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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 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 226 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 227
 228 /* Check if a valid qdisc is available */
 229 static inline int addrconf_qdisc_ok(struct net_device *dev)
 230 {
 231         return (dev->qdisc != &noop_qdisc);
 232 }
 233
 234 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 235 {
 236         if (del_timer(&ifp->timer))
 237                 __in6_ifa_put(ifp);
 238 }
 239
 240 enum addrconf_timer_t
 241 {
 242         AC_NONE,
 243         AC_DAD,
 244         AC_RS,
 245 };
 246
 247 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 248                                enum addrconf_timer_t what,
 249                                unsigned long when)
 250 {
 251         if (!del_timer(&ifp->timer))
 252                 in6_ifa_hold(ifp);
 253
 254         switch (what) {
 255         case AC_DAD:
 256                 ifp->timer.function = addrconf_dad_timer;
 257                 break;
 258         case AC_RS:
 259                 ifp->timer.function = addrconf_rs_timer;
 260                 break;
 261         default:;
 262         }
 263         ifp->timer.expires = jiffies + when;
 264         add_timer(&ifp->timer);
 265 }
 266
 267 static int snmp6_alloc_dev(struct inet6_dev *idev)
 268 {
 269         if (snmp_mib_init((void **)idev->stats.ipv6,
 270                           sizeof(struct ipstats_mib)) < 0)
 271                 goto err_ip;
 272         if (snmp_mib_init((void **)idev->stats.icmpv6,
 273                           sizeof(struct icmpv6_mib)) < 0)
 274                 goto err_icmp;
 275         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 276                           sizeof(struct icmpv6msg_mib)) < 0)
 277                 goto err_icmpmsg;
 278
 279         return 0;
 280
 281 err_icmpmsg:
 282         snmp_mib_free((void **)idev->stats.icmpv6);
 283 err_icmp:
 284         snmp_mib_free((void **)idev->stats.ipv6);
 285 err_ip:
 286         return -ENOMEM;
 287 }
 288
 289 static void snmp6_free_dev(struct inet6_dev *idev)
 290 {
 291         snmp_mib_free((void **)idev->stats.icmpv6msg);
 292         snmp_mib_free((void **)idev->stats.icmpv6);
 293         snmp_mib_free((void **)idev->stats.ipv6);
 294 }
 295
 296 /* Nobody refers to this device, we may destroy it. */
 297
 298 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 299 {
 300         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 301         kfree(idev);
 302 }
 303
 304 void in6_dev_finish_destroy(struct inet6_dev *idev)
 305 {
 306         struct net_device *dev = idev->dev;
 307         BUG_TRAP(idev->addr_list==NULL);
 308         BUG_TRAP(idev->mc_list==NULL);
 309 #ifdef NET_REFCNT_DEBUG
 310         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 311 #endif
 312         dev_put(dev);
 313         if (!idev->dead) {
 314                 printk("Freeing alive inet6 device %p\n", idev);
 315                 return;
 316         }
 317         snmp6_free_dev(idev);
 318         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 319 }
 320
 321 EXPORT_SYMBOL(in6_dev_finish_destroy);
 322
 323 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 324 {
 325         struct inet6_dev *ndev;
 326
 327         ASSERT_RTNL();
 328
 329         if (dev->mtu < IPV6_MIN_MTU)
 330                 return NULL;
 331
 332         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 333
 334         if (ndev == NULL)
 335                 return NULL;
 336
 337         rwlock_init(&ndev->lock);
 338         ndev->dev = dev;
 339         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 340         ndev->cnf.mtu6 = dev->mtu;
 341         ndev->cnf.sysctl = NULL;
 342         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 343         if (ndev->nd_parms == NULL) {
 344                 kfree(ndev);
 345                 return NULL;
 346         }
 347         /* We refer to the device */
 348         dev_hold(dev);
 349
 350         if (snmp6_alloc_dev(ndev) < 0) {
 351                 ADBG((KERN_WARNING
 352                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 353                         __func__, dev->name));
 354                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 355                 ndev->dead = 1;
 356                 in6_dev_finish_destroy(ndev);
 357                 return NULL;
 358         }
 359
 360         if (snmp6_register_dev(ndev) < 0) {
 361                 ADBG((KERN_WARNING
 362                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 363                         __func__, dev->name));
 364                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 365                 ndev->dead = 1;
 366                 in6_dev_finish_destroy(ndev);
 367                 return NULL;
 368         }
 369
 370         /* One reference from device.  We must do this before
 371          * we invoke __ipv6_regen_rndid().
 372          */
 373         in6_dev_hold(ndev);
 374
 375 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 376         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 377                 printk(KERN_INFO
 378                        "%s: Disabled Multicast RS\n",
 379                        dev->name);
 380                 ndev->cnf.rtr_solicits = 0;
 381         }
 382 #endif
 383
 384 #ifdef CONFIG_IPV6_PRIVACY
 385         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 386         if ((dev->flags&IFF_LOOPBACK) ||
 387             dev->type == ARPHRD_TUNNEL ||
 388             dev->type == ARPHRD_TUNNEL6 ||
 389             dev->type == ARPHRD_SIT ||
 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_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 412
 413         return ndev;
 414 }
 415
 416 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 417 {
 418         struct inet6_dev *idev;
 419
 420         ASSERT_RTNL();
 421
 422         if ((idev = __in6_dev_get(dev)) == NULL) {
 423                 if ((idev = ipv6_add_dev(dev)) == NULL)
 424                         return NULL;
 425         }
 426
 427         if (dev->flags&IFF_UP)
 428                 ipv6_mc_up(idev);
 429         return idev;
 430 }
 431
 432 #ifdef CONFIG_SYSCTL
 433 static void dev_forward_change(struct inet6_dev *idev)
 434 {
 435         struct net_device *dev;
 436         struct inet6_ifaddr *ifa;
 437
 438         if (!idev)
 439                 return;
 440         dev = idev->dev;
 441         if (dev && (dev->flags & IFF_MULTICAST)) {
 442                 if (idev->cnf.forwarding)
 443                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 444                 else
 445                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 446         }
 447         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 448                 if (ifa->flags&IFA_F_TENTATIVE)
 449                         continue;
 450                 if (idev->cnf.forwarding)
 451                         addrconf_join_anycast(ifa);
 452                 else
 453                         addrconf_leave_anycast(ifa);
 454         }
 455 }
 456
 457
 458 static void addrconf_forward_change(struct net *net, __s32 newf)
 459 {
 460         struct net_device *dev;
 461         struct inet6_dev *idev;
 462
 463         read_lock(&dev_base_lock);
 464         for_each_netdev(net, dev) {
 465                 rcu_read_lock();
 466                 idev = __in6_dev_get(dev);
 467                 if (idev) {
 468                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 469                         idev->cnf.forwarding = newf;
 470                         if (changed)
 471                                 dev_forward_change(idev);
 472                 }
 473                 rcu_read_unlock();
 474         }
 475         read_unlock(&dev_base_lock);
 476 }
 477
 478 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 479 {
 480         struct net *net;
 481
 482         net = (struct net *)table->extra2;
 483         if (p == &net->ipv6.devconf_dflt->forwarding)
 484                 return;
 485
 486         if (p == &net->ipv6.devconf_all->forwarding) {
 487                 __s32 newf = net->ipv6.devconf_all->forwarding;
 488                 net->ipv6.devconf_dflt->forwarding = newf;
 489                 addrconf_forward_change(net, newf);
 490         } else if ((!*p) ^ (!old))
 491                 dev_forward_change((struct inet6_dev *)table->extra1);
 492
 493         if (*p)
 494                 rt6_purge_dflt_routers(net);
 495 }
 496 #endif
 497
 498 /* Nobody refers to this ifaddr, destroy it */
 499
 500 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 501 {
 502         BUG_TRAP(ifp->if_next==NULL);
 503         BUG_TRAP(ifp->lst_next==NULL);
 504 #ifdef NET_REFCNT_DEBUG
 505         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 506 #endif
 507
 508         in6_dev_put(ifp->idev);
 509
 510         if (del_timer(&ifp->timer))
 511                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 512
 513         if (!ifp->dead) {
 514                 printk("Freeing alive inet6 address %p\n", ifp);
 515                 return;
 516         }
 517         dst_release(&ifp->rt->u.dst);
 518
 519         kfree(ifp);
 520 }
 521
 522 static void
 523 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 524 {
 525         struct inet6_ifaddr *ifa, **ifap;
 526         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 527
 528         /*
 529          * Each device address list is sorted in order of scope -
 530          * global before linklocal.
 531          */
 532         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 533              ifap = &ifa->if_next) {
 534                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 535                         break;
 536         }
 537
 538         ifp->if_next = *ifap;
 539         *ifap = ifp;
 540 }
 541
 542 /*
 543  *      Hash function taken from net_alias.c
 544  */
 545 static u8 ipv6_addr_hash(const struct in6_addr *addr)
 546 {
 547         __u32 word;
 548
 549         /*
 550          * We perform the hash function over the last 64 bits of the address
 551          * This will include the IEEE address token on links that support it.
 552          */
 553
 554         word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
 555         word ^= (word >> 16);
 556         word ^= (word >> 8);
 557
 558         return ((word ^ (word >> 4)) & 0x0f);
 559 }
 560
 561 /* On success it returns ifp with increased reference count */
 562
 563 static struct inet6_ifaddr *
 564 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 565               int scope, u32 flags)
 566 {
 567         struct inet6_ifaddr *ifa = NULL;
 568         struct rt6_info *rt;
 569         int hash;
 570         int err = 0;
 571
 572         rcu_read_lock_bh();
 573         if (idev->dead) {
 574                 err = -ENODEV;                  /*XXX*/
 575                 goto out2;
 576         }
 577
 578         write_lock(&addrconf_hash_lock);
 579
 580         /* Ignore adding duplicate addresses on an interface */
 581         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 582                 ADBG(("ipv6_add_addr: already assigned\n"));
 583                 err = -EEXIST;
 584                 goto out;
 585         }
 586
 587         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 588
 589         if (ifa == NULL) {
 590                 ADBG(("ipv6_add_addr: malloc failed\n"));
 591                 err = -ENOBUFS;
 592                 goto out;
 593         }
 594
 595         rt = addrconf_dst_alloc(idev, addr, 0);
 596         if (IS_ERR(rt)) {
 597                 err = PTR_ERR(rt);
 598                 goto out;
 599         }
 600
 601         ipv6_addr_copy(&ifa->addr, addr);
 602
 603         spin_lock_init(&ifa->lock);
 604         init_timer(&ifa->timer);
 605         ifa->timer.data = (unsigned long) ifa;
 606         ifa->scope = scope;
 607         ifa->prefix_len = pfxlen;
 608         ifa->flags = flags | IFA_F_TENTATIVE;
 609         ifa->cstamp = ifa->tstamp = jiffies;
 610
 611         ifa->rt = rt;
 612
 613         /*
 614          * part one of RFC 4429, section 3.3
 615          * We should not configure an address as
 616          * optimistic if we do not yet know the link
 617          * layer address of our nexhop router
 618          */
 619
 620         if (rt->rt6i_nexthop == NULL)
 621                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 622
 623         ifa->idev = idev;
 624         in6_dev_hold(idev);
 625         /* For caller */
 626         in6_ifa_hold(ifa);
 627
 628         /* Add to big hash table */
 629         hash = ipv6_addr_hash(addr);
 630
 631         ifa->lst_next = inet6_addr_lst[hash];
 632         inet6_addr_lst[hash] = ifa;
 633         in6_ifa_hold(ifa);
 634         write_unlock(&addrconf_hash_lock);
 635
 636         write_lock(&idev->lock);
 637         /* Add to inet6_dev unicast addr list. */
 638         ipv6_link_dev_addr(idev, ifa);
 639
 640 #ifdef CONFIG_IPV6_PRIVACY
 641         if (ifa->flags&IFA_F_TEMPORARY) {
 642                 ifa->tmp_next = idev->tempaddr_list;
 643                 idev->tempaddr_list = ifa;
 644                 in6_ifa_hold(ifa);
 645         }
 646 #endif
 647
 648         in6_ifa_hold(ifa);
 649         write_unlock(&idev->lock);
 650 out2:
 651         rcu_read_unlock_bh();
 652
 653         if (likely(err == 0))
 654                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 655         else {
 656                 kfree(ifa);
 657                 ifa = ERR_PTR(err);
 658         }
 659
 660         return ifa;
 661 out:
 662         write_unlock(&addrconf_hash_lock);
 663         goto out2;
 664 }
 665
 666 /* This function wants to get referenced ifp and releases it before return */
 667
 668 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 669 {
 670         struct inet6_ifaddr *ifa, **ifap;
 671         struct inet6_dev *idev = ifp->idev;
 672         int hash;
 673         int deleted = 0, onlink = 0;
 674         unsigned long expires = jiffies;
 675
 676         hash = ipv6_addr_hash(&ifp->addr);
 677
 678         ifp->dead = 1;
 679
 680         write_lock_bh(&addrconf_hash_lock);
 681         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 682              ifap = &ifa->lst_next) {
 683                 if (ifa == ifp) {
 684                         *ifap = ifa->lst_next;
 685                         __in6_ifa_put(ifp);
 686                         ifa->lst_next = NULL;
 687                         break;
 688                 }
 689         }
 690         write_unlock_bh(&addrconf_hash_lock);
 691
 692         write_lock_bh(&idev->lock);
 693 #ifdef CONFIG_IPV6_PRIVACY
 694         if (ifp->flags&IFA_F_TEMPORARY) {
 695                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 696                      ifap = &ifa->tmp_next) {
 697                         if (ifa == ifp) {
 698                                 *ifap = ifa->tmp_next;
 699                                 if (ifp->ifpub) {
 700                                         in6_ifa_put(ifp->ifpub);
 701                                         ifp->ifpub = NULL;
 702                                 }
 703                                 __in6_ifa_put(ifp);
 704                                 ifa->tmp_next = NULL;
 705                                 break;
 706                         }
 707                 }
 708         }
 709 #endif
 710
 711         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 712                 if (ifa == ifp) {
 713                         *ifap = ifa->if_next;
 714                         __in6_ifa_put(ifp);
 715                         ifa->if_next = NULL;
 716                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 717                                 break;
 718                         deleted = 1;
 719                         continue;
 720                 } else if (ifp->flags & IFA_F_PERMANENT) {
 721                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 722                                               ifp->prefix_len)) {
 723                                 if (ifa->flags & IFA_F_PERMANENT) {
 724                                         onlink = 1;
 725                                         if (deleted)
 726                                                 break;
 727                                 } else {
 728                                         unsigned long lifetime;
 729
 730                                         if (!onlink)
 731                                                 onlink = -1;
 732
 733                                         spin_lock(&ifa->lock);
 734                                         lifetime = min_t(unsigned long,
 735                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 736                                         if (time_before(expires,
 737                                                         ifa->tstamp + lifetime * HZ))
 738                                                 expires = ifa->tstamp + lifetime * HZ;
 739                                         spin_unlock(&ifa->lock);
 740                                 }
 741                         }
 742                 }
 743                 ifap = &ifa->if_next;
 744         }
 745         write_unlock_bh(&idev->lock);
 746
 747         ipv6_ifa_notify(RTM_DELADDR, ifp);
 748
 749         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 750
 751         addrconf_del_timer(ifp);
 752
 753         /*
 754          * Purge or update corresponding prefix
 755          *
 756          * 1) we don't purge prefix here if address was not permanent.
 757          *    prefix is managed by its own lifetime.
 758          * 2) if there're no addresses, delete prefix.
 759          * 3) if there're still other permanent address(es),
 760          *    corresponding prefix is still permanent.
 761          * 4) otherwise, update prefix lifetime to the
 762          *    longest valid lifetime among the corresponding
 763          *    addresses on the device.
 764          *    Note: subsequent RA will update lifetime.
