net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <[email protected]>
   7  *      Alexey Kuznetsov        <[email protected]>
   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  *      <[email protected]>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #include <linux/errno.h>
  42 #include <linux/types.h>
  43 #include <linux/kernel.h>
  44 #include <linux/socket.h>
  45 #include <linux/sockios.h>
  46 #include <linux/net.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <linux/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90
  91 /* Set to 3 to get tracing... */
  92 #define ACONF_DEBUG 2
  93
  94 #if ACONF_DEBUG >= 3
  95 #define ADBG(x) printk x
  96 #else
  97 #define ADBG(x)
  98 #endif
  99
 100 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 101
 102 static inline u32 cstamp_delta(unsigned long cstamp)
 103 {
 104         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 105 }
 106
 107 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
 108 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
 109 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
 110
 111 #ifdef CONFIG_SYSCTL
 112 static void addrconf_sysctl_register(struct inet6_dev *idev);
 113 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 114 #else
 115 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 116 {
 117 }
 118
 119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 120 {
 121 }
 122 #endif
 123
 124 #ifdef CONFIG_IPV6_PRIVACY
 125 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 127 static void ipv6_regen_rndid(unsigned long data);
 128 #endif
 129
 130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 131 static int ipv6_count_addresses(struct inet6_dev *idev);
 132
 133 /*
 134  *      Configured unicast address hash table
 135  */
 136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 137 static DEFINE_SPINLOCK(addrconf_hash_lock);
 138
 139 static void addrconf_verify(unsigned long);
 140
 141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 142 static DEFINE_SPINLOCK(addrconf_verify_lock);
 143
 144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 146
 147 static void addrconf_type_change(struct net_device *dev,
 148                                  unsigned long event);
 149 static int addrconf_ifdown(struct net_device *dev, int how);
 150
 151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 152 static void addrconf_dad_timer(unsigned long data);
 153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 154 static void addrconf_dad_run(struct inet6_dev *idev);
 155 static void addrconf_rs_timer(unsigned long data);
 156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 158
 159 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 160                                 struct prefix_info *pinfo);
 161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 162                                struct net_device *dev);
 163
 164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 165
 166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 167         .forwarding             = 0,
 168         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 169         .mtu6                   = IPV6_MIN_MTU,
 170         .accept_ra              = 1,
 171         .accept_redirects       = 1,
 172         .autoconf               = 1,
 173         .force_mld_version      = 0,
 174         .dad_transmits          = 1,
 175         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 176         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 177         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 178 #ifdef CONFIG_IPV6_PRIVACY
 179         .use_tempaddr           = 0,
 180         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 181         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 182         .regen_max_retry        = REGEN_MAX_RETRY,
 183         .max_desync_factor      = MAX_DESYNC_FACTOR,
 184 #endif
 185         .max_addresses          = IPV6_MAX_ADDRESSES,
 186         .accept_ra_defrtr       = 1,
 187         .accept_ra_pinfo        = 1,
 188 #ifdef CONFIG_IPV6_ROUTER_PREF
 189         .accept_ra_rtr_pref     = 1,
 190         .rtr_probe_interval     = 60 * HZ,
 191 #ifdef CONFIG_IPV6_ROUTE_INFO
 192         .accept_ra_rt_info_max_plen = 0,
 193 #endif
 194 #endif
 195         .proxy_ndp              = 0,
 196         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 197         .disable_ipv6           = 0,
 198         .accept_dad             = 1,
 199 };
 200
 201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 202         .forwarding             = 0,
 203         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 204         .mtu6                   = IPV6_MIN_MTU,
 205         .accept_ra              = 1,
 206         .accept_redirects       = 1,
 207         .autoconf               = 1,
 208         .dad_transmits          = 1,
 209         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 210         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 211         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 212 #ifdef CONFIG_IPV6_PRIVACY
 213         .use_tempaddr           = 0,
 214         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 215         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 216         .regen_max_retry        = REGEN_MAX_RETRY,
 217         .max_desync_factor      = MAX_DESYNC_FACTOR,
 218 #endif
 219         .max_addresses          = IPV6_MAX_ADDRESSES,
 220         .accept_ra_defrtr       = 1,
 221         .accept_ra_pinfo        = 1,
 222 #ifdef CONFIG_IPV6_ROUTER_PREF
 223         .accept_ra_rtr_pref     = 1,
 224         .rtr_probe_interval     = 60 * HZ,
 225 #ifdef CONFIG_IPV6_ROUTE_INFO
 226         .accept_ra_rt_info_max_plen = 0,
 227 #endif
 228 #endif
 229         .proxy_ndp              = 0,
 230         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 231         .disable_ipv6           = 0,
 232         .accept_dad             = 1,
 233 };
 234
 235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 240
 241 /* Check if a valid qdisc is available */
 242 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 243 {
 244         return !qdisc_tx_is_noop(dev);
 245 }
 246
 247 /* Check if a route is valid prefix route */
 248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 249 {
 250         return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
 251 }
 252
 253 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 254 {
 255         if (del_timer(&ifp->timer))
 256                 __in6_ifa_put(ifp);
 257 }
 258
 259 enum addrconf_timer_t {
 260         AC_NONE,
 261         AC_DAD,
 262         AC_RS,
 263 };
 264
 265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 266                                enum addrconf_timer_t what,
 267                                unsigned long when)
 268 {
 269         if (!del_timer(&ifp->timer))
 270                 in6_ifa_hold(ifp);
 271
 272         switch (what) {
 273         case AC_DAD:
 274                 ifp->timer.function = addrconf_dad_timer;
 275                 break;
 276         case AC_RS:
 277                 ifp->timer.function = addrconf_rs_timer;
 278                 break;
 279         default:
 280                 break;
 281         }
 282         ifp->timer.expires = jiffies + when;
 283         add_timer(&ifp->timer);
 284 }
 285
 286 static int snmp6_alloc_dev(struct inet6_dev *idev)
 287 {
 288         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 289                           sizeof(struct ipstats_mib),
 290                           __alignof__(struct ipstats_mib)) < 0)
 291                 goto err_ip;
 292         if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
 293                           sizeof(struct icmpv6_mib),
 294                           __alignof__(struct icmpv6_mib)) < 0)
 295                 goto err_icmp;
 296         if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
 297                           sizeof(struct icmpv6msg_mib),
 298                           __alignof__(struct icmpv6msg_mib)) < 0)
 299                 goto err_icmpmsg;
 300
 301         return 0;
 302
 303 err_icmpmsg:
 304         snmp_mib_free((void __percpu **)idev->stats.icmpv6);
 305 err_icmp:
 306         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 307 err_ip:
 308         return -ENOMEM;
 309 }
 310
 311 static void snmp6_free_dev(struct inet6_dev *idev)
 312 {
 313         snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
 314         snmp_mib_free((void __percpu **)idev->stats.icmpv6);
 315         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 316 }
 317
 318 /* Nobody refers to this device, we may destroy it. */
 319
 320 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 321 {
 322         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 323         kfree(idev);
 324 }
 325
 326 void in6_dev_finish_destroy(struct inet6_dev *idev)
 327 {
 328         struct net_device *dev = idev->dev;
 329
 330         WARN_ON(!list_empty(&idev->addr_list));
 331         WARN_ON(idev->mc_list != NULL);
 332
 333 #ifdef NET_REFCNT_DEBUG
 334         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 335 #endif
 336         dev_put(dev);
 337         if (!idev->dead) {
 338                 pr_warning("Freeing alive inet6 device %p\n", idev);
 339                 return;
 340         }
 341         snmp6_free_dev(idev);
 342         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 343 }
 344
 345 EXPORT_SYMBOL(in6_dev_finish_destroy);
 346
 347 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 348 {
 349         struct inet6_dev *ndev;
 350
 351         ASSERT_RTNL();
 352
 353         if (dev->mtu < IPV6_MIN_MTU)
 354                 return NULL;
 355
 356         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 357
 358         if (ndev == NULL)
 359                 return NULL;
 360
 361         rwlock_init(&ndev->lock);
 362         ndev->dev = dev;
 363         INIT_LIST_HEAD(&ndev->addr_list);
 364
 365         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 366         ndev->cnf.mtu6 = dev->mtu;
 367         ndev->cnf.sysctl = NULL;
 368         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 369         if (ndev->nd_parms == NULL) {
 370                 kfree(ndev);
 371                 return NULL;
 372         }
 373         if (ndev->cnf.forwarding)
 374                 dev_disable_lro(dev);
 375         /* We refer to the device */
 376         dev_hold(dev);
 377
 378         if (snmp6_alloc_dev(ndev) < 0) {
 379                 ADBG((KERN_WARNING
 380                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 381                         __func__, dev->name));
 382                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 383                 ndev->dead = 1;
 384                 in6_dev_finish_destroy(ndev);
 385                 return NULL;
 386         }
 387
 388         if (snmp6_register_dev(ndev) < 0) {
 389                 ADBG((KERN_WARNING
 390                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 391                         __func__, dev->name));
 392                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 393                 ndev->dead = 1;
 394                 in6_dev_finish_destroy(ndev);
 395                 return NULL;
 396         }
 397
 398         /* One reference from device.  We must do this before
 399          * we invoke __ipv6_regen_rndid().
 400          */
 401         in6_dev_hold(ndev);
 402
 403         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 404                 ndev->cnf.accept_dad = -1;
 405
 406 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 407         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 408                 printk(KERN_INFO
 409                        "%s: Disabled Multicast RS\n",
 410                        dev->name);
 411                 ndev->cnf.rtr_solicits = 0;
 412         }
 413 #endif
 414
 415 #ifdef CONFIG_IPV6_PRIVACY
 416         INIT_LIST_HEAD(&ndev->tempaddr_list);
 417         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 418         if ((dev->flags&IFF_LOOPBACK) ||
 419             dev->type == ARPHRD_TUNNEL ||
 420             dev->type == ARPHRD_TUNNEL6 ||
 421             dev->type == ARPHRD_SIT ||
 422             dev->type == ARPHRD_NONE) {
 423                 printk(KERN_INFO
 424                        "%s: Disabled Privacy Extensions\n",
 425                        dev->name);
 426                 ndev->cnf.use_tempaddr = -1;
 427         } else {
 428                 in6_dev_hold(ndev);
 429                 ipv6_regen_rndid((unsigned long) ndev);
 430         }
 431 #endif
 432
 433         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 434                 ndev->if_flags |= IF_READY;
 435
 436         ipv6_mc_init_dev(ndev);
 437         ndev->tstamp = jiffies;
 438         addrconf_sysctl_register(ndev);
 439         /* protected by rtnl_lock */
 440         rcu_assign_pointer(dev->ip6_ptr, ndev);
 441
 442         /* Join all-node multicast group */
 443         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 444
 445         return ndev;
 446 }
 447
 448 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 449 {
 450         struct inet6_dev *idev;
 451
 452         ASSERT_RTNL();
 453
 454         idev = __in6_dev_get(dev);
 455         if (!idev) {
 456                 idev = ipv6_add_dev(dev);
 457                 if (!idev)
 458                         return NULL;
 459         }
 460
 461         if (dev->flags&IFF_UP)
 462                 ipv6_mc_up(idev);
 463         return idev;
 464 }
 465
 466 #ifdef CONFIG_SYSCTL
 467 static void dev_forward_change(struct inet6_dev *idev)
 468 {
 469         struct net_device *dev;
 470         struct inet6_ifaddr *ifa;
 471
 472         if (!idev)
 473                 return;
 474         dev = idev->dev;
 475         if (idev->cnf.forwarding)
 476                 dev_disable_lro(dev);
 477         if (dev && (dev->flags & IFF_MULTICAST)) {
 478                 if (idev->cnf.forwarding)
 479                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 480                 else
 481                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 482         }
 483
 484         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 485                 if (ifa->flags&IFA_F_TENTATIVE)
 486                         continue;
 487                 if (idev->cnf.forwarding)
 488                         addrconf_join_anycast(ifa);
 489                 else
 490                         addrconf_leave_anycast(ifa);
 491         }
 492 }
 493
 494
 495 static void addrconf_forward_change(struct net *net, __s32 newf)
 496 {
 497         struct net_device *dev;
 498         struct inet6_dev *idev;
 499
 500         rcu_read_lock();
 501         for_each_netdev_rcu(net, dev) {
 502                 idev = __in6_dev_get(dev);
 503                 if (idev) {
 504                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 505                         idev->cnf.forwarding = newf;
 506                         if (changed)
 507                                 dev_forward_change(idev);
 508                 }
 509         }
 510         rcu_read_unlock();
 511 }
 512
 513 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 514 {
 515         struct net *net;
 516
 517         net = (struct net *)table->extra2;
 518         if (p == &net->ipv6.devconf_dflt->forwarding)
 519                 return 0;
 520
 521         if (!rtnl_trylock()) {
 522                 /* Restore the original values before restarting */
 523                 *p = old;
 524                 return restart_syscall();
 525         }
 526
 527         if (p == &net->ipv6.devconf_all->forwarding) {
 528                 __s32 newf = net->ipv6.devconf_all->forwarding;
 529                 net->ipv6.devconf_dflt->forwarding = newf;
 530                 addrconf_forward_change(net, newf);
 531         } else if ((!*p) ^ (!old))
 532                 dev_forward_change((struct inet6_dev *)table->extra1);
 533         rtnl_unlock();
 534
 535         if (*p)
 536                 rt6_purge_dflt_routers(net);
 537         return 1;
 538 }
 539 #endif
 540
 541 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
 542 {
 543         struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
 544         kfree(ifp);
 545 }
 546
 547 /* Nobody refers to this ifaddr, destroy it */
 548 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 549 {
 550         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 551
 552 #ifdef NET_REFCNT_DEBUG
 553         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 554 #endif
 555
 556         in6_dev_put(ifp->idev);
 557
 558         if (del_timer(&ifp->timer))
 559                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 560
 561         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 562                 pr_warning("Freeing alive inet6 address %p\n", ifp);
 563                 return;
 564         }
 565         dst_release(&ifp->rt->dst);
 566
 567         call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
 568 }
 569
 570 static void
 571 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 572 {
 573         struct list_head *p;
 574         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 575
 576         /*
 577          * Each device address list is sorted in order of scope -
 578          * global before linklocal.
 579          */
 580         list_for_each(p, &idev->addr_list) {
 581                 struct inet6_ifaddr *ifa
 582                         = list_entry(p, struct inet6_ifaddr, if_list);
 583                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 584                         break;
 585         }
 586
 587         list_add_tail(&ifp->if_list, p);
 588 }
 589
 590 static u32 ipv6_addr_hash(const struct in6_addr *addr)
 591 {
 592         /*
 593          * We perform the hash function over the last 64 bits of the address
 594          * This will include the IEEE address token on links that support it.
