net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #include <linux/errno.h>
  42 #include <linux/types.h>
  43 #include <linux/kernel.h>
  44 #include <linux/socket.h>
  45 #include <linux/sockios.h>
  46 #include <linux/net.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <linux/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90
  91 /* Set to 3 to get tracing... */
  92 #define ACONF_DEBUG 2
  93
  94 #if ACONF_DEBUG >= 3
  95 #define ADBG(x) printk x
  96 #else
  97 #define ADBG(x)
  98 #endif
  99
 100 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 101 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
 102
 103 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
 104 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
 105 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
 106
 107 #ifdef CONFIG_SYSCTL
 108 static void addrconf_sysctl_register(struct inet6_dev *idev);
 109 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 110 #else
 111 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 112 {
 113 }
 114
 115 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 116 {
 117 }
 118 #endif
 119
 120 #ifdef CONFIG_IPV6_PRIVACY
 121 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 122 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 123 static void ipv6_regen_rndid(unsigned long data);
 124 #endif
 125
 126 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 127 static int ipv6_count_addresses(struct inet6_dev *idev);
 128
 129 /*
 130  *      Configured unicast address hash table
 131  */
 132 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 133 static DEFINE_SPINLOCK(addrconf_hash_lock);
 134
 135 static void addrconf_verify(unsigned long);
 136
 137 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 138 static DEFINE_SPINLOCK(addrconf_verify_lock);
 139
 140 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 141 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 142
 143 static void addrconf_type_change(struct net_device *dev,
 144                                  unsigned long event);
 145 static int addrconf_ifdown(struct net_device *dev, int how);
 146
 147 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 148 static void addrconf_dad_timer(unsigned long data);
 149 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 150 static void addrconf_dad_run(struct inet6_dev *idev);
 151 static void addrconf_rs_timer(unsigned long data);
 152 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 153 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 154
 155 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 156                                 struct prefix_info *pinfo);
 157 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 158                                struct net_device *dev);
 159
 160 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 161
 162 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 163         .forwarding             = 0,
 164         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 165         .mtu6                   = IPV6_MIN_MTU,
 166         .accept_ra              = 1,
 167         .accept_redirects       = 1,
 168         .autoconf               = 1,
 169         .force_mld_version      = 0,
 170         .dad_transmits          = 1,
 171         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 172         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 173         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 174 #ifdef CONFIG_IPV6_PRIVACY
 175         .use_tempaddr           = 0,
 176         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 177         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 178         .regen_max_retry        = REGEN_MAX_RETRY,
 179         .max_desync_factor      = MAX_DESYNC_FACTOR,
 180 #endif
 181         .max_addresses          = IPV6_MAX_ADDRESSES,
 182         .accept_ra_defrtr       = 1,
 183         .accept_ra_pinfo        = 1,
 184 #ifdef CONFIG_IPV6_ROUTER_PREF
 185         .accept_ra_rtr_pref     = 1,
 186         .rtr_probe_interval     = 60 * HZ,
 187 #ifdef CONFIG_IPV6_ROUTE_INFO
 188         .accept_ra_rt_info_max_plen = 0,
 189 #endif
 190 #endif
 191         .proxy_ndp              = 0,
 192         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 193         .disable_ipv6           = 0,
 194         .accept_dad             = 1,
 195 };
 196
 197 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 198         .forwarding             = 0,
 199         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 200         .mtu6                   = IPV6_MIN_MTU,
 201         .accept_ra              = 1,
 202         .accept_redirects       = 1,
 203         .autoconf               = 1,
 204         .dad_transmits          = 1,
 205         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 206         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 207         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 208 #ifdef CONFIG_IPV6_PRIVACY
 209         .use_tempaddr           = 0,
 210         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 211         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 212         .regen_max_retry        = REGEN_MAX_RETRY,
 213         .max_desync_factor      = MAX_DESYNC_FACTOR,
 214 #endif
 215         .max_addresses          = IPV6_MAX_ADDRESSES,
 216         .accept_ra_defrtr       = 1,
 217         .accept_ra_pinfo        = 1,
 218 #ifdef CONFIG_IPV6_ROUTER_PREF
 219         .accept_ra_rtr_pref     = 1,
 220         .rtr_probe_interval     = 60 * HZ,
 221 #ifdef CONFIG_IPV6_ROUTE_INFO
 222         .accept_ra_rt_info_max_plen = 0,
 223 #endif
 224 #endif
 225         .proxy_ndp              = 0,
 226         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 227         .disable_ipv6           = 0,
 228         .accept_dad             = 1,
 229 };
 230
 231 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 232 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 233 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 234 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 235 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 236
 237 /* Check if a valid qdisc is available */
 238 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 239 {
 240         return !qdisc_tx_is_noop(dev);
 241 }
 242
 243 /* Check if a route is valid prefix route */
 244 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 245 {
 246         return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
 247 }
 248
 249 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 250 {
 251         if (del_timer(&ifp->timer))
 252                 __in6_ifa_put(ifp);
 253 }
 254
 255 enum addrconf_timer_t {
 256         AC_NONE,
 257         AC_DAD,
 258         AC_RS,
 259 };
 260
 261 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 262                                enum addrconf_timer_t what,
 263                                unsigned long when)
 264 {
 265         if (!del_timer(&ifp->timer))
 266                 in6_ifa_hold(ifp);
 267
 268         switch (what) {
 269         case AC_DAD:
 270                 ifp->timer.function = addrconf_dad_timer;
 271                 break;
 272         case AC_RS:
 273                 ifp->timer.function = addrconf_rs_timer;
 274                 break;
 275         default:
 276                 break;
 277         }
 278         ifp->timer.expires = jiffies + when;
 279         add_timer(&ifp->timer);
 280 }
 281
 282 static int snmp6_alloc_dev(struct inet6_dev *idev)
 283 {
 284         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 285                           sizeof(struct ipstats_mib),
 286                           __alignof__(struct ipstats_mib)) < 0)
 287                 goto err_ip;
 288         if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
 289                           sizeof(struct icmpv6_mib),
 290                           __alignof__(struct icmpv6_mib)) < 0)
 291                 goto err_icmp;
 292         if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
 293                           sizeof(struct icmpv6msg_mib),
 294                           __alignof__(struct icmpv6msg_mib)) < 0)
 295                 goto err_icmpmsg;
 296
 297         return 0;
 298
 299 err_icmpmsg:
 300         snmp_mib_free((void __percpu **)idev->stats.icmpv6);
 301 err_icmp:
 302         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 303 err_ip:
 304         return -ENOMEM;
 305 }
 306
 307 static void snmp6_free_dev(struct inet6_dev *idev)
 308 {
 309         snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
 310         snmp_mib_free((void __percpu **)idev->stats.icmpv6);
 311         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 312 }
 313
 314 /* Nobody refers to this device, we may destroy it. */
 315
 316 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 317 {
 318         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 319         kfree(idev);
 320 }
 321
 322 void in6_dev_finish_destroy(struct inet6_dev *idev)
 323 {
 324         struct net_device *dev = idev->dev;
 325
 326         WARN_ON(!list_empty(&idev->addr_list));
 327         WARN_ON(idev->mc_list != NULL);
 328
 329 #ifdef NET_REFCNT_DEBUG
 330         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 331 #endif
 332         dev_put(dev);
 333         if (!idev->dead) {
 334                 pr_warning("Freeing alive inet6 device %p\n", idev);
 335                 return;
 336         }
 337         snmp6_free_dev(idev);
 338         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 339 }
 340
 341 EXPORT_SYMBOL(in6_dev_finish_destroy);
 342
 343 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 344 {
 345         struct inet6_dev *ndev;
 346
 347         ASSERT_RTNL();
 348
 349         if (dev->mtu < IPV6_MIN_MTU)
 350                 return NULL;
 351
 352         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 353
 354         if (ndev == NULL)
 355                 return NULL;
 356
 357         rwlock_init(&ndev->lock);
 358         ndev->dev = dev;
 359         INIT_LIST_HEAD(&ndev->addr_list);
 360
 361         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 362         ndev->cnf.mtu6 = dev->mtu;
 363         ndev->cnf.sysctl = NULL;
 364         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 365         if (ndev->nd_parms == NULL) {
 366                 kfree(ndev);
 367                 return NULL;
 368         }
 369         if (ndev->cnf.forwarding)
 370                 dev_disable_lro(dev);
 371         /* We refer to the device */
 372         dev_hold(dev);
 373
 374         if (snmp6_alloc_dev(ndev) < 0) {
 375                 ADBG((KERN_WARNING
 376                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 377                         __func__, dev->name));
 378                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 379                 ndev->dead = 1;
 380                 in6_dev_finish_destroy(ndev);
 381                 return NULL;
 382         }
 383
 384         if (snmp6_register_dev(ndev) < 0) {
 385                 ADBG((KERN_WARNING
 386                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 387                         __func__, dev->name));
 388                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 389                 ndev->dead = 1;
 390                 in6_dev_finish_destroy(ndev);
 391                 return NULL;
 392         }
 393
 394         /* One reference from device.  We must do this before
 395          * we invoke __ipv6_regen_rndid().
 396          */
 397         in6_dev_hold(ndev);
 398
 399         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 400                 ndev->cnf.accept_dad = -1;
 401
 402 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 403         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 404                 printk(KERN_INFO
 405                        "%s: Disabled Multicast RS\n",
 406                        dev->name);
 407                 ndev->cnf.rtr_solicits = 0;
 408         }
 409 #endif
 410
 411 #ifdef CONFIG_IPV6_PRIVACY
 412         INIT_LIST_HEAD(&ndev->tempaddr_list);
 413         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 414         if ((dev->flags&IFF_LOOPBACK) ||
 415             dev->type == ARPHRD_TUNNEL ||
 416             dev->type == ARPHRD_TUNNEL6 ||
 417             dev->type == ARPHRD_SIT ||
 418             dev->type == ARPHRD_NONE) {
 419                 printk(KERN_INFO
 420                        "%s: Disabled Privacy Extensions\n",
 421                        dev->name);
 422                 ndev->cnf.use_tempaddr = -1;
 423         } else {
 424                 in6_dev_hold(ndev);
 425                 ipv6_regen_rndid((unsigned long) ndev);
 426         }
 427 #endif
 428
 429         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 430                 ndev->if_flags |= IF_READY;
 431
 432         ipv6_mc_init_dev(ndev);
 433         ndev->tstamp = jiffies;
 434         addrconf_sysctl_register(ndev);
 435         /* protected by rtnl_lock */
 436         rcu_assign_pointer(dev->ip6_ptr, ndev);
 437
 438         /* Join all-node multicast group */
 439         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 440
 441         return ndev;
 442 }
 443
 444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 445 {
 446         struct inet6_dev *idev;
 447
 448         ASSERT_RTNL();
 449
 450         idev = __in6_dev_get(dev);
 451         if (!idev) {
 452                 idev = ipv6_add_dev(dev);
 453                 if (!idev)
 454                         return NULL;
 455         }
 456
 457         if (dev->flags&IFF_UP)
 458                 ipv6_mc_up(idev);
 459         return idev;
 460 }
 461
 462 #ifdef CONFIG_SYSCTL
 463 static void dev_forward_change(struct inet6_dev *idev)
 464 {
 465         struct net_device *dev;
 466         struct inet6_ifaddr *ifa;
 467
 468         if (!idev)
 469                 return;
 470         dev = idev->dev;
 471         if (idev->cnf.forwarding)
 472                 dev_disable_lro(dev);
 473         if (dev && (dev->flags & IFF_MULTICAST)) {
 474                 if (idev->cnf.forwarding)
 475                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 476                 else
 477                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 478         }
 479
 480         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 481                 if (ifa->flags&IFA_F_TENTATIVE)
 482                         continue;
 483                 if (idev->cnf.forwarding)
 484                         addrconf_join_anycast(ifa);
 485                 else
 486                         addrconf_leave_anycast(ifa);
 487         }
 488 }
 489
 490
 491 static void addrconf_forward_change(struct net *net, __s32 newf)
 492 {
 493         struct net_device *dev;
 494         struct inet6_dev *idev;
 495
 496         rcu_read_lock();
 497         for_each_netdev_rcu(net, dev) {
 498                 idev = __in6_dev_get(dev);
 499                 if (idev) {
 500                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 501                         idev->cnf.forwarding = newf;
 502                         if (changed)
 503                                 dev_forward_change(idev);
 504                 }
 505         }
 506         rcu_read_unlock();
 507 }
 508
 509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 510 {
 511         struct net *net;
 512
 513         net = (struct net *)table->extra2;
 514         if (p == &net->ipv6.devconf_dflt->forwarding)
 515                 return 0;
 516
 517         if (!rtnl_trylock()) {
 518                 /* Restore the original values before restarting */
 519                 *p = old;
 520                 return restart_syscall();
 521         }
 522
 523         if (p == &net->ipv6.devconf_all->forwarding) {
 524                 __s32 newf = net->ipv6.devconf_all->forwarding;
 525                 net->ipv6.devconf_dflt->forwarding = newf;
 526                 addrconf_forward_change(net, newf);
 527         } else if ((!*p) ^ (!old))
 528                 dev_forward_change((struct inet6_dev *)table->extra1);
 529         rtnl_unlock();
 530
 531         if (*p)
 532                 rt6_purge_dflt_routers(net);
 533         return 1;
 534 }
 535 #endif
 536
 537 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
 538 {
 539         struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
 540         kfree(ifp);
 541 }
 542
 543 /* Nobody refers to this ifaddr, destroy it */
 544 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 545 {
 546         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 547
 548 #ifdef NET_REFCNT_DEBUG
 549         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 550 #endif
 551
 552         in6_dev_put(ifp->idev);
 553
 554         if (del_timer(&ifp->timer))
 555                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 556
 557         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 558                 pr_warning("Freeing alive inet6 address %p\n", ifp);
 559                 return;
 560         }
 561         dst_release(&ifp->rt->dst);
 562
 563         call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
 564 }
 565
 566 static void
 567 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 568 {
 569         struct list_head *p;
 570         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 571
 572         /*
 573          * Each device address list is sorted in order of scope -
 574          * global before linklocal.
 575          */
 576         list_for_each(p, &idev->addr_list) {
 577                 struct inet6_ifaddr *ifa
 578                         = list_entry(p, struct inet6_ifaddr, if_list);
 579                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 580                         break;
 581         }
 582
 583         list_add_tail(&ifp->if_list, p);
 584 }
 585
 586 static u32 ipv6_addr_hash(const struct in6_addr *addr)
 587 {
 588         /*
 589          * We perform the hash function over the last 64 bits of the address
 590          * This will include the IEEE address token on links that support it.
