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 void addrconf_bonding_change(struct net_device *dev,
 141                                    unsigned long event);
 142static int addrconf_ifdown(struct net_device *dev, int how);
 143
 144static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 145static void addrconf_dad_timer(unsigned long data);
 146static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 147static void addrconf_dad_run(struct inet6_dev *idev);
 148static void addrconf_rs_timer(unsigned long data);
 149static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 150static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 151
 152static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 153                                struct prefix_info *pinfo);
 154static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 155                              struct net_device *dev);
 156
 157static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 158
 159static struct ipv6_devconf ipv6_devconf __read_mostly = {
 160        .forwarding             = 0,
 161        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 162        .mtu6                   = IPV6_MIN_MTU,
 163        .accept_ra              = 1,
 164        .accept_redirects       = 1,
 165        .autoconf               = 1,
 166        .force_mld_version      = 0,
 167        .dad_transmits          = 1,
 168        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 169        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 170        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 171#ifdef CONFIG_IPV6_PRIVACY
 172        .use_tempaddr           = 0,
 173        .temp_valid_lft         = TEMP_VALID_LIFETIME,
 174        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 175        .regen_max_retry        = REGEN_MAX_RETRY,
 176        .max_desync_factor      = MAX_DESYNC_FACTOR,
 177#endif
 178        .max_addresses          = IPV6_MAX_ADDRESSES,
 179        .accept_ra_defrtr       = 1,
 180        .accept_ra_pinfo        = 1,
 181#ifdef CONFIG_IPV6_ROUTER_PREF
 182        .accept_ra_rtr_pref     = 1,
 183        .rtr_probe_interval     = 60 * HZ,
 184#ifdef CONFIG_IPV6_ROUTE_INFO
 185        .accept_ra_rt_info_max_plen = 0,
 186#endif
 187#endif
 188        .proxy_ndp              = 0,
 189        .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 190        .disable_ipv6           = 0,
 191        .accept_dad             = 1,
 192};
 193
 194static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 195        .forwarding             = 0,
 196        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 197        .mtu6                   = IPV6_MIN_MTU,
 198        .accept_ra              = 1,
 199        .accept_redirects       = 1,
 200        .autoconf               = 1,
 201        .dad_transmits          = 1,
 202        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 203        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 204        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 205#ifdef CONFIG_IPV6_PRIVACY
 206        .use_tempaddr           = 0,
 207        .temp_valid_lft         = TEMP_VALID_LIFETIME,
 208        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 209        .regen_max_retry        = REGEN_MAX_RETRY,
 210        .max_desync_factor      = MAX_DESYNC_FACTOR,
 211#endif
 212        .max_addresses          = IPV6_MAX_ADDRESSES,
 213        .accept_ra_defrtr       = 1,
 214        .accept_ra_pinfo        = 1,
 215#ifdef CONFIG_IPV6_ROUTER_PREF
 216        .accept_ra_rtr_pref     = 1,
 217        .rtr_probe_interval     = 60 * HZ,
 218#ifdef CONFIG_IPV6_ROUTE_INFO
 219        .accept_ra_rt_info_max_plen = 0,
 220#endif
 221#endif
 222        .proxy_ndp              = 0,
 223        .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 224        .disable_ipv6           = 0,
 225        .accept_dad             = 1,
 226};
 227
 228/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 229const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 230const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 231const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 232const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 233
 234/* Check if a valid qdisc is available */
 235static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 236{
 237        return !qdisc_tx_is_noop(dev);
 238}
 239
 240/* Check if a route is valid prefix route */
 241static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 242{
 243        return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
 244}
 245
 246static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 247{
 248        if (del_timer(&ifp->timer))
 249                __in6_ifa_put(ifp);
 250}
 251
 252enum addrconf_timer_t
 253{
 254        AC_NONE,
 255        AC_DAD,
 256        AC_RS,
 257};
 258
 259static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 260                               enum addrconf_timer_t what,
 261                               unsigned long when)
 262{
 263        if (!del_timer(&ifp->timer))
 264                in6_ifa_hold(ifp);
 265
 266        switch (what) {
 267        case AC_DAD:
 268                ifp->timer.function = addrconf_dad_timer;
 269                break;
 270        case AC_RS:
 271                ifp->timer.function = addrconf_rs_timer;
 272                break;
 273        default:;
 274        }
 275        ifp->timer.expires = jiffies + when;
 276        add_timer(&ifp->timer);
 277}
 278
 279static int snmp6_alloc_dev(struct inet6_dev *idev)
 280{
 281        if (snmp_mib_init((void **)idev->stats.ipv6,
 282                          sizeof(struct ipstats_mib)) < 0)
 283                goto err_ip;
 284        if (snmp_mib_init((void **)idev->stats.icmpv6,
 285                          sizeof(struct icmpv6_mib)) < 0)
 286                goto err_icmp;
 287        if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 288                          sizeof(struct icmpv6msg_mib)) < 0)
 289                goto err_icmpmsg;
 290
 291        return 0;
 292
 293err_icmpmsg:
 294        snmp_mib_free((void **)idev->stats.icmpv6);
 295err_icmp:
 296        snmp_mib_free((void **)idev->stats.ipv6);
 297err_ip:
 298        return -ENOMEM;
 299}
 300
 301static void snmp6_free_dev(struct inet6_dev *idev)
 302{
 303        snmp_mib_free((void **)idev->stats.icmpv6msg);
 304        snmp_mib_free((void **)idev->stats.icmpv6);
 305        snmp_mib_free((void **)idev->stats.ipv6);
 306}
 307
 308/* Nobody refers to this device, we may destroy it. */
 309
 310static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 311{
 312        struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 313        kfree(idev);
 314}
 315
 316void in6_dev_finish_destroy(struct inet6_dev *idev)
 317{
 318        struct net_device *dev = idev->dev;
 319
 320        WARN_ON(idev->addr_list != NULL);
 321        WARN_ON(idev->mc_list != NULL);
 322
 323#ifdef NET_REFCNT_DEBUG
 324        printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 325#endif
 326        dev_put(dev);
 327        if (!idev->dead) {
 328                printk("Freeing alive inet6 device %p\n", idev);
 329                return;
 330        }
 331        snmp6_free_dev(idev);
 332        call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 333}
 334
 335EXPORT_SYMBOL(in6_dev_finish_destroy);
 336
 337static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 338{
 339        struct inet6_dev *ndev;
 340
 341        ASSERT_RTNL();
 342
 343        if (dev->mtu < IPV6_MIN_MTU)
 344                return NULL;
 345
 346        ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 347
 348        if (ndev == NULL)
 349                return NULL;
 350
 351        rwlock_init(&ndev->lock);
 352        ndev->dev = dev;
 353        memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 354        ndev->cnf.mtu6 = dev->mtu;
 355        ndev->cnf.sysctl = NULL;
 356        ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 357        if (ndev->nd_parms == NULL) {
 358                kfree(ndev);
 359                return NULL;
 360        }
 361        if (ndev->cnf.forwarding)
 362                dev_disable_lro(dev);
 363        /* We refer to the device */
 364        dev_hold(dev);
 365
 366        if (snmp6_alloc_dev(ndev) < 0) {
 367                ADBG((KERN_WARNING
 368                        "%s(): cannot allocate memory for statistics; dev=%s.\n",
 369                        __func__, dev->name));
 370                neigh_parms_release(&nd_tbl, ndev->nd_parms);
 371                ndev->dead = 1;
 372                in6_dev_finish_destroy(ndev);
 373                return NULL;
 374        }
 375
 376        if (snmp6_register_dev(ndev) < 0) {
 377                ADBG((KERN_WARNING
 378                        "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 379                        __func__, dev->name));
 380                neigh_parms_release(&nd_tbl, ndev->nd_parms);
 381                ndev->dead = 1;
 382                in6_dev_finish_destroy(ndev);
 383                return NULL;
 384        }
 385
 386        /* One reference from device.  We must do this before
 387         * we invoke __ipv6_regen_rndid().
 388         */
 389        in6_dev_hold(ndev);
 390
 391        if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 392                ndev->cnf.accept_dad = -1;
 393
 394#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 395        if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 396                printk(KERN_INFO
 397                       "%s: Disabled Multicast RS\n",
 398                       dev->name);
 399                ndev->cnf.rtr_solicits = 0;
 400        }
 401#endif
 402
 403#ifdef CONFIG_IPV6_PRIVACY
 404        setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 405        if ((dev->flags&IFF_LOOPBACK) ||
 406            dev->type == ARPHRD_TUNNEL ||
 407            dev->type == ARPHRD_TUNNEL6 ||
 408            dev->type == ARPHRD_SIT ||
 409            dev->type == ARPHRD_NONE) {
 410                printk(KERN_INFO
 411                       "%s: Disabled Privacy Extensions\n",
 412                       dev->name);
 413                ndev->cnf.use_tempaddr = -1;
 414        } else {
 415                in6_dev_hold(ndev);
 416                ipv6_regen_rndid((unsigned long) ndev);
 417        }
 418#endif
 419
 420        if (netif_running(dev) && addrconf_qdisc_ok(dev))
 421                ndev->if_flags |= IF_READY;
 422
 423        ipv6_mc_init_dev(ndev);
 424        ndev->tstamp = jiffies;
 425        addrconf_sysctl_register(ndev);
 426        /* protected by rtnl_lock */
 427        rcu_assign_pointer(dev->ip6_ptr, ndev);
 428
 429        /* Join all-node multicast group */
 430        ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 431
 432        return ndev;
 433}
 434
 435static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 436{
 437        struct inet6_dev *idev;
 438
 439        ASSERT_RTNL();
 440
 441        if ((idev = __in6_dev_get(dev)) == NULL) {
 442                if ((idev = ipv6_add_dev(dev)) == NULL)
 443                        return NULL;
 444        }
 445
 446        if (dev->flags&IFF_UP)
 447                ipv6_mc_up(idev);
 448        return idev;
 449}
 450
 451#ifdef CONFIG_SYSCTL
 452static void dev_forward_change(struct inet6_dev *idev)
 453{
 454        struct net_device *dev;
 455        struct inet6_ifaddr *ifa;
 456
 457        if (!idev)
 458                return;
 459        dev = idev->dev;
 460        if (idev->cnf.forwarding)
 461                dev_disable_lro(dev);
 462        if (dev && (dev->flags & IFF_MULTICAST)) {
 463                if (idev->cnf.forwarding)
 464                        ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 465                else
 466                        ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 467        }
 468        for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 469                if (ifa->flags&IFA_F_TENTATIVE)
 470                        continue;
 471                if (idev->cnf.forwarding)
 472                        addrconf_join_anycast(ifa);
 473                else
 474                        addrconf_leave_anycast(ifa);
 475        }
 476}
 477
 478
 479static void addrconf_forward_change(struct net *net, __s32 newf)
 480{
 481        struct net_device *dev;
 482        struct inet6_dev *idev;
 483
 484        read_lock(&dev_base_lock);
 485        for_each_netdev(net, dev) {
 486                rcu_read_lock();
 487                idev = __in6_dev_get(dev);
 488                if (idev) {
 489                        int changed = (!idev->cnf.forwarding) ^ (!newf);
 490                        idev->cnf.forwarding = newf;
 491                        if (changed)
 492                                dev_forward_change(idev);
 493                }
 494                rcu_read_unlock();
 495        }
 496        read_unlock(&dev_base_lock);
 497}
 498
 499static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 500{
 501        struct net *net;
 502
 503        net = (struct net *)table->extra2;
 504        if (p == &net->ipv6.devconf_dflt->forwarding)
 505                return 0;
 506
 507        if (!rtnl_trylock())
 508                return restart_syscall();
 509
 510        if (p == &net->ipv6.devconf_all->forwarding) {
 511                __s32 newf = net->ipv6.devconf_all->forwarding;
 512                net->ipv6.devconf_dflt->forwarding = newf;
 513                addrconf_forward_change(net, newf);
 514        } else if ((!*p) ^ (!old))
 515                dev_forward_change((struct inet6_dev *)table->extra1);
 516        rtnl_unlock();
 517
 518        if (*p)
 519                rt6_purge_dflt_routers(net);
 520        return 1;
 521}
 522#endif
 523
 524/* Nobody refers to this ifaddr, destroy it */
 525
 526void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 527{
 528        WARN_ON(ifp->if_next != NULL);
 529        WARN_ON(ifp->lst_next != NULL);
 530
 531#ifdef NET_REFCNT_DEBUG
 532        printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 533#endif
 534
 535        in6_dev_put(ifp->idev);
 536
 537        if (del_timer(&ifp->timer))
 538                printk("Timer is still running, when freeing ifa=%p\n", ifp);
 539
 540        if (!ifp->dead) {
 541                printk("Freeing alive inet6 address %p\n", ifp);
 542                return;
 543        }
 544        dst_release(&ifp->rt->u.dst);
 545
 546        kfree(ifp);
 547}
 548
 549static void
 550ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 551{
 552        struct inet6_ifaddr *ifa, **ifap;
 553        int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 554
 555        /*
 556         * Each device address list is sorted in order of scope -
 557         * global before linklocal.
 558         */
 559        for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 560             ifap = &ifa->if_next) {
 561                if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 562                        break;
 563        }
 564
 565        ifp->if_next = *ifap;
 566        *ifap = ifp;
 567}
 568
 569/*
 570 *      Hash function taken from net_alias.c
 571 */
 572static u8 ipv6_addr_hash(const struct in6_addr *addr)
 573{
 574        __u32 word;
 575
 576        /*
 577         * We perform the hash function over the last 64 bits of the address
 578         * This will include the IEEE address token on links that support it.
 579         */
 580
 581        word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
 582        word ^= (word >> 16);
 583        word ^= (word >> 8);
 584
 585        return ((word ^ (word >> 4)) & 0x0f);
 586}
 587
 588/* On success it returns ifp with increased reference count */
 589
 590static struct inet6_ifaddr *
 591ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 592              int scope, u32 flags)
 593{
 594        struct inet6_ifaddr *ifa = NULL;
 595        struct rt6_info *rt;
 596        int hash;
 597        int err = 0;
 598        int addr_type = ipv6_addr_type(addr);
 599
 600        if (addr_type == IPV6_ADDR_ANY ||
 601            addr_type & IPV6_ADDR_MULTICAST ||
 602            (!(idev->dev->flags & IFF_LOOPBACK) &&
 603             addr_type & IPV6_ADDR_LOOPBACK))
 604                return ERR_PTR(-EADDRNOTAVAIL);
 605
 606        rcu_read_lock_bh();
 607        if (idev->dead) {
 608                err = -ENODEV;                  /*XXX*/
 609                goto out2;
 610        }
 611
 612        if (idev->cnf.disable_ipv6) {
 613                err = -EACCES;
 614                goto out2;
 615        }
 616
 617        write_lock(&addrconf_hash_lock);
 618
 619        /* Ignore adding duplicate addresses on an interface */
 620        if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 621                ADBG(("ipv6_add_addr: already assigned\n"));
 622                err = -EEXIST;
 623                goto out;
 624        }
 625
 626        ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 627
 628        if (ifa == NULL) {
 629                ADBG(("ipv6_add_addr: malloc failed\n"));
 630                err = -ENOBUFS;
 631                goto out;
 632        }
 633
 634        rt = addrconf_dst_alloc(idev, addr, 0);
 635        if (IS_ERR(rt)) {
 636                err = PTR_ERR(rt);
 637                goto out;
 638        }
 639
 640        ipv6_addr_copy(&ifa->addr, addr);
 641
 642        spin_lock_init(&ifa->lock);
 643        init_timer(&ifa->timer);
 644        ifa->timer.data = (unsigned long) ifa;
 645        ifa->scope = scope;
 646        ifa->prefix_len = pfxlen;
 647        ifa->flags = flags | IFA_F_TENTATIVE;
 648        ifa->cstamp = ifa->tstamp = jiffies;
 649
 650        ifa->rt = rt;
 651
 652        /*
 653         * part one of RFC 4429, section 3.3
 654         * We should not configure an address as
 655         * optimistic if we do not yet know the link
 656         * layer address of our nexhop router
 657         */
 658
 659        if (rt->rt6i_nexthop == NULL)
 660                ifa->flags &= ~IFA_F_OPTIMISTIC;
 661
 662        ifa->idev = idev;
 663        in6_dev_hold(idev);
 664        /* For caller */
 665        in6_ifa_hold(ifa);
 666
 667        /* Add to big hash table */
 668        hash = ipv6_addr_hash(addr);
 669
 670        ifa->lst_next = inet6_addr_lst[hash];
 671        inet6_addr_lst[hash] = ifa;
 672        in6_ifa_hold(ifa);
 673        write_unlock(&addrconf_hash_lock);
 674
 675        write_lock(&idev->lock);
 676        /* Add to inet6_dev unicast addr list. */
 677        ipv6_link_dev_addr(idev, ifa);
 678
 679#ifdef CONFIG_IPV6_PRIVACY
 680        if (ifa->flags&IFA_F_TEMPORARY) {
 681                ifa->tmp_next = idev->tempaddr_list;
 682                idev->tempaddr_list = ifa;
 683                in6_ifa_hold(ifa);
 684        }
 685#endif
 686
 687        in6_ifa_hold(ifa);
 688        write_unlock(&idev->lock);
 689out2:
 690        rcu_read_unlock_bh();
 691
 692        if (likely(err == 0))
 693                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 694        else {
 695                kfree(ifa);
 696                ifa = ERR_PTR(err);
 697        }
 698
 699        return ifa;
 700out:
 701        write_unlock(&addrconf_hash_lock);
 702        goto out2;
 703}
 704
 705/* This function wants to get referenced ifp and releases it before return */
 706
 707static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 708{
 709        struct inet6_ifaddr *ifa, **ifap;
 710        struct inet6_dev *idev = ifp->idev;
 711        int hash;
 712        int deleted = 0, onlink = 0;
 713        unsigned long expires = jiffies;
 714
 715        hash = ipv6_addr_hash(&ifp->addr);
 716
 717        ifp->dead = 1;
 718
 719        write_lock_bh(&addrconf_hash_lock);
 720        for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 721             ifap = &ifa->lst_next) {
 722                if (ifa == ifp) {
 723                        *ifap = ifa->lst_next;
 724                        __in6_ifa_put(ifp);
 725                        ifa->lst_next = NULL;
 726                        break;
 727                }
 728        }
 729        write_unlock_bh(&addrconf_hash_lock);
 730
 731        write_lock_bh(&idev->lock);
 732#ifdef CONFIG_IPV6_PRIVACY
 733        if (ifp->flags&IFA_F_TEMPORARY) {
 734                for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 735                     ifap = &ifa->tmp_next) {
 736                        if (ifa == ifp) {
 737                                *ifap = ifa->tmp_next;
 738                                if (ifp->ifpub) {
 739                                        in6_ifa_put(ifp->ifpub);
 740                                        ifp->ifpub = NULL;
 741                                }
 742                                __in6_ifa_put(ifp);
 743                                ifa->tmp_next = NULL;
 744                                break;
 745                        }
 746                }
 747        }
 748#endif
 749
 750        for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 751                if (ifa == ifp) {
 752                        *ifap = ifa->if_next;
 753                        __in6_ifa_put(ifp);
 754                        ifa->if_next = NULL;
 755                        if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 756                                break;
 757                        deleted = 1;
 758                        continue;
 759                } else if (ifp->flags & IFA_F_PERMANENT) {
 760                        if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 761                                              ifp->prefix_len)) {
 762                                if (ifa->flags & IFA_F_PERMANENT) {
 763                                        onlink = 1;
 764                                        if (deleted)
 765                                                break;
 766                                } else {
 767                                        unsigned long lifetime;
 768
 769                                        if (!onlink)
 770                                                onlink = -1;
 771
 772                                        spin_lock(&ifa->lock);
 773
 774                                        lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 775                                        /*
 776                                         * Note: Because this address is
 777                                         * not permanent, lifetime <
 778                                         * LONG_MAX / HZ here.