 595          */
 596         return jhash_2words((__force u32)addr->s6_addr32[2],
 597                             (__force u32)addr->s6_addr32[3], 0)
 598                 & (IN6_ADDR_HSIZE - 1);
 599 }
 600
 601 /* On success it returns ifp with increased reference count */
 602
 603 static struct inet6_ifaddr *
 604 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 605               int scope, u32 flags)
 606 {
 607         struct inet6_ifaddr *ifa = NULL;
 608         struct rt6_info *rt;
 609         unsigned int hash;
 610         int err = 0;
 611         int addr_type = ipv6_addr_type(addr);
 612
 613         if (addr_type == IPV6_ADDR_ANY ||
 614             addr_type & IPV6_ADDR_MULTICAST ||
 615             (!(idev->dev->flags & IFF_LOOPBACK) &&
 616              addr_type & IPV6_ADDR_LOOPBACK))
 617                 return ERR_PTR(-EADDRNOTAVAIL);
 618
 619         rcu_read_lock_bh();
 620         if (idev->dead) {
 621                 err = -ENODEV;                  /*XXX*/
 622                 goto out2;
 623         }
 624
 625         if (idev->cnf.disable_ipv6) {
 626                 err = -EACCES;
 627                 goto out2;
 628         }
 629
 630         spin_lock(&addrconf_hash_lock);
 631
 632         /* Ignore adding duplicate addresses on an interface */
 633         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 634                 ADBG(("ipv6_add_addr: already assigned\n"));
 635                 err = -EEXIST;
 636                 goto out;
 637         }
 638
 639         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 640
 641         if (ifa == NULL) {
 642                 ADBG(("ipv6_add_addr: malloc failed\n"));
 643                 err = -ENOBUFS;
 644                 goto out;
 645         }
 646
 647         rt = addrconf_dst_alloc(idev, addr, 0);
 648         if (IS_ERR(rt)) {
 649                 err = PTR_ERR(rt);
 650                 goto out;
 651         }
 652
 653         ipv6_addr_copy(&ifa->addr, addr);
 654
 655         spin_lock_init(&ifa->lock);
 656         spin_lock_init(&ifa->state_lock);
 657         init_timer(&ifa->timer);
 658         INIT_HLIST_NODE(&ifa->addr_lst);
 659         ifa->timer.data = (unsigned long) ifa;
 660         ifa->scope = scope;
 661         ifa->prefix_len = pfxlen;
 662         ifa->flags = flags | IFA_F_TENTATIVE;
 663         ifa->cstamp = ifa->tstamp = jiffies;
 664
 665         ifa->rt = rt;
 666
 667         /*
 668          * part one of RFC 4429, section 3.3
 669          * We should not configure an address as
 670          * optimistic if we do not yet know the link
 671          * layer address of our nexhop router
 672          */
 673
 674         if (rt->rt6i_nexthop == NULL)
 675                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 676
 677         ifa->idev = idev;
 678         in6_dev_hold(idev);
 679         /* For caller */
 680         in6_ifa_hold(ifa);
 681
 682         /* Add to big hash table */
 683         hash = ipv6_addr_hash(addr);
 684
 685         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 686         spin_unlock(&addrconf_hash_lock);
 687
 688         write_lock(&idev->lock);
 689         /* Add to inet6_dev unicast addr list. */
 690         ipv6_link_dev_addr(idev, ifa);
 691
 692 #ifdef CONFIG_IPV6_PRIVACY
 693         if (ifa->flags&IFA_F_TEMPORARY) {
 694                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 695                 in6_ifa_hold(ifa);
 696         }
 697 #endif
 698
 699         in6_ifa_hold(ifa);
 700         write_unlock(&idev->lock);
 701 out2:
 702         rcu_read_unlock_bh();
 703
 704         if (likely(err == 0))
 705                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 706         else {
 707                 kfree(ifa);
 708                 ifa = ERR_PTR(err);
 709         }
 710
 711         return ifa;
 712 out:
 713         spin_unlock(&addrconf_hash_lock);
 714         goto out2;
 715 }
 716
 717 /* This function wants to get referenced ifp and releases it before return */
 718
 719 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 720 {
 721         struct inet6_ifaddr *ifa, *ifn;
 722         struct inet6_dev *idev = ifp->idev;
 723         int state;
 724         int hash;
 725         int deleted = 0, onlink = 0;
 726         unsigned long expires = jiffies;
 727
 728         hash = ipv6_addr_hash(&ifp->addr);
 729
 730         spin_lock_bh(&ifp->state_lock);
 731         state = ifp->state;
 732         ifp->state = INET6_IFADDR_STATE_DEAD;
 733         spin_unlock_bh(&ifp->state_lock);
 734
 735         if (state == INET6_IFADDR_STATE_DEAD)
 736                 goto out;
 737
 738         spin_lock_bh(&addrconf_hash_lock);
 739         hlist_del_init_rcu(&ifp->addr_lst);
 740         spin_unlock_bh(&addrconf_hash_lock);
 741
 742         write_lock_bh(&idev->lock);
 743 #ifdef CONFIG_IPV6_PRIVACY
 744         if (ifp->flags&IFA_F_TEMPORARY) {
 745                 list_del(&ifp->tmp_list);
 746                 if (ifp->ifpub) {
 747                         in6_ifa_put(ifp->ifpub);
 748                         ifp->ifpub = NULL;
 749                 }
 750                 __in6_ifa_put(ifp);
 751         }
 752 #endif
 753
 754         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 755                 if (ifa == ifp) {
 756                         list_del_init(&ifp->if_list);
 757                         __in6_ifa_put(ifp);
 758
 759                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 760                                 break;
 761                         deleted = 1;
 762                         continue;
 763                 } else if (ifp->flags & IFA_F_PERMANENT) {
 764                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 765                                               ifp->prefix_len)) {
 766                                 if (ifa->flags & IFA_F_PERMANENT) {
 767                                         onlink = 1;
 768                                         if (deleted)
 769                                                 break;
 770                                 } else {
 771                                         unsigned long lifetime;
 772
 773                                         if (!onlink)
 774                                                 onlink = -1;
 775
 776                                         spin_lock(&ifa->lock);
 777
 778                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 779                                         /*
 780                                          * Note: Because this address is
 781                                          * not permanent, lifetime <
 782                                          * LONG_MAX / HZ here.
 783                                          */
 784                                         if (time_before(expires,
 785                                                         ifa->tstamp + lifetime * HZ))
 786                                                 expires = ifa->tstamp + lifetime * HZ;
 787                                         spin_unlock(&ifa->lock);
 788                                 }
 789                         }
 790                 }
 791         }
 792         write_unlock_bh(&idev->lock);
 793
 794         addrconf_del_timer(ifp);
 795
 796         ipv6_ifa_notify(RTM_DELADDR, ifp);
 797
 798         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 799
 800         /*
 801          * Purge or update corresponding prefix
 802          *
 803          * 1) we don't purge prefix here if address was not permanent.
 804          *    prefix is managed by its own lifetime.
 805          * 2) if there're no addresses, delete prefix.
 806          * 3) if there're still other permanent address(es),
 807          *    corresponding prefix is still permanent.
 808          * 4) otherwise, update prefix lifetime to the
 809          *    longest valid lifetime among the corresponding
 810          *    addresses on the device.
 811          *    Note: subsequent RA will update lifetime.
 812          *
 813          * --yoshfuji
 814          */
 815         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 816                 struct in6_addr prefix;
 817                 struct rt6_info *rt;
 818                 struct net *net = dev_net(ifp->idev->dev);
 819                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 820                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 821
 822                 if (rt && addrconf_is_prefix_route(rt)) {
 823                         if (onlink == 0) {
 824                                 ip6_del_rt(rt);
 825                                 rt = NULL;
 826                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 827                                 rt->rt6i_expires = expires;
 828                                 rt->rt6i_flags |= RTF_EXPIRES;
 829                         }
 830                 }
 831                 dst_release(&rt->dst);
 832         }
 833
 834 out:
 835         in6_ifa_put(ifp);
 836 }
 837
 838 #ifdef CONFIG_IPV6_PRIVACY
 839 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 840 {
 841         struct inet6_dev *idev = ifp->idev;
 842         struct in6_addr addr, *tmpaddr;
 843         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
 844         unsigned long regen_advance;
 845         int tmp_plen;
 846         int ret = 0;
 847         int max_addresses;
 848         u32 addr_flags;
 849
 850         write_lock(&idev->lock);
 851         if (ift) {
 852                 spin_lock_bh(&ift->lock);
 853                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 854                 spin_unlock_bh(&ift->lock);
 855                 tmpaddr = &addr;
 856         } else {
 857                 tmpaddr = NULL;
 858         }
 859 retry:
 860         in6_dev_hold(idev);
 861         if (idev->cnf.use_tempaddr <= 0) {
 862                 write_unlock(&idev->lock);
 863                 printk(KERN_INFO
 864                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 865                 in6_dev_put(idev);
 866                 ret = -1;
 867                 goto out;
 868         }
 869         spin_lock_bh(&ifp->lock);
 870         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 871                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 872                 spin_unlock_bh(&ifp->lock);
 873                 write_unlock(&idev->lock);
 874                 printk(KERN_WARNING
 875                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 876                 in6_dev_put(idev);
 877                 ret = -1;
 878                 goto out;
 879         }
 880         in6_ifa_hold(ifp);
 881         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 882         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 883                 spin_unlock_bh(&ifp->lock);
 884                 write_unlock(&idev->lock);
 885                 printk(KERN_WARNING
 886                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 887                 in6_ifa_put(ifp);
 888                 in6_dev_put(idev);
 889                 ret = -1;
 890                 goto out;
 891         }
 892         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 893         age = (jiffies - ifp->tstamp) / HZ;
 894         tmp_valid_lft = min_t(__u32,
 895                               ifp->valid_lft,
 896                               idev->cnf.temp_valid_lft + age);
 897         tmp_prefered_lft = min_t(__u32,
 898                                  ifp->prefered_lft,
 899                                  idev->cnf.temp_prefered_lft + age -
 900                                  idev->cnf.max_desync_factor);
 901         tmp_plen = ifp->prefix_len;
 902         max_addresses = idev->cnf.max_addresses;
 903         tmp_cstamp = ifp->cstamp;
 904         tmp_tstamp = ifp->tstamp;
 905         spin_unlock_bh(&ifp->lock);
 906
 907         regen_advance = idev->cnf.regen_max_retry *
 908                         idev->cnf.dad_transmits *
 909                         idev->nd_parms->retrans_time / HZ;
 910         write_unlock(&idev->lock);
 911
 912         /* A temporary address is created only if this calculated Preferred
 913          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 914          * an implementation must not create a temporary address with a zero
 915          * Preferred Lifetime.
 916          */
 917         if (tmp_prefered_lft <= regen_advance) {
 918                 in6_ifa_put(ifp);
 919                 in6_dev_put(idev);
 920                 ret = -1;
 921                 goto out;
 922         }
 923
 924         addr_flags = IFA_F_TEMPORARY;
 925         /* set in addrconf_prefix_rcv() */
 926         if (ifp->flags & IFA_F_OPTIMISTIC)
 927                 addr_flags |= IFA_F_OPTIMISTIC;
 928
 929         ift = !max_addresses ||
 930               ipv6_count_addresses(idev) < max_addresses ?
 931                 ipv6_add_addr(idev, &addr, tmp_plen,
 932                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 933                               addr_flags) : NULL;
 934         if (!ift || IS_ERR(ift)) {
 935                 in6_ifa_put(ifp);
 936                 in6_dev_put(idev);
 937                 printk(KERN_INFO
 938                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 939                 tmpaddr = &addr;
 940                 write_lock(&idev->lock);
 941                 goto retry;
 942         }
 943
 944         spin_lock_bh(&ift->lock);
 945         ift->ifpub = ifp;
 946         ift->valid_lft = tmp_valid_lft;
 947         ift->prefered_lft = tmp_prefered_lft;
 948         ift->cstamp = tmp_cstamp;
 949         ift->tstamp = tmp_tstamp;
 950         spin_unlock_bh(&ift->lock);
 951
 952         addrconf_dad_start(ift, 0);
 953         in6_ifa_put(ift);
 954         in6_dev_put(idev);
 955 out:
 956         return ret;
 957 }
 958 #endif
 959
 960 /*
 961  *      Choose an appropriate source address (RFC3484)
 962  */
 963 enum {
 964         IPV6_SADDR_RULE_INIT = 0,
 965         IPV6_SADDR_RULE_LOCAL,
 966         IPV6_SADDR_RULE_SCOPE,
 967         IPV6_SADDR_RULE_PREFERRED,
 968 #ifdef CONFIG_IPV6_MIP6
 969         IPV6_SADDR_RULE_HOA,
 970 #endif
 971         IPV6_SADDR_RULE_OIF,
 972         IPV6_SADDR_RULE_LABEL,
 973 #ifdef CONFIG_IPV6_PRIVACY
 974         IPV6_SADDR_RULE_PRIVACY,
 975 #endif
 976         IPV6_SADDR_RULE_ORCHID,
 977         IPV6_SADDR_RULE_PREFIX,
 978         IPV6_SADDR_RULE_MAX
 979 };
 980
 981 struct ipv6_saddr_score {
 982         int                     rule;
 983         int                     addr_type;
 984         struct inet6_ifaddr     *ifa;
 985         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 986         int                     scopedist;
 987         int                     matchlen;
 988 };
 989
 990 struct ipv6_saddr_dst {
 991         const struct in6_addr *addr;
 992         int ifindex;
 993         int scope;
 994         int label;
 995         unsigned int prefs;
 996 };
 997
 998 static inline int ipv6_saddr_preferred(int type)
 999 {
1000         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1001                 return 1;
1002         return 0;
1003 }
1004
1005 static int ipv6_get_saddr_eval(struct net *net,
1006                                struct ipv6_saddr_score *score,
1007                                struct ipv6_saddr_dst *dst,
1008                                int i)
1009 {
1010         int ret;
1011
1012         if (i <= score->rule) {
1013                 switch (i) {
1014                 case IPV6_SADDR_RULE_SCOPE:
1015                         ret = score->scopedist;
1016                         break;
1017                 case IPV6_SADDR_RULE_PREFIX:
1018                         ret = score->matchlen;
1019                         break;
1020                 default:
1021                         ret = !!test_bit(i, score->scorebits);
1022                 }
1023                 goto out;
1024         }
1025
1026         switch (i) {
1027         case IPV6_SADDR_RULE_INIT:
1028                 /* Rule 0: remember if hiscore is not ready yet */
1029                 ret = !!score->ifa;
1030                 break;
1031         case IPV6_SADDR_RULE_LOCAL:
1032                 /* Rule 1: Prefer same address */
1033                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1034                 break;
1035         case IPV6_SADDR_RULE_SCOPE:
1036                 /* Rule 2: Prefer appropriate scope
1037                  *
1038                  *      ret
1039                  *       ^
1040                  *    -1 |  d 15
1041                  *    ---+--+-+---> scope
1042                  *       |
1043                  *       |             d is scope of the destination.
1044                  *  B-d  |  \
1045                  *       |   \      <- smaller scope is better if
1046                  *  B-15 |    \        if scope is enough for destinaion.
1047                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1048                  * d-C-1 | /
1049                  *       |/         <- greater is better
1050                  *   -C  /             if scope is not enough for destination.
1051                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1052                  *
1053                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1054                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1055                  * Assume B = 0 and we get C > 29.