 591          */
 592         return jhash_2words((__force u32)addr->s6_addr32[2],
 593                             (__force u32)addr->s6_addr32[3], 0)
 594                 & (IN6_ADDR_HSIZE - 1);
 595 }
 596
 597 /* On success it returns ifp with increased reference count */
 598
 599 static struct inet6_ifaddr *
 600 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 601               int scope, u32 flags)
 602 {
 603         struct inet6_ifaddr *ifa = NULL;
 604         struct rt6_info *rt;
 605         unsigned int hash;
 606         int err = 0;
 607         int addr_type = ipv6_addr_type(addr);
 608
 609         if (addr_type == IPV6_ADDR_ANY ||
 610             addr_type & IPV6_ADDR_MULTICAST ||
 611             (!(idev->dev->flags & IFF_LOOPBACK) &&
 612              addr_type & IPV6_ADDR_LOOPBACK))
 613                 return ERR_PTR(-EADDRNOTAVAIL);
 614
 615         rcu_read_lock_bh();
 616         if (idev->dead) {
 617                 err = -ENODEV;                  /*XXX*/
 618                 goto out2;
 619         }
 620
 621         if (idev->cnf.disable_ipv6) {
 622                 err = -EACCES;
 623                 goto out2;
 624         }
 625
 626         spin_lock(&addrconf_hash_lock);
 627
 628         /* Ignore adding duplicate addresses on an interface */
 629         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 630                 ADBG(("ipv6_add_addr: already assigned\n"));
 631                 err = -EEXIST;
 632                 goto out;
 633         }
 634
 635         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 636
 637         if (ifa == NULL) {
 638                 ADBG(("ipv6_add_addr: malloc failed\n"));
 639                 err = -ENOBUFS;
 640                 goto out;
 641         }
 642
 643         rt = addrconf_dst_alloc(idev, addr, 0);
 644         if (IS_ERR(rt)) {
 645                 err = PTR_ERR(rt);
 646                 goto out;
 647         }
 648
 649         ipv6_addr_copy(&ifa->addr, addr);
 650
 651         spin_lock_init(&ifa->lock);
 652         spin_lock_init(&ifa->state_lock);
 653         init_timer(&ifa->timer);
 654         INIT_HLIST_NODE(&ifa->addr_lst);
 655         ifa->timer.data = (unsigned long) ifa;
 656         ifa->scope = scope;
 657         ifa->prefix_len = pfxlen;
 658         ifa->flags = flags | IFA_F_TENTATIVE;
 659         ifa->cstamp = ifa->tstamp = jiffies;
 660
 661         ifa->rt = rt;
 662
 663         /*
 664          * part one of RFC 4429, section 3.3
 665          * We should not configure an address as
 666          * optimistic if we do not yet know the link
 667          * layer address of our nexhop router
 668          */
 669
 670         if (rt->rt6i_nexthop == NULL)
 671                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 672
 673         ifa->idev = idev;
 674         in6_dev_hold(idev);
 675         /* For caller */
 676         in6_ifa_hold(ifa);
 677
 678         /* Add to big hash table */
 679         hash = ipv6_addr_hash(addr);
 680
 681         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 682         spin_unlock(&addrconf_hash_lock);
 683
 684         write_lock(&idev->lock);
 685         /* Add to inet6_dev unicast addr list. */
 686         ipv6_link_dev_addr(idev, ifa);
 687
 688 #ifdef CONFIG_IPV6_PRIVACY
 689         if (ifa->flags&IFA_F_TEMPORARY) {
 690                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 691                 in6_ifa_hold(ifa);
 692         }
 693 #endif
 694
 695         in6_ifa_hold(ifa);
 696         write_unlock(&idev->lock);
 697 out2:
 698         rcu_read_unlock_bh();
 699
 700         if (likely(err == 0))
 701                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 702         else {
 703                 kfree(ifa);
 704                 ifa = ERR_PTR(err);
 705         }
 706
 707         return ifa;
 708 out:
 709         spin_unlock(&addrconf_hash_lock);
 710         goto out2;
 711 }
 712
 713 /* This function wants to get referenced ifp and releases it before return */
 714
 715 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 716 {
 717         struct inet6_ifaddr *ifa, *ifn;
 718         struct inet6_dev *idev = ifp->idev;
 719         int state;
 720         int hash;
 721         int deleted = 0, onlink = 0;
 722         unsigned long expires = jiffies;
 723
 724         hash = ipv6_addr_hash(&ifp->addr);
 725
 726         spin_lock_bh(&ifp->state_lock);
 727         state = ifp->state;
 728         ifp->state = INET6_IFADDR_STATE_DEAD;
 729         spin_unlock_bh(&ifp->state_lock);
 730
 731         if (state == INET6_IFADDR_STATE_DEAD)
 732                 goto out;
 733
 734         spin_lock_bh(&addrconf_hash_lock);
 735         hlist_del_init_rcu(&ifp->addr_lst);
 736         spin_unlock_bh(&addrconf_hash_lock);
 737
 738         write_lock_bh(&idev->lock);
 739 #ifdef CONFIG_IPV6_PRIVACY
 740         if (ifp->flags&IFA_F_TEMPORARY) {
 741                 list_del(&ifp->tmp_list);
 742                 if (ifp->ifpub) {
 743                         in6_ifa_put(ifp->ifpub);
 744                         ifp->ifpub = NULL;
 745                 }
 746                 __in6_ifa_put(ifp);
 747         }
 748 #endif
 749
 750         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 751                 if (ifa == ifp) {
 752                         list_del_init(&ifp->if_list);
 753                         __in6_ifa_put(ifp);
 754
 755                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 756                                 break;
 757                         deleted = 1;
 758                         continue;
 759                 } else if (ifp->flags & IFA_F_PERMANENT) {
 760                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 761                                               ifp->prefix_len)) {
 762                                 if (ifa->flags & IFA_F_PERMANENT) {
 763                                         onlink = 1;
 764                                         if (deleted)
 765                                                 break;
 766                                 } else {
 767                                         unsigned long lifetime;
 768
 769                                         if (!onlink)
 770                                                 onlink = -1;
 771
 772                                         spin_lock(&ifa->lock);
 773
 774                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 775                                         /*
 776                                          * Note: Because this address is
 777                                          * not permanent, lifetime <
 778                                          * LONG_MAX / HZ here.
 779                                          */
 780                                         if (time_before(expires,
 781                                                         ifa->tstamp + lifetime * HZ))
 782                                                 expires = ifa->tstamp + lifetime * HZ;
 783                                         spin_unlock(&ifa->lock);
 784                                 }
 785                         }
 786                 }
 787         }
 788         write_unlock_bh(&idev->lock);
 789
 790         addrconf_del_timer(ifp);
 791
 792         ipv6_ifa_notify(RTM_DELADDR, ifp);
 793
 794         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 795
 796         /*
 797          * Purge or update corresponding prefix
 798          *
 799          * 1) we don't purge prefix here if address was not permanent.
 800          *    prefix is managed by its own lifetime.
 801          * 2) if there're no addresses, delete prefix.
 802          * 3) if there're still other permanent address(es),
 803          *    corresponding prefix is still permanent.
 804          * 4) otherwise, update prefix lifetime to the
 805          *    longest valid lifetime among the corresponding
 806          *    addresses on the device.
 807          *    Note: subsequent RA will update lifetime.
 808          *
 809          * --yoshfuji
 810          */
 811         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 812                 struct in6_addr prefix;
 813                 struct rt6_info *rt;
 814                 struct net *net = dev_net(ifp->idev->dev);
 815                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 816                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 817
 818                 if (rt && addrconf_is_prefix_route(rt)) {
 819                         if (onlink == 0) {
 820                                 ip6_del_rt(rt);
 821                                 rt = NULL;
 822                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 823                                 rt->rt6i_expires = expires;
 824                                 rt->rt6i_flags |= RTF_EXPIRES;
 825                         }
 826                 }
 827                 dst_release(&rt->dst);
 828         }
 829
 830 out:
 831         in6_ifa_put(ifp);
 832 }
 833
 834 #ifdef CONFIG_IPV6_PRIVACY
 835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 836 {
 837         struct inet6_dev *idev = ifp->idev;
 838         struct in6_addr addr, *tmpaddr;
 839         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
 840         unsigned long regen_advance;
 841         int tmp_plen;
 842         int ret = 0;
 843         int max_addresses;
 844         u32 addr_flags;
 845
 846         write_lock(&idev->lock);
 847         if (ift) {
 848                 spin_lock_bh(&ift->lock);
 849                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 850                 spin_unlock_bh(&ift->lock);
 851                 tmpaddr = &addr;
 852         } else {
 853                 tmpaddr = NULL;
 854         }
 855 retry:
 856         in6_dev_hold(idev);
 857         if (idev->cnf.use_tempaddr <= 0) {
 858                 write_unlock(&idev->lock);
 859                 printk(KERN_INFO
 860                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 861                 in6_dev_put(idev);
 862                 ret = -1;
 863                 goto out;
 864         }
 865         spin_lock_bh(&ifp->lock);
 866         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 867                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 868                 spin_unlock_bh(&ifp->lock);
 869                 write_unlock(&idev->lock);
 870                 printk(KERN_WARNING
 871                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 872                 in6_dev_put(idev);
 873                 ret = -1;
 874                 goto out;
 875         }
 876         in6_ifa_hold(ifp);
 877         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 878         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 879                 spin_unlock_bh(&ifp->lock);
 880                 write_unlock(&idev->lock);
 881                 printk(KERN_WARNING
 882                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 883                 in6_ifa_put(ifp);
 884                 in6_dev_put(idev);
 885                 ret = -1;
 886                 goto out;
 887         }
 888         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 889         age = (jiffies - ifp->tstamp) / HZ;
 890         tmp_valid_lft = min_t(__u32,
 891                               ifp->valid_lft,
 892                               idev->cnf.temp_valid_lft + age);
 893         tmp_prefered_lft = min_t(__u32,
 894                                  ifp->prefered_lft,
 895                                  idev->cnf.temp_prefered_lft + age -
 896                                  idev->cnf.max_desync_factor);
 897         tmp_plen = ifp->prefix_len;
 898         max_addresses = idev->cnf.max_addresses;
 899         tmp_cstamp = ifp->cstamp;
 900         tmp_tstamp = ifp->tstamp;
 901         spin_unlock_bh(&ifp->lock);
 902
 903         regen_advance = idev->cnf.regen_max_retry *
 904                         idev->cnf.dad_transmits *
 905                         idev->nd_parms->retrans_time / HZ;
 906         write_unlock(&idev->lock);
 907
 908         /* A temporary address is created only if this calculated Preferred
 909          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 910          * an implementation must not create a temporary address with a zero
 911          * Preferred Lifetime.
 912          */
 913         if (tmp_prefered_lft <= regen_advance) {
 914                 in6_ifa_put(ifp);
 915                 in6_dev_put(idev);
 916                 ret = -1;
 917                 goto out;
 918         }
 919
 920         addr_flags = IFA_F_TEMPORARY;
 921         /* set in addrconf_prefix_rcv() */
 922         if (ifp->flags & IFA_F_OPTIMISTIC)
 923                 addr_flags |= IFA_F_OPTIMISTIC;
 924
 925         ift = !max_addresses ||
 926               ipv6_count_addresses(idev) < max_addresses ?
 927                 ipv6_add_addr(idev, &addr, tmp_plen,
 928                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 929                               addr_flags) : NULL;
 930         if (!ift || IS_ERR(ift)) {
 931                 in6_ifa_put(ifp);
 932                 in6_dev_put(idev);
 933                 printk(KERN_INFO
 934                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 935                 tmpaddr = &addr;
 936                 write_lock(&idev->lock);
 937                 goto retry;
 938         }
 939
 940         spin_lock_bh(&ift->lock);
 941         ift->ifpub = ifp;
 942         ift->valid_lft = tmp_valid_lft;
 943         ift->prefered_lft = tmp_prefered_lft;
 944         ift->cstamp = tmp_cstamp;
 945         ift->tstamp = tmp_tstamp;
 946         spin_unlock_bh(&ift->lock);
 947
 948         addrconf_dad_start(ift, 0);
 949         in6_ifa_put(ift);
 950         in6_dev_put(idev);
 951 out:
 952         return ret;
 953 }
 954 #endif
 955
 956 /*
 957  *      Choose an appropriate source address (RFC3484)
 958  */
 959 enum {
 960         IPV6_SADDR_RULE_INIT = 0,
 961         IPV6_SADDR_RULE_LOCAL,
 962         IPV6_SADDR_RULE_SCOPE,
 963         IPV6_SADDR_RULE_PREFERRED,
 964 #ifdef CONFIG_IPV6_MIP6
 965         IPV6_SADDR_RULE_HOA,
 966 #endif
 967         IPV6_SADDR_RULE_OIF,
 968         IPV6_SADDR_RULE_LABEL,
 969 #ifdef CONFIG_IPV6_PRIVACY
 970         IPV6_SADDR_RULE_PRIVACY,
 971 #endif
 972         IPV6_SADDR_RULE_ORCHID,
 973         IPV6_SADDR_RULE_PREFIX,
 974         IPV6_SADDR_RULE_MAX
 975 };
 976
 977 struct ipv6_saddr_score {
 978         int                     rule;
 979         int                     addr_type;
 980         struct inet6_ifaddr     *ifa;
 981         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 982         int                     scopedist;
 983         int                     matchlen;
 984 };
 985
 986 struct ipv6_saddr_dst {
 987         const struct in6_addr *addr;
 988         int ifindex;
 989         int scope;
 990         int label;
 991         unsigned int prefs;
 992 };
 993
 994 static inline int ipv6_saddr_preferred(int type)
 995 {
 996         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
 997                 return 1;
 998         return 0;
 999 }
1000
1001 static int ipv6_get_saddr_eval(struct net *net,
1002                                struct ipv6_saddr_score *score,
1003                                struct ipv6_saddr_dst *dst,
1004                                int i)
1005 {
1006         int ret;
1007
1008         if (i <= score->rule) {
1009                 switch (i) {
1010                 case IPV6_SADDR_RULE_SCOPE:
1011                         ret = score->scopedist;
1012                         break;
1013                 case IPV6_SADDR_RULE_PREFIX:
1014                         ret = score->matchlen;
1015                         break;
1016                 default:
1017                         ret = !!test_bit(i, score->scorebits);
1018                 }
1019                 goto out;
1020         }
1021
1022         switch (i) {
1023         case IPV6_SADDR_RULE_INIT:
1024                 /* Rule 0: remember if hiscore is not ready yet */
1025                 ret = !!score->ifa;
1026                 break;
1027         case IPV6_SADDR_RULE_LOCAL:
1028                 /* Rule 1: Prefer same address */
1029                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1030                 break;
1031         case IPV6_SADDR_RULE_SCOPE:
1032                 /* Rule 2: Prefer appropriate scope
1033                  *
1034                  *      ret
1035                  *       ^
1036                  *    -1 |  d 15
1037                  *    ---+--+-+---> scope
1038                  *       |
1039                  *       |             d is scope of the destination.
1040                  *  B-d  |  \
1041                  *       |   \      <- smaller scope is better if
1042                  *  B-15 |    \        if scope is enough for destinaion.
1043                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1044                  * d-C-1 | /
1045                  *       |/         <- greater is better
1046                  *   -C  /             if scope is not enough for destination.
1047                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1048                  *
1049                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1050                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1051                  * Assume B = 0 and we get C > 29.
1052                  */
1053                 ret = __ipv6_addr_src_scope(score->addr_type);
1054                 if (ret >= dst->scope)
1055                         ret = -ret;
1056                 else
1057                         ret -= 128;     /* 30 is enough */
1058                 score->scopedist = ret;
1059                 break;
1060         case IPV6_SADDR_RULE_PREFERRED:
1061                 /* Rule 3: Avoid deprecated and optimistic addresses */
1062                 ret = ipv6_saddr_preferred(score->addr_type) ||
1063                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1064                 break;
1065 #ifdef CONFIG_IPV6_MIP6
1066         case IPV6_SADDR_RULE_HOA:
1067             {
1068                 /* Rule 4: Prefer home address */
1069                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1070                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1071                 break;
1072             }
1073 #endif
1074         case IPV6_SADDR_RULE_OIF:
1075                 /* Rule 5: Prefer outgoing interface */
1076                 ret = (!dst->ifindex ||
1077                        dst->ifindex == score->ifa->idev->dev->ifindex);
1078                 break;
1079         case IPV6_SADDR_RULE_LABEL:
1080                 /* Rule 6: Prefer matching label */
1081                 ret = ipv6_addr_label(net,
1082                                       &score->ifa->addr, score->addr_type,
1083                                       score->ifa->idev->dev->ifindex) == dst->label;
1084                 break;
1085 #ifdef CONFIG_IPV6_PRIVACY
1086         case IPV6_SADDR_RULE_PRIVACY:
1087             {
1088                 /* Rule 7: Prefer public address
1089                  * Note: prefer temprary address if use_tempaddr >= 2
1090                  */
1091                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1092                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1093                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1094                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1095                 break;
1096             }
1097 #endif
1098         case IPV6_SADDR_RULE_ORCHID:
1099                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1100                  *          non-ORCHID vs non-ORCHID
1101                  */
1102                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1103                         ipv6_addr_orchid(dst->addr));
1104                 break;
1105         case IPV6_SADDR_RULE_PREFIX:
1106                 /* Rule 8: Use longest matching prefix */
1107                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1108                                                        dst->addr);
1109                 break;
1110         default:
1111                 ret = 0;
1112         }
1113
1114         if (ret)
1115                 __set_bit(i, score->scorebits);
1116         score->rule = i;
1117 out:
1118         return ret;
1119 }
1120
1121 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1122                        const struct in6_addr *daddr, unsigned int prefs,
1123                        struct in6_addr *saddr)
1124 {
1125         struct ipv6_saddr_score scores[2],
1126                                 *score = &scores[0], *hiscore = &scores[1];
1127         struct ipv6_saddr_dst dst;
1128         struct net_device *dev;
1129         int dst_type;
1130
1131         dst_type = __ipv6_addr_type(daddr);
1132         dst.addr = daddr;
1133         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1134         dst.scope = __ipv6_addr_src_scope(dst_type);
1135         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1136         dst.prefs = prefs;
1137
1138         hiscore->rule = -1;
1139         hiscore->ifa = NULL;
1140
1141         rcu_read_lock();
1142
1143         for_each_netdev_rcu(net, dev) {
1144                 struct inet6_dev *idev;
1145
1146                 /* Candidate Source Address (section 4)
1147                  *  - multicast and link-local destination address,
1148                  *    the set of candidate source address MUST only
1149                  *    include addresses assigned to interfaces
1150                  *    belonging to the same link as the outgoing
1151                  *    interface.
1152                  * (- For site-local destination addresses, the
1153                  *    set of candidate source addresses MUST only
1154                  *    include addresses assigned to interfaces
1155                  *    belonging to the same site as the outgoing
1156                  *    interface.)
1157                  */
1158                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160                     dst.ifindex && dev->ifindex != dst.ifindex)
1161                         continue;
1162
1163                 idev = __in6_dev_get(dev);
1164                 if (!idev)
1165                         continue;
1166
1167                 read_lock_bh(&idev->lock);
1168                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1169                         int i;
1170
1171                         /*
1172                          * - Tentative Address (RFC2462 section 5.4)
1173                          *  - A tentative address is not considered
1174                          *    "assigned to an interface" in the traditional
1175                          *    sense, unless it is also flagged as optimistic.
1176                          * - Candidate Source Address (section 4)
1177                          *  - In any case, anycast addresses, multicast
1178                          *    addresses, and the unspecified address MUST
1179                          *    NOT be included in a candidate set.
1180                          */
1181                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1183                                 continue;
1184
1185                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186
1187                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1189                                 LIMIT_NETDEBUG(KERN_DEBUG
1190                                                "ADDRCONF: unspecified / multicast address "
1191                                                "assigned as unicast address on %s",
1192                                                dev->name);
1193                                 continue;
1194                         }
1195
1196                         score->rule = -1;
1197                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198
1199                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200                                 int minihiscore, miniscore;
1201
1202                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1204
1205                                 if (minihiscore > miniscore) {
1206                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1207                                             score->scopedist > 0) {
1208                                                 /*
1209                                                  * special case:
1210                                                  * each remaining entry
1211                                                  * has too small (not enough)
1212                                                  * scope, because ifa entries
1213                                                  * are sorted by their scope
1214                                                  * values.
