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         return ndev;
 438 }
 439
 440 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 441 {
 442         struct inet6_dev *idev;
 443
 444         ASSERT_RTNL();
 445
 446         idev = __in6_dev_get(dev);
 447         if (!idev) {
 448                 idev = ipv6_add_dev(dev);
 449                 if (!idev)
 450                         return NULL;
 451         }
 452
 453         if (dev->flags&IFF_UP)
 454                 ipv6_mc_up(idev);
 455         return idev;
 456 }
 457
 458 #ifdef CONFIG_SYSCTL
 459 static void dev_forward_change(struct inet6_dev *idev)
 460 {
 461         struct net_device *dev;
 462         struct inet6_ifaddr *ifa;
 463
 464         if (!idev)
 465                 return;
 466         dev = idev->dev;
 467         if (idev->cnf.forwarding)
 468                 dev_disable_lro(dev);
 469         if (dev && (dev->flags & IFF_MULTICAST)) {
 470                 if (idev->cnf.forwarding)
 471                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 472                 else
 473                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 474         }
 475
 476         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 477                 if (ifa->flags&IFA_F_TENTATIVE)
 478                         continue;
 479                 if (idev->cnf.forwarding)
 480                         addrconf_join_anycast(ifa);
 481                 else
 482                         addrconf_leave_anycast(ifa);
 483         }
 484 }
 485
 486
 487 static void addrconf_forward_change(struct net *net, __s32 newf)
 488 {
 489         struct net_device *dev;
 490         struct inet6_dev *idev;
 491
 492         rcu_read_lock();
 493         for_each_netdev_rcu(net, dev) {
 494                 idev = __in6_dev_get(dev);
 495                 if (idev) {
 496                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 497                         idev->cnf.forwarding = newf;
 498                         if (changed)
 499                                 dev_forward_change(idev);
 500                 }
 501         }
 502         rcu_read_unlock();
 503 }
 504
 505 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 506 {
 507         struct net *net;
 508         int old;
 509
 510         if (!rtnl_trylock())
 511                 return restart_syscall();
 512
 513         net = (struct net *)table->extra2;
 514         old = *p;
 515         *p = newf;
 516
 517         if (p == &net->ipv6.devconf_dflt->forwarding) {
 518                 rtnl_unlock();
 519                 return 0;
 520         }
 521
 522         if (p == &net->ipv6.devconf_all->forwarding) {
 523                 net->ipv6.devconf_dflt->forwarding = newf;
 524                 addrconf_forward_change(net, newf);
 525         } else if ((!newf) ^ (!old))
 526                 dev_forward_change((struct inet6_dev *)table->extra1);
 527         rtnl_unlock();
 528
 529         if (newf)
 530                 rt6_purge_dflt_routers(net);
 531         return 1;
 532 }
 533 #endif
 534
 535 /* Nobody refers to this ifaddr, destroy it */
 536 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 537 {
 538         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 539
 540 #ifdef NET_REFCNT_DEBUG
 541         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 542 #endif
 543
 544         in6_dev_put(ifp->idev);
 545
 546         if (del_timer(&ifp->timer))
 547                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 548
 549         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 550                 pr_warning("Freeing alive inet6 address %p\n", ifp);
 551                 return;
 552         }
 553         dst_release(&ifp->rt->dst);
 554
 555         kfree_rcu(ifp, rcu);
 556 }
 557
 558 static void
 559 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 560 {
 561         struct list_head *p;
 562         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 563
 564         /*
 565          * Each device address list is sorted in order of scope -
 566          * global before linklocal.
 567          */
 568         list_for_each(p, &idev->addr_list) {
 569                 struct inet6_ifaddr *ifa
 570                         = list_entry(p, struct inet6_ifaddr, if_list);
 571                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 572                         break;
 573         }
 574
 575         list_add_tail(&ifp->if_list, p);
 576 }
 577
 578 static u32 ipv6_addr_hash(const struct in6_addr *addr)
 579 {
 580         /*
 581          * We perform the hash function over the last 64 bits of the address
 582          * This will include the IEEE address token on links that support it.
 583          */
 584         return jhash_2words((__force u32)addr->s6_addr32[2],
 585                             (__force u32)addr->s6_addr32[3], 0)
 586                 & (IN6_ADDR_HSIZE - 1);
 587 }
 588
 589 /* On success it returns ifp with increased reference count */
 590
 591 static struct inet6_ifaddr *
 592 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 593               int scope, u32 flags)
 594 {
 595         struct inet6_ifaddr *ifa = NULL;
 596         struct rt6_info *rt;
 597         unsigned int hash;
 598         int err = 0;
 599         int addr_type = ipv6_addr_type(addr);
 600
 601         if (addr_type == IPV6_ADDR_ANY ||
 602             addr_type & IPV6_ADDR_MULTICAST ||
 603             (!(idev->dev->flags & IFF_LOOPBACK) &&
 604              addr_type & IPV6_ADDR_LOOPBACK))
 605                 return ERR_PTR(-EADDRNOTAVAIL);
 606
 607         rcu_read_lock_bh();
 608         if (idev->dead) {
 609                 err = -ENODEV;                  /*XXX*/
 610                 goto out2;
 611         }
 612
 613         if (idev->cnf.disable_ipv6) {
 614                 err = -EACCES;
 615                 goto out2;
 616         }
 617
 618         spin_lock(&addrconf_hash_lock);
 619
 620         /* Ignore adding duplicate addresses on an interface */
 621         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 622                 ADBG(("ipv6_add_addr: already assigned\n"));
 623                 err = -EEXIST;
 624                 goto out;
 625         }
 626
 627         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 628
 629         if (ifa == NULL) {
 630                 ADBG(("ipv6_add_addr: malloc failed\n"));
 631                 err = -ENOBUFS;
 632                 goto out;
 633         }
 634
 635         rt = addrconf_dst_alloc(idev, addr, false);
 636         if (IS_ERR(rt)) {
 637                 err = PTR_ERR(rt);
 638                 goto out;
 639         }
 640
 641         ifa->addr = *addr;
 642
 643         spin_lock_init(&ifa->lock);
 644         spin_lock_init(&ifa->state_lock);
 645         init_timer(&ifa->timer);
 646         INIT_HLIST_NODE(&ifa->addr_lst);
 647         ifa->timer.data = (unsigned long) ifa;
 648         ifa->scope = scope;
 649         ifa->prefix_len = pfxlen;
 650         ifa->flags = flags | IFA_F_TENTATIVE;
 651         ifa->cstamp = ifa->tstamp = jiffies;
 652
 653         ifa->rt = rt;
 654
 655         ifa->idev = idev;
 656         in6_dev_hold(idev);
 657         /* For caller */
 658         in6_ifa_hold(ifa);
 659
 660         /* Add to big hash table */
 661         hash = ipv6_addr_hash(addr);
 662
 663         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 664         spin_unlock(&addrconf_hash_lock);
 665
 666         write_lock(&idev->lock);
 667         /* Add to inet6_dev unicast addr list. */
 668         ipv6_link_dev_addr(idev, ifa);
 669
 670 #ifdef CONFIG_IPV6_PRIVACY
 671         if (ifa->flags&IFA_F_TEMPORARY) {
 672                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 673                 in6_ifa_hold(ifa);
 674         }
 675 #endif
 676
 677         in6_ifa_hold(ifa);
 678         write_unlock(&idev->lock);
 679 out2:
 680         rcu_read_unlock_bh();
 681
 682         if (likely(err == 0))
 683                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 684         else {
 685                 kfree(ifa);
 686                 ifa = ERR_PTR(err);
 687         }
 688
 689         return ifa;
 690 out:
 691         spin_unlock(&addrconf_hash_lock);
 692         goto out2;
 693 }
 694
 695 /* This function wants to get referenced ifp and releases it before return */
 696
 697 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 698 {
 699         struct inet6_ifaddr *ifa, *ifn;
 700         struct inet6_dev *idev = ifp->idev;
 701         int state;
 702         int deleted = 0, onlink = 0;
 703         unsigned long expires = jiffies;
 704
 705         spin_lock_bh(&ifp->state_lock);
 706         state = ifp->state;
 707         ifp->state = INET6_IFADDR_STATE_DEAD;
 708         spin_unlock_bh(&ifp->state_lock);
 709
 710         if (state == INET6_IFADDR_STATE_DEAD)
 711                 goto out;
 712
 713         spin_lock_bh(&addrconf_hash_lock);
 714         hlist_del_init_rcu(&ifp->addr_lst);
 715         spin_unlock_bh(&addrconf_hash_lock);
 716
 717         write_lock_bh(&idev->lock);
 718 #ifdef CONFIG_IPV6_PRIVACY
 719         if (ifp->flags&IFA_F_TEMPORARY) {
 720                 list_del(&ifp->tmp_list);
 721                 if (ifp->ifpub) {
 722                         in6_ifa_put(ifp->ifpub);
 723                         ifp->ifpub = NULL;
 724                 }
 725                 __in6_ifa_put(ifp);
 726         }
 727 #endif
 728
 729         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 730                 if (ifa == ifp) {
 731                         list_del_init(&ifp->if_list);
 732                         __in6_ifa_put(ifp);
 733
 734                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 735                                 break;
 736                         deleted = 1;
 737                         continue;
 738                 } else if (ifp->flags & IFA_F_PERMANENT) {
 739                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 740                                               ifp->prefix_len)) {
 741                                 if (ifa->flags & IFA_F_PERMANENT) {
 742                                         onlink = 1;
 743                                         if (deleted)
 744                                                 break;
 745                                 } else {
 746                                         unsigned long lifetime;
 747
 748                                         if (!onlink)
 749                                                 onlink = -1;
 750
 751                                         spin_lock(&ifa->lock);
 752
 753                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 754                                         /*
 755                                          * Note: Because this address is
 756                                          * not permanent, lifetime <
 757                                          * LONG_MAX / HZ here.
 758                                          */
 759                                         if (time_before(expires,
 760                                                         ifa->tstamp + lifetime * HZ))
 761                                                 expires = ifa->tstamp + lifetime * HZ;
 762                                         spin_unlock(&ifa->lock);
 763                                 }
 764                         }
 765                 }
 766         }
 767         write_unlock_bh(&idev->lock);
 768
 769         addrconf_del_timer(ifp);
 770
 771         ipv6_ifa_notify(RTM_DELADDR, ifp);
 772
 773         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 774
 775         /*
 776          * Purge or update corresponding prefix
 777          *
 778          * 1) we don't purge prefix here if address was not permanent.
 779          *    prefix is managed by its own lifetime.
 780          * 2) if there're no addresses, delete prefix.
 781          * 3) if there're still other permanent address(es),
 782          *    corresponding prefix is still permanent.
 783          * 4) otherwise, update prefix lifetime to the
 784          *    longest valid lifetime among the corresponding
 785          *    addresses on the device.
 786          *    Note: subsequent RA will update lifetime.
 787          *
 788          * --yoshfuji
 789          */
 790         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 791                 struct in6_addr prefix;
 792                 struct rt6_info *rt;
 793                 struct net *net = dev_net(ifp->idev->dev);
 794                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 795                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 796
 797                 if (rt && addrconf_is_prefix_route(rt)) {
 798                         if (onlink == 0) {
 799                                 ip6_del_rt(rt);
 800                                 rt = NULL;
 801                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 802                                 rt->dst.expires = expires;
 803                                 rt->rt6i_flags |= RTF_EXPIRES;
 804                         }
 805                 }
 806                 dst_release(&rt->dst);
 807         }
 808
 809         /* clean up prefsrc entries */
 810         rt6_remove_prefsrc(ifp);
 811 out:
 812         in6_ifa_put(ifp);
 813 }
 814
 815 #ifdef CONFIG_IPV6_PRIVACY
 816 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 817 {
 818         struct inet6_dev *idev = ifp->idev;
 819         struct in6_addr addr, *tmpaddr;
 820         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
 821         unsigned long regen_advance;
 822         int tmp_plen;
 823         int ret = 0;
 824         int max_addresses;
 825         u32 addr_flags;
 826         unsigned long now = jiffies;
 827
 828         write_lock(&idev->lock);
 829         if (ift) {
 830                 spin_lock_bh(&ift->lock);
 831                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 832                 spin_unlock_bh(&ift->lock);
 833                 tmpaddr = &addr;
 834         } else {
 835                 tmpaddr = NULL;
 836         }
 837 retry:
 838         in6_dev_hold(idev);
 839         if (idev->cnf.use_tempaddr <= 0) {
 840                 write_unlock(&idev->lock);
 841                 printk(KERN_INFO
 842                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 843                 in6_dev_put(idev);
 844                 ret = -1;
 845                 goto out;
 846         }
 847         spin_lock_bh(&ifp->lock);
 848         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 849                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 850                 spin_unlock_bh(&ifp->lock);
 851                 write_unlock(&idev->lock);
 852                 printk(KERN_WARNING
 853                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 854                 in6_dev_put(idev);
 855                 ret = -1;
 856                 goto out;
 857         }
 858         in6_ifa_hold(ifp);
 859         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 860         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 861                 spin_unlock_bh(&ifp->lock);
 862                 write_unlock(&idev->lock);
 863                 printk(KERN_WARNING
 864                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 865                 in6_ifa_put(ifp);
 866                 in6_dev_put(idev);
 867                 ret = -1;
 868                 goto out;
 869         }
 870         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 871         age = (now - ifp->tstamp) / HZ;
 872         tmp_valid_lft = min_t(__u32,
 873                               ifp->valid_lft,
 874                               idev->cnf.temp_valid_lft + age);
 875         tmp_prefered_lft = min_t(__u32,
 876                                  ifp->prefered_lft,
 877                                  idev->cnf.temp_prefered_lft + age -
 878                                  idev->cnf.max_desync_factor);
 879         tmp_plen = ifp->prefix_len;
 880         max_addresses = idev->cnf.max_addresses;
 881         tmp_tstamp = ifp->tstamp;
 882         spin_unlock_bh(&ifp->lock);
 883
 884         regen_advance = idev->cnf.regen_max_retry *
 885                         idev->cnf.dad_transmits *
 886                         idev->nd_parms->retrans_time / HZ;
 887         write_unlock(&idev->lock);
 888
 889         /* A temporary address is created only if this calculated Preferred
 890          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 891          * an implementation must not create a temporary address with a zero
 892          * Preferred Lifetime.
 893          */
 894         if (tmp_prefered_lft <= regen_advance) {
 895                 in6_ifa_put(ifp);
 896                 in6_dev_put(idev);
 897                 ret = -1;
 898                 goto out;
 899         }
 900
 901         addr_flags = IFA_F_TEMPORARY;
 902         /* set in addrconf_prefix_rcv() */
 903         if (ifp->flags & IFA_F_OPTIMISTIC)
 904                 addr_flags |= IFA_F_OPTIMISTIC;
 905
 906         ift = !max_addresses ||
 907               ipv6_count_addresses(idev) < max_addresses ?
