linux/net/ipv6/addrconf.c
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   1/*
   2 *      IPv6 Address [auto]configuration
   3 *      Linux INET6 implementation
   4 *
   5 *      Authors:
   6 *      Pedro Roque             <roque@di.fc.ul.pt>
   7 *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8 *
   9 *      This program is free software; you can redistribute it and/or
  10 *      modify it under the terms of the GNU General Public License
  11 *      as published by the Free Software Foundation; either version
  12 *      2 of the License, or (at your option) any later version.
  13 */
  14
  15/*
  16 *      Changes:
  17 *
  18 *      Janos Farkas                    :       delete timer on ifdown
  19 *      <chexum@bankinf.banki.hu>
  20 *      Andi Kleen                      :       kill double kfree on module
  21 *                                              unload.
  22 *      Maciej W. Rozycki               :       FDDI support
  23 *      sekiya@USAGI                    :       Don't send too many RS
  24 *                                              packets.
  25 *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26 *                                              packets.
  27 *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28 *                                              address validation timer.
  29 *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30 *                                              support.
  31 *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32 *                                              address on a same interface.
  33 *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34 *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35 *                                              seq_file.
  36 *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37 *                                              selection; consider scope,
  38 *                                              status etc.
  39 */
  40
  41#include <linux/errno.h>
  42#include <linux/types.h>
  43#include <linux/kernel.h>
  44#include <linux/socket.h>
  45#include <linux/sockios.h>
  46#include <linux/net.h>
  47#include <linux/in6.h>
  48#include <linux/netdevice.h>
  49#include <linux/if_addr.h>
  50#include <linux/if_arp.h>
  51#include <linux/if_arcnet.h>
  52#include <linux/if_infiniband.h>
  53#include <linux/route.h>
  54#include <linux/inetdevice.h>
  55#include <linux/init.h>
  56#ifdef CONFIG_SYSCTL
  57#include <linux/sysctl.h>
  58#endif
  59#include <linux/capability.h>
  60#include <linux/delay.h>
  61#include <linux/notifier.h>
  62#include <linux/string.h>
  63
  64#include <net/net_namespace.h>
  65#include <net/sock.h>
  66#include <net/snmp.h>
  67
  68#include <net/ipv6.h>
  69#include <net/protocol.h>
  70#include <net/ndisc.h>
  71#include <net/ip6_route.h>
  72#include <net/addrconf.h>
  73#include <net/tcp.h>
  74#include <net/ip.h>
  75#include <net/netlink.h>
  76#include <net/pkt_sched.h>
  77#include <linux/if_tunnel.h>
  78#include <linux/rtnetlink.h>
  79
  80#ifdef CONFIG_IPV6_PRIVACY
  81#include <linux/random.h>
  82#endif
  83
  84#include <asm/uaccess.h>
  85#include <asm/unaligned.h>
  86
  87#include <linux/proc_fs.h>
  88#include <linux/seq_file.h>
  89
  90/* Set to 3 to get tracing... */
  91#define ACONF_DEBUG 2
  92
  93#if ACONF_DEBUG >= 3
  94#define ADBG(x) printk x
  95#else
  96#define ADBG(x)
  97#endif
  98
  99#define INFINITY_LIFE_TIME      0xFFFFFFFF
 100#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 101
 102#ifdef CONFIG_SYSCTL
 103static void addrconf_sysctl_register(struct inet6_dev *idev);
 104static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 105#else
 106static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 107{
 108}
 109
 110static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 111{
 112}
 113#endif
 114
 115#ifdef CONFIG_IPV6_PRIVACY
 116static int __ipv6_regen_rndid(struct inet6_dev *idev);
 117static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 118static void ipv6_regen_rndid(unsigned long data);
 119
 120static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 121#endif
 122
 123static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 124static int ipv6_count_addresses(struct inet6_dev *idev);
 125
 126/*
 127 *      Configured unicast address hash table
 128 */
 129static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 130static DEFINE_RWLOCK(addrconf_hash_lock);
 131
 132static void addrconf_verify(unsigned long);
 133
 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 135static DEFINE_SPINLOCK(addrconf_verify_lock);
 136
 137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 139
 140static int addrconf_ifdown(struct net_device *dev, int how);
 141
 142static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 143static void addrconf_dad_timer(unsigned long data);
 144static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 145static void addrconf_dad_run(struct inet6_dev *idev);
 146static void addrconf_rs_timer(unsigned long data);
 147static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 148static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 149
 150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 151                                struct prefix_info *pinfo);
 152static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 153                              struct net_device *dev);
 154
 155static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 156
 157static struct ipv6_devconf ipv6_devconf __read_mostly = {
 158        .forwarding             = 0,
 159        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 160        .mtu6                   = IPV6_MIN_MTU,
 161        .accept_ra              = 1,
 162        .accept_redirects       = 1,
 163        .autoconf               = 1,
 164        .force_mld_version      = 0,
 165        .dad_transmits          = 1,
 166        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 167        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 168        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 169#ifdef CONFIG_IPV6_PRIVACY
 170        .use_tempaddr           = 0,
 171        .temp_valid_lft         = TEMP_VALID_LIFETIME,
 172        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 173        .regen_max_retry        = REGEN_MAX_RETRY,
 174        .max_desync_factor      = MAX_DESYNC_FACTOR,
 175#endif
 176        .max_addresses          = IPV6_MAX_ADDRESSES,
 177        .accept_ra_defrtr       = 1,
 178        .accept_ra_pinfo        = 1,
 179#ifdef CONFIG_IPV6_ROUTER_PREF
 180        .accept_ra_rtr_pref     = 1,
 181        .rtr_probe_interval     = 60 * HZ,
 182#ifdef CONFIG_IPV6_ROUTE_INFO
 183        .accept_ra_rt_info_max_plen = 0,
 184#endif
 185#endif
 186        .proxy_ndp              = 0,
 187        .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 188        .disable_ipv6           = 0,
 189        .accept_dad             = 1,
 190};
 191
 192static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 193        .forwarding             = 0,
 194        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 195        .mtu6                   = IPV6_MIN_MTU,
 196        .accept_ra              = 1,
 197        .accept_redirects       = 1,
 198        .autoconf               = 1,
 199        .dad_transmits          = 1,
 200        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 201        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 202        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 203#ifdef CONFIG_IPV6_PRIVACY
 204        .use_tempaddr           = 0,
 205        .temp_valid_lft         = TEMP_VALID_LIFETIME,
 206        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 207        .regen_max_retry        = REGEN_MAX_RETRY,
 208        .max_desync_factor      = MAX_DESYNC_FACTOR,
 209#endif
 210        .max_addresses          = IPV6_MAX_ADDRESSES,
 211        .accept_ra_defrtr       = 1,
 212        .accept_ra_pinfo        = 1,
 213#ifdef CONFIG_IPV6_ROUTER_PREF
 214        .accept_ra_rtr_pref     = 1,
 215        .rtr_probe_interval     = 60 * HZ,
 216#ifdef CONFIG_IPV6_ROUTE_INFO
 217        .accept_ra_rt_info_max_plen = 0,
 218#endif
 219#endif
 220        .proxy_ndp              = 0,
 221        .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 222        .disable_ipv6           = 0,
 223        .accept_dad             = 1,
 224};
 225
 226/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 227const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 228const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 229const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 230const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 231
 232/* Check if a valid qdisc is available */
 233static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 234{
 235        return !qdisc_tx_is_noop(dev);
 236}
 237
 238/* Check if a route is valid prefix route */
 239static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 240{
 241        return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
 242}
 243
 244static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 245{
 246        if (del_timer(&ifp->timer))
 247                __in6_ifa_put(ifp);
 248}
 249
 250enum addrconf_timer_t
 251{
 252        AC_NONE,
 253        AC_DAD,
 254        AC_RS,
 255};
 256
 257static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 258                               enum addrconf_timer_t what,
 259                               unsigned long when)
 260{
 261        if (!del_timer(&ifp->timer))
 262                in6_ifa_hold(ifp);
 263
 264        switch (what) {
 265        case AC_DAD:
 266                ifp->timer.function = addrconf_dad_timer;
 267                break;
 268        case AC_RS:
 269                ifp->timer.function = addrconf_rs_timer;
 270                break;
 271        default:;
 272        }
 273        ifp->timer.expires = jiffies + when;
 274        add_timer(&ifp->timer);
 275}
 276
 277static int snmp6_alloc_dev(struct inet6_dev *idev)
 278{
 279        if (snmp_mib_init((void **)idev->stats.ipv6,
 280                          sizeof(struct ipstats_mib)) < 0)
 281                goto err_ip;
 282        if (snmp_mib_init((void **)idev->stats.icmpv6,
 283                          sizeof(struct icmpv6_mib)) < 0)
 284                goto err_icmp;
 285        if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 286                          sizeof(struct icmpv6msg_mib)) < 0)
 287                goto err_icmpmsg;
 288
 289        return 0;
 290
 291err_icmpmsg:
 292        snmp_mib_free((void **)idev->stats.icmpv6);
 293err_icmp:
 294        snmp_mib_free((void **)idev->stats.ipv6);
 295err_ip:
 296        return -ENOMEM;
 297}
 298
 299static void snmp6_free_dev(struct inet6_dev *idev)
 300{
 301        snmp_mib_free((void **)idev->stats.icmpv6msg);
 302        snmp_mib_free((void **)idev->stats.icmpv6);
 303        snmp_mib_free((void **)idev->stats.ipv6);
 304}
 305
 306/* Nobody refers to this device, we may destroy it. */
 307
 308static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 309{
 310        struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 311        kfree(idev);
 312}
 313
 314void in6_dev_finish_destroy(struct inet6_dev *idev)
 315{
 316        struct net_device *dev = idev->dev;
 317
 318        WARN_ON(idev->addr_list != NULL);
 319        WARN_ON(idev->mc_list != NULL);
 320
 321#ifdef NET_REFCNT_DEBUG
 322        printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 323#endif
 324        dev_put(dev);
 325        if (!idev->dead) {
 326                printk("Freeing alive inet6 device %p\n", idev);
 327                return;
 328        }
 329        snmp6_free_dev(idev);
 330        call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 331}
 332
 333EXPORT_SYMBOL(in6_dev_finish_destroy);
 334
 335static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 336{
 337        struct inet6_dev *ndev;
 338
 339        ASSERT_RTNL();
 340
 341        if (dev->mtu < IPV6_MIN_MTU)
 342                return NULL;
 343
 344        ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 345
 346        if (ndev == NULL)
 347                return NULL;
 348
 349        rwlock_init(&ndev->lock);
 350        ndev->dev = dev;
 351        memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 352        ndev->cnf.mtu6 = dev->mtu;
 353        ndev->cnf.sysctl = NULL;
 354        ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 355        if (ndev->nd_parms == NULL) {
 356                kfree(ndev);
 357                return NULL;
 358        }
 359        if (ndev->cnf.forwarding)
 360                dev_disable_lro(dev);
 361        /* We refer to the device */
 362        dev_hold(dev);
 363
 364        if (snmp6_alloc_dev(ndev) < 0) {
 365                ADBG((KERN_WARNING
 366                        "%s(): cannot allocate memory for statistics; dev=%s.\n",
 367                        __func__, dev->name));
 368                neigh_parms_release(&nd_tbl, ndev->nd_parms);
 369                ndev->dead = 1;
 370                in6_dev_finish_destroy(ndev);
 371                return NULL;
 372        }
 373
 374        if (snmp6_register_dev(ndev) < 0) {
 375                ADBG((KERN_WARNING
 376                        "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 377                        __func__, dev->name));
 378                neigh_parms_release(&nd_tbl, ndev->nd_parms);
 379                ndev->dead = 1;
 380                in6_dev_finish_destroy(ndev);
 381                return NULL;
 382        }
 383
 384        /* One reference from device.  We must do this before
 385         * we invoke __ipv6_regen_rndid().
 386         */
 387        in6_dev_hold(ndev);
 388
 389        if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 390                ndev->cnf.accept_dad = -1;
 391
 392#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 393        if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 394                printk(KERN_INFO
 395                       "%s: Disabled Multicast RS\n",
 396                       dev->name);
 397                ndev->cnf.rtr_solicits = 0;
 398        }
 399#endif
 400
 401#ifdef CONFIG_IPV6_PRIVACY
 402        setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 403        if ((dev->flags&IFF_LOOPBACK) ||
 404            dev->type == ARPHRD_TUNNEL ||
 405            dev->type == ARPHRD_TUNNEL6 ||
 406            dev->type == ARPHRD_SIT ||
 407            dev->type == ARPHRD_NONE) {
 408                printk(KERN_INFO
 409                       "%s: Disabled Privacy Extensions\n",
 410                       dev->name);
 411                ndev->cnf.use_tempaddr = -1;
 412        } else {
 413                in6_dev_hold(ndev);
 414                ipv6_regen_rndid((unsigned long) ndev);
 415        }
 416#endif
 417
 418        if (netif_running(dev) && addrconf_qdisc_ok(dev))
 419                ndev->if_flags |= IF_READY;
 420
 421        ipv6_mc_init_dev(ndev);
 422        ndev->tstamp = jiffies;
 423        addrconf_sysctl_register(ndev);
 424        /* protected by rtnl_lock */
 425        rcu_assign_pointer(dev->ip6_ptr, ndev);
 426
 427        /* Join all-node multicast group */
 428        ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 429
 430        return ndev;
 431}
 432
 433static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 434{
 435        struct inet6_dev *idev;
 436
 437        ASSERT_RTNL();
 438
 439        if ((idev = __in6_dev_get(dev)) == NULL) {
 440                if ((idev = ipv6_add_dev(dev)) == NULL)
 441                        return NULL;
 442        }
 443
 444        if (dev->flags&IFF_UP)
 445                ipv6_mc_up(idev);
 446        return idev;
 447}
 448
 449#ifdef CONFIG_SYSCTL
 450static void dev_forward_change(struct inet6_dev *idev)
 451{
 452        struct net_device *dev;
 453        struct inet6_ifaddr *ifa;
 454
 455        if (!idev)
 456                return;
 457        dev = idev->dev;
 458        if (idev->cnf.forwarding)
 459                dev_disable_lro(dev);
 460        if (dev && (dev->flags & IFF_MULTICAST)) {
 461                if (idev->cnf.forwarding)
 462                        ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 463                else
 464                        ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 465        }
 466        for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 467                if (ifa->flags&IFA_F_TENTATIVE)
 468                        continue;
 469                if (idev->cnf.forwarding)
 470                        addrconf_join_anycast(ifa);
 471                else
 472                        addrconf_leave_anycast(ifa);
 473        }
 474}
 475
 476
 477static void addrconf_forward_change(struct net *net, __s32 newf)
 478{
 479        struct net_device *dev;
 480        struct inet6_dev *idev;
 481
 482        read_lock(&dev_base_lock);
 483        for_each_netdev(net, dev) {
 484                rcu_read_lock();
 485                idev = __in6_dev_get(dev);
 486                if (idev) {
 487                        int changed = (!idev->cnf.forwarding) ^ (!newf);
 488                        idev->cnf.forwarding = newf;
 489                        if (changed)
 490                                dev_forward_change(idev);
 491                }
 492                rcu_read_unlock();
 493        }
 494        read_unlock(&dev_base_lock);
 495}
 496
 497static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 498{
 499        struct net *net;
 500
 501        net = (struct net *)table->extra2;
 502        if (p == &net->ipv6.devconf_dflt->forwarding)
 503                return 0;
 504
 505        if (!rtnl_trylock())
 506                return -ERESTARTSYS;
 507
 508        if (p == &net->ipv6.devconf_all->forwarding) {
 509                __s32 newf = net->ipv6.devconf_all->forwarding;
 510                net->ipv6.devconf_dflt->forwarding = newf;
 511                addrconf_forward_change(net, newf);
 512        } else if ((!*p) ^ (!old))
 513                dev_forward_change((struct inet6_dev *)table->extra1);
 514        rtnl_unlock();
 515
 516        if (*p)
 517                rt6_purge_dflt_routers(net);
 518        return 1;
 519}
 520#endif
 521
 522/* Nobody refers to this ifaddr, destroy it */
 523
 524void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 525{
 526        WARN_ON(ifp->if_next != NULL);
 527        WARN_ON(ifp->lst_next != NULL);
 528
 529#ifdef NET_REFCNT_DEBUG
 530        printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 531#endif
 532
 533        in6_dev_put(ifp->idev);
 534
 535        if (del_timer(&ifp->timer))
 536                printk("Timer is still running, when freeing ifa=%p\n", ifp);
 537
 538        if (!ifp->dead) {
 539                printk("Freeing alive inet6 address %p\n", ifp);
 540                return;
 541        }
 542        dst_release(&ifp->rt->u.dst);
 543
 544        kfree(ifp);
 545}
 546
 547static void
 548ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 549{
 550        struct inet6_ifaddr *ifa, **ifap;
 551        int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 552
 553        /*
 554         * Each device address list is sorted in order of scope -
 555         * global before linklocal.
