net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #include <linux/errno.h>
  42 #include <linux/types.h>
  43 #include <linux/kernel.h>
  44 #include <linux/socket.h>
  45 #include <linux/sockios.h>
  46 #include <linux/net.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.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 <linux/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
 102 static inline u32 cstamp_delta(unsigned long cstamp)
 103 {
 104         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 105 }
 106
 107 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
 108 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
 109 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
 110
 111 #ifdef CONFIG_SYSCTL
 112 static void addrconf_sysctl_register(struct inet6_dev *idev);
 113 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 114 #else
 115 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 116 {
 117 }
 118
 119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 120 {
 121 }
 122 #endif
 123
 124 #ifdef CONFIG_IPV6_PRIVACY
 125 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 127 static void ipv6_regen_rndid(unsigned long data);
 128 #endif
 129
 130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 131 static int ipv6_count_addresses(struct inet6_dev *idev);
 132
 133 /*
 134  *      Configured unicast address hash table
 135  */
 136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 137 static DEFINE_SPINLOCK(addrconf_hash_lock);
 138
 139 static void addrconf_verify(unsigned long);
 140
 141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 142 static DEFINE_SPINLOCK(addrconf_verify_lock);
 143
 144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 146
 147 static void addrconf_type_change(struct net_device *dev,
 148                                  unsigned long event);
 149 static int addrconf_ifdown(struct net_device *dev, int how);
 150
 151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 152 static void addrconf_dad_timer(unsigned long data);
 153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 154 static void addrconf_dad_run(struct inet6_dev *idev);
 155 static void addrconf_rs_timer(unsigned long data);
 156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 158
 159 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 160                                 struct prefix_info *pinfo);
 161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 162                                struct net_device *dev);
 163
 164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 165
 166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 167         .forwarding             = 0,
 168         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 169         .mtu6                   = IPV6_MIN_MTU,
 170         .accept_ra              = 1,
 171         .accept_redirects       = 1,
 172         .autoconf               = 1,
 173         .force_mld_version      = 0,
 174         .dad_transmits          = 1,
 175         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 176         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 177         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 178 #ifdef CONFIG_IPV6_PRIVACY
 179         .use_tempaddr           = 0,
 180         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 181         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 182         .regen_max_retry        = REGEN_MAX_RETRY,
 183         .max_desync_factor      = MAX_DESYNC_FACTOR,
 184 #endif
 185         .max_addresses          = IPV6_MAX_ADDRESSES,
 186         .accept_ra_defrtr       = 1,
 187         .accept_ra_pinfo        = 1,
 188 #ifdef CONFIG_IPV6_ROUTER_PREF
 189         .accept_ra_rtr_pref     = 1,
 190         .rtr_probe_interval     = 60 * HZ,
 191 #ifdef CONFIG_IPV6_ROUTE_INFO
 192         .accept_ra_rt_info_max_plen = 0,
 193 #endif
 194 #endif
 195         .proxy_ndp              = 0,
 196         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 197         .disable_ipv6           = 0,
 198         .accept_dad             = 1,
 199 };
 200
 201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 202         .forwarding             = 0,
 203         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 204         .mtu6                   = IPV6_MIN_MTU,
 205         .accept_ra              = 1,
 206         .accept_redirects       = 1,
 207         .autoconf               = 1,
 208         .dad_transmits          = 1,
 209         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 210         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 211         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 212 #ifdef CONFIG_IPV6_PRIVACY
 213         .use_tempaddr           = 0,
 214         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 215         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 216         .regen_max_retry        = REGEN_MAX_RETRY,
 217         .max_desync_factor      = MAX_DESYNC_FACTOR,
 218 #endif
 219         .max_addresses          = IPV6_MAX_ADDRESSES,
 220         .accept_ra_defrtr       = 1,
 221         .accept_ra_pinfo        = 1,
 222 #ifdef CONFIG_IPV6_ROUTER_PREF
 223         .accept_ra_rtr_pref     = 1,
 224         .rtr_probe_interval     = 60 * HZ,
 225 #ifdef CONFIG_IPV6_ROUTE_INFO
 226         .accept_ra_rt_info_max_plen = 0,
 227 #endif
 228 #endif
 229         .proxy_ndp              = 0,
 230         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 231         .disable_ipv6           = 0,
 232         .accept_dad             = 1,
 233 };
 234
 235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 240
 241 /* Check if a valid qdisc is available */
 242 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 243 {
 244         return !qdisc_tx_is_noop(dev);
 245 }
 246
 247 /* Check if a route is valid prefix route */
 248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 249 {
 250         return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
 251 }
 252
 253 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 254 {
 255         if (del_timer(&ifp->timer))
 256                 __in6_ifa_put(ifp);
 257 }
 258
 259 enum addrconf_timer_t {
 260         AC_NONE,
 261         AC_DAD,
 262         AC_RS,
 263 };
 264
 265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 266                                enum addrconf_timer_t what,
 267                                unsigned long when)
 268 {
 269         if (!del_timer(&ifp->timer))
 270                 in6_ifa_hold(ifp);
 271
 272         switch (what) {
 273         case AC_DAD:
 274                 ifp->timer.function = addrconf_dad_timer;
 275                 break;
 276         case AC_RS:
 277                 ifp->timer.function = addrconf_rs_timer;
 278                 break;
 279         default:
 280                 break;
 281         }
 282         ifp->timer.expires = jiffies + when;
 283         add_timer(&ifp->timer);
 284 }
 285
 286 static int snmp6_alloc_dev(struct inet6_dev *idev)
 287 {
 288         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 289                           sizeof(struct ipstats_mib),
 290                           __alignof__(struct ipstats_mib)) < 0)
 291                 goto err_ip;
 292         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 293                                         GFP_KERNEL);
 294         if (!idev->stats.icmpv6dev)
 295                 goto err_icmp;
 296         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 297                                            GFP_KERNEL);
 298         if (!idev->stats.icmpv6msgdev)
 299                 goto err_icmpmsg;
 300
 301         return 0;
 302
 303 err_icmpmsg:
 304         kfree(idev->stats.icmpv6dev);
 305 err_icmp:
 306         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 307 err_ip:
 308         return -ENOMEM;
 309 }
 310
 311 static void snmp6_free_dev(struct inet6_dev *idev)
 312 {
 313         kfree(idev->stats.icmpv6msgdev);
 314         kfree(idev->stats.icmpv6dev);
 315         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 316 }
 317
 318 /* Nobody refers to this device, we may destroy it. */
 319
 320 void in6_dev_finish_destroy(struct inet6_dev *idev)
 321 {
 322         struct net_device *dev = idev->dev;
 323
 324         WARN_ON(!list_empty(&idev->addr_list));
 325         WARN_ON(idev->mc_list != NULL);
 326
 327 #ifdef NET_REFCNT_DEBUG
 328         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 329 #endif
 330         dev_put(dev);
 331         if (!idev->dead) {
 332                 pr_warning("Freeing alive inet6 device %p\n", idev);
 333                 return;
 334         }
 335         snmp6_free_dev(idev);
 336         kfree_rcu(idev, rcu);
 337 }
 338
 339 EXPORT_SYMBOL(in6_dev_finish_destroy);
 340
 341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 342 {
 343         struct inet6_dev *ndev;
 344
 345         ASSERT_RTNL();
 346
 347         if (dev->mtu < IPV6_MIN_MTU)
 348                 return NULL;
 349
 350         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 351
 352         if (ndev == NULL)
 353                 return NULL;
 354
 355         rwlock_init(&ndev->lock);
 356         ndev->dev = dev;
 357         INIT_LIST_HEAD(&ndev->addr_list);
 358
 359         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 360         ndev->cnf.mtu6 = dev->mtu;
 361         ndev->cnf.sysctl = NULL;
 362         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 363         if (ndev->nd_parms == NULL) {
 364                 kfree(ndev);
 365                 return NULL;
 366         }
 367         if (ndev->cnf.forwarding)
 368                 dev_disable_lro(dev);
 369         /* We refer to the device */
 370         dev_hold(dev);
 371
 372         if (snmp6_alloc_dev(ndev) < 0) {
 373                 ADBG((KERN_WARNING
 374                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 375                         __func__, dev->name));
 376                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 377                 ndev->dead = 1;
 378                 in6_dev_finish_destroy(ndev);
 379                 return NULL;
 380         }
 381
 382         if (snmp6_register_dev(ndev) < 0) {
 383                 ADBG((KERN_WARNING
 384                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 385                         __func__, dev->name));
 386                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 387                 ndev->dead = 1;
 388                 in6_dev_finish_destroy(ndev);
 389                 return NULL;
 390         }
 391
 392         /* One reference from device.  We must do this before
 393          * we invoke __ipv6_regen_rndid().
 394          */
 395         in6_dev_hold(ndev);
 396
 397         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 398                 ndev->cnf.accept_dad = -1;
 399
 400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 401         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 402                 printk(KERN_INFO
 403                        "%s: Disabled Multicast RS\n",
 404                        dev->name);
 405                 ndev->cnf.rtr_solicits = 0;
 406         }
 407 #endif
 408
 409 #ifdef CONFIG_IPV6_PRIVACY
 410         INIT_LIST_HEAD(&ndev->tempaddr_list);
 411         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 412         if ((dev->flags&IFF_LOOPBACK) ||
 413             dev->type == ARPHRD_TUNNEL ||
 414             dev->type == ARPHRD_TUNNEL6 ||
 415             dev->type == ARPHRD_SIT ||
 416             dev->type == ARPHRD_NONE) {
 417                 ndev->cnf.use_tempaddr = -1;
 418         } else {
 419                 in6_dev_hold(ndev);
 420                 ipv6_regen_rndid((unsigned long) ndev);
 421         }
 422 #endif
 423
 424         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 425                 ndev->if_flags |= IF_READY;
 426
 427         ipv6_mc_init_dev(ndev);
 428         ndev->tstamp = jiffies;
 429         addrconf_sysctl_register(ndev);
 430         /* protected by rtnl_lock */
 431         rcu_assign_pointer(dev->ip6_ptr, ndev);
 432
 433         /* Join all-node multicast group */
 434         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 435
 436         /* Join all-router multicast group if forwarding is set */
 437         if (ndev->cnf.forwarding && dev && (dev->flags & IFF_MULTICAST))
 438                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 439
 440         return ndev;
 441 }
 442
 443 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 444 {
 445         struct inet6_dev *idev;
 446
 447         ASSERT_RTNL();
 448
 449         idev = __in6_dev_get(dev);
 450         if (!idev) {
 451                 idev = ipv6_add_dev(dev);
 452                 if (!idev)
 453                         return NULL;
 454         }
 455
 456         if (dev->flags&IFF_UP)
 457                 ipv6_mc_up(idev);
 458         return idev;
 459 }
 460
 461 #ifdef CONFIG_SYSCTL
 462 static void dev_forward_change(struct inet6_dev *idev)
 463 {
 464         struct net_device *dev;
 465         struct inet6_ifaddr *ifa;
 466
 467         if (!idev)
 468                 return;
 469         dev = idev->dev;
 470         if (idev->cnf.forwarding)
 471                 dev_disable_lro(dev);
 472         if (dev && (dev->flags & IFF_MULTICAST)) {
 473                 if (idev->cnf.forwarding)
 474                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 475                 else
 476                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 477         }
 478
 479         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 480                 if (ifa->flags&IFA_F_TENTATIVE)
 481                         continue;
 482                 if (idev->cnf.forwarding)
 483                         addrconf_join_anycast(ifa);
 484                 else
 485                         addrconf_leave_anycast(ifa);
 486         }
 487 }
 488
 489
 490 static void addrconf_forward_change(struct net *net, __s32 newf)
 491 {
 492         struct net_device *dev;
 493         struct inet6_dev *idev;
 494
 495         for_each_netdev(net, dev) {
 496                 idev = __in6_dev_get(dev);
 497                 if (idev) {
 498                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 499                         idev->cnf.forwarding = newf;
 500                         if (changed)
 501                                 dev_forward_change(idev);
 502                 }
 503         }
 504 }
 505
 506 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 507 {
 508         struct net *net;
 509
 510         net = (struct net *)table->extra2;
 511         if (p == &net->ipv6.devconf_dflt->forwarding)
 512                 return 0;
 513
 514         if (!rtnl_trylock()) {
 515                 /* Restore the original values before restarting */
 516                 *p = old;
 517                 return restart_syscall();
 518         }
 519
 520         if (p == &net->ipv6.devconf_all->forwarding) {
 521                 __s32 newf = net->ipv6.devconf_all->forwarding;
 522                 net->ipv6.devconf_dflt->forwarding = newf;
 523                 addrconf_forward_change(net, newf);
 524         } else if ((!*p) ^ (!old))
 525                 dev_forward_change((struct inet6_dev *)table->extra1);
 526         rtnl_unlock();
 527
 528         if (*p)
 529                 rt6_purge_dflt_routers(net);
 530         return 1;
 531 }
 532 #endif
 533
 534 /* Nobody refers to this ifaddr, destroy it */
 535 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 536 {
 537         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 538
 539 #ifdef NET_REFCNT_DEBUG
 540         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 541 #endif
 542
 543         in6_dev_put(ifp->idev);
 544
 545         if (del_timer(&ifp->timer))
 546                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 547
 548         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 549                 pr_warning("Freeing alive inet6 address %p\n", ifp);
 550                 return;
 551         }
 552         dst_release(&ifp->rt->dst);
 553
 554         kfree_rcu(ifp, rcu);
 555 }
 556
 557 static void
 558 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 559 {
 560         struct list_head *p;
 561         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 562
 563         /*
 564          * Each device address list is sorted in order of scope -
 565          * global before linklocal.
 566          */
 567         list_for_each(p, &idev->addr_list) {
 568                 struct inet6_ifaddr *ifa
 569                         = list_entry(p, struct inet6_ifaddr, if_list);
 570                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 571                         break;
 572         }
 573
 574         list_add_tail(&ifp->if_list, p);
 575 }
 576
 577 static u32 ipv6_addr_hash(const struct in6_addr *addr)
 578 {
 579         /*
 580          * We perform the hash function over the last 64 bits of the address
 581          * This will include the IEEE address token on links that support it.
 582          */
 583         return jhash_2words((__force u32)addr->s6_addr32[2],
 584                             (__force u32)addr->s6_addr32[3], 0)
 585                 & (IN6_ADDR_HSIZE - 1);
 586 }
 587
 588 /* On success it returns ifp with increased reference count */
 589
 590 static struct inet6_ifaddr *
 591 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 592               int scope, u32 flags)
 593 {
 594         struct inet6_ifaddr *ifa = NULL;
 595         struct rt6_info *rt;
 596         unsigned int hash;
 597         int err = 0;
 598         int addr_type = ipv6_addr_type(addr);
 599
 600         if (addr_type == IPV6_ADDR_ANY ||
 601             addr_type & IPV6_ADDR_MULTICAST ||
 602             (!(idev->dev->flags & IFF_LOOPBACK) &&
 603              addr_type & IPV6_ADDR_LOOPBACK))
 604                 return ERR_PTR(-EADDRNOTAVAIL);
 605
 606         rcu_read_lock_bh();
 607         if (idev->dead) {
 608                 err = -ENODEV;                  /*XXX*/
 609                 goto out2;
 610         }
 611
 612         if (idev->cnf.disable_ipv6) {
 613                 err = -EACCES;
 614                 goto out2;
 615         }
 616
 617         spin_lock(&addrconf_hash_lock);
 618
 619         /* Ignore adding duplicate addresses on an interface */
 620         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 621                 ADBG(("ipv6_add_addr: already assigned\n"));
 622                 err = -EEXIST;
 623                 goto out;
 624         }
 625
 626         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 627
 628         if (ifa == NULL) {
 629                 ADBG(("ipv6_add_addr: malloc failed\n"));
 630                 err = -ENOBUFS;
 631                 goto out;
 632         }
 633
 634         rt = addrconf_dst_alloc(idev, addr, 0);
 635         if (IS_ERR(rt)) {
 636                 err = PTR_ERR(rt);
 637                 goto out;
 638         }
 639
 640         ipv6_addr_copy(&ifa->addr, addr);
 641
 642         spin_lock_init(&ifa->lock);
 643         spin_lock_init(&ifa->state_lock);
 644         init_timer(&ifa->timer);
 645         INIT_HLIST_NODE(&ifa->addr_lst);
 646         ifa->timer.data = (unsigned long) ifa;
 647         ifa->scope = scope;
 648         ifa->prefix_len = pfxlen;
 649         ifa->flags = flags | IFA_F_TENTATIVE;
 650         ifa->cstamp = ifa->tstamp = jiffies;
 651
 652         ifa->rt = rt;
 653
 654         /*
 655          * part one of RFC 4429, section 3.3
 656          * We should not configure an address as
 657          * optimistic if we do not yet know the link
 658          * layer address of our nexhop router
 659          */
 660
 661         if (dst_get_neighbour_raw(&rt->dst) == NULL)
 662                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 663
 664         ifa->idev = idev;
 665         in6_dev_hold(idev);
 666         /* For caller */
 667         in6_ifa_hold(ifa);
 668
 669         /* Add to big hash table */
 670         hash = ipv6_addr_hash(addr);
 671
 672         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 673         spin_unlock(&addrconf_hash_lock);
 674
 675         write_lock(&idev->lock);
 676         /* Add to inet6_dev unicast addr list. */
 677         ipv6_link_dev_addr(idev, ifa);
 678
 679 #ifdef CONFIG_IPV6_PRIVACY
 680         if (ifa->flags&IFA_F_TEMPORARY) {
 681                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 682                 in6_ifa_hold(ifa);
 683         }
 684 #endif
 685
 686         in6_ifa_hold(ifa);
 687         write_unlock(&idev->lock);
 688 out2:
 689         rcu_read_unlock_bh();
 690
 691         if (likely(err == 0))
 692                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 693         else {
 694                 kfree(ifa);
 695                 ifa = ERR_PTR(err);
 696         }
 697
 698         return ifa;
 699 out:
 700         spin_unlock(&addrconf_hash_lock);
 701         goto out2;
 702 }
 703
 704 /* This function wants to get referenced ifp and releases it before return */
 705
 706 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 707 {
 708         struct inet6_ifaddr *ifa, *ifn;
 709         struct inet6_dev *idev = ifp->idev;
 710         int state;
 711         int deleted = 0, onlink = 0;
 712         unsigned long expires = jiffies;
 713
 714         spin_lock_bh(&ifp->state_lock);
 715         state = ifp->state;
 716         ifp->state = INET6_IFADDR_STATE_DEAD;
 717         spin_unlock_bh(&ifp->state_lock);
 718
 719         if (state == INET6_IFADDR_STATE_DEAD)
 720                 goto out;
 721
 722         spin_lock_bh(&addrconf_hash_lock);
 723         hlist_del_init_rcu(&ifp->addr_lst);
 724         spin_unlock_bh(&addrconf_hash_lock);
 725
 726         write_lock_bh(&idev->lock);
 727 #ifdef CONFIG_IPV6_PRIVACY
 728         if (ifp->flags&IFA_F_TEMPORARY) {
 729                 list_del(&ifp->tmp_list);
 730                 if (ifp->ifpub) {
 731                         in6_ifa_put(ifp->ifpub);
 732                         ifp->ifpub = NULL;
 733                 }
 734                 __in6_ifa_put(ifp);
 735         }
 736 #endif
 737
 738         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 739                 if (ifa == ifp) {
 740                         list_del_init(&ifp->if_list);
 741                         __in6_ifa_put(ifp);
 742
 743                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 744                                 break;
 745                         deleted = 1;
 746                         continue;
 747                 } else if (ifp->flags & IFA_F_PERMANENT) {
 748                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 749                                               ifp->prefix_len)) {
 750                                 if (ifa->flags & IFA_F_PERMANENT) {
 751                                         onlink = 1;
 752                                         if (deleted)
 753                                                 break;
 754                                 } else {
 755                                         unsigned long lifetime;
 756
 757                                         if (!onlink)
 758                                                 onlink = -1;
 759
 760                                         spin_lock(&ifa->lock);
 761
 762                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 763                                         /*
 764                                          * Note: Because this address is
 765                                          * not permanent, lifetime <
 766                                          * LONG_MAX / HZ here.
