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 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
 102
 103 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
 104 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
 105 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
 106
 107 #ifdef CONFIG_SYSCTL
 108 static void addrconf_sysctl_register(struct inet6_dev *idev);
 109 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 110 #else
 111 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 112 {
 113 }
 114
 115 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 116 {
 117 }
 118 #endif
 119
 120 #ifdef CONFIG_IPV6_PRIVACY
 121 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 122 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 123 static void ipv6_regen_rndid(unsigned long data);
 124 #endif
 125
 126 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 127 static int ipv6_count_addresses(struct inet6_dev *idev);
 128
 129 /*
 130  *      Configured unicast address hash table
 131  */
 132 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 133 static DEFINE_SPINLOCK(addrconf_hash_lock);
 134
 135 static void addrconf_verify(unsigned long);
 136
 137 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 138 static DEFINE_SPINLOCK(addrconf_verify_lock);
 139
 140 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 141 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 142
 143 static void addrconf_type_change(struct net_device *dev,
 144                                  unsigned long event);
 145 static int addrconf_ifdown(struct net_device *dev, int how);
 146
 147 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 148 static void addrconf_dad_timer(unsigned long data);
 149 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 150 static void addrconf_dad_run(struct inet6_dev *idev);
 151 static void addrconf_rs_timer(unsigned long data);
 152 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 153 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 154
 155 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 156                                 struct prefix_info *pinfo);
 157 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 158                                struct net_device *dev);
 159
 160 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 161
 162 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 163         .forwarding             = 0,
 164         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 165         .mtu6                   = IPV6_MIN_MTU,
 166         .accept_ra              = 1,
 167         .accept_redirects       = 1,
 168         .autoconf               = 1,
 169         .force_mld_version      = 0,
 170         .dad_transmits          = 1,
 171         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 172         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 173         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 174 #ifdef CONFIG_IPV6_PRIVACY
 175         .use_tempaddr           = 0,
 176         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 177         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 178         .regen_max_retry        = REGEN_MAX_RETRY,
 179         .max_desync_factor      = MAX_DESYNC_FACTOR,
 180 #endif
 181         .max_addresses          = IPV6_MAX_ADDRESSES,
 182         .accept_ra_defrtr       = 1,
 183         .accept_ra_pinfo        = 1,
 184 #ifdef CONFIG_IPV6_ROUTER_PREF
 185         .accept_ra_rtr_pref     = 1,
 186         .rtr_probe_interval     = 60 * HZ,
 187 #ifdef CONFIG_IPV6_ROUTE_INFO
 188         .accept_ra_rt_info_max_plen = 0,
 189 #endif
 190 #endif
 191         .proxy_ndp              = 0,
 192         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 193         .disable_ipv6           = 0,
 194         .accept_dad             = 1,
 195 };
 196
 197 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 198         .forwarding             = 0,
 199         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 200         .mtu6                   = IPV6_MIN_MTU,
 201         .accept_ra              = 1,
 202         .accept_redirects       = 1,
 203         .autoconf               = 1,
 204         .dad_transmits          = 1,
 205         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 206         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 207         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 208 #ifdef CONFIG_IPV6_PRIVACY
 209         .use_tempaddr           = 0,
 210         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 211         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 212         .regen_max_retry        = REGEN_MAX_RETRY,
 213         .max_desync_factor      = MAX_DESYNC_FACTOR,
 214 #endif
 215         .max_addresses          = IPV6_MAX_ADDRESSES,
 216         .accept_ra_defrtr       = 1,
 217         .accept_ra_pinfo        = 1,
 218 #ifdef CONFIG_IPV6_ROUTER_PREF
 219         .accept_ra_rtr_pref     = 1,
 220         .rtr_probe_interval     = 60 * HZ,
 221 #ifdef CONFIG_IPV6_ROUTE_INFO
 222         .accept_ra_rt_info_max_plen = 0,
 223 #endif
 224 #endif
 225         .proxy_ndp              = 0,
 226         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 227         .disable_ipv6           = 0,
 228         .accept_dad             = 1,
 229 };
 230
 231 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 232 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 233 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 234 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 235 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 236
 237 /* Check if a valid qdisc is available */
 238 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 239 {
 240         return !qdisc_tx_is_noop(dev);
 241 }
 242
 243 /* Check if a route is valid prefix route */
 244 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 245 {
 246         return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
 247 }
 248
 249 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 250 {
 251         if (del_timer(&ifp->timer))
 252                 __in6_ifa_put(ifp);
 253 }
 254
 255 enum addrconf_timer_t {
 256         AC_NONE,
 257         AC_DAD,
 258         AC_RS,
 259 };
 260
 261 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 262                                enum addrconf_timer_t what,
 263                                unsigned long when)
 264 {
 265         if (!del_timer(&ifp->timer))
 266                 in6_ifa_hold(ifp);
 267
 268         switch (what) {
 269         case AC_DAD:
 270                 ifp->timer.function = addrconf_dad_timer;
 271                 break;
 272         case AC_RS:
 273                 ifp->timer.function = addrconf_rs_timer;
 274                 break;
 275         default:
 276                 break;
 277         }
 278         ifp->timer.expires = jiffies + when;
 279         add_timer(&ifp->timer);
 280 }
 281
 282 static int snmp6_alloc_dev(struct inet6_dev *idev)
 283 {
 284         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 285                           sizeof(struct ipstats_mib),
 286                           __alignof__(struct ipstats_mib)) < 0)
 287                 goto err_ip;
 288         if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
 289                           sizeof(struct icmpv6_mib),
 290                           __alignof__(struct icmpv6_mib)) < 0)
 291                 goto err_icmp;
 292         if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
 293                           sizeof(struct icmpv6msg_mib),
 294                           __alignof__(struct icmpv6msg_mib)) < 0)
 295                 goto err_icmpmsg;
 296
 297         return 0;
 298
 299 err_icmpmsg:
 300         snmp_mib_free((void __percpu **)idev->stats.icmpv6);
 301 err_icmp:
 302         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 303 err_ip:
 304         return -ENOMEM;
 305 }
 306
 307 static void snmp6_free_dev(struct inet6_dev *idev)
 308 {
 309         snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
 310         snmp_mib_free((void __percpu **)idev->stats.icmpv6);
 311         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 312 }
 313
 314 /* Nobody refers to this device, we may destroy it. */
 315
 316 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 317 {
 318         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 319         kfree(idev);
 320 }
 321
 322 void in6_dev_finish_destroy(struct inet6_dev *idev)
 323 {
 324         struct net_device *dev = idev->dev;
 325
 326         WARN_ON(!list_empty(&idev->addr_list));
 327         WARN_ON(idev->mc_list != NULL);
 328
 329 #ifdef NET_REFCNT_DEBUG
 330         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 331 #endif
 332         dev_put(dev);
 333         if (!idev->dead) {
 334                 pr_warning("Freeing alive inet6 device %p\n", idev);
 335                 return;
 336         }
 337         snmp6_free_dev(idev);
 338         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 339 }
 340
 341 EXPORT_SYMBOL(in6_dev_finish_destroy);
 342
 343 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 344 {
 345         struct inet6_dev *ndev;
 346
 347         ASSERT_RTNL();
 348
 349         if (dev->mtu < IPV6_MIN_MTU)
 350                 return NULL;
 351
 352         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 353
 354         if (ndev == NULL)
 355                 return NULL;
 356
 357         rwlock_init(&ndev->lock);
 358         ndev->dev = dev;
 359         INIT_LIST_HEAD(&ndev->addr_list);
 360
 361         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 362         ndev->cnf.mtu6 = dev->mtu;
 363         ndev->cnf.sysctl = NULL;
 364         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 365         if (ndev->nd_parms == NULL) {
 366                 kfree(ndev);
 367                 return NULL;
 368         }
 369         if (ndev->cnf.forwarding)
 370                 dev_disable_lro(dev);
 371         /* We refer to the device */
 372         dev_hold(dev);
 373
 374         if (snmp6_alloc_dev(ndev) < 0) {
 375                 ADBG((KERN_WARNING
 376                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 377                         __func__, dev->name));
 378                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 379                 ndev->dead = 1;
 380                 in6_dev_finish_destroy(ndev);
 381                 return NULL;
 382         }
 383
 384         if (snmp6_register_dev(ndev) < 0) {
 385                 ADBG((KERN_WARNING
 386                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 387                         __func__, dev->name));
 388                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 389                 ndev->dead = 1;
 390                 in6_dev_finish_destroy(ndev);
 391                 return NULL;
 392         }
 393
 394         /* One reference from device.  We must do this before
 395          * we invoke __ipv6_regen_rndid().
 396          */
 397         in6_dev_hold(ndev);
 398
 399         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 400                 ndev->cnf.accept_dad = -1;
 401
 402 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 403         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 404                 printk(KERN_INFO
 405                        "%s: Disabled Multicast RS\n",
 406                        dev->name);
 407                 ndev->cnf.rtr_solicits = 0;
 408         }
 409 #endif
 410
 411 #ifdef CONFIG_IPV6_PRIVACY
 412         INIT_LIST_HEAD(&ndev->tempaddr_list);
 413         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 414         if ((dev->flags&IFF_LOOPBACK) ||
 415             dev->type == ARPHRD_TUNNEL ||
 416             dev->type == ARPHRD_TUNNEL6 ||
 417             dev->type == ARPHRD_SIT ||
 418             dev->type == ARPHRD_NONE) {
 419                 printk(KERN_INFO
 420                        "%s: Disabled Privacy Extensions\n",
 421                        dev->name);
 422                 ndev->cnf.use_tempaddr = -1;
 423         } else {
 424                 in6_dev_hold(ndev);
 425                 ipv6_regen_rndid((unsigned long) ndev);
 426         }
 427 #endif
 428
 429         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 430                 ndev->if_flags |= IF_READY;
 431
 432         ipv6_mc_init_dev(ndev);
 433         ndev->tstamp = jiffies;
 434         addrconf_sysctl_register(ndev);
 435         /* protected by rtnl_lock */
 436         rcu_assign_pointer(dev->ip6_ptr, ndev);
 437
 438         /* Join all-node multicast group */
 439         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 440
 441         return ndev;
 442 }
 443
 444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 445 {
 446         struct inet6_dev *idev;
 447
 448         ASSERT_RTNL();
 449
 450         idev = __in6_dev_get(dev);
 451         if (!idev) {
 452                 idev = ipv6_add_dev(dev);
 453                 if (!idev)
 454                         return NULL;
 455         }
 456
 457         if (dev->flags&IFF_UP)
 458                 ipv6_mc_up(idev);
 459         return idev;
 460 }
 461
 462 #ifdef CONFIG_SYSCTL
 463 static void dev_forward_change(struct inet6_dev *idev)
 464 {
 465         struct net_device *dev;
 466         struct inet6_ifaddr *ifa;
 467
 468         if (!idev)
 469                 return;
 470         dev = idev->dev;
 471         if (idev->cnf.forwarding)
 472                 dev_disable_lro(dev);
 473         if (dev && (dev->flags & IFF_MULTICAST)) {
 474                 if (idev->cnf.forwarding)
 475                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 476                 else
 477                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 478         }
 479
 480         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 481                 if (ifa->flags&IFA_F_TENTATIVE)
 482                         continue;
 483                 if (idev->cnf.forwarding)
 484                         addrconf_join_anycast(ifa);
 485                 else
 486                         addrconf_leave_anycast(ifa);
 487         }
 488 }
 489
 490
 491 static void addrconf_forward_change(struct net *net, __s32 newf)
 492 {
 493         struct net_device *dev;
 494         struct inet6_dev *idev;
 495
 496         rcu_read_lock();
 497         for_each_netdev_rcu(net, dev) {
 498                 idev = __in6_dev_get(dev);
 499                 if (idev) {
 500                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 501                         idev->cnf.forwarding = newf;
 502                         if (changed)
 503                                 dev_forward_change(idev);
 504                 }
 505         }
 506         rcu_read_unlock();
 507 }
 508
 509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 510 {
 511         struct net *net;
 512
 513         net = (struct net *)table->extra2;
 514         if (p == &net->ipv6.devconf_dflt->forwarding)
 515                 return 0;
 516
 517         if (!rtnl_trylock()) {
 518                 /* Restore the original values before restarting */
 519                 *p = old;
 520                 return restart_syscall();
 521         }
 522
 523         if (p == &net->ipv6.devconf_all->forwarding) {
 524                 __s32 newf = net->ipv6.devconf_all->forwarding;
 525                 net->ipv6.devconf_dflt->forwarding = newf;
 526                 addrconf_forward_change(net, newf);
 527         } else if ((!*p) ^ (!old))
 528                 dev_forward_change((struct inet6_dev *)table->extra1);
 529         rtnl_unlock();
 530
 531         if (*p)
 532                 rt6_purge_dflt_routers(net);
 533         return 1;
 534 }
 535 #endif
 536
 537 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
 538 {
 539         struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
 540         kfree(ifp);
 541 }
 542
 543 /* Nobody refers to this ifaddr, destroy it */
 544 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 545 {
 546         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 547
 548 #ifdef NET_REFCNT_DEBUG
 549         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 550 #endif
 551
 552         in6_dev_put(ifp->idev);
 553
 554         if (del_timer(&ifp->timer))
 555                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 556
 557         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 558                 pr_warning("Freeing alive inet6 address %p\n", ifp);
 559                 return;
 560         }
 561         dst_release(&ifp->rt->dst);
 562
 563         call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
 564 }
 565
 566 static void
 567 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 568 {
 569         struct list_head *p;
 570         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 571
 572         /*
 573          * Each device address list is sorted in order of scope -
 574          * global before linklocal.
 575          */
 576         list_for_each(p, &idev->addr_list) {
 577                 struct inet6_ifaddr *ifa
 578                         = list_entry(p, struct inet6_ifaddr, if_list);
 579                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 580                         break;
 581         }
 582
 583         list_add_tail(&ifp->if_list, p);
 584 }
 585
 586 static u32 ipv6_addr_hash(const struct in6_addr *addr)
 587 {
 588         /*
 589          * We perform the hash function over the last 64 bits of the address
 590          * This will include the IEEE address token on links that support it.
 591          */
 592         return jhash_2words((__force u32)addr->s6_addr32[2],
 593                             (__force u32)addr->s6_addr32[3], 0)
 594                 & (IN6_ADDR_HSIZE - 1);
 595 }
 596
 597 /* On success it returns ifp with increased reference count */
 598
 599 static struct inet6_ifaddr *
 600 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 601               int scope, u32 flags)
 602 {
 603         struct inet6_ifaddr *ifa = NULL;
 604         struct rt6_info *rt;
 605         unsigned int hash;
 606         int err = 0;
 607         int addr_type = ipv6_addr_type(addr);
 608
 609         if (addr_type == IPV6_ADDR_ANY ||
 610             addr_type & IPV6_ADDR_MULTICAST ||
 611             (!(idev->dev->flags & IFF_LOOPBACK) &&
 612              addr_type & IPV6_ADDR_LOOPBACK))
 613                 return ERR_PTR(-EADDRNOTAVAIL);
 614
 615         rcu_read_lock_bh();
 616         if (idev->dead) {
 617                 err = -ENODEV;                  /*XXX*/
 618                 goto out2;
 619         }
 620
 621         if (idev->cnf.disable_ipv6) {
 622                 err = -EACCES;
 623                 goto out2;
 624         }
 625
 626         spin_lock(&addrconf_hash_lock);
 627
 628         /* Ignore adding duplicate addresses on an interface */
 629         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 630                 ADBG(("ipv6_add_addr: already assigned\n"));
 631                 err = -EEXIST;
 632                 goto out;
 633         }
 634
 635         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 636
 637         if (ifa == NULL) {
 638                 ADBG(("ipv6_add_addr: malloc failed\n"));
 639                 err = -ENOBUFS;
 640                 goto out;
 641         }
 642
 643         rt = addrconf_dst_alloc(idev, addr, 0);
 644         if (IS_ERR(rt)) {
 645                 err = PTR_ERR(rt);
 646                 goto out;
 647         }
 648
 649         ipv6_addr_copy(&ifa->addr, addr);
 650
 651         spin_lock_init(&ifa->lock);
 652         spin_lock_init(&ifa->state_lock);
 653         init_timer(&ifa->timer);
 654         INIT_HLIST_NODE(&ifa->addr_lst);
 655         ifa->timer.data = (unsigned long) ifa;
 656         ifa->scope = scope;
 657         ifa->prefix_len = pfxlen;
 658         ifa->flags = flags | IFA_F_TENTATIVE;
 659         ifa->cstamp = ifa->tstamp = jiffies;
 660
 661         ifa->rt = rt;
 662
 663         /*
 664          * part one of RFC 4429, section 3.3
 665          * We should not configure an address as
 666          * optimistic if we do not yet know the link
 667          * layer address of our nexhop router
 668          */
 669
 670         if (rt->rt6i_nexthop == NULL)
 671                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 672
 673         ifa->idev = idev;
 674         in6_dev_hold(idev);
 675         /* For caller */
 676         in6_ifa_hold(ifa);
 677
 678         /* Add to big hash table */
 679         hash = ipv6_addr_hash(addr);
 680
 681         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 682         spin_unlock(&addrconf_hash_lock);
 683
 684         write_lock(&idev->lock);
 685         /* Add to inet6_dev unicast addr list. */
 686         ipv6_link_dev_addr(idev, ifa);
 687
 688 #ifdef CONFIG_IPV6_PRIVACY
 689         if (ifa->flags&IFA_F_TEMPORARY) {
 690                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 691                 in6_ifa_hold(ifa);
 692         }
 693 #endif
 694
 695         in6_ifa_hold(ifa);
 696         write_unlock(&idev->lock);
 697 out2:
 698         rcu_read_unlock_bh();
 699
 700         if (likely(err == 0))
 701                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 702         else {
 703                 kfree(ifa);
 704                 ifa = ERR_PTR(err);
 705         }
 706
 707         return ifa;
 708 out:
 709         spin_unlock(&addrconf_hash_lock);
 710         goto out2;
 711 }
 712
 713 /* This function wants to get referenced ifp and releases it before return */
 714
 715 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 716 {
 717         struct inet6_ifaddr *ifa, *ifn;
 718         struct inet6_dev *idev = ifp->idev;
 719         int state;
 720         int hash;
 721         int deleted = 0, onlink = 0;
 722         unsigned long expires = jiffies;
 723
 724         hash = ipv6_addr_hash(&ifp->addr);
 725
 726         spin_lock_bh(&ifp->state_lock);
 727         state = ifp->state;
 728         ifp->state = INET6_IFADDR_STATE_DEAD;
 729         spin_unlock_bh(&ifp->state_lock);
 730
 731         if (state == INET6_IFADDR_STATE_DEAD)
 732                 goto out;
 733
 734         spin_lock_bh(&addrconf_hash_lock);
 735         hlist_del_init_rcu(&ifp->addr_lst);
 736         spin_unlock_bh(&addrconf_hash_lock);
 737
 738         write_lock_bh(&idev->lock);
 739 #ifdef CONFIG_IPV6_PRIVACY
 740         if (ifp->flags&IFA_F_TEMPORARY) {
 741                 list_del(&ifp->tmp_list);
 742                 if (ifp->ifpub) {
 743                         in6_ifa_put(ifp->ifpub);
 744                         ifp->ifpub = NULL;
 745                 }
 746                 __in6_ifa_put(ifp);
 747         }
 748 #endif
 749
 750         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 751                 if (ifa == ifp) {
 752                         list_del_init(&ifp->if_list);
 753                         __in6_ifa_put(ifp);
 754
 755                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 756                                 break;
 757                         deleted = 1;
 758                         continue;
 759                 } else if (ifp->flags & IFA_F_PERMANENT) {
 760                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 761                                               ifp->prefix_len)) {
 762                                 if (ifa->flags & IFA_F_PERMANENT) {
 763                                         onlink = 1;
 764                                         if (deleted)
 765                                                 break;
 766                                 } else {
 767                                         unsigned long lifetime;
 768
 769                                         if (!onlink)
 770                                                 onlink = -1;
 771
 772                                         spin_lock(&ifa->lock);
 773
 774                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 775                                         /*
 776                                          * Note: Because this address is
 777                                          * not permanent, lifetime <
 778                                          * LONG_MAX / HZ here.