 779                                         */
 780                                        if (time_before(expires,
 781                                                        ifa->tstamp + lifetime * HZ))
 782                                                expires = ifa->tstamp + lifetime * HZ;
 783                                        spin_unlock(&ifa->lock);
 784                                }
 785                        }
 786                }
 787                ifap = &ifa->if_next;
 788        }
 789        write_unlock_bh(&idev->lock);
 790
 791        addrconf_del_timer(ifp);
 792
 793        ipv6_ifa_notify(RTM_DELADDR, ifp);
 794
 795        atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 796
 797        /*
 798         * Purge or update corresponding prefix
 799         *
 800         * 1) we don't purge prefix here if address was not permanent.
 801         *    prefix is managed by its own lifetime.
 802         * 2) if there're no addresses, delete prefix.
 803         * 3) if there're still other permanent address(es),
 804         *    corresponding prefix is still permanent.
 805         * 4) otherwise, update prefix lifetime to the
 806         *    longest valid lifetime among the corresponding
 807         *    addresses on the device.
 808         *    Note: subsequent RA will update lifetime.
 809         *
 810         * --yoshfuji
 811         */
 812        if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 813                struct in6_addr prefix;
 814                struct rt6_info *rt;
 815                struct net *net = dev_net(ifp->idev->dev);
 816                ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 817                rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 818
 819                if (rt && addrconf_is_prefix_route(rt)) {
 820                        if (onlink == 0) {
 821                                ip6_del_rt(rt);
 822                                rt = NULL;
 823                        } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 824                                rt->rt6i_expires = expires;
 825                                rt->rt6i_flags |= RTF_EXPIRES;
 826                        }
 827                }
 828                dst_release(&rt->u.dst);
 829        }
 830
 831        in6_ifa_put(ifp);
 832}
 833
 834#ifdef CONFIG_IPV6_PRIVACY
 835static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 836{
 837        struct inet6_dev *idev = ifp->idev;
 838        struct in6_addr addr, *tmpaddr;
 839        unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 840        unsigned long regen_advance;
 841        int tmp_plen;
 842        int ret = 0;
 843        int max_addresses;
 844        u32 addr_flags;
 845
 846        write_lock(&idev->lock);
 847        if (ift) {
 848                spin_lock_bh(&ift->lock);
 849                memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 850                spin_unlock_bh(&ift->lock);
 851                tmpaddr = &addr;
 852        } else {
 853                tmpaddr = NULL;
 854        }
 855retry:
 856        in6_dev_hold(idev);
 857        if (idev->cnf.use_tempaddr <= 0) {
 858                write_unlock(&idev->lock);
 859                printk(KERN_INFO
 860                        "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 861                in6_dev_put(idev);
 862                ret = -1;
 863                goto out;
 864        }
 865        spin_lock_bh(&ifp->lock);
 866        if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 867                idev->cnf.use_tempaddr = -1;    /*XXX*/
 868                spin_unlock_bh(&ifp->lock);
 869                write_unlock(&idev->lock);
 870                printk(KERN_WARNING
 871                        "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 872                in6_dev_put(idev);
 873                ret = -1;
 874                goto out;
 875        }
 876        in6_ifa_hold(ifp);
 877        memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 878        if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 879                spin_unlock_bh(&ifp->lock);
 880                write_unlock(&idev->lock);
 881                printk(KERN_WARNING
 882                        "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 883                in6_ifa_put(ifp);
 884                in6_dev_put(idev);
 885                ret = -1;
 886                goto out;
 887        }
 888        memcpy(&addr.s6_addr[8], idev->rndid, 8);
 889        tmp_valid_lft = min_t(__u32,
 890                              ifp->valid_lft,
 891                              idev->cnf.temp_valid_lft);
 892        tmp_prefered_lft = min_t(__u32,
 893                                 ifp->prefered_lft,
 894                                 idev->cnf.temp_prefered_lft - desync_factor / HZ);
 895        tmp_plen = ifp->prefix_len;
 896        max_addresses = idev->cnf.max_addresses;
 897        tmp_cstamp = ifp->cstamp;
 898        tmp_tstamp = ifp->tstamp;
 899        spin_unlock_bh(&ifp->lock);
 900
 901        regen_advance = idev->cnf.regen_max_retry *
 902                        idev->cnf.dad_transmits *
 903                        idev->nd_parms->retrans_time / HZ;
 904        write_unlock(&idev->lock);
 905
 906        /* A temporary address is created only if this calculated Preferred
 907         * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 908         * an implementation must not create a temporary address with a zero
 909         * Preferred Lifetime.
 910         */
 911        if (tmp_prefered_lft <= regen_advance) {
 912                in6_ifa_put(ifp);
 913                in6_dev_put(idev);
 914                ret = -1;
 915                goto out;
 916        }
 917
 918        addr_flags = IFA_F_TEMPORARY;
 919        /* set in addrconf_prefix_rcv() */
 920        if (ifp->flags & IFA_F_OPTIMISTIC)
 921                addr_flags |= IFA_F_OPTIMISTIC;
 922
 923        ift = !max_addresses ||
 924              ipv6_count_addresses(idev) < max_addresses ?
 925                ipv6_add_addr(idev, &addr, tmp_plen,
 926                              ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 927                              addr_flags) : NULL;
 928        if (!ift || IS_ERR(ift)) {
 929                in6_ifa_put(ifp);
 930                in6_dev_put(idev);
 931                printk(KERN_INFO
 932                        "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 933                tmpaddr = &addr;
 934                write_lock(&idev->lock);
 935                goto retry;
 936        }
 937
 938        spin_lock_bh(&ift->lock);
 939        ift->ifpub = ifp;
 940        ift->valid_lft = tmp_valid_lft;
 941        ift->prefered_lft = tmp_prefered_lft;
 942        ift->cstamp = tmp_cstamp;
 943        ift->tstamp = tmp_tstamp;
 944        spin_unlock_bh(&ift->lock);
 945
 946        addrconf_dad_start(ift, 0);
 947        in6_ifa_put(ift);
 948        in6_dev_put(idev);
 949out:
 950        return ret;
 951}
 952#endif
 953
 954/*
 955 *      Choose an appropriate source address (RFC3484)
 956 */
 957enum {
 958        IPV6_SADDR_RULE_INIT = 0,
 959        IPV6_SADDR_RULE_LOCAL,
 960        IPV6_SADDR_RULE_SCOPE,
 961        IPV6_SADDR_RULE_PREFERRED,
 962#ifdef CONFIG_IPV6_MIP6
 963        IPV6_SADDR_RULE_HOA,
 964#endif
 965        IPV6_SADDR_RULE_OIF,
 966        IPV6_SADDR_RULE_LABEL,
 967#ifdef CONFIG_IPV6_PRIVACY
 968        IPV6_SADDR_RULE_PRIVACY,
 969#endif
 970        IPV6_SADDR_RULE_ORCHID,
 971        IPV6_SADDR_RULE_PREFIX,
 972        IPV6_SADDR_RULE_MAX
 973};
 974
 975struct ipv6_saddr_score {
 976        int                     rule;
 977        int                     addr_type;
 978        struct inet6_ifaddr     *ifa;
 979        DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 980        int                     scopedist;
 981        int                     matchlen;
 982};
 983
 984struct ipv6_saddr_dst {
 985        const struct in6_addr *addr;
 986        int ifindex;
 987        int scope;
 988        int label;
 989        unsigned int prefs;
 990};
 991
 992static inline int ipv6_saddr_preferred(int type)
 993{
 994        if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 995                    IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 996                return 1;
 997        return 0;
 998}
 999
1000static int ipv6_get_saddr_eval(struct net *net,
1001                               struct ipv6_saddr_score *score,
1002                               struct ipv6_saddr_dst *dst,
1003                               int i)
1004{
1005        int ret;
1006
1007        if (i <= score->rule) {
1008                switch (i) {
1009                case IPV6_SADDR_RULE_SCOPE:
1010                        ret = score->scopedist;
1011                        break;
1012                case IPV6_SADDR_RULE_PREFIX:
1013                        ret = score->matchlen;
1014                        break;
1015                default:
1016                        ret = !!test_bit(i, score->scorebits);
1017                }
1018                goto out;
1019        }
1020
1021        switch (i) {
1022        case IPV6_SADDR_RULE_INIT:
1023                /* Rule 0: remember if hiscore is not ready yet */
1024                ret = !!score->ifa;
1025                break;
1026        case IPV6_SADDR_RULE_LOCAL:
1027                /* Rule 1: Prefer same address */
1028                ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1029                break;
1030        case IPV6_SADDR_RULE_SCOPE:
1031                /* Rule 2: Prefer appropriate scope
1032                 *
1033                 *      ret
1034                 *       ^
1035                 *    -1 |  d 15
1036                 *    ---+--+-+---> scope
1037                 *       |
1038                 *       |             d is scope of the destination.
1039                 *  B-d  |  \
1040                 *       |   \      <- smaller scope is better if
1041                 *  B-15 |    \        if scope is enough for destinaion.
1042                 *       |             ret = B - scope (-1 <= scope >= d <= 15).
1043                 * d-C-1 | /
1044                 *       |/         <- greater is better
1045                 *   -C  /             if scope is not enough for destination.
1046                 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1047                 *
1048                 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049                 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050                 * Assume B = 0 and we get C > 29.
1051                 */
1052                ret = __ipv6_addr_src_scope(score->addr_type);
1053                if (ret >= dst->scope)
1054                        ret = -ret;
1055                else
1056                        ret -= 128;     /* 30 is enough */
1057                score->scopedist = ret;
1058                break;
1059        case IPV6_SADDR_RULE_PREFERRED:
1060                /* Rule 3: Avoid deprecated and optimistic addresses */
1061                ret = ipv6_saddr_preferred(score->addr_type) ||
1062                      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1063                break;
1064#ifdef CONFIG_IPV6_MIP6
1065        case IPV6_SADDR_RULE_HOA:
1066            {
1067                /* Rule 4: Prefer home address */
1068                int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069                ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1070                break;
1071            }
1072#endif
1073        case IPV6_SADDR_RULE_OIF:
1074                /* Rule 5: Prefer outgoing interface */
1075                ret = (!dst->ifindex ||
1076                       dst->ifindex == score->ifa->idev->dev->ifindex);
1077                break;
1078        case IPV6_SADDR_RULE_LABEL:
1079                /* Rule 6: Prefer matching label */
1080                ret = ipv6_addr_label(net,
1081                                      &score->ifa->addr, score->addr_type,
1082                                      score->ifa->idev->dev->ifindex) == dst->label;
1083                break;
1084#ifdef CONFIG_IPV6_PRIVACY
1085        case IPV6_SADDR_RULE_PRIVACY:
1086            {
1087                /* Rule 7: Prefer public address
1088                 * Note: prefer temprary address if use_tempaddr >= 2
1089                 */
1090                int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091                                !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092                                score->ifa->idev->cnf.use_tempaddr >= 2;
1093                ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1094                break;
1095            }
1096#endif
1097        case IPV6_SADDR_RULE_ORCHID:
1098                /* Rule 8-: Prefer ORCHID vs ORCHID or
1099                 *          non-ORCHID vs non-ORCHID
1100                 */
1101                ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102                        ipv6_addr_orchid(dst->addr));
1103                break;
1104        case IPV6_SADDR_RULE_PREFIX:
1105                /* Rule 8: Use longest matching prefix */
1106                score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107                                                       dst->addr);
1108                break;
1109        default:
1110                ret = 0;
1111        }
1112
1113        if (ret)
1114                __set_bit(i, score->scorebits);
1115        score->rule = i;
1116out:
1117        return ret;
1118}
1119
1120int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1121                       const struct in6_addr *daddr, unsigned int prefs,
1122                       struct in6_addr *saddr)
1123{
1124        struct ipv6_saddr_score scores[2],
1125                                *score = &scores[0], *hiscore = &scores[1];
1126        struct ipv6_saddr_dst dst;
1127        struct net_device *dev;
1128        int dst_type;
1129
1130        dst_type = __ipv6_addr_type(daddr);
1131        dst.addr = daddr;
1132        dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133        dst.scope = __ipv6_addr_src_scope(dst_type);
1134        dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1135        dst.prefs = prefs;
1136
1137        hiscore->rule = -1;
1138        hiscore->ifa = NULL;
1139
1140        read_lock(&dev_base_lock);
1141        rcu_read_lock();
1142
1143        for_each_netdev(net, dev) {
1144                struct inet6_dev *idev;
1145
1146                /* Candidate Source Address (section 4)
1147                 *  - multicast and link-local destination address,
1148                 *    the set of candidate source address MUST only
1149                 *    include addresses assigned to interfaces
1150                 *    belonging to the same link as the outgoing
1151                 *    interface.
1152                 * (- For site-local destination addresses, the
1153                 *    set of candidate source addresses MUST only
1154                 *    include addresses assigned to interfaces
1155                 *    belonging to the same site as the outgoing
1156                 *    interface.)
1157                 */
1158                if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160                    dst.ifindex && dev->ifindex != dst.ifindex)
1161                        continue;
1162
1163                idev = __in6_dev_get(dev);
1164                if (!idev)
1165                        continue;
1166
1167                read_lock_bh(&idev->lock);
1168                for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1169                        int i;
1170
1171                        /*
1172                         * - Tentative Address (RFC2462 section 5.4)
1173                         *  - A tentative address is not considered
1174                         *    "assigned to an interface" in the traditional
1175                         *    sense, unless it is also flagged as optimistic.
1176                         * - Candidate Source Address (section 4)
1177                         *  - In any case, anycast addresses, multicast
1178                         *    addresses, and the unspecified address MUST
1179                         *    NOT be included in a candidate set.
1180                         */
1181                        if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182                            (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1183                                continue;
1184
1185                        score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186
1187                        if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188                                     score->addr_type & IPV6_ADDR_MULTICAST)) {
1189                                LIMIT_NETDEBUG(KERN_DEBUG
1190                                               "ADDRCONF: unspecified / multicast address "
1191                                               "assigned as unicast address on %s",
1192                                               dev->name);
1193                                continue;
1194                        }
1195
1196                        score->rule = -1;
1197                        bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198
1199                        for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200                                int minihiscore, miniscore;
1201
1202                                minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203                                miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1204
1205                                if (minihiscore > miniscore) {
1206                                        if (i == IPV6_SADDR_RULE_SCOPE &&
1207                                            score->scopedist > 0) {
1208                                                /*
1209                                                 * special case:
1210                                                 * each remaining entry
1211                                                 * has too small (not enough)
1212                                                 * scope, because ifa entries
1213                                                 * are sorted by their scope
1214                                                 * values.