 767                                          */
 768                                         if (time_before(expires,
 769                                                         ifa->tstamp + lifetime * HZ))
 770                                                 expires = ifa->tstamp + lifetime * HZ;
 771                                         spin_unlock(&ifa->lock);
 772                                 }
 773                         }
 774                 }
 775         }
 776         write_unlock_bh(&idev->lock);
 777
 778         addrconf_del_timer(ifp);
 779
 780         ipv6_ifa_notify(RTM_DELADDR, ifp);
 781
 782         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 783
 784         /*
 785          * Purge or update corresponding prefix
 786          *
 787          * 1) we don't purge prefix here if address was not permanent.
 788          *    prefix is managed by its own lifetime.
 789          * 2) if there're no addresses, delete prefix.
 790          * 3) if there're still other permanent address(es),
 791          *    corresponding prefix is still permanent.
 792          * 4) otherwise, update prefix lifetime to the
 793          *    longest valid lifetime among the corresponding
 794          *    addresses on the device.
 795          *    Note: subsequent RA will update lifetime.
 796          *
 797          * --yoshfuji
 798          */
 799         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 800                 struct in6_addr prefix;
 801                 struct rt6_info *rt;
 802                 struct net *net = dev_net(ifp->idev->dev);
 803                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 804                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 805
 806                 if (rt && addrconf_is_prefix_route(rt)) {
 807                         if (onlink == 0) {
 808                                 ip6_del_rt(rt);
 809                                 rt = NULL;
 810                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 811                                 rt->rt6i_expires = expires;
 812                                 rt->rt6i_flags |= RTF_EXPIRES;
 813                         }
 814                 }
 815                 dst_release(&rt->dst);
 816         }
 817
 818         /* clean up prefsrc entries */
 819         rt6_remove_prefsrc(ifp);
 820 out:
 821         in6_ifa_put(ifp);
 822 }
 823
 824 #ifdef CONFIG_IPV6_PRIVACY
 825 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 826 {
 827         struct inet6_dev *idev = ifp->idev;
 828         struct in6_addr addr, *tmpaddr;
 829         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
 830         unsigned long regen_advance;
 831         int tmp_plen;
 832         int ret = 0;
 833         int max_addresses;
 834         u32 addr_flags;
 835         unsigned long now = jiffies;
 836
 837         write_lock(&idev->lock);
 838         if (ift) {
 839                 spin_lock_bh(&ift->lock);
 840                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 841                 spin_unlock_bh(&ift->lock);
 842                 tmpaddr = &addr;
 843         } else {
 844                 tmpaddr = NULL;
 845         }
 846 retry:
 847         in6_dev_hold(idev);
 848         if (idev->cnf.use_tempaddr <= 0) {
 849                 write_unlock(&idev->lock);
 850                 printk(KERN_INFO
 851                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 852                 in6_dev_put(idev);
 853                 ret = -1;
 854                 goto out;
 855         }
 856         spin_lock_bh(&ifp->lock);
 857         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 858                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 859                 spin_unlock_bh(&ifp->lock);
 860                 write_unlock(&idev->lock);
 861                 printk(KERN_WARNING
 862                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 863                 in6_dev_put(idev);
 864                 ret = -1;
 865                 goto out;
 866         }
 867         in6_ifa_hold(ifp);
 868         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 869         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 870                 spin_unlock_bh(&ifp->lock);
 871                 write_unlock(&idev->lock);
 872                 printk(KERN_WARNING
 873                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 874                 in6_ifa_put(ifp);
 875                 in6_dev_put(idev);
 876                 ret = -1;
 877                 goto out;
 878         }
 879         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 880         age = (now - ifp->tstamp) / HZ;
 881         tmp_valid_lft = min_t(__u32,
 882                               ifp->valid_lft,
 883                               idev->cnf.temp_valid_lft + age);
 884         tmp_prefered_lft = min_t(__u32,
 885                                  ifp->prefered_lft,
 886                                  idev->cnf.temp_prefered_lft + age -
 887                                  idev->cnf.max_desync_factor);
 888         tmp_plen = ifp->prefix_len;
 889         max_addresses = idev->cnf.max_addresses;
 890         tmp_tstamp = ifp->tstamp;
 891         spin_unlock_bh(&ifp->lock);
 892
 893         regen_advance = idev->cnf.regen_max_retry *
 894                         idev->cnf.dad_transmits *
 895                         idev->nd_parms->retrans_time / HZ;
 896         write_unlock(&idev->lock);
 897
 898         /* A temporary address is created only if this calculated Preferred
 899          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 900          * an implementation must not create a temporary address with a zero
 901          * Preferred Lifetime.
 902          */
 903         if (tmp_prefered_lft <= regen_advance) {
 904                 in6_ifa_put(ifp);
 905                 in6_dev_put(idev);
 906                 ret = -1;
 907                 goto out;
 908         }
 909
 910         addr_flags = IFA_F_TEMPORARY;
 911         /* set in addrconf_prefix_rcv() */
 912         if (ifp->flags & IFA_F_OPTIMISTIC)
 913                 addr_flags |= IFA_F_OPTIMISTIC;
 914
 915         ift = !max_addresses ||
 916               ipv6_count_addresses(idev) < max_addresses ?
 917                 ipv6_add_addr(idev, &addr, tmp_plen,
 918                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 919                               addr_flags) : NULL;
 920         if (!ift || IS_ERR(ift)) {
 921                 in6_ifa_put(ifp);
 922                 in6_dev_put(idev);
 923                 printk(KERN_INFO
 924                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 925                 tmpaddr = &addr;
 926                 write_lock(&idev->lock);
 927                 goto retry;
 928         }
 929
 930         spin_lock_bh(&ift->lock);
 931         ift->ifpub = ifp;
 932         ift->valid_lft = tmp_valid_lft;
 933         ift->prefered_lft = tmp_prefered_lft;
 934         ift->cstamp = now;
 935         ift->tstamp = tmp_tstamp;
 936         spin_unlock_bh(&ift->lock);
 937
 938         addrconf_dad_start(ift, 0);
 939         in6_ifa_put(ift);
 940         in6_dev_put(idev);
 941 out:
 942         return ret;
 943 }
 944 #endif
 945
 946 /*
 947  *      Choose an appropriate source address (RFC3484)
 948  */
 949 enum {
 950         IPV6_SADDR_RULE_INIT = 0,
 951         IPV6_SADDR_RULE_LOCAL,
 952         IPV6_SADDR_RULE_SCOPE,
 953         IPV6_SADDR_RULE_PREFERRED,
 954 #ifdef CONFIG_IPV6_MIP6
 955         IPV6_SADDR_RULE_HOA,
 956 #endif
 957         IPV6_SADDR_RULE_OIF,
 958         IPV6_SADDR_RULE_LABEL,
 959 #ifdef CONFIG_IPV6_PRIVACY
 960         IPV6_SADDR_RULE_PRIVACY,
 961 #endif
 962         IPV6_SADDR_RULE_ORCHID,
 963         IPV6_SADDR_RULE_PREFIX,
 964         IPV6_SADDR_RULE_MAX
 965 };
 966
 967 struct ipv6_saddr_score {
 968         int                     rule;
 969         int                     addr_type;
 970         struct inet6_ifaddr     *ifa;
 971         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 972         int                     scopedist;
 973         int                     matchlen;
 974 };
 975
 976 struct ipv6_saddr_dst {
 977         const struct in6_addr *addr;
 978         int ifindex;
 979         int scope;
 980         int label;
 981         unsigned int prefs;
 982 };
 983
 984 static inline int ipv6_saddr_preferred(int type)
 985 {
 986         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
 987                 return 1;
 988         return 0;
 989 }
 990
 991 static int ipv6_get_saddr_eval(struct net *net,
 992                                struct ipv6_saddr_score *score,
 993                                struct ipv6_saddr_dst *dst,
 994                                int i)
 995 {
 996         int ret;
 997
 998         if (i <= score->rule) {
 999                 switch (i) {
1000                 case IPV6_SADDR_RULE_SCOPE:
1001                         ret = score->scopedist;
1002                         break;
1003                 case IPV6_SADDR_RULE_PREFIX:
1004                         ret = score->matchlen;
1005                         break;
1006                 default:
1007                         ret = !!test_bit(i, score->scorebits);
1008                 }
1009                 goto out;
1010         }
1011
1012         switch (i) {
1013         case IPV6_SADDR_RULE_INIT:
1014                 /* Rule 0: remember if hiscore is not ready yet */
1015                 ret = !!score->ifa;
1016                 break;
1017         case IPV6_SADDR_RULE_LOCAL:
1018                 /* Rule 1: Prefer same address */
1019                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1020                 break;
1021         case IPV6_SADDR_RULE_SCOPE:
1022                 /* Rule 2: Prefer appropriate scope
1023                  *
1024                  *      ret
1025                  *       ^
1026                  *    -1 |  d 15
1027                  *    ---+--+-+---> scope
1028                  *       |
1029                  *       |             d is scope of the destination.
1030                  *  B-d  |  \
1031                  *       |   \      <- smaller scope is better if
1032                  *  B-15 |    \        if scope is enough for destinaion.
1033                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1034                  * d-C-1 | /
1035                  *       |/         <- greater is better
1036                  *   -C  /             if scope is not enough for destination.
1037                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1038                  *
1039                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1040                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1041                  * Assume B = 0 and we get C > 29.
1042                  */
1043                 ret = __ipv6_addr_src_scope(score->addr_type);
1044                 if (ret >= dst->scope)
1045                         ret = -ret;
1046                 else
1047                         ret -= 128;     /* 30 is enough */
1048                 score->scopedist = ret;
1049                 break;
1050         case IPV6_SADDR_RULE_PREFERRED:
1051                 /* Rule 3: Avoid deprecated and optimistic addresses */
1052                 ret = ipv6_saddr_preferred(score->addr_type) ||
1053                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1054                 break;
1055 #ifdef CONFIG_IPV6_MIP6
1056         case IPV6_SADDR_RULE_HOA:
1057             {
1058                 /* Rule 4: Prefer home address */
1059                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1060                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1061                 break;
1062             }
1063 #endif
1064         case IPV6_SADDR_RULE_OIF:
1065                 /* Rule 5: Prefer outgoing interface */
1066                 ret = (!dst->ifindex ||
1067                        dst->ifindex == score->ifa->idev->dev->ifindex);
1068                 break;
1069         case IPV6_SADDR_RULE_LABEL:
1070                 /* Rule 6: Prefer matching label */
1071                 ret = ipv6_addr_label(net,
1072                                       &score->ifa->addr, score->addr_type,
1073                                       score->ifa->idev->dev->ifindex) == dst->label;
1074                 break;
1075 #ifdef CONFIG_IPV6_PRIVACY
1076         case IPV6_SADDR_RULE_PRIVACY:
1077             {
1078                 /* Rule 7: Prefer public address
1079                  * Note: prefer temporary address if use_tempaddr >= 2
1080                  */
1081                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1082                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1083                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1084                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1085                 break;
1086             }
1087 #endif
1088         case IPV6_SADDR_RULE_ORCHID:
1089                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1090                  *          non-ORCHID vs non-ORCHID
1091                  */
1092                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1093                         ipv6_addr_orchid(dst->addr));
1094                 break;
1095         case IPV6_SADDR_RULE_PREFIX:
1096                 /* Rule 8: Use longest matching prefix */
1097                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1098                                                        dst->addr);
1099                 break;
1100         default:
1101                 ret = 0;
1102         }
1103
1104         if (ret)
1105                 __set_bit(i, score->scorebits);
1106         score->rule = i;
1107 out:
1108         return ret;
1109 }
1110
1111 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1112                        const struct in6_addr *daddr, unsigned int prefs,
1113                        struct in6_addr *saddr)
1114 {
1115         struct ipv6_saddr_score scores[2],
1116                                 *score = &scores[0], *hiscore = &scores[1];
1117         struct ipv6_saddr_dst dst;
1118         struct net_device *dev;
1119         int dst_type;
1120
1121         dst_type = __ipv6_addr_type(daddr);
1122         dst.addr = daddr;
1123         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1124         dst.scope = __ipv6_addr_src_scope(dst_type);
1125         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1126         dst.prefs = prefs;
1127
1128         hiscore->rule = -1;
1129         hiscore->ifa = NULL;
1130
1131         rcu_read_lock();
1132
1133         for_each_netdev_rcu(net, dev) {
1134                 struct inet6_dev *idev;
1135
1136                 /* Candidate Source Address (section 4)
1137                  *  - multicast and link-local destination address,
1138                  *    the set of candidate source address MUST only
1139                  *    include addresses assigned to interfaces
1140                  *    belonging to the same link as the outgoing
1141                  *    interface.
1142                  * (- For site-local destination addresses, the
1143                  *    set of candidate source addresses MUST only
1144                  *    include addresses assigned to interfaces
1145                  *    belonging to the same site as the outgoing
1146                  *    interface.)
1147                  */
1148                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1149                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1150                     dst.ifindex && dev->ifindex != dst.ifindex)
1151                         continue;
1152
1153                 idev = __in6_dev_get(dev);
1154                 if (!idev)
1155                         continue;
1156
1157                 read_lock_bh(&idev->lock);
1158                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1159                         int i;
1160
1161                         /*
1162                          * - Tentative Address (RFC2462 section 5.4)
1163                          *  - A tentative address is not considered
1164                          *    "assigned to an interface" in the traditional
1165                          *    sense, unless it is also flagged as optimistic.
1166                          * - Candidate Source Address (section 4)
1167                          *  - In any case, anycast addresses, multicast
1168                          *    addresses, and the unspecified address MUST
1169                          *    NOT be included in a candidate set.
1170                          */
1171                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1172                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1173                                 continue;
1174
1175                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1176
1177                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1178                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1179                                 LIMIT_NETDEBUG(KERN_DEBUG
1180                                                "ADDRCONF: unspecified / multicast address "
1181                                                "assigned as unicast address on %s",
1182                                                dev->name);
1183                                 continue;
1184                         }
1185
1186                         score->rule = -1;
1187                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1188
1189                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1190                                 int minihiscore, miniscore;
1191
1192                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1193                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1194
1195                                 if (minihiscore > miniscore) {
1196                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1197                                             score->scopedist > 0) {
1198                                                 /*
1199                                                  * special case:
1200                                                  * each remaining entry
1201                                                  * has too small (not enough)
1202                                                  * scope, because ifa entries
1203                                                  * are sorted by their scope
1204                                                  * values.