1215                                                  */
1216                                                 goto try_nextdev;
1217                                         }
1218                                         break;
1219                                 } else if (minihiscore < miniscore) {
1220                                         if (hiscore->ifa)
1221                                                 in6_ifa_put(hiscore->ifa);
1222
1223                                         in6_ifa_hold(score->ifa);
1224
1225                                         swap(hiscore, score);
1226
1227                                         /* restore our iterator */
1228                                         score->ifa = hiscore->ifa;
1229
1230                                         break;
1231                                 }
1232                         }
1233                 }
1234 try_nextdev:
1235                 read_unlock_bh(&idev->lock);
1236         }
1237         rcu_read_unlock();
1238
1239         if (!hiscore->ifa)
1240                 return -EADDRNOTAVAIL;
1241
1242         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1243         in6_ifa_put(hiscore->ifa);
1244         return 0;
1245 }
1246 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1247
1248 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1249                     unsigned char banned_flags)
1250 {
1251         struct inet6_dev *idev;
1252         int err = -EADDRNOTAVAIL;
1253
1254         rcu_read_lock();
1255         idev = __in6_dev_get(dev);
1256         if (idev) {
1257                 struct inet6_ifaddr *ifp;
1258
1259                 read_lock_bh(&idev->lock);
1260                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1261                         if (ifp->scope == IFA_LINK &&
1262                             !(ifp->flags & banned_flags)) {
1263                                 ipv6_addr_copy(addr, &ifp->addr);
1264                                 err = 0;
1265                                 break;
1266                         }
1267                 }
1268                 read_unlock_bh(&idev->lock);
1269         }
1270         rcu_read_unlock();
1271         return err;
1272 }
1273
1274 static int ipv6_count_addresses(struct inet6_dev *idev)
1275 {
1276         int cnt = 0;
1277         struct inet6_ifaddr *ifp;
1278
1279         read_lock_bh(&idev->lock);
1280         list_for_each_entry(ifp, &idev->addr_list, if_list)
1281                 cnt++;
1282         read_unlock_bh(&idev->lock);
1283         return cnt;
1284 }
1285
1286 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1287                   struct net_device *dev, int strict)
1288 {
1289         struct inet6_ifaddr *ifp;
1290         struct hlist_node *node;
1291         unsigned int hash = ipv6_addr_hash(addr);
1292
1293         rcu_read_lock_bh();
1294         hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1295                 if (!net_eq(dev_net(ifp->idev->dev), net))
1296                         continue;
1297                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1298                     !(ifp->flags&IFA_F_TENTATIVE) &&
1299                     (dev == NULL || ifp->idev->dev == dev ||
1300                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1301                         rcu_read_unlock_bh();
1302                         return 1;
1303                 }
1304         }
1305
1306         rcu_read_unlock_bh();
1307         return 0;
1308 }
1309 EXPORT_SYMBOL(ipv6_chk_addr);
1310
1311 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1312                                struct net_device *dev)
1313 {
1314         unsigned int hash = ipv6_addr_hash(addr);
1315         struct inet6_ifaddr *ifp;
1316         struct hlist_node *node;
1317
1318         hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1319                 if (!net_eq(dev_net(ifp->idev->dev), net))
1320                         continue;
1321                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1322                         if (dev == NULL || ifp->idev->dev == dev)
1323                                 return true;
1324                 }
1325         }
1326         return false;
1327 }
1328
1329 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1330 {
1331         struct inet6_dev *idev;
1332         struct inet6_ifaddr *ifa;
1333         int     onlink;
1334
1335         onlink = 0;
1336         rcu_read_lock();
1337         idev = __in6_dev_get(dev);
1338         if (idev) {
1339                 read_lock_bh(&idev->lock);
1340                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1341                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1342                                                    ifa->prefix_len);
1343                         if (onlink)
1344                                 break;
1345                 }
1346                 read_unlock_bh(&idev->lock);
1347         }
1348         rcu_read_unlock();
1349         return onlink;
1350 }
1351
1352 EXPORT_SYMBOL(ipv6_chk_prefix);
1353
1354 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1355                                      struct net_device *dev, int strict)
1356 {
1357         struct inet6_ifaddr *ifp, *result = NULL;
1358         unsigned int hash = ipv6_addr_hash(addr);
1359         struct hlist_node *node;
1360
1361         rcu_read_lock_bh();
1362         hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1363                 if (!net_eq(dev_net(ifp->idev->dev), net))
1364                         continue;
1365                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1366                         if (dev == NULL || ifp->idev->dev == dev ||
1367                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1368                                 result = ifp;
1369                                 in6_ifa_hold(ifp);
1370                                 break;
1371                         }
1372                 }
1373         }
1374         rcu_read_unlock_bh();
1375
1376         return result;
1377 }
1378
1379 /* Gets referenced address, destroys ifaddr */
1380
1381 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1382 {
1383         if (ifp->flags&IFA_F_PERMANENT) {
1384                 spin_lock_bh(&ifp->lock);
1385                 addrconf_del_timer(ifp);
1386                 ifp->flags |= IFA_F_TENTATIVE;
1387                 if (dad_failed)
1388                         ifp->flags |= IFA_F_DADFAILED;
1389                 spin_unlock_bh(&ifp->lock);
1390                 if (dad_failed)
1391                         ipv6_ifa_notify(0, ifp);
1392                 in6_ifa_put(ifp);
1393 #ifdef CONFIG_IPV6_PRIVACY
1394         } else if (ifp->flags&IFA_F_TEMPORARY) {
1395                 struct inet6_ifaddr *ifpub;
1396                 spin_lock_bh(&ifp->lock);
1397                 ifpub = ifp->ifpub;
1398                 if (ifpub) {
1399                         in6_ifa_hold(ifpub);
1400                         spin_unlock_bh(&ifp->lock);
1401                         ipv6_create_tempaddr(ifpub, ifp);
1402                         in6_ifa_put(ifpub);
1403                 } else {
1404                         spin_unlock_bh(&ifp->lock);
1405                 }
1406                 ipv6_del_addr(ifp);
1407 #endif
1408         } else
1409                 ipv6_del_addr(ifp);
1410 }
1411
1412 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1413 {
1414         int err = -ENOENT;
1415
1416         spin_lock(&ifp->state_lock);
1417         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1418                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1419                 err = 0;
1420         }
1421         spin_unlock(&ifp->state_lock);
1422
1423         return err;
1424 }
1425
1426 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1427 {
1428         struct inet6_dev *idev = ifp->idev;
1429
1430         if (addrconf_dad_end(ifp)) {
1431                 in6_ifa_put(ifp);
1432                 return;
1433         }
1434
1435         if (net_ratelimit())
1436                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1437                         ifp->idev->dev->name, &ifp->addr);
1438
1439         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1440                 struct in6_addr addr;
1441
1442                 addr.s6_addr32[0] = htonl(0xfe800000);
1443                 addr.s6_addr32[1] = 0;
1444
1445                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1446                     ipv6_addr_equal(&ifp->addr, &addr)) {
1447                         /* DAD failed for link-local based on MAC address */
1448                         idev->cnf.disable_ipv6 = 1;
1449
1450                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1451                                 ifp->idev->dev->name);
1452                 }
1453         }
1454
1455         addrconf_dad_stop(ifp, 1);
1456 }
1457
1458 /* Join to solicited addr multicast group. */
1459
1460 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1461 {
1462         struct in6_addr maddr;
1463
1464         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1465                 return;
1466
1467         addrconf_addr_solict_mult(addr, &maddr);
1468         ipv6_dev_mc_inc(dev, &maddr);
1469 }
1470
1471 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1472 {
1473         struct in6_addr maddr;
1474
1475         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1476                 return;
1477
1478         addrconf_addr_solict_mult(addr, &maddr);
1479         __ipv6_dev_mc_dec(idev, &maddr);
1480 }
1481
1482 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1483 {
1484         struct in6_addr addr;
1485         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1486         if (ipv6_addr_any(&addr))
1487                 return;
1488         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1489 }
1490
1491 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1492 {
1493         struct in6_addr addr;
1494         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1495         if (ipv6_addr_any(&addr))
1496                 return;
1497         __ipv6_dev_ac_dec(ifp->idev, &addr);
1498 }
1499
1500 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1501 {
1502         if (dev->addr_len != ETH_ALEN)
1503                 return -1;
1504         memcpy(eui, dev->dev_addr, 3);
1505         memcpy(eui + 5, dev->dev_addr + 3, 3);
1506
1507         /*
1508          * The zSeries OSA network cards can be shared among various
1509          * OS instances, but the OSA cards have only one MAC address.
1510          * This leads to duplicate address conflicts in conjunction
1511          * with IPv6 if more than one instance uses the same card.
1512          *
1513          * The driver for these cards can deliver a unique 16-bit
1514          * identifier for each instance sharing the same card.  It is
1515          * placed instead of 0xFFFE in the interface identifier.  The
1516          * "u" bit of the interface identifier is not inverted in this
1517          * case.  Hence the resulting interface identifier has local
1518          * scope according to RFC2373.
1519          */
1520         if (dev->dev_id) {
1521                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1522                 eui[4] = dev->dev_id & 0xFF;
1523         } else {
1524                 eui[3] = 0xFF;
1525                 eui[4] = 0xFE;
1526                 eui[0] ^= 2;
1527         }
1528         return 0;
1529 }
1530
1531 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1532 {
1533         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1534         if (dev->addr_len != ARCNET_ALEN)
1535                 return -1;
1536         memset(eui, 0, 7);
1537         eui[7] = *(u8*)dev->dev_addr;
1538         return 0;
1539 }
1540
1541 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1542 {
1543         if (dev->addr_len != INFINIBAND_ALEN)
1544                 return -1;
1545         memcpy(eui, dev->dev_addr + 12, 8);
1546         eui[0] |= 2;
1547         return 0;
1548 }
1549
1550 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1551 {
1552         if (addr == 0)
1553                 return -1;
1554         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1555                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1556                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1557                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1558                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1559                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1560         eui[1] = 0;
1561         eui[2] = 0x5E;
1562         eui[3] = 0xFE;
1563         memcpy(eui + 4, &addr, 4);
1564         return 0;
1565 }
1566
1567 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1568 {
1569         if (dev->priv_flags & IFF_ISATAP)
1570                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1571         return -1;
1572 }
1573
1574 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1575 {
1576         switch (dev->type) {
1577         case ARPHRD_ETHER:
1578         case ARPHRD_FDDI:
1579         case ARPHRD_IEEE802_TR:
1580                 return addrconf_ifid_eui48(eui, dev);
1581         case ARPHRD_ARCNET:
1582                 return addrconf_ifid_arcnet(eui, dev);
1583         case ARPHRD_INFINIBAND:
1584                 return addrconf_ifid_infiniband(eui, dev);
1585         case ARPHRD_SIT:
1586                 return addrconf_ifid_sit(eui, dev);
1587         }
1588         return -1;
1589 }
1590
1591 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1592 {
1593         int err = -1;
1594         struct inet6_ifaddr *ifp;
1595
1596         read_lock_bh(&idev->lock);
1597         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1598                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1599                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1600                         err = 0;
1601                         break;
1602                 }
1603         }
1604         read_unlock_bh(&idev->lock);
1605         return err;
1606 }
1607
1608 #ifdef CONFIG_IPV6_PRIVACY
1609 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1610 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1611 {
1612 regen:
1613         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1614         idev->rndid[0] &= ~0x02;
1615
1616         /*
1617          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1618          * check if generated address is not inappropriate
1619          *
1620          *  - Reserved subnet anycast (RFC 2526)
1621          *      11111101 11....11 1xxxxxxx
1622          *  - ISATAP (RFC4214) 6.1
1623          *      00-00-5E-FE-xx-xx-xx-xx
1624          *  - value 0
1625          *  - XXX: already assigned to an address on the device
1626          */
1627         if (idev->rndid[0] == 0xfd &&
1628             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1629             (idev->rndid[7]&0x80))
1630                 goto regen;
1631         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1632                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1633                         goto regen;
1634                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1635                         goto regen;
1636         }
1637
1638         return 0;
1639 }
1640
1641 static void ipv6_regen_rndid(unsigned long data)
1642 {
1643         struct inet6_dev *idev = (struct inet6_dev *) data;
1644         unsigned long expires;
1645
1646         rcu_read_lock_bh();
1647         write_lock_bh(&idev->lock);
1648
1649         if (idev->dead)
1650                 goto out;
1651
1652         if (__ipv6_regen_rndid(idev) < 0)
1653                 goto out;
1654
1655         expires = jiffies +
1656                 idev->cnf.temp_prefered_lft * HZ -
1657                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1658                 idev->cnf.max_desync_factor * HZ;
1659         if (time_before(expires, jiffies)) {
1660                 printk(KERN_WARNING
1661                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1662                         idev->dev->name);
1663                 goto out;
1664         }
1665
1666         if (!mod_timer(&idev->regen_timer, expires))
1667                 in6_dev_hold(idev);
1668
1669 out:
1670         write_unlock_bh(&idev->lock);
1671         rcu_read_unlock_bh();
1672         in6_dev_put(idev);
1673 }
1674
1675 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1676         int ret = 0;
1677
1678         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1679                 ret = __ipv6_regen_rndid(idev);
1680         return ret;
1681 }
1682 #endif
1683
1684 /*
1685  *      Add prefix route.
1686  */
1687
1688 static void
1689 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1690                       unsigned long expires, u32 flags)
1691 {
1692         struct fib6_config cfg = {
1693                 .fc_table = RT6_TABLE_PREFIX,
1694                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1695                 .fc_ifindex = dev->ifindex,
1696                 .fc_expires = expires,
1697                 .fc_dst_len = plen,
1698                 .fc_flags = RTF_UP | flags,
1699                 .fc_nlinfo.nl_net = dev_net(dev),
1700                 .fc_protocol = RTPROT_KERNEL,
1701         };
1702
1703         ipv6_addr_copy(&cfg.fc_dst, pfx);
1704
1705         /* Prevent useless cloning on PtP SIT.
1706            This thing is done here expecting that the whole
1707            class of non-broadcast devices need not cloning.
1708          */
1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1710         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1711                 cfg.fc_flags |= RTF_NONEXTHOP;
1712 #endif
1713
1714         ip6_route_add(&cfg);
1715 }
1716
1717 /* Create "default" multicast route to the interface */
1718
1719 static void addrconf_add_mroute(struct net_device *dev)
1720 {
1721         struct fib6_config cfg = {
1722                 .fc_table = RT6_TABLE_LOCAL,
1723                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1724                 .fc_ifindex = dev->ifindex,
1725                 .fc_dst_len = 8,
1726                 .fc_flags = RTF_UP,
1727                 .fc_nlinfo.nl_net = dev_net(dev),
1728         };
1729
1730         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1731
1732         ip6_route_add(&cfg);
1733 }
1734
1735 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1736 static void sit_route_add(struct net_device *dev)
1737 {
1738         struct fib6_config cfg = {
1739                 .fc_table = RT6_TABLE_MAIN,
1740                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1741                 .fc_ifindex = dev->ifindex,
1742                 .fc_dst_len = 96,
1743                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1744                 .fc_nlinfo.nl_net = dev_net(dev),
1745         };
1746
1747         /* prefix length - 96 bits "::d.d.d.d" */
1748         ip6_route_add(&cfg);
1749 }
1750 #endif
1751
1752 static void addrconf_add_lroute(struct net_device *dev)
1753 {
1754         struct in6_addr addr;
1755
1756         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1757         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1758 }
1759
1760 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1761 {
1762         struct inet6_dev *idev;
1763
1764         ASSERT_RTNL();
1765
1766         idev = ipv6_find_idev(dev);
1767         if (!idev)
1768                 return ERR_PTR(-ENOBUFS);
1769
1770         if (idev->cnf.disable_ipv6)
1771                 return ERR_PTR(-EACCES);
1772
1773         /* Add default multicast route */
1774         addrconf_add_mroute(dev);
1775
1776         /* Add link local route */
1777         addrconf_add_lroute(dev);
1778         return idev;
1779 }
1780
1781 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1782 {
1783         struct prefix_info *pinfo;
1784         __u32 valid_lft;
1785         __u32 prefered_lft;
1786         int addr_type;
1787         struct inet6_dev *in6_dev;
1788         struct net *net = dev_net(dev);
1789
1790         pinfo = (struct prefix_info *) opt;
1791
1792         if (len < sizeof(struct prefix_info)) {
1793                 ADBG(("addrconf: prefix option too short\n"));
1794                 return;
1795         }
1796
1797         /*
1798          *      Validation checks ([ADDRCONF], page 19)
1799          */
1800
1801         addr_type = ipv6_addr_type(&pinfo->prefix);
1802
1803         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1804                 return;
1805
1806         valid_lft = ntohl(pinfo->valid);
1807         prefered_lft = ntohl(pinfo->prefered);
1808
1809         if (prefered_lft > valid_lft) {
1810                 if (net_ratelimit())
1811                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1812                 return;
1813         }
1814
1815         in6_dev = in6_dev_get(dev);
1816
1817         if (in6_dev == NULL) {
1818                 if (net_ratelimit())
1819                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1820                 return;
1821         }
1822
1823         /*
1824          *      Two things going on here:
1825          *      1) Add routes for on-link prefixes
1826          *      2) Configure prefixes with the auto flag set
1827          */
1828
1829         if (pinfo->onlink) {
1830                 struct rt6_info *rt;
1831                 unsigned long rt_expires;
1832
1833                 /* Avoid arithmetic overflow. Really, we could
1834                  * save rt_expires in seconds, likely valid_lft,
1835                  * but it would require division in fib gc, that it
1836                  * not good.
