         in6_dev_put(idev);
 890 out:
 891         return ret;
 892 }
 893 #endif
 894
 895 /*
 896  *      Choose an appropriate source address (RFC3484)
 897  */
 898 struct ipv6_saddr_score {
 899         int             addr_type;
 900         unsigned int    attrs;
 901         int             matchlen;
 902         int             scope;
 903         unsigned int    rule;
 904 };
 905
 906 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 907 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 908 #define IPV6_SADDR_SCORE_HOA            0x0008
 909 #define IPV6_SADDR_SCORE_OIF            0x0010
 910 #define IPV6_SADDR_SCORE_LABEL          0x0020
 911 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 912
 913 static inline int ipv6_saddr_preferred(int type)
 914 {
 915         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 916                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 917                 return 1;
 918         return 0;
 919 }
 920
 921 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 922                        struct in6_addr *daddr, struct in6_addr *saddr)
 923 {
 924         struct ipv6_saddr_score hiscore;
 925         struct inet6_ifaddr *ifa_result = NULL;
 926         int daddr_type = __ipv6_addr_type(daddr);
 927         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 928         int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
 929         u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
 930         struct net_device *dev;
 931
 932         memset(&hiscore, 0, sizeof(hiscore));
 933
 934         read_lock(&dev_base_lock);
 935         rcu_read_lock();
 936
 937         for_each_netdev(&init_net, dev) {
 938                 struct inet6_dev *idev;
 939                 struct inet6_ifaddr *ifa;
 940
 941                 /* Rule 0: Candidate Source Address (section 4)
 942                  *  - multicast and link-local destination address,
 943                  *    the set of candidate source address MUST only
 944                  *    include addresses assigned to interfaces
 945                  *    belonging to the same link as the outgoing
 946                  *    interface.
 947                  * (- For site-local destination addresses, the
 948                  *    set of candidate source addresses MUST only
 949                  *    include addresses assigned to interfaces
 950                  *    belonging to the same site as the outgoing
 951                  *    interface.)
 952                  */
 953                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 954                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 955                     daddr_dev && dev != daddr_dev)
 956                         continue;
 957
 958                 idev = __in6_dev_get(dev);
 959                 if (!idev)
 960                         continue;
 961
 962                 read_lock_bh(&idev->lock);
 963                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 964                         struct ipv6_saddr_score score;
 965
 966                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 967
 968                         /* Rule 0:
 969                          * - Tentative Address (RFC2462 section 5.4)
 970                          *  - A tentative address is not considered
 971                          *    "assigned to an interface" in the traditional
 972                          *    sense, unless it is also flagged as optimistic.
 973                          * - Candidate Source Address (section 4)
 974                          *  - In any case, anycast addresses, multicast
 975                          *    addresses, and the unspecified address MUST
 976                          *    NOT be included in a candidate set.
 977                          */
 978                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 979                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 980                                 continue;
 981                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 982                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 983                                 LIMIT_NETDEBUG(KERN_DEBUG
 984                                                "ADDRCONF: unspecified / multicast address "
 985                                                "assigned as unicast address on %s",
 986                                                dev->name);
 987                                 continue;
 988                         }
 989
 990                         score.attrs = 0;
 991                         score.matchlen = 0;
 992                         score.scope = 0;
 993                         score.rule = 0;
 994
 995                         if (ifa_result == NULL) {
 996                                 /* record it if the first available entry */
 997                                 goto record_it;
 998                         }
 999
1000                         /* Rule 1: Prefer same address */
1001                         if (hiscore.rule < 1) {
1002                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
1003                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
1004                                 hiscore.rule++;
1005                         }
1006                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
1007                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
1008                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1009                                         score.rule = 1;
1010                                         goto record_it;
1011                                 }
1012                         } else {
1013                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1014                                         continue;
1015                         }
1016
1017                         /* Rule 2: Prefer appropriate scope */
1018                         if (hiscore.rule < 2) {
1019                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1020                                 hiscore.rule++;
1021                         }
1022                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1023                         if (hiscore.scope < score.scope) {
1024                                 if (hiscore.scope < daddr_scope) {
1025                                         score.rule = 2;
1026                                         goto record_it;
1027                                 } else
1028                                         continue;
1029                         } else if (score.scope < hiscore.scope) {
1030                                 if (score.scope < daddr_scope)
1031                                         break; /* addresses sorted by scope */
1032                                 else {
1033                                         score.rule = 2;
1034                                         goto record_it;
1035                                 }
1036                         }
1037
1038                         /* Rule 3: Avoid deprecated and optimistic addresses */
1039                         if (hiscore.rule < 3) {
1040                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1041                                    (((ifa_result->flags &
1042                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1043                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1044                                 hiscore.rule++;
1045                         }
1046                         if (ipv6_saddr_preferred(score.addr_type) ||
1047                            (((ifa->flags &
1048                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1049                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1050                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1051                                         score.rule = 3;
1052                                         goto record_it;
1053                                 }
1054                         } else {
1055                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1056                                         continue;
1057                         }
1058
1059                         /* Rule 4: Prefer home address */
1060 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1061                         if (hiscore.rule < 4) {
1062                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1063                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1064                                 hiscore.rule++;
1065                         }
1066                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1067                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1068                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1069                                         score.rule = 4;
1070                                         goto record_it;
1071                                 }
1072                         } else {
1073                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1074                                         continue;
1075                         }
1076 #else
1077                         if (hiscore.rule < 4)
1078                                 hiscore.rule++;
1079 #endif
1080
1081                         /* Rule 5: Prefer outgoing interface */
1082                         if (hiscore.rule < 5) {
1083                                 if (daddr_dev == NULL ||
1084                                     daddr_dev == ifa_result->idev->dev)
1085                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1086                                 hiscore.rule++;
1087                         }
1088                         if (daddr_dev == NULL ||
1089                             daddr_dev == ifa->idev->dev) {
1090                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1091                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1092                                         score.rule = 5;
1093                                         goto record_it;
1094                                 }
1095                         } else {
1096                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1097                                         continue;
1098                         }
1099
1100                         /* Rule 6: Prefer matching label */
1101                         if (hiscore.rule < 6) {
1102                                 if (ipv6_addr_label(&ifa_result->addr,
1103                                                     hiscore.addr_type,
1104                                                     ifa_result->idev->dev->ifindex) == daddr_label)
1105                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1106                                 hiscore.rule++;
1107                         }
1108                         if (ipv6_addr_label(&ifa->addr,
1109                                             score.addr_type,
1110                                             ifa->idev->dev->ifindex) == daddr_label) {
1111                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1112                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1113                                         score.rule = 6;
1114                                         goto record_it;
1115                                 }
1116                         } else {
1117                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1118                                         continue;
1119                         }
1120
1121 #ifdef CONFIG_IPV6_PRIVACY
1122                         /* Rule 7: Prefer public address
1123                          * Note: prefer temprary address if use_tempaddr >= 2
1124                          */
1125                         if (hiscore.rule < 7) {
1126                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1127                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1128                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1129                                 hiscore.rule++;
1130                         }
1131                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1132                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1133                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1134                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1135                                         score.rule = 7;
1136                                         goto record_it;
1137                                 }
1138                         } else {
1139                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1140                                         continue;
1141                         }
1142 #else
1143                         if (hiscore.rule < 7)
1144                                 hiscore.rule++;
1145 #endif
1146                         /* Rule 8: Use longest matching prefix */
1147                         if (hiscore.rule < 8) {
1148                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1149                                 hiscore.rule++;
1150                         }
1151                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1152                         if (score.matchlen > hiscore.matchlen) {
1153                                 score.rule = 8;
1154                                 goto record_it;
1155                         }
1156 #if 0
1157                         else if (score.matchlen < hiscore.matchlen)
1158                                 continue;
1159 #endif
1160
1161                         /* Final Rule: choose first available one */
1162                         continue;
1163 record_it:
1164                         if (ifa_result)
1165                                 in6_ifa_put(ifa_result);
1166                         in6_ifa_hold(ifa);
1167                         ifa_result = ifa;
1168                         hiscore = score;
1169                 }
1170                 read_unlock_bh(&idev->lock);
1171         }
1172         rcu_read_unlock();
1173         read_unlock(&dev_base_lock);
1174
1175         if (!ifa_result)
1176                 return -EADDRNOTAVAIL;
1177
1178         ipv6_addr_copy(saddr, &ifa_result->addr);
1179         in6_ifa_put(ifa_result);
1180         return 0;
1181 }
1182
1183
1184 int ipv6_get_saddr(struct dst_entry *dst,
1185                    struct in6_addr *daddr, struct in6_addr *saddr)
1186 {
1187         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1188 }
1189
1190 EXPORT_SYMBOL(ipv6_get_saddr);
1191
1192 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1193                     unsigned char banned_flags)
1194 {
1195         struct inet6_dev *idev;
1196         int err = -EADDRNOTAVAIL;
1197
1198         rcu_read_lock();
1199         if ((idev = __in6_dev_get(dev)) != NULL) {
1200                 struct inet6_ifaddr *ifp;
1201
1202                 read_lock_bh(&idev->lock);
1203                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1204                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1205                                 ipv6_addr_copy(addr, &ifp->addr);
1206                                 err = 0;
1207                                 break;
1208                         }
1209                 }
1210                 read_unlock_bh(&idev->lock);
1211         }
1212         rcu_read_unlock();
1213         return err;
1214 }
1215
1216 static int ipv6_count_addresses(struct inet6_dev *idev)
1217 {
1218         int cnt = 0;
1219         struct inet6_ifaddr *ifp;
1220
1221         read_lock_bh(&idev->lock);
1222         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1223                 cnt++;
1224         read_unlock_bh(&idev->lock);
1225         return cnt;
1226 }
1227
1228 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1229                   struct net_device *dev, int strict)
1230 {
1231         struct inet6_ifaddr * ifp;
1232         u8 hash = ipv6_addr_hash(addr);
1233
1234         read_lock_bh(&addrconf_hash_lock);
1235         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1236                 if (ifp->idev->dev->nd_net != net)
1237                         continue;
1238                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1239                     !(ifp->flags&IFA_F_TENTATIVE)) {
1240                         if (dev == NULL || ifp->idev->dev == dev ||
1241                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1242                                 break;
1243                 }
1244         }
1245         read_unlock_bh(&addrconf_hash_lock);
1246         return ifp != NULL;
1247 }
1248 EXPORT_SYMBOL(ipv6_chk_addr);
1249
1250 static
1251 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1252                        struct net_device *dev)
1253 {
1254         struct inet6_ifaddr * ifp;
1255         u8 hash = ipv6_addr_hash(addr);
1256
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                                 break;
1263                 }
1264         }
1265         return ifp != NULL;
1266 }
1267
1268 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1269                                      struct net_device *dev, int strict)
1270 {
1271         struct inet6_ifaddr * ifp;
1272         u8 hash = ipv6_addr_hash(addr);
1273
1274         read_lock_bh(&addrconf_hash_lock);
1275         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1276                 if (ifp->idev->dev->nd_net != net)
1277                         continue;
1278                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1279                         if (dev == NULL || ifp->idev->dev == dev ||
1280                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1281                                 in6_ifa_hold(ifp);
1282                                 break;
1283                         }
1284                 }
1285         }
1286         read_unlock_bh(&addrconf_hash_lock);
1287
1288         return ifp;
1289 }
1290
1291 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1292 {
1293         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1294         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1295         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1296         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1297         int sk_ipv6only = ipv6_only_sock(sk);
1298         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1299         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1300         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1301
1302         if (!sk2_rcv_saddr && !sk_ipv6only)
1303                 return 1;
1304
1305         if (addr_type2 == IPV6_ADDR_ANY &&
1306             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1307                 return 1;
1308
1309         if (addr_type == IPV6_ADDR_ANY &&
1310             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1311                 return 1;
1312
1313         if (sk2_rcv_saddr6 &&
1314             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1315                 return 1;
1316
1317         if (addr_type == IPV6_ADDR_MAPPED &&
1318             !sk2_ipv6only &&
1319             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1320                 return 1;
1321
1322         return 0;
1323 }
1324
1325 /* Gets referenced address, destroys ifaddr */
1326
1327 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1328 {
1329         if (ifp->flags&IFA_F_PERMANENT) {
1330                 spin_lock_bh(&ifp->lock);
1331                 addrconf_del_timer(ifp);
1332                 ifp->flags |= IFA_F_TENTATIVE;
1333                 spin_unlock_bh(&ifp->lock);
1334                 in6_ifa_put(ifp);
1335 #ifdef CONFIG_IPV6_PRIVACY
1336         } else if (ifp->flags&IFA_F_TEMPORARY) {
1337                 struct inet6_ifaddr *ifpub;
1338                 spin_lock_bh(&ifp->lock);
1339                 ifpub = ifp->ifpub;
1340                 if (ifpub) {
1341                         in6_ifa_hold(ifpub);
1342                         spin_unlock_bh(&ifp->lock);
1343                         ipv6_create_tempaddr(ifpub, ifp);
1344                         in6_ifa_put(ifpub);
1345                 } else {
1346                         spin_unlock_bh(&ifp->lock);
1347                 }
1348                 ipv6_del_addr(ifp);
1349 #endif
1350         } else
1351                 ipv6_del_addr(ifp);
1352 }
1353
1354 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1355 {
1356         if (net_ratelimit())
1357                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1358         addrconf_dad_stop(ifp);
1359 }
1360
1361 /* Join to solicited addr multicast group. */
1362
1363 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1364 {
1365         struct in6_addr maddr;
1366
1367         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1368                 return;
1369
1370         addrconf_addr_solict_mult(addr, &maddr);
1371         ipv6_dev_mc_inc(dev, &maddr);
1372 }
1373
1374 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1375 {
1376         struct in6_addr maddr;
1377
1378         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1379                 return;
1380
1381         addrconf_addr_solict_mult(addr, &maddr);
1382         __ipv6_dev_mc_dec(idev, &maddr);
1383 }
1384
1385 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1386 {
1387         struct in6_addr addr;
1388         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1389         if (ipv6_addr_any(&addr))
1390                 return;
1391         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1392 }
1393
1394 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1395 {
1396         struct in6_addr addr;
1397         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1398         if (ipv6_addr_any(&addr))
1399                 return;
1400         __ipv6_dev_ac_dec(ifp->idev, &addr);
1401 }
1402
1403 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1404 {
1405         if (dev->addr_len != ETH_ALEN)
1406                 return -1;
1407         memcpy(eui, dev->dev_addr, 3);
1408         memcpy(eui + 5, dev->dev_addr + 3, 3);
1409
1410         /*
1411          * The zSeries OSA network cards can be shared among various
1412          * OS instances, but the OSA cards have only one MAC address.
