net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #include <linux/errno.h>
  42 #include <linux/types.h>
  43 #include <linux/kernel.h>
  44 #include <linux/socket.h>
  45 #include <linux/sockios.h>
  46 #include <linux/net.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <linux/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90 #include <linux/export.h>
  91
  92 /* Set to 3 to get tracing... */
  93 #define ACONF_DEBUG 2
  94
  95 #if ACONF_DEBUG >= 3
  96 #define ADBG(x) printk x
  97 #else
  98 #define ADBG(x)
  99 #endif
 100
 101 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 102
 103 static inline u32 cstamp_delta(unsigned long cstamp)
 104 {
 105         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 106 }
 107
 108 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
 109 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
 110 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
 111
 112 #ifdef CONFIG_SYSCTL
 113 static void addrconf_sysctl_register(struct inet6_dev *idev);
 114 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 115 #else
 116 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 117 {
 118 }
 119
 120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 121 {
 122 }
 123 #endif
 124
 125 #ifdef CONFIG_IPV6_PRIVACY
 126 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 128 static void ipv6_regen_rndid(unsigned long data);
 129 #endif
 130
 131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 132 static int ipv6_count_addresses(struct inet6_dev *idev);
 133
 134 /*
 135  *      Configured unicast address hash table
 136  */
 137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 138 static DEFINE_SPINLOCK(addrconf_hash_lock);
 139
 140 static void addrconf_verify(unsigned long);
 141
 142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 143 static DEFINE_SPINLOCK(addrconf_verify_lock);
 144
 145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 147
 148 static void addrconf_type_change(struct net_device *dev,
 149                                  unsigned long event);
 150 static int addrconf_ifdown(struct net_device *dev, int how);
 151
 152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 153 static void addrconf_dad_timer(unsigned long data);
 154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 155 static void addrconf_dad_run(struct inet6_dev *idev);
 156 static void addrconf_rs_timer(unsigned long data);
 157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 159
 160 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 161                                 struct prefix_info *pinfo);
 162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 163                                struct net_device *dev);
 164
 165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 166
 167 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 168         .forwarding             = 0,
 169         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 170         .mtu6                   = IPV6_MIN_MTU,
 171         .accept_ra              = 1,
 172         .accept_redirects       = 1,
 173         .autoconf               = 1,
 174         .force_mld_version      = 0,
 175         .dad_transmits          = 1,
 176         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 177         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 178         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 179 #ifdef CONFIG_IPV6_PRIVACY
 180         .use_tempaddr           = 0,
 181         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 182         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 183         .regen_max_retry        = REGEN_MAX_RETRY,
 184         .max_desync_factor      = MAX_DESYNC_FACTOR,
 185 #endif
 186         .max_addresses          = IPV6_MAX_ADDRESSES,
 187         .accept_ra_defrtr       = 1,
 188         .accept_ra_pinfo        = 1,
 189 #ifdef CONFIG_IPV6_ROUTER_PREF
 190         .accept_ra_rtr_pref     = 1,
 191         .rtr_probe_interval     = 60 * HZ,
 192 #ifdef CONFIG_IPV6_ROUTE_INFO
 193         .accept_ra_rt_info_max_plen = 0,
 194 #endif
 195 #endif
 196         .proxy_ndp              = 0,
 197         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 198         .disable_ipv6           = 0,
 199         .accept_dad             = 1,
 200 };
 201
 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 203         .forwarding             = 0,
 204         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 205         .mtu6                   = IPV6_MIN_MTU,
 206         .accept_ra              = 1,
 207         .accept_redirects       = 1,
 208         .autoconf               = 1,
 209         .dad_transmits          = 1,
 210         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 211         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 212         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 213 #ifdef CONFIG_IPV6_PRIVACY
 214         .use_tempaddr           = 0,
 215         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 216         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 217         .regen_max_retry        = REGEN_MAX_RETRY,
 218         .max_desync_factor      = MAX_DESYNC_FACTOR,
 219 #endif
 220         .max_addresses          = IPV6_MAX_ADDRESSES,
 221         .accept_ra_defrtr       = 1,
 222         .accept_ra_pinfo        = 1,
 223 #ifdef CONFIG_IPV6_ROUTER_PREF
 224         .accept_ra_rtr_pref     = 1,
 225         .rtr_probe_interval     = 60 * HZ,
 226 #ifdef CONFIG_IPV6_ROUTE_INFO
 227         .accept_ra_rt_info_max_plen = 0,
 228 #endif
 229 #endif
 230         .proxy_ndp              = 0,
 231         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 232         .disable_ipv6           = 0,
 233         .accept_dad             = 1,
 234 };
 235
 236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 241
 242 /* Check if a valid qdisc is available */
 243 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 244 {
 245         return !qdisc_tx_is_noop(dev);
 246 }
 247
 248 /* Check if a route is valid prefix route */
 249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 250 {
 251         return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
 252 }
 253
 254 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 255 {
 256         if (del_timer(&ifp->timer))
 257                 __in6_ifa_put(ifp);
 258 }
 259
 260 enum addrconf_timer_t {
 261         AC_NONE,
 262         AC_DAD,
 263         AC_RS,
 264 };
 265
 266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 267                                enum addrconf_timer_t what,
 268                                unsigned long when)
 269 {
 270         if (!del_timer(&ifp->timer))
 271                 in6_ifa_hold(ifp);
 272
 273         switch (what) {
 274         case AC_DAD:
 275                 ifp->timer.function = addrconf_dad_timer;
 276                 break;
 277         case AC_RS:
 278                 ifp->timer.function = addrconf_rs_timer;
 279                 break;
 280         default:
 281                 break;
 282         }
 283         ifp->timer.expires = jiffies + when;
 284         add_timer(&ifp->timer);
 285 }
 286
 287 static int snmp6_alloc_dev(struct inet6_dev *idev)
 288 {
 289         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 290                           sizeof(struct ipstats_mib),
 291                           __alignof__(struct ipstats_mib)) < 0)
 292                 goto err_ip;
 293         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 294                                         GFP_KERNEL);
 295         if (!idev->stats.icmpv6dev)
 296                 goto err_icmp;
 297         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 298                                            GFP_KERNEL);
 299         if (!idev->stats.icmpv6msgdev)
 300                 goto err_icmpmsg;
 301
 302         return 0;
 303
 304 err_icmpmsg:
 305         kfree(idev->stats.icmpv6dev);
 306 err_icmp:
 307         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 308 err_ip:
 309         return -ENOMEM;
 310 }
 311
 312 static void snmp6_free_dev(struct inet6_dev *idev)
 313 {
 314         kfree(idev->stats.icmpv6msgdev);
 315         kfree(idev->stats.icmpv6dev);
 316         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 317 }
 318
 319 /* Nobody refers to this device, we may destroy it. */
 320
 321 void in6_dev_finish_destroy(struct inet6_dev *idev)
 322 {
 323         struct net_device *dev = idev->dev;
 324
 325         WARN_ON(!list_empty(&idev->addr_list));
 326         WARN_ON(idev->mc_list != NULL);
 327
 328 #ifdef NET_REFCNT_DEBUG
 329         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 330 #endif
 331         dev_put(dev);
 332         if (!idev->dead) {
 333                 pr_warning("Freeing alive inet6 device %p\n", idev);
 334                 return;
 335         }
 336         snmp6_free_dev(idev);
 337         kfree_rcu(idev, rcu);
 338 }
 339
 340 EXPORT_SYMBOL(in6_dev_finish_destroy);
 341
 342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 343 {
 344         struct inet6_dev *ndev;
 345
 346         ASSERT_RTNL();
 347
 348         if (dev->mtu < IPV6_MIN_MTU)
 349                 return NULL;
 350
 351         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 352
 353         if (ndev == NULL)
 354                 return NULL;
 355
 356         rwlock_init(&ndev->lock);
 357         ndev->dev = dev;
 358         INIT_LIST_HEAD(&ndev->addr_list);
 359
 360         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 361         ndev->cnf.mtu6 = dev->mtu;
 362         ndev->cnf.sysctl = NULL;
 363         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 364         if (ndev->nd_parms == NULL) {
 365                 kfree(ndev);
 366                 return NULL;
 367         }
 368         if (ndev->cnf.forwarding)
 369                 dev_disable_lro(dev);
 370         /* We refer to the device */
 371         dev_hold(dev);
 372
 373         if (snmp6_alloc_dev(ndev) < 0) {
 374                 ADBG((KERN_WARNING
 375                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 376                         __func__, dev->name));
 377                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 378                 dev_put(dev);
 379                 kfree(ndev);
 380                 return NULL;
 381         }
 382
 383         if (snmp6_register_dev(ndev) < 0) {
 384                 ADBG((KERN_WARNING
 385                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 386                         __func__, dev->name));
 387                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 388                 ndev->dead = 1;
 389                 in6_dev_finish_destroy(ndev);
 390                 return NULL;
 391         }
 392
 393         /* One reference from device.  We must do this before
 394          * we invoke __ipv6_regen_rndid().
 395          */
 396         in6_dev_hold(ndev);
 397
 398         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 399                 ndev->cnf.accept_dad = -1;
 400
 401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 402         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 403                 printk(KERN_INFO
 404                        "%s: Disabled Multicast RS\n",
 405                        dev->name);
 406                 ndev->cnf.rtr_solicits = 0;
 407         }
 408 #endif
 409
 410 #ifdef CONFIG_IPV6_PRIVACY
 411         INIT_LIST_HEAD(&ndev->tempaddr_list);
 412         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 413         if ((dev->flags&IFF_LOOPBACK) ||
 414             dev->type == ARPHRD_TUNNEL ||
 415             dev->type == ARPHRD_TUNNEL6 ||
 416             dev->type == ARPHRD_SIT ||
 417             dev->type == ARPHRD_NONE) {
 418                 ndev->cnf.use_tempaddr = -1;
 419         } else {
 420                 in6_dev_hold(ndev);
 421                 ipv6_regen_rndid((unsigned long) ndev);
 422         }
 423 #endif
 424
 425         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 426                 ndev->if_flags |= IF_READY;
 427
 428         ipv6_mc_init_dev(ndev);
 429         ndev->tstamp = jiffies;
 430         addrconf_sysctl_register(ndev);
 431         /* protected by rtnl_lock */
 432         rcu_assign_pointer(dev->ip6_ptr, ndev);
 433
 434         /* Join all-node multicast group */
 435         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 436
 437         /* Join all-router multicast group if forwarding is set */
 438         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 439                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 440
 441         return ndev;
 442 }
 443
 444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 445 {
 446         struct inet6_dev *idev;
 447
 448         ASSERT_RTNL();
 449
 450         idev = __in6_dev_get(dev);
 451         if (!idev) {
 452                 idev = ipv6_add_dev(dev);
 453                 if (!idev)
 454                         return NULL;
 455         }
 456
 457         if (dev->flags&IFF_UP)
 458                 ipv6_mc_up(idev);
 459         return idev;
 460 }
 461
 462 #ifdef CONFIG_SYSCTL
 463 static void dev_forward_change(struct inet6_dev *idev)
 464 {
 465         struct net_device *dev;
 466         struct inet6_ifaddr *ifa;
 467
 468         if (!idev)
 469                 return;
 470         dev = idev->dev;
 471         if (idev->cnf.forwarding)
 472                 dev_disable_lro(dev);
 473         if (dev && (dev->flags & IFF_MULTICAST)) {
 474                 if (idev->cnf.forwarding)
 475                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 476                 else
 477                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 478         }
 479
 480         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 481                 if (ifa->flags&IFA_F_TENTATIVE)
 482                         continue;
 483                 if (idev->cnf.forwarding)
 484                         addrconf_join_anycast(ifa);
 485                 else
 486                         addrconf_leave_anycast(ifa);
 487         }
 488 }
 489
 490
 491 static void addrconf_forward_change(struct net *net, __s32 newf)
 492 {
 493         struct net_device *dev;
 494         struct inet6_dev *idev;
 495
 496         for_each_netdev(net, dev) {
 497                 idev = __in6_dev_get(dev);
 498                 if (idev) {
 499                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 500                         idev->cnf.forwarding = newf;
 501                         if (changed)
 502                                 dev_forward_change(idev);
 503                 }
 504         }
 505 }
 506
 507 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 508 {
 509         struct net *net;
 510         int old;
 511
 512         if (!rtnl_trylock())
 513                 return restart_syscall();
 514
 515         net = (struct net *)table->extra2;
 516         old = *p;
 517         *p = newf;
 518
 519         if (p == &net->ipv6.devconf_dflt->forwarding) {
 520                 rtnl_unlock();
 521                 return 0;
 522         }
 523
 524         if (p == &net->ipv6.devconf_all->forwarding) {
 525                 net->ipv6.devconf_dflt->forwarding = newf;
 526                 addrconf_forward_change(net, newf);
 527         } else if ((!newf) ^ (!old))
 528                 dev_forward_change((struct inet6_dev *)table->extra1);
 529         rtnl_unlock();
 530
 531         if (newf)
 532                 rt6_purge_dflt_routers(net);
 533         return 1;
 534 }
 535 #endif
 536
 537 /* Nobody refers to this ifaddr, destroy it */
 538 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 539 {
 540         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 541
 542 #ifdef NET_REFCNT_DEBUG
 543         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 544 #endif
 545
 546         in6_dev_put(ifp->idev);
 547
 548         if (del_timer(&ifp->timer))
 549                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 550
 551         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 552                 pr_warning("Freeing alive inet6 address %p\n", ifp);
 553                 return;
 554         }
 555         dst_release(&ifp->rt->dst);
 556
 557         kfree_rcu(ifp, rcu);
 558 }
 559
 560 static void
 561 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 562 {
 563         struct list_head *p;
 564         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 565
 566         /*
 567          * Each device address list is sorted in order of scope -
 568          * global before linklocal.
 569          */
 570         list_for_each(p, &idev->addr_list) {
 571                 struct inet6_ifaddr *ifa
 572                         = list_entry(p, struct inet6_ifaddr, if_list);
 573                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 574                         break;
 575         }
 576
 577         list_add_tail(&ifp->if_list, p);
 578 }
 579
 580 static u32 ipv6_addr_hash(const struct in6_addr *addr)
 581 {
 582         /*
 583          * We perform the hash function over the last 64 bits of the address
 584          * This will include the IEEE address token on links that support it.
 585          */
 586         return jhash_2words((__force u32)addr->s6_addr32[2],
 587                             (__force u32)addr->s6_addr32[3], 0)
 588                 & (IN6_ADDR_HSIZE - 1);
 589 }
 590
 591 /* On success it returns ifp with increased reference count */
 592
 593 static struct inet6_ifaddr *
 594 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 595               int scope, u32 flags)
 596 {
 597         struct inet6_ifaddr *ifa = NULL;
 598         struct rt6_info *rt;
 599         unsigned int hash;
 600         int err = 0;
 601         int addr_type = ipv6_addr_type(addr);
 602
 603         if (addr_type == IPV6_ADDR_ANY ||
 604             addr_type & IPV6_ADDR_MULTICAST ||
 605             (!(idev->dev->flags & IFF_LOOPBACK) &&
 606              addr_type & IPV6_ADDR_LOOPBACK))
 607                 return ERR_PTR(-EADDRNOTAVAIL);
 608
 609         rcu_read_lock_bh();
 610         if (idev->dead) {
 611                 err = -ENODEV;                  /*XXX*/
 612                 goto out2;
 613         }
 614
 615         if (idev->cnf.disable_ipv6) {
 616                 err = -EACCES;
 617                 goto out2;
 618         }
 619
 620         spin_lock(&addrconf_hash_lock);
 621
 622         /* Ignore adding duplicate addresses on an interface */
 623         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 624                 ADBG(("ipv6_add_addr: already assigned\n"));
 625                 err = -EEXIST;
 626                 goto out;
 627         }
 628
 629         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 630
 631         if (ifa == NULL) {
 632                 ADBG(("ipv6_add_addr: malloc failed\n"));
 633                 err = -ENOBUFS;
 634                 goto out;
 635         }
 636
 637         rt = addrconf_dst_alloc(idev, addr, false);
 638         if (IS_ERR(rt)) {
 639                 err = PTR_ERR(rt);
 640                 goto out;
 641         }
 642
 643         ifa->addr = *addr;
 644
 645         spin_lock_init(&ifa->lock);
 646         spin_lock_init(&ifa->state_lock);
 647         init_timer(&ifa->timer);
 648         INIT_HLIST_NODE(&ifa->addr_lst);
 649         ifa->timer.data = (unsigned long) ifa;
 650         ifa->scope = scope;
 651         ifa->prefix_len = pfxlen;
 652         ifa->flags = flags | IFA_F_TENTATIVE;
 653         ifa->cstamp = ifa->tstamp = jiffies;
 654
 655         ifa->rt = rt;
 656
 657         ifa->idev = idev;
 658         in6_dev_hold(idev);
 659         /* For caller */
 660         in6_ifa_hold(ifa);
 661
 662         /* Add to big hash table */
 663         hash = ipv6_addr_hash(addr);
 664
 665         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 666         spin_unlock(&addrconf_hash_lock);
 667
 668         write_lock(&idev->lock);
 669         /* Add to inet6_dev unicast addr list. */
 670         ipv6_link_dev_addr(idev, ifa);
 671
 672 #ifdef CONFIG_IPV6_PRIVACY
 673         if (ifa->flags&IFA_F_TEMPORARY) {
 674                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 675                 in6_ifa_hold(ifa);
 676         }
 677 #endif
 678
 679         in6_ifa_hold(ifa);
 680         write_unlock(&idev->lock);
 681 out2:
 682         rcu_read_unlock_bh();
 683
 684         if (likely(err == 0))
 685                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 686         else {
 687                 kfree(ifa);
 688                 ifa = ERR_PTR(err);
 689         }
 690
 691         return ifa;
 692 out:
 693         spin_unlock(&addrconf_hash_lock);
 694         goto out2;
 695 }
 696
 697 /* This function wants to get referenced ifp and releases it before return */
 698
 699 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 700 {
 701         struct inet6_ifaddr *ifa, *ifn;
 702         struct inet6_dev *idev = ifp->idev;
 703         int state;
 704         int deleted = 0, onlink = 0;
 705         unsigned long expires = jiffies;
 706
 707         spin_lock_bh(&ifp->state_lock);
 708         state = ifp->state;
 709         ifp->state = INET6_IFADDR_STATE_DEAD;
 710         spin_unlock_bh(&ifp->state_lock);
 711
 712         if (state == INET6_IFADDR_STATE_DEAD)
 713                 goto out;
 714
 715         spin_lock_bh(&addrconf_hash_lock);
 716         hlist_del_init_rcu(&ifp->addr_lst);
 717         spin_unlock_bh(&addrconf_hash_lock);
 718
 719         write_lock_bh(&idev->lock);
 720 #ifdef CONFIG_IPV6_PRIVACY
 721         if (ifp->flags&IFA_F_TEMPORARY) {
 722                 list_del(&ifp->tmp_list);
 723                 if (ifp->ifpub) {
 724                         in6_ifa_put(ifp->ifpub);
 725                         ifp->ifpub = NULL;
 726                 }
 727                 __in6_ifa_put(ifp);
 728         }
 729 #endif
 730
 731         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 732                 if (ifa == ifp) {
 733                         list_del_init(&ifp->if_list);
 734                         __in6_ifa_put(ifp);
 735
 736                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 737                                 break;
 738                         deleted = 1;
 739                         continue;
 740                 } else if (ifp->flags & IFA_F_PERMANENT) {
 741                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 742                                               ifp->prefix_len)) {
 743                                 if (ifa->flags & IFA_F_PERMANENT) {
 744                                         onlink = 1;
 745                                         if (deleted)
 746                                                 break;
 747                                 } else {
 748                                         unsigned long lifetime;
 749
 750                                         if (!onlink)
 751                                                 onlink = -1;
 752
 753                                         spin_lock(&ifa->lock);
 754
 755                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 756                                         /*
 757                                          * Note: Because this address is
 758                                          * not permanent, lifetime <
 759                                          * LONG_MAX / HZ here.