1837                  */
1838                 if (HZ > USER_HZ)
1839                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1840                 else
1841                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1842
1843                 if (addrconf_finite_timeout(rt_expires))
1844                         rt_expires *= HZ;
1845
1846                 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1847                                 dev->ifindex, 1);
1848
1849                 if (rt && addrconf_is_prefix_route(rt)) {
1850                         /* Autoconf prefix route */
1851                         if (valid_lft == 0) {
1852                                 ip6_del_rt(rt);
1853                                 rt = NULL;
1854                         } else if (addrconf_finite_timeout(rt_expires)) {
1855                                 /* not infinity */
1856                                 rt->rt6i_expires = jiffies + rt_expires;
1857                                 rt->rt6i_flags |= RTF_EXPIRES;
1858                         } else {
1859                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1860                                 rt->rt6i_expires = 0;
1861                         }
1862                 } else if (valid_lft) {
1863                         clock_t expires = 0;
1864                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1865                         if (addrconf_finite_timeout(rt_expires)) {
1866                                 /* not infinity */
1867                                 flags |= RTF_EXPIRES;
1868                                 expires = jiffies_to_clock_t(rt_expires);
1869                         }
1870                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1871                                               dev, expires, flags);
1872                 }
1873                 if (rt)
1874                         dst_release(&rt->dst);
1875         }
1876
1877         /* Try to figure out our local address for this prefix */
1878
1879         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1880                 struct inet6_ifaddr * ifp;
1881                 struct in6_addr addr;
1882                 int create = 0, update_lft = 0;
1883
1884                 if (pinfo->prefix_len == 64) {
1885                         memcpy(&addr, &pinfo->prefix, 8);
1886                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1887                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1888                                 in6_dev_put(in6_dev);
1889                                 return;
1890                         }
1891                         goto ok;
1892                 }
1893                 if (net_ratelimit())
1894                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1895                                pinfo->prefix_len);
1896                 in6_dev_put(in6_dev);
1897                 return;
1898
1899 ok:
1900
1901                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1902
1903                 if (ifp == NULL && valid_lft) {
1904                         int max_addresses = in6_dev->cnf.max_addresses;
1905                         u32 addr_flags = 0;
1906
1907 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1908                         if (in6_dev->cnf.optimistic_dad &&
1909                             !net->ipv6.devconf_all->forwarding)
1910                                 addr_flags = IFA_F_OPTIMISTIC;
1911 #endif
1912
1913                         /* Do not allow to create too much of autoconfigured
1914                          * addresses; this would be too easy way to crash kernel.
1915                          */
1916                         if (!max_addresses ||
1917                             ipv6_count_addresses(in6_dev) < max_addresses)
1918                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1919                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1920                                                     addr_flags);
1921
1922                         if (!ifp || IS_ERR(ifp)) {
1923                                 in6_dev_put(in6_dev);
1924                                 return;
1925                         }
1926
1927                         update_lft = create = 1;
1928                         ifp->cstamp = jiffies;
1929                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1930                 }
1931
1932                 if (ifp) {
1933                         int flags;
1934                         unsigned long now;
1935 #ifdef CONFIG_IPV6_PRIVACY
1936                         struct inet6_ifaddr *ift;
1937 #endif
1938                         u32 stored_lft;
1939
1940                         /* update lifetime (RFC2462 5.5.3 e) */
1941                         spin_lock(&ifp->lock);
1942                         now = jiffies;
1943                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1944                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1945                         else
1946                                 stored_lft = 0;
1947                         if (!update_lft && stored_lft) {
1948                                 if (valid_lft > MIN_VALID_LIFETIME ||
1949                                     valid_lft > stored_lft)
1950                                         update_lft = 1;
1951                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1952                                         /* valid_lft <= stored_lft is always true */
1953                                         /*
1954                                          * RFC 4862 Section 5.5.3e:
1955                                          * "Note that the preferred lifetime of
1956                                          *  the corresponding address is always
1957                                          *  reset to the Preferred Lifetime in
1958                                          *  the received Prefix Information
1959                                          *  option, regardless of whether the
1960                                          *  valid lifetime is also reset or
1961                                          *  ignored."
1962                                          *
1963                                          *  So if the preferred lifetime in
1964                                          *  this advertisement is different
1965                                          *  than what we have stored, but the
1966                                          *  valid lifetime is invalid, just
1967                                          *  reset prefered_lft.
1968                                          *
1969                                          *  We must set the valid lifetime
1970                                          *  to the stored lifetime since we'll
1971                                          *  be updating the timestamp below,
1972                                          *  else we'll set it back to the
1973                                          *  minumum.
1974                                          */
1975                                         if (prefered_lft != ifp->prefered_lft) {
1976                                                 valid_lft = stored_lft;
1977                                                 update_lft = 1;
1978                                         }
1979                                 } else {
1980                                         valid_lft = MIN_VALID_LIFETIME;
1981                                         if (valid_lft < prefered_lft)
1982                                                 prefered_lft = valid_lft;
1983                                         update_lft = 1;
1984                                 }
1985                         }
1986
1987                         if (update_lft) {
1988                                 ifp->valid_lft = valid_lft;
1989                                 ifp->prefered_lft = prefered_lft;
1990                                 ifp->tstamp = now;
1991                                 flags = ifp->flags;
1992                                 ifp->flags &= ~IFA_F_DEPRECATED;
1993                                 spin_unlock(&ifp->lock);
1994
1995                                 if (!(flags&IFA_F_TENTATIVE))
1996                                         ipv6_ifa_notify(0, ifp);
1997                         } else
1998                                 spin_unlock(&ifp->lock);
1999
2000 #ifdef CONFIG_IPV6_PRIVACY
2001                         read_lock_bh(&in6_dev->lock);
2002                         /* update all temporary addresses in the list */
2003                         list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2004                                 /*
2005                                  * When adjusting the lifetimes of an existing
2006                                  * temporary address, only lower the lifetimes.
2007                                  * Implementations must not increase the
2008                                  * lifetimes of an existing temporary address
2009                                  * when processing a Prefix Information Option.
2010                                  */
2011                                 if (ifp != ift->ifpub)
2012                                         continue;
2013
2014                                 spin_lock(&ift->lock);
2015                                 flags = ift->flags;
2016                                 if (ift->valid_lft > valid_lft &&
2017                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2018                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2019                                 if (ift->prefered_lft > prefered_lft &&
2020                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2021                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2022                                 spin_unlock(&ift->lock);
2023                                 if (!(flags&IFA_F_TENTATIVE))
2024                                         ipv6_ifa_notify(0, ift);
2025                         }
2026
2027                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2028                                 /*
2029                                  * When a new public address is created as described in [ADDRCONF],
2030                                  * also create a new temporary address. Also create a temporary
2031                                  * address if it's enabled but no temporary address currently exists.
2032                                  */
2033                                 read_unlock_bh(&in6_dev->lock);
2034                                 ipv6_create_tempaddr(ifp, NULL);
2035                         } else {
2036                                 read_unlock_bh(&in6_dev->lock);
2037                         }
2038 #endif
2039                         in6_ifa_put(ifp);
2040                         addrconf_verify(0);
2041                 }
2042         }
2043         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2044         in6_dev_put(in6_dev);
2045 }
2046
2047 /*
2048  *      Set destination address.
2049  *      Special case for SIT interfaces where we create a new "virtual"
2050  *      device.
2051  */
2052 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2053 {
2054         struct in6_ifreq ireq;
2055         struct net_device *dev;
2056         int err = -EINVAL;
2057
2058         rtnl_lock();
2059
2060         err = -EFAULT;
2061         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2062                 goto err_exit;
2063
2064         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2065
2066         err = -ENODEV;
2067         if (dev == NULL)
2068                 goto err_exit;
2069
2070 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2071         if (dev->type == ARPHRD_SIT) {
2072                 const struct net_device_ops *ops = dev->netdev_ops;
2073                 struct ifreq ifr;
2074                 struct ip_tunnel_parm p;
2075
2076                 err = -EADDRNOTAVAIL;
2077                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2078                         goto err_exit;
2079
2080                 memset(&p, 0, sizeof(p));
2081                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2082                 p.iph.saddr = 0;
2083                 p.iph.version = 4;
2084                 p.iph.ihl = 5;
2085                 p.iph.protocol = IPPROTO_IPV6;
2086                 p.iph.ttl = 64;
2087                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2088
2089                 if (ops->ndo_do_ioctl) {
2090                         mm_segment_t oldfs = get_fs();
2091
2092                         set_fs(KERNEL_DS);
2093                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2094                         set_fs(oldfs);
2095                 } else
2096                         err = -EOPNOTSUPP;
2097
2098                 if (err == 0) {
2099                         err = -ENOBUFS;
2100                         dev = __dev_get_by_name(net, p.name);
2101                         if (!dev)
2102                                 goto err_exit;
2103                         err = dev_open(dev);
2104                 }
2105         }
2106 #endif
2107
2108 err_exit:
2109         rtnl_unlock();
2110         return err;
2111 }
2112
2113 /*
2114  *      Manual configuration of address on an interface
2115  */
2116 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2117                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2118                           __u32 valid_lft)
2119 {
2120         struct inet6_ifaddr *ifp;
2121         struct inet6_dev *idev;
2122         struct net_device *dev;
2123         int scope;
2124         u32 flags;
2125         clock_t expires;
2126         unsigned long timeout;
2127
2128         ASSERT_RTNL();
2129
2130         if (plen > 128)
2131                 return -EINVAL;
2132
2133         /* check the lifetime */
2134         if (!valid_lft || prefered_lft > valid_lft)
2135                 return -EINVAL;
2136
2137         dev = __dev_get_by_index(net, ifindex);
2138         if (!dev)
2139                 return -ENODEV;
2140
2141         idev = addrconf_add_dev(dev);
2142         if (IS_ERR(idev))
2143                 return PTR_ERR(idev);
2144
2145         scope = ipv6_addr_scope(pfx);
2146
2147         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2148         if (addrconf_finite_timeout(timeout)) {
2149                 expires = jiffies_to_clock_t(timeout * HZ);
2150                 valid_lft = timeout;
2151                 flags = RTF_EXPIRES;
2152         } else {
2153                 expires = 0;
2154                 flags = 0;
2155                 ifa_flags |= IFA_F_PERMANENT;
2156         }
2157
2158         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2159         if (addrconf_finite_timeout(timeout)) {
2160                 if (timeout == 0)
2161                         ifa_flags |= IFA_F_DEPRECATED;
2162                 prefered_lft = timeout;
2163         }
2164
2165         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2166
2167         if (!IS_ERR(ifp)) {
2168                 spin_lock_bh(&ifp->lock);
2169                 ifp->valid_lft = valid_lft;
2170                 ifp->prefered_lft = prefered_lft;
2171                 ifp->tstamp = jiffies;
2172                 spin_unlock_bh(&ifp->lock);
2173
2174                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2175                                       expires, flags);
2176                 /*
2177                  * Note that section 3.1 of RFC 4429 indicates
2178                  * that the Optimistic flag should not be set for
2179                  * manually configured addresses
2180                  */
2181                 addrconf_dad_start(ifp, 0);
2182                 in6_ifa_put(ifp);
2183                 addrconf_verify(0);
2184                 return 0;
2185         }
2186
2187         return PTR_ERR(ifp);
2188 }
2189
2190 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2191                           unsigned int plen)
2192 {
2193         struct inet6_ifaddr *ifp;
2194         struct inet6_dev *idev;
2195         struct net_device *dev;
2196
2197         if (plen > 128)
2198                 return -EINVAL;
2199
2200         dev = __dev_get_by_index(net, ifindex);
2201         if (!dev)
2202                 return -ENODEV;
2203
2204         if ((idev = __in6_dev_get(dev)) == NULL)
2205                 return -ENXIO;
2206
2207         read_lock_bh(&idev->lock);
2208         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2209                 if (ifp->prefix_len == plen &&
2210                     ipv6_addr_equal(pfx, &ifp->addr)) {
2211                         in6_ifa_hold(ifp);
2212                         read_unlock_bh(&idev->lock);
2213
2214                         ipv6_del_addr(ifp);
2215
2216                         /* If the last address is deleted administratively,
2217                            disable IPv6 on this interface.