 779                                          */
 780                                         if (time_before(expires,
 781                                                         ifa->tstamp + lifetime * HZ))
 782                                                 expires = ifa->tstamp + lifetime * HZ;
 783                                         spin_unlock(&ifa->lock);
 784                                 }
 785                         }
 786                 }
 787         }
 788         write_unlock_bh(&idev->lock);
 789
 790         addrconf_del_timer(ifp);
 791
 792         ipv6_ifa_notify(RTM_DELADDR, ifp);
 793
 794         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 795
 796         /*
 797          * Purge or update corresponding prefix
 798          *
 799          * 1) we don't purge prefix here if address was not permanent.
 800          *    prefix is managed by its own lifetime.
 801          * 2) if there're no addresses, delete prefix.
 802          * 3) if there're still other permanent address(es),
 803          *    corresponding prefix is still permanent.
 804          * 4) otherwise, update prefix lifetime to the
 805          *    longest valid lifetime among the corresponding
 806          *    addresses on the device.
 807          *    Note: subsequent RA will update lifetime.
 808          *
 809          * --yoshfuji
 810          */
 811         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 812                 struct in6_addr prefix;
 813                 struct rt6_info *rt;
 814                 struct net *net = dev_net(ifp->idev->dev);
 815                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 816                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 817
 818                 if (rt && addrconf_is_prefix_route(rt)) {
 819                         if (onlink == 0) {
 820                                 ip6_del_rt(rt);
 821                                 rt = NULL;
 822                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 823                                 rt->rt6i_expires = expires;
 824                                 rt->rt6i_flags |= RTF_EXPIRES;
 825                         }
 826                 }
 827                 dst_release(&rt->dst);
 828         }
 829
 830 out:
 831         in6_ifa_put(ifp);
 832 }
 833
 834 #ifdef CONFIG_IPV6_PRIVACY
 835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 836 {
 837         struct inet6_dev *idev = ifp->idev;
 838         struct in6_addr addr, *tmpaddr;
 839         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 840         unsigned long regen_advance;
 841         int tmp_plen;
 842         int ret = 0;
 843         int max_addresses;
 844         u32 addr_flags;
 845
 846         write_lock(&idev->lock);
 847         if (ift) {
 848                 spin_lock_bh(&ift->lock);
 849                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 850                 spin_unlock_bh(&ift->lock);
 851                 tmpaddr = &addr;
 852         } else {
 853                 tmpaddr = NULL;
 854         }
 855 retry:
 856         in6_dev_hold(idev);
 857         if (idev->cnf.use_tempaddr <= 0) {
 858                 write_unlock(&idev->lock);
 859                 printk(KERN_INFO
 860                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 861                 in6_dev_put(idev);
 862                 ret = -1;
 863                 goto out;
 864         }
 865         spin_lock_bh(&ifp->lock);
 866         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 867                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 868                 spin_unlock_bh(&ifp->lock);
 869                 write_unlock(&idev->lock);
 870                 printk(KERN_WARNING
 871                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 872                 in6_dev_put(idev);
 873                 ret = -1;
 874                 goto out;
 875         }
 876         in6_ifa_hold(ifp);
 877         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 878         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 879                 spin_unlock_bh(&ifp->lock);
 880                 write_unlock(&idev->lock);
 881                 printk(KERN_WARNING
 882                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 883                 in6_ifa_put(ifp);
 884                 in6_dev_put(idev);
 885                 ret = -1;
 886                 goto out;
 887         }
 888         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 889         tmp_valid_lft = min_t(__u32,
 890                               ifp->valid_lft,
 891                               idev->cnf.temp_valid_lft);
 892         tmp_prefered_lft = min_t(__u32,
 893                                  ifp->prefered_lft,
 894                                  idev->cnf.temp_prefered_lft -
 895                                  idev->cnf.max_desync_factor);
 896         tmp_plen = ifp->prefix_len;
 897         max_addresses = idev->cnf.max_addresses;
 898         tmp_cstamp = ifp->cstamp;
 899         tmp_tstamp = ifp->tstamp;
 900         spin_unlock_bh(&ifp->lock);
 901
 902         regen_advance = idev->cnf.regen_max_retry *
 903                         idev->cnf.dad_transmits *
 904                         idev->nd_parms->retrans_time / HZ;
 905         write_unlock(&idev->lock);
 906
 907         /* A temporary address is created only if this calculated Preferred
 908          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 909          * an implementation must not create a temporary address with a zero
 910          * Preferred Lifetime.
 911          */
 912         if (tmp_prefered_lft <= regen_advance) {
 913                 in6_ifa_put(ifp);
 914                 in6_dev_put(idev);
 915                 ret = -1;
 916                 goto out;
 917         }
 918
 919         addr_flags = IFA_F_TEMPORARY;
 920         /* set in addrconf_prefix_rcv() */
 921         if (ifp->flags & IFA_F_OPTIMISTIC)
 922                 addr_flags |= IFA_F_OPTIMISTIC;
 923
 924         ift = !max_addresses ||
 925               ipv6_count_addresses(idev) < max_addresses ?
 926                 ipv6_add_addr(idev, &addr, tmp_plen,
 927                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 928                               addr_flags) : NULL;
 929         if (!ift || IS_ERR(ift)) {
 930                 in6_ifa_put(ifp);
 931                 in6_dev_put(idev);
 932                 printk(KERN_INFO
 933                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 934                 tmpaddr = &addr;
 935                 write_lock(&idev->lock);
 936                 goto retry;
 937         }
 938
 939         spin_lock_bh(&ift->lock);
 940         ift->ifpub = ifp;
 941         ift->valid_lft = tmp_valid_lft;
 942         ift->prefered_lft = tmp_prefered_lft;
 943         ift->cstamp = tmp_cstamp;
 944         ift->tstamp = tmp_tstamp;
 945         spin_unlock_bh(&ift->lock);
 946
 947         addrconf_dad_start(ift, 0);
 948         in6_ifa_put(ift);
 949         in6_dev_put(idev);
 950 out:
 951         return ret;
 952 }
 953 #endif
 954
 955 /*
 956  *      Choose an appropriate source address (RFC3484)
 957  */
 958 enum {
 959         IPV6_SADDR_RULE_INIT = 0,
 960         IPV6_SADDR_RULE_LOCAL,
 961         IPV6_SADDR_RULE_SCOPE,
 962         IPV6_SADDR_RULE_PREFERRED,
 963 #ifdef CONFIG_IPV6_MIP6
 964         IPV6_SADDR_RULE_HOA,
 965 #endif
 966         IPV6_SADDR_RULE_OIF,
 967         IPV6_SADDR_RULE_LABEL,
 968 #ifdef CONFIG_IPV6_PRIVACY
 969         IPV6_SADDR_RULE_PRIVACY,
 970 #endif
 971         IPV6_SADDR_RULE_ORCHID,
 972         IPV6_SADDR_RULE_PREFIX,
 973         IPV6_SADDR_RULE_MAX
 974 };
 975
 976 struct ipv6_saddr_score {
 977         int                     rule;
 978         int                     addr_type;
 979         struct inet6_ifaddr     *ifa;
 980         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 981         int                     scopedist;
 982         int                     matchlen;
 983 };
 984
 985 struct ipv6_saddr_dst {
 986         const struct in6_addr *addr;
 987         int ifindex;
 988         int scope;
 989         int label;
 990         unsigned int prefs;
 991 };
 992
 993 static inline int ipv6_saddr_preferred(int type)
 994 {
 995         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
 996                 return 1;
 997         return 0;
 998 }
 999
1000 static int ipv6_get_saddr_eval(struct net *net,
1001                                struct ipv6_saddr_score *score,
1002                                struct ipv6_saddr_dst *dst,
1003                                int i)
1004 {
1005         int ret;
1006
1007         if (i <= score->rule) {
1008                 switch (i) {
1009                 case IPV6_SADDR_RULE_SCOPE:
1010                         ret = score->scopedist;
1011                         break;
1012                 case IPV6_SADDR_RULE_PREFIX:
1013                         ret = score->matchlen;
1014                         break;
1015                 default:
1016                         ret = !!test_bit(i, score->scorebits);
1017                 }
1018                 goto out;
1019         }
1020
1021         switch (i) {
1022         case IPV6_SADDR_RULE_INIT:
1023                 /* Rule 0: remember if hiscore is not ready yet */
1024                 ret = !!score->ifa;
1025                 break;
1026         case IPV6_SADDR_RULE_LOCAL:
1027                 /* Rule 1: Prefer same address */
1028                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1029                 break;
1030         case IPV6_SADDR_RULE_SCOPE:
1031                 /* Rule 2: Prefer appropriate scope
1032                  *
1033                  *      ret
1034                  *       ^
1035                  *    -1 |  d 15
1036                  *    ---+--+-+---> scope
1037                  *       |
1038                  *       |             d is scope of the destination.
1039                  *  B-d  |  \
1040                  *       |   \      <- smaller scope is better if
1041                  *  B-15 |    \        if scope is enough for destinaion.
1042                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1043                  * d-C-1 | /
1044                  *       |/         <- greater is better
1045                  *   -C  /             if scope is not enough for destination.
1046                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1047                  *
1048                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050                  * Assume B = 0 and we get C > 29.
1051                  */
1052                 ret = __ipv6_addr_src_scope(score->addr_type);
1053                 if (ret >= dst->scope)
1054                         ret = -ret;
1055                 else
1056                         ret -= 128;     /* 30 is enough */
1057                 score->scopedist = ret;
1058                 break;
1059         case IPV6_SADDR_RULE_PREFERRED:
1060                 /* Rule 3: Avoid deprecated and optimistic addresses */
1061                 ret = ipv6_saddr_preferred(score->addr_type) ||
1062                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1063                 break;
1064 #ifdef CONFIG_IPV6_MIP6
1065         case IPV6_SADDR_RULE_HOA:
1066             {
1067                 /* Rule 4: Prefer home address */
1068                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1070                 break;
1071             }
1072 #endif
1073         case IPV6_SADDR_RULE_OIF:
1074                 /* Rule 5: Prefer outgoing interface */
1075                 ret = (!dst->ifindex ||
1076                        dst->ifindex == score->ifa->idev->dev->ifindex);
1077                 break;
1078         case IPV6_SADDR_RULE_LABEL:
1079                 /* Rule 6: Prefer matching label */
1080                 ret = ipv6_addr_label(net,
1081                                       &score->ifa->addr, score->addr_type,
1082                                       score->ifa->idev->dev->ifindex) == dst->label;
1083                 break;
1084 #ifdef CONFIG_IPV6_PRIVACY
1085         case IPV6_SADDR_RULE_PRIVACY:
1086             {
1087                 /* Rule 7: Prefer public address
1088                  * Note: prefer temprary address if use_tempaddr >= 2
1089                  */
1090                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1093                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1094                 break;
1095             }
1096 #endif
1097         case IPV6_SADDR_RULE_ORCHID:
1098                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1099                  *          non-ORCHID vs non-ORCHID
1100                  */
1101                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102                         ipv6_addr_orchid(dst->addr));
1103                 break;
1104         case IPV6_SADDR_RULE_PREFIX:
1105                 /* Rule 8: Use longest matching prefix */
1106                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107                                                        dst->addr);
1108                 break;
1109         default:
1110                 ret = 0;
1111         }
1112
1113         if (ret)
1114                 __set_bit(i, score->scorebits);
1115         score->rule = i;
1116 out:
1117         return ret;
1118 }
1119
1120 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1121                        const struct in6_addr *daddr, unsigned int prefs,
1122                        struct in6_addr *saddr)
1123 {
1124         struct ipv6_saddr_score scores[2],
1125                                 *score = &scores[0], *hiscore = &scores[1];
1126         struct ipv6_saddr_dst dst;
1127         struct net_device *dev;
1128         int dst_type;
1129
1130         dst_type = __ipv6_addr_type(daddr);
1131         dst.addr = daddr;
1132         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133         dst.scope = __ipv6_addr_src_scope(dst_type);
1134         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1135         dst.prefs = prefs;
1136
1137         hiscore->rule = -1;
1138         hiscore->ifa = NULL;
1139
1140         rcu_read_lock();
1141
1142         for_each_netdev_rcu(net, dev) {
1143                 struct inet6_dev *idev;
1144
1145                 /* Candidate Source Address (section 4)
1146                  *  - multicast and link-local destination address,
1147                  *    the set of candidate source address MUST only
1148                  *    include addresses assigned to interfaces
1149                  *    belonging to the same link as the outgoing
1150                  *    interface.
1151                  * (- For site-local destination addresses, the
1152                  *    set of candidate source addresses MUST only
1153                  *    include addresses assigned to interfaces
1154                  *    belonging to the same site as the outgoing
1155                  *    interface.)
1156                  */
1157                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159                     dst.ifindex && dev->ifindex != dst.ifindex)
1160                         continue;
1161
1162                 idev = __in6_dev_get(dev);
1163                 if (!idev)
1164                         continue;
1165
1166                 read_lock_bh(&idev->lock);
1167                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1168                         int i;
1169
1170                         /*
1171                          * - Tentative Address (RFC2462 section 5.4)
1172                          *  - A tentative address is not considered
1173                          *    "assigned to an interface" in the traditional
1174                          *    sense, unless it is also flagged as optimistic.
1175                          * - Candidate Source Address (section 4)
1176                          *  - In any case, anycast addresses, multicast
1177                          *    addresses, and the unspecified address MUST
1178                          *    NOT be included in a candidate set.
1179                          */
1180                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1182                                 continue;
1183
1184                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1188                                 LIMIT_NETDEBUG(KERN_DEBUG
1189                                                "ADDRCONF: unspecified / multicast address "
1190                                                "assigned as unicast address on %s",
1191                                                dev->name);
1192                                 continue;
1193                         }
1194
1195                         score->rule = -1;
1196                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199                                 int minihiscore, miniscore;
1200
1201                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1203
1204                                 if (minihiscore > miniscore) {
1205                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1206                                             score->scopedist > 0) {
1207                                                 /*
1208                                                  * special case:
1209                                                  * each remaining entry
1210                                                  * has too small (not enough)
1211                                                  * scope, because ifa entries
1212                                                  * are sorted by their scope
1213                                                  * values.
