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   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      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 #ifdef CONFIG_SYSCTL
  57 #include <linux/sysctl.h>
  58 #endif
  59 #include <linux/capability.h>
  60 #include <linux/delay.h>
  61 #include <linux/notifier.h>
  62 #include <linux/string.h>
  63
  64 #include <net/net_namespace.h>
  65 #include <net/sock.h>
  66 #include <net/snmp.h>
  67
  68 #include <net/ipv6.h>
  69 #include <net/protocol.h>
  70 #include <net/ndisc.h>
  71 #include <net/ip6_route.h>
  72 #include <net/addrconf.h>
  73 #include <net/tcp.h>
  74 #include <net/ip.h>
  75 #include <net/netlink.h>
  76 #include <net/pkt_sched.h>
  77 #include <linux/if_tunnel.h>
  78 #include <linux/rtnetlink.h>
  79
  80 #ifdef CONFIG_IPV6_PRIVACY
  81 #include <linux/random.h>
  82 #endif
  83
  84 #include <asm/uaccess.h>
  85 #include <asm/unaligned.h>
  86
  87 #include <linux/proc_fs.h>
  88 #include <linux/seq_file.h>
  89
  90 /* Set to 3 to get tracing... */
  91 #define ACONF_DEBUG 2
  92
  93 #if ACONF_DEBUG >= 3
  94 #define ADBG(x) printk x
  95 #else
  96 #define ADBG(x)
  97 #endif
  98
  99 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 101
 102 #ifdef CONFIG_SYSCTL
 103 static void addrconf_sysctl_register(struct inet6_dev *idev);
 104 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 105 #else
 106 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 107 {
 108 }
 109
 110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 111 {
 112 }
 113 #endif
 114
 115 #ifdef CONFIG_IPV6_PRIVACY
 116 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 118 static void ipv6_regen_rndid(unsigned long data);
 119
 120 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 121 #endif
 122
 123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 124 static int ipv6_count_addresses(struct inet6_dev *idev);
 125
 126 /*
 127  *      Configured unicast address hash table
 128  */
 129 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 130 static DEFINE_RWLOCK(addrconf_hash_lock);
 131
 132 static void addrconf_verify(unsigned long);
 133
 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 135 static DEFINE_SPINLOCK(addrconf_verify_lock);
 136
 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 139
 140 static int addrconf_ifdown(struct net_device *dev, int how);
 141
 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 143 static void addrconf_dad_timer(unsigned long data);
 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 145 static void addrconf_dad_run(struct inet6_dev *idev);
 146 static void addrconf_rs_timer(unsigned long data);
 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 149
 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 151                                 struct prefix_info *pinfo);
 152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 153                               struct net_device *dev);
 154
 155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 156
 157 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 158         .forwarding             = 0,
 159         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 160         .mtu6                   = IPV6_MIN_MTU,
 161         .accept_ra              = 1,
 162         .accept_redirects       = 1,
 163         .autoconf               = 1,
 164         .force_mld_version      = 0,
 165         .dad_transmits          = 1,
 166         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 167         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 168         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 169 #ifdef CONFIG_IPV6_PRIVACY
 170         .use_tempaddr           = 0,
 171         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 172         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 173         .regen_max_retry        = REGEN_MAX_RETRY,
 174         .max_desync_factor      = MAX_DESYNC_FACTOR,
 175 #endif
 176         .max_addresses          = IPV6_MAX_ADDRESSES,
 177         .accept_ra_defrtr       = 1,
 178         .accept_ra_pinfo        = 1,
 179 #ifdef CONFIG_IPV6_ROUTER_PREF
 180         .accept_ra_rtr_pref     = 1,
 181         .rtr_probe_interval     = 60 * HZ,
 182 #ifdef CONFIG_IPV6_ROUTE_INFO
 183         .accept_ra_rt_info_max_plen = 0,
 184 #endif
 185 #endif
 186         .proxy_ndp              = 0,
 187         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 188         .disable_ipv6           = 0,
 189         .accept_dad             = 1,
 190 };
 191
 192 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 193         .forwarding             = 0,
 194         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 195         .mtu6                   = IPV6_MIN_MTU,
 196         .accept_ra              = 1,
 197         .accept_redirects       = 1,
 198         .autoconf               = 1,
 199         .dad_transmits          = 1,
 200         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 201         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 202         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 203 #ifdef CONFIG_IPV6_PRIVACY
 204         .use_tempaddr           = 0,
 205         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 206         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 207         .regen_max_retry        = REGEN_MAX_RETRY,
 208         .max_desync_factor      = MAX_DESYNC_FACTOR,
 209 #endif
 210         .max_addresses          = IPV6_MAX_ADDRESSES,
 211         .accept_ra_defrtr       = 1,
 212         .accept_ra_pinfo        = 1,
 213 #ifdef CONFIG_IPV6_ROUTER_PREF
 214         .accept_ra_rtr_pref     = 1,
 215         .rtr_probe_interval     = 60 * HZ,
 216 #ifdef CONFIG_IPV6_ROUTE_INFO
 217         .accept_ra_rt_info_max_plen = 0,
 218 #endif
 219 #endif
 220         .proxy_ndp              = 0,
 221         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 222         .disable_ipv6           = 0,
 223         .accept_dad             = 1,
 224 };
 225
 226 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 227 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 228 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 229 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 230 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 231
 232 /* Check if a valid qdisc is available */
 233 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 234 {
 235         return !qdisc_tx_is_noop(dev);
 236 }
 237
 238 /* Check if a route is valid prefix route */
 239 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 240 {
 241         return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
 242 }
 243
 244 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 245 {
 246         if (del_timer(&ifp->timer))
 247                 __in6_ifa_put(ifp);
 248 }
 249
 250 enum addrconf_timer_t
 251 {
 252         AC_NONE,
 253         AC_DAD,
 254         AC_RS,
 255 };
 256
 257 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 258                                enum addrconf_timer_t what,
 259                                unsigned long when)
 260 {
 261         if (!del_timer(&ifp->timer))
 262                 in6_ifa_hold(ifp);
 263
 264         switch (what) {
 265         case AC_DAD:
 266                 ifp->timer.function = addrconf_dad_timer;
 267                 break;
 268         case AC_RS:
 269                 ifp->timer.function = addrconf_rs_timer;
 270                 break;
 271         default:;
 272         }
 273         ifp->timer.expires = jiffies + when;
 274         add_timer(&ifp->timer);
 275 }
 276
 277 static int snmp6_alloc_dev(struct inet6_dev *idev)
 278 {
 279         if (snmp_mib_init((void **)idev->stats.ipv6,
 280                           sizeof(struct ipstats_mib)) < 0)
 281                 goto err_ip;
 282         if (snmp_mib_init((void **)idev->stats.icmpv6,
 283                           sizeof(struct icmpv6_mib)) < 0)
 284                 goto err_icmp;
 285         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 286                           sizeof(struct icmpv6msg_mib)) < 0)
 287                 goto err_icmpmsg;
 288
 289         return 0;
 290
 291 err_icmpmsg:
 292         snmp_mib_free((void **)idev->stats.icmpv6);
 293 err_icmp:
 294         snmp_mib_free((void **)idev->stats.ipv6);
 295 err_ip:
 296         return -ENOMEM;
 297 }
 298
 299 static void snmp6_free_dev(struct inet6_dev *idev)
 300 {
 301         snmp_mib_free((void **)idev->stats.icmpv6msg);
 302         snmp_mib_free((void **)idev->stats.icmpv6);
 303         snmp_mib_free((void **)idev->stats.ipv6);
 304 }
 305
 306 /* Nobody refers to this device, we may destroy it. */
 307
 308 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 309 {
 310         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 311         kfree(idev);
 312 }
 313
 314 void in6_dev_finish_destroy(struct inet6_dev *idev)
 315 {
 316         struct net_device *dev = idev->dev;
 317
 318         WARN_ON(idev->addr_list != NULL);
 319         WARN_ON(idev->mc_list != NULL);
 320
 321 #ifdef NET_REFCNT_DEBUG
 322         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 323 #endif
 324         dev_put(dev);
 325         if (!idev->dead) {
 326                 printk("Freeing alive inet6 device %p\n", idev);
 327                 return;
 328         }
 329         snmp6_free_dev(idev);
 330         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 331 }
 332
 333 EXPORT_SYMBOL(in6_dev_finish_destroy);
 334
 335 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 336 {
 337         struct inet6_dev *ndev;
 338
 339         ASSERT_RTNL();
 340
 341         if (dev->mtu < IPV6_MIN_MTU)
 342                 return NULL;
 343
 344         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 345
 346         if (ndev == NULL)
 347                 return NULL;
 348
 349         rwlock_init(&ndev->lock);
 350         ndev->dev = dev;
 351         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 352         ndev->cnf.mtu6 = dev->mtu;
 353         ndev->cnf.sysctl = NULL;
 354         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 355         if (ndev->nd_parms == NULL) {
 356                 kfree(ndev);
 357                 return NULL;
 358         }
 359         if (ndev->cnf.forwarding)
 360                 dev_disable_lro(dev);
 361         /* We refer to the device */
 362         dev_hold(dev);
 363
 364         if (snmp6_alloc_dev(ndev) < 0) {
 365                 ADBG((KERN_WARNING
 366                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 367                         __func__, dev->name));
 368                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 369                 ndev->dead = 1;
 370                 in6_dev_finish_destroy(ndev);
 371                 return NULL;
 372         }
 373
 374         if (snmp6_register_dev(ndev) < 0) {
 375                 ADBG((KERN_WARNING
 376                         "%s(): cannot create /proc/net/dev_snmp6/%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         /* One reference from device.  We must do this before
 385          * we invoke __ipv6_regen_rndid().
 386          */
 387         in6_dev_hold(ndev);
 388
 389         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 390                 ndev->cnf.accept_dad = -1;
 391
 392 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 393         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 394                 printk(KERN_INFO
 395                        "%s: Disabled Multicast RS\n",
 396                        dev->name);
 397                 ndev->cnf.rtr_solicits = 0;
 398         }
 399 #endif
 400
 401 #ifdef CONFIG_IPV6_PRIVACY
 402         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 403         if ((dev->flags&IFF_LOOPBACK) ||
 404             dev->type == ARPHRD_TUNNEL ||
 405             dev->type == ARPHRD_TUNNEL6 ||
 406             dev->type == ARPHRD_SIT ||
 407             dev->type == ARPHRD_NONE) {
 408                 printk(KERN_INFO
 409                        "%s: Disabled Privacy Extensions\n",
 410                        dev->name);
 411                 ndev->cnf.use_tempaddr = -1;
 412         } else {
 413                 in6_dev_hold(ndev);
 414                 ipv6_regen_rndid((unsigned long) ndev);
 415         }
 416 #endif
 417
 418         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 419                 ndev->if_flags |= IF_READY;
 420
 421         ipv6_mc_init_dev(ndev);
 422         ndev->tstamp = jiffies;
 423         addrconf_sysctl_register(ndev);
 424         /* protected by rtnl_lock */
 425         rcu_assign_pointer(dev->ip6_ptr, ndev);
 426
 427         /* Join all-node multicast group */
 428         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 429
 430         return ndev;
 431 }
 432
 433 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 434 {
 435         struct inet6_dev *idev;
 436
 437         ASSERT_RTNL();
 438
 439         if ((idev = __in6_dev_get(dev)) == NULL) {
 440                 if ((idev = ipv6_add_dev(dev)) == NULL)
 441                         return NULL;
 442         }
 443
 444         if (dev->flags&IFF_UP)
 445                 ipv6_mc_up(idev);
 446         return idev;
 447 }
 448
 449 #ifdef CONFIG_SYSCTL
 450 static void dev_forward_change(struct inet6_dev *idev)
 451 {
 452         struct net_device *dev;
 453         struct inet6_ifaddr *ifa;
 454
 455         if (!idev)
 456                 return;
 457         dev = idev->dev;
 458         if (idev->cnf.forwarding)
 459                 dev_disable_lro(dev);
 460         if (dev && (dev->flags & IFF_MULTICAST)) {
 461                 if (idev->cnf.forwarding)
 462                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 463                 else
 464                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 465         }
 466         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 467                 if (ifa->flags&IFA_F_TENTATIVE)
 468                         continue;
 469                 if (idev->cnf.forwarding)
 470                         addrconf_join_anycast(ifa);
 471                 else
 472                         addrconf_leave_anycast(ifa);
 473         }
 474 }
 475
 476
 477 static void addrconf_forward_change(struct net *net, __s32 newf)
 478 {
 479         struct net_device *dev;
 480         struct inet6_dev *idev;
 481
 482         read_lock(&dev_base_lock);
 483         for_each_netdev(net, dev) {
 484                 rcu_read_lock();
 485                 idev = __in6_dev_get(dev);
 486                 if (idev) {
 487                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 488                         idev->cnf.forwarding = newf;
 489                         if (changed)
 490                                 dev_forward_change(idev);
 491                 }
 492                 rcu_read_unlock();
 493         }
 494         read_unlock(&dev_base_lock);
 495 }
 496
 497 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 498 {
 499         struct net *net;
 500
 501         net = (struct net *)table->extra2;
 502         if (p == &net->ipv6.devconf_dflt->forwarding)
 503                 return 0;
 504
 505         if (!rtnl_trylock())
 506                 return restart_syscall();
 507
 508         if (p == &net->ipv6.devconf_all->forwarding) {
 509                 __s32 newf = net->ipv6.devconf_all->forwarding;
 510                 net->ipv6.devconf_dflt->forwarding = newf;
 511                 addrconf_forward_change(net, newf);
 512         } else if ((!*p) ^ (!old))
 513                 dev_forward_change((struct inet6_dev *)table->extra1);
 514         rtnl_unlock();
 515
 516         if (*p)
 517                 rt6_purge_dflt_routers(net);
 518         return 1;
 519 }
 520 #endif
 521
 522 /* Nobody refers to this ifaddr, destroy it */
 523
 524 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 525 {
 526         WARN_ON(ifp->if_next != NULL);
 527         WARN_ON(ifp->lst_next != NULL);
 528
 529 #ifdef NET_REFCNT_DEBUG
 530         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 531 #endif
 532
 533         in6_dev_put(ifp->idev);
 534
 535         if (del_timer(&ifp->timer))
 536                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 537
 538         if (!ifp->dead) {
 539                 printk("Freeing alive inet6 address %p\n", ifp);
 540                 return;
 541         }
 542         dst_release(&ifp->rt->u.dst);
 543
 544         kfree(ifp);
 545 }
 546
 547 static void
 548 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 549 {
 550         struct inet6_ifaddr *ifa, **ifap;
 551         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 552
 553         /*
 554          * Each device address list is sorted in order of scope -
 555          * global before linklocal.
 556          */
 557         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 558              ifap = &ifa->if_next) {
 559                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 560                         break;
 561         }
 562
 563         ifp->if_next = *ifap;
 564         *ifap = ifp;
 565 }
 566
 567 /*
 568  *      Hash function taken from net_alias.c
 569  */
 570 static u8 ipv6_addr_hash(const struct in6_addr *addr)
 571 {
 572         __u32 word;
 573
 574         /*
 575          * We perform the hash function over the last 64 bits of the address
 576          * This will include the IEEE address token on links that support it.