 760                                          */
 761                                         if (time_before(expires,
 762                                                         ifa->tstamp + lifetime * HZ))
 763                                                 expires = ifa->tstamp + lifetime * HZ;
 764                                         spin_unlock(&ifa->lock);
 765                                 }
 766                         }
 767                 }
 768         }
 769         write_unlock_bh(&idev->lock);
 770
 771         addrconf_del_timer(ifp);
 772
 773         ipv6_ifa_notify(RTM_DELADDR, ifp);
 774
 775         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 776
 777         /*
 778          * Purge or update corresponding prefix
 779          *
 780          * 1) we don't purge prefix here if address was not permanent.
 781          *    prefix is managed by its own lifetime.
 782          * 2) if there're no addresses, delete prefix.
 783          * 3) if there're still other permanent address(es),
 784          *    corresponding prefix is still permanent.
 785          * 4) otherwise, update prefix lifetime to the
 786          *    longest valid lifetime among the corresponding
 787          *    addresses on the device.
 788          *    Note: subsequent RA will update lifetime.
 789          *
 790          * --yoshfuji
 791          */
 792         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 793                 struct in6_addr prefix;
 794                 struct rt6_info *rt;
 795                 struct net *net = dev_net(ifp->idev->dev);
 796                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 797                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 798
 799                 if (rt && addrconf_is_prefix_route(rt)) {
 800                         if (onlink == 0) {
 801                                 ip6_del_rt(rt);
 802                                 rt = NULL;
 803                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 804                                 rt6_set_expires(rt, expires);
 805                         }
 806                 }
 807                 dst_release(&rt->dst);
 808         }
 809
 810         /* clean up prefsrc entries */
 811         rt6_remove_prefsrc(ifp);
 812 out:
 813         in6_ifa_put(ifp);
 814 }
 815
 816 #ifdef CONFIG_IPV6_PRIVACY
 817 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 818 {
 819         struct inet6_dev *idev = ifp->idev;
 820         struct in6_addr addr, *tmpaddr;
 821         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
 822         unsigned long regen_advance;
 823         int tmp_plen;
 824         int ret = 0;
 825         int max_addresses;
 826         u32 addr_flags;
 827         unsigned long now = jiffies;
 828
 829         write_lock(&idev->lock);
 830         if (ift) {
 831                 spin_lock_bh(&ift->lock);
 832                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 833                 spin_unlock_bh(&ift->lock);
 834                 tmpaddr = &addr;
 835         } else {
 836                 tmpaddr = NULL;
 837         }
 838 retry:
 839         in6_dev_hold(idev);
 840         if (idev->cnf.use_tempaddr <= 0) {
 841                 write_unlock(&idev->lock);
 842                 printk(KERN_INFO
 843                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 844                 in6_dev_put(idev);
 845                 ret = -1;
 846                 goto out;
 847         }
 848         spin_lock_bh(&ifp->lock);
 849         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 850                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 851                 spin_unlock_bh(&ifp->lock);
 852                 write_unlock(&idev->lock);
 853                 printk(KERN_WARNING
 854                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 855                 in6_dev_put(idev);
 856                 ret = -1;
 857                 goto out;
 858         }
 859         in6_ifa_hold(ifp);
 860         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 861         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 862                 spin_unlock_bh(&ifp->lock);
 863                 write_unlock(&idev->lock);
 864                 printk(KERN_WARNING
 865                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 866                 in6_ifa_put(ifp);
 867                 in6_dev_put(idev);
 868                 ret = -1;
 869                 goto out;
 870         }
 871         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 872         age = (now - ifp->tstamp) / HZ;
 873         tmp_valid_lft = min_t(__u32,
 874                               ifp->valid_lft,
 875                               idev->cnf.temp_valid_lft + age);
 876         tmp_prefered_lft = min_t(__u32,
 877                                  ifp->prefered_lft,
 878                                  idev->cnf.temp_prefered_lft + age -
 879                                  idev->cnf.max_desync_factor);
 880         tmp_plen = ifp->prefix_len;
 881         max_addresses = idev->cnf.max_addresses;
 882         tmp_tstamp = ifp->tstamp;
 883         spin_unlock_bh(&ifp->lock);
 884
 885         regen_advance = idev->cnf.regen_max_retry *
 886                         idev->cnf.dad_transmits *
 887                         idev->nd_parms->retrans_time / HZ;
 888         write_unlock(&idev->lock);
 889
 890         /* A temporary address is created only if this calculated Preferred
 891          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 892          * an implementation must not create a temporary address with a zero
 893          * Preferred Lifetime.
 894          */
 895         if (tmp_prefered_lft <= regen_advance) {
 896                 in6_ifa_put(ifp);
 897                 in6_dev_put(idev);
 898                 ret = -1;
 899                 goto out;
 900         }
 901
 902         addr_flags = IFA_F_TEMPORARY;
 903         /* set in addrconf_prefix_rcv() */
 904         if (ifp->flags & IFA_F_OPTIMISTIC)
 905                 addr_flags |= IFA_F_OPTIMISTIC;
 906
 907         ift = !max_addresses ||
 908               ipv6_count_addresses(idev) < max_addresses ?
 909                 ipv6_add_addr(idev, &addr, tmp_plen,
 910                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 911                               addr_flags) : NULL;
 912         if (!ift || IS_ERR(ift)) {
 913                 in6_ifa_put(ifp);
 914                 in6_dev_put(idev);
 915                 printk(KERN_INFO
 916                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 917                 tmpaddr = &addr;
 918                 write_lock(&idev->lock);
 919                 goto retry;
 920         }
 921
 922         spin_lock_bh(&ift->lock);
 923         ift->ifpub = ifp;
 924         ift->valid_lft = tmp_valid_lft;
 925         ift->prefered_lft = tmp_prefered_lft;
 926         ift->cstamp = now;
 927         ift->tstamp = tmp_tstamp;
 928         spin_unlock_bh(&ift->lock);
 929
 930         addrconf_dad_start(ift, 0);
 931         in6_ifa_put(ift);
 932         in6_dev_put(idev);
 933 out:
 934         return ret;
 935 }
 936 #endif
 937
 938 /*
 939  *      Choose an appropriate source address (RFC3484)
 940  */
 941 enum {
 942         IPV6_SADDR_RULE_INIT = 0,
 943         IPV6_SADDR_RULE_LOCAL,
 944         IPV6_SADDR_RULE_SCOPE,
 945         IPV6_SADDR_RULE_PREFERRED,
 946 #ifdef CONFIG_IPV6_MIP6
 947         IPV6_SADDR_RULE_HOA,
 948 #endif
 949         IPV6_SADDR_RULE_OIF,
 950         IPV6_SADDR_RULE_LABEL,
 951 #ifdef CONFIG_IPV6_PRIVACY
 952         IPV6_SADDR_RULE_PRIVACY,
 953 #endif
 954         IPV6_SADDR_RULE_ORCHID,
 955         IPV6_SADDR_RULE_PREFIX,
 956         IPV6_SADDR_RULE_MAX
 957 };
 958
 959 struct ipv6_saddr_score {
 960         int                     rule;
 961         int                     addr_type;
 962         struct inet6_ifaddr     *ifa;
 963         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 964         int                     scopedist;
 965         int                     matchlen;
 966 };
 967
 968 struct ipv6_saddr_dst {
 969         const struct in6_addr *addr;
 970         int ifindex;
 971         int scope;
 972         int label;
 973         unsigned int prefs;
 974 };
 975
 976 static inline int ipv6_saddr_preferred(int type)
 977 {
 978         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
 979                 return 1;
 980         return 0;
 981 }
 982
 983 static int ipv6_get_saddr_eval(struct net *net,
 984                                struct ipv6_saddr_score *score,
 985                                struct ipv6_saddr_dst *dst,
 986                                int i)
 987 {
 988         int ret;
 989
 990         if (i <= score->rule) {
 991                 switch (i) {
 992                 case IPV6_SADDR_RULE_SCOPE:
 993                         ret = score->scopedist;
 994                         break;
 995                 case IPV6_SADDR_RULE_PREFIX:
 996                         ret = score->matchlen;
 997                         break;
 998                 default:
 999                         ret = !!test_bit(i, score->scorebits);
1000                 }
1001                 goto out;
1002         }
1003
1004         switch (i) {
1005         case IPV6_SADDR_RULE_INIT:
1006                 /* Rule 0: remember if hiscore is not ready yet */
1007                 ret = !!score->ifa;
1008                 break;
1009         case IPV6_SADDR_RULE_LOCAL:
1010                 /* Rule 1: Prefer same address */
1011                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1012                 break;
1013         case IPV6_SADDR_RULE_SCOPE:
1014                 /* Rule 2: Prefer appropriate scope
1015                  *
1016                  *      ret
1017                  *       ^
1018                  *    -1 |  d 15
1019                  *    ---+--+-+---> scope
1020                  *       |
1021                  *       |             d is scope of the destination.
1022                  *  B-d  |  \
1023                  *       |   \      <- smaller scope is better if
1024                  *  B-15 |    \        if scope is enough for destinaion.
1025                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1026                  * d-C-1 | /
1027                  *       |/         <- greater is better
1028                  *   -C  /             if scope is not enough for destination.
1029                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1030                  *
1031                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1032                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1033                  * Assume B = 0 and we get C > 29.
1034                  */
1035                 ret = __ipv6_addr_src_scope(score->addr_type);
1036                 if (ret >= dst->scope)
1037                         ret = -ret;
1038                 else
1039                         ret -= 128;     /* 30 is enough */
1040                 score->scopedist = ret;
1041                 break;
1042         case IPV6_SADDR_RULE_PREFERRED:
1043                 /* Rule 3: Avoid deprecated and optimistic addresses */
1044                 ret = ipv6_saddr_preferred(score->addr_type) ||
1045                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1046                 break;
1047 #ifdef CONFIG_IPV6_MIP6
1048         case IPV6_SADDR_RULE_HOA:
1049             {
1050                 /* Rule 4: Prefer home address */
1051                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1052                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1053                 break;
1054             }
1055 #endif
1056         case IPV6_SADDR_RULE_OIF:
1057                 /* Rule 5: Prefer outgoing interface */
1058                 ret = (!dst->ifindex ||
1059                        dst->ifindex == score->ifa->idev->dev->ifindex);
1060                 break;
1061         case IPV6_SADDR_RULE_LABEL:
1062                 /* Rule 6: Prefer matching label */
1063                 ret = ipv6_addr_label(net,
1064                                       &score->ifa->addr, score->addr_type,
1065                                       score->ifa->idev->dev->ifindex) == dst->label;
1066                 break;
1067 #ifdef CONFIG_IPV6_PRIVACY
1068         case IPV6_SADDR_RULE_PRIVACY:
1069             {
1070                 /* Rule 7: Prefer public address
1071                  * Note: prefer temporary address if use_tempaddr >= 2
1072                  */
1073                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1074                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1075                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1076                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1077                 break;
1078             }
1079 #endif
1080         case IPV6_SADDR_RULE_ORCHID:
1081                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1082                  *          non-ORCHID vs non-ORCHID
1083                  */
1084                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1085                         ipv6_addr_orchid(dst->addr));
1086                 break;
1087         case IPV6_SADDR_RULE_PREFIX:
1088                 /* Rule 8: Use longest matching prefix */
1089                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1090                                                        dst->addr);
1091                 break;
1092         default:
1093                 ret = 0;
1094         }
1095
1096         if (ret)
1097                 __set_bit(i, score->scorebits);
1098         score->rule = i;
1099 out:
1100         return ret;
1101 }
1102
1103 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1104                        const struct in6_addr *daddr, unsigned int prefs,
1105                        struct in6_addr *saddr)
1106 {
1107         struct ipv6_saddr_score scores[2],
1108                                 *score = &scores[0], *hiscore = &scores[1];
1109         struct ipv6_saddr_dst dst;
1110         struct net_device *dev;
1111         int dst_type;
1112
1113         dst_type = __ipv6_addr_type(daddr);
1114         dst.addr = daddr;
1115         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1116         dst.scope = __ipv6_addr_src_scope(dst_type);
1117         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1118         dst.prefs = prefs;
1119
1120         hiscore->rule = -1;
1121         hiscore->ifa = NULL;
1122
1123         rcu_read_lock();
1124
1125         for_each_netdev_rcu(net, dev) {
1126                 struct inet6_dev *idev;
1127
1128                 /* Candidate Source Address (section 4)
1129                  *  - multicast and link-local destination address,
1130                  *    the set of candidate source address MUST only
1131                  *    include addresses assigned to interfaces
1132                  *    belonging to the same link as the outgoing
1133                  *    interface.
1134                  * (- For site-local destination addresses, the
1135                  *    set of candidate source addresses MUST only
1136                  *    include addresses assigned to interfaces
1137                  *    belonging to the same site as the outgoing
1138                  *    interface.)
1139                  */
1140                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1141                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1142                     dst.ifindex && dev->ifindex != dst.ifindex)
1143                         continue;
1144
1145                 idev = __in6_dev_get(dev);
1146                 if (!idev)
1147                         continue;
1148
1149                 read_lock_bh(&idev->lock);
1150                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1151                         int i;
1152
1153                         /*
1154                          * - Tentative Address (RFC2462 section 5.4)
1155                          *  - A tentative address is not considered
1156                          *    "assigned to an interface" in the traditional
1157                          *    sense, unless it is also flagged as optimistic.
1158                          * - Candidate Source Address (section 4)
1159                          *  - In any case, anycast addresses, multicast
1160                          *    addresses, and the unspecified address MUST
1161                          *    NOT be included in a candidate set.
1162                          */
1163                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1164                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1165                                 continue;
1166
1167                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1168
1169                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1170                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1171                                 LIMIT_NETDEBUG(KERN_DEBUG
1172                                                "ADDRCONF: unspecified / multicast address "
1173                                                "assigned as unicast address on %s",
1174                                                dev->name);
1175                                 continue;
1176                         }
1177
1178                         score->rule = -1;
1179                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1180
1181                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1182                                 int minihiscore, miniscore;
1183
1184                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1185                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1186
1187                                 if (minihiscore > miniscore) {
1188                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1189                                             score->scopedist > 0) {
1190                                                 /*
1191                                                  * special case:
1192                                                  * each remaining entry
1193                                                  * has too small (not enough)
1194                                                  * scope, because ifa entries
1195                                                  * are sorted by their scope
1196                                                  * values.