 908                 ipv6_add_addr(idev, &addr, tmp_plen,
 909                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 910                               addr_flags) : NULL;
 911         if (!ift || IS_ERR(ift)) {
 912                 in6_ifa_put(ifp);
 913                 in6_dev_put(idev);
 914                 printk(KERN_INFO
 915                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 916                 tmpaddr = &addr;
 917                 write_lock(&idev->lock);
 918                 goto retry;
 919         }
 920
 921         spin_lock_bh(&ift->lock);
 922         ift->ifpub = ifp;
 923         ift->valid_lft = tmp_valid_lft;
 924         ift->prefered_lft = tmp_prefered_lft;
 925         ift->cstamp = now;
 926         ift->tstamp = tmp_tstamp;
 927         spin_unlock_bh(&ift->lock);
 928
 929         addrconf_dad_start(ift, 0);
 930         in6_ifa_put(ift);
 931         in6_dev_put(idev);
 932 out:
 933         return ret;
 934 }
 935 #endif
 936
 937 /*
 938  *      Choose an appropriate source address (RFC3484)
 939  */
 940 enum {
 941         IPV6_SADDR_RULE_INIT = 0,
 942         IPV6_SADDR_RULE_LOCAL,
 943         IPV6_SADDR_RULE_SCOPE,
 944         IPV6_SADDR_RULE_PREFERRED,
 945 #ifdef CONFIG_IPV6_MIP6
 946         IPV6_SADDR_RULE_HOA,
 947 #endif
 948         IPV6_SADDR_RULE_OIF,
 949         IPV6_SADDR_RULE_LABEL,
 950 #ifdef CONFIG_IPV6_PRIVACY
 951         IPV6_SADDR_RULE_PRIVACY,
 952 #endif
 953         IPV6_SADDR_RULE_ORCHID,
 954         IPV6_SADDR_RULE_PREFIX,
 955         IPV6_SADDR_RULE_MAX
 956 };
 957
 958 struct ipv6_saddr_score {
 959         int                     rule;
 960         int                     addr_type;
 961         struct inet6_ifaddr     *ifa;
 962         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 963         int                     scopedist;
 964         int                     matchlen;
 965 };
 966
 967 struct ipv6_saddr_dst {
 968         const struct in6_addr *addr;
 969         int ifindex;
 970         int scope;
 971         int label;
 972         unsigned int prefs;
 973 };
 974
 975 static inline int ipv6_saddr_preferred(int type)
 976 {
 977         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
 978                 return 1;
 979         return 0;
 980 }
 981
 982 static int ipv6_get_saddr_eval(struct net *net,
 983                                struct ipv6_saddr_score *score,
 984                                struct ipv6_saddr_dst *dst,
 985                                int i)
 986 {
 987         int ret;
 988
 989         if (i <= score->rule) {
 990                 switch (i) {
 991                 case IPV6_SADDR_RULE_SCOPE:
 992                         ret = score->scopedist;
 993                         break;
 994                 case IPV6_SADDR_RULE_PREFIX:
 995                         ret = score->matchlen;
 996                         break;
 997                 default:
 998                         ret = !!test_bit(i, score->scorebits);
 999                 }
1000                 goto out;
1001         }
1002
1003         switch (i) {
1004         case IPV6_SADDR_RULE_INIT:
1005                 /* Rule 0: remember if hiscore is not ready yet */
1006                 ret = !!score->ifa;
1007                 break;
1008         case IPV6_SADDR_RULE_LOCAL:
1009                 /* Rule 1: Prefer same address */
1010                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1011                 break;
1012         case IPV6_SADDR_RULE_SCOPE:
1013                 /* Rule 2: Prefer appropriate scope
1014                  *
1015                  *      ret
1016                  *       ^
1017                  *    -1 |  d 15
1018                  *    ---+--+-+---> scope
1019                  *       |
1020                  *       |             d is scope of the destination.
1021                  *  B-d  |  \
1022                  *       |   \      <- smaller scope is better if
1023                  *  B-15 |    \        if scope is enough for destinaion.
1024                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1025                  * d-C-1 | /
1026                  *       |/         <- greater is better
1027                  *   -C  /             if scope is not enough for destination.
1028                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1029                  *
1030                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1031                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1032                  * Assume B = 0 and we get C > 29.
1033                  */
1034                 ret = __ipv6_addr_src_scope(score->addr_type);
1035                 if (ret >= dst->scope)
1036                         ret = -ret;
1037                 else
1038                         ret -= 128;     /* 30 is enough */
1039                 score->scopedist = ret;
1040                 break;
1041         case IPV6_SADDR_RULE_PREFERRED:
1042                 /* Rule 3: Avoid deprecated and optimistic addresses */
1043                 ret = ipv6_saddr_preferred(score->addr_type) ||
1044                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1045                 break;
1046 #ifdef CONFIG_IPV6_MIP6
1047         case IPV6_SADDR_RULE_HOA:
1048             {
1049                 /* Rule 4: Prefer home address */
1050                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1051                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1052                 break;
1053             }
1054 #endif
1055         case IPV6_SADDR_RULE_OIF:
1056                 /* Rule 5: Prefer outgoing interface */
1057                 ret = (!dst->ifindex ||
1058                        dst->ifindex == score->ifa->idev->dev->ifindex);
1059                 break;
1060         case IPV6_SADDR_RULE_LABEL:
1061                 /* Rule 6: Prefer matching label */
1062                 ret = ipv6_addr_label(net,
1063                                       &score->ifa->addr, score->addr_type,
1064                                       score->ifa->idev->dev->ifindex) == dst->label;
1065                 break;
1066 #ifdef CONFIG_IPV6_PRIVACY
1067         case IPV6_SADDR_RULE_PRIVACY:
1068             {
1069                 /* Rule 7: Prefer public address
1070                  * Note: prefer temporary address if use_tempaddr >= 2
1071                  */
1072                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1073                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1074                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1075                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1076                 break;
1077             }
1078 #endif
1079         case IPV6_SADDR_RULE_ORCHID:
1080                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1081                  *          non-ORCHID vs non-ORCHID
1082                  */
1083                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1084                         ipv6_addr_orchid(dst->addr));
1085                 break;
1086         case IPV6_SADDR_RULE_PREFIX:
1087                 /* Rule 8: Use longest matching prefix */
1088                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1089                                                        dst->addr);
1090                 break;
1091         default:
1092                 ret = 0;
1093         }
1094
1095         if (ret)
1096                 __set_bit(i, score->scorebits);
1097         score->rule = i;
1098 out:
1099         return ret;
1100 }
1101
1102 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1103                        const struct in6_addr *daddr, unsigned int prefs,
1104                        struct in6_addr *saddr)
1105 {
1106         struct ipv6_saddr_score scores[2],
1107                                 *score = &scores[0], *hiscore = &scores[1];
1108         struct ipv6_saddr_dst dst;
1109         struct net_device *dev;
1110         int dst_type;
1111
1112         dst_type = __ipv6_addr_type(daddr);
1113         dst.addr = daddr;
1114         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1115         dst.scope = __ipv6_addr_src_scope(dst_type);
1116         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1117         dst.prefs = prefs;
1118
1119         hiscore->rule = -1;
1120         hiscore->ifa = NULL;
1121
1122         rcu_read_lock();
1123
1124         for_each_netdev_rcu(net, dev) {
1125                 struct inet6_dev *idev;
1126
1127                 /* Candidate Source Address (section 4)
1128                  *  - multicast and link-local destination address,
1129                  *    the set of candidate source address MUST only
1130                  *    include addresses assigned to interfaces
1131                  *    belonging to the same link as the outgoing
1132                  *    interface.
1133                  * (- For site-local destination addresses, the
1134                  *    set of candidate source addresses MUST only
1135                  *    include addresses assigned to interfaces
1136                  *    belonging to the same site as the outgoing
1137                  *    interface.)
1138                  */
1139                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1140                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1141                     dst.ifindex && dev->ifindex != dst.ifindex)
1142                         continue;
1143
1144                 idev = __in6_dev_get(dev);
1145                 if (!idev)
1146                         continue;
1147
1148                 read_lock_bh(&idev->lock);
1149                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1150                         int i;
1151
1152                         /*
1153                          * - Tentative Address (RFC2462 section 5.4)
1154                          *  - A tentative address is not considered
1155                          *    "assigned to an interface" in the traditional
1156                          *    sense, unless it is also flagged as optimistic.
1157                          * - Candidate Source Address (section 4)
1158                          *  - In any case, anycast addresses, multicast
1159                          *    addresses, and the unspecified address MUST
1160                          *    NOT be included in a candidate set.
1161                          */
1162                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1163                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1164                                 continue;
1165
1166                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1167
1168                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1169                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1170                                 LIMIT_NETDEBUG(KERN_DEBUG
1171                                                "ADDRCONF: unspecified / multicast address "
1172                                                "assigned as unicast address on %s",
1173                                                dev->name);
1174                                 continue;
1175                         }
1176
1177                         score->rule = -1;
1178                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1179
1180                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1181                                 int minihiscore, miniscore;
1182
1183                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1184                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1185
1186                                 if (minihiscore > miniscore) {
1187                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1188                                             score->scopedist > 0) {
1189                                                 /*
1190                                                  * special case:
1191                                                  * each remaining entry
1192                                                  * has too small (not enough)
1193                                                  * scope, because ifa entries
1194                                                  * are sorted by their scope
1195                                                  * values.
1196                                                  */
1197                                                 goto try_nextdev;
1198                                         }
1199                                         break;
1200                                 } else if (minihiscore < miniscore) {
1201                                         if (hiscore->ifa)
1202                                                 in6_ifa_put(hiscore->ifa);
1203
1204                                         in6_ifa_hold(score->ifa);
1205
1206                                         swap(hiscore, score);
1207
1208                                         /* restore our iterator */
1209                                         score->ifa = hiscore->ifa;
1210
1211                                         break;
1212                                 }
1213                         }
1214                 }
1215 try_nextdev:
1216                 read_unlock_bh(&idev->lock);
1217         }
1218         rcu_read_unlock();
1219
1220         if (!hiscore->ifa)
1221                 return -EADDRNOTAVAIL;
1222
1223         *saddr = hiscore->ifa->addr;
1224         in6_ifa_put(hiscore->ifa);
1225         return 0;
1226 }
1227 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1228
1229 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1230                     unsigned char banned_flags)
1231 {
1232         struct inet6_dev *idev;
1233         int err = -EADDRNOTAVAIL;
1234
1235         rcu_read_lock();
1236         idev = __in6_dev_get(dev);
1237         if (idev) {
1238                 struct inet6_ifaddr *ifp;
1239
1240                 read_lock_bh(&idev->lock);
1241                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1242                         if (ifp->scope == IFA_LINK &&
1243                             !(ifp->flags & banned_flags)) {
1244                                 *addr = ifp->addr;
1245                                 err = 0;
1246                                 break;
1247                         }
1248                 }
1249                 read_unlock_bh(&idev->lock);
1250         }
1251         rcu_read_unlock();
1252         return err;
1253 }
1254
1255 static int ipv6_count_addresses(struct inet6_dev *idev)
1256 {
1257         int cnt = 0;
1258         struct inet6_ifaddr *ifp;
1259
1260         read_lock_bh(&idev->lock);
1261         list_for_each_entry(ifp, &idev->addr_list, if_list)
1262                 cnt++;
1263         read_unlock_bh(&idev->lock);
1264         return cnt;
1265 }
1266
1267 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1268                   struct net_device *dev, int strict)
1269 {
1270         struct inet6_ifaddr *ifp;
1271         struct hlist_node *node;
1272         unsigned int hash = ipv6_addr_hash(addr);
1273
1274         rcu_read_lock_bh();
1275         hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1276                 if (!net_eq(dev_net(ifp->idev->dev), net))
1277                         continue;
1278                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1279                     !(ifp->flags&IFA_F_TENTATIVE) &&
1280                     (dev == NULL || ifp->idev->dev == dev ||
1281                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1282                         rcu_read_unlock_bh();
1283                         return 1;
1284                 }
1285         }
1286
1287         rcu_read_unlock_bh();
1288         return 0;
1289 }
1290 EXPORT_SYMBOL(ipv6_chk_addr);
1291
1292 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1293                                struct net_device *dev)
1294 {
1295         unsigned int hash = ipv6_addr_hash(addr);
1296         struct inet6_ifaddr *ifp;
1297         struct hlist_node *node;
1298
1299         hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1300                 if (!net_eq(dev_net(ifp->idev->dev), net))
1301                         continue;
1302                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1303                         if (dev == NULL || ifp->idev->dev == dev)
1304                                 return true;
1305                 }
1306         }
1307         return false;
1308 }
1309
1310 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1311 {
1312         struct inet6_dev *idev;
1313         struct inet6_ifaddr *ifa;
1314         int     onlink;
1315
1316         onlink = 0;
1317         rcu_read_lock();
1318         idev = __in6_dev_get(dev);
1319         if (idev) {
1320                 read_lock_bh(&idev->lock);
1321                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1322                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1323                                                    ifa->prefix_len);
1324                         if (onlink)
1325                                 break;
1326                 }
1327                 read_unlock_bh(&idev->lock);
1328         }
1329         rcu_read_unlock();
1330         return onlink;
1331 }
1332
1333 EXPORT_SYMBOL(ipv6_chk_prefix);
1334
1335 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1336                                      struct net_device *dev, int strict)
1337 {
1338         struct inet6_ifaddr *ifp, *result = NULL;
1339         unsigned int hash = ipv6_addr_hash(addr);
1340         struct hlist_node *node;
1341
1342         rcu_read_lock_bh();
1343         hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1344                 if (!net_eq(dev_net(ifp->idev->dev), net))
1345                         continue;
1346                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1347                         if (dev == NULL || ifp->idev->dev == dev ||
1348                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1349                                 result = ifp;
1350                                 in6_ifa_hold(ifp);
1351                                 break;
1352                         }
1353                 }
1354         }
1355         rcu_read_unlock_bh();
1356
1357         return result;
1358 }
1359
1360 /* Gets referenced address, destroys ifaddr */
1361
1362 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1363 {
1364         if (ifp->flags&IFA_F_PERMANENT) {
1365                 spin_lock_bh(&ifp->lock);
1366                 addrconf_del_timer(ifp);
1367                 ifp->flags |= IFA_F_TENTATIVE;
1368                 if (dad_failed)
1369                         ifp->flags |= IFA_F_DADFAILED;
1370                 spin_unlock_bh(&ifp->lock);
1371                 if (dad_failed)
1372                         ipv6_ifa_notify(0, ifp);
1373                 in6_ifa_put(ifp);
1374 #ifdef CONFIG_IPV6_PRIVACY
1375         } else if (ifp->flags&IFA_F_TEMPORARY) {
1376                 struct inet6_ifaddr *ifpub;
1377                 spin_lock_bh(&ifp->lock);
1378                 ifpub = ifp->ifpub;
1379                 if (ifpub) {
1380                         in6_ifa_hold(ifpub);
1381                         spin_unlock_bh(&ifp->lock);
1382                         ipv6_create_tempaddr(ifpub, ifp);
1383                         in6_ifa_put(ifpub);
1384                 } else {
1385                         spin_unlock_bh(&ifp->lock);
1386                 }
1387                 ipv6_del_addr(ifp);
1388 #endif
1389         } else
1390                 ipv6_del_addr(ifp);
1391 }
1392
1393 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1394 {
1395         int err = -ENOENT;
1396
1397         spin_lock(&ifp->state_lock);
1398         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1399                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1400                 err = 0;
1401         }
1402         spin_unlock(&ifp->state_lock);
1403
1404         return err;
1405 }
1406
1407 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1408 {
1409         struct inet6_dev *idev = ifp->idev;
1410
1411         if (addrconf_dad_end(ifp)) {
1412                 in6_ifa_put(ifp);
1413                 return;
1414         }
1415
1416         if (net_ratelimit())
1417                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1418                         ifp->idev->dev->name, &ifp->addr);
1419
1420         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1421                 struct in6_addr addr;
1422
1423                 addr.s6_addr32[0] = htonl(0xfe800000);
1424                 addr.s6_addr32[1] = 0;
1425
1426                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1427                     ipv6_addr_equal(&ifp->addr, &addr)) {
1428                         /* DAD failed for link-local based on MAC address */
1429                         idev->cnf.disable_ipv6 = 1;
1430
1431                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1432                                 ifp->idev->dev->name);
1433                 }
1434         }
1435
1436         addrconf_dad_stop(ifp, 1);
1437 }
1438
1439 /* Join to solicited addr multicast group. */
1440
1441 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1442 {
1443         struct in6_addr maddr;
1444
1445         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1446                 return;
1447
1448         addrconf_addr_solict_mult(addr, &maddr);
1449         ipv6_dev_mc_inc(dev, &maddr);
1450 }
1451
1452 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1453 {
1454         struct in6_addr maddr;
1455
1456         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1457                 return;
1458
1459         addrconf_addr_solict_mult(addr, &maddr);
1460         __ipv6_dev_mc_dec(idev, &maddr);
1461 }
1462
1463 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1464 {
1465         struct in6_addr addr;
1466         if (ifp->prefix_len == 127) /* RFC 6164 */
1467                 return;
1468         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1469         if (ipv6_addr_any(&addr))
1470                 return;
1471         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1472 }
1473
1474 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1475 {
1476         struct in6_addr addr;
1477         if (ifp->prefix_len == 127) /* RFC 6164 */
1478                 return;
1479         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1480         if (ipv6_addr_any(&addr))
1481                 return;
1482         __ipv6_dev_ac_dec(ifp->idev, &addr);
1483 }
1484
1485 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1486 {
1487         if (dev->addr_len != ETH_ALEN)
1488                 return -1;
1489         memcpy(eui, dev->dev_addr, 3);
1490         memcpy(eui + 5, dev->dev_addr + 3, 3);
1491
1492         /*
1493          * The zSeries OSA network cards can be shared among various
1494          * OS instances, but the OSA cards have only one MAC address.
1495          * This leads to duplicate address conflicts in conjunction
1496          * with IPv6 if more than one instance uses the same card.
1497          *
1498          * The driver for these cards can deliver a unique 16-bit
1499          * identifier for each instance sharing the same card.  It is
1500          * placed instead of 0xFFFE in the interface identifier.  The
1501          * "u" bit of the interface identifier is not inverted in this
1502          * case.  Hence the resulting interface identifier has local
1503          * scope according to RFC2373.