1205                                                  */
1206                                                 goto try_nextdev;
1207                                         }
1208                                         break;
1209                                 } else if (minihiscore < miniscore) {
1210                                         if (hiscore->ifa)
1211                                                 in6_ifa_put(hiscore->ifa);
1212
1213                                         in6_ifa_hold(score->ifa);
1214
1215                                         swap(hiscore, score);
1216
1217                                         /* restore our iterator */
1218                                         score->ifa = hiscore->ifa;
1219
1220                                         break;
1221                                 }
1222                         }
1223                 }
1224 try_nextdev:
1225                 read_unlock_bh(&idev->lock);
1226         }
1227         rcu_read_unlock();
1228
1229         if (!hiscore->ifa)
1230                 return -EADDRNOTAVAIL;
1231
1232         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1233         in6_ifa_put(hiscore->ifa);
1234         return 0;
1235 }
1236 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1237
1238 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1239                     unsigned char banned_flags)
1240 {
1241         struct inet6_dev *idev;
1242         int err = -EADDRNOTAVAIL;
1243
1244         rcu_read_lock();
1245         idev = __in6_dev_get(dev);
1246         if (idev) {
1247                 struct inet6_ifaddr *ifp;
1248
1249                 read_lock_bh(&idev->lock);
1250                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1251                         if (ifp->scope == IFA_LINK &&
1252                             !(ifp->flags & banned_flags)) {
1253                                 ipv6_addr_copy(addr, &ifp->addr);
1254                                 err = 0;
1255                                 break;
1256                         }
1257                 }
1258                 read_unlock_bh(&idev->lock);
1259         }
1260         rcu_read_unlock();
1261         return err;
1262 }
1263
1264 static int ipv6_count_addresses(struct inet6_dev *idev)
1265 {
1266         int cnt = 0;
1267         struct inet6_ifaddr *ifp;
1268
1269         read_lock_bh(&idev->lock);
1270         list_for_each_entry(ifp, &idev->addr_list, if_list)
1271                 cnt++;
1272         read_unlock_bh(&idev->lock);
1273         return cnt;
1274 }
1275
1276 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1277                   struct net_device *dev, int strict)
1278 {
1279         struct inet6_ifaddr *ifp;
1280         struct hlist_node *node;
1281         unsigned int hash = ipv6_addr_hash(addr);
1282
1283         rcu_read_lock_bh();
1284         hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1285                 if (!net_eq(dev_net(ifp->idev->dev), net))
1286                         continue;
1287                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1288                     !(ifp->flags&IFA_F_TENTATIVE) &&
1289                     (dev == NULL || ifp->idev->dev == dev ||
1290                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1291                         rcu_read_unlock_bh();
1292                         return 1;
1293                 }
1294         }
1295
1296         rcu_read_unlock_bh();
1297         return 0;
1298 }
1299 EXPORT_SYMBOL(ipv6_chk_addr);
1300
1301 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1302                                struct net_device *dev)
1303 {
1304         unsigned int hash = ipv6_addr_hash(addr);
1305         struct inet6_ifaddr *ifp;
1306         struct hlist_node *node;
1307
1308         hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1309                 if (!net_eq(dev_net(ifp->idev->dev), net))
1310                         continue;
1311                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1312                         if (dev == NULL || ifp->idev->dev == dev)
1313                                 return true;
1314                 }
1315         }
1316         return false;
1317 }
1318
1319 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1320 {
1321         struct inet6_dev *idev;
1322         struct inet6_ifaddr *ifa;
1323         int     onlink;
1324
1325         onlink = 0;
1326         rcu_read_lock();
1327         idev = __in6_dev_get(dev);
1328         if (idev) {
1329                 read_lock_bh(&idev->lock);
1330                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1331                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1332                                                    ifa->prefix_len);
1333                         if (onlink)
1334                                 break;
1335                 }
1336                 read_unlock_bh(&idev->lock);
1337         }
1338         rcu_read_unlock();
1339         return onlink;
1340 }
1341
1342 EXPORT_SYMBOL(ipv6_chk_prefix);
1343
1344 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1345                                      struct net_device *dev, int strict)
1346 {
1347         struct inet6_ifaddr *ifp, *result = NULL;
1348         unsigned int hash = ipv6_addr_hash(addr);
1349         struct hlist_node *node;
1350
1351         rcu_read_lock_bh();
1352         hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1353                 if (!net_eq(dev_net(ifp->idev->dev), net))
1354                         continue;
1355                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1356                         if (dev == NULL || ifp->idev->dev == dev ||
1357                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1358                                 result = ifp;
1359                                 in6_ifa_hold(ifp);
1360                                 break;
1361                         }
1362                 }
1363         }
1364         rcu_read_unlock_bh();
1365
1366         return result;
1367 }
1368
1369 /* Gets referenced address, destroys ifaddr */
1370
1371 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1372 {
1373         if (ifp->flags&IFA_F_PERMANENT) {
1374                 spin_lock_bh(&ifp->lock);
1375                 addrconf_del_timer(ifp);
1376                 ifp->flags |= IFA_F_TENTATIVE;
1377                 if (dad_failed)
1378                         ifp->flags |= IFA_F_DADFAILED;
1379                 spin_unlock_bh(&ifp->lock);
1380                 if (dad_failed)
1381                         ipv6_ifa_notify(0, ifp);
1382                 in6_ifa_put(ifp);
1383 #ifdef CONFIG_IPV6_PRIVACY
1384         } else if (ifp->flags&IFA_F_TEMPORARY) {
1385                 struct inet6_ifaddr *ifpub;
1386                 spin_lock_bh(&ifp->lock);
1387                 ifpub = ifp->ifpub;
1388                 if (ifpub) {
1389                         in6_ifa_hold(ifpub);
1390                         spin_unlock_bh(&ifp->lock);
1391                         ipv6_create_tempaddr(ifpub, ifp);
1392                         in6_ifa_put(ifpub);
1393                 } else {
1394                         spin_unlock_bh(&ifp->lock);
1395                 }
1396                 ipv6_del_addr(ifp);
1397 #endif
1398         } else
1399                 ipv6_del_addr(ifp);
1400 }
1401
1402 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1403 {
1404         int err = -ENOENT;
1405
1406         spin_lock(&ifp->state_lock);
1407         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1408                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1409                 err = 0;
1410         }
1411         spin_unlock(&ifp->state_lock);
1412
1413         return err;
1414 }
1415
1416 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1417 {
1418         struct inet6_dev *idev = ifp->idev;
1419
1420         if (addrconf_dad_end(ifp)) {
1421                 in6_ifa_put(ifp);
1422                 return;
1423         }
1424
1425         if (net_ratelimit())
1426                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1427                         ifp->idev->dev->name, &ifp->addr);
1428
1429         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1430                 struct in6_addr addr;
1431
1432                 addr.s6_addr32[0] = htonl(0xfe800000);
1433                 addr.s6_addr32[1] = 0;
1434
1435                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1436                     ipv6_addr_equal(&ifp->addr, &addr)) {
1437                         /* DAD failed for link-local based on MAC address */
1438                         idev->cnf.disable_ipv6 = 1;
1439
1440                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1441                                 ifp->idev->dev->name);
1442                 }
1443         }
1444
1445         addrconf_dad_stop(ifp, 1);
1446 }
1447
1448 /* Join to solicited addr multicast group. */
1449
1450 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1451 {
1452         struct in6_addr maddr;
1453
1454         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1455                 return;
1456
1457         addrconf_addr_solict_mult(addr, &maddr);
1458         ipv6_dev_mc_inc(dev, &maddr);
1459 }
1460
1461 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1462 {
1463         struct in6_addr maddr;
1464
1465         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1466                 return;
1467
1468         addrconf_addr_solict_mult(addr, &maddr);
1469         __ipv6_dev_mc_dec(idev, &maddr);
1470 }
1471
1472 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1473 {
1474         struct in6_addr addr;
1475         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1476         if (ipv6_addr_any(&addr))
1477                 return;
1478         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1479 }
1480
1481 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1482 {
1483         struct in6_addr addr;
1484         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1485         if (ipv6_addr_any(&addr))
1486                 return;
1487         __ipv6_dev_ac_dec(ifp->idev, &addr);
1488 }
1489
1490 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1491 {
1492         if (dev->addr_len != ETH_ALEN)
1493                 return -1;
1494         memcpy(eui, dev->dev_addr, 3);
1495         memcpy(eui + 5, dev->dev_addr + 3, 3);
1496
1497         /*
1498          * The zSeries OSA network cards can be shared among various
1499          * OS instances, but the OSA cards have only one MAC address.
1500          * This leads to duplicate address conflicts in conjunction
1501          * with IPv6 if more than one instance uses the same card.
1502          *
1503          * The driver for these cards can deliver a unique 16-bit
1504          * identifier for each instance sharing the same card.  It is
1505          * placed instead of 0xFFFE in the interface identifier.  The
1506          * "u" bit of the interface identifier is not inverted in this
1507          * case.  Hence the resulting interface identifier has local
1508          * scope according to RFC2373.
1509          */
1510         if (dev->dev_id) {
1511                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1512                 eui[4] = dev->dev_id & 0xFF;
1513         } else {
1514                 eui[3] = 0xFF;
1515                 eui[4] = 0xFE;
1516                 eui[0] ^= 2;
1517         }
1518         return 0;
1519 }
1520
1521 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1522 {
1523         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1524         if (dev->addr_len != ARCNET_ALEN)
1525                 return -1;
1526         memset(eui, 0, 7);
1527         eui[7] = *(u8*)dev->dev_addr;
1528         return 0;
1529 }
1530
1531 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1532 {
1533         if (dev->addr_len != INFINIBAND_ALEN)
1534                 return -1;
1535         memcpy(eui, dev->dev_addr + 12, 8);
1536         eui[0] |= 2;
1537         return 0;
1538 }
1539
1540 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1541 {
1542         if (addr == 0)
1543                 return -1;
1544         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1545                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1546                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1547                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1548                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1549                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1550         eui[1] = 0;
1551         eui[2] = 0x5E;
1552         eui[3] = 0xFE;
1553         memcpy(eui + 4, &addr, 4);
1554         return 0;
1555 }
1556
1557 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1558 {
1559         if (dev->priv_flags & IFF_ISATAP)
1560                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1561         return -1;
1562 }
1563
1564 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1565 {
1566         switch (dev->type) {
1567         case ARPHRD_ETHER:
1568         case ARPHRD_FDDI:
1569         case ARPHRD_IEEE802_TR:
1570                 return addrconf_ifid_eui48(eui, dev);
1571         case ARPHRD_ARCNET:
1572                 return addrconf_ifid_arcnet(eui, dev);
1573         case ARPHRD_INFINIBAND:
1574                 return addrconf_ifid_infiniband(eui, dev);
1575         case ARPHRD_SIT:
1576                 return addrconf_ifid_sit(eui, dev);
1577         }
1578         return -1;
1579 }
1580
1581 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1582 {
1583         int err = -1;
1584         struct inet6_ifaddr *ifp;
1585
1586         read_lock_bh(&idev->lock);
1587         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1588                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1589                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1590                         err = 0;
1591                         break;
1592                 }
1593         }
1594         read_unlock_bh(&idev->lock);
1595         return err;
1596 }
1597
1598 #ifdef CONFIG_IPV6_PRIVACY
1599 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1600 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1601 {
1602 regen:
1603         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1604         idev->rndid[0] &= ~0x02;
1605
1606         /*
1607          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1608          * check if generated address is not inappropriate
1609          *
1610          *  - Reserved subnet anycast (RFC 2526)
1611          *      11111101 11....11 1xxxxxxx
1612          *  - ISATAP (RFC4214) 6.1
1613          *      00-00-5E-FE-xx-xx-xx-xx
1614          *  - value 0
1615          *  - XXX: already assigned to an address on the device
1616          */
1617         if (idev->rndid[0] == 0xfd &&
1618             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1619             (idev->rndid[7]&0x80))
1620                 goto regen;
1621         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1622                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1623                         goto regen;
1624                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1625                         goto regen;
1626         }
1627
1628         return 0;
1629 }
1630
1631 static void ipv6_regen_rndid(unsigned long data)
1632 {
1633         struct inet6_dev *idev = (struct inet6_dev *) data;
1634         unsigned long expires;
1635
1636         rcu_read_lock_bh();
1637         write_lock_bh(&idev->lock);
1638
1639         if (idev->dead)
1640                 goto out;
1641
1642         if (__ipv6_regen_rndid(idev) < 0)
1643                 goto out;
1644
1645         expires = jiffies +
1646                 idev->cnf.temp_prefered_lft * HZ -
1647                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1648                 idev->cnf.max_desync_factor * HZ;
1649         if (time_before(expires, jiffies)) {
1650                 printk(KERN_WARNING
1651                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1652                         idev->dev->name);
1653                 goto out;
1654         }
1655
1656         if (!mod_timer(&idev->regen_timer, expires))
1657                 in6_dev_hold(idev);
1658
1659 out:
1660         write_unlock_bh(&idev->lock);
1661         rcu_read_unlock_bh();
1662         in6_dev_put(idev);
1663 }
1664
1665 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1666         int ret = 0;
1667
1668         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1669                 ret = __ipv6_regen_rndid(idev);
1670         return ret;
1671 }
1672 #endif
1673
1674 /*
1675  *      Add prefix route.
1676  */
1677
1678 static void
1679 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1680                       unsigned long expires, u32 flags)
1681 {
1682         struct fib6_config cfg = {
1683                 .fc_table = RT6_TABLE_PREFIX,
1684                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1685                 .fc_ifindex = dev->ifindex,
1686                 .fc_expires = expires,
1687                 .fc_dst_len = plen,
1688                 .fc_flags = RTF_UP | flags,
1689                 .fc_nlinfo.nl_net = dev_net(dev),
1690                 .fc_protocol = RTPROT_KERNEL,
1691         };
1692
1693         ipv6_addr_copy(&cfg.fc_dst, pfx);
1694
1695         /* Prevent useless cloning on PtP SIT.
1696            This thing is done here expecting that the whole
1697            class of non-broadcast devices need not cloning.
1698          */
1699 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1700         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1701                 cfg.fc_flags |= RTF_NONEXTHOP;
1702 #endif
1703
1704         ip6_route_add(&cfg);
1705 }
1706
1707 /* Create "default" multicast route to the interface */
1708
1709 static void addrconf_add_mroute(struct net_device *dev)
1710 {
1711         struct fib6_config cfg = {
1712                 .fc_table = RT6_TABLE_LOCAL,
1713                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1714                 .fc_ifindex = dev->ifindex,
1715                 .fc_dst_len = 8,
1716                 .fc_flags = RTF_UP,
1717                 .fc_nlinfo.nl_net = dev_net(dev),
1718         };
1719
1720         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1721
1722         ip6_route_add(&cfg);
1723 }
1724
1725 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1726 static void sit_route_add(struct net_device *dev)
1727 {
1728         struct fib6_config cfg = {
1729                 .fc_table = RT6_TABLE_MAIN,
1730                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1731                 .fc_ifindex = dev->ifindex,
1732                 .fc_dst_len = 96,
1733                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1734                 .fc_nlinfo.nl_net = dev_net(dev),
1735         };
1736
1737         /* prefix length - 96 bits "::d.d.d.d" */
1738         ip6_route_add(&cfg);
1739 }
1740 #endif
1741
1742 static void addrconf_add_lroute(struct net_device *dev)
1743 {
1744         struct in6_addr addr;
1745
1746         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1747         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1748 }
1749
1750 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1751 {
1752         struct inet6_dev *idev;
1753
1754         ASSERT_RTNL();
1755
1756         idev = ipv6_find_idev(dev);
1757         if (!idev)
1758                 return ERR_PTR(-ENOBUFS);
1759
1760         if (idev->cnf.disable_ipv6)
1761                 return ERR_PTR(-EACCES);
1762
1763         /* Add default multicast route */
1764         addrconf_add_mroute(dev);
1765
1766         /* Add link local route */
1767         addrconf_add_lroute(dev);
1768         return idev;
1769 }
1770
1771 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1772 {
1773         struct prefix_info *pinfo;
1774         __u32 valid_lft;
1775         __u32 prefered_lft;
1776         int addr_type;
1777         struct inet6_dev *in6_dev;
1778         struct net *net = dev_net(dev);
1779
1780         pinfo = (struct prefix_info *) opt;
1781
1782         if (len < sizeof(struct prefix_info)) {
1783                 ADBG(("addrconf: prefix option too short\n"));
1784                 return;
1785         }
1786
1787         /*
1788          *      Validation checks ([ADDRCONF], page 19)
1789          */
1790
1791         addr_type = ipv6_addr_type(&pinfo->prefix);
1792
1793         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1794                 return;
1795
1796         valid_lft = ntohl(pinfo->valid);
1797         prefered_lft = ntohl(pinfo->prefered);
1798
1799         if (prefered_lft > valid_lft) {
1800                 if (net_ratelimit())
1801                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1802                 return;
1803         }
1804
1805         in6_dev = in6_dev_get(dev);
1806
1807         if (in6_dev == NULL) {
1808                 if (net_ratelimit())
1809                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1810                 return;
1811         }
1812
1813         /*
1814          *      Two things going on here:
1815          *      1) Add routes for on-link prefixes
1816          *      2) Configure prefixes with the auto flag set
1817          */
1818
1819         if (pinfo->onlink) {
1820                 struct rt6_info *rt;
1821                 unsigned long rt_expires;
1822
1823                 /* Avoid arithmetic overflow. Really, we could
1824                  * save rt_expires in seconds, likely valid_lft,
1825                  * but it would require division in fib gc, that it
1826                  * not good.