1413          * This leads to duplicate address conflicts in conjunction
1414          * with IPv6 if more than one instance uses the same card.
1415          *
1416          * The driver for these cards can deliver a unique 16-bit
1417          * identifier for each instance sharing the same card.  It is
1418          * placed instead of 0xFFFE in the interface identifier.  The
1419          * "u" bit of the interface identifier is not inverted in this
1420          * case.  Hence the resulting interface identifier has local
1421          * scope according to RFC2373.
1422          */
1423         if (dev->dev_id) {
1424                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1425                 eui[4] = dev->dev_id & 0xFF;
1426         } else {
1427                 eui[3] = 0xFF;
1428                 eui[4] = 0xFE;
1429                 eui[0] ^= 2;
1430         }
1431         return 0;
1432 }
1433
1434 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1435 {
1436         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1437         if (dev->addr_len != ARCNET_ALEN)
1438                 return -1;
1439         memset(eui, 0, 7);
1440         eui[7] = *(u8*)dev->dev_addr;
1441         return 0;
1442 }
1443
1444 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1445 {
1446         if (dev->addr_len != INFINIBAND_ALEN)
1447                 return -1;
1448         memcpy(eui, dev->dev_addr + 12, 8);
1449         eui[0] |= 2;
1450         return 0;
1451 }
1452
1453 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1454 {
1455         switch (dev->type) {
1456         case ARPHRD_ETHER:
1457         case ARPHRD_FDDI:
1458         case ARPHRD_IEEE802_TR:
1459                 return addrconf_ifid_eui48(eui, dev);
1460         case ARPHRD_ARCNET:
1461                 return addrconf_ifid_arcnet(eui, dev);
1462         case ARPHRD_INFINIBAND:
1463                 return addrconf_ifid_infiniband(eui, dev);
1464         case ARPHRD_SIT:
1465                 if (dev->priv_flags & IFF_ISATAP)
1466                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1467         }
1468         return -1;
1469 }
1470
1471 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1472 {
1473         int err = -1;
1474         struct inet6_ifaddr *ifp;
1475
1476         read_lock_bh(&idev->lock);
1477         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1478                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1479                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1480                         err = 0;
1481                         break;
1482                 }
1483         }
1484         read_unlock_bh(&idev->lock);
1485         return err;
1486 }
1487
1488 #ifdef CONFIG_IPV6_PRIVACY
1489 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1490 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1491 {
1492 regen:
1493         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1494         idev->rndid[0] &= ~0x02;
1495
1496         /*
1497          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1498          * check if generated address is not inappropriate
1499          *
1500          *  - Reserved subnet anycast (RFC 2526)
1501          *      11111101 11....11 1xxxxxxx
1502          *  - ISATAP (RFC4214) 6.1
1503          *      00-00-5E-FE-xx-xx-xx-xx
1504          *  - value 0
1505          *  - XXX: already assigned to an address on the device
1506          */
1507         if (idev->rndid[0] == 0xfd &&
1508             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1509             (idev->rndid[7]&0x80))
1510                 goto regen;
1511         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1512                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1513                         goto regen;
1514                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1515                         goto regen;
1516         }
1517
1518         return 0;
1519 }
1520
1521 static void ipv6_regen_rndid(unsigned long data)
1522 {
1523         struct inet6_dev *idev = (struct inet6_dev *) data;
1524         unsigned long expires;
1525
1526         rcu_read_lock_bh();
1527         write_lock_bh(&idev->lock);
1528
1529         if (idev->dead)
1530                 goto out;
1531
1532         if (__ipv6_regen_rndid(idev) < 0)
1533                 goto out;
1534
1535         expires = jiffies +
1536                 idev->cnf.temp_prefered_lft * HZ -
1537                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1538         if (time_before(expires, jiffies)) {
1539                 printk(KERN_WARNING
1540                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1541                         idev->dev->name);
1542                 goto out;
1543         }
1544
1545         if (!mod_timer(&idev->regen_timer, expires))
1546                 in6_dev_hold(idev);
1547
1548 out:
1549         write_unlock_bh(&idev->lock);
1550         rcu_read_unlock_bh();
1551         in6_dev_put(idev);
1552 }
1553
1554 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1555         int ret = 0;
1556
1557         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1558                 ret = __ipv6_regen_rndid(idev);
1559         return ret;
1560 }
1561 #endif
1562
1563 /*
1564  *      Add prefix route.
1565  */
1566
1567 static void
1568 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1569                       unsigned long expires, u32 flags)
1570 {
1571         struct fib6_config cfg = {
1572                 .fc_table = RT6_TABLE_PREFIX,
1573                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1574                 .fc_ifindex = dev->ifindex,
1575                 .fc_expires = expires,
1576                 .fc_dst_len = plen,
1577                 .fc_flags = RTF_UP | flags,
1578                 .fc_nlinfo.nl_net = &init_net,
1579         };
1580
1581         ipv6_addr_copy(&cfg.fc_dst, pfx);
1582
1583         /* Prevent useless cloning on PtP SIT.
1584            This thing is done here expecting that the whole
1585            class of non-broadcast devices need not cloning.
1586          */
1587 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1588         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1589                 cfg.fc_flags |= RTF_NONEXTHOP;
1590 #endif
1591
1592         ip6_route_add(&cfg);
1593 }
1594
1595 /* Create "default" multicast route to the interface */
1596
1597 static void addrconf_add_mroute(struct net_device *dev)
1598 {
1599         struct fib6_config cfg = {
1600                 .fc_table = RT6_TABLE_LOCAL,
1601                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1602                 .fc_ifindex = dev->ifindex,
1603                 .fc_dst_len = 8,
1604                 .fc_flags = RTF_UP,
1605                 .fc_nlinfo.nl_net = &init_net,
1606         };
1607
1608         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1609
1610         ip6_route_add(&cfg);
1611 }
1612
1613 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1614 static void sit_route_add(struct net_device *dev)
1615 {
1616         struct fib6_config cfg = {
1617                 .fc_table = RT6_TABLE_MAIN,
1618                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1619                 .fc_ifindex = dev->ifindex,
1620                 .fc_dst_len = 96,
1621                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1622                 .fc_nlinfo.nl_net = &init_net,
1623         };
1624
1625         /* prefix length - 96 bits "::d.d.d.d" */
1626         ip6_route_add(&cfg);
1627 }
1628 #endif
1629
1630 static void addrconf_add_lroute(struct net_device *dev)
1631 {
1632         struct in6_addr addr;
1633
1634         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1635         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1636 }
1637
1638 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1639 {
1640         struct inet6_dev *idev;
1641
1642         ASSERT_RTNL();
1643
1644         if ((idev = ipv6_find_idev(dev)) == NULL)
1645                 return NULL;
1646
1647         /* Add default multicast route */
1648         addrconf_add_mroute(dev);
1649
1650         /* Add link local route */
1651         addrconf_add_lroute(dev);
1652         return idev;
1653 }
1654
1655 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1656 {
1657         struct prefix_info *pinfo;
1658         __u32 valid_lft;
1659         __u32 prefered_lft;
1660         int addr_type;
1661         unsigned long rt_expires;
1662         struct inet6_dev *in6_dev;
1663
1664         pinfo = (struct prefix_info *) opt;
1665
1666         if (len < sizeof(struct prefix_info)) {
1667                 ADBG(("addrconf: prefix option too short\n"));
1668                 return;
1669         }
1670
1671         /*
1672          *      Validation checks ([ADDRCONF], page 19)
1673          */
1674
1675         addr_type = ipv6_addr_type(&pinfo->prefix);
1676
1677         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1678                 return;
1679
1680         valid_lft = ntohl(pinfo->valid);
1681         prefered_lft = ntohl(pinfo->prefered);
1682
1683         if (prefered_lft > valid_lft) {
1684                 if (net_ratelimit())
1685                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1686                 return;
1687         }
1688
1689         in6_dev = in6_dev_get(dev);
1690
1691         if (in6_dev == NULL) {
1692                 if (net_ratelimit())
1693                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1694                 return;
1695         }
1696
1697         /*
1698          *      Two things going on here:
1699          *      1) Add routes for on-link prefixes
1700          *      2) Configure prefixes with the auto flag set
1701          */
1702
1703         /* Avoid arithmetic overflow. Really, we could
1704            save rt_expires in seconds, likely valid_lft,
1705            but it would require division in fib gc, that it
1706            not good.
1707          */
1708         if (valid_lft >= 0x7FFFFFFF/HZ)
1709                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1710         else
1711                 rt_expires = valid_lft * HZ;
1712
1713         /*
1714          * We convert this (in jiffies) to clock_t later.
1715          * Avoid arithmetic overflow there as well.
1716          * Overflow can happen only if HZ < USER_HZ.
1717          */
1718         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1719                 rt_expires = 0x7FFFFFFF / USER_HZ;
1720
1721         if (pinfo->onlink) {
1722                 struct rt6_info *rt;
1723                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1724
1725                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1726                         if (rt->rt6i_flags&RTF_EXPIRES) {
1727                                 if (valid_lft == 0) {
1728                                         ip6_del_rt(rt);
1729                                         rt = NULL;
1730                                 } else {
1731                                         rt->rt6i_expires = jiffies + rt_expires;
1732                                 }
1733                         }
1734                 } else if (valid_lft) {
1735                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1736                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1737                 }
1738                 if (rt)
1739                         dst_release(&rt->u.dst);
1740         }
1741
1742         /* Try to figure out our local address for this prefix */
1743
1744         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1745                 struct inet6_ifaddr * ifp;
1746                 struct in6_addr addr;
1747                 int create = 0, update_lft = 0;
1748
1749                 if (pinfo->prefix_len == 64) {
1750                         memcpy(&addr, &pinfo->prefix, 8);
1751                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1752                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1753                                 in6_dev_put(in6_dev);
1754                                 return;
1755                         }
1756                         goto ok;
1757                 }
1758                 if (net_ratelimit())
1759                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1760                                pinfo->prefix_len);
1761                 in6_dev_put(in6_dev);
1762                 return;
1763
1764 ok:
1765
1766                 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1767
1768                 if (ifp == NULL && valid_lft) {
1769                         int max_addresses = in6_dev->cnf.max_addresses;
1770                         u32 addr_flags = 0;
1771
1772 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1773                         if (in6_dev->cnf.optimistic_dad &&
1774                             !ipv6_devconf.forwarding)
1775                                 addr_flags = IFA_F_OPTIMISTIC;
1776 #endif
1777
1778                         /* Do not allow to create too much of autoconfigured
1779                          * addresses; this would be too easy way to crash kernel.