 577          */
 578
 579         word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
 580         word ^= (word >> 16);
 581         word ^= (word >> 8);
 582
 583         return ((word ^ (word >> 4)) & 0x0f);
 584 }
 585
 586 /* On success it returns ifp with increased reference count */
 587
 588 static struct inet6_ifaddr *
 589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 590               int scope, u32 flags)
 591 {
 592         struct inet6_ifaddr *ifa = NULL;
 593         struct rt6_info *rt;
 594         int hash;
 595         int err = 0;
 596         int addr_type = ipv6_addr_type(addr);
 597
 598         if (addr_type == IPV6_ADDR_ANY ||
 599             addr_type & IPV6_ADDR_MULTICAST ||
 600             (!(idev->dev->flags & IFF_LOOPBACK) &&
 601              addr_type & IPV6_ADDR_LOOPBACK))
 602                 return ERR_PTR(-EADDRNOTAVAIL);
 603
 604         rcu_read_lock_bh();
 605         if (idev->dead) {
 606                 err = -ENODEV;                  /*XXX*/
 607                 goto out2;
 608         }
 609
 610         if (idev->cnf.disable_ipv6) {
 611                 err = -EACCES;
 612                 goto out2;
 613         }
 614
 615         write_lock(&addrconf_hash_lock);
 616
 617         /* Ignore adding duplicate addresses on an interface */
 618         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 619                 ADBG(("ipv6_add_addr: already assigned\n"));
 620                 err = -EEXIST;
 621                 goto out;
 622         }
 623
 624         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 625
 626         if (ifa == NULL) {
 627                 ADBG(("ipv6_add_addr: malloc failed\n"));
 628                 err = -ENOBUFS;
 629                 goto out;
 630         }
 631
 632         rt = addrconf_dst_alloc(idev, addr, 0);
 633         if (IS_ERR(rt)) {
 634                 err = PTR_ERR(rt);
 635                 goto out;
 636         }
 637
 638         ipv6_addr_copy(&ifa->addr, addr);
 639
 640         spin_lock_init(&ifa->lock);
 641         init_timer(&ifa->timer);
 642         ifa->timer.data = (unsigned long) ifa;
 643         ifa->scope = scope;
 644         ifa->prefix_len = pfxlen;
 645         ifa->flags = flags | IFA_F_TENTATIVE;
 646         ifa->cstamp = ifa->tstamp = jiffies;
 647
 648         ifa->rt = rt;
 649
 650         /*
 651          * part one of RFC 4429, section 3.3
 652          * We should not configure an address as
 653          * optimistic if we do not yet know the link
 654          * layer address of our nexhop router
 655          */
 656
 657         if (rt->rt6i_nexthop == NULL)
 658                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 659
 660         ifa->idev = idev;
 661         in6_dev_hold(idev);
 662         /* For caller */
 663         in6_ifa_hold(ifa);
 664
 665         /* Add to big hash table */
 666         hash = ipv6_addr_hash(addr);
 667
 668         ifa->lst_next = inet6_addr_lst[hash];
 669         inet6_addr_lst[hash] = ifa;
 670         in6_ifa_hold(ifa);
 671         write_unlock(&addrconf_hash_lock);
 672
 673         write_lock(&idev->lock);
 674         /* Add to inet6_dev unicast addr list. */
 675         ipv6_link_dev_addr(idev, ifa);
 676
 677 #ifdef CONFIG_IPV6_PRIVACY
 678         if (ifa->flags&IFA_F_TEMPORARY) {
 679                 ifa->tmp_next = idev->tempaddr_list;
 680                 idev->tempaddr_list = ifa;
 681                 in6_ifa_hold(ifa);
 682         }
 683 #endif
 684
 685         in6_ifa_hold(ifa);
 686         write_unlock(&idev->lock);
 687 out2:
 688         rcu_read_unlock_bh();
 689
 690         if (likely(err == 0))
 691                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 692         else {
 693                 kfree(ifa);
 694                 ifa = ERR_PTR(err);
 695         }
 696
 697         return ifa;
 698 out:
 699         write_unlock(&addrconf_hash_lock);
 700         goto out2;
 701 }
 702
 703 /* This function wants to get referenced ifp and releases it before return */
 704
 705 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 706 {
 707         struct inet6_ifaddr *ifa, **ifap;
 708         struct inet6_dev *idev = ifp->idev;
 709         int hash;
 710         int deleted = 0, onlink = 0;
 711         unsigned long expires = jiffies;
 712
 713         hash = ipv6_addr_hash(&ifp->addr);
 714
 715         ifp->dead = 1;
 716
 717         write_lock_bh(&addrconf_hash_lock);
 718         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 719              ifap = &ifa->lst_next) {
 720                 if (ifa == ifp) {
 721                         *ifap = ifa->lst_next;
 722                         __in6_ifa_put(ifp);
 723                         ifa->lst_next = NULL;
 724                         break;
 725                 }
 726         }
 727         write_unlock_bh(&addrconf_hash_lock);
 728
 729         write_lock_bh(&idev->lock);
 730 #ifdef CONFIG_IPV6_PRIVACY
 731         if (ifp->flags&IFA_F_TEMPORARY) {
 732                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 733                      ifap = &ifa->tmp_next) {
 734                         if (ifa == ifp) {
 735                                 *ifap = ifa->tmp_next;
 736                                 if (ifp->ifpub) {
 737                                         in6_ifa_put(ifp->ifpub);
 738                                         ifp->ifpub = NULL;
 739                                 }
 740                                 __in6_ifa_put(ifp);
 741                                 ifa->tmp_next = NULL;
 742                                 break;
 743                         }
 744                 }
 745         }
 746 #endif
 747
 748         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 749                 if (ifa == ifp) {
 750                         *ifap = ifa->if_next;
 751                         __in6_ifa_put(ifp);
 752                         ifa->if_next = NULL;
 753                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 754                                 break;
 755                         deleted = 1;
 756                         continue;
 757                 } else if (ifp->flags & IFA_F_PERMANENT) {
 758                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 759                                               ifp->prefix_len)) {
 760                                 if (ifa->flags & IFA_F_PERMANENT) {
 761                                         onlink = 1;
 762                                         if (deleted)
 763                                                 break;
 764                                 } else {
 765                                         unsigned long lifetime;
 766
 767                                         if (!onlink)
 768                                                 onlink = -1;
 769
 770                                         spin_lock(&ifa->lock);
 771
 772                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 773                                         /*
 774                                          * Note: Because this address is
 775                                          * not permanent, lifetime <
 776                                          * LONG_MAX / HZ here.
 777                                          */
 778                                         if (time_before(expires,
 779                                                         ifa->tstamp + lifetime * HZ))
 780                                                 expires = ifa->tstamp + lifetime * HZ;
 781                                         spin_unlock(&ifa->lock);
 782                                 }
 783                         }
 784                 }
 785                 ifap = &ifa->if_next;
 786         }
 787         write_unlock_bh(&idev->lock);
 788
 789         addrconf_del_timer(ifp);
 790
 791         ipv6_ifa_notify(RTM_DELADDR, ifp);
 792
 793         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 794
 795         /*
 796          * Purge or update corresponding prefix
 797          *
 798          * 1) we don't purge prefix here if address was not permanent.
 799          *    prefix is managed by its own lifetime.
 800          * 2) if there're no addresses, delete prefix.
 801          * 3) if there're still other permanent address(es),
 802          *    corresponding prefix is still permanent.
 803          * 4) otherwise, update prefix lifetime to the
 804          *    longest valid lifetime among the corresponding
 805          *    addresses on the device.
 806          *    Note: subsequent RA will update lifetime.
 807          *
 808          * --yoshfuji
 809          */
 810         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 811                 struct in6_addr prefix;
 812                 struct rt6_info *rt;
 813                 struct net *net = dev_net(ifp->idev->dev);
 814                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 815                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 816
 817                 if (rt && addrconf_is_prefix_route(rt)) {
 818                         if (onlink == 0) {
 819                                 ip6_del_rt(rt);
 820                                 rt = NULL;
 821                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 822                                 rt->rt6i_expires = expires;
 823                                 rt->rt6i_flags |= RTF_EXPIRES;
 824                         }
 825                 }
 826                 dst_release(&rt->u.dst);
 827         }
 828
 829         in6_ifa_put(ifp);
 830 }
 831
 832 #ifdef CONFIG_IPV6_PRIVACY
 833 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 834 {
 835         struct inet6_dev *idev = ifp->idev;
 836         struct in6_addr addr, *tmpaddr;
 837         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 838         unsigned long regen_advance;
 839         int tmp_plen;
 840         int ret = 0;
 841         int max_addresses;
 842         u32 addr_flags;
 843
 844         write_lock(&idev->lock);
 845         if (ift) {
 846                 spin_lock_bh(&ift->lock);
 847                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 848                 spin_unlock_bh(&ift->lock);
 849                 tmpaddr = &addr;
 850         } else {
 851                 tmpaddr = NULL;
 852         }
 853 retry:
 854         in6_dev_hold(idev);
 855         if (idev->cnf.use_tempaddr <= 0) {
 856                 write_unlock(&idev->lock);
 857                 printk(KERN_INFO
 858                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 859                 in6_dev_put(idev);
 860                 ret = -1;
 861                 goto out;
 862         }
 863         spin_lock_bh(&ifp->lock);
 864         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 865                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 866                 spin_unlock_bh(&ifp->lock);
 867                 write_unlock(&idev->lock);
 868                 printk(KERN_WARNING
 869                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 870                 in6_dev_put(idev);
 871                 ret = -1;
 872                 goto out;
 873         }
 874         in6_ifa_hold(ifp);
 875         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 876         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 877                 spin_unlock_bh(&ifp->lock);
 878                 write_unlock(&idev->lock);
 879                 printk(KERN_WARNING
 880                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 881                 in6_ifa_put(ifp);
 882                 in6_dev_put(idev);
 883                 ret = -1;
 884                 goto out;
 885         }
 886         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 887         tmp_valid_lft = min_t(__u32,
 888                               ifp->valid_lft,
 889                               idev->cnf.temp_valid_lft);
 890         tmp_prefered_lft = min_t(__u32,
 891                                  ifp->prefered_lft,
 892                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 893         tmp_plen = ifp->prefix_len;
 894         max_addresses = idev->cnf.max_addresses;
 895         tmp_cstamp = ifp->cstamp;
 896         tmp_tstamp = ifp->tstamp;
 897         spin_unlock_bh(&ifp->lock);
 898
 899         regen_advance = idev->cnf.regen_max_retry *
 900                         idev->cnf.dad_transmits *
 901                         idev->nd_parms->retrans_time / HZ;
 902         write_unlock(&idev->lock);
 903
 904         /* A temporary address is created only if this calculated Preferred
 905          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 906          * an implementation must not create a temporary address with a zero
 907          * Preferred Lifetime.
 908          */
 909         if (tmp_prefered_lft <= regen_advance) {
 910                 in6_ifa_put(ifp);
 911                 in6_dev_put(idev);
 912                 ret = -1;
 913                 goto out;
 914         }
 915
 916         addr_flags = IFA_F_TEMPORARY;
 917         /* set in addrconf_prefix_rcv() */
 918         if (ifp->flags & IFA_F_OPTIMISTIC)
 919                 addr_flags |= IFA_F_OPTIMISTIC;
 920
 921         ift = !max_addresses ||
 922               ipv6_count_addresses(idev) < max_addresses ?
 923                 ipv6_add_addr(idev, &addr, tmp_plen,
 924                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 925                               addr_flags) : NULL;
 926         if (!ift || IS_ERR(ift)) {
 927                 in6_ifa_put(ifp);
 928                 in6_dev_put(idev);
 929                 printk(KERN_INFO
 930                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 931                 tmpaddr = &addr;
 932                 write_lock(&idev->lock);
 933                 goto retry;
 934         }
 935
 936         spin_lock_bh(&ift->lock);
 937         ift->ifpub = ifp;
 938         ift->valid_lft = tmp_valid_lft;
 939         ift->prefered_lft = tmp_prefered_lft;
 940         ift->cstamp = tmp_cstamp;
 941         ift->tstamp = tmp_tstamp;
 942         spin_unlock_bh(&ift->lock);
 943
 944         addrconf_dad_start(ift, 0);
 945         in6_ifa_put(ift);
 946         in6_dev_put(idev);
 947 out:
 948         return ret;
 949 }
 950 #endif
 951
 952 /*
 953  *      Choose an appropriate source address (RFC3484)
 954  */
 955 enum {
 956         IPV6_SADDR_RULE_INIT = 0,
 957         IPV6_SADDR_RULE_LOCAL,
 958         IPV6_SADDR_RULE_SCOPE,
 959         IPV6_SADDR_RULE_PREFERRED,
 960 #ifdef CONFIG_IPV6_MIP6
 961         IPV6_SADDR_RULE_HOA,
 962 #endif
 963         IPV6_SADDR_RULE_OIF,
 964         IPV6_SADDR_RULE_LABEL,
 965 #ifdef CONFIG_IPV6_PRIVACY
 966         IPV6_SADDR_RULE_PRIVACY,
 967 #endif
 968         IPV6_SADDR_RULE_ORCHID,
 969         IPV6_SADDR_RULE_PREFIX,
 970         IPV6_SADDR_RULE_MAX
 971 };
 972
 973 struct ipv6_saddr_score {
 974         int                     rule;
 975         int                     addr_type;
 976         struct inet6_ifaddr     *ifa;
 977         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 978         int                     scopedist;
 979         int                     matchlen;
 980 };
 981
 982 struct ipv6_saddr_dst {
 983         const struct in6_addr *addr;
 984         int ifindex;
 985         int scope;
 986         int label;
 987         unsigned int prefs;
 988 };
 989
 990 static inline int ipv6_saddr_preferred(int type)
 991 {
 992         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 993                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 994                 return 1;
 995         return 0;
 996 }
 997
 998 static int ipv6_get_saddr_eval(struct net *net,
 999                                struct ipv6_saddr_score *score,
1000                                struct ipv6_saddr_dst *dst,
1001                                int i)
1002 {
1003         int ret;
1004
1005         if (i <= score->rule) {
1006                 switch (i) {
1007                 case IPV6_SADDR_RULE_SCOPE:
1008                         ret = score->scopedist;
1009                         break;
1010                 case IPV6_SADDR_RULE_PREFIX:
1011                         ret = score->matchlen;
1012                         break;
1013                 default:
1014                         ret = !!test_bit(i, score->scorebits);
1015                 }
1016                 goto out;
1017         }
1018
1019         switch (i) {
1020         case IPV6_SADDR_RULE_INIT:
1021                 /* Rule 0: remember if hiscore is not ready yet */
1022                 ret = !!score->ifa;
1023                 break;
1024         case IPV6_SADDR_RULE_LOCAL:
1025                 /* Rule 1: Prefer same address */
1026                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1027                 break;
1028         case IPV6_SADDR_RULE_SCOPE:
1029                 /* Rule 2: Prefer appropriate scope
1030                  *
1031                  *      ret
1032                  *       ^
1033                  *    -1 |  d 15
1034                  *    ---+--+-+---> scope
1035                  *       |
1036                  *       |             d is scope of the destination.
1037                  *  B-d  |  \
1038                  *       |   \      <- smaller scope is better if
1039                  *  B-15 |    \        if scope is enough for destinaion.
1040                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1041                  * d-C-1 | /
1042                  *       |/         <- greater is better
1043                  *   -C  /             if scope is not enough for destination.
1044                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1045                  *
1046                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1047                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1048                  * Assume B = 0 and we get C > 29.
1049                  */
1050                 ret = __ipv6_addr_src_scope(score->addr_type);
1051                 if (ret >= dst->scope)
1052                         ret = -ret;
1053                 else
1054                         ret -= 128;     /* 30 is enough */
1055                 score->scopedist = ret;
1056                 break;
1057         case IPV6_SADDR_RULE_PREFERRED:
1058                 /* Rule 3: Avoid deprecated and optimistic addresses */
1059                 ret = ipv6_saddr_preferred(score->addr_type) ||
1060                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1061                 break;
1062 #ifdef CONFIG_IPV6_MIP6
1063         case IPV6_SADDR_RULE_HOA:
1064             {
1065                 /* Rule 4: Prefer home address */
1066                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1067                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1068                 break;
1069             }
1070 #endif
1071         case IPV6_SADDR_RULE_OIF:
1072                 /* Rule 5: Prefer outgoing interface */
1073                 ret = (!dst->ifindex ||
1074                        dst->ifindex == score->ifa->idev->dev->ifindex);
1075                 break;
1076         case IPV6_SADDR_RULE_LABEL:
1077                 /* Rule 6: Prefer matching label */
1078                 ret = ipv6_addr_label(net,
1079                                       &score->ifa->addr, score->addr_type,
1080                                       score->ifa->idev->dev->ifindex) == dst->label;
1081                 break;
1082 #ifdef CONFIG_IPV6_PRIVACY
1083         case IPV6_SADDR_RULE_PRIVACY:
1084             {
1085                 /* Rule 7: Prefer public address
1086                  * Note: prefer temprary address if use_tempaddr >= 2
1087                  */
1088                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1089                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1090                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1091                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1092                 break;
1093             }
1094 #endif
1095         case IPV6_SADDR_RULE_ORCHID:
1096                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1097                  *          non-ORCHID vs non-ORCHID
1098                  */
1099                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1100                         ipv6_addr_orchid(dst->addr));
1101                 break;
1102         case IPV6_SADDR_RULE_PREFIX:
1103                 /* Rule 8: Use longest matching prefix */
1104                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1105                                                        dst->addr);
1106                 break;
1107         default:
1108                 ret = 0;
1109         }
1110
1111         if (ret)
1112                 __set_bit(i, score->scorebits);
1113         score->rule = i;
1114 out:
1115         return ret;
1116 }
1117
1118 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1119                        const struct in6_addr *daddr, unsigned int prefs,
1120                        struct in6_addr *saddr)
1121 {
1122         struct ipv6_saddr_score scores[2],
1123                                 *score = &scores[0], *hiscore = &scores[1];
1124         struct ipv6_saddr_dst dst;
1125         struct net_device *dev;
1126         int dst_type;
1127
1128         dst_type = __ipv6_addr_type(daddr);
1129         dst.addr = daddr;
1130         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1131         dst.scope = __ipv6_addr_src_scope(dst_type);
1132         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1133         dst.prefs = prefs;
1134
1135         hiscore->rule = -1;
1136         hiscore->ifa = NULL;
1137
1138         read_lock(&dev_base_lock);
1139         rcu_read_lock();
1140
1141         for_each_netdev(net, dev) {
1142                 struct inet6_dev *idev;
1143
1144                 /* Candidate Source Address (section 4)
1145                  *  - multicast and link-local destination address,
1146                  *    the set of candidate source address MUST only
1147                  *    include addresses assigned to interfaces
1148                  *    belonging to the same link as the outgoing
1149                  *    interface.