1827                  */
1828                 if (HZ > USER_HZ)
1829                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1830                 else
1831                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1832
1833                 if (addrconf_finite_timeout(rt_expires))
1834                         rt_expires *= HZ;
1835
1836                 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1837                                 dev->ifindex, 1);
1838
1839                 if (rt && addrconf_is_prefix_route(rt)) {
1840                         /* Autoconf prefix route */
1841                         if (valid_lft == 0) {
1842                                 ip6_del_rt(rt);
1843                                 rt = NULL;
1844                         } else if (addrconf_finite_timeout(rt_expires)) {
1845                                 /* not infinity */
1846                                 rt->rt6i_expires = jiffies + rt_expires;
1847                                 rt->rt6i_flags |= RTF_EXPIRES;
1848                         } else {
1849                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1850                                 rt->rt6i_expires = 0;
1851                         }
1852                 } else if (valid_lft) {
1853                         clock_t expires = 0;
1854                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1855                         if (addrconf_finite_timeout(rt_expires)) {
1856                                 /* not infinity */
1857                                 flags |= RTF_EXPIRES;
1858                                 expires = jiffies_to_clock_t(rt_expires);
1859                         }
1860                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1861                                               dev, expires, flags);
1862                 }
1863                 if (rt)
1864                         dst_release(&rt->dst);
1865         }
1866
1867         /* Try to figure out our local address for this prefix */
1868
1869         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1870                 struct inet6_ifaddr * ifp;
1871                 struct in6_addr addr;
1872                 int create = 0, update_lft = 0;
1873
1874                 if (pinfo->prefix_len == 64) {
1875                         memcpy(&addr, &pinfo->prefix, 8);
1876                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1877                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1878                                 in6_dev_put(in6_dev);
1879                                 return;
1880                         }
1881                         goto ok;
1882                 }
1883                 if (net_ratelimit())
1884                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1885                                pinfo->prefix_len);
1886                 in6_dev_put(in6_dev);
1887                 return;
1888
1889 ok:
1890
1891                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1892
1893                 if (ifp == NULL && valid_lft) {
1894                         int max_addresses = in6_dev->cnf.max_addresses;
1895                         u32 addr_flags = 0;
1896
1897 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1898                         if (in6_dev->cnf.optimistic_dad &&
1899                             !net->ipv6.devconf_all->forwarding)
1900                                 addr_flags = IFA_F_OPTIMISTIC;
1901 #endif
1902
1903                         /* Do not allow to create too much of autoconfigured
1904                          * addresses; this would be too easy way to crash kernel.
1905                          */
1906                         if (!max_addresses ||
1907                             ipv6_count_addresses(in6_dev) < max_addresses)
1908                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1909                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1910                                                     addr_flags);
1911
1912                         if (!ifp || IS_ERR(ifp)) {
1913                                 in6_dev_put(in6_dev);
1914                                 return;
1915                         }
1916
1917                         update_lft = create = 1;
1918                         ifp->cstamp = jiffies;
1919                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1920                 }
1921
1922                 if (ifp) {
1923                         int flags;
1924                         unsigned long now;
1925 #ifdef CONFIG_IPV6_PRIVACY
1926                         struct inet6_ifaddr *ift;
1927 #endif
1928                         u32 stored_lft;
1929
1930                         /* update lifetime (RFC2462 5.5.3 e) */
1931                         spin_lock(&ifp->lock);
1932                         now = jiffies;
1933                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1934                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1935                         else
1936                                 stored_lft = 0;
1937                         if (!update_lft && stored_lft) {
1938                                 if (valid_lft > MIN_VALID_LIFETIME ||
1939                                     valid_lft > stored_lft)
1940                                         update_lft = 1;
1941                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1942                                         /* valid_lft <= stored_lft is always true */
1943                                         /*
1944                                          * RFC 4862 Section 5.5.3e:
1945                                          * "Note that the preferred lifetime of
1946                                          *  the corresponding address is always
1947                                          *  reset to the Preferred Lifetime in
1948                                          *  the received Prefix Information
1949                                          *  option, regardless of whether the
1950                                          *  valid lifetime is also reset or
1951                                          *  ignored."
1952                                          *
1953                                          *  So if the preferred lifetime in
1954                                          *  this advertisement is different
1955                                          *  than what we have stored, but the
1956                                          *  valid lifetime is invalid, just
1957                                          *  reset prefered_lft.
1958                                          *
1959                                          *  We must set the valid lifetime
1960                                          *  to the stored lifetime since we'll
1961                                          *  be updating the timestamp below,
1962                                          *  else we'll set it back to the
1963                                          *  minimum.
1964                                          */
1965                                         if (prefered_lft != ifp->prefered_lft) {
1966                                                 valid_lft = stored_lft;
1967                                                 update_lft = 1;
1968                                         }
1969                                 } else {
1970                                         valid_lft = MIN_VALID_LIFETIME;
1971                                         if (valid_lft < prefered_lft)
1972                                                 prefered_lft = valid_lft;
1973                                         update_lft = 1;
1974                                 }
1975                         }
1976
1977                         if (update_lft) {
1978                                 ifp->valid_lft = valid_lft;
1979                                 ifp->prefered_lft = prefered_lft;
1980                                 ifp->tstamp = now;
1981                                 flags = ifp->flags;
1982                                 ifp->flags &= ~IFA_F_DEPRECATED;
1983                                 spin_unlock(&ifp->lock);
1984
1985                                 if (!(flags&IFA_F_TENTATIVE))
1986                                         ipv6_ifa_notify(0, ifp);
1987                         } else
1988                                 spin_unlock(&ifp->lock);
1989
1990 #ifdef CONFIG_IPV6_PRIVACY
1991                         read_lock_bh(&in6_dev->lock);
1992                         /* update all temporary addresses in the list */
1993                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
1994                                             tmp_list) {
1995                                 int age, max_valid, max_prefered;
1996
1997                                 if (ifp != ift->ifpub)
1998                                         continue;
1999
2000                                 /*
2001                                  * RFC 4941 section 3.3:
2002                                  * If a received option will extend the lifetime
2003                                  * of a public address, the lifetimes of
2004                                  * temporary addresses should be extended,
2005                                  * subject to the overall constraint that no
2006                                  * temporary addresses should ever remain
2007                                  * "valid" or "preferred" for a time longer than
2008                                  * (TEMP_VALID_LIFETIME) or
2009                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2010                                  * respectively.
2011                                  */
2012                                 age = (now - ift->cstamp) / HZ;
2013                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2014                                 if (max_valid < 0)
2015                                         max_valid = 0;
2016
2017                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2018                                                in6_dev->cnf.max_desync_factor -
2019                                                age;
2020                                 if (max_prefered < 0)
2021                                         max_prefered = 0;
2022
2023                                 if (valid_lft > max_valid)
2024                                         valid_lft = max_valid;
2025
2026                                 if (prefered_lft > max_prefered)
2027                                         prefered_lft = max_prefered;
2028
2029                                 spin_lock(&ift->lock);
2030                                 flags = ift->flags;
2031                                 ift->valid_lft = valid_lft;
2032                                 ift->prefered_lft = prefered_lft;
2033                                 ift->tstamp = now;
2034                                 if (prefered_lft > 0)
2035                                         ift->flags &= ~IFA_F_DEPRECATED;
2036
2037                                 spin_unlock(&ift->lock);
2038                                 if (!(flags&IFA_F_TENTATIVE))
2039                                         ipv6_ifa_notify(0, ift);
2040                         }
2041
2042                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2043                                 /*
2044                                  * When a new public address is created as
2045                                  * described in [ADDRCONF], also create a new
2046                                  * temporary address. Also create a temporary
2047                                  * address if it's enabled but no temporary
2048                                  * address currently exists.
2049                                  */
2050                                 read_unlock_bh(&in6_dev->lock);
2051                                 ipv6_create_tempaddr(ifp, NULL);
2052                         } else {
2053                                 read_unlock_bh(&in6_dev->lock);
2054                         }
2055 #endif
2056                         in6_ifa_put(ifp);
2057                         addrconf_verify(0);
2058                 }
2059         }
2060         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2061         in6_dev_put(in6_dev);
2062 }
2063
2064 /*
2065  *      Set destination address.
2066  *      Special case for SIT interfaces where we create a new "virtual"
2067  *      device.
2068  */
2069 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2070 {
2071         struct in6_ifreq ireq;
2072         struct net_device *dev;
2073         int err = -EINVAL;
2074
2075         rtnl_lock();
2076
2077         err = -EFAULT;
2078         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2079                 goto err_exit;
2080
2081         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2082
2083         err = -ENODEV;
2084         if (dev == NULL)
2085                 goto err_exit;
2086
2087 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2088         if (dev->type == ARPHRD_SIT) {
2089                 const struct net_device_ops *ops = dev->netdev_ops;
2090                 struct ifreq ifr;
2091                 struct ip_tunnel_parm p;
2092
2093                 err = -EADDRNOTAVAIL;
2094                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2095                         goto err_exit;
2096
2097                 memset(&p, 0, sizeof(p));
2098                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2099                 p.iph.saddr = 0;
2100                 p.iph.version = 4;
2101                 p.iph.ihl = 5;
2102                 p.iph.protocol = IPPROTO_IPV6;
2103                 p.iph.ttl = 64;
2104                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2105
2106                 if (ops->ndo_do_ioctl) {
2107                         mm_segment_t oldfs = get_fs();
2108
2109                         set_fs(KERNEL_DS);
2110                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2111                         set_fs(oldfs);
2112                 } else
2113                         err = -EOPNOTSUPP;
2114
2115                 if (err == 0) {
2116                         err = -ENOBUFS;
2117                         dev = __dev_get_by_name(net, p.name);
2118                         if (!dev)
2119                                 goto err_exit;
2120                         err = dev_open(dev);
2121                 }
2122         }
2123 #endif
2124
2125 err_exit:
2126         rtnl_unlock();
2127         return err;
2128 }
2129
2130 /*
2131  *      Manual configuration of address on an interface
2132  */
2133 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2134                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2135                           __u32 valid_lft)
2136 {
2137         struct inet6_ifaddr *ifp;
2138         struct inet6_dev *idev;
2139         struct net_device *dev;
2140         int scope;
2141         u32 flags;
2142         clock_t expires;
2143         unsigned long timeout;
2144
2145         ASSERT_RTNL();
2146
2147         if (plen > 128)
2148                 return -EINVAL;
2149
2150         /* check the lifetime */
2151         if (!valid_lft || prefered_lft > valid_lft)
2152                 return -EINVAL;
2153
2154         dev = __dev_get_by_index(net, ifindex);
2155         if (!dev)
2156                 return -ENODEV;
2157
2158         idev = addrconf_add_dev(dev);
2159         if (IS_ERR(idev))
2160                 return PTR_ERR(idev);
2161
2162         scope = ipv6_addr_scope(pfx);
2163
2164         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2165         if (addrconf_finite_timeout(timeout)) {
2166                 expires = jiffies_to_clock_t(timeout * HZ);
2167                 valid_lft = timeout;
2168                 flags = RTF_EXPIRES;
2169         } else {
2170                 expires = 0;
2171                 flags = 0;
2172                 ifa_flags |= IFA_F_PERMANENT;
2173         }
2174
2175         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2176         if (addrconf_finite_timeout(timeout)) {
2177                 if (timeout == 0)
2178                         ifa_flags |= IFA_F_DEPRECATED;
2179                 prefered_lft = timeout;
2180         }
2181
2182         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2183
2184         if (!IS_ERR(ifp)) {
2185                 spin_lock_bh(&ifp->lock);
2186                 ifp->valid_lft = valid_lft;
2187                 ifp->prefered_lft = prefered_lft;
2188                 ifp->tstamp = jiffies;
2189                 spin_unlock_bh(&ifp->lock);
2190
2191                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2192                                       expires, flags);
2193                 /*
2194                  * Note that section 3.1 of RFC 4429 indicates
2195                  * that the Optimistic flag should not be set for
2196                  * manually configured addresses
2197                  */
2198                 addrconf_dad_start(ifp, 0);
2199                 in6_ifa_put(ifp);
2200                 addrconf_verify(0);
2201                 return 0;
2202         }
2203
2204         return PTR_ERR(ifp);
2205 }
2206
2207 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2208                           unsigned int plen)
2209 {
2210         struct inet6_ifaddr *ifp;
2211         struct inet6_dev *idev;
2212         struct net_device *dev;
2213
2214         if (plen > 128)
2215                 return -EINVAL;
2216
2217         dev = __dev_get_by_index(net, ifindex);
2218         if (!dev)
2219                 return -ENODEV;
2220
2221         if ((idev = __in6_dev_get(dev)) == NULL)
2222                 return -ENXIO;
2223
2224         read_lock_bh(&idev->lock);
2225         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2226                 if (ifp->prefix_len == plen &&
2227                     ipv6_addr_equal(pfx, &ifp->addr)) {
2228                         in6_ifa_hold(ifp);
2229                         read_unlock_bh(&idev->lock);
2230
2231                         ipv6_del_addr(ifp);
2232
2233                         /* If the last address is deleted administratively,
2234                            disable IPv6 on this interface.