1215                                                 */
1216                                                goto try_nextdev;
1217                                        }
1218                                        break;
1219                                } else if (minihiscore < miniscore) {
1220                                        if (hiscore->ifa)
1221                                                in6_ifa_put(hiscore->ifa);
1222
1223                                        in6_ifa_hold(score->ifa);
1224
1225                                        swap(hiscore, score);
1226
1227                                        /* restore our iterator */
1228                                        score->ifa = hiscore->ifa;
1229
1230                                        break;
1231                                }
1232                        }
1233                }
1234try_nextdev:
1235                read_unlock_bh(&idev->lock);
1236        }
1237        rcu_read_unlock();
1238        read_unlock(&dev_base_lock);
1239
1240        if (!hiscore->ifa)
1241                return -EADDRNOTAVAIL;
1242
1243        ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1244        in6_ifa_put(hiscore->ifa);
1245        return 0;
1246}
1247
1248EXPORT_SYMBOL(ipv6_dev_get_saddr);
1249
1250int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1251                    unsigned char banned_flags)
1252{
1253        struct inet6_dev *idev;
1254        int err = -EADDRNOTAVAIL;
1255
1256        rcu_read_lock();
1257        if ((idev = __in6_dev_get(dev)) != NULL) {
1258                struct inet6_ifaddr *ifp;
1259
1260                read_lock_bh(&idev->lock);
1261                for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1262                        if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1263                                ipv6_addr_copy(addr, &ifp->addr);
1264                                err = 0;
1265                                break;
1266                        }
1267                }
1268                read_unlock_bh(&idev->lock);
1269        }
1270        rcu_read_unlock();
1271        return err;
1272}
1273
1274static int ipv6_count_addresses(struct inet6_dev *idev)
1275{
1276        int cnt = 0;
1277        struct inet6_ifaddr *ifp;
1278
1279        read_lock_bh(&idev->lock);
1280        for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1281                cnt++;
1282        read_unlock_bh(&idev->lock);
1283        return cnt;
1284}
1285
1286int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1287                  struct net_device *dev, int strict)
1288{
1289        struct inet6_ifaddr * ifp;
1290        u8 hash = ipv6_addr_hash(addr);
1291
1292        read_lock_bh(&addrconf_hash_lock);
1293        for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1294                if (!net_eq(dev_net(ifp->idev->dev), net))
1295                        continue;
1296                if (ipv6_addr_equal(&ifp->addr, addr) &&
1297                    !(ifp->flags&IFA_F_TENTATIVE)) {
1298                        if (dev == NULL || ifp->idev->dev == dev ||
1299                            !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1300                                break;
1301                }
1302        }
1303        read_unlock_bh(&addrconf_hash_lock);
1304        return ifp != NULL;
1305}
1306EXPORT_SYMBOL(ipv6_chk_addr);
1307
1308static
1309int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1310                       struct net_device *dev)
1311{
1312        struct inet6_ifaddr * ifp;
1313        u8 hash = ipv6_addr_hash(addr);
1314
1315        for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1316                if (!net_eq(dev_net(ifp->idev->dev), net))
1317                        continue;
1318                if (ipv6_addr_equal(&ifp->addr, addr)) {
1319                        if (dev == NULL || ifp->idev->dev == dev)
1320                                break;
1321                }
1322        }
1323        return ifp != NULL;
1324}
1325
1326int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1327{
1328        struct inet6_dev *idev;
1329        struct inet6_ifaddr *ifa;
1330        int     onlink;
1331
1332        onlink = 0;
1333        rcu_read_lock();
1334        idev = __in6_dev_get(dev);
1335        if (idev) {
1336                read_lock_bh(&idev->lock);
1337                for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1338                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
1339                                                   ifa->prefix_len);
1340                        if (onlink)
1341                                break;
1342                }
1343                read_unlock_bh(&idev->lock);
1344        }
1345        rcu_read_unlock();
1346        return onlink;
1347}
1348
1349EXPORT_SYMBOL(ipv6_chk_prefix);
1350
1351struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1352                                     struct net_device *dev, int strict)
1353{
1354        struct inet6_ifaddr * ifp;
1355        u8 hash = ipv6_addr_hash(addr);
1356
1357        read_lock_bh(&addrconf_hash_lock);
1358        for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1359                if (!net_eq(dev_net(ifp->idev->dev), net))
1360                        continue;
1361                if (ipv6_addr_equal(&ifp->addr, addr)) {
1362                        if (dev == NULL || ifp->idev->dev == dev ||
1363                            !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1364                                in6_ifa_hold(ifp);
1365                                break;
1366                        }
1367                }
1368        }
1369        read_unlock_bh(&addrconf_hash_lock);
1370
1371        return ifp;
1372}
1373
1374/* Gets referenced address, destroys ifaddr */
1375
1376static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1377{
1378        if (ifp->flags&IFA_F_PERMANENT) {
1379                spin_lock_bh(&ifp->lock);
1380                addrconf_del_timer(ifp);
1381                ifp->flags |= IFA_F_TENTATIVE;
1382                if (dad_failed)
1383                        ifp->flags |= IFA_F_DADFAILED;
1384                spin_unlock_bh(&ifp->lock);
1385                in6_ifa_put(ifp);
1386#ifdef CONFIG_IPV6_PRIVACY
1387        } else if (ifp->flags&IFA_F_TEMPORARY) {
1388                struct inet6_ifaddr *ifpub;
1389                spin_lock_bh(&ifp->lock);
1390                ifpub = ifp->ifpub;
1391                if (ifpub) {
1392                        in6_ifa_hold(ifpub);
1393                        spin_unlock_bh(&ifp->lock);
1394                        ipv6_create_tempaddr(ifpub, ifp);
1395                        in6_ifa_put(ifpub);
1396                } else {
1397                        spin_unlock_bh(&ifp->lock);
1398                }
1399                ipv6_del_addr(ifp);
1400#endif
1401        } else
1402                ipv6_del_addr(ifp);
1403}
1404
1405void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1406{
1407        struct inet6_dev *idev = ifp->idev;
1408
1409        if (net_ratelimit())
1410                printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1411                        ifp->idev->dev->name, &ifp->addr);
1412
1413        if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1414                struct in6_addr addr;
1415
1416                addr.s6_addr32[0] = htonl(0xfe800000);
1417                addr.s6_addr32[1] = 0;
1418
1419                if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1420                    ipv6_addr_equal(&ifp->addr, &addr)) {
1421                        /* DAD failed for link-local based on MAC address */
1422                        idev->cnf.disable_ipv6 = 1;
1423
1424                        printk(KERN_INFO "%s: IPv6 being disabled!\n",
1425                                ifp->idev->dev->name);
1426                }
1427        }
1428
1429        addrconf_dad_stop(ifp, 1);
1430}
1431
1432/* Join to solicited addr multicast group. */
1433
1434void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1435{
1436        struct in6_addr maddr;
1437
1438        if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1439                return;
1440
1441        addrconf_addr_solict_mult(addr, &maddr);
1442        ipv6_dev_mc_inc(dev, &maddr);
1443}
1444
1445void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1446{
1447        struct in6_addr maddr;
1448
1449        if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1450                return;
1451
1452        addrconf_addr_solict_mult(addr, &maddr);
1453        __ipv6_dev_mc_dec(idev, &maddr);
1454}
1455
1456static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1457{
1458        struct in6_addr addr;
1459        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1460        if (ipv6_addr_any(&addr))
1461                return;
1462        ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1463}
1464
1465static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1466{
1467        struct in6_addr addr;
1468        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1469        if (ipv6_addr_any(&addr))
1470                return;
1471        __ipv6_dev_ac_dec(ifp->idev, &addr);
1472}
1473
1474static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1475{
1476        if (dev->addr_len != ETH_ALEN)
1477                return -1;
1478        memcpy(eui, dev->dev_addr, 3);
1479        memcpy(eui + 5, dev->dev_addr + 3, 3);
1480
1481        /*
1482         * The zSeries OSA network cards can be shared among various
1483         * OS instances, but the OSA cards have only one MAC address.
1484         * This leads to duplicate address conflicts in conjunction
1485         * with IPv6 if more than one instance uses the same card.
1486         *
1487         * The driver for these cards can deliver a unique 16-bit
1488         * identifier for each instance sharing the same card.  It is
1489         * placed instead of 0xFFFE in the interface identifier.  The
1490         * "u" bit of the interface identifier is not inverted in this
1491         * case.  Hence the resulting interface identifier has local
1492         * scope according to RFC2373.
1493         */
1494        if (dev->dev_id) {
1495                eui[3] = (dev->dev_id >> 8) & 0xFF;
1496                eui[4] = dev->dev_id & 0xFF;
1497        } else {
1498                eui[3] = 0xFF;
1499                eui[4] = 0xFE;
1500                eui[0] ^= 2;
1501        }
1502        return 0;
1503}
1504
1505static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1506{
1507        /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1508        if (dev->addr_len != ARCNET_ALEN)
1509                return -1;
1510        memset(eui, 0, 7);
1511        eui[7] = *(u8*)dev->dev_addr;
1512        return 0;
1513}
1514
1515static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1516{
1517        if (dev->addr_len != INFINIBAND_ALEN)
1518                return -1;
1519        memcpy(eui, dev->dev_addr + 12, 8);
1520        eui[0] |= 2;
1521        return 0;
1522}
1523
1524int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1525{
1526        if (addr == 0)
1527                return -1;
1528        eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1529                  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1530                  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1531                  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1532                  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1533                  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1534        eui[1] = 0;
1535        eui[2] = 0x5E;
1536        eui[3] = 0xFE;
1537        memcpy(eui + 4, &addr, 4);
1538        return 0;
1539}
1540EXPORT_SYMBOL(__ipv6_isatap_ifid);
1541
1542static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1543{
1544        if (dev->priv_flags & IFF_ISATAP)
1545                return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1546        return -1;
1547}
1548
1549static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1550{
1551        switch (dev->type) {
1552        case ARPHRD_ETHER:
1553        case ARPHRD_FDDI:
1554        case ARPHRD_IEEE802_TR:
1555                return addrconf_ifid_eui48(eui, dev);
1556        case ARPHRD_ARCNET:
1557                return addrconf_ifid_arcnet(eui, dev);
1558        case ARPHRD_INFINIBAND:
1559                return addrconf_ifid_infiniband(eui, dev);
1560        case ARPHRD_SIT:
1561                return addrconf_ifid_sit(eui, dev);
1562        }
1563        return -1;
1564}
1565
1566static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1567{
1568        int err = -1;
1569        struct inet6_ifaddr *ifp;
1570
1571        read_lock_bh(&idev->lock);
1572        for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1573                if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1574                        memcpy(eui, ifp->addr.s6_addr+8, 8);
1575                        err = 0;
1576                        break;
1577                }
1578        }
1579        read_unlock_bh(&idev->lock);
1580        return err;
1581}
1582
1583#ifdef CONFIG_IPV6_PRIVACY
1584/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1585static int __ipv6_regen_rndid(struct inet6_dev *idev)
1586{
1587regen:
1588        get_random_bytes(idev->rndid, sizeof(idev->rndid));
1589        idev->rndid[0] &= ~0x02;
1590
1591        /*
1592         * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1593         * check if generated address is not inappropriate
1594         *
1595         *  - Reserved subnet anycast (RFC 2526)
1596         *      11111101 11....11 1xxxxxxx
1597         *  - ISATAP (RFC4214) 6.1
1598         *      00-00-5E-FE-xx-xx-xx-xx
1599         *  - value 0
1600         *  - XXX: already assigned to an address on the device
1601         */
1602        if (idev->rndid[0] == 0xfd &&
1603            (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1604            (idev->rndid[7]&0x80))
1605                goto regen;
1606        if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1607                if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1608                        goto regen;
1609                if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1610                        goto regen;
1611        }
1612
1613        return 0;
1614}
1615
1616static void ipv6_regen_rndid(unsigned long data)
1617{
1618        struct inet6_dev *idev = (struct inet6_dev *) data;
1619        unsigned long expires;
1620
1621        rcu_read_lock_bh();
1622        write_lock_bh(&idev->lock);
1623
1624        if (idev->dead)
1625                goto out;
1626
1627        if (__ipv6_regen_rndid(idev) < 0)
1628                goto out;
1629
1630        expires = jiffies +
1631                idev->cnf.temp_prefered_lft * HZ -
1632                idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1633        if (time_before(expires, jiffies)) {
1634                printk(KERN_WARNING
1635                        "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1636                        idev->dev->name);
1637                goto out;
1638        }
1639
1640        if (!mod_timer(&idev->regen_timer, expires))
1641                in6_dev_hold(idev);
1642
1643out:
1644        write_unlock_bh(&idev->lock);
1645        rcu_read_unlock_bh();
1646        in6_dev_put(idev);
1647}
1648
1649static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1650        int ret = 0;
1651
1652        if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1653                ret = __ipv6_regen_rndid(idev);
1654        return ret;
1655}
1656#endif
1657
1658/*
1659 *      Add prefix route.
1660 */
1661
1662static void
1663addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1664                      unsigned long expires, u32 flags)
1665{
1666        struct fib6_config cfg = {
1667                .fc_table = RT6_TABLE_PREFIX,
1668                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1669                .fc_ifindex = dev->ifindex,
1670                .fc_expires = expires,
1671                .fc_dst_len = plen,
1672                .fc_flags = RTF_UP | flags,
1673                .fc_nlinfo.nl_net = dev_net(dev),
1674                .fc_protocol = RTPROT_KERNEL,
1675        };
1676
1677        ipv6_addr_copy(&cfg.fc_dst, pfx);
1678
1679        /* Prevent useless cloning on PtP SIT.
1680           This thing is done here expecting that the whole
1681           class of non-broadcast devices need not cloning.
1682         */
1683#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1684        if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1685                cfg.fc_flags |= RTF_NONEXTHOP;
1686#endif
1687
1688        ip6_route_add(&cfg);
1689}
1690
1691/* Create "default" multicast route to the interface */
1692
1693static void addrconf_add_mroute(struct net_device *dev)
1694{
1695        struct fib6_config cfg = {
1696                .fc_table = RT6_TABLE_LOCAL,
1697                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1698                .fc_ifindex = dev->ifindex,
1699                .fc_dst_len = 8,
1700                .fc_flags = RTF_UP,
1701                .fc_nlinfo.nl_net = dev_net(dev),
1702        };
1703
1704        ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1705
1706        ip6_route_add(&cfg);
1707}
1708
1709#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1710static void sit_route_add(struct net_device *dev)
1711{
1712        struct fib6_config cfg = {
1713                .fc_table = RT6_TABLE_MAIN,
1714                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1715                .fc_ifindex = dev->ifindex,
1716                .fc_dst_len = 96,
1717                .fc_flags = RTF_UP | RTF_NONEXTHOP,
1718                .fc_nlinfo.nl_net = dev_net(dev),
1719        };
1720
1721        /* prefix length - 96 bits "::d.d.d.d" */
1722        ip6_route_add(&cfg);
1723}
1724#endif
1725
1726static void addrconf_add_lroute(struct net_device *dev)
1727{
1728        struct in6_addr addr;
1729
1730        ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1731        addrconf_prefix_route(&addr, 64, dev, 0, 0);
1732}
1733
1734static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1735{
1736        struct inet6_dev *idev;
1737
1738        ASSERT_RTNL();
1739
1740        if ((idev = ipv6_find_idev(dev)) == NULL)
1741                return NULL;
1742
1743        /* Add default multicast route */
1744        addrconf_add_mroute(dev);
1745
1746        /* Add link local route */
1747        addrconf_add_lroute(dev);
1748        return idev;
1749}
1750
1751void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1752{
1753        struct prefix_info *pinfo;
1754        __u32 valid_lft;
1755        __u32 prefered_lft;
1756        int addr_type;
1757        struct inet6_dev *in6_dev;
1758        struct net *net = dev_net(dev);
1759
1760        pinfo = (struct prefix_info *) opt;
1761
1762        if (len < sizeof(struct prefix_info)) {
1763                ADBG(("addrconf: prefix option too short\n"));
1764                return;
1765        }
1766
1767        /*
1768         *      Validation checks ([ADDRCONF], page 19)
1769         */
1770
1771        addr_type = ipv6_addr_type(&pinfo->prefix);
1772
1773        if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1774                return;
1775
1776        valid_lft = ntohl(pinfo->valid);
1777        prefered_lft = ntohl(pinfo->prefered);
1778
1779        if (prefered_lft > valid_lft) {
1780                if (net_ratelimit())
1781                        printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1782                return;
1783        }
1784
1785        in6_dev = in6_dev_get(dev);
1786
1787        if (in6_dev == NULL) {
1788                if (net_ratelimit())
1789                        printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1790                return;
1791        }
1792
1793        /*
1794         *      Two things going on here:
1795         *      1) Add routes for on-link prefixes
1796         *      2) Configure prefixes with the auto flag set
1797         */
1798
1799        if (pinfo->onlink) {
1800                struct rt6_info *rt;
1801                unsigned long rt_expires;
1802
1803                /* Avoid arithmetic overflow. Really, we could
1804                 * save rt_expires in seconds, likely valid_lft,
1805                 * but it would require division in fib gc, that it
1806                 * not good.