1780                          */
1781                         if (!max_addresses ||
1782                             ipv6_count_addresses(in6_dev) < max_addresses)
1783                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1784                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1785                                                     addr_flags);
1786
1787                         if (!ifp || IS_ERR(ifp)) {
1788                                 in6_dev_put(in6_dev);
1789                                 return;
1790                         }
1791
1792                         update_lft = create = 1;
1793                         ifp->cstamp = jiffies;
1794                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1795                 }
1796
1797                 if (ifp) {
1798                         int flags;
1799                         unsigned long now;
1800 #ifdef CONFIG_IPV6_PRIVACY
1801                         struct inet6_ifaddr *ift;
1802 #endif
1803                         u32 stored_lft;
1804
1805                         /* update lifetime (RFC2462 5.5.3 e) */
1806                         spin_lock(&ifp->lock);
1807                         now = jiffies;
1808                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1809                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1810                         else
1811                                 stored_lft = 0;
1812                         if (!update_lft && stored_lft) {
1813                                 if (valid_lft > MIN_VALID_LIFETIME ||
1814                                     valid_lft > stored_lft)
1815                                         update_lft = 1;
1816                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1817                                         /* valid_lft <= stored_lft is always true */
1818                                         /* XXX: IPsec */
1819                                         update_lft = 0;
1820                                 } else {
1821                                         valid_lft = MIN_VALID_LIFETIME;
1822                                         if (valid_lft < prefered_lft)
1823                                                 prefered_lft = valid_lft;
1824                                         update_lft = 1;
1825                                 }
1826                         }
1827
1828                         if (update_lft) {
1829                                 ifp->valid_lft = valid_lft;
1830                                 ifp->prefered_lft = prefered_lft;
1831                                 ifp->tstamp = now;
1832                                 flags = ifp->flags;
1833                                 ifp->flags &= ~IFA_F_DEPRECATED;
1834                                 spin_unlock(&ifp->lock);
1835
1836                                 if (!(flags&IFA_F_TENTATIVE))
1837                                         ipv6_ifa_notify(0, ifp);
1838                         } else
1839                                 spin_unlock(&ifp->lock);
1840
1841 #ifdef CONFIG_IPV6_PRIVACY
1842                         read_lock_bh(&in6_dev->lock);
1843                         /* update all temporary addresses in the list */
1844                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1845                                 /*
1846                                  * When adjusting the lifetimes of an existing
1847                                  * temporary address, only lower the lifetimes.
1848                                  * Implementations must not increase the
1849                                  * lifetimes of an existing temporary address
1850                                  * when processing a Prefix Information Option.
1851                                  */
1852                                 if (ifp != ift->ifpub)
1853                                         continue;
1854
1855                                 spin_lock(&ift->lock);
1856                                 flags = ift->flags;
1857                                 if (ift->valid_lft > valid_lft &&
1858                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1859                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1860                                 if (ift->prefered_lft > prefered_lft &&
1861                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1862                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1863                                 spin_unlock(&ift->lock);
1864                                 if (!(flags&IFA_F_TENTATIVE))
1865                                         ipv6_ifa_notify(0, ift);
1866                         }
1867
1868                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1869                                 /*
1870                                  * When a new public address is created as described in [ADDRCONF],
1871                                  * also create a new temporary address.
1872                                  */
1873                                 read_unlock_bh(&in6_dev->lock);
1874                                 ipv6_create_tempaddr(ifp, NULL);
1875                         } else {
1876                                 read_unlock_bh(&in6_dev->lock);
1877                         }
1878 #endif
1879                         in6_ifa_put(ifp);
1880                         addrconf_verify(0);
1881                 }
1882         }
1883         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1884         in6_dev_put(in6_dev);
1885 }
1886
1887 /*
1888  *      Set destination address.
1889  *      Special case for SIT interfaces where we create a new "virtual"
1890  *      device.
1891  */
1892 int addrconf_set_dstaddr(void __user *arg)
1893 {
1894         struct in6_ifreq ireq;
1895         struct net_device *dev;
1896         int err = -EINVAL;
1897
1898         rtnl_lock();
1899
1900         err = -EFAULT;
1901         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1902                 goto err_exit;
1903
1904         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1905
1906         err = -ENODEV;
1907         if (dev == NULL)
1908                 goto err_exit;
1909
1910 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1911         if (dev->type == ARPHRD_SIT) {
1912                 struct ifreq ifr;
1913                 mm_segment_t    oldfs;
1914                 struct ip_tunnel_parm p;
1915
1916                 err = -EADDRNOTAVAIL;
1917                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1918                         goto err_exit;
1919
1920                 memset(&p, 0, sizeof(p));
1921                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1922                 p.iph.saddr = 0;
1923                 p.iph.version = 4;
1924                 p.iph.ihl = 5;
1925                 p.iph.protocol = IPPROTO_IPV6;
1926                 p.iph.ttl = 64;
1927                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1928
1929                 oldfs = get_fs(); set_fs(KERNEL_DS);
1930                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1931                 set_fs(oldfs);
1932
1933                 if (err == 0) {
1934                         err = -ENOBUFS;
1935                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1936                                 goto err_exit;
1937                         err = dev_open(dev);
1938                 }
1939         }
1940 #endif
1941
1942 err_exit:
1943         rtnl_unlock();
1944         return err;
1945 }
1946
1947 /*
1948  *      Manual configuration of address on an interface
1949  */
1950 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1951                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1952 {
1953         struct inet6_ifaddr *ifp;
1954         struct inet6_dev *idev;
1955         struct net_device *dev;
1956         int scope;
1957         u32 flags = RTF_EXPIRES;
1958
1959         ASSERT_RTNL();
1960
1961         /* check the lifetime */
1962         if (!valid_lft || prefered_lft > valid_lft)
1963                 return -EINVAL;
1964
1965         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1966                 return -ENODEV;
1967
1968         if ((idev = addrconf_add_dev(dev)) == NULL)
1969                 return -ENOBUFS;
1970
1971         scope = ipv6_addr_scope(pfx);
1972
1973         if (valid_lft == INFINITY_LIFE_TIME) {
1974                 ifa_flags |= IFA_F_PERMANENT;
1975                 flags = 0;
1976         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1977                 valid_lft = 0x7FFFFFFF/HZ;
1978
1979         if (prefered_lft == 0)
1980                 ifa_flags |= IFA_F_DEPRECATED;
1981         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1982                  (prefered_lft != INFINITY_LIFE_TIME))
1983                 prefered_lft = 0x7FFFFFFF/HZ;
1984
1985         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1986
1987         if (!IS_ERR(ifp)) {
1988                 spin_lock_bh(&ifp->lock);
1989                 ifp->valid_lft = valid_lft;
1990                 ifp->prefered_lft = prefered_lft;
1991                 ifp->tstamp = jiffies;
1992                 spin_unlock_bh(&ifp->lock);
1993
1994                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1995                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1996                 /*
1997                  * Note that section 3.1 of RFC 4429 indicates
1998                  * that the Optimistic flag should not be set for
1999                  * manually configured addresses
2000                  */
2001                 addrconf_dad_start(ifp, 0);
2002                 in6_ifa_put(ifp);
2003                 addrconf_verify(0);
2004                 return 0;
2005         }
2006
2007         return PTR_ERR(ifp);
2008 }
2009
2010 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
2011 {
2012         struct inet6_ifaddr *ifp;
2013         struct inet6_dev *idev;
2014         struct net_device *dev;
2015
2016         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
2017                 return -ENODEV;
2018
2019         if ((idev = __in6_dev_get(dev)) == NULL)
2020                 return -ENXIO;
2021
2022         read_lock_bh(&idev->lock);
2023         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2024                 if (ifp->prefix_len == plen &&
2025                     ipv6_addr_equal(pfx, &ifp->addr)) {
2026                         in6_ifa_hold(ifp);
2027                         read_unlock_bh(&idev->lock);
2028
2029                         ipv6_del_addr(ifp);
2030
2031                         /* If the last address is deleted administratively,
2032                            disable IPv6 on this interface.
2033                          */
2034                         if (idev->addr_list == NULL)
2035                                 addrconf_ifdown(idev->dev, 1);
2036                         return 0;
2037                 }
2038         }
2039         read_unlock_bh(&idev->lock);
2040         return -EADDRNOTAVAIL;
2041 }
2042
2043
2044 int addrconf_add_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_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2057                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2058         rtnl_unlock();
2059         return err;
2060 }
2061
2062 int addrconf_del_ifaddr(void __user *arg)
2063 {
2064         struct in6_ifreq ireq;
2065         int err;
2066
2067         if (!capable(CAP_NET_ADMIN))
2068                 return -EPERM;
2069
2070         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2071                 return -EFAULT;
2072
2073         rtnl_lock();
2074         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2075         rtnl_unlock();
2076         return err;
2077 }
2078
2079 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2080 static void sit_add_v4_addrs(struct inet6_dev *idev)
2081 {
2082         struct inet6_ifaddr * ifp;
2083         struct in6_addr addr;
2084         struct net_device *dev;
2085         int scope;
2086
2087         ASSERT_RTNL();
2088
2089         memset(&addr, 0, sizeof(struct in6_addr));
2090         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2091
2092         if (idev->dev->flags&IFF_POINTOPOINT) {
2093                 addr.s6_addr32[0] = htonl(0xfe800000);
2094                 scope = IFA_LINK;
2095         } else {
2096                 scope = IPV6_ADDR_COMPATv4;
2097         }
2098
2099         if (addr.s6_addr32[3]) {
2100                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2101                 if (!IS_ERR(ifp)) {
2102                         spin_lock_bh(&ifp->lock);
2103                         ifp->flags &= ~IFA_F_TENTATIVE;
2104                         spin_unlock_bh(&ifp->lock);
2105                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2106                         in6_ifa_put(ifp);
2107                 }
2108                 return;
2109         }
2110
2111         for_each_netdev(&init_net, dev) {
2112                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2113                 if (in_dev && (dev->flags & IFF_UP)) {
2114                         struct in_ifaddr * ifa;
2115
2116                         int flag = scope;
2117
2118                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2119                                 int plen;
2120
2121                                 addr.s6_addr32[3] = ifa->ifa_local;
2122
2123                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2124                                         continue;
2125                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2126                                         if (idev->dev->flags&IFF_POINTOPOINT)
2127                                                 continue;
2128                                         flag |= IFA_HOST;
2129                                 }
2130                                 if (idev->dev->flags&IFF_POINTOPOINT)
2131                                         plen = 64;
2132                                 else
2133                                         plen = 96;
2134
2135                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2136                                                     IFA_F_PERMANENT);
2137                                 if (!IS_ERR(ifp)) {
2138                                         spin_lock_bh(&ifp->lock);
2139                                         ifp->flags &= ~IFA_F_TENTATIVE;
2140                                         spin_unlock_bh(&ifp->lock);
2141                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2142                                         in6_ifa_put(ifp);
2143                                 }
2144                         }
2145                 }
2146         }
2147 }
2148 #endif
2149
2150 static void init_loopback(struct net_device *dev)
2151 {
2152         struct inet6_dev  *idev;
2153         struct inet6_ifaddr * ifp;
2154
2155         /* ::1 */
2156
2157         ASSERT_RTNL();
2158
2159         if ((idev = ipv6_find_idev(dev)) == NULL) {
2160                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2161                 return;
2162         }
2163
2164         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2165         if (!IS_ERR(ifp)) {
2166                 spin_lock_bh(&ifp->lock);
2167                 ifp->flags &= ~IFA_F_TENTATIVE;
2168                 spin_unlock_bh(&ifp->lock);
2169                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2170                 in6_ifa_put(ifp);
2171         }
2172 }
2173
2174 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2175 {
2176         struct inet6_ifaddr * ifp;
2177         u32 addr_flags = IFA_F_PERMANENT;
2178
2179 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2180         if (idev->cnf.optimistic_dad &&
2181             !ipv6_devconf.forwarding)
2182                 addr_flags |= IFA_F_OPTIMISTIC;
2183 #endif
2184
2185
2186         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2187         if (!IS_ERR(ifp)) {
2188                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2189                 addrconf_dad_start(ifp, 0);
2190                 in6_ifa_put(ifp);
2191         }
2192 }
2193
2194 static void addrconf_dev_config(struct net_device *dev)
2195 {
2196         struct in6_addr addr;
2197         struct inet6_dev    * idev;
2198
2199         ASSERT_RTNL();
2200
2201         if ((dev->type != ARPHRD_ETHER) &&
2202             (dev->type != ARPHRD_FDDI) &&
2203             (dev->type != ARPHRD_IEEE802_TR) &&