2235                          */
2236                         if (list_empty(&idev->addr_list))
2237                                 addrconf_ifdown(idev->dev, 1);
2238                         return 0;
2239                 }
2240         }
2241         read_unlock_bh(&idev->lock);
2242         return -EADDRNOTAVAIL;
2243 }
2244
2245
2246 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2247 {
2248         struct in6_ifreq ireq;
2249         int err;
2250
2251         if (!capable(CAP_NET_ADMIN))
2252                 return -EPERM;
2253
2254         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2255                 return -EFAULT;
2256
2257         rtnl_lock();
2258         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2259                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2260                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2261         rtnl_unlock();
2262         return err;
2263 }
2264
2265 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2266 {
2267         struct in6_ifreq ireq;
2268         int err;
2269
2270         if (!capable(CAP_NET_ADMIN))
2271                 return -EPERM;
2272
2273         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2274                 return -EFAULT;
2275
2276         rtnl_lock();
2277         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2278                              ireq.ifr6_prefixlen);
2279         rtnl_unlock();
2280         return err;
2281 }
2282
2283 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2284                      int plen, int scope)
2285 {
2286         struct inet6_ifaddr *ifp;
2287
2288         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2289         if (!IS_ERR(ifp)) {
2290                 spin_lock_bh(&ifp->lock);
2291                 ifp->flags &= ~IFA_F_TENTATIVE;
2292                 spin_unlock_bh(&ifp->lock);
2293                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2294                 in6_ifa_put(ifp);
2295         }
2296 }
2297
2298 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2299 static void sit_add_v4_addrs(struct inet6_dev *idev)
2300 {
2301         struct in6_addr addr;
2302         struct net_device *dev;
2303         struct net *net = dev_net(idev->dev);
2304         int scope;
2305
2306         ASSERT_RTNL();
2307
2308         memset(&addr, 0, sizeof(struct in6_addr));
2309         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2310
2311         if (idev->dev->flags&IFF_POINTOPOINT) {
2312                 addr.s6_addr32[0] = htonl(0xfe800000);
2313                 scope = IFA_LINK;
2314         } else {
2315                 scope = IPV6_ADDR_COMPATv4;
2316         }
2317
2318         if (addr.s6_addr32[3]) {
2319                 add_addr(idev, &addr, 128, scope);
2320                 return;
2321         }
2322
2323         for_each_netdev(net, dev) {
2324                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2325                 if (in_dev && (dev->flags & IFF_UP)) {
2326                         struct in_ifaddr * ifa;
2327
2328                         int flag = scope;
2329
2330                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2331                                 int plen;
2332
2333                                 addr.s6_addr32[3] = ifa->ifa_local;
2334
2335                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2336                                         continue;
2337                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2338                                         if (idev->dev->flags&IFF_POINTOPOINT)
2339                                                 continue;
2340                                         flag |= IFA_HOST;
2341                                 }
2342                                 if (idev->dev->flags&IFF_POINTOPOINT)
2343                                         plen = 64;
2344                                 else
2345                                         plen = 96;
2346
2347                                 add_addr(idev, &addr, plen, flag);
2348                         }
2349                 }
2350         }
2351 }
2352 #endif
2353
2354 static void init_loopback(struct net_device *dev)
2355 {
2356         struct inet6_dev  *idev;
2357
2358         /* ::1 */
2359
2360         ASSERT_RTNL();
2361
2362         if ((idev = ipv6_find_idev(dev)) == NULL) {
2363                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2364                 return;
2365         }
2366
2367         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2368 }
2369
2370 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2371 {
2372         struct inet6_ifaddr * ifp;
2373         u32 addr_flags = IFA_F_PERMANENT;
2374
2375 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2376         if (idev->cnf.optimistic_dad &&
2377             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2378                 addr_flags |= IFA_F_OPTIMISTIC;
2379 #endif
2380
2381
2382         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2383         if (!IS_ERR(ifp)) {
2384                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2385                 addrconf_dad_start(ifp, 0);
2386                 in6_ifa_put(ifp);
2387         }
2388 }
2389
2390 static void addrconf_dev_config(struct net_device *dev)
2391 {
2392         struct in6_addr addr;
2393         struct inet6_dev    * idev;
2394
2395         ASSERT_RTNL();
2396
2397         if ((dev->type != ARPHRD_ETHER) &&
2398             (dev->type != ARPHRD_FDDI) &&
2399             (dev->type != ARPHRD_IEEE802_TR) &&
2400             (dev->type != ARPHRD_ARCNET) &&
2401             (dev->type != ARPHRD_INFINIBAND)) {
2402                 /* Alas, we support only Ethernet autoconfiguration. */
2403                 return;
2404         }
2405
2406         idev = addrconf_add_dev(dev);
2407         if (IS_ERR(idev))
2408                 return;
2409
2410         memset(&addr, 0, sizeof(struct in6_addr));
2411         addr.s6_addr32[0] = htonl(0xFE800000);
2412
2413         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2414                 addrconf_add_linklocal(idev, &addr);
2415 }
2416
2417 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2418 static void addrconf_sit_config(struct net_device *dev)
2419 {
2420         struct inet6_dev *idev;
2421
2422         ASSERT_RTNL();
2423
2424         /*
2425          * Configure the tunnel with one of our IPv4
2426          * addresses... we should configure all of
2427          * our v4 addrs in the tunnel
2428          */
2429
2430         if ((idev = ipv6_find_idev(dev)) == NULL) {
2431                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2432                 return;
2433         }
2434
2435         if (dev->priv_flags & IFF_ISATAP) {
2436                 struct in6_addr addr;
2437
2438                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2439                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2440                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2441                         addrconf_add_linklocal(idev, &addr);
2442                 return;
2443         }
2444
2445         sit_add_v4_addrs(idev);
2446
2447         if (dev->flags&IFF_POINTOPOINT) {
2448                 addrconf_add_mroute(dev);
2449                 addrconf_add_lroute(dev);
2450         } else
2451                 sit_route_add(dev);
2452 }
2453 #endif
2454
2455 static inline int
2456 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2457 {
2458         struct in6_addr lladdr;
2459
2460         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2461                 addrconf_add_linklocal(idev, &lladdr);
2462                 return 0;
2463         }
2464         return -1;
2465 }
2466
2467 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2468 {
2469         struct net_device *link_dev;
2470         struct net *net = dev_net(idev->dev);
2471
2472         /* first try to inherit the link-local address from the link device */
2473         if (idev->dev->iflink &&
2474             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2475                 if (!ipv6_inherit_linklocal(idev, link_dev))
2476                         return;
2477         }
2478         /* then try to inherit it from any device */
2479         for_each_netdev(net, link_dev) {
2480                 if (!ipv6_inherit_linklocal(idev, link_dev))
2481                         return;
2482         }
2483         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2484 }
2485
2486 /*
2487  * Autoconfigure tunnel with a link-local address so routing protocols,
2488  * DHCPv6, MLD etc. can be run over the virtual link
2489  */
2490
2491 static void addrconf_ip6_tnl_config(struct net_device *dev)
2492 {
2493         struct inet6_dev *idev;
2494
2495         ASSERT_RTNL();
2496
2497         idev = addrconf_add_dev(dev);
2498         if (IS_ERR(idev)) {
2499                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2500                 return;
2501         }
2502         ip6_tnl_add_linklocal(idev);
2503 }
2504
2505 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2506                            void * data)
2507 {
2508         struct net_device *dev = (struct net_device *) data;
2509         struct inet6_dev *idev = __in6_dev_get(dev);
2510         int run_pending = 0;
2511         int err;
2512
2513         switch (event) {
2514         case NETDEV_REGISTER:
2515                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2516                         idev = ipv6_add_dev(dev);
2517                         if (!idev)
2518                                 return notifier_from_errno(-ENOMEM);
2519                 }
2520                 break;
2521
2522         case NETDEV_UP:
2523         case NETDEV_CHANGE:
2524                 if (dev->flags & IFF_SLAVE)
2525                         break;
2526
2527                 if (event == NETDEV_UP) {
2528                         if (!addrconf_qdisc_ok(dev)) {
2529                                 /* device is not ready yet. */
2530                                 printk(KERN_INFO
2531                                         "ADDRCONF(NETDEV_UP): %s: "
2532                                         "link is not ready\n",
2533                                         dev->name);
2534                                 break;
2535                         }
2536
2537                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2538                                 idev = ipv6_add_dev(dev);
2539
2540                         if (idev) {
2541                                 idev->if_flags |= IF_READY;
2542                                 run_pending = 1;
2543                         }
2544                 } else {
2545                         if (!addrconf_qdisc_ok(dev)) {
2546                                 /* device is still not ready. */
2547                                 break;
2548                         }
2549
2550                         if (idev) {
2551                                 if (idev->if_flags & IF_READY)
2552                                         /* device is already configured. */
2553                                         break;
2554                                 idev->if_flags |= IF_READY;
2555                         }
2556
2557                         printk(KERN_INFO
2558                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2559                                         "link becomes ready\n",
2560                                         dev->name);
2561
2562                         run_pending = 1;
2563                 }
2564
2565                 switch (dev->type) {
2566 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2567                 case ARPHRD_SIT:
2568                         addrconf_sit_config(dev);
2569                         break;
2570 #endif
2571                 case ARPHRD_TUNNEL6:
2572                         addrconf_ip6_tnl_config(dev);
2573                         break;
2574                 case ARPHRD_LOOPBACK:
2575                         init_loopback(dev);
2576                         break;
2577
2578                 default:
2579                         addrconf_dev_config(dev);
2580                         break;
2581                 }
2582
2583                 if (idev) {
2584                         if (run_pending)
2585                                 addrconf_dad_run(idev);
2586
2587                         /*
2588                          * If the MTU changed during the interface down,
2589                          * when the interface up, the changed MTU must be
2590                          * reflected in the idev as well as routers.
2591                          */
2592                         if (idev->cnf.mtu6 != dev->mtu &&
2593                             dev->mtu >= IPV6_MIN_MTU) {
2594                                 rt6_mtu_change(dev, dev->mtu);
2595                                 idev->cnf.mtu6 = dev->mtu;
2596                         }
2597                         idev->tstamp = jiffies;
2598                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2599
2600                         /*
2601                          * If the changed mtu during down is lower than
2602                          * IPV6_MIN_MTU stop IPv6 on this interface.
2603                          */
2604                         if (dev->mtu < IPV6_MIN_MTU)
2605                                 addrconf_ifdown(dev, 1);
2606                 }
2607                 break;
2608
2609         case NETDEV_CHANGEMTU:
2610                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2611                         rt6_mtu_change(dev, dev->mtu);
2612                         idev->cnf.mtu6 = dev->mtu;
2613                         break;
2614                 }
2615
2616                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2617                         idev = ipv6_add_dev(dev);
2618                         if (idev)
2619                                 break;
2620                 }
2621
2622                 /*
2623                  * MTU falled under IPV6_MIN_MTU.
2624                  * Stop IPv6 on this interface.
2625                  */
2626
2627         case NETDEV_DOWN:
2628         case NETDEV_UNREGISTER:
2629                 /*
2630                  *      Remove all addresses from this interface.
2631                  */
2632                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2633                 break;
2634
2635         case NETDEV_CHANGENAME:
2636                 if (idev) {
2637                         snmp6_unregister_dev(idev);
2638                         addrconf_sysctl_unregister(idev);
2639                         addrconf_sysctl_register(idev);
2640                         err = snmp6_register_dev(idev);
2641                         if (err)
2642                                 return notifier_from_errno(err);
2643                 }
2644                 break;
2645
2646         case NETDEV_PRE_TYPE_CHANGE:
2647         case NETDEV_POST_TYPE_CHANGE:
2648                 addrconf_type_change(dev, event);
2649                 break;
2650         }
2651
2652         return NOTIFY_OK;
2653 }
2654
2655 /*
2656  *      addrconf module should be notified of a device going up
2657  */
2658 static struct notifier_block ipv6_dev_notf = {
2659         .notifier_call = addrconf_notify,
2660 };
2661
2662 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2663 {
2664         struct inet6_dev *idev;
2665         ASSERT_RTNL();
2666
2667         idev = __in6_dev_get(dev);
2668
2669         if (event == NETDEV_POST_TYPE_CHANGE)
2670                 ipv6_mc_remap(idev);
2671         else if (event == NETDEV_PRE_TYPE_CHANGE)
2672                 ipv6_mc_unmap(idev);
2673 }
2674
2675 static int addrconf_ifdown(struct net_device *dev, int how)
2676 {
2677         struct net *net = dev_net(dev);
2678         struct inet6_dev *idev;
2679         struct inet6_ifaddr *ifa;
2680         int state, i;
2681
2682         ASSERT_RTNL();
2683
2684         rt6_ifdown(net, dev);
2685         neigh_ifdown(&nd_tbl, dev);
2686
2687         idev = __in6_dev_get(dev);
2688         if (idev == NULL)
2689                 return -ENODEV;
2690
2691         /*
2692          * Step 1: remove reference to ipv6 device from parent device.
2693          *         Do not dev_put!
2694          */
2695         if (how) {
2696                 idev->dead = 1;
2697
2698                 /* protected by rtnl_lock */
2699                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2700
2701                 /* Step 1.5: remove snmp6 entry */
2702                 snmp6_unregister_dev(idev);
2703
2704         }
2705
2706         /* Step 2: clear hash table */
2707         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2708                 struct hlist_head *h = &inet6_addr_lst[i];
2709                 struct hlist_node *n;
2710
2711                 spin_lock_bh(&addrconf_hash_lock);
2712         restart:
2713                 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2714                         if (ifa->idev == idev) {
2715                                 hlist_del_init_rcu(&ifa->addr_lst);
2716                                 addrconf_del_timer(ifa);
2717                                 goto restart;
2718                         }
2719                 }
2720                 spin_unlock_bh(&addrconf_hash_lock);
2721         }
2722
2723         write_lock_bh(&idev->lock);
2724
2725         /* Step 2: clear flags for stateless addrconf */
2726         if (!how)
2727                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2728
2729 #ifdef CONFIG_IPV6_PRIVACY
2730         if (how && del_timer(&idev->regen_timer))
2731                 in6_dev_put(idev);
2732
2733         /* Step 3: clear tempaddr list */
2734         while (!list_empty(&idev->tempaddr_list)) {
2735                 ifa = list_first_entry(&idev->tempaddr_list,
2736                                        struct inet6_ifaddr, tmp_list);
2737                 list_del(&ifa->tmp_list);
2738                 write_unlock_bh(&idev->lock);
2739                 spin_lock_bh(&ifa->lock);
2740
2741                 if (ifa->ifpub) {
2742                         in6_ifa_put(ifa->ifpub);
2743                         ifa->ifpub = NULL;
2744                 }
2745                 spin_unlock_bh(&ifa->lock);
2746                 in6_ifa_put(ifa);
2747                 write_lock_bh(&idev->lock);
2748         }
2749 #endif
2750
2751         while (!list_empty(&idev->addr_list)) {
2752                 ifa = list_first_entry(&idev->addr_list,
2753                                        struct inet6_ifaddr, if_list);
2754                 addrconf_del_timer(ifa);
2755
2756                 list_del(&ifa->if_list);
2757
2758                 write_unlock_bh(&idev->lock);
2759
2760                 spin_lock_bh(&ifa->state_lock);
2761                 state = ifa->state;
2762                 ifa->state = INET6_IFADDR_STATE_DEAD;
2763                 spin_unlock_bh(&ifa->state_lock);
2764
2765                 if (state != INET6_IFADDR_STATE_DEAD) {
2766                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
2767                         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2768                 }
2769                 in6_ifa_put(ifa);
2770
2771                 write_lock_bh(&idev->lock);
2772         }
2773
2774         write_unlock_bh(&idev->lock);
2775
2776         /* Step 5: Discard multicast list */
2777         if (how)
2778                 ipv6_mc_destroy_dev(idev);
2779         else
2780                 ipv6_mc_down(idev);
2781
2782         idev->tstamp = jiffies;
2783
2784         /* Last: Shot the device (if unregistered) */
2785         if (how) {
2786                 addrconf_sysctl_unregister(idev);
2787                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2788                 neigh_ifdown(&nd_tbl, dev);
2789                 in6_dev_put(idev);
2790         }
2791         return 0;
2792 }
2793
2794 static void addrconf_rs_timer(unsigned long data)
2795 {
2796         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2797         struct inet6_dev *idev = ifp->idev;
2798
2799         read_lock(&idev->lock);
2800         if (idev->dead || !(idev->if_flags & IF_READY))
2801                 goto out;
2802
2803         if (idev->cnf.forwarding)
2804                 goto out;
2805
2806         /* Announcement received after solicitation was sent */
2807         if (idev->if_flags & IF_RA_RCVD)
2808                 goto out;
2809
2810         spin_lock(&ifp->lock);
2811         if (ifp->probes++ < idev->cnf.rtr_solicits) {
2812                 /* The wait after the last probe can be shorter */
2813                 addrconf_mod_timer(ifp, AC_RS,
2814                                    (ifp->probes == idev->cnf.rtr_solicits) ?
2815                                    idev->cnf.rtr_solicit_delay :
2816                                    idev->cnf.rtr_solicit_interval);
2817                 spin_unlock(&ifp->lock);
2818
2819                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2820         } else {
2821                 spin_unlock(&ifp->lock);
2822                 /*
2823                  * Note: we do not support deprecated "all on-link"
2824                  * assumption any longer.
2825                  */
2826                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2827                        idev->dev->name);
2828         }
2829
2830 out:
2831         read_unlock(&idev->lock);
2832         in6_ifa_put(ifp);
2833 }
2834
2835 /*
2836  *      Duplicate Address Detection
2837  */
2838 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2839 {
2840         unsigned long rand_num;
2841         struct inet6_dev *idev = ifp->idev;
2842
2843         if (ifp->flags & IFA_F_OPTIMISTIC)
2844                 rand_num = 0;
2845         else
2846                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2847
2848         ifp->probes = idev->cnf.dad_transmits;
2849         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2850 }
2851
2852 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2853 {
2854         struct inet6_dev *idev = ifp->idev;
2855         struct net_device *dev = idev->dev;
2856
2857         addrconf_join_solict(dev, &ifp->addr);
2858
2859         net_srandom(ifp->addr.s6_addr32[3]);
2860
2861         read_lock_bh(&idev->lock);
2862         spin_lock(&ifp->lock);
2863         if (ifp->state == INET6_IFADDR_STATE_DEAD)
2864                 goto out;
2865
2866         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2867             idev->cnf.accept_dad < 1 ||
2868             !(ifp->flags&IFA_F_TENTATIVE) ||
2869             ifp->flags & IFA_F_NODAD) {
2870                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2871                 spin_unlock(&ifp->lock);
2872                 read_unlock_bh(&idev->lock);
2873
2874                 addrconf_dad_completed(ifp);
2875                 return;
2876         }
2877
2878         if (!(idev->if_flags & IF_READY)) {
2879                 spin_unlock(&ifp->lock);
2880                 read_unlock_bh(&idev->lock);
2881                 /*
2882                  * If the device is not ready:
2883                  * - keep it tentative if it is a permanent address.
2884                  * - otherwise, kill it.
2885                  */
2886                 in6_ifa_hold(ifp);
2887                 addrconf_dad_stop(ifp, 0);
2888                 return;
2889         }
2890
2891         /*
2892          * Optimistic nodes can start receiving
2893          * Frames right away
2894          */
2895         if (ifp->flags & IFA_F_OPTIMISTIC)
2896                 ip6_ins_rt(ifp->rt);
2897
2898         addrconf_dad_kick(ifp);
2899 out:
2900         spin_unlock(&ifp->lock);
2901         read_unlock_bh(&idev->lock);
2902 }
2903
2904 static void addrconf_dad_timer(unsigned long data)
2905 {
2906         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2907         struct inet6_dev *idev = ifp->idev;
2908         struct in6_addr mcaddr;
2909
2910         if (!ifp->probes && addrconf_dad_end(ifp))
2911                 goto out;
2912
2913         read_lock(&idev->lock);
2914         if (idev->dead || !(idev->if_flags & IF_READY)) {
2915                 read_unlock(&idev->lock);
2916                 goto out;
2917         }
2918
2919         spin_lock(&ifp->lock);
2920         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2921                 spin_unlock(&ifp->lock);
2922                 read_unlock(&idev->lock);
2923                 goto out;
2924         }
2925
2926         if (ifp->probes == 0) {
2927                 /*
2928                  * DAD was successful
2929                  */
2930
2931                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2932                 spin_unlock(&ifp->lock);
2933                 read_unlock(&idev->lock);
2934
2935                 addrconf_dad_completed(ifp);
2936
2937                 goto out;
2938         }
2939
2940         ifp->probes--;
2941         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2942         spin_unlock(&ifp->lock);
2943         read_unlock(&idev->lock);
2944
2945         /* send a neighbour solicitation for our addr */
2946         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2947         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2948 out:
2949         in6_ifa_put(ifp);
2950 }
2951
2952 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2953 {
2954         struct net_device *dev = ifp->idev->dev;
2955
2956         /*
2957          *      Configure the address for reception. Now it is valid.
2958          */
2959
2960         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2961
2962         /* If added prefix is link local and forwarding is off,
2963            start sending router solicitations.