 765          *
 766          * --yoshfuji
 767          */
 768         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 769                 struct in6_addr prefix;
 770                 struct rt6_info *rt;
 771                 struct net *net = dev_net(ifp->idev->dev);
 772                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 773                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 774
 775                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 776                         if (onlink == 0) {
 777                                 ip6_del_rt(rt);
 778                                 rt = NULL;
 779                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 780                                 rt->rt6i_expires = expires;
 781                                 rt->rt6i_flags |= RTF_EXPIRES;
 782                         }
 783                 }
 784                 dst_release(&rt->u.dst);
 785         }
 786
 787         in6_ifa_put(ifp);
 788 }
 789
 790 #ifdef CONFIG_IPV6_PRIVACY
 791 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 792 {
 793         struct inet6_dev *idev = ifp->idev;
 794         struct in6_addr addr, *tmpaddr;
 795         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 796         unsigned long regen_advance;
 797         int tmp_plen;
 798         int ret = 0;
 799         int max_addresses;
 800         u32 addr_flags;
 801
 802         write_lock(&idev->lock);
 803         if (ift) {
 804                 spin_lock_bh(&ift->lock);
 805                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 806                 spin_unlock_bh(&ift->lock);
 807                 tmpaddr = &addr;
 808         } else {
 809                 tmpaddr = NULL;
 810         }
 811 retry:
 812         in6_dev_hold(idev);
 813         if (idev->cnf.use_tempaddr <= 0) {
 814                 write_unlock(&idev->lock);
 815                 printk(KERN_INFO
 816                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 817                 in6_dev_put(idev);
 818                 ret = -1;
 819                 goto out;
 820         }
 821         spin_lock_bh(&ifp->lock);
 822         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 823                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 824                 spin_unlock_bh(&ifp->lock);
 825                 write_unlock(&idev->lock);
 826                 printk(KERN_WARNING
 827                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 828                 in6_dev_put(idev);
 829                 ret = -1;
 830                 goto out;
 831         }
 832         in6_ifa_hold(ifp);
 833         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 834         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 835                 spin_unlock_bh(&ifp->lock);
 836                 write_unlock(&idev->lock);
 837                 printk(KERN_WARNING
 838                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 839                 in6_ifa_put(ifp);
 840                 in6_dev_put(idev);
 841                 ret = -1;
 842                 goto out;
 843         }
 844         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 845         tmp_valid_lft = min_t(__u32,
 846                               ifp->valid_lft,
 847                               idev->cnf.temp_valid_lft);
 848         tmp_prefered_lft = min_t(__u32,
 849                                  ifp->prefered_lft,
 850                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 851         tmp_plen = ifp->prefix_len;
 852         max_addresses = idev->cnf.max_addresses;
 853         tmp_cstamp = ifp->cstamp;
 854         tmp_tstamp = ifp->tstamp;
 855         spin_unlock_bh(&ifp->lock);
 856
 857         regen_advance = idev->cnf.regen_max_retry *
 858                         idev->cnf.dad_transmits *
 859                         idev->nd_parms->retrans_time / HZ;
 860         write_unlock(&idev->lock);
 861
 862         /* A temporary address is created only if this calculated Preferred
 863          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 864          * an implementation must not create a temporary address with a zero
 865          * Preferred Lifetime.
 866          */
 867         if (tmp_prefered_lft <= regen_advance) {
 868                 in6_ifa_put(ifp);
 869                 in6_dev_put(idev);
 870                 ret = -1;
 871                 goto out;
 872         }
 873
 874         addr_flags = IFA_F_TEMPORARY;
 875         /* set in addrconf_prefix_rcv() */
 876         if (ifp->flags & IFA_F_OPTIMISTIC)
 877                 addr_flags |= IFA_F_OPTIMISTIC;
 878
 879         ift = !max_addresses ||
 880               ipv6_count_addresses(idev) < max_addresses ?
 881                 ipv6_add_addr(idev, &addr, tmp_plen,
 882                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 883                               addr_flags) : NULL;
 884         if (!ift || IS_ERR(ift)) {
 885                 in6_ifa_put(ifp);
 886                 in6_dev_put(idev);
 887                 printk(KERN_INFO
 888                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 889                 tmpaddr = &addr;
 890                 write_lock(&idev->lock);
 891                 goto retry;
 892         }
 893
 894         spin_lock_bh(&ift->lock);
 895         ift->ifpub = ifp;
 896         ift->valid_lft = tmp_valid_lft;
 897         ift->prefered_lft = tmp_prefered_lft;
 898         ift->cstamp = tmp_cstamp;
 899         ift->tstamp = tmp_tstamp;
 900         spin_unlock_bh(&ift->lock);
 901
 902         addrconf_dad_start(ift, 0);
 903         in6_ifa_put(ift);
 904         in6_dev_put(idev);
 905 out:
 906         return ret;
 907 }
 908 #endif
 909
 910 /*
 911  *      Choose an appropriate source address (RFC3484)
 912  */
 913 enum {
 914         IPV6_SADDR_RULE_INIT = 0,
 915         IPV6_SADDR_RULE_LOCAL,
 916         IPV6_SADDR_RULE_SCOPE,
 917         IPV6_SADDR_RULE_PREFERRED,
 918 #ifdef CONFIG_IPV6_MIP6
 919         IPV6_SADDR_RULE_HOA,
 920 #endif
 921         IPV6_SADDR_RULE_OIF,
 922         IPV6_SADDR_RULE_LABEL,
 923 #ifdef CONFIG_IPV6_PRIVACY
 924         IPV6_SADDR_RULE_PRIVACY,
 925 #endif
 926         IPV6_SADDR_RULE_ORCHID,
 927         IPV6_SADDR_RULE_PREFIX,
 928         IPV6_SADDR_RULE_MAX
 929 };
 930
 931 struct ipv6_saddr_score {
 932         int                     rule;
 933         int                     addr_type;
 934         struct inet6_ifaddr     *ifa;
 935         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 936         int                     scopedist;
 937         int                     matchlen;
 938 };
 939
 940 struct ipv6_saddr_dst {
 941         const struct in6_addr *addr;
 942         int ifindex;
 943         int scope;
 944         int label;
 945         unsigned int prefs;
 946 };
 947
 948 static inline int ipv6_saddr_preferred(int type)
 949 {
 950         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 951                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 952                 return 1;
 953         return 0;
 954 }
 955
 956 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
 957                                struct ipv6_saddr_dst *dst,
 958                                int i)
 959 {
 960         int ret;
 961
 962         if (i <= score->rule) {
 963                 switch (i) {
 964                 case IPV6_SADDR_RULE_SCOPE:
 965                         ret = score->scopedist;
 966                         break;
 967                 case IPV6_SADDR_RULE_PREFIX:
 968                         ret = score->matchlen;
 969                         break;
 970                 default:
 971                         ret = !!test_bit(i, score->scorebits);
 972                 }
 973                 goto out;
 974         }
 975
 976         switch (i) {
 977         case IPV6_SADDR_RULE_INIT:
 978                 /* Rule 0: remember if hiscore is not ready yet */
 979                 ret = !!score->ifa;
 980                 break;
 981         case IPV6_SADDR_RULE_LOCAL:
 982                 /* Rule 1: Prefer same address */
 983                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
 984                 break;
 985         case IPV6_SADDR_RULE_SCOPE:
 986                 /* Rule 2: Prefer appropriate scope
 987                  *
 988                  *      ret
 989                  *       ^
 990                  *    -1 |  d 15
 991                  *    ---+--+-+---> scope
 992                  *       |
 993                  *       |             d is scope of the destination.
 994                  *  B-d  |  \
 995                  *       |   \      <- smaller scope is better if
 996                  *  B-15 |    \        if scope is enough for destinaion.
 997                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
 998                  * d-C-1 | /
 999                  *       |/         <- greater is better
1000                  *   -C  /             if scope is not enough for destination.
1001                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1002                  *
1003                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1004                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1005                  * Assume B = 0 and we get C > 29.
1006                  */
1007                 ret = __ipv6_addr_src_scope(score->addr_type);
1008                 if (ret >= dst->scope)
1009                         ret = -ret;
1010                 else
1011                         ret -= 128;     /* 30 is enough */
1012                 score->scopedist = ret;
1013                 break;
1014         case IPV6_SADDR_RULE_PREFERRED:
1015                 /* Rule 3: Avoid deprecated and optimistic addresses */
1016                 ret = ipv6_saddr_preferred(score->addr_type) ||
1017                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1018                 break;
1019 #ifdef CONFIG_IPV6_MIP6
1020         case IPV6_SADDR_RULE_HOA:
1021             {
1022                 /* Rule 4: Prefer home address */
1023                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1024                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1025                 break;
1026             }
1027 #endif
1028         case IPV6_SADDR_RULE_OIF:
1029                 /* Rule 5: Prefer outgoing interface */
1030                 ret = (!dst->ifindex ||
1031                        dst->ifindex == score->ifa->idev->dev->ifindex);
1032                 break;
1033         case IPV6_SADDR_RULE_LABEL:
1034                 /* Rule 6: Prefer matching label */
1035                 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1036                                       score->ifa->idev->dev->ifindex) == dst->label;
1037                 break;
1038 #ifdef CONFIG_IPV6_PRIVACY
1039         case IPV6_SADDR_RULE_PRIVACY:
1040             {
1041                 /* Rule 7: Prefer public address
1042                  * Note: prefer temprary address if use_tempaddr >= 2
1043                  */
1044                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1045                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1046                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1047                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1048                 break;
1049             }
1050 #endif
1051         case IPV6_SADDR_RULE_ORCHID:
1052                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1053                  *          non-ORCHID vs non-ORCHID
1054                  */
1055                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1056                         ipv6_addr_orchid(dst->addr));
1057                 break;
1058         case IPV6_SADDR_RULE_PREFIX:
1059                 /* Rule 8: Use longest matching prefix */
1060                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1061                                                        dst->addr);
1062                 break;
1063         default:
1064                 ret = 0;
1065         }
1066
1067         if (ret)
1068                 __set_bit(i, score->scorebits);
1069         score->rule = i;
1070 out:
1071         return ret;
1072 }
1073
1074 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1075                        const struct in6_addr *daddr, unsigned int prefs,
1076                        struct in6_addr *saddr)
1077 {
1078         struct ipv6_saddr_score scores[2],
1079                                 *score = &scores[0], *hiscore = &scores[1];
1080         struct net *net = dev_net(dst_dev);
1081         struct ipv6_saddr_dst dst;
1082         struct net_device *dev;
1083         int dst_type;
1084
1085         dst_type = __ipv6_addr_type(daddr);
1086         dst.addr = daddr;
1087         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1088         dst.scope = __ipv6_addr_src_scope(dst_type);
1089         dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1090         dst.prefs = prefs;
1091
1092         hiscore->rule = -1;
1093         hiscore->ifa = NULL;
1094
1095         read_lock(&dev_base_lock);
1096         rcu_read_lock();
1097
1098         for_each_netdev(net, dev) {
1099                 struct inet6_dev *idev;
1100
1101                 /* Candidate Source Address (section 4)
1102                  *  - multicast and link-local destination address,
1103                  *    the set of candidate source address MUST only
1104                  *    include addresses assigned to interfaces
1105                  *    belonging to the same link as the outgoing
1106                  *    interface.
1107                  * (- For site-local destination addresses, the
1108                  *    set of candidate source addresses MUST only
1109                  *    include addresses assigned to interfaces
1110                  *    belonging to the same site as the outgoing
1111                  *    interface.)
1112                  */
1113                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1114                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1115                     dst.ifindex && dev->ifindex != dst.ifindex)
1116                         continue;
1117
1118                 idev = __in6_dev_get(dev);
1119                 if (!idev)
1120                         continue;
1121
1122                 read_lock_bh(&idev->lock);
1123                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1124                         int i;
1125
1126                         /*
1127                          * - Tentative Address (RFC2462 section 5.4)
1128                          *  - A tentative address is not considered
1129                          *    "assigned to an interface" in the traditional
1130                          *    sense, unless it is also flagged as optimistic.
1131                          * - Candidate Source Address (section 4)
1132                          *  - In any case, anycast addresses, multicast
1133                          *    addresses, and the unspecified address MUST
1134                          *    NOT be included in a candidate set.
1135                          */
1136                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1137                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1138                                 continue;
1139
1140                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1141
1142                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1143                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1144                                 LIMIT_NETDEBUG(KERN_DEBUG
1145                                                "ADDRCONF: unspecified / multicast address "
1146                                                "assigned as unicast address on %s",
1147                                                dev->name);
1148                                 continue;
1149                         }
1150
1151                         score->rule = -1;
1152                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1153
1154                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1155                                 int minihiscore, miniscore;
1156
1157                                 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1158                                 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1159
1160                                 if (minihiscore > miniscore) {
1161                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1162                                             score->scopedist > 0) {
1163                                                 /*
1164                                                  * special case:
1165                                                  * each remaining entry
1166                                                  * has too small (not enough)
1167                                                  * scope, because ifa entries
1168                                                  * are sorted by their scope
1169                                                  * values.
