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#define pr_fmt(fmt) "IPv6: " fmt
  42
  43#include <linux/errno.h>
  44#include <linux/types.h>
  45#include <linux/kernel.h>
  46#include <linux/socket.h>
  47#include <linux/sockios.h>
  48#include <linux/net.h>
  49#include <linux/in6.h>
  50#include <linux/netdevice.h>
  51#include <linux/if_addr.h>
  52#include <linux/if_arp.h>
  53#include <linux/if_arcnet.h>
  54#include <linux/if_infiniband.h>
  55#include <linux/route.h>
  56#include <linux/inetdevice.h>
  57#include <linux/init.h>
  58#include <linux/slab.h>
  59#ifdef CONFIG_SYSCTL
  60#include <linux/sysctl.h>
  61#endif
  62#include <linux/capability.h>
  63#include <linux/delay.h>
  64#include <linux/notifier.h>
  65#include <linux/string.h>
  66#include <linux/hash.h>
  67
  68#include <net/net_namespace.h>
  69#include <net/sock.h>
  70#include <net/snmp.h>
  71
  72#include <net/af_ieee802154.h>
  73#include <net/ipv6.h>
  74#include <net/protocol.h>
  75#include <net/ndisc.h>
  76#include <net/ip6_route.h>
  77#include <net/addrconf.h>
  78#include <net/tcp.h>
  79#include <net/ip.h>
  80#include <net/netlink.h>
  81#include <net/pkt_sched.h>
  82#include <linux/if_tunnel.h>
  83#include <linux/rtnetlink.h>
  84
  85#ifdef CONFIG_IPV6_PRIVACY
  86#include <linux/random.h>
  87#endif
  88
  89#include <linux/uaccess.h>
  90#include <asm/unaligned.h>
  91
  92#include <linux/proc_fs.h>
  93#include <linux/seq_file.h>
  94#include <linux/export.h>
  95
  96/* Set to 3 to get tracing... */
  97#define ACONF_DEBUG 2
  98
  99#if ACONF_DEBUG >= 3
 100#define ADBG(x) printk x
 101#else
 102#define ADBG(x)
 103#endif
 104
 105#define INFINITY_LIFE_TIME      0xFFFFFFFF
 106
 107static inline u32 cstamp_delta(unsigned long cstamp)
 108{
 109        return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 110}
 111
 112#define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
 113#define ADDRCONF_TIMER_FUZZ             (HZ / 4)
 114#define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
 115
 116#ifdef CONFIG_SYSCTL
 117static void addrconf_sysctl_register(struct inet6_dev *idev);
 118static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 119#else
 120static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 121{
 122}
 123
 124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 125{
 126}
 127#endif
 128
 129#ifdef CONFIG_IPV6_PRIVACY
 130static void __ipv6_regen_rndid(struct inet6_dev *idev);
 131static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 132static void ipv6_regen_rndid(unsigned long data);
 133#endif
 134
 135static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 136static int ipv6_count_addresses(struct inet6_dev *idev);
 137
 138/*
 139 *      Configured unicast address hash table
 140 */
 141static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 142static DEFINE_SPINLOCK(addrconf_hash_lock);
 143
 144static void addrconf_verify(unsigned long);
 145
 146static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 147static DEFINE_SPINLOCK(addrconf_verify_lock);
 148
 149static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 150static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 151
 152static void addrconf_type_change(struct net_device *dev,
 153                                 unsigned long event);
 154static int addrconf_ifdown(struct net_device *dev, int how);
 155
 156static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 157static void addrconf_dad_timer(unsigned long data);
 158static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 159static void addrconf_dad_run(struct inet6_dev *idev);
 160static void addrconf_rs_timer(unsigned long data);
 161static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 162static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 163
 164static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 165                                struct prefix_info *pinfo);
 166static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 167                               struct net_device *dev);
 168
 169static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 170
 171static struct ipv6_devconf ipv6_devconf __read_mostly = {
 172        .forwarding             = 0,
 173        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 174        .mtu6                   = IPV6_MIN_MTU,
 175        .accept_ra              = 1,
 176        .accept_redirects       = 1,
 177        .autoconf               = 1,
 178        .force_mld_version      = 0,
 179        .dad_transmits          = 1,
 180        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 181        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 182        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 183#ifdef CONFIG_IPV6_PRIVACY
 184        .use_tempaddr           = 0,
 185        .temp_valid_lft         = TEMP_VALID_LIFETIME,
 186        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 187        .regen_max_retry        = REGEN_MAX_RETRY,
 188        .max_desync_factor      = MAX_DESYNC_FACTOR,
 189#endif
 190        .max_addresses          = IPV6_MAX_ADDRESSES,
 191        .accept_ra_defrtr       = 1,
 192        .accept_ra_pinfo        = 1,
 193#ifdef CONFIG_IPV6_ROUTER_PREF
 194        .accept_ra_rtr_pref     = 1,
 195        .rtr_probe_interval     = 60 * HZ,
 196#ifdef CONFIG_IPV6_ROUTE_INFO
 197        .accept_ra_rt_info_max_plen = 0,
 198#endif
 199#endif
 200        .proxy_ndp              = 0,
 201        .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 202        .disable_ipv6           = 0,
 203        .accept_dad             = 1,
 204};
 205
 206static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 207        .forwarding             = 0,
 208        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 209        .mtu6                   = IPV6_MIN_MTU,
 210        .accept_ra              = 1,
 211        .accept_redirects       = 1,
 212        .autoconf               = 1,
 213        .dad_transmits          = 1,
 214        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 215        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 216        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 217#ifdef CONFIG_IPV6_PRIVACY
 218        .use_tempaddr           = 0,
 219        .temp_valid_lft         = TEMP_VALID_LIFETIME,
 220        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 221        .regen_max_retry        = REGEN_MAX_RETRY,
 222        .max_desync_factor      = MAX_DESYNC_FACTOR,
 223#endif
 224        .max_addresses          = IPV6_MAX_ADDRESSES,
 225        .accept_ra_defrtr       = 1,
 226        .accept_ra_pinfo        = 1,
 227#ifdef CONFIG_IPV6_ROUTER_PREF
 228        .accept_ra_rtr_pref     = 1,
 229        .rtr_probe_interval     = 60 * HZ,
 230#ifdef CONFIG_IPV6_ROUTE_INFO
 231        .accept_ra_rt_info_max_plen = 0,
 232#endif
 233#endif
 234        .proxy_ndp              = 0,
 235        .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 236        .disable_ipv6           = 0,
 237        .accept_dad             = 1,
 238};
 239
 240/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 241const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 242const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 243const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 244const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 245
 246/* Check if a valid qdisc is available */
 247static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 248{
 249        return !qdisc_tx_is_noop(dev);
 250}
 251
 252/* Check if a route is valid prefix route */
 253static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 254{
 255        return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
 256}
 257
 258static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 259{
 260        if (del_timer(&ifp->timer))
 261                __in6_ifa_put(ifp);
 262}
 263
 264enum addrconf_timer_t {
 265        AC_NONE,
 266        AC_DAD,
 267        AC_RS,
 268};
 269
 270static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 271                               enum addrconf_timer_t what,
 272                               unsigned long when)
 273{
 274        if (!del_timer(&ifp->timer))
 275                in6_ifa_hold(ifp);
 276
 277        switch (what) {
 278        case AC_DAD:
 279                ifp->timer.function = addrconf_dad_timer;
 280                break;
 281        case AC_RS:
 282                ifp->timer.function = addrconf_rs_timer;
 283                break;
 284        default:
 285                break;
 286        }
 287        ifp->timer.expires = jiffies + when;
 288        add_timer(&ifp->timer);
 289}
 290
 291static int snmp6_alloc_dev(struct inet6_dev *idev)
 292{
 293        if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 294                          sizeof(struct ipstats_mib),
 295                          __alignof__(struct ipstats_mib)) < 0)
 296                goto err_ip;
 297        idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 298                                        GFP_KERNEL);
 299        if (!idev->stats.icmpv6dev)
 300                goto err_icmp;
 301        idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 302                                           GFP_KERNEL);
 303        if (!idev->stats.icmpv6msgdev)
 304                goto err_icmpmsg;
 305
 306        return 0;
 307
 308err_icmpmsg:
 309        kfree(idev->stats.icmpv6dev);
 310err_icmp:
 311        snmp_mib_free((void __percpu **)idev->stats.ipv6);
 312err_ip:
 313        return -ENOMEM;
 314}
 315
 316static void snmp6_free_dev(struct inet6_dev *idev)
 317{
 318        kfree(idev->stats.icmpv6msgdev);
 319        kfree(idev->stats.icmpv6dev);
 320        snmp_mib_free((void __percpu **)idev->stats.ipv6);
 321}
 322
 323/* Nobody refers to this device, we may destroy it. */
 324
 325void in6_dev_finish_destroy(struct inet6_dev *idev)
 326{
 327        struct net_device *dev = idev->dev;
 328
 329        WARN_ON(!list_empty(&idev->addr_list));
 330        WARN_ON(idev->mc_list != NULL);
 331
 332#ifdef NET_REFCNT_DEBUG
 333        pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
 334#endif
 335        dev_put(dev);
 336        if (!idev->dead) {
 337                pr_warn("Freeing alive inet6 device %p\n", idev);
 338                return;
 339        }
 340        snmp6_free_dev(idev);
 341        kfree_rcu(idev, rcu);
 342}
 343EXPORT_SYMBOL(in6_dev_finish_destroy);
 344
 345static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 346{
 347        struct inet6_dev *ndev;
 348
 349        ASSERT_RTNL();
 350
 351        if (dev->mtu < IPV6_MIN_MTU)
 352                return NULL;
 353
 354        ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 355
 356        if (ndev == NULL)
 357                return NULL;
 358
 359        rwlock_init(&ndev->lock);
 360        ndev->dev = dev;
 361        INIT_LIST_HEAD(&ndev->addr_list);
 362
 363        memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 364        ndev->cnf.mtu6 = dev->mtu;
 365        ndev->cnf.sysctl = NULL;
 366        ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 367        if (ndev->nd_parms == NULL) {
 368                kfree(ndev);
 369                return NULL;
 370        }
 371        if (ndev->cnf.forwarding)
 372                dev_disable_lro(dev);
 373        /* We refer to the device */
 374        dev_hold(dev);
 375
 376        if (snmp6_alloc_dev(ndev) < 0) {
 377                ADBG((KERN_WARNING
 378                        "%s: cannot allocate memory for statistics; dev=%s.\n",
 379                        __func__, dev->name));
 380                neigh_parms_release(&nd_tbl, ndev->nd_parms);
 381                dev_put(dev);
 382                kfree(ndev);
 383                return NULL;
 384        }
 385
 386        if (snmp6_register_dev(ndev) < 0) {
 387                ADBG((KERN_WARNING
 388                        "%s: cannot create /proc/net/dev_snmp6/%s\n",
 389                        __func__, dev->name));
 390                neigh_parms_release(&nd_tbl, ndev->nd_parms);
 391                ndev->dead = 1;
 392                in6_dev_finish_destroy(ndev);
 393                return NULL;
 394        }
 395
 396        /* One reference from device.  We must do this before
 397         * we invoke __ipv6_regen_rndid().
 398         */
 399        in6_dev_hold(ndev);
 400
 401        if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 402                ndev->cnf.accept_dad = -1;
 403
 404#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 405        if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 406                pr_info("%s: Disabled Multicast RS\n", dev->name);
 407                ndev->cnf.rtr_solicits = 0;
 408        }
 409#endif
 410
 411#ifdef CONFIG_IPV6_PRIVACY
 412        INIT_LIST_HEAD(&ndev->tempaddr_list);
 413        setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 414        if ((dev->flags&IFF_LOOPBACK) ||
 415            dev->type == ARPHRD_TUNNEL ||
 416            dev->type == ARPHRD_TUNNEL6 ||
 417            dev->type == ARPHRD_SIT ||
 418            dev->type == ARPHRD_NONE) {
 419                ndev->cnf.use_tempaddr = -1;
 420        } else {
 421                in6_dev_hold(ndev);
 422                ipv6_regen_rndid((unsigned long) ndev);
 423        }
 424#endif
 425
 426        if (netif_running(dev) && addrconf_qdisc_ok(dev))
 427                ndev->if_flags |= IF_READY;
 428
 429        ipv6_mc_init_dev(ndev);
 430        ndev->tstamp = jiffies;
 431        addrconf_sysctl_register(ndev);
 432        /* protected by rtnl_lock */
 433        rcu_assign_pointer(dev->ip6_ptr, ndev);
 434
 435        /* Join all-node multicast group */
 436        ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 437
 438        /* Join all-router multicast group if forwarding is set */
 439        if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 440                ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 441
 442        return ndev;
 443}
 444
 445static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 446{
 447        struct inet6_dev *idev;
 448
 449        ASSERT_RTNL();
 450
 451        idev = __in6_dev_get(dev);
 452        if (!idev) {
 453                idev = ipv6_add_dev(dev);
 454                if (!idev)
 455                        return NULL;
 456        }
 457
 458        if (dev->flags&IFF_UP)
 459                ipv6_mc_up(idev);
 460        return idev;
 461}
 462
 463#ifdef CONFIG_SYSCTL
 464static void dev_forward_change(struct inet6_dev *idev)
 465{
 466        struct net_device *dev;
 467        struct inet6_ifaddr *ifa;
 468
 469        if (!idev)
 470                return;
 471        dev = idev->dev;
 472        if (idev->cnf.forwarding)
 473                dev_disable_lro(dev);
 474        if (dev && (dev->flags & IFF_MULTICAST)) {
 475                if (idev->cnf.forwarding)
 476                        ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 477                else
 478                        ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 479        }
 480
 481        list_for_each_entry(ifa, &idev->addr_list, if_list) {
 482                if (ifa->flags&IFA_F_TENTATIVE)
 483                        continue;
 484                if (idev->cnf.forwarding)
 485                        addrconf_join_anycast(ifa);
 486                else
 487                        addrconf_leave_anycast(ifa);
 488        }
 489}
 490
 491
 492static void addrconf_forward_change(struct net *net, __s32 newf)
 493{
 494        struct net_device *dev;
 495        struct inet6_dev *idev;
 496
 497        for_each_netdev(net, dev) {
 498                idev = __in6_dev_get(dev);
 499                if (idev) {
 500                        int changed = (!idev->cnf.forwarding) ^ (!newf);
 501                        idev->cnf.forwarding = newf;
 502                        if (changed)
 503                                dev_forward_change(idev);
 504                }
 505        }
 506}
 507
 508static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 509{
 510        struct net *net;
 511        int old;
 512
 513        if (!rtnl_trylock())
 514                return restart_syscall();
 515
 516        net = (struct net *)table->extra2;
 517        old = *p;
 518        *p = newf;
 519
 520        if (p == &net->ipv6.devconf_dflt->forwarding) {
 521                rtnl_unlock();
 522                return 0;
 523        }
 524
 525        if (p == &net->ipv6.devconf_all->forwarding) {
 526                net->ipv6.devconf_dflt->forwarding = newf;
 527                addrconf_forward_change(net, newf);
 528        } else if ((!newf) ^ (!old))
 529                dev_forward_change((struct inet6_dev *)table->extra1);
 530        rtnl_unlock();
 531
 532        if (newf)
 533                rt6_purge_dflt_routers(net);
 534        return 1;
 535}
 536#endif
 537
 538/* Nobody refers to this ifaddr, destroy it */
 539void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 540{
 541        WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 542
 543#ifdef NET_REFCNT_DEBUG
 544        pr_debug("%s\n", __func__);
 545#endif
 546
 547        in6_dev_put(ifp->idev);
 548
 549        if (del_timer(&ifp->timer))
 550                pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 551
 552        if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 553                pr_warn("Freeing alive inet6 address %p\n", ifp);
 554                return;
 555        }
 556        dst_release(&ifp->rt->dst);
 557
 558        kfree_rcu(ifp, rcu);
 559}
 560
 561static void
 562ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 563{
 564        struct list_head *p;
 565        int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 566
 567        /*
 568         * Each device address list is sorted in order of scope -
 569         * global before linklocal.