2218                          */
2219                         if (list_empty(&idev->addr_list))
2220                                 addrconf_ifdown(idev->dev, 1);
2221                         return 0;
2222                 }
2223         }
2224         read_unlock_bh(&idev->lock);
2225         return -EADDRNOTAVAIL;
2226 }
2227
2228
2229 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2230 {
2231         struct in6_ifreq ireq;
2232         int err;
2233
2234         if (!capable(CAP_NET_ADMIN))
2235                 return -EPERM;
2236
2237         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2238                 return -EFAULT;
2239
2240         rtnl_lock();
2241         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2242                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2243                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2244         rtnl_unlock();
2245         return err;
2246 }
2247
2248 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2249 {
2250         struct in6_ifreq ireq;
2251         int err;
2252
2253         if (!capable(CAP_NET_ADMIN))
2254                 return -EPERM;
2255
2256         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2257                 return -EFAULT;
2258
2259         rtnl_lock();
2260         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2261                              ireq.ifr6_prefixlen);
2262         rtnl_unlock();
2263         return err;
2264 }
2265
2266 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2267                      int plen, int scope)
2268 {
2269         struct inet6_ifaddr *ifp;
2270
2271         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2272         if (!IS_ERR(ifp)) {
2273                 spin_lock_bh(&ifp->lock);
2274                 ifp->flags &= ~IFA_F_TENTATIVE;
2275                 spin_unlock_bh(&ifp->lock);
2276                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2277                 in6_ifa_put(ifp);
2278         }
2279 }
2280
2281 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2282 static void sit_add_v4_addrs(struct inet6_dev *idev)
2283 {
2284         struct in6_addr addr;
2285         struct net_device *dev;
2286         struct net *net = dev_net(idev->dev);
2287         int scope;
2288
2289         ASSERT_RTNL();
2290
2291         memset(&addr, 0, sizeof(struct in6_addr));
2292         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2293
2294         if (idev->dev->flags&IFF_POINTOPOINT) {
2295                 addr.s6_addr32[0] = htonl(0xfe800000);
2296                 scope = IFA_LINK;
2297         } else {
2298                 scope = IPV6_ADDR_COMPATv4;
2299         }
2300
2301         if (addr.s6_addr32[3]) {
2302                 add_addr(idev, &addr, 128, scope);
2303                 return;
2304         }
2305
2306         for_each_netdev(net, dev) {
2307                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2308                 if (in_dev && (dev->flags & IFF_UP)) {
2309                         struct in_ifaddr * ifa;
2310
2311                         int flag = scope;
2312
2313                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2314                                 int plen;
2315
2316                                 addr.s6_addr32[3] = ifa->ifa_local;
2317
2318                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2319                                         continue;
2320                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2321                                         if (idev->dev->flags&IFF_POINTOPOINT)
2322                                                 continue;
2323                                         flag |= IFA_HOST;
2324                                 }
2325                                 if (idev->dev->flags&IFF_POINTOPOINT)
2326                                         plen = 64;
2327                                 else
2328                                         plen = 96;
2329
2330                                 add_addr(idev, &addr, plen, flag);
2331                         }
2332                 }
2333         }
2334 }
2335 #endif
2336
2337 static void init_loopback(struct net_device *dev)
2338 {
2339         struct inet6_dev  *idev;
2340
2341         /* ::1 */
2342
2343         ASSERT_RTNL();
2344
2345         if ((idev = ipv6_find_idev(dev)) == NULL) {
2346                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2347                 return;
2348         }
2349
2350         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2351 }
2352
2353 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2354 {
2355         struct inet6_ifaddr * ifp;
2356         u32 addr_flags = IFA_F_PERMANENT;
2357
2358 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2359         if (idev->cnf.optimistic_dad &&
2360             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2361                 addr_flags |= IFA_F_OPTIMISTIC;
2362 #endif
2363
2364
2365         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2366         if (!IS_ERR(ifp)) {
2367                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2368                 addrconf_dad_start(ifp, 0);
2369                 in6_ifa_put(ifp);
2370         }
2371 }
2372
2373 static void addrconf_dev_config(struct net_device *dev)
2374 {
2375         struct in6_addr addr;
2376         struct inet6_dev    * idev;
2377
2378         ASSERT_RTNL();
2379
2380         if ((dev->type != ARPHRD_ETHER) &&
2381             (dev->type != ARPHRD_FDDI) &&
2382             (dev->type != ARPHRD_IEEE802_TR) &&
2383             (dev->type != ARPHRD_ARCNET) &&
2384             (dev->type != ARPHRD_INFINIBAND)) {
2385                 /* Alas, we support only Ethernet autoconfiguration. */
2386                 return;
2387         }
2388
2389         idev = addrconf_add_dev(dev);
2390         if (IS_ERR(idev))
2391                 return;
2392
2393         memset(&addr, 0, sizeof(struct in6_addr));
2394         addr.s6_addr32[0] = htonl(0xFE800000);
2395
2396         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2397                 addrconf_add_linklocal(idev, &addr);
2398 }
2399
2400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2401 static void addrconf_sit_config(struct net_device *dev)
2402 {
2403         struct inet6_dev *idev;
2404
2405         ASSERT_RTNL();
2406
2407         /*
2408          * Configure the tunnel with one of our IPv4
2409          * addresses... we should configure all of
2410          * our v4 addrs in the tunnel
2411          */
2412
2413         if ((idev = ipv6_find_idev(dev)) == NULL) {
2414                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2415                 return;
2416         }
2417
2418         if (dev->priv_flags & IFF_ISATAP) {
2419                 struct in6_addr addr;
2420
2421                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2422                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2423                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2424                         addrconf_add_linklocal(idev, &addr);
2425                 return;
2426         }
2427
2428         sit_add_v4_addrs(idev);
2429
2430         if (dev->flags&IFF_POINTOPOINT) {
2431                 addrconf_add_mroute(dev);
2432                 addrconf_add_lroute(dev);
2433         } else
2434                 sit_route_add(dev);
2435 }
2436 #endif
2437
2438 static inline int
2439 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2440 {
2441         struct in6_addr lladdr;
2442
2443         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2444                 addrconf_add_linklocal(idev, &lladdr);
2445                 return 0;
2446         }
2447         return -1;
2448 }
2449
2450 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2451 {
2452         struct net_device *link_dev;
2453         struct net *net = dev_net(idev->dev);
2454
2455         /* first try to inherit the link-local address from the link device */
2456         if (idev->dev->iflink &&
2457             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2458                 if (!ipv6_inherit_linklocal(idev, link_dev))
2459                         return;
2460         }
2461         /* then try to inherit it from any device */
2462         for_each_netdev(net, link_dev) {
2463                 if (!ipv6_inherit_linklocal(idev, link_dev))
2464                         return;
2465         }
2466         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2467 }
2468
2469 /*
2470  * Autoconfigure tunnel with a link-local address so routing protocols,
2471  * DHCPv6, MLD etc. can be run over the virtual link
2472  */
2473
2474 static void addrconf_ip6_tnl_config(struct net_device *dev)
2475 {
2476         struct inet6_dev *idev;
2477
2478         ASSERT_RTNL();
2479
2480         idev = addrconf_add_dev(dev);
2481         if (IS_ERR(idev)) {
2482                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2483                 return;
2484         }
2485         ip6_tnl_add_linklocal(idev);
2486 }
2487
2488 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2489                            void * data)
2490 {
2491         struct net_device *dev = (struct net_device *) data;
2492         struct inet6_dev *idev = __in6_dev_get(dev);
2493         int run_pending = 0;
2494         int err;
2495
2496         switch (event) {
2497         case NETDEV_REGISTER:
2498                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2499                         idev = ipv6_add_dev(dev);
2500                         if (!idev)
2501                                 return notifier_from_errno(-ENOMEM);
2502                 }
2503                 break;
2504
2505         case NETDEV_UP:
2506         case NETDEV_CHANGE:
2507                 if (dev->flags & IFF_SLAVE)
2508                         break;
2509
2510                 if (event == NETDEV_UP) {
2511                         if (!addrconf_qdisc_ok(dev)) {
2512                                 /* device is not ready yet. */
2513                                 printk(KERN_INFO
2514                                         "ADDRCONF(NETDEV_UP): %s: "
2515                                         "link is not ready\n",
2516                                         dev->name);
2517                                 break;
2518                         }
2519
2520                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2521                                 idev = ipv6_add_dev(dev);
2522
2523                         if (idev) {
2524                                 idev->if_flags |= IF_READY;
2525                                 run_pending = 1;
2526                         }
2527                 } else {
2528                         if (!addrconf_qdisc_ok(dev)) {
2529                                 /* device is still not ready. */
2530                                 break;
2531                         }
2532
2533                         if (idev) {
2534                                 if (idev->if_flags & IF_READY)
2535                                         /* device is already configured. */
2536                                         break;
2537                                 idev->if_flags |= IF_READY;
2538                         }
2539
2540                         printk(KERN_INFO
2541                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2542                                         "link becomes ready\n",
2543                                         dev->name);
2544
2545                         run_pending = 1;
2546                 }
2547
2548                 switch (dev->type) {
2549 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2550                 case ARPHRD_SIT:
2551                         addrconf_sit_config(dev);
2552                         break;
2553 #endif
2554                 case ARPHRD_TUNNEL6:
2555                         addrconf_ip6_tnl_config(dev);
2556                         break;
2557                 case ARPHRD_LOOPBACK:
2558                         init_loopback(dev);
2559                         break;
2560
2561                 default:
2562                         addrconf_dev_config(dev);
2563                         break;
2564                 }
2565
2566                 if (idev) {
2567                         if (run_pending)
2568                                 addrconf_dad_run(idev);
2569
2570                         /*
2571                          * If the MTU changed during the interface down,
2572                          * when the interface up, the changed MTU must be
2573                          * reflected in the idev as well as routers.
2574                          */
2575                         if (idev->cnf.mtu6 != dev->mtu &&
2576                             dev->mtu >= IPV6_MIN_MTU) {
2577                                 rt6_mtu_change(dev, dev->mtu);
2578                                 idev->cnf.mtu6 = dev->mtu;
2579                         }
2580                         idev->tstamp = jiffies;
2581                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2582
2583                         /*
2584                          * If the changed mtu during down is lower than
2585                          * IPV6_MIN_MTU stop IPv6 on this interface.
2586                          */
2587                         if (dev->mtu < IPV6_MIN_MTU)
2588                                 addrconf_ifdown(dev, 1);
2589                 }
2590                 break;
2591
2592         case NETDEV_CHANGEMTU:
2593                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2594                         rt6_mtu_change(dev, dev->mtu);
2595                         idev->cnf.mtu6 = dev->mtu;
2596                         break;
2597                 }
2598
2599                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2600                         idev = ipv6_add_dev(dev);
2601                         if (idev)
2602                                 break;
2603                 }
2604
2605                 /*
2606                  * MTU falled under IPV6_MIN_MTU.
2607                  * Stop IPv6 on this interface.
2608                  */
2609
2610         case NETDEV_DOWN:
2611         case NETDEV_UNREGISTER:
2612                 /*
2613                  *      Remove all addresses from this interface.
2614                  */
2615                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2616                 break;
2617
2618         case NETDEV_CHANGENAME:
2619                 if (idev) {
2620                         snmp6_unregister_dev(idev);
2621                         addrconf_sysctl_unregister(idev);
2622                         addrconf_sysctl_register(idev);
2623                         err = snmp6_register_dev(idev);
2624                         if (err)
2625                                 return notifier_from_errno(err);
2626                 }
2627                 break;
2628
2629         case NETDEV_PRE_TYPE_CHANGE:
2630         case NETDEV_POST_TYPE_CHANGE:
2631                 addrconf_type_change(dev, event);
2632                 break;
2633         }
2634
2635         return NOTIFY_OK;
2636 }
2637
2638 /*
2639  *      addrconf module should be notified of a device going up
2640  */
2641 static struct notifier_block ipv6_dev_notf = {
2642         .notifier_call = addrconf_notify,
2643 };
2644
2645 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2646 {
2647         struct inet6_dev *idev;
2648         ASSERT_RTNL();
2649
2650         idev = __in6_dev_get(dev);
2651
2652         if (event == NETDEV_POST_TYPE_CHANGE)
2653                 ipv6_mc_remap(idev);
2654         else if (event == NETDEV_PRE_TYPE_CHANGE)
2655                 ipv6_mc_unmap(idev);
2656 }
2657
2658 static int addrconf_ifdown(struct net_device *dev, int how)
2659 {
2660         struct net *net = dev_net(dev);
2661         struct inet6_dev *idev;
2662         struct inet6_ifaddr *ifa;
2663         LIST_HEAD(keep_list);
2664         int state;
2665
2666         ASSERT_RTNL();
2667
2668         rt6_ifdown(net, dev);
2669         neigh_ifdown(&nd_tbl, dev);
2670
2671         idev = __in6_dev_get(dev);
2672         if (idev == NULL)
2673                 return -ENODEV;
2674
2675         /*
2676          * Step 1: remove reference to ipv6 device from parent device.
2677          *         Do not dev_put!
2678          */
2679         if (how) {
2680                 idev->dead = 1;
2681
2682                 /* protected by rtnl_lock */
2683                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2684
2685                 /* Step 1.5: remove snmp6 entry */
2686                 snmp6_unregister_dev(idev);
2687
2688         }
2689
2690         write_lock_bh(&idev->lock);
2691
2692         /* Step 2: clear flags for stateless addrconf */
2693         if (!how)
2694                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2695
2696 #ifdef CONFIG_IPV6_PRIVACY
2697         if (how && del_timer(&idev->regen_timer))
2698                 in6_dev_put(idev);
2699
2700         /* Step 3: clear tempaddr list */
2701         while (!list_empty(&idev->tempaddr_list)) {
2702                 ifa = list_first_entry(&idev->tempaddr_list,
2703                                        struct inet6_ifaddr, tmp_list);
2704                 list_del(&ifa->tmp_list);
2705                 write_unlock_bh(&idev->lock);
2706                 spin_lock_bh(&ifa->lock);
2707
2708                 if (ifa->ifpub) {
2709                         in6_ifa_put(ifa->ifpub);
2710                         ifa->ifpub = NULL;
2711                 }
2712                 spin_unlock_bh(&ifa->lock);
2713                 in6_ifa_put(ifa);
2714                 write_lock_bh(&idev->lock);
2715         }
2716 #endif
2717
2718         while (!list_empty(&idev->addr_list)) {
2719                 ifa = list_first_entry(&idev->addr_list,
2720                                        struct inet6_ifaddr, if_list);
2721                 addrconf_del_timer(ifa);
2722
2723                 /* If just doing link down, and address is permanent
2724                    and not link-local, then retain it. */
2725                 if (!how &&
2726                     (ifa->flags&IFA_F_PERMANENT) &&
2727                     !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2728                         list_move_tail(&ifa->if_list, &keep_list);
2729
2730                         /* If not doing DAD on this address, just keep it. */
2731                         if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2732                             idev->cnf.accept_dad <= 0 ||
2733                             (ifa->flags & IFA_F_NODAD))
2734                                 continue;
2735
2736                         /* If it was tentative already, no need to notify */
2737                         if (ifa->flags & IFA_F_TENTATIVE)
2738                                 continue;
2739
2740                         /* Flag it for later restoration when link comes up */
2741                         ifa->flags |= IFA_F_TENTATIVE;
2742                         ifa->state = INET6_IFADDR_STATE_DAD;
2743
2744                         write_unlock_bh(&idev->lock);
2745
2746                         in6_ifa_hold(ifa);
2747                 } else {
2748                         list_del(&ifa->if_list);
2749
2750                         /* clear hash table */
2751                         spin_lock_bh(&addrconf_hash_lock);
2752                         hlist_del_init_rcu(&ifa->addr_lst);
2753                         spin_unlock_bh(&addrconf_hash_lock);
2754
2755                         write_unlock_bh(&idev->lock);
2756                         spin_lock_bh(&ifa->state_lock);
2757                         state = ifa->state;
2758                         ifa->state = INET6_IFADDR_STATE_DEAD;
2759                         spin_unlock_bh(&ifa->state_lock);
2760
2761                         if (state == INET6_IFADDR_STATE_DEAD)
2762                                 goto put_ifa;
2763                 }
2764
2765                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2766                 if (ifa->state == INET6_IFADDR_STATE_DEAD)
2767                         atomic_notifier_call_chain(&inet6addr_chain,
2768                                                    NETDEV_DOWN, ifa);
2769
2770 put_ifa:
2771                 in6_ifa_put(ifa);
2772
2773                 write_lock_bh(&idev->lock);
2774         }
2775
2776         list_splice(&keep_list, &idev->addr_list);
2777
2778         write_unlock_bh(&idev->lock);
2779
2780         /* Step 5: Discard multicast list */
2781         if (how)
2782                 ipv6_mc_destroy_dev(idev);
2783         else
2784                 ipv6_mc_down(idev);
2785
2786         idev->tstamp = jiffies;
2787
2788         /* Last: Shot the device (if unregistered) */
2789         if (how) {
2790                 addrconf_sysctl_unregister(idev);
2791                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2792                 neigh_ifdown(&nd_tbl, dev);
2793                 in6_dev_put(idev);
2794         }
2795         return 0;
2796 }
2797
2798 static void addrconf_rs_timer(unsigned long data)
2799 {
2800         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2801         struct inet6_dev *idev = ifp->idev;
2802
2803         read_lock(&idev->lock);
2804         if (idev->dead || !(idev->if_flags & IF_READY))
2805                 goto out;
2806
2807         if (idev->cnf.forwarding)
2808                 goto out;
2809
2810         /* Announcement received after solicitation was sent */
2811         if (idev->if_flags & IF_RA_RCVD)
2812                 goto out;
2813
2814         spin_lock(&ifp->lock);
2815         if (ifp->probes++ < idev->cnf.rtr_solicits) {
2816                 /* The wait after the last probe can be shorter */
2817                 addrconf_mod_timer(ifp, AC_RS,
2818                                    (ifp->probes == idev->cnf.rtr_solicits) ?
2819                                    idev->cnf.rtr_solicit_delay :
2820                                    idev->cnf.rtr_solicit_interval);
2821                 spin_unlock(&ifp->lock);
2822
2823                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2824         } else {
2825                 spin_unlock(&ifp->lock);
2826                 /*
2827                  * Note: we do not support deprecated "all on-link"
2828                  * assumption any longer.
2829                  */
2830                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2831                        idev->dev->name);
2832         }
2833
2834 out:
2835         read_unlock(&idev->lock);
2836         in6_ifa_put(ifp);
2837 }
2838
2839 /*
2840  *      Duplicate Address Detection
2841  */
2842 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2843 {
2844         unsigned long rand_num;
2845         struct inet6_dev *idev = ifp->idev;
2846
2847         if (ifp->flags & IFA_F_OPTIMISTIC)
2848                 rand_num = 0;
2849         else
2850                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2851
2852         ifp->probes = idev->cnf.dad_transmits;
2853         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2854 }
2855
2856 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2857 {
2858         struct inet6_dev *idev = ifp->idev;
2859         struct net_device *dev = idev->dev;
2860
2861         addrconf_join_solict(dev, &ifp->addr);
2862
2863         net_srandom(ifp->addr.s6_addr32[3]);
2864
2865         read_lock_bh(&idev->lock);
2866         spin_lock(&ifp->lock);
2867         if (ifp->state == INET6_IFADDR_STATE_DEAD)
2868                 goto out;
2869
2870         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2871             idev->cnf.accept_dad < 1 ||
2872             !(ifp->flags&IFA_F_TENTATIVE) ||
2873             ifp->flags & IFA_F_NODAD) {
2874                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2875                 spin_unlock(&ifp->lock);
2876                 read_unlock_bh(&idev->lock);
2877
2878                 addrconf_dad_completed(ifp);
2879                 return;
2880         }
2881
2882         if (!(idev->if_flags & IF_READY)) {
2883                 spin_unlock(&ifp->lock);
2884                 read_unlock_bh(&idev->lock);
2885                 /*
2886                  * If the device is not ready:
2887                  * - keep it tentative if it is a permanent address.
2888                  * - otherwise, kill it.
2889                  */
2890                 in6_ifa_hold(ifp);
2891                 addrconf_dad_stop(ifp, 0);
2892                 return;
2893         }
2894
2895         /*
2896          * Optimistic nodes can start receiving
2897          * Frames right away
2898          */
2899         if (ifp->flags & IFA_F_OPTIMISTIC)
2900                 ip6_ins_rt(ifp->rt);
2901
2902         addrconf_dad_kick(ifp);
2903 out:
2904         spin_unlock(&ifp->lock);
2905         read_unlock_bh(&idev->lock);
2906 }
2907
2908 static void addrconf_dad_timer(unsigned long data)
2909 {
2910         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2911         struct inet6_dev *idev = ifp->idev;
2912         struct in6_addr mcaddr;
2913
2914         if (!ifp->probes && addrconf_dad_end(ifp))
2915                 goto out;
2916
2917         read_lock(&idev->lock);
2918         if (idev->dead || !(idev->if_flags & IF_READY)) {
2919                 read_unlock(&idev->lock);
2920                 goto out;
2921         }
2922
2923         spin_lock(&ifp->lock);
2924         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2925                 spin_unlock(&ifp->lock);
2926                 read_unlock(&idev->lock);
2927                 goto out;
2928         }
2929
2930         if (ifp->probes == 0) {
2931                 /*
2932                  * DAD was successful
2933                  */
2934
2935                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2936                 spin_unlock(&ifp->lock);
2937                 read_unlock(&idev->lock);
2938
2939                 addrconf_dad_completed(ifp);
2940
2941                 goto out;
2942         }
2943
2944         ifp->probes--;
2945         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2946         spin_unlock(&ifp->lock);
2947         read_unlock(&idev->lock);
2948
2949         /* send a neighbour solicitation for our addr */
2950         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2951         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2952 out:
2953         in6_ifa_put(ifp);
2954 }
2955
2956 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2957 {
2958         struct net_device *dev = ifp->idev->dev;
2959
2960         /*
2961          *      Configure the address for reception. Now it is valid.