1170                                                  */
1171                                                 goto try_nextdev;
1172                                         }
1173                                         break;
1174                                 } else if (minihiscore < miniscore) {
1175                                         struct ipv6_saddr_score *tmp;
1176
1177                                         if (hiscore->ifa)
1178                                                 in6_ifa_put(hiscore->ifa);
1179
1180                                         in6_ifa_hold(score->ifa);
1181
1182                                         tmp = hiscore;
1183                                         hiscore = score;
1184                                         score = tmp;
1185
1186                                         /* restore our iterator */
1187                                         score->ifa = hiscore->ifa;
1188
1189                                         break;
1190                                 }
1191                         }
1192                 }
1193 try_nextdev:
1194                 read_unlock_bh(&idev->lock);
1195         }
1196         rcu_read_unlock();
1197         read_unlock(&dev_base_lock);
1198
1199         if (!hiscore->ifa)
1200                 return -EADDRNOTAVAIL;
1201
1202         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1203         in6_ifa_put(hiscore->ifa);
1204         return 0;
1205 }
1206
1207 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1208
1209 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1210                     unsigned char banned_flags)
1211 {
1212         struct inet6_dev *idev;
1213         int err = -EADDRNOTAVAIL;
1214
1215         rcu_read_lock();
1216         if ((idev = __in6_dev_get(dev)) != NULL) {
1217                 struct inet6_ifaddr *ifp;
1218
1219                 read_lock_bh(&idev->lock);
1220                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1221                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1222                                 ipv6_addr_copy(addr, &ifp->addr);
1223                                 err = 0;
1224                                 break;
1225                         }
1226                 }
1227                 read_unlock_bh(&idev->lock);
1228         }
1229         rcu_read_unlock();
1230         return err;
1231 }
1232
1233 static int ipv6_count_addresses(struct inet6_dev *idev)
1234 {
1235         int cnt = 0;
1236         struct inet6_ifaddr *ifp;
1237
1238         read_lock_bh(&idev->lock);
1239         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1240                 cnt++;
1241         read_unlock_bh(&idev->lock);
1242         return cnt;
1243 }
1244
1245 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1246                   struct net_device *dev, int strict)
1247 {
1248         struct inet6_ifaddr * ifp;
1249         u8 hash = ipv6_addr_hash(addr);
1250
1251         read_lock_bh(&addrconf_hash_lock);
1252         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1253                 if (!net_eq(dev_net(ifp->idev->dev), net))
1254                         continue;
1255                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1256                     !(ifp->flags&IFA_F_TENTATIVE)) {
1257                         if (dev == NULL || ifp->idev->dev == dev ||
1258                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1259                                 break;
1260                 }
1261         }
1262         read_unlock_bh(&addrconf_hash_lock);
1263         return ifp != NULL;
1264 }
1265 EXPORT_SYMBOL(ipv6_chk_addr);
1266
1267 static
1268 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1269                        struct net_device *dev)
1270 {
1271         struct inet6_ifaddr * ifp;
1272         u8 hash = ipv6_addr_hash(addr);
1273
1274         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1275                 if (!net_eq(dev_net(ifp->idev->dev), net))
1276                         continue;
1277                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1278                         if (dev == NULL || ifp->idev->dev == dev)
1279                                 break;
1280                 }
1281         }
1282         return ifp != NULL;
1283 }
1284
1285 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1286 {
1287         struct inet6_dev *idev;
1288         struct inet6_ifaddr *ifa;
1289         int     onlink;
1290
1291         onlink = 0;
1292         rcu_read_lock();
1293         idev = __in6_dev_get(dev);
1294         if (idev) {
1295                 read_lock_bh(&idev->lock);
1296                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1297                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1298                                                    ifa->prefix_len);
1299                         if (onlink)
1300                                 break;
1301                 }
1302                 read_unlock_bh(&idev->lock);
1303         }
1304         rcu_read_unlock();
1305         return onlink;
1306 }
1307
1308 EXPORT_SYMBOL(ipv6_chk_prefix);
1309
1310 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1311                                      struct net_device *dev, int strict)
1312 {
1313         struct inet6_ifaddr * ifp;
1314         u8 hash = ipv6_addr_hash(addr);
1315
1316         read_lock_bh(&addrconf_hash_lock);
1317         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1318                 if (!net_eq(dev_net(ifp->idev->dev), net))
1319                         continue;
1320                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1321                         if (dev == NULL || ifp->idev->dev == dev ||
1322                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1323                                 in6_ifa_hold(ifp);
1324                                 break;
1325                         }
1326                 }
1327         }
1328         read_unlock_bh(&addrconf_hash_lock);
1329
1330         return ifp;
1331 }
1332
1333 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1334 {
1335         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1336         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1337         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1338         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1339         int sk_ipv6only = ipv6_only_sock(sk);
1340         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1341         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1342         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1343
1344         if (!sk2_rcv_saddr && !sk_ipv6only)
1345                 return 1;
1346
1347         if (addr_type2 == IPV6_ADDR_ANY &&
1348             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1349                 return 1;
1350
1351         if (addr_type == IPV6_ADDR_ANY &&
1352             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1353                 return 1;
1354
1355         if (sk2_rcv_saddr6 &&
1356             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1357                 return 1;
1358
1359         if (addr_type == IPV6_ADDR_MAPPED &&
1360             !sk2_ipv6only &&
1361             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1362                 return 1;
1363
1364         return 0;
1365 }
1366
1367 /* Gets referenced address, destroys ifaddr */
1368
1369 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1370 {
1371         if (ifp->flags&IFA_F_PERMANENT) {
1372                 spin_lock_bh(&ifp->lock);
1373                 addrconf_del_timer(ifp);
1374                 ifp->flags |= IFA_F_TENTATIVE;
1375                 spin_unlock_bh(&ifp->lock);
1376                 in6_ifa_put(ifp);
1377 #ifdef CONFIG_IPV6_PRIVACY
1378         } else if (ifp->flags&IFA_F_TEMPORARY) {
1379                 struct inet6_ifaddr *ifpub;
1380                 spin_lock_bh(&ifp->lock);
1381                 ifpub = ifp->ifpub;
1382                 if (ifpub) {
1383                         in6_ifa_hold(ifpub);
1384                         spin_unlock_bh(&ifp->lock);
1385                         ipv6_create_tempaddr(ifpub, ifp);
1386                         in6_ifa_put(ifpub);
1387                 } else {
1388                         spin_unlock_bh(&ifp->lock);
1389                 }
1390                 ipv6_del_addr(ifp);
1391 #endif
1392         } else
1393                 ipv6_del_addr(ifp);
1394 }
1395
1396 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1397 {
1398         if (net_ratelimit())
1399                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1400         addrconf_dad_stop(ifp);
1401 }
1402
1403 /* Join to solicited addr multicast group. */
1404
1405 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1406 {
1407         struct in6_addr maddr;
1408
1409         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1410                 return;
1411
1412         addrconf_addr_solict_mult(addr, &maddr);
1413         ipv6_dev_mc_inc(dev, &maddr);
1414 }
1415
1416 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1417 {
1418         struct in6_addr maddr;
1419
1420         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1421                 return;
1422
1423         addrconf_addr_solict_mult(addr, &maddr);
1424         __ipv6_dev_mc_dec(idev, &maddr);
1425 }
1426
1427 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1428 {
1429         struct in6_addr addr;
1430         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1431         if (ipv6_addr_any(&addr))
1432                 return;
1433         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1434 }
1435
1436 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1437 {
1438         struct in6_addr addr;
1439         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1440         if (ipv6_addr_any(&addr))
1441                 return;
1442         __ipv6_dev_ac_dec(ifp->idev, &addr);
1443 }
1444
1445 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1446 {
1447         if (dev->addr_len != ETH_ALEN)
1448                 return -1;
1449         memcpy(eui, dev->dev_addr, 3);
1450         memcpy(eui + 5, dev->dev_addr + 3, 3);
1451
1452         /*
1453          * The zSeries OSA network cards can be shared among various
1454          * OS instances, but the OSA cards have only one MAC address.
1455          * This leads to duplicate address conflicts in conjunction
1456          * with IPv6 if more than one instance uses the same card.
1457          *
1458          * The driver for these cards can deliver a unique 16-bit
1459          * identifier for each instance sharing the same card.  It is
1460          * placed instead of 0xFFFE in the interface identifier.  The
1461          * "u" bit of the interface identifier is not inverted in this
1462          * case.  Hence the resulting interface identifier has local
1463          * scope according to RFC2373.
1464          */
1465         if (dev->dev_id) {
1466                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1467                 eui[4] = dev->dev_id & 0xFF;
1468         } else {
1469                 eui[3] = 0xFF;
1470                 eui[4] = 0xFE;
1471                 eui[0] ^= 2;
1472         }
1473         return 0;
1474 }
1475
1476 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1477 {
1478         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1479         if (dev->addr_len != ARCNET_ALEN)
1480                 return -1;
1481         memset(eui, 0, 7);
1482         eui[7] = *(u8*)dev->dev_addr;
1483         return 0;
1484 }
1485
1486 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1487 {
1488         if (dev->addr_len != INFINIBAND_ALEN)
1489                 return -1;
1490         memcpy(eui, dev->dev_addr + 12, 8);
1491         eui[0] |= 2;
1492         return 0;
1493 }
1494
1495 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1496 {
1497         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1498                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1499                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1500                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1501                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1502                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1503         eui[1] = 0;
1504         eui[2] = 0x5E;
1505         eui[3] = 0xFE;
1506         memcpy(eui + 4, &addr, 4);
1507         return 0;
1508 }
1509 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1510
1511 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1512 {
1513         if (dev->priv_flags & IFF_ISATAP)
1514                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1515         return -1;
1516 }
1517
1518 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1519 {
1520         switch (dev->type) {
1521         case ARPHRD_ETHER:
1522         case ARPHRD_FDDI:
1523         case ARPHRD_IEEE802_TR:
1524                 return addrconf_ifid_eui48(eui, dev);
1525         case ARPHRD_ARCNET:
1526                 return addrconf_ifid_arcnet(eui, dev);
1527         case ARPHRD_INFINIBAND:
1528                 return addrconf_ifid_infiniband(eui, dev);
1529         case ARPHRD_SIT:
1530                 return addrconf_ifid_sit(eui, dev);
1531         }
1532         return -1;
1533 }
1534
1535 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1536 {
1537         int err = -1;
1538         struct inet6_ifaddr *ifp;
1539
1540         read_lock_bh(&idev->lock);
1541         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1542                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1543                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1544                         err = 0;
1545                         break;
1546                 }
1547         }
1548         read_unlock_bh(&idev->lock);
1549         return err;
1550 }
1551
1552 #ifdef CONFIG_IPV6_PRIVACY
1553 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1554 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1555 {
1556 regen:
1557         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1558         idev->rndid[0] &= ~0x02;
1559
1560         /*
1561          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1562          * check if generated address is not inappropriate
1563          *
1564          *  - Reserved subnet anycast (RFC 2526)
1565          *      11111101 11....11 1xxxxxxx
1566          *  - ISATAP (RFC4214) 6.1
1567          *      00-00-5E-FE-xx-xx-xx-xx
1568          *  - value 0
1569          *  - XXX: already assigned to an address on the device
1570          */
1571         if (idev->rndid[0] == 0xfd &&
1572             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1573             (idev->rndid[7]&0x80))
1574                 goto regen;
1575         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1576                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1577                         goto regen;
1578                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1579                         goto regen;
1580         }
1581
1582         return 0;
1583 }
1584
1585 static void ipv6_regen_rndid(unsigned long data)
1586 {
1587         struct inet6_dev *idev = (struct inet6_dev *) data;
1588         unsigned long expires;
1589
1590         rcu_read_lock_bh();
1591         write_lock_bh(&idev->lock);
1592
1593         if (idev->dead)
1594                 goto out;
1595
1596         if (__ipv6_regen_rndid(idev) < 0)
1597                 goto out;
1598
1599         expires = jiffies +
1600                 idev->cnf.temp_prefered_lft * HZ -
1601                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1602         if (time_before(expires, jiffies)) {
1603                 printk(KERN_WARNING
1604                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1605                         idev->dev->name);
1606                 goto out;
1607         }
1608
1609         if (!mod_timer(&idev->regen_timer, expires))
1610                 in6_dev_hold(idev);
1611
1612 out:
1613         write_unlock_bh(&idev->lock);
1614         rcu_read_unlock_bh();
1615         in6_dev_put(idev);
1616 }
1617
1618 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1619         int ret = 0;
1620
1621         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1622                 ret = __ipv6_regen_rndid(idev);
1623         return ret;
1624 }
1625 #endif
1626
1627 /*
1628  *      Add prefix route.
1629  */
1630
1631 static void
1632 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1633                       unsigned long expires, u32 flags)
1634 {
1635         struct fib6_config cfg = {
1636                 .fc_table = RT6_TABLE_PREFIX,
1637                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1638                 .fc_ifindex = dev->ifindex,
1639                 .fc_expires = expires,
1640                 .fc_dst_len = plen,
1641                 .fc_flags = RTF_UP | flags,
1642                 .fc_nlinfo.nl_net = dev_net(dev),
1643         };
1644
1645         ipv6_addr_copy(&cfg.fc_dst, pfx);
1646
1647         /* Prevent useless cloning on PtP SIT.
1648            This thing is done here expecting that the whole
1649            class of non-broadcast devices need not cloning.
1650          */
1651 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1652         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1653                 cfg.fc_flags |= RTF_NONEXTHOP;
1654 #endif
1655
1656         ip6_route_add(&cfg);
1657 }
1658
1659 /* Create "default" multicast route to the interface */
1660
1661 static void addrconf_add_mroute(struct net_device *dev)
1662 {
1663         struct fib6_config cfg = {
1664                 .fc_table = RT6_TABLE_LOCAL,
1665                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1666                 .fc_ifindex = dev->ifindex,
1667                 .fc_dst_len = 8,
1668                 .fc_flags = RTF_UP,
1669                 .fc_nlinfo.nl_net = dev_net(dev),
1670         };
1671
1672         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1673
1674         ip6_route_add(&cfg);
1675 }
1676
1677 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1678 static void sit_route_add(struct net_device *dev)
1679 {
1680         struct fib6_config cfg = {
1681                 .fc_table = RT6_TABLE_MAIN,
1682                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1683                 .fc_ifindex = dev->ifindex,
1684                 .fc_dst_len = 96,
1685                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1686                 .fc_nlinfo.nl_net = dev_net(dev),
1687         };
1688
1689         /* prefix length - 96 bits "::d.d.d.d" */
1690         ip6_route_add(&cfg);
1691 }
1692 #endif
1693
1694 static void addrconf_add_lroute(struct net_device *dev)
1695 {
1696         struct in6_addr addr;
1697
1698         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1699         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1700 }
1701
1702 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1703 {
1704         struct inet6_dev *idev;
1705
1706         ASSERT_RTNL();
1707
1708         if ((idev = ipv6_find_idev(dev)) == NULL)
1709                 return NULL;
1710
1711         /* Add default multicast route */
1712         addrconf_add_mroute(dev);
1713
1714         /* Add link local route */
1715         addrconf_add_lroute(dev);
1716         return idev;
1717 }
1718
1719 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1720 {
1721         struct prefix_info *pinfo;
1722         __u32 valid_lft;
1723         __u32 prefered_lft;
1724         int addr_type;
1725         unsigned long rt_expires;
1726         struct inet6_dev *in6_dev;
1727
1728         pinfo = (struct prefix_info *) opt;
1729
1730         if (len < sizeof(struct prefix_info)) {
1731                 ADBG(("addrconf: prefix option too short\n"));
1732                 return;
1733         }
1734
1735         /*
1736          *      Validation checks ([ADDRCONF], page 19)
1737          */
1738
1739         addr_type = ipv6_addr_type(&pinfo->prefix);
1740
1741         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1742                 return;
1743
1744         valid_lft = ntohl(pinfo->valid);
1745         prefered_lft = ntohl(pinfo->prefered);
1746
1747         if (prefered_lft > valid_lft) {
1748                 if (net_ratelimit())
1749                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1750                 return;
1751         }
1752
1753         in6_dev = in6_dev_get(dev);
1754
1755         if (in6_dev == NULL) {
1756                 if (net_ratelimit())
1757                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1758                 return;
1759         }
1760
1761         /*
1762          *      Two things going on here:
1763          *      1) Add routes for on-link prefixes
1764          *      2) Configure prefixes with the auto flag set
1765          */
1766
1767         if (valid_lft == INFINITY_LIFE_TIME)
1768                 rt_expires = ~0UL;
1769         else if (valid_lft >= 0x7FFFFFFF/HZ) {
1770                 /* Avoid arithmetic overflow. Really, we could
1771                  * save rt_expires in seconds, likely valid_lft,
1772                  * but it would require division in fib gc, that it
1773                  * not good.
1774                  */
1775                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1776         } else
1777                 rt_expires = valid_lft * HZ;
1778
1779         /*
1780          * We convert this (in jiffies) to clock_t later.
1781          * Avoid arithmetic overflow there as well.
1782          * Overflow can happen only if HZ < USER_HZ.
1783          */
1784         if (HZ < USER_HZ && ~rt_expires && rt_expires > 0x7FFFFFFF / USER_HZ)
1785                 rt_expires = 0x7FFFFFFF / USER_HZ;
1786
1787         if (pinfo->onlink) {
1788                 struct rt6_info *rt;
1789                 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1790                                 dev->ifindex, 1);
1791
1792                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1793                         /* Autoconf prefix route */
1794                         if (valid_lft == 0) {
1795                                 ip6_del_rt(rt);
1796                                 rt = NULL;
1797                         } else if (~rt_expires) {
1798                                 /* not infinity */
1799                                 rt->rt6i_expires = jiffies + rt_expires;
1800                                 rt->rt6i_flags |= RTF_EXPIRES;
1801                         } else {
1802                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1803                                 rt->rt6i_expires = 0;
1804                         }
1805                 } else if (valid_lft) {
1806                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1807                         clock_t expires = 0;
1808                         if (~rt_expires) {
1809                                 /* not infinity */
1810                                 flags |= RTF_EXPIRES;
1811                                 expires = jiffies_to_clock_t(rt_expires);
1812                         }
1813                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1814                                               dev, expires, flags);
1815                 }
1816                 if (rt)
1817                         dst_release(&rt->u.dst);
1818         }
1819
1820         /* Try to figure out our local address for this prefix */
1821
1822         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1823                 struct inet6_ifaddr * ifp;
1824                 struct in6_addr addr;
1825                 int create = 0, update_lft = 0;
1826
1827                 if (pinfo->prefix_len == 64) {
1828                         memcpy(&addr, &pinfo->prefix, 8);
1829                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1830                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1831                                 in6_dev_put(in6_dev);
1832                                 return;
1833                         }
1834                         goto ok;
1835                 }
1836                 if (net_ratelimit())
1837                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1838                                pinfo->prefix_len);
1839                 in6_dev_put(in6_dev);
1840                 return;
1841
1842 ok:
1843
1844                 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1845
1846                 if (ifp == NULL && valid_lft) {
1847                         int max_addresses = in6_dev->cnf.max_addresses;
1848                         u32 addr_flags = 0;
1849
1850 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1851                         if (in6_dev->cnf.optimistic_dad &&
1852                             !ipv6_devconf.forwarding)
1853                                 addr_flags = IFA_F_OPTIMISTIC;
1854 #endif
1855
1856                         /* Do not allow to create too much of autoconfigured
1857                          * addresses; this would be too easy way to crash kernel.