1807                 */
1808                if (HZ > USER_HZ)
1809                        rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1810                else
1811                        rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1812
1813                if (addrconf_finite_timeout(rt_expires))
1814                        rt_expires *= HZ;
1815
1816                rt = rt6_lookup(net, &pinfo->prefix, NULL,
1817                                dev->ifindex, 1);
1818
1819                if (rt && addrconf_is_prefix_route(rt)) {
1820                        /* Autoconf prefix route */
1821                        if (valid_lft == 0) {
1822                                ip6_del_rt(rt);
1823                                rt = NULL;
1824                        } else if (addrconf_finite_timeout(rt_expires)) {
1825                                /* not infinity */
1826                                rt->rt6i_expires = jiffies + rt_expires;
1827                                rt->rt6i_flags |= RTF_EXPIRES;
1828                        } else {
1829                                rt->rt6i_flags &= ~RTF_EXPIRES;
1830                                rt->rt6i_expires = 0;
1831                        }
1832                } else if (valid_lft) {
1833                        clock_t expires = 0;
1834                        int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1835                        if (addrconf_finite_timeout(rt_expires)) {
1836                                /* not infinity */
1837                                flags |= RTF_EXPIRES;
1838                                expires = jiffies_to_clock_t(rt_expires);
1839                        }
1840                        addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1841                                              dev, expires, flags);
1842                }
1843                if (rt)
1844                        dst_release(&rt->u.dst);
1845        }
1846
1847        /* Try to figure out our local address for this prefix */
1848
1849        if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1850                struct inet6_ifaddr * ifp;
1851                struct in6_addr addr;
1852                int create = 0, update_lft = 0;
1853
1854                if (pinfo->prefix_len == 64) {
1855                        memcpy(&addr, &pinfo->prefix, 8);
1856                        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1857                            ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1858                                in6_dev_put(in6_dev);
1859                                return;
1860                        }
1861                        goto ok;
1862                }
1863                if (net_ratelimit())
1864                        printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1865                               pinfo->prefix_len);
1866                in6_dev_put(in6_dev);
1867                return;
1868
1869ok:
1870
1871                ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1872
1873                if (ifp == NULL && valid_lft) {
1874                        int max_addresses = in6_dev->cnf.max_addresses;
1875                        u32 addr_flags = 0;
1876
1877#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1878                        if (in6_dev->cnf.optimistic_dad &&
1879                            !net->ipv6.devconf_all->forwarding)
1880                                addr_flags = IFA_F_OPTIMISTIC;
1881#endif
1882
1883                        /* Do not allow to create too much of autoconfigured
1884                         * addresses; this would be too easy way to crash kernel.
1885                         */
1886                        if (!max_addresses ||
1887                            ipv6_count_addresses(in6_dev) < max_addresses)
1888                                ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1889                                                    addr_type&IPV6_ADDR_SCOPE_MASK,
1890                                                    addr_flags);
1891
1892                        if (!ifp || IS_ERR(ifp)) {
1893                                in6_dev_put(in6_dev);
1894                                return;
1895                        }
1896
1897                        update_lft = create = 1;
1898                        ifp->cstamp = jiffies;
1899                        addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1900                }
1901
1902                if (ifp) {
1903                        int flags;
1904                        unsigned long now;
1905#ifdef CONFIG_IPV6_PRIVACY
1906                        struct inet6_ifaddr *ift;
1907#endif
1908                        u32 stored_lft;
1909
1910                        /* update lifetime (RFC2462 5.5.3 e) */
1911                        spin_lock(&ifp->lock);
1912                        now = jiffies;
1913                        if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1914                                stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1915                        else
1916                                stored_lft = 0;
1917                        if (!update_lft && stored_lft) {
1918                                if (valid_lft > MIN_VALID_LIFETIME ||
1919                                    valid_lft > stored_lft)
1920                                        update_lft = 1;
1921                                else if (stored_lft <= MIN_VALID_LIFETIME) {
1922                                        /* valid_lft <= stored_lft is always true */
1923                                        /*
1924                                         * RFC 4862 Section 5.5.3e:
1925                                         * "Note that the preferred lifetime of
1926                                         *  the corresponding address is always
1927                                         *  reset to the Preferred Lifetime in
1928                                         *  the received Prefix Information
1929                                         *  option, regardless of whether the
1930                                         *  valid lifetime is also reset or
1931                                         *  ignored."
1932                                         *
1933                                         *  So if the preferred lifetime in
1934                                         *  this advertisement is different
1935                                         *  than what we have stored, but the
1936                                         *  valid lifetime is invalid, just
1937                                         *  reset prefered_lft.
1938                                         *
1939                                         *  We must set the valid lifetime
1940                                         *  to the stored lifetime since we'll
1941                                         *  be updating the timestamp below,
1942                                         *  else we'll set it back to the
1943                                         *  minumum.
1944                                         */
1945                                        if (prefered_lft != ifp->prefered_lft) {
1946                                                valid_lft = stored_lft;
1947                                                update_lft = 1;
1948                                        }
1949                                } else {
1950                                        valid_lft = MIN_VALID_LIFETIME;
1951                                        if (valid_lft < prefered_lft)
1952                                                prefered_lft = valid_lft;
1953                                        update_lft = 1;
1954                                }
1955                        }
1956
1957                        if (update_lft) {
1958                                ifp->valid_lft = valid_lft;
1959                                ifp->prefered_lft = prefered_lft;
1960                                ifp->tstamp = now;
1961                                flags = ifp->flags;
1962                                ifp->flags &= ~IFA_F_DEPRECATED;
1963                                spin_unlock(&ifp->lock);
1964
1965                                if (!(flags&IFA_F_TENTATIVE))
1966                                        ipv6_ifa_notify(0, ifp);
1967                        } else
1968                                spin_unlock(&ifp->lock);
1969
1970#ifdef CONFIG_IPV6_PRIVACY
1971                        read_lock_bh(&in6_dev->lock);
1972                        /* update all temporary addresses in the list */
1973                        for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1974                                /*
1975                                 * When adjusting the lifetimes of an existing
1976                                 * temporary address, only lower the lifetimes.
1977                                 * Implementations must not increase the
1978                                 * lifetimes of an existing temporary address
1979                                 * when processing a Prefix Information Option.
1980                                 */
1981                                if (ifp != ift->ifpub)
1982                                        continue;
1983
1984                                spin_lock(&ift->lock);
1985                                flags = ift->flags;
1986                                if (ift->valid_lft > valid_lft &&
1987                                    ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1988                                        ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1989                                if (ift->prefered_lft > prefered_lft &&
1990                                    ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1991                                        ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1992                                spin_unlock(&ift->lock);
1993                                if (!(flags&IFA_F_TENTATIVE))
1994                                        ipv6_ifa_notify(0, ift);
1995                        }
1996
1997                        if (create && in6_dev->cnf.use_tempaddr > 0) {
1998                                /*
1999                                 * When a new public address is created as described in [ADDRCONF],
2000                                 * also create a new temporary address.
2001                                 */
2002                                read_unlock_bh(&in6_dev->lock);
2003                                ipv6_create_tempaddr(ifp, NULL);
2004                        } else {
2005                                read_unlock_bh(&in6_dev->lock);
2006                        }
2007#endif
2008                        in6_ifa_put(ifp);
2009                        addrconf_verify(0);
2010                }
2011        }
2012        inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2013        in6_dev_put(in6_dev);
2014}
2015
2016/*
2017 *      Set destination address.
2018 *      Special case for SIT interfaces where we create a new "virtual"
2019 *      device.
2020 */
2021int addrconf_set_dstaddr(struct net *net, void __user *arg)
2022{
2023        struct in6_ifreq ireq;
2024        struct net_device *dev;
2025        int err = -EINVAL;
2026
2027        rtnl_lock();
2028
2029        err = -EFAULT;
2030        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2031                goto err_exit;
2032
2033        dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2034
2035        err = -ENODEV;
2036        if (dev == NULL)
2037                goto err_exit;
2038
2039#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2040        if (dev->type == ARPHRD_SIT) {
2041                const struct net_device_ops *ops = dev->netdev_ops;
2042                struct ifreq ifr;
2043                struct ip_tunnel_parm p;
2044
2045                err = -EADDRNOTAVAIL;
2046                if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2047                        goto err_exit;
2048
2049                memset(&p, 0, sizeof(p));
2050                p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2051                p.iph.saddr = 0;
2052                p.iph.version = 4;
2053                p.iph.ihl = 5;
2054                p.iph.protocol = IPPROTO_IPV6;
2055                p.iph.ttl = 64;
2056                ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2057
2058                if (ops->ndo_do_ioctl) {
2059                        mm_segment_t oldfs = get_fs();
2060
2061                        set_fs(KERNEL_DS);
2062                        err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2063                        set_fs(oldfs);
2064                } else
2065                        err = -EOPNOTSUPP;
2066
2067                if (err == 0) {
2068                        err = -ENOBUFS;
2069                        dev = __dev_get_by_name(net, p.name);
2070                        if (!dev)
2071                                goto err_exit;
2072                        err = dev_open(dev);
2073                }
2074        }
2075#endif
2076
2077err_exit:
2078        rtnl_unlock();
2079        return err;
2080}
2081
2082/*
2083 *      Manual configuration of address on an interface
2084 */
2085static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2086                          unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2087                          __u32 valid_lft)
2088{
2089        struct inet6_ifaddr *ifp;
2090        struct inet6_dev *idev;
2091        struct net_device *dev;
2092        int scope;
2093        u32 flags;
2094        clock_t expires;
2095        unsigned long timeout;
2096
2097        ASSERT_RTNL();
2098
2099        if (plen > 128)
2100                return -EINVAL;
2101
2102        /* check the lifetime */
2103        if (!valid_lft || prefered_lft > valid_lft)
2104                return -EINVAL;
2105
2106        dev = __dev_get_by_index(net, ifindex);
2107        if (!dev)
2108                return -ENODEV;
2109
2110        if ((idev = addrconf_add_dev(dev)) == NULL)
2111                return -ENOBUFS;
2112
2113        scope = ipv6_addr_scope(pfx);
2114
2115        timeout = addrconf_timeout_fixup(valid_lft, HZ);
2116        if (addrconf_finite_timeout(timeout)) {
2117                expires = jiffies_to_clock_t(timeout * HZ);
2118                valid_lft = timeout;
2119                flags = RTF_EXPIRES;
2120        } else {
2121                expires = 0;
2122                flags = 0;
2123                ifa_flags |= IFA_F_PERMANENT;
2124        }
2125
2126        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2127        if (addrconf_finite_timeout(timeout)) {
2128                if (timeout == 0)
2129                        ifa_flags |= IFA_F_DEPRECATED;
2130                prefered_lft = timeout;
2131        }
2132
2133        ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2134
2135        if (!IS_ERR(ifp)) {
2136                spin_lock_bh(&ifp->lock);
2137                ifp->valid_lft = valid_lft;
2138                ifp->prefered_lft = prefered_lft;
2139                ifp->tstamp = jiffies;
2140                spin_unlock_bh(&ifp->lock);
2141
2142                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2143                                      expires, flags);
2144                /*
2145                 * Note that section 3.1 of RFC 4429 indicates
2146                 * that the Optimistic flag should not be set for
2147                 * manually configured addresses
2148                 */
2149                addrconf_dad_start(ifp, 0);
2150                in6_ifa_put(ifp);
2151                addrconf_verify(0);
2152                return 0;
2153        }
2154
2155        return PTR_ERR(ifp);
2156}
2157
2158static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2159                          unsigned int plen)
2160{
2161        struct inet6_ifaddr *ifp;
2162        struct inet6_dev *idev;
2163        struct net_device *dev;
2164
2165        if (plen > 128)
2166                return -EINVAL;
2167
2168        dev = __dev_get_by_index(net, ifindex);
2169        if (!dev)
2170                return -ENODEV;
2171
2172        if ((idev = __in6_dev_get(dev)) == NULL)
2173                return -ENXIO;
2174
2175        read_lock_bh(&idev->lock);
2176        for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2177                if (ifp->prefix_len == plen &&
2178                    ipv6_addr_equal(pfx, &ifp->addr)) {
2179                        in6_ifa_hold(ifp);
2180                        read_unlock_bh(&idev->lock);
2181
2182                        ipv6_del_addr(ifp);
2183
2184                        /* If the last address is deleted administratively,
2185                           disable IPv6 on this interface.
2186                         */
2187                        if (idev->addr_list == NULL)
2188                                addrconf_ifdown(idev->dev, 1);
2189                        return 0;
2190                }
2191        }
2192        read_unlock_bh(&idev->lock);
2193        return -EADDRNOTAVAIL;
2194}
2195
2196
2197int addrconf_add_ifaddr(struct net *net, void __user *arg)
2198{
2199        struct in6_ifreq ireq;
2200        int err;
2201
2202        if (!capable(CAP_NET_ADMIN))
2203                return -EPERM;
2204
2205        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2206                return -EFAULT;
2207
2208        rtnl_lock();
2209        err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2210                             ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2211                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2212        rtnl_unlock();
2213        return err;
2214}
2215
2216int addrconf_del_ifaddr(struct net *net, void __user *arg)
2217{
2218        struct in6_ifreq ireq;
2219        int err;
2220
2221        if (!capable(CAP_NET_ADMIN))
2222                return -EPERM;
2223
2224        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2225                return -EFAULT;
2226
2227        rtnl_lock();
2228        err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2229                             ireq.ifr6_prefixlen);
2230        rtnl_unlock();
2231        return err;
2232}
2233
2234static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2235                     int plen, int scope)
2236{
2237        struct inet6_ifaddr *ifp;
2238
2239        ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2240        if (!IS_ERR(ifp)) {
2241                spin_lock_bh(&ifp->lock);
2242                ifp->flags &= ~IFA_F_TENTATIVE;
2243                spin_unlock_bh(&ifp->lock);
2244                ipv6_ifa_notify(RTM_NEWADDR, ifp);
2245                in6_ifa_put(ifp);
2246        }
2247}
2248
2249#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2250static void sit_add_v4_addrs(struct inet6_dev *idev)
2251{
2252        struct in6_addr addr;
2253        struct net_device *dev;
2254        struct net *net = dev_net(idev->dev);
2255        int scope;
2256
2257        ASSERT_RTNL();
2258
2259        memset(&addr, 0, sizeof(struct in6_addr));
2260        memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2261
2262        if (idev->dev->flags&IFF_POINTOPOINT) {
2263                addr.s6_addr32[0] = htonl(0xfe800000);
2264                scope = IFA_LINK;
2265        } else {
2266                scope = IPV6_ADDR_COMPATv4;
2267        }
2268
2269        if (addr.s6_addr32[3]) {
2270                add_addr(idev, &addr, 128, scope);
2271                return;
2272        }
2273
2274        for_each_netdev(net, dev) {
2275                struct in_device * in_dev = __in_dev_get_rtnl(dev);
2276                if (in_dev && (dev->flags & IFF_UP)) {
2277                        struct in_ifaddr * ifa;
2278
2279                        int flag = scope;
2280
2281                        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2282                                int plen;
2283
2284                                addr.s6_addr32[3] = ifa->ifa_local;
2285
2286                                if (ifa->ifa_scope == RT_SCOPE_LINK)
2287                                        continue;
2288                                if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2289                                        if (idev->dev->flags&IFF_POINTOPOINT)
2290                                                continue;
2291                                        flag |= IFA_HOST;
2292                                }
2293                                if (idev->dev->flags&IFF_POINTOPOINT)
2294                                        plen = 64;
2295                                else
2296                                        plen = 96;
2297
2298                                add_addr(idev, &addr, plen, flag);
2299                        }
2300                }
2301        }
2302}
2303#endif
2304
2305static void init_loopback(struct net_device *dev)
2306{
2307        struct inet6_dev  *idev;
2308
2309        /* ::1 */
2310
2311        ASSERT_RTNL();
2312
2313        if ((idev = ipv6_find_idev(dev)) == NULL) {
2314                printk(KERN_DEBUG "init loopback: add_dev failed\n");
2315                return;
2316        }
2317
2318        add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2319}
2320
2321static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2322{
2323        struct inet6_ifaddr * ifp;
2324        u32 addr_flags = IFA_F_PERMANENT;
2325
2326#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2327        if (idev->cnf.optimistic_dad &&
2328            !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2329                addr_flags |= IFA_F_OPTIMISTIC;
2330#endif
2331
2332
2333        ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2334        if (!IS_ERR(ifp)) {
2335                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2336                addrconf_dad_start(ifp, 0);
2337                in6_ifa_put(ifp);
2338        }
2339}
2340
2341static void addrconf_dev_config(struct net_device *dev)
2342{
2343        struct in6_addr addr;
2344        struct inet6_dev    * idev;
2345
2346        ASSERT_RTNL();
2347
2348        if ((dev->type != ARPHRD_ETHER) &&
2349            (dev->type != ARPHRD_FDDI) &&
2350            (dev->type != ARPHRD_IEEE802_TR) &&
2351            (dev->type != ARPHRD_ARCNET) &&
2352            (dev->type != ARPHRD_INFINIBAND)) {
2353                /* Alas, we support only Ethernet autoconfiguration. */
2354                return;
2355        }
2356
2357        idev = addrconf_add_dev(dev);
2358        if (idev == NULL)
2359                return;
2360
2361        memset(&addr, 0, sizeof(struct in6_addr));
2362        addr.s6_addr32[0] = htonl(0xFE800000);
2363
2364        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2365                addrconf_add_linklocal(idev, &addr);
2366}
2367
2368#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2369static void addrconf_sit_config(struct net_device *dev)
2370{
2371        struct inet6_dev *idev;
2372
2373        ASSERT_RTNL();
2374
2375        /*
2376         * Configure the tunnel with one of our IPv4
2377         * addresses... we should configure all of
2378         * our v4 addrs in the tunnel
2379         */
2380
2381        if ((idev = ipv6_find_idev(dev)) == NULL) {
2382                printk(KERN_DEBUG "init sit: add_dev failed\n");
2383                return;
2384        }
2385
2386        if (dev->priv_flags & IFF_ISATAP) {
2387                struct in6_addr addr;
2388
2389                ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2390                addrconf_prefix_route(&addr, 64, dev, 0, 0);
2391                if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2392                        addrconf_add_linklocal(idev, &addr);
2393                return;
2394        }
2395
2396        sit_add_v4_addrs(idev);
2397
2398        if (dev->flags&IFF_POINTOPOINT) {
2399                addrconf_add_mroute(dev);
2400                addrconf_add_lroute(dev);
2401        } else
2402                sit_route_add(dev);
2403}
2404#endif
2405
2406static inline int
2407ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2408{
2409        struct in6_addr lladdr;
2410
2411        if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2412                addrconf_add_linklocal(idev, &lladdr);
2413                return 0;
2414        }
2415        return -1;
2416}
2417
2418static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2419{
2420        struct net_device *link_dev;
2421        struct net *net = dev_net(idev->dev);
2422
2423        /* first try to inherit the link-local address from the link device */
2424        if (idev->dev->iflink &&
2425            (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2426                if (!ipv6_inherit_linklocal(idev, link_dev))
2427                        return;
2428        }
2429        /* then try to inherit it from any device */
2430        for_each_netdev(net, link_dev) {
2431                if (!ipv6_inherit_linklocal(idev, link_dev))
2432                        return;
2433        }
2434        printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2435}
2436
2437/*
2438 * Autoconfigure tunnel with a link-local address so routing protocols,
2439 * DHCPv6, MLD etc. can be run over the virtual link
2440 */
2441
2442static void addrconf_ip6_tnl_config(struct net_device *dev)
2443{
2444        struct inet6_dev *idev;
2445
2446        ASSERT_RTNL();
2447
2448        if ((idev = addrconf_add_dev(dev)) == NULL) {
2449                printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2450                return;
2451        }
2452        ip6_tnl_add_linklocal(idev);
2453}
2454
2455static int addrconf_notify(struct notifier_block *this, unsigned long event,
2456                           void * data)
2457{
2458        struct net_device *dev = (struct net_device *) data;
2459        struct inet6_dev *idev = __in6_dev_get(dev);
2460        int run_pending = 0;
2461        int err;
2462
2463        switch(event) {
2464        case NETDEV_REGISTER:
2465                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2466                        idev = ipv6_add_dev(dev);
2467                        if (!idev)
2468                                return notifier_from_errno(-ENOMEM);
2469                }
2470                break;
2471        case NETDEV_UP:
2472        case NETDEV_CHANGE:
2473                if (dev->flags & IFF_SLAVE)
2474                        break;
2475
2476                if (event == NETDEV_UP) {
2477                        if (!addrconf_qdisc_ok(dev)) {
2478                                /* device is not ready yet. */
2479                                printk(KERN_INFO
2480                                        "ADDRCONF(NETDEV_UP): %s: "
2481                                        "link is not ready\n",
2482                                        dev->name);
2483                                break;
2484                        }
2485
2486                        if (!idev && dev->mtu >= IPV6_MIN_MTU)
2487                                idev = ipv6_add_dev(dev);
2488
2489                        if (idev) {
2490                                idev->if_flags |= IF_READY;
2491                                run_pending = 1;
2492                        }
2493                } else {
2494                        if (!addrconf_qdisc_ok(dev)) {
2495                                /* device is still not ready. */
2496                                break;
2497                        }
2498
2499                        if (idev) {
2500                                if (idev->if_flags & IF_READY) {
2501                                        /* device is already configured. */
2502                                        break;
2503                                }
2504                                idev->if_flags |= IF_READY;
2505                        }
2506
2507                        printk(KERN_INFO
2508                                        "ADDRCONF(NETDEV_CHANGE): %s: "
2509                                        "link becomes ready\n",
2510                                        dev->name);
2511
2512                        run_pending = 1;
2513                }
2514
2515                switch(dev->type) {
2516#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2517                case ARPHRD_SIT:
2518                        addrconf_sit_config(dev);
2519                        break;
2520#endif
2521                case ARPHRD_TUNNEL6:
2522                        addrconf_ip6_tnl_config(dev);
2523                        break;
2524                case ARPHRD_LOOPBACK:
2525                        init_loopback(dev);
2526                        break;
2527
2528                default:
2529                        addrconf_dev_config(dev);
2530                        break;
2531                }
2532                if (idev) {
2533                        if (run_pending)
2534                                addrconf_dad_run(idev);
2535
2536                        /* If the MTU changed during the interface down, when the
2537                           interface up, the changed MTU must be reflected in the
2538                           idev as well as routers.