1056                  */
1057                 ret = __ipv6_addr_src_scope(score->addr_type);
1058                 if (ret >= dst->scope)
1059                         ret = -ret;
1060                 else
1061                         ret -= 128;     /* 30 is enough */
1062                 score->scopedist = ret;
1063                 break;
1064         case IPV6_SADDR_RULE_PREFERRED:
1065                 /* Rule 3: Avoid deprecated and optimistic addresses */
1066                 ret = ipv6_saddr_preferred(score->addr_type) ||
1067                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1068                 break;
1069 #ifdef CONFIG_IPV6_MIP6
1070         case IPV6_SADDR_RULE_HOA:
1071             {
1072                 /* Rule 4: Prefer home address */
1073                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1074                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1075                 break;
1076             }
1077 #endif
1078         case IPV6_SADDR_RULE_OIF:
1079                 /* Rule 5: Prefer outgoing interface */
1080                 ret = (!dst->ifindex ||
1081                        dst->ifindex == score->ifa->idev->dev->ifindex);
1082                 break;
1083         case IPV6_SADDR_RULE_LABEL:
1084                 /* Rule 6: Prefer matching label */
1085                 ret = ipv6_addr_label(net,
1086                                       &score->ifa->addr, score->addr_type,
1087                                       score->ifa->idev->dev->ifindex) == dst->label;
1088                 break;
1089 #ifdef CONFIG_IPV6_PRIVACY
1090         case IPV6_SADDR_RULE_PRIVACY:
1091             {
1092                 /* Rule 7: Prefer public address
1093                  * Note: prefer temprary address if use_tempaddr >= 2
1094                  */
1095                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1096                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1097                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1098                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1099                 break;
1100             }
1101 #endif
1102         case IPV6_SADDR_RULE_ORCHID:
1103                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1104                  *          non-ORCHID vs non-ORCHID
1105                  */
1106                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1107                         ipv6_addr_orchid(dst->addr));
1108                 break;
1109         case IPV6_SADDR_RULE_PREFIX:
1110                 /* Rule 8: Use longest matching prefix */
1111                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1112                                                        dst->addr);
1113                 break;
1114         default:
1115                 ret = 0;
1116         }
1117
1118         if (ret)
1119                 __set_bit(i, score->scorebits);
1120         score->rule = i;
1121 out:
1122         return ret;
1123 }
1124
1125 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1126                        const struct in6_addr *daddr, unsigned int prefs,
1127                        struct in6_addr *saddr)
1128 {
1129         struct ipv6_saddr_score scores[2],
1130                                 *score = &scores[0], *hiscore = &scores[1];
1131         struct ipv6_saddr_dst dst;
1132         struct net_device *dev;
1133         int dst_type;
1134
1135         dst_type = __ipv6_addr_type(daddr);
1136         dst.addr = daddr;
1137         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1138         dst.scope = __ipv6_addr_src_scope(dst_type);
1139         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1140         dst.prefs = prefs;
1141
1142         hiscore->rule = -1;
1143         hiscore->ifa = NULL;
1144
1145         rcu_read_lock();
1146
1147         for_each_netdev_rcu(net, dev) {
1148                 struct inet6_dev *idev;
1149
1150                 /* Candidate Source Address (section 4)
1151                  *  - multicast and link-local destination address,
1152                  *    the set of candidate source address MUST only
1153                  *    include addresses assigned to interfaces
1154                  *    belonging to the same link as the outgoing
1155                  *    interface.
1156                  * (- For site-local destination addresses, the
1157                  *    set of candidate source addresses MUST only
1158                  *    include addresses assigned to interfaces
1159                  *    belonging to the same site as the outgoing
1160                  *    interface.)
1161                  */
1162                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1163                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1164                     dst.ifindex && dev->ifindex != dst.ifindex)
1165                         continue;
1166
1167                 idev = __in6_dev_get(dev);
1168                 if (!idev)
1169                         continue;
1170
1171                 read_lock_bh(&idev->lock);
1172                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1173                         int i;
1174
1175                         /*
1176                          * - Tentative Address (RFC2462 section 5.4)
1177                          *  - A tentative address is not considered
1178                          *    "assigned to an interface" in the traditional
1179                          *    sense, unless it is also flagged as optimistic.
1180                          * - Candidate Source Address (section 4)
1181                          *  - In any case, anycast addresses, multicast
1182                          *    addresses, and the unspecified address MUST
1183                          *    NOT be included in a candidate set.
1184                          */
1185                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1186                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1187                                 continue;
1188
1189                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1190
1191                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1192                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1193                                 LIMIT_NETDEBUG(KERN_DEBUG
1194                                                "ADDRCONF: unspecified / multicast address "
1195                                                "assigned as unicast address on %s",
1196                                                dev->name);
1197                                 continue;
1198                         }
1199
1200                         score->rule = -1;
1201                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1202
1203                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1204                                 int minihiscore, miniscore;
1205
1206                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1207                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1208
1209                                 if (minihiscore > miniscore) {
1210                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1211                                             score->scopedist > 0) {
1212                                                 /*
1213                                                  * special case:
1214                                                  * each remaining entry
1215                                                  * has too small (not enough)
1216                                                  * scope, because ifa entries
1217                                                  * are sorted by their scope
1218                                                  * values.
1219                                                  */
1220                                                 goto try_nextdev;
1221                                         }
1222                                         break;
1223                                 } else if (minihiscore < miniscore) {
1224                                         if (hiscore->ifa)
1225                                                 in6_ifa_put(hiscore->ifa);
1226
1227                                         in6_ifa_hold(score->ifa);
1228
1229                                         swap(hiscore, score);
1230
1231                                         /* restore our iterator */
1232                                         score->ifa = hiscore->ifa;
1233
1234                                         break;
1235                                 }
1236                         }
1237                 }
1238 try_nextdev:
1239                 read_unlock_bh(&idev->lock);
1240         }
1241         rcu_read_unlock();
1242
1243         if (!hiscore->ifa)
1244                 return -EADDRNOTAVAIL;
1245
1246         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1247         in6_ifa_put(hiscore->ifa);
1248         return 0;
1249 }
1250 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1251
1252 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1253                     unsigned char banned_flags)
1254 {
1255         struct inet6_dev *idev;
1256         int err = -EADDRNOTAVAIL;
1257
1258         rcu_read_lock();
1259         idev = __in6_dev_get(dev);
1260         if (idev) {
1261                 struct inet6_ifaddr *ifp;
1262
1263                 read_lock_bh(&idev->lock);
1264                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1265                         if (ifp->scope == IFA_LINK &&
1266                             !(ifp->flags & banned_flags)) {
1267                                 ipv6_addr_copy(addr, &ifp->addr);
1268                                 err = 0;
1269                                 break;
1270                         }
1271                 }
1272                 read_unlock_bh(&idev->lock);
1273         }
1274         rcu_read_unlock();
1275         return err;
1276 }
1277
1278 static int ipv6_count_addresses(struct inet6_dev *idev)
1279 {
1280         int cnt = 0;
1281         struct inet6_ifaddr *ifp;
1282
1283         read_lock_bh(&idev->lock);
1284         list_for_each_entry(ifp, &idev->addr_list, if_list)
1285                 cnt++;
1286         read_unlock_bh(&idev->lock);
1287         return cnt;
1288 }
1289
1290 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1291                   struct net_device *dev, int strict)
1292 {
1293         struct inet6_ifaddr *ifp;
1294         struct hlist_node *node;
1295         unsigned int hash = ipv6_addr_hash(addr);
1296
1297         rcu_read_lock_bh();
1298         hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1299                 if (!net_eq(dev_net(ifp->idev->dev), net))
1300                         continue;
1301                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1302                     !(ifp->flags&IFA_F_TENTATIVE) &&
1303                     (dev == NULL || ifp->idev->dev == dev ||
1304                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1305                         rcu_read_unlock_bh();
1306                         return 1;
1307                 }
1308         }
1309
1310         rcu_read_unlock_bh();
1311         return 0;
1312 }
1313 EXPORT_SYMBOL(ipv6_chk_addr);
1314
1315 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1316                                struct net_device *dev)
1317 {
1318         unsigned int hash = ipv6_addr_hash(addr);
1319         struct inet6_ifaddr *ifp;
1320         struct hlist_node *node;
1321
1322         hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1323                 if (!net_eq(dev_net(ifp->idev->dev), net))
1324                         continue;
1325                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1326                         if (dev == NULL || ifp->idev->dev == dev)
1327                                 return true;
1328                 }
1329         }
1330         return false;
1331 }
1332
1333 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1334 {
1335         struct inet6_dev *idev;
1336         struct inet6_ifaddr *ifa;
1337         int     onlink;
1338
1339         onlink = 0;
1340         rcu_read_lock();
1341         idev = __in6_dev_get(dev);
1342         if (idev) {
1343                 read_lock_bh(&idev->lock);
1344                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1345                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1346                                                    ifa->prefix_len);
1347                         if (onlink)
1348                                 break;
1349                 }
1350                 read_unlock_bh(&idev->lock);
1351         }
1352         rcu_read_unlock();
1353         return onlink;
1354 }
1355
1356 EXPORT_SYMBOL(ipv6_chk_prefix);
1357
1358 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1359                                      struct net_device *dev, int strict)
1360 {
1361         struct inet6_ifaddr *ifp, *result = NULL;
1362         unsigned int hash = ipv6_addr_hash(addr);
1363         struct hlist_node *node;
1364
1365         rcu_read_lock_bh();
1366         hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1367                 if (!net_eq(dev_net(ifp->idev->dev), net))
1368                         continue;
1369                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1370                         if (dev == NULL || ifp->idev->dev == dev ||
1371                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1372                                 result = ifp;
1373                                 in6_ifa_hold(ifp);
1374                                 break;
1375                         }
1376                 }
1377         }
1378         rcu_read_unlock_bh();
1379
1380         return result;
1381 }
1382
1383 /* Gets referenced address, destroys ifaddr */
1384
1385 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1386 {
1387         if (ifp->flags&IFA_F_PERMANENT) {
1388                 spin_lock_bh(&ifp->lock);
1389                 addrconf_del_timer(ifp);
1390                 ifp->flags |= IFA_F_TENTATIVE;
1391                 if (dad_failed)
1392                         ifp->flags |= IFA_F_DADFAILED;
1393                 spin_unlock_bh(&ifp->lock);
1394                 if (dad_failed)
1395                         ipv6_ifa_notify(0, ifp);
1396                 in6_ifa_put(ifp);
1397 #ifdef CONFIG_IPV6_PRIVACY
1398         } else if (ifp->flags&IFA_F_TEMPORARY) {
1399                 struct inet6_ifaddr *ifpub;
1400                 spin_lock_bh(&ifp->lock);
1401                 ifpub = ifp->ifpub;
1402                 if (ifpub) {
1403                         in6_ifa_hold(ifpub);
1404                         spin_unlock_bh(&ifp->lock);
1405                         ipv6_create_tempaddr(ifpub, ifp);
1406                         in6_ifa_put(ifpub);
1407                 } else {
1408                         spin_unlock_bh(&ifp->lock);
1409                 }
1410                 ipv6_del_addr(ifp);
1411 #endif
1412         } else
1413                 ipv6_del_addr(ifp);
1414 }
1415
1416 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1417 {
1418         int err = -ENOENT;
1419
1420         spin_lock(&ifp->state_lock);
1421         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1422                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1423                 err = 0;
1424         }
1425         spin_unlock(&ifp->state_lock);
1426
1427         return err;
1428 }
1429
1430 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1431 {
1432         struct inet6_dev *idev = ifp->idev;
1433
1434         if (addrconf_dad_end(ifp)) {
1435                 in6_ifa_put(ifp);
1436                 return;
1437         }
1438
1439         if (net_ratelimit())
1440                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1441                         ifp->idev->dev->name, &ifp->addr);
1442
1443         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1444                 struct in6_addr addr;
1445
1446                 addr.s6_addr32[0] = htonl(0xfe800000);
1447                 addr.s6_addr32[1] = 0;
1448
1449                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1450                     ipv6_addr_equal(&ifp->addr, &addr)) {
1451                         /* DAD failed for link-local based on MAC address */
1452                         idev->cnf.disable_ipv6 = 1;
1453
1454                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1455                                 ifp->idev->dev->name);
1456                 }
1457         }
1458
1459         addrconf_dad_stop(ifp, 1);
1460 }
1461
1462 /* Join to solicited addr multicast group. */
1463
1464 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1465 {
1466         struct in6_addr maddr;
1467
1468         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1469                 return;
1470
1471         addrconf_addr_solict_mult(addr, &maddr);
1472         ipv6_dev_mc_inc(dev, &maddr);
1473 }
1474
1475 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1476 {
1477         struct in6_addr maddr;
1478
1479         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1480                 return;
1481
1482         addrconf_addr_solict_mult(addr, &maddr);
1483         __ipv6_dev_mc_dec(idev, &maddr);
1484 }
1485
1486 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1487 {
1488         struct in6_addr addr;
1489         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1490         if (ipv6_addr_any(&addr))
1491                 return;
1492         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1493 }
1494
1495 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1496 {
1497         struct in6_addr addr;
1498         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1499         if (ipv6_addr_any(&addr))
1500                 return;
1501         __ipv6_dev_ac_dec(ifp->idev, &addr);
1502 }
1503
1504 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1505 {
1506         if (dev->addr_len != ETH_ALEN)
1507                 return -1;
1508         memcpy(eui, dev->dev_addr, 3);
1509         memcpy(eui + 5, dev->dev_addr + 3, 3);
1510
1511         /*
1512          * The zSeries OSA network cards can be shared among various
1513          * OS instances, but the OSA cards have only one MAC address.
1514          * This leads to duplicate address conflicts in conjunction
1515          * with IPv6 if more than one instance uses the same card.
1516          *
1517          * The driver for these cards can deliver a unique 16-bit
1518          * identifier for each instance sharing the same card.  It is
1519          * placed instead of 0xFFFE in the interface identifier.  The
1520          * "u" bit of the interface identifier is not inverted in this
1521          * case.  Hence the resulting interface identifier has local
1522          * scope according to RFC2373.