1858                          */
1859                         if (!max_addresses ||
1860                             ipv6_count_addresses(in6_dev) < max_addresses)
1861                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1862                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1863                                                     addr_flags);
1864
1865                         if (!ifp || IS_ERR(ifp)) {
1866                                 in6_dev_put(in6_dev);
1867                                 return;
1868                         }
1869
1870                         update_lft = create = 1;
1871                         ifp->cstamp = jiffies;
1872                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1873                 }
1874
1875                 if (ifp) {
1876                         int flags;
1877                         unsigned long now;
1878 #ifdef CONFIG_IPV6_PRIVACY
1879                         struct inet6_ifaddr *ift;
1880 #endif
1881                         u32 stored_lft;
1882
1883                         /* update lifetime (RFC2462 5.5.3 e) */
1884                         spin_lock(&ifp->lock);
1885                         now = jiffies;
1886                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1887                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1888                         else
1889                                 stored_lft = 0;
1890                         if (!update_lft && stored_lft) {
1891                                 if (valid_lft > MIN_VALID_LIFETIME ||
1892                                     valid_lft > stored_lft)
1893                                         update_lft = 1;
1894                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1895                                         /* valid_lft <= stored_lft is always true */
1896                                         /* XXX: IPsec */
1897                                         update_lft = 0;
1898                                 } else {
1899                                         valid_lft = MIN_VALID_LIFETIME;
1900                                         if (valid_lft < prefered_lft)
1901                                                 prefered_lft = valid_lft;
1902                                         update_lft = 1;
1903                                 }
1904                         }
1905
1906                         if (update_lft) {
1907                                 ifp->valid_lft = valid_lft;
1908                                 ifp->prefered_lft = prefered_lft;
1909                                 ifp->tstamp = now;
1910                                 flags = ifp->flags;
1911                                 ifp->flags &= ~IFA_F_DEPRECATED;
1912                                 spin_unlock(&ifp->lock);
1913
1914                                 if (!(flags&IFA_F_TENTATIVE))
1915                                         ipv6_ifa_notify(0, ifp);
1916                         } else
1917                                 spin_unlock(&ifp->lock);
1918
1919 #ifdef CONFIG_IPV6_PRIVACY
1920                         read_lock_bh(&in6_dev->lock);
1921                         /* update all temporary addresses in the list */
1922                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1923                                 /*
1924                                  * When adjusting the lifetimes of an existing
1925                                  * temporary address, only lower the lifetimes.
1926                                  * Implementations must not increase the
1927                                  * lifetimes of an existing temporary address
1928                                  * when processing a Prefix Information Option.
1929                                  */
1930                                 if (ifp != ift->ifpub)
1931                                         continue;
1932
1933                                 spin_lock(&ift->lock);
1934                                 flags = ift->flags;
1935                                 if (ift->valid_lft > valid_lft &&
1936                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1937                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1938                                 if (ift->prefered_lft > prefered_lft &&
1939                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1940                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1941                                 spin_unlock(&ift->lock);
1942                                 if (!(flags&IFA_F_TENTATIVE))
1943                                         ipv6_ifa_notify(0, ift);
1944                         }
1945
1946                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1947                                 /*
1948                                  * When a new public address is created as described in [ADDRCONF],
1949                                  * also create a new temporary address.
1950                                  */
1951                                 read_unlock_bh(&in6_dev->lock);
1952                                 ipv6_create_tempaddr(ifp, NULL);
1953                         } else {
1954                                 read_unlock_bh(&in6_dev->lock);
1955                         }
1956 #endif
1957                         in6_ifa_put(ifp);
1958                         addrconf_verify(0);
1959                 }
1960         }
1961         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1962         in6_dev_put(in6_dev);
1963 }
1964
1965 /*
1966  *      Set destination address.
1967  *      Special case for SIT interfaces where we create a new "virtual"
1968  *      device.
1969  */
1970 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1971 {
1972         struct in6_ifreq ireq;
1973         struct net_device *dev;
1974         int err = -EINVAL;
1975
1976         rtnl_lock();
1977
1978         err = -EFAULT;
1979         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1980                 goto err_exit;
1981
1982         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1983
1984         err = -ENODEV;
1985         if (dev == NULL)
1986                 goto err_exit;
1987
1988 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1989         if (dev->type == ARPHRD_SIT) {
1990                 struct ifreq ifr;
1991                 mm_segment_t    oldfs;
1992                 struct ip_tunnel_parm p;
1993
1994                 err = -EADDRNOTAVAIL;
1995                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1996                         goto err_exit;
1997
1998                 memset(&p, 0, sizeof(p));
1999                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2000                 p.iph.saddr = 0;
2001                 p.iph.version = 4;
2002                 p.iph.ihl = 5;
2003                 p.iph.protocol = IPPROTO_IPV6;
2004                 p.iph.ttl = 64;
2005                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2006
2007                 oldfs = get_fs(); set_fs(KERNEL_DS);
2008                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2009                 set_fs(oldfs);
2010
2011                 if (err == 0) {
2012                         err = -ENOBUFS;
2013                         dev = __dev_get_by_name(net, p.name);
2014                         if (!dev)
2015                                 goto err_exit;
2016                         err = dev_open(dev);
2017                 }
2018         }
2019 #endif
2020
2021 err_exit:
2022         rtnl_unlock();
2023         return err;
2024 }
2025
2026 /*
2027  *      Manual configuration of address on an interface
2028  */
2029 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2030                           int plen, __u8 ifa_flags, __u32 prefered_lft,
2031                           __u32 valid_lft)
2032 {
2033         struct inet6_ifaddr *ifp;
2034         struct inet6_dev *idev;
2035         struct net_device *dev;
2036         int scope;
2037         u32 flags;
2038         clock_t expires;
2039
2040         ASSERT_RTNL();
2041
2042         /* check the lifetime */
2043         if (!valid_lft || prefered_lft > valid_lft)
2044                 return -EINVAL;
2045
2046         dev = __dev_get_by_index(net, ifindex);
2047         if (!dev)
2048                 return -ENODEV;
2049
2050         if ((idev = addrconf_add_dev(dev)) == NULL)
2051                 return -ENOBUFS;
2052
2053         scope = ipv6_addr_scope(pfx);
2054
2055         if (valid_lft == INFINITY_LIFE_TIME) {
2056                 ifa_flags |= IFA_F_PERMANENT;
2057                 flags = 0;
2058                 expires = 0;
2059         } else {
2060                 if (valid_lft >= 0x7FFFFFFF/HZ)
2061                         valid_lft = 0x7FFFFFFF/HZ;
2062                 flags = RTF_EXPIRES;
2063                 expires = jiffies_to_clock_t(valid_lft * HZ);
2064         }
2065
2066         if (prefered_lft == 0)
2067                 ifa_flags |= IFA_F_DEPRECATED;
2068         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2069                  (prefered_lft != INFINITY_LIFE_TIME))
2070                 prefered_lft = 0x7FFFFFFF/HZ;
2071
2072         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2073
2074         if (!IS_ERR(ifp)) {
2075                 spin_lock_bh(&ifp->lock);
2076                 ifp->valid_lft = valid_lft;
2077                 ifp->prefered_lft = prefered_lft;
2078                 ifp->tstamp = jiffies;
2079                 spin_unlock_bh(&ifp->lock);
2080
2081                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2082                                       expires, flags);
2083                 /*
2084                  * Note that section 3.1 of RFC 4429 indicates
2085                  * that the Optimistic flag should not be set for
2086                  * manually configured addresses
2087                  */
2088                 addrconf_dad_start(ifp, 0);
2089                 in6_ifa_put(ifp);
2090                 addrconf_verify(0);
2091                 return 0;
2092         }
2093
2094         return PTR_ERR(ifp);
2095 }
2096
2097 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2098                           int plen)
2099 {
2100         struct inet6_ifaddr *ifp;
2101         struct inet6_dev *idev;
2102         struct net_device *dev;
2103
2104         dev = __dev_get_by_index(net, ifindex);
2105         if (!dev)
2106                 return -ENODEV;
2107
2108         if ((idev = __in6_dev_get(dev)) == NULL)
2109                 return -ENXIO;
2110
2111         read_lock_bh(&idev->lock);
2112         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2113                 if (ifp->prefix_len == plen &&
2114                     ipv6_addr_equal(pfx, &ifp->addr)) {
2115                         in6_ifa_hold(ifp);
2116                         read_unlock_bh(&idev->lock);
2117
2118                         ipv6_del_addr(ifp);
2119
2120                         /* If the last address is deleted administratively,
2121                            disable IPv6 on this interface.
2122                          */
2123                         if (idev->addr_list == NULL)
2124                                 addrconf_ifdown(idev->dev, 1);
2125                         return 0;
2126                 }
2127         }
2128         read_unlock_bh(&idev->lock);
2129         return -EADDRNOTAVAIL;
2130 }
2131
2132
2133 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2134 {
2135         struct in6_ifreq ireq;
2136         int err;
2137
2138         if (!capable(CAP_NET_ADMIN))
2139                 return -EPERM;
2140
2141         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2142                 return -EFAULT;
2143
2144         rtnl_lock();
2145         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2146                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2147                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2148         rtnl_unlock();
2149         return err;
2150 }
2151
2152 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2153 {
2154         struct in6_ifreq ireq;
2155         int err;
2156
2157         if (!capable(CAP_NET_ADMIN))
2158                 return -EPERM;
2159
2160         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2161                 return -EFAULT;
2162
2163         rtnl_lock();
2164         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2165                              ireq.ifr6_prefixlen);
2166         rtnl_unlock();
2167         return err;
2168 }
2169
2170 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2171 static void sit_add_v4_addrs(struct inet6_dev *idev)
2172 {
2173         struct inet6_ifaddr * ifp;
2174         struct in6_addr addr;
2175         struct net_device *dev;
2176         struct net *net = dev_net(idev->dev);
2177         int scope;
2178
2179         ASSERT_RTNL();
2180
2181         memset(&addr, 0, sizeof(struct in6_addr));
2182         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2183
2184         if (idev->dev->flags&IFF_POINTOPOINT) {
2185                 addr.s6_addr32[0] = htonl(0xfe800000);
2186                 scope = IFA_LINK;
2187         } else {
2188                 scope = IPV6_ADDR_COMPATv4;
2189         }
2190
2191         if (addr.s6_addr32[3]) {
2192                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2193                 if (!IS_ERR(ifp)) {
2194                         spin_lock_bh(&ifp->lock);
2195                         ifp->flags &= ~IFA_F_TENTATIVE;
2196                         spin_unlock_bh(&ifp->lock);
2197                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2198                         in6_ifa_put(ifp);
2199                 }
2200                 return;
2201         }
2202
2203         for_each_netdev(net, dev) {
2204                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2205                 if (in_dev && (dev->flags & IFF_UP)) {
2206                         struct in_ifaddr * ifa;
2207
2208                         int flag = scope;
2209
2210                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2211                                 int plen;
2212
2213                                 addr.s6_addr32[3] = ifa->ifa_local;
2214
2215                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2216                                         continue;
2217                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2218                                         if (idev->dev->flags&IFF_POINTOPOINT)
2219                                                 continue;
2220                                         flag |= IFA_HOST;
2221                                 }
2222                                 if (idev->dev->flags&IFF_POINTOPOINT)
2223                                         plen = 64;
2224                                 else
2225                                         plen = 96;
2226
2227                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2228                                                     IFA_F_PERMANENT);
2229                                 if (!IS_ERR(ifp)) {
2230                                         spin_lock_bh(&ifp->lock);
2231                                         ifp->flags &= ~IFA_F_TENTATIVE;
2232                                         spin_unlock_bh(&ifp->lock);
2233                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2234                                         in6_ifa_put(ifp);
2235                                 }
2236                         }
2237                 }
2238         }
2239 }
2240 #endif
2241
2242 static void init_loopback(struct net_device *dev)
2243 {
2244         struct inet6_dev  *idev;
2245         struct inet6_ifaddr * ifp;
2246
2247         /* ::1 */
2248
2249         ASSERT_RTNL();
2250
2251         if ((idev = ipv6_find_idev(dev)) == NULL) {
2252                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2253                 return;
2254         }
2255
2256         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2257         if (!IS_ERR(ifp)) {
2258                 spin_lock_bh(&ifp->lock);
2259                 ifp->flags &= ~IFA_F_TENTATIVE;
2260                 spin_unlock_bh(&ifp->lock);
2261                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2262                 in6_ifa_put(ifp);
2263         }
2264 }
2265
2266 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2267 {
2268         struct inet6_ifaddr * ifp;
2269         u32 addr_flags = IFA_F_PERMANENT;
2270
2271 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2272         if (idev->cnf.optimistic_dad &&
2273             !ipv6_devconf.forwarding)
2274                 addr_flags |= IFA_F_OPTIMISTIC;
2275 #endif
2276
2277
2278         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2279         if (!IS_ERR(ifp)) {
2280                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2281                 addrconf_dad_start(ifp, 0);
2282                 in6_ifa_put(ifp);
2283         }
2284 }
2285
2286 static void addrconf_dev_config(struct net_device *dev)
2287 {
2288         struct in6_addr addr;
2289         struct inet6_dev    * idev;
2290
2291         ASSERT_RTNL();
2292
2293         if ((dev->type != ARPHRD_ETHER) &&
2294             (dev->type != ARPHRD_FDDI) &&
2295             (dev->type != ARPHRD_IEEE802_TR) &&
2296             (dev->type != ARPHRD_ARCNET) &&
2297             (dev->type != ARPHRD_INFINIBAND)) {
2298                 /* Alas, we support only Ethernet autoconfiguration. */
2299                 return;
2300         }
2301
2302         idev = addrconf_add_dev(dev);
2303         if (idev == NULL)
2304                 return;
2305
2306         memset(&addr, 0, sizeof(struct in6_addr));
2307         addr.s6_addr32[0] = htonl(0xFE800000);
2308
2309         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2310                 addrconf_add_linklocal(idev, &addr);
2311 }
2312
2313 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2314 static void addrconf_sit_config(struct net_device *dev)
2315 {
2316         struct inet6_dev *idev;
2317
2318         ASSERT_RTNL();
2319
2320         /*
2321          * Configure the tunnel with one of our IPv4
2322          * addresses... we should configure all of
2323          * our v4 addrs in the tunnel
2324          */
2325
2326         if ((idev = ipv6_find_idev(dev)) == NULL) {
2327                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2328                 return;
2329         }
2330
2331         if (dev->priv_flags & IFF_ISATAP) {
2332                 struct in6_addr addr;
2333
2334                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2335                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2336                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2337                         addrconf_add_linklocal(idev, &addr);
2338                 return;
2339         }
2340
2341         sit_add_v4_addrs(idev);
2342
2343         if (dev->flags&IFF_POINTOPOINT) {
2344                 addrconf_add_mroute(dev);
2345                 addrconf_add_lroute(dev);
2346         } else
2347                 sit_route_add(dev);
2348 }
2349 #endif
2350
2351 static inline int
2352 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2353 {
2354         struct in6_addr lladdr;
2355
2356         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2357                 addrconf_add_linklocal(idev, &lladdr);
2358                 return 0;
2359         }
2360         return -1;
2361 }
2362
2363 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2364 {
2365         struct net_device *link_dev;
2366         struct net *net = dev_net(idev->dev);
2367
2368         /* first try to inherit the link-local address from the link device */
2369         if (idev->dev->iflink &&
2370             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2371                 if (!ipv6_inherit_linklocal(idev, link_dev))
2372                         return;
2373         }
2374         /* then try to inherit it from any device */
2375         for_each_netdev(net, link_dev) {
2376                 if (!ipv6_inherit_linklocal(idev, link_dev))
2377                         return;
2378         }
2379         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2380 }
2381
2382 /*
2383  * Autoconfigure tunnel with a link-local address so routing protocols,
2384  * DHCPv6, MLD etc. can be run over the virtual link
2385  */
2386
2387 static void addrconf_ip6_tnl_config(struct net_device *dev)
2388 {
2389         struct inet6_dev *idev;
2390
2391         ASSERT_RTNL();
2392
2393         if ((idev = addrconf_add_dev(dev)) == NULL) {
2394                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2395                 return;
2396         }
2397         ip6_tnl_add_linklocal(idev);
2398 }
2399
2400 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2401                            void * data)
2402 {
2403         struct net_device *dev = (struct net_device *) data;
2404         struct inet6_dev *idev = __in6_dev_get(dev);
2405         int run_pending = 0;
2406         int err;
2407
2408         switch(event) {
2409         case NETDEV_REGISTER:
2410                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2411                         idev = ipv6_add_dev(dev);
2412                         if (!idev)
2413                                 return notifier_from_errno(-ENOMEM);
2414                 }
2415                 break;
2416         case NETDEV_UP:
2417         case NETDEV_CHANGE:
2418                 if (dev->flags & IFF_SLAVE)
2419                         break;
2420
2421                 if (event == NETDEV_UP) {
2422                         if (!addrconf_qdisc_ok(dev)) {
2423                                 /* device is not ready yet. */
2424                                 printk(KERN_INFO
2425                                         "ADDRCONF(NETDEV_UP): %s: "
2426                                         "link is not ready\n",
2427                                         dev->name);
2428                                 break;
2429                         }
2430
2431                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2432                                 idev = ipv6_add_dev(dev);
2433
2434                         if (idev)
2435                                 idev->if_flags |= IF_READY;
2436                 } else {
2437                         if (!addrconf_qdisc_ok(dev)) {
2438                                 /* device is still not ready. */
2439                                 break;
2440                         }
2441
2442                         if (idev) {
2443                                 if (idev->if_flags & IF_READY) {
2444                                         /* device is already configured. */
2445                                         break;
2446                                 }
2447                                 idev->if_flags |= IF_READY;
2448                         }
2449
2450                         printk(KERN_INFO
2451                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2452                                         "link becomes ready\n",
2453                                         dev->name);
2454
2455                         run_pending = 1;
2456                 }
2457
2458                 switch(dev->type) {
2459 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2460                 case ARPHRD_SIT:
2461                         addrconf_sit_config(dev);
2462                         break;
2463 #endif
2464                 case ARPHRD_TUNNEL6:
2465                         addrconf_ip6_tnl_config(dev);
2466                         break;
2467                 case ARPHRD_LOOPBACK:
2468                         init_loopback(dev);
2469                         break;
2470
2471                 default:
2472                         addrconf_dev_config(dev);
2473                         break;
2474                 }
2475                 if (idev) {
2476                         if (run_pending)
2477                                 addrconf_dad_run(idev);
2478
2479                         /* If the MTU changed during the interface down, when the
2480                            interface up, the changed MTU must be reflected in the
2481                            idev as well as routers.