1214                                                  */
1215                                                 goto try_nextdev;
1216                                         }
1217                                         break;
1218                                 } else if (minihiscore < miniscore) {
1219                                         if (hiscore->ifa)
1220                                                 in6_ifa_put(hiscore->ifa);
1221
1222                                         in6_ifa_hold(score->ifa);
1223
1224                                         swap(hiscore, score);
1225
1226                                         /* restore our iterator */
1227                                         score->ifa = hiscore->ifa;
1228
1229                                         break;
1230                                 }
1231                         }
1232                 }
1233 try_nextdev:
1234                 read_unlock_bh(&idev->lock);
1235         }
1236         rcu_read_unlock();
1237
1238         if (!hiscore->ifa)
1239                 return -EADDRNOTAVAIL;
1240
1241         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242         in6_ifa_put(hiscore->ifa);
1243         return 0;
1244 }
1245 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1246
1247 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1248                     unsigned char banned_flags)
1249 {
1250         struct inet6_dev *idev;
1251         int err = -EADDRNOTAVAIL;
1252
1253         rcu_read_lock();
1254         idev = __in6_dev_get(dev);
1255         if (idev) {
1256                 struct inet6_ifaddr *ifp;
1257
1258                 read_lock_bh(&idev->lock);
1259                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1260                         if (ifp->scope == IFA_LINK &&
1261                             !(ifp->flags & banned_flags)) {
1262                                 ipv6_addr_copy(addr, &ifp->addr);
1263                                 err = 0;
1264                                 break;
1265                         }
1266                 }
1267                 read_unlock_bh(&idev->lock);
1268         }
1269         rcu_read_unlock();
1270         return err;
1271 }
1272
1273 static int ipv6_count_addresses(struct inet6_dev *idev)
1274 {
1275         int cnt = 0;
1276         struct inet6_ifaddr *ifp;
1277
1278         read_lock_bh(&idev->lock);
1279         list_for_each_entry(ifp, &idev->addr_list, if_list)
1280                 cnt++;
1281         read_unlock_bh(&idev->lock);
1282         return cnt;
1283 }
1284
1285 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286                   struct net_device *dev, int strict)
1287 {
1288         struct inet6_ifaddr *ifp;
1289         struct hlist_node *node;
1290         unsigned int hash = ipv6_addr_hash(addr);
1291
1292         rcu_read_lock_bh();
1293         hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1294                 if (!net_eq(dev_net(ifp->idev->dev), net))
1295                         continue;
1296                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1297                     !(ifp->flags&IFA_F_TENTATIVE) &&
1298                     (dev == NULL || ifp->idev->dev == dev ||
1299                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1300                         rcu_read_unlock_bh();
1301                         return 1;
1302                 }
1303         }
1304
1305         rcu_read_unlock_bh();
1306         return 0;
1307 }
1308 EXPORT_SYMBOL(ipv6_chk_addr);
1309
1310 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1311                                struct net_device *dev)
1312 {
1313         unsigned int hash = ipv6_addr_hash(addr);
1314         struct inet6_ifaddr *ifp;
1315         struct hlist_node *node;
1316
1317         hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1318                 if (!net_eq(dev_net(ifp->idev->dev), net))
1319                         continue;
1320                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1321                         if (dev == NULL || ifp->idev->dev == dev)
1322                                 return true;
1323                 }
1324         }
1325         return false;
1326 }
1327
1328 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1329 {
1330         struct inet6_dev *idev;
1331         struct inet6_ifaddr *ifa;
1332         int     onlink;
1333
1334         onlink = 0;
1335         rcu_read_lock();
1336         idev = __in6_dev_get(dev);
1337         if (idev) {
1338                 read_lock_bh(&idev->lock);
1339                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1340                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1341                                                    ifa->prefix_len);
1342                         if (onlink)
1343                                 break;
1344                 }
1345                 read_unlock_bh(&idev->lock);
1346         }
1347         rcu_read_unlock();
1348         return onlink;
1349 }
1350
1351 EXPORT_SYMBOL(ipv6_chk_prefix);
1352
1353 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1354                                      struct net_device *dev, int strict)
1355 {
1356         struct inet6_ifaddr *ifp, *result = NULL;
1357         unsigned int hash = ipv6_addr_hash(addr);
1358         struct hlist_node *node;
1359
1360         rcu_read_lock_bh();
1361         hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1362                 if (!net_eq(dev_net(ifp->idev->dev), net))
1363                         continue;
1364                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1365                         if (dev == NULL || ifp->idev->dev == dev ||
1366                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1367                                 result = ifp;
1368                                 in6_ifa_hold(ifp);
1369                                 break;
1370                         }
1371                 }
1372         }
1373         rcu_read_unlock_bh();
1374
1375         return result;
1376 }
1377
1378 /* Gets referenced address, destroys ifaddr */
1379
1380 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1381 {
1382         if (ifp->flags&IFA_F_PERMANENT) {
1383                 spin_lock_bh(&ifp->lock);
1384                 addrconf_del_timer(ifp);
1385                 ifp->flags |= IFA_F_TENTATIVE;
1386                 if (dad_failed)
1387                         ifp->flags |= IFA_F_DADFAILED;
1388                 spin_unlock_bh(&ifp->lock);
1389                 if (dad_failed)
1390                         ipv6_ifa_notify(0, ifp);
1391                 in6_ifa_put(ifp);
1392 #ifdef CONFIG_IPV6_PRIVACY
1393         } else if (ifp->flags&IFA_F_TEMPORARY) {
1394                 struct inet6_ifaddr *ifpub;
1395                 spin_lock_bh(&ifp->lock);
1396                 ifpub = ifp->ifpub;
1397                 if (ifpub) {
1398                         in6_ifa_hold(ifpub);
1399                         spin_unlock_bh(&ifp->lock);
1400                         ipv6_create_tempaddr(ifpub, ifp);
1401                         in6_ifa_put(ifpub);
1402                 } else {
1403                         spin_unlock_bh(&ifp->lock);
1404                 }
1405                 ipv6_del_addr(ifp);
1406 #endif
1407         } else
1408                 ipv6_del_addr(ifp);
1409 }
1410
1411 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1412 {
1413         int err = -ENOENT;
1414
1415         spin_lock(&ifp->state_lock);
1416         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1417                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1418                 err = 0;
1419         }
1420         spin_unlock(&ifp->state_lock);
1421
1422         return err;
1423 }
1424
1425 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1426 {
1427         struct inet6_dev *idev = ifp->idev;
1428
1429         if (addrconf_dad_end(ifp))
1430                 return;
1431
1432         if (net_ratelimit())
1433                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1434                         ifp->idev->dev->name, &ifp->addr);
1435
1436         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1437                 struct in6_addr addr;
1438
1439                 addr.s6_addr32[0] = htonl(0xfe800000);
1440                 addr.s6_addr32[1] = 0;
1441
1442                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1443                     ipv6_addr_equal(&ifp->addr, &addr)) {
1444                         /* DAD failed for link-local based on MAC address */
1445                         idev->cnf.disable_ipv6 = 1;
1446
1447                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1448                                 ifp->idev->dev->name);
1449                 }
1450         }
1451
1452         addrconf_dad_stop(ifp, 1);
1453 }
1454
1455 /* Join to solicited addr multicast group. */
1456
1457 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1458 {
1459         struct in6_addr maddr;
1460
1461         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1462                 return;
1463
1464         addrconf_addr_solict_mult(addr, &maddr);
1465         ipv6_dev_mc_inc(dev, &maddr);
1466 }
1467
1468 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1469 {
1470         struct in6_addr maddr;
1471
1472         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1473                 return;
1474
1475         addrconf_addr_solict_mult(addr, &maddr);
1476         __ipv6_dev_mc_dec(idev, &maddr);
1477 }
1478
1479 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1480 {
1481         struct in6_addr addr;
1482         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1483         if (ipv6_addr_any(&addr))
1484                 return;
1485         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1486 }
1487
1488 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1489 {
1490         struct in6_addr addr;
1491         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1492         if (ipv6_addr_any(&addr))
1493                 return;
1494         __ipv6_dev_ac_dec(ifp->idev, &addr);
1495 }
1496
1497 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1498 {
1499         if (dev->addr_len != ETH_ALEN)
1500                 return -1;
1501         memcpy(eui, dev->dev_addr, 3);
1502         memcpy(eui + 5, dev->dev_addr + 3, 3);
1503
1504         /*
1505          * The zSeries OSA network cards can be shared among various
1506          * OS instances, but the OSA cards have only one MAC address.
1507          * This leads to duplicate address conflicts in conjunction
1508          * with IPv6 if more than one instance uses the same card.
1509          *
1510          * The driver for these cards can deliver a unique 16-bit
1511          * identifier for each instance sharing the same card.  It is
1512          * placed instead of 0xFFFE in the interface identifier.  The
1513          * "u" bit of the interface identifier is not inverted in this
1514          * case.  Hence the resulting interface identifier has local
1515          * scope according to RFC2373.
1516          */
1517         if (dev->dev_id) {
1518                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1519                 eui[4] = dev->dev_id & 0xFF;
1520         } else {
1521                 eui[3] = 0xFF;
1522                 eui[4] = 0xFE;
1523                 eui[0] ^= 2;
1524         }
1525         return 0;
1526 }
1527
1528 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1529 {
1530         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1531         if (dev->addr_len != ARCNET_ALEN)
1532                 return -1;
1533         memset(eui, 0, 7);
1534         eui[7] = *(u8*)dev->dev_addr;
1535         return 0;
1536 }
1537
1538 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1539 {
1540         if (dev->addr_len != INFINIBAND_ALEN)
1541                 return -1;
1542         memcpy(eui, dev->dev_addr + 12, 8);
1543         eui[0] |= 2;
1544         return 0;
1545 }
1546
1547 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1548 {
1549         if (addr == 0)
1550                 return -1;
1551         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1552                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1553                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1554                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1555                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1556                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1557         eui[1] = 0;
1558         eui[2] = 0x5E;
1559         eui[3] = 0xFE;
1560         memcpy(eui + 4, &addr, 4);
1561         return 0;
1562 }
1563
1564 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1565 {
1566         if (dev->priv_flags & IFF_ISATAP)
1567                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1568         return -1;
1569 }
1570
1571 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1572 {
1573         switch (dev->type) {
1574         case ARPHRD_ETHER:
1575         case ARPHRD_FDDI:
1576         case ARPHRD_IEEE802_TR:
1577                 return addrconf_ifid_eui48(eui, dev);
1578         case ARPHRD_ARCNET:
1579                 return addrconf_ifid_arcnet(eui, dev);
1580         case ARPHRD_INFINIBAND:
1581                 return addrconf_ifid_infiniband(eui, dev);
1582         case ARPHRD_SIT:
1583                 return addrconf_ifid_sit(eui, dev);
1584         }
1585         return -1;
1586 }
1587
1588 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1589 {
1590         int err = -1;
1591         struct inet6_ifaddr *ifp;
1592
1593         read_lock_bh(&idev->lock);
1594         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1595                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1596                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1597                         err = 0;
1598                         break;
1599                 }
1600         }
1601         read_unlock_bh(&idev->lock);
1602         return err;
1603 }
1604
1605 #ifdef CONFIG_IPV6_PRIVACY
1606 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1607 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1608 {
1609 regen:
1610         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1611         idev->rndid[0] &= ~0x02;
1612
1613         /*
1614          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1615          * check if generated address is not inappropriate
1616          *
1617          *  - Reserved subnet anycast (RFC 2526)
1618          *      11111101 11....11 1xxxxxxx
1619          *  - ISATAP (RFC4214) 6.1
1620          *      00-00-5E-FE-xx-xx-xx-xx
1621          *  - value 0
1622          *  - XXX: already assigned to an address on the device
1623          */
1624         if (idev->rndid[0] == 0xfd &&
1625             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1626             (idev->rndid[7]&0x80))
1627                 goto regen;
1628         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1629                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1630                         goto regen;
1631                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1632                         goto regen;
1633         }
1634
1635         return 0;
1636 }
1637
1638 static void ipv6_regen_rndid(unsigned long data)
1639 {
1640         struct inet6_dev *idev = (struct inet6_dev *) data;
1641         unsigned long expires;
1642
1643         rcu_read_lock_bh();
1644         write_lock_bh(&idev->lock);
1645
1646         if (idev->dead)
1647                 goto out;
1648
1649         if (__ipv6_regen_rndid(idev) < 0)
1650                 goto out;
1651
1652         expires = jiffies +
1653                 idev->cnf.temp_prefered_lft * HZ -
1654                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1655                 idev->cnf.max_desync_factor * HZ;
1656         if (time_before(expires, jiffies)) {
1657                 printk(KERN_WARNING
1658                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1659                         idev->dev->name);
1660                 goto out;
1661         }
1662
1663         if (!mod_timer(&idev->regen_timer, expires))
1664                 in6_dev_hold(idev);
1665
1666 out:
1667         write_unlock_bh(&idev->lock);
1668         rcu_read_unlock_bh();
1669         in6_dev_put(idev);
1670 }
1671
1672 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1673         int ret = 0;
1674
1675         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1676                 ret = __ipv6_regen_rndid(idev);
1677         return ret;
1678 }
1679 #endif
1680
1681 /*
1682  *      Add prefix route.
1683  */
1684
1685 static void
1686 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1687                       unsigned long expires, u32 flags)
1688 {
1689         struct fib6_config cfg = {
1690                 .fc_table = RT6_TABLE_PREFIX,
1691                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1692                 .fc_ifindex = dev->ifindex,
1693                 .fc_expires = expires,
1694                 .fc_dst_len = plen,
1695                 .fc_flags = RTF_UP | flags,
1696                 .fc_nlinfo.nl_net = dev_net(dev),
1697                 .fc_protocol = RTPROT_KERNEL,
1698         };
1699
1700         ipv6_addr_copy(&cfg.fc_dst, pfx);
1701
1702         /* Prevent useless cloning on PtP SIT.
1703            This thing is done here expecting that the whole
1704            class of non-broadcast devices need not cloning.
1705          */
1706 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1707         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1708                 cfg.fc_flags |= RTF_NONEXTHOP;
1709 #endif
1710
1711         ip6_route_add(&cfg);
1712 }
1713
1714 /* Create "default" multicast route to the interface */
1715
1716 static void addrconf_add_mroute(struct net_device *dev)
1717 {
1718         struct fib6_config cfg = {
1719                 .fc_table = RT6_TABLE_LOCAL,
1720                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1721                 .fc_ifindex = dev->ifindex,
1722                 .fc_dst_len = 8,
1723                 .fc_flags = RTF_UP,
1724                 .fc_nlinfo.nl_net = dev_net(dev),
1725         };
1726
1727         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1728
1729         ip6_route_add(&cfg);
1730 }
1731
1732 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1733 static void sit_route_add(struct net_device *dev)
1734 {
1735         struct fib6_config cfg = {
1736                 .fc_table = RT6_TABLE_MAIN,
1737                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1738                 .fc_ifindex = dev->ifindex,
1739                 .fc_dst_len = 96,
1740                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1741                 .fc_nlinfo.nl_net = dev_net(dev),
1742         };
1743
1744         /* prefix length - 96 bits "::d.d.d.d" */
1745         ip6_route_add(&cfg);
1746 }
1747 #endif
1748
1749 static void addrconf_add_lroute(struct net_device *dev)
1750 {
1751         struct in6_addr addr;
1752
1753         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1754         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1755 }
1756
1757 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1758 {
1759         struct inet6_dev *idev;
1760
1761         ASSERT_RTNL();
1762
1763         idev = ipv6_find_idev(dev);
1764         if (!idev)
1765                 return ERR_PTR(-ENOBUFS);
1766
1767         if (idev->cnf.disable_ipv6)
1768                 return ERR_PTR(-EACCES);
1769
1770         /* Add default multicast route */
1771         addrconf_add_mroute(dev);
1772
1773         /* Add link local route */
1774         addrconf_add_lroute(dev);
1775         return idev;
1776 }
1777
1778 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1779 {
1780         struct prefix_info *pinfo;
1781         __u32 valid_lft;
1782         __u32 prefered_lft;
1783         int addr_type;
1784         struct inet6_dev *in6_dev;
1785         struct net *net = dev_net(dev);
1786
1787         pinfo = (struct prefix_info *) opt;
1788
1789         if (len < sizeof(struct prefix_info)) {
1790                 ADBG(("addrconf: prefix option too short\n"));
1791                 return;
1792         }
1793
1794         /*
1795          *      Validation checks ([ADDRCONF], page 19)
1796          */
1797
1798         addr_type = ipv6_addr_type(&pinfo->prefix);
1799
1800         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1801                 return;
1802
1803         valid_lft = ntohl(pinfo->valid);
1804         prefered_lft = ntohl(pinfo->prefered);
1805
1806         if (prefered_lft > valid_lft) {
1807                 if (net_ratelimit())
1808                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1809                 return;
1810         }
1811
1812         in6_dev = in6_dev_get(dev);
1813
1814         if (in6_dev == NULL) {
1815                 if (net_ratelimit())
1816                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1817                 return;
1818         }
1819
1820         /*
1821          *      Two things going on here:
1822          *      1) Add routes for on-link prefixes
1823          *      2) Configure prefixes with the auto flag set
1824          */
1825
1826         if (pinfo->onlink) {
1827                 struct rt6_info *rt;
1828                 unsigned long rt_expires;
1829
1830                 /* Avoid arithmetic overflow. Really, we could
1831                  * save rt_expires in seconds, likely valid_lft,
1832                  * but it would require division in fib gc, that it
1833                  * not good.