 556         */
 557        for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 558             ifap = &ifa->if_next) {
 559                if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 560                        break;
 561        }
 562
 563        ifp->if_next = *ifap;
 564        *ifap = ifp;
 565}
 566
 567/*
 568 *      Hash function taken from net_alias.c
 569 */
 570static u8 ipv6_addr_hash(const struct in6_addr *addr)
 571{
 572        __u32 word;
 573
 574        /*
 575         * We perform the hash function over the last 64 bits of the address
 576         * This will include the IEEE address token on links that support it.
 577         */
 578
 579        word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
 580        word ^= (word >> 16);
 581        word ^= (word >> 8);
 582
 583        return ((word ^ (word >> 4)) & 0x0f);
 584}
 585
 586/* On success it returns ifp with increased reference count */
 587
 588static struct inet6_ifaddr *
 589ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 590              int scope, u32 flags)
 591{
 592        struct inet6_ifaddr *ifa = NULL;
 593        struct rt6_info *rt;
 594        struct net *net = dev_net(idev->dev);
 595        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 || net->ipv6.devconf_all->disable_ipv6) {
 612                err = -EACCES;
 613                goto out2;
 614        }
 615
 616        write_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, 0);
 634        if (IS_ERR(rt)) {
 635                err = PTR_ERR(rt);
 636                goto out;
 637        }
 638
 639        ipv6_addr_copy(&ifa->addr, addr);
 640
 641        spin_lock_init(&ifa->lock);
 642        init_timer(&ifa->timer);
 643        ifa->timer.data = (unsigned long) ifa;
 644        ifa->scope = scope;
 645        ifa->prefix_len = pfxlen;
 646        ifa->flags = flags | IFA_F_TENTATIVE;
 647        ifa->cstamp = ifa->tstamp = jiffies;
 648
 649        ifa->rt = rt;
 650
 651        /*
 652         * part one of RFC 4429, section 3.3
 653         * We should not configure an address as
 654         * optimistic if we do not yet know the link
 655         * layer address of our nexhop router
 656         */
 657
 658        if (rt->rt6i_nexthop == NULL)
 659                ifa->flags &= ~IFA_F_OPTIMISTIC;
 660
 661        ifa->idev = idev;
 662        in6_dev_hold(idev);
 663        /* For caller */
 664        in6_ifa_hold(ifa);
 665
 666        /* Add to big hash table */
 667        hash = ipv6_addr_hash(addr);
 668
 669        ifa->lst_next = inet6_addr_lst[hash];
 670        inet6_addr_lst[hash] = ifa;
 671        in6_ifa_hold(ifa);
 672        write_unlock(&addrconf_hash_lock);
 673
 674        write_lock(&idev->lock);
 675        /* Add to inet6_dev unicast addr list. */
 676        ipv6_link_dev_addr(idev, ifa);
 677
 678#ifdef CONFIG_IPV6_PRIVACY
 679        if (ifa->flags&IFA_F_TEMPORARY) {
 680                ifa->tmp_next = idev->tempaddr_list;
 681                idev->tempaddr_list = ifa;
 682                in6_ifa_hold(ifa);
 683        }
 684#endif
 685
 686        in6_ifa_hold(ifa);
 687        write_unlock(&idev->lock);
 688out2:
 689        rcu_read_unlock_bh();
 690
 691        if (likely(err == 0))
 692                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 693        else {
 694                kfree(ifa);
 695                ifa = ERR_PTR(err);
 696        }
 697
 698        return ifa;
 699out:
 700        write_unlock(&addrconf_hash_lock);
 701        goto out2;
 702}
 703
 704/* This function wants to get referenced ifp and releases it before return */
 705
 706static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 707{
 708        struct inet6_ifaddr *ifa, **ifap;
 709        struct inet6_dev *idev = ifp->idev;
 710        int hash;
 711        int deleted = 0, onlink = 0;
 712        unsigned long expires = jiffies;
 713
 714        hash = ipv6_addr_hash(&ifp->addr);
 715
 716        ifp->dead = 1;
 717
 718        write_lock_bh(&addrconf_hash_lock);
 719        for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 720             ifap = &ifa->lst_next) {
 721                if (ifa == ifp) {
 722                        *ifap = ifa->lst_next;
 723                        __in6_ifa_put(ifp);
 724                        ifa->lst_next = NULL;
 725                        break;
 726                }
 727        }
 728        write_unlock_bh(&addrconf_hash_lock);
 729
 730        write_lock_bh(&idev->lock);
 731#ifdef CONFIG_IPV6_PRIVACY
 732        if (ifp->flags&IFA_F_TEMPORARY) {
 733                for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 734                     ifap = &ifa->tmp_next) {
 735                        if (ifa == ifp) {
 736                                *ifap = ifa->tmp_next;
 737                                if (ifp->ifpub) {
 738                                        in6_ifa_put(ifp->ifpub);
 739                                        ifp->ifpub = NULL;
 740                                }
 741                                __in6_ifa_put(ifp);
 742                                ifa->tmp_next = NULL;
 743                                break;
 744                        }
 745                }
 746        }
 747#endif
 748
 749        for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 750                if (ifa == ifp) {
 751                        *ifap = ifa->if_next;
 752                        __in6_ifa_put(ifp);
 753                        ifa->if_next = NULL;
 754                        if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 755                                break;
 756                        deleted = 1;
 757                        continue;
 758                } else if (ifp->flags & IFA_F_PERMANENT) {
 759                        if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 760                                              ifp->prefix_len)) {
 761                                if (ifa->flags & IFA_F_PERMANENT) {
 762                                        onlink = 1;
 763                                        if (deleted)
 764                                                break;
 765                                } else {
 766                                        unsigned long lifetime;
 767
 768                                        if (!onlink)
 769                                                onlink = -1;
 770
 771                                        spin_lock(&ifa->lock);
 772
 773                                        lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 774                                        /*
 775                                         * Note: Because this address is
 776                                         * not permanent, lifetime <
 777                                         * LONG_MAX / HZ here.
 778                                         */
 779                                        if (time_before(expires,
 780                                                        ifa->tstamp + lifetime * HZ))
 781                                                expires = ifa->tstamp + lifetime * HZ;
 782                                        spin_unlock(&ifa->lock);
 783                                }
 784                        }
 785                }
 786                ifap = &ifa->if_next;
 787        }
 788        write_unlock_bh(&idev->lock);
 789
 790        addrconf_del_timer(ifp);
 791
 792        ipv6_ifa_notify(RTM_DELADDR, ifp);
 793
 794        atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 795
 796        /*
 797         * Purge or update corresponding prefix
 798         *
 799         * 1) we don't purge prefix here if address was not permanent.
 800         *    prefix is managed by its own lifetime.
 801         * 2) if there're no addresses, delete prefix.
 802         * 3) if there're still other permanent address(es),
 803         *    corresponding prefix is still permanent.
 804         * 4) otherwise, update prefix lifetime to the
 805         *    longest valid lifetime among the corresponding
 806         *    addresses on the device.
 807         *    Note: subsequent RA will update lifetime.
 808         *
 809         * --yoshfuji
 810         */
 811        if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 812                struct in6_addr prefix;
 813                struct rt6_info *rt;
 814                struct net *net = dev_net(ifp->idev->dev);
 815                ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 816                rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 817
 818                if (rt && addrconf_is_prefix_route(rt)) {
 819                        if (onlink == 0) {
 820                                ip6_del_rt(rt);
 821                                rt = NULL;
 822                        } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 823                                rt->rt6i_expires = expires;
 824                                rt->rt6i_flags |= RTF_EXPIRES;
 825                        }
 826                }
 827                dst_release(&rt->u.dst);
 828        }
 829
 830        in6_ifa_put(ifp);
 831}
 832
 833#ifdef CONFIG_IPV6_PRIVACY
 834static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 835{
 836        struct inet6_dev *idev = ifp->idev;
 837        struct in6_addr addr, *tmpaddr;
 838        unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 839        unsigned long regen_advance;
 840        int tmp_plen;
 841        int ret = 0;
 842        int max_addresses;
 843        u32 addr_flags;
 844
 845        write_lock(&idev->lock);
 846        if (ift) {
 847                spin_lock_bh(&ift->lock);
 848                memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 849                spin_unlock_bh(&ift->lock);
 850                tmpaddr = &addr;
 851        } else {
 852                tmpaddr = NULL;
 853        }
 854retry:
 855        in6_dev_hold(idev);
 856        if (idev->cnf.use_tempaddr <= 0) {
 857                write_unlock(&idev->lock);
 858                printk(KERN_INFO
 859                        "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 860                in6_dev_put(idev);
 861                ret = -1;
 862                goto out;
 863        }
 864        spin_lock_bh(&ifp->lock);
 865        if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 866                idev->cnf.use_tempaddr = -1;    /*XXX*/
 867                spin_unlock_bh(&ifp->lock);
 868                write_unlock(&idev->lock);
 869                printk(KERN_WARNING
 870                        "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 871                in6_dev_put(idev);
 872                ret = -1;
 873                goto out;
 874        }
 875        in6_ifa_hold(ifp);
 876        memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 877        if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 878                spin_unlock_bh(&ifp->lock);
 879                write_unlock(&idev->lock);
 880                printk(KERN_WARNING
 881                        "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 882                in6_ifa_put(ifp);
 883                in6_dev_put(idev);
 884                ret = -1;
 885                goto out;
 886        }
 887        memcpy(&addr.s6_addr[8], idev->rndid, 8);
 888        tmp_valid_lft = min_t(__u32,
 889                              ifp->valid_lft,
 890                              idev->cnf.temp_valid_lft);
 891        tmp_prefered_lft = min_t(__u32,
 892                                 ifp->prefered_lft,
 893                                 idev->cnf.temp_prefered_lft - desync_factor / HZ);
 894        tmp_plen = ifp->prefix_len;
 895        max_addresses = idev->cnf.max_addresses;
 896        tmp_cstamp = ifp->cstamp;
 897        tmp_tstamp = ifp->tstamp;
 898        spin_unlock_bh(&ifp->lock);
 899
 900        regen_advance = idev->cnf.regen_max_retry *
 901                        idev->cnf.dad_transmits *
 902                        idev->nd_parms->retrans_time / HZ;
 903        write_unlock(&idev->lock);
 904
 905        /* A temporary address is created only if this calculated Preferred
 906         * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 907         * an implementation must not create a temporary address with a zero
 908         * Preferred Lifetime.
 909         */
 910        if (tmp_prefered_lft <= regen_advance) {
 911                in6_ifa_put(ifp);
 912                in6_dev_put(idev);
 913                ret = -1;
 914                goto out;
 915        }
 916
 917        addr_flags = IFA_F_TEMPORARY;
 918        /* set in addrconf_prefix_rcv() */
 919        if (ifp->flags & IFA_F_OPTIMISTIC)
 920                addr_flags |= IFA_F_OPTIMISTIC;
 921
 922        ift = !max_addresses ||
 923              ipv6_count_addresses(idev) < max_addresses ?
 924                ipv6_add_addr(idev, &addr, tmp_plen,
 925                              ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 926                              addr_flags) : NULL;
 927        if (!ift || IS_ERR(ift)) {
 928                in6_ifa_put(ifp);
 929                in6_dev_put(idev);
 930                printk(KERN_INFO
 931                        "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 932                tmpaddr = &addr;
 933                write_lock(&idev->lock);
 934                goto retry;
 935        }
 936
 937        spin_lock_bh(&ift->lock);
 938        ift->ifpub = ifp;
 939        ift->valid_lft = tmp_valid_lft;
 940        ift->prefered_lft = tmp_prefered_lft;
 941        ift->cstamp = tmp_cstamp;
 942        ift->tstamp = tmp_tstamp;
 943        spin_unlock_bh(&ift->lock);
 944
 945        addrconf_dad_start(ift, 0);
 946        in6_ifa_put(ift);
 947        in6_dev_put(idev);
 948out:
 949        return ret;
 950}
 951#endif
 952
 953/*
 954 *      Choose an appropriate source address (RFC3484)
 955 */
 956enum {
 957        IPV6_SADDR_RULE_INIT = 0,
 958        IPV6_SADDR_RULE_LOCAL,
 959        IPV6_SADDR_RULE_SCOPE,
 960        IPV6_SADDR_RULE_PREFERRED,
 961#ifdef CONFIG_IPV6_MIP6
 962        IPV6_SADDR_RULE_HOA,
 963#endif
 964        IPV6_SADDR_RULE_OIF,
 965        IPV6_SADDR_RULE_LABEL,
 966#ifdef CONFIG_IPV6_PRIVACY
 967        IPV6_SADDR_RULE_PRIVACY,
 968#endif
 969        IPV6_SADDR_RULE_ORCHID,
 970        IPV6_SADDR_RULE_PREFIX,
 971        IPV6_SADDR_RULE_MAX
 972};
 973
 974struct ipv6_saddr_score {
 975        int                     rule;
 976        int                     addr_type;
 977        struct inet6_ifaddr     *ifa;
 978        DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 979        int                     scopedist;
 980        int                     matchlen;
 981};
 982
 983struct ipv6_saddr_dst {
 984        const struct in6_addr *addr;
 985        int ifindex;
 986        int scope;
 987        int label;
 988        unsigned int prefs;
 989};
 990
 991static inline int ipv6_saddr_preferred(int type)
 992{
 993        if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 994                    IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 995                return 1;
 996        return 0;
 997}
 998
 999static int ipv6_get_saddr_eval(struct net *net,
1000                               struct ipv6_saddr_score *score,
1001                               struct ipv6_saddr_dst *dst,
1002                               int i)
1003{
1004        int ret;
1005
1006        if (i <= score->rule) {
1007                switch (i) {
1008                case IPV6_SADDR_RULE_SCOPE:
1009                        ret = score->scopedist;
1010                        break;
1011                case IPV6_SADDR_RULE_PREFIX:
1012                        ret = score->matchlen;
1013                        break;
1014                default:
1015                        ret = !!test_bit(i, score->scorebits);
1016                }
1017                goto out;
1018        }
1019
1020        switch (i) {
1021        case IPV6_SADDR_RULE_INIT:
1022                /* Rule 0: remember if hiscore is not ready yet */
1023                ret = !!score->ifa;
1024                break;
1025        case IPV6_SADDR_RULE_LOCAL:
1026                /* Rule 1: Prefer same address */
1027                ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1028                break;
1029        case IPV6_SADDR_RULE_SCOPE:
1030                /* Rule 2: Prefer appropriate scope
1031                 *
1032                 *      ret
1033                 *       ^
1034                 *    -1 |  d 15
1035                 *    ---+--+-+---> scope
1036                 *       |
1037                 *       |             d is scope of the destination.
1038                 *  B-d  |  \
1039                 *       |   \      <- smaller scope is better if
1040                 *  B-15 |    \        if scope is enough for destinaion.
1041                 *       |             ret = B - scope (-1 <= scope >= d <= 15).
1042                 * d-C-1 | /
1043                 *       |/         <- greater is better
1044                 *   -C  /             if scope is not enough for destination.
1045                 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1046                 *
1047                 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1048                 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1049                 * Assume B = 0 and we get C > 29.
1050                 */
1051                ret = __ipv6_addr_src_scope(score->addr_type);
1052                if (ret >= dst->scope)
1053                        ret = -ret;
1054                else
1055                        ret -= 128;     /* 30 is enough */
1056                score->scopedist = ret;
1057                break;
1058        case IPV6_SADDR_RULE_PREFERRED:
1059                /* Rule 3: Avoid deprecated and optimistic addresses */
1060                ret = ipv6_saddr_preferred(score->addr_type) ||
1061                      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1062                break;
1063#ifdef CONFIG_IPV6_MIP6
1064        case IPV6_SADDR_RULE_HOA:
1065            {
1066                /* Rule 4: Prefer home address */
1067                int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1068                ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1069                break;
1070            }
1071#endif
1072        case IPV6_SADDR_RULE_OIF:
1073                /* Rule 5: Prefer outgoing interface */
1074                ret = (!dst->ifindex ||
1075                       dst->ifindex == score->ifa->idev->dev->ifindex);
1076                break;
1077        case IPV6_SADDR_RULE_LABEL:
1078                /* Rule 6: Prefer matching label */
1079                ret = ipv6_addr_label(net,
1080                                      &score->ifa->addr, score->addr_type,
1081                                      score->ifa->idev->dev->ifindex) == dst->label;
1082                break;
1083#ifdef CONFIG_IPV6_PRIVACY
1084        case IPV6_SADDR_RULE_PRIVACY:
1085            {
1086                /* Rule 7: Prefer public address
1087                 * Note: prefer temprary address if use_tempaddr >= 2
1088                 */
1089                int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1090                                !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1091                                score->ifa->idev->cnf.use_tempaddr >= 2;
1092                ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1093                break;
1094            }
1095#endif
1096        case IPV6_SADDR_RULE_ORCHID:
1097                /* Rule 8-: Prefer ORCHID vs ORCHID or
1098                 *          non-ORCHID vs non-ORCHID
1099                 */
1100                ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1101                        ipv6_addr_orchid(dst->addr));
1102                break;
1103        case IPV6_SADDR_RULE_PREFIX:
1104                /* Rule 8: Use longest matching prefix */
1105                score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1106                                                       dst->addr);
1107                break;
1108        default:
1109                ret = 0;
1110        }
1111
1112        if (ret)
1113                __set_bit(i, score->scorebits);
1114        score->rule = i;
1115out:
1116        return ret;
1117}
1118
1119int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1120                       const struct in6_addr *daddr, unsigned int prefs,
1121                       struct in6_addr *saddr)
1122{
1123        struct ipv6_saddr_score scores[2],
1124                                *score = &scores[0], *hiscore = &scores[1];
1125        struct ipv6_saddr_dst dst;
1126        struct net_device *dev;
1127        int dst_type;
1128
1129        dst_type = __ipv6_addr_type(daddr);
1130        dst.addr = daddr;
1131        dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1132        dst.scope = __ipv6_addr_src_scope(dst_type);
1133        dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1134        dst.prefs = prefs;
1135
1136        hiscore->rule = -1;
1137        hiscore->ifa = NULL;
1138
1139        read_lock(&dev_base_lock);
1140        rcu_read_lock();
1141
1142        for_each_netdev(net, dev) {
1143                struct inet6_dev *idev;
1144
1145                /* Candidate Source Address (section 4)
1146                 *  - multicast and link-local destination address,
1147                 *    the set of candidate source address MUST only
1148                 *    include addresses assigned to interfaces
1149                 *    belonging to the same link as the outgoing
1150                 *    interface.