1197                                                  */
1198                                                 goto try_nextdev;
1199                                         }
1200                                         break;
1201                                 } else if (minihiscore < miniscore) {
1202                                         if (hiscore->ifa)
1203                                                 in6_ifa_put(hiscore->ifa);
1204
1205                                         in6_ifa_hold(score->ifa);
1206
1207                                         swap(hiscore, score);
1208
1209                                         /* restore our iterator */
1210                                         score->ifa = hiscore->ifa;
1211
1212                                         break;
1213                                 }
1214                         }
1215                 }
1216 try_nextdev:
1217                 read_unlock_bh(&idev->lock);
1218         }
1219         rcu_read_unlock();
1220
1221         if (!hiscore->ifa)
1222                 return -EADDRNOTAVAIL;
1223
1224         *saddr = hiscore->ifa->addr;
1225         in6_ifa_put(hiscore->ifa);
1226         return 0;
1227 }
1228 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1229
1230 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1231                     unsigned char banned_flags)
1232 {
1233         struct inet6_dev *idev;
1234         int err = -EADDRNOTAVAIL;
1235
1236         rcu_read_lock();
1237         idev = __in6_dev_get(dev);
1238         if (idev) {
1239                 struct inet6_ifaddr *ifp;
1240
1241                 read_lock_bh(&idev->lock);
1242                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1243                         if (ifp->scope == IFA_LINK &&
1244                             !(ifp->flags & banned_flags)) {
1245                                 *addr = ifp->addr;
1246                                 err = 0;
1247                                 break;
1248                         }
1249                 }
1250                 read_unlock_bh(&idev->lock);
1251         }
1252         rcu_read_unlock();
1253         return err;
1254 }
1255
1256 static int ipv6_count_addresses(struct inet6_dev *idev)
1257 {
1258         int cnt = 0;
1259         struct inet6_ifaddr *ifp;
1260
1261         read_lock_bh(&idev->lock);
1262         list_for_each_entry(ifp, &idev->addr_list, if_list)
1263                 cnt++;
1264         read_unlock_bh(&idev->lock);
1265         return cnt;
1266 }
1267
1268 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1269                   struct net_device *dev, int strict)
1270 {
1271         struct inet6_ifaddr *ifp;
1272         struct hlist_node *node;
1273         unsigned int hash = ipv6_addr_hash(addr);
1274
1275         rcu_read_lock_bh();
1276         hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1277                 if (!net_eq(dev_net(ifp->idev->dev), net))
1278                         continue;
1279                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1280                     !(ifp->flags&IFA_F_TENTATIVE) &&
1281                     (dev == NULL || ifp->idev->dev == dev ||
1282                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1283                         rcu_read_unlock_bh();
1284                         return 1;
1285                 }
1286         }
1287
1288         rcu_read_unlock_bh();
1289         return 0;
1290 }
1291 EXPORT_SYMBOL(ipv6_chk_addr);
1292
1293 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1294                                struct net_device *dev)
1295 {
1296         unsigned int hash = ipv6_addr_hash(addr);
1297         struct inet6_ifaddr *ifp;
1298         struct hlist_node *node;
1299
1300         hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1301                 if (!net_eq(dev_net(ifp->idev->dev), net))
1302                         continue;
1303                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1304                         if (dev == NULL || ifp->idev->dev == dev)
1305                                 return true;
1306                 }
1307         }
1308         return false;
1309 }
1310
1311 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1312 {
1313         struct inet6_dev *idev;
1314         struct inet6_ifaddr *ifa;
1315         int     onlink;
1316
1317         onlink = 0;
1318         rcu_read_lock();
1319         idev = __in6_dev_get(dev);
1320         if (idev) {
1321                 read_lock_bh(&idev->lock);
1322                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1323                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1324                                                    ifa->prefix_len);
1325                         if (onlink)
1326                                 break;
1327                 }
1328                 read_unlock_bh(&idev->lock);
1329         }
1330         rcu_read_unlock();
1331         return onlink;
1332 }
1333
1334 EXPORT_SYMBOL(ipv6_chk_prefix);
1335
1336 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1337                                      struct net_device *dev, int strict)
1338 {
1339         struct inet6_ifaddr *ifp, *result = NULL;
1340         unsigned int hash = ipv6_addr_hash(addr);
1341         struct hlist_node *node;
1342
1343         rcu_read_lock_bh();
1344         hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1345                 if (!net_eq(dev_net(ifp->idev->dev), net))
1346                         continue;
1347                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1348                         if (dev == NULL || ifp->idev->dev == dev ||
1349                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1350                                 result = ifp;
1351                                 in6_ifa_hold(ifp);
1352                                 break;
1353                         }
1354                 }
1355         }
1356         rcu_read_unlock_bh();
1357
1358         return result;
1359 }
1360
1361 /* Gets referenced address, destroys ifaddr */
1362
1363 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1364 {
1365         if (ifp->flags&IFA_F_PERMANENT) {
1366                 spin_lock_bh(&ifp->lock);
1367                 addrconf_del_timer(ifp);
1368                 ifp->flags |= IFA_F_TENTATIVE;
1369                 if (dad_failed)
1370                         ifp->flags |= IFA_F_DADFAILED;
1371                 spin_unlock_bh(&ifp->lock);
1372                 if (dad_failed)
1373                         ipv6_ifa_notify(0, ifp);
1374                 in6_ifa_put(ifp);
1375 #ifdef CONFIG_IPV6_PRIVACY
1376         } else if (ifp->flags&IFA_F_TEMPORARY) {
1377                 struct inet6_ifaddr *ifpub;
1378                 spin_lock_bh(&ifp->lock);
1379                 ifpub = ifp->ifpub;
1380                 if (ifpub) {
1381                         in6_ifa_hold(ifpub);
1382                         spin_unlock_bh(&ifp->lock);
1383                         ipv6_create_tempaddr(ifpub, ifp);
1384                         in6_ifa_put(ifpub);
1385                 } else {
1386                         spin_unlock_bh(&ifp->lock);
1387                 }
1388                 ipv6_del_addr(ifp);
1389 #endif
1390         } else
1391                 ipv6_del_addr(ifp);
1392 }
1393
1394 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1395 {
1396         int err = -ENOENT;
1397
1398         spin_lock(&ifp->state_lock);
1399         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1400                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1401                 err = 0;
1402         }
1403         spin_unlock(&ifp->state_lock);
1404
1405         return err;
1406 }
1407
1408 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1409 {
1410         struct inet6_dev *idev = ifp->idev;
1411
1412         if (addrconf_dad_end(ifp)) {
1413                 in6_ifa_put(ifp);
1414                 return;
1415         }
1416
1417         if (net_ratelimit())
1418                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1419                         ifp->idev->dev->name, &ifp->addr);
1420
1421         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1422                 struct in6_addr addr;
1423
1424                 addr.s6_addr32[0] = htonl(0xfe800000);
1425                 addr.s6_addr32[1] = 0;
1426
1427                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1428                     ipv6_addr_equal(&ifp->addr, &addr)) {
1429                         /* DAD failed for link-local based on MAC address */
1430                         idev->cnf.disable_ipv6 = 1;
1431
1432                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1433                                 ifp->idev->dev->name);
1434                 }
1435         }
1436
1437         addrconf_dad_stop(ifp, 1);
1438 }
1439
1440 /* Join to solicited addr multicast group. */
1441
1442 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1443 {
1444         struct in6_addr maddr;
1445
1446         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1447                 return;
1448
1449         addrconf_addr_solict_mult(addr, &maddr);
1450         ipv6_dev_mc_inc(dev, &maddr);
1451 }
1452
1453 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1454 {
1455         struct in6_addr maddr;
1456
1457         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1458                 return;
1459
1460         addrconf_addr_solict_mult(addr, &maddr);
1461         __ipv6_dev_mc_dec(idev, &maddr);
1462 }
1463
1464 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1465 {
1466         struct in6_addr addr;
1467         if (ifp->prefix_len == 127) /* RFC 6164 */
1468                 return;
1469         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1470         if (ipv6_addr_any(&addr))
1471                 return;
1472         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1473 }
1474
1475 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1476 {
1477         struct in6_addr addr;
1478         if (ifp->prefix_len == 127) /* RFC 6164 */
1479                 return;
1480         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1481         if (ipv6_addr_any(&addr))
1482                 return;
1483         __ipv6_dev_ac_dec(ifp->idev, &addr);
1484 }
1485
1486 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1487 {
1488         if (dev->addr_len != ETH_ALEN)
1489                 return -1;
1490         memcpy(eui, dev->dev_addr, 3);
1491         memcpy(eui + 5, dev->dev_addr + 3, 3);
1492
1493         /*
1494          * The zSeries OSA network cards can be shared among various
1495          * OS instances, but the OSA cards have only one MAC address.
1496          * This leads to duplicate address conflicts in conjunction
1497          * with IPv6 if more than one instance uses the same card.
1498          *
1499          * The driver for these cards can deliver a unique 16-bit
1500          * identifier for each instance sharing the same card.  It is
1501          * placed instead of 0xFFFE in the interface identifier.  The
1502          * "u" bit of the interface identifier is not inverted in this
1503          * case.  Hence the resulting interface identifier has local
1504          * scope according to RFC2373.
1505          */
1506         if (dev->dev_id) {
1507                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1508                 eui[4] = dev->dev_id & 0xFF;
1509         } else {
1510                 eui[3] = 0xFF;
1511                 eui[4] = 0xFE;
1512                 eui[0] ^= 2;
1513         }
1514         return 0;
1515 }
1516
1517 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1518 {
1519         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1520         if (dev->addr_len != ARCNET_ALEN)
1521                 return -1;
1522         memset(eui, 0, 7);
1523         eui[7] = *(u8*)dev->dev_addr;
1524         return 0;
1525 }
1526
1527 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1528 {
1529         if (dev->addr_len != INFINIBAND_ALEN)
1530                 return -1;
1531         memcpy(eui, dev->dev_addr + 12, 8);
1532         eui[0] |= 2;
1533         return 0;
1534 }
1535
1536 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1537 {
1538         if (addr == 0)
1539                 return -1;
1540         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1541                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1542                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1543                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1544                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1545                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1546         eui[1] = 0;
1547         eui[2] = 0x5E;
1548         eui[3] = 0xFE;
1549         memcpy(eui + 4, &addr, 4);
1550         return 0;
1551 }
1552
1553 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1554 {
1555         if (dev->priv_flags & IFF_ISATAP)
1556                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1557         return -1;
1558 }
1559
1560 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1561 {
1562         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563 }
1564
1565 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1566 {
1567         switch (dev->type) {
1568         case ARPHRD_ETHER:
1569         case ARPHRD_FDDI:
1570         case ARPHRD_IEEE802_TR:
1571                 return addrconf_ifid_eui48(eui, dev);
1572         case ARPHRD_ARCNET:
1573                 return addrconf_ifid_arcnet(eui, dev);
1574         case ARPHRD_INFINIBAND:
1575                 return addrconf_ifid_infiniband(eui, dev);
1576         case ARPHRD_SIT:
1577                 return addrconf_ifid_sit(eui, dev);
1578         case ARPHRD_IPGRE:
1579                 return addrconf_ifid_gre(eui, dev);
1580         }
1581         return -1;
1582 }
1583
1584 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1585 {
1586         int err = -1;
1587         struct inet6_ifaddr *ifp;
1588
1589         read_lock_bh(&idev->lock);
1590         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1591                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1592                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1593                         err = 0;
1594                         break;
1595                 }
1596         }
1597         read_unlock_bh(&idev->lock);
1598         return err;
1599 }
1600
1601 #ifdef CONFIG_IPV6_PRIVACY
1602 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1603 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1604 {
1605 regen:
1606         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1607         idev->rndid[0] &= ~0x02;
1608
1609         /*
1610          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1611          * check if generated address is not inappropriate
1612          *
1613          *  - Reserved subnet anycast (RFC 2526)
1614          *      11111101 11....11 1xxxxxxx
1615          *  - ISATAP (RFC4214) 6.1
1616          *      00-00-5E-FE-xx-xx-xx-xx
1617          *  - value 0
1618          *  - XXX: already assigned to an address on the device
1619          */
1620         if (idev->rndid[0] == 0xfd &&
1621             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1622             (idev->rndid[7]&0x80))
1623                 goto regen;
1624         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1625                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1626                         goto regen;
1627                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1628                         goto regen;
1629         }
1630
1631         return 0;
1632 }
1633
1634 static void ipv6_regen_rndid(unsigned long data)
1635 {
1636         struct inet6_dev *idev = (struct inet6_dev *) data;
1637         unsigned long expires;
1638
1639         rcu_read_lock_bh();
1640         write_lock_bh(&idev->lock);
1641
1642         if (idev->dead)
1643                 goto out;
1644
1645         if (__ipv6_regen_rndid(idev) < 0)
1646                 goto out;
1647
1648         expires = jiffies +
1649                 idev->cnf.temp_prefered_lft * HZ -
1650                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1651                 idev->cnf.max_desync_factor * HZ;
1652         if (time_before(expires, jiffies)) {
1653                 printk(KERN_WARNING
1654                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1655                         idev->dev->name);
1656                 goto out;
1657         }
1658
1659         if (!mod_timer(&idev->regen_timer, expires))
1660                 in6_dev_hold(idev);
1661
1662 out:
1663         write_unlock_bh(&idev->lock);
1664         rcu_read_unlock_bh();
1665         in6_dev_put(idev);
1666 }
1667
1668 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1669         int ret = 0;
1670
1671         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1672                 ret = __ipv6_regen_rndid(idev);
1673         return ret;
1674 }
1675 #endif
1676
1677 /*
1678  *      Add prefix route.
1679  */
1680
1681 static void
1682 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1683                       unsigned long expires, u32 flags)
1684 {
1685         struct fib6_config cfg = {
1686                 .fc_table = RT6_TABLE_PREFIX,
1687                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1688                 .fc_ifindex = dev->ifindex,
1689                 .fc_expires = expires,
1690                 .fc_dst_len = plen,
1691                 .fc_flags = RTF_UP | flags,
1692                 .fc_nlinfo.nl_net = dev_net(dev),
1693                 .fc_protocol = RTPROT_KERNEL,
1694         };
1695
1696         cfg.fc_dst = *pfx;
1697
1698         /* Prevent useless cloning on PtP SIT.
1699            This thing is done here expecting that the whole
1700            class of non-broadcast devices need not cloning.
1701          */
1702 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1703         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1704                 cfg.fc_flags |= RTF_NONEXTHOP;
1705 #endif
1706
1707         ip6_route_add(&cfg);
1708 }
1709
1710
1711 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1712                                                   int plen,
1713                                                   const struct net_device *dev,
1714                                                   u32 flags, u32 noflags)
1715 {
1716         struct fib6_node *fn;
1717         struct rt6_info *rt = NULL;
1718         struct fib6_table *table;
1719
1720         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1721         if (table == NULL)
1722                 return NULL;
1723
1724         write_lock_bh(&table->tb6_lock);
1725         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1726         if (!fn)
1727                 goto out;
1728         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1729                 if (rt->dst.dev->ifindex != dev->ifindex)
1730                         continue;
1731                 if ((rt->rt6i_flags & flags) != flags)
1732                         continue;
1733                 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1734                         continue;
1735                 dst_hold(&rt->dst);
1736                 break;
1737         }
1738 out:
1739         write_unlock_bh(&table->tb6_lock);
1740         return rt;
1741 }
1742
1743
1744 /* Create "default" multicast route to the interface */
1745
1746 static void addrconf_add_mroute(struct net_device *dev)
1747 {
1748         struct fib6_config cfg = {
1749                 .fc_table = RT6_TABLE_LOCAL,
1750                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1751                 .fc_ifindex = dev->ifindex,
1752                 .fc_dst_len = 8,
1753                 .fc_flags = RTF_UP,
1754                 .fc_nlinfo.nl_net = dev_net(dev),
1755         };
1756
1757         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1758
1759         ip6_route_add(&cfg);
1760 }
1761
1762 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1763 static void sit_route_add(struct net_device *dev)
1764 {
1765         struct fib6_config cfg = {
1766                 .fc_table = RT6_TABLE_MAIN,
1767                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1768                 .fc_ifindex = dev->ifindex,
1769                 .fc_dst_len = 96,
1770                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1771                 .fc_nlinfo.nl_net = dev_net(dev),
1772         };
1773
1774         /* prefix length - 96 bits "::d.d.d.d" */
1775         ip6_route_add(&cfg);
1776 }
1777 #endif
1778
1779 static void addrconf_add_lroute(struct net_device *dev)
1780 {
1781         struct in6_addr addr;
1782
1783         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1784         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1785 }
1786
1787 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1788 {
1789         struct inet6_dev *idev;
1790
1791         ASSERT_RTNL();
1792
1793         idev = ipv6_find_idev(dev);
1794         if (!idev)
1795                 return ERR_PTR(-ENOBUFS);
1796
1797         if (idev->cnf.disable_ipv6)
1798                 return ERR_PTR(-EACCES);
1799
1800         /* Add default multicast route */
1801         if (!(dev->flags & IFF_LOOPBACK))
1802                 addrconf_add_mroute(dev);
1803
1804         /* Add link local route */
1805         addrconf_add_lroute(dev);
1806         return idev;
1807 }
1808
1809 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1810 {
1811         struct prefix_info *pinfo;
1812         __u32 valid_lft;
1813         __u32 prefered_lft;
1814         int addr_type;
1815         struct inet6_dev *in6_dev;
1816         struct net *net = dev_net(dev);
1817
1818         pinfo = (struct prefix_info *) opt;
1819
1820         if (len < sizeof(struct prefix_info)) {
1821                 ADBG(("addrconf: prefix option too short\n"));
1822                 return;
1823         }
1824
1825         /*
1826          *      Validation checks ([ADDRCONF], page 19)
1827          */
1828
1829         addr_type = ipv6_addr_type(&pinfo->prefix);
1830
1831         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1832                 return;
1833
1834         valid_lft = ntohl(pinfo->valid);
1835         prefered_lft = ntohl(pinfo->prefered);
1836
1837         if (prefered_lft > valid_lft) {
1838                 if (net_ratelimit())
1839                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1840                 return;
1841         }
1842
1843         in6_dev = in6_dev_get(dev);
1844
1845         if (in6_dev == NULL) {
1846                 if (net_ratelimit())
1847                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1848                 return;
1849         }
1850
1851         /*
1852          *      Two things going on here:
1853          *      1) Add routes for on-link prefixes
1854          *      2) Configure prefixes with the auto flag set
1855          */
1856
1857         if (pinfo->onlink) {
1858                 struct rt6_info *rt;
1859                 unsigned long rt_expires;
1860
1861                 /* Avoid arithmetic overflow. Really, we could
1862                  * save rt_expires in seconds, likely valid_lft,
1863                  * but it would require division in fib gc, that it
1864                  * not good.