1523          */
1524         if (dev->dev_id) {
1525                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1526                 eui[4] = dev->dev_id & 0xFF;
1527         } else {
1528                 eui[3] = 0xFF;
1529                 eui[4] = 0xFE;
1530                 eui[0] ^= 2;
1531         }
1532         return 0;
1533 }
1534
1535 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1536 {
1537         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1538         if (dev->addr_len != ARCNET_ALEN)
1539                 return -1;
1540         memset(eui, 0, 7);
1541         eui[7] = *(u8*)dev->dev_addr;
1542         return 0;
1543 }
1544
1545 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1546 {
1547         if (dev->addr_len != INFINIBAND_ALEN)
1548                 return -1;
1549         memcpy(eui, dev->dev_addr + 12, 8);
1550         eui[0] |= 2;
1551         return 0;
1552 }
1553
1554 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1555 {
1556         if (addr == 0)
1557                 return -1;
1558         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1559                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1560                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1561                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1562                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1563                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1564         eui[1] = 0;
1565         eui[2] = 0x5E;
1566         eui[3] = 0xFE;
1567         memcpy(eui + 4, &addr, 4);
1568         return 0;
1569 }
1570
1571 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1572 {
1573         if (dev->priv_flags & IFF_ISATAP)
1574                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1575         return -1;
1576 }
1577
1578 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1579 {
1580         switch (dev->type) {
1581         case ARPHRD_ETHER:
1582         case ARPHRD_FDDI:
1583         case ARPHRD_IEEE802_TR:
1584                 return addrconf_ifid_eui48(eui, dev);
1585         case ARPHRD_ARCNET:
1586                 return addrconf_ifid_arcnet(eui, dev);
1587         case ARPHRD_INFINIBAND:
1588                 return addrconf_ifid_infiniband(eui, dev);
1589         case ARPHRD_SIT:
1590                 return addrconf_ifid_sit(eui, dev);
1591         }
1592         return -1;
1593 }
1594
1595 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1596 {
1597         int err = -1;
1598         struct inet6_ifaddr *ifp;
1599
1600         read_lock_bh(&idev->lock);
1601         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1602                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1603                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1604                         err = 0;
1605                         break;
1606                 }
1607         }
1608         read_unlock_bh(&idev->lock);
1609         return err;
1610 }
1611
1612 #ifdef CONFIG_IPV6_PRIVACY
1613 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1614 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1615 {
1616 regen:
1617         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1618         idev->rndid[0] &= ~0x02;
1619
1620         /*
1621          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1622          * check if generated address is not inappropriate
1623          *
1624          *  - Reserved subnet anycast (RFC 2526)
1625          *      11111101 11....11 1xxxxxxx
1626          *  - ISATAP (RFC4214) 6.1
1627          *      00-00-5E-FE-xx-xx-xx-xx
1628          *  - value 0
1629          *  - XXX: already assigned to an address on the device
1630          */
1631         if (idev->rndid[0] == 0xfd &&
1632             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1633             (idev->rndid[7]&0x80))
1634                 goto regen;
1635         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1636                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1637                         goto regen;
1638                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1639                         goto regen;
1640         }
1641
1642         return 0;
1643 }
1644
1645 static void ipv6_regen_rndid(unsigned long data)
1646 {
1647         struct inet6_dev *idev = (struct inet6_dev *) data;
1648         unsigned long expires;
1649
1650         rcu_read_lock_bh();
1651         write_lock_bh(&idev->lock);
1652
1653         if (idev->dead)
1654                 goto out;
1655
1656         if (__ipv6_regen_rndid(idev) < 0)
1657                 goto out;
1658
1659         expires = jiffies +
1660                 idev->cnf.temp_prefered_lft * HZ -
1661                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1662                 idev->cnf.max_desync_factor * HZ;
1663         if (time_before(expires, jiffies)) {
1664                 printk(KERN_WARNING
1665                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1666                         idev->dev->name);
1667                 goto out;
1668         }
1669
1670         if (!mod_timer(&idev->regen_timer, expires))
1671                 in6_dev_hold(idev);
1672
1673 out:
1674         write_unlock_bh(&idev->lock);
1675         rcu_read_unlock_bh();
1676         in6_dev_put(idev);
1677 }
1678
1679 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1680         int ret = 0;
1681
1682         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1683                 ret = __ipv6_regen_rndid(idev);
1684         return ret;
1685 }
1686 #endif
1687
1688 /*
1689  *      Add prefix route.
1690  */
1691
1692 static void
1693 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1694                       unsigned long expires, u32 flags)
1695 {
1696         struct fib6_config cfg = {
1697                 .fc_table = RT6_TABLE_PREFIX,
1698                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1699                 .fc_ifindex = dev->ifindex,
1700                 .fc_expires = expires,
1701                 .fc_dst_len = plen,
1702                 .fc_flags = RTF_UP | flags,
1703                 .fc_nlinfo.nl_net = dev_net(dev),
1704                 .fc_protocol = RTPROT_KERNEL,
1705         };
1706
1707         ipv6_addr_copy(&cfg.fc_dst, pfx);
1708
1709         /* Prevent useless cloning on PtP SIT.
1710            This thing is done here expecting that the whole
1711            class of non-broadcast devices need not cloning.
1712          */
1713 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1714         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1715                 cfg.fc_flags |= RTF_NONEXTHOP;
1716 #endif
1717
1718         ip6_route_add(&cfg);
1719 }
1720
1721 /* Create "default" multicast route to the interface */
1722
1723 static void addrconf_add_mroute(struct net_device *dev)
1724 {
1725         struct fib6_config cfg = {
1726                 .fc_table = RT6_TABLE_LOCAL,
1727                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1728                 .fc_ifindex = dev->ifindex,
1729                 .fc_dst_len = 8,
1730                 .fc_flags = RTF_UP,
1731                 .fc_nlinfo.nl_net = dev_net(dev),
1732         };
1733
1734         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1735
1736         ip6_route_add(&cfg);
1737 }
1738
1739 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1740 static void sit_route_add(struct net_device *dev)
1741 {
1742         struct fib6_config cfg = {
1743                 .fc_table = RT6_TABLE_MAIN,
1744                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1745                 .fc_ifindex = dev->ifindex,
1746                 .fc_dst_len = 96,
1747                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1748                 .fc_nlinfo.nl_net = dev_net(dev),
1749         };
1750
1751         /* prefix length - 96 bits "::d.d.d.d" */
1752         ip6_route_add(&cfg);
1753 }
1754 #endif
1755
1756 static void addrconf_add_lroute(struct net_device *dev)
1757 {
1758         struct in6_addr addr;
1759
1760         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1761         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1762 }
1763
1764 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1765 {
1766         struct inet6_dev *idev;
1767
1768         ASSERT_RTNL();
1769
1770         idev = ipv6_find_idev(dev);
1771         if (!idev)
1772                 return ERR_PTR(-ENOBUFS);
1773
1774         if (idev->cnf.disable_ipv6)
1775                 return ERR_PTR(-EACCES);
1776
1777         /* Add default multicast route */
1778         addrconf_add_mroute(dev);
1779
1780         /* Add link local route */
1781         addrconf_add_lroute(dev);
1782         return idev;
1783 }
1784
1785 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1786 {
1787         struct prefix_info *pinfo;
1788         __u32 valid_lft;
1789         __u32 prefered_lft;
1790         int addr_type;
1791         struct inet6_dev *in6_dev;
1792         struct net *net = dev_net(dev);
1793
1794         pinfo = (struct prefix_info *) opt;
1795
1796         if (len < sizeof(struct prefix_info)) {
1797                 ADBG(("addrconf: prefix option too short\n"));
1798                 return;
1799         }
1800
1801         /*
1802          *      Validation checks ([ADDRCONF], page 19)
1803          */
1804
1805         addr_type = ipv6_addr_type(&pinfo->prefix);
1806
1807         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1808                 return;
1809
1810         valid_lft = ntohl(pinfo->valid);
1811         prefered_lft = ntohl(pinfo->prefered);
1812
1813         if (prefered_lft > valid_lft) {
1814                 if (net_ratelimit())
1815                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1816                 return;
1817         }
1818
1819         in6_dev = in6_dev_get(dev);
1820
1821         if (in6_dev == NULL) {
1822                 if (net_ratelimit())
1823                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1824                 return;
1825         }
1826
1827         /*
1828          *      Two things going on here:
1829          *      1) Add routes for on-link prefixes
1830          *      2) Configure prefixes with the auto flag set
1831          */
1832
1833         if (pinfo->onlink) {
1834                 struct rt6_info *rt;
1835                 unsigned long rt_expires;
1836
1837                 /* Avoid arithmetic overflow. Really, we could
1838                  * save rt_expires in seconds, likely valid_lft,
1839                  * but it would require division in fib gc, that it
1840                  * not good.
1841                  */
1842                 if (HZ > USER_HZ)
1843                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1844                 else
1845                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1846
1847                 if (addrconf_finite_timeout(rt_expires))
1848                         rt_expires *= HZ;
1849
1850                 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1851                                 dev->ifindex, 1);
1852
1853                 if (rt && addrconf_is_prefix_route(rt)) {
1854                         /* Autoconf prefix route */
1855                         if (valid_lft == 0) {
1856                                 ip6_del_rt(rt);
1857                                 rt = NULL;
1858                         } else if (addrconf_finite_timeout(rt_expires)) {
1859                                 /* not infinity */
1860                                 rt->rt6i_expires = jiffies + rt_expires;
1861                                 rt->rt6i_flags |= RTF_EXPIRES;
1862                         } else {
1863                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1864                                 rt->rt6i_expires = 0;
1865                         }
1866                 } else if (valid_lft) {
1867                         clock_t expires = 0;
1868                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1869                         if (addrconf_finite_timeout(rt_expires)) {
1870                                 /* not infinity */
1871                                 flags |= RTF_EXPIRES;
1872                                 expires = jiffies_to_clock_t(rt_expires);
1873                         }
1874                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1875                                               dev, expires, flags);
1876                 }
1877                 if (rt)
1878                         dst_release(&rt->dst);
1879         }
1880
1881         /* Try to figure out our local address for this prefix */
1882
1883         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1884                 struct inet6_ifaddr * ifp;
1885                 struct in6_addr addr;
1886                 int create = 0, update_lft = 0;
1887
1888                 if (pinfo->prefix_len == 64) {
1889                         memcpy(&addr, &pinfo->prefix, 8);
1890                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1891                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1892                                 in6_dev_put(in6_dev);
1893                                 return;
1894                         }
1895                         goto ok;
1896                 }
1897                 if (net_ratelimit())
1898                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1899                                pinfo->prefix_len);
1900                 in6_dev_put(in6_dev);
1901                 return;
1902
1903 ok:
1904
1905                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1906
1907                 if (ifp == NULL && valid_lft) {
1908                         int max_addresses = in6_dev->cnf.max_addresses;
1909                         u32 addr_flags = 0;
1910
1911 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1912                         if (in6_dev->cnf.optimistic_dad &&
1913                             !net->ipv6.devconf_all->forwarding)
1914                                 addr_flags = IFA_F_OPTIMISTIC;
1915 #endif
1916
1917                         /* Do not allow to create too much of autoconfigured
1918                          * addresses; this would be too easy way to crash kernel.
1919                          */
1920                         if (!max_addresses ||
1921                             ipv6_count_addresses(in6_dev) < max_addresses)
1922                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1923                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1924                                                     addr_flags);
1925
1926                         if (!ifp || IS_ERR(ifp)) {
1927                                 in6_dev_put(in6_dev);
1928                                 return;
1929                         }
1930
1931                         update_lft = create = 1;
1932                         ifp->cstamp = jiffies;
1933                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1934                 }
1935
1936                 if (ifp) {
1937                         int flags;
1938                         unsigned long now;
1939 #ifdef CONFIG_IPV6_PRIVACY
1940                         struct inet6_ifaddr *ift;
1941 #endif
1942                         u32 stored_lft;
1943
1944                         /* update lifetime (RFC2462 5.5.3 e) */
1945                         spin_lock(&ifp->lock);
1946                         now = jiffies;
1947                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1948                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1949                         else
1950                                 stored_lft = 0;
1951                         if (!update_lft && stored_lft) {
1952                                 if (valid_lft > MIN_VALID_LIFETIME ||
1953                                     valid_lft > stored_lft)
1954                                         update_lft = 1;
1955                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1956                                         /* valid_lft <= stored_lft is always true */
1957                                         /*
1958                                          * RFC 4862 Section 5.5.3e:
1959                                          * "Note that the preferred lifetime of
1960                                          *  the corresponding address is always
1961                                          *  reset to the Preferred Lifetime in
1962                                          *  the received Prefix Information
1963                                          *  option, regardless of whether the
1964                                          *  valid lifetime is also reset or
1965                                          *  ignored."
1966                                          *
1967                                          *  So if the preferred lifetime in
1968                                          *  this advertisement is different
1969                                          *  than what we have stored, but the
1970                                          *  valid lifetime is invalid, just
1971                                          *  reset prefered_lft.
1972                                          *
1973                                          *  We must set the valid lifetime
1974                                          *  to the stored lifetime since we'll
1975                                          *  be updating the timestamp below,
1976                                          *  else we'll set it back to the
1977                                          *  minumum.
1978                                          */
1979                                         if (prefered_lft != ifp->prefered_lft) {
1980                                                 valid_lft = stored_lft;
1981                                                 update_lft = 1;
1982                                         }
1983                                 } else {
1984                                         valid_lft = MIN_VALID_LIFETIME;
1985                                         if (valid_lft < prefered_lft)
1986                                                 prefered_lft = valid_lft;
1987                                         update_lft = 1;
1988                                 }
1989                         }
1990
1991                         if (update_lft) {
1992                                 ifp->valid_lft = valid_lft;
1993                                 ifp->prefered_lft = prefered_lft;
1994                                 ifp->tstamp = now;
1995                                 flags = ifp->flags;
1996                                 ifp->flags &= ~IFA_F_DEPRECATED;
1997                                 spin_unlock(&ifp->lock);
1998
1999                                 if (!(flags&IFA_F_TENTATIVE))
2000                                         ipv6_ifa_notify(0, ifp);
2001                         } else
2002                                 spin_unlock(&ifp->lock);
2003
2004 #ifdef CONFIG_IPV6_PRIVACY
2005                         read_lock_bh(&in6_dev->lock);
2006                         /* update all temporary addresses in the list */
2007                         list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2008                                 /*
2009                                  * When adjusting the lifetimes of an existing
2010                                  * temporary address, only lower the lifetimes.
2011                                  * Implementations must not increase the
2012                                  * lifetimes of an existing temporary address
2013                                  * when processing a Prefix Information Option.
2014                                  */
2015                                 if (ifp != ift->ifpub)
2016                                         continue;
2017
2018                                 spin_lock(&ift->lock);
2019                                 flags = ift->flags;
2020                                 if (ift->valid_lft > valid_lft &&
2021                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2022                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2023                                 if (ift->prefered_lft > prefered_lft &&
2024                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2025                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2026                                 spin_unlock(&ift->lock);
2027                                 if (!(flags&IFA_F_TENTATIVE))
2028                                         ipv6_ifa_notify(0, ift);
2029                         }
2030
2031                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2032                                 /*
2033                                  * When a new public address is created as described in [ADDRCONF],
2034                                  * also create a new temporary address. Also create a temporary
2035                                  * address if it's enabled but no temporary address currently exists.
2036                                  */
2037                                 read_unlock_bh(&in6_dev->lock);
2038                                 ipv6_create_tempaddr(ifp, NULL);
2039                         } else {
2040                                 read_unlock_bh(&in6_dev->lock);
2041                         }
2042 #endif
2043                         in6_ifa_put(ifp);
2044                         addrconf_verify(0);
2045                 }
2046         }
2047         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2048         in6_dev_put(in6_dev);
2049 }
2050
2051 /*
2052  *      Set destination address.
2053  *      Special case for SIT interfaces where we create a new "virtual"
2054  *      device.