1504          */
1505         if (dev->dev_id) {
1506                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1507                 eui[4] = dev->dev_id & 0xFF;
1508         } else {
1509                 eui[3] = 0xFF;
1510                 eui[4] = 0xFE;
1511                 eui[0] ^= 2;
1512         }
1513         return 0;
1514 }
1515
1516 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1517 {
1518         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1519         if (dev->addr_len != ARCNET_ALEN)
1520                 return -1;
1521         memset(eui, 0, 7);
1522         eui[7] = *(u8*)dev->dev_addr;
1523         return 0;
1524 }
1525
1526 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1527 {
1528         if (dev->addr_len != INFINIBAND_ALEN)
1529                 return -1;
1530         memcpy(eui, dev->dev_addr + 12, 8);
1531         eui[0] |= 2;
1532         return 0;
1533 }
1534
1535 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1536 {
1537         if (addr == 0)
1538                 return -1;
1539         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1540                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1541                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1542                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1543                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1544                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1545         eui[1] = 0;
1546         eui[2] = 0x5E;
1547         eui[3] = 0xFE;
1548         memcpy(eui + 4, &addr, 4);
1549         return 0;
1550 }
1551
1552 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1553 {
1554         if (dev->priv_flags & IFF_ISATAP)
1555                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1556         return -1;
1557 }
1558
1559 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1560 {
1561         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1562 }
1563
1564 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1565 {
1566         switch (dev->type) {
1567         case ARPHRD_ETHER:
1568         case ARPHRD_FDDI:
1569         case ARPHRD_IEEE802_TR:
1570                 return addrconf_ifid_eui48(eui, dev);
1571         case ARPHRD_ARCNET:
1572                 return addrconf_ifid_arcnet(eui, dev);
1573         case ARPHRD_INFINIBAND:
1574                 return addrconf_ifid_infiniband(eui, dev);
1575         case ARPHRD_SIT:
1576                 return addrconf_ifid_sit(eui, dev);
1577         case ARPHRD_IPGRE:
1578                 return addrconf_ifid_gre(eui, dev);
1579         }
1580         return -1;
1581 }
1582
1583 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1584 {
1585         int err = -1;
1586         struct inet6_ifaddr *ifp;
1587
1588         read_lock_bh(&idev->lock);
1589         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1590                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1591                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1592                         err = 0;
1593                         break;
1594                 }
1595         }
1596         read_unlock_bh(&idev->lock);
1597         return err;
1598 }
1599
1600 #ifdef CONFIG_IPV6_PRIVACY
1601 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1602 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1603 {
1604 regen:
1605         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1606         idev->rndid[0] &= ~0x02;
1607
1608         /*
1609          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1610          * check if generated address is not inappropriate
1611          *
1612          *  - Reserved subnet anycast (RFC 2526)
1613          *      11111101 11....11 1xxxxxxx
1614          *  - ISATAP (RFC4214) 6.1
1615          *      00-00-5E-FE-xx-xx-xx-xx
1616          *  - value 0
1617          *  - XXX: already assigned to an address on the device
1618          */
1619         if (idev->rndid[0] == 0xfd &&
1620             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1621             (idev->rndid[7]&0x80))
1622                 goto regen;
1623         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1624                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1625                         goto regen;
1626                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1627                         goto regen;
1628         }
1629
1630         return 0;
1631 }
1632
1633 static void ipv6_regen_rndid(unsigned long data)
1634 {
1635         struct inet6_dev *idev = (struct inet6_dev *) data;
1636         unsigned long expires;
1637
1638         rcu_read_lock_bh();
1639         write_lock_bh(&idev->lock);
1640
1641         if (idev->dead)
1642                 goto out;
1643
1644         if (__ipv6_regen_rndid(idev) < 0)
1645                 goto out;
1646
1647         expires = jiffies +
1648                 idev->cnf.temp_prefered_lft * HZ -
1649                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1650                 idev->cnf.max_desync_factor * HZ;
1651         if (time_before(expires, jiffies)) {
1652                 printk(KERN_WARNING
1653                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1654                         idev->dev->name);
1655                 goto out;
1656         }
1657
1658         if (!mod_timer(&idev->regen_timer, expires))
1659                 in6_dev_hold(idev);
1660
1661 out:
1662         write_unlock_bh(&idev->lock);
1663         rcu_read_unlock_bh();
1664         in6_dev_put(idev);
1665 }
1666
1667 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1668         int ret = 0;
1669
1670         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1671                 ret = __ipv6_regen_rndid(idev);
1672         return ret;
1673 }
1674 #endif
1675
1676 /*
1677  *      Add prefix route.
1678  */
1679
1680 static void
1681 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1682                       unsigned long expires, u32 flags)
1683 {
1684         struct fib6_config cfg = {
1685                 .fc_table = RT6_TABLE_PREFIX,
1686                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1687                 .fc_ifindex = dev->ifindex,
1688                 .fc_expires = expires,
1689                 .fc_dst_len = plen,
1690                 .fc_flags = RTF_UP | flags,
1691                 .fc_nlinfo.nl_net = dev_net(dev),
1692                 .fc_protocol = RTPROT_KERNEL,
1693         };
1694
1695         cfg.fc_dst = *pfx;
1696
1697         /* Prevent useless cloning on PtP SIT.
1698            This thing is done here expecting that the whole
1699            class of non-broadcast devices need not cloning.
1700          */
1701 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1702         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1703                 cfg.fc_flags |= RTF_NONEXTHOP;
1704 #endif
1705
1706         ip6_route_add(&cfg);
1707 }
1708
1709
1710 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1711                                                   int plen,
1712                                                   const struct net_device *dev,
1713                                                   u32 flags, u32 noflags)
1714 {
1715         struct fib6_node *fn;
1716         struct rt6_info *rt = NULL;
1717         struct fib6_table *table;
1718
1719         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1720         if (table == NULL)
1721                 return NULL;
1722
1723         write_lock_bh(&table->tb6_lock);
1724         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1725         if (!fn)
1726                 goto out;
1727         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1728                 if (rt->dst.dev->ifindex != dev->ifindex)
1729                         continue;
1730                 if ((rt->rt6i_flags & flags) != flags)
1731                         continue;
1732                 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1733                         continue;
1734                 dst_hold(&rt->dst);
1735                 break;
1736         }
1737 out:
1738         write_unlock_bh(&table->tb6_lock);
1739         return rt;
1740 }
1741
1742
1743 /* Create "default" multicast route to the interface */
1744
1745 static void addrconf_add_mroute(struct net_device *dev)
1746 {
1747         struct fib6_config cfg = {
1748                 .fc_table = RT6_TABLE_LOCAL,
1749                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1750                 .fc_ifindex = dev->ifindex,
1751                 .fc_dst_len = 8,
1752                 .fc_flags = RTF_UP,
1753                 .fc_nlinfo.nl_net = dev_net(dev),
1754         };
1755
1756         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1757
1758         ip6_route_add(&cfg);
1759 }
1760
1761 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1762 static void sit_route_add(struct net_device *dev)
1763 {
1764         struct fib6_config cfg = {
1765                 .fc_table = RT6_TABLE_MAIN,
1766                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1767                 .fc_ifindex = dev->ifindex,
1768                 .fc_dst_len = 96,
1769                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1770                 .fc_nlinfo.nl_net = dev_net(dev),
1771         };
1772
1773         /* prefix length - 96 bits "::d.d.d.d" */
1774         ip6_route_add(&cfg);
1775 }
1776 #endif
1777
1778 static void addrconf_add_lroute(struct net_device *dev)
1779 {
1780         struct in6_addr addr;
1781
1782         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1783         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1784 }
1785
1786 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1787 {
1788         struct inet6_dev *idev;
1789
1790         ASSERT_RTNL();
1791
1792         idev = ipv6_find_idev(dev);
1793         if (!idev)
1794                 return ERR_PTR(-ENOBUFS);
1795
1796         if (idev->cnf.disable_ipv6)
1797                 return ERR_PTR(-EACCES);
1798
1799         /* Add default multicast route */
1800         if (!(dev->flags & IFF_LOOPBACK))
1801                 addrconf_add_mroute(dev);
1802
1803         /* Add link local route */
1804         addrconf_add_lroute(dev);
1805         return idev;
1806 }
1807
1808 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1809 {
1810         struct prefix_info *pinfo;
1811         __u32 valid_lft;
1812         __u32 prefered_lft;
1813         int addr_type;
1814         struct inet6_dev *in6_dev;
1815         struct net *net = dev_net(dev);
1816
1817         pinfo = (struct prefix_info *) opt;
1818
1819         if (len < sizeof(struct prefix_info)) {
1820                 ADBG(("addrconf: prefix option too short\n"));
1821                 return;
1822         }
1823
1824         /*
1825          *      Validation checks ([ADDRCONF], page 19)
1826          */
1827
1828         addr_type = ipv6_addr_type(&pinfo->prefix);
1829
1830         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1831                 return;
1832
1833         valid_lft = ntohl(pinfo->valid);
1834         prefered_lft = ntohl(pinfo->prefered);
1835
1836         if (prefered_lft > valid_lft) {
1837                 if (net_ratelimit())
1838                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1839                 return;
1840         }
1841
1842         in6_dev = in6_dev_get(dev);
1843
1844         if (in6_dev == NULL) {
1845                 if (net_ratelimit())
1846                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1847                 return;
1848         }
1849
1850         /*
1851          *      Two things going on here:
1852          *      1) Add routes for on-link prefixes
1853          *      2) Configure prefixes with the auto flag set
1854          */
1855
1856         if (pinfo->onlink) {
1857                 struct rt6_info *rt;
1858                 unsigned long rt_expires;
1859
1860                 /* Avoid arithmetic overflow. Really, we could
1861                  * save rt_expires in seconds, likely valid_lft,
1862                  * but it would require division in fib gc, that it
1863                  * not good.
1864                  */
1865                 if (HZ > USER_HZ)
1866                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1867                 else
1868                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1869
1870                 if (addrconf_finite_timeout(rt_expires))
1871                         rt_expires *= HZ;
1872
1873                 rt = addrconf_get_prefix_route(&pinfo->prefix,
1874                                                pinfo->prefix_len,
1875                                                dev,
1876                                                RTF_ADDRCONF | RTF_PREFIX_RT,
1877                                                RTF_GATEWAY | RTF_DEFAULT);
1878
1879                 if (rt) {
1880                         /* Autoconf prefix route */
1881                         if (valid_lft == 0) {
1882                                 ip6_del_rt(rt);
1883                                 rt = NULL;
1884                         } else if (addrconf_finite_timeout(rt_expires)) {
1885                                 /* not infinity */
1886                                 rt->dst.expires = jiffies + rt_expires;
1887                                 rt->rt6i_flags |= RTF_EXPIRES;
1888                         } else {
1889                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1890                                 rt->dst.expires = 0;
1891                         }
1892                 } else if (valid_lft) {
1893                         clock_t expires = 0;
1894                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1895                         if (addrconf_finite_timeout(rt_expires)) {
1896                                 /* not infinity */
1897                                 flags |= RTF_EXPIRES;
1898                                 expires = jiffies_to_clock_t(rt_expires);
1899                         }
1900                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1901                                               dev, expires, flags);
1902                 }
1903                 if (rt)
1904                         dst_release(&rt->dst);
1905         }
1906
1907         /* Try to figure out our local address for this prefix */
1908
1909         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1910                 struct inet6_ifaddr * ifp;
1911                 struct in6_addr addr;
1912                 int create = 0, update_lft = 0;
1913
1914                 if (pinfo->prefix_len == 64) {
1915                         memcpy(&addr, &pinfo->prefix, 8);
1916                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1917                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1918                                 in6_dev_put(in6_dev);
1919                                 return;
1920                         }
1921                         goto ok;
1922                 }
1923                 if (net_ratelimit())
1924                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1925                                pinfo->prefix_len);
1926                 in6_dev_put(in6_dev);
1927                 return;
1928
1929 ok:
1930
1931                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1932
1933                 if (ifp == NULL && valid_lft) {
1934                         int max_addresses = in6_dev->cnf.max_addresses;
1935                         u32 addr_flags = 0;
1936
1937 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1938                         if (in6_dev->cnf.optimistic_dad &&
1939                             !net->ipv6.devconf_all->forwarding && sllao)
1940                                 addr_flags = IFA_F_OPTIMISTIC;
1941 #endif
1942
1943                         /* Do not allow to create too much of autoconfigured
1944                          * addresses; this would be too easy way to crash kernel.
1945                          */
1946                         if (!max_addresses ||
1947                             ipv6_count_addresses(in6_dev) < max_addresses)
1948                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1949                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1950                                                     addr_flags);
1951
1952                         if (!ifp || IS_ERR(ifp)) {
1953                                 in6_dev_put(in6_dev);
1954                                 return;
1955                         }
1956
1957                         update_lft = create = 1;
1958                         ifp->cstamp = jiffies;
1959                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1960                 }
1961
1962                 if (ifp) {
1963                         int flags;
1964                         unsigned long now;
1965 #ifdef CONFIG_IPV6_PRIVACY
1966                         struct inet6_ifaddr *ift;
1967 #endif
1968                         u32 stored_lft;
1969
1970                         /* update lifetime (RFC2462 5.5.3 e) */
1971                         spin_lock(&ifp->lock);
1972                         now = jiffies;
1973                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1974                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1975                         else
1976                                 stored_lft = 0;
1977                         if (!update_lft && stored_lft) {
1978                                 if (valid_lft > MIN_VALID_LIFETIME ||
1979                                     valid_lft > stored_lft)
1980                                         update_lft = 1;
1981                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1982                                         /* valid_lft <= stored_lft is always true */
1983                                         /*
1984                                          * RFC 4862 Section 5.5.3e:
1985                                          * "Note that the preferred lifetime of
1986                                          *  the corresponding address is always
1987                                          *  reset to the Preferred Lifetime in
1988                                          *  the received Prefix Information
1989                                          *  option, regardless of whether the
1990                                          *  valid lifetime is also reset or
1991                                          *  ignored."
1992                                          *
1993                                          *  So if the preferred lifetime in
1994                                          *  this advertisement is different
1995                                          *  than what we have stored, but the
1996                                          *  valid lifetime is invalid, just
1997                                          *  reset prefered_lft.
1998                                          *
1999                                          *  We must set the valid lifetime
2000                                          *  to the stored lifetime since we'll
2001                                          *  be updating the timestamp below,
2002                                          *  else we'll set it back to the
2003                                          *  minimum.
2004                                          */
2005                                         if (prefered_lft != ifp->prefered_lft) {
2006                                                 valid_lft = stored_lft;
2007                                                 update_lft = 1;
2008                                         }
2009                                 } else {
2010                                         valid_lft = MIN_VALID_LIFETIME;
2011                                         if (valid_lft < prefered_lft)
2012                                                 prefered_lft = valid_lft;
2013                                         update_lft = 1;
2014                                 }
2015                         }
2016
2017                         if (update_lft) {
2018                                 ifp->valid_lft = valid_lft;
2019                                 ifp->prefered_lft = prefered_lft;
2020                                 ifp->tstamp = now;
2021                                 flags = ifp->flags;
2022                                 ifp->flags &= ~IFA_F_DEPRECATED;
2023                                 spin_unlock(&ifp->lock);
2024
2025                                 if (!(flags&IFA_F_TENTATIVE))
2026                                         ipv6_ifa_notify(0, ifp);
2027                         } else
2028                                 spin_unlock(&ifp->lock);
2029
2030 #ifdef CONFIG_IPV6_PRIVACY
2031                         read_lock_bh(&in6_dev->lock);
2032                         /* update all temporary addresses in the list */
2033                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2034                                             tmp_list) {
2035                                 int age, max_valid, max_prefered;
2036
2037                                 if (ifp != ift->ifpub)
2038                                         continue;
2039
2040                                 /*
2041                                  * RFC 4941 section 3.3:
2042                                  * If a received option will extend the lifetime
2043                                  * of a public address, the lifetimes of
2044                                  * temporary addresses should be extended,
2045                                  * subject to the overall constraint that no
2046                                  * temporary addresses should ever remain
2047                                  * "valid" or "preferred" for a time longer than
2048                                  * (TEMP_VALID_LIFETIME) or
2049                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2050                                  * respectively.