1150                  * (- For site-local destination addresses, the
1151                  *    set of candidate source addresses MUST only
1152                  *    include addresses assigned to interfaces
1153                  *    belonging to the same site as the outgoing
1154                  *    interface.)
1155                  */
1156                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1157                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1158                     dst.ifindex && dev->ifindex != dst.ifindex)
1159                         continue;
1160
1161                 idev = __in6_dev_get(dev);
1162                 if (!idev)
1163                         continue;
1164
1165                 read_lock_bh(&idev->lock);
1166                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1167                         int i;
1168
1169                         /*
1170                          * - Tentative Address (RFC2462 section 5.4)
1171                          *  - A tentative address is not considered
1172                          *    "assigned to an interface" in the traditional
1173                          *    sense, unless it is also flagged as optimistic.
1174                          * - Candidate Source Address (section 4)
1175                          *  - In any case, anycast addresses, multicast
1176                          *    addresses, and the unspecified address MUST
1177                          *    NOT be included in a candidate set.
1178                          */
1179                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1180                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1181                                 continue;
1182
1183                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1184
1185                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1186                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1187                                 LIMIT_NETDEBUG(KERN_DEBUG
1188                                                "ADDRCONF: unspecified / multicast address "
1189                                                "assigned as unicast address on %s",
1190                                                dev->name);
1191                                 continue;
1192                         }
1193
1194                         score->rule = -1;
1195                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1196
1197                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1198                                 int minihiscore, miniscore;
1199
1200                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1201                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1202
1203                                 if (minihiscore > miniscore) {
1204                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1205                                             score->scopedist > 0) {
1206                                                 /*
1207                                                  * special case:
1208                                                  * each remaining entry
1209                                                  * has too small (not enough)
1210                                                  * scope, because ifa entries
1211                                                  * are sorted by their scope
1212                                                  * values.
1213                                                  */
1214                                                 goto try_nextdev;
1215                                         }
1216                                         break;
1217                                 } else if (minihiscore < miniscore) {
1218                                         if (hiscore->ifa)
1219                                                 in6_ifa_put(hiscore->ifa);
1220
1221                                         in6_ifa_hold(score->ifa);
1222
1223                                         swap(hiscore, score);
1224
1225                                         /* restore our iterator */
1226                                         score->ifa = hiscore->ifa;
1227
1228                                         break;
1229                                 }
1230                         }
1231                 }
1232 try_nextdev:
1233                 read_unlock_bh(&idev->lock);
1234         }
1235         rcu_read_unlock();
1236         read_unlock(&dev_base_lock);
1237
1238         if (!hiscore->ifa)
1239                 return -EADDRNOTAVAIL;
1240
1241         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242         in6_ifa_put(hiscore->ifa);
1243         return 0;
1244 }
1245
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         if ((idev = __in6_dev_get(dev)) != NULL) {
1256                 struct inet6_ifaddr *ifp;
1257
1258                 read_lock_bh(&idev->lock);
1259                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1260                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1261                                 ipv6_addr_copy(addr, &ifp->addr);
1262                                 err = 0;
1263                                 break;
1264                         }
1265                 }
1266                 read_unlock_bh(&idev->lock);
1267         }
1268         rcu_read_unlock();
1269         return err;
1270 }
1271
1272 static int ipv6_count_addresses(struct inet6_dev *idev)
1273 {
1274         int cnt = 0;
1275         struct inet6_ifaddr *ifp;
1276
1277         read_lock_bh(&idev->lock);
1278         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1279                 cnt++;
1280         read_unlock_bh(&idev->lock);
1281         return cnt;
1282 }
1283
1284 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1285                   struct net_device *dev, int strict)
1286 {
1287         struct inet6_ifaddr * ifp;
1288         u8 hash = ipv6_addr_hash(addr);
1289
1290         read_lock_bh(&addrconf_hash_lock);
1291         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1292                 if (!net_eq(dev_net(ifp->idev->dev), net))
1293                         continue;
1294                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1295                     !(ifp->flags&IFA_F_TENTATIVE)) {
1296                         if (dev == NULL || ifp->idev->dev == dev ||
1297                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1298                                 break;
1299                 }
1300         }
1301         read_unlock_bh(&addrconf_hash_lock);
1302         return ifp != NULL;
1303 }
1304 EXPORT_SYMBOL(ipv6_chk_addr);
1305
1306 static
1307 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1308                        struct net_device *dev)
1309 {
1310         struct inet6_ifaddr * ifp;
1311         u8 hash = ipv6_addr_hash(addr);
1312
1313         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1314                 if (!net_eq(dev_net(ifp->idev->dev), net))
1315                         continue;
1316                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1317                         if (dev == NULL || ifp->idev->dev == dev)
1318                                 break;
1319                 }
1320         }
1321         return ifp != NULL;
1322 }
1323
1324 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1325 {
1326         struct inet6_dev *idev;
1327         struct inet6_ifaddr *ifa;
1328         int     onlink;
1329
1330         onlink = 0;
1331         rcu_read_lock();
1332         idev = __in6_dev_get(dev);
1333         if (idev) {
1334                 read_lock_bh(&idev->lock);
1335                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1336                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1337                                                    ifa->prefix_len);
1338                         if (onlink)
1339                                 break;
1340                 }
1341                 read_unlock_bh(&idev->lock);
1342         }
1343         rcu_read_unlock();
1344         return onlink;
1345 }
1346
1347 EXPORT_SYMBOL(ipv6_chk_prefix);
1348
1349 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1350                                      struct net_device *dev, int strict)
1351 {
1352         struct inet6_ifaddr * ifp;
1353         u8 hash = ipv6_addr_hash(addr);
1354
1355         read_lock_bh(&addrconf_hash_lock);
1356         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1357                 if (!net_eq(dev_net(ifp->idev->dev), net))
1358                         continue;
1359                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1360                         if (dev == NULL || ifp->idev->dev == dev ||
1361                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1362                                 in6_ifa_hold(ifp);
1363                                 break;
1364                         }
1365                 }
1366         }
1367         read_unlock_bh(&addrconf_hash_lock);
1368
1369         return ifp;
1370 }
1371
1372 /* Gets referenced address, destroys ifaddr */
1373
1374 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1375 {
1376         if (ifp->flags&IFA_F_PERMANENT) {
1377                 spin_lock_bh(&ifp->lock);
1378                 addrconf_del_timer(ifp);
1379                 ifp->flags |= IFA_F_TENTATIVE;
1380                 spin_unlock_bh(&ifp->lock);
1381                 in6_ifa_put(ifp);
1382 #ifdef CONFIG_IPV6_PRIVACY
1383         } else if (ifp->flags&IFA_F_TEMPORARY) {
1384                 struct inet6_ifaddr *ifpub;
1385                 spin_lock_bh(&ifp->lock);
1386                 ifpub = ifp->ifpub;
1387                 if (ifpub) {
1388                         in6_ifa_hold(ifpub);
1389                         spin_unlock_bh(&ifp->lock);
1390                         ipv6_create_tempaddr(ifpub, ifp);
1391                         in6_ifa_put(ifpub);
1392                 } else {
1393                         spin_unlock_bh(&ifp->lock);
1394                 }
1395                 ipv6_del_addr(ifp);
1396 #endif
1397         } else
1398                 ipv6_del_addr(ifp);
1399 }
1400
1401 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1402 {
1403         struct inet6_dev *idev = ifp->idev;
1404
1405         if (net_ratelimit())
1406                 printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
1407                         ifp->idev->dev->name);
1408
1409         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1410                 struct in6_addr addr;
1411
1412                 addr.s6_addr32[0] = htonl(0xfe800000);
1413                 addr.s6_addr32[1] = 0;
1414
1415                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1416                     ipv6_addr_equal(&ifp->addr, &addr)) {
1417                         /* DAD failed for link-local based on MAC address */
1418                         idev->cnf.disable_ipv6 = 1;
1419
1420                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1421                                 ifp->idev->dev->name);
1422                 }
1423         }
1424
1425         addrconf_dad_stop(ifp);
1426 }
1427
1428 /* Join to solicited addr multicast group. */
1429
1430 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1431 {
1432         struct in6_addr maddr;
1433
1434         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1435                 return;
1436
1437         addrconf_addr_solict_mult(addr, &maddr);
1438         ipv6_dev_mc_inc(dev, &maddr);
1439 }
1440
1441 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1442 {
1443         struct in6_addr maddr;
1444
1445         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1446                 return;
1447
1448         addrconf_addr_solict_mult(addr, &maddr);
1449         __ipv6_dev_mc_dec(idev, &maddr);
1450 }
1451
1452 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1453 {
1454         struct in6_addr addr;
1455         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1456         if (ipv6_addr_any(&addr))
1457                 return;
1458         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1459 }
1460
1461 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1462 {
1463         struct in6_addr addr;
1464         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1465         if (ipv6_addr_any(&addr))
1466                 return;
1467         __ipv6_dev_ac_dec(ifp->idev, &addr);
1468 }
1469
1470 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1471 {
1472         if (dev->addr_len != ETH_ALEN)
1473                 return -1;
1474         memcpy(eui, dev->dev_addr, 3);
1475         memcpy(eui + 5, dev->dev_addr + 3, 3);
1476
1477         /*
1478          * The zSeries OSA network cards can be shared among various
1479          * OS instances, but the OSA cards have only one MAC address.
1480          * This leads to duplicate address conflicts in conjunction
1481          * with IPv6 if more than one instance uses the same card.
1482          *
1483          * The driver for these cards can deliver a unique 16-bit
1484          * identifier for each instance sharing the same card.  It is
1485          * placed instead of 0xFFFE in the interface identifier.  The
1486          * "u" bit of the interface identifier is not inverted in this
1487          * case.  Hence the resulting interface identifier has local
1488          * scope according to RFC2373.
1489          */
1490         if (dev->dev_id) {
1491                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1492                 eui[4] = dev->dev_id & 0xFF;
1493         } else {
1494                 eui[3] = 0xFF;
1495                 eui[4] = 0xFE;
1496                 eui[0] ^= 2;
1497         }
1498         return 0;
1499 }
1500
1501 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1502 {
1503         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1504         if (dev->addr_len != ARCNET_ALEN)
1505                 return -1;
1506         memset(eui, 0, 7);
1507         eui[7] = *(u8*)dev->dev_addr;
1508         return 0;
1509 }
1510
1511 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1512 {
1513         if (dev->addr_len != INFINIBAND_ALEN)
1514                 return -1;
1515         memcpy(eui, dev->dev_addr + 12, 8);
1516         eui[0] |= 2;
1517         return 0;
1518 }
1519
1520 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1521 {
1522         if (addr == 0)
1523                 return -1;
1524         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1525                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1526                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1527                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1528                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1529                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1530         eui[1] = 0;
1531         eui[2] = 0x5E;
1532         eui[3] = 0xFE;
1533         memcpy(eui + 4, &addr, 4);
1534         return 0;
1535 }
1536 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1537
1538 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1539 {
1540         if (dev->priv_flags & IFF_ISATAP)
1541                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1542         return -1;
1543 }
1544
1545 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1546 {
1547         switch (dev->type) {
1548         case ARPHRD_ETHER:
1549         case ARPHRD_FDDI:
1550         case ARPHRD_IEEE802_TR:
1551                 return addrconf_ifid_eui48(eui, dev);
1552         case ARPHRD_ARCNET:
1553                 return addrconf_ifid_arcnet(eui, dev);
1554         case ARPHRD_INFINIBAND:
1555                 return addrconf_ifid_infiniband(eui, dev);
1556         case ARPHRD_SIT:
1557                 return addrconf_ifid_sit(eui, dev);
1558         }
1559         return -1;
1560 }
1561
1562 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1563 {
1564         int err = -1;
1565         struct inet6_ifaddr *ifp;
1566
1567         read_lock_bh(&idev->lock);
1568         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1569                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1570                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1571                         err = 0;
1572                         break;
1573                 }
1574         }
1575         read_unlock_bh(&idev->lock);
1576         return err;
1577 }
1578
1579 #ifdef CONFIG_IPV6_PRIVACY
1580 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1581 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1582 {
1583 regen:
1584         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1585         idev->rndid[0] &= ~0x02;
1586
1587         /*
1588          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1589          * check if generated address is not inappropriate
1590          *
1591          *  - Reserved subnet anycast (RFC 2526)
1592          *      11111101 11....11 1xxxxxxx
1593          *  - ISATAP (RFC4214) 6.1
1594          *      00-00-5E-FE-xx-xx-xx-xx
1595          *  - value 0
1596          *  - XXX: already assigned to an address on the device
1597          */
1598         if (idev->rndid[0] == 0xfd &&
1599             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1600             (idev->rndid[7]&0x80))
1601                 goto regen;
1602         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1603                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1604                         goto regen;
1605                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1606                         goto regen;
1607         }
1608
1609         return 0;
1610 }
1611
1612 static void ipv6_regen_rndid(unsigned long data)
1613 {
1614         struct inet6_dev *idev = (struct inet6_dev *) data;
1615         unsigned long expires;
1616
1617         rcu_read_lock_bh();
1618         write_lock_bh(&idev->lock);
1619
1620         if (idev->dead)
1621                 goto out;
1622
1623         if (__ipv6_regen_rndid(idev) < 0)
1624                 goto out;
1625
1626         expires = jiffies +
1627                 idev->cnf.temp_prefered_lft * HZ -
1628                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1629         if (time_before(expires, jiffies)) {
1630                 printk(KERN_WARNING
1631                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1632                         idev->dev->name);
1633                 goto out;
1634         }
1635
1636         if (!mod_timer(&idev->regen_timer, expires))
1637                 in6_dev_hold(idev);
1638
1639 out:
1640         write_unlock_bh(&idev->lock);
1641         rcu_read_unlock_bh();
1642         in6_dev_put(idev);
1643 }
1644
1645 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1646         int ret = 0;
1647
1648         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1649                 ret = __ipv6_regen_rndid(idev);
1650         return ret;
1651 }
1652 #endif
1653
1654 /*
1655  *      Add prefix route.
1656  */
1657
1658 static void
1659 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1660                       unsigned long expires, u32 flags)
1661 {
1662         struct fib6_config cfg = {
1663                 .fc_table = RT6_TABLE_PREFIX,
1664                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1665                 .fc_ifindex = dev->ifindex,
1666                 .fc_expires = expires,
1667                 .fc_dst_len = plen,
1668                 .fc_flags = RTF_UP | flags,
1669                 .fc_nlinfo.nl_net = dev_net(dev),
1670                 .fc_protocol = RTPROT_KERNEL,
1671         };
1672
1673         ipv6_addr_copy(&cfg.fc_dst, pfx);
1674
1675         /* Prevent useless cloning on PtP SIT.
1676            This thing is done here expecting that the whole
1677            class of non-broadcast devices need not cloning.