1865                  */
1866                 if (HZ > USER_HZ)
1867                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1868                 else
1869                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1870
1871                 if (addrconf_finite_timeout(rt_expires))
1872                         rt_expires *= HZ;
1873
1874                 rt = addrconf_get_prefix_route(&pinfo->prefix,
1875                                                pinfo->prefix_len,
1876                                                dev,
1877                                                RTF_ADDRCONF | RTF_PREFIX_RT,
1878                                                RTF_GATEWAY | RTF_DEFAULT);
1879
1880                 if (rt) {
1881                         /* Autoconf prefix route */
1882                         if (valid_lft == 0) {
1883                                 ip6_del_rt(rt);
1884                                 rt = NULL;
1885                         } else if (addrconf_finite_timeout(rt_expires)) {
1886                                 /* not infinity */
1887                                 rt6_set_expires(rt, jiffies + rt_expires);
1888                         } else {
1889                                 rt6_clean_expires(rt);
1890                         }
1891                 } else if (valid_lft) {
1892                         clock_t expires = 0;
1893                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1894                         if (addrconf_finite_timeout(rt_expires)) {
1895                                 /* not infinity */
1896                                 flags |= RTF_EXPIRES;
1897                                 expires = jiffies_to_clock_t(rt_expires);
1898                         }
1899                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1900                                               dev, expires, flags);
1901                 }
1902                 if (rt)
1903                         dst_release(&rt->dst);
1904         }
1905
1906         /* Try to figure out our local address for this prefix */
1907
1908         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1909                 struct inet6_ifaddr * ifp;
1910                 struct in6_addr addr;
1911                 int create = 0, update_lft = 0;
1912
1913                 if (pinfo->prefix_len == 64) {
1914                         memcpy(&addr, &pinfo->prefix, 8);
1915                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1916                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1917                                 in6_dev_put(in6_dev);
1918                                 return;
1919                         }
1920                         goto ok;
1921                 }
1922                 if (net_ratelimit())
1923                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1924                                pinfo->prefix_len);
1925                 in6_dev_put(in6_dev);
1926                 return;
1927
1928 ok:
1929
1930                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1931
1932                 if (ifp == NULL && valid_lft) {
1933                         int max_addresses = in6_dev->cnf.max_addresses;
1934                         u32 addr_flags = 0;
1935
1936 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1937                         if (in6_dev->cnf.optimistic_dad &&
1938                             !net->ipv6.devconf_all->forwarding && sllao)
1939                                 addr_flags = IFA_F_OPTIMISTIC;
1940 #endif
1941
1942                         /* Do not allow to create too much of autoconfigured
1943                          * addresses; this would be too easy way to crash kernel.
1944                          */
1945                         if (!max_addresses ||
1946                             ipv6_count_addresses(in6_dev) < max_addresses)
1947                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1948                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1949                                                     addr_flags);
1950
1951                         if (!ifp || IS_ERR(ifp)) {
1952                                 in6_dev_put(in6_dev);
1953                                 return;
1954                         }
1955
1956                         update_lft = create = 1;
1957                         ifp->cstamp = jiffies;
1958                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1959                 }
1960
1961                 if (ifp) {
1962                         int flags;
1963                         unsigned long now;
1964 #ifdef CONFIG_IPV6_PRIVACY
1965                         struct inet6_ifaddr *ift;
1966 #endif
1967                         u32 stored_lft;
1968
1969                         /* update lifetime (RFC2462 5.5.3 e) */
1970                         spin_lock(&ifp->lock);
1971                         now = jiffies;
1972                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1973                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1974                         else
1975                                 stored_lft = 0;
1976                         if (!update_lft && stored_lft) {
1977                                 if (valid_lft > MIN_VALID_LIFETIME ||
1978                                     valid_lft > stored_lft)
1979                                         update_lft = 1;
1980                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1981                                         /* valid_lft <= stored_lft is always true */
1982                                         /*
1983                                          * RFC 4862 Section 5.5.3e:
1984                                          * "Note that the preferred lifetime of
1985                                          *  the corresponding address is always
1986                                          *  reset to the Preferred Lifetime in
1987                                          *  the received Prefix Information
1988                                          *  option, regardless of whether the
1989                                          *  valid lifetime is also reset or
1990                                          *  ignored."
1991                                          *
1992                                          *  So if the preferred lifetime in
1993                                          *  this advertisement is different
1994                                          *  than what we have stored, but the
1995                                          *  valid lifetime is invalid, just
1996                                          *  reset prefered_lft.
1997                                          *
1998                                          *  We must set the valid lifetime
1999                                          *  to the stored lifetime since we'll
2000                                          *  be updating the timestamp below,
2001                                          *  else we'll set it back to the
2002                                          *  minimum.
2003                                          */
2004                                         if (prefered_lft != ifp->prefered_lft) {
2005                                                 valid_lft = stored_lft;
2006                                                 update_lft = 1;
2007                                         }
2008                                 } else {
2009                                         valid_lft = MIN_VALID_LIFETIME;
2010                                         if (valid_lft < prefered_lft)
2011                                                 prefered_lft = valid_lft;
2012                                         update_lft = 1;
2013                                 }
2014                         }
2015
2016                         if (update_lft) {
2017                                 ifp->valid_lft = valid_lft;
2018                                 ifp->prefered_lft = prefered_lft;
2019                                 ifp->tstamp = now;
2020                                 flags = ifp->flags;
2021                                 ifp->flags &= ~IFA_F_DEPRECATED;
2022                                 spin_unlock(&ifp->lock);
2023
2024                                 if (!(flags&IFA_F_TENTATIVE))
2025                                         ipv6_ifa_notify(0, ifp);
2026                         } else
2027                                 spin_unlock(&ifp->lock);
2028
2029 #ifdef CONFIG_IPV6_PRIVACY
2030                         read_lock_bh(&in6_dev->lock);
2031                         /* update all temporary addresses in the list */
2032                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2033                                             tmp_list) {
2034                                 int age, max_valid, max_prefered;
2035
2036                                 if (ifp != ift->ifpub)
2037                                         continue;
2038
2039                                 /*
2040                                  * RFC 4941 section 3.3:
2041                                  * If a received option will extend the lifetime
2042                                  * of a public address, the lifetimes of
2043                                  * temporary addresses should be extended,
2044                                  * subject to the overall constraint that no
2045                                  * temporary addresses should ever remain
2046                                  * "valid" or "preferred" for a time longer than
2047                                  * (TEMP_VALID_LIFETIME) or
2048                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2049                                  * respectively.
2050                                  */
2051                                 age = (now - ift->cstamp) / HZ;
2052                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2053                                 if (max_valid < 0)
2054                                         max_valid = 0;
2055
2056                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2057                                                in6_dev->cnf.max_desync_factor -
2058                                                age;
2059                                 if (max_prefered < 0)
2060                                         max_prefered = 0;
2061
2062                                 if (valid_lft > max_valid)
2063                                         valid_lft = max_valid;
2064
2065                                 if (prefered_lft > max_prefered)
2066                                         prefered_lft = max_prefered;
2067
2068                                 spin_lock(&ift->lock);
2069                                 flags = ift->flags;
2070                                 ift->valid_lft = valid_lft;
2071                                 ift->prefered_lft = prefered_lft;
2072                                 ift->tstamp = now;
2073                                 if (prefered_lft > 0)
2074                                         ift->flags &= ~IFA_F_DEPRECATED;
2075
2076                                 spin_unlock(&ift->lock);
2077                                 if (!(flags&IFA_F_TENTATIVE))
2078                                         ipv6_ifa_notify(0, ift);
2079                         }
2080
2081                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2082                                 /*
2083                                  * When a new public address is created as
2084                                  * described in [ADDRCONF], also create a new
2085                                  * temporary address. Also create a temporary
2086                                  * address if it's enabled but no temporary
2087                                  * address currently exists.
2088                                  */
2089                                 read_unlock_bh(&in6_dev->lock);
2090                                 ipv6_create_tempaddr(ifp, NULL);
2091                         } else {
2092                                 read_unlock_bh(&in6_dev->lock);
2093                         }
2094 #endif
2095                         in6_ifa_put(ifp);
2096                         addrconf_verify(0);
2097                 }
2098         }
2099         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2100         in6_dev_put(in6_dev);
2101 }
2102
2103 /*
2104  *      Set destination address.
2105  *      Special case for SIT interfaces where we create a new "virtual"
2106  *      device.
2107  */
2108 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2109 {
2110         struct in6_ifreq ireq;
2111         struct net_device *dev;
2112         int err = -EINVAL;
2113
2114         rtnl_lock();
2115
2116         err = -EFAULT;
2117         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2118                 goto err_exit;
2119
2120         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2121
2122         err = -ENODEV;
2123         if (dev == NULL)
2124                 goto err_exit;
2125
2126 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2127         if (dev->type == ARPHRD_SIT) {
2128                 const struct net_device_ops *ops = dev->netdev_ops;
2129                 struct ifreq ifr;
2130                 struct ip_tunnel_parm p;
2131
2132                 err = -EADDRNOTAVAIL;
2133                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2134                         goto err_exit;
2135
2136                 memset(&p, 0, sizeof(p));
2137                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2138                 p.iph.saddr = 0;
2139                 p.iph.version = 4;
2140                 p.iph.ihl = 5;
2141                 p.iph.protocol = IPPROTO_IPV6;
2142                 p.iph.ttl = 64;
2143                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2144
2145                 if (ops->ndo_do_ioctl) {
2146                         mm_segment_t oldfs = get_fs();
2147
2148                         set_fs(KERNEL_DS);
2149                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2150                         set_fs(oldfs);
2151                 } else
2152                         err = -EOPNOTSUPP;
2153
2154                 if (err == 0) {
2155                         err = -ENOBUFS;
2156                         dev = __dev_get_by_name(net, p.name);
2157                         if (!dev)
2158                                 goto err_exit;
2159                         err = dev_open(dev);
2160                 }
2161         }
2162 #endif
2163
2164 err_exit:
2165         rtnl_unlock();
2166         return err;
2167 }
2168
2169 /*
2170  *      Manual configuration of address on an interface
2171  */
2172 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2173                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2174                           __u32 valid_lft)
2175 {
2176         struct inet6_ifaddr *ifp;
2177         struct inet6_dev *idev;
2178         struct net_device *dev;
2179         int scope;
2180         u32 flags;
2181         clock_t expires;
2182         unsigned long timeout;
2183
2184         ASSERT_RTNL();
2185
2186         if (plen > 128)
2187                 return -EINVAL;
2188
2189         /* check the lifetime */
2190         if (!valid_lft || prefered_lft > valid_lft)
2191                 return -EINVAL;
2192
2193         dev = __dev_get_by_index(net, ifindex);
2194         if (!dev)
2195                 return -ENODEV;
2196
2197         idev = addrconf_add_dev(dev);
2198         if (IS_ERR(idev))
2199                 return PTR_ERR(idev);
2200
2201         scope = ipv6_addr_scope(pfx);
2202
2203         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2204         if (addrconf_finite_timeout(timeout)) {
2205                 expires = jiffies_to_clock_t(timeout * HZ);
2206                 valid_lft = timeout;
2207                 flags = RTF_EXPIRES;
2208         } else {
2209                 expires = 0;
2210                 flags = 0;
2211                 ifa_flags |= IFA_F_PERMANENT;
2212         }
2213
2214         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2215         if (addrconf_finite_timeout(timeout)) {
2216                 if (timeout == 0)
2217                         ifa_flags |= IFA_F_DEPRECATED;
2218                 prefered_lft = timeout;
2219         }
2220
2221         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2222
2223         if (!IS_ERR(ifp)) {
2224                 spin_lock_bh(&ifp->lock);
2225                 ifp->valid_lft = valid_lft;
2226                 ifp->prefered_lft = prefered_lft;
2227                 ifp->tstamp = jiffies;
2228                 spin_unlock_bh(&ifp->lock);
2229
2230                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2231                                       expires, flags);
2232                 /*
2233                  * Note that section 3.1 of RFC 4429 indicates
2234                  * that the Optimistic flag should not be set for
2235                  * manually configured addresses
2236                  */
2237                 addrconf_dad_start(ifp, 0);
2238                 in6_ifa_put(ifp);
2239                 addrconf_verify(0);
2240                 return 0;
2241         }
2242
2243         return PTR_ERR(ifp);
2244 }
2245
2246 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2247                           unsigned int plen)
2248 {
2249         struct inet6_ifaddr *ifp;
2250         struct inet6_dev *idev;
2251         struct net_device *dev;
2252
2253         if (plen > 128)
2254                 return -EINVAL;
2255
2256         dev = __dev_get_by_index(net, ifindex);
2257         if (!dev)
2258                 return -ENODEV;
2259
2260         if ((idev = __in6_dev_get(dev)) == NULL)
2261                 return -ENXIO;
2262
2263         read_lock_bh(&idev->lock);
2264         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2265                 if (ifp->prefix_len == plen &&
2266                     ipv6_addr_equal(pfx, &ifp->addr)) {
2267                         in6_ifa_hold(ifp);
2268                         read_unlock_bh(&idev->lock);
2269
2270                         ipv6_del_addr(ifp);
2271
2272                         /* If the last address is deleted administratively,
2273                            disable IPv6 on this interface.