2964          */
2965
2966         if ((ifp->idev->cnf.forwarding == 0 ||
2967              ifp->idev->cnf.forwarding == 2) &&
2968             ifp->idev->cnf.rtr_solicits > 0 &&
2969             (dev->flags&IFF_LOOPBACK) == 0 &&
2970             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2971                 /*
2972                  *      If a host as already performed a random delay
2973                  *      [...] as part of DAD [...] there is no need
2974                  *      to delay again before sending the first RS
2975                  */
2976                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2977
2978                 spin_lock_bh(&ifp->lock);
2979                 ifp->probes = 1;
2980                 ifp->idev->if_flags |= IF_RS_SENT;
2981                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2982                 spin_unlock_bh(&ifp->lock);
2983         }
2984 }
2985
2986 static void addrconf_dad_run(struct inet6_dev *idev)
2987 {
2988         struct inet6_ifaddr *ifp;
2989
2990         read_lock_bh(&idev->lock);
2991         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2992                 spin_lock(&ifp->lock);
2993                 if (ifp->flags & IFA_F_TENTATIVE &&
2994                     ifp->state == INET6_IFADDR_STATE_DAD)
2995                         addrconf_dad_kick(ifp);
2996                 spin_unlock(&ifp->lock);
2997         }
2998         read_unlock_bh(&idev->lock);
2999 }
3000
3001 #ifdef CONFIG_PROC_FS
3002 struct if6_iter_state {
3003         struct seq_net_private p;
3004         int bucket;
3005 };
3006
3007 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3008 {
3009         struct inet6_ifaddr *ifa = NULL;
3010         struct if6_iter_state *state = seq->private;
3011         struct net *net = seq_file_net(seq);
3012
3013         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3014                 struct hlist_node *n;
3015                 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3016                                          addr_lst)
3017                         if (net_eq(dev_net(ifa->idev->dev), net))
3018                                 return ifa;
3019         }
3020         return NULL;
3021 }
3022
3023 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3024                                          struct inet6_ifaddr *ifa)
3025 {
3026         struct if6_iter_state *state = seq->private;
3027         struct net *net = seq_file_net(seq);
3028         struct hlist_node *n = &ifa->addr_lst;
3029
3030         hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3031                 if (net_eq(dev_net(ifa->idev->dev), net))
3032                         return ifa;
3033
3034         while (++state->bucket < IN6_ADDR_HSIZE) {
3035                 hlist_for_each_entry_rcu_bh(ifa, n,
3036                                      &inet6_addr_lst[state->bucket], addr_lst) {
3037                         if (net_eq(dev_net(ifa->idev->dev), net))
3038                                 return ifa;
3039                 }
3040         }
3041
3042         return NULL;
3043 }
3044
3045 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3046 {
3047         struct inet6_ifaddr *ifa = if6_get_first(seq);
3048
3049         if (ifa)
3050                 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3051                         --pos;
3052         return pos ? NULL : ifa;
3053 }
3054
3055 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3056         __acquires(rcu_bh)
3057 {
3058         rcu_read_lock_bh();
3059         return if6_get_idx(seq, *pos);
3060 }
3061
3062 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3063 {
3064         struct inet6_ifaddr *ifa;
3065
3066         ifa = if6_get_next(seq, v);
3067         ++*pos;
3068         return ifa;
3069 }
3070
3071 static void if6_seq_stop(struct seq_file *seq, void *v)
3072         __releases(rcu_bh)
3073 {
3074         rcu_read_unlock_bh();
3075 }
3076
3077 static int if6_seq_show(struct seq_file *seq, void *v)
3078 {
3079         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3080         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3081                    &ifp->addr,
3082                    ifp->idev->dev->ifindex,
3083                    ifp->prefix_len,
3084                    ifp->scope,
3085                    ifp->flags,
3086                    ifp->idev->dev->name);
3087         return 0;
3088 }
3089
3090 static const struct seq_operations if6_seq_ops = {
3091         .start  = if6_seq_start,
3092         .next   = if6_seq_next,
3093         .show   = if6_seq_show,
3094         .stop   = if6_seq_stop,
3095 };
3096
3097 static int if6_seq_open(struct inode *inode, struct file *file)
3098 {
3099         return seq_open_net(inode, file, &if6_seq_ops,
3100                             sizeof(struct if6_iter_state));
3101 }
3102
3103 static const struct file_operations if6_fops = {
3104         .owner          = THIS_MODULE,
3105         .open           = if6_seq_open,
3106         .read           = seq_read,
3107         .llseek         = seq_lseek,
3108         .release        = seq_release_net,
3109 };
3110
3111 static int __net_init if6_proc_net_init(struct net *net)
3112 {
3113         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3114                 return -ENOMEM;
3115         return 0;
3116 }
3117
3118 static void __net_exit if6_proc_net_exit(struct net *net)
3119 {
3120        proc_net_remove(net, "if_inet6");
3121 }
3122
3123 static struct pernet_operations if6_proc_net_ops = {
3124        .init = if6_proc_net_init,
3125        .exit = if6_proc_net_exit,
3126 };
3127
3128 int __init if6_proc_init(void)
3129 {
3130         return register_pernet_subsys(&if6_proc_net_ops);
3131 }
3132
3133 void if6_proc_exit(void)
3134 {
3135         unregister_pernet_subsys(&if6_proc_net_ops);
3136 }
3137 #endif  /* CONFIG_PROC_FS */
3138
3139 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3140 /* Check if address is a home address configured on any interface. */
3141 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3142 {
3143         int ret = 0;
3144         struct inet6_ifaddr *ifp = NULL;
3145         struct hlist_node *n;
3146         unsigned int hash = ipv6_addr_hash(addr);
3147
3148         rcu_read_lock_bh();
3149         hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3150                 if (!net_eq(dev_net(ifp->idev->dev), net))
3151                         continue;
3152                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3153                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3154                         ret = 1;
3155                         break;
3156                 }
3157         }
3158         rcu_read_unlock_bh();
3159         return ret;
3160 }
3161 #endif
3162
3163 /*
3164  *      Periodic address status verification
3165  */
3166
3167 static void addrconf_verify(unsigned long foo)
3168 {
3169         unsigned long now, next, next_sec, next_sched;
3170         struct inet6_ifaddr *ifp;
3171         struct hlist_node *node;
3172         int i;
3173
3174         rcu_read_lock_bh();
3175         spin_lock(&addrconf_verify_lock);
3176         now = jiffies;
3177         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3178
3179         del_timer(&addr_chk_timer);
3180
3181         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3182 restart:
3183                 hlist_for_each_entry_rcu_bh(ifp, node,
3184                                          &inet6_addr_lst[i], addr_lst) {
3185                         unsigned long age;
3186
3187                         if (ifp->flags & IFA_F_PERMANENT)
3188                                 continue;
3189
3190                         spin_lock(&ifp->lock);
3191                         /* We try to batch several events at once. */
3192                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3193
3194                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3195                             age >= ifp->valid_lft) {
3196                                 spin_unlock(&ifp->lock);
3197                                 in6_ifa_hold(ifp);
3198                                 ipv6_del_addr(ifp);
3199                                 goto restart;
3200                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3201                                 spin_unlock(&ifp->lock);
3202                                 continue;
3203                         } else if (age >= ifp->prefered_lft) {
3204                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3205                                 int deprecate = 0;
3206
3207                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3208                                         deprecate = 1;
3209                                         ifp->flags |= IFA_F_DEPRECATED;
3210                                 }
3211
3212                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3213                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3214
3215                                 spin_unlock(&ifp->lock);
3216
3217                                 if (deprecate) {
3218                                         in6_ifa_hold(ifp);
3219
3220                                         ipv6_ifa_notify(0, ifp);
3221                                         in6_ifa_put(ifp);
3222                                         goto restart;
3223                                 }
3224 #ifdef CONFIG_IPV6_PRIVACY
3225                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3226                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3227                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3228                                         ifp->idev->cnf.dad_transmits *
3229                                         ifp->idev->nd_parms->retrans_time / HZ;
3230
3231                                 if (age >= ifp->prefered_lft - regen_advance) {
3232                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3233                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3234                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3235                                         if (!ifp->regen_count && ifpub) {
3236                                                 ifp->regen_count++;
3237                                                 in6_ifa_hold(ifp);
3238                                                 in6_ifa_hold(ifpub);
3239                                                 spin_unlock(&ifp->lock);
3240
3241                                                 spin_lock(&ifpub->lock);
3242                                                 ifpub->regen_count = 0;
3243                                                 spin_unlock(&ifpub->lock);
3244                                                 ipv6_create_tempaddr(ifpub, ifp);
3245                                                 in6_ifa_put(ifpub);
3246                                                 in6_ifa_put(ifp);
3247                                                 goto restart;
3248                                         }
3249                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3250                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3251                                 spin_unlock(&ifp->lock);
3252 #endif
3253                         } else {
3254                                 /* ifp->prefered_lft <= ifp->valid_lft */
3255                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3256                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3257                                 spin_unlock(&ifp->lock);
3258                         }
3259                 }
3260         }
3261
3262         next_sec = round_jiffies_up(next);
3263         next_sched = next;
3264
3265         /* If rounded timeout is accurate enough, accept it. */
3266         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3267                 next_sched = next_sec;
3268
3269         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3270         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3271                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3272
3273         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3274               now, next, next_sec, next_sched));
3275
3276         addr_chk_timer.expires = next_sched;
3277         add_timer(&addr_chk_timer);
3278         spin_unlock(&addrconf_verify_lock);
3279         rcu_read_unlock_bh();
3280 }
3281
3282 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3283 {
3284         struct in6_addr *pfx = NULL;
3285
3286         if (addr)
3287                 pfx = nla_data(addr);
3288
3289         if (local) {
3290                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3291                         pfx = NULL;
3292                 else
3293                         pfx = nla_data(local);
3294         }
3295
3296         return pfx;
3297 }
3298
3299 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3300         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3301         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3302         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3303 };
3304
3305 static int
3306 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3307 {
3308         struct net *net = sock_net(skb->sk);
3309         struct ifaddrmsg *ifm;
3310         struct nlattr *tb[IFA_MAX+1];
3311         struct in6_addr *pfx;
3312         int err;
3313
3314         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3315         if (err < 0)
3316                 return err;
3317
3318         ifm = nlmsg_data(nlh);
3319         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3320         if (pfx == NULL)
3321                 return -EINVAL;
3322
3323         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3324 }
3325
3326 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3327                              u32 prefered_lft, u32 valid_lft)
3328 {
3329         u32 flags;
3330         clock_t expires;
3331         unsigned long timeout;
3332
3333         if (!valid_lft || (prefered_lft > valid_lft))
3334                 return -EINVAL;
3335
3336         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3337         if (addrconf_finite_timeout(timeout)) {
3338                 expires = jiffies_to_clock_t(timeout * HZ);
3339                 valid_lft = timeout;
3340                 flags = RTF_EXPIRES;
3341         } else {
3342                 expires = 0;
3343                 flags = 0;
3344                 ifa_flags |= IFA_F_PERMANENT;
3345         }
3346
3347         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3348         if (addrconf_finite_timeout(timeout)) {
3349                 if (timeout == 0)
3350                         ifa_flags |= IFA_F_DEPRECATED;
3351                 prefered_lft = timeout;
3352         }
3353
3354         spin_lock_bh(&ifp->lock);
3355         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3356         ifp->tstamp = jiffies;
3357         ifp->valid_lft = valid_lft;
3358         ifp->prefered_lft = prefered_lft;
3359
3360         spin_unlock_bh(&ifp->lock);
3361         if (!(ifp->flags&IFA_F_TENTATIVE))
3362                 ipv6_ifa_notify(0, ifp);
3363
3364         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3365                               expires, flags);
3366         addrconf_verify(0);
3367
3368         return 0;
3369 }
3370
3371 static int
3372 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3373 {
3374         struct net *net = sock_net(skb->sk);
3375         struct ifaddrmsg *ifm;
3376         struct nlattr *tb[IFA_MAX+1];
3377         struct in6_addr *pfx;
3378         struct inet6_ifaddr *ifa;
3379         struct net_device *dev;
3380         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3381         u8 ifa_flags;
3382         int err;
3383
3384         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3385         if (err < 0)
3386                 return err;
3387
3388         ifm = nlmsg_data(nlh);
3389         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3390         if (pfx == NULL)
3391                 return -EINVAL;
3392
3393         if (tb[IFA_CACHEINFO]) {
3394                 struct ifa_cacheinfo *ci;
3395
3396                 ci = nla_data(tb[IFA_CACHEINFO]);
3397                 valid_lft = ci->ifa_valid;
3398                 preferred_lft = ci->ifa_prefered;
3399         } else {
3400                 preferred_lft = INFINITY_LIFE_TIME;
3401                 valid_lft = INFINITY_LIFE_TIME;
3402         }
3403
3404         dev =  __dev_get_by_index(net, ifm->ifa_index);
3405         if (dev == NULL)
3406                 return -ENODEV;
3407
3408         /* We ignore other flags so far. */
3409         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3410
3411         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3412         if (ifa == NULL) {
3413                 /*
3414                  * It would be best to check for !NLM_F_CREATE here but
3415                  * userspace alreay relies on not having to provide this.
3416                  */
3417                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3418                                       ifm->ifa_prefixlen, ifa_flags,
3419                                       preferred_lft, valid_lft);
3420         }
3421
3422         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3423             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3424                 err = -EEXIST;
3425         else
3426                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3427
3428         in6_ifa_put(ifa);
3429
3430         return err;
3431 }
3432
3433 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3434                           u8 scope, int ifindex)
3435 {
3436         struct ifaddrmsg *ifm;
3437
3438         ifm = nlmsg_data(nlh);
3439         ifm->ifa_family = AF_INET6;
3440         ifm->ifa_prefixlen = prefixlen;
3441         ifm->ifa_flags = flags;
3442         ifm->ifa_scope = scope;
3443         ifm->ifa_index = ifindex;
3444 }
3445
3446 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3447                          unsigned long tstamp, u32 preferred, u32 valid)
3448 {
3449         struct ifa_cacheinfo ci;
3450
3451         ci.cstamp = cstamp_delta(cstamp);
3452         ci.tstamp = cstamp_delta(tstamp);
3453         ci.ifa_prefered = preferred;
3454         ci.ifa_valid = valid;
3455
3456         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3457 }
3458
3459 static inline int rt_scope(int ifa_scope)
3460 {
3461         if (ifa_scope & IFA_HOST)
3462                 return RT_SCOPE_HOST;
3463         else if (ifa_scope & IFA_LINK)
3464                 return RT_SCOPE_LINK;
3465         else if (ifa_scope & IFA_SITE)
3466                 return RT_SCOPE_SITE;
3467         else
3468                 return RT_SCOPE_UNIVERSE;
3469 }
3470
3471 static inline int inet6_ifaddr_msgsize(void)
3472 {
3473         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3474                + nla_total_size(16) /* IFA_ADDRESS */
3475                + nla_total_size(sizeof(struct ifa_cacheinfo));
3476 }
3477
3478 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3479                              u32 pid, u32 seq, int event, unsigned int flags)
3480 {
3481         struct nlmsghdr  *nlh;
3482         u32 preferred, valid;
3483
3484         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3485         if (nlh == NULL)
3486                 return -EMSGSIZE;
3487
3488         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3489                       ifa->idev->dev->ifindex);
3490
3491         if (!(ifa->flags&IFA_F_PERMANENT)) {
3492                 preferred = ifa->prefered_lft;
3493                 valid = ifa->valid_lft;
3494                 if (preferred != INFINITY_LIFE_TIME) {
3495                         long tval = (jiffies - ifa->tstamp)/HZ;
3496                         if (preferred > tval)
3497                                 preferred -= tval;
3498                         else
3499                                 preferred = 0;
3500                         if (valid != INFINITY_LIFE_TIME) {
3501                                 if (valid > tval)
3502                                         valid -= tval;
3503                                 else
3504                                         valid = 0;
3505                         }
3506                 }
3507         } else {
3508                 preferred = INFINITY_LIFE_TIME;
3509                 valid = INFINITY_LIFE_TIME;
3510         }
3511
3512         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3513             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3514                 nlmsg_cancel(skb, nlh);
3515                 return -EMSGSIZE;
3516         }
3517
3518         return nlmsg_end(skb, nlh);
3519 }
3520
3521 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3522                                 u32 pid, u32 seq, int event, u16 flags)
3523 {
3524         struct nlmsghdr  *nlh;
3525         u8 scope = RT_SCOPE_UNIVERSE;
3526         int ifindex = ifmca->idev->dev->ifindex;
3527
3528         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3529                 scope = RT_SCOPE_SITE;
3530
3531         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3532         if (nlh == NULL)
3533                 return -EMSGSIZE;
3534
3535         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3536         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3537             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3538                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3539                 nlmsg_cancel(skb, nlh);
3540                 return -EMSGSIZE;
3541         }
3542
3543         return nlmsg_end(skb, nlh);
3544 }
3545
3546 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3547                                 u32 pid, u32 seq, int event, unsigned int flags)
3548 {
3549         struct nlmsghdr  *nlh;
3550         u8 scope = RT_SCOPE_UNIVERSE;
3551         int ifindex = ifaca->aca_idev->dev->ifindex;
3552
3553         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3554                 scope = RT_SCOPE_SITE;
3555
3556         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3557         if (nlh == NULL)
3558                 return -EMSGSIZE;
3559
3560         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3561         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3562             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3563                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3564                 nlmsg_cancel(skb, nlh);
3565                 return -EMSGSIZE;
3566         }
3567
3568         return nlmsg_end(skb, nlh);
3569 }
3570
3571 enum addr_type_t {
3572         UNICAST_ADDR,
3573         MULTICAST_ADDR,
3574         ANYCAST_ADDR,
3575 };
3576
3577 /* called with rcu_read_lock() */