2051                                  */
2052                                 age = (now - ift->cstamp) / HZ;
2053                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2054                                 if (max_valid < 0)
2055                                         max_valid = 0;
2056
2057                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2058                                                in6_dev->cnf.max_desync_factor -
2059                                                age;
2060                                 if (max_prefered < 0)
2061                                         max_prefered = 0;
2062
2063                                 if (valid_lft > max_valid)
2064                                         valid_lft = max_valid;
2065
2066                                 if (prefered_lft > max_prefered)
2067                                         prefered_lft = max_prefered;
2068
2069                                 spin_lock(&ift->lock);
2070                                 flags = ift->flags;
2071                                 ift->valid_lft = valid_lft;
2072                                 ift->prefered_lft = prefered_lft;
2073                                 ift->tstamp = now;
2074                                 if (prefered_lft > 0)
2075                                         ift->flags &= ~IFA_F_DEPRECATED;
2076
2077                                 spin_unlock(&ift->lock);
2078                                 if (!(flags&IFA_F_TENTATIVE))
2079                                         ipv6_ifa_notify(0, ift);
2080                         }
2081
2082                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2083                                 /*
2084                                  * When a new public address is created as
2085                                  * described in [ADDRCONF], also create a new
2086                                  * temporary address. Also create a temporary
2087                                  * address if it's enabled but no temporary
2088                                  * address currently exists.
2089                                  */
2090                                 read_unlock_bh(&in6_dev->lock);
2091                                 ipv6_create_tempaddr(ifp, NULL);
2092                         } else {
2093                                 read_unlock_bh(&in6_dev->lock);
2094                         }
2095 #endif
2096                         in6_ifa_put(ifp);
2097                         addrconf_verify(0);
2098                 }
2099         }
2100         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2101         in6_dev_put(in6_dev);
2102 }
2103
2104 /*
2105  *      Set destination address.
2106  *      Special case for SIT interfaces where we create a new "virtual"
2107  *      device.
2108  */
2109 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2110 {
2111         struct in6_ifreq ireq;
2112         struct net_device *dev;
2113         int err = -EINVAL;
2114
2115         rtnl_lock();
2116
2117         err = -EFAULT;
2118         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2119                 goto err_exit;
2120
2121         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2122
2123         err = -ENODEV;
2124         if (dev == NULL)
2125                 goto err_exit;
2126
2127 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2128         if (dev->type == ARPHRD_SIT) {
2129                 const struct net_device_ops *ops = dev->netdev_ops;
2130                 struct ifreq ifr;
2131                 struct ip_tunnel_parm p;
2132
2133                 err = -EADDRNOTAVAIL;
2134                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2135                         goto err_exit;
2136
2137                 memset(&p, 0, sizeof(p));
2138                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2139                 p.iph.saddr = 0;
2140                 p.iph.version = 4;
2141                 p.iph.ihl = 5;
2142                 p.iph.protocol = IPPROTO_IPV6;
2143                 p.iph.ttl = 64;
2144                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2145
2146                 if (ops->ndo_do_ioctl) {
2147                         mm_segment_t oldfs = get_fs();
2148
2149                         set_fs(KERNEL_DS);
2150                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2151                         set_fs(oldfs);
2152                 } else
2153                         err = -EOPNOTSUPP;
2154
2155                 if (err == 0) {
2156                         err = -ENOBUFS;
2157                         dev = __dev_get_by_name(net, p.name);
2158                         if (!dev)
2159                                 goto err_exit;
2160                         err = dev_open(dev);
2161                 }
2162         }
2163 #endif
2164
2165 err_exit:
2166         rtnl_unlock();
2167         return err;
2168 }
2169
2170 /*
2171  *      Manual configuration of address on an interface
2172  */
2173 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2174                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2175                           __u32 valid_lft)
2176 {
2177         struct inet6_ifaddr *ifp;
2178         struct inet6_dev *idev;
2179         struct net_device *dev;
2180         int scope;
2181         u32 flags;
2182         clock_t expires;
2183         unsigned long timeout;
2184
2185         ASSERT_RTNL();
2186
2187         if (plen > 128)
2188                 return -EINVAL;
2189
2190         /* check the lifetime */
2191         if (!valid_lft || prefered_lft > valid_lft)
2192                 return -EINVAL;
2193
2194         dev = __dev_get_by_index(net, ifindex);
2195         if (!dev)
2196                 return -ENODEV;
2197
2198         idev = addrconf_add_dev(dev);
2199         if (IS_ERR(idev))
2200                 return PTR_ERR(idev);
2201
2202         scope = ipv6_addr_scope(pfx);
2203
2204         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2205         if (addrconf_finite_timeout(timeout)) {
2206                 expires = jiffies_to_clock_t(timeout * HZ);
2207                 valid_lft = timeout;
2208                 flags = RTF_EXPIRES;
2209         } else {
2210                 expires = 0;
2211                 flags = 0;
2212                 ifa_flags |= IFA_F_PERMANENT;
2213         }
2214
2215         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2216         if (addrconf_finite_timeout(timeout)) {
2217                 if (timeout == 0)
2218                         ifa_flags |= IFA_F_DEPRECATED;
2219                 prefered_lft = timeout;
2220         }
2221
2222         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2223
2224         if (!IS_ERR(ifp)) {
2225                 spin_lock_bh(&ifp->lock);
2226                 ifp->valid_lft = valid_lft;
2227                 ifp->prefered_lft = prefered_lft;
2228                 ifp->tstamp = jiffies;
2229                 spin_unlock_bh(&ifp->lock);
2230
2231                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2232                                       expires, flags);
2233                 /*
2234                  * Note that section 3.1 of RFC 4429 indicates
2235                  * that the Optimistic flag should not be set for
2236                  * manually configured addresses
2237                  */
2238                 addrconf_dad_start(ifp, 0);
2239                 in6_ifa_put(ifp);
2240                 addrconf_verify(0);
2241                 return 0;
2242         }
2243
2244         return PTR_ERR(ifp);
2245 }
2246
2247 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2248                           unsigned int plen)
2249 {
2250         struct inet6_ifaddr *ifp;
2251         struct inet6_dev *idev;
2252         struct net_device *dev;
2253
2254         if (plen > 128)
2255                 return -EINVAL;
2256
2257         dev = __dev_get_by_index(net, ifindex);
2258         if (!dev)
2259                 return -ENODEV;
2260
2261         if ((idev = __in6_dev_get(dev)) == NULL)
2262                 return -ENXIO;
2263
2264         read_lock_bh(&idev->lock);
2265         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2266                 if (ifp->prefix_len == plen &&
2267                     ipv6_addr_equal(pfx, &ifp->addr)) {
2268                         in6_ifa_hold(ifp);
2269                         read_unlock_bh(&idev->lock);
2270
2271                         ipv6_del_addr(ifp);
2272
2273                         /* If the last address is deleted administratively,
2274                            disable IPv6 on this interface.
2275                          */
2276                         if (list_empty(&idev->addr_list))
2277                                 addrconf_ifdown(idev->dev, 1);
2278                         return 0;
2279                 }
2280         }
2281         read_unlock_bh(&idev->lock);
2282         return -EADDRNOTAVAIL;
2283 }
2284
2285
2286 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2287 {
2288         struct in6_ifreq ireq;
2289         int err;
2290
2291         if (!capable(CAP_NET_ADMIN))
2292                 return -EPERM;
2293
2294         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2295                 return -EFAULT;
2296
2297         rtnl_lock();
2298         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2299                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2300                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2301         rtnl_unlock();
2302         return err;
2303 }
2304
2305 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2306 {
2307         struct in6_ifreq ireq;
2308         int err;
2309
2310         if (!capable(CAP_NET_ADMIN))
2311                 return -EPERM;
2312
2313         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2314                 return -EFAULT;
2315
2316         rtnl_lock();
2317         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2318                              ireq.ifr6_prefixlen);
2319         rtnl_unlock();
2320         return err;
2321 }
2322
2323 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2324                      int plen, int scope)
2325 {
2326         struct inet6_ifaddr *ifp;
2327
2328         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2329         if (!IS_ERR(ifp)) {
2330                 spin_lock_bh(&ifp->lock);
2331                 ifp->flags &= ~IFA_F_TENTATIVE;
2332                 spin_unlock_bh(&ifp->lock);
2333                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2334                 in6_ifa_put(ifp);
2335         }
2336 }
2337
2338 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2339 static void sit_add_v4_addrs(struct inet6_dev *idev)
2340 {
2341         struct in6_addr addr;
2342         struct net_device *dev;
2343         struct net *net = dev_net(idev->dev);
2344         int scope;
2345
2346         ASSERT_RTNL();
2347
2348         memset(&addr, 0, sizeof(struct in6_addr));
2349         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2350
2351         if (idev->dev->flags&IFF_POINTOPOINT) {
2352                 addr.s6_addr32[0] = htonl(0xfe800000);
2353                 scope = IFA_LINK;
2354         } else {
2355                 scope = IPV6_ADDR_COMPATv4;
2356         }
2357
2358         if (addr.s6_addr32[3]) {
2359                 add_addr(idev, &addr, 128, scope);
2360                 return;
2361         }
2362
2363         for_each_netdev(net, dev) {
2364                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2365                 if (in_dev && (dev->flags & IFF_UP)) {
2366                         struct in_ifaddr * ifa;
2367
2368                         int flag = scope;
2369
2370                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2371                                 int plen;
2372
2373                                 addr.s6_addr32[3] = ifa->ifa_local;
2374
2375                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2376                                         continue;
2377                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2378                                         if (idev->dev->flags&IFF_POINTOPOINT)
2379                                                 continue;
2380                                         flag |= IFA_HOST;
2381                                 }
2382                                 if (idev->dev->flags&IFF_POINTOPOINT)
2383                                         plen = 64;
2384                                 else
2385                                         plen = 96;
2386
2387                                 add_addr(idev, &addr, plen, flag);
2388                         }
2389                 }
2390         }
2391 }
2392 #endif
2393
2394 static void init_loopback(struct net_device *dev)
2395 {
2396         struct inet6_dev  *idev;
2397
2398         /* ::1 */
2399
2400         ASSERT_RTNL();
2401
2402         if ((idev = ipv6_find_idev(dev)) == NULL) {
2403                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2404                 return;
2405         }
2406
2407         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2408 }
2409
2410 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2411 {
2412         struct inet6_ifaddr * ifp;
2413         u32 addr_flags = IFA_F_PERMANENT;
2414
2415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2416         if (idev->cnf.optimistic_dad &&
2417             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2418                 addr_flags |= IFA_F_OPTIMISTIC;
2419 #endif
2420
2421
2422         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2423         if (!IS_ERR(ifp)) {
2424                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2425                 addrconf_dad_start(ifp, 0);
2426                 in6_ifa_put(ifp);
2427         }
2428 }
2429
2430 static void addrconf_dev_config(struct net_device *dev)
2431 {
2432         struct in6_addr addr;
2433         struct inet6_dev    * idev;
2434
2435         ASSERT_RTNL();
2436
2437         if ((dev->type != ARPHRD_ETHER) &&
2438             (dev->type != ARPHRD_FDDI) &&
2439             (dev->type != ARPHRD_IEEE802_TR) &&
2440             (dev->type != ARPHRD_ARCNET) &&
2441             (dev->type != ARPHRD_INFINIBAND)) {
2442                 /* Alas, we support only Ethernet autoconfiguration. */
2443                 return;
2444         }
2445
2446         idev = addrconf_add_dev(dev);
2447         if (IS_ERR(idev))
2448                 return;
2449
2450         memset(&addr, 0, sizeof(struct in6_addr));
2451         addr.s6_addr32[0] = htonl(0xFE800000);
2452
2453         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2454                 addrconf_add_linklocal(idev, &addr);
2455 }
2456
2457 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2458 static void addrconf_sit_config(struct net_device *dev)
2459 {
2460         struct inet6_dev *idev;
2461
2462         ASSERT_RTNL();
2463
2464         /*
2465          * Configure the tunnel with one of our IPv4
2466          * addresses... we should configure all of
2467          * our v4 addrs in the tunnel
2468          */
2469
2470         if ((idev = ipv6_find_idev(dev)) == NULL) {
2471                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2472                 return;
2473         }
2474
2475         if (dev->priv_flags & IFF_ISATAP) {
2476                 struct in6_addr addr;
2477
2478                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2479                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2480                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2481                         addrconf_add_linklocal(idev, &addr);
2482                 return;
2483         }
2484
2485         sit_add_v4_addrs(idev);
2486
2487         if (dev->flags&IFF_POINTOPOINT) {
2488                 addrconf_add_mroute(dev);
2489                 addrconf_add_lroute(dev);
2490         } else
2491                 sit_route_add(dev);
2492 }
2493 #endif
2494
2495 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2496 static void addrconf_gre_config(struct net_device *dev)
2497 {
2498         struct inet6_dev *idev;
2499         struct in6_addr addr;
2500
2501         pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2502
2503         ASSERT_RTNL();
2504
2505         if ((idev = ipv6_find_idev(dev)) == NULL) {
2506                 printk(KERN_DEBUG "init gre: add_dev failed\n");
2507                 return;
2508         }
2509
2510         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2511         addrconf_prefix_route(&addr, 64, dev, 0, 0);
2512
2513         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2514                 addrconf_add_linklocal(idev, &addr);
2515 }
2516 #endif
2517
2518 static inline int
2519 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2520 {
2521         struct in6_addr lladdr;
2522
2523         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2524                 addrconf_add_linklocal(idev, &lladdr);
2525                 return 0;
2526         }
2527         return -1;
2528 }
2529
2530 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2531 {
2532         struct net_device *link_dev;
2533         struct net *net = dev_net(idev->dev);
2534
2535         /* first try to inherit the link-local address from the link device */
2536         if (idev->dev->iflink &&
2537             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2538                 if (!ipv6_inherit_linklocal(idev, link_dev))
2539                         return;
2540         }
2541         /* then try to inherit it from any device */
2542         for_each_netdev(net, link_dev) {
2543                 if (!ipv6_inherit_linklocal(idev, link_dev))
2544                         return;
2545         }
2546         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2547 }
2548
2549 /*
2550  * Autoconfigure tunnel with a link-local address so routing protocols,
2551  * DHCPv6, MLD etc. can be run over the virtual link
2552  */
2553
2554 static void addrconf_ip6_tnl_config(struct net_device *dev)
2555 {
2556         struct inet6_dev *idev;
2557
2558         ASSERT_RTNL();
2559
2560         idev = addrconf_add_dev(dev);
2561         if (IS_ERR(idev)) {
2562                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2563                 return;
2564         }
2565         ip6_tnl_add_linklocal(idev);
2566 }
2567
2568 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2569                            void * data)
2570 {
2571         struct net_device *dev = (struct net_device *) data;
2572         struct inet6_dev *idev = __in6_dev_get(dev);
2573         int run_pending = 0;
2574         int err;
2575
2576         switch (event) {
2577         case NETDEV_REGISTER:
2578                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2579                         idev = ipv6_add_dev(dev);
2580                         if (!idev)
2581                                 return notifier_from_errno(-ENOMEM);
2582                 }
2583                 break;
2584
2585         case NETDEV_UP:
2586         case NETDEV_CHANGE:
2587                 if (dev->flags & IFF_SLAVE)
2588                         break;
2589
2590                 if (event == NETDEV_UP) {
2591                         if (!addrconf_qdisc_ok(dev)) {
2592                                 /* device is not ready yet. */
2593                                 printk(KERN_INFO
2594                                         "ADDRCONF(NETDEV_UP): %s: "
2595                                         "link is not ready\n",
2596                                         dev->name);
2597                                 break;
2598                         }
2599
2600                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2601                                 idev = ipv6_add_dev(dev);
2602
2603                         if (idev) {
2604                                 idev->if_flags |= IF_READY;
2605                                 run_pending = 1;
2606                         }
2607                 } else {
2608                         if (!addrconf_qdisc_ok(dev)) {
2609                                 /* device is still not ready. */
2610                                 break;
2611                         }
2612
2613                         if (idev) {
2614                                 if (idev->if_flags & IF_READY)
2615                                         /* device is already configured. */
2616                                         break;
2617                                 idev->if_flags |= IF_READY;
2618                         }
2619
2620                         printk(KERN_INFO
2621                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2622                                         "link becomes ready\n",
2623                                         dev->name);
2624
2625                         run_pending = 1;
2626                 }
2627
2628                 switch (dev->type) {
2629 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2630                 case ARPHRD_SIT:
2631                         addrconf_sit_config(dev);
2632                         break;
2633 #endif
2634 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2635                 case ARPHRD_IPGRE:
2636                         addrconf_gre_config(dev);
2637                         break;
2638 #endif
2639                 case ARPHRD_TUNNEL6:
2640                         addrconf_ip6_tnl_config(dev);
2641                         break;
2642                 case ARPHRD_LOOPBACK:
2643                         init_loopback(dev);
2644                         break;
2645
2646                 default:
2647                         addrconf_dev_config(dev);
2648                         break;
2649                 }
2650
2651                 if (idev) {
2652                         if (run_pending)
2653                                 addrconf_dad_run(idev);
2654
2655                         /*
2656                          * If the MTU changed during the interface down,
2657                          * when the interface up, the changed MTU must be
2658                          * reflected in the idev as well as routers.