 570         */
 571        list_for_each(p, &idev->addr_list) {
 572                struct inet6_ifaddr *ifa
 573                        = list_entry(p, struct inet6_ifaddr, if_list);
 574                if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 575                        break;
 576        }
 577
 578        list_add_tail(&ifp->if_list, p);
 579}
 580
 581static u32 inet6_addr_hash(const struct in6_addr *addr)
 582{
 583        return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 584}
 585
 586/* On success it returns ifp with increased reference count */
 587
 588static struct inet6_ifaddr *
 589ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 590              int scope, u32 flags)
 591{
 592        struct inet6_ifaddr *ifa = NULL;
 593        struct rt6_info *rt;
 594        unsigned int hash;
 595        int err = 0;
 596        int addr_type = ipv6_addr_type(addr);
 597
 598        if (addr_type == IPV6_ADDR_ANY ||
 599            addr_type & IPV6_ADDR_MULTICAST ||
 600            (!(idev->dev->flags & IFF_LOOPBACK) &&
 601             addr_type & IPV6_ADDR_LOOPBACK))
 602                return ERR_PTR(-EADDRNOTAVAIL);
 603
 604        rcu_read_lock_bh();
 605        if (idev->dead) {
 606                err = -ENODEV;                  /*XXX*/
 607                goto out2;
 608        }
 609
 610        if (idev->cnf.disable_ipv6) {
 611                err = -EACCES;
 612                goto out2;
 613        }
 614
 615        spin_lock(&addrconf_hash_lock);
 616
 617        /* Ignore adding duplicate addresses on an interface */
 618        if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 619                ADBG(("ipv6_add_addr: already assigned\n"));
 620                err = -EEXIST;
 621                goto out;
 622        }
 623
 624        ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 625
 626        if (ifa == NULL) {
 627                ADBG(("ipv6_add_addr: malloc failed\n"));
 628                err = -ENOBUFS;
 629                goto out;
 630        }
 631
 632        rt = addrconf_dst_alloc(idev, addr, false);
 633        if (IS_ERR(rt)) {
 634                err = PTR_ERR(rt);
 635                goto out;
 636        }
 637
 638        ifa->addr = *addr;
 639
 640        spin_lock_init(&ifa->lock);
 641        spin_lock_init(&ifa->state_lock);
 642        init_timer(&ifa->timer);
 643        INIT_HLIST_NODE(&ifa->addr_lst);
 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        ifa->idev = idev;
 653        in6_dev_hold(idev);
 654        /* For caller */
 655        in6_ifa_hold(ifa);
 656
 657        /* Add to big hash table */
 658        hash = inet6_addr_hash(addr);
 659
 660        hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 661        spin_unlock(&addrconf_hash_lock);
 662
 663        write_lock(&idev->lock);
 664        /* Add to inet6_dev unicast addr list. */
 665        ipv6_link_dev_addr(idev, ifa);
 666
 667#ifdef CONFIG_IPV6_PRIVACY
 668        if (ifa->flags&IFA_F_TEMPORARY) {
 669                list_add(&ifa->tmp_list, &idev->tempaddr_list);
 670                in6_ifa_hold(ifa);
 671        }
 672#endif
 673
 674        in6_ifa_hold(ifa);
 675        write_unlock(&idev->lock);
 676out2:
 677        rcu_read_unlock_bh();
 678
 679        if (likely(err == 0))
 680                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 681        else {
 682                kfree(ifa);
 683                ifa = ERR_PTR(err);
 684        }
 685
 686        return ifa;
 687out:
 688        spin_unlock(&addrconf_hash_lock);
 689        goto out2;
 690}
 691
 692/* This function wants to get referenced ifp and releases it before return */
 693
 694static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 695{
 696        struct inet6_ifaddr *ifa, *ifn;
 697        struct inet6_dev *idev = ifp->idev;
 698        int state;
 699        int deleted = 0, onlink = 0;
 700        unsigned long expires = jiffies;
 701
 702        spin_lock_bh(&ifp->state_lock);
 703        state = ifp->state;
 704        ifp->state = INET6_IFADDR_STATE_DEAD;
 705        spin_unlock_bh(&ifp->state_lock);
 706
 707        if (state == INET6_IFADDR_STATE_DEAD)
 708                goto out;
 709
 710        spin_lock_bh(&addrconf_hash_lock);
 711        hlist_del_init_rcu(&ifp->addr_lst);
 712        spin_unlock_bh(&addrconf_hash_lock);
 713
 714        write_lock_bh(&idev->lock);
 715#ifdef CONFIG_IPV6_PRIVACY
 716        if (ifp->flags&IFA_F_TEMPORARY) {
 717                list_del(&ifp->tmp_list);
 718                if (ifp->ifpub) {
 719                        in6_ifa_put(ifp->ifpub);
 720                        ifp->ifpub = NULL;
 721                }
 722                __in6_ifa_put(ifp);
 723        }
 724#endif
 725
 726        list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 727                if (ifa == ifp) {
 728                        list_del_init(&ifp->if_list);
 729                        __in6_ifa_put(ifp);
 730
 731                        if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 732                                break;
 733                        deleted = 1;
 734                        continue;
 735                } else if (ifp->flags & IFA_F_PERMANENT) {
 736                        if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 737                                              ifp->prefix_len)) {
 738                                if (ifa->flags & IFA_F_PERMANENT) {
 739                                        onlink = 1;
 740                                        if (deleted)
 741                                                break;
 742                                } else {
 743                                        unsigned long lifetime;
 744
 745                                        if (!onlink)
 746                                                onlink = -1;
 747
 748                                        spin_lock(&ifa->lock);
 749
 750                                        lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 751                                        /*
 752                                         * Note: Because this address is
 753                                         * not permanent, lifetime <
 754                                         * LONG_MAX / HZ here.
 755                                         */
 756                                        if (time_before(expires,
 757                                                        ifa->tstamp + lifetime * HZ))
 758                                                expires = ifa->tstamp + lifetime * HZ;
 759                                        spin_unlock(&ifa->lock);
 760                                }
 761                        }
 762                }
 763        }
 764        write_unlock_bh(&idev->lock);
 765
 766        addrconf_del_timer(ifp);
 767
 768        ipv6_ifa_notify(RTM_DELADDR, ifp);
 769
 770        atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 771
 772        /*
 773         * Purge or update corresponding prefix
 774         *
 775         * 1) we don't purge prefix here if address was not permanent.
 776         *    prefix is managed by its own lifetime.
 777         * 2) if there're no addresses, delete prefix.
 778         * 3) if there're still other permanent address(es),
 779         *    corresponding prefix is still permanent.
 780         * 4) otherwise, update prefix lifetime to the
 781         *    longest valid lifetime among the corresponding
 782         *    addresses on the device.
 783         *    Note: subsequent RA will update lifetime.
 784         *
 785         * --yoshfuji
 786         */
 787        if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 788                struct in6_addr prefix;
 789                struct rt6_info *rt;
 790                struct net *net = dev_net(ifp->idev->dev);
 791                struct flowi6 fl6 = {};
 792
 793                ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 794                fl6.flowi6_oif = ifp->idev->dev->ifindex;
 795                fl6.daddr = prefix;
 796                rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
 797                                                         RT6_LOOKUP_F_IFACE);
 798
 799                if (rt != net->ipv6.ip6_null_entry &&
 800                    addrconf_is_prefix_route(rt)) {
 801                        if (onlink == 0) {
 802                                ip6_del_rt(rt);
 803                                rt = NULL;
 804                        } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 805                                rt6_set_expires(rt, expires);
 806                        }
 807                }
 808                dst_release(&rt->dst);
 809        }
 810
 811        /* clean up prefsrc entries */
 812        rt6_remove_prefsrc(ifp);
 813out:
 814        in6_ifa_put(ifp);
 815}
 816
 817#ifdef CONFIG_IPV6_PRIVACY
 818static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 819{
 820        struct inet6_dev *idev = ifp->idev;
 821        struct in6_addr addr, *tmpaddr;
 822        unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
 823        unsigned long regen_advance;
 824        int tmp_plen;
 825        int ret = 0;
 826        int max_addresses;
 827        u32 addr_flags;
 828        unsigned long now = jiffies;
 829
 830        write_lock(&idev->lock);
 831        if (ift) {
 832                spin_lock_bh(&ift->lock);
 833                memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 834                spin_unlock_bh(&ift->lock);
 835                tmpaddr = &addr;
 836        } else {
 837                tmpaddr = NULL;
 838        }
 839retry:
 840        in6_dev_hold(idev);
 841        if (idev->cnf.use_tempaddr <= 0) {
 842                write_unlock(&idev->lock);
 843                pr_info("%s: use_tempaddr is disabled\n", __func__);
 844                in6_dev_put(idev);
 845                ret = -1;
 846                goto out;
 847        }
 848        spin_lock_bh(&ifp->lock);
 849        if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 850                idev->cnf.use_tempaddr = -1;    /*XXX*/
 851                spin_unlock_bh(&ifp->lock);
 852                write_unlock(&idev->lock);
 853                pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
 854                        __func__);
 855                in6_dev_put(idev);
 856                ret = -1;
 857                goto out;
 858        }
 859        in6_ifa_hold(ifp);
 860        memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 861        __ipv6_try_regen_rndid(idev, tmpaddr);
 862        memcpy(&addr.s6_addr[8], idev->rndid, 8);
 863        age = (now - ifp->tstamp) / HZ;
 864        tmp_valid_lft = min_t(__u32,
 865                              ifp->valid_lft,
 866                              idev->cnf.temp_valid_lft + age);
 867        tmp_prefered_lft = min_t(__u32,
 868                                 ifp->prefered_lft,
 869                                 idev->cnf.temp_prefered_lft + age -
 870                                 idev->cnf.max_desync_factor);
 871        tmp_plen = ifp->prefix_len;
 872        max_addresses = idev->cnf.max_addresses;
 873        tmp_tstamp = ifp->tstamp;
 874        spin_unlock_bh(&ifp->lock);
 875
 876        regen_advance = idev->cnf.regen_max_retry *
 877                        idev->cnf.dad_transmits *
 878                        idev->nd_parms->retrans_time / HZ;
 879        write_unlock(&idev->lock);
 880
 881        /* A temporary address is created only if this calculated Preferred
 882         * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 883         * an implementation must not create a temporary address with a zero
 884         * Preferred Lifetime.
 885         */
 886        if (tmp_prefered_lft <= regen_advance) {
 887                in6_ifa_put(ifp);
 888                in6_dev_put(idev);
 889                ret = -1;
 890                goto out;
 891        }
 892
 893        addr_flags = IFA_F_TEMPORARY;
 894        /* set in addrconf_prefix_rcv() */
 895        if (ifp->flags & IFA_F_OPTIMISTIC)
 896                addr_flags |= IFA_F_OPTIMISTIC;
 897
 898        ift = !max_addresses ||
 899              ipv6_count_addresses(idev) < max_addresses ?
 900                ipv6_add_addr(idev, &addr, tmp_plen,
 901                              ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 902                              addr_flags) : NULL;
 903        if (!ift || IS_ERR(ift)) {
 904                in6_ifa_put(ifp);
 905                in6_dev_put(idev);
 906                pr_info("%s: retry temporary address regeneration\n", __func__);
 907                tmpaddr = &addr;
 908                write_lock(&idev->lock);
 909                goto retry;
 910        }
 911
 912        spin_lock_bh(&ift->lock);
 913        ift->ifpub = ifp;
 914        ift->valid_lft = tmp_valid_lft;
 915        ift->prefered_lft = tmp_prefered_lft;
 916        ift->cstamp = now;
 917        ift->tstamp = tmp_tstamp;
 918        spin_unlock_bh(&ift->lock);
 919
 920        addrconf_dad_start(ift);
 921        in6_ifa_put(ift);
 922        in6_dev_put(idev);
 923out:
 924        return ret;
 925}
 926#endif
 927
 928/*
 929 *      Choose an appropriate source address (RFC3484)
 930 */
 931enum {
 932        IPV6_SADDR_RULE_INIT = 0,
 933        IPV6_SADDR_RULE_LOCAL,
 934        IPV6_SADDR_RULE_SCOPE,
 935        IPV6_SADDR_RULE_PREFERRED,
 936#ifdef CONFIG_IPV6_MIP6
 937        IPV6_SADDR_RULE_HOA,
 938#endif
 939        IPV6_SADDR_RULE_OIF,
 940        IPV6_SADDR_RULE_LABEL,
 941#ifdef CONFIG_IPV6_PRIVACY
 942        IPV6_SADDR_RULE_PRIVACY,
 943#endif
 944        IPV6_SADDR_RULE_ORCHID,
 945        IPV6_SADDR_RULE_PREFIX,
 946        IPV6_SADDR_RULE_MAX
 947};
 948
 949struct ipv6_saddr_score {
 950        int                     rule;
 951        int                     addr_type;
 952        struct inet6_ifaddr     *ifa;
 953        DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 954        int                     scopedist;
 955        int                     matchlen;
 956};
 957
 958struct ipv6_saddr_dst {
 959        const struct in6_addr *addr;
 960        int ifindex;
 961        int scope;
 962        int label;
 963        unsigned int prefs;
 964};
 965
 966static inline int ipv6_saddr_preferred(int type)
 967{
 968        if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
 969                return 1;
 970        return 0;
 971}
 972
 973static int ipv6_get_saddr_eval(struct net *net,
 974                               struct ipv6_saddr_score *score,
 975                               struct ipv6_saddr_dst *dst,
 976                               int i)
 977{
 978        int ret;
 979
 980        if (i <= score->rule) {
 981                switch (i) {
 982                case IPV6_SADDR_RULE_SCOPE:
 983                        ret = score->scopedist;
 984                        break;
 985                case IPV6_SADDR_RULE_PREFIX:
 986                        ret = score->matchlen;
 987                        break;
 988                default:
 989                        ret = !!test_bit(i, score->scorebits);
 990                }
 991                goto out;
 992        }
 993
 994        switch (i) {
 995        case IPV6_SADDR_RULE_INIT:
 996                /* Rule 0: remember if hiscore is not ready yet */
 997                ret = !!score->ifa;
 998                break;
 999        case IPV6_SADDR_RULE_LOCAL:
1000                /* Rule 1: Prefer same address */
1001                ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1002                break;
1003        case IPV6_SADDR_RULE_SCOPE:
1004                /* Rule 2: Prefer appropriate scope
1005                 *
1006                 *      ret
1007                 *       ^
1008                 *    -1 |  d 15
1009                 *    ---+--+-+---> scope
1010                 *       |
1011                 *       |             d is scope of the destination.
1012                 *  B-d  |  \
1013                 *       |   \      <- smaller scope is better if
1014                 *  B-15 |    \        if scope is enough for destinaion.
1015                 *       |             ret = B - scope (-1 <= scope >= d <= 15).
1016                 * d-C-1 | /
1017                 *       |/         <- greater is better
1018                 *   -C  /             if scope is not enough for destination.
1019                 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1020                 *
1021                 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1022                 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1023                 * Assume B = 0 and we get C > 29.
1024                 */
1025                ret = __ipv6_addr_src_scope(score->addr_type);
1026                if (ret >= dst->scope)
1027                        ret = -ret;
1028                else
1029                        ret -= 128;     /* 30 is enough */
1030                score->scopedist = ret;
1031                break;
1032        case IPV6_SADDR_RULE_PREFERRED:
1033                /* Rule 3: Avoid deprecated and optimistic addresses */
1034                ret = ipv6_saddr_preferred(score->addr_type) ||
1035                      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1036                break;
1037#ifdef CONFIG_IPV6_MIP6
1038        case IPV6_SADDR_RULE_HOA:
1039            {
1040                /* Rule 4: Prefer home address */
1041                int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1042                ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1043                break;
1044            }
1045#endif
1046        case IPV6_SADDR_RULE_OIF:
1047                /* Rule 5: Prefer outgoing interface */
1048                ret = (!dst->ifindex ||
1049                       dst->ifindex == score->ifa->idev->dev->ifindex);
1050                break;
1051        case IPV6_SADDR_RULE_LABEL:
1052                /* Rule 6: Prefer matching label */
1053                ret = ipv6_addr_label(net,
1054                                      &score->ifa->addr, score->addr_type,
1055                                      score->ifa->idev->dev->ifindex) == dst->label;
1056                break;
1057#ifdef CONFIG_IPV6_PRIVACY
1058        case IPV6_SADDR_RULE_PRIVACY:
1059            {
1060                /* Rule 7: Prefer public address
1061                 * Note: prefer temporary address if use_tempaddr >= 2
1062                 */
1063                int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1064                                !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1065                                score->ifa->idev->cnf.use_tempaddr >= 2;
1066                ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1067                break;
1068            }
1069#endif
1070        case IPV6_SADDR_RULE_ORCHID:
1071                /* Rule 8-: Prefer ORCHID vs ORCHID or
1072                 *          non-ORCHID vs non-ORCHID
1073                 */
1074                ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1075                        ipv6_addr_orchid(dst->addr));
1076                break;
1077        case IPV6_SADDR_RULE_PREFIX:
1078                /* Rule 8: Use longest matching prefix */
1079                ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1080                if (ret > score->ifa->prefix_len)
1081                        ret = score->ifa->prefix_len;
1082                score->matchlen = ret;
1083                break;
1084        default:
1085                ret = 0;
1086        }
1087
1088        if (ret)
1089                __set_bit(i, score->scorebits);
1090        score->rule = i;
1091out:
1092        return ret;
1093}
1094
1095int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1096                       const struct in6_addr *daddr, unsigned int prefs,
1097                       struct in6_addr *saddr)
1098{
1099        struct ipv6_saddr_score scores[2],
1100                                *score = &scores[0], *hiscore = &scores[1];
1101        struct ipv6_saddr_dst dst;
1102        struct net_device *dev;
1103        int dst_type;
1104
1105        dst_type = __ipv6_addr_type(daddr);
1106        dst.addr = daddr;
1107        dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1108        dst.scope = __ipv6_addr_src_scope(dst_type);
1109        dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1110        dst.prefs = prefs;
1111
1112        hiscore->rule = -1;
1113        hiscore->ifa = NULL;
1114
1115        rcu_read_lock();
1116
1117        for_each_netdev_rcu(net, dev) {
1118                struct inet6_dev *idev;
1119
1120                /* Candidate Source Address (section 4)
1121                 *  - multicast and link-local destination address,
1122                 *    the set of candidate source address MUST only
1123                 *    include addresses assigned to interfaces
1124                 *    belonging to the same link as the outgoing
1125                 *    interface.
1126                 * (- For site-local destination addresses, the
1127                 *    set of candidate source addresses MUST only
1128                 *    include addresses assigned to interfaces
1129                 *    belonging to the same site as the outgoing
1130                 *    interface.)
1131                 */
1132                if (((dst_type & IPV6_ADDR_MULTICAST) ||
1133                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1134                    dst.ifindex && dev->ifindex != dst.ifindex)
1135                        continue;
1136
1137                idev = __in6_dev_get(dev);
1138                if (!idev)
1139                        continue;
1140
1141                read_lock_bh(&idev->lock);
1142                list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1143                        int i;
1144
1145                        /*
1146                         * - Tentative Address (RFC2462 section 5.4)
1147                         *  - A tentative address is not considered
1148                         *    "assigned to an interface" in the traditional
1149                         *    sense, unless it is also flagged as optimistic.
1150                         * - Candidate Source Address (section 4)
1151                         *  - In any case, anycast addresses, multicast
1152                         *    addresses, and the unspecified address MUST
1153                         *    NOT be included in a candidate set.
1154                         */
1155                        if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1156                            (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1157                                continue;
1158
1159                        score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1160
1161                        if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1162                                     score->addr_type & IPV6_ADDR_MULTICAST)) {
1163                                LIMIT_NETDEBUG(KERN_DEBUG
1164                                               "ADDRCONF: unspecified / multicast address "
1165                                               "assigned as unicast address on %s",
1166                                               dev->name);
1167                                continue;
1168                        }
1169
1170                        score->rule = -1;
1171                        bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1172
1173                        for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1174                                int minihiscore, miniscore;
1175
1176                                minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1177                                miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1178
1179                                if (minihiscore > miniscore) {
1180                                        if (i == IPV6_SADDR_RULE_SCOPE &&
1181                                            score->scopedist > 0) {
1182                                                /*
1183                                                 * special case:
1184                                                 * each remaining entry
1185                                                 * has too small (not enough)
1186                                                 * scope, because ifa entries
1187                                                 * are sorted by their scope
1188                                                 * values.