1151                 * (- For site-local destination addresses, the
1152                 *    set of candidate source addresses MUST only
1153                 *    include addresses assigned to interfaces
1154                 *    belonging to the same site as the outgoing
1155                 *    interface.)
1156                 */
1157                if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159                    dst.ifindex && dev->ifindex != dst.ifindex)
1160                        continue;
1161
1162                idev = __in6_dev_get(dev);
1163                if (!idev)
1164                        continue;
1165
1166                read_lock_bh(&idev->lock);
1167                for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1168                        int i;
1169
1170                        /*
1171                         * - Tentative Address (RFC2462 section 5.4)
1172                         *  - A tentative address is not considered
1173                         *    "assigned to an interface" in the traditional
1174                         *    sense, unless it is also flagged as optimistic.
1175                         * - Candidate Source Address (section 4)
1176                         *  - In any case, anycast addresses, multicast
1177                         *    addresses, and the unspecified address MUST
1178                         *    NOT be included in a candidate set.
1179                         */
1180                        if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181                            (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1182                                continue;
1183
1184                        score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186                        if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187                                     score->addr_type & IPV6_ADDR_MULTICAST)) {
1188                                LIMIT_NETDEBUG(KERN_DEBUG
1189                                               "ADDRCONF: unspecified / multicast address "
1190                                               "assigned as unicast address on %s",
1191                                               dev->name);
1192                                continue;
1193                        }
1194
1195                        score->rule = -1;
1196                        bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198                        for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199                                int minihiscore, miniscore;
1200
1201                                minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202                                miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1203
1204                                if (minihiscore > miniscore) {
1205                                        if (i == IPV6_SADDR_RULE_SCOPE &&
1206                                            score->scopedist > 0) {
1207                                                /*
1208                                                 * special case:
1209                                                 * each remaining entry
1210                                                 * has too small (not enough)
1211                                                 * scope, because ifa entries
1212                                                 * are sorted by their scope
1213                                                 * values.
1214                                                 */
1215                                                goto try_nextdev;
1216                                        }
1217                                        break;
1218                                } else if (minihiscore < miniscore) {
1219                                        if (hiscore->ifa)
1220                                                in6_ifa_put(hiscore->ifa);
1221
1222                                        in6_ifa_hold(score->ifa);
1223
1224                                        swap(hiscore, score);
1225
1226                                        /* restore our iterator */
1227                                        score->ifa = hiscore->ifa;
1228
1229                                        break;
1230                                }
1231                        }
1232                }
1233try_nextdev:
1234                read_unlock_bh(&idev->lock);
1235        }
1236        rcu_read_unlock();
1237        read_unlock(&dev_base_lock);
1238
1239        if (!hiscore->ifa)
1240                return -EADDRNOTAVAIL;
1241
1242        ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1243        in6_ifa_put(hiscore->ifa);
1244        return 0;
1245}
1246
1247EXPORT_SYMBOL(ipv6_dev_get_saddr);
1248
1249int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1250                    unsigned char banned_flags)
1251{
1252        struct inet6_dev *idev;
1253        int err = -EADDRNOTAVAIL;
1254
1255        rcu_read_lock();
1256        if ((idev = __in6_dev_get(dev)) != NULL) {
1257                struct inet6_ifaddr *ifp;
1258
1259                read_lock_bh(&idev->lock);
1260                for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1261                        if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1262                                ipv6_addr_copy(addr, &ifp->addr);
1263                                err = 0;
1264                                break;
1265                        }
1266                }
1267                read_unlock_bh(&idev->lock);
1268        }
1269        rcu_read_unlock();
1270        return err;
1271}
1272
1273static int ipv6_count_addresses(struct inet6_dev *idev)
1274{
1275        int cnt = 0;
1276        struct inet6_ifaddr *ifp;
1277
1278        read_lock_bh(&idev->lock);
1279        for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1280                cnt++;
1281        read_unlock_bh(&idev->lock);
1282        return cnt;
1283}
1284
1285int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286                  struct net_device *dev, int strict)
1287{
1288        struct inet6_ifaddr * ifp;
1289        u8 hash = ipv6_addr_hash(addr);
1290
1291        read_lock_bh(&addrconf_hash_lock);
1292        for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1293                if (!net_eq(dev_net(ifp->idev->dev), net))
1294                        continue;
1295                if (ipv6_addr_equal(&ifp->addr, addr) &&
1296                    !(ifp->flags&IFA_F_TENTATIVE)) {
1297                        if (dev == NULL || ifp->idev->dev == dev ||
1298                            !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1299                                break;
1300                }
1301        }
1302        read_unlock_bh(&addrconf_hash_lock);
1303        return ifp != NULL;
1304}
1305EXPORT_SYMBOL(ipv6_chk_addr);
1306
1307static
1308int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309                       struct net_device *dev)
1310{
1311        struct inet6_ifaddr * ifp;
1312        u8 hash = ipv6_addr_hash(addr);
1313
1314        for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1315                if (!net_eq(dev_net(ifp->idev->dev), net))
1316                        continue;
1317                if (ipv6_addr_equal(&ifp->addr, addr)) {
1318                        if (dev == NULL || ifp->idev->dev == dev)
1319                                break;
1320                }
1321        }
1322        return ifp != NULL;
1323}
1324
1325int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1326{
1327        struct inet6_dev *idev;
1328        struct inet6_ifaddr *ifa;
1329        int     onlink;
1330
1331        onlink = 0;
1332        rcu_read_lock();
1333        idev = __in6_dev_get(dev);
1334        if (idev) {
1335                read_lock_bh(&idev->lock);
1336                for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1337                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
1338                                                   ifa->prefix_len);
1339                        if (onlink)
1340                                break;
1341                }
1342                read_unlock_bh(&idev->lock);
1343        }
1344        rcu_read_unlock();
1345        return onlink;
1346}
1347
1348EXPORT_SYMBOL(ipv6_chk_prefix);
1349
1350struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1351                                     struct net_device *dev, int strict)
1352{
1353        struct inet6_ifaddr * ifp;
1354        u8 hash = ipv6_addr_hash(addr);
1355
1356        read_lock_bh(&addrconf_hash_lock);
1357        for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1358                if (!net_eq(dev_net(ifp->idev->dev), net))
1359                        continue;
1360                if (ipv6_addr_equal(&ifp->addr, addr)) {
1361                        if (dev == NULL || ifp->idev->dev == dev ||
1362                            !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1363                                in6_ifa_hold(ifp);
1364                                break;
1365                        }
1366                }
1367        }
1368        read_unlock_bh(&addrconf_hash_lock);
1369
1370        return ifp;
1371}
1372
1373/* Gets referenced address, destroys ifaddr */
1374
1375static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1376{
1377        if (ifp->flags&IFA_F_PERMANENT) {
1378                spin_lock_bh(&ifp->lock);
1379                addrconf_del_timer(ifp);
1380                ifp->flags |= IFA_F_TENTATIVE;
1381                spin_unlock_bh(&ifp->lock);
1382                in6_ifa_put(ifp);
1383#ifdef CONFIG_IPV6_PRIVACY
1384        } else if (ifp->flags&IFA_F_TEMPORARY) {
1385                struct inet6_ifaddr *ifpub;
1386                spin_lock_bh(&ifp->lock);
1387                ifpub = ifp->ifpub;
1388                if (ifpub) {
1389                        in6_ifa_hold(ifpub);
1390                        spin_unlock_bh(&ifp->lock);
1391                        ipv6_create_tempaddr(ifpub, ifp);
1392                        in6_ifa_put(ifpub);
1393                } else {
1394                        spin_unlock_bh(&ifp->lock);
1395                }
1396                ipv6_del_addr(ifp);
1397#endif
1398        } else
1399                ipv6_del_addr(ifp);
1400}
1401
1402void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1403{
1404        struct inet6_dev *idev = ifp->idev;
1405
1406        if (net_ratelimit())
1407                printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
1408                        ifp->idev->dev->name);
1409
1410        if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1411                struct in6_addr addr;
1412
1413                addr.s6_addr32[0] = htonl(0xfe800000);
1414                addr.s6_addr32[1] = 0;
1415
1416                if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1417                    ipv6_addr_equal(&ifp->addr, &addr)) {
1418                        /* DAD failed for link-local based on MAC address */
1419                        idev->cnf.disable_ipv6 = 1;
1420
1421                        printk(KERN_INFO "%s: IPv6 being disabled!\n",
1422                                ifp->idev->dev->name);
1423                }
1424        }
1425
1426        addrconf_dad_stop(ifp);
1427}
1428
1429/* Join to solicited addr multicast group. */
1430
1431void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1432{
1433        struct in6_addr maddr;
1434
1435        if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1436                return;
1437
1438        addrconf_addr_solict_mult(addr, &maddr);
1439        ipv6_dev_mc_inc(dev, &maddr);
1440}
1441
1442void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1443{
1444        struct in6_addr maddr;
1445
1446        if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1447                return;
1448
1449        addrconf_addr_solict_mult(addr, &maddr);
1450        __ipv6_dev_mc_dec(idev, &maddr);
1451}
1452
1453static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1454{
1455        struct in6_addr addr;
1456        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1457        if (ipv6_addr_any(&addr))
1458                return;
1459        ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1460}
1461
1462static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1463{
1464        struct in6_addr addr;
1465        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1466        if (ipv6_addr_any(&addr))
1467                return;
1468        __ipv6_dev_ac_dec(ifp->idev, &addr);
1469}
1470
1471static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1472{
1473        if (dev->addr_len != ETH_ALEN)
1474                return -1;
1475        memcpy(eui, dev->dev_addr, 3);
1476        memcpy(eui + 5, dev->dev_addr + 3, 3);
1477
1478        /*
1479         * The zSeries OSA network cards can be shared among various
1480         * OS instances, but the OSA cards have only one MAC address.
1481         * This leads to duplicate address conflicts in conjunction
1482         * with IPv6 if more than one instance uses the same card.
1483         *
1484         * The driver for these cards can deliver a unique 16-bit
1485         * identifier for each instance sharing the same card.  It is
1486         * placed instead of 0xFFFE in the interface identifier.  The
1487         * "u" bit of the interface identifier is not inverted in this
1488         * case.  Hence the resulting interface identifier has local
1489         * scope according to RFC2373.
1490         */
1491        if (dev->dev_id) {
1492                eui[3] = (dev->dev_id >> 8) & 0xFF;
1493                eui[4] = dev->dev_id & 0xFF;
1494        } else {
1495                eui[3] = 0xFF;
1496                eui[4] = 0xFE;
1497                eui[0] ^= 2;
1498        }
1499        return 0;
1500}
1501
1502static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1503{
1504        /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1505        if (dev->addr_len != ARCNET_ALEN)
1506                return -1;
1507        memset(eui, 0, 7);
1508        eui[7] = *(u8*)dev->dev_addr;
1509        return 0;
1510}
1511
1512static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1513{
1514        if (dev->addr_len != INFINIBAND_ALEN)
1515                return -1;
1516        memcpy(eui, dev->dev_addr + 12, 8);
1517        eui[0] |= 2;
1518        return 0;
1519}
1520
1521int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1522{
1523        eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1524                  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1525                  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1526                  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1527                  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1528                  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1529        eui[1] = 0;
1530        eui[2] = 0x5E;
1531        eui[3] = 0xFE;
1532        memcpy(eui + 4, &addr, 4);
1533        return 0;
1534}
1535EXPORT_SYMBOL(__ipv6_isatap_ifid);
1536
1537static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1538{
1539        if (dev->priv_flags & IFF_ISATAP)
1540                return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1541        return -1;
1542}
1543
1544static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1545{
1546        switch (dev->type) {
1547        case ARPHRD_ETHER:
1548        case ARPHRD_FDDI:
1549        case ARPHRD_IEEE802_TR:
1550                return addrconf_ifid_eui48(eui, dev);
1551        case ARPHRD_ARCNET:
1552                return addrconf_ifid_arcnet(eui, dev);
1553        case ARPHRD_INFINIBAND:
1554                return addrconf_ifid_infiniband(eui, dev);
1555        case ARPHRD_SIT:
1556                return addrconf_ifid_sit(eui, dev);
1557        }
1558        return -1;
1559}
1560
1561static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1562{
1563        int err = -1;
1564        struct inet6_ifaddr *ifp;
1565
1566        read_lock_bh(&idev->lock);
1567        for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1568                if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1569                        memcpy(eui, ifp->addr.s6_addr+8, 8);
1570                        err = 0;
1571                        break;
1572                }
1573        }
1574        read_unlock_bh(&idev->lock);
1575        return err;
1576}
1577
1578#ifdef CONFIG_IPV6_PRIVACY
1579/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1580static int __ipv6_regen_rndid(struct inet6_dev *idev)
1581{
1582regen:
1583        get_random_bytes(idev->rndid, sizeof(idev->rndid));
1584        idev->rndid[0] &= ~0x02;
1585
1586        /*
1587         * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1588         * check if generated address is not inappropriate
1589         *
1590         *  - Reserved subnet anycast (RFC 2526)
1591         *      11111101 11....11 1xxxxxxx
1592         *  - ISATAP (RFC4214) 6.1
1593         *      00-00-5E-FE-xx-xx-xx-xx
1594         *  - value 0
1595         *  - XXX: already assigned to an address on the device
1596         */
1597        if (idev->rndid[0] == 0xfd &&
1598            (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1599            (idev->rndid[7]&0x80))
1600                goto regen;
1601        if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1602                if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1603                        goto regen;
1604                if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1605                        goto regen;
1606        }
1607
1608        return 0;
1609}
1610
1611static void ipv6_regen_rndid(unsigned long data)
1612{
1613        struct inet6_dev *idev = (struct inet6_dev *) data;
1614        unsigned long expires;
1615
1616        rcu_read_lock_bh();
1617        write_lock_bh(&idev->lock);
1618
1619        if (idev->dead)
1620                goto out;
1621
1622        if (__ipv6_regen_rndid(idev) < 0)
1623                goto out;
1624
1625        expires = jiffies +
1626                idev->cnf.temp_prefered_lft * HZ -
1627                idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1628        if (time_before(expires, jiffies)) {
1629                printk(KERN_WARNING
1630                        "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1631                        idev->dev->name);
1632                goto out;
1633        }
1634
1635        if (!mod_timer(&idev->regen_timer, expires))
1636                in6_dev_hold(idev);
1637
1638out:
1639        write_unlock_bh(&idev->lock);
1640        rcu_read_unlock_bh();
1641        in6_dev_put(idev);
1642}
1643
1644static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1645        int ret = 0;
1646
1647        if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1648                ret = __ipv6_regen_rndid(idev);
1649        return ret;
1650}
1651#endif
1652
1653/*
1654 *      Add prefix route.
1655 */
1656
1657static void
1658addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1659                      unsigned long expires, u32 flags)
1660{
1661        struct fib6_config cfg = {
1662                .fc_table = RT6_TABLE_PREFIX,
1663                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1664                .fc_ifindex = dev->ifindex,
1665                .fc_expires = expires,
1666                .fc_dst_len = plen,
1667                .fc_flags = RTF_UP | flags,
1668                .fc_nlinfo.nl_net = dev_net(dev),
1669                .fc_protocol = RTPROT_KERNEL,
1670        };
1671
1672        ipv6_addr_copy(&cfg.fc_dst, pfx);
1673
1674        /* Prevent useless cloning on PtP SIT.
1675           This thing is done here expecting that the whole
1676           class of non-broadcast devices need not cloning.