2482                          */
2483                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2484                                 rt6_mtu_change(dev, dev->mtu);
2485                                 idev->cnf.mtu6 = dev->mtu;
2486                         }
2487                         idev->tstamp = jiffies;
2488                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2489                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2490                            stop IPv6 on this interface.
2491                          */
2492                         if (dev->mtu < IPV6_MIN_MTU)
2493                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2494                 }
2495                 break;
2496
2497         case NETDEV_CHANGEMTU:
2498                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2499                         rt6_mtu_change(dev, dev->mtu);
2500                         idev->cnf.mtu6 = dev->mtu;
2501                         break;
2502                 }
2503
2504                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2505                         idev = ipv6_add_dev(dev);
2506                         if (idev)
2507                                 break;
2508                 }
2509
2510                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2511
2512         case NETDEV_DOWN:
2513         case NETDEV_UNREGISTER:
2514                 /*
2515                  *      Remove all addresses from this interface.
2516                  */
2517                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2518                 break;
2519
2520         case NETDEV_CHANGENAME:
2521                 if (idev) {
2522                         snmp6_unregister_dev(idev);
2523                         addrconf_sysctl_unregister(idev);
2524                         addrconf_sysctl_register(idev);
2525                         err = snmp6_register_dev(idev);
2526                         if (err)
2527                                 return notifier_from_errno(err);
2528                 }
2529                 break;
2530         }
2531
2532         return NOTIFY_OK;
2533 }
2534
2535 /*
2536  *      addrconf module should be notified of a device going up
2537  */
2538 static struct notifier_block ipv6_dev_notf = {
2539         .notifier_call = addrconf_notify,
2540         .priority = 0
2541 };
2542
2543 static int addrconf_ifdown(struct net_device *dev, int how)
2544 {
2545         struct inet6_dev *idev;
2546         struct inet6_ifaddr *ifa, **bifa;
2547         struct net *net = dev_net(dev);
2548         int i;
2549
2550         ASSERT_RTNL();
2551
2552         if ((dev->flags & IFF_LOOPBACK) && how == 1)
2553                 how = 0;
2554
2555         rt6_ifdown(net, dev);
2556         neigh_ifdown(&nd_tbl, dev);
2557
2558         idev = __in6_dev_get(dev);
2559         if (idev == NULL)
2560                 return -ENODEV;
2561
2562         /* Step 1: remove reference to ipv6 device from parent device.
2563                    Do not dev_put!
2564          */
2565         if (how) {
2566                 idev->dead = 1;
2567
2568                 /* protected by rtnl_lock */
2569                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2570
2571                 /* Step 1.5: remove snmp6 entry */
2572                 snmp6_unregister_dev(idev);
2573
2574         }
2575
2576         /* Step 2: clear hash table */
2577         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2578                 bifa = &inet6_addr_lst[i];
2579
2580                 write_lock_bh(&addrconf_hash_lock);
2581                 while ((ifa = *bifa) != NULL) {
2582                         if (ifa->idev == idev) {
2583                                 *bifa = ifa->lst_next;
2584                                 ifa->lst_next = NULL;
2585                                 addrconf_del_timer(ifa);
2586                                 in6_ifa_put(ifa);
2587                                 continue;
2588                         }
2589                         bifa = &ifa->lst_next;
2590                 }
2591                 write_unlock_bh(&addrconf_hash_lock);
2592         }
2593
2594         write_lock_bh(&idev->lock);
2595
2596         /* Step 3: clear flags for stateless addrconf */
2597         if (!how)
2598                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2599
2600         /* Step 4: clear address list */
2601 #ifdef CONFIG_IPV6_PRIVACY
2602         if (how && del_timer(&idev->regen_timer))
2603                 in6_dev_put(idev);
2604
2605         /* clear tempaddr list */
2606         while ((ifa = idev->tempaddr_list) != NULL) {
2607                 idev->tempaddr_list = ifa->tmp_next;
2608                 ifa->tmp_next = NULL;
2609                 ifa->dead = 1;
2610                 write_unlock_bh(&idev->lock);
2611                 spin_lock_bh(&ifa->lock);
2612
2613                 if (ifa->ifpub) {
2614                         in6_ifa_put(ifa->ifpub);
2615                         ifa->ifpub = NULL;
2616                 }
2617                 spin_unlock_bh(&ifa->lock);
2618                 in6_ifa_put(ifa);
2619                 write_lock_bh(&idev->lock);
2620         }
2621 #endif
2622         while ((ifa = idev->addr_list) != NULL) {
2623                 idev->addr_list = ifa->if_next;
2624                 ifa->if_next = NULL;
2625                 ifa->dead = 1;
2626                 addrconf_del_timer(ifa);
2627                 write_unlock_bh(&idev->lock);
2628
2629                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2630                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2631                 in6_ifa_put(ifa);
2632
2633                 write_lock_bh(&idev->lock);
2634         }
2635         write_unlock_bh(&idev->lock);
2636
2637         /* Step 5: Discard multicast list */
2638
2639         if (how)
2640                 ipv6_mc_destroy_dev(idev);
2641         else
2642                 ipv6_mc_down(idev);
2643
2644         idev->tstamp = jiffies;
2645
2646         /* Shot the device (if unregistered) */
2647
2648         if (how) {
2649                 addrconf_sysctl_unregister(idev);
2650                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2651                 neigh_ifdown(&nd_tbl, dev);
2652                 in6_dev_put(idev);
2653         }
2654         return 0;
2655 }
2656
2657 static void addrconf_rs_timer(unsigned long data)
2658 {
2659         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2660
2661         if (ifp->idev->cnf.forwarding)
2662                 goto out;
2663
2664         if (ifp->idev->if_flags & IF_RA_RCVD) {
2665                 /*
2666                  *      Announcement received after solicitation
2667                  *      was sent
2668                  */
2669                 goto out;
2670         }
2671
2672         spin_lock(&ifp->lock);
2673         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2674                 /* The wait after the last probe can be shorter */
2675                 addrconf_mod_timer(ifp, AC_RS,
2676                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2677                                    ifp->idev->cnf.rtr_solicit_delay :
2678                                    ifp->idev->cnf.rtr_solicit_interval);
2679                 spin_unlock(&ifp->lock);
2680
2681                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2682         } else {
2683                 spin_unlock(&ifp->lock);
2684                 /*
2685                  * Note: we do not support deprecated "all on-link"
2686                  * assumption any longer.
2687                  */
2688                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2689                        ifp->idev->dev->name);
2690         }
2691
2692 out:
2693         in6_ifa_put(ifp);
2694 }
2695
2696 /*
2697  *      Duplicate Address Detection
2698  */
2699 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2700 {
2701         unsigned long rand_num;
2702         struct inet6_dev *idev = ifp->idev;
2703
2704         if (ifp->flags & IFA_F_OPTIMISTIC)
2705                 rand_num = 0;
2706         else
2707                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2708
2709         ifp->probes = idev->cnf.dad_transmits;
2710         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2711 }
2712
2713 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2714 {
2715         struct inet6_dev *idev = ifp->idev;
2716         struct net_device *dev = idev->dev;
2717
2718         addrconf_join_solict(dev, &ifp->addr);
2719
2720         net_srandom(ifp->addr.s6_addr32[3]);
2721
2722         read_lock_bh(&idev->lock);
2723         if (ifp->dead)
2724                 goto out;
2725         spin_lock_bh(&ifp->lock);
2726
2727         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2728             !(ifp->flags&IFA_F_TENTATIVE) ||
2729             ifp->flags & IFA_F_NODAD) {
2730                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2731                 spin_unlock_bh(&ifp->lock);
2732                 read_unlock_bh(&idev->lock);
2733
2734                 addrconf_dad_completed(ifp);
2735                 return;
2736         }
2737
2738         if (!(idev->if_flags & IF_READY)) {
2739                 spin_unlock_bh(&ifp->lock);
2740                 read_unlock_bh(&idev->lock);
2741                 /*
2742                  * If the defice is not ready:
2743                  * - keep it tentative if it is a permanent address.
2744                  * - otherwise, kill it.
2745                  */
2746                 in6_ifa_hold(ifp);
2747                 addrconf_dad_stop(ifp);
2748                 return;
2749         }
2750
2751         /*
2752          * Optimistic nodes can start receiving
2753          * Frames right away
2754          */
2755         if(ifp->flags & IFA_F_OPTIMISTIC)
2756                 ip6_ins_rt(ifp->rt);
2757
2758         addrconf_dad_kick(ifp);
2759         spin_unlock_bh(&ifp->lock);
2760 out:
2761         read_unlock_bh(&idev->lock);
2762 }
2763
2764 static void addrconf_dad_timer(unsigned long data)
2765 {
2766         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2767         struct inet6_dev *idev = ifp->idev;
2768         struct in6_addr mcaddr;
2769
2770         read_lock_bh(&idev->lock);
2771         if (idev->dead) {
2772                 read_unlock_bh(&idev->lock);
2773                 goto out;
2774         }
2775         spin_lock_bh(&ifp->lock);
2776         if (ifp->probes == 0) {
2777                 /*
2778                  * DAD was successful
2779                  */
2780
2781                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2782                 spin_unlock_bh(&ifp->lock);
2783                 read_unlock_bh(&idev->lock);
2784
2785                 addrconf_dad_completed(ifp);
2786
2787                 goto out;
2788         }
2789
2790         ifp->probes--;
2791         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2792         spin_unlock_bh(&ifp->lock);
2793         read_unlock_bh(&idev->lock);
2794
2795         /* send a neighbour solicitation for our addr */
2796         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2797         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2798 out:
2799         in6_ifa_put(ifp);
2800 }
2801
2802 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2803 {
2804         struct net_device *     dev = ifp->idev->dev;
2805
2806         /*
2807          *      Configure the address for reception. Now it is valid.
2808          */
2809
2810         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2811
2812         /* If added prefix is link local and forwarding is off,
2813            start sending router solicitations.