2962          */
2963
2964         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2965
2966         /* If added prefix is link local and forwarding is off,
2967            start sending router solicitations.
2968          */
2969
2970         if ((ifp->idev->cnf.forwarding == 0 ||
2971              ifp->idev->cnf.forwarding == 2) &&
2972             ifp->idev->cnf.rtr_solicits > 0 &&
2973             (dev->flags&IFF_LOOPBACK) == 0 &&
2974             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2975                 /*
2976                  *      If a host as already performed a random delay
2977                  *      [...] as part of DAD [...] there is no need
2978                  *      to delay again before sending the first RS
2979                  */
2980                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2981
2982                 spin_lock_bh(&ifp->lock);
2983                 ifp->probes = 1;
2984                 ifp->idev->if_flags |= IF_RS_SENT;
2985                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2986                 spin_unlock_bh(&ifp->lock);
2987         }
2988 }
2989
2990 static void addrconf_dad_run(struct inet6_dev *idev)
2991 {
2992         struct inet6_ifaddr *ifp;
2993
2994         read_lock_bh(&idev->lock);
2995         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2996                 spin_lock(&ifp->lock);
2997                 if (ifp->flags & IFA_F_TENTATIVE &&
2998                     ifp->state == INET6_IFADDR_STATE_DAD)
2999                         addrconf_dad_kick(ifp);
3000                 spin_unlock(&ifp->lock);
3001         }
3002         read_unlock_bh(&idev->lock);
3003 }
3004
3005 #ifdef CONFIG_PROC_FS
3006 struct if6_iter_state {
3007         struct seq_net_private p;
3008         int bucket;
3009 };
3010
3011 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3012 {
3013         struct inet6_ifaddr *ifa = NULL;
3014         struct if6_iter_state *state = seq->private;
3015         struct net *net = seq_file_net(seq);
3016
3017         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3018                 struct hlist_node *n;
3019                 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3020                                          addr_lst)
3021                         if (net_eq(dev_net(ifa->idev->dev), net))
3022                                 return ifa;
3023         }
3024         return NULL;
3025 }
3026
3027 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3028                                          struct inet6_ifaddr *ifa)
3029 {
3030         struct if6_iter_state *state = seq->private;
3031         struct net *net = seq_file_net(seq);
3032         struct hlist_node *n = &ifa->addr_lst;
3033
3034         hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3035                 if (net_eq(dev_net(ifa->idev->dev), net))
3036                         return ifa;
3037
3038         while (++state->bucket < IN6_ADDR_HSIZE) {
3039                 hlist_for_each_entry_rcu_bh(ifa, n,
3040                                      &inet6_addr_lst[state->bucket], addr_lst) {
3041                         if (net_eq(dev_net(ifa->idev->dev), net))
3042                                 return ifa;
3043                 }
3044         }
3045
3046         return NULL;
3047 }
3048
3049 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3050 {
3051         struct inet6_ifaddr *ifa = if6_get_first(seq);
3052
3053         if (ifa)
3054                 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3055                         --pos;
3056         return pos ? NULL : ifa;
3057 }
3058
3059 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3060         __acquires(rcu_bh)
3061 {
3062         rcu_read_lock_bh();
3063         return if6_get_idx(seq, *pos);
3064 }
3065
3066 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3067 {
3068         struct inet6_ifaddr *ifa;
3069
3070         ifa = if6_get_next(seq, v);
3071         ++*pos;
3072         return ifa;
3073 }
3074
3075 static void if6_seq_stop(struct seq_file *seq, void *v)
3076         __releases(rcu_bh)
3077 {
3078         rcu_read_unlock_bh();
3079 }
3080
3081 static int if6_seq_show(struct seq_file *seq, void *v)
3082 {
3083         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3084         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3085                    &ifp->addr,
3086                    ifp->idev->dev->ifindex,
3087                    ifp->prefix_len,
3088                    ifp->scope,
3089                    ifp->flags,
3090                    ifp->idev->dev->name);
3091         return 0;
3092 }
3093
3094 static const struct seq_operations if6_seq_ops = {
3095         .start  = if6_seq_start,
3096         .next   = if6_seq_next,
3097         .show   = if6_seq_show,
3098         .stop   = if6_seq_stop,
3099 };
3100
3101 static int if6_seq_open(struct inode *inode, struct file *file)
3102 {
3103         return seq_open_net(inode, file, &if6_seq_ops,
3104                             sizeof(struct if6_iter_state));
3105 }
3106
3107 static const struct file_operations if6_fops = {
3108         .owner          = THIS_MODULE,
3109         .open           = if6_seq_open,
3110         .read           = seq_read,
3111         .llseek         = seq_lseek,
3112         .release        = seq_release_net,
3113 };
3114
3115 static int __net_init if6_proc_net_init(struct net *net)
3116 {
3117         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3118                 return -ENOMEM;
3119         return 0;
3120 }
3121
3122 static void __net_exit if6_proc_net_exit(struct net *net)
3123 {
3124        proc_net_remove(net, "if_inet6");
3125 }
3126
3127 static struct pernet_operations if6_proc_net_ops = {
3128        .init = if6_proc_net_init,
3129        .exit = if6_proc_net_exit,
3130 };
3131
3132 int __init if6_proc_init(void)
3133 {
3134         return register_pernet_subsys(&if6_proc_net_ops);
3135 }
3136
3137 void if6_proc_exit(void)
3138 {
3139         unregister_pernet_subsys(&if6_proc_net_ops);
3140 }
3141 #endif  /* CONFIG_PROC_FS */
3142
3143 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3144 /* Check if address is a home address configured on any interface. */
3145 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3146 {
3147         int ret = 0;
3148         struct inet6_ifaddr *ifp = NULL;
3149         struct hlist_node *n;
3150         unsigned int hash = ipv6_addr_hash(addr);
3151
3152         rcu_read_lock_bh();
3153         hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3154                 if (!net_eq(dev_net(ifp->idev->dev), net))
3155                         continue;
3156                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3157                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3158                         ret = 1;
3159                         break;
3160                 }
3161         }
3162         rcu_read_unlock_bh();
3163         return ret;
3164 }
3165 #endif
3166
3167 /*
3168  *      Periodic address status verification
3169  */
3170
3171 static void addrconf_verify(unsigned long foo)
3172 {
3173         unsigned long now, next, next_sec, next_sched;
3174         struct inet6_ifaddr *ifp;
3175         struct hlist_node *node;
3176         int i;
3177
3178         rcu_read_lock_bh();
3179         spin_lock(&addrconf_verify_lock);
3180         now = jiffies;
3181         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3182
3183         del_timer(&addr_chk_timer);
3184
3185         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3186 restart:
3187                 hlist_for_each_entry_rcu_bh(ifp, node,
3188                                          &inet6_addr_lst[i], addr_lst) {
3189                         unsigned long age;
3190
3191                         if (ifp->flags & IFA_F_PERMANENT)
3192                                 continue;
3193
3194                         spin_lock(&ifp->lock);
3195                         /* We try to batch several events at once. */
3196                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3197
3198                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3199                             age >= ifp->valid_lft) {
3200                                 spin_unlock(&ifp->lock);
3201                                 in6_ifa_hold(ifp);
3202                                 ipv6_del_addr(ifp);
3203                                 goto restart;
3204                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3205                                 spin_unlock(&ifp->lock);
3206                                 continue;
3207                         } else if (age >= ifp->prefered_lft) {
3208                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3209                                 int deprecate = 0;
3210
3211                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3212                                         deprecate = 1;
3213                                         ifp->flags |= IFA_F_DEPRECATED;
3214                                 }
3215
3216                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3217                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3218
3219                                 spin_unlock(&ifp->lock);
3220
3221                                 if (deprecate) {
3222                                         in6_ifa_hold(ifp);
3223
3224                                         ipv6_ifa_notify(0, ifp);
3225                                         in6_ifa_put(ifp);
3226                                         goto restart;
3227                                 }
3228 #ifdef CONFIG_IPV6_PRIVACY
3229                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3230                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3231                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3232                                         ifp->idev->cnf.dad_transmits *
3233                                         ifp->idev->nd_parms->retrans_time / HZ;
3234
3235                                 if (age >= ifp->prefered_lft - regen_advance) {
3236                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3237                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3238                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3239                                         if (!ifp->regen_count && ifpub) {
3240                                                 ifp->regen_count++;
3241                                                 in6_ifa_hold(ifp);
3242                                                 in6_ifa_hold(ifpub);
3243                                                 spin_unlock(&ifp->lock);
3244
3245                                                 spin_lock(&ifpub->lock);
3246                                                 ifpub->regen_count = 0;
3247                                                 spin_unlock(&ifpub->lock);
3248                                                 ipv6_create_tempaddr(ifpub, ifp);
3249                                                 in6_ifa_put(ifpub);
3250                                                 in6_ifa_put(ifp);
3251                                                 goto restart;
3252                                         }
3253                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3254                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3255                                 spin_unlock(&ifp->lock);
3256 #endif
3257                         } else {
3258                                 /* ifp->prefered_lft <= ifp->valid_lft */
3259                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3260                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3261                                 spin_unlock(&ifp->lock);
3262                         }
3263                 }
3264         }
3265
3266         next_sec = round_jiffies_up(next);
3267         next_sched = next;
3268
3269         /* If rounded timeout is accurate enough, accept it. */
3270         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3271                 next_sched = next_sec;
3272
3273         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3274         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3275                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3276
3277         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3278               now, next, next_sec, next_sched));
3279
3280         addr_chk_timer.expires = next_sched;
3281         add_timer(&addr_chk_timer);
3282         spin_unlock(&addrconf_verify_lock);
3283         rcu_read_unlock_bh();
3284 }
3285
3286 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3287 {
3288         struct in6_addr *pfx = NULL;
3289
3290         if (addr)
3291                 pfx = nla_data(addr);
3292
3293         if (local) {
3294                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3295                         pfx = NULL;
3296                 else
3297                         pfx = nla_data(local);
3298         }
3299
3300         return pfx;
3301 }
3302
3303 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3304         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3305         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3306         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3307 };
3308
3309 static int
3310 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3311 {
3312         struct net *net = sock_net(skb->sk);
3313         struct ifaddrmsg *ifm;
3314         struct nlattr *tb[IFA_MAX+1];
3315         struct in6_addr *pfx;
3316         int err;
3317
3318         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3319         if (err < 0)
3320                 return err;
3321
3322         ifm = nlmsg_data(nlh);
3323         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3324         if (pfx == NULL)
3325                 return -EINVAL;
3326
3327         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3328 }
3329
3330 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3331                              u32 prefered_lft, u32 valid_lft)
3332 {
3333         u32 flags;
3334         clock_t expires;
3335         unsigned long timeout;
3336
3337         if (!valid_lft || (prefered_lft > valid_lft))
3338                 return -EINVAL;
3339
3340         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3341         if (addrconf_finite_timeout(timeout)) {
3342                 expires = jiffies_to_clock_t(timeout * HZ);
3343                 valid_lft = timeout;
3344                 flags = RTF_EXPIRES;
3345         } else {
3346                 expires = 0;
3347                 flags = 0;
3348                 ifa_flags |= IFA_F_PERMANENT;
3349         }
3350
3351         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3352         if (addrconf_finite_timeout(timeout)) {
3353                 if (timeout == 0)
3354                         ifa_flags |= IFA_F_DEPRECATED;
3355                 prefered_lft = timeout;
3356         }
3357
3358         spin_lock_bh(&ifp->lock);
3359         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3360         ifp->tstamp = jiffies;
3361         ifp->valid_lft = valid_lft;
3362         ifp->prefered_lft = prefered_lft;
3363
3364         spin_unlock_bh(&ifp->lock);
3365         if (!(ifp->flags&IFA_F_TENTATIVE))
3366                 ipv6_ifa_notify(0, ifp);
3367
3368         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3369                               expires, flags);
3370         addrconf_verify(0);
3371
3372         return 0;
3373 }
3374
3375 static int
3376 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3377 {
3378         struct net *net = sock_net(skb->sk);
3379         struct ifaddrmsg *ifm;
3380         struct nlattr *tb[IFA_MAX+1];
3381         struct in6_addr *pfx;
3382         struct inet6_ifaddr *ifa;
3383         struct net_device *dev;
3384         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3385         u8 ifa_flags;
3386         int err;
3387
3388         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3389         if (err < 0)
3390                 return err;
3391
3392         ifm = nlmsg_data(nlh);
3393         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3394         if (pfx == NULL)
3395                 return -EINVAL;
3396
3397         if (tb[IFA_CACHEINFO]) {
3398                 struct ifa_cacheinfo *ci;
3399
3400                 ci = nla_data(tb[IFA_CACHEINFO]);
3401                 valid_lft = ci->ifa_valid;
3402                 preferred_lft = ci->ifa_prefered;
3403         } else {
3404                 preferred_lft = INFINITY_LIFE_TIME;
3405                 valid_lft = INFINITY_LIFE_TIME;
3406         }
3407
3408         dev =  __dev_get_by_index(net, ifm->ifa_index);
3409         if (dev == NULL)
3410                 return -ENODEV;
3411
3412         /* We ignore other flags so far. */
3413         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3414
3415         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3416         if (ifa == NULL) {
3417                 /*
3418                  * It would be best to check for !NLM_F_CREATE here but
3419                  * userspace alreay relies on not having to provide this.