1677         */
1678#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1679        if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1680                cfg.fc_flags |= RTF_NONEXTHOP;
1681#endif
1682
1683        ip6_route_add(&cfg);
1684}
1685
1686/* Create "default" multicast route to the interface */
1687
1688static void addrconf_add_mroute(struct net_device *dev)
1689{
1690        struct fib6_config cfg = {
1691                .fc_table = RT6_TABLE_LOCAL,
1692                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1693                .fc_ifindex = dev->ifindex,
1694                .fc_dst_len = 8,
1695                .fc_flags = RTF_UP,
1696                .fc_nlinfo.nl_net = dev_net(dev),
1697        };
1698
1699        ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1700
1701        ip6_route_add(&cfg);
1702}
1703
1704#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1705static void sit_route_add(struct net_device *dev)
1706{
1707        struct fib6_config cfg = {
1708                .fc_table = RT6_TABLE_MAIN,
1709                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1710                .fc_ifindex = dev->ifindex,
1711                .fc_dst_len = 96,
1712                .fc_flags = RTF_UP | RTF_NONEXTHOP,
1713                .fc_nlinfo.nl_net = dev_net(dev),
1714        };
1715
1716        /* prefix length - 96 bits "::d.d.d.d" */
1717        ip6_route_add(&cfg);
1718}
1719#endif
1720
1721static void addrconf_add_lroute(struct net_device *dev)
1722{
1723        struct in6_addr addr;
1724
1725        ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1726        addrconf_prefix_route(&addr, 64, dev, 0, 0);
1727}
1728
1729static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1730{
1731        struct inet6_dev *idev;
1732
1733        ASSERT_RTNL();
1734
1735        if ((idev = ipv6_find_idev(dev)) == NULL)
1736                return NULL;
1737
1738        /* Add default multicast route */
1739        addrconf_add_mroute(dev);
1740
1741        /* Add link local route */
1742        addrconf_add_lroute(dev);
1743        return idev;
1744}
1745
1746void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1747{
1748        struct prefix_info *pinfo;
1749        __u32 valid_lft;
1750        __u32 prefered_lft;
1751        int addr_type;
1752        struct inet6_dev *in6_dev;
1753
1754        pinfo = (struct prefix_info *) opt;
1755
1756        if (len < sizeof(struct prefix_info)) {
1757                ADBG(("addrconf: prefix option too short\n"));
1758                return;
1759        }
1760
1761        /*
1762         *      Validation checks ([ADDRCONF], page 19)
1763         */
1764
1765        addr_type = ipv6_addr_type(&pinfo->prefix);
1766
1767        if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1768                return;
1769
1770        valid_lft = ntohl(pinfo->valid);
1771        prefered_lft = ntohl(pinfo->prefered);
1772
1773        if (prefered_lft > valid_lft) {
1774                if (net_ratelimit())
1775                        printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1776                return;
1777        }
1778
1779        in6_dev = in6_dev_get(dev);
1780
1781        if (in6_dev == NULL) {
1782                if (net_ratelimit())
1783                        printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1784                return;
1785        }
1786
1787        /*
1788         *      Two things going on here:
1789         *      1) Add routes for on-link prefixes
1790         *      2) Configure prefixes with the auto flag set
1791         */
1792
1793        if (pinfo->onlink) {
1794                struct rt6_info *rt;
1795                unsigned long rt_expires;
1796
1797                /* Avoid arithmetic overflow. Really, we could
1798                 * save rt_expires in seconds, likely valid_lft,
1799                 * but it would require division in fib gc, that it
1800                 * not good.
1801                 */
1802                if (HZ > USER_HZ)
1803                        rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1804                else
1805                        rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1806
1807                if (addrconf_finite_timeout(rt_expires))
1808                        rt_expires *= HZ;
1809
1810                rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1811                                dev->ifindex, 1);
1812
1813                if (rt && addrconf_is_prefix_route(rt)) {
1814                        /* Autoconf prefix route */
1815                        if (valid_lft == 0) {
1816                                ip6_del_rt(rt);
1817                                rt = NULL;
1818                        } else if (addrconf_finite_timeout(rt_expires)) {
1819                                /* not infinity */
1820                                rt->rt6i_expires = jiffies + rt_expires;
1821                                rt->rt6i_flags |= RTF_EXPIRES;
1822                        } else {
1823                                rt->rt6i_flags &= ~RTF_EXPIRES;
1824                                rt->rt6i_expires = 0;
1825                        }
1826                } else if (valid_lft) {
1827                        clock_t expires = 0;
1828                        int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1829                        if (addrconf_finite_timeout(rt_expires)) {
1830                                /* not infinity */
1831                                flags |= RTF_EXPIRES;
1832                                expires = jiffies_to_clock_t(rt_expires);
1833                        }
1834                        addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1835                                              dev, expires, flags);
1836                }
1837                if (rt)
1838                        dst_release(&rt->u.dst);
1839        }
1840
1841        /* Try to figure out our local address for this prefix */
1842
1843        if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1844                struct inet6_ifaddr * ifp;
1845                struct in6_addr addr;
1846                int create = 0, update_lft = 0;
1847                struct net *net = dev_net(dev);
1848
1849                if (pinfo->prefix_len == 64) {
1850                        memcpy(&addr, &pinfo->prefix, 8);
1851                        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1852                            ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1853                                in6_dev_put(in6_dev);
1854                                return;
1855                        }
1856                        goto ok;
1857                }
1858                if (net_ratelimit())
1859                        printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1860                               pinfo->prefix_len);
1861                in6_dev_put(in6_dev);
1862                return;
1863
1864ok:
1865
1866                ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1867
1868                if (ifp == NULL && valid_lft) {
1869                        int max_addresses = in6_dev->cnf.max_addresses;
1870                        u32 addr_flags = 0;
1871
1872#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1873                        if (in6_dev->cnf.optimistic_dad &&
1874                            !net->ipv6.devconf_all->forwarding)
1875                                addr_flags = IFA_F_OPTIMISTIC;
1876#endif
1877
1878                        /* Do not allow to create too much of autoconfigured
1879                         * addresses; this would be too easy way to crash kernel.
1880                         */
1881                        if (!max_addresses ||
1882                            ipv6_count_addresses(in6_dev) < max_addresses)
1883                                ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1884                                                    addr_type&IPV6_ADDR_SCOPE_MASK,
1885                                                    addr_flags);
1886
1887                        if (!ifp || IS_ERR(ifp)) {
1888                                in6_dev_put(in6_dev);
1889                                return;
1890                        }
1891
1892                        update_lft = create = 1;
1893                        ifp->cstamp = jiffies;
1894                        addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1895                }
1896
1897                if (ifp) {
1898                        int flags;
1899                        unsigned long now;
1900#ifdef CONFIG_IPV6_PRIVACY
1901                        struct inet6_ifaddr *ift;
1902#endif
1903                        u32 stored_lft;
1904
1905                        /* update lifetime (RFC2462 5.5.3 e) */
1906                        spin_lock(&ifp->lock);
1907                        now = jiffies;
1908                        if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1909                                stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1910                        else
1911                                stored_lft = 0;
1912                        if (!update_lft && stored_lft) {
1913                                if (valid_lft > MIN_VALID_LIFETIME ||
1914                                    valid_lft > stored_lft)
1915                                        update_lft = 1;
1916                                else if (stored_lft <= MIN_VALID_LIFETIME) {
1917                                        /* valid_lft <= stored_lft is always true */
1918                                        /* XXX: IPsec */
1919                                        update_lft = 0;
1920                                } else {
1921                                        valid_lft = MIN_VALID_LIFETIME;
1922                                        if (valid_lft < prefered_lft)
1923                                                prefered_lft = valid_lft;
1924                                        update_lft = 1;
1925                                }
1926                        }
1927
1928                        if (update_lft) {
1929                                ifp->valid_lft = valid_lft;
1930                                ifp->prefered_lft = prefered_lft;
1931                                ifp->tstamp = now;
1932                                flags = ifp->flags;
1933                                ifp->flags &= ~IFA_F_DEPRECATED;
1934                                spin_unlock(&ifp->lock);
1935
1936                                if (!(flags&IFA_F_TENTATIVE))
1937                                        ipv6_ifa_notify(0, ifp);
1938                        } else
1939                                spin_unlock(&ifp->lock);
1940
1941#ifdef CONFIG_IPV6_PRIVACY
1942                        read_lock_bh(&in6_dev->lock);
1943                        /* update all temporary addresses in the list */
1944                        for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1945                                /*
1946                                 * When adjusting the lifetimes of an existing
1947                                 * temporary address, only lower the lifetimes.
1948                                 * Implementations must not increase the
1949                                 * lifetimes of an existing temporary address
1950                                 * when processing a Prefix Information Option.
1951                                 */
1952                                if (ifp != ift->ifpub)
1953                                        continue;
1954
1955                                spin_lock(&ift->lock);
1956                                flags = ift->flags;
1957                                if (ift->valid_lft > valid_lft &&
1958                                    ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1959                                        ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1960                                if (ift->prefered_lft > prefered_lft &&
1961                                    ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1962                                        ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1963                                spin_unlock(&ift->lock);
1964                                if (!(flags&IFA_F_TENTATIVE))
1965                                        ipv6_ifa_notify(0, ift);
1966                        }
1967
1968                        if (create && in6_dev->cnf.use_tempaddr > 0) {
1969                                /*
1970                                 * When a new public address is created as described in [ADDRCONF],
1971                                 * also create a new temporary address.
1972                                 */
1973                                read_unlock_bh(&in6_dev->lock);
1974                                ipv6_create_tempaddr(ifp, NULL);
1975                        } else {
1976                                read_unlock_bh(&in6_dev->lock);
1977                        }
1978#endif
1979                        in6_ifa_put(ifp);
1980                        addrconf_verify(0);
1981                }
1982        }
1983        inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1984        in6_dev_put(in6_dev);
1985}
1986
1987/*
1988 *      Set destination address.
1989 *      Special case for SIT interfaces where we create a new "virtual"
1990 *      device.
1991 */
1992int addrconf_set_dstaddr(struct net *net, void __user *arg)
1993{
1994        struct in6_ifreq ireq;
1995        struct net_device *dev;
1996        int err = -EINVAL;
1997
1998        rtnl_lock();
1999
2000        err = -EFAULT;
2001        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2002                goto err_exit;
2003
2004        dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2005
2006        err = -ENODEV;
2007        if (dev == NULL)
2008                goto err_exit;
2009
2010#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2011        if (dev->type == ARPHRD_SIT) {
2012                const struct net_device_ops *ops = dev->netdev_ops;
2013                struct ifreq ifr;
2014                struct ip_tunnel_parm p;
2015
2016                err = -EADDRNOTAVAIL;
2017                if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2018                        goto err_exit;
2019
2020                memset(&p, 0, sizeof(p));
2021                p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2022                p.iph.saddr = 0;
2023                p.iph.version = 4;
2024                p.iph.ihl = 5;
2025                p.iph.protocol = IPPROTO_IPV6;
2026                p.iph.ttl = 64;
2027                ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2028
2029                if (ops->ndo_do_ioctl) {
2030                        mm_segment_t oldfs = get_fs();
2031
2032                        set_fs(KERNEL_DS);
2033                        err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2034                        set_fs(oldfs);
2035                } else
2036                        err = -EOPNOTSUPP;
2037
2038                if (err == 0) {
2039                        err = -ENOBUFS;
2040                        dev = __dev_get_by_name(net, p.name);
2041                        if (!dev)
2042                                goto err_exit;
2043                        err = dev_open(dev);
2044                }
2045        }
2046#endif
2047
2048err_exit:
2049        rtnl_unlock();
2050        return err;
2051}
2052
2053/*
2054 *      Manual configuration of address on an interface
2055 */
2056static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2057                          unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2058                          __u32 valid_lft)
2059{
2060        struct inet6_ifaddr *ifp;
2061        struct inet6_dev *idev;
2062        struct net_device *dev;
2063        int scope;
2064        u32 flags;
2065        clock_t expires;
2066        unsigned long timeout;
2067
2068        ASSERT_RTNL();
2069
2070        if (plen > 128)
2071                return -EINVAL;
2072
2073        /* check the lifetime */
2074        if (!valid_lft || prefered_lft > valid_lft)
2075                return -EINVAL;
2076
2077        dev = __dev_get_by_index(net, ifindex);
2078        if (!dev)
2079                return -ENODEV;
2080
2081        if ((idev = addrconf_add_dev(dev)) == NULL)
2082                return -ENOBUFS;
2083
2084        scope = ipv6_addr_scope(pfx);
2085
2086        timeout = addrconf_timeout_fixup(valid_lft, HZ);
2087        if (addrconf_finite_timeout(timeout)) {
2088                expires = jiffies_to_clock_t(timeout * HZ);
2089                valid_lft = timeout;
2090                flags = RTF_EXPIRES;
2091        } else {
2092                expires = 0;
2093                flags = 0;
2094                ifa_flags |= IFA_F_PERMANENT;
2095        }
2096
2097        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2098        if (addrconf_finite_timeout(timeout)) {
2099                if (timeout == 0)
2100                        ifa_flags |= IFA_F_DEPRECATED;
2101                prefered_lft = timeout;
2102        }
2103
2104        ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2105
2106        if (!IS_ERR(ifp)) {
2107                spin_lock_bh(&ifp->lock);
2108                ifp->valid_lft = valid_lft;
2109                ifp->prefered_lft = prefered_lft;
2110                ifp->tstamp = jiffies;
2111                spin_unlock_bh(&ifp->lock);
2112
2113                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2114                                      expires, flags);
2115                /*
2116                 * Note that section 3.1 of RFC 4429 indicates
2117                 * that the Optimistic flag should not be set for
2118                 * manually configured addresses
2119                 */
2120                addrconf_dad_start(ifp, 0);
2121                in6_ifa_put(ifp);
2122                addrconf_verify(0);
2123                return 0;
2124        }
2125
2126        return PTR_ERR(ifp);
2127}
2128
2129static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2130                          unsigned int plen)
2131{
2132        struct inet6_ifaddr *ifp;
2133        struct inet6_dev *idev;
2134        struct net_device *dev;
2135
2136        if (plen > 128)
2137                return -EINVAL;
2138
2139        dev = __dev_get_by_index(net, ifindex);
2140        if (!dev)
2141                return -ENODEV;
2142
2143        if ((idev = __in6_dev_get(dev)) == NULL)
2144                return -ENXIO;
2145
2146        read_lock_bh(&idev->lock);
2147        for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2148                if (ifp->prefix_len == plen &&
2149                    ipv6_addr_equal(pfx, &ifp->addr)) {
2150                        in6_ifa_hold(ifp);
2151                        read_unlock_bh(&idev->lock);
2152
2153                        ipv6_del_addr(ifp);
2154
2155                        /* If the last address is deleted administratively,
2156                           disable IPv6 on this interface.