2055  */
2056 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2057 {
2058         struct in6_ifreq ireq;
2059         struct net_device *dev;
2060         int err = -EINVAL;
2061
2062         rtnl_lock();
2063
2064         err = -EFAULT;
2065         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2066                 goto err_exit;
2067
2068         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2069
2070         err = -ENODEV;
2071         if (dev == NULL)
2072                 goto err_exit;
2073
2074 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2075         if (dev->type == ARPHRD_SIT) {
2076                 const struct net_device_ops *ops = dev->netdev_ops;
2077                 struct ifreq ifr;
2078                 struct ip_tunnel_parm p;
2079
2080                 err = -EADDRNOTAVAIL;
2081                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2082                         goto err_exit;
2083
2084                 memset(&p, 0, sizeof(p));
2085                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2086                 p.iph.saddr = 0;
2087                 p.iph.version = 4;
2088                 p.iph.ihl = 5;
2089                 p.iph.protocol = IPPROTO_IPV6;
2090                 p.iph.ttl = 64;
2091                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2092
2093                 if (ops->ndo_do_ioctl) {
2094                         mm_segment_t oldfs = get_fs();
2095
2096                         set_fs(KERNEL_DS);
2097                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2098                         set_fs(oldfs);
2099                 } else
2100                         err = -EOPNOTSUPP;
2101
2102                 if (err == 0) {
2103                         err = -ENOBUFS;
2104                         dev = __dev_get_by_name(net, p.name);
2105                         if (!dev)
2106                                 goto err_exit;
2107                         err = dev_open(dev);
2108                 }
2109         }
2110 #endif
2111
2112 err_exit:
2113         rtnl_unlock();
2114         return err;
2115 }
2116
2117 /*
2118  *      Manual configuration of address on an interface
2119  */
2120 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2121                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2122                           __u32 valid_lft)
2123 {
2124         struct inet6_ifaddr *ifp;
2125         struct inet6_dev *idev;
2126         struct net_device *dev;
2127         int scope;
2128         u32 flags;
2129         clock_t expires;
2130         unsigned long timeout;
2131
2132         ASSERT_RTNL();
2133
2134         if (plen > 128)
2135                 return -EINVAL;
2136
2137         /* check the lifetime */
2138         if (!valid_lft || prefered_lft > valid_lft)
2139                 return -EINVAL;
2140
2141         dev = __dev_get_by_index(net, ifindex);
2142         if (!dev)
2143                 return -ENODEV;
2144
2145         idev = addrconf_add_dev(dev);
2146         if (IS_ERR(idev))
2147                 return PTR_ERR(idev);
2148
2149         scope = ipv6_addr_scope(pfx);
2150
2151         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2152         if (addrconf_finite_timeout(timeout)) {
2153                 expires = jiffies_to_clock_t(timeout * HZ);
2154                 valid_lft = timeout;
2155                 flags = RTF_EXPIRES;
2156         } else {
2157                 expires = 0;
2158                 flags = 0;
2159                 ifa_flags |= IFA_F_PERMANENT;
2160         }
2161
2162         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2163         if (addrconf_finite_timeout(timeout)) {
2164                 if (timeout == 0)
2165                         ifa_flags |= IFA_F_DEPRECATED;
2166                 prefered_lft = timeout;
2167         }
2168
2169         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2170
2171         if (!IS_ERR(ifp)) {
2172                 spin_lock_bh(&ifp->lock);
2173                 ifp->valid_lft = valid_lft;
2174                 ifp->prefered_lft = prefered_lft;
2175                 ifp->tstamp = jiffies;
2176                 spin_unlock_bh(&ifp->lock);
2177
2178                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2179                                       expires, flags);
2180                 /*
2181                  * Note that section 3.1 of RFC 4429 indicates
2182                  * that the Optimistic flag should not be set for
2183                  * manually configured addresses
2184                  */
2185                 addrconf_dad_start(ifp, 0);
2186                 in6_ifa_put(ifp);
2187                 addrconf_verify(0);
2188                 return 0;
2189         }
2190
2191         return PTR_ERR(ifp);
2192 }
2193
2194 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2195                           unsigned int plen)
2196 {
2197         struct inet6_ifaddr *ifp;
2198         struct inet6_dev *idev;
2199         struct net_device *dev;
2200
2201         if (plen > 128)
2202                 return -EINVAL;
2203
2204         dev = __dev_get_by_index(net, ifindex);
2205         if (!dev)
2206                 return -ENODEV;
2207
2208         if ((idev = __in6_dev_get(dev)) == NULL)
2209                 return -ENXIO;
2210
2211         read_lock_bh(&idev->lock);
2212         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2213                 if (ifp->prefix_len == plen &&
2214                     ipv6_addr_equal(pfx, &ifp->addr)) {
2215                         in6_ifa_hold(ifp);
2216                         read_unlock_bh(&idev->lock);
2217
2218                         ipv6_del_addr(ifp);
2219
2220                         /* If the last address is deleted administratively,
2221                            disable IPv6 on this interface.
2222                          */
2223                         if (list_empty(&idev->addr_list))
2224                                 addrconf_ifdown(idev->dev, 1);
2225                         return 0;
2226                 }
2227         }
2228         read_unlock_bh(&idev->lock);
2229         return -EADDRNOTAVAIL;
2230 }
2231
2232
2233 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2234 {
2235         struct in6_ifreq ireq;
2236         int err;
2237
2238         if (!capable(CAP_NET_ADMIN))
2239                 return -EPERM;
2240
2241         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2242                 return -EFAULT;
2243
2244         rtnl_lock();
2245         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2246                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2247                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2248         rtnl_unlock();
2249         return err;
2250 }
2251
2252 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2253 {
2254         struct in6_ifreq ireq;
2255         int err;
2256
2257         if (!capable(CAP_NET_ADMIN))
2258                 return -EPERM;
2259
2260         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2261                 return -EFAULT;
2262
2263         rtnl_lock();
2264         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2265                              ireq.ifr6_prefixlen);
2266         rtnl_unlock();
2267         return err;
2268 }
2269
2270 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2271                      int plen, int scope)
2272 {
2273         struct inet6_ifaddr *ifp;
2274
2275         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2276         if (!IS_ERR(ifp)) {
2277                 spin_lock_bh(&ifp->lock);
2278                 ifp->flags &= ~IFA_F_TENTATIVE;
2279                 spin_unlock_bh(&ifp->lock);
2280                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2281                 in6_ifa_put(ifp);
2282         }
2283 }
2284
2285 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2286 static void sit_add_v4_addrs(struct inet6_dev *idev)
2287 {
2288         struct in6_addr addr;
2289         struct net_device *dev;
2290         struct net *net = dev_net(idev->dev);
2291         int scope;
2292
2293         ASSERT_RTNL();
2294
2295         memset(&addr, 0, sizeof(struct in6_addr));
2296         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2297
2298         if (idev->dev->flags&IFF_POINTOPOINT) {
2299                 addr.s6_addr32[0] = htonl(0xfe800000);
2300                 scope = IFA_LINK;
2301         } else {
2302                 scope = IPV6_ADDR_COMPATv4;
2303         }
2304
2305         if (addr.s6_addr32[3]) {
2306                 add_addr(idev, &addr, 128, scope);
2307                 return;
2308         }
2309
2310         for_each_netdev(net, dev) {
2311                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2312                 if (in_dev && (dev->flags & IFF_UP)) {
2313                         struct in_ifaddr * ifa;
2314
2315                         int flag = scope;
2316
2317                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2318                                 int plen;
2319
2320                                 addr.s6_addr32[3] = ifa->ifa_local;
2321
2322                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2323                                         continue;
2324                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2325                                         if (idev->dev->flags&IFF_POINTOPOINT)
2326                                                 continue;
2327                                         flag |= IFA_HOST;
2328                                 }
2329                                 if (idev->dev->flags&IFF_POINTOPOINT)
2330                                         plen = 64;
2331                                 else
2332                                         plen = 96;
2333
2334                                 add_addr(idev, &addr, plen, flag);
2335                         }
2336                 }
2337         }
2338 }
2339 #endif
2340
2341 static void init_loopback(struct net_device *dev)
2342 {
2343         struct inet6_dev  *idev;
2344
2345         /* ::1 */
2346
2347         ASSERT_RTNL();
2348
2349         if ((idev = ipv6_find_idev(dev)) == NULL) {
2350                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2351                 return;
2352         }
2353
2354         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2355 }
2356
2357 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2358 {
2359         struct inet6_ifaddr * ifp;
2360         u32 addr_flags = IFA_F_PERMANENT;
2361
2362 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2363         if (idev->cnf.optimistic_dad &&
2364             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2365                 addr_flags |= IFA_F_OPTIMISTIC;
2366 #endif
2367
2368
2369         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2370         if (!IS_ERR(ifp)) {
2371                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2372                 addrconf_dad_start(ifp, 0);
2373                 in6_ifa_put(ifp);
2374         }
2375 }
2376
2377 static void addrconf_dev_config(struct net_device *dev)
2378 {
2379         struct in6_addr addr;
2380         struct inet6_dev    * idev;
2381
2382         ASSERT_RTNL();
2383
2384         if ((dev->type != ARPHRD_ETHER) &&
2385             (dev->type != ARPHRD_FDDI) &&
2386             (dev->type != ARPHRD_IEEE802_TR) &&
2387             (dev->type != ARPHRD_ARCNET) &&
2388             (dev->type != ARPHRD_INFINIBAND)) {
2389                 /* Alas, we support only Ethernet autoconfiguration. */
2390                 return;
2391         }
2392
2393         idev = addrconf_add_dev(dev);
2394         if (IS_ERR(idev))
2395                 return;
2396
2397         memset(&addr, 0, sizeof(struct in6_addr));
2398         addr.s6_addr32[0] = htonl(0xFE800000);
2399
2400         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2401                 addrconf_add_linklocal(idev, &addr);
2402 }
2403
2404 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2405 static void addrconf_sit_config(struct net_device *dev)
2406 {
2407         struct inet6_dev *idev;
2408
2409         ASSERT_RTNL();
2410
2411         /*
2412          * Configure the tunnel with one of our IPv4
2413          * addresses... we should configure all of
2414          * our v4 addrs in the tunnel
2415          */
2416
2417         if ((idev = ipv6_find_idev(dev)) == NULL) {
2418                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2419                 return;
2420         }
2421
2422         if (dev->priv_flags & IFF_ISATAP) {
2423                 struct in6_addr addr;
2424
2425                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2426                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2427                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2428                         addrconf_add_linklocal(idev, &addr);
2429                 return;
2430         }
2431
2432         sit_add_v4_addrs(idev);
2433
2434         if (dev->flags&IFF_POINTOPOINT) {
2435                 addrconf_add_mroute(dev);
2436                 addrconf_add_lroute(dev);
2437         } else
2438                 sit_route_add(dev);
2439 }
2440 #endif
2441
2442 static inline int
2443 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2444 {
2445         struct in6_addr lladdr;
2446
2447         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2448                 addrconf_add_linklocal(idev, &lladdr);
2449                 return 0;
2450         }
2451         return -1;
2452 }
2453
2454 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2455 {
2456         struct net_device *link_dev;
2457         struct net *net = dev_net(idev->dev);
2458
2459         /* first try to inherit the link-local address from the link device */
2460         if (idev->dev->iflink &&
2461             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2462                 if (!ipv6_inherit_linklocal(idev, link_dev))
2463                         return;
2464         }
2465         /* then try to inherit it from any device */
2466         for_each_netdev(net, link_dev) {
2467                 if (!ipv6_inherit_linklocal(idev, link_dev))
2468                         return;
2469         }
2470         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2471 }
2472
2473 /*
2474  * Autoconfigure tunnel with a link-local address so routing protocols,
2475  * DHCPv6, MLD etc. can be run over the virtual link
2476  */
2477
2478 static void addrconf_ip6_tnl_config(struct net_device *dev)
2479 {
2480         struct inet6_dev *idev;
2481
2482         ASSERT_RTNL();
2483
2484         idev = addrconf_add_dev(dev);
2485         if (IS_ERR(idev)) {
2486                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2487                 return;
2488         }
2489         ip6_tnl_add_linklocal(idev);
2490 }
2491
2492 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2493                            void * data)
2494 {
2495         struct net_device *dev = (struct net_device *) data;
2496         struct inet6_dev *idev = __in6_dev_get(dev);
2497         int run_pending = 0;
2498         int err;
2499
2500         switch (event) {
2501         case NETDEV_REGISTER:
2502                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2503                         idev = ipv6_add_dev(dev);
2504                         if (!idev)
2505                                 return notifier_from_errno(-ENOMEM);
2506                 }
2507                 break;
2508
2509         case NETDEV_UP:
2510         case NETDEV_CHANGE:
2511                 if (dev->flags & IFF_SLAVE)
2512                         break;
2513
2514                 if (event == NETDEV_UP) {
2515                         if (!addrconf_qdisc_ok(dev)) {
2516                                 /* device is not ready yet. */
2517                                 printk(KERN_INFO
2518                                         "ADDRCONF(NETDEV_UP): %s: "
2519                                         "link is not ready\n",
2520                                         dev->name);
2521                                 break;
2522                         }
2523
2524                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2525                                 idev = ipv6_add_dev(dev);
2526
2527                         if (idev) {
2528                                 idev->if_flags |= IF_READY;
2529                                 run_pending = 1;
2530                         }
2531                 } else {
2532                         if (!addrconf_qdisc_ok(dev)) {
2533                                 /* device is still not ready. */
2534                                 break;
2535                         }
2536
2537                         if (idev) {
2538                                 if (idev->if_flags & IF_READY)
2539                                         /* device is already configured. */
2540                                         break;
2541                                 idev->if_flags |= IF_READY;
2542                         }
2543
2544                         printk(KERN_INFO
2545                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2546                                         "link becomes ready\n",
2547                                         dev->name);
2548
2549                         run_pending = 1;
2550                 }
2551
2552                 switch (dev->type) {
2553 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2554                 case ARPHRD_SIT:
2555                         addrconf_sit_config(dev);
2556                         break;
2557 #endif
2558                 case ARPHRD_TUNNEL6:
2559                         addrconf_ip6_tnl_config(dev);
2560                         break;
2561                 case ARPHRD_LOOPBACK:
2562                         init_loopback(dev);
2563                         break;
2564
2565                 default:
2566                         addrconf_dev_config(dev);
2567                         break;
2568                 }
2569
2570                 if (idev) {
2571                         if (run_pending)
2572                                 addrconf_dad_run(idev);
2573
2574                         /*
2575                          * If the MTU changed during the interface down,
2576                          * when the interface up, the changed MTU must be
2577                          * reflected in the idev as well as routers.
2578                          */
2579                         if (idev->cnf.mtu6 != dev->mtu &&
2580                             dev->mtu >= IPV6_MIN_MTU) {
2581                                 rt6_mtu_change(dev, dev->mtu);
2582                                 idev->cnf.mtu6 = dev->mtu;
2583                         }
2584                         idev->tstamp = jiffies;
2585                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2586
2587                         /*
2588                          * If the changed mtu during down is lower than
2589                          * IPV6_MIN_MTU stop IPv6 on this interface.