2659                          */
2660                         if (idev->cnf.mtu6 != dev->mtu &&
2661                             dev->mtu >= IPV6_MIN_MTU) {
2662                                 rt6_mtu_change(dev, dev->mtu);
2663                                 idev->cnf.mtu6 = dev->mtu;
2664                         }
2665                         idev->tstamp = jiffies;
2666                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2667
2668                         /*
2669                          * If the changed mtu during down is lower than
2670                          * IPV6_MIN_MTU stop IPv6 on this interface.
2671                          */
2672                         if (dev->mtu < IPV6_MIN_MTU)
2673                                 addrconf_ifdown(dev, 1);
2674                 }
2675                 break;
2676
2677         case NETDEV_CHANGEMTU:
2678                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2679                         rt6_mtu_change(dev, dev->mtu);
2680                         idev->cnf.mtu6 = dev->mtu;
2681                         break;
2682                 }
2683
2684                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2685                         idev = ipv6_add_dev(dev);
2686                         if (idev)
2687                                 break;
2688                 }
2689
2690                 /*
2691                  * MTU falled under IPV6_MIN_MTU.
2692                  * Stop IPv6 on this interface.
2693                  */
2694
2695         case NETDEV_DOWN:
2696         case NETDEV_UNREGISTER:
2697                 /*
2698                  *      Remove all addresses from this interface.
2699                  */
2700                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2701                 break;
2702
2703         case NETDEV_CHANGENAME:
2704                 if (idev) {
2705                         snmp6_unregister_dev(idev);
2706                         addrconf_sysctl_unregister(idev);
2707                         addrconf_sysctl_register(idev);
2708                         err = snmp6_register_dev(idev);
2709                         if (err)
2710                                 return notifier_from_errno(err);
2711                 }
2712                 break;
2713
2714         case NETDEV_PRE_TYPE_CHANGE:
2715         case NETDEV_POST_TYPE_CHANGE:
2716                 addrconf_type_change(dev, event);
2717                 break;
2718         }
2719
2720         return NOTIFY_OK;
2721 }
2722
2723 /*
2724  *      addrconf module should be notified of a device going up
2725  */
2726 static struct notifier_block ipv6_dev_notf = {
2727         .notifier_call = addrconf_notify,
2728 };
2729
2730 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2731 {
2732         struct inet6_dev *idev;
2733         ASSERT_RTNL();
2734
2735         idev = __in6_dev_get(dev);
2736
2737         if (event == NETDEV_POST_TYPE_CHANGE)
2738                 ipv6_mc_remap(idev);
2739         else if (event == NETDEV_PRE_TYPE_CHANGE)
2740                 ipv6_mc_unmap(idev);
2741 }
2742
2743 static int addrconf_ifdown(struct net_device *dev, int how)
2744 {
2745         struct net *net = dev_net(dev);
2746         struct inet6_dev *idev;
2747         struct inet6_ifaddr *ifa;
2748         int state, i;
2749
2750         ASSERT_RTNL();
2751
2752         rt6_ifdown(net, dev);
2753         neigh_ifdown(&nd_tbl, dev);
2754
2755         idev = __in6_dev_get(dev);
2756         if (idev == NULL)
2757                 return -ENODEV;
2758
2759         /*
2760          * Step 1: remove reference to ipv6 device from parent device.
2761          *         Do not dev_put!
2762          */
2763         if (how) {
2764                 idev->dead = 1;
2765
2766                 /* protected by rtnl_lock */
2767                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2768
2769                 /* Step 1.5: remove snmp6 entry */
2770                 snmp6_unregister_dev(idev);
2771
2772         }
2773
2774         /* Step 2: clear hash table */
2775         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2776                 struct hlist_head *h = &inet6_addr_lst[i];
2777                 struct hlist_node *n;
2778
2779                 spin_lock_bh(&addrconf_hash_lock);
2780         restart:
2781                 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2782                         if (ifa->idev == idev) {
2783                                 hlist_del_init_rcu(&ifa->addr_lst);
2784                                 addrconf_del_timer(ifa);
2785                                 goto restart;
2786                         }
2787                 }
2788                 spin_unlock_bh(&addrconf_hash_lock);
2789         }
2790
2791         write_lock_bh(&idev->lock);
2792
2793         /* Step 2: clear flags for stateless addrconf */
2794         if (!how)
2795                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2796
2797 #ifdef CONFIG_IPV6_PRIVACY
2798         if (how && del_timer(&idev->regen_timer))
2799                 in6_dev_put(idev);
2800
2801         /* Step 3: clear tempaddr list */
2802         while (!list_empty(&idev->tempaddr_list)) {
2803                 ifa = list_first_entry(&idev->tempaddr_list,
2804                                        struct inet6_ifaddr, tmp_list);
2805                 list_del(&ifa->tmp_list);
2806                 write_unlock_bh(&idev->lock);
2807                 spin_lock_bh(&ifa->lock);
2808
2809                 if (ifa->ifpub) {
2810                         in6_ifa_put(ifa->ifpub);
2811                         ifa->ifpub = NULL;
2812                 }
2813                 spin_unlock_bh(&ifa->lock);
2814                 in6_ifa_put(ifa);
2815                 write_lock_bh(&idev->lock);
2816         }
2817 #endif
2818
2819         while (!list_empty(&idev->addr_list)) {
2820                 ifa = list_first_entry(&idev->addr_list,
2821                                        struct inet6_ifaddr, if_list);
2822                 addrconf_del_timer(ifa);
2823
2824                 list_del(&ifa->if_list);
2825
2826                 write_unlock_bh(&idev->lock);
2827
2828                 spin_lock_bh(&ifa->state_lock);
2829                 state = ifa->state;
2830                 ifa->state = INET6_IFADDR_STATE_DEAD;
2831                 spin_unlock_bh(&ifa->state_lock);
2832
2833                 if (state != INET6_IFADDR_STATE_DEAD) {
2834                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
2835                         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2836                 }
2837                 in6_ifa_put(ifa);
2838
2839                 write_lock_bh(&idev->lock);
2840         }
2841
2842         write_unlock_bh(&idev->lock);
2843
2844         /* Step 5: Discard multicast list */
2845         if (how)
2846                 ipv6_mc_destroy_dev(idev);
2847         else
2848                 ipv6_mc_down(idev);
2849
2850         idev->tstamp = jiffies;
2851
2852         /* Last: Shot the device (if unregistered) */
2853         if (how) {
2854                 addrconf_sysctl_unregister(idev);
2855                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2856                 neigh_ifdown(&nd_tbl, dev);
2857                 in6_dev_put(idev);
2858         }
2859         return 0;
2860 }
2861
2862 static void addrconf_rs_timer(unsigned long data)
2863 {
2864         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2865         struct inet6_dev *idev = ifp->idev;
2866
2867         read_lock(&idev->lock);
2868         if (idev->dead || !(idev->if_flags & IF_READY))
2869                 goto out;
2870
2871         if (idev->cnf.forwarding)
2872                 goto out;
2873
2874         /* Announcement received after solicitation was sent */
2875         if (idev->if_flags & IF_RA_RCVD)
2876                 goto out;
2877
2878         spin_lock(&ifp->lock);
2879         if (ifp->probes++ < idev->cnf.rtr_solicits) {
2880                 /* The wait after the last probe can be shorter */
2881                 addrconf_mod_timer(ifp, AC_RS,
2882                                    (ifp->probes == idev->cnf.rtr_solicits) ?
2883                                    idev->cnf.rtr_solicit_delay :
2884                                    idev->cnf.rtr_solicit_interval);
2885                 spin_unlock(&ifp->lock);
2886
2887                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2888         } else {
2889                 spin_unlock(&ifp->lock);
2890                 /*
2891                  * Note: we do not support deprecated "all on-link"
2892                  * assumption any longer.
2893                  */
2894                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2895                        idev->dev->name);
2896         }
2897
2898 out:
2899         read_unlock(&idev->lock);
2900         in6_ifa_put(ifp);
2901 }
2902
2903 /*
2904  *      Duplicate Address Detection
2905  */
2906 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2907 {
2908         unsigned long rand_num;
2909         struct inet6_dev *idev = ifp->idev;
2910
2911         if (ifp->flags & IFA_F_OPTIMISTIC)
2912                 rand_num = 0;
2913         else
2914                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2915
2916         ifp->probes = idev->cnf.dad_transmits;
2917         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2918 }
2919
2920 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2921 {
2922         struct inet6_dev *idev = ifp->idev;
2923         struct net_device *dev = idev->dev;
2924
2925         addrconf_join_solict(dev, &ifp->addr);
2926
2927         net_srandom(ifp->addr.s6_addr32[3]);
2928
2929         read_lock_bh(&idev->lock);
2930         spin_lock(&ifp->lock);
2931         if (ifp->state == INET6_IFADDR_STATE_DEAD)
2932                 goto out;
2933
2934         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2935             idev->cnf.accept_dad < 1 ||
2936             !(ifp->flags&IFA_F_TENTATIVE) ||
2937             ifp->flags & IFA_F_NODAD) {
2938                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2939                 spin_unlock(&ifp->lock);
2940                 read_unlock_bh(&idev->lock);
2941
2942                 addrconf_dad_completed(ifp);
2943                 return;
2944         }
2945
2946         if (!(idev->if_flags & IF_READY)) {
2947                 spin_unlock(&ifp->lock);
2948                 read_unlock_bh(&idev->lock);
2949                 /*
2950                  * If the device is not ready:
2951                  * - keep it tentative if it is a permanent address.
2952                  * - otherwise, kill it.
2953                  */
2954                 in6_ifa_hold(ifp);
2955                 addrconf_dad_stop(ifp, 0);
2956                 return;
2957         }
2958
2959         /*
2960          * Optimistic nodes can start receiving
2961          * Frames right away
2962          */
2963         if (ifp->flags & IFA_F_OPTIMISTIC)
2964                 ip6_ins_rt(ifp->rt);
2965
2966         addrconf_dad_kick(ifp);
2967 out:
2968         spin_unlock(&ifp->lock);
2969         read_unlock_bh(&idev->lock);
2970 }
2971
2972 static void addrconf_dad_timer(unsigned long data)
2973 {
2974         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2975         struct inet6_dev *idev = ifp->idev;
2976         struct in6_addr mcaddr;
2977
2978         if (!ifp->probes && addrconf_dad_end(ifp))
2979                 goto out;
2980
2981         read_lock(&idev->lock);
2982         if (idev->dead || !(idev->if_flags & IF_READY)) {
2983                 read_unlock(&idev->lock);
2984                 goto out;
2985         }
2986
2987         spin_lock(&ifp->lock);
2988         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2989                 spin_unlock(&ifp->lock);
2990                 read_unlock(&idev->lock);
2991                 goto out;
2992         }
2993
2994         if (ifp->probes == 0) {
2995                 /*
2996                  * DAD was successful
2997                  */
2998
2999                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3000                 spin_unlock(&ifp->lock);
3001                 read_unlock(&idev->lock);
3002
3003                 addrconf_dad_completed(ifp);
3004
3005                 goto out;
3006         }
3007
3008         ifp->probes--;
3009         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3010         spin_unlock(&ifp->lock);
3011         read_unlock(&idev->lock);
3012
3013         /* send a neighbour solicitation for our addr */
3014         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3015         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3016 out:
3017         in6_ifa_put(ifp);
3018 }
3019
3020 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3021 {
3022         struct net_device *dev = ifp->idev->dev;
3023
3024         /*
3025          *      Configure the address for reception. Now it is valid.
3026          */
3027
3028         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3029
3030         /* If added prefix is link local and we are prepared to process
3031            router advertisements, start sending router solicitations.