3578 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3579                           struct netlink_callback *cb, enum addr_type_t type,
3580                           int s_ip_idx, int *p_ip_idx)
3581 {
3582         struct ifmcaddr6 *ifmca;
3583         struct ifacaddr6 *ifaca;
3584         int err = 1;
3585         int ip_idx = *p_ip_idx;
3586
3587         read_lock_bh(&idev->lock);
3588         switch (type) {
3589         case UNICAST_ADDR: {
3590                 struct inet6_ifaddr *ifa;
3591
3592                 /* unicast address incl. temp addr */
3593                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3594                         if (++ip_idx < s_ip_idx)
3595                                 continue;
3596                         err = inet6_fill_ifaddr(skb, ifa,
3597                                                 NETLINK_CB(cb->skb).pid,
3598                                                 cb->nlh->nlmsg_seq,
3599                                                 RTM_NEWADDR,
3600                                                 NLM_F_MULTI);
3601                         if (err <= 0)
3602                                 break;
3603                 }
3604                 break;
3605         }
3606         case MULTICAST_ADDR:
3607                 /* multicast address */
3608                 for (ifmca = idev->mc_list; ifmca;
3609                      ifmca = ifmca->next, ip_idx++) {
3610                         if (ip_idx < s_ip_idx)
3611                                 continue;
3612                         err = inet6_fill_ifmcaddr(skb, ifmca,
3613                                                   NETLINK_CB(cb->skb).pid,
3614                                                   cb->nlh->nlmsg_seq,
3615                                                   RTM_GETMULTICAST,
3616                                                   NLM_F_MULTI);
3617                         if (err <= 0)
3618                                 break;
3619                 }
3620                 break;
3621         case ANYCAST_ADDR:
3622                 /* anycast address */
3623                 for (ifaca = idev->ac_list; ifaca;
3624                      ifaca = ifaca->aca_next, ip_idx++) {
3625                         if (ip_idx < s_ip_idx)
3626                                 continue;
3627                         err = inet6_fill_ifacaddr(skb, ifaca,
3628                                                   NETLINK_CB(cb->skb).pid,
3629                                                   cb->nlh->nlmsg_seq,
3630                                                   RTM_GETANYCAST,
3631                                                   NLM_F_MULTI);
3632                         if (err <= 0)
3633                                 break;
3634                 }
3635                 break;
3636         default:
3637                 break;
3638         }
3639         read_unlock_bh(&idev->lock);
3640         *p_ip_idx = ip_idx;
3641         return err;
3642 }
3643
3644 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3645                            enum addr_type_t type)
3646 {
3647         struct net *net = sock_net(skb->sk);
3648         int h, s_h;
3649         int idx, ip_idx;
3650         int s_idx, s_ip_idx;
3651         struct net_device *dev;
3652         struct inet6_dev *idev;
3653         struct hlist_head *head;
3654         struct hlist_node *node;
3655
3656         s_h = cb->args[0];
3657         s_idx = idx = cb->args[1];
3658         s_ip_idx = ip_idx = cb->args[2];
3659
3660         rcu_read_lock();
3661         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3662                 idx = 0;
3663                 head = &net->dev_index_head[h];
3664                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3665                         if (idx < s_idx)
3666                                 goto cont;
3667                         if (h > s_h || idx > s_idx)
3668                                 s_ip_idx = 0;
3669                         ip_idx = 0;
3670                         idev = __in6_dev_get(dev);
3671                         if (!idev)
3672                                 goto cont;
3673
3674                         if (in6_dump_addrs(idev, skb, cb, type,
3675                                            s_ip_idx, &ip_idx) <= 0)
3676                                 goto done;
3677 cont:
3678                         idx++;
3679                 }
3680         }
3681 done:
3682         rcu_read_unlock();
3683         cb->args[0] = h;
3684         cb->args[1] = idx;
3685         cb->args[2] = ip_idx;
3686
3687         return skb->len;
3688 }
3689
3690 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3691 {
3692         enum addr_type_t type = UNICAST_ADDR;
3693
3694         return inet6_dump_addr(skb, cb, type);
3695 }
3696
3697 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3698 {
3699         enum addr_type_t type = MULTICAST_ADDR;
3700
3701         return inet6_dump_addr(skb, cb, type);
3702 }
3703
3704
3705 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3706 {
3707         enum addr_type_t type = ANYCAST_ADDR;
3708
3709         return inet6_dump_addr(skb, cb, type);
3710 }
3711
3712 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3713                              void *arg)
3714 {
3715         struct net *net = sock_net(in_skb->sk);
3716         struct ifaddrmsg *ifm;
3717         struct nlattr *tb[IFA_MAX+1];
3718         struct in6_addr *addr = NULL;
3719         struct net_device *dev = NULL;
3720         struct inet6_ifaddr *ifa;
3721         struct sk_buff *skb;
3722         int err;
3723
3724         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3725         if (err < 0)
3726                 goto errout;
3727
3728         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3729         if (addr == NULL) {
3730                 err = -EINVAL;
3731                 goto errout;
3732         }
3733
3734         ifm = nlmsg_data(nlh);
3735         if (ifm->ifa_index)
3736                 dev = __dev_get_by_index(net, ifm->ifa_index);
3737
3738         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3739         if (!ifa) {
3740                 err = -EADDRNOTAVAIL;
3741                 goto errout;
3742         }
3743
3744         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3745         if (!skb) {
3746                 err = -ENOBUFS;
3747                 goto errout_ifa;
3748         }
3749
3750         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3751                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3752         if (err < 0) {
3753                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3754                 WARN_ON(err == -EMSGSIZE);
3755                 kfree_skb(skb);
3756                 goto errout_ifa;
3757         }
3758         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3759 errout_ifa:
3760         in6_ifa_put(ifa);
3761 errout:
3762         return err;
3763 }
3764
3765 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3766 {
3767         struct sk_buff *skb;
3768         struct net *net = dev_net(ifa->idev->dev);
3769         int err = -ENOBUFS;
3770
3771         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3772         if (skb == NULL)
3773                 goto errout;
3774
3775         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3776         if (err < 0) {
3777                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3778                 WARN_ON(err == -EMSGSIZE);
3779                 kfree_skb(skb);
3780                 goto errout;
3781         }
3782         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3783         return;
3784 errout:
3785         if (err < 0)
3786                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3787 }
3788
3789 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3790                                 __s32 *array, int bytes)
3791 {
3792         BUG_ON(bytes < (DEVCONF_MAX * 4));
3793
3794         memset(array, 0, bytes);
3795         array[DEVCONF_FORWARDING] = cnf->forwarding;
3796         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3797         array[DEVCONF_MTU6] = cnf->mtu6;
3798         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3799         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3800         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3801         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3802         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3803         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3804                 jiffies_to_msecs(cnf->rtr_solicit_interval);
3805         array[DEVCONF_RTR_SOLICIT_DELAY] =
3806                 jiffies_to_msecs(cnf->rtr_solicit_delay);
3807         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3808 #ifdef CONFIG_IPV6_PRIVACY
3809         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3810         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3811         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3812         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3813         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3814 #endif
3815         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3816         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3817         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3818 #ifdef CONFIG_IPV6_ROUTER_PREF
3819         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3820         array[DEVCONF_RTR_PROBE_INTERVAL] =
3821                 jiffies_to_msecs(cnf->rtr_probe_interval);
3822 #ifdef CONFIG_IPV6_ROUTE_INFO
3823         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3824 #endif
3825 #endif
3826         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3827         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3828 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3829         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3830 #endif
3831 #ifdef CONFIG_IPV6_MROUTE
3832         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3833 #endif
3834         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3835         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3836         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3837 }
3838
3839 static inline size_t inet6_ifla6_size(void)
3840 {
3841         return nla_total_size(4) /* IFLA_INET6_FLAGS */
3842              + nla_total_size(sizeof(struct ifla_cacheinfo))
3843              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3844              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3845              + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3846 }
3847
3848 static inline size_t inet6_if_nlmsg_size(void)
3849 {
3850         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3851                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3852                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3853                + nla_total_size(4) /* IFLA_MTU */
3854                + nla_total_size(4) /* IFLA_LINK */
3855                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3856 }
3857
3858 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3859                                       int items, int bytes)
3860 {
3861         int i;
3862         int pad = bytes - sizeof(u64) * items;
3863         BUG_ON(pad < 0);
3864
3865         /* Use put_unaligned() because stats may not be aligned for u64. */
3866         put_unaligned(items, &stats[0]);
3867         for (i = 1; i < items; i++)
3868                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3869
3870         memset(&stats[items], 0, pad);
3871 }
3872
3873 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3874                                       int items, int bytes, size_t syncpoff)
3875 {
3876         int i;
3877         int pad = bytes - sizeof(u64) * items;
3878         BUG_ON(pad < 0);
3879
3880         /* Use put_unaligned() because stats may not be aligned for u64. */
3881         put_unaligned(items, &stats[0]);
3882         for (i = 1; i < items; i++)
3883                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3884
3885         memset(&stats[items], 0, pad);
3886 }
3887
3888 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3889                              int bytes)
3890 {
3891         switch (attrtype) {
3892         case IFLA_INET6_STATS:
3893                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3894                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3895                 break;
3896         case IFLA_INET6_ICMP6STATS:
3897                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3898                 break;
3899         }
3900 }
3901
3902 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3903 {
3904         struct nlattr *nla;
3905         struct ifla_cacheinfo ci;
3906
3907         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3908
3909         ci.max_reasm_len = IPV6_MAXPLEN;
3910         ci.tstamp = cstamp_delta(idev->tstamp);
3911         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3912         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3913         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3914
3915         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3916         if (nla == NULL)
3917                 goto nla_put_failure;
3918         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3919
3920         /* XXX - MC not implemented */
3921
3922         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3923         if (nla == NULL)
3924                 goto nla_put_failure;
3925         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3926
3927         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3928         if (nla == NULL)
3929                 goto nla_put_failure;
3930         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3931
3932         return 0;
3933
3934 nla_put_failure:
3935         return -EMSGSIZE;
3936 }
3937
3938 static size_t inet6_get_link_af_size(const struct net_device *dev)
3939 {
3940         if (!__in6_dev_get(dev))
3941                 return 0;
3942
3943         return inet6_ifla6_size();
3944 }
3945
3946 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3947 {
3948         struct inet6_dev *idev = __in6_dev_get(dev);
3949
3950         if (!idev)
3951                 return -ENODATA;
3952
3953         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3954                 return -EMSGSIZE;
3955
3956         return 0;
3957 }
3958
3959 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3960                              u32 pid, u32 seq, int event, unsigned int flags)
3961 {
3962         struct net_device *dev = idev->dev;
3963         struct ifinfomsg *hdr;
3964         struct nlmsghdr *nlh;
3965         void *protoinfo;
3966
3967         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3968         if (nlh == NULL)
3969                 return -EMSGSIZE;
3970
3971         hdr = nlmsg_data(nlh);
3972         hdr->ifi_family = AF_INET6;
3973         hdr->__ifi_pad = 0;
3974         hdr->ifi_type = dev->type;
3975         hdr->ifi_index = dev->ifindex;
3976         hdr->ifi_flags = dev_get_flags(dev);
3977         hdr->ifi_change = 0;
3978
3979         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3980
3981         if (dev->addr_len)
3982                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3983
3984         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3985         if (dev->ifindex != dev->iflink)
3986                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3987
3988         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3989         if (protoinfo == NULL)
3990                 goto nla_put_failure;
3991
3992         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3993                 goto nla_put_failure;
3994
3995         nla_nest_end(skb, protoinfo);
3996         return nlmsg_end(skb, nlh);
3997
3998 nla_put_failure:
3999         nlmsg_cancel(skb, nlh);
4000         return -EMSGSIZE;
4001 }
4002
4003 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4004 {
4005         struct net *net = sock_net(skb->sk);
4006         int h, s_h;
4007         int idx = 0, s_idx;
4008         struct net_device *dev;
4009         struct inet6_dev *idev;
4010         struct hlist_head *head;
4011         struct hlist_node *node;
4012
4013         s_h = cb->args[0];
4014         s_idx = cb->args[1];
4015
4016         rcu_read_lock();
4017         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4018                 idx = 0;
4019                 head = &net->dev_index_head[h];
4020                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4021                         if (idx < s_idx)
4022                                 goto cont;
4023                         idev = __in6_dev_get(dev);
4024                         if (!idev)
4025                                 goto cont;
4026                         if (inet6_fill_ifinfo(skb, idev,
4027                                               NETLINK_CB(cb->skb).pid,
4028                                               cb->nlh->nlmsg_seq,
4029                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4030                                 goto out;
4031 cont:
4032                         idx++;
4033                 }
4034         }
4035 out:
4036         rcu_read_unlock();
4037         cb->args[1] = idx;
4038         cb->args[0] = h;
4039
4040         return skb->len;
4041 }
4042
4043 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4044 {
4045         struct sk_buff *skb;
4046         struct net *net = dev_net(idev->dev);
4047         int err = -ENOBUFS;
4048
4049         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4050         if (skb == NULL)
4051                 goto errout;
4052
4053         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4054         if (err < 0) {
4055                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4056                 WARN_ON(err == -EMSGSIZE);
4057                 kfree_skb(skb);
4058                 goto errout;
4059         }
4060         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4061         return;
4062 errout:
4063         if (err < 0)
4064                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4065 }
4066
4067 static inline size_t inet6_prefix_nlmsg_size(void)
4068 {
4069         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4070                + nla_total_size(sizeof(struct in6_addr))
4071                + nla_total_size(sizeof(struct prefix_cacheinfo));
4072 }
4073
4074 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4075                              struct prefix_info *pinfo, u32 pid, u32 seq,
4076                              int event, unsigned int flags)
4077 {
4078         struct prefixmsg *pmsg;
4079         struct nlmsghdr *nlh;
4080         struct prefix_cacheinfo ci;
4081
4082         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4083         if (nlh == NULL)
4084                 return -EMSGSIZE;
4085
4086         pmsg = nlmsg_data(nlh);
4087         pmsg->prefix_family = AF_INET6;
4088         pmsg->prefix_pad1 = 0;
4089         pmsg->prefix_pad2 = 0;
4090         pmsg->prefix_ifindex = idev->dev->ifindex;
4091         pmsg->prefix_len = pinfo->prefix_len;
4092         pmsg->prefix_type = pinfo->type;
4093         pmsg->prefix_pad3 = 0;
4094         pmsg->prefix_flags = 0;
4095         if (pinfo->onlink)
4096                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4097         if (pinfo->autoconf)
4098                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4099
4100         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4101
4102         ci.preferred_time = ntohl(pinfo->prefered);
4103         ci.valid_time = ntohl(pinfo->valid);
4104         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4105
4106         return nlmsg_end(skb, nlh);
4107
4108 nla_put_failure:
4109         nlmsg_cancel(skb, nlh);
4110         return -EMSGSIZE;
4111 }
4112
4113 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4114                          struct prefix_info *pinfo)
4115 {
4116         struct sk_buff *skb;
4117         struct net *net = dev_net(idev->dev);
4118         int err = -ENOBUFS;
4119
4120         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4121         if (skb == NULL)
4122                 goto errout;
4123
4124         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4125         if (err < 0) {
4126                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4127                 WARN_ON(err == -EMSGSIZE);
4128                 kfree_skb(skb);
4129                 goto errout;
4130         }
4131         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4132         return;
4133 errout:
4134         if (err < 0)
4135                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4136 }
4137
4138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4139 {
4140         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4141
4142         switch (event) {
4143         case RTM_NEWADDR:
4144                 /*
4145                  * If the address was optimistic
4146                  * we inserted the route at the start of
4147                  * our DAD process, so we don't need
4148                  * to do it again
4149                  */
4150                 if (!(ifp->rt->rt6i_node))
4151                         ip6_ins_rt(ifp->rt);
4152                 if (ifp->idev->cnf.forwarding)
4153                         addrconf_join_anycast(ifp);
4154                 break;
4155         case RTM_DELADDR:
4156                 if (ifp->idev->cnf.forwarding)
4157                         addrconf_leave_anycast(ifp);
4158                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4159                 dst_hold(&ifp->rt->dst);
4160
4161                 if (ip6_del_rt(ifp->rt))
4162                         dst_free(&ifp->rt->dst);
4163                 break;
4164         }
4165 }
4166
4167 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4168 {
4169         rcu_read_lock_bh();
4170         if (likely(ifp->idev->dead == 0))
4171                 __ipv6_ifa_notify(event, ifp);
4172         rcu_read_unlock_bh();
4173 }
4174
4175 #ifdef CONFIG_SYSCTL
4176
4177 static
4178 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4179                            void __user *buffer, size_t *lenp, loff_t *ppos)
4180 {
4181         int *valp = ctl->data;
4182         int val = *valp;
4183         loff_t pos = *ppos;
4184         int ret;
4185
4186         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4187
4188         if (write)
4189                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4190         if (ret)
4191                 *ppos = pos;
4192         return ret;
4193 }
4194
4195 static void dev_disable_change(struct inet6_dev *idev)
4196 {
4197         if (!idev || !idev->dev)