2204             (dev->type != ARPHRD_ARCNET) &&
2205             (dev->type != ARPHRD_INFINIBAND)) {
2206                 /* Alas, we support only Ethernet autoconfiguration. */
2207                 return;
2208         }
2209
2210         idev = addrconf_add_dev(dev);
2211         if (idev == NULL)
2212                 return;
2213
2214         memset(&addr, 0, sizeof(struct in6_addr));
2215         addr.s6_addr32[0] = htonl(0xFE800000);
2216
2217         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2218                 addrconf_add_linklocal(idev, &addr);
2219 }
2220
2221 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2222 static void addrconf_sit_config(struct net_device *dev)
2223 {
2224         struct inet6_dev *idev;
2225
2226         ASSERT_RTNL();
2227
2228         /*
2229          * Configure the tunnel with one of our IPv4
2230          * addresses... we should configure all of
2231          * our v4 addrs in the tunnel
2232          */
2233
2234         if ((idev = ipv6_find_idev(dev)) == NULL) {
2235                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2236                 return;
2237         }
2238
2239         if (dev->priv_flags & IFF_ISATAP) {
2240                 struct in6_addr addr;
2241
2242                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2243                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2244                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2245                         addrconf_add_linklocal(idev, &addr);
2246                 return;
2247         }
2248
2249         sit_add_v4_addrs(idev);
2250
2251         if (dev->flags&IFF_POINTOPOINT) {
2252                 addrconf_add_mroute(dev);
2253                 addrconf_add_lroute(dev);
2254         } else
2255                 sit_route_add(dev);
2256 }
2257 #endif
2258
2259 static inline int
2260 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2261 {
2262         struct in6_addr lladdr;
2263
2264         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2265                 addrconf_add_linklocal(idev, &lladdr);
2266                 return 0;
2267         }
2268         return -1;
2269 }
2270
2271 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2272 {
2273         struct net_device *link_dev;
2274
2275         /* first try to inherit the link-local address from the link device */
2276         if (idev->dev->iflink &&
2277             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2278                 if (!ipv6_inherit_linklocal(idev, link_dev))
2279                         return;
2280         }
2281         /* then try to inherit it from any device */
2282         for_each_netdev(&init_net, link_dev) {
2283                 if (!ipv6_inherit_linklocal(idev, link_dev))
2284                         return;
2285         }
2286         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2287 }
2288
2289 /*
2290  * Autoconfigure tunnel with a link-local address so routing protocols,
2291  * DHCPv6, MLD etc. can be run over the virtual link
2292  */
2293
2294 static void addrconf_ip6_tnl_config(struct net_device *dev)
2295 {
2296         struct inet6_dev *idev;
2297
2298         ASSERT_RTNL();
2299
2300         if ((idev = addrconf_add_dev(dev)) == NULL) {
2301                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2302                 return;
2303         }
2304         ip6_tnl_add_linklocal(idev);
2305 }
2306
2307 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2308                            void * data)
2309 {
2310         struct net_device *dev = (struct net_device *) data;
2311         struct inet6_dev *idev = __in6_dev_get(dev);
2312         int run_pending = 0;
2313         int err;
2314
2315         if (dev->nd_net != &init_net)
2316                 return NOTIFY_DONE;
2317
2318         switch(event) {
2319         case NETDEV_REGISTER:
2320                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2321                         idev = ipv6_add_dev(dev);
2322                         if (!idev)
2323                                 return notifier_from_errno(-ENOMEM);
2324                 }
2325                 break;
2326         case NETDEV_UP:
2327         case NETDEV_CHANGE:
2328                 if (dev->flags & IFF_SLAVE)
2329                         break;
2330
2331                 if (event == NETDEV_UP) {
2332                         if (!addrconf_qdisc_ok(dev)) {
2333                                 /* device is not ready yet. */
2334                                 printk(KERN_INFO
2335                                         "ADDRCONF(NETDEV_UP): %s: "
2336                                         "link is not ready\n",
2337                                         dev->name);
2338                                 break;
2339                         }
2340
2341                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2342                                 idev = ipv6_add_dev(dev);
2343
2344                         if (idev)
2345                                 idev->if_flags |= IF_READY;
2346                 } else {
2347                         if (!addrconf_qdisc_ok(dev)) {
2348                                 /* device is still not ready. */
2349                                 break;
2350                         }
2351
2352                         if (idev) {
2353                                 if (idev->if_flags & IF_READY) {
2354                                         /* device is already configured. */
2355                                         break;
2356                                 }
2357                                 idev->if_flags |= IF_READY;
2358                         }
2359
2360                         printk(KERN_INFO
2361                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2362                                         "link becomes ready\n",
2363                                         dev->name);
2364
2365                         run_pending = 1;
2366                 }
2367
2368                 switch(dev->type) {
2369 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2370                 case ARPHRD_SIT:
2371                         addrconf_sit_config(dev);
2372                         break;
2373 #endif
2374                 case ARPHRD_TUNNEL6:
2375                         addrconf_ip6_tnl_config(dev);
2376                         break;
2377                 case ARPHRD_LOOPBACK:
2378                         init_loopback(dev);
2379                         break;
2380
2381                 default:
2382                         addrconf_dev_config(dev);
2383                         break;
2384                 }
2385                 if (idev) {
2386                         if (run_pending)
2387                                 addrconf_dad_run(idev);
2388
2389                         /* If the MTU changed during the interface down, when the
2390                            interface up, the changed MTU must be reflected in the
2391                            idev as well as routers.
2392                          */
2393                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2394                                 rt6_mtu_change(dev, dev->mtu);
2395                                 idev->cnf.mtu6 = dev->mtu;
2396                         }
2397                         idev->tstamp = jiffies;
2398                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2399                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2400                            stop IPv6 on this interface.
2401                          */
2402                         if (dev->mtu < IPV6_MIN_MTU)
2403                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2404                 }
2405                 break;
2406
2407         case NETDEV_CHANGEMTU:
2408                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2409                         rt6_mtu_change(dev, dev->mtu);
2410                         idev->cnf.mtu6 = dev->mtu;
2411                         break;
2412                 }
2413
2414                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2415                         idev = ipv6_add_dev(dev);
2416                         if (idev)
2417                                 break;
2418                 }
2419
2420                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2421
2422         case NETDEV_DOWN:
2423         case NETDEV_UNREGISTER:
2424                 /*
2425                  *      Remove all addresses from this interface.
2426                  */
2427                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2428                 break;
2429
2430         case NETDEV_CHANGENAME:
2431                 if (idev) {
2432                         snmp6_unregister_dev(idev);
2433                         addrconf_sysctl_unregister(idev);
2434                         addrconf_sysctl_register(idev);
2435                         err = snmp6_register_dev(idev);
2436                         if (err)
2437                                 return notifier_from_errno(err);
2438                 }
2439                 break;
2440         }
2441
2442         return NOTIFY_OK;
2443 }
2444
2445 /*
2446  *      addrconf module should be notified of a device going up
2447  */
2448 static struct notifier_block ipv6_dev_notf = {
2449         .notifier_call = addrconf_notify,
2450         .priority = 0
2451 };
2452
2453 static int addrconf_ifdown(struct net_device *dev, int how)
2454 {
2455         struct inet6_dev *idev;
2456         struct inet6_ifaddr *ifa, **bifa;
2457         int i;
2458
2459         ASSERT_RTNL();
2460
2461         if ((dev->flags & IFF_LOOPBACK) && how == 1)
2462                 how = 0;
2463
2464         rt6_ifdown(dev);
2465         neigh_ifdown(&nd_tbl, dev);
2466
2467         idev = __in6_dev_get(dev);
2468         if (idev == NULL)
2469                 return -ENODEV;
2470
2471         /* Step 1: remove reference to ipv6 device from parent device.
2472                    Do not dev_put!
2473          */
2474         if (how) {
2475                 idev->dead = 1;
2476
2477                 /* protected by rtnl_lock */
2478                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2479
2480                 /* Step 1.5: remove snmp6 entry */
2481                 snmp6_unregister_dev(idev);
2482
2483         }
2484
2485         /* Step 2: clear hash table */
2486         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2487                 bifa = &inet6_addr_lst[i];
2488
2489                 write_lock_bh(&addrconf_hash_lock);
2490                 while ((ifa = *bifa) != NULL) {
2491                         if (ifa->idev == idev) {
2492                                 *bifa = ifa->lst_next;
2493                                 ifa->lst_next = NULL;
2494                                 addrconf_del_timer(ifa);
2495                                 in6_ifa_put(ifa);
2496                                 continue;
2497                         }
2498                         bifa = &ifa->lst_next;
2499                 }
2500                 write_unlock_bh(&addrconf_hash_lock);
2501         }
2502
2503         write_lock_bh(&idev->lock);
2504
2505         /* Step 3: clear flags for stateless addrconf */
2506         if (!how)
2507                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2508
2509         /* Step 4: clear address list */
2510 #ifdef CONFIG_IPV6_PRIVACY
2511         if (how && del_timer(&idev->regen_timer))
2512                 in6_dev_put(idev);
2513
2514         /* clear tempaddr list */
2515         while ((ifa = idev->tempaddr_list) != NULL) {
2516                 idev->tempaddr_list = ifa->tmp_next;
2517                 ifa->tmp_next = NULL;
2518                 ifa->dead = 1;
2519                 write_unlock_bh(&idev->lock);
2520                 spin_lock_bh(&ifa->lock);
2521
2522                 if (ifa->ifpub) {
2523                         in6_ifa_put(ifa->ifpub);
2524                         ifa->ifpub = NULL;
2525                 }
2526                 spin_unlock_bh(&ifa->lock);
2527                 in6_ifa_put(ifa);
2528                 write_lock_bh(&idev->lock);
2529         }
2530 #endif
2531         while ((ifa = idev->addr_list) != NULL) {
2532                 idev->addr_list = ifa->if_next;
2533                 ifa->if_next = NULL;
2534                 ifa->dead = 1;
2535                 addrconf_del_timer(ifa);
2536                 write_unlock_bh(&idev->lock);
2537
2538                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2539                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2540                 in6_ifa_put(ifa);
2541
2542                 write_lock_bh(&idev->lock);
2543         }
2544         write_unlock_bh(&idev->lock);
2545
2546         /* Step 5: Discard multicast list */
2547
2548         if (how)
2549                 ipv6_mc_destroy_dev(idev);
2550         else
2551                 ipv6_mc_down(idev);
2552
2553         idev->tstamp = jiffies;
2554
2555         /* Shot the device (if unregistered) */
2556
2557         if (how) {
2558                 addrconf_sysctl_unregister(idev);
2559                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2560                 neigh_ifdown(&nd_tbl, dev);
2561                 in6_dev_put(idev);
2562         }
2563         return 0;
2564 }
2565
2566 static void addrconf_rs_timer(unsigned long data)
2567 {
2568         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2569
2570         if (ifp->idev->cnf.forwarding)
2571                 goto out;
2572
2573         if (ifp->idev->if_flags & IF_RA_RCVD) {
2574                 /*
2575                  *      Announcement received after solicitation
2576                  *      was sent
2577                  */
2578                 goto out;
2579         }
2580
2581         spin_lock(&ifp->lock);
2582         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2583                 struct in6_addr all_routers;
2584
2585                 /* The wait after the last probe can be shorter */
2586                 addrconf_mod_timer(ifp, AC_RS,
2587                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2588                                    ifp->idev->cnf.rtr_solicit_delay :
2589                                    ifp->idev->cnf.rtr_solicit_interval);
2590                 spin_unlock(&ifp->lock);
2591
2592                 ipv6_addr_all_routers(&all_routers);
2593
2594                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2595         } else {
2596                 spin_unlock(&ifp->lock);
2597                 /*
2598                  * Note: we do not support deprecated "all on-link"
2599                  * assumption any longer.
2600                  */
2601                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2602                        ifp->idev->dev->name);
2603         }
2604
2605 out:
2606         in6_ifa_put(ifp);
2607 }
2608
2609 /*
2610  *      Duplicate Address Detection
2611  */
2612 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2613 {
2614         unsigned long rand_num;
2615         struct inet6_dev *idev = ifp->idev;
2616
2617         if (ifp->flags & IFA_F_OPTIMISTIC)
2618                 rand_num = 0;
2619         else
2620                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2621
2622         ifp->probes = idev->cnf.dad_transmits;
2623         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2624 }
2625
2626 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2627 {
2628         struct inet6_dev *idev = ifp->idev;
2629         struct net_device *dev = idev->dev;
2630
2631         addrconf_join_solict(dev, &ifp->addr);
2632
2633         net_srandom(ifp->addr.s6_addr32[3]);
2634
2635         read_lock_bh(&idev->lock);
2636         if (ifp->dead)
2637                 goto out;
2638         spin_lock_bh(&ifp->lock);
2639
2640         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2641             !(ifp->flags&IFA_F_TENTATIVE) ||
2642             ifp->flags & IFA_F_NODAD) {
2643                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2644                 spin_unlock_bh(&ifp->lock);
2645                 read_unlock_bh(&idev->lock);
2646
2647                 addrconf_dad_completed(ifp);
2648                 return;
2649         }
2650
2651         if (!(idev->if_flags & IF_READY)) {
2652                 spin_unlock_bh(&ifp->lock);
2653                 read_unlock_bh(&idev->lock);
2654                 /*
2655                  * If the defice is not ready:
2656                  * - keep it tentative if it is a permanent address.