1678          */
1679 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1680         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1681                 cfg.fc_flags |= RTF_NONEXTHOP;
1682 #endif
1683
1684         ip6_route_add(&cfg);
1685 }
1686
1687 /* Create "default" multicast route to the interface */
1688
1689 static void addrconf_add_mroute(struct net_device *dev)
1690 {
1691         struct fib6_config cfg = {
1692                 .fc_table = RT6_TABLE_LOCAL,
1693                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1694                 .fc_ifindex = dev->ifindex,
1695                 .fc_dst_len = 8,
1696                 .fc_flags = RTF_UP,
1697                 .fc_nlinfo.nl_net = dev_net(dev),
1698         };
1699
1700         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1701
1702         ip6_route_add(&cfg);
1703 }
1704
1705 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1706 static void sit_route_add(struct net_device *dev)
1707 {
1708         struct fib6_config cfg = {
1709                 .fc_table = RT6_TABLE_MAIN,
1710                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1711                 .fc_ifindex = dev->ifindex,
1712                 .fc_dst_len = 96,
1713                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1714                 .fc_nlinfo.nl_net = dev_net(dev),
1715         };
1716
1717         /* prefix length - 96 bits "::d.d.d.d" */
1718         ip6_route_add(&cfg);
1719 }
1720 #endif
1721
1722 static void addrconf_add_lroute(struct net_device *dev)
1723 {
1724         struct in6_addr addr;
1725
1726         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1727         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1728 }
1729
1730 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1731 {
1732         struct inet6_dev *idev;
1733
1734         ASSERT_RTNL();
1735
1736         if ((idev = ipv6_find_idev(dev)) == NULL)
1737                 return NULL;
1738
1739         /* Add default multicast route */
1740         addrconf_add_mroute(dev);
1741
1742         /* Add link local route */
1743         addrconf_add_lroute(dev);
1744         return idev;
1745 }
1746
1747 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1748 {
1749         struct prefix_info *pinfo;
1750         __u32 valid_lft;
1751         __u32 prefered_lft;
1752         int addr_type;
1753         struct inet6_dev *in6_dev;
1754         struct net *net = dev_net(dev);
1755
1756         pinfo = (struct prefix_info *) opt;
1757
1758         if (len < sizeof(struct prefix_info)) {
1759                 ADBG(("addrconf: prefix option too short\n"));
1760                 return;
1761         }
1762
1763         /*
1764          *      Validation checks ([ADDRCONF], page 19)
1765          */
1766
1767         addr_type = ipv6_addr_type(&pinfo->prefix);
1768
1769         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1770                 return;
1771
1772         valid_lft = ntohl(pinfo->valid);
1773         prefered_lft = ntohl(pinfo->prefered);
1774
1775         if (prefered_lft > valid_lft) {
1776                 if (net_ratelimit())
1777                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1778                 return;
1779         }
1780
1781         in6_dev = in6_dev_get(dev);
1782
1783         if (in6_dev == NULL) {
1784                 if (net_ratelimit())
1785                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1786                 return;
1787         }
1788
1789         /*
1790          *      Two things going on here:
1791          *      1) Add routes for on-link prefixes
1792          *      2) Configure prefixes with the auto flag set
1793          */
1794
1795         if (pinfo->onlink) {
1796                 struct rt6_info *rt;
1797                 unsigned long rt_expires;
1798
1799                 /* Avoid arithmetic overflow. Really, we could
1800                  * save rt_expires in seconds, likely valid_lft,
1801                  * but it would require division in fib gc, that it
1802                  * not good.
1803                  */
1804                 if (HZ > USER_HZ)
1805                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1806                 else
1807                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1808
1809                 if (addrconf_finite_timeout(rt_expires))
1810                         rt_expires *= HZ;
1811
1812                 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1813                                 dev->ifindex, 1);
1814
1815                 if (rt && addrconf_is_prefix_route(rt)) {
1816                         /* Autoconf prefix route */
1817                         if (valid_lft == 0) {
1818                                 ip6_del_rt(rt);
1819                                 rt = NULL;
1820                         } else if (addrconf_finite_timeout(rt_expires)) {
1821                                 /* not infinity */
1822                                 rt->rt6i_expires = jiffies + rt_expires;
1823                                 rt->rt6i_flags |= RTF_EXPIRES;
1824                         } else {
1825                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1826                                 rt->rt6i_expires = 0;
1827                         }
1828                 } else if (valid_lft) {
1829                         clock_t expires = 0;
1830                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1831                         if (addrconf_finite_timeout(rt_expires)) {
1832                                 /* not infinity */
1833                                 flags |= RTF_EXPIRES;
1834                                 expires = jiffies_to_clock_t(rt_expires);
1835                         }
1836                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1837                                               dev, expires, flags);
1838                 }
1839                 if (rt)
1840                         dst_release(&rt->u.dst);
1841         }
1842
1843         /* Try to figure out our local address for this prefix */
1844
1845         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1846                 struct inet6_ifaddr * ifp;
1847                 struct in6_addr addr;
1848                 int create = 0, update_lft = 0;
1849
1850                 if (pinfo->prefix_len == 64) {
1851                         memcpy(&addr, &pinfo->prefix, 8);
1852                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1853                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1854                                 in6_dev_put(in6_dev);
1855                                 return;
1856                         }
1857                         goto ok;
1858                 }
1859                 if (net_ratelimit())
1860                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1861                                pinfo->prefix_len);
1862                 in6_dev_put(in6_dev);
1863                 return;
1864
1865 ok:
1866
1867                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1868
1869                 if (ifp == NULL && valid_lft) {
1870                         int max_addresses = in6_dev->cnf.max_addresses;
1871                         u32 addr_flags = 0;
1872
1873 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1874                         if (in6_dev->cnf.optimistic_dad &&
1875                             !net->ipv6.devconf_all->forwarding)
1876                                 addr_flags = IFA_F_OPTIMISTIC;
1877 #endif
1878
1879                         /* Do not allow to create too much of autoconfigured
1880                          * addresses; this would be too easy way to crash kernel.
1881                          */
1882                         if (!max_addresses ||
1883                             ipv6_count_addresses(in6_dev) < max_addresses)
1884                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1885                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1886                                                     addr_flags);
1887
1888                         if (!ifp || IS_ERR(ifp)) {
1889                                 in6_dev_put(in6_dev);
1890                                 return;
1891                         }
1892
1893                         update_lft = create = 1;
1894                         ifp->cstamp = jiffies;
1895                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1896                 }
1897
1898                 if (ifp) {
1899                         int flags;
1900                         unsigned long now;
1901 #ifdef CONFIG_IPV6_PRIVACY
1902                         struct inet6_ifaddr *ift;
1903 #endif
1904                         u32 stored_lft;
1905
1906                         /* update lifetime (RFC2462 5.5.3 e) */
1907                         spin_lock(&ifp->lock);
1908                         now = jiffies;
1909                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1910                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1911                         else
1912                                 stored_lft = 0;
1913                         if (!update_lft && stored_lft) {
1914                                 if (valid_lft > MIN_VALID_LIFETIME ||
1915                                     valid_lft > stored_lft)
1916                                         update_lft = 1;
1917                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1918                                         /* valid_lft <= stored_lft is always true */
1919                                         /* XXX: IPsec */
1920                                         update_lft = 0;
1921                                 } else {
1922                                         valid_lft = MIN_VALID_LIFETIME;
1923                                         if (valid_lft < prefered_lft)
1924                                                 prefered_lft = valid_lft;
1925                                         update_lft = 1;
1926                                 }
1927                         }
1928
1929                         if (update_lft) {
1930                                 ifp->valid_lft = valid_lft;
1931                                 ifp->prefered_lft = prefered_lft;
1932                                 ifp->tstamp = now;
1933                                 flags = ifp->flags;
1934                                 ifp->flags &= ~IFA_F_DEPRECATED;
1935                                 spin_unlock(&ifp->lock);
1936
1937                                 if (!(flags&IFA_F_TENTATIVE))
1938                                         ipv6_ifa_notify(0, ifp);
1939                         } else
1940                                 spin_unlock(&ifp->lock);
1941
1942 #ifdef CONFIG_IPV6_PRIVACY
1943                         read_lock_bh(&in6_dev->lock);
1944                         /* update all temporary addresses in the list */
1945                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1946                                 /*
1947                                  * When adjusting the lifetimes of an existing
1948                                  * temporary address, only lower the lifetimes.
1949                                  * Implementations must not increase the
1950                                  * lifetimes of an existing temporary address
1951                                  * when processing a Prefix Information Option.
1952                                  */
1953                                 if (ifp != ift->ifpub)
1954                                         continue;
1955
1956                                 spin_lock(&ift->lock);
1957                                 flags = ift->flags;
1958                                 if (ift->valid_lft > valid_lft &&
1959                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1960                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1961                                 if (ift->prefered_lft > prefered_lft &&
1962                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1963                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1964                                 spin_unlock(&ift->lock);
1965                                 if (!(flags&IFA_F_TENTATIVE))
1966                                         ipv6_ifa_notify(0, ift);
1967                         }
1968
1969                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1970                                 /*
1971                                  * When a new public address is created as described in [ADDRCONF],
1972                                  * also create a new temporary address.
1973                                  */
1974                                 read_unlock_bh(&in6_dev->lock);
1975                                 ipv6_create_tempaddr(ifp, NULL);
1976                         } else {
1977                                 read_unlock_bh(&in6_dev->lock);
1978                         }
1979 #endif
1980                         in6_ifa_put(ifp);
1981                         addrconf_verify(0);
1982                 }
1983         }
1984         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1985         in6_dev_put(in6_dev);
1986 }
1987
1988 /*
1989  *      Set destination address.
1990  *      Special case for SIT interfaces where we create a new "virtual"
1991  *      device.
1992  */
1993 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1994 {
1995         struct in6_ifreq ireq;
1996         struct net_device *dev;
1997         int err = -EINVAL;
1998
1999         rtnl_lock();
2000
2001         err = -EFAULT;
2002         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2003                 goto err_exit;
2004
2005         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2006
2007         err = -ENODEV;
2008         if (dev == NULL)
2009                 goto err_exit;
2010
2011 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2012         if (dev->type == ARPHRD_SIT) {
2013                 const struct net_device_ops *ops = dev->netdev_ops;
2014                 struct ifreq ifr;
2015                 struct ip_tunnel_parm p;
2016
2017                 err = -EADDRNOTAVAIL;
2018                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2019                         goto err_exit;
2020
2021                 memset(&p, 0, sizeof(p));
2022                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2023                 p.iph.saddr = 0;
2024                 p.iph.version = 4;
2025                 p.iph.ihl = 5;
2026                 p.iph.protocol = IPPROTO_IPV6;
2027                 p.iph.ttl = 64;
2028                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2029
2030                 if (ops->ndo_do_ioctl) {
2031                         mm_segment_t oldfs = get_fs();
2032
2033                         set_fs(KERNEL_DS);
2034                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2035                         set_fs(oldfs);
2036                 } else
2037                         err = -EOPNOTSUPP;
2038
2039                 if (err == 0) {
2040                         err = -ENOBUFS;
2041                         dev = __dev_get_by_name(net, p.name);
2042                         if (!dev)
2043                                 goto err_exit;
2044                         err = dev_open(dev);
2045                 }
2046         }
2047 #endif
2048
2049 err_exit:
2050         rtnl_unlock();
2051         return err;
2052 }
2053
2054 /*
2055  *      Manual configuration of address on an interface
2056  */
2057 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2058                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2059                           __u32 valid_lft)
2060 {
2061         struct inet6_ifaddr *ifp;
2062         struct inet6_dev *idev;
2063         struct net_device *dev;
2064         int scope;
2065         u32 flags;
2066         clock_t expires;
2067         unsigned long timeout;
2068
2069         ASSERT_RTNL();
2070
2071         if (plen > 128)
2072                 return -EINVAL;
2073
2074         /* check the lifetime */
2075         if (!valid_lft || prefered_lft > valid_lft)
2076                 return -EINVAL;
2077
2078         dev = __dev_get_by_index(net, ifindex);
2079         if (!dev)
2080                 return -ENODEV;
2081
2082         if ((idev = addrconf_add_dev(dev)) == NULL)
2083                 return -ENOBUFS;
2084
2085         scope = ipv6_addr_scope(pfx);
2086
2087         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2088         if (addrconf_finite_timeout(timeout)) {
2089                 expires = jiffies_to_clock_t(timeout * HZ);
2090                 valid_lft = timeout;
2091                 flags = RTF_EXPIRES;
2092         } else {
2093                 expires = 0;
2094                 flags = 0;
2095                 ifa_flags |= IFA_F_PERMANENT;
2096         }
2097
2098         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2099         if (addrconf_finite_timeout(timeout)) {
2100                 if (timeout == 0)
2101                         ifa_flags |= IFA_F_DEPRECATED;
2102                 prefered_lft = timeout;
2103         }
2104
2105         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2106
2107         if (!IS_ERR(ifp)) {
2108                 spin_lock_bh(&ifp->lock);
2109                 ifp->valid_lft = valid_lft;
2110                 ifp->prefered_lft = prefered_lft;
2111                 ifp->tstamp = jiffies;
2112                 spin_unlock_bh(&ifp->lock);
2113
2114                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2115                                       expires, flags);
2116                 /*
2117                  * Note that section 3.1 of RFC 4429 indicates
2118                  * that the Optimistic flag should not be set for
2119                  * manually configured addresses
2120                  */
2121                 addrconf_dad_start(ifp, 0);
2122                 in6_ifa_put(ifp);
2123                 addrconf_verify(0);
2124                 return 0;
2125         }
2126
2127         return PTR_ERR(ifp);
2128 }
2129
2130 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2131                           unsigned int plen)
2132 {
2133         struct inet6_ifaddr *ifp;
2134         struct inet6_dev *idev;
2135         struct net_device *dev;
2136
2137         if (plen > 128)
2138                 return -EINVAL;
2139
2140         dev = __dev_get_by_index(net, ifindex);
2141         if (!dev)
2142                 return -ENODEV;
2143
2144         if ((idev = __in6_dev_get(dev)) == NULL)
2145                 return -ENXIO;
2146
2147         read_lock_bh(&idev->lock);
2148         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2149                 if (ifp->prefix_len == plen &&
2150                     ipv6_addr_equal(pfx, &ifp->addr)) {
2151                         in6_ifa_hold(ifp);
2152                         read_unlock_bh(&idev->lock);
2153
2154                         ipv6_del_addr(ifp);
2155
2156                         /* If the last address is deleted administratively,
2157                            disable IPv6 on this interface.