2539                         */
2540                        if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2541                                rt6_mtu_change(dev, dev->mtu);
2542                                idev->cnf.mtu6 = dev->mtu;
2543                        }
2544                        idev->tstamp = jiffies;
2545                        inet6_ifinfo_notify(RTM_NEWLINK, idev);
2546                        /* If the changed mtu during down is lower than IPV6_MIN_MTU
2547                           stop IPv6 on this interface.
2548                         */
2549                        if (dev->mtu < IPV6_MIN_MTU)
2550                                addrconf_ifdown(dev, event != NETDEV_DOWN);
2551                }
2552                break;
2553
2554        case NETDEV_CHANGEMTU:
2555                if (idev && dev->mtu >= IPV6_MIN_MTU) {
2556                        rt6_mtu_change(dev, dev->mtu);
2557                        idev->cnf.mtu6 = dev->mtu;
2558                        break;
2559                }
2560
2561                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2562                        idev = ipv6_add_dev(dev);
2563                        if (idev)
2564                                break;
2565                }
2566
2567                /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2568
2569        case NETDEV_DOWN:
2570        case NETDEV_UNREGISTER:
2571                /*
2572                 *      Remove all addresses from this interface.
2573                 */
2574                addrconf_ifdown(dev, event != NETDEV_DOWN);
2575                break;
2576
2577        case NETDEV_CHANGENAME:
2578                if (idev) {
2579                        snmp6_unregister_dev(idev);
2580                        addrconf_sysctl_unregister(idev);
2581                        addrconf_sysctl_register(idev);
2582                        err = snmp6_register_dev(idev);
2583                        if (err)
2584                                return notifier_from_errno(err);
2585                }
2586                break;
2587        case NETDEV_BONDING_OLDTYPE:
2588        case NETDEV_BONDING_NEWTYPE:
2589                addrconf_bonding_change(dev, event);
2590                break;
2591        }
2592
2593        return NOTIFY_OK;
2594}
2595
2596/*
2597 *      addrconf module should be notified of a device going up
2598 */
2599static struct notifier_block ipv6_dev_notf = {
2600        .notifier_call = addrconf_notify,
2601        .priority = 0
2602};
2603
2604static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2605{
2606        struct inet6_dev *idev;
2607        ASSERT_RTNL();
2608
2609        idev = __in6_dev_get(dev);
2610
2611        if (event == NETDEV_BONDING_NEWTYPE)
2612                ipv6_mc_remap(idev);
2613        else if (event == NETDEV_BONDING_OLDTYPE)
2614                ipv6_mc_unmap(idev);
2615}
2616
2617static int addrconf_ifdown(struct net_device *dev, int how)
2618{
2619        struct inet6_dev *idev;
2620        struct inet6_ifaddr *ifa, **bifa;
2621        struct net *net = dev_net(dev);
2622        int i;
2623
2624        ASSERT_RTNL();
2625
2626        rt6_ifdown(net, dev);
2627        neigh_ifdown(&nd_tbl, dev);
2628
2629        idev = __in6_dev_get(dev);
2630        if (idev == NULL)
2631                return -ENODEV;
2632
2633        /* Step 1: remove reference to ipv6 device from parent device.
2634                   Do not dev_put!
2635         */
2636        if (how) {
2637                idev->dead = 1;
2638
2639                /* protected by rtnl_lock */
2640                rcu_assign_pointer(dev->ip6_ptr, NULL);
2641
2642                /* Step 1.5: remove snmp6 entry */
2643                snmp6_unregister_dev(idev);
2644
2645        }
2646
2647        /* Step 2: clear hash table */
2648        for (i=0; i<IN6_ADDR_HSIZE; i++) {
2649                bifa = &inet6_addr_lst[i];
2650
2651                write_lock_bh(&addrconf_hash_lock);
2652                while ((ifa = *bifa) != NULL) {
2653                        if (ifa->idev == idev) {
2654                                *bifa = ifa->lst_next;
2655                                ifa->lst_next = NULL;
2656                                addrconf_del_timer(ifa);
2657                                in6_ifa_put(ifa);
2658                                continue;
2659                        }
2660                        bifa = &ifa->lst_next;
2661                }
2662                write_unlock_bh(&addrconf_hash_lock);
2663        }
2664
2665        write_lock_bh(&idev->lock);
2666
2667        /* Step 3: clear flags for stateless addrconf */
2668        if (!how)
2669                idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2670
2671        /* Step 4: clear address list */
2672#ifdef CONFIG_IPV6_PRIVACY
2673        if (how && del_timer(&idev->regen_timer))
2674                in6_dev_put(idev);
2675
2676        /* clear tempaddr list */
2677        while ((ifa = idev->tempaddr_list) != NULL) {
2678                idev->tempaddr_list = ifa->tmp_next;
2679                ifa->tmp_next = NULL;
2680                ifa->dead = 1;
2681                write_unlock_bh(&idev->lock);
2682                spin_lock_bh(&ifa->lock);
2683
2684                if (ifa->ifpub) {
2685                        in6_ifa_put(ifa->ifpub);
2686                        ifa->ifpub = NULL;
2687                }
2688                spin_unlock_bh(&ifa->lock);
2689                in6_ifa_put(ifa);
2690                write_lock_bh(&idev->lock);
2691        }
2692#endif
2693        while ((ifa = idev->addr_list) != NULL) {
2694                idev->addr_list = ifa->if_next;
2695                ifa->if_next = NULL;
2696                ifa->dead = 1;
2697                addrconf_del_timer(ifa);
2698                write_unlock_bh(&idev->lock);
2699
2700                __ipv6_ifa_notify(RTM_DELADDR, ifa);
2701                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2702                in6_ifa_put(ifa);
2703
2704                write_lock_bh(&idev->lock);
2705        }
2706        write_unlock_bh(&idev->lock);
2707
2708        /* Step 5: Discard multicast list */
2709
2710        if (how)
2711                ipv6_mc_destroy_dev(idev);
2712        else
2713                ipv6_mc_down(idev);
2714
2715        idev->tstamp = jiffies;
2716
2717        /* Shot the device (if unregistered) */
2718
2719        if (how) {
2720                addrconf_sysctl_unregister(idev);
2721                neigh_parms_release(&nd_tbl, idev->nd_parms);
2722                neigh_ifdown(&nd_tbl, dev);
2723                in6_dev_put(idev);
2724        }
2725        return 0;
2726}
2727
2728static void addrconf_rs_timer(unsigned long data)
2729{
2730        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2731
2732        if (ifp->idev->cnf.forwarding)
2733                goto out;
2734
2735        if (ifp->idev->if_flags & IF_RA_RCVD) {
2736                /*
2737                 *      Announcement received after solicitation
2738                 *      was sent
2739                 */
2740                goto out;
2741        }
2742
2743        spin_lock(&ifp->lock);
2744        if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2745                /* The wait after the last probe can be shorter */
2746                addrconf_mod_timer(ifp, AC_RS,
2747                                   (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2748                                   ifp->idev->cnf.rtr_solicit_delay :
2749                                   ifp->idev->cnf.rtr_solicit_interval);
2750                spin_unlock(&ifp->lock);
2751
2752                ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2753        } else {
2754                spin_unlock(&ifp->lock);
2755                /*
2756                 * Note: we do not support deprecated "all on-link"
2757                 * assumption any longer.
2758                 */
2759                printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2760                       ifp->idev->dev->name);
2761        }
2762
2763out:
2764        in6_ifa_put(ifp);
2765}
2766
2767/*
2768 *      Duplicate Address Detection
2769 */
2770static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2771{
2772        unsigned long rand_num;
2773        struct inet6_dev *idev = ifp->idev;
2774
2775        if (ifp->flags & IFA_F_OPTIMISTIC)
2776                rand_num = 0;
2777        else
2778                rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2779
2780        ifp->probes = idev->cnf.dad_transmits;
2781        addrconf_mod_timer(ifp, AC_DAD, rand_num);
2782}
2783
2784static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2785{
2786        struct inet6_dev *idev = ifp->idev;
2787        struct net_device *dev = idev->dev;
2788
2789        addrconf_join_solict(dev, &ifp->addr);
2790
2791        net_srandom(ifp->addr.s6_addr32[3]);
2792
2793        read_lock_bh(&idev->lock);
2794        if (ifp->dead)
2795                goto out;
2796        spin_lock_bh(&ifp->lock);
2797
2798        if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2799            idev->cnf.accept_dad < 1 ||
2800            !(ifp->flags&IFA_F_TENTATIVE) ||
2801            ifp->flags & IFA_F_NODAD) {
2802                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2803                spin_unlock_bh(&ifp->lock);
2804                read_unlock_bh(&idev->lock);
2805
2806                addrconf_dad_completed(ifp);
2807                return;
2808        }
2809
2810        if (!(idev->if_flags & IF_READY)) {
2811                spin_unlock_bh(&ifp->lock);
2812                read_unlock_bh(&idev->lock);
2813                /*
2814                 * If the device is not ready:
2815                 * - keep it tentative if it is a permanent address.
2816                 * - otherwise, kill it.
2817                 */
2818                in6_ifa_hold(ifp);
2819                addrconf_dad_stop(ifp, 0);
2820                return;
2821        }
2822
2823        /*
2824         * Optimistic nodes can start receiving
2825         * Frames right away
2826         */
2827        if(ifp->flags & IFA_F_OPTIMISTIC)
2828                ip6_ins_rt(ifp->rt);
2829
2830        addrconf_dad_kick(ifp);
2831        spin_unlock_bh(&ifp->lock);
2832out:
2833        read_unlock_bh(&idev->lock);
2834}
2835
2836static void addrconf_dad_timer(unsigned long data)
2837{
2838        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2839        struct inet6_dev *idev = ifp->idev;
2840        struct in6_addr mcaddr;
2841
2842        read_lock_bh(&idev->lock);
2843        if (idev->dead) {
2844                read_unlock_bh(&idev->lock);
2845                goto out;
2846        }
2847        spin_lock_bh(&ifp->lock);
2848        if (ifp->probes == 0) {
2849                /*
2850                 * DAD was successful
2851                 */
2852
2853                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2854                spin_unlock_bh(&ifp->lock);
2855                read_unlock_bh(&idev->lock);
2856
2857                addrconf_dad_completed(ifp);
2858
2859                goto out;
2860        }
2861
2862        ifp->probes--;
2863        addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2864        spin_unlock_bh(&ifp->lock);
2865        read_unlock_bh(&idev->lock);
2866
2867        /* send a neighbour solicitation for our addr */
2868        addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2869        ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2870out:
2871        in6_ifa_put(ifp);
2872}
2873
2874static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2875{
2876        struct net_device *     dev = ifp->idev->dev;
2877
2878        /*
2879         *      Configure the address for reception. Now it is valid.
2880         */
2881
2882        ipv6_ifa_notify(RTM_NEWADDR, ifp);
2883
2884        /* If added prefix is link local and forwarding is off,
2885           start sending router solicitations.