2274                          */
2275                         if (list_empty(&idev->addr_list))
2276                                 addrconf_ifdown(idev->dev, 1);
2277                         return 0;
2278                 }
2279         }
2280         read_unlock_bh(&idev->lock);
2281         return -EADDRNOTAVAIL;
2282 }
2283
2284
2285 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2286 {
2287         struct in6_ifreq ireq;
2288         int err;
2289
2290         if (!capable(CAP_NET_ADMIN))
2291                 return -EPERM;
2292
2293         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2294                 return -EFAULT;
2295
2296         rtnl_lock();
2297         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2298                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2299                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2300         rtnl_unlock();
2301         return err;
2302 }
2303
2304 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2305 {
2306         struct in6_ifreq ireq;
2307         int err;
2308
2309         if (!capable(CAP_NET_ADMIN))
2310                 return -EPERM;
2311
2312         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2313                 return -EFAULT;
2314
2315         rtnl_lock();
2316         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2317                              ireq.ifr6_prefixlen);
2318         rtnl_unlock();
2319         return err;
2320 }
2321
2322 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2323                      int plen, int scope)
2324 {
2325         struct inet6_ifaddr *ifp;
2326
2327         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2328         if (!IS_ERR(ifp)) {
2329                 spin_lock_bh(&ifp->lock);
2330                 ifp->flags &= ~IFA_F_TENTATIVE;
2331                 spin_unlock_bh(&ifp->lock);
2332                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2333                 in6_ifa_put(ifp);
2334         }
2335 }
2336
2337 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2338 static void sit_add_v4_addrs(struct inet6_dev *idev)
2339 {
2340         struct in6_addr addr;
2341         struct net_device *dev;
2342         struct net *net = dev_net(idev->dev);
2343         int scope;
2344
2345         ASSERT_RTNL();
2346
2347         memset(&addr, 0, sizeof(struct in6_addr));
2348         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2349
2350         if (idev->dev->flags&IFF_POINTOPOINT) {
2351                 addr.s6_addr32[0] = htonl(0xfe800000);
2352                 scope = IFA_LINK;
2353         } else {
2354                 scope = IPV6_ADDR_COMPATv4;
2355         }
2356
2357         if (addr.s6_addr32[3]) {
2358                 add_addr(idev, &addr, 128, scope);
2359                 return;
2360         }
2361
2362         for_each_netdev(net, dev) {
2363                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2364                 if (in_dev && (dev->flags & IFF_UP)) {
2365                         struct in_ifaddr * ifa;
2366
2367                         int flag = scope;
2368
2369                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2370                                 int plen;
2371
2372                                 addr.s6_addr32[3] = ifa->ifa_local;
2373
2374                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2375                                         continue;
2376                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2377                                         if (idev->dev->flags&IFF_POINTOPOINT)
2378                                                 continue;
2379                                         flag |= IFA_HOST;
2380                                 }
2381                                 if (idev->dev->flags&IFF_POINTOPOINT)
2382                                         plen = 64;
2383                                 else
2384                                         plen = 96;
2385
2386                                 add_addr(idev, &addr, plen, flag);
2387                         }
2388                 }
2389         }
2390 }
2391 #endif
2392
2393 static void init_loopback(struct net_device *dev)
2394 {
2395         struct inet6_dev  *idev;
2396
2397         /* ::1 */
2398
2399         ASSERT_RTNL();
2400
2401         if ((idev = ipv6_find_idev(dev)) == NULL) {
2402                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2403                 return;
2404         }
2405
2406         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2407 }
2408
2409 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2410 {
2411         struct inet6_ifaddr * ifp;
2412         u32 addr_flags = IFA_F_PERMANENT;
2413
2414 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2415         if (idev->cnf.optimistic_dad &&
2416             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2417                 addr_flags |= IFA_F_OPTIMISTIC;
2418 #endif
2419
2420
2421         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2422         if (!IS_ERR(ifp)) {
2423                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2424                 addrconf_dad_start(ifp, 0);
2425                 in6_ifa_put(ifp);
2426         }
2427 }
2428
2429 static void addrconf_dev_config(struct net_device *dev)
2430 {
2431         struct in6_addr addr;
2432         struct inet6_dev    * idev;
2433
2434         ASSERT_RTNL();
2435
2436         if ((dev->type != ARPHRD_ETHER) &&
2437             (dev->type != ARPHRD_FDDI) &&
2438             (dev->type != ARPHRD_IEEE802_TR) &&
2439             (dev->type != ARPHRD_ARCNET) &&
2440             (dev->type != ARPHRD_INFINIBAND)) {
2441                 /* Alas, we support only Ethernet autoconfiguration. */
2442                 return;
2443         }
2444
2445         idev = addrconf_add_dev(dev);
2446         if (IS_ERR(idev))
2447                 return;
2448
2449         memset(&addr, 0, sizeof(struct in6_addr));
2450         addr.s6_addr32[0] = htonl(0xFE800000);
2451
2452         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2453                 addrconf_add_linklocal(idev, &addr);
2454 }
2455
2456 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2457 static void addrconf_sit_config(struct net_device *dev)
2458 {
2459         struct inet6_dev *idev;
2460
2461         ASSERT_RTNL();
2462
2463         /*
2464          * Configure the tunnel with one of our IPv4
2465          * addresses... we should configure all of
2466          * our v4 addrs in the tunnel
2467          */
2468
2469         if ((idev = ipv6_find_idev(dev)) == NULL) {
2470                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2471                 return;
2472         }
2473
2474         if (dev->priv_flags & IFF_ISATAP) {
2475                 struct in6_addr addr;
2476
2477                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2478                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2479                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2480                         addrconf_add_linklocal(idev, &addr);
2481                 return;
2482         }
2483
2484         sit_add_v4_addrs(idev);
2485
2486         if (dev->flags&IFF_POINTOPOINT) {
2487                 addrconf_add_mroute(dev);
2488                 addrconf_add_lroute(dev);
2489         } else
2490                 sit_route_add(dev);
2491 }
2492 #endif
2493
2494 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2495 static void addrconf_gre_config(struct net_device *dev)
2496 {
2497         struct inet6_dev *idev;
2498         struct in6_addr addr;
2499
2500         pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2501
2502         ASSERT_RTNL();
2503
2504         if ((idev = ipv6_find_idev(dev)) == NULL) {
2505                 printk(KERN_DEBUG "init gre: add_dev failed\n");
2506                 return;
2507         }
2508
2509         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2510         addrconf_prefix_route(&addr, 64, dev, 0, 0);
2511
2512         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2513                 addrconf_add_linklocal(idev, &addr);
2514 }
2515 #endif
2516
2517 static inline int
2518 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2519 {
2520         struct in6_addr lladdr;
2521
2522         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2523                 addrconf_add_linklocal(idev, &lladdr);
2524                 return 0;
2525         }
2526         return -1;
2527 }
2528
2529 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2530 {
2531         struct net_device *link_dev;
2532         struct net *net = dev_net(idev->dev);
2533
2534         /* first try to inherit the link-local address from the link device */
2535         if (idev->dev->iflink &&
2536             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2537                 if (!ipv6_inherit_linklocal(idev, link_dev))
2538                         return;
2539         }
2540         /* then try to inherit it from any device */
2541         for_each_netdev(net, link_dev) {
2542                 if (!ipv6_inherit_linklocal(idev, link_dev))
2543                         return;
2544         }
2545         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2546 }
2547
2548 /*
2549  * Autoconfigure tunnel with a link-local address so routing protocols,
2550  * DHCPv6, MLD etc. can be run over the virtual link
2551  */
2552
2553 static void addrconf_ip6_tnl_config(struct net_device *dev)
2554 {
2555         struct inet6_dev *idev;
2556
2557         ASSERT_RTNL();
2558
2559         idev = addrconf_add_dev(dev);
2560         if (IS_ERR(idev)) {
2561                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2562                 return;
2563         }
2564         ip6_tnl_add_linklocal(idev);
2565 }
2566
2567 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2568                            void * data)
2569 {
2570         struct net_device *dev = (struct net_device *) data;
2571         struct inet6_dev *idev = __in6_dev_get(dev);
2572         int run_pending = 0;
2573         int err;
2574
2575         switch (event) {
2576         case NETDEV_REGISTER:
2577                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2578                         idev = ipv6_add_dev(dev);
2579                         if (!idev)
2580                                 return notifier_from_errno(-ENOMEM);
2581                 }
2582                 break;
2583
2584         case NETDEV_UP:
2585         case NETDEV_CHANGE:
2586                 if (dev->flags & IFF_SLAVE)
2587                         break;
2588
2589                 if (event == NETDEV_UP) {
2590                         if (!addrconf_qdisc_ok(dev)) {
2591                                 /* device is not ready yet. */
2592                                 printk(KERN_INFO
2593                                         "ADDRCONF(NETDEV_UP): %s: "
2594                                         "link is not ready\n",
2595                                         dev->name);
2596                                 break;
2597                         }
2598
2599                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2600                                 idev = ipv6_add_dev(dev);
2601
2602                         if (idev) {
2603                                 idev->if_flags |= IF_READY;
2604                                 run_pending = 1;
2605                         }
2606                 } else {
2607                         if (!addrconf_qdisc_ok(dev)) {
2608                                 /* device is still not ready. */
2609                                 break;
2610                         }
2611
2612                         if (idev) {
2613                                 if (idev->if_flags & IF_READY)
2614                                         /* device is already configured. */
2615                                         break;
2616                                 idev->if_flags |= IF_READY;
2617                         }
2618
2619                         printk(KERN_INFO
2620                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2621                                         "link becomes ready\n",
2622                                         dev->name);
2623
2624                         run_pending = 1;
2625                 }
2626
2627                 switch (dev->type) {
2628 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2629                 case ARPHRD_SIT:
2630                         addrconf_sit_config(dev);
2631                         break;
2632 #endif
2633 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2634                 case ARPHRD_IPGRE:
2635                         addrconf_gre_config(dev);
2636                         break;
2637 #endif
2638                 case ARPHRD_TUNNEL6:
2639                         addrconf_ip6_tnl_config(dev);
2640                         break;
2641                 case ARPHRD_LOOPBACK:
2642                         init_loopback(dev);
2643                         break;
2644
2645                 default:
2646                         addrconf_dev_config(dev);
2647                         break;
2648                 }
2649
2650                 if (idev) {
2651                         if (run_pending)
2652                                 addrconf_dad_run(idev);
2653
2654                         /*
2655                          * If the MTU changed during the interface down,
2656                          * when the interface up, the changed MTU must be
2657                          * reflected in the idev as well as routers.
2658                          */
2659                         if (idev->cnf.mtu6 != dev->mtu &&
2660                             dev->mtu >= IPV6_MIN_MTU) {
2661                                 rt6_mtu_change(dev, dev->mtu);
2662                                 idev->cnf.mtu6 = dev->mtu;
2663                         }
2664                         idev->tstamp = jiffies;
2665                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2666
2667                         /*
2668                          * If the changed mtu during down is lower than
2669                          * IPV6_MIN_MTU stop IPv6 on this interface.
2670                          */
2671                         if (dev->mtu < IPV6_MIN_MTU)
2672                                 addrconf_ifdown(dev, 1);
2673                 }
2674                 break;
2675
2676         case NETDEV_CHANGEMTU:
2677                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2678                         rt6_mtu_change(dev, dev->mtu);
2679                         idev->cnf.mtu6 = dev->mtu;
2680                         break;
2681                 }
2682
2683                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2684                         idev = ipv6_add_dev(dev);
2685                         if (idev)
2686                                 break;
2687                 }
2688
2689                 /*
2690                  * MTU falled under IPV6_MIN_MTU.
2691                  * Stop IPv6 on this interface.
2692                  */
2693
2694         case NETDEV_DOWN:
2695         case NETDEV_UNREGISTER:
2696                 /*
2697                  *      Remove all addresses from this interface.
2698                  */
2699                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2700                 break;
2701
2702         case NETDEV_CHANGENAME:
2703                 if (idev) {
2704                         snmp6_unregister_dev(idev);
2705                         addrconf_sysctl_unregister(idev);
2706                         addrconf_sysctl_register(idev);
2707                         err = snmp6_register_dev(idev);
2708                         if (err)
2709                                 return notifier_from_errno(err);
2710                 }
2711                 break;
2712
2713         case NETDEV_PRE_TYPE_CHANGE:
2714         case NETDEV_POST_TYPE_CHANGE:
2715                 addrconf_type_change(dev, event);
2716                 break;
2717         }
2718
2719         return NOTIFY_OK;
2720 }
2721
2722 /*
2723  *      addrconf module should be notified of a device going up
2724  */
2725 static struct notifier_block ipv6_dev_notf = {
2726         .notifier_call = addrconf_notify,
2727 };
2728
2729 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2730 {
2731         struct inet6_dev *idev;
2732         ASSERT_RTNL();
2733
2734         idev = __in6_dev_get(dev);
2735
2736         if (event == NETDEV_POST_TYPE_CHANGE)
2737                 ipv6_mc_remap(idev);
2738         else if (event == NETDEV_PRE_TYPE_CHANGE)
2739                 ipv6_mc_unmap(idev);
2740 }
2741
2742 static int addrconf_ifdown(struct net_device *dev, int how)
2743 {
2744         struct net *net = dev_net(dev);
2745         struct inet6_dev *idev;
2746         struct inet6_ifaddr *ifa;
2747         int state, i;
2748
2749         ASSERT_RTNL();
2750
2751         rt6_ifdown(net, dev);
2752         neigh_ifdown(&nd_tbl, dev);
2753
2754         idev = __in6_dev_get(dev);
2755         if (idev == NULL)
2756                 return -ENODEV;
2757
2758         /*
2759          * Step 1: remove reference to ipv6 device from parent device.
2760          *         Do not dev_put!
2761          */
2762         if (how) {
2763                 idev->dead = 1;
2764
2765                 /* protected by rtnl_lock */
2766                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2767
2768                 /* Step 1.5: remove snmp6 entry */
2769                 snmp6_unregister_dev(idev);
2770
2771         }
2772
2773         /* Step 2: clear hash table */
2774         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2775                 struct hlist_head *h = &inet6_addr_lst[i];
2776                 struct hlist_node *n;
2777
2778                 spin_lock_bh(&addrconf_hash_lock);
2779         restart:
2780                 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2781                         if (ifa->idev == idev) {
2782                                 hlist_del_init_rcu(&ifa->addr_lst);
2783                                 addrconf_del_timer(ifa);
2784                                 goto restart;
2785                         }
2786                 }
2787                 spin_unlock_bh(&addrconf_hash_lock);
2788         }
2789
2790         write_lock_bh(&idev->lock);
2791
2792         /* Step 2: clear flags for stateless addrconf */
2793         if (!how)
2794                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2795
2796 #ifdef CONFIG_IPV6_PRIVACY
2797         if (how && del_timer(&idev->regen_timer))
2798                 in6_dev_put(idev);
2799
2800         /* Step 3: clear tempaddr list */
2801         while (!list_empty(&idev->tempaddr_list)) {
2802                 ifa = list_first_entry(&idev->tempaddr_list,
2803                                        struct inet6_ifaddr, tmp_list);
2804                 list_del(&ifa->tmp_list);
2805                 write_unlock_bh(&idev->lock);
2806                 spin_lock_bh(&ifa->lock);
2807
2808                 if (ifa->ifpub) {
2809                         in6_ifa_put(ifa->ifpub);
2810                         ifa->ifpub = NULL;
2811                 }
2812                 spin_unlock_bh(&ifa->lock);
2813                 in6_ifa_put(ifa);
2814                 write_lock_bh(&idev->lock);
2815         }
2816 #endif
2817
2818         while (!list_empty(&idev->addr_list)) {
2819                 ifa = list_first_entry(&idev->addr_list,
2820                                        struct inet6_ifaddr, if_list);
2821                 addrconf_del_timer(ifa);
2822
2823                 list_del(&ifa->if_list);
2824
2825                 write_unlock_bh(&idev->lock);
2826
2827                 spin_lock_bh(&ifa->state_lock);
2828                 state = ifa->state;
2829                 ifa->state = INET6_IFADDR_STATE_DEAD;
2830                 spin_unlock_bh(&ifa->state_lock);
2831
2832                 if (state != INET6_IFADDR_STATE_DEAD) {
2833                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
2834                         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2835                 }
2836                 in6_ifa_put(ifa);
2837
2838                 write_lock_bh(&idev->lock);
2839         }
2840
2841         write_unlock_bh(&idev->lock);
2842
2843         /* Step 5: Discard multicast list */
2844         if (how)
2845                 ipv6_mc_destroy_dev(idev);
2846         else
2847                 ipv6_mc_down(idev);
2848
2849         idev->tstamp = jiffies;
2850
2851         /* Last: Shot the device (if unregistered) */
2852         if (how) {
2853                 addrconf_sysctl_unregister(idev);
2854                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2855                 neigh_ifdown(&nd_tbl, dev);
2856                 in6_dev_put(idev);
2857         }
2858         return 0;
2859 }
2860
2861 static void addrconf_rs_timer(unsigned long data)
2862 {
2863         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2864         struct inet6_dev *idev = ifp->idev;
2865
2866         read_lock(&idev->lock);
2867         if (idev->dead || !(idev->if_flags & IF_READY))
2868                 goto out;
2869
2870         if (idev->cnf.forwarding)
2871                 goto out;
2872
2873         /* Announcement received after solicitation was sent */
2874         if (idev->if_flags & IF_RA_RCVD)
2875                 goto out;
2876
2877         spin_lock(&ifp->lock);
2878         if (ifp->probes++ < idev->cnf.rtr_solicits) {
2879                 /* The wait after the last probe can be shorter */
2880                 addrconf_mod_timer(ifp, AC_RS,
2881                                    (ifp->probes == idev->cnf.rtr_solicits) ?
2882                                    idev->cnf.rtr_solicit_delay :
2883                                    idev->cnf.rtr_solicit_interval);
2884                 spin_unlock(&ifp->lock);
2885
2886                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2887         } else {
2888                 spin_unlock(&ifp->lock);
2889                 /*
2890                  * Note: we do not support deprecated "all on-link"
2891                  * assumption any longer.
2892                  */
2893                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2894                        idev->dev->name);
2895         }
2896
2897 out:
2898         read_unlock(&idev->lock);
2899         in6_ifa_put(ifp);
2900 }
2901
2902 /*
2903  *      Duplicate Address Detection
2904  */
2905 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2906 {
2907         unsigned long rand_num;
2908         struct inet6_dev *idev = ifp->idev;
2909
2910         if (ifp->flags & IFA_F_OPTIMISTIC)
2911                 rand_num = 0;
2912         else
2913                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2914
2915         ifp->probes = idev->cnf.dad_transmits;
2916         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2917 }
2918
2919 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2920 {
2921         struct inet6_dev *idev = ifp->idev;
2922         struct net_device *dev = idev->dev;
2923
2924         addrconf_join_solict(dev, &ifp->addr);
2925
2926         net_srandom(ifp->addr.s6_addr32[3]);
2927
2928         read_lock_bh(&idev->lock);
2929         spin_lock(&ifp->lock);
2930         if (ifp->state == INET6_IFADDR_STATE_DEAD)
2931                 goto out;
2932
2933         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2934             idev->cnf.accept_dad < 1 ||
2935             !(ifp->flags&IFA_F_TENTATIVE) ||
2936             ifp->flags & IFA_F_NODAD) {
2937                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2938                 spin_unlock(&ifp->lock);
2939                 read_unlock_bh(&idev->lock);
2940
2941                 addrconf_dad_completed(ifp);
2942                 return;
2943         }
2944
2945         if (!(idev->if_flags & IF_READY)) {
2946                 spin_unlock(&ifp->lock);
2947                 read_unlock_bh(&idev->lock);
2948                 /*
2949                  * If the device is not ready:
2950                  * - keep it tentative if it is a permanent address.
2951                  * - otherwise, kill it.
2952                  */
2953                 in6_ifa_hold(ifp);
2954                 addrconf_dad_stop(ifp, 0);
2955                 return;
2956         }
2957
2958         /*
2959          * Optimistic nodes can start receiving
2960          * Frames right away
2961          */
2962         if (ifp->flags & IFA_F_OPTIMISTIC)
2963                 ip6_ins_rt(ifp->rt);
2964
2965         addrconf_dad_kick(ifp);
2966 out:
2967         spin_unlock(&ifp->lock);
2968         read_unlock_bh(&idev->lock);
2969 }
2970
2971 static void addrconf_dad_timer(unsigned long data)
2972 {
2973         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2974         struct inet6_dev *idev = ifp->idev;
2975         struct in6_addr mcaddr;
2976
2977         if (!ifp->probes && addrconf_dad_end(ifp))
2978                 goto out;
2979
2980         read_lock(&idev->lock);
2981         if (idev->dead || !(idev->if_flags & IF_READY)) {
2982                 read_unlock(&idev->lock);
2983                 goto out;
2984         }
2985
2986         spin_lock(&ifp->lock);
2987         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2988                 spin_unlock(&ifp->lock);
2989                 read_unlock(&idev->lock);
2990                 goto out;
2991         }
2992
2993         if (ifp->probes == 0) {
2994                 /*
2995                  * DAD was successful
2996                  */
2997
2998                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2999                 spin_unlock(&ifp->lock);
3000                 read_unlock(&idev->lock);
3001
3002                 addrconf_dad_completed(ifp);
3003
3004                 goto out;
3005         }
3006
3007         ifp->probes--;
3008         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3009         spin_unlock(&ifp->lock);
3010         read_unlock(&idev->lock);
3011
3012         /* send a neighbour solicitation for our addr */
3013         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3014         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3015 out:
3016         in6_ifa_put(ifp);
3017 }
3018
3019 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3020 {
3021         struct net_device *dev = ifp->idev->dev;
3022
3023         /*
3024          *      Configure the address for reception. Now it is valid.
3025          */
3026
3027         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3028
3029         /* If added prefix is link local and we are prepared to process
3030            router advertisements, start sending router solicitations.