3032          */
3033
3034         if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3035              ifp->idev->cnf.accept_ra == 2) &&
3036             ifp->idev->cnf.rtr_solicits > 0 &&
3037             (dev->flags&IFF_LOOPBACK) == 0 &&
3038             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3039                 /*
3040                  *      If a host as already performed a random delay
3041                  *      [...] as part of DAD [...] there is no need
3042                  *      to delay again before sending the first RS
3043                  */
3044                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3045
3046                 spin_lock_bh(&ifp->lock);
3047                 ifp->probes = 1;
3048                 ifp->idev->if_flags |= IF_RS_SENT;
3049                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3050                 spin_unlock_bh(&ifp->lock);
3051         }
3052 }
3053
3054 static void addrconf_dad_run(struct inet6_dev *idev)
3055 {
3056         struct inet6_ifaddr *ifp;
3057
3058         read_lock_bh(&idev->lock);
3059         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3060                 spin_lock(&ifp->lock);
3061                 if (ifp->flags & IFA_F_TENTATIVE &&
3062                     ifp->state == INET6_IFADDR_STATE_DAD)
3063                         addrconf_dad_kick(ifp);
3064                 spin_unlock(&ifp->lock);
3065         }
3066         read_unlock_bh(&idev->lock);
3067 }
3068
3069 #ifdef CONFIG_PROC_FS
3070 struct if6_iter_state {
3071         struct seq_net_private p;
3072         int bucket;
3073         int offset;
3074 };
3075
3076 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3077 {
3078         struct inet6_ifaddr *ifa = NULL;
3079         struct if6_iter_state *state = seq->private;
3080         struct net *net = seq_file_net(seq);
3081         int p = 0;
3082
3083         /* initial bucket if pos is 0 */
3084         if (pos == 0) {
3085                 state->bucket = 0;
3086                 state->offset = 0;
3087         }
3088
3089         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3090                 struct hlist_node *n;
3091                 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3092                                          addr_lst) {
3093                         /* sync with offset */
3094                         if (p < state->offset) {
3095                                 p++;
3096                                 continue;
3097                         }
3098                         state->offset++;
3099                         if (net_eq(dev_net(ifa->idev->dev), net))
3100                                 return ifa;
3101                 }
3102
3103                 /* prepare for next bucket */
3104                 state->offset = 0;
3105                 p = 0;
3106         }
3107         return NULL;
3108 }
3109
3110 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3111                                          struct inet6_ifaddr *ifa)
3112 {
3113         struct if6_iter_state *state = seq->private;
3114         struct net *net = seq_file_net(seq);
3115         struct hlist_node *n = &ifa->addr_lst;
3116
3117         hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3118                 state->offset++;
3119                 if (net_eq(dev_net(ifa->idev->dev), net))
3120                         return ifa;
3121         }
3122
3123         while (++state->bucket < IN6_ADDR_HSIZE) {
3124                 state->offset = 0;
3125                 hlist_for_each_entry_rcu_bh(ifa, n,
3126                                      &inet6_addr_lst[state->bucket], addr_lst) {
3127                         state->offset++;
3128                         if (net_eq(dev_net(ifa->idev->dev), net))
3129                                 return ifa;
3130                 }
3131         }
3132
3133         return NULL;
3134 }
3135
3136 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3137         __acquires(rcu_bh)
3138 {
3139         rcu_read_lock_bh();
3140         return if6_get_first(seq, *pos);
3141 }
3142
3143 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3144 {
3145         struct inet6_ifaddr *ifa;
3146
3147         ifa = if6_get_next(seq, v);
3148         ++*pos;
3149         return ifa;
3150 }
3151
3152 static void if6_seq_stop(struct seq_file *seq, void *v)
3153         __releases(rcu_bh)
3154 {
3155         rcu_read_unlock_bh();
3156 }
3157
3158 static int if6_seq_show(struct seq_file *seq, void *v)
3159 {
3160         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3161         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3162                    &ifp->addr,
3163                    ifp->idev->dev->ifindex,
3164                    ifp->prefix_len,
3165                    ifp->scope,
3166                    ifp->flags,
3167                    ifp->idev->dev->name);
3168         return 0;
3169 }
3170
3171 static const struct seq_operations if6_seq_ops = {
3172         .start  = if6_seq_start,
3173         .next   = if6_seq_next,
3174         .show   = if6_seq_show,
3175         .stop   = if6_seq_stop,
3176 };
3177
3178 static int if6_seq_open(struct inode *inode, struct file *file)
3179 {
3180         return seq_open_net(inode, file, &if6_seq_ops,
3181                             sizeof(struct if6_iter_state));
3182 }
3183
3184 static const struct file_operations if6_fops = {
3185         .owner          = THIS_MODULE,
3186         .open           = if6_seq_open,
3187         .read           = seq_read,
3188         .llseek         = seq_lseek,
3189         .release        = seq_release_net,
3190 };
3191
3192 static int __net_init if6_proc_net_init(struct net *net)
3193 {
3194         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3195                 return -ENOMEM;
3196         return 0;
3197 }
3198
3199 static void __net_exit if6_proc_net_exit(struct net *net)
3200 {
3201        proc_net_remove(net, "if_inet6");
3202 }
3203
3204 static struct pernet_operations if6_proc_net_ops = {
3205        .init = if6_proc_net_init,
3206        .exit = if6_proc_net_exit,
3207 };
3208
3209 int __init if6_proc_init(void)
3210 {
3211         return register_pernet_subsys(&if6_proc_net_ops);
3212 }
3213
3214 void if6_proc_exit(void)
3215 {
3216         unregister_pernet_subsys(&if6_proc_net_ops);
3217 }
3218 #endif  /* CONFIG_PROC_FS */
3219
3220 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3221 /* Check if address is a home address configured on any interface. */
3222 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3223 {
3224         int ret = 0;
3225         struct inet6_ifaddr *ifp = NULL;
3226         struct hlist_node *n;
3227         unsigned int hash = ipv6_addr_hash(addr);
3228
3229         rcu_read_lock_bh();
3230         hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3231                 if (!net_eq(dev_net(ifp->idev->dev), net))
3232                         continue;
3233                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3234                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3235                         ret = 1;
3236                         break;
3237                 }
3238         }
3239         rcu_read_unlock_bh();
3240         return ret;
3241 }
3242 #endif
3243
3244 /*
3245  *      Periodic address status verification
3246  */
3247
3248 static void addrconf_verify(unsigned long foo)
3249 {
3250         unsigned long now, next, next_sec, next_sched;
3251         struct inet6_ifaddr *ifp;
3252         struct hlist_node *node;
3253         int i;
3254
3255         rcu_read_lock_bh();
3256         spin_lock(&addrconf_verify_lock);
3257         now = jiffies;
3258         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3259
3260         del_timer(&addr_chk_timer);
3261
3262         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3263 restart:
3264                 hlist_for_each_entry_rcu_bh(ifp, node,
3265                                          &inet6_addr_lst[i], addr_lst) {
3266                         unsigned long age;
3267
3268                         if (ifp->flags & IFA_F_PERMANENT)
3269                                 continue;
3270
3271                         spin_lock(&ifp->lock);
3272                         /* We try to batch several events at once. */
3273                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3274
3275                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3276                             age >= ifp->valid_lft) {
3277                                 spin_unlock(&ifp->lock);
3278                                 in6_ifa_hold(ifp);
3279                                 ipv6_del_addr(ifp);
3280                                 goto restart;
3281                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3282                                 spin_unlock(&ifp->lock);
3283                                 continue;
3284                         } else if (age >= ifp->prefered_lft) {
3285                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3286                                 int deprecate = 0;
3287
3288                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3289                                         deprecate = 1;
3290                                         ifp->flags |= IFA_F_DEPRECATED;
3291                                 }
3292
3293                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3294                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3295
3296                                 spin_unlock(&ifp->lock);
3297
3298                                 if (deprecate) {
3299                                         in6_ifa_hold(ifp);
3300
3301                                         ipv6_ifa_notify(0, ifp);
3302                                         in6_ifa_put(ifp);
3303                                         goto restart;
3304                                 }
3305 #ifdef CONFIG_IPV6_PRIVACY
3306                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3307                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3308                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3309                                         ifp->idev->cnf.dad_transmits *
3310                                         ifp->idev->nd_parms->retrans_time / HZ;
3311
3312                                 if (age >= ifp->prefered_lft - regen_advance) {
3313                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3314                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3315                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3316                                         if (!ifp->regen_count && ifpub) {
3317                                                 ifp->regen_count++;
3318                                                 in6_ifa_hold(ifp);
3319                                                 in6_ifa_hold(ifpub);
3320                                                 spin_unlock(&ifp->lock);
3321
3322                                                 spin_lock(&ifpub->lock);
3323                                                 ifpub->regen_count = 0;
3324                                                 spin_unlock(&ifpub->lock);
3325                                                 ipv6_create_tempaddr(ifpub, ifp);
3326                                                 in6_ifa_put(ifpub);
3327                                                 in6_ifa_put(ifp);
3328                                                 goto restart;
3329                                         }
3330                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3331                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3332                                 spin_unlock(&ifp->lock);
3333 #endif
3334                         } else {
3335                                 /* ifp->prefered_lft <= ifp->valid_lft */
3336                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3337                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3338                                 spin_unlock(&ifp->lock);
3339                         }
3340                 }
3341         }
3342
3343         next_sec = round_jiffies_up(next);
3344         next_sched = next;
3345
3346         /* If rounded timeout is accurate enough, accept it. */
3347         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3348                 next_sched = next_sec;
3349
3350         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3351         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3352                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3353
3354         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3355               now, next, next_sec, next_sched));
3356
3357         addr_chk_timer.expires = next_sched;
3358         add_timer(&addr_chk_timer);
3359         spin_unlock(&addrconf_verify_lock);
3360         rcu_read_unlock_bh();
3361 }
3362
3363 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3364 {
3365         struct in6_addr *pfx = NULL;
3366
3367         if (addr)
3368                 pfx = nla_data(addr);
3369
3370         if (local) {
3371                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3372                         pfx = NULL;
3373                 else
3374                         pfx = nla_data(local);
3375         }
3376
3377         return pfx;
3378 }
3379
3380 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3381         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3382         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3383         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3384 };
3385
3386 static int
3387 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3388 {
3389         struct net *net = sock_net(skb->sk);
3390         struct ifaddrmsg *ifm;
3391         struct nlattr *tb[IFA_MAX+1];
3392         struct in6_addr *pfx;
3393         int err;
3394
3395         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3396         if (err < 0)
3397                 return err;
3398
3399         ifm = nlmsg_data(nlh);
3400         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3401         if (pfx == NULL)
3402                 return -EINVAL;
3403
3404         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3405 }
3406
3407 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3408                              u32 prefered_lft, u32 valid_lft)
3409 {
3410         u32 flags;
3411         clock_t expires;
3412         unsigned long timeout;
3413
3414         if (!valid_lft || (prefered_lft > valid_lft))
3415                 return -EINVAL;
3416
3417         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3418         if (addrconf_finite_timeout(timeout)) {
3419                 expires = jiffies_to_clock_t(timeout * HZ);
3420                 valid_lft = timeout;
3421                 flags = RTF_EXPIRES;
3422         } else {
3423                 expires = 0;
3424                 flags = 0;
3425                 ifa_flags |= IFA_F_PERMANENT;
3426         }
3427
3428         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3429         if (addrconf_finite_timeout(timeout)) {
3430                 if (timeout == 0)
3431                         ifa_flags |= IFA_F_DEPRECATED;
3432                 prefered_lft = timeout;
3433         }
3434
3435         spin_lock_bh(&ifp->lock);
3436         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3437         ifp->tstamp = jiffies;
3438         ifp->valid_lft = valid_lft;
3439         ifp->prefered_lft = prefered_lft;
3440
3441         spin_unlock_bh(&ifp->lock);
3442         if (!(ifp->flags&IFA_F_TENTATIVE))
3443                 ipv6_ifa_notify(0, ifp);
3444
3445         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3446                               expires, flags);
3447         addrconf_verify(0);
3448
3449         return 0;
3450 }
3451
3452 static int
3453 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3454 {
3455         struct net *net = sock_net(skb->sk);
3456         struct ifaddrmsg *ifm;
3457         struct nlattr *tb[IFA_MAX+1];
3458         struct in6_addr *pfx;
3459         struct inet6_ifaddr *ifa;
3460         struct net_device *dev;
3461         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3462         u8 ifa_flags;
3463         int err;
3464
3465         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3466         if (err < 0)
3467                 return err;
3468
3469         ifm = nlmsg_data(nlh);
3470         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3471         if (pfx == NULL)
3472                 return -EINVAL;
3473
3474         if (tb[IFA_CACHEINFO]) {
3475                 struct ifa_cacheinfo *ci;
3476
3477                 ci = nla_data(tb[IFA_CACHEINFO]);
3478                 valid_lft = ci->ifa_valid;
3479                 preferred_lft = ci->ifa_prefered;
3480         } else {
3481                 preferred_lft = INFINITY_LIFE_TIME;
3482                 valid_lft = INFINITY_LIFE_TIME;
3483         }
3484
3485         dev =  __dev_get_by_index(net, ifm->ifa_index);
3486         if (dev == NULL)
3487                 return -ENODEV;
3488
3489         /* We ignore other flags so far. */
3490         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3491
3492         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3493         if (ifa == NULL) {
3494                 /*
3495                  * It would be best to check for !NLM_F_CREATE here but
3496                  * userspace alreay relies on not having to provide this.
3497                  */
3498                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3499                                       ifm->ifa_prefixlen, ifa_flags,
3500                                       preferred_lft, valid_lft);
3501         }
3502
3503         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3504             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3505                 err = -EEXIST;
3506         else
3507                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3508
3509         in6_ifa_put(ifa);
3510
3511         return err;
3512 }
3513
3514 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3515                           u8 scope, int ifindex)
3516 {
3517         struct ifaddrmsg *ifm;
3518
3519         ifm = nlmsg_data(nlh);
3520         ifm->ifa_family = AF_INET6;
3521         ifm->ifa_prefixlen = prefixlen;
3522         ifm->ifa_flags = flags;
3523         ifm->ifa_scope = scope;
3524         ifm->ifa_index = ifindex;
3525 }
3526
3527 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3528                          unsigned long tstamp, u32 preferred, u32 valid)
3529 {
3530         struct ifa_cacheinfo ci;
3531
3532         ci.cstamp = cstamp_delta(cstamp);
3533         ci.tstamp = cstamp_delta(tstamp);
3534         ci.ifa_prefered = preferred;
3535         ci.ifa_valid = valid;
3536
3537         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3538 }
3539
3540 static inline int rt_scope(int ifa_scope)
3541 {
3542         if (ifa_scope & IFA_HOST)
3543                 return RT_SCOPE_HOST;
3544         else if (ifa_scope & IFA_LINK)
3545                 return RT_SCOPE_LINK;
3546         else if (ifa_scope & IFA_SITE)
3547                 return RT_SCOPE_SITE;
3548         else
3549                 return RT_SCOPE_UNIVERSE;
3550 }
3551
3552 static inline int inet6_ifaddr_msgsize(void)
3553 {
3554         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3555                + nla_total_size(16) /* IFA_ADDRESS */
3556                + nla_total_size(sizeof(struct ifa_cacheinfo));
3557 }
3558
3559 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3560                              u32 pid, u32 seq, int event, unsigned int flags)
3561 {
3562         struct nlmsghdr  *nlh;
3563         u32 preferred, valid;
3564
3565         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3566         if (nlh == NULL)
3567                 return -EMSGSIZE;
3568
3569         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3570                       ifa->idev->dev->ifindex);
3571
3572         if (!(ifa->flags&IFA_F_PERMANENT)) {
3573                 preferred = ifa->prefered_lft;
3574                 valid = ifa->valid_lft;
3575                 if (preferred != INFINITY_LIFE_TIME) {
3576                         long tval = (jiffies - ifa->tstamp)/HZ;
3577                         if (preferred > tval)
3578                                 preferred -= tval;
3579                         else
3580                                 preferred = 0;
3581                         if (valid != INFINITY_LIFE_TIME) {
3582                                 if (valid > tval)
3583                                         valid -= tval;
3584                                 else
3585                                         valid = 0;
3586                         }
3587                 }
3588         } else {
3589                 preferred = INFINITY_LIFE_TIME;
3590                 valid = INFINITY_LIFE_TIME;
3591         }
3592
3593         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3594             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3595                 nlmsg_cancel(skb, nlh);
3596                 return -EMSGSIZE;
3597         }
3598
3599         return nlmsg_end(skb, nlh);
3600 }
3601
3602 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3603                                 u32 pid, u32 seq, int event, u16 flags)
3604 {
3605         struct nlmsghdr  *nlh;
3606         u8 scope = RT_SCOPE_UNIVERSE;
3607         int ifindex = ifmca->idev->dev->ifindex;
3608
3609         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3610                 scope = RT_SCOPE_SITE;
3611
3612         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3613         if (nlh == NULL)
3614                 return -EMSGSIZE;
3615
3616         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3617         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3618             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3619                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3620                 nlmsg_cancel(skb, nlh);
3621                 return -EMSGSIZE;
3622         }
3623
3624         return nlmsg_end(skb, nlh);
3625 }
3626
3627 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3628                                 u32 pid, u32 seq, int event, unsigned int flags)
3629 {
3630         struct nlmsghdr  *nlh;
3631         u8 scope = RT_SCOPE_UNIVERSE;
3632         int ifindex = ifaca->aca_idev->dev->ifindex;
3633
3634         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3635                 scope = RT_SCOPE_SITE;
3636
3637         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3638         if (nlh == NULL)
3639                 return -EMSGSIZE;
3640
3641         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3642         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3643             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3644                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3645                 nlmsg_cancel(skb, nlh);
3646                 return -EMSGSIZE;
3647         }
3648
3649         return nlmsg_end(skb, nlh);
3650 }
3651
3652 enum addr_type_t {
3653         UNICAST_ADDR,
3654         MULTICAST_ADDR,
3655         ANYCAST_ADDR,
3656 };
3657
3658 /* called with rcu_read_lock() */
3659 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3660                           struct netlink_callback *cb, enum addr_type_t type,
3661                           int s_ip_idx, int *p_ip_idx)
3662 {
3663         struct ifmcaddr6 *ifmca;
3664         struct ifacaddr6 *ifaca;
3665         int err = 1;
3666         int ip_idx = *p_ip_idx;
3667
3668         read_lock_bh(&idev->lock);
3669         switch (type) {
3670         case UNICAST_ADDR: {
3671                 struct inet6_ifaddr *ifa;
3672
3673                 /* unicast address incl. temp addr */
3674                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3675                         if (++ip_idx < s_ip_idx)
3676                                 continue;
3677                         err = inet6_fill_ifaddr(skb, ifa,
3678                                                 NETLINK_CB(cb->skb).pid,
3679                                                 cb->nlh->nlmsg_seq,