2814          */
2815
2816         if (ifp->idev->cnf.forwarding == 0 &&
2817             ifp->idev->cnf.rtr_solicits > 0 &&
2818             (dev->flags&IFF_LOOPBACK) == 0 &&
2819             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2820                 /*
2821                  *      If a host as already performed a random delay
2822                  *      [...] as part of DAD [...] there is no need
2823                  *      to delay again before sending the first RS
2824                  */
2825                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2826
2827                 spin_lock_bh(&ifp->lock);
2828                 ifp->probes = 1;
2829                 ifp->idev->if_flags |= IF_RS_SENT;
2830                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2831                 spin_unlock_bh(&ifp->lock);
2832         }
2833 }
2834
2835 static void addrconf_dad_run(struct inet6_dev *idev) {
2836         struct inet6_ifaddr *ifp;
2837
2838         read_lock_bh(&idev->lock);
2839         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2840                 spin_lock_bh(&ifp->lock);
2841                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2842                         spin_unlock_bh(&ifp->lock);
2843                         continue;
2844                 }
2845                 spin_unlock_bh(&ifp->lock);
2846                 addrconf_dad_kick(ifp);
2847         }
2848         read_unlock_bh(&idev->lock);
2849 }
2850
2851 #ifdef CONFIG_PROC_FS
2852 struct if6_iter_state {
2853         struct seq_net_private p;
2854         int bucket;
2855 };
2856
2857 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2858 {
2859         struct inet6_ifaddr *ifa = NULL;
2860         struct if6_iter_state *state = seq->private;
2861         struct net *net = seq_file_net(seq);
2862
2863         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2864                 ifa = inet6_addr_lst[state->bucket];
2865
2866                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2867                         ifa = ifa->lst_next;
2868                 if (ifa)
2869                         break;
2870         }
2871         return ifa;
2872 }
2873
2874 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2875 {
2876         struct if6_iter_state *state = seq->private;
2877         struct net *net = seq_file_net(seq);
2878
2879         ifa = ifa->lst_next;
2880 try_again:
2881         if (ifa) {
2882                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2883                         ifa = ifa->lst_next;
2884                         goto try_again;
2885                 }
2886         }
2887
2888         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2889                 ifa = inet6_addr_lst[state->bucket];
2890                 goto try_again;
2891         }
2892
2893         return ifa;
2894 }
2895
2896 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2897 {
2898         struct inet6_ifaddr *ifa = if6_get_first(seq);
2899
2900         if (ifa)
2901                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2902                         --pos;
2903         return pos ? NULL : ifa;
2904 }
2905
2906 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2907         __acquires(addrconf_hash_lock)
2908 {
2909         read_lock_bh(&addrconf_hash_lock);
2910         return if6_get_idx(seq, *pos);
2911 }
2912
2913 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2914 {
2915         struct inet6_ifaddr *ifa;
2916
2917         ifa = if6_get_next(seq, v);
2918         ++*pos;
2919         return ifa;
2920 }
2921
2922 static void if6_seq_stop(struct seq_file *seq, void *v)
2923         __releases(addrconf_hash_lock)
2924 {
2925         read_unlock_bh(&addrconf_hash_lock);
2926 }
2927
2928 static int if6_seq_show(struct seq_file *seq, void *v)
2929 {
2930         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2931         seq_printf(seq,
2932                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2933                    NIP6(ifp->addr),
2934                    ifp->idev->dev->ifindex,
2935                    ifp->prefix_len,
2936                    ifp->scope,
2937                    ifp->flags,
2938                    ifp->idev->dev->name);
2939         return 0;
2940 }
2941
2942 static const struct seq_operations if6_seq_ops = {
2943         .start  = if6_seq_start,
2944         .next   = if6_seq_next,
2945         .show   = if6_seq_show,
2946         .stop   = if6_seq_stop,
2947 };
2948
2949 static int if6_seq_open(struct inode *inode, struct file *file)
2950 {
2951         return seq_open_net(inode, file, &if6_seq_ops,
2952                             sizeof(struct if6_iter_state));
2953 }
2954
2955 static const struct file_operations if6_fops = {
2956         .owner          = THIS_MODULE,
2957         .open           = if6_seq_open,
2958         .read           = seq_read,
2959         .llseek         = seq_lseek,
2960         .release        = seq_release_net,
2961 };
2962
2963 static int if6_proc_net_init(struct net *net)
2964 {
2965         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2966                 return -ENOMEM;
2967         return 0;
2968 }
2969
2970 static void if6_proc_net_exit(struct net *net)
2971 {
2972        proc_net_remove(net, "if_inet6");
2973 }
2974
2975 static struct pernet_operations if6_proc_net_ops = {
2976        .init = if6_proc_net_init,
2977        .exit = if6_proc_net_exit,
2978 };
2979
2980 int __init if6_proc_init(void)
2981 {
2982         return register_pernet_subsys(&if6_proc_net_ops);
2983 }
2984
2985 void if6_proc_exit(void)
2986 {
2987         unregister_pernet_subsys(&if6_proc_net_ops);
2988 }
2989 #endif  /* CONFIG_PROC_FS */
2990
2991 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2992 /* Check if address is a home address configured on any interface. */
2993 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2994 {
2995         int ret = 0;
2996         struct inet6_ifaddr * ifp;
2997         u8 hash = ipv6_addr_hash(addr);
2998         read_lock_bh(&addrconf_hash_lock);
2999         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3000                 if (!net_eq(dev_net(ifp->idev->dev), net))
3001                         continue;
3002                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3003                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3004                         ret = 1;
3005                         break;
3006                 }
3007         }
3008         read_unlock_bh(&addrconf_hash_lock);
3009         return ret;
3010 }
3011 #endif
3012
3013 /*
3014  *      Periodic address status verification
3015  */
3016
3017 static void addrconf_verify(unsigned long foo)
3018 {
3019         struct inet6_ifaddr *ifp;
3020         unsigned long now, next;
3021         int i;
3022
3023         spin_lock_bh(&addrconf_verify_lock);
3024         now = jiffies;
3025         next = now + ADDR_CHECK_FREQUENCY;
3026
3027         del_timer(&addr_chk_timer);
3028
3029         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3030
3031 restart:
3032                 read_lock(&addrconf_hash_lock);
3033                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3034                         unsigned long age;
3035 #ifdef CONFIG_IPV6_PRIVACY
3036                         unsigned long regen_advance;
3037 #endif
3038
3039                         if (ifp->flags & IFA_F_PERMANENT)
3040                                 continue;
3041
3042                         spin_lock(&ifp->lock);
3043                         age = (now - ifp->tstamp) / HZ;
3044
3045 #ifdef CONFIG_IPV6_PRIVACY
3046                         regen_advance = ifp->idev->cnf.regen_max_retry *
3047                                         ifp->idev->cnf.dad_transmits *
3048                                         ifp->idev->nd_parms->retrans_time / HZ;
3049 #endif
3050
3051                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3052                             age >= ifp->valid_lft) {
3053                                 spin_unlock(&ifp->lock);
3054                                 in6_ifa_hold(ifp);
3055                                 read_unlock(&addrconf_hash_lock);
3056                                 ipv6_del_addr(ifp);
3057                                 goto restart;
3058                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3059                                 spin_unlock(&ifp->lock);
3060                                 continue;
3061                         } else if (age >= ifp->prefered_lft) {
3062                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3063                                 int deprecate = 0;
3064
3065                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3066                                         deprecate = 1;
3067                                         ifp->flags |= IFA_F_DEPRECATED;
3068                                 }
3069
3070                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3071                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3072
3073                                 spin_unlock(&ifp->lock);
3074
3075                                 if (deprecate) {
3076                                         in6_ifa_hold(ifp);
3077                                         read_unlock(&addrconf_hash_lock);
3078
3079                                         ipv6_ifa_notify(0, ifp);
3080                                         in6_ifa_put(ifp);
3081                                         goto restart;
3082                                 }
3083 #ifdef CONFIG_IPV6_PRIVACY
3084                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3085                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3086                                 if (age >= ifp->prefered_lft - regen_advance) {
3087                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3088                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3089                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3090                                         if (!ifp->regen_count && ifpub) {
3091                                                 ifp->regen_count++;
3092                                                 in6_ifa_hold(ifp);
3093                                                 in6_ifa_hold(ifpub);
3094                                                 spin_unlock(&ifp->lock);
3095                                                 read_unlock(&addrconf_hash_lock);
3096                                                 spin_lock(&ifpub->lock);
3097                                                 ifpub->regen_count = 0;
3098                                                 spin_unlock(&ifpub->lock);
3099                                                 ipv6_create_tempaddr(ifpub, ifp);
3100                                                 in6_ifa_put(ifpub);
3101                                                 in6_ifa_put(ifp);
3102                                                 goto restart;
3103                                         }
3104                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3105                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3106                                 spin_unlock(&ifp->lock);
3107 #endif
3108                         } else {
3109                                 /* ifp->prefered_lft <= ifp->valid_lft */
3110                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3111                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3112                                 spin_unlock(&ifp->lock);
3113                         }
3114                 }
3115                 read_unlock(&addrconf_hash_lock);
3116         }
3117
3118         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3119         add_timer(&addr_chk_timer);
3120         spin_unlock_bh(&addrconf_verify_lock);
3121 }
3122
3123 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3124 {
3125         struct in6_addr *pfx = NULL;
3126
3127         if (addr)
3128                 pfx = nla_data(addr);
3129
3130         if (local) {
3131                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3132                         pfx = NULL;
3133                 else
3134                         pfx = nla_data(local);
3135         }
3136
3137         return pfx;
3138 }
3139
3140 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3141         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3142         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3143         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3144 };
3145
3146 static int
3147 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3148 {
3149         struct net *net = sock_net(skb->sk);
3150         struct ifaddrmsg *ifm;
3151         struct nlattr *tb[IFA_MAX+1];
3152         struct in6_addr *pfx;
3153         int err;
3154
3155         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3156         if (err < 0)
3157                 return err;
3158
3159         ifm = nlmsg_data(nlh);
3160         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3161         if (pfx == NULL)
3162                 return -EINVAL;
3163
3164         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3165 }
3166
3167 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3168                              u32 prefered_lft, u32 valid_lft)
3169 {
3170         u32 flags;
3171         clock_t expires;
3172
3173         if (!valid_lft || (prefered_lft > valid_lft))
3174                 return -EINVAL;
3175
3176         if (valid_lft == INFINITY_LIFE_TIME) {
3177                 ifa_flags |= IFA_F_PERMANENT;
3178                 flags = 0;
3179                 expires = 0;
3180         } else {
3181                 if (valid_lft >= 0x7FFFFFFF/HZ)
3182                         valid_lft = 0x7FFFFFFF/HZ;
3183                 flags = RTF_EXPIRES;
3184                 expires = jiffies_to_clock_t(valid_lft * HZ);
3185         }
3186
3187         if (prefered_lft == 0)
3188                 ifa_flags |= IFA_F_DEPRECATED;
3189         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3190                  (prefered_lft != INFINITY_LIFE_TIME))
3191                 prefered_lft = 0x7FFFFFFF/HZ;
3192
3193         spin_lock_bh(&ifp->lock);
3194         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3195         ifp->tstamp = jiffies;
3196         ifp->valid_lft = valid_lft;
3197         ifp->prefered_lft = prefered_lft;
3198
3199         spin_unlock_bh(&ifp->lock);
3200         if (!(ifp->flags&IFA_F_TENTATIVE))
3201                 ipv6_ifa_notify(0, ifp);
3202
3203         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3204                               expires, flags);
3205         addrconf_verify(0);
3206
3207         return 0;
3208 }
3209
3210 static int
3211 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3212 {
3213         struct net *net = sock_net(skb->sk);
3214         struct ifaddrmsg *ifm;
3215         struct nlattr *tb[IFA_MAX+1];
3216         struct in6_addr *pfx;
3217         struct inet6_ifaddr *ifa;
3218         struct net_device *dev;
3219         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3220         u8 ifa_flags;
3221         int err;
3222
3223         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3224         if (err < 0)
3225                 return err;
3226
3227         ifm = nlmsg_data(nlh);
3228         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3229         if (pfx == NULL)
3230                 return -EINVAL;
3231
3232         if (tb[IFA_CACHEINFO]) {
3233                 struct ifa_cacheinfo *ci;
3234
3235                 ci = nla_data(tb[IFA_CACHEINFO]);
3236                 valid_lft = ci->ifa_valid;
3237                 preferred_lft = ci->ifa_prefered;
3238         } else {
3239                 preferred_lft = INFINITY_LIFE_TIME;
3240                 valid_lft = INFINITY_LIFE_TIME;
3241         }
3242
3243         dev =  __dev_get_by_index(net, ifm->ifa_index);
3244         if (dev == NULL)
3245                 return -ENODEV;
3246
3247         /* We ignore other flags so far. */
3248         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3249
3250         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3251         if (ifa == NULL) {
3252                 /*
3253                  * It would be best to check for !NLM_F_CREATE here but
3254                  * userspace alreay relies on not having to provide this.
3255                  */
3256                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3257                                       ifm->ifa_prefixlen, ifa_flags,
3258                                       preferred_lft, valid_lft);
3259         }
3260
3261         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3262             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3263                 err = -EEXIST;
3264         else
3265                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3266
3267         in6_ifa_put(ifa);
3268
3269         return err;
3270 }
3271
3272 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3273                           u8 scope, int ifindex)
3274 {
3275         struct ifaddrmsg *ifm;
3276
3277         ifm = nlmsg_data(nlh);
3278         ifm->ifa_family = AF_INET6;
3279         ifm->ifa_prefixlen = prefixlen;
3280         ifm->ifa_flags = flags;
3281         ifm->ifa_scope = scope;
3282         ifm->ifa_index = ifindex;
3283 }
3284
3285 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3286                          unsigned long tstamp, u32 preferred, u32 valid)
3287 {
3288         struct ifa_cacheinfo ci;
3289
3290         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3291                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3292         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3293                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3294         ci.ifa_prefered = preferred;
3295         ci.ifa_valid = valid;
3296
3297         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3298 }
3299
3300 static inline int rt_scope(int ifa_scope)
3301 {
3302         if (ifa_scope & IFA_HOST)
3303                 return RT_SCOPE_HOST;
3304         else if (ifa_scope & IFA_LINK)
3305                 return RT_SCOPE_LINK;
3306         else if (ifa_scope & IFA_SITE)
3307                 return RT_SCOPE_SITE;
3308         else
3309                 return RT_SCOPE_UNIVERSE;
3310 }
3311
3312 static inline int inet6_ifaddr_msgsize(void)
3313 {
3314         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3315                + nla_total_size(16) /* IFA_ADDRESS */
3316                + nla_total_size(sizeof(struct ifa_cacheinfo));
3317 }
3318
3319 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3320                              u32 pid, u32 seq, int event, unsigned int flags)
3321 {
3322         struct nlmsghdr  *nlh;
3323         u32 preferred, valid;
3324
3325         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3326         if (nlh == NULL)
3327                 return -EMSGSIZE;
3328
3329         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3330                       ifa->idev->dev->ifindex);
3331
3332         if (!(ifa->flags&IFA_F_PERMANENT)) {
3333                 preferred = ifa->prefered_lft;
3334                 valid = ifa->valid_lft;
3335                 if (preferred != INFINITY_LIFE_TIME) {
3336                         long tval = (jiffies - ifa->tstamp)/HZ;
3337                         preferred -= tval;
3338                         if (valid != INFINITY_LIFE_TIME)
3339                                 valid -= tval;
3340                 }
3341         } else {
3342                 preferred = INFINITY_LIFE_TIME;
3343                 valid = INFINITY_LIFE_TIME;
3344         }
3345
3346         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3347             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3348                 nlmsg_cancel(skb, nlh);
3349                 return -EMSGSIZE;
3350         }
3351
3352         return nlmsg_end(skb, nlh);
3353 }
3354
3355 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3356                                 u32 pid, u32 seq, int event, u16 flags)
3357 {
3358         struct nlmsghdr  *nlh;
3359         u8 scope = RT_SCOPE_UNIVERSE;
3360         int ifindex = ifmca->idev->dev->ifindex;
3361
3362         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3363                 scope = RT_SCOPE_SITE;
3364
3365         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3366         if (nlh == NULL)
3367                 return -EMSGSIZE;
3368
3369         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3370         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3371             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3372                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3373                 nlmsg_cancel(skb, nlh);
3374                 return -EMSGSIZE;
3375         }
3376
3377         return nlmsg_end(skb, nlh);
3378 }
3379
3380 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3381                                 u32 pid, u32 seq, int event, unsigned int flags)
3382 {
3383         struct nlmsghdr  *nlh;
3384         u8 scope = RT_SCOPE_UNIVERSE;
3385         int ifindex = ifaca->aca_idev->dev->ifindex;
3386
3387         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3388                 scope = RT_SCOPE_SITE;
3389
3390         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3391         if (nlh == NULL)
3392                 return -EMSGSIZE;
3393
3394         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3395         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3396             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3397                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3398                 nlmsg_cancel(skb, nlh);
3399                 return -EMSGSIZE;
3400         }
3401