3031          */
3032
3033         if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3034              ifp->idev->cnf.accept_ra == 2) &&
3035             ifp->idev->cnf.rtr_solicits > 0 &&
3036             (dev->flags&IFF_LOOPBACK) == 0 &&
3037             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3038                 /*
3039                  *      If a host as already performed a random delay
3040                  *      [...] as part of DAD [...] there is no need
3041                  *      to delay again before sending the first RS
3042                  */
3043                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3044
3045                 spin_lock_bh(&ifp->lock);
3046                 ifp->probes = 1;
3047                 ifp->idev->if_flags |= IF_RS_SENT;
3048                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3049                 spin_unlock_bh(&ifp->lock);
3050         }
3051 }
3052
3053 static void addrconf_dad_run(struct inet6_dev *idev)
3054 {
3055         struct inet6_ifaddr *ifp;
3056
3057         read_lock_bh(&idev->lock);
3058         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3059                 spin_lock(&ifp->lock);
3060                 if (ifp->flags & IFA_F_TENTATIVE &&
3061                     ifp->state == INET6_IFADDR_STATE_DAD)
3062                         addrconf_dad_kick(ifp);
3063                 spin_unlock(&ifp->lock);
3064         }
3065         read_unlock_bh(&idev->lock);
3066 }
3067
3068 #ifdef CONFIG_PROC_FS
3069 struct if6_iter_state {
3070         struct seq_net_private p;
3071         int bucket;
3072         int offset;
3073 };
3074
3075 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3076 {
3077         struct inet6_ifaddr *ifa = NULL;
3078         struct if6_iter_state *state = seq->private;
3079         struct net *net = seq_file_net(seq);
3080         int p = 0;
3081
3082         /* initial bucket if pos is 0 */
3083         if (pos == 0) {
3084                 state->bucket = 0;
3085                 state->offset = 0;
3086         }
3087
3088         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3089                 struct hlist_node *n;
3090                 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3091                                          addr_lst) {
3092                         /* sync with offset */
3093                         if (p < state->offset) {
3094                                 p++;
3095                                 continue;
3096                         }
3097                         state->offset++;
3098                         if (net_eq(dev_net(ifa->idev->dev), net))
3099                                 return ifa;
3100                 }
3101
3102                 /* prepare for next bucket */
3103                 state->offset = 0;
3104                 p = 0;
3105         }
3106         return NULL;
3107 }
3108
3109 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3110                                          struct inet6_ifaddr *ifa)
3111 {
3112         struct if6_iter_state *state = seq->private;
3113         struct net *net = seq_file_net(seq);
3114         struct hlist_node *n = &ifa->addr_lst;
3115
3116         hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3117                 state->offset++;
3118                 if (net_eq(dev_net(ifa->idev->dev), net))
3119                         return ifa;
3120         }
3121
3122         while (++state->bucket < IN6_ADDR_HSIZE) {
3123                 state->offset = 0;
3124                 hlist_for_each_entry_rcu_bh(ifa, n,
3125                                      &inet6_addr_lst[state->bucket], addr_lst) {
3126                         state->offset++;
3127                         if (net_eq(dev_net(ifa->idev->dev), net))
3128                                 return ifa;
3129                 }
3130         }
3131
3132         return NULL;
3133 }
3134
3135 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3136         __acquires(rcu_bh)
3137 {
3138         rcu_read_lock_bh();
3139         return if6_get_first(seq, *pos);
3140 }
3141
3142 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3143 {
3144         struct inet6_ifaddr *ifa;
3145
3146         ifa = if6_get_next(seq, v);
3147         ++*pos;
3148         return ifa;
3149 }
3150
3151 static void if6_seq_stop(struct seq_file *seq, void *v)
3152         __releases(rcu_bh)
3153 {
3154         rcu_read_unlock_bh();
3155 }
3156
3157 static int if6_seq_show(struct seq_file *seq, void *v)
3158 {
3159         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3160         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3161                    &ifp->addr,
3162                    ifp->idev->dev->ifindex,
3163                    ifp->prefix_len,
3164                    ifp->scope,
3165                    ifp->flags,
3166                    ifp->idev->dev->name);
3167         return 0;
3168 }
3169
3170 static const struct seq_operations if6_seq_ops = {
3171         .start  = if6_seq_start,
3172         .next   = if6_seq_next,
3173         .show   = if6_seq_show,
3174         .stop   = if6_seq_stop,
3175 };
3176
3177 static int if6_seq_open(struct inode *inode, struct file *file)
3178 {
3179         return seq_open_net(inode, file, &if6_seq_ops,
3180                             sizeof(struct if6_iter_state));
3181 }
3182
3183 static const struct file_operations if6_fops = {
3184         .owner          = THIS_MODULE,
3185         .open           = if6_seq_open,
3186         .read           = seq_read,
3187         .llseek         = seq_lseek,
3188         .release        = seq_release_net,
3189 };
3190
3191 static int __net_init if6_proc_net_init(struct net *net)
3192 {
3193         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3194                 return -ENOMEM;
3195         return 0;
3196 }
3197
3198 static void __net_exit if6_proc_net_exit(struct net *net)
3199 {
3200        proc_net_remove(net, "if_inet6");
3201 }
3202
3203 static struct pernet_operations if6_proc_net_ops = {
3204        .init = if6_proc_net_init,
3205        .exit = if6_proc_net_exit,
3206 };
3207
3208 int __init if6_proc_init(void)
3209 {
3210         return register_pernet_subsys(&if6_proc_net_ops);
3211 }
3212
3213 void if6_proc_exit(void)
3214 {
3215         unregister_pernet_subsys(&if6_proc_net_ops);
3216 }
3217 #endif  /* CONFIG_PROC_FS */
3218
3219 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3220 /* Check if address is a home address configured on any interface. */
3221 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3222 {
3223         int ret = 0;
3224         struct inet6_ifaddr *ifp = NULL;
3225         struct hlist_node *n;
3226         unsigned int hash = ipv6_addr_hash(addr);
3227
3228         rcu_read_lock_bh();
3229         hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3230                 if (!net_eq(dev_net(ifp->idev->dev), net))
3231                         continue;
3232                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3233                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3234                         ret = 1;
3235                         break;
3236                 }
3237         }
3238         rcu_read_unlock_bh();
3239         return ret;
3240 }
3241 #endif
3242
3243 /*
3244  *      Periodic address status verification
3245  */
3246
3247 static void addrconf_verify(unsigned long foo)
3248 {
3249         unsigned long now, next, next_sec, next_sched;
3250         struct inet6_ifaddr *ifp;
3251         struct hlist_node *node;
3252         int i;
3253
3254         rcu_read_lock_bh();
3255         spin_lock(&addrconf_verify_lock);
3256         now = jiffies;
3257         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3258
3259         del_timer(&addr_chk_timer);
3260
3261         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3262 restart:
3263                 hlist_for_each_entry_rcu_bh(ifp, node,
3264                                          &inet6_addr_lst[i], addr_lst) {
3265                         unsigned long age;
3266
3267                         if (ifp->flags & IFA_F_PERMANENT)
3268                                 continue;
3269
3270                         spin_lock(&ifp->lock);
3271                         /* We try to batch several events at once. */
3272                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3273
3274                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3275                             age >= ifp->valid_lft) {
3276                                 spin_unlock(&ifp->lock);
3277                                 in6_ifa_hold(ifp);
3278                                 ipv6_del_addr(ifp);
3279                                 goto restart;
3280                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3281                                 spin_unlock(&ifp->lock);
3282                                 continue;
3283                         } else if (age >= ifp->prefered_lft) {
3284                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3285                                 int deprecate = 0;
3286
3287                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3288                                         deprecate = 1;
3289                                         ifp->flags |= IFA_F_DEPRECATED;
3290                                 }
3291
3292                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3293                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3294
3295                                 spin_unlock(&ifp->lock);
3296
3297                                 if (deprecate) {
3298                                         in6_ifa_hold(ifp);
3299
3300                                         ipv6_ifa_notify(0, ifp);
3301                                         in6_ifa_put(ifp);
3302                                         goto restart;
3303                                 }
3304 #ifdef CONFIG_IPV6_PRIVACY
3305                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3306                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3307                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3308                                         ifp->idev->cnf.dad_transmits *
3309                                         ifp->idev->nd_parms->retrans_time / HZ;
3310
3311                                 if (age >= ifp->prefered_lft - regen_advance) {
3312                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3313                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3314                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3315                                         if (!ifp->regen_count && ifpub) {
3316                                                 ifp->regen_count++;
3317                                                 in6_ifa_hold(ifp);
3318                                                 in6_ifa_hold(ifpub);
3319                                                 spin_unlock(&ifp->lock);
3320
3321                                                 spin_lock(&ifpub->lock);
3322                                                 ifpub->regen_count = 0;
3323                                                 spin_unlock(&ifpub->lock);
3324                                                 ipv6_create_tempaddr(ifpub, ifp);
3325                                                 in6_ifa_put(ifpub);
3326                                                 in6_ifa_put(ifp);
3327                                                 goto restart;
3328                                         }
3329                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3330                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3331                                 spin_unlock(&ifp->lock);
3332 #endif
3333                         } else {
3334                                 /* ifp->prefered_lft <= ifp->valid_lft */
3335                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3336                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3337                                 spin_unlock(&ifp->lock);
3338                         }
3339                 }
3340         }
3341
3342         next_sec = round_jiffies_up(next);
3343         next_sched = next;
3344
3345         /* If rounded timeout is accurate enough, accept it. */
3346         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3347                 next_sched = next_sec;
3348
3349         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3350         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3351                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3352
3353         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3354               now, next, next_sec, next_sched));
3355
3356         addr_chk_timer.expires = next_sched;
3357         add_timer(&addr_chk_timer);
3358         spin_unlock(&addrconf_verify_lock);
3359         rcu_read_unlock_bh();
3360 }
3361
3362 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3363 {
3364         struct in6_addr *pfx = NULL;
3365
3366         if (addr)
3367                 pfx = nla_data(addr);
3368
3369         if (local) {
3370                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3371                         pfx = NULL;
3372                 else
3373                         pfx = nla_data(local);
3374         }
3375
3376         return pfx;
3377 }
3378
3379 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3380         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3381         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3382         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3383 };
3384
3385 static int
3386 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3387 {
3388         struct net *net = sock_net(skb->sk);
3389         struct ifaddrmsg *ifm;
3390         struct nlattr *tb[IFA_MAX+1];
3391         struct in6_addr *pfx;
3392         int err;
3393
3394         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3395         if (err < 0)
3396                 return err;
3397
3398         ifm = nlmsg_data(nlh);
3399         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3400         if (pfx == NULL)
3401                 return -EINVAL;
3402
3403         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3404 }
3405
3406 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3407                              u32 prefered_lft, u32 valid_lft)
3408 {
3409         u32 flags;
3410         clock_t expires;
3411         unsigned long timeout;
3412
3413         if (!valid_lft || (prefered_lft > valid_lft))
3414                 return -EINVAL;
3415
3416         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3417         if (addrconf_finite_timeout(timeout)) {
3418                 expires = jiffies_to_clock_t(timeout * HZ);
3419                 valid_lft = timeout;
3420                 flags = RTF_EXPIRES;
3421         } else {
3422                 expires = 0;
3423                 flags = 0;
3424                 ifa_flags |= IFA_F_PERMANENT;
3425         }
3426
3427         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3428         if (addrconf_finite_timeout(timeout)) {
3429                 if (timeout == 0)
3430                         ifa_flags |= IFA_F_DEPRECATED;
3431                 prefered_lft = timeout;
3432         }
3433
3434         spin_lock_bh(&ifp->lock);
3435         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3436         ifp->tstamp = jiffies;
3437         ifp->valid_lft = valid_lft;
3438         ifp->prefered_lft = prefered_lft;
3439
3440         spin_unlock_bh(&ifp->lock);
3441         if (!(ifp->flags&IFA_F_TENTATIVE))
3442                 ipv6_ifa_notify(0, ifp);
3443
3444         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3445                               expires, flags);
3446         addrconf_verify(0);
3447
3448         return 0;
3449 }
3450
3451 static int
3452 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3453 {
3454         struct net *net = sock_net(skb->sk);
3455         struct ifaddrmsg *ifm;
3456         struct nlattr *tb[IFA_MAX+1];
3457         struct in6_addr *pfx;
3458         struct inet6_ifaddr *ifa;
3459         struct net_device *dev;
3460         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3461         u8 ifa_flags;
3462         int err;
3463
3464         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3465         if (err < 0)
3466                 return err;
3467
3468         ifm = nlmsg_data(nlh);
3469         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3470         if (pfx == NULL)
3471                 return -EINVAL;
3472
3473         if (tb[IFA_CACHEINFO]) {
3474                 struct ifa_cacheinfo *ci;
3475
3476                 ci = nla_data(tb[IFA_CACHEINFO]);
3477                 valid_lft = ci->ifa_valid;
3478                 preferred_lft = ci->ifa_prefered;
3479         } else {
3480                 preferred_lft = INFINITY_LIFE_TIME;
3481                 valid_lft = INFINITY_LIFE_TIME;
3482         }
3483
3484         dev =  __dev_get_by_index(net, ifm->ifa_index);
3485         if (dev == NULL)
3486                 return -ENODEV;
3487
3488         /* We ignore other flags so far. */
3489         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3490
3491         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3492         if (ifa == NULL) {
3493                 /*
3494                  * It would be best to check for !NLM_F_CREATE here but
3495                  * userspace alreay relies on not having to provide this.