1834                  */
1835                 if (HZ > USER_HZ)
1836                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1837                 else
1838                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1839
1840                 if (addrconf_finite_timeout(rt_expires))
1841                         rt_expires *= HZ;
1842
1843                 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1844                                 dev->ifindex, 1);
1845
1846                 if (rt && addrconf_is_prefix_route(rt)) {
1847                         /* Autoconf prefix route */
1848                         if (valid_lft == 0) {
1849                                 ip6_del_rt(rt);
1850                                 rt = NULL;
1851                         } else if (addrconf_finite_timeout(rt_expires)) {
1852                                 /* not infinity */
1853                                 rt->rt6i_expires = jiffies + rt_expires;
1854                                 rt->rt6i_flags |= RTF_EXPIRES;
1855                         } else {
1856                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1857                                 rt->rt6i_expires = 0;
1858                         }
1859                 } else if (valid_lft) {
1860                         clock_t expires = 0;
1861                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1862                         if (addrconf_finite_timeout(rt_expires)) {
1863                                 /* not infinity */
1864                                 flags |= RTF_EXPIRES;
1865                                 expires = jiffies_to_clock_t(rt_expires);
1866                         }
1867                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1868                                               dev, expires, flags);
1869                 }
1870                 if (rt)
1871                         dst_release(&rt->dst);
1872         }
1873
1874         /* Try to figure out our local address for this prefix */
1875
1876         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1877                 struct inet6_ifaddr * ifp;
1878                 struct in6_addr addr;
1879                 int create = 0, update_lft = 0;
1880
1881                 if (pinfo->prefix_len == 64) {
1882                         memcpy(&addr, &pinfo->prefix, 8);
1883                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1884                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1885                                 in6_dev_put(in6_dev);
1886                                 return;
1887                         }
1888                         goto ok;
1889                 }
1890                 if (net_ratelimit())
1891                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1892                                pinfo->prefix_len);
1893                 in6_dev_put(in6_dev);
1894                 return;
1895
1896 ok:
1897
1898                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1899
1900                 if (ifp == NULL && valid_lft) {
1901                         int max_addresses = in6_dev->cnf.max_addresses;
1902                         u32 addr_flags = 0;
1903
1904 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1905                         if (in6_dev->cnf.optimistic_dad &&
1906                             !net->ipv6.devconf_all->forwarding)
1907                                 addr_flags = IFA_F_OPTIMISTIC;
1908 #endif
1909
1910                         /* Do not allow to create too much of autoconfigured
1911                          * addresses; this would be too easy way to crash kernel.
1912                          */
1913                         if (!max_addresses ||
1914                             ipv6_count_addresses(in6_dev) < max_addresses)
1915                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1916                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1917                                                     addr_flags);
1918
1919                         if (!ifp || IS_ERR(ifp)) {
1920                                 in6_dev_put(in6_dev);
1921                                 return;
1922                         }
1923
1924                         update_lft = create = 1;
1925                         ifp->cstamp = jiffies;
1926                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1927                 }
1928
1929                 if (ifp) {
1930                         int flags;
1931                         unsigned long now;
1932 #ifdef CONFIG_IPV6_PRIVACY
1933                         struct inet6_ifaddr *ift;
1934 #endif
1935                         u32 stored_lft;
1936
1937                         /* update lifetime (RFC2462 5.5.3 e) */
1938                         spin_lock(&ifp->lock);
1939                         now = jiffies;
1940                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1941                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1942                         else
1943                                 stored_lft = 0;
1944                         if (!update_lft && stored_lft) {
1945                                 if (valid_lft > MIN_VALID_LIFETIME ||
1946                                     valid_lft > stored_lft)
1947                                         update_lft = 1;
1948                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1949                                         /* valid_lft <= stored_lft is always true */
1950                                         /*
1951                                          * RFC 4862 Section 5.5.3e:
1952                                          * "Note that the preferred lifetime of
1953                                          *  the corresponding address is always
1954                                          *  reset to the Preferred Lifetime in
1955                                          *  the received Prefix Information
1956                                          *  option, regardless of whether the
1957                                          *  valid lifetime is also reset or
1958                                          *  ignored."
1959                                          *
1960                                          *  So if the preferred lifetime in
1961                                          *  this advertisement is different
1962                                          *  than what we have stored, but the
1963                                          *  valid lifetime is invalid, just
1964                                          *  reset prefered_lft.
1965                                          *
1966                                          *  We must set the valid lifetime
1967                                          *  to the stored lifetime since we'll
1968                                          *  be updating the timestamp below,
1969                                          *  else we'll set it back to the
1970                                          *  minumum.
1971                                          */
1972                                         if (prefered_lft != ifp->prefered_lft) {
1973                                                 valid_lft = stored_lft;
1974                                                 update_lft = 1;
1975                                         }
1976                                 } else {
1977                                         valid_lft = MIN_VALID_LIFETIME;
1978                                         if (valid_lft < prefered_lft)
1979                                                 prefered_lft = valid_lft;
1980                                         update_lft = 1;
1981                                 }
1982                         }
1983
1984                         if (update_lft) {
1985                                 ifp->valid_lft = valid_lft;
1986                                 ifp->prefered_lft = prefered_lft;
1987                                 ifp->tstamp = now;
1988                                 flags = ifp->flags;
1989                                 ifp->flags &= ~IFA_F_DEPRECATED;
1990                                 spin_unlock(&ifp->lock);
1991
1992                                 if (!(flags&IFA_F_TENTATIVE))
1993                                         ipv6_ifa_notify(0, ifp);
1994                         } else
1995                                 spin_unlock(&ifp->lock);
1996
1997 #ifdef CONFIG_IPV6_PRIVACY
1998                         read_lock_bh(&in6_dev->lock);
1999                         /* update all temporary addresses in the list */
2000                         list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2001                                 /*
2002                                  * When adjusting the lifetimes of an existing
2003                                  * temporary address, only lower the lifetimes.
2004                                  * Implementations must not increase the
2005                                  * lifetimes of an existing temporary address
2006                                  * when processing a Prefix Information Option.
2007                                  */
2008                                 if (ifp != ift->ifpub)
2009                                         continue;
2010
2011                                 spin_lock(&ift->lock);
2012                                 flags = ift->flags;
2013                                 if (ift->valid_lft > valid_lft &&
2014                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2015                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2016                                 if (ift->prefered_lft > prefered_lft &&
2017                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2018                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2019                                 spin_unlock(&ift->lock);
2020                                 if (!(flags&IFA_F_TENTATIVE))
2021                                         ipv6_ifa_notify(0, ift);
2022                         }
2023
2024                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2025                                 /*
2026                                  * When a new public address is created as described in [ADDRCONF],
2027                                  * also create a new temporary address. Also create a temporary
2028                                  * address if it's enabled but no temporary address currently exists.
2029                                  */
2030                                 read_unlock_bh(&in6_dev->lock);
2031                                 ipv6_create_tempaddr(ifp, NULL);
2032                         } else {
2033                                 read_unlock_bh(&in6_dev->lock);
2034                         }
2035 #endif
2036                         in6_ifa_put(ifp);
2037                         addrconf_verify(0);
2038                 }
2039         }
2040         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2041         in6_dev_put(in6_dev);
2042 }
2043
2044 /*
2045  *      Set destination address.
2046  *      Special case for SIT interfaces where we create a new "virtual"
2047  *      device.
2048  */
2049 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2050 {
2051         struct in6_ifreq ireq;
2052         struct net_device *dev;
2053         int err = -EINVAL;
2054
2055         rtnl_lock();
2056
2057         err = -EFAULT;
2058         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2059                 goto err_exit;
2060
2061         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2062
2063         err = -ENODEV;
2064         if (dev == NULL)
2065                 goto err_exit;
2066
2067 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2068         if (dev->type == ARPHRD_SIT) {
2069                 const struct net_device_ops *ops = dev->netdev_ops;
2070                 struct ifreq ifr;
2071                 struct ip_tunnel_parm p;
2072
2073                 err = -EADDRNOTAVAIL;
2074                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2075                         goto err_exit;
2076
2077                 memset(&p, 0, sizeof(p));
2078                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2079                 p.iph.saddr = 0;
2080                 p.iph.version = 4;
2081                 p.iph.ihl = 5;
2082                 p.iph.protocol = IPPROTO_IPV6;
2083                 p.iph.ttl = 64;
2084                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2085
2086                 if (ops->ndo_do_ioctl) {
2087                         mm_segment_t oldfs = get_fs();
2088
2089                         set_fs(KERNEL_DS);
2090                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2091                         set_fs(oldfs);
2092                 } else
2093                         err = -EOPNOTSUPP;
2094
2095                 if (err == 0) {
2096                         err = -ENOBUFS;
2097                         dev = __dev_get_by_name(net, p.name);
2098                         if (!dev)
2099                                 goto err_exit;
2100                         err = dev_open(dev);
2101                 }
2102         }
2103 #endif
2104
2105 err_exit:
2106         rtnl_unlock();
2107         return err;
2108 }
2109
2110 /*
2111  *      Manual configuration of address on an interface
2112  */
2113 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2114                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2115                           __u32 valid_lft)
2116 {
2117         struct inet6_ifaddr *ifp;
2118         struct inet6_dev *idev;
2119         struct net_device *dev;
2120         int scope;
2121         u32 flags;
2122         clock_t expires;
2123         unsigned long timeout;
2124
2125         ASSERT_RTNL();
2126
2127         if (plen > 128)
2128                 return -EINVAL;
2129
2130         /* check the lifetime */
2131         if (!valid_lft || prefered_lft > valid_lft)
2132                 return -EINVAL;
2133
2134         dev = __dev_get_by_index(net, ifindex);
2135         if (!dev)
2136                 return -ENODEV;
2137
2138         idev = addrconf_add_dev(dev);
2139         if (IS_ERR(idev))
2140                 return PTR_ERR(idev);
2141
2142         scope = ipv6_addr_scope(pfx);
2143
2144         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2145         if (addrconf_finite_timeout(timeout)) {
2146                 expires = jiffies_to_clock_t(timeout * HZ);
2147                 valid_lft = timeout;
2148                 flags = RTF_EXPIRES;
2149         } else {
2150                 expires = 0;
2151                 flags = 0;
2152                 ifa_flags |= IFA_F_PERMANENT;
2153         }
2154
2155         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2156         if (addrconf_finite_timeout(timeout)) {
2157                 if (timeout == 0)
2158                         ifa_flags |= IFA_F_DEPRECATED;
2159                 prefered_lft = timeout;
2160         }
2161
2162         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2163
2164         if (!IS_ERR(ifp)) {
2165                 spin_lock_bh(&ifp->lock);
2166                 ifp->valid_lft = valid_lft;
2167                 ifp->prefered_lft = prefered_lft;
2168                 ifp->tstamp = jiffies;
2169                 spin_unlock_bh(&ifp->lock);
2170
2171                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2172                                       expires, flags);
2173                 /*
2174                  * Note that section 3.1 of RFC 4429 indicates
2175                  * that the Optimistic flag should not be set for
2176                  * manually configured addresses
2177                  */
2178                 addrconf_dad_start(ifp, 0);
2179                 in6_ifa_put(ifp);
2180                 addrconf_verify(0);
2181                 return 0;
2182         }
2183
2184         return PTR_ERR(ifp);
2185 }
2186
2187 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2188                           unsigned int plen)
2189 {
2190         struct inet6_ifaddr *ifp;
2191         struct inet6_dev *idev;
2192         struct net_device *dev;
2193
2194         if (plen > 128)
2195                 return -EINVAL;
2196
2197         dev = __dev_get_by_index(net, ifindex);
2198         if (!dev)
2199                 return -ENODEV;
2200
2201         if ((idev = __in6_dev_get(dev)) == NULL)
2202                 return -ENXIO;
2203
2204         read_lock_bh(&idev->lock);
2205         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2206                 if (ifp->prefix_len == plen &&
2207                     ipv6_addr_equal(pfx, &ifp->addr)) {
2208                         in6_ifa_hold(ifp);
2209                         read_unlock_bh(&idev->lock);
2210
2211                         ipv6_del_addr(ifp);
2212
2213                         /* If the last address is deleted administratively,
2214                            disable IPv6 on this interface.