2590                          */
2591                         if (dev->mtu < IPV6_MIN_MTU)
2592                                 addrconf_ifdown(dev, 1);
2593                 }
2594                 break;
2595
2596         case NETDEV_CHANGEMTU:
2597                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2598                         rt6_mtu_change(dev, dev->mtu);
2599                         idev->cnf.mtu6 = dev->mtu;
2600                         break;
2601                 }
2602
2603                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2604                         idev = ipv6_add_dev(dev);
2605                         if (idev)
2606                                 break;
2607                 }
2608
2609                 /*
2610                  * MTU falled under IPV6_MIN_MTU.
2611                  * Stop IPv6 on this interface.
2612                  */
2613
2614         case NETDEV_DOWN:
2615         case NETDEV_UNREGISTER:
2616                 /*
2617                  *      Remove all addresses from this interface.
2618                  */
2619                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2620                 break;
2621
2622         case NETDEV_CHANGENAME:
2623                 if (idev) {
2624                         snmp6_unregister_dev(idev);
2625                         addrconf_sysctl_unregister(idev);
2626                         addrconf_sysctl_register(idev);
2627                         err = snmp6_register_dev(idev);
2628                         if (err)
2629                                 return notifier_from_errno(err);
2630                 }
2631                 break;
2632
2633         case NETDEV_PRE_TYPE_CHANGE:
2634         case NETDEV_POST_TYPE_CHANGE:
2635                 addrconf_type_change(dev, event);
2636                 break;
2637         }
2638
2639         return NOTIFY_OK;
2640 }
2641
2642 /*
2643  *      addrconf module should be notified of a device going up
2644  */
2645 static struct notifier_block ipv6_dev_notf = {
2646         .notifier_call = addrconf_notify,
2647 };
2648
2649 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2650 {
2651         struct inet6_dev *idev;
2652         ASSERT_RTNL();
2653
2654         idev = __in6_dev_get(dev);
2655
2656         if (event == NETDEV_POST_TYPE_CHANGE)
2657                 ipv6_mc_remap(idev);
2658         else if (event == NETDEV_PRE_TYPE_CHANGE)
2659                 ipv6_mc_unmap(idev);
2660 }
2661
2662 static int addrconf_ifdown(struct net_device *dev, int how)
2663 {
2664         struct net *net = dev_net(dev);
2665         struct inet6_dev *idev;
2666         struct inet6_ifaddr *ifa;
2667         LIST_HEAD(keep_list);
2668         int state;
2669
2670         ASSERT_RTNL();
2671
2672         /* Flush routes if device is being removed or it is not loopback */
2673         if (how || !(dev->flags & IFF_LOOPBACK))
2674                 rt6_ifdown(net, dev);
2675
2676         idev = __in6_dev_get(dev);
2677         if (idev == NULL)
2678                 return -ENODEV;
2679
2680         /*
2681          * Step 1: remove reference to ipv6 device from parent device.
2682          *         Do not dev_put!
2683          */
2684         if (how) {
2685                 idev->dead = 1;
2686
2687                 /* protected by rtnl_lock */
2688                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2689
2690                 /* Step 1.5: remove snmp6 entry */
2691                 snmp6_unregister_dev(idev);
2692
2693         }
2694
2695         write_lock_bh(&idev->lock);
2696
2697         /* Step 2: clear flags for stateless addrconf */
2698         if (!how)
2699                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2700
2701 #ifdef CONFIG_IPV6_PRIVACY
2702         if (how && del_timer(&idev->regen_timer))
2703                 in6_dev_put(idev);
2704
2705         /* Step 3: clear tempaddr list */
2706         while (!list_empty(&idev->tempaddr_list)) {
2707                 ifa = list_first_entry(&idev->tempaddr_list,
2708                                        struct inet6_ifaddr, tmp_list);
2709                 list_del(&ifa->tmp_list);
2710                 write_unlock_bh(&idev->lock);
2711                 spin_lock_bh(&ifa->lock);
2712
2713                 if (ifa->ifpub) {
2714                         in6_ifa_put(ifa->ifpub);
2715                         ifa->ifpub = NULL;
2716                 }
2717                 spin_unlock_bh(&ifa->lock);
2718                 in6_ifa_put(ifa);
2719                 write_lock_bh(&idev->lock);
2720         }
2721 #endif
2722
2723         while (!list_empty(&idev->addr_list)) {
2724                 ifa = list_first_entry(&idev->addr_list,
2725                                        struct inet6_ifaddr, if_list);
2726                 addrconf_del_timer(ifa);
2727
2728                 /* If just doing link down, and address is permanent
2729                    and not link-local, then retain it. */
2730                 if (!how &&
2731                     (ifa->flags&IFA_F_PERMANENT) &&
2732                     !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2733                         list_move_tail(&ifa->if_list, &keep_list);
2734
2735                         /* If not doing DAD on this address, just keep it. */
2736                         if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2737                             idev->cnf.accept_dad <= 0 ||
2738                             (ifa->flags & IFA_F_NODAD))
2739                                 continue;
2740
2741                         /* If it was tentative already, no need to notify */
2742                         if (ifa->flags & IFA_F_TENTATIVE)
2743                                 continue;
2744
2745                         /* Flag it for later restoration when link comes up */
2746                         ifa->flags |= IFA_F_TENTATIVE;
2747                         ifa->state = INET6_IFADDR_STATE_DAD;
2748                 } else {
2749                         list_del(&ifa->if_list);
2750
2751                         /* clear hash table */
2752                         spin_lock_bh(&addrconf_hash_lock);
2753                         hlist_del_init_rcu(&ifa->addr_lst);
2754                         spin_unlock_bh(&addrconf_hash_lock);
2755
2756                         write_unlock_bh(&idev->lock);
2757                         spin_lock_bh(&ifa->state_lock);
2758                         state = ifa->state;
2759                         ifa->state = INET6_IFADDR_STATE_DEAD;
2760                         spin_unlock_bh(&ifa->state_lock);
2761
2762                         if (state != INET6_IFADDR_STATE_DEAD) {
2763                                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2764                                 atomic_notifier_call_chain(&inet6addr_chain,
2765                                                            NETDEV_DOWN, ifa);
2766                         }
2767
2768                         in6_ifa_put(ifa);
2769                         write_lock_bh(&idev->lock);
2770                 }
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 = cstamp_delta(cstamp);
3453         ci.tstamp = cstamp_delta(tstamp);
3454         ci.ifa_prefered = preferred;
3455         ci.ifa_valid = valid;
3456
3457         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3458 }
3459
3460 static inline int rt_scope(int ifa_scope)
3461 {
3462         if (ifa_scope & IFA_HOST)
3463                 return RT_SCOPE_HOST;
3464         else if (ifa_scope & IFA_LINK)
3465                 return RT_SCOPE_LINK;
3466         else if (ifa_scope & IFA_SITE)
3467                 return RT_SCOPE_SITE;
3468         else
3469                 return RT_SCOPE_UNIVERSE;
3470 }
3471
3472 static inline int inet6_ifaddr_msgsize(void)
3473 {
3474         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3475                + nla_total_size(16) /* IFA_ADDRESS */
3476                + nla_total_size(sizeof(struct ifa_cacheinfo));
3477 }
3478
3479 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3480                              u32 pid, u32 seq, int event, unsigned int flags)
3481 {
3482         struct nlmsghdr  *nlh;
3483         u32 preferred, valid;
3484
3485         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3486         if (nlh == NULL)
3487                 return -EMSGSIZE;
3488
3489         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3490                       ifa->idev->dev->ifindex);
3491
3492         if (!(ifa->flags&IFA_F_PERMANENT)) {
3493                 preferred = ifa->prefered_lft;
3494                 valid = ifa->valid_lft;
3495                 if (preferred != INFINITY_LIFE_TIME) {
3496                         long tval = (jiffies - ifa->tstamp)/HZ;
3497                         if (preferred > tval)
3498                                 preferred -= tval;
3499                         else
3500                                 preferred = 0;
3501                         if (valid != INFINITY_LIFE_TIME) {
3502                                 if (valid > tval)
3503                                         valid -= tval;
3504                                 else
3505                                         valid = 0;
3506                         }
3507                 }
3508         } else {
3509                 preferred = INFINITY_LIFE_TIME;
3510                 valid = INFINITY_LIFE_TIME;
3511         }
3512
3513         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3514             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3515                 nlmsg_cancel(skb, nlh);
3516                 return -EMSGSIZE;
3517         }
3518
3519         return nlmsg_end(skb, nlh);
3520 }
3521
3522 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3523                                 u32 pid, u32 seq, int event, u16 flags)
3524 {
3525         struct nlmsghdr  *nlh;
3526         u8 scope = RT_SCOPE_UNIVERSE;
3527         int ifindex = ifmca->idev->dev->ifindex;
3528
3529         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3530                 scope = RT_SCOPE_SITE;
3531
3532         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3533         if (nlh == NULL)
3534                 return -EMSGSIZE;
3535
3536         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3537         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3538             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3539                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3540                 nlmsg_cancel(skb, nlh);
3541                 return -EMSGSIZE;
3542         }
3543
3544         return nlmsg_end(skb, nlh);
3545 }
3546
3547 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3548                                 u32 pid, u32 seq, int event, unsigned int flags)
3549 {
3550         struct nlmsghdr  *nlh;
3551         u8 scope = RT_SCOPE_UNIVERSE;
3552         int ifindex = ifaca->aca_idev->dev->ifindex;
3553
3554         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3555                 scope = RT_SCOPE_SITE;
3556
3557         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3558         if (nlh == NULL)
3559                 return -EMSGSIZE;
3560
3561         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3562         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3563             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3564                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3565                 nlmsg_cancel(skb, nlh);
3566                 return -EMSGSIZE;
3567         }
3568
3569         return nlmsg_end(skb, nlh);
3570 }
3571
3572 enum addr_type_t {
3573         UNICAST_ADDR,
3574         MULTICAST_ADDR,
3575         ANYCAST_ADDR,
3576 };
3577
3578 /* called with rcu_read_lock() */
3579 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3580                           struct netlink_callback *cb, enum addr_type_t type,
3581                           int s_ip_idx, int *p_ip_idx)
3582 {
3583         struct ifmcaddr6 *ifmca;
3584         struct ifacaddr6 *ifaca;
3585         int err = 1;
3586         int ip_idx = *p_ip_idx;
3587
3588         read_lock_bh(&idev->lock);
3589         switch (type) {
3590         case UNICAST_ADDR: {
3591                 struct inet6_ifaddr *ifa;
3592
3593                 /* unicast address incl. temp addr */
3594                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3595                         if (++ip_idx < s_ip_idx)
3596                                 continue;
3597                         err = inet6_fill_ifaddr(skb, ifa,
3598                                                 NETLINK_CB(cb->skb).pid,
3599                                                 cb->nlh->nlmsg_seq,
3600                                                 RTM_NEWADDR,
3601                                                 NLM_F_MULTI);
3602                         if (err <= 0)
3603                                 break;
3604                 }
3605                 break;
3606         }
3607         case MULTICAST_ADDR:
3608                 /* multicast address */
3609                 for (ifmca = idev->mc_list; ifmca;
3610                      ifmca = ifmca->next, ip_idx++) {
3611                         if (ip_idx < s_ip_idx)
3612                                 continue;
3613                         err = inet6_fill_ifmcaddr(skb, ifmca,
3614                                                   NETLINK_CB(cb->skb).pid,
3615                                                   cb->nlh->nlmsg_seq,
3616                                                   RTM_GETMULTICAST,
3617                                                   NLM_F_MULTI);
3618                         if (err <= 0)
3619                                 break;
3620                 }
3621                 break;
3622         case ANYCAST_ADDR:
3623                 /* anycast address */
3624                 for (ifaca = idev->ac_list; ifaca;
3625                      ifaca = ifaca->aca_next, ip_idx++) {
3626                         if (ip_idx < s_ip_idx)
3627                                 continue;
3628                         err = inet6_fill_ifacaddr(skb, ifaca,
3629                                                   NETLINK_CB(cb->skb).pid,
3630                                                   cb->nlh->nlmsg_seq,
3631                                                   RTM_GETANYCAST,
3632                                                   NLM_F_MULTI);
3633                         if (err <= 0)
3634                                 break;
3635                 }
3636                 break;
3637         default:
3638                 break;
3639         }
3640         read_unlock_bh(&idev->lock);
3641         *p_ip_idx = ip_idx;
3642         return err;
3643 }
3644
3645 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3646                            enum addr_type_t type)
3647 {
3648         struct net *net = sock_net(skb->sk);
3649         int h, s_h;
3650         int idx, ip_idx;
3651         int s_idx, s_ip_idx;
3652         struct net_device *dev;
3653         struct inet6_dev *idev;
3654         struct hlist_head *head;
3655         struct hlist_node *node;
3656
3657         s_h = cb->args[0];
3658         s_idx = idx = cb->args[1];
3659         s_ip_idx = ip_idx = cb->args[2];
3660
3661         rcu_read_lock();
3662         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3663                 idx = 0;
3664                 head = &net->dev_index_head[h];
3665                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3666                         if (idx < s_idx)
3667                                 goto cont;
3668                         if (h > s_h || idx > s_idx)
3669                                 s_ip_idx = 0;
3670                         ip_idx = 0;
3671                         idev = __in6_dev_get(dev);
3672                         if (!idev)
3673                                 goto cont;
3674
3675                         if (in6_dump_addrs(idev, skb, cb, type,
3676                                            s_ip_idx, &ip_idx) <= 0)
3677                                 goto done;
3678 cont:
3679                         idx++;
3680                 }
3681         }
3682 done:
3683         rcu_read_unlock();
3684         cb->args[0] = h;
3685         cb->args[1] = idx;
3686         cb->args[2] = ip_idx;
3687
3688         return skb->len;
3689 }
3690
3691 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3692 {
3693         enum addr_type_t type = UNICAST_ADDR;
3694
3695         return inet6_dump_addr(skb, cb, type);
3696 }
3697
3698 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3699 {
3700         enum addr_type_t type = MULTICAST_ADDR;
3701
3702         return inet6_dump_addr(skb, cb, type);
3703 }
3704
3705
3706 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3707 {
3708         enum addr_type_t type = ANYCAST_ADDR;
3709
3710         return inet6_dump_addr(skb, cb, type);
3711 }
3712
3713 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3714                              void *arg)
3715 {
3716         struct net *net = sock_net(in_skb->sk);
3717         struct ifaddrmsg *ifm;
3718         struct nlattr *tb[IFA_MAX+1];
3719         struct in6_addr *addr = NULL;
3720         struct net_device *dev = NULL;
3721         struct inet6_ifaddr *ifa;
3722         struct sk_buff *skb;
3723         int err;
3724
3725         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3726         if (err < 0)
3727                 goto errout;
3728
3729         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3730         if (addr == NULL) {
3731                 err = -EINVAL;
3732                 goto errout;
3733         }
3734
3735         ifm = nlmsg_data(nlh);
3736         if (ifm->ifa_index)
3737                 dev = __dev_get_by_index(net, ifm->ifa_index);
3738
3739         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3740         if (!ifa) {
3741                 err = -EADDRNOTAVAIL;
3742                 goto errout;
3743         }
3744
3745         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3746         if (!skb) {
3747                 err = -ENOBUFS;
3748                 goto errout_ifa;
3749         }
3750
3751         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3752                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3753         if (err < 0) {
3754                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3755                 WARN_ON(err == -EMSGSIZE);
3756                 kfree_skb(skb);
3757                 goto errout_ifa;
3758         }
3759         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3760 errout_ifa:
3761         in6_ifa_put(ifa);
3762 errout:
3763         return err;
3764 }
3765
3766 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3767 {
3768         struct sk_buff *skb;
3769         struct net *net = dev_net(ifa->idev->dev);
3770         int err = -ENOBUFS;
3771
3772         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3773         if (skb == NULL)