1189                                                 */
1190                                                goto try_nextdev;
1191                                        }
1192                                        break;
1193                                } else if (minihiscore < miniscore) {
1194                                        if (hiscore->ifa)
1195                                                in6_ifa_put(hiscore->ifa);
1196
1197                                        in6_ifa_hold(score->ifa);
1198
1199                                        swap(hiscore, score);
1200
1201                                        /* restore our iterator */
1202                                        score->ifa = hiscore->ifa;
1203
1204                                        break;
1205                                }
1206                        }
1207                }
1208try_nextdev:
1209                read_unlock_bh(&idev->lock);
1210        }
1211        rcu_read_unlock();
1212
1213        if (!hiscore->ifa)
1214                return -EADDRNOTAVAIL;
1215
1216        *saddr = hiscore->ifa->addr;
1217        in6_ifa_put(hiscore->ifa);
1218        return 0;
1219}
1220EXPORT_SYMBOL(ipv6_dev_get_saddr);
1221
1222int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1223                    unsigned char banned_flags)
1224{
1225        struct inet6_dev *idev;
1226        int err = -EADDRNOTAVAIL;
1227
1228        rcu_read_lock();
1229        idev = __in6_dev_get(dev);
1230        if (idev) {
1231                struct inet6_ifaddr *ifp;
1232
1233                read_lock_bh(&idev->lock);
1234                list_for_each_entry(ifp, &idev->addr_list, if_list) {
1235                        if (ifp->scope == IFA_LINK &&
1236                            !(ifp->flags & banned_flags)) {
1237                                *addr = ifp->addr;
1238                                err = 0;
1239                                break;
1240                        }
1241                }
1242                read_unlock_bh(&idev->lock);
1243        }
1244        rcu_read_unlock();
1245        return err;
1246}
1247
1248static int ipv6_count_addresses(struct inet6_dev *idev)
1249{
1250        int cnt = 0;
1251        struct inet6_ifaddr *ifp;
1252
1253        read_lock_bh(&idev->lock);
1254        list_for_each_entry(ifp, &idev->addr_list, if_list)
1255                cnt++;
1256        read_unlock_bh(&idev->lock);
1257        return cnt;
1258}
1259
1260int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1261                  struct net_device *dev, int strict)
1262{
1263        struct inet6_ifaddr *ifp;
1264        struct hlist_node *node;
1265        unsigned int hash = inet6_addr_hash(addr);
1266
1267        rcu_read_lock_bh();
1268        hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1269                if (!net_eq(dev_net(ifp->idev->dev), net))
1270                        continue;
1271                if (ipv6_addr_equal(&ifp->addr, addr) &&
1272                    !(ifp->flags&IFA_F_TENTATIVE) &&
1273                    (dev == NULL || ifp->idev->dev == dev ||
1274                     !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1275                        rcu_read_unlock_bh();
1276                        return 1;
1277                }
1278        }
1279
1280        rcu_read_unlock_bh();
1281        return 0;
1282}
1283EXPORT_SYMBOL(ipv6_chk_addr);
1284
1285static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1286                               struct net_device *dev)
1287{
1288        unsigned int hash = inet6_addr_hash(addr);
1289        struct inet6_ifaddr *ifp;
1290        struct hlist_node *node;
1291
1292        hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1293                if (!net_eq(dev_net(ifp->idev->dev), net))
1294                        continue;
1295                if (ipv6_addr_equal(&ifp->addr, addr)) {
1296                        if (dev == NULL || ifp->idev->dev == dev)
1297                                return true;
1298                }
1299        }
1300        return false;
1301}
1302
1303int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1304{
1305        struct inet6_dev *idev;
1306        struct inet6_ifaddr *ifa;
1307        int     onlink;
1308
1309        onlink = 0;
1310        rcu_read_lock();
1311        idev = __in6_dev_get(dev);
1312        if (idev) {
1313                read_lock_bh(&idev->lock);
1314                list_for_each_entry(ifa, &idev->addr_list, if_list) {
1315                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
1316                                                   ifa->prefix_len);
1317                        if (onlink)
1318                                break;
1319                }
1320                read_unlock_bh(&idev->lock);
1321        }
1322        rcu_read_unlock();
1323        return onlink;
1324}
1325EXPORT_SYMBOL(ipv6_chk_prefix);
1326
1327struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1328                                     struct net_device *dev, int strict)
1329{
1330        struct inet6_ifaddr *ifp, *result = NULL;
1331        unsigned int hash = inet6_addr_hash(addr);
1332        struct hlist_node *node;
1333
1334        rcu_read_lock_bh();
1335        hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1336                if (!net_eq(dev_net(ifp->idev->dev), net))
1337                        continue;
1338                if (ipv6_addr_equal(&ifp->addr, addr)) {
1339                        if (dev == NULL || ifp->idev->dev == dev ||
1340                            !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1341                                result = ifp;
1342                                in6_ifa_hold(ifp);
1343                                break;
1344                        }
1345                }
1346        }
1347        rcu_read_unlock_bh();
1348
1349        return result;
1350}
1351
1352/* Gets referenced address, destroys ifaddr */
1353
1354static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1355{
1356        if (ifp->flags&IFA_F_PERMANENT) {
1357                spin_lock_bh(&ifp->lock);
1358                addrconf_del_timer(ifp);
1359                ifp->flags |= IFA_F_TENTATIVE;
1360                if (dad_failed)
1361                        ifp->flags |= IFA_F_DADFAILED;
1362                spin_unlock_bh(&ifp->lock);
1363                if (dad_failed)
1364                        ipv6_ifa_notify(0, ifp);
1365                in6_ifa_put(ifp);
1366#ifdef CONFIG_IPV6_PRIVACY
1367        } else if (ifp->flags&IFA_F_TEMPORARY) {
1368                struct inet6_ifaddr *ifpub;
1369                spin_lock_bh(&ifp->lock);
1370                ifpub = ifp->ifpub;
1371                if (ifpub) {
1372                        in6_ifa_hold(ifpub);
1373                        spin_unlock_bh(&ifp->lock);
1374                        ipv6_create_tempaddr(ifpub, ifp);
1375                        in6_ifa_put(ifpub);
1376                } else {
1377                        spin_unlock_bh(&ifp->lock);
1378                }
1379                ipv6_del_addr(ifp);
1380#endif
1381        } else
1382                ipv6_del_addr(ifp);
1383}
1384
1385static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1386{
1387        int err = -ENOENT;
1388
1389        spin_lock(&ifp->state_lock);
1390        if (ifp->state == INET6_IFADDR_STATE_DAD) {
1391                ifp->state = INET6_IFADDR_STATE_POSTDAD;
1392                err = 0;
1393        }
1394        spin_unlock(&ifp->state_lock);
1395
1396        return err;
1397}
1398
1399void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1400{
1401        struct inet6_dev *idev = ifp->idev;
1402
1403        if (addrconf_dad_end(ifp)) {
1404                in6_ifa_put(ifp);
1405                return;
1406        }
1407
1408        net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1409                             ifp->idev->dev->name, &ifp->addr);
1410
1411        if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1412                struct in6_addr addr;
1413
1414                addr.s6_addr32[0] = htonl(0xfe800000);
1415                addr.s6_addr32[1] = 0;
1416
1417                if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1418                    ipv6_addr_equal(&ifp->addr, &addr)) {
1419                        /* DAD failed for link-local based on MAC address */
1420                        idev->cnf.disable_ipv6 = 1;
1421
1422                        pr_info("%s: IPv6 being disabled!\n",
1423                                ifp->idev->dev->name);
1424                }
1425        }
1426
1427        addrconf_dad_stop(ifp, 1);
1428}
1429
1430/* Join to solicited addr multicast group. */
1431
1432void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1433{
1434        struct in6_addr maddr;
1435
1436        if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1437                return;
1438
1439        addrconf_addr_solict_mult(addr, &maddr);
1440        ipv6_dev_mc_inc(dev, &maddr);
1441}
1442
1443void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1444{
1445        struct in6_addr maddr;
1446
1447        if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1448                return;
1449
1450        addrconf_addr_solict_mult(addr, &maddr);
1451        __ipv6_dev_mc_dec(idev, &maddr);
1452}
1453
1454static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1455{
1456        struct in6_addr addr;
1457        if (ifp->prefix_len == 127) /* RFC 6164 */
1458                return;
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        if (ifp->prefix_len == 127) /* RFC 6164 */
1469                return;
1470        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1471        if (ipv6_addr_any(&addr))
1472                return;
1473        __ipv6_dev_ac_dec(ifp->idev, &addr);
1474}
1475
1476static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1477{
1478        if (dev->addr_len != ETH_ALEN)
1479                return -1;
1480        memcpy(eui, dev->dev_addr, 3);
1481        memcpy(eui + 5, dev->dev_addr + 3, 3);
1482
1483        /*
1484         * The zSeries OSA network cards can be shared among various
1485         * OS instances, but the OSA cards have only one MAC address.
1486         * This leads to duplicate address conflicts in conjunction
1487         * with IPv6 if more than one instance uses the same card.
1488         *
1489         * The driver for these cards can deliver a unique 16-bit
1490         * identifier for each instance sharing the same card.  It is
1491         * placed instead of 0xFFFE in the interface identifier.  The
1492         * "u" bit of the interface identifier is not inverted in this
1493         * case.  Hence the resulting interface identifier has local
1494         * scope according to RFC2373.
1495         */
1496        if (dev->dev_id) {
1497                eui[3] = (dev->dev_id >> 8) & 0xFF;
1498                eui[4] = dev->dev_id & 0xFF;
1499        } else {
1500                eui[3] = 0xFF;
1501                eui[4] = 0xFE;
1502                eui[0] ^= 2;
1503        }
1504        return 0;
1505}
1506
1507static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1508{
1509        if (dev->addr_len != IEEE802154_ADDR_LEN)
1510                return -1;
1511        memcpy(eui, dev->dev_addr, 8);
1512        return 0;
1513}
1514
1515static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1516{
1517        /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1518        if (dev->addr_len != ARCNET_ALEN)
1519                return -1;
1520        memset(eui, 0, 7);
1521        eui[7] = *(u8 *)dev->dev_addr;
1522        return 0;
1523}
1524
1525static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1526{
1527        if (dev->addr_len != INFINIBAND_ALEN)
1528                return -1;
1529        memcpy(eui, dev->dev_addr + 12, 8);
1530        eui[0] |= 2;
1531        return 0;
1532}
1533
1534static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1535{
1536        if (addr == 0)
1537                return -1;
1538        eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1539                  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1540                  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1541                  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1542                  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1543                  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1544        eui[1] = 0;
1545        eui[2] = 0x5E;
1546        eui[3] = 0xFE;
1547        memcpy(eui + 4, &addr, 4);
1548        return 0;
1549}
1550
1551static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1552{
1553        if (dev->priv_flags & IFF_ISATAP)
1554                return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1555        return -1;
1556}
1557
1558static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1559{
1560        return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1561}
1562
1563static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1564{
1565        switch (dev->type) {
1566        case ARPHRD_ETHER:
1567        case ARPHRD_FDDI:
1568                return addrconf_ifid_eui48(eui, dev);
1569        case ARPHRD_ARCNET:
1570                return addrconf_ifid_arcnet(eui, dev);
1571        case ARPHRD_INFINIBAND:
1572                return addrconf_ifid_infiniband(eui, dev);
1573        case ARPHRD_SIT:
1574                return addrconf_ifid_sit(eui, dev);
1575        case ARPHRD_IPGRE:
1576                return addrconf_ifid_gre(eui, dev);
1577        case ARPHRD_IEEE802154:
1578                return addrconf_ifid_eui64(eui, dev);
1579        }
1580        return -1;
1581}
1582
1583static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1584{
1585        int err = -1;
1586        struct inet6_ifaddr *ifp;
1587
1588        read_lock_bh(&idev->lock);
1589        list_for_each_entry(ifp, &idev->addr_list, if_list) {
1590                if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1591                        memcpy(eui, ifp->addr.s6_addr+8, 8);
1592                        err = 0;
1593                        break;
1594                }
1595        }
1596        read_unlock_bh(&idev->lock);
1597        return err;
1598}
1599
1600#ifdef CONFIG_IPV6_PRIVACY
1601/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1602static void __ipv6_regen_rndid(struct inet6_dev *idev)
1603{
1604regen:
1605        get_random_bytes(idev->rndid, sizeof(idev->rndid));
1606        idev->rndid[0] &= ~0x02;
1607
1608        /*
1609         * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1610         * check if generated address is not inappropriate
1611         *
1612         *  - Reserved subnet anycast (RFC 2526)
1613         *      11111101 11....11 1xxxxxxx
1614         *  - ISATAP (RFC4214) 6.1
1615         *      00-00-5E-FE-xx-xx-xx-xx
1616         *  - value 0
1617         *  - XXX: already assigned to an address on the device
1618         */
1619        if (idev->rndid[0] == 0xfd &&
1620            (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1621            (idev->rndid[7]&0x80))
1622                goto regen;
1623        if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1624                if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1625                        goto regen;
1626                if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1627                        goto regen;
1628        }
1629}
1630
1631static void ipv6_regen_rndid(unsigned long data)
1632{
1633        struct inet6_dev *idev = (struct inet6_dev *) data;
1634        unsigned long expires;
1635
1636        rcu_read_lock_bh();
1637        write_lock_bh(&idev->lock);
1638
1639        if (idev->dead)
1640                goto out;
1641
1642        __ipv6_regen_rndid(idev);
1643
1644        expires = jiffies +
1645                idev->cnf.temp_prefered_lft * HZ -
1646                idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1647                idev->cnf.max_desync_factor * HZ;
1648        if (time_before(expires, jiffies)) {
1649                pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1650                        __func__, idev->dev->name);
1651                goto out;
1652        }
1653
1654        if (!mod_timer(&idev->regen_timer, expires))
1655                in6_dev_hold(idev);
1656
1657out:
1658        write_unlock_bh(&idev->lock);
1659        rcu_read_unlock_bh();
1660        in6_dev_put(idev);
1661}
1662
1663static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1664{
1665        if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1666                __ipv6_regen_rndid(idev);
1667}
1668#endif
1669
1670/*
1671 *      Add prefix route.
1672 */
1673
1674static void
1675addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1676                      unsigned long expires, u32 flags)
1677{
1678        struct fib6_config cfg = {
1679                .fc_table = RT6_TABLE_PREFIX,
1680                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1681                .fc_ifindex = dev->ifindex,
1682                .fc_expires = expires,
1683                .fc_dst_len = plen,
1684                .fc_flags = RTF_UP | flags,
1685                .fc_nlinfo.nl_net = dev_net(dev),
1686                .fc_protocol = RTPROT_KERNEL,
1687        };
1688
1689        cfg.fc_dst = *pfx;
1690
1691        /* Prevent useless cloning on PtP SIT.
1692           This thing is done here expecting that the whole
1693           class of non-broadcast devices need not cloning.
1694         */
1695#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1696        if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1697                cfg.fc_flags |= RTF_NONEXTHOP;
1698#endif
1699
1700        ip6_route_add(&cfg);
1701}
1702
1703
1704static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1705                                                  int plen,
1706                                                  const struct net_device *dev,
1707                                                  u32 flags, u32 noflags)
1708{
1709        struct fib6_node *fn;
1710        struct rt6_info *rt = NULL;
1711        struct fib6_table *table;
1712
1713        table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1714        if (table == NULL)
1715                return NULL;
1716
1717        read_lock_bh(&table->tb6_lock);
1718        fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1719        if (!fn)
1720                goto out;
1721        for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1722                if (rt->dst.dev->ifindex != dev->ifindex)
1723                        continue;
1724                if ((rt->rt6i_flags & flags) != flags)
1725                        continue;
1726                if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1727                        continue;
1728                dst_hold(&rt->dst);
1729                break;
1730        }
1731out:
1732        read_unlock_bh(&table->tb6_lock);
1733        return rt;
1734}
1735
1736
1737/* Create "default" multicast route to the interface */
1738
1739static void addrconf_add_mroute(struct net_device *dev)
1740{
1741        struct fib6_config cfg = {
1742                .fc_table = RT6_TABLE_LOCAL,
1743                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1744                .fc_ifindex = dev->ifindex,
1745                .fc_dst_len = 8,
1746                .fc_flags = RTF_UP,
1747                .fc_nlinfo.nl_net = dev_net(dev),
1748        };
1749
1750        ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1751
1752        ip6_route_add(&cfg);
1753}
1754
1755#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1756static void sit_route_add(struct net_device *dev)
1757{
1758        struct fib6_config cfg = {
1759                .fc_table = RT6_TABLE_MAIN,
1760                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1761                .fc_ifindex = dev->ifindex,
1762                .fc_dst_len = 96,
1763                .fc_flags = RTF_UP | RTF_NONEXTHOP,
1764                .fc_nlinfo.nl_net = dev_net(dev),
1765        };
1766
1767        /* prefix length - 96 bits "::d.d.d.d" */
1768        ip6_route_add(&cfg);
1769}
1770#endif
1771
1772static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1773{
1774        struct inet6_dev *idev;
1775
1776        ASSERT_RTNL();
1777
1778        idev = ipv6_find_idev(dev);
1779        if (!idev)
1780                return ERR_PTR(-ENOBUFS);
1781
1782        if (idev->cnf.disable_ipv6)
1783                return ERR_PTR(-EACCES);
1784
1785        /* Add default multicast route */
1786        if (!(dev->flags & IFF_LOOPBACK))
1787                addrconf_add_mroute(dev);
1788
1789        return idev;
1790}
1791
1792void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1793{
1794        struct prefix_info *pinfo;
1795        __u32 valid_lft;
1796        __u32 prefered_lft;
1797        int addr_type;
1798        struct inet6_dev *in6_dev;
1799        struct net *net = dev_net(dev);
1800
1801        pinfo = (struct prefix_info *) opt;
1802
1803        if (len < sizeof(struct prefix_info)) {
1804                ADBG(("addrconf: prefix option too short\n"));
1805                return;
1806        }
1807
1808        /*
1809         *      Validation checks ([ADDRCONF], page 19)
1810         */
1811
1812        addr_type = ipv6_addr_type(&pinfo->prefix);
1813
1814        if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1815                return;
1816
1817        valid_lft = ntohl(pinfo->valid);
1818        prefered_lft = ntohl(pinfo->prefered);
1819
1820        if (prefered_lft > valid_lft) {
1821                net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1822                return;
1823        }
1824
1825        in6_dev = in6_dev_get(dev);
1826
1827        if (in6_dev == NULL) {
1828                net_dbg_ratelimited("addrconf: device %s not configured\n",
1829                                    dev->name);
1830                return;
1831        }
1832
1833        /*
1834         *      Two things going on here:
1835         *      1) Add routes for on-link prefixes
1836         *      2) Configure prefixes with the auto flag set
1837         */
1838
1839        if (pinfo->onlink) {
1840                struct rt6_info *rt;
1841                unsigned long rt_expires;
1842
1843                /* Avoid arithmetic overflow. Really, we could
1844                 * save rt_expires in seconds, likely valid_lft,
1845                 * but it would require division in fib gc, that it
1846                 * not good.