3680                                                 RTM_NEWADDR,
3681                                                 NLM_F_MULTI);
3682                         if (err <= 0)
3683                                 break;
3684                 }
3685                 break;
3686         }
3687         case MULTICAST_ADDR:
3688                 /* multicast address */
3689                 for (ifmca = idev->mc_list; ifmca;
3690                      ifmca = ifmca->next, ip_idx++) {
3691                         if (ip_idx < s_ip_idx)
3692                                 continue;
3693                         err = inet6_fill_ifmcaddr(skb, ifmca,
3694                                                   NETLINK_CB(cb->skb).pid,
3695                                                   cb->nlh->nlmsg_seq,
3696                                                   RTM_GETMULTICAST,
3697                                                   NLM_F_MULTI);
3698                         if (err <= 0)
3699                                 break;
3700                 }
3701                 break;
3702         case ANYCAST_ADDR:
3703                 /* anycast address */
3704                 for (ifaca = idev->ac_list; ifaca;
3705                      ifaca = ifaca->aca_next, ip_idx++) {
3706                         if (ip_idx < s_ip_idx)
3707                                 continue;
3708                         err = inet6_fill_ifacaddr(skb, ifaca,
3709                                                   NETLINK_CB(cb->skb).pid,
3710                                                   cb->nlh->nlmsg_seq,
3711                                                   RTM_GETANYCAST,
3712                                                   NLM_F_MULTI);
3713                         if (err <= 0)
3714                                 break;
3715                 }
3716                 break;
3717         default:
3718                 break;
3719         }
3720         read_unlock_bh(&idev->lock);
3721         *p_ip_idx = ip_idx;
3722         return err;
3723 }
3724
3725 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3726                            enum addr_type_t type)
3727 {
3728         struct net *net = sock_net(skb->sk);
3729         int h, s_h;
3730         int idx, ip_idx;
3731         int s_idx, s_ip_idx;
3732         struct net_device *dev;
3733         struct inet6_dev *idev;
3734         struct hlist_head *head;
3735         struct hlist_node *node;
3736
3737         s_h = cb->args[0];
3738         s_idx = idx = cb->args[1];
3739         s_ip_idx = ip_idx = cb->args[2];
3740
3741         rcu_read_lock();
3742         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3743                 idx = 0;
3744                 head = &net->dev_index_head[h];
3745                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3746                         if (idx < s_idx)
3747                                 goto cont;
3748                         if (h > s_h || idx > s_idx)
3749                                 s_ip_idx = 0;
3750                         ip_idx = 0;
3751                         idev = __in6_dev_get(dev);
3752                         if (!idev)
3753                                 goto cont;
3754
3755                         if (in6_dump_addrs(idev, skb, cb, type,
3756                                            s_ip_idx, &ip_idx) <= 0)
3757                                 goto done;
3758 cont:
3759                         idx++;
3760                 }
3761         }
3762 done:
3763         rcu_read_unlock();
3764         cb->args[0] = h;
3765         cb->args[1] = idx;
3766         cb->args[2] = ip_idx;
3767
3768         return skb->len;
3769 }
3770
3771 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3772 {
3773         enum addr_type_t type = UNICAST_ADDR;
3774
3775         return inet6_dump_addr(skb, cb, type);
3776 }
3777
3778 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3779 {
3780         enum addr_type_t type = MULTICAST_ADDR;
3781
3782         return inet6_dump_addr(skb, cb, type);
3783 }
3784
3785
3786 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3787 {
3788         enum addr_type_t type = ANYCAST_ADDR;
3789
3790         return inet6_dump_addr(skb, cb, type);
3791 }
3792
3793 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3794                              void *arg)
3795 {
3796         struct net *net = sock_net(in_skb->sk);
3797         struct ifaddrmsg *ifm;
3798         struct nlattr *tb[IFA_MAX+1];
3799         struct in6_addr *addr = NULL;
3800         struct net_device *dev = NULL;
3801         struct inet6_ifaddr *ifa;
3802         struct sk_buff *skb;
3803         int err;
3804
3805         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3806         if (err < 0)
3807                 goto errout;
3808
3809         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3810         if (addr == NULL) {
3811                 err = -EINVAL;
3812                 goto errout;
3813         }
3814
3815         ifm = nlmsg_data(nlh);
3816         if (ifm->ifa_index)
3817                 dev = __dev_get_by_index(net, ifm->ifa_index);
3818
3819         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3820         if (!ifa) {
3821                 err = -EADDRNOTAVAIL;
3822                 goto errout;
3823         }
3824
3825         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3826         if (!skb) {
3827                 err = -ENOBUFS;
3828                 goto errout_ifa;
3829         }
3830
3831         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3832                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3833         if (err < 0) {
3834                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3835                 WARN_ON(err == -EMSGSIZE);
3836                 kfree_skb(skb);
3837                 goto errout_ifa;
3838         }
3839         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3840 errout_ifa:
3841         in6_ifa_put(ifa);
3842 errout:
3843         return err;
3844 }
3845
3846 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3847 {
3848         struct sk_buff *skb;
3849         struct net *net = dev_net(ifa->idev->dev);
3850         int err = -ENOBUFS;
3851
3852         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3853         if (skb == NULL)
3854                 goto errout;
3855
3856         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3857         if (err < 0) {
3858                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3859                 WARN_ON(err == -EMSGSIZE);
3860                 kfree_skb(skb);
3861                 goto errout;
3862         }
3863         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3864         return;
3865 errout:
3866         if (err < 0)
3867                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3868 }
3869
3870 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3871                                 __s32 *array, int bytes)
3872 {
3873         BUG_ON(bytes < (DEVCONF_MAX * 4));
3874
3875         memset(array, 0, bytes);
3876         array[DEVCONF_FORWARDING] = cnf->forwarding;
3877         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3878         array[DEVCONF_MTU6] = cnf->mtu6;
3879         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3880         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3881         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3882         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3883         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3884         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3885                 jiffies_to_msecs(cnf->rtr_solicit_interval);
3886         array[DEVCONF_RTR_SOLICIT_DELAY] =
3887                 jiffies_to_msecs(cnf->rtr_solicit_delay);
3888         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3889 #ifdef CONFIG_IPV6_PRIVACY
3890         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3891         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3892         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3893         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3894         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3895 #endif
3896         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3897         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3898         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3899 #ifdef CONFIG_IPV6_ROUTER_PREF
3900         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3901         array[DEVCONF_RTR_PROBE_INTERVAL] =
3902                 jiffies_to_msecs(cnf->rtr_probe_interval);
3903 #ifdef CONFIG_IPV6_ROUTE_INFO
3904         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3905 #endif
3906 #endif
3907         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3908         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3909 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3910         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3911 #endif
3912 #ifdef CONFIG_IPV6_MROUTE
3913         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3914 #endif
3915         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3916         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3917         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3918 }
3919
3920 static inline size_t inet6_ifla6_size(void)
3921 {
3922         return nla_total_size(4) /* IFLA_INET6_FLAGS */
3923              + nla_total_size(sizeof(struct ifla_cacheinfo))
3924              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3925              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3926              + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3927 }
3928
3929 static inline size_t inet6_if_nlmsg_size(void)
3930 {
3931         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3932                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3933                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3934                + nla_total_size(4) /* IFLA_MTU */
3935                + nla_total_size(4) /* IFLA_LINK */
3936                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3937 }
3938
3939 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3940                                       int items, int bytes)
3941 {
3942         int i;
3943         int pad = bytes - sizeof(u64) * items;
3944         BUG_ON(pad < 0);
3945
3946         /* Use put_unaligned() because stats may not be aligned for u64. */
3947         put_unaligned(items, &stats[0]);
3948         for (i = 1; i < items; i++)
3949                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3950
3951         memset(&stats[items], 0, pad);
3952 }
3953
3954 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3955                                       int items, int bytes, size_t syncpoff)
3956 {
3957         int i;
3958         int pad = bytes - sizeof(u64) * items;
3959         BUG_ON(pad < 0);
3960
3961         /* Use put_unaligned() because stats may not be aligned for u64. */
3962         put_unaligned(items, &stats[0]);
3963         for (i = 1; i < items; i++)
3964                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3965
3966         memset(&stats[items], 0, pad);
3967 }
3968
3969 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3970                              int bytes)
3971 {
3972         switch (attrtype) {
3973         case IFLA_INET6_STATS:
3974                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3975                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3976                 break;
3977         case IFLA_INET6_ICMP6STATS:
3978                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3979                 break;
3980         }
3981 }
3982
3983 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3984 {
3985         struct nlattr *nla;
3986         struct ifla_cacheinfo ci;
3987
3988         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3989
3990         ci.max_reasm_len = IPV6_MAXPLEN;
3991         ci.tstamp = cstamp_delta(idev->tstamp);
3992         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3993         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3994         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3995
3996         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3997         if (nla == NULL)
3998                 goto nla_put_failure;
3999         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4000
4001         /* XXX - MC not implemented */
4002
4003         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4004         if (nla == NULL)
4005                 goto nla_put_failure;
4006         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4007
4008         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4009         if (nla == NULL)
4010                 goto nla_put_failure;
4011         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4012
4013         return 0;
4014
4015 nla_put_failure:
4016         return -EMSGSIZE;
4017 }
4018
4019 static size_t inet6_get_link_af_size(const struct net_device *dev)
4020 {
4021         if (!__in6_dev_get(dev))
4022                 return 0;
4023
4024         return inet6_ifla6_size();
4025 }
4026
4027 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4028 {
4029         struct inet6_dev *idev = __in6_dev_get(dev);
4030
4031         if (!idev)
4032                 return -ENODATA;
4033
4034         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4035                 return -EMSGSIZE;
4036
4037         return 0;
4038 }
4039
4040 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4041                              u32 pid, u32 seq, int event, unsigned int flags)
4042 {
4043         struct net_device *dev = idev->dev;
4044         struct ifinfomsg *hdr;
4045         struct nlmsghdr *nlh;
4046         void *protoinfo;
4047
4048         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4049         if (nlh == NULL)
4050                 return -EMSGSIZE;
4051
4052         hdr = nlmsg_data(nlh);
4053         hdr->ifi_family = AF_INET6;
4054         hdr->__ifi_pad = 0;
4055         hdr->ifi_type = dev->type;
4056         hdr->ifi_index = dev->ifindex;
4057         hdr->ifi_flags = dev_get_flags(dev);
4058         hdr->ifi_change = 0;
4059
4060         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4061
4062         if (dev->addr_len)
4063                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4064
4065         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4066         if (dev->ifindex != dev->iflink)
4067                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4068
4069         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4070         if (protoinfo == NULL)
4071                 goto nla_put_failure;
4072
4073         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4074                 goto nla_put_failure;
4075
4076         nla_nest_end(skb, protoinfo);
4077         return nlmsg_end(skb, nlh);
4078
4079 nla_put_failure:
4080         nlmsg_cancel(skb, nlh);
4081         return -EMSGSIZE;
4082 }
4083
4084 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4085 {
4086         struct net *net = sock_net(skb->sk);
4087         int h, s_h;
4088         int idx = 0, s_idx;
4089         struct net_device *dev;
4090         struct inet6_dev *idev;
4091         struct hlist_head *head;
4092         struct hlist_node *node;
4093
4094         s_h = cb->args[0];
4095         s_idx = cb->args[1];
4096
4097         rcu_read_lock();
4098         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4099                 idx = 0;
4100                 head = &net->dev_index_head[h];
4101                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4102                         if (idx < s_idx)
4103                                 goto cont;
4104                         idev = __in6_dev_get(dev);
4105                         if (!idev)
4106                                 goto cont;
4107                         if (inet6_fill_ifinfo(skb, idev,
4108                                               NETLINK_CB(cb->skb).pid,
4109                                               cb->nlh->nlmsg_seq,
4110                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4111                                 goto out;
4112 cont:
4113                         idx++;
4114                 }
4115         }
4116 out:
4117         rcu_read_unlock();
4118         cb->args[1] = idx;
4119         cb->args[0] = h;
4120
4121         return skb->len;
4122 }
4123
4124 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4125 {
4126         struct sk_buff *skb;
4127         struct net *net = dev_net(idev->dev);
4128         int err = -ENOBUFS;
4129
4130         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4131         if (skb == NULL)
4132                 goto errout;
4133
4134         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4135         if (err < 0) {
4136                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4137                 WARN_ON(err == -EMSGSIZE);
4138                 kfree_skb(skb);
4139                 goto errout;
4140         }
4141         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4142         return;
4143 errout:
4144         if (err < 0)
4145                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4146 }
4147
4148 static inline size_t inet6_prefix_nlmsg_size(void)
4149 {
4150         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4151                + nla_total_size(sizeof(struct in6_addr))
4152                + nla_total_size(sizeof(struct prefix_cacheinfo));
4153 }
4154
4155 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4156                              struct prefix_info *pinfo, u32 pid, u32 seq,
4157                              int event, unsigned int flags)
4158 {
4159         struct prefixmsg *pmsg;
4160         struct nlmsghdr *nlh;
4161         struct prefix_cacheinfo ci;
4162
4163         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4164         if (nlh == NULL)
4165                 return -EMSGSIZE;
4166
4167         pmsg = nlmsg_data(nlh);
4168         pmsg->prefix_family = AF_INET6;
4169         pmsg->prefix_pad1 = 0;
4170         pmsg->prefix_pad2 = 0;
4171         pmsg->prefix_ifindex = idev->dev->ifindex;
4172         pmsg->prefix_len = pinfo->prefix_len;
4173         pmsg->prefix_type = pinfo->type;
4174         pmsg->prefix_pad3 = 0;
4175         pmsg->prefix_flags = 0;
4176         if (pinfo->onlink)
4177                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4178         if (pinfo->autoconf)
4179                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4180
4181         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4182
4183         ci.preferred_time = ntohl(pinfo->prefered);
4184         ci.valid_time = ntohl(pinfo->valid);
4185         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4186
4187         return nlmsg_end(skb, nlh);
4188
4189 nla_put_failure:
4190         nlmsg_cancel(skb, nlh);
4191         return -EMSGSIZE;
4192 }
4193
4194 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4195                          struct prefix_info *pinfo)
4196 {
4197         struct sk_buff *skb;
4198         struct net *net = dev_net(idev->dev);
4199         int err = -ENOBUFS;
4200
4201         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4202         if (skb == NULL)
4203                 goto errout;
4204
4205         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4206         if (err < 0) {
4207                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4208                 WARN_ON(err == -EMSGSIZE);
4209                 kfree_skb(skb);
4210                 goto errout;
4211         }
4212         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4213         return;
4214 errout:
4215         if (err < 0)
4216                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4217 }
4218
4219 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4220 {
4221         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4222
4223         switch (event) {
4224         case RTM_NEWADDR:
4225                 /*
4226                  * If the address was optimistic
4227                  * we inserted the route at the start of
4228                  * our DAD process, so we don't need
4229                  * to do it again
4230                  */
4231                 if (!(ifp->rt->rt6i_node))
4232                         ip6_ins_rt(ifp->rt);
4233                 if (ifp->idev->cnf.forwarding)
4234                         addrconf_join_anycast(ifp);
4235                 break;
4236         case RTM_DELADDR:
4237                 if (ifp->idev->cnf.forwarding)
4238                         addrconf_leave_anycast(ifp);
4239                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4240                 dst_hold(&ifp->rt->dst);
4241
4242                 if (ip6_del_rt(ifp->rt))
4243                         dst_free(&ifp->rt->dst);
4244                 break;
4245         }
4246 }
4247
4248 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4249 {
4250         rcu_read_lock_bh();
4251         if (likely(ifp->idev->dead == 0))
4252                 __ipv6_ifa_notify(event, ifp);
4253         rcu_read_unlock_bh();
4254 }
4255
4256 #ifdef CONFIG_SYSCTL
4257
4258 static
4259 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4260                            void __user *buffer, size_t *lenp, loff_t *ppos)
4261 {
4262         int *valp = ctl->data;
4263         int val = *valp;
4264         loff_t pos = *ppos;
4265         ctl_table lctl;
4266         int ret;
4267
4268         /*
4269          * ctl->data points to idev->cnf.forwarding, we should
4270          * not modify it until we get the rtnl lock.
4271          */
4272         lctl = *ctl;
4273         lctl.data = &val;
4274
4275         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4276
4277         if (write)
4278                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4279         if (ret)
4280                 *ppos = pos;
4281         return ret;
4282 }
4283
4284 static void dev_disable_change(struct inet6_dev *idev)
4285 {
4286         if (!idev || !idev->dev)
4287                 return;
4288
4289         if (idev->cnf.disable_ipv6)
4290                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4291         else
4292                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4293 }
4294
4295 static void addrconf_disable_change(struct net *net, __s32 newf)
4296 {
4297         struct net_device *dev;
4298         struct inet6_dev *idev;
4299
4300         rcu_read_lock();
4301         for_each_netdev_rcu(net, dev) {
4302                 idev = __in6_dev_get(dev);
4303                 if (idev) {
4304                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4305                         idev->cnf.disable_ipv6 = newf;
4306                         if (changed)
4307                                 dev_disable_change(idev);
4308                 }
4309         }
4310         rcu_read_unlock();
4311 }
4312
4313 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4314 {
4315         struct net *net;
4316         int old;
4317
4318         if (!rtnl_trylock())
4319                 return restart_syscall();
4320
4321         net = (struct net *)table->extra2;
4322         old = *p;
4323         *p = newf;
4324
4325         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4326                 rtnl_unlock();
4327                 return 0;
4328         }
4329
4330         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4331                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4332                 addrconf_disable_change(net, newf);
4333         } else if ((!newf) ^ (!old))
4334                 dev_disable_change((struct inet6_dev *)table->extra1);
4335
4336         rtnl_unlock();
4337         return 0;
4338 }
4339
4340 static
4341 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4342                             void __user *buffer, size_t *lenp, loff_t *ppos)
4343 {
4344         int *valp = ctl->data;
4345         int val = *valp;
4346         loff_t pos = *ppos;
4347         ctl_table lctl;
4348         int ret;
4349
4350         /*
4351          * ctl->data points to idev->cnf.disable_ipv6, we should
4352          * not modify it until we get the rtnl lock.