3774                 goto errout;
3775
3776         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3777         if (err < 0) {
3778                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3779                 WARN_ON(err == -EMSGSIZE);
3780                 kfree_skb(skb);
3781                 goto errout;
3782         }
3783         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3784         return;
3785 errout:
3786         if (err < 0)
3787                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3788 }
3789
3790 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3791                                 __s32 *array, int bytes)
3792 {
3793         BUG_ON(bytes < (DEVCONF_MAX * 4));
3794
3795         memset(array, 0, bytes);
3796         array[DEVCONF_FORWARDING] = cnf->forwarding;
3797         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3798         array[DEVCONF_MTU6] = cnf->mtu6;
3799         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3800         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3801         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3802         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3803         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3804         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3805                 jiffies_to_msecs(cnf->rtr_solicit_interval);
3806         array[DEVCONF_RTR_SOLICIT_DELAY] =
3807                 jiffies_to_msecs(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] =
3822                 jiffies_to_msecs(cnf->rtr_probe_interval);
3823 #ifdef CONFIG_IPV6_ROUTE_INFO
3824         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3825 #endif
3826 #endif
3827         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3828         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3829 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3830         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3831 #endif
3832 #ifdef CONFIG_IPV6_MROUTE
3833         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3834 #endif
3835         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3836         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3837         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3838 }
3839
3840 static inline size_t inet6_ifla6_size(void)
3841 {
3842         return nla_total_size(4) /* IFLA_INET6_FLAGS */
3843              + nla_total_size(sizeof(struct ifla_cacheinfo))
3844              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3845              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3846              + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3847 }
3848
3849 static inline size_t inet6_if_nlmsg_size(void)
3850 {
3851         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3852                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3853                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3854                + nla_total_size(4) /* IFLA_MTU */
3855                + nla_total_size(4) /* IFLA_LINK */
3856                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3857 }
3858
3859 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3860                                       int items, int bytes)
3861 {
3862         int i;
3863         int pad = bytes - sizeof(u64) * items;
3864         BUG_ON(pad < 0);
3865
3866         /* Use put_unaligned() because stats may not be aligned for u64. */
3867         put_unaligned(items, &stats[0]);
3868         for (i = 1; i < items; i++)
3869                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3870
3871         memset(&stats[items], 0, pad);
3872 }
3873
3874 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3875                                       int items, int bytes, size_t syncpoff)
3876 {
3877         int i;
3878         int pad = bytes - sizeof(u64) * items;
3879         BUG_ON(pad < 0);
3880
3881         /* Use put_unaligned() because stats may not be aligned for u64. */
3882         put_unaligned(items, &stats[0]);
3883         for (i = 1; i < items; i++)
3884                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3885
3886         memset(&stats[items], 0, pad);
3887 }
3888
3889 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3890                              int bytes)
3891 {
3892         switch (attrtype) {
3893         case IFLA_INET6_STATS:
3894                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3895                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3896                 break;
3897         case IFLA_INET6_ICMP6STATS:
3898                 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3899                 break;
3900         }
3901 }
3902
3903 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3904 {
3905         struct nlattr *nla;
3906         struct ifla_cacheinfo ci;
3907
3908         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3909
3910         ci.max_reasm_len = IPV6_MAXPLEN;
3911         ci.tstamp = cstamp_delta(idev->tstamp);
3912         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3913         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3914         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3915
3916         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3917         if (nla == NULL)
3918                 goto nla_put_failure;
3919         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3920
3921         /* XXX - MC not implemented */
3922
3923         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3924         if (nla == NULL)
3925                 goto nla_put_failure;
3926         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3927
3928         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3929         if (nla == NULL)
3930                 goto nla_put_failure;
3931         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3932
3933         return 0;
3934
3935 nla_put_failure:
3936         return -EMSGSIZE;
3937 }
3938
3939 static size_t inet6_get_link_af_size(const struct net_device *dev)
3940 {
3941         if (!__in6_dev_get(dev))
3942                 return 0;
3943
3944         return inet6_ifla6_size();
3945 }
3946
3947 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3948 {
3949         struct inet6_dev *idev = __in6_dev_get(dev);
3950
3951         if (!idev)
3952                 return -ENODATA;
3953
3954         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3955                 return -EMSGSIZE;
3956
3957         return 0;
3958 }
3959
3960 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3961                              u32 pid, u32 seq, int event, unsigned int flags)
3962 {
3963         struct net_device *dev = idev->dev;
3964         struct ifinfomsg *hdr;
3965         struct nlmsghdr *nlh;
3966         void *protoinfo;
3967
3968         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3969         if (nlh == NULL)
3970                 return -EMSGSIZE;
3971
3972         hdr = nlmsg_data(nlh);
3973         hdr->ifi_family = AF_INET6;
3974         hdr->__ifi_pad = 0;
3975         hdr->ifi_type = dev->type;
3976         hdr->ifi_index = dev->ifindex;
3977         hdr->ifi_flags = dev_get_flags(dev);
3978         hdr->ifi_change = 0;
3979
3980         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3981
3982         if (dev->addr_len)
3983                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3984
3985         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3986         if (dev->ifindex != dev->iflink)
3987                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3988
3989         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3990         if (protoinfo == NULL)
3991                 goto nla_put_failure;
3992
3993         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3994                 goto nla_put_failure;
3995
3996         nla_nest_end(skb, protoinfo);
3997         return nlmsg_end(skb, nlh);
3998
3999 nla_put_failure:
4000         nlmsg_cancel(skb, nlh);
4001         return -EMSGSIZE;
4002 }
4003
4004 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4005 {
4006         struct net *net = sock_net(skb->sk);
4007         int h, s_h;
4008         int idx = 0, s_idx;
4009         struct net_device *dev;
4010         struct inet6_dev *idev;
4011         struct hlist_head *head;
4012         struct hlist_node *node;
4013
4014         s_h = cb->args[0];
4015         s_idx = cb->args[1];
4016
4017         rcu_read_lock();
4018         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4019                 idx = 0;
4020                 head = &net->dev_index_head[h];
4021                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4022                         if (idx < s_idx)
4023                                 goto cont;
4024                         idev = __in6_dev_get(dev);
4025                         if (!idev)
4026                                 goto cont;
4027                         if (inet6_fill_ifinfo(skb, idev,
4028                                               NETLINK_CB(cb->skb).pid,
4029                                               cb->nlh->nlmsg_seq,
4030                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4031                                 goto out;
4032 cont:
4033                         idx++;
4034                 }
4035         }
4036 out:
4037         rcu_read_unlock();
4038         cb->args[1] = idx;
4039         cb->args[0] = h;
4040
4041         return skb->len;
4042 }
4043
4044 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4045 {
4046         struct sk_buff *skb;
4047         struct net *net = dev_net(idev->dev);
4048         int err = -ENOBUFS;
4049
4050         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4051         if (skb == NULL)
4052                 goto errout;
4053
4054         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4055         if (err < 0) {
4056                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4057                 WARN_ON(err == -EMSGSIZE);
4058                 kfree_skb(skb);
4059                 goto errout;
4060         }
4061         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4062         return;
4063 errout:
4064         if (err < 0)
4065                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4066 }
4067
4068 static inline size_t inet6_prefix_nlmsg_size(void)
4069 {
4070         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4071                + nla_total_size(sizeof(struct in6_addr))
4072                + nla_total_size(sizeof(struct prefix_cacheinfo));
4073 }
4074
4075 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4076                              struct prefix_info *pinfo, u32 pid, u32 seq,
4077                              int event, unsigned int flags)
4078 {
4079         struct prefixmsg *pmsg;
4080         struct nlmsghdr *nlh;
4081         struct prefix_cacheinfo ci;
4082
4083         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4084         if (nlh == NULL)
4085                 return -EMSGSIZE;
4086
4087         pmsg = nlmsg_data(nlh);
4088         pmsg->prefix_family = AF_INET6;
4089         pmsg->prefix_pad1 = 0;
4090         pmsg->prefix_pad2 = 0;
4091         pmsg->prefix_ifindex = idev->dev->ifindex;
4092         pmsg->prefix_len = pinfo->prefix_len;
4093         pmsg->prefix_type = pinfo->type;
4094         pmsg->prefix_pad3 = 0;
4095         pmsg->prefix_flags = 0;
4096         if (pinfo->onlink)
4097                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4098         if (pinfo->autoconf)
4099                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4100
4101         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4102
4103         ci.preferred_time = ntohl(pinfo->prefered);
4104         ci.valid_time = ntohl(pinfo->valid);
4105         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4106
4107         return nlmsg_end(skb, nlh);
4108
4109 nla_put_failure:
4110         nlmsg_cancel(skb, nlh);
4111         return -EMSGSIZE;
4112 }
4113
4114 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4115                          struct prefix_info *pinfo)
4116 {
4117         struct sk_buff *skb;
4118         struct net *net = dev_net(idev->dev);
4119         int err = -ENOBUFS;
4120
4121         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4122         if (skb == NULL)
4123                 goto errout;
4124
4125         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4126         if (err < 0) {
4127                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4128                 WARN_ON(err == -EMSGSIZE);
4129                 kfree_skb(skb);
4130                 goto errout;
4131         }
4132         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4133         return;
4134 errout:
4135         if (err < 0)
4136                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4137 }
4138
4139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4140 {
4141         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4142
4143         switch (event) {
4144         case RTM_NEWADDR:
4145                 /*
4146                  * If the address was optimistic
4147                  * we inserted the route at the start of
4148                  * our DAD process, so we don't need
4149                  * to do it again
4150                  */
4151                 if (!(ifp->rt->rt6i_node))
4152                         ip6_ins_rt(ifp->rt);
4153                 if (ifp->idev->cnf.forwarding)
4154                         addrconf_join_anycast(ifp);
4155                 break;
4156         case RTM_DELADDR:
4157                 if (ifp->idev->cnf.forwarding)
4158                         addrconf_leave_anycast(ifp);
4159                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4160                 dst_hold(&ifp->rt->dst);
4161
4162                 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4163                     ip6_del_rt(ifp->rt))
4164                         dst_free(&ifp->rt->dst);
4165                 break;
4166         }
4167 }
4168
4169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4170 {
4171         rcu_read_lock_bh();
4172         if (likely(ifp->idev->dead == 0))
4173                 __ipv6_ifa_notify(event, ifp);
4174         rcu_read_unlock_bh();
4175 }
4176
4177 #ifdef CONFIG_SYSCTL
4178
4179 static
4180 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4181                            void __user *buffer, size_t *lenp, loff_t *ppos)
4182 {
4183         int *valp = ctl->data;
4184         int val = *valp;
4185         loff_t pos = *ppos;
4186         int ret;
4187
4188         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4189
4190         if (write)
4191                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4192         if (ret)
4193                 *ppos = pos;
4194         return ret;
4195 }
4196
4197 static void dev_disable_change(struct inet6_dev *idev)
4198 {
4199         if (!idev || !idev->dev)
4200                 return;
4201
4202         if (idev->cnf.disable_ipv6)
4203                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4204         else
4205                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4206 }
4207
4208 static void addrconf_disable_change(struct net *net, __s32 newf)
4209 {
4210         struct net_device *dev;
4211         struct inet6_dev *idev;
4212
4213         rcu_read_lock();
4214         for_each_netdev_rcu(net, dev) {
4215                 idev = __in6_dev_get(dev);
4216                 if (idev) {
4217                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4218                         idev->cnf.disable_ipv6 = newf;
4219                         if (changed)
4220                                 dev_disable_change(idev);
4221                 }
4222         }
4223         rcu_read_unlock();
4224 }
4225
4226 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4227 {
4228         struct net *net;
4229
4230         net = (struct net *)table->extra2;
4231
4232         if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4233                 return 0;
4234
4235         if (!rtnl_trylock()) {
4236                 /* Restore the original values before restarting */
4237                 *p = old;
4238                 return restart_syscall();
4239         }
4240
4241         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4242                 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4243                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4244                 addrconf_disable_change(net, newf);
4245         } else if ((!*p) ^ (!old))
4246                 dev_disable_change((struct inet6_dev *)table->extra1);
4247
4248         rtnl_unlock();
4249         return 0;
4250 }
4251
4252 static
4253 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4254                             void __user *buffer, size_t *lenp, loff_t *ppos)
4255 {
4256         int *valp = ctl->data;
4257         int val = *valp;
4258         loff_t pos = *ppos;
4259         int ret;
4260
4261         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4262
4263         if (write)
4264                 ret = addrconf_disable_ipv6(ctl, valp, val);
4265         if (ret)
4266                 *ppos = pos;
4267         return ret;
4268 }
4269
4270 static struct addrconf_sysctl_table
4271 {
4272         struct ctl_table_header *sysctl_header;
4273         ctl_table addrconf_vars[DEVCONF_MAX+1];
4274         char *dev_name;
4275 } addrconf_sysctl __read_mostly = {
4276         .sysctl_header = NULL,
4277         .addrconf_vars = {
4278                 {
4279                         .procname       = "forwarding",
4280                         .data           = &ipv6_devconf.forwarding,
4281                         .maxlen         = sizeof(int),
4282                         .mode           = 0644,
4283                         .proc_handler   = addrconf_sysctl_forward,
4284                 },
4285                 {
4286                         .procname       = "hop_limit",
4287                         .data           = &ipv6_devconf.hop_limit,
4288                         .maxlen         = sizeof(int),
4289                         .mode           = 0644,
4290                         .proc_handler   = proc_dointvec,
4291                 },
4292                 {
4293                         .procname       = "mtu",
4294                         .data           = &ipv6_devconf.mtu6,
4295                         .maxlen         = sizeof(int),
4296                         .mode           = 0644,
4297                         .proc_handler   = proc_dointvec,
4298                 },
4299                 {
4300                         .procname       = "accept_ra",
4301                         .data           = &ipv6_devconf.accept_ra,
4302                         .maxlen         = sizeof(int),
4303                         .mode           = 0644,