3496                  */
3497                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3498                                       ifm->ifa_prefixlen, ifa_flags,
3499                                       preferred_lft, valid_lft);
3500         }
3501
3502         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3503             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3504                 err = -EEXIST;
3505         else
3506                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3507
3508         in6_ifa_put(ifa);
3509
3510         return err;
3511 }
3512
3513 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3514                           u8 scope, int ifindex)
3515 {
3516         struct ifaddrmsg *ifm;
3517
3518         ifm = nlmsg_data(nlh);
3519         ifm->ifa_family = AF_INET6;
3520         ifm->ifa_prefixlen = prefixlen;
3521         ifm->ifa_flags = flags;
3522         ifm->ifa_scope = scope;
3523         ifm->ifa_index = ifindex;
3524 }
3525
3526 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3527                          unsigned long tstamp, u32 preferred, u32 valid)
3528 {
3529         struct ifa_cacheinfo ci;
3530
3531         ci.cstamp = cstamp_delta(cstamp);
3532         ci.tstamp = cstamp_delta(tstamp);
3533         ci.ifa_prefered = preferred;
3534         ci.ifa_valid = valid;
3535
3536         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3537 }
3538
3539 static inline int rt_scope(int ifa_scope)
3540 {
3541         if (ifa_scope & IFA_HOST)
3542                 return RT_SCOPE_HOST;
3543         else if (ifa_scope & IFA_LINK)
3544                 return RT_SCOPE_LINK;
3545         else if (ifa_scope & IFA_SITE)
3546                 return RT_SCOPE_SITE;
3547         else
3548                 return RT_SCOPE_UNIVERSE;
3549 }
3550
3551 static inline int inet6_ifaddr_msgsize(void)
3552 {
3553         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3554                + nla_total_size(16) /* IFA_ADDRESS */
3555                + nla_total_size(sizeof(struct ifa_cacheinfo));
3556 }
3557
3558 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3559                              u32 pid, u32 seq, int event, unsigned int flags)
3560 {
3561         struct nlmsghdr  *nlh;
3562         u32 preferred, valid;
3563
3564         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3565         if (nlh == NULL)
3566                 return -EMSGSIZE;
3567
3568         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3569                       ifa->idev->dev->ifindex);
3570
3571         if (!(ifa->flags&IFA_F_PERMANENT)) {
3572                 preferred = ifa->prefered_lft;
3573                 valid = ifa->valid_lft;
3574                 if (preferred != INFINITY_LIFE_TIME) {
3575                         long tval = (jiffies - ifa->tstamp)/HZ;
3576                         if (preferred > tval)
3577                                 preferred -= tval;
3578                         else
3579                                 preferred = 0;
3580                         if (valid != INFINITY_LIFE_TIME) {
3581                                 if (valid > tval)
3582                                         valid -= tval;
3583                                 else
3584                                         valid = 0;
3585                         }
3586                 }
3587         } else {
3588                 preferred = INFINITY_LIFE_TIME;
3589                 valid = INFINITY_LIFE_TIME;
3590         }
3591
3592         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3593             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3594                 nlmsg_cancel(skb, nlh);
3595                 return -EMSGSIZE;
3596         }
3597
3598         return nlmsg_end(skb, nlh);
3599 }
3600
3601 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3602                                 u32 pid, u32 seq, int event, u16 flags)
3603 {
3604         struct nlmsghdr  *nlh;
3605         u8 scope = RT_SCOPE_UNIVERSE;
3606         int ifindex = ifmca->idev->dev->ifindex;
3607
3608         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3609                 scope = RT_SCOPE_SITE;
3610
3611         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3612         if (nlh == NULL)
3613                 return -EMSGSIZE;
3614
3615         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3616         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3617             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3618                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3619                 nlmsg_cancel(skb, nlh);
3620                 return -EMSGSIZE;
3621         }
3622
3623         return nlmsg_end(skb, nlh);
3624 }
3625
3626 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3627                                 u32 pid, u32 seq, int event, unsigned int flags)
3628 {
3629         struct nlmsghdr  *nlh;
3630         u8 scope = RT_SCOPE_UNIVERSE;
3631         int ifindex = ifaca->aca_idev->dev->ifindex;
3632
3633         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3634                 scope = RT_SCOPE_SITE;
3635
3636         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3637         if (nlh == NULL)
3638                 return -EMSGSIZE;
3639
3640         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3641         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3642             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3643                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3644                 nlmsg_cancel(skb, nlh);
3645                 return -EMSGSIZE;
3646         }
3647
3648         return nlmsg_end(skb, nlh);
3649 }
3650
3651 enum addr_type_t {
3652         UNICAST_ADDR,
3653         MULTICAST_ADDR,
3654         ANYCAST_ADDR,
3655 };
3656
3657 /* called with rcu_read_lock() */
3658 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3659                           struct netlink_callback *cb, enum addr_type_t type,
3660                           int s_ip_idx, int *p_ip_idx)
3661 {
3662         struct ifmcaddr6 *ifmca;
3663         struct ifacaddr6 *ifaca;
3664         int err = 1;
3665         int ip_idx = *p_ip_idx;
3666
3667         read_lock_bh(&idev->lock);
3668         switch (type) {
3669         case UNICAST_ADDR: {
3670                 struct inet6_ifaddr *ifa;
3671
3672                 /* unicast address incl. temp addr */
3673                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3674                         if (++ip_idx < s_ip_idx)
3675                                 continue;
3676                         err = inet6_fill_ifaddr(skb, ifa,
3677                                                 NETLINK_CB(cb->skb).pid,
3678                                                 cb->nlh->nlmsg_seq,
3679                                                 RTM_NEWADDR,
3680                                                 NLM_F_MULTI);
3681                         if (err <= 0)
3682                                 break;
3683                 }
3684                 break;
3685         }
3686         case MULTICAST_ADDR:
3687                 /* multicast address */
3688                 for (ifmca = idev->mc_list; ifmca;
3689                      ifmca = ifmca->next, ip_idx++) {
3690                         if (ip_idx < s_ip_idx)
3691                                 continue;
3692                         err = inet6_fill_ifmcaddr(skb, ifmca,
3693                                                   NETLINK_CB(cb->skb).pid,
3694                                                   cb->nlh->nlmsg_seq,
3695                                                   RTM_GETMULTICAST,
3696                                                   NLM_F_MULTI);
3697                         if (err <= 0)
3698                                 break;
3699                 }
3700                 break;
3701         case ANYCAST_ADDR:
3702                 /* anycast address */
3703                 for (ifaca = idev->ac_list; ifaca;
3704                      ifaca = ifaca->aca_next, ip_idx++) {
3705                         if (ip_idx < s_ip_idx)
3706                                 continue;
3707                         err = inet6_fill_ifacaddr(skb, ifaca,
3708                                                   NETLINK_CB(cb->skb).pid,
3709                                                   cb->nlh->nlmsg_seq,
3710                                                   RTM_GETANYCAST,
3711                                                   NLM_F_MULTI);
3712                         if (err <= 0)
3713                                 break;
3714                 }
3715                 break;
3716         default:
3717                 break;
3718         }
3719         read_unlock_bh(&idev->lock);
3720         *p_ip_idx = ip_idx;
3721         return err;
3722 }
3723
3724 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3725                            enum addr_type_t type)
3726 {
3727         struct net *net = sock_net(skb->sk);
3728         int h, s_h;
3729         int idx, ip_idx;
3730         int s_idx, s_ip_idx;
3731         struct net_device *dev;
3732         struct inet6_dev *idev;
3733         struct hlist_head *head;
3734         struct hlist_node *node;
3735
3736         s_h = cb->args[0];
3737         s_idx = idx = cb->args[1];
3738         s_ip_idx = ip_idx = cb->args[2];
3739
3740         rcu_read_lock();
3741         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3742                 idx = 0;
3743                 head = &net->dev_index_head[h];
3744                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3745                         if (idx < s_idx)
3746                                 goto cont;
3747                         if (h > s_h || idx > s_idx)
3748                                 s_ip_idx = 0;
3749                         ip_idx = 0;
3750                         idev = __in6_dev_get(dev);
3751                         if (!idev)
3752                                 goto cont;
3753
3754                         if (in6_dump_addrs(idev, skb, cb, type,
3755                                            s_ip_idx, &ip_idx) <= 0)
3756                                 goto done;
3757 cont:
3758                         idx++;
3759                 }
3760         }
3761 done:
3762         rcu_read_unlock();
3763         cb->args[0] = h;
3764         cb->args[1] = idx;
3765         cb->args[2] = ip_idx;
3766
3767         return skb->len;
3768 }
3769
3770 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3771 {
3772         enum addr_type_t type = UNICAST_ADDR;
3773
3774         return inet6_dump_addr(skb, cb, type);
3775 }
3776
3777 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3778 {
3779         enum addr_type_t type = MULTICAST_ADDR;
3780
3781         return inet6_dump_addr(skb, cb, type);
3782 }
3783
3784
3785 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3786 {
3787         enum addr_type_t type = ANYCAST_ADDR;
3788
3789         return inet6_dump_addr(skb, cb, type);
3790 }
3791
3792 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3793                              void *arg)
3794 {
3795         struct net *net = sock_net(in_skb->sk);
3796         struct ifaddrmsg *ifm;
3797         struct nlattr *tb[IFA_MAX+1];
3798         struct in6_addr *addr = NULL;
3799         struct net_device *dev = NULL;
3800         struct inet6_ifaddr *ifa;
3801         struct sk_buff *skb;
3802         int err;
3803
3804         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3805         if (err < 0)
3806                 goto errout;
3807
3808         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3809         if (addr == NULL) {
3810                 err = -EINVAL;
3811                 goto errout;
3812         }
3813
3814         ifm = nlmsg_data(nlh);
3815         if (ifm->ifa_index)
3816                 dev = __dev_get_by_index(net, ifm->ifa_index);
3817
3818         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3819         if (!ifa) {
3820                 err = -EADDRNOTAVAIL;
3821                 goto errout;
3822         }
3823
3824         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3825         if (!skb) {
3826                 err = -ENOBUFS;
3827                 goto errout_ifa;
3828         }
3829
3830         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3831                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3832         if (err < 0) {
3833                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3834                 WARN_ON(err == -EMSGSIZE);
3835                 kfree_skb(skb);
3836                 goto errout_ifa;
3837         }
3838         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3839 errout_ifa:
3840         in6_ifa_put(ifa);
3841 errout:
3842         return err;
3843 }
3844
3845 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3846 {
3847         struct sk_buff *skb;
3848         struct net *net = dev_net(ifa->idev->dev);
3849         int err = -ENOBUFS;
3850
3851         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3852         if (skb == NULL)
3853                 goto errout;
3854
3855         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3856         if (err < 0) {
3857                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3858                 WARN_ON(err == -EMSGSIZE);
3859                 kfree_skb(skb);
3860                 goto errout;
3861         }
3862         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3863         return;
3864 errout:
3865         if (err < 0)
3866                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3867 }
3868
3869 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3870                                 __s32 *array, int bytes)
3871 {
3872         BUG_ON(bytes < (DEVCONF_MAX * 4));
3873
3874         memset(array, 0, bytes);
3875         array[DEVCONF_FORWARDING] = cnf->forwarding;
3876         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3877         array[DEVCONF_MTU6] = cnf->mtu6;
3878         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3879         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3880         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3881         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3882         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3883         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3884                 jiffies_to_msecs(cnf->rtr_solicit_interval);
3885         array[DEVCONF_RTR_SOLICIT_DELAY] =
3886                 jiffies_to_msecs(cnf->rtr_solicit_delay);
3887         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3888 #ifdef CONFIG_IPV6_PRIVACY
3889         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3890         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3891         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3892         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3893         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3894 #endif
3895         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3896         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3897         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3898 #ifdef CONFIG_IPV6_ROUTER_PREF
3899         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3900         array[DEVCONF_RTR_PROBE_INTERVAL] =
3901                 jiffies_to_msecs(cnf->rtr_probe_interval);
3902 #ifdef CONFIG_IPV6_ROUTE_INFO
3903         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3904 #endif
3905 #endif
3906         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3907         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3908 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3909         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3910 #endif
3911 #ifdef CONFIG_IPV6_MROUTE
3912         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3913 #endif
3914         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3915         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3916         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3917 }
3918
3919 static inline size_t inet6_ifla6_size(void)
3920 {
3921         return nla_total_size(4) /* IFLA_INET6_FLAGS */
3922              + nla_total_size(sizeof(struct ifla_cacheinfo))
3923              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3924              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3925              + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3926 }
3927
3928 static inline size_t inet6_if_nlmsg_size(void)
3929 {
3930         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3931                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3932                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3933                + nla_total_size(4) /* IFLA_MTU */
3934                + nla_total_size(4) /* IFLA_LINK */
3935                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3936 }
3937
3938 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3939                                       int items, int bytes)
3940 {
3941         int i;
3942         int pad = bytes - sizeof(u64) * items;
3943         BUG_ON(pad < 0);
3944
3945         /* Use put_unaligned() because stats may not be aligned for u64. */
3946         put_unaligned(items, &stats[0]);
3947         for (i = 1; i < items; i++)
3948                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3949
3950         memset(&stats[items], 0, pad);
3951 }
3952
3953 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3954                                       int items, int bytes, size_t syncpoff)
3955 {
3956         int i;
3957         int pad = bytes - sizeof(u64) * items;
3958         BUG_ON(pad < 0);
3959
3960         /* Use put_unaligned() because stats may not be aligned for u64. */
3961         put_unaligned(items, &stats[0]);
3962         for (i = 1; i < items; i++)
3963                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3964
3965         memset(&stats[items], 0, pad);
3966 }
3967
3968 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3969                              int bytes)
3970 {
3971         switch (attrtype) {
3972         case IFLA_INET6_STATS:
3973                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3974                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3975                 break;
3976         case IFLA_INET6_ICMP6STATS:
3977                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3978                 break;
3979         }
3980 }
3981
3982 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3983 {
3984         struct nlattr *nla;
3985         struct ifla_cacheinfo ci;
3986
3987         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3988
3989         ci.max_reasm_len = IPV6_MAXPLEN;
3990         ci.tstamp = cstamp_delta(idev->tstamp);
3991         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3992         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3993         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3994
3995         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3996         if (nla == NULL)
3997                 goto nla_put_failure;
3998         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3999
4000         /* XXX - MC not implemented */
4001
4002         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4003         if (nla == NULL)
4004                 goto nla_put_failure;
4005         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4006
4007         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4008         if (nla == NULL)
4009                 goto nla_put_failure;
4010         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4011
4012         return 0;
4013
4014 nla_put_failure:
4015         return -EMSGSIZE;
4016 }
4017
4018 static size_t inet6_get_link_af_size(const struct net_device *dev)
4019 {
4020         if (!__in6_dev_get(dev))
4021                 return 0;
4022
4023         return inet6_ifla6_size();
4024 }
4025
4026 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4027 {
4028         struct inet6_dev *idev = __in6_dev_get(dev);
4029
4030         if (!idev)
4031                 return -ENODATA;
4032
4033         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4034                 return -EMSGSIZE;
4035
4036         return 0;
4037 }
4038
4039 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4040                              u32 pid, u32 seq, int event, unsigned int flags)
4041 {
4042         struct net_device *dev = idev->dev;
4043         struct ifinfomsg *hdr;
4044         struct nlmsghdr *nlh;
4045         void *protoinfo;
4046
4047         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4048         if (nlh == NULL)
4049                 return -EMSGSIZE;
4050
4051         hdr = nlmsg_data(nlh);
4052         hdr->ifi_family = AF_INET6;
4053         hdr->__ifi_pad = 0;
4054         hdr->ifi_type = dev->type;
4055         hdr->ifi_index = dev->ifindex;
4056         hdr->ifi_flags = dev_get_flags(dev);
4057         hdr->ifi_change = 0;
4058
4059         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4060
4061         if (dev->addr_len)
4062                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4063
4064         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4065         if (dev->ifindex != dev->iflink)
4066                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4067
4068         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4069         if (protoinfo == NULL)
4070                 goto nla_put_failure;
4071
4072         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4073                 goto nla_put_failure;
4074
4075         nla_nest_end(skb, protoinfo);
4076         return nlmsg_end(skb, nlh);
4077
4078 nla_put_failure:
4079         nlmsg_cancel(skb, nlh);
4080         return -EMSGSIZE;
4081 }
4082
4083 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4084 {
4085         struct net *net = sock_net(skb->sk);
4086         int h, s_h;
4087         int idx = 0, s_idx;
4088         struct net_device *dev;
4089         struct inet6_dev *idev;
4090         struct hlist_head *head;
4091         struct hlist_node *node;
4092
4093         s_h = cb->args[0];
4094         s_idx = cb->args[1];
4095
4096         rcu_read_lock();
4097         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4098                 idx = 0;
4099                 head = &net->dev_index_head[h];
4100                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4101                         if (idx < s_idx)
4102                                 goto cont;
4103                         idev = __in6_dev_get(dev);
4104                         if (!idev)
4105                                 goto cont;
4106                         if (inet6_fill_ifinfo(skb, idev,
4107                                               NETLINK_CB(cb->skb).pid,
4108                                               cb->nlh->nlmsg_seq,
4109                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4110                                 goto out;
4111 cont:
4112                         idx++;
4113                 }
4114         }
4115 out:
4116         rcu_read_unlock();
4117         cb->args[1] = idx;
4118         cb->args[0] = h;
4119
4120         return skb->len;
4121 }
4122
4123 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4124 {
4125         struct sk_buff *skb;
4126         struct net *net = dev_net(idev->dev);
4127         int err = -ENOBUFS;
4128
4129         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4130         if (skb == NULL)
4131                 goto errout;
4132
4133         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4134         if (err < 0) {
4135                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4136                 WARN_ON(err == -EMSGSIZE);
4137                 kfree_skb(skb);
4138                 goto errout;
4139         }
4140         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4141         return;
4142 errout:
4143         if (err < 0)
4144                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4145 }
4146
4147 static inline size_t inet6_prefix_nlmsg_size(void)
4148 {
4149         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4150                + nla_total_size(sizeof(struct in6_addr))
4151                + nla_total_size(sizeof(struct prefix_cacheinfo));
4152 }
4153
4154 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4155                              struct prefix_info *pinfo, u32 pid, u32 seq,
4156                              int event, unsigned int flags)
4157 {
4158         struct prefixmsg *pmsg;
4159         struct nlmsghdr *nlh;
4160         struct prefix_cacheinfo ci;
4161
4162         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4163         if (nlh == NULL)
4164                 return -EMSGSIZE;
4165
4166         pmsg = nlmsg_data(nlh);
4167         pmsg->prefix_family = AF_INET6;
4168         pmsg->prefix_pad1 = 0;
4169         pmsg->prefix_pad2 = 0;
4170         pmsg->prefix_ifindex = idev->dev->ifindex;
4171         pmsg->prefix_len = pinfo->prefix_len;
4172         pmsg->prefix_type = pinfo->type;
4173         pmsg->prefix_pad3 = 0;
4174         pmsg->prefix_flags = 0;
4175         if (pinfo->onlink)
4176                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4177         if (pinfo->autoconf)
4178                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4179
4180         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4181
4182         ci.preferred_time = ntohl(pinfo->prefered);
4183         ci.valid_time = ntohl(pinfo->valid);
4184         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4185
4186         return nlmsg_end(skb, nlh);
4187
4188 nla_put_failure:
4189         nlmsg_cancel(skb, nlh);
4190         return -EMSGSIZE;
4191 }
4192
4193 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4194                          struct prefix_info *pinfo)
4195 {
4196         struct sk_buff *skb;
4197         struct net *net = dev_net(idev->dev);
4198         int err = -ENOBUFS;
4199
4200         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4201         if (skb == NULL)
4202                 goto errout;
4203
4204         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4205         if (err < 0) {
4206                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4207                 WARN_ON(err == -EMSGSIZE);
4208                 kfree_skb(skb);
4209                 goto errout;
4210         }
4211         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4212         return;
4213 errout:
4214         if (err < 0)
4215                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4216 }
4217
4218 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4219 {
4220         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4221
4222         switch (event) {
4223         case RTM_NEWADDR:
4224                 /*
4225                  * If the address was optimistic
4226                  * we inserted the route at the start of
4227                  * our DAD process, so we don't need
4228                  * to do it again
4229                  */
4230                 if (!(ifp->rt->rt6i_node))
4231                         ip6_ins_rt(ifp->rt);
4232                 if (ifp->idev->cnf.forwarding)
4233                         addrconf_join_anycast(ifp);
4234                 break;
4235         case RTM_DELADDR:
4236                 if (ifp->idev->cnf.forwarding)
4237                         addrconf_leave_anycast(ifp);
4238                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4239                 dst_hold(&ifp->rt->dst);
4240
4241                 if (ip6_del_rt(ifp->rt))
4242                         dst_free(&ifp->rt->dst);
4243                 break;
4244         }
4245 }
4246
4247 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4248 {
4249         rcu_read_lock_bh();
4250         if (likely(ifp->idev->dead == 0))
4251                 __ipv6_ifa_notify(event, ifp);
4252         rcu_read_unlock_bh();
4253 }
4254
4255 #ifdef CONFIG_SYSCTL
4256
4257 static
4258 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4259                            void __user *buffer, size_t *lenp, loff_t *ppos)
4260 {
4261         int *valp = ctl->data;
4262         int val = *valp;
4263         loff_t pos = *ppos;
4264         ctl_table lctl;
4265         int ret;
4266
4267         /*
4268          * ctl->data points to idev->cnf.forwarding, we should
4269          * not modify it until we get the rtnl lock.
4270          */
4271         lctl = *ctl;
4272         lctl.data = &val;
4273
4274         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4275
4276         if (write)
4277                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4278         if (ret)
4279                 *ppos = pos;
4280         return ret;
4281 }
4282
4283 static void dev_disable_change(struct inet6_dev *idev)
4284 {
4285         if (!idev || !idev->dev)
4286                 return;
4287
4288         if (idev->cnf.disable_ipv6)
4289                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4290         else
4291                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4292 }
4293
4294 static void addrconf_disable_change(struct net *net, __s32 newf)
4295 {
4296         struct net_device *dev;
4297         struct inet6_dev *idev;
4298
4299         rcu_read_lock();
4300         for_each_netdev_rcu(net, dev) {
4301                 idev = __in6_dev_get(dev);
4302                 if (idev) {
4303                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4304                         idev->cnf.disable_ipv6 = newf;
4305                         if (changed)
4306                                 dev_disable_change(idev);
4307                 }
4308         }
4309         rcu_read_unlock();
4310 }
4311
4312 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4313 {
4314         struct net *net;
4315         int old;
4316
4317         if (!rtnl_trylock())
4318                 return restart_syscall();
4319
4320         net = (struct net *)table->extra2;
4321         old = *p;
4322         *p = newf;
4323
4324         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4325                 rtnl_unlock();
4326                 return 0;
4327         }
4328
4329         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4330                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4331                 addrconf_disable_change(net, newf);
4332         } else if ((!newf) ^ (!old))
4333                 dev_disable_change((struct inet6_dev *)table->extra1);
4334
4335         rtnl_unlock();
4336         return 0;
4337 }
4338
4339 static
4340 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4341                             void __user *buffer, size_t *lenp, loff_t *ppos)
4342 {
4343         int *valp = ctl->data;
4344         int val = *valp;
4345         loff_t pos = *ppos;
4346         ctl_table lctl;
4347         int ret;
4348
4349         /*
4350          * ctl->data points to idev->cnf.disable_ipv6, we should
4351          * not modify it until we get the rtnl lock.