4353          */
4354         lctl = *ctl;
4355         lctl.data = &val;
4356
4357         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4358
4359         if (write)
4360                 ret = addrconf_disable_ipv6(ctl, valp, val);
4361         if (ret)
4362                 *ppos = pos;
4363         return ret;
4364 }
4365
4366 static struct addrconf_sysctl_table
4367 {
4368         struct ctl_table_header *sysctl_header;
4369         ctl_table addrconf_vars[DEVCONF_MAX+1];
4370         char *dev_name;
4371 } addrconf_sysctl __read_mostly = {
4372         .sysctl_header = NULL,
4373         .addrconf_vars = {
4374                 {
4375                         .procname       = "forwarding",
4376                         .data           = &ipv6_devconf.forwarding,
4377                         .maxlen         = sizeof(int),
4378                         .mode           = 0644,
4379                         .proc_handler   = addrconf_sysctl_forward,
4380                 },
4381                 {
4382                         .procname       = "hop_limit",
4383                         .data           = &ipv6_devconf.hop_limit,
4384                         .maxlen         = sizeof(int),
4385                         .mode           = 0644,
4386                         .proc_handler   = proc_dointvec,
4387                 },
4388                 {
4389                         .procname       = "mtu",
4390                         .data           = &ipv6_devconf.mtu6,
4391                         .maxlen         = sizeof(int),
4392                         .mode           = 0644,
4393                         .proc_handler   = proc_dointvec,
4394                 },
4395                 {
4396                         .procname       = "accept_ra",
4397                         .data           = &ipv6_devconf.accept_ra,
4398                         .maxlen         = sizeof(int),
4399                         .mode           = 0644,
4400                         .proc_handler   = proc_dointvec,
4401                 },
4402                 {
4403                         .procname       = "accept_redirects",
4404                         .data           = &ipv6_devconf.accept_redirects,
4405                         .maxlen         = sizeof(int),
4406                         .mode           = 0644,
4407                         .proc_handler   = proc_dointvec,
4408                 },
4409                 {
4410                         .procname       = "autoconf",
4411                         .data           = &ipv6_devconf.autoconf,
4412                         .maxlen         = sizeof(int),
4413                         .mode           = 0644,
4414                         .proc_handler   = proc_dointvec,
4415                 },
4416                 {
4417                         .procname       = "dad_transmits",
4418                         .data           = &ipv6_devconf.dad_transmits,
4419                         .maxlen         = sizeof(int),
4420                         .mode           = 0644,
4421                         .proc_handler   = proc_dointvec,
4422                 },
4423                 {
4424                         .procname       = "router_solicitations",
4425                         .data           = &ipv6_devconf.rtr_solicits,
4426                         .maxlen         = sizeof(int),
4427                         .mode           = 0644,
4428                         .proc_handler   = proc_dointvec,
4429                 },
4430                 {
4431                         .procname       = "router_solicitation_interval",
4432                         .data           = &ipv6_devconf.rtr_solicit_interval,
4433                         .maxlen         = sizeof(int),
4434                         .mode           = 0644,
4435                         .proc_handler   = proc_dointvec_jiffies,
4436                 },
4437                 {
4438                         .procname       = "router_solicitation_delay",
4439                         .data           = &ipv6_devconf.rtr_solicit_delay,
4440                         .maxlen         = sizeof(int),
4441                         .mode           = 0644,
4442                         .proc_handler   = proc_dointvec_jiffies,
4443                 },
4444                 {
4445                         .procname       = "force_mld_version",
4446                         .data           = &ipv6_devconf.force_mld_version,
4447                         .maxlen         = sizeof(int),
4448                         .mode           = 0644,
4449                         .proc_handler   = proc_dointvec,
4450                 },
4451 #ifdef CONFIG_IPV6_PRIVACY
4452                 {
4453                         .procname       = "use_tempaddr",
4454                         .data           = &ipv6_devconf.use_tempaddr,
4455                         .maxlen         = sizeof(int),
4456                         .mode           = 0644,
4457                         .proc_handler   = proc_dointvec,
4458                 },
4459                 {
4460                         .procname       = "temp_valid_lft",
4461                         .data           = &ipv6_devconf.temp_valid_lft,
4462                         .maxlen         = sizeof(int),
4463                         .mode           = 0644,
4464                         .proc_handler   = proc_dointvec,
4465                 },
4466                 {
4467                         .procname       = "temp_prefered_lft",
4468                         .data           = &ipv6_devconf.temp_prefered_lft,
4469                         .maxlen         = sizeof(int),
4470                         .mode           = 0644,
4471                         .proc_handler   = proc_dointvec,
4472                 },
4473                 {
4474                         .procname       = "regen_max_retry",
4475                         .data           = &ipv6_devconf.regen_max_retry,
4476                         .maxlen         = sizeof(int),
4477                         .mode           = 0644,
4478                         .proc_handler   = proc_dointvec,
4479                 },
4480                 {
4481                         .procname       = "max_desync_factor",
4482                         .data           = &ipv6_devconf.max_desync_factor,
4483                         .maxlen         = sizeof(int),
4484                         .mode           = 0644,
4485                         .proc_handler   = proc_dointvec,
4486                 },
4487 #endif
4488                 {
4489                         .procname       = "max_addresses",
4490                         .data           = &ipv6_devconf.max_addresses,
4491                         .maxlen         = sizeof(int),
4492                         .mode           = 0644,
4493                         .proc_handler   = proc_dointvec,
4494                 },
4495                 {
4496                         .procname       = "accept_ra_defrtr",
4497                         .data           = &ipv6_devconf.accept_ra_defrtr,
4498                         .maxlen         = sizeof(int),
4499                         .mode           = 0644,
4500                         .proc_handler   = proc_dointvec,
4501                 },
4502                 {
4503                         .procname       = "accept_ra_pinfo",
4504                         .data           = &ipv6_devconf.accept_ra_pinfo,
4505                         .maxlen         = sizeof(int),
4506                         .mode           = 0644,
4507                         .proc_handler   = proc_dointvec,
4508                 },
4509 #ifdef CONFIG_IPV6_ROUTER_PREF
4510                 {
4511                         .procname       = "accept_ra_rtr_pref",
4512                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4513                         .maxlen         = sizeof(int),
4514                         .mode           = 0644,
4515                         .proc_handler   = proc_dointvec,
4516                 },
4517                 {
4518                         .procname       = "router_probe_interval",
4519                         .data           = &ipv6_devconf.rtr_probe_interval,
4520                         .maxlen         = sizeof(int),
4521                         .mode           = 0644,
4522                         .proc_handler   = proc_dointvec_jiffies,
4523                 },
4524 #ifdef CONFIG_IPV6_ROUTE_INFO
4525                 {
4526                         .procname       = "accept_ra_rt_info_max_plen",
4527                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4528                         .maxlen         = sizeof(int),
4529                         .mode           = 0644,
4530                         .proc_handler   = proc_dointvec,
4531                 },
4532 #endif
4533 #endif
4534                 {
4535                         .procname       = "proxy_ndp",
4536                         .data           = &ipv6_devconf.proxy_ndp,
4537                         .maxlen         = sizeof(int),
4538                         .mode           = 0644,
4539                         .proc_handler   = proc_dointvec,
4540                 },
4541                 {
4542                         .procname       = "accept_source_route",
4543                         .data           = &ipv6_devconf.accept_source_route,
4544                         .maxlen         = sizeof(int),
4545                         .mode           = 0644,
4546                         .proc_handler   = proc_dointvec,
4547                 },
4548 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4549                 {
4550                         .procname       = "optimistic_dad",
4551                         .data           = &ipv6_devconf.optimistic_dad,
4552                         .maxlen         = sizeof(int),
4553                         .mode           = 0644,
4554                         .proc_handler   = proc_dointvec,
4555
4556                 },
4557 #endif
4558 #ifdef CONFIG_IPV6_MROUTE
4559                 {
4560                         .procname       = "mc_forwarding",
4561                         .data           = &ipv6_devconf.mc_forwarding,
4562                         .maxlen         = sizeof(int),
4563                         .mode           = 0444,
4564                         .proc_handler   = proc_dointvec,
4565                 },
4566 #endif
4567                 {
4568                         .procname       = "disable_ipv6",
4569                         .data           = &ipv6_devconf.disable_ipv6,
4570                         .maxlen         = sizeof(int),
4571                         .mode           = 0644,
4572                         .proc_handler   = addrconf_sysctl_disable,
4573                 },
4574                 {
4575                         .procname       = "accept_dad",
4576                         .data           = &ipv6_devconf.accept_dad,
4577                         .maxlen         = sizeof(int),
4578                         .mode           = 0644,
4579                         .proc_handler   = proc_dointvec,
4580                 },
4581                 {
4582                         .procname       = "force_tllao",
4583                         .data           = &ipv6_devconf.force_tllao,
4584                         .maxlen         = sizeof(int),
4585                         .mode           = 0644,
4586                         .proc_handler   = proc_dointvec
4587                 },
4588                 {
4589                         /* sentinel */
4590                 }
4591         },
4592 };
4593
4594 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4595                 struct inet6_dev *idev, struct ipv6_devconf *p)
4596 {
4597         int i;
4598         struct addrconf_sysctl_table *t;
4599
4600 #define ADDRCONF_CTL_PATH_DEV   3
4601
4602         struct ctl_path addrconf_ctl_path[] = {
4603                 { .procname = "net", },
4604                 { .procname = "ipv6", },
4605                 { .procname = "conf", },
4606                 { /* to be set */ },
4607                 { },
4608         };
4609
4610
4611         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4612         if (t == NULL)
4613                 goto out;
4614
4615         for (i = 0; t->addrconf_vars[i].data; i++) {
4616                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4617                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4618                 t->addrconf_vars[i].extra2 = net;
4619         }
4620
4621         /*
4622          * Make a copy of dev_name, because '.procname' is regarded as const
4623          * by sysctl and we wouldn't want anyone to change it under our feet
4624          * (see SIOCSIFNAME).
4625          */
4626         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4627         if (!t->dev_name)
4628                 goto free;
4629
4630         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4631
4632         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4633                         t->addrconf_vars);
4634         if (t->sysctl_header == NULL)
4635                 goto free_procname;
4636
4637         p->sysctl = t;
4638         return 0;
4639
4640 free_procname:
4641         kfree(t->dev_name);
4642 free:
4643         kfree(t);
4644 out:
4645         return -ENOBUFS;
4646 }
4647
4648 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4649 {
4650         struct addrconf_sysctl_table *t;
4651
4652         if (p->sysctl == NULL)
4653                 return;
4654
4655         t = p->sysctl;
4656         p->sysctl = NULL;
4657         unregister_net_sysctl_table(t->sysctl_header);
4658         kfree(t->dev_name);
4659         kfree(t);
4660 }
4661
4662 static void addrconf_sysctl_register(struct inet6_dev *idev)
4663 {
4664         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4665                               &ndisc_ifinfo_sysctl_change);
4666         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4667                                         idev, &idev->cnf);
4668 }
4669
4670 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4671 {
4672         __addrconf_sysctl_unregister(&idev->cnf);
4673         neigh_sysctl_unregister(idev->nd_parms);
4674 }
4675
4676
4677 #endif
4678
4679 static int __net_init addrconf_init_net(struct net *net)
4680 {
4681         int err;
4682         struct ipv6_devconf *all, *dflt;
4683
4684         err = -ENOMEM;
4685         all = &ipv6_devconf;
4686         dflt = &ipv6_devconf_dflt;
4687
4688         if (!net_eq(net, &init_net)) {
4689                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4690                 if (all == NULL)
4691                         goto err_alloc_all;
4692
4693                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4694                 if (dflt == NULL)
4695                         goto err_alloc_dflt;
4696         } else {
4697                 /* these will be inherited by all namespaces */
4698                 dflt->autoconf = ipv6_defaults.autoconf;
4699                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4700         }
4701
4702         net->ipv6.devconf_all = all;
4703         net->ipv6.devconf_dflt = dflt;
4704
4705 #ifdef CONFIG_SYSCTL
4706         err = __addrconf_sysctl_register(net, "all", NULL, all);
4707         if (err < 0)
4708                 goto err_reg_all;
4709
4710         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4711         if (err < 0)
4712                 goto err_reg_dflt;
4713 #endif
4714         return 0;
4715
4716 #ifdef CONFIG_SYSCTL
4717 err_reg_dflt:
4718         __addrconf_sysctl_unregister(all);
4719 err_reg_all:
4720         kfree(dflt);
4721 #endif
4722 err_alloc_dflt:
4723         kfree(all);
4724 err_alloc_all:
4725         return err;
4726 }
4727
4728 static void __net_exit addrconf_exit_net(struct net *net)
4729 {
4730 #ifdef CONFIG_SYSCTL
4731         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4732         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4733 #endif
4734         if (!net_eq(net, &init_net)) {
4735                 kfree(net->ipv6.devconf_dflt);
4736                 kfree(net->ipv6.devconf_all);
4737         }
4738 }
4739
4740 static struct pernet_operations addrconf_ops = {
4741         .init = addrconf_init_net,
4742         .exit = addrconf_exit_net,
4743 };
4744
4745 /*
4746  *      Device notifier
4747  */
4748
4749 int register_inet6addr_notifier(struct notifier_block *nb)
4750 {
4751         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4752 }
4753 EXPORT_SYMBOL(register_inet6addr_notifier);
4754
4755 int unregister_inet6addr_notifier(struct notifier_block *nb)
4756 {
4757         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4758 }
4759 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4760
4761 static struct rtnl_af_ops inet6_ops = {
4762         .family           = AF_INET6,
4763         .fill_link_af     = inet6_fill_link_af,
4764         .get_link_af_size = inet6_get_link_af_size,
4765 };
4766
4767 /*
4768  *      Init / cleanup code
4769  */
4770
4771 int __init addrconf_init(void)
4772 {
4773         int i, err;
4774
4775         err = ipv6_addr_label_init();
4776         if (err < 0) {
4777                 printk(KERN_CRIT "IPv6 Addrconf:"
4778                        " cannot initialize default policy table: %d.\n", err);
4779                 goto out;
4780         }
4781
4782         err = register_pernet_subsys(&addrconf_ops);
4783         if (err < 0)
4784                 goto out_addrlabel;
4785
4786         /* The addrconf netdev notifier requires that loopback_dev
4787          * has it's ipv6 private information allocated and setup
4788          * before it can bring up and give link-local addresses
4789          * to other devices which are up.
4790          *
4791          * Unfortunately, loopback_dev is not necessarily the first
4792          * entry in the global dev_base list of net devices.  In fact,
4793          * it is likely to be the very last entry on that list.
4794          * So this causes the notifier registry below to try and
4795          * give link-local addresses to all devices besides loopback_dev
4796          * first, then loopback_dev, which cases all the non-loopback_dev
4797          * devices to fail to get a link-local address.
4798          *
4799          * So, as a temporary fix, allocate the ipv6 structure for
4800          * loopback_dev first by hand.
4801          * Longer term, all of the dependencies ipv6 has upon the loopback
4802          * device and it being up should be removed.
4803          */
4804         rtnl_lock();
4805         if (!ipv6_add_dev(init_net.loopback_dev))
4806                 err = -ENOMEM;
4807         rtnl_unlock();
4808         if (err)
4809                 goto errlo;
4810
4811         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4812                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4813
4814         register_netdevice_notifier(&ipv6_dev_notf);
4815
4816         addrconf_verify(0);
4817
4818         err = rtnl_af_register(&inet6_ops);
4819         if (err < 0)
4820                 goto errout_af;
4821
4822         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4823                               NULL);
4824         if (err < 0)
4825                 goto errout;
4826
4827         /* Only the first call to __rtnl_register can fail */
4828         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4829         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4830         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4831                         inet6_dump_ifaddr, NULL);
4832         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4833                         inet6_dump_ifmcaddr, NULL);
4834         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4835                         inet6_dump_ifacaddr, NULL);
4836
4837         ipv6_addr_label_rtnl_register();
4838
4839         return 0;
4840 errout:
4841         rtnl_af_unregister(&inet6_ops);
4842 errout_af:
4843         unregister_netdevice_notifier(&ipv6_dev_notf);
4844 errlo:
4845         unregister_pernet_subsys(&addrconf_ops);
4846 out_addrlabel:
4847         ipv6_addr_label_cleanup();
4848 out:
4849         return err;
4850 }
4851
4852 void addrconf_cleanup(void)
4853 {
4854         struct net_device *dev;
4855         int i;
4856
4857         unregister_netdevice_notifier(&ipv6_dev_notf);
4858         unregister_pernet_subsys(&addrconf_ops);
4859         ipv6_addr_label_cleanup();
4860
4861         rtnl_lock();
4862
4863         __rtnl_af_unregister(&inet6_ops);
4864
4865         /* clean dev list */
4866         for_each_netdev(&init_net, dev) {
4867                 if (__in6_dev_get(dev) == NULL)
4868                         continue;
4869                 addrconf_ifdown(dev, 1);
4870         }
4871         addrconf_ifdown(init_net.loopback_dev, 2);
4872
4873         /*
4874          *      Check hash table.
4875          */
4876         spin_lock_bh(&addrconf_hash_lock);
4877         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4878                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4879         spin_unlock_bh(&addrconf_hash_lock);
4880
4881         del_timer(&addr_chk_timer);
4882         rtnl_unlock();
4883 }