2215                          */
2216                         if (list_empty(&idev->addr_list))
2217                                 addrconf_ifdown(idev->dev, 1);
2218                         return 0;
2219                 }
2220         }
2221         read_unlock_bh(&idev->lock);
2222         return -EADDRNOTAVAIL;
2223 }
2224
2225
2226 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2227 {
2228         struct in6_ifreq ireq;
2229         int err;
2230
2231         if (!capable(CAP_NET_ADMIN))
2232                 return -EPERM;
2233
2234         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2235                 return -EFAULT;
2236
2237         rtnl_lock();
2238         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2239                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2240                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2241         rtnl_unlock();
2242         return err;
2243 }
2244
2245 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2246 {
2247         struct in6_ifreq ireq;
2248         int err;
2249
2250         if (!capable(CAP_NET_ADMIN))
2251                 return -EPERM;
2252
2253         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2254                 return -EFAULT;
2255
2256         rtnl_lock();
2257         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2258                              ireq.ifr6_prefixlen);
2259         rtnl_unlock();
2260         return err;
2261 }
2262
2263 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2264                      int plen, int scope)
2265 {
2266         struct inet6_ifaddr *ifp;
2267
2268         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2269         if (!IS_ERR(ifp)) {
2270                 spin_lock_bh(&ifp->lock);
2271                 ifp->flags &= ~IFA_F_TENTATIVE;
2272                 spin_unlock_bh(&ifp->lock);
2273                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2274                 in6_ifa_put(ifp);
2275         }
2276 }
2277
2278 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2279 static void sit_add_v4_addrs(struct inet6_dev *idev)
2280 {
2281         struct in6_addr addr;
2282         struct net_device *dev;
2283         struct net *net = dev_net(idev->dev);
2284         int scope;
2285
2286         ASSERT_RTNL();
2287
2288         memset(&addr, 0, sizeof(struct in6_addr));
2289         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2290
2291         if (idev->dev->flags&IFF_POINTOPOINT) {
2292                 addr.s6_addr32[0] = htonl(0xfe800000);
2293                 scope = IFA_LINK;
2294         } else {
2295                 scope = IPV6_ADDR_COMPATv4;
2296         }
2297
2298         if (addr.s6_addr32[3]) {
2299                 add_addr(idev, &addr, 128, scope);
2300                 return;
2301         }
2302
2303         for_each_netdev(net, dev) {
2304                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2305                 if (in_dev && (dev->flags & IFF_UP)) {
2306                         struct in_ifaddr * ifa;
2307
2308                         int flag = scope;
2309
2310                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2311                                 int plen;
2312
2313                                 addr.s6_addr32[3] = ifa->ifa_local;
2314
2315                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2316                                         continue;
2317                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2318                                         if (idev->dev->flags&IFF_POINTOPOINT)
2319                                                 continue;
2320                                         flag |= IFA_HOST;
2321                                 }
2322                                 if (idev->dev->flags&IFF_POINTOPOINT)
2323                                         plen = 64;
2324                                 else
2325                                         plen = 96;
2326
2327                                 add_addr(idev, &addr, plen, flag);
2328                         }
2329                 }
2330         }
2331 }
2332 #endif
2333
2334 static void init_loopback(struct net_device *dev)
2335 {
2336         struct inet6_dev  *idev;
2337
2338         /* ::1 */
2339
2340         ASSERT_RTNL();
2341
2342         if ((idev = ipv6_find_idev(dev)) == NULL) {
2343                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2344                 return;
2345         }
2346
2347         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2348 }
2349
2350 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2351 {
2352         struct inet6_ifaddr * ifp;
2353         u32 addr_flags = IFA_F_PERMANENT;
2354
2355 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2356         if (idev->cnf.optimistic_dad &&
2357             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2358                 addr_flags |= IFA_F_OPTIMISTIC;
2359 #endif
2360
2361
2362         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2363         if (!IS_ERR(ifp)) {
2364                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2365                 addrconf_dad_start(ifp, 0);
2366                 in6_ifa_put(ifp);
2367         }
2368 }
2369
2370 static void addrconf_dev_config(struct net_device *dev)
2371 {
2372         struct in6_addr addr;
2373         struct inet6_dev    * idev;
2374
2375         ASSERT_RTNL();
2376
2377         if ((dev->type != ARPHRD_ETHER) &&
2378             (dev->type != ARPHRD_FDDI) &&
2379             (dev->type != ARPHRD_IEEE802_TR) &&
2380             (dev->type != ARPHRD_ARCNET) &&
2381             (dev->type != ARPHRD_INFINIBAND)) {
2382                 /* Alas, we support only Ethernet autoconfiguration. */
2383                 return;
2384         }
2385
2386         idev = addrconf_add_dev(dev);
2387         if (IS_ERR(idev))
2388                 return;
2389
2390         memset(&addr, 0, sizeof(struct in6_addr));
2391         addr.s6_addr32[0] = htonl(0xFE800000);
2392
2393         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2394                 addrconf_add_linklocal(idev, &addr);
2395 }
2396
2397 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2398 static void addrconf_sit_config(struct net_device *dev)
2399 {
2400         struct inet6_dev *idev;
2401
2402         ASSERT_RTNL();
2403
2404         /*
2405          * Configure the tunnel with one of our IPv4
2406          * addresses... we should configure all of
2407          * our v4 addrs in the tunnel
2408          */
2409
2410         if ((idev = ipv6_find_idev(dev)) == NULL) {
2411                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2412                 return;
2413         }
2414
2415         if (dev->priv_flags & IFF_ISATAP) {
2416                 struct in6_addr addr;
2417
2418                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2419                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2420                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2421                         addrconf_add_linklocal(idev, &addr);
2422                 return;
2423         }
2424
2425         sit_add_v4_addrs(idev);
2426
2427         if (dev->flags&IFF_POINTOPOINT) {
2428                 addrconf_add_mroute(dev);
2429                 addrconf_add_lroute(dev);
2430         } else
2431                 sit_route_add(dev);
2432 }
2433 #endif
2434
2435 static inline int
2436 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2437 {
2438         struct in6_addr lladdr;
2439
2440         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2441                 addrconf_add_linklocal(idev, &lladdr);
2442                 return 0;
2443         }
2444         return -1;
2445 }
2446
2447 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2448 {
2449         struct net_device *link_dev;
2450         struct net *net = dev_net(idev->dev);
2451
2452         /* first try to inherit the link-local address from the link device */
2453         if (idev->dev->iflink &&
2454             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2455                 if (!ipv6_inherit_linklocal(idev, link_dev))
2456                         return;
2457         }
2458         /* then try to inherit it from any device */
2459         for_each_netdev(net, link_dev) {
2460                 if (!ipv6_inherit_linklocal(idev, link_dev))
2461                         return;
2462         }
2463         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2464 }
2465
2466 /*
2467  * Autoconfigure tunnel with a link-local address so routing protocols,
2468  * DHCPv6, MLD etc. can be run over the virtual link
2469  */
2470
2471 static void addrconf_ip6_tnl_config(struct net_device *dev)
2472 {
2473         struct inet6_dev *idev;
2474
2475         ASSERT_RTNL();
2476
2477         idev = addrconf_add_dev(dev);
2478         if (IS_ERR(idev)) {
2479                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2480                 return;
2481         }
2482         ip6_tnl_add_linklocal(idev);
2483 }
2484
2485 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2486                            void * data)
2487 {
2488         struct net_device *dev = (struct net_device *) data;
2489         struct inet6_dev *idev = __in6_dev_get(dev);
2490         int run_pending = 0;
2491         int err;
2492
2493         switch (event) {
2494         case NETDEV_REGISTER:
2495                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2496                         idev = ipv6_add_dev(dev);
2497                         if (!idev)
2498                                 return notifier_from_errno(-ENOMEM);
2499                 }
2500                 break;
2501
2502         case NETDEV_UP:
2503         case NETDEV_CHANGE:
2504                 if (dev->flags & IFF_SLAVE)
2505                         break;
2506
2507                 if (event == NETDEV_UP) {
2508                         if (!addrconf_qdisc_ok(dev)) {
2509                                 /* device is not ready yet. */
2510                                 printk(KERN_INFO
2511                                         "ADDRCONF(NETDEV_UP): %s: "
2512                                         "link is not ready\n",
2513                                         dev->name);
2514                                 break;
2515                         }
2516
2517                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2518                                 idev = ipv6_add_dev(dev);
2519
2520                         if (idev) {
2521                                 idev->if_flags |= IF_READY;
2522                                 run_pending = 1;
2523                         }
2524                 } else {
2525                         if (!addrconf_qdisc_ok(dev)) {
2526                                 /* device is still not ready. */
2527                                 break;
2528                         }
2529
2530                         if (idev) {
2531                                 if (idev->if_flags & IF_READY)
2532                                         /* device is already configured. */
2533                                         break;
2534                                 idev->if_flags |= IF_READY;
2535                         }
2536
2537                         printk(KERN_INFO
2538                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2539                                         "link becomes ready\n",
2540                                         dev->name);
2541
2542                         run_pending = 1;
2543                 }
2544
2545                 switch (dev->type) {
2546 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2547                 case ARPHRD_SIT:
2548                         addrconf_sit_config(dev);
2549                         break;
2550 #endif
2551                 case ARPHRD_TUNNEL6:
2552                         addrconf_ip6_tnl_config(dev);
2553                         break;
2554                 case ARPHRD_LOOPBACK:
2555                         init_loopback(dev);
2556                         break;
2557
2558                 default:
2559                         addrconf_dev_config(dev);
2560                         break;
2561                 }
2562
2563                 if (idev) {
2564                         if (run_pending)
2565                                 addrconf_dad_run(idev);
2566
2567                         /*
2568                          * If the MTU changed during the interface down,
2569                          * when the interface up, the changed MTU must be
2570                          * reflected in the idev as well as routers.
2571                          */
2572                         if (idev->cnf.mtu6 != dev->mtu &&
2573                             dev->mtu >= IPV6_MIN_MTU) {
2574                                 rt6_mtu_change(dev, dev->mtu);
2575                                 idev->cnf.mtu6 = dev->mtu;
2576                         }
2577                         idev->tstamp = jiffies;
2578                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2579
2580                         /*
2581                          * If the changed mtu during down is lower than
2582                          * IPV6_MIN_MTU stop IPv6 on this interface.
2583                          */
2584                         if (dev->mtu < IPV6_MIN_MTU)
2585                                 addrconf_ifdown(dev, 1);
2586                 }
2587                 break;
2588
2589         case NETDEV_CHANGEMTU:
2590                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2591                         rt6_mtu_change(dev, dev->mtu);
2592                         idev->cnf.mtu6 = dev->mtu;
2593                         break;
2594                 }
2595
2596                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2597                         idev = ipv6_add_dev(dev);
2598                         if (idev)
2599                                 break;
2600                 }
2601
2602                 /*
2603                  * MTU falled under IPV6_MIN_MTU.
2604                  * Stop IPv6 on this interface.
2605                  */
2606
2607         case NETDEV_DOWN:
2608         case NETDEV_UNREGISTER:
2609                 /*
2610                  *      Remove all addresses from this interface.
2611                  */
2612                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2613                 break;
2614
2615         case NETDEV_CHANGENAME:
2616                 if (idev) {
2617                         snmp6_unregister_dev(idev);
2618                         addrconf_sysctl_unregister(idev);
2619                         addrconf_sysctl_register(idev);
2620                         err = snmp6_register_dev(idev);
2621                         if (err)
2622                                 return notifier_from_errno(err);
2623                 }
2624                 break;
2625
2626         case NETDEV_PRE_TYPE_CHANGE:
2627         case NETDEV_POST_TYPE_CHANGE:
2628                 addrconf_type_change(dev, event);
2629                 break;
2630         }
2631
2632         return NOTIFY_OK;
2633 }
2634
2635 /*
2636  *      addrconf module should be notified of a device going up
2637  */
2638 static struct notifier_block ipv6_dev_notf = {
2639         .notifier_call = addrconf_notify,
2640 };
2641
2642 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2643 {
2644         struct inet6_dev *idev;
2645         ASSERT_RTNL();
2646
2647         idev = __in6_dev_get(dev);
2648
2649         if (event == NETDEV_POST_TYPE_CHANGE)
2650                 ipv6_mc_remap(idev);
2651         else if (event == NETDEV_PRE_TYPE_CHANGE)
2652                 ipv6_mc_unmap(idev);
2653 }
2654
2655 static int addrconf_ifdown(struct net_device *dev, int how)
2656 {
2657         struct net *net = dev_net(dev);
2658         struct inet6_dev *idev;
2659         struct inet6_ifaddr *ifa;
2660         LIST_HEAD(keep_list);
2661         int state;
2662
2663         ASSERT_RTNL();
2664
2665         rt6_ifdown(net, dev);
2666         neigh_ifdown(&nd_tbl, dev);
2667
2668         idev = __in6_dev_get(dev);
2669         if (idev == NULL)
2670                 return -ENODEV;
2671
2672         /*
2673          * Step 1: remove reference to ipv6 device from parent device.
2674          *         Do not dev_put!
2675          */
2676         if (how) {
2677                 idev->dead = 1;
2678
2679                 /* protected by rtnl_lock */
2680                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2681
2682                 /* Step 1.5: remove snmp6 entry */
2683                 snmp6_unregister_dev(idev);
2684
2685         }
2686
2687         write_lock_bh(&idev->lock);
2688
2689         /* Step 2: clear flags for stateless addrconf */
2690         if (!how)
2691                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2692
2693 #ifdef CONFIG_IPV6_PRIVACY
2694         if (how && del_timer(&idev->regen_timer))
2695                 in6_dev_put(idev);
2696
2697         /* Step 3: clear tempaddr list */
2698         while (!list_empty(&idev->tempaddr_list)) {
2699                 ifa = list_first_entry(&idev->tempaddr_list,
2700                                        struct inet6_ifaddr, tmp_list);
2701                 list_del(&ifa->tmp_list);
2702                 write_unlock_bh(&idev->lock);
2703                 spin_lock_bh(&ifa->lock);
2704
2705                 if (ifa->ifpub) {
2706                         in6_ifa_put(ifa->ifpub);
2707                         ifa->ifpub = NULL;
2708                 }
2709                 spin_unlock_bh(&ifa->lock);
2710                 in6_ifa_put(ifa);
2711                 write_lock_bh(&idev->lock);
2712         }
2713 #endif
2714
2715         while (!list_empty(&idev->addr_list)) {
2716                 ifa = list_first_entry(&idev->addr_list,
2717                                        struct inet6_ifaddr, if_list);
2718                 addrconf_del_timer(ifa);
2719
2720                 /* If just doing link down, and address is permanent
2721                    and not link-local, then retain it. */
2722                 if (!how &&
2723                     (ifa->flags&IFA_F_PERMANENT) &&
2724                     !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2725                         list_move_tail(&ifa->if_list, &keep_list);
2726
2727                         /* If not doing DAD on this address, just keep it. */
2728                         if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2729                             idev->cnf.accept_dad <= 0 ||
2730                             (ifa->flags & IFA_F_NODAD))
2731                                 continue;
2732
2733                         /* If it was tentative already, no need to notify */
2734                         if (ifa->flags & IFA_F_TENTATIVE)
2735                                 continue;
2736
2737                         /* Flag it for later restoration when link comes up */
2738                         ifa->flags |= IFA_F_TENTATIVE;
2739                         ifa->state = INET6_IFADDR_STATE_DAD;
2740
2741                         write_unlock_bh(&idev->lock);
2742
2743                         in6_ifa_hold(ifa);
2744                 } else {
2745                         list_del(&ifa->if_list);
2746
2747                         /* clear hash table */
2748                         spin_lock_bh(&addrconf_hash_lock);
2749                         hlist_del_init_rcu(&ifa->addr_lst);
2750                         spin_unlock_bh(&addrconf_hash_lock);
2751
2752                         write_unlock_bh(&idev->lock);
2753                         spin_lock_bh(&ifa->state_lock);
2754                         state = ifa->state;
2755                         ifa->state = INET6_IFADDR_STATE_DEAD;
2756                         spin_unlock_bh(&ifa->state_lock);
2757
2758                         if (state == INET6_IFADDR_STATE_DEAD)
2759                                 goto put_ifa;
2760                 }
2761
2762                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2763                 if (ifa->state == INET6_IFADDR_STATE_DEAD)
2764                         atomic_notifier_call_chain(&inet6addr_chain,
2765                                                    NETDEV_DOWN, ifa);
2766
2767 put_ifa:
2768                 in6_ifa_put(ifa);
2769
2770                 write_lock_bh(&idev->lock);
2771         }
2772
2773         list_splice(&keep_list, &idev->addr_list);
2774
2775         write_unlock_bh(&idev->lock);
2776
2777         /* Step 5: Discard multicast list */
2778         if (how)
2779                 ipv6_mc_destroy_dev(idev);
2780         else
2781                 ipv6_mc_down(idev);
2782
2783         idev->tstamp = jiffies;
2784
2785         /* Last: Shot the device (if unregistered) */
2786         if (how) {
2787                 addrconf_sysctl_unregister(idev);
2788                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2789                 neigh_ifdown(&nd_tbl, dev);
2790                 in6_dev_put(idev);
2791         }
2792         return 0;
2793 }
2794
2795 static void addrconf_rs_timer(unsigned long data)
2796 {
2797         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2798         struct inet6_dev *idev = ifp->idev;
2799
2800         read_lock(&idev->lock);
2801         if (idev->dead || !(idev->if_flags & IF_READY))
2802                 goto out;
2803
2804         if (idev->cnf.forwarding)
2805                 goto out;
2806
2807         /* Announcement received after solicitation was sent */
2808         if (idev->if_flags & IF_RA_RCVD)
2809                 goto out;
2810
2811         spin_lock(&ifp->lock);
2812         if (ifp->probes++ < idev->cnf.rtr_solicits) {
2813                 /* The wait after the last probe can be shorter */
2814                 addrconf_mod_timer(ifp, AC_RS,
2815                                    (ifp->probes == idev->cnf.rtr_solicits) ?
2816                                    idev->cnf.rtr_solicit_delay :
2817                                    idev->cnf.rtr_solicit_interval);
2818                 spin_unlock(&ifp->lock);
2819
2820                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2821         } else {
2822                 spin_unlock(&ifp->lock);
2823                 /*
2824                  * Note: we do not support deprecated "all on-link"
2825                  * assumption any longer.
2826                  */
2827                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2828                        idev->dev->name);
2829         }
2830
2831 out:
2832         read_unlock(&idev->lock);
2833         in6_ifa_put(ifp);
2834 }
2835
2836 /*
2837  *      Duplicate Address Detection
2838  */
2839 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2840 {
2841         unsigned long rand_num;
2842         struct inet6_dev *idev = ifp->idev;
2843
2844         if (ifp->flags & IFA_F_OPTIMISTIC)
2845                 rand_num = 0;
2846         else
2847                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2848
2849         ifp->probes = idev->cnf.dad_transmits;
2850         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2851 }
2852
2853 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2854 {
2855         struct inet6_dev *idev = ifp->idev;
2856         struct net_device *dev = idev->dev;
2857
2858         addrconf_join_solict(dev, &ifp->addr);
2859
2860         net_srandom(ifp->addr.s6_addr32[3]);
2861
2862         read_lock_bh(&idev->lock);
2863         spin_lock(&ifp->lock);
2864         if (ifp->state == INET6_IFADDR_STATE_DEAD)
2865                 goto out;
2866
2867         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2868             idev->cnf.accept_dad < 1 ||
2869             !(ifp->flags&IFA_F_TENTATIVE) ||
2870             ifp->flags & IFA_F_NODAD) {
2871                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2872                 spin_unlock(&ifp->lock);
2873                 read_unlock_bh(&idev->lock);
2874
2875                 addrconf_dad_completed(ifp);
2876                 return;
2877         }
2878
2879         if (!(idev->if_flags & IF_READY)) {
2880                 spin_unlock(&ifp->lock);
2881                 read_unlock_bh(&idev->lock);
2882                 /*
2883                  * If the device is not ready:
2884                  * - keep it tentative if it is a permanent address.
2885                  * - otherwise, kill it.
2886                  */
2887                 in6_ifa_hold(ifp);
2888                 addrconf_dad_stop(ifp, 0);
2889                 return;
2890         }
2891
2892         /*
2893          * Optimistic nodes can start receiving
2894          * Frames right away
2895          */
2896         if (ifp->flags & IFA_F_OPTIMISTIC)
2897                 ip6_ins_rt(ifp->rt);
2898
2899         addrconf_dad_kick(ifp);
2900 out:
2901         spin_unlock(&ifp->lock);
2902         read_unlock_bh(&idev->lock);
2903 }
2904
2905 static void addrconf_dad_timer(unsigned long data)
2906 {
2907         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2908         struct inet6_dev *idev = ifp->idev;
2909         struct in6_addr mcaddr;
2910
2911         if (!ifp->probes && addrconf_dad_end(ifp))
2912                 goto out;
2913
2914         read_lock(&idev->lock);
2915         if (idev->dead || !(idev->if_flags & IF_READY)) {
2916                 read_unlock(&idev->lock);
2917                 goto out;
2918         }
2919
2920         spin_lock(&ifp->lock);
2921         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2922                 spin_unlock(&ifp->lock);
2923                 read_unlock(&idev->lock);
2924                 goto out;
2925         }
2926
2927         if (ifp->probes == 0) {
2928                 /*
2929                  * DAD was successful
2930                  */
2931
2932                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2933                 spin_unlock(&ifp->lock);
2934                 read_unlock(&idev->lock);
2935
2936                 addrconf_dad_completed(ifp);
2937
2938                 goto out;
2939         }
2940
2941         ifp->probes--;
2942         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2943         spin_unlock(&ifp->lock);
2944         read_unlock(&idev->lock);
2945
2946         /* send a neighbour solicitation for our addr */
2947         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2948         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2949 out:
2950         in6_ifa_put(ifp);
2951 }
2952
2953 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2954 {
2955         struct net_device *dev = ifp->idev->dev;
2956
2957         /*
2958          *      Configure the address for reception. Now it is valid.