2657                  * - otherwise, kill it.
2658                  */
2659                 in6_ifa_hold(ifp);
2660                 addrconf_dad_stop(ifp);
2661                 return;
2662         }
2663
2664         /*
2665          * Optimistic nodes can start receiving
2666          * Frames right away
2667          */
2668         if(ifp->flags & IFA_F_OPTIMISTIC)
2669                 ip6_ins_rt(ifp->rt);
2670
2671         addrconf_dad_kick(ifp);
2672         spin_unlock_bh(&ifp->lock);
2673 out:
2674         read_unlock_bh(&idev->lock);
2675 }
2676
2677 static void addrconf_dad_timer(unsigned long data)
2678 {
2679         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2680         struct inet6_dev *idev = ifp->idev;
2681         struct in6_addr unspec;
2682         struct in6_addr mcaddr;
2683
2684         read_lock_bh(&idev->lock);
2685         if (idev->dead) {
2686                 read_unlock_bh(&idev->lock);
2687                 goto out;
2688         }
2689         spin_lock_bh(&ifp->lock);
2690         if (ifp->probes == 0) {
2691                 /*
2692                  * DAD was successful
2693                  */
2694
2695                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2696                 spin_unlock_bh(&ifp->lock);
2697                 read_unlock_bh(&idev->lock);
2698
2699                 addrconf_dad_completed(ifp);
2700
2701                 goto out;
2702         }
2703
2704         ifp->probes--;
2705         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2706         spin_unlock_bh(&ifp->lock);
2707         read_unlock_bh(&idev->lock);
2708
2709         /* send a neighbour solicitation for our addr */
2710         memset(&unspec, 0, sizeof(unspec));
2711         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2712         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2713 out:
2714         in6_ifa_put(ifp);
2715 }
2716
2717 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2718 {
2719         struct net_device *     dev = ifp->idev->dev;
2720
2721         /*
2722          *      Configure the address for reception. Now it is valid.
2723          */
2724
2725         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2726
2727         /* If added prefix is link local and forwarding is off,
2728            start sending router solicitations.
2729          */
2730
2731         if (ifp->idev->cnf.forwarding == 0 &&
2732             ifp->idev->cnf.rtr_solicits > 0 &&
2733             (dev->flags&IFF_LOOPBACK) == 0 &&
2734             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2735                 struct in6_addr all_routers;
2736
2737                 ipv6_addr_all_routers(&all_routers);
2738
2739                 /*
2740                  *      If a host as already performed a random delay
2741                  *      [...] as part of DAD [...] there is no need
2742                  *      to delay again before sending the first RS
2743                  */
2744                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2745
2746                 spin_lock_bh(&ifp->lock);
2747                 ifp->probes = 1;
2748                 ifp->idev->if_flags |= IF_RS_SENT;
2749                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2750                 spin_unlock_bh(&ifp->lock);
2751         }
2752 }
2753
2754 static void addrconf_dad_run(struct inet6_dev *idev) {
2755         struct inet6_ifaddr *ifp;
2756
2757         read_lock_bh(&idev->lock);
2758         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2759                 spin_lock_bh(&ifp->lock);
2760                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2761                         spin_unlock_bh(&ifp->lock);
2762                         continue;
2763                 }
2764                 spin_unlock_bh(&ifp->lock);
2765                 addrconf_dad_kick(ifp);
2766         }
2767         read_unlock_bh(&idev->lock);
2768 }
2769
2770 #ifdef CONFIG_PROC_FS
2771 struct if6_iter_state {
2772         struct seq_net_private p;
2773         int bucket;
2774 };
2775
2776 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2777 {
2778         struct inet6_ifaddr *ifa = NULL;
2779         struct if6_iter_state *state = seq->private;
2780         struct net *net = state->p.net;
2781
2782         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2783                 ifa = inet6_addr_lst[state->bucket];
2784
2785                 while (ifa && ifa->idev->dev->nd_net != net)
2786                         ifa = ifa->lst_next;
2787                 if (ifa)
2788                         break;
2789         }
2790         return ifa;
2791 }
2792
2793 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2794 {
2795         struct if6_iter_state *state = seq->private;
2796         struct net *net = state->p.net;
2797
2798         ifa = ifa->lst_next;
2799 try_again:
2800         if (ifa) {
2801                 if (ifa->idev->dev->nd_net != net) {
2802                         ifa = ifa->lst_next;
2803                         goto try_again;
2804                 }
2805         }
2806
2807         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2808                 ifa = inet6_addr_lst[state->bucket];
2809                 goto try_again;
2810         }
2811
2812         return ifa;
2813 }
2814
2815 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2816 {
2817         struct inet6_ifaddr *ifa = if6_get_first(seq);
2818
2819         if (ifa)
2820                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2821                         --pos;
2822         return pos ? NULL : ifa;
2823 }
2824
2825 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2826         __acquires(addrconf_hash_lock)
2827 {
2828         read_lock_bh(&addrconf_hash_lock);
2829         return if6_get_idx(seq, *pos);
2830 }
2831
2832 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2833 {
2834         struct inet6_ifaddr *ifa;
2835
2836         ifa = if6_get_next(seq, v);
2837         ++*pos;
2838         return ifa;
2839 }
2840
2841 static void if6_seq_stop(struct seq_file *seq, void *v)
2842         __releases(addrconf_hash_lock)
2843 {
2844         read_unlock_bh(&addrconf_hash_lock);
2845 }
2846
2847 static int if6_seq_show(struct seq_file *seq, void *v)
2848 {
2849         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2850         seq_printf(seq,
2851                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2852                    NIP6(ifp->addr),
2853                    ifp->idev->dev->ifindex,
2854                    ifp->prefix_len,
2855                    ifp->scope,
2856                    ifp->flags,
2857                    ifp->idev->dev->name);
2858         return 0;
2859 }
2860
2861 static const struct seq_operations if6_seq_ops = {
2862         .start  = if6_seq_start,
2863         .next   = if6_seq_next,
2864         .show   = if6_seq_show,
2865         .stop   = if6_seq_stop,
2866 };
2867
2868 static int if6_seq_open(struct inode *inode, struct file *file)
2869 {
2870         return seq_open_net(inode, file, &if6_seq_ops,
2871                             sizeof(struct if6_iter_state));
2872 }
2873
2874 static const struct file_operations if6_fops = {
2875         .owner          = THIS_MODULE,
2876         .open           = if6_seq_open,
2877         .read           = seq_read,
2878         .llseek         = seq_lseek,
2879         .release        = seq_release_net,
2880 };
2881
2882 static int if6_proc_net_init(struct net *net)
2883 {
2884         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2885                 return -ENOMEM;
2886         return 0;
2887 }
2888
2889 static void if6_proc_net_exit(struct net *net)
2890 {
2891        proc_net_remove(net, "if_inet6");
2892 }
2893
2894 static struct pernet_operations if6_proc_net_ops = {
2895        .init = if6_proc_net_init,
2896        .exit = if6_proc_net_exit,
2897 };
2898
2899 int __init if6_proc_init(void)
2900 {
2901         return register_pernet_subsys(&if6_proc_net_ops);
2902 }
2903
2904 void if6_proc_exit(void)
2905 {
2906         unregister_pernet_subsys(&if6_proc_net_ops);
2907 }
2908 #endif  /* CONFIG_PROC_FS */
2909
2910 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2911 /* Check if address is a home address configured on any interface. */
2912 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2913 {
2914         int ret = 0;
2915         struct inet6_ifaddr * ifp;
2916         u8 hash = ipv6_addr_hash(addr);
2917         read_lock_bh(&addrconf_hash_lock);
2918         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2919                 if (ifp->idev->dev->nd_net != net)
2920                         continue;
2921                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2922                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2923                         ret = 1;
2924                         break;
2925                 }
2926         }
2927         read_unlock_bh(&addrconf_hash_lock);
2928         return ret;
2929 }
2930 #endif
2931
2932 /*
2933  *      Periodic address status verification
2934  */
2935
2936 static void addrconf_verify(unsigned long foo)
2937 {
2938         struct inet6_ifaddr *ifp;
2939         unsigned long now, next;
2940         int i;
2941
2942         spin_lock_bh(&addrconf_verify_lock);
2943         now = jiffies;
2944         next = now + ADDR_CHECK_FREQUENCY;
2945
2946         del_timer(&addr_chk_timer);
2947
2948         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2949
2950 restart:
2951                 read_lock(&addrconf_hash_lock);
2952                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2953                         unsigned long age;
2954 #ifdef CONFIG_IPV6_PRIVACY
2955                         unsigned long regen_advance;
2956 #endif
2957
2958                         if (ifp->flags & IFA_F_PERMANENT)
2959                                 continue;
2960
2961                         spin_lock(&ifp->lock);
2962                         age = (now - ifp->tstamp) / HZ;
2963
2964 #ifdef CONFIG_IPV6_PRIVACY
2965                         regen_advance = ifp->idev->cnf.regen_max_retry *
2966                                         ifp->idev->cnf.dad_transmits *
2967                                         ifp->idev->nd_parms->retrans_time / HZ;
2968 #endif
2969
2970                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2971                             age >= ifp->valid_lft) {
2972                                 spin_unlock(&ifp->lock);
2973                                 in6_ifa_hold(ifp);
2974                                 read_unlock(&addrconf_hash_lock);
2975                                 ipv6_del_addr(ifp);
2976                                 goto restart;
2977                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2978                                 spin_unlock(&ifp->lock);
2979                                 continue;
2980                         } else if (age >= ifp->prefered_lft) {
2981                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2982                                 int deprecate = 0;
2983
2984                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2985                                         deprecate = 1;
2986                                         ifp->flags |= IFA_F_DEPRECATED;
2987                                 }
2988
2989                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2990                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2991
2992                                 spin_unlock(&ifp->lock);
2993
2994                                 if (deprecate) {
2995                                         in6_ifa_hold(ifp);
2996                                         read_unlock(&addrconf_hash_lock);
2997
2998                                         ipv6_ifa_notify(0, ifp);
2999                                         in6_ifa_put(ifp);
3000                                         goto restart;
3001                                 }
3002 #ifdef CONFIG_IPV6_PRIVACY
3003                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3004                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3005                                 if (age >= ifp->prefered_lft - regen_advance) {
3006                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3007                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3008                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3009                                         if (!ifp->regen_count && ifpub) {
3010                                                 ifp->regen_count++;
3011                                                 in6_ifa_hold(ifp);
3012                                                 in6_ifa_hold(ifpub);
3013                                                 spin_unlock(&ifp->lock);
3014                                                 read_unlock(&addrconf_hash_lock);
3015                                                 spin_lock(&ifpub->lock);
3016                                                 ifpub->regen_count = 0;
3017                                                 spin_unlock(&ifpub->lock);
3018                                                 ipv6_create_tempaddr(ifpub, ifp);
3019                                                 in6_ifa_put(ifpub);
3020                                                 in6_ifa_put(ifp);
3021                                                 goto restart;
3022                                         }
3023                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3024                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3025                                 spin_unlock(&ifp->lock);
3026 #endif
3027                         } else {
3028                                 /* ifp->prefered_lft <= ifp->valid_lft */
3029                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3030                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3031                                 spin_unlock(&ifp->lock);
3032                         }
3033                 }
3034                 read_unlock(&addrconf_hash_lock);
3035         }
3036
3037         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3038         add_timer(&addr_chk_timer);
3039         spin_unlock_bh(&addrconf_verify_lock);
3040 }
3041
3042 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3043 {
3044         struct in6_addr *pfx = NULL;
3045
3046         if (addr)
3047                 pfx = nla_data(addr);
3048
3049         if (local) {
3050                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3051                         pfx = NULL;
3052                 else
3053                         pfx = nla_data(local);
3054         }
3055
3056         return pfx;
3057 }
3058
3059 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3060         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3061         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3062         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3063 };
3064
3065 static int
3066 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3067 {
3068         struct net *net = skb->sk->sk_net;
3069         struct ifaddrmsg *ifm;
3070         struct nlattr *tb[IFA_MAX+1];
3071         struct in6_addr *pfx;
3072         int err;
3073
3074         if (net != &init_net)
3075                 return -EINVAL;
3076
3077         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3078         if (err < 0)
3079                 return err;
3080
3081         ifm = nlmsg_data(nlh);
3082         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3083         if (pfx == NULL)
3084                 return -EINVAL;
3085
3086         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3087 }
3088
3089 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3090                              u32 prefered_lft, u32 valid_lft)
3091 {
3092         u32 flags = RTF_EXPIRES;
3093
3094         if (!valid_lft || (prefered_lft > valid_lft))
3095                 return -EINVAL;
3096
3097         if (valid_lft == INFINITY_LIFE_TIME) {
3098                 ifa_flags |= IFA_F_PERMANENT;
3099                 flags = 0;
3100         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3101                 valid_lft = 0x7FFFFFFF/HZ;
3102
3103         if (prefered_lft == 0)
3104                 ifa_flags |= IFA_F_DEPRECATED;
3105         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3106                  (prefered_lft != INFINITY_LIFE_TIME))
3107                 prefered_lft = 0x7FFFFFFF/HZ;
3108
3109         spin_lock_bh(&ifp->lock);
3110         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3111         ifp->tstamp = jiffies;
3112         ifp->valid_lft = valid_lft;
3113         ifp->prefered_lft = prefered_lft;
3114
3115         spin_unlock_bh(&ifp->lock);
3116         if (!(ifp->flags&IFA_F_TENTATIVE))
3117                 ipv6_ifa_notify(0, ifp);
3118
3119         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3120                               jiffies_to_clock_t(valid_lft * HZ), flags);
3121         addrconf_verify(0);
3122
3123         return 0;
3124 }
3125
3126 static int
3127 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3128 {
3129         struct net *net = skb->sk->sk_net;
3130         struct ifaddrmsg *ifm;
3131         struct nlattr *tb[IFA_MAX+1];
3132         struct in6_addr *pfx;
3133         struct inet6_ifaddr *ifa;
3134         struct net_device *dev;
3135         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3136         u8 ifa_flags;
3137         int err;
3138
3139         if (net != &init_net)
3140                 return -EINVAL;
3141
3142         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3143         if (err < 0)
3144                 return err;
3145
3146         ifm = nlmsg_data(nlh);
3147         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3148         if (pfx == NULL)
3149                 return -EINVAL;
3150
3151         if (tb[IFA_CACHEINFO]) {
3152                 struct ifa_cacheinfo *ci;
3153
3154                 ci = nla_data(tb[IFA_CACHEINFO]);
3155                 valid_lft = ci->ifa_valid;
3156                 preferred_lft = ci->ifa_prefered;
3157         } else {
3158                 preferred_lft = INFINITY_LIFE_TIME;
3159                 valid_lft = INFINITY_LIFE_TIME;
3160         }
3161
3162         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3163         if (dev == NULL)
3164                 return -ENODEV;
3165
3166         /* We ignore other flags so far. */
3167         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3168
3169         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3170         if (ifa == NULL) {
3171                 /*
3172                  * It would be best to check for !NLM_F_CREATE here but
3173                  * userspace alreay relies on not having to provide this.