2157                         */
2158                        if (idev->addr_list == NULL)
2159                                addrconf_ifdown(idev->dev, 1);
2160                        return 0;
2161                }
2162        }
2163        read_unlock_bh(&idev->lock);
2164        return -EADDRNOTAVAIL;
2165}
2166
2167
2168int addrconf_add_ifaddr(struct net *net, void __user *arg)
2169{
2170        struct in6_ifreq ireq;
2171        int err;
2172
2173        if (!capable(CAP_NET_ADMIN))
2174                return -EPERM;
2175
2176        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2177                return -EFAULT;
2178
2179        rtnl_lock();
2180        err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2181                             ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2182                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2183        rtnl_unlock();
2184        return err;
2185}
2186
2187int addrconf_del_ifaddr(struct net *net, void __user *arg)
2188{
2189        struct in6_ifreq ireq;
2190        int err;
2191
2192        if (!capable(CAP_NET_ADMIN))
2193                return -EPERM;
2194
2195        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2196                return -EFAULT;
2197
2198        rtnl_lock();
2199        err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2200                             ireq.ifr6_prefixlen);
2201        rtnl_unlock();
2202        return err;
2203}
2204
2205static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2206                     int plen, int scope)
2207{
2208        struct inet6_ifaddr *ifp;
2209
2210        ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2211        if (!IS_ERR(ifp)) {
2212                spin_lock_bh(&ifp->lock);
2213                ifp->flags &= ~IFA_F_TENTATIVE;
2214                spin_unlock_bh(&ifp->lock);
2215                ipv6_ifa_notify(RTM_NEWADDR, ifp);
2216                in6_ifa_put(ifp);
2217        }
2218}
2219
2220#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2221static void sit_add_v4_addrs(struct inet6_dev *idev)
2222{
2223        struct in6_addr addr;
2224        struct net_device *dev;
2225        struct net *net = dev_net(idev->dev);
2226        int scope;
2227
2228        ASSERT_RTNL();
2229
2230        memset(&addr, 0, sizeof(struct in6_addr));
2231        memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2232
2233        if (idev->dev->flags&IFF_POINTOPOINT) {
2234                addr.s6_addr32[0] = htonl(0xfe800000);
2235                scope = IFA_LINK;
2236        } else {
2237                scope = IPV6_ADDR_COMPATv4;
2238        }
2239
2240        if (addr.s6_addr32[3]) {
2241                add_addr(idev, &addr, 128, scope);
2242                return;
2243        }
2244
2245        for_each_netdev(net, dev) {
2246                struct in_device * in_dev = __in_dev_get_rtnl(dev);
2247                if (in_dev && (dev->flags & IFF_UP)) {
2248                        struct in_ifaddr * ifa;
2249
2250                        int flag = scope;
2251
2252                        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2253                                int plen;
2254
2255                                addr.s6_addr32[3] = ifa->ifa_local;
2256
2257                                if (ifa->ifa_scope == RT_SCOPE_LINK)
2258                                        continue;
2259                                if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2260                                        if (idev->dev->flags&IFF_POINTOPOINT)
2261                                                continue;
2262                                        flag |= IFA_HOST;
2263                                }
2264                                if (idev->dev->flags&IFF_POINTOPOINT)
2265                                        plen = 64;
2266                                else
2267                                        plen = 96;
2268
2269                                add_addr(idev, &addr, plen, flag);
2270                        }
2271                }
2272        }
2273}
2274#endif
2275
2276static void init_loopback(struct net_device *dev)
2277{
2278        struct inet6_dev  *idev;
2279
2280        /* ::1 */
2281
2282        ASSERT_RTNL();
2283
2284        if ((idev = ipv6_find_idev(dev)) == NULL) {
2285                printk(KERN_DEBUG "init loopback: add_dev failed\n");
2286                return;
2287        }
2288
2289        add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2290}
2291
2292static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2293{
2294        struct inet6_ifaddr * ifp;
2295        u32 addr_flags = IFA_F_PERMANENT;
2296
2297#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2298        if (idev->cnf.optimistic_dad &&
2299            !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2300                addr_flags |= IFA_F_OPTIMISTIC;
2301#endif
2302
2303
2304        ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2305        if (!IS_ERR(ifp)) {
2306                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2307                addrconf_dad_start(ifp, 0);
2308                in6_ifa_put(ifp);
2309        }
2310}
2311
2312static void addrconf_dev_config(struct net_device *dev)
2313{
2314        struct in6_addr addr;
2315        struct inet6_dev    * idev;
2316
2317        ASSERT_RTNL();
2318
2319        if ((dev->type != ARPHRD_ETHER) &&
2320            (dev->type != ARPHRD_FDDI) &&
2321            (dev->type != ARPHRD_IEEE802_TR) &&
2322            (dev->type != ARPHRD_ARCNET) &&
2323            (dev->type != ARPHRD_INFINIBAND)) {
2324                /* Alas, we support only Ethernet autoconfiguration. */
2325                return;
2326        }
2327
2328        idev = addrconf_add_dev(dev);
2329        if (idev == NULL)
2330                return;
2331
2332        memset(&addr, 0, sizeof(struct in6_addr));
2333        addr.s6_addr32[0] = htonl(0xFE800000);
2334
2335        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2336                addrconf_add_linklocal(idev, &addr);
2337}
2338
2339#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2340static void addrconf_sit_config(struct net_device *dev)
2341{
2342        struct inet6_dev *idev;
2343
2344        ASSERT_RTNL();
2345
2346        /*
2347         * Configure the tunnel with one of our IPv4
2348         * addresses... we should configure all of
2349         * our v4 addrs in the tunnel
2350         */
2351
2352        if ((idev = ipv6_find_idev(dev)) == NULL) {
2353                printk(KERN_DEBUG "init sit: add_dev failed\n");
2354                return;
2355        }
2356
2357        if (dev->priv_flags & IFF_ISATAP) {
2358                struct in6_addr addr;
2359
2360                ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2361                addrconf_prefix_route(&addr, 64, dev, 0, 0);
2362                if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2363                        addrconf_add_linklocal(idev, &addr);
2364                return;
2365        }
2366
2367        sit_add_v4_addrs(idev);
2368
2369        if (dev->flags&IFF_POINTOPOINT) {
2370                addrconf_add_mroute(dev);
2371                addrconf_add_lroute(dev);
2372        } else
2373                sit_route_add(dev);
2374}
2375#endif
2376
2377static inline int
2378ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2379{
2380        struct in6_addr lladdr;
2381
2382        if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2383                addrconf_add_linklocal(idev, &lladdr);
2384                return 0;
2385        }
2386        return -1;
2387}
2388
2389static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2390{
2391        struct net_device *link_dev;
2392        struct net *net = dev_net(idev->dev);
2393
2394        /* first try to inherit the link-local address from the link device */
2395        if (idev->dev->iflink &&
2396            (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2397                if (!ipv6_inherit_linklocal(idev, link_dev))
2398                        return;
2399        }
2400        /* then try to inherit it from any device */
2401        for_each_netdev(net, link_dev) {
2402                if (!ipv6_inherit_linklocal(idev, link_dev))
2403                        return;
2404        }
2405        printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2406}
2407
2408/*
2409 * Autoconfigure tunnel with a link-local address so routing protocols,
2410 * DHCPv6, MLD etc. can be run over the virtual link
2411 */
2412
2413static void addrconf_ip6_tnl_config(struct net_device *dev)
2414{
2415        struct inet6_dev *idev;
2416
2417        ASSERT_RTNL();
2418
2419        if ((idev = addrconf_add_dev(dev)) == NULL) {
2420                printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2421                return;
2422        }
2423        ip6_tnl_add_linklocal(idev);
2424}
2425
2426static int addrconf_notify(struct notifier_block *this, unsigned long event,
2427                           void * data)
2428{
2429        struct net_device *dev = (struct net_device *) data;
2430        struct inet6_dev *idev = __in6_dev_get(dev);
2431        int run_pending = 0;
2432        int err;
2433
2434        switch(event) {
2435        case NETDEV_REGISTER:
2436                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2437                        idev = ipv6_add_dev(dev);
2438                        if (!idev)
2439                                return notifier_from_errno(-ENOMEM);
2440                }
2441                break;
2442        case NETDEV_UP:
2443        case NETDEV_CHANGE:
2444                if (dev->flags & IFF_SLAVE)
2445                        break;
2446
2447                if (event == NETDEV_UP) {
2448                        if (!addrconf_qdisc_ok(dev)) {
2449                                /* device is not ready yet. */
2450                                printk(KERN_INFO
2451                                        "ADDRCONF(NETDEV_UP): %s: "
2452                                        "link is not ready\n",
2453                                        dev->name);
2454                                break;
2455                        }
2456
2457                        if (!idev && dev->mtu >= IPV6_MIN_MTU)
2458                                idev = ipv6_add_dev(dev);
2459
2460                        if (idev) {
2461                                idev->if_flags |= IF_READY;
2462                                run_pending = 1;
2463                        }
2464                } else {
2465                        if (!addrconf_qdisc_ok(dev)) {
2466                                /* device is still not ready. */
2467                                break;
2468                        }
2469
2470                        if (idev) {
2471                                if (idev->if_flags & IF_READY) {
2472                                        /* device is already configured. */
2473                                        break;
2474                                }
2475                                idev->if_flags |= IF_READY;
2476                        }
2477
2478                        printk(KERN_INFO
2479                                        "ADDRCONF(NETDEV_CHANGE): %s: "
2480                                        "link becomes ready\n",
2481                                        dev->name);
2482
2483                        run_pending = 1;
2484                }
2485
2486                switch(dev->type) {
2487#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2488                case ARPHRD_SIT:
2489                        addrconf_sit_config(dev);
2490                        break;
2491#endif
2492                case ARPHRD_TUNNEL6:
2493                        addrconf_ip6_tnl_config(dev);
2494                        break;
2495                case ARPHRD_LOOPBACK:
2496                        init_loopback(dev);
2497                        break;
2498
2499                default:
2500                        addrconf_dev_config(dev);
2501                        break;
2502                }
2503                if (idev) {
2504                        if (run_pending)
2505                                addrconf_dad_run(idev);
2506
2507                        /* If the MTU changed during the interface down, when the
2508                           interface up, the changed MTU must be reflected in the
2509                           idev as well as routers.
2510                         */
2511                        if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2512                                rt6_mtu_change(dev, dev->mtu);
2513                                idev->cnf.mtu6 = dev->mtu;
2514                        }
2515                        idev->tstamp = jiffies;
2516                        inet6_ifinfo_notify(RTM_NEWLINK, idev);
2517                        /* If the changed mtu during down is lower than IPV6_MIN_MTU
2518                           stop IPv6 on this interface.
2519                         */
2520                        if (dev->mtu < IPV6_MIN_MTU)
2521                                addrconf_ifdown(dev, event != NETDEV_DOWN);
2522                }
2523                break;
2524
2525        case NETDEV_CHANGEMTU:
2526                if (idev && dev->mtu >= IPV6_MIN_MTU) {
2527                        rt6_mtu_change(dev, dev->mtu);
2528                        idev->cnf.mtu6 = dev->mtu;
2529                        break;
2530                }
2531
2532                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2533                        idev = ipv6_add_dev(dev);
2534                        if (idev)
2535                                break;
2536                }
2537
2538                /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2539
2540        case NETDEV_DOWN:
2541        case NETDEV_UNREGISTER:
2542                /*
2543                 *      Remove all addresses from this interface.
2544                 */
2545                addrconf_ifdown(dev, event != NETDEV_DOWN);
2546                break;
2547
2548        case NETDEV_CHANGENAME:
2549                if (idev) {
2550                        snmp6_unregister_dev(idev);
2551                        addrconf_sysctl_unregister(idev);
2552                        addrconf_sysctl_register(idev);
2553                        err = snmp6_register_dev(idev);
2554                        if (err)
2555                                return notifier_from_errno(err);
2556                }
2557                break;
2558        }
2559
2560        return NOTIFY_OK;
2561}
2562
2563/*
2564 *      addrconf module should be notified of a device going up
2565 */
2566static struct notifier_block ipv6_dev_notf = {
2567        .notifier_call = addrconf_notify,
2568        .priority = 0
2569};
2570
2571static int addrconf_ifdown(struct net_device *dev, int how)
2572{
2573        struct inet6_dev *idev;
2574        struct inet6_ifaddr *ifa, **bifa;
2575        struct net *net = dev_net(dev);
2576        int i;
2577
2578        ASSERT_RTNL();
2579
2580        rt6_ifdown(net, dev);
2581        neigh_ifdown(&nd_tbl, dev);
2582
2583        idev = __in6_dev_get(dev);
2584        if (idev == NULL)
2585                return -ENODEV;
2586
2587        /* Step 1: remove reference to ipv6 device from parent device.
2588                   Do not dev_put!
2589         */
2590        if (how) {
2591                idev->dead = 1;
2592
2593                /* protected by rtnl_lock */
2594                rcu_assign_pointer(dev->ip6_ptr, NULL);
2595
2596                /* Step 1.5: remove snmp6 entry */
2597                snmp6_unregister_dev(idev);
2598
2599        }
2600
2601        /* Step 2: clear hash table */
2602        for (i=0; i<IN6_ADDR_HSIZE; i++) {
2603                bifa = &inet6_addr_lst[i];
2604
2605                write_lock_bh(&addrconf_hash_lock);
2606                while ((ifa = *bifa) != NULL) {
2607                        if (ifa->idev == idev) {
2608                                *bifa = ifa->lst_next;
2609                                ifa->lst_next = NULL;
2610                                addrconf_del_timer(ifa);
2611                                in6_ifa_put(ifa);
2612                                continue;
2613                        }
2614                        bifa = &ifa->lst_next;
2615                }
2616                write_unlock_bh(&addrconf_hash_lock);
2617        }
2618
2619        write_lock_bh(&idev->lock);
2620
2621        /* Step 3: clear flags for stateless addrconf */
2622        if (!how)
2623                idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2624
2625        /* Step 4: clear address list */
2626#ifdef CONFIG_IPV6_PRIVACY
2627        if (how && del_timer(&idev->regen_timer))
2628                in6_dev_put(idev);
2629
2630        /* clear tempaddr list */
2631        while ((ifa = idev->tempaddr_list) != NULL) {
2632                idev->tempaddr_list = ifa->tmp_next;
2633                ifa->tmp_next = NULL;
2634                ifa->dead = 1;
2635                write_unlock_bh(&idev->lock);
2636                spin_lock_bh(&ifa->lock);
2637
2638                if (ifa->ifpub) {
2639                        in6_ifa_put(ifa->ifpub);
2640                        ifa->ifpub = NULL;
2641                }
2642                spin_unlock_bh(&ifa->lock);
2643                in6_ifa_put(ifa);
2644                write_lock_bh(&idev->lock);
2645        }
2646#endif
2647        while ((ifa = idev->addr_list) != NULL) {
2648                idev->addr_list = ifa->if_next;
2649                ifa->if_next = NULL;
2650                ifa->dead = 1;
2651                addrconf_del_timer(ifa);
2652                write_unlock_bh(&idev->lock);
2653
2654                __ipv6_ifa_notify(RTM_DELADDR, ifa);
2655                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2656                in6_ifa_put(ifa);
2657
2658                write_lock_bh(&idev->lock);
2659        }
2660        write_unlock_bh(&idev->lock);
2661
2662        /* Step 5: Discard multicast list */
2663
2664        if (how)
2665                ipv6_mc_destroy_dev(idev);
2666        else
2667                ipv6_mc_down(idev);
2668
2669        idev->tstamp = jiffies;
2670
2671        /* Shot the device (if unregistered) */
2672
2673        if (how) {
2674                addrconf_sysctl_unregister(idev);
2675                neigh_parms_release(&nd_tbl, idev->nd_parms);
2676                neigh_ifdown(&nd_tbl, dev);
2677                in6_dev_put(idev);
2678        }
2679        return 0;
2680}
2681
2682static void addrconf_rs_timer(unsigned long data)
2683{
2684        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2685
2686        if (ifp->idev->cnf.forwarding)
2687                goto out;
2688
2689        if (ifp->idev->if_flags & IF_RA_RCVD) {
2690                /*
2691                 *      Announcement received after solicitation
2692                 *      was sent
2693                 */
2694                goto out;
2695        }
2696
2697        spin_lock(&ifp->lock);
2698        if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2699                /* The wait after the last probe can be shorter */
2700                addrconf_mod_timer(ifp, AC_RS,
2701                                   (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2702                                   ifp->idev->cnf.rtr_solicit_delay :
2703                                   ifp->idev->cnf.rtr_solicit_interval);
2704                spin_unlock(&ifp->lock);
2705
2706                ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2707        } else {
2708                spin_unlock(&ifp->lock);
2709                /*
2710                 * Note: we do not support deprecated "all on-link"
2711                 * assumption any longer.
2712                 */
2713                printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2714                       ifp->idev->dev->name);
2715        }
2716
2717out:
2718        in6_ifa_put(ifp);
2719}
2720
2721/*
2722 *      Duplicate Address Detection
2723 */
2724static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2725{
2726        unsigned long rand_num;
2727        struct inet6_dev *idev = ifp->idev;
2728
2729        if (ifp->flags & IFA_F_OPTIMISTIC)
2730                rand_num = 0;
2731        else
2732                rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2733
2734        ifp->probes = idev->cnf.dad_transmits;
2735        addrconf_mod_timer(ifp, AC_DAD, rand_num);
2736}
2737
2738static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2739{
2740        struct inet6_dev *idev = ifp->idev;
2741        struct net_device *dev = idev->dev;
2742
2743        addrconf_join_solict(dev, &ifp->addr);
2744
2745        net_srandom(ifp->addr.s6_addr32[3]);
2746
2747        read_lock_bh(&idev->lock);
2748        if (ifp->dead)
2749                goto out;
2750        spin_lock_bh(&ifp->lock);
2751
2752        if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2753            idev->cnf.accept_dad < 1 ||
2754            !(ifp->flags&IFA_F_TENTATIVE) ||
2755            ifp->flags & IFA_F_NODAD) {
2756                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2757                spin_unlock_bh(&ifp->lock);
2758                read_unlock_bh(&idev->lock);
2759
2760                addrconf_dad_completed(ifp);
2761                return;
2762        }
2763
2764        if (!(idev->if_flags & IF_READY)) {
2765                spin_unlock_bh(&ifp->lock);
2766                read_unlock_bh(&idev->lock);
2767                /*
2768                 * If the defice is not ready:
2769                 * - keep it tentative if it is a permanent address.
2770                 * - otherwise, kill it.
2771                 */
2772                in6_ifa_hold(ifp);
2773                addrconf_dad_stop(ifp);
2774                return;
2775        }
2776
2777        /*
2778         * Optimistic nodes can start receiving
2779         * Frames right away
2780         */
2781        if(ifp->flags & IFA_F_OPTIMISTIC)
2782                ip6_ins_rt(ifp->rt);
2783
2784        addrconf_dad_kick(ifp);
2785        spin_unlock_bh(&ifp->lock);
2786out:
2787        read_unlock_bh(&idev->lock);
2788}
2789
2790static void addrconf_dad_timer(unsigned long data)
2791{
2792        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2793        struct inet6_dev *idev = ifp->idev;
2794        struct in6_addr mcaddr;
2795
2796        read_lock_bh(&idev->lock);
2797        if (idev->dead) {
2798                read_unlock_bh(&idev->lock);
2799                goto out;
2800        }
2801        spin_lock_bh(&ifp->lock);
2802        if (ifp->probes == 0) {
2803                /*
2804                 * DAD was successful
2805                 */
2806
2807                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2808                spin_unlock_bh(&ifp->lock);
2809                read_unlock_bh(&idev->lock);
2810
2811                addrconf_dad_completed(ifp);
2812
2813                goto out;
2814        }
2815
2816        ifp->probes--;
2817        addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2818        spin_unlock_bh(&ifp->lock);
2819        read_unlock_bh(&idev->lock);
2820
2821        /* send a neighbour solicitation for our addr */
2822        addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2823        ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2824out:
2825        in6_ifa_put(ifp);
2826}
2827
2828static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2829{
2830        struct net_device *     dev = ifp->idev->dev;
2831
2832        /*
2833         *      Configure the address for reception. Now it is valid.