4352          */
4353         lctl = *ctl;
4354         lctl.data = &val;
4355
4356         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4357
4358         if (write)
4359                 ret = addrconf_disable_ipv6(ctl, valp, val);
4360         if (ret)
4361                 *ppos = pos;
4362         return ret;
4363 }
4364
4365 static struct addrconf_sysctl_table
4366 {
4367         struct ctl_table_header *sysctl_header;
4368         ctl_table addrconf_vars[DEVCONF_MAX+1];
4369         char *dev_name;
4370 } addrconf_sysctl __read_mostly = {
4371         .sysctl_header = NULL,
4372         .addrconf_vars = {
4373                 {
4374                         .procname       = "forwarding",
4375                         .data           = &ipv6_devconf.forwarding,
4376                         .maxlen         = sizeof(int),
4377                         .mode           = 0644,
4378                         .proc_handler   = addrconf_sysctl_forward,
4379                 },
4380                 {
4381                         .procname       = "hop_limit",
4382                         .data           = &ipv6_devconf.hop_limit,
4383                         .maxlen         = sizeof(int),
4384                         .mode           = 0644,
4385                         .proc_handler   = proc_dointvec,
4386                 },
4387                 {
4388                         .procname       = "mtu",
4389                         .data           = &ipv6_devconf.mtu6,
4390                         .maxlen         = sizeof(int),
4391                         .mode           = 0644,
4392                         .proc_handler   = proc_dointvec,
4393                 },
4394                 {
4395                         .procname       = "accept_ra",
4396                         .data           = &ipv6_devconf.accept_ra,
4397                         .maxlen         = sizeof(int),
4398                         .mode           = 0644,
4399                         .proc_handler   = proc_dointvec,
4400                 },
4401                 {
4402                         .procname       = "accept_redirects",
4403                         .data           = &ipv6_devconf.accept_redirects,
4404                         .maxlen         = sizeof(int),
4405                         .mode           = 0644,
4406                         .proc_handler   = proc_dointvec,
4407                 },
4408                 {
4409                         .procname       = "autoconf",
4410                         .data           = &ipv6_devconf.autoconf,
4411                         .maxlen         = sizeof(int),
4412                         .mode           = 0644,
4413                         .proc_handler   = proc_dointvec,
4414                 },
4415                 {
4416                         .procname       = "dad_transmits",
4417                         .data           = &ipv6_devconf.dad_transmits,
4418                         .maxlen         = sizeof(int),
4419                         .mode           = 0644,
4420                         .proc_handler   = proc_dointvec,
4421                 },
4422                 {
4423                         .procname       = "router_solicitations",
4424                         .data           = &ipv6_devconf.rtr_solicits,
4425                         .maxlen         = sizeof(int),
4426                         .mode           = 0644,
4427                         .proc_handler   = proc_dointvec,
4428                 },
4429                 {
4430                         .procname       = "router_solicitation_interval",
4431                         .data           = &ipv6_devconf.rtr_solicit_interval,
4432                         .maxlen         = sizeof(int),
4433                         .mode           = 0644,
4434                         .proc_handler   = proc_dointvec_jiffies,
4435                 },
4436                 {
4437                         .procname       = "router_solicitation_delay",
4438                         .data           = &ipv6_devconf.rtr_solicit_delay,
4439                         .maxlen         = sizeof(int),
4440                         .mode           = 0644,
4441                         .proc_handler   = proc_dointvec_jiffies,
4442                 },
4443                 {
4444                         .procname       = "force_mld_version",
4445                         .data           = &ipv6_devconf.force_mld_version,
4446                         .maxlen         = sizeof(int),
4447                         .mode           = 0644,
4448                         .proc_handler   = proc_dointvec,
4449                 },
4450 #ifdef CONFIG_IPV6_PRIVACY
4451                 {
4452                         .procname       = "use_tempaddr",
4453                         .data           = &ipv6_devconf.use_tempaddr,
4454                         .maxlen         = sizeof(int),
4455                         .mode           = 0644,
4456                         .proc_handler   = proc_dointvec,
4457                 },
4458                 {
4459                         .procname       = "temp_valid_lft",
4460                         .data           = &ipv6_devconf.temp_valid_lft,
4461                         .maxlen         = sizeof(int),
4462                         .mode           = 0644,
4463                         .proc_handler   = proc_dointvec,
4464                 },
4465                 {
4466                         .procname       = "temp_prefered_lft",
4467                         .data           = &ipv6_devconf.temp_prefered_lft,
4468                         .maxlen         = sizeof(int),
4469                         .mode           = 0644,
4470                         .proc_handler   = proc_dointvec,
4471                 },
4472                 {
4473                         .procname       = "regen_max_retry",
4474                         .data           = &ipv6_devconf.regen_max_retry,
4475                         .maxlen         = sizeof(int),
4476                         .mode           = 0644,
4477                         .proc_handler   = proc_dointvec,
4478                 },
4479                 {
4480                         .procname       = "max_desync_factor",
4481                         .data           = &ipv6_devconf.max_desync_factor,
4482                         .maxlen         = sizeof(int),
4483                         .mode           = 0644,
4484                         .proc_handler   = proc_dointvec,
4485                 },
4486 #endif
4487                 {
4488                         .procname       = "max_addresses",
4489                         .data           = &ipv6_devconf.max_addresses,
4490                         .maxlen         = sizeof(int),
4491                         .mode           = 0644,
4492                         .proc_handler   = proc_dointvec,
4493                 },
4494                 {
4495                         .procname       = "accept_ra_defrtr",
4496                         .data           = &ipv6_devconf.accept_ra_defrtr,
4497                         .maxlen         = sizeof(int),
4498                         .mode           = 0644,
4499                         .proc_handler   = proc_dointvec,
4500                 },
4501                 {
4502                         .procname       = "accept_ra_pinfo",
4503                         .data           = &ipv6_devconf.accept_ra_pinfo,
4504                         .maxlen         = sizeof(int),
4505                         .mode           = 0644,
4506                         .proc_handler   = proc_dointvec,
4507                 },
4508 #ifdef CONFIG_IPV6_ROUTER_PREF
4509                 {
4510                         .procname       = "accept_ra_rtr_pref",
4511                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4512                         .maxlen         = sizeof(int),
4513                         .mode           = 0644,
4514                         .proc_handler   = proc_dointvec,
4515                 },
4516                 {
4517                         .procname       = "router_probe_interval",
4518                         .data           = &ipv6_devconf.rtr_probe_interval,
4519                         .maxlen         = sizeof(int),
4520                         .mode           = 0644,
4521                         .proc_handler   = proc_dointvec_jiffies,
4522                 },
4523 #ifdef CONFIG_IPV6_ROUTE_INFO
4524                 {
4525                         .procname       = "accept_ra_rt_info_max_plen",
4526                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4527                         .maxlen         = sizeof(int),
4528                         .mode           = 0644,
4529                         .proc_handler   = proc_dointvec,
4530                 },
4531 #endif
4532 #endif
4533                 {
4534                         .procname       = "proxy_ndp",
4535                         .data           = &ipv6_devconf.proxy_ndp,
4536                         .maxlen         = sizeof(int),
4537                         .mode           = 0644,
4538                         .proc_handler   = proc_dointvec,
4539                 },
4540                 {
4541                         .procname       = "accept_source_route",
4542                         .data           = &ipv6_devconf.accept_source_route,
4543                         .maxlen         = sizeof(int),
4544                         .mode           = 0644,
4545                         .proc_handler   = proc_dointvec,
4546                 },
4547 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4548                 {
4549                         .procname       = "optimistic_dad",
4550                         .data           = &ipv6_devconf.optimistic_dad,
4551                         .maxlen         = sizeof(int),
4552                         .mode           = 0644,
4553                         .proc_handler   = proc_dointvec,
4554
4555                 },
4556 #endif
4557 #ifdef CONFIG_IPV6_MROUTE
4558                 {
4559                         .procname       = "mc_forwarding",
4560                         .data           = &ipv6_devconf.mc_forwarding,
4561                         .maxlen         = sizeof(int),
4562                         .mode           = 0444,
4563                         .proc_handler   = proc_dointvec,
4564                 },
4565 #endif
4566                 {
4567                         .procname       = "disable_ipv6",
4568                         .data           = &ipv6_devconf.disable_ipv6,
4569                         .maxlen         = sizeof(int),
4570                         .mode           = 0644,
4571                         .proc_handler   = addrconf_sysctl_disable,
4572                 },
4573                 {
4574                         .procname       = "accept_dad",
4575                         .data           = &ipv6_devconf.accept_dad,
4576                         .maxlen         = sizeof(int),
4577                         .mode           = 0644,
4578                         .proc_handler   = proc_dointvec,
4579                 },
4580                 {
4581                         .procname       = "force_tllao",
4582                         .data           = &ipv6_devconf.force_tllao,
4583                         .maxlen         = sizeof(int),
4584                         .mode           = 0644,
4585                         .proc_handler   = proc_dointvec
4586                 },
4587                 {
4588                         /* sentinel */
4589                 }
4590         },
4591 };
4592
4593 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4594                 struct inet6_dev *idev, struct ipv6_devconf *p)
4595 {
4596         int i;
4597         struct addrconf_sysctl_table *t;
4598
4599 #define ADDRCONF_CTL_PATH_DEV   3
4600
4601         struct ctl_path addrconf_ctl_path[] = {
4602                 { .procname = "net", },
4603                 { .procname = "ipv6", },
4604                 { .procname = "conf", },
4605                 { /* to be set */ },
4606                 { },
4607         };
4608
4609
4610         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4611         if (t == NULL)
4612                 goto out;
4613
4614         for (i = 0; t->addrconf_vars[i].data; i++) {
4615                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4616                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4617                 t->addrconf_vars[i].extra2 = net;
4618         }
4619
4620         /*
4621          * Make a copy of dev_name, because '.procname' is regarded as const
4622          * by sysctl and we wouldn't want anyone to change it under our feet
4623          * (see SIOCSIFNAME).
4624          */
4625         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4626         if (!t->dev_name)
4627                 goto free;
4628
4629         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4630
4631         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4632                         t->addrconf_vars);
4633         if (t->sysctl_header == NULL)
4634                 goto free_procname;
4635
4636         p->sysctl = t;
4637         return 0;
4638
4639 free_procname:
4640         kfree(t->dev_name);
4641 free:
4642         kfree(t);
4643 out:
4644         return -ENOBUFS;
4645 }
4646
4647 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4648 {
4649         struct addrconf_sysctl_table *t;
4650
4651         if (p->sysctl == NULL)
4652                 return;
4653
4654         t = p->sysctl;
4655         p->sysctl = NULL;
4656         unregister_net_sysctl_table(t->sysctl_header);
4657         kfree(t->dev_name);
4658         kfree(t);
4659 }
4660
4661 static void addrconf_sysctl_register(struct inet6_dev *idev)
4662 {
4663         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4664                               &ndisc_ifinfo_sysctl_change);
4665         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4666                                         idev, &idev->cnf);
4667 }
4668
4669 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4670 {
4671         __addrconf_sysctl_unregister(&idev->cnf);
4672         neigh_sysctl_unregister(idev->nd_parms);
4673 }
4674
4675
4676 #endif
4677
4678 static int __net_init addrconf_init_net(struct net *net)
4679 {
4680         int err;
4681         struct ipv6_devconf *all, *dflt;
4682
4683         err = -ENOMEM;
4684         all = &ipv6_devconf;
4685         dflt = &ipv6_devconf_dflt;
4686
4687         if (!net_eq(net, &init_net)) {
4688                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4689                 if (all == NULL)
4690                         goto err_alloc_all;
4691
4692                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4693                 if (dflt == NULL)
4694                         goto err_alloc_dflt;
4695         } else {
4696                 /* these will be inherited by all namespaces */
4697                 dflt->autoconf = ipv6_defaults.autoconf;
4698                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4699         }
4700
4701         net->ipv6.devconf_all = all;
4702         net->ipv6.devconf_dflt = dflt;
4703
4704 #ifdef CONFIG_SYSCTL
4705         err = __addrconf_sysctl_register(net, "all", NULL, all);
4706         if (err < 0)
4707                 goto err_reg_all;
4708
4709         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4710         if (err < 0)
4711                 goto err_reg_dflt;
4712 #endif
4713         return 0;
4714
4715 #ifdef CONFIG_SYSCTL
4716 err_reg_dflt:
4717         __addrconf_sysctl_unregister(all);
4718 err_reg_all:
4719         kfree(dflt);
4720 #endif
4721 err_alloc_dflt:
4722         kfree(all);
4723 err_alloc_all:
4724         return err;
4725 }
4726
4727 static void __net_exit addrconf_exit_net(struct net *net)
4728 {
4729 #ifdef CONFIG_SYSCTL
4730         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4731         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4732 #endif
4733         if (!net_eq(net, &init_net)) {
4734                 kfree(net->ipv6.devconf_dflt);
4735                 kfree(net->ipv6.devconf_all);
4736         }
4737 }
4738
4739 static struct pernet_operations addrconf_ops = {
4740         .init = addrconf_init_net,
4741         .exit = addrconf_exit_net,
4742 };
4743
4744 /*
4745  *      Device notifier
4746  */
4747
4748 int register_inet6addr_notifier(struct notifier_block *nb)
4749 {
4750         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4751 }
4752 EXPORT_SYMBOL(register_inet6addr_notifier);
4753
4754 int unregister_inet6addr_notifier(struct notifier_block *nb)
4755 {
4756         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4757 }
4758 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4759
4760 static struct rtnl_af_ops inet6_ops = {
4761         .family           = AF_INET6,
4762         .fill_link_af     = inet6_fill_link_af,
4763         .get_link_af_size = inet6_get_link_af_size,
4764 };
4765
4766 /*
4767  *      Init / cleanup code
4768  */
4769
4770 int __init addrconf_init(void)
4771 {
4772         int i, err;
4773
4774         err = ipv6_addr_label_init();
4775         if (err < 0) {
4776                 printk(KERN_CRIT "IPv6 Addrconf:"
4777                        " cannot initialize default policy table: %d.\n", err);
4778                 goto out;
4779         }
4780
4781         err = register_pernet_subsys(&addrconf_ops);
4782         if (err < 0)
4783                 goto out_addrlabel;
4784
4785         /* The addrconf netdev notifier requires that loopback_dev
4786          * has it's ipv6 private information allocated and setup
4787          * before it can bring up and give link-local addresses
4788          * to other devices which are up.
4789          *
4790          * Unfortunately, loopback_dev is not necessarily the first
4791          * entry in the global dev_base list of net devices.  In fact,
4792          * it is likely to be the very last entry on that list.
4793          * So this causes the notifier registry below to try and
4794          * give link-local addresses to all devices besides loopback_dev
4795          * first, then loopback_dev, which cases all the non-loopback_dev
4796          * devices to fail to get a link-local address.
4797          *
4798          * So, as a temporary fix, allocate the ipv6 structure for
4799          * loopback_dev first by hand.
4800          * Longer term, all of the dependencies ipv6 has upon the loopback
4801          * device and it being up should be removed.
4802          */
4803         rtnl_lock();
4804         if (!ipv6_add_dev(init_net.loopback_dev))
4805                 err = -ENOMEM;
4806         rtnl_unlock();
4807         if (err)
4808                 goto errlo;
4809
4810         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4811                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4812
4813         register_netdevice_notifier(&ipv6_dev_notf);
4814
4815         addrconf_verify(0);
4816
4817         err = rtnl_af_register(&inet6_ops);
4818         if (err < 0)
4819                 goto errout_af;
4820
4821         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4822                               NULL);
4823         if (err < 0)
4824                 goto errout;
4825
4826         /* Only the first call to __rtnl_register can fail */
4827         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4828         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4829         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4830                         inet6_dump_ifaddr, NULL);
4831         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4832                         inet6_dump_ifmcaddr, NULL);
4833         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4834                         inet6_dump_ifacaddr, NULL);
4835
4836         ipv6_addr_label_rtnl_register();
4837
4838         return 0;
4839 errout:
4840         rtnl_af_unregister(&inet6_ops);
4841 errout_af:
4842         unregister_netdevice_notifier(&ipv6_dev_notf);
4843 errlo:
4844         unregister_pernet_subsys(&addrconf_ops);
4845 out_addrlabel:
4846         ipv6_addr_label_cleanup();
4847 out:
4848         return err;
4849 }
4850
4851 void addrconf_cleanup(void)
4852 {
4853         struct net_device *dev;
4854         int i;
4855
4856         unregister_netdevice_notifier(&ipv6_dev_notf);
4857         unregister_pernet_subsys(&addrconf_ops);
4858         ipv6_addr_label_cleanup();
4859
4860         rtnl_lock();
4861
4862         __rtnl_af_unregister(&inet6_ops);
4863
4864         /* clean dev list */
4865         for_each_netdev(&init_net, dev) {
4866                 if (__in6_dev_get(dev) == NULL)
4867                         continue;
4868                 addrconf_ifdown(dev, 1);
4869         }
4870         addrconf_ifdown(init_net.loopback_dev, 2);
4871
4872         /*
4873          *      Check hash table.
4874          */
4875         spin_lock_bh(&addrconf_hash_lock);
4876         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4877                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4878         spin_unlock_bh(&addrconf_hash_lock);
4879
4880         del_timer(&addr_chk_timer);
4881         rtnl_unlock();
4882 }