3174                  */
3175                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3176                                       ifa_flags, preferred_lft, valid_lft);
3177         }
3178
3179         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3180             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3181                 err = -EEXIST;
3182         else
3183                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3184
3185         in6_ifa_put(ifa);
3186
3187         return err;
3188 }
3189
3190 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3191                           u8 scope, int ifindex)
3192 {
3193         struct ifaddrmsg *ifm;
3194
3195         ifm = nlmsg_data(nlh);
3196         ifm->ifa_family = AF_INET6;
3197         ifm->ifa_prefixlen = prefixlen;
3198         ifm->ifa_flags = flags;
3199         ifm->ifa_scope = scope;
3200         ifm->ifa_index = ifindex;
3201 }
3202
3203 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3204                          unsigned long tstamp, u32 preferred, u32 valid)
3205 {
3206         struct ifa_cacheinfo ci;
3207
3208         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3209                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3210         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3211                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3212         ci.ifa_prefered = preferred;
3213         ci.ifa_valid = valid;
3214
3215         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3216 }
3217
3218 static inline int rt_scope(int ifa_scope)
3219 {
3220         if (ifa_scope & IFA_HOST)
3221                 return RT_SCOPE_HOST;
3222         else if (ifa_scope & IFA_LINK)
3223                 return RT_SCOPE_LINK;
3224         else if (ifa_scope & IFA_SITE)
3225                 return RT_SCOPE_SITE;
3226         else
3227                 return RT_SCOPE_UNIVERSE;
3228 }
3229
3230 static inline int inet6_ifaddr_msgsize(void)
3231 {
3232         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3233                + nla_total_size(16) /* IFA_ADDRESS */
3234                + nla_total_size(sizeof(struct ifa_cacheinfo));
3235 }
3236
3237 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3238                              u32 pid, u32 seq, int event, unsigned int flags)
3239 {
3240         struct nlmsghdr  *nlh;
3241         u32 preferred, valid;
3242
3243         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3244         if (nlh == NULL)
3245                 return -EMSGSIZE;
3246
3247         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3248                       ifa->idev->dev->ifindex);
3249
3250         if (!(ifa->flags&IFA_F_PERMANENT)) {
3251                 preferred = ifa->prefered_lft;
3252                 valid = ifa->valid_lft;
3253                 if (preferred != INFINITY_LIFE_TIME) {
3254                         long tval = (jiffies - ifa->tstamp)/HZ;
3255                         preferred -= tval;
3256                         if (valid != INFINITY_LIFE_TIME)
3257                                 valid -= tval;
3258                 }
3259         } else {
3260                 preferred = INFINITY_LIFE_TIME;
3261                 valid = INFINITY_LIFE_TIME;
3262         }
3263
3264         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3265             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3266                 nlmsg_cancel(skb, nlh);
3267                 return -EMSGSIZE;
3268         }
3269
3270         return nlmsg_end(skb, nlh);
3271 }
3272
3273 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3274                                 u32 pid, u32 seq, int event, u16 flags)
3275 {
3276         struct nlmsghdr  *nlh;
3277         u8 scope = RT_SCOPE_UNIVERSE;
3278         int ifindex = ifmca->idev->dev->ifindex;
3279
3280         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3281                 scope = RT_SCOPE_SITE;
3282
3283         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3284         if (nlh == NULL)
3285                 return -EMSGSIZE;
3286
3287         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3288         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3289             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3290                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3291                 nlmsg_cancel(skb, nlh);
3292                 return -EMSGSIZE;
3293         }
3294
3295         return nlmsg_end(skb, nlh);
3296 }
3297
3298 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3299                                 u32 pid, u32 seq, int event, unsigned int flags)
3300 {
3301         struct nlmsghdr  *nlh;
3302         u8 scope = RT_SCOPE_UNIVERSE;
3303         int ifindex = ifaca->aca_idev->dev->ifindex;
3304
3305         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3306                 scope = RT_SCOPE_SITE;
3307
3308         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3309         if (nlh == NULL)
3310                 return -EMSGSIZE;
3311
3312         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3313         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3314             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3315                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3316                 nlmsg_cancel(skb, nlh);
3317                 return -EMSGSIZE;
3318         }
3319
3320         return nlmsg_end(skb, nlh);
3321 }
3322
3323 enum addr_type_t
3324 {
3325         UNICAST_ADDR,
3326         MULTICAST_ADDR,
3327         ANYCAST_ADDR,
3328 };
3329
3330 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3331                            enum addr_type_t type)
3332 {
3333         int idx, ip_idx;
3334         int s_idx, s_ip_idx;
3335         int err = 1;
3336         struct net_device *dev;
3337         struct inet6_dev *idev = NULL;
3338         struct inet6_ifaddr *ifa;
3339         struct ifmcaddr6 *ifmca;
3340         struct ifacaddr6 *ifaca;
3341
3342         s_idx = cb->args[0];
3343         s_ip_idx = ip_idx = cb->args[1];
3344
3345         idx = 0;
3346         for_each_netdev(&init_net, dev) {
3347                 if (idx < s_idx)
3348                         goto cont;
3349                 if (idx > s_idx)
3350                         s_ip_idx = 0;
3351                 ip_idx = 0;
3352                 if ((idev = in6_dev_get(dev)) == NULL)
3353                         goto cont;
3354                 read_lock_bh(&idev->lock);
3355                 switch (type) {
3356                 case UNICAST_ADDR:
3357                         /* unicast address incl. temp addr */
3358                         for (ifa = idev->addr_list; ifa;
3359                              ifa = ifa->if_next, ip_idx++) {
3360                                 if (ip_idx < s_ip_idx)
3361                                         continue;
3362                                 err = inet6_fill_ifaddr(skb, ifa,
3363                                                         NETLINK_CB(cb->skb).pid,
3364                                                         cb->nlh->nlmsg_seq,
3365                                                         RTM_NEWADDR,
3366                                                         NLM_F_MULTI);
3367                         }
3368                         break;
3369                 case MULTICAST_ADDR:
3370                         /* multicast address */
3371                         for (ifmca = idev->mc_list; ifmca;
3372                              ifmca = ifmca->next, ip_idx++) {
3373                                 if (ip_idx < s_ip_idx)
3374                                         continue;
3375                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3376                                                           NETLINK_CB(cb->skb).pid,
3377                                                           cb->nlh->nlmsg_seq,
3378                                                           RTM_GETMULTICAST,
3379                                                           NLM_F_MULTI);
3380                         }
3381                         break;
3382                 case ANYCAST_ADDR:
3383                         /* anycast address */
3384                         for (ifaca = idev->ac_list; ifaca;
3385                              ifaca = ifaca->aca_next, ip_idx++) {
3386                                 if (ip_idx < s_ip_idx)
3387                                         continue;
3388                                 err = inet6_fill_ifacaddr(skb, ifaca,
3389                                                           NETLINK_CB(cb->skb).pid,
3390                                                           cb->nlh->nlmsg_seq,
3391                                                           RTM_GETANYCAST,
3392                                                           NLM_F_MULTI);
3393                         }
3394                         break;
3395                 default:
3396                         break;
3397                 }
3398                 read_unlock_bh(&idev->lock);
3399                 in6_dev_put(idev);
3400
3401                 if (err <= 0)
3402                         break;
3403 cont:
3404                 idx++;
3405         }
3406         cb->args[0] = idx;
3407         cb->args[1] = ip_idx;
3408         return skb->len;
3409 }
3410
3411 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3412 {
3413         struct net *net = skb->sk->sk_net;
3414         enum addr_type_t type = UNICAST_ADDR;
3415
3416         if (net != &init_net)
3417                 return 0;
3418
3419         return inet6_dump_addr(skb, cb, type);
3420 }
3421
3422 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3423 {
3424         struct net *net = skb->sk->sk_net;
3425         enum addr_type_t type = MULTICAST_ADDR;
3426
3427         if (net != &init_net)
3428                 return 0;
3429
3430         return inet6_dump_addr(skb, cb, type);
3431 }
3432
3433
3434 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3435 {
3436         struct net *net = skb->sk->sk_net;
3437         enum addr_type_t type = ANYCAST_ADDR;
3438
3439         if (net != &init_net)
3440                 return 0;
3441
3442         return inet6_dump_addr(skb, cb, type);
3443 }
3444
3445 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3446                              void *arg)
3447 {
3448         struct net *net = in_skb->sk->sk_net;
3449         struct ifaddrmsg *ifm;
3450         struct nlattr *tb[IFA_MAX+1];
3451         struct in6_addr *addr = NULL;
3452         struct net_device *dev = NULL;
3453         struct inet6_ifaddr *ifa;
3454         struct sk_buff *skb;
3455         int err;
3456
3457         if (net != &init_net)
3458                 return -EINVAL;
3459
3460         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3461         if (err < 0)
3462                 goto errout;
3463
3464         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3465         if (addr == NULL) {
3466                 err = -EINVAL;
3467                 goto errout;
3468         }
3469
3470         ifm = nlmsg_data(nlh);
3471         if (ifm->ifa_index)
3472                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3473
3474         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3475                 err = -EADDRNOTAVAIL;
3476                 goto errout;
3477         }
3478
3479         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3480                 err = -ENOBUFS;
3481                 goto errout_ifa;
3482         }
3483
3484         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3485                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3486         if (err < 0) {
3487                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3488                 WARN_ON(err == -EMSGSIZE);
3489                 kfree_skb(skb);
3490                 goto errout_ifa;
3491         }
3492         err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3493 errout_ifa:
3494         in6_ifa_put(ifa);
3495 errout:
3496         return err;
3497 }
3498
3499 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3500 {
3501         struct sk_buff *skb;
3502         int err = -ENOBUFS;
3503
3504         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3505         if (skb == NULL)
3506                 goto errout;
3507
3508         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3509         if (err < 0) {
3510                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3511                 WARN_ON(err == -EMSGSIZE);
3512                 kfree_skb(skb);
3513                 goto errout;
3514         }
3515         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3516 errout:
3517         if (err < 0)
3518                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3519 }
3520
3521 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3522                                 __s32 *array, int bytes)
3523 {
3524         BUG_ON(bytes < (DEVCONF_MAX * 4));
3525
3526         memset(array, 0, bytes);
3527         array[DEVCONF_FORWARDING] = cnf->forwarding;
3528         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3529         array[DEVCONF_MTU6] = cnf->mtu6;
3530         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3531         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3532         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3533         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3534         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3535         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3536         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3537         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3538 #ifdef CONFIG_IPV6_PRIVACY
3539         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3540         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3541         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3542         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3543         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3544 #endif
3545         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3546         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3547         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3548 #ifdef CONFIG_IPV6_ROUTER_PREF
3549         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3550         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3551 #ifdef CONFIG_IPV6_ROUTE_INFO
3552         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3553 #endif
3554 #endif
3555         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3556         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3557 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3558         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3559 #endif
3560 }
3561
3562 static inline size_t inet6_if_nlmsg_size(void)
3563 {
3564         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3565                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3566                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3567                + nla_total_size(4) /* IFLA_MTU */
3568                + nla_total_size(4) /* IFLA_LINK */
3569                + nla_total_size( /* IFLA_PROTINFO */
3570                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3571                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3572                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3573                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3574                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3575                  );
3576 }
3577
3578 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3579                                       int bytes)
3580 {
3581         int i;
3582         int pad = bytes - sizeof(u64) * items;
3583         BUG_ON(pad < 0);
3584
3585         /* Use put_unaligned() because stats may not be aligned for u64. */
3586         put_unaligned(items, &stats[0]);
3587         for (i = 1; i < items; i++)
3588                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3589
3590         memset(&stats[items], 0, pad);
3591 }
3592
3593 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3594                              int bytes)
3595 {
3596         switch(attrtype) {