2886         */
2887
2888        if (ifp->idev->cnf.forwarding == 0 &&
2889            ifp->idev->cnf.rtr_solicits > 0 &&
2890            (dev->flags&IFF_LOOPBACK) == 0 &&
2891            (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2892                /*
2893                 *      If a host as already performed a random delay
2894                 *      [...] as part of DAD [...] there is no need
2895                 *      to delay again before sending the first RS
2896                 */
2897                ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2898
2899                spin_lock_bh(&ifp->lock);
2900                ifp->probes = 1;
2901                ifp->idev->if_flags |= IF_RS_SENT;
2902                addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2903                spin_unlock_bh(&ifp->lock);
2904        }
2905}
2906
2907static void addrconf_dad_run(struct inet6_dev *idev) {
2908        struct inet6_ifaddr *ifp;
2909
2910        read_lock_bh(&idev->lock);
2911        for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2912                spin_lock_bh(&ifp->lock);
2913                if (!(ifp->flags & IFA_F_TENTATIVE)) {
2914                        spin_unlock_bh(&ifp->lock);
2915                        continue;
2916                }
2917                spin_unlock_bh(&ifp->lock);
2918                addrconf_dad_kick(ifp);
2919        }
2920        read_unlock_bh(&idev->lock);
2921}
2922
2923#ifdef CONFIG_PROC_FS
2924struct if6_iter_state {
2925        struct seq_net_private p;
2926        int bucket;
2927};
2928
2929static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2930{
2931        struct inet6_ifaddr *ifa = NULL;
2932        struct if6_iter_state *state = seq->private;
2933        struct net *net = seq_file_net(seq);
2934
2935        for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2936                ifa = inet6_addr_lst[state->bucket];
2937
2938                while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2939                        ifa = ifa->lst_next;
2940                if (ifa)
2941                        break;
2942        }
2943        return ifa;
2944}
2945
2946static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2947{
2948        struct if6_iter_state *state = seq->private;
2949        struct net *net = seq_file_net(seq);
2950
2951        ifa = ifa->lst_next;
2952try_again:
2953        if (ifa) {
2954                if (!net_eq(dev_net(ifa->idev->dev), net)) {
2955                        ifa = ifa->lst_next;
2956                        goto try_again;
2957                }
2958        }
2959
2960        if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2961                ifa = inet6_addr_lst[state->bucket];
2962                goto try_again;
2963        }
2964
2965        return ifa;
2966}
2967
2968static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2969{
2970        struct inet6_ifaddr *ifa = if6_get_first(seq);
2971
2972        if (ifa)
2973                while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2974                        --pos;
2975        return pos ? NULL : ifa;
2976}
2977
2978static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2979        __acquires(addrconf_hash_lock)
2980{
2981        read_lock_bh(&addrconf_hash_lock);
2982        return if6_get_idx(seq, *pos);
2983}
2984
2985static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2986{
2987        struct inet6_ifaddr *ifa;
2988
2989        ifa = if6_get_next(seq, v);
2990        ++*pos;
2991        return ifa;
2992}
2993
2994static void if6_seq_stop(struct seq_file *seq, void *v)
2995        __releases(addrconf_hash_lock)
2996{
2997        read_unlock_bh(&addrconf_hash_lock);
2998}
2999
3000static int if6_seq_show(struct seq_file *seq, void *v)
3001{
3002        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3003        seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3004                   &ifp->addr,
3005                   ifp->idev->dev->ifindex,
3006                   ifp->prefix_len,
3007                   ifp->scope,
3008                   ifp->flags,
3009                   ifp->idev->dev->name);
3010        return 0;
3011}
3012
3013static const struct seq_operations if6_seq_ops = {
3014        .start  = if6_seq_start,
3015        .next   = if6_seq_next,
3016        .show   = if6_seq_show,
3017        .stop   = if6_seq_stop,
3018};
3019
3020static int if6_seq_open(struct inode *inode, struct file *file)
3021{
3022        return seq_open_net(inode, file, &if6_seq_ops,
3023                            sizeof(struct if6_iter_state));
3024}
3025
3026static const struct file_operations if6_fops = {
3027        .owner          = THIS_MODULE,
3028        .open           = if6_seq_open,
3029        .read           = seq_read,
3030        .llseek         = seq_lseek,
3031        .release        = seq_release_net,
3032};
3033
3034static int if6_proc_net_init(struct net *net)
3035{
3036        if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3037                return -ENOMEM;
3038        return 0;
3039}
3040
3041static void if6_proc_net_exit(struct net *net)
3042{
3043       proc_net_remove(net, "if_inet6");
3044}
3045
3046static struct pernet_operations if6_proc_net_ops = {
3047       .init = if6_proc_net_init,
3048       .exit = if6_proc_net_exit,
3049};
3050
3051int __init if6_proc_init(void)
3052{
3053        return register_pernet_subsys(&if6_proc_net_ops);
3054}
3055
3056void if6_proc_exit(void)
3057{
3058        unregister_pernet_subsys(&if6_proc_net_ops);
3059}
3060#endif  /* CONFIG_PROC_FS */
3061
3062#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3063/* Check if address is a home address configured on any interface. */
3064int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3065{
3066        int ret = 0;
3067        struct inet6_ifaddr * ifp;
3068        u8 hash = ipv6_addr_hash(addr);
3069        read_lock_bh(&addrconf_hash_lock);
3070        for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3071                if (!net_eq(dev_net(ifp->idev->dev), net))
3072                        continue;
3073                if (ipv6_addr_equal(&ifp->addr, addr) &&
3074                    (ifp->flags & IFA_F_HOMEADDRESS)) {
3075                        ret = 1;
3076                        break;
3077                }
3078        }
3079        read_unlock_bh(&addrconf_hash_lock);
3080        return ret;
3081}
3082#endif
3083
3084/*
3085 *      Periodic address status verification
3086 */
3087
3088static void addrconf_verify(unsigned long foo)
3089{
3090        struct inet6_ifaddr *ifp;
3091        unsigned long now, next;
3092        int i;
3093
3094        spin_lock_bh(&addrconf_verify_lock);
3095        now = jiffies;
3096        next = now + ADDR_CHECK_FREQUENCY;
3097
3098        del_timer(&addr_chk_timer);
3099
3100        for (i=0; i < IN6_ADDR_HSIZE; i++) {
3101
3102restart:
3103                read_lock(&addrconf_hash_lock);
3104                for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3105                        unsigned long age;
3106#ifdef CONFIG_IPV6_PRIVACY
3107                        unsigned long regen_advance;
3108#endif
3109
3110                        if (ifp->flags & IFA_F_PERMANENT)
3111                                continue;
3112
3113                        spin_lock(&ifp->lock);
3114                        age = (now - ifp->tstamp) / HZ;
3115
3116#ifdef CONFIG_IPV6_PRIVACY
3117                        regen_advance = ifp->idev->cnf.regen_max_retry *
3118                                        ifp->idev->cnf.dad_transmits *
3119                                        ifp->idev->nd_parms->retrans_time / HZ;
3120#endif
3121
3122                        if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3123                            age >= ifp->valid_lft) {
3124                                spin_unlock(&ifp->lock);
3125                                in6_ifa_hold(ifp);
3126                                read_unlock(&addrconf_hash_lock);
3127                                ipv6_del_addr(ifp);
3128                                goto restart;
3129                        } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3130                                spin_unlock(&ifp->lock);
3131                                continue;
3132                        } else if (age >= ifp->prefered_lft) {
3133                                /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3134                                int deprecate = 0;
3135
3136                                if (!(ifp->flags&IFA_F_DEPRECATED)) {
3137                                        deprecate = 1;
3138                                        ifp->flags |= IFA_F_DEPRECATED;
3139                                }
3140
3141                                if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3142                                        next = ifp->tstamp + ifp->valid_lft * HZ;
3143
3144                                spin_unlock(&ifp->lock);
3145
3146                                if (deprecate) {
3147                                        in6_ifa_hold(ifp);
3148                                        read_unlock(&addrconf_hash_lock);
3149
3150                                        ipv6_ifa_notify(0, ifp);
3151                                        in6_ifa_put(ifp);
3152                                        goto restart;
3153                                }
3154#ifdef CONFIG_IPV6_PRIVACY
3155                        } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3156                                   !(ifp->flags&IFA_F_TENTATIVE)) {
3157                                if (age >= ifp->prefered_lft - regen_advance) {
3158                                        struct inet6_ifaddr *ifpub = ifp->ifpub;
3159                                        if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3160                                                next = ifp->tstamp + ifp->prefered_lft * HZ;
3161                                        if (!ifp->regen_count && ifpub) {
3162                                                ifp->regen_count++;
3163                                                in6_ifa_hold(ifp);
3164                                                in6_ifa_hold(ifpub);
3165                                                spin_unlock(&ifp->lock);
3166                                                read_unlock(&addrconf_hash_lock);
3167                                                spin_lock(&ifpub->lock);
3168                                                ifpub->regen_count = 0;
3169                                                spin_unlock(&ifpub->lock);
3170                                                ipv6_create_tempaddr(ifpub, ifp);
3171                                                in6_ifa_put(ifpub);
3172                                                in6_ifa_put(ifp);
3173                                                goto restart;
3174                                        }
3175                                } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3176                                        next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3177                                spin_unlock(&ifp->lock);
3178#endif
3179                        } else {
3180                                /* ifp->prefered_lft <= ifp->valid_lft */
3181                                if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3182                                        next = ifp->tstamp + ifp->prefered_lft * HZ;
3183                                spin_unlock(&ifp->lock);
3184                        }
3185                }
3186                read_unlock(&addrconf_hash_lock);
3187        }
3188
3189        addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3190        add_timer(&addr_chk_timer);
3191        spin_unlock_bh(&addrconf_verify_lock);
3192}
3193
3194static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3195{
3196        struct in6_addr *pfx = NULL;
3197
3198        if (addr)
3199                pfx = nla_data(addr);
3200
3201        if (local) {
3202                if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3203                        pfx = NULL;
3204                else
3205                        pfx = nla_data(local);
3206        }
3207
3208        return pfx;
3209}
3210
3211static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3212        [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3213        [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3214        [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3215};
3216
3217static int
3218inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3219{
3220        struct net *net = sock_net(skb->sk);
3221        struct ifaddrmsg *ifm;
3222        struct nlattr *tb[IFA_MAX+1];
3223        struct in6_addr *pfx;
3224        int err;
3225
3226        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3227        if (err < 0)
3228                return err;
3229
3230        ifm = nlmsg_data(nlh);
3231        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3232        if (pfx == NULL)
3233                return -EINVAL;
3234
3235        return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3236}
3237
3238static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3239                             u32 prefered_lft, u32 valid_lft)
3240{
3241        u32 flags;
3242        clock_t expires;
3243        unsigned long timeout;
3244
3245        if (!valid_lft || (prefered_lft > valid_lft))
3246                return -EINVAL;
3247
3248        timeout = addrconf_timeout_fixup(valid_lft, HZ);
3249        if (addrconf_finite_timeout(timeout)) {
3250                expires = jiffies_to_clock_t(timeout * HZ);
3251                valid_lft = timeout;
3252                flags = RTF_EXPIRES;
3253        } else {
3254                expires = 0;
3255                flags = 0;
3256                ifa_flags |= IFA_F_PERMANENT;
3257        }
3258
3259        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3260        if (addrconf_finite_timeout(timeout)) {
3261                if (timeout == 0)
3262                        ifa_flags |= IFA_F_DEPRECATED;
3263                prefered_lft = timeout;
3264        }
3265
3266        spin_lock_bh(&ifp->lock);
3267        ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3268        ifp->tstamp = jiffies;
3269        ifp->valid_lft = valid_lft;
3270        ifp->prefered_lft = prefered_lft;
3271
3272        spin_unlock_bh(&ifp->lock);
3273        if (!(ifp->flags&IFA_F_TENTATIVE))
3274                ipv6_ifa_notify(0, ifp);
3275
3276        addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3277                              expires, flags);
3278        addrconf_verify(0);
3279
3280        return 0;
3281}
3282
3283static int
3284inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3285{
3286        struct net *net = sock_net(skb->sk);
3287        struct ifaddrmsg *ifm;
3288        struct nlattr *tb[IFA_MAX+1];
3289        struct in6_addr *pfx;
3290        struct inet6_ifaddr *ifa;
3291        struct net_device *dev;
3292        u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3293        u8 ifa_flags;
3294        int err;
3295
3296        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3297        if (err < 0)
3298                return err;
3299
3300        ifm = nlmsg_data(nlh);
3301        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3302        if (pfx == NULL)
3303                return -EINVAL;
3304
3305        if (tb[IFA_CACHEINFO]) {
3306                struct ifa_cacheinfo *ci;
3307
3308                ci = nla_data(tb[IFA_CACHEINFO]);
3309                valid_lft = ci->ifa_valid;
3310                preferred_lft = ci->ifa_prefered;
3311        } else {
3312                preferred_lft = INFINITY_LIFE_TIME;
3313                valid_lft = INFINITY_LIFE_TIME;
3314        }
3315
3316        dev =  __dev_get_by_index(net, ifm->ifa_index);
3317        if (dev == NULL)
3318                return -ENODEV;
3319
3320        /* We ignore other flags so far. */
3321        ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3322
3323        ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3324        if (ifa == NULL) {
3325                /*
3326                 * It would be best to check for !NLM_F_CREATE here but
3327                 * userspace alreay relies on not having to provide this.
3328                 */
3329                return inet6_addr_add(net, ifm->ifa_index, pfx,
3330                                      ifm->ifa_prefixlen, ifa_flags,
3331                                      preferred_lft, valid_lft);
3332        }
3333
3334        if (nlh->nlmsg_flags & NLM_F_EXCL ||
3335            !(nlh->nlmsg_flags & NLM_F_REPLACE))
3336                err = -EEXIST;
3337        else
3338                err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3339
3340        in6_ifa_put(ifa);
3341
3342        return err;
3343}
3344
3345static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3346                          u8 scope, int ifindex)
3347{
3348        struct ifaddrmsg *ifm;
3349
3350        ifm = nlmsg_data(nlh);
3351        ifm->ifa_family = AF_INET6;
3352        ifm->ifa_prefixlen = prefixlen;
3353        ifm->ifa_flags = flags;
3354        ifm->ifa_scope = scope;
3355        ifm->ifa_index = ifindex;
3356}
3357
3358static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3359                         unsigned long tstamp, u32 preferred, u32 valid)
3360{
3361        struct ifa_cacheinfo ci;
3362
3363        ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3364                        + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3365        ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3366                        + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3367        ci.ifa_prefered = preferred;
3368        ci.ifa_valid = valid;
3369
3370        return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3371}
3372
3373static inline int rt_scope(int ifa_scope)
3374{
3375        if (ifa_scope & IFA_HOST)
3376                return RT_SCOPE_HOST;
3377        else if (ifa_scope & IFA_LINK)
3378                return RT_SCOPE_LINK;
3379        else if (ifa_scope & IFA_SITE)
3380                return RT_SCOPE_SITE;
3381        else
3382                return RT_SCOPE_UNIVERSE;
3383}
3384
3385static inline int inet6_ifaddr_msgsize(void)
3386{
3387        return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3388               + nla_total_size(16) /* IFA_ADDRESS */
3389               + nla_total_size(sizeof(struct ifa_cacheinfo));
3390}
3391
3392static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3393                             u32 pid, u32 seq, int event, unsigned int flags)
3394{
3395        struct nlmsghdr  *nlh;
3396        u32 preferred, valid;
3397
3398        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3399        if (nlh == NULL)
3400                return -EMSGSIZE;
3401
3402        put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3403                      ifa->idev->dev->ifindex);
3404
3405        if (!(ifa->flags&IFA_F_PERMANENT)) {
3406                preferred = ifa->prefered_lft;
3407                valid = ifa->valid_lft;
3408                if (preferred != INFINITY_LIFE_TIME) {
3409                        long tval = (jiffies - ifa->tstamp)/HZ;
3410                        if (preferred > tval)
3411                                preferred -= tval;
3412                        else
3413                                preferred = 0;
3414                        if (valid != INFINITY_LIFE_TIME)
3415                                valid -= tval;
3416                }
3417        } else {
3418                preferred = INFINITY_LIFE_TIME;
3419                valid = INFINITY_LIFE_TIME;
3420        }
3421
3422        if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3423            put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3424                nlmsg_cancel(skb, nlh);
3425                return -EMSGSIZE;
3426        }
3427
3428        return nlmsg_end(skb, nlh);
3429}
3430
3431static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3432                                u32 pid, u32 seq, int event, u16 flags)
3433{
3434        struct nlmsghdr  *nlh;
3435        u8 scope = RT_SCOPE_UNIVERSE;
3436        int ifindex = ifmca->idev->dev->ifindex;
3437
3438        if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3439                scope = RT_SCOPE_SITE;
3440
3441        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3442        if (nlh == NULL)
3443                return -EMSGSIZE;
3444
3445        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3446        if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3447            put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3448                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3449                nlmsg_cancel(skb, nlh);
3450                return -EMSGSIZE;
3451        }
3452
3453        return nlmsg_end(skb, nlh);
3454}
3455
3456static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3457                                u32 pid, u32 seq, int event, unsigned int flags)
3458{
3459        struct nlmsghdr  *nlh;
3460        u8 scope = RT_SCOPE_UNIVERSE;
3461        int ifindex = ifaca->aca_idev->dev->ifindex;
3462
3463        if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3464                scope = RT_SCOPE_SITE;
3465
3466        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3467        if (nlh == NULL)
3468                return -EMSGSIZE;
3469
3470        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3471        if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3472            put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3473                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3474                nlmsg_cancel(skb, nlh);
3475                return -EMSGSIZE;
3476        }
3477
3478        return nlmsg_end(skb, nlh);
3479}
3480
3481enum addr_type_t
3482{
3483        UNICAST_ADDR,
3484        MULTICAST_ADDR,
3485        ANYCAST_ADDR,
3486};
3487
3488static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3489                           enum addr_type_t type)
3490{
3491        int idx, ip_idx;
3492        int s_idx, s_ip_idx;
3493        int err = 1;
3494        struct net_device *dev;
3495        struct inet6_dev *idev = NULL;
3496        struct inet6_ifaddr *ifa;
3497        struct ifmcaddr6 *ifmca;
3498        struct ifacaddr6 *ifaca;
3499        struct net *net = sock_net(skb->sk);
3500
3501        s_idx = cb->args[0];
3502        s_ip_idx = ip_idx = cb->args[1];
3503
3504        idx = 0;
3505        for_each_netdev(net, dev) {
3506                if (idx < s_idx)
3507                        goto cont;
3508                if (idx > s_idx)
3509                        s_ip_idx = 0;