1847                 */
1848                if (HZ > USER_HZ)
1849                        rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1850                else
1851                        rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1852
1853                if (addrconf_finite_timeout(rt_expires))
1854                        rt_expires *= HZ;
1855
1856                rt = addrconf_get_prefix_route(&pinfo->prefix,
1857                                               pinfo->prefix_len,
1858                                               dev,
1859                                               RTF_ADDRCONF | RTF_PREFIX_RT,
1860                                               RTF_GATEWAY | RTF_DEFAULT);
1861
1862                if (rt) {
1863                        /* Autoconf prefix route */
1864                        if (valid_lft == 0) {
1865                                ip6_del_rt(rt);
1866                                rt = NULL;
1867                        } else if (addrconf_finite_timeout(rt_expires)) {
1868                                /* not infinity */
1869                                rt6_set_expires(rt, jiffies + rt_expires);
1870                        } else {
1871                                rt6_clean_expires(rt);
1872                        }
1873                } else if (valid_lft) {
1874                        clock_t expires = 0;
1875                        int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1876                        if (addrconf_finite_timeout(rt_expires)) {
1877                                /* not infinity */
1878                                flags |= RTF_EXPIRES;
1879                                expires = jiffies_to_clock_t(rt_expires);
1880                        }
1881                        addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1882                                              dev, expires, flags);
1883                }
1884                if (rt)
1885                        dst_release(&rt->dst);
1886        }
1887
1888        /* Try to figure out our local address for this prefix */
1889
1890        if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1891                struct inet6_ifaddr *ifp;
1892                struct in6_addr addr;
1893                int create = 0, update_lft = 0;
1894
1895                if (pinfo->prefix_len == 64) {
1896                        memcpy(&addr, &pinfo->prefix, 8);
1897                        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1898                            ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1899                                in6_dev_put(in6_dev);
1900                                return;
1901                        }
1902                        goto ok;
1903                }
1904                net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1905                                    pinfo->prefix_len);
1906                in6_dev_put(in6_dev);
1907                return;
1908
1909ok:
1910
1911                ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1912
1913                if (ifp == NULL && valid_lft) {
1914                        int max_addresses = in6_dev->cnf.max_addresses;
1915                        u32 addr_flags = 0;
1916
1917#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1918                        if (in6_dev->cnf.optimistic_dad &&
1919                            !net->ipv6.devconf_all->forwarding && sllao)
1920                                addr_flags = IFA_F_OPTIMISTIC;
1921#endif
1922
1923                        /* Do not allow to create too much of autoconfigured
1924                         * addresses; this would be too easy way to crash kernel.
1925                         */
1926                        if (!max_addresses ||
1927                            ipv6_count_addresses(in6_dev) < max_addresses)
1928                                ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1929                                                    addr_type&IPV6_ADDR_SCOPE_MASK,
1930                                                    addr_flags);
1931
1932                        if (!ifp || IS_ERR(ifp)) {
1933                                in6_dev_put(in6_dev);
1934                                return;
1935                        }
1936
1937                        update_lft = create = 1;
1938                        ifp->cstamp = jiffies;
1939                        addrconf_dad_start(ifp);
1940                }
1941
1942                if (ifp) {
1943                        int flags;
1944                        unsigned long now;
1945#ifdef CONFIG_IPV6_PRIVACY
1946                        struct inet6_ifaddr *ift;
1947#endif
1948                        u32 stored_lft;
1949
1950                        /* update lifetime (RFC2462 5.5.3 e) */
1951                        spin_lock(&ifp->lock);
1952                        now = jiffies;
1953                        if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1954                                stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1955                        else
1956                                stored_lft = 0;
1957                        if (!update_lft && stored_lft) {
1958                                if (valid_lft > MIN_VALID_LIFETIME ||
1959                                    valid_lft > stored_lft)
1960                                        update_lft = 1;
1961                                else if (stored_lft <= MIN_VALID_LIFETIME) {
1962                                        /* valid_lft <= stored_lft is always true */
1963                                        /*
1964                                         * RFC 4862 Section 5.5.3e:
1965                                         * "Note that the preferred lifetime of
1966                                         *  the corresponding address is always
1967                                         *  reset to the Preferred Lifetime in
1968                                         *  the received Prefix Information
1969                                         *  option, regardless of whether the
1970                                         *  valid lifetime is also reset or
1971                                         *  ignored."
1972                                         *
1973                                         *  So if the preferred lifetime in
1974                                         *  this advertisement is different
1975                                         *  than what we have stored, but the
1976                                         *  valid lifetime is invalid, just
1977                                         *  reset prefered_lft.
1978                                         *
1979                                         *  We must set the valid lifetime
1980                                         *  to the stored lifetime since we'll
1981                                         *  be updating the timestamp below,
1982                                         *  else we'll set it back to the
1983                                         *  minimum.
1984                                         */
1985                                        if (prefered_lft != ifp->prefered_lft) {
1986                                                valid_lft = stored_lft;
1987                                                update_lft = 1;
1988                                        }
1989                                } else {
1990                                        valid_lft = MIN_VALID_LIFETIME;
1991                                        if (valid_lft < prefered_lft)
1992                                                prefered_lft = valid_lft;
1993                                        update_lft = 1;
1994                                }
1995                        }
1996
1997                        if (update_lft) {
1998                                ifp->valid_lft = valid_lft;
1999                                ifp->prefered_lft = prefered_lft;
2000                                ifp->tstamp = now;
2001                                flags = ifp->flags;
2002                                ifp->flags &= ~IFA_F_DEPRECATED;
2003                                spin_unlock(&ifp->lock);
2004
2005                                if (!(flags&IFA_F_TENTATIVE))
2006                                        ipv6_ifa_notify(0, ifp);
2007                        } else
2008                                spin_unlock(&ifp->lock);
2009
2010#ifdef CONFIG_IPV6_PRIVACY
2011                        read_lock_bh(&in6_dev->lock);
2012                        /* update all temporary addresses in the list */
2013                        list_for_each_entry(ift, &in6_dev->tempaddr_list,
2014                                            tmp_list) {
2015                                int age, max_valid, max_prefered;
2016
2017                                if (ifp != ift->ifpub)
2018                                        continue;
2019
2020                                /*
2021                                 * RFC 4941 section 3.3:
2022                                 * If a received option will extend the lifetime
2023                                 * of a public address, the lifetimes of
2024                                 * temporary addresses should be extended,
2025                                 * subject to the overall constraint that no
2026                                 * temporary addresses should ever remain
2027                                 * "valid" or "preferred" for a time longer than
2028                                 * (TEMP_VALID_LIFETIME) or
2029                                 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2030                                 * respectively.
2031                                 */
2032                                age = (now - ift->cstamp) / HZ;
2033                                max_valid = in6_dev->cnf.temp_valid_lft - age;
2034                                if (max_valid < 0)
2035                                        max_valid = 0;
2036
2037                                max_prefered = in6_dev->cnf.temp_prefered_lft -
2038                                               in6_dev->cnf.max_desync_factor -
2039                                               age;
2040                                if (max_prefered < 0)
2041                                        max_prefered = 0;
2042
2043                                if (valid_lft > max_valid)
2044                                        valid_lft = max_valid;
2045
2046                                if (prefered_lft > max_prefered)
2047                                        prefered_lft = max_prefered;
2048
2049                                spin_lock(&ift->lock);
2050                                flags = ift->flags;
2051                                ift->valid_lft = valid_lft;
2052                                ift->prefered_lft = prefered_lft;
2053                                ift->tstamp = now;
2054                                if (prefered_lft > 0)
2055                                        ift->flags &= ~IFA_F_DEPRECATED;
2056
2057                                spin_unlock(&ift->lock);
2058                                if (!(flags&IFA_F_TENTATIVE))
2059                                        ipv6_ifa_notify(0, ift);
2060                        }
2061
2062                        if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2063                                /*
2064                                 * When a new public address is created as
2065                                 * described in [ADDRCONF], also create a new
2066                                 * temporary address. Also create a temporary
2067                                 * address if it's enabled but no temporary
2068                                 * address currently exists.
2069                                 */
2070                                read_unlock_bh(&in6_dev->lock);
2071                                ipv6_create_tempaddr(ifp, NULL);
2072                        } else {
2073                                read_unlock_bh(&in6_dev->lock);
2074                        }
2075#endif
2076                        in6_ifa_put(ifp);
2077                        addrconf_verify(0);
2078                }
2079        }
2080        inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2081        in6_dev_put(in6_dev);
2082}
2083
2084/*
2085 *      Set destination address.
2086 *      Special case for SIT interfaces where we create a new "virtual"
2087 *      device.
2088 */
2089int addrconf_set_dstaddr(struct net *net, void __user *arg)
2090{
2091        struct in6_ifreq ireq;
2092        struct net_device *dev;
2093        int err = -EINVAL;
2094
2095        rtnl_lock();
2096
2097        err = -EFAULT;
2098        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2099                goto err_exit;
2100
2101        dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2102
2103        err = -ENODEV;
2104        if (dev == NULL)
2105                goto err_exit;
2106
2107#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2108        if (dev->type == ARPHRD_SIT) {
2109                const struct net_device_ops *ops = dev->netdev_ops;
2110                struct ifreq ifr;
2111                struct ip_tunnel_parm p;
2112
2113                err = -EADDRNOTAVAIL;
2114                if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2115                        goto err_exit;
2116
2117                memset(&p, 0, sizeof(p));
2118                p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2119                p.iph.saddr = 0;
2120                p.iph.version = 4;
2121                p.iph.ihl = 5;
2122                p.iph.protocol = IPPROTO_IPV6;
2123                p.iph.ttl = 64;
2124                ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2125
2126                if (ops->ndo_do_ioctl) {
2127                        mm_segment_t oldfs = get_fs();
2128
2129                        set_fs(KERNEL_DS);
2130                        err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2131                        set_fs(oldfs);
2132                } else
2133                        err = -EOPNOTSUPP;
2134
2135                if (err == 0) {
2136                        err = -ENOBUFS;
2137                        dev = __dev_get_by_name(net, p.name);
2138                        if (!dev)
2139                                goto err_exit;
2140                        err = dev_open(dev);
2141                }
2142        }
2143#endif
2144
2145err_exit:
2146        rtnl_unlock();
2147        return err;
2148}
2149
2150/*
2151 *      Manual configuration of address on an interface
2152 */
2153static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2154                          unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2155                          __u32 valid_lft)
2156{
2157        struct inet6_ifaddr *ifp;
2158        struct inet6_dev *idev;
2159        struct net_device *dev;
2160        int scope;
2161        u32 flags;
2162        clock_t expires;
2163        unsigned long timeout;
2164
2165        ASSERT_RTNL();
2166
2167        if (plen > 128)
2168                return -EINVAL;
2169
2170        /* check the lifetime */
2171        if (!valid_lft || prefered_lft > valid_lft)
2172                return -EINVAL;
2173
2174        dev = __dev_get_by_index(net, ifindex);
2175        if (!dev)
2176                return -ENODEV;
2177
2178        idev = addrconf_add_dev(dev);
2179        if (IS_ERR(idev))
2180                return PTR_ERR(idev);
2181
2182        scope = ipv6_addr_scope(pfx);
2183
2184        timeout = addrconf_timeout_fixup(valid_lft, HZ);
2185        if (addrconf_finite_timeout(timeout)) {
2186                expires = jiffies_to_clock_t(timeout * HZ);
2187                valid_lft = timeout;
2188                flags = RTF_EXPIRES;
2189        } else {
2190                expires = 0;
2191                flags = 0;
2192                ifa_flags |= IFA_F_PERMANENT;
2193        }
2194
2195        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2196        if (addrconf_finite_timeout(timeout)) {
2197                if (timeout == 0)
2198                        ifa_flags |= IFA_F_DEPRECATED;
2199                prefered_lft = timeout;
2200        }
2201
2202        ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2203
2204        if (!IS_ERR(ifp)) {
2205                spin_lock_bh(&ifp->lock);
2206                ifp->valid_lft = valid_lft;
2207                ifp->prefered_lft = prefered_lft;
2208                ifp->tstamp = jiffies;
2209                spin_unlock_bh(&ifp->lock);
2210
2211                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2212                                      expires, flags);
2213                /*
2214                 * Note that section 3.1 of RFC 4429 indicates
2215                 * that the Optimistic flag should not be set for
2216                 * manually configured addresses
2217                 */
2218                addrconf_dad_start(ifp);
2219                in6_ifa_put(ifp);
2220                addrconf_verify(0);
2221                return 0;
2222        }
2223
2224        return PTR_ERR(ifp);
2225}
2226
2227static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2228                          unsigned int plen)
2229{
2230        struct inet6_ifaddr *ifp;
2231        struct inet6_dev *idev;
2232        struct net_device *dev;
2233
2234        if (plen > 128)
2235                return -EINVAL;
2236
2237        dev = __dev_get_by_index(net, ifindex);
2238        if (!dev)
2239                return -ENODEV;
2240
2241        if ((idev = __in6_dev_get(dev)) == NULL)
2242                return -ENXIO;
2243
2244        read_lock_bh(&idev->lock);
2245        list_for_each_entry(ifp, &idev->addr_list, if_list) {
2246                if (ifp->prefix_len == plen &&
2247                    ipv6_addr_equal(pfx, &ifp->addr)) {
2248                        in6_ifa_hold(ifp);
2249                        read_unlock_bh(&idev->lock);
2250
2251                        ipv6_del_addr(ifp);
2252
2253                        /* If the last address is deleted administratively,
2254                           disable IPv6 on this interface.