3597         case IFLA_INET6_STATS:
3598                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3599                 break;
3600         case IFLA_INET6_ICMP6STATS:
3601                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3602                 break;
3603         }
3604 }
3605
3606 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3607                              u32 pid, u32 seq, int event, unsigned int flags)
3608 {
3609         struct net_device *dev = idev->dev;
3610         struct nlattr *nla;
3611         struct ifinfomsg *hdr;
3612         struct nlmsghdr *nlh;
3613         void *protoinfo;
3614         struct ifla_cacheinfo ci;
3615
3616         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3617         if (nlh == NULL)
3618                 return -EMSGSIZE;
3619
3620         hdr = nlmsg_data(nlh);
3621         hdr->ifi_family = AF_INET6;
3622         hdr->__ifi_pad = 0;
3623         hdr->ifi_type = dev->type;
3624         hdr->ifi_index = dev->ifindex;
3625         hdr->ifi_flags = dev_get_flags(dev);
3626         hdr->ifi_change = 0;
3627
3628         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3629
3630         if (dev->addr_len)
3631                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3632
3633         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3634         if (dev->ifindex != dev->iflink)
3635                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3636
3637         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3638         if (protoinfo == NULL)
3639                 goto nla_put_failure;
3640
3641         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3642
3643         ci.max_reasm_len = IPV6_MAXPLEN;
3644         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3645                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3646         ci.reachable_time = idev->nd_parms->reachable_time;
3647         ci.retrans_time = idev->nd_parms->retrans_time;
3648         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3649
3650         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3651         if (nla == NULL)
3652                 goto nla_put_failure;
3653         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3654
3655         /* XXX - MC not implemented */
3656
3657         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3658         if (nla == NULL)
3659                 goto nla_put_failure;
3660         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3661
3662         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3663         if (nla == NULL)
3664                 goto nla_put_failure;
3665         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3666
3667         nla_nest_end(skb, protoinfo);
3668         return nlmsg_end(skb, nlh);
3669
3670 nla_put_failure:
3671         nlmsg_cancel(skb, nlh);
3672         return -EMSGSIZE;
3673 }
3674
3675 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3676 {
3677         struct net *net = skb->sk->sk_net;
3678         int idx, err;
3679         int s_idx = cb->args[0];
3680         struct net_device *dev;
3681         struct inet6_dev *idev;
3682
3683         if (net != &init_net)
3684                 return 0;
3685
3686         read_lock(&dev_base_lock);
3687         idx = 0;
3688         for_each_netdev(&init_net, dev) {
3689                 if (idx < s_idx)
3690                         goto cont;
3691                 if ((idev = in6_dev_get(dev)) == NULL)
3692                         goto cont;
3693                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3694                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3695                 in6_dev_put(idev);
3696                 if (err <= 0)
3697                         break;
3698 cont:
3699                 idx++;
3700         }
3701         read_unlock(&dev_base_lock);
3702         cb->args[0] = idx;
3703
3704         return skb->len;
3705 }
3706
3707 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3708 {
3709         struct sk_buff *skb;
3710         int err = -ENOBUFS;
3711
3712         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3713         if (skb == NULL)
3714                 goto errout;
3715
3716         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3717         if (err < 0) {
3718                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3719                 WARN_ON(err == -EMSGSIZE);
3720                 kfree_skb(skb);
3721                 goto errout;
3722         }
3723         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3724 errout:
3725         if (err < 0)
3726                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3727 }
3728
3729 static inline size_t inet6_prefix_nlmsg_size(void)
3730 {
3731         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3732                + nla_total_size(sizeof(struct in6_addr))
3733                + nla_total_size(sizeof(struct prefix_cacheinfo));
3734 }
3735
3736 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3737                              struct prefix_info *pinfo, u32 pid, u32 seq,
3738                              int event, unsigned int flags)
3739 {
3740         struct prefixmsg *pmsg;
3741         struct nlmsghdr *nlh;
3742         struct prefix_cacheinfo ci;
3743
3744         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3745         if (nlh == NULL)
3746                 return -EMSGSIZE;
3747
3748         pmsg = nlmsg_data(nlh);
3749         pmsg->prefix_family = AF_INET6;
3750         pmsg->prefix_pad1 = 0;
3751         pmsg->prefix_pad2 = 0;
3752         pmsg->prefix_ifindex = idev->dev->ifindex;
3753         pmsg->prefix_len = pinfo->prefix_len;
3754         pmsg->prefix_type = pinfo->type;
3755         pmsg->prefix_pad3 = 0;
3756         pmsg->prefix_flags = 0;
3757         if (pinfo->onlink)
3758                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3759         if (pinfo->autoconf)
3760                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3761
3762         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3763
3764         ci.preferred_time = ntohl(pinfo->prefered);
3765         ci.valid_time = ntohl(pinfo->valid);
3766         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3767
3768         return nlmsg_end(skb, nlh);
3769
3770 nla_put_failure:
3771         nlmsg_cancel(skb, nlh);
3772         return -EMSGSIZE;
3773 }
3774
3775 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3776                          struct prefix_info *pinfo)
3777 {
3778         struct sk_buff *skb;
3779         int err = -ENOBUFS;
3780
3781         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3782         if (skb == NULL)
3783                 goto errout;
3784
3785         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3786         if (err < 0) {
3787                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3788                 WARN_ON(err == -EMSGSIZE);
3789                 kfree_skb(skb);
3790                 goto errout;
3791         }
3792         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3793 errout:
3794         if (err < 0)
3795                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3796 }
3797
3798 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3799 {
3800         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3801
3802         switch (event) {
3803         case RTM_NEWADDR:
3804                 /*
3805                  * If the address was optimistic
3806                  * we inserted the route at the start of
3807                  * our DAD process, so we don't need
3808                  * to do it again
3809                  */
3810                 if (!(ifp->rt->rt6i_node))
3811                         ip6_ins_rt(ifp->rt);
3812                 if (ifp->idev->cnf.forwarding)
3813                         addrconf_join_anycast(ifp);
3814                 break;
3815         case RTM_DELADDR:
3816                 if (ifp->idev->cnf.forwarding)
3817                         addrconf_leave_anycast(ifp);
3818                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3819                 dst_hold(&ifp->rt->u.dst);
3820                 if (ip6_del_rt(ifp->rt))
3821                         dst_free(&ifp->rt->u.dst);
3822                 break;
3823         }
3824 }
3825
3826 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3827 {
3828         rcu_read_lock_bh();
3829         if (likely(ifp->idev->dead == 0))
3830                 __ipv6_ifa_notify(event, ifp);
3831         rcu_read_unlock_bh();
3832 }
3833
3834 #ifdef CONFIG_SYSCTL
3835
3836 static
3837 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3838                            void __user *buffer, size_t *lenp, loff_t *ppos)
3839 {
3840         int *valp = ctl->data;
3841         int val = *valp;
3842         int ret;
3843
3844         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3845
3846         if (write)
3847                 addrconf_fixup_forwarding(ctl, valp, val);
3848         return ret;
3849 }
3850
3851 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3852                                             int __user *name, int nlen,
3853                                             void __user *oldval,
3854                                             size_t __user *oldlenp,
3855                                             void __user *newval, size_t newlen)
3856 {
3857         int *valp = table->data;
3858         int val = *valp;
3859         int new;
3860
3861         if (!newval || !newlen)
3862                 return 0;
3863         if (newlen != sizeof(int))
3864                 return -EINVAL;
3865         if (get_user(new, (int __user *)newval))
3866                 return -EFAULT;
3867         if (new == *valp)
3868                 return 0;
3869         if (oldval && oldlenp) {
3870                 size_t len;
3871                 if (get_user(len, oldlenp))
3872                         return -EFAULT;
3873                 if (len) {
3874                         if (len > table->maxlen)
3875                                 len = table->maxlen;
3876                         if (copy_to_user(oldval, valp, len))
3877                                 return -EFAULT;
3878                         if (put_user(len, oldlenp))
3879                                 return -EFAULT;
3880                 }
3881         }
3882
3883         *valp = new;
3884         addrconf_fixup_forwarding(table, valp, val);
3885         return 1;
3886 }
3887
3888 static struct addrconf_sysctl_table
3889 {
3890         struct ctl_table_header *sysctl_header;
3891         ctl_table addrconf_vars[__NET_IPV6_MAX];
3892         char *dev_name;
3893 } addrconf_sysctl __read_mostly = {
3894         .sysctl_header = NULL,
3895         .addrconf_vars = {
3896                 {
3897                         .ctl_name       =       NET_IPV6_FORWARDING,
3898                         .procname       =       "forwarding",
3899                         .data           =       &ipv6_devconf.forwarding,
3900                         .maxlen         =       sizeof(int),
3901                         .mode           =       0644,
3902                         .proc_handler   =       &addrconf_sysctl_forward,
3903                         .strategy       =       &addrconf_sysctl_forward_strategy,
3904                 },
3905                 {
3906                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3907                         .procname       =       "hop_limit",
3908                         .data           =       &ipv6_devconf.hop_limit,
3909                         .maxlen         =       sizeof(int),
3910                         .mode           =       0644,
3911                         .proc_handler   =       proc_dointvec,
3912                 },
3913                 {
3914                         .ctl_name       =       NET_IPV6_MTU,
3915                         .procname       =       "mtu",
3916                         .data           =       &ipv6_devconf.mtu6,
3917                         .maxlen         =       sizeof(int),
3918                         .mode           =       0644,
3919                         .proc_handler   =       &proc_dointvec,
3920                 },
3921                 {
3922                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3923                         .procname       =       "accept_ra",
3924                         .data           =       &ipv6_devconf.accept_ra,
3925                         .maxlen         =       sizeof(int),
3926                         .mode           =       0644,
3927                         .proc_handler   =       &proc_dointvec,
3928                 },
3929                 {
3930                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3931                         .procname       =       "accept_redirects",
3932                         .data           =       &ipv6_devconf.accept_redirects,
3933                         .maxlen         =       sizeof(int),
3934                         .mode           =       0644,
3935                         .proc_handler   =       &proc_dointvec,
3936                 },
3937                 {
3938                         .ctl_name       =       NET_IPV6_AUTOCONF,
3939                         .procname       =       "autoconf",
3940                         .data           =       &ipv6_devconf.autoconf,
3941                         .maxlen         =       sizeof(int),
3942                         .mode           =       0644,
3943                         .proc_handler   =       &proc_dointvec,
3944                 },
3945                 {
3946                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3947                         .procname       =       "dad_transmits",
3948                         .data           =       &ipv6_devconf.dad_transmits,
3949                         .maxlen         =       sizeof(int),
3950                         .mode           =       0644,
3951                         .proc_handler   =       &proc_dointvec,
3952                 },
3953                 {
3954                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3955                         .procname       =       "router_solicitations",
3956                         .data           =       &ipv6_devconf.rtr_solicits,
3957                         .maxlen         =       sizeof(int),
3958                         .mode           =       0644,
3959                         .proc_handler   =       &proc_dointvec,
3960                 },
3961                 {
3962                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3963                         .procname       =       "router_solicitation_interval",
3964                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3965                         .maxlen         =       sizeof(int),
3966                         .mode           =       0644,
3967                         .proc_handler   =       &proc_dointvec_jiffies,
3968                         .strategy       =       &sysctl_jiffies,
3969                 },
3970                 {
3971                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3972                         .procname       =       "router_solicitation_delay",
3973                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3974                         .maxlen         =       sizeof(int),
3975                         .mode           =       0644,
3976                         .proc_handler   =       &proc_dointvec_jiffies,
3977                         .strategy       =       &sysctl_jiffies,
3978                 },
3979                 {
3980                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3981                         .procname       =       "force_mld_version",
3982                         .data           =       &ipv6_devconf.force_mld_version,
3983                         .maxlen         =       sizeof(int),
3984                         .mode           =       0644,
3985                         .proc_handler   =       &proc_dointvec,
3986                 },
3987 #ifdef CONFIG_IPV6_PRIVACY
3988                 {
3989                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3990                         .procname       =       "use_tempaddr",
3991                         .data           =       &ipv6_devconf.use_tempaddr,