2158                          */
2159                         if (idev->addr_list == NULL)
2160                                 addrconf_ifdown(idev->dev, 1);
2161                         return 0;
2162                 }
2163         }
2164         read_unlock_bh(&idev->lock);
2165         return -EADDRNOTAVAIL;
2166 }
2167
2168
2169 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2170 {
2171         struct in6_ifreq ireq;
2172         int err;
2173
2174         if (!capable(CAP_NET_ADMIN))
2175                 return -EPERM;
2176
2177         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2178                 return -EFAULT;
2179
2180         rtnl_lock();
2181         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2182                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2183                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2184         rtnl_unlock();
2185         return err;
2186 }
2187
2188 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2189 {
2190         struct in6_ifreq ireq;
2191         int err;
2192
2193         if (!capable(CAP_NET_ADMIN))
2194                 return -EPERM;
2195
2196         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2197                 return -EFAULT;
2198
2199         rtnl_lock();
2200         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2201                              ireq.ifr6_prefixlen);
2202         rtnl_unlock();
2203         return err;
2204 }
2205
2206 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2207                      int plen, int scope)
2208 {
2209         struct inet6_ifaddr *ifp;
2210
2211         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2212         if (!IS_ERR(ifp)) {
2213                 spin_lock_bh(&ifp->lock);
2214                 ifp->flags &= ~IFA_F_TENTATIVE;
2215                 spin_unlock_bh(&ifp->lock);
2216                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2217                 in6_ifa_put(ifp);
2218         }
2219 }
2220
2221 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2222 static void sit_add_v4_addrs(struct inet6_dev *idev)
2223 {
2224         struct in6_addr addr;
2225         struct net_device *dev;
2226         struct net *net = dev_net(idev->dev);
2227         int scope;
2228
2229         ASSERT_RTNL();
2230
2231         memset(&addr, 0, sizeof(struct in6_addr));
2232         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2233
2234         if (idev->dev->flags&IFF_POINTOPOINT) {
2235                 addr.s6_addr32[0] = htonl(0xfe800000);
2236                 scope = IFA_LINK;
2237         } else {
2238                 scope = IPV6_ADDR_COMPATv4;
2239         }
2240
2241         if (addr.s6_addr32[3]) {
2242                 add_addr(idev, &addr, 128, scope);
2243                 return;
2244         }
2245
2246         for_each_netdev(net, dev) {
2247                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2248                 if (in_dev && (dev->flags & IFF_UP)) {
2249                         struct in_ifaddr * ifa;
2250
2251                         int flag = scope;
2252
2253                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2254                                 int plen;
2255
2256                                 addr.s6_addr32[3] = ifa->ifa_local;
2257
2258                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2259                                         continue;
2260                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2261                                         if (idev->dev->flags&IFF_POINTOPOINT)
2262                                                 continue;
2263                                         flag |= IFA_HOST;
2264                                 }
2265                                 if (idev->dev->flags&IFF_POINTOPOINT)
2266                                         plen = 64;
2267                                 else
2268                                         plen = 96;
2269
2270                                 add_addr(idev, &addr, plen, flag);
2271                         }
2272                 }
2273         }
2274 }
2275 #endif
2276
2277 static void init_loopback(struct net_device *dev)
2278 {
2279         struct inet6_dev  *idev;
2280
2281         /* ::1 */
2282
2283         ASSERT_RTNL();
2284
2285         if ((idev = ipv6_find_idev(dev)) == NULL) {
2286                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2287                 return;
2288         }
2289
2290         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2291 }
2292
2293 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2294 {
2295         struct inet6_ifaddr * ifp;
2296         u32 addr_flags = IFA_F_PERMANENT;
2297
2298 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2299         if (idev->cnf.optimistic_dad &&
2300             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2301                 addr_flags |= IFA_F_OPTIMISTIC;
2302 #endif
2303
2304
2305         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2306         if (!IS_ERR(ifp)) {
2307                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2308                 addrconf_dad_start(ifp, 0);
2309                 in6_ifa_put(ifp);
2310         }
2311 }
2312
2313 static void addrconf_dev_config(struct net_device *dev)
2314 {
2315         struct in6_addr addr;
2316         struct inet6_dev    * idev;
2317
2318         ASSERT_RTNL();
2319
2320         if ((dev->type != ARPHRD_ETHER) &&
2321             (dev->type != ARPHRD_FDDI) &&
2322             (dev->type != ARPHRD_IEEE802_TR) &&
2323             (dev->type != ARPHRD_ARCNET) &&
2324             (dev->type != ARPHRD_INFINIBAND)) {
2325                 /* Alas, we support only Ethernet autoconfiguration. */
2326                 return;
2327         }
2328
2329         idev = addrconf_add_dev(dev);
2330         if (idev == NULL)
2331                 return;
2332
2333         memset(&addr, 0, sizeof(struct in6_addr));
2334         addr.s6_addr32[0] = htonl(0xFE800000);
2335
2336         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2337                 addrconf_add_linklocal(idev, &addr);
2338 }
2339
2340 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2341 static void addrconf_sit_config(struct net_device *dev)
2342 {
2343         struct inet6_dev *idev;
2344
2345         ASSERT_RTNL();
2346
2347         /*
2348          * Configure the tunnel with one of our IPv4
2349          * addresses... we should configure all of
2350          * our v4 addrs in the tunnel
2351          */
2352
2353         if ((idev = ipv6_find_idev(dev)) == NULL) {
2354                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2355                 return;
2356         }
2357
2358         if (dev->priv_flags & IFF_ISATAP) {
2359                 struct in6_addr addr;
2360
2361                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2362                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2363                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2364                         addrconf_add_linklocal(idev, &addr);
2365                 return;
2366         }
2367
2368         sit_add_v4_addrs(idev);
2369
2370         if (dev->flags&IFF_POINTOPOINT) {
2371                 addrconf_add_mroute(dev);
2372                 addrconf_add_lroute(dev);
2373         } else
2374                 sit_route_add(dev);
2375 }
2376 #endif
2377
2378 static inline int
2379 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2380 {
2381         struct in6_addr lladdr;
2382
2383         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2384                 addrconf_add_linklocal(idev, &lladdr);
2385                 return 0;
2386         }
2387         return -1;
2388 }
2389
2390 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2391 {
2392         struct net_device *link_dev;
2393         struct net *net = dev_net(idev->dev);
2394
2395         /* first try to inherit the link-local address from the link device */
2396         if (idev->dev->iflink &&
2397             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2398                 if (!ipv6_inherit_linklocal(idev, link_dev))
2399                         return;
2400         }
2401         /* then try to inherit it from any device */
2402         for_each_netdev(net, link_dev) {
2403                 if (!ipv6_inherit_linklocal(idev, link_dev))
2404                         return;
2405         }
2406         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2407 }
2408
2409 /*
2410  * Autoconfigure tunnel with a link-local address so routing protocols,
2411  * DHCPv6, MLD etc. can be run over the virtual link
2412  */
2413
2414 static void addrconf_ip6_tnl_config(struct net_device *dev)
2415 {
2416         struct inet6_dev *idev;
2417
2418         ASSERT_RTNL();
2419
2420         if ((idev = addrconf_add_dev(dev)) == NULL) {
2421                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2422                 return;
2423         }
2424         ip6_tnl_add_linklocal(idev);
2425 }
2426
2427 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2428                            void * data)
2429 {
2430         struct net_device *dev = (struct net_device *) data;
2431         struct inet6_dev *idev = __in6_dev_get(dev);
2432         int run_pending = 0;
2433         int err;
2434
2435         switch(event) {
2436         case NETDEV_REGISTER:
2437                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2438                         idev = ipv6_add_dev(dev);
2439                         if (!idev)
2440                                 return notifier_from_errno(-ENOMEM);
2441                 }
2442                 break;
2443         case NETDEV_UP:
2444         case NETDEV_CHANGE:
2445                 if (dev->flags & IFF_SLAVE)
2446                         break;
2447
2448                 if (event == NETDEV_UP) {
2449                         if (!addrconf_qdisc_ok(dev)) {
2450                                 /* device is not ready yet. */
2451                                 printk(KERN_INFO
2452                                         "ADDRCONF(NETDEV_UP): %s: "
2453                                         "link is not ready\n",
2454                                         dev->name);
2455                                 break;
2456                         }
2457
2458                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2459                                 idev = ipv6_add_dev(dev);
2460
2461                         if (idev) {
2462                                 idev->if_flags |= IF_READY;
2463                                 run_pending = 1;
2464                         }
2465                 } else {
2466                         if (!addrconf_qdisc_ok(dev)) {
2467                                 /* device is still not ready. */
2468                                 break;
2469                         }
2470
2471                         if (idev) {
2472                                 if (idev->if_flags & IF_READY) {
2473                                         /* device is already configured. */
2474                                         break;
2475                                 }
2476                                 idev->if_flags |= IF_READY;
2477                         }
2478
2479                         printk(KERN_INFO
2480                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2481                                         "link becomes ready\n",
2482                                         dev->name);
2483
2484                         run_pending = 1;
2485                 }
2486
2487                 switch(dev->type) {
2488 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2489                 case ARPHRD_SIT:
2490                         addrconf_sit_config(dev);
2491                         break;
2492 #endif
2493                 case ARPHRD_TUNNEL6:
2494                         addrconf_ip6_tnl_config(dev);
2495                         break;
2496                 case ARPHRD_LOOPBACK:
2497                         init_loopback(dev);
2498                         break;
2499
2500                 default:
2501                         addrconf_dev_config(dev);
2502                         break;
2503                 }
2504                 if (idev) {
2505                         if (run_pending)
2506                                 addrconf_dad_run(idev);
2507
2508                         /* If the MTU changed during the interface down, when the
2509                            interface up, the changed MTU must be reflected in the
2510                            idev as well as routers.
2511                          */
2512                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2513                                 rt6_mtu_change(dev, dev->mtu);
2514                                 idev->cnf.mtu6 = dev->mtu;
2515                         }
2516                         idev->tstamp = jiffies;
2517                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2518                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2519                            stop IPv6 on this interface.
2520                          */
2521                         if (dev->mtu < IPV6_MIN_MTU)
2522                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2523                 }
2524                 break;
2525
2526         case NETDEV_CHANGEMTU:
2527                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2528                         rt6_mtu_change(dev, dev->mtu);
2529                         idev->cnf.mtu6 = dev->mtu;
2530                         break;
2531                 }
2532
2533                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2534                         idev = ipv6_add_dev(dev);
2535                         if (idev)
2536                                 break;
2537                 }
2538
2539                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2540
2541         case NETDEV_DOWN:
2542         case NETDEV_UNREGISTER:
2543                 /*
2544                  *      Remove all addresses from this interface.
2545                  */
2546                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2547                 break;
2548
2549         case NETDEV_CHANGENAME:
2550                 if (idev) {
2551                         snmp6_unregister_dev(idev);
2552                         addrconf_sysctl_unregister(idev);
2553                         addrconf_sysctl_register(idev);
2554                         err = snmp6_register_dev(idev);
2555                         if (err)
2556                                 return notifier_from_errno(err);
2557                 }
2558                 break;
2559         }
2560
2561         return NOTIFY_OK;
2562 }
2563
2564 /*
2565  *      addrconf module should be notified of a device going up
2566  */
2567 static struct notifier_block ipv6_dev_notf = {
2568         .notifier_call = addrconf_notify,
2569         .priority = 0
2570 };
2571
2572 static int addrconf_ifdown(struct net_device *dev, int how)
2573 {
2574         struct inet6_dev *idev;
2575         struct inet6_ifaddr *ifa, **bifa;
2576         struct net *net = dev_net(dev);
2577         int i;
2578
2579         ASSERT_RTNL();
2580
2581         rt6_ifdown(net, dev);
2582         neigh_ifdown(&nd_tbl, dev);
2583
2584         idev = __in6_dev_get(dev);
2585         if (idev == NULL)
2586                 return -ENODEV;
2587
2588         /* Step 1: remove reference to ipv6 device from parent device.
2589                    Do not dev_put!
2590          */
2591         if (how) {
2592                 idev->dead = 1;
2593
2594                 /* protected by rtnl_lock */
2595                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2596
2597                 /* Step 1.5: remove snmp6 entry */
2598                 snmp6_unregister_dev(idev);
2599
2600         }
2601
2602         /* Step 2: clear hash table */
2603         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2604                 bifa = &inet6_addr_lst[i];
2605
2606                 write_lock_bh(&addrconf_hash_lock);
2607                 while ((ifa = *bifa) != NULL) {
2608                         if (ifa->idev == idev) {
2609                                 *bifa = ifa->lst_next;
2610                                 ifa->lst_next = NULL;
2611                                 addrconf_del_timer(ifa);
2612                                 in6_ifa_put(ifa);
2613                                 continue;
2614                         }
2615                         bifa = &ifa->lst_next;
2616                 }
2617                 write_unlock_bh(&addrconf_hash_lock);
2618         }
2619
2620         write_lock_bh(&idev->lock);
2621
2622         /* Step 3: clear flags for stateless addrconf */
2623         if (!how)
2624                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2625
2626         /* Step 4: clear address list */
2627 #ifdef CONFIG_IPV6_PRIVACY
2628         if (how && del_timer(&idev->regen_timer))
2629                 in6_dev_put(idev);
2630
2631         /* clear tempaddr list */
2632         while ((ifa = idev->tempaddr_list) != NULL) {
2633                 idev->tempaddr_list = ifa->tmp_next;
2634                 ifa->tmp_next = NULL;
2635                 ifa->dead = 1;
2636                 write_unlock_bh(&idev->lock);
2637                 spin_lock_bh(&ifa->lock);
2638
2639                 if (ifa->ifpub) {
2640                         in6_ifa_put(ifa->ifpub);
2641                         ifa->ifpub = NULL;
2642                 }
2643                 spin_unlock_bh(&ifa->lock);
2644                 in6_ifa_put(ifa);
2645                 write_lock_bh(&idev->lock);
2646         }
2647 #endif
2648         while ((ifa = idev->addr_list) != NULL) {
2649                 idev->addr_list = ifa->if_next;
2650                 ifa->if_next = NULL;
2651                 ifa->dead = 1;
2652                 addrconf_del_timer(ifa);
2653                 write_unlock_bh(&idev->lock);
2654
2655                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2656                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2657                 in6_ifa_put(ifa);
2658
2659                 write_lock_bh(&idev->lock);
2660         }
2661         write_unlock_bh(&idev->lock);
2662
2663         /* Step 5: Discard multicast list */
2664
2665         if (how)
2666                 ipv6_mc_destroy_dev(idev);
2667         else
2668                 ipv6_mc_down(idev);
2669
2670         idev->tstamp = jiffies;
2671
2672         /* Shot the device (if unregistered) */
2673
2674         if (how) {
2675                 addrconf_sysctl_unregister(idev);
2676                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2677                 neigh_ifdown(&nd_tbl, dev);
2678                 in6_dev_put(idev);
2679         }
2680         return 0;
2681 }
2682
2683 static void addrconf_rs_timer(unsigned long data)
2684 {
2685         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2686
2687         if (ifp->idev->cnf.forwarding)
2688                 goto out;
2689
2690         if (ifp->idev->if_flags & IF_RA_RCVD) {
2691                 /*
2692                  *      Announcement received after solicitation
2693                  *      was sent
2694                  */
2695                 goto out;
2696         }
2697
2698         spin_lock(&ifp->lock);
2699         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2700                 /* The wait after the last probe can be shorter */
2701                 addrconf_mod_timer(ifp, AC_RS,
2702                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2703                                    ifp->idev->cnf.rtr_solicit_delay :
2704                                    ifp->idev->cnf.rtr_solicit_interval);
2705                 spin_unlock(&ifp->lock);
2706
2707                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2708         } else {
2709                 spin_unlock(&ifp->lock);
2710                 /*
2711                  * Note: we do not support deprecated "all on-link"
2712                  * assumption any longer.
2713                  */
2714                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2715                        ifp->idev->dev->name);
2716         }
2717
2718 out:
2719         in6_ifa_put(ifp);
2720 }
2721
2722 /*
2723  *      Duplicate Address Detection
2724  */
2725 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2726 {
2727         unsigned long rand_num;
2728         struct inet6_dev *idev = ifp->idev;
2729
2730         if (ifp->flags & IFA_F_OPTIMISTIC)
2731                 rand_num = 0;
2732         else
2733                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2734
2735         ifp->probes = idev->cnf.dad_transmits;
2736         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2737 }
2738
2739 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2740 {
2741         struct inet6_dev *idev = ifp->idev;
2742         struct net_device *dev = idev->dev;
2743
2744         addrconf_join_solict(dev, &ifp->addr);
2745
2746         net_srandom(ifp->addr.s6_addr32[3]);
2747
2748         read_lock_bh(&idev->lock);
2749         if (ifp->dead)
2750                 goto out;
2751         spin_lock_bh(&ifp->lock);
2752
2753         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2754             idev->cnf.accept_dad < 1 ||
2755             !(ifp->flags&IFA_F_TENTATIVE) ||
2756             ifp->flags & IFA_F_NODAD) {
2757                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2758                 spin_unlock_bh(&ifp->lock);
2759                 read_unlock_bh(&idev->lock);
2760
2761                 addrconf_dad_completed(ifp);
2762                 return;
2763         }
2764
2765         if (!(idev->if_flags & IF_READY)) {
2766                 spin_unlock_bh(&ifp->lock);
2767                 read_unlock_bh(&idev->lock);
2768                 /*
2769                  * If the defice is not ready:
2770                  * - keep it tentative if it is a permanent address.
2771                  * - otherwise, kill it.
2772                  */
2773                 in6_ifa_hold(ifp);
2774                 addrconf_dad_stop(ifp);
2775                 return;
2776         }
2777
2778         /*
2779          * Optimistic nodes can start receiving
2780          * Frames right away
2781          */
2782         if(ifp->flags & IFA_F_OPTIMISTIC)
2783                 ip6_ins_rt(ifp->rt);
2784
2785         addrconf_dad_kick(ifp);
2786         spin_unlock_bh(&ifp->lock);
2787 out:
2788         read_unlock_bh(&idev->lock);
2789 }
2790
2791 static void addrconf_dad_timer(unsigned long data)
2792 {
2793         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2794         struct inet6_dev *idev = ifp->idev;
2795         struct in6_addr mcaddr;
2796
2797         read_lock_bh(&idev->lock);
2798         if (idev->dead) {
2799                 read_unlock_bh(&idev->lock);
2800                 goto out;
2801         }
2802         spin_lock_bh(&ifp->lock);
2803         if (ifp->probes == 0) {
2804                 /*
2805                  * DAD was successful
2806                  */
2807
2808                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2809                 spin_unlock_bh(&ifp->lock);
2810                 read_unlock_bh(&idev->lock);
2811
2812                 addrconf_dad_completed(ifp);
2813
2814                 goto out;
2815         }
2816
2817         ifp->probes--;
2818         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2819         spin_unlock_bh(&ifp->lock);
2820         read_unlock_bh(&idev->lock);
2821
2822         /* send a neighbour solicitation for our addr */
2823         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2824         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2825 out:
2826         in6_ifa_put(ifp);
2827 }
2828
2829 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2830 {
2831         struct net_device *     dev = ifp->idev->dev;
2832
2833         /*
2834          *      Configure the address for reception. Now it is valid.
2835          */
2836
2837         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2838
2839         /* If added prefix is link local and forwarding is off,
2840            start sending router solicitations.