2834         */
2835
2836        ipv6_ifa_notify(RTM_NEWADDR, ifp);
2837
2838        /* If added prefix is link local and forwarding is off,
2839           start sending router solicitations.
2840         */
2841
2842        if (ifp->idev->cnf.forwarding == 0 &&
2843            ifp->idev->cnf.rtr_solicits > 0 &&
2844            (dev->flags&IFF_LOOPBACK) == 0 &&
2845            (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2846                /*
2847                 *      If a host as already performed a random delay
2848                 *      [...] as part of DAD [...] there is no need
2849                 *      to delay again before sending the first RS
2850                 */
2851                ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2852
2853                spin_lock_bh(&ifp->lock);
2854                ifp->probes = 1;
2855                ifp->idev->if_flags |= IF_RS_SENT;
2856                addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2857                spin_unlock_bh(&ifp->lock);
2858        }
2859}
2860
2861static void addrconf_dad_run(struct inet6_dev *idev) {
2862        struct inet6_ifaddr *ifp;
2863
2864        read_lock_bh(&idev->lock);
2865        for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2866                spin_lock_bh(&ifp->lock);
2867                if (!(ifp->flags & IFA_F_TENTATIVE)) {
2868                        spin_unlock_bh(&ifp->lock);
2869                        continue;
2870                }
2871                spin_unlock_bh(&ifp->lock);
2872                addrconf_dad_kick(ifp);
2873        }
2874        read_unlock_bh(&idev->lock);
2875}
2876
2877#ifdef CONFIG_PROC_FS
2878struct if6_iter_state {
2879        struct seq_net_private p;
2880        int bucket;
2881};
2882
2883static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2884{
2885        struct inet6_ifaddr *ifa = NULL;
2886        struct if6_iter_state *state = seq->private;
2887        struct net *net = seq_file_net(seq);
2888
2889        for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2890                ifa = inet6_addr_lst[state->bucket];
2891
2892                while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2893                        ifa = ifa->lst_next;
2894                if (ifa)
2895                        break;
2896        }
2897        return ifa;
2898}
2899
2900static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2901{
2902        struct if6_iter_state *state = seq->private;
2903        struct net *net = seq_file_net(seq);
2904
2905        ifa = ifa->lst_next;
2906try_again:
2907        if (ifa) {
2908                if (!net_eq(dev_net(ifa->idev->dev), net)) {
2909                        ifa = ifa->lst_next;
2910                        goto try_again;
2911                }
2912        }
2913
2914        if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2915                ifa = inet6_addr_lst[state->bucket];
2916                goto try_again;
2917        }
2918
2919        return ifa;
2920}
2921
2922static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2923{
2924        struct inet6_ifaddr *ifa = if6_get_first(seq);
2925
2926        if (ifa)
2927                while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2928                        --pos;
2929        return pos ? NULL : ifa;
2930}
2931
2932static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2933        __acquires(addrconf_hash_lock)
2934{
2935        read_lock_bh(&addrconf_hash_lock);
2936        return if6_get_idx(seq, *pos);
2937}
2938
2939static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2940{
2941        struct inet6_ifaddr *ifa;
2942
2943        ifa = if6_get_next(seq, v);
2944        ++*pos;
2945        return ifa;
2946}
2947
2948static void if6_seq_stop(struct seq_file *seq, void *v)
2949        __releases(addrconf_hash_lock)
2950{
2951        read_unlock_bh(&addrconf_hash_lock);
2952}
2953
2954static int if6_seq_show(struct seq_file *seq, void *v)
2955{
2956        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2957        seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
2958                   &ifp->addr,
2959                   ifp->idev->dev->ifindex,
2960                   ifp->prefix_len,
2961                   ifp->scope,
2962                   ifp->flags,
2963                   ifp->idev->dev->name);
2964        return 0;
2965}
2966
2967static const struct seq_operations if6_seq_ops = {
2968        .start  = if6_seq_start,
2969        .next   = if6_seq_next,
2970        .show   = if6_seq_show,
2971        .stop   = if6_seq_stop,
2972};
2973
2974static int if6_seq_open(struct inode *inode, struct file *file)
2975{
2976        return seq_open_net(inode, file, &if6_seq_ops,
2977                            sizeof(struct if6_iter_state));
2978}
2979
2980static const struct file_operations if6_fops = {
2981        .owner          = THIS_MODULE,
2982        .open           = if6_seq_open,
2983        .read           = seq_read,
2984        .llseek         = seq_lseek,
2985        .release        = seq_release_net,
2986};
2987
2988static int if6_proc_net_init(struct net *net)
2989{
2990        if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2991                return -ENOMEM;
2992        return 0;
2993}
2994
2995static void if6_proc_net_exit(struct net *net)
2996{
2997       proc_net_remove(net, "if_inet6");
2998}
2999
3000static struct pernet_operations if6_proc_net_ops = {
3001       .init = if6_proc_net_init,
3002       .exit = if6_proc_net_exit,
3003};
3004
3005int __init if6_proc_init(void)
3006{
3007        return register_pernet_subsys(&if6_proc_net_ops);
3008}
3009
3010void if6_proc_exit(void)
3011{
3012        unregister_pernet_subsys(&if6_proc_net_ops);
3013}
3014#endif  /* CONFIG_PROC_FS */
3015
3016#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3017/* Check if address is a home address configured on any interface. */
3018int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3019{
3020        int ret = 0;
3021        struct inet6_ifaddr * ifp;
3022        u8 hash = ipv6_addr_hash(addr);
3023        read_lock_bh(&addrconf_hash_lock);
3024        for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3025                if (!net_eq(dev_net(ifp->idev->dev), net))
3026                        continue;
3027                if (ipv6_addr_equal(&ifp->addr, addr) &&
3028                    (ifp->flags & IFA_F_HOMEADDRESS)) {
3029                        ret = 1;
3030                        break;
3031                }
3032        }
3033        read_unlock_bh(&addrconf_hash_lock);
3034        return ret;
3035}
3036#endif
3037
3038/*
3039 *      Periodic address status verification
3040 */
3041
3042static void addrconf_verify(unsigned long foo)
3043{
3044        struct inet6_ifaddr *ifp;
3045        unsigned long now, next;
3046        int i;
3047
3048        spin_lock_bh(&addrconf_verify_lock);
3049        now = jiffies;
3050        next = now + ADDR_CHECK_FREQUENCY;
3051
3052        del_timer(&addr_chk_timer);
3053
3054        for (i=0; i < IN6_ADDR_HSIZE; i++) {
3055
3056restart:
3057                read_lock(&addrconf_hash_lock);
3058                for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3059                        unsigned long age;
3060#ifdef CONFIG_IPV6_PRIVACY
3061                        unsigned long regen_advance;
3062#endif
3063
3064                        if (ifp->flags & IFA_F_PERMANENT)
3065                                continue;
3066
3067                        spin_lock(&ifp->lock);
3068                        age = (now - ifp->tstamp) / HZ;
3069
3070#ifdef CONFIG_IPV6_PRIVACY
3071                        regen_advance = ifp->idev->cnf.regen_max_retry *
3072                                        ifp->idev->cnf.dad_transmits *
3073                                        ifp->idev->nd_parms->retrans_time / HZ;
3074#endif
3075
3076                        if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3077                            age >= ifp->valid_lft) {
3078                                spin_unlock(&ifp->lock);
3079                                in6_ifa_hold(ifp);
3080                                read_unlock(&addrconf_hash_lock);
3081                                ipv6_del_addr(ifp);
3082                                goto restart;
3083                        } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3084                                spin_unlock(&ifp->lock);
3085                                continue;
3086                        } else if (age >= ifp->prefered_lft) {
3087                                /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3088                                int deprecate = 0;
3089
3090                                if (!(ifp->flags&IFA_F_DEPRECATED)) {
3091                                        deprecate = 1;
3092                                        ifp->flags |= IFA_F_DEPRECATED;
3093                                }
3094
3095                                if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3096                                        next = ifp->tstamp + ifp->valid_lft * HZ;
3097
3098                                spin_unlock(&ifp->lock);
3099
3100                                if (deprecate) {
3101                                        in6_ifa_hold(ifp);
3102                                        read_unlock(&addrconf_hash_lock);
3103
3104                                        ipv6_ifa_notify(0, ifp);
3105                                        in6_ifa_put(ifp);
3106                                        goto restart;
3107                                }
3108#ifdef CONFIG_IPV6_PRIVACY
3109                        } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3110                                   !(ifp->flags&IFA_F_TENTATIVE)) {
3111                                if (age >= ifp->prefered_lft - regen_advance) {
3112                                        struct inet6_ifaddr *ifpub = ifp->ifpub;
3113                                        if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3114                                                next = ifp->tstamp + ifp->prefered_lft * HZ;
3115                                        if (!ifp->regen_count && ifpub) {
3116                                                ifp->regen_count++;
3117                                                in6_ifa_hold(ifp);
3118                                                in6_ifa_hold(ifpub);
3119                                                spin_unlock(&ifp->lock);
3120                                                read_unlock(&addrconf_hash_lock);
3121                                                spin_lock(&ifpub->lock);
3122                                                ifpub->regen_count = 0;
3123                                                spin_unlock(&ifpub->lock);
3124                                                ipv6_create_tempaddr(ifpub, ifp);
3125                                                in6_ifa_put(ifpub);
3126                                                in6_ifa_put(ifp);
3127                                                goto restart;
3128                                        }
3129                                } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3130                                        next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3131                                spin_unlock(&ifp->lock);
3132#endif
3133                        } else {
3134                                /* ifp->prefered_lft <= ifp->valid_lft */
3135                                if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3136                                        next = ifp->tstamp + ifp->prefered_lft * HZ;
3137                                spin_unlock(&ifp->lock);
3138                        }
3139                }
3140                read_unlock(&addrconf_hash_lock);
3141        }
3142
3143        addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3144        add_timer(&addr_chk_timer);
3145        spin_unlock_bh(&addrconf_verify_lock);
3146}
3147
3148static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3149{
3150        struct in6_addr *pfx = NULL;
3151
3152        if (addr)
3153                pfx = nla_data(addr);
3154
3155        if (local) {
3156                if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3157                        pfx = NULL;
3158                else
3159                        pfx = nla_data(local);
3160        }
3161
3162        return pfx;
3163}
3164
3165static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3166        [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3167        [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3168        [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3169};
3170
3171static int
3172inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3173{
3174        struct net *net = sock_net(skb->sk);
3175        struct ifaddrmsg *ifm;
3176        struct nlattr *tb[IFA_MAX+1];
3177        struct in6_addr *pfx;
3178        int err;
3179
3180        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3181        if (err < 0)
3182                return err;
3183
3184        ifm = nlmsg_data(nlh);
3185        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3186        if (pfx == NULL)
3187                return -EINVAL;
3188
3189        return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3190}
3191
3192static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3193                             u32 prefered_lft, u32 valid_lft)
3194{
3195        u32 flags;
3196        clock_t expires;
3197        unsigned long timeout;
3198
3199        if (!valid_lft || (prefered_lft > valid_lft))
3200                return -EINVAL;
3201
3202        timeout = addrconf_timeout_fixup(valid_lft, HZ);
3203        if (addrconf_finite_timeout(timeout)) {
3204                expires = jiffies_to_clock_t(timeout * HZ);
3205                valid_lft = timeout;
3206                flags = RTF_EXPIRES;
3207        } else {
3208                expires = 0;
3209                flags = 0;
3210                ifa_flags |= IFA_F_PERMANENT;
3211        }
3212
3213        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3214        if (addrconf_finite_timeout(timeout)) {
3215                if (timeout == 0)
3216                        ifa_flags |= IFA_F_DEPRECATED;
3217                prefered_lft = timeout;
3218        }
3219
3220        spin_lock_bh(&ifp->lock);
3221        ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3222        ifp->tstamp = jiffies;
3223        ifp->valid_lft = valid_lft;
3224        ifp->prefered_lft = prefered_lft;
3225
3226        spin_unlock_bh(&ifp->lock);
3227        if (!(ifp->flags&IFA_F_TENTATIVE))
3228                ipv6_ifa_notify(0, ifp);
3229
3230        addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3231                              expires, flags);
3232        addrconf_verify(0);
3233
3234        return 0;
3235}
3236
3237static int
3238inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3239{
3240        struct net *net = sock_net(skb->sk);
3241        struct ifaddrmsg *ifm;
3242        struct nlattr *tb[IFA_MAX+1];
3243        struct in6_addr *pfx;
3244        struct inet6_ifaddr *ifa;
3245        struct net_device *dev;
3246        u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3247        u8 ifa_flags;
3248        int err;
3249
3250        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3251        if (err < 0)
3252                return err;
3253
3254        ifm = nlmsg_data(nlh);
3255        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3256        if (pfx == NULL)
3257                return -EINVAL;
3258
3259        if (tb[IFA_CACHEINFO]) {
3260                struct ifa_cacheinfo *ci;
3261
3262                ci = nla_data(tb[IFA_CACHEINFO]);
3263                valid_lft = ci->ifa_valid;
3264                preferred_lft = ci->ifa_prefered;
3265        } else {
3266                preferred_lft = INFINITY_LIFE_TIME;
3267                valid_lft = INFINITY_LIFE_TIME;
3268        }
3269
3270        dev =  __dev_get_by_index(net, ifm->ifa_index);
3271        if (dev == NULL)
3272                return -ENODEV;
3273
3274        /* We ignore other flags so far. */
3275        ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3276
3277        ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3278        if (ifa == NULL) {
3279                /*
3280                 * It would be best to check for !NLM_F_CREATE here but
3281                 * userspace alreay relies on not having to provide this.