2959          */
2960
2961         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2962
2963         /* If added prefix is link local and forwarding is off,
2964            start sending router solicitations.
2965          */
2966
2967         if ((ifp->idev->cnf.forwarding == 0 ||
2968              ifp->idev->cnf.forwarding == 2) &&
2969             ifp->idev->cnf.rtr_solicits > 0 &&
2970             (dev->flags&IFF_LOOPBACK) == 0 &&
2971             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2972                 /*
2973                  *      If a host as already performed a random delay
2974                  *      [...] as part of DAD [...] there is no need
2975                  *      to delay again before sending the first RS
2976                  */
2977                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2978
2979                 spin_lock_bh(&ifp->lock);
2980                 ifp->probes = 1;
2981                 ifp->idev->if_flags |= IF_RS_SENT;
2982                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2983                 spin_unlock_bh(&ifp->lock);
2984         }
2985 }
2986
2987 static void addrconf_dad_run(struct inet6_dev *idev)
2988 {
2989         struct inet6_ifaddr *ifp;
2990
2991         read_lock_bh(&idev->lock);
2992         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2993                 spin_lock(&ifp->lock);
2994                 if (ifp->flags & IFA_F_TENTATIVE &&
2995                     ifp->state == INET6_IFADDR_STATE_DAD)
2996                         addrconf_dad_kick(ifp);
2997                 spin_unlock(&ifp->lock);
2998         }
2999         read_unlock_bh(&idev->lock);
3000 }
3001
3002 #ifdef CONFIG_PROC_FS
3003 struct if6_iter_state {
3004         struct seq_net_private p;
3005         int bucket;
3006 };
3007
3008 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3009 {
3010         struct inet6_ifaddr *ifa = NULL;
3011         struct if6_iter_state *state = seq->private;
3012         struct net *net = seq_file_net(seq);
3013
3014         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3015                 struct hlist_node *n;
3016                 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3017                                          addr_lst)
3018                         if (net_eq(dev_net(ifa->idev->dev), net))
3019                                 return ifa;
3020         }
3021         return NULL;
3022 }
3023
3024 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3025                                          struct inet6_ifaddr *ifa)
3026 {
3027         struct if6_iter_state *state = seq->private;
3028         struct net *net = seq_file_net(seq);
3029         struct hlist_node *n = &ifa->addr_lst;
3030
3031         hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3032                 if (net_eq(dev_net(ifa->idev->dev), net))
3033                         return ifa;
3034
3035         while (++state->bucket < IN6_ADDR_HSIZE) {
3036                 hlist_for_each_entry_rcu_bh(ifa, n,
3037                                      &inet6_addr_lst[state->bucket], addr_lst) {
3038                         if (net_eq(dev_net(ifa->idev->dev), net))
3039                                 return ifa;
3040                 }
3041         }
3042
3043         return NULL;
3044 }
3045
3046 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3047 {
3048         struct inet6_ifaddr *ifa = if6_get_first(seq);
3049
3050         if (ifa)
3051                 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3052                         --pos;
3053         return pos ? NULL : ifa;
3054 }
3055
3056 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3057         __acquires(rcu_bh)
3058 {
3059         rcu_read_lock_bh();
3060         return if6_get_idx(seq, *pos);
3061 }
3062
3063 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3064 {
3065         struct inet6_ifaddr *ifa;
3066
3067         ifa = if6_get_next(seq, v);
3068         ++*pos;
3069         return ifa;
3070 }
3071
3072 static void if6_seq_stop(struct seq_file *seq, void *v)
3073         __releases(rcu_bh)
3074 {
3075         rcu_read_unlock_bh();
3076 }
3077
3078 static int if6_seq_show(struct seq_file *seq, void *v)
3079 {
3080         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3081         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3082                    &ifp->addr,
3083                    ifp->idev->dev->ifindex,
3084                    ifp->prefix_len,
3085                    ifp->scope,
3086                    ifp->flags,
3087                    ifp->idev->dev->name);
3088         return 0;
3089 }
3090
3091 static const struct seq_operations if6_seq_ops = {
3092         .start  = if6_seq_start,
3093         .next   = if6_seq_next,
3094         .show   = if6_seq_show,
3095         .stop   = if6_seq_stop,
3096 };
3097
3098 static int if6_seq_open(struct inode *inode, struct file *file)
3099 {
3100         return seq_open_net(inode, file, &if6_seq_ops,
3101                             sizeof(struct if6_iter_state));
3102 }
3103
3104 static const struct file_operations if6_fops = {
3105         .owner          = THIS_MODULE,
3106         .open           = if6_seq_open,
3107         .read           = seq_read,
3108         .llseek         = seq_lseek,
3109         .release        = seq_release_net,
3110 };
3111
3112 static int __net_init if6_proc_net_init(struct net *net)
3113 {
3114         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3115                 return -ENOMEM;
3116         return 0;
3117 }
3118
3119 static void __net_exit if6_proc_net_exit(struct net *net)
3120 {
3121        proc_net_remove(net, "if_inet6");
3122 }
3123
3124 static struct pernet_operations if6_proc_net_ops = {
3125        .init = if6_proc_net_init,
3126        .exit = if6_proc_net_exit,
3127 };
3128
3129 int __init if6_proc_init(void)
3130 {
3131         return register_pernet_subsys(&if6_proc_net_ops);
3132 }
3133
3134 void if6_proc_exit(void)
3135 {
3136         unregister_pernet_subsys(&if6_proc_net_ops);
3137 }
3138 #endif  /* CONFIG_PROC_FS */
3139
3140 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3141 /* Check if address is a home address configured on any interface. */
3142 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3143 {
3144         int ret = 0;
3145         struct inet6_ifaddr *ifp = NULL;
3146         struct hlist_node *n;
3147         unsigned int hash = ipv6_addr_hash(addr);
3148
3149         rcu_read_lock_bh();
3150         hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3151                 if (!net_eq(dev_net(ifp->idev->dev), net))
3152                         continue;
3153                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3154                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3155                         ret = 1;
3156                         break;
3157                 }
3158         }
3159         rcu_read_unlock_bh();
3160         return ret;
3161 }
3162 #endif
3163
3164 /*
3165  *      Periodic address status verification
3166  */
3167
3168 static void addrconf_verify(unsigned long foo)
3169 {
3170         unsigned long now, next, next_sec, next_sched;
3171         struct inet6_ifaddr *ifp;
3172         struct hlist_node *node;
3173         int i;
3174
3175         rcu_read_lock_bh();
3176         spin_lock(&addrconf_verify_lock);
3177         now = jiffies;
3178         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3179
3180         del_timer(&addr_chk_timer);
3181
3182         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3183 restart:
3184                 hlist_for_each_entry_rcu_bh(ifp, node,
3185                                          &inet6_addr_lst[i], addr_lst) {
3186                         unsigned long age;
3187
3188                         if (ifp->flags & IFA_F_PERMANENT)
3189                                 continue;
3190
3191                         spin_lock(&ifp->lock);
3192                         /* We try to batch several events at once. */
3193                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3194
3195                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3196                             age >= ifp->valid_lft) {
3197                                 spin_unlock(&ifp->lock);
3198                                 in6_ifa_hold(ifp);
3199                                 ipv6_del_addr(ifp);
3200                                 goto restart;
3201                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3202                                 spin_unlock(&ifp->lock);
3203                                 continue;
3204                         } else if (age >= ifp->prefered_lft) {
3205                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3206                                 int deprecate = 0;
3207
3208                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3209                                         deprecate = 1;
3210                                         ifp->flags |= IFA_F_DEPRECATED;
3211                                 }
3212
3213                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3214                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3215
3216                                 spin_unlock(&ifp->lock);
3217
3218                                 if (deprecate) {
3219                                         in6_ifa_hold(ifp);
3220
3221                                         ipv6_ifa_notify(0, ifp);
3222                                         in6_ifa_put(ifp);
3223                                         goto restart;
3224                                 }
3225 #ifdef CONFIG_IPV6_PRIVACY
3226                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3227                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3228                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3229                                         ifp->idev->cnf.dad_transmits *
3230                                         ifp->idev->nd_parms->retrans_time / HZ;
3231
3232                                 if (age >= ifp->prefered_lft - regen_advance) {
3233                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3234                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3235                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3236                                         if (!ifp->regen_count && ifpub) {
3237                                                 ifp->regen_count++;
3238                                                 in6_ifa_hold(ifp);
3239                                                 in6_ifa_hold(ifpub);
3240                                                 spin_unlock(&ifp->lock);
3241
3242                                                 spin_lock(&ifpub->lock);
3243                                                 ifpub->regen_count = 0;
3244                                                 spin_unlock(&ifpub->lock);
3245                                                 ipv6_create_tempaddr(ifpub, ifp);
3246                                                 in6_ifa_put(ifpub);
3247                                                 in6_ifa_put(ifp);
3248                                                 goto restart;
3249                                         }
3250                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3251                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3252                                 spin_unlock(&ifp->lock);
3253 #endif
3254                         } else {
3255                                 /* ifp->prefered_lft <= ifp->valid_lft */
3256                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3257                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3258                                 spin_unlock(&ifp->lock);
3259                         }
3260                 }
3261         }
3262
3263         next_sec = round_jiffies_up(next);
3264         next_sched = next;
3265
3266         /* If rounded timeout is accurate enough, accept it. */
3267         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3268                 next_sched = next_sec;
3269
3270         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3271         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3272                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3273
3274         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3275               now, next, next_sec, next_sched));
3276
3277         addr_chk_timer.expires = next_sched;
3278         add_timer(&addr_chk_timer);
3279         spin_unlock(&addrconf_verify_lock);
3280         rcu_read_unlock_bh();
3281 }
3282
3283 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3284 {
3285         struct in6_addr *pfx = NULL;
3286
3287         if (addr)
3288                 pfx = nla_data(addr);
3289
3290         if (local) {
3291                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3292                         pfx = NULL;
3293                 else
3294                         pfx = nla_data(local);
3295         }
3296
3297         return pfx;
3298 }
3299
3300 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3301         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3302         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3303         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3304 };
3305
3306 static int
3307 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3308 {
3309         struct net *net = sock_net(skb->sk);
3310         struct ifaddrmsg *ifm;
3311         struct nlattr *tb[IFA_MAX+1];
3312         struct in6_addr *pfx;
3313         int err;
3314
3315         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3316         if (err < 0)
3317                 return err;
3318
3319         ifm = nlmsg_data(nlh);
3320         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3321         if (pfx == NULL)
3322                 return -EINVAL;
3323
3324         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3325 }
3326
3327 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3328                              u32 prefered_lft, u32 valid_lft)
3329 {
3330         u32 flags;
3331         clock_t expires;
3332         unsigned long timeout;
3333
3334         if (!valid_lft || (prefered_lft > valid_lft))
3335                 return -EINVAL;
3336
3337         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3338         if (addrconf_finite_timeout(timeout)) {
3339                 expires = jiffies_to_clock_t(timeout * HZ);
3340                 valid_lft = timeout;
3341                 flags = RTF_EXPIRES;
3342         } else {
3343                 expires = 0;
3344                 flags = 0;
3345                 ifa_flags |= IFA_F_PERMANENT;
3346         }
3347
3348         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3349         if (addrconf_finite_timeout(timeout)) {
3350                 if (timeout == 0)
3351                         ifa_flags |= IFA_F_DEPRECATED;
3352                 prefered_lft = timeout;
3353         }
3354
3355         spin_lock_bh(&ifp->lock);
3356         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3357         ifp->tstamp = jiffies;
3358         ifp->valid_lft = valid_lft;
3359         ifp->prefered_lft = prefered_lft;
3360
3361         spin_unlock_bh(&ifp->lock);
3362         if (!(ifp->flags&IFA_F_TENTATIVE))
3363                 ipv6_ifa_notify(0, ifp);
3364
3365         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3366                               expires, flags);
3367         addrconf_verify(0);
3368
3369         return 0;
3370 }
3371
3372 static int
3373 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3374 {
3375         struct net *net = sock_net(skb->sk);
3376         struct ifaddrmsg *ifm;
3377         struct nlattr *tb[IFA_MAX+1];
3378         struct in6_addr *pfx;
3379         struct inet6_ifaddr *ifa;
3380         struct net_device *dev;
3381         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3382         u8 ifa_flags;
3383         int err;
3384
3385         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3386         if (err < 0)
3387                 return err;
3388
3389         ifm = nlmsg_data(nlh);
3390         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3391         if (pfx == NULL)
3392                 return -EINVAL;
3393
3394         if (tb[IFA_CACHEINFO]) {
3395                 struct ifa_cacheinfo *ci;
3396
3397                 ci = nla_data(tb[IFA_CACHEINFO]);
3398                 valid_lft = ci->ifa_valid;
3399                 preferred_lft = ci->ifa_prefered;
3400         } else {
3401                 preferred_lft = INFINITY_LIFE_TIME;
3402                 valid_lft = INFINITY_LIFE_TIME;
3403         }
3404
3405         dev =  __dev_get_by_index(net, ifm->ifa_index);
3406         if (dev == NULL)
3407                 return -ENODEV;
3408
3409         /* We ignore other flags so far. */
3410         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3411
3412         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3413         if (ifa == NULL) {
3414                 /*
3415                  * It would be best to check for !NLM_F_CREATE here but
3416                  * userspace alreay relies on not having to provide this.