3992                         .maxlen         =       sizeof(int),
3993                         .mode           =       0644,
3994                         .proc_handler   =       &proc_dointvec,
3995                 },
3996                 {
3997                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3998                         .procname       =       "temp_valid_lft",
3999                         .data           =       &ipv6_devconf.temp_valid_lft,
4000                         .maxlen         =       sizeof(int),
4001                         .mode           =       0644,
4002                         .proc_handler   =       &proc_dointvec,
4003                 },
4004                 {
4005                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4006                         .procname       =       "temp_prefered_lft",
4007                         .data           =       &ipv6_devconf.temp_prefered_lft,
4008                         .maxlen         =       sizeof(int),
4009                         .mode           =       0644,
4010                         .proc_handler   =       &proc_dointvec,
4011                 },
4012                 {
4013                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4014                         .procname       =       "regen_max_retry",
4015                         .data           =       &ipv6_devconf.regen_max_retry,
4016                         .maxlen         =       sizeof(int),
4017                         .mode           =       0644,
4018                         .proc_handler   =       &proc_dointvec,
4019                 },
4020                 {
4021                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4022                         .procname       =       "max_desync_factor",
4023                         .data           =       &ipv6_devconf.max_desync_factor,
4024                         .maxlen         =       sizeof(int),
4025                         .mode           =       0644,
4026                         .proc_handler   =       &proc_dointvec,
4027                 },
4028 #endif
4029                 {
4030                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4031                         .procname       =       "max_addresses",
4032                         .data           =       &ipv6_devconf.max_addresses,
4033                         .maxlen         =       sizeof(int),
4034                         .mode           =       0644,
4035                         .proc_handler   =       &proc_dointvec,
4036                 },
4037                 {
4038                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4039                         .procname       =       "accept_ra_defrtr",
4040                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4041                         .maxlen         =       sizeof(int),
4042                         .mode           =       0644,
4043                         .proc_handler   =       &proc_dointvec,
4044                 },
4045                 {
4046                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4047                         .procname       =       "accept_ra_pinfo",
4048                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4049                         .maxlen         =       sizeof(int),
4050                         .mode           =       0644,
4051                         .proc_handler   =       &proc_dointvec,
4052                 },
4053 #ifdef CONFIG_IPV6_ROUTER_PREF
4054                 {
4055                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4056                         .procname       =       "accept_ra_rtr_pref",
4057                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4058                         .maxlen         =       sizeof(int),
4059                         .mode           =       0644,
4060                         .proc_handler   =       &proc_dointvec,
4061                 },
4062                 {
4063                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4064                         .procname       =       "router_probe_interval",
4065                         .data           =       &ipv6_devconf.rtr_probe_interval,
4066                         .maxlen         =       sizeof(int),
4067                         .mode           =       0644,
4068                         .proc_handler   =       &proc_dointvec_jiffies,
4069                         .strategy       =       &sysctl_jiffies,
4070                 },
4071 #ifdef CONFIG_IPV6_ROUTE_INFO
4072                 {
4073                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4074                         .procname       =       "accept_ra_rt_info_max_plen",
4075                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4076                         .maxlen         =       sizeof(int),
4077                         .mode           =       0644,
4078                         .proc_handler   =       &proc_dointvec,
4079                 },
4080 #endif
4081 #endif
4082                 {
4083                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4084                         .procname       =       "proxy_ndp",
4085                         .data           =       &ipv6_devconf.proxy_ndp,
4086                         .maxlen         =       sizeof(int),
4087                         .mode           =       0644,
4088                         .proc_handler   =       &proc_dointvec,
4089                 },
4090                 {
4091                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4092                         .procname       =       "accept_source_route",
4093                         .data           =       &ipv6_devconf.accept_source_route,
4094                         .maxlen         =       sizeof(int),
4095                         .mode           =       0644,
4096                         .proc_handler   =       &proc_dointvec,
4097                 },
4098 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4099                 {
4100                         .ctl_name       =       CTL_UNNUMBERED,
4101                         .procname       =       "optimistic_dad",
4102                         .data           =       &ipv6_devconf.optimistic_dad,
4103                         .maxlen         =       sizeof(int),
4104                         .mode           =       0644,
4105                         .proc_handler   =       &proc_dointvec,
4106
4107                 },
4108 #endif
4109                 {
4110                         .ctl_name       =       0,      /* sentinel */
4111                 }
4112         },
4113 };
4114
4115 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4116                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4117 {
4118         int i;
4119         struct addrconf_sysctl_table *t;
4120
4121 #define ADDRCONF_CTL_PATH_DEV   3
4122
4123         struct ctl_path addrconf_ctl_path[] = {
4124                 { .procname = "net", .ctl_name = CTL_NET, },
4125                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4126                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4127                 { /* to be set */ },
4128                 { },
4129         };
4130
4131
4132         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4133         if (t == NULL)
4134                 goto out;
4135
4136         for (i=0; t->addrconf_vars[i].data; i++) {
4137                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4138                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4139                 t->addrconf_vars[i].extra2 = net;
4140         }
4141
4142         /*
4143          * Make a copy of dev_name, because '.procname' is regarded as const
4144          * by sysctl and we wouldn't want anyone to change it under our feet
4145          * (see SIOCSIFNAME).
4146          */
4147         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4148         if (!t->dev_name)
4149                 goto free;
4150
4151         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4152         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4153
4154         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4155                         t->addrconf_vars);
4156         if (t->sysctl_header == NULL)
4157                 goto free_procname;
4158
4159         p->sysctl = t;
4160         return 0;
4161
4162 free_procname:
4163         kfree(t->dev_name);
4164 free:
4165         kfree(t);
4166 out:
4167         return -ENOBUFS;
4168 }
4169
4170 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4171 {
4172         struct addrconf_sysctl_table *t;
4173
4174         if (p->sysctl == NULL)
4175                 return;
4176
4177         t = p->sysctl;
4178         p->sysctl = NULL;
4179         unregister_sysctl_table(t->sysctl_header);
4180         kfree(t->dev_name);
4181         kfree(t);
4182 }
4183
4184 static void addrconf_sysctl_register(struct inet6_dev *idev)
4185 {
4186         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4187                               NET_IPV6_NEIGH, "ipv6",
4188                               &ndisc_ifinfo_sysctl_change,
4189                               NULL);
4190         __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4191                         idev->dev->ifindex, idev, &idev->cnf);
4192 }
4193
4194 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4195 {
4196         __addrconf_sysctl_unregister(&idev->cnf);
4197         neigh_sysctl_unregister(idev->nd_parms);
4198 }
4199
4200
4201 #endif
4202
4203 static int addrconf_init_net(struct net *net)
4204 {
4205         int err;
4206         struct ipv6_devconf *all, *dflt;
4207
4208         err = -ENOMEM;
4209         all = &ipv6_devconf;
4210         dflt = &ipv6_devconf_dflt;
4211
4212         if (net != &init_net) {
4213                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4214                 if (all == NULL)
4215                         goto err_alloc_all;
4216
4217                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4218                 if (dflt == NULL)
4219                         goto err_alloc_dflt;
4220         }
4221
4222         net->ipv6.devconf_all = all;
4223         net->ipv6.devconf_dflt = dflt;
4224
4225 #ifdef CONFIG_SYSCTL
4226         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4227                         NULL, all);
4228         if (err < 0)
4229                 goto err_reg_all;
4230
4231         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4232                         NULL, dflt);
4233         if (err < 0)
4234                 goto err_reg_dflt;
4235 #endif
4236         return 0;
4237
4238 #ifdef CONFIG_SYSCTL
4239 err_reg_dflt:
4240         __addrconf_sysctl_unregister(all);
4241 err_reg_all:
4242         kfree(dflt);
4243 #endif
4244 err_alloc_dflt:
4245         kfree(all);
4246 err_alloc_all:
4247         return err;
4248 }
4249
4250 static void addrconf_exit_net(struct net *net)
4251 {
4252 #ifdef CONFIG_SYSCTL
4253         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4254         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4255 #endif
4256         if (net != &init_net) {
4257                 kfree(net->ipv6.devconf_dflt);
4258                 kfree(net->ipv6.devconf_all);
4259         }
4260 }
4261
4262 static struct pernet_operations addrconf_ops = {
4263         .init = addrconf_init_net,
4264         .exit = addrconf_exit_net,
4265 };
4266
4267 /*
4268  *      Device notifier
4269  */
4270
4271 int register_inet6addr_notifier(struct notifier_block *nb)
4272 {
4273         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4274 }
4275
4276 EXPORT_SYMBOL(register_inet6addr_notifier);
4277
4278 int unregister_inet6addr_notifier(struct notifier_block *nb)
4279 {
4280         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4281 }
4282
4283 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4284
4285 /*
4286  *      Init / cleanup code
4287  */
4288
4289 int __init addrconf_init(void)
4290 {
4291         int err;
4292
4293         if ((err = ipv6_addr_label_init()) < 0) {
4294                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4295                         err);
4296                 return err;
4297         }
4298
4299         register_pernet_subsys(&addrconf_ops);
4300
4301         /* The addrconf netdev notifier requires that loopback_dev
4302          * has it's ipv6 private information allocated and setup
4303          * before it can bring up and give link-local addresses
4304          * to other devices which are up.
4305          *
4306          * Unfortunately, loopback_dev is not necessarily the first
4307          * entry in the global dev_base list of net devices.  In fact,
4308          * it is likely to be the very last entry on that list.
4309          * So this causes the notifier registry below to try and
4310          * give link-local addresses to all devices besides loopback_dev
4311          * first, then loopback_dev, which cases all the non-loopback_dev
4312          * devices to fail to get a link-local address.
4313          *
4314          * So, as a temporary fix, allocate the ipv6 structure for
4315          * loopback_dev first by hand.
4316          * Longer term, all of the dependencies ipv6 has upon the loopback
4317          * device and it being up should be removed.
4318          */
4319         rtnl_lock();
4320         if (!ipv6_add_dev(init_net.loopback_dev))
4321                 err = -ENOMEM;
4322         rtnl_unlock();
4323         if (err)
4324                 goto errlo;
4325
4326         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4327         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4328 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4329         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4330         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4331         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4332         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4333 #endif
4334
4335         register_netdevice_notifier(&ipv6_dev_notf);
4336
4337         addrconf_verify(0);
4338
4339         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4340         if (err < 0)
4341                 goto errout;
4342
4343         /* Only the first call to __rtnl_register can fail */
4344         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4345         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4346         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4347         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4348         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4349
4350         ipv6_addr_label_rtnl_register();
4351
4352         return 0;
4353 errout:
4354         unregister_netdevice_notifier(&ipv6_dev_notf);
4355 errlo:
4356         unregister_pernet_subsys(&addrconf_ops);
4357
4358         return err;
4359 }
4360
4361 void addrconf_cleanup(void)
4362 {
4363         struct net_device *dev;
4364         struct inet6_ifaddr *ifa;
4365         int i;
4366
4367         unregister_netdevice_notifier(&ipv6_dev_notf);
4368
4369         unregister_pernet_subsys(&addrconf_ops);
4370
4371         rtnl_lock();
4372
4373         /*
4374          *      clean dev list.
4375          */
4376
4377         for_each_netdev(&init_net, dev) {
4378                 if (__in6_dev_get(dev) == NULL)
4379                         continue;
4380                 addrconf_ifdown(dev, 1);
4381         }
4382         addrconf_ifdown(init_net.loopback_dev, 2);
4383
4384         /*
4385          *      Check hash table.
4386          */
4387
4388         write_lock_bh(&addrconf_hash_lock);
4389         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4390                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4391                         struct inet6_ifaddr *bifa;
4392
4393                         bifa = ifa;
4394                         ifa = ifa->lst_next;
4395                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4396                         /* Do not free it; something is wrong.
4397                            Now we can investigate it with debugger.
4398                          */
4399                 }
4400         }
4401         write_unlock_bh(&addrconf_hash_lock);
4402
4403         del_timer(&addr_chk_timer);
4404
4405         rtnl_unlock();
4406 }