3402         return nlmsg_end(skb, nlh);
3403 }
3404
3405 enum addr_type_t
3406 {
3407         UNICAST_ADDR,
3408         MULTICAST_ADDR,
3409         ANYCAST_ADDR,
3410 };
3411
3412 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3413                            enum addr_type_t type)
3414 {
3415         int idx, ip_idx;
3416         int s_idx, s_ip_idx;
3417         int err = 1;
3418         struct net_device *dev;
3419         struct inet6_dev *idev = NULL;
3420         struct inet6_ifaddr *ifa;
3421         struct ifmcaddr6 *ifmca;
3422         struct ifacaddr6 *ifaca;
3423         struct net *net = sock_net(skb->sk);
3424
3425         s_idx = cb->args[0];
3426         s_ip_idx = ip_idx = cb->args[1];
3427
3428         idx = 0;
3429         for_each_netdev(net, dev) {
3430                 if (idx < s_idx)
3431                         goto cont;
3432                 if (idx > s_idx)
3433                         s_ip_idx = 0;
3434                 ip_idx = 0;
3435                 if ((idev = in6_dev_get(dev)) == NULL)
3436                         goto cont;
3437                 read_lock_bh(&idev->lock);
3438                 switch (type) {
3439                 case UNICAST_ADDR:
3440                         /* unicast address incl. temp addr */
3441                         for (ifa = idev->addr_list; ifa;
3442                              ifa = ifa->if_next, ip_idx++) {
3443                                 if (ip_idx < s_ip_idx)
3444                                         continue;
3445                                 err = inet6_fill_ifaddr(skb, ifa,
3446                                                         NETLINK_CB(cb->skb).pid,
3447                                                         cb->nlh->nlmsg_seq,
3448                                                         RTM_NEWADDR,
3449                                                         NLM_F_MULTI);
3450                         }
3451                         break;
3452                 case MULTICAST_ADDR:
3453                         /* multicast address */
3454                         for (ifmca = idev->mc_list; ifmca;
3455                              ifmca = ifmca->next, ip_idx++) {
3456                                 if (ip_idx < s_ip_idx)
3457                                         continue;
3458                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3459                                                           NETLINK_CB(cb->skb).pid,
3460                                                           cb->nlh->nlmsg_seq,
3461                                                           RTM_GETMULTICAST,
3462                                                           NLM_F_MULTI);
3463                         }
3464                         break;
3465                 case ANYCAST_ADDR:
3466                         /* anycast address */
3467                         for (ifaca = idev->ac_list; ifaca;
3468                              ifaca = ifaca->aca_next, ip_idx++) {
3469                                 if (ip_idx < s_ip_idx)
3470                                         continue;
3471                                 err = inet6_fill_ifacaddr(skb, ifaca,
3472                                                           NETLINK_CB(cb->skb).pid,
3473                                                           cb->nlh->nlmsg_seq,
3474                                                           RTM_GETANYCAST,
3475                                                           NLM_F_MULTI);
3476                         }
3477                         break;
3478                 default:
3479                         break;
3480                 }
3481                 read_unlock_bh(&idev->lock);
3482                 in6_dev_put(idev);
3483
3484                 if (err <= 0)
3485                         break;
3486 cont:
3487                 idx++;
3488         }
3489         cb->args[0] = idx;
3490         cb->args[1] = ip_idx;
3491         return skb->len;
3492 }
3493
3494 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3495 {
3496         enum addr_type_t type = UNICAST_ADDR;
3497
3498         return inet6_dump_addr(skb, cb, type);
3499 }
3500
3501 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3502 {
3503         enum addr_type_t type = MULTICAST_ADDR;
3504
3505         return inet6_dump_addr(skb, cb, type);
3506 }
3507
3508
3509 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3510 {
3511         enum addr_type_t type = ANYCAST_ADDR;
3512
3513         return inet6_dump_addr(skb, cb, type);
3514 }
3515
3516 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3517                              void *arg)
3518 {
3519         struct net *net = sock_net(in_skb->sk);
3520         struct ifaddrmsg *ifm;
3521         struct nlattr *tb[IFA_MAX+1];
3522         struct in6_addr *addr = NULL;
3523         struct net_device *dev = NULL;
3524         struct inet6_ifaddr *ifa;
3525         struct sk_buff *skb;
3526         int err;
3527
3528         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3529         if (err < 0)
3530                 goto errout;
3531
3532         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3533         if (addr == NULL) {
3534                 err = -EINVAL;
3535                 goto errout;
3536         }
3537
3538         ifm = nlmsg_data(nlh);
3539         if (ifm->ifa_index)
3540                 dev = __dev_get_by_index(net, ifm->ifa_index);
3541
3542         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3543                 err = -EADDRNOTAVAIL;
3544                 goto errout;
3545         }
3546
3547         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3548                 err = -ENOBUFS;
3549                 goto errout_ifa;
3550         }
3551
3552         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3553                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3554         if (err < 0) {
3555                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3556                 WARN_ON(err == -EMSGSIZE);
3557                 kfree_skb(skb);
3558                 goto errout_ifa;
3559         }
3560         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3561 errout_ifa:
3562         in6_ifa_put(ifa);
3563 errout:
3564         return err;
3565 }
3566
3567 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3568 {
3569         struct sk_buff *skb;
3570         struct net *net = dev_net(ifa->idev->dev);
3571         int err = -ENOBUFS;
3572
3573         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3574         if (skb == NULL)
3575                 goto errout;
3576
3577         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3578         if (err < 0) {
3579                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3580                 WARN_ON(err == -EMSGSIZE);
3581                 kfree_skb(skb);
3582                 goto errout;
3583         }
3584         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3585 errout:
3586         if (err < 0)
3587                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3588 }
3589
3590 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3591                                 __s32 *array, int bytes)
3592 {
3593         BUG_ON(bytes < (DEVCONF_MAX * 4));
3594
3595         memset(array, 0, bytes);
3596         array[DEVCONF_FORWARDING] = cnf->forwarding;
3597         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3598         array[DEVCONF_MTU6] = cnf->mtu6;
3599         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3600         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3601         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3602         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3603         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3604         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3605         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3606         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3607 #ifdef CONFIG_IPV6_PRIVACY
3608         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3609         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3610         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3611         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3612         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3613 #endif
3614         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3615         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3616         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3617 #ifdef CONFIG_IPV6_ROUTER_PREF
3618         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3619         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3620 #ifdef CONFIG_IPV6_ROUTE_INFO
3621         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3622 #endif
3623 #endif
3624         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3625         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3626 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3627         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3628 #endif
3629 #ifdef CONFIG_IPV6_MROUTE
3630         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3631 #endif
3632 }
3633
3634 static inline size_t inet6_if_nlmsg_size(void)
3635 {
3636         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3637                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3638                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3639                + nla_total_size(4) /* IFLA_MTU */
3640                + nla_total_size(4) /* IFLA_LINK */
3641                + nla_total_size( /* IFLA_PROTINFO */
3642                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3643                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3644                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3645                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3646                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3647                  );
3648 }
3649
3650 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3651                                       int bytes)
3652 {
3653         int i;
3654         int pad = bytes - sizeof(u64) * items;
3655         BUG_ON(pad < 0);
3656
3657         /* Use put_unaligned() because stats may not be aligned for u64. */
3658         put_unaligned(items, &stats[0]);
3659         for (i = 1; i < items; i++)
3660                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3661
3662         memset(&stats[items], 0, pad);
3663 }
3664
3665 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3666                              int bytes)
3667 {
3668         switch(attrtype) {
3669         case IFLA_INET6_STATS:
3670                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3671                 break;
3672         case IFLA_INET6_ICMP6STATS:
3673                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3674                 break;
3675         }
3676 }
3677
3678 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3679                              u32 pid, u32 seq, int event, unsigned int flags)
3680 {
3681         struct net_device *dev = idev->dev;
3682         struct nlattr *nla;
3683         struct ifinfomsg *hdr;
3684         struct nlmsghdr *nlh;
3685         void *protoinfo;
3686         struct ifla_cacheinfo ci;
3687
3688         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3689         if (nlh == NULL)
3690                 return -EMSGSIZE;
3691
3692         hdr = nlmsg_data(nlh);
3693         hdr->ifi_family = AF_INET6;
3694         hdr->__ifi_pad = 0;
3695         hdr->ifi_type = dev->type;
3696         hdr->ifi_index = dev->ifindex;
3697         hdr->ifi_flags = dev_get_flags(dev);
3698         hdr->ifi_change = 0;
3699
3700         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3701
3702         if (dev->addr_len)
3703                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3704
3705         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3706         if (dev->ifindex != dev->iflink)
3707                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3708
3709         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3710         if (protoinfo == NULL)
3711                 goto nla_put_failure;
3712
3713         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3714
3715         ci.max_reasm_len = IPV6_MAXPLEN;
3716         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3717                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3718         ci.reachable_time = idev->nd_parms->reachable_time;
3719         ci.retrans_time = idev->nd_parms->retrans_time;
3720         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3721
3722         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3723         if (nla == NULL)
3724                 goto nla_put_failure;
3725         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3726
3727         /* XXX - MC not implemented */
3728
3729         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3730         if (nla == NULL)
3731                 goto nla_put_failure;
3732         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3733
3734         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3735         if (nla == NULL)
3736                 goto nla_put_failure;
3737         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3738
3739         nla_nest_end(skb, protoinfo);
3740         return nlmsg_end(skb, nlh);
3741
3742 nla_put_failure:
3743         nlmsg_cancel(skb, nlh);
3744         return -EMSGSIZE;
3745 }
3746
3747 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3748 {
3749         struct net *net = sock_net(skb->sk);
3750         int idx, err;
3751         int s_idx = cb->args[0];
3752         struct net_device *dev;
3753         struct inet6_dev *idev;
3754
3755         read_lock(&dev_base_lock);
3756         idx = 0;
3757         for_each_netdev(net, dev) {
3758                 if (idx < s_idx)
3759                         goto cont;
3760                 if ((idev = in6_dev_get(dev)) == NULL)
3761                         goto cont;
3762                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3763                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3764                 in6_dev_put(idev);
3765                 if (err <= 0)
3766                         break;
3767 cont:
3768                 idx++;
3769         }
3770         read_unlock(&dev_base_lock);
3771         cb->args[0] = idx;
3772
3773         return skb->len;
3774 }
3775
3776 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3777 {
3778         struct sk_buff *skb;
3779         struct net *net = dev_net(idev->dev);
3780         int err = -ENOBUFS;
3781
3782         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3783         if (skb == NULL)
3784                 goto errout;
3785
3786         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3787         if (err < 0) {
3788                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3789                 WARN_ON(err == -EMSGSIZE);
3790                 kfree_skb(skb);
3791                 goto errout;
3792         }
3793         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3794 errout:
3795         if (err < 0)
3796                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3797 }
3798
3799 static inline size_t inet6_prefix_nlmsg_size(void)
3800 {
3801         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3802                + nla_total_size(sizeof(struct in6_addr))
3803                + nla_total_size(sizeof(struct prefix_cacheinfo));
3804 }
3805
3806 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3807                              struct prefix_info *pinfo, u32 pid, u32 seq,
3808                              int event, unsigned int flags)
3809 {
3810         struct prefixmsg *pmsg;
3811         struct nlmsghdr *nlh;
3812         struct prefix_cacheinfo ci;
3813
3814         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3815         if (nlh == NULL)
3816                 return -EMSGSIZE;
3817
3818         pmsg = nlmsg_data(nlh);
3819         pmsg->prefix_family = AF_INET6;
3820         pmsg->prefix_pad1 = 0;
3821         pmsg->prefix_pad2 = 0;
3822         pmsg->prefix_ifindex = idev->dev->ifindex;
3823         pmsg->prefix_len = pinfo->prefix_len;
3824         pmsg->prefix_type = pinfo->type;
3825         pmsg->prefix_pad3 = 0;
3826         pmsg->prefix_flags = 0;
3827         if (pinfo->onlink)
3828                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3829         if (pinfo->autoconf)
3830                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3831
3832         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3833
3834         ci.preferred_time = ntohl(pinfo->prefered);
3835         ci.valid_time = ntohl(pinfo->valid);
3836         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3837
3838         return nlmsg_end(skb, nlh);
3839
3840 nla_put_failure:
3841         nlmsg_cancel(skb, nlh);
3842         return -EMSGSIZE;
3843 }
3844
3845 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3846                          struct prefix_info *pinfo)
3847 {
3848         struct sk_buff *skb;
3849         struct net *net = dev_net(idev->dev);
3850         int err = -ENOBUFS;
3851
3852         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3853         if (skb == NULL)
3854                 goto errout;
3855
3856         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3857         if (err < 0) {
3858                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3859                 WARN_ON(err == -EMSGSIZE);
3860                 kfree_skb(skb);
3861                 goto errout;
3862         }
3863         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3864 errout:
3865         if (err < 0)
3866                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3867 }
3868
3869 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3870 {
3871         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3872
3873         switch (event) {
3874         case RTM_NEWADDR:
3875                 /*
3876                  * If the address was optimistic
3877                  * we inserted the route at the start of
3878                  * our DAD process, so we don't need
3879                  * to do it again
3880                  */
3881                 if (!(ifp->rt->rt6i_node))
3882                         ip6_ins_rt(ifp->rt);
3883                 if (ifp->idev->cnf.forwarding)
3884                         addrconf_join_anycast(ifp);
3885                 break;
3886         case RTM_DELADDR:
3887                 if (ifp->idev->cnf.forwarding)
3888                         addrconf_leave_anycast(ifp);
3889                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3890                 dst_hold(&ifp->rt->u.dst);
3891                 if (ip6_del_rt(ifp->rt))
3892                         dst_free(&ifp->rt->u.dst);
3893                 break;
3894         }
3895 }
3896
3897 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3898 {
3899         rcu_read_lock_bh();
3900         if (likely(ifp->idev->dead == 0))
3901                 __ipv6_ifa_notify(event, ifp);
3902         rcu_read_unlock_bh();
3903 }
3904
3905 #ifdef CONFIG_SYSCTL
3906
3907 static
3908 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3909                            void __user *buffer, size_t *lenp, loff_t *ppos)
3910 {
3911         int *valp = ctl->data;
3912         int val = *valp;
3913         int ret;
3914
3915         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3916
3917         if (write)
3918                 addrconf_fixup_forwarding(ctl, valp, val);
3919         return ret;
3920 }
3921
3922 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3923                                             int __user *name, int nlen,
3924                                             void __user *oldval,
3925                                             size_t __user *oldlenp,
3926                                             void __user *newval, size_t newlen)
3927 {
3928         int *valp = table->data;
3929         int val = *valp;
3930         int new;
3931
3932         if (!newval || !newlen)
3933                 return 0;
3934         if (newlen != sizeof(int))
3935                 return -EINVAL;
3936         if (get_user(new, (int __user *)newval))
3937                 return -EFAULT;
3938         if (new == *valp)
3939                 return 0;
3940         if (oldval && oldlenp) {
3941                 size_t len;
3942                 if (get_user(len, oldlenp))
3943                         return -EFAULT;
3944                 if (len) {
3945                         if (len > table->maxlen)
3946                                 len = table->maxlen;
3947                         if (copy_to_user(oldval, valp, len))
3948                                 return -EFAULT;
3949                         if (put_user(len, oldlenp))
3950                                 return -EFAULT;
3951                 }
3952         }
3953
3954         *valp = new;
3955         addrconf_fixup_forwarding(table, valp, val);
3956         return 1;
3957 }
3958
3959 static struct addrconf_sysctl_table
3960 {
3961         struct ctl_table_header *sysctl_header;
3962         ctl_table addrconf_vars[DEVCONF_MAX+1];
3963         char *dev_name;
3964 } addrconf_sysctl __read_mostly = {
3965         .sysctl_header = NULL,
3966         .addrconf_vars = {
3967                 {
3968                         .ctl_name       =       NET_IPV6_FORWARDING,
3969                         .procname       =       "forwarding",
3970                         .data           =       &ipv6_devconf.forwarding,
3971                         .maxlen         =       sizeof(int),
3972                         .mode           =       0644,
3973                         .proc_handler   =       &addrconf_sysctl_forward,