2841          */
2842
2843         if (ifp->idev->cnf.forwarding == 0 &&
2844             ifp->idev->cnf.rtr_solicits > 0 &&
2845             (dev->flags&IFF_LOOPBACK) == 0 &&
2846             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2847                 /*
2848                  *      If a host as already performed a random delay
2849                  *      [...] as part of DAD [...] there is no need
2850                  *      to delay again before sending the first RS
2851                  */
2852                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2853
2854                 spin_lock_bh(&ifp->lock);
2855                 ifp->probes = 1;
2856                 ifp->idev->if_flags |= IF_RS_SENT;
2857                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2858                 spin_unlock_bh(&ifp->lock);
2859         }
2860 }
2861
2862 static void addrconf_dad_run(struct inet6_dev *idev) {
2863         struct inet6_ifaddr *ifp;
2864
2865         read_lock_bh(&idev->lock);
2866         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2867                 spin_lock_bh(&ifp->lock);
2868                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2869                         spin_unlock_bh(&ifp->lock);
2870                         continue;
2871                 }
2872                 spin_unlock_bh(&ifp->lock);
2873                 addrconf_dad_kick(ifp);
2874         }
2875         read_unlock_bh(&idev->lock);
2876 }
2877
2878 #ifdef CONFIG_PROC_FS
2879 struct if6_iter_state {
2880         struct seq_net_private p;
2881         int bucket;
2882 };
2883
2884 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2885 {
2886         struct inet6_ifaddr *ifa = NULL;
2887         struct if6_iter_state *state = seq->private;
2888         struct net *net = seq_file_net(seq);
2889
2890         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2891                 ifa = inet6_addr_lst[state->bucket];
2892
2893                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2894                         ifa = ifa->lst_next;
2895                 if (ifa)
2896                         break;
2897         }
2898         return ifa;
2899 }
2900
2901 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2902 {
2903         struct if6_iter_state *state = seq->private;
2904         struct net *net = seq_file_net(seq);
2905
2906         ifa = ifa->lst_next;
2907 try_again:
2908         if (ifa) {
2909                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2910                         ifa = ifa->lst_next;
2911                         goto try_again;
2912                 }
2913         }
2914
2915         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2916                 ifa = inet6_addr_lst[state->bucket];
2917                 goto try_again;
2918         }
2919
2920         return ifa;
2921 }
2922
2923 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2924 {
2925         struct inet6_ifaddr *ifa = if6_get_first(seq);
2926
2927         if (ifa)
2928                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2929                         --pos;
2930         return pos ? NULL : ifa;
2931 }
2932
2933 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2934         __acquires(addrconf_hash_lock)
2935 {
2936         read_lock_bh(&addrconf_hash_lock);
2937         return if6_get_idx(seq, *pos);
2938 }
2939
2940 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2941 {
2942         struct inet6_ifaddr *ifa;
2943
2944         ifa = if6_get_next(seq, v);
2945         ++*pos;
2946         return ifa;
2947 }
2948
2949 static void if6_seq_stop(struct seq_file *seq, void *v)
2950         __releases(addrconf_hash_lock)
2951 {
2952         read_unlock_bh(&addrconf_hash_lock);
2953 }
2954
2955 static int if6_seq_show(struct seq_file *seq, void *v)
2956 {
2957         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2958         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
2959                    &ifp->addr,
2960                    ifp->idev->dev->ifindex,
2961                    ifp->prefix_len,
2962                    ifp->scope,
2963                    ifp->flags,
2964                    ifp->idev->dev->name);
2965         return 0;
2966 }
2967
2968 static const struct seq_operations if6_seq_ops = {
2969         .start  = if6_seq_start,
2970         .next   = if6_seq_next,
2971         .show   = if6_seq_show,
2972         .stop   = if6_seq_stop,
2973 };
2974
2975 static int if6_seq_open(struct inode *inode, struct file *file)
2976 {
2977         return seq_open_net(inode, file, &if6_seq_ops,
2978                             sizeof(struct if6_iter_state));
2979 }
2980
2981 static const struct file_operations if6_fops = {
2982         .owner          = THIS_MODULE,
2983         .open           = if6_seq_open,
2984         .read           = seq_read,
2985         .llseek         = seq_lseek,
2986         .release        = seq_release_net,
2987 };
2988
2989 static int if6_proc_net_init(struct net *net)
2990 {
2991         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2992                 return -ENOMEM;
2993         return 0;
2994 }
2995
2996 static void if6_proc_net_exit(struct net *net)
2997 {
2998        proc_net_remove(net, "if_inet6");
2999 }
3000
3001 static struct pernet_operations if6_proc_net_ops = {
3002        .init = if6_proc_net_init,
3003        .exit = if6_proc_net_exit,
3004 };
3005
3006 int __init if6_proc_init(void)
3007 {
3008         return register_pernet_subsys(&if6_proc_net_ops);
3009 }
3010
3011 void if6_proc_exit(void)
3012 {
3013         unregister_pernet_subsys(&if6_proc_net_ops);
3014 }
3015 #endif  /* CONFIG_PROC_FS */
3016
3017 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3018 /* Check if address is a home address configured on any interface. */
3019 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3020 {
3021         int ret = 0;
3022         struct inet6_ifaddr * ifp;
3023         u8 hash = ipv6_addr_hash(addr);
3024         read_lock_bh(&addrconf_hash_lock);
3025         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3026                 if (!net_eq(dev_net(ifp->idev->dev), net))
3027                         continue;
3028                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3029                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3030                         ret = 1;
3031                         break;
3032                 }
3033         }
3034         read_unlock_bh(&addrconf_hash_lock);
3035         return ret;
3036 }
3037 #endif
3038
3039 /*
3040  *      Periodic address status verification
3041  */
3042
3043 static void addrconf_verify(unsigned long foo)
3044 {
3045         struct inet6_ifaddr *ifp;
3046         unsigned long now, next;
3047         int i;
3048
3049         spin_lock_bh(&addrconf_verify_lock);
3050         now = jiffies;
3051         next = now + ADDR_CHECK_FREQUENCY;
3052
3053         del_timer(&addr_chk_timer);
3054
3055         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3056
3057 restart:
3058                 read_lock(&addrconf_hash_lock);
3059                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3060                         unsigned long age;
3061 #ifdef CONFIG_IPV6_PRIVACY
3062                         unsigned long regen_advance;
3063 #endif
3064
3065                         if (ifp->flags & IFA_F_PERMANENT)
3066                                 continue;
3067
3068                         spin_lock(&ifp->lock);
3069                         age = (now - ifp->tstamp) / HZ;
3070
3071 #ifdef CONFIG_IPV6_PRIVACY
3072                         regen_advance = ifp->idev->cnf.regen_max_retry *
3073                                         ifp->idev->cnf.dad_transmits *
3074                                         ifp->idev->nd_parms->retrans_time / HZ;
3075 #endif
3076
3077                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3078                             age >= ifp->valid_lft) {
3079                                 spin_unlock(&ifp->lock);
3080                                 in6_ifa_hold(ifp);
3081                                 read_unlock(&addrconf_hash_lock);
3082                                 ipv6_del_addr(ifp);
3083                                 goto restart;
3084                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3085                                 spin_unlock(&ifp->lock);
3086                                 continue;
3087                         } else if (age >= ifp->prefered_lft) {
3088                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3089                                 int deprecate = 0;
3090
3091                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3092                                         deprecate = 1;
3093                                         ifp->flags |= IFA_F_DEPRECATED;
3094                                 }
3095
3096                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3097                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3098
3099                                 spin_unlock(&ifp->lock);
3100
3101                                 if (deprecate) {
3102                                         in6_ifa_hold(ifp);
3103                                         read_unlock(&addrconf_hash_lock);
3104
3105                                         ipv6_ifa_notify(0, ifp);
3106                                         in6_ifa_put(ifp);
3107                                         goto restart;
3108                                 }
3109 #ifdef CONFIG_IPV6_PRIVACY
3110                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3111                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3112                                 if (age >= ifp->prefered_lft - regen_advance) {
3113                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3114                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3115                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3116                                         if (!ifp->regen_count && ifpub) {
3117                                                 ifp->regen_count++;
3118                                                 in6_ifa_hold(ifp);
3119                                                 in6_ifa_hold(ifpub);
3120                                                 spin_unlock(&ifp->lock);
3121                                                 read_unlock(&addrconf_hash_lock);
3122                                                 spin_lock(&ifpub->lock);
3123                                                 ifpub->regen_count = 0;
3124                                                 spin_unlock(&ifpub->lock);
3125                                                 ipv6_create_tempaddr(ifpub, ifp);
3126                                                 in6_ifa_put(ifpub);
3127                                                 in6_ifa_put(ifp);
3128                                                 goto restart;
3129                                         }
3130                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3131                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3132                                 spin_unlock(&ifp->lock);
3133 #endif
3134                         } else {
3135                                 /* ifp->prefered_lft <= ifp->valid_lft */
3136                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3137                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3138                                 spin_unlock(&ifp->lock);
3139                         }
3140                 }
3141                 read_unlock(&addrconf_hash_lock);
3142         }
3143
3144         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3145         add_timer(&addr_chk_timer);
3146         spin_unlock_bh(&addrconf_verify_lock);
3147 }
3148
3149 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3150 {
3151         struct in6_addr *pfx = NULL;
3152
3153         if (addr)
3154                 pfx = nla_data(addr);
3155
3156         if (local) {
3157                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3158                         pfx = NULL;
3159                 else
3160                         pfx = nla_data(local);
3161         }
3162
3163         return pfx;
3164 }
3165
3166 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3167         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3168         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3169         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3170 };
3171
3172 static int
3173 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3174 {
3175         struct net *net = sock_net(skb->sk);
3176         struct ifaddrmsg *ifm;
3177         struct nlattr *tb[IFA_MAX+1];
3178         struct in6_addr *pfx;
3179         int err;
3180
3181         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3182         if (err < 0)
3183                 return err;
3184
3185         ifm = nlmsg_data(nlh);
3186         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3187         if (pfx == NULL)
3188                 return -EINVAL;
3189
3190         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3191 }
3192
3193 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3194                              u32 prefered_lft, u32 valid_lft)
3195 {
3196         u32 flags;
3197         clock_t expires;
3198         unsigned long timeout;
3199
3200         if (!valid_lft || (prefered_lft > valid_lft))
3201                 return -EINVAL;
3202
3203         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3204         if (addrconf_finite_timeout(timeout)) {
3205                 expires = jiffies_to_clock_t(timeout * HZ);
3206                 valid_lft = timeout;
3207                 flags = RTF_EXPIRES;
3208         } else {
3209                 expires = 0;
3210                 flags = 0;
3211                 ifa_flags |= IFA_F_PERMANENT;
3212         }
3213
3214         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3215         if (addrconf_finite_timeout(timeout)) {
3216                 if (timeout == 0)
3217                         ifa_flags |= IFA_F_DEPRECATED;
3218                 prefered_lft = timeout;
3219         }
3220
3221         spin_lock_bh(&ifp->lock);
3222         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3223         ifp->tstamp = jiffies;
3224         ifp->valid_lft = valid_lft;
3225         ifp->prefered_lft = prefered_lft;
3226
3227         spin_unlock_bh(&ifp->lock);
3228         if (!(ifp->flags&IFA_F_TENTATIVE))
3229                 ipv6_ifa_notify(0, ifp);
3230
3231         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3232                               expires, flags);
3233         addrconf_verify(0);
3234
3235         return 0;
3236 }
3237
3238 static int
3239 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3240 {
3241         struct net *net = sock_net(skb->sk);
3242         struct ifaddrmsg *ifm;
3243         struct nlattr *tb[IFA_MAX+1];
3244         struct in6_addr *pfx;
3245         struct inet6_ifaddr *ifa;
3246         struct net_device *dev;
3247         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3248         u8 ifa_flags;
3249         int err;
3250
3251         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3252         if (err < 0)
3253                 return err;
3254
3255         ifm = nlmsg_data(nlh);
3256         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3257         if (pfx == NULL)
3258                 return -EINVAL;
3259
3260         if (tb[IFA_CACHEINFO]) {
3261                 struct ifa_cacheinfo *ci;
3262
3263                 ci = nla_data(tb[IFA_CACHEINFO]);
3264                 valid_lft = ci->ifa_valid;
3265                 preferred_lft = ci->ifa_prefered;
3266         } else {
3267                 preferred_lft = INFINITY_LIFE_TIME;
3268                 valid_lft = INFINITY_LIFE_TIME;
3269         }
3270
3271         dev =  __dev_get_by_index(net, ifm->ifa_index);
3272         if (dev == NULL)
3273                 return -ENODEV;
3274
3275         /* We ignore other flags so far. */
3276         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3277
3278         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3279         if (ifa == NULL) {
3280                 /*
3281                  * It would be best to check for !NLM_F_CREATE here but
3282                  * userspace alreay relies on not having to provide this.
3283                  */
3284                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3285                                       ifm->ifa_prefixlen, ifa_flags,
3286                                       preferred_lft, valid_lft);
3287         }
3288
3289         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3290             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3291                 err = -EEXIST;
3292         else
3293                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3294
3295         in6_ifa_put(ifa);
3296
3297         return err;
3298 }
3299
3300 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3301                           u8 scope, int ifindex)
3302 {
3303         struct ifaddrmsg *ifm;
3304
3305         ifm = nlmsg_data(nlh);
3306         ifm->ifa_family = AF_INET6;
3307         ifm->ifa_prefixlen = prefixlen;
3308         ifm->ifa_flags = flags;
3309         ifm->ifa_scope = scope;
3310         ifm->ifa_index = ifindex;
3311 }
3312
3313 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3314                          unsigned long tstamp, u32 preferred, u32 valid)
3315 {
3316         struct ifa_cacheinfo ci;
3317
3318         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3319                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3320         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3321                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3322         ci.ifa_prefered = preferred;
3323         ci.ifa_valid = valid;
3324
3325         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3326 }
3327
3328 static inline int rt_scope(int ifa_scope)
3329 {
3330         if (ifa_scope & IFA_HOST)
3331                 return RT_SCOPE_HOST;
3332         else if (ifa_scope & IFA_LINK)
3333                 return RT_SCOPE_LINK;
3334         else if (ifa_scope & IFA_SITE)
3335                 return RT_SCOPE_SITE;
3336         else
3337                 return RT_SCOPE_UNIVERSE;
3338 }
3339
3340 static inline int inet6_ifaddr_msgsize(void)
3341 {
3342         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3343                + nla_total_size(16) /* IFA_ADDRESS */
3344                + nla_total_size(sizeof(struct ifa_cacheinfo));
3345 }
3346
3347 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3348                              u32 pid, u32 seq, int event, unsigned int flags)
3349 {
3350         struct nlmsghdr  *nlh;
3351         u32 preferred, valid;
3352
3353         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3354         if (nlh == NULL)
3355                 return -EMSGSIZE;
3356
3357         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3358                       ifa->idev->dev->ifindex);
3359
3360         if (!(ifa->flags&IFA_F_PERMANENT)) {
3361                 preferred = ifa->prefered_lft;
3362                 valid = ifa->valid_lft;
3363                 if (preferred != INFINITY_LIFE_TIME) {
3364                         long tval = (jiffies - ifa->tstamp)/HZ;
3365                         preferred -= tval;
3366                         if (valid != INFINITY_LIFE_TIME)
3367                                 valid -= tval;
3368                 }
3369         } else {
3370                 preferred = INFINITY_LIFE_TIME;
3371                 valid = INFINITY_LIFE_TIME;
3372         }
3373
3374         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3375             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3376                 nlmsg_cancel(skb, nlh);
3377                 return -EMSGSIZE;
3378         }
3379
3380         return nlmsg_end(skb, nlh);
3381 }
3382
3383 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3384                                 u32 pid, u32 seq, int event, u16 flags)
3385 {
3386         struct nlmsghdr  *nlh;
3387         u8 scope = RT_SCOPE_UNIVERSE;
3388         int ifindex = ifmca->idev->dev->ifindex;
3389
3390         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3391                 scope = RT_SCOPE_SITE;
3392
3393         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3394         if (nlh == NULL)
3395                 return -EMSGSIZE;
3396
3397         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3398         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3399             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3400                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3401                 nlmsg_cancel(skb, nlh);
3402                 return -EMSGSIZE;
3403         }
3404
3405         return nlmsg_end(skb, nlh);
3406 }
3407
3408 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3409                                 u32 pid, u32 seq, int event, unsigned int flags)
3410 {
3411         struct nlmsghdr  *nlh;
3412         u8 scope = RT_SCOPE_UNIVERSE;
3413         int ifindex = ifaca->aca_idev->dev->ifindex;
3414
3415         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3416                 scope = RT_SCOPE_SITE;
3417
3418         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3419         if (nlh == NULL)
3420                 return -EMSGSIZE;
3421
3422         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3423         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3424             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3425                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3426                 nlmsg_cancel(skb, nlh);
3427                 return -EMSGSIZE;
3428         }
3429
3430         return nlmsg_end(skb, nlh);
3431 }
3432
3433 enum addr_type_t
3434 {
3435         UNICAST_ADDR,
3436         MULTICAST_ADDR,
3437         ANYCAST_ADDR,
3438 };
3439
3440 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3441                            enum addr_type_t type)
3442 {
3443         int idx, ip_idx;
3444         int s_idx, s_ip_idx;
3445         int err = 1;
3446         struct net_device *dev;
3447         struct inet6_dev *idev = NULL;
3448         struct inet6_ifaddr *ifa;
3449         struct ifmcaddr6 *ifmca;
3450         struct ifacaddr6 *ifaca;
3451         struct net *net = sock_net(skb->sk);
3452
3453         s_idx = cb->args[0];
3454         s_ip_idx = ip_idx = cb->args[1];
3455
3456         idx = 0;
3457         for_each_netdev(net, dev) {
3458                 if (idx < s_idx)
3459                         goto cont;
3460                 if (idx > s_idx)
3461                         s_ip_idx = 0;
3462                 ip_idx = 0;
3463                 if ((idev = in6_dev_get(dev)) == NULL)
3464                         goto cont;