4304                         .proc_handler   = proc_dointvec,
4305                 },
4306                 {
4307                         .procname       = "accept_redirects",
4308                         .data           = &ipv6_devconf.accept_redirects,
4309                         .maxlen         = sizeof(int),
4310                         .mode           = 0644,
4311                         .proc_handler   = proc_dointvec,
4312                 },
4313                 {
4314                         .procname       = "autoconf",
4315                         .data           = &ipv6_devconf.autoconf,
4316                         .maxlen         = sizeof(int),
4317                         .mode           = 0644,
4318                         .proc_handler   = proc_dointvec,
4319                 },
4320                 {
4321                         .procname       = "dad_transmits",
4322                         .data           = &ipv6_devconf.dad_transmits,
4323                         .maxlen         = sizeof(int),
4324                         .mode           = 0644,
4325                         .proc_handler   = proc_dointvec,
4326                 },
4327                 {
4328                         .procname       = "router_solicitations",
4329                         .data           = &ipv6_devconf.rtr_solicits,
4330                         .maxlen         = sizeof(int),
4331                         .mode           = 0644,
4332                         .proc_handler   = proc_dointvec,
4333                 },
4334                 {
4335                         .procname       = "router_solicitation_interval",
4336                         .data           = &ipv6_devconf.rtr_solicit_interval,
4337                         .maxlen         = sizeof(int),
4338                         .mode           = 0644,
4339                         .proc_handler   = proc_dointvec_jiffies,
4340                 },
4341                 {
4342                         .procname       = "router_solicitation_delay",
4343                         .data           = &ipv6_devconf.rtr_solicit_delay,
4344                         .maxlen         = sizeof(int),
4345                         .mode           = 0644,
4346                         .proc_handler   = proc_dointvec_jiffies,
4347                 },
4348                 {
4349                         .procname       = "force_mld_version",
4350                         .data           = &ipv6_devconf.force_mld_version,
4351                         .maxlen         = sizeof(int),
4352                         .mode           = 0644,
4353                         .proc_handler   = proc_dointvec,
4354                 },
4355 #ifdef CONFIG_IPV6_PRIVACY
4356                 {
4357                         .procname       = "use_tempaddr",
4358                         .data           = &ipv6_devconf.use_tempaddr,
4359                         .maxlen         = sizeof(int),
4360                         .mode           = 0644,
4361                         .proc_handler   = proc_dointvec,
4362                 },
4363                 {
4364                         .procname       = "temp_valid_lft",
4365                         .data           = &ipv6_devconf.temp_valid_lft,
4366                         .maxlen         = sizeof(int),
4367                         .mode           = 0644,
4368                         .proc_handler   = proc_dointvec,
4369                 },
4370                 {
4371                         .procname       = "temp_prefered_lft",
4372                         .data           = &ipv6_devconf.temp_prefered_lft,
4373                         .maxlen         = sizeof(int),
4374                         .mode           = 0644,
4375                         .proc_handler   = proc_dointvec,
4376                 },
4377                 {
4378                         .procname       = "regen_max_retry",
4379                         .data           = &ipv6_devconf.regen_max_retry,
4380                         .maxlen         = sizeof(int),
4381                         .mode           = 0644,
4382                         .proc_handler   = proc_dointvec,
4383                 },
4384                 {
4385                         .procname       = "max_desync_factor",
4386                         .data           = &ipv6_devconf.max_desync_factor,
4387                         .maxlen         = sizeof(int),
4388                         .mode           = 0644,
4389                         .proc_handler   = proc_dointvec,
4390                 },
4391 #endif
4392                 {
4393                         .procname       = "max_addresses",
4394                         .data           = &ipv6_devconf.max_addresses,
4395                         .maxlen         = sizeof(int),
4396                         .mode           = 0644,
4397                         .proc_handler   = proc_dointvec,
4398                 },
4399                 {
4400                         .procname       = "accept_ra_defrtr",
4401                         .data           = &ipv6_devconf.accept_ra_defrtr,
4402                         .maxlen         = sizeof(int),
4403                         .mode           = 0644,
4404                         .proc_handler   = proc_dointvec,
4405                 },
4406                 {
4407                         .procname       = "accept_ra_pinfo",
4408                         .data           = &ipv6_devconf.accept_ra_pinfo,
4409                         .maxlen         = sizeof(int),
4410                         .mode           = 0644,
4411                         .proc_handler   = proc_dointvec,
4412                 },
4413 #ifdef CONFIG_IPV6_ROUTER_PREF
4414                 {
4415                         .procname       = "accept_ra_rtr_pref",
4416                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4417                         .maxlen         = sizeof(int),
4418                         .mode           = 0644,
4419                         .proc_handler   = proc_dointvec,
4420                 },
4421                 {
4422                         .procname       = "router_probe_interval",
4423                         .data           = &ipv6_devconf.rtr_probe_interval,
4424                         .maxlen         = sizeof(int),
4425                         .mode           = 0644,
4426                         .proc_handler   = proc_dointvec_jiffies,
4427                 },
4428 #ifdef CONFIG_IPV6_ROUTE_INFO
4429                 {
4430                         .procname       = "accept_ra_rt_info_max_plen",
4431                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4432                         .maxlen         = sizeof(int),
4433                         .mode           = 0644,
4434                         .proc_handler   = proc_dointvec,
4435                 },
4436 #endif
4437 #endif
4438                 {
4439                         .procname       = "proxy_ndp",
4440                         .data           = &ipv6_devconf.proxy_ndp,
4441                         .maxlen         = sizeof(int),
4442                         .mode           = 0644,
4443                         .proc_handler   = proc_dointvec,
4444                 },
4445                 {
4446                         .procname       = "accept_source_route",
4447                         .data           = &ipv6_devconf.accept_source_route,
4448                         .maxlen         = sizeof(int),
4449                         .mode           = 0644,
4450                         .proc_handler   = proc_dointvec,
4451                 },
4452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4453                 {
4454                         .procname       = "optimistic_dad",
4455                         .data           = &ipv6_devconf.optimistic_dad,
4456                         .maxlen         = sizeof(int),
4457                         .mode           = 0644,
4458                         .proc_handler   = proc_dointvec,
4459
4460                 },
4461 #endif
4462 #ifdef CONFIG_IPV6_MROUTE
4463                 {
4464                         .procname       = "mc_forwarding",
4465                         .data           = &ipv6_devconf.mc_forwarding,
4466                         .maxlen         = sizeof(int),
4467                         .mode           = 0444,
4468                         .proc_handler   = proc_dointvec,
4469                 },
4470 #endif
4471                 {
4472                         .procname       = "disable_ipv6",
4473                         .data           = &ipv6_devconf.disable_ipv6,
4474                         .maxlen         = sizeof(int),
4475                         .mode           = 0644,
4476                         .proc_handler   = addrconf_sysctl_disable,
4477                 },
4478                 {
4479                         .procname       = "accept_dad",
4480                         .data           = &ipv6_devconf.accept_dad,
4481                         .maxlen         = sizeof(int),
4482                         .mode           = 0644,
4483                         .proc_handler   = proc_dointvec,
4484                 },
4485                 {
4486                         .procname       = "force_tllao",
4487                         .data           = &ipv6_devconf.force_tllao,
4488                         .maxlen         = sizeof(int),
4489                         .mode           = 0644,
4490                         .proc_handler   = proc_dointvec
4491                 },
4492                 {
4493                         /* sentinel */
4494                 }
4495         },
4496 };
4497
4498 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4499                 struct inet6_dev *idev, struct ipv6_devconf *p)
4500 {
4501         int i;
4502         struct addrconf_sysctl_table *t;
4503
4504 #define ADDRCONF_CTL_PATH_DEV   3
4505
4506         struct ctl_path addrconf_ctl_path[] = {
4507                 { .procname = "net", },
4508                 { .procname = "ipv6", },
4509                 { .procname = "conf", },
4510                 { /* to be set */ },
4511                 { },
4512         };
4513
4514
4515         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4516         if (t == NULL)
4517                 goto out;
4518
4519         for (i = 0; t->addrconf_vars[i].data; i++) {
4520                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4521                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4522                 t->addrconf_vars[i].extra2 = net;
4523         }
4524
4525         /*
4526          * Make a copy of dev_name, because '.procname' is regarded as const
4527          * by sysctl and we wouldn't want anyone to change it under our feet
4528          * (see SIOCSIFNAME).
4529          */
4530         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4531         if (!t->dev_name)
4532                 goto free;
4533
4534         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4535
4536         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4537                         t->addrconf_vars);
4538         if (t->sysctl_header == NULL)
4539                 goto free_procname;
4540
4541         p->sysctl = t;
4542         return 0;
4543
4544 free_procname:
4545         kfree(t->dev_name);
4546 free:
4547         kfree(t);
4548 out:
4549         return -ENOBUFS;
4550 }
4551
4552 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4553 {
4554         struct addrconf_sysctl_table *t;
4555
4556         if (p->sysctl == NULL)
4557                 return;
4558
4559         t = p->sysctl;
4560         p->sysctl = NULL;
4561         unregister_sysctl_table(t->sysctl_header);
4562         kfree(t->dev_name);
4563         kfree(t);
4564 }
4565
4566 static void addrconf_sysctl_register(struct inet6_dev *idev)
4567 {
4568         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4569                               &ndisc_ifinfo_sysctl_change);
4570         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4571                                         idev, &idev->cnf);
4572 }
4573
4574 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4575 {
4576         __addrconf_sysctl_unregister(&idev->cnf);
4577         neigh_sysctl_unregister(idev->nd_parms);
4578 }
4579
4580
4581 #endif
4582
4583 static int __net_init addrconf_init_net(struct net *net)
4584 {
4585         int err;
4586         struct ipv6_devconf *all, *dflt;
4587
4588         err = -ENOMEM;
4589         all = &ipv6_devconf;
4590         dflt = &ipv6_devconf_dflt;
4591
4592         if (!net_eq(net, &init_net)) {
4593                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4594                 if (all == NULL)
4595                         goto err_alloc_all;
4596
4597                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4598                 if (dflt == NULL)
4599                         goto err_alloc_dflt;
4600         } else {
4601                 /* these will be inherited by all namespaces */
4602                 dflt->autoconf = ipv6_defaults.autoconf;
4603                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4604         }
4605
4606         net->ipv6.devconf_all = all;
4607         net->ipv6.devconf_dflt = dflt;
4608
4609 #ifdef CONFIG_SYSCTL
4610         err = __addrconf_sysctl_register(net, "all", NULL, all);
4611         if (err < 0)
4612                 goto err_reg_all;
4613
4614         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4615         if (err < 0)
4616                 goto err_reg_dflt;
4617 #endif
4618         return 0;
4619
4620 #ifdef CONFIG_SYSCTL
4621 err_reg_dflt:
4622         __addrconf_sysctl_unregister(all);
4623 err_reg_all:
4624         kfree(dflt);
4625 #endif
4626 err_alloc_dflt:
4627         kfree(all);
4628 err_alloc_all:
4629         return err;
4630 }
4631
4632 static void __net_exit addrconf_exit_net(struct net *net)
4633 {
4634 #ifdef CONFIG_SYSCTL
4635         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4636         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4637 #endif
4638         if (!net_eq(net, &init_net)) {
4639                 kfree(net->ipv6.devconf_dflt);
4640                 kfree(net->ipv6.devconf_all);
4641         }
4642 }
4643
4644 static struct pernet_operations addrconf_ops = {
4645         .init = addrconf_init_net,
4646         .exit = addrconf_exit_net,
4647 };
4648
4649 /*
4650  *      Device notifier
4651  */
4652
4653 int register_inet6addr_notifier(struct notifier_block *nb)
4654 {
4655         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4656 }
4657 EXPORT_SYMBOL(register_inet6addr_notifier);
4658
4659 int unregister_inet6addr_notifier(struct notifier_block *nb)
4660 {
4661         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4662 }
4663 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4664
4665 static struct rtnl_af_ops inet6_ops = {
4666         .family           = AF_INET6,
4667         .fill_link_af     = inet6_fill_link_af,
4668         .get_link_af_size = inet6_get_link_af_size,
4669 };
4670
4671 /*
4672  *      Init / cleanup code
4673  */
4674
4675 int __init addrconf_init(void)
4676 {
4677         int i, err;
4678
4679         err = ipv6_addr_label_init();
4680         if (err < 0) {
4681                 printk(KERN_CRIT "IPv6 Addrconf:"
4682                        " cannot initialize default policy table: %d.\n", err);
4683                 goto out;
4684         }
4685
4686         err = register_pernet_subsys(&addrconf_ops);
4687         if (err < 0)
4688                 goto out_addrlabel;
4689
4690         /* The addrconf netdev notifier requires that loopback_dev
4691          * has it's ipv6 private information allocated and setup
4692          * before it can bring up and give link-local addresses
4693          * to other devices which are up.
4694          *
4695          * Unfortunately, loopback_dev is not necessarily the first
4696          * entry in the global dev_base list of net devices.  In fact,
4697          * it is likely to be the very last entry on that list.
4698          * So this causes the notifier registry below to try and
4699          * give link-local addresses to all devices besides loopback_dev
4700          * first, then loopback_dev, which cases all the non-loopback_dev
4701          * devices to fail to get a link-local address.
4702          *
4703          * So, as a temporary fix, allocate the ipv6 structure for
4704          * loopback_dev first by hand.
4705          * Longer term, all of the dependencies ipv6 has upon the loopback
4706          * device and it being up should be removed.
4707          */
4708         rtnl_lock();
4709         if (!ipv6_add_dev(init_net.loopback_dev))
4710                 err = -ENOMEM;
4711         rtnl_unlock();
4712         if (err)
4713                 goto errlo;
4714
4715         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4716                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4717
4718         register_netdevice_notifier(&ipv6_dev_notf);
4719
4720         addrconf_verify(0);
4721
4722         err = rtnl_af_register(&inet6_ops);
4723         if (err < 0)
4724                 goto errout_af;
4725
4726         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4727         if (err < 0)
4728                 goto errout;
4729
4730         /* Only the first call to __rtnl_register can fail */
4731         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4732         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4733         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4734         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4735         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4736
4737         ipv6_addr_label_rtnl_register();
4738
4739         return 0;
4740 errout:
4741         rtnl_af_unregister(&inet6_ops);
4742 errout_af:
4743         unregister_netdevice_notifier(&ipv6_dev_notf);
4744 errlo:
4745         unregister_pernet_subsys(&addrconf_ops);
4746 out_addrlabel:
4747         ipv6_addr_label_cleanup();
4748 out:
4749         return err;
4750 }
4751
4752 void addrconf_cleanup(void)
4753 {
4754         struct net_device *dev;
4755         int i;
4756
4757         unregister_netdevice_notifier(&ipv6_dev_notf);
4758         unregister_pernet_subsys(&addrconf_ops);
4759         ipv6_addr_label_cleanup();
4760
4761         rtnl_lock();
4762
4763         __rtnl_af_unregister(&inet6_ops);
4764
4765         /* clean dev list */
4766         for_each_netdev(&init_net, dev) {
4767                 if (__in6_dev_get(dev) == NULL)
4768                         continue;
4769                 addrconf_ifdown(dev, 1);
4770         }
4771         addrconf_ifdown(init_net.loopback_dev, 2);
4772
4773         /*
4774          *      Check hash table.
4775          */
4776         spin_lock_bh(&addrconf_hash_lock);
4777         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4778                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4779         spin_unlock_bh(&addrconf_hash_lock);
4780
4781         del_timer(&addr_chk_timer);
4782         rtnl_unlock();
4783 }