2255                         */
2256                        if (list_empty(&idev->addr_list))
2257                                addrconf_ifdown(idev->dev, 1);
2258                        return 0;
2259                }
2260        }
2261        read_unlock_bh(&idev->lock);
2262        return -EADDRNOTAVAIL;
2263}
2264
2265
2266int addrconf_add_ifaddr(struct net *net, void __user *arg)
2267{
2268        struct in6_ifreq ireq;
2269        int err;
2270
2271        if (!capable(CAP_NET_ADMIN))
2272                return -EPERM;
2273
2274        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2275                return -EFAULT;
2276
2277        rtnl_lock();
2278        err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2279                             ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2280                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2281        rtnl_unlock();
2282        return err;
2283}
2284
2285int addrconf_del_ifaddr(struct net *net, void __user *arg)
2286{
2287        struct in6_ifreq ireq;
2288        int err;
2289
2290        if (!capable(CAP_NET_ADMIN))
2291                return -EPERM;
2292
2293        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2294                return -EFAULT;
2295
2296        rtnl_lock();
2297        err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2298                             ireq.ifr6_prefixlen);
2299        rtnl_unlock();
2300        return err;
2301}
2302
2303static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2304                     int plen, int scope)
2305{
2306        struct inet6_ifaddr *ifp;
2307
2308        ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2309        if (!IS_ERR(ifp)) {
2310                spin_lock_bh(&ifp->lock);
2311                ifp->flags &= ~IFA_F_TENTATIVE;
2312                spin_unlock_bh(&ifp->lock);
2313                ipv6_ifa_notify(RTM_NEWADDR, ifp);
2314                in6_ifa_put(ifp);
2315        }
2316}
2317
2318#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2319static void sit_add_v4_addrs(struct inet6_dev *idev)
2320{
2321        struct in6_addr addr;
2322        struct net_device *dev;
2323        struct net *net = dev_net(idev->dev);
2324        int scope;
2325
2326        ASSERT_RTNL();
2327
2328        memset(&addr, 0, sizeof(struct in6_addr));
2329        memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2330
2331        if (idev->dev->flags&IFF_POINTOPOINT) {
2332                addr.s6_addr32[0] = htonl(0xfe800000);
2333                scope = IFA_LINK;
2334        } else {
2335                scope = IPV6_ADDR_COMPATv4;
2336        }
2337
2338        if (addr.s6_addr32[3]) {
2339                add_addr(idev, &addr, 128, scope);
2340                return;
2341        }
2342
2343        for_each_netdev(net, dev) {
2344                struct in_device *in_dev = __in_dev_get_rtnl(dev);
2345                if (in_dev && (dev->flags & IFF_UP)) {
2346                        struct in_ifaddr *ifa;
2347
2348                        int flag = scope;
2349
2350                        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2351                                int plen;
2352
2353                                addr.s6_addr32[3] = ifa->ifa_local;
2354
2355                                if (ifa->ifa_scope == RT_SCOPE_LINK)
2356                                        continue;
2357                                if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2358                                        if (idev->dev->flags&IFF_POINTOPOINT)
2359                                                continue;
2360                                        flag |= IFA_HOST;
2361                                }
2362                                if (idev->dev->flags&IFF_POINTOPOINT)
2363                                        plen = 64;
2364                                else
2365                                        plen = 96;
2366
2367                                add_addr(idev, &addr, plen, flag);
2368                        }
2369                }
2370        }
2371}
2372#endif
2373
2374static void init_loopback(struct net_device *dev)
2375{
2376        struct inet6_dev  *idev;
2377
2378        /* ::1 */
2379
2380        ASSERT_RTNL();
2381
2382        if ((idev = ipv6_find_idev(dev)) == NULL) {
2383                pr_debug("%s: add_dev failed\n", __func__);
2384                return;
2385        }
2386
2387        add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2388}
2389
2390static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2391{
2392        struct inet6_ifaddr *ifp;
2393        u32 addr_flags = IFA_F_PERMANENT;
2394
2395#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2396        if (idev->cnf.optimistic_dad &&
2397            !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2398                addr_flags |= IFA_F_OPTIMISTIC;
2399#endif
2400
2401
2402        ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2403        if (!IS_ERR(ifp)) {
2404                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2405                addrconf_dad_start(ifp);
2406                in6_ifa_put(ifp);
2407        }
2408}
2409
2410static void addrconf_dev_config(struct net_device *dev)
2411{
2412        struct in6_addr addr;
2413        struct inet6_dev *idev;
2414
2415        ASSERT_RTNL();
2416
2417        if ((dev->type != ARPHRD_ETHER) &&
2418            (dev->type != ARPHRD_FDDI) &&
2419            (dev->type != ARPHRD_ARCNET) &&
2420            (dev->type != ARPHRD_INFINIBAND) &&
2421            (dev->type != ARPHRD_IEEE802154)) {
2422                /* Alas, we support only Ethernet autoconfiguration. */
2423                return;
2424        }
2425
2426        idev = addrconf_add_dev(dev);
2427        if (IS_ERR(idev))
2428                return;
2429
2430        memset(&addr, 0, sizeof(struct in6_addr));
2431        addr.s6_addr32[0] = htonl(0xFE800000);
2432
2433        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2434                addrconf_add_linklocal(idev, &addr);
2435}
2436
2437#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2438static void addrconf_sit_config(struct net_device *dev)
2439{
2440        struct inet6_dev *idev;
2441
2442        ASSERT_RTNL();
2443
2444        /*
2445         * Configure the tunnel with one of our IPv4
2446         * addresses... we should configure all of
2447         * our v4 addrs in the tunnel
2448         */
2449
2450        if ((idev = ipv6_find_idev(dev)) == NULL) {
2451                pr_debug("%s: add_dev failed\n", __func__);
2452                return;
2453        }
2454
2455        if (dev->priv_flags & IFF_ISATAP) {
2456                struct in6_addr addr;
2457
2458                ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2459                addrconf_prefix_route(&addr, 64, dev, 0, 0);
2460                if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2461                        addrconf_add_linklocal(idev, &addr);
2462                return;
2463        }
2464
2465        sit_add_v4_addrs(idev);
2466
2467        if (dev->flags&IFF_POINTOPOINT)
2468                addrconf_add_mroute(dev);
2469        else
2470                sit_route_add(dev);
2471}
2472#endif
2473
2474#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2475static void addrconf_gre_config(struct net_device *dev)
2476{
2477        struct inet6_dev *idev;
2478        struct in6_addr addr;
2479
2480        pr_info("%s(%s)\n", __func__, dev->name);
2481
2482        ASSERT_RTNL();
2483
2484        if ((idev = ipv6_find_idev(dev)) == NULL) {
2485                pr_debug("%s: add_dev failed\n", __func__);
2486                return;
2487        }
2488
2489        ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2490        addrconf_prefix_route(&addr, 64, dev, 0, 0);
2491
2492        if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2493                addrconf_add_linklocal(idev, &addr);
2494}
2495#endif
2496
2497static inline int
2498ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2499{
2500        struct in6_addr lladdr;
2501
2502        if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2503                addrconf_add_linklocal(idev, &lladdr);
2504                return 0;
2505        }
2506        return -1;
2507}
2508
2509static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2510{
2511        struct net_device *link_dev;
2512        struct net *net = dev_net(idev->dev);
2513
2514        /* first try to inherit the link-local address from the link device */
2515        if (idev->dev->iflink &&
2516            (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2517                if (!ipv6_inherit_linklocal(idev, link_dev))
2518                        return;
2519        }
2520        /* then try to inherit it from any device */
2521        for_each_netdev(net, link_dev) {
2522                if (!ipv6_inherit_linklocal(idev, link_dev))
2523                        return;
2524        }
2525        pr_debug("init ip6-ip6: add_linklocal failed\n");
2526}
2527
2528/*
2529 * Autoconfigure tunnel with a link-local address so routing protocols,
2530 * DHCPv6, MLD etc. can be run over the virtual link
2531 */
2532
2533static void addrconf_ip6_tnl_config(struct net_device *dev)
2534{
2535        struct inet6_dev *idev;
2536
2537        ASSERT_RTNL();
2538
2539        idev = addrconf_add_dev(dev);
2540        if (IS_ERR(idev)) {
2541                pr_debug("init ip6-ip6: add_dev failed\n");
2542                return;
2543        }
2544        ip6_tnl_add_linklocal(idev);
2545}
2546
2547static int addrconf_notify(struct notifier_block *this, unsigned long event,
2548                           void *data)
2549{
2550        struct net_device *dev = (struct net_device *) data;
2551        struct inet6_dev *idev = __in6_dev_get(dev);
2552        int run_pending = 0;
2553        int err;
2554
2555        switch (event) {
2556        case NETDEV_REGISTER:
2557                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2558                        idev = ipv6_add_dev(dev);
2559                        if (!idev)
2560                                return notifier_from_errno(-ENOMEM);
2561                }
2562                break;
2563
2564        case NETDEV_UP:
2565        case NETDEV_CHANGE:
2566                if (dev->flags & IFF_SLAVE)
2567                        break;
2568
2569                if (event == NETDEV_UP) {
2570                        if (!addrconf_qdisc_ok(dev)) {
2571                                /* device is not ready yet. */
2572                                pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2573                                        dev->name);
2574                                break;
2575                        }
2576
2577                        if (!idev && dev->mtu >= IPV6_MIN_MTU)
2578                                idev = ipv6_add_dev(dev);
2579
2580                        if (idev) {
2581                                idev->if_flags |= IF_READY;
2582                                run_pending = 1;
2583                        }
2584                } else {
2585                        if (!addrconf_qdisc_ok(dev)) {
2586                                /* device is still not ready. */
2587                                break;
2588                        }
2589
2590                        if (idev) {
2591                                if (idev->if_flags & IF_READY)
2592                                        /* device is already configured. */
2593                                        break;
2594                                idev->if_flags |= IF_READY;
2595                        }
2596
2597                        pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2598                                dev->name);
2599
2600                        run_pending = 1;
2601                }
2602
2603                switch (dev->type) {
2604#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2605                case ARPHRD_SIT:
2606                        addrconf_sit_config(dev);
2607                        break;
2608#endif
2609#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2610                case ARPHRD_IPGRE:
2611                        addrconf_gre_config(dev);
2612                        break;
2613#endif
2614                case ARPHRD_TUNNEL6:
2615                        addrconf_ip6_tnl_config(dev);
2616                        break;
2617                case ARPHRD_LOOPBACK:
2618                        init_loopback(dev);
2619                        break;
2620
2621                default:
2622                        addrconf_dev_config(dev);
2623                        break;
2624                }
2625
2626                if (idev) {
2627                        if (run_pending)
2628                                addrconf_dad_run(idev);
2629
2630                        /*
2631                         * If the MTU changed during the interface down,
2632                         * when the interface up, the changed MTU must be
2633                         * reflected in the idev as well as routers.
2634                         */
2635                        if (idev->cnf.mtu6 != dev->mtu &&
2636                            dev->mtu >= IPV6_MIN_MTU) {
2637                                rt6_mtu_change(dev, dev->mtu);
2638                                idev->cnf.mtu6 = dev->mtu;
2639                        }
2640                        idev->tstamp = jiffies;
2641                        inet6_ifinfo_notify(RTM_NEWLINK, idev);
2642
2643                        /*
2644                         * If the changed mtu during down is lower than
2645                         * IPV6_MIN_MTU stop IPv6 on this interface.
2646                         */
2647                        if (dev->mtu < IPV6_MIN_MTU)
2648                                addrconf_ifdown(dev, 1);
2649                }
2650                break;
2651
2652        case NETDEV_CHANGEMTU:
2653                if (idev && dev->mtu >= IPV6_MIN_MTU) {
2654                        rt6_mtu_change(dev, dev->mtu);
2655                        idev->cnf.mtu6 = dev->mtu;
2656                        break;
2657                }
2658
2659                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2660                        idev = ipv6_add_dev(dev);
2661                        if (idev)
2662                                break;
2663                }
2664
2665                /*
2666                 * MTU falled under IPV6_MIN_MTU.
2667                 * Stop IPv6 on this interface.
2668                 */
2669
2670        case NETDEV_DOWN:
2671        case NETDEV_UNREGISTER:
2672                /*
2673                 *      Remove all addresses from this interface.
2674                 */
2675                addrconf_ifdown(dev, event != NETDEV_DOWN);
2676                break;
2677
2678        case NETDEV_CHANGENAME:
2679                if (idev) {
2680                        snmp6_unregister_dev(idev);
2681                        addrconf_sysctl_unregister(idev);
2682                        addrconf_sysctl_register(idev);
2683                        err = snmp6_register_dev(idev);
2684                        if (err)
2685                                return notifier_from_errno(err);
2686                }
2687                break;
2688
2689        case NETDEV_PRE_TYPE_CHANGE:
2690        case NETDEV_POST_TYPE_CHANGE:
2691                addrconf_type_change(dev, event);
2692                break;
2693        }
2694
2695        return NOTIFY_OK;
2696}
2697
2698/*
2699 *      addrconf module should be notified of a device going up
2700 */
2701static struct notifier_block ipv6_dev_notf = {
2702        .notifier_call = addrconf_notify,
2703};
2704
2705static void addrconf_type_change(struct net_device *dev, unsigned long event)
2706{
2707        struct inet6_dev *idev;
2708        ASSERT_RTNL();
2709
2710        idev = __in6_dev_get(dev);
2711
2712        if (event == NETDEV_POST_TYPE_CHANGE)
2713                ipv6_mc_remap(idev);
2714        else if (event == NETDEV_PRE_TYPE_CHANGE)
2715                ipv6_mc_unmap(idev);
2716}
2717
2718static int addrconf_ifdown(struct net_device *dev, int how)
2719{
2720        struct net *net = dev_net(dev);
2721        struct inet6_dev *idev;
2722        struct inet6_ifaddr *ifa;
2723        int state, i;
2724
2725        ASSERT_RTNL();
2726
2727        rt6_ifdown(net, dev);
2728        neigh_ifdown(&nd_tbl, dev);
2729
2730        idev = __in6_dev_get(dev);
2731        if (idev == NULL)
2732                return -ENODEV;
2733
2734        /*
2735         * Step 1: remove reference to ipv6 device from parent device.
2736         *         Do not dev_put!
2737         */
2738        if (how) {
2739                idev->dead = 1;
2740
2741                /* protected by rtnl_lock */
2742                RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2743
2744                /* Step 1.5: remove snmp6 entry */
2745                snmp6_unregister_dev(idev);
2746
2747        }
2748
2749        /* Step 2: clear hash table */
2750        for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2751                struct hlist_head *h = &inet6_addr_lst[i];
2752                struct hlist_node *n;
2753
2754                spin_lock_bh(&addrconf_hash_lock);
2755        restart:
2756                hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2757                        if (ifa->idev == idev) {
2758                                hlist_del_init_rcu(&ifa->addr_lst);
2759                                addrconf_del_timer(ifa);
2760                                goto restart;
2761                        }
2762                }
2763                spin_unlock_bh(&addrconf_hash_lock);
2764        }
2765
2766        write_lock_bh(&idev->lock);
2767
2768        /* Step 2: clear flags for stateless addrconf */
2769        if (!how)
2770                idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2771
2772#ifdef CONFIG_IPV6_PRIVACY
2773        if (how && del_timer(&idev->regen_timer))
2774                in6_dev_put(idev);
2775
2776        /* Step 3: clear tempaddr list */
2777        while (!list_empty(&idev->tempaddr_list)) {
2778                ifa = list_first_entry(&idev->tempaddr_list,
2779                                       struct inet6_ifaddr, tmp_list);
2780                list_del(&ifa->tmp_list);
2781                write_unlock_bh(&idev->lock);
2782                spin_lock_bh(&ifa->lock);
2783
2784                if (ifa->ifpub) {
2785                        in6_ifa_put(ifa->ifpub);
2786                        ifa->ifpub = NULL;
2787                }
2788                spin_unlock_bh(&ifa->lock);
2789                in6_ifa_put(ifa);
2790                write_lock_bh(&idev->lock);
2791        }
2792#endif
2793
2794        while (!list_empty(&idev->addr_list)) {
2795                ifa = list_first_entry(&idev->addr_list,
2796                                       struct inet6_ifaddr, if_list);
2797                addrconf_del_timer(ifa);
2798
2799                list_del(&ifa->if_list);
2800
2801                write_unlock_bh(&idev->lock);
2802
2803                spin_lock_bh(&ifa->state_lock);
2804                state = ifa->state;
2805                ifa->state = INET6_IFADDR_STATE_DEAD;
2806                spin_unlock_bh(&ifa->state_lock);
2807
2808                if (state != INET6_IFADDR_STATE_DEAD) {
2809                        __ipv6_ifa_notify(RTM_DELADDR, ifa);
2810                        atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2811                }
2812                in6_ifa_put(ifa);
2813
2814                write_lock_bh(&idev->lock);
2815        }
2816
2817        write_unlock_bh(&idev->lock);
2818
2819        /* Step 5: Discard multicast list */
2820        if (how)
2821                ipv6_mc_destroy_dev(idev);
2822        else
2823                ipv6_mc_down(idev);
2824
2825        idev->tstamp = jiffies;
2826
2827        /* Last: Shot the device (if unregistered) */
2828        if (how) {
2829                addrconf_sysctl_unregister(idev);
2830                neigh_parms_release(&nd_tbl, idev->nd_parms);
2831                neigh_ifdown(&nd_tbl, dev);
2832                in6_dev_put(idev);
2833        }
2834        return 0;
2835}
2836
2837static void addrconf_rs_timer(unsigned long data)
2838{
2839        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2840        struct inet6_dev *idev = ifp->idev;
2841
2842        read_lock(&idev->lock);
2843        if (idev->dead || !(idev->if_flags & IF_READY))
2844                goto out;
2845
2846        if (idev->cnf.forwarding)
2847                goto out;
2848
2849        /* Announcement received after solicitation was sent */
2850        if (idev->if_flags & IF_RA_RCVD)
2851                goto out;
2852
2853        spin_lock(&ifp->lock);
2854        if (ifp->probes++ < idev->cnf.rtr_solicits) {
2855                /* The wait after the last probe can be shorter */
2856                addrconf_mod_timer(ifp, AC_RS,
2857                                   (ifp->probes == idev->cnf.rtr_solicits) ?
2858                                   idev->cnf.rtr_solicit_delay :
2859                                   idev->cnf.rtr_solicit_interval);
2860                spin_unlock(&ifp->lock);
2861
2862                ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2863        } else {
2864                spin_unlock(&ifp->lock);
2865                /*
2866                 * Note: we do not support deprecated "all on-link"
2867                 * assumption any longer.
2868                 */
2869                pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
2870        }
2871
2872out:
2873        read_unlock(&idev->lock);
2874        in6_ifa_put(ifp);
2875}
2876
2877/*
2878 *      Duplicate Address Detection
2879 */
2880static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2881{
2882        unsigned long rand_num;
2883        struct inet6_dev *idev = ifp->idev;
2884
2885        if (ifp->flags & IFA_F_OPTIMISTIC)
2886                rand_num = 0;
2887        else
2888                rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2889
2890        ifp->probes = idev->cnf.dad_transmits;
2891        addrconf_mod_timer(ifp, AC_DAD, rand_num);
2892}
2893
2894static void addrconf_dad_start(struct inet6_ifaddr *ifp)
2895{
2896        struct inet6_dev *idev = ifp->idev;
2897        struct net_device *dev = idev->dev;
2898
2899        addrconf_join_solict(dev, &ifp->addr);
2900
2901        net_srandom(ifp->addr.s6_addr32[3]);
2902
2903        read_lock_bh(&idev->lock);
2904        spin_lock(&ifp->lock);
2905        if (ifp->state == INET6_IFADDR_STATE_DEAD)
2906                goto out;
2907
2908        if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2909            idev->cnf.accept_dad < 1 ||
2910            !(ifp->flags&IFA_F_TENTATIVE) ||
2911            ifp->flags & IFA_F_NODAD) {
2912                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2913                spin_unlock(&ifp->lock);
2914                read_unlock_bh(&idev->lock);
2915
2916                addrconf_dad_completed(ifp);
2917                return;
2918        }
2919
2920        if (!(idev->if_flags & IF_READY)) {
2921                spin_unlock(&ifp->lock);
2922                read_unlock_bh(&idev->lock);
2923                /*
2924                 * If the device is not ready:
2925                 * - keep it tentative if it is a permanent address.
2926                 * - otherwise, kill it.
2927                 */
2928                in6_ifa_hold(ifp);
2929                addrconf_dad_stop(ifp, 0);
2930                return;
2931        }
2932
2933        /*
2934         * Optimistic nodes can start receiving
2935         * Frames right away
2936         */
2937        if (ifp->flags & IFA_F_OPTIMISTIC)
2938                ip6_ins_rt(ifp->rt);
2939
2940        addrconf_dad_kick(ifp);
2941out:
2942        spin_unlock(&ifp->lock);
2943        read_unlock_bh(&idev->lock);
2944}
2945
2946static void addrconf_dad_timer(unsigned long data)
2947{
2948        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2949        struct inet6_dev *idev = ifp->idev;
2950        struct in6_addr mcaddr;
2951
2952        if (!ifp->probes && addrconf_dad_end(ifp))
2953                goto out;
2954
2955        read_lock(&idev->lock);
2956        if (idev->dead || !(idev->if_flags & IF_READY)) {
2957                read_unlock(&idev->lock);
2958                goto out;
2959        }
2960
2961        spin_lock(&ifp->lock);
2962        if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2963                spin_unlock(&ifp->lock);
2964                read_unlock(&idev->lock);
2965                goto out;
2966        }
2967
2968        if (ifp->probes == 0) {
2969                /*
2970                 * DAD was successful
2971                 */
2972
2973                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2974                spin_unlock(&ifp->lock);
2975                read_unlock(&idev->lock);
2976
2977                addrconf_dad_completed(ifp);
2978
2979                goto out;
2980        }
2981
2982        ifp->probes--;
2983        addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2984        spin_unlock(&ifp->lock);
2985        read_unlock(&idev->lock);
2986
2987        /* send a neighbour solicitation for our addr */
2988        addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2989        ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2990out:
2991        in6_ifa_put(ifp);
2992}
2993
2994static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2995{
2996        struct net_device *dev = ifp->idev->dev;
2997
2998        /*
2999         *      Configure the address for reception. Now it is valid.