3420                  */
3421                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3422                                       ifm->ifa_prefixlen, ifa_flags,
3423                                       preferred_lft, valid_lft);
3424         }
3425
3426         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3427             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3428                 err = -EEXIST;
3429         else
3430                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3431
3432         in6_ifa_put(ifa);
3433
3434         return err;
3435 }
3436
3437 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3438                           u8 scope, int ifindex)
3439 {
3440         struct ifaddrmsg *ifm;
3441
3442         ifm = nlmsg_data(nlh);
3443         ifm->ifa_family = AF_INET6;
3444         ifm->ifa_prefixlen = prefixlen;
3445         ifm->ifa_flags = flags;
3446         ifm->ifa_scope = scope;
3447         ifm->ifa_index = ifindex;
3448 }
3449
3450 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3451                          unsigned long tstamp, u32 preferred, u32 valid)
3452 {
3453         struct ifa_cacheinfo ci;
3454
3455         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3456                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3457         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3458                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3459         ci.ifa_prefered = preferred;
3460         ci.ifa_valid = valid;
3461
3462         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3463 }
3464
3465 static inline int rt_scope(int ifa_scope)
3466 {
3467         if (ifa_scope & IFA_HOST)
3468                 return RT_SCOPE_HOST;
3469         else if (ifa_scope & IFA_LINK)
3470                 return RT_SCOPE_LINK;
3471         else if (ifa_scope & IFA_SITE)
3472                 return RT_SCOPE_SITE;
3473         else
3474                 return RT_SCOPE_UNIVERSE;
3475 }
3476
3477 static inline int inet6_ifaddr_msgsize(void)
3478 {
3479         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3480                + nla_total_size(16) /* IFA_ADDRESS */
3481                + nla_total_size(sizeof(struct ifa_cacheinfo));
3482 }
3483
3484 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3485                              u32 pid, u32 seq, int event, unsigned int flags)
3486 {
3487         struct nlmsghdr  *nlh;
3488         u32 preferred, valid;
3489
3490         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3491         if (nlh == NULL)
3492                 return -EMSGSIZE;
3493
3494         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3495                       ifa->idev->dev->ifindex);
3496
3497         if (!(ifa->flags&IFA_F_PERMANENT)) {
3498                 preferred = ifa->prefered_lft;
3499                 valid = ifa->valid_lft;
3500                 if (preferred != INFINITY_LIFE_TIME) {
3501                         long tval = (jiffies - ifa->tstamp)/HZ;
3502                         if (preferred > tval)
3503                                 preferred -= tval;
3504                         else
3505                                 preferred = 0;
3506                         if (valid != INFINITY_LIFE_TIME) {
3507                                 if (valid > tval)
3508                                         valid -= tval;
3509                                 else
3510                                         valid = 0;
3511                         }
3512                 }
3513         } else {
3514                 preferred = INFINITY_LIFE_TIME;
3515                 valid = INFINITY_LIFE_TIME;
3516         }
3517
3518         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3519             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3520                 nlmsg_cancel(skb, nlh);
3521                 return -EMSGSIZE;
3522         }
3523
3524         return nlmsg_end(skb, nlh);
3525 }
3526
3527 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3528                                 u32 pid, u32 seq, int event, u16 flags)
3529 {
3530         struct nlmsghdr  *nlh;
3531         u8 scope = RT_SCOPE_UNIVERSE;
3532         int ifindex = ifmca->idev->dev->ifindex;
3533
3534         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3535                 scope = RT_SCOPE_SITE;
3536
3537         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3538         if (nlh == NULL)
3539                 return -EMSGSIZE;
3540
3541         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3542         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3543             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3544                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3545                 nlmsg_cancel(skb, nlh);
3546                 return -EMSGSIZE;
3547         }
3548
3549         return nlmsg_end(skb, nlh);
3550 }
3551
3552 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3553                                 u32 pid, u32 seq, int event, unsigned int flags)
3554 {
3555         struct nlmsghdr  *nlh;
3556         u8 scope = RT_SCOPE_UNIVERSE;
3557         int ifindex = ifaca->aca_idev->dev->ifindex;
3558
3559         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3560                 scope = RT_SCOPE_SITE;
3561
3562         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3563         if (nlh == NULL)
3564                 return -EMSGSIZE;
3565
3566         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3567         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3568             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3569                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3570                 nlmsg_cancel(skb, nlh);
3571                 return -EMSGSIZE;
3572         }
3573
3574         return nlmsg_end(skb, nlh);
3575 }
3576
3577 enum addr_type_t {
3578         UNICAST_ADDR,
3579         MULTICAST_ADDR,
3580         ANYCAST_ADDR,
3581 };
3582
3583 /* called with rcu_read_lock() */
3584 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3585                           struct netlink_callback *cb, enum addr_type_t type,
3586                           int s_ip_idx, int *p_ip_idx)
3587 {
3588         struct ifmcaddr6 *ifmca;
3589         struct ifacaddr6 *ifaca;
3590         int err = 1;
3591         int ip_idx = *p_ip_idx;
3592
3593         read_lock_bh(&idev->lock);
3594         switch (type) {
3595         case UNICAST_ADDR: {
3596                 struct inet6_ifaddr *ifa;
3597
3598                 /* unicast address incl. temp addr */
3599                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3600                         if (++ip_idx < s_ip_idx)
3601                                 continue;
3602                         err = inet6_fill_ifaddr(skb, ifa,
3603                                                 NETLINK_CB(cb->skb).pid,
3604                                                 cb->nlh->nlmsg_seq,
3605                                                 RTM_NEWADDR,
3606                                                 NLM_F_MULTI);
3607                         if (err <= 0)
3608                                 break;
3609                 }
3610                 break;
3611         }
3612         case MULTICAST_ADDR:
3613                 /* multicast address */
3614                 for (ifmca = idev->mc_list; ifmca;
3615                      ifmca = ifmca->next, ip_idx++) {
3616                         if (ip_idx < s_ip_idx)
3617                                 continue;
3618                         err = inet6_fill_ifmcaddr(skb, ifmca,
3619                                                   NETLINK_CB(cb->skb).pid,
3620                                                   cb->nlh->nlmsg_seq,
3621                                                   RTM_GETMULTICAST,
3622                                                   NLM_F_MULTI);
3623                         if (err <= 0)
3624                                 break;
3625                 }
3626                 break;
3627         case ANYCAST_ADDR:
3628                 /* anycast address */
3629                 for (ifaca = idev->ac_list; ifaca;
3630                      ifaca = ifaca->aca_next, ip_idx++) {
3631                         if (ip_idx < s_ip_idx)
3632                                 continue;
3633                         err = inet6_fill_ifacaddr(skb, ifaca,
3634                                                   NETLINK_CB(cb->skb).pid,
3635                                                   cb->nlh->nlmsg_seq,
3636                                                   RTM_GETANYCAST,
3637                                                   NLM_F_MULTI);
3638                         if (err <= 0)
3639                                 break;
3640                 }
3641                 break;
3642         default:
3643                 break;
3644         }
3645         read_unlock_bh(&idev->lock);
3646         *p_ip_idx = ip_idx;
3647         return err;
3648 }
3649
3650 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3651                            enum addr_type_t type)
3652 {
3653         struct net *net = sock_net(skb->sk);
3654         int h, s_h;
3655         int idx, ip_idx;
3656         int s_idx, s_ip_idx;
3657         struct net_device *dev;
3658         struct inet6_dev *idev;
3659         struct hlist_head *head;
3660         struct hlist_node *node;
3661
3662         s_h = cb->args[0];
3663         s_idx = idx = cb->args[1];
3664         s_ip_idx = ip_idx = cb->args[2];
3665
3666         rcu_read_lock();
3667         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3668                 idx = 0;
3669                 head = &net->dev_index_head[h];
3670                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3671                         if (idx < s_idx)
3672                                 goto cont;
3673                         if (h > s_h || idx > s_idx)
3674                                 s_ip_idx = 0;
3675                         ip_idx = 0;
3676                         idev = __in6_dev_get(dev);
3677                         if (!idev)
3678                                 goto cont;
3679
3680                         if (in6_dump_addrs(idev, skb, cb, type,
3681                                            s_ip_idx, &ip_idx) <= 0)
3682                                 goto done;
3683 cont:
3684                         idx++;
3685                 }
3686         }
3687 done:
3688         rcu_read_unlock();
3689         cb->args[0] = h;
3690         cb->args[1] = idx;
3691         cb->args[2] = ip_idx;
3692
3693         return skb->len;
3694 }
3695
3696 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3697 {
3698         enum addr_type_t type = UNICAST_ADDR;
3699
3700         return inet6_dump_addr(skb, cb, type);
3701 }
3702
3703 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3704 {
3705         enum addr_type_t type = MULTICAST_ADDR;
3706
3707         return inet6_dump_addr(skb, cb, type);
3708 }
3709
3710
3711 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3712 {
3713         enum addr_type_t type = ANYCAST_ADDR;
3714
3715         return inet6_dump_addr(skb, cb, type);
3716 }
3717
3718 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3719                              void *arg)
3720 {
3721         struct net *net = sock_net(in_skb->sk);
3722         struct ifaddrmsg *ifm;
3723         struct nlattr *tb[IFA_MAX+1];
3724         struct in6_addr *addr = NULL;
3725         struct net_device *dev = NULL;
3726         struct inet6_ifaddr *ifa;
3727         struct sk_buff *skb;
3728         int err;
3729
3730         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3731         if (err < 0)
3732                 goto errout;
3733
3734         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3735         if (addr == NULL) {
3736                 err = -EINVAL;
3737                 goto errout;
3738         }
3739
3740         ifm = nlmsg_data(nlh);
3741         if (ifm->ifa_index)
3742                 dev = __dev_get_by_index(net, ifm->ifa_index);
3743
3744         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3745         if (!ifa) {
3746                 err = -EADDRNOTAVAIL;
3747                 goto errout;
3748         }
3749
3750         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3751         if (!skb) {
3752                 err = -ENOBUFS;
3753                 goto errout_ifa;
3754         }
3755
3756         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3757                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3758         if (err < 0) {
3759                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3760                 WARN_ON(err == -EMSGSIZE);
3761                 kfree_skb(skb);
3762                 goto errout_ifa;
3763         }
3764         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3765 errout_ifa:
3766         in6_ifa_put(ifa);
3767 errout:
3768         return err;
3769 }
3770
3771 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3772 {
3773         struct sk_buff *skb;
3774         struct net *net = dev_net(ifa->idev->dev);
3775         int err = -ENOBUFS;
3776
3777         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3778         if (skb == NULL)
3779                 goto errout;
3780
3781         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3782         if (err < 0) {
3783                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3784                 WARN_ON(err == -EMSGSIZE);
3785                 kfree_skb(skb);
3786                 goto errout;
3787         }
3788         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3789         return;
3790 errout:
3791         if (err < 0)
3792                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3793 }
3794
3795 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3796                                 __s32 *array, int bytes)
3797 {
3798         BUG_ON(bytes < (DEVCONF_MAX * 4));
3799
3800         memset(array, 0, bytes);
3801         array[DEVCONF_FORWARDING] = cnf->forwarding;
3802         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3803         array[DEVCONF_MTU6] = cnf->mtu6;
3804         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3805         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3806         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3807         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3808         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3809         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3810         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3811         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3812 #ifdef CONFIG_IPV6_PRIVACY
3813         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3814         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3815         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3816         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3817         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3818 #endif
3819         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3820         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3821         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3822 #ifdef CONFIG_IPV6_ROUTER_PREF
3823         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3824         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3825 #ifdef CONFIG_IPV6_ROUTE_INFO
3826         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3827 #endif
3828 #endif
3829         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3830         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3831 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3832         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3833 #endif
3834 #ifdef CONFIG_IPV6_MROUTE
3835         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3836 #endif
3837         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3838         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3839         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3840 }
3841
3842 static inline size_t inet6_if_nlmsg_size(void)
3843 {
3844         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3845                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3846                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3847                + nla_total_size(4) /* IFLA_MTU */
3848                + nla_total_size(4) /* IFLA_LINK */
3849                + nla_total_size( /* IFLA_PROTINFO */
3850                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3851                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3852                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3853                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3854                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3855                  );
3856 }
3857
3858 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3859                                       int items, int bytes)
3860 {
3861         int i;
3862         int pad = bytes - sizeof(u64) * items;
3863         BUG_ON(pad < 0);
3864
3865         /* Use put_unaligned() because stats may not be aligned for u64. */
3866         put_unaligned(items, &stats[0]);
3867         for (i = 1; i < items; i++)
3868                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3869
3870         memset(&stats[items], 0, pad);
3871 }
3872
3873 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3874                                       int items, int bytes, size_t syncpoff)
3875 {
3876         int i;
3877         int pad = bytes - sizeof(u64) * items;
3878         BUG_ON(pad < 0);
3879
3880         /* Use put_unaligned() because stats may not be aligned for u64. */
3881         put_unaligned(items, &stats[0]);
3882         for (i = 1; i < items; i++)
3883                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3884
3885         memset(&stats[items], 0, pad);
3886 }
3887
3888 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3889                              int bytes)
3890 {
3891         switch (attrtype) {
3892         case IFLA_INET6_STATS:
3893                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3894                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3895                 break;
3896         case IFLA_INET6_ICMP6STATS:
3897                 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3898                 break;
3899         }
3900 }
3901
3902 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3903                              u32 pid, u32 seq, int event, unsigned int flags)
3904 {
3905         struct net_device *dev = idev->dev;
3906         struct nlattr *nla;
3907         struct ifinfomsg *hdr;
3908         struct nlmsghdr *nlh;
3909         void *protoinfo;
3910         struct ifla_cacheinfo ci;
3911
3912         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3913         if (nlh == NULL)
3914                 return -EMSGSIZE;
3915
3916         hdr = nlmsg_data(nlh);
3917         hdr->ifi_family = AF_INET6;
3918         hdr->__ifi_pad = 0;
3919         hdr->ifi_type = dev->type;
3920         hdr->ifi_index = dev->ifindex;
3921         hdr->ifi_flags = dev_get_flags(dev);
3922         hdr->ifi_change = 0;
3923
3924         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3925
3926         if (dev->addr_len)
3927                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3928
3929         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3930         if (dev->ifindex != dev->iflink)
3931                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3932
3933         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3934         if (protoinfo == NULL)
3935                 goto nla_put_failure;
3936
3937         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3938
3939         ci.max_reasm_len = IPV6_MAXPLEN;
3940         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3941                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3942         ci.reachable_time = idev->nd_parms->reachable_time;
3943         ci.retrans_time = idev->nd_parms->retrans_time;
3944         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3945
3946         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3947         if (nla == NULL)
3948                 goto nla_put_failure;
3949         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3950
3951         /* XXX - MC not implemented */
3952
3953         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3954         if (nla == NULL)
3955                 goto nla_put_failure;
3956         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3957
3958         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3959         if (nla == NULL)
3960                 goto nla_put_failure;
3961         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3962
3963         nla_nest_end(skb, protoinfo);
3964         return nlmsg_end(skb, nlh);
3965
3966 nla_put_failure:
3967         nlmsg_cancel(skb, nlh);
3968         return -EMSGSIZE;
3969 }
3970
3971 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3972 {
3973         struct net *net = sock_net(skb->sk);
3974         int h, s_h;
3975         int idx = 0, s_idx;
3976         struct net_device *dev;
3977         struct inet6_dev *idev;
3978         struct hlist_head *head;
3979         struct hlist_node *node;
3980
3981         s_h = cb->args[0];
3982         s_idx = cb->args[1];
3983
3984         rcu_read_lock();
3985         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3986                 idx = 0;
3987                 head = &net->dev_index_head[h];
3988                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3989                         if (idx < s_idx)
3990                                 goto cont;
3991                         idev = __in6_dev_get(dev);
3992                         if (!idev)
3993                                 goto cont;
3994                         if (inet6_fill_ifinfo(skb, idev,
3995                                               NETLINK_CB(cb->skb).pid,
3996                                               cb->nlh->nlmsg_seq,
3997                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
3998                                 goto out;
3999 cont:
4000                         idx++;
4001                 }
4002         }
4003 out:
4004         rcu_read_unlock();
4005         cb->args[1] = idx;
4006         cb->args[0] = h;
4007
4008         return skb->len;
4009 }
4010
4011 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4012 {
4013         struct sk_buff *skb;
4014         struct net *net = dev_net(idev->dev);
4015         int err = -ENOBUFS;
4016
4017         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4018         if (skb == NULL)
4019                 goto errout;
4020
4021         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4022         if (err < 0) {
4023                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4024                 WARN_ON(err == -EMSGSIZE);
4025                 kfree_skb(skb);
4026                 goto errout;
4027         }
4028         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4029         return;
4030 errout:
4031         if (err < 0)
4032                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4033 }
4034
4035 static inline size_t inet6_prefix_nlmsg_size(void)
4036 {
4037         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4038                + nla_total_size(sizeof(struct in6_addr))
4039                + nla_total_size(sizeof(struct prefix_cacheinfo));
4040 }
4041
4042 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4043                              struct prefix_info *pinfo, u32 pid, u32 seq,
4044                              int event, unsigned int flags)
4045 {
4046         struct prefixmsg *pmsg;
4047         struct nlmsghdr *nlh;
4048         struct prefix_cacheinfo ci;
4049
4050         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4051         if (nlh == NULL)
4052                 return -EMSGSIZE;
4053
4054         pmsg = nlmsg_data(nlh);
4055         pmsg->prefix_family = AF_INET6;
4056         pmsg->prefix_pad1 = 0;
4057         pmsg->prefix_pad2 = 0;
4058         pmsg->prefix_ifindex = idev->dev->ifindex;
4059         pmsg->prefix_len = pinfo->prefix_len;
4060         pmsg->prefix_type = pinfo->type;
4061         pmsg->prefix_pad3 = 0;
4062         pmsg->prefix_flags = 0;
4063         if (pinfo->onlink)
4064                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4065         if (pinfo->autoconf)
4066                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4067
4068         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4069
4070         ci.preferred_time = ntohl(pinfo->prefered);
4071         ci.valid_time = ntohl(pinfo->valid);
4072         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4073
4074         return nlmsg_end(skb, nlh);
4075
4076 nla_put_failure:
4077         nlmsg_cancel(skb, nlh);
4078         return -EMSGSIZE;
4079 }
4080
4081 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4082                          struct prefix_info *pinfo)
4083 {