3282                 */
3283                return inet6_addr_add(net, ifm->ifa_index, pfx,
3284                                      ifm->ifa_prefixlen, ifa_flags,
3285                                      preferred_lft, valid_lft);
3286        }
3287
3288        if (nlh->nlmsg_flags & NLM_F_EXCL ||
3289            !(nlh->nlmsg_flags & NLM_F_REPLACE))
3290                err = -EEXIST;
3291        else
3292                err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3293
3294        in6_ifa_put(ifa);
3295
3296        return err;
3297}
3298
3299static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3300                          u8 scope, int ifindex)
3301{
3302        struct ifaddrmsg *ifm;
3303
3304        ifm = nlmsg_data(nlh);
3305        ifm->ifa_family = AF_INET6;
3306        ifm->ifa_prefixlen = prefixlen;
3307        ifm->ifa_flags = flags;
3308        ifm->ifa_scope = scope;
3309        ifm->ifa_index = ifindex;
3310}
3311
3312static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3313                         unsigned long tstamp, u32 preferred, u32 valid)
3314{
3315        struct ifa_cacheinfo ci;
3316
3317        ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3318                        + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3319        ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3320                        + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3321        ci.ifa_prefered = preferred;
3322        ci.ifa_valid = valid;
3323
3324        return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3325}
3326
3327static inline int rt_scope(int ifa_scope)
3328{
3329        if (ifa_scope & IFA_HOST)
3330                return RT_SCOPE_HOST;
3331        else if (ifa_scope & IFA_LINK)
3332                return RT_SCOPE_LINK;
3333        else if (ifa_scope & IFA_SITE)
3334                return RT_SCOPE_SITE;
3335        else
3336                return RT_SCOPE_UNIVERSE;
3337}
3338
3339static inline int inet6_ifaddr_msgsize(void)
3340{
3341        return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3342               + nla_total_size(16) /* IFA_ADDRESS */
3343               + nla_total_size(sizeof(struct ifa_cacheinfo));
3344}
3345
3346static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3347                             u32 pid, u32 seq, int event, unsigned int flags)
3348{
3349        struct nlmsghdr  *nlh;
3350        u32 preferred, valid;
3351
3352        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3353        if (nlh == NULL)
3354                return -EMSGSIZE;
3355
3356        put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3357                      ifa->idev->dev->ifindex);
3358
3359        if (!(ifa->flags&IFA_F_PERMANENT)) {
3360                preferred = ifa->prefered_lft;
3361                valid = ifa->valid_lft;
3362                if (preferred != INFINITY_LIFE_TIME) {
3363                        long tval = (jiffies - ifa->tstamp)/HZ;
3364                        preferred -= tval;
3365                        if (valid != INFINITY_LIFE_TIME)
3366                                valid -= tval;
3367                }
3368        } else {
3369                preferred = INFINITY_LIFE_TIME;
3370                valid = INFINITY_LIFE_TIME;
3371        }
3372
3373        if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3374            put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3375                nlmsg_cancel(skb, nlh);
3376                return -EMSGSIZE;
3377        }
3378
3379        return nlmsg_end(skb, nlh);
3380}
3381
3382static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3383                                u32 pid, u32 seq, int event, u16 flags)
3384{
3385        struct nlmsghdr  *nlh;
3386        u8 scope = RT_SCOPE_UNIVERSE;
3387        int ifindex = ifmca->idev->dev->ifindex;
3388
3389        if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3390                scope = RT_SCOPE_SITE;
3391
3392        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3393        if (nlh == NULL)
3394                return -EMSGSIZE;
3395
3396        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3397        if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3398            put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3399                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3400                nlmsg_cancel(skb, nlh);
3401                return -EMSGSIZE;
3402        }
3403
3404        return nlmsg_end(skb, nlh);
3405}
3406
3407static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3408                                u32 pid, u32 seq, int event, unsigned int flags)
3409{
3410        struct nlmsghdr  *nlh;
3411        u8 scope = RT_SCOPE_UNIVERSE;
3412        int ifindex = ifaca->aca_idev->dev->ifindex;
3413
3414        if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3415                scope = RT_SCOPE_SITE;
3416
3417        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3418        if (nlh == NULL)
3419                return -EMSGSIZE;
3420
3421        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3422        if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3423            put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3424                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3425                nlmsg_cancel(skb, nlh);
3426                return -EMSGSIZE;
3427        }
3428
3429        return nlmsg_end(skb, nlh);
3430}
3431
3432enum addr_type_t
3433{
3434        UNICAST_ADDR,
3435        MULTICAST_ADDR,
3436        ANYCAST_ADDR,
3437};
3438
3439static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3440                           enum addr_type_t type)
3441{
3442        int idx, ip_idx;
3443        int s_idx, s_ip_idx;
3444        int err = 1;
3445        struct net_device *dev;
3446        struct inet6_dev *idev = NULL;
3447        struct inet6_ifaddr *ifa;
3448        struct ifmcaddr6 *ifmca;
3449        struct ifacaddr6 *ifaca;
3450        struct net *net = sock_net(skb->sk);
3451
3452        s_idx = cb->args[0];
3453        s_ip_idx = ip_idx = cb->args[1];
3454
3455        idx = 0;
3456        for_each_netdev(net, dev) {
3457                if (idx < s_idx)
3458                        goto cont;
3459                if (idx > s_idx)
3460                        s_ip_idx = 0;
3461                ip_idx = 0;
3462                if ((idev = in6_dev_get(dev)) == NULL)
3463                        goto cont;
3464                read_lock_bh(&idev->lock);
3465                switch (type) {
3466                case UNICAST_ADDR:
3467                        /* unicast address incl. temp addr */
3468                        for (ifa = idev->addr_list; ifa;
3469                             ifa = ifa->if_next, ip_idx++) {
3470                                if (ip_idx < s_ip_idx)
3471                                        continue;
3472                                err = inet6_fill_ifaddr(skb, ifa,
3473                                                        NETLINK_CB(cb->skb).pid,
3474                                                        cb->nlh->nlmsg_seq,
3475                                                        RTM_NEWADDR,
3476                                                        NLM_F_MULTI);
3477                        }
3478                        break;
3479                case MULTICAST_ADDR:
3480                        /* multicast address */
3481                        for (ifmca = idev->mc_list; ifmca;
3482                             ifmca = ifmca->next, ip_idx++) {
3483                                if (ip_idx < s_ip_idx)
3484                                        continue;
3485                                err = inet6_fill_ifmcaddr(skb, ifmca,
3486                                                          NETLINK_CB(cb->skb).pid,
3487                                                          cb->nlh->nlmsg_seq,
3488                                                          RTM_GETMULTICAST,
3489                                                          NLM_F_MULTI);
3490                        }
3491                        break;
3492                case ANYCAST_ADDR:
3493                        /* anycast address */
3494                        for (ifaca = idev->ac_list; ifaca;
3495                             ifaca = ifaca->aca_next, ip_idx++) {
3496                                if (ip_idx < s_ip_idx)
3497                                        continue;
3498                                err = inet6_fill_ifacaddr(skb, ifaca,
3499                                                          NETLINK_CB(cb->skb).pid,
3500                                                          cb->nlh->nlmsg_seq,
3501                                                          RTM_GETANYCAST,
3502                                                          NLM_F_MULTI);
3503                        }
3504                        break;
3505                default:
3506                        break;
3507                }
3508                read_unlock_bh(&idev->lock);
3509                in6_dev_put(idev);
3510
3511                if (err <= 0)
3512                        break;
3513cont:
3514                idx++;
3515        }
3516        cb->args[0] = idx;
3517        cb->args[1] = ip_idx;
3518        return skb->len;
3519}
3520
3521static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3522{
3523        enum addr_type_t type = UNICAST_ADDR;
3524
3525        return inet6_dump_addr(skb, cb, type);
3526}
3527
3528static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3529{
3530        enum addr_type_t type = MULTICAST_ADDR;
3531
3532        return inet6_dump_addr(skb, cb, type);
3533}
3534
3535
3536static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3537{
3538        enum addr_type_t type = ANYCAST_ADDR;
3539
3540        return inet6_dump_addr(skb, cb, type);
3541}
3542
3543static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3544                             void *arg)
3545{
3546        struct net *net = sock_net(in_skb->sk);
3547        struct ifaddrmsg *ifm;
3548        struct nlattr *tb[IFA_MAX+1];
3549        struct in6_addr *addr = NULL;
3550        struct net_device *dev = NULL;
3551        struct inet6_ifaddr *ifa;
3552        struct sk_buff *skb;
3553        int err;
3554
3555        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3556        if (err < 0)
3557                goto errout;
3558
3559        addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3560        if (addr == NULL) {
3561                err = -EINVAL;
3562                goto errout;
3563        }
3564
3565        ifm = nlmsg_data(nlh);
3566        if (ifm->ifa_index)
3567                dev = __dev_get_by_index(net, ifm->ifa_index);
3568
3569        if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3570                err = -EADDRNOTAVAIL;
3571                goto errout;
3572        }
3573
3574        if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3575                err = -ENOBUFS;
3576                goto errout_ifa;
3577        }
3578
3579        err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3580                                nlh->nlmsg_seq, RTM_NEWADDR, 0);
3581        if (err < 0) {
3582                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3583                WARN_ON(err == -EMSGSIZE);
3584                kfree_skb(skb);
3585                goto errout_ifa;
3586        }
3587        err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3588errout_ifa:
3589        in6_ifa_put(ifa);
3590errout:
3591        return err;
3592}
3593
3594static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3595{
3596        struct sk_buff *skb;
3597        struct net *net = dev_net(ifa->idev->dev);
3598        int err = -ENOBUFS;
3599
3600        skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3601        if (skb == NULL)
3602                goto errout;
3603
3604        err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3605        if (err < 0) {
3606                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3607                WARN_ON(err == -EMSGSIZE);
3608                kfree_skb(skb);
3609                goto errout;
3610        }
3611        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3612        return;
3613errout:
3614        if (err < 0)
3615                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3616}
3617
3618static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3619                                __s32 *array, int bytes)
3620{
3621        BUG_ON(bytes < (DEVCONF_MAX * 4));
3622
3623        memset(array, 0, bytes);
3624        array[DEVCONF_FORWARDING] = cnf->forwarding;
3625        array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3626        array[DEVCONF_MTU6] = cnf->mtu6;
3627        array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3628        array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3629        array[DEVCONF_AUTOCONF] = cnf->autoconf;
3630        array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3631        array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3632        array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3633        array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3634        array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3635#ifdef CONFIG_IPV6_PRIVACY
3636        array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3637        array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3638        array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3639        array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3640        array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3641#endif
3642        array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3643        array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3644        array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3645#ifdef CONFIG_IPV6_ROUTER_PREF
3646        array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3647        array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3648#ifdef CONFIG_IPV6_ROUTE_INFO
3649        array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3650#endif
3651#endif
3652        array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3653        array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3654#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3655        array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3656#endif
3657#ifdef CONFIG_IPV6_MROUTE
3658        array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3659#endif
3660        array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3661        array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3662}
3663
3664static inline size_t inet6_if_nlmsg_size(void)
3665{
3666        return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3667               + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3668               + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3669               + nla_total_size(4) /* IFLA_MTU */
3670               + nla_total_size(4) /* IFLA_LINK */
3671               + nla_total_size( /* IFLA_PROTINFO */
3672                        nla_total_size(4) /* IFLA_INET6_FLAGS */
3673                        + nla_total_size(sizeof(struct ifla_cacheinfo))
3674                        + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3675                        + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3676                        + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3677                 );
3678}
3679
3680static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3681                                      int bytes)
3682{
3683        int i;
3684        int pad = bytes - sizeof(u64) * items;
3685        BUG_ON(pad < 0);
3686
3687        /* Use put_unaligned() because stats may not be aligned for u64. */
3688        put_unaligned(items, &stats[0]);
3689        for (i = 1; i < items; i++)
3690                put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3691
3692        memset(&stats[items], 0, pad);
3693}
3694
3695static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3696                             int bytes)
3697{
3698        switch(attrtype) {
3699        case IFLA_INET6_STATS:
3700                __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3701                break;
3702        case IFLA_INET6_ICMP6STATS:
3703                __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3704                break;
3705        }
3706}
3707
3708static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3709                             u32 pid, u32 seq, int event, unsigned int flags)
3710{
3711        struct net_device *dev = idev->dev;
3712        struct nlattr *nla;
3713        struct ifinfomsg *hdr;
3714        struct nlmsghdr *nlh;
3715        void *protoinfo;
3716        struct ifla_cacheinfo ci;
3717
3718        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3719        if (nlh == NULL)
3720                return -EMSGSIZE;
3721
3722        hdr = nlmsg_data(nlh);
3723        hdr->ifi_family = AF_INET6;
3724        hdr->__ifi_pad = 0;
3725        hdr->ifi_type = dev->type;
3726        hdr->ifi_index = dev->ifindex;
3727        hdr->ifi_flags = dev_get_flags(dev);
3728        hdr->ifi_change = 0;
3729
3730        NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3731
3732        if (dev->addr_len)
3733                NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3734
3735        NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3736        if (dev->ifindex != dev->iflink)
3737                NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3738
3739        protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3740        if (protoinfo == NULL)
3741                goto nla_put_failure;
3742
3743        NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3744
3745        ci.max_reasm_len = IPV6_MAXPLEN;
3746        ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3747                    + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3748        ci.reachable_time = idev->nd_parms->reachable_time;
3749        ci.retrans_time = idev->nd_parms->retrans_time;
3750        NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3751
3752        nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3753        if (nla == NULL)
3754                goto nla_put_failure;
3755        ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3756
3757        /* XXX - MC not implemented */
3758
3759        nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3760        if (nla == NULL)
3761                goto nla_put_failure;
3762        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3763
3764        nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3765        if (nla == NULL)
3766                goto nla_put_failure;
3767        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3768
3769        nla_nest_end(skb, protoinfo);
3770        return nlmsg_end(skb, nlh);
3771
3772nla_put_failure:
3773        nlmsg_cancel(skb, nlh);
3774        return -EMSGSIZE;
3775}
3776
3777static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3778{
3779        struct net *net = sock_net(skb->sk);
3780        int idx, err;
3781        int s_idx = cb->args[0];
3782        struct net_device *dev;
3783        struct inet6_dev *idev;
3784
3785        read_lock(&dev_base_lock);
3786        idx = 0;
3787        for_each_netdev(net, dev) {
3788                if (idx < s_idx)
3789                        goto cont;
3790                if ((idev = in6_dev_get(dev)) == NULL)
3791                        goto cont;
3792                err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3793                                cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3794                in6_dev_put(idev);
3795                if (err <= 0)
3796                        break;
3797cont:
3798                idx++;
3799        }
3800        read_unlock(&dev_base_lock);
3801        cb->args[0] = idx;
3802
3803        return skb->len;
3804}
3805
3806void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3807{
3808        struct sk_buff *skb;
3809        struct net *net = dev_net(idev->dev);
3810        int err = -ENOBUFS;
3811
3812        skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3813        if (skb == NULL)
3814                goto errout;
3815
3816        err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3817        if (err < 0) {
3818                /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3819                WARN_ON(err == -EMSGSIZE);
3820                kfree_skb(skb);
3821                goto errout;
3822        }
3823        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3824        return;
3825errout:
3826        if (err < 0)
3827                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3828}
3829
3830static inline size_t inet6_prefix_nlmsg_size(void)
3831{
3832        return NLMSG_ALIGN(sizeof(struct prefixmsg))
3833               + nla_total_size(sizeof(struct in6_addr))
3834               + nla_total_size(sizeof(struct prefix_cacheinfo));
3835}
3836
3837static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3838                             struct prefix_info *pinfo, u32 pid, u32 seq,
3839                             int event, unsigned int flags)
3840{
3841        struct prefixmsg *pmsg;
3842        struct nlmsghdr *nlh;
3843        struct prefix_cacheinfo ci;
3844
3845        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3846        if (nlh == NULL)
3847                return -EMSGSIZE;
3848
3849        pmsg = nlmsg_data(nlh);
3850        pmsg->prefix_family = AF_INET6;
3851        pmsg->prefix_pad1 = 0;
3852        pmsg->prefix_pad2 = 0;
3853        pmsg->prefix_ifindex = idev->dev->ifindex;
3854        pmsg->prefix_len = pinfo->prefix_len;
3855        pmsg->prefix_type = pinfo->type;
3856        pmsg->prefix_pad3 = 0;
3857        pmsg->prefix_flags = 0;
3858        if (pinfo->onlink)
3859                pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3860        if (pinfo->autoconf)
3861                pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3862
3863        NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3864
3865        ci.preferred_time = ntohl(pinfo->prefered);
3866        ci.valid_time = ntohl(pinfo->valid);
3867        NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3868
3869        return nlmsg_end(skb, nlh);
3870
3871nla_put_failure:
3872        nlmsg_cancel(skb, nlh);
3873        return -EMSGSIZE;
3874}
3875
3876static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3877                         struct prefix_info *pinfo)
3878{
3879        struct sk_buff *skb;
3880        struct net *net = dev_net(idev->dev);
3881        int err = -ENOBUFS;
3882
3883        skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3884        if (skb == NULL)
3885                goto errout;
3886
3887        err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3888        if (err < 0) {
3889                /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3890                WARN_ON(err == -EMSGSIZE);
3891                kfree_skb(skb);
3892                goto errout;
3893        }
3894        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3895        return;
3896errout:
3897        if (err < 0)
3898                rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3899}
3900
3901static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3902{
3903        inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3904
3905        switch (event) {
3906        case RTM_NEWADDR:
3907                /*
3908                 * If the address was optimistic
3909                 * we inserted the route at the start of
3910                 * our DAD process, so we don't need
3911                 * to do it again
3912                 */
3913                if (!(ifp->rt->rt6i_node))
3914                        ip6_ins_rt(ifp->rt);
3915                if (ifp->idev->cnf.forwarding)
3916                        addrconf_join_anycast(ifp);
3917                break;
3918        case RTM_DELADDR:
3919                if (ifp->idev->cnf.forwarding)
3920                        addrconf_leave_anycast(ifp);
3921                addrconf_leave_solict(ifp->idev, &ifp->addr);
3922                dst_hold(&ifp->rt->u.dst);
3923                if (ip6_del_rt(ifp->rt))
3924                        dst_free(&ifp->rt->u.dst);
3925                break;
3926        }
3927}
3928
3929static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3930{
3931        rcu_read_lock_bh();
3932        if (likely(ifp->idev->dead == 0))
3933                __ipv6_ifa_notify(event, ifp);