4198                 return;
4199
4200         if (idev->cnf.disable_ipv6)
4201                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4202         else
4203                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4204 }
4205
4206 static void addrconf_disable_change(struct net *net, __s32 newf)
4207 {
4208         struct net_device *dev;
4209         struct inet6_dev *idev;
4210
4211         rcu_read_lock();
4212         for_each_netdev_rcu(net, dev) {
4213                 idev = __in6_dev_get(dev);
4214                 if (idev) {
4215                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4216                         idev->cnf.disable_ipv6 = newf;
4217                         if (changed)
4218                                 dev_disable_change(idev);
4219                 }
4220         }
4221         rcu_read_unlock();
4222 }
4223
4224 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4225 {
4226         struct net *net;
4227
4228         net = (struct net *)table->extra2;
4229
4230         if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4231                 return 0;
4232
4233         if (!rtnl_trylock()) {
4234                 /* Restore the original values before restarting */
4235                 *p = old;
4236                 return restart_syscall();
4237         }
4238
4239         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4240                 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4241                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4242                 addrconf_disable_change(net, newf);
4243         } else if ((!*p) ^ (!old))
4244                 dev_disable_change((struct inet6_dev *)table->extra1);
4245
4246         rtnl_unlock();
4247         return 0;
4248 }
4249
4250 static
4251 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4252                             void __user *buffer, size_t *lenp, loff_t *ppos)
4253 {
4254         int *valp = ctl->data;
4255         int val = *valp;
4256         loff_t pos = *ppos;
4257         int ret;
4258
4259         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4260
4261         if (write)
4262                 ret = addrconf_disable_ipv6(ctl, valp, val);
4263         if (ret)
4264                 *ppos = pos;
4265         return ret;
4266 }
4267
4268 static struct addrconf_sysctl_table
4269 {
4270         struct ctl_table_header *sysctl_header;
4271         ctl_table addrconf_vars[DEVCONF_MAX+1];
4272         char *dev_name;
4273 } addrconf_sysctl __read_mostly = {
4274         .sysctl_header = NULL,
4275         .addrconf_vars = {
4276                 {
4277                         .procname       = "forwarding",
4278                         .data           = &ipv6_devconf.forwarding,
4279                         .maxlen         = sizeof(int),
4280                         .mode           = 0644,
4281                         .proc_handler   = addrconf_sysctl_forward,
4282                 },
4283                 {
4284                         .procname       = "hop_limit",
4285                         .data           = &ipv6_devconf.hop_limit,
4286                         .maxlen         = sizeof(int),
4287                         .mode           = 0644,
4288                         .proc_handler   = proc_dointvec,
4289                 },
4290                 {
4291                         .procname       = "mtu",
4292                         .data           = &ipv6_devconf.mtu6,
4293                         .maxlen         = sizeof(int),
4294                         .mode           = 0644,
4295                         .proc_handler   = proc_dointvec,
4296                 },
4297                 {
4298                         .procname       = "accept_ra",
4299                         .data           = &ipv6_devconf.accept_ra,
4300                         .maxlen         = sizeof(int),
4301                         .mode           = 0644,
4302                         .proc_handler   = proc_dointvec,
4303                 },
4304                 {
4305                         .procname       = "accept_redirects",
4306                         .data           = &ipv6_devconf.accept_redirects,
4307                         .maxlen         = sizeof(int),
4308                         .mode           = 0644,
4309                         .proc_handler   = proc_dointvec,
4310                 },
4311                 {
4312                         .procname       = "autoconf",
4313                         .data           = &ipv6_devconf.autoconf,
4314                         .maxlen         = sizeof(int),
4315                         .mode           = 0644,
4316                         .proc_handler   = proc_dointvec,
4317                 },
4318                 {
4319                         .procname       = "dad_transmits",
4320                         .data           = &ipv6_devconf.dad_transmits,
4321                         .maxlen         = sizeof(int),
4322                         .mode           = 0644,
4323                         .proc_handler   = proc_dointvec,
4324                 },
4325                 {
4326                         .procname       = "router_solicitations",
4327                         .data           = &ipv6_devconf.rtr_solicits,
4328                         .maxlen         = sizeof(int),
4329                         .mode           = 0644,
4330                         .proc_handler   = proc_dointvec,
4331                 },
4332                 {
4333                         .procname       = "router_solicitation_interval",
4334                         .data           = &ipv6_devconf.rtr_solicit_interval,
4335                         .maxlen         = sizeof(int),
4336                         .mode           = 0644,
4337                         .proc_handler   = proc_dointvec_jiffies,
4338                 },
4339                 {
4340                         .procname       = "router_solicitation_delay",
4341                         .data           = &ipv6_devconf.rtr_solicit_delay,
4342                         .maxlen         = sizeof(int),
4343                         .mode           = 0644,
4344                         .proc_handler   = proc_dointvec_jiffies,
4345                 },
4346                 {
4347                         .procname       = "force_mld_version",
4348                         .data           = &ipv6_devconf.force_mld_version,
4349                         .maxlen         = sizeof(int),
4350                         .mode           = 0644,
4351                         .proc_handler   = proc_dointvec,
4352                 },
4353 #ifdef CONFIG_IPV6_PRIVACY
4354                 {
4355                         .procname       = "use_tempaddr",
4356                         .data           = &ipv6_devconf.use_tempaddr,
4357                         .maxlen         = sizeof(int),
4358                         .mode           = 0644,
4359                         .proc_handler   = proc_dointvec,
4360                 },
4361                 {
4362                         .procname       = "temp_valid_lft",
4363                         .data           = &ipv6_devconf.temp_valid_lft,
4364                         .maxlen         = sizeof(int),
4365                         .mode           = 0644,
4366                         .proc_handler   = proc_dointvec,
4367                 },
4368                 {
4369                         .procname       = "temp_prefered_lft",
4370                         .data           = &ipv6_devconf.temp_prefered_lft,
4371                         .maxlen         = sizeof(int),
4372                         .mode           = 0644,
4373                         .proc_handler   = proc_dointvec,
4374                 },
4375                 {
4376                         .procname       = "regen_max_retry",
4377                         .data           = &ipv6_devconf.regen_max_retry,
4378                         .maxlen         = sizeof(int),
4379                         .mode           = 0644,
4380                         .proc_handler   = proc_dointvec,
4381                 },
4382                 {
4383                         .procname       = "max_desync_factor",
4384                         .data           = &ipv6_devconf.max_desync_factor,
4385                         .maxlen         = sizeof(int),
4386                         .mode           = 0644,
4387                         .proc_handler   = proc_dointvec,
4388                 },
4389 #endif
4390                 {
4391                         .procname       = "max_addresses",
4392                         .data           = &ipv6_devconf.max_addresses,
4393                         .maxlen         = sizeof(int),
4394                         .mode           = 0644,
4395                         .proc_handler   = proc_dointvec,
4396                 },
4397                 {
4398                         .procname       = "accept_ra_defrtr",
4399                         .data           = &ipv6_devconf.accept_ra_defrtr,
4400                         .maxlen         = sizeof(int),
4401                         .mode           = 0644,
4402                         .proc_handler   = proc_dointvec,
4403                 },
4404                 {
4405                         .procname       = "accept_ra_pinfo",
4406                         .data           = &ipv6_devconf.accept_ra_pinfo,
4407                         .maxlen         = sizeof(int),
4408                         .mode           = 0644,
4409                         .proc_handler   = proc_dointvec,
4410                 },
4411 #ifdef CONFIG_IPV6_ROUTER_PREF
4412                 {
4413                         .procname       = "accept_ra_rtr_pref",
4414                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4415                         .maxlen         = sizeof(int),
4416                         .mode           = 0644,
4417                         .proc_handler   = proc_dointvec,
4418                 },
4419                 {
4420                         .procname       = "router_probe_interval",
4421                         .data           = &ipv6_devconf.rtr_probe_interval,
4422                         .maxlen         = sizeof(int),
4423                         .mode           = 0644,
4424                         .proc_handler   = proc_dointvec_jiffies,
4425                 },
4426 #ifdef CONFIG_IPV6_ROUTE_INFO
4427                 {
4428                         .procname       = "accept_ra_rt_info_max_plen",
4429                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4430                         .maxlen         = sizeof(int),
4431                         .mode           = 0644,
4432                         .proc_handler   = proc_dointvec,
4433                 },
4434 #endif
4435 #endif
4436                 {
4437                         .procname       = "proxy_ndp",
4438                         .data           = &ipv6_devconf.proxy_ndp,
4439                         .maxlen         = sizeof(int),
4440                         .mode           = 0644,
4441                         .proc_handler   = proc_dointvec,
4442                 },
4443                 {
4444                         .procname       = "accept_source_route",
4445                         .data           = &ipv6_devconf.accept_source_route,
4446                         .maxlen         = sizeof(int),
4447                         .mode           = 0644,
4448                         .proc_handler   = proc_dointvec,
4449                 },
4450 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4451                 {
4452                         .procname       = "optimistic_dad",
4453                         .data           = &ipv6_devconf.optimistic_dad,
4454                         .maxlen         = sizeof(int),
4455                         .mode           = 0644,
4456                         .proc_handler   = proc_dointvec,
4457
4458                 },
4459 #endif
4460 #ifdef CONFIG_IPV6_MROUTE
4461                 {
4462                         .procname       = "mc_forwarding",
4463                         .data           = &ipv6_devconf.mc_forwarding,
4464                         .maxlen         = sizeof(int),
4465                         .mode           = 0444,
4466                         .proc_handler   = proc_dointvec,
4467                 },
4468 #endif
4469                 {
4470                         .procname       = "disable_ipv6",
4471                         .data           = &ipv6_devconf.disable_ipv6,
4472                         .maxlen         = sizeof(int),
4473                         .mode           = 0644,
4474                         .proc_handler   = addrconf_sysctl_disable,
4475                 },
4476                 {
4477                         .procname       = "accept_dad",
4478                         .data           = &ipv6_devconf.accept_dad,
4479                         .maxlen         = sizeof(int),
4480                         .mode           = 0644,
4481                         .proc_handler   = proc_dointvec,
4482                 },
4483                 {
4484                         .procname       = "force_tllao",
4485                         .data           = &ipv6_devconf.force_tllao,
4486                         .maxlen         = sizeof(int),
4487                         .mode           = 0644,
4488                         .proc_handler   = proc_dointvec
4489                 },
4490                 {
4491                         /* sentinel */
4492                 }
4493         },
4494 };
4495
4496 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4497                 struct inet6_dev *idev, struct ipv6_devconf *p)
4498 {
4499         int i;
4500         struct addrconf_sysctl_table *t;
4501
4502 #define ADDRCONF_CTL_PATH_DEV   3
4503
4504         struct ctl_path addrconf_ctl_path[] = {
4505                 { .procname = "net", },
4506                 { .procname = "ipv6", },
4507                 { .procname = "conf", },
4508                 { /* to be set */ },
4509                 { },
4510         };
4511
4512
4513         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4514         if (t == NULL)
4515                 goto out;
4516
4517         for (i = 0; t->addrconf_vars[i].data; i++) {
4518                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4519                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4520                 t->addrconf_vars[i].extra2 = net;
4521         }
4522
4523         /*
4524          * Make a copy of dev_name, because '.procname' is regarded as const
4525          * by sysctl and we wouldn't want anyone to change it under our feet
4526          * (see SIOCSIFNAME).
4527          */
4528         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4529         if (!t->dev_name)
4530                 goto free;
4531
4532         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4533
4534         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4535                         t->addrconf_vars);
4536         if (t->sysctl_header == NULL)
4537                 goto free_procname;
4538
4539         p->sysctl = t;
4540         return 0;
4541
4542 free_procname:
4543         kfree(t->dev_name);
4544 free:
4545         kfree(t);
4546 out:
4547         return -ENOBUFS;
4548 }
4549
4550 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4551 {
4552         struct addrconf_sysctl_table *t;
4553
4554         if (p->sysctl == NULL)
4555                 return;
4556
4557         t = p->sysctl;
4558         p->sysctl = NULL;
4559         unregister_net_sysctl_table(t->sysctl_header);
4560         kfree(t->dev_name);
4561         kfree(t);
4562 }
4563
4564 static void addrconf_sysctl_register(struct inet6_dev *idev)
4565 {
4566         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4567                               &ndisc_ifinfo_sysctl_change);
4568         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4569                                         idev, &idev->cnf);
4570 }
4571
4572 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4573 {
4574         __addrconf_sysctl_unregister(&idev->cnf);
4575         neigh_sysctl_unregister(idev->nd_parms);
4576 }
4577
4578
4579 #endif
4580
4581 static int __net_init addrconf_init_net(struct net *net)
4582 {
4583         int err;
4584         struct ipv6_devconf *all, *dflt;
4585
4586         err = -ENOMEM;
4587         all = &ipv6_devconf;
4588         dflt = &ipv6_devconf_dflt;
4589
4590         if (!net_eq(net, &init_net)) {
4591                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4592                 if (all == NULL)
4593                         goto err_alloc_all;
4594
4595                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4596                 if (dflt == NULL)
4597                         goto err_alloc_dflt;
4598         } else {
4599                 /* these will be inherited by all namespaces */
4600                 dflt->autoconf = ipv6_defaults.autoconf;
4601                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4602         }
4603
4604         net->ipv6.devconf_all = all;
4605         net->ipv6.devconf_dflt = dflt;
4606
4607 #ifdef CONFIG_SYSCTL
4608         err = __addrconf_sysctl_register(net, "all", NULL, all);
4609         if (err < 0)
4610                 goto err_reg_all;
4611
4612         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4613         if (err < 0)
4614                 goto err_reg_dflt;
4615 #endif
4616         return 0;
4617
4618 #ifdef CONFIG_SYSCTL
4619 err_reg_dflt:
4620         __addrconf_sysctl_unregister(all);
4621 err_reg_all:
4622         kfree(dflt);
4623 #endif
4624 err_alloc_dflt:
4625         kfree(all);
4626 err_alloc_all:
4627         return err;
4628 }
4629
4630 static void __net_exit addrconf_exit_net(struct net *net)
4631 {
4632 #ifdef CONFIG_SYSCTL
4633         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4634         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4635 #endif
4636         if (!net_eq(net, &init_net)) {
4637                 kfree(net->ipv6.devconf_dflt);
4638                 kfree(net->ipv6.devconf_all);
4639         }
4640 }
4641
4642 static struct pernet_operations addrconf_ops = {
4643         .init = addrconf_init_net,
4644         .exit = addrconf_exit_net,
4645 };
4646
4647 /*
4648  *      Device notifier
4649  */
4650
4651 int register_inet6addr_notifier(struct notifier_block *nb)
4652 {
4653         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4654 }
4655 EXPORT_SYMBOL(register_inet6addr_notifier);
4656
4657 int unregister_inet6addr_notifier(struct notifier_block *nb)
4658 {
4659         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4660 }
4661 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4662
4663 static struct rtnl_af_ops inet6_ops = {
4664         .family           = AF_INET6,
4665         .fill_link_af     = inet6_fill_link_af,
4666         .get_link_af_size = inet6_get_link_af_size,
4667 };
4668
4669 /*
4670  *      Init / cleanup code
4671  */
4672
4673 int __init addrconf_init(void)
4674 {
4675         int i, err;
4676
4677         err = ipv6_addr_label_init();
4678         if (err < 0) {
4679                 printk(KERN_CRIT "IPv6 Addrconf:"
4680                        " cannot initialize default policy table: %d.\n", err);
4681                 goto out;
4682         }
4683
4684         err = register_pernet_subsys(&addrconf_ops);
4685         if (err < 0)
4686                 goto out_addrlabel;
4687
4688         /* The addrconf netdev notifier requires that loopback_dev
4689          * has it's ipv6 private information allocated and setup
4690          * before it can bring up and give link-local addresses
4691          * to other devices which are up.
4692          *
4693          * Unfortunately, loopback_dev is not necessarily the first
4694          * entry in the global dev_base list of net devices.  In fact,
4695          * it is likely to be the very last entry on that list.
4696          * So this causes the notifier registry below to try and
4697          * give link-local addresses to all devices besides loopback_dev
4698          * first, then loopback_dev, which cases all the non-loopback_dev
4699          * devices to fail to get a link-local address.
4700          *
4701          * So, as a temporary fix, allocate the ipv6 structure for
4702          * loopback_dev first by hand.
4703          * Longer term, all of the dependencies ipv6 has upon the loopback
4704          * device and it being up should be removed.
4705          */
4706         rtnl_lock();
4707         if (!ipv6_add_dev(init_net.loopback_dev))
4708                 err = -ENOMEM;
4709         rtnl_unlock();
4710         if (err)
4711                 goto errlo;
4712
4713         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4714                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4715
4716         register_netdevice_notifier(&ipv6_dev_notf);
4717
4718         addrconf_verify(0);
4719
4720         err = rtnl_af_register(&inet6_ops);
4721         if (err < 0)
4722                 goto errout_af;
4723
4724         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4725         if (err < 0)
4726                 goto errout;
4727
4728         /* Only the first call to __rtnl_register can fail */
4729         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4730         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4731         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4732         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4733         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4734
4735         ipv6_addr_label_rtnl_register();
4736
4737         return 0;
4738 errout:
4739         rtnl_af_unregister(&inet6_ops);
4740 errout_af:
4741         unregister_netdevice_notifier(&ipv6_dev_notf);
4742 errlo:
4743         unregister_pernet_subsys(&addrconf_ops);
4744 out_addrlabel:
4745         ipv6_addr_label_cleanup();
4746 out:
4747         return err;
4748 }
4749
4750 void addrconf_cleanup(void)
4751 {
4752         struct net_device *dev;
4753         int i;
4754
4755         unregister_netdevice_notifier(&ipv6_dev_notf);
4756         unregister_pernet_subsys(&addrconf_ops);
4757         ipv6_addr_label_cleanup();
4758
4759         rtnl_lock();
4760
4761         __rtnl_af_unregister(&inet6_ops);
4762
4763         /* clean dev list */
4764         for_each_netdev(&init_net, dev) {
4765                 if (__in6_dev_get(dev) == NULL)
4766                         continue;
4767                 addrconf_ifdown(dev, 1);
4768         }
4769         addrconf_ifdown(init_net.loopback_dev, 2);
4770
4771         /*
4772          *      Check hash table.
4773          */
4774         spin_lock_bh(&addrconf_hash_lock);
4775         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4776                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4777         spin_unlock_bh(&addrconf_hash_lock);
4778
4779         del_timer(&addr_chk_timer);
4780         rtnl_unlock();
4781 }