4084         struct sk_buff *skb;
4085         struct net *net = dev_net(idev->dev);
4086         int err = -ENOBUFS;
4087
4088         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4089         if (skb == NULL)
4090                 goto errout;
4091
4092         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4093         if (err < 0) {
4094                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4095                 WARN_ON(err == -EMSGSIZE);
4096                 kfree_skb(skb);
4097                 goto errout;
4098         }
4099         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4100         return;
4101 errout:
4102         if (err < 0)
4103                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4104 }
4105
4106 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4107 {
4108         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4109
4110         switch (event) {
4111         case RTM_NEWADDR:
4112                 /*
4113                  * If the address was optimistic
4114                  * we inserted the route at the start of
4115                  * our DAD process, so we don't need
4116                  * to do it again
4117                  */
4118                 if (!(ifp->rt->rt6i_node))
4119                         ip6_ins_rt(ifp->rt);
4120                 if (ifp->idev->cnf.forwarding)
4121                         addrconf_join_anycast(ifp);
4122                 break;
4123         case RTM_DELADDR:
4124                 if (ifp->idev->cnf.forwarding)
4125                         addrconf_leave_anycast(ifp);
4126                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4127                 dst_hold(&ifp->rt->dst);
4128
4129                 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4130                     ip6_del_rt(ifp->rt))
4131                         dst_free(&ifp->rt->dst);
4132                 break;
4133         }
4134 }
4135
4136 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4137 {
4138         rcu_read_lock_bh();
4139         if (likely(ifp->idev->dead == 0))
4140                 __ipv6_ifa_notify(event, ifp);
4141         rcu_read_unlock_bh();
4142 }
4143
4144 #ifdef CONFIG_SYSCTL
4145
4146 static
4147 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4148                            void __user *buffer, size_t *lenp, loff_t *ppos)
4149 {
4150         int *valp = ctl->data;
4151         int val = *valp;
4152         loff_t pos = *ppos;
4153         int ret;
4154
4155         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4156
4157         if (write)
4158                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4159         if (ret)
4160                 *ppos = pos;
4161         return ret;
4162 }
4163
4164 static void dev_disable_change(struct inet6_dev *idev)
4165 {
4166         if (!idev || !idev->dev)
4167                 return;
4168
4169         if (idev->cnf.disable_ipv6)
4170                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4171         else
4172                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4173 }
4174
4175 static void addrconf_disable_change(struct net *net, __s32 newf)
4176 {
4177         struct net_device *dev;
4178         struct inet6_dev *idev;
4179
4180         rcu_read_lock();
4181         for_each_netdev_rcu(net, dev) {
4182                 idev = __in6_dev_get(dev);
4183                 if (idev) {
4184                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4185                         idev->cnf.disable_ipv6 = newf;
4186                         if (changed)
4187                                 dev_disable_change(idev);
4188                 }
4189         }
4190         rcu_read_unlock();
4191 }
4192
4193 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4194 {
4195         struct net *net;
4196
4197         net = (struct net *)table->extra2;
4198
4199         if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4200                 return 0;
4201
4202         if (!rtnl_trylock()) {
4203                 /* Restore the original values before restarting */
4204                 *p = old;
4205                 return restart_syscall();
4206         }
4207
4208         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4209                 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4210                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4211                 addrconf_disable_change(net, newf);
4212         } else if ((!*p) ^ (!old))
4213                 dev_disable_change((struct inet6_dev *)table->extra1);
4214
4215         rtnl_unlock();
4216         return 0;
4217 }
4218
4219 static
4220 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4221                             void __user *buffer, size_t *lenp, loff_t *ppos)
4222 {
4223         int *valp = ctl->data;
4224         int val = *valp;
4225         loff_t pos = *ppos;
4226         int ret;
4227
4228         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4229
4230         if (write)
4231                 ret = addrconf_disable_ipv6(ctl, valp, val);
4232         if (ret)
4233                 *ppos = pos;
4234         return ret;
4235 }
4236
4237 static struct addrconf_sysctl_table
4238 {
4239         struct ctl_table_header *sysctl_header;
4240         ctl_table addrconf_vars[DEVCONF_MAX+1];
4241         char *dev_name;
4242 } addrconf_sysctl __read_mostly = {
4243         .sysctl_header = NULL,
4244         .addrconf_vars = {
4245                 {
4246                         .procname       = "forwarding",
4247                         .data           = &ipv6_devconf.forwarding,
4248                         .maxlen         = sizeof(int),
4249                         .mode           = 0644,
4250                         .proc_handler   = addrconf_sysctl_forward,
4251                 },
4252                 {
4253                         .procname       = "hop_limit",
4254                         .data           = &ipv6_devconf.hop_limit,
4255                         .maxlen         = sizeof(int),
4256                         .mode           = 0644,
4257                         .proc_handler   = proc_dointvec,
4258                 },
4259                 {
4260                         .procname       = "mtu",
4261                         .data           = &ipv6_devconf.mtu6,
4262                         .maxlen         = sizeof(int),
4263                         .mode           = 0644,
4264                         .proc_handler   = proc_dointvec,
4265                 },
4266                 {
4267                         .procname       = "accept_ra",
4268                         .data           = &ipv6_devconf.accept_ra,
4269                         .maxlen         = sizeof(int),
4270                         .mode           = 0644,
4271                         .proc_handler   = proc_dointvec,
4272                 },
4273                 {
4274                         .procname       = "accept_redirects",
4275                         .data           = &ipv6_devconf.accept_redirects,
4276                         .maxlen         = sizeof(int),
4277                         .mode           = 0644,
4278                         .proc_handler   = proc_dointvec,
4279                 },
4280                 {
4281                         .procname       = "autoconf",
4282                         .data           = &ipv6_devconf.autoconf,
4283                         .maxlen         = sizeof(int),
4284                         .mode           = 0644,
4285                         .proc_handler   = proc_dointvec,
4286                 },
4287                 {
4288                         .procname       = "dad_transmits",
4289                         .data           = &ipv6_devconf.dad_transmits,
4290                         .maxlen         = sizeof(int),
4291                         .mode           = 0644,
4292                         .proc_handler   = proc_dointvec,
4293                 },
4294                 {
4295                         .procname       = "router_solicitations",
4296                         .data           = &ipv6_devconf.rtr_solicits,
4297                         .maxlen         = sizeof(int),
4298                         .mode           = 0644,
4299                         .proc_handler   = proc_dointvec,
4300                 },
4301                 {
4302                         .procname       = "router_solicitation_interval",
4303                         .data           = &ipv6_devconf.rtr_solicit_interval,
4304                         .maxlen         = sizeof(int),
4305                         .mode           = 0644,
4306                         .proc_handler   = proc_dointvec_jiffies,
4307                 },
4308                 {
4309                         .procname       = "router_solicitation_delay",
4310                         .data           = &ipv6_devconf.rtr_solicit_delay,
4311                         .maxlen         = sizeof(int),
4312                         .mode           = 0644,
4313                         .proc_handler   = proc_dointvec_jiffies,
4314                 },
4315                 {
4316                         .procname       = "force_mld_version",
4317                         .data           = &ipv6_devconf.force_mld_version,
4318                         .maxlen         = sizeof(int),
4319                         .mode           = 0644,
4320                         .proc_handler   = proc_dointvec,
4321                 },
4322 #ifdef CONFIG_IPV6_PRIVACY
4323                 {
4324                         .procname       = "use_tempaddr",
4325                         .data           = &ipv6_devconf.use_tempaddr,
4326                         .maxlen         = sizeof(int),
4327                         .mode           = 0644,
4328                         .proc_handler   = proc_dointvec,
4329                 },
4330                 {
4331                         .procname       = "temp_valid_lft",
4332                         .data           = &ipv6_devconf.temp_valid_lft,
4333                         .maxlen         = sizeof(int),
4334                         .mode           = 0644,
4335                         .proc_handler   = proc_dointvec,
4336                 },
4337                 {
4338                         .procname       = "temp_prefered_lft",
4339                         .data           = &ipv6_devconf.temp_prefered_lft,
4340                         .maxlen         = sizeof(int),
4341                         .mode           = 0644,
4342                         .proc_handler   = proc_dointvec,
4343                 },
4344                 {
4345                         .procname       = "regen_max_retry",
4346                         .data           = &ipv6_devconf.regen_max_retry,
4347                         .maxlen         = sizeof(int),
4348                         .mode           = 0644,
4349                         .proc_handler   = proc_dointvec,
4350                 },
4351                 {
4352                         .procname       = "max_desync_factor",
4353                         .data           = &ipv6_devconf.max_desync_factor,
4354                         .maxlen         = sizeof(int),
4355                         .mode           = 0644,
4356                         .proc_handler   = proc_dointvec,
4357                 },
4358 #endif
4359                 {
4360                         .procname       = "max_addresses",
4361                         .data           = &ipv6_devconf.max_addresses,
4362                         .maxlen         = sizeof(int),
4363                         .mode           = 0644,
4364                         .proc_handler   = proc_dointvec,
4365                 },
4366                 {
4367                         .procname       = "accept_ra_defrtr",
4368                         .data           = &ipv6_devconf.accept_ra_defrtr,
4369                         .maxlen         = sizeof(int),
4370                         .mode           = 0644,
4371                         .proc_handler   = proc_dointvec,
4372                 },
4373                 {
4374                         .procname       = "accept_ra_pinfo",
4375                         .data           = &ipv6_devconf.accept_ra_pinfo,
4376                         .maxlen         = sizeof(int),
4377                         .mode           = 0644,
4378                         .proc_handler   = proc_dointvec,
4379                 },
4380 #ifdef CONFIG_IPV6_ROUTER_PREF
4381                 {
4382                         .procname       = "accept_ra_rtr_pref",
4383                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4384                         .maxlen         = sizeof(int),
4385                         .mode           = 0644,
4386                         .proc_handler   = proc_dointvec,
4387                 },
4388                 {
4389                         .procname       = "router_probe_interval",
4390                         .data           = &ipv6_devconf.rtr_probe_interval,
4391                         .maxlen         = sizeof(int),
4392                         .mode           = 0644,
4393                         .proc_handler   = proc_dointvec_jiffies,
4394                 },
4395 #ifdef CONFIG_IPV6_ROUTE_INFO
4396                 {
4397                         .procname       = "accept_ra_rt_info_max_plen",
4398                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4399                         .maxlen         = sizeof(int),
4400                         .mode           = 0644,
4401                         .proc_handler   = proc_dointvec,
4402                 },
4403 #endif
4404 #endif
4405                 {
4406                         .procname       = "proxy_ndp",
4407                         .data           = &ipv6_devconf.proxy_ndp,
4408                         .maxlen         = sizeof(int),
4409                         .mode           = 0644,
4410                         .proc_handler   = proc_dointvec,
4411                 },
4412                 {
4413                         .procname       = "accept_source_route",
4414                         .data           = &ipv6_devconf.accept_source_route,
4415                         .maxlen         = sizeof(int),
4416                         .mode           = 0644,
4417                         .proc_handler   = proc_dointvec,
4418                 },
4419 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4420                 {
4421                         .procname       = "optimistic_dad",
4422                         .data           = &ipv6_devconf.optimistic_dad,
4423                         .maxlen         = sizeof(int),
4424                         .mode           = 0644,
4425                         .proc_handler   = proc_dointvec,
4426
4427                 },
4428 #endif
4429 #ifdef CONFIG_IPV6_MROUTE
4430                 {
4431                         .procname       = "mc_forwarding",
4432                         .data           = &ipv6_devconf.mc_forwarding,
4433                         .maxlen         = sizeof(int),
4434                         .mode           = 0444,
4435                         .proc_handler   = proc_dointvec,
4436                 },
4437 #endif
4438                 {
4439                         .procname       = "disable_ipv6",
4440                         .data           = &ipv6_devconf.disable_ipv6,
4441                         .maxlen         = sizeof(int),
4442                         .mode           = 0644,
4443                         .proc_handler   = addrconf_sysctl_disable,
4444                 },
4445                 {
4446                         .procname       = "accept_dad",
4447                         .data           = &ipv6_devconf.accept_dad,
4448                         .maxlen         = sizeof(int),
4449                         .mode           = 0644,
4450                         .proc_handler   = proc_dointvec,
4451                 },
4452                 {
4453                         .procname       = "force_tllao",
4454                         .data           = &ipv6_devconf.force_tllao,
4455                         .maxlen         = sizeof(int),
4456                         .mode           = 0644,
4457                         .proc_handler   = proc_dointvec
4458                 },
4459                 {
4460                         /* sentinel */
4461                 }
4462         },
4463 };
4464
4465 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4466                 struct inet6_dev *idev, struct ipv6_devconf *p)
4467 {
4468         int i;
4469         struct addrconf_sysctl_table *t;
4470
4471 #define ADDRCONF_CTL_PATH_DEV   3
4472
4473         struct ctl_path addrconf_ctl_path[] = {
4474                 { .procname = "net", },
4475                 { .procname = "ipv6", },
4476                 { .procname = "conf", },
4477                 { /* to be set */ },
4478                 { },
4479         };
4480
4481
4482         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4483         if (t == NULL)
4484                 goto out;
4485
4486         for (i = 0; t->addrconf_vars[i].data; i++) {
4487                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4488                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4489                 t->addrconf_vars[i].extra2 = net;
4490         }
4491
4492         /*
4493          * Make a copy of dev_name, because '.procname' is regarded as const
4494          * by sysctl and we wouldn't want anyone to change it under our feet
4495          * (see SIOCSIFNAME).
4496          */
4497         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4498         if (!t->dev_name)
4499                 goto free;
4500
4501         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4502
4503         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4504                         t->addrconf_vars);
4505         if (t->sysctl_header == NULL)
4506                 goto free_procname;
4507
4508         p->sysctl = t;
4509         return 0;
4510
4511 free_procname:
4512         kfree(t->dev_name);
4513 free:
4514         kfree(t);
4515 out:
4516         return -ENOBUFS;
4517 }
4518
4519 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4520 {
4521         struct addrconf_sysctl_table *t;
4522
4523         if (p->sysctl == NULL)
4524                 return;
4525
4526         t = p->sysctl;
4527         p->sysctl = NULL;
4528         unregister_sysctl_table(t->sysctl_header);
4529         kfree(t->dev_name);
4530         kfree(t);
4531 }
4532
4533 static void addrconf_sysctl_register(struct inet6_dev *idev)
4534 {
4535         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4536                               &ndisc_ifinfo_sysctl_change);
4537         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4538                                         idev, &idev->cnf);
4539 }
4540
4541 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4542 {
4543         __addrconf_sysctl_unregister(&idev->cnf);
4544         neigh_sysctl_unregister(idev->nd_parms);
4545 }
4546
4547
4548 #endif
4549
4550 static int __net_init addrconf_init_net(struct net *net)
4551 {
4552         int err;
4553         struct ipv6_devconf *all, *dflt;
4554
4555         err = -ENOMEM;
4556         all = &ipv6_devconf;
4557         dflt = &ipv6_devconf_dflt;
4558
4559         if (!net_eq(net, &init_net)) {
4560                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4561                 if (all == NULL)
4562                         goto err_alloc_all;
4563
4564                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4565                 if (dflt == NULL)
4566                         goto err_alloc_dflt;
4567         } else {
4568                 /* these will be inherited by all namespaces */
4569                 dflt->autoconf = ipv6_defaults.autoconf;
4570                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4571         }
4572
4573         net->ipv6.devconf_all = all;
4574         net->ipv6.devconf_dflt = dflt;
4575
4576 #ifdef CONFIG_SYSCTL
4577         err = __addrconf_sysctl_register(net, "all", NULL, all);
4578         if (err < 0)
4579                 goto err_reg_all;
4580
4581         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4582         if (err < 0)
4583                 goto err_reg_dflt;
4584 #endif
4585         return 0;
4586
4587 #ifdef CONFIG_SYSCTL
4588 err_reg_dflt:
4589         __addrconf_sysctl_unregister(all);
4590 err_reg_all:
4591         kfree(dflt);
4592 #endif
4593 err_alloc_dflt:
4594         kfree(all);
4595 err_alloc_all:
4596         return err;
4597 }
4598
4599 static void __net_exit addrconf_exit_net(struct net *net)
4600 {
4601 #ifdef CONFIG_SYSCTL
4602         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4603         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4604 #endif
4605         if (!net_eq(net, &init_net)) {
4606                 kfree(net->ipv6.devconf_dflt);
4607                 kfree(net->ipv6.devconf_all);
4608         }
4609 }
4610
4611 static struct pernet_operations addrconf_ops = {
4612         .init = addrconf_init_net,
4613         .exit = addrconf_exit_net,
4614 };
4615
4616 /*
4617  *      Device notifier
4618  */
4619
4620 int register_inet6addr_notifier(struct notifier_block *nb)
4621 {
4622         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4623 }
4624 EXPORT_SYMBOL(register_inet6addr_notifier);
4625
4626 int unregister_inet6addr_notifier(struct notifier_block *nb)
4627 {
4628         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4629 }
4630 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4631
4632 /*
4633  *      Init / cleanup code
4634  */
4635
4636 int __init addrconf_init(void)
4637 {
4638         int i, err;
4639
4640         err = ipv6_addr_label_init();
4641         if (err < 0) {
4642                 printk(KERN_CRIT "IPv6 Addrconf:"
4643                        " cannot initialize default policy table: %d.\n", err);
4644                 goto out;
4645         }
4646
4647         err = register_pernet_subsys(&addrconf_ops);
4648         if (err < 0)
4649                 goto out_addrlabel;
4650
4651         /* The addrconf netdev notifier requires that loopback_dev
4652          * has it's ipv6 private information allocated and setup
4653          * before it can bring up and give link-local addresses
4654          * to other devices which are up.
4655          *
4656          * Unfortunately, loopback_dev is not necessarily the first
4657          * entry in the global dev_base list of net devices.  In fact,
4658          * it is likely to be the very last entry on that list.
4659          * So this causes the notifier registry below to try and
4660          * give link-local addresses to all devices besides loopback_dev
4661          * first, then loopback_dev, which cases all the non-loopback_dev
4662          * devices to fail to get a link-local address.
4663          *
4664          * So, as a temporary fix, allocate the ipv6 structure for
4665          * loopback_dev first by hand.
4666          * Longer term, all of the dependencies ipv6 has upon the loopback
4667          * device and it being up should be removed.
4668          */
4669         rtnl_lock();
4670         if (!ipv6_add_dev(init_net.loopback_dev))
4671                 err = -ENOMEM;
4672         rtnl_unlock();
4673         if (err)
4674                 goto errlo;
4675
4676         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4677                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4678
4679         register_netdevice_notifier(&ipv6_dev_notf);
4680
4681         addrconf_verify(0);
4682
4683         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4684         if (err < 0)
4685                 goto errout;
4686
4687         /* Only the first call to __rtnl_register can fail */
4688         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4689         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4690         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4691         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4692         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4693
4694         ipv6_addr_label_rtnl_register();
4695
4696         return 0;
4697 errout:
4698         unregister_netdevice_notifier(&ipv6_dev_notf);
4699 errlo:
4700         unregister_pernet_subsys(&addrconf_ops);
4701 out_addrlabel:
4702         ipv6_addr_label_cleanup();
4703 out:
4704         return err;
4705 }
4706
4707 void addrconf_cleanup(void)
4708 {
4709         struct net_device *dev;
4710         int i;
4711
4712         unregister_netdevice_notifier(&ipv6_dev_notf);
4713         unregister_pernet_subsys(&addrconf_ops);
4714         ipv6_addr_label_cleanup();
4715
4716         rtnl_lock();
4717
4718         /* clean dev list */
4719         for_each_netdev(&init_net, dev) {
4720                 if (__in6_dev_get(dev) == NULL)
4721                         continue;
4722                 addrconf_ifdown(dev, 1);
4723         }
4724         addrconf_ifdown(init_net.loopback_dev, 2);
4725
4726         /*
4727          *      Check hash table.
4728          */
4729         spin_lock_bh(&addrconf_hash_lock);
4730         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4731                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4732         spin_unlock_bh(&addrconf_hash_lock);
4733
4734         del_timer(&addr_chk_timer);
4735         rtnl_unlock();
4736 }