3974                         .strategy       =       &addrconf_sysctl_forward_strategy,
3975                 },
3976                 {
3977                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3978                         .procname       =       "hop_limit",
3979                         .data           =       &ipv6_devconf.hop_limit,
3980                         .maxlen         =       sizeof(int),
3981                         .mode           =       0644,
3982                         .proc_handler   =       proc_dointvec,
3983                 },
3984                 {
3985                         .ctl_name       =       NET_IPV6_MTU,
3986                         .procname       =       "mtu",
3987                         .data           =       &ipv6_devconf.mtu6,
3988                         .maxlen         =       sizeof(int),
3989                         .mode           =       0644,
3990                         .proc_handler   =       &proc_dointvec,
3991                 },
3992                 {
3993                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3994                         .procname       =       "accept_ra",
3995                         .data           =       &ipv6_devconf.accept_ra,
3996                         .maxlen         =       sizeof(int),
3997                         .mode           =       0644,
3998                         .proc_handler   =       &proc_dointvec,
3999                 },
4000                 {
4001                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
4002                         .procname       =       "accept_redirects",
4003                         .data           =       &ipv6_devconf.accept_redirects,
4004                         .maxlen         =       sizeof(int),
4005                         .mode           =       0644,
4006                         .proc_handler   =       &proc_dointvec,
4007                 },
4008                 {
4009                         .ctl_name       =       NET_IPV6_AUTOCONF,
4010                         .procname       =       "autoconf",
4011                         .data           =       &ipv6_devconf.autoconf,
4012                         .maxlen         =       sizeof(int),
4013                         .mode           =       0644,
4014                         .proc_handler   =       &proc_dointvec,
4015                 },
4016                 {
4017                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
4018                         .procname       =       "dad_transmits",
4019                         .data           =       &ipv6_devconf.dad_transmits,
4020                         .maxlen         =       sizeof(int),
4021                         .mode           =       0644,
4022                         .proc_handler   =       &proc_dointvec,
4023                 },
4024                 {
4025                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
4026                         .procname       =       "router_solicitations",
4027                         .data           =       &ipv6_devconf.rtr_solicits,
4028                         .maxlen         =       sizeof(int),
4029                         .mode           =       0644,
4030                         .proc_handler   =       &proc_dointvec,
4031                 },
4032                 {
4033                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
4034                         .procname       =       "router_solicitation_interval",
4035                         .data           =       &ipv6_devconf.rtr_solicit_interval,
4036                         .maxlen         =       sizeof(int),
4037                         .mode           =       0644,
4038                         .proc_handler   =       &proc_dointvec_jiffies,
4039                         .strategy       =       &sysctl_jiffies,
4040                 },
4041                 {
4042                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
4043                         .procname       =       "router_solicitation_delay",
4044                         .data           =       &ipv6_devconf.rtr_solicit_delay,
4045                         .maxlen         =       sizeof(int),
4046                         .mode           =       0644,
4047                         .proc_handler   =       &proc_dointvec_jiffies,
4048                         .strategy       =       &sysctl_jiffies,
4049                 },
4050                 {
4051                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
4052                         .procname       =       "force_mld_version",
4053                         .data           =       &ipv6_devconf.force_mld_version,
4054                         .maxlen         =       sizeof(int),
4055                         .mode           =       0644,
4056                         .proc_handler   =       &proc_dointvec,
4057                 },
4058 #ifdef CONFIG_IPV6_PRIVACY
4059                 {
4060                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
4061                         .procname       =       "use_tempaddr",
4062                         .data           =       &ipv6_devconf.use_tempaddr,
4063                         .maxlen         =       sizeof(int),
4064                         .mode           =       0644,
4065                         .proc_handler   =       &proc_dointvec,
4066                 },
4067                 {
4068                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
4069                         .procname       =       "temp_valid_lft",
4070                         .data           =       &ipv6_devconf.temp_valid_lft,
4071                         .maxlen         =       sizeof(int),
4072                         .mode           =       0644,
4073                         .proc_handler   =       &proc_dointvec,
4074                 },
4075                 {
4076                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4077                         .procname       =       "temp_prefered_lft",
4078                         .data           =       &ipv6_devconf.temp_prefered_lft,
4079                         .maxlen         =       sizeof(int),
4080                         .mode           =       0644,
4081                         .proc_handler   =       &proc_dointvec,
4082                 },
4083                 {
4084                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4085                         .procname       =       "regen_max_retry",
4086                         .data           =       &ipv6_devconf.regen_max_retry,
4087                         .maxlen         =       sizeof(int),
4088                         .mode           =       0644,
4089                         .proc_handler   =       &proc_dointvec,
4090                 },
4091                 {
4092                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4093                         .procname       =       "max_desync_factor",
4094                         .data           =       &ipv6_devconf.max_desync_factor,
4095                         .maxlen         =       sizeof(int),
4096                         .mode           =       0644,
4097                         .proc_handler   =       &proc_dointvec,
4098                 },
4099 #endif
4100                 {
4101                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4102                         .procname       =       "max_addresses",
4103                         .data           =       &ipv6_devconf.max_addresses,
4104                         .maxlen         =       sizeof(int),
4105                         .mode           =       0644,
4106                         .proc_handler   =       &proc_dointvec,
4107                 },
4108                 {
4109                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4110                         .procname       =       "accept_ra_defrtr",
4111                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4112                         .maxlen         =       sizeof(int),
4113                         .mode           =       0644,
4114                         .proc_handler   =       &proc_dointvec,
4115                 },
4116                 {
4117                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4118                         .procname       =       "accept_ra_pinfo",
4119                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4120                         .maxlen         =       sizeof(int),
4121                         .mode           =       0644,
4122                         .proc_handler   =       &proc_dointvec,
4123                 },
4124 #ifdef CONFIG_IPV6_ROUTER_PREF
4125                 {
4126                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4127                         .procname       =       "accept_ra_rtr_pref",
4128                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4129                         .maxlen         =       sizeof(int),
4130                         .mode           =       0644,
4131                         .proc_handler   =       &proc_dointvec,
4132                 },
4133                 {
4134                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4135                         .procname       =       "router_probe_interval",
4136                         .data           =       &ipv6_devconf.rtr_probe_interval,
4137                         .maxlen         =       sizeof(int),
4138                         .mode           =       0644,
4139                         .proc_handler   =       &proc_dointvec_jiffies,
4140                         .strategy       =       &sysctl_jiffies,
4141                 },
4142 #ifdef CONFIG_IPV6_ROUTE_INFO
4143                 {
4144                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4145                         .procname       =       "accept_ra_rt_info_max_plen",
4146                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4147                         .maxlen         =       sizeof(int),
4148                         .mode           =       0644,
4149                         .proc_handler   =       &proc_dointvec,
4150                 },
4151 #endif
4152 #endif
4153                 {
4154                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4155                         .procname       =       "proxy_ndp",
4156                         .data           =       &ipv6_devconf.proxy_ndp,
4157                         .maxlen         =       sizeof(int),
4158                         .mode           =       0644,
4159                         .proc_handler   =       &proc_dointvec,
4160                 },
4161                 {
4162                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4163                         .procname       =       "accept_source_route",
4164                         .data           =       &ipv6_devconf.accept_source_route,
4165                         .maxlen         =       sizeof(int),
4166                         .mode           =       0644,
4167                         .proc_handler   =       &proc_dointvec,
4168                 },
4169 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4170                 {
4171                         .ctl_name       =       CTL_UNNUMBERED,
4172                         .procname       =       "optimistic_dad",
4173                         .data           =       &ipv6_devconf.optimistic_dad,
4174                         .maxlen         =       sizeof(int),
4175                         .mode           =       0644,
4176                         .proc_handler   =       &proc_dointvec,
4177
4178                 },
4179 #endif
4180 #ifdef CONFIG_IPV6_MROUTE
4181                 {
4182                         .ctl_name       =       CTL_UNNUMBERED,
4183                         .procname       =       "mc_forwarding",
4184                         .data           =       &ipv6_devconf.mc_forwarding,
4185                         .maxlen         =       sizeof(int),
4186                         .mode           =       0644,
4187                         .proc_handler   =       &proc_dointvec,
4188                 },
4189 #endif
4190                 {
4191                         .ctl_name       =       0,      /* sentinel */
4192                 }
4193         },
4194 };
4195
4196 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4197                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4198 {
4199         int i;
4200         struct addrconf_sysctl_table *t;
4201
4202 #define ADDRCONF_CTL_PATH_DEV   3
4203
4204         struct ctl_path addrconf_ctl_path[] = {
4205                 { .procname = "net", .ctl_name = CTL_NET, },
4206                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4207                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4208                 { /* to be set */ },
4209                 { },
4210         };
4211
4212
4213         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4214         if (t == NULL)
4215                 goto out;
4216
4217         for (i=0; t->addrconf_vars[i].data; i++) {
4218                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4219                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4220                 t->addrconf_vars[i].extra2 = net;
4221         }
4222
4223         /*
4224          * Make a copy of dev_name, because '.procname' is regarded as const
4225          * by sysctl and we wouldn't want anyone to change it under our feet
4226          * (see SIOCSIFNAME).
4227          */
4228         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4229         if (!t->dev_name)
4230                 goto free;
4231
4232         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4233         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4234
4235         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4236                         t->addrconf_vars);
4237         if (t->sysctl_header == NULL)
4238                 goto free_procname;
4239
4240         p->sysctl = t;
4241         return 0;
4242
4243 free_procname:
4244         kfree(t->dev_name);
4245 free:
4246         kfree(t);
4247 out:
4248         return -ENOBUFS;
4249 }
4250
4251 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4252 {
4253         struct addrconf_sysctl_table *t;
4254
4255         if (p->sysctl == NULL)
4256                 return;
4257
4258         t = p->sysctl;
4259         p->sysctl = NULL;
4260         unregister_sysctl_table(t->sysctl_header);
4261         kfree(t->dev_name);
4262         kfree(t);
4263 }
4264
4265 static void addrconf_sysctl_register(struct inet6_dev *idev)
4266 {
4267         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4268                               NET_IPV6_NEIGH, "ipv6",
4269                               &ndisc_ifinfo_sysctl_change,
4270                               ndisc_ifinfo_sysctl_strategy);
4271         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4272                         idev->dev->ifindex, idev, &idev->cnf);
4273 }
4274
4275 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4276 {
4277         __addrconf_sysctl_unregister(&idev->cnf);
4278         neigh_sysctl_unregister(idev->nd_parms);
4279 }
4280
4281
4282 #endif
4283
4284 static int addrconf_init_net(struct net *net)
4285 {
4286         int err;
4287         struct ipv6_devconf *all, *dflt;
4288
4289         err = -ENOMEM;
4290         all = &ipv6_devconf;
4291         dflt = &ipv6_devconf_dflt;
4292
4293         if (net != &init_net) {
4294                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4295                 if (all == NULL)
4296                         goto err_alloc_all;
4297
4298                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4299                 if (dflt == NULL)
4300                         goto err_alloc_dflt;
4301         }
4302
4303         net->ipv6.devconf_all = all;
4304         net->ipv6.devconf_dflt = dflt;
4305
4306 #ifdef CONFIG_SYSCTL
4307         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4308                         NULL, all);
4309         if (err < 0)
4310                 goto err_reg_all;
4311
4312         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4313                         NULL, dflt);
4314         if (err < 0)
4315                 goto err_reg_dflt;
4316 #endif
4317         return 0;
4318
4319 #ifdef CONFIG_SYSCTL
4320 err_reg_dflt:
4321         __addrconf_sysctl_unregister(all);
4322 err_reg_all:
4323         kfree(dflt);
4324 #endif
4325 err_alloc_dflt:
4326         kfree(all);
4327 err_alloc_all:
4328         return err;
4329 }
4330
4331 static void addrconf_exit_net(struct net *net)
4332 {
4333 #ifdef CONFIG_SYSCTL
4334         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4335         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4336 #endif
4337         if (net != &init_net) {
4338                 kfree(net->ipv6.devconf_dflt);
4339                 kfree(net->ipv6.devconf_all);
4340         }
4341 }
4342
4343 static struct pernet_operations addrconf_ops = {
4344         .init = addrconf_init_net,
4345         .exit = addrconf_exit_net,
4346 };
4347
4348 /*
4349  *      Device notifier
4350  */
4351
4352 int register_inet6addr_notifier(struct notifier_block *nb)
4353 {
4354         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4355 }
4356
4357 EXPORT_SYMBOL(register_inet6addr_notifier);
4358
4359 int unregister_inet6addr_notifier(struct notifier_block *nb)
4360 {
4361         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4362 }
4363
4364 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4365
4366 static void addrconf_net_exit(struct net *net)
4367 {
4368         struct net_device *dev;
4369
4370         rtnl_lock();
4371         /* clean dev list */
4372         for_each_netdev(net, dev) {
4373                 if (__in6_dev_get(dev) == NULL)
4374                         continue;
4375                 addrconf_ifdown(dev, 1);
4376         }
4377         addrconf_ifdown(net->loopback_dev, 2);
4378         rtnl_unlock();
4379 }
4380
4381 static struct pernet_operations addrconf_net_ops = {
4382         .exit = addrconf_net_exit,
4383 };
4384
4385 /*
4386  *      Init / cleanup code
4387  */
4388
4389 int __init addrconf_init(void)
4390 {
4391         int err;
4392
4393         if ((err = ipv6_addr_label_init()) < 0) {
4394                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4395                         err);
4396                 return err;
4397         }
4398
4399         register_pernet_subsys(&addrconf_ops);
4400
4401         /* The addrconf netdev notifier requires that loopback_dev
4402          * has it's ipv6 private information allocated and setup
4403          * before it can bring up and give link-local addresses
4404          * to other devices which are up.
4405          *
4406          * Unfortunately, loopback_dev is not necessarily the first
4407          * entry in the global dev_base list of net devices.  In fact,
4408          * it is likely to be the very last entry on that list.
4409          * So this causes the notifier registry below to try and
4410          * give link-local addresses to all devices besides loopback_dev
4411          * first, then loopback_dev, which cases all the non-loopback_dev
4412          * devices to fail to get a link-local address.
4413          *
4414          * So, as a temporary fix, allocate the ipv6 structure for
4415          * loopback_dev first by hand.
4416          * Longer term, all of the dependencies ipv6 has upon the loopback
4417          * device and it being up should be removed.
4418          */
4419         rtnl_lock();
4420         if (!ipv6_add_dev(init_net.loopback_dev))
4421                 err = -ENOMEM;
4422         rtnl_unlock();
4423         if (err)
4424                 goto errlo;
4425
4426         err = register_pernet_device(&addrconf_net_ops);
4427         if (err)
4428                 return err;
4429
4430         register_netdevice_notifier(&ipv6_dev_notf);
4431
4432         addrconf_verify(0);
4433
4434         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4435         if (err < 0)
4436                 goto errout;
4437
4438         /* Only the first call to __rtnl_register can fail */
4439         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4440         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4441         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4442         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4443         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4444
4445         ipv6_addr_label_rtnl_register();
4446
4447         return 0;
4448 errout:
4449         unregister_netdevice_notifier(&ipv6_dev_notf);
4450 errlo:
4451         unregister_pernet_subsys(&addrconf_ops);
4452
4453         return err;
4454 }
4455
4456 void addrconf_cleanup(void)
4457 {
4458         struct inet6_ifaddr *ifa;
4459         int i;
4460
4461         unregister_netdevice_notifier(&ipv6_dev_notf);
4462         unregister_pernet_device(&addrconf_net_ops);
4463
4464         unregister_pernet_subsys(&addrconf_ops);
4465
4466         rtnl_lock();
4467
4468         /*
4469          *      Check hash table.
4470          */
4471         write_lock_bh(&addrconf_hash_lock);
4472         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4473                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4474                         struct inet6_ifaddr *bifa;
4475
4476                         bifa = ifa;
4477                         ifa = ifa->lst_next;
4478                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4479                         /* Do not free it; something is wrong.
4480                            Now we can investigate it with debugger.
4481                          */
4482                 }
4483         }
4484         write_unlock_bh(&addrconf_hash_lock);
4485
4486         del_timer(&addr_chk_timer);
4487         rtnl_unlock();
4488
4489         unregister_pernet_subsys(&addrconf_net_ops);
4490 }