3465                 read_lock_bh(&idev->lock);
3466                 switch (type) {
3467                 case UNICAST_ADDR:
3468                         /* unicast address incl. temp addr */
3469                         for (ifa = idev->addr_list; ifa;
3470                              ifa = ifa->if_next, ip_idx++) {
3471                                 if (ip_idx < s_ip_idx)
3472                                         continue;
3473                                 err = inet6_fill_ifaddr(skb, ifa,
3474                                                         NETLINK_CB(cb->skb).pid,
3475                                                         cb->nlh->nlmsg_seq,
3476                                                         RTM_NEWADDR,
3477                                                         NLM_F_MULTI);
3478                         }
3479                         break;
3480                 case MULTICAST_ADDR:
3481                         /* multicast address */
3482                         for (ifmca = idev->mc_list; ifmca;
3483                              ifmca = ifmca->next, ip_idx++) {
3484                                 if (ip_idx < s_ip_idx)
3485                                         continue;
3486                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3487                                                           NETLINK_CB(cb->skb).pid,
3488                                                           cb->nlh->nlmsg_seq,
3489                                                           RTM_GETMULTICAST,
3490                                                           NLM_F_MULTI);
3491                         }
3492                         break;
3493                 case ANYCAST_ADDR:
3494                         /* anycast address */
3495                         for (ifaca = idev->ac_list; ifaca;
3496                              ifaca = ifaca->aca_next, ip_idx++) {
3497                                 if (ip_idx < s_ip_idx)
3498                                         continue;
3499                                 err = inet6_fill_ifacaddr(skb, ifaca,
3500                                                           NETLINK_CB(cb->skb).pid,
3501                                                           cb->nlh->nlmsg_seq,
3502                                                           RTM_GETANYCAST,
3503                                                           NLM_F_MULTI);
3504                         }
3505                         break;
3506                 default:
3507                         break;
3508                 }
3509                 read_unlock_bh(&idev->lock);
3510                 in6_dev_put(idev);
3511
3512                 if (err <= 0)
3513                         break;
3514 cont:
3515                 idx++;
3516         }
3517         cb->args[0] = idx;
3518         cb->args[1] = ip_idx;
3519         return skb->len;
3520 }
3521
3522 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3523 {
3524         enum addr_type_t type = UNICAST_ADDR;
3525
3526         return inet6_dump_addr(skb, cb, type);
3527 }
3528
3529 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3530 {
3531         enum addr_type_t type = MULTICAST_ADDR;
3532
3533         return inet6_dump_addr(skb, cb, type);
3534 }
3535
3536
3537 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3538 {
3539         enum addr_type_t type = ANYCAST_ADDR;
3540
3541         return inet6_dump_addr(skb, cb, type);
3542 }
3543
3544 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3545                              void *arg)
3546 {
3547         struct net *net = sock_net(in_skb->sk);
3548         struct ifaddrmsg *ifm;
3549         struct nlattr *tb[IFA_MAX+1];
3550         struct in6_addr *addr = NULL;
3551         struct net_device *dev = NULL;
3552         struct inet6_ifaddr *ifa;
3553         struct sk_buff *skb;
3554         int err;
3555
3556         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3557         if (err < 0)
3558                 goto errout;
3559
3560         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3561         if (addr == NULL) {
3562                 err = -EINVAL;
3563                 goto errout;
3564         }
3565
3566         ifm = nlmsg_data(nlh);
3567         if (ifm->ifa_index)
3568                 dev = __dev_get_by_index(net, ifm->ifa_index);
3569
3570         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3571                 err = -EADDRNOTAVAIL;
3572                 goto errout;
3573         }
3574
3575         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3576                 err = -ENOBUFS;
3577                 goto errout_ifa;
3578         }
3579
3580         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3581                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3582         if (err < 0) {
3583                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3584                 WARN_ON(err == -EMSGSIZE);
3585                 kfree_skb(skb);
3586                 goto errout_ifa;
3587         }
3588         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3589 errout_ifa:
3590         in6_ifa_put(ifa);
3591 errout:
3592         return err;
3593 }
3594
3595 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3596 {
3597         struct sk_buff *skb;
3598         struct net *net = dev_net(ifa->idev->dev);
3599         int err = -ENOBUFS;
3600
3601         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3602         if (skb == NULL)
3603                 goto errout;
3604
3605         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3606         if (err < 0) {
3607                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3608                 WARN_ON(err == -EMSGSIZE);
3609                 kfree_skb(skb);
3610                 goto errout;
3611         }
3612         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3613         return;
3614 errout:
3615         if (err < 0)
3616                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3617 }
3618
3619 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3620                                 __s32 *array, int bytes)
3621 {
3622         BUG_ON(bytes < (DEVCONF_MAX * 4));
3623
3624         memset(array, 0, bytes);
3625         array[DEVCONF_FORWARDING] = cnf->forwarding;
3626         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3627         array[DEVCONF_MTU6] = cnf->mtu6;
3628         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3629         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3630         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3631         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3632         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3633         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3634         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3635         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3636 #ifdef CONFIG_IPV6_PRIVACY
3637         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3638         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3639         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3640         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3641         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3642 #endif
3643         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3644         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3645         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3646 #ifdef CONFIG_IPV6_ROUTER_PREF
3647         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3648         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3649 #ifdef CONFIG_IPV6_ROUTE_INFO
3650         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3651 #endif
3652 #endif
3653         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3654         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3655 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3656         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3657 #endif
3658 #ifdef CONFIG_IPV6_MROUTE
3659         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3660 #endif
3661         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3662         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3663 }
3664
3665 static inline size_t inet6_if_nlmsg_size(void)
3666 {
3667         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3668                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3669                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3670                + nla_total_size(4) /* IFLA_MTU */
3671                + nla_total_size(4) /* IFLA_LINK */
3672                + nla_total_size( /* IFLA_PROTINFO */
3673                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3674                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3675                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3676                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3677                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3678                  );
3679 }
3680
3681 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3682                                       int bytes)
3683 {
3684         int i;
3685         int pad = bytes - sizeof(u64) * items;
3686         BUG_ON(pad < 0);
3687
3688         /* Use put_unaligned() because stats may not be aligned for u64. */
3689         put_unaligned(items, &stats[0]);
3690         for (i = 1; i < items; i++)
3691                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3692
3693         memset(&stats[items], 0, pad);
3694 }
3695
3696 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3697                              int bytes)
3698 {
3699         switch(attrtype) {
3700         case IFLA_INET6_STATS:
3701                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3702                 break;
3703         case IFLA_INET6_ICMP6STATS:
3704                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3705                 break;
3706         }
3707 }
3708
3709 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3710                              u32 pid, u32 seq, int event, unsigned int flags)
3711 {
3712         struct net_device *dev = idev->dev;
3713         struct nlattr *nla;
3714         struct ifinfomsg *hdr;
3715         struct nlmsghdr *nlh;
3716         void *protoinfo;
3717         struct ifla_cacheinfo ci;
3718
3719         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3720         if (nlh == NULL)
3721                 return -EMSGSIZE;
3722
3723         hdr = nlmsg_data(nlh);
3724         hdr->ifi_family = AF_INET6;
3725         hdr->__ifi_pad = 0;
3726         hdr->ifi_type = dev->type;
3727         hdr->ifi_index = dev->ifindex;
3728         hdr->ifi_flags = dev_get_flags(dev);
3729         hdr->ifi_change = 0;
3730
3731         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3732
3733         if (dev->addr_len)
3734                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3735
3736         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3737         if (dev->ifindex != dev->iflink)
3738                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3739
3740         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3741         if (protoinfo == NULL)
3742                 goto nla_put_failure;
3743
3744         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3745
3746         ci.max_reasm_len = IPV6_MAXPLEN;
3747         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3748                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3749         ci.reachable_time = idev->nd_parms->reachable_time;
3750         ci.retrans_time = idev->nd_parms->retrans_time;
3751         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3752
3753         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3754         if (nla == NULL)
3755                 goto nla_put_failure;
3756         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3757
3758         /* XXX - MC not implemented */
3759
3760         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3761         if (nla == NULL)
3762                 goto nla_put_failure;
3763         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3764
3765         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3766         if (nla == NULL)
3767                 goto nla_put_failure;
3768         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3769
3770         nla_nest_end(skb, protoinfo);
3771         return nlmsg_end(skb, nlh);
3772
3773 nla_put_failure:
3774         nlmsg_cancel(skb, nlh);
3775         return -EMSGSIZE;
3776 }
3777
3778 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3779 {
3780         struct net *net = sock_net(skb->sk);
3781         int idx, err;
3782         int s_idx = cb->args[0];
3783         struct net_device *dev;
3784         struct inet6_dev *idev;
3785
3786         read_lock(&dev_base_lock);
3787         idx = 0;
3788         for_each_netdev(net, dev) {
3789                 if (idx < s_idx)
3790                         goto cont;
3791                 if ((idev = in6_dev_get(dev)) == NULL)
3792                         goto cont;
3793                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3794                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3795                 in6_dev_put(idev);
3796                 if (err <= 0)
3797                         break;
3798 cont:
3799                 idx++;
3800         }
3801         read_unlock(&dev_base_lock);
3802         cb->args[0] = idx;
3803
3804         return skb->len;
3805 }
3806
3807 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3808 {
3809         struct sk_buff *skb;
3810         struct net *net = dev_net(idev->dev);
3811         int err = -ENOBUFS;
3812
3813         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3814         if (skb == NULL)
3815                 goto errout;
3816
3817         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3818         if (err < 0) {
3819                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3820                 WARN_ON(err == -EMSGSIZE);
3821                 kfree_skb(skb);
3822                 goto errout;
3823         }
3824         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3825         return;
3826 errout:
3827         if (err < 0)
3828                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3829 }
3830
3831 static inline size_t inet6_prefix_nlmsg_size(void)
3832 {
3833         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3834                + nla_total_size(sizeof(struct in6_addr))
3835                + nla_total_size(sizeof(struct prefix_cacheinfo));
3836 }
3837
3838 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3839                              struct prefix_info *pinfo, u32 pid, u32 seq,
3840                              int event, unsigned int flags)
3841 {
3842         struct prefixmsg *pmsg;
3843         struct nlmsghdr *nlh;
3844         struct prefix_cacheinfo ci;
3845
3846         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3847         if (nlh == NULL)
3848                 return -EMSGSIZE;
3849
3850         pmsg = nlmsg_data(nlh);
3851         pmsg->prefix_family = AF_INET6;
3852         pmsg->prefix_pad1 = 0;
3853         pmsg->prefix_pad2 = 0;
3854         pmsg->prefix_ifindex = idev->dev->ifindex;
3855         pmsg->prefix_len = pinfo->prefix_len;
3856         pmsg->prefix_type = pinfo->type;
3857         pmsg->prefix_pad3 = 0;
3858         pmsg->prefix_flags = 0;
3859         if (pinfo->onlink)
3860                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3861         if (pinfo->autoconf)
3862                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3863
3864         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3865
3866         ci.preferred_time = ntohl(pinfo->prefered);
3867         ci.valid_time = ntohl(pinfo->valid);
3868         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3869
3870         return nlmsg_end(skb, nlh);
3871
3872 nla_put_failure:
3873         nlmsg_cancel(skb, nlh);
3874         return -EMSGSIZE;
3875 }
3876
3877 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3878                          struct prefix_info *pinfo)
3879 {
3880         struct sk_buff *skb;
3881         struct net *net = dev_net(idev->dev);
3882         int err = -ENOBUFS;
3883
3884         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3885         if (skb == NULL)
3886                 goto errout;
3887
3888         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3889         if (err < 0) {
3890                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3891                 WARN_ON(err == -EMSGSIZE);
3892                 kfree_skb(skb);
3893                 goto errout;
3894         }
3895         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3896         return;
3897 errout:
3898         if (err < 0)
3899                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3900 }
3901
3902 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3903 {
3904         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3905
3906         switch (event) {
3907         case RTM_NEWADDR:
3908                 /*
3909                  * If the address was optimistic
3910                  * we inserted the route at the start of
3911                  * our DAD process, so we don't need
3912                  * to do it again
3913                  */
3914                 if (!(ifp->rt->rt6i_node))
3915                         ip6_ins_rt(ifp->rt);
3916                 if (ifp->idev->cnf.forwarding)
3917                         addrconf_join_anycast(ifp);
3918                 break;
3919         case RTM_DELADDR:
3920                 if (ifp->idev->cnf.forwarding)
3921                         addrconf_leave_anycast(ifp);
3922                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3923                 dst_hold(&ifp->rt->u.dst);
3924                 if (ip6_del_rt(ifp->rt))
3925                         dst_free(&ifp->rt->u.dst);
3926                 break;
3927         }
3928 }
3929
3930 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3931 {
3932         rcu_read_lock_bh();
3933         if (likely(ifp->idev->dead == 0))
3934                 __ipv6_ifa_notify(event, ifp);
3935         rcu_read_unlock_bh();
3936 }
3937
3938 #ifdef CONFIG_SYSCTL
3939
3940 static
3941 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3942                            void __user *buffer, size_t *lenp, loff_t *ppos)
3943 {
3944         int *valp = ctl->data;
3945         int val = *valp;
3946         int ret;
3947
3948         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3949
3950         if (write)
3951                 ret = addrconf_fixup_forwarding(ctl, valp, val);
3952         return ret;
3953 }
3954
3955 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3956                                             void __user *oldval,
3957                                             size_t __user *oldlenp,
3958                                             void __user *newval, size_t newlen)
3959 {
3960         int *valp = table->data;
3961         int val = *valp;
3962         int new;
3963
3964         if (!newval || !newlen)
3965                 return 0;
3966         if (newlen != sizeof(int))
3967                 return -EINVAL;
3968         if (get_user(new, (int __user *)newval))
3969                 return -EFAULT;
3970         if (new == *valp)
3971                 return 0;
3972         if (oldval && oldlenp) {
3973                 size_t len;
3974                 if (get_user(len, oldlenp))
3975                         return -EFAULT;
3976                 if (len) {
3977                         if (len > table->maxlen)
3978                                 len = table->maxlen;
3979                         if (copy_to_user(oldval, valp, len))
3980                                 return -EFAULT;
3981                         if (put_user(len, oldlenp))
3982                                 return -EFAULT;
3983                 }
3984         }
3985
3986         *valp = new;
3987         return addrconf_fixup_forwarding(table, valp, val);
3988 }
3989
3990 static void dev_disable_change(struct inet6_dev *idev)
3991 {
3992         if (!idev || !idev->dev)
3993                 return;
3994
3995         if (idev->cnf.disable_ipv6)
3996                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
3997         else
3998                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
3999 }
4000
4001 static void addrconf_disable_change(struct net *net, __s32 newf)
4002 {
4003         struct net_device *dev;
4004         struct inet6_dev *idev;
4005
4006         read_lock(&dev_base_lock);
4007         for_each_netdev(net, dev) {
4008                 rcu_read_lock();
4009                 idev = __in6_dev_get(dev);
4010                 if (idev) {
4011                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4012                         idev->cnf.disable_ipv6 = newf;
4013                         if (changed)
4014                                 dev_disable_change(idev);
4015                 }
4016                 rcu_read_unlock();
4017         }
4018         read_unlock(&dev_base_lock);
4019 }
4020
4021 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4022 {
4023         struct net *net;
4024
4025         net = (struct net *)table->extra2;
4026
4027         if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4028                 return 0;
4029
4030         if (!rtnl_trylock())
4031                 return restart_syscall();
4032
4033         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4034                 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4035                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4036                 addrconf_disable_change(net, newf);
4037         } else if ((!*p) ^ (!old))
4038                 dev_disable_change((struct inet6_dev *)table->extra1);
4039
4040         rtnl_unlock();
4041         return 0;
4042 }
4043
4044 static
4045 int addrconf_sysctl_disable(ctl_table *ctl, int write, struct file * filp,
4046                             void __user *buffer, size_t *lenp, loff_t *ppos)
4047 {
4048         int *valp = ctl->data;
4049         int val = *valp;
4050         int ret;
4051
4052         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
4053
4054         if (write)
4055                 ret = addrconf_disable_ipv6(ctl, valp, val);
4056         return ret;
4057 }
4058
4059 static struct addrconf_sysctl_table
4060 {
4061         struct ctl_table_header *sysctl_header;
4062         ctl_table addrconf_vars[DEVCONF_MAX+1];
4063         char *dev_name;
4064 } addrconf_sysctl __read_mostly = {
4065         .sysctl_header = NULL,
4066         .addrconf_vars = {
4067                 {
4068                         .ctl_name       =       NET_IPV6_FORWARDING,