3000         */
3001
3002        ipv6_ifa_notify(RTM_NEWADDR, ifp);
3003
3004        /* If added prefix is link local and we are prepared to process
3005           router advertisements, start sending router solicitations.
3006         */
3007
3008        if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3009             ifp->idev->cnf.accept_ra == 2) &&
3010            ifp->idev->cnf.rtr_solicits > 0 &&
3011            (dev->flags&IFF_LOOPBACK) == 0 &&
3012            (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3013                /*
3014                 *      If a host as already performed a random delay
3015                 *      [...] as part of DAD [...] there is no need
3016                 *      to delay again before sending the first RS
3017                 */
3018                ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3019
3020                spin_lock_bh(&ifp->lock);
3021                ifp->probes = 1;
3022                ifp->idev->if_flags |= IF_RS_SENT;
3023                addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3024                spin_unlock_bh(&ifp->lock);
3025        }
3026}
3027
3028static void addrconf_dad_run(struct inet6_dev *idev)
3029{
3030        struct inet6_ifaddr *ifp;
3031
3032        read_lock_bh(&idev->lock);
3033        list_for_each_entry(ifp, &idev->addr_list, if_list) {
3034                spin_lock(&ifp->lock);
3035                if (ifp->flags & IFA_F_TENTATIVE &&
3036                    ifp->state == INET6_IFADDR_STATE_DAD)
3037                        addrconf_dad_kick(ifp);
3038                spin_unlock(&ifp->lock);
3039        }
3040        read_unlock_bh(&idev->lock);
3041}
3042
3043#ifdef CONFIG_PROC_FS
3044struct if6_iter_state {
3045        struct seq_net_private p;
3046        int bucket;
3047        int offset;
3048};
3049
3050static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3051{
3052        struct inet6_ifaddr *ifa = NULL;
3053        struct if6_iter_state *state = seq->private;
3054        struct net *net = seq_file_net(seq);
3055        int p = 0;
3056
3057        /* initial bucket if pos is 0 */
3058        if (pos == 0) {
3059                state->bucket = 0;
3060                state->offset = 0;
3061        }
3062
3063        for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3064                struct hlist_node *n;
3065                hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3066                                         addr_lst) {
3067                        if (!net_eq(dev_net(ifa->idev->dev), net))
3068                                continue;
3069                        /* sync with offset */
3070                        if (p < state->offset) {
3071                                p++;
3072                                continue;
3073                        }
3074                        state->offset++;
3075                        return ifa;
3076                }
3077
3078                /* prepare for next bucket */
3079                state->offset = 0;
3080                p = 0;
3081        }
3082        return NULL;
3083}
3084
3085static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3086                                         struct inet6_ifaddr *ifa)
3087{
3088        struct if6_iter_state *state = seq->private;
3089        struct net *net = seq_file_net(seq);
3090        struct hlist_node *n = &ifa->addr_lst;
3091
3092        hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3093                if (!net_eq(dev_net(ifa->idev->dev), net))
3094                        continue;
3095                state->offset++;
3096                return ifa;
3097        }
3098
3099        while (++state->bucket < IN6_ADDR_HSIZE) {
3100                state->offset = 0;
3101                hlist_for_each_entry_rcu_bh(ifa, n,
3102                                     &inet6_addr_lst[state->bucket], addr_lst) {
3103                        if (!net_eq(dev_net(ifa->idev->dev), net))
3104                                continue;
3105                        state->offset++;
3106                        return ifa;
3107                }
3108        }
3109
3110        return NULL;
3111}
3112
3113static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3114        __acquires(rcu_bh)
3115{
3116        rcu_read_lock_bh();
3117        return if6_get_first(seq, *pos);
3118}
3119
3120static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3121{
3122        struct inet6_ifaddr *ifa;
3123
3124        ifa = if6_get_next(seq, v);
3125        ++*pos;
3126        return ifa;
3127}
3128
3129static void if6_seq_stop(struct seq_file *seq, void *v)
3130        __releases(rcu_bh)
3131{
3132        rcu_read_unlock_bh();
3133}
3134
3135static int if6_seq_show(struct seq_file *seq, void *v)
3136{
3137        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3138        seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3139                   &ifp->addr,
3140                   ifp->idev->dev->ifindex,
3141                   ifp->prefix_len,
3142                   ifp->scope,
3143                   ifp->flags,
3144                   ifp->idev->dev->name);
3145        return 0;
3146}
3147
3148static const struct seq_operations if6_seq_ops = {
3149        .start  = if6_seq_start,
3150        .next   = if6_seq_next,
3151        .show   = if6_seq_show,
3152        .stop   = if6_seq_stop,
3153};
3154
3155static int if6_seq_open(struct inode *inode, struct file *file)
3156{
3157        return seq_open_net(inode, file, &if6_seq_ops,
3158                            sizeof(struct if6_iter_state));
3159}
3160
3161static const struct file_operations if6_fops = {
3162        .owner          = THIS_MODULE,
3163        .open           = if6_seq_open,
3164        .read           = seq_read,
3165        .llseek         = seq_lseek,
3166        .release        = seq_release_net,
3167};
3168
3169static int __net_init if6_proc_net_init(struct net *net)
3170{
3171        if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3172                return -ENOMEM;
3173        return 0;
3174}
3175
3176static void __net_exit if6_proc_net_exit(struct net *net)
3177{
3178       proc_net_remove(net, "if_inet6");
3179}
3180
3181static struct pernet_operations if6_proc_net_ops = {
3182       .init = if6_proc_net_init,
3183       .exit = if6_proc_net_exit,
3184};
3185
3186int __init if6_proc_init(void)
3187{
3188        return register_pernet_subsys(&if6_proc_net_ops);
3189}
3190
3191void if6_proc_exit(void)
3192{
3193        unregister_pernet_subsys(&if6_proc_net_ops);
3194}
3195#endif  /* CONFIG_PROC_FS */
3196
3197#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3198/* Check if address is a home address configured on any interface. */
3199int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3200{
3201        int ret = 0;
3202        struct inet6_ifaddr *ifp = NULL;
3203        struct hlist_node *n;
3204        unsigned int hash = inet6_addr_hash(addr);
3205
3206        rcu_read_lock_bh();
3207        hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3208                if (!net_eq(dev_net(ifp->idev->dev), net))
3209                        continue;
3210                if (ipv6_addr_equal(&ifp->addr, addr) &&
3211                    (ifp->flags & IFA_F_HOMEADDRESS)) {
3212                        ret = 1;
3213                        break;
3214                }
3215        }
3216        rcu_read_unlock_bh();
3217        return ret;
3218}
3219#endif
3220
3221/*
3222 *      Periodic address status verification
3223 */
3224
3225static void addrconf_verify(unsigned long foo)
3226{
3227        unsigned long now, next, next_sec, next_sched;
3228        struct inet6_ifaddr *ifp;
3229        struct hlist_node *node;
3230        int i;
3231
3232        rcu_read_lock_bh();
3233        spin_lock(&addrconf_verify_lock);
3234        now = jiffies;
3235        next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3236
3237        del_timer(&addr_chk_timer);
3238
3239        for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3240restart:
3241                hlist_for_each_entry_rcu_bh(ifp, node,
3242                                         &inet6_addr_lst[i], addr_lst) {
3243                        unsigned long age;
3244
3245                        if (ifp->flags & IFA_F_PERMANENT)
3246                                continue;
3247
3248                        spin_lock(&ifp->lock);
3249                        /* We try to batch several events at once. */
3250                        age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3251
3252                        if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3253                            age >= ifp->valid_lft) {
3254                                spin_unlock(&ifp->lock);
3255                                in6_ifa_hold(ifp);
3256                                ipv6_del_addr(ifp);
3257                                goto restart;
3258                        } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3259                                spin_unlock(&ifp->lock);
3260                                continue;
3261                        } else if (age >= ifp->prefered_lft) {
3262                                /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3263                                int deprecate = 0;
3264
3265                                if (!(ifp->flags&IFA_F_DEPRECATED)) {
3266                                        deprecate = 1;
3267                                        ifp->flags |= IFA_F_DEPRECATED;
3268                                }
3269
3270                                if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3271                                        next = ifp->tstamp + ifp->valid_lft * HZ;
3272
3273                                spin_unlock(&ifp->lock);
3274
3275                                if (deprecate) {
3276                                        in6_ifa_hold(ifp);
3277
3278                                        ipv6_ifa_notify(0, ifp);
3279                                        in6_ifa_put(ifp);
3280                                        goto restart;
3281                                }
3282#ifdef CONFIG_IPV6_PRIVACY
3283                        } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3284                                   !(ifp->flags&IFA_F_TENTATIVE)) {
3285                                unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3286                                        ifp->idev->cnf.dad_transmits *
3287                                        ifp->idev->nd_parms->retrans_time / HZ;
3288
3289                                if (age >= ifp->prefered_lft - regen_advance) {
3290                                        struct inet6_ifaddr *ifpub = ifp->ifpub;
3291                                        if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3292                                                next = ifp->tstamp + ifp->prefered_lft * HZ;
3293                                        if (!ifp->regen_count && ifpub) {
3294                                                ifp->regen_count++;
3295                                                in6_ifa_hold(ifp);
3296                                                in6_ifa_hold(ifpub);
3297                                                spin_unlock(&ifp->lock);
3298
3299                                                spin_lock(&ifpub->lock);
3300                                                ifpub->regen_count = 0;
3301                                                spin_unlock(&ifpub->lock);
3302                                                ipv6_create_tempaddr(ifpub, ifp);
3303                                                in6_ifa_put(ifpub);
3304                                                in6_ifa_put(ifp);
3305                                                goto restart;
3306                                        }
3307                                } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3308                                        next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3309                                spin_unlock(&ifp->lock);
3310#endif
3311                        } else {
3312                                /* ifp->prefered_lft <= ifp->valid_lft */
3313                                if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3314                                        next = ifp->tstamp + ifp->prefered_lft * HZ;
3315                                spin_unlock(&ifp->lock);
3316                        }
3317                }
3318        }
3319
3320        next_sec = round_jiffies_up(next);
3321        next_sched = next;
3322
3323        /* If rounded timeout is accurate enough, accept it. */
3324        if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3325                next_sched = next_sec;
3326
3327        /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3328        if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3329                next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3330
3331        ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3332              now, next, next_sec, next_sched));
3333
3334        addr_chk_timer.expires = next_sched;
3335        add_timer(&addr_chk_timer);
3336        spin_unlock(&addrconf_verify_lock);
3337        rcu_read_unlock_bh();
3338}
3339
3340static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3341{
3342        struct in6_addr *pfx = NULL;
3343
3344        if (addr)
3345                pfx = nla_data(addr);
3346
3347        if (local) {
3348                if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3349                        pfx = NULL;
3350                else
3351                        pfx = nla_data(local);
3352        }
3353
3354        return pfx;
3355}
3356
3357static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3358        [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3359        [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3360        [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3361};
3362
3363static int
3364inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3365{
3366        struct net *net = sock_net(skb->sk);
3367        struct ifaddrmsg *ifm;
3368        struct nlattr *tb[IFA_MAX+1];
3369        struct in6_addr *pfx;
3370        int err;
3371
3372        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3373        if (err < 0)
3374                return err;
3375
3376        ifm = nlmsg_data(nlh);
3377        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3378        if (pfx == NULL)
3379                return -EINVAL;
3380
3381        return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3382}
3383
3384static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3385                             u32 prefered_lft, u32 valid_lft)
3386{
3387        u32 flags;
3388        clock_t expires;
3389        unsigned long timeout;
3390
3391        if (!valid_lft || (prefered_lft > valid_lft))
3392                return -EINVAL;
3393
3394        timeout = addrconf_timeout_fixup(valid_lft, HZ);
3395        if (addrconf_finite_timeout(timeout)) {
3396                expires = jiffies_to_clock_t(timeout * HZ);
3397                valid_lft = timeout;
3398                flags = RTF_EXPIRES;
3399        } else {
3400                expires = 0;
3401                flags = 0;
3402                ifa_flags |= IFA_F_PERMANENT;
3403        }
3404
3405        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3406        if (addrconf_finite_timeout(timeout)) {
3407                if (timeout == 0)
3408                        ifa_flags |= IFA_F_DEPRECATED;
3409                prefered_lft = timeout;
3410        }
3411
3412        spin_lock_bh(&ifp->lock);
3413        ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3414        ifp->tstamp = jiffies;
3415        ifp->valid_lft = valid_lft;
3416        ifp->prefered_lft = prefered_lft;
3417
3418        spin_unlock_bh(&ifp->lock);
3419        if (!(ifp->flags&IFA_F_TENTATIVE))
3420                ipv6_ifa_notify(0, ifp);
3421
3422        addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3423                              expires, flags);
3424        addrconf_verify(0);
3425
3426        return 0;
3427}
3428
3429static int
3430inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3431{
3432        struct net *net = sock_net(skb->sk);
3433        struct ifaddrmsg *ifm;
3434        struct nlattr *tb[IFA_MAX+1];
3435        struct in6_addr *pfx;
3436        struct inet6_ifaddr *ifa;
3437        struct net_device *dev;
3438        u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3439        u8 ifa_flags;
3440        int err;
3441
3442        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3443        if (err < 0)
3444                return err;
3445
3446        ifm = nlmsg_data(nlh);
3447        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3448        if (pfx == NULL)
3449                return -EINVAL;
3450
3451        if (tb[IFA_CACHEINFO]) {
3452                struct ifa_cacheinfo *ci;
3453
3454                ci = nla_data(tb[IFA_CACHEINFO]);
3455                valid_lft = ci->ifa_valid;
3456                preferred_lft = ci->ifa_prefered;
3457        } else {
3458                preferred_lft = INFINITY_LIFE_TIME;
3459                valid_lft = INFINITY_LIFE_TIME;
3460        }
3461
3462        dev =  __dev_get_by_index(net, ifm->ifa_index);
3463        if (dev == NULL)
3464                return -ENODEV;
3465
3466        /* We ignore other flags so far. */
3467        ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3468
3469        ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3470        if (ifa == NULL) {
3471                /*
3472                 * It would be best to check for !NLM_F_CREATE here but
3473                 * userspace alreay relies on not having to provide this.
