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