4069                         .procname       =       "forwarding",
4070                         .data           =       &ipv6_devconf.forwarding,
4071                         .maxlen         =       sizeof(int),
4072                         .mode           =       0644,
4073                         .proc_handler   =       addrconf_sysctl_forward,
4074                         .strategy       =       addrconf_sysctl_forward_strategy,
4075                 },
4076                 {
4077                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
4078                         .procname       =       "hop_limit",
4079                         .data           =       &ipv6_devconf.hop_limit,
4080                         .maxlen         =       sizeof(int),
4081                         .mode           =       0644,
4082                         .proc_handler   =       proc_dointvec,
4083                 },
4084                 {
4085                         .ctl_name       =       NET_IPV6_MTU,
4086                         .procname       =       "mtu",
4087                         .data           =       &ipv6_devconf.mtu6,
4088                         .maxlen         =       sizeof(int),
4089                         .mode           =       0644,
4090                         .proc_handler   =       proc_dointvec,
4091                 },
4092                 {
4093                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
4094                         .procname       =       "accept_ra",
4095                         .data           =       &ipv6_devconf.accept_ra,
4096                         .maxlen         =       sizeof(int),
4097                         .mode           =       0644,
4098                         .proc_handler   =       proc_dointvec,
4099                 },
4100                 {
4101                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
4102                         .procname       =       "accept_redirects",
4103                         .data           =       &ipv6_devconf.accept_redirects,
4104                         .maxlen         =       sizeof(int),
4105                         .mode           =       0644,
4106                         .proc_handler   =       proc_dointvec,
4107                 },
4108                 {
4109                         .ctl_name       =       NET_IPV6_AUTOCONF,
4110                         .procname       =       "autoconf",
4111                         .data           =       &ipv6_devconf.autoconf,
4112                         .maxlen         =       sizeof(int),
4113                         .mode           =       0644,
4114                         .proc_handler   =       proc_dointvec,
4115                 },
4116                 {
4117                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
4118                         .procname       =       "dad_transmits",
4119                         .data           =       &ipv6_devconf.dad_transmits,
4120                         .maxlen         =       sizeof(int),
4121                         .mode           =       0644,
4122                         .proc_handler   =       proc_dointvec,
4123                 },
4124                 {
4125                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
4126                         .procname       =       "router_solicitations",
4127                         .data           =       &ipv6_devconf.rtr_solicits,
4128                         .maxlen         =       sizeof(int),
4129                         .mode           =       0644,
4130                         .proc_handler   =       proc_dointvec,
4131                 },
4132                 {
4133                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
4134                         .procname       =       "router_solicitation_interval",
4135                         .data           =       &ipv6_devconf.rtr_solicit_interval,
4136                         .maxlen         =       sizeof(int),
4137                         .mode           =       0644,
4138                         .proc_handler   =       proc_dointvec_jiffies,
4139                         .strategy       =       sysctl_jiffies,
4140                 },
4141                 {
4142                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
4143                         .procname       =       "router_solicitation_delay",
4144                         .data           =       &ipv6_devconf.rtr_solicit_delay,
4145                         .maxlen         =       sizeof(int),
4146                         .mode           =       0644,
4147                         .proc_handler   =       proc_dointvec_jiffies,
4148                         .strategy       =       sysctl_jiffies,
4149                 },
4150                 {
4151                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
4152                         .procname       =       "force_mld_version",
4153                         .data           =       &ipv6_devconf.force_mld_version,
4154                         .maxlen         =       sizeof(int),
4155                         .mode           =       0644,
4156                         .proc_handler   =       proc_dointvec,
4157                 },
4158 #ifdef CONFIG_IPV6_PRIVACY
4159                 {
4160                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
4161                         .procname       =       "use_tempaddr",
4162                         .data           =       &ipv6_devconf.use_tempaddr,
4163                         .maxlen         =       sizeof(int),
4164                         .mode           =       0644,
4165                         .proc_handler   =       proc_dointvec,
4166                 },
4167                 {
4168                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
4169                         .procname       =       "temp_valid_lft",
4170                         .data           =       &ipv6_devconf.temp_valid_lft,
4171                         .maxlen         =       sizeof(int),
4172                         .mode           =       0644,
4173                         .proc_handler   =       proc_dointvec,
4174                 },
4175                 {
4176                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4177                         .procname       =       "temp_prefered_lft",
4178                         .data           =       &ipv6_devconf.temp_prefered_lft,
4179                         .maxlen         =       sizeof(int),
4180                         .mode           =       0644,
4181                         .proc_handler   =       proc_dointvec,
4182                 },
4183                 {
4184                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4185                         .procname       =       "regen_max_retry",
4186                         .data           =       &ipv6_devconf.regen_max_retry,
4187                         .maxlen         =       sizeof(int),
4188                         .mode           =       0644,
4189                         .proc_handler   =       proc_dointvec,
4190                 },
4191                 {
4192                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4193                         .procname       =       "max_desync_factor",
4194                         .data           =       &ipv6_devconf.max_desync_factor,
4195                         .maxlen         =       sizeof(int),
4196                         .mode           =       0644,
4197                         .proc_handler   =       proc_dointvec,
4198                 },
4199 #endif
4200                 {
4201                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4202                         .procname       =       "max_addresses",
4203                         .data           =       &ipv6_devconf.max_addresses,
4204                         .maxlen         =       sizeof(int),
4205                         .mode           =       0644,
4206                         .proc_handler   =       proc_dointvec,
4207                 },
4208                 {
4209                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4210                         .procname       =       "accept_ra_defrtr",
4211                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4212                         .maxlen         =       sizeof(int),
4213                         .mode           =       0644,
4214                         .proc_handler   =       proc_dointvec,
4215                 },
4216                 {
4217                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4218                         .procname       =       "accept_ra_pinfo",
4219                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4220                         .maxlen         =       sizeof(int),
4221                         .mode           =       0644,
4222                         .proc_handler   =       proc_dointvec,
4223                 },
4224 #ifdef CONFIG_IPV6_ROUTER_PREF
4225                 {
4226                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4227                         .procname       =       "accept_ra_rtr_pref",
4228                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4229                         .maxlen         =       sizeof(int),
4230                         .mode           =       0644,
4231                         .proc_handler   =       proc_dointvec,
4232                 },
4233                 {
4234                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4235                         .procname       =       "router_probe_interval",
4236                         .data           =       &ipv6_devconf.rtr_probe_interval,
4237                         .maxlen         =       sizeof(int),
4238                         .mode           =       0644,
4239                         .proc_handler   =       proc_dointvec_jiffies,
4240                         .strategy       =       sysctl_jiffies,
4241                 },
4242 #ifdef CONFIG_IPV6_ROUTE_INFO
4243                 {
4244                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4245                         .procname       =       "accept_ra_rt_info_max_plen",
4246                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4247                         .maxlen         =       sizeof(int),
4248                         .mode           =       0644,
4249                         .proc_handler   =       proc_dointvec,
4250                 },
4251 #endif
4252 #endif
4253                 {
4254                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4255                         .procname       =       "proxy_ndp",
4256                         .data           =       &ipv6_devconf.proxy_ndp,
4257                         .maxlen         =       sizeof(int),
4258                         .mode           =       0644,
4259                         .proc_handler   =       proc_dointvec,
4260                 },
4261                 {
4262                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4263                         .procname       =       "accept_source_route",
4264                         .data           =       &ipv6_devconf.accept_source_route,
4265                         .maxlen         =       sizeof(int),
4266                         .mode           =       0644,
4267                         .proc_handler   =       proc_dointvec,
4268                 },
4269 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4270                 {
4271                         .ctl_name       =       CTL_UNNUMBERED,
4272                         .procname       =       "optimistic_dad",
4273                         .data           =       &ipv6_devconf.optimistic_dad,
4274                         .maxlen         =       sizeof(int),
4275                         .mode           =       0644,
4276                         .proc_handler   =       proc_dointvec,
4277
4278                 },
4279 #endif
4280 #ifdef CONFIG_IPV6_MROUTE
4281                 {
4282                         .ctl_name       =       CTL_UNNUMBERED,
4283                         .procname       =       "mc_forwarding",
4284                         .data           =       &ipv6_devconf.mc_forwarding,
4285                         .maxlen         =       sizeof(int),
4286                         .mode           =       0444,
4287                         .proc_handler   =       proc_dointvec,
4288                 },
4289 #endif
4290                 {
4291                         .ctl_name       =       CTL_UNNUMBERED,
4292                         .procname       =       "disable_ipv6",
4293                         .data           =       &ipv6_devconf.disable_ipv6,
4294                         .maxlen         =       sizeof(int),
4295                         .mode           =       0644,
4296                         .proc_handler   =       addrconf_sysctl_disable,
4297                         .strategy       =       sysctl_intvec,
4298                 },
4299                 {
4300                         .ctl_name       =       CTL_UNNUMBERED,
4301                         .procname       =       "accept_dad",
4302                         .data           =       &ipv6_devconf.accept_dad,
4303                         .maxlen         =       sizeof(int),
4304                         .mode           =       0644,
4305                         .proc_handler   =       proc_dointvec,
4306                 },
4307                 {
4308                         .ctl_name       =       0,      /* sentinel */
4309                 }
4310         },
4311 };
4312
4313 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4314                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4315 {
4316         int i;
4317         struct addrconf_sysctl_table *t;
4318
4319 #define ADDRCONF_CTL_PATH_DEV   3
4320
4321         struct ctl_path addrconf_ctl_path[] = {
4322                 { .procname = "net", .ctl_name = CTL_NET, },
4323                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4324                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4325                 { /* to be set */ },
4326                 { },
4327         };
4328
4329
4330         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4331         if (t == NULL)
4332                 goto out;
4333
4334         for (i=0; t->addrconf_vars[i].data; i++) {
4335                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4336                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4337                 t->addrconf_vars[i].extra2 = net;
4338         }
4339
4340         /*
4341          * Make a copy of dev_name, because '.procname' is regarded as const
4342          * by sysctl and we wouldn't want anyone to change it under our feet
4343          * (see SIOCSIFNAME).
4344          */
4345         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4346         if (!t->dev_name)
4347                 goto free;
4348
4349         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4350         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4351
4352         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4353                         t->addrconf_vars);
4354         if (t->sysctl_header == NULL)
4355                 goto free_procname;
4356
4357         p->sysctl = t;
4358         return 0;
4359
4360 free_procname:
4361         kfree(t->dev_name);
4362 free:
4363         kfree(t);
4364 out:
4365         return -ENOBUFS;
4366 }
4367
4368 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4369 {
4370         struct addrconf_sysctl_table *t;
4371
4372         if (p->sysctl == NULL)
4373                 return;
4374
4375         t = p->sysctl;
4376         p->sysctl = NULL;
4377         unregister_sysctl_table(t->sysctl_header);
4378         kfree(t->dev_name);
4379         kfree(t);
4380 }
4381
4382 static void addrconf_sysctl_register(struct inet6_dev *idev)
4383 {
4384         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4385                               NET_IPV6_NEIGH, "ipv6",
4386                               &ndisc_ifinfo_sysctl_change,
4387                               ndisc_ifinfo_sysctl_strategy);
4388         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4389                         idev->dev->ifindex, idev, &idev->cnf);
4390 }
4391
4392 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4393 {
4394         __addrconf_sysctl_unregister(&idev->cnf);
4395         neigh_sysctl_unregister(idev->nd_parms);
4396 }
4397
4398
4399 #endif
4400
4401 static int addrconf_init_net(struct net *net)
4402 {
4403         int err;
4404         struct ipv6_devconf *all, *dflt;
4405
4406         err = -ENOMEM;
4407         all = &ipv6_devconf;
4408         dflt = &ipv6_devconf_dflt;
4409
4410         if (net != &init_net) {
4411                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4412                 if (all == NULL)
4413                         goto err_alloc_all;
4414
4415                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4416                 if (dflt == NULL)
4417                         goto err_alloc_dflt;
4418         } else {
4419                 /* these will be inherited by all namespaces */
4420                 dflt->autoconf = ipv6_defaults.autoconf;
4421                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4422         }
4423
4424         net->ipv6.devconf_all = all;
4425         net->ipv6.devconf_dflt = dflt;
4426
4427 #ifdef CONFIG_SYSCTL
4428         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4429                         NULL, all);
4430         if (err < 0)
4431                 goto err_reg_all;
4432
4433         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4434                         NULL, dflt);
4435         if (err < 0)
4436                 goto err_reg_dflt;
4437 #endif
4438         return 0;
4439
4440 #ifdef CONFIG_SYSCTL
4441 err_reg_dflt:
4442         __addrconf_sysctl_unregister(all);
4443 err_reg_all:
4444         kfree(dflt);
4445 #endif
4446 err_alloc_dflt:
4447         kfree(all);
4448 err_alloc_all:
4449         return err;
4450 }
4451
4452 static void addrconf_exit_net(struct net *net)
4453 {
4454 #ifdef CONFIG_SYSCTL
4455         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4456         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4457 #endif
4458         if (net != &init_net) {
4459                 kfree(net->ipv6.devconf_dflt);
4460                 kfree(net->ipv6.devconf_all);
4461         }
4462 }
4463
4464 static struct pernet_operations addrconf_ops = {
4465         .init = addrconf_init_net,
4466         .exit = addrconf_exit_net,
4467 };
4468
4469 /*
4470  *      Device notifier
4471  */
4472
4473 int register_inet6addr_notifier(struct notifier_block *nb)
4474 {
4475         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4476 }
4477
4478 EXPORT_SYMBOL(register_inet6addr_notifier);
4479
4480 int unregister_inet6addr_notifier(struct notifier_block *nb)
4481 {
4482         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4483 }
4484
4485 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4486
4487 /*
4488  *      Init / cleanup code
4489  */
4490
4491 int __init addrconf_init(void)
4492 {
4493         int err;
4494
4495         if ((err = ipv6_addr_label_init()) < 0) {
4496                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4497                         err);
4498                 return err;
4499         }
4500
4501         register_pernet_subsys(&addrconf_ops);
4502
4503         /* The addrconf netdev notifier requires that loopback_dev
4504          * has it's ipv6 private information allocated and setup
4505          * before it can bring up and give link-local addresses
4506          * to other devices which are up.
4507          *
4508          * Unfortunately, loopback_dev is not necessarily the first
4509          * entry in the global dev_base list of net devices.  In fact,
4510          * it is likely to be the very last entry on that list.
4511          * So this causes the notifier registry below to try and
4512          * give link-local addresses to all devices besides loopback_dev
4513          * first, then loopback_dev, which cases all the non-loopback_dev
4514          * devices to fail to get a link-local address.
4515          *
4516          * So, as a temporary fix, allocate the ipv6 structure for
4517          * loopback_dev first by hand.
4518          * Longer term, all of the dependencies ipv6 has upon the loopback
4519          * device and it being up should be removed.
4520          */
4521         rtnl_lock();
4522         if (!ipv6_add_dev(init_net.loopback_dev))
4523                 err = -ENOMEM;
4524         rtnl_unlock();
4525         if (err)
4526                 goto errlo;
4527
4528         register_netdevice_notifier(&ipv6_dev_notf);
4529
4530         addrconf_verify(0);
4531
4532         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4533         if (err < 0)
4534                 goto errout;
4535
4536         /* Only the first call to __rtnl_register can fail */
4537         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4538         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4539         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4540         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4541         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4542
4543         ipv6_addr_label_rtnl_register();
4544
4545         return 0;
4546 errout:
4547         unregister_netdevice_notifier(&ipv6_dev_notf);
4548 errlo:
4549         unregister_pernet_subsys(&addrconf_ops);
4550
4551         return err;
4552 }
4553
4554 void addrconf_cleanup(void)
4555 {
4556         struct inet6_ifaddr *ifa;
4557         struct net_device *dev;
4558         int i;
4559
4560         unregister_netdevice_notifier(&ipv6_dev_notf);
4561         unregister_pernet_subsys(&addrconf_ops);
4562
4563         rtnl_lock();
4564
4565         /* clean dev list */
4566         for_each_netdev(&init_net, dev) {
4567                 if (__in6_dev_get(dev) == NULL)
4568                         continue;
4569                 addrconf_ifdown(dev, 1);
4570         }
4571         addrconf_ifdown(init_net.loopback_dev, 2);
4572
4573         /*
4574          *      Check hash table.
4575          */
4576         write_lock_bh(&addrconf_hash_lock);
4577         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4578                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4579                         struct inet6_ifaddr *bifa;
4580
4581                         bifa = ifa;
4582                         ifa = ifa->lst_next;
4583                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4584                         /* Do not free it; something is wrong.
4585                            Now we can investigate it with debugger.
4586                          */
4587                 }
4588         }
4589         write_unlock_bh(&addrconf_hash_lock);
4590
4591         del_timer(&addr_chk_timer);
4592         rtnl_unlock();
4593 }