3510                ip_idx = 0;
3511                if ((idev = in6_dev_get(dev)) == NULL)
3512                        goto cont;
3513                read_lock_bh(&idev->lock);
3514                switch (type) {
3515                case UNICAST_ADDR:
3516                        /* unicast address incl. temp addr */
3517                        for (ifa = idev->addr_list; ifa;
3518                             ifa = ifa->if_next, ip_idx++) {
3519                                if (ip_idx < s_ip_idx)
3520                                        continue;
3521                                err = inet6_fill_ifaddr(skb, ifa,
3522                                                        NETLINK_CB(cb->skb).pid,
3523                                                        cb->nlh->nlmsg_seq,
3524                                                        RTM_NEWADDR,
3525                                                        NLM_F_MULTI);
3526                        }
3527                        break;
3528                case MULTICAST_ADDR:
3529                        /* multicast address */
3530                        for (ifmca = idev->mc_list; ifmca;
3531                             ifmca = ifmca->next, ip_idx++) {
3532                                if (ip_idx < s_ip_idx)
3533                                        continue;
3534                                err = inet6_fill_ifmcaddr(skb, ifmca,
3535                                                          NETLINK_CB(cb->skb).pid,
3536                                                          cb->nlh->nlmsg_seq,
3537                                                          RTM_GETMULTICAST,
3538                                                          NLM_F_MULTI);
3539                        }
3540                        break;
3541                case ANYCAST_ADDR:
3542                        /* anycast address */
3543                        for (ifaca = idev->ac_list; ifaca;
3544                             ifaca = ifaca->aca_next, ip_idx++) {
3545                                if (ip_idx < s_ip_idx)
3546                                        continue;
3547                                err = inet6_fill_ifacaddr(skb, ifaca,
3548                                                          NETLINK_CB(cb->skb).pid,
3549                                                          cb->nlh->nlmsg_seq,
3550                                                          RTM_GETANYCAST,
3551                                                          NLM_F_MULTI);
3552                        }
3553                        break;
3554                default:
3555                        break;
3556                }
3557                read_unlock_bh(&idev->lock);
3558                in6_dev_put(idev);
3559
3560                if (err <= 0)
3561                        break;
3562cont:
3563                idx++;
3564        }
3565        cb->args[0] = idx;
3566        cb->args[1] = ip_idx;
3567        return skb->len;
3568}
3569
3570static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3571{
3572        enum addr_type_t type = UNICAST_ADDR;
3573
3574        return inet6_dump_addr(skb, cb, type);
3575}
3576
3577static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3578{
3579        enum addr_type_t type = MULTICAST_ADDR;
3580
3581        return inet6_dump_addr(skb, cb, type);
3582}
3583
3584
3585static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3586{
3587        enum addr_type_t type = ANYCAST_ADDR;
3588
3589        return inet6_dump_addr(skb, cb, type);
3590}
3591
3592static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3593                             void *arg)
3594{
3595        struct net *net = sock_net(in_skb->sk);
3596        struct ifaddrmsg *ifm;
3597        struct nlattr *tb[IFA_MAX+1];
3598        struct in6_addr *addr = NULL;
3599        struct net_device *dev = NULL;
3600        struct inet6_ifaddr *ifa;
3601        struct sk_buff *skb;
3602        int err;
3603
3604        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3605        if (err < 0)
3606                goto errout;
3607
3608        addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3609        if (addr == NULL) {
3610                err = -EINVAL;
3611                goto errout;
3612        }
3613
3614        ifm = nlmsg_data(nlh);
3615        if (ifm->ifa_index)
3616                dev = __dev_get_by_index(net, ifm->ifa_index);
3617
3618        if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3619                err = -EADDRNOTAVAIL;
3620                goto errout;
3621        }
3622
3623        if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3624                err = -ENOBUFS;
3625                goto errout_ifa;
3626        }
3627
3628        err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3629                                nlh->nlmsg_seq, RTM_NEWADDR, 0);
3630        if (err < 0) {
3631                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3632                WARN_ON(err == -EMSGSIZE);
3633                kfree_skb(skb);
3634                goto errout_ifa;
3635        }
3636        err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3637errout_ifa:
3638        in6_ifa_put(ifa);
3639errout:
3640        return err;
3641}
3642
3643static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3644{
3645        struct sk_buff *skb;
3646        struct net *net = dev_net(ifa->idev->dev);
3647        int err = -ENOBUFS;
3648
3649        skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3650        if (skb == NULL)
3651                goto errout;
3652
3653        err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3654        if (err < 0) {
3655                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3656                WARN_ON(err == -EMSGSIZE);
3657                kfree_skb(skb);
3658                goto errout;
3659        }
3660        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3661        return;
3662errout:
3663        if (err < 0)
3664                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3665}
3666
3667static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3668                                __s32 *array, int bytes)
3669{
3670        BUG_ON(bytes < (DEVCONF_MAX * 4));
3671
3672        memset(array, 0, bytes);
3673        array[DEVCONF_FORWARDING] = cnf->forwarding;
3674        array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3675        array[DEVCONF_MTU6] = cnf->mtu6;
3676        array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3677        array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3678        array[DEVCONF_AUTOCONF] = cnf->autoconf;
3679        array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3680        array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3681        array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3682        array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3683        array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3684#ifdef CONFIG_IPV6_PRIVACY
3685        array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3686        array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3687        array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3688        array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3689        array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3690#endif
3691        array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3692        array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3693        array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3694#ifdef CONFIG_IPV6_ROUTER_PREF
3695        array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3696        array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3697#ifdef CONFIG_IPV6_ROUTE_INFO
3698        array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3699#endif
3700#endif
3701        array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3702        array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3703#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3704        array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3705#endif
3706#ifdef CONFIG_IPV6_MROUTE
3707        array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3708#endif
3709        array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3710        array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3711}
3712
3713static inline size_t inet6_if_nlmsg_size(void)
3714{
3715        return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3716               + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3717               + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3718               + nla_total_size(4) /* IFLA_MTU */
3719               + nla_total_size(4) /* IFLA_LINK */
3720               + nla_total_size( /* IFLA_PROTINFO */
3721                        nla_total_size(4) /* IFLA_INET6_FLAGS */
3722                        + nla_total_size(sizeof(struct ifla_cacheinfo))
3723                        + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3724                        + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3725                        + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3726                 );
3727}
3728
3729static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3730                                      int bytes)
3731{
3732        int i;
3733        int pad = bytes - sizeof(u64) * items;
3734        BUG_ON(pad < 0);
3735
3736        /* Use put_unaligned() because stats may not be aligned for u64. */
3737        put_unaligned(items, &stats[0]);
3738        for (i = 1; i < items; i++)
3739                put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3740
3741        memset(&stats[items], 0, pad);
3742}
3743
3744static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3745                             int bytes)
3746{
3747        switch(attrtype) {
3748        case IFLA_INET6_STATS:
3749                __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3750                break;
3751        case IFLA_INET6_ICMP6STATS:
3752                __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3753                break;
3754        }
3755}
3756
3757static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3758                             u32 pid, u32 seq, int event, unsigned int flags)
3759{
3760        struct net_device *dev = idev->dev;
3761        struct nlattr *nla;
3762        struct ifinfomsg *hdr;
3763        struct nlmsghdr *nlh;
3764        void *protoinfo;
3765        struct ifla_cacheinfo ci;
3766
3767        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3768        if (nlh == NULL)
3769                return -EMSGSIZE;
3770
3771        hdr = nlmsg_data(nlh);
3772        hdr->ifi_family = AF_INET6;
3773        hdr->__ifi_pad = 0;
3774        hdr->ifi_type = dev->type;
3775        hdr->ifi_index = dev->ifindex;
3776        hdr->ifi_flags = dev_get_flags(dev);
3777        hdr->ifi_change = 0;
3778
3779        NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3780
3781        if (dev->addr_len)
3782                NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3783
3784        NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3785        if (dev->ifindex != dev->iflink)
3786                NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3787
3788        protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3789        if (protoinfo == NULL)
3790                goto nla_put_failure;
3791
3792        NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3793
3794        ci.max_reasm_len = IPV6_MAXPLEN;
3795        ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3796                    + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3797        ci.reachable_time = idev->nd_parms->reachable_time;
3798        ci.retrans_time = idev->nd_parms->retrans_time;
3799        NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3800
3801        nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3802        if (nla == NULL)
3803                goto nla_put_failure;
3804        ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3805
3806        /* XXX - MC not implemented */
3807
3808        nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3809        if (nla == NULL)
3810                goto nla_put_failure;
3811        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3812
3813        nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3814        if (nla == NULL)
3815                goto nla_put_failure;
3816        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3817
3818        nla_nest_end(skb, protoinfo);
3819        return nlmsg_end(skb, nlh);
3820
3821nla_put_failure:
3822        nlmsg_cancel(skb, nlh);
3823        return -EMSGSIZE;
3824}
3825
3826static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3827{
3828        struct net *net = sock_net(skb->sk);
3829        int idx, err;
3830        int s_idx = cb->args[0];
3831        struct net_device *dev;
3832        struct inet6_dev *idev;
3833
3834        read_lock(&dev_base_lock);
3835        idx = 0;
3836        for_each_netdev(net, dev) {
3837                if (idx < s_idx)
3838                        goto cont;
3839                if ((idev = in6_dev_get(dev)) == NULL)
3840                        goto cont;
3841                err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3842                                cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3843                in6_dev_put(idev);
3844                if (err <= 0)
3845                        break;
3846cont:
3847                idx++;
3848        }
3849        read_unlock(&dev_base_lock);
3850        cb->args[0] = idx;
3851
3852        return skb->len;
3853}
3854
3855void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3856{
3857        struct sk_buff *skb;
3858        struct net *net = dev_net(idev->dev);
3859        int err = -ENOBUFS;
3860
3861        skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3862        if (skb == NULL)
3863                goto errout;
3864
3865        err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3866        if (err < 0) {
3867                /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3868                WARN_ON(err == -EMSGSIZE);
3869                kfree_skb(skb);
3870                goto errout;
3871        }
3872        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3873        return;
3874errout:
3875        if (err < 0)
3876                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3877}
3878
3879static inline size_t inet6_prefix_nlmsg_size(void)
3880{
3881        return NLMSG_ALIGN(sizeof(struct prefixmsg))
3882               + nla_total_size(sizeof(struct in6_addr))
3883               + nla_total_size(sizeof(struct prefix_cacheinfo));
3884}
3885
3886static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3887                             struct prefix_info *pinfo, u32 pid, u32 seq,
3888                             int event, unsigned int flags)
3889{
3890        struct prefixmsg *pmsg;
3891        struct nlmsghdr *nlh;
3892        struct prefix_cacheinfo ci;
3893
3894        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3895        if (nlh == NULL)
3896                return -EMSGSIZE;
3897
3898        pmsg = nlmsg_data(nlh);
3899        pmsg->prefix_family = AF_INET6;
3900        pmsg->prefix_pad1 = 0;
3901        pmsg->prefix_pad2 = 0;
3902        pmsg->prefix_ifindex = idev->dev->ifindex;
3903        pmsg->prefix_len = pinfo->prefix_len;
3904        pmsg->prefix_type = pinfo->type;
3905        pmsg->prefix_pad3 = 0;
3906        pmsg->prefix_flags = 0;
3907        if (pinfo->onlink)
3908                pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3909        if (pinfo->autoconf)
3910                pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3911
3912        NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3913
3914        ci.preferred_time = ntohl(pinfo->prefered);
3915        ci.valid_time = ntohl(pinfo->valid);
3916        NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3917
3918        return nlmsg_end(skb, nlh);
3919
3920nla_put_failure:
3921        nlmsg_cancel(skb, nlh);
3922        return -EMSGSIZE;
3923}
3924
3925static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3926                         struct prefix_info *pinfo)
3927{
3928        struct sk_buff *skb;
3929        struct net *net = dev_net(idev->dev);
3930        int err = -ENOBUFS;
3931
3932        skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3933        if (skb == NULL)
3934                goto errout;
3935
3936        err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3937        if (err < 0) {
3938                /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3939                WARN_ON(err == -EMSGSIZE);
3940                kfree_skb(skb);
3941                goto errout;
3942        }
3943        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3944        return;
3945errout:
3946        if (err < 0)
3947                rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3948}
3949
3950static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3951{
3952        inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3953
3954        switch (event) {
3955        case RTM_NEWADDR:
3956                /*
3957                 * If the address was optimistic
3958                 * we inserted the route at the start of
3959                 * our DAD process, so we don't need
3960                 * to do it again
3961                 */
3962                if (!(ifp->rt->rt6i_node))
3963                        ip6_ins_rt(ifp->rt);
3964                if (ifp->idev->cnf.forwarding)
3965                        addrconf_join_anycast(ifp);
3966                break;
3967        case RTM_DELADDR:
3968                if (ifp->idev->cnf.forwarding)
3969                        addrconf_leave_anycast(ifp);
3970                addrconf_leave_solict(ifp->idev, &ifp->addr);
3971                dst_hold(&ifp->rt->u.dst);
3972                if (ip6_del_rt(ifp->rt))
3973                        dst_free(&ifp->rt->u.dst);
3974                break;
3975        }
3976}
3977
3978static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3979{
3980        rcu_read_lock_bh();
3981        if (likely(ifp->idev->dead == 0))
3982                __ipv6_ifa_notify(event, ifp);
3983        rcu_read_unlock_bh();
3984}
3985
3986#ifdef CONFIG_SYSCTL
3987
3988static
3989int addrconf_sysctl_forward(ctl_table *ctl, int write,
3990                           void __user *buffer, size_t *lenp, loff_t *ppos)
3991{
3992        int *valp = ctl->data;
3993        int val = *valp;
3994        int ret;
3995
3996        ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
3997
3998        if (write)
3999                ret = addrconf_fixup_forwarding(ctl, valp, val);
4000        return ret;
4001}
4002
4003static int addrconf_sysctl_forward_strategy(ctl_table *table,
4004                                            void __user *oldval,
4005                                            size_t __user *oldlenp,
4006                                            void __user *newval, size_t newlen)
4007{
4008        int *valp = table->data;
4009        int val = *valp;
4010        int new;
4011
4012        if (!newval || !newlen)
4013                return 0;
4014        if (newlen != sizeof(int))
4015                return -EINVAL;
4016        if (get_user(new, (int __user *)newval))
4017                return -EFAULT;
4018        if (new == *valp)
4019                return 0;
4020        if (oldval && oldlenp) {
4021                size_t len;
4022                if (get_user(len, oldlenp))
4023                        return -EFAULT;
4024                if (len) {
4025                        if (len > table->maxlen)
4026                                len = table->maxlen;
4027                        if (copy_to_user(oldval, valp, len))
4028                                return -EFAULT;
4029                        if (put_user(len, oldlenp))
4030                                return -EFAULT;
4031                }
4032        }
4033
4034        *valp = new;
4035        return addrconf_fixup_forwarding(table, valp, val);
4036}
4037
4038static void dev_disable_change(struct inet6_dev *idev)
4039{
4040        if (!idev || !idev->dev)
4041                return;
4042
4043        if (idev->cnf.disable_ipv6)
4044                addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4045        else
4046                addrconf_notify(NULL, NETDEV_UP, idev->dev);
4047}
4048
4049static void addrconf_disable_change(struct net *net, __s32 newf)
4050{
4051        struct net_device *dev;
4052        struct inet6_dev *idev;
4053
4054        read_lock(&dev_base_lock);
4055        for_each_netdev(net, dev) {
4056                rcu_read_lock();
4057                idev = __in6_dev_get(dev);
4058                if (idev) {
4059                        int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4060                        idev->cnf.disable_ipv6 = newf;
4061                        if (changed)
4062                                dev_disable_change(idev);
4063                }
4064                rcu_read_unlock();
4065        }
4066        read_unlock(&dev_base_lock);
4067}
4068
4069static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4070{
4071        struct net *net;
4072
4073        net = (struct net *)table->extra2;
4074
4075        if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4076                return 0;
4077
4078        if (!rtnl_trylock())
4079                return restart_syscall();
4080
4081        if (p == &net->ipv6.devconf_all->disable_ipv6) {
4082                __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4083                net->ipv6.devconf_dflt->disable_ipv6 = newf;
4084                addrconf_disable_change(net, newf);
4085        } else if ((!*p) ^ (!old))
4086                dev_disable_change((struct inet6_dev *)table->extra1);
4087
4088        rtnl_unlock();
4089        return 0;
4090}
4091
4092static
4093int addrconf_sysctl_disable(ctl_table *ctl, int write,
4094                            void __user *buffer, size_t *lenp, loff_t *ppos)
4095{
4096        int *valp = ctl->data;
4097        int val = *valp;
4098        int ret;
4099
4100        ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4101
4102        if (write)
4103                ret = addrconf_disable_ipv6(ctl, valp, val);
4104        return ret;
4105}
4106
4107static struct addrconf_sysctl_table
4108{
4109        struct ctl_table_header *sysctl_header;
4110        ctl_table addrconf_vars[DEVCONF_MAX+1];
4111        char *dev_name;
4112} addrconf_sysctl __read_mostly = {
4113        .sysctl_header = NULL,
4114        .addrconf_vars = {
4115                {
4116                        .ctl_name       =       NET_IPV6_FORWARDING,