3474                 */
3475                return inet6_addr_add(net, ifm->ifa_index, pfx,
3476                                      ifm->ifa_prefixlen, ifa_flags,
3477                                      preferred_lft, valid_lft);
3478        }
3479
3480        if (nlh->nlmsg_flags & NLM_F_EXCL ||
3481            !(nlh->nlmsg_flags & NLM_F_REPLACE))
3482                err = -EEXIST;
3483        else
3484                err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3485
3486        in6_ifa_put(ifa);
3487
3488        return err;
3489}
3490
3491static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3492                          u8 scope, int ifindex)
3493{
3494        struct ifaddrmsg *ifm;
3495
3496        ifm = nlmsg_data(nlh);
3497        ifm->ifa_family = AF_INET6;
3498        ifm->ifa_prefixlen = prefixlen;
3499        ifm->ifa_flags = flags;
3500        ifm->ifa_scope = scope;
3501        ifm->ifa_index = ifindex;
3502}
3503
3504static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3505                         unsigned long tstamp, u32 preferred, u32 valid)
3506{
3507        struct ifa_cacheinfo ci;
3508
3509        ci.cstamp = cstamp_delta(cstamp);
3510        ci.tstamp = cstamp_delta(tstamp);
3511        ci.ifa_prefered = preferred;
3512        ci.ifa_valid = valid;
3513
3514        return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3515}
3516
3517static inline int rt_scope(int ifa_scope)
3518{
3519        if (ifa_scope & IFA_HOST)
3520                return RT_SCOPE_HOST;
3521        else if (ifa_scope & IFA_LINK)
3522                return RT_SCOPE_LINK;
3523        else if (ifa_scope & IFA_SITE)
3524                return RT_SCOPE_SITE;
3525        else
3526                return RT_SCOPE_UNIVERSE;
3527}
3528
3529static inline int inet6_ifaddr_msgsize(void)
3530{
3531        return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3532               + nla_total_size(16) /* IFA_ADDRESS */
3533               + nla_total_size(sizeof(struct ifa_cacheinfo));
3534}
3535
3536static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3537                             u32 portid, u32 seq, int event, unsigned int flags)
3538{
3539        struct nlmsghdr  *nlh;
3540        u32 preferred, valid;
3541
3542        nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3543        if (nlh == NULL)
3544                return -EMSGSIZE;
3545
3546        put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3547                      ifa->idev->dev->ifindex);
3548
3549        if (!(ifa->flags&IFA_F_PERMANENT)) {
3550                preferred = ifa->prefered_lft;
3551                valid = ifa->valid_lft;
3552                if (preferred != INFINITY_LIFE_TIME) {
3553                        long tval = (jiffies - ifa->tstamp)/HZ;
3554                        if (preferred > tval)
3555                                preferred -= tval;
3556                        else
3557                                preferred = 0;
3558                        if (valid != INFINITY_LIFE_TIME) {
3559                                if (valid > tval)
3560                                        valid -= tval;
3561                                else
3562                                        valid = 0;
3563                        }
3564                }
3565        } else {
3566                preferred = INFINITY_LIFE_TIME;
3567                valid = INFINITY_LIFE_TIME;
3568        }
3569
3570        if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3571            put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3572                nlmsg_cancel(skb, nlh);
3573                return -EMSGSIZE;
3574        }
3575
3576        return nlmsg_end(skb, nlh);
3577}
3578
3579static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3580                                u32 portid, u32 seq, int event, u16 flags)
3581{
3582        struct nlmsghdr  *nlh;
3583        u8 scope = RT_SCOPE_UNIVERSE;
3584        int ifindex = ifmca->idev->dev->ifindex;
3585
3586        if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3587                scope = RT_SCOPE_SITE;
3588
3589        nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3590        if (nlh == NULL)
3591                return -EMSGSIZE;
3592
3593        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3594        if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3595            put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3596                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3597                nlmsg_cancel(skb, nlh);
3598                return -EMSGSIZE;
3599        }
3600
3601        return nlmsg_end(skb, nlh);
3602}
3603
3604static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3605                                u32 portid, u32 seq, int event, unsigned int flags)
3606{
3607        struct nlmsghdr  *nlh;
3608        u8 scope = RT_SCOPE_UNIVERSE;
3609        int ifindex = ifaca->aca_idev->dev->ifindex;
3610
3611        if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3612                scope = RT_SCOPE_SITE;
3613
3614        nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3615        if (nlh == NULL)
3616                return -EMSGSIZE;
3617
3618        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3619        if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3620            put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3621                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3622                nlmsg_cancel(skb, nlh);
3623                return -EMSGSIZE;
3624        }
3625
3626        return nlmsg_end(skb, nlh);
3627}
3628
3629enum addr_type_t {
3630        UNICAST_ADDR,
3631        MULTICAST_ADDR,
3632        ANYCAST_ADDR,
3633};
3634
3635/* called with rcu_read_lock() */
3636static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3637                          struct netlink_callback *cb, enum addr_type_t type,
3638                          int s_ip_idx, int *p_ip_idx)
3639{
3640        struct ifmcaddr6 *ifmca;
3641        struct ifacaddr6 *ifaca;
3642        int err = 1;
3643        int ip_idx = *p_ip_idx;
3644
3645        read_lock_bh(&idev->lock);
3646        switch (type) {
3647        case UNICAST_ADDR: {
3648                struct inet6_ifaddr *ifa;
3649
3650                /* unicast address incl. temp addr */
3651                list_for_each_entry(ifa, &idev->addr_list, if_list) {
3652                        if (++ip_idx < s_ip_idx)
3653                                continue;
3654                        err = inet6_fill_ifaddr(skb, ifa,
3655                                                NETLINK_CB(cb->skb).portid,
3656                                                cb->nlh->nlmsg_seq,
3657                                                RTM_NEWADDR,
3658                                                NLM_F_MULTI);
3659                        if (err <= 0)
3660                                break;
3661                }
3662                break;
3663        }
3664        case MULTICAST_ADDR:
3665                /* multicast address */
3666                for (ifmca = idev->mc_list; ifmca;
3667                     ifmca = ifmca->next, ip_idx++) {
3668                        if (ip_idx < s_ip_idx)
3669                                continue;
3670                        err = inet6_fill_ifmcaddr(skb, ifmca,
3671                                                  NETLINK_CB(cb->skb).portid,
3672                                                  cb->nlh->nlmsg_seq,
3673                                                  RTM_GETMULTICAST,
3674                                                  NLM_F_MULTI);
3675                        if (err <= 0)
3676                                break;
3677                }
3678                break;
3679        case ANYCAST_ADDR:
3680                /* anycast address */
3681                for (ifaca = idev->ac_list; ifaca;
3682                     ifaca = ifaca->aca_next, ip_idx++) {
3683                        if (ip_idx < s_ip_idx)
3684                                continue;
3685                        err = inet6_fill_ifacaddr(skb, ifaca,
3686                                                  NETLINK_CB(cb->skb).portid,
3687                                                  cb->nlh->nlmsg_seq,
3688                                                  RTM_GETANYCAST,
3689                                                  NLM_F_MULTI);
3690                        if (err <= 0)
3691                                break;
3692                }
3693                break;
3694        default:
3695                break;
3696        }
3697        read_unlock_bh(&idev->lock);
3698        *p_ip_idx = ip_idx;
3699        return err;
3700}
3701
3702static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3703                           enum addr_type_t type)
3704{
3705        struct net *net = sock_net(skb->sk);
3706        int h, s_h;
3707        int idx, ip_idx;
3708        int s_idx, s_ip_idx;
3709        struct net_device *dev;
3710        struct inet6_dev *idev;
3711        struct hlist_head *head;
3712        struct hlist_node *node;
3713
3714        s_h = cb->args[0];
3715        s_idx = idx = cb->args[1];
3716        s_ip_idx = ip_idx = cb->args[2];
3717
3718        rcu_read_lock();
3719        for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3720                idx = 0;
3721                head = &net->dev_index_head[h];
3722                hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3723                        if (idx < s_idx)
3724                                goto cont;
3725                        if (h > s_h || idx > s_idx)
3726                                s_ip_idx = 0;
3727                        ip_idx = 0;
3728                        idev = __in6_dev_get(dev);
3729                        if (!idev)
3730                                goto cont;
3731
3732                        if (in6_dump_addrs(idev, skb, cb, type,
3733                                           s_ip_idx, &ip_idx) <= 0)
3734                                goto done;
3735cont:
3736                        idx++;
3737                }
3738        }
3739done:
3740        rcu_read_unlock();
3741        cb->args[0] = h;
3742        cb->args[1] = idx;
3743        cb->args[2] = ip_idx;
3744
3745        return skb->len;
3746}
3747
3748static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3749{
3750        enum addr_type_t type = UNICAST_ADDR;
3751
3752        return inet6_dump_addr(skb, cb, type);
3753}
3754
3755static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3756{
3757        enum addr_type_t type = MULTICAST_ADDR;
3758
3759        return inet6_dump_addr(skb, cb, type);
3760}
3761
3762
3763static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3764{
3765        enum addr_type_t type = ANYCAST_ADDR;
3766
3767        return inet6_dump_addr(skb, cb, type);
3768}
3769
3770static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3771                             void *arg)
3772{
3773        struct net *net = sock_net(in_skb->sk);
3774        struct ifaddrmsg *ifm;
3775        struct nlattr *tb[IFA_MAX+1];
3776        struct in6_addr *addr = NULL;
3777        struct net_device *dev = NULL;
3778        struct inet6_ifaddr *ifa;
3779        struct sk_buff *skb;
3780        int err;
3781
3782        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3783        if (err < 0)
3784                goto errout;
3785
3786        addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3787        if (addr == NULL) {
3788                err = -EINVAL;
3789                goto errout;
3790        }
3791
3792        ifm = nlmsg_data(nlh);
3793        if (ifm->ifa_index)
3794                dev = __dev_get_by_index(net, ifm->ifa_index);
3795
3796        ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3797        if (!ifa) {
3798                err = -EADDRNOTAVAIL;
3799                goto errout;
3800        }
3801
3802        skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3803        if (!skb) {
3804                err = -ENOBUFS;
3805                goto errout_ifa;
3806        }
3807
3808        err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3809                                nlh->nlmsg_seq, RTM_NEWADDR, 0);
3810        if (err < 0) {
3811                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3812                WARN_ON(err == -EMSGSIZE);
3813                kfree_skb(skb);
3814                goto errout_ifa;
3815        }
3816        err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3817errout_ifa:
3818        in6_ifa_put(ifa);
3819errout:
3820        return err;
3821}
3822
3823static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3824{
3825        struct sk_buff *skb;
3826        struct net *net = dev_net(ifa->idev->dev);
3827        int err = -ENOBUFS;
3828
3829        skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3830        if (skb == NULL)
3831                goto errout;
3832
3833        err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3834        if (err < 0) {
3835                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3836                WARN_ON(err == -EMSGSIZE);
3837                kfree_skb(skb);
3838                goto errout;
3839        }
3840        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3841        return;
3842errout:
3843        if (err < 0)
3844                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3845}
3846
3847static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3848                                __s32 *array, int bytes)
3849{
3850        BUG_ON(bytes < (DEVCONF_MAX * 4));
3851
3852        memset(array, 0, bytes);
3853        array[DEVCONF_FORWARDING] = cnf->forwarding;
3854        array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3855        array[DEVCONF_MTU6] = cnf->mtu6;
3856        array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3857        array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3858        array[DEVCONF_AUTOCONF] = cnf->autoconf;
3859        array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3860        array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3861        array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3862                jiffies_to_msecs(cnf->rtr_solicit_interval);
3863        array[DEVCONF_RTR_SOLICIT_DELAY] =
3864                jiffies_to_msecs(cnf->rtr_solicit_delay);
3865        array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3866#ifdef CONFIG_IPV6_PRIVACY
3867        array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3868        array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3869        array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3870        array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3871        array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3872#endif
3873        array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3874        array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3875        array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3876#ifdef CONFIG_IPV6_ROUTER_PREF
3877        array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3878        array[DEVCONF_RTR_PROBE_INTERVAL] =
3879                jiffies_to_msecs(cnf->rtr_probe_interval);
3880#ifdef CONFIG_IPV6_ROUTE_INFO
3881        array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3882#endif
3883#endif
3884        array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3885        array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3886#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3887        array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3888#endif
3889#ifdef CONFIG_IPV6_MROUTE
3890        array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3891#endif
3892        array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3893        array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3894        array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3895}
3896
3897static inline size_t inet6_ifla6_size(void)
3898{
3899        return nla_total_size(4) /* IFLA_INET6_FLAGS */
3900             + nla_total_size(sizeof(struct ifla_cacheinfo))
3901             + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3902             + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3903             + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3904}
3905
3906static inline size_t inet6_if_nlmsg_size(void)
3907{
3908        return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3909               + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3910               + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3911               + nla_total_size(4) /* IFLA_MTU */
3912               + nla_total_size(4) /* IFLA_LINK */
3913               + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3914}
3915
3916static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3917                                      int items, int bytes)
3918{
3919        int i;
3920        int pad = bytes - sizeof(u64) * items;
3921        BUG_ON(pad < 0);
3922
3923        /* Use put_unaligned() because stats may not be aligned for u64. */
3924        put_unaligned(items, &stats[0]);
3925        for (i = 1; i < items; i++)
3926                put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3927
3928        memset(&stats[items], 0, pad);
3929}
3930
3931static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3932                                      int items, int bytes, size_t syncpoff)
3933{
3934        int i;
3935        int pad = bytes - sizeof(u64) * items;
3936        BUG_ON(pad < 0);
3937
3938        /* Use put_unaligned() because stats may not be aligned for u64. */
3939        put_unaligned(items, &stats[0]);
3940        for (i = 1; i < items; i++)
3941                put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3942
3943        memset(&stats[items], 0, pad);
3944}
3945
3946static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3947                             int bytes)
3948{
3949        switch (attrtype) {
3950        case IFLA_INET6_STATS:
3951                __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3952                                     IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3953                break;
3954        case IFLA_INET6_ICMP6STATS:
3955                __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3956                break;
3957        }
3958}
3959
3960static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3961{
3962        struct nlattr *nla;
3963        struct ifla_cacheinfo ci;
3964
3965        if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3966                goto nla_put_failure;
3967        ci.max_reasm_len = IPV6_MAXPLEN;
3968        ci.tstamp = cstamp_delta(idev->tstamp);
3969        ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3970        ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3971        if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3972                goto nla_put_failure;
3973        nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3974        if (nla == NULL)
3975                goto nla_put_failure;
3976        ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3977
3978        /* XXX - MC not implemented */
3979
3980        nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3981        if (nla == NULL)
3982                goto nla_put_failure;
3983        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3984
3985        nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3986        if (nla == NULL)
3987                goto nla_put_failure;
3988        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3989
3990        return 0;
3991
3992nla_put_failure:
3993        return -EMSGSIZE;
3994}
3995
3996static size_t inet6_get_link_af_size(const struct net_device *dev)
3997{
3998        if (!__in6_dev_get(dev))
3999                return 0;
4000
4001        return inet6_ifla6_size();
4002}
4003
4004static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4005{
4006        struct inet6_dev *idev = __in6_dev_get(dev);
4007
4008        if (!idev)
4009                return -ENODATA;
4010
4011        if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4012                return -EMSGSIZE;
4013
4014        return 0;
4015}
4016
4017static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4018                             u32 portid, u32 seq, int event, unsigned int flags)
4019{
4020        struct net_device *dev = idev->dev;
4021        struct ifinfomsg *hdr;
4022        struct nlmsghdr *nlh;
4023        void *protoinfo;
4024
4025        nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4026        if (nlh == NULL)
4027                return -EMSGSIZE;
4028
4029        hdr = nlmsg_data(nlh);
4030        hdr->ifi_family = AF_INET6;
4031        hdr->__ifi_pad = 0;
4032        hdr->ifi_type = dev->type;
4033        hdr->ifi_index = dev->ifindex;
4034        hdr->ifi_flags = dev_get_flags(dev);
4035        hdr->ifi_change = 0;
4036
4037        if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4038            (dev->addr_len &&
4039             nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4040            nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4041            (dev->ifindex != dev->iflink &&
4042             nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4043                goto nla_put_failure;
4044        protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4045        if (protoinfo == NULL)
4046                goto nla_put_failure;
4047
4048        if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4049                goto nla_put_failure;
4050
4051        nla_nest_end(skb, protoinfo);
4052        return nlmsg_end(skb, nlh);
4053
4054nla_put_failure:
4055        nlmsg_cancel(skb, nlh);
4056        return -EMSGSIZE;
4057}
4058
4059static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4060{
4061        struct net *net = sock_net(skb->sk);
4062        int h, s_h;
4063        int idx = 0, s_idx;
4064        struct net_device *dev;
4065        struct inet6_dev *idev;
4066        struct hlist_head *head;
4067        struct hlist_node *node;
4068
4069        s_h = cb->args[0];
4070        s_idx = cb->args[1];
4071
4072        rcu_read_lock();
4073        for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4074                idx = 0;
4075                head = &net->dev_index_head[h];
4076                hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4077                        if (idx < s_idx)
4078                                goto cont;
4079                        idev = __in6_dev_get(dev);
4080                        if (!idev)
4081                                goto cont;
4082                        if (inet6_fill_ifinfo(skb, idev,
4083                                              NETLINK_CB(cb->skb).portid,
4084                                              cb->nlh->nlmsg_seq,
4085                                              RTM_NEWLINK, NLM_F_MULTI) <= 0)
4086                                goto out;
4087cont:
4088                        idx++;
4089                }
4090        }
4091out:
4092        rcu_read_unlock();
4093        cb->args[1] = idx;
4094        cb->args[0] = h;
4095
4096        return skb->len;
4097}
4098
4099void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4100{
4101        struct sk_buff *skb;
4102        struct net *net = dev_net(idev->dev);
4103        int err = -ENOBUFS;
4104
4105        skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4106        if (skb == NULL)
4107                goto errout;
4108
4109        err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4110        if (err < 0) {
4111                /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4112                WARN_ON(err == -EMSGSIZE);
4113                kfree_skb(skb);
4114                goto errout;
4115        }
4116        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4117        return;
4118errout:
4119        if (err < 0)
4120                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4121}
4122
4123static inline size_t inet6_prefix_nlmsg_size(void)
4124{
4125        return NLMSG_ALIGN(sizeof(struct prefixmsg))
4126               + nla_total_size(sizeof(struct in6_addr))
4127               + nla_total_size(sizeof(struct prefix_cacheinfo));
4128}
4129
4130static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4131                             struct prefix_info *pinfo, u32 portid, u32 seq,
4132                             int event, unsigned int flags)
4133{
4134        struct prefixmsg *pmsg;
4135        struct nlmsghdr *nlh;
4136        struct prefix_cacheinfo ci;
4137
4138        nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4139        if (nlh == NULL)
4140                return -EMSGSIZE;
4141
4142        pmsg = nlmsg_data(nlh);
4143        pmsg->prefix_family = AF_INET6;
4144        pmsg->prefix_pad1 = 0;
4145        pmsg->prefix_pad2 = 0;
4146        pmsg->prefix_ifindex = idev->dev->ifindex;
4147        pmsg->prefix_len = pinfo->prefix_len;
4148        pmsg->prefix_type = pinfo->type;
4149        pmsg->prefix_pad3 = 0;
4150        pmsg->prefix_flags = 0;
4151        if (pinfo->onlink)
4152                pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4153        if (pinfo->autoconf)
4154                pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4155
4156        if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4157                goto nla_put_failure;
4158        ci.preferred_time = ntohl(pinfo->prefered);
4159        ci.valid_time = ntohl(pinfo->valid);
4160        if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4161                goto nla_put_failure;
4162        return nlmsg_end(skb, nlh);
4163
4164nla_put_failure:
4165        nlmsg_cancel(skb, nlh);
4166        return -EMSGSIZE;
4167}
4168
4169static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4170                         struct prefix_info *pinfo)
4171{
4172        struct sk_buff *skb;
4173        struct net *net = dev_net(idev->dev);
4174        int err = -ENOBUFS;
4175
4176        skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4177        if (skb == NULL)
4178                goto errout;
4179
4180        err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4181        if (err < 0) {
4182                /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4183                WARN_ON(err == -EMSGSIZE);
4184                kfree_skb(skb);
4185                goto errout;
4186        }
4187        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4188        return;
4189errout:
4190        if (err < 0)
4191                rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4192}
4193
4194static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4195{
4196        inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4197
4198        switch (event) {
4199        case RTM_NEWADDR:
4200                /*
4201                 * If the address was optimistic
4202                 * we inserted the route at the start of
4203                 * our DAD process, so we don't need
4204                 * to do it again
4205                 */
4206                if (!(ifp->rt->rt6i_node))
4207                        ip6_ins_rt(ifp->rt);
4208                if (ifp->idev->cnf.forwarding)
4209                        addrconf_join_anycast(ifp);
4210                break;
4211        case RTM_DELADDR:
4212                if (ifp->idev->cnf.forwarding)
4213                        addrconf_leave_anycast(ifp);
4214                addrconf_leave_solict(ifp->idev, &ifp->addr);
4215                dst_hold(&ifp->rt->dst);
4216
4217                if (ip6_del_rt(ifp->rt))
4218                        dst_free(&ifp->rt->dst);
4219                break;
4220        }
4221}
4222
4223static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4224{
4225        rcu_read_lock_bh();
4226        if (likely(ifp->idev->dead == 0))
4227                __ipv6_ifa_notify(event, ifp);
4228        rcu_read_unlock_bh();
4229}
4230
4231#ifdef CONFIG_SYSCTL
4232
4233static
4234int addrconf_sysctl_forward(ctl_table *ctl, int write,
4235                           void __user *buffer, size_t *lenp, loff_t *ppos)
4236{
4237        int *valp = ctl->data;
4238        int val = *valp;
4239        loff_t pos = *ppos;
4240        ctl_table lctl;
4241        int ret;
4242
4243        /*
4244         * ctl->data points to idev->cnf.forwarding, we should
4245         * not modify it until we get the rtnl lock.