3417                  */
3418                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3419                                       ifm->ifa_prefixlen, ifa_flags,
3420                                       preferred_lft, valid_lft);
3421         }
3422
3423         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3424             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3425                 err = -EEXIST;
3426         else
3427                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3428
3429         in6_ifa_put(ifa);
3430
3431         return err;
3432 }
3433
3434 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3435                           u8 scope, int ifindex)
3436 {
3437         struct ifaddrmsg *ifm;
3438
3439         ifm = nlmsg_data(nlh);
3440         ifm->ifa_family = AF_INET6;
3441         ifm->ifa_prefixlen = prefixlen;
3442         ifm->ifa_flags = flags;
3443         ifm->ifa_scope = scope;
3444         ifm->ifa_index = ifindex;
3445 }
3446
3447 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3448                          unsigned long tstamp, u32 preferred, u32 valid)
3449 {
3450         struct ifa_cacheinfo ci;
3451
3452         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3453                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3454         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3455                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3456         ci.ifa_prefered = preferred;
3457         ci.ifa_valid = valid;
3458
3459         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3460 }
3461
3462 static inline int rt_scope(int ifa_scope)
3463 {
3464         if (ifa_scope & IFA_HOST)
3465                 return RT_SCOPE_HOST;
3466         else if (ifa_scope & IFA_LINK)
3467                 return RT_SCOPE_LINK;
3468         else if (ifa_scope & IFA_SITE)
3469                 return RT_SCOPE_SITE;
3470         else
3471                 return RT_SCOPE_UNIVERSE;
3472 }
3473
3474 static inline int inet6_ifaddr_msgsize(void)
3475 {
3476         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3477                + nla_total_size(16) /* IFA_ADDRESS */
3478                + nla_total_size(sizeof(struct ifa_cacheinfo));
3479 }
3480
3481 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3482                              u32 pid, u32 seq, int event, unsigned int flags)
3483 {
3484         struct nlmsghdr  *nlh;
3485         u32 preferred, valid;
3486
3487         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3488         if (nlh == NULL)
3489                 return -EMSGSIZE;
3490
3491         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3492                       ifa->idev->dev->ifindex);
3493
3494         if (!(ifa->flags&IFA_F_PERMANENT)) {
3495                 preferred = ifa->prefered_lft;
3496                 valid = ifa->valid_lft;
3497                 if (preferred != INFINITY_LIFE_TIME) {
3498                         long tval = (jiffies - ifa->tstamp)/HZ;
3499                         if (preferred > tval)
3500                                 preferred -= tval;
3501                         else
3502                                 preferred = 0;
3503                         if (valid != INFINITY_LIFE_TIME) {
3504                                 if (valid > tval)
3505                                         valid -= tval;
3506                                 else
3507                                         valid = 0;
3508                         }
3509                 }
3510         } else {
3511                 preferred = INFINITY_LIFE_TIME;
3512                 valid = INFINITY_LIFE_TIME;
3513         }
3514
3515         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3516             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3517                 nlmsg_cancel(skb, nlh);
3518                 return -EMSGSIZE;
3519         }
3520
3521         return nlmsg_end(skb, nlh);
3522 }
3523
3524 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3525                                 u32 pid, u32 seq, int event, u16 flags)
3526 {
3527         struct nlmsghdr  *nlh;
3528         u8 scope = RT_SCOPE_UNIVERSE;
3529         int ifindex = ifmca->idev->dev->ifindex;
3530
3531         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3532                 scope = RT_SCOPE_SITE;
3533
3534         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3535         if (nlh == NULL)
3536                 return -EMSGSIZE;
3537
3538         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3539         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3540             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3541                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3542                 nlmsg_cancel(skb, nlh);
3543                 return -EMSGSIZE;
3544         }
3545
3546         return nlmsg_end(skb, nlh);
3547 }
3548
3549 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3550                                 u32 pid, u32 seq, int event, unsigned int flags)
3551 {
3552         struct nlmsghdr  *nlh;
3553         u8 scope = RT_SCOPE_UNIVERSE;
3554         int ifindex = ifaca->aca_idev->dev->ifindex;
3555
3556         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3557                 scope = RT_SCOPE_SITE;
3558
3559         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3560         if (nlh == NULL)
3561                 return -EMSGSIZE;
3562
3563         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3564         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3565             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3566                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3567                 nlmsg_cancel(skb, nlh);
3568                 return -EMSGSIZE;
3569         }
3570
3571         return nlmsg_end(skb, nlh);
3572 }
3573
3574 enum addr_type_t {
3575         UNICAST_ADDR,
3576         MULTICAST_ADDR,
3577         ANYCAST_ADDR,
3578 };
3579
3580 /* called with rcu_read_lock() */
3581 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3582                           struct netlink_callback *cb, enum addr_type_t type,
3583                           int s_ip_idx, int *p_ip_idx)
3584 {
3585         struct ifmcaddr6 *ifmca;
3586         struct ifacaddr6 *ifaca;
3587         int err = 1;
3588         int ip_idx = *p_ip_idx;
3589
3590         read_lock_bh(&idev->lock);
3591         switch (type) {
3592         case UNICAST_ADDR: {
3593                 struct inet6_ifaddr *ifa;
3594
3595                 /* unicast address incl. temp addr */
3596                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3597                         if (++ip_idx < s_ip_idx)
3598                                 continue;
3599                         err = inet6_fill_ifaddr(skb, ifa,
3600                                                 NETLINK_CB(cb->skb).pid,
3601                                                 cb->nlh->nlmsg_seq,
3602                                                 RTM_NEWADDR,
3603                                                 NLM_F_MULTI);
3604                         if (err <= 0)
3605                                 break;
3606                 }
3607                 break;
3608         }
3609         case MULTICAST_ADDR:
3610                 /* multicast address */
3611                 for (ifmca = idev->mc_list; ifmca;
3612                      ifmca = ifmca->next, ip_idx++) {
3613                         if (ip_idx < s_ip_idx)
3614                                 continue;
3615                         err = inet6_fill_ifmcaddr(skb, ifmca,
3616                                                   NETLINK_CB(cb->skb).pid,
3617                                                   cb->nlh->nlmsg_seq,
3618                                                   RTM_GETMULTICAST,
3619                                                   NLM_F_MULTI);
3620                         if (err <= 0)
3621                                 break;
3622                 }
3623                 break;
3624         case ANYCAST_ADDR:
3625                 /* anycast address */
3626                 for (ifaca = idev->ac_list; ifaca;
3627                      ifaca = ifaca->aca_next, ip_idx++) {
3628                         if (ip_idx < s_ip_idx)
3629                                 continue;
3630                         err = inet6_fill_ifacaddr(skb, ifaca,
3631                                                   NETLINK_CB(cb->skb).pid,
3632                                                   cb->nlh->nlmsg_seq,
3633                                                   RTM_GETANYCAST,
3634                                                   NLM_F_MULTI);
3635                         if (err <= 0)
3636                                 break;
3637                 }
3638                 break;
3639         default:
3640                 break;
3641         }
3642         read_unlock_bh(&idev->lock);
3643         *p_ip_idx = ip_idx;
3644         return err;
3645 }
3646
3647 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3648                            enum addr_type_t type)
3649 {
3650         struct net *net = sock_net(skb->sk);
3651         int h, s_h;
3652         int idx, ip_idx;
3653         int s_idx, s_ip_idx;
3654         struct net_device *dev;
3655         struct inet6_dev *idev;
3656         struct hlist_head *head;
3657         struct hlist_node *node;
3658
3659         s_h = cb->args[0];
3660         s_idx = idx = cb->args[1];
3661         s_ip_idx = ip_idx = cb->args[2];
3662
3663         rcu_read_lock();
3664         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3665                 idx = 0;
3666                 head = &net->dev_index_head[h];
3667                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3668                         if (idx < s_idx)
3669                                 goto cont;
3670                         if (h > s_h || idx > s_idx)
3671                                 s_ip_idx = 0;
3672                         ip_idx = 0;
3673                         idev = __in6_dev_get(dev);
3674                         if (!idev)
3675                                 goto cont;
3676
3677                         if (in6_dump_addrs(idev, skb, cb, type,
3678                                            s_ip_idx, &ip_idx) <= 0)
3679                                 goto done;
3680 cont:
3681                         idx++;
3682                 }
3683         }
3684 done:
3685         rcu_read_unlock();
3686         cb->args[0] = h;
3687         cb->args[1] = idx;
3688         cb->args[2] = ip_idx;
3689
3690         return skb->len;
3691 }
3692
3693 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3694 {
3695         enum addr_type_t type = UNICAST_ADDR;
3696
3697         return inet6_dump_addr(skb, cb, type);
3698 }
3699
3700 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3701 {
3702         enum addr_type_t type = MULTICAST_ADDR;
3703
3704         return inet6_dump_addr(skb, cb, type);
3705 }
3706
3707
3708 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3709 {
3710         enum addr_type_t type = ANYCAST_ADDR;
3711
3712         return inet6_dump_addr(skb, cb, type);
3713 }
3714
3715 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3716                              void *arg)
3717 {
3718         struct net *net = sock_net(in_skb->sk);
3719         struct ifaddrmsg *ifm;
3720         struct nlattr *tb[IFA_MAX+1];
3721         struct in6_addr *addr = NULL;
3722         struct net_device *dev = NULL;
3723         struct inet6_ifaddr *ifa;
3724         struct sk_buff *skb;
3725         int err;
3726
3727         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3728         if (err < 0)
3729                 goto errout;
3730
3731         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3732         if (addr == NULL) {
3733                 err = -EINVAL;
3734                 goto errout;
3735         }
3736
3737         ifm = nlmsg_data(nlh);
3738         if (ifm->ifa_index)
3739                 dev = __dev_get_by_index(net, ifm->ifa_index);
3740
3741         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3742         if (!ifa) {
3743                 err = -EADDRNOTAVAIL;
3744                 goto errout;
3745         }
3746
3747         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3748         if (!skb) {
3749                 err = -ENOBUFS;
3750                 goto errout_ifa;
3751         }
3752
3753         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3754                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3755         if (err < 0) {
3756                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3757                 WARN_ON(err == -EMSGSIZE);
3758                 kfree_skb(skb);
3759                 goto errout_ifa;
3760         }
3761         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3762 errout_ifa:
3763         in6_ifa_put(ifa);
3764 errout:
3765         return err;
3766 }
3767
3768 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3769 {
3770         struct sk_buff *skb;
3771         struct net *net = dev_net(ifa->idev->dev);
3772         int err = -ENOBUFS;
3773
3774         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3775         if (skb == NULL)
3776                 goto errout;
3777
3778         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3779         if (err < 0) {
3780                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3781                 WARN_ON(err == -EMSGSIZE);
3782                 kfree_skb(skb);
3783                 goto errout;
3784         }
3785         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3786         return;
3787 errout:
3788         if (err < 0)
3789                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3790 }
3791
3792 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3793                                 __s32 *array, int bytes)
3794 {
3795         BUG_ON(bytes < (DEVCONF_MAX * 4));
3796
3797         memset(array, 0, bytes);
3798         array[DEVCONF_FORWARDING] = cnf->forwarding;
3799         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3800         array[DEVCONF_MTU6] = cnf->mtu6;
3801         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3802         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3803         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3804         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3805         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3806         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3807         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3808         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3809 #ifdef CONFIG_IPV6_PRIVACY
3810         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3811         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3812         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3813         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3814         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3815 #endif
3816         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3817         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3818         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3819 #ifdef CONFIG_IPV6_ROUTER_PREF
3820         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3821         array[DEVCONF_RTR_PROBE_INTERVAL] = 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_if_nlmsg_size(void)
3840 {
3841         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3842                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3843                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3844                + nla_total_size(4) /* IFLA_MTU */
3845                + nla_total_size(4) /* IFLA_LINK */
3846                + nla_total_size( /* IFLA_PROTINFO */
3847                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3848                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3849                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3850                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3851                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3852                  );
3853 }
3854
3855 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3856                                       int items, int bytes)
3857 {
3858         int i;
3859         int pad = bytes - sizeof(u64) * items;
3860         BUG_ON(pad < 0);
3861
3862         /* Use put_unaligned() because stats may not be aligned for u64. */
3863         put_unaligned(items, &stats[0]);
3864         for (i = 1; i < items; i++)
3865                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3866
3867         memset(&stats[items], 0, pad);
3868 }
3869
3870 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3871                                       int items, int bytes, size_t syncpoff)
3872 {
3873         int i;
3874         int pad = bytes - sizeof(u64) * items;
3875         BUG_ON(pad < 0);
3876
3877         /* Use put_unaligned() because stats may not be aligned for u64. */
3878         put_unaligned(items, &stats[0]);
3879         for (i = 1; i < items; i++)
3880                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3881
3882         memset(&stats[items], 0, pad);
3883 }
3884
3885 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3886                              int bytes)
3887 {
3888         switch (attrtype) {
3889         case IFLA_INET6_STATS:
3890                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3891                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3892                 break;
3893         case IFLA_INET6_ICMP6STATS:
3894                 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3895                 break;
3896         }
3897 }
3898
3899 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3900                              u32 pid, u32 seq, int event, unsigned int flags)
3901 {
3902         struct net_device *dev = idev->dev;
3903         struct nlattr *nla;
3904         struct ifinfomsg *hdr;
3905         struct nlmsghdr *nlh;
3906         void *protoinfo;
3907         struct ifla_cacheinfo ci;
3908
3909         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3910         if (nlh == NULL)
3911                 return -EMSGSIZE;
3912
3913         hdr = nlmsg_data(nlh);
3914         hdr->ifi_family = AF_INET6;
3915         hdr->__ifi_pad = 0;
3916         hdr->ifi_type = dev->type;
3917         hdr->ifi_index = dev->ifindex;
3918         hdr->ifi_flags = dev_get_flags(dev);
3919         hdr->ifi_change = 0;
3920
3921         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3922
3923         if (dev->addr_len)
3924                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3925
3926         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3927         if (dev->ifindex != dev->iflink)
3928                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3929
3930         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3931         if (protoinfo == NULL)
3932                 goto nla_put_failure;
3933
3934         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3935
3936         ci.max_reasm_len = IPV6_MAXPLEN;
3937         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3938                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3939         ci.reachable_time = idev->nd_parms->reachable_time;
3940         ci.retrans_time = idev->nd_parms->retrans_time;
3941         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3942
3943         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3944         if (nla == NULL)
3945                 goto nla_put_failure;
3946         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3947
3948         /* XXX - MC not implemented */
3949
3950         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3951         if (nla == NULL)
3952                 goto nla_put_failure;
3953         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3954
3955         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3956         if (nla == NULL)
3957                 goto nla_put_failure;
3958         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3959
3960         nla_nest_end(skb, protoinfo);
3961         return nlmsg_end(skb, nlh);
3962
3963 nla_put_failure:
3964         nlmsg_cancel(skb, nlh);
3965         return -EMSGSIZE;
3966 }
3967
3968 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3969 {
3970         struct net *net = sock_net(skb->sk);
3971         int h, s_h;
3972         int idx = 0, s_idx;
3973         struct net_device *dev;
3974         struct inet6_dev *idev;
3975         struct hlist_head *head;
3976         struct hlist_node *node;
3977
3978         s_h = cb->args[0];
3979         s_idx = cb->args[1];
3980
3981         rcu_read_lock();
3982         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3983                 idx = 0;
3984                 head = &net->dev_index_head[h];
3985                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3986                         if (idx < s_idx)
3987                                 goto cont;
3988                         idev = __in6_dev_get(dev);
3989                         if (!idev)
3990                                 goto cont;
3991                         if (inet6_fill_ifinfo(skb, idev,
3992                                               NETLINK_CB(cb->skb).pid,
3993                                               cb->nlh->nlmsg_seq,
3994                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
3995                                 goto out;
3996 cont:
3997                         idx++;
3998                 }
3999         }
4000 out:
4001         rcu_read_unlock();
4002         cb->args[1] = idx;
4003         cb->args[0] = h;
4004
4005         return skb->len;
4006 }
4007
4008 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4009 {
4010         struct sk_buff *skb;
4011         struct net *net = dev_net(idev->dev);
4012         int err = -ENOBUFS;
4013
4014         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4015         if (skb == NULL)
4016                 goto errout;
4017
4018         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4019         if (err < 0) {
4020                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4021                 WARN_ON(err == -EMSGSIZE);
4022                 kfree_skb(skb);
4023                 goto errout;
4024         }
4025         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4026         return;
4027 errout:
4028         if (err < 0)
4029                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4030 }
4031
4032 static inline size_t inet6_prefix_nlmsg_size(void)
4033 {
4034         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4035                + nla_total_size(sizeof(struct in6_addr))
4036                + nla_total_size(sizeof(struct prefix_cacheinfo));
4037 }
4038
4039 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4040                              struct prefix_info *pinfo, u32 pid, u32 seq,
4041                              int event, unsigned int flags)
4042 {
4043         struct prefixmsg *pmsg;
4044         struct nlmsghdr *nlh;
4045         struct prefix_cacheinfo ci;
4046
4047         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4048         if (nlh == NULL)
4049                 return -EMSGSIZE;
4050
4051         pmsg = nlmsg_data(nlh);
4052         pmsg->prefix_family = AF_INET6;
4053         pmsg->prefix_pad1 = 0;
4054         pmsg->prefix_pad2 = 0;
4055         pmsg->prefix_ifindex = idev->dev->ifindex;
4056         pmsg->prefix_len = pinfo->prefix_len;
4057         pmsg->prefix_type = pinfo->type;
4058         pmsg->prefix_pad3 = 0;
4059         pmsg->prefix_flags = 0;
4060         if (pinfo->onlink)
4061                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4062         if (pinfo->autoconf)
4063                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4064
4065         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4066
4067         ci.preferred_time = ntohl(pinfo->prefered);
4068         ci.valid_time = ntohl(pinfo->valid);
4069         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4070
4071         return nlmsg_end(skb, nlh);
4072
4073 nla_put_failure:
4074         nlmsg_cancel(skb, nlh);
4075         return -EMSGSIZE;
4076 }
4077
4078 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4079                          struct prefix_info *pinfo)
4080 {
4081         struct sk_buff *skb;
4082         struct net *net = dev_net(idev->dev);
4083         int err = -ENOBUFS;
4084
4085         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4086         if (skb == NULL)
4087                 goto errout;
4088
4089         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4090         if (err < 0) {