4117                        .procname       =       "forwarding",
4118                        .data           =       &ipv6_devconf.forwarding,
4119                        .maxlen         =       sizeof(int),
4120                        .mode           =       0644,
4121                        .proc_handler   =       addrconf_sysctl_forward,
4122                        .strategy       =       addrconf_sysctl_forward_strategy,
4123                },
4124                {
4125                        .ctl_name       =       NET_IPV6_HOP_LIMIT,
4126                        .procname       =       "hop_limit",
4127                        .data           =       &ipv6_devconf.hop_limit,
4128                        .maxlen         =       sizeof(int),
4129                        .mode           =       0644,
4130                        .proc_handler   =       proc_dointvec,
4131                },
4132                {
4133                        .ctl_name       =       NET_IPV6_MTU,
4134                        .procname       =       "mtu",
4135                        .data           =       &ipv6_devconf.mtu6,
4136                        .maxlen         =       sizeof(int),
4137                        .mode           =       0644,
4138                        .proc_handler   =       proc_dointvec,
4139                },
4140                {
4141                        .ctl_name       =       NET_IPV6_ACCEPT_RA,
4142                        .procname       =       "accept_ra",
4143                        .data           =       &ipv6_devconf.accept_ra,
4144                        .maxlen         =       sizeof(int),
4145                        .mode           =       0644,
4146                        .proc_handler   =       proc_dointvec,
4147                },
4148                {
4149                        .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
4150                        .procname       =       "accept_redirects",
4151                        .data           =       &ipv6_devconf.accept_redirects,
4152                        .maxlen         =       sizeof(int),
4153                        .mode           =       0644,
4154                        .proc_handler   =       proc_dointvec,
4155                },
4156                {
4157                        .ctl_name       =       NET_IPV6_AUTOCONF,
4158                        .procname       =       "autoconf",
4159                        .data           =       &ipv6_devconf.autoconf,
4160                        .maxlen         =       sizeof(int),
4161                        .mode           =       0644,
4162                        .proc_handler   =       proc_dointvec,
4163                },
4164                {
4165                        .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
4166                        .procname       =       "dad_transmits",
4167                        .data           =       &ipv6_devconf.dad_transmits,
4168                        .maxlen         =       sizeof(int),
4169                        .mode           =       0644,
4170                        .proc_handler   =       proc_dointvec,
4171                },
4172                {
4173                        .ctl_name       =       NET_IPV6_RTR_SOLICITS,
4174                        .procname       =       "router_solicitations",
4175                        .data           =       &ipv6_devconf.rtr_solicits,
4176                        .maxlen         =       sizeof(int),
4177                        .mode           =       0644,
4178                        .proc_handler   =       proc_dointvec,
4179                },
4180                {
4181                        .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
4182                        .procname       =       "router_solicitation_interval",
4183                        .data           =       &ipv6_devconf.rtr_solicit_interval,
4184                        .maxlen         =       sizeof(int),
4185                        .mode           =       0644,
4186                        .proc_handler   =       proc_dointvec_jiffies,
4187                        .strategy       =       sysctl_jiffies,
4188                },
4189                {
4190                        .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
4191                        .procname       =       "router_solicitation_delay",
4192                        .data           =       &ipv6_devconf.rtr_solicit_delay,
4193                        .maxlen         =       sizeof(int),
4194                        .mode           =       0644,
4195                        .proc_handler   =       proc_dointvec_jiffies,
4196                        .strategy       =       sysctl_jiffies,
4197                },
4198                {
4199                        .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
4200                        .procname       =       "force_mld_version",
4201                        .data           =       &ipv6_devconf.force_mld_version,
4202                        .maxlen         =       sizeof(int),
4203                        .mode           =       0644,
4204                        .proc_handler   =       proc_dointvec,
4205                },
4206#ifdef CONFIG_IPV6_PRIVACY
4207                {
4208                        .ctl_name       =       NET_IPV6_USE_TEMPADDR,
4209                        .procname       =       "use_tempaddr",
4210                        .data           =       &ipv6_devconf.use_tempaddr,
4211                        .maxlen         =       sizeof(int),
4212                        .mode           =       0644,
4213                        .proc_handler   =       proc_dointvec,
4214                },
4215                {
4216                        .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
4217                        .procname       =       "temp_valid_lft",
4218                        .data           =       &ipv6_devconf.temp_valid_lft,
4219                        .maxlen         =       sizeof(int),
4220                        .mode           =       0644,
4221                        .proc_handler   =       proc_dointvec,
4222                },
4223                {
4224                        .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4225                        .procname       =       "temp_prefered_lft",
4226                        .data           =       &ipv6_devconf.temp_prefered_lft,
4227                        .maxlen         =       sizeof(int),
4228                        .mode           =       0644,
4229                        .proc_handler   =       proc_dointvec,
4230                },
4231                {
4232                        .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4233                        .procname       =       "regen_max_retry",
4234                        .data           =       &ipv6_devconf.regen_max_retry,
4235                        .maxlen         =       sizeof(int),
4236                        .mode           =       0644,
4237                        .proc_handler   =       proc_dointvec,
4238                },
4239                {
4240                        .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4241                        .procname       =       "max_desync_factor",
4242                        .data           =       &ipv6_devconf.max_desync_factor,
4243                        .maxlen         =       sizeof(int),
4244                        .mode           =       0644,
4245                        .proc_handler   =       proc_dointvec,
4246                },
4247#endif
4248                {
4249                        .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4250                        .procname       =       "max_addresses",
4251                        .data           =       &ipv6_devconf.max_addresses,
4252                        .maxlen         =       sizeof(int),
4253                        .mode           =       0644,
4254                        .proc_handler   =       proc_dointvec,
4255                },
4256                {
4257                        .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4258                        .procname       =       "accept_ra_defrtr",
4259                        .data           =       &ipv6_devconf.accept_ra_defrtr,
4260                        .maxlen         =       sizeof(int),
4261                        .mode           =       0644,
4262                        .proc_handler   =       proc_dointvec,
4263                },
4264                {
4265                        .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4266                        .procname       =       "accept_ra_pinfo",
4267                        .data           =       &ipv6_devconf.accept_ra_pinfo,
4268                        .maxlen         =       sizeof(int),
4269                        .mode           =       0644,
4270                        .proc_handler   =       proc_dointvec,
4271                },
4272#ifdef CONFIG_IPV6_ROUTER_PREF
4273                {
4274                        .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4275                        .procname       =       "accept_ra_rtr_pref",
4276                        .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4277                        .maxlen         =       sizeof(int),
4278                        .mode           =       0644,
4279                        .proc_handler   =       proc_dointvec,
4280                },
4281                {
4282                        .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4283                        .procname       =       "router_probe_interval",
4284                        .data           =       &ipv6_devconf.rtr_probe_interval,
4285                        .maxlen         =       sizeof(int),
4286                        .mode           =       0644,
4287                        .proc_handler   =       proc_dointvec_jiffies,
4288                        .strategy       =       sysctl_jiffies,
4289                },
4290#ifdef CONFIG_IPV6_ROUTE_INFO
4291                {
4292                        .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4293                        .procname       =       "accept_ra_rt_info_max_plen",
4294                        .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4295                        .maxlen         =       sizeof(int),
4296                        .mode           =       0644,
4297                        .proc_handler   =       proc_dointvec,
4298                },
4299#endif
4300#endif
4301                {
4302                        .ctl_name       =       NET_IPV6_PROXY_NDP,
4303                        .procname       =       "proxy_ndp",
4304                        .data           =       &ipv6_devconf.proxy_ndp,
4305                        .maxlen         =       sizeof(int),
4306                        .mode           =       0644,
4307                        .proc_handler   =       proc_dointvec,
4308                },
4309                {
4310                        .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4311                        .procname       =       "accept_source_route",
4312                        .data           =       &ipv6_devconf.accept_source_route,
4313                        .maxlen         =       sizeof(int),
4314                        .mode           =       0644,
4315                        .proc_handler   =       proc_dointvec,
4316                },
4317#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4318                {
4319                        .ctl_name       =       CTL_UNNUMBERED,
4320                        .procname       =       "optimistic_dad",
4321                        .data           =       &ipv6_devconf.optimistic_dad,
4322                        .maxlen         =       sizeof(int),
4323                        .mode           =       0644,
4324                        .proc_handler   =       proc_dointvec,
4325
4326                },
4327#endif
4328#ifdef CONFIG_IPV6_MROUTE
4329                {
4330                        .ctl_name       =       CTL_UNNUMBERED,
4331                        .procname       =       "mc_forwarding",
4332                        .data           =       &ipv6_devconf.mc_forwarding,
4333                        .maxlen         =       sizeof(int),
4334                        .mode           =       0444,
4335                        .proc_handler   =       proc_dointvec,
4336                },
4337#endif
4338                {
4339                        .ctl_name       =       CTL_UNNUMBERED,
4340                        .procname       =       "disable_ipv6",
4341                        .data           =       &ipv6_devconf.disable_ipv6,
4342                        .maxlen         =       sizeof(int),
4343                        .mode           =       0644,
4344                        .proc_handler   =       addrconf_sysctl_disable,
4345                        .strategy       =       sysctl_intvec,
4346                },
4347                {
4348                        .ctl_name       =       CTL_UNNUMBERED,
4349                        .procname       =       "accept_dad",
4350                        .data           =       &ipv6_devconf.accept_dad,
4351                        .maxlen         =       sizeof(int),
4352                        .mode           =       0644,
4353                        .proc_handler   =       proc_dointvec,
4354                },
4355                {
4356                        .ctl_name       =       0,      /* sentinel */
4357                }
4358        },
4359};
4360
4361static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4362                int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4363{
4364        int i;
4365        struct addrconf_sysctl_table *t;
4366
4367#define ADDRCONF_CTL_PATH_DEV   3
4368
4369        struct ctl_path addrconf_ctl_path[] = {
4370                { .procname = "net", .ctl_name = CTL_NET, },
4371                { .procname = "ipv6", .ctl_name = NET_IPV6, },
4372                { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4373                { /* to be set */ },
4374                { },
4375        };
4376
4377
4378        t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4379        if (t == NULL)
4380                goto out;
4381
4382        for (i=0; t->addrconf_vars[i].data; i++) {
4383                t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4384                t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4385                t->addrconf_vars[i].extra2 = net;
4386        }
4387
4388        /*
4389         * Make a copy of dev_name, because '.procname' is regarded as const
4390         * by sysctl and we wouldn't want anyone to change it under our feet
4391         * (see SIOCSIFNAME).
4392         */
4393        t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4394        if (!t->dev_name)
4395                goto free;
4396
4397        addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4398        addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4399
4400        t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4401                        t->addrconf_vars);
4402        if (t->sysctl_header == NULL)
4403                goto free_procname;
4404
4405        p->sysctl = t;
4406        return 0;
4407
4408free_procname:
4409        kfree(t->dev_name);
4410free:
4411        kfree(t);
4412out:
4413        return -ENOBUFS;
4414}
4415
4416static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4417{
4418        struct addrconf_sysctl_table *t;
4419
4420        if (p->sysctl == NULL)
4421                return;
4422
4423        t = p->sysctl;
4424        p->sysctl = NULL;
4425        unregister_sysctl_table(t->sysctl_header);
4426        kfree(t->dev_name);
4427        kfree(t);
4428}
4429
4430static void addrconf_sysctl_register(struct inet6_dev *idev)
4431{
4432        neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4433                              NET_IPV6_NEIGH, "ipv6",
4434                              &ndisc_ifinfo_sysctl_change,
4435                              ndisc_ifinfo_sysctl_strategy);
4436        __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4437                        idev->dev->ifindex, idev, &idev->cnf);
4438}
4439
4440static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4441{
4442        __addrconf_sysctl_unregister(&idev->cnf);
4443        neigh_sysctl_unregister(idev->nd_parms);
4444}
4445
4446
4447#endif
4448
4449static int addrconf_init_net(struct net *net)
4450{
4451        int err;
4452        struct ipv6_devconf *all, *dflt;
4453
4454        err = -ENOMEM;
4455        all = &ipv6_devconf;
4456        dflt = &ipv6_devconf_dflt;
4457
4458        if (net != &init_net) {
4459                all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4460                if (all == NULL)
4461                        goto err_alloc_all;
4462
4463                dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4464                if (dflt == NULL)
4465                        goto err_alloc_dflt;
4466        } else {
4467                /* these will be inherited by all namespaces */
4468                dflt->autoconf = ipv6_defaults.autoconf;
4469                dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4470        }
4471
4472        net->ipv6.devconf_all = all;
4473        net->ipv6.devconf_dflt = dflt;
4474
4475#ifdef CONFIG_SYSCTL
4476        err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4477                        NULL, all);
4478        if (err < 0)
4479                goto err_reg_all;
4480
4481        err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4482                        NULL, dflt);
4483        if (err < 0)
4484                goto err_reg_dflt;
4485#endif
4486        return 0;
4487
4488#ifdef CONFIG_SYSCTL
4489err_reg_dflt:
4490        __addrconf_sysctl_unregister(all);
4491err_reg_all:
4492        kfree(dflt);
4493#endif
4494err_alloc_dflt:
4495        kfree(all);
4496err_alloc_all:
4497        return err;
4498}
4499
4500static void addrconf_exit_net(struct net *net)
4501{
4502#ifdef CONFIG_SYSCTL
4503        __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4504        __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4505#endif
4506        if (net != &init_net) {
4507                kfree(net->ipv6.devconf_dflt);
4508                kfree(net->ipv6.devconf_all);
4509        }
4510}
4511
4512static struct pernet_operations addrconf_ops = {
4513        .init = addrconf_init_net,
4514        .exit = addrconf_exit_net,
4515};
4516
4517/*
4518 *      Device notifier
4519 */
4520
4521int register_inet6addr_notifier(struct notifier_block *nb)
4522{
4523        return atomic_notifier_chain_register(&inet6addr_chain, nb);
4524}
4525
4526EXPORT_SYMBOL(register_inet6addr_notifier);
4527
4528int unregister_inet6addr_notifier(struct notifier_block *nb)
4529{
4530        return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4531}
4532
4533EXPORT_SYMBOL(unregister_inet6addr_notifier);
4534
4535/*
4536 *      Init / cleanup code
4537 */
4538
4539int __init addrconf_init(void)
4540{
4541        int err;
4542
4543        if ((err = ipv6_addr_label_init()) < 0) {
4544                printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4545                        err);
4546                return err;
4547        }
4548
4549        register_pernet_subsys(&addrconf_ops);
4550
4551        /* The addrconf netdev notifier requires that loopback_dev
4552         * has it's ipv6 private information allocated and setup
4553         * before it can bring up and give link-local addresses
4554         * to other devices which are up.
4555         *
4556         * Unfortunately, loopback_dev is not necessarily the first
4557         * entry in the global dev_base list of net devices.  In fact,
4558         * it is likely to be the very last entry on that list.
4559         * So this causes the notifier registry below to try and
4560         * give link-local addresses to all devices besides loopback_dev
4561         * first, then loopback_dev, which cases all the non-loopback_dev
4562         * devices to fail to get a link-local address.
4563         *
4564         * So, as a temporary fix, allocate the ipv6 structure for
4565         * loopback_dev first by hand.
4566         * Longer term, all of the dependencies ipv6 has upon the loopback
4567         * device and it being up should be removed.
4568         */
4569        rtnl_lock();
4570        if (!ipv6_add_dev(init_net.loopback_dev))
4571                err = -ENOMEM;
4572        rtnl_unlock();
4573        if (err)
4574                goto errlo;
4575
4576        register_netdevice_notifier(&ipv6_dev_notf);
4577
4578        addrconf_verify(0);
4579
4580        err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4581        if (err < 0)
4582                goto errout;
4583
4584        /* Only the first call to __rtnl_register can fail */
4585        __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4586        __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4587        __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4588        __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4589        __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4590
4591        ipv6_addr_label_rtnl_register();
4592
4593        return 0;
4594errout:
4595        unregister_netdevice_notifier(&ipv6_dev_notf);
4596errlo:
4597        unregister_pernet_subsys(&addrconf_ops);
4598
4599        return err;
4600}
4601
4602void addrconf_cleanup(void)
4603{
4604        struct inet6_ifaddr *ifa;
4605        struct net_device *dev;
4606        int i;
4607
4608        unregister_netdevice_notifier(&ipv6_dev_notf);
4609        unregister_pernet_subsys(&addrconf_ops);
4610
4611        rtnl_lock();
4612
4613        /* clean dev list */
4614        for_each_netdev(&init_net, dev) {
4615                if (__in6_dev_get(dev) == NULL)
4616                        continue;
4617                addrconf_ifdown(dev, 1);
4618        }
4619        addrconf_ifdown(init_net.loopback_dev, 2);
4620
4621        /*
4622         *      Check hash table.
4623         */
4624        write_lock_bh(&addrconf_hash_lock);
4625        for (i=0; i < IN6_ADDR_HSIZE; i++) {
4626                for (ifa=inet6_addr_lst[i]; ifa; ) {
4627                        struct inet6_ifaddr *bifa;
4628
4629                        bifa = ifa;
4630                        ifa = ifa->lst_next;
4631                        printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4632                        /* Do not free it; something is wrong.
4633                           Now we can investigate it with debugger.
4634                         */
4635                }
4636        }
4637        write_unlock_bh(&addrconf_hash_lock);
4638
4639        del_timer(&addr_chk_timer);
4640        rtnl_unlock();
4641}
4642