4246         */
4247        lctl = *ctl;
4248        lctl.data = &val;
4249
4250        ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4251
4252        if (write)
4253                ret = addrconf_fixup_forwarding(ctl, valp, val);
4254        if (ret)
4255                *ppos = pos;
4256        return ret;
4257}
4258
4259static void dev_disable_change(struct inet6_dev *idev)
4260{
4261        if (!idev || !idev->dev)
4262                return;
4263
4264        if (idev->cnf.disable_ipv6)
4265                addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4266        else
4267                addrconf_notify(NULL, NETDEV_UP, idev->dev);
4268}
4269
4270static void addrconf_disable_change(struct net *net, __s32 newf)
4271{
4272        struct net_device *dev;
4273        struct inet6_dev *idev;
4274
4275        rcu_read_lock();
4276        for_each_netdev_rcu(net, dev) {
4277                idev = __in6_dev_get(dev);
4278                if (idev) {
4279                        int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4280                        idev->cnf.disable_ipv6 = newf;
4281                        if (changed)
4282                                dev_disable_change(idev);
4283                }
4284        }
4285        rcu_read_unlock();
4286}
4287
4288static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4289{
4290        struct net *net;
4291        int old;
4292
4293        if (!rtnl_trylock())
4294                return restart_syscall();
4295
4296        net = (struct net *)table->extra2;
4297        old = *p;
4298        *p = newf;
4299
4300        if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4301                rtnl_unlock();
4302                return 0;
4303        }
4304
4305        if (p == &net->ipv6.devconf_all->disable_ipv6) {
4306                net->ipv6.devconf_dflt->disable_ipv6 = newf;
4307                addrconf_disable_change(net, newf);
4308        } else if ((!newf) ^ (!old))
4309                dev_disable_change((struct inet6_dev *)table->extra1);
4310
4311        rtnl_unlock();
4312        return 0;
4313}
4314
4315static
4316int addrconf_sysctl_disable(ctl_table *ctl, int write,
4317                            void __user *buffer, size_t *lenp, loff_t *ppos)
4318{
4319        int *valp = ctl->data;
4320        int val = *valp;
4321        loff_t pos = *ppos;
4322        ctl_table lctl;
4323        int ret;
4324
4325        /*
4326         * ctl->data points to idev->cnf.disable_ipv6, we should
4327         * not modify it until we get the rtnl lock.
4328         */
4329        lctl = *ctl;
4330        lctl.data = &val;
4331
4332        ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4333
4334        if (write)
4335                ret = addrconf_disable_ipv6(ctl, valp, val);
4336        if (ret)
4337                *ppos = pos;
4338        return ret;
4339}
4340
4341static struct addrconf_sysctl_table
4342{
4343        struct ctl_table_header *sysctl_header;
4344        ctl_table addrconf_vars[DEVCONF_MAX+1];
4345} addrconf_sysctl __read_mostly = {
4346        .sysctl_header = NULL,
4347        .addrconf_vars = {
4348                {
4349                        .procname       = "forwarding",
4350                        .data           = &ipv6_devconf.forwarding,
4351                        .maxlen         = sizeof(int),
4352                        .mode           = 0644,
4353                        .proc_handler   = addrconf_sysctl_forward,
4354                },
4355                {
4356                        .procname       = "hop_limit",
4357                        .data           = &ipv6_devconf.hop_limit,
4358                        .maxlen         = sizeof(int),
4359                        .mode           = 0644,
4360                        .proc_handler   = proc_dointvec,
4361                },
4362                {
4363                        .procname       = "mtu",
4364                        .data           = &ipv6_devconf.mtu6,
4365                        .maxlen         = sizeof(int),
4366                        .mode           = 0644,
4367                        .proc_handler   = proc_dointvec,
4368                },
4369                {
4370                        .procname       = "accept_ra",
4371                        .data           = &ipv6_devconf.accept_ra,
4372                        .maxlen         = sizeof(int),
4373                        .mode           = 0644,
4374                        .proc_handler   = proc_dointvec,
4375                },
4376                {
4377                        .procname       = "accept_redirects",
4378                        .data           = &ipv6_devconf.accept_redirects,
4379                        .maxlen         = sizeof(int),
4380                        .mode           = 0644,
4381                        .proc_handler   = proc_dointvec,
4382                },
4383                {
4384                        .procname       = "autoconf",
4385                        .data           = &ipv6_devconf.autoconf,
4386                        .maxlen         = sizeof(int),
4387                        .mode           = 0644,
4388                        .proc_handler   = proc_dointvec,
4389                },
4390                {
4391                        .procname       = "dad_transmits",
4392                        .data           = &ipv6_devconf.dad_transmits,
4393                        .maxlen         = sizeof(int),
4394                        .mode           = 0644,
4395                        .proc_handler   = proc_dointvec,
4396                },
4397                {
4398                        .procname       = "router_solicitations",
4399                        .data           = &ipv6_devconf.rtr_solicits,
4400                        .maxlen         = sizeof(int),
4401                        .mode           = 0644,
4402                        .proc_handler   = proc_dointvec,
4403                },
4404                {
4405                        .procname       = "router_solicitation_interval",
4406                        .data           = &ipv6_devconf.rtr_solicit_interval,
4407                        .maxlen         = sizeof(int),
4408                        .mode           = 0644,
4409                        .proc_handler   = proc_dointvec_jiffies,
4410                },
4411                {
4412                        .procname       = "router_solicitation_delay",
4413                        .data           = &ipv6_devconf.rtr_solicit_delay,
4414                        .maxlen         = sizeof(int),
4415                        .mode           = 0644,
4416                        .proc_handler   = proc_dointvec_jiffies,
4417                },
4418                {
4419                        .procname       = "force_mld_version",
4420                        .data           = &ipv6_devconf.force_mld_version,
4421                        .maxlen         = sizeof(int),
4422                        .mode           = 0644,
4423                        .proc_handler   = proc_dointvec,
4424                },
4425#ifdef CONFIG_IPV6_PRIVACY
4426                {
4427                        .procname       = "use_tempaddr",
4428                        .data           = &ipv6_devconf.use_tempaddr,
4429                        .maxlen         = sizeof(int),
4430                        .mode           = 0644,
4431                        .proc_handler   = proc_dointvec,
4432                },
4433                {
4434                        .procname       = "temp_valid_lft",
4435                        .data           = &ipv6_devconf.temp_valid_lft,
4436                        .maxlen         = sizeof(int),
4437                        .mode           = 0644,
4438                        .proc_handler   = proc_dointvec,
4439                },
4440                {
4441                        .procname       = "temp_prefered_lft",
4442                        .data           = &ipv6_devconf.temp_prefered_lft,
4443                        .maxlen         = sizeof(int),
4444                        .mode           = 0644,
4445                        .proc_handler   = proc_dointvec,
4446                },
4447                {
4448                        .procname       = "regen_max_retry",
4449                        .data           = &ipv6_devconf.regen_max_retry,
4450                        .maxlen         = sizeof(int),
4451                        .mode           = 0644,
4452                        .proc_handler   = proc_dointvec,
4453                },
4454                {
4455                        .procname       = "max_desync_factor",
4456                        .data           = &ipv6_devconf.max_desync_factor,
4457                        .maxlen         = sizeof(int),
4458                        .mode           = 0644,
4459                        .proc_handler   = proc_dointvec,
4460                },
4461#endif
4462                {
4463                        .procname       = "max_addresses",
4464                        .data           = &ipv6_devconf.max_addresses,
4465                        .maxlen         = sizeof(int),
4466                        .mode           = 0644,
4467                        .proc_handler   = proc_dointvec,
4468                },
4469                {
4470                        .procname       = "accept_ra_defrtr",
4471                        .data           = &ipv6_devconf.accept_ra_defrtr,
4472                        .maxlen         = sizeof(int),
4473                        .mode           = 0644,
4474                        .proc_handler   = proc_dointvec,
4475                },
4476                {
4477                        .procname       = "accept_ra_pinfo",
4478                        .data           = &ipv6_devconf.accept_ra_pinfo,
4479                        .maxlen         = sizeof(int),
4480                        .mode           = 0644,
4481                        .proc_handler   = proc_dointvec,
4482                },
4483#ifdef CONFIG_IPV6_ROUTER_PREF
4484                {
4485                        .procname       = "accept_ra_rtr_pref",
4486                        .data           = &ipv6_devconf.accept_ra_rtr_pref,
4487                        .maxlen         = sizeof(int),
4488                        .mode           = 0644,
4489                        .proc_handler   = proc_dointvec,
4490                },
4491                {
4492                        .procname       = "router_probe_interval",
4493                        .data           = &ipv6_devconf.rtr_probe_interval,
4494                        .maxlen         = sizeof(int),
4495                        .mode           = 0644,
4496                        .proc_handler   = proc_dointvec_jiffies,
4497                },
4498#ifdef CONFIG_IPV6_ROUTE_INFO
4499                {
4500                        .procname       = "accept_ra_rt_info_max_plen",
4501                        .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4502                        .maxlen         = sizeof(int),
4503                        .mode           = 0644,
4504                        .proc_handler   = proc_dointvec,
4505                },
4506#endif
4507#endif
4508                {
4509                        .procname       = "proxy_ndp",
4510                        .data           = &ipv6_devconf.proxy_ndp,
4511                        .maxlen         = sizeof(int),
4512                        .mode           = 0644,
4513                        .proc_handler   = proc_dointvec,
4514                },
4515                {
4516                        .procname       = "accept_source_route",
4517                        .data           = &ipv6_devconf.accept_source_route,
4518                        .maxlen         = sizeof(int),
4519                        .mode           = 0644,
4520                        .proc_handler   = proc_dointvec,
4521                },
4522#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4523                {
4524                        .procname       = "optimistic_dad",
4525                        .data           = &ipv6_devconf.optimistic_dad,
4526                        .maxlen         = sizeof(int),
4527                        .mode           = 0644,
4528                        .proc_handler   = proc_dointvec,
4529
4530                },
4531#endif
4532#ifdef CONFIG_IPV6_MROUTE
4533                {
4534                        .procname       = "mc_forwarding",
4535                        .data           = &ipv6_devconf.mc_forwarding,
4536                        .maxlen         = sizeof(int),
4537                        .mode           = 0444,
4538                        .proc_handler   = proc_dointvec,
4539                },
4540#endif
4541                {
4542                        .procname       = "disable_ipv6",
4543                        .data           = &ipv6_devconf.disable_ipv6,
4544                        .maxlen         = sizeof(int),
4545                        .mode           = 0644,
4546                        .proc_handler   = addrconf_sysctl_disable,
4547                },
4548                {
4549                        .procname       = "accept_dad",
4550                        .data           = &ipv6_devconf.accept_dad,
4551                        .maxlen         = sizeof(int),
4552                        .mode           = 0644,
4553                        .proc_handler   = proc_dointvec,
4554                },
4555                {
4556                        .procname       = "force_tllao",
4557                        .data           = &ipv6_devconf.force_tllao,
4558                        .maxlen         = sizeof(int),
4559                        .mode           = 0644,
4560                        .proc_handler   = proc_dointvec
4561                },
4562                {
4563                        /* sentinel */
4564                }
4565        },
4566};
4567
4568static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4569                struct inet6_dev *idev, struct ipv6_devconf *p)
4570{
4571        int i;
4572        struct addrconf_sysctl_table *t;
4573        char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4574
4575        t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4576        if (t == NULL)
4577                goto out;
4578
4579        for (i = 0; t->addrconf_vars[i].data; i++) {
4580                t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4581                t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4582                t->addrconf_vars[i].extra2 = net;
4583        }
4584
4585        snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4586
4587        t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4588        if (t->sysctl_header == NULL)
4589                goto free;
4590
4591        p->sysctl = t;
4592        return 0;
4593
4594free:
4595        kfree(t);
4596out:
4597        return -ENOBUFS;
4598}
4599
4600static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4601{
4602        struct addrconf_sysctl_table *t;
4603
4604        if (p->sysctl == NULL)
4605                return;
4606
4607        t = p->sysctl;
4608        p->sysctl = NULL;
4609        unregister_net_sysctl_table(t->sysctl_header);
4610        kfree(t);
4611}
4612
4613static void addrconf_sysctl_register(struct inet6_dev *idev)
4614{
4615        neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4616                              &ndisc_ifinfo_sysctl_change);
4617        __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4618                                        idev, &idev->cnf);
4619}
4620
4621static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4622{
4623        __addrconf_sysctl_unregister(&idev->cnf);
4624        neigh_sysctl_unregister(idev->nd_parms);
4625}
4626
4627
4628#endif
4629
4630static int __net_init addrconf_init_net(struct net *net)
4631{
4632        int err;
4633        struct ipv6_devconf *all, *dflt;
4634
4635        err = -ENOMEM;
4636        all = &ipv6_devconf;
4637        dflt = &ipv6_devconf_dflt;
4638
4639        if (!net_eq(net, &init_net)) {
4640                all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4641                if (all == NULL)
4642                        goto err_alloc_all;
4643
4644                dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4645                if (dflt == NULL)
4646                        goto err_alloc_dflt;
4647        } else {
4648                /* these will be inherited by all namespaces */
4649                dflt->autoconf = ipv6_defaults.autoconf;
4650                dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4651        }
4652
4653        net->ipv6.devconf_all = all;
4654        net->ipv6.devconf_dflt = dflt;
4655
4656#ifdef CONFIG_SYSCTL
4657        err = __addrconf_sysctl_register(net, "all", NULL, all);
4658        if (err < 0)
4659                goto err_reg_all;
4660
4661        err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4662        if (err < 0)
4663                goto err_reg_dflt;
4664#endif
4665        return 0;
4666
4667#ifdef CONFIG_SYSCTL
4668err_reg_dflt:
4669        __addrconf_sysctl_unregister(all);
4670err_reg_all:
4671        kfree(dflt);
4672#endif
4673err_alloc_dflt:
4674        kfree(all);
4675err_alloc_all:
4676        return err;
4677}
4678
4679static void __net_exit addrconf_exit_net(struct net *net)
4680{
4681#ifdef CONFIG_SYSCTL
4682        __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4683        __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4684#endif
4685        if (!net_eq(net, &init_net)) {
4686                kfree(net->ipv6.devconf_dflt);
4687                kfree(net->ipv6.devconf_all);
4688        }
4689}
4690
4691static struct pernet_operations addrconf_ops = {
4692        .init = addrconf_init_net,
4693        .exit = addrconf_exit_net,
4694};
4695
4696/*
4697 *      Device notifier
4698 */
4699
4700int register_inet6addr_notifier(struct notifier_block *nb)
4701{
4702        return atomic_notifier_chain_register(&inet6addr_chain, nb);
4703}
4704EXPORT_SYMBOL(register_inet6addr_notifier);
4705
4706int unregister_inet6addr_notifier(struct notifier_block *nb)
4707{
4708        return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4709}
4710EXPORT_SYMBOL(unregister_inet6addr_notifier);
4711
4712static struct rtnl_af_ops inet6_ops = {
4713        .family           = AF_INET6,
4714        .fill_link_af     = inet6_fill_link_af,
4715        .get_link_af_size = inet6_get_link_af_size,
4716};
4717
4718/*
4719 *      Init / cleanup code
4720 */
4721
4722int __init addrconf_init(void)
4723{
4724        int i, err;
4725
4726        err = ipv6_addr_label_init();
4727        if (err < 0) {
4728                pr_crit("%s: cannot initialize default policy table: %d\n",
4729                        __func__, err);
4730                goto out;
4731        }
4732
4733        err = register_pernet_subsys(&addrconf_ops);
4734        if (err < 0)
4735                goto out_addrlabel;
4736
4737        /* The addrconf netdev notifier requires that loopback_dev
4738         * has it's ipv6 private information allocated and setup
4739         * before it can bring up and give link-local addresses
4740         * to other devices which are up.
4741         *
4742         * Unfortunately, loopback_dev is not necessarily the first
4743         * entry in the global dev_base list of net devices.  In fact,
4744         * it is likely to be the very last entry on that list.
4745         * So this causes the notifier registry below to try and
4746         * give link-local addresses to all devices besides loopback_dev
4747         * first, then loopback_dev, which cases all the non-loopback_dev
4748         * devices to fail to get a link-local address.
4749         *
4750         * So, as a temporary fix, allocate the ipv6 structure for
4751         * loopback_dev first by hand.
4752         * Longer term, all of the dependencies ipv6 has upon the loopback
4753         * device and it being up should be removed.
4754         */
4755        rtnl_lock();
4756        if (!ipv6_add_dev(init_net.loopback_dev))
4757                err = -ENOMEM;
4758        rtnl_unlock();
4759        if (err)
4760                goto errlo;
4761
4762        for (i = 0; i < IN6_ADDR_HSIZE; i++)
4763                INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4764
4765        register_netdevice_notifier(&ipv6_dev_notf);
4766
4767        addrconf_verify(0);
4768
4769        err = rtnl_af_register(&inet6_ops);
4770        if (err < 0)
4771                goto errout_af;
4772
4773        err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4774                              NULL);
4775        if (err < 0)
4776                goto errout;
4777
4778        /* Only the first call to __rtnl_register can fail */
4779        __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4780        __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4781        __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4782                        inet6_dump_ifaddr, NULL);
4783        __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4784                        inet6_dump_ifmcaddr, NULL);
4785        __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4786                        inet6_dump_ifacaddr, NULL);
4787
4788        ipv6_addr_label_rtnl_register();
4789
4790        return 0;
4791errout:
4792        rtnl_af_unregister(&inet6_ops);
4793errout_af:
4794        unregister_netdevice_notifier(&ipv6_dev_notf);
4795errlo:
4796        unregister_pernet_subsys(&addrconf_ops);
4797out_addrlabel:
4798        ipv6_addr_label_cleanup();
4799out:
4800        return err;
4801}
4802
4803void addrconf_cleanup(void)
4804{
4805        struct net_device *dev;
4806        int i;
4807
4808        unregister_netdevice_notifier(&ipv6_dev_notf);
4809        unregister_pernet_subsys(&addrconf_ops);
4810        ipv6_addr_label_cleanup();
4811
4812        rtnl_lock();
4813
4814        __rtnl_af_unregister(&inet6_ops);
4815
4816        /* clean dev list */
4817        for_each_netdev(&init_net, dev) {
4818                if (__in6_dev_get(dev) == NULL)
4819                        continue;
4820                addrconf_ifdown(dev, 1);
4821        }
4822        addrconf_ifdown(init_net.loopback_dev, 2);
4823
4824        /*
4825         *      Check hash table.
4826         */
4827        spin_lock_bh(&addrconf_hash_lock);
4828        for (i = 0; i < IN6_ADDR_HSIZE; i++)
4829                WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4830        spin_unlock_bh(&addrconf_hash_lock);
4831
4832        del_timer(&addr_chk_timer);
4833        rtnl_unlock();
4834}
4835
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