4091                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4092                 WARN_ON(err == -EMSGSIZE);
4093                 kfree_skb(skb);
4094                 goto errout;
4095         }
4096         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4097         return;
4098 errout:
4099         if (err < 0)
4100                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4101 }
4102
4103 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4104 {
4105         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4106
4107         switch (event) {
4108         case RTM_NEWADDR:
4109                 /*
4110                  * If the address was optimistic
4111                  * we inserted the route at the start of
4112                  * our DAD process, so we don't need
4113                  * to do it again
4114                  */
4115                 if (!(ifp->rt->rt6i_node))
4116                         ip6_ins_rt(ifp->rt);
4117                 if (ifp->idev->cnf.forwarding)
4118                         addrconf_join_anycast(ifp);
4119                 break;
4120         case RTM_DELADDR:
4121                 if (ifp->idev->cnf.forwarding)
4122                         addrconf_leave_anycast(ifp);
4123                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4124                 dst_hold(&ifp->rt->dst);
4125
4126                 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4127                     ip6_del_rt(ifp->rt))
4128                         dst_free(&ifp->rt->dst);
4129                 break;
4130         }
4131 }
4132
4133 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4134 {
4135         rcu_read_lock_bh();
4136         if (likely(ifp->idev->dead == 0))
4137                 __ipv6_ifa_notify(event, ifp);
4138         rcu_read_unlock_bh();
4139 }
4140
4141 #ifdef CONFIG_SYSCTL
4142
4143 static
4144 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4145                            void __user *buffer, size_t *lenp, loff_t *ppos)
4146 {
4147         int *valp = ctl->data;
4148         int val = *valp;
4149         loff_t pos = *ppos;
4150         int ret;
4151
4152         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4153
4154         if (write)
4155                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4156         if (ret)
4157                 *ppos = pos;
4158         return ret;
4159 }
4160
4161 static void dev_disable_change(struct inet6_dev *idev)
4162 {
4163         if (!idev || !idev->dev)
4164                 return;
4165
4166         if (idev->cnf.disable_ipv6)
4167                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4168         else
4169                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4170 }
4171
4172 static void addrconf_disable_change(struct net *net, __s32 newf)
4173 {
4174         struct net_device *dev;
4175         struct inet6_dev *idev;
4176
4177         rcu_read_lock();
4178         for_each_netdev_rcu(net, dev) {
4179                 idev = __in6_dev_get(dev);
4180                 if (idev) {
4181                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4182                         idev->cnf.disable_ipv6 = newf;
4183                         if (changed)
4184                                 dev_disable_change(idev);
4185                 }
4186         }
4187         rcu_read_unlock();
4188 }
4189
4190 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4191 {
4192         struct net *net;
4193
4194         net = (struct net *)table->extra2;
4195
4196         if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4197                 return 0;
4198
4199         if (!rtnl_trylock()) {
4200                 /* Restore the original values before restarting */
4201                 *p = old;
4202                 return restart_syscall();
4203         }
4204
4205         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4206                 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4207                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4208                 addrconf_disable_change(net, newf);
4209         } else if ((!*p) ^ (!old))
4210                 dev_disable_change((struct inet6_dev *)table->extra1);
4211
4212         rtnl_unlock();
4213         return 0;
4214 }
4215
4216 static
4217 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4218                             void __user *buffer, size_t *lenp, loff_t *ppos)
4219 {
4220         int *valp = ctl->data;
4221         int val = *valp;
4222         loff_t pos = *ppos;
4223         int ret;
4224
4225         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4226
4227         if (write)
4228                 ret = addrconf_disable_ipv6(ctl, valp, val);
4229         if (ret)
4230                 *ppos = pos;
4231         return ret;
4232 }
4233
4234 static struct addrconf_sysctl_table
4235 {
4236         struct ctl_table_header *sysctl_header;
4237         ctl_table addrconf_vars[DEVCONF_MAX+1];
4238         char *dev_name;
4239 } addrconf_sysctl __read_mostly = {
4240         .sysctl_header = NULL,
4241         .addrconf_vars = {
4242                 {
4243                         .procname       = "forwarding",
4244                         .data           = &ipv6_devconf.forwarding,
4245                         .maxlen         = sizeof(int),
4246                         .mode           = 0644,
4247                         .proc_handler   = addrconf_sysctl_forward,
4248                 },
4249                 {
4250                         .procname       = "hop_limit",
4251                         .data           = &ipv6_devconf.hop_limit,
4252                         .maxlen         = sizeof(int),
4253                         .mode           = 0644,
4254                         .proc_handler   = proc_dointvec,
4255                 },
4256                 {
4257                         .procname       = "mtu",
4258                         .data           = &ipv6_devconf.mtu6,
4259                         .maxlen         = sizeof(int),
4260                         .mode           = 0644,
4261                         .proc_handler   = proc_dointvec,
4262                 },
4263                 {
4264                         .procname       = "accept_ra",
4265                         .data           = &ipv6_devconf.accept_ra,
4266                         .maxlen         = sizeof(int),
4267                         .mode           = 0644,
4268                         .proc_handler   = proc_dointvec,
4269                 },
4270                 {
4271                         .procname       = "accept_redirects",
4272                         .data           = &ipv6_devconf.accept_redirects,
4273                         .maxlen         = sizeof(int),
4274                         .mode           = 0644,
4275                         .proc_handler   = proc_dointvec,
4276                 },
4277                 {
4278                         .procname       = "autoconf",
4279                         .data           = &ipv6_devconf.autoconf,
4280                         .maxlen         = sizeof(int),
4281                         .mode           = 0644,
4282                         .proc_handler   = proc_dointvec,
4283                 },
4284                 {
4285                         .procname       = "dad_transmits",
4286                         .data           = &ipv6_devconf.dad_transmits,
4287                         .maxlen         = sizeof(int),
4288                         .mode           = 0644,
4289                         .proc_handler   = proc_dointvec,
4290                 },
4291                 {
4292                         .procname       = "router_solicitations",
4293                         .data           = &ipv6_devconf.rtr_solicits,
4294                         .maxlen         = sizeof(int),
4295                         .mode           = 0644,
4296                         .proc_handler   = proc_dointvec,
4297                 },
4298                 {
4299                         .procname       = "router_solicitation_interval",
4300                         .data           = &ipv6_devconf.rtr_solicit_interval,
4301                         .maxlen         = sizeof(int),
4302                         .mode           = 0644,
4303                         .proc_handler   = proc_dointvec_jiffies,
4304                 },
4305                 {
4306                         .procname       = "router_solicitation_delay",
4307                         .data           = &ipv6_devconf.rtr_solicit_delay,
4308                         .maxlen         = sizeof(int),
4309                         .mode           = 0644,
4310                         .proc_handler   = proc_dointvec_jiffies,
4311                 },
4312                 {
4313                         .procname       = "force_mld_version",
4314                         .data           = &ipv6_devconf.force_mld_version,
4315                         .maxlen         = sizeof(int),
4316                         .mode           = 0644,
4317                         .proc_handler   = proc_dointvec,
4318                 },
4319 #ifdef CONFIG_IPV6_PRIVACY
4320                 {
4321                         .procname       = "use_tempaddr",
4322                         .data           = &ipv6_devconf.use_tempaddr,
4323                         .maxlen         = sizeof(int),
4324                         .mode           = 0644,
4325                         .proc_handler   = proc_dointvec,
4326                 },
4327                 {
4328                         .procname       = "temp_valid_lft",
4329                         .data           = &ipv6_devconf.temp_valid_lft,
4330                         .maxlen         = sizeof(int),
4331                         .mode           = 0644,
4332                         .proc_handler   = proc_dointvec,
4333                 },
4334                 {
4335                         .procname       = "temp_prefered_lft",
4336                         .data           = &ipv6_devconf.temp_prefered_lft,
4337                         .maxlen         = sizeof(int),
4338                         .mode           = 0644,
4339                         .proc_handler   = proc_dointvec,
4340                 },
4341                 {
4342                         .procname       = "regen_max_retry",
4343                         .data           = &ipv6_devconf.regen_max_retry,
4344                         .maxlen         = sizeof(int),
4345                         .mode           = 0644,
4346                         .proc_handler   = proc_dointvec,
4347                 },
4348                 {
4349                         .procname       = "max_desync_factor",
4350                         .data           = &ipv6_devconf.max_desync_factor,
4351                         .maxlen         = sizeof(int),
4352                         .mode           = 0644,
4353                         .proc_handler   = proc_dointvec,
4354                 },
4355 #endif
4356                 {
4357                         .procname       = "max_addresses",
4358                         .data           = &ipv6_devconf.max_addresses,
4359                         .maxlen         = sizeof(int),
4360                         .mode           = 0644,
4361                         .proc_handler   = proc_dointvec,
4362                 },
4363                 {
4364                         .procname       = "accept_ra_defrtr",
4365                         .data           = &ipv6_devconf.accept_ra_defrtr,
4366                         .maxlen         = sizeof(int),
4367                         .mode           = 0644,
4368                         .proc_handler   = proc_dointvec,
4369                 },
4370                 {
4371                         .procname       = "accept_ra_pinfo",
4372                         .data           = &ipv6_devconf.accept_ra_pinfo,
4373                         .maxlen         = sizeof(int),
4374                         .mode           = 0644,
4375                         .proc_handler   = proc_dointvec,
4376                 },
4377 #ifdef CONFIG_IPV6_ROUTER_PREF
4378                 {
4379                         .procname       = "accept_ra_rtr_pref",
4380                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4381                         .maxlen         = sizeof(int),
4382                         .mode           = 0644,
4383                         .proc_handler   = proc_dointvec,
4384                 },
4385                 {
4386                         .procname       = "router_probe_interval",
4387                         .data           = &ipv6_devconf.rtr_probe_interval,
4388                         .maxlen         = sizeof(int),
4389                         .mode           = 0644,
4390                         .proc_handler   = proc_dointvec_jiffies,
4391                 },
4392 #ifdef CONFIG_IPV6_ROUTE_INFO
4393                 {
4394                         .procname       = "accept_ra_rt_info_max_plen",
4395                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4396                         .maxlen         = sizeof(int),
4397                         .mode           = 0644,
4398                         .proc_handler   = proc_dointvec,
4399                 },
4400 #endif
4401 #endif
4402                 {
4403                         .procname       = "proxy_ndp",
4404                         .data           = &ipv6_devconf.proxy_ndp,
4405                         .maxlen         = sizeof(int),
4406                         .mode           = 0644,
4407                         .proc_handler   = proc_dointvec,
4408                 },
4409                 {
4410                         .procname       = "accept_source_route",
4411                         .data           = &ipv6_devconf.accept_source_route,
4412                         .maxlen         = sizeof(int),
4413                         .mode           = 0644,
4414                         .proc_handler   = proc_dointvec,
4415                 },
4416 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4417                 {
4418                         .procname       = "optimistic_dad",
4419                         .data           = &ipv6_devconf.optimistic_dad,
4420                         .maxlen         = sizeof(int),
4421                         .mode           = 0644,
4422                         .proc_handler   = proc_dointvec,
4423
4424                 },
4425 #endif
4426 #ifdef CONFIG_IPV6_MROUTE
4427                 {
4428                         .procname       = "mc_forwarding",
4429                         .data           = &ipv6_devconf.mc_forwarding,
4430                         .maxlen         = sizeof(int),
4431                         .mode           = 0444,
4432                         .proc_handler   = proc_dointvec,
4433                 },
4434 #endif
4435                 {
4436                         .procname       = "disable_ipv6",
4437                         .data           = &ipv6_devconf.disable_ipv6,
4438                         .maxlen         = sizeof(int),
4439                         .mode           = 0644,
4440                         .proc_handler   = addrconf_sysctl_disable,
4441                 },
4442                 {
4443                         .procname       = "accept_dad",
4444                         .data           = &ipv6_devconf.accept_dad,
4445                         .maxlen         = sizeof(int),
4446                         .mode           = 0644,
4447                         .proc_handler   = proc_dointvec,
4448                 },
4449                 {
4450                         .procname       = "force_tllao",
4451                         .data           = &ipv6_devconf.force_tllao,
4452                         .maxlen         = sizeof(int),
4453                         .mode           = 0644,
4454                         .proc_handler   = proc_dointvec
4455                 },
4456                 {
4457                         /* sentinel */
4458                 }
4459         },
4460 };
4461
4462 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4463                 struct inet6_dev *idev, struct ipv6_devconf *p)
4464 {
4465         int i;
4466         struct addrconf_sysctl_table *t;
4467
4468 #define ADDRCONF_CTL_PATH_DEV   3
4469
4470         struct ctl_path addrconf_ctl_path[] = {
4471                 { .procname = "net", },
4472                 { .procname = "ipv6", },
4473                 { .procname = "conf", },
4474                 { /* to be set */ },
4475                 { },
4476         };
4477
4478
4479         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4480         if (t == NULL)
4481                 goto out;
4482
4483         for (i = 0; t->addrconf_vars[i].data; i++) {
4484                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4485                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4486                 t->addrconf_vars[i].extra2 = net;
4487         }
4488
4489         /*
4490          * Make a copy of dev_name, because '.procname' is regarded as const
4491          * by sysctl and we wouldn't want anyone to change it under our feet
4492          * (see SIOCSIFNAME).
4493          */
4494         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4495         if (!t->dev_name)
4496                 goto free;
4497
4498         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4499
4500         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4501                         t->addrconf_vars);
4502         if (t->sysctl_header == NULL)
4503                 goto free_procname;
4504
4505         p->sysctl = t;
4506         return 0;
4507
4508 free_procname:
4509         kfree(t->dev_name);
4510 free:
4511         kfree(t);
4512 out:
4513         return -ENOBUFS;
4514 }
4515
4516 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4517 {
4518         struct addrconf_sysctl_table *t;
4519
4520         if (p->sysctl == NULL)
4521                 return;
4522
4523         t = p->sysctl;
4524         p->sysctl = NULL;
4525         unregister_sysctl_table(t->sysctl_header);
4526         kfree(t->dev_name);
4527         kfree(t);
4528 }
4529
4530 static void addrconf_sysctl_register(struct inet6_dev *idev)
4531 {
4532         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4533                               &ndisc_ifinfo_sysctl_change);
4534         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4535                                         idev, &idev->cnf);
4536 }
4537
4538 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4539 {
4540         __addrconf_sysctl_unregister(&idev->cnf);
4541         neigh_sysctl_unregister(idev->nd_parms);
4542 }
4543
4544
4545 #endif
4546
4547 static int __net_init addrconf_init_net(struct net *net)
4548 {
4549         int err;
4550         struct ipv6_devconf *all, *dflt;
4551
4552         err = -ENOMEM;
4553         all = &ipv6_devconf;
4554         dflt = &ipv6_devconf_dflt;
4555
4556         if (!net_eq(net, &init_net)) {
4557                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4558                 if (all == NULL)
4559                         goto err_alloc_all;
4560
4561                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4562                 if (dflt == NULL)
4563                         goto err_alloc_dflt;
4564         } else {
4565                 /* these will be inherited by all namespaces */
4566                 dflt->autoconf = ipv6_defaults.autoconf;
4567                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4568         }
4569
4570         net->ipv6.devconf_all = all;
4571         net->ipv6.devconf_dflt = dflt;
4572
4573 #ifdef CONFIG_SYSCTL
4574         err = __addrconf_sysctl_register(net, "all", NULL, all);
4575         if (err < 0)
4576                 goto err_reg_all;
4577
4578         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4579         if (err < 0)
4580                 goto err_reg_dflt;
4581 #endif
4582         return 0;
4583
4584 #ifdef CONFIG_SYSCTL
4585 err_reg_dflt:
4586         __addrconf_sysctl_unregister(all);
4587 err_reg_all:
4588         kfree(dflt);
4589 #endif
4590 err_alloc_dflt:
4591         kfree(all);
4592 err_alloc_all:
4593         return err;
4594 }
4595
4596 static void __net_exit addrconf_exit_net(struct net *net)
4597 {
4598 #ifdef CONFIG_SYSCTL
4599         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4600         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4601 #endif
4602         if (!net_eq(net, &init_net)) {
4603                 kfree(net->ipv6.devconf_dflt);
4604                 kfree(net->ipv6.devconf_all);
4605         }
4606 }
4607
4608 static struct pernet_operations addrconf_ops = {
4609         .init = addrconf_init_net,
4610         .exit = addrconf_exit_net,
4611 };
4612
4613 /*
4614  *      Device notifier
4615  */
4616
4617 int register_inet6addr_notifier(struct notifier_block *nb)
4618 {
4619         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4620 }
4621 EXPORT_SYMBOL(register_inet6addr_notifier);
4622
4623 int unregister_inet6addr_notifier(struct notifier_block *nb)
4624 {
4625         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4626 }
4627 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4628
4629 /*
4630  *      Init / cleanup code
4631  */
4632
4633 int __init addrconf_init(void)
4634 {
4635         int i, err;
4636
4637         err = ipv6_addr_label_init();
4638         if (err < 0) {
4639                 printk(KERN_CRIT "IPv6 Addrconf:"
4640                        " cannot initialize default policy table: %d.\n", err);
4641                 goto out;
4642         }
4643
4644         err = register_pernet_subsys(&addrconf_ops);
4645         if (err < 0)
4646                 goto out_addrlabel;
4647
4648         /* The addrconf netdev notifier requires that loopback_dev
4649          * has it's ipv6 private information allocated and setup
4650          * before it can bring up and give link-local addresses
4651          * to other devices which are up.
4652          *
4653          * Unfortunately, loopback_dev is not necessarily the first
4654          * entry in the global dev_base list of net devices.  In fact,
4655          * it is likely to be the very last entry on that list.
4656          * So this causes the notifier registry below to try and
4657          * give link-local addresses to all devices besides loopback_dev
4658          * first, then loopback_dev, which cases all the non-loopback_dev
4659          * devices to fail to get a link-local address.
4660          *
4661          * So, as a temporary fix, allocate the ipv6 structure for
4662          * loopback_dev first by hand.
4663          * Longer term, all of the dependencies ipv6 has upon the loopback
4664          * device and it being up should be removed.
4665          */
4666         rtnl_lock();
4667         if (!ipv6_add_dev(init_net.loopback_dev))
4668                 err = -ENOMEM;
4669         rtnl_unlock();
4670         if (err)
4671                 goto errlo;
4672
4673         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4674                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4675
4676         register_netdevice_notifier(&ipv6_dev_notf);
4677
4678         addrconf_verify(0);
4679
4680         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4681         if (err < 0)
4682                 goto errout;
4683
4684         /* Only the first call to __rtnl_register can fail */
4685         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4686         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4687         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4688         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4689         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4690
4691         ipv6_addr_label_rtnl_register();
4692
4693         return 0;
4694 errout:
4695         unregister_netdevice_notifier(&ipv6_dev_notf);
4696 errlo:
4697         unregister_pernet_subsys(&addrconf_ops);
4698 out_addrlabel:
4699         ipv6_addr_label_cleanup();
4700 out:
4701         return err;
4702 }
4703
4704 void addrconf_cleanup(void)
4705 {
4706         struct net_device *dev;
4707         int i;
4708
4709         unregister_netdevice_notifier(&ipv6_dev_notf);
4710         unregister_pernet_subsys(&addrconf_ops);
4711         ipv6_addr_label_cleanup();
4712
4713         rtnl_lock();
4714
4715         /* clean dev list */
4716         for_each_netdev(&init_net, dev) {
4717                 if (__in6_dev_get(dev) == NULL)
4718                         continue;
4719                 addrconf_ifdown(dev, 1);
4720         }
4721         addrconf_ifdown(init_net.loopback_dev, 2);
4722
4723         /*
4724          *      Check hash table.
4725          */
4726         spin_lock_bh(&addrconf_hash_lock);
4727         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4728                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4729         spin_unlock_bh(&addrconf_hash_lock);
4730
4731         del_timer(&addr_chk_timer);
4732         rtnl_unlock();
4733 }