3934        rcu_read_unlock_bh();
3935}
3936
3937#ifdef CONFIG_SYSCTL
3938
3939static
3940int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3941                           void __user *buffer, size_t *lenp, loff_t *ppos)
3942{
3943        int *valp = ctl->data;
3944        int val = *valp;
3945        int ret;
3946
3947        ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3948
3949        if (write)
3950                ret = addrconf_fixup_forwarding(ctl, valp, val);
3951        return ret;
3952}
3953
3954static int addrconf_sysctl_forward_strategy(ctl_table *table,
3955                                            void __user *oldval,
3956                                            size_t __user *oldlenp,
3957                                            void __user *newval, size_t newlen)
3958{
3959        int *valp = table->data;
3960        int val = *valp;
3961        int new;
3962
3963        if (!newval || !newlen)
3964                return 0;
3965        if (newlen != sizeof(int))
3966                return -EINVAL;
3967        if (get_user(new, (int __user *)newval))
3968                return -EFAULT;
3969        if (new == *valp)
3970                return 0;
3971        if (oldval && oldlenp) {
3972                size_t len;
3973                if (get_user(len, oldlenp))
3974                        return -EFAULT;
3975                if (len) {
3976                        if (len > table->maxlen)
3977                                len = table->maxlen;
3978                        if (copy_to_user(oldval, valp, len))
3979                                return -EFAULT;
3980                        if (put_user(len, oldlenp))
3981                                return -EFAULT;
3982                }
3983        }
3984
3985        *valp = new;
3986        return addrconf_fixup_forwarding(table, valp, val);
3987}
3988
3989static struct addrconf_sysctl_table
3990{
3991        struct ctl_table_header *sysctl_header;
3992        ctl_table addrconf_vars[DEVCONF_MAX+1];
3993        char *dev_name;
3994} addrconf_sysctl __read_mostly = {
3995        .sysctl_header = NULL,
3996        .addrconf_vars = {
3997                {
3998                        .ctl_name       =       NET_IPV6_FORWARDING,
3999                        .procname       =       "forwarding",
4000                        .data           =       &ipv6_devconf.forwarding,
4001                        .maxlen         =       sizeof(int),
4002                        .mode           =       0644,
4003                        .proc_handler   =       addrconf_sysctl_forward,
4004                        .strategy       =       addrconf_sysctl_forward_strategy,
4005                },
4006                {
4007                        .ctl_name       =       NET_IPV6_HOP_LIMIT,
4008                        .procname       =       "hop_limit",
4009                        .data           =       &ipv6_devconf.hop_limit,
4010                        .maxlen         =       sizeof(int),
4011                        .mode           =       0644,
4012                        .proc_handler   =       proc_dointvec,
4013                },
4014                {
4015                        .ctl_name       =       NET_IPV6_MTU,
4016                        .procname       =       "mtu",
4017                        .data           =       &ipv6_devconf.mtu6,
4018                        .maxlen         =       sizeof(int),
4019                        .mode           =       0644,
4020                        .proc_handler   =       proc_dointvec,
4021                },
4022                {
4023                        .ctl_name       =       NET_IPV6_ACCEPT_RA,
4024                        .procname       =       "accept_ra",
4025                        .data           =       &ipv6_devconf.accept_ra,
4026                        .maxlen         =       sizeof(int),
4027                        .mode           =       0644,
4028                        .proc_handler   =       proc_dointvec,
4029                },
4030                {
4031                        .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
4032                        .procname       =       "accept_redirects",
4033                        .data           =       &ipv6_devconf.accept_redirects,
4034                        .maxlen         =       sizeof(int),
4035                        .mode           =       0644,
4036                        .proc_handler   =       proc_dointvec,
4037                },
4038                {
4039                        .ctl_name       =       NET_IPV6_AUTOCONF,
4040                        .procname       =       "autoconf",
4041                        .data           =       &ipv6_devconf.autoconf,
4042                        .maxlen         =       sizeof(int),
4043                        .mode           =       0644,
4044                        .proc_handler   =       proc_dointvec,
4045                },
4046                {
4047                        .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
4048                        .procname       =       "dad_transmits",
4049                        .data           =       &ipv6_devconf.dad_transmits,
4050                        .maxlen         =       sizeof(int),
4051                        .mode           =       0644,
4052                        .proc_handler   =       proc_dointvec,
4053                },
4054                {
4055                        .ctl_name       =       NET_IPV6_RTR_SOLICITS,
4056                        .procname       =       "router_solicitations",
4057                        .data           =       &ipv6_devconf.rtr_solicits,
4058                        .maxlen         =       sizeof(int),
4059                        .mode           =       0644,
4060                        .proc_handler   =       proc_dointvec,
4061                },
4062                {
4063                        .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
4064                        .procname       =       "router_solicitation_interval",
4065                        .data           =       &ipv6_devconf.rtr_solicit_interval,
4066                        .maxlen         =       sizeof(int),
4067                        .mode           =       0644,
4068                        .proc_handler   =       proc_dointvec_jiffies,
4069                        .strategy       =       sysctl_jiffies,
4070                },
4071                {
4072                        .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
4073                        .procname       =       "router_solicitation_delay",
4074                        .data           =       &ipv6_devconf.rtr_solicit_delay,
4075                        .maxlen         =       sizeof(int),
4076                        .mode           =       0644,
4077                        .proc_handler   =       proc_dointvec_jiffies,
4078                        .strategy       =       sysctl_jiffies,
4079                },
4080                {
4081                        .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
4082                        .procname       =       "force_mld_version",
4083                        .data           =       &ipv6_devconf.force_mld_version,
4084                        .maxlen         =       sizeof(int),
4085                        .mode           =       0644,
4086                        .proc_handler   =       proc_dointvec,
4087                },
4088#ifdef CONFIG_IPV6_PRIVACY
4089                {
4090                        .ctl_name       =       NET_IPV6_USE_TEMPADDR,
4091                        .procname       =       "use_tempaddr",
4092                        .data           =       &ipv6_devconf.use_tempaddr,
4093                        .maxlen         =       sizeof(int),
4094                        .mode           =       0644,
4095                        .proc_handler   =       proc_dointvec,
4096                },
4097                {
4098                        .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
4099                        .procname       =       "temp_valid_lft",
4100                        .data           =       &ipv6_devconf.temp_valid_lft,
4101                        .maxlen         =       sizeof(int),
4102                        .mode           =       0644,
4103                        .proc_handler   =       proc_dointvec,
4104                },
4105                {
4106                        .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4107                        .procname       =       "temp_prefered_lft",
4108                        .data           =       &ipv6_devconf.temp_prefered_lft,
4109                        .maxlen         =       sizeof(int),
4110                        .mode           =       0644,
4111                        .proc_handler   =       proc_dointvec,
4112                },
4113                {
4114                        .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4115                        .procname       =       "regen_max_retry",
4116                        .data           =       &ipv6_devconf.regen_max_retry,
4117                        .maxlen         =       sizeof(int),
4118                        .mode           =       0644,
4119                        .proc_handler   =       proc_dointvec,
4120                },
4121                {
4122                        .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4123                        .procname       =       "max_desync_factor",
4124                        .data           =       &ipv6_devconf.max_desync_factor,
4125                        .maxlen         =       sizeof(int),
4126                        .mode           =       0644,
4127                        .proc_handler   =       proc_dointvec,
4128                },
4129#endif
4130                {
4131                        .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4132                        .procname       =       "max_addresses",
4133                        .data           =       &ipv6_devconf.max_addresses,
4134                        .maxlen         =       sizeof(int),
4135                        .mode           =       0644,
4136                        .proc_handler   =       proc_dointvec,
4137                },
4138                {
4139                        .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4140                        .procname       =       "accept_ra_defrtr",
4141                        .data           =       &ipv6_devconf.accept_ra_defrtr,
4142                        .maxlen         =       sizeof(int),
4143                        .mode           =       0644,
4144                        .proc_handler   =       proc_dointvec,
4145                },
4146                {
4147                        .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4148                        .procname       =       "accept_ra_pinfo",
4149                        .data           =       &ipv6_devconf.accept_ra_pinfo,
4150                        .maxlen         =       sizeof(int),
4151                        .mode           =       0644,
4152                        .proc_handler   =       proc_dointvec,
4153                },
4154#ifdef CONFIG_IPV6_ROUTER_PREF
4155                {
4156                        .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4157                        .procname       =       "accept_ra_rtr_pref",
4158                        .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4159                        .maxlen         =       sizeof(int),
4160                        .mode           =       0644,
4161                        .proc_handler   =       proc_dointvec,
4162                },
4163                {
4164                        .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4165                        .procname       =       "router_probe_interval",
4166                        .data           =       &ipv6_devconf.rtr_probe_interval,
4167                        .maxlen         =       sizeof(int),
4168                        .mode           =       0644,
4169                        .proc_handler   =       proc_dointvec_jiffies,
4170                        .strategy       =       sysctl_jiffies,
4171                },
4172#ifdef CONFIG_IPV6_ROUTE_INFO
4173                {
4174                        .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4175                        .procname       =       "accept_ra_rt_info_max_plen",
4176                        .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4177                        .maxlen         =       sizeof(int),
4178                        .mode           =       0644,
4179                        .proc_handler   =       proc_dointvec,
4180                },
4181#endif
4182#endif
4183                {
4184                        .ctl_name       =       NET_IPV6_PROXY_NDP,
4185                        .procname       =       "proxy_ndp",
4186                        .data           =       &ipv6_devconf.proxy_ndp,
4187                        .maxlen         =       sizeof(int),
4188                        .mode           =       0644,
4189                        .proc_handler   =       proc_dointvec,
4190                },
4191                {
4192                        .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4193                        .procname       =       "accept_source_route",
4194                        .data           =       &ipv6_devconf.accept_source_route,
4195                        .maxlen         =       sizeof(int),
4196                        .mode           =       0644,
4197                        .proc_handler   =       proc_dointvec,
4198                },
4199#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4200                {
4201                        .ctl_name       =       CTL_UNNUMBERED,
4202                        .procname       =       "optimistic_dad",
4203                        .data           =       &ipv6_devconf.optimistic_dad,
4204                        .maxlen         =       sizeof(int),
4205                        .mode           =       0644,
4206                        .proc_handler   =       proc_dointvec,
4207
4208                },
4209#endif
4210#ifdef CONFIG_IPV6_MROUTE
4211                {
4212                        .ctl_name       =       CTL_UNNUMBERED,
4213                        .procname       =       "mc_forwarding",
4214                        .data           =       &ipv6_devconf.mc_forwarding,
4215                        .maxlen         =       sizeof(int),
4216                        .mode           =       0444,
4217                        .proc_handler   =       proc_dointvec,
4218                },
4219#endif
4220                {
4221                        .ctl_name       =       CTL_UNNUMBERED,
4222                        .procname       =       "disable_ipv6",
4223                        .data           =       &ipv6_devconf.disable_ipv6,
4224                        .maxlen         =       sizeof(int),
4225                        .mode           =       0644,
4226                        .proc_handler   =       proc_dointvec,
4227                },
4228                {
4229                        .ctl_name       =       CTL_UNNUMBERED,
4230                        .procname       =       "accept_dad",
4231                        .data           =       &ipv6_devconf.accept_dad,
4232                        .maxlen         =       sizeof(int),
4233                        .mode           =       0644,
4234                        .proc_handler   =       proc_dointvec,
4235                },
4236                {
4237                        .ctl_name       =       0,      /* sentinel */
4238                }
4239        },
4240};
4241
4242static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4243                int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4244{
4245        int i;
4246        struct addrconf_sysctl_table *t;
4247
4248#define ADDRCONF_CTL_PATH_DEV   3
4249
4250        struct ctl_path addrconf_ctl_path[] = {
4251                { .procname = "net", .ctl_name = CTL_NET, },
4252                { .procname = "ipv6", .ctl_name = NET_IPV6, },
4253                { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4254                { /* to be set */ },
4255                { },
4256        };
4257
4258
4259        t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4260        if (t == NULL)
4261                goto out;
4262
4263        for (i=0; t->addrconf_vars[i].data; i++) {
4264                t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4265                t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4266                t->addrconf_vars[i].extra2 = net;
4267        }
4268
4269        /*
4270         * Make a copy of dev_name, because '.procname' is regarded as const
4271         * by sysctl and we wouldn't want anyone to change it under our feet
4272         * (see SIOCSIFNAME).
4273         */
4274        t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4275        if (!t->dev_name)
4276                goto free;
4277
4278        addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4279        addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4280
4281        t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4282                        t->addrconf_vars);
4283        if (t->sysctl_header == NULL)
4284                goto free_procname;
4285
4286        p->sysctl = t;
4287        return 0;
4288
4289free_procname:
4290        kfree(t->dev_name);
4291free:
4292        kfree(t);
4293out:
4294        return -ENOBUFS;
4295}
4296
4297static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4298{
4299        struct addrconf_sysctl_table *t;
4300
4301        if (p->sysctl == NULL)
4302                return;
4303
4304        t = p->sysctl;
4305        p->sysctl = NULL;
4306        unregister_sysctl_table(t->sysctl_header);
4307        kfree(t->dev_name);
4308        kfree(t);
4309}
4310
4311static void addrconf_sysctl_register(struct inet6_dev *idev)
4312{
4313        neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4314                              NET_IPV6_NEIGH, "ipv6",
4315                              &ndisc_ifinfo_sysctl_change,
4316                              ndisc_ifinfo_sysctl_strategy);
4317        __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4318                        idev->dev->ifindex, idev, &idev->cnf);
4319}
4320
4321static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4322{
4323        __addrconf_sysctl_unregister(&idev->cnf);
4324        neigh_sysctl_unregister(idev->nd_parms);
4325}
4326
4327
4328#endif
4329
4330static int addrconf_init_net(struct net *net)
4331{
4332        int err;
4333        struct ipv6_devconf *all, *dflt;
4334
4335        err = -ENOMEM;
4336        all = &ipv6_devconf;
4337        dflt = &ipv6_devconf_dflt;
4338
4339        if (net != &init_net) {
4340                all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4341                if (all == NULL)
4342                        goto err_alloc_all;
4343
4344                dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4345                if (dflt == NULL)
4346                        goto err_alloc_dflt;
4347        }
4348
4349        net->ipv6.devconf_all = all;
4350        net->ipv6.devconf_dflt = dflt;
4351
4352#ifdef CONFIG_SYSCTL
4353        err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4354                        NULL, all);
4355        if (err < 0)
4356                goto err_reg_all;
4357
4358        err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4359                        NULL, dflt);
4360        if (err < 0)
4361                goto err_reg_dflt;
4362#endif
4363        return 0;
4364
4365#ifdef CONFIG_SYSCTL
4366err_reg_dflt:
4367        __addrconf_sysctl_unregister(all);
4368err_reg_all:
4369        kfree(dflt);
4370#endif
4371err_alloc_dflt:
4372        kfree(all);
4373err_alloc_all:
4374        return err;
4375}
4376
4377static void addrconf_exit_net(struct net *net)
4378{
4379#ifdef CONFIG_SYSCTL
4380        __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4381        __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4382#endif
4383        if (net != &init_net) {
4384                kfree(net->ipv6.devconf_dflt);
4385                kfree(net->ipv6.devconf_all);
4386        }
4387}
4388
4389static struct pernet_operations addrconf_ops = {
4390        .init = addrconf_init_net,
4391        .exit = addrconf_exit_net,
4392};
4393
4394/*
4395 *      Device notifier
4396 */
4397
4398int register_inet6addr_notifier(struct notifier_block *nb)
4399{
4400        return atomic_notifier_chain_register(&inet6addr_chain, nb);
4401}
4402
4403EXPORT_SYMBOL(register_inet6addr_notifier);
4404
4405int unregister_inet6addr_notifier(struct notifier_block *nb)
4406{
4407        return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4408}
4409
4410EXPORT_SYMBOL(unregister_inet6addr_notifier);
4411
4412/*
4413 *      Init / cleanup code
4414 */
4415
4416int __init addrconf_init(void)
4417{
4418        int err;
4419
4420        if ((err = ipv6_addr_label_init()) < 0) {
4421                printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4422                        err);
4423                return err;
4424        }
4425
4426        register_pernet_subsys(&addrconf_ops);
4427
4428        /* The addrconf netdev notifier requires that loopback_dev
4429         * has it's ipv6 private information allocated and setup
4430         * before it can bring up and give link-local addresses
4431         * to other devices which are up.
4432         *
4433         * Unfortunately, loopback_dev is not necessarily the first
4434         * entry in the global dev_base list of net devices.  In fact,
4435         * it is likely to be the very last entry on that list.
4436         * So this causes the notifier registry below to try and
4437         * give link-local addresses to all devices besides loopback_dev
4438         * first, then loopback_dev, which cases all the non-loopback_dev
4439         * devices to fail to get a link-local address.
4440         *
4441         * So, as a temporary fix, allocate the ipv6 structure for
4442         * loopback_dev first by hand.
4443         * Longer term, all of the dependencies ipv6 has upon the loopback
4444         * device and it being up should be removed.
4445         */
4446        rtnl_lock();
4447        if (!ipv6_add_dev(init_net.loopback_dev))
4448                err = -ENOMEM;
4449        rtnl_unlock();
4450        if (err)
4451                goto errlo;
4452
4453        register_netdevice_notifier(&ipv6_dev_notf);
4454
4455        addrconf_verify(0);
4456
4457        err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4458        if (err < 0)
4459                goto errout;
4460
4461        /* Only the first call to __rtnl_register can fail */
4462        __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4463        __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4464        __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4465        __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4466        __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4467
4468        ipv6_addr_label_rtnl_register();
4469
4470        return 0;
4471errout:
4472        unregister_netdevice_notifier(&ipv6_dev_notf);
4473errlo:
4474        unregister_pernet_subsys(&addrconf_ops);
4475
4476        return err;
4477}
4478
4479void addrconf_cleanup(void)
4480{
4481        struct inet6_ifaddr *ifa;
4482        struct net_device *dev;
4483        int i;
4484
4485        unregister_netdevice_notifier(&ipv6_dev_notf);
4486        unregister_pernet_subsys(&addrconf_ops);
4487
4488        rtnl_lock();
4489
4490        /* clean dev list */
4491        for_each_netdev(&init_net, dev) {
4492                if (__in6_dev_get(dev) == NULL)
4493                        continue;
4494                addrconf_ifdown(dev, 1);
4495        }
4496        addrconf_ifdown(init_net.loopback_dev, 2);
4497
4498        /*
4499         *      Check hash table.
4500         */
4501        write_lock_bh(&addrconf_hash_lock);
4502        for (i=0; i < IN6_ADDR_HSIZE; i++) {
4503                for (ifa=inet6_addr_lst[i]; ifa; ) {
4504                        struct inet6_ifaddr *bifa;
4505
4506                        bifa = ifa;
4507                        ifa = ifa->lst_next;
4508                        printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4509                        /* Do not free it; something is wrong.
4510                           Now we can investigate it with debugger.
4511                         */
4512                }
4513        }
4514        write_unlock_bh(&addrconf_hash_lock);
4515
4516        del_timer(&addr_chk_timer);
4517        rtnl_unlock();
4518}
4519